JP2007120342A - Sliding member, compressor and refrigerating cycle device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable sliding member of a compressor, the highly reliable and highly efficient compressor and a refrigerating cycle device for enhancing adhesion of molybdenum disulfide to a base material of a sliding part. <P>SOLUTION: An oxygen-rich compound layer 152 can be formed by colliding a grain of the molybdenum disulfide with a sliding surface of the sliding part composed of a metallic material together with gas having the oxygen concentration of 25 vol% or more. This layer can play a role of a binder for enhancing adhesive strength of the base material and a mixing layer 150 of solidly solving the molybdenum disulfide, and improves abrasion resistance by preventing separation from the base material of the sliding part. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a compressor mainly used in an electric refrigerator-freezer for home use.

  In recent years, development of highly efficient compressors that reduce the use of fossil fuels has been promoted from the viewpoint of global environmental protection.

As a conventional sliding member for a compressor, there is a description in which a mixed layer in which molybdenum disulfide (MoS ₂ ), which is a solid lubricant, is formed on the surface of a sliding portion is formed (see, for example, Patent Document 1).

  FIG. 11 is a cross-sectional view of a conventional compressor described in Patent Document 1, and FIG. 12 is a cross-sectional view of a mixed layer in which molybdenum disulfide according to the prior art described in Patent Document 1 is dissolved. As shown in FIGS. 11 and 12, the sealed container 1 stores oil 2 at the bottom, and houses an electric element 5 including a stator 3 and a rotor 4, and a reciprocating compression element 6 driven thereby. ing.

  Next, details of the compression element 6 will be described below.

  The crankshaft 7 includes a main shaft portion 8 in which the rotor 4 is press-fitted and fixed, and an eccentric shaft 9 formed eccentric to the main shaft portion 8, and an oil supply pump 10 is provided. The cylinder block 11 forms a compression chamber 13 composed of a substantially cylindrical bore 12 and is provided with a bearing portion 14 that supports the main shaft portion 8.

  The piston 15 loosely fitted to the bore 12 is connected to the eccentric shaft 9 via a piston pin 16 by a connecting rod 17 that is a connecting means. The end face of the bore 12 is sealed with a valve plate 18.

  The head 19 forms a high-pressure chamber and is fixed to the valve plate 18 on the side opposite to the bore 12. The suction tube 20 is fixed to the sealed container 1 and connected to the low pressure side (not shown) of the refrigeration cycle, and guides a refrigerant gas (not shown) into the sealed container 1. The suction muffler 21 is sandwiched between the valve plate 18 and the head 19.

The main shaft portion 8 and the bearing portion 14 of the crankshaft 7, the piston 15 and the bore 12, the piston pin 16 and the connecting rod 17, and the eccentric shaft 9 and the connecting rod 17 of the crankshaft 7 form a sliding portion. The sliding member that constitutes the sliding part has either one of the sliding part surfaces collided with molybdenum disulfide particles at a certain speed or higher against the sliding surface of the metal that is the base material of the sliding part. Thus, a mixed layer in which molybdenum disulfide (MoS ₂ ), which is a solid lubricant, is dissolved is formed.

  Next, the operation of the above configuration will be described. Electric power supplied from a commercial power source (not shown) is supplied to the electric element 5 to rotate the rotor 4 of the electric element 5. The rotor 4 rotates the crankshaft 7, and the eccentric movement of the eccentric shaft 9 drives the piston 15 from the connecting rod 17 of the connecting means through the piston pin 16, whereby the piston 15 reciprocates in the bore 12, and the suction tube The refrigerant gas introduced into the sealed container 1 through 20 is sucked from the suction muffler 21 and continuously compressed in the compression chamber 13.

  As the crankshaft 7 rotates, the oil 2 is supplied to each sliding portion from the oil supply pump 10, lubricates the sliding portion, and controls the seal between the piston 15 and the bore 12.

  Here, the piston 15 and the bore 12 are loosely fitted with a very narrow clearance in order to reduce leakage loss. As a result, depending on the variations in the shape and accuracy of the piston 15 and the bore 12, there may be a part that causes mutual contact.

However, by forming the mixed layer 33 on which molybdenum disulfide is fixed on the sliding surface of the sliding component, the piston 15 has a speed of 0 at the top dead center and the bottom dead center, and metal contact occurs with the bore 12. Even in this case, the friction coefficient is lowered by the solid lubricity of the molybdenum disulfide in the mixed layer 33 formed on the surface of the piston 15, and the sliding loss can be reduced. Further, by providing the fine recess 34 on the surface of the sliding portion, it can function as a labyrinth seal during compression, reduce leakage loss and improve wear resistance.
International Publication No. 04/055371 Pamphlet

  However, in the above-described conventional configuration, there is an adhesive layer 33 that has low adhesion and is easily peeled off from the base material of the sliding portion.

