CN105431692A - Refrigeration circuit - Google Patents
Refrigeration circuit Download PDFInfo
- Publication number
- CN105431692A CN105431692A CN201380077073.4A CN201380077073A CN105431692A CN 105431692 A CN105431692 A CN 105431692A CN 201380077073 A CN201380077073 A CN 201380077073A CN 105431692 A CN105431692 A CN 105431692A
- Authority
- CN
- China
- Prior art keywords
- sub
- condenser
- refrigerating circuit
- cooled
- cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005057 refrigeration Methods 0.000 title abstract description 6
- 239000003507 refrigerant Substances 0.000 claims abstract description 57
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 38
- 238000005259 measurement Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 239000007791 liquid phase Substances 0.000 claims 2
- 239000012071 phase Substances 0.000 claims 1
- 238000005191 phase separation Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000010339 dilation Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
Classifications
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- 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
- F25B40/00—Subcoolers, desuperheaters or superheaters
- F25B40/02—Subcoolers
-
- 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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/04—Details of condensers
- F25B2339/044—Condensers with an integrated receiver
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/19—Calculation of parameters
-
- 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
- F25B2500/00—Problems to be solved
- F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
- F25B2500/222—Detecting refrigerant leaks
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2106—Temperatures of fresh outdoor air
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21163—Temperatures of a condenser of the refrigerant at the outlet of the condenser
-
- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21174—Temperatures of an evaporator of the refrigerant at the inlet of the evaporator
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
- Air Conditioning Control Device (AREA)
Abstract
A refrigeration circuit (1a) comprises in the direction of flow of a circulating refrigerant a compressor unit (2) for compressing the refrigerant, a condenser (4), and at least one evaporator (10) having an expansion device (6) connected upstream thereof. The refrigeration circuit (1a) further comprises a subcooling temperature sensor (6) located at an outlet of the condenser (4) for measuring the temperature of refrigerant leaving the condenser (4), a control unit (12) functionally connected to the subcooling temperature sensor (6) and configured for detecting a leak in the refrigeration circuit (1a) based on the refrigerant temperature measured by the subcooling temperature sensor (6). The condenser (4) comprises a liquefying portion (4a) configured for at least partially liquefying the refrigerant and a subsequent subcooling portion (4b) configured for subcooling and storing liquefied refrigerant, and the outlet of the condenser (4), particularly the outlet of the subcooling portion (4b), is connected to the expansion device (8) of the at least one evaporator (10) through a receiver-free connection line (7).
Description
The present invention relates to a kind of refrigerating circuit, and relate to a kind of refrigerating circuit comprising device for leak detection particularly.
The refrigerating circuit flow direction of circulating refrigerant comprised for the compressor unit of compressed refrigerant, at least one condenser and at least one evaporimeter (having connection expansion gear at its upstream) is well known in the art.
In order to allow refrigerating circuit valid function, need optimum refrigerant charge.This optimum charging amount changes with environmental condition (such as environment temperature) and cooling capacity (such as by the quantity of the cooling cabinet/refrigerating chamber of supply).In order to ensure corresponding optimum charging amount under all possible environmental condition, usually provide refrigerant receiver (or buffer).The current unwanted excess liquid cold-producing medium of Optimum Operation of described refrigerant receiver storage system, and if if need more cold-producing mediums or system to lose cold-producing medium due to leakage, then get back to system by liquid refrigerant release.Described receiver is equipped with the device for detecting the fluid level be stored in receiver usually, such as liquid level sensor.When cold-producing medium loses due to leakage, the level one being stored in the cold-producing medium in receiver drops to lower than predetermined minimum fluid level, and liquid level sensor just provides alarm signal.But the amount of the cold-producing medium included by system is usually significantly greater than the amount of cold-producing medium required under most operating conditions, so system can reach predetermined minimum refrigerant level and large losses cold-producing medium before initiating alarm.
Therefore will it is beneficial that provide a kind of refrigerating circuit comprising the leak detecting device of improvement, the leak detecting device of described improvement allows even very little leakage refrigerating circuit being detected at the commitment leaked.
It is beneficial that provide a kind of further low cost to produce and operate and take the refrigerating circuit in only very little space.
A kind of refrigerating circuit according to exemplary of the present invention comprises on the flow direction of circulating refrigerant: for the compressor unit of compressed refrigerant; Condenser; And at least one evaporimeter, it has connection expansion gear at its upstream; Refrigerating circuit also comprises: sub-cooled temperature sensor, and its exit being positioned at condenser is for measuring the temperature leaving the cold-producing medium of condenser; Control unit, it is functionally connected to sub-cooled temperature sensor and is arranged to the leakage detected based on the refrigerant temperature by sub-cooled temperature sensor measurement in refrigerating circuit, wherein condenser comprises: liquefaction portion, and it is arranged to and cold-producing medium is liquefied at least in part; And sub-cooled part subsequently, it is arranged to sub-cooled and stores liquefied refrigerant; The wherein outlet of outlet, specifically the sub-cooled part of condenser, by being connected to the expansion gear of at least one evaporimeter without the connecting line of receiver.Sub-cooled part is directly connected to liquefaction portion, namely when without the other device being arranged between liquefaction portion and sub-cooled part, or only by means of such as with reference to the gas-liquid separator that Fig. 3 describes in detail.
