CN115355699A - Method and device for controlling heat pump drying system and heat pump drying system - Google Patents

Abstract

The application relates to the technical field of drying, and discloses a method for controlling a heat pump drying system, wherein a refrigerant circulation loop of the heat pump drying system comprises a first indoor heat exchanger and a second indoor heat exchanger; the two indoor heat exchangers are connected in series and are both condensers in a heating mode; the method comprises the following steps: detecting the indoor temperature of a drying room under the condition that the heat pump drying system operates in a heating mode; controlling the heat pump drying system to operate in an energy-saving mode under the condition that the indoor temperature meets a preset condition; the energy-saving mode refers to that only one condenser works in a heating mode. The method controls a condenser to work under the condition of meeting the indoor temperature requirement. Therefore, the indoor temperature can be maintained, and the energy saving is facilitated. The application also discloses a device for controlling the heat pump drying system, the heat pump drying system and a storage medium.

Description

Method and device for controlling heat pump drying system and heat pump drying system

Technical Field

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

Background

At present, when drying the material of treating drying in the stoving room, in order to guarantee the stoving effect of treating the material of drying, need carry out the heat supply to the stoving room and handle and improve stoving room temperature. A heat pump drying system is generally adopted for supplying heat, and an electric auxiliary heating device is arranged to maintain the temperature in the drying room together.

The related art discloses an air energy high-temperature dehumidification heat pump tobacco leaf drying system with a cooling device, which comprises an internal circulation heat exchange device, a compressor, an external circulation heat exchange device, a main electronic expansion valve, an injection electronic expansion valve and a gas-liquid separator; a four-way valve and a reversing mechanism are connected between the internal circulation heat exchange device and the external circulation heat exchange device; the four-way valve is also connected with a gas-liquid separator; one end of the compressor is connected with the internal circulation heat exchange device through a pipeline, and the other end of the compressor is connected with the gas-liquid separator; the main electronic expansion valve is arranged on a pipeline between the reversing mechanism and the gas-liquid separator, one end of the injection electronic expansion valve is arranged between the main electronic expansion valve and the gas-liquid separator, and the other end of the injection electronic expansion valve is arranged between the four-way valve and the gas-liquid separator; and a control valve is connected in parallel to a pipeline between the compressor and the four-way valve. The internal circulation heat exchange device comprises an internal heat exchanger and an auxiliary heat exchanger.

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:

in the related art, an auxiliary heat exchanger is added indoors to provide heat energy for a drying room. However, when the temperature in the drying room is high, the heat supply amount cannot be effectively adjusted, and the energy waste is caused.

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 system, the heat pump drying system and a storage medium, so as to effectively adjust the heat supply amount and realize energy conservation.

In some embodiments, the refrigerant circulation loop of the heat pump drying system comprises a first indoor heat exchanger and a second indoor heat exchanger; the two indoor heat exchangers are connected in series and are both condensers in a heating mode; the method comprises the following steps: detecting the indoor temperature of a drying room under the condition that the heat pump drying system operates in a heating mode; controlling the heat pump drying system to operate in an energy-saving mode under the condition that the indoor temperature meets a preset condition; the energy-saving mode refers to that only one condenser works in a heating mode.

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

In some embodiments, the heat pump drying system comprises: the refrigerant circulating loop comprises a first indoor heat exchanger and a second indoor heat exchanger, wherein inlet ends of the first indoor heat exchanger and the second indoor heat exchanger are respectively provided with a first four-way valve and a second four-way valve, and two ports of the first four-way valve are respectively connected with two ports of the second four-way valve; and, an apparatus for controlling a heat pump drying system as aforesaid.

In some embodiments, the storage medium stores program instructions that, when executed, perform a method for controlling a heat pump drying system as previously described.

