CN117067864A - Control method of air conditioning system - Google Patents

Control method of air conditioning system Download PDF

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Publication number
CN117067864A
CN117067864A CN202310855475.8A CN202310855475A CN117067864A CN 117067864 A CN117067864 A CN 117067864A CN 202310855475 A CN202310855475 A CN 202310855475A CN 117067864 A CN117067864 A CN 117067864A
Authority
CN
China
Prior art keywords
compressor
air conditioning
conditioning system
valves
control method
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310855475.8A
Other languages
Chinese (zh)
Inventor
闫振国
李栋梁
闫红波
刘龙晓
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Smart Technology R&D Co Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Smart Technology R&D Co Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Smart Technology R&D Co Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202310855475.8A priority Critical patent/CN117067864A/en
Publication of CN117067864A publication Critical patent/CN117067864A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • 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
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B60H1/00885—Controlling the flow of heating or cooling liquid, e.g. valves or pumps
    • 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
    • B60H1/3216—Control means therefor for improving a change in operation duty of a compressor in a vehicle
    • 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
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3255—Cooling devices information from a variable is obtained related to temperature

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention relates to the technical field of air conditioners, in particular to a control method of an air conditioning system, and aims to solve the problem that the energy consumption is high when a set of compressors is adopted to drive a plurality of devices in the existing air conditioning system. To this end, the control method of the air conditioning system of the present invention includes: acquiring the actual temperature and the preset temperature of all running equipment; adjusting the opening of a corresponding valve according to the actual temperature and the preset temperature of the equipment; and determining the operation frequency of the compressor according to the opening degrees of all the valves. The opening degree of all valves can feed back the requirements of all devices on the refrigerant flow, and the smaller the requirements on the refrigerant flow, the lower the requirements on the running power of the compressor. The operation frequency of the compressor is controlled by the requirement of all the equipment on the refrigerant flow, so that the operation frequency of the compressor can be matched with the current state of all the equipment, and the refrigerant can be reasonably utilized according to the requirement of each equipment, so that the energy utilization efficiency is improved.

Description

Control method of air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method of an air conditioning system.
Background
At present, an air conditioning system comprises an outdoor unit and two or more indoor units, wherein the two or more indoor units are driven to work simultaneously by the outdoor unit.
The air conditioning system for refrigerating only comprises a compressor, a first heat exchanger, an expansion valve and a second heat exchanger, wherein a refrigerant flowing out of an outlet of the compressor sequentially flows through the second heat exchanger, the expansion valve and the first heat exchanger, the compressor compresses a low-temperature low-pressure gaseous refrigerant into a high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into a medium-temperature medium-pressure liquid refrigerant through the second heat exchanger, heat is released to the outside, the liquid refrigerant enters the expansion valve for throttling, and then absorbs heat through the first heat exchanger, so that the liquid refrigerant is evaporated to form a gaseous state, and then enters the compressor for compression and pressurization, the reciprocating circulation is realized, and the heat is absorbed by the first heat exchanger for refrigerating. The compressor, the second heat exchanger and the expansion valve are all arranged in the outdoor unit, the first heat exchanger is arranged in the indoor units, and each indoor unit is provided with one first heat exchanger.
The air conditioning system has the disadvantage that the compressor is difficult to perform variable frequency adjustment due to inconsistent working conditions of the plurality of indoor units, otherwise, the operation of the indoor units may be disturbed, that is, the refrigerating or heating effect is unstable. Therefore, the air conditioning system generally runs at full load so as to ensure stable running of a plurality of indoor units and higher energy consumption.
Therefore, a control method of an air conditioning system is needed at present to solve the problem that the energy consumption is high when a set of compressors is adopted to drive a plurality of devices in the existing air conditioning system.
Disclosure of Invention
The invention aims to solve the technical problem that the energy consumption is high when the existing air conditioning system adopts one set of compressor to drive a plurality of devices.
In a first aspect, the present invention provides a control method of an air conditioning system, where the air conditioning system includes a compressor and at least two devices, the compressor can deliver a refrigerant to the devices through refrigerant pipelines to cool or heat, and valves capable of adjusting opening degrees are disposed on the refrigerant pipelines in the devices; the control method of the air conditioning system comprises the following steps: acquiring the actual temperature and the preset temperature of all the running devices; adjusting the opening of the corresponding valve according to the actual temperature and the preset temperature of the equipment; and determining the operation frequency of the compressor according to the opening degrees of all the valves.