A kind of comprising the following steps for the method detecting the leakage in refrigerating circuit according to other exemplary of the present invention: compressed refrigerant; Cold-producing medium is liquefied at least in part in the liquefaction portion of condenser; The cold-producing medium of liquefaction is at least partly made to flow to the sub-cooled part subsequently of condenser from liquefaction portion; Sub-cool agent in the sub-cooled part of condenser; With directly, without the mode of receiver, by the expansion gear of cold-producing medium from the outlets direct of the outlet of condenser, specifically sub-cooled part at least one evaporimeter, and vaporized refrigerant; Described method is further comprising the steps of: measure the temperature leaving the liquid refrigerant of the sub-cooled part of condenser; And the leakage detected based on the fluid temperature by sub-cooled temperature sensor measurement in refrigerating circuit.The cold-producing medium of at least part of liquefaction is guided directly into liquefaction portion, namely when without the other device being arranged between liquefaction portion and sub-cooled part, or only by means of such as with reference to the gas-liquid separator that gaseous parts is separated with liquid part that Fig. 3 describes in detail.
Referring to accompanying drawing, exemplary of the present invention is described in detail, in the drawing:
Fig. 1 illustrates the schematic diagram of the refrigerating circuit according to the first exemplary of the present invention.
Fig. 2 illustrates the schematic diagram of the refrigerating circuit according to the second exemplary of the present invention.
Fig. 3 illustrates the schematic diagram of the refrigerating circuit according to the 3rd exemplary of the present invention.
Fig. 1 illustrates the schematic diagram of the refrigerating circuit 1a according to the first exemplary of the present invention.
Refrigerating circuit 1a comprises on the flow direction of the circulating refrigerant indicated by arrow A: compressor unit, and it comprises at least one compressor 2 for compressed refrigerant; At least one condenser 4; And at least one evaporimeter 10, it has connection corresponding expansion gear 8 at its upstream.
At least one condenser 4 comprises: upstream side liquefaction portion 4a, and its fluid is connected to the outlet of compressor 2 and is arranged to the cold-producing medium supplied by compressor 2 is liquefied at least in part; And downstream sub-cooled part 4b subsequently, it is arranged to sub-cooled and also stores the cold-producing medium liquefied by the liquefaction portion 4a of condenser 4.The outlet of liquefaction portion 4a is directly connected to liquefaction portion 4b, namely liquefaction portion 4a and sub-cooled part 4b be integral with each other and/or be connected by means of the connecting line without receiver, the cold-producing medium liquefied in liquefaction portion 4a is directly flow to sub-cooled part 4b from liquefaction portion 4a.The outlet of the outlet of condenser 4, specifically sub-cooled part 4b, the expansion gear 8 of at least one evaporimeter 10 is connected to by means of connecting line 7 fluid without receiver, make liquefaction and subcooled cold-producing medium directly, namely when flowing to expansion gear 8 without when receiver from sub-cooled part 4b, and without the need to through another device, particularly without the need to through receiver.
The sub-cooled part 4b of condenser 4 is not only arranged to sub-cooled liquefaction cold-producing medium, and under current environmental condition, operates unwanted any excess liquid cold-producing medium, to meet actual cooling requirement for storing refrigerating circuit 1a.Therefore, in contrast to the prior art, the other receiver being provided for oversaving cold-producing medium is not needed.
Sub-cooled temperature sensor 6 is arranged on the exit of the sub-cooled part 4b of condenser 4, leaves the liquefaction of condenser 4 and the temperature of subcooled cold-producing medium to measure.
For making liquefaction and the expansion gear 8 that subcooled cold-producing medium expands is arranged on the downstream of sub-cooled temperature sensor 6.The swell refrigeration agent leaving expansion gear 8 is delivered to fluid and is connected at least one evaporimeter 10 between the outlet of expansion gear 8 and the entrance of at least one compressor 2.In at least one evaporimeter 10 described, cold-producing medium is evaporated, thus provides the cooling capacity of required refrigerating circuit 1a.
