JP6812195B2 - Flap valve device - Google Patents

Description

The present invention relates to a flap valve device that is attached to an opening of a fuel injection pipe connected to a fuel tank of an automobile or the like and is suitable for a check valve that prevents backflow of fuel.

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 arranged as a check valve at a downstream opening of the fuel injection pipe. The flap valve opens during refueling to allow fuel to flow into the tank, and the flap valve closes after refueling to prevent backflow of fuel into the fuel injection pipe.

Conventional patent documents 1 describe a tubular main body, a flap-shaped valve body that can be opened and closed at one end opening thereof, and a flap-shaped valve body that is always open at one end of the main body. It is provided with a spring member that urges the valve body in a closing direction toward the portion, and the main body portion has a support shaft that supports the valve body so as to be able to open and close, and the valve body has a bearing portion into which the support shaft is inserted. A flap valve device having a structure is described. Further, a shaft-shaped spring support portion for supporting the coil portion of the spring member is provided on the outer periphery of the main body portion on the one end opening side. As the spring member, a so-called torsion spring including a coil portion and a pair of leg portions extending from both ends thereof is used.

When assembling the flap valve device, after the coil portion of the spring member is attached to the axial spring support portion of the main body portion, one leg portion is locked to the outer periphery of the main body portion, and the other leg portion is engaged. By locking the valve body on the surface side and then inserting the support shaft of the main body into the bearing of the valve body, the valve body is assembled to the main body in a state of being urged by the spring member. It has become like.

International release WO2016 / 047690A1

In the case of the flap valve device of Patent Document 1, since the spring member is a torsion spring, as described above, after the coil portion is attached to the spring support portion of the main body portion, both legs are attached to the outer periphery of the main body portion. In addition, the spring member must be locked to the surface side of the valve body, which makes the assembly of the spring member troublesome and hinders the assembly workability of the valve device.

Therefore, an object of the present invention is to provide a flap valve device capable of easily assembling a spring member and improving the assembling workability of the flap valve device.

In order to achieve the above object, the flap valve device of the present invention includes a tubular main body having a liquid flow path inside, and a flap-shaped valve body that can be opened and closed at one end of the main body. When the valve body is opened from one end opening of the main body, a spring member that urges the valve body to close toward the one end opening, and one of the main body or the valve body are provided. It has a support shaft and a bearing portion provided on the other side of the main body portion or the valve body, which receives the support shaft and pivotally supports the valve body with respect to the main body portion. The spring member is made of a coil spring, a first support portion for supporting one end of the coil spring is formed on the outer periphery of the main body portion, and a second support portion for supporting the other end of the coil spring is formed on the valve body. It is characterized by being done.

According to the flap valve device of the present invention, the valve body can be attached to the main body portion by pivotally supporting the support shaft on the bearing portion, and the valve body is opened when the valve body is opened from one end opening of the main body portion. Since the spring member that urges the body toward the opening at one end is composed of a coil spring, a simple operation of supporting one end of the coil spring by the first support portion and the other end by the second support portion. Therefore, the spring member can be assembled, and the assembling workability of the flap valve device can be improved.

It is an exploded perspective view which shows one Embodiment of the flap valve device of this invention. It is a perspective view of the flap valve device. It is a top view of the flap valve device. In the flap valve device, it is sectional drawing in the arrow line AA of FIG. It is sectional drawing in BB arrow line of FIG. 3 in the flap valve device. FIG. 5 is a cross-sectional view of the flap valve device in a state where the valve body is opened from the state shown in FIG. FIG. 5 is a cross-sectional view of the flap valve device in a state where the valve body is opened from the state shown in FIG. It is explanatory drawing which shows the assembly direction of each member in the flap valve device.

