CN101846413A - Unitary air-conditioning unit of subway vehicle and control method thereof - Google Patents

Abstract

The invention discloses a unitary air-conditioning unit of a subway vehicle and a control method thereof, which belong to the field of air-conditioning ventilation systems of subway vehicles. The unitary air-conditioning unit comprises at least two independent refrigeration loops, wherein each refrigeration loop comprises a compressor, a condenser communicated with one end of the compressor and an evaporator coiled pipe communicated with one end of the condenser; the evaporator coiled pipe is communicated with the other end of the compressor to form a closed loop; the evaporator coiled pipe is positioned in an evaporator; an air feeder is arranged on one side of the evaporator; and at least two parallel compressors are arranged in each independent refrigeration loop. The control method is realized by adjusting the starting and stopping number of the compressors in various independent refrigeration loops according to the detected refrigeration load capacity in the vehicle, so that the refrigeration loops for working are the most. The invention has the advantages of multistage adjustment of refrigerating capacity, full utilization of the heat exchange area of the condenser and the evaporator, high refrigeration efficiency, good energy-saving effect, high uniformity for air temperature in the vehicle, small temperature fluctuation and high comfort feeling for passengers.

Description

A kind of railcar unitary air conditioner unit and control method thereof

Technical field

The present invention relates to the air conditioner of subway vehicle ventilating system, be specially a kind of railcar unitary air conditioner unit and control method thereof.

Background technology

Two independently refrigerating circuits of the general employing of present domestic air conditioner of subway vehicle unit, as shown in Figure 1, each loop comprises that a power is about the compressor 1 of 6.5KW, thecondenser 2 that is connected with compressor 1, theevaporator coil 6 that is connected withcondenser 2; Thisevaporator coil 6 is connected with compressor 1.Theevaporator coil 6 that comprises two groups of parallel connections in the described independent cooling loop, theevaporator coil 60 that comprises two groups of parallel connections in another independent cooling loop, one group ofevaporator coil 6 in this independent cooling loop is arranged insame evaporimeter 3 with one group ofevaporator coil 60 in another independent cooling loop, and anothergroup evaporator coil 6 in this independent cooling loop is arranged insame evaporimeter 30 with anothergroup evaporator coil 60 in another independent cooling loop.

As can be seen from Figure 1, each independently refrigerating circuit comprise 1 compressor, 1 condenser, 2 * 0.5 evaporimeters and other refrigeration part, wherein 0.5 evaporimeter meaning is that one group of evaporator coil is equivalent to half of whole evaporimeter in the single independently refrigerating circuit to the refrigeration of surrounding air, promptly by 0.5 evaporimeter, and comprise the evaporator coil of two groups of parallel connections in the single independently refrigerating circuit, be 2 * 0.5 evaporimeters therefore.

Compressed machine compression back gas is sent in the condenser by pipeline, gas behind condenser is sent in the evaporimeter, then by the pressure fan that is located at evaporimeter one side, air behind the air-conditioning is sent in the compartment, regulate the temperature in the compartment, and, regulate refrigerating capacity by controlling the start-stop of compressor operating, satisfy refrigeration demand in the car thereby hope.

Yet because existing subway vehicle air conditioning unit only can be realized refrigerating capacity 50% and 100% two grade of adjusting, and cooling load is subjected to influence that Changes in weather and passengers quantity change greatly in the railcar car, two grades of refrigerating capacitys are regulated and are caused in the compartment temperature fluctuation bigger, temperature control inaccuracy, and efficiency is not high, energy consumption is big, can't guarantee that the vehicle interior temperature fluctuation is little, and therefore the passenger also feels uncomfortable.

Summary of the invention

Big in order to overcome existing air conditioner of subway vehicle unit refrigerating capacity adjusting span, temperature control inaccuracy, the passenger is uncomfortable, and efficiency is not high, the deficiency that energy consumption is big, one object of the present invention is to provide a kind of railcar unitary air conditioner unit, this air-conditioning unit can carry out multistage adjusting to refrigerating capacity according to refrigeration demand, and vehicle interior temperature control is more accurate, and temperature fluctuation is little, and energy-saving effect is remarkable, and passenger's comfort is good.

