CN110864397A - Fixed-frequency air conditioner and protection method thereof - Google Patents
Fixed-frequency air conditioner and protection method thereof Download PDFInfo
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- CN110864397A CN110864397A CN201911217300.4A CN201911217300A CN110864397A CN 110864397 A CN110864397 A CN 110864397A CN 201911217300 A CN201911217300 A CN 201911217300A CN 110864397 A CN110864397 A CN 110864397A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000003507 refrigerant Substances 0.000 claims abstract description 46
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005057 refrigeration Methods 0.000 abstract description 4
- 230000001012 protector Effects 0.000 description 10
- 238000013507 mapping Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F11/70—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/37—Capillary tubes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- 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
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/07—Details of compressors or related parts
- F25B2400/077—Compressor control units, e.g. terminal boxes, mounted on the compressor casing wall containing for example starter, protection switches or connector contacts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2115—Temperatures of a compressor or the drive means therefor
- F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side of the compressor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a fixed-frequency air conditioner and a protection method of the fixed-frequency air conditioner, wherein the fixed-frequency air conditioner comprises a compressor, an indoor side heat exchanger, an outdoor side heat exchanger, a main throttling branch connecting the outdoor side heat exchanger and the indoor side heat exchanger, and at least one auxiliary throttling branch arranged in parallel with the main throttling branch, when detecting that the exhaust temperature of the compressor rises to a first preset temperature protection threshold, a controller controls the corresponding auxiliary throttling branch to participate in throttling and increases the flow of circulating refrigerant, thereby reducing the exhaust temperature, avoiding the shutdown or damage of the compressor caused by triggering the protection of the compressor, simultaneously controlling the auxiliary throttling branch participating in throttling to be correspondingly closed when the exhaust temperature drops to a second preset temperature protection threshold, only the main throttling branch and/or the residual auxiliary throttling not closed to participate in throttling and reducing the flow of the circulating refrigerant, thereby improving the exhaust temperature and ensuring the refrigeration effect.
Description
Technical Field
The invention relates to the technical field of fixed-frequency air conditioners, in particular to a fixed-frequency air conditioner and a protection method of the fixed-frequency air conditioner.
Background
The constant-frequency air conditioner has a wide market due to low price at present, wherein the constant-frequency air conditioner performs circuit breaking protection on a compressor under the condition that the current and the exhaust temperature are both overhigh through an overload protector arranged on the compressor.
And according to the characteristics of the overload protector of the compressor, the condition of triggering protection is composed of exhaust temperature and current, the lower the running current is, the higher the protection temperature is, and the scheme has two disadvantages:
1. under the conditions of high voltage and less refrigerant, the current is small, the exhaust temperature of the trigger protection is very high, and the service life of the compressor is reduced and even the compressor is burnt;
2. under the outdoor high temperature condition, the current and the exhaust temperature are high, the protection is easy to trigger, and the air conditioner is stopped for protection when the refrigeration effect is most needed, so that the use is influenced, and therefore, the protection mechanism of the existing air conditioner has the protection defect.
Disclosure of Invention
The invention mainly aims to provide a fixed-frequency air conditioner, aiming at solving the problem of compressor damage or shutdown caused by the problem of a protection mechanism of the fixed-frequency air conditioner.
In order to achieve the purpose, the fixed-frequency air conditioner provided by the invention comprises a compressor, an indoor side heat exchanger, an outdoor side heat exchanger, a main throttling branch for connecting the outdoor side heat exchanger and the indoor side heat exchanger, and at least one auxiliary throttling branch which is connected with the main throttling branch in parallel;
the fixed-frequency air conditioner also comprises a controller and a temperature sensor for detecting the exhaust temperature of the compressor;
the controller is used for controlling corresponding auxiliary throttling branch circuits in at least one path of auxiliary throttling branch circuits to participate in throttling when the exhaust temperature of the compressor reaches a first preset temperature protection threshold value; and
and when the exhaust temperature of the compressor is reduced to a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
In one embodiment, the auxiliary throttle leg comprises a plurality of ways.
In an embodiment, the controller is specifically configured to: when the exhaust temperature of the compressor reaches one of preset temperature values in a first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to participate in throttling; and
and when the exhaust temperature of the compressor is reduced to one of preset temperature values in a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to exit throttling.
In one embodiment, the refrigerant flow opening degree of each auxiliary throttling branch is multiplied in proportion.
