WO2023000828A1 - Procédé et appareil pour régler le degré de surchauffe d'échappement d'un dispositif de pompe à chaleur, et dispositif de pompe à chaleur - Google Patents

Procédé et appareil pour régler le degré de surchauffe d'échappement d'un dispositif de pompe à chaleur, et dispositif de pompe à chaleur Download PDF

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Publication number
WO2023000828A1
WO2023000828A1 PCT/CN2022/096115 CN2022096115W WO2023000828A1 WO 2023000828 A1 WO2023000828 A1 WO 2023000828A1 CN 2022096115 W CN2022096115 W CN 2022096115W WO 2023000828 A1 WO2023000828 A1 WO 2023000828A1
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WIPO (PCT)
Prior art keywords
refrigerant
heat pump
superheat
amount
degree
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PCT/CN2022/096115
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English (en)
Chinese (zh)
Inventor
张嘉诚
刘汇泉
刘峻杉
李旭
夏鹏
Original Assignee
青岛海尔空调电子有限公司
青岛海尔空调器有限总公司
海尔智家股份有限公司
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Publication of WO2023000828A1 publication Critical patent/WO2023000828A1/fr

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    • 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
    • F25B30/02—Heat pumps of the compression 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • 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

Definitions

  • the present application relates to the technical field of heat pump equipment, for example, to a method and device for adjusting the superheat degree of exhaust gas from the heat pump equipment, and the heat pump equipment.
  • the existing hot water machine system adds a liquid storage tank to solve the problem of different refrigerant volumes for heating and cooling.
  • the liquid storage tank generally uses the difference in density of the gas-liquid two-phase state of the refrigerant to separate the gas and liquid. Part of the liquid refrigerant is stored in the liquid tank to realize the adjustment of the amount of refrigerant in the water heater system.
  • the exhaust superheat of the compressor refers to the temperature difference between the compressor exhaust pipe and the saturation temperature corresponding to the current condensing pressure in the condenser. Too high or too low exhaust superheat will have an adverse effect on the water heater. In some In the prior art, if the exhaust superheat is too low, the refrigerant will be injected into the circulation system of the hot water machine from the liquid storage tank, and if the exhaust superheat is too high, the injection of refrigerant into the circulation system of the water heater will be stopped. Actively adjust the amount of refrigerant participating in the cycle, so as to maintain the exhaust superheat within a certain range.
  • the water heater in the heating mode needs less refrigerant, and the water heater in the cooling mode needs more refrigerant.
  • the water heater switches from the heating mode to the cooling mode, or from the cooling mode to the heating During the switching process of the mode, the aforementioned prior art cannot take into account both the amount of refrigerant and the degree of superheat of the exhaust gas.
  • Embodiments of the present disclosure provide a method, device and heat pump device for adjusting the exhaust superheat of heat pump equipment, so as to solve the technical problem that the prior art cannot take into account the amount of refrigerant and the exhaust superheat during operation mode switching.
  • the heat pump equipment includes a liquid storage device
  • the method for adjusting the exhaust superheat degree of the heat pump equipment includes: obtaining the exhaust superheat degree of the compressor of the heat pump equipment, and the operation mode of the heat pump equipment,
  • the operation mode includes a heating mode and a cooling mode; according to the operation mode and the exhaust superheat, the refrigerant storage speed or the refrigerant release speed of the liquid storage device is determined, and the refrigerant storage speed is related to the heating The mode corresponds, and the release rate of the refrigerant corresponds to the cooling mode; the flow control valve used to control the liquid storage device is adjusted to an opening corresponding to the storage rate of the refrigerant or the release rate of the refrigerant.
  • determining the refrigerant storage rate or refrigerant release rate of the liquid storage device includes: obtaining the current refrigerant amount of the liquid storage device; obtaining a set refrigerant amount A refrigerant amount difference from the current refrigerant amount; according to the refrigerant amount difference and the degree of superheat of the exhaust gas, determine the refrigerant storage rate or the refrigerant release rate of the liquid storage device.
  • determining the refrigerant storage rate or the refrigerant release rate of the liquid storage device according to the refrigerant amount difference and the exhaust superheat degree includes: obtaining the exhaust gas superheat corresponding to the The refrigerant storage speed or the refrigerant release speed; according to the refrigerant storage speed or the refrigerant release speed, obtain the estimated duration for the refrigerant amount difference to be zero; when the estimated duration is less than the set duration
  • re-determine the refrigerant storage rate or the refrigerant release rate so that the new estimated duration for the refrigerant amount difference to become zero is greater than or equal to The set duration.
