阅读说明：本技术 一种空调装置 (Air conditioner ) 是由 周敏 张恒 董辰 于 2020-06-04 设计创作，主要内容包括：本发明涉及一种空调装置,包括室外机,室外机包括压缩机、室外风扇和至少两个并联的室外支路,所述室外支路包括节流装置和室外换热器；所述空调装置还包括控制模块,用于在所述室外换热器的换热量大于需求换热量时,控制所述室外换热器与所述室外风扇产生的气流进行热交换的换热面积减小,以减少室外换热器的换热能力,保证压缩机运行的稳定性,提高压缩机的效率,降低耗电。(The invention relates to an air conditioning device, which comprises an outdoor unit, wherein the outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branches connected in parallel, and each outdoor branch comprises a throttling device and an outdoor heat exchanger; the air conditioning device also comprises a control module, which is used for controlling the heat exchange area of the outdoor heat exchanger and the air flow generated by the outdoor fan to exchange heat to be reduced when the heat exchange amount of the outdoor heat exchanger is larger than the required heat exchange amount, so as to reduce the heat exchange capacity of the outdoor heat exchanger, ensure the running stability of the compressor, improve the efficiency of the compressor and reduce the power consumption.)

1. An air conditioning device comprises an outdoor unit, and is characterized in that the outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branches connected in parallel, wherein each outdoor branch comprises a throttling device and an outdoor heat exchanger;

the air conditioning apparatus further includes:

and the control module is used for controlling the heat exchange area of the outdoor heat exchanger for carrying out heat exchange with the airflow generated by the outdoor fan to be reduced when the heat exchange amount of the outdoor heat exchanger is greater than the required heat exchange amount.

2. The air conditioning device according to claim 1, wherein the control module is configured to obtain the compressor discharge pressure Pd, and determine whether the heat exchange amount of the outdoor heat exchanger is greater than the required heat exchange amount according to the compressor discharge pressure Pd.

3. The air conditioner device as claimed in claim 2, wherein the control module is configured to obtain an operating frequency of the compressor, a rotation speed of the outdoor fan, and an operating mode of the air conditioner device, and is configured to determine that the heat exchange amount of the outdoor heat exchanger is greater than the required heat exchange amount when the operating frequency of the compressor is decreased to a set value Hmin and the rotation speed of the outdoor fan is decreased to Fmin, and when the air conditioner device is in a cooling operation state and the discharge pressure Pd of the compressor is less than a target pressure Pdo, or when the air conditioner device is in a heating operation state and the discharge pressure Pd of the compressor is greater than a target pressure Pdo.

4. The air conditioning apparatus as claimed in claim 1, wherein the two outdoor heat exchangers share an outdoor fan, the two outdoor heat exchangers have a movable/telescopic baffle therebetween, and the control module is configured to control the movable/telescopic baffle to move/extend between the two outdoor heat exchangers so as to control an area of the outdoor heat exchanger through which an air flow generated by the outdoor fan flows.

5. The air conditioning device according to claim 1, wherein the outdoor heat exchangers are separated by a partition, each outdoor heat exchanger is provided with an outdoor fan, and the control module is used for controlling the stop of at least one outdoor fan.

6. The air conditioning apparatus according to claim 1, wherein the control module has at least three schemes with different heat exchange capacities according to the number of the outdoor heat exchangers through which the air flow generated by the outdoor fan passes, and the control module is configured to select the scheme in which the heat exchange amount of the outdoor heat exchanger is closest to the required heat exchange amount.

7. The air conditioning apparatus of claim 6, wherein the control module is configured to select a scheme in which the compressor actual discharge pressure is near a target pressure Pdo and not greater than a target pressure Pdo during cooling conditions; the control module is used for selecting a scheme that the actual exhaust pressure of the compressor is close to the target pressure Pdo and not less than the target pressure Pdo under the heating condition.

8. The air conditioner as claimed in claim 6, wherein the air conditioner comprises at least two outdoor units, at least one outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branches connected in parallel, the outdoor branches comprise a throttling device and an outdoor heat exchanger; the control module is used for selecting a scheme that the actual exhaust pressure of the compressor is close to the target pressure Pdo and not greater than the target pressure Pdo when the refrigerating condition is met, the operating frequency of at least one compressor is reduced to a set value Hmin, and the rotating speed of an outdoor fan of at least one outdoor unit is reduced to Fmin; the control module is used for selecting a scheme that the actual exhaust pressure of the compressor is close to the target pressure Pdo and not less than the target pressure Pdo when the heating condition is met, the operating frequency of at least one compressor is reduced to a set value Hmin, and the rotating speed of an outdoor fan of at least one outdoor unit is reduced to Fmin.

