JP2016191419A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure sufficient durability and to eliminate anxiety that a seal member wears out, in a valve device.SOLUTION: At a body 12 for constituting a valve device 10, a first flow passage 14 and a second flow passage 16, and a valve storage hole 18 which reaches an intersection part of both flow passages 14, 16 and in which a holder 26 and a valve body 36 are arranged are formed. A locking part 42 of the valve body 36 is inserted in a first inner hole 28 formed at the holder 26. A second inner hole 30 connected to the first inner hole 28 is formed in the holder 26. A first screw part 34 engraved on an inner wall of the second inner hole 30 is screwed into a second screw part 74 of an operation member 38 inserted in the second inner hole 30. The operation member 38 is locked to a locking part 42; therefore, the valve body 36 integrally advances/retreats according to the advancing/retreating operation of the operation member 38. Meanwhile, the valve body 36 does not rotate following the operation member 38 performing the rotation operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a valve device that is in a valve-closed state or a valve-opened state when a valve portion constituting a valve body is seated or separated from a valve seat provided in a flow path.

  For example, in a fuel cell vehicle, a fuel cell and a hydrogen storage container for supplying hydrogen to the anode of the fuel cell are mounted, and a flow path for discharging hydrogen derived from the hydrogen storage container to the outside is provided. Provided. Here, as described in Patent Document 1, a manual shut-off valve as a valve device is arranged in the flow path. This manual shut-off valve is opened and closed manually by the operator. Of course, when the valve is closed, the flow path is closed and the flow of hydrogen is blocked.

  A first screw portion and a second screw portion are formed on the body (housing) and the operation member (operation screw) constituting the manual shut-off valve, respectively. The second screw portion is screwed to the first screw portion. Therefore, when the second screw portion is screwed along the first screw portion, the operation member performs the rotation operation and the advance / retreat operation. The operation member follows such an operation, and the valve body (main valve body) connected to the operation member integrally rotates and advances and retracts. As a result, the tip of the valve body is seated or separated from the valve seat.

JP 2010-190296 A

  In the manual shut-off valve, the operating member and the valve body are connected via a plastic deformation portion, and the base end surface of the valve body is in contact with the distal end surface of the operating member by surface contact. Therefore, in this case, when the pressure of the fluid acts on the valve body, the pressure is received by the operation member. For this reason, there is a possibility that the threads of the first screw portion and the second screw portion may be worn or worn. That is, with the above-described configuration, there is a concern that sufficient durability cannot be secured.

  Further, since the operation member and the valve body are connected by a plastically deformed portion, that is, a plastically deformed member, it is difficult to perform maintenance work and inspection work such as exchanging the valve body for some reason. . Furthermore, since it is necessary to prepare a new plastic deformation part when reconnecting an operation member and a valve body, cost rises.

  The present invention has been made to solve the above-described problems, and has an object to provide a valve device that can ensure sufficient durability with a simple configuration and can eliminate the concern that the seal member is worn. To do.

In order to achieve the above object, a valve device according to the present invention includes a body in which a flow path through which a fluid circulates and a valve accommodation hole extending from an outer wall thereof and reaching the flow path is formed.
A first inner hole that is housed in the valve housing hole and communicates with the valve housing hole, and is connected to the first inner hole and has a smaller diameter than the first inner hole, and a first screw is formed on the inner wall. A second inner hole provided with a portion, the first inner hole and the second inner hole extending along the valve accommodation hole,
At least a part of the outer wall is provided with a second screw portion that is screwed to the first screw portion, and the second screw portion is rotated along the first screw portion. And an operation member that performs an advancing and retreating operation that displaces the inside of the first inner hole,
A valve body having a locking portion that is locked to the operation member, and a valve portion that is seated on or separated from a valve seat provided in the flow path;
A seal member that seals between the body and the valve body;
Have
The valve body performs only an advance / retreat operation that is displaced integrally with the operation member when the operation member performs a rotation operation and an advance / retreat operation, and the valve portion is seated on the valve seat along with the advance / retreat operation. Or apart,
A step is formed in the holder by the first inner hole and the second inner hole,
The diameter of the locking portion is set larger than the diameter of the second inner hole,
When the valve is open, the locking portion abuts on the stepped portion,
Furthermore, the valve body is made of a material having a hardness higher than that of the operation member.

