JPWO2018199204A1 - Hermetic refrigerant compressor and refrigeration device using the same - Google Patents

Abstract

The hermetic refrigerant compressor (100) is housed in a hermetic container (101) and includes a compression element (107) for compressing a refrigerant and an electric element (106) for driving the compression element (107). A lubricating oil (103) is stored in the closed container (101). The lubricating oil (103) is a mixed oil composed of at least a mineral oil and a synthetic oil. Further, the lubricating oil (103) has a kinematic viscosity at 40 ° C within the range of 0.1 mm2 / s to 5.1 mm2 / s, and has a flash point of 110 ° C or higher.

Description

  The present invention relates to a hermetic refrigerant compressor using lubricating oil of lower viscosity and having good productivity, and a refrigeration system using the hermetic refrigerant compressor.

  In recent years, from the viewpoint of global environmental protection, the development of a high-efficiency refrigerant compressor that reduces the use of fossil fuels has been promoted. For example, it has been proposed to use a lubricating oil having a lower viscosity in order to achieve higher efficiency.

For example, Patent Literatures 1 and 2 disclose a specific composition containing an ester as a lubricating oil composition for a refrigerator having low viscosity, good lubricity, and excellent long-term stability in a low temperature region. Have been. Each of these lubricating oil compositions has a kinematic viscosity at 40 ° C. in the range of 6 to 28 mm ² / s.

  By the way, in a refrigerant compressor, it is known that when a lubricating oil having a lower viscosity is used, abrasion or seizure of a sliding member constituting a sliding portion occurs. Therefore, a technique for imparting wear resistance to a sliding member or lubricating oil has been proposed.

  For example, Patent Literature 3 discloses that in order to prevent wear or seizure of a sliding member due to use of a low-viscosity lubricating oil, a piston and a connecting rod constituting a sliding portion are iron-based sintered. There is disclosed a configuration in which a steam layer is formed of a material, and then a steam layer is cut off from the piston surface, and a nitriding process is performed on the connecting rod after the steam process.

Patent Document 3 describes that the lubricating oil preferably has a kinematic viscosity at 40 ° C. of 3 to 10 mm ² / s. According to Patent Document 3, if the kinematic viscosity of the lubricating oil is less than 3 mm ² / s, the viscosity when the refrigerant is dissolved becomes low, the oil film is not sufficiently held, the lubricating property is poor, and the lubricating oil has a poor lubricating property. It is described that the sealing property cannot be maintained.

Patent Document 4 discloses a configuration in which a predetermined amount of a specific phosphorus compound is added to a lubricating base oil in order to improve the wear resistance of refrigerator oil. Patent Literature 4 describes that the lubricating base oil preferably has a kinematic viscosity at 40 ° C. in the range of 3 to 300 mm ² / s.

JP-A-2006-160781 JP 2006-328275 A JP 2011-021530 A JP 2013-203988 A

  Recently, studies have been made on using lubricating oils for refrigerant compressors having lower viscosities lower than the lower limit of the kinematic viscosity disclosed in Patent Documents 1 to 4.

  Here, when the viscosity of the lubricating oil is reduced, the volatility is increased, so that the flash point decreases with the reduction in the viscosity. If the flash point of the lubricating oil is reduced, more strict attention must be paid to fire when handling the lubricating oil. In addition, special storage conditions are required because the low-distilled components contained in the lubricating oil may evaporate first to increase the viscosity. As described above, lowering the viscosity of the lubricating oil lowers the handleability of the lubricating oil, and as a result, lowers the productivity of the refrigerant compressor.

  Conventionally, such a decrease in lubricating oil handleability and the accompanying decrease in the productivity of the refrigerant compressor, as is clear from the fact that none of Patent Documents 1 to 4 describe at all, Little has been considered.

  The present invention has been made to solve such a problem, and includes a hermetic-type refrigerant compressor capable of realizing good productivity even when using a lubricating oil having a lower viscosity. An object is to provide a refrigeration apparatus.

In order to solve the above-mentioned problems, a closed-type refrigerant compressor according to the present invention includes a compression element that is housed in a closed container and compresses a refrigerant, and an electric element that drives the compression element. lubricating oil is stored in the lubricating oil, along with a mixed oil composed of at least mineral and synthetic oils, ranging kinematic viscosity of 0.1mm ² /s~5.1mm ² / s at 40 ° C. And the flash point is 110 ° C. or higher.

