CN101413745B - Middle and low temperature integrated type refrigerated storage / refrigerating system with air discharging and defrosting functions - Google Patents
Middle and low temperature integrated type refrigerated storage / refrigerating system with air discharging and defrosting functions Download PDFInfo
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- CN101413745B CN101413745B CN2007101813254A CN200710181325A CN101413745B CN 101413745 B CN101413745 B CN 101413745B CN 2007101813254 A CN2007101813254 A CN 2007101813254A CN 200710181325 A CN200710181325 A CN 200710181325A CN 101413745 B CN101413745 B CN 101413745B
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47F—SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS, STOREHOUSES, BARS, RESTAURANTS OR THE LIKE; PAYING COUNTERS
- A47F3/00—Show cases or show cabinets
- A47F3/04—Show cases or show cabinets air-conditioned, refrigerated
- A47F3/0482—Details common to both closed and open types
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
- F25B47/022—Defrosting cycles hot gas defrosting
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/075—Details of compressors or related parts with parallel compressors
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/22—Refrigeration systems for supermarkets
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Defrosting Systems (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a moderate-and-low temperature integrated cold storage/refrigeration system with the function of exhaust and defrosting. The system comprises a moderate-and-low temperature compressor unit, a moderate-and-low temperature evaporator, control valves, a regulating valve, a one-way valve and an expansion valve; and switchover control is carried out between the refrigeration circulation and the defrosting circulation by the action combination of a plurality of control valves. The invention also discloses a method for switching between two working states in the system. When a first control valve is open, a second control valve is closed, and a fourth control valve is closed to the refrigerant pipeline of a liquid receiver, refrigeration circulation is carried out; when the first control valve is closed, the second control valve is open, and the fourth control valve is closed to the refrigerant pipeline of an inter cooler, exhaust and defrosting are carried out. By adopting the system and the switchover method in the invention, the refrigeration circulation and the exhaust and defrosting circulation are realized, and the heat exchange between a moderate temperature system and a low temperature system can be used for improving the operating efficiency of the entire system.
Description
Technical field
The present invention relates to a kind of refrigerating/freezing display case unit system, relate in particular to a kind of in the refrigerating/freezing display case unit system of low temperature integrated type, be used for showing food and/or beverage products.
Background technology
Under normal conditions, supermarket and convenience store are equipped with many showcases, and these show that cabinets can be open maybe can have door, be used for fresh food or beverage are presented to client, and fresh food or beverage are remained in certain temperature environment.Because air source heat pump or the aerial cooler in refrigeration system are when environment temperature is near or below the freezing point of water, will frosting on the heat exchanger (being also referred to as " evaporimeter ") of heat absorption, thereby cause the heat transfer efficiency of heat exchanger to descend, or even the hydraulic performance decline of whole system.The most conventional Defrost method comprises electricity defrosting and air discharging and defrosting, more specifically, the method that adopts electrical heating to defrost is fairly simple, but its operating efficiency is relatively on the low side, defrosting time long and when defrosting the temperature of fresh food or beverage may obviously raise; And adopt air discharging and defrosting can greatly improve heat-exchange system, and be applied in the refrigeration system more and more widely gradually.
