JP2011011693A - Flap valve unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flap valve unit which allows a flap valve to be smoothly attached onto a body section without breaking or damaging a pin.SOLUTION: The flap valve unit includes the body section 20, a valve element 40, and a spring member 60; wherein the body section 20 has attachment arms 25A, 25B and a spring mount 35, and the valve element 40 has pivot arms 41, 41 and pins 43A, 43B. Each pin has a pin insertion hole 28, and the attachment arm 25A has a pin abutment portion 30, which temporarily places the pin 43A with the pin 43B inserted in the insertion hole 28 in the attachment arm 25A, and a guide portion 31 extending from the pin abutment portion 30 to the pin insertion hole 28. The spacing between the outer faces surrounding the pin insertion holes in the attachment arms 25A, 25B is formed to be narrower than the spacing between the inner faces of the pivot arms 41 and wider than the spacing between the distal end faces of the pins 43A, 43B.

Description

  The present invention relates to a flap valve device suitable for a check valve attached to an opening of a fuel injection pipe connected to a fuel tank of an automobile, for example.

  For example, a fuel injection pipe connected to a fuel filler port is connected to a fuel tank of an automobile, and a flap valve device may be disposed as a check valve at a downstream opening of the fuel injection pipe. Then, the flap valve is opened during refueling to allow fuel to flow into the tank, and the flap valve is closed after refueling to prevent back flow of fuel into the fuel injection pipe.

  As this type of flap valve device, the following Patent Document 1 discloses a flap valve (valve member) that opens and closes a lower end opening of a pipe (pipe body), a bracket (protrusion) that rotatably supports the flap valve, and the flap. A flap valve device (fuel refueling pipe assembly) is disclosed that includes a torsion spring that biases the valve in a closing direction.

  The bracket is erected with a predetermined width from the periphery of the pipe opening toward the outer diameter direction, and a slot in the shape of a notch extending from the back side to the axial direction of the pipe is formed. One side in the width direction of the slot extends to the front side of the bracket, whereby one side in the width direction of the bracket forms a portion for holding the coil portion of the torsion spring. On the other hand, the flap valve has a disk-shaped valve body, a pair of arms extending from the outer periphery thereof, and a pair of pins (trunnions) projecting from the inner end of each arm.

  Then, after the coil portion of the torsion spring is accommodated and held inside one side portion in the width direction of the bracket, a pair of pins are positioned at both end portions on the back side of the slot, and the flap valve is pulled toward the pipe opening side. . Then, one pin is press-fitted into the inner periphery of the end of the slot in the width direction on the outer side of the holding portion of the spring member, and the other pin is the end of the other side in the width direction of the slot. The flap valve is attached to the inner periphery of the part so that the flap valve can be opened and closed at the pipe opening.

Japanese Patent No. 4151012

  In Patent Document 1, since the slot has only a groove shape cut out from the back side of the bracket, it is difficult to accurately position the pair of pins at both end portions on the back side of the slot. When the pair of pins is press-fitted from a position not aligned with the slot, an excessive load may be applied to the pins, which may cause inconvenience that the pins are broken, broken, or deformed. On the other hand, when trying to align the pin with the slot with high accuracy, the alignment work takes time and a problem arises in the workability of attaching the flap valve.

  Further, the slot formed in the bracket is in a state where the back side is open because a pair of pins are press-fitted from the back side. Since the pair of pins is pivotally supported in such a slot, when a strong external force or the like acts on the flap valve, the pair of pins may come out of the slot and the flap valve may come off. .

  Accordingly, an object of the present invention is to provide a flap valve device that can be smoothly attached to the main body portion without causing pin breakage or the like.

In order to achieve the above-described object, the present invention provides a cylindrical main body having an internal liquid flow path, a flap-shaped valve body attached to one end opening of the main body so as to be openable and closable, In a flap valve device provided with a spring member that normally biases in the direction of closing toward the one end opening of the main body,
The main body has a pair of mounting arms extending from the side wall and projecting toward the one end opening, and a spring mounting for supporting the spring member,
The valve body has a pair of rotating arms extending substantially in parallel toward the outside, and a pair of pins protruding in directions facing each other from the distal ends of the pair of rotating arms,
Each of the pair of mounting arms has a pin insertion hole into which the pin is inserted, and one of the pair of mounting arms has one pin inserted into the pin insertion hole of the other mounting arm. In this state, it has a pin contact portion for temporarily placing the other pin, and a guide portion made of an inclined surface extending from this pin contact portion to the corresponding pin insertion hole,
The interval between the outer surfaces around the pin insertion holes of the pair of mounting arms is narrower than the interval between the inner surfaces of the pair of rotating arms, and wider than the interval between the tip surfaces of the pair of pins. A flap valve device is provided.

