Pumps – Condition responsive control of pump drive motor – With condition responsive control of pump fluid valve
Patent
1999-03-08
2000-11-14
Freay, Charles G.
Pumps
Condition responsive control of pump drive motor
With condition responsive control of pump fluid valve
417 36, 417 442, 417295, F04B 4900, F04B 4906
Patent
active
061461008
ABSTRACT:
In the inlet pipe (7) of the compressor element (1) is provided a pneumatically controlled throttle valve (9), whereas the motor (3) of the compressor element (1) has a pneumatically controlled speed regulator (6). This speed regulator (6) and the throttle valve (9) are both connected to the compressed air receiver (14) via a compressed air pipe (26) and a control device (18). This control device (18) contains an electropneumatic valve (19) in the compressed air pipe (26) which is coupled to an electronic control (20), whereas a pressure sensor (21) is connected to the compressed air receiver (14) and a pressure sensor (22) is erected in the compressed air pipe (26) between the valve (19) and the speed regulator (6) and the throttle valve (9). The control (20) is connected to both pressure sensor (21 and 22) and contains means to control the electropneumatic valve (19) as a function of the measured air receiver pressure and the measured regulating pressure which has been fed back, as well as an electronically adjusted nominal pressure.
REFERENCES:
patent: 3788776 (1974-01-01), Post et al.
patent: 4401413 (1983-08-01), Dickens
patent: 4515515 (1985-05-01), Segonne
patent: 4664601 (1987-05-01), Uchida et al.
patent: 4863355 (1989-09-01), Odagiri et al.
patent: 4998862 (1991-03-01), Hutchinson
patent: 5443369 (1995-08-01), Martin et al.
Atlas Copco Airpower, Naamloze vennootschap
Freay Charles G.
Gray Michael K.
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