CN115751508A - Dehumidifier and control method thereof - Google Patents

Abstract

The invention discloses a dehumidifier and a control method thereof, wherein the dehumidifier comprises: the device comprises a shell, a fan, a refrigerating system, an air duct system, a water storage tank, a temperature sensor, a pressure sensor and a controller; the controller is configured to: judging whether the dehumidifier is in a dehumidification mode or not; when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on a return air pipe when the dehumidifier enters the dehumidification mode and reaches a first preset time, and acquiring a second pressure value on the return air pipe when the dehumidifier enters the dehumidification mode and reaches a second preset time after the first preset time; and judging whether the dehumidifier has refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur, so as to reduce the interference between a defrosting protection program and a refrigerant leakage protection program, improve the accuracy of refrigerant leakage detection and greatly improve the safety.

Description

Dehumidifier and control method thereof

Technical Field

The invention relates to the technical field of dehumidifiers, in particular to a dehumidifier and a control method thereof.

Background

The prior dehumidifier generally has a defrosting protection program and a refrigerant leakage protection program, and the two programs are used as a basis for judging whether to enter the defrosting protection program or the refrigerant leakage protection program based on the 'same temperature-sensing probe detection value on an evaporator', so that the selection of the position of the temperature-sensing probe is crucial and needs to be determined through experimental data so as to consider the normal triggering of the two protection programs as far as possible, but the method has the following defects:

1. the above-mentioned defrost protection procedure does not fully consider the condition of refrigerant leakage, and the phenomenon of unclean defrost or no warning of refrigerant leakage may occur, such as: along with the increase of the leakage rate of the refrigerant, when the evaporator begins to frost from the bottom close to the inlet pipe and the frosting area is reduced to be below the position of the temperature sensing probe, because the detection value of the temperature sensing probe is higher than the set defrosting temperature, a defrosting protection program cannot be triggered, and the defrosting is not clean; meanwhile, under certain working conditions, the refrigerant leakage can cause frosting near the position of the temperature sensing probe, and the dehumidifier directly enters a defrosting mode, but not a refrigerant leakage mode, so that great potential safety hazards exist.

2. The leakage protection program can only prompt leakage alarm information when the leakage rate is higher than 70% -80%, and a user cannot find that the dehumidifier is in an abnormal working state in time, so that the optimal time for human intervention is missed, and great potential safety hazards also exist. Therefore, how to improve the refrigerant leakage detection accuracy and precisely defrost is an urgent problem to be solved.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention aims to provide a dehumidifier and a control method thereof.

The invention provides a dehumidifier, which comprises: the air conditioner comprises a shell, wherein an air inlet and an air outlet are formed in the shell; the fan is arranged in the shell and used for driving air outside the shell to be introduced into the shell through the air inlet and to be discharged from the air outlet; the refrigeration system is arranged in the shell and comprises a compressor, an evaporator and a condenser which are sequentially connected through a refrigerant circulating pipeline, wherein the compressor is used for compressing low-temperature and low-pressure refrigerant gas in the evaporator into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser; the evaporator is used for cooling water vapor in the humid air introduced by the fan to form dry cold air; the condenser is used for heating the dry cold air formed by the evaporator to form dry hot air; the refrigerant circulating pipeline comprises an exhaust pipe connected with the exhaust port of the compressor and an air return pipe connected with the air return port of the compressor; the air duct system is arranged in the shell and comprises a volute and a fan, and the air duct system is used for discharging the dry hot air through the air outlet after the wet air passes through the air duct system and flows through the refrigerating system from the air inlet to form the dry hot air under the driving of the fan; a water storage tank for collecting condensed water generated when the humid air is cooled by the evaporator; the temperature sensor is arranged on the evaporator and used for detecting the temperature of the evaporator; the pressure sensor is arranged on the air return pipe and used for detecting the pressure on the air return pipe when the dehumidifier is in a dehumidification mode or a defrosting mode; the controller is configured to: judging whether the dehumidifier is in the dehumidification mode or not; when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on the air return pipe when the dehumidifier enters the dehumidification mode and reaches a first preset time, and acquiring a second pressure value on the air return pipe when the dehumidifier enters the dehumidification mode and reaches a second preset time after the first preset time; and judging whether the dehumidifier generates refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur.

In addition, the dehumidifier according to the embodiment of the invention can also have the following additional technical characteristics:

further, in determining whether the dehumidifier is in the dehumidification mode, the control appliance is configured to: judging whether the temperature of the evaporator exceeds a first preset temperature or not; when the temperature of the evaporator is judged to exceed the first preset temperature and the duration time exceeds a third preset time, judging that the dehumidifier is in the dehumidification mode; and when the temperature of the evaporator is judged not to exceed the first preset temperature or the temperature of the evaporator exceeds the first preset temperature but the duration time does not exceed a third preset time, judging that the dehumidifier is not in the dehumidification mode.

Further, the controller is configured to: calculating a first average pressure value on the air return pipe within a fourth preset time before the first preset time, and taking the first average pressure value as the first pressure value; and calculating a second average pressure value on the air return pipe within a fifth preset time after the second preset time, and taking the second average pressure value as the second pressure value.

Further, when determining whether the dehumidifier has refrigerant leakage according to the first pressure value and the second pressure value, the controller is configured to: calculating a first difference between the first pressure value and the second pressure value; when the first difference value is larger than a first preset difference value, judging that the dehumidifier has refrigerant leakage; and when the first difference value is not greater than the first preset difference value, judging that the dehumidifier does not leak the refrigerant.

