JP2010019353A - Relief valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a relief valve small in the number of parts, and capable of carrying out precise pressure adjustment. <P>SOLUTION: The relief valve has a valve case forming an outline and having an internal space, a first passage opened to the internal space and communicating with a pressure generation source, a second passage opened to the internal space and relieving pressure, and a valve provided in the internal space and carrying out the communication or cutoff of the internal space and the first passage. The valve has a valve element and a plurality of legs extending from the valve element, the leg is formed of a spring material, and the valve is composed to cut off the internal space and the first passage when the pressure of the pressure generation source is a predetermined value or lower to make the internal space communicate with the first passage when the pressure of the pressure generation source is higher than the predetermined value, and to sequentially vary an opening area of the internal space and the first passage according to a degree of pressure higher than the predetermined value. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a relief valve, in particular, a relief valve for releasing the increased pressure when the pressure in a fuel tank of an automobile or the like increases.

  The fuel tank of an automobile or the like is provided with a relief valve at the top of the fuel tank when the pressure in the fuel tank rises, for example, when the pressure rises at the time of refueling or at a high temperature, etc., to release the increased pressure. Yes.

  FIG. 16 shows an example of a conventional relief valve. This relief valve 1 forms an outer shell from a valve case 2 and a cover 3 that covers the upper portion thereof, and has an internal space 4 inside. The valve case 2 has a first opening 5 that communicates with a pressure generation source such as a fuel tank by a pipe (not shown) and a second opening 6 that communicates with the atmosphere.

  In the internal space 4, the ball valve 7 abuts on the first opening 5, and the coil spring 8 is provided in a form that presses the ball valve 7 in the direction of the first opening 5. When the pressure of the pressure generating source such as the fuel tank becomes larger than a predetermined value, the pressure pushes up the ball valve 7 against the pressing force of the coil spring 8 as shown by the black arrow (1), and the pressure is larger than the predetermined value. Escapes to the atmosphere through the internal space 4 and the second opening 6 as indicated by black arrows (2) and (3).

  When the pressure larger than the predetermined value escapes to the atmosphere and the pressure of the pressure generating source such as the fuel tank falls below the predetermined value, the ball valve 7 blocks the first opening 5 by the pressing force of the coil spring 8. As a result, the pressure of the pressure generating source such as the fuel tank is adjusted to a predetermined value or less. In this case, when the pressure of the pressure generating source becomes larger than a predetermined value, the ball valve 7 sequentially changes the opening area of the first opening 5 in a proportional relationship, for example, according to the magnitude of the pressure larger than the predetermined value. Therefore, the pressure adjustment of the pressure source is performed more precisely.

  FIG. 17 shows an example of another conventional relief valve. This relief valve 11 forms an outer shell from a valve case 12 and a cover 13 covering the upper portion thereof, and has an internal space 14 inside. The valve case 12 has a first opening 15 communicating with a pressure generating source such as a fuel tank (not shown) and a second opening 16 communicating with the atmosphere.

  In the internal space 14, a spring plate valve 17 is provided in such a form as to abut against the second opening 16 and block the second opening 16. When the pressure of the pressure generating source such as the fuel tank becomes larger than a predetermined value, the pressure acts on the internal space 14 as shown by the black arrows (1) and (2), and pushes up the spring plate valve 17 upward. The spring plate valve 17 is a member having a so-called snap action function that reverses to the opposite side when the acting pressure becomes larger than a predetermined value, in other words, a function that opens and closes the second opening 16 on and off.

  Therefore, when the pressure acting on the spring leaf valve 17 becomes larger than a predetermined value, the spring leaf valve 17 is reversed to the opposite side, and the opening area with the second opening 16 is maximized. As a result, a pressure larger than a predetermined value of a pressure generation source such as a fuel tank escapes to the atmosphere through the internal space 14 and the second opening 16 as indicated by black arrows (2) and (3).

  When the pressure larger than the predetermined value escapes to the atmosphere at once, and the pressure of the pressure generating source such as the fuel tank suddenly falls below the predetermined value, the spring plate valve 17 is reversed again by the reaction force of the spring plate valve 17 itself, and the original shape Returning to FIG. In this case, the pressure adjustment of the pressure generation source is on / off control, which is rather rough (see, for example, Patent Document 1).

