KR20140043873A - Seal structure of rotational shaft and valve device having the same - Google Patents

Abstract

Provided is a seal structure of a rotation shaft capable of preventing the surface pressure of a seal member from decreasing and a valve device including the seal structure. A flow adjustment valve (1) includes: a valve body (10); a cylinder-shaped or cylindrical rotation shaft (3) which passes through the valve body (10) and is rotatably installed around the shaft center; a ring-shaped seal member (4) which is inserted into the rotation shaft (30), and is arranged to be between the valve body (10) and the rotation shaft (30) in a radial direction; an upper wall portion (10a) which is provided to the valve body (10) to prevent the seal member (40) from upward; and a pressuring member (50) which presses the seal member (40) upward and against the upper wall portion (10a).

Description

SEAL STRUCTURE OF ROTATIONAL SHAFT AND VALVE DEVICE HAVING THE SAME}

The present invention relates to a seal structure of a rotating shaft and a valve device having the same.

Conventionally, there exist some which were disclosed by patent document 1 as a valve apparatus which has the seal structure of a rotating shaft, for example. As shown in FIG. 8, the flow rate regulating valve 801 as the valve device described in Patent Document 1 has a cylindrical shape rotatably provided in the valve body 810 as a case and the valve chamber 814 of the valve body 810. Valve body 820 and a rotating shaft 825 protruding from the ceiling portion 823 of the valve body 820.

The rotating shaft 825 penetrates the ceiling 835 of the valve body 810 and is rotatably supported by a bearing hole 836 provided in the valve body 810. In addition, O-rings 829 and 829 as seal members are fitted into mounting grooves provided in the rotation shaft 825.

According to the flow regulating valve 801, the O-rings 829 and 829 seal between the valve body 810 and the rotation shaft 825, and the fluid from the valve chamber 814 to the valve body 810 outside. Was suppressing leakage.

Patent Document 1: Japanese Patent Laid-Open No. 2009-228764

However, the O-ring 829 is made of a relatively soft elastic material such as nitrile rubber, for example, and is elastically deformed by being sandwiched between the valve body 810 and the rotation shaft 825 in the radial direction, and thus the O-ring ( The outer surface of the 829 is pressed by the valve body 810 and the rotating shaft 825 at a predetermined surface pressure to seal them, for example, to harden, shrink or creep the O-ring 829 due to low temperature or time. The elastic force may not be maintained due to deformation caused by this, and this causes a problem that the surface pressure of the O-ring 829 is lowered and the sealing effect is lowered.

Then, an object of this invention is to solve the said subject. That is, an object of this invention is to provide the sealing structure of the rotating shaft which can suppress the fall of the surface pressure of a sealing member, and the valve apparatus which has it.

In order to achieve the above object, the invention according to claim 1 includes a case, a cylindrical or cylindrical rotating shaft penetrating the case and rotatably around an axis, and the rotating shaft is inserted inward, An annular seal member disposed between the case and the rotation shaft, a seal member support provided on the case or the rotation shaft to regulate movement of the seal member in one direction parallel to the axis center, and the seal member It has a pressing member which presses against the said seal member support part toward one direction, The seal structure of the rotating shaft characterized by the above-mentioned.

In order to achieve the above object, the invention according to claim 2 includes a case, a cylindrical or cylindrical rotating shaft penetrating the case, rotatably around the shaft center, and movable in the axial direction, and the rotating shaft is inward. An annular first seal member disposed between the case and the rotary shaft in the radial direction, a flange-shaped first seal member support portion provided on the rotary shaft, and the rotary shaft inserted therein, An annular second seal member sandwiched between the case and the rotational shaft in a direction and arranged side by side in the axial direction with the first seal member supporting portion between the first seal member and the second seal member; The second seal member is regulated in a direction parallel to the shaft center of the second seal member and between the first seal member bearing portion. Pressing the second seal member support portion provided in the case facing the first seal member support portion in the axial direction and the first seal member pressing portion to the first seal member support portion in the one direction so as to be fitted. It is a seal structure of a rotating shaft characterized by having a member.

Invention of Claim 3 is invention of Claim 2 WHEREIN: The said case is comprised from the 1st inner peripheral surface which fits the said 1st sealing member between the said rotating shaft, and the said 2nd sealing member support part of the said 1st inner peripheral surface. A second inner circumferential surface that is continuous on the far side is provided, and the first inner circumferential surface is formed to have a uniform inner diameter over the axial center direction, and the second inner circumferential surface faces another direction opposite to the one direction. Is formed to gradually increase in inner diameter, and the first seal member moves away from the first inner circumferential surface and faces the second inner circumferential surface at intervals when the rotating shaft moves in the other direction in the liquid encapsulation state. The first inner circumferential surface and the second inner circumferential surface are provided.

In order to achieve the above object, the invention according to claim 4 is provided with a valve body provided with a valve chamber, a valve body rotatably housed in the valve chamber, attached to the valve body, and penetrates the valve body and moves around the shaft center. A valve device having a cylindrical or cylindrical rotating shaft provided to be rotatable, the valve device having a seal structure of any one of claims 1 to 3 as a seal structure of the rotating shaft.

According to the invention described in claim 1, an annular seal member disposed between the case and the rotary shaft in the radial direction, and a seal member provided on the case or the rotary shaft so as to restrict movement in one direction parallel to the axis center of the rotary shaft of the seal member. And a pressing member for pressing the sealing member and the sealing member supporting portion toward the one direction. For this reason, as a press member presses a seal member toward a said seal member support part toward the said one direction, the force which a seal member compresses in the said one direction, ie, the axial direction of a rotating shaft, and expands in a radial direction becomes strong. As a result, even when a low temperature or hardening of the seal member due to lapse of time, deformation due to shrinkage or creep, or the like occurs, a decrease in the surface pressure on the case and the rotating shaft of the seal member can be suppressed.

