CN106931545B - Heat pump enthalpy-spraying system, control method thereof and air conditioner - Google Patents

Heat pump enthalpy-spraying system, control method thereof and air conditioner Download PDF

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Publication number
CN106931545B
CN106931545B CN201710189594.9A CN201710189594A CN106931545B CN 106931545 B CN106931545 B CN 106931545B CN 201710189594 A CN201710189594 A CN 201710189594A CN 106931545 B CN106931545 B CN 106931545B
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Prior art keywords
enthalpy
compressor
operating frequency
temperature sensor
heat pump
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CN106931545A (en
Inventor
韦汉儒
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GD Midea Air Conditioning Equipment Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/001—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems in which the air treatment in the central station takes place by means of a heat-pump or by means of a reversible cycle
    • 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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28—Arrangement or mounting of filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • 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
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/02—System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system
    • F24F2203/021—Compression cycle
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention provides a heat pump enthalpy-spraying system, a control method thereof and an air conditioner, wherein the heat pump enthalpy-spraying system comprises: the system comprises a compressor, a four-way valve, a condenser, a flash evaporator, an evaporator, a first throttling device, an enthalpy injection electromagnetic valve and a controller; and after the air conditioner is started and enters a heating mode, the controller acquires the operation frequency of the compressor in a preset time period, and controls the opening or closing of the enthalpy-injection electromagnetic valve according to a comparison result of the operation frequency of the compressor in the preset time period and a preset maximum operation frequency of the compressor. Therefore, the invention can judge whether the enthalpy spraying is needed at present according to the running frequency of the compressor at any time of heating, and can improve the heating capacity in time and the capacity and energy efficiency of the whole machine.

Description

Heat pump enthalpy-spraying system, control method thereof and air conditioner
Technical Field
The invention relates to the technical field of air conditioner control, in particular to a heat pump enthalpy-spraying system, a control method thereof and an air conditioner.
Background
In order to obtain a better heating effect under the low temperature condition, the current air conditioning unit increases the heat output by a method of supplementing air and increasing enthalpy. However, in many methods for controlling the enthalpy of injection, an outdoor ambient temperature sensor is used to detect the ambient temperature to determine whether the temperature is low, and if the temperature is low, the enthalpy of injection is controlled.
The disadvantage of the above-mentioned control method is that the spray enthalpy cannot be performed in time when the heating capacity is relatively large, which makes the spray enthalpy effect very poor. And if the enthalpy injection temperature is not well controlled, the compressor can be possibly reversely injected, so that the enthalpy injection effect is reduced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a heat pump enthalpy-spraying system, a control method thereof and an air conditioner, which can solve the problem that the enthalpy-spraying control method in the prior art can not timely spray enthalpy when the heating quantity is required to be relatively large.
In a first aspect, the present invention provides a heat pump enthalpy injection system comprising: the system comprises a compressor, a four-way valve, a condenser, a flash evaporator, an evaporator, a first throttling device, an enthalpy injection electromagnetic valve and a controller;
the air outlet of the compressor is connected with the first interface of the four-way valve, the air suction port of the compressor is connected with the second interface of the four-way valve, the first end of the evaporator is connected with the third interface of the four-way valve, and the first end of the condenser is connected with the fourth interface of the four-way valve; the first end of the flash evaporator is connected with the second end of the evaporator, the second end of the flash evaporator is connected with the second end of the condenser, and the third end of the flash evaporator is connected with the enthalpy-spraying port of the compressor; the first throttling device is arranged on a connecting pipeline between the condenser and the flash evaporator, and the enthalpy injection electromagnetic valve is arranged on a connecting pipeline between the flash evaporator and the compressor;
the controller is respectively connected with the compressor and the enthalpy injection electromagnetic valve, and is used for acquiring the compressor operating frequency in a preset time period after the air conditioner is started and enters a heating mode, and controlling the opening or closing of the enthalpy injection electromagnetic valve according to a comparison result of the compressor operating frequency in the preset time period and a preset maximum compressor operating frequency.
