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B-Tohin Machine (Jiangsu) Co., Ltd.
B-Tohin Machine (Jiangsu) Co., Ltd.

Professional Manufacturer of Various Kinds of Blowers

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DN40 Roots Air Blower

DN40 Roots Air Blower

  • DN40 Roots Air Blower
DN40 Roots Air Blower
Product Details:
Place of Origin: China
Brand Name: BK
Certification: ISO9001/ISO14001/CE
Model Number: BK40
Payment & Shipping Terms:
Minimum Order Quantity: 1 set
Price: Negotiation
Packaging Details: Export standard wooden case
Delivery Time: 5 to 20 working days, depends on order amount and specification
Payment Terms: L/C, T/T
Supply Ability: 50 SETS per month
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Detailed Product Description
Air Capacity: 0.52-2.2m3/min Discharge Differential Pressure: 10-80KPA
Motor Power: 1.5-5.5KW Discharge Bore: DN40
Cooling Type: Air Connection Type: Belt And Pulley
Rotary Speed: 1750-3000rpm
High Light:

roots style blower


belt driven blowe


10KPA - 80KPA small flow DN40 three lobe Roots blower


10KPA - 80KPA Three Lobe Roots Blower DN40 air cooling, vertical instalation


About BK-3
BK-3 series roots blower inherits the design of BK series. It adopts air cooling type and improved rotor curve, which is featured of high efficiency and performance. Also this type blower is of vertical installation type for saving floor space and convenient for maintenance.






Air capacity


Discharge differential pressure


Rotary speed


Motor type

380/400/415/440V/220V, 3PHASES, 50/60HZ, frequencytype

Motor brand

Standard: Siemens Beide or Wannan motor
Siemens and ABB motor for your option

Installation type

Standard: horizontal type

N.W. of blower without motor


Packing size Approx.

1.25*0.85*1.28m (length*width*height)





  • Optimized lobe curve is adopted for reducing blower’s internal leakage, improving blower’s efficiency and reducing running temperature.
  • After radius-center distance ratio narrowed and shaft’s diameter enlarged, no deformation and collision will occur under higher load pressure as the blower’s strength is improved.
  • Special hollow design of end-cover is used for making bearing cavity separated from gas chamber relatively, by which reduces the impact of inside high temperature gas on bearing cavity and lowers the bearing temperature.
  • Deep groove ball bearing of high precision and low friction factor is selected for lowering operation noise. In addition, because of larger size bearing matched for enlarged shaft diameter, the bearing’s load capacity is enhanced and its service life is extended.
  • A structure of 90 degree upper inlet and side outlet is adopted for convenient installation and maintenance. Different silencers are available for customers’ needs of saving floor space.







Inlet capacity (m3/min)and shaft power (kW) under various pressure
0.01Mpa 0.02Mpa 0.03Mpa 0.04Mpa
m3/min KW m3/min KW m3/min KW m3/min KW
BK40 1750 1.30  0.96  1.10  1.12  0.95  1.29  0.83  1.46 
1850 1.33  1.01  1.13  1.19  1.00  1.37  0.90  1.55 
2050 1.60  1.12  1.43  1.32  1.28  1.52  1.17  1.71 
2400 1.83  1.31  1.73  1.54  1.57  1.77  1.45  2.01 
2750 1.97  1.50  1.82  1.77  1.70  2.03  1.60  2.30 
3000 2.20  1.64  2.15  1.93  1.97  2.22  1.88  2.51 





Inlet capacity (m3/min)and shaft power (kW) under various pressure
0.05Mpa 0.06Mpa 0.07Mpa 0.08Mpa
m3/min KW m3/min KW m3/min KW m3/min KW
BK40 1750 0.72  1.63  0.63  1.80  0.53  1.97     
1850 0.78  1.72  0.70  1.90  0.60  2.08  0.52  2.26 
2050 1.07  1.91  0.97  2.11  0.87  2.31  0.78  2.50 
2400 1.35  2.24  1.27  2.47  1.18  2.70  1.10  2.93 
2750 1.50  2.56  1.42  2.83  1.30  3.09  1.20  3.36 
3000 1.82  2.80  1.72  3.08  1.62  3.77  1.53  4.00 



Assembling drawing of blower package

DN40 Roots Air Blower 0 

1. What's the information should I provide when inquiry?
A: Air capacity
B: Pressure
C: Application
D: Use environment(Temperature, atmospheric pressure)
E: Do you need motor?
Or other specials you give us will be more appreciated.

2. What is your warranty?
Our warranty is 12 months after received the roots blower. During the warranty period, replace the damaged parts for free of charge. Out warranty period, to provide timely, high-quality technical services and price concessions spare parts to ensure continuous safe and high-quality equipment operation.

3. How long is the service life of roots blower?
In normal use environment
A- Service life of blower is more than 10 years.
B- Service life of Impeller is more than 60, 000 hours.
C- Service life of bearing is more than 50, 000 hours.
D- Service life of gear is more than 60, 000 hours.

4. What is your terms of packing?
A: Generally, we pack our goods in Fumigation Free Plywood Case. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.

5. How does your factory control product quality?
We have quality inspection department. Before sending out product, we check each product. If there is quality problem, we will produce new one.

6. What are your terms of payment?

Contact Details
B-Tohin Machine (Jiangsu) Co., Ltd.

Contact Person: Iris Xu

Tel: +8615301523076

Send your inquiry directly to us
B-Tohin Machine (Jiangsu) Co., Ltd.
No.69 Xijiu Road, Industrial Park for Environmental SCI & TECH, Yixing, Jiangsu,China
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