Product Description
Model Code Explanation
Preface
G-type single screw pumps have been widely used in developed countries, where they are mostly referred to as “Mono Pumps” (MONOPUMPS); in Germany they are called “eccentric rotor pumps”. Thanks to their excellent performance, their application range has been rapidly expanding in the domestic market in recent years.
These pumps are characterized by strong adaptability to different media, smooth flow, very low pressure pulsation and high self-priming capability.
We have analyzed and studied related G-type single screw pump products, learned from advanced designs and continuously improved our own products. At present, our G-series pumps have formed a complete system with discharge pressure from 0.6 to 1.2 MPa, and for special requirements the pressure can be up to 3 MPa, fully meeting various user demands for G-type single screw pumps.
The pumps manufactured by our company are reliable in quality, covered by a full warranty service, and relatively economical in price, with assured availability of spare parts.
We warmly serve our customers and can undertake the design and manufacture of G-type single screw pumps according to special requirements.
Principle and Characteristics
G-type single screw pumps are a new type of pump operating on the rotary positive-displacement meshing principle. The main working components are the eccentric screw (rotor) and the fixed liner (stator).
Due to the special geometric shape of these two components, a series of independent sealed cavities are formed. The medium is conveyed axially in a uniform manner with low internal flow velocity, constant displacement and stable pressure, so no vortex or agitation is generated. The discharge pressure of each pump stage is 0.6 MPa, with a head of 60 m (for clean water), and a typical self-priming height of 6 m. It is suitable for conveying media with temperatures below 80 °C (up to 150 °C for special requirements).
Since the stator is made of various elastic materials, this pump is particularly suitable for conveying high-viscosity fluids and media containing hard suspended particles or fibrous materials, where ordinary pumps are often inadequate. The flow rate is proportional to the rotational speed.
The pump can be driven directly via a coupling, or by using a variable-speed motor, V-belt, gearbox and other speed control devices.
The pump has few spare parts, a compact structure, small size and easy maintenance. The rotor and stator are the main wearing parts of the pump, but their structure is simple and easy to assemble and disassemble.
Structure Diagram
|
1
|
Discharge port
|
2
|
Tie rod
|
3
|
Stator
|
4
|
Screw shaft
|
5
|
Universal joint assembly
|
6
|
Suction port
|
|
7
|
Connecting shaft
|
8
|
Packing housing
|
9
|
Packing gland
|
10
|
Bearing housing
|
11
|
Bearing cover
|
12
|
Motor
|
|
13
|
Coupling
|
14
|
Shaft sleeve
|
15
|
Bearing
|
16
|
Drive shaft
|
17
|
Base
|
Application Range
In general, G-type single screw pumps can be used as a general-purpose conveying unit. The operating speed can be high or low, and the rated discharge pressure can be increased by adding stages: each additional stage increases the pressure by 0.6 MPa, so the application range is extremely wide.
1. Environmental protection: Conveying industrial wastewater, domestic sewage, sludge and turbid water containing solid particles and short fibers. Especially suitable for use with oil–water separators, filter presses and similar equipment.
2. Marine industry: Conveying bilge cleaning liquids, oil–water mixtures, oil sludge and oily wastewater.
3. Petroleum industry: Conveying crude oil. In recent years it has been successfully used to lift mixtures of crude oil and water from depths of over one thousand meters, as well as coalbed gas and water mixtures in coalfields, greatly reducing the cost of mechanical oil extraction and gas recovery. In the late stage of oilfield development, screw pumps are also used to inject polymers into the formation to enhance oil recovery.
4. Pharmaceutical and daily chemical: Conveying various viscous slurries, emulsions, ointments and cosmetic products.
5. Food and canning industry: Conveying viscous starch, edible oil, honey, syrups, fruit pulp, cream, minced fish and meat, as well as various by-products.
6. Brewing industry: Conveying various fermented viscous liquids, thick distiller’s grains, grain residues, sauces, pastes and viscous liquids containing solid chunks.
