CN112776556B - Vehicle fixed-displacement single-compressor double-area air conditioning system and liquid impact prevention method thereof - Google Patents
Vehicle fixed-displacement single-compressor double-area air conditioning system and liquid impact prevention method thereof Download PDFInfo
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- CN112776556B CN112776556B CN201911096246.2A CN201911096246A CN112776556B CN 112776556 B CN112776556 B CN 112776556B CN 201911096246 A CN201911096246 A CN 201911096246A CN 112776556 B CN112776556 B CN 112776556B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
- B60H1/00807—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models the input being a specific way of measuring or calculating an air or coolant temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
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Abstract
The invention relates to a vehicle fixed-displacement single-compressor double-area air conditioning system and a liquid impact prevention method thereof. The vehicle fixed displacement single compressor double-area air conditioning system comprises a fixed displacement single compressor, a first evaporator and a second evaporator which are arranged in parallel; the first evaporator is correspondingly provided with a first temperature sensor, the first evaporator is connected with a switching valve in series, and the switching valve is correspondingly provided with a switching valve state detection module; the air conditioner control module is in signal connection with the first temperature sensor and the switching valve state detection module and is in control connection with the switching valve and the fixed displacement single compressor. The liquid impact preventing method comprises the steps of detecting the temperature of an evaporation core body of a first evaporator and the opening and closing state of a switching valve connected with the first evaporator in series, and starting a compressor when the temperature of the evaporation core body of the first evaporator is higher than a set value or the temperature of the evaporation core body of the first evaporator is lower than the set value and the switching valve is in a closed state. The scheme can avoid the phenomenon of liquid impact when the single compressor with fixed displacement is adopted.
Description
Technical Field
The invention relates to a vehicle fixed-displacement single-compressor double-area air conditioning system and a liquid impact prevention method thereof.
Background
In an air conditioner for a vehicle, a plurality of evaporators are generally required to be arranged to meet the cooling requirements of different areas of the whole vehicle. For example, it is often desirable for a bus to have a front evaporator in the driving area and a rear evaporator in the passenger area. Because the refrigeration demands corresponding to different evaporators are different, the displacement demands of different evaporators on the compressor are also different. In order to ensure that the evaporators of the air conditioners in each area work normally, the air conditioning system is generally matched with a variable displacement compressor to provide different amounts of refrigerant according to different evaporator requirements, or a plurality of evaporators are respectively and independently matched with a fixed displacement compressor. However, this solution may result in increased costs due to the provision of a variable displacement compressor or more compressors.
If a fixed displacement single compressor is adopted, namely only one fixed displacement compressor is adopted, and the refrigerant is provided for evaporators in different areas, the cost of the air conditioning system can be effectively reduced. However, this type of air conditioning system has the following problems: for a region with low refrigeration requirement, the refrigerant in the evaporator of the region is easy to have incomplete evaporation, so that the evaporator is frosted, and part of the refrigerant in a liquid state is easy to have liquid impact after reaching the compressor, so that the mechanical damage of an air conditioning system can be caused, and a great quality risk is caused.
Disclosure of Invention
The invention aims to provide a vehicle fixed-displacement single-compressor double-area air conditioning system which can avoid the phenomenon of liquid impact when a fixed-displacement single compressor is adopted; meanwhile, the invention also aims to provide a liquid impact prevention method for a vehicle fixed-displacement single-compressor double-area air conditioning system, which solves the problem that when a fixed-displacement single compressor is adopted, a liquid impact phenomenon occurs, mechanical damage of the air conditioning system is possibly caused, and further, a great quality risk is caused.
The technical scheme adopted by the vehicle fixed-displacement single-compressor double-area air conditioning system is as follows.
The vehicle fixed displacement single compressor double-area air conditioning system comprises a compressor, a condenser and an evaporator;
the compressor is a fixed displacement single compressor;
the evaporator comprises a first evaporator and a second evaporator, and the first evaporator and the second evaporator are arranged in parallel; the first evaporator and the second evaporator are respectively used for corresponding to a first area and a second area on the vehicle;
the vehicle fixed-displacement single-compressor double-area air conditioning system also comprises a first temperature sensor, a switching valve and an air conditioning control module;
the first temperature sensor is arranged corresponding to the first evaporator and used for detecting the temperature of an evaporation core body of the first evaporator;
the switching valve is connected with the first evaporator in series and used for enabling the refrigerant to simultaneously pass through the first evaporator and the second evaporator when the switching valve is opened and enabling the refrigerant to only pass through the second evaporator when the switching valve is closed;
the switching valve is correspondingly provided with a switching valve state detection module for detecting the opening and closing state of the switching valve;
and the air conditioner control module is in signal connection with the first temperature sensor and the switching valve state detection module, and is in control connection with the switching valve and the fixed displacement single compressor.
