CN112352991B - Tobacco dryer and control method for electric heating of tobacco dryer - Google Patents
Tobacco dryer and control method for electric heating of tobacco dryer Download PDFInfo
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- CN112352991B CN112352991B CN202011295557.4A CN202011295557A CN112352991B CN 112352991 B CN112352991 B CN 112352991B CN 202011295557 A CN202011295557 A CN 202011295557A CN 112352991 B CN112352991 B CN 112352991B
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- 241000208125 Nicotiana Species 0.000 title claims abstract description 137
- 235000002637 Nicotiana tabacum Nutrition 0.000 title claims abstract description 137
- 238000005485 electric heating Methods 0.000 title claims abstract description 56
- 238000001035 drying Methods 0.000 claims abstract description 97
- 238000010438 heat treatment Methods 0.000 claims abstract description 50
- 230000000875 corresponding Effects 0.000 claims abstract description 13
- 238000007791 dehumidification Methods 0.000 claims description 27
- 238000007599 discharging Methods 0.000 claims description 15
- 238000010792 warming Methods 0.000 claims description 11
- 230000001276 controlling effect Effects 0.000 claims description 9
- 230000000630 rising Effects 0.000 description 9
- 230000000087 stabilizing Effects 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000002035 prolonged Effects 0.000 description 2
- 210000001736 Capillaries Anatomy 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000000391 smoking Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- A24B3/04—Humidifying or drying tobacco bunches or cut tobacco
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
The invention discloses a tobacco dryer and a control method for electric heating of the tobacco dryer, wherein the tobacco dryer comprises an indoor unit and a control unit, wherein the indoor unit comprises an indoor heat exchanger which is used as a condenser to work; an outdoor unit including a compressor and an outdoor heat exchanger operating as an evaporator; an indoor temperature sensor for detecting an indoor ambient temperature; an outdoor temperature sensor for detecting an outdoor ambient temperature; the PTC electric heating module is arranged on the indoor unit and used for heating the drying chamber; a controller configured to: determining the mode required heat corresponding to the operation mode of the tobacco dryer according to the first temperature difference and the second temperature difference; determining the required heat for drying the tobacco according to the absorbed heat of the tobacco and the required heat of the mode; the compressor and the PTC electric heating module are controlled to be opened based on the tobacco drying heat demand, so that the phenomenon that the compressor is frequently started and stopped is reduced, and the service life of the compressor is guaranteed.
Description
Technical Field
The application relates to the field of tobacco drying, in particular to a tobacco dryer and a control method for electric heating of the tobacco dryer.
Background
At present, many people have a habit of smoking, and tobacco needs to be processed through a plurality of working procedures for changing into cigarettes which are purchased by consumers at last, wherein the tobacco drying is an essential working procedure in the tobacco production process.
The existing air source heat pump drying machine adopts a fixed-frequency compressor, when a drying chamber needs to be heated, the compressor is started to heat with fixed power, the interior of a baking room quickly reaches a target temperature, the compressor is closed at the moment, and when the temperature in the baking room is reduced to a certain temperature, the compressor is restarted to heat, so that the cycle is carried out. When the moisture discharging amount is particularly large, the temperature in the baking room is reduced very fast, and the compressor is started and stopped once in four or five minutes. Frequent start and stop of the compressor can damage the compressor, reduce the service life of the compressor and influence the operation safety of the heat pump dryer. And the temperature in the drying chamber fluctuates repeatedly and frequently, which has certain influence on the quality of the tobacco leaves.
Therefore, how to reduce the occurrence of the frequent start-stop phenomenon of the compressor and ensure the service life of the compressor and the operation safety of the heat pump dryer is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a tobacco dryer, which is used for solving the technical problem that the service life of a compressor cannot be ensured in the prior art, and comprises:
the indoor unit comprises an indoor heat exchanger which works as a condenser and is used for providing heat for the drying chamber;
an outdoor unit including a compressor and an outdoor heat exchanger operating as an evaporator;
an indoor temperature sensor for detecting an indoor ambient temperature;
an outdoor temperature sensor for detecting an outdoor ambient temperature;
the PTC electric heating module is arranged on the indoor unit and is used for heating the drying chamber;
a controller configured to:
determining mode required heat corresponding to the operation mode of the tobacco dryer according to the first temperature difference and the second temperature difference;
determining the required tobacco drying heat according to the absorbed tobacco heat and the mode required heat;
controlling the compressor and the PTC electrical heating module to be turned on based on the tobacco drying demand heat;
wherein the first temperature difference is a difference between the indoor ambient temperature and the outdoor ambient temperature, and the second temperature difference is a difference between a target ambient temperature and the indoor ambient temperature;
the heat absorbed by the tobacco is determined according to the target environment temperature and the indoor environment temperature;
the operation modes comprise a temperature-stabilizing and humidity-discharging-free mode, a temperature-stabilizing and humidity-discharging mode, a temperature-rising and humidity-discharging-free mode and a temperature-rising and humidity-discharging mode.
