JP2021050756A - Packing and rotary valve - Google Patents

Abstract

To improve sealing performance at both low and high pressure of a fluid.SOLUTION: A packing body portion 51 of a packing 50 has a through-hole 52 extending in a diametrical direction of a valve body portion 42, and is disposed between the valve body portion 42 and a cylindrical portion 16 while communicating the through-hole 52 with a channel of a fluid. A first sealing portion 53 of the packing 50 projects out from the periphery of the through-hole 52 in the packing body portion 51 to contact with the cylindrical portion 16. A second seal portion 54 and a third seal portion 55 of the packing 50 project out from the periphery of the through-hole 52 of the packing body portion 51 to contact with the valve body portion 42 respectively. The first seal portion 53 to the third seal portion 55 form an annular shape. A distance from an axis L1 of the through-hole 52 to the second seal portion 54 is set to be shorter than a distance from the axis L1 to the first seal portion 53, and a distance from the axis L1 to the third seal portion 55 is set to be longer than a distance from the axis L1 to the first seal portion 53.SELECTED DRAWING: Figure 6

Description

The present invention relates to a packing that suppresses fluid leakage and a rotary valve in which the packing is incorporated.

As a rotary valve that adjusts the flow rate of a fluid by rotating, a rotary valve including a housing and a valve body is known (see, for example, Patent Document 1). In this rotary valve, the housing includes a tubular portion and a closed portion that closes a part of the tubular portion in the length direction. Further, the housing has a space surrounded by a tubular portion and a closed portion as an accommodating portion. The first flow path is connected to the closed portion in a state of being communicated with the accommodating portion, and the tubular portion is connected with the second flow path being communicated with the accommodating portion. The valve body has a valve body portion rotatably arranged in the accommodating portion. The valve body is formed with a movable flow path that guides the fluid that has flowed into the tubular portion from one of the first flow path and the second flow path to the other flow path. Then, by rotating the valve body, the flow path cross-sectional area between the first flow path and the second flow path via the movable flow path is adjusted, and the fluid flows between the first flow path and the second flow path. The amount of fluid is adjusted.

In the rotary valve, packing is used to prevent fluid from leaking from the housing. As shown in FIG. 8, the skeleton portion of the packing 77 is composed of a packing main body 78 having a through hole 79 extending in the radial direction of the valve main body 76 in the valve body 75. The packing main body 78 is arranged between the valve main body 76 and the tubular portion 72 of the housing 71 in a state where the through hole 79 is communicated with the second flow path.

An annular first seal portion 81 in contact with the tubular portion 72 projects from the periphery of the through hole 79 in the packing main body portion 78. Further, an annular second seal portion 82 that contacts the outer peripheral surface of the valve main body portion 76 projects from the periphery of the through hole 79 of the packing main body portion 78. The protruding direction of the first seal portion 81 from the packing main body portion 78 and the protruding direction of the second seal portion 82 are opposite to each other. The distance from the axis L1 of the through hole 79 to the second seal portion 82 is set shorter than the distance from the axis L1 to the first seal portion 81. In other words, the annular second seal portion 82 is formed to have a smaller diameter than the annular first seal portion 81.

The packing 77 is incorporated in the housing 71 in a compressed state. Along with the above compression, a reaction force (hereinafter referred to as "compression reaction force") that pushes back the valve body portion 76 is generated in the packing 77, and the compression reaction force causes a gap between the valve body portion 76 and the second seal portion 82. It is sealed.

Therefore, in the rotary valve 70, the pressure of the fluid is applied to the packing 77. The pressure of the fluid on the outer peripheral side of the packing 77 becomes higher than the pressure of the fluid in the through hole 79. However, the flow of the fluid to the through hole 79 side through between the packing 77 and the tubular portion 72 is regulated by the first seal portion 81. Further, the second seal portion 82 regulates that the fluid flows between the packing 77 and the valve main body portion 76 toward the through hole 79 side.