Has the advantages that: the first temperature sensor can detect the temperature of the evaporation core body in the first evaporator, the switching valve state detection module can detect the opening and closing state of the switching valve, when the air conditioning system is started, whether the temperature of the evaporation core body in the first evaporator is lower than a set value or not can be detected, the detection result is used as one of starting conditions of the compressor, and if the temperature of the evaporation core body in the first evaporator is lower than the set value, the compressor is not started; meanwhile, in order to meet the refrigeration requirement of the second evaporator, the state of the switching valve is detected through the switching valve state detection module, if the temperature of the evaporation core body in the first evaporator is lower than a set value, but the switching valve is in a closed state, it is stated that the compressor is started to avoid frosting of the first evaporator and liquid impact, and therefore the compressor can be started to meet the refrigeration requirement of the second evaporator, so that the problem that liquid impact occurs when a fixed-displacement single compressor is adopted, mechanical damage of an air conditioning system is possibly caused, and further serious quality risk is caused is solved.
As a preferable technical solution, a first regenerator is provided between the inlet side main pipeline and the outlet side main pipeline of the first and second evaporators, and/or a second regenerator is provided between the inlet side pipeline and the outlet side pipeline of the second evaporator.
Has the beneficial effects that: the first heat regenerator is arranged, so that the high-temperature and high-pressure liquid refrigerant corresponding to the first evaporator and/or the second evaporator can be cooled, and the refrigerating capacity of the air conditioner is enhanced; the low-temperature gas refrigerant can be heated, so that the liquid refrigerant possibly mixed in the low-temperature gas refrigerant can obtain heat energy and be vaporized, the refrigerant returned to the compressor is ensured to be in a gas state, and the liquid impact hazard is further prevented. The second heat regenerator is arranged to cool the high-temperature and high-pressure liquid refrigerant corresponding to the second evaporator, so that the refrigerating capacity of the air conditioner is enhanced; and the low-temperature gaseous refrigerant can be heated, so that the liquid refrigerant possibly mixed in the low-temperature gaseous refrigerant can obtain heat energy and be vaporized, the refrigerant returned to the compressor is ensured to be in a gas state, and the liquid impact hazard is further prevented.
As a preferred technical solution, the refrigeration requirement of the first evaporator is smaller than the refrigeration requirement of the second evaporator.
Has the advantages that: the first evaporator with the smaller refrigeration requirement is easier to generate liquid impact and frosting, and the switching valve corresponds to the first evaporator with the smaller refrigeration requirement and can better protect the first evaporator.
As a preferable technical solution, the refrigerant pipeline of the air conditioning system includes an in-vehicle pipeline portion arranged inside the vehicle body, and an insulating layer is arranged outside the in-vehicle pipeline portion.
Has the advantages that: the outside of the in-vehicle pipeline part is provided with the heat-insulating layer, so that the high-temperature and high-pressure pipe can be prevented from radiating into the vehicle; in the case of a low-temperature low-pressure pipe, the generation of condensation and dripping can be prevented.
As a preferable technical solution, the refrigerant pipeline of the air conditioning system includes an external pipeline portion disposed outside the vehicle body, and the external pipeline portion is not provided with an insulating layer to exchange heat with the outside.
Has the advantages that: the high-temperature high-pressure pipe exchanges heat with the outside at the outer side of the vehicle body, so that heat dissipation is facilitated, and the refrigeration performance can be further improved; the low-temperature low-pressure pipe exchanges heat with the outside to be beneficial to evaporation, and the liquid impact hidden danger can be further prevented.
The invention discloses a liquid impact prevention method of a vehicle constant-displacement single-compressor double-area air conditioning system.
The liquid impact preventing method for fixed displacement single compressor double area air conditioning system for vehicle includes the following steps:
the method comprises the following steps of firstly, detecting the temperature of an evaporation core body of a first evaporator in a first evaporator and a second evaporator which are arranged in parallel, and the opening and closing state of a switching valve connected with the first evaporator in series;
step two, judging whether the following conditions are satisfied: condition a: the temperature of the evaporation core of the first evaporator is higher than a set value; condition b: the temperature of an evaporation core body of the first evaporator is lower than a set value, and the switching valve is in a closed state;
and step three, starting the compressor under the condition that the condition a or the condition b is met, otherwise, keeping the compressor not working.