  In the present invention, since the valve body is locked to the operation member and the screw portions of the operation member and the holder are screwed together, the configuration is simplified. Moreover, there is no need to plastically deform any member when connecting the valve body to the operation member. Therefore, when the valve device is disassembled during maintenance work or inspection work, it is not necessary to prepare a new member when reassembling. For this reason, the cost required for replacement parts can be reduced.

  Moreover, according to said structure, when a valve apparatus is in a valve opening state, a latching | locking part contact | abuts to a step part. For this reason, when a high pressure fluid contacts a valve body and presses this valve body, pressing force acts on the contact surface of a latching | locking part and a step part. The pressing force is sufficiently transmitted from the contact surface to the holder. Accordingly, it is possible to avoid a pressing force from acting on the screw portions of the operation member and the holder. For this reason, since it is avoided that the thread of each screw part of an operation member and a holder generate | occur | produces and wears, durability of a valve apparatus can be ensured.

  Furthermore, as described above, in this valve device, even when the operating member performs a rotating operation, the valve body locked to the operating member does not follow and rotate. That is, the valve body only performs a relative forward / backward movement (straight forward movement) with respect to the seal member interposed between the valve body and the body. For this reason, since the load which acts on a sealing member reduces, it becomes difficult to wear a sealing member. In other words, the concern that the seal member is worn can be eliminated.

  In order to lock the valve body to the operation member, for example, the operation member is provided with a large-diameter portion and a small-diameter portion that is continuous with the large-diameter portion and has a smaller diameter than the large-diameter portion. A large-diameter portion insertion port for inserting the large-diameter portion and a small-diameter portion insertion port connected to the large-diameter portion insertion port and for inserting the small-diameter portion are formed in the locking portion. In this configuration, the small-diameter portion insertion port is a U-shaped groove whose width direction dimension is smaller than that of the large-diameter portion and larger than that of the small-diameter portion. The valve body is prevented from coming off from the insertion port and the small diameter portion insertion port.

  The valve body is preferably made of a material exhibiting hydrogen embrittlement resistance. This is because a valve device can be provided in the flow path through which high-pressure hydrogen flows. That is, in this configuration, since the valve body exhibits hydrogen embrittlement resistance, the penetration of hydrogen into the valve body is suppressed. Therefore, it is possible to prevent the valve body from being broken, white spots, swollen or the like due to the permeated hydrogen.

  Moreover, it is preferable that a valve body consists of a raw material with large tensile strength. A valve body made of such a material exhibits excellent pressure resistance. For this reason, when the valve body is pressed by the high-pressure fluid, the valve body can be prevented from being deformed, and the valve body can be prevented from being cracked. For the reasons described above, the durability of the valve body is further improved.

  According to the present invention, the valve body is locked to the operation member, and the valve device is configured by screwing the screw portions of the operation member and the holder together. And disassembly becomes easy. In addition, the cost required for replacement parts can be reduced.

  Further, when the valve device is in the valve open state, the locking portion of the valve body is brought into contact with the step portion of the holder, so that the pressing force of the high-pressure fluid is applied to the contact surface between the locking portion and the step portion. Is sufficiently transmitted to the holder. For this reason, since it is avoided that a pressing force acts on each screw part of an operation member and a holder, it is avoided that a thread and a wear generate | occur | produce on the thread of each screw part. Therefore, the durability of the valve device can be ensured.

  Furthermore, in the present invention, even when the operating member performs a rotating operation, the valve body locked to the operating member does not follow and rotate. As a result, since the load acting on the seal member is reduced, the concern that the seal member is worn can be eliminated.

It is a principal part schematic longitudinal cross-sectional view when the valve apparatus which concerns on embodiment of this invention is a valve closing state. It is a principal part schematic plan view which shows the engaging part with the latching | locking part which comprises a valve body, and an operation member. It is a principal part schematic longitudinal cross-sectional view when the valve apparatus shown in FIG. 1 is a valve opening state.

