JP4932793B2 - Refrigeration cycle equipment - Google Patents

Description

  This invention relates to a halogenated hydrocarbon having a carbon double bond in the composition, a hydrocarbon having a carbon double bond in the composition, a halogenated hydrocarbon having a carbon double bond in the composition, or The present invention relates to a refrigeration cycle apparatus that uses any of a mixture containing at least one of hydrocarbons having a carbon double bond as a refrigerant.

In the field of car air conditioners, the current status is HFO-1234yf (CF ₃ CF = CH ₂ ) as a low GWP (global warming potential) refrigerant.

  In stationary refrigeration cycle devices (for example, air conditioners), there are currently no alternatives to HFC refrigerants, but they are made nonflammable based on hydrocarbons or HFCs with carbon double bonds ( For example, a compound having a double bond, a combination of bromine, iodine, oxygen, or the like) has been proposed.

  A hermetic refrigerant compressor containing a compressor that compresses a refrigerant of a hydrocarbon compound that does not contain chlorine and fluorine, an electric motor that drives the compressor, and a refrigerating machine oil that is compatible with the refrigerant in a hermetic container , A linear PPS resin, a resol type phenolic resin, a fluororesin that contains an internal mold release agent of 5 wt% or less, or is manufactured by applying a mold release agent to a mold during injection molding or extrusion molding (PTFE, ETFE, FEP, PFA), at least one of an insulating structural member selected from the group of PA resin, PI resin, PBT resin, and PET resin and a sliding member, and a hydrocarbon R170 (ethane), R290 (propane), R600 (n-butane), R600a (I-butane), R1150 (ethylene) R1270 consisting of one or more refrigerants selected from the group of (propylene) sealed electric compressor has been proposed (e.g., see Patent Document 1).

In addition, in order to sufficiently suppress the influence on global warming by adapting the compressor to a low GWP refrigerant of GWP 150 or less, the sliding member is made of a material in which hard particles are dispersed in a soft base material. By providing an inclined layer on the surface layer portion of the sliding member to make the surface rich with a soft base material, the oil film forming ability is increased, and the sliding member wears in a refrigerant atmosphere having a GWP of 150 or less and a polarity higher than R134a. Since it can suppress enough, the compressor for low GWP refrigerant | coolants is obtained. The refrigerant may be higher in polarity than R134a and GWP is 150 or less, and may be incombustible based on HFC, such as a compound having a double bond, bromine, iodine, oxygen, or the like. Good. Further, it has been proposed that at least one of the mixed refrigerants may have a higher polarity than R134a (see, for example, Patent Document 2).
JP 2000-274360 A JP 2008-2368 A

  A substance having a carbon double bond has a problem in stability, and there is a possibility of decomposition and polymerization.

  A substance having a carbon double bond is used as a refrigerant, and includes an outdoor unit having a compressor, an outdoor heat exchanger, a decompression mechanism, and the like, and an indoor unit having an indoor heat exchanger, and the like. In a refrigeration cycle apparatus that forms a refrigeration cycle by connecting refrigerant pipes, when moisture such as rain enters the refrigeration cycle from the refrigerant pipe during installation, the refrigerant becomes a catalyst and decomposes the refrigerant that has a carbon double bond. There are concerns and measures to control this are necessary.

  In addition, when the compressor used in the refrigeration cycle apparatus is a positive displacement type, there is a concern of decomposition and polymerization of a substance having a carbon double bond in the sliding portion of the compression mechanism, and measures to suppress these are necessary. is there.

  In Patent Documents 1 and 2, there is no mention of these points.

  The present invention has been made to solve the above-described problems. Even if water molecules are mixed in a refrigeration cycle in which a substance having a carbon double bond is used as a refrigerant, refrigeration with a high saturated water content is achieved. An object of the present invention is to provide a refrigeration cycle apparatus capable of suppressing the catalytic action of water molecules on the refrigerant by the intermolecular force of the machine oil and suppressing the decomposition of the refrigerant.

  Another object of the present invention is to provide a refrigeration cycle apparatus capable of suppressing the metal of the sliding portion in the compression mechanism of the positive displacement compressor from becoming a catalyst for decomposition and polymerization of a substance having a carbon double bond. And

  Furthermore, it aims at providing the refrigerating-cycle apparatus with high reliability of a compressor by employ | adopting refrigerating machine oil with a high extreme pressure effect | action.

