CN103335438B - 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 in the middle of a kind of throttling carrying out refrigerating capacity adjustment by changing refrigerant flow and not exclusively cool double-stage compressive refrigerating system.
Background technology
The existing double-stage compressive refrigerating system for cold storage freezer adopts temperature to control the start-stop of compressor usually, and when temperature of ice house reaches temperature controller set temperature, refrigeration system quits work; Prescribe a time limit when temperature rises on temperature controller set temperature, refrigeration system is opened.There is a contradiction in such system, when needs startup-shutdown Temperature Difference Ratio is larger, can cause the food dehydration drying loss that in cold storage freezer, store food is brought due to freezing rate difference, food quality declines; When needs startup-shutdown Temperature Difference Ratio is less, refrigeration system is opened frequently, and not only power consumption increases, and can reduce the service life of refrigeration system.In addition existing double-stage compressive refrigerating system high and low pressure volumetric ratio is fixing 1:3 or 1:2, and for the refrigeration system that condensation temperature constantly changes, because high and low pressure volumetric ratio is non-adjustable, refrigeration system is not work under optimum, and energy consumption is high.
At present, the system mainly multi-connected air conditioning system of controlling capacity of refrigeration is realized by changing refrigerant flow, multi-connected air conditioning system is made up of multiple stage Condensing units and multiple stage indoor evaporator, system realizes the control of refrigerating capacity by changing refrigerant flow, system cloud gray model is flexible, be easy to control, be widely used in field of air conditioning.But existing multi-gang air conditioner is all single-stage compression refrigeration system, and cryogenic temperature is higher, is only applicable to field of air conditioning, be not suitable for the cold storage refrigeration storage system that temperature is lower.
Summary of the invention
The object of the invention is the technological deficiency for existing in prior art, and provide a kind of multiple stage Condensing units in parallel, carrying out a throttling middle not exclusively cooling variable-flow double-stage compressive refrigerating system of refrigerating capacity adjustment by changing refrigerant flow.
The technical scheme adopted for realizing object of the present invention is:
Not exclusively variable-flow double-stage compressive refrigerating system is cooled in the middle of an a kind of throttling, comprise the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline and high pressure liquid feeding pipeline, often organize described variable-flow Two-stage Compression condensation unit and be made up of low pressure constant flow compressor, low pressure variable-flow compressor, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler, the described low pressure constant flow compressor often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline with described low pressure variable-flow compressor air entry is in parallel simultaneously, and the described cooling during rolling organ pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with described high pressure liquid feeding pipeline, described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure variable-flow exhaust outlet of compressor is connected with described second check valve inlet, described first one-way valved outlet, described second one-way valved outlet is connected with described high voltage variable flow compressor air entry with after the parallel connection of described intercooler shell-side outlet, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, described condensator outlet is connected with described choke valve import and the side-entrance of described cooling during rolling organ pipe respectively, described choke valve outlet is connected with described intercooler shell-side inlet, when cold storage freezer load is less, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, when cold storage freezer load is larger, described low pressure constant flow compressor, low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, when needing low refrigerant flow, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, described low pressure constant flow compressor shutdown, when needing intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor work simultaneously, described low pressure variable-flow compressor shutdown, when needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compressor work simultaneously.
Not exclusively variable-flow double-stage compressive refrigerating system is cooled in the middle of an a kind of throttling, comprise the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline and high pressure liquid feeding pipeline, often organize described variable-flow Two-stage Compression condensation unit and comprise low pressure constant flow compressor, low pressure variable-flow compressor, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler composition; The described low pressure constant flow compressor often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline with described low pressure variable-flow compressor air entry is in parallel simultaneously, and the described cooling during rolling organ pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with described choke valve import and described high pressure liquid feeding pipeline respectively; Described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure variable-flow exhaust outlet of compressor is connected with described second check valve inlet, described first one-way valved outlet, described second one-way valved outlet are connected with described high voltage variable flow compressor air entry with after the parallel connection of described intercooler shell-side outlet, 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 cooling during rolling organ pipe, and described choke valve outlet is connected with described intercooler shell-side inlet; When cold storage freezer load is less, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously; When cold storage freezer load is larger, described low pressure constant flow compressor, low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously; When needing low refrigerant flow, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, described low pressure constant flow compressor shutdown; When needing intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor work simultaneously, described low pressure variable-flow compressor shutdown; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compressor work simultaneously.