  According to the above configuration, the main component (base oil) of the lubricating oil is not only a mineral oil but also a mixed oil with a synthetic oil, and when the mineral oil and the synthetic oil are blended, the kinematic viscosity falls within the above range. In addition, the lower limit of the flash point is adjusted so as to be the above value. As a result, a lubricating oil having a low viscosity and a high flash point can be obtained, so that a decrease in handleability of the lubricating oil can be effectively suppressed. Therefore, by using such a lubricating oil, not only can the efficiency of the hermetic refrigerant compressor be improved, but also good productivity can be realized even if a lubricating oil having a lower viscosity is used.

  The present invention also includes a refrigeration apparatus including the hermetic-type refrigerant compressor having the above configuration. This makes it possible to provide a refrigeration apparatus having good performance and excellent productivity.

  According to the present invention, with the above configuration, it is possible to provide a hermetic-type refrigerant compressor capable of realizing good productivity even with a lower-viscosity lubricating oil and a refrigeration apparatus including the same. It works.

1 is a schematic cross-sectional view illustrating an example of a typical configuration of a hermetic-type refrigerant compressor according to Embodiment 1 of the present disclosure. FIG. 9 is a schematic diagram illustrating an example of a typical configuration of a refrigeration apparatus according to Embodiment 2 of the present disclosure.

The hermetic-type refrigerant compressor according to the present disclosure is housed in an airtight container, includes a compression element that compresses a refrigerant, and an electric element that drives the compression element, and lubricating oil is stored in the airtight container, the lubricating oil, along with a mixed oil composed of at least mineral and synthetic oils, is in the range kinematic viscosity of 0.1mm ² /s~5.1mm ² / s at 40 ° C., and a flash point Is 110 ° C. or higher.

  According to the above configuration, the main component (base oil) of the lubricating oil is not only a mineral oil but also a mixed oil with a synthetic oil, and when the mineral oil and the synthetic oil are blended, the kinematic viscosity falls within the above range. In addition, the lower limit of the flash point is adjusted so as to be the above value. As a result, a lubricating oil having a low viscosity and a high flash point can be obtained, so that a decrease in handleability of the lubricating oil can be effectively suppressed. Therefore, by using such a lubricating oil, not only can the efficiency of the hermetic refrigerant compressor be improved, but also good productivity can be realized even if a lubricating oil having a lower viscosity is used.

  In the hermetic refrigerant compressor having the above configuration, the content of the synthetic oil in the lubricating oil may be in the range of 0.1 to 40.0% by weight of the total amount of the lubricating oil.

  According to the configuration, by setting the content of the synthetic oil within the above range, the lower limit of the kinematic viscosity and the flash point of the lubricating oil can be easily adjusted to the above numerical range.

  Further, in the hermetic refrigerant compressor having the above configuration, the synthetic oil is at least one selected from the group consisting of an ester oil, an ether oil, a polyalkylene glycol oil, and an alkylbenzene oil. Is also good.

  According to the configuration, the synthetic oil is at least one selected from the group, and is blended with the mineral oil, so that the lower limit of the kinematic viscosity and the flash point of the lubricating oil can be easily adjusted to the above numerical range. It becomes possible to adjust.

  Further, in the hermetic refrigerant compressor having the above configuration, the lubricating oil may further include at least one of an extreme pressure additive, an oil agent, an antifoaming agent, and a stabilizer. You may.

  According to the configuration, by adding any one of the additives to the lubricating oil, the properties of the lubricating oil can be improved, and the reliability of the hermetic refrigerant compressor can be improved.

  Further, in the hermetic refrigerant compressor having the above configuration, the content of the additive may be in the range of 0.1 to 4.0% by weight of the total amount of the lubricating oil.

  According to the configuration, by adjusting the content of the additive added to the lubricating oil within the above range, the properties of the lubricating oil can be improved with an appropriate amount of the additive. The reliability of the compressor can be improved.

  Further, in the hermetic-type refrigerant compressor having the above configuration, the lubricating oil may have a distillation characteristic in a distillation range of 200 to 400 ° C.

