Method, apparatus, heat pump kiln and storage medium for controlling a heat pump kiln

Abstract

The application relates to the drying technical field and discloses a method for controlling a heat pump roasting room, the heat pump roasting room comprising: a heat pump roasting room body, the heat pump roasting room body being provided with an air valve, the heat pump roasting room body being divided into multiple areas, and a wet bulb temperature sensor being correspondingly arranged in each area; the method comprising the following steps: determining a current wet bulb temperature sensor participating in controlling the on-off state of the air valve during roasting; determining a target sensor in the case that the current wet bulb temperature sensor has a water shortage fault; and controlling the on-off state of the air valve according to parameters acquired by the target sensor. In this way, the on-off state of the air valve can be controlled based on parameters acquired by other sensors in the case that the current wet bulb temperature sensor has a fault. The roasting process does not need to be interrupted, the humidity of a roasting environment can be accurately determined, and the roasting quality of materials is ensured. The application further discloses a device for controlling a heat pump roasting room, a heat pump roasting room and a storage medium.

Description

Technical Field

[0001] This application relates to the field of drying technology, for example to a method, apparatus, heat pump drying room, and storage medium for controlling a heat pump drying room. Background Technology

[0002] Drying barns are commonly used for drying agricultural products and other materials. They are typically equipped with dry-bulb and wet-bulb temperature sensors to monitor these temperatures in real time. These temperatures control the operation of the compressor, fresh air valve, or exhaust valve to achieve heating or dehumidification. Therefore, the proper functioning of the dry-bulb and wet-bulb temperature sensors is a key factor in controlling the humidity within the drying barn.

[0003] The related technology discloses a dry-bulb and wet-bulb temperature sensor detector for intensive drying ovens, including an external interface and a microcontroller interface. Its detection method includes the following steps: Step 1: The detector automatically identifies whether the sensor and controller are connected and enters the corresponding detection stage; Step 2: The dry-bulb and wet-bulb temperature sensor for the intensive drying oven is tested; Step 3: The temperature control error of the intensive drying oven controller is detected. This detector enables rapid detection of whether the dry-bulb and wet-bulb temperature sensor for intensive drying ovens is faulty.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The aforementioned detector can detect whether the wet-bulb temperature sensor is malfunctioning. However, if the unit is not shut down after a malfunction is detected, the humidity of the drying chamber cannot be accurately determined; if the unit is shut down and restarted after a faulty wet-bulb temperature sensor is replaced, the drying process will be interrupted, affecting the quality of the baked materials.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides a method, apparatus, heat pump oven, and storage medium for controlling a heat pump oven to ensure the baking quality of materials when a wet-bulb temperature sensor malfunctions.

[0009] In some embodiments, the heat pump oven includes: a heat pump oven body, the heat pump oven body being provided with an air valve, the heat pump oven body being divided into multiple areas, each area being provided with a wet-bulb temperature sensor; the method includes: during the baking process, determining the current wet-bulb temperature sensor involved in controlling the opening and closing state of the air valve; in the event of a water shortage fault in the current wet-bulb temperature sensor, determining a target sensor; and controlling the opening and closing state of the air valve based on the parameters obtained by the target sensor.

[0010] In some embodiments, the apparatus includes a processor and a memory storing program instructions, the processor being configured to execute the aforementioned method for controlling a heat pump oven when the program instructions are executed.

[0011] In some embodiments, the heat pump oven includes: a heat pump oven body; and the aforementioned device for controlling the heat pump oven, which is installed on the heat pump oven body.

[0012] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned method for controlling a heat pump oven.

