CN109682022B - Expansion valve control method and device and air conditioning system - Google Patents

Expansion valve control method and device and air conditioning system Download PDF

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Publication number
CN109682022B
CN109682022B CN201811603443.4A CN201811603443A CN109682022B CN 109682022 B CN109682022 B CN 109682022B CN 201811603443 A CN201811603443 A CN 201811603443A CN 109682022 B CN109682022 B CN 109682022B
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expansion valve
state
closed
indoor unit
opening degree
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CN109682022A (en
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李丛来
王晓楠
王战术
石靖峰
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F24F11/88—Electrical aspects, e.g. circuits
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/31—Expansion valves
    • 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
    • F25B43/003—Filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2500/00—Problems to be solved
    • F25B2500/06—Damage
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Analytical Chemistry (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an expansion valve control method and device and an air conditioning system, relates to the technical field of air conditioners and aims to solve the problem that internal parts of an expansion valve are damaged by impurities contained in a refrigerant on the premise of not influencing the normal work of the air conditioning system. The expansion valve control method comprises the following steps: receiving operation control information of an indoor unit; analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to operation control information of the indoor unit; if yes, controlling the opening value of the expansion valve in the state of waiting to be closed to be equal to K1So that impurities of an inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant; controlling the opening degree of the expansion valve in the state to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed. The expansion valve control device adopts the expansion valve control method. The expansion valve control method and device and the air conditioning system provided by the invention are used in an indoor unit.

Description

Expansion valve control method and device and air conditioning system
Technical Field
The invention relates to the technical field of air conditioners, in particular to an expansion valve control method and device and an air conditioning system.
Background
With the rapid development of the multi-split air conditioner market, the application of the household multi-split air conditioner in a common household is more and more common. The multi-split air conditioner is an air conditioning system with good unit adaptability and wide refrigerating and heating temperature range, has high design freedom, is convenient to install and charge, can effectively save energy, and meets the requirements of consumers on comfort, convenience and the like.
The existing multi-split air conditioner comprises an outdoor unit and an indoor unit, under the condition that the opening degree of an expansion valve carried by a heat exchanger contained in the indoor unit is smaller, impurities contained in a refrigerant are easily blocked in an internal channel of the expansion valve, and when the expansion valve is closed, the impurities blocked in the expansion valve damage internal components such as a valve needle and a valve seat in the expansion valve, so that the expansion valve is not closed tightly. Aiming at the problem, high-density filter screens can be arranged at the inlet and the outlet of the expansion valve to isolate impurities contained in the refrigerant, so that the impurities contained in the refrigerant are prevented from entering the expansion valve, but the pressure loss of the expansion valve is increased, the system pressure of the multi-split air conditioner is abnormal, and the multi-split air conditioner cannot work normally.
Disclosure of Invention
The invention aims to provide an expansion valve control method and device and an air conditioning system, which aim to reduce the problem that internal parts of the expansion valve are damaged by impurities contained in a refrigerant on the premise of not influencing the normal operation of the air conditioning system.
In order to achieve the above object, the present invention provides an expansion valve control method including:
receiving operation control information of an indoor unit;
analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to operation control information of the indoor unit;
if the expansion valve of the indoor unit contained in the indoor unit is in a to-be-closed state, controlling the opening value of the expansion valve in the to-be-closed state to be equal to K1So that impurities of an inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant;
controlling the opening degree of the expansion valve in the state to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed, KoffIs an opening value of the expansion valve that characterizes the closed state.
Compared with the prior art, the expansion valve control method provided by the invention controls the expansion valve to be in the state to be closed before controlling the expansion valve to be in the state to be closedOpening degree value of the expansion valve is equal to K1The impurities in the internal channel of the expansion valve in the state of waiting for closing are carried out from the expansion valve by the refrigerant, so that the internal channel of the expansion valve can not have the retained impurities, and the problem that the internal parts of the expansion valve are damaged by the impurities contained in the refrigerant can not occur when the expansion valve in the state of waiting for closing is closed; in addition, the expansion valve control method provided by the invention can avoid the internal parts of the expansion valve from being damaged by the impurities contained in the refrigerant only by controlling the opening degree of the expansion valve, so that the internal parts of the expansion valve can be effectively prevented from being damaged by the impurities contained in the refrigerant under the condition of ensuring the normal operation of the air conditioning system.
The present invention also provides an expansion valve control device, comprising:
the receiving module is used for receiving operation control information of the indoor unit;
the processing module is used for analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to the operation control information of the indoor unit;
a control module for controlling the opening value of the expansion valve in the state to be closed to be equal to K when the expansion valve of the indoor unit in the indoor unit is in the state to be closed1So that impurities of an inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant; controlling the opening degree of the expansion valve in the state to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed, KoffIs an opening value of the expansion valve that characterizes the closed state.
