JP2018189326A - filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a reduction of a gas passage area even when a filter having an outer peripheral wall is installed in a gas supply passage.SOLUTION: A filter 40 includes: a mesh potion 41 that prevents foreign matters having a predetermined size or larger from passing while allowing gas to pass; and an outer peripheral wall 42 holding the periphery of the mesh portion 41. A plurality of abutment portions 43 abutting on an inner peripheral surface of a gas supply passage 23 while securing gas flow passages G between the inner peripheral surface of the gas supply passage 23 and the outer peripheral wall 42 are provided on the outer peripheral wall 42 so as to protrude to the outer side in a radial direction. Compared to the case where the outer peripheral wall 42 is brought into close contact with the inner peripheral surface of the gas supply passage 23, if a radial thickness of the outer peripheral wall 42 is the same, a smaller diameter of the outer peripheral wall 42 reduces an occupied area of the outer peripheral wall 42 at the inner side of the gas supply passage 23. Therefore, this configuration can suppress a reduction of a gas passage area due to installation of the filter 40 including the outer peripheral wall 42.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filter that is installed in a gas supply passage for supplying gas and removes foreign substances contained in the gas.

  Some gas supply passages for supplying gas to a combustion apparatus or the like are provided with a filter, and foreign substances such as dust in the gas passing through the filter can be removed. In such a filter, strength is ensured so that the mesh portion is not deformed by integrally providing a mesh portion that allows gas to pass through and does not allow a foreign substance of a predetermined size or more to pass through and an outer peripheral wall that holds the periphery of the mesh portion. A structure has been proposed (for example, Patent Document 1), and the outer peripheral wall is fitted into the inner periphery of the gas supply passage.

Japanese Patent Laid-Open No. 2-102982

  However, in the configuration in which the outer peripheral wall of the filter is fitted into the inner periphery of the gas supply passage as described above, the area through which the gas can pass (gas passage area) in the cross section of the gas supply passage due to the radial thickness of the outer peripheral wall There was a problem that decreased. In particular, when there is a restriction on the diameter of the gas supply passage and it is required to make the diameter small, the gas passage area is reduced by installing a filter.

  The present invention has been made in response to the above-mentioned problems of the prior art, and even if a filter having an outer peripheral wall is installed in the gas supply passage, it is possible to suppress a decrease in the gas passage area. The purpose is to provide technology.

In order to solve the above-described problems, the filter of the present invention employs the following configuration. That is,
In a filter installed in a gas supply passage for supplying gas and removing foreign substances contained in the gas,
A mesh portion that does not pass the foreign matter of a predetermined size or more while passing the gas;
An outer peripheral wall that holds the periphery of the mesh portion,
The outer peripheral wall has a plurality of abutting portions that are in contact with the inner peripheral surface in a state where the gas flow path is secured between the inner peripheral surface of the gas supply passage and the outer peripheral wall. Protrusively provided.

  In such a filter of the present invention, a gap is secured between the outer peripheral wall and the inner peripheral surface of the gas supply passage by contacting the inner peripheral surface of the gas supply passage at a plurality of abutting portions, and this gap is formed in the gas supply passage. Compared with the case where the outer peripheral wall is in close contact with the inner peripheral surface of the gas supply passage, if the outer wall has the same radial thickness, the outer peripheral wall has a smaller diameter. However, since the occupied area of the outer peripheral wall inside the gas supply passage is reduced, it is possible to suppress a decrease in the gas passage area due to the installation of the filter having the outer peripheral wall.

  In such a filter of the present invention, the mesh portion is provided with a mesh partitioned into a lattice shape, and the interval between the outer peripheral wall and the inner peripheral surface of the gas supply passage may be equal to or smaller than the mesh opening size in the mesh portion.

  In addition to simply providing a gap between the outer peripheral wall and the inner peripheral surface of the gas supply passage in this way, the annular gap is partitioned by a plurality of contact portions, and the width (interval) of the gap is determined by the mesh size. By setting as follows, in addition to allowing the gas to pass as a flow path, the gap can be provided with a function of preventing the passage of foreign matter in the same manner as the mesh portion.

