CN101379351B - Method of recovering refrigerator oil - Google Patents
Method of recovering refrigerator oil Download PDFInfo
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- CN101379351B CN101379351B CN2007800044629A CN200780004462A CN101379351B CN 101379351 B CN101379351 B CN 101379351B CN 2007800044629 A CN2007800044629 A CN 2007800044629A CN 200780004462 A CN200780004462 A CN 200780004462A CN 101379351 B CN101379351 B CN 101379351B
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- gaseous state
- cold
- producing medium
- loop
- connecting pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B45/00—Arrangements for charging or discharging refrigerant
Abstract
A method of recovering refrigerator oil has a first step and a second step that are performed in sequence. In the first step, the refrigerator oil is recovered from a gas side port (28) together with a part of refrigerant in that part of a refrigerant circuit (20) which communicates with the gas side port (28). The gas side port (28) is open to an interconnecting line (24) that is on the gas side of the position closed by a closing valve (26) installed at one end of a heat source side circuit (21). In the second step, the refrigerator oil is recovered from a liquid side port (27), with the gas side closing valve (26) closed, together with a part or the whole of the refrigerant in that part of the refrigerant circuit (20) which communicates with the liquid side port (27). The liquid side port (27) is open to an interconnecting line (23) that is on the liquid side of the position closed by a closing valve (25) installed at the other end of the heat source side circuit (21).
Description
Technical field
The present invention relates to a kind of recovery method of refrigerator oil, the recovery method of this refrigerator oil is used for reclaiming refrigerator oil from this gaseous state side connecting pipe and this liquid state side connecting pipe in the refrigerating plant that comprises the thermal source unit and utilize unit to couple together by gaseous state side connecting pipe and liquid side connecting pipe the refrigerant loop that constitutes.
Background technology
Up to now, about comprising the thermal source unit and utilizing unit to couple together the refrigerating plant of the refrigerant loop that constitutes by connecting pipe, the method that is used for removing efficiently the refrigerator oil in the described connecting pipe is known.The recovery method of this refrigerator oil is for example being changed the thermal source unit and is being utilized unit and utilize when still using former connecting pipe.
Particularly, in patent documentation 1, there is the people to disclose the recovery method of oil residues recovery method as this refrigerator oil.In this oil residues recovery method, after carrying out that the cold-producing medium of refrigerant loop collected finding time in the thermal source loop (pump down), carry out cold-producing medium and take in action and cold-producing medium and fill and move.When cold-producing medium is taken in action, side in liquid side stop valve (stop valve) and the gaseous state side stop valve is closed and the opposing party is opened, recover is connected on the valve port of the stop valve of closing, in recover, reclaims the cold-producing medium in refrigerator oil and the refrigerant loop more together.When filling action, cold-producing medium is set at: that stop valve of closing when cold-producing medium is taken in action is opened, and that stop valve of opening when cold-producing medium is taken in action is closed.Then, be connected the recover of taking in the cold-producing medium that when cold-producing medium is taken in action, reclaims on the valve port of that stop valve of closing by the cold-producing medium regenerator, make this recover ejection cold-producing medium again, will be filled in the refrigerant loop with the cold-producing medium that the cold-producing medium regenerator is removed behind the refrigerator oil.In this oil residues recovery method, carry out cold-producing medium repeatedly and take in action and cold-producing medium filling action according to necessity.
Patent documentation 1: Japanese publication communique spy opens the 2003-194437 communique
In the recovery method of existing refrigerator oil, if will from connecting pipe, reclaim more refrigerator oil, just be necessary that not only carrying out cold-producing medium takes in action, fill action but also carry out cold-producing medium.In other words, also carry out cold-producing medium then and take in action, so need carry out three actions at least carrying out carrying out cold-producing medium filling action after cold-producing medium is taken in action because be necessary.Therefore, very big for the required labour of the work of reclaiming refrigerator oil.
Summary of the invention
The present invention, described problem researchs and develops out in order to solve just.Its purpose is: reclaiming in the method for refrigerator oil, reclaim refrigerator oil efficiently from the connecting pipe of the refrigerating plant that comprises the thermal source unit and utilize unit to couple together by connecting pipe the refrigerant loop that constitutes, and alleviate the labour when reclaiming.
First invention, recovery method with following refrigerator oil is an object, that is: with the heat source side loop in the thermal source unit and utilize and utilize side loop to connect the refrigerant loop that constitutes to carry out in the refrigerating plant of kind of refrigeration cycle the method for recovery refrigerator oil from this gaseous state side connecting pipe and this liquid state side connecting pipe in the unit by gaseous state side connecting pipe and liquid side connecting pipe.In the recovery method of this refrigerator oil, carry out the first step and second step successively, in this first step, reclaim the neutralize part of cold-producing medium of the part that this gaseous state side valve mouth is communicated with of refrigerator oil and described refrigerant loop together from gaseous state side valve mouth, this gaseous state side valve mouth in the gaseous state side stop valve of an end that is arranged at described heat source side loop than the closed position also near the position upper shed of gaseous state side connecting pipe one side; In this second step, under the state of closing described gaseous state side stop valve, reclaim a neutralize part or the integral body of cold-producing medium of the part that this liquid state side valve mouth is communicated with of refrigerator oil and described refrigerant loop together from liquid side valve mouth, this liquid state side valve mouth in the liquid side stop valve of the other end that is arranged at described heat source side loop than the closed position also near the position upper shed of liquid side connecting pipe one side.
Second invention is in first invention, carries out described first step under the state of closing described gaseous state side stop valve.