In exemplary in FIG, only single compressor 2, single condenser 4, single expansion device 8 and single evaporimeter 10 are shown respectively; But technical staff will readily appreciate that: if necessary or desired, often kind of device in multiple described device 2,4,8,10 can be provided.Such as, can provide the multiple evaporimeters 10 comprising the expansion gear 8 that is associated respectively, to provide multiple radiator, described multiple radiator is arranged in the many REFC display cases such as in supermarket.
Sub-cooled temperature sensor 6 is such as connected to control unit 12 functionally electrically, and described control unit 12 is arranged to by monitoring the temperature signal that provided by sub-cooled temperature sensor 6 and operates as leak detection system.Specifically, control unit 12 can be configured to the actual temperature signal provided by sub-cooled temperature sensor 6 and predetermined temperature to compare, and described predetermined temperature calculates by means of the calculating be arranged in control unit 12 and/or memory cell 14 and/or stores.
If control unit 12 detects that cold-producing medium leaks from refrigerating circuit 1a, so it such as, by means of being functionally connected at least one suitable alarm device 16,18 of control unit 12 to initiate alarm, optics and/or acoustic alert.Additionally or alternately, control unit 12 can stop the operation of compressor 2, to avoid further loss cold-producing medium.Alternately, compressor 2 deceleration-operation can be made, to be provided to the refrigerating capacity of small part when not losing too many cold-producing medium.
Calculate and/or predetermined temperature that memory cell 14 will can compare with the temperature measured based on the temperature computation predetermined temperature measured by least one other temperature sensor 20,22,24,26 or select from multiple storing value, the farther position that at least one other temperature sensor 20,22,24,26 described comprises such as air temperature sensor 20 and/or is arranged on refrigerating circuit 1a is for the refrigerant temperature sensors 22,24,26 measured in the temperature of the cold-producing medium of refrigerating circuit 1a Inner eycle.
The calculating of predetermined temperature and/or select also can based on external value, such as cooling capacity needed for operating personnel input by means of the input unit 28 being connected to control unit 12.
Overheated and the cooling capacity of having carried out for wherein evaporating temperature, evaporimeter 10 place has kept the example calculation of constant refrigerating circuit:
Evaporating temperature-10 DEG C
Cross hot vaporizer 10K
Cooling capacity 100kW
In a first step, on inspection under constant refrigerant charge environment temperature on subcooled impact:
1. initial fill amount:
input:
Refrigerant charge 23.4kg
Environment temperature T
amb35 DEG C
export:
Sub-cooled temperature T
sub3K
2. the change of environment temperature:
input:
Refrigerant charge 23.4kg
Environment temperature T
amb25 DEG C
export:
Sub-cooled temperature T
sub4.7K
That is, environment temperature T
ambfor Δ T
ambthe reduction of=-10 DEG C causes the sub-cooled temperature T measured by temperature sensor 6
subfor Δ T
subthe increase (from 3K to 4.7K) of=+ 1.7K.
In the second step, the impact of charging amount loss on sub-cooled temperature under constant ambient temperature has been assessed:
1. initial fill amount
input:
Environment temperature T
amb25 DEG C
Refrigerant charge 23.4kg
export:
Sub-cooled T
sub4.7K
Charging amount loss (=1.17kg) of 2.5%
input:
Environment temperature T
amb25 DEG C
Refrigerant charge 22.21kg
export:
Sub-cooled T
sub3.6K
Therefore, between the expectation sub-cooled temperature and the actual measurement sub-cooled temperature of 3.6K of 4.7K, there is Δ T
subthe difference of=1.1K, there is loss of refrigerant in this instruction in systems in which.
Perform many measuring and calculations even can allow by will expect (calculating) with the sub-cooled temperature T of actual measurement
subcompare the amount determining loss of refrigerant.
Fig. 2 illustrates the schematic diagram of the refrigerating circuit 1b according to the second exemplary of the present invention.
The parts substantially identical with the refrigerating circuit 1a of the first embodiment are comprised according to the refrigerating circuit 1b of the second embodiment, namely comprise on the flow direction of the circulating refrigerant such as indicated by arrow A: compressor unit, it comprises at least one compressor 2 for compressed refrigerant; Condenser 4; And at least one evaporimeter 10a, 10b, it has connection corresponding expansion gear 8a, 8b at its upstream.Mark by identical reference symbol with the parts of the identical refrigerating circuit 1b according to the second embodiment of the corresponding component of the refrigerating circuit 1a according to the first embodiment shown in Fig. 1, and will discuss no longer in detail.
Two or more evaporimeters 10a, 10b is comprised according to the refrigerating circuit 1b of the second exemplary of the present invention, it has corresponding expansion gear 8a, 8b of being connected to each evaporimeter 10a, 10b upstream, the wherein outlet of outlet, specifically the sub-cooled part 4b of condenser 4, be connected to corresponding expansion gear 8a, 8b of two or more evaporimeters 10a, 10b by the connecting line 7 without receiver, the described connecting line 7 without receiver is branched off into branch line 9a, 9b without receiver of being connected with corresponding expansion gear 8a, 8b.
