CN103335440A - Secondary throttling middle complete cooling double-working-condition refrigeration system - Google Patents
Secondary throttling middle complete cooling double-working-condition refrigeration system Download PDFInfo
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- CN103335440A CN103335440A CN2013102783942A CN201310278394A CN103335440A CN 103335440 A CN103335440 A CN 103335440A CN 2013102783942 A CN2013102783942 A CN 2013102783942A CN 201310278394 A CN201310278394 A CN 201310278394A CN 103335440 A CN103335440 A CN 103335440A
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Abstract
The invention discloses a secondary throttling middle complete cooling double-working-condition refrigeration system. The secondary throttling middle complete cooling double-working-condition refrigeration system can achieve variable flow single-stage steam compression circulation, and can also achieve double-stage compression circulation of variable flow secondary throttling middle complete cooling. The secondary throttling middle complete cooling double-working-condition refrigeration system comprises a plurality of sets of variable flow compression condenser units which are connected among a high-temperature air suction pipeline, a low-temperature air suction pipeline and a middle-pressure liquid supply pipeline in parallel, wherein each variable flow compression condenser unit is composed of a low-pressure constant flow compressor, a low-pressure variable flow compressor, a high-pressure variable flow compressor, a first one-way valve, a second one-way valve, a third one-way valve, a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a condenser, an intercooler and a throttling valve. The variable flow compression condenser units can suck air from the high-temperature air suction pipeline to achieve single-stage compression refrigeration circulation to supply liquid to the middle-pressure liquid supply pipeline, and can also suck air from the low-temperature air suction pipeline to achieve secondary throttling middle complete cooling double-stage compression circulation to supply liquid to the middle-pressure liquid supply pipeline.
Description
Technical field
The present invention relates to refrigeration technology field, particularly relate to and a kind ofly undertaken cooling off duplexing condition double-stage compressive refrigerating system fully in the middle of the second throttle that refrigerating capacity regulates by changing refrigerant flow.
Background technology
The existing double-stage compressive refrigerating system that is used for the cold storage freezer adopts the start-stop of temperature control compressor usually, and when temperature of ice house reached temperature controller temperature is set, refrigeration system quit work; When temperature rose to temperature controller temperature upper limit is set, refrigeration system was opened.There is a contradiction in such system, when the needs startup-shutdown temperature difference is bigger, can cause the food dehydration drying loss that store food is brought owing to the freezing rate difference in the cold storage freezer, and food quality descends; When the needs startup-shutdown temperature difference was smaller, refrigeration system was opened frequently, and not only power consumption increases, and the service life that can reduce refrigeration system.Existing double-stage compressive refrigerating system high and low pressure volumetric ratio is fixing 1:3 or 1:2 in addition, and for the refrigeration system that condensation temperature constantly changes, because the high and low pressure volumetric ratio is non-adjustable, refrigeration system is not to work under optimum.
Realize the control of refrigerating capacity by the multi-connected air conditioning system that many Condensing units and Duo Tai indoor evaporator are formed by changing refrigerant flow, system's flexible operation is easy to control, is widely used in field of air conditioning.But existing multi-gang air conditioner all is single-stage compression refrigeration system, only is applicable to field of air conditioning, is not suitable for the lower cold storage freezer system of temperature.
(suction temperature is lower for the cold storage freezer; usually need the twin-stage compressibility) and (suction temperature is higher to refrigerate freezer; usually need the one-stage steam compression system) system in parallel; usually need single, double level vapor compression system is disposed separately; system's one-time investment is big, and the refrigerating capacity adjusting relies on startup-shutdown to realize fully.
Summary of the invention
The objective of the invention is to regulate the technological deficiency that relies on startup-shutdown to realize fully at the refrigerating capacity that exists in the prior art; and the parallel connection of a kind of many group unsteady flow amount Condensing units is provided; both can realize the one-stage steam compressed circulation of unsteady flow amount, can realize the middle refrigeration system of the twin-stage compression cycle of cooling fully of unsteady flow amount second throttle again.
