A multi-stage temperature-controlled circulating drying system for processing dried persimmons

Abstract

This invention relates to the field of fruit drying equipment technology, and discloses a multi-stage temperature-controlled circulating drying system for persimmon processing. The system includes a drying chamber with a support assembly for placing persimmons inside. A blower mechanism is installed at the bottom of the drying chamber, and multiple branch air ducts are arranged on the outside of the drying chamber, with the bottom ends of each branch air duct connected to the blower mechanism. Multiple blower rings are fixedly installed inside the drying chamber, with multiple air inlets on their inner sides. Multiple regulating pipes are installed on one side of each branch air duct, with one end of each regulating pipe connected to a blower ring. Regulating components are installed inside each regulating pipe. This invention achieves multi-stage heating at various heights by equidistantly distributed blower rings and corresponding regulating components within the drying chamber, ensuring consistent temperature at all heights. This solves the problem in traditional drying devices where fruit on the top rack dries slower than fruit on the bottom rack, thus improving the uniformity of persimmon drying.

Description

Technical Field

[0001] This invention relates to the field of fruit drying equipment technology, specifically a multi-stage temperature-controlled circulating drying system for processing dried persimmons. Background Technology

[0002] The drying system used for persimmon processing is an advanced piece of equipment specifically designed for dehydrating and preserving persimmons. By precisely controlling temperature, humidity, and airflow, the system ensures that the persimmons lose water evenly during the drying process, thus maintaining their color, texture, and nutritional components. This drying technology effectively prevents persimmons from rotting during storage and transportation, extending their shelf life and providing consumers with a healthy and delicious snack option.

[0003] Chinese patent CN109717496A discloses a drying device for persimmon cake production, including a pit and a sealed box. The pit is fixedly connected to the sealed box by bolts. A connecting pipe is fixedly connected inside the sealed box. A housing, a heating plate, and a first negative pressure machine are sequentially fixedly connected to one side of the connecting pipe. The first negative pressure machine extends out of the pit through the pipe. Absorbent cotton is movably connected inside the connecting pipe, and a hot air fan is installed through the pipe above the connecting pipe. This invention, through the design of the guide surface, creates a guide flow when the air passes through, making the airflow more even. The annular guide surface can evenly dry the persimmons from all sides, resulting in a larger drying area and higher quality. Compared with existing drying devices, this design makes the airflow inside the device closer to natural wind.

[0004] As shown in the patent above, existing drying devices generally use multiple upper and lower racks to place persimmons and use a blower mechanism at the bottom to blow hot air to dry the persimmons placed on the racks. However, if the hot air generated by the blower mechanism mainly flows upward, the dried fruit on the upper rack will dry slower than the dried fruit on the lower rack because the hot air will gradually cool down as it rises. This results in a decrease in the drying efficiency of the dried fruit on the upper rack, leading to uneven drying of the persimmons.

[0005] Therefore, it is necessary to provide a multi-stage temperature-controlled circulating drying system for persimmon processing to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-stage temperature-controlled circulating drying system for processing dried persimmons. By setting up equidistant blower rings and corresponding adjustment components in the drying chamber, multi-stage heating at various heights can be achieved, so that the temperature at various heights in the drying chamber remains consistent.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a multi-stage temperature-controlled circulating drying system for persimmon processing, comprising a drying box, a support assembly for placing persimmons is provided inside the drying box, a blower mechanism is installed at the bottom of the drying box, multiple branch air ducts are provided on the outside of the drying box, the bottom ends of the multiple branch air ducts are all connected to the blower mechanism, multiple blower rings are fixedly installed inside the drying box, multiple blower ports are opened on the inner side of the blower rings, multiple regulating pipes are installed on one side of the branch air ducts, one end of the regulating pipe is connected to the blower ring, regulating components are provided inside the regulating pipes, and multiple temperature detection components are provided on the drying box.

[0008] A further configuration of the present invention is as follows: the blower mechanism includes an air pump, an air outlet pipe, and a distribution box. The distribution box is fixedly installed at the bottom of the drying oven. The air outlet end of the air pump is connected to the air outlet pipe. The top end of the air outlet pipe is connected to the distribution box. A heating element is provided inside the distribution box. The bottom ends of multiple distribution pipes are all connected to the distribution box.

