Suction pressure control system
First Claim
1. In a multiple compressor refrigeration system in which the compressors are connected in parallel to draw refrigerant vapor from a common suction source;
- the improvement comprising pressure responsive switch means having preselected high and low pressure settings for starting and stopping the compressors in a predetermined sequential order for maintaining the suction pressure on the system within a predetermined range, and time delay means connecting the pressure switch means to the suction source comprising restrictor means for restricting refrigerant flow and delaying concomitant vapor pressure communication from the suction source to the pressure switch means, and one-way flow means for providing unrestricted refrigerant flow and concomitant vapor pressure communication from the pressure switch means to the suction source.
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Accused Products
Abstract
A refrigeration system including multiple parallel compressors for maintaining evaporator suction pressures within preselected ranges, said compressors being sequentially and cyclically operative through control switch means responsive to preselected upper and lower refrigerant suction pressures, a fluidic time delay system for operating the pressure responsive switch means comprising restrictor means interposed between the common suction header for the compressors and the pressure responsive switch means therefor to restrict refrigerant fluid flow to the pressure switches upon increases in suction header pressure, and unidirectional flow means for providing unrestricted reduction of the pressure acting on the switch means upon relative decreases in suction header pressure.
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Citations
11 Claims
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1. In a multiple compressor refrigeration system in which the compressors are connected in parallel to draw refrigerant vapor from a common suction source;
- the improvement comprising pressure responsive switch means having preselected high and low pressure settings for starting and stopping the compressors in a predetermined sequential order for maintaining the suction pressure on the system within a predetermined range, and time delay means connecting the pressure switch means to the suction source comprising restrictor means for restricting refrigerant flow and delaying concomitant vapor pressure communication from the suction source to the pressure switch means, and one-way flow means for providing unrestricted refrigerant flow and concomitant vapor pressure communication from the pressure switch means to the suction source.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- 10. A suction pressure control system for regulating the on-off cycling of compressors in a multiple compressor refrigeration system in which the compressors are connected in parallel to a common suction header, pressure responsive switch means having preselected high and low pressure settings for sequentially starting and stopping the individual compressors in response to progressive increases and decreases in the suction header pressure, variable time delay means interposed between the suction header and said switch means comprising a refrigerant flow restricting device having an inlet side connected to the suction header for delaying the flow of refrigerant vapor therethrough due to pressure increases in the suction header, accumulator means having an inlet connection with the outlet side of said flow restricting device, said accumulator means having an upper outlet connected to said switch means and having a lower outlet below said inlet connection and one-way flow means adapted to establish fluid flow communication from said lower outlet connection to the suction header on the inlet side of said flow restricting device due to a pressure decrease in the suction header relative to the pressure in said accumulator means.
Specification