Variable frequency air energy and electric heater combined drying device

Abstract

The application relates to the technical field of drying devices, in particular to a variable-frequency air-energy and electric heating body combined drying device. The device comprises a drying device body, a variable-frequency air-energy mechanism and an electric heating body mechanism which are arranged in the drying device body. The variable-frequency air-energy mechanism comprises a variable-frequency compressor, a condenser, a liquid storage tank, an evaporation device and a gas-liquid separator. The variable-frequency compressor, the condenser, the liquid storage tank, the evaporation device and the gas-liquid separator are sequentially communicated through a refrigerant pipeline. The refrigerant pipeline circulates refrigerant. The variable-frequency compressor is used for compressing low-pressure gas into high-pressure gas and adjusting the rotating speed to match actual refrigeration or heating demand. The application has the effects of improving drying efficiency, reducing energy consumption and improving product quality.

Description

Technical Field

[0001] This application relates to the field of drying equipment technology, and in particular to a variable frequency air energy and electric heating element combined drying device. Background Technology

[0002] Shoe drying production lines are an indispensable part of the shoe manufacturing process, primarily used to accelerate the drying of shoe materials. Common solutions in existing drying technologies include the use of electric heating tubes or electric heating lamps. Electric heating tubes generate heat through resistance and conduction through the air, suitable for deep, slow heating; electric heating lamps, on the other hand, use radiant heat transfer, enabling rapid and uniform heating of the object's surface.

[0003] While the aforementioned technologies have addressed some issues in the drying process, significant shortcomings remain. Firstly, energy consumption is high, especially during prolonged continuous constant-temperature operation. Because the heating element uses a thyristor chopper to regulate power, the energy consumption of the heating element and lamps is significantly higher than that of a variable-frequency air-source heat pump. For example... Figure 6 As shown, existing variable frequency air source heat pumps, based on the Carnot cycle principle, have varying COP values ​​depending on temperature. Furthermore, the frequent start-stop cycles of traditional fixed-frequency compressors not only increase energy consumption but also shorten equipment lifespan. Additionally, a single heating method is insufficient to meet the drying needs of different types of shoe materials, especially in situations requiring deep heating. Using existing drying devices in such cases results in poor drying performance and limited flexibility. Summary of the Invention

[0004] The purpose of this application is to provide a variable frequency air source and electric heating element combined drying device that reduces energy consumption and improves system stability and adaptability while ensuring efficient drying.

[0005] The variable frequency air source and electric heating element combined drying device provided in this application adopts the following technical solution:

[0006] A variable frequency air source and electric heating element combined drying device includes a drying device body, and also includes a variable frequency air source mechanism and an electric heating element mechanism installed inside the drying device body.

[0007] The variable frequency air source mechanism includes a variable frequency compressor, a condenser, a liquid storage tank, an evaporator, and a gas-liquid separator. The variable frequency compressor, condenser, liquid storage tank, evaporator, and gas-liquid separator are connected in sequence through a refrigerant pipeline, and refrigerant flows through the refrigerant pipeline.

[0008] The variable frequency compressor is used to compress low-pressure gas into high-pressure gas, and adjusts the speed to match the actual cooling or heating demand.

[0009] The condenser is used to absorb heat from the external environment and condense the refrigerant in the refrigerant pipeline, thereby achieving a cooling effect.

[0010] The liquid storage tank is used to store liquid refrigerant;

[0011] The evaporation equipment includes at least two evaporators connected in parallel, which are used to absorb heat from the refrigerant and release it to the external environment, thereby achieving a heating effect.

[0012] The gas-liquid separator is used to separate gaseous and liquid refrigerant, allowing the gaseous refrigerant to enter the compressor and storing the liquid refrigerant.

[0013] By adopting the above technical solutions, the drying device of this application uses a combination of variable frequency air source heat pump and electric heating element for drying, achieving the following effects: When the drying oven starts and heats up, the electric heating element rapidly heats and radiates heat simultaneously with the air source heat pump. This combined heating results in rapid heating, reducing preheating time and improving production efficiency. After normal operation, the high energy efficiency ratio of the air source heat pump maintains a constant temperature in the drying oven, reducing energy consumption and improving energy utilization. The variable frequency compressor adjusts its speed to match actual cooling or heating needs, reducing drastic fluctuations caused by load changes and avoiding energy losses caused by frequent starts and stops of traditional fixed frequency compressors, thus improving system stability and equipment lifespan. The gas-liquid separator separates gaseous and liquid refrigerant, ensuring that only pure gaseous refrigerant enters the compressor, protecting it from damage, and temporarily storing excess liquid refrigerant, further enhancing system reliability and safety. Therefore, it can reduce energy consumption and improve system stability and adaptability while ensuring efficient drying.