[0009] A further feature of the present invention is that: a top cover is installed on the top of the drying oven, the top cover is hollow, a plurality of air suction holes are opened at the bottom of the top cover, a plurality of filter screens are arranged in the air suction holes, an exhaust pipe is connected to the top of the top cover, an air inlet pipe is connected to the air inlet of the air pump, a condensation device is arranged at the top of the air inlet pipe, a return air pipe is arranged at the top of the condensation device, the return air pipe is connected to the air inlet pipe, and one end of the exhaust pipe is inserted into the top of the return air pipe.

[0010] A further configuration of the present invention is as follows: a second reducer is fixedly installed at the bottom of the diversion box, a motor is provided on the air pump, the output end of the motor is fixedly connected to the input end of the second reducer, a rotating shaft is fixedly connected to the output end of the second reducer, the top end of the rotating shaft extends into the drying chamber, and a rotating disk is fixedly installed at the top end of the rotating shaft, and the support assembly is placed on the rotating disk.

[0011] A further configuration of the present invention is as follows: the support assembly includes a support cylinder and a bracket; a positioning column is fixedly installed at the center of the top of the rotating disk; the positioning column passes through the support cylinder; multiple brackets are installed on the support cylinder; and a support net is installed on the brackets.

[0012] A further configuration of the present invention is as follows: the regulating assembly includes a regulating motor, a first reducer, and a valve plate; the valve plate is rotatably mounted inside the regulating tube; the first reducer is mounted on one side of the regulating tube; and the output end of the regulating motor is connected to the valve plate via the first reducer.

[0013] A further configuration of the present invention is as follows: the temperature detection assembly includes a temperature sensor, a second cylinder, a second piston rod, and a second piston. The second cylinder is fixedly installed on the outside of the drying oven, and the second piston is slidably installed inside the second cylinder. One end of the second piston rod extends into the second cylinder and is fixedly connected to the second piston, and the other end of the second piston rod is fixedly connected to the temperature sensor.

[0014] A further configuration of the present invention is as follows: a first cylinder is fixedly installed on the top of the outer side of the drying oven; a first piston is slidably installed inside the first cylinder; a spring is provided at the bottom end of the first piston; the first piston is elastically connected to the bottom wall of the first cylinder through the spring; a first stopper rod is fixedly installed at the top end of the first piston; an oil supply pipe is connected to the bottom end of the first cylinder; a diverter pipe is connected to one end of the oil supply pipe; one end of a plurality of second cylinders is connected to the diverter pipe; the first cylinder, the second cylinders, the diverter pipe, and the oil supply pipe are filled with oil; a pressure block is fixedly installed on one side of the top cover; the pressure block is positioned directly above the first stopper rod.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. This invention enables multi-stage heating at various heights by setting up equidistant blower rings and corresponding adjustment components in the drying oven, ensuring that the temperature at various heights in the drying oven remains consistent. This solves the problem in traditional drying devices where dried fruit on the top rack dries slower than dried fruit on the bottom rack, thereby improving the uniformity of persimmon drying.

[0017] 2. The temperature detection component is signal-connected to the adjustment component at the same height, allowing for automatic adjustment of the hot airflow based on the temperature at the location of the temperature detection component. This automated control not only improves drying efficiency but also ensures precise temperature control during the drying process, further guaranteeing drying quality.

[0018] 3. When the air pump is working, it drives the rotating shaft to rotate at a low speed through the reducer, which in turn causes the support components on the rotating disk to rotate. This rotation mechanism makes the persimmons on all positions of the support components heat more evenly, further improving the uniformity and efficiency of drying.

[0019] 4. Through an innovatively designed hydraulic system, the temperature sensor automatically moves to the center of the drying chamber when the top cover is closed, allowing for better temperature detection in the center. When the top cover is open, the temperature sensor automatically resets to avoid interfering with the removal of the support components. This design improves the accuracy of temperature detection and ease of operation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the present invention after removing the drying box and support components;

[0023] Figure 4 This is a schematic diagram of the structure of the adjustment component of the present invention;

[0024] Figure 5 This is a schematic diagram of the structure of the bottom of the top cover of the present invention;

[0025] Figure 6 This is a schematic diagram of the structure of the support component of the present invention;

[0026] Figure 7 This is a schematic diagram of the temperature detection component of the present invention;

[0027] Figure 8 This is a cross-sectional view of the first cylinder of the present invention.

