Traditional Chinese medicine material circulating drying equipment

Abstract

The application provides a traditional Chinese medicine circulating drying equipment, which comprises an oven main body for containing traditional Chinese medicine, a material guiding assembly arranged on one side of the oven main body and used for circulating and conducting the traditional Chinese medicine, an air blowing assembly arranged on the top of the oven main body and communicated with the oven main body, a circulating pipe arranged on the side of the oven main body away from the material guiding assembly, wherein the air blowing assembly comprises an air blowing box at least partially embedded on the top of the oven main body, a second motor at least partially embedded on the top of the air blowing box, a wind wheel group connected with the output end of the second motor, a movable frame movably arranged on the bottom of the air blowing box, a dredging part fixedly arranged on the bottom end of the air blowing box, an air outlet arranged on the top of the air blowing box and used for communicating with the circulating pipe, and air guiding holes arranged on the dredging part and the movable frame, wherein the air guiding holes on the movable frame are used for filtering air, and the movable frame is guided to move towards the dredging part by the wind wheel group after dust is attached to the surface of the movable frame and generates resistance, and the dredging part is embedded into the air guiding holes on the movable frame to complete dredging.

Description

Technical Field

[0001] This invention relates to the field of Chinese medicinal material drying technology, and in particular to a circulating drying device for Chinese medicinal materials. Background Technology

[0002] Traditional Chinese medicinal materials refer to drugs that are collected, processed, and prepared according to the principles of traditional Chinese medicine, with their mechanisms of action explained, and used to guide clinical applications. They mainly originate from natural medicines and their processed products, including but not limited to plants, animals, minerals, as well as some specially processed chemical drugs and biological products.

[0003] The production and processing of Chinese medicinal herbs is a complex and meticulous process aimed at improving the efficacy and utilization rate of the herbs, and ensuring the quality and safety of the final product. The production and processing of Chinese medicinal herbs includes raw material preparation and harvesting, processing and preparation, preparation, packaging and storage. Among these, processing and preparation is the core step in the production and processing of Chinese medicinal herbs, which includes cleaning, drying, stir-frying, grinding, soaking and processing. In order to ensure the subsequent preservation effect of Chinese medicinal herbs and avoid incomplete drying that could lead to dampness and mold, special attention needs to be paid to the drying step.

[0004] Existing drying devices for Chinese medicinal herbs commonly include drying ovens and stir-frying dryers. Among them, drying ovens are the most common drying equipment. To ensure drying efficiency and energy saving within the oven environment, a circulation pipe is designed to circulate the hot air inside the oven, preventing heat loss and ensuring drying efficiency. However, during the air circulation process, a lot of fine particles such as dust will be generated on the surface of the Chinese medicinal herbs. Over a long period of time, the dust and particles generated will adhere to the circulation pipe opening and cannot be processed, resulting in a decrease in the air circulation rate inside the drying oven and inefficient drying of moisture. This reduces drying efficiency and also causes a decline in the quality of the dried Chinese medicinal herbs. Summary of the Invention

[0005] Based on this, the purpose of this invention is to provide a circulating drying device for Chinese medicinal materials, which aims to solve the problem that in the existing drying devices for Chinese medicinal materials, dust and particulate matter generated by the Chinese medicinal materials during the circulating air process will adhere to the circulation pipe and cannot be processed, resulting in a decrease in drying efficiency and a decline in the drying quality of Chinese medicinal materials.