Refrigerant temperature sensors 22,23 can be arranged in each place ducted expansion gear 8a, 8b being connected to corresponding be associated evaporimeter 10a, 10b.
Each expansion gear 8a, 8b can be set to changeable expansion gear 8a, the 8b that can switch between open mode and closed condition, in open mode, it makes to expand at the cold-producing medium of refrigerating circuit 1b Inner eycle, in off position, its block refrigerant flows through be associated evaporimeter 10a, 10b, thus allows optionally to activate the operation with each evaporimeter of deactivation 10a, 10b.
As another option, the dilation provided by expansion gear 8a, 8b can be adjustable.
Also single common expansion gear 8 is likely used to be delivered to two or more evaporimeters 10a, 10b for by swell refrigeration agent.
Fig. 3 illustrates the schematic diagram of the refrigerating circuit 1c according to the 3rd exemplary of the present invention.
The parts substantially identical with the refrigerating circuit 1a of the first embodiment are comprised according to the refrigerating circuit 1c of the 3rd embodiment, namely comprise on the flow direction of the circulating refrigerant such as indicated by arrow A: compressor unit, it comprises the compressor 2 for compressed refrigerant; Condenser 40; And evaporimeter 10, it has connection corresponding expansion gear 8 at its upstream.Mark by identical reference symbol with the parts of the identical refrigerating circuit 1c according to the 3rd embodiment of the corresponding component of the refrigerating circuit 1a according to the first embodiment shown in Fig. 1, and will discuss no longer in detail.
Difference according to the condenser 40 of the 3rd embodiment and the condenser 4 of the first embodiment is: between the liquefaction portion 40a and sub-cooled part 40b subsequently of condenser 40, provide gas-liquid separator 42.
Gas-liquid separator 42 is arranged to and is separated with liquid part by the gas fraction of gas-liquid mixture, when the condensing capacity of liquefaction portion 40a is not enough to be delivered to all gaseous refrigerants of liquefaction portion 40a of condenser 40 for condensation from compressor 2, described gas-liquid mixture leaves the liquefaction portion 40a of condenser 40.In the 3rd embodiment, the liquid part of gas-liquid mixture is delivered to the sub-cooled part 40b of condenser 40 for sub-cooled and storage, as the same in the first embodiment shown in FIG, and the gas fraction of the gas-liquid mixture of separation is delivered by means of gas backstreaming line 44 and gets back to liquefaction portion 40
aentrance, to be also liquefied through liquid part 40a again.
Therefore, according in the refrigerating circuit 1c of the 3rd embodiment, only liquefied refrigerant is delivered to the sub-cooled part 40b of condenser 40, and this improves the efficiency of sub-cooled part 40b.This promotes the efficiency of refrigerating circuit 1c, because according in the refrigerating circuit 1b of the 3rd embodiment, leave condenser 40 and enter at least one expansion gear 8 without gaseous refrigerant.
Refrigerating circuit according to exemplary of the present invention comprises on the flow direction of circulating refrigerant: a compressor unit, and it is for compressed refrigerant; At least one condenser; And at least one evaporimeter, it has connection expansion gear at its upstream.Condenser comprises: liquefaction portion, and it is arranged to and cold-producing medium is liquefied at least in part; And sub-cooled part subsequently, it is arranged to sub-cooled and stores liquefied refrigerant.The outlet of liquefaction portion is connected to sub-cooled part by means of the connecting line without receiver, make liquefied refrigerant directly, namely when flowing to sub-cooled part without when receiver from liquefaction portion.The outlet of the outlet of condenser, specifically sub-cooled part, by means of directly, be connected to the expansion gear of at least one evaporimeter particularly without the connecting line of receiver, make to leave the liquefaction of condenser and subcooled cold-producing medium from sub-cooled partial-flow to expansion gear, and without the need to through another device, particularly without the need to through receiver.
A kind of comprising the following steps for the method detecting the leakage in refrigerating circuit according to exemplary of the present invention: compressed refrigerant; Cold-producing medium is liquefied at least in part in the liquefaction portion of condenser; The cold-producing medium liquefied at least partly is directed to the sub-cooled part immediately subsequently of condenser from liquefaction portion; Sub-cool agent in the sub-cooled part of condenser; With directly, namely without the mode of receiver, by the expansion gear of cold-producing medium from the outlets direct of the outlet of condenser, specifically sub-cooled part at least one evaporimeter, and vaporized refrigerant.Described method is further comprising the steps of: measure the temperature leaving the liquid refrigerant of the sub-cooled part of condenser; And the leakage detected based on the fluid temperature by sub-cooled temperature sensor measurement in refrigerating circuit.
