FR2778178A1 - Magnetic filter for water circulation systems, such as heating systems, tap hot water distribution systems etc. - Google Patents

Abstract

The construction of a magnetic filter for water circulation systems is new. Magnetic filter comprises magnetic trap placed inside container, and consisting of cylindrical magnetic bar, coaxial with container, bearing protrusions, and positioned within container with annular gap of small width allowing for flow of water. The bar is fixed at two opposite ends of container and extends approximately to its whole length, thus providing large active surface and ensuring large filtration capacity.

Description

MAGNETIC FILTER FOR WATER CIRCUITS

  The present invention relates to a magnetic filter for water circuits. The technical field of the invention is that of the manufacture of filters for water transport circuits, such as hot water heating circuits, or domestic hot water distribution. Patent application FR-A-2 704 769 (HAON) describes a filter for the sludge removal from a network of pipes in which a fluid laden with impurities circulates, such as a heating network, steam distribution system or 'hot water; the filter comprises, inside a body provided with an access opening and inlet and outlet pipes, baffles forcing the liquid to pass through it along a sinuous path to obtain the sedimentation of the impurities in suspension , and magnetic attraction means distributed on the path of the liquid inside the body to retain the metallic particles resulting from the oxidation of the pipes and devices of the water transport network. The magnetic attraction means are composed of several magnetic bars or a flexible magnetic grid; the baffles consist of truncated discs fixed perpendicularly and

  alternately on either side of a bar - coaxial to the body -

passing through the center of the baffles.

  Patent application FR-A-2 566 283 (DESPLATS) describes a water filtering device for heating circuits which comprises a magnetic sensor combined with a filter cartridge, the sensor and the cartridge being separated by a partition; the fluid flows on the internal and external surface of the magnetic sensor, then crosses the cartridge

filtering.

  An objective of the invention is to propose a magnetic filter

  for an improved water transport circuit.

  An objective of the invention is to propose a magnetic filter

  more compact and more efficient than known filters.

  An object of the invention is to provide a magnetic filter which can operate in various positions without its operation being impaired. An objective of the invention is to propose a magnetic filter

very simple and inexpensive.

  The solution to the problem posed consists in proposing a magnetic filter comprising a magnetic sensor disposed inside a container, in which the magnetic sensor consists of a cylindrical magnetic bar, preferably full, which extends substantially coaxially with the container. , which carries baffles and which delimits with the body an annular conduit (water passage) of small thickness, so as to facilitate the attraction and the retention of the metallic (or magnetizable) particles present in the water, by ensuring contact of the water with the entire external surface of the magnetic bar, and ensuring a sufficient water speed to avoid settling and to allow satisfactory operation in any mounting position, in particular in the mounting position of the filter, such that its longitudinal axis is horizontal or vertical. Thanks to the fact that the magnetic bar carries baffles, it avoids providing separate baffle supports, which simplifies the structure of the filter; it has in fact been found that, surprisingly, since magnetic materials such as ferrites in particular have very low mechanical resistance, it is possible to use the magnetic bar to support the baffles, insofar as their

  number and mass are not too high.

  The invention is particularly suitable for the manufacture of small filters, the dimensions of which generally do not exceed 100 millimeters

  in diameter and 1 meter in length.

  In addition, due to the small air gap between the magnetic bar and the internal wall of the body, it is possible to use a magnetic material of medium performance and very inexpensive, such as ferrites, while ensuring a magnetic field of attraction. throughout the water passage which is sufficient to guarantee efficient filtration by retention of magnetic particles. According to preferred embodiments of the invention - the bar is held by the two opposite ends of the container, so that 'It extends substantially over the entire length thereof, which makes it possible to obtain a large active collection surface and therefore a large filtration capacity for a reduced filter volume; - The ratio of the internal diameter of the container (or body) to the external diameter of the magnetic bar is less than 2, in particular close to 1.3 to 1.7; so that the annular air gap between the bar and the container body is reduced; the baffles are in the form of circular crown portions and serve as a positioning spacer for the bar inside the body; - the baffles are glued to the external surface of the magnetic bar; - the bar is made up of ceramic particles assembled by sintering; preferably, the bar consists of ferrite particles, of the form MFE204, in which M is a metal, in particular comprising barium particles; - The bar comprises at each longitudinal end a centering and / or positioning member, which cooperates with a complementary member provided at each end of the body of the container, which ensures good coaxiality of the bar relative to the body and allows thus ensuring an annular section of regular (or constant) water passage all along the filter; the container comprises a cylindrical body of circular section, a first end of which is closed off by a non-removable bottom and a second end of which is closed off by a removable bottom, such as a

screw cap on the body.

