CN114353368A - Defrosting method and device for heat pump drying equipment and heat pump drying equipment - Google Patents
Defrosting method and device for heat pump drying equipment and heat pump drying equipment Download PDFInfo
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- CN114353368A CN114353368A CN202111567297.6A CN202111567297A CN114353368A CN 114353368 A CN114353368 A CN 114353368A CN 202111567297 A CN202111567297 A CN 202111567297A CN 114353368 A CN114353368 A CN 114353368A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/04—Heating arrangements using electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
- F26B9/02—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in buildings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
- F25B2347/023—Set point defrosting
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The application relates to the technical field of drying equipment, and discloses a defrosting method for heat pump drying equipment, which comprises the steps of determining whether to enter defrosting operation or not according to the temperature of an outer coil and the condensation temperature after heating operation and a first time period; in the case of entering the defrosting operation, the four-way valve is periodically controlled to be reversed to perform the defrosting operation. And under the condition of entering defrosting operation, the heat pump drying equipment periodically controls the four-way valve to change the direction, so that the second refrigerant circulating system defrosts the first outdoor heat exchanger and the second outdoor heat exchanger, and the first refrigerant circulating system without the four-way valve is used for heating the drying room. Because the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, the influence of pressure loss of the four-way valve is avoided, and the heating effect of the drying room is improved, so that the drying effect of the drying room is ensured while the heat pump drying equipment defrosts. The application also discloses a device and heat pump drying equipment that are used for heat pump drying equipment to change frost.
Description
Technical Field
The application relates to the technical field of drying equipment, for example, to a defrosting method and device for heat pump drying equipment and heat pump drying equipment.
Background
At present, heat pump drying equipment on the market meets that external environment temperature is lower, and under the long-term operation's of heat pump drying equipment the condition, outdoor evaporimeter produces the frosting phenomenon easily to influence heat pump drying equipment's heat exchange efficiency, lead to the stoving effect poor.
In the prior art, there is a control method for a heat pump system, including: the air conditioner comprises a first refrigerant air-conditioning subsystem and a second refrigerant air-conditioning subsystem, wherein the first refrigerant subsystem and the second refrigerant subsystem respectively form an independent refrigerant circulating system, and are thermally coupled through an outdoor heat exchanger so as to realize the heat exchange between a first refrigerant in the first refrigerant air-conditioning subsystem and a second refrigerant in the second refrigerant air-conditioning subsystem. According to the heat pump system and the control method, the mode that the double-refrigerant air conditioning system is thermally coupled through the outdoor heat exchanger is adopted, the first refrigerant subsystem is guaranteed to still operate in a heating mode during defrosting, and the indoor temperature is kept stable.
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:
the four-way valve is arranged on two refrigerant systems of the heat pump drying equipment in the prior art, and pressure loss can be generated due to the four-way valve, so that the pressure loss influences the temperature of a drying room when the heat pump drying equipment performs defrosting operation, and further influences the drying effect.
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 defrosting method and device for heat pump drying equipment and heat pump drying equipment, so as to avoid the influence of defrosting of the heat pump drying equipment on the temperature of a drying room, and guarantee the drying effect while defrosting.
In some embodiments, the heat pump drying equipment comprises a first refrigerant circulating system which is not provided with a four-way valve and is used for heating a drying room, and a second refrigerant circulating system which is provided with a four-way valve; the method comprises the following steps: after the operation heating is carried out for a first time, whether the defrosting operation is carried out is determined according to the temperature of the external coil and the condensation temperature; under the condition of entering defrosting operation, the four-way valve is periodically controlled to change direction to execute defrosting operation; the first outdoor heat exchanger of the first refrigerant circulating system and the second outdoor heat exchanger of the second refrigerant circulating system can exchange heat.
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 defrosting a heat pump drying apparatus.
In some embodiments, the heat pump drying apparatus includes: the system comprises an electric heating device arranged in a drying room, a first refrigerant circulating system which is not provided with a four-way valve and is used for heating the drying room, and a second refrigerant circulating system which is provided with the four-way valve, wherein heat exchange can be carried out between a first outdoor heat exchanger of the first refrigerant circulating system and a second outdoor heat exchanger of the second refrigerant circulating system; the device for defrosting the heat pump drying equipment is also included.