[0028] In the diagram: 1. Drying oven; 2. Diverter box; 3. Diverter duct; 4. Regulating pipe; 5. Regulating motor; 6. First reducer; 7. Valve plate; 8. Blower ring; 9. Air pump; 10. Second reducer; 11. Rotating shaft; 12. Air outlet duct; 13. Air inlet duct; 14. Condensation device; 15. Return air duct; 16. Exhaust duct; 17. Top cover; 18. Filter screen; 19. Heating element; 20. Rotary disc; 21. Positioning column; 22. First cylinder; 23. First piston rod; 24. First piston; 25. Spring; 26. Oil supply pipe; 27. Diverter pipe; 28. Second cylinder; 29. ​​Second piston rod; 30. Second piston; 31. Temperature sensor; 32. Pressure block; 33. Support cylinder; 34. Bracket; 35. Support net. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] Please see Figures 1-6In this embodiment of the invention, a multi-stage temperature-controlled circulating drying system for persimmon processing includes a drying chamber 1. The drying chamber 1 is equipped with a support assembly for placing persimmons. A blower mechanism is installed at the bottom of the drying chamber 1. Multiple branch air ducts 3 are arranged on the outside of the drying chamber 1, with the bottom ends of each branch air duct 3 connected to the blower mechanism. Multiple blower rings 8 are fixedly installed inside the drying chamber 1, arranged equidistantly. Multiple air inlets are opened on the inner side of each blower ring 8. Multiple regulating pipes 4 are installed on one side of each branch air duct 3, with one end of each regulating pipe 4 connected to the blower ring 8. A regulating component is installed inside each regulating pipe 4. Multiple temperature detection components are installed on the drying chamber 1, and these temperature detection components are signal-connected to the regulating components located at the same height, enabling the regulating components to automatically adjust the flow rate of the hot airflow based on the temperature at the location of the temperature detection components.

[0031] In practical use, the blower mechanism blows air into the distribution duct 3, causing the hot airflow to enter the blower ring 8 through the regulating pipe 4, and then be blown into the drying chamber 1 through the blower outlet on the inner side of the blower ring 8, thereby drying the persimmons placed on the support assembly in the drying chamber 1. Through the setting of the temperature detection component, the regulating component can automatically adjust the flow rate of the hot airflow according to the temperature at the location of the temperature detection component, realizing multi-stage heating at various heights, thus keeping the temperature at various heights in the drying chamber 1 consistent. Furthermore, by setting the annular blower ring 8, the airflow can enter the drying chamber 1 evenly, effectively improving the uniformity of persimmon drying.

[0032] In this embodiment, preferably, the blower mechanism includes an air pump 9, an air outlet pipe 12, and a distribution box 2. The distribution box 2 is fixedly installed at the bottom of the drying chamber 1. The air outlet end of the air pump 9 is connected to the air outlet pipe 12, and the top end of the air outlet pipe 12 is connected to the distribution box 2. A heating element 19 is provided inside the distribution box 2. The heating element 19 can be a heating structure such as an electric heating tube or an electric heating wire. The bottom ends of multiple distribution pipes 3 are all connected to the distribution box 2. The drying chamber 1 A top cover 17 is installed at the top of the device. The top cover 17 is hollow and has multiple air intake holes at its bottom. Multiple filters 18 are installed inside the air intake holes. An exhaust pipe 16 is connected to the top of the top cover 17. An air inlet pipe 13 is connected to the air inlet of the air pump 9. A condenser 14 is installed at the top of the air inlet pipe 13. A return air pipe 15 is installed at the top of the condenser 14. The return air pipe 15 is connected to the air inlet pipe 13. The exhaust... One end of pipe 16 is inserted into the top of return air pipe 15, and a sealing gasket is provided at the insertion point. When the top cover 17 is locked on the drying oven 1, the exhaust pipe 16 is connected to the return air pipe 15. The condensing device 14 can condense the hot air in the return air pipe 15 and the inlet air pipe 13 to remove moisture from the air. The condensing device 14 is existing technology and will not be described in detail. A drain pipe is provided below the condensing device 14 so that the condensate can be discharged. Under the action of the air pump 9, the airflow enters the distribution box 2 through the outlet air pipe 12, then enters the distribution air pipe 3, and finally enters the blower ring 8 through the regulating pipe 4 and is blown out through the blower outlet. After the blown hot air rises, it enters the top cover 17 through the air intake below the top cover 17, then enters the return air pipe 15 through the exhaust pipe 16, and then enters the condensing device 14 to condense the hot air and remove moisture. The airflow then enters the air inlet of the air pump 9 through the inlet air pipe 13, thereby realizing the circulation heating and dehumidification of the gas.