  Preferred embodiments of the valve device according to the present invention will now be described in detail with reference to the accompanying drawings. In the following, a case where the valve device is provided in a flow path for releasing hydrogen derived from the hydrogen storage container to the outside will be exemplified. That is, in this embodiment, hydrogen becomes a fluid.

  Further, “lower” and “upper” refer to the lower and upper sides in FIGS. 1 and 3, respectively. However, this is a convenient name for facilitating the understanding of the description with reference to the drawings, and does not specify the direction when the valve device is actually used.

  FIG. 1 is a schematic vertical sectional view of an essential part of the valve device 10 according to the present embodiment when the valve device 10 is in a closed state. In the valve device 10, the first flow path 14 and the second flow path 16 formed in the body 12 are communicated or blocked so that hydrogen is circulated or stopped.

  The first flow path 14 extends upward from below. On the other hand, the second flow path 16 connected to the first flow path 14 is bent from the first flow path 14 and extends in the horizontal direction. A hydrogen storage container (not shown) is connected to the upstream side of the first flow path 14, and the downstream side of the second flow path 16 is connected to a discharge path (not shown).

  The body 12 is formed with a valve accommodation hole 18 extending from the outer wall toward the intersection of the first flow path 14 and the second flow path 16. In other words, the valve accommodation hole 18 is a through hole that reaches the intersection of the first flow path 14 and the second flow path 16. The valve housing hole 18 is formed at the intersection of the large diameter hole 20 formed on the outer wall side of the body 12 and the first flow path 14 and the second flow path 16. And a small-diameter hole 22 having a small diameter. A positioning step 24 is formed on the bottom wall of the large-diameter hole 20 corresponding to the inner diameter difference between the large-diameter hole 20 and the small-diameter hole 22.

  A hollow cylindrical body-shaped holder 26 is inserted into the large-diameter hole 20. When the lower end surface of the holder 26 comes into contact with the positioning step portion 24 of the body 12, the holder 26 is dammed and positioned and fixed in the large-diameter hole 20.

  At the substantially central portion of the holder 26, a first inner hole 28 whose inner diameter is substantially equal to the inner diameter of the small diameter hole 22 of the valve housing hole 18, and a second inner hole having a smaller diameter than the first inner hole 28. 30 is formed. The first inner hole 28 and the second inner hole 30 extend along the valve housing hole 18. A stopper step 32 is formed on the ceiling wall of the first inner hole 28 corresponding to the inner diameter difference between the first inner hole 28 and the second inner hole 30.

  Further, a first screw portion 34 is engraved on the inner wall of the second inner hole 30. In addition, the screw part is not engraved on the inner wall of the first inner hole 28.

  A valve element 36 is accommodated in the small diameter hole 22. As will be described later, the valve body 36 is held by the holder 26 via the operation member 38.

  The valve body 36 is a single member integrally having the valve portion 40 and the locking portion 42. The material of the valve body 36 is preferably one that exhibits hydrogen embrittlement resistance and high tensile strength. An example of a suitable material having such characteristics is stainless steel for high pressure hydrogen.

  The valve portion 40 plays a role of closing the first flow path 14 by entering the first flow path 14. On the other hand, a locking port 56 is formed in the locking part 42 so as to cut out a part of the upper part from the side wall toward the inside.

  The locking port 56 is used for locking the operation member 38. The locking port 56 includes a large-diameter portion insertion port 64 and a small-diameter portion insertion port 66 that is linearly connected to the large-diameter portion insertion port 64 and narrower than the large-diameter portion insertion port 64. . Each of the large-diameter portion insertion port 64 and the small-diameter portion insertion port 66 is a U-shaped groove having a substantially U shape in plan view (see FIG. 2).

  The operation member 38 is set to be longer than the second inner hole 30 of the holder 26. The operation member 38 includes a large diameter portion 68, a small diameter portion 70 having a smaller diameter and a longer diameter than the large diameter portion 68, and an operation screw portion 72 having a diameter substantially equal to that of the large diameter portion 68. . The large-diameter portion 68 is inserted into the large-diameter portion insertion port 64 of the locking port 56 and the small-diameter portion 70 is inserted into the small-diameter portion insertion port 66, so that the operation member 38 is prevented from coming off from the locking port 56. Made. This is because the width direction dimension W1 of the small diameter portion insertion port 66 is smaller than the diameter D1 of the large diameter portion 68 as shown in FIG.

