DE1966891A1 - HIGH PRESSURE THROTTLE DEVICE - Google Patents

Description

Richard E. Self, Los Alamitos, California, V. St. A.

High pressure throttle device separation from patent application P 19 22 470.5-12

The invention relates to an effective high pressure pressure throttle device of simple construction and little space requirement and is a further development of the subject of the earlier patent

(Patent application P 16 50 196.5-12) by the same applicant.

From DT-AS 1 142 479 it is known in a throttle device For incompressible media such as water, connectable and disconnectable channels with a small cross-section to reduce pressure through friction. In the device known from this DT-AS 1 142 479, the flow channels are either radial, helical one behind the other Bores arranged in a throttle body inserted in the housing through which the medium flows from the outside of the throttle body flows inwards, provided, or the channels are through the throttle body when the flow direction is from the inside to the outside Inserted thin tubes, the outside helical around the throttle body are stored, formed, with one inside in each pail the throttle body moving piston opens or closes the individual channels.

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From US-PS 1 964 300, which is a replacement for the commonly a needle valve used to control the gas supply for an economy burner, and 2 021 300, which is a high-pressure and a throttle device to be used in a low-pressure part of a cooling device concerns, throttle devices for gases are known in which several annular plates with spiral around the common Groove-like depressions extending along the axis are provided and, if necessary, alternating with those not provided with such depressions Plates stacked one on top of the other so that the spiral indentations communicate with one another through holes in the plates Form flow channels, which together form a single continuous flow channel through the entire stack of plates, through the the total amount of gas flowing form.

A controllable injection valve is known from DT-AS 1 193 3 ^ 5, in which a cylindrical piston for controlling the rectilinearly radially extending perforated nozzles through a stationary sleeve surrounding it is formed and on the stationary sleeve a further provided with straight, radially extending hole nozzles and independent adjustable sleeve is mounted.

The object of the invention is an effective high pressure throttle device of simple construction and with the same effect, significantly less space requirement than, for example, that from the DT-AS mentioned 1 142 479 known, in which the total amount of the flowing medium divided into a large number of individual streams, which are guided through flow channels with a large ratio of length to diameter will.

According to the earlier patent (patent application

P 16 50 196.5-12) of the same applicant this task is thereby solved that in a throttling device in which a multitude of flow channels is provided and which consists of a cylinder and a piston movable in the cylinder for closing

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or open part of the flow channels or all flow channels, with the main flow direction from the space within of the cylinder runs into the space outside the cylinder or vice versa, the individual flow channels have a very high ratio from length to diameter and their length greater than the radial distance between their inlet and outlet cross-sections is, as is essentially known from the aforementioned DT-AS 1 142 479, however, the Hochdruclrdrosselvorrichtung the combination of following features on v / eist:

a) either the piston or the cylinder has the long flow channels;

b) either the piston or the cylinder has more than two joined together and parts fixed in contact with one another defining the flow channels;

c) the i? in or outlet cross-sections of the flow channels are in Groups which are provided at intervals along the stroke of movement of the piston, arranged.

According to claim 2 of the aforementioned earlier patent, the parts of the cylinder are designed as annular disks, with at least one of the surfaces of each disc has a plurality of groove-like depressions which, together with the surfaces of the adjacent ( Disc form the flow channels in such a way that the pressure-reducing effect can mainly be traced back to wall friction energy losses is.

According to the invention this object is achieved by the subject matter of Invention as defined in the claim solved.

In the draftsman; 1st:

Figure 1 is a longitudinal section through a high pressure throttle device geM: ä; .i of the invention,

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Figure 2 is a plan view of an annular disc that forms part of the cylindrical throttle body, and

Figure 3 is a plan view of another embodiment of such an annular disc.

The embodiment 10 of the throttle device according to the invention illustrated by FIG. 1 has a housing 11 of roughly in the shape of an L. The medium flows through a channel through sections 14 arranged at an angle to one another and 15 of the housing 11 is formed. Sections 14 and 15 have flanges 17 and 18 at their open ends, through which the housing is connected to pipes, tanks and the like can. A cylindrical piston 12 is fitted into the head part 21 of the housing 11 that it is in this and in the one Seat 25 arranged in the housing part 15 cylindrical throttle body 24, which has the same inside diameter as the head part 21 of the housing 11, is slidably movable.

The throttle body 24 is of a chamber that protrudes through a Part of the housing 11 is formed between its cylindrical parts 14 and 21 and in open communication with the by the housing part 15 limited part of the flow channel 13 is surrounded.

