JP2009243522A - Safety valve and sealing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety valve and a sealing structure, easily assembling an annular elastic member, accurately setting working pressure of a valve, not changing the set pressure with age, improving durability of the annular elastic member, reducing the number of components to reduce production cost, and improving productivity. <P>SOLUTION: This safety valve includes: a cylindrical body 11 provided with a channel 14; a valve element 21 disposed in the channel 14, relatively moved along the direction of the axis C of the cylindrical body 11, and pressed to one side in the direction of the axis C by a pressing means 22; a stand member 12 arranged at one side of the cylindrical body 11, provided with an inflow hole 12c communicating with the channel 14, and receiving fluid; and a chamber 18 sandwiched between a first recessed portion 15 formed in one end of the cylindrical body 11 and a second recessed portion 17 formed in the other end of the stand member 12, having the opened radially inward other end, and formed from a substantially ring hole-shaped space. The annular elastic member 19 sealing the channel 14 by being brought into contact with the valve element 21 is disposed in the chamber 18. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a safety valve and a seal structure for adjusting the pressure of a fluid such as gas.

  Conventionally, as a safety valve for adjusting the pressure of a fluid such as gas, for example, one disclosed in Patent Document 1 is known. The safety valve of Patent Document 1 is a cylindrical valve housing having an inflow hole (passage) connected to a fluid flow path, and is capable of relative movement in the axial direction inside the valve housing and attached toward the inflow hole. It is configured to include a biased valve body, and an annular elastic member (O-ring) capable of sealing the gap by contacting the valve housing and the valve body.

When the pressure of the fluid rises above a preset pressure, the pressure exceeds the biasing force of the valve spring that biases the valve body, and the valve body moves toward the side opposite to the inflow hole. Thus, the sealing of the O-ring is released, the fluid is discharged to the outside of the safety valve, and the pressure of the fluid is reduced. After the pressure of the fluid is sufficiently reduced, the biasing force of the valve spring exceeds the pressure, the valve body is returned to the original position, and the O-ring seals the fluid again.
In addition, the electromagnetic valve disclosed in Patent Document 2 also describes a configuration in which a fluid is sealed with an O-ring.
JP 2004-340265 A JP 2003-269642 A

By the way, in the structure of the valve that seals the fluid using the O-ring as described above, there are the following common problems.
That is, when an O-ring is incorporated in the apparatus, the O-ring is twisted or waved due to a step formed on the inner surface of the flow path or frictional resistance with the inner surface while the O-ring is inserted. May be deformed. If the O-ring is incorporated in the apparatus in a deformed state in this way, the accuracy of contact with the valve body cannot be ensured, the sealing performance is deteriorated, and the problem arises that the valve does not operate accurately at the set pressure.

  In addition, a space opened to come into contact with the valve body is provided around the O-ring after being assembled, but the deformed O-ring is slightly deformed over time toward the space. The working pressure set at the time is different from the working pressure measured at the time of the shipping inspection, and it is necessary to adjust the working pressure again before shipping, which hinders workability.

Moreover, since an unreasonable force is applied to the O-ring that has been deformed and incorporated in this manner, there is a problem that deterioration tends to proceed at an early stage.
In addition, since adjustment when incorporating an O-ring into the device requires skill of the operator, a deteriorated O-ring is replaced with a new one, or a commercially available O-ring with a different material corresponding to the type of fluid such as gas. It was difficult to exchange.

Further, in the case where a protruding corner portion for fixing the O-ring is formed in a portion where the O-ring is arranged in the apparatus, the tip of the corner portion damages the O-ring and reduces the sealing performance. Therefore, it is necessary to precisely process the corner portion, and the processing cost is high.
Further, when an O-ring receiving member or the like for disposing the O-ring is incorporated in the apparatus, the O-ring receiving member or the like and the peripheral member are prevented from being separated from the sealing surface to deteriorate the sealing performance. In order to ensure the sealing performance, packing or the like is required separately, which increases the number of parts and increases the production cost.