The refrigeration cycle apparatus according to the present invention includes an outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, a pressure reduction mechanism, and the like, and an indoor unit having an indoor heat exchanger, and the like. In the refrigeration cycle device that forms the refrigeration cycle by connecting the refrigerant piping of the machine,
In the refrigerant, a halogenated hydrocarbon having a carbon double bond in the composition, a hydrocarbon having a carbon double bond in the composition, a halogenated hydrocarbon having a carbon double bond in the composition, or in the composition Using a mixture containing at least one of hydrocarbons having a carbon double bond,
A first refrigerating machine oil having a saturated water content of less than 200 ppm and a second refrigerating machine oil having a saturated water content of 2000 ppm or more are enclosed in the compressor.

  The rotary compressor according to the present invention includes a halogenated hydrocarbon having a carbon double bond in the composition, a hydrocarbon having a carbon double bond in the composition, and a halogenated carbon having a carbon double bond in the composition. Even in the case of using a refrigerant that is a mixture containing at least one of hydrogen or a hydrocarbon having a carbon double bond in the composition, the compressor is provided with a first refrigerating machine oil having a saturated moisture content of less than 200 ppm, and saturated moisture By enclosing the second refrigerating machine oil of 2000 ppm or more, even if water molecules are mixed in the refrigerating cycle, the water molecules can act on the refrigerant by the intermolecular force of the refrigerating machine oil having a high saturated water content. It is possible to suppress the decomposition of the refrigerant.

Embodiment 1 FIG.
First, the refrigerant targeted in this embodiment will be described. The refrigerants targeted in this embodiment are as follows.
(1) Halogenated hydrocarbon having a carbon double bond in its composition: For example, HFO-1234yf (CF ₃ CF═CH ₂ ) which is regarded as a low GWP (global warming potential) refrigerant in the field of car air conditioners ). HFO is an abbreviation for Hydro-Fluoro-Olefin, and Olefin is an unsaturated hydrocarbon having one double bond. The GFO of HFO-1234yf is 4.
(2) Hydrocarbon having a carbon double bond in the composition: for example, R1270 (propylene). GWP is 3, which is smaller than HFO-1234yf, but flammability is larger than HFO-1234yf.
(3) A mixture containing at least one of a halogenated hydrocarbon having a carbon double bond in the composition or a hydrocarbon having a carbon double bond in the composition: for example, a mixture of HFO-1234yf and R32 is there. Since HFO-1234yf is a low-pressure refrigerant, the pressure loss increases, and the performance of the refrigeration cycle (especially in an evaporator) is likely to deteriorate. Therefore, a mixture with R32 or R41, which is a high-pressure refrigerant, is more practical than HFO-1234yf.

  Although it has already been described that a substance having a carbon double bond in the composition has a problem in stability and there is a possibility of decomposition and polymerization, a little more explanation will be given by taking HFO-1234yf as an example.

  A substance having a double bond has the possibility of decomposition and polymerization, and generally the conditions for the polymerization are high temperature, high pressure and a catalyst. Those having a larger proportion of the number of fluorine atoms instead of hydrocarbons may be more easily polymerized. For example, Roy J. Plunkett (June 26, 1910-May 12, 1994, an American chemist), in 1938, introduced tetrafluoroethylene (four hydrogens of ethylene into fluorine). It was discovered that all of them had undergone a polymerization reaction spontaneously in a cylinder, and a fluororesin was produced by chance.

  HFO-1234yf is one in which four of the six hydrogen atoms of propylene are replaced by fluorine, and it is considered that the possibility of polymerization by a mechanochemical reaction or the like is considerably high. The mechanochemical reaction is a chemical reaction that occurs when the target substance is activated (mechanochemical activity) by applying mechanical energy such as impact or friction to the target substance.

  Hereinafter, the structure of the air conditioner which is an example of a refrigeration cycle apparatus will be described.

  FIG. 1 is a diagram showing Embodiment 1 and is a refrigerant circuit diagram of an air conditioner. As shown in FIG. 1, the air conditioner includes an outdoor unit 41 and an indoor unit 42.

  The outdoor unit 41 includes a compressor 43 that compresses the refrigerant, a four-way valve 44 that switches the refrigerant flow path, an outdoor heat exchanger 45, and an electronic expansion valve 46 (an example of a decompression mechanism) that controls the flow rate of the refrigerant. The outdoor heat exchanger 45 has an outdoor blower 45a.

  The refrigerant may be a halogenated hydrocarbon having a carbon double bond in the composition, a hydrocarbon having a carbon double bond in the composition, a halogenated hydrocarbon having a carbon double bond in the composition, or Any mixture containing at least one of hydrocarbons having a carbon double bond is used.

  A positive displacement compressor is used as the compressor 43 for compressing the refrigerant. The positive displacement compressor is, for example, a rotary compressor, a scroll compressor, a screw compressor, a reciprocating compressor, or the like. The compressor 43 is of a type in which the rotation speed is controlled by an inverter circuit and the capacity is controlled.

