JP2012207988A - Filter for capturing foreign substance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter for capturing a foreign substance for preventing a foreign substance captured in cooling water from falling out.SOLUTION: The filter for capturing a foreign substance has a plurality of flexed plates having the same shape and arranged in predetermined intervals, a plurality of first lattice plates fixed in a direction intersecting the arrangement direction of the flexed plates and having equal intervals A on a longitudinal edge side of the flexed plates, and a plurality of second lattice plates fixed on a longitudinal edge side opposite from the longitudinal edge side with the first lattice plates of the flexed plates connected thereto and having equal intervals B larger than the equal intervals A.

Description

  The present invention relates to a foreign matter capturing filter, and more particularly, to a foreign matter capturing filter that has a small pressure loss of circulating cooling water and can capture foreign matter present in cooling water.

  Conventionally, various foreign matter trapping filters loaded on the fuel assembly have been developed.

  In Patent Document 1, "... a debris catching device, the debris catching device includes a pair of superposed plates, each of which has substantially the same size, shape and shape. A debris catcher having a plurality of pitch holes, wherein the hole of one of the pair of plates is offset from the hole of the other plate of the pair of plates; The lower tie plate assembly for a nuclear reactor provided is described (see claim 1 of Patent Document 1 and FIGS. 10 to 14).

However, in the debris catching device described in Patent Document 1, since the two plates having holes are shifted and overlapped, the flow path of the cooling water is merely narrowed, and the flow direction is reduced. When the linear foreign matter is distributed along the line, the linear foreign matter may pass from the hole formed in the plate to the hole formed in the other plate.
In order to reduce the possibility of foreign substances passing through, improvements have been made in that the flow path of the cooling water is not made straight.

  For example, Patent Document 2 discloses that “... a fuel assembly for a nuclear reactor, and this fuel assembly includes a filter that captures solid foreign matters contained in the coolant on the inlet side of the fuel assembly. The plurality of through holes formed in the filter have a bent portion that cannot be seen straight from the inlet to the outlet, and the plurality of through holes are arranged in a staggered pattern on the flow path opening surface. "Fuel assembly" is described (refer to claim 1, Fig. 3 and 5 of Patent Document 2).

  Furthermore, Patent Document 3 discloses that “..., the foreign matter filter is a combination of a plurality of first flat plates and a plurality of second flat plates arranged in a direction orthogonal to the first flat plates. Each of the first flat plates is arranged in parallel with the axial direction of the lower tie plate, and the second flat plates are oriented in the same direction with respect to the axial direction. The first flat plate assembly, which is one of the pair of flat plate assemblies, is disposed closer to the fuel rod than the other second flat plate assembly in the axial direction. The flow path formed between the adjacent second flat plates is formed straight from the inlet to the outlet so as to be inclined with respect to the axial direction, and is formed in the second flat plate assembly. The flow path to be formed in the first flat plate assembly The lower end of the first flat plate of the first flat plate assembly is in contact with the upper end of the first flat plate of the second flat plate assembly, and the second flat plate The position of the second flat plate at the outlet of the flow path of the assembly is disposed substantially at the center of the inlet of the flow path of the first flat plate assembly, and the second flat plate at the inlet of the flow path of the first flat plate assembly. There is described "a fuel assembly in which the position of two flat plates is arranged at substantially the center at the outlet of the flow path of the second flat plate assembly" (Claims 1 and 3 of Patent Document 3). ~ 5).

  However, in the structure in which the flow path is refracted as described in Patent Documents 2 and 3, the pressure loss of the circulating cooling water increases. As a technical idea of stacking two plate bodies provided with holes as in Patent Document 1 and further deforming the flow path, for example, the invention described in Patent Document 4 can be cited.

Patent Document 4 states that “in a nuclear fuel assembly in which a support grid is brought close to the upper surface of an adapter plate of a lower nozzle having a large number of flow holes, and the outlets of the flow holes are subdivided by the grid plate of the support grid, `` Nuclear fuel assembly characterized in that the axial angle of the flow holes is inclined with respect to the flow path direction of the support grid and the inclination of the flow holes in adjacent rows is opposite to each other. '' (Refer to claim 1 and FIGS. 5 and 6 of Patent Document 4).
Further, Patent Document 5 states that “the middle part is displaced in the horizontal direction with respect to the inlet side and the outlet side so that there is no flow path that passes straight between the inlet side and the outlet side through which the coolant passes. In the fuel assembly debris filter in which the curved plates are arranged at equal intervals, a projection is locally provided on the flow surface of the curved plate so as to partition the flow path opening. "Filter" is described (Claim 1 of Patent Document 5).

