RNN Series Differentially Pumped Rotary Seal

Differentially pumped rotary seals (RNNs) provide 360° of continuous rotary freedom through the vacuum wall of a UHV system. The RNN has two stages of differential pumping isolated by graphite-impregnated, expanded, Teflon® seals on special sealing surfaces. A preloaded ball bearing set accurately controls the rotating stage position.

rnn600

RNNs are available with a worm drive fine adjust option. This allows for easier and more accurate angle adjustment. RNNs are also available with anti-backlash stepping or synchronous motor drive.

RNNs with up to 12" I.D. are listed. Larger I.D.s have been built with excellent performance. Please consult factory for special applications.

Specifications

  • Models with clear inside diameters of 1.53" to 12" standard, larger sizes on request
  • Bakeable to 150°C
  • Stationary and rotation flanges, tapped
  • Thickness approximately that of two ConFlat-type flanges
  • 2 stage differentially pumped
  • Base pressures in 10-11 Torr range
  • 0–360° scale with Vernier, standard

Typical Performance Specifications for RNN-400 and larger models

  • Resolution:      <0.004°
  • Repeatability:  <0.008°
  • Backlash:        <0.035°

Readability Specifications

  • Standard scale: 1.0°
  • Mechanical counter: 0.1°
  • Microstepped motor drive required for maximum resolution

Options

  • Fine adjust worm drive
  • Digital read-out on fine adjust, 0.1° read-out, mechanical, nonresetable
  • Mechanical counter option available
  • Anti-backlash stepping motor drive 0.018° per full step (0.0225°/full step on RNN-150/MS), with manual knob
  • Custom pumpout tube lengths and crank shaft lengths on /FA units available

Payloads

The standard maximum payloads are listed below. Larger loads may be handled under specific applications. Please consult the factory for custom applications.

  • The center of gravity of the payload is within “X” of the polar axis of the unit, where X is equal to 10% of the RNN I.D.
  • The center of gravity of the payload is within “Y” distance of the rotating flange on the horizontal mounted units, where Y is the flange I.D.
  • The overall maximum size “A” of the payload outside vacuum is:
    Vertical operation: 7 x flange O.D.    Horizontal operation: 5 x flange O.D.    Inverted operation: 7 x flange O.D.
Model No. Vertical Horizontal Inverted
RNN-150 54 lbs 30 lbs 45 lbs
RNN-250 90 lbs 38 lbs 70 lbs
RNN-400 144 lbs 66 lbs 110 lbs
RNN-600 180 lbs 84 lbs 140 lbs
RNN-800 200 lbs 91 lbs 160 lbs
RNN-1000 370 lbs 160 lbs 280 lbs
RNN-1200 430 lbs 200 lbs 350 lbs
 

Payload Location

 

Table 1. RNN Series Differentially Pumped Rotary Seals

rnn_1_large-cleaned

(includes a removeable adjustment wrench)

I.D. Flange
O.D.
A B C D E F G H Model
No.
1.53 2.75 4.50 2.99 1.0 3.18 2.75 .49 .13 60° RNN-150
1.53 2.75/6 1 6.00 2.99 1.34 3.33 2.75 .15 .13 45° RNN-150/6
2.53 4.5 5.75 3.64 1.36 3.58 4.50 .49 .03 45° RNN-250
2.53 4.5/6 1 6.00 3.64 1.52 3.71 4.50 .33 .03 45° RNN-250/6
4.03 6 7.75 4.57 1.68 4.34 6.02 .37 .06 45° RNN-400
6.03 8 10.25 6.16 1.74 5.70 8.00 .42 .13 54° RNN-600
8.00 10 12.05 7.03 1.94 6.70 10.00 .42 .13 45° RNN-800
10.00 13.25 15.75 8.81 2.37 8.50 13.28 .29 .13 24° RNN-1000
12.00 14 20.00 3.34 RNN-1200

