CN100387907C - Air conditioning apparatus - Google Patents
Air conditioning apparatus Download PDFInfo
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- CN100387907C CN100387907C CNB2004100312029A CN200410031202A CN100387907C CN 100387907 C CN100387907 C CN 100387907C CN B2004100312029 A CNB2004100312029 A CN B2004100312029A CN 200410031202 A CN200410031202 A CN 200410031202A CN 100387907 C CN100387907 C CN 100387907C
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- liquid
- hot gas
- compressor
- accumulating trough
- housing
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- 238000004378 air conditioning Methods 0.000 title 1
- 239000003507 refrigerant Substances 0.000 claims abstract description 72
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000005057 refrigeration Methods 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 13
- 230000008020 evaporation Effects 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 230000008676 import Effects 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000010687 lubricating oil Substances 0.000 claims 1
- 239000003921 oil Substances 0.000 description 54
- 238000001816 cooling Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000002156 mixing Methods 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000010696 ester oil Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000005417 food ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000010721 machine oil Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 235000013324 preserved food Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
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Abstract
This air conditioner has the accumulator arranged on the suction side of the compressor for constituting a refrigerating cycle, and introducing and guiding a separated gas refrigerant to the compressor by separating gas and liquid by introducing the refrigerant evaporated in a heat exchanger, and has a hot gas bypass circuit G for separating and introducing a part of hot gas delivered from the compressor to a bottom part of the accumulator, and an opening and closing valve arranged in this hot gas bypass circuit, and controlling opening and closing according to a preset condition.
Description
Technical field
The present invention relates to a kind of aircondition with liquid-accumulating trough of the suction side of being arranged on.
Background technology
Be arranged on liquid-accumulating trough in the kind of refrigeration cycle comprise housing, be connected housing top and with vaporized refrigerant import to ingress pipe in the housing, delivery line, the delivery line sweep of guiding the gaseous refrigerant of gas-liquid separation into compressor from housing upper, open end with the bend that roughly is the U font make the refrigerator oil that accumulates in housing bottom be back to spill port in the compressor.
Open in the flat 11-14201 communique spy as prior art, following technology is disclosed: except that the spill port of delivery line bottom, also on the open side tube wall of delivery line, be provided with at least one the auxiliary spill port that extends along the vertical direction, no matter whether liquid refrigerant is arranged, even divide at refrigerator oil and liquid refrigerant under two layers the situation, also can make oil turn back to compressor by auxiliary spill port.
Therefore, when under the very low situation of outside air temperature, carrying out heat supply running, when starting, the inner interim more cold-producing medium of preserving of liquid-accumulating trough.Under this condition, liquid refrigerant is not only from spill port, and is inhaled into from a plurality of auxiliary spill ports, and the liquid part that flows to compressor is increased, thereby can not be satisfactory on the reliability of compressor.
In addition, Rotary Compressor is owing to directly sucking discharge chambe with cold-producing medium, so danger is big especially.Because the recirculating oil quantity (aperture) that is arranged on the air-suction cover of compressor air suction portion stipulate, thus too much liquid refrigerant and oil accumulation are had in the air-suction cover, thereby exist because liquid state is compressed and oil pressure contracts and make the danger of compressor damage.
And aircondition uses the higher cold-producing mediums of working pressure such as R32 and R410A, therefore just must adopt thicker liquid-accumulating trough housing wall in withstand voltage design.Increase owing to the wall thickness that has increased housing makes cost, size is strengthened, displacement volume is then identical.
Even such liquid-accumulating trough is because spill port is arranged on the foot of ingress pipe sweep, so when two layers of the branches of generation refrigerator oil and liquid refrigerant, oil level makes oil can not be back to compressor in the liquid level top of liquid refrigerant.
Be trapped under the situation of liquid-accumulating trough bottom at liquid refrigerant and oil, because the official post oil return feature variation of case top.Particularly, oil viscosity is more high factor when low temperature, makes this tendency more obvious.