According to the invention as set forth in claim 2, there is provided a case, a cylindrical or cylindrical rotary shaft penetrating the case and rotatably and axially moved around the shaft center, and a circle disposed between the case and the rotary shaft in the radial direction. The first seal member and the rotating shaft of the annular seal member, the flange-shaped first seal member support portion provided on the rotating shaft, and between the case and the rotation shaft in the radial direction and between the first seal member support portion A second seal member is regulated between the annular second seal member arranged side by side in the axial direction and in a direction parallel to the axis center of the axis of rotation of the second seal member, and between the first seal member support portion. The second seal member support portion and the first seal member provided in the case so as to face each other in the axial direction of the rotational shaft with the first seal member support portion and the first seal member face one direction. The pressing member is pressed against the first seal member support. For this reason, when a press member presses a 1st sealing member to a 1st sealing member support part toward the said one direction, a 1st sealing member presses a 1st sealing member support part, and a said 1st sealing member support part is said work with a rotating shaft. Move toward the direction. By this movement, the first seal member support portion presses the second seal member toward the second seal member support portion toward the one direction so that the first seal member and the second seal member are in the one direction, that is, in the axial direction of the rotation axis. Is compressed to increase the radial expansion force. As a result, even when a low temperature or hardening of the seal member due to lapse of time, deformation due to shrinkage or creep, or the like occurs, a decrease in the surface pressure of the first seal member and the second seal member against the case and the rotating shaft can be suppressed. .

In addition, in the above-mentioned flow rate adjustment valve 801, since the O-ring 829 is fitted in the mounting groove provided in the rotating shaft 825, the O-ring 829, the valve main body 810, and the rotating shaft 825 In a liquid encapsulation state in which liquid has infiltrated the micro-gap space between the gas and the liquid, the high pressure is applied to the valve body 810 or the rotating shaft 825 when the liquid invades the gap-space due to temperature change. Although there was a possibility that a large load would be applied and destroyed, according to the invention of claim 2, since the rotating shaft is provided to be movable in the axial center direction, the first seal member bearing portion provided on the rotating shaft is also movable in the axial center direction, and thus the second seal. In the liquid encapsulation state in which liquid has infiltrated into the minute gap space between the member and the first seal member support portion, the second seal member support portion, the case and the rotating shaft, which are arranged to surround the member, the gap hole is changed by temperature change. One, even if the liquid enters the expansion, it is possible to release a first seal member pressure receiving portion to move to the axial direction from the clearance space to the outside. For this reason, the load on a 2nd sealing member, a case, a rotating shaft, etc. can be reduced.

According to invention of Claim 3, the case is provided with the 1st inner peripheral surface which clamps a 1st sealing member between rotating shafts, and the 2nd inner peripheral surface which is continuous in the side which is far from the 2nd sealing member base part of a 1st inner peripheral surface. The first inner circumferential surface is formed to have a uniform inner diameter over the axial center direction of the rotating shaft, and the second inner circumferential surface is formed so as to gradually increase the inner diameter as it faces the other direction opposite to the one direction, and the rotating shaft is filled with liquid. The first inner circumferential surface and the second inner circumferential surface are provided so that the first seal member moves away from the first inner circumferential surface and faces the second inner circumferential surface at intervals when moving in the other direction. For this reason, for example, when a liquid encapsulation state occurs between the first seal member and the second seal member, even when the liquid infiltrating into the gap space due to temperature change expands, the rotation axis moves in the other direction. The first seal member moves away from the first inner circumferential surface and moves to a position opposing the second inner circumferential surface at intervals with the movement of the rotational shaft, and the pressure is transmitted through the gap (gap) between the first seal member and the second inner circumferential surface. Can be freely released. For this reason, the load on a 2nd sealing member, a case, a rotating shaft, etc. can be further reduced.

According to invention of Claim 4, since it has the seal structure of the rotating shaft as described in any one of Claims 1-3, when the hardening of a sealing member, shrinkage, or a deformation | transformation by a creep phenomenon generate | occur | produce in low temperature or time, etc. In addition, the fall of the surface pressure with respect to the case and the rotating shaft of a sealing member can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a longitudinal cross-sectional view of the flow regulating valve of 1st Embodiment of this invention.
It is a longitudinal cross-sectional view of the flow regulating valve of 2nd Embodiment of this invention.
FIG. 3A is an enlarged cross-sectional view showing a normal state of the flow regulating valve of FIG. 2, and FIG. 3B shows that the rotating shaft is moved due to the pressure rise during liquid filling of the flow regulating valve of FIG. 2. It is an expanded sectional view which shows a state.
4 is an enlarged cross-sectional view illustrating a configuration of a first modification of the flow regulating valve of FIG. 2.
FIG. 5 is an enlarged cross-sectional view illustrating a configuration of a second modification of the flow regulating valve of FIG. 2.
FIG. 6 is an enlarged cross sectional view showing a configuration of a third modification of the flow regulating valve of FIG. 2, (a) is an enlarged cross sectional view showing a normal state, and (b) is a pressure increase during liquid filling. It is an expanded sectional view which shows the state which the rotation axis moved.
7 is an enlarged sectional view showing a configuration of a fourth modified example of the flow regulating valve of FIG. 2, (a) is an enlarged sectional view showing a normal state, and (b) is a pressure increase during liquid filling. It is an expanded sectional view which shows the state which the rotation axis moved.
8 is a longitudinal sectional view of a conventional flow control valve.

