Drying machine dehumidification control method and drying machine

Abstract

The present application relates to the technical field of drying, and particularly provides a drying machine dehumidification control method and a drying machine, aiming to solve the problem that the heat load of the internal dehumidification module of the existing drying machine is greatly affected by the dehumidification requirements of different temperature sections, and the single refrigerant flow path is used to supply refrigerant to the internal dehumidification module, and the dehumidification capacity is limited. For this purpose, the drying machine dehumidification control method comprises: in the case that the first refrigeration and heating circulation system enters the dehumidification mode, based on the comparison results of the difference T1 and the first and second preset difference values and the comparison result of the difference T2 and the third preset difference value, selectively controlling the second refrigeration and heating circulation system to enter one of the heating mode, the dehumidification mode and the closed mode. The present application can select single-system dehumidification or double-system dehumidification according to the size of the dehumidification amount, which helps to save resources, reduces the temperature fluctuation in the curing room during the dehumidification process, and improves the tobacco curing quality.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of drying, and particularly provides a drying machine dehumidification control method and a drying machine. BACKGROUND

[0002] Nowadays, many people have the habit of smoking, and tobacco needs to be processed through many procedures to become the cigarettes finally purchased by consumers. In the process of tobacco production, tobacco drying is an essential procedure. In the process of tobacco drying, a heat pump heating technology is generally adopted, which can improve the drying quality of tobacco and reduce the working difficulty of tobacco drying.

[0003] In the prior art, the drying and dehumidification of an integrated dryer in the drying process is performed by an internal dehumidification module of the dryer, and the fresh air dehumidification of a split dryer. In the process of tobacco drying, the heat load of the internal dehumidification module is greatly affected by the dehumidification requirements of different temperature sections, and the internal dehumidification module is supplied with refrigerant by a single refrigerant flow path, so that the dehumidification capacity is limited, and finally the drying quality and efficiency of tobacco are affected.

[0004] Therefore, the present application needs to provide a new drying machine dehumidification control method and a drying machine to solve the above technical problems. SUMMARY

[0005] The present application aims to solve the above technical problems, that is, to solve the problem that the heat load of the internal dehumidification module of the existing drying machine in the drying and dehumidification process is greatly affected by the dehumidification requirements of different temperature sections, and the internal dehumidification module is supplied with refrigerant by a single refrigerant flow path, so that the dehumidification capacity is limited, and finally the drying quality and efficiency of tobacco are affected.

[0006] To this end, in a first aspect, the present application provides a drying machine dehumidification control method, the drying machine comprising a first refrigeration and heating circulation system and a second refrigeration and heating circulation system, the drying machine dehumidification control method comprising:

[0007] obtaining a dry-bulb temperature in a drying room;

[0008] obtaining a wet-bulb temperature in the drying room;

[0009] comparing the wet-bulb temperature with a first preset value;

[0010] based on the comparison result of the wet-bulb temperature and the first preset value, selectively controlling the first refrigeration and heating circulation system to enter a dehumidification mode or remain in an original mode;

[0011] in the case that the first refrigeration and heating circulation system enters the dehumidification mode, obtaining a difference T1 between the current dry-bulb temperature and the dry-bulb temperature before entering the dehumidification, and obtaining a difference T2 of the wet-bulb temperature drop in an adjacent preset interval time;

[0012] comparing the difference value T1 with a first preset difference value and a second preset difference value;

[0013] comparing the difference value T2 with a third preset difference value;

[0014] based on the comparison result of the difference value T1 with the first preset difference value and the second preset difference value and the comparison result of the difference value T2 with the third preset difference value, selectively controlling the second refrigeration and heating cycle system to enter one of a heating mode, a dehumidification mode and a closedown mode;

[0015] wherein the first preset difference value and the second preset difference value are different in size.

[0016] In the case of adopting the above technical solution, the present application can dynamically and automatically select single-system dehumidification or double-system dehumidification according to the dehumidification load in the curing barn. Single-system dehumidification refers to only the first refrigeration and heating cycle system being in the dehumidification mode, and double-system dehumidification refers to both the first refrigeration and heating cycle system and the second refrigeration and heating cycle system being in the dehumidification mode. In the case of large dehumidification amount, double-system dehumidification can improve the dehumidification efficiency, and in the case of small dehumidification amount, single-system dehumidification is adopted without wasting energy. The whole dehumidification process of the present application reduces the temperature fluctuation in the curing barn and improves the tobacco curing quality.

