CN115523749A - Heat pump dryer, heat pump dryer control method, heat pump dryer control device and readable storage medium - Google Patents
Heat pump dryer, heat pump dryer control method, heat pump dryer control device and readable storage medium Download PDFInfo
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- 238000001035 drying Methods 0.000 claims abstract description 99
- 238000004590 computer program Methods 0.000 claims description 16
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 238000007791 dehumidification Methods 0.000 claims description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
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Abstract
The invention provides a heat pump dryer, a heat pump dryer control method, a heat pump dryer control device and a readable storage medium, and relates to the technical field of drying, wherein the method comprises the following steps: acquiring an air inlet water moisture content and an air outlet water moisture content of a drying chamber in the heat pump dryer; acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the moisture content of the air inlet mouth and the moisture content of the air outlet mouth; the current operation frequency of the compressor in the heat pump dryer is adjusted based on the moisture content variation to control the operation of the compressor based on the current operation frequency, so that the technical problem of how to better control the heat pump dryer in the prior art is solved.
Description
Technical Field
The invention relates to the technical field of drying, in particular to a heat pump dryer, a heat pump dryer control method, a heat pump dryer control device and a readable storage medium.
Background
The heat pump dryer mainly uses condensation heat to heat and dehumidify objects, fig. 1 shows a schematic diagram of a working principle of a heat pump dryer system, the heat pump dryer system may include an evaporator (external unit), a heat pump compressor, a condenser (internal unit), an expansion valve, a controller, etc., during drying, a thermodynamic cycle process of "evaporation → compression → condensation → throttling → re-evaporation" is continuously repeated in the system by a refrigerant, heat released in the thermodynamic cycle process can be continuously transferred to a drying area, and continuous drying of materials to be dried in the drying area is realized.
However, the existing heat pump dryer control method is too simple and coarse, and cannot accurately judge whether the dryness of the heated dehumidification object meets the requirement, the drying efficiency is poor, and the energy consumption of the heat pump dryer is high.
Therefore, how to better control the heat pump dryer has become an urgent technical problem to be solved in the industry.
Disclosure of Invention
The invention provides a heat pump dryer, a heat pump dryer control method, a heat pump dryer control device and a readable storage medium, which are used for solving the technical problem of how to better control the heat pump dryer in the prior art, accurately judging whether the dryness of a heated dehumidifying object meets the requirement or not, improving the drying efficiency and reducing the energy consumption of the heat pump dryer.
The invention provides a heat pump dryer control method, which comprises the following steps: acquiring an air inlet buccal moisture content and an air outlet buccal moisture content of a drying chamber in the heat pump dryer;
acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the air inlet mouth moisture content and the air outlet mouth moisture content;
adjusting a current operating frequency of a compressor in the heat pump dryer based on the moisture content variation amount to control the compressor to operate based on the current operating frequency.
According to the control method of the heat pump dryer provided by the invention, the step of acquiring the moisture content of the air inlet mouth and the moisture content of the air outlet mouth of the drying chamber in the heat pump dryer comprises the following steps:
acquiring the temperature of an air inlet, the relative humidity of the air inlet, the temperature of an air outlet and the relative humidity of the air outlet of the drying chamber;
acquiring the moisture content of the air intake mouth of the drying chamber based on the temperature of the air inlet and the relative humidity of the air inlet;
and acquiring the moisture content of the air outlet mouth of the drying chamber based on the air outlet temperature and the air outlet relative humidity.
According to the heat pump dryer control method provided by the invention, the adjusting the current operation frequency of the compressor in the heat pump dryer based on the moisture content variation comprises the following steps:
judging whether the moisture content variation is larger than a preset first humidity threshold value or not to obtain a first judgment result;
and acquiring the maximum operation frequency of the compressor, and determining the current operation frequency of the compressor based on the first judgment result and the maximum operation frequency.
According to the heat pump dryer control method provided by the present invention, the determining the current operating frequency of the compressor based on the first determination result and the maximum operating frequency includes:
determining a current operating frequency of the compressor as the maximum operating frequency in the case that the moisture content variation is greater than the first humidity threshold;
and determining the current operating frequency of the compressor based on the moisture content variation, a preset second humidity threshold and the maximum operating frequency under the condition that the moisture content variation is smaller than or equal to the first humidity threshold.