Refrigerating circuit according to exemplary of the present invention also comprises: sub-cooled temperature sensor, and it is positioned at the exit of condenser and is arranged to the temperature measured and leave the cold-producing medium of the sub-cooled part of condenser; And control unit, it is functionally connected to temperature sensor and is arranged to the leakage detected based on the refrigerant temperature by temperature sensor measurement in refrigerating circuit.
According to exemplary of the present invention, to measure and condenser is left in monitoring and the temperature leaving the liquefied refrigerant of the sub-cooled part of condenser particularly allows highly reliably and detect the loss of even very little cold-producing medium from refrigerating circuit exactly.Therefore any refrigrant leakage can reliably be detected at the commitment leaked, even if still there is a large amount of cold-producing medium in the loop, and a large amount of cold-producing medium of avoidable loss.
Because the refrigerating circuit according to exemplary of the present invention does not comprise receiver, so save cost and the space for providing this receiver.Therefore, cold loop low cost can be produced and operate and only take very little space.
In one embodiment, control unit comprises the comparing unit being arranged to and temperature and at least one predetermined value by sub-cooled temperature sensor measurement being compared.Allow being compared by the temperature of sub-cooled temperature sensor measurement and at least one predetermined value easily and leak detection reliably, as when leak occur, sub-cooled temperature will change considerably and depart from predetermined value.
In one embodiment, control unit comprises the computing unit being arranged to and calculating predetermined value.This computing unit is provided to allow to calculate predetermined value based on the actual environment of refrigerating circuit and operating condition.Therefore allow neatly predetermined value to be adjusted to described environment and operating condition.
In one embodiment, control unit also comprises memory cell, at least one predetermined value that is that it has calculated before being arranged to storage and/or that be input to from external source memory cell.Storing value is used to allow to save for providing the cost of computing unit and/or allowing to use the predetermined value calculated by means of the simulation carried out in the computer based external analog system of precision as predetermined value.Alternately or additionally, can store and before using, the predetermined value measured during the operation of real system particularly.
In one embodiment, refrigerating circuit comprises at least one the other temperature sensor being functionally connected to control unit, and control unit is arranged to and calculates predetermined value by the temperature value of at least one other temperature sensor measurement by using and/or select predetermined value from multiple storage predetermined value.At least one other temperature sensor can be one in the temperature sensor of the temperature of air temperature sensor or the circulating refrigerant being arranged to the diverse location place measuring refrigerating circuit.This allows temperature predetermined value being adjusted to actual environment temperature and/or the cold-producing medium at refrigerating circuit Inner eycle.
In one embodiment, control unit is configured to after leakage refrigerating circuit being detected, stop the operation of at least one compressor and/or initiate alarm signal, to avoid the further loss of cold-producing medium.
In one embodiment, gas-liquid separator is arranged between the liquefaction portion of condenser and sub-cooled part, the inlet fluid of gas-liquid separator is connected to the outlet of the liquefaction portion of condenser, the gas outlet stream of gas-liquid separator is connected to the entrance of the liquefaction portion of condenser, and the liquid outlet fluid of gas-liquid separator is connected to the entrance of the sub-cooled part of condenser, so as by gaseous delivery to the entrance of liquefaction portion to be liquefied.This gas-liquid separator allows the gas fraction of the gas-liquid mixture of the liquefaction portion by leaving condenser to be separated with liquid part.Only liquid refrigerant is delivered to sub-cooled part and promotes the efficiency of sub-cooled part and the efficiency of refrigerating circuit.
In one embodiment, provide two or more evaporimeters, it has connection corresponding expansion gear at its upstream.In the embodiment described in which, the outlet of the outlet of condenser, specifically sub-cooled part, be connected to the corresponding expansion gear of two or more evaporimeters by the connecting line without receiver, the described connecting line without receiver is branched off into the branch line being connected to corresponding expansion gear.There is provided multiple evaporimeter to allow to provide multiple radiator at diverse location place, such as, be arranged in the many REFC display cases operated by single refrigerating circuit in supermarket.
Although describe the present invention with reference to exemplary, it will be apparent to one skilled in the art that when not deviating from scope of the present invention, various change can be made and equivalent can be used to replace its element.In addition, when not deviating from base region of the present invention, amendment can be made and adapt to religious doctrine of the present invention to make concrete condition or material.Therefore, the present invention is not intended to be limited to disclosed specific embodiments, but the present invention will comprise all embodiments fallen within the scope of appended claims.
