DE102006036123A1 - Drinking water filter for connection to e.g. water meter has an inlet and an outlet that are coaxial with the filter insert - Google Patents

Abstract

Claimed is a valve incorporating a filter that in the normal first operating mode allows the passage of water from an inlet to an outlet. In a second operating mode the valve allows the passage of water from the inlet through the filter to an outlet discharging in a direction opposite to the direction of flow from the inlet. In a third operating mode the valve temporarily changes from the first mode to the second mode. The filter is filter is cylindrical with an essentially radial water flow. The filter fitting has an inlet and an outlet that are coaxial with the filter insert. The filter outlet is essentially radial. In a further embodiment the fitting has a primary filter and a secondary filter that are joined by movable radial crosspieces that facilitate the change in direction of flow. The filter unit has fixed sleeves at each end.

Description

Technical area

• (a) die Ventilanordnung einen ersten, dem Normalbetrieb entsprechenden Schaltzustand aufweist, in welchem die Flüssigkeitsströmung in einer ersten Richtung von einem Einlass durch das Filter zu einem Auslass der Filterarmatur geleitet wird,
• (b) die Ventilanordnung einen zweiten Schaltzustand aufweist, in welchem eine Flüssigkeitsströmung von dem Einlass durch das Filter in einer zu der ersten Richtung entgegengesetzten Richtung zu einem Ablauf erzeugbar ist, und
• (c) die Ventilanordnung vorübergehend aus dem ersten in den zweiten Schaltzustand umschaltbar ist, wobei
• (d) der Filter zylinderförmig ausgebildet ist und die Flüssigkeitsströmung durch den Filter im wesentlichen in radialer Richtung verläuft.

The invention relates to a filter fitting with a filter and a valve arrangement, by which the flow path of a flowing through the filter fitting fluid flow can be influenced, in which

• (a) the valve arrangement has a first switching state corresponding to normal operation, in which the liquid flow is conducted in a first direction from an inlet through the filter to an outlet of the filter fitting,
• (B) the valve assembly has a second switching state in which a liquid flow from the inlet through the filter in a direction opposite to the first direction opposite to a drain is generated, and
• (c) the valve assembly is temporarily switchable from the first to the second switching state, wherein
• (D) the filter is cylindrical in shape and the liquid flow through the filter is substantially in the radial direction.

Between the drinking water supply line and a domestic water system is a filter fitting turned on. The filter fitting contains a dirt filter, which restrains dirt particles that in the water flow the supply line entrained become. Over time, such dirt filters settle. You then have to getting cleaned. For this purpose, a valve arrangement is provided, through which the water flow in the filter fitting is deflected so that they are in one of the flow direction in normal operation opposite direction through the filter and flows to a drain. This will remove the from the inlet side surface of the Filters adhering dirt particles dissolved and washed away over the drain. you refers to such a filter fitting as a "backwash".

One such backwash filters must be temporary from time to time on backwash operation be switched. This switching is usually done by visual Watch the filter through a transparent filter cup or by the increase in the pressure difference across the filter that occurs when the filter is added. The drain valve is then opened manually.

State of the art

A well-known backwash filter is in the non-prepublished DE 10 2005 00 0009.6 the applicant described. The filter is cylindrical and connected to a coaxial sleeve. The filter-sleeve arrangement is axially movable. In normal operation, the sleeve is arranged around a housing-fixed auxiliary filter and closes a valve seat. The water flows from an outer annulus through the filter and from inside to the top. When the filter is in the backwash state, the filter is moved down with a filter support. The sleeve is also moved down. Now, the water flows through the auxiliary filter into the interior of the filter, radially outward and from there through the valve formed by the filter support down.

The known backwash filter have a fixed, down-flow. The installation in a vertical pipeline is not possible or not useful, because the filter with its filter head accordingly would stand in the room. There are known filters with a rotatable flange. These can be independent of be used in the pipeline. This installation flange can be installed horizontally, horizontally, left or right. The actual filter head is then screwed on with a vertical axis.

