CN113654256A - Single-compressor dual-system precise temperature control system suitable for factory cooling water - Google Patents

Single-compressor dual-system precise temperature control system suitable for factory cooling water Download PDF

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Publication number
CN113654256A
CN113654256A CN202110954633.6A CN202110954633A CN113654256A CN 113654256 A CN113654256 A CN 113654256A CN 202110954633 A CN202110954633 A CN 202110954633A CN 113654256 A CN113654256 A CN 113654256A
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China
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liquid
expansion valve
electronic expansion
compressor
temperature control
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CN202110954633.6A
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Chinese (zh)
Inventor
顾佳星
金鑫
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Hefei Yiwei Technology Co ltd
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Hefei Yiwei Technology Co ltd
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Priority to CN202110954633.6A priority Critical patent/CN113654256A/en
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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
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • 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
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/003—Filters
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention relates to the technical field of plant cooling water, in particular to a single-compressor dual-system precise temperature control system suitable for the plant cooling water, which comprises: the system comprises a plant cooling water system, a compressor refrigerant refrigerating system, a Channel1 circulating liquid system and a Channel2 circulating liquid system which form a precise temperature control system; the compressor refrigerant refrigeration system comprises a compressor, a high-low pressure switch, a second electronic expansion valve, a fourth electronic expansion valve, a condenser, a second filter, a first liquid viewing mirror, a third electronic expansion valve, a first electronic expansion valve, a fifth electronic expansion valve, a first evaporator, a second evaporator and a gas-liquid separator which are sequentially connected. The invention solves the problems of multiple and complex pipelines, high energy consumption, increased water flow requirement and high cost of the double refrigeration systems, greatly reduces the pipelines of the internal refrigerant system, can effectively reduce the difficulty of welding and installing the pipelines and finally reduces the risk of leakage in the welding of the refrigerant system.

Description

Single-compressor dual-system precise temperature control system suitable for factory cooling water
Technical Field
The invention relates to the technical field of plant cooling water, in particular to a single-compressor dual-system precise temperature control system suitable for plant cooling water.
Background
As shown in the attached drawing 1 of the specification, in order to implement dual-system temperature control of Channel1 and Channel2 in the prior art, two sets of the same refrigeration systems (one set in zone 1 and one set in zone 2) are designed in the refrigeration system in a matching manner, and the defects of the design scheme are as follows:
1. due to the fact that the number of pipelines is large and the number of the pipelines is complex, difficulty in pipeline welding and installation can be caused, and leakage points can be easily caused in welding of a refrigerant system.
2. The dual refrigeration system has more components (dual compressors, dual condensers, dual filters, dual pressure switches, etc.) due to the increased number of pipes, resulting in an increased volume of the final device, which may result in excessive floor space for the end user when installed.
3. The double-refrigeration system has the double-compressor system, so that the energy consumption is increased, and the energy cannot be effectively saved in a green way.
4. The double-refrigeration system has the double-compressor system, and meanwhile, the requirement of the required normal service cooling water flow is increased, the requirement on the service water of the end user is high, and the occupation ratio of the service water of the end user is excessively used.
5. The dual refrigeration system has increased cost of the final forming apparatus due to the increased number of components (dual compressors, dual condensers, dual filters, dual pressure switches, dual compressor electrical control system components, etc.) due to the increased number of circuits.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a single-compressor dual-system precise temperature control system suitable for factory cooling water, and solves the problems of multiple and complex pipelines, high energy consumption, increased water flow requirement and high cost of a dual-refrigeration system, so that the pipelines of an internal refrigerant system are reduced far by adopting the single-compressor dual-circulation liquid temperature control system, the difficulty in pipeline welding and installation can be effectively reduced, and the risk of leakage in the welding of the refrigerant system is finally reduced.
(II) technical scheme
In order to solve the technical problems, the invention provides the following technical scheme: a single compressor dual system precision temperature control system for plant cooling water, comprising: the system comprises a plant cooling water system, a compressor refrigerant refrigerating system, a Channel1 circulating liquid system and a Channel2 circulating liquid system which form a precise temperature control system;
the compressor refrigerant refrigeration system comprises a compressor, a high-low pressure switch, a second electronic expansion valve, a fourth electronic expansion valve, a condenser, a second filter, a first liquid viewing mirror, a third electronic expansion valve, a first electronic expansion valve, a fifth electronic expansion valve, a first evaporator, a second evaporator and a gas-liquid separator which are connected in sequence;
the high-low pressure switch and the second electronic expansion valve are sequentially connected at the outlet of the compressor, and the second filter and the first electronic expansion valve are sequentially connected at the outlet of the condenser;
the outlets of the first electronic expansion valve and the second electronic expansion valve form a collecting point and are connected with the inlet of the first evaporator;
a fourth electronic expansion valve is branched at the inlet of the second electronic expansion valve, and a fifth electronic expansion valve is branched at the inlet of the first electronic expansion valve;
the outlets of the fourth electronic expansion valve and the fifth electronic expansion valve form a collecting point and are connected with the inlet of the second evaporator.