The 3rd invention is in first or second invention, carries out described first step and described second step under the state of opening described liquid side stop valve.
The 4th invention is in any invention in first to the 3rd invention, reclaims the third step of the cold-producing medium in described heat source side loop after described second step finishes.
The 5th invention is in the 4th invention, Yi Bian in described third step, little by little open described gaseous state side stop valve, Yi Bian reclaim the cold-producing medium in described heat source side loop from gaseous state side valve mouth.
The 6th invention, be in the 4th invention, in described third step, carry out the work of reclaiming the cold-producing medium in this heat source side loop from heat source side valve port in the loop upper shed of described heat source side, with little by little open on one side described gaseous state side stop valve, on one side reclaim the cold-producing medium in this heat source side loop from gaseous state side valve mouth work.
-effect-
In first invention, carry out the first step and second step successively.Under normal conditions, before first step, it is more than the amount of liquid refrigerant that is present in the gaseous state side connecting pipe to be present in the amount of liquid refrigerant of utilizing in side loop and the liquid side connecting pipe.In this state, when first step, from at least with gaseous state side connecting pipe, the gaseous state side valve mouth one sucking-off cold-producing medium that utilizes side loop and liquid side connecting pipe to be communicated with, just flow in the gaseous state side connecting pipe from the cold-producing medium that utilizes side loop and liquid side connecting pipe.Therefore, be attached to refrigerator oil on the gaseous state side connecting pipe because the flowing and strip off of cold-producing medium.Refrigerator oil after the strip off is recovered from gaseous state side valve mouth with cold-producing medium.
After first step finished, refrigerant loop was in cold-producing medium and residues in liquid side connecting pipe in the refrigerant loop, utilizes the state in side loop and the gaseous state side connecting pipe.In this state, when second step, from least with liquid side connecting pipe, the liquid side valve mouth one sucking-off cold-producing medium that utilizes side loop and gaseous state side connecting pipe to be communicated with, just flow in the liquid side connecting pipe from the cold-producing medium of gaseous state side connecting pipe one side.Therefore, be attached to refrigerator oil on the liquid side connecting pipe because the flowing and strip off of cold-producing medium.Refrigerator oil after the strip off is recovered from liquid side valve mouth with cold-producing medium.Remark additionally, when second step, because make gaseous state side stop valve be in closed condition, so cold-producing medium and refrigerator oil can not flow into the gaseous state side connecting pipe from the heat source side loop.
When this first step and second step, concerning each bar connecting pipe, the flow velocity of cold-producing medium in own under the situation that is sucked out cold-producing medium from own that nearer side valve mouth be greater than the flow velocity of cold-producing medium in own under the situation that is sucked out cold-producing medium from oneself that side valve mouth far away, because the energy loss under the situation that is sucked out cold-producing medium from oneself that nearer side valve mouth is smaller.Therefore, the cold-producing medium that is attached on the gaseous state side connecting pipe is shelled often when from the first step of gaseous state side valve mouth sucking-off cold-producing medium, and the cold-producing medium that is attached on the liquid side connecting pipe is shelled often when from second step of liquid side valve mouth sucking-off cold-producing medium.In this first invention, by in first step and second step from different valve port sucking-off cold-producing mediums, come in each bar connecting pipe, to peel many refrigerator oils off respectively.
In second invention, when first step, closing under the state of gaseous state side stop valve from gaseous state side valve mouth sucking-off cold-producing medium.Therefore, the cold-producing medium in heat source side loop can not flow through gaseous state side stop valve and is sucked out from gaseous state side valve mouth.
The 3rd the invention first step in, gaseous state side valve mouth becomes following state, that is: not only with gaseous state side connecting pipe, utilize side loop and liquid side connecting pipe to be communicated with, and by liquid side stop valve also with the heat source side circuit communication.When first step, under this state from gaseous state side valve mouth sucking-off cold-producing medium.Therefore, when first step, because the cold-producing medium in heat source side loop flows through liquid side stop valve and flow into and utilize unit one side, so compare with the situation of carrying out first step under the state of closing liquid side stop valve, the refrigerant amount that utilizes unit one side that flows through when the first step and second step between gaseous state side valve mouth and the liquid side valve mouth is more.
In the 4th invention, when the third step after second step, reclaim the cold-producing medium in heat source side loop.Therefore, behind the recovery method that carries out this refrigerator oil, residue in the heat source side loop refrigerant amount seldom.
In the 5th invention, one side when third step, carry out little by little opening gaseous state side stop valve, Yi Bian reclaim the work of the cold-producing medium in heat source side loop from gaseous state side valve mouth.At this, before the beginning third step, occur the anxiety of following situation, that is: the both sides that will clip gaseous state side stop valve by comparison, the pressure of pressure ratio heat source side loop one side of gaseous state side connecting pipe one side that has reclaimed cold-producing medium and refrigerator oil in the first step and second step is low.If open gaseous state side stop valve sharp in this case, the cold-producing medium in heat source side loop and refrigerator oil will flow in the gaseous state side connecting pipe.In the 5th invention, Yi Bian by little by little opening gaseous state side stop valve, Yi Bian reclaim cold-producing medium, the cold-producing medium and the refrigerator oil that suppress the heat source side loop flow in the gaseous state side connecting pipe.
