CN115574557A - Heat pump drying unit and defrosting control method thereof - Google Patents
Heat pump drying unit and defrosting control method thereof Download PDFInfo
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- CN115574557A CN115574557A CN202211216514.1A CN202211216514A CN115574557A CN 115574557 A CN115574557 A CN 115574557A CN 202211216514 A CN202211216514 A CN 202211216514A CN 115574557 A CN115574557 A CN 115574557A
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- defrosting
- heat exchanger
- outdoor
- heat pump
- outdoor heat
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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
- F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
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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
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
Abstract
The invention relates to the technical field of defrosting, and particularly provides a heat pump drying unit and a defrosting control method thereof. The problem of current heat pump drying unit be difficult to realize defrosting under the lower condition of outdoor ambient temperature is solved. Therefore, the heat pump drying unit comprises a refrigerant heating system and an underground water defrosting system, wherein the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop, the underground water defrosting system comprises a water supply pipeline and a water supply pump arranged on the water supply pipeline, one end of the water supply pipeline is communicated with the underground water, and the water supply pipeline can guide the underground water to the outdoor heat exchanger for defrosting.
Description
Technical Field
The invention relates to the technical field of defrosting, and particularly provides a heat pump drying unit and a defrosting control method thereof.
Background
In order to improve the tobacco leaf drying efficiency, modern tobacco leaves are used in a curing barn in the processing process, and a heat pump drying unit is indispensable drying equipment of the tobacco leaf curing barn. Because the curing barn only needs drying operation, in order to save the manufacturing cost, the heat pump units used by the existing tobacco curing barn are all single-heat type drying units. However, in a region with a low temperature, the outdoor heat exchanger of the heat pump unit still has a problem that frosting is easy to occur and heating effect is affected, and the single-heat type heat pump unit is not provided with a four-way valve, so that the defrosting effect can not be realized by controlling the four-way valve to switch to enable the refrigerant to flow back. Based on this, what current heat pump drying unit adopted when the defrosting all is the mode of shutting down a period of time and going on naturally changing frost, and the compressor shut down for a long time again leads to the temperature reduction in the tobacco leaf roast room easily and leads to the flue-cured tobacco to receive the influence to when outdoor ambient temperature is crossed lowly, the mode of naturally changing frost is also basically invalid, thereby leads to the problem of unable normal change frost, and then leads to heat pump set's stoving ability to receive the influence.
Accordingly, there is a need in the art for a new heat pump dryer set and a defrost control method thereof to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to solve the technical problem that the existing heat pump drying unit is difficult to defrost under the condition of low outdoor environment temperature.
In a first aspect, the present invention provides a defrosting control method for a heat pump dryer group, where the heat pump dryer group includes a refrigerant heating system and an underground water defrosting system,
the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop,
the underground water defrosting system comprises a water supply pipeline and a water supply pump arranged on the water supply pipeline, wherein one end of the water supply pipeline is communicated with underground water, and the water supply pipeline can guide the underground water to the outdoor heat exchanger for defrosting;
the defrosting control method comprises the following steps:
acquiring the outdoor environment temperature under the condition that the outdoor heat exchanger is frosted;
and correspondingly controlling the heat pump drying unit to enter different defrosting modes according to the obtained outdoor environment temperature.
In a preferred technical solution of the above-mentioned defrosting control method, "according to the obtained outdoor environment temperature, correspondingly controlling the heat pump dryer group to enter different defrosting modes" includes:
if the outdoor environment temperature is less than or equal to the preset outdoor environment temperature, controlling the heat pump drying unit to enter an underground water defrosting mode;
wherein the groundwater defrost mode is set to direct groundwater at the outdoor heat exchanger for defrosting.
