CN107906778B - The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount - Google Patents

The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount Download PDF

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Publication number
CN107906778B
CN107906778B CN201711111639.7A CN201711111639A CN107906778B CN 107906778 B CN107906778 B CN 107906778B CN 201711111639 A CN201711111639 A CN 201711111639A CN 107906778 B CN107906778 B CN 107906778B
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expansion valve
jet
heat exchanger
compressor
electric expansion
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CN107906778A (en
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方杰
杨亚华
杨兵
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Nanjing TICA Climate Solutions Co Ltd
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Nanjing TICA Climate Solutions Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B49/00Arrangement or mounting of control or safety devices
    • F25B49/02Arrangement or mounting of control or safety devices for compression type machines, plant or systems
    • F25B49/022Compressor control arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/031Sensor arrangements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2500/00Problems to be solved
    • F25B2500/28Means for preventing liquid refrigerant entering into the compressor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/01Timing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2600/00Control issues
    • F25B2600/25Control of valves
    • F25B2600/2513Expansion valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21171Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21172Temperatures of an evaporator of the fluid cooled by the evaporator at the inlet
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2700/00Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21Temperatures
    • F25B2700/2117Temperatures of an evaporator
    • F25B2700/21171Temperatures of an evaporator of the fluid cooled by the evaporator
    • F25B2700/21173Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet

Abstract

The present invention relates to a kind of control systems of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, compressor, oil eliminator, four-way valve, outdoor unit heat exchanger, heating electronic expansion valve module, plate heat exchanger, jet electric expansion valve, gas-liquid separator, indoor set heat exchanger and electronic expansion valve of indoor unit including being sequentially connected and constituting circuit;Jet pipeline has check valve inside the compressor;The compressor top is equipped with the first temperature sensor;Second temperature sensor is equipped between the plate heat exchanger evaporation side-entrance and the jet electronic expansion valve outlet;Third temperature sensor is equipped between the plate heat exchanger evaporation side outlet and the compressor jet import;High-pressure pressure sensor is equipped between the oil eliminator and the four-way valve.Its control method are as follows: switch control is carried out to jet electric expansion valve according to the degree of superheat of bearing down on one of compressor, aperture regulation is carried out to jet electric expansion valve according to the degree of superheat of plate heat exchanger, keep jet amount optimal, guarantee unit operation stability, improves unit efficiency.

Description

The control system and control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount
Technical field
The present invention relates to a kind of multi-online air-conditioning system, especially a kind of air injection enthalpy-increasing in multi-online air-conditioning system The control system and control method of the jet amount of compressor, specifically a kind of multi-gang air-conditioner unit air injection enthalpy-increasing jet The control system and control method of amount.
Background technique
With the reduction of environment temperature, heating capacity and corresponding COP are also decreased heat pump air conditioner unit, but are consumed Crowd is to be continuously increased as ambient temperature reduces.So some large-size air conditioning producers become start to be considered as it is higher Technology correspond to these demands, especially business air conditioner is particularly evident." air injection enthalpy-increasing " technology is also just come into being, it is also to belong to It is recycled in air-conditioning two-stage compression, heating capacity can not only be greatly improved, but also COP can be improved, so more and more Air-conditioning producer be familiar with, receive and apply.
But " air injection enthalpy-increasing " technology accurate control of jet amount for being exactly based on pair guarantees that compressor and system play Optimum efficiency.If jet amount is improper or adjustable range is narrow, verifying harm will be generated to system.Jet amount is too small, row Temperature degree is high, and can not only damage compressor influences system operation, while can not play output capacity, loses the effect of " air injection enthalpy-increasing " Fruit.Jet amount is excessive, and compressor has band liquid to operate hidden danger, equally unfavorable to system.Some producers have due to cost or technology Limit takes capillary or solenoid valve to carry out simple matching unlatching and deals with control, although these control modes are simple, It is difficult to reach safe and stable operation in the case of various varying duties.Moreover, the application range of this method is narrow, cannot equally protect The stable operation of card system and the performance of air-conditioning effect.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of the present invention to provide a kind of multi-gang air-conditioner unit air injection enthalpy-increasing jet amounts Control system and control method, the running environment of unit can be effectively improved, and play the performance of unit efficiently.