Described low pressure variable-flow compressor and high voltage variable flow compressor are any one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjustment 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 one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor.
Compared with prior art, the invention has the beneficial effects as follows:
1, energy-conservation: in double-stage compressive refrigerating system of the present invention, low-pressure stage compressor is become with low pressure variable-flow compressor bank by low pressure constant flow compressor, can starting or stoping according to required refrigerant flow control associated compressors, refrigerating capacity adjustment is carried out by changing refrigerant flow, thus meeting the requirement of various load to refrigerating capacity, refrigeration system can not frequently be opened.Simultaneously by the refrigerant flow changing high voltage variable flow compressor, low pressure variable-flow compressor exports, overcome in prior art the shortcoming of fixing high and low pressure volumetric ratio, no matter how operating mode changes, and refrigeration system is always in optimum state work, reaches energy-conservation object.Owing to adopting two-shipper compression, cryogenic temperature is low, is applicable to the cold storage refrigeration storage system that temperature is lower.
2, 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, after reaching design temperature, refrigeration system can with lower refrigerant flow work, maintain cold storage temperature of ice house, avoid the fluctuation of cold storage cool house internal temperature, effectively reduce the dehydration drying loss of the freezed food brought due to temperature fluctuation.
3, low cost of manufacture: a fixed frequency air conditioner compressor and two frequency converting air-conditioner compressor combos composition variable-flow Two-stage Compression condensation units can be adopted, manufacturing cost than existing single-head Two-stage Compression condensation unit or the Two-stage Compression condensation unit that is made up of cryogenic compressor combo low.
4, modularization: high voltage variable flow compressor and low pressure variable-flow compressor can adopt the compressor of same rated input power, are conducive to the adjustment of system and are convenient to maintenance process simulation, more easily realizes the modularization of system simultaneously.
Accompanying drawing explanation
Figure 1 shows that throttling variable-flow double-stage compressive refrigerating system schematic diagram before the cooling of not exclusively cooling in the middle of the present invention's throttling.
Figure 2 shows that throttling variable-flow double-stage compressive refrigerating system schematic diagram after the cooling of not exclusively cooling in the middle of the present invention's throttling.
In figure: 1. low pressure air suction pipeline, 2. high pressure liquid feeding pipeline, 3. low pressure constant flow compressor, 4. low pressure variable-flow compressor, 5. high voltage variable flow compressor, 6-1. first check valve, 6-2. second check valve, 7. condenser, 8. choke valve, 9. intercooler.
Detailed description of the invention
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 cooling variable-flow double-stage compressive refrigerating system, according to the difference of throttle position, is divided into throttling variable-flow double-stage compressive refrigerating system after the cooling of not exclusively cooling in the middle of throttling variable-flow double-stage compressive refrigerating system and a throttling before the cooling of not exclusively cooling in the middle of a throttling.
Embodiment 1
Figure 1 shows that throttling variable-flow double-stage compressive refrigerating system schematic diagram before the cooling of not exclusively cooling in the middle of the present invention's throttling, comprise the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline 1 and high pressure liquid feeding pipeline 2.Often organize described variable-flow Two-stage Compression condensation unit and comprise low pressure constant flow compressor 3, low pressure variable-flow compressor 4, high voltage variable flow compressor 5, first check valve 6-1, the second check valve 6-2, condenser 7, choke valve 8 and intercooler 9.The described low pressure constant flow compressor 3 often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline 1 with described low pressure variable-flow compressor 4 air entry is in parallel simultaneously, and the described intercooler 9 pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with described high pressure liquid feeding pipeline 2.Described low pressure constant flow compressor 3 exhaust outlet is connected with described first check valve 6-1 import, described low pressure variable-flow compressor 4 exhaust outlet is connected with described second check valve 6-2 import, described first check valve 6-1 exports, described second check valve 6-2 outlet is connected with described high voltage variable flow compressor 5 air entry with after the parallel connection of described intercooler 9 shell-side outlet, described high voltage variable flow compressor 5 outlet is connected with the import of described condenser 7, described condenser 7 exports and is connected with the import of described choke valve 8 and the side-entrance of described intercooler 9 pipe respectively, described choke valve 8 outlet is connected with described intercooler 9 shell-side inlet.