Usually, all refrigeration systems comprise at least with lower member: compressor, condenser, at least one and evaporimeter, the expansion valve of showcase gang and the suitable refrigerant line that links together with said apparatus in the closed circulation loop.Expansion valve is arranged on the upstream with respect to the refrigerant line of the entrance of the flow of refrigerant of the evaporimeter that is used for the expansion liquid state cold-producing medium.This expansion valve is used for calculating liquid refrigerant, and liquid refrigerant is expand into the lower pressure of an expectation, and wherein this low-pressure is chosen according to the particular refrigerant that before entered into evaporimeter.Described in detail with other refrigeration system of different temperatures level now, Fig. 1 shows the structural principle block diagram of middle temperature refrigerating system of the prior art, and Fig. 2 shows the structural principle block diagram of cryogenic refrigeration systems of the prior art.As shown in Figure 1, warm refrigerating system comprises in this: compressor 1, condenser 2, reservoir 3, expansion valve 4 and evaporimeter 5.After processing through the compression of compressor 1 as cold-producing medium, the gas of low-temp low-pressure becomes the gas of HTHP, then, the gas of this HTHP enters condenser 2 and cools off and become the liquid of HTHP and be accompanied by the heat radiation process, then, the liquid of HTHP flow to expansion valve 4 through reservoir 3.As previously mentioned, desired pressure after this expansion valve 4 can select liquid refrigerant to expand according to selected refrigerant type, this expansion valve 4 becomes the liquid throttling of HTHP the liquids and gases two phase flow of low-temp low-pressure, becomes the gas of low-temp low-pressure and absorb heat to form refrigeration from air draught after by evaporimeter 5.Similarly, in cryogenic refrigeration systems shown in Figure 2, also comprise compressor 1, condenser 2, reservoir 3, expansion valve 4, evaporimeter 5 and liquid injection valve 6.In the refrigerant line part that is consisted of by expansion valve 4, evaporimeter 5, compressor 1, condenser 2 and reservoir 3, the course of work of this cryogenic refrigeration systems is similar to middle temperature refrigerating system, but, for this cryogenic refrigeration systems, in order to reduce the delivery temperature of compressor 1, and between compressor 1 and reservoir 3, increased the branch road of a refrigerant line, and be provided with liquid injection valve 6 thereon.Be converted into the gas of low-temp low-pressure when the expansion of liquids of HTHP, in this conversion process, absorb heat and reduce the suction temperature of compressor 1, thereby reduce the delivery temperature of compressor 1, protected better compressor bank.
But warm refrigerating system and cryogenic refrigeration systems are when operation in the employing independently, and refrigerating efficiency is lower, and energy consumes bigger than normal.In order to address this problem, Carrier successfully develop a kind of in low temperature integrated type refrigerated storage/refrigerating system, this integrated form system will be originally independently in warm refrigerating system and cryogenic refrigeration systems be integrated in a CDU unit, then improve the service efficiency of the whole system after integrated by the energy exchange between structural optimization design and two systems.Really, the middle deepfreeze/refrigeration system of this integrated form can improve the operation stability of system, take up room little, and can realize integrative solution and be that the client saves a large amount of installment and debugging spaces " plug and play ".Yet, how air discharging and defrosting technology (D2D) successfully is applied to the middle deepfreeze/refrigeration system of integrated form, be the technical problem that the research and development engineer of refrigerating field is badly in need of solving.
Summary of the invention
For refrigeration system of the prior art existing technological deficiency when integrated middle temperature refrigerating system and the cryogenic refrigeration systems, the invention provides a kind of have air discharging and defrosting functions in low temperature integrated type refrigerated storage/refrigerating system.Adopt this refrigerated storage/refrigerating system of the present invention, not only strengthened refrigerating efficiency, energy savings can also be switched between system's normal operating condition and air discharging and defrosting state, greatly make things convenient for client's use, also the operation stability of system has been brought up to a new rank.
According to one aspect of the present invention, provide a kind of have air discharging and defrosting functions in low temperature integrated type refrigerated storage/refrigerating system.This system integration independently in warm refrigerating system and cryogenic refrigeration systems and it is optimized design, the D2D technology is applied in the integrated form in the cryogenic system.This system comprises at least: middle temperature compressor, cryogenic compressor, condenser, reservoir, charge air cooler, middle temperature evaporimeter, cryogenic vaporizer, and four control valves, two control valves, two check valves and three expansion valves, by controlling the combination of actions between these four control valves, between kind of refrigeration cycle operation and air discharging and defrosting operation, carry out switching controls.
Wherein, when the first control valve is opened and the second control valve is closed, and the 4th control valve is when closing to the refrigerant line of described reservoir, and low temperature integrated type system carries out kind of refrigeration cycle and operates in this.Further, when system carried out the kind of refrigeration cycle operation, the suction temperature of regulating described cryogenic compressor by the first control valve reduced the delivery temperature of described cryogenic compressor.
Wherein, when the first control valve is closed and the second control valve is opened, and the 4th control valve is when closing to the refrigerant line of described charge air cooler, and low temperature integrated type system carries out the air discharging and defrosting operation in this.Further, when system carried out the air discharging and defrosting operation, the suction temperature of regulating described cryogenic compressor by the second control valve reduced the delivery temperature of described cryogenic compressor.
Wherein, when hanging down the temperature integrated type system in this when carrying out kind of refrigeration cycle operation or air discharging and defrosting operation, described middle temperature compressor and described cryogenic compressor all put into operation.