For realizing that the technical scheme that purpose of the present invention adopts is:
Cool off duplexing condition refrigeration system fully in the middle of a kind of second throttle, it is characterized in that, comprise the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line, low temperature suction line and the middle pressure feed flow pipeline; Every group of described unsteady flow amount Condensing units is made up of low pressure constant flow compressor, low pressure unsteady flow capacity compressor, high voltage variable flow compressor, first check valve, second check valve, the 3rd check valve, first valve, second valve, the 3rd valve, the 4th valve, the 5th valve, condenser, intercooler and choke valve; Described first valve inlet in every group of described unsteady flow amount Condensing units is connected with described high temperature suction line, and described second valve inlet is connected with described low temperature suction line, the liquid outlet of described intercooler with described in press the feed flow pipeline to be connected; Described first valve export and described second valve export respectively with described low pressure constant flow compressor air suction mouth, described low pressure unsteady flow capacity compressor air entry is connected with described the 4th valve inlet, described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure unsteady flow capacity compressor exhaust outlet is connected with described second check valve inlet, be connected with import below the intercooler liquid level with described the 5th valve inlet respectively after the outlet of described first check valve and described second check valve outlet parallel connection, described intercooler gas vent is connected with described the 3rd valve inlet, be connected with described high voltage variable flow compressor air entry after described the 3rd valve export and described the 4th valve export parallel connection, described high voltage variable flow compressor exhaust outlet is connected with described the 3rd check valve inlet, be connected with described condenser inlet after the outlet of described the 3rd check valve and described the 5th valve export parallel connection, described condensator outlet is connected with described intercooler import through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve and the 5th valve or close, both can to described, press feed flow pipeline feed flow from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle, and can in the middle of the air-breathing realization second throttle of described low temperature suction line, cool off twin-stage compression refrigeration circulation again fully and to described, press feed flow pipeline feed flow.
Described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor.
Described low pressure unsteady flow capacity compressor and described high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, unsteady flow amount mode can be by regulating to the frequency conversion of alternating current generator or by the time variant voltage to direct current generator, also can adopting cold-producing medium unloading and load mode to realize the Flow-rate adjustment of cold-producing medium.
Described condenser is air-cooled condenser, water-cooled condenser, evaporative condenser or other pattern condenser.
Described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
Described intercooler is plate type heat exchanger or double pipe heat exchanger.
Compared with prior art, the invention has the beneficial effects as follows:
1, energy-conservation: refrigeration system of the present invention is made up of unsteady flow amount Condensing units parallel with one another; every group of unsteady flow amount Condensing units comprises low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor; the refrigerant flow that is input to cold storage freezer and refrigeration freezer can be regulated according to the load needs; overcome refrigerating capacity and regulated the technological deficiency that relies on startup-shutdown to realize fully, refrigeration system can frequently not opened.
2, temperature of ice house is constant: owing to can adjust the refrigerant flow of refrigeration system, system can adjust refrigerant flow automatically according to the load variations of cold storage freezer, refrigeration system can be with lower refrigerant flow work after reaching design temperature, keep the temperature of cold storage freezer and refrigeration freezer, avoided the fluctuation of cool house internal temperature, reduced effectively because the dehydration drying loss of the food that temperature fluctuation brings.
3, one-time investment is few: the unsteady flow amount Condensing units in the refrigeration system of the present invention both can from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to pressure feed flow pipeline feed flow, can in the middle of the air-breathing realization second throttle of described low temperature suction line, cool off fully again twin-stage compression refrigeration circulation to pressure feed flow pipeline feed flow.Unsteady flow amount Condensing units in parallel is nonintervention mutually at work, and all can realize the operation of unsteady flow amount, and a tractor serves several purposes has reduced one-time investment.
4, unit can be realized optimum condition: refrigeration system of the present invention is made up of unsteady flow amount Condensing units parallel with one another, every group of unsteady flow amount Condensing units comprises low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor, overcome in the prior art the fixedly shortcoming of high and low pressure volumetric ratio, realized regulating of volumetric ratio, no matter how operating mode changes, refrigeration system always is in optimum state work, and energy consumption is low.
5, modularization: high voltage variable flow compressor and low pressure unsteady flow capacity compressor can adopt the compressor of same rated input power, are conducive to the adjustment of system and are convenient to maintenance and maintenance, the modularization of easier realization of while system.
