CZ2014195A3 - Refrigerant compressor - Google Patents

Abstract

A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element configured to compress the refrigerant and comprising a slidable member that is a sliding portion and a cooling oil adapted to be fed to a sliding member for lubrication of the slidable portion, wherein at least one of the sliding surfaces of the slidable member is formed of a non-metallic material, and wherein the polymerization inhibitor adapted to suppress the refrigerant polymerization is contained in the cooling oil.

Description

Refrigeration compressor

References to related applications [0001]

This application claims priority from Japanese Patent Application No. 2013-086 267, filed April 17, 2013, the entire contents of which are incorporated herein by reference.

Technical Field

Aspects of the present invention relate to a refrigeration compressor for use in a refrigeration or air conditioning system, and more particularly to a refrigeration compressor utilizing ethylene fluorocarbon or a mixture utilizing ethylene fluorocarbon as the refrigerant.

Possession W & in technology [0003]

In the field of vehicle air conditioners, the refrigerant HFO-1234yf (CF3CF = CH2), which is a propylene fluorocarbon, is known as a low GWP (global heating potential) refrigerant.

[0004]

In general, in the case of propylene fluorocarbon which has a double bond in its composition, cleavage, decomposition or polymerization may occur due to the presence of this double bond.

Thus, for example, JP-A-2009-299 649 discloses a method of suppressing fission or polymerization in a refrigerant by forming a surface of a sliding sliding part of a compressor where the temperature of this part tends to be high, so that fission or polymerization of propylene fluorocarbon can easily occur by a non-metallic component.

[0005]

Tetrafluoroethylene is also useful as a monomer for producing a fluorine resin and a fluorine-containing elastomer having excellent heat resistance, chemical resistance and the like. However, since these materials are very easy to polymerize, in order to suppress polymerization, it is necessary to add a polymerization inhibitor to tetrafluoroethylene in its production.

JP-A-H11-246 447 describes such a technology.

Summary of the Invention

HFO-1234yf, a propylene fluorocarbon, has a high standard boiling point of -29 ° C and lower operating pressure and lower cooling capacity per intake volume than R410A (standard boiling point -51 ° C) or similar used in a stationary air conditioner. equipment.

For a stationary air conditioner, the volume flow rate of the refrigerant must be increased in order to achieve a refrigeration capacity equivalent to that of R410A by using HFO-1234yf refrigerant.

In this case, problems arose due to the increase in the contents of the compressor cylinders, as well as problems due to the increased pressure losses of the coolant and the deterioration of the efficiency due to the increased volume flow rate.

[0007]

Therefore, if a low GWP refrigerant is used in a stationary air conditioner, then a low GWP refrigerant with a low standard boiling point is suitable.

In general, there is a tendency that the smaller the carbon number of the refrigerant, the lower its low boiling point.

Therefore, when compared with the use of propylene fluorocarbon having a carbon number of 3, as in the prior art, and using ethylene fluorocarbon having a carbon number of 2, a low-boiling compound, i.e., a low-boiling refrigerant, can be obtained.

[0008]

However, compared to propylene fluorocarbon, since ethylene fluorocarbon has high reactivity, is thermally and chemically unstable and easily cleaves, dissolves or polymerizes, it is difficult to suppress cleavage or polymerization by using only the procedure described in JP-A-Y. 2009-299 649.

[0009]

Also, when using ethylene fluorocarbon as a refrigerant, cleavage or polymerization occurs easily, directly from the time the refrigerant is manufactured, and even during storage, cleavage or polymerization occurs.

To suppress the cleavage or polymerization of the refrigerant during storage or later, a polymerization inhibitor is added to the refrigerant, which is ethylene fluorocarbon, as described, for example, in JP-A-H11-246 447, to suppress polymerization at the time of refrigerant production or later.

Therefore, since the polymerization inhibitor is contained in the refrigerant, it was assumed that it was not necessary to add the polymerization inhibitor to the cooling oil.

However, even if the polymerization inhibitor has been added to the refrigerant, since the refrigerant circulates in the refrigeration circuit and there is a repeated phase change between liquid and gas, the sliding part of the compressor or the wound part of the engine is high where the temperature is high, so that polymerization is easy. the refrigerant evaporates.

Since the polymerization inhibitor is contained in the evaporated refrigerant and is entrained with it, it may not be sufficiently supplied to the sliding part of the compressor or the wound part of the engine, so that it is difficult to obtain a sufficient effect in suppressing the polymerization of the refrigerant.

[0010]

In particular, when each sliding part is made of metal, due to the mutual sliding operation, the sliding surface is heated to a high temperature, as a result of which the metal of the sliding surface is activated.

Since the activated metal acts as a reaction catalyst to promote the cleavage or dissolution of ethylene fluorocarbon, if the polymerization inhibitor is insufficient, the formation of the polymer that is formed when the solvent is polymerized is promoted.

[0011]

The object of the present invention is to solve the above-mentioned problems, in particular in a refrigeration compressor using ethylene fluorocarbon or a mixture containing ethylene fluorocarbon, to suppress fission or dissolution of the refrigerant on the sliding part of the compression element and to suppress polymerization of the refrigerant solvent.

[0012]

According to one aspect of the present invention, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the coolant and comprising a sliding member that is a sliding portion; cooling oil adapted to be supplied to the sliding member for lubricating the sliding portion, wherein at least one of the sliding surfaces of the sliding member is formed of a non-metallic material, and wherein a polymerization inhibitor adapted to suppress the polymerization of the coolant is contained in the cooling oil.

[0013]

According to another aspect of the present invention, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the coolant and comprising a sliding member. the sliding member is a sintered member comprising a polymerization inhibitor adapted to suppress the polymerization of the coolant, and wherein at least one of the sliding surfaces of the sliding member is formed of a non-metallic material.

According to yet another aspect of the present invention, there is provided a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture comprising ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the refrigerant and comprising a sliding member. and an electrical element arranged to drive the compression element and comprising a winding, wherein the polymerization inhibitor adapted to suppress the polymerization of the coolant is contained in the gap between the windings, and wherein at least one of the sliding surfaces of the sliding member is formed of a non-metallic material.

[0014]

Therefore, the increase in the temperature of the sliding portion of the compression member can be suppressed, the metal activation of the sliding surface can be suppressed, the cleavage or dissolution of the refrigerant by the activated metal can be suppressed, and the polymerization of the refrigerant solvent can be suppressed by the cooling oil polymerization inhibitor.

