Product Description

negative pressure roots vacuum pump for pulp dehydration drying

Product Description

Roots blower is a positive displacement blower with impeller end face and front and rear end cover of the blower. The principle is a rotary compressor that uses 2 blade-shaped rotors to move relative to each other in the cylinder to compress and deliver gas. This kind of blower is simple in structure and convenient to manufacture. It is widely used in CZPT aeration, sewage treatment and aeration, cement conveying, and is more suitable for gas conveying and pressurizing systems in low pressure occasions, and can also be used as a vacuum pump.

Vietnam cement 1.5kw pump Tri-Lobe roots blower for Vacuum packaging

Product Parameters

Model Pressure Flow Rate Motor
RHSR50 9.8kpa-58.8kpa 0.67m3/min-2.48m3/min 0.55kw-4kw
63. 7kpa-98kpa 0. 45m3/m in-2. 02m3/min 2.2kw-7.5kw
RHSR65 9.8kpa-58.8kpa 0.95m3/min-3.64m3/min 0.55kw-5.5kw
63.7kpa-98kpa 0. 78m3/m in-2.96m3/min 3kw-11kw
RHSR80 9.8kpa-58.8kpa 2.36m3/min-6.13m3/min 1.5kw-11kw
63.7kpa-98kpa 1.82m3/min-5.24m3/min 5.5kw-15kw
RHSR100 9.8kpa-58.8kpa 3.28m3/min-9.62m3/min 1.5kw-15kw
63.7kpa-98kpa 2.65m3/min-8.67m3/min 7 .5kw-18.5kw
RHSR125 9.8kpa-58.8kpa 5.37m3/min-13.39m3/min 2.2kw-22kw
63. 7kpa-98kpa 4.64m3/min-12.25m3/min 11kw-30kw
RHSR150 9.8kpa-58.8kpa 10 .39m3/min-29. 61 m3/min 5.5kw-55kw
63.7kpa-98kpa 9.53m3/min-28.35m3/min 8.5kw-75kw
RHSR175 9.8kpa-58.8kpa 19.65m3/min-40.67m3/min 11kw-75kw
RHSR200 9.8kpa-58.8kpa 27.65m3/min-58.81 m3/min 15kw-90kw
63. 7kpa-98kpa 25 .34m3/m in-56. 92m3/min 551<w-1321<w
RHSR250 9.8kpa-58.8kpa 61.4m3/min-97.1 m3/min 18.5kw-132kw
63.7kpa-98kpa 58.1 m3/min-93.7m3/min 90kw-220kw
RHSR300 9.8kpa-58 8kpa 87 .1 m3/min-136. 7m3/min 22kw-185kw
63.7kpa-98kpa 83.8m3/min-134.4m3/min 132kw-280kw
RHSR350 9.8kpa-58 8kpa 111.9m3/min-198.1 m3/min 30kw-250kw
63. 7kpa-98kpa 102.2m3/min-179.65m3/min 185kw-400kw

Packaging & Shipping

Roots Blower Packing and Delivery

Wooden case and iron case packaged
Send by ship / plane / train

 Vietnam cement 1.5kw pump Tri-Lobe roots blower for Vacuum packaging


Roots Blower Application
2.Sewage treatment/ Effluent Treatment & Sludge Management
3.Conventional anaerobic & aerobic systems
4.Chemical industry
6.CZPT Waste Management Bio gas plants
7.Engineered landfills
8.Printing and paper feeding
9.Electrical transportation
10.Pneumatic conveying
11.Pneumatic transport
12.Air Pollution Control, Noise Abatement & Ventilation Wet scrubbers
13.Vacuum packaging
14.Part demolding

China Sewage Treatment Industrial Air Roots Blower for Vacuum CZPT Aeration

Roots Blower Features

1.The helical construction uses the stator helical method that the screen lines of casing at the suction and discharge sides are cut to a helical shape,and the triangle suction and discharge port formed by a straight line of the rotor top is to be opened and closed gradually.
2.The rotors are 3 lobes.
3.By adoption of an unique profile of rotor, the clearance between the rotors can be held to be constant, which makes the efficiency even higher.
4.The precision of rotors is fully controlled and variation of precision between blowers is almost nil because the rotors are produced under the mass production control by utilizing a prenision NC maching.
5.The advanced driving gears are adopted but only to extend  the use life but also to make noise lower.
6.The transported air is clean and is any oil-dust free oil lubrication is not needed in casing and the structure design prerent the bearing oil and gear oil from entering the casing.

How Does a Roots Blower Work?

Roots blowers are typically oil-free, air-cooled technologies comprised of 2 rotors that spin in opposite directions. Once the compression chamber comes into contact with the outlet port, compressed air flows back into the housing from the pressure side. Further compression takes place as the volume of the compression chamber further decreases with continued rotation. This means that the compression occurs against full counter-pressure, which results in low efficiency and a high noise level.