In a specific embodiment of the above control method of an air conditioning system, the "adjusting the opening of the corresponding valve according to the actual temperature and the preset temperature of the device" includes: calculating and obtaining a difference value between the actual temperature and the preset temperature of each device; and adjusting the opening of the corresponding valve according to the difference value between the actual temperature and the preset temperature of the equipment.
In a specific embodiment of the above control method of an air conditioning system, "determining the operating frequency of the compressor according to the opening degrees of all the valves" includes: obtaining a pipeline coefficient K of each device; acquiring the opening SZ of a valve corresponding to each device; calculating to obtain calculated opening degrees of all the valves, wherein the calculated opening degrees of all the valves areWherein x is the total number of said devices carried by said compressor; and adjusting the operation frequency of the compressor according to the calculated opening degrees of all the valves.
In a specific embodiment of the above control method of an air conditioning system, "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" includes: and if the calculated opening degrees of all the valves are larger than a first preset opening degree, the compressor operates at a first frequency.
In a specific embodiment of the above control method of an air conditioning system, "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" further includes: and if the calculated opening degrees of all the valves are smaller than the second preset opening degree, the compressor operates at a third frequency.
In a specific embodiment of the above control method of an air conditioning system, "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" further includes: and if the calculated opening degrees of all the valves are larger than the second preset opening degree and smaller than the first preset opening degree, the compressor operates at the second frequency.
In a specific embodiment of the control method of an air conditioning system, the air conditioning system is applied to a vehicle, the compressor includes a first compressor driven by an engine of the vehicle and a second compressor driven by a battery of the vehicle; the air conditioning system further comprises a reversing valve, wherein the reversing valve is connected with the first compressor and the second compressor through pipelines, at least one device is shared equipment, and switching the reversing valve can enable the first compressor or the second compressor to convey a refrigerant to the shared equipment; the control method of the air conditioning system further comprises the following steps: acquiring the rotating speed of the engine; and controlling the first compressor or the second compressor to work according to the rotating speed of the engine, and switching the reversing valve to enable one of the first compressor and the second compressor to be in a working state to convey the refrigerant to the common equipment.
In a specific embodiment of the control method of an air conditioning system, the "controlling the operation of the first compressor or the second compressor according to the rotation speed of the engine, and switching the reversing valve to make one of the first compressor and the second compressor in an operating state deliver refrigerant to the common equipment" includes: if the engine speed is not lower than a preset value, a first compressor is started, and the reversing valve is switched, so that the first compressor conveys a refrigerant to the common equipment; and/or if the engine speed is lower than a preset value, starting a second compressor, and switching the reversing valve to enable the second compressor to convey the refrigerant to the common equipment.
In a specific embodiment of the above control method of an air conditioning system, the control method of an air conditioning system further includes: acquiring the opening and closing state of each device; and determining whether to open the corresponding valve according to the opening and closing state of each device.
In a specific embodiment of the above control method of an air conditioning system, determining whether to open the corresponding valve according to the on-off state of each device includes: if the equipment is in a closed state, closing the corresponding valve; and/or if the equipment is in an open state, opening the corresponding valve.
Compared with the prior art, the invention has the following beneficial effects:
the control method of the air conditioning system provided by the invention comprises the following steps: acquiring the actual temperature and the preset temperature of all running equipment; adjusting the opening of a corresponding valve according to the actual temperature and the preset temperature of the equipment; and determining the operation frequency of the compressor according to the opening degrees of all the valves. The opening degree of all valves can feed back the requirements of all devices on the refrigerant flow, and the smaller the requirements on the refrigerant flow, the lower the requirements on the running power of the compressor. The operation frequency of the compressor is controlled by the requirement of all the equipment on the refrigerant flow, so that the operation frequency of the compressor can be matched with the current state of all the equipment, and the refrigerant can be reasonably utilized according to the requirement of each equipment, so that the energy utilization efficiency is improved.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of main steps of a control method of an air conditioning system according to an embodiment of the present invention;
fig. 2 is a flowchart of determining an operation frequency of a compressor according to the opening degrees of all valves in the first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a control method of an air conditioning system according to an embodiment of the present invention;
fig. 4 is a pipeline diagram of an air conditioning system according to a second embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a reversing valve according to a second embodiment of the present invention in a first valve position;
FIG. 6 is a schematic cross-sectional view of a reversing valve according to a second embodiment of the present invention in a second valve position;
fig. 7 is a flowchart illustrating detailed steps of a control method of an air conditioning system according to a second embodiment of the present invention.