  The width direction dimension W1 of the small diameter portion insertion port 66 is set larger than the diameter D2 of the small diameter portion 70. For this reason, the small diameter part 70 can be easily inserted in the small diameter part insertion port 66.

  The height and width direction dimensions of the large diameter portion insertion port 64 are slightly larger than the height and diameter of the large diameter portion 68. Similarly, the width direction dimension W <b> 1 of the small diameter portion insertion port 66 is slightly larger than the diameter of the small diameter portion 70. That is, play is formed between the inner wall of the large-diameter portion insertion port 64 and the large-diameter portion 68 and between the inner wall of the small-diameter portion insertion port 66 and the small-diameter portion 70.

  As shown in FIG. 1, a second screw portion 74 is engraved on the side wall of the operation screw portion 72. The second screw portion 74 is screwed into the first screw portion 34 engraved on the inner wall of the second inner hole 30 of the holder 26. In addition, a hexagonal hole 76 is recessed in the upper end portion of the operation screw portion 72. The hexagon hole 76 is a bottomed hole for inserting a hexagon wrench or the like, for example.

  In the present embodiment, the operation member 38 is made of a material having a lower hardness than the valve body 36. Specifically, when the valve body 36 is made of stainless steel for high pressure hydrogen, a suitable example of the material of the operation member 38 is brass. Of course, the combination of the material of the valve body 36 and the operation member 38 is not limited to this.

  In the above configuration, the valve body 36 is formed with a circumferential groove 98 that circulates along the side wall. The circumferential groove 98 accommodates an O-ring 100 as a seal member.

  The valve device 10 according to the present embodiment is basically configured as described above. Next, the function and effect will be described.

  When assembling the valve device 10, first, the operation screw portion 72 of the operation member 38 is inserted from the first inner hole 28 side of the holder 26, and the operation screw portion 72 is further inserted into the second inner hole 30. By rotating the operation member 38 in this state, the second screw portion 74 of the operation screw portion 72 is screwed into the first screw portion 34 formed on the inner wall of the second inner hole 30. At this time, if the large diameter portion 68 and the small diameter portion 70 are exposed from the first inner hole 28, the locking operation of the valve body 36 described later becomes easy.

  Next, the large-diameter portion 68 and the small-diameter portion 70 of the operation member 38 protruding from the holder 26 are locked in the locking port 56 of the locking portion 42. By this locking, the valve body 36 is held by the holder 26 via the operation member 38.

  That is, the large diameter portion 68 is inserted into the large diameter portion insertion port 64 and the small diameter portion 70 is inserted into the small diameter portion insertion port 66. Since the locking port 56 (large diameter portion insertion port 64, small diameter portion insertion port 66) is a U-shaped groove, it is easy to lock the operation member 38 to the locking port 56.

  After rotating the operation member 38 to displace the valve body 36 to the holder 26 side to some extent, the holder 26 is inserted into the large diameter hole 20 of the valve accommodation hole 18. Since the outer diameter of the holder 26 is significantly larger than that of the small-diameter hole 22, the holder 26 is blocked by the positioning step portion 24. As a result, the holder 26 is positioned and fixed in the valve housing hole 18 to constitute the valve device 10.

  As described above, when configuring the valve device 10, the operation member 38 can be easily assembled to the holder 26 and the valve body 36 can be easily assembled to the operation member 38. Therefore, it is easy to disassemble the valve device 10, and it is also easy to perform a guard operation or an inspection operation.

  In addition, in the present embodiment, the operation member 38 and the valve body 36 are not connected by plastically deforming any member. For this reason, when reassembling after disassembling the valve device 10, it is not necessary to prepare a new member (plastic deformation portion). For this reason, the cost required for replacement parts can be reduced.