9. The air conditioning apparatus according to claim 1, wherein the control module controls the outdoor heat exchanger not requiring air-cooling heat dissipation to be isolated from the outdoor fan or controls an outdoor fan of the outdoor heat exchanger not requiring air-cooling heat dissipation to be stopped when the outdoor heat exchanger requires air-cooling heat dissipation.

10. The air conditioning device as claimed in any one of claims 1 to 9, wherein the control module is configured to control the opening degree of the throttling device corresponding to the outdoor heat exchanger which does not pass through the airflow to be smaller than a set value.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner.

Background

In order to enhance the capacity of the unit, the matching form of the outdoor fan and the outdoor heat exchanger of the existing large-capacity air conditioning unit generally adopts the following three structural forms: FIG. 1a, two outdoor heat exchangers, two throttling devices, and an outdoor fan; FIG. 1b, two outdoor heat exchangers, two throttling devices, two outdoor fans; fig. 1c, integrated long pipeline outdoor heat exchanger, a throttling device, an outdoor fan. If the single module unit can not meet the capacity required by the project, a multi-module combination form is adopted.

The cycle process will be described by taking a heating process (fig. 1 b) of a double heat exchanger and double fan structure as an example, the flow direction of the refrigerant is shown by an arrow in the figure, the solid line shows the cooling flow direction, and the dotted line shows the heating flow direction. The main process is as follows: 1) the compressor 2 sucks the low-pressure low-temperature gaseous refrigerant from the gas-liquid separator 1, compresses the refrigerant to a high-pressure high-temperature superheated state, and discharges the refrigerant into the indoor heat exchanger 10; 2) the liquid state which is cooled, condensed and supercooled to high pressure and supercooled in the indoor heat exchanger 10 after exchanging heat with indoor air is discharged into an outdoor unit through an indoor throttling device 9; 3) the supercooled liquid refrigerant is divided into two paths, throttled and depressurized to a low-pressure two-phase state by a first throttling device 5 a/a second throttling device 5b, and then enters a first outdoor heat exchanger 4 a/a second outdoor heat exchanger 4 b; 4) the low-pressure liquid refrigerant is evaporated and absorbs heat in the first outdoor heat exchanger 4 a/the second outdoor heat exchanger 4b, is heated to a low-pressure superheated gas state, is converged and then enters the gas-liquid separator 1; 5) the gas-liquid separator 1 separates gas-phase refrigerant from liquid-phase refrigerant, and the compressor 2 sucks the gas-phase refrigerant from the gas-liquid separator 1 to perform the next cycle. It should be noted that, in the prior art, as shown in fig. 1a and 1b, the areas of the two outdoor heat exchangers are identical, so to simplify the complexity of the control, the control of the first throttling device 5 a/the second throttling device 5b is identical, and the control of the first outdoor fan 11 a/the second outdoor fan 11b is identical.

Under the above prior art scheme, there are the following problems: 1) under the working conditions of refrigeration, indoor low-load working condition or low-temperature refrigeration and the like, the high pressure of the system is lower due to the large area and strong heat exchange capacity of the outdoor heat exchanger, and the problems exist: the low-temperature heating system has the advantages that firstly, the high-low pressure ratio of the system is low, the reliability of a compressor driving device is influenced, secondly, the operation working condition of the unit is bad, the efficiency of the compressor is low, the power consumption is high, the energy is not saved, and in addition, the problems that the evaporation pressure of an indoor unit is low, the compressor is frequently started and stopped for preventing the unit from freezing and the comfort level of a user is not good can be caused under the low-temperature heating working condition; 2) under the working conditions of heating, indoor low-load working conditions or high-temperature heating and the like, because the area of the outdoor heat exchanger is large and the heat exchange capacity is very strong, the low pressure is high, and the problems exist: firstly, the condensing pressure of the indoor unit is high, the unit cannot operate and the use of a user is influenced due to the fact that the condensing pressure of the indoor unit exceeds the pressure operation range of the compressor, and secondly, the unit has bad operation condition, low efficiency of the compressor, high power consumption and is not beneficial to energy conservation; 3) when the multi-module combined operation, because outdoor heat exchanger heat transfer ability can not effectively reduce, when outdoor heat exchanger does the condenser and provides unnecessary heat transfer ability, the problem exists: the high-low pressure ratio of the system is low, the reliability of a compressor driving device is influenced, the evaporating pressure of an indoor unit is low, the compressor is frequently started and stopped for preventing the unit from freezing, and the comfort of a user is poor, and the unit is severe in operation condition, low in efficiency of the compressor, high in power consumption and not beneficial to energy conservation; when the outdoor heat exchanger is used as an evaporator to provide redundant heat exchange capacity, the problems exist: firstly, the condensation pressure of the indoor unit is high, the unit cannot operate and the use of a user is influenced due to the fact that the condensation pressure of the indoor unit exceeds the pressure operation range of the compressor, and secondly, the unit has bad operation condition, low efficiency of the compressor, high power consumption and is not beneficial to energy conservation.