In order to improve this rough sledding, can consider to improve the oil return characteristic by inner with the outside pressure reduction of the delivery line of spill port by cold-producing medium flow velocity, increase that raising flows in the delivery line, but opposite, so just producing has increased the problem that the pressure loss and conversion (achievement) coefficient at the delivery line place reduce.
Summary of the invention
The present invention is exactly at the problems referred to above, therefore the purpose of this invention is to provide a kind of aircondition, even this device produces in liquid-accumulating trough under two layers of state that separates of liquid refrigerant and refrigerator oil, also can guarantee liquid refrigerant and oily mixing, and improve oil return efficient, thereby improved reliability to compressor.，
For the purpose that realizes addressing the above problem, aircondition of the present invention comprises the liquid-accumulating trough of the suction side that is arranged on the compressor that constitutes kind of refrigeration cycle, this liquid-accumulating trough separates the refrigerant air-liquid that enters after the evaporation in heat exchanger, and the gaseous refrigerant that guiding separates enters described compressor, it also comprises: the part of the hot gas that will discharge from described compressor is diverted to the hot gas bypass circulation the described liquid-accumulating trough, and an end of described hot gas bypass circulation is connected with the bottom of described liquid-accumulating trough; Be arranged in the described hot gas bypass circulation and the switch valve that carries out switch control according to service condition.
According to for to address this is that the means that adopted,, also can guarantee liquid refrigerant and oily mixing even the cold-producing medium in liquid-accumulating trough is given birth to two layers of state that separates with fry dried food ingredients.
Description of drawings
Fig. 1 is the system diagram according to the cold-producing medium circulation of the aircondition of the embodiment of the invention.
Fig. 2 is the cutaway view of the liquid-accumulating trough of identical embodiment;
Fig. 3 is the view of the inner different conditions of liquid-accumulating trough of the identical embodiment of expression;
Fig. 4 is the curve map of the admixture of interior cold-producing medium of identical embodiment, expression liquid-accumulating trough and refrigerator oil;
Fig. 5 is according to the cutaway view of the liquid-accumulating trough of another embodiment and cooling cycle system figure;
The controlling party block diagram that Fig. 6 controls according to another embodiment, to the switch valve of hot gas bypass circulation.
Fig. 7 is the controlling party block diagram according to the switch valve of the cooling cycle system figure of another embodiment and control hot gas bypass circulation;
Fig. 8 is the system diagram according to the kind of refrigeration cycle of another embodiment;
Fig. 9 is according to another embodiment, at the cooling cycle system figure of outdoor pusher side.
The specific embodiment
Below embodiments of the invention will be described with reference to the accompanying drawings.
Fig. 1 is the cooling cycle system figure of air-conditioner, and Fig. 2 is the cutaway view that expression is used in the liquid-accumulating trough structure in the kind of refrigeration cycle.
The interface of cross valve 2 one sides is connected with refrigerant pipe P, this refrigerant pipe P links to each other with the discharge portion of compressor 1, the interface of the opposite side of cross valve 2 is connected on the refrigerant pipe P, this pipe links to each other with outdoor heat converter 3, outdoor heat converter 3 links to each other with indoor heat converter 5 with electric expansion valve 4 as throttling arrangement more in turn, and indoor heat converter 5 is connected on the other interface of cross valve 2 again.
The refrigerant pipe that is connected on all the other interfaces of cross valve 2 is inserted in the liquid-accumulating trough 6 as the ingress pipe Pa of the primary side of liquid-accumulating trough 6 (back will be described).Liquid-accumulating trough 6 secondary sides link to each other with the air-suction cover of the air-breathing part that is arranged on compressor 1 as delivery line Pb.
Therefore, in aircondition, have heat pump type refrigerating agent closed circuit K, and the exhaust side refrigerant pipe P of compressor 1 links to each other with above-mentioned liquid-accumulating trough 6 by hot gas bypass circulation G described later.
An end that constitutes the bypass pipe 11 of above-mentioned hot gas bypass circulation G is connected on the compressor air-discharging side refrigerant pipe P, and the other end is connected the bottom of liquid-accumulating trough housing 10.