The low-efficiency of these blowers limits them to applications requiring very low pressure and single-stage compression. These are also frequently used as vacuum pumps and for pneumatic conveyance.

Hot Selling

Geomembrane                                                     Paddle wheel aerator                                                   Extrusion welder

3 lobe air blowers fish pond roots blower for mining/biogas/aquaculture/sewage treatment/landfill/cement

Company Profile

HangZhou City RuiHeng Building Materials Co., Ltd is specialized in the research, development, production and sales of geosynthetic materials, plastic products and plastic machinery. Our company is devoted to geosynthetic material research and development and application.

Our main products are hdpe geomembrane liner, plastic geogrid, geotextile, 3D geomat, geocell, geomembrane welding machine, extrusion welder and welding rod, etc. Our products have been widely used by clients in more than 20 countries and regions. Our products are applied in aquaculture, railways, highways, water conservancy, electric power, metallurgy, ports and municipal engineering construction. We have won the praises of customers.

Vietnam cement 1.5kw pump Tri-Lobe roots blower for Vacuum packaging


1.Do you have an extended warranty?
Yes, every product is 1 year quality warranty under customer correct using the products.12 months warranty and long-term marketing, after-sales support.

2.If you have a designated forwarder ?
Please contact us and provide destination port details. We have own forwarder. Working term is very fexible in our company.

3.Can you produce according to the samples?
Yes, we can produce by your samples or technical drawings.

4.Do you accept OEM order?
Yes,we can produce as client’s request.OEM and ODM order are accepted, any kind of logo printing or design are available.

Material: Casting Iron
Usage: for Air Conditioner, for Manufacture, for Refrigerate, Aquaculture, Sewage Treatment, Industry
Pressure: High Pressure


.shipping-cost-tm .tm-status-off{background: none;padding:0;color: #1470cc}

Shipping Cost:

Estimated freight per unit.

about shipping cost and estimated delivery time.
Payment Method:


Initial Payment

Full Payment
Currency: US$
Return&refunds: You can apply for a refund up to 30 days after receipt of the products.

Vacuum Pump

Types of vacuum pumps

A vacuum pump is a device that draws gas molecules from a sealed volume and leaves a partial vacuum in its wake. Its job is to create a relative vacuum within a specific volume or volume. There are many types of vacuum pumps, including centrifugal, screw and diaphragm.

Forward centrifugal pump

Positive displacement centrifugal vacuum pumps are one of the most commonly used pump types in the oil and gas industry. Their efficiency is limited to a range of materials and can handle relatively high solids concentrations. However, using these pumps has some advantages over other types of pumps.
Positive displacement pumps have an enlarged cavity on the suction side and a reduced cavity on the discharge side. This makes them ideal for applications involving high viscosity fluids and high pressures. Their design makes it possible to precisely measure and control the amount of liquid pumped. Positive displacement pumps are also ideal for applications requiring precise metering.
Positive displacement pumps are superior to centrifugal pumps in several ways. They can handle higher viscosity materials than centrifuges. These pumps also operate at lower speeds than centrifugal pumps, which makes them more suitable for certain applications. Positive displacement pumps are also less prone to wear.
Positive displacement vacuum pumps operate by drawing fluid into a chamber and expanding it to a larger volume, then venting it to the atmosphere. This process happens several times per second. When maximum expansion is reached, the intake valve closes, the exhaust valve opens, and fluid is ejected. Positive displacement vacuum pumps are highly efficient and commonly used in many industries.

Self-priming centrifugal pump

Self-priming centrifugal pumps are designed with a water reservoir to help remove air from the pump. This water is then recirculated throughout the pump, allowing the pump to run without air. The water reservoir can be located above or in front of the impeller. The pump can then reserve water for the initial start.
The casing of the pump contains an increasingly larger channel forming a cavity retainer and semi-double volute. When water enters the pump through channel A, it flows back to the impeller through channels B-C. When the pump is started a second time, the water in the pump body will be recirculated back through the impeller. This recycling process happens automatically.
These pumps are available in a variety of models and materials. They feature special stainless steel castings that are corrosion and wear-resistant. They can be used in high-pressure applications and their design eliminates the need for inlet check valves and intermediate valves. They can also be equipped with long intake pipes, which do not require activation.
Self-priming centrifugal pumps are designed to run on their own, but there are some limitations. They cannot operate without a liquid source. A foot valve or external liquid source can help you start the self-priming pump.