  The indoor unit 42 includes an indoor heat exchanger 48. The indoor heat exchanger 48 has an indoor blower 48a.

  The outdoor unit 41 and the indoor unit 42 are connected by a liquid pipe 47 and a gas pipe 49 that are refrigerant flow paths to constitute a refrigeration cycle.

  In FIG. 1, in the cold supply mode (cooling operation) in which cold heat is supplied from the indoor heat exchanger 48, the four-way valve 44 is a solid flow path, and the hot heat supply mode (heating operation) in which hot heat is supplied from the indoor heat exchanger 48. Then, the four-way valve 44 is switched to the dotted flow path.

  Therefore, in the cold heat supply mode, the compressor 43, the four-way valve 44, the outdoor heat exchanger 45, the electronic expansion valve 46, the liquid pipe 47, the indoor heat exchanger 48, the gas pipe 49, and the compressor 43 are connected in an annular shape in this order. The

  In the heat supply mode, the compressor 43, the four-way valve 44, the gas pipe 49, the indoor heat exchanger 48, the liquid pipe 47, the electronic expansion valve 46, the outdoor heat exchanger 45, and the compressor 43 are annularly connected in this order. .

  The electronic expansion valve 46 has a structure in which the throttle opening is variable.

  The outdoor heat exchanger 45 exchanges heat with the air around the outdoor unit 41 conveyed by the outdoor blower 45a.

  The indoor heat exchanger 48 exchanges heat with the air around the indoor unit 42 conveyed by the indoor blower 48a, and realizes cooling and heating by cooling and heating the indoor space.

  The liquid pipe 47 and the gas pipe 49 are shipped as separate parts when shipped from the factory. At the time of installation of the air conditioner, the liquid pipe 47 and the gas pipe 49 are connected to the outdoor unit 41 and the indoor unit 42 at the site.

  Therefore, in the operation of connecting the liquid pipe 47 and the gas pipe 49 to the outdoor unit 41 and the indoor unit 42 when installing the air conditioner, water such as rain may be mixed into the refrigerant circuit (refrigeration cycle).

  Next, the positive displacement compressor will be described by taking a rotary compressor as an example.

  2 and 3 show the first embodiment, FIG. 2 is a longitudinal sectional view of the rotary compressor 200, and FIG. 3 is a sectional view taken along line AA of FIG.

  The present embodiment is characterized by the configuration of the refrigerating machine oil 30 sealed in the rotary compressor 200 and each sliding portion. Therefore, since the entire configuration of the rotary compressor 200 is a known one, it will be briefly described.

  An example of the rotary compressor 200 shown in FIG. 1 is a vertical type in which the inside of the sealed container 20 is high pressure. The compression element 101 is housed in the lower part of the sealed container 20. The electric element 102 that drives the compression element 101 is accommodated above the compression element 101 in the upper part of the sealed container 20.

  Refrigerating machine oil 30 that lubricates each sliding portion of the compression element 101 (compression mechanism) is stored at the bottom of the sealed container 20.

  First, the configuration of the compression element 101 will be described. The cylinder 1 in which the compression chamber is formed has a cylinder chamber 1b whose outer periphery is substantially circular in a plan view and is a space that is substantially circular in a plan view. The cylinder chamber 1b is open at both axial ends. The cylinder 1 has a predetermined axial height in a side view.

  A parallel vane groove 1 a that communicates with a cylinder chamber 1 b that is a substantially circular space in a plan view of the cylinder 1 and extends in the radial direction is provided so as to penetrate in the axial direction.

  Further, a back pressure chamber 1c, which is a substantially circular space in plan view, communicating with the vane groove 1a is provided on the back surface (outside) of the vane groove 1a.

  A suction port (not shown) through which suction gas from the refrigeration cycle passes through the cylinder 1 passes through the cylinder chamber 1 b from the outer peripheral surface of the cylinder 1.

  The cylinder 1 is provided with a discharge port (not shown) in which the vicinity of the edge (end surface on the electric element 102 side) of the circle forming the cylinder chamber 1b which is a substantially circular space in plan view is cut out.

  The material of the cylinder 1 is gray cast iron, sintered, carbon steel or the like.

  The rolling piston 2 rotates eccentrically in the cylinder chamber 1b. The rolling piston 2 has a ring shape, and the inner periphery of the rolling piston 2 is slidably fitted to the eccentric shaft portion 6 a of the crankshaft 6.

  It is assembled so that there is always a constant gap between the outer periphery of the rolling piston 2 and the inner wall of the cylinder chamber 1b of the cylinder 1.

  The material of the rolling piston 2 is alloy steel containing chromium or the like.

