CN115289651B - Air conditioner - Google Patents
Air conditioner Download PDFInfo
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- CN115289651B CN115289651B CN202210923121.8A CN202210923121A CN115289651B CN 115289651 B CN115289651 B CN 115289651B CN 202210923121 A CN202210923121 A CN 202210923121A CN 115289651 B CN115289651 B CN 115289651B
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- compressor
- refrigerant
- pressure
- heat exchanger
- air conditioner
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- 239000003507 refrigerant Substances 0.000 claims abstract description 126
- 238000011084 recovery Methods 0.000 claims abstract description 76
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000003828 downregulation Effects 0.000 claims 1
- 238000004880 explosion Methods 0.000 description 8
- 238000004891 communication Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000005437 stratosphere Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- F24F11/70—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
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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
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
本发明公开了一种空调器，其包括室内机、压缩机、四通阀、室内换热器、室外换热器以及控制器；室内机出风口设置有冷媒检测件；四通阀与压缩机的冷媒出口之间设置有高压检测件，四通阀与压缩机的冷媒入口之间形成有低压检测件；室外换热器和室内换热器之间设置有电子膨胀阀；控制器配置为响应于冷媒检测件检测到的泄露信号，控制四通阀以使室内换热器作为蒸发器工作；控制压缩机在预设回收周期内以预设频率工作，接收高压检测件和低压检测件的压力信号，控制电子膨胀阀在预设回收周期内的开度；本申请所涉及的空调其所以能够在冷媒泄漏时通过自身的控制调节来回收室内侧泄露的冷媒，从而降低冷媒的使用风险，提高安全性能，实用性强。
The present invention discloses an air conditioner, which comprises an indoor unit, a compressor, a four-way valve, an indoor heat exchanger, an outdoor heat exchanger and a controller; a refrigerant detection component is arranged at an air outlet of the indoor unit; a high-pressure detection component is arranged between the four-way valve and the refrigerant outlet of the compressor, and a low-pressure detection component is formed between the four-way valve and the refrigerant inlet of the compressor; an electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger; the controller is configured to control the four-way valve to make the indoor heat exchanger work as an evaporator in response to a leakage signal detected by the refrigerant detection component; the compressor is controlled to work at a preset frequency within a preset recovery cycle, the pressure signals of the high-pressure detection component and the low-pressure detection component are received, and the opening of the electronic expansion valve within the preset recovery cycle is controlled; the air conditioner involved in the present application can recover the refrigerant leaked from the indoor side through its own control and adjustment when the refrigerant leaks, thereby reducing the risk of using the refrigerant, improving the safety performance, and having strong practicality.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to an air conditioner.
Background
The types of refrigerants used in conventional air conditioners are generally R22 and R410A, but since the high ODP and the high GWP (ODP is a value representing global warming potential, which is a value describing ozone-destroying ability of substances to the stratosphere, and GWP is a value representing and comparing the magnitude of ozone-depleting substances affecting global climate warming), which are liable to cause a greenhouse effect and destroy the environment, environment-friendly refrigerants such as R32, R290, etc. are gradually replacing them as air conditioning refrigerants.
R32 and R290 have less flushing quantity and lower cost, but R32 and R290 refrigerants have combustibility and explosiveness, and in the use process, once the refrigerants leak indoors to reach a certain concentration, the danger of explosion exists, so that the detection of the leakage and the timely recovery of the refrigerants of R32 and R290 are important measures for the safe use of the air conditioner;
In the prior art, a recovery mode of leaked refrigerant is also available, but the problems of complex components and parts, high failure rate, system damage or incomplete recovery caused by suddenly starting and stopping the compressor in the refrigerant recovery process are generally existed.
Disclosure of Invention
The invention aims to provide an air conditioner, which solves the problem that the prior air conditioner in the prior art causes risks such as combustion explosion due to untimely detection and recovery after cooling leaks indoors, and has great potential safety hazard in the use process, thereby threatening the safety of users.