  According to the configuration, as long as the distillation characteristic of the lubricating oil has the above-described distillation range, the tendency of lowering the flash point of the lubricating oil can be more effectively suppressed, and the lubricating oil has good stability. Therefore, the handling property of the lubricating oil can be further improved.

  Further, a refrigeration apparatus according to the present disclosure is configured to include the hermetic-type refrigerant compressor having any one of the above-described configurations. Accordingly, the refrigeration apparatus includes the hermetic-type refrigerant compressor having high efficiency and good productivity, so that a refrigeration apparatus having good performance and excellent productivity can be provided.

  Hereinafter, typical embodiments of the present disclosure will be described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference symbols throughout the drawings, and redundant description will be omitted.

(Embodiment 1)
[Configuration of refrigerant compressor]
First, a representative example of the refrigerant compressor according to Embodiment 1 will be specifically described with reference to FIG. FIG. 1 is a schematic cross-sectional view of a refrigerant compressor 100 according to the first embodiment.

  As shown in FIG. 1, in a refrigerant compressor 100, a closed casing 101 is filled with a refrigerant gas 102, and a lubricating oil 103 is stored at a bottom. In the present disclosure, for example, a hydrocarbon-based refrigerant is used as the refrigerant gas 102 as described below, and a mixed oil composed of at least a mineral oil and a synthetic oil is used as the lubricating oil 103 as described below. . In addition, an electric element 106 including a stator 104 and a rotor 105 and a reciprocating compression element 107 driven by the electric element 106 are housed in the sealed container 101.

  And the compression element 107 is comprised by the crankshaft 108, the cylinder block 112, the piston 115, etc. The configuration of the compression element 107 will be described below.

  The crankshaft 108 includes at least a main shaft portion 109 into which the rotor 105 is press-fitted and fixed, and an eccentric shaft 110 formed eccentrically with respect to the main shaft portion 109. An oil supply pump 111 that communicates with the lubricating oil 103 is provided at a lower end of the crankshaft 108.

  The cylinder block 112 is made of cast iron, has a substantially cylindrical bore 113, and has a bearing 114 that supports the main shaft 109.

  Further, a flange surface 116 is formed on the rotor 105, and an upper end surface of the bearing portion 114 is a thrust surface 117. A thrust washer 118 is inserted between the flange surface 116 and the thrust surface 117 of the bearing 114. A thrust bearing 119 is constituted by the flange surface 116, the thrust surface 117 and the thrust washer 118.

  The piston 115 is loosely fitted in the bore 113 while maintaining a certain amount of clearance, is made of an iron-based material, and forms a compression chamber 120 together with the bore 113. Further, the piston 115 is connected to the eccentric shaft 110 by a connecting rod 122 as connecting means via a piston pin 121. The end face of the bore 113 is sealed with a valve plate 123.

  The head 124 forms a high-pressure chamber. The head 124 is fixed to the valve plate 123 on the side opposite to the bore 113. The suction tube (not shown) is fixed to the closed vessel 101 and connected to the low pressure side (not shown) of the refrigeration cycle, and guides the refrigerant gas 102 into the closed vessel 101. The suction muffler 125 is sandwiched between the valve plate 123 and the head 124.

  The cluster 127 is connected to the stator 104 constituting the electric element 106 via a lead wire 126. Further, the sealed container 101 is provided with a terminal 128 penetrating the inside and outside of the sealed container 101. The cluster 127 is connected to the terminal 128. As a result, electric power is supplied to the electric element 106 from a commercial power supply (not shown).

  The type of the refrigerant gas 102 used in the refrigerant compressor 100 according to the present disclosure is not particularly limited, but the above-described hydrocarbon-based refrigerant is preferably used. Specific examples of the hydrocarbon-based refrigerant include, but are not particularly limited to, R290 (propane), R600a (isobutane), R600 (butane), and R1270 (propylene). Representative hydrocarbon-based refrigerants include R600a or R290.

