CN102022851A - Two-stage compression refrigerating system - Google Patents
Two-stage compression refrigerating system Download PDFInfo
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- CN102022851A CN102022851A CN 201010600349 CN201010600349A CN102022851A CN 102022851 A CN102022851 A CN 102022851A CN 201010600349 CN201010600349 CN 201010600349 CN 201010600349 A CN201010600349 A CN 201010600349A CN 102022851 A CN102022851 A CN 102022851A
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Abstract
The invention discloses a two-stage compression refrigerating system. The two-stage compression refrigerating system is easy for energy regulation and can realize switch between a high-pressure refrigerating compressor and a low-pressure refrigerating compressor so as to improve the efficiency of the refrigerating system. The air exhaust end of each refrigerating compressor is respectively connected with a first electromagnetic valve and a second electromagnetic valve, and the air suction end of each refrigerating compressor is respectively connected with a third electromagnetic valve and a fourth electromagnetic valve. After the parallel connection, all the first electromagnetic valves connected on the refrigerating compressors are connected with an inlet of a condenser. After the parallel connection, all the second electromagnetic valves connected on the refrigerating compressors are connected with an outlet at the shell side of an intercooler. After the parallel connection, all the third electromagnetic valves connected on the refrigerating compressors are connected with the outlet at the shell side of the intercooler. After the parallel connection, all the fourth electromagnetic valves connected on the refrigerating compressors are connected with an outlet of an evaporimeter. Through the opening or closing of the electromagnetic valves connected with the refrigerating compressors, the switch between the high-pressure stage and the low-pressure stage can be realized.
Description
Technical field
The present invention relates to a kind of cooling cycle system, in particular, relate to a kind of twin-stage compression refrigeration circulation of multimachine head,, can carry out energy adjustment for the refrigerating capacity of refrigeration system simultaneously in order to improve the efficient of twin-stage compression refrigeration circulation.
Background technology
Double-stage compressive refrigerating system is that the low-temperature low-pressure refrigerant steam of flash-pot in the future is compressed to after the suitable intermediate pressure with the low-pressure stage refrigeration compressor earlier, enter the hiigh pressure stage refrigeration compressor and be compressed to condensing pressure once more, enter in the condenser, this system is applicable to the refrigeration system that compression ratio is bigger.Hiigh pressure stage refrigeration compressor of the prior art was fixed as 1: 3 or 1: 2 than generally with the minimum cylinder volume of low-pressure stage refrigeration compressor, but because the condensing pressure of refrigeration system can be with variation of ambient temperature, the cylinder ratio of the intermediate pressure of system and refrigeration compressor and low-pressure stage refrigeration compressor also can constantly change, and this is uneconomic for the high-low pressure cylinder ratio that designs.Decide the frequency mode because existing double-stage compressive refrigerating system all adopts in addition, the energy adjustment of refrigeration system is dumb, and system can only rely on startup-shutdown to carry out energy adjustment, and the result is that temperature fluctuation is big in the freezer.
Summary of the invention
The present invention is in order to overcome weak point of the prior art, a kind of double-stage compressive refrigerating system that is easy to energy adjustment to be provided, can also realize the mutual conversion of hiigh pressure stage refrigeration compressor and low-pressure stage refrigeration compressor simultaneously, improving the efficient of refrigeration system.
The present invention is achieved through the following technical solutions:
The double-stage compressive refrigerating system that not exclusively cools off in the middle of a kind of one-level throttling, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the shell-side outlet of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the shell-side outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the pipe side-entrance of intercooler, and the pipe side outlet of intercooler is connected with the import of evaporimeter by second choke valve; The first throttle valve is connected between the shell-side inlet and pipe side outlet of intercooler, and perhaps the first throttle valve is connected between the outlet of the shell-side inlet of intercooler and condenser.
The double-stage compressive refrigerating system that cools off fully in the middle of a kind of one-level throttling, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the liquid level below shell-side interface of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the shell-side gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the pipe side-entrance of intercooler, and the pipe side outlet of intercooler is connected with the import of evaporimeter by second choke valve; The first throttle valve is connected between the outlet of the shell-side inlet of intercooler and condenser.