In order to achieve the aim of the invention, the invention is realized by adopting the following technical scheme:
the invention provides an air conditioner, which comprises:
The air outlet of the indoor unit is provided with a refrigerant detection piece;
a compressor on which a refrigerant outlet and a refrigerant inlet are formed;
the four-way valve is provided with a high-pressure detection part between the four-way valve and a refrigerant outlet of the compressor, and a low-pressure detection part is formed between the four-way valve and a refrigerant inlet of the compressor;
the indoor heat exchanger is positioned in the indoor unit and is communicated with the compressor through a four-way valve;
the outdoor heat exchanger is communicated with the compressor through a four-way valve, and an electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger;
a controller configured to:
And controlling the compressor to work at a preset frequency in a preset recovery period, receiving pressure signals of the high-pressure detection part and the low-pressure detection part, and controlling the opening of the electronic expansion valve in the preset recovery period.
In some embodiments of the present application, a four-way valve includes an input port in communication with a refrigerant outlet of the compressor, a return port in communication with a refrigerant inlet of the compressor, a first port in communication with the indoor heat exchanger, and a second port in communication with the outdoor heat exchanger.
In some embodiments of the present application, the refrigerant detecting element is configured to detect a concentration of a refrigerant at an indoor side, and when the concentration of the refrigerant is greater than a preset concentration, the controller communicates a first port of the four-way valve with the return port, and communicates a second port with the input port, the outdoor heat exchanger is used as a condenser, and the indoor heat exchanger is used as an evaporator, and otherwise, the air conditioner continues to operate according to a user setting mode.
In some embodiments of the present application, the operation time of the air conditioner in the refrigerant recovery stage includes a plurality of recovery cycles, and the number of recovery cycles and the duration of each recovery cycle are determined according to the actual requirements of the user.
In some embodiments of the present application, when the refrigerant detecting member detects that the indoor side refrigerant concentration is greater than the preset concentration, the controller controls the frequency of the compressor in the first recovery period T1 to be F1, f1=fmax (Fmax is the highest operating frequency of the compressor), and controls the opening of the electronic expansion valve in the first recovery period T1 to be E1;
In the first recovery period T1, the high pressure detecting element detects the outdoor side pressure Pd in real time, and when the outdoor side pressure Pd is greater than a preset outdoor side maximum pressure Pdmax, the frequency F1 of the compressor is gradually reduced to f1=f1-nx until the outdoor side pressure Pd is not greater than the preset outdoor side maximum pressure Pdmax, and at this time, the compressor continues to continuously operate at the adjusted frequency F1;
in the case where the outdoor side pressure Pd is not greater than the outdoor side maximum pressure Pdmax, the compressor frequency is continuously operated at f1=fmax until the low pressure detecting member detects that the indoor side pressure Pl is less than the preset indoor side minimum pressure Plmin or the operation time exceeds the first recovery period T1.
In some embodiments of the application, during an nth recovery period Tn, the controller controls the operating frequency Fn of the compressor to be F1- (n-1) F, where F is the variation of the compressor in different recovery periods;
The controller controls the opening En of the electronic expansion valve in the nth recovery period Tn to be E1- (n-1) E, wherein E is the variation of the electronic expansion valve in different recovery periods;
when the low pressure detecting member detects that the indoor side pressure Pl is smaller than a preset indoor side minimum pressure Plmin, the controller controls the compressor to be turned off, and the opening of the electronic expansion valve is set to 0.
In some embodiments of the present application, in the refrigerant recovery process, an opening E1 of the electronic expansion valve is smaller than an opening E0 of the electronic expansion valve in a normal operation process of the air conditioner, the high pressure detecting element is a high pressure sensor, and the low pressure detecting element is a low pressure sensor.
In some embodiments of the present application, a check valve is formed between the four-way valve and the refrigerant inlet of the compressor, so as to prevent the refrigerant from flowing back into the indoor unit from the refrigerant inlet of the compressor.
In some embodiments of the application, a liquid side shut-off valve is disposed between the electronic expansion valve and the indoor heat exchanger.
In some embodiments of the application, a gas side shut-off valve is disposed between the indoor heat exchanger and the compressor.
