Variable-frequency air energy and electric heating body combined drying device

Abstract

The invention 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, the variable-frequency air energy mechanism comprises a variable-frequency compressor, a condenser, a liquid storage tank, evaporation equipment and a gas-liquid separator, the variable-frequency compressor, the condenser, the liquid storage tank, the evaporation equipment and the gas-liquid separator are sequentially communicated through refrigerant pipelines, and refrigerants circulate in the refrigerant pipelines; the inverter compressor is used for compressing low-pressure gas into high-pressure gas, and the actual refrigerating or heating requirement is met by adjusting the rotating speed. The drying device achieves the effects of improving the drying efficiency, reducing the energy consumption and improving the production quality.

Description

Technical Field

[0001] This application relates to the technical field of drying devices, and in particular, to a combined drying device of variable-frequency air energy and electric heating elements. Background Art

[0002] The shoe drying production line is an indispensable part of the shoe manufacturing process, mainly used to accelerate the drying process of shoe materials. In the existing drying technologies, common solutions include using electric heating tubes or electric heating element tubes. Among them, the electric heating tube generates heat through resistance and conducts the heat through the air for heating, which is suitable for deep and slow heating; the electric heating element tube transfers heat through radiation and can quickly and evenly heat the surface of the object.

[0003] Although the above technical means solve some problems in the drying process to a certain extent, there are still obvious deficiencies. First, the energy consumption is high. Especially in the state of continuous constant-temperature operation for a long time, due to the use of thyristor chopper voltage regulation to adjust the power state of the heating part, the energy consumption of the electric heating tube and the electric heating element tube is significantly higher than that of the variable-frequency air energy heat pump. As Figure 6 shown, the variable-frequency air energy heat pump of the existing technology is based on the Carnot cycle principle, and its thermal efficiency value varies with the COP value according to the temperature. Secondly, the frequent start and stop of the traditional fixed-frequency compressor not only increases the energy consumption but also shortens the service life of the equipment. In addition, a single heating method is difficult to meet the drying requirements of different types of shoe materials. Especially in the case of deep heating required, using the drying device of the existing technology will result in poor drying effect and poor flexibility. Summary of the Invention

[0004] The purpose of this application is to provide a combined drying device of variable-frequency air energy and electric heating elements, which can reduce energy consumption and improve the stability and adaptability of the system while ensuring efficient drying.

[0005] The combined drying device of variable-frequency air energy and electric heating elements provided by this application adopts the following technical solutions: A combined drying device of variable-frequency air energy and electric heating elements includes a drying device body, and also includes a variable-frequency air energy mechanism and an electric heating element mechanism installed inside the drying device body; The variable-frequency air energy mechanism includes 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 connected through a refrigerant pipeline, and a refrigerant flows in the refrigerant pipeline; The variable-frequency compressor is used to compress low-pressure gas into high-pressure gas and adjust the rotation speed to match the actual refrigeration or heating demand; The condenser is used to absorb the heat of the external environment and condense the refrigerant in the refrigerant pipeline, so as to achieve the refrigeration effect; The liquid storage tank is used to store the liquid refrigerant; The evaporation device includes at least two evaporators connected in parallel, which are used to absorb the heat in the refrigerant and release it to the external environment, so as to achieve the heating effect; The gas-liquid separator is used to separate the gaseous and liquid refrigerants, so that the gaseous refrigerant enters the compressor and stores the liquid refrigerant.

[0006] By adopting the above technical solutions, the drying device of the present application combines variable-frequency air energy and electric heating elements for drying, and can achieve the following effects: when the oven starts to heat up, the electric heating elements quickly heat and radiate while the air energy heats at the same time. The combined heating makes the heating speed fast, reduces the pre-production preheating time, and improves the production efficiency. After normal operation, the high energy efficiency ratio of the air energy can keep the oven at a constant temperature, reduce the energy consumption of the oven, and improve the energy utilization rate. The variable-frequency compressor adjusts the rotation speed to match the actual refrigeration or heating demand, reduces the violent fluctuations generated by the system due to load changes, avoids the energy loss caused by the frequent start and stop of the traditional fixed-frequency compressor, and improves the stability of the system and the service life of the equipment. The gas-liquid separator separates the gaseous and liquid refrigerants, ensures that only pure gaseous refrigerant enters the compressor, protects the compressor from damage, and temporarily stores the excess refrigerant liquid, further enhancing the reliability and safety of the system. Thus, it can ensure efficient drying while reducing energy consumption and improving the stability and adaptability of the system.

