CN111829148A - Control method for preventing refrigerant migration after shutdown, processor, air conditioner and air source heat pump system - Google Patents

Control method for preventing refrigerant migration after shutdown, processor, air conditioner and air source heat pump system Download PDF

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Publication number
CN111829148A
CN111829148A CN202010621059.8A CN202010621059A CN111829148A CN 111829148 A CN111829148 A CN 111829148A CN 202010621059 A CN202010621059 A CN 202010621059A CN 111829148 A CN111829148 A CN 111829148A
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China
Prior art keywords
compressor
refrigerant
temperature
control method
source heat
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Pending
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CN202010621059.8A
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Chinese (zh)
Inventor
叶方明
张树前
袁晓军
李浪
樊江威
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Zhejiang Zhongguang Electric Appliances Co Ltd
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Zhejiang Zhongguang Electric Appliances Co Ltd
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Priority to CN202010621059.8A priority Critical patent/CN111829148A/en
Publication of CN111829148A publication Critical patent/CN111829148A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/16—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/28—Means for preventing liquid refrigerant entering into the compressor

Abstract

The invention provides a control method for preventing refrigerant migration after shutdown, a processor, an air conditioner and an air source heat pump system, and belongs to the technical field of heat exchange systems. The problem that influence on a compressor is caused by refrigerant migration in the prior art is solved. The control method for preventing the refrigerant from migrating after the shutdown is used for the air source heat exchange system, the operation of the control method is started when the compressor still normally operates after the air source heat exchange system reaches the set target temperature, and the control method comprises the following steps: in a state where the compressor is in operation, etc. The control method for preventing the refrigerant from migrating after the shutdown, the processor, the air conditioner and the air source heat pump system have the advantages that: through the combined control of the throttle valve and the backflow preventing piece, most of refrigerant is stored in the condenser when the air conditioner or the air source heat pump system is stopped at a temperature, so that the refrigerant is prevented from migrating to the compressor when the compressor is stopped.

Description

Control method for preventing refrigerant migration after shutdown, processor, air conditioner and air source heat pump system
Technical Field
The invention belongs to the technical field of air source heat exchange systems, and particularly relates to a control method for preventing refrigerant migration after shutdown, a processor and an air source water heater.
Background
In the air source heat exchange system, after the system reaches the set temperature, generally will be in the shutdown state, along with the increase of downtime, the compressor temperature in the system can reduce gradually, until the same with ambient temperature, if the pressure of the refrigerant that is located in the system condenser side is higher than the pressure of the refrigerant of compressor side at this moment, will take place the refrigerant and move from condenser side to compressor side, this will lead to the following problem when the compressor starts next time:
1. the start with liquid brings disadvantages to the reliability of the compressor.
2. When the compressor is started with liquid, the temperature of the shell of the compressor slowly rises, the oil temperature of the compressor is low, and the lubricating performance of the compressor is reduced.
Disclosure of Invention
A first object of the present invention is to provide a control method for preventing migration of refrigerant after shutdown, which solves at least some of the above problems.
It is a second object of the invention to provide a processor for performing the above processing method.
A third object of the present invention is to provide an air conditioner including the above processor.
A fourth object of the invention is to provide an air-source heat pump system comprising the above processor.
In order to achieve the purpose, the invention adopts the following technical scheme: the invention discloses a control method for preventing refrigerant migration after shutdown, which is used for an air source heat exchange system and is characterized in that the operation of the control method is started when a compressor still normally operates after the air source heat exchange system reaches a set target temperature, and the control method comprises the following steps:
closing the throttle valve in a state where the compressor is in operation;
judging whether the condition of stopping the operation of the compressor is met, and if the condition is met, stopping the operation of the compressor;
judging whether the current temperature of the air source heat exchange system deviates from a set target temperature and whether the compressor stops running, if so, opening a control valve on a refrigerant pipe connected between an air suction port and an air exhaust port of the compressor, simultaneously enabling a throttle valve to run to a set opening degree, and closing the control valve after the compressor is started until the air source heat exchange system reaches the set target temperature;
the above steps are repeated.