  In order to close the valve device 10, the operator inserts, for example, a hexagon wrench into the hexagon hole 76 formed in the operation member 38 and rotates the hexagon wrench clockwise. Since the second screw portion 74 of the operation screw portion 72 is screwed into the first screw portion 34 of the holder 26, the second screw portion 74 is screwed along the first screw portion 34. The operation member 38 rotates following this, and descends (displaces) toward the first flow path 14. Since the operating member 38 is locked to the locking portion 42 constituting the valve body 36, the valve body 36 is lowered (displaced) integrally with the operating member 38.

  Here, as described above, play is formed between the inner wall of the large-diameter portion insertion port 64 and the large-diameter portion 68 and between the inner wall of the small-diameter portion insertion port 66 and the small-diameter portion 70, respectively. Yes. For this reason, even when the operation member 38 is rotated, the valve element 36 is not driven to rotate. In other words, the large diameter portion 68 and the small diameter portion 70 of the operation member 38 idle in the large diameter portion insertion port 64 and the small diameter portion insertion port 66. That is, the valve body 36 is only displaced integrally with the operation member 38 and does not rotate.

  In other words, the O-ring 100 does not rotate relative to the body 12 but only performs a forward / backward movement (linear movement). For this reason, the load which acts on O-ring 100 is remarkably small. As a result, it is possible to avoid the O-ring 100 from being worn early.

  The lower end surface of the large-diameter portion 68 that rotates is in sliding contact with the bottom wall of the large-diameter portion insertion port 64. At this time, since the operating member 38 has a lower hardness than the locking portion 42 (the locking portion 42 has a higher hardness than the operating member 38), the gap between the operating member 38 and the locking portion 42 is low. It is possible to avoid so-called galling.

  When the valve portion 40 enters the first flow path 14 and the tapered side wall of the valve section 40 is seated on the valve seat, the communication between the first flow path 14 and the second flow path 16 is blocked. When this state is reached, it becomes extremely difficult to rotate the operation member 38. By recognizing this, the operator can determine that the first flow path 14 is closed by the valve portion 40 and the valve device 10 is in a closed state.

  When hydrogen is led out from the hydrogen storage container to operate the fuel cell, the hydrogen proceeds to the first flow path 14. As described above, since the communication between the first flow path 14 and the second flow path 16 is blocked by the first flow path 14 being blocked by the valve portion 40, hydrogen flows through the second flow path 16. There is nothing.

  At this time, the valve unit 40 is pressed with high-pressure hydrogen. Therefore, if the valve body 36 is made of a material excellent in hydrogen embrittlement resistance such as stainless steel for high-pressure hydrogen, the absorption of hydrogen into the valve portion 40 is suppressed. For this reason, it is possible to suppress the occurrence of breakage, white spots, blisters, etc. in the valve portion 40.

  In order to open the valve device 10, the operator inserts, for example, a hexagon wrench into the hexagon hole 76 formed in the operation member 38 and rotates the hexagon wrench counterclockwise. By this rotation, the second screw portion 74 is screwed along the first screw portion 34 so that the operation member 38 performs a rotation operation and rises (displaces) so as to be separated from the first flow path 14. At the same time, the valve body 36 rises (displaces) integrally with the operation member 38. As a result, as shown in FIG. 3, the valve portion 40 is separated from the valve seat, the valve device 10 is opened, and the first flow path 14 communicates with the second flow path 16 and hydrogen begins to flow.

  For the same reason as described above, the large-diameter portion 68 and the small-diameter portion 70 of the operation member 38 idle in the large-diameter portion insertion port 64 and the small-diameter portion insertion port 66, so that the valve body follows the rotational movement of the operation member 38. 36 does not rotate. That is, also in this case, the valve body 36 is only displaced integrally with the operation member 38 (performs forward / backward movement), and does not rotate following. As a result, premature wear of the O-ring 100 is avoided.

  When the valve body 36 continues to rise, the upper end surface of the locking portion 42 comes into contact with the stopper step portion 32 in the holder 26 as shown in FIG. When this state is reached, the operation member 38 cannot be rotated. By recognizing this, the operator can determine that the valve unit 40 has left the first flow path 14 and the valve device 10 has been opened.