[0033] In this embodiment, preferably, a second reducer 10 is fixedly installed at the bottom of the diversion box 2, and a motor is provided on the air pump 9. The motor is used to drive the impeller inside the air pump 9 to rotate. The output end of the motor is fixedly connected to the input end of the second reducer 10. A rotating shaft 11 is fixedly connected to the output end of the second reducer 10. The top end of the rotating shaft 11 extends into the drying chamber 1, and a rotating disk 20 is fixedly installed on the top end of the rotating shaft 11. The support assembly is placed on the rotating disk 20. When the air pump 9 is working, the output end of the motor drives the impeller to rotate, and can drive the rotating shaft 11 to rotate at a lower speed through the second reducer 10, so that the rotating disk 20 at the top end of the rotating shaft 11 rotates, thereby driving the support assembly on the rotating disk 20 to rotate, so that the persimmons at various positions on the support assembly are heated more evenly.

[0034] In this embodiment, preferably, the support assembly includes a support cylinder 33 and a bracket 34. A positioning post 21 is fixedly installed at the center of the top of the rotating disk 20. The positioning post 21 passes through the support cylinder 33. Multiple brackets 34 are installed on the support cylinder 33, and a support net 35 is installed on the brackets 34. The support cylinder 33 can be pulled out from the positioning post 21, thereby taking out the brackets 34 together to remove the dried persimmons on the brackets 34. Multiple support assemblies can be equipped so that when placing and removing dried persimmons, dried persimmons on another support assembly can be dried, improving drying efficiency.

[0035] In this embodiment, preferably, the regulating component includes a regulating motor 5, a first reducer 6, and a valve plate 7. The valve plate 7 is rotatably installed inside the regulating pipe 4. The first reducer 6 is installed on one side of the regulating pipe 4. The output end of the regulating motor 5 is connected to the valve plate 7 through the first reducer 6, so that the output end of the regulating motor 5 can drive the valve plate 7 to rotate at a lower speed through the first reducer 6, thereby regulating the gas flow rate in the regulating pipe 4.

[0036] Please see Figure 3 , Figure 7 and Figure 8In this embodiment of the invention, the temperature detection assembly includes a temperature sensor 31, a second cylinder 28, a second piston rod 29, and a second piston 30. The second cylinder 28 is fixedly installed on the outside of the drying oven 1. The second piston 30 is slidably installed inside the second cylinder 28. One end of the second piston rod 29 extends into the second cylinder 28 and is fixedly connected to the second piston 30. The other end of the second piston rod 29 is fixedly connected to the temperature sensor 31. The temperature sensor 31 is electrically connected to two adjusting motors 5 at the same height via a PLC controller, thereby adjusting the rotation angle of the valve plate 7 according to the temperature, so that multiple temperature sensors can be used. The temperature at the location of sensor 31 is consistent. A first cylinder 22 is fixedly installed on the top of the outer side of the drying oven 1. A first piston 24 is slidably installed inside the first cylinder 22. A spring 25 is provided at the bottom end of the first piston 24. The first piston 24 is elastically connected to the bottom wall of the first cylinder 22 through the spring 25. A first stopper rod 23 is fixedly installed at the top end of the first piston 24. An oil supply pipe 26 is connected to the bottom end of the first cylinder 22. A diverter pipe 27 is connected to one end of the oil supply pipe 26. One end of a plurality of second cylinders 28 is connected to the diverter pipe 27. The first cylinder 22, the first... The cylinder 28, the distributor pipe 27, and the oil supply pipe 26 are filled with oil. A pressure block 32 is fixedly installed on one side of the top cover 17, and the pressure block 32 is positioned directly above the first piston rod 23. When the top cover 17 closes the top opening of the drying chamber 1, the pressure block 32 pushes the first piston 24 downward through the first piston rod 23, causing the oil in the first cylinder 22 to enter the second cylinder 28 through the oil supply pipe 26 and the distributor pipe 27. This pushes the second piston 30 in the second cylinder 28 towards the interior of the drying chamber 1. When the second piston 30 moves, it drives the temperature sensor 31 to move through the second piston rod 29. This allows the temperature sensor 31 to move closer to the positioning post 21, thus better detecting the temperature in the middle of the drying chamber 1. After the top cover 17 is opened, the first piston 24 moves upward under the elastic action of the spring 25, causing the oil to flow back into the first cylinder 22, thereby causing the temperature sensor 31 to move and reset, preventing the temperature sensor 31 from interfering with the removal of the support assembly. The movable temperature sensor 31 allows it to automatically move to the middle position of the drying chamber 1 when the top cover 17 is closed, and automatically reset when the top cover 17 is removed, without requiring other operations, and with good synchronization.