By the way, in the annular first seal portion 81, the pressure of the fluid acts on the outer peripheral surface thereof. Here, the minimum diameter of the portion where the pressure of the fluid acts on the first seal portion 81 is referred to as the diameter D1. Further, the maximum diameter of the portion of the second seal portion 82 that comes into contact with the outer peripheral surface of the valve body portion 76 is referred to as the diameter D2. As described above, since the second seal portion 82 has a smaller diameter than the first seal portion 81, the diameter D2 of the rotary valve 70 is smaller than the diameter D1.

Therefore, when the packing 77 is assembled in the housing 71 while being compressed, the second seal portion 82 is less likely to be elastically deformed to the side away from the axis L1, that is, outward in the radial direction of the packing main body 78, and the compression reaction Power is hard to escape. Therefore, when the pressure of the fluid on the outer peripheral side of the packing 77 is lower, the fluid is unlikely to leak to the through hole 79 side through between the second seal portion 82 and the valve body portion 76.

Japanese Unexamined Patent Publication No. 2000-193104

However, in the conventional rotary valve 70, as the pressure of the fluid increases, the force F1 of the fluid toward the packing 77 away from the valve body 76 increases. Along with this, there is a problem that the compression reaction force that the second seal portion 82 pushes against the valve main body portion 76 becomes smaller, and the sealability between the second seal portion 82 and the valve main body portion 76 deteriorates.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a packing and a rotary valve capable of enhancing the sealing property at both low pressure and high pressure of a fluid.

The packing that solves the above problems includes a housing that has a tubular portion provided with an accommodating portion and is arranged in the middle of the fluid flow path, and a movable flow path that adjusts the flow path cross-sectional area of the flow path. A packing applied to a rotary valve having a formed valve body and having the valve body rotatably arranged in the accommodating portion in the radial direction of the valve body. A packing main body portion having an extending through hole and being arranged between the valve main body portion and the tubular portion in a state where the through hole is communicated with the flow path, and the through hole in the packing main body portion. A first seal portion that protrudes from the periphery and contacts the tubular portion, and a second seal portion and a third seal portion that project from the periphery of the through hole in the packing body portion and contact the valve body portion, respectively. The first to third seal portions each have an annular shape, and the distance from the axis of the through hole to the second seal portion is shorter than the distance from the axis to the first seal portion, and the above. The distance from the axis line to the third seal portion is set longer than the distance from the axis line to the first seal portion.

Further, the rotary valve that solves the above problems has a tubular portion provided with an accommodating portion, and is movable to adjust the flow path cross-sectional area of the flow path and the housing that is arranged in the middle of the fluid flow path. A packing main body having a valve main body having a flow path formed therein and having the valve main body rotatably arranged in the accommodating portion and a through hole extending in the radial direction of the valve main body. A rotary valve having a skeleton portion and a packing main body having a packing arranged between the valve main body and the tubular portion in a state where the through hole is communicated with the flow path. A first seal portion that contacts the tubular portion protrudes from the periphery of the through hole in the packing main body portion, and a first seal portion that contacts the valve main body portion from the periphery of the through hole in the packing main body portion. The two seal portions and the third seal portion are projected, and the first to third seal portions each form an annular shape, and the distance from the axis of the through hole to the second seal portion is the distance from the axis to the first seal. The distance from the axis to the third seal is set to be shorter than the distance to the portion and longer than the distance from the axis to the first seal.

In the rotary valve in which the packing is incorporated, the packing is compressed between the valve body portion and the tubular portion. Along with this compression, a compression reaction force that pushes back the valve body portion is generated in each of the second seal portion and the third seal portion of the packing. The compression reaction force of the second seal portion seals between the second seal portion and the valve body portion. Further, the compression reaction force of the third seal portion seals between the third seal portion and the valve body portion.