[0007] Preferably, the variable-frequency air energy 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 make the separated refrigerant flow to the condenser, and make the separated lubricating oil accumulate at the bottom of the water-oil separator.

[0008] By adopting the above technical solutions, the present application effectively separates the mixture flowing out of the variable-frequency compressor through the water-oil separator. Specifically, the water-oil separator can accurately separate the lubricating oil and refrigerant, ensure that the refrigerant smoothly flows into the condenser to participate in the subsequent heat exchange process, and at the same time make the lubricating oil accumulate at the bottom of the water-oil separator for further treatment or reuse. This design effectively guarantees the stable operation of the entire variable-frequency air energy mechanism, avoids the influence of insufficient or excessive lubricating oil on the system performance, and thus improves the overall reliability and service life of the equipment.

[0009] Preferably, the bottom of the water-oil separator is connected to the gas-liquid separator through a first capillary tube. The first capillary tube is used to return the lubricating oil separated by the water-oil separator to the variable-frequency compressor.

[0010] By adopting the above technical solutions, the present application connects the gas-liquid separator through the first capillary tube, and returns the separated lubricating oil to the variable-frequency compressor. This design ensures that the variable-frequency compressor can obtain sufficient lubrication and protection during both high-frequency and low-frequency operations, avoiding internal mechanical structure wear or damage caused by insufficient lubricating oil, improving the reliability and service life of the compressor. At the same time, it also avoids excessive lubricating oil occupying the system volume, reducing the refrigerant flow rate and flow velocity, and ensuring the efficient operation of the system.

[0011] Preferably, the condenser and the gas-liquid separator are connected through a second capillary tube, and the second capillary tube is used to directly inject the refrigerant into the compressor when the temperature is too high.

[0012] By adopting the above technical solutions, the present application directly injects the refrigerant into the compressor through the second capillary tube when the temperature is too high, effectively reducing the exhaust temperature, preventing refrigerant decomposition and lubricating oil performance degradation, thereby protecting the efficiency and life of the compressor. At the same time, this helps to maintain a high system energy efficiency ratio and enhance the stability and reliability of system operation.

[0013] Preferably, an electromagnetic valve is further provided between the condenser and the second capillary tube, and the electromagnetic valve is used to control the on-off of the second capillary tube.

[0014] By adopting the above technical solutions, the present application can accurately control the on-off of the second capillary tube through the setting of the electromagnetic valve, inject the refrigerant into the compressor in time when needed, effectively reduce the exhaust temperature, and prevent high temperature from damaging the compressor. At the same time, this design helps to maintain a high system energy efficiency ratio and enhance the stability and reliability of the system.

[0015] Preferably, a check valve is further provided between the second capillary tube and the gas-liquid separator, and the check valve is used to prevent the refrigerant from flowing backward.

[0016] By adopting the above technical solutions, the present application effectively prevents the reverse flow of the refrigerant between the second capillary tube and the gas-liquid separator through the setting of the check valve. This design ensures that the refrigerant flows in a predetermined direction, avoiding system pressure instability problems caused by reverse flow, thereby improving the operation reliability and safety of the entire system. Combining the summary solutions, each component in the variable-frequency air energy mechanism works together, while maintaining high-efficiency heating, further optimizing the system performance, reducing energy consumption, and extending the service life of the equipment. The role of the check valve significantly improves the stable operation ability of the system under high-temperature conditions and provides a better working environment for the compressor.

[0017] Preferably, a filter and an expansion valve are further provided between the liquid storage tank and the evaporation device, and the expansion valve is used to adjust the flow rate and pressure of the refrigerant.

