CN114484929B - Dual-unit combined refrigerating system and method for environment simulation cabin - Google Patents

Dual-unit combined refrigerating system and method for environment simulation cabin Download PDF

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CN114484929B
CN114484929B CN202111629912.1A CN202111629912A CN114484929B CN 114484929 B CN114484929 B CN 114484929B CN 202111629912 A CN202111629912 A CN 202111629912A CN 114484929 B CN114484929 B CN 114484929B
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way valve
interface
adjusting
port
unit
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CN114484929A (en
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王瑞祥
程利峰
刘怀印
王盛楠
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China Academy of Aerospace Aerodynamics CAAA
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China Academy of Aerospace Aerodynamics CAAA
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
    • F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves

Abstract

The invention discloses a double-unit combined refrigeration system and method for an environment simulation cabin, comprising the following steps: the device comprises a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit; the secondary refrigerant outlet end of the heat exchanger is connected with the first interface of the first three-way valve, and the secondary refrigerant inlet end of the heat exchanger is connected with the first interface of the second three-way valve; the second interface of the first three-way valve is connected with the input end of the cryogenic unit, and the output end of the cryogenic unit is connected with the second interface of the second three-way valve; the third interface of the first three-way valve is connected with the input end of the common cooling unit, and the output end of the common cooling unit is connected with the third interface of the second three-way valve and the input end of the cryogenic unit; the system forms serial-parallel combined refrigeration with the common cooling unit and the cryogenic unit through the first three-way valve and the second three-way valve, so that the temperature regulation and control of the environment simulation cabin are simple and flexible, the regulation and control precision is high, the operation of the two units is more reasonable, the utilization rate of energy sources is improved, and the cost is saved.

Description

Dual-unit combined refrigerating system and method for environment simulation cabin
Technical Field
The invention belongs to the technical field of environment simulation cabin refrigeration, and particularly relates to a double-unit combined refrigeration system and method for an environment simulation cabin.
Background
The large-scale environment simulation cabin is generally used for providing the required environment simulation for the tested equipment, wherein a plurality of pairs of temperature indexes are marked in the actual natural environment, and the common temperature range is between-20 ℃ and 40 ℃. Therefore, the environment simulation cabin needs to be provided with a complete set of heating and refrigerating systems, wherein the refrigerating systems consist of refrigerating units, and sufficient cooling capacity is output at each temperature of the environment simulation cabin, so that the environment in the cabin is cooled or heat generated by equipment in the cabin is balanced.
According to the use condition, the conventional temperature range in the environment simulation cabin is divided into: high temperature (60 ℃ more than or equal to T_c more than or equal to 40 ℃), normal temperature (40 ℃ more than or equal to T_c more than 10 ℃), low temperature (10 ℃ more than or equal to T_c > -20 ℃) and deep cooling (-20 ℃ more than or equal to T_c > -40 ℃). The high temperature region and the normal temperature region need to be equipped with a common refrigerating unit (the temperature of the secondary refrigerant is as low as about 5-12 ℃) for refrigerating, and the low temperature region needs to be equipped with a deep refrigerating unit (the temperature of the secondary refrigerant is as low as-45 ℃).
The conventional environment simulation cabin can adopt two refrigerating units for refrigeration aiming at the above conditions so as to maintain the temperature in the cabin stable, so that the two units of the common refrigerating unit and the deep refrigerating unit are matched with each other to regulate and control the temperature in the environment simulation cabin. The existing regulation and control mode is complicated in regulation and control, poor in regulation and control precision and low in energy utilization rate.
Disclosure of Invention
The invention aims at overcoming the defects in the prior art, and provides a double-unit combined refrigerating system and method for an environment simulation cabin.
In order to achieve the above object, the present invention provides a dual-unit combined refrigeration system for an environmental simulation cabin, the system comprising:
the device comprises a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit; the secondary refrigerant outlet end of the heat exchanger is connected with the first interface of the first three-way valve, and the secondary refrigerant inlet end of the heat exchanger is connected with the first interface of the second three-way valve; the second interface of the first three-way valve is connected with the input end of the cryogenic unit, and the output end of the cryogenic unit is connected with the second interface of the second three-way valve; the third interface of the first three-way valve is connected with the input end of the common cooling unit, and the output end of the common cooling unit is connected with the third interface of the second three-way valve and the input end of the cryogenic unit.
