Air-Cooled Roots Vacuum Pumps For Sale

Roots Vacuum Pumps

Maximize your industrial efficiency with Ever-Power’s ZJQ Air-Cooled Roots Vacuum Pumps. Featuring oil-free operation, direct atmospheric discharge, and high-pressure capabilities. Ideal for semiconductor, coating, and chemical industries. Explore our ZJQ-600 to ZJQ-10000 series today.

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Roots Vacuum Pumps

The ultimate solution for clean, high-speed, and high-pressure vacuum applications. Engineered for robust performance without the need for water cooling.

Product Overview: The Evolution of Vacuum Technology

At Ever-Power, we understand that modern industry demands vacuum solutions that are not only powerful but also environmentally friendly and easy to integrate. The ZJQ Series represents the pinnacle of industrial Roots vacuum pumps. Unlike traditional pumps that rely heavily on oil sealing or complex water-cooling systems, the ZJQ model utilizes a unique air-cooled design via an external cooler. This allows the gas to circulate and cool automatically, enabling the pump to operate continuously under high pressure without thermal overload.

This dry Roots vacuum pump eliminates the risk of oil backstreaming, ensuring that your vacuum chamber remains free of contaminants—a critical factor for applications in the semiconductor and chemical processing sectors. Whether you are looking for a standalone unit for rough vacuum or a booster to enhance an existing system, the ZJQ series offers unmatched versatility.

Structural schematic diagram

Key Innovation: The ZJQ pump can discharge directly into the atmosphere when used alone, achieving an ultimate pressure of approximately 130 hPa. When combined with backing pumps, it creates a powerful Roots pump vacuum system capable of reaching deep vacuum levels between 105 Pa and 10-2 Pa.

Ever-Power Vacuum Pump Manufacturing Facility

ZJQ Series Main Performance Parameters

Select the correct model for your specific flow rate and pressure requirements. Our engineers recommend sizing your Roots vacuum pump backing pump appropriately to maximize efficiency.

ModelUltimate Pressure
(Single Pump) (Pa)		Ultimate Pressure
(With Backing) (Pa)		Pumping Speed
(L/s)		Max Allowed Pressure Diff
(Pa)		Inlet Dia.
(mm)		Outlet Dia.
(mm)		Cooling Port
(mm)		Power Range
(kW)		Speed
(r/min)
ZJQ-6001.6×10⁴10⁵ Pa ~ 10⁻² Pa6008.4×10⁴2002001007.5 ~ 551500
ZJQ-12001.6×10⁴12008.4×10⁴25025015011 ~ 1321500
ZJQ-18001.3×10⁴18008.7×10⁴32032015015 ~ 2001500
ZJQ-25001.3×10⁴25008.7×10⁴40040020018.5 ~ 2501000
ZJQ-37501.3×10⁴37508.7×10⁴40040020030 ~ 2501500
ZJQ-50001.3×10⁴50008.7×10⁴40040020030 ~ 2501000
ZJQ-75001.3×10⁴75008.7×10⁴50040020045 ~ 250750
ZJQ-100001.3×10⁴100008.7×10⁴50040020055 ~ 3201000

Roots Vacuum Pump Working Principle & Features

Understanding the Roots vacuum pump working principle is key to maximizing its lifespan and efficiency. The ZJQ pump operates via two figure-eight shaped rotors that rotate in opposite directions within the pump casing. These rotors are synchronized by high-precision gears, ensuring they never touch each other or the casing walls. This non-contact rotation allows for high rotational speeds, resulting in significant pumping capacity within a compact footprint.

The unique aspect of the ZJQ series is its gas circulation cooling system. As the gas is compressed, it generates heat. In standard pumps, this heat limits operation at high pressures. However, the ZJQ pumps a portion of the cooled gas back into the pump chamber, effectively lowering the internal temperature. This innovative design allows the pump to work continuously at high pressure differentials where standard industrial Roots vacuum pumps might fail due to overheating.