[0018] By adopting the above technical solutions, the expansion valve of the present application can regulate the flow rate and pressure of the refrigerant to ensure the stability of the system operation. The filter can remove impurities in the refrigerant to ensure the purity of the refrigerant, thereby extending the service life of the equipment and improving the reliability and energy efficiency ratio of the system.

[0019] 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. A first heating chamber is provided at the top of the first drying chamber, and a first conveying device and a first heat preservation board are provided at the bottom of the first drying chamber. A second heating chamber is provided at the top of the second drying chamber, and a second conveying device and a second heat preservation board are provided at the bottom of the second drying chamber.

[0020] By adopting the above technical solutions, the present application realizes the zoning design of the drying device by setting the first drying chamber and the second drying chamber. The first drying chamber and the second drying chamber are respectively provided with independent heating chambers, conveying devices and heat preservation boards. This structure can perform differential processing for different drying stages or different types of products, improving the flexibility and adaptability of the drying process. The specific effects are as follows: The up-and-down distribution design of the first drying chamber and the second drying chamber makes reasonable use of space, facilitating the realization of multi-layer processing processes, and improving the space utilization rate and production capacity of the equipment. The first heating chamber and the second heating chamber can be respectively configured with different heating parameters, and combined with the characteristics of the variable-frequency air energy mechanism, the space utilization rate and production capacity of the equipment are improved. The first conveying device and the second conveying device are equipped to ensure the orderly transmission of products during the drying process, avoiding pollution and efficiency losses that may be brought by manual intervention. The use of the first heat preservation board and the second heat preservation board effectively reduces heat dissipation, improves energy utilization efficiency, reduces energy consumption costs, and at the same time ensures the uniformity and stability of the temperature in the drying chamber.

[0021] Preferably, the electric heating element mechanism includes a plurality of electric heating element devices. The plurality of electric heating element devices are arranged in the first heating chamber and the second heating chamber. The electric heating element device includes NIR, MIR and PTC.

[0022] By adopting the above technical solutions, the electric heating element mechanism of the present application includes a plurality of electric heating element devices. This design enables the drying device to quickly heat and radiate by using the electric heating elements at startup, heat simultaneously with the air energy, accelerate the heating rate, shorten the pre-production preheating time, and improve production efficiency. The electric heating element device includes supporting accessories such as NIR, MIR, and PTC. At the same time, after normal operation, the electric heating element device can assist the air energy to efficiently maintain the constant temperature of the oven, further reducing energy consumption.

[0023] Preferably, the electric heating element mechanism further includes a plurality of circulation devices, which are installed on both sides of the first drying chamber and the second drying chamber. The circulation devices include circulation fans, air outlet plates and air return plates.

