Compressor system with demand cooling
First Claim
1. In a refrigeration system including a compressor having a suction manifold and a discharge chamber, a condenser, and an evaporator connected to said compressor in a serial closed loop system, improved means for preventing overheating of said compressor comprising sensor means within said discharge chamber of said compressor and in the flowpath of said compressed gas for sensing the temperature of compressed gas therein, a fluid line connected between the outlet of said condenser and said compressor suction manifold and control means operative to selectively control fluid flow from said condenser outlet to said suction manifold in response to said sensed temperature of said compressed gas, wherein said compressor includes a plurality of compression chambers, each of said compression chambers receiving suction gas from said suction manifold and discharging said compressed gas into said discharge chamber via respective discharge ports said sensor means being located within said discharge chamber closest to the discharge port through which said compressed gas having the highest temperature enters said discharge chamber.
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Accused Products
Abstract
A refrigeration system is disclosed which incorporates apparatus for preventing overheating of the compressor by selectively feeding liquid refrigerant from the outlet of the condenser to the compressor. In one embodiment the refrigerant fluid from the compressor is injected into the suction manifold of the compressor. In another embodiment this fluid is injected directly into the compression chamber or chambers. Control means are provided which include a temperature sensor located within the compressor discharge chamber and valve means responsive thereto to control the flow of liquid refrigerant to the suction manifold or compression chamber.
149 Citations
22 Claims
- 1. In a refrigeration system including a compressor having a suction manifold and a discharge chamber, a condenser, and an evaporator connected to said compressor in a serial closed loop system, improved means for preventing overheating of said compressor comprising sensor means within said discharge chamber of said compressor and in the flowpath of said compressed gas for sensing the temperature of compressed gas therein, a fluid line connected between the outlet of said condenser and said compressor suction manifold and control means operative to selectively control fluid flow from said condenser outlet to said suction manifold in response to said sensed temperature of said compressed gas, wherein said compressor includes a plurality of compression chambers, each of said compression chambers receiving suction gas from said suction manifold and discharging said compressed gas into said discharge chamber via respective discharge ports said sensor means being located within said discharge chamber closest to the discharge port through which said compressed gas having the highest temperature enters said discharge chamber.
- 13. In a refrigeration system including a compressor having a suction manifold, a discharge chamber, and a plurality of compression chambers, a condenser, an evaporator and means interconnecting said compressor, condenser and evaporator in a serial closed loop system, said suction manifold being operative to supply suction gas to each of said plurality of compression chambers and each of said compression chambers being operative to discharge compressed gas into said discharge chamber via discharge ports associated with each of said compression chambers, improved means for preventing overheating of said compressor comprising sensor means positioned within said discharge chamber substantially centrally of said discharge ports so as to be in direct contact with said compressed gas entering said discharge chamber, said sensor means being operative to sense the temperature of said compressed gas, a fluid line extending between the outlet of said condenser and said suction manifold of said compressor and control means operative to allow fluid flow from said condenser outlet to said suction manifold in response to said sensor means sensing a temperature above a first predetermined temperature and to prevent said fluid flow in response to said sensor means sensing a temperature below a second predetermined temperature whereby overheating of said compressor may be inhibited.
- 20. In a refrigeration system including a compressor having a suction manifold and discharge chamber, a condenser, and an evaporator connected to said compressor in a serial closed loop system, improved means for preventing overheating of said compressor comprising sensor means within said discharge chamber of said compressor and in the flowpath of said compressed gas for sensing the temperature of compressed gas therein, a fluid line connected to the outlet of said condenser and to said compressor and control means operative to selectively control fluid flow from said condenser outlet to said compressor in response to said sensed temperature of said compressed gas, wherein said control means include selectively actuable valve means within said fluid line, said fluid line opening into said compression chamber, and said valve means being actuable to an open position at or subsequent to when filling of said compression chamber with suction gas has been competed, and further comprising timing means for providing a signal to said control means indicating that filling of said compression chamber with suction gas has been completed.
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22. In a refrigeration system including a compressor having a suction manifold and a discharge chamber, a condenser, and an evaporator connected to said compressor in a serial closed loop system, improved means for preventing overheating of said compressor comprising sensor means within said discharge chamber of said compressor and in the flowpath of said compressed gas for sensing the temperature of compressed gas therein, a fluid line connected to the outlet of said condenser and to said compressor and control means operative to selectively control fluid flow from said condenser outlet to said compressor in response to said sensed temperature of said compressed gas, wherein said compressor includes a plurality of compression chambers, an injection fluid line opening into each of said chambers, valve means provided in each of said injection fluid lines, said fluid line being connected to each of said valve means and said control means is operable to actuate selective ones of said valve means to thereby control fluid flow from said condenser outlet to selective ones of said compressor chambers.
Specification