Oil-free scroll pump

Oil-free scroll pump is a new generation of oil-free vacuum pump. It has a high compression ratio, a stable pumping speed in a wide pressure range, and its performance has reached the international advanced level, replacing the expensive foreign products of the same kind. It will not pollute the vacuum chamber, nor cause environmental pollution around the pump body. It can also operate continuously near the atmospheric pressure. The operation is very simple. It is the preferred model to achieve green vacuum, energy saving and emission reduction. It is widely used in molecular pump connection, medical instruments, electronics, semiconductor, medicine, vacuum packaging, solar energy, vacuum drying and filtering, scientific research, analytical instruments, vacuum fixing, gas degassing, vacuum forming, leakage detection, accelerator, sputtering device, recovery device, etc.

Oil-free scroll pump working principle：

Oil-free scroll pump is composed of two involute spiral curve discs, namely a static scroll disc and a moving scroll disc. When the moving scroll is installed eccentrically, the static scroll and the moving scroll form a lunar bud cavity. With the rotating scroll, the lunar bud-shaped cavity continuously rotates and compresses inward, and finally discharges from the middle to the outlet. The rotating scroll disc runs continuously, and the gas is continuously inhaled and compressed from the intake port, and discharged from the outlet to form a vacuum.

Oil-free scroll pump Installation：

1. Inspection of products

1) Check whether the packing box is facing up and open it.

2) Check whether the product model is the one you ordered.

3) Inspection is not damaged. In case of damage, claim shall be lodged with the carrier company.

4) Remove entrance and exit clamps.

5) Check the packing list in the plastic bags of the products, whether the name and quantity of the products are fully packed.

2. Working environment

1) Hazard of electric shock. Pumps should be installed in areas where they are not exposed to damp conditions, such as rain or steam. The moisture on the power adapter may cause short circuit and personal injury or shock.

2) There is danger of explosion and fire. Installation areas should not be exposed to explosive, flammable gases or other related hazards. Otherwise, the pump may cause explosion or fire.

3) Operate at ambient temperatures of 5-40 C. If operating beyond this ambient temperature range, it may cause fire, damage or malfunction.

4) Ensure proper ventilation. Install the equipment in a well ventilated area. Because the scroll pump is air-cooled by poor ventilation may cause abnormal overheating, fire or failure.

5) Pump should be installed in proper place. Installation areas should be kept free from dust or corrosive gases. Failure to install the pump in the right place may cause damage or malfunction. The area where the pump is installed shall not be exposed to debris such as iron, gravel, abrasive or wood dust. In the installation area, the pump should not be directly exposed to sunlight. Direct sunlight exposure may cause high temperature and malfunction.

3. Installation of Pumps

The pump is equipped with lifting ring bolts for transportation. Lifting equipment with sufficient carrying capacity should be used. When the pump is lifted and moved, never stand under the suspended pump. Pump should be installed on solid horizontal ground (slope less than 5 degrees). Installation is not stable and may cause failure. If the ground is unstable, the following methods should be adopted to fix the pump: using the 10*8 mm hole on the bottom foot of the pump to fix.

4. Electrical Connection

Electrical connections must be made by qualified electricians. Otherwise, electric shock or fire may occur. Before connecting the pump, disconnect the input power supply. Failure to do so may result in electric shock injury. Before wiring, power supply and voltage should be checked. Three-phase motor can use two kinds of voltage: 380V 50HZ; 440V 60HZ.

Connection between Oil-free scroll pump and Vacuum System：

1. The inlet (flange) of the pump is KF40, and the outlet (flange) is KF25.

2. Generally, the inlet of the pump is directly connected with the vacuum chamber, but the premise is clean gas.

3. If there are debris, water vapor, dust and so on, it is suggested to use the following figure to connect.

4. Install the isolation valve between the vacuum chamber and the inlet of the pump to prevent debris from being pumped back into the vacuum chamber when starting or stopping.