According to the heat pump dryer control method provided by the invention, the determining the current operation frequency of the compressor based on the moisture content variation, the preset second humidity threshold and the maximum operation frequency comprises the following steps:
judging whether the moisture content variation is larger than a second humidity threshold value, wherein the second humidity threshold value is smaller than the first humidity threshold value;
updating the current operating frequency of the compressor based on a preset frequency decreasing parameter and the maximum operating frequency in the case that the moisture content variation is greater than the second humidity threshold;
and controlling the compressor to stop running under the condition that the moisture content variation is smaller than or equal to the second humidity threshold value.
According to the heat pump dryer control method provided by the present invention, the updating the current operating frequency of the compressor based on the preset frequency decreasing parameter and the maximum operating frequency comprises:
determining a new current operating frequency based on the current operating frequency and the frequency decrement parameter, and taking the new current operating frequency as the current operating frequency of the compressor;
acquiring current waiting time length, and judging whether the current waiting time length is greater than preset single frequency control time length or not;
acquiring the moisture content variation between the air outlet and the air inlet of the drying chamber under the condition that the current waiting time is longer than the single frequency control time;
determining a preset operation frequency threshold value based on the maximum operation frequency and a preset threshold value coefficient, and judging whether the moisture content variation is larger than the second humidity threshold value;
and under the condition that the moisture content variation is larger than the second humidity threshold, repeatedly executing the steps until the current operation frequency of the compressor reaches the preset operation frequency threshold.
The invention also provides a control device of the heat pump dryer, which comprises: the first acquisition module is used for acquiring the moisture content of the air inlet mouth and the moisture content of the air outlet mouth of a drying chamber in the heat pump dryer;
the second acquisition module is used for acquiring moisture content variation between the air inlet and the air outlet of the drying chamber based on the air inlet mouth moisture content and the air outlet mouth moisture content;
and the operation control module is used for adjusting the current operation frequency of a compressor in the heat pump dryer based on the moisture content variation so as to control the operation rate of the compressor based on the current operation frequency.
The invention also provides a heat pump dryer, which comprises an evaporator, a compressor, a condenser, a dehumidifier, an electric heater, a first expansion valve and a second expansion valve; the compressor, the condenser, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the evaporator, the compressor, the condenser and the second expansion valve are sequentially connected to form a drying thermodynamic loop; the electric heater is arranged between the condenser and an air inlet of a drying chamber of the heat pump dryer;
further comprising: the device comprises a first temperature sensor, a first humidity sensor, a second temperature sensor, a second humidity sensor and a controller; the first temperature sensor and the first humidity sensor are arranged at an air inlet of the drying chamber, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of the air inlet and the relative humidity of the air inlet; the second temperature sensor and the second humidity sensor are arranged at an air outlet of the drying chamber, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of an air outlet and the relative humidity of the air outlet;
the controller comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, and the processor executes the program to realize the heat pump dryer control method.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the heat pump dryer control method as described in any one of the above.
The present invention also provides a computer program product comprising a computer program which, when executed by a processor, implements a heat pump dryer control method as defined in any one of the above.
According to the heat pump dryer, the heat pump dryer control method and device and the readable storage medium, the moisture content variation between the air inlet and the air outlet of the drying chamber is obtained, the current drying state of the dried object is accurately judged based on the moisture content variation, and the compressor and other components are controlled according to the current drying state of the dried object, so that the aim of accurately controlling the dryness of the dried object is fulfilled, and the technical problem that the heat pump dryer is better controlled in the prior art is solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the operation of a prior art heat pump dryer system;
fig. 2 is a schematic structural diagram of a heat pump dryer according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a controller in a heat pump dryer according to an embodiment of the present invention
Fig. 4 is a schematic flow chart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 5 is a second schematic flow chart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 6 is a third schematic flow chart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 7 is a fourth schematic flowchart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 8 is a fifth flowchart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 9 is a sixth schematic flowchart of a heat pump dryer control method according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a heat pump dryer control device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 2 schematically illustrates a schematic structure of a heat pump dryer according to an embodiment of the present invention, and referring to fig. 2, the heat pump dryer includes an evaporator 201, a compressor 202, a condenser 203, a dehumidifier 204, an electric heater 205, a first expansion valve 206, a second expansion valve 207, a first temperature sensor 208, a second temperature sensor 209, a first humidity sensor 210, a second humidity sensor 211, and a controller 212, wherein:
the compressor 202, the condenser 203, the first expansion valve 206 and the dehumidifier 204 are connected in sequence to form a dehumidification thermodynamic loop; the evaporator 201, the compressor 202, the condenser 203 and the second expansion valve 207 are connected in sequence to form a drying thermodynamic loop; the electric heater 205 is disposed between the condenser 203 and the air inlet 10 of the drying chamber of the heat pump dryer.