  As a result of investigating the cause, those that easily peel off have a low oxygen concentration in the oxygen-rich compound layer formed from oxygen, iron, molybdenum, sulfur between the mixed layer 33 and the base material, or the compound layer It was found that it was hardly formed.

  The oxygen-rich compound layer is formed by the energy generated when molybdenum disulfide grains collide with the sliding surface of the metal, which is the base material, and the oxygen on the surface of the base material together with the base material and molybdenum disulfide grains. Presumably formed by reaction.

  Since this compound layer has a high affinity between oxygen and metal, the oxygen-rich compound layer serves as a binder between the mixed layer 33 and the base material, so that the mixed layer 33 and the base material in which molybdenum disulfide is dissolved It is presumed that the adhesion strength with is increased.

  That is, in the above-described conventional configuration, wear occurs in the oxygen-rich compound layer formed between the mixed layer 33 and the base material, and as a result, the adhesion between the mixed layer 33 and the base material is low. It is estimated that the wear resistance is lowered due to the separation of the mixed layer 33.

  If the separation of the mixed layer 33 occurs between the piston 15 and the bore 12, the clearance increases, and the compressed refrigerant gas leaks from the clearance between the piston 15 and the bore 12, which may reduce the efficiency.

  The present invention solves the above-described conventional problems, and has high adhesion of molybdenum disulfide to the base material of the sliding part, and a highly reliable compressor sliding member and highly reliable and highly efficient. It aims at providing a compressor and a refrigerating cycle device.

  In order to solve the above-described conventional problems, the sliding member of the compressor according to the present invention includes molybdenum disulfide particles together with a gas having an oxygen concentration of 25 vol% or more on at least one sliding surface of a sliding component made of a metal material. , By the thermal energy generated at the time of collision, oxygen having a high oxygen concentration of 25 vol% or more and oxygen on the surface of the base material react with molybdenum disulfide and the base material to form an oxygen-rich compound layer. As a result, the adhesive force between the mixed layer in which molybdenum disulfide is dissolved and the base material is increased, and the sliding portion has an effect of preventing peeling from the base material.

  The sliding member, compressor, and refrigeration cycle apparatus of the compressor of the present invention have a high reliability because the adhesion between the base material and the mixed layer in which molybdenum disulfide is dissolved is increased and the base material is difficult to peel off. A sliding member can be provided, and a highly reliable and highly efficient compressor and refrigeration cycle apparatus can be provided.

  According to the first aspect of the present invention, there is provided a mixed layer in which molybdenum disulfide is solid-solved by colliding particles of molybdenum disulfide with a gas having an oxygen concentration of 25 vol% or more on a sliding surface of a sliding component made of a metal material. With the thermal energy generated at the time of collision, oxygen having a high oxygen concentration of 25 vol% or more and oxygen on the surface of the base material react with molybdenum disulfide and the base material to form an oxygen-rich compound. Since the affinity between oxygen and metal is high, the metal oxide in the compound layer acts as a binder with the base material, increasing the adhesion between the mixed layer of molybdenum disulfide and the base material, and the sliding part Therefore, it is possible to provide a highly reliable sliding member for a compressor.