The technical scheme is that
A kind of control system of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, including being sequentially connected and constituting circuit Compressor, oil eliminator, four-way valve, outdoor unit heat exchanger, heating electronic expansion valve module, plate heat exchanger, jet electronics are swollen Swollen valve, gas-liquid separator, indoor set heat exchanger and electronic expansion valve of indoor unit;
The compressor is air injection enthalpy-increasing compressor, and outlet is connected with the oil eliminator import, the oil separation The outlet of device is connect with the import of the four-way valve, the refrigerant inlet of the C pipe and the outdoor unit heat exchanger of the four-way valve Connection, the refrigerant outlet of the outdoor heat exchanger access the import of the heating electronic expansion valve module, the heating electronics The import that cold side is crossed with the plate heat exchanger in the outlet of expansion valve component is connect, and the plate heat exchanger crosses the outlet of cold side Point two-way, connect with the jet electric expansion valve import all the way, another way by several branch pipes respectively with corresponding interior The electronic expansion valve of indoor unit import of machine is connected, outlet and the plate heat exchanger of the jet electric expansion valve Side-entrance connection is evaporated, the plate heat exchanger evaporation side outlet is connect with compressor jet import;Each indoor unit heat exchange The outlet of device leads to outdoor after merging by respective branch pipe and is connected with the E of four-way valve mouth, the S mouth of the four-way valve It is connected with the import of the gas-liquid separator, the outlet of the gas-liquid separator is connected with the compressor air suction mouth;
The compressor top is equipped with the first temperature sensor;The plate heat exchanger evaporation side-entrance and jet electricity Second temperature sensor is equipped between sub- expansion valve outlet;Plate heat exchanger evaporation side outlet and the compressor jet into Third temperature sensor is equipped between mouthful;High-pressure pressure sensor is equipped between the oil eliminator and the four-way valve;
First temperature sensor, second temperature sensor, third temperature sensor and high-pressure pressure sensor difference It is connected with the input terminal of master control borad, the output end of the master control borad connects the jet electric expansion valve.
Further, the air-conditioner set is multi-gang air-conditioner unit, wherein the inside jet of air injection enthalpy-increasing compressor Pipeline has check valve, and is suitable for the bear down on one degree of superheat and the dual accurate control of the plate heat exchanger degree of superheat.
A kind of control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, comprising the following steps:
Step 1: acquisition the first temperature sensor temperature value and the high-pressure pressure sensor pressure value, by described Master control borad calculates the air injection enthalpy-increasing compressor and bears down on one degree of superheat T-SH1- is practical, and compare calculated value and target value T-SH1- meshIt is big Small, output control signal controls the switch of the jet electric expansion valve;
Step 2: acquiring the temperature value of the second temperature sensor Yu the third temperature sensor, pass through the master control Plate calculates the plate heat exchanger evaporation side degree of superheat T-SH6.The practical plate heat exchanger evaporation side degree of superheat is run according to unit T- SH6- is practicalWith the target value T- of settingSH6- meshDifference the aperture of electric expansion valve is adjusted;
Step 3: after compressor actual motion reaches the first predetermined time t1, if the degree of superheat T- that bears down on one of compressorSH1- is practical ≥T-SH1- mesh +△T 1DEG C when, the jet electric expansion valve is opened into initial opening P0
Step 4: the jet electric expansion valve is opened into initial opening P0Adjusting afterwards is controlled in the following way, Each regulating cycle is the second predetermined time t2.T-SH6- is practical> T-SH6- mesh+△T2When, jet electric expansion valve movement step number is opened Degree=(T-SH6- is practical- T-SH6- mesh) × adjustment factor 1;T-SH6- mesh- △ T2≤T-SH6- is practical≤T-SH6- mesh+△T2When, the jet Electric expansion valve is failure to actuate, and keeps former aperture constant;T-SH6- is practical< T-SH6- mesh- △ T2When, jet electric expansion valve action step Number aperture=(T-SH6- is practical- T-SH6- mesh) × adjustment factor 2;
Step 5: in unit operation, if T-SH1- is practical< T-SH1- is pre-- △ T 1When, reach third predetermined time t3, it is described Jet electric expansion valve is closed.
Further, the degree of superheat target value T- that bears down on one in the step 1SH1- meshIt is 15~20 DEG C.
Further, the plate heat exchanger evaporation side degree of superheat T- in the step 2SH6- meshIt is 3~5 DEG C.
