JP4192141B2 - Gas shut-off valve - Google Patents

Description

  The present invention relates to a gas shut-off valve that has a movable iron core that is displaced under the excitation action of a coil and switches the communication state of gas flowing through a fluid passage.

  The present applicant has proposed a shut-off valve that is connected to a fluid passage and switches the communication state of a fluid such as a gas flowing through the fluid passage under the excitation action of a solenoid (see Patent Document 1). In this shut-off valve, a fixed iron core is fixed to a housing, and a plunger is provided coaxially with the fixed iron core and displaced toward the fixed iron core under the exciting action of a solenoid portion. A valve body is connected to one end of the plunger, and the valve body is closed by the seating of the valve body on the valve seat of the body by the spring force of the spring member.

  The valve body includes a first valve that is displaceably held at a lower end portion of a plunger and can be seated on a first valve seat, and a second valve that can be seated on a second valve seat of the body, Is clamped to the plunger via a substantially C-shaped clip, whereby the valve body is held at the lower end of the plunger.

  First, when the first valve is separated from the first valve seat provided in the plunger, fluid is led out to the port through the first valve, and then the second valve is moved to the second valve. By separating from the two valve seats, a larger flow rate of fluid is led out to the port.

JP 2004-185831 A

  The present invention has been made in connection with the above proposal, and provides a gas shutoff valve capable of reliably and stably supplying gas to a valve chamber in which a first valve portion is held. For the purpose.

To achieve the above object, the present invention provides a valve body having an introduction port through which a gas is introduced, and a lead-out port through which the gas introduced from the introduction port is discharged,
A solenoid part provided inside the housing connected to the valve body, and having an exciting action by an electric current;
A movable member that is provided so as to face a fixed member disposed inside the solenoid part, and that is displaced along an axial direction under the excitation action of the solenoid part;
A first valve portion that is provided in a valve chamber formed inside the movable member and can be seated / separated from a first valve seat portion mounted in the valve chamber, and a second valve formed in the valve body. A second valve portion that can be seated and separated with respect to the valve seat portion; a communication passage that communicates the first valve portion and the second valve portion; and a valve body portion that is held by the movable member;
It is formed in a substantially C shape having an opening, has a communication groove that communicates with the opening and faces the first valve portion, and is engaged between the first valve portion and the second valve portion. A locking member for holding the first valve portion with respect to the movable member;
A plurality of guide portions that are provided inside the valve body so as to face the outer peripheral surface of the second valve portion, restrict the displacement of the second valve portion in the radial direction, and guide the displacement along the axial direction. When,
A fluid passage which is provided along the axial direction between the plurality of guide portions and communicates between the introduction port and the second valve seat portion;
It is characterized by providing.

According to this invention, the 1st valve part in a valve body part is hold | maintained in the valve chamber of a movable member via the latching member formed in a substantially C shape, and a 1st valve part and the said latching member are carried out to the said latching member. A communication groove that faces and communicates with the opening is formed. And the gas introduced into the inside of the valve body from the introduction port is passed through the communication groove to the inside of the valve chamber where the first valve portion and the first valve seat portion are provided. Rutotomoni is circulated, said a plurality of guide portions provided inside the valve body to regulate the displacement in the radial direction of the second valve portion in the axial direction is guided with.

Therefore, even when the valve body part is displaced in the radial direction or tilted when it is integrally displaced with the movable member, it depends on the displacement amount, the displacement direction, the inclination angle, etc. of the valve body part in the radial direction. Therefore, the gas introduced into the valve body can be reliably supplied from the opening of the locking member to the inside of the valve chamber through the communication groove. Further, since the plurality of guide portions can prevent the second valve portion from being displaced and inclined in the radial direction, the gas can be more reliably and stably circulated through the valve chamber through the locking member.

  Therefore, the flow of gas to the valve chamber does not stagnate, the desired flow rate is always stably flowed through the valve chamber, and the gas is discharged when the first valve portion is separated from the first valve seat portion. The valve chamber can be reliably circulated through the communication passage of the valve body.

  Further, by forming the communication groove in a substantially C shape corresponding to the shape of the locking member, gas can be circulated along the locking member through the communication groove. Accordingly, since the gas can be supplied substantially evenly along the circumferential direction of the first valve portion, the gas can be supplied to the valve chamber more reliably.

  Furthermore, it is preferable that the compressed natural gas can be circulated more stably by using the compressed natural gas as the gas introduced / derived from the valve body.

  Furthermore, it is preferable that the gas introduced into and led out from the valve body is a fuel cell fuel gas made of hydrogen or oxygen, whereby the fuel cell fuel gas can be circulated more stably. .

