JP2013133921A - Depressurizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a depressurizing device capable of preventing chattering.SOLUTION: A depressurizing device 1 is mounted in a depressurizing hole 3 which is formed inside of a protected body 2 in which pressure is generated, so as to communicate with the inside of the protected body. The depressurizing device 1 includes a channel casing 10, a movable member 30, an energizing member 80, and a valve element 51. The channel casing 10 is communicated with the depressurizing hole 3 and in the channel casing 10, a first opening part 40 and a second opening part 50 are provided which are communicated with the outside. The movable member 30 is provided so as to close the first opening part 40 of the channel casing 10, and is provided movably with pressure inside of the protected body 2 acting from the first opening part 40. The energizing member 80 energizes the movable member 30 in a direction to close the first opening part 40. The valve element 51 closes the second opening part 50 and opens the second opening part 50 as the movable member 30 moves by a prescribed amount.

Description

  The present invention relates to a depressurization device that is attached to a depressurization hole that is formed so that pressure is communicated with an inside of a protected body.

  Safety valves are used in pressure vessels and piping to avoid dangers such as explosion due to an increase in internal pressure.

  The safety valve is configured such that the valve body is kept closed by a spring or the like until a predetermined pressure is received, and the valve body is opened and the pressure is released when the pressure exceeds the predetermined pressure.

  Here, in a spring-type safety valve, the pressure drops after the valve body opens, the valve body closes due to the bias of the spring, and when the pressure increases again, the valve opens repeatedly. There was a risk of chattering repeatedly colliding. For this reason, a technology that suppresses the occurrence of large impacts due to chattering by providing a pressure regulating chamber and providing a throttle passage between the pressure regulating chamber and the discharge port to prevent large pressure fluctuations in the pressure regulating chamber. Has been proposed (see, for example, Patent Document 1).

JP-A-10-274349

  However, in the safety valve (depressurization device) of Patent Document 1, since the valve once opened is closed by the biasing of the spring according to the pressure reduction, the occurrence of chattering cannot be prevented. Moreover, high pressure was repeatedly applied, and there was a fear that the spring and the valve were fatigued.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a depressurization device capable of preventing chattering.

In order to solve the above problems, the present invention proposes the following means.
The present invention is a depressurization device attached to a depressurization hole formed so as to communicate with the inside of a protected body generating pressure, and communicates with the depressurization hole and communicates with the outside. A flow path housing provided with a first opening and a second opening, and the protected body that is provided so as to be able to close the first opening of the flow path housing and that acts from the first opening. A moving member movably provided by an internal pressure, an urging member for urging the moving member in a direction to close the first opening, the second opening being closed, and the moving member And a valve body that opens the second opening by moving a predetermined amount.

  According to such a depressurization device, the pressure inside the protected body increases and the moving member moves a predetermined amount by exceeding the urging force by the urging member, thereby opening the first opening. The second opening is opened by the valve body. For this reason, even if the moving member moves by being urged by the urging member as the internal pressure subsequently decreases, the second opening is kept open even if the first opening is closed. .

  In the above depressurization device, the moving member regulates the valve body so as not to be opened from a state in which the second opening is closed while the first opening is closed, and the moving member Has a restricting portion for releasing the restriction on the valve body when it has moved by the predetermined amount.

  According to this configuration, the valve body is restricted to the state where the second opening is closed by the restricting portion of the moving member, but after the moving member has moved a predetermined amount, the restriction is released and the second opening is opened. It is kept in the state that was done.

  In the above depressurizing apparatus, the second opening is provided in a plurality so as to be equiangular around an axis parallel to a direction in which the moving member moves.

  According to this configuration, since the plurality of second openings are provided at equal angles around the axis, the pressure acting on the moving member via the valve body at the second openings is equiangular around the axis. Acts in multiple orientations. For this reason, since the pressure which acts on a moving member cancels out mutually, the smoothness of a movement of a moving member can be maintained reliably.

  In the above depressurizing device, the valve body is formed in an annular shape so as to surround the axis, and is advanced toward the valve body along the axis, thereby moving the valve body so as to close the second opening. It is characterized by providing an auxiliary member capable of this.