[0014] Preferably, the variable frequency air source mechanism further includes a water-oil separator installed between the variable frequency compressor and the condenser. The water-oil separator is used to separate the lubricating oil and refrigerant flowing out of the variable frequency compressor, and to allow the separated refrigerant to flow to the condenser, while the separated lubricating oil accumulates at the bottom of the water-oil separator.

[0015] By adopting the above technical solution, this application achieves effective separation of the mixture flowing out of the variable frequency compressor through a water-oil separator. Specifically, the water-oil separator can accurately separate lubricating oil and refrigerant, ensuring that the refrigerant flows smoothly into the condenser to participate in the subsequent heat exchange process, while allowing the lubricating oil to accumulate at the bottom of the water-oil separator for further treatment or reuse. This design effectively ensures the stable operation of the entire variable frequency air source heat pump mechanism, avoids the impact of insufficient or excessive lubricating oil on system performance, thereby improving the overall reliability and service life of the equipment.

[0016] Preferably, the bottom of the water-oil separator is connected to the gas-liquid separator via a first capillary tube, which is used to return the lubricating oil separated by the water-oil separator to the variable frequency compressor.

[0017] By adopting the above technical solution, this application connects the gas-liquid separator through a first capillary tube, allowing the separated lubricating oil to flow back to the variable frequency compressor. This design ensures that the variable frequency compressor receives sufficient lubrication and protection during both high-frequency and low-frequency operation, preventing wear or damage to the internal mechanical structure due to insufficient lubricating oil, and improving the compressor's reliability and service life. Simultaneously, it avoids excessive lubricating oil occupying system volume, reducing the refrigerant flow rate and speed, and ensuring efficient system operation.

[0018] Preferably, the condenser and the gas-liquid separator are connected by a second capillary tube, which is used to directly inject refrigerant into the compressor when the temperature is too high.

[0019] By adopting the above technical solution, this application uses a second capillary tube to directly inject refrigerant into the compressor when the temperature is too high, effectively reducing the exhaust temperature, preventing refrigerant decomposition and lubricant performance degradation, thereby protecting the compressor's efficiency and lifespan. Simultaneously, this helps maintain a high system energy efficiency ratio and enhances the stability and reliability of system operation.

[0020] Preferably, a solenoid valve is provided between the condenser and the second capillary tube, the solenoid valve being used to control the on / off state of the second capillary tube.

[0021] By adopting the above technical solution, this application can precisely control the on / off state of the second capillary tube through the setting of the solenoid valve, and inject refrigerant into the compressor in a timely manner when needed, effectively reducing the exhaust temperature and preventing high temperature from damaging the compressor. At the same time, this design helps maintain a high system energy efficiency ratio and enhances the stability and reliability of the system.

[0022] Preferably, a one-way valve is also provided between the second capillary tube and the gas-liquid separator, the one-way valve being used to prevent refrigerant backflow.

[0023] By adopting the above technical solution, this application effectively prevents refrigerant backflow between the second capillary tube and the gas-liquid separator through the setting of a one-way valve. This design ensures that the refrigerant flows in a predetermined direction, avoiding system pressure instability caused by backflow, thereby improving the operational reliability and safety of the entire system. Combined with the overall solution, the components in the variable frequency air source heat pump work collaboratively, maintaining efficient heating while further optimizing system performance, reducing energy consumption, and extending equipment lifespan. The one-way valve significantly improves the system's stable operation under high-temperature conditions, providing a better working environment for the compressor.

[0024] Preferably, a filter and an expansion valve are provided between the liquid storage tank and the evaporation equipment, the expansion valve being used to regulate the flow rate and pressure of the refrigerant.

[0025] By adopting the above technical solution, the expansion valve of this application can regulate the flow and pressure of the refrigerant, ensuring the stability of system operation. The filter can remove impurities from the refrigerant, ensuring the purity of the refrigerant, thereby extending the service life of the equipment and improving the reliability and energy efficiency ratio of the system.

