Energy-efficient dryer

Abstract

The utility model discloses an efficient energy -conserving drying -machine relates to injection moulding processing equipment technical field, including dry material bucket, fan, heating pipe and control box, still be equipped with heat exchanger mechanism and stabilizing mechanism. Heat exchanger mechanism installs through fixed frame in dry material bucket lateral wall, its hot gas inlet pipe is linked together with the exhaust pipe of dry material bucket, and the discharge pipe is linked together with fan air inlet end, and the inside forms helical channel through spiral plate, and the heat exchange is realized to cooperation longitudinal even distribution's heat exchange copper pipe, and stabilizing mechanism includes the inductive component of the differential pressure sensor group and control module that executes the mechanism, and the mechanism is connected exhaust pipe with dry material bucket, and inductive component detects the wind resistance in vertical pipe and is fed back to control module. The utility model can recycle the waste heat of humid hot air, and preheats the air inlet to reduce the energy consumption of heating pipe, and improves the energy utilization rate, stabilizes the pipeline pressure simultaneously, guarantees the drying quality, effectively solves the problem that the heat of existing drying -machine is wasted, and the energy consumption is high, and the energy utilization rate is low.

Description

Technical Field

[0001] This utility model relates to the field of injection molding equipment technology, and in particular to a high-efficiency and energy-saving dryer. Background Technology

[0002] In the injection molding process, the moisture content of plastic granules (especially hygroscopic engineering plastics such as nylon, polycarbonate, and PET) directly affects the molding quality of the injection-molded product. Residual moisture in the plastic granules can lead to defects such as bubbles, silver streaks, shrinkage marks, and warping in the molded product, severely impacting its dimensional stability and mechanical properties. Therefore, drying the plastic granules before injection molding is a crucial pretreatment step to ensure the quality of the injection-molded product.

[0003] In the existing technology, the plastic granule dryers commonly used in the injection molding field mainly include core components such as fans, heating tubes, drying hoppers, and exhaust pipes. The working process is as follows: The fan draws ambient air (usually 20-30℃) into the air inlet of the dryer. When the ambient air flows through the heating tubes, it is heated to the set drying temperature (usually 80-120℃). Then, the heated dry air is introduced into the drying hopper, where it comes into full contact with the plastic granules to be dried. Through heat exchange, the moisture in the plastic granules is removed, forming humid and hot air with a high moisture content. Finally, the humid and hot air is directly discharged from the outside of the dryer through the exhaust pipe, completing one drying cycle.

[0004] However, the aforementioned existing dryers have significant technical defects in actual use, specifically:

[0005] 1. Serious heat waste: The temperature of the humid and hot air discharged from the drying drum is usually still 60-90℃, containing a large amount of recoverable sensible heat. However, in the existing technology, this part of the humid and hot air is directly discharged to the external environment, resulting in the heat generated during the drying process not being effectively utilized, causing serious energy waste, which does not meet the current energy conservation and consumption reduction requirements of industrial production.

[0006] 2. High energy consumption cost: The dryer draws in room temperature air at the air inlet and needs to consume a lot of electricity through the heating tube to heat it to the required drying temperature. As the heat of the humid air continues to be lost, the heating tube needs to maintain a high power operation for a long time to compensate for the heat loss, resulting in high overall energy consumption of the dryer, which significantly increases the production and operation costs of injection molding companies.

[0007] 3. Low energy efficiency: The existing dryer's "suction-heating-drying-exhaust" process is a semi-open cycle. The heat generated by the heating tube is only partially used for the evaporation of moisture from the plastic particles, and the remaining heat is lost with the exhaust of humid air. The overall energy efficiency is low and it is difficult to meet the current urgent needs of the industrial sector for energy-saving equipment. Utility Model Content

[0008] To solve the above-mentioned technical problems, this utility model provides a high-efficiency and energy-saving dryer that can recover the waste heat of humid and hot air while reducing the energy consumption of heating elements.