The first temperature sensor 208 and the first humidity sensor 210 are disposed at the air inlet 10, and are respectively electrically connected to the controller 212 for respectively acquiring an air inlet temperature and an air inlet relative humidity; the second temperature sensor 209 and the second humidity sensor 211 are disposed at the air outlet 20 of the drying chamber, and are electrically connected to the controller 212, respectively, for collecting the temperature of the air outlet and the relative humidity of the air outlet.
The controller 212 is electrically connected to the evaporator 201, the compressor 202, the condenser 203, the dehumidifier 204, the electric heater 205, the first expansion valve 206, and the second expansion valve 207, respectively, for controlling the operations of these components. Based on this, when the heat pump dryer heats, the refrigerant can repeat the thermodynamic cycle process of evaporation, compression, condensation, throttling and re-evaporation continuously, and meanwhile, the heat released in the thermodynamic cycle process is transferred into the drying chamber continuously, so as to heat and dehumidify the dried object in the drying chamber continuously until the dried object is dried.
Fig. 3 illustrates a physical structure diagram of a controller, and as shown in fig. 3, the controller 212 may include: a processor (processor) 310, a communication Interface (communication Interface) 320, a memory (memory) 330 and a communication bus 340, wherein the processor 310, the communication Interface 320 and the memory 330 communicate with each other via the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to implement any heat pump dryer control method provided by the present invention, specifically, to calculate the moisture content variation between the inlet 10 and the outlet 20 of the drying chamber based on the inlet temperature, the inlet relative humidity, the inlet temperature, and the inlet relative humidity; adjusting a current operation frequency of a compressor in the heat pump dryer based on the moisture content variation, to control the operation of the compressor based on the current operation frequency, and to control an operation state of an electric heater 205 of the heat pump dryer, so as to continuously heat the drying object in the drying chamber until the drying object is dried.
In addition, the logic instructions in the memory 330 may be implemented in the form of software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
According to the heat pump dryer provided by the invention, the first temperature sensor and the first humidity sensor are arranged at the air inlet of the drying chamber, and the second temperature sensor and the second humidity sensor are arranged at the air outlet of the drying chamber, so that the temperature and the relative humidity at the air inlet and the air outlet of the drying chamber can be acquired in real time, the moisture content variation between the air inlet and the air outlet of the drying chamber is further obtained, the current drying state of the dried object is accurately judged based on the moisture content variation, and the compressor and other components are controlled according to the current drying state of the dried object, so that the aim of accurately controlling the dryness of the dried object is fulfilled, and the technical problem of better controlling the heat pump dryer in the prior art is solved.
Based on the heat pump dryer provided in the embodiment corresponding to fig. 2, the following describes a heat pump dryer control method based on the temperature of the air inlet according to the present invention with reference to fig. 4.
The heat pump dryer control method of the present invention will be described with reference to fig. 4 to 9. As shown in fig. 4, the present invention provides a heat pump dryer control method, including:
and S100, acquiring an air inlet water containing moisture content and an air outlet water containing moisture content of a drying chamber in the heat pump dryer.
Wherein, the moisture content in the air inlet of the drying chamber is represented by the moisture content in the air inlet of the drying chamber. The moisture content of the air outlet mouth represents the moisture content of the air outlet of the drying chamber. The moisture content means the amount of water vapor contained per kg of dry air, and is expressed in kg/kg of dry air. And S200, acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the moisture content of the air inlet mouth and the moisture content of the air outlet mouth.
Specifically, an absolute value of a difference value between the moisture content of the air inlet mouth and the moisture content of the air outlet mouth is obtained, and the absolute value is used as the moisture content variation between the air inlet and the air outlet of the drying chamber.