Here, since the distance from the axis of the through hole to the third seal portion is longer than the distance from the axis to the first seal portion, the third seal portion is elastically deformed to the side away from the axis with the above compression. As a result, the compression reaction force escapes, and the sealing property between the third sealing portion and the valve body portion may deteriorate. However, the second seal portion is located closer to the axis than the third seal portion. Moreover, the distance from the axis to the second seal portion is shorter than the distance from the axis to the first seal portion. For this reason, with the above compression, the second seal portion is less likely to be elastically deformed toward the side away from the axis, and the compression reaction force is less likely to escape. Therefore, the sealing property between the second seal portion and the valve body portion is enhanced. Therefore, when the pressure of the fluid on the outer peripheral side of the packing is lower than that in the accommodating portion, the flow of the fluid through between the packing and the valve body to the through hole side is regulated by the second seal portion. To.

Further, the distance from the axis of the third seal portion located at a position farther than the axis of the second seal portion with respect to the axis is longer than the distance from the axis of the first seal portion. From this, the force of the fluid toward the valve body side acts on the packing. This force increases as the pressure of the fluid increases, and the sealing property between the third sealing portion and the valve body portion is enhanced. The flow of the fluid through between the packing and the valve body toward the through hole is regulated by the third seal.

In the packing, the first to third seal portions each form an annular shape, the second seal portion is formed to have a smaller diameter than the first seal portion, and the third seal portion is larger than the first seal portion. It is preferably formed with a large diameter.

When the first to third seal portions each form an annular shape, the second seal portion is formed to have a smaller diameter than the first seal portion as described above, so that the second seal portion is formed from the axis of the through hole. The distance to is shorter than the distance from the axis to the first seal portion. Further, since the third seal portion is formed to have a diameter larger than that of the first seal portion, the distance from the axis to the third seal portion becomes longer than the distance from the axis to the first seal portion.

In the packing, the surface of the packing main body on which the first seal portion protrudes, and both side portions of the first seal portion in the circumferential direction of the valve main body, receive pressure of the fluid. It is preferable that a surface is formed.

According to the above configuration, a part of the pressure of the fluid in the accommodating portion acts on the pressure receiving surface formed at the position satisfying the above conditions with respect to the packing main body portion. Therefore, it becomes easy to apply a force toward the valve body side to the packing and increase this force as the pressure of the fluid increases.

In the packing, it is preferable that the pressure receiving surface is formed over the entire surface of both side portions.
According to the above configuration, the area of the pressure receiving surface is the maximum that can be taken, and the pressure of the fluid acts efficiently on the packing through the pressure receiving surface.

According to the packing and the rotary valve, the sealing property can be improved at both low pressure and high pressure of the fluid.

The perspective view of the rotary valve in one embodiment. The perspective view of the packing in one Embodiment. An exploded perspective view of a rotary valve according to an embodiment. The cross-sectional perspective view which shows the internal structure of the rotary valve in one Embodiment. FIG. 3 is a plan sectional view of a rotary valve according to an embodiment. FIG. 5 is a partial plan sectional view showing an enlarged portion X of FIG. The vertical sectional view of the rotary valve in one embodiment. A partially enlarged cross-sectional view showing the relationship between the valve body and the packing in a conventional rotary valve.

Hereinafter, an embodiment of the packing and the rotary valve will be described with reference to FIGS. 1 to 7.
As shown in FIGS. 1 and 3, the rotary valve 10 is a valve provided in the middle of a flow path of a fluid such as water supplied from a fluid supply source such as a pump (not shown) to adjust the flow rate. .. The rotary valve 10 includes a housing 11 and a valve body 40. Next, each member will be described.

<Housing 11>
As shown in FIGS. 3 and 4, the housing 11 includes a cover 12 and a body 15. The cover 12 has a plate shape and has a bearing hole 13 in the central portion. In the present embodiment, a cover 12 having a substantially square plate shape is used, but a cover 12 having a shape other than that may be used. An annular protrusion 14 is formed around the bearing hole 13 on the surface of the cover 12 on the body 15 side.