Description of drawings
Figure 1 shows that the middle schematic diagram that cools off duplexing condition refrigeration system fully of second throttle of the present invention.
Among the figure: 1. high temperature suction line, 2. low temperature suction line is pressed the feed flow pipeline in 3., 4. low pressure constant flow compressor, 5. low pressure unsteady flow capacity compressor, 6. high voltage variable flow compressor, 7-1. first check valve, 7-2. second check valve, 7-3. the 3rd check valve, 8-1. first valve, 8-2. second valve, 8-3. the 3rd valve, 8-4. the 4th valve, 8-5. the 5th valve, 9. condenser, 10. intercooler, 11. choke valves.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Cool off duplexing condition refrigeration system schematic diagram fully in the middle of Figure 1 shows that second throttle of the present invention, comprise the many groups unsteady flow amount Condensing units that is connected in parallel between described high temperature suction line 1, described low temperature suction line 2 and the middle pressure feed flow pipeline 3.Every group of described unsteady flow amount Condensing units comprises low pressure constant flow compressor 4, low pressure unsteady flow capacity compressor 5, high voltage variable flow compressor 6, the first check valve 7-1, the second check valve 7-2, the 3rd check valve 7-3, the first valve 8-1, the second valve 8-2, the 3rd valve 8-3, the 4th valve 8-4, the 5th valve 8-5, condenser 9, intercooler 10 and choke valve 11.The described first valve 8-1 import in every group of described unsteady flow amount Condensing units is connected with described high temperature suction line 1, the described second valve 8-2 import is connected with described low temperature suction line 2, described intercooler 10 liquid outlets are connected with the described middle feed flow pipeline 3 of pressing, described first valve 8-1 outlet and the described second valve 8-2 export respectively and described low pressure constant flow compressor 4 air entries, described low pressure unsteady flow capacity compressor 5 air entries are connected with described the 4th valve 8-4 import, described low pressure constant flow compressor 4 exhaust outlets are connected with the described first check valve 7-1 import, described low pressure unsteady flow capacity compressor 5 exhaust outlets are connected with the described second check valve 7-2 import, be connected with import below intercooler 10 liquid levels with described the 5th valve 8-5 import respectively after described first check valve 7-1 outlet and the described second check valve 7-2 outlet parallel connection, described intercooler 10 gas vents are connected with described the 3rd valve 8-3 import, described the 3rd valve 8-3 outlet is connected with described high voltage variable flow compressor 6 air entries with described the 4th valve 8-4 outlet back in parallel, described high voltage variable flow compressor 6 exhaust outlets are connected with described the 3rd check valve 7-3 import, described the 3rd check valve 7-3 outlet is connected with described condenser 9 imports with described the 5th valve 8-5 outlet back in parallel, and described condenser 9 outlets are connected with described intercooler 10 imports through described choke valve 11.
Cool off fully in the middle of the second throttle of present embodiment in the duplexing condition refrigeration system unsteady flow amount Condensing units both can from described high temperature suction line 1 air-breathing realization single stage compress kind of refrigeration cycle to pressure feed flow pipeline 3 feed flows, can in the middle of described low temperature suction line 2 air-breathing realization second throttles, cool off fully again twin-stage compression refrigeration circulation to pressure feed flow pipeline 3 feed flows.Unsteady flow amount Condensing units in parallel is nonintervention mutually at work, and all can realize the operation of unsteady flow amount.
1, from high temperature suction line 1 air-breathing realization single stage compress kind of refrigeration cycle to pressure feed flow pipeline 3 feed flows:
The second valve 8-2 and the 3rd valve 8-3 close in the unsteady flow amount Condensing units, and the first valve 8-1, the 4th valve 8-4 and the 5th valve 8-5 open.The low-pressure refrigerant vapor of getting back to unsteady flow amount Condensing units from the refrigeration freezer enters low pressure constant flow compressor 4, low pressure unsteady flow capacity compressor 5 and high voltage variable flow compressor 6 respectively through high temperature suction line 1 and compresses, high-pressure refrigerant vapor after the compression is condensed into highly pressurised liquid through the first check valve 7-1, the second check valve 7-2 and the 3rd check valve 7-3 respectively to condenser 9, carrying out a throttling at choke valve 11 is to press during the saturated gas-liquid two phase refrigerant of middle pressure enters by intercooler 10 in the feed flow pipeline 3 to refrigeration freezer feed flow.
