CN115978976A - Method and device for controlling heat pump drying equipment, heat pump drying equipment and storage medium - Google Patents

Abstract

The application relates to the technical field of drying equipment, and discloses a method for controlling heat pump drying equipment, wherein the heat pump drying equipment comprises a compressor, and the compressor is used for performing cold medium mass circulation of the heat pump drying equipment; the method comprises the following steps: monitoring the humidity of an air outlet of the drying room in real time; under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency. Can know the stoving state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material. The application also discloses a device for controlling the heat pump drying equipment, the heat pump drying equipment and a storage medium.

Description

Method and device for controlling heat pump drying equipment, heat pump drying equipment and storage medium

Technical Field

The present application relates to the technical field of drying equipment, and for example, to a method and an apparatus for controlling a heat pump drying equipment, and a storage medium.

Background

At present, in the process of drying materials in a drying room through a heat pump drying system, in the prior art, a technician usually controls the operation of a heat pump drying device according to the baking temperature collected by a temperature sensor.

In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

because the baking temperature and the real temperature which are collected by the temperature sensor have deviation, the drying control of the materials is not accurate enough.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a method and a device for controlling a heat pump drying device, the heat pump drying device and a storage medium, so that the drying control of materials is more accurate.

In some embodiments, the heat pump drying apparatus includes a compressor for performing a refrigerant medium circulation of the heat pump drying apparatus; the method comprises the following steps: monitoring the humidity of an air outlet of the drying room in real time; under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of an air outlet of the drying room at least twice; respectively acquiring errors between the temperature values and preset temperature values; acquiring a temperature error change value according to each error; acquiring the frequency to be operated of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency.

In some embodiments, the heat pump drying device comprises a compressor for performing a cold medium circulation of the heat pump drying device; the device comprises: the monitoring module is configured to monitor the humidity of the air outlet of the drying room in real time; the first acquisition module is configured to acquire a temperature value of the drying room air outlet at least twice under the condition that the humidity is greater than a first preset threshold value; the second acquisition module is configured to respectively acquire errors between the temperature values and preset temperature values; a third obtaining module configured to obtain a temperature error change value according to each error; the fourth acquisition module is configured to acquire the to-be-operated frequency of the compressor according to the temperature error change value; a control module configured to control the compressor to operate at the to-be-operated frequency.

In some embodiments, the apparatus comprises a processor and a memory storing program instructions, the processor being configured to, upon execution of the program instructions, perform the above-described method for controlling a heat pump drying appliance.

In some embodiments, the heat pump drying apparatus includes the above-mentioned device for controlling a heat pump drying apparatus.

In some embodiments, the storage medium stores program instructions that, when executed, perform the above-described method for controlling a heat pump drying apparatus.

The method and the device for controlling the heat pump drying equipment, the heat pump drying equipment and the storage medium provided by the embodiment of the disclosure can realize the following technical effects: monitoring the humidity of an air outlet of the drying room in real time; acquiring temperature values of the air outlet of the drying room at least twice under the condition that the humidity is greater than a first preset threshold value; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency. Can know the stoving state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings and not in a limiting sense, in which elements having the same reference numeral designations represent like elements, and in which:

fig. 1 (a) is a schematic structural diagram of a heat pump drying apparatus provided in an embodiment of the present disclosure;

fig. 1 (b) is a schematic block circuit diagram of a heat pump drying apparatus provided in an embodiment of the present disclosure;

fig. 2 is a schematic diagram of a method for controlling a heat pump drying apparatus according to an embodiment of the present disclosure;

fig. 3 is a schematic diagram of another method for controlling a heat pump drying apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram of another method for controlling a heat pump drying apparatus according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of another method for controlling a heat pump drying apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic diagram of another method for controlling a heat pump drying apparatus according to an embodiment of the present disclosure;

fig. 7 is a schematic diagram of an apparatus for controlling a heat pump drying device according to an embodiment of the present disclosure;

fig. 8 is a schematic diagram of another apparatus for controlling a heat pump drying device according to an embodiment of the present disclosure.