Further, the controller is further configured to: judging whether the dehumidifier is in the defrosting mode or not; when the dehumidifier is judged to be in the defrosting mode, acquiring a third pressure value on the air return pipe when the dehumidifier enters the defrosting mode for a sixth preset time and acquiring a fourth pressure value on the air return pipe when the dehumidifier enters the defrosting mode for a seventh preset time after the sixth preset time; and judging whether the dehumidifier generates refrigerant leakage according to the third pressure value and the fourth pressure value, controlling the fan to stop after judging that the refrigerant leakage occurs, and controlling the fan to continue to operate when judging that the refrigerant leakage does not occur.

Further, when determining whether the dehumidifier is in the defrost mode, the controller is configured to: judging whether the temperature of the evaporator exceeds a second preset temperature or not; when the temperature of the evaporator is judged not to exceed the second preset temperature and the duration time exceeds eighth preset time, judging that the dehumidifier is in the defrosting mode; and when the temperature of the evaporator is judged to exceed the second preset temperature or the temperature of the evaporator does not exceed the second preset temperature but the duration time does not exceed the eighth preset time, judging that the dehumidifier is not in the defrosting mode.

Further, the controller is configured to: calculating a third pressure equalizing value on the air return pipe within a ninth preset time before a sixth preset time, and taking the third pressure equalizing value as the third pressure value; and calculating a fourth average pressure value on the air return pipe within tenth preset time after seventh preset time, and taking the fourth average pressure value as the fourth pressure value.

Further, when determining whether the refrigerant leaks from the dehumidifier according to the third pressure value and the fourth pressure value, the controller is configured to: calculating a second difference between the third pressure value and the fourth pressure value; when the second difference value is larger than a second preset difference value, judging that the dehumidifier has refrigerant leakage; and when the second difference is not greater than the second preset difference, judging that the dehumidifier does not leak the refrigerant.

Further, the controller is further configured to: and controlling the running time of the dehumidifier in the defrosting mode to exceed the sum of the ninth preset time, the tenth preset time and the preset time, wherein the preset time is the difference between the seventh preset time and the sixth preset time.

According to the dehumidifier disclosed by the embodiment of the invention, the pressure value on the return air pipe is detected through the pressure sensor, whether the refrigerant leaks in the dehumidification mode or the defrosting mode of the dehumidifier is judged according to the first preset difference value or the second preset difference value, and logic control is performed, so that the mutual interference between the defrosting protection program and the refrigerant leakage protection program can be reduced, and the refrigerant leakage condition can be detected when the refrigerant amount leaks slightly under the low-temperature working condition, the refrigerant leakage detection precision is improved, and the safety is greatly improved. Furthermore, the selection of the position of the temperature sensor on the evaporator only considers the applicability of a defrosting protection program and does not consider the applicability of a refrigerant leakage protection program, the temperature sensor can be arranged at the position of the lowest point of the temperature distribution of the evaporator, so that the defrosting action of the dehumidifier has pertinence and directionality, and even if the defrosting control logic is not changed, the temperature sensor always acquires the lowest temperature on the evaporator, so that the response accuracy of the defrosting action can be ensured, and the defrosting precision is further improved.

In view of the above existing problems, the present invention further provides a method for controlling a dehumidifier, including: judging whether the dehumidifier is in a dehumidification mode or not; when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a first preset time, and acquiring a second pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a second preset time after the first preset time; and judging whether the dehumidifier generates refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur.

According to the control method of the dehumidifier, disclosed by the embodiment of the invention, the pressure value on the return air pipe is detected through the pressure sensor, whether the refrigerant leaks in the dehumidification mode or the defrosting mode of the dehumidifier is judged according to the first preset difference value or the second preset difference value, and logic control is carried out, so that the mutual interference between the defrosting protection program and the refrigerant leakage protection program can be reduced, and the refrigerant leakage condition can be detected when the refrigerant amount leaks slightly under the low-temperature working condition, the refrigerant leakage detection precision is improved, and the safety is greatly improved. Furthermore, the selection of the position of the temperature sensor on the evaporator only considers the applicability of a defrosting protection program and does not consider the applicability of a refrigerant leakage protection program, the temperature sensor can be arranged at the position of the lowest point of the temperature distribution of the evaporator, so that the defrosting action of the dehumidifier has pertinence and directionality, and even if the defrosting control logic is not changed, the temperature sensor always acquires the lowest temperature on the evaporator, so that the response accuracy of the defrosting action can be ensured, and the defrosting precision is further improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a dehumidifier according to one embodiment of the present invention;

FIG. 2 is a flow diagram of determining whether a dehumidifier is in a dehumidification mode according to one embodiment of the present invention;

FIG. 3 is a flowchart illustrating a method for determining whether a refrigerant leaks from a dehumidifier according to an embodiment of the present invention;

FIG. 4 is a flow chart of the control of a dehumidifier according to one embodiment of the present invention;

FIG. 5 is a flow chart of determining whether the dehumidifier is in the defrost mode according to one embodiment of the present invention;

FIG. 6 is a flowchart illustrating a method for determining whether a refrigerant leaks from a dehumidifier according to another embodiment of the present invention;

fig. 7 is a flowchart of a method of controlling a dehumidifier according to an embodiment of the present invention.

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 is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

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.

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 and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A dehumidifier and a control method thereof according to an embodiment of the present invention will be described with reference to fig. 1 to 7.