Optionally, the heat pump enthalpy injection system further comprises: an external environmental temperature sensor for detecting an outdoor environmental temperature;
correspondingly, the controller is connected with the external environment temperature sensor and is used for receiving the outdoor environment temperature detected by the external environment temperature sensor and inquiring the preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature.
Optionally, the controller is specifically configured to:
when the air conditioner enters a heating mode and operates for a first preset time period, acquiring the outdoor environment temperature detected by the external environment temperature sensor, and acquiring the current first operating frequency of the compressor;
inquiring to obtain a preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature, and obtaining a second operating frequency of the compressor when the operation is performed at a second preset time interval;
if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the first operating frequency is equal to the second operating frequency, opening the enthalpy-injection electromagnetic valve;
and if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the second operating frequency is smaller than the preset maximum operating frequency of the compressor, closing the enthalpy injection electromagnetic valve.
Optionally, the heat pump enthalpy injection system further comprises: the second throttling device, the enthalpy-spraying temperature sensor and the flash evaporation temperature sensor;
the second throttling device is arranged on a connecting pipeline between the flash evaporator and the evaporator, the enthalpy-spraying temperature sensor is arranged at an enthalpy-spraying port of the compressor, and the flash evaporation temperature sensor is arranged on a connecting pipeline between the enthalpy-spraying electromagnetic valve and the flash evaporator;
the controller is respectively connected with the second throttling device, the enthalpy-spraying temperature sensor and the flash evaporation temperature sensor, and is used for adjusting the opening of the second throttling device according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor, so that the difference value between the first temperature and the second temperature is equal to a preset threshold value, and the enthalpy-spraying pressure is larger than the pressure after primary compression of the compressor.
Optionally, the controller is specifically configured to:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF;
the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient.
Optionally, the first throttling device and the second throttling device are electronic expansion valves.
Optionally, the heat pump enthalpy injection system further comprises: a first filter, a second filter, a third filter, and a fourth filter;
the first filter is arranged on a connecting pipeline between the first throttling device and the condenser, and the second filter is arranged on a connecting pipeline between the first throttling device and the flash evaporator;
the third filter is arranged on a connecting pipeline between the second throttling device and the flash evaporator, and the fourth filter is arranged on a connecting pipeline between the second throttling device and the evaporator.
Optionally, the heat pump enthalpy injection system further comprises: a gas-liquid separator;
the first end of the gas-liquid separator is connected with the air suction port of the compressor, and the second end of the gas-liquid separator is connected with the second interface of the four-way valve.
In a second aspect, the present invention provides an enthalpy injection control method based on any one of the above heat pump enthalpy injection systems, where the method includes:
after the air conditioner is started and enters a heating mode, acquiring the operation frequency of the compressor in a preset time period;
and controlling the opening or closing of the enthalpy-injection electromagnetic valve according to a comparison result of the compressor running frequency in the preset time period and the preset maximum compressor running frequency.
Optionally, the controlling the opening or closing of the enthalpy-injection solenoid valve according to the comparison result of the compressor operation frequency in the preset time period and the preset maximum compressor operation frequency includes:
when the air conditioner enters a heating mode and operates for a first preset time period, acquiring the outdoor environment temperature detected by the external environment temperature sensor, and acquiring the current first operating frequency of the compressor;
inquiring to obtain a preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature, and obtaining a second operating frequency of the compressor when the operation is performed at a second preset time interval;
if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the first operating frequency is equal to the second operating frequency, opening the enthalpy-injection electromagnetic valve;
and if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the second operating frequency is smaller than the preset maximum operating frequency of the compressor, closing the enthalpy injection electromagnetic valve.
Optionally, the method further comprises:
after the enthalpy-spraying electromagnetic valve is opened, the opening degree of the second throttling device is adjusted according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor, so that the difference value between the first temperature and the second temperature is equal to a preset threshold value, and the enthalpy-spraying pressure is larger than the pressure after primary compression of the compressor.
