CN115875756A - Defrosting device and method of air conditioner and storage medium - Google Patents

Abstract

The embodiment of the application discloses defroster, defrosting method and storage medium of air conditioner for air conditioning equipment technical field, including: the system comprises a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device and a balance tank; and the control device is respectively connected with the first passage valve and the second passage valve and used for controlling the conduction of the air inlet and the first port of the first passage valve correspondingly connected with the target air heat exchanger and controlling the conduction of the first port and the second port of the second passage valve correspondingly connected with the target air heat exchanger when the target air heat exchanger needing defrosting exists, so that the liquid refrigerant generated by condensation in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank. In the embodiment of the application, the liquid refrigerant generated by defrosting flows into the balancing tank, and is introduced into the air inlet of the compressor through the balancing tank, so that the heat exchange effects of the target air heat exchanger and other air heat exchangers are effectively improved.

Description

Defrosting device and method of air conditioner and storage medium

Technical Field

The embodiment of the application relates to the technical field of air-conditioning equipment, in particular to a defrosting device, a defrosting method and a storage medium of an air conditioner.

Background

Compared with traditional heat supply modes such as coal burning, electric heating and the like, the air source heat pump air conditioner has higher performance coefficient, and has the advantages of cold and heat compromise, energy conservation and environmental protection.

When the outdoor temperature is low in winter, the outdoor unit of the air heat exchanger is prone to frosting when the air conditioner heats. The actual effect of the air source heat pump in winter heating is affected due to the problem of outdoor unit frosting. Especially in areas with high humidity in winter, the bottom of the outdoor unit is more prone to icing, and therefore the heating effect of the air conditioner is affected. In the existing air conditioner defrosting method, a subsystem defrosting operation mode aiming at an air conditioner outdoor unit is adopted, namely, in an air conditioner heating mode, a target air heat exchanger needing defrosting is defrosted, other air heat exchangers not needing defrosting continuously operate in the heating mode, and the target air heat exchanger reenters the heating operation mode after defrosting is finished.

However, during defrosting of the target air heat exchanger, liquid refrigerant generated by condensation tends to accumulate in the target air heat exchanger; meanwhile, liquid refrigerant generated by condensation easily flows into other air heat exchangers which are not defrosted, and the heat exchange effects of the target air heat exchanger and the other air heat exchangers are influenced.

Disclosure of Invention

The embodiment of the application provides a defrosting device and a defrosting method of an air conditioner and a storage medium, and the heat exchange effects of a target air heat exchanger and other air heat exchangers can be effectively improved.

The embodiment of the application provides a defroster of air conditioner is applied to and carries out the defrosting to air heat exchanger, includes: the system comprises a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device and a balance tank;

the exhaust port of the compressor is connected with the air inlet of each first passage valve, and the air inlet of the compressor is respectively connected with the exhaust port of each first passage valve and the first port of the balance tank;

the first port of each first channel valve is respectively connected with the first ports of different air heat exchangers, and the second port of each first channel valve is connected with the first port of the heat exchanger;

a second port of the balance tank is connected with a first port of each second passage valve, a second port of each second passage valve is respectively connected with second ports of different air heat exchangers, and a third port of each second passage valve is connected with a second port of the heat exchanger;

the control device is respectively connected with the first passage valve and the second passage valve and is used for controlling the conduction of the air inlet and the first port of the first passage valve correspondingly connected with the target air heat exchanger and controlling the conduction of the first port and the second port of the second passage valve correspondingly connected with the target air heat exchanger when a target air heat exchanger needing defrosting exists, so that liquid refrigerant generated by condensation in the target air heat exchanger flows into the balancing tank and is introduced into the air inlet of the compressor through the balancing tank.

Further, the first path valve is a four-way valve, and the second path valve includes a first valve and a second valve, wherein a second port of the air heat exchanger is connected to a first port of the first valve and a first port of the second valve, respectively, a second port of each first valve is connected to a second port of the balancing tank, and a second port of each second valve is connected to a second port of the heat exchanger;

the control device is specifically configured to control the air inlet and the first port of the four-way valve correspondingly connected to the target air heat exchanger to be connected, and control the first port and the second port of the first valve correspondingly connected to the target air heat exchanger to be connected.

Further, the method also comprises the following steps: a plurality of third valves and fourth valves;

the second port of each four-way valve is respectively connected with the first ports of different third valves; the first port of the heat exchanger is connected with the second port of each third valve;

and the first port of the balance tank is connected with the first port of the fourth valve, and the second port of the fourth valve is connected with the air inlet of the compressor.

Further, the size of the balancing tank is determined according to the volume of a single heat exchanger module in the air heat exchanger, the maximum through diameter of the fourth valve and the liquid guiding speed.

Further, the control device is connected to the third valve and the fourth valve, and is further configured to control the conduction of the air inlet and the first port of each four-way valve and the conduction of the second port and the exhaust port when the air conditioner operates in a cooling mode, control the closing of each first valve and the conduction of each second valve, control the conduction of each third valve and the conduction of the fourth valve, and control the opening of the fourth valve according to the relative conditions of the suction superheat degree of the compressor and the target temperature threshold.

Further, the control device is connected to the third valve and the fourth valve, and is further configured to, when the air conditioner is operating in a heating mode, control the conduction of the air inlet and the second port of each four-way valve and the conduction of the first port and the exhaust port, control the closing of each first valve and the conduction of each second valve, control the conduction of each third valve and the conduction of the fourth valve, and control the opening of the fourth valve according to the relative conditions of the suction superheat degree of the compressor and the target temperature threshold.