[0017] In the specific embodiment of the above drying machine dehumidification control method, the step of "based on the comparison result of the wet-bulb temperature with the first preset value, selectively controlling the first refrigeration and heating cycle system to enter a dehumidification mode or keep the original mode" specifically comprises:

[0018] if the wet-bulb temperature is greater than the first preset value, then controlling the first refrigeration and heating cycle system to enter the dehumidification mode; and / or

[0019] if the wet-bulb temperature is less than or equal to the first preset value, then controlling the first refrigeration and heating cycle system to keep the original mode.

[0020] In the case of adopting the above technical solution, the present application compares the wet-bulb temperature with the first preset value. If the wet-bulb temperature is greater than the first preset value, it indicates that the curing barn needs to be dehumidified to reduce the humidity in the curing barn. If the wet-bulb temperature is lower than the first preset value, it indicates that the humidity in the curing barn does not reach the dehumidification standard, thereby realizing the automatic dehumidification function.

[0021] In the specific embodiment of the above drying machine dehumidification control method, in the case of the first refrigeration and heating cycle system keeping the original mode, the second refrigeration and heating cycle system does not enter the dehumidification mode.

[0022] In the specific embodiment of the above drying machine dehumidification control method, the step of "selectively controlling the second refrigeration and heating circulation system to enter one of the heating mode, the dehumidification mode and the closed mode based on the comparison results of the difference value T1 with the first preset difference value and the second preset difference value and the comparison result of the difference value T2 with the third preset difference value" specifically comprises:

[0023] If the difference value T1 is less than or equal to the first preset difference value and the difference value T2 is greater than the third preset difference value, the second refrigeration and heating circulation system is controlled to enter the heating mode; and / or

[0024] If the difference value T1 is greater than the second preset difference value and the difference value T2 is greater than the third preset difference value, the second refrigeration and heating circulation system is controlled to be in the closed mode; and / or

[0025] If the difference value T1 is less than or equal to the first preset difference value and the difference value T2 is less than or equal to the third preset difference value, the second refrigeration and heating circulation system is controlled to enter the dehumidification mode; and / or

[0026] If the difference value T1 is greater than the second preset difference value and the difference value T2 is less than or equal to the third preset difference value, the second refrigeration and heating circulation system is controlled to enter the dehumidification mode.

[0027] The first preset difference value is less than the second preset difference value.

[0028] In the case of using the above technical solution, when the first refrigeration and heating circulation system is in the dehumidification mode and the difference value T1 is less than or equal to the first preset difference value, it indicates that the temperature reduction in the curing barn is not conducive to the curing of tobacco, so the second refrigeration and heating circulation system is started to enter the heating mode for heating the air entering the curing barn, so that the temperature in the curing barn is maintained within a reasonable range for drying, thereby ensuring the drying quality of tobacco. When the difference value T2 is less than or equal to the third preset difference value, it indicates that the speed of the wet-bulb temperature decrease slows down within the preset interval, and the dehumidification efficiency is low when only the first refrigeration and heating circulation system is used for dehumidification. Therefore, the second refrigeration and heating circulation system is controlled to enter the dehumidification mode, and the dehumidification speed is fast and the dehumidification efficiency is improved.

[0029] In the specific embodiment of the above drying machine dehumidification control method, the drying machine further comprises an electric heater, and the drying machine dehumidification control method further comprises:

[0030] In the case that the second refrigeration and heating circulation system is in the dehumidification mode, the electric heater is selectively controlled to enter the heating mode or the closed mode based on the comparison result of the difference value T1 with the first preset difference value and the second preset difference value.