Advantages of the ZJQ Series

  • Continuous High-Pressure Operation: Thanks to the external cooler, the ZJQ series can handle high inlet pressures and pressure differentials.
  • Clean Vacuum: As a dry Roots vacuum pump, there is no oil in the pumping chamber, making it ideal for applications requiring contamination-free environments.
  • Direct Atmospheric Discharge: Unlike standard boosters, the ZJQ can start from atmospheric pressure and discharge directly into the air, simplifying the startup procedure.
  • Versatile Configuration: Can function as a standalone main pump or as a Roots booster vacuum pump in a multi-stage system.
High Precision Vacuum Testing Equipment
Quality Assurance Lab for Roots Pumps

Roots Vacuum Pump Applications

The versatility of the ZJQ series allows it to serve a wide array of industries. Because it bridges the gap between rough vacuum and high vacuum while handling large volumes of gas, it is a preferred choice for heavy-duty industrial processes. Common Roots vacuum pump applications include:

Vacuum Coating & Metallurgy

The ZJQ is one of the best Roots vacuum pumps for coating systems. It provides the rapid pump-down times required for thin-film deposition, optical coating, and vacuum melting, ensuring high throughput and uniform coating quality.

Chemical & Pharmaceutical

For vacuum drying, distillation, and concentration, the oil-free nature of the ZJQ pump prevents product contamination. It effectively handles solvent vapors when paired with appropriate liquid ring backing pumps.

Semiconductor Manufacturing

A Roots vacuum pump for semiconductor industry usage must be reliable and clean. The ZJQ series supports load-lock chambers and process vacuum lines where rapid evacuation and particle-free environments are non-negotiable.

Power Industry (Transformer Drying)

Large transformers require deep drying to remove moisture from insulation. The high pumping speed of the ZJQ series significantly reduces the drying cycle time compared to conventional piston pumps.

Installation Dimensions

Ensure a proper fit for your facility using our Roots vacuum pump installation guide data below. Proper spacing allows for easy access for maintenance and airflow.

External installation dimensions drawing

Overall Dimensions (mm)

ModelLL1L2L3L4HH1H2H3H4WW1W2
ZJQ-600380540464135944704025255175580520310
ZJQ-12004807005431801065605030305225720620375
ZJQ-18007408256682851065605030305225720620375
ZJQ-250074092075026513881050404302951040950545
ZJQ-375074092075026513881050404302951040950545
ZJQ-500093010719113351661000505051534012801160665
ZJQ-75001230123510814751661405456074548015801400815
ZJQ-100001230123510814751661405456074548015801400815

Connection Flange Dimensions (mm)

ModelD1D2D3D4D5D6dd1d2Kn-K1n-K2n-K3φS
ZJQ-6002002602852002602851001451702212-M1012-M104-M10φ58h6
ZJQ-12002503103352503103351502002252612-M1012-M108-M10φ75h6
ZJQ-18003203954253203954251502002252612-M1212-M128-M10φ75h6
ZJQ-25004004805104004805101602002252816-M1216-M128-M10φ95h6
ZJQ-37504004805104004805101602002252816-M1216-M128-M10φ95h6
ZJQ-50004004805104004805102002602853316-M1216-M1212-M10φ124h6
ZJQ-75005005806104004805102002602853316-M1216-M1212-M10φ124h6
ZJQ-100005005806104004805102002602853316-M1216-M1212-M10φ124h6

System Configuration and Pump Combinations

The ZJQ series is designed for flexibility. Depending on your required ultimate pressure and the nature of the gas being pumped, you can configure it in several ways:

1. Multi-Stage Roots Vacuum Pump Systems

For high-throughput applications, the ZJQ can be used in series. By using a ZJQ unit as a primary booster and backing it with another ZJQ or a standard Roots pump, you create a multi-stage Roots vacuum pump system. This setup significantly increases the compression ratio and total pumping speed.

2. Combination with Liquid Ring Pumps

When dealing with condensable vapors or gases containing moisture, combining the ZJQ with a liquid ring pump is the optimal strategy. The liquid ring pump handles the condensables, while the ZJQ provides the necessary boost in vacuum level. This is a common energy efficient Roots vacuum pump solution for chemical distillation processes.

3. Combination with Rotary Vane or Slide Valve Pumps

For applications requiring a deeper ultimate vacuum, such as in heat treatment or metallurgy, backing the ZJQ with a rotary vane or slide valve pump allows the system to reach pressures as low as 10-2 Pa rapidly.

Precision Machining of Roots Pump Rotors

Maintenance and Reliability

A well-maintained pump is the backbone of production. While the ZJQ series is built for durability, adhering to a Roots vacuum pump maintenance tips schedule will prolong its life.

