Drying equipment

Abstract

Drying equipment comprises a drying oven and a heat pump main machine, the drying oven comprises an oven body and a partition plate arranged in the oven body, the partition plate divides the space in the oven body into a circulating air path, a movable fan device is arranged at the position, at one end of the partition plate, of the path of the circulating air path, and forward and reverse airflow is formed on the circulating air path through left-right movement of the movable fan device. According to the principle, the moving fan device periodically moves left and right, the leading direction of airflow in the circulating air path can be dynamically changed, hot air is alternately blown in from the two sides of a material stack, single-side overheating or ventilation dead angles caused by the fixed air direction are effectively avoided, and drying uniformity and efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of drying technology, specifically to a drying device that uses heat pump technology and can achieve periodic switching of airflow direction. Background Technology

[0002] Heat pump drying equipment is widely used in many fields such as agricultural products, food, and industrial products due to its high efficiency and energy saving. Traditional heat pump drying equipment usually includes a drying oven and a heat pump unit. The drying oven is equipped with a fixed fan and air duct to guide the hot air to circulate through the material to be dried.

[0003] However, this type of fixed air duct design has obvious drawbacks: inside the drying oven, the airflow path is relatively fixed, which can easily lead to uneven heating and ventilation of materials in different locations. Materials near the air inlet dry too quickly, while materials far from the air inlet dry slowly. This not only affects the overall drying efficiency, but may also lead to inconsistent drying quality of materials, and even problems such as localized over-drying or wet core.

[0004] Therefore, improving the uniformity of airflow distribution inside the drying oven is a technical problem that urgently needs to be solved to achieve high-quality and high-efficiency drying. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the defect of uneven airflow distribution in existing drying equipment and to provide a device that can make the airflow direction in the drying oven change periodically, thereby achieving uniform drying.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a drying device, including a drying oven and a heat pump main unit. The drying oven includes a box body and a partition disposed inside the box body. The partition divides the space inside the box body into a circulating air path. A movable fan device is provided at one end of the partition along the path of the circulating air path. The left and right movement of the movable fan device creates positive and negative airflows in the circulating air path. The principle of this utility model: the periodic left and right movement of the movable fan device can dynamically change the dominant direction of the airflow in the circulating air path, allowing hot air to be alternately blown in from both sides of the material stack, effectively avoiding one-sided overheating or ventilation dead zones caused by a fixed airflow direction, and significantly improving the uniformity and efficiency of drying.

[0007] As an improvement, the circulating air path is in a U-shape.

[0008] As an improvement, the heat pump unit is located inside the oven and on one side of the mobile fan unit.

[0009] As an improvement, the circulating air path includes drying zones located on both sides of the partition and turning and recirculating zones located at both ends of the partition. The mobile fan device is located in the turning and recirculating zone at one end, and the mobile fan device switches between the two drying zones by moving left and right.

[0010] As an improvement, the mobile fan device comprises a track, a mobile frame walking on the track, several fans arranged on the mobile frame, and a driving mechanism driving the mobile frame.

[0011] As an improvement, the driving mechanism comprises a rotating shaft mounted on the mobile frame, driving rollers arranged at both ends of the rotating shaft, and a motor driving the rotating shaft to rotate, the driving rollers walking on the track.

[0012] As an improvement, one side of the mobile frame is provided with a sealing plate, and an air outlet is arranged on the sealing plate corresponding to the fan.

[0013] As an improvement, travel switches are arranged on both sides of the mobile frame, the travel switches are associated with the motor, and trigger the motor to stop or reverse.

[0014] The utility model compared with prior art brings beneficial effect is:

[0015] Through the reciprocating motion of the mobile fan device, the airflow direction in the forced circulation air path is periodically reversed, so that the materials in the oven can alternately be in the strong wind area and the backflow area, the heating and dehydration are extremely uniform, and the dead angle problem existing in the traditional drying equipment is effectively solved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model layout drawing.

[0017] Figure 2 The utility model is a mobile fan device schematic view. DETAILED DESCRIPTION

[0018] The utility model will be further described below in conjunction with the drawings of the specification.

[0019] A kind of drying equipment, mainly including oven and heat pump host 4.

[0020] As Figure 1 The oven includes a sealed box body 1, and a vertical partition 2 is fixedly installed inside the box body 1. The partition 2 divides the interior space of the box body 1 into a continuous, substantially back-shaped circulating air path. Specifically, the circulating air path includes two drying zones 11 on both sides of the partition 2, which are first drying zone and second drying zone respectively, and two turning backflow zones 12 at both ends of the partition. Two drying zones 11 are used for placing material stacks, and are the main areas for heat exchange. The air after heat exchange flows from one side drying zone to the other side drying zone through one end turning backflow zone, realizing air circulation,