Optionally, the adjusting the opening degree of the second throttling device according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor so that the difference between the first temperature and the second temperature is equal to a preset threshold value includes:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF;
the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient.
In a third aspect, the present invention provides an air conditioner, including any one of the heat pump enthalpy-injection systems described above.
As can be seen from the above technical scheme, the invention provides a heat pump enthalpy-spraying system, a control method thereof and an air conditioner, wherein after the air conditioner is started and enters a heating mode, the compressor operating frequency in a preset time period is obtained; judging whether the heating capacity of the air conditioner is enough or not according to a comparison result of the compressor running frequency in the preset time period and the preset maximum compressor running frequency, if the compressor runs at the maximum running frequency all the time in the preset time period, indicating that the heating capacity of the air conditioner is insufficient, further opening the enthalpy injection electromagnetic valve to supplement air and increase enthalpy or closing the enthalpy injection electromagnetic valve.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other drawings can be obtained from these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a heat pump enthalpy injection system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an enthalpy injection control method of a heat pump enthalpy injection system according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of an enthalpy injection control method of a heat pump enthalpy injection system according to another embodiment of the present invention;
fig. 4 is a schematic flow chart of an enthalpy injection control method of a heat pump enthalpy injection system according to another embodiment of the present invention;
the reference numerals in fig. 1 illustrate: 1-compressor, 2-four-way valve, 3-condenser, 4-outer fan, 5-first filter, 6-first throttling device, 7-second filter, 8-flash evaporator, 9-third filter, 10-second throttling device, 11-fourth filter, 12-inner fan, 13-evaporator, 14-gas-liquid separator, 15-outer environmental temperature sensor, 16-flash evaporation temperature sensor, 17-enthalpy injection solenoid valve, 18-enthalpy injection temperature sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic structural diagram of a heat pump enthalpy injection system according to an embodiment of the invention, as shown in fig. 1, the heat pump enthalpy injection system includes: a compressor 1, a four-way valve 2, a condenser 3, a flash evaporator 8, an evaporator 13, a first throttle device 6, an enthalpy injection solenoid valve 17, and a controller (not shown in the figure). Wherein, the compressor 1 is provided with an air suction port, an air exhaust port and an enthalpy injection port; the four-way valve 2 has a first port, a second port, a third port and a fourth port.
As shown in fig. 1, the exhaust port of the compressor 1 is connected with a first interface of the four-way valve 2, the air suction port of the compressor 1 is connected with a second interface of the four-way valve 2, the first end of the evaporator 13 is connected with a third interface of the four-way valve 2, and the first end of the condenser 3 is connected with a fourth interface of the four-way valve 2; the first end of the flash evaporator 8 is connected with the second end of the evaporator 13, the second end of the flash evaporator 8 is connected with the second end of the condenser 3, and the third end of the flash evaporator 8 is connected with the enthalpy-spraying port of the compressor 1; the first throttling device 6 is arranged on a connecting pipeline between the condenser 3 and the flash evaporator 8, and the enthalpy injection electromagnetic valve 17 is arranged on a connecting pipeline between the flash evaporator 8 and the compressor 1.
The controller is respectively connected with the compressor 1 and the enthalpy injection electromagnetic valve 17, and is configured to obtain a compressor operating frequency in a preset time period after the air conditioner is started and enters a heating mode, and control opening or closing of the enthalpy injection electromagnetic valve according to a comparison result of the compressor operating frequency in the preset time period and a preset maximum compressor operating frequency.
In this embodiment, the compressor 1 compresses a refrigerant and provides flowing power, the four-way valve 2 is used as a component for refrigerating and heating switching directions, the condenser 3 and the evaporator 13 are used for heat exchange of the refrigerant, the outer fan 4 and the inner fan 12 are used for providing a power source for air, the flash evaporator 8 provides flash evaporation steam for enthalpy injection, and the enthalpy injection electromagnetic valve 17 realizes on-off of a refrigerant channel.