  In the present invention, the pin contact portion is located radially outward of the main body portion with respect to the pin insertion hole of the one mounting arm and at a position shifted in the axial direction of the main body portion. A first inclined surface that passes when the guide portion moves from the pin contact portion to a position aligned with the axial direction of the main body portion with respect to the pin insertion hole; and the axial direction of the guide portion. It is preferable that it is comprised with the 2nd inclined surface which reaches the said pin insertion hole from the position matched with.

  In the present invention, the valve body is provided with an angle restricting portion for restricting a maximum opening angle of the valve body, and when the pin is inserted into the pin insertion hole along the guide portion, An inclined surface is formed at the tip of the pin so as to be along the inclined surface of the guide portion immediately before reaching the pin insertion hole in a state where the body is at the maximum opening angle restricted by the angle restricting portion. It is preferable.

  According to the present invention, the pin of the corresponding rotating arm is inserted into the pin insertion hole of one mounting arm of the main body, and the pin of the other rotating arm is temporarily placed on the contact portion of the other mounting arm. In this state, by sliding the pin along the inclined surface of the guide portion, the pin can move on the inclined surface while the pair of rotating arms are slightly opened, and can be inserted into the corresponding pin insertion hole.

  Thus, when both pins are respectively inserted into the pin insertion holes, the distance between the outer surfaces around the pin insertion holes of the pair of mounting arms is narrower than the distance between the inner surfaces of the pair of rotating arms. Since it is formed so as to be wider than the distance between the front end surfaces, the pin is prevented from coming off in the insertion hole, and the valve body can be rotatably mounted.

  In this manner, with one pin inserted into the corresponding pin insertion hole, the other pin is temporarily placed on the contact portion, and in this state, the pin is slid along the slope of the guide portion, and the corresponding Since it is inserted into the pin insertion hole, it can be inserted into the corresponding pin insertion hole without any excessive load, and it can be inserted smoothly into the corresponding pin insertion hole, thereby improving the mounting workability of the valve body. In addition, the pins can be reliably prevented from being damaged or deformed.

It is a disassembled perspective view which shows one Embodiment of the flap apparatus of this invention. It is a perspective view of the valve body which comprises the flap valve apparatus. It is a principal part perspective view of the flap valve apparatus. In the flap valve device, one of the valve body and one of the rotating arms showing a state where one pin is inserted into the pin insertion hole of the other mounting arm and the other pin is temporarily placed on one mounting arm. It is a perspective view which cuts and shows a part. FIG. 5 is a perspective view of the flap valve device, showing a state in which the other pin is slid from the state shown in FIG. FIG. 6 is a perspective view of the flap valve device, showing a state where the other pin is inserted into the pin insertion hole from the state shown in FIG. It is a plane explanatory view of the flap valve device. It is side surface explanatory drawing of the flap valve apparatus. It is explanatory drawing which shows the state which attached the flap valve apparatus to the fuel tank. It is a disassembled perspective view which shows other embodiment of the flap apparatus of this invention.

  Hereinafter, an embodiment of a flap valve device according to the present invention will be described with reference to the drawings.

  As shown in FIG. 9, a flap valve device 10 (hereinafter referred to as “valve device 10”) in this embodiment is used as a fuel backflow prevention valve, and is a fuel injection pipe P (hereinafter referred to as “pipe P”) of a fuel tank. The fuel injected into the pipe P from the oil supply port on the upstream side of the pipe is allowed to flow into the fuel tank through the pipe P, and the fuel that has flowed into the fuel tank is It plays the role of preventing backflow. In the following description, “upstream side” and “downstream side” indicate the direction of fuel flow. Specifically, the side of the pipe P where the valve device 10 is provided is the downstream side, and the fuel filler port of the pipe P is connected. The description will be made assuming that the side to be operated (the side opposite to the valve device 10) is the upstream side.

