JP5270723B2 - Filter device - Google Patents

Description

  The present invention relates to a filter device that is provided in a water channel that is forced to flow in one direction and removes foreign substances in water that flows through the water channel.

  A water pipe provided in a water heater or a dishwasher is provided with a valve device such as an electromagnetic valve, and a filter is provided upstream of the valve device. The filter removes foreign matters such as solid particles from the passing water, and prevents the foreign matter from entering the valve device and causing the valve device to malfunction.

  The filter has a fine pore shape or a net shape, and water hardly passes against the foreign matter capturing performance. That is, when the valve device is opened and forced to flow with flowing water pressure, the water easily passes through the filter. However, when the valve device closes and the water flow stops, water may be sealed in the pipe on the downstream side in the water flow direction of the filter due to the surface tension of the water formed on the surface of the filter. At this time, even if the water in the pipe on the upstream side in the water flow direction of the filter is discharged, water does not escape from the pipe on the downstream side in the water flow direction of the filter, and there is a possibility that inconveniences such as freezing and decay of the water remaining in the pipe may occur There is.

  Therefore, conventionally, a drainage channel formed in a groove shape or a hole shape so as to cause capillary action is connected to a part of the filter, and water remaining in the pipe on the downstream side in the water flow direction of the filter is supplied to the capillary tube of the drainage channel. There is known one that guides toward the upstream side (water draining direction) of the filter in the water flow direction using the phenomenon (see Patent Document 1 below).

JP 2006-336914 A

  However, the drainage channel employed in the conventional filter needs to be relatively narrow in the groove shape or the hole shape that constitutes the drainage channel in order to guide water using the capillary phenomenon. For this reason, since the flow rate of the water drained by the drainage channel is small and it takes a long time to drain the water, the drainage efficiency is poor. In addition, when foreign matter enters the drainage channel, clogging may occur. In order to prevent this, if the groove shape or the hole shape constituting the drainage channel is widened, the function of capturing foreign matter as a filter is lowered.

  In view of the above points, an object of the present invention is to provide a filter device that can smoothly and reliably drain water without reducing the function of removing foreign matter.

  In order to achieve such an object, the present invention provides a filter device provided in a water channel that is forced to flow in one direction, and has a filter function part that removes foreign substances from the passing water and is fixed to the water channel. The filter member is provided upstream of the filter member in the water flow direction, moves downstream in the water flow direction due to flowing water pressure during water flow, and flows upstream in the water flow direction when draining in the direction opposite to the water flow. A moving member that moves to the side, and a drainage passage that allows residual water remaining on the downstream side in the water passage direction of the filter member without passing through the filter function portion, the moving member to the downstream side in the water passage direction. It is characterized by comprising a closing part that closes the drainage passage without closing the filter function part when moved.

  In the filter device of the present invention, the moving member moves downstream in the water passage direction when the water flows, and the blocking portion of the moving member closes the drain passage, and the water member moves upstream in the water passage direction when draining water. Open the drainage passage. As a result, foreign matter can be reliably removed from the water passing through the filter function part of the filter member when water is passed, and water can be smoothly drained from the drain passage of the filter member when draining.

  Therefore, according to the filter device of the present invention, water can be drained smoothly and reliably without deteriorating the function of removing foreign matter.

  In order to move the moving member to the downstream side in the water flow direction by the flowing water pressure at the time of water flow and to move the upstream side in the water flow direction at the time of draining, for example, the moving member is directed to the upstream side in the water flow direction. For example, an urging means such as a spring for urging may be provided. In this case, it is necessary to set the urging force of the urging means so as not to hinder the movement of the moving member due to the flowing water pressure during water flow. In addition, the number of parts increases due to the provision of biasing means such as a spring.

  Therefore, in the present invention, the water flow path in the region where the filter member and the moving range of the moving member are provided is provided in such a posture that the upstream side in the water passage direction faces downward and the downstream side in the water passage direction faces upward. The moving member is movable in the vertical direction in the water flow path, and is lifted by the flowing water pressure when water flows and comes into contact with the filter member. When the water is drained, the moving member is lowered by its own weight and separated from the filter member. It is preferable to do.