In the control method for preventing the refrigerant from migrating after the shutdown, after the control valve and the throttle valve are opened, the compressor is opened again after waiting for the preset delayed starting time of the compressor.
In the above control method for preventing refrigerant migration after shutdown, when the compressor is in an operating state, the compressor still operates at the current fixed frequency when the compressor is a fixed-frequency compressor, and when the compressor is an inverter compressor, the operating frequency of the compressor needs to be decreased from the current high operating frequency to the set low operating frequency.
In the control method for preventing the refrigerant from migrating after the shutdown, in the step, whether the current temperature of the air source heat exchange system deviates from the set target temperature and whether the compressor stops running is judged, and when the compressor is an inverter compressor, the running frequency of the compressor during the starting is started according to the set low running frequency.
In the control method for preventing the refrigerant from migrating after the shutdown, if the compressor is an inverter compressor, in the step of judging whether the condition of stopping the operation of the compressor is met, if the condition of stopping the operation of the compressor is met, the electromagnetic valve is powered on and opened for the set electromagnetic valve opening time, and then the power is cut off.
In the control method for preventing the refrigerant from migrating after the shutdown, the conditions for stopping the operation of the compressor comprise the following conditions:
the temperature of a refrigerant on a refrigerant inlet side of an evaporator on a system under the first condition is lower than a preset first refrigerant temperature threshold value when a compressor stops;
the temperature of a refrigerant which is arranged on a system and is positioned on the exhaust port side of the compressor under the second condition is larger than a preset second refrigerant temperature threshold value when the compressor stops;
the third condition is that whether the time for which the opening of the throttle valve is kept at 0pls reaches a preset threshold value of the continuous closing time of the throttle valve when the compressor is stopped;
when any one of the above-described conditions for stopping the operation of the compressor is satisfied, the operation of the compressor is stopped.
In the control method for preventing the refrigerant from migrating after the shutdown, in the process of judging whether the current temperature of the air source heat exchange system deviates from the set target temperature, whether the deviation value of the current temperature of the air source heat exchange system deviating from the set target temperature reaches the deviation threshold value of the set target temperature needs to be judged, and the control valve, the throttle valve and the compressor can be opened only if the two conditions are met simultaneously.
The processor is configured to execute a program, wherein the program executes to perform the steps of the control method.
The air conditioner comprises a compressor, a first heat exchanger, a throttle valve, a second heat exchanger, a processor and a memory which are sequentially connected through a refrigerant pipe, and is characterized by further comprising a temperature sensor which is arranged adjacent to the refrigerant inlet side of one of the two heat exchangers and is used as an evaporator, an anti-backflow piece which is arranged on the refrigerant pipe connected with the exhaust side of the compressor and is used for preventing the refrigerant from flowing into the exhaust port of the compressor in a backflow mode, and a detector which is used for directly or indirectly detecting the temperature of the refrigerant on the exhaust side of the compressor, wherein the processor is the processor.
The air source heat pump system comprises a compressor, a first heat exchanger, a throttle valve, a second heat exchanger, a processor and a memory which are sequentially connected through a refrigerant pipe, and is characterized by further comprising a temperature sensor, an anti-backflow piece and a detector, wherein the temperature sensor is arranged adjacent to the refrigerant inlet side of one of the two heat exchangers serving as an evaporator, the anti-backflow piece is arranged on the refrigerant pipe connected with the exhaust side of the compressor and used for preventing the refrigerant from flowing back into the exhaust port of the compressor, the detector is used for directly or indirectly detecting the temperature of the refrigerant on the exhaust side of the compressor, and the processor is the processor.
