Efficient circulating hot air drying device for cable production

Abstract

The application discloses a high-efficiency circulating hot air drying device for cable production and relates to the technical field of cable production, aiming to solve the problem of low heat efficiency of the existing hot air drying device. The device comprises a drying box body, a double-stage hot air generating module, a hot air circulating module and a temperature control module. The drying box body is a sealed cavity structure, and cable inlets and outlets are arranged at two ends of the drying box body. The double-stage hot air generating module comprises a first-stage heat pump heating device and a second-stage electric heating device. The air outlet of the first-stage heat pump heating device is in communication with the air inlet of the second-stage electric heating device, and the air outlet of the second-stage electric heating device is in communication with the air inlet of the drying box body. The hot air circulating module comprises a circulating fan and a circulating air duct. One end of the circulating air duct is in communication with the air outlet of the drying box body, and the other end is in communication with the air inlet of the first-stage heat pump heating device. The application has the advantages of high heat efficiency and low energy consumption.

Description

Technical Field

[0001] This invention relates to the field of cable production technology, and more specifically, to a high-efficiency circulating hot air drying device for cable production. Background Technology

[0002] In fields such as power transmission, communication networks, and industrial equipment connections, cables serve as the core transmission carrier, and their performance stability and service life directly determine the operational reliability of downstream systems.

[0003] During the cable production process, the insulation or sheath layer of the extruded cable needs to be dried to remove moisture from the material and ensure the electrical and mechanical properties and service life of the cable.

[0004] Currently, hot air drying equipment is commonly used in the industry to dry cables. Traditional hot air drying equipment usually uses a single electric heating or gas heating method as the hot air generation module.

[0005] While single electric heating directly converts electrical energy into heat, its energy utilization rate is low, especially when high-temperature drying is required, resulting in huge power consumption. Gas heating, although having relatively low fuel costs, generates a large amount of waste heat during combustion, and the hot air is directly discharged after use, leading to significant heat waste and low thermal efficiency. Therefore, we propose a high-efficiency circulating hot air drying device for cable production. Summary of the Invention

[0006] The purpose of this invention is to provide a high-efficiency circulating hot air drying device for cable production, which aims to solve the problem of low thermal efficiency in existing hot air drying devices.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-efficiency circulating hot air drying device for cable production, the device comprising a drying chamber, a two-stage hot air generation module, a hot air circulation module, and a temperature control module;

[0008] The drying chamber is a sealed cavity structure with a cable inlet and a cable outlet at each end.

[0009] The dual-stage hot air generating module includes a first-stage heat pump heating device and a second-stage electric heating device. The air outlet of the first-stage heat pump heating device is connected to the air inlet of the second-stage electric heating device, and the air outlet of the second-stage electric heating device is connected to the air inlet of the drying chamber.

[0010] The hot air circulation module includes a circulating fan and a circulating duct. One end of the circulating duct is connected to the air outlet of the drying chamber, and the other end is connected to the air inlet of the first-stage heat pump heating device. The circulating fan is installed on the circulating duct and is used to drive the hot air to circulate between the drying chamber and the dual-stage hot air generation module.

[0011] The temperature control module includes a temperature sensor and a controller. The temperature sensor is installed inside the drying chamber to detect the hot air temperature inside the drying chamber in real time. The controller calculates and controls the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device through an adjustment algorithm.

[0012] Preferably, the first-stage heat pump heating device includes a compressor, a condenser, an expansion valve, and an evaporator. The evaporator is located in the circulating air duct and is used to absorb waste heat in the circulating hot air. The air outlet of the condenser is connected to the air inlet of the second-stage electric heating device. The compressor, condenser, expansion valve, and evaporator form a closed loop. The controller controls the heating power of the first-stage heat pump heating device by adjusting the operating frequency of the compressor.

[0013] Preferably, the second-stage electric heating device includes a heating housing and a plurality of electric heating tubes disposed within the heating housing, and the controller adjusts the heating power of the second-stage electric heating device by controlling the output current of the electric heating tubes.

[0014] Preferably, the inner wall of the drying chamber is provided with a high-temperature resistant reflective layer, which is made of stainless steel mirror material to reflect the heat of hot air and reduce heat loss of the drying chamber.