In a preferred technical solution of the above-mentioned defrosting control method, the step of "correspondingly controlling the heat pump dryer group to enter different defrosting modes according to the obtained outdoor environment temperature" further includes:
if the outdoor environment temperature is higher than the preset outdoor environment temperature, controlling the heat pump drying unit to enter a shutdown defrosting mode;
the shutdown defrosting mode is set to control the refrigerant heating system to stop running so as to achieve defrosting.
In a preferred technical solution of the above defrosting control method, when the heat pump drying unit enters an underground water defrosting mode or a shutdown defrosting mode, the defrosting control method further includes:
acquiring the coil temperature of the outdoor heat exchanger and the running time of the defrosting mode;
and selectively controlling the heat pump drying unit to exit the defrosting mode according to the temperature of the coil pipe of the outdoor heat exchanger and the running time of the defrosting mode.
In a preferred technical solution of the above-mentioned defrosting control method, "selectively controlling the heat pump dryer group to exit the defrosting mode according to the temperature of the coil of the outdoor heat exchanger and the length of time of the present operation of the defrosting mode" specifically includes:
and if the temperature of the coil of the outdoor heat exchanger is greater than the preset outdoor coil temperature and the current running time of the defrosting mode reaches a first preset running time, controlling the heat pump drying unit to exit the defrosting mode.
In a preferred embodiment of the above-described defrosting control method, before the step of "acquiring an outdoor ambient temperature", the defrosting control method further includes:
acquiring the temperature of a coil pipe of the outdoor heat exchanger and the current running time of the refrigerant heating system;
and judging the frost condition of the outdoor heat exchanger according to the temperature of the coil pipe of the outdoor heat exchanger and the current running time of the refrigerant heating system.
In a preferred technical scheme of the above-mentioned defrosting control method, the step of "determining the frost condition of the outdoor heat exchanger according to the coil temperature of the outdoor heat exchanger and the current operation duration of the refrigerant heating system" specifically includes:
and if the coil temperature of the outdoor heat exchanger is less than or equal to the frost coil temperature and the operation time of the refrigerant heating system is longer than a second preset operation time, determining that frost occurs in the outdoor heat exchanger.
In a second aspect, the present invention further provides a heat pump dryer set, the heat pump dryer set includes a refrigerant heating system and an underground water defrosting system,
the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop,
groundwater defrosting system includes the water supply pipeline and sets up feed pump on the water supply pipeline, the one end and the groundwater of water supply pipeline are linked together, and the water supply pipeline can lead to groundwater outdoor heat exchanger department is in order to defrost.
In the preferable technical scheme of the heat pump drying unit, a cavity is formed in the bottom of the outdoor heat exchanger, and the water supply pipeline is communicated with the cavity to input underground water into the cavity.
In the preferable technical scheme of the heat pump drying unit, the underground water defrosting system further comprises a water seepage tank, and the other end of the water supply pipeline is communicated with the water seepage tank.
Under the condition of adopting the technical scheme, the heat pump drying unit comprises a refrigerant heating system and an underground water defrosting system, wherein the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop; based on the structural arrangement mode, the underground water defrosting system is arranged to provide another defrosting mode, so that the defrosting effect of the heat pump drying unit in a low-temperature environment is effectively guaranteed, and the heating capacity of the heat pump drying unit is further effectively guaranteed. The defrosting control method of the invention comprises the following steps: acquiring the outdoor environment temperature under the condition that the outdoor heat exchanger is frosted; and correspondingly controlling the heat pump drying unit to enter different defrosting modes according to the obtained outdoor environment temperature. Based on the defrosting control method, the corresponding defrosting mode can be selected according to different outdoor environment temperatures, so that the energy consumption required in the defrosting process can be reduced to the maximum extent on the basis of effectively ensuring the defrosting effect.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of a heat pump dryer group of the present invention;
FIG. 2 is a flow chart of the main steps of the defrost control method of the present invention;
FIG. 3 is a flow chart of the specific steps of a preferred embodiment of the defrost control method of the present invention;
reference numerals:
11. a first refrigerant circulation circuit; 111. a first compressor; 112. a first indoor heat exchanger; 113. a first electronic expansion valve; 114. a first outdoor heat exchanger; 115. a first gas-liquid separator; 116. a first indoor fan; 117. a first outdoor fan;
12. a second refrigerant circulation circuit; 121. a second compressor; 122. a second indoor heat exchanger; 123. a second electronic expansion valve; 124. a second outdoor heat exchanger; 125. a second gas-liquid separator; 126. a second indoor fan; 127. a second outdoor fan;
13. a first water supply line; 131. a first solenoid valve;
14. a second water supply line; 141. a second solenoid valve;
15. a water pump;
16. and (4) a seepage tank.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications. For example, the number of refrigerant heating systems in the present invention may be one or more. Such changes in the specific structure may be made without departing from the basic principles of the invention and are intended to be within the scope of the invention.