Furthermore, the inlet and outlet of the factory cooling water system, the Channel1 circulating liquid system and the Channel2 circulating liquid system are connected with a liquid leakage floating ball through pipelines, and the capacity of triggering an alarm system is achieved when the refrigerant leaks in the temperature control system.
Further, a first temperature sensor is arranged at the outlet of the first evaporator and the inlet of the gas-liquid separator.
Furthermore, a refrigerant filling opening is formed in the outlet of the condenser and the inlet of the second filter, and a refrigerant overhauling opening is formed in the outlet of the first evaporator and the inlet of the gas-liquid separator.
Further, the plant cooling water system comprises a first filter and a condenser which are connected in sequence;
the Channel1 circulating liquid system comprises a third filter, a first flowmeter, a first evaporator, a first heating wire barrel, a fourth filter, a first water pump, a first pressure gauge, a second temperature sensor and a first hand valve which are sequentially connected;
the Channel2 circulating liquid system comprises a fifth filter, a second flowmeter, a second evaporator, a second heating wire barrel, a sixth filter, a second water pump, a second pressure gauge, a third temperature sensor and a second hand valve which are sequentially connected.
Further, a first high-temperature protection switch, a first low-temperature protection switch and a first heating wire are arranged in the first heating wire barrel;
a first liquid supplementing water tank is arranged at the position of the first heating wire barrel, a second liquid viewing mirror is arranged on the first liquid supplementing water tank, and a first low liquid level floating ball and a first extremely low liquid level floating ball are arranged in the first liquid supplementing water tank.
Furthermore, an inlet and an outlet of the Channel1 circulating liquid system are connected with a first Bypass hand valve in parallel through a pipeline, and a first drainage hand valve is arranged at the inlet of the Channel1 circulating liquid system.
Furthermore, a second high-temperature protection switch, a second low-temperature protection switch and a second heating wire are arranged in the second heating wire barrel;
and a second liquid supplementing water tank is arranged at the position of the second heating wire barrel, a second liquid viewing mirror is arranged on the second liquid supplementing water tank, and a second low liquid level floating ball and a second polar low liquid level floating ball are arranged in the second liquid supplementing water tank.
Furthermore, a second Bypass hand valve is connected in parallel at the inlet and the outlet of the Channel2 circulating liquid system through a pipeline, and a second liquid drainage hand valve is arranged at the inlet of the Channel2 circulating liquid system.
(III) advantageous effects
The invention provides a single-compressor dual-system precise temperature control system suitable for plant cooling water, which has the following beneficial effects:
1. energy saving
When the invention is in normal operation, only a single compressor is arranged and the temperature of the circulating liquid of the double systems can be synchronously controlled, thus the invention can effectively save energy and reduce the use cost of the electric quantity of a user compared with the double refrigeration systems of the double compressors.
When the system operates normally, only the single compressor operates, so that the requirement on the flow rate of the plant cooling water is lower than that of a double-refrigeration system with double compressors, and the occupation ratio of the plant cooling water of a final user can be effectively reduced.
2. Stabilization
The refrigeration system of the invention is a temperature control system of the single-compressor double-circulation liquid, so that the pipelines of the internal refrigerant system are reduced far, the difficulty of pipeline welding and installation can be effectively reduced, and the risk of leakage in the welding of the refrigerant system is finally reduced.
The refrigeration system of the invention synchronously adds the first temperature sensor at the air return position of the compressor, when the temperature of the circulating liquid is less than 20 ℃, the microcomputer control system detects the first temperature sensor and controls the opening degree of the third electronic expansion valve, so that the air return temperature of the detection part of the first temperature sensor is always kept within 20 +/-5 ℃, thereby ensuring the normal air return temperature of the compressor.
3. High space utilization rate and optimized cost
The invention discloses a single-compressor double-precision temperature control system, which comprises: reduce a large amount of pipelines than traditional two compressor refrigerating system, reduce the part simultaneously: only 1 compressor, 1 condenser, 1 filter, 1 pressure switch, 1 compressor electrical control system part etc. are needed to greatly reduced the area of equipment, reduced the material cost of equipment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of a dual-system temperature control system for implementing Channel1 and Channel2 in the prior art;
FIG. 2 is a schematic diagram of a precise temperature control system of a single compressor dual system for plant cooling water according to the present invention.
