Intelligent temperature regulator (see below) have over-temperature protection function. If the temperature inside the working chamber exceeds the set temperature value during the working process of the equipment, the over-temperature protection circuit will be activated and the heating circuit will be cut off.
The electric vacuum drying oven can keep a certain degree of vacuum in the working chamber and adopt intelligent digital temperature regulator to set, display and control the temperature. The temperature regulator adopts computer technology to collect and process the temperature signal in the working chamber, which can make the temperature in the working chamber keep constant temperature automatically. The temperature control system is P.I.D intelligent temperature control, reliable performance, easy to use.
Vacuum drying oven working principle
Selection of vacuum pump
Advantages of vacuum technology dryingNote: 1, the table value is derived under the following conditions: ① water temperature 15 ℃: ② air 20 ℃: ③ gas relative humidity 70% ④ atmospheric pressure 0.1013MPa. 2, pumping volume deviation is not more than ± 10%
The following advantages compared with conventional drying The vacuum environment greatly reduces the boiling point of the liquid to be removed, so the vacuum drying can be easily applied to heat-sensitive materials;
◆ For the samples which are not easy to be dried, such as powder or other granular samples, the drying time can be effectively shortened by using the vacuum drying method;
◆ All kinds of complicated mechanical parts or other porous samples can be dried by using the vacuum drying method after cleaning.
The samples are cleaned by the vacuum drying method. Samples are cleaned and then dried in vacuum, leaving no residue after complete drying;
◆Safer to use ---- under vacuum or inert conditions, completely eliminating the possibility of explosion of oxides in the presence of heat;
◆Compared with ordinary drying relying on air circulation, powdered samples will not be blown by the flow of air or movement;
Control features: with a blackout, dead state data loss protection, and the control of the system. The parameter memory of protection due to power failure, loss of data in dead state, and recovery function of incoming call.
Performance features:
■Streamline arc type design, the shell is made of cold rolled steel, surface electrostatic spraying;
■The machine temperature control system using microcomputer single-chip technology, temperature control, timing, over-temperature alarm;
■Display for the dual-screen high-brightness digital display, the value of the accurate and intuitive, superior performance, touch keys to set the parameters;
■Display for the dual-screen high-brightness digital display, accurate intuitive performance, touch key set Adjustment parameters;
■Temperature control sensors are capacitive original imported components;
■The use of imported motors and air blades; with timing and timing function;
■Inner are made of stainless steel; semi-circular corners are easy to clean;
■The machine box door completely tight can be adjusted by the user at will, the overall formation of the silicone rubber door sealing ring to ensure that the box High vacuum;
■The machine studio for the rectangular structure, so that the effective volume to reach the maximum, the door of the box using toughened, bullet-proof double glass door, so that the observation of the studio cultivation of goods can let the user at a glance;
Vacuum drying box use
Use of the environmental requirements:
a) Temperature: 5 ~ 40 ℃
b) Relative humidity: ≤85%RH
c)Power supply voltage: AC220V±10% 50Hz
d)No strong vibration and corrosive gas influence in the surrounding area
Vacuum debugging:
a)Close the door of the box and tighten the door puller in place, close the bleeder valve (so that the holes on the rubber stopper are twisted away from the holes on the bleeder valve by 90 °), and open the vacuum valve (rotated 90° counterclockwise). Counterclockwise rotation 90 °), the first time you use may be the vacuum valve switch is tighter, you can force to rotate.
b)Connect the vacuum pumping pipe (outer diameter: Φ16mm) and vacuum pump (2XZ-2 type, inlet O.D. Φ16mm) with the vacuum connecting pipe (inner diameter: Φ16mm, wall thickness: 10mm) of the random accessory (6090 and 6210 types are already connected). Turn on the vacuum pump power supply, start pumping, when the vacuum gauge indication value reaches -0.1Mpa, close the vacuum valve first and then turn off the vacuum pump power supply to prevent the vacuum pump oil backflow into the working chamber, (6090 and 6210 type no vacuum valve, can be directly turned off on the panel of the vacuum pump power supply) at this time the box is in a vacuum state.