In the 6th invention, reclaim the cold-producing medium in heat source side loop from heat source side valve port and gaseous state side valve mouth.Therefore, behind the recovery method that carries out this refrigerator oil, residue in the heat source side loop refrigerant amount still less.In addition, the same with described the 5th invention, by little by little opening gaseous state side stop valve on one side, Yi Bian carry out reclaiming from gaseous state side valve mouth the work of the cold-producing medium in heat source side loop, the cold-producing medium and the refrigerator oil that suppress the heat source side loop flow in the gaseous state side connecting pipe.
The effect of-invention-
In the present invention, when first step,, mainly make the refrigerator oil strip off that is attached on the gaseous state side connecting pipe from gaseous state side valve mouth sucking-off cold-producing medium; When second step,, mainly make the refrigerator oil strip off that is attached on the liquid side connecting pipe from liquid side valve mouth sucking-off cold-producing medium.In other words, though under the situation of any the valve port sucking-off ownership cryogen from valve port, be difficult to reclaim the refrigerator oil of the connecting pipe that is positioned at a side opposite with the valve port of sucking-off, but because carry out in the present invention from the first step of gaseous state side valve mouth sucking-off cold-producing medium with from second step of liquid side valve mouth sucking-off cold-producing medium, so can from each bar connecting pipe, reclaim many cold-producing mediums.In addition, according to the existing method of carrying out cold-producing medium filling work for the yield that increases refrigerator oil, need carry out the work more than three times at least, and the method according to this invention, can be by the refrigerator oil of first step and this twice efficient work ground recovery gaseous state side connecting pipe of second step and liquid side connecting pipe.And, because do not fill cold-producing medium,, thereby can shorten in order to reclaim the required time of cold-producing medium so the cold-producing medium that will reclaim is seldom.Therefore, according to the present invention, can reclaim refrigerator oil efficiently, and alleviate to reclaiming required labour.
In addition, in second invention,, make the cold-producing medium in heat source side loop not flow through gaseous state side stop valve and be sucked out from gaseous state side valve mouth by making gaseous state side stop valve be in closed condition when the first step.Therefore, compare with the situation of carrying out first step under the state of opening gaseous state side stop valve, the flow velocity of cold-producing medium in gaseous state side connecting pipe is higher, thereby strip off and the refrigerator oil mass that is recovered is more on the gaseous state side connecting pipe.
In addition, in the 3rd invention,, the refrigerant amount that utilizes unit one side that flows through when the first step and second step between gaseous state side valve mouth and the liquid side valve mouth is increased by under the state of opening liquid side stop valve, carrying out first step.In other words, circulate in the total amount increase of the cold-producing medium of gaseous state side connecting pipe and liquid side connecting pipe.Therefore, can make the strip off and reclaim the refrigerator oil of this strip off on gaseous state side connecting pipe and the liquid side connecting pipe of more refrigerator oil.
In addition, in the 4th invention, the third step of the cold-producing medium by reclaiming the heat source side loop makes the cold-producing medium that residues in behind the recovery method that carries out this refrigerator oil in the heat source side loop seldom.Therefore, under the situation of changing heat source unit, can omit or alleviate in order from the thermal source unit that unloads, to reclaim the required burden of cold-producing medium.In addition, under the situation of the cold-producing medium of changing refrigerant loop, can improve the reliability of refrigerating plant.
In addition, in the 5th invention, by little by little opening gaseous state side stop valve when the third step on one side, carry out reclaiming the work of the cold-producing medium in heat source side loop on one side, the cold-producing medium in heat source side loop and refrigerator oil are not flow in the gaseous state side connecting pipe that has been recovered cold-producing medium and refrigerator oil from gaseous state side valve mouth.Therefore, can avoid refrigerant loop behind third step, to become the state that need from gaseous state side connecting pipe, reclaim cold-producing medium or refrigerator oil.
In addition, according to the 6th invention, by reclaiming the cold-producing medium in heat source side loop from heat source side valve port and gaseous state side valve mouth, make the cold-producing medium that behind the recovery method that carries out this refrigerator oil, residues in the heat source side loop still less.Therefore, under the situation of changing the thermal source unit, can omit in order from the thermal source unit that has unloaded, to reclaim the required burden of cold-producing medium or further to alleviate this burden.In addition, under the situation of the cold-producing medium of changing refrigerant loop, can further improve the reliability of refrigerating plant.In addition, the same with described the 5th invention, by little by little opening gaseous state side stop valve on one side, carry out reclaiming the work of the cold-producing medium in heat source side loop on one side, just can avoid refrigerant loop behind third step, to become the state that need from gaseous state side connecting pipe, reclaim cold-producing medium or refrigerator oil from gaseous state side valve mouth.
Description of drawings
Fig. 1 is the summary construction diagram of the related refrigerating plant of embodiments of the present invention.
Fig. 2 is the summary construction diagram of refrigerating plant when first step in the embodiment.
Fig. 3 is the summary construction diagram of refrigerating plant when second step in the embodiment.
Symbol description
9-heat source side valve port; The 10-refrigerating plant; The outdoor unit of 11-(thermal source unit); 13-indoor units (utilizing unit); The 20-refrigerant loop; The outdoor loop of 21-(heat source side loop); The indoor loop of 22-(utilizing side loop); The liquid side connecting pipe of 23-; 24-gaseous state side connecting pipe; The liquid side stop valve of 25-; 26-gaseous state side stop valve; The liquid side maintenance of 27-valve port (service port) (liquid side valve mouth); 28-gaseous state side maintenance valve port (gaseous state side valve mouth).
The specific embodiment
Embodiments of the present invention are illustrated.Remark additionally, below at first to the recovery method that adopts refrigerator oil involved in the present invention, be illustrated as the aircondition of refrigerating plant, then the recovery method to refrigerator oil involved in the present invention is illustrated.