In the figure: 1. a first filter; 2. a condenser; 3. a liquid leakage floating ball; 4. a compressor; 5. a high-low voltage switch; 6. a refrigerant inlet; 7. a second filter; 8. a first liquid sight glass; 9. a first electronic expansion valve; 10. a second electronic expansion valve; 11. a third electronic expansion valve; 12. a fourth electronic expansion valve; 13. a fifth electronic expansion valve; 14. a refrigerant access hole; 15. a first temperature sensor; 16. a gas-liquid separator;
1-1, a third filter; 1-2, a first flow meter; 1-3, a first evaporator; 1-4, a first heating wire barrel; 1-5, a first high-temperature protection switch; 1-6, a first low-temperature protection switch; 1-7, a first heating wire; 1-8, a first liquid supplementing water tank; 1-9, a second liquid sight lens; 1-10, a first low liquid level floating ball; 1-11, a first extremely low liquid level floating ball; 1-12, a fourth filter; 1-13, a first water pump; 1-14, a first pressure gauge; 1-15, a first Bypass hand valve; 1-16, a second temperature sensor; 1-17, a first hand valve; 1-18, a first drain hand valve;
2-1, a fifth filter; 2-2, a second flow meter; 2-3, a second evaporator; 2-4, a second heating wire barrel; 2-5, a second high-temperature protection switch; 2-6, a second low-temperature protection switch; 2-7, a second heating wire; 2-8, a second liquid supplementing water tank; 2-9, a third liquid sight glass; 2-10, a second low liquid level floating ball; 2-11, a second pole low liquid level floating ball; 2-12, a sixth filter; 2-13, a second water pump; 2-14, a second pressure gauge; 2-15, a second Bypass hand valve; 2-16, a third temperature sensor; 2-17, a second hand valve; 2-18 and a second liquid discharge hand valve.
Detailed Description
Embodiments of the present application will be described in detail with reference to the drawings and examples, so that how to implement technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
FIGS. 1-2 illustrate an embodiment of the present invention: a single compressor dual system precision temperature control system for plant cooling water, comprising: the system comprises a plant cooling water system, a compressor refrigerant refrigerating system, a Channel1 circulating liquid system and a Channel2 circulating liquid system which jointly form a precise temperature control system;
the compressor refrigerant refrigeration system comprises a compressor 4, a high-low pressure switch 5, a second electronic expansion valve 10, a fourth electronic expansion valve 12, a condenser 2, a second filter 7, a first liquid viewing mirror 8, a third electronic expansion valve 11, a first electronic expansion valve 9, a fifth electronic expansion valve 13, a first evaporator 1-3, a second evaporator 2-3 and a gas-liquid separator 16 which are connected in sequence;
the high-low pressure switch 5 and the second electronic expansion valve 10 are sequentially connected at the outlet of the compressor 4, and the second filter 7 and the first electronic expansion valve 9 are sequentially connected at the outlet of the condenser 2;
the outlets of the first electronic expansion valve 9 and the second electronic expansion valve 10 form a collecting point and are connected with the inlets of the first evaporators 1-3;
a fourth electronic expansion valve 12 is branched at the inlet of the second electronic expansion valve 10, and a fifth electronic expansion valve 13 is branched at the inlet of the first electronic expansion valve 9;
the outlets of the fourth electronic expansion valve 12 and the fifth electronic expansion valve 13 form a collecting point and are connected to the inlet of the second evaporator 2-3.
The refrigerant firstly passes through the compressor 4, the compressor 4 compresses the refrigerant into high-temperature and high-pressure gas, a small branch flows to the high-low pressure switch 5 and detects the pressure of the refrigerant at the moment, and one branch flows to a CH1 first electronic expansion valve (hot gas)9 and a CH2 fourth electronic expansion valve (hot gas) 12; the other path flows into a condenser 2, and after heat exchange with plant cooling water in the condenser 2, normal-temperature and high-pressure liquid flows out of the condenser 2.
After passing through the second filter 7 to filter impurities in the refrigerant and the first liquid viewing mirror 8 and observing the flow of the refrigerant, one path of the refrigerant flows to the CH1 first electronic expansion valve (main)9, passes through the interception function of the CH1 first electronic expansion valve (main)9 (reducing the pressure of the refrigerant and adjusting the flow rate of the refrigerant), is changed into low-temperature and low-pressure liquid, and is neutralized with the refrigerant flowing through the CH1 second electronic expansion valve (hot gas)10 and then flows to the first evaporator 1-3.
The refrigerant exchanges heat with the CH1 circulating liquid in the first evaporator 1-3, and the cold energy absorbed by the CH1 circulating liquid is changed into low-pressure gas; the refrigerant flows down to a CH2 fifth electronic expansion valve (main)13 from the other path at the rear end of the first liquid viewing mirror 8, is changed into low-temperature and low-pressure liquid by the interception action (reducing the pressure of the refrigerant and adjusting the flow rate of the refrigerant) of the CH2 fifth electronic expansion valve (main)13, is neutralized with the refrigerant flowing through a CH2 fourth electronic expansion valve (hot gas)12, flows to the second evaporator 2-3, exchanges heat with the CH2 circulating liquid in the second evaporator 2-3, is changed into low-pressure gas by the cooling energy absorbed by the CH2 circulating liquid, and flows up to the third electronic expansion valve (injection)11 from the other path at the rear end of the liquid viewing mirror 10.