It should be noted that, unless otherwise explicitly stated or limited, the terms "connected" and "communicating" in the description of the preferred embodiments are to be construed broadly, e.g., as meaning directly connected, indirectly connected through intervening media, or internally connected between two elements, and thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
Further, it should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
Referring to fig. 1, as shown in fig. 1, in the preferred embodiment, the heat pump dryer set of the present invention includes an underground water defrosting system and two refrigerant heating systems, that is, one underground water defrosting system in the preferred embodiment can defrost two refrigerant heating systems at the same time. Of course, this is not a limiting setting, and it may be that one underground water defrosting system defrosts one refrigerant heating system, that multiple underground water defrosting systems defrosts one refrigerant heating system together, or that one underground water defrosting system defrosts multiple refrigerant heating systems.
Specifically, referring to the orientation in fig. 1, the refrigerant heating system located above includes a first refrigerant circulation loop 11, and a first compressor 111, a first indoor heat exchanger 112, a first electronic expansion valve 113, a first outdoor heat exchanger 114, and a first gas-liquid separator 115 sequentially disposed on the first refrigerant circulation loop 11, wherein the first indoor heat exchanger 112 is used as a condenser, a first indoor fan 116 is disposed near the first indoor heat exchanger 112 to deliver heat to the tobacco flue-curing barn, the first outdoor heat exchanger 114 is used as an evaporator, and a first outdoor fan 117 is disposed near the first outdoor heat exchanger 114 to dissipate heat from the first outdoor heat exchanger 114. It should be noted that the present invention does not limit any specific structure of the first refrigerant circulation circuit 11, for example, other heat exchange elements may be further disposed on the first refrigerant circulation circuit 11, which is not limiting, and those skilled in the art can set the configuration according to actual needs.
In addition, the lower refrigerant heating system includes a second refrigerant circulation loop 12, and a second compressor 121, a second indoor heat exchanger 122, a second electronic expansion valve 123, a second outdoor heat exchanger 124 and a second gas-liquid separator 125 which are sequentially disposed on the second refrigerant circulation loop 12, wherein the second indoor heat exchanger 122 functions as a condenser, a second indoor fan 126 is disposed near the second indoor heat exchanger 122 to supply heat to the tobacco flue-curing barn, the second outdoor heat exchanger 124 functions as an evaporator, and a second outdoor fan 127 is disposed near the second outdoor heat exchanger 124 to dissipate heat from the second outdoor heat exchanger 124. It should be noted that the present invention does not limit any specific structure of the second refrigerant circulation circuit 12, for example, other heat exchange elements may be further disposed on the second refrigerant circulation circuit 12, which is not limiting, and those skilled in the art can set the heat exchange elements according to actual needs.
It should be noted that the present invention does not limit the control manner of the two refrigerant heating systems, and those skilled in the art can set the control manner according to actual requirements.