In one embodiment, the controller is further configured to:
and when the exhaust temperature of the compressor is greater than a preset temperature peak value after the auxiliary throttling branch circuits participate in throttling, controlling the compressor to stop.
In an embodiment, the main throttle branch is a throttle valve core, each auxiliary throttle branch comprises a solenoid valve and a capillary tube connected in series, and a controlled end of the solenoid valve is connected with a control end of the controller.
The invention also provides a protection method of the fixed-frequency air conditioner, the fixed-frequency air conditioner comprises a compressor, an indoor side heat exchanger, an outdoor side heat exchanger, a main throttling branch for connecting the outdoor side heat exchanger and the indoor side heat exchanger, and at least one auxiliary throttling branch which is connected with the main throttling branch in parallel, the protection method of the fixed-frequency air conditioner comprises the following steps:
detecting the exhaust temperature of a compressor when the air conditioner operates in a refrigerating mode;
when the exhaust temperature of the compressor reaches a first preset temperature protection threshold value, controlling a corresponding auxiliary throttling branch in at least one auxiliary throttling branch to participate in throttling; and
and when the exhaust temperature of the compressor is reduced to a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
In an embodiment, the auxiliary throttling branch includes multiple paths, and the method for protecting the fixed-frequency air conditioner specifically includes:
detecting the exhaust temperature of a compressor when the air conditioner operates in a refrigerating mode;
when the exhaust temperature of the compressor reaches one of preset temperature values in a first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to participate in throttling;
and when the exhaust temperature of the compressor is reduced to one of preset temperature values in a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to exit throttling.
In one embodiment, when each of the auxiliary throttle branches is controlled to be conducted, the refrigerant flow passing through each of the auxiliary throttle branches is proportionally multiplied.
In one embodiment, the method for protecting a fixed-frequency air conditioner further includes:
and when the exhaust temperature of the compressor is greater than a preset temperature peak value after the auxiliary throttling branch circuits participate in throttling, controlling the compressor to stop.
According to the technical scheme, at least one auxiliary throttling branch is arranged in parallel on a main throttling branch, when the controller detects that the exhaust temperature of the compressor rises to a first preset temperature protection threshold value, the corresponding auxiliary throttling branch is controlled to participate in throttling, the flow of circulating refrigerant is increased, the exhaust temperature is reduced, the phenomenon that the compressor is shut down or damaged due to triggering of compressor protection is avoided, meanwhile, when the exhaust temperature drops to a second preset temperature protection threshold value, the auxiliary throttling branch participating in throttling is controlled to be correspondingly closed, only the main throttling branch and/or the residual auxiliary throttling which is not closed participate in throttling, the flow of the circulating refrigerant is reduced, the exhaust temperature is improved, and the refrigeration effect is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a fixed-frequency air conditioner according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a fixed-frequency air conditioner according to another embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a method for protecting a fixed-frequency air conditioner according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a method for protecting a fixed-frequency air conditioner according to another embodiment of the present invention;
fig. 5 is a schematic flow chart illustrating a protection method for a fixed-frequency air conditioner according to another embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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.
It should be noted that the descriptions relating to "first", "second", etc. in the present invention are 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 defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout is: the method comprises three parallel schemes, wherein the scheme is taken as an A/B (A/B) as an example, the scheme comprises the scheme A, the scheme B or the scheme A and the scheme B simultaneously satisfy, in addition, the technical schemes between the various embodiments can be combined with each other, but the technical schemes must be based on the realization of the technical schemes by a person skilled in the art, and when the technical schemes are mutually contradictory or can not be realized, the combination of the technical schemes is not considered to exist, and the protection scope of the invention is not within the protection scope of the invention.
The invention provides a fixed-frequency air conditioner.