  High-pressure hydrogen flows from the first flow path 14 to the second flow path 16. For this reason, the valve part 40 receives a press from hydrogen. Since the upper end surface of the locking portion 42 is in contact with the stopper step portion 32 in the holder 26, hydrogen pressing force acts on this contact surface. The pressing force is sufficiently transmitted from the contact surface to the holder. Therefore, it is avoided that the pressing force of hydrogen reaches the first screw portion 34 and the second screw portion 74. For this reason, it is avoided that the thread of the 1st screw part 34 or the 2nd screw part 74 generate | occur | produces and wears.

  In addition, when the valve body 36 is made of a material having a high tensile strength, the valve body 36 is prevented from being deformed or cracked even when it is pressed by high-pressure hydrogen. That is, the valve element 36 exhibits sufficient durability even under a situation where high-pressure hydrogen flows.

  For the above reasons, sufficient durability is ensured for the valve device 10. Eventually, by adopting the above configuration, the valve device 10 can exhibit excellent durability and sealing ability over a long period of time.

  In order to close the valve device 10, a hexagon wrench inserted into the hexagon hole 76 may be rotated clockwise as described above. As a result, the operating member 38 is rotated and lowered, and the valve body 36 is integrally lowered. Eventually, the valve portion 40 is seated on the valve seat (closes the first flow path 14), and the communication between the first flow path 14 and the second flow path 16 is blocked.

  The present invention is not particularly limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, instead of housing the O-ring 100 in the circumferential groove 98 formed in the valve body 36 (see FIGS. 1 and 3), a circumferential groove may be formed on the body 12 side to accommodate the O-ring. Good.

DESCRIPTION OF SYMBOLS 10 ... Valve apparatus 12 ... Body 14 ... 1st flow path 16 ... 2nd flow path 18 ... Valve accommodation hole 26 ... Holder 28 ... 1st internal hole 30 ... 2nd internal hole 32 ... Stopper step part 34 ... 1st screw part 36 ... Valve body 38 ... Operation member 40 ... Valve portion 42 ... Locking portion 56 ... Locking port 64 ... Large diameter portion insertion port 66 ... Small diameter portion insertion port 68 ... Large diameter portion 70 ... Small diameter portion 72 ... Operation screw portion 74 ... 2nd screw part 76 ... Hexagonal hole 98 ... Circumferential groove 100 ... O-ring

Claims (2)

A body formed with a flow path through which the fluid flows and a valve accommodation hole extending from the outer wall and reaching the flow path;
A first inner hole that is housed in the valve housing hole and communicates with the valve housing hole, and is connected to the first inner hole and has a smaller diameter than the first inner hole, and a first screw is formed on the inner wall. A second inner hole provided with a portion, the first inner hole and the second inner hole extending along the valve accommodation hole,
At least a part of the outer wall is provided with a second screw portion that is screwed to the first screw portion, and the second screw portion is rotated along the first screw portion. And an operation member that performs an advancing and retreating operation that displaces the inside of the first inner hole,
A valve body having a locking portion that is locked to the operation member, and a valve portion that is seated on or separated from a valve seat provided in the flow path;
A seal member that seals between the body and the valve body;
Have
The valve body performs only an advance / retreat operation that is displaced integrally with the operation member when the operation member performs a rotation operation and an advance / retreat operation, and the valve portion is seated on the valve seat along with the advance / retreat operation. Or apart,
A step is formed in the holder by the first inner hole and the second inner hole,
The diameter of the locking portion is set larger than the diameter of the second inner hole,
When the valve is open, the locking portion abuts on the stepped portion,
Furthermore, the valve body is made of a material having a hardness higher than that of the operation member. The valve device according to claim 1, wherein the operating member includes a large diameter portion, and a small diameter portion that is continuous with the large diameter portion and has a smaller diameter than the large diameter portion,
The locking portion is formed with a large-diameter portion insertion port into which the large-diameter portion is inserted, and a small-diameter portion insertion port connected to the large-diameter portion insertion port and into which the small-diameter portion is inserted,
The valve device characterized in that the small diameter portion insertion port is a U-shaped groove whose width direction dimension is smaller than the large diameter portion and larger than the small diameter portion.

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