CN101275786A

CN101275786A - Refrigeration cycle apparatus

Info

Publication number: CN101275786A
Application number: CNA2008100045952A
Authority: CN
Inventors: 坪江宏明; 中村宪一
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Johnson Controls Air Conditioning Inc
Priority date: 2007-03-28
Filing date: 2008-01-25
Publication date: 2008-10-01
Anticipated expiration: 2028-01-25
Also published as: JP4370478B2; CN101275786B; JP2008241196A; EP1975527A3; EP1975527B1; EP1975527A2

Abstract

To provide a refrigeration cycle apparatus capable of effectively reusing existing pipes, the refrigeration cycle apparatus is formed by connecting a compressor (1), a heat source unit side heat exchanger (3), an expansion device (4, 9a, 9b) and a using side heat exchanger (10a, 10h) by means of a liquid refrigerant pipe (7) and a gas refrigerant pipe (12). The gas refrigerant pipe (12) is provided with a strainer (14), and the liquid refrigerant pipe (7) is provided with a receiver (5) in which an opening of each of pipes (51, 52) on an upstream side and a downstream side of the liquid refrigerant is provided, and in which a filter device which defines a space (62) at each of the openings, and has two filters (53, 54) for capturing different target objects, respectively, discharged from the refrigerant pipe is provided.

Description

Freezing cycle device

Technical field

The present invention relates to freezing cycle device, relate in particular to and be suitable for freezing cycle device that the residual pipe of establishing that solid foreign materials and liquid impurity arranged is utilized again.

Background technology

As utilizing the liquid refrigerant pipe arrangement to be connected compressor, thermal source pusher side heat exchanger, expansion gear with the gas refrigerant pipe arrangement and utilizing the side heat exchanger and form the freezing cycle device of freeze cycle, air regulator is for example arranged.

In air regulator, for corresponding environmental problem etc., the demand of existing air regulator (below, be called second-hand machine) being replaced by new air regulator (below, be called new engine) increases gradually.In described existing air regulator, use CFC class cold-producing medium or HCFC class cold-producing medium etc. as cold-producing medium, use the mineral wet goods as refrigerator oil; In described new air regulator, use and do not have the HFC class cold-producing medium of intermiscibility and the refrigerator oil that HFC class cold-producing medium is used with the mineral wet goods.When carrying out this replacing, utilize the indoor set of connection second-hand machine and the refrigerant piping of having established of off-premises station again.

But, sometimes have and the insoluble or weak solvent components of the employed HFC class of new engine cold-producing medium in that the inside of the connecting pipings that utilizes again is residual, that is the polluter (liquid impurity) of the oxidative degradation reactant of the refrigerator oil (mineral oil, alkylbenzene etc.) of inclosure second-hand machine, refrigerator oil, chlorine compounds etc..

And, produce at the sliding part place that is loaded into the coolant compressor on the second-hand machine under the situation of noticeable wear, the solid foreign materials that generation causes because of a large amount of abrasion powders is discharged outside coolant compressor with gas refrigerant and refrigerator oil, remains in the connecting pipings that utilizes again.

If these impurity and solid foreign materials are not taked any measure and are utilized establishing pipe again, the deterioration of the refrigerator oil in the new engine that then might aggravate to cause because of impurity, or sneak into wearing and tearing of the sliding part that is loaded in the coolant compressor that the coolant compressor on the new engine causes etc. because of solid foreign materials, might destroy the reliability of air regulator thus significantly.

For example, in patent documentation 1, put down in writing following construction method, promptly, for the deterioration of the refrigerator oil in the new engine, when vacuumizing, in pipe arrangement, enclose with new engine in identical refrigerator oil, the impurity that will remain in the connecting pipings be set in below the permissible value with respect to the concentration of the refrigerator oil in the new engine.And, in patent documentation 2 for example, put down in writing when utilizing connecting pipings, reclaimed the technology of the cleaning running that remains in the impurity in the connecting pipings.