Reference numerals are as follows: 1. a compressor; 2. an evaporator; 3. an expansion valve; 4. a condenser; 5. a humidity sensor; 6. a control unit; 7. a temperature sensor.

Detailed Description

So that the manner in which the features and advantages of the embodiments of the present disclosure can be understood in detail, a more particular description of the embodiments of the disclosure, briefly summarized above, may be had by reference to the appended drawings, which are included to illustrate, but are not intended to limit the embodiments of the disclosure. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged as appropriate for the embodiments of the disclosure described herein. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

The term "plurality" means two or more unless otherwise specified.

In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.

The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.

The term "correspond" may refer to an association or binding relationship, and a corresponding to B refers to an association or binding relationship between a and B.

As shown in fig. 1 (a) and 1 (b), the heat pump drying apparatus includes a compressor 1, an evaporator 2, an expansion valve 3, a condenser 4, a humidity sensor 5, a control unit 6, and a temperature sensor 7; the heat pump drying equipment is used for drying materials in a drying room, the compressor 1 is used for performing cold medium mass circulation of the heat pump drying equipment, the evaporator 2 is used for dehumidifying return air of the drying room, the expansion valve 3 is used for adjusting the cold medium mass circulation of the heat pump drying equipment, and the condenser 4 is used for heating air. The humidity sensor 5 is electrically connected with the control unit 6, the temperature sensor 7 is electrically connected with the control unit 6, the compressor 1 is electrically connected with the control unit 6, and the expansion valve 3 is electrically connected with the control unit 6; the humidity sensor 5 is arranged at the air outlet of the drying room and used for monitoring the humidity of the air outlet of the drying room and sending the monitored humidity of the air outlet of the drying room to the control unit 6; the temperature sensor 7 is arranged at the air outlet of the drying room and used for acquiring temperature values of the air outlet of the drying room at least twice and sending the acquired temperature values to the control unit 6; the control unit 6 is used for receiving the humidity of the air outlet of the drying room sent by the humidity sensor 5, and triggering the temperature sensor 7 to acquire the temperature of the air outlet of the drying room and receive the temperature values of the air outlet of the drying room sent by the temperature sensor 7 at least twice under the condition that the humidity is greater than a first preset threshold value; the control unit 6 is used for acquiring the frequency to be operated of the compressor 1, sending a control signal to the compressor 1 and triggering the compressor 1 to operate according to the frequency to be operated; the control unit 6 is adapted to controlling the opening of the expansion valve 3.

Referring to fig. 2, an embodiment of the present disclosure provides a method for controlling a heat pump drying apparatus, including:

step S201, monitoring the humidity of an air outlet of a drying room in real time;

step S202, under the condition that the humidity is larger than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice;

step S203, respectively obtaining errors between each temperature value and a preset temperature value;

step S204, acquiring a temperature error change value according to each error;

step S205, acquiring the frequency to be operated of the compressor according to the temperature error change value;

and step S206, controlling the compressor to run according to the to-be-run frequency.

By adopting the method for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the humidity of the air outlet of the drying room is monitored in real time; acquiring temperature values of the air outlet of the drying room at least twice under the condition that the humidity is greater than a first preset threshold value; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the frequency to be operated of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency. Can know the baking state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material.

In some embodiments, the control unit sends a first start signal to the humidity sensor, the humidity sensor monitors the humidity of the air outlet of the drying room in real time when receiving the first start signal and feeds the monitored humidity back to the control unit, the control unit receives the humidity fed back by the humidity sensor and sends a second start signal to the temperature sensor when the humidity is greater than a first preset threshold value, the temperature sensor obtains temperature values of the air outlet of the drying room at least twice and feeds the temperature values back to the control unit when receiving a second start signal sent by the control unit, and the control unit receives the temperature values fed back by the temperature sensor and respectively obtains errors between the temperature values and preset temperature values; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; sending a control signal including a frequency to be operated to the compressor; the compressor runs according to the frequency to be run under the condition of receiving the control signal sent by the control unit.

Optionally, the heat pump drying device is used for drying tobacco leaves.