Compared with the prior art, the control method for preventing the refrigerant from migrating after the shutdown, the processor, the air conditioner and the air source heat pump system have the advantages that: through the combined control of the throttle valve and the backflow prevention piece, most of refrigerants are stored in the condenser when the air conditioner or the air source heat pump system is stopped at a temperature, so that the refrigerants are prevented from migrating to the compressor when the compressor is stopped, liquid refrigerants cannot be gathered at the suction side of the compressor when the compressor is started, the compressor is protected, and meanwhile, the lubricating performance of the compressor can be guaranteed when the oil temperature of the compressor is quickly increased to the required oil temperature.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 provides a schematic diagram of the operation of an air-source heat pump water heater embodiment of the present invention in a heating mode.
Figure 2 provides a schematic diagram of the operation of an air source heat pump water heater embodiment of the present invention in a cooling mode.
In the figure, a compressor 101, a first heat exchanger 102, an electromagnetic expansion valve 103, a second heat exchanger 104, a four-way valve 105, a water tank 106, a first refrigerant temperature sensor 107, a second refrigerant temperature sensor 108, a high pressure sensor 109, a check valve 110, a water temperature sensor 111, and an electromagnetic valve 112.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
It should be noted that the air source heat exchange system generally includes an air conditioner and an air source heat pump system, and the air conditioner and the air source heat pump system generally include a compressor, a first heat exchanger, a throttle valve, and a second heat exchanger that are sequentially connected by a refrigerant pipe, and if both of the above two have a cooling function and a heating function, the air source heat pump system also generally includes a four-way valve, and in addition, the air source heat pump system has a function of heating water (when the air source heat pump system only has a function of heating water, it is generally called as an air source heat pump water heater).
The throttle valve is usually an electronic expansion valve, but may be another device component if necessary.
In addition, a control valve is arranged on a refrigerant pipe connecting the exhaust port side and the suction port side of the compressor.
The control valve is generally referred to herein as an electromagnetic valve, but may be another device component if desired.
In addition, in order to dynamically know the working parameters of the key parts in the air conditioner or the air source heat pump system, various sensors (such as a temperature sensor for detecting temperature and a pressure sensor for detecting pressure) need to be arranged.
In addition, the air conditioner and the air source heat pump system in the scheme are different from the existing air conditioner and the existing air source heat pump system in part: the device also comprises a backflow preventing part which is arranged on a refrigerant pipe connected with the exhaust side of the compressor and is used for preventing the refrigerant from flowing into the exhaust port of the compressor in a backflow manner, and a detector which is used for directly or indirectly detecting the temperature of the refrigerant at the exhaust side of the compressor.
The backflow preventer is usually a check valve, but may be a single unit or a combination of a plurality of units that prevent the refrigerant from flowing backward into the compressor discharge port, if necessary.
The detector may be a temperature sensor capable of directly detecting the temperature of the high-temperature gaseous refrigerant at the exhaust side of the compressor, or may be another type of sensor for indirectly detecting the temperature of the high-temperature gaseous refrigerant at the exhaust side of the compressor, such as a high-pressure sensor, that is, the pressure of the high-pressure sensor is detected by the high-pressure sensor, then the temperature of the high-temperature gaseous refrigerant is found in a refrigerant pressure and temperature comparison table in combination with the type of the refrigerant, and the refrigerant pressure and temperature comparison table is usually stored in a memory of a computer as electronic data, so that the temperature value corresponding to the pressure value detected by the high-pressure sensor is automatically obtained after the pressure value is obtained.
Fig. 1 and 2 show the working principle of the air source heat pump water heater containing the scheme when the air source heat pump water heater is in a heating mode and a cooling mode.
In addition, the processor provided in the air conditioner or the air source heat pump system in the present embodiment also has a portion different from the existing air conditioner or the air source heat pump system, that is, the processor has a capability of executing the following control method for preventing the migration of the refrigerant after the shutdown.
The control method for preventing the refrigerant from migrating after the shutdown starts from the operation of the compressor after the air source heat exchange system reaches the set target temperature.
