CN103335437A - One-stage throttling incomplete-inter-cooling double-working-condition refrigerating system - Google Patents
One-stage throttling incomplete-inter-cooling double-working-condition refrigerating system Download PDFInfo
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- CN103335437A CN103335437A CN2013102785115A CN201310278511A CN103335437A CN 103335437 A CN103335437 A CN 103335437A CN 2013102785115 A CN2013102785115 A CN 2013102785115A CN 201310278511 A CN201310278511 A CN 201310278511A CN 103335437 A CN103335437 A CN 103335437A
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Abstract
The invention discloses a one-stage throttling incomplete-inter-cooling double-working-condition refrigerating system capable of achieving variable-flow single-stage vapor compression cycle and variable-flow one-stage throttling incomplete inter-cooling. The one-stage throttling incomplete-inter-cooling double-working-condition refrigerating system comprises a plurality of sets of variable-flow compression condensing units which are connected among a high-temperature air suction pipeline, a low-temperature air suction pipeline and a high-pressure liquid supply pipeline in parallel. Each set of variable-flow compression condensing 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 sixth valve, a condenser, an intercooler and a throttling valve. Through opening or closing of each valve, air can be sucked by the high-temperature air suction pipeline so that single-stage compression refrigeration cycle can supply liquid to the high-pressure liquid supply pipeline, and air can also be sucked by the low-temperature air suction pipeline so that double-stage compression refrigeration cycle can supply liquid to the high-pressure liquid supply pipeline.
Description
Technical field
The present invention relates to refrigeration technology field, particularly relate to a kind of by changing the duplexing condition double-stage compressive refrigerating system of the middle not exclusively cooling of a throttling that refrigerant flow carries out the refrigerating capacity adjusting.
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, the energy consumption height.
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 not exclusively refrigeration system of the twin-stage compression cycle of cooling of a throttling of unsteady flow amount again.
For realizing that the technical scheme that purpose of the present invention adopts is:
Not exclusively cool off duplexing condition refrigeration system in the middle of a kind of throttling, 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 high 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, the 6th 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, and described intercooler pipe side outlet is connected with described high pressure feed flow pipeline; 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, the outlet of described first check valve and described second check valve export in parallel after respectively with described the 3rd valve inlet, described the 5th valve inlet is connected with described intercooler shell-side outlet, 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, side-entrance is connected described condensator outlet with described intercooler pipe with described the 6th valve inlet respectively, and described the 6th valve export is connected with described intercooler shell-side inlet through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure feed flow pipeline feed flow.
Throttle refrigeration system after not exclusively the duplexing condition of cooling is cooled off in the middle of the throttling comprises the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line, low temperature suction line and the high 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, the 6th 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, described second valve inlet is connected with described low temperature suction line, and described intercooler pipe side outlet is connected with the 6th valve inlet with described high pressure feed flow pipeline respectively; 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, the outlet of described first check valve and described second check valve export in parallel after respectively with described the 3rd valve inlet, described the 5th valve inlet is connected with described intercooler shell-side outlet, 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 the side-entrance of described intercooler pipe, and described the 6th valve export is connected with described intercooler shell-side inlet through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure 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 or evaporative condenser; Described intercooler is plate type heat exchanger or double pipe heat exchanger.
Described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
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 the cold storage 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, 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 not exclusively be cooled off twin-stage compression refrigeration circulation to high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to high pressure feed flow pipeline feed flow in the middle of a throttling of the air-breathing realization of described low temperature suction line.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
Not exclusively cool off the preceding throttle refrigeration system schematic diagram of duplexing condition cooling in the middle of Figure 1 shows that a throttling of the present invention.
Not exclusively cool off duplexing condition cooling back throttle refrigeration system schematic diagram in the middle of Figure 2 shows that a throttling of the present invention.
Among the figure: 1. high temperature suction line, 2. low temperature suction line, 3. high pressure feed flow pipeline, 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, 8-6. the 6th 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.
In the middle of throttling of the present invention not exclusively the duplexing condition refrigeration system of cooling be divided in the middle of the throttling before the not exclusively duplexing condition cooling of cooling in the middle of the throttle refrigeration system and a throttling the not exclusively duplexing condition cooling of cooling back throttle refrigeration system according to the difference of throttle position.