  The invention according to claim 2 is the invention according to claim 1, wherein the relative humidity of a gas having an oxygen concentration of 25 vol% or more is 1000 ppm or less, and the relative humidity is 1000 ppm or less. In addition to the effects of the invention described in (1), since the moisture is very small during the treatment reaction, it is possible to provide a sliding member for a compressor which is not easily rusted.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the oil is stored in a sealed container and the compression element is accommodated, and the compression element includes a main shaft and an eccentric shaft. A thrust part formed integrally with the crankshaft and the other integrally formed with the bearing part, a bearing part rotatably supporting the main shaft, a cylinder block forming a cylinder, and an inner part of the cylinder A reciprocating type compression element comprising a piston reciprocatingly moving, a piston pin arranged parallel to the eccentric shaft and fixed to the piston, and a connecting rod connecting the eccentric shaft and the piston. The part is at least one of crankshaft, thrust part, cylinder block, piston, piston pin, and connecting rod. Therefore, the adhesion of molybdenum disulfide to the base material of the sliding part is high, so that the molybdenum disulfide is not easily peeled off, and the solid lubricating action of molybdenum disulfide is exerted, thereby Since the friction coefficient is reduced and the sliding loss is reduced, the clearance does not increase particularly between the piston and the bore, and the compressed refrigerant gas does not leak from the clearance between the piston and the bore. Therefore, a compressor having a highly reliable and highly efficient reciprocating compression element can be provided.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, oil is stored in a sealed container and a compression element is accommodated, and the compression element includes a shaft having an eccentric portion, and the shaft. A cylinder that forms a compression chamber concentrically with the center of rotation, a roller that is fitted in the eccentric portion and rolls in the compression chamber, and is in pressure contact with the roller so that the compression chamber is moved to a high pressure side and a low pressure side. A partition vane, sealing both side surfaces of the cylinder, a main bearing on the electric element side supporting the shaft, a sub bearing on the counter-electric element side, an oil supply spring fixed to one end of the shaft, An oil supply spring is housed and an oil supply pipe having one end opened in the oil is formed to form a rolling piston type compression element. -Since it is at least one of roller, vane, main bearing, sub-bearing, oil supply spring, and oil supply pipe, the adhesion of molybdenum disulfide to the base material of the sliding part is high, so molybdenum disulfide is peeled off. Highly reliable and efficient rotation because it has the effect of reducing the friction coefficient of the sliding part and reducing the sliding loss. A compressor having a compression element of the formula can be provided.

  The invention according to claim 5 includes the compressor according to claim 3 or 4, has a condenser, a dryer, a capillary, and an evaporator, and uses HFC refrigerant or HC refrigerant as a refrigerant. Since the compressor of Claim 3 or 4 is highly reliable and highly efficient, a highly reliable and highly efficient refrigeration cycle apparatus can be provided.

(Embodiment 1)
1 is a cross-sectional view of a compressor and a refrigeration cycle diagram of a compressor according to Embodiment 1 of the present invention, FIG. 2 is an enlarged view of part A in FIG. 1, FIG. 3 is an enlarged view of part B in FIG. FIG. 5 is a diagram showing the formation of molybdenum disulfide in the first embodiment of the present invention, FIG. 5 is a diagram showing the relationship between the oxygen concentration of the gas and the film thickness of the compound layer in the first embodiment of the present invention, and FIG. FIG. 7 is a characteristic diagram of the compressor using the sliding material in the first embodiment, and FIG. 7 is a relationship diagram between the relative humidity of the gas and the amount of rust of the piston in the first embodiment of the present invention.

  1, 2, and 3, the hermetic container 101 is filled with the refrigerant gas 102 made of R600a or R134a, the oil 103 is stored in the bottom, and the electric element made of the stator 104 and the rotor 105. 106 and a reciprocating compression element 107 driven thereby are accommodated.

  Next, details of the compression element 107 will be described below.

  The crankshaft 108 includes a main shaft 109 in which the rotor 105 is press-fitted and fixed, and an eccentric shaft 110 formed eccentric to the main shaft 109. An oil supply pump 111 communicating with the oil 103 is provided at the lower end. A cylinder block 112 made of cast iron forms a substantially cylindrical bore 113 and a bearing portion 114 that supports the main shaft 109.

  Further, the rotor surface 105 is formed on the rotor 105, and the upper end surface of the bearing portion 114 is a thrust portion 122. A thrust washer 124 is inserted between the flange surface 120 and the thrust portion 122 of the bearing portion 114. A thrust bearing portion 126 is configured by the flange surface 120, the thrust portion 122, and the thrust washer 124.

  The piston 132 loosely fitted into the bore 113 while maintaining a certain amount of clearance is made of an iron-based material such as cast iron or an iron-based sintered material, forms a compression chamber 134 together with the bore 113, and is connected via a piston pin 137. The connecting shaft 138 is connected to the eccentric shaft 110. The end surface of the bore 113 is sealed with a valve plate 139.

  The head 140 forms a high pressure chamber and is fixed to the side opposite to the bore 113 of the valve plate 139. The suction tube 141 is fixed to the sealed container 101 and connected to the evaporator 142 side of the refrigeration cycle, and guides the refrigerant gas 102 into the sealed container 101. The suction muffler 143 is sandwiched between the valve plate 139 and the head 140.

