Automatic expansion valve, pad mounted, non-piloted

Claim 2

Refrigerating apparatus for an automobile air conditioning system comprising: an evaporator with an inlet and an outlet; a tubular housing having openings connected to said evaporator inlet and evaporator outlet; wall means supported within the interior of said tubular housing for separating it into a control portion fluidly connected to said evaporator outlet and a metering portion fluidly connected to said evaporator inlet; means including a condenser and an inlet opening in said tubular housing for fluidly connecting said metering portion with the high pressure outlet of a compressor; means including an outlet opening in said tubular housing for fluidly connecting said control portion with the low pressure inlet of the compressor; a valve seat member supported within the interior of said tubular housing and separating said inlet opening and said evaporator inlet having a passage therein for the passage of refrigerant from said condenser to said evaporator; a valve rod with a valve member supported adjacent said passage and adapted to coact with said valve seat member for controlling the quantity of refrigerant passing through said passage into said evaporator; an elongated valve rod connected at one end to said valve member and extending form said valve member through said passage, said metering portion and said wall means into said control portion; a movable seal between said valve rod and said wall means to prevent refrigerant flow between said control and metering portions and allowing movement of said valve rod with respect to said wall means; said valve member being exposed on one end to the relatively high pressure refrigerant from the condenser which produces an opening force on said valve member; said movable seal having one surface exposed to the relatively high pressure refrigerant from the condenser which produces a closing force on said valve rod and valve member; the area of said movable seal which is exposed to high pressure refrigerant from the condenser being greater than the area of said valve member exposed which produces a resultant closing force on said valve member which increases with increasing condenser outlet pressure; a diaphragm with one side exposed to refrigerant in said control portion from said evaporator outlet and a second side exposed to a substantially constant reference pressure; means including said valve rod for operably interconnecting said diaphragm and said valve member for closing and opening said passage in response to increasing and decreasing refrigerant pressure respectively in said control portion acting against one side of said diaphragm and for opening said passage in response to decreased refrigerant pressure acting against said one side.

Claim 3

Refrigerating apparatus for an automobile air conditioning system comprising: an evaporator with an inlet and an outlet; a tubular housing having openings connected to said evaporator inlet and evaporator outlet; wall means supported within the interior of said tubular housing for separating it into a control portion fluidly connected to said evaporator outlet and a metering portion fluidly connected to said evaporator inlet; means including a condenser and an inlet opening in said tubular housing for fluidly connecting said metering portion with the high pressure outlet of a compressor; means including an outlet opening in said tubular housing for fluidly connecting said control portion with the low pressure inlet of the compressor; a valve seat member supported within the interior of said tubular housing and separating said inlet opening and said evaporator inlet having a passage therein or the passage of refrigerant from said condenser to said evaporator; a valve member supported adjacent said passage and adapted to coact with said valve seat member for controlling the quantity of refrigerant passing through said passage into said evaporator; an elongated valve rod connected at one end to said valve member and extending from said valve member through said passage, said metering portion and said wall means into said control portion; a movable seal between said valve rod and said wall means to prevent refrigerant flow between said control and metering portions and allowing movement of said valve rod with respect to said wall means; said valve member being exposed on one end to the relatively high pressure refrigerant from the condenser which produces an opening force on said valve member; said movable seal having one surface exposed to the relatively high pressure refrigerant from the condenser which produces a closing force on said valve rod and valve member; the area of said movable seal which is exposed to high pressure refrigerant from the condenser being greater than the area of said valve member exposed which produces a resultant closing force on said valve member which increases with increasing condenser outlet pressure; a diaphragm with one side exposed to refrigerant in said control portion from said evaporator outlet and a second side exposed to a substantially constant reference pressure; means including said valve rod for operably interconnecting said diaphragm and said valve member for closing said passage in response to increasing refrigerant pressure in said control portion acting against one side of said diaphragm; said valve seat member having a relatively small, continuously open bleed passage in bypass relation to said passage for supplying a minimum quantity of refrigerant to said evaporator when said passage is closed for producing cooling by the evaporator.

