CN109425141A - A kind of carbon dioxide air-conditioning and pressure control and guard method - Google Patents
A kind of carbon dioxide air-conditioning and pressure control and guard method Download PDFInfo
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- CN109425141A CN109425141A CN201811483413.4A CN201811483413A CN109425141A CN 109425141 A CN109425141 A CN 109425141A CN 201811483413 A CN201811483413 A CN 201811483413A CN 109425141 A CN109425141 A CN 109425141A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 46
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 40
- 238000004378 air conditioning Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000003507 refrigerant Substances 0.000 claims description 25
- 238000011084 recovery Methods 0.000 claims description 15
- 238000005057 refrigeration Methods 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 8
- 239000002826 coolant Substances 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 238000004880 explosion Methods 0.000 abstract description 6
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 230000010355 oscillation Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- KYKAJFCTULSVSH-UHFFFAOYSA-N chloro(fluoro)methane Chemical compound F[C]Cl KYKAJFCTULSVSH-UHFFFAOYSA-N 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
Classifications
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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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/008—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant being carbon dioxide
-
- 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
- F25B49/005—Arrangement or mounting of control or safety devices of safety devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a kind of carbon dioxide air-conditioning and pressure controls and guard method; by the way that three-level pressure limit is arranged; and different equipment is respectively adopted and is protected; the first order; real-time monitoring is carried out to system high and low pressure lateral pressure by using pressure sensor device; and real-time monitoring is carried out to high side temperature using temperature sensing device, restriction expansion device aperture is adjusted, guarantees high and low pressure lateral pressure and temperature in the normal range；The second level, by installing pressure switch in high and low pressure side, when pipeline inner pressure value beyond normal range (NR) and triggers pressure switch movement, close compressor stops air-conditioning system work；The third level after pipeline inner pressure value exceeds second level range, triggering relief valve is opened, carbon dioxide is discharged in time by installing relief valve in high and low pressure side.The control and protection under pressure oscillation or abnormal conditions to system pressure can be achieved in the present invention, and the risk of system explosion is effectively prevent to occur.
Description
Technical field
The present invention relates to rail vehicle refrigerating field, more particularly, to a kind of carbon dioxide air-conditioning and pressure control and
Guard method.
Background technique
Continuous improvement with international community to environmental requirement is reduced to depletion of the ozone layer and greenhouse effects, idle call system
Cryogen is changed to HCFC hydrogen fluorohydrocarbon class refrigerant by CFC chloro-fluoro-carbon kind, but existing frequently-used HCFC hydrogen fluorohydrocarbon class refrigerant is such as
R134A, greenhouse effects index GWP value is still higher, is 1300.Pass through and signed in Rwanda Kigali in 2016 and " covers
Paul Tellier agreement-Kigali's amendment ", wherein most developed country will cut down HFC class refrigerant since 2019；It is big absolutely
Country will freeze HFC class refrigerant production and consumption in 2024 in partial development.Therefore, world community is sought for
Alternative refrigerant.
Carbon dioxide is as natural refrigerant with greenhouse effects index is low, unit volume refrigerating capacity is big, nontoxic non-combustible, viscous
Spend it is low, be easy to get the features such as low cost, be determined as the first choice of novel refrigerant by vehicle enterprise and Air-conditioning Enterprise.
Compression using the air-conditioning system refrigeration cycle of carbon dioxide coolant is relatively high, and high-pressure side is generally placed at super face
Battery limit (BL) domain, pressure value are generally 4~5 times of current refrigerant, requirement and security of system to system unit in 9~11MPa
It is more demanding.There is larger pressure oscillation during using such as system, there will be the risk of explosion.The countermeasure now used is to increase
The pressure-resistant performance of system unit increases the wall thickness of pipeline, but the risk of system explosion cannot be effectively reduced.