The double-stage compressive refrigerating system that not exclusively cools off in the middle of a kind of two-step throttle, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the gaseous phase outlet of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the shell-side inlet of intercooler by the first throttle valve, and the liquid phase outlet of intercooler is connected with the import of evaporimeter by second choke valve.
The double-stage compressive refrigerating system that cools off fully in the middle of a kind of two-step throttle, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the liquid level below shell-side interface of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the shell-side inlet of intercooler by the first throttle valve, and the liquid phase outlet of intercooler is connected with the import of evaporimeter by second choke valve.
The present invention has following technique effect:
Double-stage compressive refrigerating system of the present invention is made up of many groups refrigeration compressor set, the unlatching of the magnetic valve by being connected in each refrigeration compressor air suction end and exhaust end or close, can realize the mutual conversion of hiigh pressure stage refrigeration compressor and low-pressure stage refrigeration compressor, thereby single-stage refrigerant compression and two-stage refrigeration compression cycle can be provided.Simultaneously, same refrigeration compressor not only can be used for low-pressure stage but also can be used for hiigh pressure stage, not only saved one-time investment but also has been convenient to the energy adjustment of refrigeration system, improved the efficient of refrigeration system.And the adjusting of refrigeration system is flexible, convenient, and temperature fluctuation is little in the freezer.
Description of drawings
Fig. 1 is the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of a kind of one-level throttling of the present invention;
Fig. 2 is the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of the another kind of one-level throttling of the present invention;
Fig. 3 is the middle schematic diagram of the two-stage refrigeration compressibility of cooling fully of one-level throttling;
Fig. 4 is the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of the two-step throttle;
Fig. 5 is the middle schematic diagram of the double-stage compressive refrigerating system of cooling fully of two-step throttle.
The specific embodiment
Double-stage compressive refrigerating system of the present invention is by many refrigeration compressor parallel connections, the unlatching of the magnetic valve by being connected in each refrigeration compressor air suction end and exhaust end or close, can realize the mutual conversion of hiigh pressure stage refrigeration compressor and low-pressure stage refrigeration compressor, thereby single-stage refrigerant compression and two-stage refrigeration compression cycle can be provided.Incomplete incomplete four kinds of forms such as cooling in the middle of cooling and the two-step throttle fully in the middle of cooling, the two-step throttle in the middle of cooling, the one-level throttling fully in the middle of the change on the connected mode of the form of the quantity of choke valve, intercooler and choke valve and intercooler can have the one-level throttling.
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 comprises many refrigeration compressors 1, condenser 3, evaporimeter 5, intercooler 4 for the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of the one-level throttling of the present invention, and intercooler is shell and tube exchanger or plate type heat exchanger.The exhaust end of every refrigeration compressor 1 is connected with the first magnetic valve 2-1 and the second magnetic valve 2-2 respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve 2-3 and the 4th magnetic valve 2-4 respectively, the first magnetic valve 2-1 that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser 3, be connected with the shell-side outlet of intercooler 4 after the second magnetic valve 2-2 parallel connection that connects on every refrigeration compressor, be connected with the shell-side outlet of intercooler 4 after the 3rd magnetic valve 2-3 parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter 5 after the 4th magnetic valve 2-4 parallel connection that connects on every refrigeration compressor.The outlet of condenser 3 is connected with the pipe side-entrance of intercooler 4, and the pipe side outlet of intercooler is connected with the import of evaporimeter 5 by the second choke valve 6-2.First throttle valve 6-1 is connected between the outlet of the shell-side inlet of intercooler and condenser 3.
The double-stage compressive refrigerating system that not exclusively cools off in the middle of the one-level throttling shown in Figure 1 can be realized single stage compress kind of refrigeration cycle and twin-stage compression refrigeration circulation.