  The vane 3 is accommodated in the vane groove 1a of the cylinder 1, and the vane 3 is always pressed against the rolling piston 2 by the vane spring 8 provided in the back pressure chamber 1c. Since the rotary compressor 200 has a high pressure inside the sealed container 20, when the operation is started, the force due to the differential pressure between the high pressure in the sealed container 20 and the pressure in the cylinder chamber 1b on the back surface of the vane 3 (on the back pressure chamber 1c side). Therefore, the vane spring 8 is used mainly for the purpose of pressing the vane 3 against the rolling piston 2 when the rotary compressor 200 is activated (the pressure in the sealed container 20 and the cylinder chamber 1b is not different). .

  The shape of the vane 3 is a flat shape (the thickness in the circumferential direction is smaller than the length in the radial direction and the axial direction).

  As the material of the vane 3, high-speed tool steel, stainless steel, or the like is mainly used.

  The main bearing 4 is slidably fitted to a main shaft portion 6b (a portion above the eccentric shaft portion 6a) of the crankshaft 6, and one end face of the cylinder chamber 1b (including the vane groove 1a) of the cylinder 1 ( The electric element 102 side) is closed.

  The main bearing 4 includes a discharge valve (not shown). However, it may be attached to either one or both of the main bearing 4 and the sub-bearing 5.

  The main bearing 4 has a substantially inverted T shape when viewed from the side.

  The auxiliary bearing 5 is slidably fitted to the crankshaft 6 and the auxiliary shaft portion 6c (a portion below the eccentric shaft portion 6a), and the other end face of the cylinder chamber 1b (including the vane groove 1a) of the cylinder 1 (Refrigerating machine oil 30 side) is closed.

  The secondary bearing 5 is substantially T-shaped in a side view.

  The material of the main bearing 4 and the sub bearing 5 is the same as that of the cylinder 1, and is made of gray cast iron, sintered, carbon steel, or the like.

  A discharge muffler 7 is attached to the main bearing 4 on the outer side (electric element 102 side). The high-temperature and high-pressure discharge gas discharged from the discharge valve of the main bearing 4 enters the discharge muffler 7 at one end and is then discharged from the discharge muffler 7 into the sealed container 20. However, the discharge muffler 7 may be provided on the sub-bearing 5 side.

  A suction muffler 21 is provided on the side of the sealed container 20 to suck low-pressure refrigerant gas from the refrigeration cycle and prevent liquid refrigerant from being directly sucked into the cylinder chamber of the cylinder 1 when the liquid refrigerant returns. The suction muffler 21 is connected to the suction port of the cylinder 1 via the suction pipe 22. The main body of the suction muffler 21 is fixed to the side surface of the sealed container 20 by welding or the like.

  Next, the configuration of the electric element 102 will be described. The electric element 102 is a brushless DC motor, but may be an induction motor.

  The electric element 102 includes a stator 12 and a rotor 13. The stator 12 is fitted and fixed to the inner peripheral surface of the hermetic container 20, and the rotor 13 is disposed inside the stator 12 via a gap.

  The stator 12 is a stator core 12a manufactured by punching a magnetic steel sheet having a thickness of 0.1 to 1.5 mm into a predetermined shape, laminating a predetermined number of sheets in the axial direction, and fixing by caulking or welding, Three-phase windings 12b wound around a plurality of teeth (not shown) of the stator core 12a by a concentrated winding method are provided. The winding 12b is wound around the teeth portion via the insulating member 12c. The material of the winding 12b is a copper wire coated with a coating such as AI (amidoimide) / EI (ester imide). As the insulating member 12c, PET (polyethylene terephthalate), PBT (polybutylene terephthalate), FEP (tetrafluoroethylene / hexafluoropropylene copolymer (4.6 fluoride)), PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether) Copolymer), PTFE (polytetrafluoroethylene), LCP (liquid crystal polymer), PPS (polyphenylene sulfide), phenol resin, and the like are mainly used.

  A part of the winding 12b protrudes from both axial ends of the stator core 12a (upper and lower ends in the axial direction in FIG. 1). This protruding portion is called a coil end. A portion indicated by reference numeral (12b) in FIG. 1 is a coil end on one side (the anti-compression element 101 side) of the winding 12b. The lead wire 23 is connected to a terminal (not shown) attached to the insulating member 12c.

  On the outer periphery of the stator core 12a, notches (not shown) arranged at substantially equal intervals are provided at a plurality of locations. This notch is one of the paths of the discharge gas discharged from the discharge muffler 7 into the sealed container 20, and also serves as a path for the refrigerating machine oil 30 to return from the top of the electric element 102 to the bottom of the sealed container 20.