To sum up, above the problem can lead to compressor frequent start-stop, compressor life-span and reliability scheduling problem, and some scenes lead to the air conditioner even can not work, and the operating condition scope of restriction air conditioner influences the user and uses the travelling comfort, easily causes user complaint to unit operating condition is abominable, compressor inefficiency, power consumptive quantity height, be unfavorable for energy-conservation.

Disclosure of Invention

The invention provides an air conditioning device, which solves the technical problems of frequent start and stop of a compressor, incapability of working, low efficiency and high power consumption caused by overlarge heat exchange quantity of an outdoor heat exchanger in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

an air conditioning device comprises an outdoor unit, wherein the outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branches connected in parallel, and the outdoor branches comprise a throttling device and an outdoor heat exchanger;

the air conditioning apparatus further includes:

and the control module is used for controlling the heat exchange area of the outdoor heat exchanger for carrying out heat exchange with the airflow generated by the outdoor fan to be reduced when the heat exchange amount of the outdoor heat exchanger is greater than the required heat exchange amount.

Compared with the prior art, the technical scheme of the invention has the following technical effects: when the heat exchange amount of the outdoor heat exchanger is larger than the required heat exchange amount, the air conditioning device controls the heat exchange area of the outdoor heat exchanger for carrying out heat exchange with the airflow generated by the outdoor fan to be reduced, so that the heat exchange capacity of the outdoor heat exchanger is reduced, the running stability of the compressor is ensured, the efficiency of the compressor is improved, and the power consumption is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIGS. 1a-1c are schematic diagrams of a prior art air conditioning system.

Fig. 2 is a schematic diagram of an air conditioning system according to an embodiment of the invention.

Fig. 3 is a schematic diagram of an air conditioning system according to a second embodiment of the present invention.

Fig. 4 is a schematic diagram of a three-air conditioner system according to an embodiment of the present invention.

Reference numbers in the figures:

1: a gas-liquid separator 2: the compressor 3: four-way selector valve 4 a: first outdoor heat exchanger 4 b: second outdoor heat exchanger 5 a: first throttle device 5 b: the second throttling device 6: a separator 7: gas-side stop valve 8: liquid side stop valve 9: indoor throttling device 10: indoor heat exchanger 11 a: first outdoor fan 11 b: the second outdoor fan 12: movable/retractable barrier 100-1, 100-2, 100-3, 100-N: indoor units 200-1, 200-2: an outdoor unit.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

Aiming at the defects existing in the prior art, the air conditioning device needs to adopt a certain technical scheme to reduce the heat exchange capacity of the outdoor heat exchanger under certain working conditions. From the principle of heat transfer, Q = K A Δ T (Q: heat exchange quantity of the heat exchanger, K: heat transfer coefficient, A: heat transfer area of the heat exchanger, and Δ T: heat exchange temperature difference between refrigerant in the pipe and air), and the heat exchange quantity of the heat exchanger is related to the heat transfer coefficient, the heat transfer area of the heat exchanger, and the heat exchange temperature difference between the refrigerant in the pipe and the air. When the outdoor temperature and the air conditioner operation control mode are set, the delta T is determined to be certain, and the heat exchange quantity of the heat exchanger can be regulated and controlled from the following aspects: 1) the rotating speed of the outdoor fan is reduced, the air flow rate is reduced, and the K is reduced, so that the heat exchange quantity of the heat exchanger is reduced; 2) the circulation of the refrigerant is reduced, the flow speed of the refrigerant in the pipe is reduced, and K is reduced, so that the heat exchange quantity of the heat exchanger is reduced; 3) the heat exchanger is partitioned, so that the heat exchange area participating in heat exchange is reduced, and A is reduced, and the heat exchange quantity of the heat exchanger is reduced. The third implementation principle is used in the embodiment, and the heat exchange capacity of the outdoor heat exchanger is reduced by controlling the heat exchange area of the outdoor heat exchanger participating in the work, so that the problems mentioned above are solved.