(First embodiment)

EMBODIMENT OF THE INVENTION Below, the flow regulating valve of 1st Embodiment of this invention is demonstrated with reference to FIG.

1: is a longitudinal cross-sectional view of the flow regulating valve as a valve apparatus of 1st Embodiment of this invention. The concept of "up and down" in the following description corresponds to the up and down in FIG. 1 and shows the relative positional relationship of each member, and does not represent absolute positional relationship.

As shown in FIG. 1, the flow regulating valve (shown with the code | symbol 1 in the figure) of this embodiment is the valve main body 10 as a case, the valve body 20, the rotating shaft 30, and the sealing member. 40 and the pressing member 50 are provided.

The valve body 10 is coupled to the first body portion 11 and the second body portion 12 by bolts (not shown), and a valve chamber 13 is provided inside the valve body 10.

The valve chamber 13 is provided with the valve body accommodating part 13a and the rotating shaft accommodating part 13b which mutually communicated. The valve body accommodating part 13a is a substantially cuboid space in which the substantially spherical valve body 20 mentioned later is accommodated. The rotary shaft receiving portion 13b is a substantially cylindrical space extending from the valve body receiving portion 13a toward the upper side of the drawing. A line P extending in the vertical direction in FIG. 1 is a straight line overlapping the axis of the rotation shaft accommodation portion 13b.

The rotating shaft accommodating part 13b in the valve main body 10 is partitioned off by the 1st inner peripheral surface 13c, the 2nd inner peripheral surface 13d, and the 3rd inner peripheral surface 13e.

The 1st inner peripheral surface 13c has divided the upper part in the figure of the rotation accommodating part 13b. The 1st inner peripheral surface 13c is formed uniformly larger than the outer diameter of the rotating shaft main body 31 of the rotating shaft 30 mentioned later, and in the axial direction (P line direction) of the rotating shaft 30. As shown in FIG. The second inner circumferential surface 13d is continuous to the lower side in the drawing of the first inner circumferential surface 13c and partitions the central portion in the drawing of the rotation shaft accommodation portion 13b. The second inner circumferential surface 13d is formed so as to gradually increase as the inner diameter thereof faces downward in the drawing. The 3rd inner peripheral surface 13e is continuous in the lower side in the figure of the 2nd inner peripheral surface 13d, and partitions the lower part in the figure of the rotating shaft accommodation part 13b. As for the 3rd inner peripheral surface 13e, the internal diameter is formed uniformly over the axial direction of the rotating shaft 30. As shown in FIG.

Moreover, the through-hole formed in the upper wall part 10a of the upper side in the figure of the rotating shaft accommodation part 13b of the valve main body 10 about the same diameter as the outer diameter of the rotating shaft main body 31 of the rotating shaft 30 mentioned later. (14) is provided. The through-hole 14 is arrange | positioned so that a P line may pass through the center. Some clearance is provided between the peripheral surface of the through-hole 14 and the outer peripheral surface of the rotating shaft 30, and this upper wall part 10a functions as a bearing part of the rotating shaft 30 mentioned later. Moreover, this upper wall part 10a also functions as a seal member support part which contacts the sealing member 40 mentioned later and regulates the movement of the sealing member 40 to the upward direction.

Moreover, the valve main body 10 is provided with the primary side opening 15 which communicates with the valve body accommodating part 13a of the valve chamber 13 in the 1st main body part 11 side, and the 2nd main body part 12 is provided. The secondary side opening 16 which communicates with the valve body accommodating part 13a of the valve chamber 13 is provided in the valve side 13 side. The primary side opening 15 and the secondary side opening 16 are disposed to face each other with the valve body accommodating portion 13a of the valve chamber 13 interposed therebetween. In the valve body accommodating part 13a of the valve chamber 13, the valve seat rings 17 and 17 which support the valve body 20 rotatably are accommodated.

The valve body 20 is formed in substantially spherical shape, and the flow passage hole 21 which penetrates the center is provided. The valve body 20 is accommodated in the valve body accommodating part 13a of the valve chamber 13, and is extended by the valve seat rings 17 and 17 through the center of the line P in the up-down direction in the figure. It is rotatably supported around.

The rotating shaft 30 has the rotating shaft main body 31 formed in the cylinder form or cylindrical shape. The rotary shaft main body 31 penetrates through the through-hole 14 provided in the upper wall part 10a of the valve main body 10. As shown in FIG. Thereby, the rotating shaft main body 31 penetrates the valve main body 10, and is rotatably supported around an axial center. The rotary shaft main body 31 is arrange | positioned so that the shaft center may overlap with the line P. FIG.

In the figure of the rotating shaft main body 31, the one end part of the lower side is fitted and fixed to the fitting hole 22 of the valve body 20. As shown in FIG. In the figure of the rotating shaft main body 31, the other end part of the upper side is attached to the electric actuator provided with the speed reducer, such as a planetary gear mechanism which is located outside of the valve main body 10, and is not shown in figure. When the rotating shaft main body 31 is rotated around the line P (that is, the shaft center) by this electric actuator, the valve body 20 is rotated around the line P by this. The flow rate control valve 1 communicates with the flow opening hole 21 of the valve body 20 between the primary side opening 15 and the secondary side opening 16 in accordance with the rotational position of the valve body 20. Valve opened state and a valve half state in which a state between the primary side opening 15 and the secondary side opening 16 is closed by the valve body 20 or between the valve open state and the valve closed state. It is in a state.