Further, the control device is connected to the air heat exchanger, and is further configured to control the target air heat exchanger to stop operating when the target heat exchanger is defrosted, control an air inlet of a four-way valve correspondingly connected to the target air heat exchanger to be communicated with a first port and a second port of the four-way valve to be communicated with an air outlet, control a second valve and a third valve correspondingly connected to the target air heat exchanger to be closed, control a first valve correspondingly connected to the target air heat exchanger to be communicated, and control the fourth valve to be closed.

The embodiment of the application also provides a defrosting method of the air conditioner, which comprises the following steps:

acquiring frosting degrees of a plurality of air heat exchangers in a heating mode;

determining a target air heat exchanger needing defrosting according to the frosting degree;

and defrosting the target air heat exchanger and keeping other air heat exchangers to operate the heating mode.

The embodiment of the present application further provides a defrosting device of an air conditioner, including:

the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the frosting degree of a plurality of air heat exchangers in a heating mode;

the determining unit is used for determining a target air heat exchanger needing defrosting according to the frosting degree;

and the execution unit is used for defrosting the target air heat exchanger and keeping other air heat exchangers to operate in the heating mode.

The embodiment of the present application further provides a defrosting device of an air conditioner, including:

the system comprises a central processing unit, a memory, an input/output interface, a wired or wireless network interface and a power supply;

the memory is a transient storage memory or a persistent storage memory;

the central processor is configured to communicate with the memory, and execute the instruction operations in the memory on a control plane functional entity to perform the above-described defrost method.

Embodiments of the present application also provide a computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the above-described defrost method.

According to the technical scheme, the embodiment of the application has the following advantages:

the embodiment of the application provides a defroster of air conditioner includes: the system comprises a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device and a balance tank; and the control device is respectively connected with the first passage valve and the second passage valve and used for controlling the conduction of the air inlet and the first port of the first passage valve correspondingly connected with the target air heat exchanger and controlling the conduction of the first port and the second port of the second passage valve correspondingly connected with the target air heat exchanger when the target air heat exchanger needing defrosting exists, so that the liquid refrigerant generated by condensation in the target air heat exchanger flows into the balance tank and is introduced into the air inlet of the compressor through the balance tank. In the embodiment of the application, the liquid refrigerant generated by defrosting flows into the balance tank and is introduced into the air inlet of the compressor through the balance tank, so that the liquid refrigerant accumulated in the target air heat exchanger is effectively reduced; and the liquid refrigerant generated in the defrosting process does not directly enter other air heat exchangers which are not defrosted, so that the heat exchange effects of the target air heat exchanger and the other air heat exchangers are effectively improved. By reasonably designing the volume of the balance tank, the balance tank can contain enough refrigerant liquid, and the risk of liquid return of the compressor at the moment of defrosting withdrawal is reduced; meanwhile, the refrigerant liquid contained in the balance tank can also return to the system in a short time, so that the lack of refrigerant in the operation process of the system is avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art according to these drawings.

FIG. 1 is a schematic view of an air conditioning system disclosed in an embodiment of the present application;

FIG. 2 is a schematic view of another air conditioning system disclosed in an embodiment of the present application;

FIG. 3 is a flow chart of defrosting an air conditioner according to the embodiment of the present application;

fig. 4 is a diagram of a defrosting apparatus of an air conditioner according to an embodiment of the present application;

fig. 5 is a diagram of a defrosting apparatus of another air conditioner disclosed in an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise explicitly stated or limited; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood as specific cases by those of ordinary skill in the art.

In the existing air conditioner defrosting method, a subsystem defrosting operation mode aiming at an air conditioner outdoor unit is adopted, namely, in an air conditioner heating mode, a target air heat exchanger needing defrosting is defrosted, other air heat exchangers not needing defrosting continuously operate in the heating mode, and the target air heat exchanger reenters the heating operation mode after defrosting is finished. However, in defrosting the target air heat exchanger, liquid refrigerant generated by condensation is easily accumulated in the target air heat exchanger; meanwhile, liquid refrigerant generated by condensation easily flows into other air heat exchangers which are not defrosted, and the heat exchange effect of the target air heat exchanger and the other air heat exchangers is influenced. Therefore, the embodiment of the present application provides a defrosting device of an air conditioner, which can effectively improve the heat exchange effect of a target air heat exchanger and other air heat exchangers, and is specifically shown in fig. 1 and fig. 2:

the embodiment of the application provides a defroster of air conditioner is applied to and carries out the defrosting to air heat exchanger, includes: a compressor 1, a heat exchanger 6, a first path valve assembly 2, a second path valve assembly (4 and 5), a control device and a balance tank 8; the first path valve assembly 2 includes a plurality of first path valves (first path valve components), which may be four-way valves, six-way valves, or a plurality of valves, and is not limited herein. The second path valve assembly (4 and 5) comprises a plurality of second path valves, and the second path valves can be three-way valves, four-way valves or a plurality of valves, and are not limited herein. It can be understood that the defrosting device and the air heat exchanger assembly 3 can be combined to form a heat pump air conditioning unit, the compressor 1 (compressor assembly) includes at least one compressor component, the compressor 1 is any one of a rotor compressor, a scroll compressor, a screw compressor, a centrifugal compressor or a magnetic levitation compressor, and is not limited herein; the compressor 1 may be a fixed frequency compressor or an inverter compressor, and is not limited herein. It can be understood that, in the embodiment of the present application, defrosting is mainly performed for a certain air heat exchanger in the air heat exchanger assembly 3, where the air heat exchanger assembly 3 includes at least two air heat exchangers (air heat exchanger modules), each air heat exchanger includes at least one air heat exchanger main body and at least one fan, the air heat exchanger main body may be a copper-tube aluminum fin heat exchanger or a microchannel heat exchanger, and is not limited herein specifically; the fan is a fixed-frequency fan or a variable-frequency fan, and is not limited in particular. The heat exchanger 6 is a cold/hot water heat exchanger, and may be a fluorine-water heat exchanger or a fluorine-air heat exchanger, which is not limited herein. The balancing tank 8 is any one of a tank type and a cartridge type container, and is not limited herein.