Compared with the prior art, the beneficial effects of the expansion valve control device provided by the invention are the same as those of the expansion valve control method, and are not repeated herein.
Embodiments of the present invention further provide a computer storage medium for storing one or more computer instructions, where the computer software instructions include a computer program designed to execute the above-mentioned expansion valve control method.
Compared with the prior art, the beneficial effects of the computer storage medium provided by the invention are the same as those of the expansion valve control method, and are not repeated herein.
The invention also provides an air conditioning system which comprises the expansion valve control device in the technical scheme.
Compared with the prior art, the beneficial effects of the air conditioning system provided by the invention are the same as those of the expansion valve control method, and are not described herein again.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of a conventional expansion valve;
FIG. 2 is a first flowchart of a method for controlling an expansion valve according to an embodiment of the present invention;
FIG. 3 is a second flowchart of a method for controlling an expansion valve according to an embodiment of the present invention;
fig. 4 is a third flowchart of a method for controlling an expansion valve according to an embodiment of the present invention;
FIG. 5 is a fourth flowchart of an expansion valve control method provided by an embodiment of the present invention;
FIG. 6 is a fifth flowchart of an expansion valve control method provided by an embodiment of the present invention;
FIG. 7 is a schematic diagram of an expansion valve control provided in accordance with an embodiment of the present invention;
fig. 8 is a block diagram showing the construction of an expansion valve control apparatus according to an embodiment of the present invention;
fig. 9 is a hardware architecture diagram of an expansion valve control terminal provided by an embodiment of the present invention.
Reference numerals:
110-valve needle, 120-valve seat;
130-internal channel, 210-receiving module;
220-processing module, 230-control module;
300-expansion valve control terminal, 310-transceiver;
320-processor, 330-memory;
340-bus.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an expansion valve carried by a heat exchanger included in a conventional indoor unit includes an inner passage 130 formed by a valve needle 110 and a valve seat 120; the width of the internal passage of the expansion valve may be controlled by adjusting the opening degree of the expansion valve to control the flow rate of the refrigerant in the expansion valve. When the opening degree of the expansion valve is relatively small, impurities contained in the refrigerant tend to remain in the internal passage of the expansion valve, and the particle diameter Da of the impurities contained in the refrigerant is larger than the width Db of the internal passage. If the expansion valve is closed, impurities staying in the expansion valve damage internal parts such as the valve needle 110 and the valve seat 120 in the expansion valve, causing problems in the expansion valve and causing the expansion valve to be not closed tightly. When the expansion valve is not closed tightly, noise is generated in the room, the refrigerating effect is poor, and the condensation problem is serious.
In view of the above problem, as shown in fig. 2, an embodiment of the present invention provides an expansion valve control method, including:
step S110: receiving operation control information of an indoor unit;
step S200: and analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to the operation control information of the indoor unit.
If the expansion valve of the indoor unit included in the indoor unit is in a state to be closed, it is described that the expansion valve needs to perform zero point control, and step S500 is executed. The zero point control here refers to a control process of closing the expansion valve.
If the expansion valve of the indoor unit contained in the indoor unit is not in the state of waiting to be closed, the expansion valve does not need to be subjected to zero point control.
Step S500: controlling the opening of the expansion valve to be equal to K1So that the foreign substances of the inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant.
Step S600: controlling the opening degree of the expansion valve in the state to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed, KoffFor characterizing the opening value of the expansion valve in the closed state, the opening value of the expansion valve in the state to be closed is equal to K1So that impurities of the inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant, and therefore, Koff＜K1。
Based on the expansion valve control method, before the expansion valve in the state to be closed is controlled to be closed, the opening degree value of the expansion valve in the state to be closed is controlled to be equal to K1Impurities mixed in the internal channel of the expansion valve in the state of waiting for closing are taken out from the expansion valve by the refrigerant so as to ensure that the internal channel of the expansion valve does not have retained impurities, so that when the expansion valve in the state of waiting for closing is closed, the problem that the internal parts of the expansion valve are damaged by the impurities contained in the refrigerant does not occur; in addition, the expansion valve control method provided by the embodiment of the invention avoids the internal components of the expansion valve from being damaged by the impurities contained in the refrigerant only by controlling the opening degree of the expansion valve, so that the expansion valve control method provided by the embodiment of the invention can effectively prevent the internal components of the expansion valve from being damaged by the impurities contained in the refrigerant under the condition of ensuring the normal operation of the air conditioning system.