The structure of-refrigerating plant-
Fig. 1 is the summary construction diagram of the related refrigerating plant of present embodiment 10.This refrigerating plant 10 is to comprise as the outdoor unit 11 of thermal source unit with as the aircondition that utilizes the indoor units 13 of unit, constitutes and switches and carry out cooling operation and warming operation.Remark additionally, the quantity of indoor units 13 is not limited to 1, also can adopt a plurality of indoor units 13.
In outdoor unit 11, be provided with outdoor loop 21 as the heat source side loop.In indoor units 13, be provided with as the indoor loop 22 that utilizes side loop.In this refrigerating plant 10, by with liquid side connecting pipe 23 and gaseous state side connecting pipe 24 outdoor loop 21 is connected, constitutes the refrigerant loop 20 that carries out the steam compression type refrigerating circulation with indoor loop 22.
＜outdoor unit 〉
In the outdoor loop 21 of outdoor unit 11, be provided with compressor 30, four-way change-over valve 33, outdoor heat converter 34, expansion valve 36, container 39 and liquid/gas separator (accumulator) 35.End in outdoor loop 21 is provided with the liquid side stop valve 25 that connects liquid side connecting pipe 23.The other end in outdoor loop 21 is provided with the gaseous state side stop valve 26 that connects gaseous state side connecting pipe 24.
In liquid side stop valve 25, be provided with liquid side maintenance valve port 27.Liquid side maintenance with valve port 27 in liquid side stop valve 25 than the closed position also near the position upper shed of liquid side connecting pipe 23 1 sides.
On the other hand, in gaseous state side stop valve 26, be provided with gaseous state side maintenance valve port 28.Gaseous state side maintenance with valve port 28 in gaseous state side stop valve 26 than the closed position also near the position upper shed of gaseous state side connecting pipe 24 1 sides.These valve ports the 27, the 28th when cold-producing medium in reclaiming refrigerant loop 20 and refrigerator oil and use when refrigerant loop 20 filling cold-producing mediums, and are being closed when cooling operation and warming operation.
In connecting pipe 32, be provided with heat source side valve port 9 in 32 upper sheds of this connecting pipe.Heat source side valve port 9 is to use when reclaiming the cold-producing medium in heat source side loop 21 in third step described later, is closing when cooling operation and warming operation.
In fluid pipeline 42, be disposed with container 39 and expansion valve 36 from outdoor heat converter 34 1 sides.Container 39 forms the airtight container shape, can temporarily accumulate in the high-pressure refrigerant of condensation in the outdoor heat converter 34.Expansion valve 36 constitutes the electric expansion valve that can change aperture.
In suction line 41, be provided with liquid/gas separator 35.Liquid/gas separator 35 forms the airtight container shape, and constitutes: isolate liquid refrigerant and this liquid refrigerant is accumulated in this liquid/gas separator 35 inside from the cold-producing medium that flows to compressor 30, in order to avoid compressor 30 sucks liquid refrigerant.
Four-way change-over valve 33 can switch following two states, that is: first state (state of representing with solid line in Fig. 1) and first valve port P1 that the first valve port P1 and the second valve port P2 interconnect and the 3rd valve port P3 and the 4th valve port P4 interconnect and the 4th valve port P4 interconnects and the second valve port P2 and the 3rd valve port P3 interconnect second state (state that dots in Fig. 1).
＜indoor units 〉
In the indoor loop 22 of indoor units 13, be provided with indoor heat converter 37.End in indoor loop 22 is provided with the liquid side flared fitting 38 that connects liquid side connecting pipe 23.The other end in indoor loop 22 is provided with the gaseous state side flared fitting 39 that connects gaseous state side connecting pipe 24.
The running action of-refrigerating plant-
Then, the running action to refrigerating plant 10 is illustrated.This refrigerating plant 10 can carry out cooling operation and warming operation by switching four-way change-over valve 33.
＜cooling operation 〉
When cooling operation, four-way change-over valve 33 is set at second state.Then, when running under this state during compressor 30, in refrigerant loop 20, carry out outdoor heat converter 34 and become the steam compression type refrigerating circulation that condenser and indoor heat converter 37 become evaporimeter.Remark additionally, when cooling operation, the aperture of expansion valve 36 is suitably regulated.
Particularly, the cold-producing medium that gushes out from compressor 30 carries out heat exchange and condensation with outdoor air outdoor heat converter 34.Condensed cold-producing medium reduces pressure when flowing through expansion valve 36 in outdoor heat converter 34, carries out heat exchange with room air afterwards in indoor heat converter 37 and evaporates.Cold-producing medium in indoor heat converter 37 after the evaporation is inhaled in the compressor 30 and is compressed.
＜warming operation 〉
When warming operation, four-way change-over valve 33 is set to first state.Then, when running under this state during compressor 30, in refrigerant loop 20, carry out outdoor heat converter 34 and become the steam compression type refrigerating circulation that evaporimeter and indoor heat converter 37 become condenser.Remark additionally, when warming operation, the aperture of expansion valve 36 is also suitably regulated.
Particularly, the cold-producing medium that gushes out from compressor 30 carries out heat exchange and carries out condensation with room air indoor heat converter 37.Condensed cold-producing medium reduces pressure when flowing through expansion valve 36 in indoor heat converter 37, carries out heat exchange with outdoor air afterwards in outdoor heat converter 34 and evaporates.Cold-producing medium in outdoor heat converter 34 after the evaporation is inhaled in the compressor 30 and is compressed.