When the compressor is a fixed-frequency compressor, the control method for preventing the refrigerant from migrating after the shutdown comprises the following steps.
Step 110, the compressor is still running at a fixed frequency and the throttle is closed.
And step 120, judging whether the condition for stopping the operation of the compressor is met, and if the condition is met, stopping the operation of the compressor.
Specifically, the condition for stopping the operation of the compressor includes the following conditions.
The first condition is that the temperature of the refrigerant on the refrigerant inlet side of the evaporator on the system is less than a preset first refrigerant temperature threshold when the compressor is stopped.
And the temperature of the refrigerant on the exhaust port side of the compressor on the system under the second condition is greater than a preset second refrigerant temperature threshold value when the compressor is stopped.
And a third condition is whether the time for which the opening of the throttle valve is kept at 0pls reaches a preset threshold value of the time for which the throttle valve is kept closed when the compressor is stopped.
When any one of the above-described conditions for stopping the operation of the compressor is satisfied, the operation of the compressor is stopped.
And step 130, judging whether the current temperature of the air source heat exchange system deviates from the set target temperature and whether the compressor stops running, if so, opening a control valve connected to a refrigerant pipe between an air suction port and an air exhaust port of the compressor, simultaneously enabling a throttle valve to run to a set opening degree, and closing the control valve after the compressor is started until the air source heat exchange system reaches the set target temperature.
In order to prevent the compressor from being started frequently, after the control valve and the throttle valve are opened, the compressor is started again after waiting for the preset delayed starting time of the compressor.
Preferably, in order to prevent frequent start-up of the control valve, the throttle valve and the compressor, in the process of determining whether the current temperature of the air source heat exchange system deviates from the set target temperature, it is also determined whether the deviation value of the current temperature of the air source heat exchange system from the set target temperature reaches the deviation threshold value of the set target temperature, and the control valve, the throttle valve and the compressor can be started only if the above two conditions are simultaneously satisfied, as in the following operation step 230 when the compressor is an inverter compressor.
In addition, in the heating mode, the deviation value is a negative value, whether the current temperature of the air source heat exchange system is lower than (the set target temperature-the deviation threshold value of the set target temperature) or not is judged, and the control valve, the throttle valve and the compressor are opened only if the condition is met; in the cooling mode, the deviation value is a positive value, and if the current temperature of the air source heat exchange system is higher than (the set target temperature + the deviation threshold of the set target temperature) or not, the control valve, the throttle valve and the compressor are opened only if the condition is met, as is the operation step 230 when the compressor is an inverter compressor.
And step 140, repeating the steps.
When the compressor is a variable frequency compressor, the control method for preventing the refrigerant from migrating after the shutdown comprises the following steps.
Step 210, the compressor is operated at a current high operating frequency down to a set low operating frequency, and the throttle is closed.
The purpose of operating the compressor at a low operating frequency is that the high-pressure refrigerant generated during the high-frequency operation of the compressor is flushed too fast to completely collect the refrigerant.
And step 220, judging whether the condition of stopping the operation of the compressor is met, if so, stopping the operation of the compressor, and powering down the electromagnetic valve after the electromagnetic valve is electrified and opened for the set electromagnetic valve opening time.
Specifically, the condition for stopping the operation of the compressor includes the following conditions.
The first condition is that the temperature of the refrigerant on the refrigerant inlet side of the evaporator on the system is less than a preset first refrigerant temperature threshold when the compressor is stopped.
And the temperature of the refrigerant on the exhaust port side of the compressor on the system under the second condition is greater than a preset second refrigerant temperature threshold value when the compressor is stopped.
And a third condition is whether the time for which the opening of the throttle valve is kept at 0pls reaches a preset threshold value of the time for which the throttle valve is kept closed when the compressor is stopped.
When any one of the above-described conditions for stopping the operation of the compressor is satisfied, the operation of the compressor is stopped.