  • obtaining the refrigerant storage rate or the refrigerant release rate corresponding to the exhaust superheat includes: in the heating mode, if the exhaust superheat is greater than a first set temperature , then determine that the refrigerant storage rate is the first storage rate; if the exhaust gas superheat is less than or equal to the second set temperature, then determine that the refrigerant storage rate is the second storage rate, wherein the first storage The speed is greater than the second storage speed; in the refrigeration mode, if the exhaust superheat is greater than the second set temperature, the refrigerant release rate is determined to be the first release rate; if the exhaust superheat If it is less than or equal to the second set temperature, then the refrigerant release rate is determined to be the second release rate, wherein the first release rate is smaller than the second release rate.
  • obtaining the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount includes: in the heating mode, determining the difference between the first set refrigerant amount and the current refrigerant amount as the refrigerant amount amount difference; in cooling mode, the difference between the current refrigerant amount and the second set refrigerant amount is determined as the refrigerant amount difference; wherein, the first set refrigerant amount is greater than the second set refrigerant amount Set the amount of refrigerant.
  • the method for adjusting the degree of superheat of the exhaust gas of the heat pump equipment further includes: when the refrigerant amount difference is less than or equal to the set refrigerant amount difference, increasing the refrigerant storage rate or the refrigerant release rate Determined to be zero.
  • the method for adjusting the degree of superheat of the heat pump device further includes: reducing the frequency of the compressor and/or increasing the frequency of the fan of the heat pump device when the degree of superheat of the exhaust gas is greater than a set temperature Rotational speed; when the degree of superheat of the exhaust gas is less than or a set temperature, increase the frequency of the compressor, and/or decrease the rotational speed of the fan of the heat pump device.
  • the apparatus for adjusting the exhaust superheat of the heat pump device includes: an obtaining module, a first determination module and a first control module, wherein the obtaining module is configured to obtain the exhaust gas of the compressor of the heat pump device degree of superheat, and the operation mode of the heat pump device, the operation mode includes a heating mode and a cooling mode; the first determining module is configured to determine the storage capacity according to the operation mode and the degree of superheat of the exhaust The refrigerant storage speed or refrigerant release speed of the liquid device, the refrigerant storage speed corresponds to the heating mode, and the refrigerant release speed corresponds to the cooling mode; the first control module is configured to use The flow control valve controlling the liquid storage device is adjusted to an opening corresponding to the refrigerant storage speed or refrigerant release speed.
  • the device for adjusting the exhaust superheat of heat pump equipment includes a processor and a memory storing program instructions, and the processor is configured to perform the functions provided by the foregoing embodiments when executing the program instructions A method for adjusting the exhaust superheat of heat pump equipment.
  • the heat pump equipment includes the device for adjusting the superheat degree of exhaust gas from the heat pump equipment provided in the foregoing embodiments.
  • the method, device, and heat pump equipment for adjusting the exhaust superheat of heat pump equipment provided by the embodiments of the present disclosure can achieve the following technical effects:
  • the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system.
  • the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed;
  • the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system.
  • the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant.
  • the circulation of the heat pump equipment can be improved.
  • the amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.
  • FIG. 1 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure
  • Fig. 2 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure
  • Fig. 3 is a schematic diagram of a method for adjusting the exhaust superheat of a heat pump device provided by an embodiment of the present disclosure
  • Fig. 4 is a schematic diagram of a device for adjusting the exhaust superheat of a heat pump device provided by an embodiment of the present disclosure
  • Fig. 5 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure.
  • A/B means: A or B.
  • a and/or B means: A or B, or, A and B, these three relationships.
  • the heat pump device in the embodiments of the present disclosure refers to a device composed of a compressor, a condenser, an evaporator, etc., and may be a water heater or an air conditioner.
  • Fig. 1 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure.
  • the circulation system of the heat pump equipment includes a compressor 11 , an internal heat exchanger 12 , an external heat exchanger 13 , a throttle valve 14 , a liquid storage device 15 , and valves A, B and C.
  • the compressor 11 is connected with the heat exchanger 12 of the internal machine
  • the compressor 11 is connected with the heat exchanger 13 of the external machine
  • the heat exchanger 13 of the external machine is connected with the throttle valve 14, and the throttle valve 14 is exchanged with the internal machine through the valve C.
  • Heater 12 is connected, the pipeline between throttle valve 14 and valve C is connected to one end of valve A, the other end of valve A extends to the inside of liquid storage device 15 through pipeline a, and the internal heat exchanger 12 and valve C
  • the pipeline in between is connected to one end of valve B, and the other end of valve B extends to the inside of the liquid storage device 15 through the pipeline b, and the port of the pipeline a inside the liquid storage device 15 is connected to that of the pipeline b in the liquid storage device 15 above the internal ports.