Specifically, an exhaust port of the compressor 1 is connected with a port D of an air inlet of each first passage valve 2, and an air inlet of the compressor 1 is respectively connected with a port S of the exhaust port of each first passage valve 2 and a port M of the first port of the balance tank 8; it will be appreciated that the exhaust and intake ports are also referred to as ports, and that the connections between the ports are primarily by way of piping connections. A first port C of each first channel valve 2 is connected with a first port F of different air heat exchangers 3, and a second port E of each first channel valve 2 is connected with a first port L of a heat exchanger 6; a second port N of the balance tank 8 is connected with a first port (port B of the 4) of each second passage valve (4 and 5); the second port (port A of 4 and 5) of each second channel valve (4 and 5) is respectively connected with the second port P of different air heat exchangers 3, and the third port (port B of 5) of each second channel valve (4 and 5) is connected with the second port R of the heat exchanger 6; the control device is respectively connected with the first passage valve 2 and the second passage valves (4 and 5) and is used for controlling the conduction of a port D of an air inlet of the first passage valve 2 and a port C of a first port correspondingly connected with a target air heat exchanger when the target air heat exchanger needing defrosting exists in the air heat exchanger assembly 3 and controlling the conduction of a first port and a second port of the second passage valves (4 and 5) correspondingly connected with the target air heat exchanger, namely the conduction of the ports A and B in the ports 4; so that the liquid refrigerant condensed in the object air heat exchanger flows into the balancing tank 8 and is introduced into the air inlet of the compressor 1 through the balancing tank 8. The liquid refrigerant generated by the condensation is first introduced into the balancing tank 8 and then the refrigerant in the balancing tank 8 is slowly introduced into the suction port of the compressor 1.

The embodiment of the application provides a defroster of air conditioner includes: the defrosting device comprises a compressor 1, a heat exchanger 6, a plurality of first passage valves 2, a plurality of second passage valves (4 and 5), a control device and a balance tank 8, wherein the control device is respectively connected with the first passage valves 2 and the second passage valves (4 and 5) and is used for controlling the conduction of a D port and a C port of an air inlet of the first passage valve 2 correspondingly connected with a target air heat exchanger and controlling the conduction of a first port and a second port of the second passage valve (4 and 5) correspondingly connected with the target air heat exchanger when the target air heat exchanger needing defrosting exists, so that liquid refrigerant generated by condensation in the target air heat exchanger flows into the balance tank 8 and is introduced into an air inlet of the compressor 1 through the balance tank 8. In the embodiment of the application, the liquid refrigerant generated by defrosting flows into the balance tank 8 and is introduced into the air inlet of the compressor 1 through the balance tank 8, so that the liquid refrigerant accumulated in the target air heat exchanger is effectively reduced; and the liquid refrigerant generated in the defrosting process does not directly enter other air heat exchangers which are not defrosted, so that the heat exchange effects of the target air heat exchanger and other air heat exchangers are effectively improved. It can be understood that, in the defrosting process, no large amount of liquid refrigerant is accumulated in the target air heat exchanger for defrosting, so that the heat transfer effect of the heat exchanger is enhanced, the defrosting time is shortened, and the defrosting efficiency is improved. Secondly, the liquid refrigerant produced in the defrosting process does not directly enter other air heat exchangers which are not defrosted, does not have adverse effect on the heat exchange of other air heat exchangers, and is favorable for avoiding the liquid return phenomenon caused by the deterioration of the heat exchange effect of the air heat exchangers.

In an implementation scheme, when the defrosting device and the air heat exchanger assembly 3 form a novel defrosting heat pump air conditioning unit, the air heat exchanger is divided into a plurality of air heat exchanger modules to be defrosted in sequence, the switching of operation modes is not required in the defrosting process, and the stability of the system is obviously improved. The heat exchanger of the use side still outputs heat to the user in the defrosting process, the heat required by defrosting comes from other air heat exchanger modules still used as evaporators, the fluctuation of the water temperature of the user side is small, and the indoor thermal comfort is guaranteed. The unit does not relate to heating/refrigerating operation mode switching when entering/exiting defrosting, thereby avoiding the large fluctuation of system pressure and the impact on the compressor 1, and ensuring the safe and stable operation of the system. Defrosting control is simple and reasonable, heat is supplied continuously in the defrosting process, and temperature fluctuation on the user side is small. The defrosting process is through reasonable drain, is showing the heat transfer effect who promotes defrosting heat exchanger module, effectively shortens the defrosting time, reduces the compressor 1 that the defrosting leads to simultaneously and breathes in the liquid back risk.