Example 1

The air conditioning device comprises an outdoor unit, wherein the outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branch circuits connected in parallel, and each outdoor branch circuit comprises a throttling device and an outdoor heat exchanger.

The present embodiment is described by taking an example in which the air conditioner includes two outdoor branches, each of which includes a throttling device and an outdoor heat exchanger connected in series. Wherein, two outdoor heat exchangers share an outdoor fan.

As shown in fig. 2, the refrigerant circulation flow process is described by taking the refrigeration condition as an example: 1) the compressor 2 sucks the low-pressure gaseous refrigerant from the gas-liquid separator 1 and compresses the low-pressure gaseous refrigerant into high-temperature high-pressure gas which is discharged into the outdoor heat exchanger; 2) the air is subjected to heat exchange cooling, condensation and supercooling in the first outdoor heat exchanger 4a to a high-pressure supercooling liquid state and then enters the first throttling device 5a, and the air is subjected to heat exchange cooling, condensation and supercooling in the second outdoor heat exchanger 4b to a high-pressure supercooling liquid state and then enters the second throttling device 5 b; 3) the air enters an indoor throttling device 9 after passing through a first throttling device 5a, a second throttling device 5b and a liquid side stop valve 8, is throttled and depressurized to a low-pressure two-phase state, and then enters an indoor heat exchanger 10; 4) the heat is evaporated and absorbed in the indoor heat exchanger 10 to be in a low-pressure overheat state and then enters the gas-liquid separator 1 through the gas-side stop valve 7; 5) gas-liquid phase separation is performed in the gas-liquid separator 1, and a gas-phase refrigerant is sucked by the compressor 2, thereby completing the next cycle.

The control module is used for controlling the heat exchange area of the outdoor heat exchanger for heat exchange with the air flow generated by the outdoor fan to be reduced when the heat exchange amount of the outdoor heat exchanger is larger than the required heat exchange amount.

The control module is used for obtaining the exhaust pressure Pd of the compressor and determining whether the heat exchange quantity of the outdoor heat exchanger is larger than the required heat exchange quantity or not according to the exhaust pressure Pd of the compressor.

Specifically, the control module is configured to obtain an operating frequency of the compressor, a rotation speed of the outdoor fan, and an operating mode of the air conditioning device, and is configured to determine that a heat exchange amount of the outdoor heat exchanger is greater than a required heat exchange amount when the operating frequency of the compressor is reduced to a set value Hmin and the rotation speed of the outdoor fan is reduced to Fmin, and when the air conditioning device is in a cooling condition and an exhaust pressure Pd of the compressor is less than a target pressure Pdo, or when the air conditioning device is in a heating condition and the exhaust pressure Pd of the compressor is greater than a target pressure Pdo.

In the present embodiment, a movable/telescopic baffle 12 is provided between the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4 b.

The control module is used for controlling the movable/telescopic baffle 12 to move/extend between the two outdoor heat exchangers so as to control the area of the outdoor heat exchanger through which the airflow generated by the outdoor fan flows.

In a normal condition, that is, when the heat exchange amount of the outdoor heat exchanger is less than or equal to the required heat exchange amount, the retractable shutter 12 is retracted, or the movable shutter 12 is moved out, the shutter 12 is not between the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4b, and the airflow generated by the outdoor fan 11a flows through the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4 b.

When the heat exchange amount of the outdoor heat exchanger needs to be reduced, namely when the heat exchange amount of the outdoor heat exchanger is larger than the required heat exchange amount, the telescopic baffle plate 12 is stretched, or the movable baffle plate 12 is moved in, and the baffle plate 12 is arranged between the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4b, so that one of the outdoor heat exchangers is completely or partially isolated from the outdoor fan 11 a.

The present invention does not limit the form of the outdoor heat exchanger, the relative positions of the two outdoor heat exchangers, and the movable/telescopic baffle 12 is provided according to the form of the outdoor heat exchanger and the position of the outdoor fan.

The present invention is not limited to top-outlet air conditioners and side-outlet air conditioners.

The present embodiment achieves complete isolation of one of the outdoor heat exchangers of the outdoor unit from the outdoor fan 11a by the retractable barrier 12.