Optionally, the second port of the first three-way valve is connected with the input end of the cryogenic unit through a first pipeline, and a first check valve is arranged on the first pipeline.
Optionally, the output end of the common cooling unit is connected with a third interface of the second three-way valve through a second pipeline, and a second check valve is arranged on the second pipeline.
Optionally, the environment simulation system further comprises a temperature sensor and a control unit, wherein the temperature sensor is arranged in the environment simulation cabin, and the control unit is connected with the temperature sensor, the first three-way valve and the second three-way valve.
The invention also provides a double-unit combined refrigeration method for the environment simulation cabin, which is based on the double-unit combined refrigeration system for the environment simulation cabin, and comprises the following steps:
providing a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit;
the method comprises the steps that a secondary refrigerant outlet end of a heat exchanger is connected with a first interface of a first three-way valve, a secondary refrigerant inlet end of the heat exchanger is connected with a first interface of a second three-way valve, a second interface of the first three-way valve is connected with an input end of a cryogenic unit, an output end of the cryogenic unit is connected with a second interface of the second three-way valve, a third interface of the first three-way valve is connected with an input end of a general cooling unit, and an output end of the general cooling unit is connected with a third interface of the second three-way valve and is connected with an input end of the cryogenic unit;
and obtaining a plurality of refrigeration modes by adjusting the first three-way valve and the second three-way valve.
Optionally, the plurality of refrigeration modes includes: shutdown mode, normal cooling mode, cryogenic mode, and combined mode.
Optionally, obtaining the shutdown mode by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve and the second interface of the second three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
Optionally, obtaining the common cooling mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the third port of the second three-way valve to a fully opened state, and adjusting the second port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state with a first set proportion, and the third interface of the first three-way valve is adjusted to an open state with a second set proportion;
and adjusting the first interface of the second three-way valve and the third interface of the second three-way valve to a fully opened state, and adjusting the second interface of the second three-way valve to a fully closed state.
Optionally, obtaining the cryogenic mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve to a full-open state, adjusting the second interface of the second three-way valve to an open state of a third set proportion, and adjusting the third interface of the second three-way valve to an open state of a fourth set proportion.
Optionally, obtaining the joint mode by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
the first interface of the second three-way valve is adjusted to be in a full-open state, the second interface of the second three-way valve is adjusted to be in an open state with a fifth set proportion, and the third interface of the second three-way valve is adjusted to be in an open state with a sixth set proportion; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state of a seventh set proportion, and the third interface of the first three-way valve is adjusted to an open state of an eighth set proportion;
and adjusting the first interface of the second three-way valve and the second interface of the first three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
The invention provides a double-unit combined refrigeration system and a method for an environment simulation cabin, which have the beneficial effects that:
1. the system forms serial-parallel combined refrigeration of the common cooling unit and the cryogenic unit through the first three-way valve and the second three-way valve, has simple and flexible regulation and control and high regulation and control precision, can ensure that the two units run more reasonably, and improves the utilization rate of energy sources;
2. according to the method, the shutdown mode, the general cooling mode, the deep cooling mode and the combined mode which are required by different working conditions can be flexibly and accurately obtained through adjustment of the first three-way valve and the second three-way valve; the temperature range in the environment simulation cabin which can be regulated and controlled by the system is enlarged to-45-60 ℃, and the system has a large-span temperature change range; the device is improved from one machine to multiple purposes, and the energy efficiency of the machine set is improved; the double-machine single-use is improved to double-machine sharing, and the refrigeration efficiency is improved; the unit and the refrigeration mode can be continuously switched, and the working condition requirements are accurately met.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular descriptions of exemplary embodiments of the invention as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic diagram of a dual unit combined refrigeration system for an environmental simulation pod according to one embodiment of the present invention.