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

As shown in FIG. 4, the flap valve device 10 (hereinafter referred to as “valve device 10”) in this embodiment is used as a fuel check valve, and fuel injection for injecting fuel into a fuel tank (not shown). The fuel, which is attached to the downstream side of the pipe P (hereinafter referred to as "pipe P") and injected into the pipe P from the fuel filler port on the upstream side of the pipe, flows into the fuel tank through the pipe P and in the fuel tank. It plays a role of preventing the fuel flowing into the pipe P from flowing back to the pipe P side. In the following description, "upstream side" and "downstream side" indicate the direction in which fuel flows. 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 side to be operated (the side opposite to the valve device 10) will be described as the upstream side.

As shown in FIGS. 1 and 2, the valve device 10 in this embodiment has a tubular main body 20 whose inside forms a liquid flow path 21 (see FIG. 4) and an opening 23 at one end of the main body 20. When the valve body 40 is opened with respect to the flap-shaped valve body 40 that can be opened and closed and the one end opening 23 of the main body 20, the valve body 40 is closed toward the one end opening 23. The urging spring member, the support shaft 31 provided on the main body 20, and the valve body 40 are provided, and the support shaft 31 is received to pivotally support the valve body 40 with respect to the main body 20. It has a bearing portion 45.

The spring member is formed of a coil spring 60, which is spirally wound with a wire rod having a predetermined diameter, has a shape extending linearly with a predetermined length, and does not have a pair of legs like a torsion spring, and has a length thereof. One end in the direction forms the other end 61 in the present invention, and the other end in the longitudinal direction forms the other end 63 in the present invention. The coil spring 60 does not necessarily have to be compressed in the mounted state in which the valve body 40 is closed, but preferably, the compression coil spring 60 is already compressed in the mounted state in which the valve body 40 is closed and always imparts urging force. Is preferably used.

First, the main body 20 will be described.

As shown in FIGS. 1 and 2, the main body 20 of this embodiment is formed in a substantially cylindrical shape with both the upstream side and the downstream side open and the liquid flow path 21 provided inside, and the downstream side thereof. The opening forms the one-end opening 23. The end surface of the main body 20 on the one end opening 23 side forms a valve seat 25 to which the valve body 40 comes into contact with and separates. Further, as shown in FIG. 1, from the peripheral edge of the opening 23 at one end of the main body 20, the diameter is larger than the outer diameter of the valve body 40, and a notch 27a is provided in a predetermined range in the circumferential direction. , A diameter-expanded portion 27 having a substantially C-shaped ring shape is provided. As shown in FIG. 2, the enlarged diameter portion 27 is arranged outside the valve body 41, which will be described later, of the valve body 40 in a state where one end opening 23 of the main body portion 20 is closed to protect the valve body 40. It is a part to do.

Further, as shown in FIGS. 1 and 3, a pair of ribs 29 extending in a long plate shape are located on the outer periphery of the main body 20 on the downstream side and at a position consistent with the notch 27a of the enlarged diameter portion 27. , 29 are arranged in parallel with each other at predetermined intervals so as to be in the direction along the axis C1 of the main body portion 20.

From the downstream end of the pair of ribs 29, 29, and from the outer surface side thereof (the side opposite to the facing surface of the pair of ribs 29, 29), columnar support shafts 31, 31 are formed. Each is projected. Further, from the tip of each support shaft 31, a protrusion 33 is provided so as to project toward the downstream side in the axial direction of the main body 20. The protrusion 33 is arranged outside the bearing portion 45 of the valve body 40 in a state where the support shaft 31 is inserted into the bearing portion 45 of the valve body 40 and the valve body 40 is pivotally supported by the main body portion 20 so as to be openable and closable. The support shaft 31 is prevented from coming off from the bearing portion 45 (see FIG. 2).

A first support portion that supports one end 61 of the coil spring 60 is formed on the outer periphery of the main body portion 20.

As shown in FIG. 3, the first support portion in this embodiment is a position of each rib 29 near the upstream end portion of the main body portion 20 when the valve device 10 is viewed from the plane direction. A spring support plate 35 arranged orthogonally to the axial center C1 (see FIG. 4) of the main body 20 between the pair of ribs 29, 29, and the spring support plate 35 from the downstream end surface of the main body 20. It is composed of a columnar spring support pin 37 extending so as to be parallel to the direction along the axis C1 of the main body portion 20.