Has the advantages that: because the refrigeration demand of the first evaporator is smaller than that of the second evaporator, when the air conditioning system is started, the detection result is used as one of starting conditions of the compressor, if the detection result is lower than a set value, the compressor is not started, meanwhile, in order to meet the refrigeration demand of the second evaporator, the state of the switching valve is detected through the switching valve state detection module, if the temperature of an evaporation core body in the first evaporator is lower than the set value, but the switching valve is in a closed state, the situation that the first evaporator is frosted and liquid impact cannot be caused when the compressor is started is indicated, the compressor can be started, the refrigeration demand of the second evaporator is met, and therefore the problems that the evaporation core body of the first evaporator is frosted and the refrigerant is not completely gasified when the temperature of the evaporation core body of the first evaporator is low are avoided, the liquid impact phenomenon occurs when a single compressor with a fixed displacement is adopted, the mechanical damage of the air conditioning system can be caused, and the serious quality risk is caused are solved.
As a preferable mode, when the condition a is not satisfied, the switching valve is controlled to be in a closed state, the condition b is satisfied, and the compressor is turned on.
Has the advantages that: can better meet the refrigeration requirement in the vehicle.
As a preferable technical solution, when only the first evaporator has a cooling demand, the first and second evaporation fans corresponding to the first and second evaporators are operated at the same time.
Has the advantages that: can be under the circumstances of guaranteeing first evaporimeter refrigeration demand, the operation through second evaporation fan minimizes the evaporation core of second evaporimeter frosting, refrigerant gasification is incomplete, avoids the liquid to hit the problem better.
As a preferable technical solution, the rotation speed of the second evaporation fan is restricted to be lower than the set value to eliminate or reduce the feeling of coldness of the occupant in the second area.
Has the advantages that: this scheme can be when avoiding the liquid to hit the problem, promotes customer's impression better.
As a preferred technical solution, the refrigeration requirement of the first evaporator is smaller than the refrigeration requirement of the second evaporator.
Has the advantages that: the first evaporator that the refrigeration demand is less takes place liquid and hits and frosting more easily, and the diverter valve corresponds with the less first evaporator of refrigeration demand, can protect first evaporator better.
As a preferable technical scheme, the refrigerant pipeline of the air conditioning system comprises an in-vehicle pipeline part arranged inside a vehicle body, and an insulating layer is arranged outside the in-vehicle pipeline part; and/or the refrigerant pipeline of the air conditioning system comprises an external pipeline part arranged outside the vehicle body, and the external pipeline part is not provided with an insulating layer so that the external pipeline part exchanges heat with the outside.
Has the advantages that: the outside of the pipeline part in the vehicle is provided with the heat-insulating layer, so that the high-temperature high-pressure pipe can be prevented from radiating into the vehicle, and the low-temperature low-pressure pipe can be prevented from generating condensation and water dripping; and high temperature high-pressure pipe carries out the heat exchange with the external world in the automobile body outside and is favorable to the heat dissipation, can further promote refrigeration performance, and low temperature low-pressure pipe carries out the heat exchange with the external world and is favorable to evaporating, can further prevent liquid and hit hidden danger.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a fixed displacement single compressor dual zone air conditioning system for a vehicle according to the present invention wherein both the first evaporator and the second evaporator are refrigerated;
FIG. 2 is a schematic diagram of an embodiment of the present invention of a fixed displacement single compressor dual zone air conditioning system for a vehicle wherein only the second evaporator is refrigerating;
fig. 3 is a schematic diagram of the system piping connections of an embodiment of the constant displacement single compressor dual zone air conditioning system for a vehicle according to the present invention.
The names of the components corresponding to the corresponding reference numerals in the drawings are: 1-compressor assembly, 2-condenser assembly, 3-first evaporator assembly, 4-second evaporator assembly and 5-air conditioner controller.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
One embodiment of a vehicle fixed displacement single compressor dual zone air conditioning system of the present invention is shown in fig. 1 and includes a compressor assembly 1, a condenser assembly 2, an evaporator assembly, a regenerator, and an air conditioning controller 5.
The compressor assembly 1 comprises a compressor and a compressor clutch, wherein the compressor is a fixed-displacement single compressor, is installed on an engine and is driven by an engine belt through the compressor clutch. The outlet of the air conditioner compressor is connected with a high-pressure switch, and the inlet of the air conditioner compressor is connected with a low-pressure switch. The condenser assembly 2 is communicated with the outlet of the compressor and comprises a condensing fan system.