The defrosting method and device for the heat pump drying equipment and the heat pump drying equipment provided by the embodiment of the disclosure can achieve the following technical effects:
after the heat pump drying equipment is operated to heat and the first time is passed, the heat pump drying equipment is timely driven to defrost according to the temperature of the external coil pipe and the condensation temperature. And under the condition of entering defrosting operation, the heat pump drying equipment periodically controls the four-way valve to change the direction, so that the second refrigerant circulating system defrosts the first outdoor heat exchanger and the second outdoor heat exchanger, and the first refrigerant circulating system without the four-way valve is used for heating the drying room. Because the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, the influence of pressure loss of the four-way valve is avoided, and the heating effect of the drying room is improved, so that the drying effect of the drying room is ensured while the heat pump drying equipment defrosts.
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 diagram of a defrosting method for a heat pump drying device according to an embodiment of the disclosure;
fig. 2 is a schematic diagram of another defrosting method for a heat pump drying device provided by the embodiment of the disclosure;
fig. 3 is a schematic diagram of another defrosting method for a heat pump drying device provided by the embodiment of the disclosure;
fig. 4 is a schematic diagram of another defrosting method for a heat pump drying device provided by the embodiment of the disclosure;
fig. 5 is a schematic diagram of another defrosting method for a heat pump drying device provided by the embodiment of the disclosure;
fig. 6 is a schematic diagram of an apparatus for defrosting a heat pump drying device according to an embodiment of the present disclosure.
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. 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 corresponds to B refers to an association or binding relationship between a and B.
The embodiment of the present disclosure discloses a heat pump drying device, including: the electric heating device is arranged in the drying room, the first refrigerant circulating system which is not provided with the four-way valve and is used for heating the drying room and the second refrigerant circulating system which is provided with the four-way valve. The first refrigerant circulating system is not provided with a four-way valve and is used for heating the drying room. The second refrigerant circulating system can perform cooling or heating by switching the four-way valve. The first outdoor heat exchanger of the first refrigerant circulating system and the second outdoor heat exchanger of the second refrigerant circulating system are arranged in a crossed mode and can exchange heat.
With reference to fig. 1, an embodiment of the present disclosure provides a method for defrosting a heat pump drying apparatus, including:
and S01, after the heat pump drying equipment is operated to heat and the first time is passed, whether the defrosting operation is started or not is determined according to the temperature of the external coil and the condensation temperature.
And S02, the heat pump drying equipment periodically controls the four-way valve to change direction to execute defrosting operation under the condition of entering defrosting operation.
The heat pump drying equipment can be operated to heat the drying room by the first refrigerant circulating system and the second refrigerant circulating system, or the first refrigerant circulating system can heat the drying room and the second refrigerant circulating system is stopped.
By adopting the defrosting method for the heat pump drying equipment provided by the embodiment of the disclosure, after the heat pump drying equipment operates for heating and a first time period passes, the condition that an outdoor evaporator of the first refrigerant circulating system or the second refrigerant circulating system is frosted possibly exists, and the heating efficiency is influenced. At the moment, the heat pump drying equipment determines whether to enter defrosting operation or not according to the temperature of the external coil and the condensation temperature, so that the heat pump drying equipment can enter defrosting operation in time to defrost the evaporator on the outdoor side. The heat pump drying equipment periodically controls the four-way valve to change the direction so as to enable the second refrigerant circulating system to be in a refrigerating state, and the first refrigerant circulating system without the four-way valve is used for heating the drying room. At this time, the second outdoor heat exchanger of the second refrigerant cycle system is a condenser. Because first outdoor heat exchanger and second outdoor heat exchanger can carry out the heat exchange, consequently, the second outdoor heat exchanger not only can defrost the surface of self, can also defrost the surface of first outdoor heat exchanger. In addition, the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, so that the technical bias is overcome, the influence of pressure loss of the four-way valve is avoided, the heating effect of the drying room is improved, and the drying effect of the drying room is ensured while defrosting of the heat pump drying equipment is carried out.
Optionally, the heat pump drying device determines whether to enter a defrosting operation according to the temperature of the external coil and the condensation temperature, and includes: the heat pump drying equipment determines the condensation temperature according to the temperature of the external coil; and the heat pump drying equipment determines to enter defrosting operation under the condition that the temperature of the external coil is less than the condensation temperature.