[0006] The present invention proposes a circulating drying device for Chinese medicinal materials, comprising a drying oven body for containing Chinese medicinal materials, a material guiding assembly disposed on one side of the drying oven body for circulating and transferring Chinese medicinal materials, a blower assembly disposed on the top of the drying oven body and connected thereto, and a circulating conduit disposed on the side of the drying oven body away from the material guiding assembly and connected to the blower assembly and the drying oven body respectively. The material guiding assembly includes a material guiding box that is connected to the top and bottom of the oven body respectively, a first motor that is fixedly installed at the bottom of the material guiding box, and a feeding paddle connected to the output end of the first motor. The feeding paddle carries the Chinese medicinal materials located at the bottom of the oven body to the top for circulation. The blower assembly includes a blower box at least partially embedded in the top of the oven body, a second motor at least partially embedded in the top of the blower box, a fan assembly connected to the output end of the second motor, a movable frame movably disposed at the bottom of the blower box, a dredging section fixedly disposed at the bottom of the blower box, and an air outlet opened on the top of the blower box for connecting to the circulation duct. Both the dredging section and the movable frame are provided with air guide holes so that the air generated by the fan assembly can pass through the dredging section and the movable frame and be introduced into the air outlet. The air guide holes on the movable frame are used to filter the air. After dust adheres to the surface of the movable frame, it generates resistance, so that the fan assembly draws and guides the movable frame to move closer to the dredging section, and the dredging is completed by the dredging section embedding into the air guide holes on the movable frame.

[0007] As described above, the conveying components and material guiding assembly enable the cyclical transfer of Chinese medicinal herbs. During this cyclical transfer, collisions can occur, causing dust, particles, and partially broken herb residues to accumulate inside the oven. Under the continuous output of the impeller assembly, these residues are gradually drawn upwards to the movable frame and accumulate at the bottom of the telescopic frame, causing blockage of the air vents at the bottom of the telescopic frame. When the blockage reaches a certain threshold, the impeller assembly, continuously generating suction, will directly pull the movable frame upwards, causing it to move closer to the unblocking section. The process involves inserting the air guide into the air duct from the side away from the blockage of the telescopic movable frame, pushing out the blockage. After unblocking, the movable frame, due to reduced suction resistance from the impeller assembly, extends away from the unblocking section, thus restoring the airflow. This reduces the frequency of regular cleaning by operators, indirectly increasing the usage time of the circulating drying equipment for Chinese medicinal herbs, improving production efficiency. It also solves the problem in existing drying devices where dust and particulate matter generated by the herbs during the circulating air process adheres to the circulation pipe opening and cannot be processed, leading to decreased drying efficiency and quality.

[0008] Furthermore, the movable frame includes an elastic part embedded in the bottom edge of the blower box, and a telescopic frame at least partially movably embedded in the bottom of the blower box, with the air guide hole opened on the side of the telescopic frame away from the elastic part.

[0009] Furthermore, the oven body includes a feeding hopper extending outward from the top, a feeding guide located inside the oven body and near the top of the feeding guide assembly, a conveying assembly located inside the oven body, a single-way valve movably located inside the oven body and near the bottom of the feeding guide assembly, a discharge assembly located away from the single-way valve, and an air inlet groove embedded at the bottom end of the oven body. At least four bases extend outward from the bottom edge of the oven body.

[0010] Furthermore, the conveying assembly includes at least three unidirectional conveyor belts disposed within the oven body, and a bidirectional conveyor belt disposed at the bottom of the unidirectional conveyor belts, with the single-way valve disposed near the side of the bidirectional conveyor belt.

[0011] Furthermore, the unidirectional conveyor belts are arranged in an alternating pattern from top to bottom, and the unidirectional conveyor belt at the top is used to receive the Chinese medicinal materials exported along the guide section.

[0012] Furthermore, the discharge assembly includes a discharge port extending outward along one side of the bottom of the oven body, and a solenoid valve embedded at the bottom of the discharge port. The discharge port is used to receive Chinese medicinal materials discharged along the bidirectional conveyor belt away from the single-way valve.

[0013] Furthermore, the circulation conduit includes a main conduit with both ends for connecting the air outlet and the material outlet, at least three branch conduits extending along the main conduit toward the oven body, and a filter layer embedded in the branch conduits.