And,, have coarse filter etc. is arranged between new engine heat source side assembly and the connecting pipings, prevents that a large amount of solid foreign materials from flowing into the method for coolant compressor for the wearing and tearing of solid foreign materials to the sliding part of the coolant compressor of new engine.Coarse filter is just like the coarse filter described in the patent documentation 3 as used herein.

Patent documentation 1: TOHKEMY 2003-42603 communique

Patent documentation 2: TOHKEMY 2000-9368 communique

Patent documentation 3: TOHKEMY 2002-224513 communique

But, in these existing technology, do not have to consider the technology that establishing pipe is utilized expeditiously again.

That is, might enclose operation or clean running operation etc. because of appending the refrigerator oil that following operation etc. is meant the more situation of the time lengthening of newly built construction, described operation for example to be used for the concentration with impurity to be set in below the permissible value.

Therefore, problem of the present invention provides the freezing cycle device that can be expeditiously establishing pipe be utilized again.

Summary of the invention

In order to solve above-mentioned problem, freezing cycle device of the present invention utilizes the liquid refrigerant pipe arrangement to be connected compressor, thermal source pusher side heat exchanger, expansion gear with the gas refrigerant pipe arrangement and utilizes the side heat exchanger, forms freeze cycle.And, coarse filter is arranged on the gas refrigerant pipe arrangement, simultaneously, container is arranged on the liquid refrigerant pipe arrangement.And, each peristome of the pipe arrangement in the upstream side of liquid refrigerant and downstream is set in container, simultaneously, filter for installation is set, this filter for installation has in each peristome division space and catches respectively from two filters of the different captured object thing of refrigerant piping discharge.

In this case, from the different captured object thing that refrigerant piping is discharged, can be to carry out the solid foreign materials of cold-producing medium circulation and do not dissolve or at least one side's of weak dissolving liquid impurity with respect to cold-producing medium with cold-producing medium.

Like this, with the mobile solid foreign materials of cold-producing medium, catch by coarse filter on the stream that is arranged on gas refrigerant and the filter that is arranged on the side on the liquid refrigerant stream, therefore, even the flow direction of cold-producing medium changes in the refrigeration and heating running, also can suppress to flow into compressor.And, the composition of or weak dissolving insoluble, promptly enclose the liquid impurity of the refrigerator wet goods of second-hand machine with cold-producing medium, catch owing to be set at the filter of the opposing party in the liquid refrigerant stream, therefore, can suppress the deterioration of the refrigerator oil in the new engine.Therefore,, need not to append the operation of enclosing refrigerator oil or append and clean running operation etc., can be expeditiously establishing pipe be utilized again when the establishing pipe utilizes again.

And, constitute expansion gear by first expansion gear and second expansion gear, with container as be arranged between first expansion gear and second expansion gear, the holder of storaging liquid cold-producing medium.

And, be used in two filters of two-layer formation up and down that the upper strata is caught the filter of liquid impurity and caught the filter of solid foreign materials in lower floor, simultaneously, preferably utilize the filter of catching solid foreign materials to divide the space of each peristome of refrigerant piping.

Because the liquid impurity and the liquid refrigerant of mineral wet goods almost are insoluble, therefore, separate, and proportion is littler than liquid refrigerant with liquid refrigerant, therefore, to more the top is mobile.Therefore, in being stored in the liquid refrigerant of holder,, can catch liquid impurity expeditiously by the filter of catching aqueous impurity is set in upper layer side.And owing to pass through the space that the filter of lower layer side is divided each peristome of refrigerant piping, therefore, solid foreign materials is in case from the refrigerant piping discharge, then caught by this filter at once.

And according to such formation, because it is milder that the velocity ratio of liquid refrigerant at position of filter of upper layer side is set, therefore, the liquid impurity that can suppress temporarily to be captured flows out along with flowing of cold-producing medium once more.

And filter for installation internal face best and holder is arranged in the holder with having predetermined distance.This is in order to be suppressed in the process of making the filter for installation in holder and the holder, and the wall surface temperature of holder forms high temperature because of welding waits, and problems such as fusion take place above the durable temperature of filter filter.