  According to this configuration, by moving the auxiliary member toward the valve body along the axis, the plurality of valve bodies can be moved at a time, and the plurality of second openings can be closed at a time. Thereby, the manual obstruction | occlusion operation | work of a some 2nd opening part can be made efficient.

  In the above depressurizing apparatus, it is characterized in that it comprises manual opening means for manually moving the moving member to open the valve body.

  According to such a configuration, the moving member can be moved by an arbitrary amount at an arbitrary time. For this reason, an opening part can be opened instantly at the time of emergency. Moreover, the operation | work which obstruct | occludes the 2nd opening part once opened by the valve body can be performed efficiently.

  In the above depressurization apparatus, the movement release means extends in a substantially horizontal direction with the axial direction of the shaft member at the tip end of the shaft member connected to the moving member, and is provided to be rotatable around the rotation axis. It is characterized by having a lever that moves the moving member in a direction to open the first opening by rotating in one direction.

    According to this configuration, the moving member can be manually moved easily by the lever. For this reason, the obstruction | occlusion work by the valve body of a 2nd opening part can be performed more efficiently.

  In the above depressurizing apparatus, the manual release means has a cam mechanism that moves the moving member in a direction to open the rotating member by rotating the moving member around the axis.

  According to this configuration, the moving member can be moved by rotating the moving member by the cam mechanism. For this reason, there is no need to provide a lever for moving the moving member, and when the manual operation is excessive in an emergency, the decompression device may be deformed or damaged due to the strong contact between the lever and the decompression device. Can be prevented.

  According to the depressurizing device of the present invention, chattering can be prevented from being generated by the second opening and the valve body as described above.

It is a sectional side view of the decompression device concerning a 1st embodiment of the present invention. It is a sectional side view of the principal part showing change of the decompression device concerning a 1st embodiment of the present invention, when (a) moving body moves up in the direction of an axis, (b) moving body goes down in the direction of an axis. It is the figure which showed the time of moving. It is a sectional side view of the decompression device concerning a 2nd embodiment of the present invention. It is sectional drawing of the horizontal direction of the 2nd opening part in the decompression apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing of the horizontal direction of the modification of the 2nd opening part in the decompression apparatus which concerns on 2nd Embodiment of this invention. It is a sectional side view of the decompression device concerning a 3rd embodiment of the present invention. It is a perspective view which shows the auxiliary member of the decompression apparatus which concerns on 3rd Embodiment of this invention. It is a figure which shows the action | operation of the auxiliary member of the decompression apparatus which concerns on 3rd Embodiment of this invention, Comprising: (a) Before the movement of an auxiliary member, (b) The figure which showed the time when the auxiliary member was moved to the axial direction upwards It is. It is a sectional side view of the decompression device concerning a 4th embodiment of the present invention. It is a sectional side view of the decompression apparatus which concerns on 5th Embodiment of this invention. It is a perspective view which shows the detail of the cam mechanism in the decompression apparatus which concerns on 5th Embodiment of this invention.

Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.
The depressurization device 1 according to the first embodiment is attached to a depressurization hole 3 formed so as to communicate with a protected body 2 that generates pressure inside by a fluid flowing inside, such as a pressure vessel or piping. . As shown in FIG. 1, the depressurization device 1 of the first embodiment is attached to the depressurization hole 3 of the protected body 2, and has a flow path housing 10 having a first opening 40 and a second opening 50. A cylindrical body 20 fixed to the flow path housing 10, a moving member 30 disposed inside the cylindrical body 20 so as to close the first opening 40, and a protrusion protruding from the moving member 30. The shaft member 60, the urging member 80 that urges the moving member 30 in the direction to close the first opening 40, the valve body 51 attached to the second opening 50, and the second with respect to the moving member 30. And a rotating shaft 52 of the valve body 51 provided on the opposite side of the opening.