[0031] In the specific embodiment of the above drying machine dehumidification control method, the heating mode includes a low-grade heating mode and a high-grade heating mode, and the step of "selectively controlling the electric heater to enter a heating mode or a closedown mode based on the result of comparing the difference value T1 with the first preset difference value and the second preset difference value when the second refrigeration and heating cycle system is in the dehumidification mode" specifically includes:

[0032] When the difference value T1 is less than or equal to the first preset difference value when the second refrigeration and heating cycle system is in the dehumidification mode, the electric heater is first controlled to enter the low-grade heating mode, and when the difference value T1 is still less than the first preset difference value after a preset time, the electric heater is controlled to enter the high-grade heating mode; and / or

[0033] When the difference value T1 is greater than the second preset difference value when the second refrigeration and heating cycle system is in the dehumidification mode, the electric heater is controlled to be in the closedown mode.

[0034] In the above technical solution, since the dehumidification operation causes the temperature in the drying room to drop, when the difference value T1 is greater than the first preset difference value, it indicates that the dehumidification causes the temperature in the drying room to drop, and the temperature in the drying room needs to be restored to a reasonable drying temperature range by the electric heater to ensure the drying quality of the tobacco. When the dry-bulb temperature still drops after the electric heater enters the low-grade heating mode, i.e., the difference value T1 is still greater than the first preset difference value, the electric heater enters the high-grade heating mode to ensure that the temperature in the drying room can be restored to the required drying temperature. The electric heater is switched between the low-grade and high-grade modes to avoid resource waste.

[0035] In the specific embodiment of the above drying machine dehumidification control method, the first refrigeration and heating cycle system includes a first compressor, a dehumidification heat exchanger, an inner heat exchanger, and an outer heat exchanger. The first compressor, the outer heat exchanger, and the dehumidification heat exchanger can be used for the dehumidification mode, and the first compressor, the inner heat exchanger, and the outer heat exchanger can be used for the heating mode. The second refrigeration and heating cycle system includes a second compressor and shares the dehumidification heat exchanger, the inner heat exchanger, and the outer heat exchanger with the first refrigeration and heating cycle system. The second compressor, the outer heat exchanger, and the dehumidification heat exchanger can be used for the dehumidification mode, and the second compressor, the inner heat exchanger, and the outer heat exchanger can be used for the heating mode.

[0036] In the specific embodiment of the above drying machine dehumidification control method, the dehumidification heat exchanger and the inner heat exchanger are both installed in the heating chamber of the drying machine, the dehumidification heat exchanger is located below the inner heat exchanger and is arranged close to the return air inlet, an air exhaust fan is installed in the heating chamber close to the dehumidification heat exchanger, the electric heater and the circulating fan are installed in the heating chamber above the inner heat exchanger in sequence, and the outer heat exchanger, the first compressor and the second compressor are all installed outside the heating chamber.

[0037] In the specific embodiment of the above drying machine dehumidification control method, the drying machine dehumidification control method further comprises:

[0038] In the case that the first refrigeration and heating cycle system is in the dehumidification mode and the second refrigeration and heating cycle system is not in the dehumidification mode, the gear of the air exhaust fan is controlled to be in the high gear, and the gear of the circulating fan is controlled to be in the low gear; and / or

[0039] In the case that the first refrigeration and heating cycle system and the second refrigeration and heating cycle system are both in the dehumidification mode, the gear of the air exhaust fan is controlled to be in the low gear, and the gear of the circulating fan is controlled to be in the high gear.

[0040] In the case of adopting the above technical solution, the temperature fluctuation in the curing barn can be reduced, which helps to improve the tobacco drying quality.

[0041] In a second aspect, the application further provides a drying machine comprising a controller configured to perform the drying machine dehumidification control method according to any one of the above technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0042] The preferred embodiments of the application will be described below with reference to the accompanying drawings, in which:

[0043] Figure 1 is the main step flow chart of the drying machine dehumidification control method provided by the application;

[0044] Figure 2 is the detailed step flow chart of the drying machine dehumidification control method provided by the application;

[0045] Figure 3 is the refrigerant circulation flow path schematic diagram of the combination of the first refrigeration and heating cycle system and the second refrigeration and heating cycle system.

[0046] LIST OF REFERENCE NUMERALS:

[0047] 1, first compressor; 2, second compressor; 3, inner heat exchanger; 4, dehumidification heat exchanger; 5, outer heat exchanger. DETAILED DESCRIPTION

[0048] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present application, and are not used to limit the protection scope of the present application. Those skilled in the art can make adjustments to them as needed in order to adapt to specific application occasions.