  As shown in FIG. 1, the valve device 10 according to this embodiment includes a cylindrical main body portion 20 in which a liquid flow path is formed, and a flap-like shape that is attached to one end opening 21 of the main body portion 20 so as to be opened and closed. A valve body 40 and a spring member 60 that normally biases the valve body 40 in a direction to close toward the one end opening 21 of the main body 20 are provided.

  Further, the main body 20 in this embodiment is attached to the downstream opening of the pipe P via a tank attachment member 70. As shown in FIGS. 1 and 9, the tank mounting member 70 has a main body connecting pipe 71 whose downstream end is inserted into the upstream opening of the main body 20, and the upstream end is the pipe. A pipe connection pipe 73 inserted into the downstream opening of P (see FIG. 9) is formed, and an annular flange 75 is formed in the middle of the axial direction and fixed to the periphery of the mounting hole Ta of the fuel tank T by welding. .

  In addition, although the main-body part 20 of this embodiment is attached to the downstream of the pipe P via the said tank attachment member 70, let the pipe P itself be a main-body part which concerns on this invention, and its downstream opening The valve element 40 may be directly attached to the portion (in this case, one end opening of the present invention).

  Returning to the description of the main body 20, the main body 20 is formed in a substantially cylindrical shape in which both the upstream side and the downstream side are opened, the downstream side opening portion forms one end opening portion 21, and a portion to which the valve body 40 is attached. The tip of the peripheral wall on the outer periphery of the same end opening 21 forms a valve seat 22 to which the valve body 40 contacts and separates. Further, the upstream end of the main body 20 is slightly enlarged in diameter, and a step portion 23 is formed on the inner periphery of the main body 20 so that the main body connection pipe 71 of the tank mounting member 70 is fitted (see FIG. 9).

  As shown in FIGS. 1, 3, and 8, a pair of mounting arms 25 </ b> A and 25 </ b> B arranged in parallel at a predetermined interval are provided at predetermined positions in the circumferential direction of the side wall 24 of the main body 20 and both mounting arms 25 </ b> A and 25 </ b> B. A spring mounting portion 35 disposed between the two ends extends toward the one end opening 21 side.

  Each mounting arm 25A, 25B extends from the side wall 24 toward the outer diameter direction at a predetermined height, and extends from the base portion 26 toward the one end opening 21 side. It has a tip portion 27 protruding in length, and a long hole-like pin insertion hole 28 formed at the tip portion 27 and extending a predetermined length along the axial direction of the main body portion 20.

  In this embodiment, the pin insertion holes 28 and 28 are respectively provided in the lower half of the distal end portion 27 (a portion close to the side wall 24 of the main body portion 20). Are aligned with each other in the axial direction and the outer diameter direction. Then, the pins 43A and 43B of the valve body 40 to be described later are inserted into the long hole-shaped pin insertion holes 28 and 28, respectively, and hold the pins 43A and 43B so as to be slidable in the axial direction and support the rotation. (See FIG. 8).

  Further, as shown in FIG. 7, the distance A between the outer surfaces around the pin insertion holes 28 of the pair of mounting arms 25A, 25B is the inner surface of a pair of rotating arms 41, 41 of the valve body 40 described later. The gap B1 is narrower than the gap B1 and wider than the gap B2 between the tip surfaces of the pair of pins 43A and 43B of the valve body 40 (relationship B2 <A <B1).

  And in this valve apparatus 10, as shown in FIGS. 3-7, in the state which inserted one pin 43B in the pin insertion hole 28 of one attachment arm 25B, the other pin 43A is attached to the other attachment arm 25A. Are formed, and a pin contact portion 30 for temporarily placing the pin 43A from the pin contact portion 30 to the corresponding pin insertion hole 28 is formed. That is, in this state, the other pin 43 </ b> A can be inserted into the corresponding pin insertion hole 28 from the pin contact portion 30 through the guide portion 31.

  Referring also to FIG. 3, the pin contact portion 30 for temporarily placing the pin 43A is radially outward of the main body portion 20 with respect to the pin insertion hole 28 of the corresponding mounting arm 25A, and the main body It is arranged at a position shifted in the axial direction of the portion 20 (in this embodiment, a position shifted toward the one end opening 21 side of the main body portion 20). In this embodiment, the tip 27 of the mounting arm 25A is cut out in an L shape to form the pin contact portion 30.

