CN111829303A - Heat pump tobacco baking system and control method thereof - Google Patents
Heat pump tobacco baking system and control method thereof Download PDFInfo
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- CN111829303A CN111829303A CN202010667232.8A CN202010667232A CN111829303A CN 111829303 A CN111829303 A CN 111829303A CN 202010667232 A CN202010667232 A CN 202010667232A CN 111829303 A CN111829303 A CN 111829303A
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- cavity
- way valve
- mode
- evaporator
- temperature sensor
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Classifications
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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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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/10—Roasting or cooling tobacco
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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
- 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
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/22—Tobacco leaves
Abstract
The invention discloses a heat pump tobacco baking system and a control method thereof, wherein the system is applied to the technical field of heat pumps and comprises an integrated shell and a heat pump system; the heat pump system comprises a condenser, an inner evaporator, an outer evaporator, a controller and a wet-dry bulb temperature sensor, wherein the condenser, the inner evaporator and the outer evaporator are all provided with fans; the integrated shell comprises a first cavity and a second cavity, a dehumidification air door used for communicating the first cavity with the second cavity is arranged between the first cavity and the second cavity, a third cavity communicated with the first cavity is arranged in the first cavity, the inner evaporator is arranged in the third cavity, the first cavity comprises an air inlet and an air outlet, the condenser is arranged in the first cavity, the first cavity is also provided with a cold air door, and the outer evaporator is arranged in the second cavity; the controller determines and executes a control mode according to an output signal of the wet and dry bulb temperature sensor. The invention can be switched between an open-close mode, and is beneficial to adapting to different stages of tobacco leaf baking.
Description
Technical Field
The invention relates to the technical field of heat pumps, in particular to a heat pump tobacco baking system and a control method thereof.
Background
The existing heat pump tobacco curing barn has two common modes, one mode is an open heat pump tobacco curing barn which adopts a cold air door and a moisture removing window to perform forced moisture removing and drying; the other type is a closed heat pump curing barn for dehumidifying and drying by adopting a fully-closed dehumidifying heat pump. However, both open and fully closed curing barn have problems.
The problems of the open type heat pump curing barn are as follows:
when the moisture is exhausted, a large amount of heat needs to be discharged outwards at the same time, and the energy waste is serious. The tobacco leaves can be simultaneously discharged with the moisture removal, so that the fragrance of the baked tobacco leaves is insufficient. When the outside air temperature is low, the energy efficiency of the unit is low, and particularly in the dry muscle period, the temperature rise is difficult.
The problem that the roast room of totally enclosed heat pump exists:
the peak value dehumidification amount per hour is very large in the color fixing period, the dehumidification capacity of the traditional fully-closed heat pump curing barn is difficult to meet the requirement of the peak value dehumidification amount, tobacco leaves are easily cured in a grain way, and the quality of the tobacco leaves is seriously influenced. If the requirement of peak dehumidification is to be met, the configuration of the dehumidification heat pump is much larger than that of the dehumidification heat pump, so that the cost of the system is too high, and the comprehensive popularization of the technology is not facilitated.
Disclosure of Invention
To solve at least one of the above-mentioned technical problems, the present invention is directed to: provided are a heat pump tobacco roasting system and a control method thereof, which can be switched between an open-close type.
In a first aspect, an embodiment of the present invention provides:
a heat pump tobacco baking system comprises an integrated shell and a heat pump system;
the heat pump system comprises a condenser for releasing baking heat, an inner evaporator for dehumidifying, an outer evaporator for absorbing heat, a controller and a wet-dry bulb temperature sensor, wherein the condenser, the inner evaporator and the outer evaporator are all provided with fans;
the integrated shell comprises a first cavity and a second cavity, a moisture exhaust air door used for communicating the first cavity with the second cavity is arranged between the first cavity and the second cavity, a third cavity communicated with the first cavity is arranged in the first cavity, the inner evaporator is arranged in the third cavity, the first cavity comprises an air inlet and an air outlet, the condenser is arranged in the first cavity, the first cavity is also provided with a cold air door, the outer evaporator is arranged in the second cavity, and the second cavity is communicated with the external environment;
the controller determines and executes control modes according to output signals of the wet and dry bulb temperature sensors, wherein the control modes comprise a first mode, a second mode and a third mode;
in a first mode, the controller controls the condenser and the outer evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a second mode, the controller controls the condenser and the outer evaporator to work, and opens the cold air door and the moisture exhaust air door so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a third mode, the controller controls the condenser and the inner evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the inner evaporator absorbs heat and transfers the heat to the condenser.