The body 15 is a tubular portion 16 formed in a square tubular shape by four side wall portions 17, and an end portion of the tubular portion 16 on the cover 12 side, and is a square formed around the tubular portion 16. An annular flange portion 21 and a closing portion 22 formed at an end portion of the tubular portion 16 opposite to the flange portion 21 and closing the end portion are provided.

A plate-shaped sealing member 23 forming a square ring is interposed between the cover 12 and the flange portion 21. The cover 12, the seal member 23, and the flange portion 21 are connected at their four corners. In the present embodiment, this connection is made by the bolt 24 and the nut 25, but it may be made by other connecting means.

The portion of the body 15 surrounded by the tubular portion 16 and the closing portion 22 and the cover 12 constitutes the accommodating portion 26. An inflow port 27 for the fluid FL is opened in the central portion of the closed portion 22. From the peripheral edge of the inflow port 27 in the closed portion 22, the connecting pipe portion 28 projects toward the side away from the accommodating portion 26. As shown in FIG. 7, the connecting pipe portion 28 and the fluid supply source are connected by a pipe 32 having a first flow path 31 of the fluid FL.

As shown in FIGS. 5 and 7, a fluid FL outlet 18 is opened at the central portion of each side wall portion 17 of the tubular portion 16. A connecting pipe portion 19 projects from the peripheral edge portion of the outflow port 18 in each side wall portion 17 toward the side away from the accommodating portion 26. A pipe 34 having a second flow path 33 of the fluid FL is connected to each connection pipe portion 19, and the fluid FL flowing out from the outflow port 18 is sent to the destination of the fluid through the pipe 34. The second flow path 33 and the first flow path 31 form a part of the flow path.

<Valve body 40>
As shown in FIGS. 3 and 4, the valve body 40 includes a shaft portion 41 and a valve body portion 42. The shaft portion 41 has a columnar shape having a diameter slightly smaller than that of the bearing hole 13. The valve body 42 has a substantially cylindrical shape having a diameter larger than that of the shaft 41, and is connected to one end of the coaxial portion 41.

Then, the shaft portion 41 is inserted into the bearing hole 13, and the valve main body portion 42 is accommodated in the accommodating portion 26. The shaft portion 41 is rotatably supported with respect to the cover 12 in the bearing hole 13. An O-ring 43 is interposed between the shaft portion 41 and the protrusion 14 of the cover 12.

As shown in FIGS. 5 and 7, a movable flow path 44 is formed in the valve body 40 to guide the fluid FL flowing into the accommodating portion 26 from the first flow path 31 to any second flow path 33. There is. One end 44a of the movable flow path 44 is opened on the surface (lower surface of FIG. 7) of the valve body 42 opposite to the shaft 41, and faces the inflow port 27. The other end 44b of the movable flow path 44 is opened on the outer peripheral surface of the valve body 42, and the valve body 42 rotates integrally with the shaft 41 to reach any of the four outlets 18. It is possible to face each other. Further, by the above rotation, it is possible to switch the outlet 18 with which the end portion 44b faces.

The valve body 40 having the above configuration is rotated by a motor (not shown), manual operation, or the like. By this rotation, the flow path cross-sectional area between the first flow path 31 and the second flow path 33 via the movable flow path 44 is adjusted, and the amount of fluid FL flowing from the first flow path 31 to the second flow path 33. Is adjusted. This flow rate adjustment also includes blocking the flow of the fluid FL from the first flow path 31 to the second flow path 33.

A sealing packing 50 formed of an elastic material such as rubber is arranged between each side wall portion 17 of the tubular portion 16 and the outer peripheral surface of the valve body portion 42 in a compressed state. In this embodiment, four packings 50 are arranged at equal angles around the valve body 42. Each packing 50 has the same structure as each other. As shown in FIGS. 2 and 6, each packing 50 includes a packing main body 51, a first seal 53, a second seal 54, and a third seal 55. Each of the first seal portion 53 to the third seal portion 55 has an annular shape.