The evaporator assembly comprises a first evaporator assembly 3 and a second evaporator assembly 4, the first evaporator assembly 3 comprises a first evaporator and a first evaporation fan, the second evaporator assembly 4 comprises a second evaporator and a second evaporation fan, and evaporation cores of the first evaporator and the second evaporator are respectively and correspondingly provided with a first temperature sensor and a second temperature sensor. The first evaporator and the second evaporator are respectively used for corresponding to a first area and a second area on the vehicle, in the embodiment, the first area is a driving area, the second area is a passenger area, and accordingly the refrigeration demand of the first evaporator is smaller than that of the second evaporator. The first evaporator and the second evaporator are arranged in parallel, the first evaporator is connected with an electromagnetic valve in series to serve as a switching valve, and the switching valve is used for enabling refrigerant to simultaneously pass through the first evaporator and the second evaporator when the first evaporator is opened and enabling the refrigerant to only pass through the inlet side main pipeline and the outlet side main pipeline of the second evaporator when the second evaporator is closed. The switching valve is correspondingly provided with a switching valve state detection module for detecting the opening and closing state of the switching valve, and for the electromagnetic valve, a contactor with an auxiliary contact point can be adopted to control the action of the electromagnetic valve, and the auxiliary contact point forms the switching valve state detection module.
As shown in fig. 3, the refrigerant pipe of the air conditioning system includes an inside pipe portion disposed inside the vehicle body and an outside pipe portion disposed outside the vehicle body. The refrigerant pipeline can be divided into a high-pressure pipe and a low-pressure pipe according to the working pressure, the high-pressure pipe comprises a pipeline section from the outlet connecting pipe of the compressor to the pipe section of the condenser, the outlet of the condenser to the inlet connecting pipe of the expansion valve, the low-pressure pipe comprises a pipeline section from the outlet connecting pipe of the expansion valve to the inlet connecting pipe of the evaporator, and the outlet of the evaporator to the inlet of the compressor. Both the high and low pressure pipes may be located wholly or partially within the vehicle, and certainly may be located wholly or partially outside the vehicle. The outside of the pipeline part in the vehicle is provided with the heat-insulating layer, so that the high-temperature high-pressure pipe can be prevented from radiating into the vehicle; in the case of low-pressure pipes at low temperatures, the formation of condensation and dripping can be prevented. The outer pipeline part of the vehicle is not provided with a heat insulation layer for exchanging heat with the outside, and the high-temperature high-pressure pipe exchanges heat with the outside at the outer side of the vehicle body, so that heat dissipation is facilitated, and the refrigerating performance is improved; low temperature low-voltage tube and external heat exchange are favorable to evaporating, prevent liquid and hit hidden danger.
A first heat regenerator is arranged between the inlet side main pipeline and the outlet side main pipeline of the first evaporator and the second evaporator, and a second heat regenerator is arranged between the inlet side pipeline and the outlet side pipeline of the second evaporator.
The air conditioner controller is connected with an air conditioner operation panel, a first area temperature sensor, a second area temperature sensor, an illumination intensity sensor and an external environment temperature sensor, and is in control connection with the fresh air system. Of course, for those skilled in the art, the above "all connected to the air conditioner controller" may be signal connection or control connection, and those skilled in the art can determine what connection method is specific according to different connection objects.
The function and operation of the constant displacement single compressor dual zone air conditioning system for a vehicle will now be described. For convenience of description and understanding, the following text of this patent numbers each function, operation instruction, and effect after function action in order. Naming and numbering examples: function (1), instruction (1), effect (1).
1.1, the air supply (also called blowing and air outlet) function (1)
And after receiving the operation signal of the function (1), the air conditioner controller sends a first evaporation fan starting work instruction (1)), and the first evaporation fan starts to work to supply air to the interior of the vehicle. Meanwhile, the air supply volume is adjusted according to the change of the air speed instruction.
1.2, second area air supply (also called blowing, air-out) function (2)
And after receiving the operation signal of the function (2), the air conditioner controller sends a second evaporation fan starting work instruction (2)), and the second evaporation fan starts to work to supply air to the interior of the vehicle. Meanwhile, the air supply volume is adjusted according to the change of the air speed instruction.
