CN108895697A - A kind of compression condensation system of refrigerating capacity step-less adjustment - Google Patents
A kind of compression condensation system of refrigerating capacity step-less adjustment Download PDFInfo
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- CN108895697A CN108895697A CN201810360343.7A CN201810360343A CN108895697A CN 108895697 A CN108895697 A CN 108895697A CN 201810360343 A CN201810360343 A CN 201810360343A CN 108895697 A CN108895697 A CN 108895697A
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- 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
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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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/19—Pumping down refrigerant from one part of the cycle to another part of the cycle, e.g. when the cycle is changed from cooling to heating, or before a defrost cycle is started
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to compression condensation system regions, and in particular to a kind of compression condensation system of refrigerating capacity step-less adjustment, the compression condensation system include compression condensation part, system self-adaption part, transfiguration adjusting part and measurement control section；The system self-adaption part includes the cooling valve module of air-breathing and hot-gas bypass valve module, the cooling valve module of the air-breathing adjusts part with condenser, transfiguration and is connected by pipeline, the hot-gas bypass valve module adjusts part with oil, transfiguration and is connected by pipeline, and the cooling valve module of the air-breathing, hot-gas bypass valve module pass through pipeline and be connected with gas-liquid separator.The beneficial effects of the invention are as follows：The present invention provides a kind of compression condensation system of refrigerating capacity step-less adjustment, and the control to list expansion valve and relevant parameter is completed by Measurement and Control System, realizes the stepless adjustable of cooling system amount on the basis of the reliable and stable operation of guarantee system.
Description
Technical field
The invention belongs to compression condensation system regions, and in particular to a kind of compression condensation system of refrigerating capacity step-less adjustment.
Background technique
Traditional refrigeration air-conditioner properties of product experimental rig, generallys use the compressor of fixed capacity, then uses Adjustable Capacity
The electric heating of amount liquidates to cooling capacity, constant to reach the temperature between experimental enviroment.This way is due to that will use electricity to add
Heat offsets the refrigerating capacity of compressor, is bound to cause the waste of energy.To overcome this problem it is preferable to way be energy
Refrigeration duty and thermic load needed for realizing between environment are all that can individually carry out step-less adjustment, when between environment being refrigeration duty
Electric heating only need to be put into, the balance required horsepower adjuster driving electric heating of refrigeration duty can be solved, the program is difficult
Point is the balance to thermic load, needs to carry out stepless adjusting to the refrigerating capacity of system.
Mainly there are variable frequency adjustment technology, multi-machine parallel connection transfiguration technology, liquid system in terms of varying capacity adjusting both at home and abroad at present
Cryogen stores transfiguration technology, and latter two mode is not suitable for promoting in refrigeration air-conditioner experimental rig, frequency conversion due to control accuracy difference
Though it is high that regulation technology controls precision, its higher cost, control is complex, is also unfavorable for large-scale promotion, for this purpose, opening herein
A kind of compression condensation system is issued, is able to achieve to refrigerating capacity from zero to step-less adjustment at full capacity.The system introduces hot-gas bypass
Valve, the valve member of air-breathing cooling expansion valve and electric expansion valve and some other auxiliary are completed pair by automatic control system
The control of list expansion valve and relevant parameter realizes the stepless of cooling system amount on the basis of the reliable and stable operation of guarantee system
It is adjustable.
Summary of the invention
To solve the above-mentioned problems, the object of the present invention is to provide a kind of compression condensation system of refrigerating capacity step-less adjustment,
The control to list expansion valve and relevant parameter is completed by Measurement and Control System, in the base for guaranteeing the reliable and stable operation of system
The stepless adjustable of cooling system amount is realized on plinth.
