Control for liquid ring vacuum pumps
First Claim
Patent Images
1. A control system comprising:
- a suction line;
an exhaust line;
a fresh liquid line;
a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line;
a motor mechanically driving said pump;
one or more sensors connected in said system to measure predetermined parameters within said system;
one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system;
a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensor signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;
the temperature of the liquid ring in said pump is varied within predetermined operating limits stored in said programmable controller to control suction pressure in said suction line.
2 Assignments
0 Petitions
Accused Products
Abstract
A closed loop control is provided to control pressure and/or temperature in a system where one or more liquid ring vacuum pumps evacuate a recipient. The suction ability of the liquid ring vacuum pumps is controlled either by speed control, operating water temperature, switching-on and -off of pumps or bypass-air. Simultaneous control of all operating characteristics is achieved with a programmable electronic controller.
130 Citations
42 Claims
-
1. A control system comprising:
-
a suction line; an exhaust line; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensor signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;the temperature of the liquid ring in said pump is varied within predetermined operating limits stored in said programmable controller to control suction pressure in said suction line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A control system comprising:
-
a suction line; an exhaust line; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed air into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line.
-
-
10. A control system comprising:
-
a suction line; an exhaust line; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system including a temperature sensor installed in said exhaust line; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system including an electically actuable first valve in said fresh liquid line; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said one or more regulating devices; said control system being operative to minimize fresh liquid consumption by said pump; and
whereinthe temperature of the liquid ring in said pump is varied within predetermined operating limits stored in said programmable controller to control suction pressure in said suction line. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A control system comprising:
-
a suction line; an exhaust line; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system including a temperature sensor installed in said exhaust line; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system including an electrically actuable first valve in said fresh liquid line; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed air into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line. - View Dependent Claims (20)
-
-
21. A control system comprising:
-
a suction line; an exhaust line; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said exhaust line, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;one of said sensors comprises a power input sensor connected in the current leads to said motor and supplying power signals to said control device; said system comprises a speed controller for varying the speed of said motor; said control device is responsive to said power signals for controlling said speed controller so that said motor is always run at a predetermined nominal output; and one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed on into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line.
-
-
22. A control system comprising:
-
a suction line; a separator; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said separator, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
whereinthe temperature of the liquid ring in said pump is varied within predetermined operating limits stored in said programmable controller to control suction pressure in said suction line. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
-
-
30. A control system comprising:
-
a suction line; a separator; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said separator, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors conected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; and
wherein;one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed air into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line.
-
-
31. A control system comprising:
-
a suction line; a separator; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said separator, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; one of said sensors comprises a temperature sensor installed in said separator; one of said regulating devices comprises an electrically actuable first valve in said fresh liquid line; said control system being operative to minimize fresh liquid consumption by said pump; and
whereinthe temperature of the liquid ring in said pump is varied within predetermined operating limits stored in said programmable controller to control suction pressure in said suction line. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39)
-
-
40. A control system comprising:
-
a suction line; a separator; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said separator, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals operated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; one of said sensors comprises a temperature sensor installed in said separator; one of said regulating devices comprises an electrically actuable first valve in said fresh liquid line; said control system being operative to minimize fresh liquid consumption by said pump; and
wherein;one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed air into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line. - View Dependent Claims (41)
-
-
42. A control system comprising:
-
a suction line; a separator; a fresh liquid line; a liquid ring vacuum pump having a suction input coupled to said suction line, an exhaust output coupled to said separator, a liquid input coupled to said fresh liquid line; a motor mechanically driving said pump; one or more sensors connected in said system to measure predetermined parameters within said system; one or more regulating devices connected in said system to vary one or more respective operative characteristics of said system; a programmable controller having inputs coupled to said one or more sensors and control signal outputs coupled to said one or more regulating devices and to said motor, said programmable controller having stored chronological and logical functions and being responsive to said stored functions and electrical sensing signals generated by said one or more sensors to control the rotating speed and or power output of said motor and for controlling said regulating devices; one of said sensors comprises a power input sensor connected in the current leads to said motor and supplying power signals to said control device;
said system comprises a speed controller for varying the speed of said motor; and
said control device is responsive to said power signals for controlling said speed controller so that said motor is always run at a predetermined nominal output and wherein;one of said regulating devices comprises an electrically actuable second valve connected in said suction line, said second valve being controlled by said control device to bleed air into said suction line in accordance with a predetermined pressure limit to regulate air input in said suction line to prevent cavitation in the liquid ring in dependence on the temperature in said exhaust line and pressure in said suction line.
-
Specification