1.3 Simultaneous air supply (also called dual temperature zone air supply) function (3) of the first zone and the second zone
And after receiving the operation signal of the function (3), the air conditioner controller sends a first evaporation fan and a second evaporation fan starting work instruction (3)), and the first evaporation fan and the second evaporation fan start to work at the same time to supply air to the interior of the vehicle. Meanwhile, the air supply volume is adjusted according to the change of the air speed instruction.
2.1 Simultaneous refrigeration (also called double-temperature-zone refrigeration, whole-vehicle refrigeration) function (4) of the first area and the second area
And when the operation signal of the function (4) is received, the air conditioner controller sends an instruction (3) to start the function (3). The following information analysis and judgment are performed, and the judgment method may be serial (serial interchangeable order) or parallel.
And the air conditioner controller analyzes the high-pressure signal and judges whether the high-pressure of the air conditioning system is normal or not. Outputting fault information if the high pressure is abnormal; the high pressure is normally one of the conditions for starting the compressor command (4), i.e. compressor work command).
And the air conditioner controller analyzes the low-pressure signal and judges whether the low-pressure of the air conditioning system is normal or not. Outputting fault information if the low pressure is abnormal; the low pressure is normally one of the conditions of the start compressor command (4)).
The air conditioner controller judges the ambient temperature outside the vehicle, and when the ambient temperature outside the vehicle does not reach the starting condition, the compressor clutch actuation command is not output (command (4)). The ambient temperature outside the vehicle reaches the starting condition, and is one of the conditions of the starting compressor instruction (4)).
And analyzing the second evaporation core temperature signal, judging the second evaporation core temperature, and not outputting a compressor clutch actuation instruction (4)) when the second evaporation core temperature signal does not reach the starting condition. The second evaporative core temperature reaches a startup condition, which is one of the startup compressor command (4)) conditions. The start-up condition here means that the evaporating core temperature of the second evaporator is higher than a set value.
And analyzing the first evaporation core temperature signal, judging the first evaporation core temperature, and sending a switching valve closing instruction (5)) when the first evaporation core temperature signal does not reach the starting condition. When the first evaporation core temperature reaches the starting condition, or the first evaporation core temperature does not reach the starting condition but the switching valve is in a closed state, the condition is one of the conditions of starting the compressor instruction (4)). The starting condition here means that the evaporating core temperature of the first evaporator is higher than a set value.
When the temperature of the first evaporation core body reaches the starting condition or the temperature of the first evaporation core body does not reach the starting condition but the closing state of the switching valve is taken as one of the conditions of a command (4)) for starting the compressor, and the temperature reduction requirement exists in the vehicle, but the first area does not meet the starting condition and the compressor cannot be started, the switching valve can be closed, the refrigerant passage of the first area is cut off, and the normal refrigeration work of the second area is ensured. At this time, the refrigerant does not pass through the first region, so that the first evaporation core body cannot be continuously frosted, and the liquid impact hidden danger cannot be caused.
When all the conditions are met, starting a condensing fan command (6) by the air conditioner controller; the condensing fan starts to operate.
And then, an instruction (4) is sent out again, the compressor is started (namely the clutch of the compressor is closed), the compressor starts to work, and high-temperature and high-pressure gas is output and enters the condenser assembly. In the condenser assembly, the high-temperature high-pressure gas is condensed into high-temperature high-pressure liquid, and the high-temperature high-pressure liquid refrigerant flows into the first heat regenerator after coming out of the condenser assembly.
When the heat regenerator initially works, the refrigerant is in a normal-temperature high-pressure state, the temperature of the working medium entering and exiting the heat regenerator is normal temperature, no temperature difference exists, and the first heat regenerator does not work. After the refrigerant exits the evaporator, the first recuperator is operated. In the first heat regenerator, the high-temperature high-pressure liquid refrigerant flow exchanges heat with the low-temperature low-pressure gaseous refrigerant, the high-temperature high-pressure liquid refrigerant is cooled, and the refrigerating capacity of the air conditioner is enhanced; the low-temperature low-pressure gaseous refrigerant is heated, so that the liquid refrigerant possibly mixed in the low-temperature low-pressure gaseous refrigerant can obtain heat energy and be vaporized, the refrigerant returning to the compressor is better ensured to be in a gas state, and the liquid impact hazard is prevented.