And step 230, judging whether the current temperature of the air source heat exchange system deviates from the set target temperature and whether the compressor stops running, if so, opening a control valve on a refrigerant pipe connected between a suction port and an exhaust port of the compressor, and simultaneously enabling the throttle valve to run to a set opening degree, starting the compressor according to a set low running frequency, and closing the control valve after the compressor is started until the air source heat exchange system reaches the set target temperature.
In order to prevent the compressor from being started frequently, after the control valve and the throttle valve are opened, the compressor is started again after waiting for the preset delayed starting time of the compressor.
And step 240, repeating the steps.
A specific example of the above listed steps of the method when the air source heat pump water heater as shown in fig. 1 is in heating mode is given below, which is for explanation of the invention and the invention is not limited to the following.
When the compressor is a fixed-frequency compressor, the method comprises the following operation steps.
In step 11, the compressor 101 continues to operate, and the electronic expansion valve 103 is closed to 0pls from the current opening degree.
In step 12, when any of the following three conditions is satisfied, the compressor 101 is stopped, and the electronic expansion valve 103 is maintained at 0 pls.
Condition 1, the temperature of the refrigerant on the refrigerant inlet side of the evaporator is less than-15 ℃.
As shown in fig. 1, in the heating mode, the evaporator here is the first heat exchanger 102, and the temperature of the refrigerant on the refrigerant inlet side of the evaporator here is measured by the first refrigerant temperature sensor 107, as shown in fig. 2, in the cooling mode, the evaporator here is the second heat exchanger 104, and the temperature of the refrigerant on the refrigerant inlet side of the evaporator here is measured by the second refrigerant temperature sensor 108, as well as condition 1 in operation step 22 when the compressor 101 is an inverter compressor described below.
In condition 2, the temperature of the refrigerant on the discharge port side of the compressor 101 is greater than 70 ℃.
It should be noted that, as shown in fig. 1, the detection of the temperature of the refrigerant is indirect, that is, the pressure of the refrigerant is first measured by the high-pressure sensor 109, and then the temperature of the refrigerant is found by the refrigerant pressure and temperature comparison table in the storage system, as well as the condition 2 in the operation step 22 when the compressor 101 is an inverter compressor, which will be described below.
In condition 3, the duration of the electronic expansion valve 103 to 0pls reaches 2 min.
And step 13, when the water temperature of the water heater is reduced and the machine is required to be started, the control method comprises the following steps of firstly opening the electromagnetic valve 112 and simultaneously opening the electronic expansion valve 103 to a specified opening degree, starting the compressor 101 after 15s, and closing the electromagnetic valve 112 after the compressor 101 is started.
As shown in fig. 1 and 2, the water temperature of the water heater is measured by the water temperature sensor 111, and the same applies to the operation step 23 when the compressor 101 is an inverter compressor, which will be described below.
Preferably, the machine is turned on only when the water heater temperature drops to (the set target temperature-5 ℃), as is the operation step 23 when the compressor 101 is an inverter compressor, described below.
When the compressor 101 is an inverter compressor, the method operates as follows.
In step 21, the compressor 101 continues to operate from the current frequency to 30HZ, and the electronic expansion valve 103 is closed to 0pls from the current opening degree.
And 22, when any one of the following three conditions is met, stopping the compressor 101, keeping the electronic expansion valve 103 at 0pls, and powering down the electromagnetic valve after the electromagnetic valve is electrified and opened for 30 s.
Condition 1, the temperature of the refrigerant on the refrigerant inlet side of the evaporator is less than-15 ℃.
In condition 2, the temperature of the refrigerant on the discharge port side of the compressor 101 is greater than 70 ℃.
In condition 3, the duration of the electronic expansion valve 103 to 0pls reaches 2 min.