To close the flow channel 13, the piston 12 is by means of a rod 22 guided through a stuffing box 23 in the head part 21 of the housing 11 until the annular shoulder 1Q rests guided downwards at its lower end on the ring seat 20 at the upper end of the section 14 of the housing 11.

The annular discs D (Figure 2) and DD (Figure 3), which the form cylindrical throttle body 24, have like those in the he

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mentioned earlier patent (patent application

P 16 50 196.5-12) shown groove-like depressions that together limit the flow channels with the surfaces of the adjacent disks. However, while the groove-like depressions of the disks illustrated in the drawings of the earlier patent are unbranched and the same throughout their course Have cross-section, the groove-like depressions of the disks D and DD have combinations of sharp changes in direction, Repatriations, toilet and association points and expansions and constrictions.

The groove-like depressions in the disk D of FIG are arranged. Each inlet opening of a flow channel P on the inner circumference of the disk corresponds to a number of outlet openings on the outer circumference of the disk. After entering the pouring Medium in the flow channel P, the depressions initially cause eight successive, practically right-angled changes of direction, whereby four of the sections running on this part of the flow channel are concentric to the axis of the disk and four extend in the radial direction and of the radially extending one inward and three outward. After that divides the flow channel is concentric in two in opposite directions to the central axis extending arcuate parts of the part denoted by 41 and then runs through the section 42, in which in turn eight essentially right-angled changes of direction can be specified. The medium flows from section 42 into the required Section 43, which is roughly the entire, indicated by the dashed line Lines S marked circular sector spanned, from there into sections 44, each of which in turn has eight practically right-angled changes of direction, from there into an arched Ab-Sühni.tt 45, which in turn spans practically the entire sector of the circle and finally in sections 47 * the eight again Have changes of direction and of which a larger number than are provided by sections 44 and 42, respectively. From the

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cut 47 the medium emerges on the outer edge of the disk D. outside. In order to take account of an expansion of the medium when the pressure drops, not only a larger number of sections can

47 should be provided as 42, but the cross-section of the flow channels in the individual sections can be expanded progressively.

The disk DD shown in Figure 3, as indicated by the dashed line Lines S 'indicated, twelve circular sectors, and through each circular sector one runs through groove-like depressions formed flow channel PP. In this embodiment, each groove runs in a labyrinthine path through a large number generally right-angled turns, "such that the medium is continuous by sections 48 which are substantially concentric with the central axis of the disk and by sections 49 of same shape, but in the opposite direction. The sections

48 and 49 get wider from the inside out. In every section 48 and 49, the flowing medium is subject to eight changes of direction. In order to avoid an undesirably strong pressure drop at the outlet of the flow path, each outlet end can have a groove-like The recess can be provided with several openings 50. In Figure 3 three such outlet openings 50 are shown in each case.

Through a suitable choice of the number of disks as well as the choice of the number and arrangement of the groove-like depressions in the disks, in particular the number of changes in direction, the change in the number of groove-like depressions and their cross-section from the inside to the outside as well as the dividing and joining points, the throttle device according to the invention can have any desired pressure ratio be adapted, the space requirement of the entire throttle body is significantly less than that of the known Throttle devices and damage to the throttle body due to cavitation, erosion and the like. Can be largely avoided.

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By moving the piston within the throttle body in the direction of the closed position, groups of flow channels formed by the disks are switched off one after the other, as a result of which the capacity of a certain throttle body as required, i.e. according to the amount of medium that is subjected to the pressure reduction should be varied. If the amount of medium is constant, the piston can of course be omitted.

Of course, the housing 11 does not have to be formed in one piece, but can for example be assembled from several parts so that it can be taken apart in order to remove the throttle body 2h for the purpose of cleaning or to replace it with another.

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Claims (1)

Claim High pressure throttle device, which consists of an annular cylinder in which a plurality of flow channels are provided, the main flow direction being from the space within the cylinder runs in the space outside the cylinder or vice versa, the length of the flow channels is greater than the radial distance between the inlet and outlet cross-sections and the cylinder of more than two joined and fixed in contact with each other there is annular parts and wherein the annular parts are provided with groove-like depressions on at least one of their surfaces which, together with the surface of the adjacent disk, form the flow channels, marked thereby net that the groove-like depressions are combinations of sharp Changes in direction, returns, dividing and merging points, as well as extensions and constrictions. 509812/0010 Blank page