CN203454451U - Intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in secondary throttling - Google Patents
Intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in secondary throttling Download PDFInfo
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- CN203454451U CN203454451U CN201320394879.3U CN201320394879U CN203454451U CN 203454451 U CN203454451 U CN 203454451U CN 201320394879 U CN201320394879 U CN 201320394879U CN 203454451 U CN203454451 U CN 203454451U
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Abstract
The utility model discloses an intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in secondary throttling, which is the variable-flow two-stage compression refrigeration system for regulation of refrigerating capacity by changing the flow of a refrigerant, and comprises a plurality of sets of variable-flow two-stage compression condenser sets connected in parallel between a low-pressure inspiration pipeline and a middle-pressure feeding pipeline; and each of the variable-flow two-stage compression condenser sets comprises a long-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 intermediate cooler, wherein an exhaust port of the low-pressure constant-flow compressor is connected to an inlet of the first check valve, the exhaust port of the low-pressure variable-flow compressor is connected to the inlet of the second check valve, outlets of the first check valve and the second check valve are connected to an air suction port of the high-pressure variable-flow compressor after being connected in parallel with the outlet of the intermediate cooler, the exhaust port of the high-pressure variable-flow compressor is connected to the inlet of the condenser and the outlet of the condenser is connected to the inlet of the intermediate cooler through the throttle valve.
Description
Technical field
The utility model relates to refrigeration technology field, particularly relates to a kind of middle incomplete cooling variable-flow double-stage compressive refrigerating system of second throttle that carries out refrigerating capacity adjusting by changing refrigerant flow.
Background technology
The existing double-stage compressive refrigerating system for cold storage freezer adopts temperature to control the start-stop of compressor conventionally, and when temperature of ice house reaches temperature controller set temperature, refrigeration system quits work; When temperature rises on temperature controller set temperature, prescribe a time limit, 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, and food quality declines; When needs startup-shutdown Temperature Difference Ratio hour, refrigeration system is opened frequently, not only power consumption increase, and the service life that can reduce refrigeration system.In addition existing double-stage compressive refrigerating system high and low pressure volumetric ratio is fixing 1:3 or 1:2, the refrigeration system constantly changing for condensation temperature, and because high and low pressure volumetric ratio is non-adjustable, refrigeration system is not to work under optimum, energy consumption is high.
At present, the system that realizes controlling capacity of refrigeration by changing refrigerant flow is mainly multi-connected air conditioning system, multi-connected air conditioning system is comprised of many Condensing units and Duo Tai indoor evaporator, system realizes the control of refrigerating capacity by changing refrigerant flow, system flexible operation, 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.
Utility model content
The purpose of this utility model is for the technological deficiency existing in prior art, and a kind of many Condensing units parallel connections are provided, by changing refrigerant flow, carry out incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of the second throttle of refrigerating capacity adjusting.
For realizing the technical scheme that the purpose of this utility model adopts, be:
An incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle, comprises the many groups variable-flow Two-stage Compression condensation unit being connected in parallel between low pressure air suction pipeline and middle pressure liquid feeding pipeline; Described in every group, variable-flow Two-stage Compression condensation unit is comprised of low pressure constant flow compressor, low pressure variable-flow compression machine, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler; Described low pressure constant flow compressor described in every group in variable-flow Two-stage Compression condensation unit and described low pressure variable-flow compression machine in parallel connection with described low pressure air suction pipeline of air entry simultaneously, the described intercooler liquid outlet described in every group in variable-flow Two-stage Compression condensation unit is connected with described middle pressure liquid feeding pipeline; Described low pressure constant flow exhaust outlet of compressor is connected with described the first check valve inlet, described low pressure variable-flow compression machine exhaust outlet is connected with described the second check valve inlet, described the first check valve outlet, described the second check valve export and are connected with described high voltage variable flow compressor air entry after the parallel connection of described intercooler gas vent, 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 variable-flow compression machine and high voltage variable flow compressor are worked simultaneously; When cold storage freezer load is larger, described low pressure constant flow compressor, low pressure variable-flow compression machine and high voltage variable flow compressor are worked simultaneously; In the time of need to low refrigerant flow, low pressure variable-flow compression machine and high voltage variable flow compressor be worked simultaneously, low pressure constant flow compressor shutdown; While needing intermediate refrigerant flow, low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and low pressure variable-flow compression machine is shut down; While needing high refrigerant flow, low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compression machine are worked simultaneously.
Described low pressure variable-flow compression machine and high voltage variable flow compressor are any 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 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, piston compressor.