[0024] By adopting the above technical solution, the plurality of circulation devices added to the electric heating element mechanism of the present application can effectively promote the flow of hot air in the first drying chamber and the second drying chamber. Specifically, the circulation fans drive the air to form forced convection in the drying chamber, making the heat distribution more uniform, avoiding problems such as local overheating or uneven heating, thereby improving the drying quality of the products. The design of the air outlet plates and air return plates further optimizes the air flow organization, ensuring that the hot air can efficiently cover the surface of the items to be dried, accelerating the moisture condensation speed, significantly shortening the drying time, and improving the production efficiency. In addition, this uniform and efficient heat transfer method also helps to reduce energy consumption and achieve the purpose of energy conservation.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The combined heating method enables the drying device to quickly heat and radiate through the electric heating element at startup, heating simultaneously with the air energy, with a fast heating rate, reducing the pre-production preheating time, and improving the production efficiency; 2. After normal operation, the variable-frequency air energy mechanism maintains a high energy efficiency ratio, keeping the oven in a constant temperature state and significantly reducing energy consumption; 3. The variable-frequency compressor adjusts the rotation speed to match the actual refrigeration or heating demand, reducing the severe fluctuations generated by the system due to load changes, avoiding the energy loss caused by the frequent startup and stop of the traditional fixed-frequency compressor, improving the stability of the system and the service life of the equipment. By changing the frequency-voltage characteristics, the low power factor efficiency of thyristor voltage regulation is also avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the overall structural schematic diagram of an embodiment of the present application; Figure 2 is the pipeline schematic diagram of the variable-frequency air energy mechanism of an embodiment of the present application; Figure 3 is the sectional structural schematic diagram of an embodiment of the present application; Figure 4 is the structural schematic diagram of the drying production line of an embodiment of the present application; Figure 5 is the comparison chart of the energy consumption through testing with pure air energy or electric heating element of an embodiment of the present application; Figure 6 is the table of the change of the COP value of the heat efficiency value of the prior art according to the temperature; In the figure, 1 is the main body of the drying device; 11 is the first drying chamber; 12 is the first heating chamber; 13 is the first conveying device; 14 is the first heat preservation board; 15 is the second drying chamber; 16 is the second heating chamber; 17 is the second conveying device; 18 is the second heat preservation board; 2 is the variable frequency air energy mechanism; 21 is the variable frequency compressor; 22 is the oil-water separator; 23 is the condenser; 24 is the liquid storage tank; 25 is the filter; 26 is the electronic expansion valve; 27 is the evaporation device; 28 is the first capillary tube; 29 is the second capillary tube; 30 is the solenoid valve; 31 is the check valve; 32 is the gas-liquid separator; 3 is the electric heating element mechanism; 31 is the electric heating element device; 32 is the circulation device. Detailed implementation mode

[0027] The following is combined with the attached Figure 1 - attached Figure 5 The technical solutions in the embodiments of the present application are clearly and completely described. The described embodiments are only possible technical implementations of the present invention, not all possible implementations. Those skilled in the art can fully combine the embodiments of the present invention to obtain other embodiments without creative labor, and these embodiments are also within the protection scope of the present invention. The inventor of the present application found that the existing heating and drying equipment of the shoe-making drying production line has problems such as high energy consumption and narrow temperature adjustment range. Therefore, the present application mainly adopts the technical solution of combining variable frequency air energy and electric heating elements for shoe-making drying, achieving the purpose of improving the drying efficiency while reducing energy consumption. The following is a further detailed description of the present application.

[0028] The embodiment of the present application provides a combined drying device of variable frequency air energy and electric heating elements. Referring to Figure 1 、 Figure 2 And Figure 3 , it includes the main body 1 of the drying device, and also includes a variable frequency air energy mechanism 2 and an electric heating element mechanism 3 installed inside the main body 1 of the drying device. The variable frequency air energy 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 evaporation device 27, a first capillary tube 28, a second capillary tube 29, a solenoid valve 30, a check valve 31 and a gas-liquid separator 32. Among them, the variable frequency compressor 21, the condenser 23, the liquid storage tank 24, the evaporation device 27 and the gas-liquid separator 32 are sequentially connected through a refrigerant pipeline to form a loop, and a refrigerant flows in the refrigerant pipeline.

[0029] In the embodiment of this application, the variable-frequency compressor 21 is one of the core components of the entire variable-frequency air energy mechanism 2. The main function of the variable-frequency compressor 21 is to compress low-pressure gas into high-pressure gas and adjust the rotational speed to match the actual refrigeration or heating demand. This design reduces the drastic fluctuations of the system caused by load changes and improves the stability and energy efficiency ratio of the system. The variable-frequency compressor 21 can be a screw-type or scroll-type compressor. These two types have their own advantages in performance, and the appropriate model can be selected according to specific applications. For example, screw-type compressors are suitable for large-capacity and high-load situations, while scroll-type compressors are suitable for medium and small-capacity and light-load occasions.