  The flow channel housing 10 is formed in a multistage cylindrical shape (three steps in this embodiment), and one side of the flow channel housing 10 in the direction of the central axis C (hereinafter referred to as axis C) is removed from the protected body 2. It is attached to the outside of the pressure hole 3 and communicates with the inside of the protected body 2 through the pressure removal hole 3. The outer diameter portion of the flow channel housing 10 is reduced in diameter from the side (lower side in FIG. 1) to which the pressure releasing hole 3 in the axis C direction of the flow channel housing 10 is attached to the other side. A large diameter portion 10a, a medium diameter portion 10b, and a small diameter portion 10c are formed. That is, the flow path housing 10 abuts on the surface having the decompression hole 3 of the protected body 2 at the end face of the large diameter portion 10a. A flow path 11 that communicates with the protected body 2 through the pressure-removing hole 3 is formed in the inner shape portion of the flow path housing 10. A cross section perpendicular to the axis C of the flow path 11 is formed to be a circle having a constant diameter in the direction of the axis C of the flow path housing 10. In addition, the cross section perpendicular to the axis C of the decompression hole 3 is also circular and has the same diameter as the flow path 11. That is, the inner diameter of the flow path housing 10 and the diameter of the pressure release hole 3 are formed to be equal. In addition, the flow path housing 10 is provided with a first opening 40 on the other end face on the side where the decompression hole 3 in the direction of the axis C is attached, and the outer periphery of the cylindrical flow path housing 10 The 2nd opening part 50 is provided in the side surface used as a surface.

  Here, the first opening 40 is formed such that the center line thereof coincides with the axis C of the flow path housing 10, and the diameter thereof is formed to be smaller than the diameter of the flow path 11. . The second opening 50 is opened such that its center line is orthogonal to the axis C, and its diameter is smaller than the diameter of the first opening 40. The first opening 40 and the second opening 50 communicate with the depressurization hole 3 through the flow path 11 and communicate with the outside of the flow path housing 10.

  The cylinder 20 is formed in a multistage cylindrical shape (two stages in this embodiment). Both ends of the cylindrical body 20 in the direction of the axis C are open, and at one end of the cylinder 20, the axis 20 of the cylinder 20 coincides with the axis C of the channel casing 10. Mated and fixed. The outer diameter portion and the inner shape portion of the cylindrical body 20 are formed with a large diameter portion 20a and a small diameter portion 20b so that the diameter on the side where the decompression hole 3 in the direction of the axis C is attached becomes larger. Here, the large-diameter portion 20a of the cylindrical body 20 is fixed so that the end surface thereof is in contact with a surface facing the surface of the large-diameter portion 10a of the flow channel housing 10 that is in contact with the decompression hole 3. . The large diameter portion 20a of the cylindrical body 20 is fitted and fixed to the outer surface of the medium diameter portion 10b of the flow path housing 10 on the inner surface thereof. An opening portion having a diameter larger than that of the second opening 50 is provided at a position corresponding to the second opening 50 provided in the flow path housing 10 in the large-diameter portion 20 a of the cylindrical body 20.

The moving member 30 is disposed inside the cylindrical body 20 and is disposed so as to close the first opening 40.
The moving member 30 is formed in a multi-stage columnar shape (in this embodiment, two stages), and comes into contact with the flow path housing 10 around the first opening 40 so as to close the first opening 40. The central axis of the moving member 30 coincides with the axis C of the flow path housing 10. The moving member 30 is formed with a large-diameter portion 30a and a small-diameter portion 30b so that the diameter on the side in contact with the flow path housing 10 in the axis C direction is increased. Further, the large diameter portion 30 a of the moving member 30 is formed larger than the outer diameter of the small diameter portion 10 c of the flow path housing 10. An annular restricting portion 31 that protrudes in the direction of the axis C is formed on the peripheral portion of the contact surface 32 that contacts the flow path housing 10 in the moving member 30 and closes the first opening 40. The restricting portion 31 is formed so as to be disposed in the gap between the large diameter portion 20 a of the cylindrical body 20 and the small diameter portion 10 c of the flow path housing 10. Here, for example, a seal member 100 such as an O-ring is provided between the restricting portion 31 and the small-diameter portion 10 c of the flow path housing 10.

