阅读说明：本技术 一种空调机 (Air conditioner ) 是由 吴红霞 李新海 刘忠民 于 2021-01-18 设计创作，主要内容包括：本发明公开一种空调机,其包括制冷循环系统、储液装置及控制器,储液装置具有第一冷媒出口,且通过第一冷媒充注管连接至制冷循环系统,第一冷媒充注管上设有第一开关阀；控制器用于：在制冷模式下,获取压缩机的实际排气温度值；将获取到的制冷循环系统的运行参数值代入预置的第一关系式中,计算得到压缩机的理论排气温度值；根据压缩机的实际排气温度值与理论排气温度值的比较结果,判断制冷循环系统的冷媒充注量是否低于第一阈值；当制冷循环系统的冷媒充注量低于第一阈值时,则打开第一开关阀,使储液罐内的冷媒流入制冷循环系统中。本发明的空调机能够实时判断制冷循环系统是否存在冷媒量不足,并能够自动充注冷媒。(The invention discloses an air conditioner, which comprises a refrigeration cycle system, a liquid storage device and a controller, wherein the liquid storage device is provided with a first refrigerant outlet and is connected to the refrigeration cycle system through a first refrigerant filling pipe; the controller is used for: acquiring an actual exhaust temperature value of the compressor in a refrigeration mode; substituting the obtained operation parameter value of the refrigeration cycle system into a preset first relational expression to calculate and obtain a theoretical exhaust temperature value of the compressor; judging whether the refrigerant charge amount of the refrigeration cycle system is lower than a first threshold value according to a comparison result of the actual exhaust temperature value and the theoretical exhaust temperature value of the compressor; when the refrigerant charge amount of the refrigeration cycle system is lower than a first threshold value, the first switch valve is opened, so that the refrigerant in the liquid storage tank flows into the refrigeration cycle system. The air conditioner can judge whether the refrigerating cycle system has insufficient refrigerant quantity in real time and can automatically fill the refrigerant.)

1. An air conditioner, characterized by comprising:

the refrigeration cycle system comprises a compressor, a throttling device, an indoor heat exchanger and an outdoor heat exchanger which are connected through a refrigerant pipeline;

the liquid storage device is internally stored with a refrigerant and is provided with a first refrigerant outlet, and the first refrigerant outlet is connected to a refrigerant pipeline connecting the throttling device and the indoor heat exchanger through a first refrigerant filling pipe;

the first switch valve is arranged on the first refrigerant filling pipe; and

a controller in electrical connection with the first switching valve, the controller configured to:

acquiring a first actual exhaust temperature value of a compressor in a refrigeration mode of an air conditioner;

substituting the obtained operation parameter value of the refrigeration cycle system into a preset first relational expression to calculate a first theoretical exhaust temperature value of the compressor; the first relational expression records the relation between the exhaust temperature value of the compressor and the operation parameter value of the refrigeration cycle system in the refrigeration mode; the operation parameter values of the refrigeration cycle system comprise an operation frequency value of the compressor, an air inlet temperature value of the outdoor heat exchanger, a middle coil temperature value of the outdoor heat exchanger, an air inlet temperature value of the indoor heat exchanger and a middle coil temperature value of the indoor heat exchanger;

judging whether the refrigerant charge quantity of the refrigeration cycle system is lower than a first threshold value or not according to a comparison result of a first actual exhaust temperature value of the compressor and a first theoretical exhaust temperature value of the compressor;

and when the refrigerant charge amount of the refrigeration cycle system is lower than a first threshold value, opening the first switch valve to enable the refrigerant in the liquid storage tank to flow into the refrigeration cycle system.

2. An air conditioner according to claim 1, wherein the first relational expression is: t is_dt＝a₀+a₁·F+a₂·T1+a₃·T2+a₄·T3+a₅·T4；

Wherein, a₀、a₁、a₂、a₃、a₄、a₅Are weight coefficients and are all constants; t is_dtIs the first theoretical exhaust temperature value of the compressor, F is the running frequency value of the compressor, T1 is the inlet air temperature value of the outdoor heat exchanger, T2 is the middle coil temperature value of the outdoor heat exchanger, T3 is the indoor temperature valueThe air inlet temperature value of the heat exchanger is T4 which is the temperature value of the middle coil of the indoor heat exchanger.

3. The air conditioner according to claim 1, wherein the air conditioner is further configured to:

according to the formula ∈ ═ T_dr-T_dt)/T_dtCalculating a first deviation ratio; where ε is the first deviation ratio, T_drIs a first actual discharge temperature value, T, of the compressor_dtIs a first theoretical discharge temperature value for the compressor;

and when the first deviation ratio is greater than or equal to a first preset value, indicating that the refrigerant charge amount in the refrigeration cycle system is lower than a first threshold value.

4. The air conditioner according to claim 1, wherein the controller is further configured to:

and when the opening time of the first switch valve reaches a first preset time, closing the first switch valve.