The recovery method of-refrigerator oil-
Then, the method that is used for reclaiming refrigerator oil from the gaseous state side connecting pipe 24 of refrigerating plant 10 and liquid side connecting pipe 23 is illustrated.When outdoor unit 11 and indoor units 13 are replaced by new unit, still use the situation of former gaseous state side connecting pipe 24 and former liquid side connecting pipe 23 or changing the recovery method that utilizes this refrigerator oil under the situation of cold-producing medium of refrigerant loop 20.In the recovery method of this refrigerator oil, carry out first step, second step and third step successively.Below, various steps are illustrated.
＜first step 〉
In first step, make gaseous state side stop valve 26 become closed condition, and make liquid side stop valve 25 become open mode.Because four-way change-over valve 33 and expansion valve 36 to outdoor loop 21 are not regulated especially, so this four-way change-over valve 33 and expansion valve 36 are in the same state of state when finishing with the running of refrigerating plant 10.Under this state, the maintenance of gaseous state side is communicated with gaseous state side connecting pipe 24, indoor loop 22 and liquid side connecting pipe 23 with valve port 28, also is communicated with outdoor loop 21 by liquid side stop valve 25.
As shown in Figure 2, refrigerant recoverer 45 is connected the maintenance of gaseous state side with on the valve port 28.Remark additionally, refrigerant recoverer 45 is the devices that comprise vavuum pump and returnable.Refrigerant recoverer 45 constitutes and can will be accommodated in the returnable with the cold-producing medium that vavuum pump attracts.After refrigerant recoverer 45 being connected on the gaseous state side maintenance usefulness valve port 28, make the vavuum pump running of refrigerant recoverer 45.
Under normal conditions, before making the vavuum pump running, the amount of liquid refrigerant that is present in indoor loop 22 and the liquid side connecting pipe 23 is more than the amount of liquid refrigerant that is present in the gaseous state side connecting pipe 24.If make vavuum pump running under this state, the cold-producing medium of the part that is communicated with valve port 28 with the maintenance of gaseous state side in the refrigerant loop 20 just keeps in repair to the gaseous state side and moves with valve port 28.Afterwards, along with the running of vavuum pump, the cold-producing medium of indoor loop 22 and liquid side connecting pipe 23 is keeping previous status or is becoming the gas-liquid two-phase state flowing in the gaseous state side connecting pipe 24.Therefore, be attached to the refrigerator oil on the gaseous state side connecting pipe 24, perhaps be dissolved in the liquid refrigerant (being in the cold-producing medium of gas-liquid two-phase state), perhaps owing to flowing of cold-producing medium is flushed away, thereby by strip off.Refrigerator oil after the strip off is recovered with valve port 28 from the maintenance of gaseous state side with cold-producing medium.The running of the vavuum pump in the first step is continued the stipulated time (for example one minute).The time of the ownership cryogen that does not reclaim in the refrigerant loop 20 part that is communicated with valve port 28 with the maintenance of gaseous state side will be set at duration of runs of vavuum pump.After first step just finished, cold-producing medium became the state in liquid side connecting pipe 23, indoor loop 22 and the gaseous state side connecting pipe 24 that residues in refrigerant loop 20.
＜the second step 〉
In second step, the same with described first step, make gaseous state side stop valve 26 become closed condition, and make liquid side stop valve 25 become open mode.Under this state, liquid side maintenance all is communicated with the both sides of valve port 27 with the closed position of stop valve 25.In other words, liquid side maintenance is communicated with liquid side connecting pipe 23, indoor loop 22 and gaseous state side connecting pipe 24 with valve port 27, also is communicated with outdoor loop 21.As shown in Figure 3, will be connected liquid side maintenance from the refrigerant recoverer 45 that the maintenance of gaseous state side is unloaded down with valve port 28, make the vavuum pump running of refrigerant recoverer 45 again with on the valve port 27.
One makes vavuum pump running, and the cold-producing medium of the part that is communicated with valve port 27 with liquid side maintenance in the refrigerant loop 20 just keeps in repair to liquid side and moves with valve port 27.Then, along with the running of vavuum pump, the liquid side cold-producing medium (being in the cold-producing medium of gas-liquid two-phase state) of indoor loop 22 and gaseous state side connecting pipe 24 flow in the liquid side connecting pipe 23.Therefore, be attached to the refrigerator oil on the liquid side connecting pipe 23, perhaps be dissolved in the liquid refrigerant (being in the cold-producing medium of gas-liquid two-phase state), perhaps owing to flowing of cold-producing medium is flushed away, thereby by strip off.Refrigerator oil after the strip off is recovered with valve port 27 from liquid side maintenance with cold-producing medium.In second step, the running of vavuum pump lasted till till the pressure that liquid side maintenance is measured on valve port 27 becomes value below first force value of regulation, to reclaim most of cold-producing medium than the position of gaseous state side stop valve 26 and liquid side stop valve 25 also close indoor units 13 1 sides.
＜third step 〉
In third step, carry out first work and second work.When first work, make gaseous state side stop valve 26 become closed condition, and make liquid side stop valve 25 become open mode, the same with described first step and described second step.Then, will be connected on the heat source side valve port 9, make the vavuum pump running of refrigerant recoverer 45 again from the refrigerant recoverer 45 that liquid side maintenance is unloaded down with valve port 27.One makes the vavuum pump running, and the cold-producing medium in outdoor loop 21 just is recovered.In first work, the running of vavuum pump lasted till till the pressure of measuring on the heat source side valve port 9 becomes less than the value below second force value of the regulation of first force value.