[0026] Preferably, the drying device body includes a first drying chamber and a second drying chamber, the variable frequency air energy mechanism is located above the first drying chamber, and the second drying chamber is located below the first drying chamber;

[0027] The first drying chamber is provided with a first heating chamber at the top and a first conveying device and a first insulation board at the bottom.

[0028] The second drying chamber has a second heating chamber at the top and a second conveying device and a second insulation plate at the bottom.

[0029] By adopting the above technical solution, this application achieves a zoned design for the drying device by setting up a first drying chamber and a second drying chamber. The first and second drying chambers are each equipped with independent heating chambers, conveying equipment, and insulation panels. This structure allows for differentiated processing for different drying stages or different types of products, improving the flexibility and adaptability of the drying process. Specific effects are as follows: The vertical distribution of the first and second drying chambers makes reasonable use of space, facilitating multi-layer processing and improving the equipment's space utilization and production capacity. The first and second heating chambers can be configured with different heating parameters, and combined with the characteristics of the variable frequency air source heat pump, this enhances the equipment's space utilization and production capacity. The first and second conveying equipment ensure orderly product transport during the drying process, avoiding potential contamination and efficiency losses due to manual intervention. The use of the first and second insulation panels effectively reduces heat loss, improves energy efficiency, lowers energy costs, and simultaneously ensures the uniformity and stability of the temperature within the drying chamber.

[0030] Preferably, the heating element mechanism includes a plurality of heating element devices, which are disposed in the first heating chamber and the second heating chamber, and the heating element devices include NIR, MIR and PTC.

[0031] By adopting the above technical solution, the electric heating element mechanism of this application includes several electric heating element devices. This design enables the drying device to utilize rapid heating radiation from the electric heating elements during startup, simultaneously heating with air energy, accelerating the temperature rise, shortening preheating time, and improving production efficiency. The electric heating element devices include supporting accessories such as NIR, MIR, and PTC. Furthermore, after normal operation, the electric heating element devices can assist the air energy source in efficiently maintaining a constant oven temperature, further reducing energy consumption.

[0032] Preferably, the heating element mechanism further includes several circulation devices, which are installed on both sides of the first drying chamber and the second drying chamber. The circulation devices include a circulating fan, an air outlet plate, and a return air plate.

[0033] By adopting the above technical solution, the additional circulation devices in the electric heating element mechanism of this application can effectively promote the flow of hot air in the first and second drying chambers. Specifically, the circulating fan drives the air to form forced convection in the drying chamber, making the heat distribution more uniform and avoiding local overheating or uneven heating, thereby improving the drying quality of the product. The design of the air outlet and return air plates further optimizes the airflow organization, ensuring that hot air can efficiently cover the surface of the items to be dried, accelerating the condensation rate of moisture, significantly shortening the drying time, and improving production efficiency. In addition, this uniform and efficient heat transfer method also helps to reduce energy consumption and achieve energy saving.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The combined heating method enables the drying device to quickly heat and radiate through electric heating elements when started, while simultaneously heating with air energy. This results in rapid temperature rise, reduces preheating time, and improves production efficiency.

[0036] 2. After normal operation, the variable frequency air source heat pump maintains a high energy efficiency ratio, keeping the oven at a constant temperature and significantly reducing energy consumption;

[0037] 3. Variable frequency compressors adjust their speed to match actual cooling or heating demands, reducing drastic fluctuations in the system caused by load changes. This avoids the energy losses caused by frequent starts and stops of traditional fixed frequency compressors, improving system stability and equipment lifespan. Furthermore, by altering frequency and voltage characteristics, the low power factor efficiency of thyristor voltage regulation is avoided. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0039] Figure 2 This is a schematic diagram of the pipeline of the variable frequency air source heat pump mechanism according to an embodiment of this application;

[0040] Figure 3 This is a cross-sectional structural diagram of an embodiment of this application;

[0041] Figure 4 This is a schematic diagram of the drying production line structure according to an embodiment of this application;

[0042] Figure 5 This is a comparison chart of the energy consumption of this application embodiment with that of a simple air source or electric heating element;

[0043] Figure 6 This is a table showing how the thermal efficiency (COP) of existing technologies varies with temperature.