  Between the pin contact portion 30 and the pin insertion hole 28, a guide portion 31 for guiding the pin 43A to the pin insertion hole 28 is provided. The guide portion 31 is aligned with the first inclined surface 32 that passes when the guide insertion portion 31 moves from the pin contact portion 30 to a position aligned with the axial direction of the main body portion 20 with respect to the pin insertion hole 28. The second inclined surface 33 extends from the position to the pin insertion hole 28. The first inclined surface 32 forms an inclined surface that gradually increases in height along the axial direction toward the second inclined surface 33, and the second inclined surface 33 gradually increases in height toward the base side of the mounting arm 25A. It has an inclined surface that becomes higher. And the opening part of the pin insertion hole 28 is located in the place which went up the 2nd inclined surface 33 completely.

  In addition, a pair of climbing prevention ribs 34, 34 formed on the outer side surfaces of the mounting arm 25 </ b> A on both sides in the longitudinal direction of the pin insertion hole 28, along the outer diameter direction of the main body 20. Is growing. The climbing prevention ribs 34, 34 guide the pin 43A with the guide portion 31 so that the pin 43B is inserted into the pin insertion hole 28 of the mounting arm 25B and the pin 43A is inserted into the pin insertion hole 28 of the mounting arm 25A. When moving, the pin 43A holds the guide portion 31 so as not to come off, and serves to reliably guide the pin 43A to the pin insertion hole 28.

  As shown in FIGS. 3 and 7, the spring mounting portion 35 that is provided between the mounting arms 25A and 25B and supports the spring member 60 is parallel to the mounting arms 25A and 25B in this embodiment. It is arranged at a position eccentric to the arm 25B side. The spring mounting portion 35 includes a base portion 37 erected in the outer diameter direction from the side wall 24 of the main body portion 20, and is parallel to the axis of the main body portion 20 from the base portion 37 and toward the one end opening 21 side. The support arm 36 extends linearly and protrudes longer than the tips of the mounting arms 25A and 25B.

  A spring support shaft 36a protrudes from the side surface of the support arm 36 on the side of the mounting arm 25A toward the mounting arm 25A with a predetermined length, and supports a coil portion 61 of a spring member 60 described later. It has become a part. A semi-circular spring retaining piece 36b is eccentrically provided at the tip of the spring support shaft 36a in the direction approaching the main body portion 20, and the coil portion 61 of the spring member 60 is removed from the spring support shaft 36a. It is difficult.

  Further, a spring holding groove 37 a is provided between the base end of the support arm 36 and the mounting arm 25 </ b> A side and the protruding portion of the base portion 37. Then, as shown in FIG. 4, one leg portion 62 of the spring member 60 is inserted into the spring holding groove 37a to prevent it from coming off. FIG. 4 is a perspective view showing a part of the valve body 40 and a part other than the pin 43A of one rotating arm 41 by cutting away.

  On the other hand, the flap-shaped valve body 40 has a shape that fits the one end opening 21 of the main body 20, and has a disk shape that is slightly larger in diameter than the one end opening 21 in this embodiment. A pair of rotating arms 41 projecting from the upper part of the valve body 40 on the downstream side (surface facing inward of the tank) in the outer diameter direction and extending along the axial direction of the valve body 40. , 41 and the angle restricting portion 44 arranged between the rotating arms 41, 41 are arranged in parallel.

  A pair of cylindrical pins 43A and 43B inserted into the pin insertion holes 28 and 28 of the mounting arms 25A and 25B from the distal ends in the extending direction of the pair of turning arms 41 and 41, respectively. Projecting in directions facing each other.

  Further, the angle restricting portion 44 extends longer than each of the rotating arms 25A and 25B, and the tip thereof is obliquely cut away so that the valve body 40 is opened to the maximum with respect to the one end opening 21 of the main body portion 20. When this occurs, it is in contact with the outer peripheral surface of the side wall 24 of the main body portion 20, and the valve body 40 is restricted from further opening to define the maximum opening angle.

  As shown in FIGS. 2, 4, and 5, in relation to the angle restricting portion 44, the valve body 40 is attached to the tip end portion of the pin 43 </ b> A inserted into the pin insertion hole 28 of the mounting arm 25 </ b> A. An inclined surface 45 is formed along the inclined surface (here, the second inclined surface 33) immediately before reaching the pin insertion hole 28 of the guide portion 31 in the state where the maximum opening angle is regulated by the above.