At this, because if only carry out first work, just occur the anxiety of following situation, so also carry out second work, described situation is: the cold-producing medium that does not reclaim ratio piston compressor 30 also close gaseous state side stop valve 26 1 sides in the outdoor loop 21, in other words, under being in the situation of first state, do not reclaim four-way change-over valve 33 at the ejiction opening of compressor 30 and the cold-producing medium between the gaseous state side stop valve 26; Be at four-way change-over valve 33 under the situation of second state and do not reclaim at the suction inlet of compressor 30 and the cold-producing medium between the gaseous state side stop valve 26.In second work, will be connected the maintenance of gaseous state side from the refrigerant recoverer 45 that heat source side valve port 9 is unloaded down with on the valve port 28.Then, from the state that gaseous state side stop valve 26 is being closed and liquid side stop valve 25 is being opened, Yi Bian little by little open gaseous state side stop valve 26, Yi Bian make the vavuum pump running.One makes the vavuum pump running, and the cold-producing medium that residues in the outdoor loop 21 after first work just is recovered.In second work, the running of vavuum pump lasted till in the maintenance of gaseous state side till the pressure of measurement becomes less than the value below the 3rd force value of the regulation of second force value on valve port 28.Like this, most of cold-producing medium in outdoor loop 21 just is recovered.
Remarking additionally, little by little opening gaseous state side stop valve 26 and carrying out second work, is in the cold-producing medium and refrigerator oil inflow gaseous state side connecting pipe 24 in outdoor loop 21.In other words, after first work, occur the anxiety of following situation, that is: the both sides that will clip gaseous state side stop valve 26 by comparison, the pressure of gaseous state side connecting pipe 24 1 sides is lower than the pressure of outdoor loop 21 1 sides.In this case, if open gaseous state side stop valve 26 sharp, the cold-producing medium in outdoor loop 21 and refrigerator oil will flow in the gaseous state side connecting pipe 24 that has reclaimed cold-producing medium and refrigerator oil of having required great effort.Therefore, Yi Bian little by little open gaseous state side stop valve 26, Yi Bian carry out second work.
In the present embodiment, when the first step and second step, concerning each bar connecting pipe 23,24, the flow velocity of cold-producing medium in own under the situation that is sucked out cold-producing medium from own that nearer side valve mouth 27,28 be greater than the flow velocity of cold-producing medium in own under the situation that is sucked out cold-producing medium from oneself that side valve mouth 27,28 far away, because the energy loss under the situation that is sucked out cold-producing medium from oneself that nearer side valve mouth 27,28 is smaller.Therefore, be attached to cold-producing medium on the gaseous state side connecting pipe 24 when shelling often during with the first step of valve port 28 sucking-off cold-producing mediums, and the cold-producing medium that is attached on the liquid side connecting pipe 23 is shelled often when second step of keeping in repair from liquid side with valve port 27 sucking-off cold-producing mediums from gaseous state side maintenance.In this embodiment, by in first step and second step from different valve ports 27,28 sucking-off cold-producing mediums, come in each bar connecting pipe 27,28, to peel many refrigerator oils off respectively.
In addition, in the present embodiment, because when first step, make gaseous state side stop valve 26 be in closed condition, so the cold-producing medium in outdoor loop 21 can not flow through gaseous state side stop valve 26 and be sucked out with valve port 28 from the maintenance of gaseous state side.In addition, because when first step, make liquid side stop valve 25 be in open mode,, the cold-producing medium in outdoor loop 21 flows into indoor units 13 1 sides so flowing through liquid side stop valve 25.Therefore, with the situation of carrying out first step under liquid side stop valve 25 closing state is compared, it is more with the refrigerant amount of indoor units 13 1 sides between valve port 28 and the liquid side maintenance usefulness valve port 27 to flow through gaseous state side maintenance when the first step and second step.
The effect of-embodiment-
In the present embodiment, when first step, keep in repair with valve port 28 sucking-off cold-producing mediums from the gaseous state side, next main strip off is attached to the refrigerator oil on the gaseous state side connecting pipe 24, from liquid side maintenance valve port 27 sucking-off cold-producing mediums, next main strip off is attached to the refrigerator oil on the liquid side connecting pipe 23 when second step.In other words, though under the situation of any valve port 27, the 28 sucking-off ownership cryogen from valve port 27,28, be difficult to reclaim the refrigerator oil of the connecting pipe 23,24 that is positioned at a side opposite with the valve port 27,28 of sucking-off, but because carry out in the present invention from the maintenance of gaseous state side with the first step of valve port 28 sucking-off cold-producing mediums with from second step of liquid side maintenance, so can from each bar connecting pipe 23,24, reclaim many refrigerator oils with valve port 27 sucking-off cold-producing mediums.In addition, according to the existing method of carrying out cold-producing medium filling work for the yield that increases refrigerator oil, need carry out the work more than three times at least, and the method according to this invention, can be by the refrigerator oil of first step and this twice efficient work ground recovery gaseous state side connecting pipe 24 of second step and liquid side connecting pipe 23.And, because do not fill cold-producing medium,, thereby can shorten in order to reclaim the required time of cold-producing medium so the refrigerant amount that will reclaim is very little.Therefore, according to the present invention, can reclaim refrigerator oil efficiently, and alleviate to reclaiming required labour.