  According to the present invention, the following effects can be obtained.

  That is, the first valve portion of the valve body portion is held by the movable member via a locking member formed in a substantially C shape, and is opposed to the first valve portion and communicates with the opening portion of the locking member. A valve chamber in which the first valve portion and the first valve seat portion are provided from the opening formed in the locking member to the gas introduced into the valve body through the communication groove by forming the communication groove. Can be circulated into the interior. Therefore, even when the valve body portion is displaced in the radial direction, the gas introduced into the valve body can be reliably and stably supplied to the valve chamber without being affected by the displacement.

  A gas shut-off valve for gas according to the present invention will be described in detail with reference to the accompanying drawings.

  In FIG. 1, reference numeral 10 indicates a gas shutoff valve according to an embodiment of the present invention.

  As shown in FIGS. 1 and 2, the gas shut-off valve 10 is, for example, an introduction port 12 through which a gas such as hydrogen or compressed natural gas (hereinafter simply referred to as a fluid) is introduced through a passage (not shown). And a valve body 16 having a lead-out port 14 through which the fluid is led to the outside, and a guide that is connected to an upper portion of the valve body 16 and in which a movable member 18 is provided to be displaceable along the axial direction. A body 20, a housing 24 connected to the upper portion of the guide body 20 via an end plate 22, a solenoid portion 26 disposed inside the housing 24, and a housing 24 are mounted so as to cover the outside. A cover member 28 and a valve body portion 32 for switching a fluid flow state by being seated on and separated from a valve seat portion (second valve seat portion) 30 of the valve body 16. Consisting of.

  The valve body 16 is made of a metal material (for example, aluminum), an introduction port 12 is formed so as to protrude from the side surface, and a lead-out port 14 is formed on the side surface opposite to the introduction port 12. In addition, a communication chamber 34 is formed inside the valve body so as to communicate with the introduction port 12 and in which the valve body portion 32 is provided to be displaceable in the axial direction (directions of arrows A and B). A first passage 36 is formed between the communication chamber 34 and the outlet port 14, and a second passage 38 is formed between the communication chamber 34 and the outlet port 14. A valve seat portion 30 is formed at a substantially central portion of the communication chamber 34 so as to protrude toward the valve body portion 32 and on which the valve body portion 32 is seated.

  The introduction port 12 is formed so as to be inclined upward by a predetermined angle from a state substantially orthogonal to the axis of the valve body 16, and a joint member to which piping or the like is connected at the end of the introduction port 12 (Not shown) is connected and communicates with the inside of the introduction port 12 through a passage formed in the joint member.

  A filter 40 having a substantially U-shaped cross section is mounted inside the first passage 36. That is, when dust or the like is contained in the fluid introduced from the introduction port 12, the dust or the like is removed by mounting the bottomed portion of the filter 40 formed in a mesh shape on the communication chamber 34 side. Thus, the dust and the like can be prevented from entering the communication chamber 34.

  On the other hand, the outlet port 14 is formed in the lower part of the communication chamber 34 and is inclined downward by a predetermined angle from a state substantially orthogonal to the axis of the valve body 16.

  The valve seat portion 30 is formed so as to protrude annularly by a predetermined length from the lower surface of the communication chamber 34 toward the valve body portion 32 side (in the direction of arrow A), and the second passage 38 and the second passage 38 through the substantially central portion thereof. Communicate.

  Inside the valve body 16, a guide portion 42 for guiding the valve body portion 32 is formed at a position facing the outer peripheral surface of a main valve portion (second valve portion) 128 (described later) in the valve body portion 32. Has been.

  As shown in FIG. 3, the guide portion 42 is formed so as to protrude radially inward from the inner peripheral surface of the valve body 16, and the inner peripheral diameter of the guide portion 42 is the outer periphery of the main valve portion 128. It is formed approximately equal to or slightly larger than the diameter. A plurality of (for example, six) guide portions 42 are provided along the inner peripheral surface of the valve body 16 so as to be spaced apart at equal angles. When the main valve portion 128 of the valve body portion 32 is guided by the guide portion 42, a fluid passage 44 surrounded by a pair of adjacent guide portions 42 and the outer peripheral surface of the main valve portion 128 is formed. It is formed along the axial direction.

  That is, as shown in FIG. 2, the fluid passage 44 includes a communication chamber 34 of the valve body 16, a space 126 between the seating surface 46 of the valve body portion 32 facing the valve seat portion 30 and the valve body 16. Are always in communication. A plurality of fluid passages 44 are formed between the adjacent guide portions 42.