Embodiment 1
Not exclusively cool off the preceding throttle refrigeration system schematic diagram of duplexing condition cooling in the middle of Figure 1 shows that a throttling of the present invention, comprise and be connected in parallel on high temperature suction line 1, many groups unsteady flow amount Condensing units between low temperature suction line 2 and the high pressure feed flow pipeline 3, every group of described unsteady flow amount Condensing units is by 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, the 6th valve 8-6, condenser 9, intercooler 10 and choke valve 11 are formed.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 pipe side outlets are connected with described high pressure feed flow pipeline 3, described first valve 8-1 outlet and described second valve 8-2 outlet respectively with 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, described first check valve 7-1 outlet and the described second check valve 7-2 export in parallel after respectively with described the 3rd valve 8-3 import, described the 5th valve 8-5 import is connected with described intercooler 10 shell-sides outlet, 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, described condenser 9 outlets are connected with described intercooler 10 pipe side-entrances with described the 6th valve 8-6 import respectively, and described the 6th valve 8-6 outlet is connected with described intercooler 10 shell-side inlet through described choke valve 11.Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure feed flow pipeline feed flow.
The unsteady flow amount Condensing units of not exclusively cooling off in the middle of the throttling of present embodiment 1 in the preceding throttle refrigeration system of duplexing condition cooling both can not exclusively be cooled off twin-stage compression refrigeration circulation to high pressure feed flow pipeline 3 feed flows again from described high temperature suction line 1 air-breathing realization single stage compress kind of refrigeration cycle to high pressure feed flow pipeline 3 feed flows in the middle of a throttling of described low temperature suction line 2 air-breathing realizations.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 high pressure feed flow pipeline 3 feed flows:
The second valve 8-2, the 3rd valve 8-3 and the 6th valve 8-6 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, enter in the high pressure feed flow pipeline 3 to refrigeration freezer feed flow through the pipe side import and export of intercooler 10.
2, from the 2 air-breathing realization twin-stage compression refrigeration circulations of low temperature suction line to high 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, the 3rd valve 8-3 and the 6th valve 8-6 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 respectively through the first check valve 7-1 and the second check valve 7-2 with export out from middle cooler 10 shell-sides pressure saturated vapor refrigerant mixed be that middle pressure superheated vapor cold-producing medium enters and carries 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, condensed high pressure liquid refrigerant is divided into two parts, to be the saturated gas-liquid two phase refrigerant of middle pressure enter in the intercooler 10 cool stream by intercooler 10 shell-side inlet to part high pressure liquid refrigerant manages side-entrance to the high pressure liquid refrigerant of managing side outlet in intercooler 10 through choke valve 11 throttlings, another part high pressure liquid refrigerant is entered by intercooler 10 pipe side-entrances and is cooled to the high-pressure sub-cooled liquid cold-producing medium in the intercooler 10, and the high-pressure sub-cooled liquid cold-producing medium comes out through high pressure feed flow pipeline 3 to cold storage freezer feed flow from middle cooler 10 pipe side outlets.
Not exclusively cool off duplexing condition cooling back throttle refrigeration system schematic diagram in the middle of Figure 2 shows that a throttling of the present invention, comprise the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line 1, low temperature suction line 2 and the high 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, the 6th valve 8-6, 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, and described intercooler 10 pipe side outlets are connected with described high pressure feed flow pipeline 3 with described the 6th valve 8-6 import respectively.Described first valve 8-1 outlet and described second valve 8-2 outlet respectively with 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, described first check valve 7-1 outlet and the described second check valve 7-2 export in parallel after respectively with described the 3rd valve 8-3 import, described the 5th valve 8-5 import is connected with described intercooler 10 shell-sides outlet, 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, described condenser 9 outlets are connected with described intercooler 10 pipe side-entrances, and described the 6th valve 8-6 outlet is connected with described intercooler 10 shell-side inlet through described choke valve 11.Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure feed flow pipeline feed flow.
Unsteady flow amount Condensing units in the throttle refrigeration system of the duplexing condition cooling of the middle not exclusively cooling of a throttling of present embodiment 2 back both can circulate to high pressure feed flow pipeline 3 feed flows from described low temperature suction line 2 air-breathing realization twin-stage compression refrigerations again from described high temperature suction line 1 air-breathing realization single stage compress kind of refrigeration cycle to high 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 high pressure feed flow pipeline 3 feed flows:
The second valve 8-2, the 3rd valve 8-3 and the 6th valve 8-6 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, enter in the high pressure feed flow pipeline 3 to refrigeration freezer feed flow through the pipe side import and export of intercooler 10.