In some embodiments, the controller is configured to:
when the required heat for drying the tobacco is greater than or equal to a preset threshold value, starting the compressor and closing the PTC electric heating module;
and when the required heat for drying the tobacco is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
In some embodiments, the controller is configured to:
when the operation mode is a temperature-stabilizing and humidity-discharging-free mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a warming and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the warming heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference, and the warming heat amount is determined based on the second temperature difference.
In some embodiments, the natural leakage heat is obtained by the following equation:
natural leakage heat = leakage coefficient × (first temperature difference);
wherein the leakage coefficient is constant.
In some embodiments, the heat of moisture removal is obtained by the following formula:
the heat of dehumidification = damper coefficient angle coefficient a first temperature difference;
and the air level coefficient and the air door angle coefficient are constants.
In some embodiments, the warming heat is obtained by the following equation:
heating heat = drying chamber coefficient wind shield coefficient second temperature difference;
wherein the drying chamber coefficient and the damper coefficient are constants.
In some embodiments, the tobacco drying demand heat is obtained by the following formula:
Q general (1) ＝A*(T Target —T Indoor )+B*Q；
Wherein Q General assembly The heat required for said tobacco drying, Q said mode heat required, A x (Ttarget-Tchamber) representing the heat absorbed by said tobacco, A and B constant coefficients, T Target Is the target ambient temperature, T Indoor Is the indoor ambient temperature.
Correspondingly, the invention also provides a control method for electric heating of the tobacco dryer, which is applied to the tobacco dryer comprising an indoor unit, an outdoor unit, an indoor temperature sensor, an outdoor temperature sensor, a PTC electric heating module and a controller, and comprises the following steps:
determining a mode required heat corresponding to an operation mode of the tobacco dryer according to a first temperature difference value and a second temperature difference value, wherein the first temperature difference value is a difference value between the indoor environment temperature and the outdoor environment temperature, the second temperature difference value is a difference value between a target environment temperature and the indoor environment temperature, and the operation mode comprises a temperature-stabilizing and humidity-discharging-free mode, a temperature-stabilizing and humidity-discharging mode, a temperature-rising and humidity-discharging-free mode and a temperature-rising and humidity-discharging mode;
determining tobacco drying required heat according to the tobacco absorbed heat and the mode required heat, wherein the tobacco absorbed heat is determined according to the target environment temperature and the indoor environment temperature;
controlling the compressor and the PTC electrical heating module to be turned on based on the required heat for drying the tobacco.
In some embodiments, the compressor and the PTC electric heating module are controlled to be turned on based on the required heat for tobacco drying, specifically:
when the required heat for drying the tobacco is greater than or equal to a preset threshold value, starting the compressor and closing the PTC electric heating module;
and when the required tobacco drying heat is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
In some embodiments, determining a mode required heat corresponding to an operation mode of the tobacco dryer according to the first temperature difference and the second temperature difference specifically includes:
when the operation mode is a temperature-stabilizing and humidity-non-discharging mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a warming and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the warming heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference, and the warming heat amount is determined based on the second temperature difference.
Compared with the prior art, the method has the following beneficial effects:
the invention discloses a tobacco dryer and a control method for electric heating of the tobacco dryer, wherein the tobacco dryer comprises an indoor unit, a heat exchanger, a heat pump and a control device, wherein the indoor unit comprises an indoor heat exchanger which works as a condenser and is used for providing heat for a drying chamber; an outdoor unit including a compressor and an outdoor heat exchanger operating as an evaporator; an indoor temperature sensor for detecting an indoor ambient temperature; an outdoor temperature sensor for detecting an outdoor ambient temperature; the PTC electric heating module is arranged on the indoor unit and is used for heating the drying chamber; a controller configured to: determining the mode required heat of the dryer according to the operation mode of the tobacco dryer, the first temperature difference value and the second temperature difference value; determining the required heat for drying the tobacco according to the absorbed heat of the tobacco and the required heat of the mode; the compressor and the PTC electric heating module are controlled to be opened based on the tobacco drying demand heat, so that the phenomenon that the compressor is frequently started and stopped is reduced, the service life of the compressor is prolonged, and the operation safety of the heat pump dryer is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic configuration view illustrating a tobacco dryer of an embodiment;
FIG. 2 is a schematic view illustrating the operation of the tobacco dryer of the embodiment;
fig. 3 is a schematic flow chart of a control method for electric heating of a tobacco dryer according to an embodiment of the present application.