7. Construction industry: Spraying and conveying cement mortar, lime slurry, coatings and other paste-like materials.
8. Mining industry: Pumping underground water and slurry containing solid particles to the surface from mine workings.
9. Chemical industry: Conveying various suspensions, oils and fats, colloidal slurries and adhesives.
10. Printing and papermaking: Conveying high-viscosity inks, PVC wallpaper paste, paper stock of various consistencies and short-fiber pulps.
Performance Parameters
|
Model
|
Speed
r/min |
Flow
m3/h |
Pressure
MPa |
Motor
kW |
Head
m |
Inlet
mm |
Outlet
mm |
Allowable particle diameter
mm |
Allowable maintenance length
mm |
|
G20-1
|
960
|
0.8
|
0.6
|
0.75
|
60
|
25
|
25
|
1.5
|
25
|
|
G20-2
|
960
|
0.8
|
1.2
|
1.5
|
60
|
25
|
25
|
1.5
|
25
|
|
G25-1
|
960
|
2
|
0.6
|
1.5
|
60
|
32
|
25
|
2
|
30
|
|
G25-2
|
960
|
2
|
1.2
|
2.2
|
120
|
32
|
25
|
2
|
30
|
|
G30-1
|
960
|
5
|
0.6
|
2.2
|
60
|
50
|
40
|
2.5
|
35
|
|
G30-2
|
960
|
5
|
1.2
|
3.0
|
120
|
50
|
40
|
2.5
|
35
|
|
G35-1
|
960
|
8
|
0.6
|
3.0
|
60
|
65
|
50
|
3
|
40
|
|
G35-2
|
960
|
8
|
1.2
|
4.0
|
120
|
65
|
50
|
3
|
40
|
|
G40-1
|
960
|
12
|
0.6
|
4.0
|
60
|
80
|
65
|
3.8
|
45
|
|
G40-2
|
960
|
12
|
1.2
|
5.5
|
120
|
80
|
65
|
3.8
|
45
|
|
G50-1
|
960
|
20
|
0.6
|
5.5
|
60
|
100
|
80
|
5
|
50
|
|
G50-2
|
960
|
20
|
1.2
|
7.5
|
120
|
100
|
80
|
5
|
50
|
|
G60-1
|
960
|
30
|
0.6
|
11
|
60
|
125
|
100
|
6
|
60
|
|
G60-2
|
960
|
30
|
1.2
|
15
|
120
|
125
|
100
|
6
|
60
|
|
G70-1
|
960
|
45
|
0.6
|
15
|
60
|
150
|
125
|
8
|
70
|
|
G70-2
|
720
|
45
|
1.2
|
18.5
|
120
|
150
|
125
|
8
|
70
|
|
G85-1
|
720
|
65
|
0.6
|
15
|
60
|
150
|
150
|
10
|
80
|
|
G105-1
|
500
|
100
|
0.6
|
22
|
60
|
200
|
200
|
15
|
110
|
|
G135-1
|
400
|
150
|
0.6
|
37
|
60
|
250
|
250
|
20
|
150
|
Please Note
1. The test data in the performance table are based on clean water at 20 °C with a viscosity of 1 mm²/s.
2. When the pump conveys high-viscosity media or media containing particles, the pump speed must be adjusted according to the properties of the medium.
3. When conveying media with different degrees of abrasiveness, the pump speed must also be adjusted accordingly.
Notes
1. Before starting, always confirm the direction of rotation; reverse rotation is strictly prohibited.
2. It is strictly forbidden to run the pump dry without medium, in order to avoid damage to the stator.
3. For newly installed pumps or pumps that have been shut down for several days, do not start directly. Inject an appropriate amount of lubricating oil into the pump body first, then turn the pump several revolutions with a pipe wrench before starting.
4. After conveying high-viscosity, particle-laden or corrosive media, the pump should be flushed with water or a suitable cleaning agent to prevent blockage and avoid difficulty in the next startup.
5. In winter, drain any residual liquid in the pump to prevent freezing and cracking.
6. During operation, lubricating oil should be added periodically to the bearing housing. If leakage is found at the shaft end, handle it promptly or replace the oil seal.
7. If any abnormal conditions occur during operation, stop the pump immediately, check the cause and eliminate the fault before restarting.