Summary of the invention
It is an object of the invention to overcome drawbacks described above of the existing technology, a kind of pressure of carbon dioxide air-conditioning is provided
Control and guard method are limited by setting multistage pressure, and different equipment are respectively adopted and is protected, and can be effectively prevent
The generation of explosion risk.
To achieve the above object, technical scheme is as follows:
A kind of carbon dioxide air-conditioning, including by compressor, gas cooler, restriction expansion device, evaporator, gas-liquid separation
Refrigeration cycle that device is constituted and that composition is sequentially connected by coolant piping, refrigeration cycle further includes intermediate heat exchange
The high-temperature medium entrance of device, intermediate heat exchanger is connected with the media outlet of gas cooler, and the high temperature of intermediate heat exchanger is situated between
Matter outlet is connected with the medium inlet of restriction expansion device, and the cryogenic media entrance of intermediate heat exchanger and the medium of evaporator go out
Mouth is connected, and the cryogenic media outlet of intermediate heat exchanger is connected with the medium inlet of compressor；It is characterized in that,
It further include the on high-tension side pressure switch one and relief valve one, peace for being mounted on compressor outlet on refrigeration cycle
Mounted in gas cooler outlet on high-tension side pressure sensor device one and temperature sensor, be mounted on compressor inlet and gas-liquid
Pressure sensor device two, pressure switch two and the relief valve two of low-pressure side between separator.
Preferably, the pressure sensor device is pressure transmitter.
Preferably, the restriction expansion device is electric expansion valve.
Preferably, the compressor is Trans-critical cycle refrigeration compressor.
Preferably, the restriction expansion device, the pressure switch one, the pressure sensor device one, the temperature pass
Sensor, the pressure sensor device two, the pressure switch two and the compressor are electrically connected with the controller, and the controller connects
Electric signal of the receipts from the pressure sensor device one, the temperature sensor and the pressure sensor device two, and according to
The value of received electric signal is to the restriction expansion device, the pressure switch one, the relief valve one, the pressure switch two
Action command is issued with the relief valve two.
Preferably, when the pressure value that pressure sensor device one measures exceeds high-pressure side normally-pressured neighbor, or work as pressure
When the pressure value that sensing device two measures exceeds low-pressure side normally-pressured neighbor, or when the temperature that temperature sensor measures exceeds height
When pressing side normal temperature range, controller makes the pressure and high pressure of high and low pressure side by adjusting the aperture of restriction expansion device
The temperature of side is maintained within normal range；
When maximum value of the pressure value that pressure sensor device one measures greater than high-pressure side normally-pressured neighbor, and reach high pressure
When the movement duty pressure of lateral pressure switch one, pressure switch one sends fault-signal to controller, and controller receives fault-signal
Close compressor afterwards；Or the pressure value measured when pressure sensor device two is lower than the minimum value of low-pressure side normally-pressured neighbor,
And when reaching the movement duty pressure of low-pressure lateral pressure switch two, pressure switch two sends fault-signal to controller, and controller is received
Close compressor after to fault-signal；
When the pressure value that pressure sensor device one measures is restored to the recovery duty pressure of high side pressure switch one, pressure
Switch one, which is sent, restores signal to controller, and controller receives reset itself after recovery signal；Or work as pressure sensor device
When two pressure values measured are restored to the recovery duty pressure of low-pressure lateral pressure switch two, pressure switch two, which is sent, restores signal to control
Device processed, controller receive reset itself after recovery signal；
When movement duty pressure of the pressure value that pressure sensor device one measures more than high side pressure switch one, and reach
When the unlatching duty pressure of high-pressure side relief valve one, high-pressure side relief valve one is automatically turned on, and carbon dioxide is discharged；Or when pressure passes
The pressure value that induction device one measures is higher than the maximum value of low-pressure side normally-pressured neighbor, and reaches opening for low-pressure side relief valve two
When opening duty pressure, low-pressure side relief valve two is automatically turned on, and carbon dioxide is discharged.
Preferably, the controller be air-conditioning central controller or the controller include air-conditioning central controller and
Restriction expansion device controller.