  • Valve A, valve B, and valve C form flow control valves for adjusting the amount of refrigerant inside the liquid storage device 15.
  • valve A and valve B are opened, and the refrigerant is stored by the circulation system of the heat pump equipment.
  • the valve C can be closed or have a certain opening; when the heat pump equipment is in cooling mode, valve A and valve B are opened, and the refrigerant is released from the liquid storage device 15 to the circulation system of the heat pump equipment , at this time the valve C can be closed or have a certain opening.
  • Fig. 2 is a schematic diagram of a circulation system of a heat pump device provided by an embodiment of the present disclosure.
  • the circulation system of the heat pump equipment includes a compressor 11 , an internal heat exchanger 12 , an external heat exchanger 13 , a throttle valve 14 , a liquid storage device 15 , and valves D and E.
  • the compressor 11 is connected with the internal heat exchanger 12
  • the compressor 11 is connected with the external heat exchanger 13
  • the external heat exchanger 13 is connected with the throttle valve 14
  • the throttle valve 14 is connected with the internal heat exchanger 12.
  • valve E the pipeline between the compressor 11 and the external unit heat exchanger 13 is connected to one end of the valve E, and the other end of the valve E extends to the inside of the liquid storage device 15 through the pipeline e, and the internal unit heat exchanger 12 is connected to the throttling
  • the pipeline between the valves 14 is connected to one end of the valve D, and the other end of the valve D extends to the inside of the liquid storage device 15 through the pipeline d, wherein the port of the pipeline e in the liquid storage device 15 is in the position of the pipeline d in the storage device. above the port in the liquid device 15.
  • Valve E and valve D constitute flow control valves for adjusting the amount of refrigerant inside the liquid storage device 15.
  • valve D and valve E When the heat pump equipment is in the heating mode, valve D and valve E are opened, and the refrigerant is stored in the liquid storage by the circulation system of the heat pump equipment.
  • Device 15 when the heat pump equipment is in cooling mode, the valve D and the valve E are opened, and the refrigerant is released from the liquid storage device 15 to the circulation system of the heat pump equipment.
  • the heat pump device When the heat pump device is in the heating mode, adjust the amount of refrigerant inside the liquid storage device 15 to the first set refrigerant amount L1, and then close the valve D and valve E;
  • the refrigerant amount inside the liquid device 15 is adjusted to the second set refrigerant amount L2, and then the valve D and the valve E are closed.
  • Fig. 3 is a schematic diagram of a method for adjusting the exhaust superheat degree of a heat pump device provided by an embodiment of the present disclosure.
  • the method for adjusting the superheat degree of exhaust gas from a heat pump device can be executed by a controller of the heat pump device.
  • the methods for adjusting the exhaust superheat of the equipment include:
  • the refrigerant of the heat pump system condenses and releases heat in the internal heat exchanger; when the heat pump equipment is in the cooling mode, the refrigerant of the heat pump system evaporates and absorbs heat in the internal heat exchanger.
  • the exhaust superheat of the compressor of the heat pump equipment refers to the temperature difference between the exhaust temperature of the compressor and the saturation temperature corresponding to the condensation pressure in the condenser. Obtain the exhaust temperature of the compressor and the condensation pressure in the condenser, then obtain the saturation temperature corresponding to the condensation pressure, and calculate the difference between the exhaust temperature and the saturation temperature to obtain the exhaust superheat.
  • the amount of refrigerant required by heat pump equipment for heating is usually lower than the amount of refrigerant required for cooling.
  • the above-mentioned refrigerant storage speed corresponds to the heating mode, which means that the heat pump equipment determines the refrigerant storage speed in the heating mode.
  • the circulation system of the heat pump equipment needs to store the refrigerant in the liquid storage device to reduce the amount of refrigerant in the circulation system of the heat pump equipment, and the aforementioned refrigerant storage speed is the cycle The speed at which the system stores refrigerant in the liquid storage device.
  • the heat pump device was running in the cooling mode last time, and it is running in the heating mode when it is turned on this time, that is, the heat pump device is switched from the cooling mode to the heating mode; or, the heat pump device running in the heating mode enters the cooling mode.
  • frost mode after the end of defrost mode, the heat pump equipment switches from cooling mode to heating mode.
  • the above refrigerant release speed corresponds to the cooling mode, which means that the heat pump equipment determines the refrigerant release speed in the cooling mode.