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a fixed-frequency air conditioner of the present invention, which includes a compressor 10, an indoor side heat exchanger 30, an outdoor side heat exchanger 20, a main throttling branch 40 connecting the outdoor side heat exchanger 20 and the indoor side heat exchanger 30, and at least one auxiliary throttling branch arranged in parallel with the main throttling branch 40, for example, only a first auxiliary throttling branch 51 is arranged in parallel, or a plurality of auxiliary throttling branches are connected in parallel at the same time;
the fixed frequency air conditioner further includes a controller (not shown) and a temperature sensor 60 for detecting a discharge temperature of the compressor 10;
the controller is configured to control a corresponding auxiliary throttling branch of the at least one auxiliary throttling branch to participate in throttling when the exhaust temperature of the compressor 10 reaches a first preset temperature protection threshold; and
and when the exhaust temperature of the compressor 10 is reduced from the first preset temperature protection threshold value to a second preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
In this embodiment, the compressor 10 is connected to the outdoor heat exchanger 20 through the exhaust pipe 70, the temperature sensor 60 is attached to the exhaust pipe 70 installed at the exhaust port of the compressor 10 to monitor the exhaust temperature of the compressor 10 in real time, and send the detected temperature signal to the controller, the auxiliary throttle branch is connected in parallel with the main throttle branch 40 and then connected in series between the outdoor heat exchanger 20 and the indoor heat exchanger 30, the main throttle branch 40 is kept in a conducting state when the air conditioner is in normal operation, so as to achieve the throttling effect, at least one auxiliary throttle branch is provided, or a plurality of auxiliary throttle branches can be provided.
During normal operation, the discharge temperature of the compressor 10 is kept within a certain temperature range, when the compressor 10 is overloaded and the discharge temperature is too high due to too high outdoor temperature, the overload protector of the compressor 10 itself protects the compressor 10, controls the compressor 10 to stop operating, or in a state of high voltage and little refrigerant, the current is small, at this time, the discharge temperature triggering the overload protector is high, which easily causes the life of the compressor 10 to be reduced or even burnt out, therefore, in this embodiment, when the discharge temperature of the compressor 10 is too high and reaches a first preset temperature protection threshold, for example, 110 to 130 degrees, the controller controls the corresponding auxiliary throttling branch to communicate and participate in throttling, the refrigerant flow is increased, the discharge temperature of the compressor 10 is reduced, and meanwhile, in order to avoid the compressor 10 from being stopped or damaged due to low temperature, under the condition that the pressure auxiliary throttling branch participates in throttling, when the exhaust temperature of the compressor 10 is reduced to a second preset temperature threshold value, for example, 60 to 70 degrees, the controller controls the auxiliary throttling branch which participates in throttling before to be correspondingly switched on or switched off so as to reduce the flow of the refrigerant, and further improve the exhaust temperature of the compressor 10, so that the exhaust temperature of the compressor 10 works in a certain temperature range, and the problem that an overload protector of the compressor 10 is triggered by mistake or the triggering temperature is too high is avoided.
In this embodiment, the controller may be separately configured, or directly configured as an overload protector of the compressor 10, the overload protector is connected to the temperature sensor 60 and the electromagnetic valve in the auxiliary throttling branch, a specific setting manner of the controller may be selected according to a requirement, and no specific limitation is made herein, the types of the main throttling branch 40 and the auxiliary throttling branch may be selected according to a requirement, and are a throttle valve or a capillary tube, in an embodiment, the main throttling branch 40 is a throttling valve core, each of the auxiliary throttling branches includes an electromagnetic valve and a capillary tube connected in series, and a controlled end of the electromagnetic valve is connected to a control end of the controller.
Meanwhile, the fixed-frequency air conditioner is further provided with a four-way valve, and the four-way valve is respectively connected with the outdoor heat exchanger 20, the indoor heat exchanger 30 and the compressor 10 so as to form a loop in which a refrigerant flows, so that the fixed-frequency air conditioner can be cooled and heated by the flowing of the refrigerant.
According to the technical scheme, at least one auxiliary throttling branch is arranged in parallel on the main throttling branch 40, when the controller detects that the exhaust temperature of the compressor 10 rises to a first preset temperature protection threshold value, the corresponding auxiliary throttling branch is controlled to participate in throttling, the flow of circulating refrigerant is increased, the exhaust temperature is reduced, the phenomenon that the compressor 10 is stopped or damaged due to triggering of protection of the compressor 10 is avoided, meanwhile, when the exhaust temperature drops to a second preset temperature protection threshold value, the auxiliary throttling branch participating in throttling is controlled to be correspondingly closed, only the main throttling branch 40 and/or the residual auxiliary throttling which is not closed participate in throttling, the flow of the circulating refrigerant is reduced, the exhaust temperature is improved, and the refrigeration effect is guaranteed.