However, there has been no foreign matter capturing filter capable of achieving both a sufficient reduction in pressure loss and capturing foreign matter.
Further, when the fuel assembly equipped with the conventional filter is immersed in the cooling water in the nuclear reactor, the needle-like or wire-like foreign matter conveyed with the cooling water flow passing through the filter is kept in the filter. However, when the fuel assembly is pulled up from the cooling water in the reactor or when the cooling water is discharged while the fuel assembly is inserted in the reactor, The foreign matter retained in the filter is discharged from the lower part of the filter according to gravity, and eventually the foreign matter is not removed from the reactor.

JP-A-8-240680 JP 2004-317522 A Patent No. 3977969 Japanese Patent Laid-Open No. 8-105988 Japanese Patent Laid-Open No. 2001-116872

  The problem to be solved by the present invention is a foreign matter capturing filter that has a small pressure loss of circulating cooling water, reliably captures foreign matter present in the cooling water, and prevents the captured foreign matter from falling out of the filter. Is to provide.

  Another problem to be solved by the present invention is to provide a foreign matter capturing filter capable of reducing the installation area.

  Another problem to be solved by the present invention is to provide a foreign matter trapping filter capable of reducing the manufacturing process.

Means for solving the problems are as follows:
(1) A foreign matter capturing filter comprising a plurality of bent plates having the same shape, a plurality of first lattice plates having the same shape, and a plurality of second lattice plates having the same shape,
The first lattice plate is a plate formed in a strip shape,
The second grid plate is a plate formed in a strip shape,
The bent plate has a first inclined plate formed in a strip shape and a second inclined plate formed in a strip shape sharing a longitudinal edge along the longitudinal direction of the first inclined plate,
The first length of the first slant plate in the plurality of bent plates arranged so that the first slant plates and the second slant plates are parallel to each other on the side opposite to the long side edge shared with the second slant plate. The bent plate and the first grid plate are fixed so that an edge and a longitudinal edge along the longitudinal direction of the first grid plate intersect, and the bent plate of the plurality of first grid plates The fixed interval with respect to is equal,
The second longitudinal edge of the plurality of bent plates opposite to the longitudinal edge shared with the first inclined plate and the longitudinal edge along the longitudinal direction of the second grid plate intersect with each other. Further, the bent plate and the second lattice plate are fixed, and the fixed intervals of the plurality of second lattice plates with respect to the bent plate are equal to each other, and the plurality of first lattice plates An interval larger than a fixed interval with respect to the bent plate,
A longitudinal edge of the first lattice plate fixed to the bent plate toward the second lattice plate, and a longitudinal edge of the second lattice plate fixed to the bent plate toward the first lattice plate. A filter for capturing foreign matter characterized by being in a non-contact state,
(2) The first lattice plate has a plurality of first inclined cuts formed obliquely with respect to the longitudinal direction on a longitudinal edge along the longitudinal direction of the plate,
The second grid plate has a plurality of second inclined cuts formed obliquely with respect to the longitudinal direction on the longitudinal edge along the longitudinal direction of the plate,
The first longitudinal edge of the bent plate is inserted and fixed to the first inclined cut of the first grid plate;
The foreign matter capturing filter according to (1), wherein the second longitudinal edge of the bent plate is inserted and fixed to a second inclined cut of the second lattice plate,
(3) The bent plate has a plurality of first cuts formed in a direction orthogonal to the longitudinal direction on the first longitudinal edge, and orthogonal to the longitudinal direction on the second longitudinal edge. A plurality of second cuts formed in a direction;
The first cuts in the plurality of bent plates and the first inclined cuts in the first grid plate are combined so as to mesh with each other, and the second cuts in the plurality of bent plates and the second cut in the second grid plate. The filter for capturing foreign matter according to (2), wherein the filter is combined so as to mesh with an inclined cut.
(4) The bent plate has a plurality of first cuts formed in a direction orthogonal to the longitudinal direction on the first longitudinal edge, and orthogonal to the longitudinal direction on the second longitudinal edge. A plurality of second cuts formed in a direction;
A longitudinal edge of the first lattice plate is inserted and fixed to the first inclined cut of the bent plate;
The foreign matter capturing filter according to (1), wherein a longitudinal edge of the second grid plate is inserted and fixed to the second inclined cut of the bent plate.