1, single stage compress kind of refrigeration cycle:
The first magnetic valve 2-1 that is connected with each refrigeration compressor opens, and the second magnetic valve 2-2 closes, and the 3rd magnetic valve 2-3 closes, and the 4th magnetic valve 2-4 opens.For every refrigeration compressor, refrigeration compressor compresses the high-pressure refrigerant that and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1, enter through intercooler 4 that throttling is depressurized to low pressure among the choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, get back to refrigeration compressor through the 4th magnetic valve 2-4, realize the single stage compress kind of refrigeration cycle.
2, twin-stage compression refrigeration circulation:
Serve as the low-pressure stage refrigeration compressor for one or several in many refrigeration compressors and use, remaining refrigeration compressor is served as the hiigh pressure stage refrigeration compressor and is used.
Circulation in low-pressure stage refrigeration compressor part is: close with the first magnetic valve 2-1 that is connected as the low-pressure stage refrigeration compressor, the second magnetic valve 2-2 opens, the 3rd magnetic valve 2-3 closes, the 4th magnetic valve 2-4 unlatching.High-pressure refrigerant after the condenser 3 condensation heat releases enters from the pipe side-entrance of middle cooler 4, cross through heat release and to flow out from the pipe side outlet of middle cooler 4 after cold, throttling is depressurized to low pressure in the second choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, enter in the low-pressure stage refrigeration compressor through the 4th magnetic valve 2-4, the low-pressure stage refrigeration compressor compress the middle compacting cryogen that through the second magnetic valve 2-2 with export out from middle cooler 4 shell-sides the compacting cryogen be mixed into the suction end of hiigh pressure stage refrigeration compressor.
Circulation in hiigh pressure stage refrigeration compressor part is: the first magnetic valve 2-1 that is connected with the hiigh pressure stage refrigeration compressor opens, the second magnetic valve 2-2 closes, the 3rd magnetic valve 2-3 opens, the 4th magnetic valve 2-4 closes.Middle compacting cryogen is compressed to high pressure in the hiigh pressure stage refrigeration compressor, enter condensation heat release in the condenser 3 through the first magnetic valve 2-1.The high-pressure refrigerant that comes out from condenser 3 is divided into two-way, and one the road to enter the intercooler 4 heat release from the 4 pipe side-entrances of middle cooler cold excessively, is depressurized to low pressure through the second choke valve 6-2 throttling and enters in the evaporimeter 5; Another road through first throttle valve 6-1 throttling to intermediate pressure, enter the back of absorbing heat the intercooler 4 from middle cooler 4 shell-side inlet and flow out from middle cooler 4 shell-sides outlet, the middle compacting cryogen of discharging with the low-pressure stage refrigeration compressor mixes after the 3rd magnetic valve 2-3 enters the hiigh pressure stage refrigeration compressor.
The connected mode that is connected to many refrigeration compressors in the system is in parallel, opening and closing by magnetic valve, arbitrary compressor both can be used as the low-pressure stage refrigeration compressor and had used, also can be used as the hiigh pressure stage refrigeration compressor uses, so help regulating the high and low pressure minimum cylinder volume ratio of double-stage compressive refrigerating system, thereby improve the efficient of double-stage compressive refrigerating system.
Embodiment 2
Fig. 2 is the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of the another kind of one-level throttling of the present invention, the connected mode difference of first throttle valve, and other structures and embodiment 1 are identical.
Comprise many refrigeration compressors 1, condenser 3, evaporimeter 5, intercooler 4, intercooler is shell and tube exchanger or plate type heat exchanger.The exhaust end of every refrigeration compressor 1 is connected with the first magnetic valve 2-1 and the second magnetic valve 2-2 respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve 2-3 and the 4th magnetic valve 2-4 respectively, the first magnetic valve 2-1 that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser 3, be connected with the shell-side outlet of intercooler 4 after the second magnetic valve 2-2 parallel connection that connects on every refrigeration compressor, be connected with the shell-side outlet of intercooler 4 after the 3rd magnetic valve 2-3 parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter 5 after the 4th magnetic valve 2-4 parallel connection that connects on every refrigeration compressor.The outlet of condenser 3 is connected with the pipe side-entrance of intercooler 4, and the pipe side outlet of intercooler is connected with the import of evaporimeter 5 by the second choke valve 6-2.First throttle valve 6-1 is connected between the pipe side outlet 4-1 of the shell-side inlet 4-2 of intercooler and intercooler.