[0049] It should be noted that, in the description of the present application, the terms indicating the direction or positional relationship such as "upper", "lower", "inner", "outer" and the like are based on the direction or positional relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the related devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the ordinal numbers "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0050] In addition, it should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the prior art, the heat load of the internal dehumidification module of the integrated dryer is greatly affected by the dehumidification requirements of different temperature sections, and a single refrigerant flow path is used to supply refrigerant to the internal dehumidification module, which has limited dehumidification capacity, ultimately affecting the drying quality and efficiency of tobacco.

[0052] To solve the above technical problems, the present application provides a dryer, which comprises a curing barn and a heating chamber. The heating chamber is installed on one side of the curing barn, and an air inlet and an air return are provided between the heating chamber and the curing barn. The air heated in the heating chamber enters the curing barn through the air inlet, and the air after passing through the tobacco in the curing barn enters the heating chamber through the air return. Dry bulbs and wet bulbs are installed in the curing barn. The temperature of the dry bulbs is detected by a dry bulb temperature sensor, and the temperature of the wet bulbs is detected by a wet bulb temperature sensor.

[0053] Furthermore, referring to Figure 3The dryer further comprises a first refrigeration and heating circulation system and a second refrigeration and heating circulation system, the first refrigeration and heating circulation system comprises a first compressor, a dehumidification heat exchanger, an inner heat exchanger and an outer heat exchanger, the first compressor, the outer heat exchanger and the dehumidification heat exchanger can be used for a dehumidification mode, and the first compressor, the inner heat exchanger and the outer heat exchanger can be used for a heating mode; the second refrigeration and heating circulation system comprises a second compressor and shares the dehumidification heat exchanger, the inner heat exchanger and the outer heat exchanger with the first refrigeration and heating circulation system, the second compressor, the outer heat exchanger and the dehumidification heat exchanger can be used for the dehumidification mode, and the second compressor, the inner heat exchanger and the outer heat exchanger can be used for the heating mode. The dehumidification heat exchanger corresponds to an evaporator, the inner heat exchanger corresponds to a condenser, and the outer heat exchanger corresponds to an evaporator.

[0054] It should be noted that the refrigerant flow path of the first refrigeration and heating circulation system and the refrigerant flow path of the second refrigeration and heating circulation system are independent of each other and not communicated with each other. That is, two coils are arranged in each of the dehumidification heat exchanger, the outer heat exchanger and the inner heat exchanger, one of which is used for refrigerant circulation in the first refrigeration and heating circulation system, and the other is used for refrigerant circulation in the second refrigeration and heating circulation system.

[0055] Specifically, the dehumidification heat exchanger and the inner heat exchanger are installed in the heating chamber of the dryer, the dehumidification heat exchanger is located below the inner heat exchanger and is arranged close to the return air inlet, an air exhaust fan is installed in the part of the heating chamber close to the dehumidification heat exchanger, for example, the air exhaust fan is installed above the dehumidification heat exchanger and below the inner heat exchanger, an electric heater and a circulating fan are installed in the heating chamber above the inner heat exchanger in sequence, and the outer heat exchanger, the first compressor and the second compressor are all installed on the outer side of the heating chamber. After the air of the return air inlet enters the heating chamber, it is cooled by the dehumidification heat exchanger to realize the dehumidification function.

[0056] Referring to Figure 1 The application further provides a dryer dehumidification control method, which comprises the following steps:

[0057] S1, obtaining the dry-bulb temperature in the drying room;

[0058] S2, obtaining the wet-bulb temperature in the drying room;

[0059] S3, comparing the wet-bulb temperature with the first preset value;

[0060] S4, selectively controlling the first refrigeration and heating circulation system to enter a dehumidification mode or remain in the original mode based on the comparison result of the wet-bulb temperature and the first preset value;

[0061] S5, in the case that the first refrigeration and heating circulation system is in the dehumidification mode, obtaining the difference T1 between the current dry-bulb temperature and the dry-bulb temperature before entering the dehumidification, and obtaining the difference T2 of the wet-bulb temperature drop in the adjacent preset interval time;

[0062] S6, comparing the difference value T1 with the first preset difference value and the second preset difference value;

[0063] S7, comparing the difference value T2 with the third preset difference value;

[0064] S8, based on the comparison results of the difference value T1 with the first preset difference value and the second preset difference value and the comparison results of the difference value T2 with the third preset difference value, selectively controlling the second refrigeration and heating cycle system to enter one of the heating mode, the dehumidification mode and the closed mode;

[0065] Wherein, the first preset difference value and the second preset difference value are different in size.