Then, the spring support pin 37 is inserted into the inner circumference of one end 61 of the coil spring 60, and the end face of the one end 61 comes into contact with the spring support plate 35, so that one end 61 of the coil spring 60 is supported. (See Figures 2-4).

The first support portion may be, for example, a tubular wall portion having a bottomed tubular shape that covers the outer periphery of one end of the coil spring 60 (the spring support pin may not be provided), or one end 61 of the coil spring 60 is received. It may be a recess, and is not particularly limited as long as it can support one end 61 of the coil spring 60.

Further, as shown in FIGS. 2 and 4, the main body portion 20 is a portion of the coil spring 60 that bends when the valve body is opened with the valve body 40 closed with respect to the one end opening 23 of the main body portion 20. It has a guide wall 39 arranged between the outer circumference of the coil spring 60 and the outer circumference side of the main body 20 so as to face the bent portion 65 (see FIG. 6) described later. The guide wall 39 in this embodiment is located between the pair of ribs 29 and 29 and is arranged on the outer peripheral side of the main body portion 20 of the spring support pin 37, such as the spring support plate 35 which is the first support portion. It has a long plate shape that extends longer than the tip of the spring support pin 37.

Next, a valve body 40 that can be opened and closed and attached to the main body portion 20 having the above configuration will be described.

As shown in FIGS. 1 and 2, the valve body 40 of this embodiment has a substantially disk shape suitable for one end opening 23 of the main body 20, and is brought into contact with and separated from the valve seat 25 to open and close the one end opening 23. It has a valve body 41 to be used.

As shown in FIGS. 2 and 5, the valve body 41 is provided with a pair of bearing arms 43, 43 which are bent in a substantially L shape and have a bearing portion 45 on the tip end side thereof. Each bearing arm 43 is fixed to the surface side of the valve body 41 (the side opposite to the sealing surface with respect to the valve seat 25), and has a base portion 43a protruding from the outer peripheral edge portion of the valve body 41 by a predetermined length and the base portion 43a. It is composed of an extension portion 43b that is bent at a right angle so as to form an L shape with respect to the valve body 41 and extends so as to protrude from the seal surface side of the valve body 41. Further, the base portions 43a, 43a of the pair of bearing arms 43, 43 are connected to each other by a support wall portion 47 having an L-shaped cross section (see FIG. 4). The pair of bearing arms 43, 43 are arranged so as to enter the notch portion 27a provided in the diameter-expanded portion 27 of the main body portion 20 in a state where one end opening 23 of the main body portion 20 is closed by the valve body 40. (See Fig. 2).

A hole-shaped bearing portion 45 is formed at the tip of the extension portion 43b of each bearing arm 43 in the extension direction. As shown in FIGS. 5 and 8, the bearing portion 45 has an introduction opening 49 into which the support shaft 31 can be introduced, and the introduction opening 49 has an opening 23 at one end of the main body 20 as a valve body 40. The valve body 40 is opened on the sealing surface side in the closed state. Therefore, the support shaft 31 is configured to fit into the bearing portion 45 by pushing the support shaft 31 into the introduction opening 49 of the bearing portion 45 from the sealing surface side of the valve body 40.

Further, as shown in FIG. 5, the introduction opening 49 is arranged so as to be biased toward the axis C1 of the main body 20 when viewed from the axial direction of the support shaft 31. Further, the introduction opening 49 is formed with a narrow portion 49a that narrows the inner diameter thereof (see FIG. 5) so that the support shaft 31 fitted to the bearing portion 45 can be prevented from coming off through the introduction opening 49. It has become.

Further, as shown in FIG. 2, the extending portions 43b, 43b of the pair of bearing arms 43, 43 are provided with expanding portions 51, 51 extending outward so as to be separated from each other at the tip portions in the extending direction. ing. A gap 51a is formed in each of the expanded portions 51, and a protrusion 33 provided on the support shaft 31 can pass through the gap 51a.

