CN113085481A - Air conditioning system, control method of air conditioning system and vehicle - Google Patents
Air conditioning system, control method of air conditioning system and vehicle Download PDFInfo
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- CN113085481A CN113085481A CN202110391050.7A CN202110391050A CN113085481A CN 113085481 A CN113085481 A CN 113085481A CN 202110391050 A CN202110391050 A CN 202110391050A CN 113085481 A CN113085481 A CN 113085481A
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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
- B60H1/00007—Combined heating, ventilating, or cooling devices
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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
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Abstract
The air conditioning system comprises a compressor, a condenser, an expansion valve and an evaporator which are sequentially communicated through a pipeline, and the air conditioning system further comprises a pressure reduction element arranged between the condenser and the expansion valve and a pressure boosting element arranged between the compressor and the evaporator, so that the pressure of the high-pressure side where the condenser is located is increased, and the pressure of the low-pressure side where the evaporator is located is reduced. The pressure reduction element additionally arranged on the low-pressure side plays a role in reducing temperature and pressure, so that the temperature and pressure of a refrigerant flowing through the expansion valve are lower, the evaporation temperature of the system is reduced, and the heat exchange capacity of the evaporator is improved; the supercharging element additionally arranged on the high-pressure side plays a role in warming and supercharging, so that a refrigerant before entering the compressor has certain pressure, the temperature cannot be too low, the performance of the compressor is improved, and the exhaust capacity of the compressor is improved. The compression ratio of the air conditioning system is increased without increasing the compressor power.
Description
Technical Field
The disclosure relates to the technical field of vehicle air conditioners, in particular to an air conditioning system, a control method of the air conditioning system and a vehicle.
Background
In the existing heat pump air conditioning system, the economizer absorbs heat through throttling evaporation of the refrigerant, so that the refrigerant in the path where the economizer is located does not participate in outdoor heat absorption, and unnecessary waste is caused. In addition, the existing ultralow temperature heat pump compressor realizes low-temperature heating by increasing the compression ratio, increasing the condensation temperature and reducing the evaporation temperature, so that the power of the compressor is inevitably increased, the energy consumption is overhigh when the vehicle is heated in winter, and especially for new energy automobiles, the energy consumption is overhigh, and the mileage of the whole vehicle is reduced.
Disclosure of Invention
An object of the present disclosure is to provide an air conditioning system, which increases the compression ratio of the air conditioning system without increasing the power of the compressor, and solves the problem of excessive energy consumption of the existing air conditioning system.
Another object of the present disclosure is to provide a control method of an air conditioning system, which is the air conditioning system provided by the present disclosure.
Another object of the present disclosure is to provide a vehicle including the air conditioning system provided by the present disclosure.
In order to achieve the above object, the present disclosure provides an air conditioning system, including the compressor, the condenser, the expansion valve and the evaporimeter that are linked together in proper order through the pipeline, air conditioning system is still including setting up the condenser with pressure reduction element between the expansion valve, and set up the compressor with pressure boost element between the evaporimeter, so that the pressure increase of the high pressure side at condenser place, the pressure of the low pressure side at evaporimeter place reduces.
Optionally, the voltage-decreasing element and the voltage-increasing element are configured such that | p01-p12|＝|p02-p11L, wherein P01Is the original pressure of the high-pressure side before passing through the pressure-increasing element, P02Is the original pressure of the low pressure side before passing through the pressure-reducing element, P11Is the pressure on the low-pressure side after passing through the pressure-reducing element, P12Is said high after passing through said pressurizing elementPressure on the pressure side.
Optionally, the air conditioning system further comprises a gas-liquid separator disposed between the compressor and the plenum member.
Optionally, the air conditioning system further comprises a dryer disposed between the condenser and the pressure reducing element.
Optionally, the air conditioning system further comprises a liquid level detection element disposed between the condenser and the pressure reducing element.
Optionally, the evaporation temperature of the evaporator is less than-20 ℃ and the condensation temperature of the condenser is 25-35 ℃.
Optionally, the air conditioning system further comprises a turbocharger, a turbine of the turbocharger is configured as the pressure reducing element, and a compressor of the turbocharger is configured as the pressure increasing element.