Description of the reference symbols
1. The device comprises a compressor 2, a high-pressure sensor 3, a stop valve 4, a stop valve 5, a filter 6, an electronic expansion valve 7, a flow dividing head 8, an outdoor heat exchanger 9, a detection joint 10, a gas-liquid separator 11, a filter 12, a low-pressure sensor 13, a capillary tube 14, an electromagnetic valve 15, a filter 16, an indoor heat exchanger 17, a PTC electric heating module 18, an indoor unit 19, an outdoor unit 20, a circulating fan 21, a fresh air inlet 22, a heating chamber 23, a drying chamber 24 and a moisture exhaust port.
1. Detailed description of the preferred embodiments
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In the embodiment of the application, the tobacco dryer provides heat for the drying chamber through the indoor unit and the PTC (Positive Temperature Coefficient) electric heating module, when heat is provided by the indoor unit, the indoor heat exchanger works as a condenser to provide heat, and the outdoor heat exchanger works as an evaporator; when heat is supplied through the PTC electric heating module, the indoor unit can stop working. Therefore, the indoor unit and the PTC electric heating module are alternately used, the starting and stopping times of the compressor can be reduced, and the service life of the compressor is ensured.
As shown in fig. 1 and 2, the PTC electric heating module 17 is installed on the indoor unit 18, and the indoor unit 18 is installed in the heating chamber 22 for supplying heat to the drying chamber 23; the outdoor unit 19 is connected with the indoor unit 18; the circulating fan 20 is installed above the indoor unit 18 and used for transferring heat to the drying chamber 23 and enabling the temperature in the drying chamber 23 to be uniformly distributed; tobacco is placed in the drying chamber 23; the opening angle of the new air door 21 can be adjusted, and outdoor air is controlled to enter the heating chamber 22 and then reach the drying chamber 23; after fresh air enters the moisture exhaust port 24, the moisture exhaust port 24 is automatically opened under the action of pressure to exhaust moisture from the drying chamber 23; the indoor unit includes an indoor heat exchanger 16, the outdoor unit includes a compressor 1 and an outdoor heat exchanger 8, and a refrigerant medium circulates between the indoor unit 18 and the outdoor unit 19.
To further illustrate aspects of the present application, in one example of the present application, the tobacco dryer comprises:
an indoor unit 18 including an indoor heat exchanger 16 operating as a condenser for supplying heat to the drying chamber;
an outdoor unit 19 including a compressor 1 and an outdoor heat exchanger 8 operating as an evaporator;
an indoor temperature sensor for detecting an indoor ambient temperature;
an outdoor temperature sensor for detecting an outdoor ambient temperature;
the PTC electric heating module 17 is arranged on the indoor unit 18 and used for heating the drying chamber;
a controller configured to:
determining mode required heat corresponding to the operation mode of the tobacco dryer according to the first temperature difference and the second temperature difference;
determining the required heat for drying the tobacco according to the absorbed heat of the tobacco and the required heat of the mode;
controlling the compressor and the PTC electrical heating module to be turned on based on the tobacco drying demand heat;
wherein the first temperature difference is a difference between the indoor ambient temperature and the outdoor ambient temperature, and the second temperature difference is a difference between a target ambient temperature and the indoor ambient temperature;
the heat absorbed by the tobacco is determined according to the target environment temperature and the indoor environment temperature;
the operation modes comprise a temperature-stabilizing and humidity-discharging-free mode, a temperature-stabilizing and humidity-discharging mode, a temperature-rising and humidity-discharging-free mode and a temperature-rising and humidity-discharging mode.
