Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1998-09-23
1999-12-28
Bennett, Henry
Fluid handling
Line condition change responsive valves
Direct response valves
137855, 137857, 471571, F16K 1516
Patent
active
060067853
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a suction valve for an axial piston compressor, the cylinder block of which is covered over by a valve plate that has suction valve and discharge valve openings, having a leaf spring with one end fixed, which spring at one end is fixed with a fixed portion between valve plate and cylinder block, at its other end covers over the suction valve opening with a closure portion and has an intermediate portion connecting these portions, and also co-operates with a stop on the cylinder block as the suction valve opens.
In a known suction valve of that kind (U.S. Pat. No. 2,908,287), the fixed portion of the leaf spring with one end fixed is located close to the cylinder. The closure portion is located at the other end of the spring and co-operates with the stop. The intermediate portion therefore extends over a substantial part of the diameter of the cylinder.
When the suction valve is open and gas is to be sucked into the cylinder, the leaf spring is bent downwards. The flow of gas is here diverted from the suction valve opening to the cylinder wall. On contact with the cylinder wall the gas is heated and expands. The flow resistance and the heating reduce the amount of gas that is able to flow into the cylinder during the suction stroke of the compressor.
SUMMARY OF THE INVENTION
The invention is based on the problem of providing a suction valve of the kind described in the introduction, which allows optimum filling of the cylinder and thus increases the efficiency of the compressor, as is desirable in particular for refrigeration compressors.
That problem is solved according to the invention in that the intermediate portion is located substantially outside the cylinder cross-section and the stop is arranged in the region of the cylinder wall facing the fixed portion.
In this construction, at the start of the opening movement the characteristic is weak, because the leaf spring is able to deform over the length of the intermediate portion and the closure portion. As soon as the stop is reached, however, the opening characteristic becomes stiffer, because only the closure portion can still move. The new suction valve can therefore open more quickly and wider than the suction valves known to date. Filling of the cylinder during the suction stroke of the compressor is thus increased. Conversely, in the fully open position the suction valve closes more quickly because of the considerable stiffness and thus prevents backflow. This also increases the filling and thus the efficiency of the compressor. Moreover, it is possible to match the individual portions of the leaf spring accurately to the application, that is, the fixed portion to the fixing function, the intermediate portion to the bending function and the closure portion to the closing function. In this manner a valve is obtained which combines the advantages of a rigid valve and of a non-rigid valve.
Moreover, the closure portion forms with the valve plate an angle of which the apex lies close to the cylinder wall and which widens towards the middle of the cylinder. Gas consequently flows directly towards the middle of the cylinder, without first having to be deflected from the cylinder wall. This leads to a decrease in heating of the gas and therefore likewise to an improvement in the degree of fill.
An improvement is also achieved during the pressure stroke. A relatively large discharge valve opening can now be provided, without the gas discharged by way of the discharge valve being obstructed by the leaf spring of the suction valve, since substantially only the closure portion is located in the cylinder chamber.
In a preferred construction, provision is made for the end face of the cylinder block to have a recess for receiving the intermediate portion, which recess is bounded by an inclined ramp leading to the cylinder. The ramp enables the fixed portion to be arranged at a spacing from the cylinder yet still enables the intermediate portion to be movable. The stop is formed by means of the ramp.
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Bennett Henry
Danfoss Compressors GmbH
Kim Joanne Y.
LandOfFree
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