  The shaft member 60 is formed in a columnar shape, and is arranged so that the axis of the shaft member 60 coincides with the axis C of the moving member 30 and the flow path housing 10. Here, the shaft member 60 is fixed at one end in the direction of the axis C in a surface facing the contact surface 32 of the moving member 30 with the flow path housing 10 in the direction of the axis C. The shaft member 60 is supported on the cylinder body by support members 70 and 71 fixed to the other end portion of the cylindrical body 20 in the vicinity of the other end in the axis C direction. The support members 70 and 71 are arranged so as to overlap in the direction of the axis C, are disk-shaped members, and have external threads on the outer peripheral surface. On the other hand, a female screw is formed on the inner peripheral surface of the other end portion of the cylindrical body 20. And the supporting members 70 and 71 are being fixed to the other end part of the cylinder 20 because the external thread of the outer peripheral surface is screwed together with the internal thread of the cylinder 20. Further, through holes 72 are formed in the support members 70 and 71 so as to be centered on the axis C. The shaft member 60 protrudes outside the cylindrical body 20 so as to penetrate the through hole 72. At the end of the shaft member 60 that is supported by the support members 70 and 71 in the direction of the axis C, the end of the shaft member that protrudes outside the cylindrical body 20 has a circular circular cross section of the shaft member 60 in the horizontal direction. A head 61 having a diameter larger than the diameter of is provided.

  Here, annular bearing members 90 and 91 are provided between the moving member 30 and the cylindrical body 20 and between the shaft member 60 and the support member 70, respectively. The bearing members 90 and 91 are made of a material having a small friction coefficient, and the moving member 30 is supported by the bearing member 90 so as to be movable in the direction of the axis C. Similarly, the shaft member 60 is supported by the bearing member 91 so as to be movable in the axis C direction. Further, the moving member 30 and the shaft member 60 are supported by a bearing material 90 in a direction parallel to the axis C direction. Further, these bearing materials 90 and 91 have a sealing function and seal both sides thereof.

  Here, the outer diameter of the large-diameter portion 30 a of the moving member 30 is substantially equal to the inner diameter of the large-diameter portion 20 a of the cylindrical body 20 and is smaller than the small-diameter portion 20 b of the cylindrical body 20. Further, the outer diameter of the small diameter portion 30 b of the moving member 30 is formed smaller than the inner diameter of the small diameter portion 20 b of the cylindrical body 20. Thereby, the moving member 30 does not move beyond the small diameter portion 30b of the cylindrical body 20 in the axis C direction.

  The urging member 80 is a coiled spring that is externally mounted on the shaft member 60 inside the cylindrical body 20, and is arranged on the urging member 80 to urge the moving member 30 in a direction to close the first opening 40. Is disposed along the shaft member 60 on the side facing the surface in contact with the first opening 40 in the axis C direction.

  A valve body 51 is provided on the outer peripheral surface in the vicinity of the second opening 50 in the flow path housing 10 so as to close the second opening 50. The valve body 51 is rotatably supported by the flow path housing 10 by a hinge 52 on the side opposite to the axis C direction with respect to the side on which the moving member 30 is disposed. It is in contact with the restricting portion 31 on the outer surface. For this reason, the valve body 51 is regulated by the regulation unit 31 so as not to rotate and open the second opening 50 from a state in which the second opening 50 is closed.

Next, the operation of the decompression device 1 will be described.
FIG. 1 shows the valve closing state of the decompression device 1. The moving member 30 is in contact with the first opening 40, and the fluid inside the protected body 2 that has flowed into the flow path 11 from the decompression hole 3 is sealed in the flow path 11. In this state, the pressure inside the protected body 2 has a value smaller than the urging force that urges the urging member 80 in the direction to close the first opening 40 by the urging member 80. Reference numeral 30 denotes a state in which the first opening 40 is closed. In addition, the restricting portion 31 of the moving member 30 restricts the valve body 51 and keeps the second opening 50 closed.

When the pressure inside the protected body 2 exceeds the urging force by the urging member 80, the moving member 30 resists the urging force and moves along the shaft member 60 in the direction of the axis C as shown in FIG. The first opening 40 is opened. Thereby, the fluid flows out from the first opening 40 to the outside of the flow path housing. The fluid that has flowed out from the first opening 40 is sealed by the seal member 100 so as not to flow out from the space formed by the moving member 30 and the end surface of the flow path housing 10 to the outside of the moving member 30. When the pressure inside the protected body increases, the moving member 30 moves in a direction away from the first opening 40 to a position that balances with the urging force of the urging member 80 according to the pressure. The second opening 50 is closed by the valve body 51 and the fluid is sealed in the valve body 51 until the pressure inside the protected body 2 reaches a predetermined value. On the other hand, when the pressure inside the protected body 2 becomes a predetermined value or more, the restricting portion 31 provided on the moving member 30 moves to a position exceeding the height of the valve body 51. Thereby, the valve body 51 rotates around the hinge by the pressure from the inside of the flow path housing 10, and the second opening 50 is opened. Thereby, the fluid flows out to the outside through the second opening 50, and the pressure inside the protected body 2 decreases.
Here, the valve body 51 is disposed so as to rotate until it exceeds the axis of the second opening 50 that is substantially orthogonal to the direction of the axis C of the flow path housing 10. A part is not completely blocked by the valve body 51 and is completely opened.