5. An air conditioner, characterized by comprising:

the refrigeration cycle system comprises a compressor, a throttling device, an indoor heat exchanger and an outdoor heat exchanger which are connected through a refrigerant pipeline;

the liquid storage device is internally stored with a refrigerant and is provided with a second refrigerant outlet, and the second refrigerant outlet is connected to the refrigerant pipeline of the throttling device and the outdoor heat exchanger through a first refrigerant filling pipe;

the second switch valve is arranged on the second refrigerant filling pipe; and

a controller electrically connected to the second switching valve, the controller configured to:

acquiring a second actual exhaust temperature value of the compressor in a heating mode of the air conditioner;

substituting the obtained operation parameter value of the refrigeration cycle system into a preset second relational expression to calculate a second theoretical exhaust temperature value of the compressor; the second relational expression records the relationship between the exhaust temperature value of the compressor and the operation parameter value of the refrigeration cycle system in the heating mode, and the operation parameter value of the refrigeration cycle system comprises the operation frequency value of the compressor, the inlet air temperature value of the outdoor heat exchanger, the middle coil temperature value of the outdoor heat exchanger, the inlet air temperature value of the indoor heat exchanger and the middle coil temperature value of the indoor heat exchanger;

judging whether the refrigerant charge quantity of the refrigeration cycle system is lower than a second threshold value according to a comparison result of a second actual exhaust temperature value of the compressor and a second theoretical exhaust temperature value of the compressor;

and when the refrigerant charge amount of the refrigeration cycle system is lower than a second threshold value, opening the second switch valve to enable the refrigerant in the liquid storage tank to flow into the refrigeration cycle system.

6. An air conditioner according to claim 5, wherein the second relational expression is: t is_dt′＝a₆+a₇·F+a₈·T1+a₉·T2+a₁₀·T3+a₁₁·T4；

Wherein, the a₆、a₇、a₈、a₉、a₁₀、a₁₁Are weight coefficients and are all constants; t is_dt' is the second theoretical exhaust temperature value of the compressor, F is the running frequency of the compressor, T1 is the intake air temperature value of the outdoor heat exchanger, T2 is the middle coil temperature value of the outdoor heat exchanger, T3 is the intake air temperature value of the indoor heat exchanger, and T4 is the middle coil temperature value of the indoor heat exchanger.

7. The air conditioner according to claim 5, wherein the controller is further configured to:

according to the formula ∈ ═ (T)_dr′-T_dt′)/T_dt', calculating a second deviation ratio; where ε' is the second deviation ratio, T_dr' is the second actual discharge temperature value, T, of the compressor_dt' is the second of the compressorA theoretical exhaust temperature value;

and when the second deviation ratio is greater than or equal to a second preset value, indicating that the refrigerant charge quantity of the refrigeration cycle system is lower than a second threshold value.

8. The air conditioner according to claim 5, wherein the controller is further configured to:

and when the opening time of the second switch valve reaches a second preset time, closing the second switch valve.

9. An air conditioner according to any one of claims 1 to 8, further comprising:

the first thermocouple is arranged at an air inlet of the outdoor heat exchanger and used for detecting the air inlet temperature of the outdoor heat exchanger;

the second thermocouple is arranged at the middle coil of the outdoor heat exchanger and used for detecting the temperature of the middle coil of the outdoor heat exchanger;

the third thermocouple is arranged at an air inlet of the indoor heat exchanger and used for detecting the air inlet temperature of the indoor heat exchanger;

the fourth thermocouple is arranged at the middle coil of the indoor heat exchanger and used for detecting the temperature of the middle coil of the indoor heat exchanger; and

the fifth thermocouple is arranged at the air outlet of the compressor and used for detecting the air exhaust temperature of the compressor;

the controller is further configured to:

and respectively acquiring an air inlet temperature value of the outdoor heat exchanger, a middle coil pipe temperature value of the outdoor heat exchanger, an air inlet temperature value of the indoor heat exchanger, a middle coil pipe temperature value of the indoor heat exchanger and an exhaust temperature value of the compressor through the first thermocouple, the second thermocouple, the third thermocouple, the fourth thermocouple and the fifth thermocouple.

Technical Field

The invention relates to the technical field of air conditioners, in particular to an air conditioner which can be used for solving the problem of insufficient refrigerant filling amount in a refrigeration cycle system.

Background

The air conditioner often appears the refrigerant condition of being insufficient after the live time of air conditioner has been over a long time to lead to the refrigeration or heating performance relatively poor, or the air conditioner has the extremely abominable operating mode that the laboratory can't predict when the product is developed, for example the required refrigerant volume of low temperature refrigeration is more and leads to the product to appear the problem of low temperature heating inadequately.

Disclosure of Invention

An object of the present application is to provide an air conditioner which can judge whether there is a situation that the refrigerant quantity is insufficient in a refrigeration cycle system in real time and can automatically fill the refrigerant.

The purpose of the application is realized by the following technical scheme:

an air conditioner, comprising:

the refrigeration cycle system comprises a compressor, a throttling device, an indoor heat exchanger and an outdoor heat exchanger which are connected through a refrigerant pipeline;

the liquid storage device is internally stored with a refrigerant and is provided with a first refrigerant outlet, and the first refrigerant outlet is connected to a refrigerant pipeline connecting the throttling device and the indoor heat exchanger through a first refrigerant filling pipe;

the first switch valve is arranged on the first refrigerant filling pipe; and

a controller in electrical connection with the first switching valve, the controller configured to:

acquiring a first actual exhaust temperature value of a compressor in a refrigeration mode of an air conditioner;

substituting the obtained operation parameter value of the refrigeration cycle system into a preset first relational expression to calculate a first theoretical exhaust temperature value of the compressor; the first relational expression records the relation between the exhaust temperature value of the compressor and the operation parameter value of the refrigeration cycle system in the refrigeration mode; the operation parameter values of the refrigeration cycle system comprise an operation frequency value of the compressor, an air inlet temperature value of the outdoor heat exchanger, a middle coil temperature value of the outdoor heat exchanger, an air inlet temperature value of the indoor heat exchanger and a middle coil temperature value of the indoor heat exchanger;

judging whether the refrigerant charge quantity of the refrigeration cycle system is lower than a first threshold value or not according to a comparison result of a first actual exhaust temperature value of the compressor and a first theoretical exhaust temperature value of the compressor;

and when the refrigerant charge amount of the refrigeration cycle system is lower than a first threshold value, opening the first switch valve to enable the refrigerant in the liquid storage tank to flow into the refrigeration cycle system.