When the circulating liquid of CH1 or CH2 is higher than 20 ℃, the third electronic expansion valve (injection)11 is opened, the refrigerant flows through the interception function of the third electronic expansion valve (injection)11 (the pressure of the refrigerant is reduced, the flow rate of the refrigerant is adjusted), the refrigerant is changed into low-temperature low-pressure liquid, the low-temperature low-pressure liquid is neutralized with the refrigerant flowing out of the CH1 first evaporator 1-3 and the CH2 second evaporator 2-3, the temperature of the refrigerant is about 20 +/-5 ℃, the refrigerant then flows to the high-low pressure switch 5 to detect the pressure of the refrigerant, the refrigerant then flows through the gas-liquid separator 16 to separate gas and liquid refrigerants to protect the compressor, liquid impact is prevented, finally the refrigerant flows into the compressor 4, the compressor 4 does work to change the low-temperature low-pressure refrigerant gas into high-temperature high-pressure gas, and the cycle work is carried out.
Because only one compressor controls the temperature of the two systems precisely, the microcomputer processing system analyzes and matches (the first electronic expansion valve 9, the second electronic expansion valve 10, the third electronic expansion valve 11, the fourth electronic expansion valve 12 and the fifth electronic expansion valve 13) to regulate the opening degree in a PID way, thereby realizing stable temperature control effect.
Because the single-compressor double-precision temperature control system only has one compressor for precisely controlling the temperature of the double systems, the temperature of the circulating liquid of the Channel1 circulating liquid system Channel and the temperature of the circulating liquid of the Channel2 circulating liquid system can deviate greatly in actual use, and the instability of the return air temperature of the compressor can be caused. Therefore, the present invention adds a first temperature sensor 15 to the return air of the compressor for detecting the return air temperature of the compressor. When the temperature of the circulating liquid is lower than 20 ℃, the microcomputer control system detects the first temperature sensor 15 and controls the opening degree of the third electronic expansion valve 11, so that the return air temperature of the detection part of the first temperature sensor 15 is always kept within 20 +/-5 ℃, the normal return air temperature of the compressor is ensured, and the compressor is protected finally to operate stably.
The Channel1 circulating liquid system is briefly described as CH1, and the Channel2 circulating liquid system is briefly described as CH 2.
CH1 temperature control: according to the temperature set value of CH1 circulating liquid SV, the maximum opening values of a CH1 first electronic expansion valve (main)9 and a CH1 second electronic expansion valve (hot gas)10 are preliminarily set, then a microcomputer processing system analyzes and matches a temperature control system, PID algorithm control is carried out on the opening degrees of the 2 electronic expansion valves at the same time, and PID algorithm control is carried out on the compressor frequency and the percentage of a heating wire in a matching manner, so that the temperature control requirement is met.
CH2 temperature control: according to the temperature set value of CH2 circulating liquid SV, the maximum opening values of a CH2 fifth electronic expansion valve (main)13 and a CH1 fourth electronic expansion valve (hot gas)12 are preliminarily set, then a microcomputer processing system analyzes and matches a temperature control system, PID algorithm control is carried out on the opening degrees of the 2 electronic expansion valves at the same time, and PID algorithm control is carried out on the compressor frequency and the percentage of a heating wire in a matching manner, so that the temperature control requirement is met.
When the temperature is controlled by CH1 and CH2, the return air temperature of the compressor is monitored by a first temperature sensor 15, and when PV is more than 20 ℃, a third electronic expansion valve (injection)11 is controlled by a microcomputer to ensure that the return air temperature of the compressor is 20 +/-5 ℃.
The inlet and outlet of the factory cooling water system, the Channel1 circulating liquid system and the Channel2 circulating liquid system are connected with a liquid leakage floating ball 3 through pipelines, and the capacity of triggering an alarm system is achieved when the refrigerant leaks in the temperature control system, so that the system is reminded of the leakage phenomenon, and the whole temperature control system is protected.
A first temperature sensor 15 is arranged at the outlet of the first evaporator 1-3 and the inlet of the gas-liquid separator 16.
Refrigerant filling ports 6 are arranged at the outlet of the condenser 2 and the inlet of the second filter 7, and refrigerant inspection ports 14 are arranged at the outlet of the first evaporator 1-3 and the inlet of the gas-liquid separator 16.
The plant cooling water system comprises a first filter 1 and a condenser 2 which are sequentially connected, plant cooling water flow enters the condenser 2 through the filter 1, the plant cooling water exchanges heat with a refrigerant, and the plant cooling water carries away heat in the refrigerant and then returns to a return water system of the plant cooling water;
the Channel1 circulating liquid system comprises a third filter 1-1, a first flowmeter 1-2, a first evaporator 1-3, a first heating wire barrel 1-4, a fourth filter 1-12, a first water pump 1-13, a first pressure gauge 1-14, a second temperature sensor 1-16 and a first hand valve 1-17 which are sequentially connected.
