CN113324312B - Control method of air conditioning unit and air conditioning unit - Google Patents
Control method of air conditioning unit and air conditioning unit Download PDFInfo
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- CN113324312B CN113324312B CN202010130010.2A CN202010130010A CN113324312B CN 113324312 B CN113324312 B CN 113324312B CN 202010130010 A CN202010130010 A CN 202010130010A CN 113324312 B CN113324312 B CN 113324312B
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
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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
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
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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
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- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioning units and aims to solve the problem that if insufficient refrigerant enters a compressor in the existing air conditioning unit, electronic elements of the compressor can be burnt out, so that the air conditioning unit cannot normally operate. The invention provides a control method of an air conditioning unit, the air conditioning unit comprises an evaporator, a condenser, a compressor and a throttling element, the compressor is provided with a cooling port, the cooling port is provided with a first opening and closing valve, and a refrigerant pump and a second opening and closing valve which are connected in parallel are arranged between the condenser and the cooling port, the control method comprises the following steps: when the air conditioning unit is in an abnormal working condition, acquiring the temperature of the compressor and judging whether the air conditioning unit meets the starting condition of the refrigerant pump; if the temperature of the compressor is higher than a first preset temperature, opening the first opening-closing valve and closing the second opening-closing valve; and if the air conditioning unit meets the starting condition of the refrigerant pump, starting the refrigerant pump to operate. The invention can avoid the burning out of the electronic elements of the compressor due to overhigh temperature.
Description
Technical Field
The invention belongs to the technical field of air conditioning units, and particularly provides a control method of an air conditioning unit and the air conditioning unit.
Background
The air conditioning unit can realize the regulation of the indoor environment temperature, taking the magnetic suspension variable frequency centrifugal water chilling unit as an example, under the large background of energy conservation and environmental protection, the selection of the high-efficiency magnetic suspension variable frequency centrifugal water chilling unit is one of the important measures of energy conservation and environmental protection of the central air conditioning system, and more air conditioning host manufacturers are also added to the unit research and development and marketing of the magnetic suspension central air conditioner.
The magnetic suspension frequency conversion centrifugal water chilling unit mainly comprises four parts, namely a magnetic suspension centrifugal compressor, an evaporator, a condenser and a throttle valve, and is completed by connecting pipelines and adding auxiliary parts such as a filter, an electric control part and the like. The magnetic suspension frequency conversion type centrifugal compressor is the core of a refrigeration system, sufficient refrigerant is ensured to enter the compressor when the compressor operates to cool the compressor, if the frequency converter and the motor of the compressor are cooled only by the high pressure of a condenser, the compressor needs to increase the rotating speed when the temperature of inlet water of an evaporator is lower than the temperature of inlet water of the evaporator under special use working conditions (such as aluminum oxide cooling, outlet liquid at 18 ℃ is needed, when the temperature of inlet water of the condenser is lower than the temperature of inlet water of the evaporator), especially when the compressor is just started or the end load suddenly needs to be increased during partial load operation, the frequency converter and the motor generate a large amount of heat, although the pressure difference between the evaporator and a condenser cylinder is poor, the pressure difference under reverse working conditions (namely, the temperature of the inlet water of the condenser is lower than the temperature of the inlet water of the evaporator) is too small, when the unit continuously operates, enough refrigerant cannot be provided to fully cool the motor, the temperature of the frequency converter is insufficient, an alarm is generated, the unit cannot normally start or operate at a low rotating speed, namely, if the temperature cannot be timely reduced, electronic elements of the compressor are easily burned out, and the whole unit cannot normally operate even cannot operate normally, and the cold water is seriously affected.