When the air conditioning device is in a refrigeration working condition, the outdoor heat exchangers are used as condensers, when the fact that the operating frequency H of the compressor is reduced to the minimum value Hmin and the rotating speed of the outdoor fan 11a is reduced to the minimum value Fmin is detected, the exhaust pressure Pd of the compressor at the moment is smaller than the target pressure Pdo, the telescopic baffle is started to shield one of the outdoor heat exchangers, the opening degree of the corresponding outdoor throttling device is smaller than a set value, and the outdoor throttling device is kept at a small opening degree.

When the air conditioner is in a heating condition, the outdoor heat exchangers are used as evaporators, when the operating frequency H of the compressor is detected to be reduced to the minimum value Hmin, the rotating speed of the outdoor fan 11a is detected to be reduced to the minimum value Fmin, the exhaust pressure Pd of the compressor at the moment is greater than the target pressure Pdo, the telescopic baffle is started to shield one of the outdoor heat exchangers, the corresponding outdoor throttling device is smaller than a set value, and the outdoor throttling device is kept at a small opening degree.

Wherein, 1) the minimum value Hmin of the frequency is restricted by the frequency operation ranges of different compressors; 2) the minimum value Fmin of the fan rotation speed is not necessarily 0, for example, some air conditioners use air cooling to drive the base plate to dissipate heat, and the fan is required to maintain a certain rotation speed in order to ensure that the temperature of the heat dissipation fins is within an allowable range; 3) if the situations such as air cooling and heat dissipation are not involved, generally speaking, the first outdoor heat exchanger or the second outdoor heat exchanger can be optionally subjected to fan isolation; if the area shielded by the telescopic baffle comprises air cooling heat dissipation, the area shielded by the telescopic baffle on the other side of the heat exchanger is adopted for regulation and control; 4) the opening degree of the throttling device corresponding to the heat exchanger shielded by the telescopic baffle is kept at a smaller opening degree, and the throttling device mainly has the main function of keeping the refrigerant circulation by keeping the smaller opening degree, so that the shielded heat exchanger is prevented from accumulating oil and affecting the lubrication reliability of the compressor.

In the embodiment, one of the outdoor heat exchangers of the outdoor unit is completely isolated from the outdoor fan through the telescopic baffle plate, when the system controls and detects Pd and judges that the capacity of the outdoor heat exchanger is overlarge, the corresponding throttling device is blocked, one of the outdoor heat exchangers is controlled to be closed, and the heat exchange amount of the outdoor heat exchanger of the system is basically not reduced by half of that of the prior art, so that the problem caused by overlarge heat exchange amount of the outdoor heat exchanger in some application scenes in the prior art is solved.

1) Under the working conditions of refrigeration, indoor low-load working condition or low-temperature refrigeration and the like, the high pressure of the system is improved by effectively reducing the heat exchanger of the outdoor heat exchanger, the high-low pressure ratio of the system is improved, the reliability of the compressor driving equipment is improved, the running working condition of the unit is improved, the efficiency of the compressor is improved, and the energy conservation is facilitated; and evaporation pressure can be improved under the low-temperature refrigeration working condition, the problem that the compressor is frequently started and stopped for preventing freezing of the unit is solved, and the comfort level of a user is improved.

2) This embodiment promotes the evaporating pressure through the heat exchanger that effectively reduces outdoor heat exchanger in the working condition such as heating and indoor low-load operating mode or high temperature heating, reduces indoor set condensing pressure, enlarges the environmental condition of unit operation, improves the satisfaction of user to the product, improves unit operating condition, promotes compressor efficiency, is favorable to energy-conservation.

Of course, the control module can also adjust the position of the baffle plate so as to adjust the heat exchange area of the outdoor heat exchanger for carrying out heat exchange with the airflow generated by the outdoor fan, so that the heat exchange quantity of the outdoor heat exchanger is close to the required heat exchange quantity.

Example 2

The air conditioning device comprises an outdoor unit, wherein the outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branch circuits connected in parallel, and each outdoor branch circuit comprises a throttling device and an outdoor heat exchanger.

The present embodiment is described by taking an example in which the air conditioner includes two outdoor branches, each of which includes a throttling device and an outdoor heat exchanger connected in series. Wherein, each outdoor heat exchanger is provided with an outdoor fan.