According to a second aspect of the present disclosure, there is also provided a control method of an air conditioning system, the air conditioning system being the above air conditioning system, the control method including:
the pressure reducing element and the pressure increasing element are controlled so that a decrease in the rear low-side pressure by the pressure reducing element is equal to an increase in the rear high-side pressure by the pressure increasing element.
Optionally, the air conditioning system further includes a liquid level detection element disposed between the condenser and the pressure reduction element, and the control method further includes:
and controlling the pressure reduction element and the pressure increasing element according to the liquid level information acquired by the liquid level detection element.
According to a third aspect of the present disclosure, a vehicle is provided, which includes the air conditioning system described above.
Through the technical scheme, the pressure reduction element additionally arranged on the low-pressure side plays a role in reducing the temperature and the pressure, so that the temperature and the pressure of the refrigerant flowing through the expansion valve are lower, the evaporation temperature of the system is reduced, and the heat exchange capacity of the evaporator is improved; the supercharging element additionally arranged on the high-pressure side plays a role in warming and supercharging, so that a refrigerant before entering the compressor has certain pressure, the temperature cannot be too low, the performance of the compressor is improved, and the exhaust capacity of the compressor is improved. In addition, the high pressure of the air conditioning system is made higher and the low pressure is made lower without increasing the compressor power, i.e. the compression ratio of the air conditioner is increased.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a prior art air conditioning system;
FIG. 2 is a schematic diagram of an air conditioning system provided in an exemplary embodiment of the present disclosure;
fig. 3 is a flowchart of a control method of an air conditioning system according to an exemplary embodiment of the present disclosure;
fig. 4 is a comparison of pressure-enthalpy diagrams for an air conditioning system provided by an exemplary embodiment of the present disclosure and a prior art air conditioning system.
Description of the reference numerals
1 turbocharger 11 pressure reduction element
12 supercharging element 2 compressor
3 condenser 4 expansion valve
5 6 gas-liquid separator of evaporator
7 drier 8 liquid level detection element
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
In the present disclosure, unless otherwise stated, directional terms such as "upstream" and "downstream" are used to define the flow direction of the refrigerant. Further, in the following description, when referring to the figures, the same reference numbers in different figures denote the same or similar elements.
In the conventional air conditioning system, as shown in fig. 1, the cooling principle is as follows: the side where the condenser 3 is located is a high-pressure side (as shown by a solid line in the figure), the side where the evaporator 5 is located is a low-pressure side (as shown by a broken line in the figure), the refrigerant is compressed into a high-temperature high-pressure gaseous refrigerant by the compressor 2, is conveyed to the condenser 3 for cooling, is changed into a medium-temperature high-pressure liquid refrigerant after being cooled, is throttled and decompressed by the expansion valve 4 to be changed into a low-temperature low-pressure liquid refrigerant, is conveyed to the evaporator 5 for absorbing heat, is evaporated into a low-temperature low-pressure gaseous refrigerant, and then returns to. The refrigerant flows in the condenser 3 and the evaporator 5 in the opposite direction to that in the cooling operation by a four-way valve in the heating operation. The air conditioning system increases the compression ratio, namely the ratio of high pressure to low pressure, improves the condensing temperature of the condenser 3 and reduces the evaporating temperature of the evaporator 5 to realize low-temperature heating, but the power of the compressor 2 is increased, the energy consumption is high, and the endurance mileage of the whole vehicle is influenced particularly for a new energy automobile.
In view of the above problems, as shown in fig. 2, the present disclosure provides an air conditioning system including a compressor 2, a condenser 3, an expansion valve 4, and an evaporator 5 sequentially communicated with each other through a pipeline, and further including a pressure reducing element 11 disposed between the condenser 3 and the expansion valve 4, and a pressure increasing element 12 disposed between the compressor 2 and the evaporator 5, such that a pressure of a high pressure side where the condenser 3 is located is increased and a pressure of a low pressure side where the evaporator 5 is located is decreased. Here, the high-temperature and high-pressure liquid refrigerant applies work to the pressure reducing element 11, converts potential energy into mechanical energy, and plays a role in reducing temperature and pressure for the refrigerant, and conversely, the pressure increasing element 12 applies work to the gaseous refrigerant, and plays a role in increasing temperature and pressure for the refrigerant, and any component capable of achieving the above functions belongs to the protection scope of the present disclosure.