  • the heat pump equipment When the heat pump equipment is switched from the heating mode to the cooling mode, it needs to be circulated from the liquid storage device to the heat pump equipment.
  • the system releases the refrigerant to increase the amount of refrigerant in the circulation system of the heat pump equipment, and the aforementioned release speed of the refrigerant is the speed at which the liquid storage device releases the refrigerant to the circulation system.
  • the heat pump device was running in the heating mode last time, and it is running in the cooling mode when it is turned on this time, that is, the heat pump device switches from the heating mode to the cooling mode; or, the heat pump device running in the heating mode enters the Frost mode means that the heat pump equipment switches from heating mode to cooling mode.
  • the heat pump equipment After the heat pump equipment is switched from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode.
  • the circulation system stores the refrigerant in the liquid storage device, and the storage speed of the refrigerant can be increased, which can quickly reduce the pressure of the refrigerant in the system, which is beneficial to reduce Exhaust superheat; reducing the refrigerant storage speed can slowly reduce the refrigerant pressure in the system, which has the opposite effect on reducing the exhaust superheat and is conducive to maintaining or increasing the exhaust superheat. For example, increasing the frequency of the compressor at the same time can achieve Maintain or increase exhaust superheat.
  • the heat pump equipment After the heat pump equipment is switched from the heating mode to the cooling mode, the heat pump equipment is running in the cooling mode. At this time, the liquid storage device releases the refrigerant to the circulation system, increasing the release speed of the refrigerant, which can quickly increase the pressure of the refrigerant in the system, which is conducive to improving the discharge rate. Gas superheat; reducing the refrigerant release speed can slowly increase the refrigerant pressure in the system, which has the opposite effect on increasing the exhaust superheat, which is conducive to maintaining or reducing the exhaust superheat. For example, reducing the frequency of the compressor at the same time can achieve maintenance. Or reduce the exhaust superheat.
  • the refrigerant storage speed or refrigerant release speed in the direction that is conducive to increasing the refrigerant pressure in the heat pump equipment circulation system, such as reducing the refrigerant storage speed or increasing the refrigerant release speed; if the exhaust gas superheat is too high High, adjust the refrigerant storage speed or refrigerant release speed in the direction that is beneficial to reduce the refrigerant pressure in the circulation system of the heat pump equipment, such as increasing the refrigerant storage speed or reducing the refrigerant release speed, so as to maintain the exhaust superheat within a certain range .
  • the degree of superheat of the exhaust gas is within a certain range, it is beneficial to improve the cooling efficiency or heating efficiency of the heat pump equipment, and can reduce the phenomenon of liquid shock.
  • determining the refrigerant storage rate or refrigerant release rate of the liquid storage device includes: obtaining the current refrigerant amount of the liquid storage device; obtaining the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount value; according to the refrigerant amount difference and the degree of superheat of the exhaust gas, determine the refrigerant storage speed or refrigerant release speed of the liquid storage device.
  • the amount of refrigerant required by heat pump equipment in heating mode is less than the amount of refrigerant required by heat pump equipment in cooling mode.
  • the optimal amount of refrigerant required in heating mode and in The optimal amount of refrigerant required in the cooling mode is a known value, for example, the optimal amount of refrigerant required by the heat pump device in the heating mode and the optimal amount of refrigerant required by the heat pump device in the cooling mode are obtained through experiments.
  • the optimal amount of refrigerant refers to the amount of refrigerant that enables the heat pump equipment to have the highest cooling efficiency or heating efficiency.
  • the heat pump equipment After the heat pump equipment switches from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode. At this time, it is necessary to adjust the amount of refrigerant in the circulation system of the heat pump equipment to the optimal amount of refrigerant required by the heat pump equipment in the heating mode. That is, it is necessary to adjust the amount of refrigerant stored in the liquid storage device to a specific value, for example, adjust the amount of refrigerant in the liquid storage device to a first set refrigerant amount.
  • the heat pump equipment After the heat pump equipment switches from the heating mode to the cooling mode, the heat pump equipment operates in the cooling mode. At this time, the amount of refrigerant in the circulation system of the heat pump equipment needs to be adjusted to the optimal amount of refrigerant required by the heat pump equipment in the cooling mode, that is, It is necessary to adjust the amount of refrigerant stored in the liquid storage device to a specific value, for example, adjust the amount of refrigerant in the liquid storage device to a second set refrigerant amount, wherein the first set refrigerant amount is greater than the second set refrigerant amount.
  • the refrigerant storage speed or refrigerant release speed of the liquid storage device is adjusted according to the refrigerant amount difference, and the current refrigerant amount of the liquid storage device can be adjusted to the set refrigerant amount, that is, the circulation system of the heat pump equipment
  • the amount of refrigerant is adjusted to the optimal amount of refrigerant.