  Further, in the refrigerant compressor 100 according to the present disclosure, as described later, the lubricating oil 103 having a low viscosity and a high flash point is used. As described above, the lubricating oil 103 is a mixed oil of mineral oil and synthetic oil. is there. The refrigerant gas 102 is used in a refrigerant circuit (refrigeration cycle, see Embodiment 2) including the refrigerant compressor 100, and exists in the closed vessel 101 in a state where the refrigerant gas 102 and the lubricating oil 103 can be in contact with and mixed with each other. . Therefore, the refrigerant gas 102 and the lubricating oil 103 can be regarded as constituting a refrigeration cycle working medium. The working medium for a refrigeration cycle may include other components in addition to the refrigerant component and the lubricating oil component.

  Here, in the refrigerant compressor 100 according to the present disclosure, a resin member is included in the configuration accommodated in the closed casing 101. The resin member is not particularly limited as long as the member is at least made of a resin, that is, a polymer. Typically, for example, a suction muffler 125, an insulating member attached to the electric element 106, a cluster 127, and the like can be given.

  These resin members may be composed of only a resin (polymer), but may be, for example, a composite material containing a different material such as a fiber material or a filler in addition to the resin. For example, as the cluster 127, a member formed of a polyester resin containing glass fiber can be used. Similarly, the suction muffler 125 can be a member formed of a polyester resin containing glass fiber.

  The resin (polymer) constituting the resin member is not particularly limited, but specifically, for example, a polyester-based resin such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT), polyamide (PA), polyphenylene sulfide ( PPS), liquid crystal polymer (or liquid crystal polyester, LCP) and the like. Since these resins are excellent in heat resistance, refrigerant resistance, oil resistance, and the like, they are preferably used as a material of a resin member housed in the closed container 101. The resin material constituting the resin member may be one kind of resin, but a polymer alloy (polymer blend) in which two or more kinds are appropriately combined may be used. In addition, the resin constituting the resin member may include a known additive.

  As described above, examples of the heterogeneous material included in the resin member include a fiber material and a filler. Examples of the fiber material include, but are not particularly limited to, aramid fiber, nylon fiber, polyester fiber, glass fiber, and carbon fiber. One of these fiber materials may be used alone, or two or more of them may be used in appropriate combination. The filler may be in the form of particles or powder, but may be in the form of short fibers. Fiber materials may be considered fillers. Specific fillers include, but are not particularly limited to, inorganic fillers such as silica, silicates, clays, gypsum, alumina, titanium dioxide, talc, and carbon black.

  An example of the operation of the refrigerant compressor 100 according to the present disclosure having such a configuration will be described. First, electric power is supplied from a commercial power supply (not shown) to the electric element 106 via the terminal 128 and the cluster 127, whereby the rotor 105 of the electric element 106 rotates. The rotor 105 rotates the crankshaft 108, and the eccentric motion of the eccentric shaft 110 drives the piston 115 from the connecting rod 122 of the connecting means via the piston pin 121.

  The piston 115 reciprocates in the bore 113, sucks the refrigerant gas 102 guided into the closed container 101 through the suction tube (not shown) from the suction muffler 125, and compresses the refrigerant gas 102 in the compression chamber 120. The lubricating oil 103 is supplied to each sliding portion from the oil supply pump 111 with the rotation of the crankshaft 108, lubricates the sliding portion, and controls a seal between the piston 115 and the bore 113.

[Composition of lubricating oil]
In recent years, in order to achieve higher efficiency, measures such as using a lubricant having a lower viscosity as the lubricating oil 103 have been taken. In the present disclosure, the lubricating oil 103 used in the refrigerant compressor 100 is a mixed oil composed of at least a mineral oil and a synthetic oil as described above. The lubricating oil 103 (mixed oil) is a kinematic viscosity at 40 ° C. in the range of 0.1mm ² /s~5.1mm ² / s, a relatively lower viscosity than the prior art. Moreover, the lubricating oil 103 has a flash point of 110 ° C. or higher.

  The lubricating oil 103 according to the present disclosure has a mineral oil as a main component and a synthetic oil as a sub-component, and may contain components other than these. Therefore, the lubricating oil 103 according to the present disclosure is a lubricating oil composition containing a mineral oil and a synthetic oil. The content (content) of the mineral oil contained in the lubricating oil 103 is not particularly limited, and may be any content as long as it can be determined as the “main component” when the lubricating oil 103 (lubricating oil composition) is viewed as a whole. Further, the content (content rate) of the synthetic oil contained in the lubricating oil 103 is not particularly limited, and the “subcomponent” having a lower content than the mineral oil when viewed as the lubricating oil 103 (lubricating oil composition) as a whole. Content may be sufficient.