2, from the air-breathing realization twin-stage compression refrigerations circulation of low temperature suction line 2 to pressure feed flow pipeline 3 feed flows:
The first valve 8-1, the 4th valve 8-4 and the 5th valve 8-5 close in the unsteady flow amount Condensing units, and the second valve 8-2 and the 3rd valve 8-3 open.The low-pressure refrigerant vapor of getting back to unsteady flow amount Condensing units from the cold storage freezer enters respectively through low temperature suction line 2 carries out the one-level compression low pressure constant flow compressor 4 and the low pressure unsteady flow capacity compressor 5, middle pressure superheated vapor cold-producing medium after the compression enters the liquid of intercooler 10 from middle cooler 10 liquid levels below import through the first check valve 7-1 and the second check valve 7-2 respectively, by liquid cools to saturation state, from middle cooler 10 gas vents come out pressure saturated vapor cold-producing medium enter and carry out second level compression in the high voltage variable flow compressor 6, high pressure superheater vaporous cryogen after the compression is condensed into high pressure liquid refrigerant through condenser 9, throttling is to enter in the intercooler 10 after the saturated gas-liquid two phase refrigerant of middle pressure in choke valve 11, in press the saturated vapor cold-producing medium to participate in second level compression, middle pressure saturated liquid cold-producing medium then through in press feed flow pipeline 3 to cold storage freezer feed flow.
In the single stage compress kind of refrigeration cycle of said system, satisfy under the different load condition control to refrigerant flow in the single stage compress kind of refrigeration cycle by the combination of low pressure constant flow compressor 4, low pressure unsteady flow capacity compressor 5, high voltage variable flow compressor 6.
In the twin-stage compression refrigeration circulation of said system, when cold storage freezer load hour, low pressure unsteady flow capacity compressor 5 is worked simultaneously with high voltage variable flow compressor 6, realizes the best high and low pressure volumetric ratio of system by the refrigerant flow of adjusting high voltage variable flow compressor 6, low pressure unsteady flow capacity compressor 5; When cold storage freezer load is big, low pressure constant flow compressor 4, low pressure unsteady flow capacity compressor 5 and high voltage variable flow compressor 6 are worked simultaneously, by adjusting the refrigerant flow of low pressure unsteady flow capacity compressor 5 and high voltage variable flow compressor 6, the best high and low pressure volumetric ratio of realization system.System can carry out the adjusting of refrigerant flow in the twin-stage compression refrigeration circulation according to the load variations of cold storage freezer.
The effect of the first check valve 6-1, the second check valve 6-2 and the 3rd check valve 6-3 is the backflow when preventing that compressor from not working in above-described embodiment.
Low pressure constant flow compressor of the present invention is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, or other pattern compressor.Described low pressure unsteady flow capacity compressor and described high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, or other pattern compressor, unsteady flow amount mode can be by regulating to the frequency conversion of alternating current generator or by the time variant voltage to direct current generator, also can adopting cold-producing medium unloading and load mode to realize the Flow-rate adjustment of cold-producing medium.Described condenser is air-cooled condenser, water-cooled condenser, evaporative condenser or other pattern condenser.Described choke valve is any in electric expansion valve, heating power expansion valve, capillary or the orifice plate throttling, but also can be the throttling arrangement of other step-down power.Described intercooler can be plate type heat exchanger, double pipe heat exchanger or other pattern heat exchanger.
Valve of the present invention can be that manually-operated gate also can be electrically operated valve, and also available triple valve or cross valve replace.
Cool off duplexing condition refrigeration system in the middle of the second throttle of the present invention fully when concrete the utilization, high pressure compressor and low pressure compressor can adopt the compressor of same rated input power, be conducive to the adjustment of system and be convenient to maintenance and maintenance, the modularization of easier realization of while system.