The circulating liquid of the client flows through the third filter 1-1 and the first flow meter 1-2 and flows to the CH1 first evaporator 1-3, the circulating liquid exchanges heat with the refrigerant in the CH1 first evaporator 1-3, and the circulating liquid absorbs the cold energy of the refrigerant and cools the refrigerant. After the temperature is reduced, the circulating liquid flows into the first heating wire barrels 1-4, after circulating fluid temperature signals are collected by the second temperature sensors 1-16, the microcomputer processing system analyzes and matches the output frequency of the first heating wires 1-7 in the temperature control system to finely adjust the temperature of the circulating fluid, and therefore the accurate temperature control value +/-0.1 ℃ of the target circulating fluid is achieved. Finally, the circulating liquid with stable temperature control is supplied to the client equipment after flowing through a fourth filter 1-12, a first water pump 1-13 (circulating liquid circulating power), a first pressure sensor 1-14 (detecting circulating liquid pressure), a second temperature sensor 1-16 (detecting circulating liquid temperature) and a first hand valve 1-17;
the Channel2 circulating liquid system comprises a fifth filter 2-1, a second flowmeter 2-2, a second evaporator 2-3, a second heating wire barrel 2-4, a sixth filter 2-12, a second water pump 2-13, a second pressure gauge 2-14, a third temperature sensor 2-16 and a second hand valve 2-17 which are connected in sequence.
The circulating liquid flow of the client side flows to a CH2 second evaporator 2-3 through a fifth filter 2-1 and a second flowmeter 2-2, the circulating liquid exchanges heat with the refrigerant in the CH2 second evaporator 2-3, and the circulating liquid absorbs the cold energy of the refrigerant to cool. After the temperature is reduced, the circulating liquid flows into the second heating wire barrel 2-4, after circulating fluid temperature signals are collected by the third temperature sensor 2-16, the microcomputer processing system analyzes and matches the output frequency of the second heating wire 2-7 in the temperature control system to finely adjust the temperature of the circulating fluid, and therefore the accurate temperature control value +/-0.1 ℃ of the target circulating fluid is achieved. And finally, the circulating liquid with stable temperature control is supplied to the client equipment after passing through a sixth filter 2-12, a second water pump 2-13 (circulating liquid circulating power), a second pressure sensor 2-14 (detecting circulating liquid pressure), a third temperature sensor 2-16 (detecting circulating liquid temperature) and a second hand valve 2-17.
The first heating wire barrel 1-4 is internally provided with a first high-temperature protection switch 1-5, a first low-temperature protection switch 1-6 and a first heating wire 1-7;
a first liquid supplementing water tank 1-8 is arranged at the position of the first heating wire barrel 1-4, a second liquid viewing mirror 1-9 is arranged on the first liquid supplementing water tank 1-8, and a first low liquid level floating ball 1-10 and a first extremely low liquid level floating ball 1-11 are arranged in the first liquid supplementing water tank 1-8.
The inlet and the outlet of the Channel1 circulating liquid system are connected in parallel with first Bypass hand valves 1-15 through pipelines, and the inlet of the Channel1 circulating liquid system is provided with first drainage hand valves 1-18.
A second high-temperature protection switch 2-5, a second low-temperature protection switch 2-6 and a second heating wire 2-7 are arranged in the second heating wire barrel 2-4;
a second liquid supplementing water tank 2-8 is arranged at the position of the second heating wire barrel 2-4, a second liquid viewing mirror 2-9 is arranged on the second liquid supplementing water tank 2-8, and a second low liquid level floating ball 2-10 and a second polar low liquid level floating ball 2-11 are arranged in the second liquid supplementing water tank 2-8.
And the inlet and the outlet of the Channel2 circulating liquid system are connected in parallel with second Bypass hand valves 2-15 through pipelines, and the inlet of the Channel2 circulating liquid system is provided with second liquid discharge hand valves 2-18.
When the air conditioner works, a refrigerant firstly passes through the compressor 4, the compressor 4 compresses the refrigerant into high-temperature and high-pressure gas, a small branch flows to the high-low pressure switch 5 and detects the pressure of the refrigerant at the moment, and one branch flows to the CH1 first electronic expansion valve (hot gas)9 and the CH2 fourth electronic expansion valve (hot gas) 12; the other path flows into a condenser 2, and after heat exchange with plant cooling water in the condenser 2, normal-temperature and high-pressure liquid flows out of the condenser 2.
After passing through the second filter 7 to filter impurities in the refrigerant and the first liquid viewing mirror 8 and observing the flow of the refrigerant, one path of the refrigerant flows to the CH1 first electronic expansion valve (main)9, passes through the interception function of the CH1 first electronic expansion valve (main)9 (reducing the pressure of the refrigerant and adjusting the flow rate of the refrigerant), is changed into low-temperature and low-pressure liquid, and is neutralized with the refrigerant flowing through the CH1 second electronic expansion valve (hot gas)10 and then flows to the first evaporator 1-3.