Reference numerals illustrate:
11. a first compressor; 12. a first condenser; 13. a first expansion valve; 14. a second evaporator; 15. a first delivery tube; 16. a first return pipe; 17. a second valve;
21. a second compressor; 22. a second condenser; 23. a second expansion valve; 24. a third evaporator; 25. a second delivery tube; 26. a second return pipe; 27. a third valve;
3. a first evaporator; 31. a first tube; 32. a second tube; 33. a first valve; 4. a reversing valve; 41. a valve body; 42. a valve core; 421. a first channel; 422. and a second channel.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected, can be indirectly connected through an intermediate medium, and can also be communicated with the inside of two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Example 1
The invention provides an air conditioning system, which aims to solve the problem that the energy consumption is high when a set of compressors is adopted to drive a plurality of devices in the existing air conditioning system.
Taking an air conditioning system for refrigerating only as an example, the air conditioning system provided by the invention comprises a compressor, a condenser, an expansion valve and at least two devices, wherein an evaporator is arranged in each device. In a specific example of the invention, the apparatus comprises two evaporators of the two apparatuses arranged in parallel. The refrigerant flowing out of the outlet of the compressor sequentially flows through the condenser and the expansion valve, then enters the two evaporators, the compressor compresses the low-temperature low-pressure gaseous refrigerant into the high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into the medium-temperature medium-pressure liquid refrigerant through the condenser, heat is released to the outside, the liquid refrigerant enters the expansion valve for throttling, and then absorbs heat through the two evaporators, so that the liquid refrigerant is evaporated to form a gaseous state, and then enters the compressor for compression and pressurization, and the reciprocating circulation is realized, and the heat is absorbed by the two evaporators for refrigeration.
The equipment can be an air conditioner indoor unit, a refrigeration house, a refrigerator, a heat pump unit and the like. It should be noted that the types of the devices may be the same or different.
In addition, although the air conditioning system is used for cooling in the example of the present invention, this is not a specific limitation of the present invention, and the air conditioning system provided by the present invention may also be used for heating without departing from the principles of the present invention. Specifically, when the air conditioning system is used for heating, the refrigerant provided by the compressor sequentially flows through the two evaporators, and then flows through the expansion valve and the condenser after converging, so that the refrigerant releases heat at the two evaporators to realize heating.
A valve capable of adjusting the opening degree is arranged on a refrigerant pipeline in the device. Specifically, a first control valve is arranged on a pipeline of an inlet or an outlet of one evaporator, and a second control valve is arranged at the inlet or the outlet of the other evaporator. By controlling the opening degree of the first control valve, the flow rate of the refrigerant flowing through the first evaporator can be controlled. By controlling the opening degree of the second control valve, the flow rate of the refrigerant flowing through the second evaporator can be controlled. The larger the flow rate of the refrigerant flowing through the two evaporators, the better the refrigerating or heating effect.
During the flow of the refrigerant, the amount of refrigerant distributed to the two evaporators is related to not only the opening degree of the first control valve and the second control valve, but also the section and the length of the refrigerant pipe in the device. The larger the cross section of the refrigerant pipe, the shorter the length, and the larger the flow rate of the refrigerant branched to the device. Let the pipe coefficient of the refrigerant pipe of the equipment be K. The pipe coefficient K is positively correlated with the section of the refrigerant pipe and negatively correlated with the length of the refrigerant pipe. The larger the section of the refrigerant pipe is, the shorter the length is, and the larger the pipe coefficient K is.
The pipe coefficient K can be obtained by measuring the pipe resistance, and is set to 1 with reference to the pipe coefficient K of the device having the smallest pipe resistance. The pipe coefficients of the remaining equipment are the ratio of the minimum pipe resistance to the pipe resistance of the equipment.