  According to the present invention, since the longitudinal edge of the first lattice plate and the longitudinal edge of the second lattice plate are not in contact with each other, the flow path formed only by the bent plate, in other words, the cross-sectional area is the cooling water inlet. Since the pressure loss can be reduced by the larger flow path and the cooling water can be rectified along the bent plate, a foreign matter capturing filter with a small pressure loss of the circulating cooling water can be provided. . Further, according to the present invention, the flow path of small cross-sectional area is formed by the second lattice plate and the first lattice plate and the bent plate at the portion where the cooling water flows in and the portion where the cooling water flows, so that the cooling water flows in. Since there is an opportunity to collect the foreign material twice before it flows out, the foreign material can be reliably captured, and the captured foreign material is formed by the first lattice plate and the bent plate. It stays inside the filter between the grid and the second grid formed by the second grid plate and the bent plate, so that when the cooling water flow is stopped or from the cooling water, it will not fall out of the filter. .

  Further, according to the present invention, the first grid plate and the second grid plate and / or the bent plate are provided with cuts, and the cuts and the longitudinal edges are combined or the cuts and the cuts are combined.

  As a result, the size from the part where the cooling water flows into the part where it flows out can be reduced as compared with the case where no cut is provided, and therefore a foreign matter capturing filter with a small installation area can be provided.

FIG. 1 is a plan view showing one embodiment of a foreign matter capturing filter according to the present invention. FIG. 2 is a front view of the foreign matter capturing filter shown in FIG. 3 is a partially enlarged perspective view of the foreign matter capturing filter shown in FIG. 4 is an overhead view of the foreign matter capturing filter shown in FIG. 1, (a) is an overhead view of the second lattice in the foreign matter capturing filter shown in FIG. 1, and (b) is a diagram of FIG. 2 is an overhead view of a first lattice in the foreign matter capturing filter shown in FIG. FIG. 5 is an overhead view showing another embodiment of the foreign matter capturing filter according to the present invention. FIG. 6 is a plan view showing an embodiment of the first lattice plate in the foreign matter capturing filter according to the present invention. FIG. 7 is a plan view showing one embodiment of a bent plate in the foreign matter capturing filter according to the present invention. FIG. 8 is a plan view showing another embodiment of the foreign matter capturing filter according to the present invention. FIG. 9 is a plan view showing one aspect of a foreign matter trapping state in the foreign matter trapping filter according to the present invention.

  In the following, an embodiment of the foreign matter capturing filter according to the present invention will be described with reference to the drawings. First, FIGS. 1 to 3 show the foreign matter capturing filters in different directions. FIG. 1 shows the surfaces along the longitudinal direction of a later-described first lattice plate and second lattice plate in the foreign matter capturing filter. FIG. 2 shows a surface along the longitudinal direction of a bent plate, which will be described later, in the foreign matter capturing filter. FIG. 3 is a perspective view of the foreign matter capturing filter. The foreign matter trapping filter is attached to the coolant inlet of the lower tie plate of the fuel assembly or the side of the fuel support bracket in place of the core orifice, thereby capturing foreign matter mixed in the cooling water flowing through the fuel assembly. Can be collected.

  A foreign matter capturing filter 1 shown in FIG. 1 includes a plurality of bent plates 2 having the same shape, a plurality of first lattice plates 3 having the same shape, and a plurality of second lattice plates 4 having the same shape.

  The first grid plate 3 and the second grid plate 4 are plate bodies each formed in a strip shape. The bent plate 2 includes a first inclined plate 5 formed in a strip shape and a second inclined plate 7 formed in a strip shape by sharing a longitudinal edge 6 along the longitudinal direction of the first inclined plate 5. Have.

  In addition, the dimension of each part of the 1st inclination board 5 and the 2nd inclination board 7 of the bending board 2, the angle which the 1st inclination board 5 and the 2nd inclination board 7 comprise, etc. are the collection capability of a foreign material, and cooling water. A suitable value is selected in consideration of pressure loss and the like. Further, the short side, long side and thickness dimensions of the first grid plate 3 and the short side, long side and thickness dimensions of the second grid plate 4 are formed identically. Therefore, the 1st grating | lattice plate 3 and the 2nd grating | lattice plate 4 can be obtained by manufacturing one type of strip-shaped board at the time of manufacture. However, in the foreign matter capturing filter according to the present invention, the dimensions of the respective parts of the first lattice plate and the second lattice plate need not be the same in consideration of the foreign matter collecting ability and the cooling water pressure loss. good.