Screw Pump

The mechanical and thermal characteristics of a screw vacuum pump are critical to its operation. They feature a small gap between the rotor and stator to minimize backflow and thermal growth. Temperature is a key factor in their performance, so they have an internal cooling system that uses water that circulates through the pump’s stator channels. The pump is equipped with a thermostatically controlled valve to regulate the water flow. Also includes a thermostatic switch for thermal control.
Screw vacuum pumps work by trapping gas in the space between the rotor and the housing. The gas is then moved to the exhaust port, where it is expelled at atmospheric pressure. The tapered discharge end of the screw further reduces the volume of gas trapped in the chamber. These two factors allow the pump to work efficiently and safely.
Screw vacuum pumps are designed for a variety of applications. In some applications, the pump needs to operate at very low pressures, such as when pumping large volumes of air. For this application, the SCREWLINE SP pump is ideal. Their low discharge temperature and direct pumping path ensure industrial process uptime. These pumps also feature non-contact shaft seals to reduce mechanical wear. Additionally, they feature a special cantilever bearing arrangement to eliminate potential sources of bearing failure and lubrication contamination.
Screw vacuum pumps use an air-cooled screw to generate a vacuum. They are compact, and clean, and have a remote monitoring system with built-in intelligence. By using the app, users can monitor pump performance remotely.
Vacuum Pump

Diaphragm Pump

Diaphragm vacuum pumps are one of the most common types of vacuum pumps found in laboratories and manufacturing facilities. The diaphragm is an elastomeric membrane held in place around the outer diameter. While it is not possible to seal a diaphragm vacuum pump, there are ways to alleviate the problems associated with this design.
Diaphragm vacuum pumps are versatile and can be used in a variety of clean vacuum applications. These pumps are commercially available with a built-in valve system, but they can also be modified to include one. Because diaphragm pumps are so versatile, it’s important to choose the right type for the job. Understanding how pumps work will help you match the right pump to the right application.
Diaphragm vacuum pumps offer a wide range of advantages, including an extremely long service life. Most diaphragm pumps can last up to ten thousand hours. However, they may be inefficient for processes that require deep vacuum, in which case alternative technologies may be required. Additionally, due to the physics of diaphragm pumps, the size of these pumps may be limited. Also, they are not suitable for high-speed pumping.
Diaphragm vacuum pumps are a versatile subset of laboratory pumps. They are popular for their oil-free construction and low maintenance operation. They are available in a variety of styles and have many optional features. In addition to low maintenance operation, they are chemically resistant and can be used with a variety of sample types. However, diaphragm pumps tend to have lower displacements than other vacuum pumps.

Atmospheric pressure is a key factor in a vacuum pump system

Atmospheric pressure is the pressure created by the collision of air molecules. The more they collide, the greater the pressure. This applies to pure gases and mixtures. When you measure atmospheric pressure, the pressure gauge reads about 14.7 psia. The higher the pressure, the greater the force on the gas molecules.
The gas entering the vacuum pump system is below atmospheric pressure and may contain entrained liquids. The mechanism of this process can be explained by molecular kinetic energy theory. The theory assumes that gas molecules in the atmosphere have high velocities. The resulting gas molecules will then start moving in random directions, colliding with each other and creating pressure on the walls of the vacuum vessel.
Atmospheric pressure is a critical factor in a vacuum pump system. A vacuum pump system is useless without proper atmospheric pressure measurement. The pressure in the atmosphere is the total pressure of all gases, including nitrogen and oxygen. Using total pressure instead of partial pressure can cause problems. The thermal conductivity of various gases varies widely, so working at full pressure can be dangerous.
When choosing a vacuum pump, consider its operating range. Some pumps operate at low atmospheric pressure, while others are designed to operate at high or ultra-high pressure. Different types of pumps employ different technologies that enhance their unique advantages.
Vacuum Pump

The screw pump is less efficient in pumping gases with smaller molecular weight

Vacuuming requires a high-quality pump. This type of pump must be able to pump gas of high purity and very low pressure. Screw pumps can be used in laboratory applications and are more efficient when pumping small molecular weight gases. Chemical resistance is critical to pump life. Chemical resistant materials are also available. Chemically resistant wetted materials minimize wear.
Gear pumps are more efficient than screw pumps, but are less efficient when pumping lower molecular weight gases. Gear pumps also require a larger motor to achieve the same pumping capacity. Compared to gear pumps, progressive cavity pumps also have lower noise levels and longer service life. In addition, gear pumps have a large footprint and are not suitable for tight spaces.
Progressive cavity pumps have two or three screws and a housing and side cover. They are also equipped with gears and bearings. Their mechanical design allows them to operate in high pressure environments with extremely low noise. The progressive cavity pump is a versatile pump that can be used in a variety of applications.
Dry screw compressors have different aspect ratios and can operate at high and low pressures. The maximum allowable differential pressure for screw compressors ranges from 0.4 MPa for 3/5 rotors to 1.5 MPa for 4/6 rotors. These numbers need to be determined on a case-by-case basis.

China Professional Negative Pressure Roots Vacuum Pump for Pulp Dehydration Drying   vacuum pump ac system	China Professional Negative Pressure Roots Vacuum Pump for Pulp Dehydration Drying   vacuum pump ac system
editor by CX 2023-11-09