DE102010034409A1 - Air compressor in piston-/cylindrical configuration comprises crankcase, cylinders with respective piston present in air compressor, and piston that is movable back and forth into cylinder, which is connected with cylinder head - Google Patents

Abstract

The air compressor (20) in piston-/cylindrical configuration comprises a crankcase (24), cylinders (27, 28) with the respective piston present in the air compressor, and a piston (29, 30) movable back and forth into the cylinder, which is connected with a cylinder head (31) that limits a compression space (35) formed between the piston and the cylinder in a region of top dead point of the piston. An air-conducting channel present in the cylinder head and other components movable from an air flow around the components in the cylinder head are directly provided with the catalytic coating. The air compressor (20) in piston-/cylindrical configuration comprises a crankcase (24), cylinders (27, 28) with the respective piston present in the air compressor, and a piston (29, 30) movable back and forth into the cylinder, which is connected with a cylinder head (31) that limits a compression space (35) formed between the piston and the cylinder in a region of top dead point of the piston. An air-conducting channel present in the cylinder head and other components movable from an air flow around the components in the cylinder head are directly provided with the catalytic coating. The air compressor is provided with an air flow through channel or the compressed air coming in contact with the components of the catalytic coating. A pressure outlet valve of the air compressor and a part of a manifold or a cylinder cover of the cylinder head are directly provided with the catalytic coating. A common cylinder head is provided for both cylinders.

Description

The invention relates to a compressed air compressor in piston / cylinder design according to the preamble of claim 1.

Such air compressors are usually operated with an oil lubrication. The oil leads, especially at high temperatures, in the air compressor after prolonged operation to deposits of oil and carbon in the cylinder head of the compressor. The aim of the present invention is an avoidance or at least a reduction of such deposits.

From the DE 10 2008 014 205 A1 The proposal is already known to integrate a catalyst in a pneumatic compressor. For this purpose, an additional receiving block is proposed, which is installed as a further component between the cylinder head and the rest of the cylinder block. The receiving block contains a catalyst. However, such a separate receiving block can not prevent deposition of oil and carbon on other parts of the cylinder head.

Therefore, it is an object of the present invention to provide a solution to the problem of deposition of oil and carbon on cylinder head parts of the air compressor.

This object is achieved by the invention defined in claim 1. The subclaims indicate advantageous embodiments of the invention.

There have also been considerations in the past to avoid or reduce deposits of oil and carbon in the cylinder head. However, this problem could not be solved satisfactorily, especially in the area of reciprocating compressors. Previous proposals to provide a PTFE coating have proved to be insufficiently useful, since a deposition of oil and carbon in the cylinder head is not reliably prevented. In compressed air compressors in piston / cylinder design, particularly difficult conditions occur in the region of the cylinder head where particularly high temperatures are produced in continuous operation, in particular in the lower part of the cylinder head, which is also called Manifold, and in the region of the exhaust valve. As Manifold an area with a plurality of spiral flow channels in the cylinder head of the air compressor is called.

The invention has the advantage that deposits of oil and carbon in the cylinder head are largely avoided. In this way, an undesired blocking of the cylinder head by the deposits can be avoided. This has the further advantage that a reduction of the outlet or throughflow cross section occurring in the cylinder head as a result of blockage can likewise be avoided. As a result, the pressure nozzle temperature over a long period of operation of the air compressor, in particular over the life of the specification specs, be kept at a nearly constant level. This can increase the overall service life of the air compressor.

The invention is particularly suitable for compressed air compressors with a pressure outlet valve in lamella design.

According to the invention, at least one air-conducting channel in the cylinder head is at least partially provided directly with the catalytic coating. According to an advantageous development of the invention, other components, which are surrounded by air, are additionally provided in the cylinder head, at least in part, directly with the catalytic coating. Advantageously, in particular movable components such. As the pressure outlet valve, be provided with the catalytic coating. It is also advantageous to provide parts of the manifold directly with the catalytic coating.

According to an advantageous development of the invention, the catalytic coating contains an alkali metal oxide and / or a rare earth alkali oxide. Particularly advantageous compositions of the catalytic coating are further specified in the subclaims 8 to 10.

The invention will be explained in more detail using an exemplary embodiment using drawings.

Show it:

1 - An air compressor in a side, partially cut view and

2 - Components of the cylinder head of the air compressor according to 1 in exploded view.

In the figures, like reference numerals are used for corresponding elements.

The 1 shows an air compressor according to the invention 20 in the form of a two-cylinder reciprocating compressor. The air compressor 20 has a crankcase 24 in which a crankshaft 26 is arranged. Above the crankcase 24 there is a cylinder block 25 , the two cylinders 27 . 28 and each disposed therein pistons 29 . 30 having. Above the cylinder block 25 there is a cylinder head 31 ,

The crankshaft 26 is over connecting rod with the pistons 29 . 30 connected. In the in 1 view shown is the right piston 29 at top dead center, the left piston 30 is at bottom dead center. As can be seen, the cylinder head limits 31 between the respective piston 29 . 30 and the cylinders 27 . 28 of the cylinder block 25 formed compression space 35 ,

The air compressor 20 is from an external unit, for. B. a drive motor of a vehicle, via the crankshaft 26 driven.