  When the total amount of the lubricating oil 103 is regarded as 100% by weight, the content of the synthetic oil as an accessory component may be, for example, in the range of 0.1 to 40.0% by weight, and is 1 to 35% by weight. % Can be mentioned as a preferable example, and a range of 5 to 25% by weight can be mentioned as a more preferable example. Further, the content of the mineral oil as the main component in the lubricating oil 103 may be larger than that of the synthetic oil. For example, as described above, when the content of the synthetic oil is 40.0% by weight or less of the total amount of the lubricating oil 103, the content of the mineral oil may be more than 40.0% by weight of the total amount of the lubricating oil 103. For example, it may be 50% by weight or more.

  In the present disclosure, a synthetic oil is blended (blended) with mineral oil so that the lubricating oil 103 does not simply lower the viscosity, but also does not lower the flash point of the lubricating oil 103. Therefore, by setting the content of the synthetic oil within the above range, the lower limit of the kinematic viscosity and the flash point of the lubricating oil 103 can be easily adjusted to the above numerical ranges.

  The types of the mineral oil and the synthetic oil constituting the lubricating oil 103 are not particularly limited. The mineral oil generally includes a paraffinic mineral oil and a naphthenic mineral oil. In the present disclosure, any of these mineral oils may be used, or a mixture of these mineral oils may be used. Further, a plurality of types of paraffinic mineral oils having different physical properties may be used in combination, similarly, a plurality of types of naphthenic mineral oils having different physical properties may be used in combination, or a combination of different paraffinic mineral oils and a different naphthenic mineral oil may be used. You may mix and use with the combination of system mineral oil.

  Specific examples of the synthetic oil include, but are not particularly limited to, polyalphaolefin oil, alkylbenzene oil, ester oil, ether oil, polyalkylene glycol oil, fluorine-based synthetic oil, and silicon-based synthetic oil. One of these synthetic oils may be selected and blended with the mineral oil, or a plurality of them may be blended with the mineral oil.

  Among these, in the present disclosure, it is particularly preferable to use at least one selected from the group consisting of an ester oil, an ether oil, a polyalkylene glycol oil, and an alkylbenzene oil. By blending at least one of these synthetic oils with mineral oil, the lower limit of the kinematic viscosity and the flash point of the lubricating oil 103 can be easily adjusted to the above numerical ranges. In addition, depending on the type of the synthetic oil, it is possible to give the lubricating oil 103 properties other than the above-described lower limits of the kinematic viscosity and the flash point. For example, by selecting an ester oil having polarity as a synthetic oil and blending it with a mineral oil, it becomes possible to impart polarity to the lubricating oil 103.

In the present disclosure, by producing lubricating oil 103 is mixed at least mineral and synthetic oils, as described above, the kinematic viscosity at 40 ° C. in the range of 0.1mm ² /s~5.1mm ² / s At the same time, the flash point was adjusted to 110 ° C or higher. Here, although the kinematic viscosity at 40 ° C. of the lubricating oil 103 is not particularly limited as long as it is within the scope of the, for example, it is mentioned within the scope of 0.1mm ² /s~4.5mm ² / s As a preferable example A preferable example is a range of 0.1 mm ² / s or more and less than 3.0 mm ² / s. The kinematic viscosity in the present disclosure is measured based on JIS K2283.

When the kinematic viscosity at 40 ° C. of the lubricating oil 103 exceeds 5.1 mm ² / s, the lubricating oil 103 does not have a lower viscosity, and the effect of increasing the efficiency by the lower viscosity cannot be sufficiently obtained. . On the other hand, if the kinematic viscosity at 40 ° C. is less than 0.1 mm ² / s, the lubricating effect as the lubricating oil 103 may not be sufficiently obtained.