Specifically, during heating, the compressor 1 discharges a high-temperature and high-pressure gas refrigerant, the high-temperature and high-pressure gas refrigerant flows through the four-way valve 2, enters the evaporator 13, drives the cooling medium air to exchange heat with the high-temperature and high-pressure gas refrigerant in the pipe through the rotation of the inner fan 12, the refrigerant is cooled into a medium-temperature and high-pressure refrigerant, the medium enters the flash evaporator 8, one main flow path passes through the first throttling device 6, the throttling device is used for controlling the capacity of a unit and then enters the condenser 3, the outer fan 4 drives the outdoor hot air to exchange heat with the low-temperature and low-pressure gas-liquid two-phase refrigerant in the pipe, and the refrigerant flows through the four-way valve 2 after absorbing heat and evaporating and then returns to the compressor 1 for circulation; the refrigerant entering one auxiliary loop of the flash evaporator 8 flows through the enthalpy injection electromagnetic valve 17 and enters the enthalpy injection port of the compressor 1 to realize enthalpy-increasing compression.
Further, the controller obtains the operation frequency of the compressor in the preset time period, and judges whether the heating capacity of the air conditioner is enough according to the comparison result of the operation frequency of the compressor in the preset time period and the preset maximum operation frequency of the compressor, if the compressor always operates at the maximum operation frequency in the preset time period, the heating capacity of the air conditioner is insufficient, if the operation frequency of the compressor decreases in the preset time period, the heating capacity of the air conditioner is sufficient, further, if the operation frequency is insufficient, the enthalpy injection electromagnetic valve 17 is opened to supplement air and increase enthalpy, or if the operation frequency is sufficient, the enthalpy injection electromagnetic valve 17 is closed.
It will be appreciated that if the air conditioner is not in the heating mode, i.e. the air conditioner is in the other mode, the enthalpy injection solenoid valve 17 is controlled to be closed.
Therefore, in the embodiment, after the air conditioner is started and enters a heating mode, the operation frequency of the compressor in a preset time period is obtained; judging whether the heating capacity of the air conditioner is enough or not according to a comparison result of the compressor operation frequency in the preset time period and the preset maximum compressor operation frequency, if the compressor is operated at the maximum operation frequency all the time in the preset time period, the heating capacity of the air conditioner is insufficient, and further opening the enthalpy injection electromagnetic valve to supplement air and increase enthalpy or closing the enthalpy injection electromagnetic valve.
Further, in an alternative embodiment of the present invention, as shown in fig. 1, the heat pump enthalpy injection system further includes: an outside environment temperature sensor 15 for detecting an outside environment temperature.
Correspondingly, the controller is connected with the external environment temperature sensor 15, and is configured to receive the outdoor environment temperature detected by the external environment temperature sensor, and query and obtain the preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature.
Specifically, the controller is specifically configured to:
when the air conditioner enters a heating mode and operates for a first preset time period, acquiring the outdoor environment temperature detected by the external environment temperature sensor, and acquiring the current first operating frequency of the compressor;
inquiring to obtain a preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature, and obtaining a second operating frequency of the compressor when the operation is performed at a second preset time interval;
if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the first operating frequency is equal to the second operating frequency, opening the enthalpy-injection electromagnetic valve;
and if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the second operating frequency is smaller than the preset maximum operating frequency of the compressor, closing the enthalpy injection electromagnetic valve.
Specifically, after the air conditioner is started, the controller enters a heating mode and reaches a preset time period T1, and the controller detects the outdoor environment temperature T through the external environment temperature sensor 15 External ambient temperature And records the running frequency F1 of the compressor at the moment; by querying T External ambient temperature The corresponding preset maximum operation frequency F0 of the compressor is set; after the running interval time t2 is continued, detecting the running frequency F2 of the compressor at the moment; comparing the magnitudes of F0, F1, F2, typically within a short period of time during power-on,the compressor operating frequency is equal to a preset maximum operating frequency F0 at the ambient temperature, i.e., f0=f1; if f0=f1=f2, which indicates that the heating capacity of the system is insufficient, the compressor needs to be heated by long-term high-frequency operation, and the heating capacity needs to be increased by the injection enthalpy, the injection enthalpy electromagnetic valve 17 is controlled to be opened at the moment; if F2<F0 When the heat is supplied by the air conditioner, the rate of heat supplied by the air conditioner is high, the indoor temperature is obviously increased, and the heating amount is not required to be increased by the enthalpy injection, so that the enthalpy injection electromagnetic valve 17 is controlled to be closed.