Remark additionally, do not need in the present embodiment to carry out the cold-producing medium of refrigerant loop 20 is collected finding time in the outdoor loop 21.In addition, because do not find time, so even under the situation that compressor 30 is out of order, can reclaim the work of refrigerator oil yet.
In addition, in the present embodiment, when first step, be in closed condition, avoid the cold-producing medium in outdoor loop 21 to flow through gaseous state side stop valve 26 and be sucked out with valve port 28 from the maintenance of gaseous state side by making gaseous state side stop valve 26.Therefore, compare with the situation of carrying out first step under the state of opening gaseous state side stop valve 26, the flow velocity of cold-producing medium in gaseous state side connecting pipe 24 is higher, thereby strip off and the refrigerator oil mass that is recovered is bigger on the gaseous state side connecting pipe 24.
In addition, in the present embodiment, because under the state of opening liquid side stop valve 25, carry out first step, so, liquid refrigerants in the container 39 will occur lodging in and flow into situation in the liquid side connecting pipe 23 if expansion valve 36 is being opened.Like this, flowing through gaseous state side maintenance when the first step and second step will be more with the refrigerant amount of indoor units 13 1 sides between valve port 28 and the liquid side maintenance usefulness valve port 27.In other words, it is more to circulate in the total amount of the cold-producing medium in gaseous state side connecting pipe 24 and the liquid side connecting pipe 23.Therefore, can be from the more refrigerator oil of strip off on gaseous state side connecting pipe 24 and the liquid side connecting pipe 23 and the refrigerator oil after reclaiming this strip off.
In addition, in the present embodiment, the third step of the cold-producing medium by reclaiming outdoor loop 21, make behind the recovery method that carries out this refrigerator oil, residue in the cold-producing medium in the outdoor loop 21 amount seldom.Particularly in the present embodiment, by carrying out reclaiming first work of cold-producing medium in outdoor loop 21 and second work of reclaiming the cold-producing medium in outdoor loop 21 with valve port 28 when the third step, just can positively reclaim the cold-producing medium in outdoor loop 21 from the maintenance of gaseous state side from heat source side valve port 9.Therefore, under the situation of changing outdoor unit 11, can omit the work of from the outdoor unit of unloading down 11, reclaiming cold-producing medium.In addition, under the situation of the cold-producing medium of changing refrigerant loop 20, can improve the reliability of refrigerating plant 10.
In addition, in the present embodiment, by little by little opening gaseous state side stop valve 26 when the third step on one side, carry out on one side avoiding the cold-producing medium in outdoor loop 21 and refrigerator oil inflow to reclaim in the gaseous state side connecting pipe 24 of cold-producing medium and refrigerator oil from the work of gaseous state side maintenance with the cold-producing medium in the outdoor loop 21 of valve port 28 recovery.Therefore, can avoid refrigerant loop 20 and behind third step, become the state that need from gaseous state side connecting pipe 24, reclaim cold-producing medium or refrigerator oil.
The variation of-embodiment-
Variation to embodiment is illustrated.This variation is to adopt recovery method under the situation of the refrigerating plant 10 that heat source side valve port 9 is not set, refrigerator oil.In this variation, carry out the first step and second step with described embodiment the samely, and when third step, only carry out second work.When second work, will be connected the maintenance of gaseous state side from the refrigerant recoverer 45 that liquid side maintenance is unloaded down with valve port 27 with on the valve port 28.Then, from closing gaseous state side stop valve 26 and open the state of liquid side stop valve 25, Yi Bian little by little open gaseous state side stop valve 26, Yi Bian make the vavuum pump running.
＜other embodiments 〉
Also described embodiment can be made as following structure.
In said embodiment, when first step, make the vavuum pump running stipulated time.Also can make vavuum pump running, till the pressure of measurement becomes value below the force value of regulation on valve port 28 in the maintenance of gaseous state side.
In addition, in said embodiment, also can under the state of closing liquid side stop valve 25, carry out first step.Equally, also can under the state of closing liquid side stop valve 25, carry out second step.
In addition, in said embodiment, also can under the state of opening gaseous state side stop valve 26, carry out first step.
In addition, in said embodiment, also can in third step, carry out first work and second work simultaneously.Particularly, not the refrigerant recoverer 45 of same object to heat source side valve port 9 and the maintenance of gaseous state side with valve port 28 connections respectively.Then, from closing gaseous state side stop valve 26 and open the state of liquid side stop valve 25, Yi Bian little by little open gaseous state side stop valve 26, Yi Bian make the vavuum pump running of both sides' refrigerant recoverer 45.In addition, also can after carrying out second work, carry out first work.
In addition, in said embodiment, also can make expansion valve 36 become open mode at first forcibly, carry out first step then.In this case, compare with the situation of carrying out first step under the state of closing expansion valve 36, it is more with the refrigerant amount of indoor units 13 1 sides between the valve port 27 with valve port 28 and the maintenance of liquid side to flow through the maintenance of gaseous state side when the first step and second step.
Remark additionally, above-mentioned embodiment is suitable examples basically, not to the present invention, the intention that adopts the scope of object of the present invention or its purposes to be limited.
-industrial applicibility-
As mentioned above, the present invention to the recovery method of following refrigerator oil of great use, the recovery method of this refrigerator oil is: in the refrigerating plant that comprises the thermal source unit and utilize unit to couple together by gaseous state side connecting pipe and liquid side connecting pipe the refrigerant loop that consists of, reclaim recovery method refrigerator oil, refrigerator oil from this gaseous state side connecting pipe and this liquid state side connecting pipe.