And, the available HFC of having refrigerator oil can by and the fibrous material that can catch the mesh count of the solid foreign materials more than the number μ m form to catch the filter of solid foreign materials, the available HFC of having refrigerator oil can by and the fibrous material that can catch the mesh count of mineral oil form the filter of catching liquid impurity.

And, utilize the fibrous material formation of polyester to catch the filter of liquid impurity and the filter of seizure solid foreign materials, and can make the filter of the density of the filter of catching solid foreign materials greater than the seizure liquid impurity.

And, coarse filter can be arranged on and utilize between side heat exchanger and the compressor, utilization can be caught the filter screen of the SUS formation coarse filter of the above solid foreign materials of number μ m.

And, when compressor start and under at least a situation in when stopping, by control first expansion gear and second expansion gear either party, make it open or form small aperture fully, liquid refrigerant can be recovered in the holder, can catch liquid impurity more effectively.

According to the present invention, can provide the freezing cycle device that can be expeditiously establishing pipe be utilized again.

Description of drawings

Fig. 1 is the refrigerating circulation system figure of air regulator of the present invention.

Fig. 2 is the circulatory system figure of other embodiment of the present invention.

Fig. 3 is the chart that expression HFC class cold-producing medium, HFC use the mineral oil stalling characteristic under refrigerator oil and the mineral oil coexisting state.

Fig. 4 is holder and the longitudinal section that is arranged on the filter for installation in the holder.

Fig. 5 is the cutaway view that solids is caught coarse filter.

The specific embodiment

Below, utilize Fig. 1 to Fig. 5 that the embodiment that is suitable for freezing cycle device of the present invention is described.In addition, in the following description, air regulator is described as an example, but be not limited thereto, the present invention is applicable to the freezing cycle device that forms freeze cycle and establishing pipe is utilized again.And embodiment is to be that example describes with the multiple air regulator that many indoor sets are connected with an off-premises station, but is not limited thereto, also applicable to the air regulator that connects one to one.In the following description, the parts of identical function use identical symbol, and omit repeat specification.

Fig. 1 is the refrigerating circulation system figure of the air regulator of present embodiment.As shown in the figure, air regulator is made of off-premises station 30,

indoor set

40a, 40b, the liquid refrigerant pipe arrangement 7 that connects these and gas refrigerant pipe arrangement 12 etc.

Off-premises station 30 has compressor 1, cross valve 2, thermal source pusher side heat exchanger 3, outdoor expansion valve 4, holder 5, accumulator 15 etc., utilizes refrigerant piping that these are connected and composed.And, be provided with at the connector of liquid refrigerant pipe arrangement 7 and gas refrigerant pipe arrangement 12 and stop valve (prevention man's cap used in ancient times) 6,13, solids to catch coarse filter 14a to be arranged on the refrigerant piping of suction side of compressor 1.And each

indoor set

40a, 40b have

indoor expansion valve

9a, 9b and utilize side heat exchanger 10a, 10b etc., utilize refrigerant piping that these are connected and composed.

Fig. 2 is the figure of variation of the air regulator of present embodiment.Different with Fig. 1 just solids catch coarse filter 14 that the position is set is different.That is, in Fig. 1, the suction side of the compressor 1 in off-premises station 30 is provided with solids and catches coarse filter 14a, and as shown in Figure 2, also solids can be caught coarse filter 14b and be arranged on the gas refrigerant pipe arrangement 12 and replaced.

In such air regulator, when upgrading off-premises station 30 and

indoor set

40a, 40b, can utilize again liquid refrigerant pipe arrangement 7 and gas refrigerant pipe arrangement 12.But, if simply these pipe arrangements of having established are utilized again, the liquid impurity (refrigerator oil of the mineral oil of inclosure second-hand machine, alkylbenzene etc., the oxidative degradation reactant of refrigerator oil, chlorine compounds etc.) that then remains in the pipe arrangement will make the refrigerator oil deterioration in the new engine, perhaps sneak into the wearing and tearing etc. of the sliding part that will speed up coolant compressor in the coolant compressor that is loaded on the new engine, might obviously destroy the reliability of air regulator thus because of solid foreign materials.

