CN106642858B - Multi-split system and liquid drainage control method and device applied to multi-split system - Google Patents
Multi-split system and liquid drainage control method and device applied to multi-split system Download PDFInfo
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- CN106642858B CN106642858B CN201710021968.6A CN201710021968A CN106642858B CN 106642858 B CN106642858 B CN 106642858B CN 201710021968 A CN201710021968 A CN 201710021968A CN 106642858 B CN106642858 B CN 106642858B
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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
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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
- F25B2400/05—Compression system with heat exchange between particular parts of the system
- F25B2400/051—Compression system with heat exchange between particular parts of the system between the accumulator and another part of the cycle
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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
- F25B2400/05—Compression system with heat exchange between particular parts of the system
- F25B2400/053—Compression system with heat exchange between particular parts of the system between the storage receiver and another part of the system
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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
Abstract
The invention discloses a multi-split system, a liquid discharge control method and a liquid discharge control device applied to the multi-split system, wherein the multi-split system comprises: refrigerant storage jar, flowing back electronic expansion valve passes through the exit end of first pipeline and refrigerant storage jar and passes through the tube coupling, and the method includes: receiving a first control signal for controlling liquid drainage of a refrigerant storage tank; and controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control the liquid discharge of the refrigerant storage tank. The invention solves the problem that the refrigerant drainage of the refrigerant storage tank is controlled by the solenoid valve in the prior art, and the control mode is more complex, ensures the refrigerant circulation of the system, and improves the comfort and the reliability of the multi-split system.
Description
Technical Field
The invention relates to the technical field of multi-split systems, in particular to a multi-split system, and a liquid discharge control method and device applied to the multi-split system.
Background
The existing multi-split air conditioner (heat pump and heat recovery multi-split air conditioner) system is often provided with a large amount of refrigerant due to the installation characteristics of long distribution pipe and high drop height, and a refrigerant storage tank or a refrigerant adjusting tank is often arranged for well controlling the refrigerant amount of the system. Through the liquid storage and drainage control of the refrigerant storage (adjustment) tank, the refrigerant circulation quantity of the system is optimally controlled, and the comfort and reliability control of the system are ensured.
As shown in fig. 1, refrigerant drainage from a refrigerant storage tank of a conventional multiple on-line (heat pump or heat recovery) system is controlled by two solenoid valves: refrigeration flowing back solenoid valve and heating flowing back solenoid valve. When the unit operates in a refrigeration mode and needs to discharge the refrigerant in the refrigerant storage tank to a system for circulation, the refrigeration electromagnetic valve is opened, the heating electromagnetic valve is closed, and the refrigerant in the storage tank is discharged to the inlet pipe of the vapor-liquid separator through the refrigeration liquid discharge electromagnetic valve and directly enters the vapor separator; when the unit heating mode operation needs to discharge the refrigerant in the refrigerant storage tank to the system circulation, the heating solenoid valve is opened, the refrigeration solenoid valve is closed, the refrigerant in the storage tank is discharged to the inlet pipe of the outdoor unit heat exchanger through the heating liquid discharge solenoid valve, and then the refrigerant enters the steam separator through the outdoor heat exchanger and the four-way valve. When the machine set does not need to discharge liquid, the refrigeration and heating liquid discharge electromagnetic valves are closed.
The liquid discharge method of the traditional solenoid valve control can distinguish refrigeration and heating liquid discharge, the two solenoid valves are used for controlling, the unit load is large, the control is relatively complex, the liquid discharge rate cannot be controlled, and the liquid return of the system is easily caused.
Traditional refrigerant storage (adjustment) jar refrigerant flowing back passes through solenoid valve control, often divide into refrigeration and heating flowing back control, and control load is more and more troublesome. The control of the electromagnetic valve can not accurately control the liquid discharge speed of the refrigerant, and the large liquid discharge amount can cause the liquid return of the system, so that the liquid impact of the compressor is caused; when the liquid discharge amount is small, the refrigerant adjusting effect cannot be guaranteed in time, and the comfort of the system is affected.
Aiming at the problem that in the prior art, the refrigerant drainage of a multi-split air conditioner system to a refrigerant storage tank is controlled by an electromagnetic valve, and the control mode is complex, an effective solution is not provided at present.