Above-mentioned liquid-accumulating trough 6 comprises the housing 10 of closed structure; Insert the ingress pipe Pa that its inside and openend are positioned at the housing upper position from the top of housing 10; Near the general curved that insert its inside from the top of housing 10, has close housing bottom is becoming the sweep b of U font and the delivery line Pb of the upper position that openend c is positioned at housing 10.
The fore-end of above-mentioned ingress pipe Pa and delivery line Pb may be selected to be and is in not mutual opposed position.Though the front opening of above-mentioned ingress pipe Pa part is by 16 shutoff of shutoff plate, can cold-producing medium be directed in the housing 10 by near the perforate 17 that is arranged on the front end.
In addition, be provided with spill port 18 on the sweep b of above-mentioned delivery line Pb in housing 10.The position of this spill port 18 is arranged on the foot of sweep c, not accumulate under the common running status of cold-producing medium, makes the hold-up minimum of oil.
As mentioned above, the bottom that constitutes the housing 10 of liquid-accumulating trough 6 is connected with the bypass pipe 11 that is made of the hot gas bypass circulation, is provided with above-mentioned switch valve 12 and capillary 13 on this bypass pipe 11.
In the aircondition that constitutes in a manner described, if select refrigerating operaton, it is mobile that then the high temperature and high pressure gaseous refrigerant of discharging from compressor 1 press the direction shown in the solid arrow the figure.Cold-producing medium evaporates in indoor heat converter 5, and absorbs heat of evaporation from room air, thus the cooling effect that realization dehumidifies and lowers the temperature air in empty.
If the selection heat supply running is then pressed the direction shown in the dotted arrow the figure from the high temperature and high pressure gaseous refrigerant of the discharge of compressor 1 and is flowed.Cold-producing medium is emitted condensation heat to room air in indoor heat converter 5, thereby realizes improving the heat supply effect of indoor air temperature.
No matter during in the cooling operation or at heat supply running, the cold-producing medium of evaporation produces the gas-liquid separation effect after entering in the liquid-accumulating trough housing 10 by ingress pipe Pa.The gaseous refrigerant that separates is inhaled into compressor 1 from delivery line Pb.The liquid refrigerant that separates is trapped in the bottom of housing 10, and As time goes on evaporation gasification gradually, is sucked by compressor then.
Fig. 3 (A) is illustrated in the state of liquid-accumulating trough 6 inside when starting heat supply running under the extremely low temperature conditions.
When carrying out heat supply running starting compressor 1, some cold-producing medium in the liquid refrigeration circulation is trapped in the liquid-accumulating trough at short notice morely.At this moment, have the oil component in the more kind of refrigeration cycle to discharge from compressor 1, this oil component is in liquid refrigerant is trapped in liquid-accumulating trough 6.
That is to say that because the relation of proportion, the downside that constitutes the housing 10 of liquid-accumulating trough 6 forms liquid refrigerant layer R, the top of this liquid refrigerant layer R is the layer L of refrigerator oil, so just forms so-called two layers of released state.
In this case, because flow differential pressure makes liquid refrigerant and refrigerator oil be inhaled into spill port 18, particularly when low temperature,, make oil return characteristic variation because liquid-accumulating trough 10 higher pressure head and refrigerator oil viscosities increase.
Fig. 3 (B) expression under these conditions, when being arranged on switch valve 12 among the above-mentioned hot gas bypass circulation G and being opened, the view of liquid-accumulating trough 6 internal states.
The switch valve 12 that is connected on the hot gas bypass circulation G of exhaust side of compressor 1 is opened, made the part of the hot gas of discharging from compressor 1 flow into liquid-accumulating troughs 6 by bypass pipe 11.
Hot gas in the inflow bypass pipe 11 is injected into enclosure interior from the bottom of liquid-accumulating trough housing 10 with the state that upwards blows.The hot gas disturbance effectively that liquid refrigerant layer R that forms in housing 10 and refrigerator oil reservoir L are injected into makes its rapid evaporation gasification, and flows into compressor 1 by delivery line Pb.