The seal member 40 is comprised from relatively soft elastic materials, such as a nitrile rubber and a silicone rubber, for example. The seal member 40 is formed so as to be annular (ring-shaped) in a state where no force is applied from the outside (the state that is not elastically deformed), and the inner diameter thereof is slightly smaller than the outer diameter of the rotating shaft main body 31 of the rotating shaft 30. It is small and the outer diameter is the position near the upper wall part 10a of the valve body 10 of the rotating shaft accommodation part 13b of the valve chamber 13, ie, the sealing member 40 [first inner peripheral surface ( 13c)] is slightly larger than the inner diameter.

The seal member 40 is inserted into the rotary shaft 30 (specifically, the rotary shaft main body 31) and disposed in the rotary shaft accommodation portion 13b of the valve chamber 13, thereby providing the It is inserted in the radial direction between the 1st inner peripheral surface 13c which partitions the rotating shaft accommodating part 13b of the valve chamber 13, and the rotating shaft 30, and seals between the valve main body 10 and the rotating shaft 30. As shown in FIG.

The pressing member 50 has a collar 51 and a compression coil spring 52.

The color 51 is formed in an annular shape, for example, using a relatively hard synthetic resin or the like, and its inner diameter is slightly larger than the outer diameter of the rotating shaft body 31 of the rotating shaft 30, and the outer diameter thereof is a valve chamber ( It is slightly smaller than the inner diameter of the upper wall part 10a vicinity of the valve main body 10 of the rotating shaft accommodation part 13b of 13). In the collar 51, the rotating shaft 30 (specifically, the rotating shaft main body 31) is inserted through the inner side and disposed adjacent to the valve body 20 side of the seal member 40.

The inner diameter of the compression coil spring 52 is larger than the outer diameter of the rotating shaft main body 31 of the rotating shaft 30, and the outer diameter is smaller than the inner diameter of the rotating shaft accommodating part 13b of the valve chamber 13. As for the compression coil spring 52, the rotating shaft 30 (specifically, the rotating shaft main body 31) is penetrated inward, and the shaft center is arrange | positioned on the line P superimposed. In addition, the compression coil spring 52 has one end in contact with the collar 51 and the other end in contact with the valve body 20, and is compressed in the line P direction between the collar 51 and the valve body 20. It is arranged in a state.

Next, the effect | action of the flow regulating valve 1 of this embodiment is demonstrated.

As for the flow regulating valve 1, the sealing member 40 is provided between the valve main body 10 and the rotating shaft 30. As shown in FIG. The seal member 40 is located between the valve body 10 and the rotation shaft 30 in the radial direction, whereby the seal member 40 is radially moved by the valve body 10 and the rotation shaft 30. Elastically deformed to be compressed, the outer surface of the seal member 40 is formed on the first inner circumferential surface 13c and the outer circumferential surface of the rotating shaft 30 that define the rotating shaft receiving portion 13b of the valve chamber 13 of the valve body 10. It is pressed and seals between the valve body 10 and the rotating shaft 30. As shown in FIG.

In addition, the sealing member 40 is restricted to move upward by the upper wall portion 10a, and is upwardly moved by the color 51 and the compression coil spring 52 of the pressing member 50. It is pressed against the wall part 10a. Thereby, the sealing member 40 is compressed in the line P direction, and the force which expands in a radial direction becomes strong.

As described above, the flow regulating valve 1 of the present embodiment passes through the valve body 10 and the valve body 10, and has a cylindrical or cylindrical rotating shaft 30 rotatably installed around the shaft center. And the annular seal member 40 and the seal member 40 arranged in such a manner that the rotary shaft 30 is inserted in between the valve body 10 and the rotary shaft 30 in the radial direction. The upper wall part 10a provided in the valve main body 10 and the press member 50 which presses the seal member 40 against the upper wall part 10a toward an upward direction so that the movement of the valve body 10 may be regulated are provided.

According to the present embodiment, the valve is configured to restrict the upward movement of the seal member 40 and the annular seal member 40 disposed so as to be between the valve body 10 and the rotation shaft 30 in the radial direction. The upper wall part 10a provided in the main body 10 and the press member 50 which presses the seal member 40 to the upper wall part 10a toward an upward direction are provided. For this reason, as the press member 50 presses the seal member 40 to the upper wall part 10a toward the upward direction, the seal member 40 is compressed in an upward direction, ie, in the axial direction of the rotation shaft 30. And the force expanding in the radial direction becomes strong. As a result, even when a low temperature or a hardening, shrinkage or creep of the seal member 40 occurs due to elapse of time, the surface pressure of the seal member 40 with respect to the valve body 10 and the rotating shaft 30 may be reduced. The fall can be suppressed.

(Second Embodiment)

EMBODIMENT OF THE INVENTION Below, the flow regulating valve as a valve apparatus of 2nd Embodiment of this invention is demonstrated with reference to FIG. 2 and FIG.

It is a longitudinal cross-sectional view of the flow regulating valve of 2nd Embodiment of this invention. FIG. 3A is an enlarged cross-sectional view showing a normal state of the flow regulating valve of FIG. 2, and FIG. 3B shows that the rotating shaft is moved due to the pressure rise during liquid filling of the flow regulating valve of FIG. 2. It is an expanded sectional view which shows a state. In addition, the concept of "up-down" in the following description corresponds to the up-down in FIG. 2 and FIG. 3, and shows the relative positional relationship of each member, and does not show absolute positional relationship.