  The above-described relief valve is properly used according to the required adjustment. By the way, when performing a more precise adjustment, what was conventionally shown in FIG. 16 is used. However, since the valve shown in FIG. 16 is composed of two members, the ball valve 7 and the coil spring 8, the number of parts increases and the labor for arranging these two members becomes more complicated. It was a cause.

Further, the spring plate valve 17 of FIG. 17 has a characteristic that it is a single component, but has a drawback that a more precise pressure adjustment cannot be performed.
JP 2002-71037 A

  An object of the present invention is to provide a relief valve with a small number of parts and capable of more precise pressure adjustment.

  In order to achieve the above object, the present invention employs the following configuration.

  In the first aspect of the present invention, a valve case that forms an outer shell and has an internal space, a first passage that opens to the internal space and communicates with a pressure generating source, and a second passage that opens to the internal space and releases pressure A relief valve provided in the internal space and communicating or blocking the internal space and the first passage, wherein the valve includes a valve body and a plurality of leg portions extending from the valve body. The leg is formed of a spring material, and the valve shuts off the internal space and the first passage when the pressure of the pressure generation source is equal to or less than a predetermined value, and the pressure of the pressure generation source is A configuration in which the internal space and the first passage are communicated with each other when larger than a predetermined value, and an opening area of the internal space and the first passage is variable in accordance with a pressure larger than the predetermined value. With such a configuration, the valve is made up of a single part, reducing the number of parts and enabling more precise pressure adjustment.

  In the invention which concerns on Claim 2, the said leg part is the structure which inclines outward from the outer peripheral end of the said valve body. Such a configuration facilitates deformation of the valve and enables more precise pressure adjustment.

  In the invention which concerns on Claim 3, the said leg part curves outward from the outer peripheral end of the said valve body, and also is the structure which inclines and extends outward. In the invention which concerns on Claim 4, the said leg part is the structure which inclines outward from the outer peripheral end of the said valve body, and is further curved inward. With such a configuration, the valve is deformed at the curved portion and the inclined portion, the valve is more easily deformed, and more precise pressure adjustment is possible. The curved portion may have any curvature, such as an arc shape or a U shape.

  In the invention which concerns on Claim 5, the said leg part is the structure which inclines inwardly from the outer peripheral end of the said valve body. Such a configuration reduces the size of the valve in the radial direction, further facilitates deformation of the valve, and enables more precise pressure adjustment.

  In the invention which concerns on Claim 6, the said leg part is extended from the outer peripheral end of the said valve body to the orthogonal | vertical direction, and has a bellows-like unevenness | corrugation in the middle. Such a configuration reduces the size of the valve in the radial direction, further facilitates deformation of the valve, and enables more precise pressure adjustment.

  In the invention which concerns on Claim 7, the structure which has a bending part further in the outer end part of the said leg part. In the invention which concerns on Claim 8, the said bending part is a structure which is a horizontal protrusion part. In the invention which concerns on Claim 9, the said bending part is a structure which has an angle with respect to a horizontal surface. Such a configuration facilitates deformation of the valve and enables more precise pressure adjustment.

  In the invention which concerns on Claim 10, the said horizontal protrusion part is the structure extended outward from the outer end part of the said leg part. Such a configuration facilitates deformation of the valve and enables more precise pressure adjustment.

  In the invention which concerns on Claim 11, the said horizontal protrusion part is a structure extended inward from the outer-end part of the said leg part. Such a configuration reduces the size of the valve in the radial direction, further facilitates deformation of the valve, and enables more precise pressure adjustment.

  In the invention which concerns on Claim 12, the said valve | bulb is the structure by which the whole is integrally formed from a spring material. Such a configuration facilitates production.

  In the invention which concerns on Claim 13, the said valve body is the structure which has the 1st cyclic | annular protrusion which protrudes in the said 1st channel | path side. In the invention which concerns on Claim 14, it is the structure which has the 2nd cyclic | annular protrusion which protrudes in the said valve body side in the said valve case surface which the said valve body contacts. Such a configuration increases the closing force of the valve.

