CN220242924U - Multi-evaporator air conditioner applied to electric double-layer bus - Google Patents

Abstract

The utility model discloses a multi-evaporator air conditioner applied to an electric double-layer bus, which relates to the technical field of electric automobile air conditioners and comprises two groups of mutually independent units for respectively providing cold energy for upper and lower layers of the bus; and three evaporating devices respectively arranged at the left side and the right side of the upper layer of the bus and at the rear of the lower driving position of the bus, wherein the three evaporating devices are connected with the first unit, and generate cold energy at corresponding positions, so that the areas where the first unit and the second unit cannot provide cold energy can be supplemented, the cold energy obtained by each area of the double-layer bus when the air conditioner operates is more uniform, and the problems of insufficient cold energy and air quantity of a single evaporator, poor space comfort and the like are effectively solved.

Description

Multi-evaporator air conditioner applied to electric double-layer bus

Technical Field

The utility model relates to the technical field of electric automobile air conditioners, in particular to a multi-evaporator air conditioner applied to an electric double-layer bus.

Background

Public transportation is a business card of each city, and double-layer buses become pets of a plurality of cities once, so that the public transportation is not only a scheme for solving the problem of mass public transportation of cities, but also business cards of some cities. The double-deck bus is a double-deck bus, and is a bus with an upper passenger compartment and a lower passenger compartment which are connected by stairs. Early double-deck bus product technology is gradually developed from a front engine to a rear engine, diesel power is developed to fuel gas and electric power, and double-deck buses which are developed by a passenger train factory are basically of an all-electric type from the aspects of environmental protection and energy conservation in China. The upper layer of the double-layer bus has wide visual field, is suitable for sightseeing, and is provided with double-layer bus sightseeing lines in most cities in China, and the top of the upper layer is usually provided with a glass skylight in order to ensure that the lighting permeability of the upper layer is better, but the defect that the carriage of the upper layer has large heat load and poor heat preservation performance, and more cold energy is needed for keeping comfortable temperature; on the other hand, the upper layer and the lower layer of the double-layer bus are connected by using stairs, the lower layer air channel on the side of the stairs is disconnected, the air channel on the side of the middle door of the bus body is blocked by the middle door, and the air channel on the side of the middle door of the bus body can only be used for conveying the air channel on the rear side to the bus head by using a small transition air channel, so that the area from the middle part of the lower layer carriage to the bus head has less cold energy, large heat load and poor comfort. For example, patent publication No. CN212194996U proposes an air conditioning system installation structure of a pure electric double-deck bus, that is, evaporators are arranged on the upper and lower layers of the bus, so as to realize zonal constant temperature control of the upper and lower cabins. However, in this solution, the upper evaporator is located at the tail of the upper cabin, the lower evaporator is part of an integral structure, and the integral structure is placed at the tail of the vehicle body, and both of them do not consider the temperature difference problem in the front and rear areas inside the bus cabin, and the problem of higher temperature in the driving position.

Accordingly, there is a need to provide a multi-evaporator air conditioner applied to an electric double-deck bus to solve the above-mentioned problems.

Disclosure of Invention

Aiming at the problems in the related art, the utility model provides the multi-evaporator air conditioner applied to the electric double-layer bus, which increases the cold air quantity in front of the electric double-layer bus and in the driver's position area, ensures that the cold air blown out from each area of the electric double-layer bus is more uniform, and improves the comfort of the internal space of the electric double-layer bus.