  According to one of the characteristics of the invention, the baffles are not used to obtain the sedimentation of the impurities but on the contrary to avoid it. The invention provides an inexpensive, efficient, compact magnetic filter, the manufacture, installation and maintenance of which are very simple.

  The advantages provided by the invention will be better understood through the following description which refers to the accompanying drawings, which

  illustrate without any limiting nature of the preferred embodiments of the invention.

  In the drawings, identical or similar elements bear the same references from one figure to another, unless otherwise indicated.

  FIG. 1 illustrates a view in longitudinal section of a filter according to the invention. Figure 2 illustrates a cross-sectional view of the filter of Figure 1;

  Figure 2 is a view along II-II of Figure 1.

  The filter 1 comprises a container or envelope 2 receiving a magnetic bar 3; the container 2 comprises a tubular metallic main body 4, of longitudinal axis 5, which is closed by a welded bottom 6 (reference 7), and comprises an inlet pipe 8 and a pipe

output 9.

  The bar 3 is of cylindrical shape of circular section, of axis

  longitudinal substantially coincident with the axis 5 of the body 4.

  The bar 3 is provided with 3 baffles 10 which are in the form of a portion of circular crown, substantially in the form of a half circular crown, and which are bonded to the external face 11 of the bar. The value of the radius of the outer edge of the baffles is close (and slightly lower) than that of the radius of the internal face 12 of the tubular body 4, so that the small clearance 13 between these parts can

  contribute or ensure the coaxiality of the bar with the body.

  However, preferably additional means for centering and holding the bar are provided inside the body in order to

  to ensure precise and reliable positioning of the bar, so that the bar delimits with the body 4 a water passage duct 14 of annular shape and of small and substantially constant thickness all along the filter.

  These means comprise a lug or projection 15 fixed to the bottom 6, of cylindrical shape which fits into a cavity 16 of corresponding cylindrical shape which is provided at one end of the bar. 10 At the second end of the bar 3 is provided a cavity 18 which receives a centering member 17 (respectively similar or identical

  to the members 16 and 15) projecting, which is provided on the internal face of a plug 19 screwed (at 21) onto the open end of the body 4. The container 4, 19 is sealed by a seal 20.

  The structure of the filter allows rapid disassembly to clean the bar after having removed it from the container; this structure is adapted

  has an inexpensive manufacture of the filter body of plastic or metal.

Claims (9)

  1. Magnetic filter (1) for water circuit which comprises a magnetic sensor (3) placed inside a container (4,19), characterized in that said magnetic sensor is constituted by a cylindrical magnetic bar, which extends substantially coaxially (5) to the container, which carries baffles (10) and which delimits with the body an annular conduit (14) of small thickness. 2. Filter according to claim 1, in which the rod is held by the two opposite ends of the container, so that it extends substantially over the entire length of the latter, which makes it possible to obtain a large active surface. of capture and therefore great   filtration capacity for reduced filter volume.   3. Filter according to any one of claims 1 or 2,   in which the ratio of the internal diameter of the container to the diameter   external of the magnetic bar is less than 2.   4. Filter according to any one of claims 1 to 3, in   which the baffles are in the form of a circular crown portion and serve as a spacer for positioning the bar inside the body.   5. Filter according to any one of claims 1 to 4, in   which the baffles are bonded to the external surface (11) of the Almante bar.   6. Filter according to any one of claims 1 to 5, in   which the bar is full and made of ceramic particles assembled by sintering.   7. Filter according to any one of claims 1 to 6, in   which the rod is made of ferrite particles, of the form MFe204, in which M is a metal, in particular comprising Barium particles.   8. Filter according to any one of claims 1 to 7, in   which the bar comprises at each longitudinal end a member (16,18) for centering and / or positioning, which cooperates with a complementary member (15,17) provided at each end of the container, which ensures good coaxiality of the bar relative to the body and thus ensures an annular section of water passage   regular or constant all along the filter.   9. Filter according to any one of claims 1 to 8, in   which the container comprises a cylindrical body of circular section whose first end is closed by a non-removable bottom (6) and   a second end of which is closed by a removable bottom (19), such as a plug screwed onto the body.