According to another aspect of the present invention, provide a kind of in realize the changing method that kind of refrigeration cycle operation and air discharging and defrosting operate in the low temperature integrated type refrigerated storage/refrigerating system.In this, hang down in the temperature integrated type refrigerated storage/refrigerating system, at least comprise middle temperature compressor, cryogenic compressor, condenser, reservoir, charge air cooler, middle temperature evaporimeter, cryogenic vaporizer, and four control valves, two control valves, two check valves and three expansion valves, utilize the combination of actions between these four control valves, this integrated system can carry out switching controls between kind of refrigeration cycle operation and air discharging and defrosting operation.More specifically, when the first control valve is opened and the second control valve is closed, and the 4th control valve is when closing to the refrigerant line of described reservoir, and low temperature integrated type refrigerated storage/refrigerating system is carried out kind of refrigeration cycle and operated in this; With close when the first control valve and the second control valve is opened, and the 4th control valve is when closing to the refrigerant line of described charge air cooler, this system carries out air discharging and defrosting operation.
Wherein, when described system carried out the kind of refrigeration cycle operation, the suction temperature of regulating described cryogenic compressor by the first control valve reduced the delivery temperature of described cryogenic compressor.
Wherein, when described system carried out the air discharging and defrosting operation, the suction temperature of regulating described cryogenic compressor by the second control valve reduced the delivery temperature of described cryogenic compressor.
Wherein, mounting temperature sensor in this cryogenic vaporizer presets the relevant parameter of described temperature sensor to determine the zero hour and the finish time of air discharging and defrosting.
Adopt of the present invention in low temperature integrated type refrigerated storage/refrigerating system, not only can realize normal kind of refrigeration cycle operation and air discharging and defrosting operation based on middle temperature and pressure contracting unit and low temperature compression unit, the heat exchange in can also utilizing between warm refrigerating system and the cryogenic refrigeration systems improves the operational efficiency of whole integrated system.In addition, be built-in with temperature sensor in the cryogenic vaporizer, can determine quickly the zero hour and the finish time of air discharging and defrosting by the Based Intelligent Control relevant parameter.After further cryogenic vaporizer being carried out again optimal design, can reduce defrosting time, guarantee that defrosting is thoroughly.
Description of drawings
The reader will become apparent various aspects of the present invention after the reference accompanying drawing has been read the specific embodiment of the present invention.Wherein,
Fig. 1 is a kind of structural principle block diagram of middle temperature refrigerating system of the prior art;
Fig. 2 is a kind of structural principle block diagram of cryogenic refrigeration systems of the prior art;
Fig. 3 A shows the structural representation when carrying out normal kind of refrigeration cycle in a kind of air discharging and defrosting system, and Fig. 3 B shows the structural representation when carrying out the air discharging and defrosting operation in this air discharging and defrosting system;
Fig. 4 show a kind of in the structural representation of low temperature integrated type refrigerated storage/refrigerating system;
Fig. 5 show according to the one or more aspects of the present invention have air discharging and defrosting functions in the structural representation of low temperature integrated type refrigerated storage/refrigerating system;
Fig. 6 show as shown in Figure 5 in the principle schematic of low temperature integrated type refrigerated storage/refrigerating system when being in normal operating conditions; And
Fig. 7 show as shown in Figure 5 in the principle schematic of low temperature integrated type refrigerated storage/refrigerating system when being in the air discharging and defrosting state.
The specific embodiment
With reference to the accompanying drawings, the specific embodiment of the present invention is described in further detail.