BRIEF DESCRIPTION OF THE DRAWINGS [0015]

The invention will be explained in more detail below with reference to examples of its embodiment, the description of which will be given with reference to the accompanying drawings, in which:

Fig. 1 is a longitudinal sectional view of a refrigeration compressor according to Embodiment 1 of the present invention;

Fig. 2 is a sectional view of a refrigeration compressor according to Embodiment 1 of the present invention taken along line A-A of Fig. 1;

Fig. 3 shows a perspective view of a component of a compression element according to Embodiment 6 of the present invention; and Fig. 4 shows a perspective view of a main bearing 6 (a part of the main bearing 4 is omitted) according to Embodiment 7 of the present invention.

Examples of embodiments of the invention

Embodiment 1 [0016]

Embodiments of the present invention will now be further described with reference to a rotary compressor, as an example of a refrigeration compressor.

Although a single-cylinder rotary compressor will be further described as an exemplary embodiment, the invention may also be implemented using a multi-cylinder rotary compressor.

[0017]

Giant. 1 and 2 show an embodiment 1.

Giant. 1 shows a longitudinal sectional view of a rotary compressor 200.

Giant. 2 is a sectional view taken along line A-A of FIG. 1.

[0018]

The entire construction of the rotary compressor 200 will now be briefly described.

[0019]

The example of the rotary compressor 200 shown in Fig. 1 is a vertical type of compressor that includes a sealed vessel 20 having a high internal pressure.

The compression element 101 is housed in the lower part of the interior of the sealed container 20.

An electrical element 102 for driving the compression element 101 is mounted above the compression element 101 in the upper part of the interior of the sealed container 20.

[0020]

Cooling oil 30 for lubricating the respective sliding sliding parts of the compression element 101 is housed in the lower part of the inside of the sealed container 20.

[0021]

First, the construction of the compression element 101 will be described.

The cylinder 11 comprising the compression chamber comprises an outer circumference having a substantially circular shape when viewed from above, and also includes a chamber 1b of the cylinder 1, which represents a space having a substantially circular shape when viewed from above.

The chamber 1b of the cylinder 1 is open at both its ends in the axial direction.

The cylinder 1 has a predetermined height in the axial direction when viewed from the side.

[0022]

The cylinder 1 comprises parallel vane grooves 1a, formed so as to penetrate the cylinder in the axial direction.

Each vane groove 1a is connected to a cylinder chamber 1b formed of a substantially circular space in the cylinder 1, extending in the radial direction of the cylinder 1.

[0023]

On the rear side (outer side) of the vane groove 1a, a back pressure chamber 1c is formed, which is a space connected to the vane groove 1a and having a substantially circular shape when viewed from above.

[0024]

The cylinder 7 has an inlet or suction opening (not shown), through which the intake gas from an externally arranged cooling circuit passes.

The inlet suction opening penetrates through the chamber 1b of the cylinder jL from the outer peripheral surface of the cylinder f.

[0025]

The cylinder 1 comprises a discharge opening (not shown) formed by cutting off a part adjacent to the circle forming the cylinder chamber 1b (end surface on the side of the electrical element 102), which is a substantially circular space.

[0026]

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

[0027]

The rolling piston 2 rotates eccentrically in the cylinder chamber 1b.

The rolling piston 2 has an annular shape, the inner circumference of the rolling piston 2 abutting on the eccentric shaft part 6a of the crankshaft 6.

[0028]

Rolling piston and cylinder

1 perform an eccentric movement so that the outer circumference of the rolling piston 2 almost follows the inner wall of the chamber 1b of the cylinder 1.

[0029]

The rolling piston 2 is made, for example, of alloy steel containing chromium or the like.

[0030]

Shovel 2 Yippee stored in the paddle groove la war 1, where is in always pressed on rolling piston 2 through vane springs 3 arranged in chamber 1c back pressure.

In the case of the rotary compressor 200, since the sealed vessel 20 has a high internal pressure, when the rotary compressor 200 starts operating, the force caused by

due pressure difference between high internal pressure in sealed container 20 and pressure in chamber lb cylinder jl, acts on the back area (on side chambers 1c retrospective pressure) blades 3.

Thus, the vane spring 8 is mainly used to press the vane 3 against the rolling piston 2 when starting the operation of the rotary compressor 200 (when there is no pressure difference between the inside of the sealed vessel 20 and the chamber 1b of the cylinder 1).

[0031]

The shape of the blade 3 is formed by a flat and substantially rectangular parallelepiped (the thickness in the circumferential direction is less than the lengths in the radial and axial direction).

[0032]

The blade 3 is in particular made of high-speed tool steel.

[0033]

The main bearing 4 slidably abuts the main shaft portion 6b (the portion above the eccentric shaft portion 6a) of the crankshaft 6 and closes one end face (on the electric element side 102) of the cylinder chamber 1b (including the vane groove 1a) of the cylinder 1L.

[0034]

The main bearing _4 contains a discharge valve (not shown).

However, the discharge valve can also be arranged in the main bearing 4, the secondary bearing 5 or in both of these bearings.

[0035]

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

[0036]

The secondary bearing 5 slidably abuts the secondary shaft portion 6c (a portion which is located downward from the eccentric shaft portion 6a) of the crankshaft 6 and closes the second end surface (arranged on the cooling oil side 30) of the cylinder chamber 1b (including the vane groove 1a). cylinder _1.

[0037]

The secondary bearing 5 is substantially T-shaped when viewed from the side.

[0038]

The main bearing 1 and the secondary bearing 5 are, similarly to the cylinder 1, respectively made of gray cast iron, sintered or carbon steel or the like.

[0039]

The discharge damper 7 is mounted on the outside (on the side of the electrical element 102) of the main bearing 4.

The high temperature and high pressure extruded gas, which is expelled from the discharge valve of the main bearing 4, enters the discharge damper 7 and is then blown from the discharge damper 7 into the sealed container 20.

However, the discharge damper can also be arranged on the side of the secondary bearing 5.

[0040]

Arranged on the side of the sealed container 20 is a suction damper 21 which sucks low pressure refrigerant gas from the refrigeration circuit and prevents the liquid refrigerant from being sucked directly into the cylinder chamber 11 when the liquid refrigerant returns.

The suction damper 21 is connected via a suction pipe 22 to the suction opening of the cylinder 1.

The main body of the suction damper 21 is fixed to the side surface of the sealed container 20 by welding or the like.

[0041]

Next, the construction of the electric element 102 will be described.

A brushless or brushless DC motor is used as the electrical element 102.