[0037] Working principle: During use, under the action of air pump 9, the airflow enters the distribution box 2 through the air outlet duct 12, then enters the distribution air duct 3, and finally enters the blower ring 8 through the regulating pipe 4 and is blown out through the blower outlet, thereby drying the persimmons placed on the support net 35 in the drying box 1. After the blown hot airflow rises, it enters the top cover 17 through the air inlet below the top cover 17, then enters the return air duct 15 through the exhaust pipe 16, and then enters the condenser 14 to condense the hot airflow and remove the moisture. The airflow then enters the air inlet of air pump 9 through the air inlet pipe 13, thereby realizing the circulation of gas for heating and dehumidification.

[0038] At the same time, when the air pump 9 is working, the output end of the motor drives the impeller to rotate, and can drive the rotating shaft 11 to rotate at a lower speed through the second reducer 10, so that the rotating disk 20 at the top of the rotating shaft 11 rotates, thereby driving the support component on the rotating disk 20 to rotate, so that the persimmons at various positions on the support component are heated more evenly.

[0039] When the top cover 17 closes the top opening of the drying chamber 1, under the action of the pressure block 32, the first piston 24 is pushed downward by the first stopper rod 23, so that the oil in the first cylinder 22 is input into the second cylinder 28 through the oil supply pipe 26 and the diversion pipe 27, thereby pushing the second piston 30 in the second cylinder 28 toward the interior of the drying chamber 1. When the second piston 30 moves, it drives the temperature sensor 31 to move through the second stopper rod 29, so that the temperature sensor 31 moves to the temperature close to the positioning column 21, thereby better detecting the temperature in the middle of the drying chamber 1. After the top cover 17 is opened, under the elastic action of the spring 25, the first piston 24 moves upward, so that the oil flows back into the first cylinder 22, thereby causing the temperature sensor 31 to move and reset, so as to prevent the temperature sensor 31 from interfering with the removal of the support assembly. The temperature sensor 31 is electrically connected to two adjusting motors 5 at the same height through the PLC controller, so as to adjust the rotation angle of the valve plate 7 according to the temperature to control the outflow of hot air, so that the temperature of multiple temperature sensors 31 is consistent.

[0040] After drying, the support cylinder 33 is pulled out from the positioning column 21, thereby taking out the bracket 34 as well, so that the dried persimmons on the bracket 34 can be taken out. Multiple support components can be equipped, so that when placing and taking out the dried persimmons, the dried persimmons on another support component can be dried, thus improving the drying efficiency.

[0041] The above description is only a preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included in the scope of this patent application.