[0030] In the embodiment of this application, the main function of the condenser 23 is to absorb the heat from the external environment and condense the refrigerant in the refrigerant pipeline, so as to achieve the refrigeration effect. The condenser 23 is usually made of copper pipes because copper has good heat conduction performance and can transfer heat quickly. To improve the heat exchange efficiency, a hydrophilic coating can be applied on the surface of the condenser 23, which can increase the contact area of moisture and accelerate the condensation process. In addition, the condenser 23 can also adopt a fin structure to increase the surface area and further improve the heat dissipation effect.

[0031] In the embodiment of this application, the main function of the liquid storage tank 24 is to store the liquid refrigerant to ensure sufficient refrigerant supply in the system. The liquid storage tank 24 is generally made of stainless steel, which has strong corrosion resistance and a long service life. A float valve is provided inside the liquid storage tank 24 to automatically adjust the liquid level and maintain a stable refrigerant storage volume. The volume of the liquid storage tank 24 needs to be reasonably designed according to the actual working conditions. Being too large or too small will affect the operation effect of the system.

[0032] In the embodiment of this application, the evaporation device 27 includes at least two parallel evaporators. The main function of the evaporator is to absorb the heat in the refrigerant and release it to the external environment, so as to achieve the heating effect. The evaporator is usually also made of copper pipes, and the outer surface is covered with aluminum foil fins to increase the heat exchange area. The design of the double evaporator can improve the reliability and stability of the system. Even if one evaporator fails, the other can still continue to work to ensure the continuity of production.

[0033] In the embodiment of this application, the main function of the gas-liquid separator 32 is to separate the gaseous and liquid refrigerants, so that the gaseous refrigerant enters the compressor and stores the liquid refrigerant. The gas-liquid separator 32 usually adopts the cyclone separation principle to separate the gaseous and liquid substances through centrifugal force. The inlet and outlet of the gas-liquid separator 32 should be designed in a trumpet shape to reduce resistance and improve the separation efficiency. The separated liquid refrigerant can flow back to the liquid storage tank 24 through the capillary tube for reuse.

[0034] The oil-water separator 22 of the embodiment of the present application 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 to the variable frequency compressor 21. When the system is in working state, the lubricating oil will be discharged from the variable frequency compressor 21 together with the refrigerant, and finally return to the variable frequency compressor 21 through the circulation of the system. The lack of oil in the variable frequency compressor 21 will lead to a lack of sufficient lubricating oil for lubrication inside the variable frequency compressor 21, which will wear or damage the internal mechanical structure of the variable frequency compressor 21 and affect the life of the variable frequency compressor 21; but too much oil will occupy the volume in the system, reduce the circulation volume and circulation speed of the refrigerant, and in severe cases, cause a decrease in the heating effect. The variable frequency compressor 21 adjusts the heating amount by adjusting the operating frequency, which puts higher requirements 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 can be fully lubricated and protected when working at high and low frequencies. 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 .

[0035] The condenser 23 and the gas-liquid separator 32 of the embodiment of the present application are connected to form a loop through the second capillary tube 29, and the second capillary tube 29 is used to directly spray the refrigerant into the variable frequency compressor 21 when the temperature is too high. The on and off of the second capillary tube 29 is controlled by the solenoid valve 30 to ensure that the refrigerant is sprayed into the suction pipeline of the compressor at the appropriate time and amount. The one-way valve 31 is used to prevent the refrigerant from flowing back.

[0036] The filter 25 and expansion valve 26 of the embodiment of the present application are arranged between the liquid storage tank 24 and the evaporation device 27. The main function of the filter 25 is to remove impurities in the refrigerant to prevent clogging of the pipeline and affecting the normal operation of the system. The filter 25 usually adopts a multi-layer filter structure, and the aperture of each layer of the filter gradually decreases to form a step-by-step filtering effect. The expansion valve 26 is used to adjust the flow and pressure of the refrigerant, maintain a certain degree of superheat, and ensure the stability and reliability of the system. The expansion valve 26 can be manually adjusted according to the actual working conditions, or it can be dynamically adjusted through an automated control system to adapt to different working conditions.