  Similarly, in the present disclosure, the lower limit of the flash point of the lubricating oil 103 is not particularly limited as long as it is 110 ° C. or higher, but, for example, 120 ° C. or higher can be cited as a preferable example, and 150 ° C. or higher as a more preferable example. Can be mentioned. The flash point in the present disclosure is measured based on JIS K2265. If the lower limit of the flash point of the lubricating oil 103 is less than 110 ° C., more strict attention must be paid to fire when handling the lubricating oil 103, and the viscosity may increase with time if special storage conditions are not satisfied. There is. Therefore, the handleability of the lubricating oil 103 decreases.

Specifically, if the flash point of the lubricating oil 103 decreases, the amount of low-distillation components contained in the lubricating oil 103 increases. Therefore, when stored under normal conditions, the low-distilled components contained in the lubricating oil 103 may evaporate first and the viscosity may increase with time. The general lubricating oil 103 is stored under low vacuum and high temperature conditions, for example, in an atmosphere of 10 ⁻² Pa and a temperature range of 40 to 60 ° C. If the flash point of the lubricating oil 103 is low, such a low vacuum In addition, under high temperature conditions, the low-distilled components evaporate and the viscosity increases with time. Therefore, special storage conditions using a chemical filter are required.

  Here, it is more preferable that the lubricating oil 103 satisfies not only the range of the kinematic viscosity at 40 ° C. and the lower limit of the flash point but also a predetermined distillation characteristic. Specifically, the lubricating oil 103 according to the present disclosure preferably has a distillation characteristic in a distillation range of 200 to 400 ° C (that is, a distillation characteristic in which the initial boiling point is 200 ° C and the end point is 400 ° C). The distillation characteristics in the present disclosure are measured based on JIS K2254.

  Mineral oil is basically a mixture of many types of oils and therefore has a wide range of distillation characteristics, but synthetic oils are basically composed of a single type (or several types) of synthesized compounds. The distillation characteristics are specified at one point (or several points). Therefore, by blending the synthetic oil with the mineral oil, the distillation characteristics of the lubricating oil 103, which is a mixed oil, can be adjusted to the above-described distillation range. If necessary, the mineral oil may be refined so as to be within the above-mentioned distillation range.

  In the present disclosure, if the lubricating oil 103 satisfies the above-mentioned conditions of the distillation characteristics in addition to the basic conditions of the range of the kinematic viscosity at 40 ° C. and the lower limit of the flash point, the low distillation The components can be smaller. Therefore, the tendency of lowering the flash point of the lubricating oil 103 can be more effectively suppressed, and the stability of the lubricating oil 103 can be improved. As a result, the handleability of the lubricating oil 103 can be further improved.

  As described above, the lubricating oil 103 according to the present disclosure is a lubricating oil composition including a mineral oil and a synthetic oil, and may include components other than the mineral oil and the synthetic oil. Specific other components include various additives known in the field of the lubricating oil 103.

  Specific additives are not particularly limited, and include, for example, at least one of an extreme pressure additive, an oil agent, an antifoaming agent, and a stabilizer. By adding these additives to the mixed oil of the mineral oil and the synthetic oil, the properties of the lubricating oil 103 can be improved, and the reliability of the refrigerant compressor 100 can be improved.

  The amount (content) of these additives is not particularly limited, but in the present disclosure, any of the additives is added in a range of 0.1 to 4.0% by weight of the total amount of the lubricating oil 103. Good. If the content of the additive is less than 0.1% by weight of the total amount of the lubricating oil 103, depending on the type of the additive, the amount of the additive may be too small and the effect of the additive may not be sufficiently obtained. On the other hand, when the content of the additive exceeds 4.0% by weight of the total amount of the lubricating oil 103, depending on the type of the additive, not only the effect of the additive corresponding to the amount of addition is not obtained, but also When the content of the additive becomes excessive, the other physical properties of the lubricating oil 103 may be affected.

  In the present disclosure, stabilizers can be mentioned as typical additives. By adding the stabilizer, the physical properties of the lubricating oil 103 having a low viscosity and a high flash point can be satisfactorily stabilized. In the present disclosure, stabilizers can include acid scavengers or fullerenes.