Fig. 1 is a schematic structural view of a dehumidifier according to an embodiment of the present invention. As shown in fig. 1, a dehumidifier includes: the air conditioner comprises a cabinet 10, a fan 20, a refrigerating system 30, an air duct system 40, a water storage tank 50, a temperature sensor 60, a pressure sensor 70 and a controller 80. Wherein, the casing 10 is provided with an air inlet and an air outlet; the fan 20 is arranged in the casing 10 and is used for driving air outside the casing 10 to be introduced into the casing 10 through the air inlet and to be discharged from the air outlet; the refrigeration system 30 is arranged in the casing 10, the refrigeration system 30 comprises a compressor 31, an evaporator 32 and a condenser 33 which are sequentially connected through a refrigerant circulation pipeline, wherein the compressor 31 is used for compressing low-temperature and low-pressure refrigerant gas in the evaporator 32 into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser 33; the evaporator 32 is used for cooling water vapor in the humid air introduced by the fan to form dry cold air; the condenser 33 is used for heating the dry cold air formed by the evaporator to form dry hot air; the refrigerant circulating pipeline comprises an exhaust pipe connected with the exhaust port of the compressor and an air return pipe connected with the air return port of the compressor; the air duct system 40 is disposed in the casing 10, the air duct system 40 includes a volute and a fan, and is configured to, under the driving of the fan 20, discharge dry hot air through the air outlet after the wet air passes through the air duct system 40 from the air inlet through the refrigeration system 30 to form dry hot air; the water storage tank 50 is used for collecting condensed water generated when the humid air is cooled by the evaporator 32; the temperature sensor 60 is provided on the evaporator 32, and is used for detecting the temperature of the evaporator 32; the pressure sensor 70 is arranged on the air return pipe of the compressor 31 and used for detecting the pressure on the air return pipe of the compressor 31 when the dehumidifier is in a dehumidification mode or a defrosting mode; the controller 80 is configured to: judging whether the dehumidifier is in a dehumidification mode or not; when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on a return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for a first preset time, and acquiring a second pressure value on the return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for a second preset time after the first preset time; and judging whether the dehumidifier generates refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor 31 and the fan 20 to stop after judging that the refrigerant leakage occurs, and controlling the compressor 31 and the fan 20 to continue to operate when judging that the refrigerant leakage does not occur.

Specifically, when the dehumidifier is in the dehumidification mode, the pressure sensor 70 detects the pressure value on the return pipe of the compressor 31, and since the pressure difference value on the return pipe is different before and after a certain period of time, for example, 10 minutes, if the refrigerant leaks, the pressure value on the return pipe of the compressor 31 will be continuously reduced, so that the pressure difference value before and after a certain period of time is greater than the preset pressure difference value, and at this time, the dehumidifier needs to be controlled to stop operating. The pressure sensor 70 of the embodiment of the invention is only used for detecting the pressure on the return air pipe of the compressor 31 to judge whether the refrigerant leaks, and compared with the traditional scheme that a temperature sensor is used and the defrosting and refrigerant leakage of the dehumidifier are considered at the same time, the embodiment of the invention can identify that the refrigerant leaks when the dehumidifier is in a dehumidification mode and the leakage amount of the refrigerant is not too large, thereby reminding a user to take measures in time, controlling the dehumidifier to stop running and greatly improving the safety.

In a specific embodiment, the first preset time is, for example, 10 minutes, the second preset time is, for example, 13 minutes, when the dehumidifier is in the dehumidification mode, acquiring a first pressure value, for example, P1, on a return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 10 minutes, and a second pressure value, for example, P2, on the return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 13 minutes, determining whether the dehumidifier leaks refrigerant according to the first pressure value P1 and the second pressure value P2, and after determining that the refrigerant leaks, controlling the compressor 31 and the fan 20 to stop, otherwise, controlling the compressor 31 and the fan 20 to continue to operate.

It should be noted that the first preset time may be set periodically, for example, once every 10 minutes, that is, 10 minutes, 20 minutes, 30 minutes, and the like, and correspondingly, the second preset time may also be set periodically, for example, once every 10 minutes, that is, 13 minutes, 23 minutes, 33 minutes, and the like, so that when the dehumidifier does not leak the refrigerant, the pressure sensor 70 may be continuously used to detect the pressure value on the return air pipe of the compressor 31 until it is determined that the refrigerant leaks, and the dehumidifier is controlled to stop operating. Illustratively, when the dehumidifier is in a dehumidification mode, a first pressure value, for example, P1, on a return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 10 minutes, and a second pressure value, for example, P2, on the return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 10 minutes are obtained, at this time, it is judged that the dehumidifier does not leak the refrigerant according to the first pressure value P1 and the second pressure value P2, the pressure value, for example, P1A, on the return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 20 minutes, and the pressure value, for example, P2A, on the return pipe of the compressor 31 when the dehumidifier enters the dehumidification mode for 23 minutes are continuously obtained, at this time, it is judged whether the dehumidifier leaks the refrigerant according to the pressure value P1A and the pressure value P2A, until the refrigerant is judged to leak, the dehumidifier is controlled to stop operating, so that when the refrigerant leakage amount is not too large, the refrigerant can be recognized to leak, a user is further reminded to take measures in time, the dehumidifier is controlled to stop operating, and the safety is greatly improved.

In an embodiment of the present invention, as shown in fig. 2, when determining whether the dehumidifier is in the dehumidification mode, the controller 80 is specifically configured to: determining whether the temperature of the evaporator 32 exceeds a first predetermined temperature; when the temperature of the evaporator 32 is judged to exceed the first preset temperature and the duration time exceeds the third preset time, judging that the dehumidifier is in a dehumidification mode; and when the temperature of the evaporator 32 is judged not to exceed the first preset temperature or the temperature of the evaporator 32 exceeds the first preset temperature but the duration time does not exceed the third preset time, judging that the dehumidifier is not in the dehumidification mode.