The packing main body 51 has a plate shape having a constant or substantially constant thickness, and is curved along the outer peripheral surface of the valve main body 42. The packing main body 51 has a through hole 52 extending in the radial direction of the valve main body 42 in the central portion. The through hole 52 is composed of a round hole and functions as a passage for the fluid FL. Then, as shown in FIG. 5, each packing 50 is assembled to the side wall portion 17 in a state where the through hole 52 is communicated with the corresponding second flow path 33.

As shown in FIGS. 2 and 6, the first seal portion 53 is a surface of the packing main body portion 51 on the side wall portion 17 side, and protrudes from the periphery of the through hole 52 toward the side wall portion 17. It is in contact with the periphery of the outlet 18 on the side wall portion 17.

The second seal portion 54 is a surface of the packing main body 51 on the valve main body 42 side, protrudes from the periphery of the through hole 52 toward the valve main body 42, and comes into contact with the outer peripheral surface of the valve main body 42. are doing. Further, the third seal portion 55 is the above-mentioned surface of the packing main body 51, projects from the outer periphery of the second seal 54 toward the valve main body 42, and comes into contact with the outer peripheral surface of the valve main body 42. are doing. The protruding direction of the first seal portion 53 from the packing main body 51 and the protruding direction of the second seal 54 and the third seal 55 from the packing main body 51 are opposite to each other.

The first seal portion 53 to the third seal portion 55 are located on the same axis as the through hole 52. Since the second seal portion 54 is formed to have a smaller diameter than the first seal portion 53, the distance from the axis L1 of the through hole 52 to the second seal portion 54 is the distance from the coaxial line L1 to the first seal portion 53. Is set shorter than. Since the third seal portion 55 is formed to have a diameter larger than that of the first seal portion 53, the distance from the axis L1 to the third seal portion 55 is set longer than the distance from the axis L1 to the first seal portion 53. Has been done.

The first seal portion 53 to the third seal portion 55 further satisfy the following conditions.
The peripheral length of the second seal portion 54 is shorter than the peripheral length of the first seal portion 53. The peripheral length of the third seal portion 55 is longer than the peripheral length of the first seal portion 53. Since the first seal portion 53 to the third seal portion 55 each have an annular shape, the peripheral length is a circumference.

When the first seal portion 53 to the third seal portion 55 are projected onto a virtual surface orthogonal to the axis L1 of the through hole 52, the second seal portion 54 is the first seal portion 53 and the third seal portion 55. The first seal portion 53 is surrounded by the third seal portion 55.

By the way, in the annular first seal portion 53, the pressure of the fluid FL acts on the outer peripheral surface. Here, as shown in FIG. 6, the minimum diameter of the portion where the pressure of the fluid FL acts on the first seal portion 53 is referred to as the diameter D1, and the second seal portion 54 comes into contact with the outer peripheral surface of the valve body portion 42. The maximum diameter of the portion is referred to as the diameter D2, and the maximum diameter of the portion where the third seal portion 55 contacts the outer peripheral surface of the valve body portion 42 is referred to as the diameter D3. As described above, since the second seal portion 54 is formed to have a smaller diameter than the first seal portion 53 and the third seal portion 55 is formed to have a larger diameter than the first seal portion 53, the diameter D1 and the diameter The relationship of D2 <D1 <D3 is established between D2 and the diameter D3.

Further, on the surface of the packing main body 51 on which the first seal 53 protrudes, both side portions of the first seal 53 in the circumferential direction of the valve main body 42 are pressure receiving surfaces 56 that receive the pressure of the fluid FL. However, it is formed over the entire surface of both sides of the same. Each pressure receiving surface 56 is curved along the outer peripheral surface of the valve body 42. Further, each pressure receiving surface 56 extends in the axial direction of the valve body 40.