[0009] This utility model discloses a high-efficiency and energy-saving dryer, comprising a drying hopper and a fan. An air supply pipe is connected to the bottom side wall of the drying hopper, a discharge mechanism is connected to the bottom end of the drying hopper, and an exhaust pipe is connected to the top end of the drying hopper. A heating pipe is connected to the input end of the air supply pipe, and the input end of the heating pipe is connected to the output end of the fan via a vertical pipe. A control box is installed on the vertical pipe. The dryer also includes:

[0010] The heat exchanger mechanism is mounted on the side wall of the drying hopper by a fixing frame. The top and bottom of the circumferential side wall of the heat exchanger mechanism are respectively connected to a hot gas inlet pipe and a hot gas outlet pipe. The top and bottom of the heat exchanger mechanism are respectively connected to a discharge pipe and a suction pipe. The hot gas inlet pipe is connected to the exhaust pipe, and the discharge pipe is connected to the air inlet of the fan.

[0011] The pressure stabilizing mechanism includes an actuator, a sensing component, and a control module. The exhaust pipe is connected to the top of the drying hopper through the actuator. The sensing component is installed on the vertical pipe and is used to detect the air resistance in the exhaust pipe of the fan. The control module is installed in the control box and is used to receive the detection signal from the sensing component and to issue an action signal to the actuator.

[0012] Furthermore, the heat exchanger mechanism has an annular cavity inside, which forms a longitudinal spiral channel through a spiral plate from top to bottom. The hot gas inlet pipe and the hot gas outlet pipe are connected through the spiral channel. Several heat exchange copper tubes are evenly distributed longitudinally inside the annular cavity, and the heat exchange copper tubes pass through the spiral plate. The penetration parts of the heat exchange copper tubes and the spiral plate are tightly connected. The outlet pipe and the suction pipe are connected through the several heat exchange copper tubes. The annular cavity is separated from the outlet pipe and the suction pipe and is not connected.

[0013] Furthermore, the actuator includes an electric telescopic rod and a pressure stabilizing block. The pressure stabilizing block is installed at the top of the drying hopper, and a through hole is provided on one side of the top of the pressure stabilizing block, which connects the exhaust pipe to the drying hopper. A regulating cavity is provided inside the other side of the pressure stabilizing block, and a regulating pipe is provided on the side wall of the regulating cavity near the through hole, which is connected to the through hole. A piston column is slidably installed inside the regulating pipe, and a pressure stabilizing hole is provided at the top of the regulating pipe. A bypass pipe is installed at the top of the pressure stabilizing block, which is connected to the regulating cavity. An installation pipe is provided on the side wall of the pressure stabilizing block away from the exhaust pipe, which is connected to the regulating cavity. The electric telescopic rod is fixedly installed on the installation pipe, and the telescopic end of the electric telescopic rod slides through the installation pipe and extends into the regulating cavity. The telescopic end of the electric telescopic rod is connected to the piston column. The electric telescopic rod is powered by the dryer and is connected to the signal line of the control module.

[0014] Furthermore, the sensing component includes a differential pressure sensor, which is provided with two sampling tubes. Both sampling tubes are connected to sampling heads via flexible tubes. The two sampling heads are respectively installed on the top and middle-lower part of the vertical tube's side wall, and the sampling ends of both sampling heads are sealed and inserted into the vertical tube. The differential pressure sensor is installed on the side wall of the control box and is electrically connected to the control module to realize power supply and signal transmission.

[0015] Furthermore, the spiral plate is made of aluminum alloy or copper.

[0016] Furthermore, a dust filter cartridge is provided on the suction pipe of the heat exchanger mechanism.

[0017] Furthermore, a water collection assembly is connected to the bottom end of the hot gas outlet pipe.