  Further, as shown in FIG. 4, a spring engagement member for locking the tip of the other leg portion 62 of the spring member 60 is provided at the center of the surface side of the valve body 40 (the surface side facing the inside of the tank). A stop protrusion 40a is provided to protrude. A pair of ribs 40b and 40b protrude on both sides of the spring locking projection 40a in order to prevent displacement of the other leg 62. The spring member 60 includes the valve body 40 as a main body by one leg 62 inserted and held in the spring holding groove 37a and the other leg 62 locked by the spring locking protrusion 40a. The one end opening 21 of the portion 20 is urged so as to be always closed.

  Since the valve body 40 is slidably supported by the elongated pin insertion holes 28 and 28 of the mounting arms 25A and 25B, a seal flange 50 made of rubber or the like attached to the valve body 40 described later is provided. Even if the seal position of the seal flange 50 relative to the valve seat 22 changes due to swelling, the valve body 40 can be appropriately slid in the axial direction correspondingly (see FIG. 8). The performance can be maintained. Further, as described above, since the central portion of the valve body 40 is pressed by the other leg portion 62 of the spring member 60, the slide-supported valve body 40 is moved in the radial direction of the main body portion 20. Therefore, the sealing performance of the valve body 40 against the valve seat 22 can be more reliably maintained.

  As shown in FIGS. 1 and 9, a seal flange 50 made of rubber, elastomer or the like is disposed on the back surface side of the valve body 40 in order to improve the sealing performance with the one end opening 21 of the main body 20. ing. A fixing member 52 is further arranged on the back surface side of the seal flange 50, and a pair of engaging claws 52a and 52a protruding from the fixing member 52 are passed through the insertion holes 50a and 50a of the seal flange 50. The seal flange 50 is sandwiched and fixed between the valve body 40 and the fixing member 52 by engaging with engagement holes 40c and 40c provided on both sides of the spring locking projection 40a of the body 40, respectively. (See FIG. 9). As shown in FIG. 9, the outer peripheral edge of the seal flange 50 contacts the valve seat 22, and the one end opening 21 of the main body 20 is sealed in a closed state.

  The main body 20 and the valve body 40 constituting the valve device 10 may be made of a synthetic resin such as polyacetal or polyamide having high fuel permeability and relatively high rigidity. A synthetic resin such as small polyethylene can also be used.

  Next, the assembly procedure and operational effects of the valve device 10 of the present invention having the above-described configuration will be described.

  First, the coil portion 61 of the spring member 60 is sheathed on the spring support shaft 36a of the spring mounting portion 35 of the main body portion 20, and one leg portion 62 is inserted and supported in the spring holding groove 37a of the main body portion 20 (see FIG. 4).

  Thereafter, the pin 43B of the corresponding rotating arm 41 is inserted into the pin insertion hole 28 of one mounting arm 25B of the main body 20, and the corresponding rotating arm is inserted into the pin abutting portion 30 of the other mounting arm 25A. 41 pins 43A are temporarily placed (see FIG. 4). At this time, the other leg portion 62 of the spring member 60 is deformed against the elastic force and disposed on the surface side of the valve body 40 and is locked to the spring locking protrusion 40a at the center of the valve body 40.

  Then, until the angle restricting portion 44 of the valve body 40 contacts the outer peripheral surface of the side wall 24, the valve body 40 is rotated in the direction of opening the one end opening 21 (see FIG. 4), and is provided at the tip of the pin 43A. The inclination angle of the inclined surface 45 is adjusted to the inclination angle of the second inclined surface 33 of the mounting arm 25A (see FIGS. 4 and 7).

  In this state, as shown in FIG. 5, the pin 43 </ b> A is pushed toward the upstream side, passes through the first inclined surface 32, rides on the second inclined surface 33, and slides until it hits the overpass prevention rib 34. . 5 is a perspective view showing a part of the valve body 40 and a part other than the pin 43A of one rotating arm 41 in a manner similar to FIG. At this time, the rotating arm 41 on the pin 43A side is pressed by the inclined surfaces 32 and 33, and is slightly opened with respect to the rotating arm 41 on the pin 43B side.