Therefore, there is a need in the art for a new control method for an air conditioning unit and a corresponding air conditioning unit to solve the above problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, to solve the problem that the conventional air conditioning unit cannot normally operate because the electronic components of the compressor may be burned out if insufficient refrigerant enters the compressor, the present invention provides a control method for an air conditioning unit, the air conditioning unit includes an evaporator, a condenser, a compressor and a throttling element, the evaporator, the compressor, the condenser and the throttling element together form a refrigerant circulation loop, the compressor is provided with a cooling port, the cooling port is provided with a first on-off valve for controlling the opening and closing of the cooling port, and a refrigerant pump and a second on-off valve which are connected in parallel are arranged between the condenser and the cooling port, the control method includes: when the air conditioning unit is in an abnormal working condition, acquiring the temperature of the compressor and judging whether the air conditioning unit meets the starting condition of the refrigerant pump; if the temperature of the compressor is greater than a first preset temperature, opening the first opening-closing valve and closing the second opening-closing valve; and if the air conditioning unit meets the starting condition of the refrigerant pump, starting the refrigerant pump to operate.
In a preferred technical solution of the above control method, the refrigerant pump start condition includes: the water inlet temperature of the evaporator is greater than the water inlet temperature of the condenser, the duration time of the water inlet temperature of the condenser reaches first preset time, and the rotating speed of the compressor is greater than first preset rotating speed, and/or the water inlet temperature of the evaporator is less than or equal to the water inlet temperature of the condenser, the duration time of the water inlet temperature of the condenser reaches second preset time, the rotating speed of the compressor is greater than second preset rotating speed, the ratio of the cylinder pressure of the condenser to the cylinder pressure of the evaporator is less than first preset value, and/or the temperature of the compressor is greater than second preset temperature, the duration time of the compressor reaches third preset time, wherein the second preset temperature is greater than the first preset temperature.
In a preferred technical solution of the above control method, the first preset time is equal to the second preset time, and the first preset rotation speed is equal to the second preset rotation speed.
In a preferred embodiment of the above control method, the control method further includes: judging whether the air conditioning unit meets the stop condition of the refrigerant pump or not in the operation process of the refrigerant pump; and if the air conditioning unit meets the refrigerant pump stop condition, stopping the operation of the refrigerant pump.
In a preferred embodiment of the above control method, the refrigerant pump stop condition includes: the method comprises the following steps that a compressor stops running, and/or the water inlet temperature of an evaporator is smaller than or equal to the water inlet temperature of a condenser, the duration time reaches a fourth preset time, the ratio of the cylinder pressure of the condenser to the cylinder pressure of the evaporator is larger than a second preset value, the temperature of the compressor is smaller than or equal to a third preset temperature, the duration time reaches a fifth preset time, and the third preset temperature is larger than the first preset temperature.
In a preferred embodiment of the above control method, the control method further includes: after the first open-close valve is opened and the second open-close valve is closed, if the temperature of the compressor is less than or equal to a fourth preset temperature, the first open-close valve is closed and the second open-close valve is opened, wherein the fourth preset temperature is less than or equal to the first preset temperature.
In a preferred embodiment of the above control method, the temperature of the compressor is the temperature of an inverter of the compressor.
In another aspect, the present invention further provides a control method for an air conditioning unit, where the air conditioning unit includes an evaporator, a condenser, a compressor, and a throttling element, the evaporator, the compressor, the condenser, and the throttling element together form a refrigerant circulation loop, the compressor is provided with a cooling port, the cooling port is provided with a first on-off valve for controlling the opening and closing of the cooling port, and a refrigerant pump and a second on-off valve connected in parallel are provided between the condenser and the cooling port, and the control method further includes: when the air conditioning unit is in a normal working condition, acquiring the temperature of a compressor; if the temperature of the compressor is greater than a fifth preset temperature, opening both the first open-close valve and the second open-close valve; closing the first open-close valve and/or the second open-close valve if the temperature of the compressor is less than or equal to a sixth preset temperature after the first open-close valve and the second open-close valve are opened; and the sixth preset temperature is less than or equal to the fifth preset temperature, and the refrigerant pump is always in a closed state when the air conditioning unit is in a normal working condition.