Specifically, the temperature of the evaporator 32 is obtained by a temperature sensor provided in the evaporator 32, and the controller 80 determines whether the dehumidifier is in the dehumidification mode based on the temperature of the evaporator 32. Specifically, when the temperature of the evaporator 32 is continuously higher than the defrosting temperature setting value for a period of time, the dehumidifier exits the defrosting mode, the controller 80 controls the compressor to be turned on, and enters the dehumidifying mode, otherwise, the dehumidifier is not in the dehumidifying mode.

In a specific embodiment, the first preset temperature is, for example, T1, the third preset time is, for example, 3 minutes, when the temperature of the evaporator 32 exceeds T1 and the duration reaches 3 minutes, it is determined that the dehumidifier is in the dehumidification mode, and at this time, the compressor 31 is controlled to be turned on, and the dehumidifier enters the dehumidification mode. If the temperature of the evaporator 32 exceeds T1 but the duration time does not exceed 3 minutes, or the temperature of the evaporator 32 does not exceed T1, the dehumidifier is not in the dehumidification mode, so that whether the refrigerant leaks or not is identified when the dehumidifier is in the dehumidification mode, and then when the refrigerant leaks, a user is reminded to take measures in time to control the dehumidifier to stop running, and the safety is greatly improved.

In one embodiment of the present invention, the controller 80 is specifically configured to: calculating a first average pressure value on an air return pipe of the compressor 31 within a fourth preset time before the first preset time, and taking the first average pressure value as a first pressure value; and calculating a second average pressure value on the air return pipe of the compressor 31 within a fifth preset time after the second preset time, and taking the second average pressure value as the second pressure value.

Specifically, since the pressure value in the muffler of the compressor 31 is always in a fluctuating state, in order to improve the accuracy of determining whether the refrigerant leaks, when the first pressure value is obtained, the average pressure value in the muffler of the compressor 31 in the fourth preset time before the first preset time is taken as the first pressure value, and similarly, when the second pressure value is obtained, the average pressure value in the muffler of the compressor 31 in the fifth preset time after the second preset time is taken as the second pressure value, so as to improve the accuracy of pressure measurement in the muffler of the compressor 31, and further improve the accuracy of determining whether the refrigerant leaks.

In a specific embodiment, the first preset time is, for example, 10 minutes, the second preset time is, for example, 13 minutes, the fourth preset time and the fifth preset time are, for example, 2 minutes, an average pressure value in a time period when the dehumidifier enters the dehumidification mode and reaches 8 minutes and 10 minutes is a first pressure value, an average pressure value in a time period when the dehumidifier enters the dehumidification mode and reaches 13 minutes and 15 minutes is a second pressure value, whether the dehumidifier leaks refrigerants or not is judged according to the first pressure value and the second pressure value, after the occurrence of the refrigerant leakage is judged, the compressor 31 and the fan 20 are controlled to stop, and otherwise, the compressor 31 and the fan 20 are controlled to continue to operate.

In an embodiment of the present invention, as shown in fig. 3, when determining whether the dehumidifier has refrigerant leakage according to the first pressure value and the second pressure value, the controller 80 is specifically configured to: calculating a first difference between the first pressure value and the second pressure value; when the first difference value is larger than a first preset difference value, judging that the dehumidifier has refrigerant leakage; and when the first difference is not greater than the first preset difference, judging that the dehumidifier does not leak the refrigerant.

Specifically, when judging whether the dehumidifier leaks the refrigerant according to the first pressure value and the second pressure value, when the first difference value is greater than a first preset difference value, the pressure value on the air return pipe of the compressor 31 is considered to be continuously reduced, and the dehumidifier is judged to leak the refrigerant, otherwise, the dehumidifier does not leak the refrigerant. It should be noted that the first preset difference is determined according to experiments under a working condition commonly used by a user under the condition that the dehumidifier is in the dehumidification mode and no refrigerant leaks, and details are not described here.

In a specific embodiment, the first pressure value is, for example, P1, the second pressure value is, for example, P2, the first difference between the first pressure value and the second pressure value is, for example, Δ P, and the first preset difference is, for example, Δ P1, and then when Δ P > Δ P1, it is determined that refrigerant leakage occurs, the controller 80 may control the prompting unit to issue a refrigerant leakage alarm to prompt a user to take measures in time, and at the same time, the dehumidifier stops operating, so that the safety is greatly improved.

In one embodiment of the present invention, as shown in fig. 4, the controller 80 is further configured to: judging whether the dehumidifier is in a defrosting mode or not; when the dehumidifier is judged to be in the defrosting mode, acquiring a third pressure value on an air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for a sixth preset time, and acquiring a fourth pressure value on the air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for a seventh preset time after the sixth preset time; and judging whether the dehumidifier has refrigerant leakage according to the third pressure value and the fourth pressure value, controlling the fan 20 to stop after judging that the refrigerant leakage occurs, and controlling the fan 20 to continue to operate when judging that the refrigerant leakage does not occur.

