Pulse vacuum oven - independently developed by Nanjing Maidie Electric Heating Equipment Co., Ltd. 025-85717404. It is mainly used in large vacuum drying rooms with obvious effects.
Business License 1 Business License 2
Comply with GMP standards 1. Pulse vacuum oven is suitable for drying heat-sensitive materials in medicine, food, chemical industry, electronics, traditional Chinese medicine and other industries. 2. Pulse vacuum oven: Pure water has the maximum vaporization speed when it is boiling. Under normal pressure, pure water begins to boil at about 100°C. Under vacuum conditions, since the partial pressure of water vapor in the system is much lower than the partial pressure of water vapor on the surface of the material, the boiling point of water is lower than 100°C. For example: when the surface drops to -0.07Mpa, water begins to boil at 70°C. As a general rule, the higher the vacuum, the lower the boiling point of water. In the vacuum dryer, the vaporized water can be quickly discharged with the vacuum generation system, so even at a lower operating temperature, this dryer still has a large drying capacity. When the equipment is running, the material is in a static state, which is conducive to maintaining the initial state of the material. Intermittent operation allows the process conditions to be adjusted at any time. This equipment is all manually loaded and unloaded. , the top and bottom are arranged in an arched structure, which can effectively overcome the problems of condensed water dripping back and rapid flow of water at the bottom before centralized treatment, further improving the drying efficiency, and integrating the company's exclusive design with a two-point-in-one pulse pumping system. The vacuum structure effectively and quickly evacuates the evaporated water in the working room. The drying time is only 2/3 of that of ordinary vacuum ovens. Advantages of the pulse pumping structure: 1. The pulse vacuum oven can dry materials at one time without changing the materials up and down. After the top layer of materials in an ordinary vacuum oven is dried, the moisture content of the bottom layer of materials is not dried and cannot meet GMP production standards. Ordinary vacuum oven operators must constantly exchange the upper and lower materials during the drying process in order to dry in a timely manner. Advantage 2. The workload of pulse vacuum oven operators is small, while the workload of ordinary vacuum oven workers is relatively large, the operation is cumbersome, and the drying effect is difficult to control (the moisture content of the upper and lower materials after drying is not difficult to control, and GMP production cannot be obtained) The standard is that the moisture content of the products dried in an oven cannot be consistent). Advantage 3. The condensation water of the pulse pumping structure can quickly and effectively drain the water evaporated from the materials in the working room through the unique structure of the box. However, the condensation water of ordinary ovens can only stay at the bottom of the drying body when the door is opened, and part of the water can escape from the door of the box. outflow. Advantage 4. The pulse vacuum oven adopts program control, which can regularly and quantitatively compensate for fresh air to quickly and effectively drain out the evaporated water to obtain the drying effect. The drying time is 1/3 longer than that of ordinary vacuum ovens (for example, the drying time of ordinary vacuum ovens is 12 hours, and the pulse vacuum oven can dry in only 8 hours. The workload of 3 ordinary vacuum ovens can be completed, while the pulse vacuum oven can dry It can be completed with only 2 units. The production cost is small and the operator workload is also small.) 3. Features of pulse vacuum oven: 1. It can achieve higher drying rate at lower temperature and fully utilize the heat. 2. Suitable for low-temperature drying or drying of heat-sensitive materials. 3. It can dry materials containing solvents and materials that need to be recovered. 4. Disinfection can be carried out before drying, and no impurities will be mixed during the drying process. 5. This dryer is a static vacuum dryer, so the shape of the dried material will not be damaged.