Dimensions in inches
1 Signifies mounting flange sizes respectively

Table 2. RNN/FA Differentially Pumped Rotary Seals with Fine Adjust 1

rnn_2_large
I.D. Flange
O.D.
A B C D E F G H I Drive
Ratio
Model
No.
1.53 2.75 5.13 3.38 1.00 4.95 2.75 .49 0.37 60° 3 80:1 RNN-150/FA
1.53 2.75/6 2 6.00 3.84 1.34 5.32 2.75 .15 0.37 45° 3 100:1 RNN-150/6/FA
2.53 4.5 6.38 4.20 1.36 6.11 4.50 .49 0.41 45° 3 100:1 RNN-250/FA
2.53 4.5/6 2 6.38 4.20 1.52 6.11 4.50 .33 0.41 45° 3 100:1 RNN-250/6/FA
4.03 6 8.50 8.25 1.68 9.28 6.02 .37 0.54 45° 4 100:1 RNN-400/FA
6.03 8 10.25 8.50 1.74 9.93 8.00 .42 1.10 54° 5 100:1 RNN-600/FA
8.00 10 12.75 9.56 1.94 11.50 10.00 .42 1.10 45° 5 100:1 RNN-800/FA
10.00 13.25 17.00 11.86 2.37 17.25 13.28 .29 .91 24° 7 100:1 RNN-1000/FA
12.00 14 Consult Factory RNN-1200/FA

Dimensions in inches

1 The fine adjust units utilize worm drive and are dynamic anti-backlash on RNN-400 and larger models. They come with large knobs and crank handles.
2 Signifies mounting flange sizes respectively

Table 3. RNN/MS or /MY Differentially Pumped Rotary Seals with Anti-Backlash  /MS Stepping or /MY Synchronous Motor Drive  1

rnn_3_large
I.D. Flange
O.D.
A B C D E F G H I Drive
Ratio
Model
No.
1.53 2.75 5.13 10.00 1.00 9.97 2.75 .49 0.74 60° 3.39 80:1 RNN-150/MS or /MY
1.53 2.75/6 2 5.13 10.00 1.34 9.97 2.75 .15 0.74 45° 3.39 100:1 RNN-150/6/MS or /MY
2.53 4.5 6.38 10.10 1.36 8.30 4.50 .49 0.41 45° 3.39 100:1 RNN-250/MS or /MY
2.53 4.5/6 2 6.38 10.10 1.52 8.30 4.50 .33 0.41 45° 3.39 100:1 RNN-250/6/MS or /MY
4.03 6 8.50 9.77 1.68 11.69 6.02 .37 0.54 45° 3.39 100:1 RNN-400/MS or /MY
6.03 8 10.20 10.13 1.74 11.69 8.00 .42 1.10 54° 3.39 100:1 RNN-600/MS or /MY
8.00 10 12.75 11.39 1.94 11.69 10.00 .42 1.10 45° 3.39 100:1 RNN-800/MS or /MY
10.00 13.25 Consult Factory RNN-1000/MS or /MY
12.00 14 Consult Factory RNN-1200/MS or /MY
18.00 24 Consult Factory RNN-1800/MS
24.00 34 Consult Factory RNN-2400/MS

Dimensions in inches

1 The motor drive units utilize worm drive and are all dynamic anti-backlash with hand knobs at the rear of the motor
2 Signifies mounting flange sizes respectively

Options

Mechanical Counter

  • Add digital read-out to fine adjust or motor drive unit
  • 0.1° read-out, mechanical, nonresetable
  • Viewable from the side
  • Solution to difficulty caused by equipment mounted to platform obstructing view of degree scale
  • When /MC option is selected the Vernier scale is not included

Valve Manifold System

  • Allows first stage pump to evacuate second stage pump
  • Includes: two modified 1.33" O.D. flange nipples; BVV-025 bakeable valve; flexible metal plumbing
  • Assembled on RNN platform

2 l/s Appendage Ion Pump Assembly

  • Use with valve manifold system
  • Allows continuous pumping of RNN
  • Includes Alnico magnet
  • Requires ion pump control unit

Ion Pump Control UnitPS-20 110/115 V      PS-20E 220/230 V

  • Use with 2 l/s appendage ion pump assembly
  • Power input: 115 VAC, 60 Hz or 230 VAC, 50 Hz (specify with order)
  • Power output: 5 kV DC
  • Includes HV coax cable and power cord

For more information see Ion Pump Power Supplies.

Call or email with your requirements and for current pricing.

800.962.2310 / sales@thermionics.com