The present invention provides the following technical solutions：
A kind of compression condensation system of refrigerating capacity step-less adjustment, the compression condensation system include compression condensation part, system
Adaptive part, transfiguration adjust part and measurement control section；
The compression condensation part includes compressor, condenser, oil and gas-liquid separator, and the compressor and gas-liquid are divided
It is connected by pipeline from device, oil, the condenser is connected with oil by pipeline；
The system self-adaption part includes the cooling valve module of air-breathing and hot-gas bypass valve module, the cooling valve group of the air-breathing
Part adjusts part with condenser, transfiguration and is connected by pipeline, and the hot-gas bypass valve module and oil, transfiguration adjusting part are equal
It is connected by pipeline, the cooling valve module of the air-breathing, hot-gas bypass valve module pass through pipeline and be connected with gas-liquid separator；
The measurement control section adjusts part with system self-adaption part, transfiguration and is connected by circuit.
Preferably, the air-breathing cools down the solenoid valve that valve module includes the cooling valve of air-breathing and is connected with the cooling valve of the air-breathing
One, the hot-gas bypass valve module includes hot gas bypass valve and the solenoid valve being connected with the hot gas bypass valve two；The electromagnetism
Valve one adjusts part with condenser, transfiguration and is connected by pipeline, and the solenoid valve two adjusts part with oil, transfiguration and passes through
Pipeline is connected, and the cooling valve of the air-breathing, hot gas bypass valve pass through pipeline and be connected with gas-liquid separator.
Preferably, the transfiguration adjustment portion point includes electronic expansion valve module, hot gas defrosting valve module, liquid distributing device and steaming
Device is sent out, the electronic expansion valve module is connected by pipeline with solenoid valve one, condenser, the hot gas defrosting valve module and electricity
Magnet valve two, oil are connected by pipeline, and the electronic expansion valve module, hot gas defrosting valve module pass through pipeline and liquid separation fills
Set connected, the liquid distributing device is also connected with evaporator.
Preferably, the electronic expansion valve module includes electric expansion valve and the solenoid valve that is connected with the electric expansion valve
Three, the hot gas defrosting valve module includes hot gas defrosting valve and the solenoid valve four that is connected with the hot gas defrosting valve, the electromagnetism
Valve three is connected by pipeline with solenoid valve one, condenser, and the solenoid valve four passes through pipeline phase with solenoid valve two, oil
Even, the electric expansion valve, hot gas defrosting valve pass through pipeline and are connected with liquid distributing device.
Preferably, measurement control section includes PLC-CPU unit, PLC Analog input mModule, PLC analog output mould
Block, PLC switching value output module, cold and hot adjusting table, temperature sensor and pressure sensor, the PLC-CPU unit and PLC mould
Analog quantity input module, PLC analog output module, PLC switching value output module are electrically connected, the PLC output switch parameter mould
Block is electrically connected with solenoid valve one, solenoid valve two, solenoid valve three, solenoid valve four, and the PLC Analog input mModule and temperature pass
Sensor, pressure sensor, cold and hot adjusting table are electrically connected, and the PLC analog output module is electrically connected with electric expansion valve, institute
State temperature sensor, pressure sensor is arranged on evaporator outlet pipe.
The beneficial effects of the invention are as follows：The present invention provides a kind of compression condensation system of refrigerating capacity step-less adjustment, passes through survey
Amount control system completes the control to list expansion valve and relevant parameter, real on the basis of guaranteeing system reliable and stable operation
Now cooling system amount is stepless adjustable.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of compression condensation system；
Cooling capacity output figure among the adaptive variable volume system of principle pressure enthalpy-of Fig. 2A compression condensation system；
Fig. 2 B is the principle pressure enthalpy -100% cooling capacity output figure of adaptive variable volume system of compression condensation system；
Fig. 3 is the electronic expansion valve controls chart of main factor；
Fig. 4 A is electric expansion valve and cold and hot table output signal relational graph when opening a compressor；
Fig. 4 B is that two compressors of unlatching are the compressor electric expansion valve first opened and cold and hot table output signal relationship
Figure；
Fig. 4 C is to open two compressors to be, post-opening compressor electric expansion valve and cold and hot table output signal relationship
Figure.