Claim 4

Refrigerating apparatus for an automobile air conditioning system comprising: an evaporator with an inlet and an outlet; a tubular housing having openings connected to said evaporator inlet and evaporator outlet; wall means supported within the interior of said tubular housing for separating it into a control portion fluidly connected to said evaporator outlet and a metering portion fluidly connected to said evaporator inlet; means including a condenser and an inlet opening in said tubular housing for fluidly connecting said metering portion with the high pressure outlet of a compressor; means including an outlet opening in said tubular housing for fluidly connecting said control portion with the low pressure inlet of the compressor; a valve seat member supported within the interior of said tubular housing and separating said inlet opening and said evaporator inlet having a passage therein or the passage of refrigerant from said condenser to said evaporator; a valve member supported adjacent said passage and adapted to coact with said valve seat member for controlling the quantity of refrigerant passing through said passage into said evaporator; an elongated valve rod connected at one end to said valve member and extending from said valve member through said passage, said metering portion and said wall means into said control portion; a movable seal between said valve rod and said wall means to prevent refrigerant flow between said control and metering portions and allowing movement of said valve rod with respect to said wall means; said valve member being exposed on one end to the relatively high pressure refrigerant from the condenser which produces an opening force on said valve member; said movable seal having one surface exposed to the relatively high pressure refrigerant from the condenser which produces a closing force on said valve rod and valve member; the area of said movable seal which is exposed to high pressure refrigerant from the condenser being greater than the area of said valve member exposed which produces a resultant closing force on said valve member which increases with increasing condenser outlet pressure; a diaphragm with one side exposed to refrigerant in said control portion from said evaporator outlet and a second side exposed to a substantially constant reference pressure; means including said valve rod for operably interconnecting said diaphragm and said valve member for closing said passage in response to increasing refrigerant pressure in said control portion acting against one side of said diaphragm; said valve seat member having a relatively small, continuously open bleed passage in bypass relation to said passage for supplying a minimum quantity of refrigerant to said evaporator when said passage is closed for producing cooling by the evaporator.

Claim 5

Refrigerating apparatus for an automobile air conditioning system comprising: an evaporator with an inlet and an outlet; a tubular housing having openings connected to said evaporator inlet and evaporator outlet; wall means supported within the interior of said tubular housing for separating it into a control portion fluidly connected to said evaporator outlet and a metering portion fluidly connected to said evaporator inlet; means including a condenser and an inlet opening in said tubular housing for fluidly connecting said metering portion with the high pressure outlet of a compressor; means including an outlet opening in said tubular housing for fluidly connecting said control portion with the low pressure inlet of the compressor; a valve seat member supported within the interior of said tubular housing and separating said inlet opening and said evaporator inlet forming a passage therein for the passage of refrigerant from said condenser to said evaporator; a valve member supported adjacent said passage and adapTed to coact with said valve seat member for controlling the quantity of refrigerant passing through said passage into said evaporator; an elongated valve rod connected at one end to said valve member and extending from said valve member through said passage and said wall means into said control portion; a movable seal between said valve rod and said wall means to prevent refrigerant flow between said control and metering portions and allowing lateral movement of said valve rod with respect to said wall means; said seal being exposed to high pressure refrigerant in said metering portion from said compressor to exert a closing force upon said valve member; a diaphragm with one side exposed to refrigerant in said control portion and a second side exposed to a reference pressure; means including said valve rod for operably interconnecting said diaphragm and said valve member for closing and opening said passage in response to increasing and decreasing refrigerant pressure respectively acting against the one side of said diaphragm.

Claim 6

Refrigerating apparatus for an automobile air conditioning system comprising: an evaporator with an inlet and an outlet; a tubular housing having openings connected to said evaporator inlet and evaporator outlet; wall means supported within the interior of said tubular housing for separating it into a control portion fluidly connected to said evaporator outlet and a metering portion fluidly connected to said evaporator inlet; means including a condenser and an inlet opening in said tubular housing for fluidly connecting said metering portion with the high pressure outlet of a compressor; means including an outlet opening in said tubular housing for fluidly connecting said control portion with the low pressure inlet of the compressor; a valve seat member supported within the interior of said tubular housing and separating said inlet opening and said evaporator inlet forming a passage therein for the passage of refrigerant from said condenser to said evaporator; a valve member supported adjacent said passage and adapTed to coact with said valve seat member for controlling the quantity of refrigerant passing through said passage into said evaporator; an elongated valve rod connected at one end to said valve member and extending from said valve member through said passage and said wall means into said control portion; a movable seal between said valve rod and said wall means to prevent refrigerant flow between said control and metering portions and allowing lateral movement of said valve rod with respect to said wall means; said seal being exposed to high pressure refrigerant in said metering portion from said compressor to exert a closing force upon said valve member; a diaphragm with one side exposed to refrigerant in said control portion and a second side exposed to a reference pressure; means including said valve rod for operably interconnecting said diaphragm and said valve member for closing and opening said passage in response to increasing and decreasing refrigerant pressure respectively acting against the one side of said diaphragm.