[0044] In the diagram, 1. Drying device body; 11. First drying chamber; 12. First heating chamber; 13. First conveying equipment; 14. First insulation board; 15. Second drying chamber; 16. Second heating chamber; 17. Second conveying equipment; 18. Second insulation board; 2. Variable frequency air source mechanism; 21. Variable frequency compressor; 22. Oil-water separator; 23. Condenser; 24. Liquid storage tank; 25. Filter; 26. Electronic expansion valve; 27. Evaporation equipment; 28. First capillary tube; 29. ​​Second capillary tube; 30. Solenoid valve; 31. Check valve; 32. Gas-liquid separator; 3. Electric heating element mechanism; 31. Electric heating element equipment; 32. Circulation equipment. Detailed Implementation

[0045] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application provides a clear and complete description of the technical solutions in the embodiments. The described embodiments are merely possible technical implementations of the present invention and not all possible implementations. Those skilled in the art can, in conjunction with the embodiments of the present invention, obtain other embodiments without creative effort, and these embodiments are also within the protection scope of the present invention. The inventors of this application have discovered that existing heating and drying equipment in shoe drying production lines suffers from high energy consumption and narrow temperature adjustment range. Therefore, this application mainly adopts a technical solution that combines variable frequency air energy with an electric heating element for shoe drying, achieving the goal of improving drying efficiency while reducing energy consumption. The following is a further detailed description of this application.

[0046] This application provides a variable frequency air source and electric heating element combined drying device, referencing... Figure 1 , Figure 2 and Figure 3The device includes a drying unit body 1, and also includes a variable frequency air source mechanism 2 and an electric heating element mechanism 3 installed inside the drying unit body 1. The variable frequency air source mechanism 2 includes a variable frequency compressor 21, an oil-water separator 22, a condenser 23, a liquid storage tank 24, a filter 25, an electronic expansion valve 26, an evaporator 27, a first capillary tube 28, a second capillary tube 29, a solenoid valve 30, a one-way valve 31, and a gas-liquid separator 32. The variable frequency compressor 21, the condenser 23, the liquid storage tank 24, the evaporator 27, and the gas-liquid separator 32 are sequentially connected to form a circuit through refrigerant pipelines, and refrigerant flows through the refrigerant pipelines.

[0047] In this embodiment, the variable frequency compressor 21 is one of the core components of the entire variable frequency air source heat pump system 2. The main function of the variable frequency compressor 21 is to compress low-pressure gas into high-pressure gas and adjust its speed to match actual cooling or heating demands. This design reduces drastic system fluctuations caused by load changes, improving system stability and energy efficiency. The variable frequency compressor 21 can be either a screw compressor or a scroll compressor; each type has its own advantages in performance, and the appropriate model can be selected based on the specific application. For example, screw compressors are suitable for large-capacity, high-load applications, while scroll compressors are suitable for small-to-medium capacity, light-load applications.

[0048] The main function of the condenser 23 in this embodiment is to absorb heat from the external environment and condense the refrigerant in the refrigerant pipes, thereby achieving a cooling effect. The condenser 23 is typically made of copper tubing because copper has excellent thermal conductivity and can quickly transfer heat. To improve heat exchange efficiency, a hydrophilic coating can be applied to the surface of the condenser 23, increasing the contact area with moisture and accelerating the condensation process. Furthermore, the condenser 23 can also employ a finned structure to increase the surface area and further improve heat dissipation.

[0049] The main function of the liquid receiver 24 in this embodiment is to store liquid refrigerant, ensuring a sufficient supply of refrigerant in the system. The liquid receiver 24 is generally made of stainless steel, which is highly corrosion-resistant and has a long service life. An internal float valve is installed in the liquid receiver 24 to automatically regulate the liquid level and maintain a stable refrigerant level. The volume of the liquid receiver 24 needs to be designed reasonably according to the actual operating conditions; too large or too small a volume will affect the system's performance.

[0050] The evaporation device 27 in this embodiment includes at least two evaporators connected in parallel. The main function of the evaporator is to absorb heat from the refrigerant and release it to the external environment, thereby achieving a heating effect. The evaporators are typically made of copper tubes with aluminum foil fins covering their outer surface to increase the heat exchange area. The dual-evaporator design improves the reliability and stability of the system; even if one evaporator fails, the other can continue to operate, ensuring production continuity.