In a preferred technical solution of the above control method, the temperature of the compressor is the temperature of an inverter of the compressor.
In another aspect, the present invention further provides an air conditioning unit, where the air conditioning unit includes an evaporator, a condenser, a compressor, and a throttling element, the evaporator, the compressor, the condenser, and the throttling element together form a refrigerant circulation loop, the compressor is provided with a cooling port, the cooling port is provided with a first on-off valve for controlling the opening and closing of the cooling port, and a refrigerant pump and a second on-off valve connected in parallel are provided between the condenser and the cooling port.
It can be understood by those skilled in the art that, in the preferred technical solution of the present invention, when the air conditioning unit is in an abnormal working condition, the compressor may be unable to be cooled effectively due to insufficient refrigerant, at this time, by obtaining the temperature of the compressor and judging whether the air conditioning unit meets the refrigerant pump starting condition, when the temperature of the compressor is greater than a first preset temperature, the first on-off valve at the cooling port of the compressor is opened, and when the air conditioning unit meets the refrigerant pump starting condition, the refrigerant flowing out of the condenser is injected into the cooling port of the compressor at a high pressure through the refrigerant pump, so as to sufficiently cool the compressor, prevent the electronic element of the compressor from being burned out due to an excessively high temperature, thereby not affecting the normal operation of the air conditioning unit, and improving the operation stability of the air conditioning unit, and enhancing the user experience.
Further, at the in-process of refrigerant pump operation, through judging whether air conditioning unit satisfies refrigerant pump stop condition to make the refrigerant pump stall when air conditioning unit satisfies refrigerant pump stop condition, through such setting, can avoid the refrigerant pump to continue to operate and consume too much electric energy on the one hand, on the other hand also avoids excessively lowering the temperature to the compressor.
Furthermore, after the compressor is cooled for a period of time, if the temperature of the compressor returns to normal, the first opening and closing valve is closed and the second opening and closing valve is opened, so that the compressor is stopped from being cooled continuously, excessive cooling is avoided, and at the moment, if the refrigerant pump is still running, the refrigerant flowing out of the condenser can be subjected to bypass circulation in a loop formed by the refrigerant pump and the second opening and closing valve, and the situation that the pressure of the refrigerant is continuously increased to damage a pipeline is avoided.
On the other hand, when air conditioning unit is in normal operating mode, can keep the refrigerant pump to close all the time this moment, open first on-off valve and second on-off valve, can realize the cooling to the compressor through unit self pressure, the refrigerant that the condenser flows can enter into the coolant department of compressor under sufficient pressure promptly to lower the temperature to the electronic component of compressor, from not influencing air conditioning unit's normal operating, and improve air conditioning unit's operating stability, promote user experience.
In another aspect, a first opening and closing valve is arranged at a cooling port of the compressor, and a refrigerant pump and a second opening and closing valve which are arranged in parallel are connected between the condenser and the cooling port of the compressor, so that when the air conditioning unit is in a normal working condition, refrigerant flowing out of the condenser can enter the cooling port of the compressor through the second opening and closing valve and the first opening and closing valve through the self pressure of the unit, and when the air conditioning unit is in an abnormal working condition, the refrigerant flowing out of the condenser enters the cooling port of the compressor through the refrigerant pump and the first opening and closing valve through the pressurization effect of the refrigerant pump, namely, electronic elements of the compressor can be fully cooled when the air conditioning unit is in the normal working condition or in the abnormal working condition, a structural basis is provided for stable operation of the air conditioning unit, the requirements of users are met, and the user experience is improved.
