CN103335438A - One-stage throttling incomplete-inter-cooling variable-flow twin-stage compression refrigerating system - Google Patents
One-stage throttling incomplete-inter-cooling variable-flow twin-stage compression refrigerating system Download PDFInfo
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Abstract
The invention discloses a one-stage throttling incomplete-inter-cooling variable-flow twin-stage compression refrigerating system which can adjust refrigerating capacity through changing of the flow of refrigerating fluid. The one-stage throttling incomplete-inter-cooling variable-flow twin-stage compression refrigerating system comprises a plurality of sets of variable-flow twin-stage compression condensing units which are connected between a low-pressure air suction pipeline and a high-pressure liquid supply pipeline in parallel. Each set of variable-flow twin-stage 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 condenser, a throttling valve and an intercooler, wherein an exhaust port of the low-pressure constant-flow compressor is connected with an inlet of the first one-way valve, an exhaust port of the low-pressure variable-flow compressor is connected with an inlet of the second one-way valve, the first one-way valve, the second one-way valve and a side outlet in an intercooler shell are connected in parallel and then connected with an air suction port of the high-pressure variable-flow compressor, an exhaust port of the high-pressure variable-flow compressor is connected with an inlet of the condenser, and an outlet of the condenser is respectively connected with an inlet of the throttling valve and a side inlet of an intercooler pipe.
Description
Technical field
The present invention relates to refrigeration technology field, particularly relate to a kind of by changing the middle not exclusively cooling of the throttling double-stage compressive refrigerating system 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.
At present, realize that by changing refrigerant flow the system of refrigerating capacity control mainly is multi-connected air conditioning system, multi-connected air conditioning system is made up of many Condensing units and Duo Tai indoor evaporator, system realizes the control of refrigerating capacity by changing refrigerant flow, system's flexible operation, be easy to control, be widely used in field of air conditioning.But existing multi-gang air conditioner all is single-stage compression refrigeration system, and cryogenic temperature is higher, only is applicable to field of air conditioning, is not suitable for the lower cold storage freezer system of temperature.
Summary of the invention
The objective of the invention is at the technological deficiency that exists in the prior art, and a kind of many Condensing units parallel connections are provided, carry out the middle not exclusively cooling of the throttling unsteady flow amount double-stage compressive refrigerating system that refrigerating capacity is regulated by changing refrigerant flow.
For realizing that the technical scheme that purpose of the present invention adopts is:
Not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of a kind of throttling, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline and the high pressure feed flow pipeline, every group of described unsteady flow amount twin-stage 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, condenser, choke valve and intercooler; Described low pressure constant flow compressor in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline with described low pressure unsteady flow capacity compressor air entry is in parallel simultaneously, and the described intercooler pipe side outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described high pressure feed flow pipeline; 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, described first check valve outlet, described second check valve outlet is connected with described high voltage variable flow compressor air entry with described intercooler shell-side outlet back in parallel, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, side-entrance is connected described condensator outlet with described intercooler pipe with described choke valve import respectively, and described choke valve outlet is connected with described intercooler shell-side inlet; When cold storage freezer load hour, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously; When cold storage freezer load was big, described low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor were worked simultaneously; When needing to hang down refrigerant flow, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously, described low pressure constant flow compressor shutdown; When needing the intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and described low pressure unsteady flow capacity compressor is shut down; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure unsteady flow capacity compressor are worked simultaneously.
Not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of a kind of throttling, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline and the high pressure feed flow pipeline, every group of described unsteady flow amount twin-stage Condensing units comprises low pressure constant flow compressor, low pressure unsteady flow capacity compressor, high voltage variable flow compressor, first check valve, second check valve, condenser, choke valve and intercooler composition; Described low pressure constant flow compressor in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline with described low pressure unsteady flow capacity compressor air entry is in parallel simultaneously, and the described intercooler pipe side outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described high pressure feed flow pipeline with described choke valve import respectively; 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, described first check valve outlet, the outlet of described second check valve and described intercooler shell-side outlet back in parallel are connected with described high voltage variable flow compressor air entry, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, described condensator outlet is connected with the side-entrance of described intercooler pipe, and described choke valve outlet is connected with described intercooler shell-side inlet; When cold storage freezer load hour, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously; When cold storage freezer load was big, described low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor were worked simultaneously; When needing to hang down refrigerant flow, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously, described low pressure constant flow compressor shutdown; When needing the intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and described low pressure unsteady flow capacity compressor is shut down; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure unsteady flow capacity compressor are worked simultaneously.