That is to say,, make the rapid discharge of liquid refrigerant in the housing 10 and reflux characteristic is improved, thereby guaranteed the reliability of compressor 1 by the by-pass flow in liquid-accumulating trough housing 10 of guiding hot gas.
Fig. 4 represents the oil/refrigerant concentration of the refrigerator oil that ester oil is and the gas-liquid separating characteristic of cold-producing medium/refrigerator oil.In addition, " insoluble " expression oil among the figure and liquid refrigerant be immiscible state fully, and " mixing " expression oil and liquid refrigerant are the roughly transparent state that mixes fully basically." outstanding turbid " expression oil is for the fused degree of liquid refrigerant, and not fused part is more, and is cloudy state owing to temperature height, oil bubble.
In some zone, the refrigerator oil in the liquid-accumulating trough 6 takes place two layers with liquid refrigerant to be separated, and refrigerator oil is positioned at the top of liquid refrigerant.Just can not absorption refrigerating machine oil when in this case, attracting whole liquid refrigerants.During attracting liquid refrigerant, refrigerator oil does not all turn back in the compressor, and just there is the danger that causes damage owing to the shortage of oil of compressor 1 in this.
Owing to have hot gas bypass circulation G, even two layers that refrigerator oil and liquid refrigerant take place in the liquid-accumulating trough 6 that has too much liquid to reflux are separated, but the perturbation action that utilizes hot gas can impel the liquid refrigerant evaporation, thereby the oil return that has improved compressor 1.
In addition, because a plurality of spill ports needn't be set as prior art, thus can and not increase back liquid measure in the recirculating oil quantity that increases compressor, thereby can not reduce the reliability of compressor.
Fig. 5 (A) is the structure chart of the liquid-accumulating trough 6A of another embodiment of expression.Fig. 5 (B) is the cooling cycle system figure that the air-conditioner of above-mentioned liquid-accumulating trough 6A is housed.
Because the not special change of refrigeration cycle K itself is so omitted here having the component representation of same reference numerals.The bypass pipe 11 that constitutes hot gas bypass circulation G is connected the side lower part of liquid-accumulating trough housing 10.
Above-mentioned liquid-accumulating trough 6A comprises housing 10, ingress pipe Pa, has the delivery line Pb of sweep b, opens the spill port 18 on the sweep b of this delivery line Pb.
Now more above-mentioned bypass pipe 11 is described at the link position of housing 10 and the position of spill port on the other side 18.Spill port 18 is arranged on bypass pipe 11 to be had on the positions of 180 degree with respect to the link position of housing 10
That is to say, as shown in the figure, if bypass pipe 11 is connected the bottom, left side of housing 10, then spill port 18 open delivery line Pb along on the right side part of the sweep b of left and right directions bending.
In addition, shown in chain-dotted line among the figure, if bypass pipe 11 is connected the rear side of housing 10, then spill port 18 is opened the side at the moment at sweep b.In a word, the connection height and position Ha of bypass pipe 11 selects the higher position of height H b than the sweep b inboard of delivery line Pb.
Utilize this structure, open the switch valve 12 of hot gas bypass circulation G, hot gas is directed to liquid-accumulating trough housing 10, hot gas is because buoyancy function flow to the place higher than the link position of bypass pipe 11.
Thus, the hot gas that flows out from bypass pipe 11 can directly not enter spill port 18 (short circuit), and like this, the liquid towards cold-producing medium carries out high efficiency disturbance just can avoid taking place two layers of separation.
In addition, be used in cold-producing medium in the kind of refrigeration cycle if the high-pressure refrigerant as R32 and R410A then must carry out withstand voltage design, the result has increased the wall thickness of the housing 10 of liquid-accumulating trough 6, thereby cost is improved.