The double-stage compressive refrigerating system that not exclusively cools off in the middle of the one-level throttling shown in Figure 2 can be realized single stage compress kind of refrigeration cycle and twin-stage compression refrigeration circulation.
1, single stage compress kind of refrigeration cycle:
The first magnetic valve 2-1 that is connected with each refrigeration compressor opens, and the second magnetic valve 2-2 closes, and the 3rd magnetic valve 2-3 closes, and the 4th magnetic valve 2-4 opens.For every refrigeration compressor, refrigeration compressor compresses the high-pressure refrigerant that and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1, enter through intercooler 4 that throttling is depressurized to low pressure among the choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, get back to refrigeration compressor through the 4th magnetic valve 2-4, realize the single stage compress kind of refrigeration cycle.
2, twin-stage compression refrigeration circulation:
Serve as the low-pressure stage refrigeration compressor for one or several in many refrigeration compressors and use, remaining refrigeration compressor is served as the hiigh pressure stage refrigeration compressor and is used.
Circulation in low-pressure stage refrigeration compressor part is: close with the first magnetic valve 2-1 that is connected as the low-pressure stage refrigeration compressor, the second magnetic valve 2-2 opens, the 3rd magnetic valve 2-3 closes, the 4th magnetic valve 2-4 unlatching.High-pressure refrigerant after the condenser 3 condensation heat releases enters from the pipe side-entrance of middle cooler 4, cross through heat release and to flow out from the pipe side outlet of middle cooler 4 after cold, throttling is depressurized to low pressure in the second choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, enter in the low-pressure stage refrigeration compressor through the 4th magnetic valve 2-4, the low-pressure stage refrigeration compressor compress the middle compacting cryogen that through the second magnetic valve 2-2 with export out from middle cooler 4 shell-sides the compacting cryogen be mixed into the suction end of hiigh pressure stage refrigeration compressor.
Circulation in hiigh pressure stage refrigeration compressor part is: the first magnetic valve 2-1 that is connected with the hiigh pressure stage refrigeration compressor opens, the second magnetic valve 2-2 closes, the 3rd magnetic valve 2-3 opens, the 4th magnetic valve 2-4 closes.Middle compacting cryogen is compressed to high pressure in the hiigh pressure stage refrigeration compressor, enter condensation heat release in the condenser 3 through the first magnetic valve 2-1.It is cold excessively that the high-pressure refrigerant that comes out from condenser 3 enters in the intercooler 4 heat release, and the high-pressure refrigerant that comes out from middle cooler 4 pipe side outlets is divided into two-way, and one the tunnel is depressurized to low pressure through the second choke valve 6-2 throttling enters in the evaporimeter 5; Another road enters from middle cooler 4 shell-side inlet the intercooler 4 through first throttle valve 6-1 throttling to intermediate pressure flows out from middle cooler 4 shell-sides outlet after the heat absorption, and the middle compacting cryogen of discharging with the low-pressure stage refrigeration compressor mixes after the 3rd magnetic valve 2-3 enters the hiigh pressure stage refrigeration compressor.
Fig. 3 is the middle schematic diagram of the two-stage refrigeration compressibility of cooling fully of one-level throttling, comprises many refrigeration compressors 1, condenser 3, evaporimeter 5, intercooler 4, and intercooler is the shell and tube exchanger that has liquid level.The exhaust end of every refrigeration compressor is connected with the first magnetic valve 2-1 and the second magnetic valve 2-2 respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve 2-3 and the 4th magnetic valve 2-4 respectively, the first magnetic valve 2-1 that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser 3, be connected with the liquid level below shell-side interface of intercooler 4 after the second magnetic valve 2-2 parallel connection that connects on every refrigeration compressor, be connected with the shell-side gaseous phase outlet of intercooler 4 after the 3rd magnetic valve 2-3 parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter 5 after the 4th magnetic valve 2-4 parallel connection that connects on every refrigeration compressor.The outlet of condenser 3 is connected with the pipe side-entrance of intercooler 4, and the pipe side outlet of intercooler 4 is connected with the import of evaporimeter 5 by the second choke valve 6-2.First throttle valve 6-1 is connected between the outlet of the shell-side inlet of intercooler 4 and condenser 3.