The air conditioning system provided by the embodiment of the invention further comprises a control module, and the control module can execute the control method of the air conditioning system. As shown in fig. 1, the control method of the air conditioning system mainly includes the following steps:
s1, acquiring the actual temperature and the preset temperature of each device. The preset temperature is a temperature preset by a user, i.e., a temperature that the device is expected to reach. The preset temperature may be set according to the needs of the user.
S2, adjusting the opening of the valve corresponding to each device according to the actual temperature and the preset temperature of each device. The method specifically comprises the following steps:
s21, calculating and obtaining a difference value between the actual temperature and the preset temperature of each device.
S22, adjusting the opening of the corresponding valve according to the difference value between the actual temperature and the preset temperature of the equipment. The larger the difference between the actual temperature and the preset temperature of the equipment is, the larger the opening of the corresponding valve is, the larger the flow of the refrigerant flowing through the equipment is, and the better the refrigerating or heating effect of the equipment is. It should be noted that, the functional relation between the difference value of the actual temperature and the preset temperature and the valve opening is built in the air conditioning system, and the function can be adjusted according to the specific requirements of the equipment, so that the difference value of the actual temperature and the preset temperature can be ensured to be positively correlated with the valve opening.
S3, determining the operation frequency of the compressor according to the opening degrees of all the valves. As shown in fig. 2, the step S3 specifically includes the following steps:
s31, obtaining a pipeline coefficient K of each device.
S32, acquiring the opening SZ of the valve corresponding to each device.
S33, calculating to obtain the calculated opening of all valves. The calculated opening degree of all valves is the sum of the calculated opening degree of each valve, the calculated opening degree of each valve is K x SZ, and the calculated opening degree of all valves isWhere x is the total number of devices carried by the compressor, i.e. the total number of devices through which the refrigerant flows. The lower the calculated opening of each valve, the less the flow of refrigerant through the device, the closer the actual temperature of the device is to the preset temperature. The sum of the calculated opening degrees of all the valves can feed back the requirements of all the equipment on the refrigerant flow, and the smaller the requirements on the refrigerant flow, the lower the requirements on the running power of the compressor. The operation frequency of the compressor is controlled by the requirement of all the devices on the refrigerant flow, so that the operation frequency of the compressor can be matched with the current state of all the devices, and the refrigerant can be reasonably utilized according to the requirement of each device so as to improve the energyThe utilization efficiency of the amount.
S34, adjusting the operation frequency of the compressor according to the calculated opening degrees of all the valves. Specifically, if the calculated opening degrees of all the valves are larger than a first preset opening degree, the compressor operates at a first frequency; if the calculated opening degrees of all the valves are smaller than the second preset opening degree, the compressor operates at a third frequency; and if the calculated opening degrees of all the valves are larger than the second preset opening degree and smaller than the first preset opening degree, the compressor operates at the second frequency. The first preset opening degree and the second preset opening degree are gradually reduced, and the first frequency, the second frequency and the third frequency are gradually reduced.
It should be noted that, although in the example of the present invention, the operation frequency of the compressor is set to the third gear when the operation frequency of the compressor is adjusted according to the calculated opening degrees of all the valves, this is not a specific limitation of the present invention, and those skilled in the art may set the operation frequency of the compressor to more gears according to the calculated opening degrees of all the valves without departing from the principle of the present invention, which is included in the protection scope of the present invention.
Still further, as shown in fig. 3, the control method of the air conditioning system further includes:
s0, acquiring the opening and closing states of each device.
And S01, determining whether to open the corresponding valve according to the opening and closing state of each device. Specifically, if the device is in a closed state, closing the corresponding valve; and if the equipment is in an open state, opening the corresponding valve. After the valve is closed, the valve opening SZ is zero.
Step S0 and step S01 are performed before step S1.
Example two
The embodiment of the invention provides an air conditioning system, which is applied to a vehicle and comprises a first refrigerating system and a second refrigerating system. The first refrigeration system is driven by the engine and is started after the vehicle is started. The second refrigeration system utilizes the battery of the vehicle as an energy source and can be started when the vehicle is parked. The first refrigeration system and the second refrigeration system are substantially identical in structure to the air conditioning system provided in one of the embodiments.