And step 23, when the water temperature of the water heater is reduced and the machine is required to be started, the control method comprises the following steps of firstly opening the electromagnetic valve 112 and simultaneously opening the electronic expansion valve 103 to a specified opening degree, starting the compressor 101 at 30Hz after 15s, and closing the electromagnetic valve 112 after the compressor 101 is started.
The following is the detection and comparison of the compressor exhaust temperature and the lubricating oil temperature in the heat pump water heater system without the refrigerant migration control scheme and adopting the refrigerant migration control scheme.
The refrigerant migration is divided into two stages.
Stage 1: when the temperature in the water tank just reaches the set target temperature, namely 55 ℃, the system is shut down, the refrigerant in the condenser performing heat exchange with the water tank of the internal unit is in a high-pressure state at the moment, the refrigerant on the suction side of the compressor is in a low-pressure state, and part of the refrigerant in the condenser flows to the suction side of the compressor in the pressure balancing process.
And (2) stage: because the temperature in the water tank is 55 ℃ and the ambient temperature of the compressor is usually lower than 55 ℃, the temperature of the refrigerant in the condenser exchanging heat with the water tank is higher than that of the refrigerant at the compressor side because the water temperature in the water tank is higher than the ambient temperature, and the temperature of the refrigerant at the suction side of the compressor is lower and lower to be basically the same as the ambient temperature along with the increase of time, so that the refrigerant in the condenser exchanging heat with the water tank slowly migrates to the compressor side because of the high pressure.
Oil temperature and exhaust comparison by refrigerant migration prevention scheme
Taking the environment temperature of 20 ℃ as an example, the machine is stopped for 3 hours, and when the water tank temperature is started at 50 ℃ (namely the water temperature in the water tank is reduced by 5 ℃), the oil temperature and the exhaust temperature of the compressor are detected.
And the oil temperature and the exhaust temperature of the compressor of the refrigerant migration-free control scheme are detected by a data table.
Time of day 0 minute 5 minutes 10 minutes 15 minutes
Exhaust temperature 27℃ 74℃ 84℃ 83℃
Oil temperature 32℃ 42℃ 57.8℃ 57.6℃
There is oil temperature and exhaust temperature detection data table of the compressor of the refrigerant migration control scheme.
Time of day 0 minute 3 minutes 7 minutes 10 minutes
Exhaust temperature 27℃ 77℃ 85℃ 84℃
Oil temperature 32℃ 48℃ 58℃ 58℃
From the above case, it can be known that, after the refrigerant migration scheme is adopted, the oil temperature of the compressor basically reaches the highest value in 7 th minute, and reaches 3 minutes earlier than the oil temperature of the compressor without the refrigerant migration scheme.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Although the compressor 101, the first heat exchanger 102, the electronic expansion valve 103, the second heat exchanger 104, the four-way valve 105, the water tank 106, the first refrigerant temperature sensor 107, the second refrigerant temperature sensor 108, the high pressure sensor 109, the check valve 110, the water temperature sensor 111, and the solenoid valve 112 are more used herein.
Etc., but does not exclude the possibility of using other terms. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed as being without limitation to any additional limitations that may be imposed by the spirit of the present invention.

Claims (10)

1. A control method for preventing refrigerant migration after shutdown is used for an air source heat exchange system, and is characterized in that the control method starts when a compressor still normally operates after the air source heat exchange system reaches a set target temperature, and the control method comprises the following steps:
closing the throttle valve in a state where the compressor is in operation;
judging whether the condition of stopping the operation of the compressor is met, and if the condition is met, stopping the operation of the compressor;
judging whether the current temperature of the air source heat exchange system deviates from a set target temperature and whether the compressor stops running, if so, opening a control valve on a refrigerant pipe connected between an air suction port and an air exhaust port of the compressor, simultaneously enabling a throttle valve to run to a set opening degree, and closing the control valve after the compressor is started until the air source heat exchange system reaches the set target temperature;
the above steps are repeated.