2, from the 2 air-breathing realization twin-stage compression refrigeration circulations of low temperature suction line to high 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, the 3rd valve 8-3 and the 6th valve 8-6 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 respectively through the first check valve 7-1 and the second check valve 7-2 with export out from middle cooler 10 shell-sides pressure saturated vapor refrigerant mixed be that middle pressure superheated vapor cold-producing medium enters and carries 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, condensed high pressure liquid refrigerant is entered by intercooler 10 pipe side-entrances and is cooled to the high-pressure sub-cooled liquid cold-producing medium in the intercooler 10, the high-pressure sub-cooled liquid cold-producing medium comes out to be divided into two parts from middle cooler 10 pipe side outlets, to be the saturated gas-liquid two phase refrigerant of middle pressure enter in the intercooler 10 cool stream by intercooler 10 shell-side inlet to part high-pressure sub-cooled liquid cold-producing medium manages side-entrance to the high pressure liquid refrigerant of managing side outlet in intercooler 10 through choke valve 11 throttlings, another part high-pressure sub-cooled liquid cold-producing medium through high pressure feed flow pipeline 3 to cold storage freezer feed flow.
In the single stage compress kind of refrigeration cycle of above-described embodiment 1 and embodiment 2, 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 above-described embodiment 1 and embodiment 2, 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 among above-described embodiment 1 and the embodiment 2.
Among above-described embodiment 1 and the embodiment 2: described low pressure constant flow compressor be screw compressor, rotor compressor, helical-lobe compressor, piston compressor mid point any, 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.
Not exclusively cool off duplexing condition refrigeration system in the middle of the throttling of the present invention when concrete the utilization, high voltage variable flow compressor and low pressure unsteady flow capacity 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 (10)
1. one kind is once not exclusively cooled off duplexing condition refrigeration system in the middle of the throttling, it is characterized in that, comprises the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line, low temperature suction line and the high 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, the 6th 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, and described intercooler pipe side outlet is connected with described high pressure feed flow pipeline; 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, the outlet of described first check valve and described second check valve export in parallel after respectively with described the 3rd valve inlet, described the 5th valve inlet is connected with described intercooler shell-side outlet, 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, side-entrance is connected described condensator outlet with described intercooler pipe with described the 6th valve inlet respectively, and described the 6th valve export is connected with described intercooler shell-side inlet through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure feed flow pipeline feed flow.
2. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling 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. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling 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 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. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling according to claim 1, it is characterized in that described condenser is air-cooled condenser, water-cooled condenser or evaporative condenser; Described intercooler is plate type heat exchanger or double pipe heat exchanger.
5. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling 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. throttle refrigeration system after not exclusively the duplexing condition of cooling is cooled off in the middle of the throttling is characterized in that, comprises the many groups unsteady flow amount Condensing units that is connected in parallel between high temperature suction line, low temperature suction line and the high 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, the 6th 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, described second valve inlet is connected with described low temperature suction line, and described intercooler pipe side outlet is connected with the 6th valve inlet with described high pressure feed flow pipeline respectively; 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, the outlet of described first check valve and described second check valve export in parallel after respectively with described the 3rd valve inlet, described the 5th valve inlet is connected with described intercooler shell-side outlet, 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 the side-entrance of described intercooler pipe, and described the 6th valve export is connected with described intercooler shell-side inlet through described choke valve; Unlatching by controlling described first valve, second valve, the 3rd valve, the 4th valve, the 5th valve and the 6th valve or close, both can in the middle of a throttling of the air-breathing realization of described low temperature suction line, not exclusively cool off twin-stage compression refrigeration circulation to described high pressure feed flow pipeline feed flow again from the air-breathing realization single stage compress of described high temperature suction line kind of refrigeration cycle to described high pressure feed flow pipeline feed flow.
7. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling according to claim 6, it is characterized in that described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor.
8. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling according to claim 6, 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 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.
9. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling according to claim 6, it is characterized in that described condenser is air-cooled condenser, water-cooled condenser or evaporative condenser; Described intercooler is plate type heat exchanger or double pipe heat exchanger.
10. not exclusively cool off duplexing condition refrigeration system in the middle of the throttling according to claim 6, it is characterized in that described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
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