As shown in fig. 4, the air conditioning system further includes a reversing valve 4, and the reversing valve 4 is connected to the first refrigeration system and the second refrigeration system through a pipe. Some of the devices are common devices, and switching the reversing valve 4 enables the first refrigeration system and the second refrigeration system to deliver refrigerant to the common devices. When the vehicle is started, the switching valve 4 is switched to connect the first refrigeration system to the common equipment, so that the common equipment can operate when the vehicle is started. When the vehicle is parked, the switching valve 4 is switched to connect the second refrigeration system to the common equipment, so that the common equipment can be operated when the vehicle is parked. The refrigerant can be supplied only by one of the first refrigeration system and the second refrigeration system, except for the common equipment.
Specifically, in the example of the present invention, the common device is a refrigerator, and the remaining devices are a vehicle-mounted air conditioner that performs cooling by a first cooling system and a parking air conditioner that performs cooling by a second cooling system.
The first refrigerating system comprises a first compressor 11, a first condenser 12, a first expansion valve 13 and a second evaporator 14, wherein the first compressor 11, the first condenser 12, the first expansion valve 13 and the second evaporator 14 are sequentially communicated through pipelines to form a circulating loop, refrigerant is filled in the loop, the first compressor 11 can compress low-temperature low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into medium-temperature medium-pressure liquid refrigerant through the first condenser 12, heat is released to the outside, the liquid refrigerant enters the first expansion valve 13 for throttling, and then absorbs heat through the second evaporator 14, so that the liquid refrigerant is evaporated to form a gaseous state, and then enters the first compressor 11 for compression and pressurization, and the reciprocating circulation is achieved.
The first compressor 11 is driven by the engine of the vehicle, and after the vehicle is started, the engine is rotated, so that the first compressor 11 can be driven to operate, and refrigeration is realized at the second evaporator 14. The second evaporator 14 is provided in the vehicle-mounted air conditioner, and cools the vehicle-mounted air conditioner.
The second refrigerating system comprises a second compressor 21, a second condenser 22, a second expansion valve 23 and a third evaporator 24, wherein the second compressor 21, the second condenser 22, the second expansion valve 23 and the third evaporator 24 are sequentially communicated through pipelines to form a circulating loop, the loop is filled with refrigerant, the second compressor 21 can compress low-temperature low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into medium-temperature medium-pressure liquid refrigerant through the second condenser 22, heat is released to the outside, the liquid refrigerant enters the second expansion valve 23 for throttling, and then absorbs heat through the third evaporator 24, so that the liquid refrigerant is evaporated to form gas, and then enters the second compressor 21 for compression and pressurization, and the reciprocating circulation is realized.
The third evaporator 24 is provided in the parking air conditioner, and cools the parking air conditioner. The second compressor 21 is driven using the battery of the vehicle. While the vehicle is stationary, the battery of the vehicle can provide energy to the second compressor 21, effecting refrigeration at the third evaporator 24.
In addition, the vehicle refrigeration system provided by the invention further comprises a first evaporator 3 and a reversing valve 4, wherein the first evaporator 3 is arranged in the refrigerator. The first evaporator 3 has a first tube 31 and a second tube 32 connected to an inlet and an outlet, respectively. The outlet of the first expansion valve 13 is connected to a first delivery pipe 15, and the inlet of the first compressor 11 is connected to a first return pipe 16. The outlet of the second expansion valve 23 is connected to a second delivery pipe 25, and the inlet of the second compressor 21 is connected to a second return pipe 26.
The first delivery pipe 15, the first return pipe 16, the second delivery pipe 25, the second return pipe 26, the first pipe 31 and the second pipe 32 are connected to the directional valve 4. The reversing valve 4 can be switched to place the first pipe 31 in communication with the first delivery pipe 15 and the second pipe 32 in communication with the first return pipe 16, or to place the first pipe 31 in communication with the second delivery pipe 25 and the second pipe 32 in communication with the second return pipe 26. When the first pipe 31 communicates with the first delivery pipe 15 and the second pipe 32 communicates with the first return pipe 16, the refrigerant flowing out of the first expansion valve 13 can enter the first evaporator 3, and at this time, refrigeration can be achieved at the first evaporator 3 by the first compressor 11. When the first pipe 31 communicates with the second delivery pipe 25 and the second pipe 32 communicates with the second return pipe 26, the refrigerant flowing out of the second expansion valve 23 can enter the first evaporator 3, and at this time, work can be performed by the second compressor 21, thereby realizing refrigeration at the first evaporator 3.