Further, first predetermined time t1 in the step 3 is 10min, the △ T1=3℃。
Further, second predetermined time t2 in the step 4 is 80s, the △ T2=2℃;The spray simultaneously 1≤adjustment factor of adjustment factor 2 of gas electric expansion valve.
Beneficial effects of the present invention:
The present invention carries out the switch control of corresponding compressor jet electric expansion valve, root according to the degree of superheat of bearing down on one of compressor The aperture regulation control that corresponding compressor jet electric expansion valve is carried out according to the degree of superheat of plate heat exchanger, has been effectively ensured compression Machine will not be overheated or be run with liquid, optimize control to existing air injection enthalpy-increasing system jet amount, it is ensured that jet amount reaches most It is good, it not only can guarantee unit operation stability, but also unit efficiency can be improved.
Detailed description of the invention
Fig. 1 is control system figure of the invention.
Fig. 2 is control method flow chart of the invention.
Wherein: 1- compressor;2- oil eliminator;3- four-way valve;4- outdoor unit heat exchanger;5- heats electronic expansion valve group Part;6- plate heat exchanger;7- jet electric expansion valve;8- gas-liquid separator;The first temperature sensor of 9-;10- second temperature passes Sensor;11- third temperature sensor;13- electronic expansion valve of indoor unit;14- indoor set heat exchanger;15- high-pressure pressure sensor; EXV- electric expansion valve.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As shown in Figure 1, a kind of control system of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, including be sequentially connected and Constitute air injection enthalpy-increasing compressor 1, oil eliminator 2, four-way valve 3, outdoor unit heat exchanger 4, the heating electronic expansion valve module in circuit 5, plate heat exchanger 6, jet electric expansion valve 7, gas-liquid separator 8, indoor set heat exchanger 14 and electronic expansion valve of indoor unit 13.
The compressor 1 is air injection enthalpy-increasing compressor, and outlet is connected with 2 import of oil eliminator.The oil Outlet from device 2 is connect with the import of the four-way valve 3, the refrigeration of the C pipe and the outdoor unit heat exchanger 4 of the four-way valve 3 Agent import connection, the refrigerant outlet of the outdoor heat exchanger 4 accesses the import of the heating electronic expansion valve module 5, described The outlet of heating electronic expansion valve module 5 is connect with the import that the plate heat exchanger 6 crosses cold side, the plate heat exchanger 6 The outlet for crossing cold side divides two-way: connecting all the way with 7 import of jet electric expansion valve, another way passes through several branch pipes point It is not connected with 13 import of the electronic expansion valve of indoor unit of corresponding indoor unit.The outlet of the jet electric expansion valve 7 with The plate heat exchanger 6 evaporates side-entrance connection, and the plate heat exchanger 6 evaporates side outlet and the 1 jet import of compressor Connection;The outdoor E with the four-way valve 3 is led in the outlet of each indoor set heat exchanger 14 after merging by respective branch pipe Mouth is connected, and the S mouth of the four-way valve 3 is connected with the import of the gas-liquid separator 8, the outlet of the gas-liquid separator 8 It is connected with 1 air entry of compressor.
The first temperature sensor 9 is equipped at the top of the compressor 1;The plate heat exchanger 6 evaporates side-entrance and the spray Gas electric expansion valve 7 is equipped with second temperature sensor 10 between outlet;The plate heat exchanger 6 evaporates side outlet and the compression Third temperature sensor 11 is equipped between 1 jet import of machine;High pressure pressure is equipped between the oil eliminator 2 and the four-way valve 3 Force snesor 15.
First temperature sensor 9, second temperature sensor 10, third temperature sensor 11 and high-pressure pressure sensor 15 are connected with the input terminal of master control borad respectively, and the output end of the master control borad connects the jet electric expansion valve 7.
The air-conditioner set is multi-gang air-conditioner unit, and the jet pipeline inside air injection enthalpy-increasing compressor therein has Check valve, and it is suitable for the bear down on one degree of superheat and the dual accurate control of the plate heat exchanger degree of superheat.