  The present invention has been made in view of the above-described circumstances, and can be easily incorporated into an annular elastic member and can accurately set the operating pressure of a valve, so that the set pressure does not change with time. An object of the present invention is to provide a safety valve and a seal structure in which the durability of the annular elastic member is improved, the number of parts is reduced, the production cost can be reduced, and the productivity is increased.

In order to achieve the above object, the present invention proposes the following means.
That is, the safety valve of the present invention includes a cylinder main body provided with a flow path, and a relative movement with respect to the cylinder main body that is disposed in the flow path along the axial direction of the cylinder main body, and is one side in the axial direction by an urging means. A valve member that is urged toward the tube, a stand member that is disposed on one side of the cylinder body and that has an inflow hole that communicates with the flow path and receives fluid, and a first member that is formed at an end portion on one side of the cylinder body. A chamber composed of a substantially ring-shaped space that is sandwiched between one recess and a second recess formed at the other end of the stand member and that opens on the other radially inner side; An annular elastic member that contacts the valve body and seals the flow path.

  According to the safety valve of the present invention, a flow path is provided in a chamber composed of a substantially ring-shaped space formed by being sandwiched between a first recess on one side of the cylinder body and a second recess on the other side of the stand member. Since the annular elastic member for sealing is arranged, when the annular elastic member is incorporated into the apparatus, the end surface on one side or the other side of the annular elastic member is brought into contact with the first recess or the second recess and is stable. The annular elastic member can be prevented from being deformed such as torsion and undulation during assembly.

  That is, as in the prior art, the annular elastic member is inserted while sliding on the inner wall of the flow path, and the annular elastic member is deformed by a step formed in the flow path or a frictional resistance with the flow path. Therefore, it can be easily and accurately incorporated into the apparatus, and the operating pressure of the valve can be set accurately. Further, when the annular elastic member is incorporated into the apparatus, the operator does not need skill and can be easily exchanged for various uses.

  In addition, according to the method for pressing the annular elastic member according to the present structure, the built-in annular elastic member is not subjected to excessive force due to deformation or the like as in the prior art, so that the operating pressure set at the time of incorporation does not increase with time. There is no change, and the setting of the operating pressure is stably maintained over a long period of time. In addition, since the change with time does not occur, the readjustment work of the working pressure that has been performed at the time of product inspection as in the past can be reduced, and workability and productivity are improved. Further, since an unreasonable force such as deformation is not applied, the durability of the annular elastic member is improved.

  In addition, since the annular elastic member after being incorporated is fixed in a stable state with one side and the other side sandwiched between the first recess and the second recess, a fluid pressure exceeding the set pressure is applied from the inflow hole. Even when the valve is actuated, it does not move to one side or the other side due to the pressure. Further, even when the valve is frequently operated, the accuracy of the operating pressure of the apparatus is stably secured, and the reproducibility is excellent.

  In addition, since the annular elastic member disposed in the chamber formed so as to be surrounded by the first recess and the second recess is fixed in contact with the inner surfaces of the first recess and the second recess, Damage to the outer surface is prevented. That is, as in the prior art, a protruding corner portion or the like protruding toward the inside of the chamber is formed, and the corner portion contacts the annular elastic member and damages the outer surface, thereby reducing the sealing performance of the valve. In addition, the fine and difficult processing required for forming corners and the like is not necessary, and the processing cost is reduced.

  Further, since the annular elastic member is fixed so as to be sandwiched between two parts of the first concave portion of the cylinder main body and the second concave portion of the stand member, in addition to these cylindrical main body and stand member, separately, There is no need to incorporate a receiving member or the like for disposing the annular elastic member into the apparatus, and there is no need for a packing or the like for securing the sealing performance between the receiving member or the like and the peripheral member. Reduced production costs.

  Further, in the safety valve of the present invention, the first recess has an end surface orthogonal to the axial direction and facing one side and an inner peripheral surface facing radially inward, and the second recess is orthogonal to the axial direction. However, it may have an end surface facing the other side and an outer peripheral surface facing radially outward.

