CN107303443B

CN107303443B - Back flushing filter

Info

Publication number: CN107303443B
Application number: CN201610252963.XA
Authority: CN
Inventors: W.赫金
Original assignee: Hans Sasserath GmbH and Co KG
Current assignee: Hans Sasserath GmbH and Co KG
Priority date: 2016-04-22
Filing date: 2016-04-22
Publication date: 2021-05-28
Anticipated expiration: 2036-04-22
Also published as: CN107303443A

Abstract

Filter device (10) comprising a connection (12) with an inlet (14) and an outlet (16) and a filter element (44) arranged in flow between the inlet and the outlet, configured as a back-flush filter with an outflow (126) and an outflow valve (128), wherein the device can be switched from a first state in which water flows from the inlet through the filter element (44) to the outlet (16) into a second state in which the water flows from the inlet (14) through the filter element (44) to the outflow (126) in the opposite direction when the outflow valve (128) is open.

Description

Back flushing filter

Technical Field

The invention relates to a filter device comprising a connection having an inlet and an outlet and a filter element arranged in flow between the inlet and the outlet, which filter element is designed as a back-flush filter having an outflow and an outflow valve, wherein the device can be switched from a first state, in which water flows through the filter element from the inlet to the outlet, into a second state, in which water flows through the filter element from the inlet in the opposite direction to the outflow when the outflow valve is open, wherein,

(a) the filter element is formed by a substantially cylindrical filter insert which is arranged in a filter cup such that an annular space is formed between the filter insert and the filter cup, and

(b) a substantially cylindrical channel element which is axially movable between an upper operating position and a lower backflush position and a channel which extends in the axial direction and which connects the interior of the channel element via the filter element to the annular space, which extends over the entire height of the channel element, are arranged in the filter insert, wherein the channel is provided with an opening in the direction of the filter insert and opens with its lower end into the outflow, so that in the backflush position water flows in the opposite direction through the filter insert into the channel and with the dirt particles out through the outflow.

Such a filter device is called a back flush filter. The flow flows through the filter in the operating state. In this case, the dirt particles are blocked. The filter is added over time. The flow through the filter is then reversed. The water flows in the opposite direction through the filter to the outflow and carries the dirt particles away there. In this way, the filter is cleaned by back flushing. Known back-flush filters use screens to block coarse dirt particles. When the screen is passed in the opposite direction, the dirt particles are released and carried away from the flow.

Such devices are used in domestic water appliances. The drinking water supplied to the building by the supply pipe or at the disposal of the individual tapping points is filtered.

Background

Back-flush filter devices are disclosed in a variety of ways, for example by CN 101524602A and CN 102485309 a. To maintain the filter, a barrier is provided in front of the device. For back flushing, water flow is directed in the opposite direction through the filter by appropriate valve switching. In this case, particles adhering to the filter are released and removed via the outflow. CN 102485309 a discloses a backflush filter having a rotatable channel element with a channel through which the backflush water is directed downwards.

Said documents respectively disclose filters to be arranged below the tapping point. The filter is configured as a back flush filter, wherein filter material replacement is not typically required. An outflow for the backwash water is located at an end of the lower portion of the filter bottle.

DE 102009003343 a1 and CN 102068849 disclose filter devices with a rotatable channel element and a discharge in the bottom of the filter bottle. When the outflow is opened for back flushing, back flushing can be guided through the channel element. The channel elements are arranged on the filter and in this case carry away the dirt particles in a targeted manner. The outflow is located at the bottom of the filter flask in the case of this device.

A disadvantage of the known back-flushing filter is that it is bulky. Water flows from the outside inwards through the filter insert. Dirt particles are fixed on the outer side of the filter insert and can be seen through the transparent filter cup. This is undesirable in particular in the case of use cases in which the filter is installed, for example, in a kitchen or bathroom in a visible and accessible manner.

Disclosure of Invention

The object of the invention is to provide a compact and aesthetically pleasing, aesthetic filter device which is simple to construct and has few components.