The above only is preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. cool off duplexing condition refrigeration system fully in the middle of a second throttle, it is characterized in that, comprise the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line, low temperature suction line and the middle pressure feed flow pipeline; Every group of described unsteady flow amount Condensing units is made up of low pressure constant flow compressor, low pressure unsteady flow capacity compressor, high voltage variable flow compressor, first check valve, second check valve, the 3rd check valve, first valve, second valve, the 3rd valve, the 4th valve, the 5th valve, condenser, intercooler and choke valve; Described first valve inlet in every group of described unsteady flow amount Condensing units is connected with described high temperature suction line, and described second valve inlet is connected with described low temperature suction line, the liquid outlet of described intercooler with described in press the feed flow pipeline to be connected; Described first valve export and described second valve export respectively with described low pressure constant flow compressor air suction mouth, described low pressure unsteady flow capacity compressor air entry is connected with described the 4th valve inlet, described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure unsteady flow capacity compressor exhaust outlet is connected with described second check valve inlet, be connected with import below the intercooler liquid level with described the 5th valve inlet respectively after the outlet of described first check valve and described second check valve outlet parallel connection, described intercooler gas vent is connected with described the 3rd valve inlet, be connected with described high voltage variable flow compressor air entry after described the 3rd valve export and described the 4th valve export parallel connection, described high voltage variable flow compressor exhaust outlet is connected with described the 3rd check valve inlet, be connected with described condenser inlet after the outlet of described the 3rd check valve and described the 5th valve export parallel connection, described condensator outlet is connected with described intercooler import through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve and the 5th valve or close, both can to described, press feed flow pipeline feed flow from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle, and can in the middle of the air-breathing realization second throttle of described low temperature suction line, cool off twin-stage compression refrigeration circulation again fully and to described, press feed flow pipeline feed flow.
2. cool off duplexing condition refrigeration system fully in the middle of the second throttle according to claim 1, it is characterized in that described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor.
3. cool off duplexing condition refrigeration system fully in the middle of the second throttle according to claim 1, it is characterized in that, described low pressure unsteady flow capacity compressor and described high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, unsteady flow amount mode is for by regulating to the frequency conversion of alternating current generator or by the time variant voltage to direct current generator, or adopts the Flow-rate adjustment of cold-producing medium unloading and load mode realization cold-producing medium.
4. cool off duplexing condition refrigeration system fully in the middle of the second throttle according to claim 1, it is characterized in that described condenser is air-cooled condenser, water-cooled condenser or evaporative condenser.
5. cool off duplexing condition refrigeration system fully in the middle of the second throttle according to claim 1, it is characterized in that described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
6. cool off duplexing condition refrigeration system fully in the middle of the second throttle according to claim 1, it is characterized in that described intercooler is plate type heat exchanger or double pipe heat exchanger.
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| CN108253653A (en) * | 2018-03-21 | 2018-07-06 | 天津商业大学 | Variable-flow single stage compress recycles the heat pump system with autocascade cycle |
| CN108332443A (en) * | 2018-03-21 | 2018-07-27 | 天津商业大学 | The refrigeration system of variable-flow single stage compress cycle and cascade cycle can be achieved |
| CN108716785A (en) * | 2018-07-20 | 2018-10-30 | 天津商业大学 | The intermediate completely cooling refrigeration system of primary throttling with medium temperature evaporator |
| CN108759139A (en) * | 2018-07-20 | 2018-11-06 | 天津商业大学 | The intermediate not exclusively cooling refrigeration system of primary throttling with medium temperature evaporator |
| US11131491B1 (en) | 2020-08-07 | 2021-09-28 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
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| CN108759139A (en) * | 2018-07-20 | 2018-11-06 | 天津商业大学 | The intermediate not exclusively cooling refrigeration system of primary throttling with medium temperature evaporator |
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| US11131491B1 (en) | 2020-08-07 | 2021-09-28 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
| US11585581B2 (en) | 2020-08-07 | 2023-02-21 | Emerson Climate Technologies, Inc. | Systems and methods for multi-stage operation of a compressor |
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| CN103335440B (en) | 2015-03-11 |
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