Next, the operation of the present embodiment configured as described above will be described. In addition, the effects caused by the action will also be described.
As shown in FIGS. 5 and 6, in the rotary valve 10, four packings 50 are arranged so as to form an annular shape around the valve main body 42 and are assembled to the housing 11. In the rotary valve 10, each first seal portion 53 contacts the corresponding side wall portion 17 of the tubular portion 16, and each of the second seal portion 54 and the third seal portion 55 contacts the outer peripheral surface of the valve body portion 42. In this state, each packing 50 is compressed between the valve body portion 42 and the side wall portion 17. Along with this compression, a compression reaction force that pushes back the valve body portion 42 is generated in each of the second seal portion 54 and the third seal portion 55 in each packing 50. The compression reaction force of the second seal portion 54 causes the second seal portion 54 to be pressed against the outer peripheral surface of the valve body portion 42, and the compression reaction force of the third seal portion 55 causes the third seal portion 55 to come into contact with the valve body portion. It is pressure-welded to the outer peripheral surface of 42.

On the other hand, in the accommodating portion 26, a part of the pressure of the fluid FL on the outer peripheral side of each packing 50 is the outer peripheral surface of the packing main body 51, each pressure receiving surface 56, the first seal portion 53, and the second seal portion 54. And the third seal portion 55, respectively. However, the space between the packing 50 and the side wall portion 17 is sealed by the first sealing portion 53. The first seal portion 53 regulates that the fluid FL on the outer peripheral side of the packing 50 passes between the packing 50 and the side wall portion 17 and leaks to the through hole 52 side.

Further, the compression reaction force of the second seal portion 54 seals between the second seal portion 54 and the valve body portion 42. Further, the compression reaction force of the third seal portion 55 seals between the third seal portion 55 and the valve body portion 42.

However, the distance from the axis L1 of the through hole 52 to the third seal portion 55 is longer than the distance from the axis L1 to the first seal portion 53. The third seal portion 55 has a larger diameter than the first seal portion 53, and the diameter D3 is larger than the diameter D1. For this reason, with the compression, the third seal portion 55 may be elastically deformed outward in the radial direction of the packing main body portion 51 on the side away from the axis L1, and the compression reaction force may escape. In this case, the sealing property between the third sealing portion 55 and the valve main body portion 42 is lower than that in the case where the compression reaction force does not escape or is difficult to escape.

Therefore, when the pressure of the fluid FL on the outer peripheral side of the packing 50 is lower, a part of the fluid FL may flow through the gap between the valve body portion 42 and the third seal portion 55.
However, the second seal portion 54 is located closer to the axis L1 than the third seal portion 55. The second seal portion 54 is located on the inner peripheral side of the third seal portion 55. Moreover, the distance from the axis L1 to the second seal portion 54 is shorter than the distance from the axis L1 to the first seal portion 53. The second seal portion 54 has a smaller diameter than the first seal portion 53, and the diameter D2 is smaller than the diameter D1. For this reason, with the above compression, the second seal portion 54 is less likely to be elastically deformed outward in the radial direction of the packing main body portion 51 on the side away from the axis L1, and the compression reaction force is less likely to escape. The sealing property between the second sealing portion 54 and the valve main body portion 42 is enhanced.

Therefore, when the pressure of the fluid FL is low as described above, the flow of the fluid FL to the through hole 52 side through between the packing 50 and the valve body portion 42 can be regulated by the second seal portion 54. it can.

If the second seal portion 54 is not provided, that is, if only the first seal portion 53 and the third seal portion 55 are provided as the seal portions in the packing 50, the seal between the packing 50 and the valve body portion 42 is sealed. Since the property is low, it is necessary to take additional measures to compensate for the shortage and secure the sealing property. However, as a countermeasure, if an urging member such as a spring that urges the packing main body 51 toward the valve main body 42 side is added between the packing main body 51 and the side wall 17, the sealing property can be improved. On the other hand, there are new problems such as an increase in the number of parts and an increase in assembly man-hours.