In some embodiments, as shown in fig. 3, analyzing whether an expansion valve of an indoor unit included in the indoor unit group is in a state to be closed according to operation control information of the indoor unit group includes:
step S210: acquiring state control information of each indoor unit contained in the indoor unit group according to the operation control information of the indoor unit group;
step S220: judging the type of state control information of each indoor unit contained in the indoor unit group;
if the state control information of at least one indoor unit included in the indoor unit group is the cooling off control information, the step S230 is executed, considering that the expansion valve of any indoor unit in the indoor unit is also closed when the indoor unit in the cooling state is closed.
If the state control information of each indoor unit included in the indoor unit is heating off control information, based on the fact that the expansion valves of all the indoor units in the indoor unit are closed when all the indoor units in the heating state are closed, step S240 is executed.
If the state control information of some indoor units included in the indoor unit is the heating-off control information, based on the situation that the indoor units in the indoor unit are in the heating state are turned off, in order to avoid the influence of the refrigerant on the indoor units in normal operation after the indoor units are turned off, step S250 is executed.
Step S230: confirming that an expansion valve of at least one indoor unit is in a state to be closed;
step S240: confirming that expansion valves of indoor units contained in the indoor unit are all in a state to be closed;
step S250: and confirming that the expansion valves of all indoor units contained in the indoor unit set are not in a state to be closed.
In some embodiments, as shown in fig. 2, if the expansion valve of the indoor unit included in the indoor unit is in the to-be-closed state, the opening degree of the expansion valve in the to-be-closed state is controlled to be equal to K1The expansion valve control method further comprises the following steps:
step 120: receiving opening information of an expansion valve in a state to be closed; step S110 may be executed simultaneously with step S120, or step S120 may be executed when it is necessary to use the opening degree information of the expansion valve in the state to be closed.
Step 300: obtaining the width W of an internal channel of the expansion valve in the state to be closed according to the opening information of the expansion valve in the state to be closed;
step 400: judging whether the width W of the internal channel of the expansion valve in the state of waiting for closing is larger than or equal to the preset width W0；
If the width W of the internal channel of the expansion valve in the state of waiting for closing is larger than the preset width W0It is explained that the foreign substances can pass through the internal passage of the expansion valve in the state to be closed, at which time step S800 is performed.
If the width W of the internal channel of the expansion valve in the state of waiting for closing is less than or equal to the preset width W0The step S500 is performed when the impurities contained in the refrigerant cannot pass through the internal passage of the expansion valve in the state to be closed, so that the impurities are retained in the internal passage, and if the expansion valve in the state to be closed is directly closed, the impurities may damage internal components such as a valve needle and a valve seat of the expansion valve.
Step S800: controlling the opening of the expansion valve to be equal to KoffClosing the expansion valve in a state to be closed; due to KoffOpening degree value of expansion valve in closed state, therefore, K0＞Koff。
Illustratively, the predetermined width W is set when the inlet of the expansion valve is not provided with the filter net0Equal to the critical width of the internal channel; when the width of the internal channel is less than or equal to the critical width of the internal channel, impurities contained in the refrigerant cannot pass through the internal channel, and when the width of the internal channel is greater than the critical width of the internal channel, impurities contained in the refrigerant can pass through the internal channel.
Illustratively, the predetermined width W is provided when a filter screen is provided at the inlet of the expansion valve0The diameter is equal to the diameter of the filter screen, and when the width of the internal channel is set to Db and the diameter of the filter screen is Dc, the particle size of the impurities contained in the refrigerant is Da. When Db is more than or equal to Dc and more than Da, impurities contained in the refrigerant can pass through the filter screen and an internal channel of the expansion valve; when Dc > Da > Db, the impurities contained in the refrigerant can enter the expansion valve through the filter screen but cannot pass through the expansion valveCauses impurities contained in the refrigerant to be retained in the internal passage of the expansion valve. For example: when the aperture Dc of the filter screen is 0.1 mm-0.5 mm, the preset width W0＝0.1mm～0.5mm。
Further, when the aperture Dc of the filter net is 0.145mm, the preset width W0When the opening degree of the expansion valve is controlled so that the internal passage width W of the expansion valve is 0.145mm, as shown in fig. 7, the impurities contained in the refrigerant cannot pass through the internal passage of the expansion valve, and at this time, the opening degree of the expansion valve needs to be increased so that the internal passage width of the expansion valve is greater than 0.145mm, so that the impurities passing through the filter screen can pass through the internal passage of the expansion valve.
It will be understood that the opening value of the expansion valve when in the condition to be closed is equal to K1In the meantime, impurities of the internal passage of the expansion valve in a state of being closed are carried out from the expansion valve by the refrigerant; therefore, when the opening degree value of the expansion valve in the state to be closed is equal to K1In the meantime, the width of the internal passage of the expansion valve in a state to be closed is larger than the particle size of the impurities in the internal passage.
