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Vacuum pressure controller

a vacuum pump and controller technology, applied in the direction of pump control, vacuum distillation separation, separation process, etc., can solve the problems of increasing the life of the pump and the temperature of the pump, and achieve the effect of preventing condensation in the vacuum pump, prolonging the maintenance interval, and prolonging the pump li

Inactive Publication Date: 2006-09-21
THOMAS IND INC
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  • Application Information

AI Technical Summary

Benefits of technology

[0006] The invention provides a vacuum pressure controller in which a dry gas, for example air, is bled into the vacuum stream in connection with maintaining the required vacuum pressure in the system. The gas bled into the vacuum stream dilutes the vapor, cools the mixture of vapor and gas admitted to the pump, prevents condensation in the vacuum pump. The result is a longer pump-life, longer maintenance intervals, a lower operation cost, and quicker recovery of the pump.
[0007] Using the invention, the diluted vapor is less chemically aggressive on the pump and other parts of the system. In addition, the lower operating temperature of the vapor diluted with the gas lowers the pump temperature, which increases its life. The vapor diluted with air also helps prevent internal condensation in the pump and by always permitting a flow through the pump, it lowers oil contamination in oil-sealed pumps. Since the pump can be run at or near its full speed all the time, the pump will recover quickly to its original vacuum pressure once the bleed valve is shut.

Problems solved by technology

In addition, the lower operating temperature of the vapor diluted with the gas lowers the pump temperature, which increases its life.

Method used

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Embodiment Construction

[0014] Referring to FIG. 1, the system 10 includes a rotary separator distillation apparatus 12, a vacuum pump 14 and a vacuum pressure controller 16 of the invention. The vacuum pressure controller 16 includes an air bleed valve 18 and a control unit 20. A first vacuum pressure line 22 connects the pump 14 to a manifold 24 of the unit 16 and a second vacuum pressure line 26 connects the manifold 24 to the rotary evaporator 12. A pressure transducer 28 is in communication with the manifold 24 to provide an electrical signal indicative of the vacuum pressure within manifold 24, which signal is input to control unit 20 by line 30. Control unit 20 includes dial 32 and pressure gauge 34 for a user to dial-in the level of vacuum that the user desires the system to produce. Line 36 connects the output of control unit 20 to the control input of valve 18 and control unit 20 controls valve 18, which may be a proportional valve or an on-off valve. Control unit 20 is similar to control units w...

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Abstract

A vacuum pressure controller for vacuum distillation equipment is controlled to mix a dilution gas with the distillation vapors to control the vacuum pressure to which the distillation equipment is subjected.

Description

[0001] This application claims priority of U.S. provisional application 60 / 662,157 filed Mar. 16, 2005.FIELD OF THE INVENTION [0002] This invention relates to a vacuum pressure controller of the type that is used for rotary evaporators, vacuum ovens and stationary distillation equipment BACKGROUND OF THE INVENTION [0003] Vacuum pressure controllers are used in several chemical laboratory applications such as rotary evaporators, vacuum ovens and stationary distillation equipment. Of these, rotary evaporators are by far the predominant usage. [0004] Vacuum pressure controllers maintain present vacuum pressure during these distillation processes at temperatures typically not exceeding 180° C. and for volumes up to about 30 liters of distilled liquid. The typical process setup consists of a distillation apparatus, a condenser with a liquid collector, a pressure controller and a vacuum pump. A rotary evaporator is disclosed, for example, in U.S. Pat. No. 6,709,025. Chemicals used during ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B49/00
CPCB01D3/085B01D3/10
Inventor FUKSA, RICHARD C.KNUDSEN, RENO G.
Owner THOMAS IND INC
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