Disclosure of Invention
The invention provides a multi-split air-conditioning system, and a liquid discharge control method and device applied to the multi-split air-conditioning system, and at least solves the problem that in the prior art, the multi-split air-conditioning system controls the liquid discharge of a refrigerant storage tank through an electromagnetic valve, and the control mode is complex.
In order to solve the above technical problem, according to an aspect of an embodiment of the present disclosure, the present invention provides a liquid discharge control method applied to a multi-split system, where the multi-split system includes: refrigerant storage jar, flowing back electronic expansion valve passes through the exit end of first pipeline and refrigerant storage jar and passes through the tube coupling, and the method includes: receiving a first control signal for controlling liquid drainage of a refrigerant storage tank; and controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control the liquid discharge of the refrigerant storage tank.
Further, the multi-split system further includes: heat exchanger and vapour and liquid separator, the heat exchanger passes through the second pipeline and is connected with flowing back electronic expansion valve, and the heat exchanger passes through the third pipeline and is connected with vapour and liquid separator, and the aforesaid controls flowing back electronic expansion valve's the open mode according to first control signal to the flowing back of control refrigerant storage jar includes: controlling the opening of the liquid discharge electronic expansion valve according to a first control signal so as to convey the refrigerant in the refrigerant storage tank to the position of the heat exchanger through a first pipeline and a second pipeline for evaporation; and controlling to convey the evaporated refrigerant to a gas-liquid separator.
Further, the multi-split system further includes: first flowing back thermal bulb and second flowing back thermal bulb, wherein, first thermal bulb sets up on the second pipeline, and the second thermal bulb sets up on the third pipeline, and the aforesaid controls the open mode of flowing back electronic expansion valve according to first control signal includes: acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; and controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank.
Further, according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb, a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve is generated, and the method comprises the following steps: calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; comparing the calculated difference with a preset drainage refrigerant target superheat degree; and generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the comparison result.
Further, generating a second control signal for controlling the opening degree of the drain liquid electronic expansion valve according to the comparison result includes: when the calculated difference is larger than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening of the drainage electronic expansion valve to increase; and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
According to another aspect of the embodiments of the present disclosure, there is provided a liquid discharge control apparatus applied to a multiple on-line system, wherein the multiple on-line system includes: refrigerant storage jar, flowing back electronic expansion valve pass through the exit end of first pipeline and refrigerant storage jar and pass through the tube coupling, and the device includes: the receiving unit is used for receiving a first control signal for controlling liquid drainage of the refrigerant storage tank; and the control unit is used for controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control the liquid discharge of the refrigerant storage tank.
Further, the multi-split system further includes: heat exchanger, vapour and liquid separator, first flowing back temperature sensing package, second flowing back temperature sensing package, wherein, the heat exchanger passes through the second pipeline to be connected with flowing back electronic expansion valve, and the heat exchanger passes through the third pipeline to be connected with vapour and liquid separator, and first temperature sensing package sets up on the second pipeline, and second temperature sensing package sets up on the third pipeline, and the control unit includes: the acquisition module is used for acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; the generating module is used for generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; and the control module is used for controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank.
Further, the generation module includes: the calculation submodule is used for calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; the comparison submodule is used for comparing the calculated difference with a preset liquid discharge refrigerant target superheat degree; the generation submodule is used for generating a second control signal for controlling the opening of the liquid discharge electronic expansion valve according to the comparison result, wherein the second control signal for controlling the opening of the liquid discharge electronic expansion valve to increase is generated when the calculated difference is greater than the preset liquid discharge refrigerant target superheat degree; and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
According to another aspect of the embodiments of the present disclosure, there is provided a liquid discharge control apparatus including: the liquid discharge electronic expansion valve is connected with the outlet end of the refrigerant storage tank through a first pipeline through a pipeline, and the controller controls liquid discharge of the refrigerant storage tank through the liquid discharge electronic expansion valve.
Further, the apparatus further comprises: the heat exchanger is connected with the liquid discharge electronic expansion valve through a second pipeline and connected with the gas-liquid separator through a third pipeline, and the heat exchanger is used for evaporating the refrigerant in the second pipeline into a gas state and conveying the gas-liquid into the gas-liquid separator through the third pipeline.
Further, the heat exchanger is a double pipe heat exchanger.
Further, the apparatus further comprises: the controller controls the opening state of the electronic liquid discharge expansion valve according to the temperatures detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb so as to control the liquid discharge speed of the refrigerant storage tank.