The utility model is realized in the following way:

the utility model provides a be applied to multi-evaporator air conditioner of electronic double-deck bus, the bus includes upper strata and lower floor, the front of bus lower floor is equipped with the driver's seat; the air conditioner comprises a rear unit; the rear unit is arranged at the rear of the bus and consists of a first unit and a second unit; the first unit and the second unit are respectively internally provided with a compressor, a condenser, an expansion valve and an evaporator which are sequentially and circularly connected through pipelines; the evaporator positioned in the first unit is a first evaporator, and the evaporator positioned in the second unit is a second evaporator; the air outlet of the first evaporator is communicated with the upper layer of the bus, and the air outlet of the second evaporator is communicated with the lower layer of the bus; the first unit and the second unit are mutually independent and can be independently controlled;

the pipeline connected between the condenser and the expansion valve of the first unit is split to form a first high-pressure pipeline, and the tail end of the first high-pressure pipeline is a split interface; the pipeline connected between the evaporator and the compressor of the first unit is split to form a first low-pressure pipeline, and the tail end of the first low-pressure pipeline forms a converging interface;

the air conditioner further comprises a plurality of evaporation devices which are composed of expansion valves and evaporators, wherein the evaporation devices are provided with high-pressure interfaces connected with the expansion valves and low-pressure interfaces connected with the evaporators, a left front evaporation device and a right front evaporation device are respectively arranged on the left side and the right side of the front of the upper layer of the bus, and a lower front evaporation device is arranged behind the driving position; a plurality of high-pressure interfaces are respectively connected to the shunt interfaces through high-pressure hoses; the plurality of low pressure ports are connected to the confluence ports through low pressure hoses, respectively. Corresponding evaporators are arranged at a plurality of positions of the bus for getting on or off the bus, so that the cooling capacity obtained by each area of the bus when the air conditioner operates is more uniform.

As further optimization of the scheme, the air conditioner is also provided with a high-pressure four-way valve and a low-pressure four-way valve; the high-pressure four-way valve comprises a first input port and three first output ports, and the low-pressure four-way valve comprises three second input ports and a second output port;

the high-pressure ports are connected to the first output ports through the high-pressure hoses respectively, and the low-pressure ports are connected to the second input ports through the low-pressure hoses respectively; a second high-pressure pipeline is connected between the first input port and the split-flow interface, and a second low-pressure pipeline is connected between the second output port and the confluence interface; because the left front evaporation device, the right front evaporation device and the lower front evaporation device are far away from the rear unit, pipelines are inconvenient to arrange, and therefore, a longer second high-pressure pipeline and a second low-pressure pipeline are communicated with the front and the rear of a bus, and then the high-pressure four-way valve and the low-pressure four-way valve are used for respectively shunting and converging the high-pressure refrigerant and the low-pressure refrigerant.

As a further optimization of the scheme, the first evaporator is provided with two first air outlets which are respectively communicated to two sides above the rear unit; and the second evaporator is provided with two second air outlets which are respectively communicated to the left side and the right side of the rear unit.

As a further optimization of the scheme, the bus upper layer extends along the top of the inner side wall to form a U-shaped ventilation pipeline, and two tail ends of the U-shaped ventilation pipeline are respectively communicated with the two first air outlets; the cold generated by the first evaporator gradually spreads along the U-shaped ventilation duct.

As further optimization of the scheme, one side of the lower layer of the bus is provided with an upper stair and a lower stair, the front part of the other side is provided with a front door, and the middle part of the other side is provided with a middle door; the lower layer of the bus is provided with a first ventilation pipeline and a second ventilation pipeline in an extending mode along the tops of two side walls of the interior; one end of the first ventilation pipeline extends to the stair opening, and the other end of the first ventilation pipeline is communicated with one first air outlet; one end of the second ventilation pipeline extends to the front vehicle door, and the other end of the second ventilation pipeline is communicated with the other second air outlet; the cold energy generated by the second evaporator is diffused along the first ventilation pipeline and the second ventilation pipeline respectively.

As a further optimization of the scheme, a plurality of air outlet holes with uniform intervals are arranged along the inner side surfaces and/or the bottom of the U-shaped ventilating duct, the first ventilating duct and the second ventilating duct; the second ventilation pipeline is contracted at the middle vehicle door to form a transition air duct; the air outlet holes can make the cooling capacity obtained by each area of the bus as uniform as possible, and the space is squeezed and reduced due to the arrangement of the middle car door at the lower layer of the bus, so that the second ventilation pipeline is correspondingly reduced at the middle car door to form a transitional air channel.

