CN208652788U - Wide temperature all-fresh air step-less adjustment refrigerating plant - Google Patents

Abstract

The utility model discloses a kind of wide warm all-fresh air step-less adjustment refrigerating plants, the refrigeration system of evaporator is respectively provided with including three-level, the evaporator of three-level refrigeration system is arranged in air duct, electric heater is equipped in the air duct at every grade of evaporator rear, it further include controller, controller is electrically connected with each refrigeration system, each electric heater respectively.The advantages of the utility model can realize wide warm all-fresh air step-less adjustment, realize wide warm refrigeration work, and three-level refrigeration is optionally opened under conditions of operating condition is not severe, has structure simple, easy to use, easy to maintenance, high reliablity.

Description

Wide temperature all-fresh air step-less adjustment refrigerating plant

Technical field

The utility model relates to conditioner field, specifically a kind of wide warm all-fresh air step-less adjustment refrigerating plant.

Background technique

Environment progress air conditioning needs air output big in special equipment, and refrigeration needs to accomplish step-less adjustment, and heating needs Multistage adjusting is carried out, return air is needed using all-fresh air, and in addition use environment temperature (- 45 DEG C -55 DEG C) range is wide, supply air temperature It is required that low, dehumidification requirements are reliably stringent.Under worst hot case (such as environment temperature be 55 DEG C), supply air temperature also requires lower, send Return air temperature difference extreme value is larger, is difficult to directly reach using single-stage refrigeration.

Currently, the adjusting of cooling capacity usually has unloading, electro-thermal equilibrium, variable frequency adjustment.Unloading is usually that multicylinder compressor is closed A part of cylinder realizes the sectional-regulated of refrigerating capacity, usually there is two grades (50%, 100%) and third gear (33%, 66%, 100%) It adjusts, can not accomplish the step-less adjustment of cooling capacity；Electro-thermal equilibrium is that cold regulation measure is not done in refrigerating circuit, when cooling capacity obtained is more When leading to too low air temperature, air themperature is promoted up to balance extra cooling capacity by the heater after evaporator, , it can be achieved that the step-less adjustment of heating if electric heating uses SCR control, to play the role of cooling capacity step-less adjustment indirectly, Compressor fully operates at this time, while electric heating is also run, therefore electro-thermal equilibrium is least energy-efficient one in several regulative modes Kind；Variable frequency adjustment is the frequency converter by connecting with compressor to change the frequency of compressor electric motor, and then changes compressor Revolving speed, to realize the step-less adjustment to cooling capacity；Also have the function of reducing compressor start electric current simultaneously；While frequency reducing, pressure The power of contracting machine equally reduces, the most energy saving in several regulative modes, but the selection of converter module will meet severe work Make the requirement of environment, environment temperature height is with high requirements and high cost to converter module, and reliability reduces.

Heating need to accomplish step-less adjustment, and heating at present has heat pump heating, fuel Heating and electric heating.Generally, due to various The heating combined equipment of the air conditioning of special equipment (such as vehicle) needs work in the low temperature environment of field, therefore to the system of air conditioning More stringent requirements are proposed for thermal.And heat pump heating heating effect in the case where -45 DEG C of low temperature is excessively poor, it cannot be to need to add The space of heat carries out air conditioning；Fuel heater needs to increase corresponding finned heat exchanger, utilizes combustion heat-exchange principle, heating Medium in finned heat exchanger, and then the air for flowing through fin is heated, fuel heater controls heat exchange by flow control valve The flow of medium in device, and then the purpose for adjusting heating amount is played, it can accomplish step-less adjustment, but fuel heater structure is more multiple Miscellaneous, fault point is more, and reliability is low；Electric heating is to convert electrical energy into thermal energy using the Joule effect of electric current, is flowed through with heating The air of heater, there are two types of modes for electric heating: electrothermal tube and " PTC " heater, " PTC " is by ceramic heating element parallel connection group It is formed with ripple aluminum strip through high temperature is cementing after conjunction, electric heating tube is that outer casing stainless steel pipe forms after heating wire wraps up magnesium powder, the two Characteristic is different in power output, and " PTC " output power changes with the variation of environment temperature and face velocity, in non- Linearly, and after work 1000h power has certain attenuation, and electric heating tube output power is relative constant, using embedded electric heating Heating mode, electric heating tube is closely attached with heat exchanger together with, this mode not only effectively improves changing for equipment The thermal efficiency, and the heat exchange area because increasing heating device and air, so that heating device surface temperature substantially reduces, thus The generation that open fire can be effectively prevented, is easily installed electric safety device, improves the safety electric performance of equipment.