Specifically, under a low-temperature working condition, when the dehumidifier is in a defrosting mode, the compressor 31 is in a shutdown state, pressure fluctuation of refrigerant in the refrigeration system 30 is small, if the leakage amount of the refrigerant is small, pressure difference fluctuation on a return air pipe of the compressor 31 is small, if the refrigerant leakage is judged by adopting the same method for judging whether the refrigerant leaks as in the dehumidifying mode, when the refrigerant leaks, the condition that the refrigerant leaks cannot be judged, frosting is caused at an inlet pipe of the evaporator 32, and the dehumidifier enters a defrosting protection program, so that potential safety hazards exist. Therefore, when the dehumidifier is in the defrosting mode, a third pressure value on the air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for a sixth preset time and a fourth pressure value on the air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for a seventh preset time after the sixth preset time are obtained; and judging whether the dehumidifier has refrigerant leakage according to the third pressure value and the fourth pressure value, and controlling the fan 20 to stop after judging that the refrigerant leakage occurs. The pressure sensor 70 of the embodiment of the invention is only used for detecting the pressure on the return pipe of the compressor 31 to judge whether the refrigerant leaks, compared with the traditional scheme that a temperature sensor is used and the defrosting of the dehumidifier and the refrigerant leakage are considered at the same time, the embodiment of the invention can identify that the refrigerant leaks when the dehumidifier is in a defrosting mode and the refrigerant leakage amount is not too large, thereby reminding a user to take measures in time, controlling the dehumidifier to stop running and greatly improving the safety. Meanwhile, the selection of the position of the temperature sensor 60 on the evaporator 32 only considers the applicability of a defrosting protection program and does not consider the applicability of a refrigerant leakage protection program, the temperature sensor 60 can be arranged at the position of the lowest point of the temperature distribution of the evaporator 32, so that the defrosting action of the dehumidifier has pertinence and directionality, and even if the defrosting control logic is not changed, the accuracy of the response of the defrosting action can be ensured because the temperature sensor 60 always acquires the lowest temperature on the evaporator 32, and the defrosting precision is further improved.

In a specific embodiment, the sixth preset time is, for example, 8 minutes, the seventh preset time is, for example, 15 minutes, when the dehumidifier is in the defrosting mode, acquiring a third pressure value, for example, P3, on the air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 8 minutes, and a fourth pressure value, for example, P4, on the air return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 15 minutes, determining whether the dehumidifier has refrigerant leakage according to the third pressure value P3 and the fourth pressure value P4, and after it is determined that the refrigerant leakage occurs, controlling the fan 20 to stop, otherwise, controlling the fan 20 to continue to operate.

It should be noted that the sixth preset time may be set periodically, for example, once every 10 minutes, that is, 8 minutes, 18 minutes, 28 minutes, and the like, and correspondingly, the seventh preset time may also be set periodically, for example, once every 10 minutes, that is, 15 minutes, 25 minutes, 35 minutes, and the like, so that when the dehumidifier does not leak the refrigerant, the pressure sensor 70 may be continuously used to detect the pressure value on the return air pipe of the compressor 31, and the dehumidifier is controlled to stop operating until it is determined that the refrigerant leaks. Illustratively, when the dehumidifier is in a defrosting mode, a third pressure value, for example, P3, on a return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 8 minutes, a fourth pressure value, for example, P4, on the return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 15 minutes is obtained, at this time, it is judged that the dehumidifier does not leak the refrigerant according to the third pressure value P3 and the fourth pressure value P4, at this time, it is continuously obtained that the pressure value, for example, P3A, on the return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 18 minutes, and the pressure value, for example, P4A, on the return pipe of the compressor 31 when the dehumidifier enters the defrosting mode for 25 minutes are obtained, at this time, it is judged whether the refrigerant leaks according to the pressure value P3A and the pressure value P4A, until the refrigerant leaks, the dehumidifier is controlled to stop operating, so that when the refrigerant is in the defrosting mode, and the leakage amount of the refrigerant is not too large, the refrigerant can be recognized to leak, the user is reminded to take timely measures, the dehumidifier is controlled to stop operating, and the safety is greatly improved.

In one embodiment of the present invention, as shown in fig. 5, when determining whether the dehumidifier is in the defrosting mode, the controller 80 is configured to: determining whether the temperature of the evaporator 32 exceeds a second predetermined temperature; when the temperature of the evaporator 32 is judged not to exceed the second preset temperature and the duration time exceeds the eighth preset time, the dehumidifier is judged to be in a defrosting mode; and when the temperature of the evaporator 32 is judged to exceed the second preset temperature or the temperature of the evaporator 32 does not exceed the second preset temperature but the duration time does not exceed the eighth preset time, judging that the dehumidifier is not in the defrosting mode.

Specifically, the temperature of the evaporator 32 is obtained by a temperature sensor 60 provided on the evaporator 32, and the controller determines whether the dehumidifier is in the defrosting mode or not based on the temperature of the evaporator 32. Specifically, when the temperature of the evaporator 32 is continuously lower than the defrosting temperature set value for a period of time, the dehumidifier enters a defrosting mode, the controller 80 controls the compressor 31 to stop and controls the fan 20 to continue to operate, otherwise, the dehumidifier is not in the defrosting mode.

In a specific embodiment, the second preset temperature is, for example, T2, the eighth preset time is, for example, 5 minutes, when the temperature of the evaporator 32 does not exceed T2 and the duration time reaches 5 minutes, it is determined that the dehumidifier is in the defrosting mode, at this time, the compressor 31 is controlled to stop, and the fan 20 is controlled to continue to operate. If the temperature of the evaporator 32 does not exceed T2, but the duration time does not exceed 5 minutes, or the temperature of the evaporator 32 exceeds T2, the dehumidifier is not in the defrosting mode, so that whether the refrigerant leaks or not is identified when the dehumidifier is in the defrosting mode, and then when the refrigerant leaks, a user is reminded to take measures in time to control the dehumidifier to stop running, and the safety is greatly improved.

In one embodiment of the present invention, the controller 80 is specifically configured to: calculating a third pressure equalizing value on the air return pipe of the compressor 31 within a ninth preset time before the sixth preset time, and taking the third pressure equalizing value as a third pressure value; and calculating a fourth average pressure value on the muffler of the compressor 31 within a tenth preset time after the seventh preset time, and taking the fourth average pressure value as a fourth pressure value.