As a further optimization of the scheme, a third air outlet is arranged on the left front evaporation device; a fourth air outlet is formed in the right front evaporation device; the third air outlet and the fourth air outlet are respectively communicated with the U-shaped ventilation pipeline; the cold energy generated by the first evaporator is diffused along the U-shaped ventilation pipeline and gradually becomes smaller when reaching the front of the upper layer of the bus, so that the left front evaporation device and the right front evaporation device can generate cold energy to be supplemented into the U-shaped ventilation pipeline, the front of the upper layer of the bus is supplemented with the cold energy, and finally the cold energy obtained in each area of the upper layer of the bus is more uniform.

As a further optimization of the scheme, a fifth air outlet is further arranged on the left front evaporation device; a sixth air outlet is formed in the right front evaporation device; the fifth air outlet extends to a front windshield of the lower layer of the bus through a pipeline; the sixth air outlet extends to the lower layer of the bus through a pipeline and is communicated with the second air passage; the second evaporator is arranged at the rear of the vehicle only, and the cooling capacity provided by the second evaporator is blocked at the stairs and is greatly reduced at the transitional air duct, so that the area in front of the lower layer of the bus cannot obtain enough cooling capacity and is called as sultry after a long time, and the lower front evaporation device is arranged behind the driving position, but the space is limited, the lower front evaporation device is smaller, and the generated cooling capacity is also smaller; therefore, when the cooling capacity supply of the upper layer of the bus is sufficient, the cooling capacity generated by the left front evaporation device and the right front evaporation device is respectively supplied to the driving position of the lower layer of the bus and the second ventilation pipeline through the pipelines, so that the cooling capacity is supplemented to the front of the lower layer of the bus.

As a further optimization of the scheme, a seventh air outlet and an eighth air outlet are arranged on the lower front evaporation device; the seventh air outlet and the eighth air outlet extend to the side face and the rear of the driving position through pipelines; the lower front evaporation device provides cold energy for a driver from multiple angles, so that the driver sitting on the driver seat is more comfortable.

As a further optimization of the scheme, a control module is arranged on the bus; a temperature sensor is arranged at the lower front evaporation device; a solenoid valve is arranged on a high-pressure hose connected with the lower front evaporation device; the temperature sensor is connected with the control module; the control module is connected with the electromagnetic valve. When the temperature on the temperature sensor reaches a set threshold value, a signal is sent to the control module, and the control module sends out a command to control the opening or closing of the electromagnetic valve.

The beneficial effects are as follows:

the multi-evaporator air conditioner provided by the utility model can ensure that the cooling capacity of each area of the double-layer bus is more uniform when the air conditioner operates, and effectively solves the problems of insufficient cooling capacity and air quantity of a single evaporator, poor space comfort and the like.

Drawings

FIG. 1 is a schematic side view of a two-layer bus according to an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of an upper layer of a two-layer bus according to an embodiment of the present utility model;

FIG. 3 is a schematic cross-sectional view of a lower layer of a two-layer bus according to an embodiment of the present utility model;

FIG. 4 is a schematic connection diagram of a rear unit and a plurality of evaporation devices according to an embodiment of the present utility model;

FIG. 5 is a partial view a of FIG. 4;

FIG. 6 is a partial view b of FIG. 4;

fig. 7 is a schematic cross-sectional view of a rear unit according to an embodiment of the present utility model.