Fig. 3 A shows the structural representation when carrying out normal kind of refrigeration cycle in a kind of air discharging and defrosting system, and Fig. 3 B shows the structural representation when carrying out the air discharging and defrosting operation in this air discharging and defrosting system.With reference to Fig. 3 A and Fig. 3 B, this air discharging and defrosting system mainly comprises middle temperature compressor, cryogenic compressor, middle temperature evaporimeter, cryogenic vaporizer and control valve 1 to 5.In Fig. 3 A and Fig. 3 B, do not participate in the refrigerant line that circulates when part is illustrated in separately duty shown in the dotted line separately, and participate in the refrigerant line of circulation when part shown in the solid line is illustrated in separately duty separately.From Fig. 3 A, can find out, when system carries out normal kind of refrigeration cycle, after the cold-producing medium of low-temp low-pressure compresses processing through separately middle temperature compressor and cryogenic compressor respectively, the gas transport of the HTHP of opening control valve 1 and middle temperature compressor and cryogenic compressor being discharged is to the condenser (not shown), then through therefrom warm evaporimeter and cryogenic vaporizer turn back in separately the compressor respectively after the part refrigerant circulation line condensation of system.Wherein, after the liquid of HTHP is converted into the gas of low-temp low-pressure through cryogenic vaporizer, need to controls to regulate by the throttling of control valve 4 suction temperature of cryogenic compressor, thereby reduce the delivery temperature of this cryogenic compressor, protect better compressor.From Fig. 3 B, can find out, when system carries out the air discharging and defrosting operation, become the gas of HTHP after warm compressor is processed in the cold-producing medium process of low-temp low-pressure, and enter cryogenic vaporizer by control valve 2 and 3, carry out becoming after the condensation process liquid of HTHP through the part pipeline in the system, get back to middle temperature compressor and get back to cryogenic compressor via control valve 4 and 5 by middle temperature evaporimeter at last.Those skilled in the art is to be understood that, can also add expansion valve at the arrival end of middle temperature evaporimeter, become the liquids and gases two phase flow of low-temp low-pressure with the liquid throttling with HTHP, after by evaporimeter, become the gas of low-temp low-pressure and from air draught, absorb heat to form refrigeration.
Fig. 4 illustrate a kind of in the structural representation of low temperature integrated type refrigerated storage/refrigerating system.With reference to Fig. 4, in this low temperature integrated type refrigerated storage/refrigerating system will be originally independently in warm system and cryogenic system be integrated in the CDU unit, by the heat exchange between middle temperature system and the cryogenic system to improve the performance of integrated system.This integrated system mainly comprises: middle temperature compressor 1, cryogenic compressor 2, condenser 3, reservoir 4, expansion valve 5, charge air cooler 6, control valve 7, expansion valve 8 and 9, cryogenic vaporizer 10 and middle temperature evaporimeter 11.Further, the refrigerating function that the condenser of the condenser of warm system and free-standing cryogenic system has in the compatible stand alone type of 3 while of condenser, and reservoir 4 has been replaced warm system and cryogenic system reservoir separately in the stand alone type.Wherein, the degree of supercooling that charge air cooler 6 and expansion valve 5 are used for regulating low temperature is to improve the overall performance of system.Now briefly introduce as follows to the operation principle of this integrated system: discharge the gas of HTHP in the cold-producing medium process of low-temp low-pressure after warm compressor 1 and cryogenic compressor 2 compressions, this high temperature and high pressure gas is converted into the liquid of HTHP and distributes a large amount of heats after entering condenser 3.When the liquid of this HTHP is divided into three pipelines behind reservoir 3: 9 throttlings become the two phase flow of the liquids and gases of low-temp low-pressure to the first via through expansion valve, be converted into the gas of low-temp low-pressure and absorb heat formation refrigeration after entering warm evaporimeter 11, then get back to middle temperature compressor 1; The second the tunnel through charge air cooler 68 throttlings become two streams of the liquids and gases of low-temp low-pressure with expansion valve, enter to be converted into the gas of low-temp low-pressure and to absorb heat behind the cryogenic vaporizer 10 to form refrigeration, then get back to cryogenic compressor 2; And Third Road regulates the degree of supercooling of low temperature through expansion valve 5 and charge air cooler 6, and cold-producing medium is crossed the suction temperature of getting back to middle temperature compressor 1 after cold and regulating the low temperature level by control valve 7 to get back to cryogenic compressor 2.This shows, in this integrated system, cross the liquid temp that supplies of cold low temperature level by intermediate heat exchanger (charge air cooler 6), and utilize Conversion of Energy to improve the efficient of low temperature level.Experimental data shows, the Energy Efficiency Ratio of low temperature level is 1.1, and the Energy Efficiency Ratio of middle temperature level is 2.2.Like this, can improve the performance of whole integrated system and the operation stability of middle cryogenic system by the energy exchange between middle temperature system and the cryogenic system.