Optionally, the first predetermined threshold is 30%, so that in the case that the humidity is greater than 30%, it is indicated that the moisture content in the material does not reach the standard, and the material needs to be baked.

Optionally, obtaining a temperature error change value according to each error includes: and subtracting the errors of two adjacent times to obtain a temperature error change value.

Optionally, obtaining the to-be-operated frequency of the compressor according to the temperature error variation value includes: calculating by using a preset algorithm through the temperature error change value to obtain a target temperature value; acquiring the frequency to be adjusted of the compressor according to the target temperature value; and acquiring the frequency to be operated of the compressor according to the frequency to be adjusted.

Optionally, the obtaining the target temperature value by calculating with a preset algorithm using the temperature error variation value includes: and obtaining a target temperature value by calculating T = kp pn + ki dn, wherein T is the target temperature value, kp is a first preset coefficient, ki is a second preset coefficient, pn is an error, and dn is a temperature error change value.

Optionally, obtaining the frequency to be adjusted of the compressor according to the target temperature value includes: matching an adjusting frequency corresponding to the target temperature value in a preset data table, wherein the corresponding relation between the target temperature value and the adjusting frequency is stored in the data table; and determining the adjusting frequency as the frequency to be adjusted of the compressor.

Optionally, obtaining the to-be-operated frequency of the compressor according to the to-be-adjusted frequency includes: acquiring the current operating frequency of the compressor; and summing the current operating frequency and the frequency to be adjusted to obtain the frequency to be operated.

In some embodiments, the control unit is a PID (proportional integral derivative) controller, and the PID controller matches an adjustment frequency corresponding to the target temperature value in a preset data table; acquiring the current operating frequency of the compressor; and summing the current operating frequency and the frequency to be adjusted to obtain the frequency to be operated.

With reference to fig. 3, another method for controlling a heat pump drying apparatus is provided in an embodiment of the present disclosure, including:

step S301, monitoring the humidity of an air outlet of a drying room in real time;

step S302, under the condition that the humidity is larger than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice;

step S303, respectively obtaining errors between each temperature value and a preset temperature value;

step S304, acquiring a temperature error change value according to each error;

step S305, acquiring the frequency to be operated of the compressor according to the temperature error change value;

step S306, controlling the compressor to run according to the to-be-run frequency;

and step S307, under the condition that the humidity is greater than a second preset threshold, increasing the operating frequency of the compressor until the humidity is less than or equal to the second preset threshold.

By adopting the method for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the humidity of the air outlet of the drying room is monitored in real time; under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; controlling the compressor to operate according to the to-be-operated frequency; and under the condition that the humidity is greater than a second preset threshold value, increasing the operating frequency of the compressor until the humidity is less than or equal to the second preset threshold value. Can know the stoving state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material. And under the condition that humidity is greater than the second preset threshold value, the temperature of the air inlet of the baking room can be improved by improving the operating frequency of the compressor, so that the drying speed of the materials is accelerated.

Optionally, the second preset threshold is 85%, and in the case that the humidity is greater than 85%, it is characterized that the material contains a large amount of moisture.

Optionally, the heat pump drying apparatus further comprises an electric heater for heating air of the drying room air inlet.

With reference to fig. 4, another method for controlling a heat pump drying apparatus is provided in an embodiment of the present disclosure, including:

step S401, monitoring the humidity of an air outlet of a drying room in real time;

step S402, under the condition that the humidity is larger than a first preset threshold value, obtaining temperature values of air outlets of the drying room at least twice;

step S403, respectively obtaining errors between each temperature value and a preset temperature value;

step S404, acquiring a temperature error change value according to each error;

step S405, acquiring the frequency to be operated of the compressor according to the temperature error change value;

step S406, controlling the compressor to operate according to the to-be-operated frequency;

step S407, triggering the electric heater to be started under the condition that the humidity is greater than a second preset threshold and the running frequency of the compressor reaches a rated frequency.