Reference numerals:

1. a bus; 11. an upper layer; 111. u-shaped ventilation duct; 12. a lower layer; 121. stairs for going up and down; 122. a front door; 123. a middle vehicle door; 124. a first ventilation duct; 125. a second ventilation duct; 1251. a transition air duct; 13. a driving position; 2. air-conditioning; 21. a rear-mounted unit; 211. a first unit; 2111. a first evaporator; 21111. a first air outlet; 2112. a first high pressure conduit; 21121. a shunt interface; 2113. a first low pressure conduit; 21131. a bus interface; 212. a second unit; 2121. a second evaporator; 21211. a second air outlet; 22. a left front evaporator; 221. a third air outlet; 222. a fifth air outlet; 23. a right front evaporator; 231. a fourth air outlet; 232. a sixth air outlet; 24. a lower front evaporation device; 241. a seventh air outlet; 242. an eighth air outlet; 243. an electromagnetic valve; 25. a high-voltage interface; 26. a low voltage interface; 27. a high pressure four-way valve; 271. a first input port; 272. a first output port; 28. a low pressure four-way valve; 281. a second input port; 282. a second output port; 29. a high pressure hose; 2-10, a low pressure hose; 2-11, a second high-pressure pipeline; 2-12, a second low-pressure pipeline.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 7, the present embodiment discloses a multi-evaporator air conditioner 2 applied to an electric double-deck bus 1, the bus 1 includes an upper layer 11 and a lower layer 12, and a driving seat 13 is provided in front of the lower layer 12 of the bus 1; the air conditioner 2 comprises a rear unit 21; the rear unit 21 is arranged at the rear of the bus 1 and consists of a first unit 211 and a second unit 212; a compressor (not shown), a condenser (not shown), an expansion valve (not shown) and an evaporator which are sequentially and circularly connected through pipelines are respectively arranged in the first unit 211 and the second unit 212; wherein, the evaporator of the first unit 211 is a first evaporator 2111, and the evaporator of the second unit 212 is a second evaporator 2121; the air outlet of the first evaporator 2111 is communicated with the upper layer 11 of the bus 1, and the air outlet of the second evaporator 2121 is communicated with the lower layer 12 of the bus 1; the first unit 211 and the second unit 212 are independent from each other and can be controlled independently;

in this embodiment, two first air outlets 21111 are provided on the first evaporator 2111, and the two first air outlets 21111 are respectively connected to two sides above the rear unit 21; wherein, the upper layer 11 of the bus 1 extends along the top of the inner side wall to form a U-shaped ventilation duct 111, and two ends of the U-shaped ventilation duct 111 are respectively communicated with the two first air outlets 21111; the cooling capacity generated by the first evaporator 2111 gradually spreads along the U-shaped ventilation duct 111;

the second evaporator 2121 is provided with two second air outlets 21211, and the two second air outlets 21211 are respectively communicated to the left and right sides of the rear unit 21; wherein, one side of the inside of the lower layer 12 of the bus 1 is provided with an upper-lower layer stairs 121, the front part of the other side is provided with a front door 122, and the middle part is provided with a middle door 123; the lower layer 12 of the bus 1 is provided with a first ventilation pipeline 124 and a second ventilation pipeline 125 along the top of two side walls of the interior in an extending manner; one end of the first ventilation pipeline 124 extends to the stair opening, and the other end of the first ventilation pipeline is communicated with one first air outlet 21111; one end of the second air passage 125 extends to the front door 122, and the other end is communicated with the other second air outlet 21211; the cold generated by the second evaporator 2121 is diffused along the first ventilation duct 124 and the second ventilation duct 125, respectively.

In this embodiment, a plurality of air outlet holes (not shown, but the arrows in fig. 1 to 3 indicate the flow direction of the cold energy) are arranged along the inner sides and the bottoms of the U-shaped ventilation duct 111, the first ventilation duct 124, and the second ventilation duct 125; the second ventilation duct 125 is contracted at the middle door 123 to form a transition duct 1251; the air outlet holes can make the cooling capacity obtained by each area of the bus 1 as uniform as possible, and the space of the lower layer 12 of the bus 1 is occupied and reduced due to the arrangement of the middle car door 123, so that the second ventilation duct 125 correspondingly reduces at the middle car door 123 to form a transition air duct 1251.

