Application
Vacuum pumps for vacuum impregnation
In vacuum impregnation, the air is drawn out of the pores of a workpiece before the impregnating agent surrounds it; when the vessel is vented, the air pressure pushes the agent into the pores. Busch describes how the impregnating agent thus penetrates every pore, Elmo Rietschle how preservative penetrates deep into the wood. Below you can see how the application works, what vacuum the manufacturers name and which of their series are intended for it ā 229 models from 4 manufacturers.
Compare 229 modelsHow it works
- 229Models
- 7Series
- 4Manufacturers
- 4Industries
Touch the points: each part of the system explains itself.
In short
Vacuum impregnation: the key facts
- WoodFor woodworking, Busch describes how the impregnating agent penetrates every pore under vacuum and names MINK and DOLPHIN (DOLPHIN in the product finder); Elmo Rietschle writes that preservative penetrates deep into the wood.
- Battery cellsBusch names impregnation in the production of lithium batteries: it ensures contact between electrode and electrolyte. R5 RA and COBRA NC/NX are named.
- FishmealBusch describes fishmeal impregnation in fish farming: additives are drawn into the pores of the feed; DOLPHIN is named.
- Further seriesFor vacuum impregnation, Atlas Copco lists the ZRS Roots pumps, Edwards the EH Roots pumps and Leybold the SOGEVAC B oil-lubricated rotary vane vacuum pumps ā each without a description.
Operating principle
How it works: Vacuum impregnation
The drawing shows the basic principle in section. The systems and pumps of the individual manufacturers differ in detail.
- EvacuatingThe workpiece stands in the closed vessel; the vacuum pump draws the air out of the vessel and out of the pores of the material.
- FloodingThe impregnating agent is let in under vacuum and surrounds the workpiece ā for wood, the preservative (Elmo Rietschle); for fish feed, the additives (Busch); for battery cells, the electrolyte.
- VentingThe vessel is vented; the air pressure pushes the agent into the evacuated pores. Busch: the impregnating agent penetrates every pore; Elmo Rietschle: preservative penetrates deep into the wood.
Vacuum and sizing
Vacuum impregnation: how much vacuum is needed
What the manufacturers say about pressure, pumping speed and sizing.
Which vacuum
What is described is the result: the agent penetrates every pore (Busch) or deep into the wood (Elmo Rietschle); in batteries, it ensures contact between electrode and electrolyte (Busch). We determine the required pressure with you on the basis of the material and the impregnating agent.
Which pumps
Busch names the DOLPHIN liquid ring vacuum pump (wood, fishmeal), the MINK claw vacuum pump (wood) as well as R5 RA and COBRA NC/NX (battery cells). Atlas Copco lists the ZRS Roots pumps, Edwards the EH Roots pumps, Leybold the SOGEVAC B. Elmo Rietschle lists impregnation without naming a series.
Technology
Vacuum impregnation: the vacuum pumps the manufacturers name
Listed are the series the manufacturer itself names for this application. āShow only ā¦ā sets the filter of the product overview.
Oil-lubricated rotary vane vacuum pumps
81 models Ā· 3ā1,800 mĀ³/h
Liquid ring vacuum pumps
70 models Ā· 25ā16,160 mĀ³/h
Screw vacuum pumps
36 models Ā· 70ā4,652 mĀ³/h
Claw vacuum pumps
32 models Ā· 18ā1,150 mĀ³/h
Roots vacuum pumps
10 models Ā· 310ā4,140 mĀ³/h
Elmo Rietschle names the application without naming a series for it.
Product overview
Vacuum impregnation: all 229 models compared
Use the filters on the left to narrow the selection ā by manufacturer, technology and the modelsā key figures, for 50 or 60 Hz.