In some embodiments of the present application, the first relation is: t is_dt＝a₀+a₁·F+a₂·T1+a₃·T2+a₄·T3+a₅·T4；

Wherein, a₀、a₁、a₂、a₃、a₄、a₅Are weight coefficients and are all constants; t is_dtThe temperature value is a first theoretical exhaust temperature value of the compressor, F is an operation frequency value of the compressor, T1 is an air inlet temperature value of the outdoor heat exchanger, T2 is a middle coil temperature value of the outdoor heat exchanger, T3 is an air inlet temperature value of the indoor heat exchanger, and T4 is a middle coil temperature value of the indoor heat exchanger.

In some embodiments of the present application, the air conditioner is further configured to:

according to the formula ∈ ═ T_dr-T_dt)/T_dtCalculating a first deviation ratio; where ε is the first deviation ratio, T_drIs a first actual discharge temperature value, T, of the compressor_dtIs a first theoretical discharge temperature value for the compressor;

and when the first deviation ratio is greater than or equal to a first preset value, indicating that the refrigerant charge amount in the refrigeration cycle system is lower than a first threshold value.

In some embodiments of the present application, the controller is further configured to:

and when the opening time of the first switch valve reaches a first preset time, closing the first switch valve.

An air conditioner, comprising:

the refrigeration cycle system comprises a compressor, a throttling device, an indoor heat exchanger and an outdoor heat exchanger which are connected through a refrigerant pipeline;

the liquid storage device is internally stored with a refrigerant and is provided with a second refrigerant outlet, and the second refrigerant outlet is connected to the refrigerant pipeline of the throttling device and the outdoor heat exchanger through a first refrigerant filling pipe;

the second switch valve is arranged on the second refrigerant filling pipe; and

a controller electrically connected to the second switching valve, the controller configured to:

acquiring a second actual exhaust temperature value of the compressor in a heating mode of the air conditioner;

substituting the obtained operation parameter value of the refrigeration cycle system into a preset second relational expression to calculate a second theoretical exhaust temperature value of the compressor; the second relational expression records the relationship between the exhaust temperature value of the compressor and the operation parameter value of the refrigeration cycle system in the heating mode, and the operation parameter value of the refrigeration cycle system comprises the operation frequency value of the compressor, the inlet air temperature value of the outdoor heat exchanger, the middle coil temperature value of the outdoor heat exchanger, the inlet air temperature value of the indoor heat exchanger and the middle coil temperature value of the indoor heat exchanger;

judging whether the refrigerant charge quantity of the refrigeration cycle system is lower than a second threshold value according to a comparison result of a second actual exhaust temperature value of the compressor and a second theoretical exhaust temperature value of the compressor;

and when the refrigerant charge amount of the refrigeration cycle system is lower than a second threshold value, opening the second switch valve to enable the refrigerant in the liquid storage tank to flow into the refrigeration cycle system.

In some embodiments of the present application, the second relation is: t is_dt′＝a₆+a₇·F+a₈·T1+a₉·T2+a₁₀·T3+a₁₁·T4；

Wherein, the a₆、a₇、a₈、a₉、a₁₀、a₁₁Are weight coefficients and are all constants; t is_dt' is the second theoretical exhaust temperature value of the compressor, F is the running frequency of the compressor, T1 is the intake air temperature value of the outdoor heat exchanger, T2 is the middle coil temperature value of the outdoor heat exchanger, T3 is the intake air temperature value of the indoor heat exchanger, and T4 is the middle coil temperature value of the indoor heat exchanger.

In some embodiments of the present application, the controller is further configured to:

according to the formula ∈ ═ (T)_dr′-T_dt′)/T_dt', calculating a second deviation ratio; where ε' is the second deviation ratio, T_dr' is the second actual discharge temperature value, T, of the compressor_dt' is a second theoretical discharge temperature value for the compressor;

and when the second deviation ratio is greater than or equal to a second preset value, indicating that the refrigerant charge quantity of the refrigeration cycle system is lower than a second threshold value.

In some embodiments of the present application, the controller is further configured to:

and when the opening time of the second switch valve reaches a second preset time, closing the second switch valve.