The pipelines connected between the condenser and the expansion valve of the first unit 211 are split to form a first high-pressure pipeline 2112, and the tail end of the first high-pressure pipeline 2112 is a split interface 21121; the pipeline connected between the evaporator and the compressor of the first unit 211 is split to form a first low-pressure pipeline 2113, and the tail end of the first low-pressure pipeline 2113 forms a confluence interface 21131;

the air conditioner 2 further comprises a plurality of evaporating devices consisting of an expansion valve and an evaporator, wherein the evaporating devices are provided with a high-pressure port 25 connected with the expansion valve and a low-pressure port 26 connected with the evaporator, wherein a left front evaporating device 22 and a right front evaporating device 23 are respectively arranged on the left side and the right side in front of the upper layer 11 of the bus 1, and a lower front evaporating device 24 is arranged behind the driving position 13;

in this embodiment, the left front evaporator 22 is provided with a third air outlet 221 and a fifth air outlet 222; the right front evaporation device 23 is provided with a fourth air outlet 231 and a sixth air outlet 232; the third air outlet 221 and the fourth air outlet 231 are respectively connected to the U-shaped ventilation duct 111; the fifth air outlet 222 extends to the front windshield of the lower layer 12 of the bus 1 through a pipeline; the sixth air outlet 232 extends to the lower floor 12 of the bus 1 through a pipe and is communicated with the second air passage 125;

the cooling capacity generated by the first evaporator 2111 diffuses along the U-shaped ventilation duct 111 and gradually decreases when reaching the front of the upper layer 11 of the bus 1, so that the left front evaporator 22 and the right front evaporator 23 can generate cooling capacity to be supplemented into the U-shaped ventilation duct 111, so that the front of the upper layer 11 of the bus 1 is supplemented with cooling capacity, and finally, the cooling capacity obtained by each area of the upper layer 11 of the bus 1 is more uniform.

On the other hand, since the lower floor 12 of the bus 1 is provided with the second evaporator 2121 only at the rear of the vehicle, the cooling capacity provided by the second evaporator 2121 is blocked at the stairs and is greatly reduced at the transition duct 1251, the area in front of the lower floor 12 of the bus 1 is not sufficiently cooled, and is called as sultry after a long time, and the lower front evaporator 24 is provided behind the driving seat 13, but the lower front evaporator 24 is smaller due to the limited space, and the generated cooling capacity is also smaller; therefore, when the cooling capacity of the upper floor 11 of the bus 1 is sufficiently supplied, the cooling capacities generated by the left front evaporator 22 and the right front evaporator 23 are respectively supplied to the driving seat 13 and the second air passage 125 of the lower floor 12 of the bus 1 through the pipes to supplement the cooling capacity in front of the lower floor 12 of the bus 1.

In this embodiment, the lower front evaporation device 24 is provided with a seventh air outlet 241 and an eighth air outlet 242; the seventh air outlet 241 and the eighth air outlet 242 extend to the side and rear of the driving seat 13 through pipes; the lower front evaporator 24 provides cooling to the driver's seat 13 from multiple angles, making it more comfortable for a driver sitting on the driver's seat 13.

In the embodiment, the fifth air outlet, the sixth air outlet, the seventh air outlet and the eighth air outlet are respectively communicated by using corrugated pipes;

in this embodiment, a control module (not shown) is disposed on the bus 1; a temperature sensor (not shown) is arranged at the lower front evaporation device 24; a solenoid valve 243 is provided on the high pressure hose 29 connected to the lower front evaporator 24; the temperature sensor is connected with the control module; the control module is connected to the solenoid valve 243. When the temperature on the temperature sensor reaches a set threshold, a signal is sent to the control module, and the control module sends out a command to control the opening or closing of the electromagnetic valve 243.