As shown in FIG. 2, the flow regulating valve (1A in drawing) of this embodiment has the valve main body 10 as a case, the valve body 20, 30A of rotation shafts, and the 1st The seal member 41, the second seal member 42, and the pressing member 50 are included. In this embodiment, the same code | symbol is attached | subjected to the structural member similar to 1st Embodiment mentioned above, and description is abbreviate | omitted.

30 A of rotary shafts are provided in the center of the rotating shaft main body 31 formed in the columnar shape or the cylinder, and the axial center direction, and the outer diameter is the 1st inner peripheral surface 13c of the rotating shaft accommodating part 13b of the valve chamber 13. It has integrally the flange portion 32 which is approximately equal to the inner diameter of. The rotary shaft main body 31 penetrates through the through-hole 14 provided in the upper wall part 10a of the valve main body 10. As shown in FIG. Thereby, the rotating shaft main body 31 penetrates the valve main body 10, and is rotatably supported around an axial center. The rotary shaft main body 31 is arrange | positioned so that the shaft center may overlap with the line P. FIG. In this state, the flange part 32 is arrange | positioned facing the upper wall part 10a of the valve main body 10 in the line P direction.

In the figure of the rotating shaft main body 31, the one end part of the lower side is fitted to the fitting hole 22 provided in the valve body 20 with a slight allowance in the line P direction. For example, in the figure of the rotating shaft main body 31, the lower end part is formed in the key shape (key shape) which has the projection part (not shown) protruding radially in a part of the outer peripheral surface, and the fitting hole 22 is The shape seen in plan view is formed in a key groove shape (keyhole shape) coinciding with the key shape. As a result, the valve body 20 and the rotation shaft 30A are slidable in the vertical direction mutually, and are integrally rotatable in the rotational direction around the line P. That is, the rotation shaft 30A is provided to be movable in the line P direction. In the present embodiment, even when the rotation shaft 30A moves in the line P direction, the valve body 10 and the rotation shaft 30 are radially moved by the first seal member 41 moving together with the rotation shaft 30A. In order to maintain the state in between (i.e., exert a sealing function), the movable amount of the rotation shaft 30A in the line P direction, or the first inner circumferential surface 13c and the second inner circumferential surface 13d of the valve body 10, may be used. The shape and the like are set. In the figure of the rotating shaft main body 31, the other end part of the upper side is attached to the electric actuator provided with the speed reducer, such as a planetary gear mechanism which is located outside of the valve main body 10, and is not shown in figure. When the rotating shaft main body 31 is rotated around the line P by this electric actuator, the valve body 20 rotates around the line P by this. 1 A of flow regulating valves communicate with the flow opening hole 21 of the valve body 20 between the primary side opening 15 and the secondary side opening 16 according to the rotational position of the valve body 20. Valve half in a closed valve opening state, a valve closing state in which the gap between the primary side opening 15 and the secondary side opening 16 is blocked by the valve body 20, or a state between the valve opening state and the valve closing state. It becomes an open state.

The first seal member 41 is made of a relatively soft elastic material such as nitrile rubber or silicone rubber, for example. The first seal member 41 is formed so as to be annular (ring-shaped) in a state where no force is applied from the outside (a state that is not elastically deformed), and an inner diameter of the rotating shaft main body 31 of the rotating shaft 30A is provided. It is slightly smaller than the outer diameter, and the outer diameter is the position near the center of the up-down direction of the valve body 10 of the rotating shaft accommodation part 13b of the valve chamber 13, ie, the 1st sealing member 41 is positioned [made 1 inner circumferential surface 13c] is slightly larger than the inner diameter.

The first seal member 41 is inserted in the rotation shaft 30A (specifically, the rotation shaft main body 31) inward and disposed in the rotation shaft accommodation portion 13b of the valve chamber 13, thereby providing a valve in the radial direction. It is interposed between the 1st inner peripheral surface 13c which partitions the rotating shaft accommodation part 13b of the valve chamber 13 of the main body 10, and the outer peripheral surface of the rotating shaft 30A, and seals between the valve main body 10 and the rotating shaft 30A. do.

The second seal member 42 is made of a relatively hard synthetic resin such as fluororesin such as polytetrafluoroethylene (PTFE). The second seal member 42 is formed in an annular (ring) shape, and its inner diameter is substantially the same as the outer diameter of the rotating shaft main body 31 of the rotating shaft 30A, and the outer diameter thereof is the rotating shaft of the valve chamber 13. It is approximately equal to the inner diameter of the upper wall part 10a of the valve main body 10 of the accommodating part 13b, ie, the location (first inner peripheral surface 13c) where the 2nd sealing member 42 is positioned. Similar to the first seal member 41, the second seal member 42 may be made of a relatively soft elastic material, in which case the inner diameter thereof is slightly smaller than the outer diameter of the rotation shaft body 31 of the rotation shaft 30A. It is preferable that the outer diameter is slightly larger than the first inner circumferential surface 13c of the valve chamber 13.

As for the 2nd sealing member 42, 30 A of rotation shafts (specifically, the rotation shaft main body 31) are inserted in the inside, and are arrange | positioned at the rotation shaft accommodating part 13b of the valve chamber 13, and a valve in a radial direction is carried out. It is sandwiched between the first inner circumferential surface 13c of the main body 10 and the outer circumferential surface of the rotary shaft 30A to seal between the valve main body 10 and the rotary shaft 30A.