The two-stage refrigeration compressibility that cools off fully in the middle of the one-level throttling shown in Figure 3 can be realized the single stage compress kind of refrigeration cycle, also can realize twin-stage compression refrigeration circulation.
1, single stage compress kind of refrigeration cycle:
The first magnetic valve 2-1 that is connected with each refrigeration compressor opens, and the second magnetic valve 2-2 closes, and the 3rd magnetic valve 2-3 closes, and the 4th magnetic valve 2-4 opens.For every refrigeration compressor, refrigeration compressor compresses the high-pressure refrigerant that and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1, enter through intercooler 4 that throttling is depressurized to low pressure among the choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, get back to refrigeration compressor through the 4th magnetic valve 2-4, realize the single stage compress kind of refrigeration cycle.
2, twin-stage compression refrigeration circulation:
Serve as the low-pressure stage refrigeration compressor for one or several in many refrigeration compressors and use, remaining refrigeration compressor is served as the hiigh pressure stage refrigeration compressor and is used.
Circulation in low-pressure stage refrigeration compressor part is: close with the first magnetic valve 2-1 that is connected as the low-pressure stage refrigeration compressor, the second magnetic valve 2-2 opens, the 3rd magnetic valve 2-3 closes, the 4th magnetic valve 2-4 unlatching.High-pressure refrigerant after the condenser 3 condensation heat releases enters from the pipe side-entrance of middle cooler 4, cross through heat release and to flow out from the pipe side outlet of middle cooler 4 after cold, throttling is depressurized to low pressure in the second choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, enter in the low-pressure stage refrigeration compressor through the 4th magnetic valve 2-4, the low-pressure stage refrigeration compressor compresses the middle compacting cryogen that and enters intercooler 4 through the second magnetic valve 2-2 from the liquid level below shell-side interface of middle cooler 4.
Circulation in hiigh pressure stage refrigeration compressor part is: the first magnetic valve 2-1 that is connected with the hiigh pressure stage refrigeration compressor opens, the second magnetic valve 2-2 closes, the 3rd magnetic valve 2-3 opens, the 4th magnetic valve 2-4 closes.The compacting cryogen is compressed to high pressure in the hiigh pressure stage refrigeration compressor from the saturation state that the shell-side gaseous phase outlet of middle cooler 4 comes out, and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1.The high-pressure refrigerant that comes out from condenser 3 is divided into two-way, and one the road to enter the intercooler 4 heat release from the 4 pipe side-entrances of middle cooler cold excessively, is depressurized to low pressure through the second choke valve 6-2 throttling and enters in the evaporimeter 5; Another road to intermediate pressure, enters intercooler 4 heat absorption from middle cooler 4 shell-side inlet through first throttle valve 6-1 throttling.
Fig. 4 is the schematic diagram of the double-stage compressive refrigerating system of incomplete cooling in the middle of the two-step throttle, comprises many refrigeration compressors 1, condenser 3, evaporimeter 5, intercooler 4, and intercooler is the water storage type heat exchanger.The exhaust end of every refrigeration compressor is connected with the first magnetic valve 2-1 and the second magnetic valve 2-2 respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve 2-3 and the 4th magnetic valve 2-4 respectively, the first magnetic valve 2-1 that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser 3, be connected with the gaseous phase outlet of intercooler 4 after the second magnetic valve 2-2 parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler 4 after the 3rd magnetic valve 2-3 parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter 5 after the 4th magnetic valve 2-4 parallel connection that connects on every refrigeration compressor.The outlet of condenser 3 is connected with the shell-side inlet of intercooler 4 by first throttle valve 6-1, and the liquid phase outlet of intercooler 4 is connected with the import of evaporimeter 5 by the second choke valve 6-2.