Fig. 5 illustrate according to the one or more aspects of the present invention have air discharging and defrosting functions in the structural representation of low temperature integrated type refrigerated storage/refrigerating system.With reference to Fig. 5, of the present invention have air discharging and defrosting functions among low temperature integrated type refrigerated storage/refrigerating system and Fig. 4 in low temperature integrated type refrigerated storage/refrigerating system compare, introduce the air discharging and defrosting operating process, and can guarantee by the control to related valve the switching of cryogenic system between normal operating condition and air discharging and defrosting state in this integrated form.Particularly, integrated system shown in Figure 5 mainly comprises: middle temperature compressor, cryogenic compressor, condenser, reservoir, charge air cooler, middle temperature evaporimeter, cryogenic vaporizer and control valve 1 to 4, control valve 5 and 11, check valve 6 and 10, expansion valve 7 to 9.Wherein, the refrigerating function that the condenser of the condenser of warm system and free-standing cryogenic system has in this compatible stand alone type of condenser while, and reservoir has been replaced warm system and cryogenic system reservoir separately in the stand alone type.By combination of actions certain between the control valve 1 to 4, can realize the switching between normal operating condition and the air discharging and defrosting state, and the suction condition of cryogenic system can regulate normal operating condition and air discharging and defrosting state by control valve 5 and 11 time, reduce the suction temperature of cryogenic compressor, thereby reduced the delivery temperature of cryogenic compressor, guaranteed better the stable operation of compressor bank.
Fig. 6 show as shown in Figure 5 in the principle schematic of low temperature integrated type refrigerated storage/refrigerating system when being in normal operating conditions.Here, part shown in the dotted line is illustrated in normal when operation and does not participate in the refrigerant line that circulates among Fig. 6, and the expression of part shown in the solid line participates in the refrigerant line of circulation.Specifically, when integrated system was in normal operating condition, control valve 2 and check valve 6 were closed, and did not participate in circulating via the cold-producing medium branch road of control valve 4 to reservoir.With reference to Fig. 6, elaborate the operation principle of system when the normal operation according to the flow direction of cold-producing medium: the cold-producing medium of low-temp low-pressure respectively through in become the gas of HTHP after warm compressor and the cryogenic compressor compression, be cooled to the liquid of HTHP and follow the heat radiation process after entering condenser via control valve 1; When the liquid of this HTHP is divided into three pipelines behind check valve and reservoir, the concrete operations of these three pipelines are decomposed in the introduction of above-mentioned Fig. 4 in detail, are not repeated herein.
Fig. 7 illustrate as shown in Figure 5 in the principle schematic of low temperature integrated type refrigerated storage/refrigerating system when being in the air discharging and defrosting state.Equally, part shown in the dotted line does not participate in the refrigerant line that circulates when being illustrated in air discharging and defrosting among Fig. 7, and the expression of part shown in the solid line participates in the refrigerant line of circulation.Specifically, when integrated system was in the air discharging and defrosting state, control valve 1 and check valve 10, expansion valve 7 and 9 were all closed, and control valve 2 and check valve 6 are opened simultaneously.With reference to Fig. 7, also elaborate the operation principle of system when the air discharging and defrosting according to the flow direction of cold-producing medium: the cold-producing medium of low-temp low-pressure enters middle temperature compressor and enters the gas that becomes HTHP after the cryogenic compressor compression is processed through control valve 11, enter cryogenic vaporizer by control valve 2 and 3, then enter expansion valve 8 through check valve 6, control valve 4, reservoir, and throttling is to get back to compressor bank by middle temperature evaporimeter behind the liquids and gases two phase flow of low-temp low-pressure.In the air discharging and defrosting process, all do not relate to the use of condenser in all refrigerant lines.In order better to improve the execution efficient of air discharging and defrosting and to reduce defrosting time, be built-in with temperature sensor in the cryogenic vaporizer, can determine quickly the zero hour and the finish time of air discharging and defrosting by the Based Intelligent Control relevant parameter.After further cryogenic vaporizer being carried out again optimal design, can reduce defrosting time, guarantee that defrosting is thoroughly.
Those of ordinary skill in the art should be appreciated that the compressor of above addressing, middle temperature compressor and cryogenic compressor, is applicable to too compressor bank, middle temperature and pressure contracting unit and low temperature compression unit.Thereby having more than according to the specific embodiment of the one or more aspects of the present invention is the situation that is confined to compressor, middle temperature compressor and cryogenic compressor.