Specifically, since the pressure value in the muffler of the compressor 31 is always in a fluctuating state, in order to improve the accuracy of determining whether the refrigerant leaks, when the third pressure value is obtained, the average pressure value in the muffler of the compressor 31 in the ninth preset time before the sixth preset time is taken as the third pressure value, and similarly, when the fourth pressure value is obtained, the average pressure value in the muffler of the compressor 31 in the tenth preset time after the seventh preset time is taken as the fourth pressure value, so as to improve the accuracy of pressure measurement in the muffler of the compressor 31, and further improve the accuracy of determining whether the refrigerant leaks.

In a specific embodiment, the sixth preset time is, for example, 8 minutes, the seventh preset time is, for example, 15 minutes, the ninth preset time and the tenth preset time are, for example, 2 minutes, an average pressure value in a time period when the dehumidifier enters the defrosting mode and reaches 6 minutes and 8 minutes is a third pressure value, an average pressure value in a time period when the dehumidifier enters the defrosting mode and reaches 15 minutes and 17 minutes is a fourth pressure value, and then whether the dehumidifier leaks refrigerant is determined according to the third pressure value and the fourth pressure value, and after it is determined that the refrigerant leaks, the dehumidifier is controlled to stop operating, otherwise, the fan 20 is controlled to continue operating.

In an embodiment of the present invention, as shown in fig. 6, when determining whether the dehumidifier leaks the refrigerant according to the third pressure value and the fourth pressure value, the controller 80 is specifically configured to: calculating a second difference between the third pressure value and the fourth pressure value; when the second difference value is larger than a second preset difference value, judging that the dehumidifier has refrigerant leakage; and when the second difference is not larger than the second preset difference, judging that the dehumidifier does not leak the refrigerant.

Specifically, when judging whether the dehumidifier has refrigerant leakage according to the third pressure value and the fourth pressure value, when the second difference is greater than the second preset difference, it is determined that the pressure value on the return pipe of the compressor 31 is continuously decreased, and it is judged that the dehumidifier has refrigerant leakage, otherwise, the dehumidifier has no refrigerant leakage. It should be noted that the second preset difference is determined according to experiments under a working condition commonly used by a user under the condition that the dehumidifier is in the defrosting mode and no refrigerant leaks, and details are not described here.

In a specific embodiment, the third pressure value is, for example, P3, the fourth pressure value is, for example, P4, the second difference between the third pressure value and the fourth pressure value is, for example, Δ P0, and the first preset difference is, for example, Δ P2, when Δ P0> Δ P2, it is determined that refrigerant leakage occurs, the controller 80 may control the prompting unit to issue a refrigerant leakage alarm to remind a user to take measures in time, and at the same time, the dehumidifier stops operating, so that the safety is greatly improved.

Therefore, the method for judging whether the refrigerant leaks or not when the dehumidifier is in the dehumidification mode and the defrosting mode is approximately the same, and only the preset first preset difference value and the preset second preset difference value are different, namely, the embodiment of the invention provides the preset pressure difference value for the dehumidification mode and the defrosting mode of the dehumidifier respectively to carry out logic control, so that the mutual interference between a defrosting protection program and the refrigerant leakage protection program can be reduced, the refrigerant leakage condition can be detected when the refrigerant leaks slightly under the low-temperature working condition, the refrigerant leakage detection precision is improved, and the safety is greatly improved.

In one embodiment of the present invention, the controller 80 is further configured to: and controlling the running time of the dehumidifier in the defrosting mode to exceed the sum of a ninth preset time, a tenth preset time and a preset time, wherein the preset time is the difference between a seventh preset time and a sixth preset time.

Specifically, in order to enable the pressure sensor 70 to obtain the pressure value for a sufficient time and improve the accuracy of the judgment of the refrigerant leakage, the minimum time for the fan 20 to continuously operate for defrosting in the defrosting protection program is specified to be greater than the sum of the ninth preset time, the tenth preset time and the preset time.

In an embodiment, the ninth preset time and the tenth preset time are, for example, 2 minutes, the sixth preset time is, for example, 8 minutes, and the seventh preset time is, for example, 15 minutes, and then the minimum time for the fan 20 to continuously operate for defrosting is greater than 11 minutes, so as to improve the accuracy of determining the refrigerant leakage.

According to the dehumidifier disclosed by the embodiment of the invention, the pressure value on the return air pipe of the compressor 31 is detected through the pressure sensor 70, whether the refrigerant leaks in the dehumidification mode or the defrosting mode is judged according to the first preset difference value or the second preset difference value, and logic control is performed, so that the mutual interference between the defrosting protection program and the refrigerant leakage protection program can be reduced, and the refrigerant leakage condition can be detected when the refrigerant leaks slightly under the low-temperature working condition, the refrigerant leakage detection precision is improved, and the safety is greatly improved. Furthermore, the selection of the temperature sensor position 60 on the evaporator 32 only considers the applicability of the defrosting protection program, and does not consider the applicability of the refrigerant leakage protection program, and the temperature sensor 60 can be arranged at the position of the lowest point of the temperature distribution of the evaporator 32, so that the defrosting action of the dehumidifier has more pertinence and directionality, and even if the defrosting control logic is not changed, the accuracy of the response of the defrosting action can be ensured because the temperature sensor 60 always acquires the lowest temperature on the evaporator 32, and the defrosting precision is further improved.

A further embodiment of the present invention further discloses a method for controlling a dehumidifier, and fig. 7 is a flowchart of the method for controlling a dehumidifier according to an embodiment of the present invention. As shown in fig. 7, the method comprises the steps of:

step S1, judging whether the dehumidifier is in a dehumidification mode.