The double-stage compressive refrigerating system that not exclusively cools off in the middle of the two-step throttle shown in Figure 4 can be realized the single stage compress kind of refrigeration cycle, also can realize twin-stage compression refrigeration circulation.
1, single stage compress kind of refrigeration cycle:
The first magnetic valve 2-1 that is connected with each refrigeration compressor opens, and the second magnetic valve 2-2 closes, and the 3rd magnetic valve 2-3 closes, and the 4th magnetic valve 2-4 opens.For every refrigeration compressor, refrigeration compressor compresses the high-pressure refrigerant that and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1, enter through intercooler 4 that throttling is depressurized to low pressure among the choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, get back to refrigeration compressor through the 4th magnetic valve 2-4, realize the single stage compress kind of refrigeration cycle.
2, twin-stage compression refrigeration circulation:
Serve as the low-pressure stage refrigeration compressor for one or several in many refrigeration compressors and use, remaining refrigeration compressor is served as the hiigh pressure stage refrigeration compressor and is used.
Circulation in low-pressure stage refrigeration compressor part is: close with the first magnetic valve 2-1 that is connected as the low-pressure stage refrigeration compressor, the second magnetic valve 2-2 opens, the 3rd magnetic valve 2-3 closes, the 4th magnetic valve 2-4 unlatching.High-pressure refrigerant after the condenser 3 condensation heat releases is pressed in first throttle valve 6-1 is throttled to after the shell-side inlet of intercooler 4 enters in the intercooler 4, middle hydraulic fluid phase cold-producing medium in the intercooler 4 enters evaporation heat absorption in the evaporimeter 5 through the second choke valve 6-2 throttling to low pressure, produce the refrigeration phenomenon, enter in the low-pressure stage refrigeration compressor through the 4th magnetic valve 2-4, the low-pressure stage refrigeration compressor compress the middle compacting cryogen that through the second magnetic valve 2-2 with come out from middle cooler 4 gaseous phase outlets the compacting cryogen be mixed into the suction end of hiigh pressure stage refrigeration compressor.
Circulation in hiigh pressure stage refrigeration compressor part is: the first magnetic valve 2-1 that is connected with the hiigh pressure stage refrigeration compressor opens, the second magnetic valve 2-2 closes, the 3rd magnetic valve 2-3 opens, the 4th magnetic valve 2-4 closes.Middle compacting cryogen is compressed to high pressure in the hiigh pressure stage refrigeration compressor, enter condensation heat release in the condenser 3 through the first magnetic valve 2-1.The high-pressure refrigerant that comes out from condenser 3 enters intercooler 4 after pressing from middle cooler 4 shell-side inlet in first throttle valve 6-1 is throttled to, the cold-producing medium that comes out from middle cooler 4 gaseous phase outlets and low-pressure stage refrigeration compressor discharge the compacting cryogen mix after the 3rd magnetic valve 2-3 enters the hiigh pressure stage refrigeration compressor.
Fig. 5 is the middle schematic diagram of the double-stage compressive refrigerating system of cooling fully of two-step throttle, comprises many refrigeration compressors 1, condenser 3, evaporimeter 5, intercooler 4, and intercooler is the water storage type heat exchanger.The exhaust end of every refrigeration compressor is connected with the first magnetic valve 2-1 and the second magnetic valve 2-2 respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve 2-3 and the 4th magnetic valve 2-4 respectively, the first magnetic valve 2-1 that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser 3, be connected with the liquid level below shell-side interface of intercooler 4 after the second magnetic valve 2-2 parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler 4 after the 3rd magnetic valve 2-3 parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter 5 after the 4th magnetic valve 2-4 parallel connection that connects on every refrigeration compressor.The outlet of condenser 3 is connected with the shell-side inlet of intercooler 4 by first throttle valve 6-1, and the liquid phase outlet of intercooler 4 is connected with the import of evaporimeter 5 by the second choke valve 6-2.
The double-stage compressive refrigerating system that cools off fully in the middle of the two-step throttle shown in Figure 5 can be realized the single stage compress kind of refrigeration cycle, also can realize twin-stage compression refrigeration circulation.