Of course, as will be understood by those skilled in the art for air conditioning systems, the term "high pressure" of the refrigerant is a relative term, and in the initial operating state, the high pressure of the refrigerant is typically 5 to 8 times higher than the atmospheric pressure, and after the refrigerant exits from the evaporator, the high pressure of the refrigerant is typically more than 10 times higher than the atmospheric pressure. Although "high pressure" is used for both "normal temperature and high pressure" described for the refrigerant in the initial operating state and "high temperature and high pressure" described for the refrigerant after exiting the evaporator, those skilled in the art should know what is represented by "high pressure" everywhere. The state of the art when the refrigerant is initially operated is sometimes referred to as "low temperature and low pressure" which is a relative concept with respect to "high temperature and high pressure" after being compressed by the compressor.
After the high-temperature and high-pressure liquid refrigerant comes out of the first heat regenerator, when the switching valve is opened, the high-temperature and high-pressure liquid refrigerant is divided into two paths, and the two paths of liquid refrigerant respectively enter the switching valve and then enter the first evaporator assembly and the second heat regenerator; when the switching valve is closed, only the second regenerator is flowed.
When the switching valve is opened: as shown in fig. 1, one of the refrigerants flows into the first evaporator assembly. In the first evaporator assembly, the refrigerant is changed into low-temperature and low-pressure liquid through the expansion valve, then the first evaporator core body exchanges heat, evaporation and heat absorption are carried out, air flow passing through the surface of the evaporator core body is cooled (cold air enters an environment in a vehicle along with an evaporation fan to cool the interior of the vehicle), and the refrigerant evaporates from a liquid state to a vapor state and then flows out of the evaporator to flow to the first heat regenerator. And the other path of refrigerant flows into a second heat regenerator, and the working principle of the second heat regenerator is the same as that of the first heat regenerator. In the second regenerator, the refrigerant to be flowed into the second evaporator assembly is cooled again, while the low-temperature and low-pressure gaseous refrigerant flowed out of the second evaporator assembly is heated. And after flowing out of the second heat regenerator, the refrigerant flows into the second evaporator assembly, and the second area is cooled in the second evaporator assembly, and the working principle of the second evaporator assembly is the same as that of the first evaporator assembly. And the refrigerant flows out of the second evaporator assembly, is mixed with the first path of refrigerant and then flows into the first heat regenerator.
When the switching valve is closed: as shown in fig. 2, the refrigerant flows only into the second regenerator, through the second evaporator assembly, and into the first regenerator, in a manner similar to the above-described switching valve opening. After flowing out of the first heat regenerator, the low-temperature low-pressure refrigerant gas returns to the compressor, and one working cycle of the refrigerant is completed.
When the switching valve is opened, the heat regenerator is arranged to improve the cooling effect of the second area. When the switching valve is closed, the heat regenerator is arranged to eliminate the liquid impact hidden danger. The reason is as follows: the displacement of the fixed displacement compressor is only changed along with the change of the engine speed, namely, the refrigerant mass flow cannot be changed due to the fact that the first area does not work (the switching valve is closed); in fact, the large compressor is matched with the small evaporator, when the evaporation fan operates at low wind speed, the surface of the evaporator can be frosted quickly, so that the air conditioner stops working, and meanwhile, the liquid impact hidden trouble can be generated. The second heat regenerator is adopted to heat the low-temperature and low-pressure gaseous refrigerant flowing out of the second evaporator assembly, the temperature of the gas returning to the compressor can be raised, and the liquid impact hidden danger is eliminated.
The implementation method of the above function is also the first embodiment of the liquid impact prevention method of the fixed displacement single-compressor double-area air conditioning system for the vehicle.
2.2 first zone refrigeration function (5)
And when the operation signal of the function (5) is received, the air conditioner controller sends out an instruction (3) to start the function (3). When the function (3) is operated, the upper limit value of the second zone blowing speed, that is, the upper limit value of the rotation speed of the second evaporation fan is limited, and the upper limit value is set to a value which can not be subjectively felt by blowing on the head of the passenger, and can be set appropriately according to experimental conditions. The first area is refrigerated, and meanwhile, the second area is started to supply air, so that frosting of the evaporator of the second area is prevented, and liquid impact hidden danger is prevented. The second area does not need to be refrigerated, and the comfort of passengers can be influenced by starting a refrigeration function, so that the air supply of the second area is started under the condition that the large ambient temperature meets the comfort condition, the liquid impact hidden danger is prevented, the air supply speed is limited, the passengers can not objectively feel air blowing, the anti-frosting hidden danger is met, and discomfort caused by ventilation of the passenger area is prevented.