Compared with the prior art, the invention has the advantages and positive effects that:
According to the air conditioner, after the refrigerant detection part detects that the refrigerant of the indoor unit leaks, the controller controls the air conditioner to start the refrigerant recovery process, the electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger, the specific working frequency and the specific opening degree of the compressor and the electronic expansion valve are gradually reduced in different recovery periods, the refrigerant recovery effect is improved, the problems of system damage or incomplete recovery and the like caused by sudden switching are avoided, and therefore the use risk of the refrigerant is reduced, the safety performance is improved, and the practicability is strong.
The setting of the low-pressure switch can prevent air from entering the compressor, and avoid the danger of explosion and the like of the air conditioner caused by mixing the air with inflammable and explosive refrigerants such as R32, R290 and the like in the compressor, and the high-pressure switch can prevent the high pressure caused by high-frequency operation of the compressor from being too high, and avoid the risks of leakage and explosion of pipelines.
Other features and advantages of the present invention will become apparent upon review of the detailed description of the invention in conjunction with the drawings.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system schematic diagram of an embodiment of an air conditioner according to the present invention;
FIG. 2 is a schematic diagram illustrating a refrigerant flow direction of the air conditioner according to the present invention during a refrigerant recovery process;
FIG. 3 is a schematic view showing a partial structure of an outdoor unit of an air conditioner;
Fig. 4 is a schematic view of an external structure of an outdoor unit of an air conditioner;
FIG. 5 is a schematic diagram of a refrigerant recovery control flow of an air conditioner;
in the drawing the view of the figure,
10. A compressor;
20. four-way valve, 21, input port, 22, return port, 23, first port, 24, second port;
30. 31, an indoor fan;
40. an outdoor heat exchanger, an outdoor fan and a fan;
50. An electronic expansion valve;
60. a low pressure detecting member;
70. A high-pressure detecting member;
80. A one-way valve;
91. a liquid side stop valve;
92. and an air side stop valve.
Detailed Description
The following description of the embodiments of the present application 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 application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, directly connected, or indirectly connected via an intermediary. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
An air conditioner includes an indoor unit installed in an indoor space. An indoor unit connected to an outdoor unit (not shown) installed in the outdoor space through a pipe. The outdoor unit may be provided therein with a compressor, an outdoor heat exchanger, an outdoor fan, an expander, and the like of the refrigeration cycle, and the indoor unit may be provided therein with an indoor heat exchanger and an indoor fan.
The air conditioner performs a refrigerating cycle of the air conditioner by using a compressor, a condenser, an expansion valve, and an evaporator. The refrigeration cycle includes a series of processes involving compression, condensation, expansion, and evaporation, and refrigerating or heating an indoor space.
The low-temperature low-pressure refrigerant enters the compressor, the compressor compresses the refrigerant gas into a high-temperature high-pressure state, and the compressed refrigerant gas is discharged. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.
The expansion valve expands the liquid-phase refrigerant in a high-temperature and high-pressure state formed by condensation in the condenser into a low-pressure liquid-phase refrigerant. The evaporator evaporates the refrigerant expanded in the expansion valve and returns the refrigerant gas in a low-temperature and low-pressure state to the compressor. The evaporator may achieve a cooling effect by exchanging heat with a material to be cooled using latent heat of evaporation of a refrigerant. The air conditioner may adjust the temperature of the indoor space throughout the cycle.
An outdoor unit of an air conditioner refers to a portion of a refrigeration cycle including a compressor and an outdoor heat exchanger, an indoor unit of the air conditioner includes an indoor heat exchanger, and an expansion valve may be provided in the indoor unit or the outdoor unit.
The indoor heat exchanger and the outdoor heat exchanger function as a condenser or an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater of a heating mode, and when the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler of a cooling mode.
The air conditioner pipe includes a liquid pipe through which condensed liquid refrigerant flows, and a gas pipe through which vaporized gas refrigerant flows.