In this embodiment, the drying process is mainly divided into a temperature stabilizing stage and a temperature rising stage, and the fresh air door is indirectly opened to perform dehumidification in both the temperature stabilizing stage and the temperature rising stage, so that the operation modes of the tobacco dryer include a temperature stabilizing non-dehumidification mode, a temperature stabilizing dehumidification mode, a temperature rising non-dehumidification mode and a temperature rising dehumidification mode. Determining the mode required heat of the tobacco dryer under different operation modes according to a first temperature difference value and a second temperature difference value, wherein the first temperature difference value is the difference value between the indoor environment temperature and the outdoor environment temperature, and the second temperature difference value is the difference value between the target environment temperature and the indoor environment temperature; the target ambient temperature may be set by user requirements. Alternatively, the target ambient temperature may be set by the user through a remote control. After determining the mode required heat, determining the tobacco drying required heat according to the tobacco absorbed heat and the mode required heat, wherein the tobacco absorbed heat is determined according to the target environment temperature and the indoor environment temperature; and finally, controlling the compressor and the PTC electric heating module to be started according to the heat required by the tobacco drying.
In order to accurately control the opening of the compressor and PTC electrical heating module, in some embodiments, the controller is configured to:
when the required heat for drying the tobacco is greater than or equal to a preset threshold value, starting the compressor and closing the PTC electric heating module;
and when the required heat for drying the tobacco is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
In the embodiment, a compressor and a PTC electric heating module work alternately to provide heat for a drying chamber, when the required heat for drying the tobacco is greater than or equal to a preset threshold value, the required heat value is higher, an indoor and outdoor machine circulating system where the compressor is located is adopted to provide heat, the compressor is started, and the PTC electric heating module is closed; the preset threshold value can be set according to actual conditions, and optionally, the preset threshold value can be set by referring to the power of the PTC electric heating module. And when the required heat of the tobacco drying is smaller than a preset threshold value, the required heat value is less, and the PTC electric heating module is started and the compressor is closed. By the control, the occurrence of frequent start-stop phenomena can be reduced, and the service life of the compressor and the operation safety of the heat pump dryer are ensured.
It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and other methods for controlling the opening of the compressor and the PTC electric heating module are within the protection scope of the present application.
In order to accurately determine the mode demand heat corresponding to the operating mode of the tobacco dryer, in some embodiments, the controller is configured to:
when the operation mode is a temperature-stabilizing and humidity-non-discharging mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference, and the warming heat amount is determined based on the second temperature difference.
In the embodiment, the natural leakage heat is mainly heat which is transferred to the outside through the wall body of the drying chamber to cause partial heat to be lost and considered, the natural leakage heat is determined according to the first temperature difference, the dehumidifying heat is mainly heat which is introduced into outdoor low-temperature dry air from a new air door and is high-temperature humid air discharged from a dehumidifying port, the humidity of a wet bulb in the drying chamber is reduced, and meanwhile, partial heat is also discharged. The dehumidification heat is determined according to the first temperature difference, the heating heat is the heat required by the drying chamber to be heated from the current actual indoor environment temperature to the target environment temperature in the heating process, and the heating heat is determined according to the second temperature difference. When the operation mode is a temperature-stabilizing and humidity-non-discharging mode, the mode required heat is natural leakage heat; when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat; when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat; when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat.
It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and other methods for determining the mode required heat based on different operation modes all belong to the protection scope of the present application.
In order to accurately derive the natural leakage heat, in some embodiments, the natural leakage heat is obtained by the following formula:
natural leakage heat = leakage coefficient × (first temperature difference);
wherein the leakage coefficient is constant.
In this embodiment, the leakage coefficient is a constant, and may be obtained through experiments, and optionally, the leakage coefficient is determined by the wall material, the thickness, and other factors of the drying chamber.
It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and other methods for determining the natural leakage heat are all within the protection scope of the present application.
In order to accurately obtain the heat of humidity removal, in some embodiments, the heat of humidity removal is obtained by the following formula:
the heat of dehumidification = damper coefficient angle coefficient a first temperature difference;
and the wind gear coefficient and the wind door angle coefficient are constants.
In this embodiment, the air level coefficient is a constant, and can be obtained through experiments, the high level, the middle level, and the low level of the fan correspond to different coefficients, and the air door angle coefficient is a constant, and can be obtained through experiments, and because the air door is opened by 15 °, 30 °, 45 °, 60 °, 75 °, and 90 ° respectively, the air inlet amount is different, and thus the air door angle coefficient corresponds to different air door angle coefficients.
It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and other methods for determining the heat of humidity removal are all within the protection scope of the present application.