The method and the device for controlling the heat pump drying system, the heat pump drying system and the storage medium provided by the embodiment of the disclosure can realize the following technical effects:

in the embodiment of the disclosure, when the heat pump drying system is operated in a heating mode to heat materials to be dried, the temperature in the drying room can be detected in real time. When the indoor temperature meets the preset condition, the heat pump drying system can be controlled to operate in an energy-saving mode. Wherein, the energy-saving mode means that only one of the two condensers works. Thus, one condenser is controlled to operate under the condition that the indoor temperature requirement is met. Therefore, the indoor temperature can be maintained, and the energy saving is facilitated.

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 by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:

fig. 1 is a schematic structural diagram of a heat pump drying system according to an embodiment of the present disclosure;

fig. 2 is a schematic refrigerant flow direction diagram of an energy saving mode of operation of the heat pump drying system provided in the embodiment of the present disclosure;

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

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

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

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

Reference numerals are as follows:

10: a compressor; 21: a first indoor heat exchanger; 22: a second indoor heat exchanger; 30: an outdoor heat exchanger; 40: an electronic expansion valve; 51: a first four-way valve; 52: a second four-way valve.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. 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 under appropriate circumstances such that embodiments of the present disclosure described herein may be made. 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. E.g., 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.

Referring to fig. 1, the heat pump drying system includes a refrigerant circulation loop formed by a compressor 10, a four-way valve, an indoor heat exchanger, an electronic expansion valve 40, and an outdoor heat exchanger 30. The indoor heat exchanger includes a first indoor heat exchanger 21 and a second indoor heat exchanger 22. The inlet ends of the first and second indoor heat exchangers are respectively provided with a first four-way valve 51 and a second four-way valve 52, and two ports of the first four-way valve 51 are respectively connected with two ports of the second four-way valve 52. The inlet ends of the first indoor heat exchanger 21 and the second indoor heat exchanger 22 refer to inflow ends of the refrigerant when both the first indoor heat exchanger 21 and the second indoor heat exchanger 22 are condensers.

Specifically, the discharge port of the compressor 10 is connected to the D pipe of the first four-way valve 51. The first four-way valve 51 has a pipe C connected to an inlet end of the first indoor heat exchanger, a pipe E connected to a pipe D of the second four-way valve 52, and a pipe S connected to a pipe S of the second four-way valve 52. The D-pipe of the second four-way valve 52 is connected to the outlet end of the first indoor heat exchanger 21, the E-pipe is connected to the inlet end of the second indoor heat exchanger 22, the C-pipe is connected to one end of the outdoor heat exchanger 30, and the S-pipe is connected to the return air port of the compressor 10. The electronic expansion valve 40 is disposed on a pipe between the outlet end of the second indoor heat exchanger 22 and the outdoor heat exchanger 30.

The heat pump drying system has three operation modes, namely a heating mode, a heating initial mode and a cooling initial mode. The flow direction of the refrigerant is changed by controlling the on/off of the first four-way valve 51 and the second four-way valve 52. So as to realize the switching of the heat pump drying system between different operation modes. The initial state of the first four-way valve 51 and the second four-way valve 52 is a power-off state. Wherein the first four-way valve 51 is equivalent to an on-off valve in the disclosed embodiment. When the first four-way valve 51 is turned off, the refrigerant flows through the first indoor heat exchanger 21. When the first four-way valve 51 is energized, the refrigerant does not flow through the first indoor heat exchanger 21.

In the temperature-increasing heating mode, the first four-way valve 51 is turned off, and the second four-way valve 52 is turned on. The high-temperature and high-pressure refrigerant discharged from the compressor 10 flows into the first indoor heat exchanger 21 through the D and C pipes of the first four-way valve 51, exchanges heat at the first indoor heat exchanger 21, and provides heat for the drying room. Then the refrigerant flows into the second indoor heat exchanger 22 through the pipes D and E of the second four-way valve 52, and exchanges heat again at the second indoor heat exchanger 22 to provide heat for the drying room. The refrigerant is throttled by the electronic expansion valve 40 into the outdoor heat exchanger 30, and finally flows back to the compressor through the E and S pipes of the second four-way valve 52. So, the mode of heating up heats for the stoving room provides heat through two indoor heat exchangers. In the heating mode, the first four-way valve can be controlled to be electrified for saving energy. Therefore, the first indoor heat exchanger does not work, the second indoor heat exchanger is a condenser, and the outdoor heat exchanger is an evaporator. The heat pump drying system provides heat for the drying room through the second indoor heat exchanger (as shown in figure 2). This mode is also referred to as a power saving mode.