According to the invention, this object is achieved with a filter device of the type mentioned at the outset in that the filter device is provided with a filter element which is arranged in a filter housing and which is designed to be inserted into the filter housing

(c) The filter insert housing is fixedly configured and the annular space between the filter insert and the filter bowl is delimited at the lower end by a lower edge in a sealing manner and is connected at the upper end in a sealing manner to the inlet, so that water flows from the inlet into the interior space of the filter insert both in the operating position and also in the backflush position;

(d) the channel element is of substantially cylindrical design and is held in a rotationally fixed manner coaxially in the filter insert, and

(e) the channel in the channel element is closed at the upper end both in the operating position and also in the backflush position.

In the filter according to the invention, only the single movable part, i.e. the axially movable channel element, is provided in the filter itself, i.e. only. At the end of the upper part of the device, no valve function is required anymore. The flow is reversed only by an axial movement of the channel element in the inner region, which moves downward for back flushing and blocks all flow paths except the passage to the outflow. The suction generated in the channel is sufficient for sucking dirt particles away from the inner side of the filter insert through the opening in the channel. No rotation is required. In contrast to the known device, no additional filter sleeves and no rotation are required. Thereby, the device becomes more slender. Since the dirt particles are fixed to the inner side of the filter insert, they cannot be seen from the outside through the transparent filter cup.

Preferably, the filter cup has a smaller inner diameter at a level below the filter insert than at the level of the filter insert, so that a transition region tapering downward is formed and the lower edge of the filter insert rests sealingly against the transition region. In this way, the filter insert can be constructed particularly simply. Alternatively, the filter insert has an outwardly projecting edge which reaches up to the filter cup and seals against the filter cup. In a further alternative, a rim is provided on the filter cup, which projects inward. However, this alternative is more costly to manufacture.

In a further embodiment of the invention, the filter insert has an upwardly and inwardly tapering edge at the end of the upper part, which is connected in a sealing manner to the inlet or to a central channel connected thereto. With such a construction, the volume around the central channel is sufficient, through which the filtered water can flow to the outlet without major pressure losses.

Preferably, the channel element is of substantially cylindrical design and has a plurality of webs extending in the axial direction, which are distributed along the circumference and in which channels are provided. Such a channel element can be produced particularly simply and cost-effectively. However, it is also possible to provide channel elements in which the channels are arranged, for example, in a star shape and are not connected at all in the circumferential direction.

Preferably, the channel opens at the lower end into a common region connected to the outflow. This region can be formed, for example, by a double bottom.

Furthermore, it can be provided that the annular space formed between the filter insert and the filter bowl is connected to the outlet at the upper end both in the operating position and also in the backflush position. In this way, the filtered water can be released even during the back flush.

Drawings

The embodiments of the invention are the subject matter of the dependent claims. Next, the embodiments are explained in more detail with reference to the drawings.

FIG. 1 is a perspective view of a cut-away half of a back flush filter for potable water;

FIG. 2 is a longitudinal section through the backflush filter of FIG. 1 in an operating position;

FIG. 3 is a horizontal cross-section through the back flush filter of FIG. 1 along section plane B-B;

FIG. 4 is a perspective view of a channel element for use with the back flush filter of FIG. 1;

FIG. 5 is a longitudinal section through the channel element from FIG. 4;

FIG. 6 is a cross-section through the level of the channel element from FIG. 4;

FIG. 7 is detail A of FIG. 6;

FIG. 8 is an exploded view of a filter insert and channel element for the back flush filter from FIG. 1;

figure 9 shows the device of figure 1 in a back flush position along the cut plane a-a during simultaneous water discharge;

FIG. 10 is a top view of the device from FIG. 1 and depicts the location of a cut plane E-E;

FIG. 11 is a perspective view, half cut away, of a back flush filter similar to FIG. 1 in a back flush position;

fig. 12 is a longitudinal section through the device from fig. 1 in the back flushing position along a sectional plane E-E which is angularly offset with respect to the sectional plane B-B.

