EP-4737771-A1 - CONSTANT DIFFERENTIAL PRESSURE VALVE WITH FLUID FLOW GUIDING HAT

EP4737771A1EP 4737771 A1EP4737771 A1EP 4737771A1EP-4737771-A1

Abstract

The invention relates to a shutter arrangement for a constant differential pressure valve arrangement (3) that comprises a circumferentially designed shutter member (27) that is designed and arranged to be movable in an axial direction. A centrally arranged fluid flow guiding member (38) is fixedly arranged inside of the shutter arrangement.

Inventors

Papez, Primoz
SLOKAR, Jan
BELAKAPOSKI, Jovan
OVTAR, Domen
THALER, Tilen

Assignees

Danfoss A/S

Dates

Publication Date: 20260506
Application Date: 20251007

Claims (13)

Shutter arrangement for a variable fluid flow throughput valve arrangement (3), in particular for a constant differential pressure valve arrangement (3), comprising a circumferentially designed shutter member (27) that is designed and arranged to be movable in an axial direction, characterised by a centrally arranged fluid flow guiding member (38) that is fixedly arranged inside of the shutter arrangement.
Shutter arrangement according to claim 1, characterised in that the shutter member (27) and/or the fluid flow guiding member (38) is designed and arranged to be essentially rotationally symmetric, wherein the shutter member is preferably designed and arranged as a cup-shaped member (27).
Shutter arrangement according to claim 1 or 2, characterised in that the fluid flow guiding member (38) comprises at least one protruding fluid flow guiding wall (58) that is designed and arranged to hinder a fluid flow in a circumferential direction and/or that is protruding perpendicularly from the base part (50) of the fluid flow guiding member (38).
Shutter arrangement according to any of the preceding claims, in particular according to claim 3, characterised in that the base part (50) of the fluid flow guiding member (38) is designed and arranged with a curved fluid flow guiding surface (57), preferably with an essentially rotational hyperboloidal shape (57).
Shutter arrangement according to any of the preceding claims, in particular according to claim 4, characterised in that the fluid flow guiding member (38) shows at least one, preferably a plurality of fluid throughput ports (41), that are preferably provided in the base part (50) of the fluid flow guiding member (38).
Shutter arrangement according to any of the preceding claims, in particular according to claim 5, characterised in that the at least one fluid throughput port (41) is a circular bore (41) and/or characterised in that the fluid throughput ports (41) are arranged at an essentially constant distance from the centre axis of the shutter arrangement and/or the fluid flow guiding member (38).
Shutter arrangement according to any of the preceding claims, characterised in that the shutter member (27) and/or the fluid flow guiding member (38) are connected to each other by a centrally arranged connecting shaft (55) and/or characterised in that a mechanical biasing member (56) is provided between the shutter member (27) and the fluid flow guiding member (38).
Shutter arrangement according to any of the preceding claims, characterised in that the fluid flow guiding member (38) comprises a plastics material, preferably a fibre reinforced plastics material and/or characterised in that the shutter member comprises a metal and/or a metal alloy.
Shutter arrangement according to any of the preceding claims, characterised in that the fluid flow guiding member (38) comprises a first subunit (50) and a second subunit (51) that are connected to each other by a mechanically dampening material (52) and/or by an elastically deformable material (52), in particular by a rubber material (52).
Shutter arrangement according to any of the preceding claims, characterised in that the rubber material (52) is arranged between a circumferentially inner surface of the first subunit (50) of the fluid flow guiding member (38) and a circumferentially outer surface of the second subunit (51) of the fluid flow guiding member (38).
Variable fluid flow throughput valve arrangement (3), in particular constant differential pressure valve arrangement (3), comprising a housing (4) and a shutter arrangement, characterised in that the shutter arrangement is a shutter arrangement according to any of the preceding claims.
Variable fluid flow throughput valve arrangement (3) according to claim 11, characterised in that the housing (4) comprises a pressure reference chamber (34) and a fluid throughput chamber (26, 42) that are separated by the shutter member (27) and an elastic membrane (32) that is arranged between the housing (4) and the shutter member (27).
Control valve arrangement (1) comprising at least one variable fluid flow throughput valve arrangement (3) and/or at least one additional valve arrangement (2), preferably at least one variable fluid flow throughput valve arrangement (3) and at least one poppet valve arrangement (2), characterised in that the variable fluid flow throughput valve arrangement (3) is designed and arranged as a variable fluid flow throughput valve arrangement (3) according to claim 11 or 12.