[0037] In the specific implementation process, the filter 25 is arranged between the liquid storage tank 24 and the evaporation device 27, and adopts a multi-layer filter structure, and the apertures of each layer of the filter are 50μm, 25μm and 10μm, respectively, to form a three-level filtering effect. The filter is made of stainless steel, which has strong corrosion resistance and is not easy to deform. The expansion valve 26 adopts an electronic expansion valve 26 with a built-in microprocessor, which can automatically adjust the opening according to real-time data, with high precision and fast response speed.

[0038] like Figure 3As shown in the figure, the drying device body 1 of the embodiment of the present application includes a first drying chamber 11 and a second drying chamber 15. The variable-frequency air energy mechanism 2 is located above the first drying chamber 11, and the second drying chamber 15 is located below the first drying chamber 11. A first heating chamber 12 is provided at the top of the first drying chamber 11. A first conveying device 13 and a first heat preservation board 14 are provided at the bottom of the first drying chamber 11. A second heating chamber 16 is provided at the top of the second drying chamber 15. A second conveying device 17 and a second heat preservation board 18 are provided at the bottom of the second drying chamber 15. The first drying chamber 11 and the second drying chamber 15 are separated by a heat insulation wall to reduce heat loss and improve energy utilization efficiency. Both the first conveying device 13 and the second conveying device 17 adopt belt conveyors, and anti-slip stripes are provided on the conveyor belts to prevent the shoe materials from slipping during transportation. The first heat preservation board 14 and the second heat preservation board 18 can adopt polyurethane foam materials, which have excellent heat preservation performance and can effectively maintain the temperature in the drying chamber.

[0039] As Figure 3 shown in the figure, the electric heating element mechanism 3 of the embodiment of the present application includes a plurality of electric heating element devices 31 and a circulation device 32. The electric heating element devices 31 are arranged in the first heating chamber 12 and the second heating chamber 16, and mainly include electric heating element lamps and lamp covers. The selection of the electric heating element is very important. Commonly used ones include electric heating tubes, carbon fiber electric heating element lamps, and quartz electric heating element lamps. The carbon fiber electric heating element lamp is characterized by fast heating and long service life, and is suitable for occasions that require rapid heating; the quartz electric heating element lamp has a higher thermal efficiency and is suitable for continuous heating scenarios. The function of the lamp cover is to protect the electric heating element, prevent the influence of dust and other impurities, and at the same time can reflect light to improve the heating efficiency.

[0040] As Figure 3 shown in the figure, the circulation device 32 of the embodiment of the present application is installed on both sides of the first drying chamber 11 and the second drying chamber 15, and includes a circulation fan, an air outlet board, and an air return board. The circulation fan is responsible for evenly distributing the heated air in the drying chamber to ensure that the temperature in each area is consistent. The design of the air outlet board and the air return board needs to consider the direction and speed of air flow, and usually adopts a louvered structure to facilitate the adjustment of air volume and air direction. The working mode of the circulation device 32 can be set to be turned on and off regularly, or intelligently controlled according to real-time temperature feedback to save energy.

[0041] In the specific implementation process, the variable-frequency air energy mechanism 2 and the electric heating element mechanism 3 cooperate with each other to jointly achieve an efficient drying effect. When starting up, the electric heating element lamp heats up quickly, causing the temperature inside the drying oven to rise rapidly and shortening the preheating time. Subsequently, the variable-frequency air energy mechanism 2 starts to work. Through efficient energy conversion and transmission, it maintains a constant temperature state and reduces energy consumption. The combination of the two heating methods not only improves the drying speed but also ensures that the shoe materials receive a uniform heat distribution, avoiding local overheating or overcooling. The variable-frequency compressor 21 adopts a high-strength aluminum alloy shell, which has good heat dissipation performance and corrosion resistance. Inside the compressor, advanced sensors and controllers are equipped, which can monitor and adjust the rotational speed in real time to ensure that the system is always in the best operating state. A layer of nano-level hydrophobic material is sprayed on the outer surface of the condenser 23, which can effectively prevent condensation and extend the service life of the equipment. The inside of the liquid storage tank 24 is provided with an anti-corrosion coating to prevent metal oxidation and ensure the long-term stable operation of the system. The evaporator adopts a modular design, which is convenient for maintenance and replacement. At the same time, it also enhances the flexibility and expandability of the system. The gas-liquid separator 32 is designed compactly, occupies little space, and is easy to integrate into existing equipment. The electric heating element is selected from high-quality material raw materials to ensure the stability and safety during long-term use. The circulating fan adopts a low-noise motor, runs smoothly, and will not cause interference to the surrounding environment. The air outlet plate and the air return plate are made of high-quality materials, which are durable and easy to clean.