[0014] Furthermore, at least two heating elements are embedded in the inner wall of the oven body near the circulation conduit, and the heating elements are distributed between adjacent diversion conduits. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the circulating drying equipment for Chinese medicinal materials in an embodiment of the present invention; Figure 2 This is a schematic cross-sectional view of the circulating drying equipment for Chinese medicinal materials in an embodiment of the present invention; Figure 3 This is a partial cross-sectional structural diagram of the main body of the drying oven in the circulating drying equipment for Chinese medicinal materials according to an embodiment of the present invention; Figure 4 This is a partial cross-sectional structural diagram of the material guiding assembly in the circulating drying equipment for Chinese medicinal materials according to an embodiment of the present invention; Figure 5 This is a partial cross-sectional structural diagram of the blower assembly in the circulating drying equipment for Chinese medicinal materials according to an embodiment of the present invention; Figure 6This is a partial cross-sectional schematic diagram of the circulating conduit in the circulating drying equipment for Chinese medicinal materials according to an embodiment of the present invention; Figure 7 This is a partial structural diagram of the cylindrical cover in the circulating drying equipment for Chinese medicinal materials according to an embodiment of the present invention.

[0016] Explanation of key component symbols:

[0017] The following detailed description of the embodiments will further illustrate the present invention in conjunction with the above-described accompanying drawings. Detailed Implementation

[0018] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0019] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] Please see Figures 1 to 7The image shows a circulating drying device for Chinese medicinal materials according to an embodiment of the present invention. It includes a drying oven body 1 for containing the Chinese medicinal materials, a material guide assembly 2 disposed on one side of the drying oven body 1 for circulating the Chinese medicinal materials, a blower assembly 3 disposed on and connected to the top of the drying oven body 1, and a circulation conduit 4 disposed on the side of the drying oven body 1 away from the material guide assembly 2 and connected to both the blower assembly 3 and the drying oven body 1. The material guide assembly 2 includes a material guide box 21 connected to the top and bottom of the drying oven body 1, a first motor 22 fixedly disposed at the bottom of the material guide box 21, and a feeding paddle 23 connected to the output end of the first motor 22. The feeding paddle 23 has a spiral design, and the Chinese medicinal materials located at the bottom of the drying oven body 1 are transported to the top for circulating circulation via the feeding paddle 23. The blower assembly 3 includes at least a portion of... The oven body 1 includes a blower box 31 embedded in the top, a second motor 32 at least partially embedded in the top of the blower box 31, a fan assembly 33 connected to the output end of the second motor 32, a movable frame movably disposed at the bottom of the blower box 31, a dredging section 37 fixedly disposed at the bottom of the blower box 31, and an air outlet 38 opened at the top of the blower box 31 for connecting the circulation duct 4. Both the dredging section 37 and the movable frame are provided with air guide holes so that the air generated by the fan assembly 33 can pass through the dredging section 37 and the movable frame and be introduced into the air outlet 38. The air guide holes on the movable frame are used to filter the air. After dust adheres to the surface of the movable frame, it generates resistance so that the fan assembly 33 draws and guides the movable frame to move closer to the dredging section 37, and the dredging is completed by the dredging section 37 being embedded in the air guide holes on the movable frame.

