Compressor, refrigeration system, and method for manufacturing a compressor

Abstract

When thermal spraying piping outside the compressor casing, if the ends of the piping are masked with caps to prevent them from being sprayed, there is a risk that the spray material may penetrate between the cap and the piping during spraying and adhere to the ends. In addition, if water adheres to the edges of a thermal spray coating made of a different type of metal than the casing, there is a risk that galvanic corrosion of the thermal spray coating will progress. [Solution] The compressor 101 comprises a casing 10 and a discharge pipe 20. The discharge pipe 20 is fixed to the casing 10. The discharge pipe 20 has an outer surface 20b located outside the casing 10. A first groove 21 or a third step 22 surrounding the discharge pipe 20 is formed on the outer surface 20b of the discharge pipe 20. A portion of the outer surface 20b of the discharge pipe 20 is covered with a thermal spray coating 40 made of a different type of metal than the discharge pipe 20. The edge 40a of the thermal spray coating 40 is located inside the first groove 21 or between the third step 22 and the casing 10.

Description

Technical Field

[0001] It relates to a compressor, a refrigeration device, and a method for manufacturing a compressor.

Background Art

[0002] As described in Patent Document 1 (Japanese Patent Laid-Open No. 2002-303272), in a compressor of a refrigeration device used in a marine environment, a method of improving the corrosion resistance of a casing is used by forming a coating made of a different type of metal from the casing on the outer surface of the casing by thermal spraying.

Summary of the Invention

Problems to be Solved by the Invention

[0003] When thermal spraying the piping outside the casing, if the end of the piping is covered with a cap and masked so that the end is not thermally sprayed, there is a risk that the thermal spray material will penetrate between the cap and the piping during thermal spraying and adhere to the end. Also, if water adheres to the edge of the thermal spray coating made of a different type of metal from the casing, there is a risk that galvanic corrosion of the thermal spray coating will progress.

Means for Solving the Problems

[0004] The compressor according to the first aspect includes a casing and a metal component. The metal component is fixed to the casing. The metal component has an outer surface located outside the casing. A groove or step surrounding the metal component is formed on the outer surface of the metal component. A part of the outer surface of the metal component is covered with a thermal spray coating made of a different type of metal from the metal component. The edge of the thermal spray coating is located inside the groove or between the step and the casing.

[0005] The compressor according to the first aspect suppresses the thermal spray coating of the piping, which is a metal component, from reaching the connection part at the end of the piping, thereby suppressing a poor connection of the piping.

[0006] The compressor according to the second aspect is the compressor according to the first aspect, and the edge of the thermal spray coating is covered with a caulking material.

[0007] The second aspect of the compressor is that it suppresses galvanic corrosion of metal parts.

[0008] The compressor in the third view is the compressor in the second view, and the grooves or steps are covered with caulking material.

[0009] In the third aspect of the compressor, the edges of the thermal spray coating are covered with caulking material by covering grooves or steps with caulking material, thereby suppressing galvanic corrosion of metal parts.

[0010] The compressor in the fourth aspect is one of the compressors in the first to third aspects, and the thermal spray coating is an aluminum thermal spray coating.

[0011] The compressor of the fifth perspective is one of the compressors of the first to fourth perspectives, and the metal parts are made of stainless steel.

[0012] A compressor of the sixth aspect is a compressor of any one of the first to fifth aspects, further comprising a compression mechanism. The compression mechanism is housed in a casing. The compression mechanism has a compression chamber through which gas is compressed. The metal components include at least one of an intake pipe, a discharge pipe, and an injection pipe. The intake pipe carries the gas before it is compressed by the compression mechanism. The discharge pipe carries the gas after it has been compressed by the compression mechanism. The injection pipe carries the gas supplied to the compression chamber through which the gas is being compressed.

[0013] The sixth aspect of the compressor is that it suppresses poor connections in the piping, which is made of metal components.

[0014] The refrigeration system of the seventh aspect comprises one of the compressors of the first to sixth aspects.

[0015] The seventh aspect of the refrigeration system is to suppress faulty connections in the piping, which is made of metal components.

[0016] The eighth aspect of the method for manufacturing a compressor is a method for manufacturing a compressor comprising a casing and a metal component. The metal component is fixed to the casing. The metal component has an outer surface located outside the casing. The method for manufacturing the compressor includes a first step, a second step, and a third step. In the first step, a portion of the metal component is covered with a protective member. In the second step, a portion of the outer surface of the metal component is covered with a thermal spray coating made of a different type of metal than the metal component. In the third step, after removing the protective member from the metal component, the edges of the thermal spray coating are covered with a caulking material.

[0017] The eighth aspect of the compressor manufacturing method suppresses connection defects in metal piping and also suppresses galvanic corrosion of metal parts by covering the edges of the thermal spray coating with caulking material.

[0018] The method for manufacturing a compressor according to the ninth aspect is the method for manufacturing a compressor according to the eighth aspect, wherein a groove surrounding the metal part is formed on the outer surface of the metal part. In the first step, a portion of the groove is covered with a protective member. In the second step, a portion of the outer surface of the metal part is covered with a thermal spray coating such that the edge is located inside the groove. In the third step, after removing the protective member from the metal part, the groove is covered with a caulking material.

[0019] The manufacturing method of the compressor in the ninth perspective involves covering the grooves with caulking material and covering the edges of the thermal spray coating with caulking material to suppress galvanic corrosion of metal parts.

[0020] The method for manufacturing a compressor according to the tenth aspect is the method for manufacturing a compressor according to the eighth aspect, wherein a step is formed on the outer surface of a metal part, surrounding the metal part. In the first step, the step is covered with a protective member. In the second step, a portion of the outer surface of the metal part is covered with a thermal spray coating such that the edge is located between the step and the casing. In the third step, after removing the protective member from the metal part, the step and the edge are covered with a caulking material.

[0021] The manufacturing method of the compressor in the tenth perspective involves covering the steps with caulking material and covering the edges of the thermal spray coating with caulking material to suppress galvanic corrosion of metal parts.

Brief Description of the Drawings

[0022] [Figure 1] It is a refrigerant circuit diagram of the refrigeration device 1 of the first embodiment. [Figure 2] It is a front view of the compressor 101 of the first embodiment. [Figure 3] It is a flowchart of the assembly process of the compressor 101 of the first embodiment. [Figure 4] It is a flowchart of the thermal spraying process of FIG. 3. [Figure 5] It is a diagram for explaining the masking area. [Figure 6] It is a diagram for explaining the caulking process of FIG. 4. [Figure 7] It is an external view of the discharge pipe 20 of the second embodiment. [Figure 8] It is a diagram for explaining the masking process of the second embodiment. [Figure 9] It is an enlarged view of FIG. 8. [Figure 10] It is a diagram for explaining the caulking process of the second embodiment. [Figure 11] [ It is an external view of the discharge pipe 20 of the third embodiment. [Figure 12] It is a diagram for explaining the masking process of the third embodiment. [Figure 13] It is an enlarged view of FIG. 12. [Figure 14] It is a diagram for explaining the caulking process of the third embodiment. [Figure 15] It is an external view of the discharge pipe 20 of the fourth embodiment. [Figure 16] It is a diagram for explaining the masking process of the fourth embodiment. [Figure 17] It is an enlarged view of FIG. 16. [Figure 18] It is a diagram for explaining the caulking process of the fourth embodiment.

