CN101922818B - Air conditioning unit of rail transit train - Google Patents

Abstract

An air conditioning unit for rail transit trains, comprising a first compressor, a second compressor, a third compressor, a fourth compressor, a first condenser, a second condenser, a first evaporator and a second evaporator, each The equipment is connected through refrigerant pipelines; wherein, the first compressor and the second compressor are connected in parallel to form the first compressor unit, and the third compressor and the fourth compressor are connected in parallel to form the second compressor unit; the first compressor unit and the first condenser , the first evaporator forms the first circulation loop, and forms the second circulation loop with the first condenser and the second evaporator; the second compressor unit forms the third circulation loop with the second condenser and the first evaporator, and forms the third circulation loop with the first condenser and the second evaporator The second condenser and the second evaporator form a fourth circulation loop. Compared with the air conditioning unit of the prior art, the rail transit train air conditioning unit of the present invention has a wider energy regulation range, and can realize 4 cooling capacity output modes of 25%, 50%, 75% and 100%.

Description

Rail Transit Train Air Conditioning Units

technical field

The invention relates to a refrigeration device, in particular to an air-conditioning unit for rail transit trains.

Background technique

In the hot season, the air conditioning unit on the rail transit train can cool down and dehumidify the mixed air composed of outdoor fresh air and return air from the train compartment, and send it evenly into the compartment through the air supply duct to reduce the temperature inside the compartment. At the same time, it provides fresh air, improves the air quality in the compartment, and creates a comfortable riding environment for passengers. The load in the rail transit compartment fluctuates greatly with the flow of people (rush hour), weather (sunny, rainy), season, and operating path (elevated or tunnel). Therefore, the cooling demand for air conditioning units is also constantly changing. At present, air-conditioning units on rail transit trains generally adopt a dual-system solution with one refrigeration cycle and one compressor. From the perspective of energy regulation, only 50% of the cooling capacity can be achieved (turn off one compressor) or 100% of the cooling capacity. The two modes cannot meet the complex situation where the cooling demand in the cabin varies widely, and the high-temperature operating conditions are limited (it must be shut down if the external temperature is higher than 45°C).

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems and provide an air-conditioning unit for rail transit trains that can realize more cooling capacity output modes.

In order to achieve the above object, the present invention adopts the following technical solutions: a train air conditioning unit for rail transit, comprising a first compressor, a second compressor, a third compressor, a fourth compressor, a first condenser, a second condenser device, the first evaporator and the second evaporator, and each device is connected through a refrigerant pipeline; wherein, the first compressor and the second compressor are connected in parallel to form the first compressor unit, and the third compressor and the fourth compressor are connected in parallel to form the second compressor unit. Two compressor units; the first compressor unit forms the first circulation loop with the first condenser and the first evaporator, and forms the second circulation loop with the first condenser and the second evaporator; the second compressor unit and the second condenser , The first evaporator forms the third circulation loop, and forms the fourth circulation loop with the second condenser and the second evaporator.

The first evaporator and the second evaporator are respectively composed of two half evaporators, and each evaporator has half of the evaporator to form a circulation loop with the first compressor unit and the first condenser, and the other half of the evaporator The two inlet pipelines of the two half evaporators and the outlet pipeline of the first condenser that form the circulation loop with the first compressor unit and the first condenser Parallel connection, the two outlet pipelines are connected in parallel with the inlet pipeline of the first compressor unit; the two inlet pipelines of the two half evaporators forming a circulation loop with the second compressor unit and the second condenser are connected with the inlet pipeline of the second condenser The outlet pipelines are connected in parallel, and the two outlet pipelines are connected in parallel with the inlet pipeline of the second compressor unit.

Among the two inlet pipelines of the two half evaporators in parallel with the outlet pipeline of the first condenser, there is a first electromagnetic valve installed on the inlet pipeline; Among the two inlet pipelines of the two half evaporators connected in parallel, one of the inlet pipelines is equipped with a second solenoid valve.

Compared with the air-conditioning unit of the prior art, the air-conditioning unit of the rail transit train of the present invention has a wider range of energy regulation due to the adoption of the above technical scheme, and can realize four types of refrigeration such as 25%, 50%, 75%, and 100%. volume output mode. Moreover, it is better than the air conditioner unit in the prior art in terms of comfort adjustment (preventing cooling capacity from being too large or too small) and energy saving.

Description of drawings

Fig. 1 is a schematic structural view of the rail transit train air conditioning unit of the present invention.

Detailed ways

Referring to Fig. 1, rail transit train air conditioning unit of the present invention comprises first compressor 11, second compressor 12, third compressor 13, fourth compressor 14, first condenser 21, second condenser 22, The first evaporator 31 and the second evaporator 32 are connected to each other through refrigerant pipelines. Wherein, the first compressor 11 and the second compressor 12 are connected in parallel to form the first compressor unit, and the third compressor 13 and the fourth compressor 14 are connected in parallel to form the second compressor unit; the first compressor unit and the first condenser 21, the second An evaporator 31 constitutes the first circulation loop. The first compressor group, the first condenser 21 and the second evaporator 32 form a second circulation loop. The second compressor unit, the second condenser 22 and the first evaporator 31 form a third circulation loop. The second compressor unit, the second condenser 22 and the second evaporator 32 form a fourth circulation loop.

