Continuous vacuum microwave negative pressure drying equipment
By introducing a buffer component and a real-time air pressure monitoring and control system into the vacuum microwave drying equipment, the problems of frequent vacuum breaking and vacuum pumping in traditional equipment are solved, enabling continuous drying of materials and improving drying efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHAANXI DALI SHAYUAN CHRYSANTHEMUM CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-16
Smart Images
Figure CN224365262U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of agricultural product processing technology, specifically a continuous vacuum microwave negative pressure drying device. Background Technology
[0002] Vacuum microwave drying equipment is commonly used in agricultural product processing to dry agricultural products.
[0003] Traditional vacuum microwave drying equipment requires the product to be placed in a vacuum chamber, the chamber door to be closed and a vacuum to be drawn before microwave drying, and finally the vacuum to be broken and the product removed. This results in repeated vacuuming and breaking operations for each drying operation, and the vacuuming process takes a lot of time, thus increasing the drying time of the product.
[0004] Therefore, this application provides a continuous vacuum microwave negative pressure drying device to solve the above problems. Utility Model Content
[0005] This application provides a continuous vacuum microwave negative pressure drying device, which aims to solve the problems mentioned in the background art. Existing vacuum microwave drying devices require the product to be placed in a vacuum chamber, the chamber door to be closed and a vacuum to be drawn, microwave drying to be performed, and finally the vacuum to be broken and the product to be taken out. This results in repeated vacuum breaking and drawing operations for each product drying operation, and the vacuum drawing takes a lot of time, which increases the drying time of the product.
[0006] To achieve the above objectives, this application provides the following technical solution: a continuous vacuum microwave negative pressure drying device, comprising a microwave drying chamber and a first vacuum pump disposed outside the microwave drying chamber for evacuating the interior of the microwave drying chamber;
[0007] To ensure continuous material drying: Buffer components symmetrically arranged at both ends of the microwave drying chamber for material drying buffering; a connecting pipe extending through the end of the microwave drying chamber for connection to the buffer components; a conveyor belt device for material transport running through the microwave drying chamber and the first vacuum pump; a second vacuum pump located outside the buffer components for evacuating the buffer components; a first pressure sensor interspersed in the wall of the microwave drying chamber for monitoring the internal air pressure; a second pressure sensor interspersed in the wall of the buffer components for monitoring the internal air pressure of the buffer components; and a controller located on the outer wall of the microwave drying chamber for controlling the first vacuum pump, the buffer components, and the second vacuum pump. The air pressure inside the microwave drying chamber and the buffer chamber is monitored in real time by the first pressure sensor and the second pressure sensor, respectively. Then, the controller activates the first hydraulic rod to open the outer gate, placing the material on top of the conveyor belt. The first hydraulic rod is then controlled to push the outer gate into contact with the buffer chamber, closing it. Once the pressure difference between the buffer chamber and the microwave drying chamber is within a set range, the second hydraulic rod is controlled to move the inner gate vertically, allowing the material to pass through the conveyor belt for drying. Afterward, the inner gate is opened sequentially through the buffer assembly at the other end of the microwave drying chamber, moving the material into the buffer chamber. Finally, the outer gate is opened to remove the dried material. This eliminates the need for frequent vacuum breaking and evacuation operations inside the microwave drying chamber, reducing waiting time and enabling continuous drying of the material.
[0008] Preferably, for material transfer: the microwave drying chamber has symmetrically provided first and second openings at both ends for the conveyor belt to pass through; symmetrically provided on both sides of the conveyor belt are sealing components for sealing between the conveyor belt and the microwave drying chamber and the buffer assembly; the walls of the microwave drying chamber and the buffer assembly are respectively provided with circular holes for installing the sealing components. By providing the conveyor belt through the two buffer assemblies and the microwave drying chamber, the material is sequentially transferred between one of the buffer assemblies, the microwave drying chamber, and the other buffer assembly.
[0009] Preferably, to maintain the vacuum effect between the microwave drying chamber and the buffer chamber: the sealing assembly includes a sealing sleeve and a sealing ring fitted on the outer wall of the sealing sleeve for sealing between the sealing sleeve and the circular hole. The sealing sleeve and sealing ring ensure the normal operation of the track conveyor while maintaining the vacuum in both the microwave drying chamber and the buffer chamber.