  Further, in such a filter of the present invention, in a state before being installed in the gas supply passage, the diameter of a virtual circle passing through the tip of each of the plurality of contact portions is made larger than the inner diameter of the gas supply passage. You may make it press-fit a some contact part in a gas supply path.

  In this way, it is not necessary to separately provide a support structure in either the filter or the gas supply passage, and the filter can be easily fixed.

  In the filter of the present invention described above, each of the plurality of abutting portions may be provided so as to avoid a symmetrical position with respect to the central axis of the outer peripheral wall in relation to the other abutting portions.

  In this way, the press-fitting force is not applied so as to sandwich the mesh part from both sides with respect to the central axis, and the press-fitting force applied to the mesh part from one side via the contact part is applied to the central axis. Since it can be flowed (dispersed) to the opposite side, the mesh portion can be prevented from being damaged by the press-fitting.

  Further, in the filter of the present invention described above, the direction of the straight line connecting the pair of contact portions is a pair of contact portions that are symmetrical with respect to the central axis of the outer peripheral wall among the plurality of contact portions. It is good also as providing so that it may differ from the direction of the grid | lattice-like partition material distribute | arranged to the mesh part.

  In this way, even if the press-fitting force is applied to the mesh portion through the pair of abutting portions that are symmetric with respect to the central axis of the outer peripheral wall, the partition member is directly pushed from both ends. Since the partition material is not shrunk and the shape of the partition member is slightly distorted, it is possible to absorb the press-fitting force, so that it is possible to suppress the occurrence of breakage such as a crack caused by compression in the partition member.

It is the perspective view which showed the state which decomposed | disassembled the gas supply path 1 in which the filter 40 of a present Example is installed. It is explanatory drawing which showed the state which installed the filter 40 of the present Example in the connection cylinder part 23. FIG. It is explanatory drawing which showed the state before installing the filter 40 of a present Example in the connection cylinder part 23. FIG. It is explanatory drawing which showed the state before installing the filter 40 of a 1st modification in the connection cylinder part 23. FIG. It is explanatory drawing which showed the state which installed the filter 40 of the 2nd modification in the connection cylinder part 23. FIG. It is explanatory drawing which showed the filter 40 of the 3rd deformability. It is explanatory drawing which showed the other example of the gas supply path 1 in which the filter 40 is installed.

  FIG. 1 is a perspective view showing a state in which the gas supply passage 1 in which the filter 40 of this embodiment is installed is disassembled. For example, the gas supply passage 1 is joined to a gas valve mounted on a combustion apparatus (not shown) and used to supply fuel gas. The illustrated gas supply passage 1 includes a pipe 10 that guides gas and a joint 20 that connects the pipe 10 and the gas valve. One end of the pipe 10 is closed, and an insertion hole 11 is provided through the circumferential surface of the circular tube shape. In addition, the pipe 10 of FIG. 1 is partially shown at the closed end side.

  The joint 20 has a connection port 21 connected to the gas valve, and a contact surface 22 that is curved so as to be able to contact the peripheral surface of the pipe 10. A cylindrical connecting tube portion 23 is provided so as to protrude from the contact surface 22, and the connecting tube portion 23 communicates with the connection port 21. And the pipe 10 and the joint 20 are connected in the state which penetrated the connection cylinder part 23 to the penetration hole 11 of the pipe 10, and it fixes with the fixing tool which is not shown in figure.

  Further, a recess 24 into which the O-ring 30 is fitted is provided in an annular shape on the contact surface 22 of the joint 20 so as to surround the connecting cylinder portion 23, and the O-ring 30 is interposed between the pipe 10 and the joint 20. It is sealed by letting. Such a method of connecting the pipe 10 and the joint 20 is suitable when there is no space for bending the pipe 10 and connecting it at the end. In the gas supply passage 1 in which the pipe 10 and the joint 20 are thus connected, the gas guided to the pipe 10 flows into the joint 20 through the connecting cylinder portion 23 and is supplied from the connection port 21 to the gas valve. .