As shown in fig. 3, the refrigerant circulation flow process is described by taking the refrigeration condition as an example: 1) the compressor 2 sucks the low-pressure gaseous refrigerant from the gas-liquid separator 1 and compresses the low-pressure gaseous refrigerant into high-temperature high-pressure gas which is discharged into the outdoor heat exchanger; 2) the air and the air are subjected to heat exchange cooling, condensation and supercooling in the first outdoor heat exchanger 4 a/the second outdoor heat exchanger 4b to high-pressure supercooling liquid state, and then the liquid enters the first throttling device 5 a/the second throttling device 5 b; 3) the air enters an indoor throttling device 9 after passing through a throttling device and a liquid side stop valve 8, is throttled and depressurized to a low-pressure two-phase state, and then enters an indoor heat exchanger 10; 4) the heat is evaporated and absorbed in the indoor heat exchanger 10 to be in a low-pressure overheat state, and then enters the gas-liquid separator 1 through the gas-side stop valve 7; 5) gas-liquid phase separation is performed in the gas-liquid separator 1, and a gas-phase refrigerant is sucked by the compressor 2, thereby completing the next cycle.

The control module is used for controlling the heat exchange area of the outdoor heat exchanger for heat exchange with the air flow generated by the outdoor fan to be reduced when the heat exchange amount of the outdoor heat exchanger is larger than the required heat exchange amount.

The control module is used for obtaining the exhaust pressure Pd of the compressor and determining whether the heat exchange quantity of the outdoor heat exchanger is larger than the required heat exchange quantity or not according to the exhaust pressure Pd of the compressor.

Specifically, the control module is configured to obtain an operating frequency of the compressor, a rotation speed of the outdoor fan, and an operating mode of the air conditioning device, and is configured to determine that a heat exchange amount of the outdoor heat exchanger is greater than a required heat exchange amount when the operating frequency of the compressor is reduced to a set value Hmin and the rotation speed of the outdoor fan is reduced to Fmin, and when the air conditioning device is in a cooling condition and an exhaust pressure Pd of the compressor is less than a target pressure Pdo, or when the air conditioning device is in a heating condition and the exhaust pressure Pd of the compressor is greater than a target pressure Pdo.

In this embodiment, the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4b are separated by a partition plate 6, each outdoor heat exchanger is respectively provided with an outdoor fan, and the control module is used for controlling at least one outdoor fan to stop. The first outdoor heat exchanger 4a is provided with a first outdoor fan 11a, and the second outdoor heat exchanger 4b is provided with a second outdoor fan 11 b.

In the present embodiment, the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4b are separated by the partition plate 6, that is, the wind field of the first outdoor heat exchanger 4a and the wind field of the second outdoor heat exchanger 4b are completely separated. The air volume for heat exchange with the first outdoor heat exchanger 4a comes only from the suction action of the first outdoor fan 11a, and the air volume for heat exchange with the second outdoor heat exchanger 4b comes only from the suction action of the second outdoor fan 11 b.

The form of the outdoor heat exchanger and the relative positions of the two outdoor heat exchangers are not limited in the present invention, and the partition plate 6 is provided according to the form of the outdoor heat exchanger and the position of the outdoor fan.

The present invention is not limited to top-outlet air conditioners and side-outlet air conditioners.

In this embodiment, the first outdoor heat exchanger 4 a/the second outdoor heat exchanger 4b are partitioned by the partition plate 6, so that the heat exchange capacities of the two heat exchangers are completely independent, that is, the first outdoor heat exchanger 4a, the first outdoor fan 11a and the first throttling device 5a form an independent unit to control the heat exchange capacity of the first outdoor heat exchanger 4a, and the second outdoor heat exchanger 4b, the second outdoor fan 11b and the second throttling device 5b form an independent unit to control the heat exchange capacity of the second outdoor heat exchanger 4 b.

When the air conditioning device is in a refrigeration working condition: and when the outdoor heat exchanger is used as a condenser, and the running frequency H of the compressor is detected to be reduced to the minimum value Hmin, the rotating speeds of the two outdoor fans are reduced to the minimum value Fmin, and the exhaust pressure Pd of the compressor at the moment is less than the target pressure Pdo, one of the outdoor fans is closed, the opening degree of the corresponding outdoor throttling device is less than a set value, and the outdoor throttling device is kept at a smaller opening degree.