  In the foreign matter capturing filter according to the present invention, the bent plate can be manufactured without any limitation to its manufacturing method as long as it is a bent plate so that the object of the present invention can be achieved. Specifically, the bending plate is a virtual longitudinal direction connecting, for example, a rectangular plate having a long edge and a short edge to a midpoint of one short edge and a midpoint of the other short edge. In this line, it is formed as a bent plate body having a first inclined plate and a second inclined plate by folding in a mountain fold or a valley fold. The first inclined plate and the second inclined plate share the bent portion of the rectangular plate as a longitudinal edge. The bent plate can be formed by bending the rectangular plate in this way, but the long edges of the two strip-shaped plates are arranged so that the two strip-shaped plates are inclined with respect to each other. It is good also as a bending board which has a 1st inclination board and a 2nd inclination board with which the longitudinal edge was shared by couple | bonding by welding. The lateral edge of the first inclined plate in the bent plate and the lateral edge of the second inclined plate may have the same dimension or different dimensions.

In the foreign matter capturing filter according to the present invention, the plurality of bent plates are arranged so that the first inclined plates and the second inclined plates are parallel to each other.
The first inclined plate and the second inclined plate in all the bent plates forming the foreign matter capturing filter have the same shape, and all the bent plates are angles formed by the first inclined plate and the second inclined plate. Are the same, it is easy to arrange all the bent plates so that the first inclined plates and the second inclined plates are parallel to each other.
The first inclined plates in all the bent plates forming the foreign matter capturing filter have the same shape, and the second inclined plates in all the bent plates have the same shape, and the first inclined plates in all the bent plates have the same shape. When the size and the size of the second inclined plate are different, the direction of the plurality of bent plates is such that the first inclined plate of the same size is arranged in parallel and the second inclined plate of the same size is arranged in parallel. It is necessary to select these and arrange them.
In any case, in the plurality of bent plates 2 arranged so that the first inclined plates 5 and the second inclined plates 7 are parallel to each other, the first longitudinal side opposite to the longitudinal edge 6 of the first inclined plate. The bent plate 2 and the first lattice plate 3 are fixed so that the edge 8 and the longitudinal edge 9 along the longitudinal direction of the first lattice plate 3 intersect each other. Further, as shown in FIGS. 1 to 3, the bent plate 2 and the first lattice plate 3 are arranged so that the first longitudinal edge 8 of the bent plate 2 and the longitudinal edge 9 of the first lattice plate 3 are orthogonal to each other. The bent plate 2 and the first lattice plate 3 are fixed.

  Further, in the plurality of bent plates 2, the bent plates are arranged such that the second long edge 10 opposite to the long edge 6 of the second inclined plate 7 and the long edge 12 of the second grid plate 4 intersect each other. 2 and the second grid plate 4 are fixed. Further, as shown in FIGS. 1 to 3, the bent plate 2 and the second grid plate 4 are bent so that the second longitudinal edge 10 of the bent plate 2 and the longitudinal edge 12 of the second grid plate 4 are orthogonal to each other. 2 and the second grid plate 4 are fixed.

  In the foreign matter capturing filter 1, as shown in FIGS. 1 to 3, the longitudinal edge 9 of the first grating plate 3 and the longitudinal edge 12 of the second grating plate 4 are arranged in a non-contact state, that is, in an isolated state. The With such an arrangement, in FIG. 1, when cooling water flows from below to above, a cooling water inflow passage formed by the bent plate 2 and the second lattice plate 4, and The flow path for cooling water flow formed by the bent plate 2 and the first lattice plate 3 is a flow path formed by the first inclined plates 5 and the second inclined plates 7 of the adjacent bent plates 2. In comparison, the cross-sectional area of the flow path is small. Therefore, the foreign matter capturing filter 1 includes a portion having a relatively small cross-sectional area of the flow path of the cooling water passing through the foreign matter capturing filter 1 and a portion having a relatively large cross section.

  In the following, the flow path has a small cross-sectional area and passes when cooling water flows into the foreign matter capturing filter 1, that is, the second grid plate 4 and the second inclined plate 7 of the bent plate 2. The flow path formed by and may be referred to as an inflow path 13. In addition, the flow path having a large cross-sectional area, that is, the flow path formed only by the bent plate 2 without the first grid plate 3 and the second grid plate 4 contributing to the formation of the flow path, is the bent flow path portion 14. May be called. Further, the flow path has a small cross-sectional area and is formed by a flow path through which cooling water flows out of the foreign matter capturing filter 1, that is, the first grid plate 3 and the first inclined plate 5 of the bent plate 2. This flow path can be referred to as the outflow path 15.