2. The control method for preventing refrigerant migration after shutdown as claimed in claim 1, wherein after the control valve and the throttle valve are opened, the compressor is turned on again after waiting for a preset delayed compressor start-up time.
3. The control method for preventing refrigerant migration after shutdown as claimed in any one of claims 1 to 2, wherein in the operating state of the compressor, when the compressor is a fixed frequency compressor, the compressor still operates at the current fixed frequency, and when the compressor is an inverter compressor, the operating frequency of the compressor needs to be decreased from the current high operating frequency to the set low operating frequency.
4. The control method for preventing refrigerant migration after shutdown as claimed in any one of claims 1 to 2, wherein in the step of determining whether the current temperature of the air source heat exchange system deviates from the set target temperature and whether the compressor has stopped operating, when the compressor is an inverter compressor, the frequency of operation when the compressor is started according to the set low operation frequency.
5. The control method for preventing refrigerant migration after shutdown as claimed in any one of claims 1 to 2, wherein if the compressor is an inverter compressor, in the step of determining whether the condition for stopping the operation of the compressor is satisfied, if the condition for stopping the operation of the compressor is satisfied, the electromagnetic valve is powered on and opened for a set electromagnetic valve opening time, and then the power is cut off.
6. The control method for preventing refrigerant migration after shutdown as claimed in claim 1, wherein the compressor shutdown conditions include the following conditions:
the temperature of a refrigerant on a refrigerant inlet side of an evaporator on a system under the first condition is lower than a preset first refrigerant temperature threshold value when a compressor stops;
the temperature of a refrigerant which is arranged on a system and is positioned on the exhaust port side of the compressor under the second condition is larger than a preset second refrigerant temperature threshold value when the compressor stops;
the third condition is that whether the time for which the opening of the throttle valve is kept at 0pls reaches a preset threshold value of the continuous closing time of the throttle valve when the compressor is stopped;
when any one of the above-described conditions for stopping the operation of the compressor is satisfied, the operation of the compressor is stopped.
7. The control method for preventing refrigerant migration after shutdown as recited in claim 1, wherein in the process of determining whether the current temperature of the air source heat exchange system deviates from the set target temperature, it is further determined whether a deviation value of the current temperature of the air source heat exchange system deviating from the set target temperature reaches a deviation threshold value of the set target temperature, and the control valve, the throttle valve and the compressor can be opened only if the two conditions are satisfied simultaneously.
8. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the steps in the control method of any one of claims 1 to 7.
9. An air conditioner comprises a compressor, a first heat exchanger, a throttle valve, a second heat exchanger, a processor and a memory which are sequentially connected through a refrigerant pipe, and is characterized by further comprising a temperature sensor which is arranged adjacent to the refrigerant inlet side of one of the two heat exchangers and is used as an evaporator, an anti-backflow piece which is arranged on the refrigerant pipe connected with the exhaust side of the compressor and is used for preventing the refrigerant from flowing into the exhaust port of the compressor in a backflow mode, and a detector which is used for directly or indirectly detecting the temperature of the refrigerant on the exhaust side of the compressor, wherein the processor is the processor in claim 8.
10. An air source heat pump system comprises a compressor, a first heat exchanger, a throttle valve, a second heat exchanger, a processor and a memory which are sequentially connected through a refrigerant pipe, and is characterized by further comprising a temperature sensor, an anti-backflow piece and a detector, wherein the temperature sensor is arranged on the refrigerant inlet side of one of the two heat exchangers and is used as an evaporator, the anti-backflow piece is arranged on the refrigerant pipe connected with the exhaust side of the compressor and is used for preventing the refrigerant from flowing into the exhaust port of the compressor in a backflow mode, the detector is used for directly or indirectly detecting the temperature of the refrigerant on the exhaust side of the compressor, and the processor is the processor in claim 8.
CN202010621059.8A 2020-06-30 2020-06-30 Control method for preventing refrigerant migration after shutdown, processor, air conditioner and air source heat pump system Pending CN111829148A (en)

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