When the air conditioner is in a heating condition, the outdoor heat exchanger is used as an evaporator, when the operating frequency H of the compressor is detected to be reduced to the minimum value Hmin, the rotating speeds of the two outdoor fans are detected to be reduced to the minimum value Fmin, the exhaust pressure Pd of the compressor at the moment is greater than the target pressure Pdo, one of the outdoor fans is closed, the opening degree of the corresponding outdoor throttling device is smaller than a set value, and the outdoor throttling device is kept at a smaller opening degree.

Wherein, 1) the minimum value Hmin of the frequency is restricted by the frequency operation ranges of different compressors; 2) the minimum value Fmin of the fan rotation speed is not necessarily 0, for example, some air conditioners use air cooling to drive the base plate to dissipate heat, and the fan is required to maintain a certain rotation speed in order to ensure that the temperature of the heat dissipation fins is within an allowable range; 3) if the situations such as air cooling and heat dissipation are not involved, generally speaking, the first outdoor fan or the second outdoor fan can be selected to be switched off, and if a specific one of the fans is mainly responsible for air cooling and heat dissipation, the other fan needs to be switched off; 4) the opening degree of the throttling device corresponding to the closed outdoor fan is kept at a smaller opening degree, and the main function is to keep the refrigerant flowing through the smaller opening degree, so that the phenomenon that the lubricating reliability of the compressor is influenced due to the fact that oil is accumulated in the heat exchanger corresponding to the closed fan is prevented.

In the embodiment, the air field partitions of the two heat exchangers and the throttling devices are adjusted independently through the partition plates, when the system controls and detects Pd and judges that the capacity of the outdoor heat exchanger is overlarge, one of the fans is closed, the corresponding throttling device is closed, one of the heat exchangers is controlled to have no heat exchange quantity basically, the heat exchange quantity of the outdoor heat exchanger of the system is reduced by half of that of the prior art, and therefore the problem caused by overlarge heat exchange quantity of the outdoor heat exchanger in some application scenes in the prior art is solved.

1) Under the working conditions of refrigeration, indoor low-load working condition or low-temperature refrigeration and the like, the high pressure of the system is improved by effectively reducing the heat exchanger of the outdoor heat exchanger, the high-low pressure ratio of the system is improved, the reliability of the compressor driving equipment is improved, the running working condition of the unit is improved, the efficiency of the compressor is improved, and the energy conservation is facilitated; and evaporation pressure can be improved under the low-temperature refrigeration working condition, the problem that the compressor is frequently started and stopped for preventing freezing of the unit is solved, and the comfort level of a user is improved.

2) This embodiment promotes the evaporating pressure through the heat exchanger that effectively reduces outdoor heat exchanger in the working condition such as heating and indoor low-load operating mode or high temperature heating, reduces indoor set condensing pressure, enlarges the environmental condition of unit operation, improves the satisfaction of user to the product, improves unit operating condition, promotes compressor efficiency, is favorable to energy-conservation.

Example 3

The air conditioning device comprises at least two outdoor units, at least one outdoor unit comprises a compressor, an outdoor fan and at least two outdoor branches connected in parallel, and each outdoor branch comprises a throttling device and an outdoor heat exchanger.

The control module has at least three schemes with different heat exchange capacities according to the number of the air flows generated by the outdoor fan and flowing through the outdoor heat exchanger, and the control module is used for selecting the scheme that the heat exchange quantity of the outdoor heat exchanger is closest to the required heat exchange quantity.

Specifically, the control module is used for selecting a scheme that the actual discharge pressure of the compressor is close to the target pressure Pdo and not greater than the target pressure Pdo under the refrigeration working condition; the control module is used to select a scheme where the compressor actual discharge pressure is near the target pressure Pdo and is not less than the target pressure Pdo at the heating conditions.

Further, the control module is used for selecting a scheme that the actual exhaust pressure of the compressor is close to the target pressure Pdo and not greater than the target pressure Pdo when the refrigerating condition is met, the operating frequency of at least one compressor is reduced to a set value Hmin, and the rotating speed of an outdoor fan of at least one outdoor unit is reduced to Fmin; the control module is used for selecting a scheme that the actual exhaust pressure of the compressor is close to the target pressure Pdo and not less than the target pressure Pdo when the operating frequency of the at least one compressor is reduced to a set value Hmin and the rotating speed of an outdoor fan of the at least one outdoor unit is reduced to Fmin under the heating condition.

