In particular to a compressor valve which has a simplified design
The present invention relates to the design of compressor valves and in particular to a compressor valve which has a simplified design, reduced cost, improved reliability and reduced clearance volume of the valve and hence increased compressor capacity.
A plate member having concentrically arranged ring members in juxtaposed relationship with the fluid passages normally seals the passages and prevents fluid from passing therethrough. A spring plate rests upon the plate member and spring members bias the plate member against the fluid passages to maintain a sealed relationship and prevent fluid from passing therethrough.
The flat spring plate is rigidly attached to &he valve seat at two locations.When sufficient pressure is provided in the fluid flow passages or ports, it tends to bend the flat plate about the attachment points to uncover the fluid flow ports and allow the fluid to pas through the valve. There is very little movement that can take place by bending the spring plate when it is rigidly attached to and forms the plate which seals the valve seat ports. Further, the passages are not uniformly uncovered and thus fluid flow through the passages is not uniform.
The present invention overcomes the disadvantages of the prior art by providing a valve for a piston compressor which is smaller in volume than prior art valves because of its flat spring construction and which also has a movable plate member formed with flat concentric sealing members which seal corresponding ones of the fluid flow ports of the valve seat. The movable plate member is biased in that sealing position by the flat spring. The plate member is allowed to move axially toward the spring plate when sufficient pressure is developed in the fluid flow ports and thus bends or deforms at least part of the spring plate so that the fluid can move through the fluid ports.
The spring fingers bias the plate member against the valve seat and thus seal the fluid flow ports. When sufficient pressure is applied in the fluid flow ports, the plate member is forced by the fluid pressure toward the spring member and the projections on the plate member cause the spring like fingers on the spring plate to bend or flex thus allowing the entire sealing plate member to move away from all of the fluid flow ports simultaneously and uniformly and allow the pressurized fluid to pass through the valve.
A guard member surrounds the spring plate, and the sealing plate member and is attached to the valve seat to hold the entire compressor valve together as an integral unit. Guide pins extend through arms in the guard plate, the spring plate and the plate member into orifices in the valve seat to align the spring plate and the plate member and prevent them from rotating with respect to the valve seat or each other.
It is still another object of the present invention to provide at least two arms radially extending from the central portion of a spring plate with at least one spring finger extending arcuately from each of the arms to rest upon a corresponding one of the projections on the movable plate to bias the movable plate against and seal the fluid passage ports in the seat member.
The valve comprising a seat member having fluid passage ports therein, a movable plate member in contact with and controlling the flow of fluid through the ports, the plate member having at least one integrally formed projection on one side thereof, and a flat stationary spring plate having spring fingers thereon to contact the plate member projection to bias the plate member against and seal the fluid passage ports.
It is an object of the present invention to provide and improve the movable sealing plate member for a compressor valves with the sealing plate member being formed of plastic and having a plurality of flat sealing members for juxtaposed sealing engagement with a like plurality of fluid passage ports in the valve seat member and at least two projections formed on the sealing members of the plate member and extending outwardly from the plate member in a direction away from the valve seat member for receiving a spring member urging sealing members of the plate member against and sealing the fluid passage ports in the valve seat member.
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