  In the gas supply passage 1, a filter 40 for removing foreign matters such as dust contained in the gas passing through the pipe 10 is installed in the connecting cylinder portion 23. Although details will be described later with reference to another drawing, the filter 40 of the present embodiment includes a mesh portion 41 that does not allow a foreign substance having a predetermined size or more to pass while passing gas, and a mesh portion 41 that prevents the mesh portion 41 from being deformed. And an outer peripheral wall 42 having a cylindrical shape for holding the periphery. By removing foreign substances having a predetermined size or larger with the filter 40, it is possible to suppress the occurrence of gas valve opening / closing failure due to the foreign substances.

  In such a gas supply passage 1, it is necessary to make the diameter of the insertion hole 11 opened in the peripheral surface of the pipe 10 smaller than the inner diameter of the pipe 10, and the diameter of the connecting cylinder portion 23 inserted into the insertion hole 11 is Since the diameter is smaller than the diameter of the insertion hole 11, a cross-sectional area (hereinafter referred to as a gas passage area) through which the gas inside the connecting cylinder portion 23 can pass is also reduced. If the outer peripheral wall 42 of the filter 40 is fitted to the inner periphery of the connecting cylinder part 23, the inner diameter of the connecting cylinder part 23 is substantially reduced, and the gas passage area is further reduced. Therefore, in order to reduce the influence of the outer peripheral wall 42, a filter 40 having the following configuration is employed.

  FIG. 2 is an explanatory view showing a state in which the filter 40 of this embodiment is installed in the connecting cylinder portion 23. In the figure, a cross section of the connecting tube portion 23 and the filter 40 cut along a plane perpendicular to the central axis of the cylindrical connecting tube portion 23 is shown. As shown in the figure, the filter 40 includes a mesh part 41 having a mesh M partitioned by a grid-like partitioning member 41a. The mesh part 41 allows gas to pass through and the mesh M opening size (partitioning material). It is possible to remove foreign matters larger than the interval 41a. Further, the filter 40 of the present embodiment is made of a resin material, and a cylindrical outer peripheral wall 42 that holds the periphery of the mesh portion 41 is integrally provided. The strength of the mesh portion 41 is prevented from being deformed by gas pressure or the like. Is secured.

  Furthermore, the filter 40 of the present embodiment has a plurality of (in the illustrated example) in a state where the outer diameter of the outer peripheral wall 42 is set smaller than the inner diameter of the connecting cylinder portion 23 and protrudes radially outward from the outer peripheral wall 42. The six ridges 43 are provided so as to extend in the generatrix direction of the outer peripheral wall 42 (the front-rear direction in the figure). In the state where the filter 40 is installed inside the connecting cylinder part 23, the outer peripheral wall 42 is not in close contact with the inner peripheral surface of the connecting cylinder part 23, but a plurality of protrusions 43 are provided on the inner peripheral surface of the connecting cylinder part 23. Therefore, a gap G is secured between the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23, and gas can pass through the gap G. In addition, the protrusion 43 of a present Example is corresponded to the "contact part" of this invention.

  Thus, in the filter 40 of the present embodiment, the gap G is provided between the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23 so as to be used as a gas flow path. If the radial thickness of the outer peripheral wall 42 is the same as compared with the case where the outer peripheral wall 42 is similar to the case where the outer peripheral wall 42 is in close contact with the inner peripheral surface of the connecting cylindrical portion 23, the smaller outer peripheral wall 42 has a smaller diameter. Since the occupied area is reduced, it is possible to suppress a decrease in the gas passage area due to the installation of the filter 40 having the outer peripheral wall 42.

  Further, in the filter 40 of the present embodiment, not only the gap G is provided between the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23, but the width (radial interval) of the gap G is set to the mesh portion 41. The protrusion amount of the protrusion 43 is set so as to be equal to or smaller than the mesh size of the mesh M. In addition, since the annular gap G is partitioned into a plurality (six in the illustrated example) by a plurality of protrusions 43 provided at equal intervals in the circumferential direction of the outer peripheral wall 42, In addition to allowing gas to pass through as a path, it is possible to have a function of preventing the passage of foreign matter, similarly to the mesh portion 41.