Preferably, the first path valve 2 is a four-way valve, at least two four-way valves (four-way valve components) form a four-way valve assembly 2, the second path valves (4 and 5) include a first valve 4 and a second valve 5, that is, the second path valve assembly includes a first valve component 4 and a second valve component 5, and the first valve 4 may be any one of a solenoid valve, an electric ball valve or an electronic expansion valve, which is not limited herein; the second valve 5 may be any one of an electronic expansion valve, an electric ball valve, and a thermal expansion valve, and is not limited herein. A second port P of the air heat exchanger 3 is connected with a first port A of the corresponding first valve 4 and a first port A of the corresponding second valve 5, a second port B of each first valve 4 is connected with a second port N of the balancing tank 8, and a second port B of each second valve 5 is connected with a second port R of the heat exchanger 6; and the control device is specifically used for controlling the conduction of a port D of an air inlet of the four-way valve 2 correspondingly connected with the target air heat exchanger and a port C of a first port, and controlling the conduction of a port A of a first valve 4 correspondingly connected with the target air heat exchanger and a port B of a second port correspondingly connected with the target air heat exchanger.

Further, the defrosting apparatus further includes: a third valve assembly 7 and a fourth valve 9; the third valve assembly 7 includes a plurality of third valves, and the third valves are any one of solenoid valves, electric ball valves, or electronic expansion valves, which are not limited herein. The fourth valve 9 is any one of an electronic expansion valve, an electric ball valve and a thermal expansion valve, and is not limited herein. A second port E of each four-way valve 2 is respectively connected with a first port A of a different third valve 7; a first port L of the heat exchanger 6 is connected with a second port B of each third valve 7; the second port N of the balancing tank 8 is connected to the second port B of each first valve 4, the first port M of the balancing tank 8 is connected to the first port a of the fourth valve 9, and the second port B of the fourth valve 9 is connected to the air inlet of the compressor 1. In one implementation, there is a one-to-one correspondence in the number of components in the four-way valve assembly 2, the air heat exchanger assembly 3, the first valve assembly 4, the second valve assembly 5, and the third valve assembly 7. It will be appreciated that the equalization tank 8, having a predetermined volume, is used to store refrigerant liquid. Specifically, the preset volume may be 0.2 or 0.3 cubic meter, and is not limited herein, preferably, the balance tank 8 with a suitable size needs to be selected according to the operation of the volume of a single heat exchanger module in the heat exchanger assembly 3, the through diameter (opening) of the fourth valve 9, the liquid guiding speed and the like. On one hand, the volume of the balance tank 8 needs to contain enough refrigerant liquid, so that the defrosting efficiency is improved, and the risk of liquid return of the compressor 1 at the moment of defrosting withdrawal is reduced; on the other hand, the refrigerant liquid contained in the equalization tank 8 needs to be returned to the system in a short time to prevent lack of refrigerant during operation of the system.

Specifically, a novel defrosting heat pump air conditioning unit includes: the system comprises a compressor 1, a four-way valve assembly 2, an air heat exchanger assembly 3, a first valve assembly 4, a second valve assembly 5, a heat exchanger 6, a third valve assembly 7, a balance tank 8 and a fourth valve 9; an exhaust port of the compressor 1 is connected with a D port of the four-way valve component 2, and an air suction port of the compressor 1 is connected with an S port of the four-way valve component 2 and a B port of the fourth valve 9; the port C of the four-way valve component 2 is connected with the port F of the air heat exchanger component 3, and the port E of the four-way valve component 2 is connected with the port A of the third valve component 7; the port B of the third valve component 7 is connected with the port L of the heat exchanger 6; the port P of the air heat exchanger assembly 3 is connected with the port A of the first valve assembly 4 and the port A of the second valve assembly 5; the port B of the first valve component 4 is connected with the port N of the balance tank 8; the port M of the balance tank 8 is connected with the port A of the fourth valve 9; the port B of the second valve assembly 5 is connected to the port R of the heat exchanger 6. The compressor 1, the four-way valve assembly 2, the air heat exchanger assembly 3, the first valve assembly 4, the second valve assembly 5, the third valve assembly 7, the balance tank 8 and the fourth valve 9 are connected through pipelines, and the defrosting process of the air heat exchanger assembly 3 is completed on the premise that the heat pump air conditioning unit is not switched between heating and refrigerating modes. Through optimizing air conditioning unit essential element, rationally arranging each essential element simultaneously, carry out reasonable logic control to whole air conditioning unit at last, can ensure the steady operation of air conditioner, improve the comprehensive properties of air conditioner, alleviate the harmful effects of defrosting process to the system, ensure user's thermal comfort simultaneously.