  • Oil Monitoring: Although the pumping chamber is dry, the gearboxes require lubrication. Regularly check oil levels and quality.
  • Cooler Maintenance: Since this is an air-cooled unit, ensure the external cooler fins are kept clean of dust and debris to maintain heat exchange efficiency.
  • Vibration Checks: Unusual vibrations can indicate rotor misalignment or bearing wear. Refer to our Roots vacuum pump troubleshooting guide or contact our service team immediately if this occurs.

We also offer a full range of Roots vacuum pump spare parts to keep your operations running with minimal downtime.

Why Choose Ever-Power as Your Roots Vacuum Pump Manufacturer?

As a leading Roots vacuum pump manufacturer, Ever-Power combines decades of engineering expertise with modern manufacturing capabilities. Our ZJQ series is the result of rigorous R&D focused on solving the common overheating issues of standard Roots pumps.

We don't just sell pumps; we provide complete vacuum solutions. From the initial calculation of pumping speeds to the final installation and commissioning, our team supports you. Our factory utilizes advanced CNC machining centers and comprehensive testing facilities to ensure every unit meets the "ZJQ Series" performance standards before it ships.

Looking for a Roots vacuum pump sale or a custom system design? Trust Ever-Power for quality, reliability, and service.

Frequently Asked Questions (FAQ)

1. Can the ZJQ Roots pump start directly from atmospheric pressure?

Yes, unlike standard Roots pumps that require a roughing pump to reach a certain pressure before starting, the ZJQ series with its air-cooling circulation system can be started directly at atmospheric pressure and discharge directly to the atmosphere.

2. What is the difference between ZJQ and standard ZJ Roots pumps?

The primary difference is the cooling mechanism. ZJQ pumps have a built-in gas cooler that recirculates cooled gas into the chamber, preventing overheating. This allows the ZJQ to operate at much higher pressure differentials than the standard ZJ series.

3. What type of backing pump should I use with the ZJQ series?

It depends on your application. For clean, dry air, it can work alone. For high vacuum, use a rotary vane or slide valve pump. For wet applications (water vapor), a liquid ring pump is the best backing option.

4. Is the ZJQ pump suitable for pumping corrosive gases?

Standard models are made of cast iron and carbon steel. If you are pumping corrosive gases, please contact us for special anti-corrosion coatings or stainless steel options suitable for the semiconductor or chemical industry.

5. How often does the ZJQ pump require maintenance?

The ZJQ is designed for low maintenance. Oil changes for the gear and bearing housing are typically required every 2,000 to 3,000 hours of operation, depending on the working environment. The cooling system should be checked monthly.

Additional information

edited

by hyw

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Product Quick Detail:

  • Standard and non-standard available
  • With high quality and competitive price
  • Prompt delivery
  • Packing as per customer’s demand.

We promise will offer the best price by the high quality in china! We also accept special order about the products. If you are interested in our products. Please do not hesitate to let us know.We are pleased to give you the detailed information.We promise that our products would be safety and were in high quality and reasonable price. If you are interested in our products, please contact us asap.We are sincerely looking for your cooperation.

Most of our products are exported to Europe or Americas, both standard and nonstandard products available. We can produce as per your drawing or sample. Material can be standard or as per your special request. If you choose us, you choose reliable.

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Materials Available

1. Stainless Steel: SS201, SS303, SS304, SS316, SS416, SS420
2. Steel:C45(K1045), C46(K1046),C20
3. Brass:C36000 ( C26800), C37700 ( HPb59), C38500( HPb58), C27200(CuZn37), C28000(CuZn40)
4. Bronze: C51000, C52100, C54400, etc
5. Iron: 1213, 12L14,1215
6. Aluminum: Al6061, Al6063
7.OEM according to your request
product materials available

Surface Treatment

Annealing, natural canonization, heat treatment, polishing, nickel plating, chrome plating, zinc plating,yellow passivization, gold passivization, satin, Black surface painted etc.

Processing Method

CNC machining, punch,turning, milling, drilling, grinding, broaching, welding and assembly
product finishing

QC & Certificate

Technicians self-check in production,final-check before package by professional Quality inspector
ISO9001:2008 , ISO14001:2001,ISO/TS 16949:2009

Package & Lead Time

Size: Drawings
Wooden Case/Container and pallet, or as per customized specifications.
15-25days samples. 30-45days offcial order
Port: Shanghai/Ningbo port
product packages

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