  In the invention which concerns on Claim 15, the said relief valve is a structure for fuel tanks. Such a configuration increases the reliability of the fuel tank.

  In the invention according to claim 1, the valve is formed from a valve body and a plurality of leg portions extending from the valve body, the leg portion is formed from a spring material, and the pressure of the pressure generating source is equal to or less than a predetermined value. Then, the internal space and the first passage are shut off, and when the pressure of the pressure generating source becomes larger than a predetermined value, the internal space and the first passage are communicated with each other, and the valve opening is opened according to the magnitude of the pressure larger than the predetermined value. By changing the area, the number of parts can be reduced, the valve can be easily assembled, and the production cost can be reduced. Further, the pressure adjustment of the valve can be made more precise. Note that the variable opening area of the valve may be variable proportionally or exponentially as long as it is not on / off control of the valve.

  In the invention according to claim 2, by extending the leg portion so as to be inclined outward from the outer peripheral end of the valve body, the valve can be deformed in accordance with the pressure, that is, the valve body can be moved vertically. Thus, more precise pressure adjustment can be performed.

  In the invention according to claim 3, the leg portion is curved outward from the outer peripheral end of the valve body and further inclined and extended outward. In the invention according to claim 4, the leg portion is extended to the outer peripheral end of the valve body. The valve can be deformed at the curved part and the inclined part by inclining and extending outward from the outer side, and further curved inward. Can be performed more satisfactorily, and more precise pressure adjustment can be performed.

  In the invention according to claim 5, by extending the leg portion inwardly from the outer peripheral end of the valve body, it is possible to reduce the size of the valve in the radial direction and to deform the valve in accordance with the pressure. That is, the valve body can be moved up and down satisfactorily and more precise pressure adjustment can be performed.

  In the invention which concerns on Claim 6, while extending a leg part to the orthogonal | vertical direction from the outer peripheral end of a valve body and forming a bellows-like unevenness in the middle, it can make the magnitude | size of the radial direction of a valve small. According to the pressure, the deformation of the valve, that is, the vertical movement of the valve body can be performed satisfactorily, and more precise pressure adjustment can be performed.

  In the invention according to claim 7, a bent portion is further formed at the outer end portion of the leg portion. In the invention according to claim 8, the bent portion is a horizontal protrusion, and in the invention according to claim 9, By forming the bent portion at a predetermined angle with respect to the horizontal plane, the bent portion or the horizontal protruding portion can be used to favorably perform the deformation of the valve, that is, the vertical movement of the valve body, More precise pressure adjustment can be performed.

  In the invention according to claim 10, by extending the horizontal protrusion outward from the outer end of the leg, the horizontal protrusion can satisfactorily deform the valve, that is, move the valve body up and down in response to the pressure. Thus, more precise pressure adjustment can be performed.

  In the invention which concerns on Claim 11, while extending | stretching a horizontal protrusion part inward from the outer end part of a leg part, the magnitude | size of the radial direction of a valve | bulb can be made small, and according to a pressure by a horizontal protrusion part. The deformation of the valve, that is, the vertical movement of the valve body can be performed satisfactorily, and more precise pressure adjustment can be performed.

  In the invention which concerns on Claim 12, by forming a valve | bulb integrally from a spring material, production becomes easy and the production cost of a valve | bulb can be reduced more.

  In the invention according to claim 13, by providing the valve body with a first annular protrusion protruding toward the first passage, and in the invention according to claim 14, on the valve body side on the valve case surface with which the valve body abuts. By providing the protruding second annular protrusion, it is possible to increase the closing force of each valve, further to uniformly open the entire circumference of the valve, and to further improve the reliability of the valve.

  In the invention according to claim 15, by using the relief valve for the fuel tank, in addition to the effects of the invention according to claims 1 to 14, the reliability of the fuel tank can be enhanced.

  FIG. 1 shows a sectional view of the relief valve before assembly, FIG. 2 shows a sectional view of the relief valve after assembly, FIG. 3 shows a plan view of the valve, and FIG. 4 shows a sectional view when the relief valve is opened. FIGS. 5 to 7 show other relief valves, and FIGS. 8 to 15 show other valves. The structure will be described.

