| Cylinder head arrangement for a piston compressor -> Monitor Keywords |
|
|
 
Cylinder head arrangement for a piston compressorCylinder head arrangement for a piston compressor description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070196217, Cylinder head arrangement for a piston compressor. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS REFERENCE TO RELATED APPLICATIONS [0001]Applicant hereby claims foreign priority benefits under U.S.C. .sctn.119 from German Patent Application No. 10 2006 008 867.0 filed on Feb. 21, 2006, the contents of which are incorporated by reference herein. FIELD OF THE INVENTION [0002]The invention concerns a cylinder head arrangement for a piston compressor, with a cylinder block, in which a compression chamber is formed, which is delimited on one side by a valve plate that is clamped between the cylinder block and a cylinder head cover. BACKGROUND OF THE INVENTION [0003]From the German patent document DE 199 15 918 C2 is known a compressor, in which the end faces of the cylinder head, the top and bottom sides of the valve plate, as well as the sealing face of the cylinder head cover are made to be plane. The individual components are joined by means of screw bolts using flat gaskets as intermediate layers. The known compressor could, for example, be a refrigerant compressor. During operation, conditions may occur in refrigerant compressors, in which the discharge side pressure under the cylinder head cover increases heavily. This can, for example be caused by restrictions or even blocking of pipes or by decreased heat dissipation at a condenser of a corresponding refrigeration system. In order to avoid leakages or damage of sealing gaskets in such cases, the components must be held together by large tightening forces. On the one hand, this places heavy demands on the mounting process and the material properties of the bolts. On the other hand deformations of the cylinder may occur, as the bolts are screwed into the cylinder head in the immediate vicinity of the cylinder. This increases the risk of leakages through the piston-cylinder gap, which again reduces the efficiency of the compressor. [0004]As the tightening bolts are located in the edges of the substantially rectangular cylinder head, an increased pressure in the compression chamber may cause a sagging of a centre area of the valve plate away from the compression chamber. This reduces the compression surface and the surface pressure, which may cause failure of the gasket. To prevent this problem, the sealing surface of the cylinder head cover may have a slightly convex shape, so that the central area of the cover sealing surface is pressed harder against the valve plate. A deflection of the valve plate in the direction of the cylinder caused by this prestressing can be compensated by a somewhat thicker gasket between the valve plate and the cylinder block. This will also cause a slight increase of the dead volume of the compressor. Further, the manufacturing of a cover with a convex sealing surface is expensive. [0005]It is possible to provide the convex sealing surface of such a cylinder head cover with a circumferential bead to increase the surface pressure in the first gasket and to equalise possible manufacturing tolerances. However, this will still require large tightening forces of the mounting bolts to ensure a sufficient sealing by the second gasket between the cylinder block and the valve plate. Usually, cylinder head covers for refrigerant compressors are made as aluminium castings. A bead in such a component can, however, easily be damaged during handling in the assembly process, as the material is relatively soft. SUMMARY OF THE INVENTION [0006]The task of the invention is to provide a cylinder head arrangement according to the preamble of claim 1, which has a high degree of tightness and can be manufactured in a cost effective manner. [0007]With a cylinder head arrangement for a piston compressor, with a cylinder block, in which a compression chamber is formed, which is delimited on one side by a valve plate that is clamped between the cylinder block and a cylinder head cover this task is solved in that on at least one side the valve plate has at least one bead projecting from the valve plate surface concerned. This bead will substantially increase the surface pressure on the valve plate. Thus, also with high pressures a reliable sealing can also be ensured with relatively small tightening forces. Further, an expensive grinding of the valve plate surface concerned can be avoided. [0008]A preferred embodiment of the cylinder head arrangement is characterised in that the bead extends along a closed line. The bead does not have to be completely closed. It could also be effective when being interrupted by small openings. However, it could be advantageous for the bead to be completely closed. [0009]A further preferred embodiment of the cylinder head arrangement is characterised in that both sides of the valve plate have a bead projecting from the corresponding valve plate surface, the beads extending along a substantially closed line. This, for example, offers the advantage that an increased surface pressure is generated in both gaskets. Further, cylinder head covers with a plane sealing surface can be used. [0010]A further preferred embodiment of the cylinder head arrangement is characterised in that the valve plate is made as a sintered part. Manufacturing by sintering gives the advantage that the shaping of the valve plate with the bead or the beads is made relatively simply already when pressing the unsintered valve plate workpiece and a subsequent