[0013] The method, apparatus, heat pump oven, and storage medium for controlling a heat pump oven provided in this disclosure can achieve the following technical effects:

[0014] The loading chamber is equipped with multiple pairs of wet-bulb and dry-bulb temperature sensors. During the baking process, the current wet-bulb temperature sensor involved in controlling the air valve's opening and closing is first determined. If the current wet-bulb temperature sensor malfunctions due to water shortage, a target sensor is identified. The parameters acquired by the target sensor are then used to control the air valve's opening and closing. This way, even if the current wet-bulb temperature sensor fails, the air valve can still be controlled based on parameters from other sensors. The humidity of the baking environment can be accurately determined without interrupting the baking process, ensuring the quality of the baked materials.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a schematic diagram of the structure of the heat pump oven provided in the embodiments of this disclosure;

[0018] Figure 2This is a schematic diagram of a method for controlling a heat pump drying room provided in an embodiment of this disclosure;

[0019] Figure 3 This is a schematic diagram of another method for controlling a heat pump oven provided in an embodiment of this disclosure;

[0020] Figure 4 This is a schematic diagram of another method for controlling a heat pump oven provided in an embodiment of this disclosure;

[0021] Figure 5 This is a schematic diagram of another method for controlling a heat pump oven provided in an embodiment of this disclosure;

[0022] Figure 6 This is a schematic diagram of a device for controlling a heat pump oven provided in an embodiment of this disclosure;

[0023] Figure 7 This is a schematic diagram of another device for controlling a heat pump oven provided in an embodiment of this disclosure;

[0024] Figure 8 This is a schematic diagram of a heat pump oven provided in an embodiment of this disclosure.

[0025] Figure label:

[0026] 1. Outdoor unit; 2. Indoor heat exchange unit; 3. Heating chamber; 4. Loading chamber; 5. Circulating fan; 6. Fresh air valve; 7. Exhaust air valve; 8. Exhaust air duct; 9. Air outlet; 10. Return air outlet; 11. Tobacco rack; 12. Tobacco leaves; 13. Upper dry-bulb temperature sensor; 14. Upper wet-bulb temperature sensor; 15. Lower dry-bulb temperature sensor; 16. Lower wet-bulb temperature sensor; 17. Gas concentration sensor. Detailed Implementation

[0027] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0028] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0029] Unless otherwise stated, the term "multiple" means two or more.

[0030] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0031] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0032] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0033] Combination Figure 1 As shown in the figure, this disclosure provides a heat pump oven, including a heat pump unit and a heat pump oven body.

[0034] The heat pump unit includes an outdoor unit 1 and an indoor heat exchange unit 2. The outdoor unit 1 is connected to the indoor heat exchange unit 2. The indoor heat exchange unit 2 is located within the heat pump oven body. Refrigerant circulates between the outdoor unit 1 and the indoor heat exchange unit 2. The refrigerant flows into the indoor heat exchange unit 2, providing heat to the heat pump oven body.

[0035] The heat pump oven body includes a heating chamber 3 and a loading chamber 4. A circulating fan 5 is installed inside the heating chamber 3. An indoor heat exchange unit 2 is located inside the heating chamber 3, below the circulating fan 5. A fresh air inlet is provided on the side wall of the heating chamber 3, and the position of the fresh air inlet is lower than the position of the indoor heat exchange unit 2. A fresh air valve 6 is provided at the fresh air inlet. A dehumidification air inlet is also provided on the side wall of the heating chamber 3, located near the bottom of the heating chamber 3. A dehumidification air valve 7 is provided at the dehumidification air inlet. A dehumidification air duct 8 is constructed inside the heating chamber 3, and the outlet of the dehumidification air duct 8 corresponds to the dehumidification air valve 7.

[0036] The heating chamber 3 has an air outlet 9, which is positioned higher than the circulating fan 5. The air outlet 9 is connected to the top of the loading chamber 4. The heating chamber 3 also has a return air inlet 10, which is located near the inlet of the exhaust duct 8. Both the return air inlet 10 and the inlet of the exhaust duct 8 are connected to the bottom of the loading chamber 4.

[0037] The loading chamber 4 is filled with materials to be dried. For example, if the material to be dried is tobacco leaves 12, then the loading chamber 4 is equipped with multiple layers of tobacco racks 11, on which the tobacco leaves 12 are suspended. Or, if the material to be dried is fresh flowers, then the loading chamber 4 is equipped with multiple layers of trays, on which the fresh flowers are placed.