Therefore, the heat pump drying equipment determines the condensation temperature according to the temperature of the outer coil pipe, and then determines whether to enter defrosting operation or not by comparing the temperature of the outer coil pipe with the condensation temperature. And under the condition that the temperature of the outer coil is greater than or equal to the condensation temperature, the defrosting operation is not carried out. And determining to enter defrosting operation under the condition that the temperature of the outer coil is less than the condensation temperature. The heat pump drying equipment can timely enter defrosting operation, and defrosting is timely carried out on the outdoor heat exchanger.
Optionally, the heat pump drying device determines the condensation temperature according to the temperature of the external coil, including: calculating Te (a) x Ta-b by using heat pump drying equipment; wherein Te is condensation temperature, a is a first calculation parameter, b is a second calculation parameter, and Ta is outer coil temperature.
Therefore, the heat pump drying equipment can accurately calculate the condensation temperature of the outdoor heat exchanger according to the formula. Wherein a and b are constants, a is 8 ℃ and b is 5 ℃. The specific value can be obtained according to experience or by looking up a table.
Optionally, the heat pump drying device determines a period for controlling the four-way valve to reverse to perform the defrosting operation as follows: the heat pump drying equipment determines defrosting interval time according to the temperature of the external coil; the heat pump drying equipment takes the defrosting interval time as a period.
Therefore, under the condition that the defrosting operation is determined according to the temperature of the external coil and the condensation temperature, the heat pump drying equipment determines the defrosting interval time according to the temperature of the external coil, and the condition that the defrosting operation is continuously executed and the temperature of a drying room is influenced is avoided.
Optionally, the determining, by the heat pump drying device, the defrosting interval time according to the temperature of the external coil includes: the heat pump drying equipment determines defrosting interval time corresponding to the temperature of the external coil according to the first relation; wherein the outer coil temperature is inversely related to the defrost interval.
Therefore, the lower the temperature of the outer coil pipe is, the lower the heating efficiency of the first refrigerant circulating system is, and the heating effect on the drying room is influenced. Therefore, under the condition that the temperature of the external coil is lower, the defrosting interval time for the second refrigerant circulating system to perform the defrosting operation is longer, so that the influence on the heat exchange efficiency of the first outdoor heat exchanger of the first refrigerant circulating system is reduced. When the outdoor heat exchanger is defrosted, the first refrigerant circulating system can better heat the drying room, and the drying effect of the drying room is ensured.
Optionally, the heat pump drying apparatus periodically controls the four-way valve to reverse to perform the defrosting operation, including: and the heat pump drying equipment periodically controls the four-way valve to change the direction according to the defrosting interval time, and closes the electronic expansion valve of the second indoor heat exchanger of the second refrigerant circulating system so as to refrigerate the second refrigerant circulating system.
Therefore, the heat pump drying equipment periodically controls the four-way valve to change direction according to the defrosting interval time so as to enable the second refrigerant circulating system to refrigerate. And defrosting the heat exchanger on the outdoor side by using the heat emitted by the second outdoor heat exchanger. At the moment, the electronic expansion valve of the second indoor heat exchanger of the second refrigerant circulating system is closed, so that the influence on the temperature in the drying room is avoided, and the drying effect of the drying room is further influenced.
With reference to fig. 2, an embodiment of the present disclosure provides a method for defrosting a heat pump drying apparatus, including:
and S01, after the heat pump drying equipment is operated to heat and the first time is passed, whether the defrosting operation is started or not is determined according to the temperature of the external coil and the condensation temperature.
And S02, the heat pump drying equipment periodically controls the four-way valve to change direction to execute defrosting operation under the condition of entering defrosting operation.
And S21, increasing the frequency of the compressor and the rotating speed of the fan of the first refrigerant circulating system under the condition that the heat pump drying equipment executes the defrosting operation, so that the temperature in the drying room is in a set temperature range.