And S2, when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on the air return pipe when the dehumidifier enters the dehumidification mode and reaches a first preset time, and acquiring a second pressure value on the air return pipe when the dehumidifier enters the dehumidification mode and reaches a second preset time after the first preset time.

And S3, judging whether the dehumidifier has refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur.

In one embodiment of the present invention, the determining whether the dehumidifier is in the dehumidification mode includes: judging whether the temperature of the evaporator exceeds a first preset temperature or not; when the temperature of the evaporator is judged to exceed the first preset temperature and the duration time exceeds the third preset time, judging that the dehumidifier is in a dehumidification mode; and when the temperature of the evaporator is judged not to exceed the first preset temperature or the temperature of the evaporator exceeds the first preset temperature but the duration time does not exceed the third preset time, judging that the dehumidifier is not in a dehumidification mode.

In one embodiment of the invention, when the dehumidifier is judged to be in the dehumidification mode, a first average pressure value on the air return pipe is calculated within a fourth preset time before the first preset time, and the first average pressure value is taken as a first pressure value; and calculating a second average pressure value on the air return pipe within a fifth preset time after the second preset time, and taking the second average pressure value as a second pressure value.

In an embodiment of the present invention, determining whether the dehumidifier leaks the refrigerant according to the first pressure value and the second pressure value includes: calculating a first difference between the first pressure value and the second pressure value; when the first difference value is larger than a first preset difference value, judging that the dehumidifier has refrigerant leakage; and when the first difference is not larger than the first preset difference, judging that the dehumidifier does not leak the refrigerant.

In one embodiment of the present invention, the method further comprises: judging whether the dehumidifier is in a defrosting mode or not; when the dehumidifier is judged to be in the defrosting mode, a third pressure value on the air return pipe when the dehumidifier enters the defrosting mode for sixth preset time and a fourth pressure value on the air return pipe when the dehumidifier enters the defrosting mode for seventh preset time after the sixth preset time; and judging whether the dehumidifier generates refrigerant leakage according to the third pressure value and the fourth pressure value, controlling the fan to stop after judging that the refrigerant leakage occurs, and controlling the fan to continue to operate when judging that the refrigerant leakage does not occur.

In one embodiment of the present invention, the determining whether the dehumidifier is in the defrosting mode includes: judging whether the temperature of the evaporator exceeds a second preset temperature or not; when the temperature of the evaporator is judged not to exceed the second preset temperature and the duration time exceeds the eighth preset time, the dehumidifier is judged to be in a defrosting mode; and when the temperature of the evaporator is judged to exceed the second preset temperature or the temperature of the evaporator does not exceed the second preset temperature but the duration time does not exceed the eighth preset time, judging that the dehumidifier is not in the defrosting mode.

In an embodiment of the invention, when the dehumidifier is judged to be in the defrosting mode, a third pressure equalizing value on the air return pipe is calculated within a ninth preset time before a sixth preset time, and the third pressure equalizing value is used as a third pressure value; and calculating a fourth equalizing pressure value on the air return pipe within tenth preset time after the seventh preset time, and taking the fourth equalizing pressure value as a fourth pressure value.

In an embodiment of the present invention, the determining whether the dehumidifier leaks the refrigerant according to the third pressure value and the fourth pressure value includes: calculating a second difference between the third pressure value and the fourth pressure value; when the second difference value is larger than a second preset difference value, judging that the dehumidifier has refrigerant leakage; and when the second difference is not larger than the second preset difference, judging that the dehumidifier does not leak the refrigerant.

In an embodiment of the invention, the operation time of the dehumidifier in the defrosting mode is controlled to exceed the sum of a ninth preset time, a tenth preset time and a preset time, wherein the preset time is the difference between the seventh preset time and the sixth preset time.

It should be noted that, when the dehumidifier according to the embodiment of the present invention performs defrosting control and refrigerant leakage detection, a specific implementation manner of the dehumidifier is similar to a specific implementation manner of the control method of the dehumidifier controller according to the embodiment of the present invention, and reference is specifically made to the description of the method portion, and details are not described here again in order to reduce redundancy.

According to the control method of the dehumidifier, disclosed by the embodiment of the invention, the pressure value on the return air pipe is detected through the pressure sensor, whether the refrigerant leaks in the dehumidification mode or the defrosting mode of the dehumidifier is judged according to the first preset difference value or the second preset difference value, and logic control is carried out, so that the mutual interference between the defrosting protection program and the refrigerant leakage protection program can be reduced, and the refrigerant leakage condition can be detected when the refrigerant leaks slightly under the low-temperature working condition, the refrigerant leakage detection precision is improved, and the safety is greatly improved. Furthermore, the selection of the position of the temperature sensor on the evaporator only considers the applicability of a defrosting protection program and does not consider the applicability of a refrigerant leakage protection program, the temperature sensor can be arranged at the position of the lowest point of the temperature distribution of the evaporator, so that the defrosting action of the dehumidifier has pertinence and directionality, and even if the defrosting control logic is not changed, the temperature sensor always acquires the lowest temperature on the evaporator, so that the accuracy of the response of the defrosting action can be ensured, and the defrosting precision is further improved.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A dehumidifier, comprising:

the air conditioner comprises a shell, a fan and a fan, wherein an air inlet and an air outlet are formed in the shell;

the fan is arranged in the shell and used for driving air outside the shell to be introduced into the shell through the air inlet and to be discharged from the air outlet;