In some embodiments, as shown in fig. 4, the opening degree value of the expansion valve in the to-be-closed state is controlled to be equal to K1The method comprises the following steps:
step S510: obtaining the opening degree value K of the expansion valve in the state to be closed according to the opening degree information of the expansion valve in the state to be closed0；
Step S520: according to the opening value K of the expansion valve in the state to be closed0Obtaining a first opening degree adjusting parameter delta k together with a preset opening degree value Ka1，Δk1＞Ka-K0；
Step S530: adjusting parameter delta k according to first opening1And an opening value K of the expansion valve in a state to be closed0Controlling the opening degree of the expansion valve in the state to be closed from K0Conversion to K1，K1＝K0+Δk1，Δk1Can be set according to actual conditions. 0 < delta k1Is less than or equal to 10pls, and pls is the unit of opening. Because the embodiment of the invention provides expansion valve controlIn the method, the expansion valve is closed under the condition that the internal parts of the expansion valve are not damaged; that is, when the expansion valve control is performed, the expansion valve is in the closed critical state of the indoor unit, if Δ k1Too large, which causes a large amount of refrigerant to flow through the pipes of the indoor unit, and is not favorable for closing the expansion valve; when 0 < Δ k1When the pressure is less than or equal to 10pls, the impurities clamped in the internal channel can be guaranteed to be taken out by the refrigerant, and the refrigerant passing through the expansion valve can be well reduced, so that the expansion valve can be conveniently closed later.
When the expansion valve is closed too tightly, the difficulty of opening the expansion valve next time is large, and the service life of the expansion valve is also influenced, based on this, as shown in fig. 5, the opening degree value of the expansion valve in the state to be closed is controlled from K1Conversion to KoffThe method comprises the following steps:
step S610: controlling the opening of the expansion valve from K1Conversion to Kmin，KminIs the minimum opening degree of the expansion valve in a state to be closed, and therefore, K1＞Kmin。
Step S620: controlling the opening of the expansion valve from KminConversion to Koff，Kmin＜Koff＜K1，Koff＝Kmin+Δk2，Δk2And adjusting the parameter for the second opening degree. Here Δ k2Can be set according to the requirement of tightness of the closing of the expansion valve. When the expansion valve is required to be closed tightly, KoffIs relatively small, when the expansion valve is required to be closed relatively loosely, KoffIs relatively large. But at least ensure Δ k2Is more than 0 to avoid the inconvenience of opening the expansion valve after closing.
Similarly, as shown in fig. 6, the above-mentioned control of the opening degree value of the expansion valve in the state to be closed is equal to KoffThe method comprises the following steps:
step S810: obtaining the opening degree value K of the expansion valve in the state to be closed according to the opening degree information of the expansion valve in the state to be closed0；
Step S820: controlling the opening of the expansion valve from K0Conversion to Kmin，KminThe minimum opening degree of the expansion valve in a state to be closed;
step S830: controlling the opening of the expansion valve from KminConversion to Koff，Kmin＜Koff＜K0，Koff＝Kmin+Δk2，Δk2And adjusting the parameter for the second opening degree.
In some embodiments, when the indoor unit set is operated with a small load, the opening degree of the expansion valve in the indoor unit in the operating state is generally small, and impurities contained in the refrigerant are easily retained in the internal passage of the expansion valve in the indoor unit in the operating state; when the indoor unit set is in heavy load operation, the opening degree of the expansion valve in the indoor unit set in an operating state is relatively large, and impurities contained in the refrigerant cannot be retained in an internal channel of the expansion valve. Based on this, as shown in fig. 2, if the width W of the internal passage of the expansion valve in the state to be closed is larger than the preset width W0Controlling the opening of the expansion valve to be in a closed state to be equal to KoffThe expansion valve control method further comprises the following steps:
step S130: the load information of the indoor unit group is received, and the step S110 and/or the step S120 may be executed simultaneously with the step S130, or the step S130 may be executed when the load information of the indoor unit group is required to be used.
Step S700: judging whether the load F of the indoor unit is greater than or equal to a load threshold F according to the load information of the indoor unitt；
If the load F of the indoor unit is more than or equal to the load threshold value FtStep S800 is performed.
If the load F of the indoor unit is less than the load threshold FtStep S900 is executed.
Step S900: controlling the opening of the expansion valve of the indoor unit in operation to be equal to K1And since the opening value of the expansion valve is equal to K1In the meantime, the foreign substances in the inner passage of the expansion valve are carried out of the expansion valve by the refrigerant, so that the normal operation of the indoor unit in the operation state can be ensured, and thus, the step S900, step S600 is executed to continue controlling the opening degree of the expansion valve to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed.