  The piston 132 and the bore 113, the main shaft 109 and the bearing portion 114, the thrust portion 122 and the thrust washer 124, the piston pin 137 and the connecting rod 138, and the eccentric shaft 110 and the connecting rod 138 form a sliding portion with each other and At least one of them is formed with a mixed layer 150 in which molybdenum disulfide is dissolved in the surface of the base material.

  The piston 132 and the bore 113 are loosely fitted with a very narrow clearance, for example, a clearance of about 5 μm to 15 μm in diameter to reduce leakage loss.

  Here, the piston 132 will be described in detail as an example.

  Among the sliding portions formed by the piston 132 and the bore 113, a mixed layer 150 in which molybdenum disulfide is dissolved is formed on the surface of the sliding portion of the piston 132, that is, the surface of the iron-based material that is the base material. ing. More preferably, the maximum concentration of molybdenum disulfide in the mixed layer 150 is 5 wt% or more and 50 wt% or less.

  Here, a method of forming the mixed layer 150 in which molybdenum disulfide is dissolved is described with reference to FIG. In the first embodiment of the present invention, molybdenum disulfide grains together with a gas having an oxygen concentration of 25 vol% or more and a relative humidity of 1000 ppm or less on a sliding surface of a metal that is a base material of a sliding component at a predetermined speed or more. The collision method is used.

  Specifically, dry oxygen is added to dry air to increase the oxygen concentration to about 30 vol%.

  By this method, due to the energy generated when the molybdenum disulfide grains collide, high concentration oxygen unevenly distributed on the surface of the base material and the surroundings is combined with the molybdenum disulfide and the base material. A compound layer 152 made of oxygen-rich oxygen, iron, molybdenum and sulfur is formed. At this time, since the affinity between oxygen and metal is high, the metal oxide in the compound layer 152 plays a role of a binder with the base material, thereby improving the adhesion between the mixed layer 150 in which molybdenum disulfide is dissolved and the base material. It is estimated that it can be increased stably.

  As a result, it is possible to form the mixed layer 150 having an extremely strong adhesive force and to prevent the sliding portion from being peeled off from the base material, so that it is possible to provide a highly reliable compressor sliding member and high reliability. And a highly efficient compressor and refrigeration cycle apparatus can be provided.

  Further, the compressor 160 is sequentially connected to a condenser 164, a dryer 166, a capillary 168, and an evaporator 142 through a discharge tube 162 and a suction tube 141, as shown in FIG. 1, and constitutes a known refrigeration cycle.

  The operation of the compressor 160 and the refrigeration cycle apparatus configured as described above will be described below.

  Electric power supplied from a commercial power source (not shown) is supplied to the electric element 106 to rotate the rotor 105 of the electric element 106. The rotor 105 rotates the crankshaft 108, and the eccentric movement of the eccentric shaft 110 drives the piston 132 from the connecting rod 138 of the connecting means through the piston pin 137, whereby the piston 132 reciprocates in the bore 113, and the suction tube The refrigerant gas 102 introduced into the sealed container 101 through 180 is sucked from the suction muffler 143 and compressed in the compression chamber 134.

  As the crankshaft 108 rotates, the oil 103 is supplied to each sliding portion from the oil supply pump 111, lubricates the sliding portion, and controls the seal between the piston 132 and the bore 113.

At this time, since the clearance between the piston 132 and the bore 113 is very narrow, a portion that causes mutual contact may occur depending on variations in the shape and accuracy of the piston 132 and the bore 113. In such a case, if the adhesiveness of molybdenum disulfide to the base material is high, the molybdenum disulfide does not peel off, the structure of molybdenum disulfide is a dense hexagonal crystal, and the molecular size is about 6 × 10 ^−. Cleaving with a low coefficient of friction due to being as small as ⁴ μm lowers the coefficient of friction of the sliding portion and reduces the sliding loss, so that a highly reliable and highly efficient compressor can be provided.

  In addition, since molybdenum disulfide does not peel off, wear does not easily occur. Therefore, the clearance between the piston 132 and the bore 113 is not easily increased, and the compressed refrigerant gas 102 does not leak from the clearance between the piston 132 and the bore 113. An efficient compressor can be provided.

  Next, FIG. 5 shows the relationship between the oxygen concentration of the gas and the film thickness of the compound layer 152 as a result of the study on the generation of the compound layer that increases the adhesion. The horizontal axis represents the oxygen concentration of the gas, and the vertical axis represents the film thickness of the compound layer 152. From FIG. 5, when the oxygen concentration is 25 vol% or more, the film thickness surely becomes 10 nm or more and shows a substantially constant value. From this, it can be seen that the compound layer 152 having a stable film thickness can be obtained at an oxygen concentration of 25 vol% or more, and the adhesion of the base material can be secured.