Described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjusting of variable refrigerant volume.
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.
Described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor.
Compared with prior art, the invention has the beneficial effects as follows:
1, energy-conservation: in the double-stage compressive refrigerating system of the present invention, the low-pressure stage compressor is made up of low pressure constant flow compressor and low pressure unsteady flow capacity compressor, can starting or stoping according to required refrigerant flow control associated compressors, carry out the refrigerating capacity adjusting by changing refrigerant flow, thereby satisfy various loads to the requirement of refrigerating capacity, refrigeration system can frequently not opened.Simultaneously by changing the refrigerant flow of high voltage variable flow compressor, the output of low pressure unsteady flow capacity compressor, overcome in the prior art the fixedly shortcoming of high and low pressure volumetric ratio, no matter how operating mode changes, and refrigeration system always is in optimum state work, reaches purpose of energy saving.Because adopt the two-shipper compression, cryogenic temperature is low, is applicable to the cold storage freezer system that temperature is lower.
2, the cold storage 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 cold storage temperature of ice house, avoided the fluctuation of cold storage cool house internal temperature, reduced effectively because the dehydration drying loss of the freezed food that temperature fluctuation brings.
3, low cost of manufacture: can adopt a fixed frequency air conditioner compressor and two frequency converting air-conditioner compressor combos to form unsteady flow amount twin-stage Condensing units, manufacturing cost is lower than existing unit head twin-stage Condensing units or the twin-stage Condensing units be made up of the cryogenic compressor combo.
4, 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 cooling prosthomere rheology flow double-stage compressive refrigerating system schematic diagram that not exclusively cools off in the middle of the throttling of the present invention.
Figure 2 shows that the cooling deutomerite rheology flow double-stage compressive refrigerating system schematic diagram that not exclusively cools off in the middle of the throttling of the present invention.
Among the figure: 1. low pressure air suction pipeline, 2. high pressure feed flow pipeline, 3. low pressure constant flow compressor, 4. low pressure unsteady flow capacity compressor, 5. high voltage variable flow compressor, 6-1. first check valve, 6-2. second check valve, 7. condenser, 8. choke valve, 9. intercooler.
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Incomplete cooling unsteady flow amount double-stage compressive refrigerating system is divided into cooling prosthomere rheology flow double-stage compressive refrigerating system and the middle cooling deutomerite rheology flow double-stage compressive refrigerating system that not exclusively cools off of a throttling of the middle not exclusively cooling of a throttling according to the difference of throttle position in the middle of the throttling of the present invention.
Figure 1 shows that the cooling prosthomere rheology flow double-stage compressive refrigerating system schematic diagram that not exclusively cools off in the middle of the throttling of the present invention, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline 1 and the high pressure feed flow pipeline 2.Every group of described unsteady flow amount twin-stage Condensing units comprises low pressure constant flow compressor 3, low pressure unsteady flow capacity compressor 4, high voltage variable flow compressor 5, the first check valve 6-1, the second check valve 6-2, condenser 7, choke valve 8 and intercooler 9.Described low pressure constant flow compressor 3 in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline 1 with described low pressure unsteady flow capacity compressor 4 air entries are in parallel simultaneously, and the described intercooler 9 in every group of described unsteady flow amount twin-stage Condensing units is managed side outlets and is connected with described high pressure feed flow pipeline 2.Described low pressure constant flow compressor 3 exhaust outlets are connected with the described first check valve 6-1 import, described low pressure unsteady flow capacity compressor 4 exhaust outlets are connected with the described second check valve 6-2 import, described first check valve 6-1 outlet, described second check valve 6-2 outlet is connected with described high voltage variable flow compressor 5 air entries with described intercooler 9 shell-sides outlet back in parallel, described high voltage variable flow compressor 5 outlets are connected with described condenser 7 imports, described condenser 7 outlets are connected with described intercooler 9 pipe side-entrances with described choke valve 8 imports respectively, and described choke valve 8 outlets are connected with described intercooler 9 shell-side inlet.