However, the induction motor can also be used as an electrical element 102.

[0042]

The electrical element 102 comprises a stator 12 and a rotor 13.

The stator 12 is connected and fixed to the inner circumferential surface of the sealed container 20, the rotor 13 being located inside the stator 12 with a clearance between them.

[0043]

The stator 12 comprises a stator iron core 12a which is formed by cutting an electromagnetic steel plate having a thickness of 0.1 to 1.5 mm into a predetermined shape, layering a predetermined number of cut parts in the axial direction and attaching them to each other by sealing, for example by welding or the like.

The stator 12 further includes a three-phase winding 12b wound on a plurality of tooth portions (not shown) of the stator iron core 12a by a concentrated winding method.

The three-phase winding 12b is wound on the tooth portion by the insulating member 12c.

The winding 12b is formed of copper wires coated with Al (amide imide) / E1 (ester imide) or the like.

In particular, they are used for the insulating member 12c

PET (polyethylene terephthalate),

PBT (polybutylene terephthalate),

FEP (tetrafluoroethylene hexafluoropropylene copolymer (4.6 fluorinated)),

PFA (tetrafluoroethylene perfluoroalkyl vinyl ether copolymer),

PTFE (polytetrafluoroethylene),

LCP (liquid crystal polymer),

PPS (polyphenyl sulfide), phenolic resin, and the like.

[0044]

The winding 12b partially protrudes from the two ends in the axial direction (in Fig. 1 it is the axial direction of the upper and lower ends) of the stator iron core 12a.

The protruding parts are called coil ends.

In Fig. 1, the part indicated by reference numeral 12b represents one coil end of the winding 12 (on the side opposite to the compression element 101).

The guide wire 23 is connected to a terminal (not shown) which is mounted on the insulating member 12c.

[0045]

Slots (not shown) are formed on the outer periphery of the stator iron core 12a in a variety of positions, at substantially regular intervals.

These cutouts represent one of the passages for the expelled gas which is extruded from the discharge damper 1 into the sealed vessel 20, while also serving as a passage through which the cooling oil 30 returns from the top of the electrical element 102 to the bottom of the sealed vessel 20.

[0046]

The rotor 13, arranged inside the stator 12, with a clearance (usually about 0.3 to 1 mm) between them, comprises a rotor iron core 13a, which, similarly to the stator iron core 12a, is formed by cutting an electromagnetic steel plate having a thickness of 0.1 up to 1.5 mm, to a predetermined shape, by layering a given number of cut-out parts in the axial direction, and fixing them together by sealing, welding or the like.

The rotor 13 further comprises a permanent magnet (not shown) which is intended to be accommodated in a storage opening of a permanent magnet (not shown) formed in the rotor iron core 13a.

A magnet made of, for example, ferrite or rare earths is used here as a permanent magnet.

[0047]

In order to prevent the permanent magnet, accommodated in the permanent magnet housing opening, from falling out in the axial direction, end plates are arranged at both ends in the axial direction of the rotor 13 (in Fig. 1 at the upper and lower ends in the axial direction).

The rotor 13 comprises an upper end plate 13b, on the upper end portion in the axial direction and a lower end plate 13c on the lower end portion in the axial direction.

[0048]

The upper and lower end plates 13b and 13c serve as rotary balancing devices.

In addition, the upper and lower end plates 13b and 13c are integrally fixed by using a plurality of fixing rivets or the like (not shown).

[0049]

Rotor iron core (not shown) that eats

13a has a plurality of through holes extending substantially in the axial direction and serving as gas channels for the extruded gas.

[0050]

The terminal 24, which is intended to be connected to a power supply serving as an electrical power supply, is attached to the sealed container 20 by welding.

In the exemplary embodiment of FIG. 1, the tip 24 is disposed on the upper surface of the sealed container 20.

A guide wire from the electrical element 102 is connected to the terminal 24.

[0051]

A discharge tube 25 having two open ends is mounted on the upper surface of the sealed container 20.

The expelled gas extruded from the compression element 101 is thus expelled from the sealed vessel 20 through the discharge pipe 25 into the external cooling circuit.

[0052]

If the electric element 102 is formed as an induction motor, the rotor 13 has a rotor iron core 13a formed by cutting an electromagnetic steel plate having a thickness of 0.1 to 1.5 mm into a specific shape by stacking a given number of cut parts in the axial direction. and attaching them to each other by sealing by welding or the like.

The rotor 13 further has a cage winding formed by filling or inserting an aluminum or copper conductor into a groove formed in the rotor iron core 13a, the two ends of the conductor being short-circuited by an end ring.

[0053]

As the cooling oil 30 to be collected in the lower part of the inside of the sealed container, for example, POE (polyol ester), which is a synthetic oil, PVE (polyvinyl ether) and AB (alkylbenzene), is used.

The viscosity of the oil was selected to be sufficient to lubricate the rotary compressor 200, including mixing the coolant with the oil, which also prevents the efficiency of the rotary compressor 200 from decreasing.

In general, the kinematic viscosity at (43 ° C) of the base oil is about 5 to 300 [cSt].

[0054]

The cooling oil contains from 0.1% to 5% limonene as a cooling polymerization inhibitor.

[0055]

The compressor uses trans-1,2, difluoroethylene (R1132 (E)) as a refrigerant, which is a low-boiling refrigerant, similar to R410A.

[0056]

The general function and operation of the rotary compressor 200 will now be described.

When energy is supplied from the terminal 24 and the guide wire 23 to the stator 12 of the electrical element 102, the rotor 13 rotates.

As a result, the crankshaft 6 attached to the rotor 13 rotates, and the rolling piston 2 rotates eccentrically in the cylindrical chamber 1b of the cylinder 1.

The space between the cylindrical chamber 1b of the cylinder 7 and the rolling piston 2 is divided into two parts by means of a vane 3.

As the crankshaft 6 rotates, the volumes of both spaces change.

In particular, refrigerant is sucked into one space from the suction damper 21 due to its gradually increasing volume, while in the other space, the cooling gas is compressed due to its gradually decreasing volume.

The compressed discharge gas is forced from the discharge damper 2 into the sealed container 20, then passes through the electrical element 102 and is further forced from the discharge tube 25 attached to the sealed container 20 to the outside of the sealed container 20.

[0057]

The expelled gas flowing in front of the electric element 102 passes through the through hole of the rotor 13 of the electric element 102, through an air gap containing a groove hole (not shown) of the stator iron core 12a, cutouts formed on the outer periphery of the stator iron core 12a, and the like.