Below, just reclaim the solid foreign materials that remains in the establishing pipe and the method for impurity and describe.In addition, as an example that remains in the impurity in the establishing pipe, utilize mineral oil to describe.

Under the aging situation of the conditioner that uses CFC or HCFC, need to change conditioner.At first, reclaim CFC or HCFC cold-producing medium, off-premises station 30 and

indoor set

40a, 40b are replaced with device shown in Figure 1.Liquid connecting pipings 7 and gas connecting pipings 12 use the pipe arrangement of second-hand machine.Owing to HFC is filled in the off-premises station 30 in advance, therefore, keep closing the state that stops valve 6,13, under connection status,

indoor set

40a, 40b, liquid connecting pipings 7 and gas connecting pipings 12 are vacuumized, replenish and fill HFC, open prevention valve 6,13 afterwards.

Elemental motion as air regulator, when carrying out cooling operation, gas refrigerant by the HTHP of compressor 1 compression is discharged from compressor 1, and gas refrigerant flows into thermal source pusher side heat exchangers 3 through cross valve 2, carries out heat exchange, condensation liquefaction at this.First expansion gear of cold-producing medium behind the condensation liquefaction by opening fully, be outdoor expansion valve 4, remaining cold-producing medium is stored in the holder 5, and remaining is transported to

indoor set

40a, 40b by stoping valve 6.

The liquid refrigerant that is transferred flows into indoor expansion valve 9a, the 9b as second expansion gear, be decompressed to low pressure, form low pressure two-phase state at this, carry out heat exchange at the side medium that utilizes that utilizes side heat exchanger 10a, 10b and air etc., evaporate, gasify.Afterwards, gas refrigerant is caught coarse filter 14b, is stoped valve 13, cross valve 2 to return compressor 1 through solids in Fig. 2, returns compressor 1 through stoping valve 13, cross valve 2, solids to catch coarse filter 14a in Fig. 1.

When heating is turned round, gas refrigerant by the HTHP of compressor 1 compression is discharged from compressor 1 with refrigerator oil with HFC, through cross valve 2, stop solids among valve 13, Fig. 2 to catch coarse filter 14b to flow into and utilize side heat exchanger 10a, 10b, utilize the side medium to carry out heat exchange, condensation liquefaction at this and air etc.Cold-producing medium behind the condensation liquefaction flows into and stops valve 6, holder 5, in the decompression of outdoor expansion gear 4 places, carries out heat exchange and evaporates, gasifies at thermal source media such as thermal source pusher side heat exchanger 3 places and air, water.Cold-producing medium after the gasification is caught coarse filter 14a through the solids among cross valve 2, Fig. 1, returns compressor 1.

Fig. 3 be expression with respect to HFC class cold-producing medium and HFC with refrigerator oil, sneak into about 10% the composition that is insoluble to HFC class cold-producing medium, be the figure of the stalling characteristic of the mineral oil under the situation of mineral oil (=mineral oil mass/(HFC usefulness refrigerator oil mass+mineral oil mass)).Transverse axis is represented the cold-producing medium solubility in refrigerator oil (HFC refrigerator oil+mineral oil), and 0% expression has only the situation of refrigerator oil (HFC refrigerator oil+mineral oil), and 100% expression has only the situation of cold-producing medium.The longitudinal axis is represented temperature.

As shown in the drawing, mineral oil is dissolved in HFC class cold-producing medium hardly, and is dissolved in the HFC refrigerator oil.And mineral oil does not separate in the compressor that exists many HFC with refrigerator oil, and separates in liquid connecting pipings 7 that has many liquid refrigerants and holder 5.

Below, utilize Fig. 4 just to be arranged on and describe as the filter for installations in the holder 5 of the feature portion of present embodiment.Filter for installation constitutes by form bilevel

different filter

53,54 etc. in holder 5.Filter 53 is arranged on the upper strata in the holder 5, is the many fibrous materials of mesh count, and the material of this fiber is by polyester, polyacrylic at least a formation.