In some embodiments of the present application, the method further comprises:

the first thermocouple is arranged at an air inlet of the outdoor heat exchanger and used for detecting the air inlet temperature of the outdoor heat exchanger;

the second thermocouple is arranged at the middle coil of the outdoor heat exchanger and used for detecting the temperature of the middle coil of the outdoor heat exchanger;

the third thermocouple is arranged at an air inlet of the indoor heat exchanger and used for detecting the air inlet temperature of the indoor heat exchanger;

the fourth thermocouple is arranged at the middle coil of the indoor heat exchanger and used for detecting the temperature of the middle coil of the indoor heat exchanger; and

the fifth thermocouple is arranged at the air outlet of the compressor and used for detecting the air exhaust temperature of the compressor;

the controller is further configured to:

and respectively acquiring an air inlet temperature value of the outdoor heat exchanger, a middle coil pipe temperature value of the outdoor heat exchanger, an air inlet temperature value of the indoor heat exchanger, a middle coil pipe temperature value of the indoor heat exchanger and an exhaust temperature value of the compressor through the first thermocouple, the second thermocouple, the third thermocouple, the fourth thermocouple and the fifth thermocouple.

The air conditioner has the advantages that the liquid storage device for storing the refrigerant is arranged, the liquid storage device is communicated with the refrigeration cycle system through the refrigerant filling pipe, and the refrigerant filling pipe is provided with the switch valve; when the air conditioner operates, whether the refrigerating cycle system has the condition of insufficient refrigerant quantity can be judged in real time by monitoring relevant parameter values of the outdoor heat exchanger, the indoor heat exchanger and the compressor, the refrigerant can be filled into the refrigerating cycle system through the control switch valve, and the problem that the refrigerating or heating capacity of the air conditioner is poor due to insufficient refrigerant can be effectively avoided.

Drawings

The present application is described in further detail below in connection with the accompanying drawings and preferred embodiments, but those skilled in the art will appreciate that the drawings are only drawn for the purpose of explaining the preferred embodiments, and therefore should not be taken as limiting the scope of the present application. Furthermore, unless specifically stated otherwise, the drawings are intended to be conceptual in nature or configuration of the described objects and may contain exaggerated displays and are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of an air conditioner according to a first embodiment of the present application;

fig. 2 is an electrical connection diagram of a controller of an air conditioner according to a first embodiment of the present application;

fig. 3 is a control method for preventing an insufficient amount of refrigerant in a refrigeration cycle of an air conditioner in a refrigeration mode according to an embodiment of the present application;

fig. 4 is a schematic structural view of an air conditioner according to a second embodiment of the present application;

fig. 5 is an electrical connection diagram of a controller of an air conditioner according to a second embodiment of the present application;

fig. 6 is a control method for preventing an insufficient amount of refrigerant in a refrigeration cycle in a heating mode of an air conditioner according to a second embodiment of the present application;

fig. 7 is a schematic structural view of an air conditioner according to a third embodiment of the present application;

fig. 8 is an electrical connection diagram of a controller of an air conditioner according to a third embodiment of the present application;

fig. 9 is a control method for preventing a refrigerant shortage in a refrigeration cycle of an air conditioner according to a third embodiment of the present invention.

In the figure, 10, a refrigeration cycle system; 11. a compressor; 12. a throttling device; 13. an indoor heat exchanger; 14. an outdoor heat exchanger; 15. a four-way valve; a. a first valve port; b. a second valve port; c. a third valve port; d. a fourth valve port;

20. a liquid storage device; e. a first refrigerant outlet; f. a second refrigerant outlet;

30. a first refrigerant charging pipe;

40. a first on-off valve;

50. a controller;

60. a second refrigerant charging pipe;

70. a second on-off valve;

81. a first thermocouple; 82. a second thermocouple; 83. a third thermocouple; 84. a fourth thermocouple; 85. and a fifth thermocouple.

Detailed Description

Hereinafter, preferred embodiments of the present application will be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that the descriptions are illustrative only, exemplary, and should not be construed as limiting the scope of the application.

First, it should be noted that the orientations of top, bottom, upward, downward, and the like referred to herein are defined with respect to the orientation in the respective drawings, are relative concepts, and thus can be changed according to different positions and different practical states in which they are located. These and other orientations, therefore, should not be used in a limiting sense.

It should be noted that the term "comprising" does not exclude other elements or steps and the "a" or "an" does not exclude a plurality.

Furthermore, it should be further noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the figures, can still be combined between these technical features (or their equivalents) to obtain other embodiments of the present application not directly mentioned herein.

It will be further understood that the terms "first," "second," and the like, are used herein to describe various information and should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present application.

It should be noted that in different drawings, the same reference numerals indicate the same or substantially the same components.

The refrigeration cycle of an air conditioner includes a series of processes involving compression, condensation, expansion, and evaporation. The compressor compresses refrigerant gas in a high-temperature and high-pressure state, the compressed refrigerant gas is discharged, the discharged refrigerant gas flows into the condenser, the condenser condenses the compressed refrigerant into a liquid phase, heat is released to the surrounding environment through a condensation process, the throttling device enables the liquid phase refrigerant in the high-temperature and high-pressure state condensed in the condenser to be expanded into a low-pressure liquid phase refrigerant, the evaporator evaporates the refrigerant expanded in the throttling device, the evaporator can achieve a refrigeration effect by utilizing the evaporation latent heat of the refrigerant to perform heat exchange with a material to be cooled, and the refrigerant gas in the low-temperature and low-pressure state is returned to the compressor. The air conditioner can adjust the temperature of the indoor space throughout the cycle.

The air conditioner in the present application is shown in fig. 1 to 9, and includes a refrigeration cycle system 10, where the refrigeration cycle system 10 includes a compressor 11, an outdoor heat exchanger 14, a throttling device 12, and an indoor heat exchanger 13, which are connected in sequence through a refrigerant pipeline, and the refrigeration cycle of the air conditioner is executed through the compressor 11, the outdoor heat exchanger 14, the throttling device 12, and the internal heat exchanger.