  The rotor 13 disposed inside the stator 12 via a gap (usually about 0.3 to 1 mm) is made of an electromagnetic steel plate having a thickness of 0.1 to 1.5 mm, similar to the stator core 12a. It is punched into a shape, laminated in a predetermined number of axial directions, and inserted into a rotor core 13a manufactured by fixing by caulking or welding and a permanent magnet insertion hole (not shown) formed in the rotor core 13a. A permanent magnet (not shown). For permanent magnets, ferrite or rare earth magnets are used.

  In order to prevent the permanent magnet inserted into the permanent magnet insertion hole from coming off in the axial direction, end plates are provided at both ends in the axial direction of the rotor 13 (upper and lower ends in the axial direction in FIG. 1). An upper end plate 13 b is provided at the upper end portion in the axial direction of the rotor 13, and a lower end plate 13 c is provided at the lower end portion in the axial direction of the rotor 13.

  The upper end plate 13b and the lower end plate 13c also serve as a rotation balancer. The upper end plate 13b and the lower end plate 13c are fixed by caulking together with a plurality of fixing rivets (not shown).

  The rotor core 13a is provided with a plurality of through-holes (not shown) penetrating in the substantially axial direction serving as a gas flow path for the discharge gas.

  A terminal 24 (referred to as a glass terminal) connected to a power source that is a power supply source is fixed to the sealed container 20 by welding. In the example of FIG. 1, the terminal 24 is provided on the upper surface of the sealed container 20. A lead wire 23 from the electric element 102 is connected to the terminal 24.

  A discharge pipe 25 having both ends opened is inserted into the upper surface of the sealed container 20. The discharge gas discharged from the compression element 101 is discharged from the sealed container 20 through the discharge pipe 25 to the external refrigeration cycle.

  When the electric element 102 is composed of an induction motor, electromagnetic steel sheets having a thickness of 0.1 to 1.5 mm are punched into a predetermined shape, laminated in a predetermined number of axes, and fixed by caulking or welding. A rotor core 13a manufactured in this manner, and a squirrel-cage winding in which a conductor formed of aluminum or copper is filled or inserted into a slot formed in the rotor core 13a and both ends of the conductor are short-circuited by end rings, Is provided.

  The refrigerating machine oil 30 stored in the bottom of the sealed container 20 is mainly composed of alkylbenzene (an example of a first refrigerating machine oil), and PVE (polyvinyl ether, an example of a second refrigerating machine oil) is about 20% by weight. Have been mixed.

  Alkylbenzene mainly lubricates the compression element 101. Alkylbenzene is a refrigerating machine oil having a high extreme pressure effect. Alkylbenzene has a saturated water content of less than 200 ppm. Therefore, PVE having a saturated water content of 2000 ppm or more is mixed in order to suppress the catalytic action of water molecules on the refrigerant and to suppress the decomposition of the refrigerant by the intermolecular force of the refrigerating machine oil having a high saturated water content.

  PVE does not have a molecular structure to hydrolyze.

  Hydrolysis is a reaction in which a reaction product reacts with water and decomposes into a product. At this time, water is taken into the product by being divided into H (proton component) and OH (hydroxide component).

  Even if water molecules are mixed in the refrigeration cycle, the intermolecular force of PVE having a saturated water content of 2000 ppm or more can suppress the catalytic action of water molecules on the refrigerant and suppress the decomposition of the refrigerant.

Filling the refrigeration cycle apparatus with alkylbenzene and PVE is performed by the following method.
(1) The rotary compressor 200 is filled with alkylbenzene, and the PVE is filled in portions other than the rotary compressor 200 of the refrigeration cycle apparatus. For example, when a receiver that stores liquid refrigerant is used, the PVE is filled in the receiver. Thus, the filling operation | work of refrigerating machine oil can be smoothly performed by filling the alkylbenzene and PVE in the different location of a refrigerating-cycle apparatus.
(2) However, it is also possible to fill the rotary compressor 200 with alkylbenzene and then fill the rotary compressor 200 with PVE.

  In addition to PVE, PAG (polyalkylene glycol) can also be used because it satisfies the above conditions (saturated water content is 2000 ppm or more).

  Moreover, you may provide a moisture capture | acquisition material in a refrigeration cycle apparatus instead of filling PVE and PAG. In particular, the moisture trapping material is preferably provided on the low pressure side of the refrigeration cycle apparatus. When a moisture trapping material is provided on the high pressure side, there is a concern that moisture will evaporate from the moisture trapping material.

  The moisture trapping material is composed of porous zeolite. Zeolite is a porous material with many cavities in the crystal. Depending on this special structure and its constituents, various materials can be incorporated into the crystal structure, Have the property of exchanging.