And step S300, adjusting the current operation frequency of the compressor in the heat pump dryer based on the moisture content variation to control the operation of the compressor based on the current operation frequency.
In the steps S100 to S300, the moisture content variation between the air inlet and the air outlet of the drying chamber is obtained to accurately determine the current drying state of the object to be dried based on the moisture content variation, and the compressor and other components are controlled according to the current drying state of the object to be dried, so that the purpose of accurately controlling the dryness of the object to be dried is achieved, and the technical problem of better controlling the heat pump dryer in the prior art is solved.
In one embodiment, as shown in fig. 5, the step S100 includes steps S51 to S53, wherein:
and S51, acquiring the air inlet temperature, the air inlet relative humidity, the air outlet temperature and the air outlet relative humidity of the drying chamber.
The relative humidity is the percentage of the actual water vapor content in the air sample to the water vapor content of the saturated air with the same volume at the same temperature, and is the most common humidity value which can be directly observed. Tin is used to represent inlet temperature, rhin is used to represent inlet relative humidity, tout is used to represent outlet temperature, and Rhout is used to represent outlet relative humidity.
Specifically, relative humidity = absolute humidity/saturated humidity 100%, where saturated humidity is the maximum amount of water vapor that can be contained in the sample air at a certain temperature (above this amount, condensation occurs, and water drops appear on the wall), and is called saturated humidity.
And S52, acquiring the moisture content of the air intake mouth of the drying chamber based on the temperature of the air inlet and the relative humidity of the air inlet.
In one embodiment, the inlet air moisture content of the drying chamber can be obtained based on the enthalpy diagram of the humid air, the inlet air temperature and the inlet air relative humidity. Wherein, the abscissa in the psychrometric chart of the humid air is the moisture content, the ordinate is the temperature, and the arc-shaped curve is the relative humidity curve. Specifically, the abscissa of the intersection point of the arc curve corresponding to the ordinate corresponding to the temperature of the air inlet and the relative humidity of the air inlet can be determined, and the abscissa of the intersection point is used as the moisture content of the air inlet mouth of the drying chamber.
In one embodiment, the inlet air moisture content of the drying chamber can also be calculated based on a moisture content calculation formula. Wherein the moisture content is calculated by the formula
Wherein: p represents air pressure (Pa), ps represents partial pressure of water vapor (Pa),
relative humidity (%) is indicated.
And S53, acquiring the moisture content of the air outlet mouth of the drying chamber based on the air outlet temperature and the air outlet relative humidity. Wherein din is used for representing the moisture content of the air inlet mouth, and dout is used for representing the moisture content of the air outlet mouth.
In one embodiment, similarly, the outlet moisture content of the drying chamber is obtained based on the psychrometric chart of the humid air, the outlet temperature and the relative humidity of the outlet.
In one embodiment, the outlet moisture content of the drying chamber may also be calculated based on the moisture content calculation formula.
In one embodiment, as shown in fig. 6, the step S300 includes steps S61 to S62, wherein:
step S61, determining whether the moisture content variation is greater than a preset first humidity threshold, and obtaining a first determination result.
And S62, acquiring the maximum operating frequency of the compressor, and determining the current operating frequency of the compressor based on the first judgment result and the maximum operating frequency.
D can be used to represent the moisture content variation, D1 can be used to represent the first humidity threshold, f max Representing the maximum operation frequency and f representing the current operation frequency, wherein D = dout-din, din represents the moisture content of the air inlet mouth, and dout represents the moisture content of the air outlet mouth.
In one embodiment, as shown in fig. 7, the step S62 includes steps S71 to S72, wherein:
and step S71, determining the current operating frequency of the compressor as the maximum operating frequency under the condition that the moisture content variation is larger than the first humidity threshold value.
It should be noted that, in the case that the moisture content variation D is larger than the first humidity threshold value D1, i.e. D > D1, it indicates that there is a large amount of moisture in the drying object and that pressure is requiredThe compressor is maintained at a maximum operating frequency f = f max Drying the dried object.
And step S72, determining the current operation frequency of the compressor based on the moisture content variation, the preset second humidity threshold and the maximum operation frequency under the condition that the moisture content variation is less than or equal to the first humidity threshold.