[0015] Preferably, the circulating air duct is further provided with an air filter assembly, which includes a primary filter and a high-efficiency filter. The primary filter is located near the air outlet of the drying chamber, and the high-efficiency filter is located near the air inlet of the first-stage heat pump heating device, for filtering dust and impurities in the circulating hot air.

[0016] Preferably, the formula for the adjustment algorithm used to control the heating power of the first-stage heat pump heating device is:

[0017] ;

[0018] In the formula, The target heating power of the heat pump heating device, , , These are the proportional coefficient, integral coefficient, and derivative coefficient of the heat pump control loop, respectively. The target temperature for the drying chamber. The actual temperature detected by the temperature sensor. To control the cycle.

[0019] Preferably, the formula for the adjustment algorithm used to control the heating power of the second-stage electric heating device is:

[0020] ;

[0021] In the formula, The target heating power of the electric heating device. This is the proportional coefficient for the electric heating control circuit. The actual heating efficiency of the first-stage heat pump heating device is given by the calculated result. At that time, the controller stops the second-stage electric heating device from operating.

[0022] Preferably, when the controller calculates the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device according to the adjustment algorithm, it simultaneously calculates and adjusts the speed of the circulating fan. The speed adjustment formula is as follows:

[0023] ;

[0024] In the formula, The target speed of the circulating fan. This is the reference speed of the circulating fan. To ensure the total heating power matches the hot air circulation volume, thereby improving heat exchange efficiency.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. This invention enables hot air to circulate in a closed loop between the drying chamber and the dual-stage hot air generation module through a hot air circulation module, avoiding direct heat loss. The evaporator of the first-stage heat pump heating device is located in the circulation duct, which can absorb the waste heat of the circulating hot air and convert it into heating energy. It adopts a dual-stage mode of heat pump priority heating plus electric heating supplemented on demand, and combines the adjustment algorithm of the temperature control module to accurately control the heating power, reducing energy waste.

[0027] 2. When calculating the power of the dual-stage hot air generating module, this invention simultaneously adjusts the speed of the circulating fan according to the speed adjustment formula, so that the speed of the circulating fan dynamically changes with the total power of the dual-stage hot air generating module, ensuring that the hot air circulation volume matches the heating power, effectively improving the heat exchange efficiency between the hot air and the cable in the drying chamber, and avoiding the problem of insufficient heat exchange caused by the mismatch between air volume and power. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the architecture of the present invention. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0030] Example 1

[0031] A high-efficiency circulating hot air drying device for cable production, the device includes a drying chamber, a two-stage hot air generation module, a hot air circulation module, and a temperature control module;

[0032] The drying chamber has a sealed cavity structure with a cable inlet and a cable outlet at each end.

[0033] The dual-stage hot air generation module includes a first-stage heat pump heating device and a second-stage electric heating device. The air outlet of the first-stage heat pump heating device is connected to the air inlet of the second-stage electric heating device, and the air outlet of the second-stage electric heating device is connected to the air inlet of the drying chamber.

[0034] The hot air circulation module includes a circulating fan and a circulating duct. One end of the circulating duct is connected to the air outlet of the drying chamber, and the other end is connected to the air inlet of the first-stage heat pump heating device. The circulating fan is installed on the circulating duct to drive the hot air to circulate between the drying chamber and the dual-stage hot air generation module.

[0035] The temperature control module includes a temperature sensor and a controller. The temperature sensor is installed inside the drying chamber to detect the hot air temperature inside the drying chamber in real time. The controller calculates and controls the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device through an adjustment algorithm.

[0036] In this embodiment, the first-stage heat pump heating device includes a compressor, a condenser, an expansion valve, and an evaporator. The evaporator is located in the circulating air duct and is used to absorb the waste heat in the circulating hot air. The air outlet of the condenser is connected to the air inlet of the second-stage electric heating device. The compressor, condenser, expansion valve, and evaporator form a closed loop. The controller controls the heating power of the first-stage heat pump heating device by adjusting the operating frequency of the compressor.

[0037] In this embodiment, the second-stage electric heating device includes a heating shell and multiple electric heating tubes disposed within the heating shell. The controller adjusts the heating power of the second-stage electric heating device by controlling the output current of the electric heating tubes.

[0038] In this embodiment, the inner wall of the drying chamber is provided with a high-temperature resistant reflective layer, which is made of stainless steel mirror material and is used to reflect the heat of hot air and reduce the heat loss of the drying chamber.