  The guide body 20 is formed of a metal material (for example, stainless steel), and is integrally connected to the upper portion of the valve body 16 as shown in FIG. The guide body 20 extends in a cylindrical shape along the axial direction at the upper portion of the guide body 20, and a cylindrical portion 48 inserted into a bobbin 80 described later, and a radially outward direction at the lower portion of the cylindrical portion 48. And a flange portion 50 that is mounted on an end portion of the valve body 16 and extends in a cylindrical shape from the flange portion 50 toward the valve body 16 side. The insertion portion 52 is provided, and a stopper portion 54 formed so as to protrude further toward the valve seat portion 30 than the insertion portion 52.

  The cylindrical portion 48 is formed in a thin plate cylindrical shape, and a guide hole 56 is formed in the cylindrical portion 48 to guide the movable member 18 so as to be displaceable along the axial direction. The cylindrical portion 48 is inserted so as to come into contact with an insertion hole 94 of the bobbin 80 and a through-hole 64 described later of the end plate 22, and the upper end portion of the cylindrical portion 48 is fixed by, for example, laser welding. 84 (described later).

  An annular seal member 60 is mounted in a space surrounded by the outer peripheral surface of the cylindrical portion 48, the insertion hole 58 of the housing 24 through which the cylindrical portion 48 is inserted, and the upper surface of the end plate 22. That is, the seal member 60 keeps the airtightness of the solenoid portion 26 inside.

  The insertion portion 52 is formed with a diameter larger than that of the cylindrical portion 48, and the insertion portion 52 is inserted into the valve body 16 and integrally connected to the valve body 16. At that time, since the seal member 62 is mounted on the outer peripheral surface of the insertion portion 52 via an annular groove, the seal member 62 comes into contact with the inner wall surface of the valve body 16, thereby The airtightness between the guide body 20 is maintained.

  The end plate 22 is formed in an annular shape from a magnetic metal material, and is integrally connected to an upper portion of the flange portion 50 in the guide body 20. A through hole 64 penetrating along the axial direction is formed in a substantially central portion of the end plate 22, and the cylindrical portion 48 of the guide body 20 is inserted therethrough.

  The housing 24 is formed by integral molding from a resin material and is connected to the upper portion of the end plate 22. A connector portion 66 connected to a power source (not shown) for supplying current to the solenoid portion 26 is provided on the side surface of the housing 24. The connector portion 66 is made of a metal so that one end portion is exposed inside. A terminal 68 made of a material is provided. The terminal 68 is connected to a bobbin 80 (described later) of the solenoid portion 26 through the inside of the housing 24. The terminal 68 is connected to the power supply via a lead wire (not shown).

  Further, an overhanging portion 70 is formed on the upper surface of the housing 24 so as to protrude radially inward, and a seal member 72 is mounted via an annular groove formed on the upper surface of the overhanging portion 70. The seal member 72 is sandwiched between the housing 24 and a cover member 28 described later, whereby the airtightness between the housing 24 and the cover member 28 is maintained.

  The cover member 28 is formed of a magnetic metal material and has a substantially U-shaped cross section, and is mounted so as to surround the housing 24 from above. A hole 74 is formed at a substantially central portion in the upper portion of the cover member 28, and a screw portion 76 provided on the upper surface of a fixing member 84 (described later) is inserted through the hole 74.

  The solenoid portion 26 is disposed so as to be surrounded by the inside of the housing 24, and a bobbin 80 having a coil 78 wound around an outer peripheral surface thereof, and a movable portion provided inside the bobbin 80 so as to be displaceable along the axial direction. The member 18 includes a fixed member 84 that is integrally connected to the upper portion of the housing 24 via a cap nut 82 and is disposed so as to face the movable member 18.

  The bobbin 80 is provided so as to come into contact with the inner peripheral surface of the housing 24, and first and second diameter-expanded portions 86, 88 that are radially expanded outward are formed at the upper end portion and the lower end portion, respectively. ing. The housing 24 is integrally formed with the coil 78 wound between the first enlarged diameter portion 86 and the second enlarged diameter portion 88.

  The first enlarged diameter portion 86 is provided so as to contact the lower surface side of the overhanging portion 70 of the housing 24, and the lower surface of the second enlarged diameter portion 88 is connected to the convex portion 92 of the housing 24 via the annular groove portion 90. Is engaged. That is, the bobbin 80 around which the coil 78 is wound is integrally engaged with the inside of the housing 24 so that the entire bobbin 80 is surrounded.