Modes for Carrying Out the Invention

[0023] —First Embodiment— (1) Overall configuration of the compressor The compressor 101 of the first embodiment is provided in a refrigeration system 1. The refrigeration system 1 is, for example, an air conditioning system. As shown in Figure 1, the refrigeration system 1 includes a refrigerant circuit 100 through which the refrigerant circulates. The refrigerant circuit 100 connects the compressor 101, a radiator 2, a pressure reducing mechanism 3, a heat absorber 4, and an economizer heat exchanger 5. The compressor 101 compresses the gaseous refrigerant flowing through the refrigerant circuit 100. The radiator 2 and the heat absorber 4 are heat exchangers. The radiator 2 and the heat absorber 4 perform, for example, heat exchange between the refrigerant and the outside air. The pressure reducing mechanism 3 reduces the pressure of the refrigerant flowing through the refrigerant circuit 100. The pressure reducing mechanism 3 is, for example, an electronic expansion valve. The refrigeration system 1 repeats a vapor compression type refrigeration cycle in which the refrigerant in the refrigerant circuit 100 is compressed, condensed (heat released), reduced in pressure, evaporated (heat absorbed), and then compressed again.

[0024] The economizer heat exchanger 5 is positioned between the radiator 2 and the pressure reducing mechanism 3. The economizer heat exchanger 5 performs heat exchange between the refrigerant flowing from the radiator 2 toward the pressure reducing mechanism 3 and the refrigerant flowing through the economizer piping 6. The economizer piping 6 branches off from the refrigerant circuit 100 between the economizer heat exchanger 5 and the pressure reducing mechanism 3. An economizer valve 7 is installed in the economizer piping 6. The refrigerant flowing through the economizer piping 6 is reduced in pressure by the economizer valve 7 before heat exchange takes place in the economizer heat exchanger 5, becoming refrigerant at an intermediate pressure. The intermediate pressure is the pressure between the pressure of the high-pressure refrigerant discharged from the compressor 101 and the pressure of the low-pressure refrigerant drawn into the compressor 101.

[0025] The type of compressor 101 is not limited. Compressor 101 is, for example, a scroll compressor or a rotary compressor. A scroll compressor compresses the refrigerant by changing the volume of the space formed by two scroll members having interlocking spiral wraps. A rotary compressor compresses the refrigerant by rotating a piston in a cylinder, thereby changing the volume of the space partitioned by the piston within the cylinder. Hereinafter, compressor 101 will be assumed to be a scroll compressor.

[0026] As shown in Figure 2, the compressor 101 includes a casing 10. The casing 10 is formed from a rigid member that is resistant to deformation and damage due to changes in pressure and temperature in the internal and external spaces of the casing 10. The material of the casing 10 is, for example, an iron-containing metal such as carbon steel or cast iron.

[0027] The casing 10 houses a compression mechanism, a motor, and a crankshaft, among other things. The compression mechanism is connected to the motor via the crankshaft. The motor rotates the crankshaft using power supplied from an external power source. The compression mechanism compresses the refrigerant by causing one of the two scroll members to revolve as the crankshaft rotates, thereby changing the space formed by the two scroll members.

[0028] The casing 10 consists of a body portion 11, an upper wall portion 12, and a bottom wall portion 13. The body portion 11 has a cylindrical shape. The upper wall portion 12 has a bowl shape. The bottom wall portion 13 has a bowl shape. The upper wall portion 12 is airtightly welded to the upper end of the body portion 11. The bottom wall portion 13 is airtightly welded to the lower end of the body portion 11. The casing 10 is installed so that its axial direction is aligned with the vertical direction. The vertical direction is the direction indicated by arrow U in Figure 2. The axial direction of the casing 10 is aligned with the central axis of the cylindrical shape of the body portion 11.

[0029] Hereinafter, the metal parts attached to the casing 10 will be simply referred to as "metal parts." The metal parts are attached to the outer surfaces of the body 11, the upper wall 12, and the bottom wall 13. The material of the metal parts is, for example, iron-containing metals such as carbon steel and cast iron, and stainless steel. Stainless steel is preferred as the material of the metal parts.

[0030] The type of metal parts is not limited. An example of metal parts shown in Figure 2 will be described. On the side of the body 11, a discharge pipe 20, a terminal guard 31, and a sensor mounting seat 34 are attached as metal parts. On the side of the upper wall 12, a suction pipe 19 and an injection pipe 35 are attached as metal parts. A hanging bracket 33 is attached as a metal part to the upper surface of the upper wall 12. A mounting leg 32 is attached as a metal part to the lower surface of the bottom wall 13.

[0031] The suction pipe 19 is a pipe for introducing refrigerant from the refrigerant circuit 100 to the compression mechanism from outside the casing 10. Refrigerant gas flows through the inside of the suction pipe 19 before it is compressed by the compression mechanism. The suction pipe 19 is airtightly fitted into the upper wall portion 12 of the casing 10.

[0032] The discharge pipe 20 is a pipe for discharging compressed refrigerant from the internal space of the casing 10 to the outside of the casing 10. The refrigerant gas, which has been compressed by the compression mechanism, flows through the inside of the discharge pipe 20. The discharge pipe 20 is airtightly fitted into the body portion 11 of the casing 10.

[0033] The terminal guard 31 is a component for protecting the terminal 41 connected to the motor inside the casing 10. The terminal 41 protrudes from the outer surface of the body 11. The terminal guard 31 is attached to the outer surface of the body 11 so as to surround the terminal 41.

[0034] The mounting legs 32 are components for fixing the compressor 101 to the mounting surface. The mounting legs 32 have bolt holes for fixing to the mounting surface with bolts, for example. When the compressor 101 is mounted on a shipping container or the like, it is preferable that the mounting legs 32 be fixed to the mounting surface via vibration-damping rubber in order to suppress the propagation of vibrations from the compressor 101 to the entire shipping container via the mounting legs 32.

[0035] The suspension fitting 33 is a component for suspending the compressor 101. The suspension fitting 33 has an annular portion for attaching, for example, a hook. The suspension fitting 33 is used to suspend the compressor 101 during assembly and transportation.

[0036] The sensor mounting base 34 is a component for attaching a temperature sensor or the like to the body 11. The temperature sensor is used, for example, to measure the temperature of the outer surface of the body 11 and to monitor the temperature of the refrigerant inside the compressor 101.