Liquid refrigerant and the HFC refrigerator oil that is dissolved in liquid refrigerant are obviously low liquid of viscosity.And mineral oil and liquid refrigerant and the HFC that is dissolved in liquid refrigerant compare, are obviously high liquid of viscosity with refrigerator oil.Therefore, by filter 53, and mineral oil is stuck between the fiber of the many filters 53 of mesh count, is caught in fibrous inside by capillarity afterwards with refrigerator oil for liquid refrigerant and the HFC that is dissolved in liquid refrigerant.

Therefore, by filter 53 is arranged in the holder 5, separate in holder 5 from compressor 1 interior mineral oil of discharging with refrigerator oil with HFC, 53 of available filter are caught the mineral oil after this separation.

Form as compressor 1, the hyperbaric chamber mode that the pressure of the refrigerator oil storage portion in compressor 1 is high or separator is arranged under the situation of discharge portion of compressor 1, be stored in the compressor 1 or separator in the temperature of refrigerator oil form high temperature.On the other hand, the temperature of holder 5 is lower than this temperature.And, temperature rises and more impels the refrigerator oil deterioration, and, the mixed volume that remains in the mineral oil (deterioration oil) in the establishing pipe is many more, impel HFC refrigerator oil deterioration more, therefore, catch mineral oil by the holder 5 that utilizes in the ratio piston compressor 1 or the temperature in the separator is low, can suppress the deterioration of HFC with refrigerator oil.

And,, filter 53 is contacted with mineral oil for mineral oil being captured on the filter 53.Therefore, when compressor 1 starting and when compressor stops, with the expansion gear in the downstream of holder 5 (if then be

indoor expansion valve

9a, 9b when the cooling operation, if when heating is turned round, then be outdoor expansion valve 4) set full cut-off for or turn round near the little aperture of full cut-off, with refrigerant-recovery in holder 5.

By like this, because HFC class cold-producing medium, HFC are contacted with filter 53 with the mixed liquor of refrigerator oil and mineral oil, therefore, a separating mineral oil in holder 5 is so can only catch mineral oil.

And big more with respect to the flow velocity of filter 53, the seizure amount of the mineral oil of filter 53 is few more.This is owing to the fluid force that is filtered cooled dose of device 53 interim mineral oil of catching is released to the outside of filter 53.And, owing to import and export and manage near 51,52 the pipe leading section the closer to HFC class cold-producing medium, HFC are imported cold-producing mediums in the holder 5 with the mixed liquor of refrigerator oil and mineral oil, the inflow velocity of mixed liquor is big more, therefore, make the pipe leading section towards below, make the HFC class cold-producing medium that imports in the holder 5, HFC with the mixed liquor of refrigerator oil and mineral oil by behind the filter 53, from holder 5 derivation.By like this, can suppress to import holder 5 interior mineral oil and not derive by filter 53.

Pass through said structure, need not as prior art, to carry out following operation, promptly, be set in permissible value when following in concentration with impurity, to notice that simultaneously preventing to sneak into pollutant simultaneously encloses, and can suppress the more time of newly built construction thus from refrigerator oil, the special-purpose flexible pipe of utilization that refrigerator oil producer provides with can container.And, the refrigerator oil that can suppress to append is enclosed the such problem of existing method in the new engine in advance, promptly, when the long mansion of connecting pipings is upgraded with multi-connected air conditioner, by in new engine, enclosing the volume of new engine is increased, new engine can not be set corresponding to a large amount of refrigerator oils that remain in a large amount of impurity in the connecting pipings.

And, when connecting pipings is utilized again, need not to reclaim the cleaning running that remains in the impurity in the connecting pipings, therefore, can control the activity duration of upgrading engineering, utilize establishing pipe expeditiously again.

