JP4459779B2 - On-off valve - Google Patents

Description

  The present invention relates to an on-off valve for temporarily storing and opening and closing a heavy fluid, for example, a mixture of a solid material such as sand and water.

  Conventionally, when a mixed fluid such as sand and water is stopped like this type of fluid, a pinch valve using a rubber hose is generally used. However, as the valve diameter increases, the amount of displacement of the rubber as the valve body also increases, which places an unreasonable load on the rubber itself, and when the amount of displacement increases, the required length dimension is also required. As the size of the valve increases, the inter-surface dimension of the valve body inevitably increases.

  When a lid structure such as a swing check valve is used, it becomes impossible to seal if solid matter is sandwiched between the seats of the valve body and the valve body. . Further, as the diameter increases, the load on the shaft portion becomes very large, and there is a problem in terms of reliability. Moreover, when the sheet | seat surface is comprised with the metal, even if the solid substance was washed away, the damage | wound by a solid substance remained in the sheet | seat surface, and there also existed a fault which cannot be sealed reliably.

  In order to solve such a problem, Japanese Patent Laid-Open No. 2002-295704 (Patent Document 1) is disclosed. In this publication, an annular valve seat is provided at the lower end portion of the valve main body for storing fluid, and a flexible valve body having one end fixed is provided at a position in the vicinity of the annular valve seat, and the vicinity of the lower end of the valve main body is provided. An open / close valve that opens and closes the valve port of the valve body by pressing and separating the flexible valve body against the annular valve seat with a pressing body that is movably mounted on the valve body. It is disclosed as an on-off valve that can be sealed to the same and has a dimension between surfaces as short as possible.

Further, in Japanese Patent Laid-Open No. 2002-68125 (Patent Document 2), a flap valve is configured by a valve body, a support body, and an opening / closing shaft, and the valve body is supported by a pin connection between the valve body and the support body. The support body and the opening / closing shaft are coupled by a key. The pin connection between the valve body and the support body is configured by providing a gap. When the air cylinder reciprocates, the opening and closing shaft reciprocates through the link, the support body swings, and the valve body It is a structure that opens and closes the opening of the protruding end of the material discharge pipe.
JP 2002-295704 A JP 2002-68125 A

  However, in Japanese Patent Laid-Open No. 2002-295704 (Patent Document 1), the valve seat is sealed by pressing the flexible valve body against the valve seat using a pressing body that slides in the horizontal direction. In the lateral direction of the valve body, it was necessary to secure a slide space for the pressing body as well as installation space for the hydraulic and pneumatic cylinders. In particular, an open / close valve with a small installation space that can be accommodated in a frame of an existing concrete manufacturing apparatus (batcher plant apparatus) has been demanded.

  In Japanese Patent Laid-Open No. 2002-68125 (Patent Document 2), since the space for rotating the support is small, it is not necessary to secure a large opening / closing space for the valve body, but the rotation axis of the support is fixed. In this state, the support is rotated, so that when the support is rotated, a load is repeatedly applied to the rotation shaft, and the rotation shaft is significantly worn and deteriorated. It was. This wear / deterioration of the rotating shaft causes the position of the support relative to the valve seat to fluctuate, thereby significantly reducing the valve seat sealing performance. In addition, the position variation of the support body has a great influence on other components, particularly the valve body, so that it may not function as an on-off valve.

  The present invention has been developed as a result of diligent research in view of the above-mentioned problems, and the object of the present invention is to achieve excellent operability by reducing the open / close space and downsizing, and the configuration. It is an object of the present invention to provide an on-off valve that realizes maintaining the excellent valve seat sealing performance over a long period of time by reducing the influence of wear and deterioration of parts.