  According to the present invention, one side, the other side, the radially inner side, and the radially outer side of the chamber formed by the first recess and the second recess are all formed by a plane and a curved surface that do not form corners or the like. Therefore, the annular elastic member disposed in the chamber is fixed in contact with the flat surface and the curved surface, and it is reliably prevented that the outer surface is damaged.

  Moreover, the safety valve of this invention WHEREIN: The said valve body is good also as the outer peripheral edge of one side being formed in the shape of a smooth curved surface, and the said outer peripheral edge contacting the said cyclic | annular elastic member.

  According to the present invention, the outer peripheral edge on one side of the valve body that contacts the annular elastic member and seals the fluid is formed in a smooth curved surface, and the outer peripheral edge contacts the annular elastic member. Therefore, the annular elastic member is prevented from being damaged by the contact of the valve body. That is, when the outer peripheral edge that contacts the annular elastic member of the valve body is formed with, for example, a convex corner as in the conventional case, the corner is damaged when pressing the annular elastic member, There is no such thing as reducing the sealing performance.

  In addition, since the outer peripheral edge of the valve body is formed in a curved surface, the valve body and the annular elastic member come into contact with each other around the outer peripheral edge in a state close to a line contact. Therefore, a high airtightness can be obtained without requiring a large urging force for the urging means for urging the valve body. Further, since the urging force of the valve body can be reduced, the durability of the annular elastic member is improved, and the apparatus can be used stably over a long period of time.

  Further, the seal structure of the present invention includes a first flow path through which a fluid passes, a second flow path that is disposed on one side of the first flow path and communicates with the first flow path, and the first flow path. A valve body movably disposed on one side and the other side in one flow path, the first flow path and the second flow path are connected, and the radially inner other side is A chamber composed of a substantially ring-hole-shaped space that opens toward the first flow path; and an annular elastic member disposed in the chamber, the other radially inner side of the annular elastic member being the valve body The first flow path and the second flow path can be opened and closed by coming into contact with the outer peripheral edge on one side.

  According to the safety valve and the seal structure of the present invention, the annular elastic member can be easily incorporated and the operating pressure of the valve can be set with high accuracy, and the set pressure does not change with time. Durability is improved, the number of parts is reduced, production costs can be reduced, and productivity is increased.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side sectional view showing a schematic configuration of a safety valve according to one embodiment of the present invention, and FIG. 2 is a partial side sectional view showing a schematic configuration in the vicinity of an annular elastic member of the safety valve according to one embodiment of the present invention.

The safety valve 10 of the present embodiment is intended for various gases as fluids, for example, and is installed in a communication state with a gas path such as a pipe or instrument, and when the internal pressure of the gas path exceeds a preset operating pressure, The pressure of the pressure is released to the outside of the device and adjusted so as to be equal to or lower than the operating pressure.
As shown in FIG. 1, the safety valve 10 of the present embodiment includes a substantially multi-stage cylindrical tube body 11 and a stand member 12 disposed on one side (left side in FIG. 1) of the tube body 11 in the axis C direction. And a cap 13 disposed on the other side (right side in FIG. 1) of the cylinder body 11 in the axis C direction.

  The cylinder body 11 has a substantially hexagonal cross section perpendicular to the axis C of the outer portion 11a. A cylindrical portion 11b having a diameter smaller than that of the outer portion 11a is formed on one side of the outer portion 11a, and the outer periphery of the cylindrical portion 11b is subjected to male screw processing. In addition, one end face of the cylindrical portion 11b is a substantially ring-shaped plane 11c orthogonal to the axis C. Further, a substantially multi-stage cylindrical hole-like flow path (first flow path) 14 for passing a fluid through the inside thereof is formed in the cylinder body 11 so as to penetrate in the axis C direction.

  The flow path 14 has a central portion in the direction of the axis C formed in a cylindrical hole shape, and has a female screw portion whose diameter is larger than that of the central portion on the other side of the central portion and whose inner periphery is processed with a female screw. 14a. In addition, an inclined surface 14b is formed on one side of the central portion of the flow path 14 so as to be gradually reduced inward in the radial direction from the end of the central portion toward the one side. Further, at one end portion of the inclined surface 14b, a reduced diameter portion 14c that is connected to the end portion and is parallel to the axis C or in the shape of a cylindrical hole or a disk hole is provided.