It can be seen that, in this embodiment, the controller detects whether the frequency of the compressor is reduced within a certain period of time, if the compressor is operated at a high frequency all the time, the heating capacity is insufficient, so as to determine whether the rate of heat supplied by the system is sufficient at this time, and if the rate of heat supplied by the system is insufficient, the enthalpy-increasing solenoid valve 17 needs to be opened to perform air-supplementing enthalpy-increasing.
Further, in an alternative embodiment of the present invention, as shown in fig. 1, the heat pump enthalpy injection system further includes: a second throttling device 10, an enthalpy-injection temperature sensor 18 and a flash temperature sensor 16.
Wherein the second throttling device 10 is arranged on a connecting pipeline between the flash evaporator 8 and the evaporator 13 and is used for controlling the enthalpy injection pressure; the enthalpy-injection temperature sensor 18 is arranged at an enthalpy-injection port of the compressor 1 and is used for detecting the temperature of the refrigerant after primary compression; the flash evaporation temperature sensor 16 is arranged on a connecting pipeline between the enthalpy injection electromagnetic valve 17 and the flash evaporator 8 and is used for detecting the temperature of a gaseous refrigerant outlet of the flash evaporator 8.
Further, the controller is connected to the second throttling device 10, the enthalpy-injection temperature sensor 18 and the flash evaporation temperature sensor 16, respectively, and is configured to adjust the opening of the second throttling device 10 according to the first temperature detected by the enthalpy-injection temperature sensor 18 and the second temperature detected by the flash evaporation temperature sensor 16, so that the difference between the first temperature and the second temperature is equal to a preset threshold, so that the enthalpy-injection pressure is greater than the pressure after the first-stage compression of the compressor.
Specifically, the controller is specifically configured to:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF; the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient.
Therefore, in this embodiment, in the process of air supplementing and enthalpy increasing, the opening degree of the second throttling device 10 is adjusted to control the degree of superheat of the spray enthalpy, so that the spray enthalpy pressure is greater than the pressure after primary compression, thereby avoiding the reverse spray of the compressor 1, further improving the capacity and energy efficiency of the whole machine, and providing good comfort for users.
Wherein, the first throttling device 6 and the second throttling device 10 can be electronic expansion valves.
Further, in an alternative embodiment of the present invention, as shown in fig. 1, the heat pump enthalpy injection system further includes: a first filter 5, a second filter 7, a third filter 9 and a fourth filter 11.
Wherein the first filter 5 is disposed on a connection line between the first throttling device 6 and the condenser 3, and the second filter 7 is disposed on a connection line between the first throttling device 6 and the flash evaporator 8; the third filter 9 is disposed on a connection line between the second throttle device 10 and the flash evaporator 8, and the fourth filter 11 is disposed on a connection line between the second throttle device 10 and the evaporator 13.
In this embodiment, the first filter 5, the second filter 7, the third filter 9 and the fourth filter 11 are throttle devices for filtering impurities entrained in the refrigerant.
Further, in an alternative embodiment of the present invention, as shown in fig. 1, the heat pump enthalpy injection system further includes: a gas-liquid separator 14.
Wherein, the first end of the gas-liquid separator 14 is connected with the air suction port of the compressor 1, and the second end of the gas-liquid separator 14 is connected with the second interface of the four-way valve 2.
In this embodiment, the gas-liquid separator 14 is used to separate liquid and gaseous refrigerants.