  Here, an operation when the cooling water flows through the foreign matter capturing filter 1 will be described. First, the cooling water flows through the inflow path 13, the bent flow path portion 14, and the outflow path 15 in this order. Cooling water often flows through a flow path having a larger cross-sectional area than any of the inflow path 13, the bent flow path section 14, and the outflow path 15 before passing through the foreign matter capturing filter 1. When water flows into the inflow path 13, the pressure loss increases. However, although the cooling water has a smaller cross-sectional area than the flow path outside the foreign matter capturing filter 1, the pressure loss is significantly reduced in the bent flow path portion 14 having a larger cross-sectional area than the inflow path 13. Furthermore, the flow path of the cooling water in the bent flow path portion 14 is not completely free, and a rectifying action is exerted by the bent plate 2. Inside the bent flow path portion 14, the cooling water smoothly flows from the inflow portion 13 to the outflow portion 15 by the rectifying action. Since the rectifying action is working in the bent flow passage portion 14, the pressure loss does not increase even if the cooling water flows from the bent flow passage portion 14 into the outflow portion 15. Finally, the cooling water flows out of the foreign matter capturing filter 1 through the outflow portion 15 while maintaining a small pressure loss. As a result, the foreign matter trapping filter according to the present invention is formed by a bent plate compared to the conventional foreign matter trapping filter, in which an increase in pressure loss is unavoidable due to the cooling water flowing through the channel having a small cross-sectional area. Since the bent flow path portion is provided, the pressure loss can be greatly reduced, and the cooling water can be circulated while maintaining the small pressure loss.

  Furthermore, since the foreign matter capturing filter 1 is provided with two flow paths having a small cross-sectional area, the inflow path 13 and the outflow path 15, there are two opportunities to collect the foreign substances contained in the cooling water. . Therefore, the foreign matter capturing filter 1 can collect foreign matter more reliably than a conventional foreign matter capturing filter in which one channel having a small cross-sectional area is provided.

  In the foreign matter trapping filter according to the present invention, the bent plate, the first lattice plate, and the second lattice plate are free from alteration such as being dissolved by cooling water, and are not irreversibly damaged by foreign matter. It is preferably formed of a material, and examples thereof include metals, and more specifically, stainless steel and inconel.

A view of the foreign matter capturing filter 1 as seen from the first lattice plate 3 side is shown in FIG. 4a, and a view as seen from the second lattice plate 4 side is shown in FIG. 4b. As shown in FIG. 4a, the bent portion 2 and the first lattice plate 3 are arranged so that the first longitudinal edge 8 of the bent portion 2 and the longitudinal edge of the first lattice plate 3 are orthogonal to each other, and FIG. As shown in FIG. 4, the bent portion 2 and the second lattice plate 4 are arranged so that the second longitudinal edge 10 of the bent portion 2 and the longitudinal edge of the second lattice plate 4 are orthogonal to each other.
Here, the fixed interval between the adjacent second grid plate 4 and the bent plate 2 shown in FIG. 4b is larger than the fixed interval between the adjacent first grid plate 3 and the bent plate 2 shown in FIG. 4a. Thus, the lattice density of the second lattice shown in FIG. 4b is lower than the lattice density of the first lattice shown in FIG. 4a.
As described above, in the present invention, since the lattice density of the inflow portion 13 is lower (or smaller) than the lattice density of the outflow portion 15, foreign matter having a size that can be captured by the first lattice plate 3 is Passing through the second grid plate 4 without being trapped by the two grids 4, and finally trapped in the bent flow path formed inside the foreign matter trapping filter, when the cooling water flow is stopped, Alternatively, when the fuel assembly equipped with the foreign matter capturing filter is pulled up from the cooling water, the foreign matter captured in the bent flow path portion is prevented from being discharged out of the foreign matter capturing filter.
Furthermore, in this invention, since the 1st longitudinal edge of a bending board and the longitudinal edge of a 1st grating | lattice board should just cross | intersect, for example, as shown in FIG. The bent portion 21 and the first grid plate 31 may be arranged so that the longitudinal edge of the first grid plate 31 is inclined and intersects. Whether the foreign matter trapping filter 1 or the foreign matter trapping filter 11 is used for the crossing aspect of the first longitudinal edge of the bent portion and the longitudinal edge of the first grid plate is determined by the fuel assembly in which the foreign matter catching filter is installed. What is necessary is just to determine according to the shape and magnitude | size of the foreign material contained in the cooling water which distribute | circulates a body.