Get back in the middle of the throttling not exclusively the low-pressure steam cold-producing medium of the cooling prosthomere rheology flow double-stage compressive refrigerating system of cooling by the cold storage freezer and enter into low pressure constant flow compressor 3 and low pressure unsteady flow capacity compressor 4 carries out the one-level compression through low pressure air suction pipeline 1, middle pressure superheated vapor cold-producing medium after the compression respectively through the first check valve 6-1 and the second check valve 6-2 with export out from middle cooler 9 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 5, high pressure superheater vaporous cryogen after the compression is condensed into high pressure liquid refrigerant through condenser 7, 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 9 cool stream by intercooler 9 shell-side inlet to part high pressure liquid refrigerant manages side-entrance to the high pressure liquid refrigerant of managing side outlet in intercooler 9 through choke valve 8 throttlings, another part high pressure liquid refrigerant is entered by intercooler 9 pipe side-entrances and is cooled to the high-pressure sub-cooled liquid cold-producing medium in the intercooler 9, and the high-pressure sub-cooled liquid cold-producing medium comes out through high pressure feed flow pipeline 2 to cold storage freezer feed flow from middle cooler 9 pipe side outlets.
When cold storage freezer load hour, low pressure unsteady flow capacity compressor 4 is worked simultaneously with high voltage variable flow compressor 5, realizes the best high and low pressure volumetric ratio of system by the refrigerant flow of adjusting high voltage variable flow compressor 5, low pressure unsteady flow capacity compressor 4; When cold storage freezer load is big, low pressure constant flow compressor 3, low pressure unsteady flow capacity compressor 4 and high voltage variable flow compressor 5 are worked simultaneously, by regulating the refrigerant flow of low pressure unsteady flow capacity compressor 4 and high voltage variable flow compressor 5, the best high and low pressure volumetric ratio of realization system.Refrigeration system is divided into three phases by little refrigerant flow to big refrigerant flow transition: when needs hanged down refrigerant flow, low pressure unsteady flow capacity compressor 4 and high voltage variable flow compressor 5 were worked simultaneously, and low pressure constant flow compressor 3 is shut down; When needing the intermediate refrigerant flow, low pressure constant flow compressor 3 and high voltage variable flow compressor 5 are worked simultaneously, and low pressure unsteady flow capacity compressor 4 is shut down; When needing high refrigerant flow, low pressure constant flow compressor 3, high voltage variable flow compressor 5 and low pressure unsteady flow capacity compressor 4 are worked simultaneously.The middle not exclusively cooling prosthomere rheology flow double-stage compressive refrigerating system of forming by the unsteady flow amount twin-stage Condensing units that is connected in parallel of cooling of a throttling can satisfy various loads to the requirement of refrigerant flow.
Figure 2 shows that the cooling deutomerite rheology flow double-stage compressive refrigerating system schematic diagram that not exclusively cools off in the middle of the throttling of the present invention, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline 1 and the high pressure feed flow pipeline 2.Every group of described unsteady flow amount twin-stage Condensing units comprises low pressure constant flow compressor 3, low pressure unsteady flow capacity compressor 4, high voltage variable flow compressor 5, the first check valve 6-1, the second check valve 6-2, condenser 7, choke valve 8 and intercooler 9.Described low pressure constant flow compressor 3 in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline 1 with described low pressure unsteady flow capacity compressor 4 air entries are in parallel simultaneously, and the described intercooler 9 in every group of described unsteady flow amount twin-stage Condensing units is managed side outlets and is connected with described high pressure feed flow pipeline 2 with described choke valve 8 imports respectively.Described low pressure constant flow compressor 3 exhaust outlets are connected with the described first check valve 6-1 import, described low pressure unsteady flow capacity compressor 4 exhaust outlets are connected with the described second check valve 6-2 import, described first check valve 6-1 outlet, described second check valve 6-2 outlet is connected with described high voltage variable flow compressor 5 air entries with described intercooler 9 shell-sides outlet back in parallel, described high voltage variable flow compressor 5 outlets are connected with described condenser 7 imports, described condenser 7 outlets are connected with described intercooler 9 pipe side-entrances, and described choke valve 8 outlets are connected with described intercooler 9 shell-side inlet.
