JP2016205556A - valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve capable of stably operating a spool.SOLUTION: In a valve 10, between the inner wall of a slide passage 4 and a spool lower part 18, formed is a proximity part 34 at which the inner wall of the slide passage 4 and a proximity guide part 20 is proximate to each other, and opposite cavity parts 35 are formed with an interval by the inner wall of the slide passage 4 and a cavity formation part 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a valve for controlling the amount of water in a handpiece used, for example, in dental treatment.

  Conventionally, handpieces are used in dental treatment, and for example, a handpiece that does not require electrical control uses a valve to adjust the amount of water. As such a valve, for example, there is a flow rate adjusting valve described in Patent Document 1 below. In the flow rate adjusting valve, a spool is disposed in a sliding tube that communicates an inflow passage and an outflow passage, and the valve portion is opened and closed by moving the spool in the sliding tube. In this flow control valve, in order to stabilize the operation by moving the spool straight in the axial direction within the sliding tube, the spool is moved as close as possible to the sliding tube, and the clearance between the spool and the sliding tube is reduced. It is. As a result, when the nozzle at the tip of the spool is pushed by the rod and the spool moves, the pressing force is concentrated in the moving direction by being guided by the sliding tube, and no extra load is applied to the spool.

Japanese Utility Model Publication No. 61-85701

  However, as described above, the flow rate adjusting valve described in Patent Document 1 has the spool as close as possible to the sliding tube, and the clearance between the spool and the sliding tube is formed narrow, so that the flowing liquid can be reduced. The contained impurities may clog the clearance. That is, if the liquid is oil or the like, impurities are less likely to be generated. However, for example, when the liquid is domestic water or hard water, impurities such as calcium are precipitated in the sliding tube. May accumulate and clog clearance. In this case, an extra load is applied to the spool, the operation becomes unstable, and a defective valve operation occurs. Even if the liquid is soft water, if shale beads (calcium-based alkaline agent) are used to prevent rusting due to acidic components, calcium may be deposited, resulting in poor valve operation.

  The present invention has been proposed in view of the above circumstances. That is, an object of the present invention is to provide a valve that can operate the spool stably.

  In order to achieve the above object, in the valve according to the present invention, a spool is disposed in a sliding path that communicates the inflow path and the outflow path, and the spool moves in the sliding path, so that the sliding In a valve that opens and closes a valve portion formed in a path to form a flow path from the inflow path to the outflow path, between the inner wall of the slide path and the spool, the inner wall of the slide path and the A proximity portion close to the spool and a gap portion where the inner wall of the sliding path and the spool face each other with a gap are formed.

  The valve according to the present invention is characterized in that the spool is provided with a proximity guide portion that forms the proximity portion and a gap forming portion that forms the gap portion.

  The valve according to the present invention is characterized in that the spool has a polygonal cross section.

  In the valve according to the present invention, the inner wall of the sliding path is formed in a substantially cylindrical shape, and the proximity portion is in line contact with the inner wall of the sliding path along the flow direction in the sliding path. It is a feature.

  In the valve according to the present invention, a plurality of the gaps are formed at equal intervals along the circumference of the spool, and the cross-sectional area of one of the gaps is a cross-section of the slide path. It is characterized by being about 2.88% to about 19.53% of the cross-sectional area at.

  The valve according to the present invention has the above-described configuration. With this configuration, even if impurities are deposited in the sliding path, the impurities pass through the gap and do not accumulate in the clearance between the inner wall of the sliding path and the spool, so the impurities may be clogged. Absent. Further, since the spool is guided by the proximity portion, when the spool is pushed and moved in the sliding path, the pressing force is concentrated in the moving direction by being guided by the proximity portion, and an extra load is not applied to the spool. . Therefore, the spool can be operated stably.