The first seal member 41 is disposed on the valve body 20 side of the flange portion 32 of the rotation shaft 30A. The second seal member 42 is disposed on the upper wall portion 10a side of the flange portion 32 of the rotation shaft 30A. That is, the 1st sealing member 41 and the 2nd sealing member 42 are arrange | positioned side by side in the line P direction with the flange part 32 interposed.

As for the color 51 of the pressing member 50, the rotating shaft 30A (specifically, the rotating shaft main body 31) is penetrated inward and adjoined to the valve body 20 side of the 1st sealing member 41. FIG. Are arranged. The compression coil spring 52 of the pressing member 50 has one end in contact with the collar 51 and the other end in contact with the valve body 20, and the line P direction between the collar 51 and the valve body 20. It is arranged in a compressed state.

Next, the operation of the flow regulating valve 1A of the present embodiment will be described.

The 1st sealing member 41 is provided between the valve main body 10 and the rotating shaft 30A of 1 A of flow regulating valves. The first seal member 41 is sandwiched between the valve body 10 and the rotation shaft 30A in the radial direction, whereby the first seal member 41 has the valve body 10 and the rotation shaft 30A. Elastically deformed so as to be compressed in the radial direction, so that the outer surface of the first seal member 41 partitions the rotary shaft receiving portion 13b of the valve chamber 13 of the valve body 10, and It is pressed by the outer peripheral surface of 30 A of rotation shafts, and seals between the valve body 10 and 30 A of rotation shafts. In addition, the second seal member 42 is also sandwiched between the valve body 10 and the rotation shaft 30A in the radial direction to seal between the valve body 10 and the rotation shaft 30A.

Moreover, 1 A of flow volume adjusting valves are the press member 50, the 1st sealing member 41, the flange part 32 of the rotating shaft 30A, and the 2nd in order from the valve body 20 side to an upward direction. The seal member 42 and the upper wall portion 10a of the valve body 10 are arranged side by side. The rotation shaft 30A is movable in the vertical direction. For this reason, the 1st sealing member 41 is pressed upward by the press member 50, and is pressed by the flange part 32 of 30 A of rotation shafts, and is pressed against the flange part 32 of this rotation shaft 30A. As a result, the second sealing member 42 is pressed upward and pressed to the upper wall portion 10a. As a result, the upward movement of the first seal member 41 is regulated by the flange portion 32 of the rotation shaft 30A, and the force that is compressed in the line P direction and expands in the radial direction is strong. In addition, in this embodiment, although the 2nd sealing member 42 is a comparatively hard synthetic resin, when the 2nd sealing member 42 is comprised from a comparatively soft elastic material, it is upward by the upper wall part 10a. The movement of is regulated, causing a force to be compressed in the line P direction and expand in the radial direction.

Moreover, in 1 A of flow volume adjusting valves, the 2nd sealing member 42 is a flange part 32 of the rotation shaft 30A, the upper wall part 10a of the valve main body 10, and the valve chamber of the valve main body 10. It is accommodated in the part which partitions the rotating shaft accommodation part 13b of (13), and the space enclosed by the rotating body main body 31 of the rotating shaft 30A. For this reason, in the normal state shown to Fig.3 (a), it may be in the liquid encapsulation state in which the liquid penetrated into the micro clearance space S between the 2nd sealing member 42 and the member which surrounds it. . When the liquid penetrating into the gap space S expands due to a temperature change or the like and the pressure of the liquid rises, the pressure passes through the flange portion 32 and the first seal member 41 of the rotation shaft 30A. The pressing member 50 is conveyed to the pressing member 50 to compress it, and as shown in FIG. 3B, the first sealing member 41, the flange part 32, and the second sealing member 42 are In the figure, it moves downward and the clearance gap S 'is created between the upper wall part 10a and the 2nd sealing member 42, and for this reason, the liquid in the clearance gap S' has the upper wall part 10a. ) And the clearance between the rotational shaft 30A (the clearance between the peripheral surface of the through hole 14 and the outer circumferential surface of the rotational shaft 30A) are released to the outside of the flow regulating valve 1A. That is, in the liquid encapsulation state, the pressure generated by the expansion of the liquid is released to the outside.

As described above, the flow regulating valve 1A of the present embodiment passes through the valve body 10 and the valve body 10, and has a cylindrical or cylindrical rotating shaft 30A rotatably installed around the shaft center. And the annular first seal member 41 and the planar shaft 30A, which are inserted so as to be inserted between the valve body 10 and the rotary shaft 30A in the radial direction, and the rotary shaft 30A is inserted inward. The branch part 32 and the rotation shaft 30A are inserted inward, and are inserted between the valve body 10 and the rotation shaft 30A in the radial direction, and the flange 32 of the rotation shaft 30A is interposed therebetween. 1st annular 2nd seal member 42 arrange | positioned side by side in the axial direction of the rotational axis of the seal member 41, and the 2nd seal member 42 is regulated to move upward, and plan of the rotation shaft 30A is carried out. Opposite in the axial direction of the flange portion 32 and the rotating shaft 30A so as to sandwich the second seal member 42 between the branches 32. And the top wall (10a) provided on the bracket main body 10, has a first seal (41) a pressure member 50 presses the flange portion 32 of the rotation shaft (30A) toward the upper direction.