In addition, in some embodiments of the present invention, a four-way valve 15 is further disposed in the refrigeration cycle system 10, the four-way valve 15 has a first valve port a, a second valve port b, a third valve port c and a fourth valve port d, the exhaust port and the suction port of the compressor 11 are respectively connected to the first valve port a and the second valve port b, one end of the outdoor heat exchanger 14 is connected to the third valve port c, and one end of the indoor heat exchanger 13 is connected to the fourth valve port d. The cooling mode or the heating mode of the air conditioner can be switched by switching the four-way valve 15: when the four-way valve 15 is switched to the first valve port a to be communicated with the third valve port c and the second valve port b to be communicated with the fourth valve port d, the air conditioner is in a cooling mode, and when the indoor heat exchanger 13 is used as an evaporator and the outdoor heat exchanger 14 is used as a condenser, the air conditioner is used as a cooler in the cooling mode; when the four-way valve 15 is switched to the first port a to communicate with the fourth port d and the second port b to communicate with the third port c, the indoor heat exchanger 13 serves as a condenser, the outdoor heat exchanger 14 serves as an evaporator, and the air conditioner serves as a heater for a heating mode.

Several specific embodiments of the air conditioner in the present application are shown below:

example one

As shown in fig. 1 and 2, the air conditioner of the present embodiment includes, in addition to the above-described structure: a liquid storage device 20, a first switching valve 40 and a controller 50; a refrigerant is stored in the liquid storage device 20, and the liquid storage device 20 has a first refrigerant outlet e, and the first refrigerant outlet e is connected to a refrigerant pipeline connecting the throttling device 12 and the indoor heat exchanger 13 through a first refrigerant filling pipe 30; the first switch valve 40 is arranged on the first refrigerant filling pipe 30; the controller 50 is electrically connected to the first switching valve 40 and the compressor 11, respectively.

The air conditioner in this embodiment can automatically fill the refrigeration cycle system 10 with the refrigerant in the refrigeration mode, as shown in fig. 3, the control method for preventing the refrigerant quantity in the refrigeration cycle system 10 from being insufficient in the refrigeration mode specifically includes:

s1, the controller 50 acquires a first actual exhaust temperature value of the compressor 11;

s2, the controller 50 substitutes the obtained operation parameter value of the refrigeration cycle system 10 into a first relational expression preset therein, and calculates a first theoretical exhaust temperature value of the compressor 11; wherein, the first relation records the relation between the discharge temperature value of the compressor 11 and the operation parameter value of the refrigeration cycle system 10 in the refrigeration mode; the operation parameters of the refrigeration cycle system 10 include an operation frequency value of the compressor 11, an inlet air temperature value of the outdoor heat exchanger 14, a middle coil temperature value of the outdoor heat exchanger 14, an inlet air temperature value of the indoor heat exchanger 13 and a middle coil temperature value of the indoor heat exchanger 13;

s3, the controller 50 determines whether the refrigerant charge amount of the refrigeration cycle system 10 is lower than a first threshold value according to the comparison result between the first actual discharge temperature value of the compressor 11 and the first theoretical discharge temperature value of the compressor 11; if the refrigerant quantity in the refrigeration cycle system 10 is insufficient (i.e. the refrigerant charge quantity therein is lower than the first threshold), the second actual discharge temperature of the compressor 11 is inevitably higher than the second theoretical discharge temperature;

s4, when the refrigerant charge of the refrigeration cycle system 10 is lower than the first threshold, indicating that the refrigerant in the refrigeration cycle system 10 is insufficient, the controller 50 controls the first switch valve 40 to open, at this time, a high-pressure liquid refrigerant is in a refrigerant pipeline between the outdoor heat exchanger 14 and the throttling device 12, a low-pressure liquid refrigerant occupies a major portion of the refrigerant pipeline between the indoor heat exchanger 13 and the throttling device 12, and the refrigerant in the liquid storage device 20 flows into the refrigerant pipeline connected to the indoor heat exchanger 13 and the throttling device 12 through the first refrigerant charge pipe 30, so that the refrigeration cycle system 10 is automatically charged with the refrigerant; when the charge amount of the refrigeration cycle system 10 is greater than or equal to the first threshold, indicating that there is no shortage of the refrigerant of the refrigeration cycle system 10, the controller 50 controls the first switching valve 40 to be continuously kept closed.

Based on above-mentioned technical scheme, air conditioner in this embodiment, in the refrigeration process, can real-time supervision refrigeration cycle system 10 in the refrigerant volume whether sufficient, and in case can fill the refrigerant to refrigeration cycle system 10 automatically when discovering the refrigerant volume not enough in order to guarantee the refrigeration ability of air conditioner and can effectively operate under the extremely abominable operating mode of ambient temperature utmost.

More specifically, the first relation is: t is_dt＝a₀+a₁·F+a₂·T1+a₃·T2+a₄·T3+a₅T4; wherein, a₀、a₁、a₂、a₃、a₄、a₅Are weight coefficients and are all constants; t is_dtIs a first theoretical discharge temperature value of the compressor 11, F is an operating frequency value of the compressor 11, T1 is an intake air temperature value of the outdoor heat exchanger 14, T2 is a middle coil temperature value of the outdoor heat exchanger 14, T3 is an intake air temperature value of the indoor heat exchanger 13, and T4 is a middle coil temperature value of the indoor heat exchanger 13.