[0042] In a preferred implementation manner, in order to further optimize the design of the circulating device 32 of the electric heating element mechanism 3, a humidity sensor and a temperature sensor can also be added to achieve real-time monitoring and intelligent control. The humidity sensor can detect the relative humidity inside the drying oven. When the humidity is too high, it automatically starts the dehumidification function to ensure that the shoe materials are dried thoroughly. The temperature sensor is used to measure the temperature inside the drying oven. By adjusting the power output of the electric heating element lamp through the feedback signal, a constant temperature is maintained. In addition, the circulating device 32 is also equipped with an air purifier, which can remove odors and harmful substances in the air and improve the working environment. The humidity sensor and the temperature sensor are respectively installed at the top and middle of the drying oven, and the sampling frequency is once per minute. The data is sent to the central control system through a wireless communication module. The air purifier adopts a HEPA filter, which can effectively remove PM2.5 particulate matter and bacteria and viruses, and purify the air quality.

[0043] The implementation principle of this embodiment is as follows: In the embodiment of this application, a complementary effect is achieved through the combination of the variable-frequency air energy mechanism 2 and the electric heating element mechanism 3. The variable-frequency air energy plays an auxiliary heating role in the initial stage of startup, while undertaking the main heating task during the normal working stage. Through efficient energy conversion and transmission, a constant temperature inside the oven is maintained. The electric heating element rapidly increases the temperature in the startup stage and provides a uniform heat distribution throughout the drying process, ensuring that every part of the shoe material can be fully dried. This combination method not only improves the drying efficiency but also significantly reduces energy consumption and enhances the overall performance of the system.

[0044] During the actual use process, the control method of the drying device in the embodiment of this application is as follows: First, turn on the electric heating element mechanism 3 to rapidly increase the initial temperature inside the drying chamber, and then start the variable-frequency air energy mechanism 2 to gradually increase the temperature and maintain a constant temperature. Set the required temperature and humidity values through the control panel, and the system automatically adjusts the power output of the electric heating element and the circulation fan to maintain a constant temperature and humidity. The circulation fan evenly distributes the heated air inside the drying chamber to ensure that the temperature in each area is the same. The cold air generated by the evaporation device 27 is discharged to the working area through the pipeline to reduce the environmental temperature in the working area and improve the comfort of employees. After completing the drying cycle, the system automatically shuts down the electric heating element and the variable-frequency air energy mechanism 2, and cuts off the power supply after the temperature drops to a safe range.

[0045] As Figure 4 shown, the embodiment of this application also provides a combined drying production line of variable-frequency air energy and electric heating element. The production line is formed by connecting multiple drying devices, and the products are sequentially fed into the drying devices through the first conveying device 13 and the second conveying device 17.

[0046] As Figure 5 shown, by comparing the test of the embodiment of this application with the energy consumption of pure air energy or electric heating element, it is obtained that the embodiment of this application can further improve the drying efficiency, and improve the space utilization rate and production capacity of the equipment.