In this regard, in the present embodiment, as described above, in addition to the third seal portion 55, a second seal portion 54 having a diameter smaller than that of the first seal portion 53 is provided, and the diameter D2 is set to be smaller than the diameter D1. Therefore, the sealing property between the packing 50 and the valve body 42 is improved. Therefore, it is not necessary to add an urging member such as a spring, and it is possible to suppress an increase in the number of parts and the assembly man-hours.

In the packing 50, the distance from the axis L1 of the third seal portion 55 located at a position farther than the second seal portion 54 with respect to the axis L1 is longer than the distance from the axis L1 of the first seal portion 53. In other words, the third seal portion 55 located on the outer peripheral side of the second seal portion 54 has a larger diameter than the first seal portion 53. For this reason, a force F1 due to the fluid FL acting toward the packing 50 so as to bring it closer to the valve body 42 acts on the packing 50. This force F1 increases as the pressure of the fluid FL on the outer peripheral side of the packing 50 increases. Therefore, when the pressure of the fluid FL is high, the sealing property between the third sealing portion 55 and the valve main body portion 42 can be improved.

In particular, in the present embodiment, the pressure receiving surfaces 56 are formed on both sides of the first seal portion 53 in the circumferential direction of the valve main body 42, which is the surface of the packing main body 51 on which the first seal portion 53 protrudes. Has been done. The force F1 acts on the packing main body 51 on these pressure receiving surfaces 56. Therefore, it becomes easy to apply a force F1 toward the valve body 42 side to the packing 50 and increase this force F1 as the pressure of the fluid FL increases.

Further, in the present embodiment, since the pressure receiving surface 56 is formed over the entire surface of both side portions, the area of the pressure receiving surface 56 is the maximum that can be taken. Therefore, the pressure of the fluid FL can be efficiently applied to the packing 50 through the pressure receiving surface 56.

As described above, when the pressure of the fluid FL is high, the sealing property between the third sealing portion 55 and the valve main body portion 42 can be improved, unlike when the pressure is low. Therefore, the flow of the fluid FL to the through hole 52 side through between the packing 50 and the valve body portion 42 can be regulated by the third seal portion 55.

The above embodiment can also be implemented as a modified example in which the above is modified as follows. The above embodiment and the following modifications can be implemented in combination with each other within a technically consistent range.

The valve body 42 may be formed in a spherical shape instead of a columnar shape.
The closing portion 22 may be provided at a part of the tubular portion 16 in the length direction, and may be provided at an upper portion, for example. Further, the closing portion 22 may be provided at an intermediate portion in the length direction.

The packing main body 51 may be formed in a shape different from the plate shape.
The movable flow path 44 in the valve body 42 may guide the fluid flowing from the second flow path 33 into the accommodating portion 26 to the first flow path 31, contrary to the above embodiment. ..

The first seal portion 53 to the third seal portion 55 do not necessarily have to be formed on the same axis as the through hole 52.
-Each of the first seal portion 53 to the third seal portion 55 may be formed in an annular shape different from the annular shape. For example, each of the first seal portion 53 to the third seal portion 55 may be formed in an elliptical ring, or may be formed in a polygonal ring such as a triangular ring, a square ring, or a pentagonal ring. However, in any of the above shapes, the distance from the axis L1 of the through hole 52 to the second seal portion 54 is shorter than the distance from the axis L1 to the first seal portion 53, and from the axis L1. The distance to the third seal portion 55 is set longer than the distance from the axis L1 to the first seal portion 53.

The through hole 52 in the packing main body 51 may be formed of a hole having a shape different from that of the round hole.
In FIG. 5, the number of connecting pipe portions 19 having the second flow path 33 may be changed to a number different from that of the above embodiment. In that case, the number of packings 50 is increased or decreased according to the change in the number of connecting pipes 19. The minimum number of each of the connecting pipe portion 19 and the packing 50 is "1".