The liquid pipe and the gas pipe are provided at one side of the heat exchanger so as to guide the refrigerant into the indoor heat exchanger or discharge the refrigerant from the outdoor heat exchanger. For example, when the air conditioner performs a cooling operation, a liquid pipe provided in the indoor unit may guide a refrigerant into the indoor heat exchanger, and a gas pipe may guide discharge of a gas refrigerant evaporated in the indoor heat exchanger.
As shown in fig. 1-5, the present application provides an air conditioner, which comprises an indoor unit and an outdoor unit, wherein an air return opening and an air outlet are formed on the indoor unit, a refrigerant detecting member is arranged on the air outlet of the indoor unit, when refrigerant leaks in the indoor unit, the refrigerant detecting member timely detects the refrigerant and feeds the refrigerant back to the air conditioner, and the air conditioner correspondingly starts a refrigerant recovery process.
The air conditioner comprises a refrigerant circulation system composed of a compressor 10, a four-way valve 20, an indoor heat exchanger 30, an outdoor heat exchanger 40, an electronic expansion valve 50 and the like, wherein the indoor heat exchanger 30 is positioned in an indoor unit, and the outdoor heat exchanger 40 is positioned in an outdoor unit.
A liquid-side shutoff valve 91 is provided between the electronic expansion valve 50 and the indoor heat exchanger 30, and a gas-side shutoff valve 92 is provided between the indoor heat exchanger 30 and the compressor 10.
The indoor heat exchanger 30 is communicated with the compressor 10 through the four-way valve 20, the outdoor heat exchanger 40 is communicated with the compressor 10 through the four-way valve 20, and the electronic expansion valve 50 is positioned between the outdoor heat exchanger 40 and the indoor heat exchanger 30.
The compressor 10 is provided with a refrigerant outlet and a refrigerant inlet, the compressor 10 is a heart of a refrigerating system, low-temperature and low-pressure refrigerant gas is sucked in from the refrigerant inlet, a piston is driven to compress the refrigerant gas through motor operation, and then high-temperature and high-pressure refrigerant is output from the refrigerant outlet to provide power for refrigerating circulation.
The four-way valve 20 includes an input port 21, a return port 22, a first port 23, and a second port 24, the input port 21 communicates with a refrigerant outlet of the compressor 10, the return port 22 communicates with a refrigerant inlet of the compressor 10, the first port 23 communicates with the indoor heat exchanger 30, and the second port 24 communicates with the outdoor heat exchanger 40.
A high pressure detecting member 70 for detecting the fluid pressure in the outdoor heat exchanger 40 is provided between the four-way valve 20 and the refrigerant outlet of the compressor 10, and a low pressure detecting member 60 for detecting the fluid pressure in the indoor heat exchanger 30 is provided between the four-way valve 20 and the refrigerant inlet of the compressor 10.
The controller is electrically connected to the refrigerant sensing element, the compressor 10, the electronic expansion valve 50, the high pressure sensing element 70, and the low pressure sensing element 60, and is configured to respond to a leakage signal detected by the refrigerant sensing element.
When the refrigerant detecting piece detects that the air outlet of the indoor unit outputs the refrigerant and the content of the refrigerant is higher than the preset content, a refrigerant leakage signal is transmitted to the controller.
The controller controls the air conditioner to enter a refrigerant recovery state, otherwise, the air conditioner continues to operate according to a user setting mode.
The indoor unit also comprises an indoor fan 31, the outdoor unit comprises an outdoor fan 31, and the indoor fan 31 and the outdoor fan 31 are also connected with the controller.
When the indoor unit leaks, the controller controls the indoor fan 31 to operate at the highest rotation speed, the indoor fan 31 can blow off the leaked refrigerant in the outdoor unit into the air, and the refrigerant concentration in the environment is reduced, so that the adverse effect caused by the refrigerant leakage is reduced, and the safety of the air conditioner in the use process is improved.
The refrigerant recovery state is a refrigeration process, and at this time, the controller controls the input port 21 of the four-way valve 20 to communicate with the second port 24, and the return port 22 to communicate with the first port 23.
At this time, the high-temperature and high-pressure refrigerant output from the compressor 10 is sent to the outdoor heat exchanger 40, and the outdoor heat exchanger 40 functions as a condenser and the indoor heat exchanger 30 functions as an evaporator;
The controller controls the compressor 10 to operate at a preset frequency for a preset recovery period.