  In addition, an end face 15a is formed at one end of the reduced diameter portion 14c. The end face 15a is formed from a substantially ring-shaped plane extending from the end to the outside in the radial direction perpendicular to the axis C and facing the one side. . Further, an inner peripheral surface 15b extending from the end portion to one side in parallel to the axis C and facing inward in the radial direction is formed at the radially outer end portion of the end surface 15a. Further, one end portion of the inner peripheral surface 15b is connected to the radially inner end portion of the flat surface 11c. And the 1st recessed part 15 which consists of an end surface 15a and the internal peripheral surface 15b is formed.

  Further, the stand member 12 has a cross section perpendicular to the axis C of the outer portion 12 a formed in a substantially hexagonal shape, and the opposite side dimension of the outer portion 12 a is substantially the same as the opposite side dimension of the outer portion 11 a of the cylinder body 11. Is set. Further, a tapered portion 12b having a diameter smaller than that of the outer shape portion 12a is formed on one side of the outer shape portion 12a, and a taper male screw process is applied to the outer periphery of the tapered portion 12b. A cylindrical hole-like inflow hole (second flow path) 12c is opened on one end face of the tapered portion 12b, and the inflow hole 12c penetrates the stand member 12 in the axis C direction.

  On the other end face of the outer shape portion 12a of the stand member 12, a cylindrical hole portion 16 having a substantially cylindrical hole shape that is opened in the direction of the axis C is formed. The cylindrical hole portion 16 is internally threaded and is threadedly engaged with the outer periphery of the cylindrical portion 11b of the cylindrical body 11.

  In addition, an end surface 17a is formed on the bottom of the cylindrical hole portion 16 from the end portion on one side of the cylindrical hole portion so as to extend inward in the radial direction perpendicular to the axis C and to face the other side. Has been. Further, an outer peripheral surface 17b extending from the end portion to the other side in parallel to the axis C is formed at the radially inner end portion of the end surface 17a. And the 2nd recessed part 17 which consists of an end surface 17a and the outer peripheral surface 17b is formed. The other end surface of the outer peripheral surface 17b is a substantially ring-shaped plane 12d orthogonal to the axis C. The radially inner end of the flat surface 12d is connected to the other end of the inflow hole 12c.

  A substantially ring-shaped space sandwiched between a first recess 15 formed near one end of the cylinder body 11 and a second recess 17 formed near the other end of the stand member 12. Is a chamber 18. The chamber 18 is formed with an end surface 17a of the stand member 12 on one side in the direction of the axis C, and is formed with an end surface 15a of the cylinder body 11 on the other side, and the radially inner side perpendicular to the axis C is the outer peripheral surface 17b of the stand member 12. The outer side in the radial direction is formed by the inner peripheral surface 15 b of the cylinder main body 11. Further, the end face 15a and the outer peripheral face 17b are not in contact with each other, and a slight gap is provided. That is, the other inner side in the radial direction of the chamber 18 opens toward the flow path 14. The chamber 18 is provided with an O-ring (annular elastic member) 19 made of synthetic rubber or the like corresponding to the type of fluid.

  The O-ring 19 has a substantially circular cross section. One side in the direction of the axis C is in contact with the end surface 17a, the other side is in contact with the end surface 15a, and the radially inner side perpendicular to the axis C is on the outer peripheral surface 17b. Abutting radially outward is in contact with the inner peripheral surface 15b. The O-ring 19 has a radially inner side portion corresponding to the gap between the end surface 15a and the outer peripheral surface 17b facing the flow path 14, and this portion contacts a valve body 21 described later. It comes to touch.