In an embodiment, in order to avoid an excessive variation in the discharge temperature of the compressor 10, the auxiliary throttling branch includes multiple paths, and the controller may control the multiple auxiliary throttling branches to be turned on and off according to different temperature values, in an embodiment, the controller is specifically configured to: when the exhaust temperature of the compressor 10 reaches one of preset temperature values in a first preset temperature protection threshold value, controlling correspondingly combined auxiliary throttling branches in the multiple auxiliary throttling branches to participate in throttling; and
when the exhaust temperature of the compressor 10 is decreased from the first preset temperature protection threshold to one of the second preset temperature protection thresholds, the controller controls the auxiliary throttling branch in the multiple auxiliary throttling branches corresponding to the combination to exit throttling, that is, when the exhaust temperature of the compressor 10 is too high, the controller may control the auxiliary throttling branch in any combination to participate in throttling, or when the exhaust temperature of the compressor 10 is too low, the controller may control the auxiliary throttling branch in any combination to exit throttling, taking three auxiliary throttling branches as an example, as shown in fig. 2, when the exhaust temperature of the compressor 10 is higher than the first preset temperature, the controller may control the auxiliary throttling branch 51 in the first branch to conduct throttling, and when the exhaust temperature is higher than the second preset temperature, the controller may control the auxiliary throttling branch 52 in the second branch to participate in throttling, further increasing the refrigerant flow rate, when the exhaust temperature is higher than the third preset temperature, the controller may control the third auxiliary throttling branch 53 to participate in throttling, so as to further increase the refrigerant flow, and reduce the exhaust temperature of the compressor 10, where the first preset temperature is lower than the second preset temperature, and the second preset temperature is lower than the third preset temperature.
Meanwhile, when the exhaust temperature of the compressor 10 is reduced to a fourth preset temperature due to the increase of the refrigerant, the controller controls the first auxiliary throttling branch 51 to be shut off and to exit throttling, so that the flow rate of the refrigerant is reduced, when the exhaust temperature is reduced to the fourth preset temperature, the controller controls the second auxiliary throttling branch 52 to be shut off and to exit throttling, so that the flow rate of the refrigerant is further reduced, so that the exhaust temperature of the compressor 10 is increased, and if the exhaust temperature is still low, the controller can further control the other auxiliary throttling branch to exit throttling until the exhaust temperature of the compressor 10 reaches a normal value.
The above-mentioned example controller controls one of the auxiliary throttle branches to participate in throttling each time, and it can be understood that a mapping relation table may be further set according to a mapping relation between the exhaust temperature of the compressor 10 and the operation state of the auxiliary throttle branches, the auxiliary throttle branches corresponding to the labels and the corresponding number of the auxiliary throttle branches are selected and opened according to the exhaust temperature of the compressor 10 and the mapping relation table, and the refrigerant flow opening degrees of the auxiliary throttle branches may be the same or different, and further the refrigerant flow rates flowing through the auxiliary throttle branches may be equal or different each time the refrigerant flow rate is turned on, in an embodiment, the refrigerant flow opening degree of each of the auxiliary throttle branches is multiplied in proportion.
For example, assuming that the auxiliary throttling branch is provided with three paths, the refrigerant flow opening degree of the main throttling branch 40 is 8, the opening degree of the first auxiliary throttling branch 51 is 1, the opening degree of the second auxiliary throttling branch 52 is 2, and the opening degree of the third auxiliary throttling branch 53 is 4, further when the discharge temperature of the compressor 10 is greater than a first preset temperature, the controller controls the first auxiliary throttling branch 51 to be opened to participate in throttling, at which the sum of the refrigerant flow opening degrees is 9, when the discharge temperature of the compressor 10 is greater than the first preset temperature and less than a second preset temperature, the controller controls the second auxiliary throttling branch to participate in throttling, at which the sum of the refrigerant flow opening degrees is 10, when the discharge temperature of the compressor 10 is greater than the second preset temperature and less than the third preset temperature, the controller controls the first and second auxiliary throttling branches to participate in throttling, at which the sum of the refrigerant flow opening degrees is 11, by analogy, the opening degree of the auxiliary throttling branch participating in throttling can be sequentially set to be 1, 2, 3, 4, 5, 6 and 7, namely the opening degree of the total throttling branch can be increased from 8 to 15, otherwise, when the exhaust temperature of the compressor 10 is too low, the auxiliary throttling branch exits throttling and can also be sequentially set to be 1, 2, 3, 4, 5, 6 and 7, so that the main throttling working state is recovered, and the opening degree of the total throttling branch can be reduced from 15 to 8, so that the temperature adaptability of the compressor 10 is improved, and the frequent temperature change of the compressor 10 is avoided.