  The film thickness of the compound layer 152 is almost constant even when the oxygen concentration of the gas is increased. The oxygen concentration is 25%, and the solid solution limit of oxygen in molybdenum, sulfur, and iron under the thermal energy under these conditions This is probably due to the fact that

  Further, as a reference, FIG. 6 shows a comparison between the characteristics of the compressor using the sliding material in Embodiment 1 of the present invention and the characteristics of the conventional compressor. Both sliding materials using molybdenum disulfide are used for pistons, and the clearance between the piston and bore is the same. FIG. 6 clearly shows that the efficiency of the compressor 160 shown in the first embodiment is stably higher than that of the conventional compressor.

  Next, when the piston 132 is positioned at the top dead center and the bottom dead center, the speed becomes 0 m / s, and no oil pressure is theoretically generated, so that no oil film is formed. Often occurs.

  Further, in the compressor 160, when the piston 132 is in the vicinity of the top dead center, a large compression load is received by the high-pressure refrigerant in which the piston 132 is compressed. This compressive load is transmitted to the crankshaft 108 via the piston pin 137 and the connecting rod 138, and the crankshaft 108 is pushed in the direction of the anti-piston 132 and tilts. This inclination becomes a force for inclining the piston 132 in the bore 113. As a result, the upper end of the piston 132 on the top surface side and the lower end on the side opposite to the top surface are twisted with the bore 113. This twisting causes the piston 132 to come into contact with the bore 113 to cause wear.

  In particular, in the case of the cantilever bearing compressor shown in the first embodiment, since the inclination of the crankshaft 108 becomes large, this twisting appears remarkably. As a result, the molybdenum disulfide mixed layer 150 may be easily peeled off.

However, in Embodiment 1, since molybdenum disulfide in the mixed layer 150 has high adhesion to the base material due to the compound layer 152, molybdenum disulfide is difficult to peel off, so the structure of molybdenum disulfide is a dense hexagonal crystal. Since the molecular size is as small as about 6 × 10 ⁻⁴ μm, cleavage with a low coefficient of friction lowers the coefficient of friction of the sliding part and reduces the sliding loss. Therefore, a highly reliable compressor 160 can be provided.

  Further, by setting the maximum concentration of molybdenum disulfide in the mixed layer 150 to 5 wt% or more and 20 wt% or less, the self-lubricating property of molybdenum disulfide is stabilized and the friction coefficient is further reduced, so that the reliability and efficiency can be further improved. A compressor 160 can be provided.

  Furthermore, in Embodiment 1 of the present invention, when the mixed layer 150 in which molybdenum disulfide is dissolved in the metal sliding surface that is the base material of the piston 132 is formed, the oxygen concentration is 25 vol% or more, In addition, since the molybdenum disulfide grains having a purity of 98% or more and a gas having a relative humidity of 1000 ppm or less are collided at a certain speed or more, the amount of moisture during the treatment reaction is very small. 132 is very hard to rust.

  Here, as a reference, the relationship between the relative humidity of the gas and the rust degree of the piston is shown in FIG. The piston is 30 days after the treatment and left in a place under the same conditions. The horizontal axis indicates the relative humidity of the gas, and the vertical axis indicates the amount of rust per certain surface area of the piston. As can be seen from FIG. 7, the amount of rust is extremely increased after the relative humidity of the gas exceeds 1000 ppm.

  In the first embodiment of the present invention, the compressor 160 having a constant speed has been described. However, while the speed of the compressor 160 is decreasing as the inverter is changed, particularly in an ultra-low speed operation of less than 20 Hz. Furthermore, it becomes difficult to establish fluid lubrication and it is easy to make metal contact, so the effect of the present invention becomes more remarkable.

  In Embodiment 1 of the present invention, the mixed layer 150 in which molybdenum disulfide is dissolved is formed on the surface of the sliding portion of the piston 132. However, the mixed layer 150 is applied to both the bore 113 and both the piston 132 and the bore 113. And higher wear resistance can be obtained.

  Further, in the first embodiment of the present invention, the example in which the mixed layer 150 in which molybdenum disulfide is dissolved is formed on the surface of the sliding portion of the piston 132 is described in detail, but the sliding portion is formed mutually. The main shaft 109 and the bearing portion 114 of the crankshaft 108, the flange surface 120 and the thrust washer 124 of the rotor 105, the thrust portion 122 and the thrust washer 124 on the upper end surface of the bearing portion 114, the piston pin 137 and the connecting rod 138, and the eccentric shaft Even in the sliding portion between 110 and the connecting rod 138, a considerable effect can be obtained.