From the above, it can be seen that when the load F of the indoor unit is greater than or equal to the load threshold FtAt the time of closing, it is explained that the foreign substances contained in the refrigerant are not caught in the inner passage of the expansion valve in the state of being closed, and thus, the opening degree value of the expansion valve in the state of being closed is controlled to be equal to KoffTherefore, the expansion valve in the state of waiting for closing is closed, and the problem that the internal parts of the expansion valve in the state of waiting for closing are damaged by the impurities contained in the refrigerant can not occur. When the load F of the indoor unit is less than the load threshold FtIn the description, the impurities contained in the refrigerant are easily accumulated in the inner passage of the expansion valve of the indoor unit in the operating state, and if the expansion valve of the indoor unit in the operating state is closed, the impurities contained in the refrigerant may damage the inner parts of the expansion valve of the indoor unit in the operating state. Therefore, the load F of the indoor unit is less than the load threshold FtControlling the opening degree value of an expansion valve of an indoor unit in an operating state in the indoor unit set to be equal to K1Then controlling the opening degree value of the expansion valve in the state to be closed from K1Conversion to Koff. Therefore, the expansion valve control method provided by the embodiment of the invention can further ensure that the expansion valve is closed under the condition that the internal parts of the expansion valve are not damaged.
As shown in fig. 2 and 8, an embodiment of the present invention further provides an expansion valve control device, including:
a receiving module 210, configured to receive operation control information of the indoor unit;
the processing module 220 is configured to analyze whether an expansion valve of an indoor unit included in the indoor unit is in a state to be closed according to operation control information of the indoor unit;
a control module 230, configured to control an opening value of an expansion valve in a to-be-closed state to be equal to K when the expansion valve of an indoor unit included in the indoor unit is in the to-be-closed state1To makeImpurities in the internal channel of the expansion valve in a state to be closed are taken out of the expansion valve by the refrigerant; controlling the opening degree of the expansion valve in the state to be closed from K1Conversion to KoffSo that the expansion valve in the state to be closed is closed, KoffIs an opening value of the expansion valve that characterizes the closed state.
The above-mentioned expansion valve control device can be implemented by referring to the above description of the expansion valve control method.
Compared with the prior art, the beneficial effects of the expansion valve control device provided by the embodiment of the invention are the same as those of the expansion valve control method, and are not repeated herein.
In some embodiments, as shown in fig. 3 and fig. 8, the processing module 220 is specifically configured to obtain status control information of each indoor unit included in the indoor unit group according to the operation control information of the indoor unit group; judging the type of state control information of each indoor unit contained in the indoor unit group;
if the state control information of at least one indoor unit contained in the indoor unit set is refrigeration closing control information, confirming that an expansion valve of the at least one indoor unit is in a state to be closed;
if the state control information of each indoor unit contained in the indoor unit is heating closing control information, confirming that the expansion valves of the indoor units contained in the indoor unit are all in a state to be closed;
and if the state control information of part of the indoor units contained in the indoor unit is heating closing control information, confirming that the expansion valves of all the indoor units contained in the indoor unit are not in a state to be closed.
In some embodiments, as shown in fig. 2 and 8, in an indoor unit of an indoor unit having an expansion valve to be closed, the expansion valve to be closed is controlled to have an opening degree equal to K1The receiving module 210 is further configured to receive opening information of the expansion valve to be closed; the processing module 220 is further configured to obtain the expansion valve in the to-be-closed state according to the opening degree information of the expansion valve in the to-be-closed stateThe internal channel width W of the expansion valve; judging whether the width W of the internal channel of the expansion valve in the state of waiting for closing is larger than the preset width W0；
The control module 230 is further configured to control the width W of the internal passage of the expansion valve to be closed to be greater than the preset width W0While controlling the opening degree value of the expansion valve in the state to be closed to be equal to KoffClosing the expansion valve in a state to be closed; the width W of the internal passage of the expansion valve in the state to be closed is less than or equal to the preset width W0When the opening degree value of the expansion valve in the state to be closed is controlled to be equal to K1。
In some embodiments, as shown in fig. 4 and 8, the processing module 220 is further configured to obtain an opening degree value K of the expansion valve to be closed according to the opening degree information of the expansion valve to be closed0(ii) a According to the opening value K of the expansion valve in the state to be closed0Obtaining a first opening degree adjusting parameter delta k together with a preset opening degree value Ka1，Δk1＞Ka-K0The preset opening value Ka means that the width W of the internal passage of the expansion valve in the state to be closed is equal to the preset width W0Then, the opening value of the expansion valve in a state of waiting for closing;
the control module 230 is specifically configured to adjust the parameter Δ k according to the first opening degree1And an opening value K of the expansion valve in a state to be closed0Controlling the opening degree of the expansion valve in the state to be closed from K0Conversion to K1，K1＝K0+Δk1。
In some embodiments, as shown in fig. 2 and 8, if the width W of the internal passage of the expansion valve in the state to be closed is larger than the preset width W0Controlling the opening of the expansion valve to be in a closed state to be equal to KoffThe receiving module 210 is further configured to receive load information of the indoor units; the processing module 220 is further configured to determine whether the load F of the indoor unit is greater than or equal to a load threshold F according to the load information of the indoor unitt；