The refrigerant exchanges heat with the CH1 circulating liquid in the first evaporator 1-3, and the cold energy absorbed by the CH1 circulating liquid is changed into low-pressure gas; the refrigerant flows down to a CH2 fifth electronic expansion valve (main)13 from the other path at the rear end of the first liquid viewing mirror 8, is changed into low-temperature and low-pressure liquid by the interception action (reducing the pressure of the refrigerant and adjusting the flow rate of the refrigerant) of the CH2 fifth electronic expansion valve (main)13, is neutralized with the refrigerant flowing through a CH2 fourth electronic expansion valve (hot gas)12, flows to the second evaporator 2-3, exchanges heat with the CH2 circulating liquid in the second evaporator 2-3, is changed into low-pressure gas by the cooling energy absorbed by the CH2 circulating liquid, and flows up to the third electronic expansion valve (injection)11 from the other path at the rear end of the liquid viewing mirror 10.
When the circulating liquid of CH1 or CH2 is higher than 20 ℃, the third electronic expansion valve (injection)11 is opened, the refrigerant flows through the interception function of the third electronic expansion valve (injection)11 (the pressure of the refrigerant is reduced, the flow rate of the refrigerant is adjusted), the refrigerant is changed into low-temperature low-pressure liquid, the low-temperature low-pressure liquid is neutralized with the refrigerant flowing out of the CH1 first evaporator 1-3 and the CH2 second evaporator 2-3, the temperature of the refrigerant is about 20 +/-5 ℃, the refrigerant then flows to the high-low pressure switch 5 to detect the pressure of the refrigerant, the refrigerant then flows through the gas-liquid separator 16 to separate gas and liquid refrigerants to protect the compressor, liquid impact is prevented, finally the refrigerant flows into the compressor 4, the compressor 4 does work to change the low-temperature low-pressure refrigerant gas into high-temperature high-pressure gas, and the cycle work is carried out.
Meanwhile, the opening degree of the electronic expansion valve is the opening degree which is most matched with the temperature control and calculated by the microcomputer processing system analysis matching temperature control system.
Working principle of CH1 circulating liquid system: the circulating liquid of the client flows through the third filter 1-1 and the first flow meter 1-2 and flows to the CH1 first evaporator 1-3, the circulating liquid exchanges heat with the refrigerant in the CH1 first evaporator 1-3, and the circulating liquid absorbs the cold energy of the refrigerant and cools the refrigerant. After the temperature is reduced, the circulating liquid flows into the first heating wire barrels 1-4, after circulating fluid temperature signals are collected by the second temperature sensors 1-16, the microcomputer processing system analyzes and matches the output frequency of the first heating wires 1-7 in the temperature control system to finely adjust the temperature of the circulating fluid, and therefore the accurate temperature control value +/-0.1 ℃ of the target circulating fluid is achieved. And finally, the circulating liquid with stable temperature control is supplied to client equipment after passing through a fourth filter 1-12, a first water pump 1-13 (circulating liquid circulating power), a first pressure sensor 1-14 (detecting circulating liquid pressure), a second temperature sensor 1-16 (detecting circulating liquid temperature) and a first hand valve 1-17.
Working principle of CH2 circulating liquid system: the circulating liquid flow of the client side flows to a CH2 second evaporator 2-3 through a fifth filter 2-1 and a second flowmeter 2-2, the circulating liquid exchanges heat with the refrigerant in the CH2 second evaporator 2-3, and the circulating liquid absorbs the cold energy of the refrigerant to cool. After the temperature is reduced, the circulating liquid flows into the second heating wire barrel 2-4, after circulating fluid temperature signals are collected by the third temperature sensor 2-16, the microcomputer processing system analyzes and matches the output frequency of the second heating wire 2-7 in the temperature control system to finely adjust the temperature of the circulating fluid, and therefore the accurate temperature control value +/-0.1 ℃ of the target circulating fluid is achieved. And finally, the circulating liquid with stable temperature control is supplied to the client equipment after passing through a sixth filter 2-12, a second water pump 2-13 (circulating liquid circulating power), a second pressure sensor 2-14 (detecting circulating liquid pressure), a third temperature sensor 2-16 (detecting circulating liquid temperature) and a second hand valve 2-17.
Meanwhile, circulating liquids in the first liquid supplementing water tank 1-8 and the second liquid supplementing water tank 2-8 do not participate in temperature control circulation, and the circulating liquids have the following functions: when the circulating liquid participating in temperature control is short, the circulating liquid is supplemented.
The invention relates to an internal protection system of a single-compressor double-precision temperature control system, which comprises the following components:
when the flow rates of the first flow meter 1-2 and the second flow meter 2-2 are lower than the target value, the temperature control system corresponding to the flow meters stops running, otherwise, the cold energy generated by the compressor cannot be taken away and is damaged.