And, being arranged on the filter 54 of the lower floor of filter 53, the cold-producing mediums that are arranged in the holder 5 import and export near the pipe leading section of pipe 51,52.In other words, import and export the space 62 of the leading section of

pipe

51,52 by filter 54 sharing system cryogens.Filter 54 is the fibrous materials greater than filter 53, has the mesh count that can remove number μ m solid foreign materials.That is, the fibrous material that comparing with filter 53 is the intensive coincidence of fiber, interfibrous space is little, density is big is as the character of this fiber, at least by a kind of formation the among polyester, polypropylene, the SUS.

As the filter 53 of catching mineral oil, owing to by capillarity mineral oil to be captured fibrous inside, therefore, to obtain the interfibrous space of filter 53 greatly in order trying one's best, and set the amount of seizable mineral oil in large quantities, preferably set the density different for filter 54.In addition, with filter 54 be arranged to surround cold-producing medium import and

export pipe

51,52 the pipe leading section near, make to import and export the solid foreign materials that pipe 51,52 imports from cold-producing medium and in holder 5, do not derive.

At this, it is the above solid foreign materials of 20 μ m that the coarse filter of seizure solid foreign materials of the prior art can be caught particle diameter.But, distribute by the particle diameter of measuring the solid foreign materials that from actual machine, reclaims, the result who obtains be particle diameter be 20 μ m following more than half, described solid foreign materials produces by the sliding part wearing and tearing of coolant compressor, in can catching the coarse filter that particle diameter is the solid foreign materials more than the 20 μ m, particle diameter is that the following solid foreign materials of 20 μ m flows into coolant compressor.

And, in document [" lubricating ", the 17th volume, o.11 (1972) 741～746], minimum clearance on the sliding bearing that also adopts in the coolant compressor is 1～20 μ m, has put down in writing the situation that promotes the wearing and tearing of sliding part under the condition that the minimum clearance at the particle diameter of solid foreign materials and bearing equates, the most in document [" tribology and environment ", Xin Shushe, 53 pages, Figure 22 37 (b)].

About this point, in the present embodiment,, import and export solid foreign materials that pipe 51,52 discharges from cold-producing medium and import and export on the face of

pipe

51,52 sides attached to the cold-producing medium of filter 54 by above-mentioned structure.Its result can suppress following situation, that is, solid foreign materials is sneaked in the compressor that is loaded on the new engine, quickens the wearing and tearing of the sliding part of compressor, destroys the reliability of air regulator.

In addition, in order to suppress solid foreign materials blocking filter 54, guarantee fully that preferably the cold-producing medium of filter 54 imports and exports the area of

pipe

51,52 sides.

The method to set up of filter 54 of removing solid foreign materials of filter 53, lower floor of the insoluble composition of removing cold-producing medium that below just is built in the upper strata of holder 5 describes.

During fabrication, after clamping

filter

53,54 with reinforcement metal (パ Application チ Application グメ Le) 55,56, welded

cover

58,59 and main body 60.At this moment, the temperature of the internal face of main body 60 surpasses the maximum operation (service) temperature of filter 53,54.Therefore, if filter the 53, the 54th, with the internal face contacting structure of main body 60, then filter 53,54 can not be caught the insoluble composition of cold-producing medium because of the heat fusion.And, import the liquid refrigerant in the holder 5 and be dissolved in HFC refrigerator oil in the liquid refrigerant, because of the stream that blocks in the holder 5 is not derived in holder 5, generation stops because of the discharge temperature of compressor 1 machine that causes that too raises, or because of the wearing and tearing of the not enough sliding part that causes of the refrigerator oil in the compressor 1.

Therefore, in the present embodiment, between main body 60 and

filter

53,54 predetermined gap Δ d is set, the temperature that suppresses main body 60 internal faces is to the filter transmission, and the temperature that makes

filter

53,54 is below maximum operation (service) temperature.