To achieve these goals, the technical solution adopted in the present invention is: a kind of railcar unitary air conditioner unit, comprise at least two independently refrigerating circuits, and each refrigerating circuit comprises compressor, the condenser that is connected with compressor one end, the evaporator coil that is connected with condenser one end; This evaporator coil is connected with the compressor other end and constitutes the closed-loop path; Described evaporator coil is arranged in evaporimeter, and this evaporimeter one side is provided with pressure fan, and its design feature is to comprise the compressor of at least two parallel connections in each independent cooling loop.

For cooling velocity and the cooling effect that improves condenser, a side of described condenser is provided with condensation fan.

The evaporator coil that comprises two groups of parallel connections in described each independent cooling loop, one group of evaporator coil in this independent cooling loop places same evaporimeter with one group of evaporator coil in another one or a plurality of refrigerating circuit.

The return air inlet of described air-conditioning unit is provided with the return air temperature sensor of cooling load in the inspection vehicle, the equal correspondence of each compressor one side is provided with the contactor that can make each compressor start and stop, and described return air temperature sensor and can be controlled the air-conditioner controller of each contactor folding.

Further purpose of the present invention is to provide a kind of control method of the vehicle unit of subway as mentioned above formula air-conditioning unit, at first, and cooling load amount in the inspection vehicle; Regulate respectively the start and stop platform number of compressor in the independently refrigerating circuit then according to cooling load amount in the car that detects, make that the refrigerating circuit quantity of work is maximum.When the cooling load amount is higher in the car, open compression board number and increase, when in the car during cooling load amount, open compression board number and reduce.When vehicle interior temperature one regularly, when bootable compressor had multiple choices, the compressor of startup can farthest utilize the condenser in the air-conditioning unit of the present invention and the heat exchange area of evaporimeter.

Compressor is sent into condensing agent compression back in the condenser by pipeline, condensing agent under the condensation fan effect after condenser condenses divides two-way to enter in the evaporator coil by pipeline, and the evaporator coil ambient air cooled off, by pressure fan cooled air is sent in the compartment then, condensing agent temperature in the evaporator coil raises at this moment, become gas, be back to and continue circularly cooling in the compressor.

The cooling load amount is preferably by the return air temperature sensor of the return air inlet that is arranged on the air-conditioning unit and gives air-conditioner controller with the vehicle interior temperature transfer of data in the described inspection vehicle, the cooling load amount is controlled the folding of each contactor respectively in the car that records according to return air temperature sensor of air-conditioner controller then, thereby controls the start and stop of each compressor.

The return air temperature sensor that is located at air-conditioning unit return air inlet is given air-conditioner controller with the vehicle interior temperature transfer of data, air-conditioner controller calculates refrigeration demand in the car according to the vehicle interior temperature data, and the contactor in the air-conditioning system controlled automatically, described contactor disconnects, then Dui Ying compressor quits work, the contactor closed communicating, the compressor starts work of a then corresponding side, can be in real time by the temperature in the start and stop adjusting compartment of compressor, improve the refrigerating efficiency of air-conditioning unit and/or cut down the consumption of energy, improve passenger's comfort, also reached purpose of energy saving simultaneously.

When above-described air-conditioning unit comprises two independently refrigerating circuits, comprise the compressor of two parallel connections in each independent cooling loop, its control method is:

A), when cooling load is lower than 25% in return air temperature sensor records car, the air-conditioner controller output signal, the contactor in four contactors is closed to be connected, the compressor in four compressors is started working.

B), cooling load is higher than 25% and be lower than 50% in return air temperature sensor records car, the air-conditioner controller output signal, contactor in four contactors and contactor are closed to be connected, and the compressor in the compressor in the first independent cooling loop and the second independent cooling loop carries out work.

C), cooling load is higher than 50% and when being lower than 75% in return air temperature sensor records car, the air-conditioner controller output signal, contactor in four contactors, contactor, contactor is closed connects, two compressors of opening in the first independent cooling loop carry out work, and a compressor of opening in the second independent cooling loop carries out work.