[0038] The interior of the loading chamber 4 is divided into multiple zones, each containing a pair of wet-bulb temperature sensors and dry-bulb temperature sensors. For example, the interior of the loading chamber 4 is divided into an upper zone and a lower middle zone. The upper zone is equipped with an upper wet-bulb temperature sensor 14 and an upper dry-bulb temperature sensor 13; the lower middle zone is equipped with a lower wet-bulb temperature sensor 16 and a lower dry-bulb temperature sensor 15. Alternatively, the interior of the loading chamber 4 can be divided into an upper, middle, and lower zone. The upper zone is equipped with an upper wet-bulb temperature sensor 14 and an upper dry-bulb temperature sensor 13; the middle zone is equipped with a middle wet-bulb temperature sensor and a middle dry-bulb temperature sensor; and the lower zone is equipped with a lower wet-bulb temperature sensor 16 and a lower dry-bulb temperature sensor 15. A gas concentration sensor 17 is also installed in the middle of the loading chamber 4 to detect the concentration of gases released by the material to be baked during the baking process.

[0039] Optionally, the heat pump oven is an air source heat pump oven.

[0040] The heat pump oven also includes a controller. The controller is communicatively connected to the outdoor unit 1 and the circulating fan 5 to control their start and stop. The controller is also communicatively connected to the dry-bulb temperature sensor, the wet-bulb temperature sensor, and the gas concentration sensor 17 to acquire the parameters detected by the sensors. The controller is also communicatively connected to the fresh air valve 6 and the exhaust air valve 7 to control their opening and closing states based on the parameters detected by the sensors.

[0041] Combination Figure 2 As shown in the embodiments of this disclosure, a method for controlling a heat pump oven is provided, comprising:

[0042] S201, During the baking process, the controller determines the current wet-bulb temperature sensor that is involved in controlling the opening and closing status of the air valve.

[0043] S202, the controller determines the target sensor when the current wet-bulb temperature sensor experiences a water shortage fault.

[0044] S203, the controller controls the opening and closing state of the air valve based on the parameters obtained by the target sensor.

[0045] After the heat pump unit is turned on, baking begins. During baking, the opening and closing status of the air valves is controlled based on the dry-bulb and wet-bulb temperatures. Typically, dry-bulb and wet-bulb temperature sensors are installed in pairs in multiple zones from top to bottom within the loading chamber. The values ​​detected by the topmost dry-bulb and wet-bulb temperature sensors are preferentially used to control the air valve opening and closing. If the dry-bulb and wet-bulb temperature sensor in the top zone malfunctions, other sensors are used. During baking, the current wet-bulb temperature sensor controlling the air valve opening and closing status is determined. Since wet-bulb temperature sensors require sufficient moisture, a malfunction is generally due to water shortage. If the current wet-bulb temperature sensor malfunctions due to water shortage, a target sensor is identified. The parameters acquired by the target sensor are obtained, and the air valve opening and closing status is controlled based on these parameters. In other words, if the current wet-bulb temperature sensor malfunctions due to water shortage, the parameters acquired by the target sensor are used to control the air valve opening and closing.

[0046] In this embodiment, the loading chamber is equipped with multiple pairs of wet-bulb and dry-bulb temperature sensors. During the baking process, the current wet-bulb temperature sensor involved in controlling the air valve's opening and closing is first determined. If the current wet-bulb temperature sensor malfunctions due to water shortage, a target sensor is identified. Parameters acquired by the target sensor are then used to control the air valve's opening and closing. This way, even if the current wet-bulb temperature sensor malfunctions, the air valve's opening and closing can still be controlled based on parameters acquired by other sensors. The humidity of the baking environment can be accurately determined without interrupting the baking process, ensuring the quality of the baked material.

[0047] Optionally, the controller determines that the wet-bulb temperature sensor is experiencing a water shortage fault by:

[0048] The controller acquires the real-time wet-bulb temperature detected by the wet-bulb temperature sensor and the real-time dry-bulb temperature detected by the corresponding dry-bulb temperature sensor.