Claims

1. A multi-stage temperature-controlled circulating drying system for processing dried persimmons, comprising a drying chamber (1), wherein a support assembly for placing persimmons is provided inside the drying chamber (1), and a blower mechanism is installed at the bottom of the drying chamber (1), characterized in that: The drying box (1) is provided with multiple branch air ducts (3) on the outside. The bottom ends of the multiple branch air ducts (3) are connected to the blower mechanism. Multiple blower rings (8) are fixedly installed inside the drying box (1). Multiple blower ports are opened on the inner side of the blower rings (8). Multiple regulating pipes (4) are installed on one side of the branch air ducts (3). One end of the regulating pipe (4) is connected to the blower ring (8). Regulating components are provided inside the regulating pipe (4). Multiple temperature detection components are provided on the drying box (1). The top of the drying oven (1) is equipped with a top cover (17), which is hollow. Multiple air suction holes are opened at the bottom of the top cover (17), and multiple filter screens (18) are installed inside the air suction holes. An exhaust pipe (16) is connected to the top of the top cover (17). The temperature detection assembly includes a temperature sensor (31), a second cylinder (28), a second piston rod (29), and a second piston (30). The second cylinder (28) is fixedly installed on the outside of the drying oven (1). The second piston (30) is slidably installed inside the second cylinder (28). One end of the second piston rod (29) extends into the second cylinder (28) and is fixedly connected to the second piston (30). The other end of the second piston rod (29) is fixedly connected to the temperature sensor (31). A first cylinder (22) is fixedly installed on the top of the outside of the drying box (1). A first piston (24) is slidably installed inside the first cylinder (22). A spring (25) is provided at the bottom end of the first piston (24). The first piston (24) is elastically connected to the bottom wall of the first cylinder (22) through the spring (25). A first stopper rod (23) is fixedly installed at the top end of the first piston (24). An oil supply pipe (26) is connected to the bottom end of the first cylinder (22). A diverter pipe (27) is connected to one end of the oil supply pipe (26). One end of a plurality of second cylinders (28) is connected to the diverter pipe (27). The first cylinder (22), the second cylinders (28), the diverter pipe (27) and the oil supply pipe (26) are filled with oil. A pressure block (32) is fixedly installed on one side of the top cover (17). The pressure block (32) is located directly above the first stopper rod (23).

2. The multi-stage temperature-controlled circulating drying system for persimmon processing according to claim 1, characterized in that: The blower mechanism includes an air pump (9), an air outlet pipe (12), and a distribution box (2). The distribution box (2) is fixedly installed at the bottom of the drying box (1). The air outlet of the air pump (9) is connected to the air outlet pipe (12). The top end of the air outlet pipe (12) is connected to the distribution box (2). A heating element (19) is provided inside the distribution box (2). The bottom ends of multiple distribution pipes (3) are all connected to the distribution box (2).

3. The multi-stage temperature-controlled circulating drying system for persimmon processing according to claim 2, characterized in that: The air pump (9) is connected to an air inlet pipe (13), and a condenser (14) is provided at the top of the air inlet pipe (13). A return air pipe (15) is provided at the top of the condenser (14). The return air pipe (15) is connected to the air inlet pipe (13), and one end of the exhaust pipe (16) is inserted into the top of the return air pipe (15).

4. The multi-stage temperature-controlled circulating drying system for persimmon processing according to claim 2, characterized in that: The bottom end of the diversion box (2) is fixedly installed with a second reducer (10). The air pump (9) is equipped with a motor. The output end of the motor is fixedly connected to the input end of the second reducer (10). The output end of the second reducer (10) is fixedly connected with a rotating shaft (11). The top end of the rotating shaft (11) extends into the drying box (1), and a rotating disk (20) is fixedly installed on the top end of the rotating shaft (11). The support assembly is placed on the rotating disk (20).

5. A multi-stage temperature-controlled circulating drying system for persimmon processing according to claim 4, characterized in that: The support assembly includes a support cylinder (33) and a bracket (34). A positioning column (21) is fixedly installed at the center of the top of the rotating disk (20). The positioning column (21) passes through the support cylinder (33). Multiple brackets (34) are installed on the support cylinder (33). A support net (35) is installed on the bracket (34).

6. The multi-stage temperature-controlled circulating drying system for persimmon processing according to claim 1, characterized in that: The regulating assembly includes a regulating motor (5), a first reducer (6) and a valve plate (7). The valve plate (7) is rotatably installed inside the regulating tube (4). The first reducer (6) is installed on one side of the regulating tube (4). The output end of the regulating motor (5) is connected to the valve plate (7) through the first reducer (6).

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