According to another aspect of the embodiments of the present disclosure, there is provided a multi-split system including the liquid discharge control apparatus described above.
In the invention, the electronic expansion valve is used for more accurately controlling the liquid discharge speed of the refrigerant storage (adjustment) tank of the multi-split air-conditioning system, so that the problem that the multi-split air-conditioning system is complex in control mode because the refrigerant liquid discharge of the refrigerant storage tank is controlled by the electromagnetic valve in the prior art is effectively solved, the refrigerant circulation quantity of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved.
Drawings
Fig. 1 is a schematic diagram of a configuration of a multi-split system in the prior art;
FIG. 2 is a schematic diagram of an alternative configuration of a multiple on-line system according to an embodiment of the invention;
FIG. 3 is an alternative flow chart of a method for controlling liquid drainage in a multiple on-line system according to an embodiment of the invention; and
fig. 4 is a block diagram of an alternative configuration of a drainage control device applied to a multi-split system according to an embodiment of the invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example 1
The following describes a liquid discharge control method applied to a multi-split system according to the present invention with reference to the accompanying drawings.
Fig. 2 is a schematic diagram illustrating an alternative structure of a multi-split system provided in the present invention, and as shown in fig. 2, the multi-split system includes: the electronic liquid drainage expansion valve is connected with the outlet end of the refrigerant storage tank through a first pipeline; further, the multi-split system further includes: the heat exchanger is connected with the liquid discharge electronic expansion valve through a second pipeline, and the heat exchanger is connected with the gas-liquid separator through a third pipeline, wherein the heat exchanger is preferably a double-pipe heat exchanger; further, the multi-split system further includes: the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb are arranged on the second pipeline, and the second temperature sensing bulb is arranged on the third pipeline.
In the system structure shown in fig. 2, a novel method for controlling the liquid drainage of the refrigerant by using the electronic expansion valve is adopted, and the refrigerant is drained from the liquid storage tank, passes through the electronic expansion valve and the double-pipe heat exchanger and then returns to the vapor branch inlet pipe. The electronic expansion valve can be used for controlling the liquid discharge rate of the refrigerant, and the sleeve type heat exchanger can ensure that the liquid discharge refrigerant can be quickly evaporated into a gaseous refrigerant to enter a vapor separator, so that the gaseous refrigerant can effectively circulate to the system, and the liquid return risk of the system is also reduced.
Fig. 3 shows an alternative flow chart of a liquid discharge control method applied to a multi-split system, which may include the following steps, as shown in fig. 3:
s302, receiving a first control signal for controlling liquid drainage of a refrigerant storage tank;
s304, controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control the liquid discharge of the refrigerant storage tank.
During the concrete realization, the aforesaid is according to the opening state of first control signal control flowing back electronic expansion valve to the flowing back of control refrigerant storage jar includes: controlling the opening of the liquid discharge electronic expansion valve according to a first control signal so as to convey the refrigerant in the refrigerant storage tank to the position of the heat exchanger through a first pipeline and a second pipeline for evaporation; and controlling to convey the evaporated refrigerant to a gas-liquid separator.
In the above embodiment provided by the invention, the electronic expansion valve is used to more accurately control the liquid discharge speed of the refrigerant storage (adjustment) tank of the multi-split air-conditioning system, so that the problem that the multi-split air-conditioning system is complex in control mode because the refrigerant discharge of the refrigerant storage tank is controlled by the electromagnetic valve in the prior art is effectively solved, the refrigerant circulation volume of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved.
Further, when the open state of the liquid discharge electronic expansion valve is controlled according to the first control signal, the method may include: acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; and controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank. The first control signal represents a control signal for judging whether the electronic expansion valve is opened or not (controlling whether liquid drainage or not), the second control signal represents a control signal for judging the specific opening degree of the electronic expansion valve (controlling the liquid drainage speed), and comprehensive control is carried out according to the two signals. In practical operation, only one of the two control signals may be applied, or the two control signals may be combined into one control signal, and the present invention is not limited thereto.