[0047] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A variable frequency air energy and electric heating element combined drying device, comprising a drying device body (1), characterized in that: It also includes a variable frequency air energy mechanism (2) and an electric heating body mechanism (3) installed inside the drying device body (1); The variable frequency air energy mechanism (2) comprises a variable frequency compressor (21), a condenser (23), a liquid storage tank (24), an evaporation device (27) and a gas-liquid separator (32); the variable frequency compressor (21), the condenser (23), the liquid storage tank (24), the evaporation device (27) and the gas-liquid separator (32) are connected in sequence via a refrigerant pipeline, and a refrigerant flows in the refrigerant pipeline; The variable frequency compressor (21) is used to compress low-pressure gas into high-pressure gas, and adjust the rotation speed to match the actual cooling or heating demand; The condenser (23) is used to absorb heat from the external environment and condense the refrigerant in the refrigerant pipeline, thereby achieving a refrigeration effect; The liquid storage tank (24) is used to store liquid refrigerant; The evaporation device (27) comprises at least two evaporators connected in parallel, which are used to absorb heat in the refrigerant and release it to the external environment, thereby achieving a heating effect; The gas-liquid separator (32) is used to separate the gaseous refrigerant from the liquid refrigerant, allowing the gaseous refrigerant to enter the compressor and storing the liquid refrigerant.

2. A variable frequency air energy and electric heating body combined drying device according to claim 1, characterized in that: The variable frequency air energy mechanism (2) further comprises a water-oil separator installed between the variable frequency compressor (21) and the condenser (23), wherein the water-oil separator is used to separate the lubricating oil and the refrigerant flowing out of the variable frequency compressor (21), and to make the separated refrigerant flow to the condenser (23), so that the separated lubricating oil accumulates at the bottom of the water-oil separator.

3. A variable frequency air energy and electric heating body combined drying device according to claim 2, characterized in that: The bottom of the water-oil separator is connected to the gas-liquid separator (32) via a first capillary tube (28), and the first capillary tube (28) is used to return the lubricating oil separated by the water-oil separator to the variable frequency compressor (21).

4. A variable frequency air energy and electric heating body combined drying device according to claim 1, characterized in that: The condenser (23) and the gas-liquid separator (32) are connected via a second capillary tube (29), and the second capillary tube (29) is used to spray the refrigerant directly into the compressor when the temperature is too high.

5. A variable frequency air energy and electric heating body combined drying device according to claim 4, characterized in that: A solenoid valve (30) is also provided between the condenser (23) and the second capillary tube (29), and the solenoid valve (30) is used to control the on and off of the second capillary tube (29).

6. A variable frequency air energy and electric heating body combined drying device according to claim 5, characterized in that: A one-way valve (31) is also provided between the second capillary tube (29) and the gas-liquid separator (32), and the one-way valve (31) is used to prevent the refrigerant from flowing back.

7. A variable frequency air energy and electric heating body combined drying device according to claim 1, characterized in that: A filter (25) and an electronic expansion valve (26) are also provided between the liquid storage tank (24) and the evaporation device (27), and the electronic expansion valve (26) is used to adjust the flow rate and pressure of the refrigerant.

8. A variable frequency air energy and electric heating body combined drying device according to any one of claims 1 to 7, characterized in that: The drying device body (1) comprises a first drying chamber (11) and a second drying chamber (15), the variable frequency air energy mechanism (2) is located above the first drying chamber (11), and the second drying chamber (15) is located below the first drying chamber (11); A first heating chamber (12) is provided at the top of the first drying chamber (11), and a first conveying device (13) and a first insulation board (14) are provided at the bottom of the first drying chamber (11); A second heating chamber (16) is provided at the top of the second drying chamber (15), and a second conveying device (17) and a second heat-insulating plate (18) are provided at the bottom of the second drying chamber (15).

9. A variable frequency air energy and electric heating body combined drying device according to claim 8, characterized in that: The electric heating body mechanism (3) comprises a plurality of electric heating body devices (31), wherein the plurality of electric heating body devices (31) are arranged in the first heating chamber (12) and the second heating chamber (16), and the electric heating body devices (31) comprise NIR, MIR and PTC.

10. A variable frequency air energy and electric heating body combined drying device according to claim 9, characterized in that: The electric heating body mechanism (3) also includes a plurality of circulation devices (32), and the circulation devices (32) are installed on both sides of the first drying chamber (11) and the second drying chamber (15). The circulation devices (32) include a circulation fan, an air outlet plate and an air return plate.

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