Further, with continued reference to fig. 1, the heat pump drying unit of the present invention further includes an underground water defrosting system, which in the present preferred embodiment includes a first water supply line 13 and a second water supply line 14 arranged in parallel, the first water supply line 13 and the second water supply line 14 share a water pump 15, that is, the water pump 15 can simultaneously power the first water supply line 13 and the second water supply line 14, and the water pump 15 can pump the underground water. As a preferred arrangement, the first water supply line 13 and the second water supply line 14 are both covered with insulation cotton to prevent the lines from freezing. In addition, a first electromagnetic valve 131 is arranged on the first water supply pipeline 13, the first electromagnetic valve 131 is used for controlling the on-off state of the first water supply pipeline 13, and the first water supply pipeline 13 can lead the underground water to the first outdoor heat exchanger 114 to defrost the first outdoor heat exchanger 114; the second water supply line 14 is provided with a second electromagnetic valve 141, the second electromagnetic valve 141 is used for controlling the on-off state of the second water supply line 14, and the second water supply line 14 can introduce the groundwater to the second outdoor heat exchanger 124 to defrost the second outdoor heat exchanger 124.
It should be noted that the present invention does not limit the specific structure of the groundwater defrosting system, as long as the groundwater defrosting system can guide groundwater to the outdoor heat exchanger to defrost.
In addition, it can be understood that the tobacco curing barn is usually built nearby an outdoor tobacco planting place, a manually built tobacco field irrigation water well which takes underground water as a water source is usually arranged nearby, the water temperature in the water well is kept constant between 15 ℃ and 17 ℃ throughout the year, and the water temperature in the water well can be at least 10 ℃ higher than the outdoor environment temperature in a low-temperature season, so that defrosting can be effectively realized by using the underground water.
Continuing to refer to fig. 1, as shown in fig. 1, the groundwater defrosting system further includes a water seepage tank 16, the other ends of the first water supply pipeline 13 and the second water supply pipeline 14 are both communicated with the water seepage tank 16, and the defrosted water can be introduced into the water seepage tank 16 and then seeps into the ground through the water seepage tank to be recycled. In addition, as a preferred technical solution, since the bottom of the heat exchanger is usually the most frosted part, the preferred embodiment is particularly provided with a cavity structure at the bottom of the outdoor heat exchanger, and the water supply pipeline is communicated with the cavity to input the groundwater into the cavity, thereby achieving better defrosting effect.
In addition, the heat pump dryer group further comprises a controller, the controller can obtain outdoor environment temperature and coil temperature of each outdoor heat exchanger, and can control the heat pump dryer group to operate different defrosting modes and the like, which are not restrictive. It can be understood by those skilled in the art that the present invention does not limit the specific structure and type of the controller, and the controller may be an original controller of the heat pump dryer set, or a controller separately configured to perform the defrosting control method of the present invention, and those skilled in the art can set the structure and type of the controller according to actual use requirements.
Referring next to fig. 2, fig. 2 is a flow chart illustrating the main steps of the defrost control method of the present invention. As shown in fig. 2, the defrosting control method of the present invention mainly includes the following steps:
s1: acquiring the outdoor environment temperature under the condition that the outdoor heat exchanger is frosted;
s2: and correspondingly controlling the heat pump drying unit to enter different defrosting modes according to the acquired outdoor environment temperature.
First, in step S1, in the case where frost occurs in the outdoor heat exchanger, the outdoor ambient temperature is acquired. It should be noted that, the invention does not limit the specific conditions for judging whether the outdoor heat exchanger has frost phenomenon, and the technicians in the field can set the conditions according to the actual use requirements; for example, it can be determined by taking a picture; also for example, it may be determined by the coil temperature of the outdoor heat exchanger. In addition, the invention does not limit the concrete mode of acquiring the outdoor environment temperature by the controller, and a person skilled in the art can set the mode according to the actual use requirement; for example, the outdoor ambient temperature may be acquired by setting an ambient temperature sensor by itself; for another example, the local outdoor ambient temperature may also be obtained in a networked manner, which is not limiting.