Drawings
FIG. 1 is a schematic diagram of the air conditioning assembly of the present invention;
fig. 2 is a flow chart of a control method of the air conditioning unit of the present invention.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that in the description of the present invention, the terms "in" or "out" and the like indicate directions or positional relationships based on those shown in the drawings, which are used for convenience of description only, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Based on the problem that the electronic elements of the compressor can be burnt out if no sufficient refrigerant enters the compressor in the existing air conditioning unit pointed out by the background technology, so that the air conditioning unit cannot normally operate, the invention provides a control method of the air conditioning unit and the air conditioning unit, aiming at fully cooling the compressor, avoiding the electronic elements of the compressor from being burnt out due to overhigh temperature, thus not influencing the normal operation of the air conditioning unit, improving the operation stability of the air conditioning unit and improving the user experience.
Specifically, as shown in fig. 1, the air conditioning unit of the present invention includes an evaporator 1, a condenser 2, a compressor 3, and a throttling element 4, where the evaporator 1, the compressor 3, the condenser 2, and the throttling element 4 together form a refrigerant circulation circuit, the compressor 3 is provided with a cooling port 31, the cooling port 31 is provided with a first on-off valve (not shown in the figure) for controlling the on-off of the cooling port 31, and a refrigerant pump 5 and a second on-off valve 6 are provided between the condenser 2 and the cooling port 31 in parallel. However, the first opening/closing valve may be a first electromagnetic valve, and the second opening/closing valve 6 may be a second electromagnetic valve, and of course, the first opening/closing valve and the second opening/closing valve 6 may have other valve structures capable of realizing an opening/closing function, and a person skilled in the art may flexibly set specific structures of the first opening/closing valve and the second opening/closing valve 6 and select types of the first opening/closing valve and the second opening/closing valve 6 in practical use. The throttle element 4 may be a throttle valve or the like. A stop valve may be provided between the outlet of the condenser 2 and the second opening/closing valve 6 and the refrigerant pump 5.
As shown in fig. 2, the control method of the present invention includes: when the air conditioning unit is in an abnormal working condition, acquiring the temperature of the compressor 3 and judging whether the air conditioning unit meets the starting condition of the refrigerant pump 5; if the temperature of the compressor 3 is greater than the first preset temperature, the first opening-closing valve is opened and the second opening-closing valve 6 is closed; and if the air conditioning unit meets the starting condition of the refrigerant pump 5, starting the refrigerant pump 5 to operate. The temperature of the compressor 3 may be the temperature of an inverter of the compressor 3, or the temperature of a surface of a motor of the compressor 3, or the temperature of an inner wall of a casing near an electronic component of the compressor 3, and a person skilled in the art may flexibly select any component of the compressor 3 as the temperature detected by the compressor 3 in practical application, and the temperature of the compressor 3 may be directly detected by a temperature sensor, or calculated by an operating current of the compressor 3. If the condition that the temperature of the compressor 3 is greater than the first preset temperature is met before the air conditioning unit meets the starting condition of the refrigerant pump 5, the first opening and closing valve at the cooling port 31 of the compressor 3 is opened and the second opening and closing valve 6 is closed, at this time, the air conditioning unit can wait until the starting condition of the refrigerant pump 5 is met, and then the refrigerant pump 5 flowing out of the condenser 2 is pumped into the cooling port 31 of the compressor 3 through the refrigerant pump 5, so that the electronic elements of the compressor 3 are cooled. If the condition that the temperature of the compressor 3 is greater than the first preset temperature is met simultaneously with the condition that the air conditioning unit meets the starting condition of the refrigerant pump 5, the first opening and closing valve at the cooling port 31 of the compressor 3 is opened, the second opening and closing valve 6 is closed, at the moment, the refrigerant pump 5 is also started, and the refrigerant pump 5 flowing out of the condenser 2 is pumped into the cooling port 31 of the compressor 3 through the refrigerant pump 5, so that the electronic elements of the compressor 3 are cooled. If the condition that the temperature of the compressor 3 is greater than the first preset temperature is met after the air conditioning unit meets the condition that the starting condition of the refrigerant pump 5 is met, the refrigerant pump 5 is started at this time, but the first on-off valve at the cooling port 31 of the compressor 3 is closed, in order to avoid continuous increase of the pipeline pressure, the second on-off valve 6 can be opened, so that the refrigerant flowing out of the condenser 2 is bypassed in a loop formed by the refrigerant pump 5 and the second on-off valve 6 (of course, the refrigerant flowing out of the refrigerant pump 5 can be recirculated back to the condenser 2 through the pipeline), and when the temperature of the compressor 3 is greater than the first preset temperature and the first on-off valve is opened, the bypass circulation is stopped, and the refrigerant pump 5 flowing out of the refrigerant pump 5 is pumped into the cooling port 31 of the compressor 3, so as to cool the electronic components of the compressor 3.