Reference number row Yuan
1a, 1b, 1c refrigerating circuit
2 compressor units
4,40 condensers
4a, 40a liquefaction portion
4b, 40b sub-cooled part
6 sub-cooled temperature sensors
7 without the connecting line of receiver
8,8a, 8b expansion gear
9a, 9b branch line
10,10a, 10b evaporimeter
12 control units
14 calculate and/or memory cell
16 acoustic alert devices
18 optical alert devices
20 air temperature sensors
22,23,24,26 refrigerant temperature sensors
28 input units
42 gas-liquid separators
44 gas backstreaming lines
Claims (15)
1. refrigerating circuit (1a; 1b; 1c), it comprises on the flow direction of circulating refrigerant:
Compressor unit (2), it is for compressing described cold-producing medium;
Condenser (4,40); And
At least one evaporimeter (10; 10a, 10b), it has connection expansion gear at its upstream (6);
Described refrigerating circuit (1a; 1b; 1c) also comprise
Sub-cooled temperature sensor (6), the temperature of the cold-producing medium of described condenser (4,40) is left in its exit being positioned at described condenser (4,40) for measurement;
Control unit (12), it is functionally connected to described sub-cooled temperature sensor (6), and the refrigerant temperature be arranged to based on being measured by described sub-cooled temperature sensor (6) detects described refrigerating circuit (1a; 1b; Leakage 1c);
Wherein said condenser (4,40) comprising: liquefaction portion (4a, 40a), and it is arranged to and described cold-producing medium is liquefied at least in part; And sub-cooled part (4b, 40b) subsequently, it is arranged to sub-cooled and stores liquefied refrigerant; And
The outlet of the described outlet of wherein said condenser (4,40), specifically described sub-cooled part (4b, 40b), by being connected at least one evaporimeter (10 described without the connecting line (7) of receiver; 10a, 10b) described expansion gear (8; 8a, 8b).
2. refrigerating circuit (1a according to claim 1; 1b; 1c), wherein, described sub-cooled part (4b, 40b) and described liquefaction portion (4a, 40a) when without another Plant arrangement betwixt or be only connected by means of gas-liquid separator (42).
3. refrigerating circuit (1a according to claim 1 and 2; 1b; 1c), wherein said control unit (12) comprises the comparing unit (14) being arranged to and the temperature measured by described sub-cooled temperature sensor (6) and predetermined value being compared.
4. refrigerating circuit (1a according to claim 3; 1b; 1c), wherein said control unit (12) also comprises the computing unit (14) being arranged to and calculating described predetermined value.
5. refrigerating circuit (the 1a according to claim 3 or 4; 1b; 1c), wherein said control unit (12) also comprises the memory cell (14) being arranged to and storing at least one predetermined value.
6. refrigerating circuit (the 1a according to claim 4 or 5; 1b; 1c), it also comprises at least one the other temperature sensor (20,22,23,24,26) being functionally connected to described control unit (12), and wherein said control unit (12) is arranged to and uses the temperature value measured by described at least one other temperature sensor (20,22,23,24,26) calculate and/or select described predetermined value.
7. refrigerating circuit (1a according to claim 6; 1b; 1c), wherein said at least one other temperature sensor (20,22,23,24,26) is air temperature sensor (20) and is arranged to measurement at described refrigerating circuit (1a; 1b; At least one in the temperature sensor (22,23,24,26) of the 1c) temperature of the described cold-producing medium of Inner eycle.
8. refrigerating circuit (the 1a according to any one of claim 4 to 7; 1b; 1c), wherein said control unit (12) is configured to reduce after the leakage described refrigerating circuit (1c) being detected or even stop the operation of described at least one compressor (2) and/or initiate alarm signal.
9. according to refrigerating circuit in any one of the preceding claims wherein (1c), wherein between gas-liquid separator (42) the described liquefaction portion (4a, 40a) that is disposed in described condenser (4,40) and described sub-cooled part (4b, 40b), the inlet fluid of described gas-liquid separator (42) is connected to the outlet of the described liquefaction portion (4a, 40a) of described condenser (4,40).
10. refrigerating circuit according to claim 9 (1c), be connected to the entrance of described condenser (4,40), and the liquid outlet fluid of wherein said gas-liquid separator (42) is connected to the entrance of the sub-cooled part (4b, 40b) of described condenser (4,40) gas outlet stream of wherein said gas-liquid separator (42).
11. according to refrigerating circuit in any one of the preceding claims wherein (1b), two or more evaporimeters (10a, 10b) are wherein provided, it has connection corresponding expansion gear (8a, 8b) at its upstream, and the described outlet of the described outlet of wherein said condenser (4,40), specifically described sub-cooled part (4b, 40b), is connected to two or more evaporimeters (10 described by the connecting line (7) without receiver; 10a, 10b) described corresponding expansion gear (8a, 8b), the described connecting line without receiver (7) is branched off into the branch line without receiver (9a, 9b) being connected to described corresponding expansion gear (8a, 8b).