[0018] Furthermore, the water collection assembly includes a water collection bottle, the top of which is connected to the bottom of a hot air outlet pipe via a connecting pipe, and a drain pipe connected to the bottom of the water collection bottle, on which a switch valve is installed.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. Achieve waste heat recovery and reuse: The heat exchanger mechanism allows the high-temperature and humid air discharged from the drying tank to exchange heat with the room-temperature air drawn in by the fan, recovering the sensible heat in the humid air and avoiding waste caused by direct heat discharge, which meets the industrial energy conservation and consumption reduction requirements.

[0021] 2. Significantly reduce energy consumption costs: The ambient temperature air is preheated before entering the heating element for heating, which reduces the heating load on the heating element. It can reach the set drying temperature without maintaining high power operation for a long time, thus reducing power consumption and reducing the production and operation costs of enterprises.

[0022] 3. Improve energy efficiency: Form a closed-loop heat exchange process of "suction-preheating-heating-drying-waste heat recovery", so that more of the heat generated by the heating tube is used for the evaporation of moisture in the plastic particles, which greatly improves the overall energy efficiency.

[0023] 4. Ensure drying stability and quality: The pressure stabilizing mechanism detects air resistance in real time through the sensing component and controls the actuator to adjust the exhaust state, avoiding pressure fluctuations in the pipeline from affecting airflow stability, ensuring that the plastic particles are in full contact with the drying air, and improving drying uniformity and product molding quality.

[0024] 5. Optimized heat exchange effect and ease of use: The design of spiral plate and corrugated heat exchange copper tube increases the heat exchange area and extends the heat exchange path, thereby improving heat exchange efficiency; the water collection component can collect condensate from hot and humid air, preventing water backflow from affecting equipment operation, and the drainage operation is convenient. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the installation structure of the differential pressure sensor of this utility model;

[0027] Figure 3 This is a schematic diagram of the installation structure of the spiral plate of this utility model;

[0028] Figure 4 This is a schematic diagram of the connection structure between the piston rod and the control tube of this utility model;

[0029] Figure 5 This is the left view of this utility model;

[0030] Figure 6 This is the utility model Figure 5 A cross-sectional view of the AA section;

[0031] The following components are labeled in the attached diagram: 1. Drying hopper; 2. Fan; 3. Air supply pipe; 4. Unloading mechanism; 5. Exhaust pipe; 6. Heating pipe; 7. Vertical pipe; 8. Control box; 9. Heat exchanger mechanism; 10. Hot air inlet pipe; 11. Hot air outlet pipe; 12. Discharge pipe; 13. Suction pipe; 14. Control module; 15. Spiral plate; 16. Heat exchange copper pipe; 17. Electric telescopic rod; 18. Pressure stabilizing block; 19. Control pipe; 20. Piston column; 21. Pressure stabilizing hole; 22. Bypass pipe; 23. Differential pressure sensor; 24. Sampling pipe; 25. Flexible hose; 26. Water collection bottle; 27. Switch valve; 28. Dust filter cartridge. Detailed Implementation

[0032] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0033] like Figures 1 to 6 As shown, this utility model discloses a high-efficiency and energy-saving dryer, including a drying hopper 1 and a fan 2. The bottom side wall of the drying hopper 1 is connected to an air supply pipe 3. A discharge mechanism 4 is connected to the bottom end of the drying hopper 1, and an exhaust pipe 5 is connected to the top end of the drying hopper 1. A heating pipe 6 is connected to the input end of the air supply pipe 3. The input end of the heating pipe 6 is connected to the output end of the fan 2 via a vertical pipe 7. A control box 8 is installed on the vertical pipe 7. The dryer also includes:

[0034] The heat exchanger mechanism 9 is mounted on the side wall of the drying hopper 1 by a fixing frame. The top and bottom of the circumferential side wall of the heat exchanger mechanism 9 are respectively connected to the hot gas inlet pipe 10 and the hot gas outlet pipe 11. The top and bottom of the heat exchanger mechanism 9 are respectively connected to the outlet pipe 12 and the suction pipe 13. The hot gas inlet pipe 10 is connected to the exhaust pipe 5, and the outlet pipe 12 is connected to the air inlet end of the fan 2.