As shown in Fig. 2, a kind of control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, comprising the following steps:
Step 1: best jet amount carries out corresponding compressor tonifying Qi electric expansion valve according to the degree of superheat of bearing down on one of compressor Switch control keeps compressor not overheat or run with liquid, it may be assumed that T-SH1=TBear down on one-TCondensation
Step 2: one target of setting is beared down on one degree of superheat T- SH1- mesh, the initial opening P of electric expansion valve0
In the implementation case, setting target is beared down on one degree of superheat T- SH1- mesh=20 DEG C, the initial opening of electric expansion valve is P0= 60P。
Step 3: the t when the multi-gang air-conditioner machine set compressor runs full first predetermined time1, run according to unit real Bear down on one degree of superheat T on border- SH1- is practicalBear down on one degree of superheat T with the target of setting- SH1- meshDifference carry out jet electric expansion valve switch Control.
In the implementation case, after compressor, which is in the operation phase, expires 10min, start to detect actually bearing down on one for unit Temperature T- SH1- is practicalBear down on one degree of superheat T with the target of setting- SH1- meshSize, if bearing down on one degree of superheat T- SH1- is practical>=20+3 DEG C when, institute It states jet electric expansion valve and is opened into initial opening 60P0
Step 4: the jet electric expansion valve is opened into initial opening P0Adjusting afterwards is controlled in the following way, Each regulating cycle is the second predetermined time t2:
T- SH6- is practical> T- SH6- mesh+△T2When,
Jet electric expansion valve acts step number aperture=(T- SH6- is practical- T- SH6- mesh) × adjustment factor 1;
T- SH6- mesh- △ T2≤T- SH6- is practical≤T- SH6- mesh+△T2When, the jet electric expansion valve (7) is failure to actuate, and keeps former Aperture is constant;
T- SH6- is practical< T- SH6- mesh- △ T2When, jet electronic expansion valve opening=(T- SH6- is practical- T- SH6- mesh) × adjustment factor 2。
In the implementation case, the board-like degree of superheat T of target is set- SH6- mesh=5 DEG C, the second predetermined time t2For 80s, the △ T2=2 DEG C, adjustment factor 1=0.5, adjustment factor 2=1;
Work as T- SH6- is practicalAt >=7 DEG C, jet electric expansion valve acts step number aperture=(T- SH6- is practical- T- SH6- mesh) × 0.5;
Work as T- SH6- is practicalAt 3 DEG C of <, jet electric expansion valve acts step number aperture=(T- SH6- is practical- T- SH6- mesh) × 1;
As 3≤T- SH6- is practicalAt≤7 DEG C, jet electric expansion valve movement step number aperture is remained stationary.
Calculated result value is that positive number represents valve and opens greatly, calculated result value for negative represent valve open it is small.
Step 5: in unit operation, if T- SH1- is practical< T- SH1- target- △ T 1When reach third predetermined time t3, the spray Gas electric expansion valve is closed.
In the implementation case, as the degree of superheat T that bears down on one of compressor- SH1- is practical17 DEG C of <, and when lasting 5min, sprayer electronics Expansion valve is closed.
In conclusion the present invention carries out opening for corresponding compressor jet electric expansion valve according to the degree of superheat of bearing down on one of compressor Control is closed, is controlled according to the aperture regulation that the degree of superheat of plate heat exchanger carries out corresponding compressor jet electric expansion valve, effectively It ensure that compressor will not be overheated or be run with liquid, control optimized to existing air injection enthalpy-increasing system jet amount, it is ensured that spray Tolerance reaches most preferably, not only can guarantee unit operation stability, but also can improve unit efficiency.
Part that the present invention does not relate to is the same as those in the prior art or can be realized by using the prior art.