Wherein, a₀、a₁、a₂、a₃、a₄、a₅Representing the degree of influence on a first theoretical discharge temperature value of the compressor 11, obtained by fitting a large amount of experimental test data; specifically, before each air conditioner leaves the factory, in the cooling mode, by setting a plurality of different sets of frequencies (in Hz) of the compressors 11, the discharge temperature (in ° c) of the compressors 11, the intake temperature (in ° c) of the outdoor heat exchanger 14, the middle coil temperature (in ° c) of the outdoor heat exchanger 14, the intake temperature (in ° c) of the indoor heat exchanger 13, and the middle coil temperature (in Hz) of the indoor heat exchanger 13 corresponding to the frequencies of the compressors 11 are measured, respectively, and then the values of the parameters of the sets are substituted into the first relational expression to obtain a in the first relational expression by fitting₀、a₁、a₂、a₃、a₄、a₅(ii) a In general, a in each air conditioner₀、a₁、a₂、a₃、a₄、a₅All are different.

In some embodiments, the step S3 specifically includes:

according to the formula ∈ ═ T_dr-T_dt)/T_dtCalculating a first deviation ratio; where ε is the first deviation ratio, T_drIs a first actual discharge temperature value for the compressor 11;

when the first deviation ratio is greater than or equal to the first preset value m₁If so, it indicates that the refrigerant charge amount in the refrigeration cycle system 10 is lower than the first threshold, and at this time, it is determined that the refrigerant amount in the refrigeration cycle system 10 is insufficient.

Illustratively, the first preset value m₁10 to 20 percent.

In addition, in some embodiments of the present application, after step S4, the method further includes:

s5, when the opening time of the first switch valve 40 reaches the first preset time t₁When the refrigerant is not filled in the refrigeration cycle system 10, the first switch valve 40 is closed; that is, the amount of refrigerant to be supplied to the refrigeration cycle 10 is controlled in a timed manner.

Illustratively, the first preset time t₁Is 3s to 20 s; and after the primary filling is carried out for 3-20 s, monitoring is continuously carried out to judge whether the filling is still needed, and the steps are circulated until the filling is finished.

Further, the method starts to calculate the operation time of the air conditioner at step S1, and further includes, after step S5:

s6, judging whether the running time of the air conditioner reaches the first preset cycle time t₂When the operation time of the air conditioner reaches t₂The operation time count of the air conditioner is cleared and the operation returns to step S1, i.e., the refrigerant in the refrigeration cycle 10 is periodically monitored and adjusted, which is not only simple to adjust, but also can accurately control the amount of refrigerant charge to the refrigeration cycle 10.

Illustratively, the first preset cycle time t₂Is 1-5 min.

In addition, the air conditioner in the present embodiment further includes a first thermocouple 81, a second thermocouple 82, a third thermocouple 83, a fourth thermocouple 84, and a fifth thermocouple 85; the first thermocouple 81 is arranged at an air inlet of the outdoor heat exchanger 14 and used for detecting the air inlet temperature of the outdoor heat exchanger 14; the second thermocouple 82 is arranged at the middle coil of the outdoor heat exchanger 14 and used for detecting the middle coil temperature of the outdoor heat exchanger 14, the third thermocouple 83 is arranged at the air inlet of the indoor heat exchanger 13 and used for detecting the air inlet temperature of the indoor heat exchanger 13, the fourth thermocouple 84 is arranged at the middle coil of the indoor heat exchanger 13 and used for detecting the middle coil temperature of the indoor heat exchanger 13, and the fifth thermocouple 85 is arranged at the air outlet of the compressor 11 and used for detecting the actual exhaust temperature of the compressor 11.

The controller 50 is electrically connected to the first thermocouple 81, the second thermocouple 82, the third thermocouple 83, the fourth thermocouple 84 and the fifth thermocouple 85, respectively, and in the step S1, the controller 50 obtains the first actual exhaust temperature value of the compressor 11 through the fifth thermocouple 85; in step S2, the controller 50 obtains an intake air temperature value of the outdoor heat exchanger 14, a middle coil temperature value of the outdoor heat exchanger 14, an intake air temperature value of the indoor heat exchanger 13, and a middle coil temperature value of the indoor heat exchanger 13 through the first thermocouple 81, the second thermocouple 82, the third thermocouple 83, and the fourth thermocouple 84, respectively.

Exemplarily, the first switching valve 40 in the present embodiment is a solenoid valve; the liquid storage device 20 is a liquid storage tank.

Example two

The air conditioner in this embodiment, specifically referring to fig. 4 and 5, includes, in addition to the above structure: a liquid storage device 20, a second switching valve 70, and a controller 50; the liquid storage device 20 has a second refrigerant outlet f, the second refrigerant outlet f is connected to a refrigerant pipeline connecting the throttling device 12 and the outdoor heat exchanger 14 through a second refrigerant filling pipe 60, a second switch valve 70 is arranged on the second refrigerant filling pipe 60, and the controller 50 of the second switch valve 70 is electrically connected.