Preferably, the generating a second control signal for controlling the opening degree of the electronic expansion valve for draining liquid according to the temperature values detected by the first and second draining bulb comprises: calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; comparing the calculated difference with a preset drainage refrigerant target superheat degree; and generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the comparison result. When the calculated difference is greater than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening of the drainage electronic expansion valve to increase; and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
Specifically, the electronic liquid discharge expansion valve controls the opening degree of the liquid discharge bulb 1 and the liquid discharge bulb 2 by monitoring, so that the liquid discharge rate is ensured, and the liquid return of the system caused by liquid discharge is avoided. For example, the target superheat degree of the drainage refrigerant is controlled to be a (a is 1,2,3, etc.), the opening degree of the drainage electronic expansion valve is controlled by detecting the actual superheat degree (the difference between the temperature of the drainage bulb 2 and the temperature of the drainage bulb 1 is subtracted), and if the actual superheat degree is greater than a, the opening degree of the electronic expansion valve is increased; and if the actual superheat degree is less than A, closing the electronic expansion valve. The smaller the value a is set, the faster the coolant reservoir tank drains, and the larger the value a is set, the slower the coolant reservoir tank drains.
As can be seen from the above description, the invention is characterized in that: the liquid discharge speed of a refrigerant storage (adjustment) tank of the multi-split air-conditioning system is more accurately controlled by using the electronic expansion valve, the circulation volume of the refrigerant of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved; the use of the double-pipe heat exchanger is combined, so that the discharged liquid refrigerant is effectively ensured to be rapidly circulated into the system, the air suction quantity is increased, the air suction superheat degree is improved, and the liquid return of the system is reduced; and the use of the sleeve type heat exchanger is combined, the refrigerant circulation quantity can be improved when heating and defrosting are carried out, and the defrosting efficiency is improved.
The implementation of the scheme can solve the following technical problems:
1. the system control load is reduced, and the liquid discharge speed of a refrigerant storage (adjustment) tank of the multi-split air conditioner system is more accurately controlled;
2. by the optimized control of the liquid discharge refrigerant, the liquid return of the system is effectively avoided, and the air suction reliability of the compressor is ensured;
3. the defrosting efficiency of the system is improved by controlling the refrigerant storage (adjustment) refrigerant liquid drainage.
By implementing the scheme, the liquid discharge speed of the refrigerant storage (adjustment) tank in the multi-split air-conditioning system is accurately controlled, the refrigerant circulation volume of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved; by the optimized control of the liquid discharge refrigerant, the liquid return of the system is effectively avoided, and the long-term operation reliability of the compressor is improved; the heating defrosting efficiency of the system can be improved by controlling the refrigerant storage (adjustment) refrigerant liquid drainage.
Example 2
Based on the liquid discharge control method applied to the multi-split system provided in embodiment 1, an optional embodiment 2 of the present invention further provides a liquid discharge control device applied to the multi-split system, where the multi-split system includes: specifically, fig. 4 shows an optional structural block diagram of the apparatus, and as shown in fig. 4, the apparatus includes: the receiving unit 42 is configured to receive a first control signal for controlling liquid drainage of the refrigerant storage tank; and the control unit 44 is configured to control an opening state of the liquid discharge electronic expansion valve according to the first control signal, so as to control liquid discharge of the refrigerant storage tank.
Further, the multi-split system further includes: heat exchanger, vapour and liquid separator, first flowing back temperature sensing package, second flowing back temperature sensing package, wherein, the heat exchanger passes through the second pipeline to be connected with flowing back electronic expansion valve, and the heat exchanger passes through the third pipeline to be connected with vapour and liquid separator, and first temperature sensing package sets up on the second pipeline, and second temperature sensing package sets up on the third pipeline, and the control unit includes: the acquisition module is used for acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; the generating module is used for generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; and the control module is used for controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank.
Further, the generation module includes: the calculation submodule is used for calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb; the comparison submodule is used for comparing the calculated difference with a preset liquid discharge refrigerant target superheat degree; the generation submodule is used for generating a second control signal for controlling the opening of the liquid discharge electronic expansion valve according to the comparison result, wherein the second control signal for controlling the opening of the liquid discharge electronic expansion valve to increase is generated when the calculated difference is greater than the preset liquid discharge refrigerant target superheat degree; and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
With regard to the apparatus in the above embodiments, the specific manner in which each unit and each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail herein.
Example 3
According to another aspect of the embodiments of the present disclosure, there is provided a liquid discharge control apparatus and a multi-split system including the same, and fig. 2 illustrates an alternative structural block diagram, in which the liquid discharge control apparatus includes: the liquid discharge electronic expansion valve is connected with the outlet end of the refrigerant storage tank through a first pipeline through a pipeline, and the controller controls liquid discharge of the refrigerant storage tank through the liquid discharge electronic expansion valve.