Disclosure of the invention

It Object of the invention, a filter assembly of the aforementioned To create kind, which is compact and without effort in arbitrary Orientation can be installed in a pipeline.

• (e) die Filterarmatur einen Einlass und einen Auslass aufweist, die koaxial zu dem Filter angeordnet sind, und
• (f) der Ablauf an einem Ablaufstutzen der Filterarmatur vorgesehen ist, der im wesentlichen in radialer Richtung verläuft.

According to the invention the object is achieved in an arrangement of the type mentioned in that

• (e) the filter fitting has an inlet and an outlet disposed coaxially with the filter, and
• (F) the drain is provided at a drain port of the filter fitting, which extends substantially in the radial direction.

at This arrangement sits the filter in contrast to known arrangements coaxial with the pipeline. This allows him in any orientation be installed in the pipeline. There is no filter head, which protrudes bulky in one direction and certain installation directions excludes.

Preferably the filter comprises a coaxially arranged auxiliary filter, through the liquid flow in the second switching state is passed. This auxiliary filter avoids the accumulation of particles on the side of the outlet on the Filter. Due to the coaxial arrangement, the arrangement remains compact.

• (a) der Filter und der Hilfsfilter in einer Filteranordnung fest miteinander verbunden sind,
• (b) zwischen Filter und Hilfsfilter ein Ringvorsprung vorgesehen ist;
• (c) die Filteranordnung mit dem Ringvorsprung zwischen zwei Anschlägen in axialer Richtung beweglich geführt ist, wobei
• (d) die Anschläge von Ventilsitzen an den Enden zweier koaxialer, in axialer Richtung beabstandeter, gehäusefester Hülsen gebildet sind, durch welche jeweils ein Ringraum um den Filter bzw. Hilfsfilter herum begrenzt wird, so dass die Flüssigkeitsströmung durch den Filter geleitet wird, wenn der Ringvorsprung an dem ersten Anschlag anliegt und durch den Hilfsfilter geleitet wird, wenn der Ringvorsprung an dem anderen Anschlag anliegt.

In a particularly preferred embodiment of the invention, it is provided that

• (a) the filter and the auxiliary filter are fixedly connected together in a filter arrangement,
• (b) an annular projection is provided between the filter and the auxiliary filter;
• (C) the filter assembly is movably guided with the annular projection between two stops in the axial direction, wherein
• (D) the stops of valve seats at the ends of two coaxial, axially spaced, housing-fixed sleeves are formed, through each of which an annular space around the filter or auxiliary filter around is limited, so that the liquid flow is passed through the filter when the Ring projection abuts the first stop and is passed through the auxiliary filter when the annular projection rests against the other stop.

Of the Filter and the auxiliary filter thus form a common filter arrangement, which is mountable and interchangeable as a whole. The filter arrangement forms a movable valve disc, with two valve seats interacts. Depending on the position then the liquid flow is either through the filter or backwash through passed the auxiliary filter.

• (a) eine Feder, durch welche die Filteranordnung in dem ersten Schaltzustand gehalten wird, bei welchem der Ringvorsprung an dem Anschlag anliegt, welcher von der den Hilfsfilter umschließenden Hülse gebildet wird,
• (b) Verschlussmittel zum Verschließen des Ablaufs,
• (c) eine Membran, welche einen mit dem Ablauf in Verbindung stehenden Hohlraum, von dem Ringraum trennt, der um den Filter herum gebildet ist, und welche einerseits am Gehäuse und andererseits an der Filteranordnung befestigt ist und bei einer Druckdifferenz, die bei Öffnen der Verschlussmittel zwischen den Membranseiten auftritt, die Filteranordnung in axialer Richtung gegen die Wirkung der Federkraft in den zweiten Schaltzustand bewegt, bei welchem der Ringvorsprung an dem Anschlag anliegt, welcher von der den Filter umschließenden Hülse gebildet wird, so dass die Flüssigkeitsströmung durch den Hilfsfilter geleitet wird.