FIG. 2 shows a schematic diagram of PID piping of a dual-unit combined refrigeration system for an environmental simulation pod according to an embodiment of the invention.
FIG. 3 illustrates a schematic diagram of a dual unit combined refrigeration method for an environmental simulation pod in which a shutdown mode is obtained in accordance with one embodiment of the present invention.
Fig. 4 shows a schematic diagram of a cooling mode obtained in a double-unit combined refrigeration method for an environmental simulation pod according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of a cooling mode obtained in a double-unit combined cooling method for an environmental simulation pod according to an embodiment of the present invention.
FIG. 6 illustrates a schematic diagram of a dual unit combined refrigeration method for an environmental simulation pod for obtaining a cryogenic mode according to an embodiment of the invention.
FIG. 7 shows a schematic diagram of obtaining a cryogenic mode in a dual unit combined refrigeration method for an environmental simulation pod according to one embodiment of the invention.
FIG. 8 shows a schematic diagram of a method for obtaining a combined mode in a double-unit combined refrigeration method for an environmental simulation pod according to one embodiment of the invention.
FIG. 9 shows a schematic diagram of a method for obtaining a combined mode in a double-unit combined refrigeration method for an environmental simulation pod according to one embodiment of the invention.
FIG. 10 shows a schematic diagram of a method for obtaining a combined mode in a double-unit combined refrigeration method for an environmental simulation pod according to one embodiment of the invention.
Reference numerals illustrate:
1. a heat exchanger; 2. a first three-way valve; 3. a second three-way valve; 4. a common cooling unit; 5. a cryogenic unit; 6. a first port of a first three-way valve; 7. a first port of a second three-way valve; 8. a second port of the first three-way valve; 9. a second port of the second three-way valve; 10. a third port of the first three-way valve; 11. a third port of the second three-way valve; 12. a first pipeline; 13. a first check valve; 14. a second pipeline; 15. a second check valve; 16. a third pipeline; 17. a first pressure sensor; 18. a first temperature sensor; 19. a fourth pipeline; 20. a second pressure sensor; 21. a second temperature sensor; 22. a fifth pipeline; 23. driving a pump; 24. a third pressure sensor; 25. a third temperature sensor; 26. a sixth pipeline; 27. a fourth pressure sensor; 28. a fourth temperature sensor; 29. a fifth pressure sensor; 30. a fifth temperature sensor; 31. a seventh pipeline; 32. a sixth pressure sensor; 33. and a sixth temperature sensor.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As shown in fig. 1 and 2, the present invention provides a dual-unit combined refrigeration system for an environmental simulation cabin, the system comprising:
the heat exchanger 1, the first three-way valve 2, the second three-way valve 3, the common cooling unit 4 and the cryogenic unit 5; the coolant outlet end of the heat exchanger 1 is connected with a first interface 6 of a first three-way valve, and the coolant inlet end of the heat exchanger 1 is connected with a first interface 7 of a second three-way valve; the second interface 8 of the first three-way valve is connected with the input end of the cryogenic unit, and the output end of the cryogenic unit is connected with the second interface 9 of the second three-way valve; the third interface 10 of the first three-way valve is connected with the input end of the common cooling unit, and the output end of the common cooling unit is connected with the third interface 11 of the second three-way valve and the input end of the cryogenic unit.
Specifically, the common cooling unit 4 and the deep cooling unit 5 are formed into serial-parallel combined refrigeration through the first three-way valve 2 and the second three-way valve 3, the regulation and control are simple and flexible, the regulation and control precision is high, the operation of the two units is more reasonable, and the energy utilization rate is improved. The different refrigeration modes of the environment simulation cabin are regulated and controlled by adjusting the first three-way valve 2 and the second three-way valve 3, and can directly correspond to different temperature ranges of the environment simulation cabin. The first three-way valve 2 and the second three-way valve 3 are respectively set as V1 and V2, the opening degree of the V1 and the V2 is between 0 and 100 percent, and the feedback signals are the temperatures of the corresponding environment simulation cabins under PID control (PID control or PID regulation for short based on the control law of a regulator of proportion, integration and differentiation).