[0010] Preferably, for feeding the buffer chamber: the buffer assembly includes a buffer chamber disposed at the end of the connecting pipe away from the microwave drying chamber, an outer gate disposed at the end of the buffer chamber away from the connecting pipe for closing the buffer chamber, and an inner gate disposed at the end of the buffer chamber near the connecting pipe for closing the first opening. The buffer chamber is opened or closed by moving the inner gate and the outer gate.
[0011] Preferably, to facilitate monitoring of the internal air pressure of the buffer chamber, the outer wall of the buffer chamber has a mounting hole for inserting the second pressure sensor. The sensing end of the second pressure sensor is inserted into the buffer chamber through the mounting hole for real-time air pressure monitoring.
[0012] Preferably, for controlling the outer and inner gates: a first hydraulic rod is provided on the side of the outer gate away from the buffer chamber for moving the outer gate; a second hydraulic rod is provided at the top of the inner gate for moving the inner gate; the input ends of both the first and second hydraulic rods are electrically connected to the output end of the controller. The second hydraulic rod moves the inner gate vertically, thereby controlling the separation or connection between the microwave drying chamber and the buffer chamber; the first hydraulic rod moves the outer gate horizontally, connecting or separating the buffer chamber from the outside world.
[0013] Preferably, to maintain the airtightness of the buffer chamber: a sealing strip is fixedly connected to the bottom end of the inner gate for sealing the inner gate and the top end of the track conveyor; an insertion hole for inserting the inner gate is provided at the top end of the buffer chamber; a sealing ring is fixedly connected to the inner wall of the insertion hole for sealing between the inner gate and the insertion hole. Through the action of the inner gate and the sealing strip, the first opening is closed; and through the sealing ring, the insertion hole and the inner gate are sealed, thereby ensuring the airtightness of the buffer chamber.
[0014] Preferably, for ease of process control: the input terminals of both the first and second vacuum pumps are electrically connected to the output terminal of the controller, and the output terminals of both the first and second pressure sensors are electrically connected to the input terminal of the controller. The controller controls the second vacuum pump, the first vacuum pump, the first hydraulic rod, and the second hydraulic rod respectively, thereby achieving continuous drying operations.
[0015] This application utilizes a design incorporating a buffer assembly, a sealing assembly, a controller, a first pressure sensor, and a second sensor. The first and second pressure sensors monitor the air pressure inside the microwave drying chamber and the buffer chamber in real time. The controller then activates a first hydraulic rod to open the outer gate, allowing material to be placed on top of the conveyor belt. The first hydraulic rod is then controlled to push the outer gate into contact with the buffer chamber, closing it. Once the pressure difference between the buffer chamber and the microwave drying chamber is within a set range, the second hydraulic rod is controlled to move the inner gate vertically, allowing the material to be dried inside the conveyor belt. The material is then transferred to the buffer chamber via the buffer assembly at the other end of the microwave drying chamber, and finally, the outer gate is opened to remove the dried material. This eliminates the need for frequent vacuum breaking and re-vacuuming operations inside the microwave drying chamber, reducing waiting time and enabling continuous material drying. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of a continuous vacuum microwave negative pressure drying device;
[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the microwave drying chamber and buffer assembly;
[0018] Figure 3 for Figure 2 Schematic diagram of the structure of the microwave drying chamber and the tracked conveyor;
[0019] Figure 4 for Figure 2 A schematic diagram of the intermediate buffer component;
[0020] Figure 5 for Figure 4 Schematic diagram of the structure of the inner gate;
[0021] Figure 6 for Figure 4 Schematic diagram of the intermediate buffer chamber;
[0022] Figure 7 for Figure 6 A magnified structural diagram of A.
[0023] In the picture:
[0024] 1. Microwave drying chamber; 2. First vacuum pump; 3. Connecting pipe; 4. Buffer assembly; 41. Buffer chamber; 42. Outer gate; 43. First hydraulic rod; 44. Inner gate; 45. Second hydraulic rod; 46. Sealing strip; 47. Sealing ring; 5. Tracked conveyor; 6. Sealing assembly; 61. Sealing sleeve; 62. Sealing ring; 7. Controller; 8. First pressure sensor; 9. Second pressure sensor; 10. Second vacuum pump. Detailed Implementation
[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0026] This embodiment provides a continuous vacuum microwave negative pressure drying device, such as... Figure 1-7 As shown, the drying equipment includes a microwave drying chamber 1 and a first vacuum pump 2 installed outside the microwave drying chamber 1 for evacuating the inside of the microwave drying chamber 1.