  • the heat pump equipment After the heat pump equipment is switched from the cooling mode to the heating mode, the heat pump equipment operates in the heating mode, the amount of refrigerant in the circulation system of the heat pump equipment is greater than the optimal amount of refrigerant required by the heat pump equipment in the heating mode, and the liquid storage device
  • the current amount of refrigerant is less than the first set refrigerant amount; after the heat pump equipment is switched from the heating mode to the cooling mode, the heat pump equipment is running in the cooling mode, and the refrigerant volume in the circulation system of the heat pump equipment is less than the maximum required by the heat pump equipment in the cooling mode.
  • Optimal amount of refrigerant the current amount of refrigerant in the liquid storage device is greater than the second set amount of refrigerant.
  • the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount can be obtained in the following ways: in the heating mode, the difference between the first set refrigerant amount and the current refrigerant amount is determined as the refrigerant amount difference; in the cooling mode , determining the difference between the current refrigerant amount and the second set refrigerant amount as the refrigerant amount difference.
  • the liquid storage device When the circulation system of the heat pump equipment is in the heating cycle, the liquid storage device is in the state of storing refrigerant, that is, the amount of refrigerant in the liquid storage device only increases and does not decrease; when the circulation system of the heat pump equipment is in the cooling mode, the liquid storage device is in the state of The state of releasing the refrigerant, that is, the amount of refrigerant in the liquid storage device only decreases but does not increase.
  • the amount of refrigerant can be adjusted to the set refrigerant amount more accurately, reducing the occurrence of excessive storage or excessive release.
  • determining the refrigerant storage speed or refrigerant release speed of the liquid storage device according to the refrigerant amount difference and the degree of superheat of the exhaust gas may include: obtaining the refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas; or the refrigerant release speed, to obtain the estimated time for making the refrigerant amount difference to zero; if the estimated time is less than the set time, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset time , so that the new estimated time period for the refrigerant amount difference to be zero is greater than or equal to the set time period.
  • the product of the refrigerant amount difference and the cross-sectional area of the liquid storage device can be calculated first, and then the The estimated duration can be obtained by multiplying the product by the refrigerant storage speed or refrigerant release speed.
  • the heat pump device When the heat pump device is in the heating mode, obtain the first refrigerant amount difference between the first set refrigerant amount and the current refrigerant amount, and determine that the current refrigerant amount reaches the first set refrigerant amount according to the first refrigerant amount difference and the refrigerant storage speed The first estimated duration of the amount. If the first estimated duration is less than the first set duration, the refrigerant storage speed is re-determined according to the first refrigerant amount difference and the first set duration.
  • the heat pump device When the heat pump device is in cooling mode, obtain the second refrigerant amount difference between the current refrigerant amount and the second set refrigerant amount, and determine that the current refrigerant amount reaches the second set refrigerant amount according to the second refrigerant amount difference and the refrigerant release speed The second estimated duration; if the second estimated duration is less than the second set duration, the refrigerant release rate is re-determined according to the second refrigerant amount difference and the second set duration.
  • the estimated duration includes the first preset duration and the second estimated duration
  • the set duration includes the first preset duration and the second preset duration.
  • the size relationship between the first preset duration and the second preset duration is not discussed. Specific limits.
  • the estimated duration is less than the set duration, it means that the current amount of refrigerant in the liquid storage device is about to reach the set amount of refrigerant.
  • the new estimated time period that becomes zero is greater than or equal to the set time period, so as to reduce the phenomenon that the liquid storage device stores too much refrigerant or releases refrigerant.
  • the flow control valve of the liquid storage device is controlled.
  • the refrigerant storage speed or refrigerant release speed will not be reduced, so as to reduce the adjustment of the current refrigerant amount to
  • the length of time required to set the amount of refrigerant that is, the length of time to reduce the amount of refrigerant in the circulation system of the heat pump equipment to reach the optimal amount of refrigerant; the difference between the current amount of refrigerant in the liquid storage device and the amount of refrigerant set is small
  • the refrigerant storage speed or refrigerant release speed is reduced to reduce the phenomenon that the liquid storage device stores too much refrigerant or releases refrigerant, and accurately adjusts the current refrigerant amount in the liquid storage device to the set refrigerant amount. That is, the amount of refrigerant in the circulation system of the heat pump device is accurately adjusted to the optimal amount of refrigerant.
  • the current amount of refrigerant is usually obtained by detecting the liquid level in the liquid storage device.