[0039] In this embodiment, an air filtration assembly is also provided on the circulating air duct. The air filtration assembly includes a primary filter and a high-efficiency filter. The primary filter is located near the air outlet of the drying chamber, and the high-efficiency filter is located near the air inlet of the first-stage heat pump heating device. It is used to filter dust and impurities in the circulating hot air.

[0040] The formula for the adjustment algorithm used in this embodiment to control the heating power of the first-stage heat pump heating device is as follows:

[0041] ;

[0042] In the formula, The target heating power of the heat pump heating device, , , These are the proportional coefficient, integral coefficient, and derivative coefficient of the heat pump control loop, respectively. The target temperature for the drying chamber. The actual temperature detected by the temperature sensor. To control the cycle, this formula uses a proportional element... Temperature deviation Converted into basic regulating power, it quickly responds to deviations; the integral stage... Deviation with control cycle The cumulative quantity is calculated to eliminate steady-state error; the differential element is processed through... The formula is obtained by calculating the rate of change of deviation, suppressing temperature fluctuations, and finally superimposing the adjustment amounts of the three factors.

[0043] The formula for the adjustment algorithm used in this embodiment to control the heating power of the second-stage electric heating device is as follows:

[0044] ;

[0045] In the formula, The target heating power of the electric heating device. This is the proportional coefficient for the electric heating control circuit. The actual heating efficiency of the first-stage heat pump heating device is given by the calculated result. At that time, the controller stops the second-stage electric heating device from operating. This formula first passes through... Temperature deviation Converted to the theoretical auxiliary heating power base value; then subtract the actual effective heating power of the heat pump. This yields the additional power required for electric heating; while also considering... Electric heating does not require operation, thus yielding this formula.

[0046] In this embodiment, efficient, precise, and energy-saving cable drying is achieved through multi-module collaboration. The sealed drying chamber, combined with a high-temperature reflective layer made of stainless steel mirror material on the inner wall, effectively reflects the heat from the hot air, significantly reducing heat loss from the drying chamber and ensuring stable heat retention within it. The dual-stage hot air generation module uses a first-stage heat pump heating device as its core. Its evaporator absorbs waste heat from the circulating hot air, achieving heat recovery and reuse, thus reducing energy consumption. The second-stage electric heating device serves as supplementary heating. The combination of these two methods satisfies the heat required for drying while avoiding the energy consumption drawbacks of a single heating method. The hot air circulation module... A circulating fan drives hot air to circulate between the drying chamber and the dual-stage hot air generation module, ensuring that the hot air fully acts on the cable and improving heat utilization efficiency. At the same time, the combination of primary and high-efficiency filters in the circulating air duct can filter dust and impurities in the circulating hot air layer by layer, preventing impurities from adhering to the cable surface and affecting product quality or clogging components. The temperature control module monitors the temperature inside the chamber in real time with a temperature sensor. The controller uses an adjustment algorithm to precisely control the heating power of the first-stage heat pump heating device and the second-stage electric heating device, achieving precise temperature control inside the chamber and avoiding the impact of temperature fluctuations on the drying quality of the cable.

[0047] Example 2

[0048] The difference between this embodiment and Embodiment 1 is that when the controller calculates the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device according to the adjustment algorithm, it simultaneously calculates and adjusts the speed of the circulating fan. The speed adjustment formula is as follows:

[0049] ;

[0050] In the formula, The target speed of the circulating fan. This is the reference speed of the circulating fan. To ensure the total heating power matches the hot air circulation volume and improve heat exchange efficiency, this formula is based on the reference speed of the circulating fan. Corresponding to the total heating power reference value Based on the relationships that airflow is directly proportional to rotational speed and total heating power is directly proportional to airflow, it can be deduced that total heating power is approximately proportional to the square of rotational speed. The ratio of total heating power... After taking the square root and Multiply them to get the formula.

[0051] This embodiment simultaneously adjusts the circulating fan speed based on the total heating power and the reference parameters of the circulating fan while calculating and adjusting the heating power of the first-stage heat pump heating device and the second-stage electric heating device. The target circulating fan speed, matching the real-time total heating power, is then calculated using a formula. This synchronous adjustment method ensures that the hot air circulation volume is adjusted in real time according to changes in heating power, avoiding insufficient heat exchange or energy waste caused by a constant hot air circulation volume despite changes in heating power. When the heating power increases, the circulating fan speed increases accordingly to increase the hot air circulation volume, allowing the generated heat to contact the cable more quickly and fully for heat exchange. When the heating power decreases, the circulating fan speed decreases synchronously to reduce unnecessary energy consumption, further improving the energy efficiency of the device while ensuring stable cable drying performance.