  Further, an insertion hole 94 penetrating along the axial direction is formed in a substantially central portion of the bobbin 80, and a fixing member 84 formed in a cylindrical shape by a magnetic metal material is inserted into the upper portion of the insertion hole 94. At the same time, the movable member 18 is inserted below the fixed member 84 via the cylindrical portion 48 of the guide body 20.

  After the screw portion 76 formed on the upper portion of the fixing member 84 is inserted into the hole portion 74 of the cover member 28, the washer 81 is inserted and the cap nut 82 is screwed, whereby the fixing member 84 is inserted. The housing 24 is integrally connected.

  A concave portion 96 is formed on the lower surface of the fixed member 84 and is recessed by a predetermined depth toward the upper side away from the movable member 18.

  The movable member 18 is formed of a metal material made of a magnetic material, and is formed so as to protrude toward the fixed member 84 side of the main body 98 and a substantially columnar main body 98 provided inside the cylindrical portion 48 so as to be displaceable. The projecting portion 100 and a holding portion 104 that is formed on the valve seat portion 30 side of the main body portion 98 and holds the pilot valve portion (first valve portion) 102 in the valve body portion 32.

  The protruding portion 100 is formed with a diameter smaller than that of the main body portion 98 and is inserted into the concave portion 96 of the fixed member 84 when the movable member 18 is displaced upward. In addition, the height along the axial direction of the projecting portion 100 is formed to be substantially equal to or slightly smaller than the depth along the axial direction of the concave portion 96.

  As shown in FIG. 2, the holding portion 104 is formed on the side of the valve seat 30 (in the direction of arrow B) so as to face the mounting hole 106 formed so as to be recessed toward the fixing member 84 side. A pilot valve chamber (valve chamber) 108 into which the pilot valve portion 102 of the valve body portion 32 is inserted in a radially outward direction, and the diameter of the pilot valve chamber 108 is increased radially outward from the pilot valve chamber 108, and the locking ring A locking hole 112 in which the (locking member) 110 is disposed is formed. A pilot valve seat (first valve seat portion) 114 made of an elastic material such as rubber is mounted in the mounting hole 106.

  Then, after the pilot valve portion 102 is inserted into the pilot valve chamber 108 and the locking ring 110 is inserted into the shaft portion 116 which is the lower portion of the pilot valve portion 102, the lower end portion of the holding portion 104 is radially inward. It is crimped on. As a result, the pilot valve portion 102 is held by the holding portion 104 because the pilot valve portion 102 is restricted from being displaced downward from the pilot valve chamber 108 by the locking ring 110 crimped to the holding portion 104. Has never been removed. The inner diameter of the pilot valve chamber 108 is slightly larger than the outer diameter of the pilot valve portion 102, and the pilot valve portion 102 is provided inside the pilot valve chamber 108 so as to be displaceable by a predetermined amount in the axial direction. Yes.

  As shown in FIGS. 4 and 5, the locking ring 110 is formed in a substantially C shape having an opening 118 cut out from a metal material such as stainless steel with a predetermined width, for example. The shaft 116 of the valve body 32 is inserted through the opening 118. The width of the opening 118 is formed substantially equal to the diameter of the shaft 116 in the valve body 32. A communication groove 120 that is recessed at a predetermined depth is formed on the surface of the locking ring 110 that faces the pilot valve portion 102. The communication groove 120 is formed in a substantially C shape corresponding to the shape of the locking ring 110. That is, the communication groove 120 extends along the shape of the locking ring 110, and each end communicates with the opening 118.

  Further, as shown in FIG. 2, the diameter of the communication groove 120 is formed to be approximately equal to or slightly larger than the outer diameter of the pilot valve portion 102 in the valve body portion 32. Thereby, even when the locking ring 110 and the pilot valve portion 102 come into contact with each other, the communication groove 120 is not covered by the end surface of the pilot valve portion 102.

  On the other hand, a spring receiving portion 122 protruding outward in the radial direction is formed on the outer peripheral surface of the holding portion 104, and a spring 124 is interposed between the spring receiving portion 122 and the flange portion 50 of the guide body 20. ing. The elastic force of the spring 124 urges the movable member 18 in the direction in which the movable member 18 is separated from the guide body 20 (arrow B direction). In other words, the spring 124 biases the valve body portion 32 held by the movable member 18 in the direction in which the valve seat portion 30 is seated on the valve seat portion 30 by its elastic force.

  The valve body portion 32 is formed of, for example, a metal material such as stainless steel, and the pilot valve portion 102 held by the holding portion 104 of the movable member 18, and the valve seat portion 30 of the valve body 16 from the pilot valve portion 102. A main valve portion 128 formed on the side, and a shaft portion 116 connecting the pilot valve portion 102 and the main valve portion 128.