Compared with prior art, the beneficial effects of the utility model are:
1, energy-conservation: in double-stage compressive refrigerating system of the present utility model, low-pressure stage compressor is comprised of low pressure constant flow compressor and low pressure variable-flow compression machine, can starting or stoping according to required refrigerant flow control associated compressors, by changing refrigerant flow, carry out refrigerating capacity adjusting, thereby meet the requirement of various loads to refrigerating capacity, refrigeration system can frequently not opened.Simultaneously by changing the refrigerant flow of high and low pressure compressor output, overcome in prior art the fixedly shortcoming of high and low pressure volumetric ratio, no matter how operating mode changes, and refrigeration system, 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 adjusting the refrigerant flow of refrigeration system, system can be adjusted refrigerant flow automatically according to the load variations of cold storage freezer, after reaching design temperature, refrigeration system can be with lower refrigerant flow work, maintain cold storage temperature of ice house, avoid the fluctuation of cold storage cool house internal temperature, effectively reduced the dehydration drying loss of the freezed food bringing due to temperature fluctuation.
3, low cost of manufacture: can adopt a fixed frequency air conditioner compressor and two frequency converting air-conditioner compressor combos to form variable-flow Two-stage Compression condensation units, manufacturing cost is lower than existing single-head Two-stage Compression condensation unit or the Two-stage Compression condensation unit that is comprised of cryogenic compressor combo.
4, modularization: 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, more easily realizes the modularization of system simultaneously.
Accompanying drawing explanation
Figure 1 shows that the middle incomplete cooling variable-flow double-stage compressive refrigerating system schematic diagram of the utility model second throttle.
In figure: 1. low pressure air suction pipeline, press liquid feeding pipeline in 2., 3. low pressure constant flow compressor, 4. low pressure variable-flow compression machine, 5. high voltage variable flow compressor, 6-1. the first check valve, 6-2. the second check valve, 7. condenser, 8. choke valve, 9. intercooler.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Figure 1 shows that the middle incomplete cooling variable-flow double-stage compressive refrigerating system schematic diagram of the utility model second throttle, comprise the many groups variable-flow Two-stage Compression condensation unit being connected in parallel between low pressure air suction pipeline 1 and middle pressure liquid feeding pipeline 2.Described in every group, variable-flow Two-stage Compression condensation unit is comprised of low pressure constant flow compressor 3, low pressure variable-flow compression machine 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 described in every group in variable-flow Two-stage Compression condensation unit and described low pressure variable-flow compression machine in parallel connection with described low pressure air suction pipeline 1 of 4 air entries, described intercooler 9 liquid outlets described in every group in variable-flow Two-stage Compression condensation unit are connected with described middle pressure liquid feeding pipeline 2 simultaneously.Described low pressure constant flow compressor 3 exhaust outlets are connected with described the first check valve 6-1 import, described low pressure variable-flow compression machine 4 exhaust outlets are connected with described the second check valve 6-2 import, described the first check valve 6-1 outlet, described the second check valve 6-2 outlet are connected with described high voltage variable flow compressor 5 air entries with after described intercooler 9 gas vent parallel connections, 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 import by described choke valve 8.
The low-pressure steam cold-producing medium of getting back to incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle by cold storage freezer enters into low pressure constant flow compressor 3 and low pressure variable-flow compression machine 4 carries out one-level compression through low pressure air suction pipeline 1, middle pressure superheated vapor cold-producing medium after compression respectively through the first check valve 6-1 and the second check valve 6-2 with from intercooler 9 gas vents out pressure saturated vapor refrigerant mixed be that middle pressure superheated vapor cold-producing medium enters and in high voltage variable flow compressor 5, carries out second level compression, high pressure superheater vaporous cryogen after compression is condensed into high pressure liquid refrigerant through condenser 7, in choke valve 8, throttling is to enter in intercooler 9 after the saturated gas-liquid two phase refrigerant of middle pressure, middle pressure saturated vapor cold-producing medium participates in second level compression, middle pressure saturated liquid cold-producing medium presses liquid feeding pipeline 2 to cold storage freezer feed flow in warp.
When cold storage freezer load hour, low pressure variable-flow compression machine 4 is worked with high voltage variable flow compressor 5 simultaneously, by adjusting the refrigerant flow of high voltage variable flow compressor 5, low pressure variable-flow compression machine 4, realizes the best high and low pressure volumetric ratio of system; When cold storage freezer load is larger, low pressure constant flow compressor 3, low pressure variable-flow compression machine 4 and high voltage variable flow compressor 5 are worked simultaneously, by regulating the refrigerant flow of low pressure variable-flow compression machine 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: in the time of need to low refrigerant flow, and low pressure variable-flow compression machine 4 and 5 work of high voltage variable flow compressor, low pressure constant flow compressor 3 is shut down; While needing intermediate refrigerant flow, low pressure constant flow compressor 3 and 5 work of high voltage variable flow compressor, low pressure variable-flow compression machine 4 is shut down; While needing high refrigerant flow, low pressure constant flow compressor 3, high voltage variable flow compressor 5 and low pressure variable-flow compression machine 4 are worked simultaneously.In the middle of the second throttle consisting of the variable-flow Two-stage Compression condensation unit being connected in parallel, incomplete cooling variable-flow double-stage compressive refrigerating system can meet the requirement of various loads to refrigerant flow.