By adopting the defrosting method for the heat pump drying equipment provided by the embodiment of the disclosure, the heat pump drying equipment periodically controls the four-way valve to change the direction, so that the second refrigerant circulating system is in a refrigerating state, and the first refrigerant circulating system without the four-way valve is used for heating a drying room. Because first outdoor heat exchanger and second outdoor heat exchanger can carry out the heat exchange, consequently, the second outdoor heat exchanger not only can defrost the surface of self, can also defrost the surface of first outdoor heat exchanger. Because the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, the influence of pressure loss of the four-way valve is avoided, and the heating effect of the drying room is improved, so that the drying effect of the drying room is ensured while the heat pump drying equipment defrosts. In addition, under the condition of executing the defrosting operation, the frequency of the compressor of the first refrigerant circulating system and the rotating speed of the fan are increased so as to improve the heating capacity of the first refrigerant circulating system and enable the temperature in the drying room to be in a set temperature range. Thereby avoiding the influence of defrosting on the heating of the drying room during operation and causing the poor drying effect.
With reference to fig. 3, an embodiment of the present disclosure provides a method for defrosting a heat pump drying apparatus, including:
and S01, after the heat pump drying equipment is operated to heat and the first time is passed, whether the defrosting operation is started or not is determined according to the temperature of the external coil and the condensation temperature.
And S02, the heat pump drying equipment periodically controls the four-way valve to change direction to execute defrosting operation under the condition of entering defrosting operation.
And S31, the heat pump drying equipment starts the electric heating device under the condition of executing the defrosting operation, so that the temperature in the drying room is in the set temperature range.
By adopting the defrosting method for the heat pump drying equipment provided by the embodiment of the disclosure, the heat pump drying equipment periodically controls the four-way valve to change the direction, so that the second refrigerant circulating system is in a refrigerating state, and the first refrigerant circulating system without the four-way valve is used for heating a drying room. Because first outdoor heat exchanger and second outdoor heat exchanger can carry out the heat exchange, consequently, the second outdoor heat exchanger not only can defrost the surface of self, can also defrost the surface of first outdoor heat exchanger. Because the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, the influence of pressure loss of the four-way valve is avoided, and the heating effect of the drying room is improved, so that the drying effect of the drying room is ensured while the heat pump drying equipment defrosts. In addition, under the condition of executing the defrosting operation, the electric heating device is started to perform extra compensation on the temperature in the drying room, so that the temperature in the drying room is in a set temperature range, and the influence of running defrosting on heating of the drying room is avoided.
Alternatively, as shown in fig. 4, in the case that the heat pump drying apparatus performs the defrosting operation, the starting of the electric heating device to make the temperature in the drying room be in the set temperature range includes:
and S41, the heat pump drying equipment acquires the temperature of the drying room.
S42, the heat pump drying equipment obtains the pressure of the air suction port of the compressor and the pressure of the air exhaust port of the compressor under the condition that the temperature of the drying room is lower than the target temperature.
And S43, the heat pump drying equipment controls the start and stop of the electric heating device according to the pressure of the air suction port of the compressor and the pressure of the air exhaust port of the compressor.
By adopting the defrosting method for the heat pump drying equipment provided by the embodiment of the disclosure, the heat pump drying equipment acquires the temperature of the drying room, and under the condition that the temperature of the drying room is lower than the target temperature, the heat pump drying equipment can judge the running state of the compressor through the pressure of the air suction port of the compressor and the pressure of the air exhaust port of the compressor so as to control the start and stop of the electric heating device, so that the temperature of the drying room can quickly reach the target temperature. The timeliness of starting and stopping the electric heating device is improved, and the condition that the temperature does not reach the standard due to the fact that the electric heating device is not controlled to be started and stopped in time according to the temperature or the running time is avoided.
Optionally, the heat pump drying apparatus controls the start and stop of the electric heating device according to the pressure of the air suction port of the compressor and the pressure of the air exhaust port of the compressor, and includes: the heat pump drying equipment calculates the pressure ratio of the pressure of the exhaust port of the compressor to the pressure of the suction port of the compressor; and under the condition that the pressure ratio is greater than a set threshold value, the heat pump drying equipment controls to start the electric heating device.
In this way, the heat pump drying device calculates the pressure ratio of the pressure at the exhaust port of the compressor to the pressure at the suction port of the compressor to judge the current state of the compressor. Because the heating capacity of the heat pump drying equipment is equal to the refrigerating capacity plus the input power of the compressor, and the pressure ratio of the compressor is in positive correlation with the power of the compressor, when the pressure ratio reaches a set threshold, the power of the compressor also reaches the maximum power value corresponding to the set threshold. Therefore, in the case that the pressure ratio is greater than the set threshold, the compressor power has already reached the maximum power value, but the temperature of the drying room is still lower than the target temperature value, and at this time, the electric heating device needs to be started to compensate the problem that the heating capacity is insufficient due to insufficient compressor power. Therefore, under the condition that the pressure ratio is greater than the set threshold value, the heat pump drying equipment controls the starting of the electric heating device, so that the starting and stopping of the electric heating device are more accurate, the heating is more timely, and the heating efficiency of the heat pump drying equipment is improved.