  Further, in the first embodiment of the present invention, the thrust bearing portion 126 is configured by the flange surface 120, the thrust portion 122, and the thrust washer 124. However, the main shaft 109 and the eccentric shaft 110 of the crankshaft 108 are described. Even when a thrust bearing is constituted by the thrust surface 172 of the crankshaft 108 provided on the side opposite to the eccentric shaft 110 of the flange portion 170 and the thrust portion 122 of the bearing portion 114, a considerable effect can be obtained.

  Furthermore, since the compressor 160 has high reliability and high efficiency, the refrigeration system apparatus can inevitably provide high reliability and high efficiency.

(Embodiment 2)
8 is a cross-sectional view of a compressor and a refrigeration cycle apparatus diagram according to Embodiment 2 of the present invention, FIG. 9 is a cross-sectional view taken along line CD of FIG. 8, and FIG. 10 is an enlarged view of a portion E in FIG. .

  8, 9, and 10, the hermetic container 201 stores an electric element 204 including a stator 202 and a rotor 203, and a rolling piston type compression element 205 driven by the electric element 204 together with oil 206. Yes.

  The compression element 205 includes a shaft 210 having an eccentric portion 207, a main shaft portion 208, and a sub shaft portion 209, a cylinder 212 that forms a compression chamber 211, and both ends of the cylinder 212 are sealed and the main shaft portion 208 and the sub shaft portion are respectively sealed. A main bearing 213 and a sub-bearing 214 that support the shaft 209, a roller 215 that is loosely fitted in the eccentric portion 207 and rolls in the compression chamber 211, is inserted into the roller 215, and the compression chamber 211 is moved to the high pressure side and the low pressure side. A partition plate-like vane 216 is provided, and a rotor 203 is fixed to the main shaft portion 208.

  The oil pump 217 fixed to the sub-bearing 214 includes an oil supply pipe 220 and an oil supply spring 222 that is loosely fitted to the oil supply pipe 220, communicates with the oil 206, and has an eccentric part 207, a roller 215, a main shaft part 208, and a main bearing 213. The oil supply to the sliding portions formed by the auxiliary shaft portion 209 and the auxiliary bearing 214 is performed.

  Then, a mixed layer 224 in which molybdenum disulfide is dissolved is formed on the surface of the iron-based material that is the base material on the sliding surface of the eccentric portion 207, the main shaft portion 208, and the auxiliary shaft portion 209 of the shaft 210. Yes. More preferably, the maximum concentration of molybdenum disulfide in the mixed layer 224 is 5 wt% or more and 50 wt% or less.

  Here, a method for forming the mixed layer 224 in which molybdenum disulfide is dissolved is described with reference to FIGS. In the second embodiment of the present invention, molybdenum disulfide grains together with a gas having an oxygen concentration of 25 vol% or more and a relative humidity of 1000 ppm or less are applied to the sliding surface of the metal that is the base material of the sliding component at a predetermined speed or more. The collision method is used.

  Specifically, dry oxygen is added to dry air to increase the oxygen concentration to about 30 vol%.

  By this method, the energy generated when the molybdenum disulfide grains collide causes high concentration of oxygen that is unevenly distributed on the surface of the base material to bond with molybdenum disulfide and the base material, and oxygen is mixed between the mixed layer 224 and the base material. A compound layer 226 made of rich oxygen, iron, molybdenum, and sulfur is formed. At this time, since the affinity between oxygen and metal is high, the metal oxide in the compound layer 226 plays a role of a binder with the base material, so that the adhesion between the mixed layer 224 in which molybdenum disulfide is dissolved and the base material is increased. It is estimated that it can be increased stably.

  As a result, it is possible to form the mixed layer 224 with extremely strong adhesion, and to prevent the sliding portion from being peeled off from the base material. Therefore, it is possible to provide a highly reliable compressor sliding member and to provide high reliability. And a highly efficient compressor and refrigeration cycle apparatus can be provided.

  Further, the compressor 275 is sequentially connected to the condenser 282, the dryer 284, the capillary 286, and the evaporator 288 through the discharge tube 277 and the suction tube 280 as shown in FIG. 8 to constitute a known refrigeration cycle. Yes.