[0021] As Figure 1 , 2As shown, a mobile fan device 3 is installed in a turning and recirculation zone 12. This device includes two parallel tracks 31 fixedly mounted on the housing 1, a mobile frame 32 that can move horizontally left and right on the tracks 31, multiple fans 33 mounted on the mobile frame 32, and a drive mechanism 34 that drives the mobile frame 32. The drive mechanism 34 includes a rotating shaft mounted on the mobile frame 32 via bearing seats, with drive rollers mounted at both ends of the shaft, the drive rollers resting on the tracks. A motor drives the rotating shaft to rotate via gear meshing, thereby driving the drive rollers to roll along the tracks 31, achieving precise left and right movement of the mobile frame 32. Limit switches are provided on both sides of the mobile frame 32, and these limit switches are associated with the motor, triggering the motor to stop or reverse. A sealing plate 35 is installed on the side of the mobile frame 32 facing the drying zone 11, with air outlets corresponding to the positions of each fan 33 on the sealing plate 35; the edge of the sealing plate 35 is close to the inner wall of the housing, its function being to concentrate and directionally blow the air generated by the fans 33 out through the air outlets.

[0022] The heat pump unit 4 is installed inside the oven, preferably at the same end as the mobile fan unit 3. Part of the circulating air is returned to the heat pump unit for dehumidification and heating. The core components of the heat pump unit include a compressor, an evaporator, and a condenser. The evaporator is located in the section after the airflow passes through the material and absorbs moisture and cools down, and is used to absorb the residual heat of the humid air and condense it for dehumidification. The condenser is located in the section before the airflow is blown towards the material by the fan, and is used to heat the air.

[0023] The working principle and airflow circulation process of this utility model are as follows:

[0024] Initial or first stage: The control system commands the drive mechanism 34 to move the mobile fan device 3 to the left side of the circulating air path; at this time, all fans 33 start, and air is forcefully blown out from the air outlet on the left; driven by the airflow, the hot air generated by the heat pump host enters the first drying zone, blows over the material pile on the left, and heats and dehydrates it; then the airflow turns at the bottom turning and recirculation zone 12 and enters the second drying zone, flowing in reverse at a relatively weak speed over the material pile on the right; then, the airflow turns again at the upper turning and recirculation zone 12, and part of the airflow flows through the evaporator of the heat pump host for cooling and dehumidification, then flows through the condenser for reheating, and finally is drawn in by the air inlet side of the fan 33, completing a complete positive cycle.

[0025] Second stage after reversal: After running for a period of time, the control system commands the motor to reverse and drive the mobile fan device 3 to move along the track 31 to the right position; at this time, the air outlet of the fan 33 is aligned with the second drying zone; the airflow direction is completely reversed: hot air is first blown into the second drying zone, and strong wind acts on the material stack on the right; then after turning at the bottom, it enters the first drying zone and flows in the opposite direction through the material stack on the left with a weaker wind speed; finally, it returns to the end of the mobile fan device, completing a reverse cycle.

[0026] In this way, the mobile fan device 3 reciprocates at one end of the loop-shaped circulating air path, periodically switching the dominant direction of air flow in the drying area. This allows both sides of the material pile to regularly receive strong wind directly and weak wind backflow, and the temperature, humidity, and wind speed field at each point in the oven dynamically change, achieving unprecedented uniform drying effect with high energy efficiency ratio.

Claims

1. A drying apparatus comprising an oven and a heat pump host, characterized by: The oven includes a box body and a partition plate arranged inside the box body. The partition plate divides the space inside the box body into a circulating air path. At one end of the partition plate on the path of the circulating air path, a mobile fan device is provided. The left and right movement of the mobile fan device forms positive and negative airflows on the circulating air path.

2. A drying apparatus as claimed in claim 1, wherein: The circulating air path is in a figure-eight shape.

3. A drying apparatus as claimed in claim 1, wherein: The heat pump main unit is arranged inside the oven and is located on one side of the mobile fan device.

4. A drying apparatus as claimed in claim 1, wherein: The circulating air path includes drying areas on both sides of the partition plate and turning and reflux areas at both ends of the partition plate. The mobile fan device is arranged in the turning and reflux area at one end, and the mobile fan device switches between the two drying areas by moving left and right.

5. A drying apparatus as claimed in claim 1, wherein: The mobile fan device includes a track, a mobile rack walking on the track, several fans arranged on the mobile rack, and a driving mechanism for driving the mobile rack.

6. A drying apparatus as claimed in claim 5, wherein: The driving mechanism includes a rotating shaft installed on the mobile rack, driving rollers arranged at both ends of the rotating shaft, and a motor for driving the rotation of the rotating shaft. The driving rollers walk on the track.

7. A drying apparatus as claimed in claim 5, wherein: A sealing plate is arranged on one side of the mobile rack, and air outlets corresponding to the fans are arranged on the sealing plate.

8. A drying apparatus as claimed in claim 6, wherein: Travel switches are arranged on both sides of the mobile rack. The travel switches are associated with the motor to trigger the motor to stop or reverse.

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