[0051] The main function of the gas-liquid separator 32 in this embodiment is to separate gaseous and liquid refrigerant, allowing the gaseous refrigerant to enter the compressor and storing the liquid refrigerant. The gas-liquid separator 32 typically employs a cyclone separation principle, using centrifugal force to separate gaseous and liquid substances. The inlet and outlet of the gas-liquid separator 32 should be designed in a funnel shape to reduce resistance and improve separation efficiency. The separated liquid refrigerant can flow back to the liquid storage tank 24 through a capillary tube for reuse.

[0052] In this embodiment, the oil-water separator 22 is installed between the variable frequency compressor 21 and the condenser 23. Its main function is to separate the lubricating oil and refrigerant in the refrigeration system, which is crucial for the variable frequency compressor 21. When the system is in operation, the lubricating oil is discharged from the variable frequency compressor 21 along with the refrigerant and eventually returns to the variable frequency compressor 21 through the system's circulation. Insufficient oil in the variable frequency compressor 21 will result in insufficient lubrication, causing wear or damage to the internal mechanical structure and affecting its lifespan. However, excessive oil will occupy the system's volume, reducing the refrigerant's flow rate and speed, and in severe cases, causing a decrease in heating efficiency. Since the variable frequency compressor 21 adjusts its operating frequency to regulate heating capacity, this places higher demands on the separation and recovery of lubricating oil. The oil-water separator 22 can accurately separate and recover lubricating oil, ensuring that the variable frequency compressor 21 receives adequate lubrication and protection during both high-frequency and low-frequency operation. The separated lubricating oil will accumulate at the bottom of the oil-water separator 22, and the oil at the bottom will return to the compressor through the action of the first capillary tube 28.

[0053] In this embodiment, the condenser 23 and the gas-liquid separator 32 are connected in a loop via a second capillary tube 29. The second capillary tube 29 is used to directly inject refrigerant into the variable frequency compressor 21 when the temperature is too high. The on / off state of the second capillary tube 29 is controlled by a solenoid valve 30 to ensure that the refrigerant is injected into the compressor's suction line at the appropriate time and amount. A one-way valve 31 is used to prevent refrigerant backflow.

[0054] In this embodiment, the filter 25 and expansion valve 26 are disposed between the liquid receiver 24 and the evaporator 27. The main function of the filter 25 is to remove impurities from the refrigerant, preventing blockage of the pipes and affecting the normal operation of the system. The filter 25 typically employs a multi-layer filter structure, with the pore size of each layer gradually decreasing to achieve a step-by-step filtration effect. The expansion valve 26 is used to regulate the flow rate and pressure of the refrigerant, maintaining a certain degree of superheat to ensure the stability and reliability of the system. The expansion valve 26 can be manually adjusted according to actual operating conditions or dynamically adjusted through an automated control system to adapt to different working conditions.

[0055] In the specific implementation process, filter 25 is installed between the liquid storage tank 24 and the evaporation equipment 27, employing a multi-layer filter structure. The pore sizes of each layer are 50μm, 25μm, and 10μm, respectively, forming a three-stage filtration effect. The filter screen is made of stainless steel, which is highly corrosion-resistant and not easily deformed. Expansion valve 26 is an electronic expansion valve with a built-in microprocessor, which can automatically adjust the opening degree according to real-time data, providing high precision and fast response.

[0056] like Figure 3 As shown, the drying device body 1 in this embodiment includes a first drying chamber 11 and a second drying chamber 15. A variable frequency air source heat pump 2 is located above the first drying chamber 11, and the second drying chamber 15 is located below the first drying chamber 11. The first drying chamber 11 has a first heating chamber 12 at its top and a first conveying device 13 and a first insulation board 14 at its bottom. The second drying chamber 15 has a second heating chamber 16 at its top and a second conveying device 17 and a second insulation board 18 at its bottom. The first drying chamber 11 and the second drying chamber 15 are separated by an insulation wall to reduce heat loss and improve energy efficiency. Both the first conveying device 13 and the second conveying device 17 are belt conveyors with anti-slip stripes to prevent the shoe materials from slipping during transportation. The first insulation board 14 and the second insulation board 18 can be made of polyurethane foam, which has excellent insulation properties and can effectively maintain the temperature inside the drying chamber.