  The pilot valve portion 102 is inserted into the pilot valve chamber 108 of the holding portion 104, and a pilot passage 130 penetrating along the axial direction is formed at a substantially central portion of the pilot valve portion 102. The pilot valve portion 102 is provided so as to be seated / separated with respect to the pilot valve seat 114 mounted on the holding portion 104 under the action of displacement along the axial direction, and the upper surface facing the pilot valve seat 114 has a substantially central position. It gradually inclines downward from the part toward the radial outward direction.

  The shaft portion 116 is formed with a diameter that is reduced radially inward from the pilot valve portion 102, and a communication passage 132 is formed in the shaft portion 116 along the axial direction. The communication passage 132 extends inside the main valve portion 128 and opens so as to face the second passage 38 of the valve body 16, and the communication passage 132 communicates with the pilot passage 130 of the pilot valve portion 102. Yes.

  Further, since the passage diameter of the communication passage 132 is formed larger than the passage diameter of the pilot passage 130, the flow rate can be suitably distributed without being reduced.

  The main valve portion 128 is formed to expand radially outward from the pilot valve portion 102, and is disposed inside the communication chamber 34 in the valve body 16, and the outer peripheral surface of the main valve portion 128 is the valve body 16. It is held by a guide portion 42 formed on the surface.

  A coating layer 134 is formed on the outer peripheral surface of the main valve portion 128 in order to reduce sliding resistance with the guide portion 42. For example, the coating layer 134 is formed with a predetermined thickness by coating a fluororesin. Note that the coating layer 134 may be similarly formed on the inner peripheral surface of the guide portion 42 in the valve body 16.

  A first seat portion 138 is mounted on a seating surface 46 that is a lower surface of the main valve portion 128 via an annular first mounting groove 136 that is recessed by a predetermined depth from the seating surface 46. On the other hand, the second seat portion 142 is mounted on the upper surface of the main valve portion 128 via an annular second mounting groove 140 that is recessed by a predetermined depth from the upper surface. The first and second sheet portions 138 and 142 are made of an elastic material (for example, rubber).

  The first seat portion 138 is mounted at a position where the main valve portion 128 contacts the valve seat portion 30 when the main valve portion 128 is displaced toward the valve seat portion 30 (in the direction of arrow B), and the second seat portion 142 is attached to the main valve portion. When the portion 128 is displaced toward the fixing member 84 (in the direction of arrow A), the portion 128 is mounted at a position where it abuts against the stopper portion 54 of the guide body 20.

  Further, the first and second mounting grooves 136 and 140 communicate with each other through a communication hole 144 formed in the valve body portion 32 along the axial direction. The first and second sheet portions 138 and 142 are integrally connected by a connecting portion 146 made of an elastic material loaded in the communication hole 144. That is, the first and second sheet portions 138 and 142 are formed by filling the first and second mounting grooves 136 and 140 with an elastic material and solidifying them. At this time, for example, by filling the first mounting groove 136 with the elastic material, the elastic material is also filled into the second mounting groove 140 through the communication hole 144, so that the first and second sheet portions 138, 142 are filled. Can be easily integrally molded and mounted easily and efficiently.

  The gas shut-off valve 10 according to the first embodiment of the present invention is basically configured as described above. Next, the operation and effects thereof will be described. 1 is in a non-excited state in which no current is supplied to the coil 78 of the solenoid part 26, the pilot valve part 102 of the valve body part 32 is seated on the pilot valve seat 114, and the main valve part 128 is The off state is shown in which the fluid is passed between the inlet port 12 and the outlet port 14 by sitting on the valve seat 30.

  First, in such an off state, by introducing a fluid from the introduction port 12, the fluid is introduced into the communication chamber 34 through the first passage 36. At that time, when the fluid passes through the filter 40 attached to the first passage 36, dust and the like contained in the fluid are surely removed by the filter 40, and dust and the like are inside the communication chamber 34. It is possible to prevent entry.

  A part of the fluid introduced into the communication chamber 34 passes between the seating surface 46 of the main valve portion 128 in the valve body portion 32 and the valve body 16 through the fluid passage 44 formed in the guide portion 42 of the valve body 16. It circulates in the space 126 between.

  Next, when the coil 78 is energized from a power source (not shown) through the terminal 68 of the connector portion 66, the coil 78 is excited, and magnetic flux is generated from the coil 78 to the main body portion of the movable member 18 under the exciting action of the coil 78. It is generated so that it goes to 98, returns to the coil 78 again, and goes around.