Further, the heat pump system also comprises a four-way valve, a first electronic expansion valve, a second electronic expansion valve, a compressor, a first one-way valve, a second one-way valve, a gas separator and a liquid storage tank;
the four-way valve comprises a first end, a second end, a third end and a fourth end; when the four-way valve is in a first state, the first end of the four-way valve is connected with the fourth end of the four-way valve, and the second end of the four-way valve is connected with the third end of the four-way valve; when the four-way valve is in a second state, a first end of the four-way valve is connected with a second end of the four-way valve, and a third end of the four-way valve is connected with a fourth end of the four-way valve;
the outlet of the compressor is connected with the inlet of the first one-way valve, the outlet of the first one-way valve is connected with the first end of the four-way valve, the fourth end of the four-way valve is connected with the first end of the condenser, the second end of the condenser is connected with the first end of the liquid storage tank, the second end of the liquid storage tank is connected with the input end of the second one-way valve, the output end of the second one-way valve is respectively connected with the input end of the first electronic expansion valve and the input end of the second electronic expansion valve, the output end of the first electronic expansion valve is connected with the first end of the outer evaporator, the second end of the outer evaporator is connected with the second end of the four-way valve, the output end of the second electronic expansion valve is connected with the first end of the inner evaporator, and the second end of the inner evaporator is respectively connected with the third end of the four-way valve and the, the outlet of the gas separator is connected with the inlet of the compressor;
in a first mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser and the outer evaporator are communicated;
in a second mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser is communicated with the outer evaporator;
in a third mode, the controller controls the compressor to operate, closes the first electronic expansion valve, and opens the second electronic expansion valve such that the condenser and the inner evaporator communicate with each other.
Further, the determining a control mode according to the output signal of the wet and dry bulb temperature sensor specifically includes:
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is less than 40 ℃, determining that the control mode is a first mode;
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is more than or equal to 40 ℃ and less than 50 ℃, determining that the control mode is a second mode;
and when the dry bulb temperature represented by the output signal of the dry-wet bulb temperature sensor is more than or equal to 50 ℃, determining that the control mode is the third mode.
Further, in a second mode, the controller controls the opening degrees of the cold air door and the dehumidifying air door according to the wet bulb temperature represented by the output signal of the dry-wet bulb temperature sensor.
Further, the heat pump system further comprises a first temperature sensor arranged at an outlet of the compressor, a second temperature sensor arranged on the outer evaporator, a third temperature sensor used for measuring the ambient temperature, a fourth temperature sensor arranged at an inlet of the compressor and a fifth temperature sensor arranged on the inner evaporator.
Further, in the third mode, the controller controls the opening degree of the second electronic expansion valve according to a difference between the temperature indicated by the output signal of the fourth temperature sensor and the temperature indicated by the output signal of the fifth temperature sensor.
Further, in a third mode, the controller controls the fan of the inner evaporator according to a first temperature indicated by the output signal of the fifth temperature sensor and a second temperature indicated by the output signal of the first temperature sensor.
Further, when the first temperature is higher than 40 degrees centigrade or the second temperature is higher than 120 degrees centigrade, the frequency of the fan of the inner evaporator is reduced.
Further, the heat pump system further comprises a sensible heat exchanger, and the first chamber and the third chamber are communicated through the sensible heat exchanger.
In a second aspect, an embodiment of the present invention provides:
a control method of a heat pump tobacco baking system comprises the following steps:
acquiring an output signal of a dry-wet bulb temperature sensor;
determining a control mode according to an output signal of the wet and dry bulb temperature sensor;
the control mode is executed.
The embodiment of the invention has the beneficial effects that: the design of integral type has been adopted, set up the hydrofuge air door in the second cavity that outer evaporimeter was located and the first cavity that the condenser goes out, cold air door has been set up on first cavity simultaneously, make in the tobacco leaf stoving stage of difference, the switching of system switching formula can be realized through the switching of control cold air door and hydrofuge air door, thereby compromise baking process and system efficiency, when the system switches to open, can realize a large amount of hydrofuges, outer evaporimeter can absorb the exhaust heat of baking house, thereby increase system efficiency, furthermore, when the system switches to the closed, can utilize interior evaporimeter and condenser to realize the dehumidification of inner loop and dry, can satisfy the demand that the tobacco leaf toasted different stages.