The controller is also used for receiving pressure signals of the high pressure detecting member 70 and the low pressure detecting member 60 and controlling the opening degree of the electronic expansion valve 50 in a preset recovery period.
The preset operation time of the refrigerant recovery stage of the air conditioner comprises a plurality of recovery periods, specifically a first recovery period T1, a second recovery period T2, a third recovery period T3 and the like, and the number of the recovery periods and the duration of each recovery period are determined according to the actual requirements of a user, for example, t1=2min and t2=2min.
Referring to fig. 5, specifically, when the refrigerant detecting member detects that the indoor side refrigerant concentration is greater than the preset concentration, the controller controls the frequency of the compressor 10 in the first recovery period T1 to be F1.
Initially, the frequency F1 of the compressor 10 is set to Fmax (Fmax is the highest operating frequency of the compressor 10), the opening degree of the electronic expansion valve 50 in the first recovery period T1 is controlled to be E1,
For example, fmax=90 hz and e1=150 steps are defined, and it should be noted that the opening E1 of the electronic expansion valve 50 is smaller than the opening E0 of the electronic expansion valve 50 in the normal working state, and the value of E0 is about 200 to 300 steps.
The value of the specific Fmax is determined according to the actual maximum operating frequency of the compressor.
In the first recovery period T1, the high pressure detecting unit 70 detects the outdoor side pressure Pd in real time, and when the outdoor side pressure Pd is greater than the preset outdoor side maximum pressure Pdmax, the frequency F1 of the compressor 10 is gradually reduced to f1=f1-nx.
Of course, there is a difference in the value of Pdmax for different refrigerants, for example pdmax=4.3 MPa for refrigerant R32, and the maximum outdoor pressure needs to be set according to the corresponding refrigerant material.
In the first recovery period T1, x is the amount of each downward adjustment of the compressor 10 until the outdoor side pressure Pd is not greater than the preset outdoor side maximum pressure Pdmax, at this time, the compressor 10 continues to operate at the adjusted F1 frequency, so as to prevent the leakage and explosion of the pipeline caused by the excessive outdoor side refrigerant pressure.
In the case where the outdoor side pressure Pd is not greater than the outdoor side maximum pressure Pdmax, the compressor 10 frequency is continuously operated at f1=fmax until the low pressure detecting member 60 detects that the indoor side pressure Pl is less than the preset indoor side minimum pressure Plmin or the operation time exceeds the first recovery period T1.
The value of the indoor minimum pressure Plmin may be set to 0.15Mpa because the atmospheric pressure is 0.1Mpa, i.e., when Plmin is less than 0.15Mpa, at this time because the indoor refrigerant has been substantially recovered into the compressor 10 and the indoor low pressure is still higher than the atmospheric pressure.
At this time, if the refrigerant is basically recovered completely and the recovery is continued, air is mainly sucked, and at this time, the controller is shut down in time to stop the recovery in order to prevent the explosion caused by the backflow of more air into the compressor 10.
If the first recovery period T1 ends, the second recovery period is continued, and in the second recovery period, the frequency of the compressor 10 continues to decrease by the unit F, where F is the amount of change of the compressor 10in the different recovery periods, that is, f2=f1-F, and the opening of the electronic expansion valve 50 decreases by the unit E, where E is the amount of change of the electronic expansion valve 50 in the different recovery periods, that is, e2=e1-E.
At this time, the refrigerant recovery is continued, and at the same time, the value of the indoor minimum pressure Plmin is monitored in real time, and when Plmin is less than 0.15Mpa, it is indicated that the refrigerant is completely recovered, and the compressor 10 and the electronic expansion valve 50 are turned off in the second recovery period T2.
Otherwise, the operation is continued until the third recovery period is entered, in which the frequency of the compressor 10 continues to decrease in units F, i.e., f3=f1-2F, and the opening of the electronic expansion valve 50 decreases in units E, i.e., e3=e1-2E, on the basis of the second recovery period.