A plurality of the high-pressure ports 25 are connected to the shunt ports 21121 through high-pressure hoses 29, respectively;

in this embodiment, the air conditioner 2 is further provided with a high-pressure four-way valve 27 and a low-pressure four-way valve 28; the high-pressure four-way valve 27 includes a first input port 271 and three first output ports 272, and the low-pressure four-way valve 28 includes three second input ports 281 and a second output port 282;

the high pressure ports 25 are connected to the first output port 272 via the high pressure hoses 29, respectively, and the low pressure ports 26 are connected to the second input port 281 via the low pressure hoses 2-10, respectively; a second high-pressure pipeline 2-11 is connected between the first input port 271 and the shunt interface 21121, and a second low-pressure pipeline 2-12 is connected between the second output port 282 and the confluence interface 21131; because the left front evaporation device 22, the right front evaporation device 23 and the lower front evaporation device 24 are far away from the rear unit 21, pipelines are inconvenient to arrange, so that the longer second high-pressure pipelines 2-11 and the second low-pressure pipelines 2-12 are communicated with the front and rear of the bus 1, and then the high-pressure refrigerant and the low-pressure refrigerant are respectively split and converged by the high-pressure four-way valve 27 and the low-pressure four-way valve 28. The plurality of low pressure ports 26 are connected to the confluence ports 21131 through low pressure hoses 2-10, respectively.

Corresponding evaporators are arranged at a plurality of positions of the bus 1 for getting on and off, so that the cooling capacity obtained by each area of the bus 1 when the air conditioner 2 operates can be more uniform.

The working principle is as follows:

in this embodiment, in the air conditioner 2, the refrigerant circulates in the compressor, the condenser, the expansion valve and the evaporator in order, and the evaporator generates the cooling capacity; during operation of the first unit 211, a part of the refrigerant flowing out of the condenser flows to the expansion valve of the first unit 211, and the other part of the refrigerant flows to the 3 high-pressure ports 25 on the left front evaporator 22, the right front evaporator 23 and the lower front evaporator 24 through the high-pressure four-way valve 27, and flows from the high-pressure ports 25 to the expansion valve and the evaporator in the corresponding evaporators in sequence; the refrigerants flowing out from the 3 low-pressure ports 26 on the left front evaporator 22, the right front evaporator 23 and the lower front evaporator 24 are converged by the low-pressure four-way valve 28, and then converged with the refrigerants flowing out from the first evaporator 2111 to the compressor of the first unit 211; the cold energy generated by the first unit 211 is circulated to the upper layer 11 of the bus 1 through the U-shaped ventilating duct 111; the cold energy generated by the second unit 212 is circulated to the lower floor 12 of the bus 1 through the first ventilation duct 124 and the second ventilation duct 125; the cold energy generated by the left front evaporator 22 and the right front evaporator 23 is supplied to the U-shaped ventilation duct 111 of the upper layer 11, and the front windshield position of the lower layer 12 and the second ventilation duct 125, respectively.

Variations and modifications to the above would be obvious to persons skilled in the art to which the utility model pertains from the foregoing description and teachings. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the utility model should be also included in the scope of the claims of the utility model. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. The utility model provides a be applied to multi-evaporator air conditioner of electronic double-deck bus, the bus includes upper strata and lower floor, the front of bus lower floor is equipped with the driver's seat; the method is characterized in that: the air conditioner comprises a rear unit; the rear unit is arranged at the rear of the bus and consists of a first unit and a second unit; the first unit and the second unit are respectively internally provided with a compressor, a condenser, an expansion valve and an evaporator which are sequentially and circularly connected through pipelines; the evaporator positioned in the first unit is a first evaporator, and the evaporator positioned in the second unit is a second evaporator; the air outlet of the first evaporator is communicated with the upper layer of the bus, and the air outlet of the second evaporator is communicated with the lower layer of the bus;

the pipeline connected between the condenser and the expansion valve of the first unit is split to form a first high-pressure pipeline, and the tail end of the first high-pressure pipeline is a split interface; the pipeline connected between the evaporator and the compressor of the first unit is split to form a first low-pressure pipeline, and the tail end of the first low-pressure pipeline forms a converging interface;

the air conditioner further comprises a plurality of evaporation devices which are composed of expansion valves and evaporators, wherein the evaporation devices are provided with high-pressure interfaces connected with the expansion valves and low-pressure interfaces connected with the evaporators, a left front evaporation device and a right front evaporation device are respectively arranged on the left side and the right side of the front of the upper layer of the bus, and a lower front evaporation device is arranged behind the driving position; a plurality of high-pressure interfaces are respectively connected to the shunt interfaces through high-pressure hoses; the plurality of low pressure ports are connected to the confluence ports through low pressure hoses, respectively.