[0058]

When the rotary compressor 200 performs the above function, as will be described below, there is a plurality of sliding parts where the components slide relative to each other:

(1) The first sliding part: The outer circumference 2a of the rolling piston 2 and the front end 3a (inside) of the blade 3;

(2) The second sliding sliding part: The blade groove 1a of the cylinder 6 and the side surface portion 3b of the blade 3 (both side surfaces);

(3) Third sliding part: The inner circumference 2b of the rolling piston 2 and the eccentric shaft part 6a of the crankshaft 6;

(4) Fourth sliding portion: The inner circumference of the main bearing 4 and the main shaft portion 6b of the crankshaft 6; and (5) Fifth sliding portion: The inner circumference of the sub-bearing 5 and the sub-shaft portion 6c of the crankshaft 6.

[0064]

The components which are arranged in the compression element 101 and constitute the sliding parts are as follows:

(1) Cylinder 1;

(2) Rolling piston 2;

(3) Shovel 3;

(4) Main bearing £;

(5) Secondary bearing 5;

(6) Crankshaft 6.

[0071]

Furthermore, although not shown, a rotary compressor of the swing type is also known, in which when the drive shaft is driven, at the same time when the protruding front end portion of the vane 3 formed integrally on the rolling piston 2 moves in and out relative to the support body along the bearing grooves of the support body, so that the support body rotates.

That is, in the rotary compressor of the oscillating type, the vane 3 is extended and retracted in the radial direction, performing an oscillating movement due to the rotation of the rolling piston 2, thereby always dividing the interior of the cylindrical chamber 1b into a compression chamber and a suction chamber.

[0072]

In such a rotary compressor of the swing type, the protruding front end portion of the vane 3 and the bearing groove in the support body constitute a sliding portion.

[0073]

A cylindrical holding hole is also formed between the suction and discharge openings in the cylinder 7.

The support body formed of two semicircular members, each of which has a semicircular cross section, is rotatably connected to a cylindrical holding hole.

Therefore, the outer peripheral surface of the support body and the tubular holding hole in the cylinder constitute another sliding portion.

[0074]

In this embodiment, since trans-1,2, difluoroethylene (R1132 (E)) is used as the refrigerant, the refrigerant is thermally and chemically unstable, so that cleavage or polymerization can easily occur due to a chemical reaction.

If the refrigerant is polymerized to form a polymer, there is a possibility that the interior of the compressor or refrigeration circuit may be clogged or clogged with the polymer.

Particularly in the part where the temperature is high, the chemical reaction of the refrigerant will be promoted, so that polymerization can easily occur.

Therefore, in order to suppress the polymerization of the refrigerant, it is necessary to take measures, for example, to attach the polymerization inhibitor to the high temperature part.

[0075]

The above-mentioned sliding parts of the compression element and the wound parts of the electric element represent parts where the temperature in the compressor is high.

The sliding part of the compression element generates heat when the components of the compression element slide relative to each other, and the wound part of the electric element generates heat when current is supplied to the winding for rotating the rotor 13.

[0076]

Since ethylene fluorocarbon has a high reactivity, even during storage at room temperature, cleavage or polymerization occurs.

Therefore, when using ethylene fluorocarbon as a refrigerant, a polymerization inhibitor to suppress the polymerization of the refrigerant is added to the refrigerant during production.

Even during storage, the polymerization inhibitor is always mixed into ethylene fluorocarbon.

In the state where the ethylene fluorocarbon and the polymerization inhibitor are separated from each other, the refrigerant is not used or stored.

However, in the compressor, since the fission of the refrigerant is promoted due to the relative sliding movements of the metal parts, there is a high possibility that the solvent will be polymerized.

Thus, even if the polymerization inhibitor is already added to the refrigerant, the sliding parts of the compression element and the wound parts of the electrical element which have a high temperature evaporate the refrigerant, and the polymerization inhibitor goes away with the evaporated refrigerant and is not left in the high temperature parts. temperature.

Therefore, the effect of the polymerization inhibitor cannot be sufficiently preserved.

[0077]

On the other hand, the cooling oil 30 collected in the sealed container 20 is supplied to the respective sliding parts of the compressor through an oil lubrication mechanism (not shown) arranged in the compression element to lubricate the sliding parts.

In general, the refrigerant and refrigerant oil are stored and transported separately, and when the air conditioner is assembled, the refrigerant and refrigerant oil are filled into the compressor and the refrigeration circuit.

Therefore, even if a polymerization inhibitor that suppresses the polymerization of a refrigerant such as limonene is added to the cooling oil, since the refrigerant oil and the refrigerant do not mix with each other, the polymerization inhibitor will not act on the refrigerant oil during storage to suppress the polymerization of the refrigerant.

Therefore, it is not necessary to add the polymerization inhibitor to the cooling oil.

In addition, even if the refrigerant oil is filled into the compressor and the refrigeration circuit, when the compressor is stopped, since the refrigerant can evaporate and thus move freely in the refrigeration circuit, the refrigerant oil collects at the bottom of the sealed container and cannot freely. to move.

Therefore, even if the polymerization inhibitor is added to the refrigerant oil, it will not mix with the refrigerant, so that the polymerization inhibitor will not act on the refrigerant to suppress its polymerization.

Therefore, when the compressor is stopped and when the polymerization inhibitor is already added to the refrigerant, it is not necessary to add the polymerization inhibitor to the refrigerant oil.

However, when the compressor is in operation, by adding a polymerization inhibitor to the cooling oil, the polymerization inhibitor can be fed to the sliding parts together with the cooling oil, and a sufficient amount of the polymerization inhibitor can be maintained on the sliding parts.

Thus, even if the sliding parts start to have a high temperature, the polymerization of the refrigerant may be suppressed.

Therefore, the polymerization inhibitor can serve its purpose.

Also, the high temperature refrigerant compressed by the compression element as described above passes through the electric element 102 and is extruded to the outside of the sealed container 20 from the discharge tube 25 arranged on the upper surface of the sealed container 20.

In this case, since the refrigerant flows rapidly, a portion of the limonene-containing refrigerant oil is supplied to the electrical element as it is dissolved in the refrigerant.

The refrigerant supplied to the electric element impinges on the electric element, after which the refrigerant and the cooling oil are separated from each other, the refrigerant flowing to the discharge pipe 25 arranged at the top, and the cooling oil returns to the bottom of the sealed container where the cooling oil gather e.