By adopting the method for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the baking state of the material in the drying room can be known through humidity, and the operation frequency of the compressor is controlled through the temperature error change value, so that the drying control on the material is more accurate, the baking quality of the material can be improved, and the electric heater can be started to improve the temperature of the drying room under the condition that the heat provided by the compressor is insufficient.

With reference to fig. 5, another method for controlling a heat pump drying apparatus is provided in an embodiment of the present disclosure, including:

step S501, monitoring the humidity of an air outlet of a drying room in real time;

step S502, under the condition that the humidity is larger than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice;

step S503, respectively obtaining the error between each temperature value and the preset temperature value;

step S504, obtaining a temperature error change value according to each error;

step S505, acquiring the frequency to be operated of the compressor according to the temperature error change value;

step S506, controlling the compressor to run according to the to-be-run frequency;

step S507, triggering the electric heater to be started under the condition that the humidity is greater than a second preset threshold value and the running frequency of the compressor reaches a rated frequency;

and step S508, reducing the power of the electric heater or turning off the electric heater under the condition that the humidity is in the preset range.

By adopting the method for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the baking state of the material in the drying room can be known through the humidity of the air outlet, and the operation frequency of the compressor is controlled through the temperature error change value, so that the drying control of the material is more accurate, the baking quality of the material can be improved, and meanwhile, the temperature of the drying room can be improved by starting the electric heater under the condition that the heat provided by the compressor is insufficient; and under the condition that the humidity is in the preset range, the power of the electric heater is reduced or the electric heater is turned off, so that the heating energy consumption is saved.

Optionally, the preset range is 30% to 85%.

With reference to fig. 6, another method for controlling a heat pump drying apparatus is provided in an embodiment of the present disclosure, including:

step S601, monitoring the humidity of an air outlet of the drying room in real time;

and step S602, controlling the running frequency of the compressor to be 0 under the condition that the humidity is less than or equal to a first preset threshold value.

By adopting the method for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the moisture content of the material can be determined to reach the standard without baking under the condition that the humidity is less than or equal to the first preset threshold value.

With reference to fig. 7, an apparatus for controlling a heat pump drying device according to an embodiment of the present disclosure includes a monitoring module 701, a first obtaining module 702, a second obtaining module 703, a third obtaining module 704, a fourth obtaining module 705, and a control module 706; the monitoring module 701 is configured to monitor the humidity of the drying room air outlet in real time; the first obtaining module 702 is configured to obtain the temperature value of the air outlet of the drying room at least twice when the humidity is greater than a first preset threshold; the second obtaining module 703 is configured to obtain errors between each temperature value and a preset temperature value respectively; the third obtaining module 704 is configured to obtain a temperature error change value according to each error; the fourth obtaining module 705 is configured to obtain the to-be-operated frequency of the compressor according to the temperature error variation value; the control module 706 is configured to control the compressor to operate at the frequency to be operated.

By adopting the device for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the humidity of the air outlet of the drying room is monitored in real time through the monitoring module; the first acquisition module acquires temperature values of the air outlet of the drying room at least twice under the condition that the humidity is greater than a first preset threshold value; the second acquisition module respectively acquires errors between each temperature value and a preset temperature value; the third acquisition module acquires a temperature error change value according to each error; the fourth acquisition module acquires the to-be-operated frequency of the compressor according to the temperature error change value; the control module controls the compressor to operate according to the to-be-operated frequency. Can know the stoving state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material.

Optionally, the third obtaining module is configured to obtain the temperature error variation value according to each error by: and subtracting the errors of two adjacent times to obtain a temperature error change value.

Optionally, the fourth obtaining module is configured to obtain the to-be-operated frequency of the compressor according to the temperature error variation value by: calculating by using a preset algorithm through the temperature error change value to obtain a target temperature value; acquiring the frequency to be adjusted of the compressor according to the target temperature value; and acquiring the to-be-operated frequency of the compressor according to the to-be-adjusted frequency.

Optionally, obtaining the frequency to be adjusted of the compressor according to the target temperature value includes: matching an adjusting frequency corresponding to the target temperature value in a preset data table, and storing a corresponding relation between the target temperature value and the adjusting frequency in the data table; the adjustment frequency is determined as the frequency to be adjusted of the compressor.