Further, as shown in FIGS. 2 and 3, a pair of side walls 53 and 53 extending at right angles to the surface direction of the valve body 41 and extending parallel to each other are fixed to the support wall portion 47.

The valve body 40 is formed with a second support portion that supports the other end 63 of the coil spring 60.

As shown in FIGS. 3 and 4, the second support portion in this embodiment is located at the end of the pair of side walls 53, 53 in the direction protruding from the surface side of the valve body 41 in the surface direction of the valve body 41. The spring support plate 55, which is arranged parallel to the spring support plate 55, extends parallel to the direction along the axis C1 of the main body 20 from the inner surface side of the spring support plate 55, and the spring support of the first support portion. It is composed of a columnar spring support pin 57 arranged so as to face the pin 37.

Then, the spring support pin 57 is inserted into the inner circumference of the other end 63 of the coil spring 60, and the end face of the other end 63 comes into contact with the spring support plate 55 so that the other end 63 of the coil spring 60 is supported. (See Figures 2 to 4).

As described above, in this embodiment, one end 61 of the coil spring 60 is supported by the first support portion, and the other end 63 is supported by the second support portion, so that the coil spring 60 is supported by the one end opening 23 of the main body portion 20. Is closed by the valve body 40, and its axis C2 is arranged so as to be parallel to the axis C1 of the main body 20 (see FIGS. 3 and 4).

The second support portion may be, for example, a tubular wall portion having a bottomed tubular shape that covers the outer periphery of the other end of the coil spring 60, or a recess that receives the other end 63 of the coil spring 60. As long as the other end 63 of the coil spring 60 can be supported, there is no particular limitation.

Further, as shown in FIGS. 2 and 4, the valve body 40 faces the bent portion 65 (see FIG. 6) of the coil spring 60 in a state where the valve body 40 is closed with respect to the one end opening 23 of the main body portion 20. As such, it has a guide wall 59 arranged between the outer circumference of the coil spring 60 and the outer circumference side of the main body 20. The guide wall 59 in this embodiment is located between the pair of side walls 53, 53 and is arranged on the outer peripheral side of the main body 20 of the spring support pin 57, and is the second support plate 55 and the spring support plate 55. It has a long plate shape that extends longer than the tip of the spring support pin 57.

In this embodiment, the guide walls 39 and 59 are provided on both the main body 20 and the valve body 40, but a guide wall may be provided on either the main body 20 or the valve body 40. Good.

In the valve body 40 having the above structure, the valve body 40 can be opened and closed with respect to the one end opening 23 of the main body 20 by inserting the support shaft 31 of the main body 20 into the bearing portion 45 through the introduction opening 49. (See FIGS. 4 to 7). Then, as shown in FIGS. 4 and 5, when viewed from the axial direction of the support shaft 31, the second support portion (spring support plate 55 and spring support pin 57) is located at one end opening 23 of the main body portion 20. On the other hand, in a state where the valve body 40 is closed, it is arranged on the outer diameter side of the main body 20 with respect to the support shaft 31.

On the other hand, as described above, the coil spring 60, which is a spring member that urges the valve body 40 toward the opening 23 at one end of the main body 20, has a first support portion (the spring support plate 35 and the spring support plate 35). It is supported by the spring support pin 37), and the other end 63 is supported by the second support portion (spring support plate 55 and spring support pin 57).

Further, in this embodiment, the coil spring 60 is in a compressed state, and both ends 61 and 63 are supported by the first support portion and the second support portion, so that the coil spring 60 can be compressed and deformed. Due to the accompanying restoring force (restoring force when the compressed coil spring tries to return to its original length, hereinafter referred to as "compressive restoring force"), the second support portion of the valve body 40 is directed toward the downstream side of the main body portion 20. (See arrow F1 in FIG. 4), and this compressive restoring force creates a moment M around the support shaft 31 (see FIG. 4), resulting in a valve body pivotally supported by the support shaft 31. The 40 is urged by the moment M in a closing direction toward one end opening 23 of the main body 20 (see arrow F2 in FIG. 4), and the sealing surface of the valve main body 41 comes into contact with the valve seat 25 to bring the main body. One end opening 23 of the portion 20 is closed (see FIGS. 4 and 5).