The cylinder head 31 has a manifold 32 and a cylinder cover 36 on. The manifold 32 is, if necessary with a seal, directly on the cylinder block 25 appropriate. On the manifold 32 is the cylinder cover 36 attached, z. B. by means of screws 44 , Between the manifold 32 and the cylinder cover 36 may still be different seals and intermediate plates, as follows from the 2 explained.

In the cylinder cover 36 there is an intake air inlet 38 , is sucked through the air from the atmosphere. Furthermore, in the cylinder cover 36 a compressed air outlet 42 provided, via the compressed air from the air compressor 20 is dissipated. Furthermore, a possibility for water cooling is provided. For this purpose, the cylinder cover 36 a cooling water inlet 40 on. In the manifold 32 is a cooling water outlet 34 intended.

The 2 shows the individual parts of the cylinder head 31 , Visible is the manifold 32 , a first seal 46 , a second seal 50 , an intermediate plate 48 , a third seal 52 as well as the cylinder cover 36 , Here is the manifold 32 for example, with the arrows 1 . 2 designated points directly provided with a catalytic coating.

The cylinder cover 36 is in the 2 additionally shown in a rotated by 180 ° view, so to speak in a view from below. As can be seen there, the cylinder cover 36 at the with the arrow 3 designated spot directly provided with the catalytic coating.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102008014205 A1 [0003]

Claims (10)

Compressed air compressor ( 20 ) in piston / cylinder design, with a crankcase ( 24 ), at least one cylinder ( 27 . 28 ) and one in the cylinder ( 27 . 28 ) reciprocating pistons ( 29 . 30 ), whereby the cylinder ( 27 . 28 ) with a cylinder head ( 31 ), one between pistons ( 29 . 30 ) and cylinders ( 27 . 28 ) compression space ( 35 ) in the region of top dead center of the piston ( 29 . 30 ), characterized in that at least one air-conducting channel ( 1 . 2 . 3 ) in the cylinder head ( 31 ) is at least partially provided directly with a catalytic coating. Compressed air compressor according to claim 1, characterized in that other, flowed around by air components in the cylinder head ( 31 ), in particular movable components, at least in part directly provided with the catalytic coating. Compressed air compressor according to one of the preceding claims, characterized in that only with the compressed air compressor ( 20 ) compressed air flow channels ( 1 . 2 . 3 ) or components in contact with the compressed air are provided with the catalytic coating. Compressed air compressor according to one of claims 2 or 3, characterized in that at least one pressure outlet valve of the compressed air compressor ( 20 ) is at least partially provided directly with the catalytic coating. Compressed air compressor according to one of the preceding claims, characterized in that at least parts of a manifold ( 32 ) or a cylinder cover ( 36 ) of the cylinder head ( 31 ) are provided with the catalytic coating. Compressed air compressor, characterized in that the compressed air compressor ( 20 ) at least two cylinders ( 27 . 28 ) each having a piston therein ( 29 . 30 ), wherein a common cylinder head ( 31 ) for both cylinders ( 27 . 28 ) is provided. Compressed air compressor according to one of the preceding claims, characterized in that the catalytic coating contains an alkali metal oxide and / or rare earth alkali oxide. Compressed air compressor according to one of the preceding claims, characterized in that the catalytic coating comprises at least one oxide of a transition metal or an oxide of a mixture of transition metals, wherein the transition metals elements of groups IB, in particular Cu, Ag, Ag, II B, in particular Zn, C , Hg, III B, in particular Sc, Y, IV B, in particular Ti, Zr, Hf, VB, in particular V, Nb, Ta, VI B, in particular Cr, Mo, W, VII B, in particular Mn, Tc, Re and or VIII B, in particular Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt. Compressed air compressor according to claim 8, characterized in that it is the transition metal or the mixture of transition metals to elements of the groups of the 4th period, in particular Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and / or the groups of the 5th period, in particular Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag, Cd, in particular TiZrNi. Compressed air compressor according to one of claims 1 to 7, characterized in that the catalytic coating comprises an oxide of a mixture of at least one transition metal and at least one metal, in particular Al, and / or semimetal, in particular Si, wherein the transition metals elements of groups IB, in particular Cu, Ag, Ag, IIB, in particular Zn, Cd, Hg, IIIB, in particular Sc, Y, IVB, in particular Ti, Zr, Hf, VB, in particular V, Nb, Ta, VIB, in particular Cr, Mo, W, VII B, in particular Mn, Tc, Re and / or VIII B, in particular Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt.

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