Preferably, it is logical that data are able to carry out between the air-conditioning central controller and the restriction expansion device controller
News.
A kind of control of carbon dioxide air conditioning pressure and guard method, which is characterized in that including three class control,
The first order: when on high-tension side pressure exceeds high-pressure side normally-pressured neighbor or the pressure of low-pressure side exceeds low pressure
When the normally-pressured neighbor of side or when high side temperature exceeds high-pressure side normal temperature range, the aperture of restriction expansion device is adjusted；
The second level: when maximum value of the on high-tension side pressure greater than high-pressure side normally-pressured neighbor, and reach high-pressure side first
When pressure warning value, or when the pressure of low-pressure side is lower than the minimum value of low-pressure side normally-pressured neighbor, and reach low-pressure side the
When one pressure warning value, close compressor；
The third level: when on high-tension side pressure is greater than high-pressure side first pressure warning value, and reach high-pressure side second pressure
When warning value, the carbon dioxide refrigerant in the coolant piping of high-pressure side is discharged, pressure release is carried out to pipeline；Or the pressure when low-pressure side
Higher than the maximum value of low-pressure side normally-pressured neighbor, and when reaching low-pressure side second pressure warning value, low-pressure side refrigerant is discharged
Carbon dioxide refrigerant in piping carries out pressure release to pipeline.
It can be seen from the above technical proposal that the present invention passes through setting three-level pressure limit, and different set is respectively adopted
It is standby to be protected, the first order, by using pressure sensor and temperature sensor, to system high side pressure and low-pressure lateral pressure
Real-time monitoring is carried out with high side temperature, adjusts restriction expansion device aperture, adjusts system pressure in time, guarantees high side pressure
In the normal range with low-pressure lateral pressure；Work as pipeline inner pressure by installing pressure switch in high-pressure side and low-pressure side in the second level
Value is beyond normal range (NR) and triggers pressure switch movement, and air-conditioning central controller can close pressure after receiving pressure switch action signal
Contracting machine stops air-conditioning system work；The third level, by installing relief valve in high-pressure side and low-pressure side, when pipeline inner pressure value is super
Out after the range of the second level, triggering relief valve is opened, carbon dioxide is discharged in time in system.Pressure oscillation can be achieved in the present invention
Or it effectively prevent the risk of system explosion to occur the control of system pressure and protection under abnormal conditions.
Detailed description of the invention
Fig. 1 is the composition schematic diagram of the carbon dioxide air-conditioning of the first specific embodiment of the invention；
Fig. 2 is the composition schematic diagram of the carbon dioxide air-conditioning of the second specific embodiment of the invention；
Fig. 3 is the composition schematic diagram of the carbon dioxide air-conditioning of third specific embodiment of the invention；
Fig. 4 is the schematic diagram of carbon dioxide air conditioning pressure control and guard method of the invention；
In figure: 1, compressor, 2, gas cooler, 3, intermediate heat exchanger, 4, electric expansion valve, 5, evaporator, 6, gas
Liquid/gas separator, 7, high pressure lateral line, 8, low pressure lateral line, 9, controller, 10, high side pressure transmitter one, 11, low pressure side pressure
Power transmitter two, 12, restriction expansion device controller, 13, high-pressure switch one, 14, low pressure switch two, 15, high pressure
Side relief valve one, 16, low-pressure side relief valve two, 17, high side temperature sensor.
Specific embodiment
With reference to the accompanying drawing, specific embodiments of the present invention will be described in further detail.
It should be noted that in following specific embodiments, when describing embodiments of the invention in detail, in order to clear
Ground indicates structure of the invention in order to illustrate, spy does not draw to the structure in attached drawing according to general proportion, and has carried out part
Amplification, deformation and simplified processing, therefore, should be avoided in this, as limitation of the invention to understand.