  The operation of the compressor 275 and the refrigeration system apparatus configured as described above will be described below.

  As the rotor 203 rotates, the shaft 210 rotates, and the roller 215 loosely fitted to the eccentric portion 207 rolls in the compression chamber 211, so that the high-pressure side and the low-pressure side chamber of the compression chamber 211 are continuous. Thus, the refrigerant gas is continuously compressed. Further, the compressed refrigerant gas is discharged into the sealed container 201, and the inside of the sealed container 201 becomes a high-pressure atmosphere. Further, since the inside of the sealed container 201 is at a high pressure, the atmospheric pressure in the sealed container 201 acts on the vane 216 as a back pressure, and the tip of the vane 216 is pressed against the outer peripheral surface of the roller 215.

  Further, the oil supply spring 222 loosely fitted in the oil supply pipe 220 with the rotation of the shaft 210 continuously supplies the oil 206 to each sliding portion.

  Here, in particular, in the rolling piston type compressor, since the roller 215 is loosely fitted to the eccentric part 207, the relative speed between the roller 215 and the eccentric part 207 is the main shaft part 208, the main bearing 213, The relative speed between the auxiliary shaft portion 209 and the auxiliary bearing 214 becomes smaller. This means that the Sommerfeld number S (Equation 1) indicating the characteristics of the journal bearing obtained from the bearing radius R, the radial clearance C, the speed N, the oil viscosity μ, and the surface pressure P is reduced. This is a disadvantageous condition in which metal contact is likely to occur.

S = μ × N / P × (R / C) ² (Equation 1)
Further, in a rolling piston type compressor, since the inside of the sealed container 201 generally has a condensation pressure, the internal pressure is high and the refrigerant of the oil 206 is likely to be melted. This is to reduce the viscosity of the oil, to reduce the Sommerfeld number S (Equation 1) indicating the characteristics of the journal bearing described above, which is a disadvantageous condition for sliding lubrication.

However, in such a case, the mixed layer 224 in which molybdenum disulfide is dissolved is formed on the surface of the sliding portion of the eccentric portion 207, the main shaft portion 208, and the auxiliary shaft portion 209 of the shaft 210, so that the Sommerfeld number is increased. Even under disadvantageous conditions for sliding lubrication where S (Equation 1) is small, molybdenum disulfide has high adhesion to the base material due to the compound layer 226, so that molybdenum disulfide is difficult to peel off. Since the structure is a dense hexagonal crystal and the molecular size is as small as about 6 × 10 ⁻⁴ μm, cleaving with a low coefficient of friction reduces the friction coefficient of the sliding part and reduces the sliding loss. A highly reliable compressor 275 can be provided.

  In addition, by setting the maximum concentration of molybdenum disulfide in the mixed layer 224 to 5 wt% or more and 20 wt% or less, the self-lubricating property of molybdenum disulfide is stabilized and the friction coefficient is further reduced, so that the reliability and efficiency can be further improved. A compressor 275 can be provided.

  Furthermore, in the second embodiment of the present invention, a mixed layer in which molybdenum disulfide is dissolved in a metal sliding surface which is a base material of the eccentric portion 207, the main shaft portion 208, and the sub shaft portion 209 of the shaft 210. When forming 224, because the molybdenum disulfide grains collide with a gas having an oxygen concentration of 25 vol% or more and a relative humidity of 1000 ppm or less at a certain speed or more, the amount of moisture during the treatment reaction is very small. The shaft 210 before being assembled into the machine 227 is very resistant to rust.

  In the second embodiment of the present invention, the mixed layer 224 in which molybdenum disulfide is dissolved is formed on the sliding surfaces of the eccentric portion 207, the main shaft portion 208, and the auxiliary shaft portion 209. The inner peripheral surface, the main bearing 213, the auxiliary bearing 214, both the eccentric portion 207 and the inner peripheral surface of the roller 215, both the main shaft portion 208 and the main bearing 213, and both the auxiliary shaft portion 209 and the auxiliary bearing 214 may be applied. Well, a considerable effect can be obtained.

  Further, the rollers 215 and vanes 216, the main bearing 208 and the vane 216, the auxiliary bearing 209 and the vane 216, the main bearing 208 and the roller 215, the auxiliary bearing 209 and the roller 215, the cylinder 212 and the vane, which form sliding portions with each other, are formed. Even when the mixed layer 224 in which molybdenum disulfide is dissolved is formed on the surfaces of the sliding portions of the cylinder 216, the cylinder 212 and the roller 215, and the oil supply pipe and the oil supply spring, considerable effects can be obtained.