  The cap 13 has a cross section orthogonal to the axis C of the outer shape portion 13 a formed in a substantially hexagonal shape, and the opposite side dimension of the outer shape portion 13 a is set to be substantially the same as the opposite side size of the outer shape portion 11 a of the cylinder body 11. Has been. Further, a substantially cylindrical tube portion 13b having a diameter smaller than that of the outer shape portion 13a is formed on the other side of the outer shape portion 13a. Further, a cylindrical hole-shaped outflow hole 13c is opened on the other end face of the tube portion 13b, and the outflow hole 13c penetrates the cap 13 in the axis C direction.

  A substantially multi-stage cylindrical hole 13d that is opened in the direction of the axis C is formed on one end face of the outer shape portion 13a of the cap 13. The hole portion 13d has an O-ring 20 disposed at a large diameter portion formed at one end thereof, and a small diameter portion having a diameter smaller than that of the large diameter portion on the other side of the large diameter portion. Is formed. And the internal diameter of this small diameter part is made into the same dimension as the internal thread part 14a of the cylinder main body 11, and the internal thread process is given to the internal peripheral surface of this small diameter part. Further, the other end of the small diameter portion communicates with the outflow hole 13c.

  Further, a valve body 21 is inserted and disposed in the flow path 14 of the cylinder body 11. The valve body 21 has a substantially hexagonal cross section orthogonal to the axis C of the outer portion 21a, and the diagonal dimension of the outer portion 21a is set slightly smaller than the inner diameter of the flow path 14. The flow path 14 can be relatively moved in the direction of the axis C. Further, a substantially cylindrical reduced diameter portion 21b having a diameter smaller than that of the outer shape portion 21a is formed on one side of the outer shape portion 21a. The outer peripheral edge 21c on one side of the reduced diameter portion 21b is formed in a smooth curved surface. An outer peripheral edge 21 c of the valve body 21 is disposed in contact with the O-ring 19 of the chamber 18. Further, a flat surface 21 d orthogonal to the axis C is formed at one end of the outer peripheral edge 21 c and is in contact with the flat surface 12 d of the stand member 12.

  In addition, a substantially cylindrical hole-shaped hole portion 21e that is opened in the direction of the axis C is formed on the other end surface of the valve body 21. An elastic member (biasing means) 22 made of a compression coil spring is inserted into the hole 21e, and one end of the elastic member 22 is in contact with the bottom surface of the hole 21e. An adjustment screw 23 is disposed at the other end of the elastic member 22. The adjusting screw 23 has a substantially cylindrical shape, and an outer peripheral surface thereof is subjected to male screw processing. The outer peripheral surface is screwed into the female screw portion 14a of the cylinder body 11 and the hole portion 13d of the cap 13 respectively. ing.

  Further, the adjusting screw 23 is provided with a through hole 23a extending in the direction of the axis C, and one end portion of the through hole 23a is formed with a diameter larger than that of the other end portion. The other end portion of the elastic member 22 is in contact with the bottom surface facing one side of the portion. The adjustment screw 23 can adjust the relative position of the cylinder body 11 in the direction of the axis C by the screwing. Reference numeral 23b in the figure denotes an adjustment hole for adjusting the screwing.

  Further, in this way, the flow path 14 of the cylinder main body 11, the valve body 21 that is movable in the direction of the axis C in the flow path 14 and is urged to one side by the elastic member 22, and the stand member that communicates with the flow path 14. A seal structure 24 having 12 inflow holes 12 c, a chamber 18, and an O-ring 19 is formed.

Next, the operation of the safety valve 10 will be described.
FIG. 2A shows the closed state of the safety valve 10, the outer peripheral edge 21 c of the valve body 21 is in contact with the O-ring 19, and the fluid flowing in from one side of the inflow hole 12 c is allowed to flow into the outer peripheral end. Sealed at the edge 21c. That is, the fluid pressure is in a state of a value smaller than the biasing force by which the elastic member 22 biases the valve body 21 to one side.