However, the coil spring 60 does not have to be supported by the first support portion and the second support portion in the compressed state, and is compressed when the valve body 40 is opened with respect to the one end opening 23 of the main body portion 20. It suffices if the valve body 40 can be urged in the closing direction toward the opening 23 at one end. That is, when the valve body 40 opens with respect to the one end opening 23 of the main body 20, the coil spring 60 is compression-deformed, or the bent portion 65 between the one end 61 and the other end 63 is flexed and deformed as described later. Therefore (see FIG. 6), the valve body 40 is urged in the closing direction toward the opening 23 at one end by the elastic restoring force.

As shown in FIG. 5, in a state where the valve body 40 is openably and closably attached to the main body portion 20, the support shaft 31 is engaged with the inner peripheral edge portion of the narrow portion 49a of the introduction opening 49 of the bearing portion 45. Although it is designed to be stopped and prevented from coming off, the locking force between the inner peripheral edge portion of the narrow portion 49a and the support shaft 31 is set to be larger than the compression restoration force of the coil spring 60, and the support shaft is set. 31 is prevented from coming off from the introduction opening 49.

Then, as shown in FIGS. 4 and 5, in a state where one end opening 23 of the main body 20 is closed by the valve body 40, the axis C2 of the coil spring 60 is relative to the axis C1 of the main body 20. It extends straight in a straight line so as to be parallel, but as shown in FIGS. 6 and 7, when the valve body 40 is open with respect to one end opening 23 of the main body 20, the shaft of the coil spring 60 The heart C2 is configured to bend. Here, with one end opening 23 of the main body 20 closed by the valve body 40, the axial center C2 of the coil spring 60 extends linearly and is parallel to the axial center C1 of the main body 20. (See FIGS. 4 and 5), but when the valve body 40 is open with respect to the opening 23 at one end of the main body 20, the portion 65 (bending portion 65) between one end 61 and the other end 63 of the coil spring 60. ) Is configured to bend with respect to the axis C1 of the main body 20 (see FIGS. 6 and 7).

When the coil spring 60 is flexed and deformed in this way, an elastic restoring force is generated in which the bent portion 65 tries to return to the original straightened state. Therefore, this elastic restoring force is applied to the valve body 40 in the closing direction. It is possible to act as a force.

In this regard, the support shaft 31 of the main body 20 and the bearing portion 45 of the valve body 40 are the first support portions (as shown in FIGS. 4 and 5) when viewed from the axial direction of the support shaft 31. Here, it is arranged in the region E between the spring support pin 37) and the second support portion (here, the spring support pin 57). Further, a portion (bending portion 65) of the coil spring 60 that bends when the valve body is opened is arranged in this region E (see FIGS. 4 and 5).

Further, in this embodiment, the support shaft 31 is provided in the main body 20 and the bearing portion 45 is provided in the valve body 40, but the bearing portion may be provided in the main body portion and the support shaft may be provided in the valve body.

Next, the procedure for assembling the valve device 10 of the present invention having the above configuration and the operation and effect will be described.

That is, one end 61 of the coil spring 60 is pushed toward the spring support pin 37 of the main body 20, the spring support pin 37 is inserted into the inner circumference of one end 61 of the coil spring 60, and the end surface of one end 61 of the coil spring 60 is inserted. By abutting, one end 61 of the coil spring 60 is supported by the first support portion.

Next, the introduction openings 49, 49 of the pair of bearing portions 45, 45 of the valve body 40 are aligned with the pair of support shafts 31, 31 on the main body portion 20 side, and the second end 63 of the coil spring 60 is seconded. The spring support pins 57 of the support portion are aligned and arranged, and in that state, the valve body 40 is pushed into the main body portion 20 (see FIG. 8).