  The acid scavenger is used to prevent the base oil (mixed oil composed of mineral oil and synthetic oil) from deteriorating due to water or oxygen and increasing the acid value. By suppressing the deterioration of the mixed oil as the base oil by adding the acid scavenger, the kinematic viscosity at 40 ° C. of the lubricating oil 103 can be effectively suppressed from falling outside the above range.

  The specific type of the acid scavenger is not particularly limited, and a known one can be suitably used. Further, fullerene has an action of suppressing a decrease in the flash point of the lubricating oil 103, and thus can be used as a "flash point lowering inhibitor". Therefore, the flash point of the lubricating oil 103 can be more effectively suppressed by adding fullerene.

  As described above, the amount of the acid scavenger and / or fullerene that is a stabilizer may be in the range of 0.1 to 4.0% by weight based on the total amount of the lubricating oil 103. By adjusting the addition amount (content) of these stabilizers within the above range, the properties of the lubricating oil 103 can be improved with an appropriate amount of stabilizer, so that the reliability of the refrigerant compressor 100 is further improved. can do.

As described above, in the refrigerant compressor 100 according to the present disclosure, the electric element 106 and the compression element 107 and the like are housed in the closed casing 101 and the lubricating oil 103 is stored. This lubricating oil 103 is at least a mineral oil and a synthetic oil. in a constructed mixed oil is in a range kinematic viscosity of 0.1mm ² /s~5.1mm ² / s at its 40 ° C., and is flash point 110 ° C. or higher.

  Such a lubricating oil 103 has a kinematic viscosity within the above range when blending a mineral oil and a synthetic oil with a base oil being a mixed oil with a synthetic oil as well as a mineral oil, and having a flash point of Is adjusted so that the lower limit of the above becomes the above value. As a result, the lubricating oil 103 having a low viscosity and a high flash point can be obtained, so that a decrease in the handleability of the lubricating oil 103 can be effectively suppressed. Therefore, by using such a lubricating oil 103, not only the efficiency of the refrigerant compressor 100 can be increased, but also good productivity can be realized even if the lubricating oil 103 having a lower viscosity is used.

  In the first embodiment, the refrigerant compressor 100 has a configuration in which the electric element 106 is disposed above the compression element 107. However, in the refrigerant compressor according to the present disclosure, the electric element 106 is compressed. It goes without saying that it may have a configuration arranged below the element 107. If the refrigerant compressor to which the present disclosure can be applied has a configuration in which the above-described lubricating oil 103 can be used, the same operation and effect as those described in the first embodiment can be obtained.

  Further, in the first embodiment, the refrigerant compressor 100 is a reciprocating type (reciprocating type) as described above, but the refrigerant compressor according to the present disclosure is not limited to the reciprocating type, and may be a rotary type or a scroll type. Needless to say, other known configurations such as a vibration type and the like may be used. If the refrigerant compressor to which the present disclosure can be applied has a configuration in which the above-described lubricating oil 103 can be used, the same operation and effect as those described in the first embodiment can be obtained.

  Furthermore, in the first embodiment, the refrigerant compressor 100 is driven by a commercial power supply. However, the refrigerant compressor according to the present disclosure is not limited to this. May be performed. Even if the refrigerant compressor has such a configuration, good lubricity can be realized by using the lubricating oil 103 described above. Therefore, the reliability of the refrigerant compressor can be improved even during a low-speed operation in which the amount of oil supplied to each sliding portion is small, or in a high-speed operation in which the number of rotations of the electric element is increased.

(Embodiment 2)
In the second embodiment, an example of a refrigeration apparatus including the refrigerant compressor 100 described in the first embodiment will be specifically described with reference to FIG. FIG. 2 schematically shows a schematic configuration of a refrigeration apparatus 200 including the refrigerant compressor 100 according to the first embodiment. Therefore, in the second embodiment, only an outline of the basic configuration of the refrigeration apparatus 200 will be described, but it goes without saying that the specific configuration of the refrigeration apparatus 200 is not limited to this.

  As shown in FIG. 2, a refrigeration apparatus 200 according to Embodiment 2 includes a main body 206, a partition wall 209, a refrigerant circuit 201 (refrigeration cycle), and the like. The main body 206 includes a heat-insulating box, a door, and the like. The box has a configuration in which one surface is opened, and the door is configured to open and close an opening of the box. The inside of the main body 206 is partitioned by a partition wall 209 into a storage space 207 for articles and a machine room 208. In the storage space 207, a blower (not shown) is provided. The inside of the main body 206 may be partitioned into a space other than the storage space 207 and the machine room 208.