  When the pressure inside the protected body 2 applied to the moving member 30 through the first opening 40 becomes lower than the urging force of the urging member 80 due to a decrease in the pressure inside the protected body 2, FIG. As shown in (b), the moving member 30 is moved again in the direction of closing the first opening 40 by the urging force of the urging member 80. Thereafter, the surface of the flow path housing 10 contacts the surface having the first opening 40, and the first opening 40 returns to the closed state. At this time, since the restriction of the restriction portion 31 of the moving member 30 has already been released and the valve body 51 remains in the separated position, the second opening portion 50 is not returned to the closed state, and the second opening 50 is not closed. The opening 50 is kept open.

  As described above, in the decompression device 1 of the present embodiment, as the internal pressure of the protected body 2 increases, once the second opening 50 is opened by the valve body 51, the internal pressure thereafter decreases. Even when the moving member 30 is moved again by the biasing force of the biasing member 80 and the first opening 40 is closed, the second opening 50 is opened without returning the valve body 51 to the original position. Kept in a state. Since the valve body 51 has irreversibility in this way, even if the pressure of the protected body 2 increases again, the pressure is always released from the second opening 50 and the moving member 30 does not move. Generation of chattering can be prevented. Further, it is possible to prevent fatigue failure of the biasing member 80 and the flow path housing 10 due to repeated high pressure applied to the decompression device 1. In addition, since the internal pressure of the protected body 2 continuously decreases and does not return to the closed state, it becomes easy to find an abnormal state in which the internal pressure of the protected body 2 continues to decrease.

  The biasing member 80 may be an elastic member such as a spring. It is conceivable to use a rupture disk as a valve having irreversibility so that the opening is not closed after being opened once. However, since the rupturable plate utilizes the fact that the plate material made of metal or the like is destroyed by pressure, there is a possibility that the blowing pressure, which is the pressure when the valve body 51 operates, may vary. By using the valve body 51 using a spring or the like, the urging force can be determined with high accuracy, and the blowout pressure can be set with high accuracy, so that the pressure relief device 1 with high accuracy can be provided. .

  The valve body 51 may be a metal plate such as an iron plate, and at least the surface facing the second opening 50 is covered with an elastic member such as rubber. Thereby, when the pan 51 is in the state of closing the second opening 50, the outflow of fluid from the inside of the flow path housing 10 can be reliably sealed, and the accuracy of the decompression device Can be increased. In this case, the entire plate may be covered with an elastic member.

Next, the decompression apparatus 200 of 2nd Embodiment is demonstrated using FIG. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The same applies to the following embodiments.
In the decompression device 200 according to the present embodiment, as shown in FIG. 3, a plurality of second openings 50 are provided so as to be equiangular around an axis parallel to the direction in which the moving member 30 moves. . In the present embodiment, as shown in FIG. 4, the second openings 50 are provided at two positions with an interval of 180 ° around an axis parallel to the direction in which the moving member 30 moves. Correspondingly, the valve body 51 is also provided at two locations.

  The operation of the second embodiment will be described. The pressure inside the protected body 2 is less than the urging force of the urging member 80, and the moving member 30 is provided outside the second opening 50 before the moving member 30 starts moving. The pressure inside the protected body 2 acts in the horizontal direction from the inside to the outside of the decompression device 1 through the valve body 51. In the present embodiment, the plurality of second openings 50 are provided at equiangular angles around the axis parallel to the direction in which the moving member 30 moves, so that the pressures acting on the moving member 30 cancel each other. For this reason, the biasing pressure acts on the moving member 30 so that the shaft member 60 and the moving member 30 are not inclined with respect to the axis C, so that the moving member 30 and the shaft member 60 are connected to the support member 70 and the flow channel housing. 10 and can be moved smoothly along the axis C.