[0052] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A high-efficiency circulating hot air drying device for cable production, characterized in that, The device includes a drying chamber, a two-stage hot air generation module, a hot air circulation module, and a temperature control module. The drying chamber is a sealed cavity structure with a cable inlet and a cable outlet at each end. The dual-stage hot air generating module includes a first-stage heat pump heating device and a second-stage electric heating device. The air outlet of the first-stage heat pump heating device is connected to the air inlet of the second-stage electric heating device, and the air outlet of the second-stage electric heating device is connected to the air inlet of the drying chamber. The hot air circulation module includes a circulating fan and a circulating duct. One end of the circulating duct is connected to the air outlet of the drying chamber, and the other end is connected to the air inlet of the first-stage heat pump heating device. The circulating fan is installed on the circulating duct and is used to drive the hot air to circulate between the drying chamber and the dual-stage hot air generation module. The temperature control module includes a temperature sensor and a controller. The temperature sensor is installed inside the drying chamber to detect the hot air temperature inside the drying chamber in real time. The controller calculates and controls the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device through an adjustment algorithm.

2. The high-efficiency circulating hot air drying device for cable production according to claim 1, characterized in that, The first-stage heat pump heating device includes a compressor, a condenser, an expansion valve, and an evaporator. The evaporator is located in the circulating air duct and is used to absorb the waste heat in the circulating hot air. The air outlet of the condenser is connected to the air inlet of the second-stage electric heating device. The compressor, condenser, expansion valve, and evaporator form a closed loop. The controller controls the heating power of the first-stage heat pump heating device by adjusting the operating frequency of the compressor.

3. The high-efficiency circulating hot air drying device for cable production according to claim 1, characterized in that, The second-stage electric heating device includes a heating shell and multiple electric heating tubes disposed within the heating shell. The controller adjusts the heating power of the second-stage electric heating device by controlling the output current of the electric heating tubes.

4. The high-efficiency circulating hot air drying device for cable production according to claim 1, characterized in that, The inner wall of the drying chamber is provided with a high-temperature resistant reflective layer, which is made of stainless steel mirror material and is used to reflect the heat of hot air and reduce heat loss of the drying chamber.

5. The high-efficiency circulating hot air drying device for cable production according to claim 1, characterized in that, The circulating air duct is also equipped with an air filtration assembly, which includes a primary filter and a high-efficiency filter. The primary filter is located near the air outlet of the drying chamber, and the high-efficiency filter is located near the air inlet of the first-stage heat pump heating device. It is used to filter dust and impurities in the circulating hot air.

6. The high-efficiency circulating hot air drying device for cable production according to claim 2, characterized in that, The formula for the adjustment algorithm used to control the heating power of the first-stage heat pump heating device is as follows: ； In the formula, The target heating power of the heat pump heating device, , , These are the proportional coefficient, integral coefficient, and derivative coefficient of the heat pump control loop, respectively. The target temperature for the drying chamber. The actual temperature detected by the temperature sensor. To control the cycle.

7. The high-efficiency circulating hot air drying device for cable production according to claim 3, characterized in that, The formula for the adjustment algorithm used to control the heating power of the second-stage electric heating device is as follows: ； In the formula, The target heating power of the electric heating device. This is the proportional coefficient for the electric heating control circuit. The actual heating efficiency of the first-stage heat pump heating device is given by the calculated result. At that time, the controller stops the second-stage electric heating device from operating.

8. The high-efficiency circulating hot air drying device for cable production according to claim 1, characterized in that, When the controller calculates the heating power of the first-stage heat pump heating device and the heating power of the second-stage electric heating device according to the adjustment algorithm, it simultaneously calculates and adjusts the speed of the circulating fan. The speed adjustment formula is as follows: ； In the formula, The target speed of the circulating fan. This is the reference speed of the circulating fan. To ensure the total heating power matches the hot air circulation volume, thereby improving heat exchange efficiency.

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