  A general operation of the rotary compressor 200 will be described. When electric power is supplied from the terminal 24 and the lead wire 23 to the stator 12 of the electric element 102, the rotor 13 rotates. Then, the crankshaft 6 fixed to the rotor 13 rotates, and accordingly, the rolling piston 2 rotates eccentrically in the cylinder chamber 1b of the cylinder 1. A space between the cylinder chamber 1 b of the cylinder 1 and the rolling piston 2 is divided into two by a vane 3. As the crankshaft 6 rotates, the volume of these two spaces changes. The volume gradually increases on one side, and the refrigerant is sucked from the suction muffler 21, while the volume gradually decreases on the other side. The refrigerant gas is compressed. The compressed discharge gas is discharged once from the discharge muffler 7 into the sealed container 20, passes through the electric element 102, and is discharged out of the sealed container 20 through the discharge pipe 25 on the upper surface of the sealed container 20.

  The discharge gas passing through the electric element 102 is disposed in a through hole of the rotor 13 of the electric element 102, a gap including a slot opening (not shown, also referred to as a slot opening) of the stator core 12a, and an outer periphery of the stator core 12a. Pass through the cutouts made.

When the rotary compressor 200 performs the above operation, there are a plurality of sliding portions where the components slide as shown below.
(1) First sliding portion: outer periphery 2a of rolling piston 2 and tip 3a (inner side) of vane 3;
(2) Second sliding portion: vane groove 1a of cylinder 1 and side surface portion 3b (both side surfaces) of vane 3;
(3) Third sliding part: the inner periphery 2b of the rolling piston 2 and the eccentric shaft part 6a of the crankshaft 6;
(4) Fourth sliding portion: inner periphery of main bearing 4 and main shaft portion 6b of crankshaft 6;
(5) Fifth sliding portion: the inner periphery of the auxiliary bearing 5 and the auxiliary shaft portion 6c of the crankshaft 6.

The parts constituting the sliding portion provided in the compression element 101 are collected.
(1) Cylinder 1;
(2) Rolling piston 2;
(3) Vane 3;
(4) Main bearing 4;
(5) Sub bearing 5;
(6) Crankshaft 6.

  Although not shown, when the drive shaft is driven, the protruding tip of the vane 3 provided integrally with the rolling piston 2 enters and exits along the receiving groove of the support, and at the same time, the support turns. That is, the vane 3 is a swing-type rotary compressor that always divides the inside of the cylinder chamber 1b into a compression chamber and a suction chamber by moving back and forth in the radial direction while swinging according to the revolution of the rolling piston 2. .

  In this swing type rotary compressor, the projecting tip of the vane 3 and the receiving groove of the support serve as a sliding part.

  In addition, a cylindrical holding hole is formed in an intermediate portion between the suction port and the discharge port of the cylinder 1, and the holding hole is configured by two semi-cylindrical members having a semicircular cross section. Since the body is rotatably fitted, the outer peripheral surface of the cylindrical support and the cylindrical holding hole of the cylinder serve as another sliding portion.

  In this embodiment, since a refrigerant having a carbon double bond in the composition is used as a refrigerant, a chemical reaction of the refrigerant is likely to occur as compared with a conventional refrigerant. In order to prevent this, the above-described sliding portions are configured to avoid direct contact between metals that easily generate high-temperature conditions and reaction catalysts.

  First, a carbon-based DLC-Si (diamond-like carbon-silicon) coating (an example of a non-metal) is applied to the surface of the vane 3 at the outer periphery of the rolling piston 2 that is the first sliding portion and the tip 3a of the vane 3. It has been applied. For this reason, the sliding between the outer periphery of the rolling piston 2 and the tip 3a of the vane 3 can avoid direct contact between metals, is not likely to be in a high temperature condition, and the metal surface is not easily activated. Decomposition and polymerization can be suppressed.

  The DLC-Si coating is amorphous carbon containing silicon, and has a surface hardness of 2000 to 2500 Hmv and a film thickness of 3 ± 1 μm.

  Also in the vane groove 1a of the cylinder 1 which is the second sliding portion and the side surface portion 3b of the vane 3, the surface of the vane 3 is coated with DLC-Si to avoid direct contact between metals. Since it is difficult to achieve high temperature conditions and the metal surface is not easily activated, decomposition and polymerization of the refrigerant can be suppressed.

  In the inner periphery 2b of the rolling piston 2, which is the third sliding portion, and the eccentric shaft portion 6a of the crankshaft 6, a manganese phosphate film (an example of a nonmetal) is formed on the surface of the crankshaft 6, thereby forming a metal Direct contact between each other can be avoided, the high temperature condition is unlikely to be activated, and the metal surface is not easily activated, so that decomposition and polymerization of the refrigerant can be suppressed. A manganese phosphate coating may be formed on the inner periphery 2b of the rolling piston 2.