Circulating liquid, a first high-temperature protection switch 1-5 and a second high-temperature protection switch 2-5, a first low-temperature protection switch 1-6 and a second low-temperature protection switch 2-6: and the damage to the circulating system caused by overhigh or overlow temperature of the circulating liquid is prevented, and the temperature control system corresponding to the high-low temperature sensor stops running.
The first pressure gauge 1-14 and the second pressure gauge 2-14 measure the pressure of the circulating liquid, and the pressure is transmitted to the microcomputer processing system through the sensor to be compared with the highest or lowest value set by the client, if the highest or lowest value exceeds the upper or lower limit of the set value, the corresponding circulating liquid system warning or the temperature control system can be set to stop running.
When the low liquid level floating balls 1-10 and 2-10 are triggered, a warning can be set to prompt a user to add circulating liquid; when the extremely-low liquid level floating balls 1-11 and 2-11 are triggered, an alarm can be set, so that the corresponding circulating liquid system is prevented from causing equipment failure due to no circulating liquid, and the temperature control system stops running.
The high-low pressure switch 5 is provided with protection parameters, when the pressure of the refrigerant is larger than or smaller than the protection parameters set by the high-low pressure switch 5, the temperature control system stops running, otherwise, the compressor is damaged.
The circulating fluid system also includes a drain line including hand valves 1-18 and 2-18.
The invention has the following beneficial effects:
1. energy saving
When the invention is in normal operation, only a single compressor is arranged and the temperature of the circulating liquid of the double systems can be synchronously controlled, thus the invention can effectively save energy and reduce the use cost of the electric quantity of a user compared with the double refrigeration systems of the double compressors.
When the system operates normally, only the single compressor operates, so that the requirement on the flow rate of the plant cooling water is lower than that of a double-refrigeration system with double compressors, and the occupation ratio of the plant cooling water of a final user can be effectively reduced.
2. Stabilization
The refrigeration system of the invention is a temperature control system of the single-compressor double-circulation liquid, so that the pipelines of the internal refrigerant system are reduced far, the difficulty of pipeline welding and installation can be effectively reduced, and the risk of leakage in the welding of the refrigerant system is finally reduced.
The refrigeration system of the invention synchronously adds the first temperature sensor at the air return position of the compressor, when the temperature of the circulating liquid is less than 20 ℃, the microcomputer control system detects the first temperature sensor and controls the opening degree of the third electronic expansion valve, so that the air return temperature of the detection part of the first temperature sensor is always kept within 20 +/-5 ℃, thereby ensuring the normal air return temperature of the compressor.
3. High space utilization rate and optimized cost
The invention discloses a single-compressor double-precision temperature control system, which comprises: reduce a large amount of pipelines than traditional two compressor refrigerating system, reduce the part simultaneously: only 1 compressor, 1 condenser, 1 filter, 1 pressure switch, 1 compressor electrical control system part etc. are needed to greatly reduced the area of equipment, reduced the material cost of equipment.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a precision temperature control system of single compressor dual system suitable for factory's affairs cooling water which characterized in that includes: the system comprises a plant cooling water system, a compressor refrigerant refrigerating system, a Channel1 circulating liquid system and a Channel2 circulating liquid system which form a precise temperature control system;
the compressor refrigerant refrigeration system comprises a compressor (4), a high-low pressure switch (5), a second electronic expansion valve (10), a fourth electronic expansion valve (12), a condenser (2), a second filter (7), a first liquid sight glass (8), a third electronic expansion valve (11), a first electronic expansion valve (9), a fifth electronic expansion valve (13), a first evaporator (1-3), a second evaporator (2-3) and a gas-liquid separator (16) which are connected in sequence;
a high-low pressure switch (5) and a second electronic expansion valve (10) are sequentially connected at the outlet of the compressor (4), and a second filter (7) and a first electronic expansion valve (9) are sequentially connected at the outlet of the condenser (2);
the outlets of the first electronic expansion valve (9) and the second electronic expansion valve (10) form a collection point and are connected with the inlets of the first evaporators (1-3);
a fourth electronic expansion valve (12) is branched at the inlet of the second electronic expansion valve (10), and a fifth electronic expansion valve (13) is branched at the inlet of the first electronic expansion valve (9);
the outlets of the fourth electronic expansion valve (12) and the fifth electronic expansion valve (13) form a collecting point and are connected with the inlet of the second evaporator (2-3).
2. The precise temperature control system of single-compressor dual-system for plant cooling water as claimed in claim 1, wherein: the inlet and outlet of the factory cooling water system, the Channel1 circulating liquid system and the Channel2 circulating liquid system are connected with a liquid leakage floating ball (3) through pipelines, and the capacity of triggering an alarm system is achieved when the refrigerant leaks in the temperature control system.
3. The precise temperature control system of single-compressor dual-system for plant cooling water as claimed in claim 1, wherein: a first temperature sensor (15) is arranged at the outlet of the first evaporator (1-3) and the inlet of the gas-liquid separator (16).