  Then, the movable member 18 is displaced toward the fixed member 84 side (in the direction of arrow A) against the elastic force of the spring 124 under the exciting action of the coil 78, and is attached to the holding portion 104 of the movable member 18. Further, the pilot valve seat 114 is separated from the end face of the pilot valve portion 102 (see FIG. 6). At that time, the movable member 18 is displaced along the axial direction by the amount of the clearance formed between the pilot valve portion 102 and the locking ring 110. In this case, the main valve portion 128 of the valve body portion 32 is in a state of being seated on the valve seat portion 30.

  As a result, the fluid introduced into the communication chamber 34 from the introduction port 12 passes through the opening 118 of the locking ring 110 locked to the holding portion 104 and the pilot valve chamber 102 and the outer peripheral surface of the pilot valve chamber 108. It circulates between the inner peripheral surface, circulates along the communication groove 120 from the opening 118 in the circumferential direction, and circulates between the pilot valve portion 102 and the pilot valve seat 114.

  As a result, the fluid is introduced into the valve body portion 32 from the pilot passage 130 formed in the pilot valve portion 102, and is circulated to the second passage 38 through the communication passage 132 formed in the shaft portion 116. Derived from the port 14 to the outside.

  At that time, since the pilot passage 130 has an orifice structure in which the passage diameter is smaller than the communication passage 132, the pilot valve portion 102 is separated from the pilot valve seat 114 and introduced into the communication chamber 34. The fluid inside flows through the pilot passage 130 to the second passage 38 and the outlet port 14, thereby reducing the pressure inside the pilot valve chamber 108 and the communication chamber 34. In contrast, the pressure of the fluid introduced into the space 126 between the seating surface 46 of the main valve portion 128 and the valve body 16 through the fluid passage 44 formed in the guide portion 42 does not decrease. That is, the pressure in the communication chamber 34 is lower than the pressure in the space 126.

  Therefore, a pressure difference is generated between the pressure in the communication chamber 34 and the pressure in the space 126, and the upward pressure is applied to the seating surface 46 of the main valve portion 128 due to this pressure difference. The pressing force applied to the portion 128 overcomes the resilience of the spring 124 and the valve body portion 32 is displaced toward the movable member 18 side (arrow A direction), so that the main valve portion 128 is moved from the valve seat portion 30. Separate. At that time, the second seat portion 142 provided in the main valve portion 128 abuts against the stopper portion 54 of the guide body 20, and the displacement along the axial direction of the valve body portion 32 is restricted.

  As a result, the fluid that has been introduced from the introduction port 12 into the communication chamber 34 flows from the communication chamber 34 through the fluid passage 44 to the second passage 38 and the outlet port 14 and is led to the outside (valve). Open state).

  Further, in order to stop the flow of the fluid in such an on state, the coil 78 is brought into a non-excited state by stopping the current that has been passed through the coil 78 from a power source (not shown), and the movable member 18. The displacement force toward the fixing member 84 that has been urged by the main body 98 is extinguished. Therefore, the movable member 18 is pressed toward the valve seat portion 30 (in the direction of arrow B) by the elastic force of the spring 124, and the main valve portion 128 of the valve body portion 32 is brought into contact with the valve seat portion 30 via the first seat portion 138. Sit down. Thereby, the communication state between the communication chamber 34 and the outlet port 14 is turned off. As a result, the derivation of the fluid introduced from the introduction port 12 from the derivation port 14 is stopped.

  As described above, in the gas shutoff valve 10 according to the first embodiment, when the valve body portion 32 is held by the holding portion 104 of the movable member 18, the communication groove 120 is formed on the side surface on the pilot valve portion 102 side. The formed locking ring 110 is inserted into the shaft portion 116, and the pilot valve portion 102 of the valve body portion 32 is integrally crimped to the holding portion 104. For this reason, the fluid introduced into the communication chamber 34 is substantially distributed throughout the vicinity of the outer peripheral surface of the pilot valve portion 102 via the communication groove 120 of the locking ring 110 provided at the lower portion of the pilot valve portion 102. Evenly supplied. Specifically, the fluid flows into the communication groove 120 through the opening 118 of the locking ring 110.

  For example, the shut-off valve according to the related art does not include any restricting means for restricting the displacement of the valve body in the radial direction, so that the valve body has a radius when the plunger is displaced upward along the axial direction. The second valve may be displaced with respect to the clip. In that case, the flow of the fluid flowing between the second valve and the second valve seat through the clip formed in a substantially C shape by the radial displacement and inclination of the second valve is hindered, There is a concern that the flow rate of fluid flowing to the port through the inside of the second valve becomes unstable.