Drawings
FIG. 1 is a schematic structural diagram of a heat pump tobacco curing system according to the present invention;
FIG. 2 is a schematic diagram of a heat pump system provided in accordance with the present invention;
FIG. 3 is an equivalent schematic diagram of a heat pump system provided in accordance with the present invention in first and second modes;
fig. 4 is an equivalent schematic diagram of a heat pump system provided in accordance with the present invention in a third mode;
fig. 5 is a flowchart of a control method of a heat pump system according to the present invention.
Detailed Description
The invention is further described with reference to the drawings and the specific examples.
Referring to fig. 1, the present embodiment discloses a heat pump tobacco roasting system, which includes an integrated housing 100 and a heat pump system. It is to be understood that a one-piece housing refers to a housing for mounting one piece of a heat pump system.
The heat pump system comprises a condenser 111 for releasing baking heat, an inner evaporator 131 for dehumidification and an outer evaporator 121 for absorbing heat, wherein the condenser 111 is provided with a fan 112, the inner evaporator 131 is provided with a fan 132, and the outer evaporator 121 is provided with a fan 122, a dry-wet bulb temperature sensor and a controller.
It is to be understood that the heat pump system includes components such as a compressor, piping and valves, and that the functions of both baking and dehumidifying can be achieved by configuring the compressor, piping and valves in conjunction with the internal and external evaporators and condensers.
The integrated shell 100 comprises a first chamber 110 and a second chamber 120, a dehumidifying air door 140 used for communicating the first chamber 110 with the second chamber 120 is arranged between the first chamber 110 and the second chamber 120, a third chamber 130 communicated with the first chamber 110 is arranged in the first chamber 110, an inner evaporator 131 is arranged in the third chamber 130, the first chamber 110 comprises an air inlet 115 and an air outlet 114, a condenser 111 is arranged in the first chamber 110, the first chamber 110 is further provided with a cold air door 113, an outer evaporator 121 is arranged in the second chamber 120, and the second chamber 120 is communicated with the external environment.
In addition, in the present embodiment, a space for placing the compressor 150 of the heat pump system is further provided, and is located in the second chamber 120.
Wherein the third chamber 130 is further provided with a sensible heat exchanger 133, which functions to allow the gas to enter the third chamber 130 and then to flow out through the inner evaporator 131, so that moisture in the air can be taken away. It is to be understood that the sensible heat exchanger 133 can be provided to improve the dehumidification efficiency, but other configurations of air ducts using the same principles can also achieve the dehumidification function.
The controller determines and executes control modes according to output signals of the wet and dry bulb temperature sensors, wherein the control modes comprise a first mode, a second mode and a third mode;
in a first mode, the controller controls the condenser and the outer evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a second mode, the controller controls the condenser and the outer evaporator to work, and opens the cold air door and the moisture exhaust air door so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a third mode, the controller controls the condenser and the inner evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the inner evaporator absorbs heat and transfers the heat to the condenser.
It is to be understood that the tobacco leaf curing process usually includes several stages, in the first stage, referred to as a yellowing stage, a low-temperature and high-humidity curing condition is often required, generally, the dry bulb temperature is 38-40 ℃ and the wet bulb temperature is 37-38 ℃, and the temperature is controlled by directly adopting a heat pump heating mode in this stage. At this time, the first mode is adopted, the interior of the baking room is heated by using outdoor heat, so that the temperature can be raised, and meanwhile, indoor moisture cannot be discharged.
In the second stage, from the later stage of the yellowing period to the middle stage of the fixing period, the dry bulb temperature is required to be gradually increased from 40 ℃ to 50 ℃, and the wet bulb temperature is basically maintained at about 39 ℃, so that the stage is often a large moisture removal stage, much moisture needs to be removed every hour, and the stage can be baked by adopting a heating and moisture removal mode. Can solve the closed and toast the problem that dehumidification ability is not enough, open the cold wind door, external dry new trend will be in getting into roast room under circulating fan's attraction, open the hydrofuge air door, after the outer evaporimeter of high temperature and high humidity air in the roast room will discharge, is discharged the external world after the evaporimeter earlier under the effect of outer evaporimeter fan, therefore the exhaust heat major part can be retrieved by outer evaporimeter. The heating energy efficiency ratio of the heat pump is improved. At this stage, most of the moisture discharged from the tobacco leaves is intercellular free water, so that excessive fragrance substances are not volatilized, and the fragrance of the tobacco leaves is not influenced.
