DK2363606T3

DK2363606T3 - A compressor valve for controlling a stamping machine

Info

Publication number: DK2363606T3
Application number: DK10005035T
Authority: DK
Inventors: Peter Rausch
Original assignee: Borsig Compressor Parts Gmbh
Priority date: 2009-05-18
Filing date: 2010-05-12
Publication date: 2014-03-17
Also published as: EP2363606B1; EP2363606A3; RU2010119711A; DE102009021814A1; EP2363606A2

Description

DESCRIPTION

The invention relates to a compressor valve for controlling a piston machine for the inlet of a gas into the working chamber or for the outlet of a gas out of the working chamber of the piston machine having at least one valve seat* one valve retainer and one sealing element.

From DE 100 10 566 A1 a compressor is known having a valve mechanism, in which a gas passage is formed, which comprises a first and second end portion for passing through a gaseous fluid, which are located opposite one another» A valve seat element is press-fitted into the first end portion of the gas passage, and a valve .chamber is thus defined in this manner, A valve body for preventing a backflow of the gaseous fluid when the valve body contacts the valve seat element is moveably arranged in the valve chamber. On the second end of the gas passage, a valve stop for preventing shifting of the 'valve body is provided, wherein tile gas passage is net closed. in addition, an air or gas compressor is known from GB 2S3 654 A, which is designed with a series of small, separate independent openings from the suction passage. Here, the openings are arranged in a circle with larger diameter than the inner diameter of the cylinder in the cylinder head or about the cylinder end with a smell light suction valve that is provided on each opening, The suction valves are fitted into recesses in. the cylinder end and ate upwardly held against a seat on the lower aids of the cylinder head by springs.

From. FR 1 091 988 A a compressor is known, which uses a ball as sealing element which is stabilised on its valve seat via a spring. The: spring is accommodated in a recess in the valve retainer. furthermore, a bail valve is known from DS 196 25 646 Al, which comprises a housing,, a ball and a hush. In the bush, an inner collar each protruding radially to the inside is provided, which comprises an annular groove the bottom of which is located in a radial plane, into which an annular seat is inserted. On the side located opposite the bottom of the annular groove a collar web is formed on the inner collar, which can be bent over against the annular seat so that the latter is fixed on the annular groove by the bent-over collar web. Because of this, a deformation of the annular seat is prevented when the ball valve is exposed to high pressures and temperatures.

From EF 1 4 DO 690 A2 a non-return valve for vacuum pumps with a valve housing is additionally known, which forms a passage channel with an inlet end and an outlet end. Here, the valve comprises an elastomeric insert, which is arranged in the valve housing between the inlet end and the outlet end and forms a valve seat. In addition, a ball is provided which is arranged so that said ball contacts: the valve seat in order to prevent the passage of gaseous media from the outlet end to the inlet end. During the operation, the ball is displaceable from, the valve seat through a gaseous pressure-loaded medium, in order to allow the passage of the gaseous medium from the inlet end to the outlet end.

Working valves which are inserted in piston compressors are subject to severe dirt accumulation through contaminated gases, deposits and oil ns' due and the abrasion from piston rings and guide rings,

Annular valves and poppet valves with profile valve elements are suitable for use under the aggravated conditions because a better flow and sealing than, with a plate valve can be expected because of the ring geometry«

Through the inflow of the sealing elenuuu. a, these are exposed to a rotary movement and are thus subjected to seif-cleaning.

Disadvantageous with the self-cleaning is that through the rotary movement about the centre axis the sealing elements are substantially subjected to load at one point on. the circumference. Thus, wear primarily occurs always at the same point on the circumference of the sealing element, since there is only one degree of freedom.

The invention is. based, on the object of creating a compressor valve for a piston machine, in particular a compressor or a vacuum pump, in which the respective sealing element has multiple degrees: of freedom,, so that there is even wear with the respective- sealing element and sticking because of severe dirt accumulation: through contaminated gases, through deposits and. oil. residue and the. abrasion from piston rings and guide rings is reduced and a better seal is achieved and simple and cost-effective production, repair and maintenance is possible.

According to the invention, the object is solved through a compressor valve having the features of Patent Claim 1.

It has been proved to be advantageous when a sealing element in a spherical shape is used. Here, the sealing element is arranged between the valve seat and the valve retainer, wherein the valve seat and the valve retainer are embodied in two parts. The sealing element rests in. the valve seat on a seat strip, which is eireimf ©rent ial ly provided at an end of a collar bush, or bore in the valve seat. In the valve retainer, the sealing element is held in a receptacle which is provided at an end of the valve retainer.

Of special advantage is that the seat strip on the collar bush or bore is foraed profiled, In addition to this, the seat strip is formed with a predetermined angle as a function of the diameter of the sealing element and diameter of the collar .bush or bore. Because of the matching of the seat strip to the diameter of the sealing element, a sealing of the sealing element which is always in the middle on the seat strip is ensured, so that the sealing element is always located in the middle in a stable working position. ft is advantageous, furthermore, that the sealing element has a line contact on the collar bush or the bore with the seat strip, wherein the line contact of the sealing element is connected with a greater tightness of the valve and reduces sticking of the sealing element.