For fear of this problem, the simplest method is to reduce the diameter of housing and increase height, and to improve displacement volume, the pressure head that the height of raising housing 10 causes makes back liquid characteristic and oil return characteristic variation.
In order to improve this unfavorable defective, can consider to improve in delivery line the flow velocity of the cold-producing medium that flows, increase by spill port and flow in the pipe and the pressure reduction outside the pipe, thus raising oil return characteristic.Will produce the pressure loss that increases delivery line and the problem that reduces result system on the contrary.
Owing to have above-mentioned hot gas bypass circulation G, therefore,, also hot gas can be blown top (being short transverse) even increased the height of housing 10, and disturbance liquid refrigerant and refrigerator oil efficiently, thereby can realize the effect relevant with the housing height.
Though make oil return characteristic variation on the pressure head increase direction of higher liquid-accumulating trough housing 10, the perturbation action during owing to the injection hot gas reduces the viscosity of oil, thereby guarantees the oil return characteristic.
Fig. 6 represents to control the block diagram of the embodiment of the control assembly 15 that is arranged on the switch valve 12 among the hot gas bypass circulation G.
In step S1, starting compressor is in step 2, with the detected outside air temperature T of temperature sensor
0With the outdoor air design temperature T that is stored in advance in the control assembly 15
01Compare.At T
0Compare T
01(YES) carries out step S3 under the high situation, and control assembly 15 continues to make switch valve 12 to remain on closed condition.
At T
0Compare T
01Under the low situation (NO), the cold-producing medium in judging liquid-accumulating trough 6 is detained carry out step 4 more for a long time, and control assembly 15 is opened switch valve 12.That is to say, open switch valve 12, make the hot gas by-pass flow in liquid-accumulating trough 6, thereby can obtain above-mentioned effect.
No matter be step S3 or step S4, all proceed to step S5, make and wait for the elapsed time t1 of regulation actuation time.Carry out step S6 behind the elapsed time t1, the detected temperature T d that is connected the cold-producing medium P of compressor 1 exhaust side is compared with the design temperature Td1 that is stored in the refrigerant pipe P in the control assembly 15 in advance
Under the Td situation lower (YES) than Td1, carry out step S8, control assembly 15 is transformed into switch valve 12 position of pass.That is to say that the delivery temperature of judgement compressor 1 is higher than setting value, and the whole raising of refrigerant temperature, so just needn't make hot gas by-pass flow in liquid-accumulating trough 6, and switch valve 12 cuts out.
Under the Td situation higher (YES) than Td1, carry out step S7, calculating then, compares with the design temperature Δ Td1 of the refrigerant pipe P of exhaust side in the unit interval that is stored in advance in the control assembly 15 at the temperature Δ Td of the refrigerant pipe P of unit interval inner compressor 1 exhaust side.
Calculate the temperature Δ Td of the exhaust side refrigerant pipe P of unit interval inner compressor 1 than the high situation of the design temperature Δ Td1 that is stored in the unit interval in the control assembly 15 in advance under (YES), get back to step S7, control assembly 15 makes switch valve 12 continue to remain on the state of pass.
Calculate the temperature Δ Td of the exhaust side refrigerant pipe P of unit interval inner compressor 1 than the low situation of the design temperature Δ Td1 that is stored in the unit interval in the control assembly 15 in advance under (NO), carry out step S9, the position that control assembly 15 is transformed into out switch valve 12 makes the hot gas by-pass flow in liquid-accumulating trough 6 that discharges
By carrying out this control, can positively judge the state that cold-producing medium in the liquid-accumulating trough 6 or refrigerator oil are in easy delay, thereby effectively utilize the hot gas bypass.
Fig. 7 (A) is the cooling cycle system figure of the air-conditioner with control device that hot gas bypass circulation G is controlled of another embodiment, and Fig. 7 (B) is the block diagram of working control.
Refrigeration cycle K and aforesaid hot gas bypass circulation G are identical, thereby omit the explanation to the parts of same reference numerals.