Further, the control device is connected to the third valve 7 and the fourth valve 9, and is further configured to control each four-way valve in the four-way valve assembly 2 to maintain a power-off state when the air conditioner is operating in the cooling mode, control an air inlet D port of each four-way valve to be communicated with a first port C and a second port E port of each four-way valve to be communicated with an air outlet S, simultaneously control each first valve in the first valve assembly 4 to be closed and each second valve in the second valve assembly 5 to be communicated (opened), and control each third valve in the third valve assembly 7 to be communicated and the fourth valve 9 to be communicated. In one realizable scheme, the four-way valve assembly 2 comprises three four-way valves, the air heat exchanger assembly 3 comprises three air heat exchangers, each air heat exchanger is a V-shaped copper tube aluminum fin heat exchanger, the first valve assembly 4 comprises three solenoid valves, the second valve assembly 5 comprises three electronic expansion valves, the heat exchanger 6 is a dry type fluorine-water heat exchanger, the third solenoid valve assembly 7 comprises three solenoid valves, the balance tank 8 is a tank type container, and the fourth valve 9 is an electronic expansion valve. In a refrigeration mode, the heat exchanger 6 provides cold water, the load of the compressor 1 is controlled by the temperature of the cold water of the heat exchanger 6, the higher the temperature of the cold water is, the higher the load is, the ports D and C of the three four-way valves in the four-way valve assembly 2 are communicated, the ports S and E are communicated, all three air heat exchanger modules in the air heat exchanger assembly 3 are used as condensers to dissipate heat to air, all three electromagnetic valves in the first valve assembly 4 are closed, all three electronic expansion valves in the second valve assembly 5 are opened, the opening degree is controlled by the suction superheat degree of an air inlet of the compressor 1, the heat exchanger 6 can provide cold water for the dry type fluorine-water heat exchanger as an evaporator, all three electromagnetic valves in the third valve assembly 7 are opened, and the fourth valve 9 can be opened for the electronic expansion valves and controls the opening degree of the fourth valve 9 according to the relative condition of the suction superheat degree of the compressor 1 and a target temperature threshold value. The target temperature threshold (control target value) may be 3 ℃ or 5 ℃, and is not limited herein, and preferably, the target temperature threshold is 4 ℃. Specifically, when the suction superheat degree is less than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be reduced, when the suction superheat degree is greater than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be increased, and when the suction superheat degree is equal to the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be maintained.

The corresponding refrigeration cycle of the air conditioning unit: the high-temperature high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 1 enters a D port of a four-way valve in a four-way valve component 2, then enters an air heat exchanger component 3 through a C port of the four-way valve 2 and exchanges heat with air and condenses in the air, the condensed normal-temperature high-pressure liquid refrigerant is throttled by an electronic expansion valve of a second valve component 5 to become a low-temperature low-pressure gas-liquid two-phase refrigerant, then enters a heat exchanger 6 (dry fluorine-water heat exchanger) and exchanges heat with cold water and evaporates in the air, the evaporated low-temperature low-pressure gaseous refrigerant passes through an electromagnetic valve of a third valve component 7 and enters an E port of the four-way valve in the four-way valve component 2, and finally reaches an air suction port of the compressor component 1 through an S port of the four-way valve to return to the compressor 1, so that a complete refrigeration mode cycle is completed. Meanwhile, the fourth valve 9 (electronic expansion valve) is opened, the opening degree is controlled by the suction superheat degree, when the refrigerant still accumulates in the balance tank 8, the refrigerant in the balance tank 8 leaves the balance tank 8 from the opening M, is throttled by the fourth valve 9 to become low-temperature low-pressure gas-liquid two-phase refrigerant, and is merged with the gas refrigerant from the heat exchanger 6 to return to the suction port of the compressor 1, so that the refrigerant cannot accumulate in the balance tank 8 for a long time in the non-defrosting process.

Further, the control device is connected to the third valve 7 and the fourth valve 9, and is further configured to, when the air conditioner is operating in the heating mode, control each four-way valve in the four-way valve assembly 2 to remain in an energized state, control the air inlet D port of each four-way valve to be in communication with the second port E port and the first port C port of each four-way valve to be in communication with the exhaust port S port, control each first valve in the first valve assembly 4 to be closed and each second valve in the second valve assembly 5 to be in communication, and control each third valve in the third valve assembly 7 to be in communication and the fourth valve 9 to be in communication. In the above implementation scheme, in the heating mode, the heat exchanger 6 provides hot water, the load of the compressor 1 is controlled by the hot water temperature, the ports D and E of the three four-way valves in the four-way valve assembly 2 are communicated, the port S is communicated with the port C, all three air heat exchangers in the air heat exchanger assembly 3 are used as evaporators to absorb heat from air, all three solenoid valves in the first valve assembly 4 are closed, all three electronic expansion valves in the second valve assembly 5 are opened, the opening degrees of the three electronic expansion valves are controlled by the corresponding outlet superheat degrees of the air heat exchanger module 3, the heat exchanger 6 (dry fluorine-water heat exchanger) is used as a condenser to provide hot water, all three solenoid valves in the third valve assembly 7 are opened, the fourth valve 9 (electronic expansion valve) is opened, and the opening degree of the fourth valve 9 is controlled according to the relative conditions of the suction superheat degree of the compressor 1 and the target temperature threshold value. Preferably, the target temperature threshold is 4 ℃. Specifically, when the suction superheat degree is less than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be reduced, when the suction superheat degree is greater than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be increased, and when the suction superheat degree is equal to the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be maintained.

