Claims
- 1. A vacuum pump assembly comprising: a vacuum pump including a suction port adapted to be placed in flow communication with a space to be evacuated; valve means for opening and closing said suction port; spring means biasing said valve means toward a position to open said suction port; and control means for applying to said valve means a closure pressure acting against said spring means to cause said valve means to close said suction port when said vacuum pump is stopped and for removing said closure pressure therefrom when said vacuum pump is started in order to permit opening of said suction port; said control means including auxiliary valve means operating to open and close in response to starting and stopping of said vacuum pump to control application of said closure pressure to said valve means, cylinder means, piston means operatively engaged within said cylinder means, connecting means joining said piston means with said valve means for effecting correlative movement therebetween, means enclosing a pump working volume within which said valve means and suction port are located, and passage means placing said pump working volume in flow communication with said cylinder means; said auxiliary valve means being connected to effect application of said closure pressure to said piston means within said cylinder means against the force of said spring means; said passage means being sized to permit said closure pressure to flow from within said cylinder means into said pump working volume after said valve means have closed said suction port thereby to effect a delay in the application of said closure pressure within said pump working volume to avoid introduction of said closure pressure into said pump working volume while said suction port is open.
- 2. An assembly according to claim 1 wherein said vacuum pump includes a pump main shaft and wherein said control means include generator means coupled to said pump main shaft for controlling operation of said auxiliary valve means in response to operation of said pump.
- 3. An assembly according to claim 2 wherein said auxiliary valve means comprise an electromagnetically operated valve connected with said generator means.
- 4. A vacuum pump assembly comprising: a vacuum pump including a suction port adapted to be placed in flow communication with a space to be evacuated; valve means for opening and closing said suction port; spring means biasing said valve means toward a position to open said suction port; and control means for applying to said valve means a closure pressure acting against said spring means to cause said valve means to close said suction port when said vacuum port is stopped and for removing said closure pressure therefrom when said vacuum pump is started in order to permit opening of said suction port; said control means including auxiliary valve means operating to open and close in response to starting and stopping of said vacuum pump to control application of said closure pressure to said valve means, cylinder means, piston means operatively engaged within said cylinder means, connecting means joining said piston means with said valve means for effecting correlative movement therebetween, means enclosing a pump working volume within which said valve means and suction port are located, and passage means including means defining a gap between said piston means and said cylinder means placing said pump working volume in flow communication with said cylinder means; said auxiliary valve means being connected to effect application of said closure pressure to said piston means within said cylinder means against the force of said spring means.
- 5. A vacuum pump assembly comprising: a vacuum pump including a suction port adapted to be placed in flow communication with a space to be evacuated; valve means for opening and closing said suction port; spring means biasing said valve means toward a position to open said suction port; and control means for applying to said valve means a closure pressure acting against said spring means to cause said valve means to close said suction port when said vacuum pump is stopped and for removing said closure pressure therefrom when said vacuum pump is started in order to permit opening of said suction port; said control means including auxiliary valve means operating to open and close in response to starting and stopping of said vacuum pump to control application of said closure pressure to said valve means, cylinder means, piston means operatively engaged within said cylinder means, connecting means joining said piston means with said valve means for effecting correlative movement therebetween, means enclosing a pump working volume within which said vlave means and suction port are located, and passage means placing said pump working volume in flow communication with said cylinder means; said auxiliary valve means being connected to effect application of said closure pressure to said piston means within said cylinder means against the force of said spring means; said passage means being sized to permit the suction effect of said vacuum pump to be applied in said cylinder means through said pump working volume when said auxiliary valve means is actuated to terminate application of said closure pressure and before said suction port is opened by said valve means, said passage means thereby operating to delay termination of the application of said closure pressure until after said pump working volume has been evacuated by operation of said pump.
- 6. A vacuum pump assembly comprising: a vacuum pump including a suction port adapted to be placed in flow communication with a space to be evacuated and an exhaust outlet; valve means for opening and closing said suction port; spring means biasing said valve means toward a position to open said suction port; and control means for applying to said valve means a closure pressure acting against said spring means to cause said valve means to close said suction port when said vacuum pump is stopped and for removing said closure pressure therefrom when said vacuum pump is started in order to permit opening of said suction port; said control means including auxiliary valve means operating to open and close in response to starting and stopping of said vacuum pump to control application of said closure pressure to said valve means, cylinder means, piston means operatively engaged within said cylinder means, connecting means joining said piston means with said valve means for effecting correlative movement therebetween, means enclosing a pump working volume within which said valve means and suction port are located, and passage means placing said pump working volume in flow communication with said cylinder means; said auxiliary valve means being connected to effect application of said closure pressure to said piston means within said cylinder means against the force of said spring means; said control means being structured with said spring means acting against one side of said piston means and with said closure pressure applied against the opposite side thereof, said auxiliary valve means being connected to apply the pressure from said exhaust outlet against said opposite side of said piston means as said closure pressure.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2451685 |
Oct 1974 |
DEX |
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Parent Case Info
This application is a Continuation-In-Part of prior application Ser. No. 625,717 filed Oct. 24, 1975, now abandoned.
US Referenced Citations (9)
Foreign Referenced Citations (2)
Number |
Date |
Country |
283484 |
Jul 1921 |
DE2 |
521241 |
Mar 1921 |
FRX |
Continuation in Parts (1)
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Number |
Date |
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Parent |
625717 |
Oct 1975 |
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