  When the fluid pressure exceeds the urging force of the elastic member 22, the valve body 21 moves to the other side in the direction of the axis C against the urging force, as shown in FIG. Is opened. That is, the fluid flows out from the outer peripheral edge 21c of the valve body 21 and the O-ring 19 to the other side in the direction of the arrow in the figure. The fluid flowing out from the outer peripheral edge 21c toward the other side passes through the gap between the inner periphery of the substantially cylindrical hole-shaped flow path 14 and the outer periphery of the valve body 21 having a substantially hexagonal cross section, and the through hole 23a of the adjusting screw 23 It is discharged from the outflow hole 13c of the cap 13 to the outside of the apparatus. When the fluid is discharged from the safety valve 10 to the outside and returns to a value lower than the preset operating pressure, the valve body 21 is again closed by the urging force of the elastic member 22 as shown in FIG. Return to the state.

  As described above, according to the safety valve 10 of the present embodiment, the safety valve 10 is sandwiched between the first recess 15 at one end of the cylinder body 11 and the second recess 17 at the other end of the stand member 12. Since the O-ring 19 for sealing the flow path 14 is disposed in the chamber 18 to be formed, when the O-ring 19 is incorporated into the apparatus, the other end surface of the O-ring 19 is formed in the first recess 15. It can be pushed and inserted into the flow path 14 in a stable state. Therefore, deformation such as twisting and undulation is prevented when the O-ring 19 is assembled.

  That is, unlike the conventional case, the O-ring is inserted while sliding on the inner wall of the flow path, and the O-ring is not deformed by a step formed in the flow path or friction with the flow path. Therefore, it can be easily and accurately incorporated into the apparatus, and the operating pressure of the valve can be set accurately. Further, when incorporating the O-ring 19 into the apparatus, the operator does not require skill and can be easily exchanged for various uses such as gas type change.

  In addition, since an unreasonable force due to deformation or the like is not applied to the assembled O-ring 19 as in the prior art, the pressure set at the time of incorporation does not change over time, and the operating pressure is maintained for a long time. It is maintained stably for a long time. In addition, since the change with time does not occur, it is possible to reduce the work of readjusting the operating pressure that has been performed at the time of product inspection, and the workability and productivity are improved. Further, since an excessive force is not applied, the durability of the O-ring 19 is improved, and the apparatus can be used stably over a long period of time.

  Further, the incorporated O-ring 19 is disposed in the chamber 18 in a stable state, with the one side abutting against the first recess 15 and the other side abutting against the second recess 17. Therefore, even when the pressure of the fluid far exceeding the operating pressure is applied and the valve is operated, it is not moved to one side or the other side by the pressure. Further, since the position does not fluctuate even when the valve is operated frequently, the accuracy of the operating pressure of the apparatus is stably secured, and the reproducibility is excellent.

  Further, since the O-ring 19 is fixed so as to be sandwiched between two parts of the first concave portion 15 of the cylindrical main body 11 and the second concave portion 17 of the stand member 12, these cylindrical main body 11 and stand member are conventionally provided. 12, there is no need to incorporate a receiving member or the like for disposing an O-ring 19 in the apparatus, and there is a packing or the like for ensuring the sealing performance between the receiving member and the peripheral member. It is unnecessary, the number of parts is reduced, and the production cost is reduced.

  In addition, the chamber 18 is formed of a flat surface and a curved surface, each of which forms one side, the other side, the radially inner side and the radially outer side, all of which do not form corners or the like. The arranged O-ring 19 is not damaged on its outer surface. Therefore, as in the conventional case, a protruding corner portion or the like projecting inward of the chamber 18 is formed, and the corner portion or the like comes into contact with the O-ring 19 and is damaged, thereby reducing the sealing performance of the valve. In addition, the fine and difficult processing required when forming corners and the like is unnecessary, and the processing cost is reduced.