Claims (6)

1. a kind of control system of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount, it is characterized in that including being sequentially connected and constituting The compressor (1) in circuit, oil eliminator (2), four-way valve (3), outdoor unit heat exchanger (4), heating electronic expansion valve module (5), Plate heat exchanger (6), jet electric expansion valve (7), gas-liquid separator (8), electronic expansion valve of indoor unit (13) and indoor unit change Hot device (14);
The compressor (1) is air injection enthalpy-increasing compressor, and outlet is connected with the oil eliminator (2) import, the oil Outlet from device (2) is connect with the import of the four-way valve (3), C pipe and the outdoor unit heat exchanger of the four-way valve (3) (4) refrigerant inlet connection, the refrigerant outlet of the outdoor unit heat exchanger (4) access the heating electronic expansion valve group The import of part (5), the import that cold side is crossed in the outlet and the plate heat exchanger (6) of heating electronic expansion valve module (5) connect It connects, the outlet that the plate heat exchanger (6) crosses cold side divides two-way, connect all the way with jet electric expansion valve (7) import, separately It is connected respectively with the electronic expansion valve of indoor unit (13) import of corresponding indoor unit by several branch pipes all the way, it is described The outlet of jet electric expansion valve (7) is connect with the evaporation side-entrance of the plate heat exchanger (6), the plate heat exchanger (6) evaporation side outlet is connect with the compressor (1) jet import;The outlet of each indoor set heat exchanger (14) passes through each From branch pipe merge after lead to outdoor and be connected with the E mouth of the four-way valve (3), the S mouth and the gas of the four-way valve (3) The import of liquid/gas separator (8) is connected, and the outlet of the gas-liquid separator (8) is connected with the compressor (1) air entry;
The first temperature sensor (9) are equipped at the top of the compressor (1);The plate heat exchanger (6) evaporation side-entrance with it is described Jet electric expansion valve (7) is equipped with second temperature sensor (10) between outlet;The plate heat exchanger (6) evaporation side outlet with Third temperature sensor (11) are equipped between compressor (1) the jet import;The oil eliminator (2) and the four-way valve (3) high-pressure pressure sensor (15) are equipped between;
First temperature sensor (9), second temperature sensor (10), third temperature sensor (11) and high-pressure sensing Device (15) is connected with the input terminal of master control borad respectively, and the output end of the master control borad connects the jet electric expansion valve (7);
The air-conditioner set is multi-gang air-conditioner unit, and wherein the inside jet pipeline of air injection enthalpy-increasing compressor is with unidirectional Valve, and it is suitable for the bear down on one degree of superheat and the dual accurate control of the plate heat exchanger degree of superheat.
2. a kind of control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount according to claim 1, it is characterized in that including Following steps:
Step 1: acquisition the first temperature sensor (9) temperature value and the high-pressure pressure sensor (15) pressure value pass through The master control borad calculates the air injection enthalpy-increasing compressor (1) and bears down on one degree of superheat T-SH1, and calculated value when comparing actual motion T-SH1- is practicalWith target value T-SH1- meshSize, output control signal controls the switch of the jet electric expansion valve (7);
Step 2: the temperature value of the second temperature sensor (10) Yu the third temperature sensor (11) is acquired, by described Master control borad calculates plate heat exchanger (6) the evaporation side degree of superheat T-SH6;Practical plate heat exchanger (6) evaporation is run according to unit Side degree of superheat T-SH6- is practicalWith the target value T- of settingSH6- meshDifference the aperture of electric expansion valve is adjusted;
Step 3: after compressor actual motion reaches the first predetermined time t1, if the degree of superheat T- that bears down on one of compressorSH1- is practical≥ T-SH1- mesh +△T 1DEG C when, the jet electric expansion valve (7) is opened into initial opening P0
Step 4: the jet electric expansion valve (7) is opened into initial opening P0Adjusting afterwards is controlled in the following way, often A regulating cycle is the second predetermined time t2:T-SH6- is practical> T-SH6- mesh+△T2When, jet electric expansion valve movement step number aperture= (T-SH6- is practical- T-SH6- mesh) × adjustment factor 1;T-SH6- mesh- △ T2≤T-SH6- is practical≤T-SH6- mesh+△T2When, the jet electronics Expansion valve (7) is failure to actuate, and keeps former aperture constant;T-SH6- is practical< T-SH6- mesh- △ T2When, jet electric expansion valve acts step number Aperture=(T-SH6- is practical- T-SH6- mesh) × adjustment factor 2;
Step 5: in unit operation, if T-SH1- is practical< T-SH1- mesh- △ T 1When, reach third predetermined time t3, the jet electricity Sub- expansion valve (7) is closed.
3. the control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount according to claim 2, it is characterized in that described The degree of superheat target value T- that bears down on one in step 1SH1- meshIt is 15~20 DEG C.
4. the control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount according to claim 2, it is characterized in that described The plate heat exchanger evaporation side degree of superheat T- in step 2SH6- meshIt is 3~5 DEG C.
5. the control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount according to claim 2, it is characterized in that described First predetermined time t1 described in step 3 is 10min, the △ T1=3℃。
6. the control method of multi-gang air-conditioner unit air injection enthalpy-increasing jet amount according to claim 2, it is characterized in that described Second predetermined time t2 in step 4 is 80s, the △ T2=2℃;The adjusting of the jet electric expansion valve (7) simultaneously 1≤adjustment factor of coefficient 2.
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