[0049] If the temperature difference between the real-time dry-bulb temperature and the real-time wet-bulb temperature is less than the temperature difference threshold, the controller determines that the current wet-bulb temperature sensor has a water shortage fault.

[0050] Set a first wet-bulb temperature threshold Ts1 and a second wet-bulb temperature threshold Ts2. During heat pump oven operation, acquire the current wet-bulb temperature Ts detected by the wet-bulb temperature sensor.

[0051] If Ts≤Ts1, it indicates that the wet-bulb temperature inside the heat pump oven is too low, therefore the exhaust air valve and fresh air valve are kept closed. Under the action of the circulating fan, air from the loading chamber enters the heating chamber through the return air vent. The refrigerant in the indoor heat exchange unit exchanges heat with the air in the heating chamber. The air after heat exchange enters the oven through the outlet.

[0052] If Ts > Ts1, it indicates that the wet-bulb temperature inside the heat pump drying chamber is too high at this time. Therefore, control the exhaust air valve and the fresh air valve to be in the open state. Under the action of the circulation fan, part of the air in the loading chamber enters the heating chamber through the return air duct. Another part is discharged to the external environment through the exhaust air duct. The air in the external environment enters the heating chamber through the fresh air duct. The refrigerant in the indoor heat exchange unit exchanges heat with the air in the heating chamber. The heated air enters the drying chamber through the air outlet.

[0053] Then obtain the dry-bulb temperature Tg detected by the corresponding dry-bulb temperature sensor. Calculate the moisture content d of the air in the drying chamber at this time through the current Tg and Ts. After the first preset time period, calculate the moisture content d’ of the air in the drying chamber again through Tg and Ts. Calculate the moisture content difference Δd, Δd = d’ - d. Set the moisture content difference threshold Δd0. Compare the magnitudes of Δd and Δd0. Here, if the fresh air valve and the exhaust air valve are open, then compare the magnitudes of Δd and Δd0 after the fresh air valve and the exhaust air valve have been open for the third preset time period. If Δd > Δd0, it indicates that there has been a significant change in the moisture content in the drying chamber. Then, after the second preset time period, obtain the real-time dry-bulb temperature Tg’ and the real-time wet-bulb temperature Ts’. Set the temperature difference threshold T0. If (Tg’ - Ts’) < T0, it indicates that the wet-bulb temperature is very close to the dry-bulb temperature, then determine that the current wet-bulb temperature sensor has a water shortage fault.

[0054] This is because when the air is unsaturated, the wet-bulb needs to consume heat due to surface evaporation, which causes the wet-bulb temperature to drop. At the same time, the wet-bulb continuously obtains heat replenishment from the air flowing through the wet-bulb. When the heat consumed by the wet-bulb due to evaporation and the heat obtained from the surrounding air are balanced, the wet-bulb temperature no longer continues to drop, thus resulting in a dry-bulb and wet-bulb temperature difference. The magnitude of the dry-bulb and wet-bulb temperature difference is mainly related to the air humidity at that time. The lower the air humidity, the faster the water on the surface of the wet-bulb evaporates, the more the wet-bulb temperature drops, and the greater the dry-bulb and wet-bulb temperature difference. Conversely, the higher the air humidity, the slower the water on the surface of the wet-bulb evaporates, the less the wet-bulb temperature drops, and the smaller the dry-bulb and wet-bulb temperature difference. During the actual operation of the drying chamber according to the baking process requirements, the controller will set the target values of the dry-bulb temperature and the wet-bulb temperature to keep the dry-bulb temperature and the wet-bulb temperature in the drying chamber within the control deadband accuracy. When the gauze is dry, the detected value of the wet-bulb temperature sensor will abnormally increase and even approach the detected value of the dry-bulb temperature sensor. Therefore, when (Tg’ - Ts’) < T0, it can be determined that the current wet-bulb temperature sensor has a water shortage fault.

[0055] Optionally, Δd0 can be set according to actual needs, or can be set according to the on / off states of the fresh air valve and the exhaust air valve.

[0056] Optionally, the third preset duration is longer than the first preset duration. The first, second, and third preset durations can all be set according to actual needs.