The first evaporator 31 in the present invention is composed of two half evaporators 311 , 312 , and the second evaporator 32 is composed of two half evaporators 321 , 322 . Wherein, half of the evaporator 311 of the first evaporator 31 forms a first circulation loop with the first compressor unit and the first condenser 21 . The other half of the evaporator 312 of the first evaporator 31 forms a second circulation loop with the second compressor group and the second condenser 22 . Half of the evaporator 321 in the second evaporator 32 forms a third circulation loop with the first compressor unit and the first condenser 21 . The other half of the evaporator 322 in the second evaporator 32 forms a fourth circulation loop with the second compressor unit and the second condenser 22 . The inlet pipelines 51 and 52 of the two half evaporators 311 and 321 forming the first and second circulation circuits with the first compressor unit and the first condenser 21 are connected in parallel with the outlet pipeline 53 of the first condenser 21 , the outlet pipelines 54, 55 are connected in parallel with the inlet pipeline 56 of the first compressor unit. The inlet pipelines 61 and 62 of the two half evaporators 312 and 322 forming the third and fourth circulation circuits with the second compressor group and the second condenser 22 are connected in parallel with the outlet pipeline 63 of the second condenser 22 , The outlet pipelines 64, 65 are connected in parallel with the inlet pipeline 66 of the second compressor group.

Among the inlet pipelines 51, 52 of the two half evaporators connected in parallel with the outlet pipeline 53 of the first condenser 21, there is a first solenoid valve 41 installed on an inlet pipeline (51 in this embodiment); Among the inlet pipelines 61 and 62 of the two half evaporators connected in parallel with the outlet pipeline 63 of the second condenser 22, there is an inlet pipeline (62 in this embodiment) on which the second solenoid valve 42 is installed.

As shown in the figure, 71,72 are dry filters, 81,82 are sight glasses, 91,92,93,94 are throttling expansion valves, and 101,102 are electromagnetic valves. The main functions of 101 and 102 are to close 101 and 102 after the compressor is stopped, so as to cut off the liquid refrigerant stored in the condenser and continue to flow to the evaporator, so as to prevent liquid shock when the compressor is started next time and protect the compressor.

It can be seen from the above that the rail transit train air-conditioning unit of the present invention can form four refrigeration modes and has an unloading function by controlling the start-up of the compressor and the switching of the two solenoid valves. For example, when the two compressor units are both working and the two electromagnetic valves are both open, the four circulation loops are all working, and the air-conditioning unit exerts 100% cooling efficiency. When both compressor units work and close a solenoid valve (for example, close the solenoid valve 41), one circulation loop (such as the first circulation loop) is closed, and the other three circulation loops work, and the air conditioning unit exerts 75% of its capacity. cooling efficiency. When the two compressor units are both working and the two electromagnetic valves are closed, two circulation loops are closed, the other two circulation loops are working, and the air conditioning unit exerts 50% cooling efficiency. Or when one compressor unit is working and the other compressor unit is off, the solenoid valve related to the working compressor unit is opened, the two circulation loops are closed, the other two circulation loops are working, and the air conditioning unit also exerts 50% cooling efficiency . When one compressor unit is working and the other compressor unit is closed, if the electromagnetic valve related to the working compressor unit is also closed, only one circulation loop will work, and the air conditioning unit can only exert 25% of the refrigeration efficiency.

When the rail transit train air-conditioning unit of the present invention is working at partial load, only one of the two compressors in each group of compressor units will work, and this working compressor is equivalent to working on the heat exchange area of the condenser and evaporator In the state of doubling, the cooling efficiency will be greatly improved. In an extremely high temperature environment (when the external temperature is higher than 45°C and lower than 52°C), the air conditioning unit can take measures to keep only one compressor for every two parallel compressors, and cut off half of the evaporator of the cycle, so that the cooling The high pressure of the system drops to a certain level, so that the cooling operation of the air conditioning unit can be maintained until it exceeds 52°C. This unloading function in a high-temperature environment can further expand the external temperature range of the air-conditioning cooling operation.

Claims (3)

1. A rail transit train air conditioning unit, characterized in that: comprise a first compressor, a second compressor, a third compressor, a fourth compressor, a first condenser, a second condenser, a first evaporator and In the second evaporator, each device is connected through a refrigerant pipeline; wherein, the first compressor and the second compressor are connected in parallel to form the first compressor unit, and the third compressor and the fourth compressor are connected in parallel to form the second compressor unit; the first compressor The unit forms the first circulation loop with the first condenser and the first evaporator, and forms the second circulation loop with the first condenser and the second evaporator; the second compressor unit forms the second circulation loop with the second condenser and the first evaporator Three circulation loops, and form the fourth circulation loop with the second condenser and the second evaporator. 2. The rail transit train air-conditioning unit as claimed in claim 1, characterized in that: the first evaporator and the second evaporator are respectively composed of two and a half evaporators, and each evaporator has half an evaporator The evaporator forms a circulation loop with the first compressor unit and the first condenser, and the other half of the evaporator forms a circulation loop with the second compressor unit and the second condenser; the two evaporators form a circulation loop with the first compressor unit and the first condenser. The two inlet pipelines of the half evaporator are connected in parallel with the outlet pipeline of the first condenser, and the two outlet pipelines are connected in parallel with the inlet pipeline of the first compressor unit; they form a circulation loop with the second compressor unit and the second condenser The two inlet pipelines of the two half evaporators are connected in parallel with the outlet pipelines of the second condenser, and the two outlet pipelines are connected in parallel with the inlet pipelines of the second compressor unit. 3. The rail transit train air-conditioning unit as claimed in claim 2, characterized in that: in the two inlet pipelines of the two half evaporators in parallel with the outlet pipeline of the first condenser, there is one A first electromagnetic valve is installed on the inlet pipeline; among the two inlet pipelines of the two half evaporators connected in parallel with the outlet pipeline of the second condenser, a second electromagnetic valve is installed on one inlet pipeline .

Images