Referring to fig. 3, an embodiment of the present disclosure provides a method for controlling a heat pump drying system, including:

s101, under the condition that the heat pump drying system operates in a heating mode, the temperature sensor detects the indoor temperature of the drying room.

And S102, controlling the heat pump drying system to operate in an energy-saving mode by the processor under the condition that the indoor temperature meets the preset condition.

The energy-saving mode refers to that only one condenser works in the heating mode.

Here, the material drying takes three periods, namely, a yellowing period, a color fixing period and a gluten drying period. And in the yellowing period, the heat pump drying system mainly operates a heating mode to provide heat for the drying room so as to dry out moisture in the materials. As described above, in this mode, both the first indoor heat exchanger and the second indoor heat exchanger are condensers, that is, both the indoor heat exchangers provide heat for the drying room. As the heat of the drying room is accumulated, the indoor temperature is gradually increased and is higher than the target temperature. At this time, if the two indoor heat exchangers are continuously used for supplying heat, energy is wasted. Therefore, the indoor temperature of the drying room is detected in the heating mode. And if the indoor temperature meets the preset condition, controlling the heat pump drying system to operate in an energy-saving mode. Wherein the preset condition may be a temperature condition. If the indoor temperature is higher than the target temperature, or the difference between the indoor temperature and the target temperature is higher than a preset threshold value, etc.

The energy-saving mode is different from the heating mode in that the first indoor heat exchanger stops working. The condenser is only the second indoor heat exchanger. So, provide the heat for the stoving room through second indoor heat exchanger. Not only can maintain the temperature in the drying room, but also can save energy.

By adopting the method for controlling the heat pump drying system provided by the embodiment of the disclosure, when the heat pump drying system is operated in a heating mode to heat materials to be dried, the temperature in the drying room can be detected in real time. When the indoor temperature meets the preset conditions, the heat pump drying system can be controlled to operate in an energy-saving mode. Wherein, the energy-saving mode means that only one of the two condensers works. Thus, under the condition of meeting the indoor temperature requirement, one condenser is controlled to work. Therefore, the indoor temperature can be maintained, and the energy saving is facilitated.

Optionally, in step S102, the preset conditions include:

the indoor temperature is higher than the target temperature of the heating mode; and the running time of the heat pump drying system for maintaining the indoor temperature is longer than the first time.

Here, the operation energy saving mode needs to satisfy two conditions. The condition is that the indoor temperature is greater than the target temperature of the warming heating mode. The second condition is that the duration time of the indoor temperature is longer than the first time, namely the operation time of the heat pump drying system is longer than the first time from the indoor temperature being higher than the target temperature. Wherein, the value of the first time length can be determined according to the weight of the material to be dried. Generally, the heavier the material to be dried, the longer the value of the first time period. For example, 5 tons of materials to be dried can be dried for a first time period of 200-300 min. Thus, the indoor temperature is maintained greater than the target temperature for the first period of time. The indoor temperature is kept stable, and the situation that the indoor temperature is reduced quickly after the operation in the energy-saving mode is avoided, and drying is not facilitated.

Optionally, in step S102, the processor controls the heat pump drying system to operate in an energy saving mode, including:

the processor reduces the operating frequency of the compressor and controls the first four-way valve to change direction, so that the refrigerant flowing out of the first four-way valve flows into the second indoor heat exchanger through the second four-way valve; the refrigerant no longer flows into the first indoor heat exchanger.