  The relief valve 20 forms an outline from a valve case 21 and a cover member 22 that covers the upper opening of the valve case 21. The valve case 21 has an internal space 23. A first passage 24 communicating with a pressure generation source such as a fuel tank (not shown) is opened in the bottom wall 21a, and a first passage 24 communicating with the atmosphere is formed in the side wall 21b. Two passages 25 are opened, the pressure of a pressure generating source such as a fuel tank is transmitted to the internal space 23 through the first passage 24, and the atmosphere is introduced into the internal space 23 through the second passage 25.

  The valve case 21 and the cover member 22 are joined by appropriate means such as heat welding or adhesive. The valve case 21 and the cover member 22 may be collectively referred to as a valve case. The first passage 24 and the second passage 25 correspond to the first passage and the second passage in the claims.

  A plurality of valve support members 26 are erected on the bottom wall 21 a of the valve case 21. The valve support member 26 is a member that supports a later-described valve 30 and is formed integrally with or separately from the valve case 21. As shown in FIG. 3, a plurality of the valve support members 26 are provided on the bottom wall 21 a of the valve case 21 along the outer periphery of the valve body 30 a of the valve 30.

  The cross-sectional shape of the valve support member 26 is a shape along the outer periphery of the valve body 30a, and in this case, an arc shape. Further, the height of the valve support member 26 is set higher than the maximum opening height of the valve body 30 a so that the valve 30 does not shift in the valve case 21. By mounting the valve body 30a of the valve 30 in the valve support member 26, the arrangement of the valve 30 is completed.

  A valve 30 is arranged in the internal space 23 in a form of being mounted in the valve support member 26. The valve 30 is a spring-like member having one valve body 30a, a plurality of leg portions 30b, and a horizontal protrusion 30c that is also a plurality of bent portions. Generally, the spring-like member is formed of spring steel made of carbon steel or special steel, and is known to have a spring property.

  The valve body 30 a is a circular and flat member placed on the bottom wall 21 a of the internal space 23, and communicates or blocks the first passage 24 with respect to the internal space 23. The shape of the valve body 30a may be an ellipse, a rectangle, a polygon, or the like.

  The leg portion 30b is a plurality of members extending in an outward direction from the outer peripheral end of the valve body 30a, in this case, four members. In FIG. 1, a plurality of leg portions 30b are inclined and extended obliquely upward from the outer peripheral end of the valve body 30a. It is a member. And as shown in FIG. 3, the leg part 30b is a long and narrow rectangular shape in planar view, and is provided in the outer peripheral end of the valve body 30a at substantially equal intervals.

  The horizontal protrusion 30c is formed by bending the tip of the leg 30b horizontally for a predetermined length, and comes into surface contact with the inner bottom surface 22a of the cover member 22 after the relief valve 20 is assembled. The horizontal protrusion 30c may be omitted, but it is preferable that the tip of the leg 30b abuts on the inner bottom surface 22a of the cover member 22 at an angle, and the movement of the valve 30 becomes dull.

This valve 30 is formed by press-molding a spring-like member into the shape shown in FIG. 3, inclining the leg 30b to the shape shown in FIG. 1, and then bending the tip of the leg 30b horizontally. In addition, the valve body 30a, the leg part 30b, and the horizontal protrusion part 30c may be separate bodies. In the case of separate bodies, joint portions are formed and attached by means such as caulking or screws. In that case, at least the leg 30b is formed of a spring material.

  Next, assembly will be described. As shown in FIG. 1, the valve body 30 a of the valve 30 is turned down, and the valve body 30 a is mounted in the valve support member 26. Then, the horizontal protrusion 30c of the valve 30 protrudes from the upper end of the valve case 21 by a slight length S1 (because it is made in such a size in advance).

  Thereafter, the cover member 22 is covered and the valve case 21 and the cover member 22 are joined. Then, the valve 30 is pushed in the vertical direction by the length S1, and the horizontal projecting portion 30c slides away from the inner bottom surface 22a of the cover member 22, that is, outward, and reacts against the valve 30, particularly the leg portion 30b. Give rise to As a result, the valve body 30a is pressed against the bottom wall 21a with a predetermined force and blocks the first passage 24. The state is shown in FIG. As shown in FIG. 2, the tip of the horizontal protrusion 30 c has a maximum length S <b> 2 that can move between the side wall 21 b of the valve case 21 and a length longer than that.