Further, according to the actual operation and regulation results of each device in the system, the system has the functions shown in table 1 and corresponds to 4 working conditions of a required refrigeration mode, including a shutdown mode, a normal cooling mode, a deep cooling mode and a combined mode.
TABLE 1 comparison of percent opening of three-way valve for refrigeration mode
Wherein A1, B1 and C1 are respectively a first interface 6 of the first three-way valve, a second interface 8 of the first three-way valve and a third interface 10 of the first three-way valve, and A2, B2 and C2 are respectively a first interface 7 of the second three-way valve, a second interface 9 of the second three-way valve and a third interface 11 of the second three-way valve.
In this embodiment, the first three-way valve 2 and the second three-way valve 3 are both pneumatic valves.
Optionally, the second port 8 of the first three-way valve is connected to the input of the cryogenic unit via a first line 12, and the first line 12 is provided with a first check valve 13.
Optionally, the output end of the common cooling unit is connected with the third port 11 of the second three-way valve through a second pipeline 14, and a second check valve 15 is arranged on the second pipeline 14.
Optionally, the environment simulation system further comprises a temperature sensor and a control unit, wherein the temperature sensor is arranged in the environment simulation cabin, and the control unit is connected with the temperature sensor, the first three-way valve 2 and the second three-way valve 3.
Specifically, control programs corresponding to the refrigeration modes are arranged in the control unit, the system can be automatically controlled to be switched to the corresponding refrigeration mode by selecting the corresponding control program, and the temperature condition in the environment simulation cabin can be monitored according to the temperature signal fed back by the temperature sensor.
In the embodiment, not only the connection of main equipment is performed according to the table 1, but also various sensors, control logic and pumps required by specific debugging operation are added; the coolant outlet end of the heat exchanger 1 is connected with the first interface 6 of the first three-way valve through a third pipeline 16, and a first pressure sensor 17 and a first temperature sensor 18 are arranged on the third pipeline 16; the third interface 10 of the first three-way valve is connected with the input end of the common cooling unit through a fourth pipeline 19, and a second pressure sensor 20 and a second temperature sensor 21 are arranged on the fourth pipeline 19; the output end of the common cooling unit is connected with the input end of the cryogenic unit through a fifth pipeline 22, a driving pump 23 is arranged on the fifth pipeline 22, and a third pressure sensor 24 and a third temperature sensor 25 are arranged on one side of the driving pump 23, which is close to the common cooling unit, on the fifth pipeline 22; the output end of the cryogenic unit is connected with the second interface 9 of the second three-way valve through a sixth pipeline 26, and a fourth pressure sensor 27 and a fourth temperature sensor 28 are arranged on the sixth pipeline 26; a fifth pressure sensor 29 and a fifth temperature sensor 30 are arranged on the side, close to the cryogenic unit, of the driving pump 23 on the fifth pipeline 22; the coolant inlet of the heat exchanger 1 is connected to the first port 7 of the second three-way valve by a seventh line 31, the seventh line 31 being provided with a sixth pressure sensor 32 and a sixth temperature sensor 33.
Specifically, as shown in fig. 2, in order to ensure that the system operates properly in the modes shown in table 1, proper setting and selection of pump parameters is required to ensure that normal pressure differentials are maintained between the various sections of tubing. The selection of the pump requires that the static pressure in the pipeline is maintained at 0.2MPa, and the pump is arranged at the upstream of the refrigerating unit and used for balancing the resistance loss of the refrigerating medium passing through the refrigerating unit. The reference pressure relationship for the selection of the pump head is: p2> p5> p3> p4> p6≡p1, wherein p1=0.2 to 0.3MPa is recommended. Meanwhile, the two check valves can effectively avoid the backflow phenomenon of the pipeline secondary refrigerant when the state changes. In order to ensure that the system can operate correctly according to the modes in table 1, the corresponding operating conditions need to be selected correctly according to the temperature of the environmental simulation cabin, table 2 shows the corresponding operating conditions when the environmental simulation cabin is at each temperature of [ -40 ℃,60 ℃), and the corresponding temperature of the coolant is about [ -45 ℃,65 ℃).