Here, the first four-way valve is controlled to be reversed (i.e., the first four-way valve is controlled to be energized) so that the refrigerant does not flow into the first indoor heat exchanger any more, but flows into the second indoor heat exchanger through the second four-way valve. As such, the first indoor heat exchanger does not operate, and only the second indoor heat exchanger operates. Meanwhile, because the number of condensers is reduced, the heat exchange amount is reduced, and the operating frequency of the compressor can be reduced. The operating frequency of the compressor may be determined based on the indoor temperature. For example: the compressor is controlled to operate to maintain the lowest temperature allowed in the room (i.e., the lowest temperature allowed in the warming heating mode). Or the operation frequency of the compressor in the energy-saving mode is 60-70% of the operation frequency of the compressor in the heating mode.

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

s101, under the condition that the heat pump drying system operates in a heating mode, the temperature sensor detects the indoor temperature of the drying room.

And S102, controlling the heat pump drying system to operate in an energy-saving mode by the processor under the condition that the indoor temperature meets the preset condition. The energy-saving mode refers to that only one condenser works in the heating mode.

And S203, after the second time, the processor acquires the current indoor temperature of the drying room again.

And S204, the processor corrects the running frequency of the compressor according to the current indoor temperature and the target temperature of the heating mode.

Here, after the heat pump drying system operates in the energy saving mode, it is necessary to detect the indoor temperature of the drying room. If the temperature change in the drying room is large, the operation frequency of the compressor needs to be corrected. To maintain the indoor temperature stable. Specifically, after the energy-saving mode is operated for the second time period, the current indoor temperature is detected. Wherein the second time period may be 10-30min. And then comparing the current indoor temperature with the target temperature of the heating mode. Generally, the current indoor temperature is greater than the target temperature, and the operating frequency of the compressor is lowered. And when the current indoor temperature is lower than the target temperature, increasing the running frequency of the compressor. Therefore, the relative stability of the indoor temperature is ensured, and the large fluctuation of the indoor temperature caused by the energy-saving mode is avoided.

Optionally, in step S204, the processor corrects the operating frequency of the compressor according to the current indoor temperature and the target temperature of the heating mode, including:

the processor calculates a first difference between the current indoor temperature and the target temperature.

The processor maintains the operating frequency of the compressor if the first difference is greater than or equal to the first temperature and less than or equal to the second temperature.

The processor increases the operating frequency of the compressor when the first difference is less than the first temperature.

The processor reduces the operating frequency of the compressor if the first difference is greater than the second temperature.

Here, a first difference between the current indoor temperature and the target temperature is calculated, and the first difference is compared with a preset first temperature and a preset second temperature. Wherein the first temperature is less than the second temperature, the first temperature can take the value of-2 ℃, and the second temperature can take the value of 2 ℃. When the first difference is greater than or equal to the first temperature and less than or equal to the second temperature (namely-2 is less than or equal to delta T less than or equal to 2), the indoor temperature fluctuation is small, and the indoor temperature is in a relatively stable state. In this case, the operating frequency of the compressor is maintained without correcting the operating frequency of the compressor. When the first difference is less than the first temperature (i.e., Δ T < -2), it indicates that the indoor temperature fluctuation is large and the indoor temperature is in a decreased state. The operating frequency of the compressor needs to be increased to increase the indoor temperature. When the first difference is greater than the second temperature (i.e., Δ T > 2), it indicates that the indoor temperature fluctuation is large and the indoor temperature is in an increased state. The operation frequency of the compressor needs to be reduced to save energy.

Optionally, in step S204, the processor modifies the operating frequency of the compressor, including:

the larger the absolute value of the difference is, the larger the increase or decrease in the operating frequency of the compressor is.

Here, when the operating frequency of the compressor is corrected, the operating frequency may be corrected by the magnitude of the difference. The larger the absolute value of the difference is, the more the current indoor temperature deviates from the target temperature. Therefore, the larger the magnitude of the correction of the compressor operation frequency.