Fig. 2 is a schematic flow chart of an enthalpy injection control method based on the heat pump enthalpy injection system in any of the above embodiments according to an embodiment of the present invention, as shown in fig. 2, the method includes the following steps:
s1: after the air conditioner is started and enters a heating mode, the operation frequency of the compressor in a preset time period is obtained.
S2: and controlling the opening or closing of the enthalpy-injection electromagnetic valve according to a comparison result of the compressor running frequency in the preset time period and the preset maximum compressor running frequency.
Specifically, if the compressor is operated at the maximum operating frequency all the time in the preset time period, the heating capacity of the air conditioner is insufficient, so that the enthalpy-injecting electromagnetic valve is opened to supplement air and increase enthalpy; if the running frequency of the compressor is reduced in the preset time period, the speed of the air conditioner for improving the heat is higher, the heating quantity provided by the air conditioner is enough, the heating quantity is not required to be improved through the enthalpy injection, and the enthalpy injection electromagnetic valve is closed.
In this embodiment, after the air conditioner is started and enters a heating mode, the operation frequency of the compressor in a preset time period is obtained; judging whether the heating capacity of the air conditioner is enough or not according to a comparison result of the compressor operation frequency in the preset time period and the preset maximum compressor operation frequency, if the compressor is operated at the maximum operation frequency all the time in the preset time period, the heating capacity of the air conditioner is insufficient, and further opening the enthalpy injection electromagnetic valve to supplement air and increase enthalpy or closing the enthalpy injection electromagnetic valve.
Specifically, in an alternative embodiment of the present invention, as shown in fig. 3, the step S2 specifically includes:
s21: when the air conditioner enters a heating mode and runs for a first preset time period, acquiring the outdoor environment temperature detected by an external environment temperature sensor, and acquiring the first running frequency F1 of the current compressor;
s22: inquiring to obtain a preset maximum operating frequency F0 of the compressor corresponding to the outdoor environment temperature;
s23: obtaining a second operating frequency F2 of the compressor when the operation is continued for a second preset time period;
s24: comparing the sizes of F0, F1 and F2;
s25: if f0=f1=f2, opening the enthalpy injection solenoid valve;
s26: if f2< f0=f1, the enthalpy injection solenoid valve is closed.
Specifically, after the air conditioner is started, the air conditioner enters a heating mode and reaches a preset time period T1, and the outdoor environment temperature T is detected by the external environment temperature sensor 15 External ambient temperature And records the running frequency F1 of the compressor at the moment; by querying T External ambient temperature The corresponding preset maximum operation frequency F0 of the compressor is set; after the running interval time t2 is continued, detecting the running frequency F2 of the compressor at the moment; comparing the magnitudes of F0, F1, F2, wherein the compressor operating frequency is generally equal to the preset maximum operating frequency F0 at the ambient temperature within a short period of time during start-up, i.e., f0=f1; if f0=f1=f2, which indicates that the heating capacity of the system is insufficient, the compressor needs to be heated by long-term high-frequency operation, and the heating capacity needs to be increased by the injection enthalpy, the injection enthalpy electromagnetic valve 17 is controlled to be opened at the moment; if F2<F0 When the heat is supplied by the air conditioner, the rate of heat supplied by the air conditioner is high, the indoor temperature is obviously increased, and the heating amount is not required to be increased by the enthalpy injection, so that the enthalpy injection electromagnetic valve 17 is controlled to be closed.
Therefore, in this embodiment, by detecting whether the frequency of the compressor is reduced within a certain period of time, if the compressor is operated at a high frequency all the time, the insufficient heating capacity is indicated, so that it is determined whether the rate of heat supplied by the system is sufficient at this time, and if the rate of heat supplied by the system is insufficient, the enthalpy-increasing solenoid valve needs to be opened to perform air-supplementing and enthalpy-increasing.
Further, as shown in fig. 4, after the step S25, the method further includes the following steps:
s27: and adjusting the opening degree of the second throttling device according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor, so that the difference value between the first temperature and the second temperature is equal to a preset threshold value, and the enthalpy-spraying pressure is larger than the pressure after primary compression of the compressor.