Embodiment one
Air-conditioning system of the invention is with the CO of Trans-critical cycle2For refrigerant, CO2The critical point temperature of refrigerant is about 31 DEG C, with environment
Temperature is very close, and therefore, rejection temperature must be over critical point temperature, i.e. CO2The heat release of refrigeration cycle is in supercritical region
It carries out, and evaporation endothermic carries out among close-to-critical range, to form Trans-critical cycle refrigeration cycle.
In specific embodiment of the invention below, Fig. 1 and Fig. 4 are please referred to.As shown in Figure 1, titanium dioxide of the invention
Carbon air-conditioning is made of compressor, gas cooler, restriction expansion device and evaporator, gas-liquid separator and passes through refrigerant
Piping is sequentially connected the refrigeration cycle of composition, and refrigeration cycle further includes intermediate heat exchanger, intermediate heat exchanger
High-temperature medium entrance is connected with the media outlet of gas cooler, and high-temperature medium outlet and the throttling expansion of intermediate heat exchanger fill
The medium inlet set is connected, and the cryogenic media entrance of intermediate heat exchanger is connected with the media outlet of evaporator, intermediate heat exchange
The cryogenic media outlet of device is connected with the medium inlet of compressor；In this way, the CO2 refrigerant at the media outlet end of evaporator is another
Secondary heating, and the CO2 refrigerant for entering restriction expansion device is cooled down again, reduces gas cooler media outlet and evaporator
Pressure difference between medium inlet so that restriction loss be greatly lowered, and then improves the efficiency of system.
Restriction expansion device is preferably controllable and adjusts the electric expansion valve of aperture, and the aperture of electric expansion valve can basis
Pressure and/or temperature are adjusted.
Since the critical point of refrigerant CO2 is lower, critical-point pressure is also quite high, so, compressor preferentially uses CO2 refrigerant
Dedicated Trans-critical cycle refrigeration compressor.For energy-saving and emission-reduction, Trans-critical cycle refrigeration compressor is preferably frequency conversion Trans-critical cycle refrigerant compression
Machine.
With reference to Fig. 4, the control of carbon dioxide air conditioning pressure and guard method are divided into three-level protective:
The first order: when on high-tension side pressure exceeds high-pressure side normally-pressured neighbor or the pressure of low-pressure side exceeds low pressure
When the normally-pressured neighbor of side or when high side temperature exceeds high-pressure side normal temperature range, the aperture of restriction expansion device is adjusted,
And then system pressure is adjusted, maintain the pressure value of high and low pressure side to stablize in the normal range.The main realization pair of first order protection
System pressure is detected, controlled and is adjusted, and maintains its pressure in normal range of operation.
The second level: when maximum value of the on high-tension side pressure greater than high-pressure side normally-pressured neighbor, and reach high-pressure side first
When pressure warning value, or when the pressure of low-pressure side is lower than the minimum value of low-pressure side normally-pressured neighbor, and reach low-pressure side the
When one pressure warning value, close compressor.It, can be again when high side pressure, low-pressure lateral pressure are all restored in normal range (NR)
Start compressor.The second level, which is protected, can be achieved pressure limit protection, timely close compressor, halt system work, to system
After pressure recovery to normal range (NR), pressure switch can automatically reset, and air-conditioning system can restart.
The third level: when on high-tension side pressure is greater than high-pressure side first pressure warning value, and reach high-pressure side second pressure
When warning value, the carbon dioxide refrigerant in the coolant piping of high-pressure side is discharged, pressure release is carried out to pipeline；Or the pressure when low-pressure side
Higher than the maximum value of low-pressure side normally-pressured neighbor, and when reaching low-pressure side second pressure warning value, low-pressure side refrigerant is discharged
Carbon dioxide refrigerant in piping carries out pressure release to pipeline.It breaks down such as second level protection and fails or fail to close pressure in time
Contracting machine halt system, the third level can be realized to system decompression, and carbon dioxide in system is discharged rapidly, avoid generating equipment damage
Or more serious consequence, guarantee traffic safety.