1, single stage compress kind of refrigeration cycle:
The first magnetic valve 2-1 that is connected with each refrigeration compressor opens, and the second magnetic valve 2-2 closes, and the 3rd magnetic valve 2-3 closes, and the 4th magnetic valve 2-4 opens.For every refrigeration compressor, refrigeration compressor compresses the high-pressure refrigerant that and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1, enter through intercooler 4 that throttling is depressurized to low pressure among the choke valve 6-2, evaporation heat absorption in evaporimeter 5, produce the refrigeration phenomenon, get back to refrigeration compressor through the 4th magnetic valve 2-4, realize the single stage compress kind of refrigeration cycle.
2, twin-stage compression refrigeration circulation:
Serve as the low-pressure stage refrigeration compressor for one or several in many refrigeration compressors and use, remaining refrigeration compressor is served as the hiigh pressure stage refrigeration compressor and is used.
Circulation in low-pressure stage refrigeration compressor part is: close with the first magnetic valve 2-1 that is connected as the low-pressure stage refrigeration compressor, the second magnetic valve 2-2 opens, the 3rd magnetic valve 2-3 closes, the 4th magnetic valve 2-4 unlatching.High-pressure refrigerant after the condenser 3 condensation heat releases is pressed in first throttle valve 6-1 is throttled to after the shell-side inlet of intercooler 4 enters in the intercooler 4, middle hydraulic fluid phase cold-producing medium in the intercooler 4 enters evaporation heat absorption in the evaporimeter 5 through the second choke valve 6-2 throttling to low pressure, produce the refrigeration phenomenon, enter in the low-pressure stage refrigeration compressor through the 4th magnetic valve 2-4, the low-pressure stage refrigeration compressor compresses the middle compacting cryogen that and enters the liquid level of intercooler 4 from middle cooler 4 liquid levels below shell-side interface through the second magnetic valve 2-2.
Circulation in hiigh pressure stage refrigeration compressor part is: the first magnetic valve 2-1 that is connected with the hiigh pressure stage refrigeration compressor opens, the second magnetic valve 2-2 closes, the 3rd magnetic valve 2-3 opens, the 4th magnetic valve 2-4 closes.The compacting cryogen is compressed to high pressure in the hiigh pressure stage refrigeration compressor from the saturation state that middle cooler 4 gaseous phase outlets come out, and enters condensation heat release in the condenser 3 through the first magnetic valve 2-1.The high-pressure refrigerant that comes out from condenser 3 enters in the intercooler 4 from middle cooler 4 shell-side inlet after pressing in first throttle valve 6-1 is throttled to.
Magnetic valve 2 of the present invention is a prior art, can replace with three-way diverter valve or four-way change-over valve.
Choke valve 6 of the present invention is a prior art, and form do not limit, and can be capillary, heating power expansion valve, electric expansion valve, also can be throttle orifice plate apparatus etc.
Claims (4)
1. the incomplete double-stage compressive refrigerating system of cooling in the middle of the one-level throttling, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the shell-side outlet of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the shell-side outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the pipe side-entrance of intercooler, and the pipe side outlet of intercooler is connected with the import of evaporimeter by second choke valve; The first throttle valve is connected between the shell-side inlet and pipe side outlet of intercooler, and perhaps the first throttle valve is connected between the outlet of the shell-side inlet of intercooler and condenser.
2. the double-stage compressive refrigerating system of cooling fully in the middle of the one-level throttling, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the liquid level below shell-side interface of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the shell-side gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the pipe side-entrance of intercooler, and the pipe side outlet of intercooler is connected with the import of evaporimeter by second choke valve; The first throttle valve is connected between the outlet of the shell-side inlet of intercooler and condenser.
3. the incomplete double-stage compressive refrigerating system of cooling in the middle of the two-step throttle, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the gaseous phase outlet of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the shell-side inlet of intercooler by the first throttle valve, and the liquid phase outlet of intercooler is connected with the import of evaporimeter by second choke valve.