  As a result, the moving member can be moved upstream in the water direction when draining water, simply by providing the water channel in the region in the vertical orientation. Accordingly, the biasing means such as a spring for moving the moving member to the upstream side in the water direction is not necessary, and the number of parts can be reduced, so that a filter device with high manufacturing efficiency and a reduced cost can be obtained. Can do.

  Further, the drainage passage of the present invention may be formed in a part of the filter member, or may be formed in a part of the inner wall of the water flow path.

  Furthermore, the drainage passage may be provided in both part of the filter member and part of the water flow path. According to this, since the flow rate of water in the drainage passage can be increased, drainage can be performed more quickly and reliably.

Explanatory drawing which looked at the filter apparatus of embodiment of this invention in cross section. The top view of the filter member in this embodiment. Explanatory drawing which looked at the moving member in this embodiment from the bottom face. Explanatory drawing which shows typically a part of water circuit in which a filter apparatus is provided. Operation | movement explanatory drawing of the filter apparatus of this embodiment. Explanatory drawing which shows the modification in the filter apparatus of this embodiment. Explanatory drawing which looked at the filter apparatus of other embodiment.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the filter device 1 according to the present embodiment includes a cylindrical body 3 having a water flow path therein and both ends connected in the middle of the water conduit 2, and a filter fixed inside the cylindrical body 3. A member 4 and a moving member 5 movably accommodated inside the cylinder 3 are provided.

  As shown in FIG. 2, the filter member 4 includes a filter function part 6 formed in a disk shape and a frame part 7 surrounding the periphery thereof, and covers the upper end (downstream end in the water passage direction) inside the cylindrical body 3. Is provided. The filter function unit 6 is formed in a mesh shape or a porous shape, and has a function of removing foreign substances from the passing water. The filter function unit 6 is formed of a synthetic resin together with the frame portion 7. The frame portion 7 is formed in an annular shape and includes a plurality of through holes 8. The through hole 8 of the frame portion 7 does not have a function of removing foreign substances from the passing water, and is formed in a size that allows water to easily flow. Therefore, the water passing through the through hole 8 does not remain in the through hole 8 due to the surface tension. The frame portion 7 is fitted to the inner wall surface of the cylinder 3 so that the through hole 8 is exposed. In addition, the through-hole 8 of the frame part 7 functions as a drainage passage of the present invention.

  In the filter member 4, the filter function part 6 and the frame part 7 may be integrally formed. The filter function part 6 and the frame part 7 are separated and the filter function part 6 is assembled inside the frame part 7. It may be formed by.

  As shown in FIG. 1, the tubular body 3 is provided at a position where water is forcedly passed from below to above in the water pipe 2. Thereby, the cylinder 3 is set to a posture in which the downstream side in the water passage direction is upward and the upstream side in the water passage direction is downward. In addition, in FIG. 1, the direction of the water flow at the time of water flow is shown by the arrow.

  The moving member 5 has an annular shape that is slightly smaller than the inner diameter of the cylindrical body 3 and is made of synthetic resin. The moving member 5 is located below the filter member 4 (upstream side in the water passage direction) and is movable in the vertical direction inside the cylindrical body 3. Then, the moving member 5 rises toward the downstream side in the water flow direction due to the flowing water pressure when water flows into the water pipe 2, and when the water flow to the water pipe 2 is stopped and the water flow is stopped, The inside of the cylinder 3 descends toward the upstream side in the water direction due to its own weight.

  The synthetic resin material that forms the moving member 5 is preferably a material that is not easily affected by temperature changes and has high impact resistance, and examples thereof include thermoplastic resins mainly composed of polyphenylene ether. Further, it is preferable to form the moving member 5 so that the specific gravity is slightly larger than 1 (for example, about 1.05 to 1.1) by selecting the material. According to this, when the water flow is stopped, the moving member 5 in water can be immediately lowered by its own weight, and the increase of the moving member 5 due to the flowing water pressure at the time of water flow is not hindered. In addition, when improving the rising speed at the time of the raise by flowing water pressure, you may form the moving member 5 so that specific gravity may be 1 or less.