  As described above, in the second embodiment of the present invention, the compressor 275 having a constant speed has been described. However, as the speed of the compressor 275 is reduced along with the inverter, particularly in an ultra-low speed operation of less than 20 Hz. Furthermore, the problem of abnormal wear increases and the effects of the present invention become more prominent.

  Furthermore, since the compressor 275 has high reliability and high efficiency, the refrigeration system apparatus can inevitably provide high reliability and high efficiency.

  As described above, in the compressor according to the present invention, a mixed layer in which molybdenum disulfide is dissolved is formed on the sliding surface of the sliding component, and a single layer of molybdenum disulfide is further formed on the surface of the mixed layer. Since the friction coefficient can be reduced and a highly reliable and highly efficient compressor can be provided, it can be widely applied to equipment using a refrigeration cycle.

Sectional drawing of the compressor in Embodiment 1 of this invention, and refrigeration cycle apparatus figure Part A enlarged view in FIG. Part B enlarged view in FIG. Formation diagram of molybdenum disulfide in Embodiment 1 of the present invention Relationship diagram between oxygen concentration of gas and film thickness of compound layer in Embodiment 1 of the present invention Characteristic diagram of compressor using sliding material in embodiment 1 of the present invention FIG. 3 is a relationship diagram of the relative humidity of the gas and the amount of rust on the piston in the first embodiment of the present invention. Sectional drawing and refrigeration cycle apparatus figure of the compressor in Embodiment 2 of this invention CD sectional view of FIG. E section enlarged view in FIG. Cross section of a conventional compressor Cross section of a conventional mixed layer in which molybdenum disulfide is dissolved

Explanation of symbols

101, 201 Airtight container 103, 206 Oil 107, 205 Compression element 108 Crankshaft 109 Main shaft 110 Eccentric shaft 112 Cylinder block 114 Bearing portion 122 Thrust portion 132 Piston 137 Piston pin 138 Connecting rod 142,288 Evaporator 150,224 Mixing layer 160, 275 Compressor 164,282 Condenser 166,284 Dryer 168,286 Capillary 204 Electric element 207 Eccentric part 208 Main shaft part 210 Shaft 212 Cylinder 213 Main bearing 214 Sub bearing 215 Roller 216 Vane 220 Oil supply pipe 222 Oil supply spring

Claims (5)

  A sliding member in which a mixed layer in which molybdenum disulfide is dissolved is formed by colliding particles of molybdenum disulfide with a gas having an oxygen concentration of 25 vol% or more on a sliding surface of a sliding component made of a metal material.   The sliding member according to claim 1, wherein the relative humidity of a gas having an oxygen concentration of 25 vol% or more is 1000 ppm or less.   Oil is stored in a sealed container and a compression element is accommodated. The compression element is formed integrally with the crankshaft having a main shaft and an eccentric shaft, and the other is formed integrally with the crankshaft. A thrust portion, a bearing portion that rotatably supports the main shaft, a cylinder block that forms a cylinder, a piston that reciprocates in the cylinder, and a shaft that is disposed in parallel to the eccentric shaft and fixed to the piston. A piston pin, a connecting rod that connects the eccentric shaft and the piston are formed to form a reciprocating compression element, and at least one of the crankshaft, thrust portion, cylinder block, piston, piston pin, and connecting rod is defined in claim 1 or 2. A compressor using the sliding member described in 1.   Oil is stored in a sealed container and a compression element is accommodated. The compression element is fitted to the eccentric part, a shaft having an eccentric part, a cylinder concentrically forming a compression chamber at the rotation center of the shaft, and the eccentric part. A roller that rolls in the compression chamber, a vane that is pressed against the roller to partition the compression chamber into a high-pressure side and a low-pressure side, and an electric element that seals both side surfaces of the cylinder and supports the shaft A rolling piston type compression comprising a main bearing on the side and a sub bearing on the side of the non-electric element, an oil supply spring fixed to one end of the shaft, and an oil supply pipe which houses the oil supply spring and is open at one end in the oil And forming at least one of the shaft, cylinder, roller, vane, main bearing, auxiliary bearing, oil supply spring, and oil supply pipe. Compressor using the sliding member according to 2.   A refrigeration cycle apparatus comprising the compressor according to claim 3, comprising a condenser, a dryer, a capillary, and an evaporator, and using HFC refrigerant or HC refrigerant as a refrigerant.

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