[0037] The injection tube 35 is a component for injecting refrigerant at an intermediate pressure into the compression mechanism to improve the efficiency of the refrigeration cycle. The injection tube 35 is connected to the economizer piping 6 of the refrigerant circuit 100. The refrigerant at an intermediate pressure, which is reduced in pressure by the economizer valve 7 and flows through the economizer piping 6, is supplied to the injection tube 35. The refrigerant gas at an intermediate pressure that is supplied to the compression chamber flows inside the injection tube 35. The compression chamber is a space inside the compression mechanism in which the refrigerant gas is compressed. In the case of a scroll compressor, the compression chamber is a space formed by two scroll members.

[0038] (2) Compressor assembly process The manufacturing method for the compressor 101 includes an assembly process for the compressor 101. The assembly process for the compressor 101 mainly includes a mounting process, a joining process, and a thermal spraying process, as shown in Figure 3.

[0039] In the installation process, metal parts (discharge pipe 20, terminal guard 31, and sensor mounting seat 34, etc.) are attached to the outer surface of the body 11 by welding or the like. In the installation process, metal parts (hanging bracket 33, suction pipe 19, and injection pipe 35, etc.) are attached to the outer surface of the upper wall 12 by welding or the like. In the installation process, metal parts (mounting legs 32, etc.) are attached to the outer surface of the bottom wall 13 by welding or the like. In the installation process, components to be housed inside the casing 10 (compression mechanism, motor, and crankshaft, etc.) are attached to the inside of the body 11, upper wall 12, and bottom wall 13 by press-fitting and welding or the like.

[0040] In the joining process, the upper wall portion 12 and the bottom wall portion 13 are joined to the body portion 11 to assemble the casing 10. In the joining process, first, the lower end of the body portion 11 is joined by welding to the upper end of the bottom wall portion 13, which is fixed to the installation surface. Next, in the joining process, the lower end of the upper wall portion 12 is joined by welding to the upper end of the body portion 11.

[0041] In the thermal spraying process, thermal spraying is applied to the casing 10 and the metal parts. Thermal spraying is a surface treatment method in which a thermal spray material, which has been atomized by heating, is sprayed onto the surface of the object to be treated, thereby forming a coating of the thermal spray material on the surface of the object to be treated. Hereinafter, the coating formed by thermal spraying will be called the thermal spray coating. In the thermal spraying process, a metallic thermal spray coating is formed on the surface of the object to be treated by applying thermal spraying using a metallic thermal spray material. In the thermal spraying process, a thermal spray coating is formed on the outer surface of the casing 10. In the thermal spraying process, a thermal spray coating is formed on the outer surface of the metal parts. The outer surface of the metal parts is the surface of the metal parts that is exposed to the external space of the casing 10.

[0042] In the thermal spraying process, predetermined areas of the outer surface of the casing 10 and the outer surface of the metal parts are masked before thermal spraying is performed. The masked areas are areas where thermal spraying is prohibited. Areas where thermal spraying is prohibited include, for example, surfaces that have already been thermal sprayed and surfaces that are connected to external parts. A thermal spray coating will not be formed on surfaces that are masked before thermal spraying is performed during the thermal spraying process. After the thermal spray coating is formed, the masking is removed.

[0043] (3) Thermal spraying process The thermal spraying process will be explained in detail. Figure 4 is a flowchart of the thermal spraying process. The thermal spraying process mainly consists of degreasing, masking, blasting, preheating, thermal spray coating formation, sealing, painting, inspection, and caulking. In the following, the surface on which the thermal spray coating is formed will be referred to as the treated surface. The treated surface includes the outer surface of the casing 10 and the outer surface of the metal parts.

[0044] (3-1) Degreasing treatment Degreasing is a process that removes contaminants such as oil adhering to the surface to be treated. Degreasing is performed to prevent the surface to be treated from rusting due to contaminants before thermal spraying. Degreasing is also performed to remove rust-preventive oil that has been pre-applied to the surface to be treated, as well as contaminants adhering to the surface to be treated. If it is necessary to transport the compressor 101 after assembling it by joining the upper wall portion 12 and the bottom wall portion 13 to the body portion 11, it may take some time before the blasting process can begin. In this case, there is a risk that the surface to be treated may rust due to contaminants during the transport of the compressor 101. If rust, rust-preventive oil, and other contaminants are present on the surface to be treated when the thermal spray coating is formed, the adhesion of the thermal spray coating will decrease, causing a decrease in the corrosion resistance of the surface to be treated. Also, if rust-preventive oil has been pre-applied to the surface to be treated for rust prevention, and the rust-preventive oil remains on the surface to be treated when the thermal spray coating is formed, the adhesion of the thermal spray coating will decrease, causing a decrease in the corrosion resistance of the surface to be treated. Therefore, it is necessary to completely remove contaminants from the surface to be treated before starting the blasting process.

[0045] (3-2) Masking process The masking process (first step) is a process to protect the masking area, which is the part where the thermal spray coating should not be formed. The masking area corresponds to the "parts where thermal spraying is prohibited" mentioned above. The masking area includes surfaces that have already been thermal sprayed and surfaces that are connected to external parts.

[0046] In Figure 5, examples of masking areas are shown as hatched areas. The parts to be masked are the end of the suction pipe 19, the end of the discharge pipe 20, the bolt holes of the mounting leg 32, the end of the sensor mounting seat 34, the end of the injection pipe 35, and the terminal 41.

[0047] In the masking process, the masking area is covered with masking fixtures such as heat-resistant masking tape and heat-resistant masking caps. The heat-resistant masking tape is applied to the masking area, which has a substantially smooth surface. The heat-resistant masking caps are placed over the masking area that protrudes from the surface. For example, the heat-resistant masking caps are placed over the ends of the suction pipe 19 and the ends of the discharge pipe 20.

[0048] (3-3) Blasting Blasting is a process that roughens the surface to be treated and removes oxide scale adhering to the surface. The entire surface to which the thermal spray coating is formed is subjected to blasting. Blasting is performed to improve the adhesion of the thermal spray coating to the surface. The thermal spray coating adheres mechanically to the surface through an anchoring effect. Therefore, if the surface roughness of the surface is too low, or if contaminants such as oxide scale are adhering to the surface, the thermal spray coating may easily peel off the surface.