Vacuum box debugging:
After the vacuum debugging is completed, the following operations can be done:
a. Turn on the vacuum box power supply, this time, the power indicator should be bright (6090 and 6210 should be turned on the thermostat switch) thermostat power self-check, PV screen shows the measured temperature inside the working chamber, SV screen shows the temperature set at the time of factory. Temperature control instrument on the AT and HEAT and other lights should be bright, indicating that the instrument into the heating of the working state.
b. Modify the set temperature
1. Press the function key (SET) of the temperature control instrument; PV screen displays the SP characters, the key head button for the set temperature modification (6090 and 6210 type of 2 and 3 instruments should be set to modify the following similar).
2. After the modification is completed, press the SET button again, the PV screen displays ST characters, set the timing time.
If you don't want to use the timer function, you can still make it ST=0
3. Press the SET key again, so that the PV screen displays the temperature of the studio, and the SV screen displays the new set temperature. Instrument AT and HEAT lights on, this time the instrument re-enter the heating state of operation.
c. When the studio temperature is close to the set temperature, the HEAT lamp flashes on and off, indicating that the heating into the PID regulation stage, the instrument sometimes measures the temperature exceeds the set temperature, and sometimes lower than the set temperature is a normal phenomenon. When the measured temperature is close to or equal to the set temperature, and then wait 1~2h after the studio into the constant temperature state, the goods into the drying stage.
d. Required temperature is lower, the second setting can be used, such as the required working temperature of 70 ℃, the first time the first set 60 ℃, such as the temperature overshoot began to fall back, and then the second setting of 70 ℃, so that can reduce or even eliminate the phenomenon of overshooting the temperature as soon as possible to enter the state of constant temperature.
e. When the items are dry, turn off the power, if the accelerated cooling, open the bleeder valve so that the vacuum is 0, to be about 5 minutes and then open the door.
4. If the humidity of the drying material in the working chamber is large, the moisture generated will affect the performance of the vacuum pump, it is recommended to string a "drying/filter" between the drying box and the vacuum pump.
5. If it is necessary to add nitrogen and other inert gases in the process of drying articles, it should be specified in the contract and equipped with an additional air inlet valve.
(Note:
1. If the vacuum pump is normal and meets the technical requirements, can not vacuum, then open the door to use the product accessories in the board hand will be the box on the door buckle screwed inward a circle to shorten, and then close the door again.
2. This vacuum drying oven can not be used as an electric drying oven, because the studio is not in a vacuum state, the measured temperature and the actual temperature in the working room is a huge error)
Precautions for use
1. The vacuum box shell must be effectively grounded to ensure the safety of use.
2. The vacuum box should be used in an environment where the relative humidity is ≤85%RH, there is no corrosive gas in the surrounding area, and there is no strong vibration source or strong electromagnetic field.
3. Vacuum box studio without explosion-proof, anti-corrosion treatment, shall not put flammable, explosive, easy to produce corrosive gases for drying.
4. The vacuum pump can not work for a long time, so when the vacuum degree reaches the requirement of drying goods, the vacuum valve should be closed first, and then turn off the power supply of the vacuum pump, when the vacuum degree is less than the requirement of drying goods, then open the vacuum valve and the power supply of the vacuum pump and continue to pump the vacuum, so as to prolong the service life of the vacuum pump.
5. If the dry goods are wet, it is better to add a filter between the vacuum box and the vacuum pump to prevent the wet gas from entering the vacuum pump and causing the vacuum pump failure.
6. If the dry goods are changed to light weight and small volume (small granular) after drying, the vacuum port in the working chamber should be equipped with a barrier net to prevent the dry goods from being sucked in and damaging the vacuum pump (or solenoid valve).
7. Vacuum box after repeated use, will produce the phenomenon of vacuum can not be vacuum, at this time should replace the door seal or adjust the box on the door buckle to extend the distance to solve the problem. When the vacuum box drying temperature is higher than 200 ℃, will produce slow leakage phenomenon (in addition to 6050, 6050B, 6051, 6053), this time to remove the box back cover plate with an allen wrench to loosen the heater base, replace the seal or tighten the heater base to solve.