A portion of the separated cooling oil adheres to the winding of the electrical element when striking the electrical element and is temporarily maintained there.

Thus, even when the winding starts to have a high temperature, the polymerization of the refrigerant is suppressed, so that the polymerization inhibitor may have an effect.

[0078]

As already described above, in the case of the sliding parts of the compression element and the wound parts of the electrical element which start to have a high temperature in the compressor, a sufficient amount of polymerization inhibitor can be maintained by supplying a cooling oil containing limonene as a polymerization inhibitor.

[0079]

Also, the polymerization inhibitor contained in the refrigerant acts on the evaporated refrigerant, thereby effectively suppressing the polymerization of the refrigerant.

[0080]

Thus, for high temperature parts that are easy to polymerize, the polymerization can be suppressed by the limonene-containing cooling oil.

Therefore, even when using a refrigerant that is easy to polymerize, sufficient reliability can be maintained.

[0081]

In the sliding parts of the compression element, each of which is made of metal, their sliding surfaces begin to have a high temperature due to the mutual sliding movement of the metals, the metals of the sliding surfaces being activated.

The activated metal surfaces of the sliding parts act as reactive catalysts for a thermally and chemically unstable refrigerant and cause the refrigerant to split.

In addition, the exposed metal activated surface of the resulting solvent acts as a polymer catalyst to promote polymer formation.

The polymerization inhibitor suppresses not only the polymerization of the solvent but also the cleavage or dissolution of the refrigerant, and the action of the polymerization inhibitor can be further promoted.

This means that in the case of sliding parts of the compression element, the action of the catalyst can be suppressed by suppressing the exposure of the activated metal surfaces.

[0082]

As will be described below, at least one of the two components forming the sliding portion is formed of a non-metallic material.

Thus, in the case where one part of the sliding part is made of a non-metallic material having a low specific heat, the temperature increase can be reduced as compared with the mutual sliding movements of the two metals, thereby suppressing the activation of the metal surface of the sliding part.

As a result, the cleavage and polymerization of the refrigerant can be suppressed.

[0083]

First, on the outer circumference of the rolling sand 2 and the front end 3a of the blade 3, which constitute the first sliding part, the surface of the blade 3 is coated with a DLC-Si (diamond-silicone) carbon coating (as a non-metallic example).

Thus, in the case of mutual sliding movement between the outer circumference of the rolling piston 2 and the front end 3a of the blade 3, direct contact between the metals can be prevented.

Therefore, it is difficult for a high temperature to occur at the first sliding part, and activation is also difficult for the metal surface, as a result of which the polymerization of the refrigerant can be suppressed.

[0084]

The DLC-Si coating is a silicone-containing amorphous carbon having a surface layer thickness of from 2,000 to 2,500 Hmv and a film thickness of 3 μm or the like.

[0085]

Also in the case of the blade groove 1a of the cylinder 7 and the side surface part 3b of the blade 3, which constitute the second sliding part, direct contact between the metals can be prevented by coating the above-mentioned surface of the blade 3 with a DLC-Si coating, so that the metal surface is difficult to activate. so that it is possible to suppress and difficult to polymerize the binder.

[0086]

The inner circumference 2b of the rolling belt 2 and the eccentric shaft part 6a of the crankshaft 6, which constitute the third sliding part, by preventing direct contact between metals by forming a manganese phosphate film (non-metallic coating example) on the crankshaft surface 6, so that the metal surface it is difficult to activate and it is difficult to reach a high temperature, so that the polymerization of the refrigerant can be suppressed. Here, a manganese phosphate film can also be formed on the inner circumference 2b of the rolling piston 2.

[0087]

At the inner circumference of the main bearing 4 and the main shaft portion 6b of the crankshaft 6, which constitute the fourth sliding portion, and at the inner circumference of the secondary bearing 5 and the secondary shaft portion 6c of the crankshaft 6, which constitute the fifth sliding portion, by forming a manganese phosphate film on the direct surface between the metals can be prevented from the surface of the crankshaft 6, so that the metal surface can be difficult to activate and difficult to reach the high temperature, so that the polymerization of the refrigerant can be suppressed.

Here, a manganese phosphate film can also be formed on the inner circumferences of the main bearing 4 and the secondary bearing 5.

[0088]

Due to the above construction, in the respective sliding parts of the rotary compressor 200, since direct contact between metals can be prevented, its activation can be suppressed in the case of a metal surface serving as a sliding surface, and temperature rise in the sliding parts can be suppressed. , as a result of which the cleavage and polymerization of the refrigerant can be suppressed.

This can prevent the rotary compressor 200 from failing and clogging the refrigeration circuit, which could otherwise occur due to the resulting refrigerant polymers.

Therefore, the compressor can be reliable for a very long time.

[0089]

Here, the non-metallic construction does not have to be used for all the above-mentioned sliding parts. Since the metal surface is easily activated in a part where the surface pressure of the sliding part is high, the sliding speed is high and the lubrication state is insufficient, by forming such a part from a non-metallic material, cleavage or polymerization of the refrigerant can be suppressed and the conversion process such parts on a non-metallic structure can be saved.

In the part where the surface pressure of the sliding part is small, the speed of the sliding movement is low and the lubrication state is good, even if the sliding parts are appropriately made of metallic materials, it is difficult to activate the sliding surfaces.

Therefore, it is not always necessary to convert them to a non-metallic structure.

[0090]

Also, by preventing direct contact with metals, the promotion of refrigerant fission is suppressed, and in the case of the refrigerant solvent, polymerization is suppressed by the polymerization inhibitor contained in the cooling oil.

Therefore, the formation of polymers can be further suppressed, as a result of which the reliability of the compressor can be further increased.

[0091]

In the above description, an example of the use of trans-1,2, difluoroethylene (R1132 (E)) as a refrigerant was given.

However, the use of fluoroethylene (R1141), cis-1, difluoroethylene (R1132 (Z)), 1,1-difluoroethylene (R1132a),

1, 1, 2 trifluoroethylene (R1123) or the like can provide similar effects.

[0092]

As described above, limonene is used as a polymerization inhibitor contained in the cooling oil.

However, terpenic hydrocarbons such as pecan, camphene, cymene and terpene, or terpene alcohol such as citronellol, terpineol and borneol may also be used.

Embodiment 2 [0093]

An embodiment is a method in which, in the case of a part where the temperature can easily rise, a sufficient amount of a cooling oil containing a polymerization inhibitor is provided to suppress this polymerization.