[0057] like Figure 3 As shown, the heating element mechanism 3 in this embodiment includes several heating element devices 31 and a circulation device 32. The heating element devices 31 are disposed within the first heating chamber 12 and the second heating chamber 16, and mainly include heating element lamps and lamp covers. The selection of the heating element is very important; commonly used options include heating tubes, carbon fiber heating element lamps, and quartz heating element lamps. Carbon fiber heating element lamps are characterized by rapid heating and long lifespan, making them suitable for applications requiring rapid heating; quartz heating element lamps have higher thermal efficiency and are suitable for scenarios requiring continuous heating. The lamp cover protects the heating element from dust and other impurities, and also reflects light to improve heating efficiency.

[0058] like Figure 3 As shown, the circulation device 32 of this embodiment is installed on both sides of the first drying chamber 11 and the second drying chamber 15, and includes a circulating fan, an air outlet plate, and a return air plate. The circulating fan is responsible for evenly distributing the heated air within the drying chamber to ensure a consistent temperature in each area. The design of the air outlet plate and the return air plate needs to consider the direction and speed of airflow, and typically adopts a louvered structure to facilitate adjustment of air volume and direction. The operating mode of the circulation device 32 can be set to timed on / off, or intelligently controlled based on real-time temperature feedback to save energy.

[0059] In practical implementation, the variable frequency air source mechanism 2 and the electric heating element mechanism 3 work together to achieve efficient drying. Upon startup, the electric heating element rapidly heats the air, causing the temperature inside the oven to rise quickly and shortening the preheating time. Subsequently, the variable frequency air source mechanism 2 begins operation, maintaining a constant temperature through efficient energy conversion and transmission, reducing energy consumption. The combination of these two heating methods not only improves the drying speed but also ensures uniform heat distribution on the shoe materials, preventing localized overheating or undercooling. The variable frequency compressor 21 uses a high-strength aluminum alloy shell, providing excellent heat dissipation and corrosion resistance. The compressor is equipped with advanced sensors and controllers that can monitor and adjust the speed in real time, ensuring the system is always operating at its optimal state. The condenser 23 is coated with a nano-level hydrophobic material on its outer surface, effectively preventing condensation and extending the equipment's service life. The liquid storage tank 24 has an anti-corrosion coating to prevent metal oxidation and ensure long-term stable operation of the system. The evaporator adopts a modular design, facilitating maintenance and replacement while also enhancing the system's flexibility and scalability. The gas-liquid separator 32 features a compact design, occupies little space, and is easily integrated into existing equipment. The heating element is made of high-quality materials, ensuring stability and safety during long-term use. The circulating fan uses a low-noise motor, operating smoothly without disturbing the surrounding environment. The exhaust and return air panels are made of high-quality materials, making them durable and easy to clean.

[0060] In a preferred embodiment, to further optimize the design of the heating element mechanism 3 and the circulation device 32, a humidity sensor and a temperature sensor can be added to achieve real-time monitoring and intelligent control. The humidity sensor can detect the relative humidity inside the oven; when the humidity is too high, it automatically activates the dehumidification function to ensure the shoe materials are thoroughly dried. The temperature sensor measures the temperature inside the oven and adjusts the power output of the heating element lamps through feedback signals to maintain a constant temperature. In addition, the circulation device 32 is equipped with an air purifier to remove odors and harmful substances from the air, improving the working environment. The humidity sensor and temperature sensor are installed at the top and middle of the oven, respectively, with a sampling frequency of once per minute. The data is transmitted to the central control system via a wireless communication module. The air purifier uses a HEPA filter, which can effectively remove PM2.5 particles and bacteria and viruses, purifying the air quality.

[0061] The implementation principle of this embodiment is as follows: This embodiment achieves a complementary effect through the combination of the variable frequency air source mechanism 2 and the electric heating element mechanism 3. The variable frequency air source plays an auxiliary heating role in the initial stage of startup, while undertaking the main heating task in the normal operation stage, maintaining a constant temperature in the drying oven through efficient energy conversion and transmission. The electric heating element rapidly increases the temperature in the startup stage, while providing uniform heat distribution throughout the drying process, ensuring that every part of the shoe material is fully dried. This combination not only improves drying efficiency but also significantly reduces energy consumption and enhances the overall performance of the system.