In order to accurately obtain the temperature-increasing heat, in some embodiments, the temperature-increasing heat is obtained by the following formula:
heating heat = drying chamber coefficient wind shield coefficient second temperature difference;
and the coefficient of the drying chamber and the coefficient of the wind level coefficient are constants.
In this embodiment, the damper coefficient is consistent with the above, and the drying chamber coefficient is a constant, which can be obtained through experiments, and optionally, the drying chamber coefficient is determined by the volume of the drying chamber and the total weight of the tobacco.
It should be noted that the above solution of the preferred embodiment is only one specific implementation solution proposed in the present application, and other methods for determining the temperature rise heat are all within the protection scope of the present application.
In order to accurately obtain the required tobacco drying heat, in some embodiments, the required tobacco drying heat is obtained by the following formula:
Q general (1) ＝A*(T Target —T Indoor use )+B*Q
Wherein Q is General assembly The heat required for said tobacco drying, Q said mode heat required, A x (Ttarget-Tchamber) representing the heat absorbed by said tobacco, A and B constant coefficients, T Target Is the target ambient temperature, T Indoor Is the indoor ambient temperature.
In this embodiment, the heat absorbed by the tobacco is the heat absorbed by the moisture in the tobacco evaporating from the tobacco, and this process is complicated, and the heat cannot be specifically calculated, so the heat absorbed by the tobacco is represented by a (tmarget — tmove), and this coefficient a may be obtained through experiments, and optionally, the coefficient a may be determined by the total weight of the tobacco and the moisture content of the tobacco. And the coefficient B is a constant and is used for adjusting the weight of the influence of the mode heat demand on the tobacco drying heat demand.
It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and other methods for determining the heat required for drying tobacco belong to the protection scope of the present application.
The invention discloses a tobacco dryer, which comprises an indoor unit, a drying chamber and a control unit, wherein the indoor unit comprises an indoor heat exchanger which works as a condenser and is used for providing heat for the drying chamber; an outdoor unit including a compressor and an outdoor heat exchanger operating as an evaporator; an indoor temperature sensor for detecting an indoor ambient temperature; an outdoor temperature sensor for detecting an outdoor ambient temperature; the PTC electric heating module is arranged on the indoor unit and used for heating the drying chamber; a controller configured to: determining the mode required heat of the dryer according to the operation mode of the tobacco dryer, the first temperature difference and the second temperature difference; determining the required tobacco drying heat according to the absorbed tobacco heat and the mode required heat; the compressor and the PTC electric heating module are controlled to be opened based on the tobacco drying required heat, so that when the required heat is small, the PTC electric heating module is controlled to be opened, when the required heat is large, the compressor is controlled to be opened, the phenomenon that the compressor is frequently started and stopped is reduced, the service life of the compressor is prolonged, and the operation safety of the heat pump dryer is guaranteed.
In order to further illustrate the technical idea of the present invention, the present invention further provides a control method for electric heating of a tobacco dryer, which is applied to a tobacco dryer including an indoor unit, an outdoor unit, an indoor temperature sensor, an outdoor temperature sensor, a PTC electric heating module and a controller, as shown in fig. 3, the method specifically comprises the following steps:
s301, determining mode demand heat corresponding to the operation mode of the tobacco dryer according to a first temperature difference value and a second temperature difference value, wherein the first temperature difference value is a difference value between the indoor environment temperature and the outdoor environment temperature, the second temperature difference value is a difference value between the target environment temperature and the indoor environment temperature, and the operation mode comprises a temperature stabilizing and humidity excluding mode, a temperature rising and humidity excluding mode and a temperature rising and humidity excluding mode.
In the step, the drying process is mainly divided into a temperature stabilizing stage and a temperature rising stage, and the fresh air door can be indirectly opened to carry out moisture removal in the two stages, so that the operation modes of the tobacco dryer comprise a temperature stabilizing and non-moisture removal mode, a temperature stabilizing and moisture removal mode, a temperature rising and non-moisture removal mode and a temperature rising and moisture removal mode. The heat demand of the tobacco dryer in different operation modes can be determined according to a first temperature difference value and a second temperature difference value, wherein the first temperature difference value is the difference between the indoor environment temperature and the outdoor environment temperature, and the second temperature difference value is the difference between the target environment temperature and the indoor environment temperature.