Optionally, obtaining the to-be-operated frequency of the compressor according to the to-be-adjusted frequency includes: acquiring the current operating frequency of the compressor; and summing the current operating frequency and the frequency to be adjusted to obtain the frequency to be operated.

Optionally, the apparatus for controlling a heat pump drying device further comprises an increasing module configured to increase the operating frequency of the compressor until the humidity is less than or equal to a second preset threshold value, in case the humidity is greater than the second preset threshold value.

Optionally, the apparatus for controlling a heat pump drying device further includes a triggering module configured to trigger the electric heater to be turned on when the humidity is greater than a second preset threshold and the operating frequency of the compressor reaches a rated frequency.

Optionally, the apparatus for controlling a heat pump drying device further includes a reducing module configured to reduce power of the electric heater or turn off the electric heater in a case where the humidity is in a preset range after triggering the electric heater to turn on.

Optionally, the control module is further configured to control the operating frequency of the compressor to be 0 in case the humidity is less than or equal to a first preset threshold.

As shown in fig. 8, an embodiment of the present disclosure provides an apparatus for controlling a heat pump drying device, including a processor (processor) 800 and a memory (memory) 801. Optionally, the apparatus may also include a Communication Interface 802 and a bus 803. The processor 800, the communication interface 802, and the memory 801 may communicate with each other via a bus 803. Communication interface 802 may be used for information transfer. The processor 800 may call logic instructions in the memory 801 to perform the method for controlling the heat pump drying apparatus of the above-described embodiment.

By adopting the device for controlling the heat pump drying equipment provided by the embodiment of the disclosure, the humidity of the air outlet of the drying room is monitored in real time; under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency. Can know the stoving state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material.

In addition, the logic instructions in the memory 801 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 a stand-alone product.

The memory 801 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 800 executes functional applications and data processing, i.e., implements the method for controlling the heat pump drying apparatus in the above-described embodiment, by executing program instructions/modules stored in the memory 801.

The memory 801 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. In addition, the memory 801 may include a high-speed random access memory, and may also include a nonvolatile memory.

The embodiment of the disclosure provides a heat pump drying device, which comprises the device for controlling the heat pump drying device.

By adopting the heat pump drying equipment provided by the embodiment of the disclosure, the humidity of the air outlet of the drying room is monitored in real time; under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of air outlets of the drying room at least twice; respectively acquiring errors between each temperature value and a preset temperature value; acquiring a temperature error change value according to each error; acquiring the to-be-operated frequency of the compressor according to the temperature error change value; and controlling the compressor to operate according to the to-be-operated frequency. Can know the baking state of material in the baking house through humidity like this to through the operating frequency of temperature error variation value control compressor, make the stoving control to the material more accurate, thereby can promote the quality of toasting of material.

The disclosed embodiments provide a storage medium storing program instructions that, when executed, perform the above-described method for controlling a heat pump drying apparatus.

The disclosed embodiments provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the above-described method for controlling a heat pump drying apparatus.

The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, where the computer software product is stored in a storage medium and includes one or more instructions to enable 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 of the embodiments of the present disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: 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 other various media capable of storing program codes, and may also be a transient storage medium.

The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. Furthermore, the words used in the specification are words of description only and are not intended to limit the claims. As used in the description of the embodiments and the claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Similarly, the term "and/or" as used in this application is meant to encompass any and all possible combinations of one or more of the associated listed. Furthermore, the terms "comprises" and/or "comprising," when used in this application, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Without further limitation, an element defined by the phrase "comprising a …" does not exclude the presence of additional like elements in a process, method, or apparatus that comprises the element. In this document, each embodiment may be described with emphasis on differences from other embodiments, and the same and similar parts between the respective embodiments may be referred to each other. For methods, products, etc. of the embodiment disclosure, reference may be made to the description of the method section for relevance if it corresponds to the method section of the embodiment disclosure.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by the skilled person that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units may be merely a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. In the description corresponding to the flowcharts and block diagrams in the figures, operations or steps corresponding to different blocks may also occur in different orders than disclosed in the description, and sometimes there is no specific order between the different operations or steps. For example, two sequential operations or steps may in fact be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims (13)