5. We recommend the use of automatic valves as isolation valves, which close when the power supply fails to prevent debris from being pumped back into the vacuum chamber from the inside of the pump.

6. Install an inflatable valve between the isolation valve and the inlet of the pump. Open the inflatable valve during the operation of the system to remove dirt and water vapor in the pump.

7. Clean connecting pipes should be used between the vacuum chamber and the vacuum pump. We recommend that hoses be used between the inlet of the pump and the vacuum chamber so that the vibration of the pump does not propagate to the vacuum chamber.

8. Ensure that the exhaust pipe is not blocked during operation.

9. Ensure that the outlet pressure of the pump does not exceed atmospheric pressure.

Oil-free scroll pump Operation：

1, starting

1) Before starting the pump, check the condition of each connection first, and seal it, otherwise it will affect the vacuum.

2) If the wet air or condensable steam is sucked, the inlet should be opened before starting the pump to purify it.

3) It takes 6-8 hours for the pump to reach its limit pressure after its initial start-up or long idle time.

Close the inlet isolation valve and run the pump continuously for 6-8 hours. Open the inflatable valve 2-3 times per hour and empty it for 3-5 seconds each time. But if the pump is stopped in the middle, the moisture may enter the pump, and the time required to reach the limit pressure will be prolonged.

4) When starting and stopping the pump, the isolation valve between the vacuum pump and the vacuum chamber should be closed. Otherwise, debris may be pumped back into the vacuum pump.

5) When restarting a pump that is already at working temperature, before starting the pump, open the inflatable valve and let it out for 3-5 seconds. Otherwise, the temperature of the pump may become unstable and cause failure.

2, operation

Start the pump by following steps:

1) Close the isolation valve to prevent debris from being pumped back into the vacuum chamber. Open the inflatable valve, if it is installed.

2) Turn on the vacuum pump.

3) Open the isolation valve (close the inflatable valve, if installed), and suction the vacuum chamber.

3, pumping gas

1) Continuous running pump is close to its limit pressure (e.g. front stage turbomolecular pump), which may cause foreign matter or moisture to deposit in the pump and cause failure.

2) When operating, close the isolation valve and open the inflatable valve several times for 3-5 seconds, so that once a day, in order to remove foreign bodies in the pump.

3) When operating under specified humidity and pumping steam, the inlet gas temperature must be below 50 C. When the steam humidity is higher than 50 C, a condenser or a condensation trap should be installed in the pipeline between the vacuum chamber and the pump in order to reduce the inlet steam temperature to below 50 C. Suction of steam at temperatures higher than 50 C may cause trouble.

4. Drainage of steam

1) When extracting steam, the air inlet should be opened. If the steam is withdrawn when the outlet is closed, the condensation moisture will remain in the pump, which will cause trouble.

2) When the air intake is opened, the noise level and the limit pressure increase.

5. Purpose of air flushing

1) The tidal volume in the suction pump varies with the temperature and pressure in the vacuum chamber. Suction of humid gas can cause moisture condensation in the pump. This residual moisture may make the ultimate pressure performance of the pump worse or malfunction.

2) When the vacuum chamber contains gas with humidity greater than 60% RH, the air inlet must be turned on to run the pump.

3) Open the air intake operation pump to remove moisture, so that the pump can reach its limit pressure.

6, shutdown

1) After exhausting steam, continue to operate for more than one hour with the air intake open.

2) Close the air intake or stop the pump immediately after exhausting steam, then the condensation moisture will stay in the pump and cause trouble.

3) In order to prevent debris from being pumped back into the vacuum chamber during shutdown, the isolation valve should be closed (open the inflatable valve if it is installed).

4) Close the vacuum pump.

5) When the pump stops, the air is sucked back into the pump from the air intake port, and the pressure inside the pump becomes equal to the atmospheric pressure. In order to maintain the vacuum state in the vacuum chamber and prevent debris from being sucked back into the vacuum chamber from the vacuum pump, the isolation valve leading to the vacuum chamber should be closed before the pump stops.