[0027] To ensure continuous material drying: buffer components 4 are symmetrically arranged at both ends of the microwave drying chamber 1 for material drying buffering; connecting pipes 3 are arranged through the end of the microwave drying chamber 1 for connecting with the buffer components 4; a conveyor belt 5 is arranged through the microwave drying chamber 1 and the first vacuum pump 2 for material transfer; a second vacuum pump 10 is arranged outside the buffer components 4 for vacuuming the buffer components 4; a first pressure sensor 8 is interspersed in the wall of the microwave drying chamber 1 for monitoring the internal air pressure of the microwave drying chamber 1; a second pressure sensor 9 is interspersed in the wall of the buffer components 4 for monitoring the internal air pressure of the buffer components 4; and a controller 7 is arranged on the outer wall of the microwave drying chamber 1 for controlling the first vacuum pump 2, the buffer components 4, and the second vacuum pump 10. The air pressure inside the microwave drying chamber 1 and the buffer chamber 41 is monitored in real time by the first pressure sensor 8 and the second pressure sensor 9, respectively. Then, the controller 7 activates the first hydraulic rod 43 to open the outer gate 42 and place the material on the top of the conveyor belt 5. Then, the first hydraulic rod 43 is controlled to push the outer gate 42 into contact with the buffer chamber 41, closing the buffer chamber 41. After the air pressure difference between the buffer chamber 41 and the microwave drying chamber 1 is within the set range, the second hydraulic rod 45 is controlled to drive the inner gate 44 to move vertically, thereby drying the material inside the conveyor belt 5. Then, the inner gate 44 is opened sequentially through the buffer assembly 4 at the other end of the microwave drying chamber 1 to move the material into the buffer chamber 41. Finally, the outer gate 42 is opened to remove the dried material. This eliminates the need for frequent vacuum breaking and vacuuming operations inside the microwave drying chamber 1, reducing waiting time and enabling continuous drying of the material.
[0028] Furthermore, the microwave drying chamber 1 is an existing microwave dryer, with a microwave generator installed inside for drying materials. The crawler conveyor 5 is an existing crawler conveyor, with the crawler made of PTFE-coated fiberglass belt. The crawler has multiple sprockets and rollers inside, with a motor installed at one end of one roller to drive the rotation of the sprocket, thereby realizing the rotation of the crawler. This is a common technical means in the existing technical field. The two ends of the roller are connected to the buffer chamber 41 and the outer wall of the microwave drying chamber 1. Two sets of buffer components 4 are symmetrically arranged, located at the feed end and discharge end of the microwave drying chamber 1, respectively.
[0029] Specifically, for material transfer: the microwave drying chamber 1 has symmetrically arranged first and second openings at both ends for inserting the tracked conveyor 5. The tracked conveyor 5 has symmetrically arranged sealing components 6 on both sides for sealing between the tracked conveyor 5 and the microwave drying chamber 1 and the buffer assembly 4. The walls of the microwave drying chamber 1 and the buffer assembly 4 each have circular holes for installing the sealing components 6. By inserting the tracked conveyor 5 through the two buffer assemblies 4 and the microwave drying chamber 1, material is sequentially transferred between one buffer assembly 4, the microwave drying chamber 1, and the other buffer assembly 4. The first opening is for inserting the top of the tracked conveyor 5, facilitating material transfer into the microwave drying chamber 1. The size of the second opening is adapted to the bottom size of the tracked conveyor 5, thereby reducing the gap between the second opening and the bottom track of the tracked conveyor 5.
[0030] More specifically, to maintain the vacuum effect between the microwave drying chamber 1 and the buffer chamber 41: the sealing assembly 6 includes a sealing sleeve 61 and a sealing ring 62 fitted on the outer wall of the sealing sleeve 61 for sealing between the sealing sleeve 61 and the circular hole. Through the installation of the sealing sleeve 61 and the sealing ring 62, the conveyor belt 5 can operate normally while maintaining the vacuum between the microwave drying chamber 1 and the buffer chamber 41. The sealing sleeve 61 is fitted on the outer wall of the roller end. The sealing sleeve 61 adopts an existing magnetohydrodynamic sealing sleeve. The sealing ring 62 is fitted on the outer wall of the sealing sleeve 61, ensuring that the roller can rotate while maintaining the seal between the microwave drying chamber 1 and the buffer chamber 41. The sealing ring 62 can be an existing labyrinth-type sealing ring, which blocks residual particles.