The valve | bulb which concerns on embodiment of this invention is shown, (a) is the external appearance front view seen from the front, (b) is the external appearance top perspective view seen from the upper part, (c) is the external appearance bottom perspective view seen from the downward direction. is there. The valve | bulb which concerns on embodiment of this invention is shown, (a) is side surface AA cross-sectional enlarged view seen from the side surface, (b) is principal part BB cross-sectional enlarged view. It is a disassembled side view of the valve | bulb which concerns on embodiment of this invention. It is an exploded bottom perspective view of a valve concerning an embodiment of the present invention. The process of the operation | movement of the valve | bulb which concerns on embodiment of this invention is shown, (a) is operation | movement sectional drawing of the state by which the valve part was obstruct | occluded, (b) is operation | movement sectional drawing of the state by which the valve part was open | released.

  Below, the valve concerning the embodiment of the present invention is explained based on a drawing. 1 and 2 show a valve 10 according to an embodiment of the present invention, and FIGS. 3 and 4 show a disassembled valve 10. In the following description, FIG. 1A is the front, and the left and right in FIG. 1 are the side surfaces (sides). Moreover, the upstream side of the flow path in the valve 10 is set to the lower side, and the downstream side is set to the upper side (see FIG. 5).

  As shown in FIG. 1, the valve 10 according to the present embodiment has a hexagonal column shape, and as shown in FIG. 2, a valve mechanism is formed therein. In front of the valve 10, an inflow path 1, an outflow path 2, and an air supply path 3 are opened, and a sliding path 4 that connects the inflow path 1 and the outflow path 2 is formed inside. A spool 17 is disposed in the sliding path 4, and a valve portion 16 is formed by a part of the sliding path 4 and the spool 17. By moving the spool 17 in the sliding path 4, the valve portion 16 is opened and closed to form the flow path 5 from the inflow path 1 to the outflow path 2. The outflow passage 2 is also opened on the back surface and communicated with the sliding passage 4 (see FIG. 2), and the air supply passage 3 is also formed on the side surface (see FIG. 4).

  As shown in FIGS. 2, 3, and 4, each member is attached to the valve 10 from above and below with the main body member 11 as a boundary. The lower side is attached to the first coil spring 12 disposed around the sliding path 4, the spring receiving member 13 in which the lower side of the first coil spring 12 is accommodated, and the lower surface of the main body member 11 circulated. There are a lower body member 14 that closes the path 5 and a variable member 15 that is sandwiched between the body member 11 and the lower body member 14. On the other hand, on the upper side, the spool 17, the members attached to the spool 17 (packing 23, packing receiving member 24, spring metal seat 25 and guide nut 26), the second coil spring 27, and the body member 11 There are a lid member 28 attached to the direction and an O-ring 29 disposed between the lid member 28 and the main body member 11.

<Main body member>
The main body member 11 is formed with the flow passage 5 penetrating in the vertical direction. The flow path 5 is formed with a sliding path 4 in the center, and is divided into upper and lower sections with the sliding path 4 as a boundary to form a lower flow path 6 and an upper flow path 7. The downward flow passage 6 is a cylindrical space, while the upward flow passage 7 is a cylindrical space having a smaller diameter than the downward flow passage 6. The downward flow passage 6 communicates with the inflow path 1 opened on the front side (right side in FIG. 2) of the main body member 11. On the other hand, the upper flow passage 7 communicates with the outflow passage 2 opened on the front surface (right side in FIG. 2) and the back surface (left side in FIG. 2) of the main body member 11. An annular portion 30 is formed at the boundary between the lower flow passage 6 and the upper flow passage 7. The annular portion 30 has an inner peripheral edge protruding upward to form an annular upper protrusion 31 and an inner peripheral edge downward to form a cylindrical lower cylindrical protrusion 32. Has been. A sliding path 4 is formed inside the cylindrical lower protrusion 32. The cylindrical lower protrusion 32 communicates with the flow passage 1 through the lower flow passage 6.