[0049] In blasting, powdered abrasive materials made of iron and aluminum oxide are sprayed onto the surface to be treated, roughening the surface and removing oxide scale and other contaminants adhering to it. To achieve high adhesion between the thermal spray coating and the treated surface, the shape and cleanliness of the treated surface after blasting are important. Therefore, grid blasting, which uses abrasive materials with sharp angles, is preferable to shot blasting, which uses spherical abrasive materials. Grid blasting tends to create a treated surface with sharper angles and higher surface roughness compared to shot blasting. The greater the degree of sharpness of the treated surface, the larger the surface area of ​​the treated surface. A larger surface area of ​​the treated surface increases the contact area between the treated surface and the thermal spray coating, thus improving the adhesion of the thermal spray coating to the treated surface. Furthermore, contaminants such as oxide scale adhering to the treated surface reduce the adhesion of the thermal spray coating and can cause the thermal spray coating to peel off. Therefore, a higher level of cleanliness of the treated surface after blasting is preferable. In grid blasting, contaminants adhering to the treated surface are removed more easily compared to shot blasting.

[0050] Furthermore, the abrasive material used in blasting is preferably a highly hard substance such as aluminum oxide. This is because the higher the hardness of the abrasive material, the higher the surface area and cleanliness of the treated surface after blasting, and the better the adhesion of the thermal spray coating to the treated surface tends to be.

[0051] Furthermore, the casing 10 is formed from various materials with different hardnesses, such as steel, stainless steel, cast iron, and brass. Therefore, it is preferable that the blast treatment conditions be set according to the material of the casing 10 so that a good shape, surface roughness, and cleanliness can be obtained on the entire outer surface of the casing 10.

[0052] (3-4) Preheating Preheating is a process of heating the surface to be treated before forming a thermal spray coating on it. Preheating is performed to improve the adhesion of the thermal spray coating to the surface to be treated. If water and contaminants adhere to the surface to be treated when the thermal spray coating is formed, it will cause a decrease in the adhesion between the thermal spray coating and the surface to be treated. Therefore, it is desirable to preheat the surface to be treated before forming the thermal spray coating in order to remove any water and contaminants adhering to the surface to be treated. In order to suppress the deterioration of the components housed inside the casing 10 (compression mechanism, motor and crankshaft, etc.) and the refrigeration oil, it is preferable that the preheating is performed so that the temperature of the surface to be treated does not exceed 150°.

[0053] (3-5) Thermal spray coating process The thermal spray coating process (second step) is a process in which a metallic thermal spray coating is formed on the surface to be treated by thermal spraying. The thermal spray material used in the thermal spray coating process is a metal. The material of the thermal spray material is a different type of metal from the material of the surface to be treated. When the compressor 101 is used in a refrigeration system attached to a shipping container, the thermal spray material is preferably aluminum, magnesium, zinc, or an alloy of any of these. When the metal part having the treated surface is made of stainless steel, the thermal spray material is preferably aluminum. Depending on the thermal spray material, an appropriate thermal spraying method is selected from flame spraying, arc spraying, plasma spraying, etc.

[0054] The thickness of the thermal spray coating is set to an appropriate value to prevent cracking of the thermal spray coating due to internal stress and thermal expansion, depending on the corrosion resistance required for the treated surface, the range of temperature changes on the treated surface that occur during the operation of the compressor 101, and the shape of the compressor 101. Since the thickness of the thermal spray coating tends to be thinner at the edges of the outer surface of the casing 10, it is preferable to chamfer the edges in advance.

[0055] The time between blasting and thermal spray coating is preferably 4 hours or less. This is because the longer the time between blasting and thermal spray coating, the lower the activity of the treated surface may become, or moisture or other substances may adhere to the treated surface, potentially reducing the adhesion of the thermal spray coating to the treated surface.

[0056] After the thermal spray coating process is complete, the masking fixtures covering the masked areas are removed. Specifically, the heat-resistant masking tape is peeled off from the masked areas, which have a substantially smooth surface. In addition, the heat-resistant masking caps are removed from the masked areas that protrude from the surface. For example, the heat-resistant masking caps are removed from the ends of the suction pipe 19 and the discharge pipe 20.

[0057] (3-6) Sealing treatment The sealing treatment is a process that closes the voids in the thermal spray coating formed on the treated surface. These voids in the thermal spray coating cause a decrease in the corrosion resistance of the treated surface due to exposure to the outside air. Therefore, the sealing treatment is performed to suppress the decrease in the corrosion resistance of the treated surface. In the sealing treatment, a sealing agent is applied to the treated surface on which the thermal spray coating has been formed.

[0058] The sealing treatment should be performed on the same day that the thermal spray coating is formed. This is because the longer the time between the thermal spray coating and the sealing treatment, the more water and contaminants will adhere to the thermal spray coating, making it difficult for the sealing agent to penetrate the coating, and potentially resulting in the required corrosion resistance not being achieved on the treated surface.

[0059] There are various types of sealing agents, including silicone resins, acrylic resins, epoxy resins, urethane resins, and fluororesins. However, an appropriate sealing agent should be selected for the application and operating environment of the compressor 101, taking into account factors such as UV resistance, water resistance, moisture permeability, water repellency, coefficient of thermal expansion, and ease of penetration into the thermal spray coating.

[0060] The sealing agent can be applied using methods similar to those used for normal painting of the outer surface of the casing 10, such as brush application, spray application, and immersion in a sealing agent bath. Before applying the sealing agent, it is desirable to preheat the treated surface on which the thermal spray coating has been formed to remove water and contaminants that may cause a decrease in the adhesion of the sealing agent.

[0061] The film thickness of the sealing agent applied to the treated surface is set to an appropriate value in accordance with the required corrosion resistance of the treated surface, the range of temperature changes on the treated surface during operation of the compressor 101, and the shape of the compressor 101, so as to prevent cracking of the thermal spray coating due to internal stress and thermal expansion.

[0062] (3-7) Painting process Painting is a process that improves the appearance of a surface treated with a thermal spray coating by applying paint or other coatings. The coating used in this process should preferably have good adhesion to the thermal spray coating.

[0063] (3-8) Inspection process The inspection process involves inspecting the treated surface to which the thermal spray coating has been formed. Specifically, the inspection process measures the adhesion strength of the thermal spray coating to the treated surface and the thickness of the thermal spray coating, and determines whether the measured values ​​meet the prescribed requirements.

[0064] To accurately measure the adhesion and film thickness of the thermal spray coating, it is preferable to perform the measurement on a portion of the outer surface of the casing 10 that is substantially free of irregularities. Therefore, it is preferable to pre-form a surface on the casing 10 for measuring the adhesion and film thickness of the thermal spray coating.

[0065] Alternatively, instead of measuring the adhesion strength and film thickness of the thermal spray coating formed on the outer surface of the casing 10, the adhesion strength and film thickness of the thermal spray coating formed on the surface of the masking jig used in the masking process may be measured. In this case, it is preferable that the material of the masking jig is the same as or similar to the material of the casing 10.

[0066] (3-9) Caulking treatment The caulking process (third step) involves applying caulk to the treated surface on which the thermal spray coating has been formed. Specifically, in the caulking process, caulking material is applied to the edges of the thermal spray coating. The caulking material is, for example, a silicone-based caulking material manufactured from silicone resin.