Get back in the middle of the throttling not exclusively the low-pressure steam cold-producing medium of the cooling deutomerite rheology flow double-stage compressive refrigerating system of cooling by the cold storage freezer and enter into low pressure constant flow compressor 3 and low pressure unsteady flow capacity compressor 4 carries out the one-level compression through low pressure air suction pipeline 1, middle pressure superheated vapor cold-producing medium after the compression respectively through the first check valve 6-1 and the second check valve 6-2 with export out from middle cooler 9 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 5, high pressure superheater vaporous cryogen after the compression is condensed into high pressure liquid refrigerant through condenser 7, entered by the side-entrances of intercooler 9 pipe and to be cooled to the high-pressure sub-cooled liquid cold-producing medium in the intercooler 9, the high-pressure sub-cooled liquid cold-producing medium comes out to be divided into two parts from middle cooler 9 pipe side outlets, to be the saturated gas-liquid two phase refrigerant of middle pressure enter in the intercooler 9 cool stream by intercooler 9 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 9 through choke valve 8 throttlings, another part high-pressure sub-cooled liquid cold-producing medium through high pressure feed flow pipeline 2 to cold storage freezer feed flow.
When cold storage freezer load hour, low pressure unsteady flow capacity compressor 4 is worked simultaneously with high voltage variable flow compressor 5, realizes the best high and low pressure volumetric ratio of system by the refrigerant flow of adjusting high voltage variable flow compressor 5, low pressure unsteady flow capacity compressor 4; When cold storage freezer load is big, low pressure constant flow compressor 3, low pressure unsteady flow capacity compressor 4 and high voltage variable flow compressor 5 are worked simultaneously, by adjusting the refrigerant flow of low pressure unsteady flow capacity compressor 4 and high voltage variable flow compressor 5, the best high and low pressure volumetric ratio of realization system.Refrigeration system is divided into three phases by little refrigerant flow to big refrigerant flow transition: when needs hang down refrigerant flow, and low pressure unsteady flow capacity compressor 4 and 5 work of high voltage variable flow compressor, low pressure constant flow compressor 3 is shut down; When needing the intermediate refrigerant flow, low pressure constant flow compressor 3 and 5 work of high voltage variable flow compressor, low pressure unsteady flow capacity compressor 4 is shut down; When needing high refrigerant flow, low pressure constant flow compressor 3, high voltage variable flow compressor 5 and low pressure unsteady flow capacity compressor 4 are worked simultaneously.The middle not exclusively cooling deutomerite rheology flow double-stage compressive refrigerating system of forming by the unsteady flow amount twin-stage Condensing units that is connected in parallel of cooling of a throttling can satisfy various loads to the requirement of refrigerant flow.
The effect of the first check valve 6-1 and the second check valve 6-2 is among above-described embodiment 1 and the embodiment 2, and when 3 work of low pressure constant flow compressor, the second check valve 6-2 prevents that cold-producing medium from refluxing through low pressure unsteady flow capacity compressor 4; When low compression set unsteady flow capacity compressor 4 was worked, the first check valve 6-1 prevented that cold-producing medium from refluxing through low pressure constant flow compressor 3.
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 any, or other pattern compressor.Described low pressure unsteady flow capacity compressor and described high voltage variable flow compressor be screw compressor, rotor compressor, helical-lobe compressor, piston compressor any, 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.
Unsteady flow amount double-stage compressive refrigerating system of the present invention is 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 unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling, it is characterized in that, comprises the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline and the high pressure feed flow pipeline; Every group of described unsteady flow amount twin-stage 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, condenser, choke valve and intercooler; Described low pressure constant flow compressor in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline with described low pressure unsteady flow capacity compressor air entry is in parallel simultaneously, and the described intercooler pipe side outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described high pressure feed flow pipeline; 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, described first check valve outlet, described second check valve outlet is connected with described high voltage variable flow compressor air entry with described intercooler shell-side outlet back in parallel, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, side-entrance is connected described condensator outlet with described intercooler pipe with described choke valve import respectively, and described choke valve outlet is connected with described intercooler shell-side inlet; When load hour, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously; When load was big, described low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor were worked simultaneously; When needing to hang down refrigerant flow, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously, described low pressure constant flow compressor shutdown; When needing the intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and described low pressure unsteady flow capacity compressor is shut down; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure unsteady flow capacity compressor are worked simultaneously.