Attached meaning marked in the figure is as follows：
Three 10- electric expansion valve 12- evaporator 13- gas-liquid of 1- compressor 2- condenser 4- oil 9- solenoid valve point
From cooling one two 18- solenoid valve of 16- hot gas bypass valve 17- solenoid valve of valve 15- solenoid valve, the four 19- hot gas of device 14- air-breathing
Defrosting valve 20- temperature sensor 21- pressure sensor
Specific embodiment
The present invention is illustrated combined with specific embodiments below.
Compression condensation system of the invention is largely divided into four parts：Compression condensation part, system self-adaption part, transfiguration
Adjust part, measurement control section；
Compression condensation part：This part is mainly by compressor 1, condenser 2, oil 4, the composition of gas-liquid separator 13.Into
Compressor be low-temp low-pressure gaseous refrigerant, compressor compresses it into the gaseous refrigerant of high temperature and pressure, is discharged into condensation
Device, condenser use water-cooled, and high temperature and high pressure gaseous refrigerant is fully cooled by condenser, and heat is taken away by cooling water, refrigeration
Agent becomes the liquid refrigerant of high pressure after condenser；
System self-adaption part：This part is mainly by the cooling valve 14 of air-breathing, hot gas bypass valve 16 and its corresponding electromagnetism
Valve 1 and solenoid valve 2 17 form, the working range that compressor has it to run, and will lead to compression in limiting condition operation
Machine fault alarm and the service life for influencing whether compressor, in order to guarantee whole system compressor in capacity requirement variation
The comfort zone of its working range is always worked in, we are equipped with this set system, and the cooling valve of air-breathing mainly adjusts to be gone out by condenser
The flow (this process completes throttling and evaporation) of the high pressure liquid refrigerant come, hot gas bypass valve mainly adjusts compressor air-discharging side
The gaseous refrigerant agent flux (this process completes isenthalpic throttling) of high temperature and pressure out, carries out heat exchange after the two mixing, hands over
It is reassembled into low-temp low-pressure after changing and has the gaseous refrigerant of enough overheats.This system can guarantee to need in evaporator capacity
Asking is to guarantee that compressor has suitable pressure of inspiration(Pi) and enough degrees of superheat in the case that zero i.e. electric expansion valve completely closes, this
Sample whole system can be detached from evaporator independent operating, this is just that the step-less adjustment of evaporator capacity provides the foundation.System is former
It is as shown in Figure 2 to manage pressure-enthalpy chart.
Transfiguration adjusts part：It is mainly steamed by electric expansion valve 10 and its corresponding solenoid valve 39, liquid distributing device 11 part
It sends out device 12 and hot gas defrosting valve 19 and its corresponding solenoid valve 4 18 forms, this part is mainly that system offer infinitely variable is cold
Source, before having based on several parts after, as long as at this moment adjust electric expansion valve aperture, so that it may control according to demand
System flows through the flow of the refrigerant of evaporator, to realize the step-less adjustment to cooling capacity.When evaporating pressure is too low under Part load
When, to prevent evaporimeter frosting, hot gas defrosting valve 19 can be opened and complete defrosting.