  In addition, the bending plate and the first lattice plate are fixed and the bending plate and the second lattice plate are fixed by the pressure received from the cooling water flowing through the fuel assembly, the bending plate, the first lattice plate, and the second lattice plate. May be fixed to such an extent that they do not separate. For example, the contact points may be fixed by welding or the like.

  In the foreign matter capturing filter according to the present invention, as a fixing mode of the first longitudinal edge of the bent plate and the longitudinal edge of the first lattice plate or the longitudinal edge of the second lattice plate, for example, the edges are simply brought into point contact with each other and welded. However, the first grid plate and the second grid plate and / or the bent plate may be provided with a cut, and the cut and each member may be combined or the cuts may be combined and fixed. Also good. In addition, all the embodiments shown in FIGS. 1 to 5 are embodiments in which cuts are provided in all of the bent plate, the first grid plate, and the second grid plate, and are combined and fixed so that the cuts mesh with each other. The aspect which provides a cut in each member is demonstrated below.

  FIG. 6 shows the first lattice plate 3 in the foreign matter capturing filter 1 shown in FIGS.

  The first grid plate 3 has a plurality of first inclined cuts 16 formed obliquely with respect to the longitudinal direction on the longitudinal edge 9 along the longitudinal direction of the first grid plate 3. Since the first grid plate 3 and the second grid plate 4 in the foreign matter capturing filter 1 have the same dimensions, the first grid plate 3 formed as shown in FIG. Can be used. When the first grid plate and the second grid plate are made with different dimensions, they are not shown in FIG. 6, but are formed on the longitudinal edge 12 of the second grid plate 4 obliquely with respect to the longitudinal direction. A plurality of second inclined cuts may be formed.

  If a cut is provided only in the first grid plate 3 and the second grid plate 4, the first longitudinal edge 8 of the bent plate 2 is inserted into the first inclined cut 16 of the first grid plate 3, and the mutual frictional force. The outflow passage 15 is formed by being fixed at. Further, the inflow passage 13 is formed by fixing the second longitudinal edge 10 of the bent plate 2 after being inserted into the second inclined cut of the second lattice plate 4.

  By providing the first inclined cut 16 and the second inclined cut, and inserting and fixing the first long edge and the second long edge of the bent plate in the first inclined cut and the second inclined cut, respectively, without providing the cut. Compared to a mode in which the edges are simply point-contacted and fixed, the size from the inflow path to the outflow path is small, so it can be formed into a small foreign matter trapping filter, and this small foreign matter trapping can be performed in a narrow installation area. A filter can be arranged.

  FIG. 7 shows the bent plate 2 in the foreign matter capturing filter 1 shown in FIGS.

The bending plate 2 has a plurality of first cuts 17 formed in the first longitudinal edge 8 in a direction perpendicular to the longitudinal direction of the bending plate 2, and the second longitudinal edge 10 has a longitudinal length of the bending plate 2. It has a plurality of second cuts 18 formed in a direction perpendicular to the direction.
In the present invention, the number of the plurality of cuts provided at equal intervals on the first longitudinal edge of the first inclined plate in the bent plate is equal to the plurality of cuts provided at equal intervals on the second longitudinal edge of the second inclined plate. More than the number of cuts. Accordingly, the fixed intervals of the plurality of first lattice plates with respect to the bent plate are equal intervals, and the fixed intervals of the plurality of second lattice plates with respect to the bent plate are equal intervals, A fixed interval between the second grid plate and the bent plate is larger than a fixed interval between the plurality of first grid plates with respect to the bent plate.

  If a cut is provided only in the bent plate 2, the outflow path 15 is formed by fixing the longitudinal edge 9 of the first grid plate 3 after being inserted into the first cut 17 of the bent plate 2. It will be. In addition, the long edge 12 of the second lattice plate 4 is inserted into the second cut 18 of the bending plate 2 and fixed by mutual frictional force, whereby the inflow path 13 is formed.

  By providing the first cut and the second cut, and inserting and fixing the long edge of the first grid plate and the long edge of the second grid plate to the first cut and the second cut, respectively, the edge is simply not provided. Compared to the mode of fixing them by making point contact with each other, the size from the inflow path to the outflow path is small, so it can be formed into a small foreign matter capturing filter, and this small foreign matter capturing filter can be formed in a narrow installation area. Can be arranged.

