Patent US3766745A successfully refreshed from Google Patents.
US3766745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system with plural evaporator means
Assignee: Individual
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Filing: 1971-10-04
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Granted: 1973-10-23
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Expires: 1991-10-04
Abstract
Abstract A refrigeration system particularly adapted for supermarkets and the like employing a multiplicity of refrigerated fixtures or storage rooms operating at varying load requirements wherein centrally located compressors operate all of the evaporators which may include evaporators functioning at different temperature levels from approximately freezing to substantially below freezing. The various embodiments of the refrigeration system employ a separate compressor operating at a relatively high suction pressure which produces an intermediate refrigerant evaporation temperature far below the temperature of the condensed refrigerant in the main refrigeration system and approaching the temperatures of the evaporators of the system. In each embodiment the relatively high suction pressure and intermediate temperature developed by the separate compressor is employed for reducing the temperature of the condensed refrigerant of the main refrigeration system to that intermediate temperature before supplying same to the evaporators of the refrigerated fixtures with some of the embodiments employing direct communication between the separate compressor suction and the supply of refrigerant and others employing indirect communication by heat exchanger means. The separate compressor operates at a very efficient level and thereby increases the overall efficiency and the operational characteristics of the refrigeration system.
Inventors
- 👤 L Quick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:26
CPC Classifications
F; F25; F25B; F25B5/00; F25B1/00; F25B41/00; F25B41/20; F25B47/00; F25B47/02; F25B47/022; F25B7/00; F25B2400/00; F25B2400/07; F25B2400/075; F25B2400/13; F25B2400/16; F25B2400/22; F25B2400/23; F25B2700/00; F25B2700/19; F25B40/00; F25B40/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
149 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, a separate vessel forming a chamber for receiving the liquid refrigerant from said receiver, a pressure reducing valve between said receiver and said chamber, and means employing the suction of said compressor means at a relatively high pressure level connected to said chamber to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant in said chamber being supplied to said evaporator means to a temperature below both the condensing temperature and above the temperature maintained by said evaporator means.
Claim 2
Dependent Claim
149 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, a separate vessel forming a chamber for receiving the liquid refrigerant from said receiver, a pressure reducing valve between said receiver and said chamber, and means employing the suction of said compressor means at a relatively high pressure level connected to said chamber to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant in said chamber being supplied to said evaporator means to a temperature below both the condensing temperature and above the temperature maintained by said evaporator means.
Claim 3
Dependent Claim
181 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receIver means for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means including a chamber through which all of the condensed refrigerant passes, means employing the suction of said compressor means at a relatively high pressure level connected to said chamber to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant in said chamber being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means, means provided for defrosting the evaporator means by passing hot gaseous refrigerant therethrough, and means for conducting the defrosting refrigerant from the evaporator means to said chamber for separating gaseous and liquid refrigerant and returning the liquid refrigerant to the refrigerating cycle.
Claim 4
Dependent Claim
181 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receIver means for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means including a chamber through which all of the condensed refrigerant passes, means employing the suction of said compressor means at a relatively high pressure level connected to said chamber to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant in said chamber being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means, means provided for defrosting the evaporator means by passing hot gaseous refrigerant therethrough, and means for conducting the defrosting refrigerant from the evaporator means to said chamber for separating gaseous and liquid refrigerant and returning the liquid refrigerant to the refrigerating cycle.
Claim 5
Dependent Claim
167 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, a heat exchanger through which the liquid refrigerant passes from said receiver to said evaporator means, and means comprising a completely separate closed cycle refrigeration system having a compressor, condenser, receiver and evaporator coil with the evaporator coil forming one separate portion of the heat exchanger, said separate compressor operating at a relatively high suction pressure level for reducing the temperature of all of the liquid refrigerant passing through the heat exchanger and being supplied to said system evaporator means to a temperature below both the condensing temperature and room temperature but above the temperature maintained by said evaporator means.
Claim 6
Dependent Claim
167 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, a heat exchanger through which the liquid refrigerant passes from said receiver to said evaporator means, and means comprising a completely separate closed cycle refrigeration system having a compressor, condenser, receiver and evaporator coil with the evaporator coil forming one separate portion of the heat exchanger, said separate compressor operating at a relatively high suction pressure level for reducing the temperature of all of the liquid refrigerant passing through the heat exchanger and being supplied to said system evaporator means to a temperature below both the condensing temperature and room temperature but above the temperature maintained by said evaporator means.
Claim 7
Dependent Claim
134 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, and means employing said compressor means both for reducing the pressure of the supply of liquid refrigerant to a constant value substantially below the head pressure produced by said compressor means and for reducing the temperature of all the liquid refrigerant being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means.
Claim 8
Dependent Claim
134 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, and means employing said compressor means both for reducing the pressure of the supply of liquid refrigerant to a constant value substantially below the head pressure produced by said compressor means and for reducing the temperature of all the liquid refrigerant being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means.
Claim 9
Dependent Claim
50 words
The refrigeration system of claim 4 wherein the means for reducing the liquid refrigerant temperature includes a chamber through which all of the condensed refrigerant passes, and said suction of the compressor means is connected to said chamber for causing said evaporation of some refrigerant to cool the remaining liquid.
Claim 10
Dependent Claim
27 words
The refrigeration system of claim 4 wherein said temperature reduction of the liquid refrigerant is approximately one-half of the temperature differential between condensing temperature and evaporator temperature.
Claim 11
Dependent Claim
29 words
The refrigeration system of claim 4 wherein said compressor means includes a separate and independently operating compressor having its suction operating said means for reducing the liquid refrigerant temperature.