2. not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling according to claim 1, it is characterized in that, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjusting of variable refrigerant volume.
3. not exclusively cool off unsteady flow amount double-stage compressive refrigerating 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.
4. not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling according to claim 1, it is characterized in that described intercooler is plate type heat exchanger or double pipe heat exchanger.
5. not exclusively cool off unsteady flow amount double-stage compressive refrigerating 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.
6. one kind is once not exclusively cooled off unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling, it is characterized in that, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline and the high pressure feed flow pipeline, every group of described unsteady flow amount twin-stage Condensing units comprises low pressure constant flow compressor, low pressure unsteady flow capacity compressor, high voltage variable flow compressor, first check valve, second check valve, condenser, choke valve and intercooler composition; Described low pressure constant flow compressor in every group of described unsteady flow amount twin-stage Condensing units is connected with described low pressure air suction pipeline with described low pressure unsteady flow capacity compressor air entry is in parallel simultaneously, and the described intercooler pipe side outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described high pressure feed flow pipeline with described choke valve import respectively; 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, described first check valve outlet, the outlet of described second check valve and described intercooler shell-side outlet back in parallel are connected with described high voltage variable flow compressor air entry, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, described condensator outlet is connected with the side-entrance of described intercooler pipe, and described choke valve outlet is connected with described intercooler shell-side inlet; When load hour, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously; When load was big, described low pressure constant flow compressor, low pressure unsteady flow capacity compressor and high voltage variable flow compressor were worked simultaneously; When needing to hang down refrigerant flow, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are worked simultaneously, described low pressure constant flow compressor shutdown; When needing the intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and described low pressure unsteady flow capacity compressor is shut down; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure unsteady flow capacity compressor are worked simultaneously.
7. not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling according to claim 6, it is characterized in that, described low pressure unsteady flow capacity compressor and high voltage variable flow compressor are any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjusting of variable refrigerant volume.
8. not exclusively cool off unsteady flow amount double-stage compressive refrigerating 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.
9. not exclusively cool off unsteady flow amount double-stage compressive refrigerating system in the middle of the throttling according to claim 6, it is characterized in that described intercooler is plate type heat exchanger or double pipe heat exchanger.
10. not exclusively cool off unsteady flow amount double-stage compressive refrigerating 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.
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| JP2000346478A (en) * | 1999-06-03 | 2000-12-15 | Daikin Ind Ltd | Refrigerator |
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| CN102901261A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling incomplete-intercooling refrigeration system |
| CN102901278A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling complete-intercooling refrigeration system |
| CN102901262A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multiplex secondary throttling and intermediate incomplete cooling type refrigerating system |
| CN102927713A (en) * | 2012-11-12 | 2013-02-13 | 天津商业大学 | Double-stage multi-concatenate secondary throttling refrigerating system with middle cooling completely |
| CN203454453U (en) * | 2013-07-04 | 2014-02-26 | 天津商业大学 | Intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in first throttling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105466060A (en) * | 2015-12-28 | 2016-04-06 | 珠海格力电器股份有限公司 | Variable-capacity two-stage compression system and control method thereof |
| US10247449B2 (en) | 2015-12-28 | 2019-04-02 | Gree Electric Appliances, Inc. Of Zhuhai | Variable-capacity compressor, two-stage compression system and control method thereof |
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Effective date of registration: 20170818 Address after: 101116 Beijing City, Taiwan town Tongzhou District Taiwan Lake Village to the West (the new Hualian Holdings Limited Hospital No. 1 building) Patentee after: BEIJING CTDG AIR CONDITIONING SYSTEM CO., LTD. Address before: Tianjin highway 300134 East Tianjin District of Beichen City Patentee before: Tianjin University Of Commerce |