[0057] Optionally, if it is determined that the current wet-bulb temperature sensor is experiencing a water shortage fault, the controller sends a water shortage alarm through the alarm module.

[0058] Combination Figure 3 As shown in the embodiments of this disclosure, another method for controlling a heat pump oven is provided, including:

[0059] S201, During the baking process, the controller determines the current wet-bulb temperature sensor that is involved in controlling the on / off state of the air valve.

[0060] S212, the controller determines the fault conditions of multiple wet-bulb temperature sensors in a preset order.

[0061] S222, if the controller determines that the current wet-bulb temperature sensor is normal, it will designate the current wet-bulb temperature sensor as the target sensor.

[0062] S203, the controller controls the opening and closing state of the air valve based on the parameters obtained by the target sensor.

[0063] If the current wet-bulb temperature sensor experiences a water shortage fault, the fault condition of each wet-bulb temperature sensor is determined according to a preset sequence. Optionally, the above method is used to determine whether each wet-bulb temperature sensor has a water shortage fault in a top-to-bottom order. When it is determined that the current wet-bulb temperature sensor is normal, it is designated as the target sensor. For example, there are three wet-bulb temperature sensors arranged from top to bottom in the loading chamber: the upper wet-bulb temperature sensor, the middle wet-bulb temperature sensor, and the lower wet-bulb temperature sensor. As mentioned above, it is preferable that the parameters obtained by the upper wet-bulb temperature sensor are used to control the air valve. Therefore, if the current wet-bulb temperature sensor experiencing a water shortage fault is not the first wet-bulb temperature sensor in the preset sequence, it means that the first wet-bulb temperature sensor previously failed. However, during the process of using the current wet-bulb temperature sensor to control the air valve, the first wet-bulb temperature sensor may have already been replenished with water and is now functioning normally. Therefore, the fault condition of each wet-bulb temperature sensor is checked starting from the first wet-bulb temperature sensor. If the wet-bulb temperature sensor that is currently experiencing a water shortage fault is the first wet-bulb temperature sensor in the preset sequence, then the fault condition of each wet-bulb temperature sensor is checked starting from the second wet-bulb temperature sensor.

[0064] If the current wet-bulb temperature sensor is determined to be functioning normally, then that wet-bulb temperature sensor is designated as the target sensor. For example, if the current wet-bulb temperature sensor experiencing a water shortage fault is the first wet-bulb temperature sensor in a preset sequence, and the current wet-bulb temperature sensor currently being assessed for faults is the second wet-bulb temperature sensor, and that second wet-bulb temperature sensor is functioning normally, then the second wet-bulb temperature sensor is designated as the target sensor. It is not necessary to further assess whether subsequent wet-bulb temperature sensors are experiencing water shortage faults.

[0065] In this way, when the current wet-bulb temperature sensor malfunctions due to water shortage, a target sensor is promptly identified according to a preset sequence, and the parameters acquired by the target sensor are selected to control the air valve switch. This allows for continuous monitoring of the humidity in the baking environment, thereby ensuring the quality of the baked materials.

[0066] Optionally, combined Figure 4 As shown in the embodiments of this disclosure, another method for controlling a heat pump oven is provided, including:

[0067] S201, During the baking process, the controller determines the current wet-bulb temperature sensor that is involved in controlling the on / off state of the air valve.

[0068] S212, the controller determines the fault conditions of multiple wet-bulb temperature sensors in a preset order.

[0069] S222, if the controller determines that the current wet-bulb temperature sensor is normal, it will designate the current wet-bulb temperature sensor as the target sensor.

[0070] S213, the controller controls the opening and closing state of the air valve based on the wet-bulb temperature and wet-bulb temperature threshold obtained by the target wet-bulb temperature sensor.