And then, starting the function (3), simultaneously supplying air to the first area and the second area, and analyzing and judging information, wherein the judgment principle and the judgment method are the same as those in the information analysis and judgment in 2.1. And after the information analysis and judgment in the step 2.1 is passed, starting a condensing fan and a compressor, and operating the refrigeration and cooling system according to the condition when the switching valve in the step 2.1 is opened.
The implementation method of the above function is also the second embodiment of the liquid impact prevention method of the vehicle fixed displacement single compressor double-area air conditioning system.
2.3 second zone refrigeration function (6)
When receiving the operation signal of the function (6), the air conditioner firstly enters the function (2) mode to work and closes the switching valve, and the closing of the switching valve can be set before or after the function (2) mode is worked.
And (3) under the function (2) mode, information analysis and judgment are carried out, and the judgment principle and the judgment method are the same as those in the information analysis and judgment in 2.1. And after the judgment is feasible, starting the condensing fan and the compressor, and operating the refrigeration cooling system according to the condition that the switching valve in the step 2.1 is closed.
The implementation method of the above function is also the third embodiment of the liquid impact prevention method of the vehicle fixed displacement single-compressor double-area air conditioning system.
3.1 defogging function (7)
After the defogging function key is started, the corresponding defogging air system blows to the windshield and the defogging area required by the side window glass. Air conditioning refrigeration is used for dehumidifying air, and demisting is carried out on the whole load. The operation of the air conditioning and refrigerating unit is as same as 2.2.
The implementation method of the above functions is also the fourth embodiment of the liquid impact prevention method of the fixed displacement single-compressor double-area air conditioning system for the vehicle.
3.2 dehumidification function (8)
When the dehumidification function (8) is started, the air conditioner enters a working mode of refrigerating the first area and the second area at the same time at 2.1, and under the working mode, the wind speeds of the first area and the second area are limited; the speed limiting method is the same as the wind speed limiting method of the second area in 2.2.
The implementation method of the above functions is also the fifth embodiment of the liquid impact prevention method of the fixed displacement single-compressor double-area air conditioning system for the vehicle. In other embodiments of the liquid impact prevention method for the vehicle fixed-displacement single-compressor two-zone air conditioning system, when the temperature of the evaporation core of the first evaporator is lower than the set value and the switching valve is controlled to be in the open state, the compressor can also be controlled to be kept closed, and the compressor is started after the temperature of the evaporation core of the first evaporator is higher than the set value.
In the above embodiments, a first regenerator is disposed between the inlet side main pipeline and the outlet side main pipeline of the first evaporator and the second evaporator, and a second regenerator is disposed between the inlet side pipeline and the outlet side pipeline of the second evaporator.
In the above embodiment, the refrigeration demand of the first evaporator corresponding to the first area is less than the refrigeration demand of the second evaporator corresponding to the second area, in other embodiments, the refrigeration demand of the first evaporator corresponding to the first area may also be equal to or greater than the refrigeration demand of the second evaporator corresponding to the second area, and the vehicle fixed displacement single compressor dual-zone air conditioning system and the liquid impact prevention method thereof in the present invention may also be adopted to avoid the liquid impact phenomenon when the fixed displacement single compressor is adopted.
In addition, in the above embodiment, the external pipe portion of the refrigerant pipe may also be provided with an insulating layer to adapt to different external temperature environments. Of course, the in-vehicle pipeline part of the refrigerant pipeline can be provided without an insulating layer, and at the moment, the in-vehicle pipeline part can be arranged in a relatively closed space so as to avoid the influence on the in-vehicle temperature and the generation of condensation as much as possible. Of course, it may be exposed to the vehicle.