[0067] The caulking process for the metal discharge pipe 20 is described below. Figure 6 is an external view of the discharge pipe 20 with caulking material 70 applied. Figure 6 shows the weld bead 60 formed when the discharge pipe 20 is attached to the body 11 by welding. Figure 6 shows the longitudinal cross-sectional shape of the weld bead 60 and the thermal spray coating 40. The thermal spray coating 40 is shown thicker than it actually is for emphasis.

[0068] The end 20a of the discharge pipe 20 is the portion connected to the refrigerant piping of the refrigerant circuit 100 and includes a portion where threads are formed. The outer surface 20b of the discharge pipe 20 includes a treated surface. A thermal spray coating 40 is formed on the outer surface 20b of the discharge pipe 20 by a thermal spray coating formation process. The thermal spray coating 40 is integrally formed on the outer surface 11a of the body portion 11, the surface of the weld bead 60, and the outer surface 20b of the discharge pipe 20. The edge 40a of the thermal spray coating 40 is located on the outer surface 20b of the discharge pipe 20. In the longitudinal direction of the discharge pipe 20, the edge 40a of the thermal spray coating 40 is located between the end 20a of the discharge pipe 20 and the outer surface 11a of the body portion 11.

[0069] As shown in Figure 6, the caulking material 70 is applied to cover the edge 40a of the thermal spray coating 40. After applying the caulking material, it is necessary to allow it to dry until it hardens. Before applying the caulking material, the area around the surface to be coated may be covered with masking tape. The masking tape prevents the caulking material from adhering to the outer surface 20b of the discharge pipe 20.

[0070] (4) Effects Compressors used in refrigeration systems have a casing composed of multiple components formed from metals such as carbon steel and cast iron. The outer surface of the compressor casing is treated to suppress damage from rust and improve corrosion resistance. The corrosion resistance of the casing is an important characteristic for extending the product life of the compressor. In particular, compressor casings used in marine environments are easily exposed to spray and fog containing seawater components and are susceptible to rapid temperature changes, so high corrosion resistance is required. Compressors used in marine environments are, for example, compressors used in refrigeration systems for shipping containers that are loaded onto container ships and transported across the ocean.

[0071] In compressors used in household air conditioners and the like, a coating of paint and resin is sometimes applied to the outer surface of the casing to improve corrosion resistance. However, such coatings are vulnerable to temperature changes, moisture penetration at the interface, and physical impact. Therefore, depending on the operating environment, the coating may crack or peel off from the casing's base material surface. In the case of compressors used in marine environments, if the casing's base material is exposed to the outside air due to cracking or peeling of the coating, corrosion of the casing becomes extremely likely. Furthermore, if the compressor is damaged due to casing corrosion, repair of the compressor is generally difficult in marine environments, which can result in significant economic losses. Therefore, compressor casings used in marine environments require particularly high corrosion resistance to salt.

[0072] Conventionally, in compressors used in marine environments, a method has been employed to improve the corrosion resistance of the casing by forming a metal coating on the outer surface of the casing by thermal spraying. In the case of thermal spraying of compressor casings, a metal with a higher ionization tendency than the main component of the casing material is used as the thermal spray material. In this case, the thermal spray coating, which is a metal coating formed by thermal spraying, is more susceptible to corrosion than the casing base material, thus having the effect of suppressing corrosion and damage to the casing due to rust. Furthermore, thermal spray coatings have higher adhesion to the base material and higher durability against temperature changes and physical impacts compared to coatings made by painting. Therefore, the outer surface of the casing on which the thermal spray coating is formed is less likely to be exposed to the outside air due to cracking and peeling of the coating.

[0073] The compressor 101 of the first embodiment includes a metal part that protrudes from the outer surface of the body 11 of the casing 10. To improve the corrosion resistance of the compressor 101, a thermal spray coating of metal is formed on the outer surface of the casing 10 and the outer surface of the metal part. As the thermal spray material for forming the thermal spray coating, a metal (aluminum) with a higher ionization tendency than the material of the metal part (metals containing iron such as carbon steel and cast iron, and stainless steel) is used. In this case, the thermal spray coating is corroded preferentially over the metal part which is the base material. Therefore, as long as the thermal spray coating does not peel off from the base material, the corrosion prevention effect that suppresses corrosion and damage to the base material due to rust is maintained.

[0074] In the first embodiment, the edges 40a of the thermal spray coating 40 formed on the treated surface of a metal part are covered with a caulking material 70. If the edges 40a of the thermal spray coating 40 are not covered with the caulking material 70 and are exposed to the outside air, galvanic corrosion of the thermal spray coating 40 will progress if water adheres to the edges 40a. Galvanic corrosion of the thermal spray coating 40 acts as sacrificial corrosion protection and has the effect of suppressing corrosion of the metal part. However, if the galvanic corrosion of the thermal spray coating 40 progresses excessively, the appearance of the metal part may deteriorate and the lifespan of the thermal spray coating 40 may be reduced.

[0075] In the first embodiment, the edges 40a of the thermal spray coating 40 are covered with caulking material 70, thereby suppressing electrolytic corrosion of the thermal spray coating 40. Consequently, the compressor 101 suppresses deterioration of the appearance of metal parts and a reduction in the lifespan of the thermal spray coating 40.

[0076] Furthermore, since the caulking material 70 has higher thermal insulation performance compared to the metal parts and the thermal spray coating 40, condensation is suppressed from adhering to the surface of the caulking material 70. As a result, water is suppressed from adhering to the metal parts and the thermal spray coating 40 surrounding the caulking material 70. Consequently, the compressor 101 suppresses corrosion of the metal parts and the thermal spray coating 40.

[0077] —Second Embodiment— The basic configuration and operation of the compressor 101 of the second embodiment are the same as those of the compressor 101 of the first embodiment. The main differences between the compressor 101 of the second embodiment and the compressor 101 of the first embodiment are the shape of the discharge pipe 20, which is a metal component, the masking treatment, the thermal spray coating treatment, and the caulking treatment.

[0078] (1)Discharge pipe 20 As shown in Figure 7, a first groove 21 surrounding the discharge pipe 20 is formed on the outer surface 20b of the discharge pipe 20 in the second embodiment. The first groove 21 includes a first step 21a, a second step 21b, and a recess 21c. The first step 21a and the second step 21b are locations in the longitudinal direction of the discharge pipe 20 where the outer diameter of the discharge pipe 20 changes. The first step 21a is located on the side of the end 20a of the discharge pipe 20. The second step 21b is located on the side of the body 11 of the casing 10. The recess 21c is the outer surface between the first step 21a and the second step 21b in the longitudinal direction of the discharge pipe 20. The outer diameter of the discharge pipe 20 in the recess 21c is smaller than the outer diameter of the discharge pipe 20 in the portion excluding the recess 21c.