  As shown in FIG. 1, the moving member 5 that has moved up inside the cylindrical body 3 comes into contact with the filter member 4 located above from the lower side and is stopped. At this time, the moving member 5 closes the through hole 8 of the filter member 4 on its upper surface, as shown in FIGS. Therefore, in the present embodiment, the upper surface of the moving member 5 at a position corresponding to the through hole 8 corresponds to the blocking portion in the present invention.

  A stopper 9 is provided inside the cylinder 3 to stop the moving member 5 that has been lowered. The stopper 9 is an annular member fitted to the inner wall surface of the cylindrical body 3 on the downstream side in the water flow direction, and the moving member 5 is seated on a portion protruding inward of the cylindrical body 3, thereby The moving member 5 is stopped by restricting the above-described lowering. Therefore, the area between the filter member 4 and the stopper 9 inside the cylinder 3 is the moving range of the moving member 5. The stopper 9 only needs to make it impossible for the moving member 5 to pass downward, and need not be an annular member. For example, the stopper 9 may be a protrusion that protrudes from the inner wall surface of the cylindrical body 3.

  The filter device 1 having the above configuration can be suitably provided in a water circuit such as a water heater as schematically shown in part in FIG. The starting end of the water pipe 2 is connected to a water supply, and a valve device such as a water amount sensor 10, a solenoid valve 11, and a check valve 12 is provided in the middle of the water pipe 2. The filter device 1 is provided on the upstream side of these valve devices. As a result, foreign matter such as solid particles mixed with tap water and entering the water pipe 2 is prevented from entering the valve devices.

  That is, when tap water is supplied to the water flow pipe 2, in the filter device 1, first, the moving member 5 is pushed up and moved by the flowing water pressure from the lower side (upstream side in the water flow direction) of the cylindrical body 3. Then, as shown in FIG. 5A, the moving member 5 rising to the upper end (downstream end in the water passage direction) of the cylindrical body 3 is brought into contact with the filter member 4 and stopped, and at the same time, the frame portion of the filter member 4 The through-hole 8 formed in 7 is closed. At this time, since the moving member 5 is formed in an annular shape, it does not block the filter function unit 6 even if it contacts the filter member 4.

  Thereby, in the filter member 4 in which the through-hole 8 is closed, the entire water flow toward the downstream side of the filter device 1 passes through the filter function part 6 of the filter member 4, and foreign matters are removed by the filter function part 6.

  Further, when the outside air becomes cold as in winter, the drain plug 13 (see FIG. 4) provided on the upstream side of the filter device 1 is opened to prevent the water pipe 2 from freezing. Water is drained.

  When the specific gravity is slightly larger than 1 as described above, the moving member 5 in the present embodiment is immediately lowered by its own weight when the water flow to the water pipe 2 is stopped. The lowered moving member 5 comes into contact with the stopper 9 at the lower end (upstream end in the water passage direction) of the cylindrical body 3 and stops. In this state, when the drain plug 13 is opened, the through hole 8 of the frame portion 7 of the filter member 4 is opened as a drain passage, so that the filter member as shown in FIG. The water in the water conduit 2 on the upper side of 4 (downstream in the water passage direction) passes through the through hole 8 to the lower side of the filter member 4 (upstream in the water passage direction). Thereby, even if the water remaining on the upper side (downstream in the water flow direction) of the filter member 4 and coming into contact with the filter function part 6 cannot pass through the filter function part 6 in the reverse flow direction due to its surface tension, the through-hole 8 Therefore, the water can be drained reliably.