In order to accurately determine the mode required heat corresponding to the operation mode of the tobacco dryer, in some embodiments, the mode required heat corresponding to the operation mode of the tobacco dryer is determined according to the first temperature difference and the second temperature difference, which specifically includes:
when the operation mode is a temperature-stabilizing and humidity-discharging-free mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference value, and the warming heat amount is determined based on the second temperature difference value.
Specifically, the natural leakage heat is mainly heat which is transferred to the outside through a wall body of the drying chamber to cause partial heat loss and is considered, the natural leakage heat is determined according to a first temperature difference value, the dehumidification heat is mainly that outdoor low-temperature dry air is introduced from a new air door, high-temperature humid air is exhausted from a dehumidification opening, the humidity of a wet bulb in the drying chamber is reduced, and meanwhile, partial heat is also exhausted. The heat of humidity removal is determined according to the first temperature difference, the heat of temperature rise is the heat required by the drying chamber to rise from the current actual environment temperature to the target environment temperature in the temperature rise process, and the heat of temperature rise is determined according to the second temperature difference. When the operation mode is a temperature-stabilizing and humidity-discharging-free mode, the mode required heat is natural leakage heat; when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of natural leakage heat and dehumidification heat; when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of natural leakage heat and heating heat; when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat.
It should be noted that the above solution of the preferred embodiment is only a specific implementation solution proposed in the present application, and other methods for determining the mode required heat based on different operation modes are all within the protection scope of the present application.
S302, determining tobacco drying heat according to tobacco absorption heat and the mode heat, wherein the tobacco absorption heat is determined according to the target environment temperature and the indoor environment temperature;
in the step, the required heat for drying the tobacco is determined by the absorbed heat of the tobacco and the required heat of the mode, and the direct calculation step of the absorbed heat of the tobacco is relatively complex, so that the absorbed heat of the tobacco is determined by the target environment temperature and the indoor environment temperature in the step.
S303, controlling the compressor and the PTC electric heating module to be started based on the required heat for drying the tobacco.
In the step, after the required heat for drying the tobacco is obtained, the compressor and the PTC electric heating module are controlled to be started according to the required heat for drying the tobacco.
In order to reasonably control the opening of the compressor and the PTC electric heating module, in some embodiments, the opening of the compressor and the PTC electric heating module is controlled based on the required heat for drying the tobacco, specifically:
when the required heat for drying the tobacco is greater than or equal to a preset threshold value, starting the compressor and closing the PTC electric heating module;
and when the required heat for drying the tobacco is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
Specifically, the compressor and the PTC electric heating module work alternately to provide heat for the drying chamber, so that frequent starting of the compressor is avoided. When the required heat for drying the tobacco is greater than or equal to a preset threshold value, the required heat value is higher, heat is provided by adopting an indoor and outdoor machine circulating system where a compressor is located, the compressor is started, and the PTC electric heating module is closed; and when the required heat of the tobacco drying is smaller than a preset threshold value, the required heat value is less, and the PTC electric heating module is started and the compressor is closed.
It should be noted that, in the solution of this embodiment, optionally, when the heat quantity required for drying the tobacco is greater than or equal to the second threshold, the PTC electric heating module and the compressor may be simultaneously turned on, so as to provide more heat quantity in the drying chamber and increase the heating speed, and of course, a person skilled in the art may also set other methods for controlling the turn-on of the PTC electric heating module and the compressor, which all belong to the protection scope of this application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (8)
1. A tobacco dryer, comprising:
the indoor unit comprises an indoor heat exchanger which works as a condenser and is used for providing heat for the drying chamber;
an outdoor unit including a compressor and an outdoor heat exchanger operating as an evaporator;
an indoor temperature sensor for detecting an indoor ambient temperature;
an outdoor temperature sensor for detecting an outdoor ambient temperature;
the PTC electric heating module is arranged on the indoor unit and used for heating the drying chamber;
a controller configured to:
determining the mode required heat corresponding to the operation mode of the tobacco dryer according to the first temperature difference and the second temperature difference;
determining the required heat for drying the tobacco according to the absorbed heat of the tobacco and the required heat of the mode;
controlling the compressor and the PTC electrical heating module to be turned on based on the tobacco drying demand heat;
wherein the first temperature difference is a difference between the indoor ambient temperature and the outdoor ambient temperature, and the second temperature difference is a difference between a target ambient temperature and the indoor ambient temperature;
the heat absorbed by the tobacco is determined according to the target environment temperature and the indoor environment temperature;
the operation modes comprise a temperature-stabilizing and humidity-discharging-free mode, a temperature-stabilizing and humidity-discharging mode, a temperature-rising and humidity-discharging-free mode and a temperature-rising and humidity-discharging mode;
wherein the controller is configured to:
when the required tobacco drying heat is larger than or equal to a preset threshold value, the compressor is started and the PTC electric heating module is closed;
and when the required tobacco drying heat is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
2. The tobacco dryer of claim 1, wherein the controller is configured to:
when the operation mode is a temperature-stabilizing and humidity-discharging-free mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference, and the warming heat amount is determined based on the second temperature difference.