Preferably, the filter fitting has:

• (A) a spring, by which the filter assembly is held in the first switching state, in which the annular projection rests against the stop, which is formed by the auxiliary filter enclosing sleeve,
• (b) closure means for closing the drain,
• (c) a membrane separating a drain communicating cavity from the annulus formed around the filter and attached to the housing on the one hand and to the filter assembly on the other hand, and at a pressure differential when opening Closing means between the membrane sides occurs, the filter assembly moves in the axial direction against the action of the spring force in the second switching state, in which the annular projection abuts against the stop, which is formed by the sleeve enclosing the filter, so that the liquid flow is passed through the auxiliary filter ,

When opening the Drain valve falls the pressure in the cavity behind it. This forms on the membrane a pressure difference. The membrane is due to the Pressure difference pulled against a spring force in the direction of the cavity. As a result, the filter assembly is moved in the axial direction. The flow is then passed through the auxiliary filter. When the drain valve closed, presses the spring returns the filter assembly to its normal operating position.

Preferably is a housing with a first housing part provided, to which the first sleeve is formed and a with the first housing part solvable connected second housing part, on which the second sleeve is provided. The filter fitting can then be taken apart become. The filter assembly is simply inserted into the housing.

In An embodiment of the invention is in the interior of the filter assembly a pressure reducer provided. Then, in a particularly compact Arrangement controlled both the pressure, and filtered the water become.

Preferably are from the outside actuatable actuating means provided for adjusting the output pressure to the pressure reducer. The adjusting means can an actuator comprise, which arranged in a radial passage in the housing is.

In A particularly preferred embodiment of the invention is a connectable to the drain Hopper assembly with one input and two alternatively down directed, arranged at right angles to each other outputs of which is arranged coaxially with the entrance. Depending on installation direction - horizontal or vertical - can the funnel is connected to one or the other output become. Then flows the water in each case down.

refinements The invention are the subject of the dependent claims. Embodiments are below with reference to the attached Drawings closer explained.

Brief description of the drawings

1 is a cross section through a filter fitting without pressure reducer with horizontal longitudinal axis in the operating position.

2 is a perspective view of a filter assembly in detail.

3 is a perspective view of a ceramic disc assembly for closing the process.

4 is a cross section through the filter fitting off 1 at the height of the process.

5 is a cross section through the filter fitting off 1 with built-in pressure reducer in operating position.

6 is a perspective view of a pressure reducer cartridge in detail.

7 illustrates the flow of water in the assembly 5 in operating position.

8th shows the filter fitting off 5 in backwash position.

9 illustrates the flow of water in the assembly 8th in backwash position.

10 shows a membrane in detail

Description of the embodiment

In 1 is a filter fitting 10 shown for drinking water pipes. The filter fitting 10 is formed in two parts and comprises a first housing part 12 and a second housing part 14 , A connection flange 16 is in the housing part 12 screwed. A pipe connection piece 18 Made of a metal alloy is with a union nut 20 at the connection flange 16 connected. With the pipe connection piece 18 becomes the filter fitting 10 connected to a drinking water supply with water meter (not shown).

Outlet side is on the second housing part 14 also a pipe connection piece 22 made of a metal alloy with a union nut 24 intended. The water flows from a drinking water supply through the filter fitting 10 and then stands on the pipe connection piece 22 for further use, for example, in a building. The pipe fittings 18 and 22 form the inlet and outlet of the filter fitting 10 and are arranged coaxially. They define a main axis 26 , This main axis 26 coincides with the tube axis of the tube into which it is installed.

In 1 the case is shown that the main axis runs in a horizontal direction. In an analogous manner, the main axis can also be arranged vertically. In this case, the process is 28 in a manner to be described laterally offset by 90 °, so that the water can flow down.