  Further, since the outer peripheral edge 21c on one side of the valve body 21 that contacts the O-ring 19 and seals the fluid is formed in a smooth curved surface, the O-ring 19 is damaged by the contact of the valve body 21. Is prevented. That is, as in the prior art, the outer peripheral edge that contacts the O-ring of the valve body is formed with a convex corner or the like, and the corner or the like is damaged when pressing the O-ring, thereby reducing the sealing performance. There is no such thing as

  In addition, since the outer peripheral edge 21c is formed in a smooth curved surface, the valve body 21 and the O-ring 19 are in contact with each other around the outer peripheral edge 21c in a state close to line contact. Since the area is reduced, the elastic member 22 that urges the valve body 21 does not require a large urging force, and high airtightness can be obtained. Moreover, since the urging force of the valve body 21 can be reduced in this way, the durability of the O-ring 19 is further improved.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the present embodiment, the seal structure 24 is described as being used for the safety valve 10. However, the present invention is not limited to this, and the seal structure 24 uses a pressure reducing valve for analysis-related gas, a check valve, and grease. If this is the case, it can be used appropriately as the seal structure 24 of various devices, for example, when there is gas contamination.

  Further, in the present embodiment, the chamber 18 is described as being formed in a substantially ring hole shape by being sandwiched between the end surface 15a and the inner peripheral surface 15b of the first recess 15 and the end surface 17a and the outer peripheral surface 17b of the second recess 17. However, the present invention is not limited to this, and the first concave portion 15 and the second concave portion 17 are formed by respective concave grooves each having a substantially fan-shaped cross section perpendicular to the axis C, and these are arranged to face each other to form the chamber 18. It doesn't matter.

  In the present embodiment, the outer peripheral edge 21c of the valve body 21 has been described as being formed in a smooth curved surface. However, the present invention is not limited to this, and the valve body 21 may be formed with a flat surface or a corner. However, in view of the durability of the O-ring 19, it is more preferable to form a curved surface as in the present embodiment.

  In the present embodiment, the O-ring 19 is used as the annular elastic member. However, the O-ring 19 is not limited to this as long as the fluid can be sealed, and other resin materials or the like may be molded. I do not care. Also, the material is not limited to the synthetic rubber of this embodiment.

It is a sectional side view showing the schematic structure of the safety valve concerning one embodiment of the present invention. It is a fragmentary sectional side view which shows schematic structure of the cyclic | annular elastic member vicinity of the safety valve which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Safety valve 11 Cylinder main body 12 Stand member 12c Inflow hole (2nd flow path)
14 channel (first channel)
15 1st recessed part 15a End surface 15b Inner peripheral surface 17 2nd recessed part 17a End surface 17b Outer peripheral surface 18 Chamber 19 O ring (annular elastic member)
21 Valve body 21c Outer peripheral edge 22 Elastic member (biasing means)
24 Seal structure C axis

Claims (4)

A cylinder body provided with a flow path;
A valve body disposed in the flow path and movable relative to the cylinder body along the axial direction of the cylinder body, and biased to one side in the axial direction by a biasing means;
A stand member disposed on one side of the cylinder body and having an inflow hole communicating with the flow path to receive a fluid;
A substantially ring hole that is sandwiched between a first recess formed at one end of the cylinder body and a second recess formed at the other end of the stand member, and the other radially inner side opens. A safety valve comprising: a chamber made of a space, and an annular elastic member that contacts the valve body and seals the flow path. The safety valve according to claim 1,
The first recess has an end surface orthogonal to the axial direction and facing one side and an inner peripheral surface facing radially inward,
2. The safety valve according to claim 1, wherein the second recess has an end face that is orthogonal to the axial direction and faces the other side, and an outer peripheral face that faces radially outward. The safety valve according to claim 1 or 2,
The valve body is formed in a smooth curved surface at the outer peripheral edge on one side,
The safety valve according to claim 1, wherein the outer peripheral edge contacts the annular elastic member. A first flow path for passing fluid;
A second flow path disposed on one side of the first flow path and communicating with the first flow path;
A valve body disposed so as to be movable in one side and the other side in the first flow path;
A chamber formed of a substantially ring-hole-shaped space that connects the first flow path and the second flow path, and the other radially inner side opens toward the first flow path;
An annular elastic member disposed in the chamber,
The other radially inner side of the annular elastic member is in contact with the outer peripheral edge of one side of the valve body so that the first channel and the second channel can be opened and closed. Seal structure.

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