In an embodiment, to improve safety, the controller is further configured to:
in this embodiment, after the auxiliary throttling branch circuits participate in throttling, the exhaust temperature of the compressor 10 is still high after the controller controls all the auxiliary throttling branch circuits to participate in throttling, and when the exhaust temperature exceeds the preset temperature peak value, it indicates that the refrigerant in the current fixed-frequency air conditioner is too little, and at this time, the compressor 10 continues to work, which may cause the life of the compressor 10 to be reduced or even burned out, so that the compressor 10 needs to be controlled to stop, and corresponding overhaul is performed.
The present invention further provides a protection method for a fixed frequency air conditioner, as shown in fig. 1 and fig. 2, the fixed frequency air conditioner includes a compressor 10, an indoor side heat exchanger 30, an outdoor side heat exchanger 20, a main throttling branch 40 connecting the outdoor side heat exchanger 20 and the indoor side heat exchanger 30, and at least one auxiliary throttling branch arranged in parallel with the main throttling branch 40, as shown in fig. 3, the protection method for the fixed frequency air conditioner includes:
s10, detecting the exhaust temperature of the compressor 10 when the air conditioner operates in a refrigerating mode;
s20, when the exhaust temperature of the compressor 10 reaches a first preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in at least one auxiliary throttling branch to participate in throttling; and
and S30, when the exhaust temperature of the compressor 10 is reduced from the first preset temperature protection threshold value to a second preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
In this embodiment, the compressor 10 is connected to the outdoor heat exchanger 20 through the exhaust pipe 70, the temperature sensor 60 is attached to the exhaust pipe 70 installed at the exhaust port of the compressor 10 to monitor the exhaust temperature of the compressor 10 in real time, and send the detected temperature signal to the controller, the auxiliary throttle branch is connected in parallel with the main throttle branch 40 and then connected in series between the outdoor heat exchanger 20 and the indoor heat exchanger 30, the main throttle branch 40 is kept in a conducting state when the air conditioner is in normal operation, so as to achieve the throttling effect, at least one auxiliary throttle branch is provided, or a plurality of auxiliary throttle branches can be provided.
During normal operation, the discharge temperature of the compressor 10 is kept within a certain temperature range, when the compressor 10 is overloaded and the discharge temperature is too high due to too high outdoor temperature, the overload protector of the compressor 10 protects the compressor 10, and controls the compressor 10 to stop operating, or in a state of high voltage and little refrigerant, the current is small, and at this time, the discharge temperature triggering the overload protector is high, which easily causes the life of the compressor 10 to be reduced or even burnt out, therefore, in this embodiment, during the cooling operation of the air conditioner, the discharge temperature of the compressor 10 is detected by the temperature sensor 60, and when the discharge temperature of the compressor 10 is too high and reaches a first preset temperature protection threshold, for example, 110 to 130 degrees, the corresponding auxiliary throttling branch is controlled to be communicated to participate in throttling, the flow of the refrigerant is increased, the discharge temperature of the compressor 10 is reduced, and at the same time, in order to avoid the compressor 10, under the condition that the pressure auxiliary throttling branch participates in throttling, when the exhaust temperature of the compressor 10 is reduced to a second preset temperature threshold value, for example, 60-70 degrees, the auxiliary throttling branch which participates in throttling before is controlled to be correspondingly turned on or turned off so as to reduce the flow of refrigerant, further improve the exhaust temperature of the compressor 10, enable the exhaust temperature of the compressor 10 to work within a certain temperature range, and further avoid the problem that an overload protector of the compressor 10 is triggered mistakenly or the triggering temperature is too high.