In order to achieve the above object, the invention according to claim 1 is provided with a cylindrical valve body for storing a heavy fluid containing solid matter in a vertical state and provided at the lower end of the valve body. An annular valve seat that is horizontal with respect to the valve body is provided at the valve port, and an extending portion provided in the vicinity of the valve port is provided perpendicular to the annular valve seat, and the extending portion is flexible. One end of the valve body is fixed in a undulating manner, and the ends of the rods of a pair of drive means provided on both sides of the valve body are connected to both side surfaces provided facing both ends of the pressing surface of the substantially U-shaped pressing body. The flexible valve body is pressed by the pressing surface to close the annular valve seat, and the guide groove provided on both sides of the valve body is provided with a rotation fulcrum of the pressing body. A certain shaft portion is slidably engaged, and the guide groove is a straight groove portion provided along the drive direction of the rod. The straight groove portion is an inclined groove portion that is inclined toward the extending portion side, and the shaft portion is disposed on the fixed portion side of the flexible valve body at a position lower than the connecting member in the valve closed state. The open / close valve is configured to open and close the valve port by providing the pressing body and the flexible valve body up and down with the shaft portion as a pivot point by the vertical movement of the rod .

The invention according to claim 2 is an on-off valve in which the pressing surface of the pressing body has an inclined surface with a thickness toward the fixed portion side of the valve body.

  According to the first aspect of the present invention, since the shaft portion of the pressing body, which is the rotation fulcrum, is movably provided along the drive direction of the drive means of the valve body, the load on the shaft portion is not opened when the valve body is opened and closed. Therefore, it is possible to reduce the wear / deterioration of component parts, which has been a problem in the past, especially the load on the shaft, and to reduce the influence of the wear / deterioration. It has become possible to provide on-off valves that ensure seat sealing. Furthermore, it has become possible to provide an on-off valve that is excellent in economic efficiency and can effectively use the arrangement space while realizing an excellent operability by suppressing the on-off space. Furthermore, by realizing compactness, for example, it can be easily accommodated in the frame of an existing batcher plant apparatus.

In addition , the pressing body can be quickly retracted from the valve bore area, thereby rapidly reducing the support area of the flexible valve body and allowing the flexible valve body to tilt more quickly. It is possible to effectively suppress the accumulation of fluid on the valve body.

Furthermore , the wear and deterioration of components, especially the load on the shaft, is reduced, and the influence of the wear and deterioration is reduced to provide an on-off valve that ensures excellent valve seat sealing for a long period of time. Became feasible. Furthermore, it has become possible to provide an on-off valve that is compact and capable of effectively using the arrangement space and that is excellent in economic efficiency while suppressing the on-off space and realizing excellent operability.
According to the second aspect of the present invention, even if the connecting portion with the driving means (pneumatic cylinder) is eccentric from the valve body, a reliable valve seat seal can be achieved via the pressing body.

  An embodiment of an on-off valve according to the present invention will be described in detail with reference to the drawings. 1 is a front view showing a fully opened state of the on-off valve in the present invention, FIG. 2 is a side view showing a fully closed state of the on-off valve in the present invention, and FIG. 3 is a partially cutaway view in FIG. 4 is an enlarged cross-sectional view, FIG. 4 is a cross-sectional view taken along line AA in FIG. 2, and FIGS. 5 and 6 are side views showing an operation state of the on-off valve in the present invention in the valve opening and closing direction. FIG. 7 is a side view showing a fully opened state of the on-off valve in the present invention.

  As shown in FIGS. 1 and 2, reference numeral 1 in the figure is a metal valve body that also serves as a measuring tank having a cylindrical shape and a predetermined volume. In this example, a fluid having a diameter of 360 mm and about 100 kg can flow in. It has a volume. On the lower surface of the flange portion 2 formed on the upper outer peripheral portion of the valve body 1, measuring portions such as a load cell (not shown) are arranged uniformly. As shown in FIG. 3, the lower end of the valve body 1 is formed with a lower end portion in a horizontal state to provide a valve port 3, and the mounting flange portion 4 is formed integrally or separately in the valve port 3. And the extension part 5 is bend-formed in the end. An annular valve seat 7 made of rubber such as SBR or NR is provided on the lower surface of the mounting flange portion 4 via an annular metal plate 6, and the mounting flange portion 4 is formed using a hexagon socket bolt 8. It is fixed in a horizontal state. Further, a gasket 9 such as SBR or NR is attached between the metal plate 6 and the attachment flange portion 4.