As shown in Figure 5, the structure that solids is caught coarse filter 14a, 14b is, connect the importing cover 71 of central portion opening a side, circle tube leaching net 70 is enclosed in the inside of pressure vessel 74 in the opposing party's bottom surface, this circle tube leaching net 70 is provided with filter screen, catches solid foreign materials.Connect importing cover 71 and filter screen 70 by welding whole circumference direction, prevent that solid foreign materials is from importing the connecting portion inflow and outflow of cover 71 and filter screen 70.

And the inner face of pressure vessel 74 is connected with importing cover 71, also by in the riveted joint of whole circumference direction or in the welding of whole circumference direction, prevents the inflow and outflow of solid foreign materials.

Catch the flowing of cold-producing medium, refrigerator oil and solid foreign materials of coarse filter 14a, 14b inside for solids, at first during from pipe arrangement 72 side inflows, flow according to solid arrow at cold-producing medium, refrigerator oil and solid foreign materials.Cold-producing medium and refrigerator oil pass filter screen aperture portion, go out from pipe arrangement 73 effluents.Because the particle diameter solid foreign materials bigger than the aperture portion of filter screen 70 can not pass through filter screen 70, therefore caught by the inner face of filter screen 70.

And, the flowing of cold-producing medium, refrigerator oil and the solid foreign materials the when arrow of dotted line represents to carry out the opposite cycle operation of the dual-purpose machine of refrigeration and heating etc.

As shown in Figure 2, be arranged on gas connecting pipings 12 and gas and stop under the situation between the valve 13 solids being caught coarse filter 14b, the fluid force of the solid foreign materials that is trapped in filter screen 70 inner faces by cold-producing medium and refrigerator oil might flow out to the outside that solids be caught coarse filter 14b.But, can catch coarse filter 14b and be arranged on holder 5 interior filters 54 by solids solid foreign materials is closed in liquid refrigerant pipe arrangement 7, gas refrigerant pipe arrangement 12, prevent to flow in the coolant compressor 1.

The material of the filter screen 70 that solids seizure coarse filter 14a, 14b are adopted is the SUS system preferably, that is, preferably following material, this material can be caught particle diameter for counting the above solid foreign materials of μ m, can not make employed cold-producing medium, refrigerator oil deterioration, filter screen 70 itself can deterioration yet.

And according to the record in the document [" tribology and environment ", Xin Shushe, 53 pages, Figure 22 37 (c)], the foreign matter amount of supplying with to the bearing sliding part increases more, and the wear extent of bearing portion increases more.Therefore, specification as coolant compressor 1, set the permissible value of solid foreign materials mixed volume, if be below the permissible value of above-mentioned solid foreign materials mixed volume, even it is also no problem by filter screen 70, inflow coolant compressor 1 then to remain in the part of the solid foreign materials in liquid refrigerant pipe arrangement 7, the gas refrigerant pipe arrangement 12.

That is, be the above solid foreign materials of number μ m though the filter screen 70 that solids seizure coarse filter 14a, 14b are adopted is caught particle diameters, catch rate is also no problem below 100%.

And,, also can utilize the parts of high strength such as reinforcement metal to strengthen the interior week and the periphery of filter screen 70 in order to bear fluid force from cold-producing medium and refrigerator oil.

At this moment, as shown in Figure 1, be arranged under the situation of suction side of compressor 1 remaining in the solid foreign materials in liquid refrigerant pipe arrangement 7, the gas refrigerant pipe arrangement 12 and all concentrate on the solids seizure coarse filter 14a because of the aging all the year round abrasion powder that produces of compressor 1 solids being caught coarse filter 14a as the solid foreign materials in the freeze cycle.Therefore, guarantee that fully solids is caught the area of the filter screen 70 of coarse filter 14a, made solids catch coarse filter 14a is not very important by the solid foreign materials obstruction.

As shown in Figure 2, be arranged on gas connecting pipings 12 and gas and stop under the situation between the valve 13 solids being caught coarse filter 14b, when carrying out cooling operation, the solid foreign materials that only remains in liquid refrigerant pipe arrangement 7, the gas refrigerant pipe arrangement 12 flows into solids seizure coarse filter 14b.On the other hand, when heating is turned round, have only the aging all the year round abrasion powder that produces to flow into solids seizure coarse filter 14b because of compressor 1.Therefore, the amount that flows into the solid foreign materials of solids seizure coarse filter 14b is less than solids and catches coarse filter 14a, can set the area that solids is caught the filter screen 70 of coarse filter 14b lessly, can form miniaturization.