Description

The invention relates to a shutter arrangement for a variable fluid flow throughput valve arrangement, in particular for a constant differential pressure valve arrangement, that comprises a circumferentially designed shutter member that is designed and arranged to be movable in an axial direction. The invention further relates to a variable fluid flow throughput valve arrangement, in particular a constant differential pressure valve arrangement, but comprises a housing and a shutter arrangement. Further, the invention relates to a control valve arrangement, comprising at least a variable fluid flow throughput valve arrangement and at least an additional valve arrangement. Variable fluid flow throughput valves are well known and widely used in the prior art. They are used when a fluid flow has to be controlled with respect to its flux (volume per time unit). Such a variation in the fluid flux may be required for various reasons, for example to provide a certain, desired flux through the valve, to realise a certain pressure difference over the valve, or the like. Due to the widespread use of such variable fluid flow throughput valves, it is no surprise that a wide variety of different designs have been suggested that all show certain advantages and disadvantages. Depending on the situation, certain basic designs are usually preferred over the other. In particular, when it comes to constant differential pressure valve arrangements usual designs show a circumferentially arranged fluid transfer chamber, where the fluid transfer chamber provides or collects the fluid to be controlled around a usually also circumferentially designed movable shutter member. Further, a pressure reference chamber is provided that is fluidly connected to a different part of the valve by means of a fluid conduit. This way, the position of the shutter member is influenced by the pressure difference between its upper side (fluidly connected to the fluid transfer chamber, fluid inlet conduit, interconnecting fluid conduit) and its lower side. To avoid any fluid losses between the two sides of the shutter member, without introducing any unnecessary frictional forces, typically an additional flexible sealing member seals off the two sides of the shutter member. In principle, such constant differential pressure valves with cylindrical shutter members work admittedly well in practice, and are consequently widely employed. However, such constant differential pressure valves (or variable fluid flow throughput valves in general) are still deficient with respect to certain aspects, in particular when certain operational requirements have to be met. As an example, variable fluid flow throughput valves with a shutter type poppet member usually show a tendency to create a substantial amount of fluid induced noise, at least in certain ranges of fluid flux through the variable fluid flow throughput valve. It is obvious that such a behaviour is a nuisance, at least, and there is a desire to lower the amount of generated noise. Another typical problem is that the controlling behaviour of constant differential pressure valves are still somewhat inferior. In particular, forces that are created by fluid flows within the valve arrangement can have an undesirable influence on the position of the shutter valve member. It is no surprise that there is a desire in the present technical field to remove such problems, or at least to reduce such problems. It is therefore an object of the present invention to suggest a shutter arrangement for a variable fluid flow throughput valve arrangement, in particular for a constant differential pressure valve arrangement, that comprises a circumferentially designed shutter member that is designed and arranged to be movable in an axial direction, and that is improved over such shutter arrangement as they are known in the prior art. It is another object of the present invention to suggest a variable fluid flow throughput valve arrangement, in particular a constant differential pressure valve arrangement, that comprises a housing and a shutter arrangement, and that is improved over variable fluid flow throughput valve arrangements as they are known in the prior art. It is yet another object of the present invention to provide a control valve arrangement that is improved over control valve arrangements as they are known in the prior art. A shutter arrangement according to claim 1 and/or a variable fluid flow throughput valve arrangement according to claim 11 and/or a control valve arrangement according to claim 13 solve these objects, respectively. It is suggested to design and arrange a shutter arrangement for a variable fluid flow throughput valve arrangement, in particular for a constant differential pressure valve arrangement, that comprises a circumferentially designed shutter member that is designed and arranged to be movable in an axial direction, in a way that comprises a centrally arranged fluid flow guiding member that