  Even when such a valve body portion 32 is displaced integrally with the movable member 18 and the valve body portion 32 is displaced in the radial direction, or when the valve body portion 32 is inclined, the first embodiment is performed. In the gas shutoff valve 10 according to the embodiment, since the fluid is supplied to the vicinity of the outer peripheral surface of the pilot valve portion 102 through the communication groove 120 of the locking ring 110, the outer peripheral surface of the pilot valve portion 102, the pilot valve chamber 108, Can be reliably supplied to the pilot passage 130 of the pilot valve portion 102 through a gap formed between the two.

  That is, in the gas shut-off valve 10 according to the first embodiment, the radius of the valve body portion 32 even when the valve body portion 32 is displaced in the radial direction or when the valve body portion 32 is inclined. A fluid having a desired flow rate is always supplied to the pilot valve chamber 108 through the communication groove 120 of the locking ring 110 through the communication chamber 34 without depending on the amount of displacement in the direction, the displacement direction, the inclination angle, and the like. it can. In other words, since the fluid can be circulated in the circumferential direction via the communication groove 120 formed in the locking ring 110, the flow of the fluid to the pilot valve chamber 108 is not delayed, and the pilot valve chamber 108 A desired flow rate can be circulated stably.

  Further, by separating the pilot valve portion 102 from the pilot valve seat 114, the pressure in the communication chamber 34 in the valve body 16 and the pressure in the space 126 between the seating surface 46 of the main valve portion 128 and the valve body 16 are reduced. A pressure difference is generated between the valve body part 32 and the main valve part 128 of the valve body part 32 can be separated from the valve seat part 30 by using the pressure difference, thereby opening the valve. As a result, the solenoid portion 26 is replaced with the pilot valve seat 114 and the pilot valve portion 114 in comparison with the shut-off valve that opens and closes the valve body portion 32 by displacing the movable member 18 under the excitation action of the solenoid portion 26. Since it is sufficient to excite only when separating from 102, the amount of current applied to the coil 78 of the solenoid unit 26 can be reduced, and the solenoid unit 26 can be downsized.

  Furthermore, since it becomes possible to supply a stable flow rate to the pilot valve chamber 108 only by a simple operation of replacing the clip in the conventional shut-off valve with the locking ring 110, it is possible to improve performance at low cost. Is possible.

  Furthermore, as a means for ensuring a fluid flow path when the valve body portion 32 is displaced in the radial direction, the fluid is guided to the pilot valve chamber 108 with respect to the movable member 18 and the valve body portion 32. However, by forming the communication groove 120 in the locking ring 110, it is possible to cope with it simply and at low cost.

  Furthermore, the communication groove 120 of the locking ring 110 is formed on the side surface of the valve body portion 32 facing the pilot valve portion 102 so as to extend along the circumferential direction of the locking ring 110. Even when the pilot valve portion 102 is displaced in any radial direction, the fluid can be supplied to the pilot valve chamber 108 through the communication groove 120.

  Further, by providing a guide portion 42 for guiding the main valve portion 128 in the valve body portion 32 along the axial direction inside the valve body 16, the displacement of the valve body portion 32 in the radial direction is restricted. Can do. As a result, displacement and inclination of the valve body portion 32 in the radial direction can be prevented, so that fluid can be supplied more stably to the inside of the pilot valve chamber 108 through the locking ring 110. Become.

  Further, by forming a coating layer 134 having a predetermined thickness on the outer peripheral surface of the main valve portion 128 in the valve body portion 32, the outer periphery of the main valve portion 128 is displaced when the main valve portion 128 is displaced along the axial direction. The sliding resistance generated between the surface and the inner peripheral surface of the guide portion 42 can be reduced, and wear of the main valve portion 128 and the guide portion 42 on which the main valve portion 128 slides is prevented. Can do.

  Next, a gas shut-off valve 200 according to a second embodiment is shown in FIG. The same components as those in the gas shutoff valve 10 according to the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the gas shut-off valve 200 according to the second embodiment, an annular groove 206 is formed on the outer peripheral surface of the main valve portion 204 in the valve body portion 202, and the ring surrounds the outer peripheral surface via the annular groove 206. This is different from the gas cutoff valve 10 according to the first embodiment in that a body 208 (see FIG. 9) is provided.

  As shown in FIGS. 8 and 9, the ring body 208 is formed in a substantially C shape from a resin material, and an engagement portion 210 protruding radially inward is formed on the inner peripheral surface thereof. . Further, the outer peripheral diameter of the ring body 208 is formed to be substantially equal to or slightly smaller than the inner peripheral diameter of the guide portion 42 formed in the valve body 16. Then, the ring body 208 is mounted so as to cover the outer peripheral surface of the main valve portion 204, and the engagement portion 210 of the ring body 208 is engaged with the annular groove 206 of the main valve portion 204. The main valve unit 204 is integrally mounted. In addition, the height dimension of the ring body 208 is formed substantially the same as the height dimension of the main valve portion 204.