The control module 230 is further configured to control the load F of the indoor unit to be greater thanEqual to the load threshold FtWhen the opening degree value of the expansion valve in the state to be closed is controlled to be equal to Koff(ii) a The load F of the indoor unit is less than a load threshold FtControlling the opening degree value of an expansion valve of an indoor unit in an operating state in the indoor unit set to be equal to K1Performing control of an opening value of the expansion valve in a state to be closed from K1Conversion to Koff。
In some embodiments, as shown in fig. 6 and 8, the processing module 220 is further configured to obtain an opening degree value K of the expansion valve to be closed according to the opening degree information of the expansion valve to be closed0；
The control module 230 is specifically configured to control the opening degree of the expansion valve to be closed from K0Conversion to KminControlling the opening of the expansion valve in the closed state from KminConversion to Koff，Kmin＜Koff＜K0，Koff＝Kmin+Δk2，Δk2For a second opening degree adjustment parameter, KminIs the minimum opening degree of the expansion valve in the state to be closed.
In some embodiments, as shown in fig. 5 and 8, the control module 230 is specifically configured to control the opening degree of the expansion valve to be closed from K1Conversion to KminControlling the opening of the expansion valve in the closed state from KminConversion to Koff，Kmin＜Koff＜K1，Koff＝Kmin+Δk2，Δk2For a second opening degree adjustment parameter, KminIs the minimum opening degree of the expansion valve in the state to be closed.
The embodiment of the invention also provides an air conditioning system which comprises the expansion valve control device, wherein the expansion valve control device is used for controlling the expansion valve contained in the indoor unit.
Compared with the prior art, the beneficial effects of the air conditioning system provided by the embodiment of the invention are the same as those of the expansion valve control method, and are not repeated herein.
The present invention also provides a computer storage medium for storing one or more computer instructions, the computer software instructions comprising a computer program designed to perform the above-described expansion valve control method.
Compared with the prior art, the beneficial effects of the computer storage medium provided by the embodiment of the invention are the same as those of the expansion valve control method, and are not repeated herein.
As shown in fig. 9, an embodiment of the present invention further provides an expansion valve control terminal 300, where the expansion valve control terminal 300 includes a processor 320, a transceiver 310, a memory 330, and a bus 340, and the processor 320, the transceiver 310, and the memory 330 communicate with each other through the bus 340. Wherein the content of the first and second substances,
the memory 330 is used for storing a plurality of instructions to implement the above-mentioned outdoor unit protection method, and the processor 320 executes the plurality of instructions to implement the above-mentioned outdoor unit protection method.
The processor 320 according to the embodiment of the present invention may be a single processor, or may be a general term for multiple processing elements. For example, the processor 320 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention, such as: one or more microprocessors (digital signal processors, DSP for short), or one or more Field Programmable Gate arrays (FPGA for short).
The memory 330 may be a single storage device or a combination of storage elements, and is used for storing executable program codes and the like. And the memory 330 may include a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as a magnetic disk memory, Flash memory (Flash), and the like.
The bus 340 may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus 340 may be divided into an address bus, a data bus, a control bus, and the like. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (14)

1. An expansion valve control method, comprising:
receiving operation control information of an indoor unit;
analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to operation control information of the indoor unit;
if the expansion valve of the indoor unit in the indoor unit is in the state of waiting to close, controlling the opening value of the expansion valve in the state of waiting to close to be equal toK 1So thatImpurities of an inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant;
controlling the opening degree of the expansion valve in a state to be closedK 1To be converted intoK off So that the expansion valve in the state to be closed is closed,K off an opening value of the expansion valve representing a closed state;
if the expansion valve of the indoor unit in the indoor unit is in the state of waiting to close, controlling the opening value of the expansion valve in the state of waiting to close to be equal toK 1Before, the expansion valve control method further includes:
receiving opening information of an expansion valve in a state to be closed;
obtaining the width of the internal channel of the expansion valve in the state of waiting for closing according to the opening information of the expansion valve in the state of waiting for closingW；
Determining the width of an internal passage of an expansion valve in a state to be closedWWhether it is larger than the preset widthW 0；
Width of internal passage of expansion valve if in the state of waiting to be closedWGreater than a predetermined widthW 0Controlling the opening degree of the expansion valve in a state to be closed to be equal toK off Closing the expansion valve in a state to be closed;
width of internal passage of expansion valve if in the state of waiting to be closedWLess than or equal to the preset widthW 0Performing control of an opening value of the expansion valve in a state to be closed to be equal toK 1。
2. An expansion valve control method according to claim 1,
the analyzing whether an expansion valve of an indoor unit included in the indoor unit is in a state of waiting for closing according to the operation control information of the indoor unit includes:
acquiring state control information of each indoor unit contained in the indoor unit group according to the operation control information of the indoor unit group;
judging the type of state control information of each indoor unit contained in the indoor unit group;
if the state control information of at least one indoor unit contained in the indoor unit set is refrigeration closing control information, confirming that an expansion valve of the at least one indoor unit is in a state to be closed;
if the state control information of each indoor unit contained in the indoor unit is heating closing control information, confirming that the expansion valves of the indoor units contained in the indoor unit are all in a state to be closed;
and if the state control information of part of the indoor units contained in the indoor unit is heating closing control information, confirming that the expansion valves of all the indoor units contained in the indoor unit are not in a state to be closed.