[0062] In practical use, the control method of the drying device in this embodiment is as follows: First, the electric heating element 3 is turned on to quickly raise the initial temperature inside the drying chamber. Then, the variable frequency air source heat pump 2 is started to gradually increase the temperature and maintain a constant temperature. The required temperature and humidity values ​​are set via the control panel, and the system automatically adjusts the power output of the electric heating element and the circulating fan to maintain constant temperature and humidity. The circulating fan evenly distributes the heated air inside the drying chamber to ensure consistent temperature in all areas. The cold air generated by the evaporation device 27 is discharged to the work area through pipes to lower the ambient temperature and improve employee comfort. After the drying cycle is completed, the system automatically turns off the electric heating element and the variable frequency air source heat pump 2, and cuts off the power supply only after the temperature drops to a safe range.

[0063] like Figure 4 As shown in the figure, this application embodiment also provides a variable frequency air source and electric heating element combined drying production line. The production line is formed by connecting multiple drying devices to each other, and the products are sequentially fed into the drying devices through the first conveying device 13 and the second conveying device 17.

[0064] like Figure 5 As shown, by comparing the energy consumption of the embodiments of this application with that of simple air source or electric heating element, it is found that the embodiments of this application can further improve drying efficiency, thereby improving the space utilization and production capacity of the equipment.

[0065] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A variable frequency air energy and electric heating element combined drying device, comprising a drying device body, characterized in that, It also includes a variable frequency air energy mechanism and an electric heating element mechanism installed inside the main body of the drying device; The variable frequency air source mechanism includes a variable frequency compressor, a condenser, a liquid storage tank, an evaporator, and a gas-liquid separator. The variable frequency compressor, condenser, liquid storage tank, evaporator, and gas-liquid separator are connected in sequence through a refrigerant pipeline, and refrigerant flows through the refrigerant pipeline. The variable frequency compressor is used to compress low-pressure gas into high-pressure gas, and adjusts the speed to match the actual cooling or heating demand. The condenser is used to absorb heat from the external environment and condense the refrigerant in the refrigerant pipeline, thereby achieving a cooling effect. The liquid storage tank is used to store liquid refrigerant; The evaporation equipment includes at least two evaporators connected in parallel, which are used to absorb heat from the refrigerant and release it to the external environment, thereby achieving a heating effect. The gas-liquid separator is used to separate gaseous and liquid refrigerant, allowing the gaseous refrigerant to enter the compressor and storing the liquid refrigerant. The variable frequency air source mechanism also includes a water-oil separator installed between the variable frequency compressor and the condenser. The water-oil separator is used to separate the lubricating oil and refrigerant flowing out of the variable frequency compressor, and to make the separated refrigerant flow to the condenser, and to make the separated lubricating oil accumulate at the bottom of the water-oil separator. The bottom of the water-oil separator is connected to the gas-liquid separator via a first capillary tube, which is used to return the lubricating oil separated by the water-oil separator to the variable frequency compressor. The condenser and the gas-liquid separator are connected by a second capillary tube, which is used to directly inject refrigerant into the compressor when the temperature is too high. The drying device body includes a first drying chamber and a second drying chamber, with the variable frequency air energy mechanism located above the first drying chamber and the second drying chamber located below the first drying chamber; The first drying chamber is provided with a first heating chamber at the top and a first conveying device and a first insulation board at the bottom. The second drying chamber has a second heating chamber at the top and a second conveying device and a second insulation plate at the bottom.

2. The variable frequency air energy and electric heating element combined drying device according to claim 1, characterized in that, A solenoid valve is also provided between the condenser and the second capillary tube, which is used to control the opening and closing of the second capillary tube.

3. The variable frequency air energy and electric heating element combined drying device according to claim 2, characterized in that, A one-way valve is also provided between the second capillary tube and the gas-liquid separator to prevent refrigerant backflow.

4. The variable frequency air energy and electric heating element combined drying device according to claim 1, characterized in that, A filter and an electronic expansion valve are also provided between the liquid storage tank and the evaporation equipment. The electronic expansion valve is used to regulate the flow and pressure of the refrigerant.

5. A variable frequency air energy and electric heating element combined drying device according to claim 1, characterized in that, The heating element mechanism includes a plurality of heating element devices, which are disposed in the first heating chamber and the second heating chamber. The heating element devices include NIR, MIR and PTC.

6. A variable frequency air energy and electric heating element combined drying device according to claim 5, characterized in that, The heating element mechanism also includes several circulation devices, which are installed on both sides of the first drying chamber and the second drying chamber. The circulation devices include a circulating fan, an air outlet plate, and a return air plate.

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