By above-mentioned pressure control and protection system, it can be achieved that system under air-conditioning system pressure oscillation or abnormal conditions
The control and protection of pressure.
In the present embodiment, realize that the pressure of carbon dioxide air-conditioning is controlled and protected by following pressures control and protective device
Shield, specifically: further include on refrigeration cycle be mounted on compressor outlet on high-tension side pressure switch one and relief valve one,
It is mounted on the on high-tension side pressure sensor device one of gas cooler outlet and temperature sensor, is mounted on compressor inlet and gas
Pressure sensor device two, pressure switch two and the relief valve two of low-pressure side between liquid/gas separator.
It is mounted on the on high-tension side pressure sensor device one and temperature sensor and be mounted on pressure that gas cooler exports
The pressure sensor device two of low-pressure side between the import of contracting machine and gas-liquid separator, for acquiring and monitoring pressure and temperature in real time
Whether value is in normal range (NR), if improper, adjusts the aperture of restriction expansion device, guarantees at pressure and/or temperature
In in normal range (NR)；Then, when the aperture by adjusting restriction expansion device cannot still make pressure and temperature be in normal range (NR)
When interior, it can be led to by pressure switch close compressor if pressure and/or temperature cannot be still restored in normal range (NR)
The carbon dioxide opened in relief valve discharge conduit is crossed, the generation of pipeline explosion danger is avoided.
Preferably, pressure sensor device is pressure transmitter.
Embodiment two
Refering to Fig. 2 and Fig. 4, the present embodiment increases controller, controller and throttling expansion on the basis of example 1
Device, pressure switch one, pressure sensor device one, temperature sensor, pressure sensor device two, pressure switch two and compression are electromechanical
Connection, electric signal of the controller reception from pressure sensor device one, temperature sensor and pressure sensor device two, and according to
The value of received electric signal issues restriction expansion device, pressure switch one, relief valve one, pressure switch two and relief valve two dynamic
It orders, realizes the automatic control, adjustment and protection of pressure.
When the pressure value that pressure sensor device one measures exceeds high-pressure side normally-pressured neighbor, or work as pressure sensor device
When two pressure values measured exceed low-pressure side normally-pressured neighbor, or when the temperature that temperature sensor measures is normal beyond high-pressure side
When temperature range, controller makes the pressure and on high-tension side temperature of high and low pressure side by adjusting the aperture of restriction expansion device
It is maintained within normal range.
The movement duty pressure of pressure switch one and two is set and restores duty pressure, when the pressure that pressure sensor device one measures
When being worth the maximum value for being greater than high-pressure side normally-pressured neighbor, and reaching the movement duty pressure of high side pressure switch one, pressure is opened
It closes one and sends fault-signal to controller, controller receives close compressor after fault-signal；Or work as pressure sensor device two
The pressure value measured is lower than the minimum value of low-pressure side normally-pressured neighbor, and reaches the movement duty pressure of low-pressure lateral pressure switch two
When, pressure switch two sends fault-signal to controller, and controller receives close compressor after fault-signal.
When the pressure value that pressure sensor device one measures is restored to the recovery duty pressure of high side pressure switch one, pressure
Switch one, which is sent, restores signal to controller, and controller receives reset itself after recovery signal；Or work as pressure sensor device
When two pressure values measured are restored to the recovery duty pressure of low-pressure lateral pressure switch two, pressure switch two, which is sent, restores signal to control
Device processed, controller receive reset itself after recovery signal.The duty pressure that restores of pressure switch one is less than the dynamic of pressure switch one
Make duty pressure and is more than or equal to the maximum value of high-pressure side normally-pressured neighbor.The recovery duty pressure of pressure switch two is greater than low-pressure side
The movement duty pressure of pressure switch two and the minimum value for being less than or equal to low-pressure side normally-pressured neighbor.