The housing parts 12 and 14 are made of plastic. They each have a thread 30 on which they are bolted together. The housing parts 12 and 14 are formed substantially cylindrical. Inside the housing is a filter assembly 32 intended. The filter arrangement 32 is also substantially cylindrical and coaxial with the major axis 26 inserted into the housing. In 2 the filter assembly is shown separately in detail. The filter arrangement 32 has annular end pieces 34 and 36 on. Furthermore, about one third of the length is an annular projection 38 intended. The tail 36 and the ring protrusion 38 have annular grooves. In these grooves are seals 40 respectively. 42 intended ( 1 ).

In the interior 44 of the first housing part 12 is a sleeve 46 formed with a cylindrical cavity. The sleeve 46 is open on the outlet side. In the sleeve 46 is the one between the tail 36 and the ring protrusion 38 lying part of the filter assembly guided sealingly displaceable. This part forms an auxiliary filter 48 ,

The remaining part 50 the filter assembly 32 juts into the interior 52 of the second housing part 14 , In the second housing part 14 is another sleeve 54 plugged in. In this sleeve 54 protrudes the outlet side part 50 the filter assembly 32 with the tail 34 , This part forms the main filter 50 , Between the auxiliary filter 48 and the sleeve 46 is an annulus 58 educated. Between the main filter 50 and the sleeve 54 is an annulus 60 educated. The sleeve 46 and the sleeve 54 are coaxial and spaced apart in the axial direction. The annulus 58 and the annulus 60 stand over the gap 64 between the sleeves 46 and 54 with an inlet chamber 62 in the first housing part 12 in connection.

Internal to the tail 34 the filter assembly 32 is an annular membrane socket 66 intended. In the membrane mount 66 this is one end of a rolling membrane 68 attached. The other end of the membrane 68 is between the sleeve 54 and the inside of the second housing part 14 attached. The membrane is made of an elastomer and flexible. The second housing part 14 forms a collar-shaped end 70 which is in a tubular inner part 72 empties. This is in 10 shown in detail. On the tubular inner part 72 is the diaphragm socket 66 guided sealingly displaceable. Inside the collar-shaped end 70 is on the side of the membrane facing away from the filter 68 a cavity 74 educated. The cavity 74 stands with the inside of a drain neck 76 in connection. There are breakthroughs in the membrane 75 provided the annulus 60 with the cavity 74 connect. The drain neck 76 is in the radial direction down to the second housing part 14 formed. At the drain neck 76 is a funnel 78 with a mother 80 connected. In the drain neck 76 is a closure arrangement 82 intended.

In 3 is the shutter assembly 82 shown as an exploded view. Two ceramic discs 84 and 86 each have a semicircular passage 88 respectively. 90 on. The ceramic discs 84 and 86 lie on the edge of a center hole 100 a mother 92 , With this mother 92 the ceramic discs are on the drain 76 attached. The funnel 78 is with the mother 80 around the mother 92 attached to the drain neck.

The upper ceramic disc 88 has laterally two opposite projections 96 on. These projections 96 engage in corresponding recesses in the outlet pipe 76 , The ceramic disc 88 stays in their position accordingly. If the mother 92 is rotated, so the angular position of the ceramic disc changes 88 and thus also the position of the passage opening 88 Not. The lower ceramic disc 86 has two crossed, slot-shaped grooves on the underside 98 on. In these grooves 98 protrudes a cross-shaped projection 102 standing on the inside of the mother 80 is formed. If the mother 80 is rotated, also turns the ceramic disc 86 , Accordingly, the angular position of the passage opening changes 90 , The passage openings 88 and 90 are designed so that they lie one above the other at corresponding angular positions. Then the passage for the flow is released. In another angular position, the passage openings are just offset by 180 °. Then the flow is blocked. By simply turning the nut 80 can in this way the expiration 28 opened and closed.