Claims (6)
1. the recovery method of a refrigerator oil, with the heat source side loop (21) in the thermal source unit (11) and utilize and utilize side loop (22) to connect the refrigerant loop (20) that constitutes to carry out in the refrigerating plant (10) of kind of refrigeration cycle in the unit (13) by gaseous state side connecting pipe (24) and liquid side connecting pipe (23), from this gaseous state side connecting pipe (24) and this liquid state side connecting pipe (23), reclaim refrigerator oil, it is characterized in that:
In the recovery method of described refrigerator oil, carry out the first step and second step successively, in this first step, reclaim the neutralize part of cold-producing medium of the part that this gaseous state side valve mouth (28) is communicated with of refrigerator oil and described refrigerant loop (20) together from gaseous state side valve mouth (28), this gaseous state side valve mouth (28) in the gaseous state side stop valve (26) of an end that is arranged at described heat source side loop (21) than the closed position also near the position upper shed of gaseous state side connecting pipe (24) one sides; In this second step, under the state of closing described gaseous state side stop valve (26), reclaim a neutralize part or the integral body of cold-producing medium of the part that this liquid state side valve mouth (27) is communicated with of refrigerator oil and described refrigerant loop (20) together from liquid side valve mouth (27), this liquid state side valve mouth (27) in the liquid side stop valve (25) of the other end that is arranged at described heat source side loop (21) than the closed position also near the position upper shed of liquid side connecting pipe (23) one sides.
2. the recovery method of refrigerator oil according to claim 1 is characterized in that:
Under the state of closing described gaseous state side stop valve (26), carry out described first step.
3. the recovery method of refrigerator oil according to claim 1 and 2 is characterized in that:
Under the state of opening described liquid side stop valve (25), carry out described first step and described second step.
4. the recovery method of refrigerator oil according to claim 1 is characterized in that:
After finishing, described second step reclaims the third step of the cold-producing medium in described heat source side loop (21).
5. the recovery method of refrigerator oil according to claim 4 is characterized in that:
In described third step, Yi Bian little by little open described gaseous state side stop valve (26), Yi Bian reclaim the cold-producing medium in described heat source side loop (21) from gaseous state side valve mouth (28).
6. the recovery method of refrigerator oil according to claim 4 is characterized in that:
In described third step, carry out from reclaim the work of the cold-producing medium in this heat source side loop (21) at the heat source side valve port (9) of described heat source side loop (21) upper shed, with little by little open on one side described gaseous state side stop valve (26), on one side reclaim the cold-producing medium in this heat source side loop (21) from gaseous state side valve mouth (28) work.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP046343/2006 | 2006-02-23 | ||
| JP2006046343A JP3956997B1 (en) | 2006-02-23 | 2006-02-23 | Refrigerating machine oil recovery method |
| PCT/JP2007/053061 WO2007105425A1 (en) | 2006-02-23 | 2007-02-20 | Method of recovering refrigerator oil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101379351A CN101379351A (en) | 2009-03-04 |
| CN101379351B true CN101379351B (en) | 2011-07-20 |
Family
ID=38456439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007800044629A Expired - Fee Related CN101379351B (en) | 2006-02-23 | 2007-02-20 | Method of recovering refrigerator oil |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1992893A4 (en) |
| JP (1) | JP3956997B1 (en) |
| CN (1) | CN101379351B (en) |
| AU (1) | AU2007225990B2 (en) |
| WO (1) | WO2007105425A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2685181B1 (en) * | 2011-03-07 | 2020-05-20 | Mitsubishi Electric Corporation | Air conditioner |
| WO2017199345A1 (en) * | 2016-05-17 | 2017-11-23 | 三菱電機株式会社 | Air conditioner |
| JP7107964B2 (en) * | 2017-11-30 | 2022-07-27 | 三菱電機株式会社 | refrigeration cycle equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3050824B2 (en) * | 1997-01-08 | 2000-06-12 | 仁吉 合澤 | Method for recovering refrigerant in heat exchanger and method for resupplying refrigerant |
| JP2000249433A (en) * | 1999-03-02 | 2000-09-14 | Daikin Ind Ltd | Air conditioner and method for refrigerant recovery |
| JP2003194437A (en) * | 2001-12-25 | 2003-07-09 | Daikin Ind Ltd | Bottom oil recovery method |
| JP4061494B2 (en) * | 2003-03-27 | 2008-03-19 | 三菱電機株式会社 | Connection pipe cleaning method, refrigerating device renewal method, and freezing device |
| JP2005037020A (en) * | 2003-07-18 | 2005-02-10 | Hitachi Ltd | Heat accumulation type air conditioner |
-
2006
- 2006-02-23 JP JP2006046343A patent/JP3956997B1/en active Active
-
2007
- 2007-02-20 EP EP07714564A patent/EP1992893A4/en not_active Withdrawn
- 2007-02-20 WO PCT/JP2007/053061 patent/WO2007105425A1/en active Application Filing
- 2007-02-20 AU AU2007225990A patent/AU2007225990B2/en not_active Ceased
- 2007-02-20 CN CN2007800044629A patent/CN101379351B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| AU2007225990A1 (en) | 2007-09-20 |
| EP1992893A1 (en) | 2008-11-19 |
| JP3956997B1 (en) | 2007-08-08 |
| WO2007105425A1 (en) | 2007-09-20 |
| EP1992893A4 (en) | 2011-06-01 |
| AU2007225990B2 (en) | 2010-02-11 |
| JP2007225184A (en) | 2007-09-06 |
| CN101379351A (en) | 2009-03-04 |
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