  In the inner periphery of the main bearing 4 that is the fourth sliding portion, the main shaft portion 6b of the crankshaft 6, the inner periphery of the auxiliary bearing 5 that is the fifth sliding portion, and the auxiliary shaft portion 6c of the crankshaft 6, By forming a manganese phosphate film on the surface of the shaft 6, direct contact between metals can be avoided, high temperature conditions are difficult, and the metal surface is also difficult to activate, thereby suppressing the decomposition and polymerization of the refrigerant. can do. A manganese phosphate coating may be formed on the inner periphery of the main bearing 4 and the sub-bearing 5.

  By comprising as mentioned above, in all the sliding parts in the rotary compressor 200, the direct contact of metals is prevented and the iron-type material used as a component of the compression element 101 is in composition. It is possible to prevent a refrigerant having a carbon double bond from acting as a catalyst for polymerization or decomposition of the refrigerant, so that it is difficult to generate sludge, suppresses the failure of the rotary compressor 200 and clogging in the refrigeration circuit, Reliability can be obtained.

  As the coating applied to the vane 3, in addition to the DLC-Si coating, DLC (diamond-like carbon), CrN (chromium nitride), TiN (titanium nitride), TiCN (titanium carbonitride), TiAlN (titanium nitride aluminum), WC / C, VC, or the like may be used, and since the metal is not exposed on the sliding surface of the vane, these coatings have the same effect.

In addition to the method of covering the metal surface with a non-metallic coating as described above, there is a method of using the vane 3 itself as a ceramic material. Materials include SiC (silicon carbide), ZrO ₂ (zirconium dioxide), Al ₂ O ₃ (aluminum oxide), Si ₃ N ₄ (silicon nitride), etc., and by using these, the sliding surface of the vane 3 Since the metal is not exposed, the same effect can be obtained.

  Although the method of not exposing the metal surface on the surface of the vane 3 has been shown, the same method may be performed on the outer periphery 2a of the rolling piston 2. By coating the surface including the outer periphery 2a of the rolling piston 2 with DLC-Si, DLC, CrN, TiN, TiCN, TiAlN, WC / C, VC, etc., metal is applied to the sliding surface of the outer periphery 2a of the rolling piston 2. Since it is not exposed, it has the same effect.

In addition, the rolling piston 2 includes not only a method of covering the metal surface with a non-metallic coating, but also a method of using the material of the rolling piston 2 itself as a ceramic material. As the material, SiC, ZrO ₂ , Al ₂ O ₃ , Si ₃ N ₄ or the like can be applied, and the same effect is obtained because the metal is not exposed on the sliding surface of the outer periphery 2 a of the rolling piston 2.

  The other example in the vane groove | channel 1a of the cylinder 1 which is a 2nd sliding part, and the side part 3b of the vane 3 is shown. By coating the vane 3 with DLC, CrN, TiN, TiCN, TiAlN, WC / C, VC, etc., the metal is exposed on the sliding surface of the vane 3 even in the second sliding portion. Since it can prevent, the same effect can be acquired.

Moreover, since the material of the vane 3 is a ceramic such as SiC, ZrO ₂ , Al ₂ O ₃ , Si ₃ N ₄ or the like, the metal is not exposed on the sliding surface of the vane 3 even in the second sliding portion. The same effect can be obtained.

  The other Example in the inner periphery 2b of the rolling piston 2 which is a 3rd sliding part, and the eccentric shaft part 6a of the crankshaft 6 is shown.

  Although a method of forming a manganese phosphate film on the surface of the crankshaft 6 has been shown, measures may be taken on the rolling piston 2 side, and there is also a method of using a bearing material (not shown) on the inner diameter portion of the rolling piston 2. .

  There are two types of bearing materials, metal-based and resin-based (non-metallic), but those that meet the gist of the present embodiment are resin-based bearing materials (an example of non-metal).

  Specifically, it is desirable to use a bearing material mainly composed of PTFE (polytetrafluoroethylene) and POM (polyacetal) as the resin-based bearing material. Thereby, since the metal is not exposed to the sliding portion on the inner diameter side of the rolling piston, the same effect can be obtained.

  A bearing material (an example of a nonmetal) may be used for the eccentric shaft portion 6a of the crankshaft 6.

  Others in the inner periphery of the main bearing 4 that is the fourth sliding portion, the main shaft portion 6b of the crankshaft 6, the inner periphery of the auxiliary bearing 5 that is the fifth sliding portion, and the auxiliary shaft portion 6c of the crankshaft 6 Examples of

  Although the method of forming the manganese phosphate film on the surface of the crankshaft 6 has been shown, measures may be taken on the main bearing 4 and the sub-bearing 5 side, and there is also a method of using a bearing material for the inner diameter portion of the main bearing.