1. A method for controlling a heat pump drying apparatus, the heat pump drying apparatus comprising a compressor for performing a cold medium mass circulation of the heat pump drying apparatus; characterized in that the method comprises:

monitoring the humidity of an air outlet of the drying room in real time;

under the condition that the humidity is greater than a first preset threshold value, acquiring temperature values of an air outlet of the drying room at least twice;

respectively acquiring errors between the temperature values and preset temperature values;

acquiring a temperature error change value according to each error;

acquiring the frequency to be operated of the compressor according to the temperature error change value;

and controlling the compressor to operate according to the to-be-operated frequency.

2. The method of claim 1, wherein obtaining a temperature error change value from each error comprises:

and subtracting the errors of two adjacent times to obtain the temperature error change value.

3. The method of claim 1, wherein obtaining the to-be-operated frequency of the compressor according to the temperature error variation value comprises:

calculating by using the temperature error change value through a preset algorithm to obtain a target temperature value;

acquiring the frequency to be adjusted of the compressor according to the target temperature value;

and acquiring the frequency to be operated of the compressor according to the frequency to be adjusted.

4. The method of claim 3, wherein obtaining the frequency to be adjusted of the compressor from the target temperature value comprises:

matching an adjusting frequency corresponding to the target temperature value in a preset data table, wherein the corresponding relation between the target temperature value and the adjusting frequency is stored in the data table;

and determining the adjusting frequency as the frequency to be adjusted of the compressor.

5. The method of claim 3, obtaining the to-be-operated frequency of the compressor according to the to-be-adjusted frequency, comprising:

acquiring the current operating frequency of the compressor;

and summing the current operating frequency and the frequency to be adjusted to obtain the frequency to be operated.

6. The method as claimed in any one of claims 1 to 5, wherein after controlling the compressor to operate at the to-be-operated frequency, further comprising:

and under the condition that the humidity is greater than a second preset threshold value, increasing the operating frequency of the compressor until the humidity is less than or equal to the second preset threshold value.

7. The method of any of claims 1 to 5, wherein the heat pump drying apparatus further comprises an electric heater for heating air of the drying room air inlet; after controlling the compressor to operate according to the to-be-operated frequency, the method further comprises the following steps:

and triggering the electric heater to be started under the condition that the humidity is greater than a second preset threshold and the running frequency of the compressor reaches a rated frequency.

8. The method of claim 7, wherein after triggering the electric heater to turn on, further comprising:

and reducing the power of the electric heater or turning off the electric heater under the condition that the humidity is in a preset range.

9. The method of any one of claims 1 to 5, wherein after monitoring the humidity at the drying room air outlet in real time, the method further comprises:

and controlling the running frequency of the compressor to be 0 under the condition that the humidity is less than or equal to the first preset threshold value.

10. A device for controlling a heat pump drying device comprises a compressor, wherein the compressor is used for performing cold medium mass circulation of the heat pump drying device; characterized in that the device comprises:

the monitoring module is configured to monitor the humidity of the air outlet of the drying room in real time;

the first acquisition module is configured to acquire the temperature value of the drying room air outlet at least twice under the condition that the humidity is greater than a first preset threshold value;

the second acquisition module is configured to respectively acquire errors between the temperature values and preset temperature values;

a third obtaining module configured to obtain a temperature error change value according to each error;

the fourth acquisition module is configured to acquire the to-be-operated frequency of the compressor according to the temperature error change value;

a control module configured to control the compressor to operate at the to-be-operated frequency.

11. An apparatus for controlling a heat pump drying appliance, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to carry out the method for controlling a heat pump drying appliance according to any one of claims 1 to 9 when executing the program instructions.

12. A heat pump drying apparatus, characterized by comprising the device for controlling a heat pump drying apparatus according to claim 11.

13. A storage medium storing program instructions, characterized in that, when running, the program instructions perform the method for controlling a heat pump drying apparatus according to any one of claims 1 to 9.

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