Got back to the cooling of not exclusively cooling in the middle of a throttling by cold storage freezer before, the low-pressure steam cold-producing medium of throttling variable-flow double-stage compressive refrigerating system enters into low pressure constant flow compressor 3 through low pressure air suction pipeline 1 and low pressure variable-flow compressor 4 carries out one stage of compression, press through in after compression heat steam cold-producing medium respectively through the first check valve 6-1 and the second check valve 6-2 with from intercooler 9 shell-side outlet out press during saturated vapor refrigerant mixed is and press through heat steam cold-producing medium and enter in high voltage variable flow compressor 5 and carry out second level compression, high pressure superheated vapor cold-producing medium after compression is condensed into high pressure liquid refrigerant through condenser 7, condensed high pressure liquid refrigerant is divided into two parts, part high pressure liquid refrigerant through choke valve 8 throttling be after the saturated gas-liquid two phase refrigerant of middle pressure through intercooler 9 shell-side inlet to enter in intercooler 9 cool stream in intercooler 9 pipe side-entrance to the high pressure liquid refrigerant of pipe side outlet, another part high pressure liquid refrigerant is entered in intercooler 9 by the side-entrance of intercooler 9 pipe and is cooled to high-pressure sub-cooled liquid cold-producing medium, high-pressure sub-cooled liquid cold-producing medium from intercooler 9 pipe side outlet out through high pressure liquid feeding pipeline 2 to cold storage freezer feed flow.
When cold storage freezer load is less, low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work simultaneously, realize the best high and low pressure volumetric ratio of system by the refrigerant flow of adjustment high voltage variable flow compressor 5, low pressure variable-flow compressor 4; When cold storage freezer load is larger, low pressure constant flow compressor 3, low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work simultaneously, by regulating the refrigerant flow of low pressure variable-flow compressor 4 and high voltage variable flow compressor 5, the best high and low pressure volumetric ratio of the system that realizes.Refrigeration system is divided into three phases by little refrigerant flow to large refrigerant flow transition: when needing low refrigerant flow, and low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work simultaneously, and low pressure constant flow compressor 3 is shut down; When needing intermediate refrigerant flow, low pressure constant flow compressor 3 and high voltage variable flow compressor 5 work simultaneously, and low pressure variable-flow 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 variable-flow compressor 4 work simultaneously.The requirement of various load to refrigerant flow can be met by throttling variable-flow double-stage compressive refrigerating system before the cooling of the middle not exclusively cooling of a throttling of the variable-flow Two-stage Compression condensation unit composition be connected in parallel.
Embodiment 2
Figure 2 shows that throttling variable-flow double-stage compressive refrigerating system schematic diagram after the cooling of not exclusively cooling in the middle of the present invention's throttling, comprise the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline 1 and high pressure liquid feeding pipeline 2.Often organize described variable-flow Two-stage Compression condensation unit and comprise low pressure constant flow compressor 3, low pressure variable-flow compressor 4, high voltage variable flow compressor 5, first check valve 6-1, the second check valve 6-2, condenser 7, choke valve 8 and intercooler 9.The described low pressure constant flow compressor 3 often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline 1 with described low pressure variable-flow compressor 4 air entry is in parallel simultaneously, and the described intercooler 9 pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with the import of described choke valve 8 and described high pressure liquid feeding pipeline 2 respectively.Described low pressure constant flow compressor 3 exhaust outlet is connected with described first check valve 6-1 import, described low pressure variable-flow compressor 4 exhaust outlet is connected with described second check valve 6-2 import, described first check valve 6-1 exports, described second check valve 6-2 outlet is connected with described high voltage variable flow compressor 5 air entry with after the parallel connection of described intercooler 9 shell-side outlet, described high voltage variable flow compressor 5 outlet is connected with the import of described condenser 7, described condenser 7 outlet is connected with the side-entrance of described intercooler 9 pipe, described choke valve 8 outlet is connected with described intercooler 9 shell-side inlet.