  There are two types of bearing materials, metallic and resin-based, but those that meet the gist of the present embodiment are resin-based bearing materials (an example of a non-metal).

  Specifically, it is desirable to use a bearing material mainly composed of PTFE and POM as the resin-based bearing material. Thereby, since the metal is not exposed to the sliding portion on the inner diameter side of the main bearing 4, the same effect can be obtained.

  A bearing material can also be used for the main shaft portion 6b and the sub shaft portion 6c of the crankshaft 6.

  In the above description, an example has been described in which at least one of the components constituting the sliding portion is made of a non-metal at least the sliding surface, but at least both of the components constituting the sliding portion are slid. The surface to be made may be made of a non-metal.

FIG. 3 shows the first embodiment, and is a refrigerant circuit diagram of the air conditioner. FIG. 3 is a diagram illustrating the first embodiment, and is a longitudinal sectional view of a rotary compressor 200. FIG. 3 shows the first embodiment and is a cross-sectional view taken along the line AA of FIG.

Explanation of symbols

  1 cylinder, 1a vane groove, 1b cylinder chamber, 1c back pressure chamber, 2 rolling piston, 2a outer periphery, 2b inner periphery, 3 vane, 3a tip, 3b side surface portion, 4 main bearing, 5 sub bearing, 6 crankshaft, 6a Eccentric shaft part, 6b Main shaft part, 6c Subshaft part, 7 Discharge muffler, 8 Vane spring, 12 Stator, 12a Stator core, 12b Winding, 12c Insulating member, 13 Rotor, 13a Rotor core, 13b Top plate 13c Lower end plate, 20 Airtight container, 21 Suction muffler, 22 Suction pipe, 23 Lead wire, 24 Terminal, 25 Discharge pipe, 30 Refrigerating machine oil, 41 Outdoor unit, 42 Indoor unit, 43 Compressor, 44 Four-way valve, 45 Outdoor Heat exchanger, 45a outdoor fan, 46 electronic expansion valve, 47 liquid pipe, 48 indoor heat exchanger, 48a indoor fan, 49 gas pipe, 10 DESCRIPTION OF SYMBOLS 1 Compression element, 102 Electric element, 200 Rotary compressor.

Claims (3)

An outdoor unit having a compressor, a four-way valve, an outdoor heat exchanger, a pressure reducing mechanism, and the like, and an indoor unit having an indoor heat exchanger, etc. are connected, and the outdoor unit and the refrigerant pipe of the indoor unit are connected during the refrigeration. In the refrigeration cycle apparatus forming the cycle,
As a refrigerant for the refrigeration cycle,
(1) A refrigerant mixture of HFO (hydrofluoroolefin) -1234yf and R32 having a carbon double bond that is decomposed by catalytic action of moisture in the composition;
(2) A mixed refrigerant of HFO-1234yf and R41 having a carbon double bond that is decomposed by the catalytic action of moisture in the composition;
Using one of the two types of mixed refrigerant,
The refrigeration cycle apparatus includes a first refrigerating machine oil having a saturated water content of less than 200 ppm and a high extreme pressure effect, a saturated water content of 2000 ppm or more, a high saturated water content, and a catalyst for water molecules to the refrigerant by intermolecular force. Enclose a refrigerating machine oil consisting of a second refrigerating machine oil that suppresses the action,
The first refrigerating machine oil is alkylbenzene, and the second refrigerating machine oil is polyvinyl ether or polyalkylene glycol having no hydrolyzing molecular structure;
The refrigerating cycle apparatus characterized by making the enclosure amount of said 1st refrigerating machine oil larger than the enclosure amount of said 2nd refrigerating machine oil. The refrigerating machine oil, the second refrigerating machine oil, claim 1 Symbol placement of the refrigeration cycle apparatus is characterized in that is mixed with 20 weight%. The compressor has a positive displacement compression mechanism, and at least one of the components constituting the sliding portion of the compression mechanism is configured with at least a sliding surface made of a non-metal,
DLC-Si (diamond-like carbon-silicon), CrN (chromium nitride), TiN (titanium nitride), TiCN (charcoal) are formed on the surfaces of the components constituting the sliding portion including at least the sliding surface. 3. The refrigeration according to claim 1 or 2 , wherein the refrigeration is performed by applying any one of titanium nitride), TiAlN (titanium nitride aluminum), WC / C (tungsten carbide coating), and VC (vanadium carbide). Cycle equipment.

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