When movement duty pressure of the pressure value that pressure sensor device one measures more than high side pressure switch one, and reach
When the unlatching duty pressure of high-pressure side relief valve one, high-pressure side relief valve one is automatically turned on, and carbon dioxide is discharged；Or when pressure passes
The pressure value that induction device one measures is higher than the maximum value of low-pressure side normally-pressured neighbor, and reaches opening for low-pressure side relief valve two
When opening duty pressure, low-pressure side relief valve two is automatically turned on, and carbon dioxide is discharged.
In the present embodiment, controller is the general name of a structure with control function, can be filled by a control
Realization, such as air-conditioning central controller are set, multiple control device cooperative achievements, such as comprehensive utilization air-conditioning center can also be passed through
Controller and restriction expansion device controller, are specifically shown in embodiment three.
Embodiment three
With reference to Fig. 3 and Fig. 4.Since electric expansion valve also has control section, the control of electric expansion valve can be carried out
It improves, electric expansion valve and on high-tension side pressure sensor device one and temperature sensor and the pressure sensor device of low-pressure side two
Electrical connection, when detecting that pressure or temperature beyond normal range (NR), adjust the aperture of electric expansion valve in time.
Due to compressor be by air-conditioning central controller controls, pressure switch one and two can be electrically connected to sky
It adjusts on central controller, realizes and the on and off of compressor is controlled.
Also data communication is carried out between restriction expansion device controller and air-conditioning central controller.
Remaining is all identical with two content of embodiment, and this will not be repeated here.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (9)
1. a kind of carbon dioxide air-conditioning, including by compressor, gas cooler, restriction expansion device, evaporator, gas-liquid separator
Refrigeration cycle constitute and that composition is sequentially connected by coolant piping, refrigeration cycle further includes intermediate heat exchange
The high-temperature medium entrance of device, intermediate heat exchanger is connected with the media outlet of gas cooler, and the high temperature of intermediate heat exchanger is situated between
Matter outlet is connected with the medium inlet of restriction expansion device, and the cryogenic media entrance of intermediate heat exchanger and the medium of evaporator go out
Mouth is connected, and the cryogenic media outlet of intermediate heat exchanger is connected with the medium inlet of compressor；It is characterized in that,
It further include being mounted on the on high-tension side pressure switch one of compressor outlet and relief valve one, being mounted on refrigeration cycle
The on high-tension side pressure sensor device one and temperature sensor of gas cooler outlet are mounted on compressor inlet and gas-liquid separation
Pressure sensor device two, pressure switch two and the relief valve two of low-pressure side between device.
2. carbon dioxide air-conditioning according to claim 1, which is characterized in that the pressure sensor device is pressure inverting
Device.
3. carbon dioxide air-conditioning according to claim 1, which is characterized in that the restriction expansion device is electronic expansion
Valve.
4. carbon dioxide air-conditioning according to claim 1, which is characterized in that the compressor is Trans-critical cycle refrigerant compression
Machine.
5. carbon dioxide air-conditioning according to claim 1, which is characterized in that the restriction expansion device, the pressure are opened
Guan Yi, the pressure sensor device one, the temperature sensor, the pressure sensor device two, the pressure switch two and institute
Compressor is stated to be electrically connected with the controller, the controller receive from the pressure sensor device one, the temperature sensor and
The electric signal of the pressure sensor device two, and based on the received the value of electric signal to the restriction expansion device, the pressure
Power switch one, the relief valve one, the pressure switch two and the relief valve two issue action command.