[0035] The pressure stabilizing mechanism includes an actuator, a sensing component, and a control module 14. The exhaust pipe 5 is connected to the top of the drying hopper 1 through the actuator. The sensing component is installed on the vertical pipe 7 and is used to detect the wind resistance in the exhaust pipe of the fan 2. The control module 14 is installed in the control box 8 and is used to receive the detection signal from the sensing component and to send an action signal to the actuator.

[0036] In this embodiment,

[0037] Drying hopper 1: Contains plastic granules to be dried and provides a space for heat exchange and drying;

[0038] Fan 2: Provides power for airflow circulation, drawing in ambient temperature air and delivering it to heating pipe 6;

[0039] Air supply pipe 3: delivers heated dry air to the bottom of the drying hopper 1 to ensure that the airflow is in full contact with the particles;

[0040] Unloading mechanism 4: After drying, qualified plastic granules are discharged;

[0041] Exhaust pipe 5: Exits the hot, humid air containing moisture from the drying material hopper 1;

[0042] Heating element 6: Heats the preheated air to the set drying temperature (80-120℃);

[0043] Vertical pipe 7: connects the output end of fan 2 to the input end of heating pipe 6, and delivers the air to be heated;

[0044] Control box 8: Installs control module 14, providing protection and circuit integration carrier;

[0045] Heat exchanger mechanism 9: core waste heat recovery component, which transfers the sensible heat of humid and hot air to ambient temperature intake air through heat exchange;

[0046] Pressure stabilizing mechanism: Real-time monitoring of air resistance and adjustment of exhaust status to ensure airflow stability;

[0047] Mounting bracket: Secures heat exchanger mechanism 9, ensuring a firm installation;

[0048] Hot air inlet pipe 10 / hot air outlet pipe 11: respectively introduce and export hot and humid air in the heat exchanger;

[0049] Discharge pipe 12 / Suction pipe 13: respectively discharge and introduce ambient temperature air into the heat exchanger;

[0050] Actuator: Receives control signals to adjust the exhaust pipe diameter, thereby achieving pressure regulation;

[0051] Sensing component: detects duct air resistance data and feeds it back to control module 14;

[0052] Control module 14: Processes detection signals and issues action commands to the actuator.

[0053] As a preferred embodiment of the above embodiment, the heat exchanger mechanism 9 is provided with an annular cavity inside. The annular cavity forms a longitudinal spiral channel through a spiral plate 15 from top to bottom. The hot gas inlet pipe 10 and the hot gas outlet pipe 11 are connected through the spiral channel. A plurality of heat exchange copper tubes 16 are evenly distributed longitudinally in the annular cavity. The plurality of heat exchange copper tubes 16 penetrate the spiral plate 15 and are tightly connected to the penetration part of the spiral plate 15. The outlet pipe 12 and the suction pipe 13 are connected through the plurality of heat exchange copper tubes 16. The annular cavity is separated from the outlet pipe 12 and the suction pipe 13 and is not connected.

[0054] In this embodiment,

[0055] Annular cavity: Separates airflow channels and provides installation space for spiral plate 15 and heat exchange copper tube 16;

[0056] Spiral plate 15: forms a longitudinal spiral channel, prolongs the residence time of hot and humid air, and improves heat transfer efficiency;

[0057] Spiral channel: guides the orderly flow of hot and humid air, ensuring full contact with the heat exchange copper tube 16;

[0058] Heat exchange copper tube 16: It passes through the spiral plate 15 and is tightly connected to it, serving as a heat conduction carrier to transfer heat from the humid air to the room temperature air;

[0059] The annular cavity is separated from the discharge pipe 12 and the suction pipe 13 to avoid cross-contamination of the gas path and ensure the heat exchange effect.