In the embodiment, whether the moisture content variation is larger than the first humidity threshold is judged to determine whether the dried object contains a large amount of moisture, and in the case that the moisture content variation is larger than the first humidity threshold, that is, in the case that the dried object contains a large amount of moisture, the maximum operation frequency of the compressor is controlled to operate, so that the dried object is continuously and rapidly dried, and the drying efficiency of the heat pump dryer is improved.
In one embodiment, as shown in fig. 8, the step S72 further includes a step S81 to a step S83, wherein:
step S81, it is determined whether the moisture content variation is greater than a second humidity threshold, which is smaller than the first humidity threshold.
And step S82, updating the current operation frequency of the compressor based on the preset frequency decrement parameter and the maximum operation frequency under the condition that the moisture content variation is larger than the second humidity threshold.
And S83, controlling the compressor to stop running under the condition that the moisture content variation is less than or equal to the second humidity threshold value.
D2 may be adopted to represent the second humidity threshold, and in the case that the moisture content variation D is smaller than or equal to the second humidity threshold D2, i.e. D ≦ D2, it indicates that the drying object is substantially dried, and the heating may be stopped, and the compressor is controlled to stop operating.
In the above embodiment, whether the moisture content variation is greater than the second humidity threshold is determined to determine whether the object to be dried is substantially dried, and the compressor is controlled to stop operating when the moisture content variation is less than or equal to the second humidity threshold, that is, when the object to be dried is substantially dried, so as to avoid the problem of energy waste caused by the continuous operation of the heat pump dryer when the object to be dried is substantially dried, and to reduce the energy consumption of the heat pump dryer and improve the energy saving performance of the heat pump dryer without affecting the drying effect.
In one embodiment, as shown in fig. 9, the step S82 further includes a step S91 to a step S95, wherein:
step S91, determining a new current operation frequency based on the current operation frequency and the frequency decrement parameter, and taking the new current operation frequency as the current operation frequency of the compressor.
Wherein, may be used 0 Representing a frequency decreasing parameter, the new current operating frequency may be represented as f = f-f 0 . Further, a frequency decrement parameter f is set 0 Is 1, 2 or 3. Optionally, a frequency decrement parameter f is set 0 Is 2.
And step S92, acquiring the current waiting time length, and judging whether the current waiting time length is greater than the preset single frequency control time length.
And step S93, acquiring the moisture content variable quantity between the air outlet and the air inlet of the drying chamber under the condition that the current waiting time is longer than the single frequency control time.
Step S94, determining a preset operation frequency threshold based on the maximum operation frequency and the preset threshold coefficient, and determining whether the moisture content variation is greater than the second humidity threshold.
Wherein the preset threshold coefficient can be represented by b and f b Representing a predetermined operating frequency threshold, the predetermined operating frequency threshold may be represented as f b ＝b*f max 。
Further, the preset threshold coefficient b is set to 0.4, 0.5, or 0.6. Optionally, the preset threshold coefficient b is set to 0.5. Further, the single frequency control period is set to 1 minute, 50 seconds, or 55 seconds. Alternatively, the single frequency control period is 1 minute.
And step S95, under the condition that the moisture content variation is larger than the second humidity threshold, repeatedly executing the steps until the current operation frequency of the compressor reaches a preset operation frequency threshold.
Specifically, when the moisture content variation is less than or equal to the first humidityThe threshold value and the moisture content variation is larger than the second humidity threshold value, i.e. D2 < D ≦ D1, indicates that the moisture content in the drying object is gradually decreasing, therefore, the current operation frequency f = f-f of the compressor needs to be gradually decreased 0 And judging whether the moisture content variation between the air inlet and the air outlet of the drying chamber is larger than a second humidity threshold value again every other single frequency control time length, and repeatedly executing the steps S91 to S95 under the condition that the moisture content variation is larger than the second humidity threshold value until the current operation frequency of the compressor reaches a preset operation frequency threshold value.
Further, under the condition that the current operation frequency of the compressor reaches the preset operation frequency threshold, the current operation frequency of the compressor is not reduced any more, and the compressor is controlled to continue to operate based on the preset operation frequency threshold, so that the drying efficiency and the drying effect of the heat pump dryer are prevented from being influenced by the fact that the current operation frequency of the compressor is reduced continuously, and the compressor is controlled to stop operating until the moisture content variation between the air inlet and the air outlet of the drying chamber is smaller than the second humidity threshold.