  • the liquid level of the liquid storage device changes quickly, that is, the cross-sectional area of the liquid storage device is small, you can set a A larger setting time; when the liquid level of the liquid storage device changes slowly, that is, the cross-sectional area of the liquid storage device is larger, a smaller setting time can be set.
  • the embodiment of the present disclosure does not limit the specific numerical value of the set duration, and those skilled in the art can determine an appropriate set duration according to the actual cross-sectional area of the liquid storage device.
  • the refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas can be obtained in the following manner: in the heating mode, if the degree of superheat of the exhaust gas is greater than the first set temperature, determine the refrigerant storage speed as the first storage speed; If the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the storage rate of the refrigerant as the second storage rate, wherein the first storage rate is greater than the second storage rate; in cooling mode, if the degree of superheat of the exhaust gas is greater than the second If the temperature is set, the refrigerant release rate is determined to be the first release rate; if the exhaust gas superheat is less than or equal to the second set temperature, the refrigerant release rate is determined to be the second release rate, wherein the first release rate is less than the second release rate speed.
  • the refrigerant amount difference is greater than the set refrigerant amount difference, perform the preceding steps: obtain the refrigerant storage speed or refrigerant release speed corresponding to the degree of superheat of the exhaust gas; obtain the refrigerant amount according to the refrigerant storage speed or refrigerant release speed The estimated time when the difference becomes zero; if the estimated time is less than the set time, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset time, so that the refrigerant amount difference becomes zero
  • the new estimated duration for is greater than or equal to the set duration.
  • the refrigerant storage rate or the refrigerant release rate is determined to be zero.
  • Setting the refrigerant amount difference is an exit condition for adjusting the refrigerant amount in the circulation system of the heat pump equipment.
  • the determined refrigerant storage speed or refrigerant release speed is also getting smaller and smaller, but the accuracy of the flow control valve of the liquid storage device is limited.
  • the refrigerant amount difference is less than or equal to the set refrigerant amount difference, Exit the adjustment process of the amount of refrigerant in the circulation system of the heat pump device to reduce the occurrence of a smaller meaningless refrigerant storage speed or refrigerant release speed (for example, a refrigerant storage speed or refrigerant release speed that is less than the minimum accuracy of the flow control valve, That is, the phenomenon of meaningless refrigerant storage speed or refrigerant release speed).
  • a smaller meaningless refrigerant storage speed or refrigerant release speed for example, a refrigerant storage speed or refrigerant release speed that is less than the minimum accuracy of the flow control valve, That is, the phenomenon of meaningless
  • the corresponding relationship between the inlet pressure, outlet pressure, refrigerant storage speed or refrigerant release speed, and the opening of the flow control valve of the liquid storage device can be stored in the database. After obtaining the inlet pressure and outlet pressure of the liquid storage device , the refrigerant storage speed or the refrigerant release speed, the opening of the flow control valve corresponding to the refrigerant storage speed or the refrigerant release speed can be obtained.
  • the correspondence between the operating frequency of the compressor, the refrigerant storage speed or refrigerant release speed, and the opening of the flow control valve can be stored in the database. After obtaining the compressor operating frequency, refrigerant storage speed or refrigerant release speed, That is, the opening degree of the flow control valve corresponding to the refrigerant storage speed or the refrigerant release speed can be obtained through the database.
  • the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system.
  • the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed;
  • the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system.
  • the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant.
  • the circulation of the heat pump equipment can be improved.
  • the amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.
  • the method for adjusting the exhaust superheat of the heat pump equipment may further include: reducing the frequency of the compressor when the exhaust superheat is greater than the set temperature, and /or, increase the fan speed of the heat pump equipment; increase the frequency of the compressor, and/or decrease the fan speed of the heat pump equipment when the degree of superheat of the exhaust gas is less than or a set temperature.
  • Fig. 4 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure.
  • the device for adjusting the exhaust superheat of the heat pump equipment is implemented in the form of software, hardware or a combination of the two. Referring to FIG.
  • the device for adjusting the exhaust superheat of the heat pump equipment includes: an obtaining module 41, a first determination module 42 and the first control module 43, wherein the obtaining module 41 is configured to obtain the exhaust superheat degree of the compressor of the heat pump equipment, and the operation mode of the heat pump equipment, the operation mode includes heating mode and cooling mode; the first determining module 42 is configured to determine the refrigerant storage speed or refrigerant release speed of the liquid storage device according to the operation mode and the degree of superheat of the exhaust gas, the refrigerant storage speed corresponds to the heating mode, and the refrigerant release speed corresponds to the cooling mode; the first control module 43 It is configured to adjust the flow control valve for controlling the liquid storage device to an opening degree corresponding to the refrigerant storage speed or the refrigerant release speed.