  After the attachment, the pressure transmitted from a pressure generating source such as a fuel tank (not shown) acts on the lower surface of the valve body 30a as indicated by the black arrow (1). When the pressure is less than or equal to a predetermined value, the valve body 30a does not move up, but when it exceeds the predetermined value, the valve body 30a moves up and opens the first passage 24. This predetermined value is set according to the maximum allowable pressure of a pressure generating source such as a fuel tank.

  FIG. 4 shows a state in which the pressure transmitted from a pressure generating source such as a fuel tank becomes larger than a predetermined value and the valve body 30a is moved upward to open the first passage 24 to the maximum. The spring property of the valve 30 is set so that the opening area sequentially increases in accordance with the magnitude of pressure greater than a predetermined value. For example, the opening area increases in proportion to the pressure, or the pressure increases. Correspondingly, the opening area gradually increases in a quadratic curve. Therefore, the pressure generating source such as the fuel tank can be adjusted more precisely than that shown in FIG. The present invention achieves the intended purpose and effect with one valve by making the configuration of the valve 30 a special shape as described in the claims.

When the pressure of a pressure generating source such as a fuel tank becomes larger than a predetermined value, the pressure pushes up the valve body 30a against the spring force as shown by the black arrow (1), and the pressure larger than the predetermined value is increased by the black arrow ( 2) As shown in (3), escape to the atmosphere through the internal space 23 and the second passage 25. In that case, the horizontal protrusion 30c moves outward on the inner bottom surface 22a of the cover member 22, contacts the side wall 21b, and has a length S0 (zero). This position is the maximum opening position of the valve body 30a. The length S0 may not be zero.

  5 and 6 show a modification. In this example, the shape of the valve body 30a is different, and the other parts are the same as those in FIGS. In this example, the first annular protrusion 35 is provided slightly inward from the outer peripheral end of the valve body 30a.

  The first annular protrusion 35 has a circular arc shape protruding in the direction of the bottom wall 21a. When the valve body 30a is closed, the entire circumference of the tip of the first annular protrusion 35 abuts the bottom wall 21a substantially uniformly. As a result, the first annular protrusion 35 and the bottom wall 21a are closed well, the closing force between them is increased, and when the valve body 30a is opened, the pressure escapes almost uniformly from the entire circumference of the valve body 30a. The pressure adjustment becomes smooth. Furthermore, uneven wear of the contact surfaces of the valve body 30a and the bottom wall 21a is reduced.

  FIG. 7 shows a further modification. In this example, the shape of the bottom wall 21a is different, and the other parts are the same as those in FIGS. In this example, what is equivalent to the first annular protrusion 35 of FIGS. 5 and 6 is provided on the bottom wall 21a.

  That is, instead of the first annular protrusion 35 provided on the valve body 30a, a second annular protrusion 36 having an arcuate cross section protruding in the valve body 30a direction is provided on the bottom wall 21a. By providing the second annular protrusion 36, when the valve body 30a is closed, the entire circumference of the tip of the second annular protrusion 36 abuts the valve body 30a substantially uniformly. As a result, the second annular protrusion 36 and the valve body 30a are well closed, and the closing force therebetween is increased, and when the valve body 30a is opened, the pressure escapes almost uniformly from the entire circumference of the valve body 30a. The pressure adjustment becomes smooth. Furthermore, uneven wear of the contact surfaces of the valve body 30a and the bottom wall 21a is reduced.

  In the valve 30 described above, the leg portion 30b extends from the outer peripheral end of the valve 30 while being inclined outward, and further, the valve 30 has a horizontal protrusion 30c extending outward at the outer end portion of the leg portion 30b. In the following, other valves having different shapes will be described. It is basically the same as that described with reference to FIGS. 1 to 7, and detailed description will be omitted, and different points will be mainly described.