[0066] It should be noted that when the number of dry balls in the curing room is multiple, the dry ball temperature refers to the average of multiple dry ball temperatures. When the number of wet balls in the curing room is multiple, the wet ball temperature is the average of multiple wet ball temperatures.

[0067] In addition, regarding step S1 and step S2, it should be noted that although the above describes that step S1 is executed first, and then step S2 is executed, this is only an example, and those skilled in the art can arbitrarily adjust the order of step S1 and step S2 without deviating from the basic principles of the present application, for example, step S2 is executed first, and then step S1 is executed, or both can be executed simultaneously. The adjusted technical solution and the technical solution of the present application belong to equivalent technical solutions, and therefore will also fall within the protection scope of the present application.

[0068] In addition, regarding step S6 and step S7, it should be noted that although the above describes that step S6 is executed first, and then step S7 is executed, this is only an example, and those skilled in the art can arbitrarily adjust the order of step S6 and step S7 without deviating from the basic principles of the present application, for example, step S7 is executed first, and then step S6 is executed, or both can be executed simultaneously. The adjusted technical solution and the technical solution of the present application belong to equivalent technical solutions, and therefore will also fall within the protection scope of the present application.

[0069] In addition, in the above embodiment, the first refrigeration and heating cycle system maintaining the original mode refers to the mode of the first refrigeration and heating cycle system before entering the dehumidification mode, such as the heating mode.

[0070] Referring to Figure 2 In one embodiment, the step S4 of "selectively controlling the first refrigeration and heating cycle system to enter the dehumidification mode or maintain the original mode based on the comparison result of the wet ball temperature and the first preset value" specifically includes:

[0071] S41, if the wet ball temperature is greater than the first preset value, then controlling the first refrigeration and heating cycle system to enter the dehumidification mode;

[0072] S42, if the wet bulb temperature is less than or equal to the first preset value, then the first refrigeration and heating cycle system is controlled to keep the original mode.

[0073] The present application compares the wet bulb temperature with the first preset value, if the wet bulb temperature is greater than the first preset value, it indicates that the curing barn needs to be dehumidified to reduce the humidity in the curing barn, if the wet bulb temperature is lower than the first preset value, it indicates that the humidity in the curing barn does not reach the dehumidification standard, thus realizing the automatic dehumidification function.

[0074] It should be noted that, in the case that the first refrigeration and heating cycle system keeps the original mode, the second refrigeration and heating cycle system does not enter the dehumidification mode, that is, only in the case that the first refrigeration and heating cycle system enters the dehumidification mode, the mode of the second refrigeration and heating cycle system is judged to determine which one of the heating mode, the dehumidification mode and the closed mode is entered.

[0075] Referring to Figure 2 In one embodiment, the step S8 of "selectively controlling the second refrigeration and heating cycle system to enter one of the heating mode, the dehumidification mode and the closed mode based on the comparison results of the difference T1 with the first preset difference and the second preset difference and the comparison result of the difference T2 with the third preset difference" specifically includes:

[0076] S81, if the difference T1 is greater than the second preset difference and the difference T2 is greater than the third preset difference, then the second refrigeration and heating cycle system is controlled to be in the closed mode;

[0077] In the above step S81, the difference T1 is greater than the second preset difference, which indicates that the temperature in the curing barn is in the reasonable temperature range for tobacco drying during the dehumidification process, and the temperature of the curing barn does not need to be ensured by increasing the heating function, so the second refrigeration and heating cycle system does not need to be started;

[0078] S82, if the difference T1 is less than or equal to the first preset difference and the difference T2 is greater than the third preset difference, then the second refrigeration and heating cycle system is controlled to enter the heating mode;