  • the heat pump equipment (such as a hot water machine) requires less refrigerant, and the refrigerant needs to be stored in the liquid storage device by the circulation system.
  • the adjustment of the superheat of the exhaust gas can be realized by adjusting the refrigerant storage speed;
  • the heat pump equipment needs more refrigerant, and the refrigerant needs to be released from the liquid storage device into the circulation system.
  • the adjustment of the superheat degree of the exhaust gas can be realized by adjusting the release speed of the refrigerant.
  • the circulation of the heat pump equipment can be improved.
  • the amount of refrigerant in the system meets the requirements of the operating mode, which improves the efficiency of the heat pump equipment; on the other hand, the degree of superheat of the exhaust gas can also be adjusted by adjusting the refrigerant release speed or refrigerant storage speed, which can take into account the refrigerant amount in the circulation system With the degree of superheat of the exhaust gas, the working efficiency of the heat pump equipment is improved.
  • the first determining module includes a first obtaining unit, a second obtaining unit, and a determining unit, wherein the first obtaining unit is configured to obtain the current amount of refrigerant of the liquid storage device;
  • the second obtaining unit is configured to obtain the refrigerant amount difference between the set refrigerant amount and the current refrigerant amount;
  • the determining unit is configured to determine a refrigerant storage rate or a refrigerant release rate of the liquid storage device according to the refrigerant amount difference and the degree of superheat of the exhaust gas.
  • the determination unit is specifically configured to: obtain a refrigerant storage rate or a refrigerant release rate corresponding to the degree of superheat of the exhaust gas; and obtain an estimated time period for making the refrigerant amount difference to zero according to the refrigerant storage rate or refrigerant release rate ;
  • the estimated duration is less than the set duration, re-determine the refrigerant storage speed or refrigerant release speed according to the refrigerant amount difference and the preset duration, so that the new estimated duration when the refrigerant amount difference becomes zero is greater than or equal to the set duration. Timing length.
  • obtaining the refrigerant storage rate or refrigerant release rate corresponding to the degree of superheat of the exhaust gas includes: in the heating mode, if the degree of superheat of the exhaust gas is greater than the first set temperature, determining that the refrigerant storage rate is the first storage rate speed; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the refrigerant storage speed as the second storage speed, wherein the first storage speed is greater than the second storage speed; in cooling mode, if the degree of superheat of the exhaust gas is greater than For the second set temperature, determine the refrigerant release rate as the first release rate; if the degree of superheat of the exhaust gas is less than or equal to the second set temperature, then determine the refrigerant release rate as the second release rate, wherein the first release rate is less than the first release rate 2. Release speed.
  • the first obtaining unit is specifically configured to: in the heating mode, determine the difference between the first set refrigerant amount and the current refrigerant amount as the refrigerant amount difference; in the cooling mode, determine the difference between the current refrigerant amount and The difference of the second set refrigerant amount is determined as the refrigerant amount difference; wherein, the first set refrigerant amount is greater than the second set refrigerant amount.
  • the device for adjusting the degree of superheating of the exhaust gas of the heat pump equipment further includes a second determination module configured to store the refrigerant The velocity or refrigerant release velocity is determined to be zero.
  • the device for adjusting the exhaust superheat of the heat pump equipment further includes a second control module and a third control module, and the second control module is configured to reduce the frequency, and/or, increase the fan speed of the heat pump equipment; the third control module is configured to increase the frequency of the compressor, and/or, reduce the fan speed of the heat pump equipment when the degree of superheat of the exhaust gas is less than or the set temperature Rotating speed.
  • the device for adjusting the exhaust superheat of the heat pump equipment includes a processor and a memory storing program instructions, and the processor is configured to execute the method for adjusting the heat pump equipment provided in the foregoing embodiments when executing the program instructions. Method of exhaust superheat.
  • Fig. 5 is a schematic diagram of a device for adjusting the superheat degree of exhaust gas from a heat pump device provided by an embodiment of the present disclosure.
  • the device for adjusting the exhaust superheat of the heat pump equipment includes:
  • a processor (processor) 51 and a memory (memory) 52 may also include a communication interface (Communication Interface) 53 and a bus 54. Wherein, the processor 51 , the communication interface 53 , and the memory 52 can communicate with each other through the bus 54 .
  • the communication interface 53 can be used for information transmission.
  • the processor 51 can call the logic instructions in the memory 52 to execute the method for adjusting the superheat degree of the exhaust gas of the heat pump device provided in the foregoing embodiments.