  In the present embodiment, as a modification having the basic configuration, an urging member 14 such as a spring is provided between the filter member 4 and the moving member 5 inside the cylindrical body 3 as shown in FIG. You can also. The urging member 14 is set so that the urging force is set to be weaker than the flowing water pressure at the time of water flow, and is urged in a direction in which the moving member 5 is separated from the filter member 4. According to this, since the moving member 5 is separated from the filter member 4 except when water is passed, the through hole 8 which is a drainage passage is opened, so that water can be drained through the filter member 4 quickly. It can be carried out. In addition, since the moving member 5 can be forcibly separated from the filter member 4 when the water flow is stopped, it is in a lateral orientation such that the upstream end and the downstream end of the cylindrical body 3 face each other horizontally. Even if the filter device 1 is provided, it is possible to drain water from the downstream side of the filter member 4 in the water flow direction without any trouble.

  Moreover, in the above embodiment, although the through-hole 8 was provided in the frame part 7 which is a part of the filter member 4 and this through-hole 8 was used as the drainage passage, other implementations were shown in addition to this. As shown in FIG. 7, as another form, another channel 16 may be formed on a part of the inner wall of the cylinder 15 forming the water channel, and this may be used as a water drainage passage. The other flow path 16 communicates with the downstream end of the filter member 17 in the water passage direction and the upstream end of the water passage direction so as to bypass the filter member 17.

  The filter member 17 includes a filter function part 18 formed in a disc shape and a frame part 19 surrounding the periphery thereof, and is provided so as to cover the upper end (downstream end in the water passage direction) inside the cylinder 15. The frame portion 19 is not provided with the through hole 8 (see FIG. 1) as in the above-described embodiment.

  Then, the moving member 20 rises due to the flowing water pressure when passing water, and closes the other flow path 16 on its side surface. At this time, the side surface of the moving member 20 corresponds to the blocking portion in the present invention. When the water flow is stopped, the moving member 20 is lowered to open the other flow path 16. Thereby, the water in the water conduit 21 on the upper side (downstream side in the water flow direction) of the filter member 17 is discharged to the lower side (upstream side in the water flow direction) of the filter member 17 through the other flow path 16. Drainage is surely performed.

  In this case as well, although not shown, an urging member such as a spring may be provided between the filter member 17 and the moving member 20 inside the cylinder 15.

  Further, although not shown, for example, the filter member 4 shown in FIG. 1 is provided in the cylindrical body 15 including the other flow path 16 shown in FIG. 7, and the through-holes 8 ( The drainage passage of the present invention may be constituted by the other flow path 16 (see FIG. 7) provided in the cylindrical body 15 and the cylinder 15 (see FIG. 2). According to this, at the time of draining water, it is possible to drain water efficiently by setting the flow rate of water passing through the drainage passage to be relatively large.

  DESCRIPTION OF SYMBOLS 1 ... Filter apparatus, 3, 15 ... Tube (water flow path), 4 ... Filter member, 5, 20 ... Moving member, 6, 18 ... Filter function part, 8 ... Through-hole (water drain passage), 16 ... Other Channel (drainage passage).

Claims (4)

In the filter device provided in the water flow path forced to flow in one direction,
A filter member having a filter function part for removing foreign matter from water passing therethrough and fixed to the water flow path, and provided on the upstream side in the water flow direction of the filter member, and on the downstream side in the water flow direction due to the flowing water pressure at the time of water flow And the residual water remaining on the downstream side of the filter member without passing through the filter function unit when the water drains in the direction opposite to the direction of water flow. A drainage passage to pass through,
The said moving member is provided with the obstruction | occlusion part which obstruct | occludes a drainage channel | path, without obstruct | occluding the said filter function part, when it moves downstream in the water flow direction. The water flow path in the region where the filter member and the moving range of the moving member are provided is provided in a posture in which the upstream side in the water passage direction faces downward and the downstream side in the water passage direction faces upward.
The moving member is movable in the vertical direction in the water flow path, and is moved up by the flowing water pressure at the time of water flow and moved upstream in the water flow direction. The filter device according to claim 1, wherein the filter device moves to the side.   The filter device according to claim 1, wherein the drainage passage is formed in a part of the filter member.   The filter device according to any one of claims 1 to 3, wherein the drainage passage is formed in a part of an inner wall of the water flow path.

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