Next, in step S2, the controller can correspondingly control the heat pump dryer group to enter different defrosting modes according to the outdoor environment temperature obtained in step S1. It should be noted that, the present invention does not limit the specific control conditions, and it belongs to the protection scope of the present invention as long as the heat pump drying unit is controlled to enter different defrosting modes by the outdoor environment temperature; for example, the corresponding defrost mode may be determined by the range of values that the outdoor ambient temperature is in; for another example, the corresponding defrosting mode may be determined by a preset relational expression that the outdoor ambient temperature can satisfy.
Referring finally to fig. 3, fig. 3 is a flowchart illustrating the specific steps of a preferred embodiment of the defrost control method of the present invention. As shown in fig. 3, based on the heat pump dryer set in the above embodiment, the defrosting control method in the preferred embodiment of the present invention includes the following steps:
s101: acquiring the temperature of a coil pipe of the outdoor heat exchanger and the current running time of the refrigerant heating system;
s102: judging whether the temperature of the coil pipe is less than or equal to the temperature of the frost coil pipe and whether the operation duration is longer than a second preset operation duration; if yes, go to step S103; if not, executing step S101 again;
s103: acquiring the outdoor environment temperature;
s104: judging whether the outdoor environment temperature is less than or equal to a preset outdoor environment temperature; if yes, executing step S105; if not, executing step S106;
s105: controlling the heat pump drying unit to enter a ground water defrosting mode;
s106: controlling the heat pump drying unit to enter a shutdown defrosting mode;
s107: acquiring the coil temperature of the outdoor heat exchanger and the running time of the defrosting mode;
s108: and if the coil temperature of the outdoor heat exchanger is greater than the preset outdoor coil temperature and the running time of the defrosting mode reaches a first preset running time, controlling the heat pump drying unit to exit the defrosting mode.
Specifically, in step S101, the controller may obtain a coil temperature of an outdoor heat exchanger and a current operation duration of a refrigerant heating system, so as to determine a frost condition of the outdoor heat exchanger according to the obtained coil temperature of the outdoor heat exchanger and the current operation duration of the refrigerant heating system; of course, this is only a preferred judgment method, and is not a restrictive judgment method, and those skilled in the art may judge the frost condition of the outdoor heat exchanger in other ways.
Based on the judgment mode, if the coil temperature of the outdoor heat exchanger is less than or equal to the frost coil temperature and the operation time of the refrigerant heating system is longer than the second preset operation time, it is determined that frost occurs to the outdoor heat exchanger. It should be noted that, the specific values of the temperature of the frost coil and the second preset operation time period are not limited in the present invention, and those skilled in the art can set the specific values according to actual use requirements; preferably, the temperature of the frost coil is set to 3 ℃, and the second preset operation time is set to 40 minutes, so as to accurately judge the frost condition of the outdoor heat exchanger.
Next, in step S103, in the case where it is determined that frost has occurred in the outdoor heat exchanger based on the determination result of step S102, the outdoor ambient temperature is acquired. It should be noted that, the present invention does not limit the specific way for the controller to obtain the outdoor ambient temperature, and those skilled in the art can set the temperature according to the actual use requirement; for example, it may acquire the outdoor ambient temperature by setting the ambient temperature sensor itself; for another example, the local outdoor ambient temperature may also be obtained in a networked manner, which is not limiting.
Further, in step S104, the controller can determine whether the outdoor environment temperature is less than or equal to the preset outdoor environment temperature, so as to effectively determine the defrosting mode that should be selected, thereby effectively saving energy consumption on the basis of ensuring the defrosting effect. It should be noted that, the present invention does not limit the specific value of the preset outdoor environment temperature, as long as it can judge whether the shutdown defrosting mode can defrost normally; preferably, the preset outdoor ambient temperature is set to 5 ℃.