A cross section through the drain neck is in 4 shown. The drain funnel arrangement 78 has a first exit 104 on. The output should always be directed downwards. With horizontal main axis 26 ( 1 ) becomes the filter assembly 10 arranged so that the drain neck 76 pointing down. Then one becomes coaxial with the output 104 running entrance 106 attached to the drain neck. The funnel 78 has another, perpendicular to the entrance 106 running exit 108 on. If the main axis 26 runs vertically, the water can through the exit 108 flow away. Then the funnel will be at this exit 108 appropriate.

The described filter arrangement works as follows:
The water flows from the pipe connection piece 18 in the inlet chamber 62 , From there outside along the sleeve 46 up to the space between the sleeve 46 and the sleeve 54 , There it flows radially inwards. It happens the filter arrangement 32 at the main filter part 50 , The ring protrusion 38 lies at the sleeve end of the sleeve 46 at. From the interior of the filter, it flows through the tubular inner part 72 of the second housing part 14 into the pipe connection piece 22 , When passing the filter particles are hanging. Over time, the filter sets. Then is switched from the normal operation described in a backwash.

For backwashing the filter assembly is the mother 80 rotated by 180 °. Then the openings of the ceramic discs are superimposed and the cavity 74 is connected to the atmosphere. On the other side of the membrane 60 the inlet pressure of the drinking water supply prevails. Accordingly, a pressure difference forms with the opening of the drain. The water flows through the breakthroughs 75 in the membrane in the cavity 74 and from there into the process. The breakthroughs are small compared to the cross section of the process. Accordingly, a force is applied to the membrane 68 exercised. The in the membrane socket 66 held end of the diaphragm moves with the diaphragm socket to the right in 1 and 10 , The membrane mount 66 is with the filter assembly 32 connected. Accordingly, the pressure difference also moves the filter assembly to the right until the annular projection 38 at the end of the sleeve 54 strikes. The ring protrusion 38 and the sleeve 54 form a valve in which the sleeve end is the valve seat. The path through the filter is blocked at this position of the filter assembly. Now the auxiliary filter 48 at the height of the space between the sleeves 46 and 54 , The water flows through the auxiliary filter 48 radially inward into the interior of the filter. From there it flows in the opposite direction through the main filter. The accumulated particles are rinsed off. The water flows through the membrane in the manner described 68 the end. When the filter is free again, the process is closed. A feather 110 pushes the filter assembly back to its original position.

In 5 is the same arrangement as in the 1 to 4 shown. Here, however, is a pressure reducer 112 used in the interior of the filter assembly. The pressure reducer 112 is of conventional construction and therefore does not need to be described in detail. The pressure reducer achieves a uniform outlet pressure. To set the desired output pressure is an adjusting spindle 114 intended. The adjusting spindle 114 is with a bevel gear 116 connected. The bevel gear 116 is by means of a bevel gear arranged perpendicular thereto 118 emotional. The bevel gear 118 sits in a lateral opening in the first housing part 12 , At its outer end a recess is provided, so that the operation can be done with a screwdriver, Allen key or the like. In 6 is the pressure reducer cartridge 112 shown in perspective. At the outlet end of the pressure reducer cartridge are sound insulation pins 120 intended. The cartridge-like design of the pressure reducer allows easy insertion when the housing parts 12 and 14 be taken apart.

To avoid a pressure increase when heated on the non-wetted side of the pressure reducer 112 ie in the interior 126 the screw cap 124 an outward connection via the screw cap to the atmosphere is provided. To the water space is by sealant 128 and 130 sealed.

If, as in the 1 to 4 , no pressure reducer is used, can still the same housing part 12 be used. Then the breakthrough is with a stopper 122 locked.

In 5 the filter arrangement is shown in normal operation. The course of the water flow in this mode of operation is in 7 through arrows 132 illustrated. In 8th the backwash position is shown. At this position is the valve 134 closed. The course of the water flow is in 9 by arrows 136 illustrated.