Utility model content

The purpose of the utility model is to provide a kind of wide warm all-fresh air step-less adjustment refrigerating plants, to solve prior art sky The problem of modulating cold, dehumidifying, heating, cooling capacity step-less adjustment and environmental Kuznets Curves accuracy.

In order to achieve the above object, the technology employed by the present utility model is

Wide temperature all-fresh air step-less adjustment refrigerating plant, it is characterised in that: the refrigeration system of evaporator is respectively provided with including three-level System, the evaporator of three-level refrigeration system are successively set in sequence in air duct from front to back, wherein the system where rear double effect evaporator Cooling system is frequency changing refrigeration system respectively, and electric heater, the most evaporation of rear side are equipped in the air duct between two neighboring evaporator Device rear also is provided with electric heater in air duct, further includes controller, controller respectively with each refrigeration system, each electric heater Electrical connection.

The warm all-fresh air step-less adjustment refrigerating plant of the width, it is characterised in that: every grade of refrigeration system respectively includes gas-liquid Separator, compressor, condenser, liquid storage device, filter, expansion valve, evaporator, the expansion valve are electric expansion valve, evaporation Device one end passes sequentially through gas-liquid separator, compressor, condenser, liquid storage device, filter, expansion valve and the evaporator other end and connects Circuit is constituted, and condenser is each configured with axial flow blower in every grade of refrigeration system, system belonging to rear double effect evaporator in air duct Compressor is frequency-changeable compressor in cooling system；The controller respectively in each refrigeration system compressor, axial flow blower, Expansion valve electrical connection.

The warm all-fresh air step-less adjustment refrigerating plant of the width, it is characterised in that: the import of each evaporator, each condensation The import of device is respectively equipped with temperature sensor, and each temperature sensor is electrically connected with the controller respectively.

The warm all-fresh air step-less adjustment refrigerating plant of the width, it is characterised in that: each evaporator, each electric heater exist A centrifugal blower is shared in air duct, the controller is electrically connected with centrifugal blower.

The described warm all-fresh air step-less adjustment refrigerating plant of width, it is characterised in that: the boot sequence of three-level refrigeration system is Successively start from back to front, and is judged whether to start rear stage system according to temperature when previous stage refrigeration system starts by controller Cooling system.

Three-level refrigeration system can be used in the utility model, and the evaporator of three-level refrigeration system is successively set in air duct, and Three-level refrigeration system is optionally opened under conditions of operating condition is not severe, and when wherein certain grade breaks down, other classifications are still It can guarantee the certain work of system, three-level refrigeration system is more energy efficient compared with single level system reliable.But merely also not with variable frequency adjustment It is economical, reliable, to guarantee temperature-controlled precision, combine cost and reliability, therefore previous stage is freezed using fixed frequency, behind two, Three-level refrigeration uses variable frequency adjustment, and a failure still ensures that stepless adjustable, the preferential unlatching of third level refrigeration, according to environmental working condition Condition successively opens second level refrigeration and first order refrigeration；In addition heating mode using multi gear electric heating and utilizes silicon-controlled realization electricity The step-less adjustment of heating, in order to improve system reliability and interchangeability, electric heating is set as three groups, is respectively placed in evaporations at different levels Device rear.

The utility model refrigeration work mode: third level refrigeration system, second level refrigeration system, first order refrigeration system are pressed Sequence successively opened from back to front.The operation of third level refrigeration system, inner compressor use frequency conversion soft start, starting Judged after first running 10min afterwards with 50Hz further according to actual value and setting value, determines frequency.Evaporating pressure and temperature value The aperture of electric expansion valve is controlled.And in compressor start, initial pressure is too high or too low, high load capacity, underload Etc. the aperture that can efficiently, accurately adjust electric expansion valve under different operating conditions, frequency modulation is carried out with the speed of 2Hz/min, is adjusted to 70Hz, such as still needs to freeze, then opens second level refrigeration system, determines that compressor adds unloading feelings according to temperature gap after ten minutes Condition decides whether to open first order refrigeration system after twenty minutes according to temperature gap.