[0079] (2) Thermal spraying process (2-1) Masking process Figures 8 and 9 show the state in which a heat-resistant masking cap 50 is placed over the end 20a of the discharge pipe 20 in the second embodiment. Figures 8 and 9 also show the cross-sectional shape of the heat-resistant masking cap 50.

[0080] As shown in Figure 9, the heat-resistant masking cap 50 has an end face 50a which is the surface facing the recess 21c of the first groove 21. The end face 50a surrounds the outer surface 20b of the discharge pipe 20. This allows the heat-resistant masking cap 50 to cover the portion of the first groove 21 that is on the end 20a side. The distance L1 between the end face 50a and the recess 21c is shorter than the vertical dimension L2 of the first step 21a and the vertical dimension L3 of the second step 21b.

[0081] In the masking process, the heat-resistant masking cap 50 is attached to the end 20a of the discharge pipe 20 such that the entire end face 50a faces the recess 21c of the first groove 21. The end face 50a of the heat-resistant masking cap 50 is inserted into the first groove 21 of the discharge pipe 20 and covers a portion of the first groove 21.

[0082] (2-2) Thermal spray coating process Figure 8 shows the longitudinal cross-sectional shape of the thermal spray coating 40 formed on the outer surface 20b of the discharge pipe 20 after the thermal spray coating formation process is completed. As shown in Figure 8, during the thermal spray coating formation process, a portion of the outer surface 20b is covered with the thermal spray coating 40 such that the edge 40a of the thermal spray coating 40 is located inside the first groove 21 of the discharge pipe 20. Therefore, in the longitudinal direction of the discharge pipe 20, the edge 40a of the thermal spray coating 40 is located in the recess 21c of the first groove 21.

[0083] After the thermal spray coating process is completed, the heat-resistant masking cap 50 is removed from the end 20a of the discharge pipe 20.

[0084] (2-3) Caulking treatment During the caulking process, the first groove 21 of the discharge pipe 20 and the edge 40a of the thermal spray coating 40 are covered with caulking material 70. As shown in Figure 10, the caulking material 70 covers the first step 21a, the second step 21b, and the recess 21c. The edge 40a of the thermal spray coating 40 is located in the recess 21c. Therefore, after the caulking process is completed, the edge 40a of the thermal spray coating 40 is covered with caulking material 70.

[0085] (3) Effects In the compressor 101 of the second embodiment, after the discharge pipe 20, which is a metal component, is attached to the body 11, the end 20a of the discharge pipe 20 is masked with a heat-resistant masking cap 50. Masking with the heat-resistant masking cap 50 prevents the formation of a thermal spray coating 40 on the end 20a of the discharge pipe 20. If a thermal spray coating 40 is formed on the end 20a, there is a risk of poor connection between the discharge pipe 20 and the refrigerant piping of the refrigerant circuit 100.

[0086] In the second embodiment, a first groove 21 is formed on the outer surface 20b of the discharge pipe 20. The heat-resistant masking cap 50 covers the end 20a of the discharge pipe 20 such that its end face 50a fits inside the first groove 21. Therefore, when spraying thermal spray material onto the outer surface 20b of the discharge pipe 20 to form a thermal spray coating 40, the intrusion of thermal spray material into the heat-resistant masking cap 50 through the masking gap 50b shown in Figure 9 is suppressed. The masking gap 50b is the space between the end face 50a of the heat-resistant masking cap 50 and the recess 21c of the first groove 21. If thermal spray material enters through the masking gap 50b, there is a risk that the thermal spray coating 40 will be formed on the end 20a.

[0087] Therefore, the compressor 101 suppresses the occurrence of poor connections between metal parts such as the discharge pipe 20 and external components.

[0088] Furthermore, by covering the first groove 21 of the discharge pipe 20 with the caulking material 70, the edge 40a of the thermal spray coating 40 is covered with the caulking material 70, thereby suppressing electrolytic corrosion of the thermal spray coating 40. Therefore, similar to the first embodiment, the compressor 101 suppresses deterioration of the appearance of metal parts and a reduction in the lifespan of the thermal spray coating 40.

[0089] —Third Embodiment— The basic configuration and operation of the compressor 101 of the third embodiment are the same as those of the compressor 101 of the first embodiment. The main differences between the compressor 101 of the third embodiment and the compressor 101 of the first embodiment are the shape of the discharge pipe 20, which is a metal component, the masking treatment, the thermal spray coating treatment, and the caulking treatment.

[0090] (1)Discharge pipe 20 As shown in Figure 11, a third step 22 is formed on the outer surface 20b of the discharge pipe 20 in the third embodiment, surrounding the discharge pipe 20. The third step 22 is a point in the longitudinal direction of the discharge pipe 20 where the outer diameter of the discharge pipe 20 changes. The outer diameter of the discharge pipe 20 on the end 20a side of the third step 22 is larger than the outer diameter of the discharge pipe 20 on the body 11 side of the third step 22.

[0091] (2) Thermal spraying process (2-1) Masking process Figures 12 and 13 show the state in which a heat-resistant masking cap 50 is placed over the end 20a of the discharge pipe 20 in the third embodiment. Figures 12 and 13 also show the cross-sectional shape of the heat-resistant masking cap 50.

[0092] As shown in Figure 13, the heat-resistant masking cap 50 has an end face 50a that faces the outer surface 20b on the body portion 11 side of the third step 22. The end face 50a surrounds the outer surface 20b of the discharge pipe 20. This allows the heat-resistant masking cap 50 to cover the portion on the end 20a side of the third step 22. The distance L4 between the end face 50a and the outer surface 20b is shorter than the vertical dimension L5 of the third step 22.

[0093] In the masking process, the heat-resistant masking cap 50 is attached to the end 20a of the discharge pipe 20 so as to cover the third step 22. In the longitudinal direction of the discharge pipe 20, it is preferable that the end face 50a of the heat-resistant masking cap 50 is located near the third step 22. For example, as shown in Figure 13, in the longitudinal direction of the discharge pipe 20, it is preferable that the distance L6 between the edge of the end face 50a and the third step 22 is shorter than the distance L4.

[0094] (2-2) Thermal spray coating process Figure 12 shows the longitudinal cross-sectional shape of the thermal spray coating 40 formed on the outer surface 20b of the discharge pipe 20 after the thermal spray coating formation process is completed. During the thermal spray coating formation process, a portion of the outer surface 20b is covered with the thermal spray coating 40 such that the edge 40a of the thermal spray coating 40 is located between the third step 22 and the body portion 11. As shown in Figure 12, during the thermal spray coating formation process, a portion of the outer surface 20b is covered with the thermal spray coating 40 such that the edge 40a of the thermal spray coating 40 is located near the third step 22. Specifically, as shown in Figure 14, in the longitudinal direction of the discharge pipe 20, the distance L7 between the third step 22 and the edge 40a is shorter than the distance L8 between the outer surface 11a of the body portion 11 and the edge 40a.