Optionally, the heat pump drying apparatus obtains a compressor suction port pressure and a compressor discharge port pressure, and includes: the heat pump drying equipment acquires the pressure of a plurality of compressor air suction ports and the pressure of a plurality of compressor air exhaust ports within set time; the heat pump drying equipment calculates a first average value of the pressures of the plurality of compressor air suction ports and a second average value of the pressures of the plurality of compressor air exhaust ports; the heat pump drying device determines the first average value as the pressure of the air suction port of the compressor and determines the second average value as the pressure of the air exhaust port of the compressor.
The pressure of the plurality of compressor air suction ports refers to the pressure value of the compressor air suction ports in a plurality of different moments; the plurality of compressor discharge port pressures refer to pressure values of the compressor discharge port at a plurality of different times.
Therefore, in the process of detecting the pressure of the air suction port of the compressor and the pressure of the exhaust port of the compressor by the heat pump drying equipment, in order to avoid the condition that the pressure ratio is inaccurate due to the unstable pressure of the air suction port of the compressor or the unstable pressure of the exhaust port of the compressor, the heat pump drying equipment obtains the pressure of a plurality of air suction ports of the compressor and the pressure of a plurality of exhaust ports of the compressor within the set time, and the measurement error of the pressure of the air suction port of the compressor and the pressure of the exhaust port is reduced. The first average value of the pressures of the plurality of compressor air suction ports and the second average value of the pressures of the plurality of compressor air exhaust ports are respectively taken, the first average value is determined as the pressure of the compressor air suction ports, the second average value is determined as the pressure of the compressor air exhaust ports, the problem that the pressure ratio is inaccurate due to the fact that the pressure of the compressor air suction ports or the pressure of the compressor air exhaust ports is unstable can be avoided, the accuracy of the pressure ratio of the compressor is improved, and the starting and stopping time of the electric heating device is more accurate.
With reference to fig. 5, an embodiment of the present disclosure provides a method for defrosting a heat pump drying apparatus, including:
and S01, after the heat pump drying equipment is operated to heat and the first time is passed, whether the defrosting operation is started or not is determined according to the temperature of the external coil and the condensation temperature.
And S02, the heat pump drying equipment periodically controls the four-way valve to change direction to execute defrosting operation under the condition of entering defrosting operation.
And S51, the heat pump drying equipment starts the fresh air valve and the exhaust valve at a second time interval under the condition that the defrosting operation is carried out, so that the humidity in the drying room is in the set humidity range.
By adopting the defrosting method for the heat pump drying equipment provided by the embodiment of the disclosure, the heat pump drying equipment periodically controls the four-way valve to change the direction, so that the second refrigerant circulating system is in a refrigerating state, and the first refrigerant circulating system without the four-way valve is used for heating a drying room. Because first outdoor heat exchanger and second outdoor heat exchanger can carry out the heat exchange, consequently, the second outdoor heat exchanger not only can defrost the surface of self, can also defrost the surface of first outdoor heat exchanger. Because the first refrigerant circulating system is not provided with the four-way valve and is only used for heating the drying room, the influence of pressure loss of the four-way valve is avoided, and the heating effect of the drying room is improved, so that the drying effect of the drying room is ensured while the heat pump drying equipment defrosts. In addition, the heat pump drying equipment starts the fresh air valve and the exhaust valve at a second interval time, so that the humidity in the drying room is in a set humidity range, and the drying effect in the drying room is ensured.
Referring to fig. 6, an apparatus for defrosting a heat pump drying device according to an embodiment of the present disclosure 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 via a bus 103. The communication interface 102 may be used for information transfer. The processor 100 may call logic instructions in the memory 101 to execute the method for defrosting a heat pump drying apparatus of the above 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 by executing program instructions/modules stored in the memory 101, that is, implements the method for defrosting the heat pump drying apparatus in the above embodiment.