As a kind of control method, on as the ingress pipe Pa of the primary side of liquid-accumulating trough 6, first temperature sensor 21 is installed, on as the delivery line Pb of secondary side second temperature sensor 22 is installed, each temperature sensor 21,22 is electrically connected on the control assembly (not shown).
When in 1 starting of step U1 compressor, at step U2, first temperature sensor 21 sends the signal of the temperature of liquid-accumulating trough 6 primary sides that detect to control assembly.In addition, second temperature sensor 232 sends the signal of the temperature of liquid-accumulating trough 6 secondary sides that detect to control assembly.
Control assembly is compared the temperature difference (T1-T2) of the temperature T 2 of the temperature T 1 of primary side and secondary side with design temperature difference DELTA Ta in being stored in control assembly in advance.If the difference of T1 and T2 is higher than design temperature difference DELTA Ta (YES), judge that then liquid refrigerant or the refrigerator oil in liquid-accumulating trough 6 is detained, carry out step U3 then, open switch valve 12, make the hot gas by-pass flow in liquid-accumulating trough 6 that discharges.
In addition, at step U2, when the difference of T1 and T1 during less than design temperature difference DELTA Ta (NO), judging does not need to make the hot gas by-pass flow in liquid-accumulating trough 6, carry out step U3 then, closes switch valve 12.
At step U3, make hot gas in liquid-accumulating trough 6 after the by-pass flow, first temperature sensor 21 and second temperature sensor 22 carry out temperature detection continuously, and send detection signal to control assembly.
At step U5, compare with the temperature gap Δ Tb that sets at the control assembly another kind.The temperature gap Δ Tb of this setting puts up a question the temperature difference that whether exists between above-mentioned T1 and the T2 to a certain degree just greater than 0.
If the temperature difference of T1 and T2 is lower than design temperature difference DELTA Tb (YES), judge that then liquid refrigerant and the refrigerator oil in the liquid-accumulating trough 6 discharged fully, and only remaining gaseous refrigerant, at this moment carry out step U6, switch valve 12 cuts out.
If at step U5, the difference of T1 and T2 is then judged liquid refrigerant remaining in the liquid-accumulating trough 6 and Chuck Steak greater than design temperature difference DELTA Tb (NO), carries out step U3 then, and switch valve 12 is opened.
Utilization is provided with this control device, and hot gas needn't be provided, and so just can prevent that result system from reducing.And switch valve 12 can promptly be moved according to the state variation in the liquid-accumulating trough 6, and improve oil return characteristic and anti-non-return liquid by disturbance and evaporation.
In addition, in above-mentioned control device, the checkout gear (for example pressure sensor 23) that detects the refrigerant superheat degree is set on the ingress pipe Pa as liquid-accumulating trough 6 primary sides, the degree of superheat that is preferably in liquid-accumulating trough 6 primary sides reaches desired value, and when the difference of T1 and T2 is higher than setting value Δ ta, open switch valve 12.
In a word, owing to only greater than the design temperature difference time, only open switch valve 12 in the temperature of liquid-accumulating trough 6 primary sides and the temperature difference of secondary side, so utilize the temperature difference of liquid-accumulating trough 6 front and back, detect its inner liquid holdup state, thereby only when preserving liquid refrigerant, obtain because the perturbation action that the by-pass flow of hot gas causes.
Fig. 8 is the diverse refrigerant-cycle systems figure with air-conditioner of hot gas bypass circulation Ga of structure.Refrigeration cycle K itself is with aforesaid identical, thereby omission is to the description of the parts of same reference numerals
1 exhaust side refrigerant pipe P tells bypass pipe 11 from compressor, is provided with switch valve 12 and first capillary 25 that is connected liquid-accumulating trough housing 10 bottoms on this bypass pipe 11.
In addition, the bypass pipe 11 between the switch valve 12 and first capillary 25 tell another bypass pipe 11a midway, on this bypass pipe 11a, be provided with second capillary 26, the delivery line Pb that it is connected above-mentioned liquid-accumulating trough 6 secondary sides midway.