Claims

1. freezing cycle device utilizes the liquid refrigerant pipe arrangement to be connected compressor, thermal source pusher side heat exchanger, expansion gear with the gas refrigerant pipe arrangement and utilizes the side heat exchanger, forms freeze cycle, it is characterized in that,

Coarse filter is arranged on the described gas refrigerant pipe arrangement, simultaneously, container is arranged on the described liquid refrigerant pipe arrangement,

Each peristome of the pipe arrangement in the upstream side of described liquid refrigerant and downstream is set in this container, simultaneously, is arranged on two filters that this each peristome is divided space and caught the different captured object thing of discharging from refrigerant piping respectively.

2. freezing cycle device as claimed in claim 1, it is characterized in that, from the different captured object thing that described refrigerant piping is discharged, be to carry out the solid foreign materials of cold-producing medium circulation together with cold-producing medium and relative described cold-producing medium does not dissolve or at least one side's of weak dissolving liquid impurity.

3. freezing cycle device as claimed in claim 1, it is characterized in that, above-mentioned expansion gear has first expansion gear and second expansion gear, and described container conduct is arranged between first expansion gear and second expansion gear, the holder of storaging liquid cold-producing medium.

4. freezing cycle device as claimed in claim 3, it is characterized in that, described two filters form two-layer up and down, the filter of catching described liquid impurity is set on the upper strata, in lower floor the filter of catching described solid foreign materials is set, the space of described each peristome is divided by the filter of catching above-mentioned solid foreign materials.

5. freezing cycle device as claimed in claim 4 is characterized in that the internal face of described two filters and described holder is arranged in the described holder with having predetermined distance.

6. as claim 4 or 5 described freezing cycle devices, it is characterized in that, catch the filter of described solid foreign materials, by have the HFC refrigerator oil can by and the fibrous material that can catch the mesh count of the solid foreign materials more than the number μ m form, catch the filter of described liquid impurity, by have the HFC refrigerator oil can by and the fibrous material that can catch the mesh count of mineral oil form.

7. as claim 4 or 5 described freezing cycle devices, it is characterized in that, catch the filter of described liquid impurity and the filter of the described solid foreign materials of seizure, fibrous material by polyester forms, and makes the filter of the density of the filter of catching described solid foreign materials greater than the described liquid impurity of seizure.

8. as claim 4 or 5 described freezing cycle devices, it is characterized in that described coarse filter is arranged on described the utilization between side heat exchanger and the compressor, the filter screen of this coarse filter is formed by the SUS that can catch the solids more than the number μ m.

9. as claim 4 or 5 described freezing cycle devices, it is characterized in that, when described compressor start and under at least a situation in when stopping, making either party Close All of described first expansion gear and second expansion gear or form small aperture.

10. a freezing cycle device utilizes refrigerant piping connection compressor, cross valve, thermal source pusher side heat exchanger, first expansion gear, holder, second expansion gear and utilizes the side heat exchanger, forms freeze cycle, it is characterized in that,

Utilize between side heat exchanger and the described compressor described, seizure is set carries out the coarse filter of the solid foreign materials of described freeze cycle with cold-producing medium, simultaneously, in described holder, be provided with and catch described solid foreign materials and do not dissolve or the filter for installation of at least one side's of weak dissolving liquid impurity with respect to cold-producing medium

Described filter for installation, be provided with on the upper strata that seizure is not dissolved with respect to cold-producing medium or the filter of at least one side's of weak dissolving liquid impurity, in lower floor the filter of the described solid foreign materials that seizure discharges from refrigerant piping is set, the filter by catching this solids, the upstream side of the refrigerant piping in inserting described holder and each peristome in downstream are divided space.