  As still another aspect of providing a cut in the bent plate, the first lattice plate, and the second lattice plate, a cut is provided in any of the bent plate, the first lattice plate, and the second lattice plate, and the first in the bent plate. The cut and the first inclined cut in the first grid plate are combined and fixed so as to mesh with each other, and the second cut in the bent plate and the second inclined cut in the second grid plate are combined to engage with each other. Can be mentioned.

  Similar to the aspect in which this cut is provided, the dimensions from the inflow path to the outflow path are smaller than in the aspect in which the edges are simply point-contacted and fixed without providing the cut. It can be formed in a foreign matter capturing filter, and this small foreign matter capturing filter can be arranged in a narrow installation area.

  When each member is provided with a cut, the number of first cuts formed on the bent plate is the same as the number of the first grid plates, and the number of second cuts formed on the bent plate is the second grid plate. It is preferable that the number of bending plates is the same as the number of first inclined cuts and / or the number of second inclined cuts. According to this aspect, since it is sufficient to form grooves as many as the number of members, the first grid plate and the second grid plate can be manufactured at the same time with the same dimensions, and the manufacturing process of the foreign matter capturing filter can be simplified. Can be planned.

FIG. 8 shows another example of the foreign matter capturing filter according to the present invention. The foreign matter capturing filter 1 shown in FIG. 8 is different from the foreign matter capturing filter 1 shown in FIGS. 1 to 7 in that first, the bent plate 2 shown in FIG. In contrast to the second inclined plate 7 and the third inclined plate 19, the bent plate 2 shown in FIG. 1 includes the first inclined plate 5 and the second inclined plate 7. Further, the foreign matter shown in FIG. 8 is that the length in the short direction of the second grid plate 4 shown in FIG. 8 is longer than the length in the short direction of the second grid plate 4 shown in FIG. The trapping filter 1 is different from the foreign matter trapping filter 1 shown in FIG.
In the foreign matter capturing filter 1 shown in FIG. 1, the first grid plate 3 and the second grid plate 4 have the same shape and the same size, and are formed on the longitudinal edge 9 along the longitudinal direction of the first grid plate 3. The number and the cutting depth of the first inclined cuts 16 are the same as the number and the cutting depth of the second inclined cuts formed on the longitudinal edge 12 along the longitudinal direction of the second grid plate 4.
The second grid plate 4 in the foreign matter capturing filter 1 shown in FIG. 8 has a short edge length that is equal to a short direction length of the third inclined plate 19 and a short edge length of the second inclined plate 7. Designed to be less than the total dimensions. The second inclined cut formed in the second grid plate 4 in the foreign matter capturing filter 1 shown in FIG. 8 is the second grid plate 4 formed in the same shape as the first grid plate 3 shown in FIG. It may be the same shape as the inclined cut.
In the foreign matter capturing filter 1 shown in FIG. 8, a liquid such as cooling water is formed from the opening side of the third inclined plate 19 by the adjacent third inclined plate 19 and the adjacent second grid plate 4. The liquid introduced into the space is rectified in the space formed by the adjacent third inclined plate 19 and the adjacent second grid plate 4, and then the adjacent second inclined plate 7. A plurality of bends arranged between the plurality of first lattice plates 3 and the second lattice plates 4 introduced into the space formed by the adjacent second lattice plates 4 and further rectified. The liquid is introduced into the internal space formed by the plate 2 and then introduced into the space formed by the adjacent first inclined plate 5 and the adjacent first grid plate 3, and the introduced liquid is a foreign matter capturing filter. It flows out of 1.
This situation will be described in more detail with reference to FIG. 9. The needle-like or wire-like foreign substance 20 contained in the liquid, for example, cooling water is substantially perpendicular to the second lattice plate 4 and the bent plate 2 along with the flow of the liquid. Into the space formed by the third inclined plate 19 and the second lattice plate 4. At this time, due to the effect of the third inclined plate 19 extending in the vertical direction in FIG. Next, if the short edge of the second lattice plate 4 is sufficiently long, the first needle-like foreign material 20 enters the oblique space formed by the second inclined plate 7 and the second lattice plate 4, and then the first It reaches between the lattice plate 3 and the second lattice plate 4 and in a space formed by the bent plates 2. At this time, the needle-like foreign material 20 reaching the space formed by the bent plates 2 is inclined 21 with respect to the flow path direction due to the influence of the liquid flow disturbed by the complicated path in the filter. Furthermore, it becomes the state 22 inclined in the longitudinal direction of the bending plate 2 in the filter. In the in-filter inclined needle-like foreign matters 21 and 22, the space formed by the first lattice plate 3 and the bent plate 2 is narrower than the space formed by the second lattice plate 4 and the bent plate 2. Therefore, it cannot pass through the space formed by the first lattice plate 3 and the bent plate 2.
When the flow of the liquid passing through the foreign matter capturing filter is stopped in such a state, or when the foreign matter capturing filter is pulled up from the liquid, the gap between the first lattice plate 3 and the second lattice plate 4 If the foreign matter trapped in the space formed by the plurality of bent plates 2 and the short edge of the second lattice plate 4 are sufficiently long, the second lattice plate 4 and the bent plate 2 The foreign matter trapped in the space formed by these drops off from the foreign matter trapping filter 1 and is difficult to leave outside.