3. An expansion valve control method according to claim 1, wherein the opening degree value of the expansion valve controlled to be in a state of being closed is equal toK 1The method comprises the following steps:
obtaining the opening degree value of the expansion valve in the state to be closed according to the opening degree information of the expansion valve in the state to be closedK 0；
According to the opening degree of the expansion valve in the state to be closedK 0And a predetermined opening valueKaObtaining a first opening degree adjusting parameter deltak 1Preset opening valueKaRefers to the internal passage width of the expansion valve in the state of being closedWIs equal to the preset widthW 0Opening value, delta, of the expansion valve to be closedk 1＞Ka-K 0；
Adjusting parameter delta according to the first opening degreek 1And the opening degree value of the expansion valve in a state to be closedK 0Controlling the opening degree of the expansion valve in a state to be closedK 0To be converted intoK 1，K 1=K 0+Δk 1。
4. An expansion valve control method according to claim 1, wherein the valve is in a standby stateInternal passage width of closed state expansion valveWGreater than a predetermined widthW 0Controlling the opening degree of the expansion valve in a state to be closed to be equal toK off Before, the expansion valve control method further includes:
receiving load information of an indoor unit;
judging the load of the indoor unit according to the load information of the indoor unitFWhether or not it is greater than or equal to the load thresholdF t ；
If the load of the indoor unitFGreater than or equal to the load thresholdF t Performing control of an opening value of the expansion valve in a state to be closed to be equal toK off ；
If the load of the indoor unitFLess than the load thresholdF t Controlling the opening degree of an expansion valve of an indoor unit in an operating state in the indoor unit set to be equal toK 1Performing control of an opening value of the expansion valve in a state to be closedK 1To be converted intoK off 。
5. An expansion valve control method according to claim 1, wherein the opening degree value of the expansion valve controlled to be in a state of being closed is equal toK off The method comprises the following steps:
obtaining the opening degree value of the expansion valve in the state to be closed according to the opening degree information of the expansion valve in the state to be closedK 0；
Controlling the opening degree of an expansion valve in a state to be closed fromK 0To be converted intoK min ，K min The minimum opening degree of the expansion valve in a state to be closed;
controlling the opening degree of an expansion valve in a state to be closed fromK min To be converted intoK off ，K min ＜K off ＜K 0，K off =K min +Δk 2，Δk 2And adjusting the parameter for the second opening degree.
6. An expansion valve control method according to claim 1, wherein the control of the opening degree value of the expansion valve in a state to be closed is performed fromK 1To be converted intoK off The method comprises the following steps:
controlling the opening degree of an expansion valve in a state to be closed fromK 1To be converted intoK min ，K min The minimum opening degree of the expansion valve in a state to be closed;
controlling the opening degree of an expansion valve in a state to be closed fromK min To be converted intoK off ，K min ＜K off ＜K 1，K off =K min +Δk 2，Δk 2And adjusting the parameter for the second opening degree.