Detailed Description

Fig. 1 shows a backflush filter apparatus, generally illustrated at 10. The device 10 comprises a connection fitting 12 having an inlet 14 and an outlet 16 coaxial with the inlet. The arrow 18 on the connection nipple 12 shows the direction of the flow (durchflush). The connection nipple 12 can be installed into the pipe in situ before the tapping point (Zapfstelle), for example below the washing basin. In this embodiment, a two-piece connection nipple 12 is provided. The first adapter member 24 is connected to a second adapter member 28 on the side of the pipe with a nut 26. Instead of a nut, a flange can also be used. Instead of a two-part connection fitting, a one-part fitting can also be used, which is fitted directly into the pipe.

The inlet 14 is connected to a central passage 30. The outlet is connected to the annular channel 32. The annular channel 32 extends coaxially around the central channel 30. This can be seen best in figure 2.

A transparent filter cup 20 made of plastic is screwed into a sleeve 38 on the outside of the connector 12. Furthermore, a thread 22 and a seal 34 are provided. The central channel 30 turns downward at the end and opens into an inner pipe sleeve 36. A cylindrical filter insert 40 with a seal 42 is plugged onto the inner sleeve 36. Furthermore, the filter insert 40 is inclined at the upper end to the diameter of the inner jacket tube 36.

The filter bowl 20 has a slightly smaller diameter in the lower region 44. The filter insert 40 extends over the entire height of the filter bowl with a larger diameter and meets the tapering point 46 with the lower end. An annular space 48 is formed between the filter insert 40 and an upper region of the filter bowl 20. The annular space 48 is sealed downwards by a seal 50, which is located in an externally circumferential annular groove at the filter insert 40. The annular space 48 is connected to the annular channel 32 and thus also to the outlet 16.

The filter insert 40 has a plurality of ring-shaped ribs 80, which are arranged axially one above the other. This can be seen best in fig. 8. The ribs 80 form a cylindrical shape. The ribs 80 are interconnected by vertical connecting struts 52. The connecting struts 52 have a triangular cross-section and can be best seen in fig. 3.

The filter insert 40 is held in a fixed and non-rotatable manner in the filter cup 20 by means of the

seals

42 and 50 and the connecting struts 52. The position thereof is the same in the operating position shown in fig. 2 and in the back flushing position described below with reference to fig. 9 to 12.

An axially movable channel element 60 is arranged coaxially to the filter cup 20 and to the filter insert 40 in the filter cup. The channel element 60 is also shown in fig. 4 to 7, once separated. The channel element 60 has a cylindrical basic shape formed by a number of rings 72. At the upper side of the channel element 60 a ring 56 with radially extending ribs 58 is provided. The ribs 58 retain a central upwardly projecting profile peg 62. The contour pins 62 are guided in receptacles 64 which are held in the upper region of the filter insert 40 by radial ribs 66. This can be seen in fig. 1, 2 and 8. In this exemplary embodiment, the contour bolt 62 is of star-shaped design. Accordingly, the channel element 60 can also be held rotationally fixed and rotationally fixed.

The channel element 60 has a cylindrical body 70 formed by a plurality of rings 72 which are connected to one another by four axial webs 74 offset by an angle of 90 °. The tab 74 has a channel 68. This can be seen best in fig. 6. The webs 74 together with the channel 68 extend over the entire length of the channel element 60. Of course, more or fewer channels may be provided along the periphery of the channel member 60. A tab 74 having a channel 68 is molded onto the inside face of the channel member 60. An opening 76 is formed between the tab 74 and the ring 72.

An annular space 90 is formed between the channel element 60 and the filter insert 40. A projection 78 is molded externally to the channel member 60. This can be seen best in fig. 7. The annular space 90 is divided into four parts by the projections 78. The tabs 74 are located approximately midway in the angular extent between the projections 78. In the region of the web 74, the ring 72 has a slot 100. The slot 100 forms a connection between the channel 68 and an associated portion of the annular space 90. This can be seen best in fig. 7.