TABLE 2 comparison of the operating temperatures of the systems
Sequence number Mode T1 T2 T3 T4 T5 T6
1 Shutdown —— —— —— —— —— ——
2 General cooling (45℃，65℃] ≈T1 T2-ΔT 1 —— —— ≈T3
3 General cooling (35℃，45℃] ≈T1 T2-ΔT 1 —— —— (T3，T1)
4 Cryogenic cooling (-50℃，-42℃] —— —— T1-ΔT 2 ≈T1 ≈T4
5 Cryogenic cooling (-42℃，5℃] —— —— T1-ΔT 2 ≈T1 (T4，T1)
6 Combination of (25℃，35℃] ≈T1 T1-ΔT 1 T5-ΔT 2 ≈T3 ≈T4
7 Combination of (5℃，12℃] ≈T1 T1-ΔT 1 T5-ΔT 2 ≈T3 (T4，T3)
8 Combination of (12℃，25℃] ≈T1 T1-ΔT 1 T5-ΔT 2 (T3，T1) ≈T4
In Table 2, the lowest temperature of the coolant outlet end of the common cooling unit is set to be 5 ℃, the lowest temperature of the coolant outlet end of the deep cooling unit is set to be-45 ℃,meanwhile, the parameter is the optimal choice for simultaneously considering performance and economy according to actual debugging. Deltat in table 2 1 For the temperature difference delta T of the coolant at the coolant outlet and inlet ends of the common cooling unit 2 Is the temperature difference of the refrigerating medium at the outlet end and the inlet end of the cryogenic unit, and delta T 1 And DeltaT 2 Always greater than 0.
In summary, the double-unit combined refrigeration system for the environmental simulation cabin provided by the invention can flexibly switch serial, parallel and single-unit operation, thereby covering the temperature range of the environmental simulation cabin [ -45 ℃ and 60 ℃; the cryogenic unit 5 can be started in advance to participate in refrigeration under the working conditions of normal temperature and even high temperature (the refrigerating medium is 35 ℃), so that the refrigerating capacity at the corresponding temperature is improved by nearly 1 time; the outlet temperature and power of the common cooling unit 4 can be adjusted by adjusting the first three-way valve 2 and the second three-way valve 3, so that the common cooling unit 4 does not need a continuous adjusting function, and the design and customization cost of the unit can be saved; the temperature T6 of the heat source which is transmitted to the environment simulation cabin can be continuously regulated, so that the stable temperature difference between the temperature of the environment simulation cabin and the temperature T6 is maintained, and therefore, the temperature stability of the whole range can be accurately controlled by only 1 set of PID parameters.
As shown in fig. 3 to 10, the present invention further provides a dual-unit combined refrigeration method for an environmental simulation cabin, based on the dual-unit combined refrigeration system for an environmental simulation cabin, the method includes:
providing a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit;
the method comprises the steps that a secondary refrigerant outlet end of a heat exchanger is connected with a first interface of a first three-way valve, a secondary refrigerant inlet end of the heat exchanger is connected with a first interface of a second three-way valve, a second interface of the first three-way valve is connected with an input end of a cryogenic unit, an output end of the cryogenic unit is connected with a second interface of the second three-way valve, a third interface of the first three-way valve is connected with an input end of a general cooling unit, and an output end of the general cooling unit is connected with a third interface of the second three-way valve and is connected with an input end of the cryogenic unit;
and obtaining a plurality of refrigeration modes by adjusting the first three-way valve and the second three-way valve.
Specifically, the method connects the common cooling unit and the cryogenic unit through the first three-way valve and the second three-way valve which are continuously regulated, so that the system has the advantages of a series-connection and parallel-connection combined refrigerating system, the low-temperature performance of the system is further improved, and the design and use cost is reduced.
Optionally, the plurality of cooling modes includes: shutdown mode, normal cooling mode, cryogenic mode, and combined mode.