And (3) heating circulation of the corresponding air conditioning unit: the high-temperature high-pressure gaseous refrigerant discharged from the exhaust port of the compressor 1 enters the D port of the four-way valve component 2, then passes through the E port of the four-way valve, flows through the electromagnetic valve of the third valve component 7, enters the heat exchanger 6 (dry fluorine-water heat exchanger) and exchanges heat and condenses with hot water in the heat exchanger, the condensed normal-temperature high-pressure liquid refrigerant is throttled by the electronic expansion valve of the second valve component 5 to become low-temperature low-pressure gas-liquid two-phase refrigerant, then enters the air heat exchanger component 3 and exchanges heat and evaporates with air in the air heat exchanger, the evaporated low-temperature low-pressure gaseous refrigerant enters the C port of the four-way valve component 2, finally reaches the air suction port of the compressor 1 through the S port of the four-way valve and returns to the compressor 1, and a complete heating mode cycle is completed. Meanwhile, the fourth valve 9 (electronic expansion valve) is opened and the opening degree is controlled by the suction superheat degree, when the refrigerant is still accumulated in the balance tank 8, the refrigerant in the balance tank 8 leaves the balance tank 8 from the opening M, is throttled by the fourth valve 9 to become low-temperature low-pressure gas-liquid two-phase refrigerant, and is converged with the gas refrigerant from the air heat exchanger assembly 3 to return to the suction port of the compressor 1, so that the refrigerant is not accumulated in the balance tank 8 for a long time in the non-defrosting process.

Further, the control device is connected with each air heat exchanger and is further used for controlling the four-way valve 2 correspondingly connected with the target air heat exchanger to be switched from a power-on state to a power-off state when the air conditioner is operated in a heating mode and defrosting of the target air heat exchanger is required, the corresponding air inlet D port is communicated with the first port C port and the corresponding second port E port is communicated with the exhaust port S port, the second valve 5 and the third valve 7 correspondingly connected with the target air heat exchanger are controlled to be closed, and the first valve 4 correspondingly connected with the target air heat exchanger is controlled to be communicated. After the target air heat exchanger finishes defrosting, the four-way valve corresponding to the target air heat exchanger in the four-way valve assembly 2 is switched from a power-off state to a power-on state, the corresponding port D and the port E are communicated, the port C and the port S are communicated, meanwhile, the second valve corresponding to the target air heat exchanger in the second valve assembly 5 is opened, the third valve corresponding to the target air heat exchanger in the third valve assembly 7 is opened, in addition, the first valve corresponding to the target air heat exchanger in the first valve assembly 4 is closed, and the fourth valve 9 is controlled to be closed. When the target air heat exchanger exits defrosting, the opening degree of the fourth valve 9 is controlled according to the relative condition of the suction superheat degree of the compressor 1 and the target temperature threshold value. Preferably, the target temperature threshold is 4 ℃. Specifically, when the suction superheat degree is less than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be reduced, when the suction superheat degree is greater than the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be increased, and when the suction superheat degree is equal to the target temperature threshold of the fourth valve 9, the opening degree of the fourth valve 9 is controlled to be maintained.

In the above implementation, during the operation in the heating mode, if the target air heat exchanger 1 in the air heat exchanger assembly 3 meets the defrosting condition. At this time, the four-way valve 1 in the four-way valve assembly 2 is switched to the D port and C port conduction and the S port and E port conduction, and the solenoid valve 1 in the first valve assembly 4 is opened. When one existing air heat exchanger is defrosting, other air heat exchangers meet defrosting conditions, the air heat exchanger module is not allowed to enter defrosting immediately, and after the defrosting of the defrosting air heat exchanger module exits, other air heat exchanger modules are allowed to enter defrosting. When the target air heat exchanger 1 in the air heat exchanger assembly 3 completes defrosting and meets the condition of quitting defrosting, the four-way valve 1 in the four-way valve assembly 2 is switched to be communicated with the port D and the port E and to be communicated with the port S and the port C, the electromagnetic valve 1 in the first valve assembly 4 is closed, and the system returns to a normal heating mode to operate.

And (3) corresponding defrosting circulation of the air conditioning unit: high-temperature high-pressure gaseous refrigerant discharged from an exhaust port of the compressor assembly 1 enters a port D of a four-way valve of the four-way valve assembly 2, a part of the high-temperature high-pressure gaseous refrigerant enters a target air heat exchanger 1 in the air heat exchanger assembly 3 through a port C of the four-way valve 1 in the four-way valve assembly 2, is condensed and releases heat in the target air heat exchanger 1 to melt a frost layer outside the target air heat exchanger 1, and condensed normal-temperature high-pressure liquid refrigerant passes through a solenoid valve 1 in a first valve assembly 4, enters a balance tank 8 from a port N of the balance tank 8 through a liquid discharge pipeline, leaves the balance tank 8 from a port M of the balance tank 8, is throttled by a fourth valve 9 to become gas-liquid two-phase refrigerant and is converged with superheated gas refrigerant from a non-defrosting air heat exchanger module. The other part of high-temperature high-pressure gaseous refrigerant discharged from the compressor 1 passes through the four-way valve 2 in the four-way valve assembly 2 and the E port of the four-way valve 3, flows through the solenoid valve 2 and the solenoid valve 3 in the third valve assembly 7, enters the cold/hot water heat exchanger 6, exchanges heat with hot water in the cold/hot water heat exchanger and condenses, the condensed normal-temperature high-pressure liquid refrigerant is throttled into low-temperature low-pressure gas-liquid two-phase refrigerant through the electronic expansion valve 2 and the electronic expansion valve 3 in the second valve assembly 5, enters the air heat exchanger 2 and the air heat exchanger 3 in the air heat exchanger assembly 3, exchanges heat with air in the air heat exchanger and evaporates, the evaporated low-temperature low-pressure gaseous refrigerant enters the C port of the four-way valve in the four-way valve assembly 2, passes through the S port of the four-way valve in the four-way valve assembly 2, is converged with the refrigerant from the balancing tank 8, and finally reaches the air suction port of the compressor 1 to complete defrosting cycle.