However, the polymerization inhibitor may also be present on the sliding member in advance.

This method will now be described below.

[0094]

The cylinder 6, the main bearing 6 and the secondary bearing 5 shown in Embodiment 1 may also be arranged as porous sintered components.

The polymerization inhibitor or cooling oil containing the polymerization inhibitor is pre-impregnated in these sintered components, and the compressor is then assembled.

In this method, since the temperature in the compressor cylinder or in the sliding part is easily increased, the polymerization inhibitor escapes from the sintered parts, so that the polymerization of the refrigerant can be further suppressed.

[0095]

Therefore, even if the polymerization conditions of the refrigerant are satisfied in a state where the amount of the cooling oil filled in the sliding portion of the compression member is not sufficient, the polymerization of the refrigerant can be suppressed by the polymerization inhibitor maintained on the sintered parts.

Embodiment 3 [0096]

Other than the sliding part in the wound part of the electric part

element for which also occurs considerable increase temperatures, similar to embodiment 2, it can also in advance contain polymerization inhibitor. This way will be described below. [0097] At the wound part 12b electric element when each the winding has

circular cross section, a gap is created between one winding and another winding.

This gap between the windings, similarly to the porous property of the sintered component, is able to contain and retain the polymerization inhibitor or cooling oil contained in the polymerization inhibitor.

For example, the polymerization inhibitor is contained in a working oil for use in a winding process, or the winding is immersed in the polymerization inhibitor.

Since the polymerization inhibitor in the wound portion 12b is sufficiently supplied to the wound portion when the polymerization occurs, the preventive effect of the refrigerant polymerization can be promoted.

[0098]

Although the conditions for polymerizing the refrigerant are satisfied in a state where the amount of the cooling oil charged to the sliding portion of the wound portion of the electrical element is not sufficient, the polymerization of the refrigerant can be suppressed by the polymerization inhibitor contained in the wound portion.

Embodiment 4 [0099]

Embodiment 1 provided an example of how, in the case of five sliding parts, the activation of the metal surfaces can be suppressed and the temperature rise of the sliding parts can be suppressed while preventing direct contact between the metals.

However, several types of methods other than Embodiment 1 can be used as a method for achieving a similar effect.

Embodiment 4 represents another method, relating to the first sliding part, which is formed by the outer circumference 2a of the rolling piston 2 and the front end 3a of the blade 3.

[00100]

Although a method of coating blade 3 with a DLC-Si coating has been described in Embodiment 1, DLC (diamond carbon), CrN (chromium nitride), TiN (titanium nitride), TiCN (titanium carbonitride), TiAlN (nitride) can also be used as the blade coating 3. titanium and aluminum), WC / C (tungsten carbide coating), VC (vanadium carbide) or the like.

Since no metal is exposed on the sliding surface of the blade, these coatings also provide a similar effect as in Embodiment 1.

[00101]

Also in the case of the blade 3, in addition to the above-mentioned method for covering the surface of a metal with a non-metallic coating, a method is also known for forming the blade 3 itself from a ceramic material.

This material includes SiC (silicon carbide), ZrO ₂ (zirconia), Al ₂ O ₃ (alumina), Si ₃ N 4 (silicon nitride) and the like.

Since their use can prevent the metal from being exposed to the sliding sliding surface of the blade 3, a similar effect as in Embodiment 1 can be obtained.

[00102]

Although embodiment 1 is a method of suppressing the exposure of a metal surface on the surface of the blade 3, a similar method can also be used in the case of the outer circumference 2a of the rolling piston 2.

• · · · • · · · · • If surface flat, including the outer perimeter 2a rolling píStU 2y is coated with DLC-Si, DLC, CrN, TIN, TiCN, TÍA1N, WC / C, VC or similar, metal is not exposed to the slide sliding outer perimeter area 2a

rolling piston 2.

As a result, a similar effect as in Embodiment 1 can be obtained.

[00103]

In the case of the rolling piston 2, in addition to the method of coating the metal surface with a non-metallic coating, the method of forming the rolling piston 2 itself from a ceramic material can also be used.

This material may include Sic, ZrO ₂ , Al ₂ O ₃ , Si ₃ N ₄ and the like.

Since the metal is not exposed to the sliding surface of the outer circumference 2a of the rolling piston 2, a similar effect as in Embodiment 1 can be obtained.

Embodiment 5 [00104]

Similarly to Embodiment 4, Embodiment 5 is also an example of the second sliding portion formed by the vane groove 1a of the cylinder 7 and the side surface portion 3b of the vane 2.

As in Embodiment 4, the blade 3 may be coated with DLC, CrN, TIN, TiCN, T1A1N, WC / C, VC or the like.

Thus, in the case of the second sliding sliding portion, since the exposure of the sliding sliding surface of the blade 3 can be suppressed, a similar effect as in Embodiment 1 can be obtained.

When the blade 3 is also made of a ceramic material such as Sic, ZrO ₂ , Al ₂ O ₃ and Si ₃ N ₄ , since the metal is not exposed to the sliding surface of the blade at the second sliding part, a similar effect can be obtained as in embodiment 1.

Embodiment 6 [00105]

Embodiment 6 is a further embodiment relating to the third sliding part formed by the inner circumference 2b of the rolling piston 2 and the eccentric shaft part 6a of the crankshaft 6.

[00106]

Giant. 3 shows an embodiment 6, being a perspective view of a rolling piston 2.

[00107]

Although Embodiment 1 is a method of forming a manganese phosphate film on the surface of the crankshaft 6, different measures may also be taken in the case of the rolling piston side 2, as shown in Fig. 3, for example, and a method of using the bearing support member 9 may be applied to part of the inner diameter of the rolling piston 2.

[00108]

This support bearing member 9 comprises two types of members.

One is made of a metallic material, while the other is made of a resin (non-metallic material).

The support bearing member 1 formed of resin (as an example of non-metallic members) is a characteristic feature of this embodiment.

[00109]

A support bearing member 9 containing PTFE (polytetrafluoroethylene) or POM (polyacetal) as a main component can be advantageously used.

Since in this case, the metal is not exposed to the sliding part of the rolling piston inside its diameter side, a similar effect as in Embodiment 1 can be obtained.

[00110]

The support bearing member 9 (as an example of non-metallic members) can also be used here in the case of the eccentric shaft portion 6a of the crankshaft 6.

Embodiment 7 [00111]

Embodiment 7 is another example relating to a fourth sliding portion formed by the inner circumference of the main bearing 4 and the main shaft portion 6b of the crankshaft 6, and a fifth sliding portion formed by the inner circumference of the secondary bearing 5 and the secondary shaft portion 6c of the crankshaft _6.

