CN2401391Y

CN2401391Y - Air conditioner for tram

Info

Publication number: CN2401391Y
Application number: CN 99233768
Authority: CN
Inventors: 李先换
Original assignee: HENGLI AIR CONDITIONING EQUIPMENT CO Ltd HENGYANG
Current assignee: HENGLI AIR CONDITIONING EQUIPMENT CO Ltd HENGYANG
Priority date: 1999-07-23
Filing date: 1999-07-23
Publication date: 2000-10-18
Anticipated expiration: 2009-07-23

Abstract

The utility model relates to an air conditioner for trams, which uses DC motor to drive a compressor. The utility model is characterized in that by-pass valves are arranged at the suction and the exhaust ends of the compressor; a suction and an exhaust stop valves are respectively connected with an NRV check valve. When the compressor is stopped, in the utility model, the NRV check valve can act to prevent high and low pressure from disturbing to lose refrigerating capacity. Simultaneously, the bypass valve is opened for unloading, which is convenient for the DC motor to unload and start to protect the compressor and extend the service life of the compressor.

Description

Trolley air conditioner

The utility model relates to a kind of trolley air conditioner with the DC motor Driven Compressor.

With the air-conditioning of DC motor Driven Compressor, solved the emissions from engines problem of environment pollution caused, but the life-span of compressor is shorter.This be because: after DC machine outage, compressor just stops, system's bypass, but bypass speed is very slow, refrigeration is very poor.Because of DC motor is stopped very short at interval, when DC motor is connected once more, system is complete equilibrium not also, and high pressure has reduced, and low pressure raises, evaporation fan remains in operation, this moment, compressor load was bigger, and the loss of refrigeration capacity of system is also bigger, and it is big to start load, refrigerating capacity all reduces, and circulates so repeatedly and causes the compressor life-span short.

The purpose of this utility model be to provide a kind of compressor service life the trolley air conditioner of long DC motor Driven Compressor.

The technical solution of the utility model is: it has compressor, DC motor, condenser, evaporator, expansion valve, shutoff valve etc., it is characterized in that: at compressor suction, exhaust side a bypass disc is set, on suction, discharge line valve, respectively connects a NRV check (non-return) valve.When the DC motor momentary power failure is compressor shutdown; inhale; the NRV check (non-return) valve of exhaust side works; high pressure in the anti-locking system and low pressure are ganged up and refrigerating capacity in the loss system; and this moment, evaporation fan turned round always; system is still in refrigeration; check (non-return) valve separates compressor and refrigeration system; this moment, the bypass disc of compressor was opened; high pressure; the rapid balance of low pressure and unloading, thus be convenient to the no-load starting of DC motor, when DC motor is connected once more; bypass disc is closed; exhaust gas pressure rises rapidly, and when exhaust gas pressure surpassed high pressure in check (non-return) valve medi-spring pressure and the system, the exhaust check (non-return) valve was just opened; air-breathing check (non-return) valve is also opened; make system enter normal working, thus the protection compressor, the service life of prolongation compressor.In addition, behind the direct current drive tester in power-down state, the evaporation fan in the refrigeration system remains in operation, and check (non-return) valve cuts off height, so still can freeze and effective.

Fig. 1 is the utility model refrigeration system principle schematic;

Fig. 2 is unit power plant bypass disc and compressor connection diagram;

Fig. 3 is that Fig. 2 A is to scheme drawing.

The utility model is described in further detail below in conjunction with accompanying drawing.

The utility model is made up of unit power plant, overhead, automatically controlled three parts, unit power plant as shown in Figure 2, form by DC motor (13), 6FY compressor (4), electrical generator (15), bypass pipe (14), bypass disc (5), exhaust check (non-return) valve (2), air-breathing check (non-return) valve (7), suction line valve (6) discharge line valve (3), DC motor, 6FY compressor, electrical generator three place on the frame by the belt connection, adopt the rubber absorbers damping.Active force is a DC motor, and the electrical network that adopts trackless trolley car to use provides power supply.Between 6FY compressor high-low pressure, bypass disc (5) is set, outside bypass disc, is provided with suction line valve (6) and discharge line valve (3) by bypass pipe (14).Between suction line valve (6) and evaporator (8), be provided with the air-breathing check (non-return) valve of NRV (7), between discharge line valve (3) and condenser (1), be provided with NRV exhaust check (non-return) valve (2).The overhead part mainly is made up of condenser (1), evaporator (8), expansion valve (9), bypass disc (10), dryer (11), liquid vessel (12).During work, the low-pressure refrigerant vapor of coming out from evaporator is inhaled into the compressor, and compressed machine is compressed into high pressure high temperature vapor, enters through discharge line valve and exhaust check (non-return) valve and is cooled to highly pressurised liquid in the condenser.Liberated heat is discharged in the atmosphere by fan during condensation, and liquid refrigerant throttling decrease temperature and pressure after liquid vessel, dryer enter expansion valve enters suction line valve, evaporator.Refrigerant absorbs the air heat of cooling and vaporizes in evaporator, cooled air is sent in the car by evaporation fan.

Claims

1, a kind of trolley air conditioner with the DC motor Driven Compressor, have compressor, DC motor, condenser, evaporator, expansion valve, shutoff valve etc., it is characterized in that: at compressor suction, exhaust side a bypass disc is set, on suction, discharge line valve, respectively connects a NRV check (non-return) valve.