Got back to the cooling of not exclusively cooling in the middle of a throttling by cold storage freezer after, the low-pressure steam cold-producing medium of throttling variable-flow double-stage compressive refrigerating system enters into low pressure constant flow compressor 3 through low pressure air suction pipeline 1 and low pressure variable-flow compressor 4 carries out one stage of compression, press through in after compression heat steam cold-producing medium respectively through the first check valve 6-1 and the second check valve 6-2 with from intercooler 9 shell-side outlet out press during saturated vapor refrigerant mixed is and press through heat steam cold-producing medium and enter in high voltage variable flow compressor 5 and carry out second level compression, high pressure superheated vapor cold-producing medium after compression is condensed into high pressure liquid refrigerant through condenser 7, entered in intercooler 9 by the side-entrance of intercooler 9 pipe and be cooled to high-pressure sub-cooled liquid cold-producing medium, high-pressure sub-cooled liquid cold-producing medium is out divided into two parts from intercooler 9 pipe side outlet, part high-pressure sub-cooled liquid cold-producing medium through choke valve 8 throttling be after the saturated gas-liquid two phase refrigerant of middle pressure through intercooler 9 shell-side inlet to enter in intercooler 9 cool stream in intercooler 9 pipe side-entrance to the high pressure liquid refrigerant of pipe side outlet, another part high-pressure sub-cooled liquid cold-producing medium through high pressure liquid feeding pipeline 2 to cold storage freezer feed flow.
When cold storage freezer load is less, low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work simultaneously, realize the best high and low pressure volumetric ratio of system by the refrigerant flow of adjustment high voltage variable flow compressor 5, low pressure variable-flow compressor 4; When cold storage freezer load is larger, low pressure constant flow compressor 3, low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work simultaneously, by adjusting the refrigerant flow of low pressure variable-flow compressor 4 and high voltage variable flow compressor 5, the best high and low pressure volumetric ratio of the system that realizes.Refrigeration system is divided into three phases by little refrigerant flow to large refrigerant flow transition: when needing low refrigerant flow, and low pressure variable-flow compressor 4 and high voltage variable flow compressor 5 work, and low pressure constant flow compressor 3 is shut down; When needing intermediate refrigerant flow, low pressure constant flow compressor 3 and high voltage variable flow compressor 5 work, and low pressure variable-flow 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 variable-flow compressor 4 work simultaneously.The requirement of various load to refrigerant flow can be met by throttling variable-flow double-stage compressive refrigerating system after the cooling of the middle not exclusively cooling of a throttling of the variable-flow Two-stage Compression condensation unit composition be connected in parallel.
In above-described embodiment 1 and embodiment 2, the effect of the first check valve 6-1 and the second check valve 6-2 is that, when low pressure constant flow compressor 3 works, the second check valve 6-2 prevents cold-producing medium from refluxing through low pressure variable-flow compressor 4; When low compression set Pumps in Variable Water Volume System under Pressure contracting machine 4 works, the first check valve 6-1 prevents cold-producing medium from refluxing through low pressure constant flow compressor 3.
In above-described embodiment 1 and embodiment 2: described low pressure constant flow compressor be screw compressor, rotor compressor, helical-lobe compressor, piston compressor any one, or other pattern compressor.Described low pressure variable-flow compressor and described high voltage variable flow compressor be screw compressor, rotor compressor, helical-lobe compressor, piston compressor any one, or other pattern compressor, variable-flow mode can be by the frequency conversion to alternating current generator or by regulating the time variant voltage of direct current generator, and cold-producing medium unloading and load mode also can be adopted 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 one in electric expansion valve, heating power expansion valve, capillary or orifice throttle, also can be that other can the throttling arrangement of dropping force.Described intercooler can be plate type heat exchanger, double pipe heat exchanger or other pattern heat exchanger.
Variable-flow double-stage compressive refrigerating system of the present invention is when concrete utilization, high voltage variable flow compressor and low pressure variable-flow compressor can adopt the compressor of same rated input power, be conducive to the adjustment of system and be convenient to maintenance process simulation, more easily realizing the modularization of system simultaneously.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles 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. once throttling is middle not exclusively cools a variable-flow double-stage compressive refrigerating system, it is characterized in that, comprises the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline and high pressure liquid feeding pipeline, often organize described variable-flow Two-stage Compression condensation unit to be made up of low pressure constant flow compressor, low pressure variable-flow compressor, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler, the described low pressure constant flow compressor often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline with described low pressure variable-flow compressor air entry is in parallel simultaneously, and the described cooling during rolling organ pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with described high pressure liquid feeding pipeline, described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure variable-flow exhaust outlet of compressor is connected with described second check valve inlet, described first one-way valved outlet, described second one-way valved outlet is connected with described high voltage variable flow compressor air entry with after the parallel connection of described intercooler shell-side outlet, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, described condensator outlet is connected with described choke valve import and the side-entrance of described cooling during rolling organ pipe respectively, described choke valve outlet is connected with described intercooler shell-side inlet, when load is less, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, when load is larger, described low pressure constant flow compressor, low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, when needing low refrigerant flow, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, described low pressure constant flow compressor shutdown, when needing intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor work simultaneously, described low pressure variable-flow compressor shutdown, when needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compressor work simultaneously.