Above, describe the specific embodiment of the present invention with reference to the accompanying drawings.But those skilled in the art can understand, in the situation that without departing from the spirit and scope of the present invention, can also do various changes and replacement to the specific embodiment of the present invention.These changes and replacement all drop in claims limited range of the present invention.
Claims (11)
1. low temperature integrated type refrigerated storage/refrigerating system in a kind, it comprises: middle temperature compressor, cryogenic compressor, condenser, reservoir, intermediate heat exchanger, middle temperature evaporimeter, cryogenic vaporizer,
It is characterized in that, described system also comprises the first control valve, the second control valve, the 3rd control valve and the 4th control valve, the first control valve and the second control valve, the first check valve and the second check valve, the first expansion valve, the second expansion valve and the 3rd expansion valve, by controlling the combination of actions of described the first control valve, the second control valve, the 3rd control valve and the 4th control valve, between kind of refrigeration cycle operation and air discharging and defrosting cycling, carry out switching controls
Wherein, under kind of refrigeration cycle operation, cold-producing medium through in warm compressor and cryogenic compressor compression by being entered distribute heat behind the condenser by the first control valve, when via the second check valve by behind the reservoir, cold-producing medium is divided into three pipelines:
-in the first pipeline, cold-producing medium is successively through getting back to middle temperature compressor behind the first expansion valve, the middle temperature evaporimeter;
-in the second pipeline, cold-producing medium passes through intermediate heat exchanger, the 4th control valve, the second expansion valve, cryogenic vaporizer successively by getting back to cryogenic compressor by the 3rd control valve;
-in the 3rd pipeline, cold-producing medium is got back to middle temperature compressor afterwards, and is got back to cryogenic compressor via the first control valve successively through the 3rd expansion valve, intermediate heat exchanger after excessively cold;
Wherein, the first check valve is in parallel with the second expansion valve,
Wherein, the second control valve at one end connects the 3rd control valve, is connected to the downstream of middle temperature compressor and cryogenic compressor at the other end,
Wherein, the two ends of the second control valve are connected respectively to the upstream side of middle temperature compressor and the upstream side of cryogenic compressor,
Wherein, the 4th control valve also is connected with the upstream side of reservoir,
When described the first control valve is opened, described the second control valve is closed, described the 3rd control valve is opened into the refrigerant line of described cryogenic compressor, described the 4th control valve closes to the refrigerant line of described reservoir, and described the first expansion valve, the second expansion valve, when the 3rd expansion valve is all opened, described system carries out the kind of refrigeration cycle operation
When described the first control valve is closed, described the second control valve is opened, described the 3rd control valve is opened into the refrigerant line of described the second control valve, described the 4th control valve closes to the refrigerant line of described intermediate heat exchanger, described the first expansion valve is opened, and when described the second expansion valve and described three expansion valves were all closed, described system carried out the air discharging and defrosting operation.
2. low temperature integrated type refrigerated storage/refrigerating system in as claimed in claim 1, it is characterized in that, when described system carries out the kind of refrigeration cycle operation, by the suction temperature that described the first control valve is regulated described cryogenic compressor, reduce the delivery temperature of described cryogenic compressor.
3. low temperature integrated type refrigerated storage/refrigerating system in as claimed in claim 1, it is characterized in that, when described system carries out the air discharging and defrosting operation, by the suction temperature that described the second control valve is regulated described cryogenic compressor, reduce the delivery temperature of described cryogenic compressor.
4. low temperature integrated type refrigerated storage/refrigerating system in described such as in the claims 1 to 3 each is characterized in that described system is when carrying out kind of refrigeration cycle operation or air discharging and defrosting operation, and described middle temperature compressor and described cryogenic compressor all put into operation.
5. low temperature integrated type refrigerated storage/refrigerating system is characterized in that in as claimed in claim 1, and described cryogenic vaporizer is provided with temperature sensor, and the relevant parameter that presets described temperature sensor can be determined the zero hour and the finish time of air discharging and defrosting.
6. low temperature integrated type refrigerated storage/refrigerating system is characterized in that in as claimed in claim 1, and described middle temperature compressor can be middle temperature and pressure contracting unit, and described cryogenic compressor can be the cryogenic compressor group; Described middle temperature evaporimeter can be middle temperature evaporator bank, and described cryogenic vaporizer can be the cryogenic vaporizer group.