Of the Advantage of the arrangement described is that these independent of Course of the pipe can be installed. She does not stick out of the Installation level and can be installed like a piece of pipe become.

Claims (9)

Filter fitting ( 10 ) with a filter ( 32 ) and a valve assembly ( 38 . 134 ) by which the flow path of a fluid flow flowing through the filter fitting can be influenced, in which (a) the valve arrangement has a first switching state corresponding to the normal operation ( 1 ; 5 ; 7 ), in which the liquid flow is directed in a first direction from an inlet through the filter to an outlet of the filter fitting, (b) the valve arrangement has a second switching state (FIG. 8th ; 9 ), in which a liquid flow from the inlet through the filter in a direction opposite to the first direction to a drain ( 28 ), and (c) the valve arrangement is temporarily switchable from the first to the second switching state, wherein (d) the filter is cylindrically shaped and the liquid flow through the filter is substantially in the radial direction, characterized in that (e) the filter fitting has an inlet and an outlet, which are arranged coaxially with the filter, and (f) the outlet at a discharge nozzle ( 76 ) of the filter fitting is provided which extends substantially in the radial direction. Filter fitting according to claim 1, characterized in that the filter has a coaxially arranged auxiliary filter ( 48 ), through which the liquid flow is conducted in the second switching state. Filter fitting according to claim 2, characterized in that (a) the filter ( 50 ) and the auxiliary filter ( 48 ) in a filter arrangement ( 32 ) are firmly connected to each other, (b) between the filter and the auxiliary filter an annular projection ( 38 ) is provided; (c) the filter arrangement with the annular projection between two stops ( 46 ; 54 ) is movably guided in the axial direction, wherein (d) the stops of valve seats at the ends of two coaxial, axially spaced, housing-fixed sleeves ( 46 ; 54 ) are formed, through which in each case an annular space ( 58 . 60 ) around the filter ( 50 ) or auxiliary filter ( 48 ) is limited so that the liquid flow is passed through the filter when the annular projection on the first stop ( 46 ) and is passed through the auxiliary filter when the annular projection on the other stop ( 54 ) is present. Filter arrangement according to claim 3, characterized by (a) a spring by which the filter arrangement is held in the first switching state, in which the annular projection bears against the stop which is formed by the sleeve enclosing the auxiliary filter, (b) closure means ( 82 ) for closing the process, (c) a membrane ( 68 ) having a cavity ( 74 ), from the annulus ( 60 ) separating the filter ( 50 ) is formed around, and which on the one hand on the housing ( 14 ) and on the other hand on the filter arrangement ( 66 ) is attached and at a pressure difference, which occurs upon opening of the closure means between the membrane sides, the filter assembly moves in the axial direction against the action of the spring force in the second switching state in which the annular projection bears against the stop, which of the sleeve enclosing the filter is formed, so that the liquid flow is passed through the auxiliary filter. Filter arrangement according to one of the preceding claims, characterized in that a housing with a first housing part ( 12 ) is provided, to which the first sleeve ( 46 ) is integrally formed and releasably connected to the first housing part second housing part ( 14 ), on which the second sleeve ( 54 ) is provided. Filter arrangement according to one of the preceding claims, characterized in that in the interior of the filter assembly, a pressure reducer ( 112 ) is provided. Filter arrangement according to claim 6, characterized by externally operable actuating means ( 116 . 118 ) for adjusting the outlet pressure at the pressure reducer. Filter arrangement according to claim 7, characterized ge indicates that the actuating means comprise an actuating element ( 118 ), which is arranged in a radial passage in the housing. Filter arrangement according to one of the preceding claims, characterized by a funnel arrangement which can be connected to the outlet ( 78 ) having one input and two alternatively downwardly directed, mutually perpendicular outputs, one of which is coaxial with the input.