2. not exclusively cool variable-flow double-stage compressive refrigerating system in the middle of a throttling according to claim 1, it is characterized in that, described low pressure variable-flow compressor and high voltage variable flow compressor are any one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjustment of variable refrigerant volume.
3. not exclusively cool variable-flow double-stage compressive refrigerating system in the middle of a 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 variable-flow double-stage compressive refrigerating system in the middle of a 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 variable-flow double-stage compressive refrigerating system in the middle of a throttling according to claim 1, it is characterized in that, described low pressure constant flow compressor is any one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor.
6. an once incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of throttling, it is characterized in that, comprise the many groups variable-flow Two-stage Compression condensation unit be connected in parallel between low pressure air suction pipeline and high pressure liquid feeding pipeline, often organize described variable-flow Two-stage Compression condensation unit and comprise low pressure constant flow compressor, low pressure variable-flow compressor, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler composition; The described low pressure constant flow compressor often organized in described variable-flow Two-stage Compression condensation unit is connected with described low pressure air suction pipeline with described low pressure variable-flow compressor air entry is in parallel simultaneously, and the described cooling during rolling organ pipe side outlet often organized in described variable-flow Two-stage Compression condensation unit is connected with described choke valve import and described high pressure liquid feeding pipeline respectively; Described low pressure constant flow exhaust outlet of compressor is connected with described first check valve inlet, described low pressure variable-flow exhaust outlet of compressor is connected with described second check valve inlet, described first one-way valved outlet, described second one-way valved outlet are connected with described high voltage variable flow compressor air entry with after the parallel connection of described intercooler shell-side outlet, 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 cooling during rolling organ pipe, and described choke valve outlet is connected with described intercooler shell-side inlet; When load is less, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously; When load is larger, described low pressure constant flow compressor, low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously; When needing low refrigerant flow, described low pressure variable-flow compressor and high voltage variable flow compressor work simultaneously, described low pressure constant flow compressor shutdown; When needing intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor work simultaneously, described low pressure variable-flow compressor shutdown; When needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compressor work simultaneously.
7. not exclusively cool variable-flow double-stage compressive refrigerating system in the middle of a throttling according to claim 6, it is characterized in that, described low pressure variable-flow compressor and high voltage variable flow compressor are any one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor, adopt AC frequency conversion, DC frequency-changing or unloading-load time control mode to carry out the adjustment of variable refrigerant volume.
8. not exclusively cool variable-flow double-stage compressive refrigerating system in the middle of a 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 variable-flow double-stage compressive refrigerating system in the middle of a 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 variable-flow double-stage compressive refrigerating system in the middle of a throttling according to claim 6, it is characterized in that, described low pressure constant flow compressor is any one in screw compressor, rotor compressor, helical-lobe compressor, piston compressor.
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| JP5561243B2 (en) * | 2011-06-09 | 2014-07-30 | 株式会社デンソー | Refrigeration cycle |
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| CN102901262B (en) * | 2012-11-12 | 2014-08-06 | 天津商业大学 | Two-stage multiplex secondary throttling and intermediate incomplete cooling type refrigerating system |
| CN102901278B (en) * | 2012-11-12 | 2014-10-01 | 天津商业大学 | Two-stage multi-unit single-throttling complete-intercooling refrigeration system |
| CN102927713B (en) * | 2012-11-12 | 2015-03-11 | 天津商业大学 | Double-stage multi-concatenate secondary throttling refrigerating system with middle cooling completely |
| CN102901261B (en) * | 2012-11-12 | 2014-11-12 | 天津商业大学 | Two-stage multi-unit single-throttling incomplete-intercooling refrigeration system |
| 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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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 |