[0022] Furthermore, the movable frame includes an elastic part 34 embedded in the bottom edge of the blower box 31, and a telescopic frame 35 at least partially movably embedded in the bottom of the blower box 31, wherein the telescopic frame 35 contacts the elastic part 34, and the air guide hole is opened on the side of the telescopic frame 35 away from the elastic part 34. The oven body 1 includes a feeding hopper 11 extending outward from the top, a feeding guide part 12 disposed inside the oven body 1 and near the top of the feeding guide assembly 2, a conveying assembly disposed inside the oven body 1, and a movably disposed inside the oven body 1 and near the top of the feeding guide assembly 2. The material guide assembly 2 has a single-way valve 15 on one side of its bottom and a discharge assembly on the side away from the single-way valve 15. In some optional embodiments, the single-way valve 15 consists of a spring shaft for connecting the oven body 1 and a movable plate extending along the spring column toward the side near the bidirectional conveyor belt 14, as well as an air inlet groove 18 embedded at the bottom end of the oven body 1. At least four bases 5 extend outward from the bottom edge of the oven body 1. The conveying assembly includes at least three unidirectional conveyor belts 13 disposed within the oven body 1, and a material discharge assembly disposed on the unidirectional conveyor belts. The bottom of the unidirectional conveyor belt 13 has a bidirectional conveyor belt 14, with a single-way valve 15 located near the side of the bidirectional conveyor belt 14. The unidirectional conveyor belts 13 are arranged in a staggered pattern from top to bottom, and the top unidirectional conveyor belt 13 is used to receive the Chinese medicinal materials discharged along the guide section 12. The discharge assembly includes a discharge port 16 extending outward from one side of the bottom of the oven body 1, and a solenoid valve 17 embedded at the bottom of the discharge port 16. The discharge port 16 is used to receive the Chinese medicinal materials discharged along the side of the bidirectional conveyor belt 14 away from the single-way valve 15. It should be noted that the conveyor belt... Each conveyor belt in the conveyor assembly is equipped with an output motor, and the output motor on the bidirectional conveyor belt 14 is a bidirectional output servo motor. The circulation conduit 4 includes a main conduit 41 with both ends for connecting the air outlet 38 and the material outlet 16 respectively, at least three branch conduits 42 extending along the main conduit 41 toward the oven body 1, and a filter layer 43 embedded in the branch conduits 42. At least two heating parts 44 are embedded in the inner wall of the oven body 1 near the circulation conduit 4, and the heating parts 44 are distributed between adjacent branch conduits 42.

[0023] It should be noted that in some optional embodiments of the present invention, a controller is also provided at any convenient position for the operator to operate the circulating drying equipment for Chinese medicinal materials. The controller can be an MCU (Microcontroller Unit) chip to realize the overall control of the circulating drying equipment for Chinese medicinal materials through the MCU chip. The controller and the circulating drying equipment for Chinese medicinal materials are electrically connected, and the electrical connection includes wired connection and wireless connection. The wireless connection method includes, but is not limited to, Bluetooth connection, WiFi, IF radio frequency, and Zigbee. The wired connection method includes, but is not limited to, a USB line that connects the circulating drying equipment for Chinese medicinal materials to the controller.

[0024] In practice, the operator first lowers the required quantity of Chinese medicinal herbs into the hopper 11 and closes the top cover. The herbs fall to the guide section 12 and slide along its inclined path to the top unidirectional conveyor belt 13. Then, the operator can sequentially activate the unidirectional conveyor belt 13, bidirectional conveyor belt 14, heating section 44, blower assembly 3, and guide assembly 2 via the controller. Initially, the bidirectional conveyor belt 14 is set to conduct the drying process towards the guide assembly 2, performing a cyclical drying operation. Specifically, the unidirectional conveyor belt 13 performs a top-to-bottom staggered transfer of the herbs. During the process, as the herbs fall from one unidirectional conveyor belt 13 to the next, and finally to the bidirectional conveyor belt 14, they undergo a three-stage turning process to disperse them and ensure initial spreading, thus guaranteeing the subsequent drying of the herbs. The herbs are brought into full contact with the ambient hot air to improve the drying effect. Then, the herbs enter the bottom of the guide box 21 through the single-way valve 15, and the feeding paddle 23 driven by the first motor 22 spirals and conveys the herbs until they reach the guide section 12 and then recirculate into the surface of the uppermost one-way conveyor belt 13. During this spiral upward conveying process, the herbs can be further spread out so that they can be successively discharged to the guide section 12. In addition, in some optional embodiments of the present invention, in order to avoid the herbs being damaged to a large extent during the conveying process, the feeding paddle 23 can be made entirely of rubber. Since rubber itself is soft and has a good anti-slip effect, it not only reduces the damage to the herbs during the conveying process, but also kneads the herbs to better remove the moisture from them. Kneading herbs is also a common pre-drying treatment method in the industry.