The passage 68 is closed at the upper end by a ring 56. The lower end of the web is connected internally to a continuous, funnel-shaped bottom 82. This can be seen best in fig. 5. In the outer end of the web 74, a funnel-shaped bottom 86 is clamped (eingeklipst) below the bottom 82. The bottom 86 is loaded by a spring 98 supported at the bottom of the filter bowl 20. A downwardly projecting lip with a circumferential groove is molded into the bottom 86 of the lower portion. A surrounding rubber lip 87 is inserted into the groove. The spring 98 is guided in the edge.

In the bottom region of the filter bowl 20, a discharge 126 is provided. The outflow 126 is closed by means of a ball valve 128. The outflow 126 and the ball valve 128 are arranged in a lower housing handle part 130 which is rotatably mounted relative to the filter bowl 20. The channel 90 extends through the bottom 124 of the lower housing handle member 130 to the outflow 126.

The ball valve 128 has a ball 129 and a valve stem 131 connected to the ball 129. The valve stem 131 is directed horizontally outwards. A handle 132 is connected to the valve stem 131. The ball 129 is rotatable via the handle 132 and the valve stem 131 about an axis of rotation lying horizontally in the plane of the drawing. By rotating the grip element 130 about a vertical axis, the grip 132 can be brought into the desired position and thereby adapted to the installation conditions. Instead of a manually operated handle 132, a back flush automatic mechanism can also be connected to the lever 131, which triggers back flushing at regular time intervals.

A hole is provided in the ball 129. The aperture is aligned with the outflow 126 in the back flush position. So that the ball valve is opened. This is shown in figures 9 to 12. Fig. 1 shows a situation in which the passage in the ball 129 is turned by 90 ° by means of the handle 132. Such that the holes extend perpendicular to the outflow portion 126. The ball valve is closed. This is the operating position.

The outer bottom 86 is connected to the outflow 126 via a channel 90, as can be seen in fig. 1. In this way, the channel 68 formed in the tab 74 is connected to the outflow 126 by the

double bottoms

82, 86. When the ball valve 128 (Kugelhahn) is opened (back flush operation), water flows down through the outflow portion 126. In this case, a suction effect is generated in the channel 68 in the web 74.

The device works as follows:

in the operating position shown in fig. 1 and 2, water flows from the inlet 14 through the central channel 30 into the interior space of the channel element 60 in the direction of the

arrows

140 and 142. The channel element 60 is located in the filter insert 40 and is closed down by the bottom 82 and the closed ball valve. Through the openings 76 in the channel element 60, the water passes through the annular space 90 and the filter insert 40 in the radial direction to the outside. In this case, dirt particles are fixed internally to the filter insert. The water flows upwardly in the annular space 48. The annular space 48 is connected to the outlet. There, filtered water is available for further use.

The ball valve 128 is opened for the back flush operation. This is shown in figures 9 to 12. From the channel 68, the water flows downwards through the intermediate space between the

bottoms

82 and 86 into the channel 90 and thus creates suction. The channel element 60 is arranged axially movably in the fixed filter insert 40 by means of a lip 87. In the operating position, the channel element 60 is pressed upwards by the spring 98. By means of the suction, the channel element 60 is moved downward in the back flushing mode against the spring bias. The lip 87 is then located at the bottom of the filter bowl 20 and closes the passage between the bottom region of the filter bowl 20 and the outflow portion 126. Accordingly, water can only flow out of the channel 68 downwards. Thereby, the suction in the channel is increased.

Arrows

102, 104 and 106 in fig. 12 depict the flow path in the back flush position. Water first flows from the inlet 14 through the central passage 30 down into the inner space of the passage element 60. It flows outwardly, as in the operating position, through the opening 76 in the channel element and the lower section of the filter insert 40 into the annular space 48.