  As shown in FIG. 3, the extending portion 5 of the mounting flange portion 4 has a flap-like flexible valve body 10 made of rubber containing reinforcing fibers such as SBR or NR and having a thickness of about 9 to 12 mm. However, it is fixed with bolts 12 via a metal pad 11. The flexible valve body 10 is provided so that it can be raised and lowered and hermetically sealed against the annular valve seat 7 with one end fixed. In this example, the flexible valve body 10 is fixed along the extending portion 5 provided perpendicular to the annular valve seat 7, and the flexible valve body 10 is fixed from the fixed position to the annular valve seat 7. The valve is fully closed by flexing about 90 degrees to the side, while the valve is fully opened when the valve is separated from the fixed position in a substantially horizontal state.

  In the figure, reference numeral 13 denotes a pressing body having a U-shaped cross section, which is composed of a pressing surface 14 having a rectangular shape in plan view, and side portions 15 and 15 erected from both edges of the pressing surface 14. Although the pressing body 13 is formed of a metal plate, in order to reduce friction with the flexible valve body 10 on the surface of the pressing surface 14, a member having a small friction coefficient such as PTFE or ultrahigh molecular weight polyethylene is pasted, Or you may coat. As another example, a taper pressing surface having an inclination angle (for example, about 5 degrees) with the pressing surface 14 as an upper surface, that is, the pressing surface 14 increases in thickness toward the fixed portion side of the flexible valve body 10. By using the inclined surface, a reliable valve seat seal via the pressing body 13 can be realized even if the connecting portion with the driving means described later is eccentric from the valve body 1.

  In the figure, 16 is a driving means such as a hydraulic, pneumatic or electric actuator. In this example, a double-action pneumatic cylinder 16 for supplying air to the cylinder every time the valve is opened and closed is used. The valve body 1 is disposed via a support member. As shown in FIG. 1, two pneumatic cylinders 16, 16 are disposed near both upper sides of the valve body 1, and the pressing body 13 is rotatably provided between the tips of rods 17 of each cylinder 16. Yes. As shown in FIG. 4, an engagement recess 18 a is formed in the connecting member 18 attached to the tip of each rod 17, and the retaining ring 20 attached to the engagement recess 18 a is connected to the side surface of the pressing body 13. The coupling member 19 fixed to the engagement member 19 is engaged with the engagement recess 19a so as to be rotatable. Of course, the connection structure shown in this example is an example, and the present invention is not limited to this. In the figure, reference numerals 16a and 16b denote supply / exhaust pipes for connecting the pneumatic cylinder 16 and an air pressure supply source (not shown).

  As shown in FIG. 4, a bolt 22 is screwed onto the side surface portion 15 of the pressing body 13 so as to be integrally fixed to a female screw portion, in this example, a hex nut 21, and protrudes inward of the pressing body 13. It has the axial part 23 comprised by this. The shaft portion 23 is a rotation fulcrum of the pressing body 13, and as shown in FIG. 2, is provided below the connecting member 19 in the valve closed state and provided on the fixed portion side of the flexible valve body 10. Yes. The shaft portion 23 has a feature that it can move along the driving direction of an appropriate driving means provided in the valve body 1. Therefore, in this example, the pressing body 13 is provided so as to be movable along with the shaft portion 23 along the vertical movement of the rod 17. Further, the shaft portion 23 is slidably engaged with a long guide groove 25 provided in a guide portion 24 described later, and in the guide groove 25 in conjunction with the up and down movement of the rod 17. Is configured to slide. Of course, the configuration of the shaft portion 23 shown in this example is an example, and the present invention is not limited to this.