That is to say that above-mentioned hot gas bypass circulation Ga is provided with shunting part and introduce the loop of bottom of liquid-accumulating trough 6 and shunting a part and loop of introducing the secondary side of liquid-accumulating trough 6 from the hot gas that compressor 1 is discharged from the hot gas that compressor 1 is discharged in parallel.
In the upstream in each loop switch valve 12 is set, and capillary (throttling arrangement) 25,26 is set on each loop.When these capillaries 25,26 play the noise suppression measure of cold-producing medium flow is adjusted.
Utilize this structure, when making cold-producing medium and refrigerator oil be trapped in the liquid-accumulating trough 6, open switch valve 12, make the hot gas by-pass flow,, reflux and evaporation characteristic thereby improve in liquid-accumulating trough 6, to carry out disturbance, evaporation.
In addition, even be back to the gaseous refrigerant cooling of compressor 1 by delivery line Pb after, also can heat cold-producing medium from the hot gas in loop with second capillary 26 as liquid-accumulating trough 6 secondary sides.
That is to say,, injected hot gas to the suction side of compressor 1 again owing to the bypass effect of both having kept in the liquid-accumulating trough 6, so behind beginning cold-starting and the Defrost operation, and when the drop pipe arrangement, can prevent ultra-low pressure significantly.
When utilization is handled the liquid refrigerant evaporation and two layers is separated the perturbation action of liquid-accumulating trough 6, can obtain to add the air-breathing effect of thermocompressor 1, and can improve startability (preventing low-voltage power-off) and prevent and compressor 1 is turned cold, thereby can guarantee reliability owing to suction temperature is low.
Fig. 9 is by a plurality of outdoor unit M1, the system diagram of the kind of refrigeration cycle of the so-called compound air conditioner device that M2 and not shown indoor unit are combined into.
At each outdoor unit M1, among the M2, comprise oil eliminator 30, four-way change-over valve 2, outdoor heat exchanger 3, fluid storage tank 31 and the liquid-accumulating trough 6 of multiple compressors 1, monomer.
And, utilize balanced loop B that outdoor unit M1 and M2 are interconnected.This balanced loop B will be configured in outdoor unit M1, and the compressor 1 on the M2 directly is communicated with, and has shunting circuit simultaneously, and this shunting circuit is connected on the secondary side of suction side, oil eliminator 30 and hopper 31 of compressor 1.
At above-mentioned outdoor unit M1, among the M2, be provided with from the refrigerant pipe P between oil eliminator 30 and the four-way change-over valve 2 shunting and be connected bypass pipe 11 on the liquid-accumulating trough 6, this bypass pipe 11 is provided with the hot gas bypass circulation G that comprises switch valve 12 and capillary 13.
Outdoor unit M1, M2 is connected on not shown a plurality of indoor units by main gaseous refrigerant pipe PG and main liquid refrigerant pipe PL.Hold the interior heat exchanger of having family in each indoor unit, constitute compound kind of refrigeration cycle thus.
According at least one outdoor unit (for example M1) in a plurality of outdoor units of service condition continuation operation, and remaining outdoor unit out of service (for example M2).
At this moment, the balanced loop B of (shown in dashdotted arrow among the figure) during by heat supply retrieves the cold-producing medium of the main gaseous refrigerant pipe PG when the outdoor unit M2 that stops side being in the cooling of low-pressure balance.
But the outdoor unit M2 that stops is through behind the gas balance, and the cold-producing medium in the low-pressure line is detained the cold-producing medium that still is in liquid state in a large number, particularly is trapped in the liquid-accumulating trough 6 of the outdoor unit M2 that stops.
According to service condition, when starting the outdoor unit M2 that stops once more, control assembly is opened the switch valve 12 of hot gas bypass circulation G.The part of the hot gas that compressor 1 is discharged flows into liquid-accumulating trough 6 by hot gas bypass circulation G, and makes the liquid refrigerant rapid evaporation of delay.