[0095] After the thermal spray coating process is completed, the heat-resistant masking cap 50 is removed from the end 20a of the discharge pipe 20.

[0096] (2-3) Caulking treatment During the caulking process, the third step 22 of the discharge pipe 20 and the edge 40a of the thermal spray coating 40 are covered with caulking material 70. As shown in Figure 14, the caulking material 70 covers the third step 22 and a portion of the outer surface 20b. The outer surface 20b covered by the caulking material 70 is located in the longitudinal direction of the discharge pipe 20, from the third step 22 to a predetermined position. The predetermined position is located in the longitudinal direction of the discharge pipe 20, between the edge 40a of the thermal spray coating 40 and the outer surface 11a of the body 11. Therefore, after the caulking process is completed, the edge 40a of the thermal spray coating 40 is covered with caulking material 70.

[0097] (3) Effects In the third embodiment, a third step 22 is formed on the outer surface 20b of the discharge pipe 20. The heat-resistant masking cap 50 covers the end 20a of the discharge pipe 20 so that the third step 22 is inside the heat-resistant masking cap 50. Therefore, when spraying thermal spray material onto the outer surface 20b of the discharge pipe 20 to form a thermal spray coating 40, the intrusion of thermal spray material into the heat-resistant masking cap 50 through the masking gap 50b shown in Figure 13 is suppressed. The masking gap 50b is the space between the end face 50a of the heat-resistant masking cap 50 and the outer surface 20b of the discharge pipe 20. If thermal spray material intrudes through the masking gap 50b, there is a risk that the thermal spray coating 40 will be formed on the end 20a.

[0098] Therefore, the compressor 101 suppresses the occurrence of poor connections between metal parts such as the discharge pipe 20 and external components.

[0099] Furthermore, by covering the third step 22 of the discharge pipe 20 with the caulking material 70, the edge 40a of the thermal spray coating 40 is covered with the caulking material 70, thereby suppressing electrolytic corrosion of the thermal spray coating 40. Therefore, similar to the first embodiment, the compressor 101 suppresses deterioration of the appearance of metal parts and a reduction in the lifespan of the thermal spray coating 40.

[0100] —Fourth Embodiment— The basic configuration and operation of the compressor 101 of the fourth embodiment are the same as those of the compressor 101 of the first embodiment. The main differences between the compressor 101 of the fourth embodiment and the compressor 101 of the first embodiment are the shape of the discharge pipe 20, which is a metal component, the masking treatment, the thermal spray coating treatment, and the caulking treatment.

[0101] (1)Discharge pipe 20 As shown in Figure 15, a second groove 23 surrounding the discharge pipe 20 is formed on the outer surface 20b of the discharge pipe 20 in the fourth embodiment. The second groove 23 includes a first slope 23a and a second slope 23b. The first slope 23a and the second slope 23b are locations along the longitudinal direction of the discharge pipe 20 where the outer diameter of the discharge pipe 20 gradually changes. The first slope 23a is located on the side of the end 20a of the discharge pipe 20. The second slope 23b is located on the side of the body 11 of the casing 10. The first slope 23a is the surface where the outer diameter of the discharge pipe 20 gradually decreases from the end 20a toward the body 11. The second slope 23b is the surface where the outer diameter of the discharge pipe 20 gradually increases from the end 20a toward the body 11.

[0102] (2) Thermal spraying process (2-1) Masking process Figures 16 and 17 show the state in which a heat-resistant masking cap 50 is placed over the end 20a of the discharge pipe 20 in the fourth embodiment. Figures 16 and 17 also show the cross-sectional shape of the heat-resistant masking cap 50.

[0103] As shown in Figure 17, the heat-resistant masking cap 50 has an end face 50a which is the surface facing the first bevel 23a and / or second bevel 23b of the second groove 23. The end face 50a surrounds the outer surface 20b of the discharge pipe 20. This allows the heat-resistant masking cap 50 to cover the portion of the second groove 23 on the end 20a side. The maximum distance L9 between the end face 50a and the first bevel 23a or the second bevel 23b is shorter than the vertical dimension L10 of the first bevel 23a and the vertical dimension L11 of the second bevel 23b.

[0104] In the masking process, the heat-resistant masking cap 50 is attached to the end 20a of the discharge pipe 20 such that the entire end face 50a faces the first bevel 23a and / or the second bevel 23b. The end face 50a of the heat-resistant masking cap 50 fits inside the second groove 23 of the discharge pipe 20 and covers a portion of the second groove 23.

[0105] (2-2) Thermal spray coating process Figure 16 shows the longitudinal cross-sectional shape of the thermal spray coating 40 formed on the outer surface 20b of the discharge pipe 20 after the thermal spray coating formation process is completed. As shown in Figure 16, during the thermal spray coating formation process, a portion of the outer surface 20b is covered with the thermal spray coating 40 such that the edge 40a of the thermal spray coating 40 is located inside the second groove 23 of the discharge pipe 20. Therefore, in the longitudinal direction of the discharge pipe 20, the edge 40a of the thermal spray coating 40 is located on the first slope 23a or the second slope 23b of the second groove 23.

[0106] After the thermal spray coating process is completed, the heat-resistant masking cap 50 is removed from the end 20a of the discharge pipe 20.

[0107] (2-3) Caulking treatment During the caulking process, the second groove 23 of the discharge pipe 20 and the edge 40a of the thermal spray coating 40 are covered with caulking material 70. As shown in Figure 18, the caulking material 70 covers the first slope 23a and the second slope 23b. The edge 40a of the thermal spray coating 40 is located on the first slope 23a and / or the second slope 23b. Therefore, after the caulking process is completed, the edge 40a of the thermal spray coating 40 is covered with caulking material 70.

[0108] (3) Effects In the fourth embodiment, a second groove 23 is formed on the outer surface 20b of the discharge pipe 20. The heat-resistant masking cap 50 covers the end 20a of the discharge pipe 20 such that its end face 50a fits inside the second groove 23. Therefore, when spraying thermal spray material onto the outer surface 20b of the discharge pipe 20 to form a thermal spray coating 40, the intrusion of thermal spray material into the heat-resistant masking cap 50 through the masking gap 50b shown in Figure 17 is suppressed. The masking gap 50b is the space between the end face 50a of the heat-resistant masking cap 50 and the first inclined surface 23a and / or the second inclined surface 23b of the second groove 23. If thermal spray material enters through the masking gap 50b, there is a risk that the thermal spray coating 40 will be formed on the end 20a.

[0109] Therefore, the compressor 101 suppresses the occurrence of poor connections between metal parts such as the discharge pipe 20 and external components.