[0025] Furthermore, while the unidirectional conveyor belt 13, bidirectional conveyor belt 14, and material guide assembly 2 are conveying the Chinese medicinal materials, the second motor 32 on the blower assembly 3 drives the impeller assembly 33 at its output end to circulate air within the oven body 1. Specifically, the airflow generated by the impeller assembly 33 during the driving process draws the air heated by the heating unit 44 within the oven body 1 into the circulation duct 4 for diversion. First, the air enters the main pipe 41, and then the main pipe 41 guides the hot air through the diversion duct 42 back into the oven body 1. Simultaneously, during the outflow process, the introduced air can be reheated by the heating unit 44 located between adjacent diversion ducts 42 to achieve heat dissipation of the oven body. The internal air heat circulation effect is achieved by the arrangement of the diversion duct 42, which corresponds to the surface of the three unidirectional conveyor belts 13, so as to achieve the effect of fully drying the Chinese medicinal materials on the surface, further improving the drying efficiency and ensuring the drying quality. In addition, in some optional embodiments, a filter layer can be set at the air inlet 18 to reduce the entry of external impurities, or an external exhaust fan can be added at the air inlet 18. This can be understood as a design to exhaust the air inside the oven body 1 to the outside. In addition, a humidity sensor can be added inside the oven body 1 in conjunction with the external exhaust fan. The purpose is to provide real-time feedback on the humidity inside the oven body 1 through the humidity sensor and adaptively wake up the external exhaust fan to perform dehumidification operation inside the oven body 1, so as to further improve the drying effect.

[0026] Furthermore, when the Chinese medicinal herbs are in a semi-dry state, that is, after the surface has set and hardened, during the circulation process, bumps and knocks may occur, causing dust, particles, and some broken medicinal herb residues to accumulate inside the oven body 1. Under the continuous output of the impeller assembly 33, the remaining dust, particles, and medicinal herb residues will be drawn upwards to the movable frame and continuously accumulate at the bottom of the telescopic frame 35 on the movable frame, causing blockage of the air vents at the bottom of the telescopic frame 35. In response, when the blockage at the bottom of the telescopic frame 35 reaches a certain threshold, the impeller assembly 33, which continuously generates suction force, will directly draw the air vents from the telescopic frame 35. The retractable frame 35 is pulled upwards, causing it to move towards the unblocking section 37 until the unblocking section 37 penetrates the air guide hole on the side away from the blockage of the retractable frame 35, pushing out the blockage in the air guide hole. After unblocking, the retractable frame 35 is subjected to reduced suction resistance from the impeller assembly 33, and is simultaneously assisted by the deformation of the elastic section 34, causing the retractable frame 35 to extend away from the unblocking section 37 again, thus achieving the effect of re-unblocking. This operation can automatically unblock the blockage area of ​​the retractable frame 35, reducing the frequency of regular cleaning by operators, thereby indirectly increasing the service life of the Chinese herbal medicine circulating drying equipment and improving production efficiency.

[0027] In addition, in some optional embodiments of the present invention, a cylindrical cover can be added to the bottom edge of the telescopic frame 35, such as... Figure 7As shown, it is detachably connected to the bottom of the telescopic frame 35. The purpose is to isolate some dust, particles and important residues from the outside while not affecting the normal air circulation at the bottom of the telescopic frame 35. It can also hold some larger particles of residue discharged during the unblocking process of the unblocking section 37 so that the operators can collect them in a unified manner later.

[0028] In summary, the conveying components and the material guide assembly 2 enable the cyclical transfer of Chinese medicinal herbs. During this cyclical transfer, collisions can occur, causing dust, particles, and partially broken herb residues to accumulate inside the oven body 1. Under the continuous output of the impeller assembly 33, these residual dust, particles, and herb residues are gradually drawn upwards to the movable frame and accumulate at the bottom of the telescopic frame 35, causing blockage of the air vents at the bottom of the telescopic frame 35. When the blockage at the bottom of the telescopic frame 35 reaches a certain threshold, the impeller assembly 33, which continuously generates suction, will directly pull the movable frame upwards, causing it to move closer to the unblocking section. The device moves in direction 37 until the unblocking part 37 extends into the air guide hole on the side away from the blockage surface of the telescopic movable frame, pushing out the blockage in the air guide hole. After unblocking, the movable frame itself experiences reduced suction resistance from the impeller assembly 33, causing the movable frame to extend again in the direction away from the unblocking part 37, thus achieving the effect of re-opening the air guide. This reduces the frequency of regular cleaning by operators, indirectly increasing the service life of the Chinese herbal medicine circulating drying equipment, improving production efficiency, and solving the problem that in existing Chinese herbal medicine drying devices, dust and particulate matter generated by Chinese herbal medicines during the circulating air process adhere to the circulation pipe and cannot be processed, resulting in both low drying efficiency and a decline in the drying quality of Chinese herbal medicines.