When the vehicle is started, the engine can drive the first compressor 11, the reversing valve 4 is switched, the first evaporator 3 is communicated with the first compressor 11, and refrigeration is realized at the first evaporator 3 and the second evaporator 14 through the work of the first compressor 11, namely, the vehicle-mounted air conditioner and the refrigerator are refrigerated. When the vehicle is parked, the battery of the vehicle can drive the second compressor 21, the reversing valve 4 is switched, the first evaporator 3 is communicated with the second compressor 21, the second compressor 21 does work, and refrigeration is realized at the first evaporator 3 and the third evaporator 24, namely, the parking air conditioner and the refrigerator are refrigerated, so that the refrigerator can normally run when the vehicle runs and parks.
Specifically, as shown in fig. 5 and 6, the reversing valve 4 includes a valve body 41 and a spool 42, the valve body 41 is provided with a cavity, the spool 42 is located in the cavity, and the spool 42 can rotate relative to the valve body 41. The first delivery pipe 15, the first return pipe 16, the second delivery pipe 25, the second return pipe 26, the first pipe 31 and the second pipe 32 are all connected to the valve body 41 and communicate with the chamber. The spool 42 is provided with a first passage 421 and a second passage 422. As the spool 42 rotates relative to the valve body 41, the spool 42 has a first valve position and a second valve position. When the valve core 42 is in the first valve position, the first passage 421 communicates with the first pipe 31 and the first delivery pipe 15, and the second passage 422 communicates with the second pipe 32 and the first return pipe 16, so that the first evaporator 3 communicates with the first compressor 11; when the valve spool 42 is in the second valve position, the second passage 422 communicates with the first pipe 31 and the second delivery pipe 25, and the first passage 421 communicates with the second pipe 32 and the second return pipe 26, so that the first evaporator 3 communicates with the second compressor 21.
It should be noted that, in the embodiment of the present invention, the structure of the reversing valve 4 is not specifically limited to the present invention, and in other embodiments, the reversing valve 4 may be set to a hydraulic valve set to switch so that the first compressor 11 or the second compressor 21 communicates with the first evaporator 3 by a person skilled in the art without departing from the principles of the present invention.
The first, second and third valves 33, 17 and 27, which can control the opening degrees, are respectively provided at the inlets of the first, second and third evaporators 3, 14 and 24, and whether the refrigerant flows through the first, second and third evaporators 3, 14 and 24 and the flow rate of the refrigerant flowing through the first, second and third evaporators 3, 14 and 24 can be controlled by controlling the opening degrees of the corresponding valves.
In summary, the working principle of the air conditioning system provided by the invention is as follows:
when the vehicle is started, the reversing valve 4 is switched to communicate the first evaporator 3 with the first compressor 11. Simultaneously, the engine rotates and drives the first compressor 11 to work, the first compressor 11 can compress low-temperature low-pressure gaseous refrigerant into high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into medium-temperature medium-pressure liquid refrigerant through the first condenser 12, heat is released to the outside, after the liquid refrigerant enters the first expansion valve 13 to be throttled, one part of the refrigerant absorbs heat through the second evaporator 14, the other part of the refrigerant absorbs heat through the first evaporator 3, the liquid refrigerant is evaporated to form a gaseous state, and then the gaseous refrigerant enters the first compressor 11 to be compressed and pressurized, and the reciprocating cycle is used for refrigerating the vehicle-mounted air conditioner and the refrigerator.
When the vehicle is parked, the reversing valve 4 is switched to communicate the first evaporator 3 with the second compressor 21. The battery of the vehicle provides energy for the second compressor 21, the second compressor 21 can compress the low-temperature low-pressure gaseous refrigerant into the high-temperature high-pressure gaseous refrigerant, the high-temperature high-pressure gaseous refrigerant is liquefied into the medium-temperature medium-pressure liquid refrigerant through the second condenser 22, heat is released to the outside, after the liquid refrigerant enters the second expansion valve 23 to be throttled, a part of the liquid refrigerant absorbs heat through the third evaporator 24, the liquid refrigerant is evaporated to form a gaseous state, and then the gaseous refrigerant enters the second compressor 21 to be compressed and pressurized, and the reciprocating cycle is used for refrigerating the parking air conditioner and the refrigerator.