6. carbon dioxide air-conditioning according to claim 5, which is characterized in that
When the pressure value that pressure sensor device one measures exceeds high-pressure side normally-pressured neighbor, or when pressure sensor device two is surveyed
When the pressure value obtained exceeds low-pressure side normally-pressured neighbor, or when the temperature that temperature sensor measures exceeds high-pressure side normal temperature
When range, controller maintains the pressure of high and low pressure side and on high-tension side temperature by adjusting the aperture of restriction expansion device
In the normal range；
When maximum value of the pressure value that pressure sensor device one measures greater than high-pressure side normally-pressured neighbor, and reach high pressure side pressure
When the movement duty pressure of power switch one, pressure switch one sends fault-signal to controller, and controller closes after receiving fault-signal
Close compressor；Or the pressure value measured when pressure sensor device two is lower than the minimum value of low-pressure side normally-pressured neighbor, and reaches
To low-pressure lateral pressure switch two movement duty pressure when, pressure switch two send fault-signal to controller, controller receive therefore
Close compressor after barrier signal；
When the pressure value that pressure sensor device one measures is restored to the recovery duty pressure of high side pressure switch one, pressure switch
One sends recovery signal to controller, and controller receives reset itself after recovery signal；Or when pressure sensor device two is surveyed
When the pressure value obtained is restored to the recovery duty pressure of low-pressure lateral pressure switch two, pressure switch two, which is sent, restores signal to control
Device, controller receive reset itself after recovery signal；
When movement duty pressure of the pressure value that pressure sensor device one measures more than high side pressure switch one, and reach high pressure
When the unlatching duty pressure of side relief valve one, high-pressure side relief valve one is automatically turned on, and carbon dioxide is discharged；Or when pressure sensing fills
It sets the pressure value that one measures and is higher than the maximum value of low-pressure side normally-pressured neighbor, and reach the unlatching value of low-pressure side relief valve two
When pressure, low-pressure side relief valve two is automatically turned on, and carbon dioxide is discharged.
7. carbon dioxide air-conditioning according to claim 5 or 6, which is characterized in that the controller is the control of air-conditioning center
Device or the controller include air-conditioning central controller and restriction expansion device controller.
8. carbon dioxide air-conditioning according to claim 7, which is characterized in that the air-conditioning central controller and the throttling
Data communication is able to carry out between expansion device controller.
9. a kind of control of carbon dioxide air conditioning pressure and guard method, which is characterized in that including three class control,
The first order: when on high-tension side pressure exceeds high-pressure side normally-pressured neighbor or the pressure of low-pressure side is exceeding low-pressure side just
When normal pressure limit or when high side temperature exceeds high-pressure side normal temperature range, the aperture of restriction expansion device is adjusted；
The second level: when maximum value of the on high-tension side pressure greater than high-pressure side normally-pressured neighbor, and reach high-pressure side first pressure
When warning value, or when low-pressure side pressure be lower than low-pressure side normally-pressured neighbor minimum value, and reach low-pressure side first pressure
When power warning value, close compressor；
The third level: when on high-tension side pressure is greater than high-pressure side first pressure warning value, and reach the warning of high-pressure side second pressure
When value, the carbon dioxide refrigerant in the coolant piping of high-pressure side is discharged, pressure release is carried out to pipeline；Or when the pressure of low-pressure side is higher than
The maximum value of low-pressure side normally-pressured neighbor, and when reaching low-pressure side second pressure warning value, discharge low-pressure side coolant piping
In carbon dioxide refrigerant, to pipeline carry out pressure release.
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| CN201811483413.4A CN109425141A (en) | 2018-12-06 | 2018-12-06 | A kind of carbon dioxide air-conditioning and pressure control and guard method |
| PCT/CN2019/093312 WO2020113949A1 (en) | 2018-12-06 | 2019-06-27 | Carbon dioxide air conditioner and pressure control and protection method |
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| WO2020113949A1 (en) * | 2018-12-06 | 2020-06-11 | 中车大连机车研究所有限公司 | Carbon dioxide air conditioner and pressure control and protection method |
| CN111878933A (en) * | 2019-07-22 | 2020-11-03 | 北京联合大学 | Safe and efficient central air conditioner temperature adjusting structure and method |
| CN113580876A (en) * | 2021-07-21 | 2021-11-02 | 吉利汽车研究院（宁波）有限公司 | Carbon dioxide air conditioner protection device and control strategy thereof |
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| WO2020113949A1 (en) | 2020-06-11 |
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