Then, the support shaft 31 is inserted into the introduction opening 49 of the bearing portion 45, the bearing portion 45 is expanded from the inside, the protrusion 33 passes through the gap 51a of the expansion portion 51, and the coil spring. The spring support pin 57 of the second support portion is inserted into the inner circumference of the other end 63 of the 60.

Then, when the support shaft 31 passes through the narrow portion 49a, the bearing portion 45 elastically returns, the support shaft 31 is received in the bearing portion 45, and the support shaft 31 fits into the bearing portion 45 and expands. The protrusion 33 inserted from the gap 51a of the opening 51 is arranged outside the bearing portion 45, and the valve body 40 can be attached to the main body portion 20 so as to be openable and closable (see FIG. 2).

Further, in this state, the end surface of the other end 63 of the coil spring 60 comes into contact with the spring support plate 55 and is supported by the second support portion, so that it is combined with the coil spring 60 one end 61 supported by the first support portion. Both ends 61 and 63 of the coil spring 60 are supported, and the coil spring 60 can be assembled to the valve device 10.

As described above, in the valve device 10, the valve body 40 can be attached to the main body portion 20 by pivotally supporting the support shaft 31 on the bearing portion 45, and the valve body can be attached to the valve body from one end opening 23 of the main body portion 20. When the 40 is opened, the spring member for urging the valve body 40 toward the opening 23 at one end is composed of the coil spring 60. Therefore, one end 61 of the coil spring 60 is supported by the first support portion, and the like. The coil spring 60, which is a spring member, can be assembled by a simple operation of supporting the end 63 on the second support portion, and the assembly workability of the valve device 10 can be improved.

Further, in this embodiment, as shown in FIG. 8, both ends 61 and 63 of the coil spring 60 arranged in parallel with the direction along the axial center C1 of the main body 20 are the first support portion and the second support portion. By pushing the support shaft 31 into the introduction opening 49 of the bearing portion 45 from the sealing surface side of the valve body 40 (here, pushing in the direction along the axis C1 of the main body portion 20). Since the support shaft 31 is configured to fit into the bearing portion 45, the work of assembling the coil spring 60 and the work of attaching the valve body 40 can be performed in the same direction along the axis C1 of the main body portion 20. It is possible to perform automatic assembly work by machine.

Then, in the valve device 10, fuel is supplied from the pipe P (see FIG. 4) with the valve body 40 closed to the one end opening 23 of the main body 20 (see FIGS. 4 and 5). Since the valve body 41 of the valve body 40 is pushed by the fluid pressure, the valve body 40 rotates via the support shaft 31 and the bearing portion 45 against the urging force of the coil spring 60, and the valve body 41 The sealing surface is separated from the valve seat 25, and fuel is refueled into a fuel tank (not shown) from one end opening 23 of the main body 20 (see FIGS. 6 and 7).

At this time, as shown in FIGS. 6 and 7, the axis C2 of the coil spring 60 (here, the axis C2 in the bent portion 65) with the valve body 40 open with respect to the one end opening 23 of the main body 20. Is configured to bend, so when the valve body 40 is closed from the open state, in addition to the compression restoration force in the valve body closing direction due to the compressive force of the coil spring 60, the bent portion 65 of the coil spring 60 is the original. The elastic restoring force that tries to return to the shape can act as an urging force in the valve body closing direction, and the valve body 40 can be firmly closed with respect to the one end opening 23 of the main body portion 20.

Further, in this embodiment, the support shaft 31 of the main body 20 and the bearing portion 45 of the valve body 40 are of the coil spring 60 when viewed from the axial direction of the support shaft 31, as shown in FIGS. 4 and 5. Since the bending portion 65 is arranged in the region E between the first support portion (here, the spring support pin 37) and the second support portion (here, the spring support pin 57), the coil spring 60 is bent. The portion 65 and the rotation center of the valve body 40 can be easily brought close to each other, and the valve body 40 can be smoothly rotated.