In this way, in the nth recovery period Tn, the controller controls the operation frequency fn=f1- (n-1) F of the compressor 10, and the controller controls the opening degree en=e1- (n-1) E of the electronic expansion valve 50 in the nth recovery period Tn.
When the low pressure detecting unit 60 detects that the indoor side pressure Pl is smaller than the preset indoor side minimum pressure Plmin, the controller controls the compressor 10 to be turned off, the opening of the electronic expansion valve 50 is set to 0, and finally, both the liquid side stop valve 91 and the air side stop valve 92 are closed, so that the refrigerant is prevented from being continuously delivered to the indoor side of the air conditioner.
In the refrigerant recovery process of the air conditioner, the compressor 10 and the electronic expansion valve 50 are closed in steps to prevent sudden closing to 0, resulting in instantaneous high pressure rise of the system, and damage or incomplete recovery of the system
The high pressure detecting member 70 is a high pressure sensor, which prevents the system from being operated at high frequency all the time and causing high pressure to be too high, exceeding the highest operating pressure of the system (generally 4.3MPa for R32 system), and causing leakage and explosion of the pipeline.
The low pressure detecting member 60 is a low pressure sensor, and the addition of a low pressure switch prevents air from entering the system (atmospheric pressure is 0.1 MPa), and the air conditioner explosion can be directly caused when flammable and explosive refrigerants such as R32, R290 and the like are mixed into the air. .
A check valve 80 is formed between the four-way valve 20 and the refrigerant inlet of the compressor 10, and the function of preventing the refrigerant from flowing into the indoor unit at the suction side can be realized without an additional electromagnetic valve or electromagnetic stop valve, so that the refrigerant is prevented from flowing back into the indoor unit from the refrigerant inlet end of the compressor 10.
The air conditioner can recover the refrigerant leaked from the indoor side through control and adjustment of the air conditioner when the refrigerant leaks, so that the use risk of the refrigerant is reduced, the safety performance is improved, and the air conditioner is high in practicability.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative embodiments of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be covered by the present invention, and the scope of the present invention shall be defined by the appended claims.
Claims (8)
1. An air conditioner, comprising:
The air outlet of the indoor unit is provided with a refrigerant detection piece;
a compressor on which a refrigerant outlet and a refrigerant inlet are formed;
the four-way valve is provided with a high-pressure detection part between the four-way valve and a refrigerant outlet of the compressor, and a low-pressure detection part is formed between the four-way valve and a refrigerant inlet of the compressor;
the indoor heat exchanger is positioned in the indoor unit and is communicated with the compressor through a four-way valve;
the outdoor heat exchanger is communicated with the compressor through a four-way valve, and an electronic expansion valve is arranged between the outdoor heat exchanger and the indoor heat exchanger;
a controller configured to:
The four-way valve is controlled to work as an evaporator in response to the leakage signal detected by the refrigerant detection piece, the compressor is controlled to work at a preset frequency in a preset recovery period, the pressure signals of the high-pressure detection piece and the low-pressure detection piece are received, and the opening of the electronic expansion valve in the preset recovery period is controlled;
when the refrigerant detection piece detects that the indoor side refrigerant concentration is larger than the preset concentration, the controller controls the frequency of the compressor in a first recovery period T1 to be F1, F1=fmax, fmax is the highest running frequency of the compressor, and controls the opening of the electronic expansion valve in the first recovery period T1 to be E1;
In the first recovery period T1, the high pressure detecting element detects the outdoor side pressure Pd in real time, and when the outdoor side pressure Pd is greater than a preset outdoor side maximum pressure Pdmax, the frequency F1 of the compressor is gradually reduced to f1=f1-nx until the outdoor side pressure Pd is not greater than the preset outdoor side maximum pressure Pdmax, x is the amount of each frequency down-regulation of the compressor in the first recovery period T1, and at this time, the compressor continues to continuously operate at the adjusted F1 frequency;
Under the condition that the outdoor side pressure Pd is not more than the outdoor side maximum pressure Pdmax, the compressor frequency is continuously operated at F1=fmax until the low pressure detection piece detects that the indoor side pressure Pl is less than the preset indoor side minimum pressure Plmin or the operation time exceeds the first recovery period T1;
In an nth recovery period Tn, the controller controls the running frequency Fn=F1- (n-1) F of the compressor, wherein F is the variation of the compressor in different recovery periods;
the controller controls the opening En=E1- (n-1) E of the electronic expansion valve in the nth recovery period Tn, wherein E is the variation of the electronic expansion valve in different recovery periods;
when the low pressure detecting member detects that the indoor side pressure Pl is smaller than a preset indoor side minimum pressure Plmin, the controller controls the compressor to be turned off, and the opening of the electronic expansion valve is set to 0.