  The refrigerant circuit 201 (refrigeration cycle) is configured to cool the inside of the storage space 207. For example, the refrigerant circuit 100, the radiator 202, the pressure reducing device 203, and the heat absorber 204 described in the first embodiment. And these are connected in a ring by a pipe 205. The heat absorber 204 is arranged in the storage space 207. The heat of cooling of the heat absorber 204 is agitated by a blower (not shown) so as to circulate in the storage space 207, as indicated by a broken arrow in FIG. Thereby, the inside of the storage space 207 is cooled.

  As described above, the refrigeration apparatus 200 according to Embodiment 2 includes the refrigerant circuit 201 including the refrigerant compressor 100 according to Embodiment 1. As described in the first embodiment, since the refrigerant compressor 100 uses the lubricating oil 103 having a low viscosity and a high flash point, the refrigerant compressor 100 is highly efficient. Therefore, since the refrigeration apparatus 200 according to Embodiment 2 can reduce power consumption, energy saving can be realized and reliability can be improved.

  The refrigeration apparatus 200 described in the second embodiment is an example of a refrigeration apparatus according to the present disclosure (a refrigeration apparatus including a refrigerant compressor according to the present disclosure), and the present disclosure is not limited to the refrigeration apparatus 200. Needless to say. Examples of the refrigeration apparatus according to the present disclosure include a refrigerator (for home use and business use), a dehumidifier, a showcase, an ice maker, a heat pump water heater, a heat pump washing and drying machine, a vending machine, and an air conditioner. Can be.

  It should be noted that the present invention is not limited to the description of the above embodiments, and various changes can be made within the scope of the claims, and the present invention is disclosed in different embodiments and a plurality of modified examples. Embodiments obtained by appropriately combining the technical means described above are also included in the technical scope of the present invention.

  From the above description, many modifications and other embodiments of the present invention are obvious to one skilled in the art. Accordingly, the above description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the invention. Details of its structure and / or function may be substantially changed without departing from the spirit of the invention.

  INDUSTRIAL APPLICABILITY The present invention can be widely and suitably used in the field of a refrigerant compressor using a low-viscosity lubricating oil and a refrigeration apparatus using such a refrigerant compressor.

DESCRIPTION OF SYMBOLS 100 Refrigerant compressor 101 Airtight container 102 Refrigerant gas 103 Lubricating oil 104 Stator 105 Rotor 106 Electric element 107 Compression element 200 Refrigeration device 201 Refrigerant circuit 202 Radiator 203 Decompression device 204 Heat absorber 205 Piping

Claims (7)

It is housed in a closed container, comprising a compression element for compressing a refrigerant, and an electric element for driving the compression element, and lubricating oil is stored in the closed container,
The lubricating oil is a mixed oil composed of at least a mineral oil and a synthetic oil,
Kinematic viscosity at 40 ° C. is in the range of 0.1mm ² /s~5.1mm ² / s, and wherein the flash point is 110 ° C. or higher,
Hermetic refrigerant compressor. The content of the synthetic oil in the lubricating oil is in the range of 0.1 to 40.0% by weight of the total amount of the lubricating oil,
The hermetic refrigerant compressor according to claim 1. The synthetic oil is at least one selected from the group consisting of ester oil, ether oil, polyalkylene glycol oil, and alkylbenzene oil,
The hermetic refrigerant compressor according to claim 1. The lubricating oil further comprises an extreme pressure additive, an oil agent, an antifoaming agent and at least one additive of a stabilizer,
The hermetic refrigerant compressor according to any one of claims 1 to 3. The content of the additive is in the range of 0.1 to 4.0% by weight of the total amount of the lubricating oil,
The hermetic refrigerant compressor according to claim 4. The lubricating oil is characterized in that the distillation range has a distillation characteristic of 200 to 400 ° C.,
The hermetic refrigerant compressor according to any one of claims 1 to 5.   A refrigeration apparatus comprising the hermetic refrigerant compressor according to any one of claims 1 to 6.

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