  Further, as shown in FIG. 3, in the state before the filter 40 of the present embodiment is installed in the connecting cylinder portion 23, the diameter of the virtual circle passing through the tip of each of the plural (six) protrusions 43 is It is larger than the inner diameter of the cylindrical portion 23, and a plurality of protrusions 43 are press-fitted inside the connecting cylindrical portion 23 when the filter 40 is installed. At this time, a press-fitting force is applied to the tip of each protrusion 43 toward the central axis of the outer peripheral wall 42 as shown by a thick arrow in the drawing.

  In the filter 40 of the present embodiment, six (even number) protrusions 43 are provided at equal intervals in the circumferential direction of the outer peripheral wall 42, and each protrusion 43 is connected to one of the other protrusions 43 and the outer peripheral wall. 42 is symmetrical with respect to the central axis. The direction of the straight line connecting the pair of ridges 43 at symmetrical positions as indicated by the alternate long and short dash line in the figure is the direction of the grid-like partition material 41a in the mesh portion 41 (in the illustrated example, the up-down direction and the left-right direction). Six ridges 43 are arranged so as not to overlap with each other. Thereby, even if the press-fitting force is applied through the pair of ridges 43 at symmetrical positions so as to sandwich the mesh portion 41, the partition member 41a is not directly compressed from both ends, and the shape of the mesh M Since the press-fitting force can be absorbed by slightly distorting, the occurrence of breakage such as cracks in the partition member 41a can be suppressed.

  The filter 40 of the present embodiment described above includes the following modified examples. In the following, modifications will be described focusing on differences from the above-described embodiment. In the description of the modified example, the same components as those in the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted.

  FIG. 4 is an explanatory view showing a state before the filter 40 of the first modified example is installed in the connecting cylinder portion 23. In the figure, the filter 40 is viewed from the axial direction of the outer peripheral wall 42. Also in the filter 40 of the first modified example, the diameter of an imaginary circle passing through the tip of each of the plurality of protrusions 43 is larger than the inner diameter of the connecting cylinder portion 23, as in the above-described embodiment. When the plurality of protrusions 43 are press-fitted inside the connecting cylinder portion 23 during installation, a force of press-fitting is applied toward the center axis of the outer peripheral wall 42 at the tip of each protrusion 43.

  However, the number of the protrusions 43 of the first modification is one less than the above-described embodiment, and five (odd number) protrusions 43 are provided at equal intervals in the circumferential direction of the outer peripheral wall 42. Thus, each protrusion 43 is arranged so as to avoid a symmetrical position with respect to the central axis of the outer peripheral wall 42 in relation to the other protrusion 43. For this reason, the press-fitting force is not applied so as to sandwich the mesh part 41 from both sides with respect to the central axis, and the press-fitting force applied to the mesh part 41 from one side via the protrusion 43 is opposite to the central axis. Since it can be passed (dispersed) to the side, it is possible to suppress the occurrence of breakage such as cracks due to compression in the partition member 41a.

  Further, by reducing the number of the ridges 43, if the ridges 43 have the same size, the total area of the ridges 43 occupying the inside of the connecting tube portion 23 can be reduced. It is possible to suppress a decrease in gas passage area due to installation.

  FIG. 5 is an explanatory view showing a state in which the filter 40 of the second modified example is installed in the connecting cylinder portion 23. In the figure, a cross section of the connecting tube portion 23 and the filter 40 cut along a plane perpendicular to the central axis of the cylindrical connecting tube portion 23 is shown. In the filter 40 of the above-described embodiment and the first modification, the outer peripheral wall 42 has a circular cross-sectional shape. On the other hand, in the filter 40 of the second modified example, the cross-sectional shape of the outer peripheral wall 42 is a pentagon, and the external shape is a pentagonal column. And the protrusion 43 is not provided in the outer peripheral wall 42 of a 2nd modification, but when the filter 40 is installed in the connection cylinder part 23, the ridgeline part of a pentagonal prism will be connected to a connection cylinder part instead of the protrusion 43. 23 is in contact with the inner peripheral surface. The ridge line portion of the pentagonal prism in the outer peripheral wall 42 of the second modification corresponds to the “contact portion” of the present invention.