  The valve 30 shown in FIG. 8 is configured such that a part of the leg portion 30b is curved outward to form an outward curved portion 30b1, and the others are the same as those shown in FIGS. To explain, the plurality of leg portions 30b provided on the valve body 30a are curved outward at the portion continuing to the outer peripheral end of the valve body 30a to form an outward curved portion 30b1, and from the tip of the outward curved portion 30b1 The leg 30a is formed as a whole by inclining and extending outward.

  Specifically, the plurality of leg portions 30b provided on the valve body 30a are curved outward from the outer peripheral end of the valve body 30a to form an outward curved portion 30b1, and further inclined and extended outward. . And the horizontal protrusion part 30c extended further outward is formed in the outer-end part which inclined and extended outward. As the shape of the outwardly curved portion 30b1, various shapes having different curvature radii such as an arc shape or a U shape can be used, but a smaller curvature radius is preferable. In addition, although the outward curved part 30b1 showed one thing, you may provide multiple in the up-down direction. Further, instead of the outward bending portion 30b1, it may be formed as an inward bending portion 30b2 described later.

  This outwardly curved portion 30b1 is deformed in the vertical direction by the action of a spring material when a force is applied in the vertical direction in the figure. Thus, since the outward curved portion 30b1 is deformed in the vertical direction, the responsiveness of the valve 30 is improved together with the spring of the inclined portion, and the opening and closing of the valve 30 becomes smoother. Further, the lateral movement distance of the horizontal protrusion 30c can be shortened by the amount of deformation of the outward curved portion 30b1, and the relief valve 20 can be downsized.

  The valve 30 shown in FIG. 9 is similar to the valve shown in FIG. 8 and is formed by bending a part of the leg 30b to form a curved part. However, the valve 30 shown in FIG. And different. Others are the same as those of FIGS. Explaining, the plurality of leg portions 30b provided on the valve body 30a are inclined and extended outward from the outer peripheral end of the valve body 30a, and the inwardly curved portion 30b2 is formed by bending the outer end portion of the tip end inwardly. To form.

  Specifically, the plurality of leg portions 30b provided on the valve body 30a are inclined and extended outward from the outer peripheral end of the valve body 30a, and an inwardly curved portion 30b2 curved inward is formed at the tip thereof. Furthermore, the horizontal protrusion part 30c extended outward is formed in the front-end | tip of the inward bending part 30b2. The shape and operational effects of the inwardly curved portion 30b2 are the same as those of the outwardly curved portion 30b1 in FIG. 8 except for the direction of bending. In addition, although the one inward bending part 30b2 was shown, you may provide two or more in the up-down direction. Further, instead of the inwardly curved portion 30b2, the outer curved portion 30b1 may be formed.

  The valve 30 shown in FIG. 10 is similar to the one in FIG. 9, and a part of the leg 30 b is curved to form a curved portion, but the projection direction of the horizontal protrusion 30 c is different from that in FIG. 9. Others are the same as those of FIGS. Explaining, the plurality of leg portions 30b provided on the valve body 30a are inclined and extended outward from the outer peripheral end of the valve body 30a, and the inwardly curved portion 30b2 is formed by bending the outer end portion of the tip end inwardly. To form.

  Specifically, the plurality of leg portions 30b provided on the valve body 30a are inclined and extended outward from the outer peripheral end of the valve body 30a, and an inwardly curved portion 30b2 curved inward is formed at the distal end portion thereof. Further, a horizontal projecting portion 30c extending inward is formed at the tip of the inwardly curved portion 30b2. The shape and operational effect of the inwardly curved portion 30b2 are substantially the same as those of the outwardly curved portion 30b1 in FIG. 8 except for the direction of bending.

  Thus, by providing the horizontal protrusion 30c inward, the valve 30 can be reduced in size, and the entire relief valve 20 can be reduced in size.