  In the figure, reference numeral 24 denotes a guide portion provided integrally or separately on both lower sides of the valve body 1, and a linear groove portion 25 a provided along the driving direction of the rod 17, and the linear groove portion 25 a is extended and inclined. It has a long guide groove 25 composed of an inclined groove portion 25b extending in the direction (in this example, a direction inclined 45 degrees toward the fixed portion side), and the shaft portion 23 of the pressing body 13 is guided by the linear groove portion 25a, While the flexible valve body 10 is closed, the shaft portion 23 of the pressing body 13 is guided by the inclined groove portion 25b to open the flexible valve body 10. That is, as the shaft portion 23 moves, the pressing body 13 is raised and lowered, and the flexible valve body 10 is pressed against and separated from the annular valve seat 7. As the axis of the straight groove 25a is closer to the central axis of the valve body 1, a uniform valve seat seal is realized. Therefore, as shown in FIG. 2, in this example, the axis Y1 of the straight groove 25a and the valve body 1 center axis Y2 is provided so that it may be located on the same axis.

  Further, the length of the linear groove 25a is such that the shaft portion 23 can be moved further upward in the valve closed state, and the pressing surface 14 of the pressing body 13 and the annular valve from the valve closed state to the valve slightly opened state. The length of the shaft portion 23 is such that it can be guided so that the seat 7 is parallel. The inclined groove portion 25b is formed to a height slightly above the fixed portion of the flexible valve body 10 continuously from the lower end of the linear groove portion 25a.

  Next, the operation of the above embodiment will be described. The opening / closing operation of the opening / closing valve in this example will be described in sequence. When the fluid in the valve body 1 is allowed to flow out, the two pneumatic cylinders 16, 16 provided near both upper sides of the valve body 1 in the state of FIG. When driven, the pair of rods 17, 17 located on both sides of the valve body 1 starts to advance. At the same time, as shown in FIGS. 5 and 6, the shaft portion 23 located in the linear groove portion 25a is guided to the inclined groove portion 25b, and at the same time, the pressing body 13 is moved to the right side (of the flexible valve body 10). It moves away from the valve port 3 while gradually swinging up (fixed part side). Thereby, the pressing state of the flexible valve body 10 is sequentially released, and the flexible valve body 10 is separated from the annular valve seat 7 so as to hang down from the tip.

  At this time, the pressing body 13 can be quickly retracted from the valve aperture area, thereby rapidly reducing the support area of the flexible valve body 10 and speeding up the tilting of the flexible valve body 10. It is possible to effectively suppress the accumulation of fluid on the sex valve body 10, thereby maintaining the valve seat sealability when the valve is closed. Further, when the cylinders 16 and 16 are driven, as shown in FIG. 7, the pressing body 13 inclined and moved to the inclined groove portion 25b rotates with the shaft portion 23 contacting the lower end of the inclined groove portion 25b as a rotation fulcrum. As shown in the figure, the valve body 1 is in a fully opened state and allows the fluid to flow out from the valve port 3. Moreover, by providing the entanglement preventing member 26, it is possible to prevent the flexible valve body 10 from being entangled rearward when the valve is opened.

  On the other hand, when the valve is closed, when the cylinders 16 are driven in the state shown in FIG. 7, the pair of rods 17, 17 located in the vicinity of both sides of the valve body 1 starts to retreat. At the same time, the pressing body 13 swings downward in the clockwise direction in the drawing with the shaft portion 23 as a pivot point. Thereafter, as shown in FIGS. 5 and 6, the shaft portion 23 located in the inclined groove portion 25b moves upward along the inclined groove portion 25b. At the same time, the pressing body 13 approaches the valve port 3 while gradually swinging down to the left side in the drawing, and the flexible valve body 10 that has been hung down is scooped up from the rear by the pressing body 13, with respect to the annular valve seat 7. Gradually approach.

  Further, when the cylinders 16 and 16 are driven, as shown in FIG. 2, the shaft portion 23 located in the inclined groove portion 25b is guided to the linear groove portion 25a, and is in a horizontal state as the shaft portion 23 moves. Due to the pressing body 13, the flexible valve body 10 becomes substantially horizontal with respect to the annular valve seat 7, and the primary side of the flexible valve body 10 is formed by the pressing surface 14 of the pressing body 13. 7, the valve port 3 of the valve body 1 is securely sealed. As described above, since the opening / closing valve is configured to raise and lower the pressing body 13 while sliding the shaft section 23 of the pressing body 13 in conjunction with the up-and-down movement of the rod 17 of the cylinder 16, the shaft section 23 is of course. The influence of the abrasion of the flexible valve body 10 can be reduced, and a reliable valve seat sealing performance can be maintained over a long period of time.