Measure control section：This part is mainly by PLC-CPU unit, PLC Analog input mModule, PLC output switch parameter
Module, PLC analog output module, cold and hot adjusting table and temperature sensor 20, pressure sensor 21, solenoid valve 39 and electromagnetism
Valve 4 18 respectively corresponds electric expansion valve 10 and hot gas defrosting valve 19, the opens solenoid valve three when electric expansion valve 10 needs work
9, the opens solenoid valve 4 18 when hot gas defrosting valve 19 needs work；Temperature sensor and pressure sensor are mainly used to acquisition and steam
The refrigerant pressure and refrigerant temperature on device outlet main pipe are sent out, internal digital signal is converted by PLC, to calculate indirectly
The degree of superheat of evaporator outlet refrigerant at this time out；Cold and hot adjusting table is mainly used for exporting the refrigeration capacity requirement percentage of evaporation coil
Than, which is also acquired by PLC, by internal COMPREHENSIVE CALCULATING, final decision electric expansion valve real output value,
For the systematic schematic diagram as shown in Figure 1, within the system, the high pressure gas of compressor discharge splits into two parts, and one
Part liquid phase throttling and evaporation after condenser condenses is freezed, and another part is same to liquid phase through modulating gas valve phase isenthalpic throttling through hot gas
One pressure then mixes two fluids to compressor air suction state.The coupling of crucial valve member both can guarantee that compressor was transported
Row can complete the accurate step-less adjustment of cooling capacity in comfort conditions in conjunction with the control to electric expansion valve.
Compression condensation system of the invention mainly includes the cooling valve of air-breathing, hot gas bypass valve, electric expansion valve and vapor pres- sure
The valve member of the auxiliary such as force regulating valve and oil return solenoid valve, wherein the cooling valve of air-breathing and hot gas bypass valve are to cooperate and adjust
Guarantee the basic pressure of inspiration(Pi) and suction superheat of compressor, guarantees the operation of compressor under full load mode, electric expansion valve
With control system for guaranteeing that system output cooling capacity is continuously adjustable, whole system can be used to refrigeration air-conditioner production after mixing evaporator
Product performance test apparatus, for realizing the accurate control to environment temperature.
Control strategy
Hot gas bypass valve and the cooling valve of air-breathing：In order to guarantee system energy stable operation, compressor first is opened after start command
It is dynamic, while hot gas bypass valve and the cooling solenoid valve of air-breathing are opened, two valve collective effects guarantee that system refrigeration requirement signal is zero
When, entire compression condensation system itself can complete circulation, guarantee that whole system is run under lowest power consumption, to refrigeration requirement signal
Electronic expansion valve opening increases when increase, and evaporator puts into operation.If compressor start fails, the two valves are also accordingly closed
It closes.
Liquid pipe solenoid valve：It is in close state in compressor runs initial a period of time (15S), is stored in evaporator
Interior refrigerant first engages in circulation, in case the refrigerant stored in evaporator excessively causes liquid hammer to protect compressor.
Hot gas defrosting solenoid valve：Hot gas defrosting solenoid valve is matched with hot gas defrosting valve, to prevent evaporation coil frosting,
When compressor is in operating status and refrigeration requirement is less than 10%, hot gas defrosting solenoid valve is opened, when refrigeration requirement is restored to
Hot gas defrosting solenoid valve is closed when 40% or more, and there is 30% return difference in centre；
Electric expansion valve：The output of electronic expansion valve opening decision systems cooling capacity, the precision that system controls environment temperature
It is dependent on the control of electric expansion valve, the control of electric expansion valve is a control point of most critical in whole system, is used
SER the and SEI series expansion valve of SPORLAN, expansion valve controller use the IB Series Controller of SPORLAN, the control point of valve
Resolution is 1/1600, better than the requirement for adjusting table output accuracy 1/1000.It is as shown in Figure 3 to the control principal element of the valve.