For receiving the sealing element in the valve retainer, a geometrical shape which is adapted to the shape of the sealing element is advantageous.

It has proved to be an advantage furthermore when the valve retainer is equipped with a bush, in which a spring is accommodated, which is in engagement with the sealing element with a predetermined tension.

Further features and advantages of the compressor valve are obtained from the following description of a preferred exemplary embodiment by means of the attached drawing,

There it, shows;

Fig. I a sectional view of a compressor valve according to the invention with sealing elements and collar bushes and

Fig. II a sectional part view through the valve seat and valve retainer of a compressor valve according to the invention with a sealing element and a collar bush.

Fig. I shows a sectional view of a compressor valve for a piston machine with at least one sealing element 03·, which is. embodied in the fora' of a spherical shape.

The compressor valve comprises at least one valve seat ,01 and a valve retainer 02, wherein the sealing element 03 is arranged between the valve seat &-nd the valve retainer. The sealing element 03 is mounted above a collar bush 04 or bore .06 provided in the valve seat and dips into the. collar bush dr bore by approximately a quarter of its surface.

Fig. II shows a sectional part view of a detail of a compressor valve for a piston machine, wherein the sealing element 03 in the position in which it is approximately dipped in by approximately a 'quarter of the surface rest a above the collar bush 04 on a circumferential seat strip 05, The circumferential seat strip 05 can be provided at the upper end of the collar bush 04 or the bore 06, when the collar bush 04 is ondtted. The provided collar bush 04 Is arranged in the bore 0.6. in the valve seat 01,

According to fig. II, the sealing element 03 is furthermore held in a receptacle 07, which is provided in the valve retainer 02 opposite the; valve seat 01, namely with a spacing relative to the seat strip OS in the valve seat 01» The receptacle 07 in the valve retainer 02 is provided in the immediate vicinity of the end of a bush 03, which is provided in a recess in the valve: retainer 02. In the bush 08, a spring 09 is accommodated. The spring Q9 presses onto the sealing element 0.3 with a predetermined force, so that the sealing element is subject to a predetermined tension.

The sealing element 03 is dipped into the valve retainer 02 by less than half of its surface.

Because of the spherical shape of the sealing element 03 there is the possibility that the sealing element can freely rotate in the gas floe in all directions. Through the free movabiiity of the sealing element 03 any wear of the sealing element that occurs is not only transferred to a limited circumferential point of the sealing element* but to the entire surface of the sealing element. By distributing the wear that occurs over the entire surface of the sealing element 03* a longer service life for the sealing element and thus for the compressor valve and the entire compressor plant is achieved in this manner.

By using heat-treated,, profiled collar bushes 04 with seat strip 05 the sealing elements 03 only have a line contact* which leads to a better tightness and substantially reduces also the problem of the sticking of the sealing elements,

Advantageous* furthermore* is that through the geometry of the spherical sealing elements 03 any torsion is excluded* which especially1 in connection 'with light gases* such as for example hydrogen, results in major leakages with a valve plate or valve rings.

When the valve is opened* the sealing element 03 is moved from the seat strip 05 into the receptacle 07 for the sealing element* wherein the spring 09* which is guided. In the bush 08* is tensioned and the sealing element 03 thus dampened.

During the closing operation of the valve, the preioaded spring 09 time wise acts on the sealing element 03 in a supporting manner* so that the leakages are suppressed during the closing operation.

Claims

A compressor valve for controlling a piston machine for inlet of a gas into the working chamber or an outlet of a gas from the working chamber of the piston machine, with at least one valve seat (01), a valve holder (02) and a sealing element (03), wherein the sealing element ( 03) has a spherical shape and is arranged between the valve seat (01) and the valve holder (02), characterized in that the valve seat (01) and the valve holder (02) are formed in two parts, that the sealing element (03) rests in the valve seat (01) on a seat strip (05), which is circumferentially attached to an end of a collar sleeve (04) or a bore (06) in the valve seat (01), that the sealing element (03) is held in the valve holder (02) in a receptacle (07) which is secured at one end of the valve holder (02), that the seat strip (05) is formed on the collar bushing (04) or the bore (06) in a profiled manner, that the seat strip (05) is formed at a predetermined angle as a function of the diameter of the sealing element (03) and the diameter of the collar bush (04) or bore none (06) that the sealing element (03) is arranged in the center of the seat strip (05) in a stable working position, that the sealing element (03) on the collar bushing (04) or the bore (06) has a line contact with the seat strip (05) that it line contact formed between the seat strip (05) and the sealing element (03) ensures a high tightness of the valve and reduces adhesion of the sealing element (03).

Compressor valve according to claim 1, characterized in that the uptake (07) for the sealing element (03) in the valve holder (02) is provided with a geometric shape adapted to the shape of the sealing element (03) for narrow line contact.

Compressor valve according to claim 1, characterized in that the valve holder (02) comprises a spring (09) received in a bushing (08) and the spring (09) engages the sealing element (03) with a predetermined voltage.