In the defrosting process, the defrosting air heat exchanger module and the non-defrosting air heat exchanger module are relatively independent, liquid refrigerant generated by condensation of the defrosting air heat exchanger module enters the balancing tank 8 through the liquid drainage pipeline, and then slowly returns to the air suction pipeline of the compressor 1 through the liquid guide pipeline. On one hand, no large amount of liquid refrigerant is accumulated in the defrosting air heat exchanger module in the defrosting process, the heat exchange effect is obviously enhanced, the defrosting efficiency is improved, and the defrosting time is shortened. On the other hand, in the defrosting process, liquid refrigerants generated by condensation of the defrosting air heat exchanger module do not directly enter other non-defrosting air heat exchanger modules, adverse effects on the non-defrosting air heat exchanger modules are avoided, and the condition that the heat transfer effect of the frosted air heat exchanger modules is weakened due to the fact that a large amount of liquid refrigerants enter the frosting air heat exchanger modules, the superheat degree of outlets is reduced and finally the air suction liquid return of the compressor 1 is caused is avoided. In addition, the flow of the refrigerant entering each air heat exchanger module in the heating mode is independently controlled by the corresponding valve component, so that the problem of unreasonable refrigerant distribution in the heat exchange in the heating mode is solved, and the heat exchange area of the heat exchange is utilized to the maximum. And the defrosting is carried out without switching heating/refrigerating modes, and the system stability is obviously improved. The heat required by the air heat exchanger module entering defrosting comes from other air heat exchanger modules still serving as evaporators, so that the influence of the defrosting process on a user side is greatly reduced, and the temperature of hot water is prevented from being greatly fluctuated. In addition, the liquid refrigerant generated by the condensation of the defrosting air heat exchanger module during defrosting is firstly introduced into the balancing tank 8, and then the refrigerant in the balancing tank 8 is slowly introduced into the suction port of the compressor 1. In the defrosting process, no large amount of liquid refrigerant is accumulated in the defrosting air heat exchanger module, so that the heat transfer effect of the heat exchanger is enhanced, the defrosting time is shortened, and the defrosting efficiency is improved. Secondly, the liquid refrigerant generated in the defrosting process does not directly enter other air heat exchanger modules with frost, does not have adverse effect on the heat exchange of the air heat exchanger modules without defrosting, and is favorable for avoiding the liquid return phenomenon caused by the deterioration of the heat exchange effect of the air heat exchanger modules.

The embodiment of the application further provides a defrosting method of an air conditioner, as shown in fig. 3, the specific steps are as follows:

301. and acquiring the frosting degree of the plurality of air heat exchangers in the heating mode.

The defrosting device can acquire the frosting degree of a plurality of air heat exchangers (air heat exchanger modules) on the air conditioning unit in the heating mode in real time, and the plurality of air heat exchangers (air heat exchanger modules) are connected in parallel. It can be understood that, the air conditioning unit generally starts the heating mode when the external environment temperature is low, and therefore, in the process of the air conditioning unit operating the heating mode, a frosting phenomenon may occur in a certain air heat exchanger in the air heat exchanger assembly, and the defrosting device may determine a frosting degree of each air heat exchanger by using a temperature sensor or a camera, and the frosting degree may refer to a frosting thickness or a frosting area, which is not limited herein.

302. And determining a target air heat exchanger needing defrosting according to the frosting degree.

The defrosting means may determine a target air heat exchanger to be defrosted according to the degree of frosting. Specifically, the defrosting device may determine a target air heat exchanger to be defrosted according to the frosting thickness, and if the frosting thickness of one air heat exchanger reaches a preset thickness, it may be determined that the air heat exchanger satisfies a defrosting condition, and the target air heat exchanger is a target air heat exchanger to be defrosted. The predetermined thickness may be 5mm or 8mm, and is not limited herein.

303. And defrosting the target air heat exchanger and keeping the other air heat exchangers to operate in a heating mode.

The defrosting device defrosts the target air heat exchanger, and particularly, may use a high-temperature and high-pressure refrigerant to flow through the target air heat exchanger to defrost the target air heat exchanger. Meanwhile, other air heat exchangers which do not reach the defrosting condition continue to run in the heating mode. It can be understood that, when defrosting is performed, a group of air heat exchangers is generally used for defrosting, and when one group of air heat exchangers exists in the air heat exchanger assembly and defrosting is performed, other air heat exchangers are not allowed to be defrosted; after the defrosting of the air heat exchanger for defrosting is finished, other air heat exchangers meeting the defrosting condition are allowed to enter the defrosting mode; the air heat exchanger meeting the defrosting condition and having long duration preferentially enters defrosting.

In the embodiment of the application, the air heat exchanger module which firstly enters the defrosting process is judged as the defrosting condition according to the frosting degree of each group of air heat exchanger modules in the air heat exchanger assembly in the heating process. The air heat exchanger assembly is divided into a plurality of modules which are connected in parallel, and each air heat exchanger module is enabled to defrost in sequence according to the frosting degree of each air heat exchanger module.

An embodiment of the present application further provides a defrosting apparatus for an air conditioner, as shown in fig. 4, including:

an obtaining unit 401, configured to obtain frosting degrees of the multiple air heat exchangers in the heating mode;

a determining unit 402, configured to determine, according to the frosting degree, a target air heat exchanger that needs to be defrosted;

and an execution unit 403, configured to defrost the target air heat exchanger and keep the other air heat exchangers operating in the heating mode.