As shown in fig. 7, the control method of the air conditioning system provided by the embodiment of the invention specifically includes the following steps:
s1, acquiring the rotating speed of an engine.
S2, judging whether the rotating speed of the engine is lower than a preset value. If the rotation speed of the engine is lower than the preset value, executing step S3; if the rotation speed of the engine is not lower than the preset value, step S4 is executed.
S3, starting the second compressor 21, and switching the reversing valve 4 to enable the first evaporator 3 to be communicated with the second compressor 21. At this time, the second compressor 21 performs work, and the refrigerant flows through the first evaporator 3 and the third evaporator 24, thereby refrigerating the refrigerator and the parking air conditioner.
S4, starting the first compressor 11, and switching the reversing valve 4 to enable the first evaporator 3 to be communicated with the first compressor 11. At this time, the first compressor 11 performs work, and the refrigerant flows through the first evaporator 3 and the second evaporator 14, thereby refrigerating the refrigerator and the vehicle-mounted air conditioner.
S5, acquiring the opening and closing states of the refrigerator, the vehicle-mounted air conditioner and the parking air conditioner, and executing the step S6 and the step S7.
S6, judging whether the refrigerator is opened or not. If the refrigerator is in an open state, opening the first valve 33 and executing step S8; if the refrigerator is in a closed state, the first valve 33 is closed, i.e., the opening degree is zero.
S7, judging whether the vehicle-mounted air conditioner or the parking air conditioner is started. If the vehicle-mounted air conditioner or the parking air conditioner is in an opened state, opening the second valve 17 or the third valve 27, and executing step S9; if the vehicle air conditioner or the parking air conditioner is in a closed state, the second valve 17 or the third valve 27 is closed, i.e. the opening degree is zero.
S8, acquiring the actual temperature inside the refrigerator and the preset temperature of the refrigerator.
S81, the opening degree of the first valve 33 is obtained according to the difference value between the actual temperature inside the refrigerator and the preset temperature of the refrigerator.
S9, acquiring the actual temperature in the vehicle cabin and the preset temperature of the vehicle cabin.
And S10, acquiring the opening of the second valve 17 or the third valve 27 according to the difference between the actual temperature in the vehicle cabin and the preset temperature of the vehicle cabin.
S11, calculating the calculated opening of all valves. Specifically, at the time of engine start, the calculated opening degrees of all the valves are equal to the sum of the calculated opening degrees of the first valve 33 and the second valve 17; the calculated opening degrees of all the valves are equal to the sum of the calculated opening degrees of the first valve 33 and the third valve 27 when the vehicle is stationary.
And S12, judging whether the calculated opening degrees of all the valves are larger than a first preset opening degree. If the calculated opening degrees of all the valves are larger than the first preset opening degree, executing the step S13; if the calculated opening degrees of all the valves are not greater than the first preset opening degree, step S14 is executed.
S13, the compressor operates at a first frequency. When the engine is started, the compressor is a first compressor; the compressor is a second compressor when the vehicle is stationary.
S14, judging whether the calculated opening degrees of all the valves are smaller than a second preset opening degree. If the calculated opening degrees of all the valves are smaller than the second preset opening degree, executing the step S15; if the calculated opening degrees of all the valves are not smaller than the second preset opening degree, step S16 is executed.
S15, the compressor operates at a third frequency. When the engine is started, the compressor is a first compressor; the compressor is a second compressor when the vehicle is stationary.
S16, the compressor operates at a second frequency. When the engine is started, the compressor is a first compressor; the compressor is a second compressor when the vehicle is stationary.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.