In FIG. 5, the plurality of connecting pipe portions 19 do not necessarily have to be arranged around the valve main body portion 42 at equal angles. In this case, the packing 50 is arranged between the side wall portion 17 provided with each connecting pipe portion 19 and the outer peripheral surface of the valve body portion 42. Therefore, the arrangement form (angle) of the plurality of packings 50 around the valve body portion 42 corresponds to the arrangement form (angle) of the connection pipe portion 19 and the side wall portion 17.

-As the fluid, a liquid different from water may be used. Further, as the fluid, a gas may be used instead of the liquid.
In each of the second seal portion 54 and the third seal portion 55 in FIG. 6, at least the portion in contact with the valve body portion 42 may be coated with a material having a friction coefficient lower than that of the packing 50, for example, fluororesin or the like. In this way, the friction between the packing 50 and the valve body 42 is reduced, and the load required to rotate the valve body 40 can be reduced.

-The rotary valve of the present invention is widely applicable as long as it adjusts the flow rate of the fluid by rotating the valve body.

10 ... rotary valve, 11 ... housing, 16 ... tubular part, 26 ... accommodating part, 31 ... first flow path (part of the flow path), 33 ... second flow path (part of the flow path) ), 40 ... valve body, 42 ... valve body, 44 ... movable flow path, 50 ... packing, 51 ... packing body, 52 ... through hole, 53 ... first seal, 54 ... second seal, 55 ... Third seal, 56 ... pressure receiving surface, FL ... fluid, L1 ... axis.

Claims (5)

It has a tubular portion provided with an accommodating portion, and has a housing arranged in the middle of the fluid flow path and a valve body portion in which a movable flow path for adjusting the flow path cross-sectional area of the flow path is formed. A packing applied to a rotary valve having a valve body having a valve body rotatably arranged in the housing.
A packing main body portion having a through hole extending in the radial direction of the valve main body portion and being arranged between the valve main body portion and the tubular portion in a state where the through hole is communicated with the flow path.
A first seal portion that protrudes from the periphery of the through hole in the packing main body portion and comes into contact with the tubular portion, and a first seal portion.
A second seal portion and a third seal portion that protrude from the periphery of the through hole in the packing main body portion and come into contact with the valve main body portion, respectively, are provided, and the first to third seal portions each form an annular shape. The distance from the axis of the through hole to the second seal portion is shorter than the distance from the axis to the first seal portion, and the distance from the axis to the third seal portion is from the axis to the first seal portion. Packing that is set longer than the distance to the seal. The first to third seal portions each form an annular shape, the second seal portion is formed to have a smaller diameter than the first seal portion, and the third seal portion is formed to have a larger diameter than the first seal portion. The packing according to claim 1. A pressure receiving surface for receiving the pressure of the fluid is formed on both side portions of the packing main body portion on the side where the first seal portion protrudes and in the circumferential direction of the valve main body portion. The packing according to claim 1 or 2. The packing according to claim 3, wherein the pressure receiving surface is formed over the entire surface of both side portions. It has a tubular portion provided with an accommodating portion, and has a housing arranged in the middle of the fluid flow path and a valve body portion in which a movable flow path for adjusting the flow path cross-sectional area of the flow path is formed. The skeleton portion is composed of a valve body in which the valve main body is rotatably arranged in the accommodating portion and a packing main body having a through hole extending in the radial direction of the valve main body, and the packing main body is formed. Is a rotary valve including a packing arranged between the valve main body portion and the tubular portion in a state where the through hole is communicated with the flow path.
A first seal portion that contacts the tubular portion protrudes from the periphery of the through hole in the packing main body portion, and a second seal portion that contacts the valve main body portion from the periphery of the through hole in the packing main body portion. The seal portion and the third seal portion are projected, and the first to third seal portions each form an annular shape, and the distance from the axis of the through hole to the second seal portion is the distance from the axis to the first seal portion. A rotary valve that is shorter than the distance to and the distance from the axis to the third seal portion is set to be longer than the distance from the axis to the first seal portion.

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