Optionally, the magnitude of the correction to the operating frequency of the compressor is equal to the ratio of the absolute value of the difference to a predetermined factor. As an example, if the difference between the current indoor temperature and the target temperature is-5 ℃, the preset coefficient is 2, and the increase of the operating frequency of the compressor is 5/2=2.5hz. Further, the upward value is 3Hz. Therefore, the running frequency of the compressor can be accurately adjusted.

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

s101, under the condition that the heat pump drying system operates in a heating mode, the temperature sensor detects the indoor temperature of the drying room.

And S102, controlling the heat pump drying system to operate in an energy-saving mode by the processor under the condition that the indoor temperature meets the preset condition. The energy-saving mode refers to a mode that only one condenser works in a heating mode.

And S303, the processor acquires the difference between the real-time indoor temperature of the drying room and the target temperature in the heating mode.

And S304, if the second difference value is continuously lower than the third temperature within the third time period, the processor controls the heat pump drying system to exit the energy-saving mode.

Here, a second difference between the real-time indoor temperature and the target temperature is acquired after the energy saving mode is operated. And if the second difference is smaller than the third temperature and the duration reaches the third duration, controlling the heat pump drying system to exit the energy-saving mode and return to the heating mode. Wherein the third temperature can be-5 ℃, and the third time length can be 15-30min. That is, after the energy-saving mode is operated, if the indoor temperature is greatly reduced and stays at the temperature for a long time, it indicates that the energy-saving mode cannot maintain the indoor temperature. Therefore, the energy saving mode is switched to the temperature increasing heating mode. Namely, the first four-way valve is controlled to be powered off, and the first indoor heat exchanger is started.

Optionally, in step S304, before the processor controls the heat pump drying system to exit the energy saving mode, the method further includes:

the processor obtains an operating frequency of the compressor.

And under the condition that the operating frequency of the compressor is the highest operating frequency, the processor controls the heat pump drying system to exit the energy-saving mode.

Here, it is determined whether the compressor is in a maximum load state before exiting the saving mode. The operating frequency of the compressor is detected. If the operation frequency of the compressor is the highest operation frequency, it indicates that the compressor is in the maximum load state, but the indoor temperature cannot be maintained. At the moment, the heat pump drying system is controlled to exit, and the heating mode is executed.

The embodiment of the disclosure provides a device for controlling a heat pump drying system, which comprises a detection module and a control module. The detection module is configured to detect the indoor temperature of the drying room under the condition that the heat pump drying system operates in the heating mode. The control module is configured to control the heat pump drying system to operate in an energy-saving mode under the condition that the indoor temperature meets a preset condition; the energy-saving mode refers to that only one condenser works in the heating mode.

By adopting the device for controlling the heat pump drying system provided by the embodiment of the disclosure, when the heat pump drying system is operated in a heating mode to heat materials to be dried, the temperature in the drying room can be detected in real time. When the indoor temperature meets the preset condition, the heat pump drying system can be controlled to operate in an energy-saving mode. Wherein, the energy-saving mode means that only one of the two condensers works. Thus, one condenser is controlled to operate under the condition that the indoor temperature requirement is met. Therefore, the indoor temperature can be maintained, and the energy saving is facilitated.

As shown in fig. 6, an embodiment of the present disclosure provides an apparatus for controlling a heat pump drying system, which includes a processor (processor) 100 and a memory (memory) 101. Optionally, the apparatus may also include a Communication Interface (Communication Interface) 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other through the bus 103. The communication interface 102 may be used for information transfer. The processor 100 may invoke logic instructions in the memory 101 to perform the method for controlling the heat pump drying system of the above-described embodiment.

In addition, the logic instructions in the memory 101 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.

The memory 101, which is a computer-readable storage medium, may 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 100 executes functional applications and data processing, i.e., implements the method for controlling the heat pump drying system in the above-described embodiment, by executing program instructions/modules stored in the memory 101.

The memory 101 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 101 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 system, which comprises the device for controlling the heat pump drying system.

The disclosed embodiments provide a storage medium storing computer-executable instructions configured to perform the above-described method for controlling a heat pump drying system.