grinding of the valve plate can be avoided. Preferably, the valve plate is made of sinter metal. [0011]A further preferred embodiment of the cylinder head arrangement is characterised in that at least on one side, particularly on both sides, the valve plate has at least one, particularly several spacer pieces. The spacer pieces serve the purpose of preventing a caking of the pressed, unsintered valve plate workpieces during the sintering process, during which several plates are stacked. [0012]A further preferred embodiment of the cylinder head arrangement is characterised in that the spacer piece(s) project(s) somewhat more from the corresponding valve plate surface in question than the related bead. A slightly higher spacer piece compared to the bead will reliably prevent a caking of the valve plates during the sintering. In case the spacer pieces are located in the area of gaskets or beads, it is advantageous to provide recesses in the bead or the gasket to adopt the spacer piece. Alternatively, the spacer pieces can be deformed in the area of the beads or gaskets after the sintering, so that their height is smaller than the height of the beads. [0013]A further preferred embodiment of the cylinder head arrangement is characterised in that several through-holes are made in the valve plate. The through-holes have different functions, and for example serve the purpose of passing a medium into the compression chamber or out of the compression chamber. Further, the through-holes can serve as insertion holes for positioning or fixing elements. [0014]A further preferred embodiment of the cylinder head arrangement is characterised in that a valve seat of a suction valve and a valve seat of a discharge valve are impressed in the valve plate. Preferably, both the suction valve and the discharge valve are fixed to the valve plate. [0015]A further preferred embodiment of the cylinder head arrangement is characterised in that a gasket is located between the valve plate and the cylinder block and between the valve plate and the cylinder head cover, respectively. With very small working efforts, the combination of bead and gasket will provide a high degree of tightness. [0016]A further preferred embodiment of the cylinder head arrangement is characterised in that the extension of the bead perpendicularly to the belonging valve plate surface is smaller than the thickness of the gasket concerned. This prevents an unwanted cutting of the gasket. [0017]A further preferred embodiment of the cylinder head arrangement is characterised in that the extension of the bead perpendicularly to the belonging valve plate surface is 5 to 75%, particularly 25 to 50% of the thickness of the gasket concerned. In connection with the invention concerned, these values have proved to be particularly advantageous. [0018]A further preferred embodiment of the cylinder head arrangement is characterised in that on the valve plate surface facing the cylinder block the bead surrounds a projection of the opening of the compressing chamber on this valve plate surface. This prevents an unwanted escape between the valve plate and the cylinder block of medium from the compressing chamber. [0019]A further preferred embodiment of the cylinder head arrangement is characterised in that on the valve plate surface facing the cylinder block the bead surrounds at least one suction opening and at least one discharge opening. The openings belong to through-holes which permit passage of the medium into the compressing chamber and out of the compressing chamber. [0020]A further preferred embodiment of the cylinder head arrangement is characterised in that on the valve plate surface facing the cylinder head cover the bead surrounds a projection of the opening of a discharge chamber on this valve plate surface. This will prevent an unwanted escape between the valve plate and the cylinder head cover of medium from the discharge chamber. Continue reading about Cylinder head arrangement for a piston compressor... Full patent description for Cylinder head arrangement for a piston compressor Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Cylinder head arrangement for a piston compressor patent application. Patent Applications in related categories: 20090290996 - Bent axis type variable displacement pump/motor - The present invention relates to an improvement of an bent axis type variable displacement pump/motor in which a piston moves reciprocatingly inside a cylinder and a state in which three parties of a cylinder block, a valve plate member, and a case are always in close contact with each other ... 20090290997 - Reduced flow pulsations in a tandem floating cup pump with an odd number of pistons - A method for reducing the flow pulsations in a tandem floating cup pump having an odd number of pistons includes determining a low noise net index angle that produces reduced flow pulsations relative to those produced when the net index angle is either zero or half the separation angle and ... ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Cylinder head arrangement for a piston compressor or other areas of interest. ### Previous Patent Application: Wobble plate compressor Next Patent Application: Cord like manager and cord like manager kit Industry Class: Pumps ### FreshPatents.com Support Thank you for viewing the Cylinder head arrangement for a piston compressor patent info. IP-related news and info Results in 0.96111 seconds Other interesting Feshpatents.com categories: Electronics: Semiconductor , Audio , Illumination , Connectors , Crypto , 174 |
 * Protect your Inventions * US Patent Office filing 
PATENT INFO |
|