  In the present embodiment, as shown in FIG. 5, the second opening 50 and the valve body 51 are spaced at three positions around the axis parallel to the direction in which the moving member 30 moves, at 120 °. It may be provided. Alternatively, the second opening 50 and the valve body 51 may be provided at four locations with an interval of 90 ° around an axis parallel to the direction in which the moving member 30 moves. By providing a plurality of equiangular angles at least around the axis, the same effect can be obtained.

  The plurality of openings 20c provided in the cylindrical body 20 can be closed with a lid or the like, leaving at least one. This facilitates the discharge processing of the released gas and the installation of a horn.

  Next, the decompression apparatus 300 of 3rd Embodiment is demonstrated using FIG.6 and FIG.7. In the decompression device 1 according to the present embodiment, as shown in FIGS. 6 and 7, the auxiliary member 110 formed in an annular shape so as to surround an axis line parallel to the moving direction of the moving body in the flow path housing 10. Prepare. The auxiliary member 110 is disposed so as to be movable in the axial direction parallel to the moving direction of the moving body along the outer peripheral surface of the medium diameter portion 10 b of the flow path housing 10. The dimension in the height direction of the auxiliary member 110 is formed to be equal to the dimension in the direction of the center line C of the middle diameter portion 10 b of the flow path housing 10.

  The operation of the third embodiment will be described with reference to FIG. FIG. 8A shows that the internal pressure of the protected body 2 increases, the urging member 80 exceeds the urging force applied to the moving member 30, and the moving member 30 starts moving along the shaft member 60. The restricting portion 31 is removed from the valve body 51, and the valve body 51 is operated by the pressure from the inside, and the second opening 50 is opened. Here, by causing the auxiliary member 110 to advance toward the valve body 51 side in the direction of the axis C along the small diameter portion 10 c of the flow path housing 10, a force acts on the valve body 51 from the auxiliary member 110. To do. This force is converted into a force that moves the valve body 51 in the direction of closing the second opening 50 by the hinge. As a result, as shown in FIG. 8B, the valve body 51 that has once moved in the direction of opening the second opening 50 is moved again in the direction of closing the second opening 50. After the valve body 51 closes the second opening 50, the auxiliary member 110 moves along the small diameter portion 10c of the flow channel housing 10 toward the medium diameter portion 10b of the flow channel housing 10 in the axis C direction. And is again placed in its original position.

  That is, by arranging the annular auxiliary member 110 along the middle diameter portion 10 b of the flow path housing 10, a plurality of second openings 50 and valve bodies 51 are provided, and the plurality of valve bodies 51 are second. When moving in the direction of opening the opening 50, a plurality of valve bodies 51 can be moved at a time. Thereby, the plurality of second openings 50 can be closed at a time, and the manual closing operation of the plurality of second openings 50 can be made efficient.

  The auxiliary member 110 is moved manually or by a machine.

  Next, the depressurization apparatus 400 of 4th Embodiment is demonstrated using FIG. In the present embodiment, the lever 120 is provided in the vicinity of the other end of the shaft member 60 on the side fixed to the moving member 30 in the axis C direction. The lever 120 is disposed outside the cylinder body and extends in a direction intersecting the axial direction of the shaft member 60. The lever 120 is rotatably provided on the shaft member 60 by a rotation shaft 121. Further, one end of the lever 120 is extended from the rotating shaft 121 to one side so that the operator can grip. On the other hand, the other end of the lever 120 extends from the rotating shaft 121 to the other side, and can contact the support member 70.

  The operation of the fourth embodiment will be described. The other end of the lever 120 comes into contact with the support member 70 by gripping one end and rotating the lever 120 around the rotation axis. When the lever 120 is further rotated from this state, the other end abuts on the support member 70 and the movement is restricted, so that the shaft member 60 connected to the lever 120 by the rotation shaft 121 moves in the axial direction. Become. Along with this, the moving member 30 can also be moved in the same direction. As a result, the moving member 30 can be moved by an arbitrary amount at an arbitrary time even if the pressure inside the protected body 2 does not increase. For this reason, the first opening 40 and the second opening 50 can be opened instantly in an emergency. Further, in order to close the second opening 50 once opened by the valve body 51 manually or by the auxiliary member 110, it is necessary to move the moving member 30 in the direction in which the first opening 40 is opened. At this time, the moving member 30 can be manually moved easily by the lever 120, and the work of closing the second opening 50 once opened by the valve body 51 can be efficiently performed.