One kind in carry out kind of refrigeration cycle operation and air discharging and defrosting cycling in the low temperature integrated type refrigerated storage/refrigerating system changing method, low temperature integrated type refrigerated storage/refrigerating system comprises middle temperature compressor at least in described, cryogenic compressor, condenser, reservoir, intermediate heat exchanger, middle temperature evaporimeter, cryogenic vaporizer, and first control valve, the second control valve, the 3rd control valve and the 4th control valve, the first control valve and the second control valve, the first check valve and the second check valve, and first expansion valve, the second expansion valve and the 3rd expansion valve
Wherein, under kind of refrigeration cycle operation, cold-producing medium through in warm compressor and cryogenic compressor compression by being entered distribute heat behind the condenser by the first control valve, when via the second check valve by behind the reservoir, cold-producing medium is divided into three pipelines:
-in the first pipeline, cold-producing medium is successively through getting back to middle temperature compressor behind the first expansion valve, the middle temperature evaporimeter;
-in the second pipeline, cold-producing medium passes through intermediate heat exchanger, the 4th control valve, the second expansion valve, cryogenic vaporizer successively by getting back to cryogenic compressor by the 3rd control valve;
-in the 3rd pipeline, cold-producing medium is got back to middle temperature compressor afterwards, and is got back to cryogenic compressor via the first control valve successively through the 3rd expansion valve, intermediate heat exchanger after excessively cold;
Wherein, the first check valve is in parallel with the second expansion valve,
Wherein, the second control valve at one end connects the 3rd control valve, is connected to the downstream of middle temperature compressor and cryogenic compressor at the other end,
Wherein, the two ends of the second control valve are connected respectively to the upstream side of middle temperature compressor and the upstream side of cryogenic compressor,
Wherein, the 4th control valve also is connected with the upstream side of reservoir,
It is characterized in that, when described the first control valve is opened, described the second control valve is closed, described the 3rd control valve is opened into the refrigerant line of described cryogenic compressor, described the 4th control valve closes to the refrigerant line of described reservoir, and described the first expansion valve, the second expansion valve, when the 3rd expansion valve is all opened, described system carries out the kind of refrigeration cycle operation
When described the first control valve is closed, described the second control valve is opened, described the 3rd control valve is opened into the refrigerant line of described the second control valve, described the 4th control valve closes to the refrigerant line of described intermediate heat exchanger, described the first expansion valve is opened, and when described the second expansion valve and described three expansion valves were all closed, described system carried out the air discharging and defrosting operation.
8. changing method as claimed in claim 7 is characterized in that, when described system carries out the kind of refrigeration cycle operation, by the suction temperature that described the first control valve is regulated described cryogenic compressor, reduces the delivery temperature of described cryogenic compressor.
9. changing method as claimed in claim 7 is characterized in that, when described system carries out the air discharging and defrosting operation, by the suction temperature that described the second control valve is regulated described cryogenic compressor, reduces the delivery temperature of described cryogenic compressor.
10. changing method as claimed in claim 7 is characterized in that, mounting temperature sensor in described cryogenic vaporizer presets the relevant parameter of described temperature sensor to determine the zero hour and the finish time of air discharging and defrosting.