In the above, the refrigerant pump 5 start-up conditions include: the water inlet temperature of the evaporator 1 is greater than the water inlet temperature of the condenser 2, the duration time reaches a first preset time, and the rotating speed of the compressor 3 is greater than a first preset rotating speed, and/or the water inlet temperature of the evaporator 1 is less than or equal to the water inlet temperature of the condenser 2, the duration time reaches a second preset time, the rotating speed of the compressor 3 is greater than the second preset rotating speed, the ratio of the cylinder pressure of the condenser 2 to the cylinder pressure of the evaporator 1 is less than a first preset value, and/or the temperature of the compressor 3 is greater than the second preset temperature, the duration time reaches a third preset time, and the second preset temperature is greater than the first preset temperature. In a preferred case, the starting conditions of the refrigerant pump 5 include the above three conditions, that is, the water inlet temperature of the evaporator 1 is higher than the water inlet temperature of the condenser 2, the duration time reaches a first preset time, and the rotation speed of the compressor 3 is higher than the first preset rotation speed, and the water inlet temperature of the evaporator 1 is lower than or equal to the water inlet temperature of the condenser 2, the duration time reaches a second preset time, the rotation speed of the compressor 3 is higher than the second preset rotation speed, and the ratio of the cylinder pressure of the condenser 2 to the cylinder pressure of the evaporator 1 is lower than the first preset value, and the temperature of the compressor 3 is higher than the second preset temperature, and the duration time reaches a third preset time, wherein the second preset temperature is higher than the first preset temperature. That is, when the air conditioner set satisfies at least one of the three conditions, the refrigerant pump 5 start condition is satisfied, and the refrigerant pump 5 is controlled to start. Of course, the starting condition of the refrigerant pump 5 may be other conditions, and those skilled in the art may flexibly set the starting condition of the refrigerant pump 5 in practical applications. In addition, in practical applications, a person skilled in the art can flexibly set the first preset time, the second preset time, the third preset time, the first preset rotation speed, the second preset rotation speed, the first preset value, the first preset temperature, and the second preset temperature in the above description, where the first preset time may be equal to the second preset time, or may not be equal to the second preset time, and the first preset rotation speed may be equal to the second preset rotation speed, or may not be equal to the second preset rotation speed. In one possible scenario, the first preset time and the second preset time are both 10 seconds, the third preset time is 3 seconds, the first preset rotation speed and the second preset rotation speed are both 3000 rpm, the first preset value is 1.5, the first preset temperature is 44 degrees celsius, and the second preset temperature is 48 degrees celsius.
The control method of the present invention further includes: judging whether the air conditioning unit meets the stop condition of the refrigerant pump 5 or not in the running process of the refrigerant pump 5; and if the air conditioning unit meets the stop condition of the refrigerant pump 5, stopping the operation of the refrigerant pump 5. And if the air conditioning unit does not meet the stop condition of the refrigerant pump 5, keeping the refrigerant pump 5 in operation.