Finally, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments without departing from the inventive concept, or some of the technical features may be replaced with equivalents. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The vehicle fixed displacement single compressor double-area air conditioning system comprises a compressor, a condenser and an evaporator;
the method is characterized in that:
the compressor is a fixed displacement single compressor;
the evaporator comprises a first evaporator and a second evaporator, and the first evaporator and the second evaporator are arranged in parallel; the first evaporator and the second evaporator are respectively used for corresponding to a first area and a second area on the vehicle;
the vehicle fixed-displacement single-compressor double-area air conditioning system also comprises a first temperature sensor, a switching valve and an air conditioning control module;
the first temperature sensor is arranged corresponding to the first evaporator and used for detecting the temperature of an evaporation core body of the first evaporator;
the switching valve is connected with the first evaporator in series and used for enabling the refrigerant to simultaneously pass through the first evaporator and the second evaporator when the switching valve is opened and enabling the refrigerant to only pass through the second evaporator when the switching valve is closed;
the switching valve is correspondingly provided with a switching valve state detection module for detecting the opening and closing state of the switching valve;
the air conditioner control module is in signal connection with the first temperature sensor and the switching valve state detection module and is in control connection with the switching valve and the fixed displacement single compressor;
the refrigeration demand of the first evaporator is less than the refrigeration demand of the second evaporator;
a first heat regenerator is arranged between the inlet side main pipeline and the outlet side main pipeline of the first evaporator and the second evaporator, and a second heat regenerator is arranged between the inlet side pipeline and the outlet side pipeline of the second evaporator;
the liquid refrigerant with high temperature and high pressure flowing out of the condenser exchanges heat with the gaseous refrigerant with low temperature and low pressure flowing out of the evaporator in the first heat regenerator;
the second heat regenerator heats the low-temperature and low-pressure gaseous refrigerant flowing out of the second evaporator;
when the switching valve is opened, the low-temperature low-pressure gaseous refrigerant flowing out of the second evaporator is heated by the second heat regenerator and then mixed with the low-temperature low-pressure gaseous refrigerant flowing out of the first evaporator to enter the first heat regenerator; when the switching valve is closed, the low-temperature low-pressure gaseous refrigerant flowing out of the second evaporator flows into the first heat regenerator after being heated by the second heat regenerator.
2. A fixed displacement single compressor dual zone air conditioning system for a vehicle as claimed in claim 1 wherein: the refrigerant pipeline of the air conditioning system comprises an in-vehicle pipeline part arranged in the vehicle body, and a heat insulation layer is arranged outside the in-vehicle pipeline part.
3. A fixed displacement single compressor dual zone air conditioning system for a vehicle as claimed in claim 1 wherein: the refrigerant pipeline of the air conditioning system comprises an outer pipeline part arranged outside the vehicle body, and the outer pipeline part is not provided with a heat insulation layer so as to exchange heat with the outside.
4. The liquid impact preventing method for the fixed displacement single compressor double-area air conditioning system for the vehicle is characterized by comprising the following steps of:
the method comprises the following steps that firstly, the temperature of an evaporation core body of a first evaporator in a first evaporator and a second evaporator which are arranged in parallel is detected, and the opening and closing state of a switching valve connected with the first evaporator in series is detected;
step two, judging whether the following conditions are satisfied: condition a: the temperature of an evaporation core of the first evaporator is higher than a set value; condition b: the temperature of an evaporation core body of the first evaporator is lower than a set value, and the switching valve is in a closed state;
step three, starting the compressor under the condition that the condition a or the condition b is met, otherwise, keeping the compressor not working;
when the condition a is satisfied, the control valve is in an open state condition: the low-temperature low-pressure gaseous refrigerant flowing out of the second evaporator is heated by the second heat regenerator and then mixed with the low-temperature low-pressure gaseous refrigerant flowing out of the first evaporator, and then enters the first heat regenerator; when the condition a is not met, controlling the switching valve to be in a closed state, so that the condition b is met, further starting the compressor, and enabling the low-temperature and low-pressure gaseous refrigerant flowing out of the second evaporator to flow into the first heat regenerator after being heated by the second heat regenerator;
the refrigeration demand of the first evaporator is less than the refrigeration demand of the second evaporator.
5. The liquid impact prevention method of a fixed displacement single compressor dual zone air conditioning system for a vehicle according to claim 4, wherein: and under the condition that only the first evaporator carries out refrigeration and has refrigeration requirement, the first and second evaporation fans corresponding to the first and second evaporators are operated simultaneously.
6. The method for preventing liquid impact of a fixed displacement single compressor dual zone air conditioning system for vehicles according to claim 5, wherein: the rotation speed of the second evaporation fan is restricted from falling below the set value to eliminate or reduce the feeling of coldness of the occupant in the second area.
7. The liquid impact prevention method of a fixed displacement single compressor dual zone air conditioning system for a vehicle according to claim 4, wherein: the refrigerant pipeline of the air conditioning system comprises an in-vehicle pipeline part arranged in the vehicle body, and an insulating layer is arranged outside the in-vehicle pipeline part; and/or the refrigerant pipeline of the air conditioning system comprises an external pipeline part arranged outside the vehicle body, and the external pipeline part is not provided with an insulating layer so that the external pipeline part exchanges heat with the outside.
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Address after: No. 6, Yutong Road, Guancheng Hui District, Zhengzhou, Henan 450061 Applicant after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Applicant before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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