<First coil spring, spring receiving member, lower body member, variable member>
The first coil spring 12 is attached around the cylindrical lower protrusion 32. The spring receiving member 13 has a container shape formed by raising the side surface from the edge of the circular bottom, and accommodates the lower end of the first coil spring 12. The variable member 15 has a flat sheet shape, for example, silicon rubber. The lower main body member 14 has an upper surface depressed to form a depressed portion 33. The lower main body member 14 is fixed to the lower surface of the main body member 11 with screws, with the variable member 15 sandwiched between the lower main body member 14 and the main body member 11.

<Spool>
The spool 17 is rod-shaped and includes a spool lower part 18 and a spool upper part 19. The spool lower portion 18 has a hexagonal cross section, and a proximity guide portion 20 and a gap forming portion 21 are formed. The proximity guide portion 20 is a hexagonal apex portion (corner portion) in the cross section of the spool lower portion 18, while the gap forming portion 21 is a hexagonal side portion (surface portion). Since the spool 18 may rotate with the momentum of the water flow when the liquid flows, the spool lower section 18 may have a polygonal shape such as a triangle as long as the cross section of the spool lower portion 18 is easy to rotate. .

  The spool upper portion 19 has a rod-like shape, and a flange 22 is formed. A packing 23 penetrates together with the packing receiving member 24 and is mounted on the flange 22. The spring metal washer 25 is mounted on the packing receiving member 24, and is tightened by a guide nut 26 via the spring metal washer 25, so that the packing 23 and the packing receiving member 24 are fixed to the flange 22.

  In this state, the lower side of the spool 17 is inserted into the sliding path 4 from above the main body member 11. As shown in FIG. 2B, the sliding path 4 has a proximity portion 34 formed by the proximity of the inner wall and the proximity guide portion 20 of the spool lower portion 18, and the formation of a gap between the inner wall and the spool lower portion 18. A gap portion 35 is formed so as to face the portion 21 with a gap. That is, in the proximity portion 34, the proximity guide portion 20 is in line contact with the inner wall of the sliding path 4 or infinitely close to the inner wall of the sliding path 4 along the flow direction in the sliding path 4. On the other hand, six gap portions 35 are formed at equal intervals along the periphery of the spool lower portion 18. If the cross section of the slide path 4 is circular, but the cross section of the spool lower part 18 is a regular hexagon, the total cross-sectional area of the six gaps 35 in the cross section of the slide path 4 is the slide path. 4 is about 16.5% to about 18.5%, particularly preferably about 17.3%. (Of the cross-section of the sliding path 4, the cross-sectional area of one gap portion 35 is about 2.75% to about 3.08%, especially about 2.88% of the cross-sectional area of the sliding path 4. Is preferred). Further, if the cross section of the sliding path 4 is circular and the cross section of the spool lower portion 18 is an equilateral triangle, the total cross-sectional area of the three gaps 35 in the cross section of the sliding path 4 is the sliding section. It is preferably about 57.5% to about 59.5% of the cross-sectional area in the movement path 4, and particularly preferably about 58.6% (the cross-sectional area of one gap portion 35 in the cross-section of the sliding path 4). Is about 19.16% to about 19.83% of the cross-sectional area in the sliding path 4, and is particularly preferably about 19.53%). In order to prevent the rotation of the spool 17 caused by the water flow, the cross-sectional areas of the gap portions 35 formed by the proximity guide portion 20 and the gap formation portion 21 should be evenly provided. The shape such as a regular hexagon is particularly excellent.

<Second coil spring, lid member, O-ring>
With the spool 17 attached to the sliding path 4, the second coil spring 27 is attached around the guide nut 26. The lid member 28 is fixed to the upper surface of the main body member 11 with screws with an O-ring 29 interposed between the lid member 28 and the main body member 11.