[0031] Specifically, for feeding the buffer chamber 41: the buffer assembly 4 includes a buffer chamber 41 located at the end of the connecting pipe 3 away from the microwave drying chamber 1, an outer gate 42 located at the end of the buffer chamber 41 away from the connecting pipe 3 for closing the buffer chamber 41, and an inner gate 44 located at the end of the buffer chamber 41 near the connecting pipe 3 for closing the first opening. The buffer chamber 41 is opened or closed by moving the inner gate 44 and the outer gate 42.
[0032] More specifically, to facilitate monitoring of the internal air pressure of the buffer chamber 41, the outer wall of the buffer chamber 41 is provided with a mounting hole for inserting the second pressure sensor 9. The detection end of the second pressure sensor 9 is inserted into the buffer chamber 41 through the mounting hole for real-time air pressure monitoring.
[0033] Specifically, for controlling the outer gate 42 and the inner gate 44: a first hydraulic rod 43 for moving the outer gate 42 is provided on the side of the outer gate 42 away from the buffer chamber 41, and a second hydraulic rod 45 for moving the inner gate 44 is provided at the top of the inner gate 44. The input ends of both the first hydraulic rod 43 and the second hydraulic rod 45 are electrically connected to the output end of the controller 7. The second hydraulic rod 45 moves the inner gate 44 vertically, thereby controlling the separation or connection between the microwave drying chamber 1 and the buffer chamber 41. The first hydraulic rod 43 moves the outer gate 42 horizontally, connecting or separating the buffer chamber 41 from the outside world. The output end of the first hydraulic rod 43 is fixed to the contact part of the outer gate 42 by bolts, and the output end of the second hydraulic rod 45 is fixed to the top of the inner gate 44 by bolts. Both the first hydraulic rod 43 and the second hydraulic rod 45 are electrically connected to the controller 7 through wires to control the outer gate 42 and the inner gate 44. Both the first hydraulic rod 43 and the second hydraulic rod 45 are existing electro-hydraulic telescopic rods. The bottom end of the second hydraulic rod 45 is provided with a mounting bracket, and the bottom end of the mounting bracket is fixedly connected to the top of the buffer chamber 41 by bolts.
[0034] More specifically, to maintain the seal of the buffer chamber 41: a sealing strip 46 is fixedly connected to the bottom end of the inner gate 44 for sealing the top of the inner gate 44 and the track conveyor 5; an insertion hole for inserting the inner gate 44 is opened at the top of the buffer chamber 41; and a sealing ring 47 is fixedly connected to the inner wall of the insertion hole for sealing between the inner gate 44 and the insertion hole. Through the action of the inner gate 44 and the sealing strip 46, the first opening is closed; and through the sealing ring 47, the insertion hole and the inner gate 44 are sealed, thereby ensuring the seal of the buffer chamber 41. Both the sealing strip 46 and the sealing ring 47 are made of rubber; the sealing strip 46 is bonded and fixed to the contact part with the inner gate 44, and the sealing ring 47 is bonded and fixed to the contact part with the insertion hole.
[0035] Specifically, for ease of process control: the input terminals of both the first vacuum pump 2 and the second vacuum pump 10 are electrically connected to the output terminal of the controller 7, and the output terminals of both the first pressure sensor 8 and the second pressure sensor 9 are electrically connected to the input terminal of the controller 7. The controller 7 controls the second vacuum pump 10, the first vacuum pump 2, the first hydraulic rod 43, and the second hydraulic rod 45 respectively, thereby achieving continuous drying operations. The first pressure sensor 8 is an existing PLC that can be programmed to control multiple devices sequentially, such as an S7-1200 PLC. During overall device operation, two sets of buffer components 4 are installed at the feed and discharge ends of the microwave drying chamber 1, respectively. The first pressure sensor 8 first controls the first hydraulic rod 43 at the feed end of the microwave drying chamber 1, causing the outer gate 42 to move away from the buffer chamber 41. At this time, the inner gate 44 at the feed end remains stationary, allowing the material to be placed on top of the conveyor belt 5 for transport. Then, the first hydraulic rod 43 is controlled to move the outer gate 42 to close the end of the buffer chamber 41. Next, the second hydraulic rod 45 is controlled to move the inner gate 44 vertically upwards, transferring the material into the microwave drying chamber 1 via the conveyor belt 5. At this point, the inner gate... Door 44 moves vertically downwards to close the first opening, allowing the microwave drying chamber 1 to dry the material. Then, the second hydraulic rod 45 at the discharge end of the microwave drying chamber 1 is opened, allowing the dried material to be transferred to the buffer chamber 41 at the discharge end. After the inner gate 44 closes, the outer gate 42 is opened to remove the material, completing the drying process. The first pressure sensor 8 and the second pressure sensor 9 are existing equipment. When the inner gate 44 opens, the controller 7 controls the first vacuum pump 2 to speed up to counteract gas leakage. The controller 7 transmits the air pressure data inside the buffer chamber 41 and the microwave drying chamber 1 to the controller in real time. The second hydraulic rod 45 can only be activated to open the inner gate 44 when the air pressure difference between the buffer chamber 41 and the microwave drying chamber 1 is less than or equal to 100 Pa.