4. the double-stage compressive refrigerating system of cooling fully in the middle of the two-step throttle, it is characterized in that, comprise many refrigeration compressors, condenser, evaporimeter, intercooler, the exhaust end of every refrigeration compressor is connected with first magnetic valve and second magnetic valve respectively, the suction end of every refrigeration compressor is connected with the 3rd magnetic valve and the 4th magnetic valve respectively, first magnetic valve that connects on every refrigeration compressor back that is connected in parallel is connected with the import of condenser, be connected with the liquid level below shell-side interface of intercooler after the second magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the gaseous phase outlet of intercooler after the 3rd magnetic valve parallel connection that connects on every refrigeration compressor, be connected with the outlet of evaporimeter after the 4th magnetic valve parallel connection that connects on every refrigeration compressor; The outlet of condenser is connected with the shell-side inlet of intercooler by the first throttle valve, and the liquid phase outlet of intercooler is connected with the import of evaporimeter by second choke valve.
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| CN102901278A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling complete-intercooling refrigeration system |
| CN102901261A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling incomplete-intercooling refrigeration system |
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| CN102901278A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling complete-intercooling refrigeration system |
| CN102901261A (en) * | 2012-11-12 | 2013-01-30 | 天津商业大学 | Two-stage multi-unit single-throttling incomplete-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 |
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| CN103322718A (en) * | 2013-07-04 | 2013-09-25 | 天津商业大学 | Two-stage-throttling incomplete-intercooling double-duty refrigerating system |
| CN105387645A (en) * | 2015-12-17 | 2016-03-09 | 重庆美的通用制冷设备有限公司 | Water chilling unit and control method thereof |
| CN105758048A (en) * | 2016-05-03 | 2016-07-13 | 天津商业大学 | Variable-flow single-working medium cascade refrigeration system with parallel condensers and parallel evaporators |
| CN105758047A (en) * | 2016-05-03 | 2016-07-13 | 天津商业大学 | Variable-flow single-working medium cascade refrigeration system with common condenser and common evaporator |
| CN105758049A (en) * | 2016-05-03 | 2016-07-13 | 天津商业大学 | Variable-flow single-working medium cascade heat pump system with parallel heat exchangers |
| CN105783326A (en) * | 2016-05-03 | 2016-07-20 | 天津商业大学 | Variable-flow single-working-medium sharing heat exchanger overlapping heat pump system |
| CN105758047B (en) * | 2016-05-03 | 2019-01-22 | 天津商业大学 | The cascade refrigeration system of variable-flow either simplex matter common condenser and evaporator |
| CN105758048B (en) * | 2016-05-03 | 2018-07-20 | 天津商业大学 | The cascade refrigeration system of variable-flow either simplex matter parallel condensing device and evaporator |
| CN105758049B (en) * | 2016-05-03 | 2018-07-20 | 天津商业大学 | Variable-flow either simplex matter heat exchangers in parallel overlapping heat pump system |
| CN105783326B (en) * | 2016-05-03 | 2019-01-22 | 天津商业大学 | Variable-flow either simplex matter common heat exchanger overlapping heat pump system |
| CN108253655A (en) * | 2018-03-21 | 2018-07-06 | 天津商业大学 | Variable-flow single stage compress cycle and the heat pump system of two-stage compression cycle can be achieved |
| CN108592435A (en) * | 2018-03-21 | 2018-09-28 | 天津商业大学 | The refrigeration system of variable-flow single stage compress cycle and two-stage compression cycle can be achieved |
| CN108592435B (en) * | 2018-03-21 | 2024-02-23 | 天津商业大学 | Refrigerating system capable of realizing variable flow single-stage compression cycle and double-stage compression cycle |
| CN108253655B (en) * | 2018-03-21 | 2024-03-01 | 天津商业大学 | Heat pump system capable of realizing variable flow single-stage compression cycle and double-stage compression cycle |
| CN108731310A (en) * | 2018-06-06 | 2018-11-02 | 珠海格力电器股份有限公司 | Four-way reversing valve group, fluid reversing system, air-conditioning and the hot method of air conditioner refrigerating |
| CN109210814A (en) * | 2018-10-10 | 2019-01-15 | 天津商业大学 | A kind of multifunction refrigeration system |
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