[0060] In a preferred embodiment, the actuator includes an electric telescopic rod 17 and a pressure stabilizing block 18. The pressure stabilizing block 18 is installed at the top of the drying hopper 1, and a through hole is provided on one side of the top of the pressure stabilizing block 18, which connects the exhaust pipe 5 to the drying hopper 1. A regulating cavity is provided inside the other side of the pressure stabilizing block 18, and a regulating pipe 19 is provided on the side wall of the regulating cavity near the through hole. The regulating pipe 19 is connected to the through hole, and a piston rod 20 is slidably installed inside the regulating pipe 19. The top of the regulating pipe 19 is provided with a through hole. There is a pressure stabilizing hole 21. A bypass pipe 22 is installed on the top of the pressure stabilizing block 18. The bypass pipe 22 is connected to the control cavity. An installation pipe is provided on the side wall of the pressure stabilizing block 18 away from the exhaust pipe 5, which is connected to the control cavity. The electric telescopic rod 17 is fixedly installed on the installation pipe. The telescopic end of the electric telescopic rod 17 slides through the installation pipe and extends into the control cavity. The telescopic end of the electric telescopic rod 17 is connected to the piston column 20. The electric telescopic rod 17 is powered by the dryer and is connected to the signal line of the control module 14.

[0061] In this embodiment,

[0062] Electric telescopic rod 17: Actuating power unit that drives the piston rod 20 to extend and retract according to the control signal;

[0063] Pressure stabilizer 18: integrates through holes, regulating cavities and other structures to enable component installation and gas path connection;

[0064] Through hole: connects exhaust pipe 5 to drying material hopper 1, providing a channel for the discharge of hot and humid air;

[0065] Control chamber: accommodates piston rod 20 and is connected to bypass pipe 22, providing pressure regulation space;

[0066] Control tube 19: connects the control cavity and the through hole, providing a sliding track for the piston rod 20;

[0067] Piston column 20: It slides in a sealed manner within the control tube 19, and the exhaust pipe diameter is adjusted by its position movement;

[0068] Pressure stabilizing hole 21: assists in balancing the pressure inside the regulating tube 19 to avoid sudden pressure changes;

[0069] Bypass pipe 22: Depressurizes when pressure is too high to ensure safe operation of equipment;

[0070] Installation tube: Fix the electric telescopic rod 17, ensuring that the telescopic end is sealed and extends into the control cavity.

[0071] As a preferred embodiment of the above embodiment, the sensing component includes a differential pressure sensor 23, which is provided with two sampling tubes 24. Each sampling tube 24 is connected to a sampling head through a flexible tube 25. The two sampling heads are respectively installed on the top and middle-lower side walls of the vertical tube 7, and the sampling ends of the two sampling heads are sealed and inserted into the interior of the vertical tube 7. The differential pressure sensor 23 is installed on the side wall of the control box 8, and the differential pressure sensor 23 is electrically connected to the control module 14 to realize power supply and signal transmission.

[0072] In this embodiment,

[0073] Differential pressure sensor 23: The core detection component, which calculates the pressure difference between the two sampling heads to reflect wind resistance;

[0074] Sampling tube 24: connects differential pressure sensor 23 and hose 25 to transmit pressure signals;

[0075] Hose 25: Adapts to different installation locations and allows for flexible transmission of pressure signals;

[0076] Sampling head: Seal and insert into vertical tube 7 to collect gas pressure data at different locations.

[0077] As a preferred embodiment of the above, the spiral plate 15 is made of aluminum alloy or copper.

[0078] In this embodiment,

[0079] Aluminum alloy / copper spiral plate 15: Utilizing the excellent thermal conductivity of the two materials, the heat exchange efficiency is improved. The material can be selected as needed according to actual requirements and production cost requirements. The two materials mentioned above are preferred, but not limited to the two materials mentioned above. Any material that meets the requirements of the technical solution of this utility model can be selected.

[0080] As a preferred embodiment of the above embodiment, a dust filter cartridge 28 is provided on the suction pipe 13 of the heat exchanger mechanism 9;

[0081] In this embodiment,

[0082] Dust filter cartridge 28: Dust filter cartridge 28 greatly reduces the probability of dust from the external environment being drawn into the heat exchanger mechanism and the drying cylinder, avoids dust accumulation inside the heat exchange copper tube, protects the fan, and ensures the purity of the material.