An embodiment of the present application further provides a defrosting apparatus 500 of an air conditioner, as shown in fig. 5, including:

a central processing unit 501, a memory 502, an input/output interface 503, a wired or wireless network interface 504, and a power supply 505;

the memory 502 is a transient storage memory or a persistent storage memory;

the cpu 501 is configured to communicate with the memory 503, and execute the instruction operations in the memory 503 on a control plane functional entity to execute the defrosting method described above.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and the like.

Claims (11)

1. The utility model provides a defroster of air conditioner, is applied to and carries out the defrosting to air heat exchanger which characterized in that includes: the system comprises a compressor, a heat exchanger, a plurality of first passage valves, a plurality of second passage valves, a control device and a balance tank;

the exhaust port of the compressor is connected with the air inlet of each first passage valve, and the air inlet of the compressor is respectively connected with the exhaust port of each first passage valve and the first port of the balance tank;

the first port of each first channel valve is respectively connected with the first ports of different air heat exchangers, and the second port of each first channel valve is connected with the first port of the heat exchanger;

a second port of the balance tank is connected with a first port of each second passage valve, a second port of each second passage valve is respectively connected with second ports of different air heat exchangers, and a third port of each second passage valve is connected with a second port of the heat exchanger;

the control device is respectively connected with the first passage valve and the second passage valve and is used for controlling the conduction of an air inlet and a first port of the first passage valve correspondingly connected with the target air heat exchanger and controlling the conduction of a first port and a second port of the second passage valve correspondingly connected with the target air heat exchanger when the target air heat exchanger needing defrosting exists, so that liquid refrigerant generated by condensation in the target air heat exchanger flows into the balancing tank and is introduced into an air inlet of the compressor through the balancing tank.

2. The defroster according to claim 1, wherein the first passage valve is a four-way valve, and the second passage valve comprises a first valve and a second valve, wherein the second port of the air heat exchanger is connected to the first port of the first valve and the first port of the second valve, respectively, the second port of each of the first valves is connected to the second port of the surge tank, and the second port of each of the second valves is connected to the second port of the heat exchanger;

the control device is specifically used for controlling the conduction of an air inlet and a first port of a four-way valve correspondingly connected with the target air heat exchanger, and controlling the conduction of a first port and a second port of a first valve correspondingly connected with the target air heat exchanger.

3. The defroster of claim 2 further comprising: a plurality of third valves and fourth valves;

the second port of each four-way valve is respectively connected with the first ports of different third valves; the first port of the heat exchanger is connected with the second port of each third valve;

and the first port of the balance tank is connected with the first port of the fourth valve, and the second port of the fourth valve is connected with the air inlet of the compressor.

4. The defroster of claim 3 wherein the balance tank is sized according to a volume of a single heat exchanger module in the air heat exchanger, a maximum path of the fourth valve, and a drain velocity.

5. The defroster of claim 3, wherein the control means is connected to the third valve and the fourth valve, respectively, and is further configured to control the inlet of each of the four-way valves to be in communication with the first port and the second port to be in communication with the outlet when the air conditioner is operating in the cooling mode, to control each of the first valves to be closed and each of the second valves to be in communication, to control each of the third valves to be in communication and each of the fourth valves to be in communication, and to control the opening of the fourth valve based on the relative relationship between the suction superheat of the compressor and the target temperature threshold.

6. The apparatus as claimed in claim 3, wherein the control device is connected to the third valve and the fourth valve respectively, and further configured to control the inlet of each four-way valve to be communicated with the second port and the first port to be communicated with the outlet when the air conditioner is in the heating mode, control each first valve to be closed and each second valve to be communicated, control each third valve to be communicated and the fourth valve to be communicated, and control the opening of the fourth valve according to the relative relationship between the suction superheat degree of the compressor and the target temperature threshold.

7. The apparatus of claim 6, wherein the control device is connected to the air heat exchanger, and further configured to control the target air heat exchanger to stop operating when the target heat exchanger is defrosted, control an air inlet of a four-way valve correspondingly connected to the target air heat exchanger to be communicated with the first port and a second port of the four-way valve correspondingly connected to the target air heat exchanger to be communicated with an air outlet, control a second valve and a third valve correspondingly connected to the target air heat exchanger to be closed, and control a first valve correspondingly connected to the target air heat exchanger to be communicated and control the fourth valve to be closed.

8. A defrosting method of an air conditioner, comprising:

acquiring frosting degrees of a plurality of air heat exchangers in a heating mode;

determining a target air heat exchanger needing defrosting according to the frosting degree;

defrosting the target air heat exchanger and keeping other air heat exchangers to operate the heating mode.

9. A defrosting apparatus of an air conditioner, comprising:

the system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the frosting degree of a plurality of air heat exchangers in a heating mode;

the determining unit is used for determining a target air heat exchanger needing defrosting according to the frosting degree;

and the execution unit is used for defrosting the target air heat exchanger and keeping other air heat exchangers to operate in the heating mode.

10. A defrosting apparatus of an air conditioner, comprising:

the system comprises a central processing unit, a memory, an input/output interface, a wired or wireless network interface and a power supply;

the memory is a transient storage memory or a persistent storage memory;

the central processor is configured to communicate with the memory, the operations of the instructions in the memory being performed on a control plane functional entity to perform the method of claim 8.

11. A computer-readable storage medium comprising instructions that, when executed on a computer, cause the computer to perform the method of claim 8.

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