Further, the apparatus further comprises: the heat exchanger is connected with the liquid discharge electronic expansion valve through a second pipeline and connected with the gas-liquid separator through a third pipeline, and the heat exchanger is used for evaporating the refrigerant in the second pipeline into a gas state and conveying the gas-liquid into the gas-liquid separator through the third pipeline.
Further, the heat exchanger is a double pipe heat exchanger.
Further, the apparatus further comprises: the controller controls the opening state of the electronic liquid discharge expansion valve according to the temperatures detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb so as to control the liquid discharge speed of the refrigerant storage tank.
According to another aspect of the embodiments of the present disclosure, there is provided a multi-split system including the liquid discharge control apparatus described above. And will not be described in detail herein.
As can be seen from the above description, the invention is characterized in that: the liquid discharge speed of a refrigerant storage (adjustment) tank of the multi-split air-conditioning system is more accurately controlled by using the electronic expansion valve, the circulation volume of the refrigerant of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved; the use of the double-pipe heat exchanger is combined, so that the discharged liquid refrigerant is effectively ensured to be rapidly circulated into the system, the air suction quantity is increased, the air suction superheat degree is improved, and the liquid return of the system is reduced; and the use of the sleeve type heat exchanger is combined, the refrigerant circulation quantity can be improved when heating and defrosting are carried out, and the defrosting efficiency is improved.
The implementation of the scheme can solve the following technical problems:
1. the system control load is reduced, and the liquid discharge speed of a refrigerant storage (adjustment) tank of the multi-split air conditioner system is more accurately controlled;
2. by the optimized control of the liquid discharge refrigerant, the liquid return of the system is effectively avoided, and the air suction reliability of the compressor is ensured;
3. the defrosting efficiency of the system is improved by controlling the refrigerant storage (adjustment) refrigerant liquid drainage.
By implementing the scheme, the liquid discharge speed of the refrigerant storage (adjustment) tank in the multi-split air-conditioning system is accurately controlled, the refrigerant circulation volume of the system is ensured, and the comfort and the reliability of the multi-split air-conditioning system are improved; by the optimized control of the liquid discharge refrigerant, the liquid return of the system is effectively avoided, and the long-term operation reliability of the compressor is improved; the heating defrosting efficiency of the system can be improved by controlling the refrigerant storage (adjustment) refrigerant liquid drainage.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A liquid discharge control method applied to a multi-split system is characterized in that the multi-split system comprises the following steps: the liquid discharge electronic expansion valve is connected with the outlet end of the refrigerant storage tank through a first pipeline through a pipeline, and the method comprises the following steps:
receiving a first control signal for controlling liquid drainage of a refrigerant storage tank;
controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control liquid discharge of the refrigerant storage tank; controlling the liquid discharge of the refrigerant storage tank comprises controlling the liquid discharge of the refrigerant storage tank in a refrigerating state and a heating state;
the multiple on-line system further comprises: the heat exchanger passes through the second pipeline and is connected with drainage electronic expansion valve, the heat exchanger passes through the third pipeline and is connected with vapour and liquid separator, according to first control signal control drainage electronic expansion valve's the open mode to control the flowing back of refrigerant storage jar includes:
controlling the opening of the liquid discharge electronic expansion valve according to the first control signal so as to convey the refrigerant in the refrigerant storage tank to the position of the heat exchanger through the first pipeline and the second pipeline for evaporation;
and controlling to convey the evaporated refrigerant to the gas-liquid separator.
2. The method of claim 1, wherein the multiple online system further comprises: first flowing back temperature sensing package and second flowing back temperature sensing package, wherein, first flowing back temperature sensing package set up in on the second pipeline, second flowing back temperature sensing package sets up on the third pipeline, according to first control signal control the open mode of flowing back electronic expansion valve includes:
acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
and controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank.
3. The method of claim 2, wherein generating a second control signal for controlling an opening degree of the bleed electronic expansion valve based on the temperature values detected by the first bleed bulb and the second bleed bulb comprises:
calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
comparing the calculated difference value with a preset liquid discharge refrigerant target superheat degree;
and generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the comparison result.