In order to realize the accurate control to electric expansion valve, present invention introduces OMRON CJ2 series of PLC, use CJ1W-
PTS51 temperature input unit completes the acquisition conversion of compressor air suction temperature, uses CJ1W-AD081-V1 analog input list
Member is completed the acquisition to suction pressure of compressor and is converted, and swollen to electronics by the realization of CJ1W-DA08C analog output unit
The aperture of swollen valve controls, and the specific implementation of above each node is described below：
Acquire pressure of inspiration(Pi)：By arranging pressure sensor in compressor air suction mouth, 4~20mA of direct current signal is exported, is somebody's turn to do
Signal enters PLC analogue collection module, is converted into pressure signal；
Acquire suction temperature：By arranging that thermocouple, thermocouple are directly connected to PLC thermoelectricity on compressor suction duct road
Even module is converted into temperature signal from inside modules；It is specific as shown in table 1,
Table 1
The calculating of suction superheat：After calculating compressor air suction temperature and pressure of inspiration(Pi) according to two above step,
Working medium physical property table is stored in PLC memory, physical property table is chosen the data between -50 DEG C~50 DEG C according to actual needs, is stored in
In the area DM of PLC, because the region PLC is powered off the region of storage, all pressure and the data for corresponding to saturation temperature are stored in
The region will not lose because of system cut-off.It, cannot be all of refrigerant working medium physical property table because of the limitation of memory capacity
Data are stored in PLC, and this programme takes the method for storing one group of data at interval of 10kPa, take into account accuracy and practicability,
The practical interpolation calculation of program goes out the corresponding saturation temperature of each actual pressure, further according to the difference meter of actual temperature and saturation temperature
Calculate the degree of superheat.
Cold and hot table output：Using the cold and hot table of Yokogawa UT series, cold and hot table cold side signal is introduced into PLC, swollen as electronics
The swollen most important adjustment signal source of valve, since system can be made of a compressor either two compressors, to one
For the system of compressor, it is swollen that the adjustment signal of cold and hot table output is directly output to electronics after can directly integrating with other conditions
Swollen valve；For the system that two compressors are constituted, when only opening one, cold and hot table output 0~100% directly adjusts this pressure
The corresponding expansion valve of contracting machine；First to judge which platform is first opened when opening two, first open using cold and hot 0~50% signal section of table
Point (i.e. DC4~12mA), after open using cold and hot 50~100% part of table (i.e. DC12~20mA), 0~50%, cold and hot table
Divide actual signal to correspond to the 0~100% of single compressor electronic expansion valve opening, is opened after cold and hot 50~100% part of table-correspondence
That compressor electronic expansion aperture 0~100%, the following curve of various situations is indicated, as shown in figure 4, X-axis generation
The cold and hot table output signal of table (0~100% corresponding DV4~20mA), Y-axis represents the letter of output electron expansion valve after PLC conversion
Number (0~100% corresponding DV4~20mA).
Electronic expansion valve controls：In addition to hot gas bypass solenoid valve, the cooling solenoid valve of air-breathing, liquid pipe solenoid valve, hot gas defrosting
Outside the control of several auxiliary valves such as solenoid valve, the cooling capacity of whole system output is finally controlled by the aperture of electric expansion valve, above
The step of several keys respectively independently generates an output, system finally in summary each output：A. suction superheat PID
The calculated output valve of algorithm；B. the minimum calculated output valve of pressure of inspiration(Pi) pid algorithm；C. cold and hot table and PLC collective effect
The output valve of generation；D. the maximum opening value set when system debug, final PLC take its minimum value swollen as electronics when calculating
The output valve of swollen valve, in this way, by being precisely controlled to main electric expansion valve and a series of auxiliary valve, to realize whole system
Stable operation, and complete the step-less adjustment of semen donors.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, although referring to aforementioned reality
Applying example, invention is explained in detail, for those skilled in the art, still can be to aforementioned each implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features.It is all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of compression condensation system of refrigerating capacity step-less adjustment, which is characterized in that the compression condensation system includes compression condensation
Partially, system self-adaption part, transfiguration adjust part and measurement control section；
The compression condensation part includes compressor (1), condenser (2), oil (4) and gas-liquid separator (13), the compression
Machine (1) is connected by pipeline with gas-liquid separator (13), oil (4), and the condenser (2) passes through pipeline phase with oil (4)
Even；
The system self-adaption part includes the cooling valve module of air-breathing and hot-gas bypass valve module, the cooling valve module of the air-breathing with
Condenser (2), transfiguration adjust part and are connected by pipeline, and the hot-gas bypass valve module and oil (4), transfiguration adjust part
It is connected by pipeline, the cooling valve module of the air-breathing, hot-gas bypass valve module pass through pipeline and gas-liquid separator (13) phase
Even；
The measurement control section adjusts part with system self-adaption part, transfiguration and is connected by circuit.