2. An air conditioner according to claim 1, wherein,
The four-way valve comprises an input port, a backflow port, a first port and a second port, wherein the input port is communicated with a refrigerant outlet of the compressor, the backflow port is communicated with a refrigerant inlet of the compressor, the first port is communicated with the indoor heat exchanger, and the second port is communicated with the outdoor heat exchanger.
3. An air conditioner according to claim 2, wherein,
The refrigerant detection part is used for detecting the concentration of the refrigerant at the indoor side, when the concentration of the refrigerant is larger than the preset concentration, the controller is used for communicating the first port of the four-way valve with the backflow port, the second port is communicated with the input port, the outdoor heat exchanger is used as a condenser, the indoor heat exchanger is used as an evaporator, and otherwise, the air conditioner continues to operate according to a user setting mode.
4. An air conditioner according to claim 1, wherein,
The running time of the air conditioner in the refrigerant recovery stage comprises a plurality of recovery periods, and the number of the recovery periods and the duration of each recovery period are determined according to the actual demands of users.
5. An air conditioner according to claim 1, wherein,
In the refrigerant recovery process, the opening E1 of the electronic expansion valve is smaller than the opening E0 of the electronic expansion valve in the normal working process of the air conditioner, the high-pressure detection part is a high-pressure sensor, and the low-pressure detection part is a low-pressure sensor.
6. An air conditioner according to claim 1, wherein,
And a one-way valve is formed between the four-way valve and the refrigerant inlet of the compressor and is used for preventing the refrigerant from flowing back into the indoor unit from the refrigerant inlet end of the compressor.
7. An air conditioner according to claim 1, wherein,
And a liquid side stop valve is arranged between the electronic expansion valve and the indoor heat exchanger.
8. An air conditioner according to claim 1, wherein,
And a gas side stop valve is arranged between the indoor heat exchanger and the compressor.
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| CN202210923121.8A CN115289651B (en) | 2022-08-02 | 2022-08-02 | Air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106595149A (en) * | 2016-11-22 | 2017-04-26 | 珠海格力电器股份有限公司 | Refrigerant recovery method and device of air conditioner |
| CN110030757A (en) * | 2019-03-26 | 2019-07-19 | 青岛海尔空调电子有限公司 | Multi-gang air-conditioner and its control method |
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| JP3208923B2 (en) * | 1993-05-28 | 2001-09-17 | ダイキン工業株式会社 | Operation control device for air conditioner |
| JP4711706B2 (en) * | 2005-03-18 | 2011-06-29 | 三菱電機株式会社 | Air conditioner |
| JP5414482B2 (en) * | 2009-12-01 | 2014-02-12 | 日立アプライアンス株式会社 | Air conditioner |
| CN111121156B (en) * | 2020-01-20 | 2021-06-04 | 青岛海信日立空调系统有限公司 | Multi-connected air conditioner |
| CN113739338B (en) * | 2021-09-14 | 2022-10-11 | 宁波奥克斯电气股份有限公司 | Liquid collection control method and system of air conditioner and air conditioner |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106595149A (en) * | 2016-11-22 | 2017-04-26 | 珠海格力电器股份有限公司 | Refrigerant recovery method and device of air conditioner |
| CN110030757A (en) * | 2019-03-26 | 2019-07-19 | 青岛海尔空调电子有限公司 | Multi-gang air-conditioner and its control method |
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