The 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, which is stored in a storage medium and includes one or more instructions for enabling 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 disclosure. And the aforementioned storage medium may be a non-transitory storage medium comprising: a U-disk, a portable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other media capable of storing program codes, and may also be a transient storage medium.

The above description and the 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" \8230; "does not exclude the presence of additional like elements in a process, method or apparatus comprising 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 only one type of logical functional division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or may be 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 (10)

1. A method for controlling a heat pump drying system is characterized in that a refrigerant circulation loop of the heat pump drying system comprises a first indoor heat exchanger and a second indoor heat exchanger; in the heating mode, two indoor heat exchangers are connected in series and are both condensers; the method comprises the following steps:

detecting the indoor temperature of a drying room under the condition that the heat pump drying system operates in a heating mode;

controlling the heat pump drying system to operate in an energy-saving mode under the condition that the indoor temperature meets a preset condition;

the energy-saving mode refers to that only one condenser works in a heating mode.

2. The method according to claim 1, wherein the preset condition comprises:

the indoor temperature is higher than the target temperature of the heating mode; and the number of the first and second groups is,

the duration that the indoor temperature is greater than the target temperature is greater than a first duration.

3. The method as claimed in claim 1, wherein the inlet ends of the first and second indoor heat exchangers are respectively provided with a first four-way valve and a second four-way valve, and two ports of the first four-way valve are respectively connected with two ports of the second four-way valve; the control of the heat pump drying system to operate in an energy-saving mode comprises the following steps:

reducing the operating frequency of the compressor; and the number of the first and second electrodes,

controlling the first four-way valve to change the direction so that the refrigerant flowing out of the first four-way valve flows into a second indoor heat exchanger through the second four-way valve; the refrigerant does not flow into the first indoor heat exchanger any more.

4. The method of claim 1, wherein after controlling the heat pump drying system to operate in the energy saving mode, the method further comprises:

after the second time, acquiring the current indoor temperature of the drying room again;

and correcting the running frequency of the compressor according to the current indoor temperature and the target temperature of the heating mode.

5. The method as claimed in claim 4, wherein the modifying the operating frequency of the compressor according to the current indoor temperature and the target temperature of the warming heating mode comprises:

calculating a first difference between the current indoor temperature and the target temperature;

maintaining an operating frequency of the compressor when the first difference is greater than or equal to a first temperature and less than or equal to a second temperature;

increasing an operating frequency of the compressor if the first difference is less than a first temperature;

and reducing the operating frequency of the compressor under the condition that the first difference value is greater than the second temperature.

6. The method of claim 5, wherein said modifying the operating frequency of the compressor comprises:

the larger the absolute value of the difference is, the larger the increase or decrease in the operating frequency of the compressor is.

7. The method as claimed in any one of claims 1 to 6, wherein after controlling the heat pump drying system to operate in the energy saving mode, the method comprises:

acquiring a second difference value between the real-time indoor temperature of the drying room and the target temperature in the heating mode;

and if the second difference value is continuously lower than the third temperature within the third time period, controlling the heat pump drying system to exit the energy-saving mode.

8. An apparatus for controlling a heat pump drying system, comprising a processor and a memory storing program instructions, characterized in that the processor is configured to execute the method for controlling a heat pump drying system according to any one of claims 1 to 7 when executing the program instructions.

9. A heat pump drying system, comprising:

the refrigerant circulating loop comprises a first indoor heat exchanger and a second indoor heat exchanger, wherein inlet ends of the first indoor heat exchanger and the second indoor heat exchanger are respectively provided with a first four-way valve and a second four-way valve, and two ports of the first four-way valve are respectively connected with two ports of the second four-way valve; and the combination of (a) and (b),

the apparatus for controlling a heat pump drying system of claim 8.

10. A storage medium storing program instructions, characterized in that said program instructions, when executed, perform a method for controlling a heat pump drying system according to any of claims 1 to 7.

Images