The effect of described the 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 variable-flow compression machine 4; When low compression set Pumps in Variable Water Volume System under Pressure contracting machine 4 work, the first check valve 6-1 prevents that cold-producing medium from refluxing through low pressure constant flow compressor 3.
Low pressure constant flow compressor described in the utility model is any in screw compressor, rotor compressor, helical-lobe compressor, piston compressor, or other pattern compressor.Described low pressure variable-flow compression machine and described high voltage variable flow compressor be screw compressor, rotor compressor, helical-lobe compressor, piston compressor any, or other pattern compressor, variable-flow 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 adopt 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 orifice throttle, can be also 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.
Variable-flow double-stage compressive refrigerating system of the present utility model is when concrete utilization, high pressure compressor and low pressure compressor can adopt the compressor of same rated input power, be conducive to the adjustment of system and be convenient to maintenance and maintenance, more easily realize the modularization of system simultaneously.
The above is only preferred embodiment of the present utility model; it should be noted that; for those skilled in the art; do not departing under the prerequisite of the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (5)
1. an incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle, is characterized in that, comprises the many groups variable-flow Two-stage Compression condensation unit being connected in parallel between low pressure air suction pipeline and middle pressure liquid feeding pipeline; Described in every group, variable-flow Two-stage Compression condensation unit is comprised of low pressure constant flow compressor, low pressure variable-flow compression machine, high voltage variable flow compressor, the first check valve, the second check valve, condenser, choke valve and intercooler; Described low pressure constant flow compressor described in every group in variable-flow Two-stage Compression condensation unit and described low pressure variable-flow compression machine in parallel connection with described low pressure air suction pipeline of air entry simultaneously, the described intercooler liquid outlet described in every group in variable-flow Two-stage Compression condensation unit is connected with described middle pressure liquid feeding pipeline; Described low pressure constant flow exhaust outlet of compressor is connected with described the first check valve inlet, described low pressure variable-flow compression machine exhaust outlet is connected with described the second check valve inlet, described the first check valve outlet, described the second check valve export and are connected with described high voltage variable flow compressor air entry after the parallel connection of described intercooler gas vent, 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 variable-flow compression machine and high voltage variable flow compressor are worked simultaneously; When load is larger, described low pressure constant flow compressor, low pressure variable-flow compression machine and high voltage variable flow compressor are worked simultaneously; In the time of need to low refrigerant flow, described low pressure variable-flow compression machine and high voltage variable flow compressor be worked simultaneously, described low pressure constant flow compressor shutdown; While needing intermediate refrigerant flow, described low pressure constant flow compressor and high voltage variable flow compressor are worked simultaneously, and described low pressure variable-flow compression machine is shut down; While needing high refrigerant flow, described low pressure constant flow compressor, high voltage variable flow compressor and low pressure variable-flow compression machine are worked simultaneously.
2. incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle according to claim 1, it is characterized in that, described low pressure variable-flow compression machine and high voltage variable flow compressor are any 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 adjusting of variable refrigerant volume.
3. incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle according to claim 1, is characterized in that, described choke valve is electric expansion valve, heating power expansion valve, capillary or orifice plate.
4. incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle according to claim 1, is characterized in that, described intercooler is plate type heat exchanger or double pipe heat exchanger.
5. incomplete cooling variable-flow double-stage compressive refrigerating system in the middle of second throttle according to claim 1, is characterized in that, described low pressure constant flow compressor is any in screw compressor, rotor compressor, helical-lobe compressor, piston compressor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320394879.3U CN203454451U (en) | 2013-07-04 | 2013-07-04 | Intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in secondary throttling |
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| CN201320394879.3U CN203454451U (en) | 2013-07-04 | 2013-07-04 | Intermediate inadequacy cooling variable-flow two-stage compression refrigeration system in secondary throttling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335441A (en) * | 2013-07-04 | 2013-10-02 | 天津商业大学 | Secondary throttling middle incomplete cooling variable flow double-stage compression refrigeration system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103335441A (en) * | 2013-07-04 | 2013-10-02 | 天津商业大学 | Secondary throttling middle incomplete cooling variable flow double-stage compression refrigeration system |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140226 Effective date of abandoning: 20150401 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20140226 Effective date of abandoning: 20150401 |
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| RGAV | Abandon patent right to avoid regrant |