12. for detecting refrigerating circuit (1a; 1b; The method of the leakage 1c), it comprises the following steps
Compressed refrigerant;
Described cold-producing medium is liquefied at least in part in the liquefaction portion (4a, 40a) of condenser (4,40);
The cold-producing medium of described at least part of liquefaction is made to flow to the sub-cooled part (4b, 40b) subsequently of described condenser (4,40) from the described liquefaction portion (4a, 40a) of described condenser (4,40);
Cold-producing medium described in sub-cooled in the described sub-cooled part (4b, 40b) of described condenser (4,40);
In the mode without receiver, by described cold-producing medium from the outlets direct of the outlet of described condenser (4,40), specifically described sub-cooled part (4b, 40b) at least one evaporimeter (10; 10a, 10b) expansion gear (8; 8a, 8b), and evaporate described cold-producing medium;
Described method is further comprising the steps of
The temperature of the described liquid refrigerant of the described sub-cooled part (4b, 40b) of described condenser (4,40) is left in measurement; And
Described refrigerating circuit (1a is detected based on the liquid refrigerant temperature measured by described sub-cooled temperature sensor (6); 1b; Leakage 1c).
13. methods according to claim 12, the cold-producing medium of wherein said at least part of liquefaction is directed into described sub-cooled part (4b, 40b) from described liquefaction portion (4a, 40a), and without the need to passing through another device except optional gas-liquid separator (42).
14. methods according to claim 12 or 13, wherein said cold-producing medium is by direct, without the connecting line (7) of receiver from the described outlet of described condenser (4), the described outlet of described sub-cooled part (4b) is specifically directed into two or more evaporimeters (10a, 10b), described two or more evaporimeters (10a, 10b) there is connection corresponding expansion gear (8a at its upstream, 8b), the described connecting line without receiver (7) is branched off into and is connected to described corresponding expansion gear (8a, branch line (the 9a without receiver 8b), 9b).
15. according to claim 12 to the method according to any one of 14, and it is further comprising the steps of: by the gas phase of cold-producing medium that liquefies at least partly and liquid phase separation; Described liquid phase is delivered to described condenser (40) described sub-cooled part (40b) and by the described liquefaction portion (40a) of described gaseous delivery to described condenser (40).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2013/061099 WO2014191035A1 (en) | 2013-05-29 | 2013-05-29 | Refrigeration circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105431692A true CN105431692A (en) | 2016-03-23 |
| CN105431692B CN105431692B (en) | 2018-01-02 |
Family
ID=48539158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380077073.4A Expired - Fee Related CN105431692B (en) | 2013-05-29 | 2013-05-29 | Refrigerating circuit |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20160109170A1 (en) |
| EP (1) | EP3004756B1 (en) |
| CN (1) | CN105431692B (en) |
| WO (1) | WO2014191035A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117321362A (en) * | 2021-05-21 | 2023-12-29 | 大金工业株式会社 | Refrigeration cycle device |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000279A1 (en) * | 2015-07-01 | 2017-01-05 | Trane Air Conditioning Systems (China) Co., Ltd. | Heat recovery system with liquid separator application |
| WO2017006462A1 (en) * | 2015-07-08 | 2017-01-12 | 三菱電機株式会社 | Air conditioner |
| DE102016110585A1 (en) * | 2016-06-08 | 2017-12-14 | Truma Gerätetechnik GmbH & Co. KG | Air conditioning system and leak detection method in an air conditioning system |
| US11060775B2 (en) | 2017-03-09 | 2021-07-13 | Lennox Industries Inc. | Method and apparatus for refrigerant leak detection |
| CN110375466B (en) | 2018-04-13 | 2022-10-28 | 开利公司 | Device and method for detecting refrigerant leakage of air source heat pump system |
| CN110375468B (en) | 2018-04-13 | 2022-10-11 | 开利公司 | Air-cooled heat pump system, and refrigerant leakage detection method and detection system for same |
| US11287153B2 (en) * | 2019-12-02 | 2022-03-29 | Lennox Industries Inc. | Method and apparatus for risk reduction during refrigerant leak |
| JP6793862B1 (en) * | 2020-01-14 | 2020-12-02 | 三菱電機株式会社 | Refrigeration cycle equipment |
