Apparatus and method for refrigerant fluid leak prevention

• US 5,564,280 A
• Filed: 06/06/1994
• Issued: 10/15/1996
• Est. Priority Date: 06/06/1994
• Status: Expired due to Fees

• Current Assignee: Ronald W. Schilling, Vincent Miller
• Original Assignee: Ronald W. Schilling, Vincent Miller
• Inventors: Miller, Vincent, Schilling, Ronald W.
• Primary Examiner(s): Wayner, William E.
• Application Number:
  US08/254,161
• Time in Patent Office: 862 Days
• Field of Search: 62/174, 62/149, 62/84, 62/231, 62/498, 184/6.16
• US Class Current: 62/84
• CPC Class Codes: B60H 1/00585 Means for monitoring, testing or servicing the air-conditioning
• CPC Class Codes: F25B 2345/002 Collecting refrigerant from a cycle
• CPC Class Codes: F25B 2345/006 characterised by charging or discharging valves
• CPC Class Codes: F25B 45/00 Arrangements for charging or discharging refrigerant

Abstract

Apparatus and method for preventing leakage of refrigerant fluid from a closed air conditioning or refrigeration system having a sealed compressor, an evaporator, a receiver and a condenser, the apparatus including a solenoid-actuated valve for segmenting the refrigerant within the closed system away from the most leak-prone area of the system. A pump is provided for the periodic spraying of lubrication fluid onto a condenser seal to prevent drying of the seal. A containment compartment or trap is provided for catching refrigerant diverted by a diversion valve, the containment compartment having an improved high pressure relief valve, with an indicator for indicating the occurrence of a high pressure exhaust of refrigerant into the atmosphere.

Claims

1. Apparatus for preventing loss of refrigerant from, an air conditioning or refrigeration system, including a compressor, a condenser, a receiver, refrigerant expansion device, and an evaporator, the apparatus comprising a high-pressure diversion means, a trap for receiving over-pressurized refrigerant exhausted through the diversion means from said system, the diversion means remaining open, thereby allowing the trap to remain, at least one way, in communication with said system until serviced by service personnel.

2. The apparatus of claim 1, further comprising a diversion valve as the diversion means for diverting the over-pressurized refrigerant from said system to the trap, the diversion valve remaining open after diversion until said system is serviced.

3. The apparatus of claim 1, further comprising means for periodic lubrication of a compressor seal without cycling of the compressor.

4. The apparatus of claim 3, wherein the means for lubrication of the compressor seal further comprises:

a.) a pump for pumping lubricant, the pump having means for actuation without requiring the use of the air conditioning or refrigeration system;

b.) means for conveying the lubricant flowing through the pump to the area containing the compressor seal;

c.) a sump for collecting lubricant flowing out of the compressor seal area;

d.) a means for conveying the lubricant from the sump to the pump for conveyance to the area of the compressor seal.

5. The apparatus of claim 3, whereby the means for activation of the pump is the switching of an electrical switch that also calls for another non-related function.

6. The apparatus of claim 3, whereby the means for activation of the pump is a timer.

7. The apparatus of claim 1, that incorporates an improved pressure relief valve, the improvement comprising means for indicating the loss of refrigerant from the valve to the environment external to the system.

8. The apparatus of claim 1, wherein the indicator means further comprises a diaphragm securely attached over the exhaust aperture of the relief valve, rupture of the diaphragm occurring whenever the valve exhausts at a predetermined pressure, or seeps at a predetermined rate.

9. The apparatus of claim 8 that incorporates a cap that protects the diaphragm from harm external to the air conditioning or refrigeration system, absence of the cap and rupture of the diaphragm indicating a high-pressure event has occurred, presence of the cap and rupture of the diaphragm indicating seepage of the high-pressure relief valve.

10. The apparatus of claim 7 that incorporates a cap removably attached over the exhaust aperture of the pressure relief valve as an indicator means for indicating a high-pressure relief of refrigerant to the environment, absence of the cap indicating that a high-pressure event has occurred in said system.

11. The air conditioning or refrigeration system according to claim 1 whereby at least one solenoid actuated valve is installed, the purpose of the solenoid actuated valve means is the creation of at least two non-communicating segments, whereby in the event one segment develops a leak, said solenoid valve will preclude refrigerant flow to the leaking segment from the non-leaking segment, said solenoid valve being normally closed when the system is not in use curtails the loss of refrigerant to environment during seasonal shut down, the addition of other valves increasing environmental benefits.

12. The trap according to claim 1 whereby said diversion means is positioned between the receiver outlet and the evaporator inlet, said trap positioned relative to said diversion, whereby any reverse migration of refrigerant through said diversion means is in the form of vapor.

13. The trap according to claim 1 wherein the diversion means employs a component that will rupture at a predetermined pressure thereby permitting refrigerant flow into said trap.

