Steam limiting control for startup of an absorption machine

Claim 2

In an absorption refrigeration machine including an absorber, a condenser, an evaporator, a chilled medium heat exchange means in heat exchange relationship with said evaporator, a generator, a first heat exchange means in heat exchange relationship with said generator for supplying heated fluid thereto, a second heat exchange means in heat exchange relationship with said absorber, a third heat exchange means in heat exchange relationship with said condenser, a supply conduit adapted to channel cooled heat exchange fluid from a source of cooled fluid to said second and third heat exchange means, and a return conduit adapted to channel fluid from said second and third heat exchange means to the said source of cooled fluid, the improvement comprising a control system including: a. time delay means responsive to a condition indicating the need for operation of said control system, b. first throttling means for increasing the supply of heated fluid to said first heat exchange means upon receipt of a signal, c. first control means responsive to said time delay means for transmitting a signal to said throttling means, d. second throttling means in the cooled heat exchange fluid circuit, said circuit comprising said supply and return conduits and said second and third heat exchange means, e. second control means thermostatically responsive to the temperature of cooled fluid in said fluid circuit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal to said second throttling means dependent upon said cooled fluid temperature and said time delay means signal.

Claim 3

The control system of claim 1 including a thermostatic activating means responsive to the outlet temperature of the chilled medium, said time delay means responsive to said thermostatic activating means.

Claim 4

The control system of claim 2 wherein said first control means is also responsive to said thermostatic activating means.

Claim 5

The control system of claim 3 wherein said thermostatic activating means activates said time delay means to produce a predetermined changing signal therefrom, said first control means relaying a signal to said first throttling means dependent upon said changing signal, said throttling means responsive to the signal relayed by said first control means to increase the flow of said heated fluid to said heat exchange means.

Claim 6

The control system of claim 4 wherein said time delay means operates only when said thermostatic activating means is initially activated by a predetermined temperature of said chilLed medium.

Claim 7

The control system of claim 5 wherein a variable signal dependent upon temperature of said chilled medium is transmitted to said first control means and thereafter being at least partially relayed by said first control means to said first throttling means, the upper level of said variable signal relayed to said first throttling means being limited by said changing signal received by said first control means from said time delay means.

Claim 8

The control system of claim 6 wherein said energy source is a substantially constant pressure pneumatic source.

Claim 9

The control system of claim 7 wherein said time delay means comprises a tank means having an output communicating with said control means, a conduit containing a restrictor means communicating said energy source with said tank means, a valve means in said conduit intermediate said restrictor means and said tank means, said valve means capable of opening and closing responsive to said thermostatic activating means, said valve means when closed additionally communicating said tank means with an energy sink at a lower energy level than said energy source.

Claim 10

The control system of claim 8 wherein said closed valve means communicates said tank means with the atmosphere.

Claim 11

The control system of claim 1 further including: a. a bypass conduit placing said supply conduit and said return conduit in fluid communication and bypassing said source of cooled fluid, b. second control means thermostatically responsive to the temperature of cooled fluid in said return conduit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal dependent upon said cooled fluid temperature and said time delay means signal, c. second throttling means in said bypass conduit responsive to said second control means.

Claim 12

In a multistage generator absorption refrigeration machine including an absorber, a condenser, an evaporator, a chilled medium heat exchange means in heat exchange relationship with said evaporator, a high pressure generator, a low pressure generator, a first heat exchange means in heat exchange relationship with said high pressure generator for supplying heated fluid thereto, a second heat exchange means in heat exchange relationship with said absorber, a third heat exchange means in heat exchange relationship with said condenser, a supply conduit adapted to channel cooled heat exchange fluid from a source of cooled fluid to said second and third heat exchange means, and a return conduit adapted to channel fluid from said second and third heat exchange means to the said source of cooled fluid, the improvement comprising: a. thermostatic activating means responsive to the outlet temperature of the chilled medium, b. time delay means responsive to said thermostatic activating means, c. throttling means for increasing the supply of heated fluid to said first heat exchange means upon receipt of a signal, d. first control means responsive to said time delay means and said thermostatic activating means for transmitting a signal to said throttling means. e. a bypass conduit placing said supply conduit and said return conduit in fluid communication and bypassing said source of cooled fluid, f. second control means thermostatically responsive to the temperature of cooled fluid in said return conduit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal dependent upon said cooled fluid temperature and said time delay means signal, g. second throttling means in said bypass conduit responsive to said second control means.

Claim 13

In a multistage generator absorption refrigeration machine including an absorber, a condenser, an evaporator, a chilled medium heat exchange means in heat exchange relationship with said evaporator, a high pressure generator, a low pressure generator, a first heat exchange means in heat exchange relationship with said high pressure generator for supplying heated fluid thereto, a second heat exchange means in heat exchange relationship with said absorber, a third heat exchange means in heat exchange relationship with said condenser, a supply conduit adapted to channel cooled heat exchange fluid from a source of cooled fluid to said second and third heat exchange means, and a return conduit adapted to channel fluid from said second and third heat exchange means to the said source of cooled fluid, the improvement comprising: a. thermostatic activating means responsive to the outlet temperature of the chilled medium, b. time delay means responsive to said thermostatic activating means, c. throttling means for increasing the supply of heated fluid to said first heat exchange means upon receipt of a signal, d. first control means responsive to said time delay means and said thermostatic activating means for transmitting a signal to said throttling means. e. a bypass conduit placing said supply conduit and said return conduit in fluid communication and bypassing said source of cooled fluid, f. second control means thermostatically responsive to the temperature of cooled fluid in said return conduit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal dependent upon said cooled fluid temperature and said time delay means signal, g. second throttling means in said bypass conduit responsive to said second control means.

Claim 14

In a multistage generator absorption refrigeration machine including an absorber, a condenser, an evaporator, a chilled medium heat exchange means in heat exchange relationship with said evaporator, a high pressure generator, a low pressure generator, a first heat exchange means in heat exchange relatIonship with said high pressure generator for supplying heated fluid thereto, a second heat exchange means in heat exchange relationship with said absorber, a third heat exchange means in heat exchange relationship with said condenser, a supply conduit adapted to channel cooled heat exchange fluid from a source of cooled fluid to said second and third heat exchange means, and a return conduit adapted to channel fluid from said second and third heat exchange means to the said source of cooled fluid, the improvement comprising: a. thermostatic activating means responsive to the outlet temperature of the chilled medium, b. time delay means responsive to said thermostatic activating means, c. throttling means for increasing the supply of heated fluid to said first heat exchange means upon receipt of a signal, d. first control means responsive to said time delay means and said thermostatic activating means for transmitting a signal to said throttling means. e. throttling means in the cooled heat exchange fluid circuit, said circuit comprising said supply and return conduits and said second and third heat exchange means, f. second control means thermostatically responsive to the temperature of cooled fluid in said fluid circuit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal to said throttling means dependent upon said cooled fluid temperature and said time delay means signal.

Claim 15

In a multistage generator absorption refrigeration machine including an absorber, a condenser, an evaporator, a chilled medium heat exchange means in heat exchange relationship with said evaporator, a high pressure generator, a low pressure generator, a first heat exchange means in heat exchange relatIonship with said high pressure generator for supplying heated fluid thereto, a second heat exchange means in heat exchange relationship with said absorber, a third heat exchange means in heat exchange relationship with said condenser, a supply conduit adapted to channel cooled heat exchange fluid from a source of cooled fluid to said second and third heat exchange means, and a return conduit adapted to channel fluid from said second and third heat exchange means to the said source of cooled fluid, the improvement comprising: a. thermostatic activating means responsive to the outlet temperature of the chilled medium, b. time delay means responsive to said thermostatic activating means, c. throttling means for increasing the supply of heated fluid to said first heat exchange means upon receipt of a signal, d. first control means responsive to said time delay means and said thermostatic activating means for transmitting a signal to said throttling means. e. throttling means in the cooled heat exchange fluid circuit, said circuit comprising said supply and return conduits and said second and third heat exchange means, f. second control means thermostatically responsive to the temperature of cooled fluid in said fluid circuit, said second control means additionally responsive to said time delay means, said second control means transmitting a signal to said throttling means dependent upon said cooled fluid temperature and said time delay means signal.