| JP7260806B2 (en) * | 2021-04-27 | 2023-04-19 | ダイキン工業株式会社 | Air conditioning system, operation control method thereof, and operation control device for air conditioning system |
| CN113701410B (en) * | 2021-09-09 | 2022-08-26 | 珠海格力电器股份有限公司 | Refrigerating unit and refrigerant quantity control method and device thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518639A (en) * | 1991-07-11 | 1993-01-26 | Sanyo Electric Co Ltd | Refrigerator |
| CN1320794A (en) * | 2000-04-26 | 2001-11-07 | 株式会社电装 | Refrigerant circulation system |
| US20070125102A1 (en) * | 2005-12-05 | 2007-06-07 | Carrier Corporation | Detection of refrigerant charge adequacy based on multiple temperature measurements |
| CN103148642A (en) * | 2011-12-07 | 2013-06-12 | 现代自动车株式会社 | Condenser for vehicle |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5802860A (en) * | 1997-04-25 | 1998-09-08 | Tyler Refrigeration Corporation | Refrigeration system |
| AU2002230140B2 (en) * | 2001-02-05 | 2006-08-10 | Showa Denko K.K. | Duplex-type heat exchanger and refrigeration system equipped with said heat exchanger |
| JP5011957B2 (en) * | 2006-09-07 | 2012-08-29 | ダイキン工業株式会社 | Air conditioner |
| JP4803199B2 (en) * | 2008-03-27 | 2011-10-26 | 株式会社デンソー | Refrigeration cycle equipment |
| JP5664063B2 (en) * | 2010-09-21 | 2015-02-04 | 株式会社デンソー | Condenser |
-
2013
- 2013-05-29 CN CN201380077073.4A patent/CN105431692B/en not_active Expired - Fee Related
- 2013-05-29 WO PCT/EP2013/061099 patent/WO2014191035A1/en active Application Filing
- 2013-05-29 US US14/893,290 patent/US20160109170A1/en not_active Abandoned
- 2013-05-29 EP EP13726194.7A patent/EP3004756B1/en not_active Not-in-force
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0518639A (en) * | 1991-07-11 | 1993-01-26 | Sanyo Electric Co Ltd | Refrigerator |
| CN1320794A (en) * | 2000-04-26 | 2001-11-07 | 株式会社电装 | Refrigerant circulation system |
| US20070125102A1 (en) * | 2005-12-05 | 2007-06-07 | Carrier Corporation | Detection of refrigerant charge adequacy based on multiple temperature measurements |
| CN103148642A (en) * | 2011-12-07 | 2013-06-12 | 现代自动车株式会社 | Condenser for vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117321362A (en) * | 2021-05-21 | 2023-12-29 | 大金工业株式会社 | Refrigeration cycle device |
| CN117321362B (en) * | 2021-05-21 | 2024-06-14 | 大金工业株式会社 | Refrigeration cycle device |
Also Published As
| Publication number | Publication date |
|---|---|
| US20160109170A1 (en) | 2016-04-21 |
| EP3004756B1 (en) | 2018-04-11 |
| EP3004756A1 (en) | 2016-04-13 |
| CN105431692B (en) | 2018-01-02 |
| WO2014191035A1 (en) | 2014-12-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105431692A (en) | Refrigeration circuit | |
| GB2564312A (en) | Refrigeration device | |
| EP1856458B1 (en) | Control of a refrigeration circuit with an internal heat exchanger | |
| US11340000B2 (en) | Method for handling fault mitigation in a vapour compression system | |
| US11892210B2 (en) | Valve and capillary tube system for refrigeration systems | |
| JP2017053566A (en) | Refrigeration cycle device | |
| JP5693328B2 (en) | Refrigeration apparatus and refrigerant leakage detection method for refrigeration apparatus | |
| EP2257749B1 (en) | Refrigerating system and method for operating the same | |
| US20170089614A1 (en) | Refrigeration device | |
| WO2021185095A1 (en) | Refrigerant conveying method and apparatus, and refrigerant processing device | |
| JP6723462B2 (en) | Refrigeration equipment | |
| JP6095155B2 (en) | Refrigeration apparatus and refrigerant leakage detection method for refrigeration apparatus | |
| US10845108B2 (en) | Refrigeration device and controller for refrigeration device | |
| JP6588626B2 (en) | Refrigeration equipment | |
| JP6008416B2 (en) | Refrigeration apparatus and refrigerant leakage detection method for refrigeration apparatus | |
| JP5306450B2 (en) | Refrigeration air conditioner and refrigerant filling method thereof | |
| Wongsuwan et al. | Energy Efficiency of the Beverage Vending Machine Refrigeration System | |
| JP3490908B2 (en) | Refrigerant refrigerant leak detection system | |
| JP2012117733A (en) | Refrigeration equipment | |
| JP5756919B2 (en) | Refrigeration equipment | |
| JP5200120B2 (en) | Valve check method for refrigeration circuit | |
| CN213984095U (en) | Refrigerant supply system | |
| CN112503787A (en) | Refrigerant supply system | |
| JP6564658B2 (en) | Refrigeration equipment | |
| JP2019207103A (en) | Refrigeration device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180102 |