[00112]

Giant. 4 is a perspective view of the main bearing 4 (partially omitted) showing a seventh embodiment.

[00113]

Although Embodiment 1 was a method of forming a manganese phosphate film on the surface of the crankshaft 6, different measures may also be taken on the side of the main and secondary bearings £ and J5, as shown in Fig. 4, for example, and the method of using of the support bearing member 10 (as an example of non-metallic members) on a part of the inner diameter of the main bearing £.

[00114]

This support bearing member 10 includes two types of members.

One is made of a metallic material, while the other is made of a resin.

The support bearing member 10 formed of resin is a characteristic feature of this embodiment.

[00115]

The support bearing member 10 containing PTFE (polytetrafluoroethylene) or POM (polyacetal) as a main component can be advantageously used.

In this case, since the metal is not exposed to the sliding part of the rolling piston inside its diameter side, a similar effect as in Embodiment 4 can be obtained.

[00116]

The support bearing member 10 can also be used here in the case of the main and secondary shaft portions 6b and 6c of the crankshaft 6.

[00117]

Although an example in which at least the sliding surface of one of the sliding part forming parts is formed of a non-metallic material has been described, at least the sliding surfaces of the two sliding part forming parts may be formed of a non-metallic material.

Embodiment 8 [00118]

The cooling oil used in the above embodiments generally includes an anti-wear agent.

Since this anti-wear agent has a function of preventing wear of the sliding particles due to its dissolution, it is known that the solvent of the anti-wear agent reacts with the solvent of the easily soluble ethylene fluorocarbon or a mixture thereof to form solids.

There is a concern that solids may accumulate in fine flow channels, such as the expansion valve and capillary tube, in the refrigeration cycle, which can cause clogging and thus poor cooling.

In this embodiment, since the cooling oil is properly selected so as not to contain an anti-wear agent, a refrigeration compressor can be formed which does not produce solids formed by the reaction between the anti-wear agent solvent and the ethylene fluorocarbon solvent or mixture thereof. to clog the refrigeration circuit so that the compressor is able to maintain excellent performance for a long period of time.

[00119]

The present invention has the following illustrative and non-limiting aspects:

(1) According to a first aspect, a refrigeration compressor arranged to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant has been developed, the refrigeration compressor comprising: a compression element arranged to compress the coolant and comprising a sliding sliding member a lubricating part, and a cooling oil adapted to supply the sliding part with lubrication of the sliding part, at least the sliding parts of the sliding surfaces being slidably made of non-metallic material, and wherein the inhibitor is slidably adapted to suppress polymerization, coolant polymerization. contained in cooling oil.

(2) According to a second aspect, a refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant has been developed, the refrigeration compressor comprising: a compression element arranged to compress the refrigerant and comprising a sliding sliding member the sliding part is a sliding sintered sintered part comprising a polymerization inhibitor adapted to suppress the polymerization of the coolant, and wherein the at least one sliding sliding part is formed of sliding surfaces of a non-metallic material.

(3) According to a third aspect, there is provided a refrigeration compressor, compressing ethylene fluorocarbon or a mixture, adapted to contain ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the coolant and comprising a sliding sliding member a sliding part, and an electrical element arranged to drive the compression element and comprising a winding, wherein a polymerization inhibitor adapted to suppress the polymerization of the coolant is contained in the gap between the windings, and wherein at least one of the sliding sliding surfaces is formed of a non-metallic material.

(4) According to a fourth aspect, a refrigeration compressor according to any first to third aspects has been developed, wherein the ethylene fluorocarbon comprises at least one substance selected from the group consisting of fluoroethylene (R1141), trans-1,2-difluoroethylene (R1132 (E)) , cis-1,2-difluoroethylene (R1132 (Z)), 1, difluoroethylene (R1132a), and 1, 1, 2 trifluoroethylene (R1123).

(5) According to a fifth aspect, a refrigeration compressor according to any one of the first to fourth aspects has been developed, wherein the polymerization inhibitor is a terpine compound.

(6) According to a sixth aspect, a refrigeration compressor according to the fifth aspect has been developed, wherein the terpine compound is selected from the group consisting of limonene, pinene, camphene, cymene, terpinene, citronellol, terpineol and bornelol.

(7) According to the seventh aspect, a refrigeration compressor according to any one of the first to sixth aspects has been developed, wherein the non-metallic surface is formed by performing a coating process on the surface of the sliding member.

(8) According to an eighth aspect, a refrigeration compressor according to the seventh aspect has been developed, wherein the coating for the coating process is selected from the group consisting of DLC (diamond carbon), DLC-Si (diamond carbon-silicon), CrN (chromium nitride), TiN (titanium nitride), TiCN (titanium carbonitride), TiAIN (titanium and aluminum nitride), WC / C (tungsten carbide coating) and VC (vanadium carbide).

(9) According to the ninth aspect, a refrigeration compressor according to any one of the first to sixth aspects has been developed, wherein the non-metallic portion is represented by a non-metallic support bearing member.

(10) According to a tenth aspect, a refrigeration compressor according to the ninth aspect has been developed, wherein the non-metallic support bearing member comprises PTFE (polytetrafluoroethylene) as a main component, or

POM (polyacetal).

(11) According to an eleventh aspect, a refrigeration compressor according to any one of the first to sixth aspects has been developed, wherein at least one of the components constituting the sliding portion is formed of a ceramic material.

(12) According to a twelfth aspect, a refrigeration compressor according to the eleventh aspect has been developed, wherein the ceramic material is selected from the group consisting of SiC (silicon carbide), ZrO ₂ (zirconia), Al ₂ O ₃ (alumina) and Si ₃ N ₄ (silicon nitride).

(13) According to a thirteenth aspect, a refrigeration compressor according to any one of the first to sixth aspects has been developed, wherein the non-metallic material is formed of a film of manganese phosphate.

(14) According to a fourteenth aspect, a refrigeration compressor according to any one of the first to eighth, eleventh and twelfth aspects has been developed, the compression element comprising an annular rolling piston arranged for eccentric rotation in the cylinder chamber and a vane mounted in the vane groove of the cylinder. and arranged for sliding movement in the vane groove when pressed against the rolling piston, and wherein the sliding part forms the front end of the blade and the outer circumference of the rolling piston.