Claim 12
Dependent Claim
57 words
The refrigeration system of claim 7 wherein said means for reducing the temperature and pressure of the liquid refrigerant includes the receiver with said separate compressor suction connected to the receiver, means for passing only liquid refrigerant from the condenser means to the receiver, and means for controlling the pressure in said receiver to said constant value.
Claim 13
Dependent Claim
229 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, and means employing the suction of said compressor means at a relatively high pressure level to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means, said the multiplicity of evaporator means being operated on at least two different temperature levels and the means for reducing the liquid refrigerant temperature including at least two separate chambers through which the condensed liquid refrigerant passes consecutively, said suction of the compressor means being connected to said chambers for causing evaporation of some refrigerant to cool the remaining liquid refrigerant to two different temperatures, the higher temperature being maintained in the first chamber with the liquid refrigerant therefrom being supplied to the higher temperature evaporator means and to the second chamber, and the colder liquid refrigerant from said second chamber being supplied to the remaining evaporator means.
Claim 14
Dependent Claim
229 words
In a closed cycle refrigeration system for a multiplicity of refrigerated fixtures, comprising a like multiplicity of evaporator means associated with and cooling the fixtures, compressor means for compressing the evaporated refrigerant, condenser means for condensing the refrigerant to a liquid at a temperature substantially above room temperature, a receiver for maintaining a supply of liquid refrigerant for the variable demand of said multiplicity of evaporator means, and means employing the suction of said compressor means at a relatively high pressure level to evaporate some refrigerant for reducing the temperature of all the liquid refrigerant being supplied to said evaporator means to a temperature below both the condensing temperature and room temperature and above the temperature maintained by said evaporator means, said the multiplicity of evaporator means being operated on at least two different temperature levels and the means for reducing the liquid refrigerant temperature including at least two separate chambers through which the condensed liquid refrigerant passes consecutively, said suction of the compressor means being connected to said chambers for causing evaporation of some refrigerant to cool the remaining liquid refrigerant to two different temperatures, the higher temperature being maintained in the first chamber with the liquid refrigerant therefrom being supplied to the higher temperature evaporator means and to the second chamber, and the colder liquid refrigerant from said second chamber being supplied to the remaining evaporator means.
Claim 15
Dependent Claim
25 words
The refrigeration system of claim 9 wherein the compressor means includes a separate and independently operating compressor having its suction connected to said first chamber.
Claim 16
Dependent Claim
38 words
The refrigeration system of claim 10 wherein said compressor means includes separate compressor operating the evaporator means at different temperature levels, and compressor operating said higher temperature evaporator means has its suction also connected to said second chamber.
Claim 17
Dependent Claim
26 words
The refrigeration system of claim 10 wherein the compressor means includes a second separate and independently operating compressor having its suction connected to said second chamber.
Claim 18
Dependent Claim
40 words
The refrigeration system of claim 12 wherein a third chamber and third separate compressor operating same are provided and connected downstream of said second chamber for providing even colder liquid refrigerant to the evaporator means operating at the coldest temperature.
Claim 19
Dependent Claim
113 words
In a refrigeration system having compressor means, condenser-receiver means and evaporator means with a substantial temperature range differential between the high temperature of the liquid refrigerant resulting in said condenser-receiver means and the low refrigerant temperature maintained in the evaporator means, the improvement comprising, a separate and independent compressor means operating at a relatively high suction pressure for evaporating refrigerant at a temperature intermediate such temperature range differential, and means employing the suction of said separate compressor means in association with the high temperature liquid refrigerant for reducing the temperature and pressure of that refrigerant to substantially said intermediate temperature and to a substantially constant pressure before supplying same to the evaporator means.
Claim 20
Dependent Claim
113 words
In a refrigeration system having compressor means, condenser-receiver means and evaporator means with a substantial temperature range differential between the high temperature of the liquid refrigerant resulting in said condenser-receiver means and the low refrigerant temperature maintained in the evaporator means, the improvement comprising, a separate and independent compressor means operating at a relatively high suction pressure for evaporating refrigerant at a temperature intermediate such temperature range differential, and means employing the suction of said separate compressor means in association with the high temperature liquid refrigerant for reducing the temperature and pressure of that refrigerant to substantially said intermediate temperature and to a substantially constant pressure before supplying same to the evaporator means.
Claim 21
Dependent Claim
141 words
In a refrigeration system the combination of a first compressor means, a condenser, a receiver, and a plurality of evaporator means all connected in a closed cycle with the liquid refrigerant resulting in said condenser normally having a high temperature substantially above room temperature and said evaporator means operating at temperatures near or below freezing, valve means connected between said condenser and said receiver for permitting only liquid refrigerant to flow to said receiver, a separate continuously operating compressor means haVing the suction connected to said receiver for producing a relatively high suction pressure and refrigerant evaporation temperature for reducing the temperature and pressure of the liquid refrigerant in said receiver to below room temperature and to a substantially constant pressure, and said separate compressor means having its discharge connected to said condenser for returning the refrigerant to said closed cycle.
Claim 22
Dependent Claim
141 words
In a refrigeration system the combination of a first compressor means, a condenser, a receiver, and a plurality of evaporator means all connected in a closed cycle with the liquid refrigerant resulting in said condenser normally having a high temperature substantially above room temperature and said evaporator means operating at temperatures near or below freezing, valve means connected between said condenser and said receiver for permitting only liquid refrigerant to flow to said receiver, a separate continuously operating compressor means haVing the suction connected to said receiver for producing a relatively high suction pressure and refrigerant evaporation temperature for reducing the temperature and pressure of the liquid refrigerant in said receiver to below room temperature and to a substantially constant pressure, and said separate compressor means having its discharge connected to said condenser for returning the refrigerant to said closed cycle.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |