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Bourdon-Tube Pressure Gauge
The heart of a dial pressure gauge is the Bourdon tube: a metal tube of oval section bent into a C and sealed at its free end. The greater the pressure, the farther the free tip moves, but only about 0.125–0.25 in (3–6 mm) across the whole range. A geared movement, built much like clockwork, turns that small movement into the sweep of a pointer, usually over 270° of dial. The tube metal must take a spring temper; phosphor bronze is used for most gauges for air, light oil or water, and beryllium copper for high pressure. The tube's wall thickness and the radius of its curve set the pressure range.
Abantado
Factory process
Mga Tagubilin
1
1
Roll the C
Roll the C
Pass the tubing over a lubricated steel mandrel and between two grooved, powered rollers. One roller grips the end and bends the inside radius while the other presses from outside; the grooves keep the tube from flattening.
Mga materyales para sa hakbang na ito:
Tubong phosphor bronze1 as requiredMga kailangang kasangkapan:
Makinang pambaluktot ng Bourdon tube2
2
Cut and heat treat
Cut and heat treat
As the roller keeps turning, a saw blade on it cuts the tube to length. Heat treat the tubes in ovens to give them their spring temper.
Mga kailangang kasangkapan:
Hurno para sa heat treatment3
3
Machine the socket
Machine the socket
Turn, drill, mill and thread the socket from bar stock in one cycle on a machining centre. One end is threaded to screw into the pressure source.
Mga materyales para sa hakbang na ito:
Bilog na Baras ng Bronse1 as requiredMga kailangang kasangkapan:
Sentro ng CNC machining4
4
Join tube and socket
Join tube and socket
Solder, braze or weld the open end of the tube to the socket, locating the free end precisely, and seal the free end the same way. Fit an endpiece to the tip; its small hole links the tip to the movement.
Mga kailangang kasangkapan:
Pang-hinang na brazing5
5
Fit movement, dial and pointer
Fit movement, dial and pointer
Mount the movement, the dial and the pointer onto the socket as a group.
Mga materyales para sa hakbang na ito:
Mekanismo ng pressure gauge1 piraso
Dial at karayom ng gauge1 piraso6
6
Calibrate and case
Calibrate and case
Connect the assembly to a pressure source alongside a master gauge of known accuracy and adjust it until it reads the same; 2% is a common accuracy, finer grades 1, 0.5 or 0.25%. Then fit the case and lens.
Mga materyales para sa hakbang na ito:
Kaha at lente ng gauge1 pirasoMga kailangang kasangkapan:
Bangkong pangkalibrasyon na may master gaugeMga Materyales
5- 1 as requiredPlaceholder
- 1 as requiredPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
5- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
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