4. The method of claim 3, wherein generating a second control signal for controlling the opening degree of the bleed electronic expansion valve based on the comparison comprises:
when the calculated difference is larger than a preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening of the drainage electronic expansion valve to increase;
and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
5. A liquid discharge control device for a multiple on-line system, the multiple on-line system comprising: refrigerant storage jar, flowing back electronic expansion valve pass through first pipeline with the exit end of refrigerant storage jar passes through the tube coupling, the device includes:
the receiving unit is used for receiving a first control signal for controlling liquid drainage of the refrigerant storage tank;
the control unit is used for controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal so as to control liquid discharge of the refrigerant storage tank; controlling the liquid discharge of the refrigerant storage tank comprises controlling the liquid discharge of the refrigerant storage tank in a refrigerating state and a heating state;
the multiple on-line system further comprises: heat exchanger, vapour and liquid separator, first flowing back temperature sensing package, second flowing back temperature sensing package, wherein, the heat exchanger pass through the second pipeline with flowing back electronic expansion valve connects, the heat exchanger pass through the third pipeline with vapour and liquid separator connects, first flowing back temperature sensing package set up in on the second pipeline, second flowing back temperature sensing package sets up on the third pipeline, the control unit includes:
the acquisition module is used for acquiring temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
the generating module is used for generating a second control signal for controlling the opening degree of the liquid discharge electronic expansion valve according to the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
and the control module is used for controlling the opening state of the liquid discharge electronic expansion valve according to the first control signal and the second control signal so as to control liquid discharge of the refrigerant storage tank.
6. The apparatus of claim 5, wherein the generating module comprises:
the calculation submodule is used for calculating the difference value of the temperature values detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb;
the comparison submodule is used for comparing the calculated difference value with a preset liquid discharge refrigerant target superheat degree;
the generation submodule is used for generating a second control signal for controlling the opening of the liquid discharge electronic expansion valve according to the comparison result, wherein the second control signal for controlling the opening of the liquid discharge electronic expansion valve to increase is generated when the calculated difference value is larger than the preset liquid discharge refrigerant target superheat degree; and when the calculated difference is smaller than the preset drainage refrigerant target superheat degree, generating a second control signal for controlling the opening degree of the drainage electronic expansion valve to be reduced.
7. A liquid discharge control device, comprising: the liquid discharge electronic expansion valve is connected with the outlet end of the refrigerant storage tank through a first pipeline through a pipeline, and the controller controls liquid discharge of the refrigerant storage tank through the liquid discharge electronic expansion valve; controlling the liquid discharge of the refrigerant storage tank comprises controlling the liquid discharge of the refrigerant storage tank in a refrigerating state and a heating state;
further comprising: the heat exchanger is connected with the liquid discharge electronic expansion valve through a second pipeline and connected with the gas-liquid separator through a third pipeline, and the heat exchanger is used for evaporating the refrigerant in the second pipeline into a gaseous state and conveying the gaseous refrigerant into the gas-liquid separator through the third pipeline.
8. The liquid discharge control device of claim 7, wherein the heat exchanger is a double pipe heat exchanger.
9. The liquid discharge control device of claim 8, further comprising: the controller controls the opening state of the liquid discharge electronic expansion valve according to the temperatures detected by the first liquid discharge temperature sensing bulb and the second liquid discharge temperature sensing bulb so as to control the liquid discharge speed of the refrigerant storage tank.
10. A multi-split system comprising the liquid discharge control apparatus as claimed in any one of claims 7 to 9.
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| CN201710021968.6A CN106642858B (en) | 2017-01-12 | 2017-01-12 | Multi-split system and liquid drainage control method and device applied to multi-split system |
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| CN201710021968.6A CN106642858B (en) | 2017-01-12 | 2017-01-12 | Multi-split system and liquid drainage control method and device applied to multi-split system |
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| JPH08254376A (en) * | 1995-03-17 | 1996-10-01 | Mitsubishi Electric Corp | Air conditioner |
| CN201355152Y (en) * | 2008-11-12 | 2009-12-02 | 青岛海信日立空调系统有限公司 | Water-source variable-refrigerant-volume refrigeration system with subcooler control loop |
| CN201811509U (en) * | 2010-09-13 | 2011-04-27 | 广州天河兰石技术开发有限公司 | Refrigerating plant with adjustable evaporation pressure and flow |
| CN201935493U (en) * | 2011-03-01 | 2011-08-17 | 合肥天鹅制冷科技有限公司 | Liquid storage tank |
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