[0071] Set a first wet-bulb temperature threshold Ts1 and a second wet-bulb temperature threshold Ts2. During heat pump oven operation, acquire the current wet-bulb temperature Ts detected by the wet-bulb temperature sensor. If Ts ≤ Ts1, it indicates that the wet-bulb temperature inside the heat pump oven is too low; therefore, the exhaust air valve and fresh air valve are kept closed. If Ts > Ts1, it indicates that the wet-bulb temperature inside the heat pump oven is too high; therefore, the exhaust air valve and fresh air valve are kept open.

[0072] Optionally, Ts1 = Tss - ΔTs, Ts2 = Tss + ΔTs. Where Tss is the target wet-bulb baking temperature set by the user according to the different baking processes of the materials being dried. ΔTs is the preset wet-bulb temperature control hysteresis.

[0073] In this way, based on the wet-bulb temperature obtained by the target wet-bulb temperature sensor, the opening and closing of the fresh air valve and the exhaust air valve are controlled to adjust the humidity of the baking environment in a timely manner, thereby ensuring the baking quality of the materials.

[0074] Optionally, combined Figure 5 As shown in the embodiments of this disclosure, another method for controlling a heat pump oven is provided, including:

[0075] S201, During the baking process, the controller determines the current wet-bulb temperature sensor that is involved in controlling the on / off state of the air valve.

[0076] S212, the controller determines the fault conditions of multiple wet-bulb temperature sensors in a preset order.

[0077] S222, if the controller determines that the current wet-bulb temperature sensor is normal, it will designate the current wet-bulb temperature sensor as the target sensor.

[0078] S232, when all wet-bulb temperature sensors experience a water shortage fault, the controller will identify the gas concentration sensor as the target sensor.

[0079] S213, the controller controls the opening and closing state of the air valve based on the wet-bulb temperature and wet-bulb temperature threshold obtained by the target wet-bulb temperature sensor.

[0080] S223: After the controller executes S232, it determines the type of material to be baked.

[0081] S233, the controller determines the concentration threshold based on the type of material being baked.

[0082] S243, the controller controls the opening and closing state of the air valve based on the concentration and concentration threshold obtained by the gas concentration sensor.

[0083] If all wet-bulb temperature sensors are found to be malfunctioning due to water shortage, the gas concentration sensor will be identified as the target sensor. Specifically, the gas concentration sensor will be an ammonia concentration sensor. When the materials to be cured are tobacco leaves and fresh flowers, the nitrogen oxides contained in the fresh tobacco leaves and fresh flowers will be converted into ammonia gas through their own respiration and decomposition. The fresh air intake and dehumidification process in the curing barn is related to the ammonia content in the curing barn. In the event of wet-bulb temperature sensor failure, the fresh air valve and dehumidification valve can be controlled by the ammonia concentration sensor.

[0084] Compared to fresh flowers, tobacco leaves release more ammonia. Therefore, a concentration threshold is determined based on the type of material being roasted. Here, the type of material being roasted is mainly distinguished between tobacco leaves and fresh flowers. The concentration thresholds corresponding to different types are pre-stored in the controller. Based on the comparison between the concentration S obtained from the gas concentration sensor and the concentration threshold, the on / off states of the fresh air valve and the exhaust air valve are controlled.

[0085] In this way, when all wet-bulb temperature sensors fail, the concentration obtained by the gas concentration sensor controls the opening and closing of the air valve to ensure precise adjustment of the baking humidity.

[0086] Optionally, in step S243, the controller controls the opening and closing state of the damper based on the concentration and concentration threshold obtained from the gas concentration sensor, including:

[0087] When the gas concentration is greater than the concentration threshold, the controller will open the fresh air valve and the exhaust air valve.

[0088] When the gas concentration is less than or equal to the concentration threshold, the controller will shut off the fresh air valve and the exhaust air valve.

[0089] From the start of baking after loading to the end of baking, the controller records the ammonia concentration S detected by the ammonia concentration sensor in real time during each sampling cycle, forming an ammonia concentration database for the entire baking cycle (while the wet-bulb temperature sensor is functioning normally). After a preset number of baking cycles, the average value of the sampling points from each detection cycle is taken to form a standard database of ammonia concentration in the baking chamber, thereby determining the concentration threshold. This provides a basis for subsequent control based on the concentration values ​​obtained by the ammonia concentration sensor.