Optionally, obtaining the shutdown mode by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve and the second interface of the second three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
Specifically, as shown in fig. 3, when the first three-way valve and the second three-way valve are adjusted to the mode number 1 in table 1, the opening corresponding to the shutdown mode is not entered into any unit, and the coolant only circulates in the pipeline, at this time, any refrigerating unit cannot be started, and the system is suitable for the standby stage of the system.
Optionally, obtaining the common cooling mode by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the third port of the second three-way valve to a fully opened state, and adjusting the second port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state with a first set proportion, and the third interface of the first three-way valve is adjusted to an open state with a second set proportion;
and adjusting the first interface of the second three-way valve and the third interface of the second three-way valve to a fully opened state, and adjusting the second interface of the second three-way valve to a fully closed state.
Specifically, as shown in fig. 4, when the first three-way valve and the second three-way valve are adjusted to the mode number 2 in table 1, the opening corresponding to the common cooling mode is set, the refrigerating medium can completely pass through the common cooling unit, then the diameter of the refrigerating medium flows back to the heat exchanger, the cryogenic unit does not participate in refrigeration, and the refrigerating unit is suitable for refrigeration when the temperature of the cabin and the refrigerating medium is higher; as shown in fig. 5, when the first three-way valve and the second three-way valve are adjusted to the mode number 3 corresponding to the cooling mode in table 1, the opening corresponding to the cooling mode is set, and the coolant enters the cooling unit according to the opening of the first three-way valve V1 in a corresponding proportion, and then merges with other coolants which do not enter the cooling unit, and flows back to the heat exchanger, the cooling unit does not participate in cooling, and the cooling unit is suitable for cooling when the temperatures of the cabin and the coolants are higher. Because V1 is continuously adjustable, the output cold quantity and the temperature of the common cooling unit can be properly controlled by adjusting flow distribution, thereby achieving the effect of controlling the power of the system. As can be seen from practical debugging experiments, in one example, the rated condition of the cooling unit is adjusted within the range of v1=20±20%, corresponding to the opening degree of the valve v1=20% (i.e., b1=20%, c1=80%).
Optionally, obtaining the cryogenic mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve to a full-open state, adjusting the second interface of the second three-way valve to an open state of a third set proportion, and adjusting the third interface of the second three-way valve to an open state of a fourth set proportion.
Specifically, as shown in fig. 6, when the first three-way valve and the second three-way valve are adjusted to the mode number 4 in table 1, the opening corresponding to the cryogenic mode is set, the refrigerating medium can completely pass through the cryogenic unit, then the diameter of the refrigerating medium flows back to the heat exchanger, the common cooling unit does not participate in refrigeration, and the refrigerating unit is suitable for refrigeration when the temperature of the cabin and the refrigerating medium is extremely low. As shown in fig. 7, when the first three-way valve and the second three-way valve are adjusted to the mode number 5 corresponding to the cryogenic mode in table 1, the opening corresponding to the cryogenic mode is set, and the coolant enters the cryogenic unit according to the opening of the second three-way valve V2 in a corresponding proportion, and then merges with other coolants which do not enter the cryogenic unit, and then flows back to the heat exchanger, the cooling unit does not participate in cooling, and the method is suitable for cooling when the temperatures of the cabin and the coolants are extremely low. Because V2 is continuously adjustable, the output cold quantity and the temperature of the cryogenic unit can be properly controlled by adjusting flow distribution, thereby achieving the effect of controlling the system power. As can be seen from practical debugging experiments, in one example, the rated condition of the cryogenic unit is adjusted to correspond to the opening of the valve v2=80% (i.e. b2=80%, c2=20%) and then to be within v2=80±20%.