  • logic instructions in the above-mentioned memory 52 may be implemented in the form of software function units and when sold or used as an independent product, they may be stored in a computer-readable storage medium.
  • the memory 52 can be used to store software programs and computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure.
  • the processor 51 executes functional applications and data processing by running software programs, instructions and modules stored in the memory 52, that is, implements the methods in the foregoing method embodiments.
  • the memory 52 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal device, and the like.
  • the memory 52 may include a high-speed random access memory, and may also include a non-volatile memory.
  • An embodiment of the present disclosure provides a heat pump device, including the device for adjusting the superheat degree of exhaust gas from the heat pump device provided in the foregoing embodiments.
  • the heat pump device can be an air conditioner or a water heater.
  • An embodiment of the present disclosure provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are configured to execute the method for adjusting the superheat degree of exhaust gas from a heat pump device provided in the foregoing embodiments.
  • An embodiment of the present disclosure provides a computer program product.
  • the computer program product includes a computer program stored on a computer-readable storage medium.
  • the computer program includes program instructions. When the program instructions are executed by a computer, the computer is made to execute the information provided in the foregoing embodiments.
  • the above-mentioned computer-readable storage medium may be a transitory computer-readable storage medium, or a non-transitory computer-readable storage medium.
  • the technical solutions of the embodiments of the present disclosure can be embodied in the form of software products, which are stored in a storage medium and include one or more instructions to enable a computer device (which may be a personal computer, a server, or a network equipment, etc.) to execute all or part of the steps of the methods in the embodiments of the present disclosure.
  • the aforementioned storage medium can be a non-transitory storage medium, including: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk, etc.
  • the term “comprise” and its variants “comprises” and/or comprising (comprising) etc. refer to stated features, integers, steps, operations, elements, and/or The presence of a component does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groupings of these.
  • an element qualified by the statement “comprising a " does not preclude the presence of additional identical elements in the process, method or apparatus comprising the element.
  • what each embodiment focuses on may be the difference from other embodiments, and the same and similar parts of the various embodiments may refer to each other.
  • the relevant part can refer to the description of the method part.
  • the disclosed methods and products can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of units may only be a logical function division.
  • multiple units or components may be combined or may be Integrate into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.
  • a unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment.
  • each functional unit in the embodiments of the present disclosure may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • each block in a flowchart or block diagram may represent a module, program segment, or part of code that includes one or more executable instruction.
  • the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved.
  • Each block in the block diagrams and/or flowcharts, and combinations of blocks in the block diagrams and/or flowcharts can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by dedicated hardware implemented in combination with computer instructions.

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  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
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  • Analytical Chemistry (AREA)
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Abstract

La présente demande se rapporte au domaine technique des dispositifs de pompe à chaleur. Est divulgué un procédé de réglage d'un degré de surchauffe d'échappement d'un dispositif de pompe à chaleur. Le procédé de réglage du degré de surchauffe d'échappement du dispositif de pompe à chaleur comprend les étapes consistant à : obtenir un degré de surchauffe d'échappement d'un compresseur du dispositif de pompe à chaleur, et un mode de fonctionnement du dispositif de pompe à chaleur, le mode de fonctionnement comprenant un mode de chauffage et un mode de réfrigération ; déterminer une vitesse de stockage de fluide frigorigène ou une vitesse de libération de fluide frigorigène d'un appareil de stockage de liquide en fonction du mode de fonctionnement et du degré de surchauffe d'échappement, la vitesse de stockage de fluide frigorigène correspondant au mode de chauffage, et la vitesse de libération de fluide frigorigène correspondant au mode de réfrigération ; et ajuster, à un degré d'ouverture correspondant à la vitesse de stockage de fluide frigorigène ou à la vitesse de libération de fluide frigorigène, une vanne de débit pour commander l'appareil de stockage de liquide. En utilisant le procédé pour régler le degré de surchauffe d'échappement du dispositif de pompe à chaleur, à la fois la quantité de fluide frigorigène et le degré de surchauffe d'échappement dans un système de circulation peuvent être pris en considération, et l'efficacité de fonctionnement du dispositif de pompe à chaleur est améliorée. La présente demande divulgue en outre un appareil pour régler une surchauffe d'échappement d'un dispositif de pompe à chaleur, et un dispositif de pompe à chaleur.
PCT/CN2022/096115 2021-07-23 2022-05-31 Procédé et appareil pour régler le degré de surchauffe d'échappement d'un dispositif de pompe à chaleur, et dispositif de pompe à chaleur WO2023000828A1 (fr)

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