In the third stage, when the dry bulb temperature reaches 50-68 ℃, the moisture-removing capacity required per hour is not high because much free water is removed in the early stage. And the energy efficiency ratio of the heating + dehumidifying mode becomes very low due to further increase of the condensing temperature. Therefore, the fan of the outer evaporator is closed, the fan of the inner evaporator is opened, the evaporator is switched into the inner evaporator from the outer evaporator, and the cold air door and the dehumidifying air door are closed simultaneously, so that the closed dehumidifying and baking are realized. Because the temperature in the curing barn is very high, the invention adopts a special compressor with high evaporation temperature. The highest evaporation temperature can reach 40 ℃, compared with the highest evaporation temperature of 25 ℃ of the traditional compressor, the operation range is wider, and meanwhile, due to the reduction of the compression ratio, the energy efficiency ratio is higher, and the energy is saved more. At this stage, the fragrant substances in the tobacco leaves are gradually released, if a traditional open system is adopted, the fragrant substances are completely discharged, and the closed baking is switched at the moment, so that the problem can be effectively solved, the effects of keeping fragrance and increasing aroma and improving the quality of the tobacco leaves are realized. Meanwhile, due to the improvement of the evaporation temperature, the energy efficiency ratio is greatly improved, and compared with an open system, the heating effect is better and the energy is more saved.
In addition, this scheme passes through the structural design of integral type, and the installation that can be very convenient is in roast room, wherein, sets up the air intake 115 and the air outlet 114 of first cavity 110 in roast room when the installation, and cold wind door 113 sets up outside roast room, and in addition, the second cavity communicates with external environment.
Referring to fig. 2, in some embodiments, the heat pump system further includes a four-way valve, a first electronic expansion valve, a second electronic expansion valve, a compressor, a first one-way valve, a second one-way valve, a gas separator, and a liquid reservoir.
The four-way valve comprises a first end, a second end, a third end and a fourth end; when the four-way valve is in a first state, the first end of the four-way valve is connected with the fourth end of the four-way valve, and the second end of the four-way valve is connected with the third end of the four-way valve; and when the four-way valve is in a second state, the first end of the four-way valve is connected with the second end of the four-way valve, and the third end of the four-way valve is connected with the fourth end of the four-way valve. The two states of the four-way valve are normally switched on and off.
The outlet of the compressor is connected with the inlet of the first one-way valve, the outlet of the first one-way valve is connected with the first end of the four-way valve, the fourth end of the four-way valve is connected with the first end of the condenser, the second end of the condenser is connected with the first end of the liquid storage tank, the second end of the liquid storage tank is connected with the input end of the second one-way valve, the output end of the second one-way valve is respectively connected with the input end of the first electronic expansion valve and the input end of the second electronic expansion valve, the output end of the first electronic expansion valve is connected with the first end of the outer evaporator, the second end of the outer evaporator is connected with the second end of the four-way valve, the output end of the second electronic expansion valve is connected with the first end of the inner evaporator, and the second end of the inner evaporator is respectively connected with the third end of the four-way valve and the, the outlet of the gas separator is connected with the inlet of the compressor.
It should be understood that different functions can be realized by changing the communication states of the four-way valve, the first electronic expansion valve and the second electronic expansion valve. The filter is arranged to prevent the pipeline from being blocked, the outer evaporator is connected with the air separator through the four-way valve and then returns to the compressor, and hot air can accurately enter the outer evaporator during defrosting.
In a first mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser and the outer evaporator are communicated;
in a second mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser is communicated with the outer evaporator;
in a third mode, the controller controls the compressor to operate, closes the first electronic expansion valve, and opens the second electronic expansion valve such that the condenser and the inner evaporator communicate with each other.