According to this embodiment, the annular 1st sealing member 41 arrange | positioned so that it may be between the valve main body 10 and the rotating shaft 30A in the radial direction, the flange part 32 provided in the rotating shaft 30A, It is sandwiched between the valve body 10 and the rotation shaft 30A in the radial direction, and is arranged side by side in the axial direction of the first seal member 41 and the rotation shaft 30A with the flange portion 32 of the rotation shaft 30A therebetween. The second seal member 42 is disposed between the arranged annular second sealing member 42 and the upward movement of the second sealing member 42 and the flange portion 32 of the rotation shaft 30A. ), The upper wall portion 10a provided in the valve body 10 and the first seal member 41 are opposed to each other in the axial direction of the flange portion 32 of the rotating shaft 30A and the rotating shaft 30A. It has a pressing member 50 which presses against the flange part 32 of 30 A of rotation shafts toward. For this reason, when the press member 50 presses the 1st sealing member 41 to the flange part 32 of the rotation shaft 30A toward an upward direction, the 1st sealing member 41 is a flange part of the rotation shaft 30A. (32) is pressed and this flange part 32 moves upward with a rotating shaft. By this movement, the flange portion 32 of the rotation shaft 30A presses the second seal member 42 on the upper wall portion 10a of the valve body 10 in the upward direction, and thus the first seal member 41. And a force in which the second seal member 42 is compressed in the upward direction, that is, in the axial direction of the rotation axis, and expands in the radial direction. As a result, even in the case where a low temperature or hardening of the seal member due to lapse of time, deformation due to shrinkage or creep, or the like occurs, a decrease in the surface pressure of the seal member against the valve body 10 and the rotation shaft 30A can be suppressed. .

In addition, since the rotation shaft 30A is provided to be movable in the axial center direction, the flange portion 32 provided on the rotation shaft 30A is also movable in the axial center direction, so that the second seal member 42 is disposed to surround it. The part which partitions the flange part 32 of the rotating shaft 30A, the upper wall part 10a of the valve main body 10, the rotating shaft accommodating part 13b of the valve chamber 13 of the valve main body 10, and the rotating shaft 30A In the liquid encapsulation state in which liquid penetrates into the minute gap space S between the rotating body main bodies 31 of the rotating body 30, even when the liquid penetrating into the gap space due to temperature change expands, The flange portion 32 moves in the axial direction, and the pressure generated by the expansion of the liquid can be released to the outside from the gap (clearance) between the upper wall portion 10a and the rotation shaft 30A. For this reason, the load applied to the 2nd sealing member 42, the valve main body 10, the rotating shaft 30A, etc. can be reduced.

In 2nd Embodiment mentioned above, although the press member 50 is equipped with the compression coil spring 52, it is not limited to this. Instead of this compression coil spring 52, for example, as shown in FIG. 4, the flow rate adjustment of the structure using the press member 50A provided with the compression spring 53 which overlaps the several leaf spring formed in the annular shape. It is good also as a valve 1B, and the structure of the press member 50 is arbitrary, unless it opposes the objective of this invention. The same applies to the first embodiment described above.

In addition, in 2nd Embodiment mentioned above, although the 2nd sealing member 42 is comprised by the one member formed in the annular shape, it is not limited to this. Instead of such a second seal member 42, for example, as shown in Fig. 5, the partial seal member 42a having the same configuration as the first seal member 41, the second seal member 42, The flow control valve 1C may be configured using the second seal member 42A formed by combining the partial seal members 42b having the same configuration, and the second seal member may be used as long as it is not contrary to the object of the present invention. The configuration is arbitrary. The same applies to the first seal member 41. The same applies to the seal member 40 of the first embodiment described above.

In addition, in 2nd Embodiment mentioned above, even when 30 A of rotation shafts move to the line P direction, the 1st sealing member 41 which moves with 30 A of said rotation shafts will be radially connected with the valve main body 10. The movable amount of the rotary shaft 30A in the line P direction or the first inner circumferential surface 13c and the second of the valve body 10 so as to maintain the state sandwiched between the rotary shafts 30 (that is, to exhibit a sealing function). The shape of the inner circumferential surface 13d is set, whereby the pressure generated by the expansion of the liquid in the liquid encapsulation state is released to the outside only through the gap (clearance) between the upper wall portion 10a and the rotation shaft 30A. However, it is not limited to this.

For example, as shown in (a) and (b) of FIG. 6, in the above-described configuration of the flow regulating valve 1A, the rotating shaft 30A is in the liquid-sealed state at the lower side of the drawing (that is, in the other direction in the claims). 1st inner peripheral surface 13c and 2nd inner peripheral surface 13d are provided so that the 1st sealing member 41 may move away from the 1st inner peripheral surface 13c, and may oppose the 2nd inner peripheral surface 13d at intervals when it moves to In the configuration (specifically, in the configuration of the flow regulating valve 1A, the boundary K of the first inner circumferential surface 13c and the second inner circumferential surface 13d of the valve body 10 is moved upward in the drawing). One flow control valve 1D may be used. 6 is an enlarged cross-sectional view illustrating a configuration of a third modification of the flow regulating valve of FIG. 2, (a) is an enlarged cross-sectional view showing a normal state, and (b) is a pressure increase at the time of liquid filling. It is an expanded sectional view which shows the state to which the rotating shaft moved.