  The valve 30 shown in FIG. 11 has a leg portion 30b vertical and is provided with a bellows-like unevenness 30d in the middle thereof, and the other portions are the same as those in FIGS. If it demonstrates, the several leg part 30b provided in the valve body 30a will extend perpendicularly | vertically from the outer periphery end of the valve body 30a, and will form the bellows-like unevenness | corrugation 30d in the middle. The bellows-like irregularities 30d are formed by alternately stacking a plurality of upper and lower curved portions 30b1 and 30b2 shown in FIGS. 8 to 10 in the vertical direction by the action of a spring material. Transforms into

  Specifically, the plurality of leg portions 30b provided on the valve body 30a extends in the vertical direction from the outer peripheral end of the valve body 30a, and has a bellows-like unevenness 30d in the middle thereof, and further the tips of the vertical leg portions 30b. A horizontal protrusion 30c extending outward is formed. In this example, the valve body 30a is opened and closed by utilizing the function of the bellows-like irregularities 30d deforming in the vertical direction, and the horizontal movement of the horizontal protrusion 30c is not so much.

  In the case of this example, the opening degree characteristic can be easily set by adjusting the number and shape of the bellows-like irregularities 30d. Further, since the leg portion 30b is vertical and the horizontal protrusion 30c does not move much, the valve 30 can be reduced in size, and the entire relief valve 20 can be reduced in size.

  The valve 30 shown in FIG. 12 is a modification of the one shown in FIG. 11, and specifically, a horizontal protrusion 30c is provided in the inward direction. If it demonstrates, the several leg part 30b provided in the valve body 30a will extend perpendicularly | vertically from the outer periphery end of the valve body 30a, and will form the bellows-like unevenness | corrugation 30d in the middle. The bellows-like irregularities 30d are formed by alternately stacking a plurality of upper and lower curved portions 30b1 and 30b2 shown in FIGS. 8 to 10 in the vertical direction by the action of a spring material. Transforms into

  Specifically, the plurality of leg portions 30b provided on the valve body 30a extends in the vertical direction from the outer peripheral end of the valve body 30a, and has a bellows-like unevenness 30d in the middle thereof, and further the tips of the vertical leg portions 30b. A horizontal protrusion 30c extending inwardly is formed. In this example as well as in FIG. 11, the valve body 30a is opened and closed by utilizing the function of the bellows-like unevenness 30d deforming in the vertical direction, and the horizontal protrusion 30c does not move much.

  Also in this example, the opening degree characteristic can be easily set by adjusting the number and shape of the bellows-like irregularities 30d. Further, since the leg portion 30b is vertical and the horizontal protrusion 30c is not laterally moved, and the horizontal protrusion 30c is provided in the inward direction, the valve 30 can be further reduced in size, and the entire relief valve 20 can be further improved. It can be downsized.

  The valve 30 shown in FIG. 13 is configured to incline the leg 30b inward, and is otherwise the same as that shown in FIGS. If it demonstrates, the several leg part 30b provided in the valve body 30a will incline and extend from the outer peripheral end of the valve body 30a.

  Specifically, the plurality of leg portions 30b provided on the valve body 30a extends inwardly from the outer peripheral end of the valve body 30a, and further forms a horizontal protrusion 30c extending outward at the extended tip. Yes.

  In the case of this example, when a force is applied to the valve body 30a from below, the leg portion 30b rotates inward, the horizontal protrusion 30c moves inward, and as a result, the valve body 30a moves up and down. . Thus, this valve 30 has the same effect as that of FIGS. 1-7 because the leg 30b and the horizontal protrusion 30c move inward, and the valve 30 is smaller than that of FIGS. The entire relief valve 20 can be downsized.

  The valve 30 shown in FIG. 14 forms a bent part provided at the tip of the leg part 30b with a certain angle, and the other parts are the same as those shown in FIGS. If it demonstrates, the several leg part 30b provided in the valve body 30a will incline outward from the outer peripheral end of the valve body 30a, and will form the inclined bending part 30e in the front-end | tip further.

  The bent part 30e is provided in such a form that it is further inclined outward from the tip of the leg part 30b which is not horizontal but is inclined. That is, the bent portion 30e is bent in a form in which the angle θ1 between the bent portion 30e and the leg portion 30b is an obtuse angle.

  In the case of this example, since the bent portion 30e also has a spring action, the opening degree characteristic can be improved with the leg portion 30b.

  The valve 30 shown in FIG. 15 is different from FIG. 14 in that the angle of the bent portion provided at the tip of the leg portion 30b is different, and the other portions are the same as those in FIGS. To explain, the plurality of leg portions 30b provided on the valve body 30a are inclined and extended outwardly from the outer peripheral end of the valve body 30a, and further, the inclined folds are bent at the front ends so as to face the leg portions 30b. It has a curved portion 30e.