The present embodiment will be described by taking an example in which the air conditioner includes two outdoor units 200-1 and 200-2. The outdoor unit 200-1 includes two outdoor branches, each outdoor branch includes a throttling device and an outdoor heat exchanger connected in series, each outdoor heat exchanger is provided with an outdoor fan, and the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4b are separated by a partition plate 6. The outdoor unit 200-2 includes two outdoor branches, each of which includes a throttling device and an outdoor heat exchanger connected in series, the two outdoor heat exchangers share an outdoor fan, and a movable/telescopic baffle 12 is disposed between the first outdoor heat exchanger 4a and the second outdoor heat exchanger 4 b.

This embodiment illustrates application scenarios and effects in module assembly.

As shown in fig. 4, the outdoor unit 200-1 and the outdoor unit 200-2 are combined with N indoor units.

The first outdoor heat exchanger/the second outdoor heat exchanger of the outdoor unit 200-1 are respectively abbreviated as a/B, and the first outdoor heat exchanger/the second outdoor heat exchanger of the outdoor unit 200-2 are respectively abbreviated as C/D. The first outdoor heat exchanger and the second outdoor heat exchanger may be the same or different, and are not limited. For convenience of describing the implementation effect of this embodiment, taking the example that the heat exchange capacities of the first outdoor unit heat exchanger and the second outdoor unit heat exchanger are different, under the same test condition, the heat exchange capacities of the outdoor heat exchangers are as follows: (A + B) > (C + D) > A/B > C/D.

When the control module detects that the heat exchange amount of the outdoor unit heat exchangers is excessive (at this time, the four outdoor heat exchangers A, B, C and D provide heat exchange capacity, the frequency of the compressor of the first outdoor unit/the second outdoor unit is already the minimum value Hmin, and the rotating speed of the fan of the first outdoor unit/the second outdoor unit is reduced to the minimum value Fmin), the following regulation and control schemes of the heat exchanger capacity can be adopted in sequence. In the refrigeration working condition, the target exhaust pressure Pdo is taken as a target value, and a scheme that the actual exhaust pressure is closest to Pdo and not greater than Pdo is selected; in the heating condition, the target exhaust pressure Pdo is used as a target value, and the scheme that the actual exhaust pressure is closest to Pdo and not less than Pdo is selected.

Scheme number	Heat exchanger capable of exerting capacity
		1	A&B&(C/D)
2	(A/B)&C&D
		3	A&B
4	C&D
		5	A/B
6	C/D

Remarking: "/" denotes "or", "&" denotes "and"

Wherein, 1) the heat exchange capacity of the heat exchanger is reduced in sequence according to the sequence number in the table; 2) the minimum value Hmin of the frequency is constrained by the frequency operation ranges of different compressors; 3) the minimum value Fmin of the fan rotation speed is not necessarily 0, for example, some air conditioners use air cooling to drive the base plate to dissipate heat, and the fan is required to maintain a certain rotation speed in order to ensure that the temperature of the heat dissipation fins is within an allowable range; 4) if the air-cooling heat dissipation is not involved, generally, the dual-fan outdoor unit 200-1 system may optionally have the first outdoor fan or the second outdoor fan to perform the shutdown operation, and if one of the outdoor fans is mainly responsible for the air-cooling heat dissipation, the other outdoor fan needs to be shut down; the single-fan outdoor unit 200-2 system can optionally select a first outdoor heat exchanger or a second outdoor heat exchanger for outdoor fan isolation; if the area shielded by the telescopic baffle comprises air cooling heat dissipation, the area shielded by the telescopic baffle on the other side of the heat exchanger is adopted for regulation and control; 5) the opening degree of the throttling element corresponding to the heat exchanger with limited heat exchange capacity is kept at a smaller opening degree, and the throttling element mainly has the main function of keeping the circulation of a refrigerant by maintaining the smaller opening degree, so that the phenomenon that the lubricating reliability of the compressor is influenced by the oil accumulated in the heat exchanger corresponding to the closed fan is prevented.

The double-fan system of the embodiment realizes the air field partition of the two heat exchangers through the partition plate, the throttling element is adjusted independently, the single-fan system realizes the complete isolation of one heat exchanger and the fan of the outdoor unit through the telescopic baffle plate, when the system controls and detects Pd and judges that the capacity of the outdoor heat exchanger is overlarge, the regulation and control scheme of the 6 heat exchanger capacities in the upper table can be adopted, the heat exchange capacity of the outdoor heat exchanger is regulated and controlled according to indoor load, the system performance is improved, the operation working condition range of a unit is expanded, the operation reliability of a compressor is improved, the user comfort is improved, and the energy conservation is facilitated.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.