  Next, a decompression device 500 according to a fifth embodiment will be described with reference to FIGS. 10 and 11. The decompression device 500 of the present embodiment includes a cam mechanism 130 that moves the moving member 30 in a direction to open the first opening by rotating the shaft member 60 and the moving member 30 about the axis C. The cam mechanism 130 is formed at the peripheral edge of the first opening 40 of the flow channel housing 10 and is inclined along the axis C so as to be inclined along the axis C in the direction of opening the first opening 40. And an abutting portion 130b that projects from the moving member 30 and abuts against the inclined surface.

  The operation of the fifth embodiment will be described. In the decompression device of the present embodiment, the moving member 30 can be rotated by rotating the shaft member 60 by means such as a spanner (wrench) or manual operation, and the moving mechanism 30 is moved in the direction of the axis C by the cam mechanism 130. It is possible to move to. For this reason, it is not necessary to provide the lever 120 to move the moving member 30, and the work of closing the second opening 50 once opened by the valve body 51 can be performed efficiently. In addition, when an excessive manual operation is performed in an emergency, it is possible to prevent the decompression device 1 from being deformed or damaged due to the lever 120 and the decompression device 1 being in strong contact. Further, when the moving member 30 is repeatedly moved by the lever, the moving member 30 and the shaft member 60 are inclined with respect to the direction of the axis C, and a gap is generated between the flow path housing and the moving member, so that the fluid flows out. there's a possibility that. On the other hand, in the present embodiment, since the moving member 30 can be moved in parallel with the direction of the axis C, a gap that causes the outflow of fluid occurs between the flow path housing and the moving member even if repeated operations are performed. It becomes possible to prevent this.

  In the present embodiment, the head 61 of the shaft member 60 preferably has a hexagonal cross section in the horizontal direction. Thereby, the moving member 30 can be easily moved using a spanner. As the head 61, a handle that can apply a rotational force around the axis C to the moving member 30 and the shaft member 60 may be used.

  As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the concrete structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.

DESCRIPTION OF SYMBOLS 1 Depressurization apparatus 2 Protected body 3 Decompression hole 10 Flow path housing | casing 30 Moving member 31 Control part 40 1st opening part 50 2nd opening part 51 Valve body 80 Energizing member 110 Auxiliary member 120 Lever 130 Cam mechanism

Claims (7)

A depressurization device that is attached to a depressurization hole formed so as to communicate with the inside of a protected body in which pressure is generated,
A flow path housing provided with a first opening and a second opening communicating with the outside and communicating with the outside,
A movable member provided so as to be able to close the first opening of the flow path housing and movable by pressure inside the protected body acting from the first opening;
A biasing member that biases the moving member in a direction to close the first opening;
A pressure relief device comprising: a valve body that closes the second opening and opens the second opening when the moving member moves by a predetermined amount. The decompression device according to claim 1,
The moving member restricts the valve body from being closed from the state in which the second opening is closed while the first opening is closed, and when the moving member has moved by the predetermined amount A depressurizing device having a restricting portion for releasing restriction on the valve body. The decompression device according to claim 1 or 2,
A plurality of the second openings are provided so as to be equiangular around an axis parallel to a direction in which the moving member moves. The decompression device according to claim 3,
An auxiliary member that is formed in an annular shape so as to surround the axis, and is movable toward the valve body along the axis so as to close the second opening. A depressurization device comprising: The decompression device according to any one of claims 1 to 4,
A depressurizing device comprising manual opening means for manually moving the moving member to open the valve body. The depressurization device according to claim 5,
The movement release means extends substantially horizontally with the axial direction of the shaft member at the distal end portion of the shaft member connected to the moving member, and is provided to be rotatable around the rotation axis, and is rotated in one direction. A depressurization device comprising a lever that moves the moving member in a direction to open the first opening. The depressurization device according to claim 5,
The pressure release device, wherein the manual release means includes a cam mechanism that moves the moving member in a direction to open the rotating member by rotating the moving member around the axis.

Images