The air conditioner in this embodiment can automatically charge the refrigerant into the refrigeration cycle system 10 in the heating mode, and as shown in fig. 6, the control method for preventing the refrigerant quantity in the heating cycle system from being insufficient in the heating mode specifically includes:

s1', the controller 50 obtains a second actual discharge temperature value of the compressor 11;

s2', the controller 50 substitutes the obtained operation parameter value of the refrigeration cycle system 10 into a second relational expression preset therein to calculate a second theoretical discharge temperature value of the compressor 11; wherein, the second relational expression records the relationship between the discharge temperature value of the compressor 11 and the operation parameter value of the refrigeration cycle system 10 in the heating mode; and the operation parameter values of the refrigeration cycle system 10 comprise an operation frequency value of the compressor 11, an air inlet temperature value of the outdoor heat exchanger 14, a middle coil temperature value of the outdoor heat exchanger 14, an air inlet temperature value of the indoor heat exchanger 13 and a middle coil temperature value of the indoor heat exchanger 13;

s3', the controller 50 determines whether the refrigerant charge amount of the refrigeration cycle system 10 is lower than a second threshold value according to the comparison result between the second actual discharge temperature value of the compressor 11 and the second theoretical discharge temperature value of the compressor 11; if the refrigerant quantity in the refrigeration cycle system 10 is insufficient (i.e. the refrigerant charge quantity therein is lower than the second threshold), the second actual discharge temperature of the compressor is inevitably higher than the second theoretical discharge temperature;

s4', when the refrigerant charge of the refrigeration cycle system 10 is lower than the second threshold, indicating that the refrigerant in the refrigeration cycle system 10 is insufficient, the controller 50 controls the second switch valve 70 to open, at this time, the refrigerant pipeline between the outdoor heat exchanger 14 and the throttling device 12 is a refrigerant with a low-pressure liquid state occupying a major portion, and the refrigerant pipeline between the indoor heat exchanger 13 and the throttling device 12 is a high-pressure liquid refrigerant, and at this time, the refrigerant in the liquid storage device 20 flows into the refrigerant pipeline connected to the outdoor heat exchanger 14 and the throttling device 12 through the second refrigerant charge pipe 60, that is, the refrigerant is automatically charged into the refrigeration cycle system 10; when the charge amount of the refrigeration cycle system 10 is greater than or equal to the second threshold value, which indicates that there is no shortage of the refrigerant of the refrigeration cycle system 10, the controller 50 keeps the second switching valve 70 continuously closed.

Based on above-mentioned technical scheme, the air conditioner in this embodiment, in the heating process, can real-time supervision refrigeration cycle system 10 in the refrigerant volume whether sufficient, and in case can fill the refrigerant to refrigeration cycle system 10 automatically when discovering that the refrigerant volume is not enough to guarantee the heating ability of air conditioner and can effectively operate under the extremely abominable operating mode of ambient temperature extremely low.

More specifically, the second relation is: t is_dt′＝a₆+a₇·F+a₈·T1+a₉·T2+a₁₀·T3+a₁₁T4; wherein, a₆、a₇、a₈、a₉、a₁₀、a₁₁Are weight coefficients and are all constants; t is_dtIs a first theoretical discharge temperature value of the compressor 11, F is an operating frequency value of the compressor 11, T1 is an intake air temperature value of the outdoor heat exchanger 14, T2 is a middle coil temperature value of the outdoor heat exchanger 14, T3 is an intake air temperature value of the indoor heat exchanger 13, and T4 is a middle coil temperature value of the indoor heat exchanger 13.

Wherein, a₆、a₇、a₈、a₉、a₁₀、a₁₁The degree of influence on the second theoretical discharge temperature value of the compressor 11 is represented and is obtained by fitting a large amount of experimental test data; specifically, before each air conditioner leaves the factory, in the heating mode, by setting a plurality of different sets of frequencies (in Hz) of the compressors 11, the discharge temperature (in ° c) of the compressors 11, the intake air temperature (in ° c) of the outdoor heat exchanger 14, the middle coil temperature (in ° c) of the outdoor heat exchanger 14, the intake air temperature (in ° c) of the indoor heat exchanger 13, and the middle coil temperature (in Hz) of the indoor heat exchanger 13 corresponding to the frequencies of the compressors 11 are measured, respectively, and then the values of the parameters of the sets are substituted into the second relational expression to obtain a in the second relational expression by fitting₆、a₇、a₈、a₉、a₁₀、a₁₁(ii) a In general, a in each air conditioner₆、a₇、a₈、a₉、a₁₀、a₁₁All are different.

In some embodiments of the present application, the step S3' specifically includes:

according to the formula ∈ ═ (T)_dr′-T_dt′)/T_dt', calculating a second deviation ratio; where ε' is the second deviation ratio, T_dr' is the second actual discharge temperature value, T, of the compressor 11_dt' is a second theoretical discharge temperature value for the compressor 11;

when the second deviation ratio is greater than or equal to a second preset value m₂If so, it indicates that the refrigerant charge amount in the refrigeration cycle system 10 is lower than the second threshold, and at this time, it is determined that the refrigerant amount in the refrigeration cycle system 10 is insufficient.

Illustratively, the second pre-stageSet value m₂10 to 20 percent.

In addition, in some embodiments of the present application, after step S4', the method further includes:

s5', when the opening time of the second switching valve 70 reaches the second preset time t₃When the refrigerant is not filled in the refrigeration cycle system 10, the second switch valve 70 is closed; that is, the amount of refrigerant to be supplied to the refrigeration cycle 10 is controlled in a timed manner.