D), cooling load is higher than 75% and when being lower than 100% in return air temperature sensor records car, the air-conditioner controller output signal, contactor, contactor, contactor, contactor are all closed to be connected, and opens all four compressors in two independent cooling loops.

When refrigeration in the car did not reach at full capacity, air-conditioner controller can be controlled the operating state of each compressor in real time according to the cooling load in the compartment, guaranteed passenger's comfortableness, thereby also reached purpose of energy saving.

Compared with prior art, the invention has the beneficial effects as follows: refrigerating capacity of the present invention can multistagely be regulated, and can control automatically in real time, made full use of the heat exchange area of condenser and evaporimeter, the refrigerating efficiency height, air themperature uniformity height in the good energy-conserving effect, vehicle, temperature fluctuation is littler, and passenger's comfort is higher.

Description of drawings

The invention will be further described below in conjunction with drawings and Examples.

Fig. 1 is existing air conditioner of subway vehicle unit refrigeration cyclic graph;

Fig. 2 is the refrigeration cyclic graph of one embodiment of the invention;

Fig. 3 is the one embodiment of the invention structured flowchart of control automatically;

Fig. 4 is the one embodiment of the invention practical circuit diagram of control automatically.

In the drawings

1,11,12,13, the 14-compressor; The 2-condenser; 3, the 30-evaporimeter;

The 4-pressure fan; The 5-condenser fan; 6, the 60-evaporator coil;

21,22,23, the 24-contactor; The 7-air-conditioner controller; The 8-return air temperature sensor.

The specific embodiment

A kind of railcar unitary air conditioner unit, as shown in Figure 2, comprise two independently refrigerating circuits, first refrigerating circuit comprises that the power of two parallel connections is thecompressor 11,12 of 3.3KW, withcompressor 11, thecondenser 2 that 12 1 ends are connected, with theevaporator coil 6 that condenser 2 one ends are connected, thisevaporator coil 6 is connected withcompressor 11,12 other ends and constitutes the closed-loop path; Second refrigerating circuit comprises that the power of two parallel connections is thecompressor 13,14 of 3.3KW, withcompressor 13, thecondenser 2 that 14 1 ends are connected, with theevaporator coil 60 thatcondenser 2 one ends are connected, thisevaporator coil 60 is connected withcompressor 13,14 other ends and constitutes the closed-loop path.The described first independent cooling loop comprises theevaporator coil 6 of two groups of parallel connections, theevaporator coil 60 that comprises two groups of parallel connections in the second independent cooling loop, one group ofevaporator coil 6 in the first independent cooling loop places anothergroup evaporator coil 6 insame evaporimeter 3, the first independent cooling loops to place with anotherevaporimeter 30 with anothergroup evaporator coil 60 in second refrigerating circuit with one group ofevaporator coil 60 in second refrigerating circuit.

For cooling velocity and the cooling effect that improvescondenser 2, a side of describedcondenser 2 is provided withcondensation fan 5.

Evaporimeter 3,30 one sides are equipped with pressure fan 4, are convenient in time will be delivered in the compartment by the air ofevaporimeter 3,30 refrigeration apace.

Compressor 11,12,13,14 will send in thecondenser 2 by pipeline after the condensing agent compression, divide two-way to enter in theevaporator coil 6 by pipeline throughcondenser 2 condensed condensing agents undercondensation fan 5 effects, andevaporator coil 6 ambient airs are cooled off, by pressure fan 4 cooled air is sent in the compartment then, condensing agent temperature in theevaporator coil 6 raises at this moment, becomes gas, is back to and continues circularly cooling in the compressor.

A kind of control method of the vehicle unit of subway as mentioned above formula air-conditioning unit, but the return air temperature sensor 8 of cooling load in the return air inlet setting inspection vehicle of described air-conditioning unit, as shown in Figure 3 and Figure 4, this return air temperature sensor 8 is given 7, fourcompressors 11 of air-conditioner controller with the vehicle interior temperature transfer of data, 12, the equal correspondence of 13,14 one sides is provided with fourcontactors 21,22,23,24, described air-conditioner controller 7 is controlled fourcontactors 21,22 respectively according to cooling load amount in the car, 23,24 folding, thus fourcompressors 11,12 controlled, 13,14 start and stop.