In the air conditioning system provided by the present disclosure, a refrigerant is compressed into a high-temperature high-pressure gas by a compressor 2 and enters a condenser 3 for cooling, the refrigerant is changed into a low-temperature low-pressure liquid and enters a pressure reduction element 11, the pressure reduction element 11 is acted, and the temperature and the pressure are reduced again and enter an expansion valve 4. After the refrigerant is decompressed by the expansion valve 4, the refrigerant is changed into low-temperature low-pressure liquid, enters the evaporator 5 to absorb heat and is changed into low-temperature low-pressure gas, and enters the pressurizing element 12, the pressurizing element 12 applies work to the low-temperature low-pressure gas, and the low-temperature low-pressure gas returns to the compressor 2 after being heated and pressurized to continue circulation.
Through the technical scheme, the pressure reduction element 11 additionally arranged on the low-pressure side plays a role in reducing the temperature and the pressure, so that the temperature and the pressure of the refrigerant flowing through the expansion valve 4 are lower, the evaporation temperature of the system is reduced, and the heat exchange capacity of the evaporator 5 is improved; the supercharging element 12 additionally arranged on the high-pressure side plays a role in warming and supercharging, so that a refrigerant before entering the compressor 2 has certain pressure, the temperature cannot be too low, the performance of the compressor 2 is improved, and meanwhile the exhaust capacity of the compressor 2 is improved. In addition, the high pressure of the air conditioning system is made higher and the low pressure is made lower, i.e. the compression ratio of the air conditioner is increased, without increasing the power of the compressor 2.
Further, the voltage-decreasing element 11 and the voltage-increasing element 12 are configured such that | p01-p12|＝|p02-p11L, wherein P01Is the original pressure, P, on the high-pressure side before passing through the pressure-increasing element 1202Is the original pressure of the low pressure side before the pressure reduction element 11, P11Is the pressure on the low-pressure side after passing through the pressure-reducing element 11, P12The pressure on the high pressure side after passing through the pressurizing element 12. That is, the decrease value of the pressure of the low-pressure side after passing through the pressure decreasing element 11 is equal to the increase value of the pressure of the high-pressure side after passing through the pressure increasing element 12, so that the pressure difference before and after the expansion valve 4 is not changed after the pressure decreasing element 11 and the pressure increasing element 12 are provided, the opening degree of the expansion valve 4 is not affected, the flow rate of the refrigerant flowing through the expansion valve 4 is not decreased, but the temperature and the pressure of the refrigerant at the downstream of the expansion valve 4 are lower, and the evaporation temperature of the air conditioning.
As shown in fig. 2, the air conditioning system provided by the present disclosure further includes a gas-liquid separator 6, and the gas-liquid separator 6 is disposed between the compressor 2 and the pressurizing member 12. The gas-liquid separator 6 is arranged at the downstream of the supercharging element 12, the low-temperature and low-pressure gaseous refrigerant is heated and supercharged from the supercharging element 12 and then enters the gas-liquid separator 6, the gas-liquid separator 6 can separate part of liquid drops in the amount of the gaseous refrigerant, the separated gaseous refrigerant enters the compressor 2 to continue to circulate, and the gas-liquid separator 6 can prevent the liquid refrigerant from being sucked by the compressor 2 to cause the liquid impact phenomenon of the compressor 2, so that the service life of the compressor 2 is prolonged, and the stability and the service life of the air conditioning system are improved.
Referring to fig. 2, the air conditioning system provided by the present disclosure further includes a dryer 7, such as a receiver dryer, disposed between the condenser 3 and the pressure reducing element 11. The refrigerant is cooled by the condenser 3 to become a sub-high temperature and sub-high pressure liquid, and the liquid refrigerant is dried by the dryer 7 and then enters the pressure reduction element 11 to apply work to the pressure reduction element 11, so that the effects of reducing temperature and reducing pressure are achieved. The refrigerant after temperature and pressure reduction enters an expansion valve 4 arranged at the downstream of the pressure reduction element 11, and further the temperature and pressure reduction effect is carried out. In addition, the dryer 7 can block impurities in the air conditioning system, and prevent the air conditioning system from being blocked and incapable of operating normally.