Exemplarily, the second preset time t₃Is 3s to 20 s; and after the primary filling is carried out for 3-20 s, monitoring is continuously carried out to judge whether the filling is still needed, and the steps are circulated until the filling is finished.

Further, the method starts calculating the operation time of the air conditioner at step S1, and further includes, after step S5':

s6', judging whether the running time of the air conditioner reaches the second preset cycle time t₄When the operation time of the air conditioner reaches t₄The operation time count of the air conditioner is cleared and the operation returns to step S1', in which the refrigerant in the refrigeration cycle 10 is periodically monitored and adjusted, so that the adjustment is simple and the amount of refrigerant to be charged into the refrigeration cycle 10 can be accurately controlled.

Illustratively, the second preset cycle time t₄Is 1-5 min.

In this embodiment, the refrigerant charge amount in the refrigeration cycle system 10 can be accurately controlled by periodically monitoring and adjusting the refrigerant in the refrigeration cycle system 10.

The air conditioner in the present embodiment further includes a first thermocouple 81, a second thermocouple 82, a third thermocouple 83, a fourth thermocouple 84, and a fifth thermocouple 85; the first thermocouple 81 is arranged at an air inlet of the outdoor heat exchanger 14 and used for detecting the air inlet temperature of the outdoor heat exchanger 14; the second thermocouple 82 is arranged at the middle coil of the outdoor heat exchanger 14 and used for detecting the middle coil temperature of the outdoor heat exchanger 14, the third thermocouple 83 is arranged at the air inlet of the indoor heat exchanger 13 and used for detecting the air inlet temperature of the indoor heat exchanger 13, the fourth thermocouple 84 is arranged at the middle coil of the indoor heat exchanger 13 and used for detecting the middle coil temperature of the indoor heat exchanger 13, and the fifth thermocouple 85 is arranged at the air outlet of the compressor 11 and used for detecting the actual exhaust temperature of the compressor 11.

The controller 50 is electrically connected to the first thermocouple 81, the second thermocouple 82, the third thermocouple 83, the fourth thermocouple 84 and the fifth thermocouple 85, respectively, and in the step S1', the controller 50 obtains a second actual exhaust temperature value of the compressor 11 through the fifth thermocouple 85; in the step S2', the controller 50 obtains an inlet air temperature value of the outdoor heat exchanger 14, a middle coil temperature value of the outdoor heat exchanger 14, an inlet air temperature value of the indoor heat exchanger 13, and a middle coil temperature value of the indoor heat exchanger 13 through the first thermocouple 81, the second thermocouple 82, the third thermocouple 83, and the fourth thermocouple 84, respectively.

Exemplarily, the second switching valve 70 in the present embodiment is a solenoid valve; the liquid storage device 20 is a liquid storage tank.

EXAMPLE III

The air conditioner in the embodiment can realize the automatic refrigerant filling of the refrigeration cycle system 10 in both the refrigeration mode and the heating mode; referring specifically to fig. 7 and 8, in addition to the above structure, it further includes: the liquid storage device 20 is provided with a first refrigerant outlet e and a second refrigerant outlet f, the first refrigerant outlet e is connected to a refrigerant pipeline connecting the throttling device 12 and the indoor heat exchanger 13 through a first refrigerant filling pipe 30, the second refrigerant outlet f is connected to a refrigerant pipeline connecting the throttling device 12 and the outdoor heat exchanger 14 through a second refrigerant filling pipe 60, the first switch valve 40 is arranged on the first refrigerant filling pipe 30, the second switch valve 70 is arranged on the second refrigerant filling pipe 60, and the controller 50 is electrically connected with the first switch valve 40 and the second switch valve 70 respectively.

In the air conditioner of the present embodiment, as shown in fig. 9, when the air conditioner is operated, the controller 50 first needs to determine whether the current operation is the cooling mode or the heating mode;

in the cooling mode, the control method for preventing the refrigerant quantity in the refrigeration cycle system 10 from being insufficient is the same as that in the first embodiment, and is not described herein again, and the second switch valve 70 needs to be controlled to be always kept off in the cooling mode;

in the heating mode, the control for preventing the refrigerant quantity in the refrigeration cycle system 10 from being insufficient is the same as the above embodiment, and is not described herein, and the first switch valve 40 needs to be controlled to be always turned off in the heating mode.

In summary, the present application provides an air conditioner, which has the beneficial effects that a liquid storage device storing a refrigerant is provided, the liquid storage device is communicated with a refrigeration cycle system through a refrigerant filling pipe, and a switch valve is arranged on the refrigerant filling pipe; when the air conditioner operates, whether the refrigerating cycle system has the condition of insufficient refrigerant quantity can be judged in real time by monitoring relevant parameter values of the outdoor heat exchanger, the indoor heat exchanger and the compressor, the refrigerant can be filled into the refrigerating cycle system through the control switch valve, and the problem that the refrigerating or heating capacity of the air conditioner is poor due to insufficient refrigerant can be effectively avoided.

This written description discloses the application with reference to the drawings, and also enables one skilled in the art to practice the application, including making and using any devices or systems, using suitable materials, and using any incorporated methods. The scope of the present application is defined by the claims and includes other examples that occur to those skilled in the art. Such other examples are to be considered within the scope of the claims as long as they include structural elements that do not differ from the literal language of the claims, or that they include equivalent structural elements with insubstantial differences from the literal language of the claims.