[0079] In the above step S82, when the difference T1 is less than or equal to the first preset difference, it indicates that the temperature in the curing barn is reduced to a value that is not conducive to tobacco drying, so the second refrigeration and heating cycle system is started to enter the heating mode, which is used to heat the air entering the curing barn, so that the temperature in the curing barn is maintained in the reasonable range for drying, thereby ensuring the drying quality of the tobacco;

[0080] S83, if the difference T1 is less than or equal to the first preset difference and the difference T2 is less than or equal to the third preset difference, then the second refrigeration and heating cycle system is controlled to enter the dehumidification mode;

[0081] S84, if the difference T1 is greater than the second preset difference, and the difference T2 is less than or equal to the third preset difference, then control the second refrigeration and heating cycle system to enter a dehumidification mode;

[0082] The first preset difference is less than the second preset difference.

[0083] In steps S83 and S84, when the difference T2 is less than or equal to the third preset difference, it indicates that the speed of the wet-bulb temperature decreasing in the preset interval time is slow, and the dehumidification efficiency is low when only the first refrigeration and heating cycle system is used for dehumidification. Therefore, regardless of whether the difference T1 is greater than the second preset difference or less than the first preset difference, the second refrigeration and heating cycle system is controlled to enter the dehumidification mode, and the dehumidification speed is fast, and the dehumidification efficiency is improved.

[0084] From the above embodiment, it can be seen that when the difference T2 is greater than the third preset difference, and the difference T1 is between the first preset difference and the second preset difference, the second refrigeration and heating cycle system is in the heating mode.

[0085] It should be noted that the values of the first preset difference, the second preset difference, and the third preset difference are set according to actual use requirements, such as the first preset difference being -0.5°C, the second preset difference being 0.5°C, and the third preset difference being 0.5°C. The values of the first preset difference, the second preset difference, and the third preset difference are not limited in the present application.

[0086] In one embodiment, the dryer dehumidification control method further comprises: in the case that the second refrigeration and heating cycle system is in the dehumidification mode, selectively controlling the electric heater to enter a heating mode or a closed mode based on the comparison result of the difference T1 with the first preset difference and the second preset difference.

[0087] Specifically, the heating mode includes a low-grade heating mode and a high-grade heating mode. The step of "selectively controlling the electric heater to enter a heating mode or a closed mode based on the comparison result of the difference T1 with the first preset difference and the second preset difference in the case that the second refrigeration and heating cycle system is in the dehumidification mode" specifically includes:

[0088] In the case that the second refrigeration and heating cycle system is in the dehumidification mode, if the difference T1 is less than or equal to the first preset difference, the electric heater is first controlled to enter the low-grade heating mode. If the difference T1 is still less than the first preset difference after a preset time, the electric heater is controlled to enter the high-grade heating mode.

[0089] In the case that the second refrigeration and heating cycle system is in the dehumidification mode, if the difference T1 is greater than the second preset difference, the electric heater is controlled to be in the off mode. It should be noted that when the difference T1 is between the first preset difference and the second preset difference, the electric heater is in the heating mode until the difference T1 is greater than the second preset difference, and then the electric heater is turned off.

[0090] Since the dehumidification operation causes the temperature in the curing barn to decrease, when the difference T1 is less than or equal to the first preset difference, it indicates that the temperature decrease caused by dehumidification is insufficient to ensure the quality of tobacco curing, and the temperature in the curing barn needs to be restored to a reasonable drying temperature range by the electric heater to ensure the drying quality of tobacco. When the dry-bulb temperature still decreases after the electric heater enters the low-grade heating mode, that is, the difference T1 is still less than the first preset difference, the electric heater enters the high-grade heating mode to ensure that the temperature in the curing barn can be restored to the required drying temperature. The electric heater is switched between the low grade and the high grade to avoid resource waste.

[0091] It should be noted that the specific value of the preset time is not limited in the present application, and is designed according to actual use requirements. For example, the preset time is 1 min.

[0092] In one embodiment, the drying machine dehumidification control method further comprises: when the first refrigeration and heating cycle system is in the dehumidification mode and the second refrigeration and heating cycle system is not in the dehumidification mode, controlling the gear of the exhaust fan to be in the high gear and controlling the gear of the circulating fan to be in the low gear.