In the above, the refrigerant pump 5 stop conditions include: the compressor 3 stops running, and/or the water inlet temperature of the evaporator 1 is less than or equal to the water inlet temperature of the condenser 2, the duration of the water inlet temperature reaches a fourth preset time, the ratio of the cylinder pressure of the condenser 2 to the cylinder pressure of the evaporator 1 is greater than a second preset value, the temperature of the compressor 3 is less than or equal to a third preset temperature, the duration of the compressor 3 reaches a fifth preset time, and the third preset temperature is greater than the first preset temperature. In a preferred case, the refrigerant pump 5 stop condition includes both of the above two conditions, that is, the conditions include: the compressor 3 stops rotating, the water inlet temperature of the evaporator 1 is less than or equal to the water inlet temperature of the condenser 2, the duration time reaches the fourth preset time, the ratio of the cylinder pressure of the condenser 2 to the cylinder pressure of the evaporator 1 is greater than the second preset value, the temperature of the compressor 3 is less than or equal to the third preset temperature, the duration time reaches the fifth preset time, and the third preset temperature is greater than the first preset temperature. That is, when the air conditioner set satisfies at least one of the two conditions, the refrigerant pump 5 stop condition is satisfied, and the refrigerant pump 5 is controlled to stop. Of course, the stop condition of the refrigerant pump 5 may be other conditions, and those skilled in the art can flexibly set the stop condition of the refrigerant pump 5 in practical applications. In addition, a person skilled in the art can flexibly set the fourth preset time, the fifth preset time, the second preset value and the third preset temperature in practical applications. In a possible case, the fourth preset time and the fifth preset time are both 10 seconds, the second preset value is 1.6, and the third preset temperature is 46 degrees celsius.
Preferably, the control method of the present invention further comprises: after the first opening-closing valve is opened and the second opening-closing valve 6 is closed, if the temperature of the compressor 3 is less than or equal to a fourth preset temperature, which is less than or equal to the first preset temperature, the first opening-closing valve is closed and the second opening-closing valve 6 is opened. Wherein, the person skilled in the art can flexibly set the fourth preset temperature (for example, 42 degrees celsius) in practical application. When the first opening/closing valve is closed and the second opening/closing valve 6 is opened, the refrigerant flowing out of the condenser 2 bypasses the circuit formed by the refrigerant pump 5 and the second opening/closing valve 6 if the refrigerant pump 5 is not stopped.
In another aspect, the control method of the present invention includes: when the air conditioning unit is in a normal working condition, acquiring the temperature of the compressor 3; if the temperature of the compressor 3 is greater than the fifth preset temperature, both the first open-close valve and the second open-close valve 6 are opened; closing the first and/or second opening-closing valve 6 if the temperature of the compressor 3 is less than or equal to the sixth preset temperature after the first and second opening-closing valves 6 are opened; and the sixth preset temperature is less than or equal to the fifth preset temperature, and the refrigerant pump 5 is always in a closed state when the air conditioning unit is in a normal working condition. In practical applications, a person skilled in the art may flexibly set the fifth preset temperature and the sixth preset temperature, for example, the fifth preset temperature may be 44 degrees celsius, and the sixth preset temperature may be 42 degrees celsius. In a possible case, the fifth preset temperature is equal to the first preset temperature and the sixth preset temperature is equal to the fourth preset temperature. That is to say, when the air conditioning unit is in the normal operating mode, the pressure of the air conditioning unit itself can satisfy the cooling of the compressor 3, at this time, if the temperature of the compressor 3 is too high, both the first opening/closing valve and the second opening/closing valve 6 are opened, the refrigerant flowing out of the condenser 2 can enter the cooling port 31 of the compressor 3 under the pressure, and further the electronic element of the compressor 3 is cooled, after the cooling of the compressor 3 is completed, at least one of the first opening/closing valve and the second opening/closing valve 6 can be closed, the supply of the refrigerant to the cooling port 31 of the compressor 3 is cut off, and when the air conditioning unit is in the normal operating mode, the refrigerant pump 5 is not started all the time.