In some embodiments, the determining a control mode according to the output signal of the wet and dry bulb temperature sensor specifically includes:
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is less than 40 ℃, determining that the control mode is a first mode;
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is more than or equal to 40 ℃ and less than 50 ℃, determining that the control mode is a second mode;
and when the dry bulb temperature represented by the output signal of the dry-wet bulb temperature sensor is more than or equal to 50 ℃, determining that the control mode is the third mode.
The baking of the tobacco leaves is controlled through the process parameters, the tobacco leaves are not easy to bake lees, and the tobacco leaves with better quality can be baked.
Referring to fig. 3, in the first mode, the four-way valve is in a power-off state, the first end of the four-way valve is connected with the fourth end of the four-way valve, the first electronic expansion valve is opened, the second electronic expansion valve is closed, and the cold air door and the dehumidifying air door are both closed. At this time, as shown in fig. 3, the compressor compresses the refrigerant gas to produce high-temperature and high-pressure refrigerant gas, the refrigerant gas passes through the first one-way valve and the four-way valve and flows through the condenser to release heat, and as a heat source of the curing barn, the refrigerant gas is cooled into refrigerant liquid, then the refrigerant liquid enters the liquid storage tank, then flows to the first electronic expansion valve through the filter and the second one-way valve, and then enters the outer evaporator, and after the outer evaporator absorbs external heat, the liquid refrigerant is evaporated into gas and then enters the compressor again.
In the second mode, the schematic diagram of the heat pump system is the same as that in fig. 3, and the moisture exhaust air door and the cold air door can be opened, so that a large amount of moisture can be exhausted, and the heat of the air in the curing barn can be recycled.
Referring to fig. 4, in the third mode, the four-way valve is in a power-off state, the first end of the four-way valve and the fourth end of the four-way valve are connected, and simultaneously, the first electronic expansion valve is closed, the second electronic expansion valve is opened, and the dehumidification damper and the cold air door are closed. At this time, as shown in fig. 4, the compressor compresses the refrigerant gas to produce high-temperature and high-pressure refrigerant gas, the refrigerant gas passes through the first one-way valve and the four-way valve and flows through the condenser to release heat, which is used as a heat source of the curing barn and is cooled into refrigerant liquid, then the refrigerant liquid enters the liquid storage tank, then flows to the second electronic expansion valve through the filter and the second one-way valve, and then enters the internal evaporator, the refrigerant liquid is evaporated into gas after absorbing the heat of the internally circulating humid air in the internal evaporator, and the moisture in the air is condensed into liquid in the heat absorbing process, thereby realizing dehumidification. Finally, the refrigerant gas reenters the compressor through the gas separation device.
In some embodiments, the air inlet is disposed at a side of the first chamber, and the air outlet is disposed at a top of the first chamber. Generally, the hot gas rises, and the arrangement conforms to the movement law of the gas.
In some embodiments, the heat pump system further comprises a first temperature sensor disposed at an outlet of the compressor, a second temperature sensor disposed on the outer evaporator, a third temperature sensor for measuring ambient temperature, a fourth temperature sensor disposed at an inlet of the compressor, and a fifth temperature sensor disposed on the inner evaporator. These temperature sensors may be configured to provide a control basis for the controller.
In some embodiments, in the third mode, the controller controls the opening degree of the second electronic expansion valve according to a difference between a temperature indicated by the output signal of the fourth temperature sensor and a temperature indicated by the output signal of the fifth temperature sensor.
In the present embodiment, the fifth temperature sensor detects the evaporation temperature, the fourth temperature sensor detects the return air temperature, and the degree of superheat is defined as the return air temperature — the evaporation temperature, and the degree of superheat can be adjusted by adjusting the opening degree of the second electronic expansion valve.
In some embodiments, in the third mode, the controller controls the fan of the inner evaporator according to a first temperature indicated by the output signal of the fifth temperature sensor and a second temperature indicated by the output signal of the first temperature sensor. Specifically, when the first temperature is higher than 40 degrees celsius or the second temperature is higher than 120 degrees celsius, the frequency of the fan of the inner evaporator is reduced.
In this embodiment, since the compressor may be damaged due to an excessively high temperature of the inner evaporator, the frequency of the dehumidifying fan is controlled by detecting the first temperature and the second temperature to ensure that the compressor is not damaged. It should be understood that the threshold values of the first and second temperatures may be further adjusted up after the capacity of the compressor is increased. Therefore, the frequency conversion mode is adopted to control the fan of the inner evaporator, and the evaporation temperature of the inner evaporator can be effectively controlled.