8. Bleeder valve rubber plug if rotating difficult, can be coated with an appropriate amount of grease lubrication. (Such as petroleum jelly)
9. In addition to maintenance, can not be removed from the left side of the box cover (except 6090 and 6210 type) to avoid damage to the electrical control system.
10. Vacuum box should always keep clean. Box door glass should not be wiped with a reactive chemical solution, should be wiped with a soft cotton cloth.
11. If the vacuum box is not used for a long time, will be exposed to the outside of the plating parts after wiping coated with neutral grease, in order to prevent corrosion, and set on the plastic film dust cover, placed in a dry room, so as to avoid moisture damage to the electrical components, affecting the use.
12. Vacuum box does not require continuous pumping use, you should first close the vacuum valve, and then turn off the vacuum pump power, otherwise the vacuum pump oil to be backed up to the box.
Vacuum pump maintenance and maintenance
Vacuum oven vacuum pump-maintenance
1, often check the oil level position, does not comply with the provisions of the adjustment must be made to meet the requirements. When the vacuum pump is running, the oil level to the center of the oil mark shall prevail.
2, often check the oil quality, found that the oil deterioration should be replaced in time with new oil to ensure that the vacuum pump works properly.
3, the oil change period according to the actual conditions of use and can meet the performance requirements and other considerations, at the discretion of the user. Generally new vacuum pump, pumping clean and dry gas, it is recommended to change oil once in about 100 hours of work. To be oil can not be seen in the black metal powder, and then can be appropriate to extend the period of oil change.
4, in general, the vacuum pump should be overhauled after 2000 hours of work, check the aging degree of JiaoJiao rubber seals, check whether the exhaust valve piece is cracked, clean up the dirt deposited on the valve piece and exhaust valve seat. Clean the whole vacuum pump cavity parts, such as rotor, rotary vane, spring and so on. Generally use gasoline to clean and dry. For rubber parts class cleaning and drying with a dry cloth can be. Cleaning and assembly should be gently held and put carefully bruised.
5, the same conditions of the tube to clean up, to ensure that the pipeline is smooth.
6, reassembly should be carried out after the test run, generally must be idling for 2 hours and the second oil change, because of cleaning in the vacuum pump will remain a certain amount of volatile substances, to be normal operation, and then put into normal operation.
7, check the vacuum pump pipeline and the combination of loose phenomenon. Rotate the vacuum pump by hand and try to see whether the vacuum pump is flexible.
8, to the bearing body to add bearing lubricating oil, observe the oil level should be in the center line of the oil mark, lubricating oil should be replaced or supplemented in time.
9, unscrew the vacuum pump pump body of the water-inducing screw plug, filling water-inducing (or slurry).
10, close the gate valve of the outlet pipe and the outlet pressure gauge and the inlet vacuum gauge.
11, point the motor, try to see whether the motor steering is correct.
12, start the motor, when the vacuum pump is running normally, open the export pressure gauge and the import vacuum pump, depending on its display of the appropriate pressure, gradually open the gate valve, while checking the motor load.
13, try to control the flow and head of the vacuum pump in the range indicated on the label to ensure that the vacuum pump is running at the highest efficiency point in order to get the maximum energy-saving effect.
14. During the operation of the vacuum pump, the bearing temperature should not exceed 35C of the ambient temperature, and the maximum temperature should not exceed 80C.
15. If you find abnormal sound of the vacuum pump, you should stop the pump immediately to check the reason.
16. When the vacuum pump is to be stopped, close the gate valve and pressure gauge first, and then stop the motor.
17, vacuum pump in the work of the first month, after 100 hours to replace the lubricating oil, and then each 500 hours, an oil change.
18, often adjust the packing gland, to ensure that the packing chamber of the drip situation is normal (in order to become a drip leakage is appropriate).
19, regularly check the wear of the sleeve, wear and tear should be replaced.
20, vacuum pump in the winter season when using, after parking, the pump body lower drain screw unscrew the medium to put clean. Prevent freezing and cracking.
21. When the vacuum pump is out of service for a long time, the pump should be disassembled, dried, and the rotating parts and the joints should be coated with grease and properly stored.