Based on the determination result of step S104, if the outdoor environment temperature is less than or equal to the preset outdoor environment temperature, step S105 is executed, that is, the heat pump drying unit is controlled to enter a groundwater defrosting mode, where the groundwater defrosting mode is set to introduce groundwater to the outdoor heat exchanger for defrosting. And if the outdoor environment temperature is greater than the preset outdoor environment temperature, executing a step S106, namely, controlling the heat pump drying unit to enter a shutdown defrosting mode, wherein the shutdown defrosting mode is set to control the refrigerant heating system to stop running so as to realize defrosting.
Finally, in step S107, the controller may obtain the coil temperature of the outdoor heat exchanger and the current operation duration of the defrosting mode, so as to selectively control the heat pump dryer group to exit from the corresponding defrosting mode according to the coil temperature of the outdoor heat exchanger and the current operation duration of the defrosting mode. It can be understood that, in the case that the heat pump drying unit operates the underground water defrosting mode, the current operation time of the defrosting mode is the current operation time of the underground water defrosting mode; and under the condition that the heat pump drying unit operates in the shutdown defrosting mode, the current operation time of the defrosting mode is the current operation time of the shutdown defrosting mode.
Specifically, as a specific implementation manner, in step S108, if the temperature of the coil of the outdoor heat exchanger is greater than the preset outdoor coil temperature and the current operation duration of the defrosting mode reaches the first preset operation duration, the heat pump drying unit is controlled to exit the defrosting mode. It should be noted that, the present invention does not limit the specific values of the preset outdoor coil temperature and the first preset operation time; preferably, the preset outdoor coil temperature is set to 3 ℃ and the first preset operating time period is set to 5 minutes.
Based on the control method described in the above preferred embodiment, as a specific example:
in the case where the first outdoor heat exchanger 114 needs defrosting, but the second outdoor heat exchanger 124 does not need defrosting, the water pump 15 is turned on and preferably operated at one-half of the maximum rotation speed, the first solenoid valve 131 is opened, and the second solenoid valve 141 is closed to defrost the first outdoor heat exchanger 114; and when the temperature of the coil of the first outdoor heat exchanger 114 is more than 3 ℃ and the running time of the underground water defrosting mode reaches 5 minutes, the defrosting control is quitted.
In the case where the first outdoor heat exchanger 114 does not need to be defrosted and the second outdoor heat exchanger 124 needs to be defrosted, the water pump 15 is turned on and preferably operated at one-half of the maximum rotation speed, the first solenoid valve 131 is closed, and the second solenoid valve 141 is opened to defrost the second outdoor heat exchanger 124; and when the coil temperature of the second outdoor heat exchanger 124 is more than 3 ℃ and the running time of the underground water defrosting mode reaches 5 minutes, the defrosting control is quitted.
In the case where the first and second outdoor heat exchangers 114 and 124 are both required to be defrosted, the water pump 15 is turned on and preferably operated at the maximum rotation speed, and the first and second solenoid valves 131 and 141 are both turned on to simultaneously defrost the first and second outdoor heat exchangers 114 and 124; and when the coil temperatures of the first outdoor heat exchanger 114 and the second outdoor heat exchanger 124 are both more than 3 ℃ and the running time of the underground water defrosting mode reaches 5 minutes, the defrosting control is quitted.
In addition, after the defrosting control is quitted, the first electromagnetic valve 131 and the second electromagnetic valve 141 are both opened, so that the water in the outdoor heat exchanger flows back to the water seepage tank 16 under the action of gravity, the water returns to the underground, the icing and blocking of the pipeline are effectively avoided, the next defrosting is prevented from being adversely affected, and the reliability of defrosting is ensured.