[0083] As a preferred embodiment of the above, a water collection assembly is connected to the bottom end of the hot gas outlet pipe 11;

[0084] In this embodiment,

[0085] Water collection assembly: collects the condensate formed after the hot and humid air is cooled by the heat exchanger, preventing water backflow from affecting the equipment or drying effect.

[0086] As a preferred embodiment of the above, the water collection assembly includes a water collection bottle 26, the top of which is connected to the bottom of the hot air outlet pipe 11 via a connecting pipe, and the bottom of the water collection bottle 26 is connected to a drain pipe, on which a switch valve 27 is connected and installed.

[0087] In this embodiment,

[0088] Water collection bottle 26: Stores condensate to prevent water from overflowing;

[0089] Connecting pipe: guides the condensate in the hot gas outlet pipe 11 into the water collection bottle 26;

[0090] Drain pipe: Provides a drainage channel for condensate in water collection bottle 26;

[0091] Switch valve 27: controls the opening and closing of the drain pipe, allowing users to drain water as needed.

[0092] The working principle of this utility model is as follows:

[0093] After the fan 2 starts, it draws in ambient temperature air, which enters the heat exchange copper tube 16 through the suction pipe 13 of the heat exchanger mechanism 9. Simultaneously, the high-temperature, humid air (60-90℃) in the drying hopper 1, after heat exchange with the plastic granules, enters the spiral channel of the heat exchanger through the exhaust pipe 5 and the hot air inlet pipe 10. Through conduction by the spiral plate 15 and contact with the copper tube wall, the sensible heat of the humid air is transferred to the ambient temperature air inside the copper tube, achieving preheating of the intake air. The preheated air enters the fan 2 through the discharge pipe 12, and then is conveyed to the heating tube 6 through the vertical pipe 7 to be heated to the set drying temperature. Subsequently, it is introduced into the bottom of the drying hopper 1 through the air supply pipe 3, flowing upwards and fully contacting the plastic granules, carrying away moisture to form humid air.

[0094] In the pressure stabilizing mechanism, differential pressure sensor 23 collects pressure at different positions on the vertical pipe 7 through two sampling heads, calculates the wind resistance, and feeds it back to control module 14. If the wind resistance is abnormal, control module 14 drives electric telescopic rod 17 to extend or retract, causing piston column 20 to slide and adjust the diameter of regulating pipe 19, which, in conjunction with pressure stabilizing hole 21 and bypass pipe 22, stabilizes the pipeline pressure. After the humid and hot air is heated by the heat exchanger, its temperature decreases, and condensate flows into water collection bottle 26 through hot air outlet pipe 11, which can be discharged through drain pipe controlled by switch valve 27. The entire process forms a closed-loop heat exchange, realizing waste heat recovery, low-energy heating, and stable drying, significantly improving energy utilization and drying quality.

[0095] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-efficiency energy-saving dryer, comprising a drying hopper (1) and a fan (2), wherein the bottom side wall of the drying hopper (1) is connected to an air supply pipe (3), the bottom end of the drying hopper (1) is connected to a discharge mechanism (4), the top end of the drying hopper (1) is connected to an exhaust pipe (5), the input end of the air supply pipe (3) is connected to a heating pipe (6), the input end of the heating pipe (6) is connected to the output end of the fan (2) through a vertical pipe (7), and a control box (8) is installed on the vertical pipe (7), characterized in that, Also includes: The heat exchanger mechanism (9) is mounted on the side wall of the drying barrel (1) by a fixing frame. The top and bottom of the circumferential side wall of the heat exchanger mechanism (9) are respectively connected to the hot gas inlet pipe (10) and the hot gas outlet pipe (11). The top and bottom of the heat exchanger mechanism (9) are respectively connected to the discharge pipe (12) and the suction pipe (13). The hot gas inlet pipe (10) is connected to the exhaust pipe (5), and the discharge pipe (12) is connected to the air inlet of the fan (2). The pressure stabilizing mechanism includes an actuator, a sensing component, and a control module (14). The exhaust pipe (5) is connected to the top of the drying hopper (1) through the actuator. The sensing component is installed on the vertical pipe (7) and is used to detect the wind resistance in the exhaust pipe of the fan (2). The control module (14) is installed in the control box (8) and is used to receive the detection signal from the sensing component and to issue an action signal to the actuator.