It is understood that after this step S27, after a period of time, the process returns to step S22 to perform the cycle.
Specifically, the step S27 specifically includes:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF;
the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient. K is a given value through experiments.
Therefore, in this embodiment, in the process of air supplementing and enthalpy increasing, the degree of superheat of the injection enthalpy is controlled by adjusting the opening of the second throttling device, so that the injection enthalpy pressure is greater than the pressure after primary compression, thereby avoiding the reverse injection of the compressor, further improving the capacity and energy efficiency of the whole machine, and providing good comfort for users.
An embodiment of the present invention provides an air conditioner, including the heat pump enthalpy injection system in any of the above embodiments. The air conditioner comprises any heat pump enthalpy-spraying system, so that the same technical problems can be solved, and the same technical effects can be achieved.
In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A heat pump enthalpy injection system, characterized in that the heat pump enthalpy injection system comprises: the system comprises a compressor, a four-way valve, a condenser, a flash evaporator, an evaporator, a first throttling device, an enthalpy injection electromagnetic valve and a controller;
the air outlet of the compressor is connected with the first interface of the four-way valve, the air suction port of the compressor is connected with the second interface of the four-way valve, the first end of the evaporator is connected with the third interface of the four-way valve, and the first end of the condenser is connected with the fourth interface of the four-way valve; the first end of the flash evaporator is connected with the second end of the evaporator, the second end of the flash evaporator is connected with the second end of the condenser, and the third end of the flash evaporator is connected with the enthalpy-spraying port of the compressor; the first throttling device is arranged on a connecting pipeline between the condenser and the flash evaporator, and the enthalpy injection electromagnetic valve is arranged on a connecting pipeline between the flash evaporator and the compressor;
the controller is respectively connected with the compressor and the enthalpy injection electromagnetic valve, and is used for acquiring the compressor operating frequency in a preset time period after the air conditioner is started and enters a heating mode, and controlling the opening or closing of the enthalpy injection electromagnetic valve according to a comparison result of the compressor operating frequency in the preset time period and a preset maximum compressor operating frequency;
the heat pump enthalpy injection system further includes: an external environmental temperature sensor for detecting an outdoor environmental temperature;
correspondingly, the controller is connected with the external environment temperature sensor and is used for receiving the outdoor environment temperature detected by the external environment temperature sensor and inquiring the preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature;
the controller is specifically configured to:
when the air conditioner enters a heating mode and operates for a first preset time period, acquiring the outdoor environment temperature detected by the external environment temperature sensor, and acquiring the current first operating frequency of the compressor;
inquiring to obtain a preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature, and obtaining a second operating frequency of the compressor when the operation is performed at a second preset time interval;
if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the first operating frequency is equal to the second operating frequency, opening the enthalpy-injection electromagnetic valve;
and if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the second operating frequency is smaller than the preset maximum operating frequency of the compressor, closing the enthalpy injection electromagnetic valve.
2. The heat pump enthalpy injection system according to claim 1, characterized in that the heat pump enthalpy injection system further comprises: the second throttling device, the enthalpy-spraying temperature sensor and the flash evaporation temperature sensor;
the second throttling device is arranged on a connecting pipeline between the flash evaporator and the evaporator, the enthalpy-spraying temperature sensor is arranged at an enthalpy-spraying port of the compressor, and the flash evaporation temperature sensor is arranged on a connecting pipeline between the enthalpy-spraying electromagnetic valve and the flash evaporator;
the controller is respectively connected with the second throttling device, the enthalpy-spraying temperature sensor and the flash evaporation temperature sensor, and is used for adjusting the opening degree of the second throttling device according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor after the enthalpy-spraying electromagnetic valve is opened, so that the difference value between the first temperature and the second temperature is equal to a preset threshold value, and the enthalpy-spraying pressure is larger than the pressure after primary compression of the compressor.
3. The heat pump enthalpy injection system according to claim 2, characterized in that the controller is specifically configured to:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF;
the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient.