3. The tobacco dryer of claim 2, wherein said natural leakage heat is obtained by the formula:
natural leakage heat = leakage coefficient first temperature difference;
wherein the leakage coefficient is constant.
4. The tobacco dryer of claim 2, wherein the heat of moisture removal is obtained by the formula:
the heat of dehumidification = damper coefficient angle coefficient a first temperature difference;
and the air level coefficient and the air door angle coefficient are constants.
5. The tobacco dryer of claim 2, wherein said heat of increasing temperature is obtained by the formula:
heating heat = drying chamber coefficient wind shield coefficient second temperature difference;
wherein the drying chamber coefficient and the damper coefficient are constants.
6. The tobacco dryer of claim 1 wherein said tobacco drying demand heat is obtained by the formula:
Q general (1) ＝A*(T Target —T Indoor use )+B*Q；
Wherein Q is General assembly The heat required for said tobacco drying, Q said mode heat required, A x (Ttarget-Tchamber) representing the heat absorbed by said tobacco, A and B constant coefficients, T Target Is the target ambient temperature, T Indoor Is the indoor ambient temperature.
7. A control method for electric heating of a tobacco dryer is characterized in that the method is applied to the tobacco dryer comprising an indoor unit, an outdoor unit, an indoor temperature sensor, an outdoor temperature sensor, a PTC electric heating module and a controller, and comprises the following steps:
determining mode required heat corresponding to an operation mode of the tobacco dryer according to a first temperature difference value and a second temperature difference value, wherein the first temperature difference value is a difference value between an indoor environment temperature and an outdoor environment temperature, the second temperature difference value is a difference value between a target environment temperature and the indoor environment temperature, and the operation mode comprises a temperature-stabilizing and humidity-discharging-free mode, a temperature-stabilizing and humidity-discharging mode, a temperature-rising and humidity-discharging-free mode and a temperature-rising and humidity-discharging mode;
determining tobacco drying required heat according to the tobacco absorbed heat and the mode required heat, wherein the tobacco absorbed heat is determined according to the target environment temperature and the indoor environment temperature;
controlling the opening of the compressor and the PTC electric heating module based on the required heat for drying the tobacco;
wherein, control the opening of compressor and PTC electrical heating module based on the tobacco stoving demand heat, specifically do:
when the required heat for drying the tobacco is greater than or equal to a preset threshold value, starting the compressor and closing the PTC electric heating module;
and when the required heat for drying the tobacco is smaller than a preset threshold value, the PTC electric heating module is started and the compressor is closed.
8. The control method according to claim 7, wherein the mode required heat corresponding to the operation mode of the tobacco dryer is determined according to the first temperature difference and the second temperature difference, and specifically comprises:
when the operation mode is a temperature-stabilizing and humidity-non-discharging mode, the mode required heat is natural leakage heat;
when the operation mode is a temperature-stabilizing dehumidification mode, the mode required heat is the sum of the natural leakage heat and the dehumidification heat;
when the operation mode is a heating and non-dehumidifying mode, the mode required heat is the sum of the natural leakage heat and the heating heat;
when the operation mode is a heating and dehumidifying mode, the mode required heat is the sum of the natural leakage heat, the dehumidifying heat and the heating heat;
wherein the natural leakage heat amount and the dehumidifying heat amount are determined based on the first temperature difference, and the warming heat amount is determined based on the second temperature difference.
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| CN112985046B (en) * | 2021-02-04 | 2022-04-15 | 鹤山市雪尔达冷冻设备有限公司 | Heat pump drying device and lost foam drying method based on device |
| CN113959214A (en) * | 2021-09-09 | 2022-01-21 | 青岛海尔空调电子有限公司 | Tobacco dryer, operation control method and system thereof, and readable storage medium |
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