Variable Pitch Screw Vacuum Pump

Product Description

VDP variable pitch screw vacuum pump, also known as dry screw vacuum pump, is a working chamber composed of a pair of parallel spiral rotors and the pump body. There is no friction between the two screw rotors processed by the five-axis linkage composite machining center and between them and the pump body, and a certain gap is maintained. Multiple sealing cavities are formed between the two rotors and the pump body. When the rotor rotates synchronously and reversely at high speed in the pump shell through the gear, it is an air extraction device that continuously pushes the gas in each sealing cavity from the inlet end to the exhaust end, resulting in suction and exhaust.

The working chamber of the screw pump is gap sealed and free of lubricating oil. It is an environment-friendly vacuum equipment. Therefore, the dry screw pump can pump out the gas containing a large amount of steam and a small amount of dust. It has the advantages of high limit vacuum, low power consumption, energy saving, consumption reduction and maintenance free. It has incomparable advantages, especially in the occasions requiring oil-free cleaning in the semiconductor and electronics industries and the solvent recovery process in chemical and pharmaceutical industries.

Screw vacuum pump is a substitute for traditional water ring vacuum pump, water jet vacuum pump, reciprocating vacuum pump, slide valve vacuum pump, rotary vane vacuum pump and other vacuum pumps. The upgrading of this product can effectively eliminate the sewage discharge of vacuum process in pharmaceutical and chemical industry, facilitate the recovery of tail gas solvent, effectively reduce the oil vapor pollution of slide valve vacuum pump and rotary vane vacuum pump, and reduce the equipment maintenance cost.

Working Principle

Dry screw vacuum pump is an air extraction device that uses a pair of screws to perform suction and exhaust effects caused by synchronous high-speed reverse rotation in the pump shell. The two screws are calibrated by fine dynamic balance, supported by bearings and installed in the pump shell. There is a certain gap between the screws. Therefore, when the pump is working, there is no friction between them, the operation is stable, the noise is low, and the working chamber does not need lubricating oil. Therefore, Dry screw pump can pump out the gas containing a large amount of steam and a small amount of powder. It has higher limit vacuum and lower power consumption. It has the advantages of energy saving, environmental protection, maintenance free and so on. It is an updated product of oil seal / water ring / jet vacuum pump

Performance Characteristics

Variable pitch screw vacuum is also a kind of dry screw vacuum pump. The variable pitch screw vacuum pump compresses step by step in the pump cavity. A pressure gradient can be formed between the stages of the screw to disperse the pressure difference and improve the compression ratio. Therefore, it has low calorific value, low pump working temperature and less cooling water consumption; Low power consumption and low operating noise; High pumping speed under high vacuum, lower operating power and better energy-saving effect!

Advantage:

1 Clean Operation

The seal of the screw rotor of the vacuum pump is designed without water or oil to ensure the clean operation of the vacuum pump

2 High volumetric efficiency

The dry screw vacuum pump can operate continuously from atmospheric pressure to any pressure, and can reach the limit vacuum of 1pA alone, with high efficiency

3 Corrosion resistant design

The surfaces of working chamber, spiral rotor and relevant flow passage parts are provided with anti-corrosion coating (nickel plating / Teflon anti-corrosion coating), which can adapt to harsh working conditions

4 Mechanical seal

Mechanical seal and Teflon lip seal can block the process gas from entering the bearing chamber. The sealing materials are resistant to high temperature and corrosion

5 It can form an oil-free vacuum system with booster pump

In order to meet the needs of different customers, it can form an oil-free vacuum unit with roots vacuum pump and molecular pump

6 Low operating cost

High vacuum degree, low power consumption, recyclable process gas, and the recovery rate is more than 90%

7 Oil free and water free operation

There is no medium in the working chamber. Unlike other vacuum pumps (rotary vane vacuum pump, water ring vacuum pump, etc.), oil or water needs to be replaced, so there is no need to spend the treatment cost of wastewater and oil

8 Reliable processing capacity

There is no medium in the working chamber. Only a pair of high-speed rotating screws can discharge the medium smoothly without residue

9 Simple design, long service life

The rotating parts in the pump cavity have no friction, so the pump has long service life, simple structure and easy maintenance·

10 Low vibration, low noise

The screw is verified by dynamic balance, and the positioning gear is spiral, so the whole machine has low vibration and low noise

VDP  (Horizontal) Technical Parameter：

Model			VDP35	VDP 85	VDP150	VDP280	VDP400	VDP540	VDP630	VDP800	VDP1200
Pumping Speed(m3/h)			35	85	150	280	400	540	630	800	1200
Ultra Pressure(Pa)			1	1	2	2	2	2	2	2	2
Power(KW)			1.5	2.2	4	5.5	7.5	11	15	18.5	22
Speed(RPM)			3000
Size (mm)		Inlet	25	25	40	50	65	80	80	100	125
		Exhaust	15	15	40	40	40	50	50	65	65
Oil Capacity(L)			0.4	0.4	1.3	1.6	1.6	2	2	4	4
Cooling Water(L/min)			1	1	2	4	4	8	8	14	14
Seal Type	Suction		Lip seal	Lip seal	Double Lip seals
	Exhaust		Lip seal	Lip seal	Mechanical Seal
	Shaft Extension				Oil Seal
Weight(Kg) （Without motor）			50	60	230	310	317	405	412	610	620

 

Installation Outline

VDP Variable Pitch Dry Screw Vacuum Pump

Model	L	L1	L2	L3	L4	L5	L6	L7	B	B1	B2	B3
VDP150	1164	1200	900	150	889.5	505	132		619.5	440	220	90
VDP280	1279	1300	900	200	938.5	526	193.5		621.5	440	220	92
VDP400	1279	1300	900	200	938.5	526	193.5		621.5	440	220	92
VDP540	1568	1650	1000	325	1094	592	262		725	496	248	126
VDP630	1568	1650	1000	325	1094	592	262		725	496	248	126
VDP800	1860	1800	1500	150	1441	887.5	180	750	894	560	280	194
VDP1200	1860	1800	1500	150	1441	887.5	180	750	894	560	280	194

 

 

Model

H

H1

H2

n-D0

D1

D2

D3

n-D

d1

d2

d3

n-d

VDP150

626

588

250

4-¢18

¢150

¢110

¢40

4-¢18

¢150

¢110

¢40

4-¢18

VDP280

646

626

270

4-¢18

¢165

¢125

¢50

4-¢18

¢150

¢110

¢40

4-¢18

VDP400

646

626

270

4-¢18

¢185

¢145

¢65

4-¢18

¢150

¢110

¢40

4-¢18

VDP540

678

699

318.5

4-¢22

¢200

¢160

¢80

8-¢18

¢165

¢125

¢50

4-¢18

VDP630

678

699

318.5

4-¢22

¢200

¢160

¢80

8-¢18

¢165

¢125

¢50

4-¢18

VDP800

868

813

376

6-¢22

¢220

¢180

¢100

8-¢18

¢185

¢145

¢65

4-¢18

VDP1200

868

813

376

6-¢22

¢250

¢210

¢125

8-¢18

¢185

¢145

¢65

4-¢18

 

VDP Micro Variable Pitch Dry Screw Vacuum Pump

型号	L	L1	L2	L3	L4	B	B1	B2	B3	B4	H	H1	H2	H3	n-D
VDP35	625	290	95	169	15	254	216	28	144	108	235	135	234	25	4-¢11
VDP85	748	390	95	246	15	254	216	28	144	108	235	135	234	25	4-¢11