4. The heat pump enthalpy injection system of claim 2, wherein the first and second throttling devices are electronic expansion valves.
5. The heat pump enthalpy injection system according to claim 2, characterized in that the heat pump enthalpy injection system further comprises: a first filter, a second filter, a third filter, and a fourth filter;
the first filter is arranged on a connecting pipeline between the first throttling device and the condenser, and the second filter is arranged on a connecting pipeline between the first throttling device and the flash evaporator;
the third filter is arranged on a connecting pipeline between the second throttling device and the flash evaporator, and the fourth filter is arranged on a connecting pipeline between the second throttling device and the evaporator.
6. The heat pump enthalpy injection system according to claim 2, characterized in that the heat pump enthalpy injection system further comprises: a gas-liquid separator;
the first end of the gas-liquid separator is connected with the air suction port of the compressor, and the second end of the gas-liquid separator is connected with the second interface of the four-way valve.
7. A method of controlling the enthalpy injection based on the heat pump enthalpy injection system according to any one of claims 1 to 6, characterized by comprising:
after the air conditioner is started and enters a heating mode, acquiring the operation frequency of the compressor in a preset time period;
controlling the opening or closing of the enthalpy-injection electromagnetic valve according to a comparison result of the compressor operation frequency in the preset time period and the preset maximum compressor operation frequency;
and controlling the opening or closing of the enthalpy-injection electromagnetic valve according to the comparison result of the compressor operation frequency in the preset time period and the preset maximum compressor operation frequency, wherein the method comprises the following steps of:
when the air conditioner enters a heating mode and operates for a first preset time period, acquiring the outdoor environment temperature detected by the external environment temperature sensor, and acquiring the current first operating frequency of the compressor;
inquiring to obtain a preset maximum operating frequency of the compressor corresponding to the outdoor environment temperature, and obtaining a second operating frequency of the compressor when the operation is performed at a second preset time interval;
if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the first operating frequency is equal to the second operating frequency, opening the enthalpy-injection electromagnetic valve;
and if the first operating frequency is equal to the preset maximum operating frequency of the compressor and the second operating frequency is smaller than the preset maximum operating frequency of the compressor, closing the enthalpy injection electromagnetic valve.
8. The method of claim 7, wherein the method further comprises:
the second throttling device is arranged on a connecting pipeline between the flash evaporator and the evaporator, the enthalpy-spraying temperature sensor is arranged at the enthalpy-spraying port of the compressor, and the flash evaporation temperature sensor is arranged on a connecting pipeline between the enthalpy-spraying electromagnetic valve and the flash evaporator;
after the enthalpy-spraying electromagnetic valve is opened, the opening degree of the second throttling device is adjusted according to the first temperature detected by the enthalpy-spraying temperature sensor and the second temperature detected by the flash evaporation temperature sensor, so that the difference value between the first temperature and the second temperature is equal to a preset threshold value, and the enthalpy-spraying pressure is larger than the pressure after primary compression of the compressor.
9. The method of claim 8, wherein the adjusting the opening of the second throttling device according to the first temperature detected by the enthalpy-injection temperature sensor and the second temperature detected by the flash temperature sensor such that the difference between the first temperature and the second temperature is equal to a preset threshold value includes:
adjusting the opening degree of the second throttling device so that the superheat degree of the spray enthalpy meets DeltaT=K×DeltaF;
the delta T is the difference between the first temperature and the second temperature, the delta T is more than or equal to 0, the delta F is the difference between the maximum operating frequency of the compressor and the minimum operating frequency of the compressor corresponding to the current outdoor environment temperature, and the K is the air supplementing coefficient.
10. An air conditioner comprising the heat pump enthalpy injection system according to any one of claims 1 to 6.
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CN110940123B (en) * 2019-11-29 2021-06-04 广东海悟科技有限公司 Air supplementing port normally-open type variable frequency compressor air supplementing and enthalpy increasing system, control method thereof and computer readable storage medium
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