In an embodiment, as shown in fig. 2 and 3, the auxiliary throttling branch includes multiple paths, and the method for protecting the fixed-frequency air conditioner specifically includes:
s10, detecting the exhaust temperature of the compressor 10 when the air conditioner operates in a refrigerating mode;
s21, when the exhaust temperature of the compressor 10 reaches one of preset temperature values in a first preset temperature protection threshold value, controlling an auxiliary throttling branch of a corresponding combination in a plurality of auxiliary throttling branches to participate in throttling; and
s31, when the discharge temperature of the compressor 10 drops from the first preset temperature protection threshold to one of the second preset temperature protection thresholds, controlling the auxiliary throttle branches of the multiple auxiliary throttle branches corresponding to the combination to exit throttling, that is, when the discharge temperature of the compressor 10 is too high, controlling the auxiliary throttle branches of any combination to participate in throttling, or when the discharge temperature of the compressor 10 is too low, controlling the auxiliary throttle branches of any combination to exit throttling, taking three auxiliary throttle branches as an example, as shown in fig. 2, when the discharge temperature of the compressor 10 is higher than the first preset temperature, the first auxiliary throttle branch 51 may be controlled to conduct and participate in throttling, when the discharge temperature is higher than the second preset temperature, the second auxiliary throttle branch 52 may be controlled to participate in throttling, so as to further increase the refrigerant flow rate, and when the discharge temperature is higher than the third preset temperature, the third auxiliary throttle branch 53 may be controlled to participate in throttling, so as to further increase the refrigerant flow, and reduce the exhaust temperature of the compressor 10, where the first preset temperature is lower than the second preset temperature, and the second preset temperature is lower than the third preset temperature.
Meanwhile, when the exhaust temperature of the compressor 10 is reduced to a fourth preset temperature due to the increase of the refrigerant, the first auxiliary throttling branch 51 is controlled to be shut off and to be withdrawn from throttling, so that the flow rate of the refrigerant is reduced, when the exhaust temperature is reduced to the fourth preset temperature, the second auxiliary throttling branch 52 is controlled to be shut off and to be withdrawn from throttling, so that the flow rate of the refrigerant is further reduced, so that the exhaust temperature of the compressor 10 is increased, and if the exhaust temperature is still low, the other auxiliary throttling branch can be further controlled to be withdrawn from throttling until the exhaust temperature of the compressor 10 reaches a normal value.
In the above example, one of the auxiliary throttling branches is controlled to participate in throttling each time, it can be understood that a mapping relation table may be further set according to a mapping relation between the discharge temperature of the compressor 10 and the operation state of the auxiliary throttling branches, the auxiliary throttling branches with corresponding labels and the corresponding number of auxiliary throttling branches are selected and opened correspondingly according to the discharge temperature of the compressor 10 and the mapping relation table, and the refrigerant flow opening degrees of the auxiliary throttling branches may be the same or different, and further the refrigerant flow rates flowing through the auxiliary throttling branches may be equal or different each time the refrigerant flow rate is turned on, in an embodiment, the refrigerant flow opening degree of each of the auxiliary throttling branches is multiplied in proportion.
For example, assuming that the auxiliary throttling branch is provided with three paths, the refrigerant flow opening degree of the main throttling branch 40 is 8, the opening degree of the first auxiliary throttling branch 51 is 1, the opening degree of the second auxiliary throttling branch 52 is 2, and the opening degree of the third auxiliary throttling branch 53 is 4, further when the discharge temperature of the compressor 10 is greater than a first preset temperature, the first auxiliary throttling branch 51 is controlled to be opened to participate in throttling, the sum of the refrigerant flow opening degrees is 9, when the discharge temperature of the compressor 10 is greater than the first preset temperature and less than a second preset temperature, the second auxiliary throttling branch is controlled to participate in throttling, when the discharge temperature of the compressor 10 is greater than the second preset temperature and less than the third preset temperature, the sum of the refrigerant flow opening degrees is 10, when the discharge temperature of the compressor 10 is greater than the second preset temperature and less than the third preset temperature, the first and second auxiliary throttling branches are, by analogy, the opening degree of the auxiliary throttling branch participating in throttling can be sequentially set to be 1, 2, 3, 4, 5, 6 and 7, namely the opening degree of the total throttling branch can be increased from 8 to 15, otherwise, when the exhaust temperature of the compressor 10 is too low, the auxiliary throttling branch exits throttling and can also be sequentially set to be 1, 2, 3, 4, 5, 6 and 7, so that the main throttling working state is recovered, and the opening degree of the total throttling branch can be reduced from 15 to 8, so that the temperature adaptability of the compressor 10 is improved, and the frequent temperature change of the compressor 10 is avoided.
In an embodiment, as shown in fig. 5, the method for protecting a fixed-frequency air conditioner further includes:
and S40, controlling the compressor 10 to stop when the exhaust temperature of the compressor 10 is greater than a preset temperature peak value after the auxiliary throttling branch circuits participate in throttling.