  By providing the ring body 208 on the outer peripheral surface of the main valve portion 204 in this way, when the valve body portion 202 is displaced along the axial direction integrally with the movable member 18, the valve body is interposed via the ring body 208. The sliding resistance generated between the portion 202 and the guide portion 42 can be reduced, and wear of the main valve portion 204 and the guide portion 42 on which the main valve portion 204 slides can be prevented.

It is a longitudinal cross-sectional view of the cutoff valve for gas which concerns on the 1st Embodiment of this invention. FIG. 2 is an enlarged longitudinal sectional view in the vicinity of a valve body portion of the gas shutoff valve in FIG. 1. FIG. 2 is a partially omitted cross-sectional view showing a main valve portion and a guide portion in the valve body portion of FIG. 1. It is a single-piece | unit perspective view of the locking ring of FIG. It is sectional drawing along the VV line of FIG. FIG. 3 is an enlarged longitudinal sectional view showing a state in which a movable member is displaced upward in the gas shut-off valve of FIG. 2 and a pilot valve portion is separated from a pilot valve seat. 7 is an enlarged longitudinal sectional view showing a state in which the valve body portion is displaced upward in the gas shut-off valve of FIG. 6 and the main valve portion of the valve body portion is separated from the valve seat portion of the valve body. FIG. 6 is an enlarged longitudinal sectional view in the vicinity of a valve body portion in a gas shutoff valve according to a second embodiment of the present invention. It is a disassembled perspective view which shows the state which removed the ring body from the valve body part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 200 ... Gas shut-off valve 12 ... Introducing port 14 ... Deriving port 16 ... Valve body 18 ... Movable member 20 ... Guide body 22 ... End plate 24 ... Housing 26 ... Solenoid part 28 ... Cover member 30 ... Valve seat part 32, 202 ... Valve body portion 34 ... Communication chamber 36 ... First passage 38 ... Second passage 42 ... Guide portion 44 ... Fluid passage 46 ... Seating surface 50 ... Flange portion 52 ... Insertion portion 54 ... Stopper portion 66 ... Connector portion 78 ... Coil 80 ... Bobbin 84 ... Fixing member 98 ... Main body part 102 ... Pilot valve part 104 ... Holding part 108 ... Pilot valve chamber 110 ... Locking ring 112 ... Locking hole 114 ... Pilot valve seat 118 ... Opening part 120 ... Communication groove 124 ... Spring 128, 204 ... main valve portion 130 ... pilot passage 132 ... communication passage 134 ... coating layer 206 ... annular groove 208 ... Ing body

Claims (4)

A valve body having an introduction port through which gas is introduced and a lead-out port through which the gas introduced from the introduction port is discharged;
A solenoid part provided inside the housing connected to the valve body, and having an exciting action by an electric current;
A movable member that is provided so as to face a fixed member disposed inside the solenoid part, and that is displaced along an axial direction under the excitation action of the solenoid part;
A first valve portion that is provided in a valve chamber formed inside the movable member and can be seated / separated from a first valve seat portion mounted in the valve chamber, and a second valve formed in the valve body. A second valve portion that can be seated and separated with respect to the valve seat portion; a communication passage that communicates the first valve portion and the second valve portion; and a valve body portion that is held by the movable member;
It is formed in a substantially C shape having an opening, has a communication groove that communicates with the opening and faces the first valve portion, and is engaged between the first valve portion and the second valve portion. A locking member for holding the first valve portion with respect to the movable member;
A plurality of guide portions that are provided inside the valve body so as to face the outer peripheral surface of the second valve portion, restrict the displacement of the second valve portion in the radial direction, and guide the displacement along the axial direction. When,
A fluid passage which is provided along the axial direction between the plurality of guide portions and communicates between the introduction port and the second valve seat portion;
A gas shut-off valve comprising: The gas shut-off valve according to claim 1,
The gas shut-off valve, wherein the communication groove is formed in a substantially C shape corresponding to the shape of the locking member. The gas shut-off valve according to claim 1,
A gas shut-off valve, wherein the gas introduced / derived into the valve body is compressed natural gas. The gas shut-off valve according to claim 1,
A gas shut-off valve characterized in that the gas introduced into and led out from the valve body is a fuel gas for a fuel cell made of hydrogen or oxygen.

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