The return air temperature sensor 8 that is located at air-conditioning unit return air inlet is given air-conditioner controller 7 with the vehicle interior temperature transfer of data, air-conditioner controller 7 calculates refrigeration demand in the car according to the vehicle interior temperature data, and to the contactor in the air-conditioning system 21,22,23,24 control automatically, described contactor disconnects, then Dui Ying compressor quits work, the contactor closed communicating, the compressor starts work of a then corresponding side can be in real time by the temperature in the start and stop adjusting compartment of compressor, improve passenger's comfort, also reached purpose of energy saving simultaneously.

Fig. 4 is the one embodiment of the invention practical circuit diagram of control automatically, wherein the circuit diagram left side is the work loop feature, fourcompressors 11,12,13, be provided with fourcontactors 21 of its start and stop of control in 14 the operating circuit, 22,23,24, the circuit diagram right side is the control loop part, the cooling load amount is controlled fourcontactors 21,22,23 respectively in the car that air-conditioner controller 7 records according to returnair temperature sensor 8,24 folding, the circuit diagram upper left corner is the working power of air-conditioning unit, and concrete parameter is AC380V, 50Hz, the circuit diagram upper right corner is the control loop power supply, and concrete parameter is DC110V.

Concrete control procedure is:

A), when return air temperature sensor 8 records that cooling load is lower than 25% in the car, air-conditioner controller 7 output signals, fourcontactors 21,22,CPK11 contactor 21 closed connections in 23,24, thecompressor 11 in four compressors is started working, this moment, the compressor power consumption was lower than half of existing air-conditioning unit, and refrigerating efficiency has small size raising.

B), when recording in the car cooling load, return air temperature sensor 8 is higher than 25% and be lower than 50%, air-conditioner controller 7 output signals, fourcontactors 21,22,23, CPK11contactor 21 in 24 and CPK13contactor 23 closed connections,compressor 13 in acompressor 11 in the first independent cooling loop and the second independent cooling loop carries out work, this moment, the compressor power consumption was suitable with existing air-conditioning unit, but because air-conditioning unit of the present invention has utilized the area of dissipation of all 2 condensers and 2 evaporimeters, be equivalent to increase the heat exchange area of condensation and evaporation, improved system's refrigerating efficiency, and existing air-conditioning unit has only utilized the area of 1 condenser and 2 * 0.5 evaporimeters, so refrigerating efficiency of the present invention improves greatly.

C), when recording in the car cooling load, return air temperature sensor 8 is higher than 50% and when being lower than 75%, air-conditioner controller 7 output signals, fourcontactors 21,22,23, CPK11contactor 21 in 24,CPK12 contactor 22, CPK13contactor 23 closed connections, open twocompressors 11 in the first independent cooling loop, 12 carry out work, acompressor 13 of opening in the second independent cooling loop carries out work, the compressor power consumption is lower than existing air-conditioning unit, be equivalent to 75% of existing air-conditioning unit, and refrigerating efficiency has small size raising.

D), only, return air temperature sensor 8 is higher than 75% and when being lower than 100% when recording in the car cooling load, air-conditioner controller 7 output signals,CPK11 contactor 21,CPK12 contactor 22, CPK13contactor 23, all closed connection ofCPK14 contactor 24, open all fourcompressors 11 in two independent cooling loops, 12,13,14, the present invention's this moment is the same with refrigerating efficiency with existing air-conditioning unit energy consumption.

In sum, by substituting the compressor of an existing 6.5KW behind two power compressor parallel that is 3.3KW, cooling load is less than under the 25% refrigeration demand operating mode in car, the present invention and existing air-conditioning unit all need move a compressor can satisfy the refrigeration requirement, and two kinds of compressor power consumptions differ nearly one times; In refrigeration demand greater than 25% less than 50% working condition under, refrigerating efficiency of the present invention improves a lot; In refrigeration demand greater than 50% less than 75% working condition under, the present invention moves the compressor of three 3.3KW, and existing air-conditioning unit need move the compressor of two 6.5KW, power consumption of the present invention also is lower than existing air-conditioning unit; Greater than 75% o'clock, all compressors all need move in refrigeration demand, and two kinds of air-conditioning unit power consumptions much at one.Therefore, the present invention in refrigeration demand less than having obvious energy-saving effect at 75% o'clock.