[0090] When the material to be baked is tobacco, the concentration threshold is the first concentration threshold S'. Compare the magnitudes of S and S'. If S > (S' + ΔS), then the fresh air valve and the dehumidification valve are opened to perform dehumidification and fresh air intake control. If S ≤ (S' + ΔS), then the fresh air valve and the dehumidification valve are closed, and heating or air supply is operated according to the needs of the baking environment.

[0091] When the material to be baked is fresh flowers, the concentration threshold is the second concentration threshold S”. The values ​​of S and S” are compared. If S > (S” + ΔS), the fresh air valve and the exhaust valve are opened to perform dehumidification and fresh air intake control. If S ≤ (S” + ΔS), the fresh air valve and the exhaust valve are closed, and heating or air supply is operated according to the baking environment requirements. Optionally, ΔS is a preset ammonia concentration hysteresis value.

[0092] Because the amount of ammonia released from tobacco leaves during the baking process is greater than that released from fresh flowers, therefore, S'>S.

[0093] Optionally, after issuing a water shortage fault alarm for the wet-bulb temperature sensor, water can be added to the sensor. The alarm can be manually cleared after adding water. Alternatively, the alarm can be stopped once the controller calculates that (Tg'-Ts') ≥ T0. Simultaneously with the alarm stopping, the controller uses the parameters obtained from the wet-bulb temperature sensor to control the opening and closing of the air valve.

[0094] Combination Figure 6 As shown, this embodiment of the disclosure provides an apparatus 60 for controlling a heat pump oven, including: a first determining module 61, a second determining module 62, and a control module 63. The first determining module 61 is configured to determine the current wet-bulb temperature sensor involved in controlling the opening and closing state of the air valve during the baking process. The second determining module 62 is configured to determine a target sensor in the event of a water shortage fault in the current wet-bulb temperature sensor. The control module 63 is configured to control the opening and closing state of the air valve based on the parameters obtained by the target sensor.

[0095] The apparatus for controlling a heat pump baking oven provided in this embodiment includes multiple pairs of wet-bulb and dry-bulb temperature sensors inside the loading chamber. During the baking process, the current wet-bulb temperature sensor involved in controlling the air valve opening and closing is first determined. If the current wet-bulb temperature sensor malfunctions due to water shortage, a target sensor is determined. Parameters acquired by the target sensor are then used to control the air valve opening and closing. This way, even if the current wet-bulb temperature sensor malfunctions, the air valve opening and closing can still be controlled based on parameters acquired by other sensors. The humidity of the baking environment can be accurately determined without interrupting the baking process, ensuring the quality of the baked materials.

[0096] Combination Figure 7 As shown, this disclosure provides an apparatus 70 for controlling a heat pump oven, including a processor 71 and a memory 72. Optionally, the apparatus may further include a communication interface 73 and a bus 74. The processor 71, communication interface 73, and memory 72 can communicate with each other via the bus 74. The communication interface 73 can be used for information transmission. The processor 71 can call logical instructions in the memory 72 to execute the method for controlling the heat pump oven described in the above embodiment.

[0097] Furthermore, the logic instructions in the aforementioned memory 72 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0098] The memory 72, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 71 executes functional applications and data processing by running the program instructions / modules stored in the memory 72, that is, it implements the method for controlling the heat pump oven in the above embodiments.

[0099] The memory 72 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 72 may include high-speed random access memory and may also include non-volatile memory.

[0100] Combination Figure 8 As shown, this disclosure provides a heat pump oven 80, including: a heat pump oven body, and the aforementioned device 60 (70) for controlling the heat pump oven. The device 60 (70) for controlling the heat pump oven is installed in the heat pump oven body. The installation relationship described herein is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the device 60 (70) for the heat pump oven can be adapted to feasible product bodies to achieve other feasible embodiments.

[0101] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described method for controlling a heat pump oven.