In the above steps S91 to S95, when the moisture content variation is smaller than or equal to the first humidity threshold and the moisture content variation is larger than the second humidity threshold, that is, the moisture in the object to be dried is gradually reduced, the current operating frequency of the compressor is gradually reduced based on the frequency decreasing parameter, so that the current operating frequency of the compressor corresponds to the moisture in the object to be dried, thereby gradually reducing the energy consumption of the heat pump dryer without affecting the drying efficiency and the drying effect, and further improving the energy saving performance of the heat pump dryer.
In addition, whether the moisture content variation between the air inlet and the air outlet of the drying chamber is larger than the second humidity threshold value or not is judged again through controlling the time length every other single frequency, so that the compressor is controlled to stop running in time under the condition that the moisture content variation is smaller than the second humidity threshold value, the problem of energy waste caused by continuous running of the heat pump dryer under the condition that the dried object is basically dried is solved, the energy consumption of the heat pump dryer is reduced under the condition that the drying effect is not influenced, and the energy saving performance of the heat pump dryer is further improved.
The following provides an embodiment to further explain the control method of the heat pump dryer provided by the present invention. The heat pump dryer control method provided in this specific embodiment specifically includes the following steps:
step 1: acquiring an air inlet buccal moisture din and an air outlet buccal moisture dout of a drying chamber in a heat pump dryer; moisture content variable quantity D = dout-din between an air inlet and an air outlet of the drying chamber is obtained based on the air inlet sucking moisture content and the air outlet sucking moisture content.
Step 2: judging whether the moisture content variation D is larger than a first humidity threshold value D1 or not, and determining the current operation frequency f of the compressor as the maximum operation frequency f under the condition that the moisture content variation D is larger than the first humidity threshold value D1 max 。
And step 3: in the case where the moisture content variation amount is less than or equal to the first humidity threshold value, it is determined whether the moisture content variation amount D is greater than a second humidity threshold value D2, the second humidity threshold value D2 being less than the first humidity threshold value D1. And controlling the compressor to stop running under the condition that the moisture content variation D is less than or equal to the second humidity threshold value D2.
And 4, step 4: in the case where the moisture content variation D is greater than the second humidity threshold value D2, the current operation frequency f and the frequency decrement parameter f are based 0 Determining a new current operating frequency f = f-f 0 And the new current operating frequency f = f-f 0 As the current operating frequency f of the compressor.
And 5: and acquiring the current waiting time length, and judging whether the current waiting time length is greater than the preset single frequency control time length. And under the condition that the current waiting time is longer than the single frequency control time, acquiring the moisture content variation D between the air outlet and the air inlet of the drying chamber, and judging whether the moisture content variation D is larger than a second humidity threshold D2.
Step 6: in the case that the moisture content variation D is greater than the second humidity threshold value D2, the above steps 4 to 5 are repeatedly performed until the current operation frequency f of the compressor reaches the preset operation frequency threshold value f b ＝b*f max Wherein b represents a preset thresholdCoefficient of value, f max Representing the maximum operating frequency.
The heat pump dryer control apparatus provided by the present invention is described below, and the heat pump dryer control apparatus described below and the heat pump dryer control method described above may be referred to in correspondence with each other.
As shown in fig. 10, the present invention provides a heat pump dryer control apparatus, and a heat pump dryer control apparatus 1000 includes:
the first obtaining module 1010 is used for obtaining the moisture content of the air intake mouth and the moisture content of the air outlet mouth of the drying chamber in the heat pump dryer.
And a second obtaining module 1020 for obtaining moisture content variation between the air inlet and the air outlet of the drying chamber based on the air inlet mouth moisture content and the air outlet mouth moisture content.
And an operation control module 1030 for adjusting a current operation frequency of the compressor in the heat pump dryer based on the moisture content variation to control the operation rate of the compressor based on the current operation frequency.
In one embodiment, the first obtaining module 1010 includes a data acquisition unit, a first computing unit, and a second computing unit, wherein:
and the data acquisition unit is used for acquiring the air inlet temperature, the air inlet relative humidity, the air outlet temperature and the air outlet relative humidity of the drying chamber.
