CN103344059A - Secondary throttling middle complete cooling variable flow two-stage compression refrigerating system - Google Patents
Secondary throttling middle complete cooling variable flow two-stage compression refrigerating system Download PDFInfo
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- CN103344059A CN103344059A CN2013102785562A CN201310278556A CN103344059A CN 103344059 A CN103344059 A CN 103344059A CN 2013102785562 A CN2013102785562 A CN 2013102785562A CN 201310278556 A CN201310278556 A CN 201310278556A CN 103344059 A CN103344059 A CN 103344059A
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Abstract
The invention discloses a secondary throttling middle complete cooling variable flow two-stage compression refrigerating system, and provides the refrigerating system which is formed by a plurality of compression condensing units in a parallel mode and conducts refrigerating capacity adjusting through the change of refrigerant flow. The refrigerating system comprises a plurality of variable flow two-stage compression condensing units which are connected in parallel between a low-pressure gas absorption pipeline and a middle-pressure liquid supply pipeline, wherein each variable flow two-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 check valve, a second check valve, a condenser, a throttle valve and an intercooler. The exhaust port of the low-pressure constant flow compressor is connected with the inlet of the first check valve, the exhaust port of the low-pressure variable flow compressor is connected with the inlet of the second check valve, the outlet of the first check valve is connected with the outlet of the second check valve in parallel and then connected with the inlet, under the water level, of the intercooler, the gas outlet of the intercooler is connected with the gas absorption opening of the high-pressure variable flow compressor, and the exhaust port of the high-pressure variable flow compressor is connected with the inlet of the condenser.
Description
Technical field
The present invention relates to refrigeration technology field, particularly relate to a kind of by changing the middle double-stage compressive refrigerating system that cools off fully of second throttle 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.
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 unsteady flow amount double-stage compressive refrigerating system that cools off fully of second throttle that refrigerating capacity is regulated by changing refrigerant flow.
For realizing that the technical scheme that purpose of the present invention adopts is:
Cool off unsteady flow amount double-stage compressive refrigerating system in the middle of a kind of second throttle fully, comprise the many groups unsteady flow amount twin-stage Condensing units that is connected in parallel between low pressure air suction pipeline and the middle 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 liquid outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described middle 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 is connected with described intercooler liquid level below import with described second check valve outlet back in parallel, described intercooler gas vent is connected with described high voltage variable flow compressor air entry, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, and described condensator outlet is connected with described intercooler import by described choke valve; 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 and low pressure compressor output, 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 pressure compressor and low pressure compressor can adopt the compressor of same rated input power, are conducive to the adjustment of system and are convenient to maintenance and maintenance, the modularization of easier realization of while system.
Description of drawings
Figure 1 shows that the middle schematic diagram that cools off unsteady flow amount double-stage compressive refrigerating system fully of second throttle of the present invention.
Among the figure: 1. low pressure air suction pipeline, press the feed flow pipeline in 2., 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.
Figure 1 shows that the middle schematic diagram that cools off unsteady flow amount double-stage compressive refrigerating system fully of second throttle 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 middle 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 compositions.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 described intercooler 9 liquid outlets in every group of described unsteady flow amount twin-stage Condensing units are connected with described middle 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 is connected with described intercooler 9 liquid levels below import with described second check valve 6-2 outlet back in parallel, described intercooler 9 gas vents are connected with described high voltage variable flow compressor 5 air entries, described high voltage variable flow compressor 5 exhaust outlets are connected with described condenser 7 imports, and described condenser 7 outlets are connected with described intercooler 9 imports by described choke valve 8.
Got back to the low-pressure steam cold-producing medium that cools off unsteady flow amount double-stage compressive refrigerating system in the middle of the second throttle fully 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 enters from middle cooler 9 liquid levels below import the liquid of intercooler 9 by liquid cools to saturation state through the first check valve 6-1 and the second check valve 6-2 respectively, from middle cooler 9 gas vents come out pressure saturated vapor cold-producing medium enter and carry 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, throttling is to enter in the intercooler 9 after the saturated gas-liquid two phase refrigerant of middle pressure in choke valve 8, in press the saturated vapor cold-producing medium to participate in second level compression, middle pressure saturated liquid cold-producing medium then through in press feed flow pipeline 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 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.Cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of the second throttle of forming by the unsteady flow amount twin-stage Condensing units that is connected in parallel and can satisfy various loads to the requirement of refrigerant flow.
The effect of the described first check valve 6-1 and the second check valve 6-2 is that 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.
Low pressure constant flow compressor of the present invention 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-load time control 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, also can be other throttling arrangement that can reduce refrigerant pressure.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, and high pressure compressor and low pressure compressor can adopt the compressor of same rated input power, is conducive to the adjustment of system and is 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 (5)
1. cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of a second throttle, 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 middle 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 liquid outlet in every group of described unsteady flow amount twin-stage Condensing units is connected with described middle 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 is connected with described intercooler liquid level below import with described second check valve outlet back in parallel, described intercooler gas vent is connected with described high voltage variable flow compressor air entry, described high voltage variable flow compressor exhaust outlet is connected with described condenser inlet, and described condensator outlet is connected with described intercooler import by described choke valve; 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. cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of the second throttle according to claim 1, it is characterized in that, described low pressure unsteady flow capacity compressor and 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. cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of the second throttle according to claim 1, it is characterized in that described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
4. cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of the second throttle according to claim 1, it is characterized in that described intercooler is plate type heat exchanger or double pipe heat exchanger.
5. cool off unsteady flow amount double-stage compressive refrigerating system fully in the middle of the second throttle according to claim 1, it is characterized in that described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, the piston compressor.
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| CN111734617A (en) * | 2020-07-27 | 2020-10-02 | 上海海立新能源技术有限公司 | Compressor and compressor flow protection device and method thereof |
| CN112033036A (en) * | 2020-08-17 | 2020-12-04 | 珠海格力电器股份有限公司 | Refrigerating system, control method and air conditioner |
| CN115559922A (en) * | 2022-10-14 | 2023-01-03 | 势加透博(成都)科技有限公司 | Compressor |
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Effective date of registration: 20170418 Address after: Chencun Le Jinhua neighborhood road Shunde District 528313 Guangdong city of Foshan province No. 26 North Patentee after: Shunde City, Foshan District, the Olympic Games refrigeration kitchen Co., Ltd. Address before: Tianjin highway 300134 East Tianjin District of Beichen City Patentee before: Tianjin University Of Commerce |
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Effective date of registration: 20180817 Address after: 313017 Heng Gang village, Fu Fu town, Nanxun District, Huzhou, Zhejiang Patentee after: Ren Xingen Address before: 528313 north side of No. 26 Jinhua Road, Chen Zhu Town neighborhood committee, Shunde District, Foshan, Guangdong Patentee before: Shunde City, Foshan District, the Olympic Games refrigeration kitchen Co., Ltd. |
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Effective date of registration: 20190513 Address after: 226017 No.4 Production Workshop, 203 Qingfeng Road, Sutong Science and Technology Industrial Park, Nantong City, Jiangsu Province Patentee after: Nantong Meijile Refrigeration Equipment Co., Ltd. Address before: 313017 Heng Gang village, Fu Fu town, Nanxun District, Huzhou, Zhejiang Patentee before: Ren Xingen |