Referring to fig. 2, the air conditioning system further includes a liquid level detection element 8, such as a sight glass, disposed between the condenser 3 and the pressure reducing element 11. The liquid level detection element 8 can be arranged at the upstream of the pressure reduction element 11, the liquid level height and the flowing condition of the refrigerant flowing through the condenser 3 in the air conditioning system are observed through the liquid level detection element 8 observation mirror, whether the refrigerant has the working capacity for the pressure reduction element 11 or not is judged, and the worker can conveniently troubleshoot the air conditioning system and control the pressure reduction element 11.
The air conditioning system provided by the disclosure can improve the supercooling degree of the evaporator 5 end, can reduce the pressure behind the expansion valve 4, further can reduce the evaporation temperature of the system, can increase the temperature and the pressure of the high-pressure side of the condenser 3, and can improve the condensation temperature of the system, specifically, in the air conditioning system, the evaporation temperature of the evaporator 5 can be less than-20 ℃, and the condensation temperature of the condenser 3 can be 25-35 ℃, preferably 30 ℃. The evaporator 5 has good heat absorption capacity, the refrigeration effect is improved, and the condenser 3 has good heat release capacity, and the heating effect is improved.
The air conditioning system provided by the present disclosure further includes a turbocharger 1, a turbine of the turbocharger 1 may be configured as the above-described pressure reducing element 11, and a compressor of the turbocharger 1 may be configured as the above-described pressure increasing element 12. In the embodiment, the high-temperature and high-pressure liquid refrigerant flowing out of the condenser 3 applies work to the turbine to perform the functions of reducing temperature and pressure, and the waste heat of the condenser 3 is transmitted to the air inlet of the compressor 2 through mechanical energy, so that the supercooling degree of the evaporator 5 at the downstream of the expansion valve 4 is improved, the evaporation temperature of the evaporator 5 is reduced, and the heat exchange efficiency of the evaporator 5 is further improved. The low-temperature low-pressure gaseous refrigerant flowing out of the evaporator 5 enters the compressor, and the compressor does work on the gaseous refrigerant, so that the refrigerant before entering the compressor 2 has certain pressure and the temperature is not too low, the performance of the compressor 2 is improved, and the exhaust pressure of the compressor 2 is improved. The energy efficiency ratio of the air conditioning system is improved under the condition of not increasing the power of the compressor 2. In addition, all the refrigerants in the air conditioning system provided by the disclosure participate in outdoor heat absorption, so that unnecessary waste can be avoided.
As shown in fig. 4, 1-2-3-4-1 is a pressure-enthalpy diagram of the conventional air conditioning system in fig. 1, and 1 '-1-2-3-3' -4 '-1' is a pressure-enthalpy diagram of the air conditioning system provided by the present disclosure, wherein 3-3 'is a process in which a refrigerant applies work to the pressure reducing element 11, and 1' -1 is a process in which the pressure increasing element 12 applies work to the refrigerant. As shown in the figure, the low pressure of the air conditioning system is reduced, the corresponding compression ratio is increased, and the energy efficiency ratio of the air conditioning system is improved on the premise of not increasing the power of the compressor 2.
In a second aspect of the present disclosure, there is provided a control method of an air conditioning system, the air conditioning system being the air conditioning system described above, with reference to fig. 3, the control method including: step 102, the pressure decreasing element 11 and the pressure increasing element 12 are controlled so that the decrease in the rear low-side pressure by the pressure decreasing element is equal to the increase in the rear high-side pressure by the pressure increasing element. In step S102, the pressure reducing element 11 and the pressure increasing element 12 are controlled, for example, the size and structure of the turbine are changed, the power of the compressor is changed, and the reduced value of the low-pressure side pressure is controlled to be equal to the increased value of the high-pressure side pressure, so that the opening degree of the expansion valve 4 is not affected, and the reduction of the refrigerant flow passing through the expansion valve 4 due to the reduction of the pressure difference between the upstream and downstream of the expansion valve 4 is avoided. The temperature of the refrigerant reduced by the pressure reducing element 11 is lower than the temperature of the refrigerant at the downstream of the expansion valve 4, so that the evaporation temperature of the evaporator 5 at the downstream of the expansion valve 4 is reduced, and the heat exchange capacity of the evaporator 5 is improved. The vaporized gaseous refrigerant is heated and pressurized by the pressurizing element 12, so that the refrigerant entering the compressor 2 has a certain pressure and the temperature is not too low, thereby improving the low performance of the compressor 2 and the exhaust pressure of the compressor 2.