In some embodiments, in the second mode, the controller controls the opening degrees of the cool air door and the dehumidifying damper according to a wet bulb temperature indicated by an output signal of the dry-wet bulb temperature sensor.
When the difference between the wet bulb temperature and the target wet bulb temperature is smaller, the opening degree of the cold air door and the dehumidifying air door can be increased relatively when the difference between the wet bulb temperature and the target wet bulb temperature is larger.
Referring to fig. 5, the embodiment discloses a control method of a heat pump tobacco baking system, which is applied to a controller of the heat pump tobacco baking system, and includes the following steps:
and step 510, acquiring an output signal of the wet and dry bulb temperature sensor.
The controller obtains the output signal of the dry-wet bulb temperature sensor from the output end of the dry-wet bulb temperature sensor, and performs analog-to-digital conversion and proportion conversion.
And step 520, determining a control mode according to the output signal of the wet and dry bulb temperature sensor.
And determining whether the control mode is the first mode, the second mode or the third mode according to the dry-bulb temperature converted from the output signal of the dry-wet-bulb temperature sensor.
And then, controlling the compressor, the electronic expansion valve, the fan of the inner evaporator, the fan of the outer evaporator, the fan of the condenser, the moisture exhaust air door and the cold air door.
The step numbers in the above method embodiments are set for convenience of illustration only, the order between the steps is not limited at all, and the execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A heat pump tobacco baking system is characterized by comprising an integrated shell and a heat pump system;
the heat pump system comprises a condenser for releasing baking heat, an inner evaporator for dehumidifying, an outer evaporator for absorbing heat, a controller and a wet-dry bulb temperature sensor, wherein the condenser, the inner evaporator and the outer evaporator are all provided with fans;
the integrated shell comprises a first cavity and a second cavity, a moisture exhaust air door used for communicating the first cavity with the second cavity is arranged between the first cavity and the second cavity, a third cavity communicated with the first cavity is arranged in the first cavity, the inner evaporator is arranged in the third cavity, the first cavity comprises an air inlet and an air outlet, the condenser is arranged in the first cavity, the first cavity is also provided with a cold air door, the outer evaporator is arranged in the second cavity, and the second cavity is communicated with the external environment;
the controller determines and executes control modes according to output signals of the wet and dry bulb temperature sensors, wherein the control modes comprise a first mode, a second mode and a third mode;
in a first mode, the controller controls the condenser and the outer evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a second mode, the controller controls the condenser and the outer evaporator to work, and opens the cold air door and the moisture exhaust air door so that the outer evaporator absorbs heat and transfers the heat to the condenser;
in a third mode, the controller controls the condenser and the inner evaporator to work, and the cold air door and the moisture exhaust air door are closed, so that the inner evaporator absorbs heat and transfers the heat to the condenser.
2. The heat pump tobacco curing system of claim 1, wherein the heat pump system further comprises a four-way valve, a first electronic expansion valve, a second electronic expansion valve, a compressor, a first one-way valve, a second one-way valve, a gas separator, and a liquid reservoir;
the four-way valve comprises a first end, a second end, a third end and a fourth end; when the four-way valve is in a first state, the first end of the four-way valve is connected with the fourth end of the four-way valve, and the second end of the four-way valve is connected with the third end of the four-way valve; when the four-way valve is in a second state, a first end of the four-way valve is connected with a second end of the four-way valve, and a third end of the four-way valve is connected with a fourth end of the four-way valve;
the outlet of the compressor is connected with the inlet of the first one-way valve, the outlet of the first one-way valve is connected with the first end of the four-way valve, the fourth end of the four-way valve is connected with the first end of the condenser, the second end of the condenser is connected with the first end of the liquid storage tank, the second end of the liquid storage tank is connected with the input end of the second one-way valve, the output end of the second one-way valve is respectively connected with the input end of the first electronic expansion valve and the input end of the second electronic expansion valve, the output end of the first electronic expansion valve is connected with the first end of the outer evaporator, the second end of the outer evaporator is connected with the second end of the four-way valve, the output end of the second electronic expansion valve is connected with the first end of the inner evaporator, and the second end of the inner evaporator is respectively connected with the third end of the four-way valve and the, the outlet of the gas separator is connected with the inlet of the compressor;
in a first mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser and the outer evaporator are communicated;
in a second mode, the controller controls the compressor to work, opens the first electronic expansion valve and closes the second electronic expansion valve, so that the condenser is communicated with the outer evaporator;
in a third mode, the controller controls the compressor to operate, closes the first electronic expansion valve, and opens the second electronic expansion valve such that the condenser and the inner evaporator communicate with each other.