  The bent part 30e is provided in a form bent from the tip of the leg part 30b that is not horizontal but outward so as to face the leg part 30b. That is, the bent portion 30e is bent in such a manner that the angle θ2 between the bent portion 30e and the leg portion 30b is an acute angle.

  In the case of this example, the same operation as that shown in FIGS. In addition, the movement to the horizontal direction of the leg part 30b can be made easy by making the upper end of the bending part 30e into circular arc shape.

  The present invention is not limited to the configuration of each of the embodiments described above, and can be appropriately changed in design without departing from the gist of the invention.

Sectional drawing which shows the state before the assembly of the relief valve of this invention Sectional drawing which shows the state after the assembly of the relief valve of this invention The top view which shows the state without the cover member of FIG. Sectional drawing which shows the state at the time of valve opening of the relief valve of this invention Sectional view of another relief valve of the present invention The top view which shows the state without the cover member of FIG. Sectional view of still another relief valve of the present invention Sectional view of another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Sectional view of still another valve of the present invention Cross-sectional view of a conventional relief valve Cross-sectional view of another conventional relief valve

Explanation of symbols

DESCRIPTION OF SYMBOLS 20 ... Relief valve 21 ... Valve case 21a ... Bottom wall 21b ... Side wall 22 ... Cover member 22a ... Inner bottom surface 23 ... Internal space 24 ... 1st channel | path 25 ... 2nd channel | path 26 ... Valve support member 30 ... Valve 30a ... Valve body 30b ... Leg part 30c ... Horizontal protrusion part 30b1 ... Outward curved part 30b2 ... Inwardly curved part 30d ... Bellows-like uneven part 30e ... Bent part 35 ... First annular protrusion 36 ... Second annular protrusion

Claims (15)

A valve case having an inner space and forming an outer shell; a first passage that opens into the inner space and communicates with a pressure generation source; a second passage that opens into the inner space and releases pressure; and is provided in the inner space. A relief valve having a valve for communicating or blocking the internal space and the first passage;
The valve has a valve body and a plurality of legs extending from the valve body,
The leg is formed of a spring material,
The valve shuts off the internal space and the first passage when the pressure of the pressure source is below a predetermined value, and connects the internal space and the first passage when the pressure of the pressure source exceeds a predetermined value. A relief valve that communicates and varies an opening area of the internal space and the first passage in accordance with a magnitude of pressure greater than the predetermined value.   The relief valve according to claim 1, wherein the leg portion is inclined and extended outward from an outer peripheral end of the valve body.   2. The relief valve according to claim 1, wherein the leg portion is curved outward from an outer peripheral end of the valve body, and is further inclined and extended outward.   2. The relief valve according to claim 1, wherein the leg portion is inclined and extended outward from an outer peripheral end of the valve body, and further curved inward.   The relief valve according to claim 1, wherein the leg portion is inclined and extended inward from an outer peripheral end of the valve body.   2. The relief valve according to claim 1, wherein the leg portion extends in a vertical direction from an outer peripheral end of the valve body and has a bellows-like unevenness in the middle thereof.   The relief valve according to any one of claims 1 to 6, further comprising a bent portion at an outer end portion of the leg portion.   The relief valve according to claim 7, wherein the bent portion is a horizontal protrusion.   The relief valve according to claim 7, wherein the bent portion has an angle with respect to a horizontal plane.   The relief valve according to claim 8, wherein the horizontal protrusion extends outward from an outer end of the leg.   The relief valve according to claim 8, wherein the horizontal protrusion extends inward from an outer end of the leg.   The relief valve according to any one of claims 1 to 11, wherein the valve is formed integrally from a spring material.   The relief valve according to any one of claims 1 to 12, wherein the valve body has a first annular protrusion protruding toward the first passage side.   The relief valve according to any one of claims 1 to 12, further comprising a second annular protrusion protruding toward the valve body on the valve case surface with which the valve body abuts.   The relief valve according to claim 1, wherein the relief valve is for a fuel tank.

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