Similarly, for example, as shown in (a) and (b) of FIG. 7, in the configuration of the flow regulating valve 1C of the modification of the flow regulating valve 1A described above, the rotation shaft 30A is in a liquid encapsulation state. When the first seal member 41 moves away from the first inner circumferential surface 13c and faces the second inner circumferential surface 13d at the time of moving toward the lower side (that is, the other direction in the claims) in FIG. 13c) and the structure which provided the 2nd inner peripheral surface 13d (specifically, in the structure of 1 C of flow control valves, the boundary K of the 1st inner peripheral surface 13c of the valve main body 10, and the 2nd inner peripheral surface 13d). May be used as the flow control valve 1E. 7 is an enlarged sectional view showing a configuration of a fourth modified example of the flow regulating valve of FIG. 2, (a) is an enlarged sectional view showing a normal state, and (b) is a pressure increase during liquid filling. It is an expanded sectional view which shows the state to which the rotating shaft moved.

In other words, the flow regulating valve 1D; Or 1 E of the flow rate control valve, the first seal member 41 moves away from the first inner circumferential surface 13c and moves away from the first inner circumferential surface 13d as it moves downward in the drawing of the rotation shaft 30A. The rotating shaft 30A may be provided so as to be movable so as to be moved to an opposite position at intervals.

By setting it as such a structure, the liquid sealing state was generated between the 1st sealing member 41 and the 2nd sealing member 42, for example in the flow regulating valve 1D of FIG.6 (a), (b). In some cases, even when the liquid penetrating into the gap space S due to the temperature change expands, the rotating shaft 30A moves downward in the drawing, and as in the above-described embodiment, the pressure is applied to the upper wall portion 10a and the rotating shaft. It is possible to release to the outside through the gap between 30A, and the first seal member 41 moves away from the first inner circumferential surface 13c and the second inner circumferential surface 13d in accordance with the movement of this rotational axis 30A. It moves to the position which opposes at intervals, and it can reliably release a liquid (namely, pressure) through the space | interval (gap) between the 1st sealing member 41 and the 2nd inner peripheral surface 13d.

Moreover, especially in the structure of the flow control valve 1E shown to FIG.7 (a), (b), the partial sealing member 42a of the 1st sealing member 41 and the 2nd sealing member 42 is carried out. Liquid encapsulation may occur in the interstitial space S ″, and the liquid in the interstitial space S ″ is interposed between the upper wall portion 10a and the partial sealing member 42a. Even if this occurs, it is not released through a gap (clearance) between the upper wall portion 10a and the rotation shaft 30A. However, in the flow rate control valve 1E, when the rotating shaft 30A moves downward in the drawing due to the expansion of the liquid, the first sealing member 41 moves to the first inner circumferential surface 13c according to the movement of the rotating shaft 30A. ) And move to a position opposite to the second inner circumferential surface 13d at intervals, and through the space (gap) between the first seal member 41 and the second inner circumferential surface 13d, the gap space S ″. Can freely release the liquid (that is, the pressure).

In addition, embodiment mentioned above is only what showed the typical form of this invention, and this invention is not limited to embodiment. In other words, the present invention can be modified in various ways without departing from the gist of the present invention.

1, 1 A flow control valve (valve unit)
10 Valve Body (Case)
10a Upper wall part (seal member support part, 2nd seal member support part)
13 valve chamber
13a valve body receiving part
13b rotating shaft receiving part
20 valve body
30, 30A rotating shaft
31 Rotating shaft body
32 Flange (First Seal Member Support)
40 seals absence
41 first seal member
42 second seal member
50 compression member
51 color

Claims (4)

The case,
A cylindrical or cylindrical rotating shaft penetrating the case and rotatably installed about an axis;
An annular seal member inserted into the rotation shaft and disposed between the case and the rotation shaft in a radial direction;
A seal member support provided on the case or the rotational shaft to restrict movement of the seal member in one direction parallel to the shaft center;
A pressing member for pressing the seal member toward the seal member support portion toward the one direction;
The seal structure of the rotating shaft comprising a. The case,
A cylindrical or cylindrical rotating shaft penetrating the case, rotatably around the shaft center and movably in the axial direction;
An annular first seal member inserted into the rotation shaft and disposed between the case and the rotation shaft in a radial direction;
A flange-shaped first seal member support portion provided on the rotation shaft;
An annular second inserted into the rotation shaft and disposed in parallel between the case and the rotation shaft in a radial direction, and arranged side by side in the axial direction with the first seal member bearing portion therebetween; With seal member,
The first seal member support portion and the shaft center are configured to restrict movement of the second seal member in one direction parallel to the axis center and to sandwich the second seal member between the first seal member support portion. A second seal member support portion provided in the case so as to face in a direction;
A pressing member for pressing the first seal member toward the first seal member support portion toward the one direction;
The seal structure of the rotating shaft comprising a. The said case is a 1st inner peripheral surface which pinches | interposes the said 1st sealing member between the said rotating shaft, and the 2nd which is continuous in the side far from the said 2nd sealing member base part of the said 1st inner peripheral surface. The inner circumference is prepared,
The first inner circumferential surface is formed to have a uniform inner diameter over the axial direction,
The second inner circumferential surface is formed to gradually increase the inner diameter as it faces another direction opposite to the one direction,
The first inner circumferential surface and the second inner circumferential surface are provided such that the first seal member moves away from the first inner circumferential surface and faces the second inner circumferential surface at a time when the rotating shaft moves in the other direction in the liquid encapsulation state. Seal structure of the rotating shaft, characterized in that. A valve body having a valve body provided with a valve chamber, a valve body rotatably housed in the valve chamber, and a cylindrical or cylindrical rotation shaft attached to the valve body and penetrating the valve body and rotatably installed about an axis. In the device,
A valve device comprising the seal structure of the rotating shaft according to any one of claims 1 to 3, as the seal structure of the rotating shaft.

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