In this embodiment, after the multi-path auxiliary throttling branch is controlled to participate in throttling completely, the exhaust temperature of the compressor 10 is still high and exceeds a preset temperature peak value, which indicates that the refrigerant in the current fixed-frequency air conditioner is too little, and at this time, the compressor 10 continues to work, which may cause the life of the compressor 10 to be reduced or even burned out, so that the compressor 10 needs to be controlled to stop and corresponding overhaul, thereby improving the safety of the compressor 10 and the fixed-frequency air conditioner.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fixed-frequency air conditioner is characterized by comprising a compressor, an indoor side heat exchanger, an outdoor side heat exchanger, a main throttling branch for connecting the outdoor side heat exchanger and the indoor side heat exchanger, and at least one auxiliary throttling branch which is connected with the main throttling branch in parallel;
the fixed-frequency air conditioner also comprises a controller and a temperature sensor for detecting the exhaust temperature of the compressor;
the controller is used for controlling corresponding auxiliary throttling branch circuits in at least one path of auxiliary throttling branch circuits to participate in throttling when the exhaust temperature of the compressor reaches a first preset temperature protection threshold value; and
and when the exhaust temperature of the compressor is reduced to a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
2. The fixed frequency air conditioner as claimed in claim 1, wherein said auxiliary throttle branch comprises a plurality of paths.
3. The fixed-frequency air conditioner of claim 2, wherein the controller is specifically configured to:
when the exhaust temperature of the compressor reaches one of preset temperature values in a first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to participate in throttling; and
and when the exhaust temperature of the compressor is reduced to one of preset temperature values in a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to exit throttling.
4. The fixed frequency air conditioner as claimed in claim 3, wherein the refrigerant flow rate opening degree of each of said auxiliary throttle branches is proportionally multiplied.
5. The fixed frequency air conditioner as claimed in claim 3, wherein said controller is further configured to:
and when the exhaust temperature of the compressor is greater than a preset temperature peak value after the auxiliary throttling branch circuits participate in throttling, controlling the compressor to stop.
6. The fixed-frequency air conditioner as claimed in claim 2, wherein said main throttle branch is a throttle valve core, each of said auxiliary throttle branches comprises a solenoid valve and a capillary tube connected in series, and a controlled end of said solenoid valve is connected to a control end of said controller.
7. A protection method of a fixed frequency air conditioner is characterized in that the fixed frequency air conditioner comprises a compressor, an indoor side heat exchanger, an outdoor side heat exchanger, a main throttling branch for connecting the outdoor side heat exchanger and the indoor side heat exchanger, and at least one auxiliary throttling branch which is connected with the main throttling branch in parallel, and the protection method of the fixed frequency air conditioner comprises the following steps:
detecting the exhaust temperature of a compressor when the air conditioner operates in a refrigerating mode;
when the exhaust temperature of the compressor reaches a first preset temperature protection threshold value, controlling a corresponding auxiliary throttling branch in at least one auxiliary throttling branch to participate in throttling;
and when the exhaust temperature of the compressor is reduced to a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling the corresponding auxiliary throttling branch in the at least one auxiliary throttling branch to exit throttling.
8. The method for protecting a fixed-frequency air conditioner according to claim 7, wherein the auxiliary throttling branch comprises multiple paths, and the method for protecting a fixed-frequency air conditioner specifically comprises the following steps:
detecting the exhaust temperature of a compressor when the air conditioner operates in a refrigerating mode;
when the exhaust temperature of the compressor reaches one of preset temperature values in a first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to participate in throttling; and
and when the exhaust temperature of the compressor is reduced to one of preset temperature values in a second preset temperature protection threshold value from the first preset temperature protection threshold value, controlling auxiliary throttling branches correspondingly combined in the multiple auxiliary throttling branches to exit throttling.
9. The method for protecting a fixed frequency air conditioner according to claim 8, wherein the flow rate of refrigerant flowing through each of said auxiliary throttle branches is proportionally multiplied when controlling the conduction of each of said auxiliary throttle branches.
10. The method for protecting a fixed-frequency air conditioner according to claim 8, wherein the method for protecting a fixed-frequency air conditioner further comprises:
and when the exhaust temperature of the compressor is greater than a preset temperature peak value after the auxiliary throttling branch circuits participate in throttling, controlling the compressor to stop.
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| JPH07266859A (en) * | 1994-04-01 | 1995-10-17 | Matsushita Electric Ind Co Ltd | Heat pump cooling, heating and dehumidifying device for electric vehicle |
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