7. An expansion valve control device, comprising:
the receiving module is used for receiving operation control information of the indoor unit;
the processing module is used for analyzing whether an expansion valve of an indoor unit contained in the indoor unit is in a state to be closed or not according to the operation control information of the indoor unit;
a control module for controlling the opening value of the expansion valve in the state to be closed to be equal to that of the expansion valve of the indoor unit in the indoor unitK 1So that impurities of an inner passage of the expansion valve in a state to be closed are carried out of the expansion valve by the refrigerant; controlling the opening degree of the expansion valve in the state to be closed from K1To be converted intoK off So that the expansion valve in the state to be closed is closed,K off an opening value of the expansion valve representing a closed state;
controlling an expansion valve of an indoor unit included in the indoor unit to be in a state of waiting for closingOpening value of expansion valve equal toK 1The receiving module is further used for receiving opening information of the expansion valve in a state to be closed; the processing module is also used for obtaining the width of the internal channel of the expansion valve in the state of waiting to close according to the opening information of the expansion valve in the state of waiting to closeW(ii) a Determining the width of an internal passage of an expansion valve in a state to be closedWWhether it is larger than the preset widthW 0；
The control module is also used for controlling the internal channel width of the expansion valve in a state of waiting to be closedWGreater than a predetermined widthW 0While controlling the opening degree value of the expansion valve in the state of waiting to close to be equal toK off Closing the expansion valve in a state to be closed; internal passage width of expansion valve in state to be closedWLess than or equal to the preset widthW 0When the opening degree value of the expansion valve in the state to be closed is controlled to be equal toK 1。
8. The expansion valve control apparatus according to claim 7, wherein the processing module is specifically configured to obtain status control information of each indoor unit included in the indoor unit group from operation control information of the indoor unit group; judging the type of state control information of each indoor unit contained in the indoor unit group;
if the state control information of at least one indoor unit contained in the indoor unit set is refrigeration closing control information, confirming that an expansion valve of the at least one indoor unit is in a state to be closed;
if the state control information of each indoor unit contained in the indoor unit is heating closing control information, confirming that the expansion valves of the indoor units contained in the indoor unit are all in a state to be closed;
and if the state control information of part of the indoor units contained in the indoor unit is heating closing control information, confirming that the expansion valves of all the indoor units contained in the indoor unit are not in a state to be closed.
9. According toThe expansion valve control apparatus according to claim 7, wherein the processing module is further configured to obtain an opening degree value of the expansion valve to be closed according to the opening degree information of the expansion valve to be closedK 0(ii) a According to the opening degree of the expansion valve in the state to be closedK 0And a predetermined opening valueKaObtaining a first opening degree adjusting parameter deltak 1，Δk 1＞Ka-K 0Preset opening valueKaRefers to the internal passage width of the expansion valve in the state of being closedWIs equal to the preset widthW 0Then, the opening value of the expansion valve in a state of waiting for closing;
the control module is specifically configured to adjust a parameter Δ according to the first opening degreek 1And the opening degree value of the expansion valve in a state to be closedK 0Controlling the opening degree of the expansion valve in a state to be closedK 0To be converted intoK 1，K 1=K 0+Δk 1。
10. The expansion valve control apparatus according to claim 7, wherein the internal channel width of the expansion valve if in the state to be closedWGreater than a predetermined widthW 0Controlling the opening degree of the expansion valve in a state to be closed to be equal toK off The receiving module 210 is further configured to receive load information of the indoor units;
the processing module is also used for judging the load of the indoor unit according to the load information of the indoor unitFWhether or not it is greater than or equal to the load thresholdF t ；
The control module is also used for loading the indoor unitFGreater than or equal to the load thresholdF t When the opening degree value of the expansion valve in the state to be closed is controlled to be equal toK off (ii) a Load on the indoor unitFLess than the load thresholdF t Controlling the opening degree value of an expansion valve of an indoor unit in an operating state in the indoor unit set to be equal toK 1Reception ofFor controlling the opening of the expansion valve to be closedK 1To be converted intoK off 。
11. The expansion valve control apparatus according to claim 7, wherein the processing module is further configured to obtain an opening degree value of the expansion valve to be closed according to the opening degree information of the expansion valve to be closedK 0；
The control module is used for controlling the opening value of the expansion valve in a state of waiting to be closedK 0To be converted intoK min Controlling the opening degree of the expansion valve in a state to be closed fromK min To be converted intoK off ，K min ＜K off ＜K 0，K off =K min +Δk 2，Δk 2Is a second opening degree adjustment parameter for the second opening degree,K min is the minimum opening degree of the expansion valve in the state to be closed.
12. The expansion valve control apparatus according to claim 7, wherein the control module is specifically configured to control an opening value of the expansion valve in a state to be closed fromK 1To be converted intoK min Controlling the opening degree of the expansion valve in a state to be closed fromK min To be converted intoK off ，K min ＜K off ＜K 1，K off =K min +Δk 2，Δk 2Is a second opening degree adjustment parameter for the second opening degree,K min is the minimum opening degree of the expansion valve in the state to be closed.
13. A computer storage medium storing one or more computer instructions, the computer software instructions comprising a computer program designed to perform the expansion valve control method of any of claims 1-6.
14. An air conditioning system comprising the expansion valve control apparatus according to any one of claims 7 to 12.
CN201811603443.4A 2018-12-26 2018-12-26 Expansion valve control method and device and air conditioning system Active CN109682022B (en)

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