<Valve part>
The valve portion 16 is composed of an annular upper protrusion 31 of the annular portion 30 and a packing 23 attached to the spool upper portion 19. That is, when the spool 17 moves up and down the sliding path 4, the packing 23 attached to the spool 17 comes into contact with or separates from the annular upper protrusion 31, and the flow passage 5 opens and closes.

  As described above, the valve 10 according to the present embodiment is formed. In addition, by forming irregularities on the inner wall of the sliding path and the lower surface of the spool, the inner wall of the sliding path and the spool are close to each other between the inner wall of the sliding path and the lower part of the spool. A part may be formed, and similarly, a gap part in which the inner wall of the sliding path and the lower part of the spool face each other with a gap may be formed. Specifically, the cross section of the lower portion of the spool may be a polygonal shape such as a triangle, or a shape in which irregularities are formed along the outer periphery. Further, the cross section of the lower part of the spool is circular, and irregularities are formed along the circumference on the inner wall of the sliding path, so that the part close to the clearance between the lower part of the spool and the inner wall of the sliding path along the flow direction. In addition, voids may be formed.

  Next, the operation of the valve 10 will be described with reference to the drawings. FIG. 5 shows a process of operation of the valve 10 according to the embodiment of the present invention.

  In the valve 10 before the liquid such as water is supplied, the spring receiving member 13 is pushed downward by the elastic force of the first coil spring 12, as shown in FIG. Further, the spool 17 is pushed downward by the elastic force of the second coil spring 27 and the spool 17 is lowered, and the packing 23 attached to the upper part 19 of the spool is moved to the annular portion by the elastic force of the second coil spring 27. It is pressed against 30 annular protrusions 31. That is, the valve portion 16 is closed. In this state, liquid is supplied.

  As shown in FIG. 5A, the liquid flows in from the inflow path 1, and the liquid fills the downward flow path 6 and the sliding path 4. Since the valve portion 16 is closed, the liquid does not flow to the upper flow passage 7.

  As shown in FIG. 5B, when the air is supplied from the air supply path 3 of the lower main body member 14 and the depressed portion 33 is filled with air, the variable member 15 swells upward by air pressure. Change. The spring receiving member 13 disposed on the upper surface of the variable member 15 is pushed by the variable member 15 and lifted upward against the elastic force of the first coil spring 13. At the same time, the spool 17 is also lifted upward by the spring receiving member 13 against the elastic force of the second coil spring 27, and the packing 23 attached to the spool upper portion 19 is separated from the annular upper protrusion 31, and the valve portion 16 opens. When the valve portion 16 is opened, the liquid flows into the upper flow passage 7 from between the packing 23 and the annular upper protrusion 31 and flows out of the valve 10 from the outflow passage 2.

  As shown in FIG. 5A, when the supply of air is cut off (or sucked) and the air is removed from the depressed portion 33, the pressure is reduced and the variable member 15 changes so as to be depressed downward. . The spring receiving member 13 disposed on the upper surface of the variable member 15 is pushed downward by the elastic force of the first coil spring 12. At the same time, the spool 17 is also lowered by the elastic force of the second coil spring 27, the packing 23 is pressed against the annular upper protrusion 31, and the valve portion 16 is closed. When the valve portion 16 is closed, the liquid stays between the packing 23 and the annular upper protrusion 31, stops flowing into the upper flow passage 7, and stops flowing out from the outflow passage 2 to the outside of the valve 10. .

  If the impurities contained in the liquid are deposited in the gap 35 of the sliding path 4 (clearance between the inner wall of the sliding path 4 and the gap forming part 21 of the spool lower portion 18), the impurities are removed from the gap 35. And passes through the sliding path 4.

  Next, the effect of the valve 10 will be described.