  In other words, the pressing body 13 in the valve closed state can move further upward in a state where the shaft portion 23 is guided by the linear groove portion 25 a, so that the flexible valve body 10 is further pressed against the annular valve seat 7. It is possible to reduce the influence of the wear of the shaft portion 23 and the flexible valve body 10 and maintain the valve seat sealing performance.

  In addition, as shown in FIG. 2, when the valve body 1 is in the fully closed state, if a heavy fluid, such as a mixture of solids such as sand and water, is introduced from the inlet 27 of the valve body 1, For example, about 100 kg of fluid is temporarily stored in the main body 1 for measurement, and the fluid can be measured by a measuring unit such as a load cell (not shown). In this case, the flexible valve body 10 made of rubber and the annular valve seat 7 made of rubber are pressed against each other, and the flexible valve body 10 is pressed against the annular valve seat 7 with a strong force to increase the valve seat. Since the sealing property is obtained, a heavy fluid including water and solids can be reliably sealed. Furthermore, unlike the normal pinch valve, the on-off valve in this example is suitable for measuring the amount of fluid because there is no change in the primary volume during opening and closing.

  The on-off valve according to the present invention is suitable for a case where a heavy fluid is temporarily stored for measurement and then flows out. An on-off valve can be used. In this case, a certain amount of aggregate such as sand and water is allowed to flow into the fully closed valve body from the inflow tank, and after metering by the measuring section, the valve port is fully opened and fed to the lower mixer. The mixer mixes a certain amount of aggregates such as sand and water to produce ready-mixed concrete that is the final product.

  The on-off valve according to the present invention is provided as an on-off valve that can be applied not only to a driving source such as a hydraulic, pneumatic or electric actuator as a driving means but also to an on-off valve using a manual force as a driving source. Is possible.

It is a front view which shows the fully open state of the on-off valve in this invention. It is a side view which shows the fully closed state of the on-off valve in this invention. FIG. 3 is an enlarged sectional view partially cut away in FIG. 2. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a side view which shows the operation state to the valve opening / closing direction of the on-off valve in this invention. It is a side view which shows the operation state to the valve opening / closing direction of the on-off valve in this invention. It is a side view which shows the fully open state of the on-off valve in this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve body 7 Annular valve seat 10 Flexible valve body 13 Pressing body 16 Drive means (pneumatic cylinder)
17 Rod 23 Shaft 25 Guide groove 25a Linear groove 25b Inclined groove

Claims (2)

A cylindrical valve body for storing heavy fluid containing solid matter is arranged in a vertical state, and an annular valve seat in a state of being horizontal with respect to the valve body is provided at a valve port provided at a lower end portion of the valve body. An extending portion provided in the vicinity of the valve port is provided perpendicular to the annular valve seat, and one end of the flexible valve body is fixed to the extending portion so as to be undulated, and is substantially U-shaped. The rod ends of a pair of drive means provided on both sides of the valve body are rotatably attached to both side surfaces provided opposite from both ends of the pressing surface of the pressing body via a connecting member, and the flexible on the pressing surface. The valve body is pressed to close the annular valve seat, and the shaft portion, which is the rotation fulcrum of the pressing body, is slidably engaged with the guide grooves provided on both sides of the valve body. A linear groove provided along the drive direction of the rod, and an inclination in which the linear groove is extended and inclined toward the extended portion The shaft portion is disposed on the fixed portion side of the flexible valve body at a position lower than the connecting member in the valve closed state, and the pressing portion is used as a rotation fulcrum by the vertical movement of the rod. An on-off valve characterized in that a body and the flexible valve body are provided in a freely undulating manner to open and close the valve port . The on-off valve according to claim 1 , wherein the pressing surface of the pressing body is an inclined surface with a thickness toward the fixed portion side of the valve body.

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