In the channel 68, the water flows downwardly in the direction of arrow 106. The suction created thereby draws water from the narrow annular space 90 between the channel element 60 and the filter insert 40 through the slots 100. The flow is effected in the opposite direction through the filter. This is depicted by arrow 102. Dirt particles adhering to the filter insert 40 on the inside are carried away. In this way, the filter insert is rinsed and cleaned. The water flows out downwards along with the dirt particles in the direction of arrow 104.

During back flushing, the flow path to the outlet 16 is not interrupted. When water is released, fig. 9 depicts the flow path according to

arrows

110, 112 and 114. The water flows from the inlet through the filter from the inside outwards as in the operating position and further to the outlet.

In contrast to the known filter, no additional filter sleeve is required here. Accordingly, not only can additional components be dispensed with, but the device can also be embodied more slim. No rotation of the member occurs. The filter insert 40 is sealed at the lower end with respect to the filter bowl 20 and at the upper end with respect to the central channel 30.

This example is illustrated very specifically. Of course, many variants are possible. Accordingly, the scope of protection is only determined by the plain language of the claims.

Claims

1. Filter device (10) comprising a connection (12) with an inlet (14) and an outlet (16) and a filter element arranged flow-wise between the inlet and the outlet, which filter element is configured as a back-flush filter with an outflow (126) and an outflow valve, wherein the filter device can be switched from a first state in which water flows from the inlet through the filter element to the outlet (16), into a second state in which water flows from the inlet (14) through the filter element in the opposite direction to the outflow (126) when the outflow valve is open, wherein,

(a) the filter element is formed by a substantially cylindrical filter insert (40) which is arranged in a filter bowl (20) such that an annular space (48) is formed between the filter insert and the filter bowl (20), and

(b) a substantially cylindrical channel element (60) which is axially movable between an upper operating position and a lower backflush position and which is arranged in the filter insert (40) and which has an opening (76) which connects the interior of the channel element (60) via the filter element to the annular space (48) and a channel (68) which extends in the axial direction and which extends over the entire height of the channel element (60), wherein the channel (68) is provided with slots (100) in the direction of the filter insert (40) and opens into the outflow (126) at its lower end, so that water flows in the backflush position in the opposite direction through the filter insert (40) into the channel (68) and with dirt particles out through the outflow (126),

it is characterized in that the preparation method is characterized in that,

(c) the filter insert (40) housing is designed in a fixed manner and sealingly delimits an annular space (48) between the filter insert (40) and the filter cup (20) at a lower end by means of a lower edge (50) and at an upper end (64) is connected to the inlet (14) in such a way that water flows from the inlet (14) into the interior of the filter insert (40) both in the operating position and also in the backflushing position;

(d) the channel element (60) is of substantially cylindrical design and is held in a rotationally fixed manner coaxially in the filter insert (40), and

(e) the channel (68) in the channel element (60) is closed at the upper end both in the operating position and also in the backflush position.

2. The filter device (10) according to claim 1, wherein the filter bowl (20) has a smaller inner diameter at a height (44) below the filter insert (40) than at the height of the filter insert, so that a transition region (46) tapering downwards is formed and a lower edge (50) of the filter insert (40) sealingly abuts against the transition region (46).

3. A filter device (10) according to claim 1 or 2, characterised in that the filter insert (40) has an upwardly and inwardly tapering edge (64) at the end of the upper portion, which edge sealingly connects with the inlet (14) or with a central channel (30) connecting with the inlet (14).

4. A filter device (10) as claimed in claim 1 or 2, characterized in that the channel element (60) is of substantially cylindrical configuration and has a plurality of webs (74) extending in the axial direction, which are distributed along the circumference and in which the channels (68) are provided.

5. A filter device (10) as claimed in claim 1 or 2, wherein the channels (68) open at the end of the lower part into a common region which is connected to the outflow (126).

6. A filter device (10) as claimed in claim 1 or 2, characterized in that an annular space (48) formed between the filter insert (40) and the filter bowl (20) is connected to the outlet (16) at the end of the upper part not only in the operating position but also in the backflush position.