4. The precise temperature control system of single-compressor dual-system for plant cooling water as claimed in claim 1, wherein: refrigerant injection ports (6) are arranged at the outlet of the condenser (2) and the inlet of the second filter (7), and refrigerant overhaul ports (14) are arranged at the outlet of the first evaporator (1-3) and the inlet of the gas-liquid separator (16).
5. The precise temperature control system of single-compressor dual-system for plant cooling water as claimed in claim 1, wherein: the plant cooling water system comprises a first filter (1) and a condenser (2) which are connected in sequence;
the Channel1 circulating liquid system comprises a third filter (1-1), a first flowmeter (1-2), a first evaporator (1-3), a first heating wire barrel (1-4), a fourth filter (1-12), a first water pump (1-13), a first pressure gauge (1-14), a second temperature sensor (1-16) and a first hand valve (1-17) which are connected in sequence;
the Channel2 circulating liquid system comprises a fifth filter (2-1), a second flowmeter (2-2), a second evaporator (2-3), a second heating wire barrel (2-4), a sixth filter (2-12), a second water pump (2-13), a second pressure gauge (2-14), a third temperature sensor (2-16) and a second hand valve (2-17) which are connected in sequence.
6. The precise temperature control system of claim 5, wherein the system comprises a single compressor and a double system, and the system is characterized in that: a first high-temperature protection switch (1-5), a first low-temperature protection switch (1-6) and a first heating wire (1-7) are arranged in the first heating wire barrel (1-4);
a first liquid supplementing water tank (1-8) is arranged at the position of the first heating wire barrel (1-4), a second liquid viewing mirror (1-9) is arranged on the first liquid supplementing water tank (1-8), and a first low liquid level floating ball (1-10) and a first extremely low liquid level floating ball (1-11) are arranged in the first liquid supplementing water tank (1-8).
7. The precise temperature control system of single-compressor dual system for plant cooling water as claimed in claim 1 or 5, wherein: the inlet and the outlet of the Channel1 circulating liquid system are connected in parallel with first Bypass hand valves (1-15) through pipelines, and the inlet of the Channel1 circulating liquid system is provided with first drainage hand valves (1-18).
8. The precise temperature control system of claim 5, wherein the system comprises a single compressor and a double system, and the system is characterized in that: a second high-temperature protection switch (2-5), a second low-temperature protection switch (2-6) and a second heating wire (2-7) are arranged in the second heating wire barrel (2-4);
a second liquid supplementing water tank (2-8) is arranged at the second heating wire barrel (2-4), a second liquid viewing mirror (2-9) is arranged on the second liquid supplementing water tank (2-8), and a second low liquid level floating ball (2-10) and a second pole low liquid level floating ball (2-11) are arranged in the second liquid supplementing water tank (2-8).
9. The precise temperature control system of single-compressor dual system for plant cooling water as claimed in claim 1 or 5, wherein: and a second Bypass hand valve (2-15) is connected in parallel at the inlet and the outlet of the Channel2 circulating liquid system through a pipeline, and a second liquid discharge hand valve (2-18) is arranged at the inlet of the Channel2 circulating liquid system.
CN202110954633.6A 2021-08-19 2021-08-19 Single-compressor dual-system precise temperature control system suitable for factory cooling water Pending CN113654256A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011190977A (en) * 2010-03-15 2011-09-29 Orion Machinery Co Ltd Controller for temperature-controlled bath
CN204182270U (en) * 2014-11-10 2015-03-04 苏州赛弗尔机械有限公司 Condensing hot air furnace freezing type drier
CN111023606A (en) * 2019-12-27 2020-04-17 无锡溥汇机械科技有限公司 Large-flow small-temperature-difference precise temperature control heat exchange system
CN212720356U (en) * 2020-07-02 2021-03-16 江苏拓米洛环境试验设备有限公司 Refrigerating system of multi-box test box
CN112611140A (en) * 2020-12-18 2021-04-06 北京京仪自动化装备技术有限公司 Temperature control device and method
CN112964022A (en) * 2021-04-14 2021-06-15 合肥亦威科技有限公司 Precise temperature control system suitable for factory cooling water

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011190977A (en) * 2010-03-15 2011-09-29 Orion Machinery Co Ltd Controller for temperature-controlled bath
CN204182270U (en) * 2014-11-10 2015-03-04 苏州赛弗尔机械有限公司 Condensing hot air furnace freezing type drier
CN111023606A (en) * 2019-12-27 2020-04-17 无锡溥汇机械科技有限公司 Large-flow small-temperature-difference precise temperature control heat exchange system
CN212720356U (en) * 2020-07-02 2021-03-16 江苏拓米洛环境试验设备有限公司 Refrigerating system of multi-box test box
CN112611140A (en) * 2020-12-18 2021-04-06 北京京仪自动化装备技术有限公司 Temperature control device and method
CN112964022A (en) * 2021-04-14 2021-06-15 合肥亦威科技有限公司 Precise temperature control system suitable for factory cooling water

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