[0093] When the first refrigeration and heating cycle system and the second refrigeration and heating cycle system are both in the dehumidification mode, the gear of the exhaust fan is controlled to be in the low gear, and the gear of the circulating fan is controlled to be in the high gear.

[0094] In the above embodiment, the electric heater can be a PTC heater. When the first refrigeration and heating cycle system is started to perform single-system dehumidification, since the exhaust fan is in the high gear, the heat exchange efficiency is improved, and the dehumidification effect is better. The temperature of the air after dehumidification decreases, and the air needs to be heated by the second refrigeration and heating cycle system before entering the curing barn. The circulating fan in the low gear helps to fully exchange heat, thereby reducing the temperature fluctuation in the curing barn. When double-system dehumidification is adopted, the temperature of the air after dehumidification needs to be increased before entering the curing barn. For the electric heater, the higher the wind speed, the better the heat exchange effect. Therefore, the circulating fan is in the high gear.

[0095] In addition, the present application also provides a drying machine comprising a controller configured to execute the drying machine dehumidification control method of any one of the above technical solutions.

[0096] In the above embodiment and various extended embodiments, the application can dynamically and automatically select single-system dehumidification or double-system dehumidification according to the dehumidification load in the curing barn. Single-system dehumidification refers to only the first refrigeration and heating circulation system being in the dehumidification mode, and double-system dehumidification refers to both the first refrigeration and heating circulation system and the second refrigeration and heating circulation system being in the dehumidification mode. In the case of large dehumidification amount, double-system dehumidification can improve the dehumidification efficiency, and in the case of small dehumidification amount, single-system dehumidification is adopted without wasting energy. The entire dehumidification process of the application reduces the temperature fluctuation in the curing barn and improves the tobacco curing quality.

[0097] So far, the technical solutions of the application have been described in combination with the preferred embodiments shown in the drawings, but those skilled in the art can easily understand that the protection scope of the application is obviously not limited to these specific embodiments. Those skilled in the art can make equivalent changes or replacements to the related technical features without departing from the principles of the application, and the technical solutions after the changes or replacements will all fall within the protection scope of the application.

Claims

1. A dryer dehumidification control method, characterized by, The drying machine comprises a first refrigeration and heating cycle system and a second refrigeration and heating cycle system, The first refrigeration and heating cycle system comprises a dehumidification heat exchanger; The second refrigeration and heating cycle system shares the dehumidification heat exchanger with the first refrigeration and heating cycle system; The drying machine dehumidification control method comprises: obtaining the dry-bulb temperature in the drying room; obtaining the wet-bulb temperature in the drying room; comparing the wet-bulb temperature with a first preset value; based on the comparison result of the wet-bulb temperature and the first preset value, selectively controlling the first refrigeration and heating cycle system to enter a dehumidification mode or remain in the original mode; in the case that the first refrigeration and heating cycle system enters the dehumidification mode, obtaining the difference T1 between the current dry-bulb temperature and the dry-bulb temperature before entering the dehumidification mode, and obtaining the difference T2 of the wet-bulb temperature drop in the adjacent preset interval time; comparing the difference T1 with a first preset difference and a second preset difference; comparing the difference T2 with a third preset difference; based on the comparison result of the difference T1 with the first preset difference and the second preset difference and the comparison result of the difference T2 with the third preset difference, selectively controlling the second refrigeration and heating cycle system to enter one of a heating mode, a dehumidification mode and a closedown mode; wherein the first preset difference and the second preset difference are different in size.

2. The dryer dehumidification control method of claim 1, wherein, The step of "based on the comparison result of the wet-bulb temperature and the first preset value, selectively controlling the first refrigeration and heating cycle system to enter a dehumidification mode or remain in the original mode" specifically comprises: if the wet-bulb temperature is greater than the first preset value, then controlling the first refrigeration and heating cycle system to enter the dehumidification mode; and / or if the wet-bulb temperature is less than or equal to the first preset value, then controlling the first refrigeration and heating cycle system to remain in the original mode.

3. The dryer dehumidification control method of claim 1, wherein, In the case that the first refrigeration and heating cycle system remains in the original mode, the second refrigeration and heating cycle system does not enter the dehumidification mode.