Optionally, obtaining the joint mode by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
the first interface of the second three-way valve is adjusted to be in a full-open state, the second interface of the second three-way valve is adjusted to be in an open state with a fifth set proportion, and the third interface of the second three-way valve is adjusted to be in an open state with a sixth set proportion; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state of a seventh set proportion, and the third interface of the first three-way valve is adjusted to an open state of an eighth set proportion;
and adjusting the first interface of the second three-way valve and the second interface of the first three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
Specifically, as shown in fig. 8, when the first three-way valve and the second three-way valve are adjusted to the mode number 6 in table 1, and the opening corresponding to the combined mode is set, the refrigerating medium can completely pass through the common cooling unit, then enter the deep cooling unit, finally flow back to the heat exchanger, and the common cooling unit and the deep cooling unit are not involved in refrigeration at all, so that the refrigerating system is suitable for refrigeration when the temperatures of the cabin and the refrigerating medium are low or in the cooling process. As shown in fig. 9, when the first three-way valve and the second three-way valve are adjusted to the mode number 7 in table 1, and the opening corresponding to the combined mode is set, the coolant enters the cryogenic unit according to the opening of the second three-way valve V2 in a corresponding proportion, then merges with other coolants which do not enter the cryogenic unit, and flows back to the heat exchanger, and the common cooling unit completely participates in refrigeration, so that the refrigerating unit is suitable for refrigeration when the temperature of the cabin and the coolants is low or in the cooling process. Because V2 is continuously adjustable, the output cold quantity and the temperature of the cryogenic unit can be properly controlled by adjusting flow distribution, thereby achieving the effect of controlling the system power. As can be seen from practical debugging experiments, in one example, the rated condition of the cryogenic unit is adjusted to correspond to the opening of the valve v2=80% (i.e. b2=80%, c2=20%) and then to be within v2=80±20%. As shown in fig. 10, when the first three-way valve and the second three-way valve are adjusted to the mode number 8 in table 1, and the opening corresponding to the combined mode is set, the coolant enters the common cooling unit according to the opening of the first three-way valve V1 in a corresponding proportion, and then merges with other coolants which do not enter the common cooling unit, the cryogenic unit completely participates in refrigeration, and then flows back to the heat exchanger, so that the coolant cooling device is suitable for refrigeration in a cabin and a coolant cooling process. Because V1 is continuously adjustable, the output cold quantity and the temperature of the common cooling unit can be properly controlled by adjusting flow distribution, thereby achieving the effect of controlling the power of the system. As can be seen from practical debugging experiments, in one example, the rated condition of the cooling unit is adjusted within the range of v1=20±20%, corresponding to the opening degree of the valve v1=20% (i.e., b1=20%, c1=80%).
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.

Claims (5)

1. A dual-unit combined refrigeration system for an environmental simulation cabin, the system comprising:
the device comprises a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit; the secondary refrigerant outlet end of the heat exchanger is connected with the first interface of the first three-way valve, and the secondary refrigerant inlet end of the heat exchanger is connected with the first interface of the second three-way valve; the second interface of the first three-way valve is connected with the input end of the cryogenic unit, and the output end of the cryogenic unit is connected with the second interface of the second three-way valve; the third interface of the first three-way valve is connected with the input end of the common cooling unit, and the output end of the common cooling unit is connected with the third interface of the second three-way valve and the input end of the cryogenic unit;
the second port of the first three-way valve is connected with the input end of the cryogenic unit through a first pipeline, and a first check valve is arranged on the first pipeline;
the output end of the common cooling unit is connected with a third interface of a second three-way valve through a second pipeline, and a second check valve is arranged on the second pipeline;
the opening degree of the first three-way valve and the second three-way valve is between 0 and 100 percent;
the temperature sensor is arranged in the environment simulation cabin, and the control unit is connected with the temperature sensor, the first three-way valve and the second three-way valve;
the first three-way valve and the second three-way valve are adjusted to switch between serial, parallel and single-unit operation, so that multiple refrigeration modes are obtained;
the plurality of cooling modes includes: a shutdown mode, a normal cooling mode, a deep cooling mode and a combined mode;
acquiring a joint pattern by adjusting the first three-way valve and the second three-way valve includes:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
the first interface of the second three-way valve is adjusted to be in a full-open state, the second interface of the second three-way valve is adjusted to be in an open state with a fifth set proportion, and the third interface of the second three-way valve is adjusted to be in an open state with a sixth set proportion; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state of a seventh set proportion, and the third interface of the first three-way valve is adjusted to an open state of an eighth set proportion;
and adjusting the first interface of the second three-way valve and the second interface of the first three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
2. A dual-unit combined refrigeration method for an environmental simulation cabin based on the dual-unit combined refrigeration system for the environmental simulation cabin according to claim 1, which is characterized by comprising the following steps:
providing a heat exchanger, a first three-way valve, a second three-way valve, a common cooling unit and a cryogenic unit;
the method comprises the steps that a secondary refrigerant outlet end of a heat exchanger is connected with a first interface of a first three-way valve, a secondary refrigerant inlet end of the heat exchanger is connected with a first interface of a second three-way valve, a second interface of the first three-way valve is connected with an input end of a cryogenic unit, an output end of the cryogenic unit is connected with a second interface of the second three-way valve, a third interface of the first three-way valve is connected with an input end of a general cooling unit, and an output end of the general cooling unit is connected with a third interface of the second three-way valve and is connected with an input end of the cryogenic unit;
and obtaining a plurality of refrigeration modes by adjusting the first three-way valve and the second three-way valve.