  Thereafter, when the pin 43A is pushed toward the pin insertion hole 28, the pin 43A slides on the second inclined surface 33, and the pin 43A gets over the top of the second inclined surface 33 and reaches the pin insertion hole 28. As shown in FIG. 6, the swung arm 41 on the side of the pin 43 </ b> A that has been spread open is elastically restored, and the pin 43 </ b> A is inserted into the pin insertion hole 28. 6 is a perspective view showing a part of the valve body 40 and a part other than the pin 43A of the one rotating arm 41 in the same manner as FIGS.

  At this time, at the tip of the pin 43A, the inclined surface immediately before reaching the pin insertion hole 28 of the guide portion 31, that is, the second inclined surface 33, with the valve body 40 at the maximum opening angle by the angle restricting portion 44. Since the inclined surface 45 is formed so as to follow, the pin 43A can be inserted more smoothly and smoothly.

  As described above, in this embodiment, the pin 43A is once moved along the first inclined surface 32 to a position aligned with the axial direction of the main body portion 20 and then along the second inclined surface 33 to the pin insertion hole 28. By moving the pin 43A, the pin 43A can be easily inserted, and the pin abutting portion 30 and the pin insertion hole 28 are moved as close as possible, and the slide movement process of the pin 43A by the inclined surface of the guide portion 31 is performed. As long as possible, it is possible to insert the pin 43A without excessive force without applying an excessive load to the pin 43A.

  Thus, the pair of pins 43A and 43B are inserted into the corresponding pin insertion holes 28 and 28, respectively. At this time, as shown in FIG. 7, the distance A between the outer surfaces around the pin insertion holes 28 of the pair of mounting arms 25A, 25B is larger than the distance B1 between the inner surfaces of the pair of rotating arms 41, 41. The valve body 40 is formed in a state in which the pins 43A and 43B are prevented from being pulled out by the pin insertion holes 28 and 28 because they are narrow and formed to be wider than the distance B2 between the tip surfaces of the pair of pins 43 and 43. It can be mounted so that it can rotate.

  As described above, in the valve device 10 according to this embodiment, the pin 43A is temporarily placed on the pin contact portion 30 of the mounting arm 25A with the pin 43B inserted into the pin insertion hole 28 of the mounting arm 25B. After that, the pin 43A is inserted into the corresponding pin insertion hole 28 while opening the rotating arms 41, 41 while being guided by the guide portion 31 including the first inclined surface 32 and the second inclined surface 33. ing. Accordingly, it is possible to suppress an excessive load from acting on the pair of pins 43A and 43B and to insert the pin into the corresponding pin insertion holes 28 and 28 with an appropriate force without difficulty. 43B can be reliably prevented from being damaged or deformed.

  Further, unlike the above-mentioned Patent Document 1, it is not necessary to accurately position the pair of pins 43A and 43B. After the pin 43B is inserted into the pin insertion hole 28 of the mounting arm 25B, the pin 43A is pinned to the mounting arm 25A. The pair of pins 43A and 43B can be smoothly inserted into the corresponding pin insertion holes by a simple operation of temporarily placing them on the contact portions 30 and inserting them into the pin insertion holes 28 via the guide portions 31. The mounting workability of the valve body 40 can be improved.

  Further, the pair of pins 43A and 43B are not pivotally supported in the slots as in the above-mentioned Patent Document 1, but are inserted into the corresponding pin insertion holes 28 and 28 of the mounting arms 25A and 25B, respectively. Therefore, the pair of pins 43A and 43B can be securely held in a state where the pair of pins 43A and 43B are prevented from being detached, and the valve body 40 can be reliably prevented from coming off from the one end opening 21 of the main body portion 20.

  Further, the spring member 60 has its coil portion 61 mounted on the spring support shaft 36 a of the spring mounting portion 35, and is held off and held by a spring retaining piece 36 b, and one leg portion 62 is held by the spring of the main body portion 20. Inserted and supported in the holding groove 37a (see FIG. 4), and the other leg 62 is locked to the spring locking projection 40a in the center of the valve body 40, so that the spring member 60 is not easily detached and is firmly held. Thus, the mounting workability of the valve body 40 can be improved.

  FIG. 10 shows another embodiment of the flap valve device according to the present invention. Note that substantially the same parts as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The flap valve device 10a according to this embodiment (hereinafter referred to as “valve device 10a”) has a pin contact portion for temporarily placing the pin 43A, and guides the pin 43A to the pin insertion hole 28, as compared with the previous embodiment. The shape and position of the guide part to be performed are different.