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 present disclosure provides a heat pump drying device, including: the system comprises an electric heating device arranged in a drying room, a first refrigerant circulating system which is not provided with a four-way valve and is used for heating the drying room, and a second refrigerant circulating system which is provided with the four-way valve, wherein heat exchange can be carried out between a first outdoor heat exchanger of the first refrigerant circulating system and a second outdoor heat exchanger of the second refrigerant circulating system; the device for defrosting the heat pump drying equipment is also included.
The embodiment of the disclosure provides a storage medium, which stores computer-executable instructions configured to execute the method for defrosting a heat pump drying device.
The storage medium may be a transitory storage medium or a non-transitory 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 an …" does not exclude the presence of other 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 disclosures, 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 (10)
1. A defrosting method for heat pump drying equipment is characterized in that the heat pump drying equipment comprises a first refrigerant circulating system which is not provided with a four-way valve and is used for heating a drying room, and a second refrigerant circulating system which is provided with a four-way valve; the method comprises the following steps:
after the operation heating is carried out for a first time, whether the defrosting operation is carried out is determined according to the temperature of the external coil and the condensation temperature;
under the condition of entering defrosting operation, the four-way valve is periodically controlled to change direction to execute defrosting operation;
the first outdoor heat exchanger of the first refrigerant circulating system and the second outdoor heat exchanger of the second refrigerant circulating system can exchange heat.
2. The method of claim 1, wherein said determining whether to enter defrost operation based on the outside coil temperature and the condensation temperature comprises:
determining the condensation temperature according to the temperature of the external coil;
and determining to enter defrosting operation under the condition that the temperature of the external coil is less than the condensation temperature.
3. The method of claim 2, wherein said determining the dew point temperature from the outside coil temperature comprises:
calculating Te as a multiplied by Ta-b;
wherein Te is the condensation temperature, a is a first calculation parameter, b is a second calculation parameter, and Ta is the outer coil temperature.
4. The method of claim 1, wherein the period of controlling the four-way valve to commutate to perform the defrost operation is determined as follows:
determining the defrosting interval time according to the temperature of the external coil;
taking the defrost interval time as the cycle.
5. The method of claim 4, wherein said determining a defrost interval time based on said outside coil temperature comprises:
determining the defrosting interval time corresponding to the temperature of the external coil according to the first relation;
wherein the outer coil temperature is inversely related to the defrost interval duration.
6. The method of claim 4, wherein the periodically controlling the four-way valve to commutate to perform a defrost operation comprises:
and periodically controlling the four-way valve to change the direction according to the defrosting interval time, and closing an electronic expansion valve of a second indoor heat exchanger of the second refrigerant circulating system so as to refrigerate the second refrigerant circulating system.
7. The method according to any one of claims 1 to 6, further comprising:
and under the condition of executing the defrosting operation, increasing the frequency of a compressor of the first refrigerant circulating system and the rotating speed of a fan so as to enable the temperature in the drying room to be in a set temperature range.
8. The method according to any one of claims 1 to 6, wherein the heat pump drying equipment is further provided with an electric heating device in the drying room; the method further comprises the following steps:
in the case of performing the defrosting operation, the electric heating device is activated so that the temperature in the drying room is in the set temperature range.
9. An apparatus for heat pump drying equipment defrosting comprising a processor and a memory storing program instructions, characterized in that the processor is configured to carry out the method for heat pump drying equipment defrosting according to any one of claims 1 to 8 when executing the program instructions.
10. A heat pump drying device is characterized by comprising an electric heating device arranged in a drying room, a first refrigerant circulating system which is not provided with a four-way valve and is used for heating the drying room, and a second refrigerant circulating system which is provided with the four-way valve, wherein heat exchange can be carried out between a first outdoor heat exchanger of the first refrigerant circulating system and a second outdoor heat exchanger of the second refrigerant circulating system; the defrosting device for the heat pump drying equipment further comprises a device for defrosting according to claim 9.
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| CN202111567297.6A CN114353368A (en) | 2021-12-20 | 2021-12-20 | Defrosting method and device for heat pump drying equipment and heat pump drying equipment |
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| CN202111567297.6A CN114353368A (en) | 2021-12-20 | 2021-12-20 | Defrosting method and device for heat pump drying equipment and heat pump drying equipment |
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