4. Main technical parameters of pulse vacuum oven: 1. Working dimensions of the box: Width 1400 × Depth 1500 × Height 1400mm External dimensions: Width 1650 × Depth 1700 × Height 1800mm 2. Number of drying trays: 60 Drying tray dimensions: 640 ×460×45mm Loading capacity: 180-200KG/box 3. Empty box heating time: 30-45min 4. Rated temperature: 35-90℃ (adjustable) 5. Process temperature: 35-80℃ 6. Box temperature uniformity : ±5℃ 7. Layer distance 120mm 8. Heating method hot water 9. Temperature control area: 1 o'clock 10. Material placement: manual 11. Power supply parameters ~380V N (three-phase four-wire system) 12. Vacuum degree 0.068- 0.098Mpa13, weight 4550kg 5. Main configuration of pulse vacuum oven 1. The outer cover of the box is 304-2B, the thickness is 1.5mm Zhang Pu 2. The inner cover of the box is 304-2B, the thickness is 8.0mm Zhang Pu 3. The heat insulation layer is reinforced No. 8 channel steel WISCO 4. Steam main pipe 304-2B φ45×3 Guangdong reinforced pipe 304-2B φ32×3 Guangdong layered pipe 304-2B φ22×3 Guangdong 5. Insulation material Aluminum silicate fiber cotton Zhenjiang Insulation Material Factory 6. Sealing material edible silicone rubber 7. 2 sight glasses from Wuxi 8. 1 vacuum gauge from Nanjing 9. 1 pressure gauge from Shanghai 10. Door hinges and door compression are homemade 11. Inner tank
The arc transition is used to facilitate cleaning. 6. Control part 1. 1 smart instrument from Shanghai 2. Thermoelectric group Pt 100 1 pc/Taiwan Yatai 3. AC contactor 10A 1 Siemens 4. 1 set of switching components from Siemens 5. Control cabinet 1. 7. Structural characteristics and performance of pulse vacuum oven equipment: Mainly composed of box body (inner tank, reinforced plate, outer wall, insulation layer, platinum resistance), door mechanism, heating device, loading device, vacuum dehumidification device , temperature control system and other components. Box: The box is mainly composed of inner tank, reinforcement ribs, outer wall, insulation layer, platinum resistor, etc. 1.1 Inner tank: It is made of S8.0 SUS304 stainless steel plate and is densely welded on both sides to ensure sufficient strength and rigidity without deformation under vacuum. Specially reinforced with 10# national standard channel steel. (If you can see welding marks in the liner, it is made of real materials. If you don’t see welding marks in the liner, it is inner jacketed.) 1.2 Reinforcing ribs: Use 10# national standard channel steel with a square shape of 220*220mm. The grid shape is strengthened, and the welding method adopts cross symmetry welding. Ensure that the inner bladder and stiffeners are evenly stressed under vacuum. 1.3 Outer wall: assembled and welded from S1.5 SUS304 stainless steel plates. 1.4 Insulation layer: The laying method is to use aluminum silicate insulation cotton sandwiched between the inner tank and the reinforcement. The fiber with a bulk density of 80g is used as thermal insulation cotton, which has good thermal insulation effect and good energy-saving performance. It is the first product of our factory's thermal insulation materials. 1.5 Platinum resistance: using PT100 (-50~320 degrees) platinum resistance 2. Door mechanism: 2.1 Door: inner tank S8.0 SUS304 stainless steel, outer shell made of 1.5mm SUS304 stainless steel plate bent and densely welded, filled with silicic acid in the middle Aluminum fiber wool. The seal between the box door and the box body is operated by a spiral pressure rod handle to compress the seal, and a mushroom-type special sealing strip is used, which is fixed in the sealing groove on the edge of the box body door. 2.2 Door structure: Single opening type, manually opened. The door hinge uses flat bearings to support rotation, making it easy and effortless to open the door. The method of fixing the lining board and fiber cotton of the box door is the same as that of the box body. 3. Heating device: According to the structure and use process of the equipment, SUS304 stainless steel coil is used as the heating element. 4. Loading device: After manual loading, the drying tray is placed on the drying rack in the oven for drying. 5. Vacuum dehumidification device: It is mainly composed of vacuum pump, buffer tank, one-way valve, vacuum electrode point, and vacuum pulse system. The vacuum pump adopts SK-6 11kw water circulation vacuum pump. The water circulation vacuum pump is the main vacuum pump. The buffer tank is used to separate materials and water when the vacuum oven is evacuated. The one-way valve is mainly used to prevent the water in the buffer tank from flowing back when the vacuum pump is turned off when the vacuum reaches a certain degree of vacuum. The vacuum electrode point controls the vacuum degree and works automatically within a certain range. The vacuum pulse system is mainly composed of solenoid valve and one-way valve. The vacuum pulse system mainly uses the filter to compensate for fresh air in the oven, thereby improving the speed of evaporating water in the oven and pumping it out by the vacuum pump. The drying speed is increased to 15-30.6 times compared with ordinary ovens. Temperature control system: 6.1 The oven is controlled in 1 zone. The PID control circuit is adopted, and the AC contactor is used as the actuator. Temperature control instruments, temperature sensors, AC contactors, and solenoid valves constitute the circulation heating control of the temperature heating system. 6.2 The heating area is equipped with a multi-point intelligent temperature control instrument. The temperature control instrument can set the temperature in the box to increase the temperature and control the heat preservation program according to the process requirements. This temperature control system can fully ensure accurate temperature control within the vacuum oven box during operation, eliminate thermal inertia, reduce temperature differences, and ensure temperature uniformity within the box.
Main control components such as AC contactors, fast fuses, intermediate relays, circuit breakers, time relays, operating switches, buttons, and audible and visual alarm lights are all Siemens products. Sensitive, accurate, reliable and long life. 8. Explanation of the key technologies of pulse vacuum oven and the measures to be taken 1. This vacuum oven is a large-scale vacuum equipment. The key technologies are: 1) How to ensure the temperature uniformity requirements in the uniform temperature zone during the heat preservation process. 2) Reliability of the cabinet vacuum dehumidification circulation system 3) Reliability of the temperature control system 2. Take measures; 1) Using PIC control, temperature control data can be automatically calculated. 2) The exclusive design adopts a two-point pulse vacuuming structure. 3) Adopt multi-point PID control circuit, with AC contactor as the actuator. Temperature control instruments, temperature sensors, and AC contactors constitute the circulation heating control of the temperature heating system.