14. The trap according to claim 1 wherein said trap is placed in series with a diversion means, the diversion means used for the diversion of over pressurized refrigerant from another trap that is in series with a diversion means provided on the system, thereby enabling pressure reduction in a more orderly fashion, and improving the possibility said system will continue to cool efficiently and in the case of air conditioning systems maintain a comfort level desired and in the case of a refrigeration system saving perishables.

15. A method for preventing release of refrigerant into the atmosphere from an air conditioning or refrigeration system having a compressor, a condenser, a receiver, a refrigerant metering device, and an evaporator, the method comprising the steps of:

a.) providing a non-reseating diversion means for the diversion of over pressurized refrigerant from the system;

b.) receiving and containing refrigerant diverted by the diversion means into a trap, the trap remaining in communication with said system until said system is serviced.

16. The method according to claim 15 whereby the trap incorporates an improved pressure relief valve for exhausting refrigerant from the trap should the trap become over pressurized, the improvement comprising means for indicating that the valve has allowed refrigerant to escape to the atmosphere.

17. The method of claim 16 whereby the indicator means is a diaphragm securely attached to the pressure relief valve exhaust aperture such that the diaphragm will rupture when said relief valve emits refrigerant from the exhaust aperture.

18. The method of claim 17 whereby a cap is removably attached to the exhaust end of the pressure relief valve, sheltering the diaphragm from harm external to the air conditioning or refrigeration system, presence of the cap and rupture of the diaphragm indicating seepage, absence of the cap and non-rupture of the diaphragm indicating removal of the cap by external forces, rupture of the diaphragm and absence of the cap indicating a high-pressure release.

19. The method of claim 16 whereby the indicator means is a cap removably attached to the pressure relief valve exhaust aperture, absence of the cap indicating a high-pressure relief, or sufficient seepage to cause the cap to be removed from said relief valve.

20. The method of claim 15, including means to lubricate the compressor seal without cycling the compressor, thereby providing lubrication of the compressor seal on a more regular basis when the air conditioning or refrigeration system is not in use, and in this manner preventing the compressor seal from drying and then leaking.

21. The method according to claim 15 whereby the diversion means and the trap are located relative to the system such that diversion of refrigerant liquid to said trap is maximized and any reverse migration of refrigerant through said diversion means is in the form of vapor.

22. The method according to claim 21 whereby valve means is incorporated into said system, the valve means normally closed when said system is not in use, said valve means creating at least two non-communicating segments when closed, the purpose being the prevention of a non-leaking segment providing refrigeration chemicals to a potential leaking segment, thereby reducing loss of said refrigeration chemicals into the atmosphere.

23. Apparatus for preventing loss of refrigeration chemicals from an air conditioning or refrigeration system including a compressor, a condenser, a receiver, a refrigerant expansion means and an evaporator, the apparatus comprising:

a) a solenoid actuated valve that is normally closed when the system is not in use, said solenoid valve used for the purpose of creating non-communicating segments in said system, thereby preventing one non-leaking segment from providing refrigeration chemicals to another potential leaking segment, hence reducing overall environmental damage;

b) a pump for pumping lubricant, the pump electrically operated when manually turned on, using an electrical circuit not associated with cooling of said system;

c) conduit means to convey lubricant from the pump to the area of the compressor seal assembly thereby moistening said compressor seal assembly;

d) a sump with conduit means for collecting excess lubricant flowing from said seal assembly area;

e) conduit means to convey lubricant from the sump to said pump for recirculation to said seal assembly.

24. Apparatus for preventing loss of refrigerant from an air conditioning or refrigeration system including a compressor, a condenser, a receiver, an expansion device and an evaporator, the apparatus comprising:

a) a solenoid actuated valve that is normally closed when the system is not in use, the solenoid valve used for the purpose of creating two non-communicating segments, thereby preventing a non-leaking segment from providing refrigerant flow to a potential leaking segment during periods when the system is not in use;

b) a trap for receiving refrigerant exhausted through a diversion means the diversion means opening at a predetermined pressure, said diversion means remaining open until serviced by service personnel, said diversion means provided to relieve pressure during a high pressure crisis in said system.

25. The system according to claim 24 that incorporates an indicating pressure relief valve wherein the indicator means comprises a diaphragm and securely attached over the exhaust aperture of the relief valve that the diaphragm will rupture at a predetermined seepage rate of refrigerant pressure from the system through said relief valve.

26. The relief valve according to claim 25 whereby a protective means is incorporated over said diaphragm, the protective means being non-hermetically sealed on the valve protects said diaphragm from harm external to the air conditioning or refrigeration system, said protective means secured on said valve whereby a predetermined force greater than that needed to rupture said diaphragm is required to cause removal of said protective means from said valve, and in this manner determination can be made that loss of refrigerant from said system was due to seepage which indicated a bad valve, or if the loss of refrigerant was due to a high pressure condition in said system.