2. The high-efficiency energy-saving dryer as described in claim 1, characterized in that, The heat exchanger mechanism (9) has an annular cavity inside. The annular cavity forms a longitudinal spiral channel through a spiral plate (15) from top to bottom. The hot gas inlet pipe (10) and the hot gas outlet pipe (11) are connected through the spiral channel. Several heat exchange copper tubes (16) are evenly distributed longitudinally in the annular cavity. The heat exchange copper tubes (16) penetrate the spiral plate (15) and are tightly connected to the penetration part of the spiral plate (15). The outlet pipe (12) and the suction pipe (13) are connected through several heat exchange copper tubes (16). The annular cavity is separated from the outlet pipe (12) and the suction pipe (13) and is not connected.

3. The high-efficiency energy-saving dryer as described in claim 1, characterized in that, The actuator includes an electric telescopic rod (17) and a pressure stabilizing block (18). The pressure stabilizing block (18) is installed at the top of the drying hopper (1), and a through hole is provided on one side of the top of the pressure stabilizing block (18), which connects the exhaust pipe (5) to the drying hopper (1). A regulating chamber is provided inside the other side of the pressure stabilizing block (18), and a regulating pipe (19) is provided on the side wall of the regulating chamber near the through hole. The regulating pipe (19) is connected to the through hole, and a piston column (20) is slidably installed inside the regulating pipe (19). A pressure stabilizing hole (2) is provided at the top of the regulating pipe (19). 1) A bypass pipe (22) is installed at the top of the pressure stabilizing block (18). The bypass pipe (22) is connected to the control cavity. An installation pipe connected to the control cavity is provided on the side wall of the pressure stabilizing block (18) away from the exhaust pipe (5). The electric telescopic rod (17) is fixedly installed on the installation pipe. The telescopic end of the electric telescopic rod (17) slides through the installation pipe and extends into the control cavity. The telescopic end of the electric telescopic rod (17) is connected to the piston column (20). The electric telescopic rod (17) is powered by the dryer. The electric telescopic rod (17) is connected to the signal line of the control module (14).

4. The high-efficiency energy-saving dryer as described in claim 1, characterized in that, The sensing component includes a differential pressure sensor (23), which is provided with two sampling tubes (24). Both sampling tubes (24) are connected to sampling heads through flexible tubes (25). The two sampling heads are respectively installed on the top and middle-lower side walls of the vertical tube (7), and the sampling ends of the two sampling heads are sealed and inserted into the vertical tube (7). The differential pressure sensor (23) is installed on the side wall of the control box (8), and the differential pressure sensor (23) is electrically connected to the control module (14) to realize power supply and signal transmission.

5. The high-efficiency energy-saving dryer as described in claim 2, characterized in that, The spiral plate (15) is made of aluminum alloy or copper.

6. The high-efficiency energy-saving dryer as described in claim 2, characterized in that, A dust filter cartridge (28) is provided on the suction pipe (13) of the heat exchanger mechanism (9).

7. The high-efficiency energy-saving dryer as described in claim 1, characterized in that, The bottom end of the hot gas outlet pipe (11) is connected to a water collection assembly.

8. The high-efficiency energy-saving dryer as described in claim 7, characterized in that, The water collection assembly includes a water collection bottle (26), the top of which is connected to the bottom of a hot air outlet pipe (11) via a connecting pipe, and a drain pipe is connected to the bottom of the water collection bottle (26), on which a switch valve (27) is installed.

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