The utility model dehumidification work mode: three-level refrigerated dehumidification: outdoor fresh air → first order cooling and dehumidifying → (heating) → second level cooling and dehumidifying → (heating) → third level cooling and dehumidifying (stepless) → (heating)；Second level refrigerated dehumidification (refrigeration system 20 work): outdoor fresh air → second level cooling and dehumidifying → (rising again) → third level cooling and dehumidifying (stepless) → (heating)；Level-one system Cold dehumidifying (work of refrigeration system 10): outdoor fresh air → third pole cooling and dehumidifying (stepless) → (heating)

The utility model heats operating mode: outdoor fresh air heating

As shown from the above technical solution, the utility model increases three-level steaming on the basis of one-stage steam compressed refrigeration cycle Air pressure contraction SAPMAC method, three-level refrigeration are optionally opened under conditions of operating condition is not severe, and wherein certain grade breaks down When, other classifications still ensure that the certain work of system, and three-level system is more energy efficient compared with single level system reliable.The utility model exists Increase three-level electric heating on the basis of single-stage is electrically heated, can realize dehumidification requirements at low ambient temperatures.By can It controls silicon control electric heating and realizes that the multistage of heating is adjusted.Level-one uses not frequency conversion in three-level refrigeration, two, three-level use frequency conversion can be with It realizes and realizes refrigeration cool-down three-level refrigeration needs full open under worst hot case, advantageously reduce cost, and realize Wide temperature all-fresh air step-less adjustment, improves reliability.

The utility model has the beneficial effects that:

1) it realizes wide warm all-fresh air step-less adjustment, realizes wide warm refrigeration work, realize cooling heat exchange under lower temperature, realize Multistage heating is realized in dehumidifying.

2) three-level refrigeration is optionally opened under conditions of operating condition is not severe, when wherein certain grade breaks down, other Classification still ensures that the certain work of system, and three-level system is more energy efficient compared with single level system reliable.

3) structure is simple, easy to use, easy to maintenance, high reliablity.

Detailed description of the invention

Fig. 1 is the system schematic of the utility model.

Specific embodiment

The present invention will be further described with reference to the accompanying drawings and examples.

As shown in Figure 1, wide temperature all-fresh air step-less adjustment refrigerating plant, by first order refrigeration system 10, first order electric heating Device 1, second level refrigeration system 20, second level electric heater 2, third level refrigeration system 30, third level electric heater 3 form, and add Thermal recovery SCR control electric heater, after first order electric heater 1 is placed in the evaporator 16 of first order refrigeration system 10, second After grade evaporator 26 is placed in first order electric heater 1, after second level electric heater 2 is placed in second level evaporator 26, the third level is steamed After hair device 36 is placed in second level electric heater 2, after third level electric heater 3 is placed in third evaporator 36, first evaporator 16, first order electric heater 1, second level evaporator 26, second level electric heater 2, third evaporator 36, third level electric heating Device 3 is arranged in air duct by tandem, and a centrifugal blower 7 is shared in air duct.

First order refrigeration system 10 is by compressor 11, condenser 12, liquid storage device 13, filter 14, expansion valve 15, the first order Evaporator 16, gas-liquid separator 17 pass sequentially through piping connection into circuit, and expansion valve 15 uses electric expansion valve.Second level refrigeration System 20 is by compressor 21, condenser 22, liquid storage device 23, filter 24, expansion valve 25, first evaporator 26, gas-liquid separation Device 27 passes sequentially through piping connection into circuit, and compressor 21 uses frequency-changeable compressor, and expansion valve 25 uses electric expansion valve.Third Grade refrigeration system 30 is by compressor 31, condenser 32, liquid storage device 33, filter 34, expansion valve 35, third evaporator 36, gas Liquid/gas separator 37 passes sequentially through piping connection into circuit, and compressor 31 uses frequency-changeable compressor, and expansion valve 35 uses electronic expansion Valve.

Each evaporator air inlet is equipped with the first temperature sensor, and each condenser air inlet any place is passed equipped with second temperature Sensor, compressor 11, compressor 21, compressor 31, axial flow blower 4, axial flow blower 5, axial flow blower 6, centrifugal blower 7, expansion Valve 15, expansion valve 25, expansion valve 35, first order electric heater 1, second level electric heater 2, third level electric heater 3 respectively with Controller is connected.

Refrigeration system workflow: 34 → electric expansion valve of compressor 31 → condenser, 32 → liquid storage device, 33 → filter 35 36 → gas-liquid separator of → evaporator, 37 → compressor 31；23 → filter of compressor 21 → condenser, 22 → liquid storage device 24 → electricity 26 → gas-liquid separator of sub- 25 → evaporator of expansion valve, 27 → compressor 21；Compressor 21 → condenser, 22 → liquid storage device, 23 → mistake 27 → compressor of filter 24 → electric expansion valve, 25 → evaporator, 26 → gas-liquid separator 21.

The utility model refrigeration work mode: it is opened by the sequence of refrigeration system 30, refrigeration system 20, refrigeration system 10 It opens.Refrigeration system 30 run, compressor 31 use frequency conversion soft start, after starting first with 50Hz run 10min after further according to reality Value is judged with setting value, determines frequency.Evaporating pressure and temperature value control the aperture of electric expansion valve.And It can efficiently, accurately be adjusted in compressor start, under the different operating conditions such as initial pressure is too high or too low, high load capacity, underload The aperture of electric expansion valve, frequency modulation are carried out with the speed of 2Hz/min, are adjusted to 70Hz, such as still need to freeze, then open refrigeration system 20, it determines that compressor adds unloading situation according to temperature gap after ten minutes, decides whether to open according to temperature gap after twenty minutes Refrigeration system 10.

The utility model dehumidification work mode:

1) three-level refrigerated dehumidification (work of refrigeration system 30): outdoor fresh air → first order cooling and dehumidifying → (heating) → second Grade cooling and dehumidifying → (heating) → third level cooling and dehumidifying (stepless) → (heating)

2) second level refrigerated dehumidification (work of refrigeration system 20): outdoor fresh air → second level cooling and dehumidifying → (rising again) → third Grade cooling and dehumidifying (stepless) → (heating)

3) level-one refrigerated dehumidification (work of refrigeration system 10): outdoor fresh air → third pole cooling and dehumidifying (stepless) → (heating)

The utility model heats operating mode: outdoor fresh air → heating.

Claims (5)

1. wide temperature all-fresh air step-less adjustment refrigerating plant, it is characterised in that: the refrigeration system of evaporator is respectively provided with including three-level, The evaporator of three-level refrigeration system is successively set in sequence in air duct from front to back, wherein the refrigeration system where rear double effect evaporator System be frequency changing refrigeration system respectively, in the air duct between two neighboring evaporator be equipped with electric heater, most rear side evaporator after It also is provided with electric heater in Fang Fengdao, further includes controller, controller is electrically connected with each refrigeration system, each electric heater respectively It connects.

2. wide warm all-fresh air step-less adjustment refrigerating plant according to claim 1, it is characterised in that: every grade of refrigeration system point Not Bao Kuo gas-liquid separator, compressor, condenser, liquid storage device, filter, expansion valve, evaporator, the expansion valve be electronics it is swollen Swollen valve, evaporator one end pass sequentially through gas-liquid separator, compressor, condenser, liquid storage device, filter, expansion valve and evaporator The other end connects and composes circuit, and condenser is each configured with axial flow blower, rear double flash evaporation in air duct in every grade of refrigeration system Compressor is frequency-changeable compressor in refrigeration system belonging to device；The controller respectively with the compression in each refrigeration system Machine, axial flow blower, expansion valve electrical connection.

3. wide warm all-fresh air step-less adjustment refrigerating plant according to claim 2, it is characterised in that: each evaporator into The import of mouth, each condenser is respectively equipped with temperature sensor, and each temperature sensor is electrically connected with the controller respectively.

4. wide warm all-fresh air step-less adjustment refrigerating plant according to claim 1, it is characterised in that: each evaporator, each A electric heater shares a centrifugal blower in air duct, and the controller is electrically connected with centrifugal blower.

5. wide warm all-fresh air step-less adjustment refrigerating plant according to claim 1, it is characterised in that: three-level refrigeration system Boot sequence is successively to start from back to front, and judge whether to open according to temperature when previous stage refrigeration system starts by controller Dynamic rear stage refrigeration system.