In addition, divide fourth gear to regulate according to the needs refrigerating capacity of cooling load in the car, improved the refrigerating efficiency of air-conditioning unit and/or reduced energy consumption, vehicle interior temperature compares with existing air-conditioning unit that to have uniformity better, and the passenger is more comfortable.

Claims (7)

1. railcar unitary air conditioner unit, comprise at least two independently refrigerating circuits, each refrigerating circuit comprises compressor (11), the condenser (2) that is connected with compressor (11) one ends, the evaporator coil (6) that is connected with condenser (2) one ends; This evaporator coil (6) is connected with compressor (11) other end and constitutes the closed-loop path; Described evaporator coil (6) is arranged in evaporimeter (3), and these evaporimeter (3) one sides are provided with pressure fan (4), it is characterized in that, comprise the compressor (11) of at least two parallel connections in each independent cooling loop.

2. air-conditioning unit according to claim 1 is characterized in that, a side of described condenser (2) is provided with condensation fan (5).

3. air-conditioning unit according to claim 1, it is characterized in that, the evaporator coil (6) that comprises two groups of parallel connections in described each independent cooling loop, the one group of evaporator coil (6) in this independent cooling loop places same evaporimeter (3) with the one group of evaporator coil (60) in another one or a plurality of refrigerating circuit.

4. air-conditioning unit according to claim 1 is characterized in that, the return air inlet of described air-conditioning unit is provided with the return air temperature sensor (8) of cooling load in the inspection vehicle, each compressor (11,12,13,14) the equal correspondence of a side is provided with and can makes each compressor (11,12,13,14) contactor of start and stop (21,22,23,24), described return air temperature sensor (8) and can be controlled each contactor (21,22,23,24) air-conditioner controller of folding (7).

5. the control method as railcar unitary air conditioner unit as described in one of claim 1～4 is characterized in that, at first, and cooling load amount in the inspection vehicle; Regulate respectively the start and stop platform number of compressor (11,12,13,14) in the independently refrigerating circuit then according to cooling load amount in the car that detects, make that the refrigerating circuit quantity of work is maximum.

6. control method according to claim 5, it is characterized in that, the cooling load amount is to give air-conditioner controller (7) by the return air temperature sensor (8) of the return air inlet that is arranged on the air-conditioning unit with the vehicle interior temperature transfer of data in the described inspection vehicle, and air-conditioner controller (7) is controlled each contactor (21,22 respectively according to the interior cooling load amount of car that return air temperature sensor (8) records then, 23,24) folding, thus each compressor (11,12 controlled, 13,14) start and stop.

7. control method according to claim 6 is characterized in that, described air-conditioning unit comprises two independently refrigerating circuits, comprises the compressor (11) of two parallel connections in each independent cooling loop, and its control method is:

A), when return air temperature sensor (8) records that cooling load is lower than 25% in the car, air-conditioner controller (7) output signal, four contactors (21,22,23,24) contactor in (21) is closed to be connected, and the compressor (11) in four compressors is started working.

B), when recording in the car cooling load, return air temperature sensor (8) is higher than 25% and be lower than 50%, air-conditioner controller (7) output signal, four contactors (21,22,23,24) contactor in (21) and contactor (23) are closed to be connected, and compressor (11) in the first independent cooling loop and the compressor (13) in the second independent cooling loop carry out work.

C), when recording in the car cooling load, return air temperature sensor (8) is higher than 50% and when being lower than 75%, air-conditioner controller (7) output signal, four contactors (21,22,23,24) two compressors (11 in the first independent cooling loop are opened in the contactor in (21), contactor (22), the closed connection of contactor (23), 12) carry out work, a compressor (13) of opening in the second independent cooling loop carries out work.

D), when recording in the car cooling load, return air temperature sensor (8) is higher than 75% and when being lower than 100%, air-conditioner controller (7) output signal, contactor (21), contactor (22), contactor (23), contactor (24) are all closed to be connected, open all four compressors (11 in two independent cooling loops, 12,13,14).

Images