Therefore, under used compressor 1 whole residing states of outdoor unit M1 out of service, when the outdoor unit M2 that stops to start, at the fixed time hot gas bypass circulation G is opened, hot gas is entered in the liquid-accumulating trough 6, the liquid compression after can avoiding like this starting.
According to above-mentioned the present invention, even taking place two layers with the refrigerator oiliness, separates the liquid refrigerant in the liquid-accumulating trough 6, this liquid refrigerant also can mix with oil reliably, thereby improves the oil return ratio of compressor, and has improved reliability better.
Description of reference numerals:
1... compressor, 6... liquid-accumulating trough, G... hot gas bypass circulation, 12... switch valve, 10... shell Body, Pa... ingress pipe, b... sweep, Pb... delivery line, 18... spill port, 15... control part Part (control device).
Claims (7)
1. aircondition, it comprises the liquid-accumulating trough of the suction side that is arranged on the compressor that constitutes kind of refrigeration cycle, this liquid-accumulating trough separates the refrigerant air-liquid that enters after the evaporation in heat exchanger, and guides the gaseous refrigerant that separates to enter described compressor, it is characterized in that also comprising:
The part of the hot gas that will discharge from described compressor is diverted to the hot gas bypass circulation the described liquid-accumulating trough, and an end of described hot gas bypass circulation is connected with the bottom of described liquid-accumulating trough;
Be arranged in the described hot gas bypass circulation and the switch valve that carries out switch control according to service condition.
2. according to the aircondition of claim 1, wherein said liquid-accumulating trough comprises housing; The cold-producing medium that is connected on the described housing and is used for evaporating imports the ingress pipe in the housing; Have near bend to U font roughly the bottom in housing sweep and make gaseous refrigerant after the gas-liquid separation be directed to the delivery line of compressor from the openend of housing upper opening; Be back to the spill port of compressor with the lubricating oil that is trapped in housing bottom in the bend office of this delivery line opening and guiding;
Described spill port is arranged on the opposite side with respect to the link position of described hot gas bypass circulation on described liquid-accumulating trough housing of described delivery line, and described link position is than the inboard height of described delivery line sweep.
3. according to the aircondition of claim 2, the cold-producing medium that wherein said kind of refrigeration cycle is used is a high-pressure refrigerant.
4. according to the aircondition of claim 1 or 3, wherein also comprise control device, outside air temperature was than under the low situation of design temperature when described control device started at heat supply running, or change under the little situation than design temperature in the variations in temperature of the refrigerant pipe of the compressor air-discharging side after the starting, the described switch valve that is arranged on the described hot gas bypass circulation is opened.
5. according to the aircondition of claim 1 or 3, wherein also comprise control device, described control device during greater than set temperature value, is opened the described switch valve that is arranged on the described hot gas bypass circulation in the temperature difference of the temperature of liquid-accumulating trough primary side and secondary side.
6. according to the aircondition of claim 1 or 5, the part of the hot gas that a part that is provided with the hot gas that will discharge from described compressor on the wherein said hot gas bypass circulation in parallel is diverted to the loop of described liquid-accumulating trough bottom, will discharge from compressor is diverted to the loop of liquid-accumulating trough secondary side; And the upstream side in each loop is provided with described switch valve, on each loop throttling arrangement is set.
7. according to the aircondition of claim 3, wherein said high-pressure refrigerant is R410 or R32.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003057311 | 2003-03-04 | ||
| JP2003057311A JP4295530B2 (en) | 2003-03-04 | 2003-03-04 | Air conditioner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1526994A CN1526994A (en) | 2004-09-08 |
| CN100387907C true CN100387907C (en) | 2008-05-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100312029A Expired - Lifetime CN100387907C (en) | 2003-03-04 | 2004-03-03 | Air conditioning apparatus |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4295530B2 (en) |
| CN (1) | CN100387907C (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP4295530B2 (en) | 2009-07-15 |
| CN1526994A (en) | 2004-09-08 |
| JP2004263995A (en) | 2004-09-24 |
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