Claims (10)

1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor and at least two pieces of equipment, wherein the compressor can convey a refrigerant to the equipment through a refrigerant pipeline to refrigerate or heat, and valves capable of adjusting opening degrees are arranged on the refrigerant pipelines in the equipment;
the control method of the air conditioning system comprises the following steps:
acquiring the actual temperature and the preset temperature of all the running devices;
adjusting the opening of the corresponding valve according to the actual temperature and the preset temperature of the equipment;
and determining the operation frequency of the compressor according to the opening degrees of all the valves.
2. The control method of an air conditioning system according to claim 1, wherein "adjusting the opening of the corresponding valve according to the actual temperature and the preset temperature of the device" includes:
calculating and obtaining a difference value between the actual temperature and the preset temperature of each device;
and adjusting the opening of the corresponding valve according to the difference value between the actual temperature and the preset temperature of the equipment.
3. The control method of an air conditioning system according to claim 1, wherein "determining the operating frequency of the compressor according to the opening degrees of all the valves" includes:
obtaining a pipeline coefficient K of each device;
acquiring the opening SZ of a valve corresponding to each device;
calculating to obtain calculated opening degrees of all the valves, wherein the calculated opening degrees of all the valves areWherein x is the total number of said devices carried by said compressor;
and adjusting the operation frequency of the compressor according to the calculated opening degrees of all the valves.
4. A control method of an air conditioning system according to claim 3, wherein "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" includes:
and if the calculated opening degrees of all the valves are larger than a first preset opening degree, the compressor operates at a first frequency.
5. The control method of an air conditioning system according to claim 3, wherein "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" further comprises:
and if the calculated opening degrees of all the valves are smaller than the second preset opening degree, the compressor operates at a third frequency.
6. The control method of an air conditioning system according to claim 3, wherein "adjusting the operating frequency of the compressor according to the calculated opening degrees of all the valves" further comprises:
and if the calculated opening degrees of all the valves are larger than the second preset opening degree and smaller than the first preset opening degree, the compressor operates at the second frequency.
7. The control method of an air conditioning system according to claim 1, wherein the air conditioning system is applied to a vehicle, the compressor includes a first compressor driven using an engine of the vehicle and a second compressor driven using a battery of the vehicle;
the air conditioning system further comprises a reversing valve, wherein the reversing valve is connected with the first compressor and the second compressor through pipelines, at least one device is shared equipment, and switching the reversing valve can enable the first compressor or the second compressor to convey a refrigerant to the shared equipment;
the control method of the air conditioning system further comprises the following steps:
acquiring the rotating speed of the engine;
and controlling the first compressor or the second compressor to work according to the rotating speed of the engine, and switching the reversing valve to enable one of the first compressor and the second compressor to be in a working state to convey the refrigerant to the common equipment.
8. The control method of an air conditioning system according to claim 7, wherein "controlling the operation of the first compressor or the second compressor according to the rotational speed of the engine, and switching the reversing valve so that one of the first compressor and the second compressor is in an operating state delivers refrigerant to the common device" includes:
if the engine speed is not lower than a preset value, a first compressor is started, and the reversing valve is switched, so that the first compressor conveys a refrigerant to the common equipment; and/or
And if the engine rotating speed is lower than a preset value, starting a second compressor, and switching the reversing valve to enable the second compressor to convey the refrigerant to the common equipment.
9. The control method of an air conditioning system according to claim 1, characterized in that the control method of an air conditioning system further comprises:
acquiring the opening and closing state of each device;
and determining whether to open the corresponding valve according to the opening and closing state of each device.
10. The control method of an air conditioning system according to claim 9, wherein determining whether to open the corresponding valve according to the open/close state of each of the devices includes:
if the equipment is in a closed state, closing the corresponding valve; and/or the number of the groups of groups,
and if the equipment is in an opening state, opening the corresponding valve.
CN202310855475.8A 2023-07-12 2023-07-12 Control method of air conditioning system Pending CN117067864A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310855475.8A CN117067864A (en) 2023-07-12 2023-07-12 Control method of air conditioning system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310855475.8A CN117067864A (en) 2023-07-12 2023-07-12 Control method of air conditioning system

Publications (1)

Publication Number Publication Date
CN117067864A true CN117067864A (en) 2023-11-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310855475.8A Pending CN117067864A (en) 2023-07-12 2023-07-12 Control method of air conditioning system

Country Status (1)

Country Link
CN (1) CN117067864A (en)

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