  As described above, according to the present embodiment, the spool 17 has a hexagonal cross section, and the spool lower portion 18 includes a proximity guide portion 20 that is a hexagonal apex portion (corner portion) and a hexagonal side portion ( A void forming portion 21 that is a surface portion) is formed. The sliding path 4 is formed with a proximity portion 34 formed by the proximity of the inner wall and the proximity guide portion 20 of the spool lower portion 18, and a gap portion where the inner wall and the gap forming portion 21 of the spool lower portion 18 face each other with a gap therebetween. 35 is formed. With this configuration, if impurities contained in the liquid are deposited in the gap 35 of the sliding path 4 (clearance between the inner wall of the sliding path 4 and the gap forming part 21 of the spool lower portion 18), the impurities are Impurities are not clogged in the clearance between the inner wall of the sliding path 4 and the gap forming part 21 through the sliding path 4 through the gap 35. Therefore, the spool 17 can be stably operated.

  Furthermore, the proximity guide part 20 is in line contact with the inner wall of the sliding path 4 or infinitely close to the inner wall of the sliding path 4 along the flow direction in the sliding path 4. With this configuration, since the spool 17 is guided by the proximity guide unit 20, when the spool 17 is pushed and moved in the sliding path 4, the pressure is guided by the proximity guide unit 20 and concentrated in the moving direction. No extra load is applied to the spool 17. Therefore, the spool 17 can be stably operated.

  According to the present embodiment, if the cross section of the spool lower portion 18 is a regular hexagon, six gap portions 35 are formed at equal intervals along the periphery of the spool lower portion 18. The cross-sectional area of the two gap portions 35 is about 2.75% to about 3.08% of the cross-sectional area of the sliding path 4, and particularly about 2.88% (if the cross section of the spool lower portion 18 is an equilateral triangle, Three gaps 35 are formed at equal intervals along the periphery of the spool lower portion 18, and the cross-sectional area of one of the gaps 35 is about 19 of the cross-sectional area of the slide path 4. .16% to about 19.83%, especially about 19.53%). Therefore, even if the impurities contained in the liquid are deposited, the impurities smoothly pass through the gap 35. Therefore, the spool 17 can be operated more stably.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to the said embodiment. The present invention can be modified in various ways without departing from the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Inflow path 2 Outflow path 3 Air supply path 4 Sliding path 5 Flow path 6 Lower flow path 7 Upper flow path 10 Valve 11 Main body member 12 1st coil spring 13 Spring receiving member 14 Lower main body member 15 Variable member 16 Valve part 17 Spool 18 Spool lower part 19 Spool upper part 20 Proximity guide part 21 Gap forming part 22 Flange 23 Packing 24 Packing receiving member 25 Spring metal washer 26 Guide nut 27 Second coil spring 28 Lid member 29 O-ring 30 Annular part 31 Upper ring part 32 Cylinder lower protrusion 33 Depressed part 34 Proximity part 35 Cavity part

Claims (5)

A spool is disposed in a sliding path communicating with the inflow path and the outflow path, and the spool moves in the sliding path to open and close a valve portion formed in the sliding path from the inflow path. In the valve forming the flow path to the outflow path,
Between the inner wall of the sliding path and the spool, a proximity part in which the inner wall of the sliding path and the spool are close to each other, and a gap part where the inner wall of the sliding path and the spool face each other with a gap. And formed,
A valve characterized by that. In the spool,
A proximity guide part forming the proximity part;
A gap forming part for forming the gap part,
The valve according to claim 1. The spool has a polygonal cross-section;
The valve according to claim 1 or 2, characterized by the above-mentioned. The inner wall of the sliding path is formed in a substantially cylindrical shape,
The proximity portion is in line contact with the inner wall of the sliding path along the flow direction in the sliding path.
The valve according to any one of claims 1 to 3, wherein the valve is provided. A plurality of the gaps are formed at equal intervals along the circumference of the spool;
Of the cross-section of the sliding path, the cross-sectional area of one of the gaps is about 2.88% to about 19.53% of the cross-sectional area of the sliding path.
The valve according to any one of claims 1 to 4, wherein the valve is provided.

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