Finally, it should be noted that, those skilled in the art can adjust the specific implementation steps of the defrosting control method according to the specific structure of the heat pump dryer group, and such changes do not depart from the basic principle of the present invention and fall into the protection scope of the present invention.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. A defrosting control method of a heat pump drying unit is characterized in that the heat pump drying unit comprises a refrigerant heating system and an underground water defrosting system,
the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop,
the underground water defrosting system comprises a water supply pipeline and a water supply pump arranged on the water supply pipeline, wherein one end of the water supply pipeline is communicated with underground water, and the water supply pipeline can guide the underground water to the outdoor heat exchanger for defrosting;
the defrosting control method comprises the following steps:
acquiring the outdoor environment temperature under the condition that the outdoor heat exchanger is frosted;
and correspondingly controlling the heat pump drying unit to enter different defrosting modes according to the acquired outdoor environment temperature.
2. The defrosting control method according to claim 1, wherein the step of correspondingly controlling the heat pump dryer group to enter different defrosting modes according to the acquired outdoor environment temperature includes:
if the outdoor environment temperature is less than or equal to the preset outdoor environment temperature, controlling the heat pump drying unit to enter an underground water defrosting mode;
wherein the groundwater defrost mode is set to direct groundwater at the outdoor heat exchanger for defrosting.
3. The defrosting control method according to claim 2, wherein the step of correspondingly controlling the heat pump dryer group to enter different defrosting modes according to the acquired outdoor environment temperature further comprises:
if the outdoor environment temperature is higher than the preset outdoor environment temperature, controlling the heat pump drying unit to enter a shutdown defrosting mode;
the shutdown defrosting mode is set to control the refrigerant heating system to stop running so as to achieve defrosting.
4. The defrost control method of any one of claims 1-3, wherein in case the heat pump dryer group enters a ground water defrost mode or a shutdown defrost mode, the defrost control method further comprises:
acquiring the coil temperature of the outdoor heat exchanger and the current running time of the defrosting mode;
and selectively controlling the heat pump drying unit to exit the defrosting mode according to the temperature of the coil pipe of the outdoor heat exchanger and the running time of the defrosting mode.
5. The defrosting control method according to claim 4, wherein the step of selectively controlling the heat pump dryer group to exit the defrosting mode according to the coil temperature of the outdoor heat exchanger and the running time of the defrosting mode specifically includes:
and if the coil temperature of the outdoor heat exchanger is greater than the preset outdoor coil temperature and the running time of the defrosting mode reaches a first preset running time, controlling the heat pump drying unit to exit the defrosting mode.
6. The defrost control method of claim 1, wherein prior to performing the step of obtaining outdoor ambient temperature, the defrost control mode further comprises:
acquiring the coil temperature of the outdoor heat exchanger and the current running time of the refrigerant heating system;
and judging the frost condition of the outdoor heat exchanger according to the temperature of the coil pipe of the outdoor heat exchanger and the current running time of the refrigerant heating system.
7. The defrosting control method according to claim 6, wherein the step of determining the frost condition of the outdoor heat exchanger according to the coil temperature of the outdoor heat exchanger and the current operation duration of the refrigerant heating system specifically includes:
and if the coil temperature of the outdoor heat exchanger is less than or equal to the frost coil temperature and the operation time of the refrigerant heating system is longer than a second preset operation time, determining that frost occurs in the outdoor heat exchanger.
8. A heat pump drying unit is characterized in that the heat pump drying unit comprises a refrigerant heating system and an underground water defrosting system,
the refrigerant heating system comprises a refrigerant circulation loop, and a compressor, an indoor heat exchanger, an electronic expansion valve and an outdoor heat exchanger which are sequentially arranged on the refrigerant circulation loop,
the underground water defrosting system comprises a water supply pipeline and a water supply pump arranged on the water supply pipeline, one end of the water supply pipeline is communicated with underground water, and the water supply pipeline can lead the underground water to the outdoor heat exchanger for defrosting.
9. The heat pump dryer group of claim 8, wherein a cavity is provided at a bottom of the outdoor heat exchanger, and the water supply pipeline is communicated with the cavity to input groundwater into the cavity.
10. The heat pump drying unit according to claim 8, wherein the underground water defrosting system further comprises a water seepage tank, and the other end of the water supply pipeline is communicated with the water seepage tank.
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