  In such a filter 40 of the second modified example, a gap G is secured between each side surface of the pentagonal column of the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder part 23, and the gap is the same as in the above-described embodiment. G can be used as a gas flow path, and when the outer peripheral wall 42 has the same thickness as compared with the case where the outer peripheral wall 42 is brought into close contact with the inner peripheral surface of the connecting cylinder portion 23, the outer peripheral wall 42 is The area occupied by the outer peripheral wall 42 on the inner side of the connecting cylinder part 23 becomes smaller when approaching the central axis of the connecting cylinder part 23, so that the reduction of the gas passage area due to the installation of the filter 40 having the outer peripheral wall 42 can be suppressed. it can.

  Further, in the filter 40 of the second modification, the maximum width of the gap G between each side surface of the pentagonal column of the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23 is set as the mesh size of the mesh M of the mesh portion 41. By setting as follows, the gap G can have a function of preventing the passage of foreign substances in the gas, as in the above-described embodiment.

  In the filter 40 of the second modified example, the outer peripheral wall 42 is a pentagonal column. However, if the gap G serving as a gas flow path can be secured between the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23. The outer appearance shape of the outer peripheral wall 42 may be a polygonal column such as a quadrangular column or a hexagonal column other than the pentagonal column.

  FIG. 6 is an explanatory view showing the third deformable filter 40. First, FIG. 6A shows a perspective view of the appearance of the filter 40 of the third modification. In the filter 40 according to the above-described embodiment, the protrusion 43 extends in the generatrix direction of the outer peripheral wall 42 and is continuously provided from one end to the other end of the outer peripheral wall 42 (see FIG. 1). On the other hand, in the filter 40 of the third modified example, a plurality of (six in the illustrated example) protrusions 44 are provided in a state of protruding outward from the outer peripheral wall 42 in place of the protrusions 43. Yes. The six protrusions 44 are divided into two types by changing the position of the outer peripheral wall 42 in the axial direction. The upper protrusion 44a positioned on the upper end side of the outer peripheral wall 42 in the figure and the outer peripheral wall 42 Three lower protrusions 44b located on the lower end side in the figure are provided. When the filter 40 is installed on the connecting cylinder part 23, the upper protrusion 44 a and the lower protrusion 44 b are in contact with the inner peripheral surface of the connecting cylinder part 23.

  FIG. 6B shows a state in which the filter 40 of the third modified example is installed in the connecting cylinder portion 23. In the drawing, the filter 40 is shown by a plane perpendicular to the central axis of the cylindrical connecting cylinder portion 23. The cross section which cut | disconnected the connection cylinder part 23 and the filter 40 in the position of the upper protrusion 44a is represented. As illustrated, the upper protrusions 44 a and the lower protrusions 44 b are alternately arranged in the circumferential direction of the outer peripheral wall 42 and are provided at equal intervals. The protrusion 44 on the outer peripheral wall 42 of the third modification corresponds to the “contact portion” of the present invention.

  Thus, in the filter 40 of the third modified example, the six protrusions 44 are divided into the upper protrusion 44a and the lower protrusion 44b that are different in the axial position of the outer peripheral wall 42, and three are provided, so that the upper protrusion 44a and At each position of the lower protrusion 44b, the number of protrusions 44 can be reduced (the area of the protrusion 44 occupying the inside of the connecting cylinder portion 23 can be reduced) to ensure a gas passage area. Further, while securing the gas passage area in this way, the upper protrusions 44a and the lower protrusions 44b are alternately arranged in the circumferential direction of the outer peripheral wall 42 to disperse the places in contact with the inner peripheral surface of the connecting cylinder portion 23 in the circumferential direction. Thus, the stability of the filter 40 installed in the connecting cylinder portion 23 can be enhanced.

  The number of protrusions 44 in the filter 40 of the third modification is not limited to six. For example, eight protrusions 44 may be divided into four upper protrusions 44a and four lower protrusions 44b.