4. The dryer dehumidification control method according to any one of claims 1-3, wherein, The step of "based on the comparison result of the difference T1 with the first preset difference and the second preset difference and the comparison result of the difference T2 with the third preset difference, selectively controlling the second refrigeration and heating cycle system to enter one of a heating mode, a dehumidification mode and a closedown mode" specifically comprises: if the difference T1 is less than or equal to the first preset difference and the difference T2 is greater than the third preset difference, then controlling the second refrigeration and heating cycle system to enter the heating mode; and / or if the difference T1 is greater than the second preset difference and the difference T2 is greater than the third preset difference, then controlling the second refrigeration and heating cycle system to be in the closedown mode; and / or if the difference T1 is less than or equal to the first preset difference and the difference T2 is less than or equal to the third preset difference, then controlling the second refrigeration and heating cycle system to enter the dehumidification mode; and / or if the difference T1 is greater than the second preset difference and the difference T2 is less than or equal to the third preset difference, then controlling the second refrigeration and heating cycle system to enter the dehumidification mode; wherein the first preset difference is less than the second preset difference.

5. The dryer dehumidification control method of claim 4, wherein, The dryer further comprises an electric heater, and the dryer dehumidification control method further comprises: In the case that the second refrigeration and heating cycle system is in the dehumidification mode, based on the result of comparison between the difference value T1 and the first and second preset difference values, the electric heater is selectively controlled to enter a heating mode or a closed mode.

6. The dryer dehumidification control method of claim 5, wherein, The heating mode comprises a low-grade heating mode and a high-grade heating mode, and the step of "in the case that the second refrigeration and heating cycle system is in the dehumidification mode, based on the result of comparison between the difference value T1 and the first and second preset difference values, the electric heater is selectively controlled to enter a heating mode or a closed mode" specifically comprises: In the case that the second refrigeration and heating cycle system is in the dehumidification mode, if the difference value T1 is less than or equal to the first preset difference value, the electric heater is first controlled to enter the low-grade heating mode, and if the difference value T1 is still less than the first preset difference value after a preset time, the electric heater is controlled to enter the high-grade heating mode; and / or In the case that the second refrigeration and heating cycle system is in the dehumidification mode, if the difference value T1 is greater than the second preset difference value, the electric heater is controlled to be in the closed mode.

7. The clothes dryer dehumidification control method of claim 6, wherein, The first refrigeration and heating cycle system further comprises a first compressor, an inner heat exchanger and an outer heat exchanger, the first compressor, the outer heat exchanger and the dehumidification heat exchanger can be used in the dehumidification mode, and the first compressor, the inner heat exchanger and the outer heat exchanger can be used in the heating mode; the second refrigeration and heating cycle system comprises a second compressor and shares the dehumidification heat exchanger, the inner heat exchanger and the outer heat exchanger with the first refrigeration and heating cycle system, the second compressor, the outer heat exchanger and the dehumidification heat exchanger can be used in the dehumidification mode, and the second compressor, the inner heat exchanger and the outer heat exchanger can be used in the heating mode.

8. The clothes dryer dehumidification control method of claim 7, wherein, The dehumidification heat exchanger and the inner heat exchanger are both installed in a heating chamber of the dryer, the dehumidification heat exchanger is located below the inner heat exchanger and is arranged close to an air return port, an air exhaust fan is installed in the heating chamber close to the dehumidification heat exchanger, the electric heater and a circulating fan are installed in the heating chamber above the inner heat exchanger in sequence, and the outer heat exchanger, the first compressor and the second compressor are all installed outside the heating chamber.

9. The dryer dehumidification control method of claim 8, wherein, The dryer dehumidification control method further comprises: In the case that the first refrigeration and heating cycle system is in the dehumidification mode and the second refrigeration and heating cycle system is not in the dehumidification mode, the gear of the air exhaust fan is controlled to be in the high gear, and the gear of the circulating fan is controlled to be in the low gear; and / or In the case that the first refrigeration and heating cycle system and the second refrigeration and heating cycle system are both in the dehumidification mode, the gear of the air exhaust fan is controlled to be in the low gear, and the gear of the circulating fan is controlled to be in the high gear.

10. A dryer comprising a controller, characterized in that, The controller is configured to be capable of performing the dryer dehumidification control method according to any one of claims 1-9.

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