3. The heat pump tobacco baking system of claim 1, wherein determining a control mode based on the output signal of the wet and dry bulb temperature sensor comprises:
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is less than 40 ℃, determining that the control mode is a first mode;
when the dry bulb temperature represented by the output signal of the dry bulb and wet bulb temperature sensor is more than or equal to 40 ℃ and less than 50 ℃, determining that the control mode is a second mode;
and when the dry bulb temperature represented by the output signal of the dry-wet bulb temperature sensor is more than or equal to 50 ℃, determining that the control mode is the third mode.
4. The heat pump tobacco curing system of claim 1, wherein in the second mode, the controller controls the opening of the cool air door and the moisture exhaust door based on a wet bulb temperature indicated by an output signal of the dry-wet bulb temperature sensor.
5. The heat pump tobacco curing system of claim 2 further comprising a first temperature sensor disposed at an outlet of the compressor, a second temperature sensor disposed on the outer evaporator, a third temperature sensor for measuring ambient temperature, a fourth temperature sensor disposed at an inlet of the compressor, and a fifth temperature sensor disposed on the inner evaporator.
6. The heat pump tobacco roasting system of claim 5, wherein in a third mode, said controller controls an opening degree of said second electronic expansion valve according to a difference between a temperature indicated by an output signal of said fourth temperature sensor and a temperature indicated by an output signal of said fifth temperature sensor.
7. The heat pump tobacco roasting system of claim 5, wherein in a third mode, said controller controls said fan of said inner evaporator according to a first temperature represented by an output signal of said fifth temperature sensor and a second temperature represented by an output signal of said first temperature sensor.
8. The heat pump tobacco curing system of claim 7 wherein the frequency of the fan of the inner evaporator is reduced when the first temperature is greater than 40 degrees celsius or the second temperature is greater than 120 degrees celsius.
9. The heat pump tobacco curing system of claim 1 further comprising a sensible heat exchanger, wherein the first and third chambers are in communication through the sensible heat exchanger.
10. A control method of a heat pump tobacco baking system is characterized by comprising the following steps:
acquiring an output signal of a dry-wet bulb temperature sensor;
determining a control mode according to an output signal of the wet and dry bulb temperature sensor;
the control mode is executed.
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| CN202010667232.8A CN111829303A (en) | 2020-07-13 | 2020-07-13 | Heat pump tobacco baking system and control method thereof |
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| CN112352991A (en) * | 2020-11-18 | 2021-02-12 | 青岛海信日立空调系统有限公司 | Tobacco dryer and control method for electric heating of tobacco dryer |
| CN112401288A (en) * | 2020-12-04 | 2021-02-26 | 贵州省烟草科学研究院 | Tobacco leaf humidity control oven with double-humidity-control structure and control method thereof |
| CN112460935A (en) * | 2020-11-30 | 2021-03-09 | 广州热之源科技有限公司 | Heat pump dryer and control method of electronic expansion valve thereof |
| CN112568482A (en) * | 2020-11-18 | 2021-03-30 | 青岛海信日立空调系统有限公司 | Tobacco dryer and tobacco dryer control method |
| CN113324380A (en) * | 2021-06-08 | 2021-08-31 | 常州恒创热管理有限公司 | Air source heat pump type drying room |
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| CN114115405A (en) * | 2021-12-10 | 2022-03-01 | 华南农业大学 | Multi-section type tobacco leaf drying automatic control system and method |
| CN114294942A (en) * | 2021-12-23 | 2022-04-08 | 珠海格力电器股份有限公司 | Heat pump drying system and control method thereof |
| CN114370746A (en) * | 2022-01-13 | 2022-04-19 | 珠海格力电器股份有限公司 | Heat pump type tobacco dryer and control method thereof |
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