2. A multi-evaporator air conditioner for electric double-deck buses according to claim 1, wherein: the air conditioner is also provided with a high-pressure four-way valve and a low-pressure four-way valve; the high-pressure four-way valve comprises a first input port and a first output port, and the low-pressure four-way valve comprises three second input ports and a second output port;

the high-pressure ports are connected to the first output ports through the high-pressure hoses respectively, and the low-pressure ports are connected to the second input ports through the low-pressure hoses respectively; and a second high-pressure pipeline is connected between the first input port and the shunt interface, and a second low-pressure pipeline is connected between the second output port and the confluence interface.

3. A multi-evaporator air conditioner for electric double-deck buses according to claim 1, wherein: the first evaporator is provided with two first air outlets which are respectively communicated to two sides above the rear unit; and the second evaporator is provided with two second air outlets which are respectively communicated to the left side and the right side of the rear unit.

4. A multi-evaporator air conditioner for electric double-deck buses according to claim 3, wherein: the bus upper layer extends along the top of the inner side wall to form a U-shaped ventilation pipeline, and two tail ends of the U-shaped ventilation pipeline are respectively communicated with the two first air outlets.

5. A multiple evaporator air conditioner for electric double-deck buses according to claim 4, wherein: one side of the lower layer of the bus is provided with an upper stair and a lower stair, the front part of the other side is provided with a front door, and the middle part of the other side is provided with a middle door; the lower layer of the bus is provided with a first ventilation pipeline and a second ventilation pipeline in an extending mode along the tops of two side walls of the interior; one end of the first ventilation pipeline extends to the stair opening, and the other end of the first ventilation pipeline is communicated with one first air outlet; one end of the second ventilating duct extends to the front door, and the other end of the second ventilating duct is communicated with the other second air outlet.

6. A multiple evaporator air conditioner for electric double-deck buses according to claim 5, wherein: a plurality of air outlet holes with uniform intervals are formed along the inner side surfaces and/or the bottom of the U-shaped ventilation pipeline, the first ventilation pipeline and the second ventilation pipeline; and the second ventilation pipeline is contracted at the middle vehicle door to form a transitional air channel.

7. A multi-evaporator air conditioner for electric double-deck buses according to claim 6, wherein: a third air outlet is formed in the left front evaporation device; a fourth air outlet is formed in the right front evaporation device; the third air outlet and the fourth air outlet are respectively communicated with the U-shaped ventilating duct.

8. A multi-evaporator air conditioner for electric double-deck buses according to claim 7, wherein: a fifth air outlet is also formed in the left front evaporation device; a sixth air outlet is formed in the right front evaporation device; the fifth air outlet extends to a front windshield of the lower layer of the bus through a pipeline; the sixth air outlet extends to the lower layer of the bus through a pipeline and is communicated with the second air passage.

9. A multi-evaporator air conditioner for electric double-deck buses according to claim 1, wherein: a seventh air outlet and an eighth air outlet are arranged on the lower front evaporation device; the seventh air outlet and the eighth air outlet extend to the side face and the rear of the driving position through pipelines.

10. A multi-evaporator air conditioner for electric double-deck buses according to claim 1, wherein: the bus is provided with a control module; a temperature sensor is arranged at the lower front evaporation device; a solenoid valve is arranged on a high-pressure hose connected with the lower front evaporation device; the temperature sensor is connected with the control module; the control module is connected with the electromagnetic valve.