2. a kind of compression condensation system of refrigerating capacity step-less adjustment according to claim 1, which is characterized in that the air-breathing
Cooling valve module includes air-breathing cooling valve (14) and the solenoid valve one (15) of (14) that is connected with the cooling valve of the air-breathing, the hot gas
Bypass valve assembly includes hot gas bypass valve (16) and the solenoid valve two (17) that is connected with the hot gas bypass valve (16)；The electromagnetism
Valve one (15) adjusts part with condenser (2), transfiguration and is connected by pipeline, the solenoid valve two (17) and oil (4), transfiguration
It adjusts part to be connected by pipeline, the air-breathing cooling valve (14), hot gas bypass valve (16) pass through pipeline and gas-liquid separation
Device (13) is connected.
3. a kind of compression condensation system of refrigerating capacity step-less adjustment according to claim 2, which is characterized in that the transfiguration
Adjustment portion point is swollen including electronic expansion valve module, hot gas defrosting valve module, liquid distributing device (11) and evaporator (12), the electronics
Swollen valve module is connected by pipeline with solenoid valve one (15), condenser (2), the hot gas defrosting valve module and solenoid valve two
(16), oil (4) is connected by pipeline, and the electronic expansion valve module, hot gas defrosting valve module pass through pipeline and liquid separation
Device (11) is connected, and the liquid distributing device (11) is also connected with evaporator (12).
4. a kind of compression condensation system of refrigerating capacity step-less adjustment according to claim 3, which is characterized in that the electronics
Expansion valve component includes electric expansion valve (10) and the solenoid valve three (9) that is connected with the electric expansion valve (10), the hot gas
Defrosting valve module includes hot gas defrosting valve (19) and the solenoid valve four (18) that is connected with the hot gas defrosting valve (19), the electromagnetism
Valve three (9) is connected by pipeline with solenoid valve one (15), condenser (2), the solenoid valve four (18) and solenoid valve two (17),
Oil (4) is connected by pipeline, and the electric expansion valve (10), hot gas defrosting valve (19) pass through pipeline and liquid distributing device
(11) it is connected.
5. a kind of compression condensation system of refrigerating capacity step-less adjustment according to claim 4, which is characterized in that measurement control
Part includes PLC-CPU unit, PLC Analog input mModule, PLC analog output module, PLC switching value output module, cold
Thermal conditioning table, temperature sensor (20) and pressure sensor (21), the PLC-CPU unit and PLC Analog input mModule,
PLC analog output module, PLC switching value output module are electrically connected, the PLC switching value output module and solenoid valve one
(15), solenoid valve two (17), solenoid valve three (9), solenoid valve four (18) are electrically connected, the PLC Analog input mModule and temperature
Degree sensor (20), pressure sensor (21), cold and hot adjusting table are electrically connected, and the PLC analog output module and electronics are swollen
Swollen valve (10) electrical connection, the temperature sensor (20), pressure sensor (21) are arranged on evaporator (12) outlet.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113757980A (en) * | 2020-06-01 | 2021-12-07 | 广东美的暖通设备有限公司 | Air conditioning system, control method of air conditioning system, and computer-readable storage medium |
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| CN204923613U (en) * | 2015-08-06 | 2015-12-30 | 重庆泰思特试验仪器有限公司 | Accurate control system of refrigerating output |
| CN204923602U (en) * | 2015-08-25 | 2015-12-30 | 北京振兴华龙制冷设备有限责任公司 | Refrigerating output infinitely variable control's refrigerating plant |
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| CN113757980A (en) * | 2020-06-01 | 2021-12-07 | 广东美的暖通设备有限公司 | Air conditioning system, control method of air conditioning system, and computer-readable storage medium |
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