11. changing method as claimed in claim 7 is characterized in that, described middle temperature compressor can be middle temperature and pressure contracting unit, and described cryogenic compressor can be the cryogenic compressor group; Described middle temperature evaporimeter can be middle temperature evaporator bank, and described cryogenic vaporizer can be the cryogenic vaporizer group.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101813254A CN101413745B (en) | 2007-10-17 | 2007-10-17 | Middle and low temperature integrated type refrigerated storage / refrigerating system with air discharging and defrosting functions |
| US12/738,300 US20100205984A1 (en) | 2007-10-17 | 2008-10-17 | Integrated Refrigerating/Freezing System and Defrost Method |
| EP08840007.2A EP2198223A4 (en) | 2007-10-17 | 2008-10-17 | Integrated refrigerating/freezing system and defrost method |
| PCT/US2008/080298 WO2009052369A2 (en) | 2007-10-17 | 2008-10-17 | Integrated refrigerating/freezing system and defrost method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101813254A CN101413745B (en) | 2007-10-17 | 2007-10-17 | Middle and low temperature integrated type refrigerated storage / refrigerating system with air discharging and defrosting functions |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101413745A CN101413745A (en) | 2009-04-22 |
| CN101413745B true CN101413745B (en) | 2013-02-06 |
Family
ID=40568078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101813254A Expired - Fee Related CN101413745B (en) | 2007-10-17 | 2007-10-17 | Middle and low temperature integrated type refrigerated storage / refrigerating system with air discharging and defrosting functions |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20100205984A1 (en) |
| EP (1) | EP2198223A4 (en) |
| CN (1) | CN101413745B (en) |
| WO (1) | WO2009052369A2 (en) |
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| US9151521B2 (en) | 2008-04-22 | 2015-10-06 | Hill Phoenix, Inc. | Free cooling cascade arrangement for refrigeration system |
| US8631666B2 (en) | 2008-08-07 | 2014-01-21 | Hill Phoenix, Inc. | Modular CO2 refrigeration system |
| US9541311B2 (en) | 2010-11-17 | 2017-01-10 | Hill Phoenix, Inc. | Cascade refrigeration system with modular ammonia chiller units |
| US9657977B2 (en) | 2010-11-17 | 2017-05-23 | Hill Phoenix, Inc. | Cascade refrigeration system with modular ammonia chiller units |
| US9664424B2 (en) | 2010-11-17 | 2017-05-30 | Hill Phoenix, Inc. | Cascade refrigeration system with modular ammonia chiller units |
| EP2718641B1 (en) | 2011-06-13 | 2019-01-09 | ARESCO Technologies, LLC | Refrigeration system and methods for refrigeration |
| DK177329B1 (en) | 2011-06-16 | 2013-01-14 | Advansor As | Refrigeration system |
| US9310121B2 (en) | 2011-10-19 | 2016-04-12 | Thermo Fisher Scientific (Asheville) Llc | High performance refrigerator having sacrificial evaporator |
| US9285153B2 (en) | 2011-10-19 | 2016-03-15 | Thermo Fisher Scientific (Asheville) Llc | High performance refrigerator having passive sublimation defrost of evaporator |
| MX359679B (en) | 2011-11-21 | 2018-10-05 | Hill Phoenix Inc | C02 refrigeration system with hot gas defrost. |
| CN105674622A (en) * | 2016-03-31 | 2016-06-15 | 天津众石睿哲科技有限责任公司 | Carbon dioxide heat pump system with hydraulic filling type liquid storage evaporator |
| US10767906B2 (en) | 2017-03-02 | 2020-09-08 | Heatcraft Refrigeration Products Llc | Hot gas defrost in a cooling system |
| US11022382B2 (en) | 2018-03-08 | 2021-06-01 | Johnson Controls Technology Company | System and method for heat exchanger of an HVAC and R system |
| CN108378128B (en) * | 2018-04-20 | 2024-03-19 | 浙江青风环境股份有限公司 | Multistage temperature control and humidity control cooling system |
| CN108716785B (en) * | 2018-07-20 | 2023-09-26 | 天津商业大学 | Primary throttling intermediate full cooling refrigeration system with intermediate temperature evaporator |
| EP4033178B1 (en) * | 2019-09-30 | 2024-05-29 | Daikin Industries, Ltd. | Refrigeration device |
| CN113375354B (en) * | 2020-02-25 | 2024-06-11 | 浙江盾安人工环境股份有限公司 | Refrigerating system and control method thereof |
| CN112189919A (en) * | 2020-10-14 | 2021-01-08 | 湖南小红服装有限公司 | Medical protective clothing convenient to use |
| CN112963978B (en) * | 2021-02-26 | 2022-06-17 | 珠海格力电器股份有限公司 | Air conditioner defrosting structure, defrosting method and device thereof and air conditioner |
| CN112944754A (en) * | 2021-04-01 | 2021-06-11 | 刘兵兵 | Constant-temperature refrigeration house system with hot fluorine automatic defrosting function |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2198223A4 (en) | 2014-09-03 |
| US20100205984A1 (en) | 2010-08-19 |
| EP2198223A2 (en) | 2010-06-23 |
| CN101413745A (en) | 2009-04-22 |
| WO2009052369A3 (en) | 2009-07-16 |
| WO2009052369A2 (en) | 2009-04-23 |
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