[0102] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0103] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0104] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0105] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0106] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0107] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a heat pump drying oven, the heat pump drying oven comprising: Heat pump baking house body, the heat pump baking house body is provided with a damper, and is characterized in that the heat pump baking house body is divided into multiple areas, and a wet bulb temperature sensor is correspondingly arranged in each area; The method includes: During the baking process, determine the current wet bulb temperature sensor that participates in controlling the opening and closing state of the damper; In the case of a water shortage fault occurring in the current wet bulb temperature sensor, determine the target sensor; Wherein, each wet bulb temperature sensor corresponds to a dry bulb temperature sensor; the following method is used to determine that a water shortage fault has occurred in the current wet bulb temperature sensor: Obtain the dry bulb temperature Tg detected by the corresponding dry bulb temperature sensor and the wet bulb temperature Ts detected by the wet bulb temperature sensor. When Ts is greater than the first wet bulb temperature threshold Ts1, control the exhaust damper and the fresh air damper to be in the open state; wherein, Ts1 = Tss - ΔTs, Tss is the target baking wet bulb temperature set by the user according to the baking process of different dried materials; ΔTs is the preset wet bulb temperature control hysteresis; Calculate the moisture content d of the air in the baking house at this time according to Tg and Ts at this time; After a first preset time period, calculate the moisture content d' of the air in the baking house at this time again through Tg and Ts; Calculate the moisture content difference Δd, Δd = d' - d; Compare Δd and Δd0. If Δd > Δd0, then obtain the real-time dry bulb temperature Tg' and the real-time wet bulb temperature Ts' after a second preset time period. If (Tg' - Ts') < T0, then determine that a water shortage fault has occurred in the current wet bulb temperature sensor, where Δd0 is the set moisture content difference threshold and T0 is the set temperature difference threshold; Wherein, if the fresh air damper and the exhaust damper are open, then compare Δd and Δd0 after the fresh air damper and the exhaust damper are open for a third preset time period; the third preset time period is greater than the first preset time period; Control the opening and closing state of the damper according to the parameters obtained by the target sensor.

2. The method according to claim 1, characterized in that, The determination of the target sensor includes: Determine the fault conditions of multiple wet bulb temperature sensors in a preset order; When it is determined that the current wet bulb temperature sensor is normal, determine the current wet bulb temperature sensor as the target sensor.

3. The method according to claim 2, characterized in that, The control of the opening and closing state of the damper according to the parameters obtained by the target sensor includes: Control the opening and closing state of the damper according to the wet bulb temperature obtained by the target wet bulb temperature sensor and the wet bulb temperature threshold.

4. The method according to claim 2, characterized in that, A gas concentration sensor is further arranged in the heat pump baking house body; The determination of the target sensor further includes: In the case where water shortage faults occur in all wet bulb temperature sensors, determine the gas concentration sensor as the target sensor.

5. The method according to claim 4, characterized in that, When the target sensor is the gas concentration sensor, the control of the opening and closing state of the damper according to the parameters obtained by the target sensor includes: Determine the type of the baked material; Determine the concentration threshold according to the type of the baked material; Control the opening and closing state of the damper according to the concentration obtained by the gas concentration sensor and the concentration threshold.

6. The method according to claim 5, characterized in that, The damper includes: a fresh air damper and an exhaust damper; The control of the opening and closing state of the damper according to the gas concentration obtained by the gas concentration sensor and the concentration threshold includes: When the gas concentration is greater than the concentration threshold, the fresh air valve and the dehumidification valve are opened. When the gas concentration is less than or equal to the concentration threshold, the fresh air valve and the dehumidification valve are controlled to close.

7. An apparatus for controlling a heat pump oven, comprising a processor and a memory storing program instructions, characterized in that, The processor is configured to, when running the program instructions, execute the method for controlling a heat pump oven as described in any one of claims 1 to 6.

8. A heat pump drying room, characterized in that, include: Heat pump oven body; The device for controlling a heat pump oven as described in claim 7 is installed on the heat pump oven body.

9. A storage medium storing program instructions, characterized in that, When the program instructions are executed, they perform the method for controlling a heat pump oven as described in any one of claims 1 to 6.

Images