[0036] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.
Claims
1. A continuous vacuum microwave negative pressure drying device, comprising a microwave drying chamber (1) and a first vacuum pump (2) disposed outside the microwave drying chamber (1) for drawing a vacuum inside the microwave drying chamber (1). Its features are: A buffer assembly (4) symmetrically arranged at both ends of the microwave drying chamber (1) for material drying buffering; a connecting pipe (3) through the end of the microwave drying chamber (1) for connecting with the buffer assembly (4); a track conveyor (5) through the microwave drying chamber (1) and the first vacuum pump (2) for material transfer; a second vacuum pump (10) arranged outside the buffer assembly (4) for vacuuming the buffer assembly (4); a first pressure sensor (8) interspersed in the wall of the microwave drying chamber (1) for monitoring the internal air pressure of the microwave drying chamber (1); a second pressure sensor (9) interspersed in the wall of the buffer assembly (4) for monitoring the internal air pressure of the buffer assembly (4); and a controller (7) arranged on the outer wall of the microwave drying chamber (1) for controlling the first vacuum pump (2), the buffer assembly (4), and the second vacuum pump (10).
2. The continuous vacuum microwave negative pressure drying equipment according to claim 1, characterized in that: The microwave drying chamber (1) has a first opening and a second opening symmetrically provided at both ends for inserting the track conveyor (5). The track conveyor (5) has sealing components (6) symmetrically provided on both sides for sealing between the track conveyor (5), the microwave drying chamber (1), and the buffer assembly (4). The walls of the microwave drying chamber (1) and the buffer assembly (4) are respectively provided with round holes for installing the sealing components (6).
3. The continuous vacuum microwave negative pressure drying equipment according to claim 2, characterized in that: The sealing assembly (6) includes a sealing sleeve (61) and a sealing ring (62) fitted on the outer wall of the sealing sleeve (61) for sealing between the sealing sleeve (61) and the circular hole.
4. The continuous vacuum microwave negative pressure drying equipment according to claim 2, characterized in that: The buffer assembly (4) includes a buffer chamber (41) disposed at the end of the connecting pipe (3) away from the microwave drying chamber (1), an outer gate (42) disposed at the end of the buffer chamber (41) away from the connecting pipe (3) for closing the buffer chamber (41), and an inner gate (44) disposed at the end of the buffer chamber (41) near the connecting pipe (3) for closing the first opening.
5. The continuous vacuum microwave negative pressure drying equipment according to claim 4, characterized in that: The outer wall of the buffer chamber (41) is provided with mounting holes for inserting the second pressure sensor (9).
6. The continuous vacuum microwave negative pressure drying equipment according to claim 4, characterized in that: The outer gate (42) is provided with a first hydraulic rod (43) on the side away from the buffer chamber (41) for moving the outer gate (42), and the top of the inner gate (44) is provided with a second hydraulic rod (45) for moving the inner gate (44). The input ends of the first hydraulic rod (43) and the second hydraulic rod (45) are electrically connected to the output end of the controller (7).
7. The continuous vacuum microwave negative pressure drying equipment according to claim 6, characterized in that: The bottom end of the inner gate (44) is fixedly connected to a sealing strip (46) for sealing the inner gate (44) and the top end of the track conveyor (5). The top end of the buffer chamber (41) is provided with an insertion hole for inserting the inner gate (44). The inner wall of the insertion hole is fixedly connected to a sealing ring (47) for sealing between the inner gate (44) and the insertion hole.
8. The continuous vacuum microwave negative pressure drying equipment according to claim 1, characterized in that: The input terminals of the first vacuum pump (2) and the second vacuum pump (10) are electrically connected to the output terminal of the controller (7), and the output terminals of the first pressure sensor (8) and the second pressure sensor (9) are electrically connected to the input terminal of the controller (7).