And the first calculating unit is used for acquiring the air inlet buccal moisture content of the drying chamber based on the air inlet temperature and the air inlet relative humidity. And the second calculation unit is used for acquiring the air outlet buccal moisture content of the drying chamber based on the air outlet temperature and the air outlet relative humidity.
In one embodiment, the operation control module 1030 includes a threshold determination unit and a frequency determination unit, wherein:
the first judging unit is used for judging whether the moisture content variation is larger than a preset first humidity threshold value or not to obtain a first judging result.
And a frequency determining unit for acquiring a maximum operating frequency of the compressor and determining a current operating frequency of the compressor based on the first judgment result and the maximum operating frequency.
In one embodiment, the frequency determination unit comprises a first determination subunit and a second determination subunit, wherein:
and a first determining sub-unit for determining the current operating frequency of the compressor as the maximum operating frequency in the case that the moisture content variation is greater than the first humidity threshold.
And a second determining sub-unit for determining the current operating frequency of the compressor based on the moisture content variation, a preset second humidity threshold and the maximum operating frequency in case the moisture content variation is less than or equal to the first humidity threshold.
In one embodiment, the second determining subunit is further configured to determine whether the moisture content variation is greater than a second humidity threshold, the second humidity threshold being less than the first humidity threshold; updating the current operating frequency of the compressor based on a preset frequency decreasing parameter and the maximum operating frequency under the condition that the moisture content variation is larger than a second humidity threshold; and controlling the compressor to stop running under the condition that the moisture content variation is less than or equal to the second humidity threshold value.
In one embodiment, the second determining subunit is further configured to determine a new current operating frequency based on the current operating frequency and the frequency decrement parameter, and to use the new current operating frequency as the current operating frequency of the compressor; acquiring the current waiting time length, and judging whether the current waiting time length is greater than the preset single frequency control time length or not; under the condition that the current waiting time length is longer than the single frequency control time length, acquiring the moisture content variation between an air outlet and an air inlet of the drying chamber; determining a preset operation frequency threshold value based on the maximum operation frequency and a preset threshold value coefficient, and judging whether the moisture content variation is larger than a second humidity threshold value; and under the condition that the moisture content variation is larger than the second humidity threshold value, the steps are repeatedly executed until the current operation frequency of the compressor reaches the preset operation frequency threshold value.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being stored on a non-transitory computer readable storage medium, the computer program being capable of executing, when executed by a processor, a heat pump dryer control method provided by the above methods, the method including: acquiring an air inlet buccal moisture content and an air outlet buccal moisture content of a drying chamber in a heat pump dryer; acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the air inlet moisture content and the air outlet moisture content; and adjusting the current operation frequency of the compressor in the heat pump dryer based on the moisture content variation to control the operation of the compressor based on the current operation frequency.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements a heat pump dryer control method provided by each of the above methods, the method including: acquiring an air inlet buccal moisture content and an air outlet buccal moisture content of a drying chamber in a heat pump dryer; acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the air inlet moisture content and the air outlet moisture content; adjusting a current operating frequency of a compressor in the heat pump dryer based on the moisture content variation amount to control an operation of the compressor based on the current operating frequency.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A heat pump dryer control method is characterized by comprising the following steps:
acquiring an air inlet buccal moisture content and an air outlet buccal moisture content of a drying chamber in the heat pump dryer;
acquiring moisture content variation between an air inlet and an air outlet of the drying chamber based on the air inlet mouth moisture content and the air outlet mouth moisture content;
adjusting a current operating frequency of a compressor in the heat pump dryer based on the moisture content variation amount to control the compressor to operate based on the current operating frequency.
2. The heat pump dryer control method according to claim 1, wherein the obtaining of the moisture content of the inlet air and the moisture content of the outlet air of the drying chamber in the heat pump dryer includes:
acquiring the temperature of an air inlet, the relative humidity of the air inlet, the temperature of an air outlet and the relative humidity of the air outlet of the drying chamber;
acquiring the moisture content of the air intake mouth of the drying chamber based on the temperature of the air inlet and the relative humidity of the air inlet;
and acquiring the moisture content of the air outlet mouth of the drying chamber based on the air outlet temperature and the air outlet relative humidity.