DESCRIPTION OF SYMBOLS 1,11 Filter for foreign matter capture 2,21 Bent plate 3 First lattice plate 4 Second lattice plate 5,51 First inclined plate 6, 61, 9, 12 Long edge 7 Second inclined plate 8, 81 First long edge DESCRIPTION OF SYMBOLS 10 2nd longitudinal edge 13 Inflow part 14 Bending flow path part 15 Outflow part 16 1st inclination notch 17 1st notch 18 2nd notch 19 3rd inclination board 20 Needle-like foreign material at the time of inflow 21 Flow path direction inclination needle-like foreign object 22 in the filter Bent plate in the filter longitudinally inclined needle-like foreign matter

Claims (4)

A foreign matter capturing filter comprising a plurality of bent plates having the same shape, a plurality of first lattice plates having the same shape, and a plurality of second lattice plates having the same shape,
The first lattice plate is a plate formed in a strip shape,
The second grid plate is a plate formed in a strip shape,
The bent plate has a first inclined plate formed in a strip shape and a second inclined plate formed in a strip shape sharing a longitudinal edge along the longitudinal direction of the first inclined plate,
The first length of the first slant plate in the plurality of bent plates arranged so that the first slant plates and the second slant plates are parallel to each other on the side opposite to the long side edge shared with the second slant plate. The bent plate and the first grid plate are fixed so that an edge and a longitudinal edge along the longitudinal direction of the first grid plate intersect, and the bent plate of the plurality of first grid plates The fixed interval with respect to is equal,
The second longitudinal edge of the plurality of bent plates opposite to the longitudinal edge shared with the first inclined plate and the longitudinal edge along the longitudinal direction of the second grid plate intersect with each other. Further, the bent plate and the second lattice plate are fixed, and the fixed intervals of the plurality of second lattice plates with respect to the bent plate are equal to each other, and the plurality of first lattice plates An interval larger than a fixed interval with respect to the bent plate,
A longitudinal edge of the first lattice plate fixed to the bent plate toward the second lattice plate, and a longitudinal edge of the second lattice plate fixed to the bent plate toward the first lattice plate. A filter for capturing foreign matter, characterized by being in a non-contact state. The first grid plate has a plurality of first inclined cuts formed obliquely with respect to the longitudinal direction on a longitudinal edge along the longitudinal direction of the plate,
The second grid plate has a plurality of second inclined cuts formed obliquely with respect to the longitudinal direction on the longitudinal edge along the longitudinal direction of the plate,
The first longitudinal edge of the bent plate is inserted and fixed to the first inclined cut of the first grid plate;
The foreign matter capturing filter according to claim 1, wherein the second longitudinal edge of the bent plate is inserted and fixed to a second inclined cut of the second lattice plate. The bent plate has a plurality of first cuts formed in the direction orthogonal to the longitudinal direction on the first longitudinal edge, and is formed in the direction orthogonal to the longitudinal direction on the second longitudinal edge. A plurality of second cuts made,
The first cuts in the plurality of bent plates and the first inclined cuts in the first grid plate are combined so as to mesh with each other, and the second cuts in the plurality of bent plates and the second cut in the second grid plate. The foreign matter capturing filter according to claim 2, wherein the foreign matter capturing filter is combined so as to mesh with the inclined cut. The bent plate has a plurality of first cuts formed in the direction orthogonal to the longitudinal direction on the first longitudinal edge, and is formed in the direction orthogonal to the longitudinal direction on the second longitudinal edge. A plurality of second cuts made,
A longitudinal edge of the first lattice plate is inserted and fixed to the first inclined cut of the bent plate;
2. The foreign matter capturing filter according to claim 1, wherein a longitudinal edge of the second lattice plate is inserted and fixed to the second inclined cut of the bent plate.

Images