the refrigeration system is arranged in the shell and comprises a compressor, an evaporator and a condenser which are sequentially connected through a refrigerant circulating pipeline, wherein the compressor is used for compressing low-temperature and low-pressure refrigerant gas in the evaporator into high-temperature and high-pressure refrigerant gas and discharging the high-temperature and high-pressure refrigerant gas to the condenser; the evaporator is used for cooling water vapor in the humid air introduced by the fan to form dry cold air; the condenser is used for heating the dry cold air formed by the evaporator to form dry hot air; the refrigerant circulating pipeline comprises an exhaust pipe connected with the exhaust port of the compressor and an air return pipe connected with the air return port of the compressor;

the air duct system is arranged in the shell and comprises a volute and a fan, and the air duct system is used for discharging dry hot air through the air outlet after the wet air passes through the air duct system and flows through the refrigerating system from the air inlet to form the dry hot air under the driving of the fan;

a water storage tank for collecting condensed water generated when the humid air is cooled by the evaporator;

it is characterized by also comprising:

the temperature sensor is arranged on the evaporator and used for detecting the temperature of the evaporator;

the pressure sensor is arranged on the air return pipe and used for detecting the pressure on the air return pipe when the dehumidifier is in a dehumidification mode or a defrosting mode;

the controller is configured to: judging whether the dehumidifier is in the dehumidification mode or not;

when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a first preset time, and acquiring a second pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a second preset time after the first preset time;

and judging whether the dehumidifier generates refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur.

2. The dehumidifier of claim 1, wherein in determining whether the dehumidifier is in the dehumidification mode, the control means is configured to:

judging whether the temperature of the evaporator exceeds a first preset temperature or not;

when the temperature of the evaporator is judged to exceed the first preset temperature and the duration time exceeds a third preset time, judging that the dehumidifier is in the dehumidification mode;

and when the temperature of the evaporator is judged not to exceed the first preset temperature or the temperature of the evaporator exceeds the first preset temperature but the duration time does not exceed a third preset time, judging that the dehumidifier is not in the dehumidification mode.

3. The dehumidifier of claim 1 wherein the control means is configured to:

calculating a first average pressure value on the air return pipe within a fourth preset time before the first preset time, and taking the first average pressure value as the first pressure value;

and calculating a second average pressure value on the air return pipe within a fifth preset time after the second preset time, and taking the second average pressure value as the second pressure value.

4. The dehumidifier of claim 1, wherein when determining whether the dehumidifier leaks refrigerant according to the first pressure value and the second pressure value, the controller is configured to:

calculating a first difference between the first pressure value and the second pressure value;

when the first difference value is larger than a first preset difference value, judging that the dehumidifier has refrigerant leakage;

and when the first difference value is not greater than the first preset difference value, judging that the dehumidifier does not leak the refrigerant.

5. The air conditioner of claim 1, wherein the controller is further configured to:

judging whether the dehumidifier is in the defrosting mode or not;

when the dehumidifier is judged to be in the defrosting mode, acquiring a third pressure value on the air return pipe when the dehumidifier enters the defrosting mode for a sixth preset time and acquiring a fourth pressure value on the air return pipe when the dehumidifier enters the defrosting mode for a seventh preset time after the sixth preset time;

and judging whether the dehumidifier has refrigerant leakage according to the third pressure value and the fourth pressure value, controlling the fan to stop after judging that the refrigerant leakage occurs, and controlling the fan to continue to operate when judging that the refrigerant leakage does not occur.

6. The dehumidifier of claim 5, wherein when determining whether the dehumidifier is in the defrost mode, the controller is configured to:

judging whether the temperature of the evaporator exceeds a second preset temperature or not;

when the temperature of the evaporator is judged not to exceed the second preset temperature and the duration time exceeds the eighth preset time, the dehumidifier is judged to be in the defrosting mode;

and when the temperature of the evaporator is judged to exceed the second preset temperature or the temperature of the evaporator does not exceed the second preset temperature but the duration time does not exceed the eighth preset time, judging that the dehumidifier is not in the defrosting mode.

7. The dehumidifier of claim 5 wherein the control means is configured to:

calculating a third pressure equalizing value on the air return pipe within a ninth preset time before a sixth preset time, and taking the third pressure equalizing value as the third pressure value;

and calculating a fourth equalizing pressure value on the air return pipe within a tenth preset time after the seventh preset time, and taking the fourth equalizing pressure value as the fourth pressure value.

8. The dehumidifier of claim 5, wherein when determining whether the refrigerant leakage occurs in the dehumidifier according to the third pressure value and the fourth pressure value, the controller is configured to:

calculating a second difference between the third pressure value and the fourth pressure value;

when the second difference value is larger than a second preset difference value, judging that the dehumidifier has refrigerant leakage;

and when the second difference is not greater than the second preset difference, judging that the dehumidifier does not leak the refrigerant.

9. The dehumidifier of claim 7, wherein the controller is further configured to: and controlling the running time of the dehumidifier in the defrosting mode to exceed the sum of the ninth preset time, the tenth preset time and the preset time, wherein the preset time is the difference between the seventh preset time and the sixth preset time.

10. A method for controlling a dehumidifier is characterized by comprising the following steps:

judging whether the dehumidifier is in a dehumidification mode or not;

when the dehumidifier is judged to be in the dehumidification mode, acquiring a first pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a first preset time, and acquiring a second pressure value on the air return pipe when the dehumidifier enters the dehumidification mode for a second preset time after the first preset time;

and judging whether the dehumidifier has refrigerant leakage according to the first pressure value and the second pressure value, controlling the compressor and the fan to stop after judging that the refrigerant leakage occurs, and controlling the compressor and the fan to continue to operate when judging that the refrigerant leakage does not occur.

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