3. The heat pump dryer control method according to claim 1, wherein said adjusting a current operating frequency of a compressor in the heat pump dryer based on the moisture content variation amount comprises:
judging whether the moisture content variation is larger than a preset first humidity threshold value or not to obtain a first judgment result;
and acquiring the maximum operating frequency of the compressor, and determining the current operating frequency of the compressor based on the first judgment result and the maximum operating frequency.
4. The heat pump dryer control method according to claim 3, wherein said determining a current operating frequency of a compressor based on the first determination result and the maximum operating frequency includes:
determining a current operating frequency of the compressor as the maximum operating frequency in the case that the moisture content variation is greater than the first humidity threshold;
and determining the current operating frequency of the compressor based on the moisture content variation, a preset second humidity threshold and the maximum operating frequency under the condition that the moisture content variation is smaller than or equal to the first humidity threshold.
5. The heat pump dryer control method of claim 4, wherein said determining a current operating frequency of the compressor based on the moisture content variation, a preset second humidity threshold and the maximum operating frequency comprises:
judging whether the moisture content variation is larger than a second humidity threshold value, wherein the second humidity threshold value is smaller than the first humidity threshold value;
updating the current operating frequency of the compressor based on a preset frequency decreasing parameter and the maximum operating frequency in case the moisture content variation is greater than the second humidity threshold;
and controlling the compressor to stop running under the condition that the moisture content variation is less than or equal to the second humidity threshold value.
6. The heat pump dryer control method of claim 5, wherein said updating the current operating frequency of the compressor based on a preset frequency decrement parameter and the maximum operating frequency comprises:
determining a new current operating frequency based on the current operating frequency and the frequency decrement parameter, and taking the new current operating frequency as the current operating frequency of the compressor;
acquiring current waiting time length, and judging whether the current waiting time length is greater than preset single frequency control time length or not;
acquiring the moisture content variation between the air outlet and the air inlet of the drying chamber under the condition that the current waiting time is longer than the single frequency control time;
determining a preset operation frequency threshold value based on the maximum operation frequency and a preset threshold value coefficient, and judging whether the moisture content variation is larger than the second humidity threshold value;
and under the condition that the moisture content variation is larger than the second humidity threshold, repeatedly executing the steps until the current operation frequency of the compressor reaches the preset operation frequency threshold.
7. A heat pump dryer control apparatus, characterized by comprising:
the first acquisition module is used for acquiring the moisture content of an air inlet mouth and the moisture content of an air outlet mouth of a drying chamber in the heat pump dryer;
the second acquisition module is used for acquiring moisture content variation between the air inlet and the air outlet of the drying chamber based on the air inlet mouth moisture content and the air outlet mouth moisture content;
and the operation control module is used for adjusting the current operation frequency of a compressor in the heat pump dryer based on the moisture content variation so as to control the operation rate of the compressor based on the current operation frequency.
8. A heat pump dryer is characterized by comprising an evaporator, a compressor, a condenser, a dehumidifier, an electric heater, a first expansion valve and a second expansion valve; the compressor, the condenser, the first expansion valve and the dehumidifier are sequentially connected to form a dehumidification thermodynamic loop, and the evaporator, the compressor, the condenser and the second expansion valve are sequentially connected to form a drying thermodynamic loop; the electric heater is arranged between the condenser and an air inlet of a drying chamber of the heat pump dryer;
further comprising: the system comprises a first temperature sensor, a first humidity sensor, a second temperature sensor, a second humidity sensor and a controller; the first temperature sensor and the first humidity sensor are arranged at an air inlet of the drying chamber, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of the air inlet and the relative humidity of the air inlet; the second temperature sensor and the second humidity sensor are arranged at an air outlet of the drying chamber, are respectively and electrically connected with the controller and are respectively used for collecting the temperature of an air outlet and the relative humidity of the air outlet;
the controller includes a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the heat pump dryer control method of any one of claims 1 to 6 when executing the program.
9. A non-transitory computer readable storage medium on which a computer program is stored, wherein the computer program, when executed by a processor, implements the heat pump dryer control method according to any one of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the heat pump dryer control method according to any one of claims 1 to 6.
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