In the present invention, the specific way of the air conditioning unit being in the normal operating condition or in the abnormal operating condition may be to determine whether the target parameter of the air conditioning unit belongs to the normal numerical range, if the target parameter belongs to the normal numerical range, the air conditioning unit is in the normal operating condition, and if the target parameter does not belong to the normal numerical range, the air conditioning unit is in the abnormal operating condition. The target parameter may be one or more, and the target parameter may be compared with a set value to determine whether the target parameter belongs to a normal numerical range, or the target parameter may be compared with the target parameter to determine whether the target parameter belongs to a normal numerical range. For example, when the unit pressure is greater than the set value, it is determined that the air conditioning unit is in a normal operating condition, and when the unit pressure is not greater than the set value, it is determined that the unit is in an abnormal operating condition. For another example, when the temperature of the inflow water of the evaporator 1 is not greater than the temperature of the inflow water of the condenser 2, it is determined that the air conditioning unit is in a normal working condition, and when the temperature of the inflow water of the evaporator 1 is greater than the temperature of the inflow water of the condenser 2, it is determined that the air conditioning unit is in an abnormal working condition.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (4)
1. A control method of an air conditioning unit comprises an evaporator, a condenser, a compressor and a throttling element, wherein the evaporator, the compressor, the condenser and the throttling element jointly form a refrigerant circulation loop,
it is characterized in that the compressor is provided with a cooling port, the cooling port is provided with a first on-off valve for controlling the opening and the closing of the cooling port, a refrigerant pump and a second on-off valve which are connected in parallel are arranged between the condenser and the cooling port,
the control method comprises the following steps:
when the air conditioning unit is in an abnormal working condition, acquiring the temperature of the compressor and judging whether the air conditioning unit meets a refrigerant pump starting condition or not;
if the temperature of the compressor is greater than a first preset temperature, opening the first open-close valve and closing the second open-close valve;
if the air conditioning unit meets the starting condition of the refrigerant pump, starting the refrigerant pump to operate;
the refrigerant pump start-up conditions include at least two of the following conditions 1 to 3, or condition 1 or condition 2:
condition 1: the water inlet temperature of the evaporator is higher than that of the condenser, the duration time reaches first preset time, and the rotating speed of the compressor is higher than first preset rotating speed;
condition 2: the water inlet temperature of the evaporator is less than or equal to the water inlet temperature of the condenser, the duration time reaches a second preset time, the rotating speed of the compressor is greater than a second preset rotating speed, and the ratio of the cylinder pressure of the condenser to the cylinder pressure of the evaporator is less than a first preset value;
condition 3: the temperature of the compressor is higher than a second preset temperature and the duration time reaches a third preset time, wherein the second preset temperature is higher than the first preset temperature;
the control method further comprises the following steps:
judging whether the air conditioning unit meets a refrigerant pump stop condition or not in the operation process of the refrigerant pump;
if the air conditioning unit meets the refrigerant pump stop condition, stopping the operation of the refrigerant pump;
the refrigerant pump stop conditions include the following conditions 4 and 5, or condition 5:
condition 4: the compressor is stopped in a state that the compressor is stopped,
condition 5: the temperature of intaking of evaporimeter is less than or equal to the temperature of intaking of condenser and duration reach fourth default time and the barrel pressure of condenser with the ratio of the barrel pressure of evaporimeter is greater than the second default just the temperature of compressor is less than or equal to third default temperature and duration and reaches fifth default time, wherein, the third is predetermine the temperature and is greater than first default temperature.
2. The control method according to claim 1, characterized in that said first preset time is equal to said second preset time, and said first preset rotation speed is equal to said second preset rotation speed.
3. The control method according to claim 1, characterized by further comprising:
after the first open-close valve is opened and the second open-close valve is closed, if the temperature of the compressor is less than or equal to a fourth preset temperature, closing the first open-close valve and opening the second open-close valve,
wherein the fourth preset temperature is less than or equal to the first preset temperature.
4. A control method according to any one of claims 1-3, characterized in that the temperature of the compressor is the temperature of the frequency converter of the compressor.
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