Atlas Copco ZRS series 5 models
Busch COBRA Industry series 36 models
COBRA NS 0070 CPumping speed 70 mĀ³/h 50 Hz85 mĀ³/h 60 HzUltimate pressure 0.03 mbarRated motor power 4 kW 50 Hz4.4 kW 60 HzVariants 
COBRA NC 0100 BPumping speed 110 mĀ³/h 50 Hz130 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 3.5 kW 50 Hz4.8 kW 60 HzVariants 4
COBRA NC 0100 B ECOTORQUEPumping speed 130 mĀ³/h 50 Hz130 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 4.8 kW 50 Hz4.8 kW 60 HzVariants 
COBRA NS 0160 CPumping speed 135 mĀ³/h 50 Hz170 mĀ³/h 60 HzUltimate pressure 0.03 mbarRated motor power 5.5 kW 50 Hz6.6 kW 60 HzVariants 
COBRA NC 0200 BPumping speed 220 mĀ³/h 50 Hz265 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 6 kW 50 Hz7.6 kW 60 HzVariants 4
COBRA NC 0200 B ECOTORQUEPumping speed 265 mĀ³/h 50 Hz265 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.6 kW 50 Hz7.6 kW 60 HzVariants 
COBRA NC 0300 BPumping speed 320 mĀ³/h 50 Hz385 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants 4
COBRA NC 0400 BPumping speed 350 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants 
COBRA NX 0450 APumping speed 350 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 7.5 kW 50 Hz9.5 kW 60 HzVariants 
COBRA NC 0300 B ECOTORQUEPumping speed 385 mĀ³/h 50 Hz385 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 9.5 kW 50 Hz9.5 kW 60 HzVariants 
COBRA NC 0400 B ECOTORQUEPumping speed 420 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.05 mbarRated motor power 9.5 kW 50 Hz9.5 kW 60 HzVariants 
COBRA NX 0450 A ECOTORQUEPumping speed 420 mĀ³/h 50 Hz420 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 11 kW 50 Hz11 kW 60 HzVariants 
COBRA NC 0500 BPumping speed 490 mĀ³/h 50 Hz490 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 9 kW 50 Hz9 kW 60 HzVariants 
COBRA NC 0630 C VRPumping speed 580 mĀ³/h 50 Hz680 mĀ³/h 60 HzUltimate pressure 25 mbarRated motor power 22 kW 50 Hz22 kW 60 HzVariants 
COBRA NS 0600 CPumping speed 600 mĀ³/h 50 Hz600 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants 
COBRA NC 0630 CPumping speed 630 mĀ³/h 50 Hz630 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 15 kW 50 Hz17 kW 60 HzVariants 
COBRA NC 0630 C ECOTORQUEPumping speed 630 mĀ³/h 50 Hz630 mĀ³/h 60 HzUltimate pressure 0.01 mbarRated motor power 17 kW 50 Hz17 kW 60 HzVariants 
COBRA DX 0650 A PLUSPumping speed 650 mĀ³/h 50 Hz650 mĀ³/h 60 HzUltimate pressure 0.1 mbarRated motor power 15 kW 50 Hz15 kW 60 HzVariants Busch DOLPHIN series 70 models
Busch MINK series 32 models
Busch R5 series 58 models
Edwards EH series 5 models
Leybold SOGEVAC series 23 models
No model matches these filters.
Atlas Copco ZRS series 5 models
Busch COBRA Industry series 36 models
Busch DOLPHIN series 70 models
Busch MINK series 32 models
Busch R5 series 58 models
Edwards EH series 5 models
Leybold SOGEVAC series 23 models
Models a manufacturer no longer carries in its current range are listed in its āOutdated modelsā section.
Industries
Vacuum impregnation: where the manufacturers name it
The manufacturers list these uses on their own pages.
Woodworking
Busch describes how the impregnating agent penetrates every pore of the wood under vacuum and names MINK and DOLPHIN; Elmo Rietschle writes that preservative penetrates deep into the wood.
Battery manufacturing
Busch names impregnation in the production of lithium batteries to ensure contact between electrode and electrolyte, with R5 RA and COBRA NC/NX.
Fish farming and aquaculture
Busch describes fishmeal impregnation: additives are drawn into the pores of the feed; DOLPHIN is named.
Chemicals
Elmo Rietschle lists impregnation for the chemical industry without describing it.
Frequently asked questions
Vacuum impregnation: frequently asked questions
How does vacuum impregnation work?
The workpiece stands in a vessel that is evacuated; in the process, the air escapes from the pores. Then the impregnating agent is let in, and when the vessel is vented, the air pressure pushes it into the evacuated pores. Busch describes the result as follows: the impregnating agent penetrates every pore.
Which vacuum pump for impregnating wood?
For impregnation in woodworking, Busch names MINK and DOLPHIN, and in its product finder the DOLPHIN. For woodworking, Elmo Rietschle describes how preservative penetrates deep into the wood, without naming a series.
How much vacuum does impregnation need?
The further the air is drawn out of the pores, the more space remains for the agent; the required pressure depends on the material and on the impregnating agent.
Why are battery cells impregnated?
Busch names impregnation in the production of lithium batteries: it ensures contact between electrode and electrolyte. For this, Busch provides R5 RA and COBRA NC/NX.
What is fishmeal impregnation under vacuum?
Busch describes it for fish farming: under vacuum, additives are drawn into the pores of the feed. Busch names the DOLPHIN liquid ring vacuum pump for this.
Oil-free or oil-lubricated for vacuum impregnation?
Both are named. Dry or without oil: Busch MINK (claw) and DOLPHIN (liquid ring), COBRA NC/NX (screw). Oil-lubricated: Busch R5 RA and Leybold SOGEVAC B. Atlas Copco ZRS and Edwards EH are Roots pumps that need a backing pump.
What are Roots pumps used for in impregnation?
Atlas Copco lists the ZRS and Edwards the EH for vacuum impregnation, both without a description. As a booster, a Roots pump increases the pumping speed of a pumping station ā useful when large vessels are to be evacuated quickly.
What if impregnating agent gets into the pump?
A separator between the vessel and the pump retains vapours and droplets. For wood and fishmeal, Busch names the DOLPHIN liquid ring vacuum pump, whose operating liquid tolerates entrained vapours.
A single pump or a central vacuum system?
A central system in a room of its own keeps noise and heat away from production and matches its output to the demand. Central vacuum systems are planned and built by Eugen Theis Vakuum, a company of the Ehrler & Beck group ā more under Central Vacuum.
Does Ehrler & Beck also supply spare parts and service?
Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.
Which pump suits your process?
Tell us the application, the medium and the volume ā we advise you on selection, spare parts and service.