[0110] Furthermore, by covering the second groove 23 of the discharge pipe 20 with the caulking material 70, the edge 40a of the thermal spray coating 40 is covered with the caulking material 70, thereby suppressing electrolytic corrosion of the thermal spray coating 40. Therefore, similar to the first embodiment, the compressor 101 suppresses deterioration of the appearance of metal parts and a reduction in the lifespan of the thermal spray coating 40.

[0111] —Revised Version— (1) Variation A The embodiment describes the case where the metal component is a discharge pipe 20. However, the embodiment can also be applied to other metal components besides the discharge pipe 20. For example, the embodiment can also be applied when the metal components are a suction pipe 19 and an injection pipe 35.

[0112] (2) Modification B In the second embodiment, the first groove 21 formed on the outer surface 20b of the discharge pipe 20 includes a first step 21a, a second step 21b, and a recess 21c. The first step 21a and / or the second step 21b may be surfaces along the longitudinal direction of the discharge pipe 20 in which the outer diameter of the discharge pipe 20 gradually changes. In other words, the first step 21a and the second step 21b may be surfaces such as the first slope 23a and the second slope 23b of the fourth embodiment, respectively.

[0113] (3) Variation C In the third embodiment, the third step 22 formed on the outer surface 20b of the discharge pipe 20 may be a surface in which the outer diameter of the discharge pipe 20 gradually changes along the longitudinal direction of the discharge pipe 20. In other words, the third step 22 may be a surface such as the first slope 23a in the fourth embodiment.

[0114] (4) Modification D In this embodiment, a degreasing treatment is performed to remove contaminants adhering to the surface to be treated before thermal spraying. However, instead of degreasing, a simple rust prevention treatment may be performed by applying paint to the surface to be treated before thermal spraying. In this case, it is preferable to select a paint that can be easily removed from the surface when the surface is blast-treated.

[0115] (5) Variation E In this embodiment, a blast treatment is performed to roughen the surface by grid blasting. However, instead of roughening the surface by grid blasting, the surface may be roughened by applying a surface roughening agent to the surface.

[0116] (6) Modification F In this embodiment, a thermal spray coating is formed using aluminum, magnesium, zinc, or an alloy composed of any of these as the thermal spray material. However, ceramics or a mixture of metal and ceramics may also be used as the thermal spray material. A thermal spray coating formed with such a ceramic-based thermal spray material has high performance in shielding the treated surface from the external environment and improves the corrosion resistance of the treated surface.

[0117] (7) Variation G In this embodiment, a thermal spray coating process is performed to form a thermal spray coating on the treated surface. However, the thermal spray coating does not need to be a single layer; a thermal spray coating consisting of multiple layers may be formed on the treated surface. For example, a thermal spray coating made of aluminum, magnesium, zinc, or an alloy of any of these may be formed on the treated surface, and another thermal spray coating made of ceramics or a mixture of metal and ceramics may be further formed on top of that thermal spray coating. A thermal spray coating consisting of multiple layers has a higher ability to isolate the treated surface from the external environment compared to a single-layer thermal spray coating, and the corrosion resistance of the treated surface is improved.

[0118] (8) Modification H In this embodiment, a sealing treatment is performed to close the voids in the thermal spray coating formed on the treated surface. In the sealing treatment, a resin-based sealing agent is applied to the treated surface on which the thermal spray coating is formed. However, a sealing agent containing metal flakes may also be used in the sealing treatment. In this case, the so-called labyrinth effect reduces the moisture permeability of the thermal spray coating, thereby effectively suppressing the decrease in the corrosion resistance of the treated surface.

[0119] (9) Modification I The compressor 101 of this embodiment can be used as a compressor for use in marine environments, and as a compressor for use in household air conditioning systems, etc.

[0120] While embodiments of this disclosure have been described above, it should be understood that various modifications to the form and details are possible without departing from the spirit and scope of this disclosure as described in the claims. [Explanation of Symbols]

[0121] 1: Refrigeration equipment 10: Casing 19:Suction pipe 20: Discharge pipe (metal part) 20b :Outer surface 21: 1st groove (groove) 22: Third step (step) 23: 2nd groove (groove) 35: Injection tube 40: Thermal spray coating 40a: Edge 50: Heat-resistant masking cap (protective material) 101: Compressor [Prior art documents] [Patent Documents]

[0122] [Patent Document 1] Japanese Patent Publication No. 2002-303272

Claims

1. Casing (10) and A metal part (20) fixed to the casing and having an outer surface (20b) located outside the casing, Equipped with, Grooves (21, 23) or steps (22) surrounding the metal part are formed on the outer surface. A portion of the outer surface is covered with a thermal spray coating (40) made of a different type of metal than the metal part. The edge portion (40a) of the thermal spray coating is located inside the groove, or between the step and the casing. Compressor (101).

2. The aforementioned edge is covered with caulking material. The compressor according to claim 1.

3. The groove or step is covered with the caulking material. The compressor according to claim 2.

4. The aforementioned thermal spray coating is an aluminum thermal spray coating. A compressor according to any one of claims 1 to 3.

5. The aforementioned metal part is made of stainless steel. A compressor according to any one of claims 1 to 3.

6. The casing further comprises a compression mechanism having a compression chamber in which gas is compressed, The aforementioned metal part is A suction pipe (19) through which the gas before it is compressed by the compression mechanism flows. The gas, after being compressed by the compression mechanism, flows through a discharge pipe (20), and An injection pipe (35) through which the gas supplied to the compression chamber in which the gas is being compressed flows. including at least one of the following: A compressor according to any one of claims 1 to 3.

7. A compressor comprising the one described in any one of claims 1 to 3, Refrigeration device (1).

8. Casing (10) and A metal part (20) fixed to the casing and having an outer surface (20b) located outside the casing, A method for manufacturing a compressor (101), comprising: The first step is to cover a part of the metal part with a protective member (50), A second step involves covering a portion of the outer surface with a thermal spray coating (40) made of a different type of metal than the aforementioned metal part. A third step involves removing the protective member from the metal part and then covering the edge (40a) of the thermal spray coating with a caulking material. including, A method for manufacturing a compressor.

9. Grooves (21, 23) surrounding the metal part are formed on the outer surface. In the first step, the protective member covers a portion of the groove, In the second step, a portion of the outer surface is covered with the thermal spray coating such that the edge portion is located inside the groove. In the third step, after removing the protective member from the metal part, the groove is covered with the caulking material. A method for manufacturing a compressor according to claim 8.

10. A step (22) surrounding the metal part is formed on the outer surface. In the first step, the protective member covers the step, In the second step, the thermal spray coating covers a portion of the outer surface such that the edge is positioned between the step and the casing. In the third step, after removing the protective member from the metal part, the step and the edge are covered with the caulking material. A method for manufacturing a compressor according to claim 8.

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