3. The method of two-unit combined cooling for an environmental simulation pod according to claim 2, wherein obtaining a shutdown mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve and the second interface of the second three-way valve to a fully opened state, and adjusting the third interface of the second three-way valve to a fully closed state.
4. The method of claim 2, wherein obtaining a common cooling mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the third port of the first three-way valve to a fully opened state, and adjusting the second port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the third port of the second three-way valve to a fully opened state, and adjusting the second port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
the first interface of the first three-way valve is adjusted to a full-open state, the second interface of the first three-way valve is adjusted to an open state with a first set proportion, and the third interface of the first three-way valve is adjusted to an open state with a second set proportion;
and adjusting the first interface of the second three-way valve and the third interface of the second three-way valve to a fully opened state, and adjusting the second interface of the second three-way valve to a fully closed state.
5. The method of claim 2, wherein obtaining a cryogenic mode by adjusting the first three-way valve and the second three-way valve comprises:
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
adjusting the first port of the second three-way valve and the second port of the second three-way valve to a fully opened state, and adjusting the third port of the second three-way valve to a fully closed state; or alternatively, the first and second heat exchangers may be,
adjusting the first port of the first three-way valve and the second port of the first three-way valve to a fully opened state, and adjusting the third port of the first three-way valve to a fully closed state;
and adjusting the first interface of the second three-way valve to a full-open state, adjusting the second interface of the second three-way valve to an open state of a third set proportion, and adjusting the third interface of the second three-way valve to an open state of a fourth set proportion.
CN202111629912.1A 2021-12-28 2021-12-28 Dual-unit combined refrigerating system and method for environment simulation cabin Active CN114484929B (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1145578A (en) * 1981-10-29 1983-05-03 Ernest Muench Low temperature fail-safe cascade cooling apparatus
KR20120101296A (en) * 2011-02-15 2012-09-13 가부시키가이샤 고베 세이코쇼 Two-stage screw compression type refrigerating device
CN110440505A (en) * 2019-06-27 2019-11-12 合肥通用机械研究院有限公司 A kind of wind-tunnel temperature control system of Two-way Cycle refrigerating medium Collaborative Control
CN113418316A (en) * 2021-06-08 2021-09-21 瀚润联合高科技发展（北京）有限公司 Injection enthalpy-increasing water cooling air-cooled heat pump module unit

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1145578A (en) * 1981-10-29 1983-05-03 Ernest Muench Low temperature fail-safe cascade cooling apparatus
KR20120101296A (en) * 2011-02-15 2012-09-13 가부시키가이샤 고베 세이코쇼 Two-stage screw compression type refrigerating device
CN110440505A (en) * 2019-06-27 2019-11-12 合肥通用机械研究院有限公司 A kind of wind-tunnel temperature control system of Two-way Cycle refrigerating medium Collaborative Control
CN113418316A (en) * 2021-06-08 2021-09-21 瀚润联合高科技发展（北京）有限公司 Injection enthalpy-increasing water cooling air-cooled heat pump module unit

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