Accordingly, in the control method of the air conditioning system provided by the present disclosure, the control method further includes: step 101, according to the liquid level information obtained by the liquid level detection element 8, the pressure reduction element 11 and the pressurization element 12 are controlled, and the working capacity of the turbine is determined by the flow of the liquid refrigerant flowing out of the condenser 3, so that the working degree of the compressor can be controlled according to the detected liquid level condition, and under the condition that the pressure reduction element 11 and the pressurization element 12 do not adopt a turbocharger, the pressure reduction element 11 and the pressurization element 12 can be synchronously controlled according to the liquid level, so that the reduction value of the low-pressure side pressure is equal to the increase value of the high-pressure side pressure, and the maintenance and the timely supplement of the refrigerant in the air conditioning system are effectively facilitated for workers.
In a third aspect of the present disclosure, a vehicle is provided, which comprises the air conditioning system introduced above. All the advantages of the vehicle having the air conditioning system are not described in detail herein.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. The utility model provides an air conditioning system, includes compressor (2), condenser (3), expansion valve (4) and evaporimeter (5) that are linked together in proper order through the pipeline, its characterized in that, air conditioning system is still including setting up condenser (3) with pressure reduction element (11) between expansion valve (4), and set up compressor (2) with pressure boost element (12) between evaporimeter (5), so that the pressure increase of the high pressure side at condenser (3) place, the pressure of the low pressure side at evaporimeter (5) place reduces.
2. Air conditioning system according to claim 1, characterized in that the pressure reducing element (11) and the pressure increasing element (12) are configured such that | p01-p12|＝|p02-p11L, wherein P01Is the original pressure of the high-pressure side before passing through the pressure-increasing element (12), P02Is the original pressure of the low-pressure side before passing through the pressure-reducing element (11), P11Is the pressure on the low-pressure side after passing through the pressure-reducing element (11), P12Is the pressure on the high-pressure side after passing through the pressurizing element (12).
3. Air conditioning system according to claim 1, characterized in that it further comprises a gas-liquid separator (6), said gas-liquid separator (6) being arranged between said compressor (2) and said supercharging element (12).
4. Air conditioning system according to claim 1, characterized in that it further comprises a dryer (7) arranged between the condenser (3) and the pressure reducing element (11).
5. Air conditioning system according to claim 1, characterized in that it further comprises a liquid level detection element (8) arranged between the condenser (3) and the pressure reducing element (11).
6. Air conditioning system according to claim 1, characterized in that the evaporation temperature of the evaporator (5) is less than-20 ℃ and the condensation temperature of the condenser (3) is 25-35 ℃.
7. Air conditioning system according to any of claims 1-6, characterized in that the air conditioning system further comprises a turbocharger (1), the turbine of the turbocharger (1) being configured as the pressure reducing element (11), the compressor of the turbocharger (1) being configured as the pressure increasing element (12).
8. A control method of an air conditioning system, characterized in that the air conditioning system is the air conditioning system according to any one of claims 1 to 7, the control method comprising:
the pressure reducing element (11) and the pressure increasing element (12) are controlled so that the reduction value of the rear low-side pressure by the pressure reducing element (11) is equal to the increase value of the rear high-side pressure by the pressure increasing element (12).
9. The control method of an air conditioning system according to claim 8, characterized in that the air conditioning system further comprises a liquid level detection element (8) provided between the condenser (3) and the pressure reducing element (11), the control method further comprising:
and controlling the pressure reduction element (11) and the pressure increasing element (12) according to the liquid level information acquired by the liquid level detection element (8).
10. A vehicle, characterized in that the vehicle comprises an air conditioning system according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110391050.7A CN113085481A (en) | 2021-04-12 | 2021-04-12 | Air conditioning system, control method of air conditioning system and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110391050.7A CN113085481A (en) | 2021-04-12 | 2021-04-12 | Air conditioning system, control method of air conditioning system and vehicle |
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| CN113085481A true CN113085481A (en) | 2021-07-09 |
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| CN202110391050.7A Withdrawn CN113085481A (en) | 2021-04-12 | 2021-04-12 | Air conditioning system, control method of air conditioning system and vehicle |
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Application publication date: 20210709 |
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