[0029] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A circulating drying device for traditional Chinese medicinal materials, characterized in that: It includes an oven body for containing Chinese medicinal materials, a material guide assembly disposed on one side of the oven body for circulating and transferring the Chinese medicinal materials, a blower assembly disposed on the top of the oven body and connected thereto, and a circulation conduit disposed on the side of the oven body away from the material guide assembly and connected to the blower assembly and the oven body respectively. The material guiding assembly includes a material guiding box that is connected to the top and bottom of the oven body respectively, a first motor that is fixedly installed at the bottom of the material guiding box, and a feeding paddle connected to the output end of the first motor. The feeding paddle carries the Chinese medicinal materials located at the bottom of the oven body to the top for circulation. The blower assembly includes a blower box at least partially embedded in the top of the oven body, a second motor at least partially embedded in the top of the blower box, a fan assembly connected to the output end of the second motor, a movable frame movably disposed at the bottom of the blower box, a dredging section fixedly disposed at the bottom of the blower box, and an air outlet opened on the top of the blower box for connecting the circulation duct. Both the dredging section and the movable frame are provided with air guide holes so that the air generated by the fan assembly can pass through the dredging section and the movable frame and be introduced into the air outlet. The air guide holes on the movable frame are used to filter the air. After dust adheres to the surface of the movable frame, it generates resistance, so that the fan assembly draws and guides the movable frame to move closer to the dredging section, and the dredging is completed by the dredging section embedding into the air guide holes on the movable frame. The movable frame includes an elastic part embedded in the bottom edge of the blower box, and a telescopic frame that is at least partially movably embedded in the bottom of the blower box, with the air guide hole opened on the side of the telescopic frame away from the elastic part; The oven body includes a feeding hopper extending outward from the top, a feeding guide located inside the oven body and near the top of the feeding guide assembly, a conveying assembly located inside the oven body, a single-way valve movably located inside the oven body and near the bottom of the feeding guide assembly, a discharge assembly located away from the single-way valve, and an air inlet groove embedded at the bottom of the oven body. At least four bases extend outward from the bottom edge of the oven body. The conveying assembly includes at least three unidirectional conveyor belts disposed within the oven body, and a bidirectional conveyor belt disposed at the bottom of the unidirectional conveyor belts, with the one-way valve disposed near the side of the bidirectional conveyor belt; The unidirectional conveyor belts are arranged in an alternating pattern from top to bottom, and the unidirectional conveyor belt at the top is used to receive the Chinese medicinal materials exported along the guide section.

2. The circulating drying equipment for Chinese medicinal materials according to claim 1, characterized in that: The discharge assembly includes a discharge port extending outward from one side of the bottom of the oven body, and a solenoid valve embedded at the bottom of the discharge port. The discharge port is used to receive Chinese medicinal materials discharged along the bidirectional conveyor belt away from the single-way valve.

3. The circulating drying equipment for Chinese medicinal materials according to claim 2, characterized in that: The circulation conduit includes a main conduit with both ends for connecting the air outlet and the material outlet, at least three branch conduits extending along the main conduit toward one side of the oven body, and a filter layer embedded in the branch conduits.

4. The circulating drying equipment for Chinese medicinal materials according to claim 3, characterized in that: At least two heating elements are embedded in the inner wall of the oven body near the circulation conduit, and the heating elements are distributed between adjacent diversion conduits.

Images