(15) According to a fifteenth aspect, a refrigeration compressor according to any one of the first to eighth, eleventh and twelfth aspects has been developed, the compression element comprising a cylinder comprising a vane groove and a vane mounted in the vane groove of the cylinder and arranged for sliding movement in the vane. groove, and wherein the sliding portion is formed by a vane groove and a vane.

(16) According to a sixteenth aspect, a refrigeration compressor according to any one of the first to sixth, ninth, tenth and thirteenth aspects has been developed, the compression element comprising an annular rolling piston arranged for eccentric rotation in the cylinder chamber and a crankshaft having an eccentric a shaft portion which is eccentric to the main shaft portion, and wherein the sliding portion forms an inner circumference of the rolling piston and an eccentric shaft portion of the crankshaft.

(17) According to a seventeenth aspect, a refrigeration compressor according to any one of the first to sixth, ninth, tenth and thirteenth aspects has been developed, the compression element comprising a crankshaft having a main shaft portion and a secondary shaft portion, a main bearing arranged for sliding abutment. on the main shaft portion of the crankshaft, and a secondary bearing arranged to slide on the secondary shaft portion of the crankshaft, and wherein the slidable sliding portion comprises a main bearing, a secondary bearing and a crankshaft.

Claims (12)

PATENT CLAIMS A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the coolant and comprising a sliding member constituting the sliding member and a cooling oil adapted to be supplied to the sliding member to lubricate the sliding member, wherein at least one of the sliding surfaces of the sliding member is formed of a non-metallic material, and wherein a polymerization inhibitor adapted to suppress the polymerization of the refrigerant is contained in the cooling oil. 2. A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the refrigerant and comprising a sliding member which is a sliding member, the sliding member being a sintered member comprising a polymerization inhibitor adapted to suppress polymerization of the coolant, and wherein at least one of the sliding surfaces is slidable. The component is made of non-metallic material. 3. A refrigeration compressor adapted to compress ethylene fluorocarbon or a mixture containing ethylene fluorocarbon as a refrigerant, the refrigeration compressor comprising: a compression element arranged to compress the refrigerant and comprising a sliding member which is a sliding portion and an electrical element arranged to drive the compression element and comprising a winding, the polymerization inhibitor adapted to suppress the polymerization of the refrigerant being contained in the gap between the windings, and wherein at least one of the sliding surfaces of the sliding part is made of a non-metallic material. Refrigeration compressor according to any one of claims 1 to 3, characterized in that the ethylene fluorocarbon contains at least one substance selected from the group consisting of fluoroethylene (R1141), trans-1,2-difluoroethylene (R1132 (E)), cis-1 , 2 difluoroethylene (R1132 (Z)), 1, difluoroethylene (R1132a), and 1, 1, 2 trifluoroethylene (R1123). Refrigeration compressor according to any one of claims 1 to 4, characterized in that the polymerization inhibitor is a terpine compound. Refrigeration compressor according to claim 5, characterized in that the terpine compound is selected from the group consisting of limonene, pinene, camphene, cymene, terpinene, citronellol, terpineol and bornelol. Refrigeration compressor according to any one of claims 1 to 6, characterized in that the non-metallic surface is formed by carrying out a coating process on the surface of the sliding part. Refrigeration compressor according to claim 7, characterized in that the coating for the coating process is selected from the group consisting of DLC (diamond carbon), DLC-Si (diamond carbon-silicon), CrN (chromium nitride), TiN (titanium nitride) , TiCN (titanium carbonitride), TiAIN (titanium and aluminum nitride), WC / C (tungsten carbide coating) and VC (vanadium carbide). Refrigeration compressor according to any one of claims 1 to 6, characterized in that the non-metallic part is represented by a non-metallic support bearing member. A refrigeration compressor according to claim 9, distinguishing s e that non-metal supporting the bearing member comprises as the main part PTFE (polytetrafluoroethylene) or POM (polyacetal). 11. Refrigeration compressor according to of any of the claims 1 to 6, distinguishing s e that at least j edna of the components constituting the sliding part, it is made of a ceramic material. Refrigeration compressor according to claim 11, characterized in that the material is selected from the group consisting of SiC (silicon carbide), ZrO ₂ (zirconia), aluminum) and Si ₃ N ₄ (silicon nitride). ceramic containing A1 ₂ O ₃ (oxide Refrigeration compressor according to any one of claims 1 to 6, characterized in that the non-metallic material is formed by a film of manganese phosphate. 14. 11 and 12, contain y Refrigeration compressor according to any one of claims 1 to 8, characterized in that the compression element 15. 11 and 12, comprise an annular rolling piston arranged for eccentric rotation in the cylindrical chamber of the cylinder, and a vane mounted in the vane groove of the cylinder and arranged for sliding movement in the vane groove when pressed against the rolling piston, and the sliding part forming the front end of the blade and the outer circumference of the rolling piston. Refrigeration compressor according to any one of claims 1 to 8, characterized in that the compression element is a cylinder comprising a vane groove and a vane mounted in the vane groove of the cylinder and arranged for sliding movement in the vane groove, and wherein the sliding portion is formed by a vane groove and shovel. A refrigeration compressor according to any one of claims 1 to 6, 9, 10 and 13, characterized in that the compression element comprises an annular rolling piston arranged for eccentric rotation in the cylinder chamber of the cylinder, and a crankshaft having an eccentric shaft part which is eccentric to the main shaft part, and wherein the sliding slide part forms the inner circumference of the rolling piston and the eccentric shaft part of the crankshaft. Refrigeration compressor according to any one of claims 1 to 6 9, 10 and 13, characterized in that the compression element comprises a crankshaft having a main shaft portion and a secondary shaft portion a main bearing arranged for sliding abutment on the main shaft portion of the crankshaft, and a secondary bearing arranged for sliding abutment on the secondary a shaft portion of the crankshaft, and wherein the sliding portion comprises a main bearing, a secondary bearing, and a crankshaft. List of reference marks cylinder vane groove chamber 1b cylinder 1 chamber 1c back pressure rolling piston outer circumference 2a of rolling piston 2 inner circumference 2b of rolling piston 2 vane front end 3a vanes 3 side surface part 3b vanes 3 main bearing secondary bearing crankshaft eccentric shaft part main shaft part secondary shaft part discharge damper vane spring support bearing member stator stator iron core three-phase winding insulating member rotor rotor iron core upper end plate lower end plate sealed container suction damper suction pipe guide wire terminal 25 discharge pipe 30 cooling oil 101 compression element 102 electrical element 200 rotary compressor 1/4