  As shown in FIG. 10, the valve device 10 a includes a concave groove-shaped pin contact portion 30 on the outer surface of one mounting arm 25 </ b> A among the pair of mounting arms 25 </ b> A and 25 </ b> B extending from the main body portion 20. Is formed. The pin contact portion 30 has a length extending from the upper end of the mounting arm 25A to the same height as the pin insertion hole 28, and is formed at a constant depth. Further, an inclined surface that gradually increases in height from the bottom surface of the pin contact portion 30 toward the outer surface of the mounting arm 25A is formed between the pin contact portion 30 and the pin insertion hole 28. The guide part 31 which slide-guides 43A is comprised. In addition, a pair of climbing prevention ribs 34 and 34 project from the upper and lower side edges on the base side of the pin insertion hole 28 formed in the mounting arm 25A.

  Then, after the coil portion 61 of the spring member 60 is externally mounted on the spring support shaft 36a and one leg portion 62 is brought into contact with and supported by the spring support portion 38 of the main body portion 20, the pin insertion hole of one mounting arm 25B is provided. The pin 43B corresponding to 28 is inserted, and the pin 43A corresponding to the concave groove pin contact portion 30 of the other mounting arm 25A is inserted, and the pin 43A is temporarily placed. In this state, the valve body 40 is rotated, and the inclination angle of the inclined surface 45 of the pin 43A is adapted to the inclination angle of the guide portion 31 of the mounting arm 25A by the angle restricting portion 44.

  In this state, when the pin 43A is slid downstream toward the one end opening 21, the pin 43A is prevented from coming off by the pair of climbing prevention ribs 34, 34, and the rotating arm 41 is pushed and spread. 43A slides on the inclined surface of the guide portion 31, and is inserted into the pin insertion hole 28 of the mounting arm 25A.

  In this embodiment, since the pin abutting portion 30 has a concave groove shape, there is an advantage that the pin 43A can be securely placed temporarily without coming off.

10 Flap valve device 10, 10a Flap valve device (valve device)
20 Main body portion 21 One end opening portions 25A, 25B Mounting arm 28 Pin insertion hole 30 Pin contact portion 31 Guide portion 32 First inclined surface 33 Second inclined surface 35 Spring mounting portion 40 Valve body 41 Rotating arm 43 Angle restricting portion 43A , 43B Pin 44 Angle restricting portion 45 Inclined surface 60 Spring member

Claims (3)

A cylindrical main body part in which the inside forms a liquid flow path, a flap-shaped valve body attached to the one end opening part of the main body part so as to be openable and closable, and the valve body is always directed to the one end opening part of the main body part. In the flap valve device provided with a spring member biased in the closing direction,
The main body has a pair of mounting arms extending from the side wall and projecting toward the one end opening, and a spring mounting for supporting the spring member,
The valve body has a pair of rotating arms extending substantially in parallel toward the outside, and a pair of pins protruding in directions facing each other from the distal ends of the pair of rotating arms,
Each of the pair of mounting arms has a pin insertion hole into which the pin is inserted, and one of the pair of mounting arms has one pin inserted into the pin insertion hole of the other mounting arm. In this state, it has a pin contact portion for temporarily placing the other pin, and a guide portion made of an inclined surface extending from this pin contact portion to the corresponding pin insertion hole,
The interval between the outer surfaces around the pin insertion holes of the pair of mounting arms is narrower than the interval between the inner surfaces of the pair of rotating arms, and wider than the interval between the tip surfaces of the pair of pins. The flap valve device is characterized by being formed.   The pin contact portion is disposed radially outward of the main body portion with respect to the pin insertion hole of the one mounting arm and is shifted in the axial direction of the main body portion, The guide portion has a first inclined surface that passes when moving from the pin contact portion to a position aligned in the axial direction of the main body portion with respect to the pin insertion hole, and a position aligned in the axial direction. The flap valve device according to claim 1, further comprising a second inclined surface that reaches the pin insertion hole.   The valve body is provided with an angle restricting portion for restricting a maximum opening angle of the valve body, and when the pin is inserted into the pin insertion hole along the guide portion, the valve body is restricted to the angle restricting portion. The inclined surface is formed in the front-end | tip part of the said pin so that it may follow the inclined surface just before reaching the said pin insertion hole of the said guide part in the state set to the maximum opening angle regulated by the part. The flap valve device described.