  Although the filter 40 of the present embodiment and the modification has been described above, the present invention is not limited to the above-described embodiment and the modification, and can be implemented in various modes without departing from the gist thereof. is there.

  For example, in the above-described embodiment, the filter 40 is press-fitted and installed inside the connecting cylinder portion 23, but the method of installing the filter 40 is not limited to press-fitting. For example, by providing a step that protrudes radially inward from the inner peripheral surface of the connecting tube portion 23, the filter 40 is supported by one end of the ridge 43 engaging the step. Also good. However, if the filter 40 is press-fitted as in the above-described embodiment, the filter 40 can be easily fixed without newly adding a support structure such as a step. In addition, the gas passage area is not restricted by the step inside the connecting cylinder portion 23.

  In the above-described embodiment, the lattice-shaped partition member 41a is arranged on the mesh portion 41. However, the mesh portion 41 is not limited to this, for example, a plate having a large number of round holes. Also good. In this case, by setting the width of the gap G between the outer peripheral wall 42 and the inner peripheral surface of the connecting cylinder portion 23 to be equal to or smaller than the diameter of the round hole, the gap G has a function of preventing the passage of foreign substances in the gas. be able to.

  Further, in the above-described embodiment, the pipe 10 and the joint 20 are connected to the gas supply passage 1 (connecting cylinder portion 23) of the type in which the connecting cylinder portion 23 of the joint 20 is inserted into the insertion hole 11 of the pipe 10. Although the example which installs the filter 40 was shown, the gas supply path 1 in which the filter 40 is installed is not restricted to this. For example, as shown in FIG. 7, the flange 50a at one end of the upstream pipe 50 located on the upstream side of the gas flow and the flange 51a at one end of the downstream pipe 51 located on the downstream side are packed in between. The filter 40 may be installed in a gas supply passage 1 of a type that is joined with a not shown (not shown) or the like and fixed with a fixture (not shown), and the present invention can be suitably applied. The filter 40 may be installed in the upstream pipe 50 or in the downstream pipe 51.

DESCRIPTION OF SYMBOLS 1 ... Gas supply passage, 10 ... Pipe, 11 ... Insertion hole,
20 ... Joint, 21 ... Connection port, 22 ... Abutting surface,
23 ... Connecting cylinder part, 24 ... Recess, 30 ... O-ring,
40 ... filter, 41 ... mesh part, 41a ... partition material,
42 ... outer peripheral wall, 43 ... ridge, 44 ... projection,
50: Upstream pipe, 51: Downstream pipe.

Claims (5)

In a filter installed in a gas supply passage for supplying gas and removing foreign substances contained in the gas,
A mesh portion that does not pass the foreign matter of a predetermined size or more while passing the gas;
An outer peripheral wall that holds the periphery of the mesh portion,
The outer peripheral wall has a plurality of abutting portions that are in contact with the inner peripheral surface in a state where the gas flow path is secured between the inner peripheral surface of the gas supply passage and the outer peripheral wall. A filter characterized by being provided protruding. The filter according to claim 1, wherein
The mesh portion has a mesh partitioned in a lattice shape,
The filter is characterized in that a distance between the outer peripheral wall and the inner peripheral surface of the gas supply passage is equal to or smaller than the mesh opening size of the mesh portion. The filter according to claim 1 or claim 2,
In a state before being installed in the gas supply passage, the diameter of a virtual circle passing through the tip of each of the plurality of contact portions is larger than the inner diameter of the gas supply passage,
The filter, wherein the plurality of contact portions are press-fitted into the gas supply passage. The filter according to claim 3,
Each of the plurality of contact portions is provided so as to avoid a symmetric position with respect to the central axis of the outer peripheral wall in relation to other contact portions. The filter according to claim 3,
A pair of abutting portions that are symmetrical with respect to the central axis of the outer peripheral wall among the plurality of abutting portions is a lattice arranged in the mesh portion in a direction of a straight line connecting the pair of abutting portions. The filter is characterized by being provided differently from the direction of the partition material.

Images