Further, in this embodiment, as shown in FIG. 3, the coil spring 60 has an axial center C2 of the main body 20 in a state where one end opening 23 of the main body 20 is closed by the valve body 40. Since the valve device 10 is arranged so as to be parallel to the valve device 10, the valve device 10 can be made compact, and the urging force in the valve body closing direction due to the compression restoration force of the coil spring 60 can be efficiently applied.

Further, in this embodiment, as shown in FIG. 4, in the main body 20 and the valve body 40, the valve body of the coil spring 60 is opened with the valve body 40 closed with respect to the one end opening 23 of the main body 20. It has guide walls 39 and 59 arranged between the outer circumference of the coil spring 60 and the outer circumference side of the main body 20 so as to face the bent portion 65 at the time. Therefore, as shown in FIG. 6, it is possible to prevent the bent portion 65 of the coil spring 60 from being excessively deformed when the valve body 40 is opened with respect to the one end opening 23 of the main body portion 20.

Further, in this embodiment, as shown in FIGS. 4 and 5, the second support portion (spring support plate 55 and spring support pin 57) is the main body portion 20 when viewed from the axial direction of the support shaft 31. Since the valve body 40 is arranged on the outer diameter side of the main body portion 20 with respect to the support shaft 31 in a state where the valve body 40 is closed with respect to the one-end opening 23 of the valve body 40 It is possible to prevent the valve body 40 from becoming an obstacle and reliably urge the valve body 40 in the direction of closing the one end opening 23 of the main body 20.

The present invention is not limited to the above-described embodiments, and various modified embodiments are possible within the scope of the gist of the present invention, and such embodiments are also included in the scope of the present invention. ..

10 Flap valve device (valve device)
20 Main body 21 Flow path 23 One end opening 31 Support shaft 35 Spring support plate (first support)
37 Spring support pin (first support part)
40 Valve body 45 Bearing part 49 Introduction opening 55 Spring support plate (second support part)
57 Spring support pin (second support part)
59 Guide wall 60 Coil spring 61 One end 63 One end 65 Bent part (a part that bends between one end and the other end)

Claims (8)

A tubular body with a liquid flow path inside,
A flap-shaped valve body that can be opened and closed at one end of the main body,
When the valve body opens from one end opening of the main body, a spring member that urges the valve body in a closing direction toward the one end opening.
A pair of support shafts provided on one of the main body and the valve body, and a pair of support shafts provided on the main body or the other of the valve body, and each support shaft can be accepted to open and close the valve body with respect to the main body. It has a pair of bearings that support the shaft.
The spring member is composed of a coil spring.
A first support portion that supports one end of the coil spring is formed on the outer periphery of the main body portion.
The valve body is formed with a second support portion that supports the other end of the coil spring.
The flap valve device is characterized in that the coil spring is arranged between the pair of bearing portions. A tubular body with a liquid flow path inside,
A flap-shaped valve body that can be opened and closed at one end of the main body,
When the valve body opens from one end opening of the main body, a spring member that urges the valve body in a closing direction toward the one end opening.
A support shaft provided on one of the main body or the valve body and a shaft provided on the other of the main body or the valve body so as to accept the support shaft and open and close the valve body with respect to the main body. It has a bearing part to support,
The spring member is composed of a coil spring.
A first support portion that supports one end of the coil spring is formed on the outer periphery of the main body portion.
The valve body is formed with a second support portion that supports the other end of the coil spring.
A pair of ribs are arranged on the outer periphery of the main body portion, the first support portion is formed between these ribs, and the support shaft or the bearing portion is provided on the outer surface side of each rib. A flap valve device characterized by that. The flap valve device according to claim 1 or 2, wherein the axis of the coil spring is bent in a state where the valve body is opened with respect to one end opening of the main body portion. The support shaft or the bearing portion is formed by the first support portion and the second support portion on which a portion of the coil spring that bends when the valve body is opened is arranged when viewed from the axial direction of the support shaft. The flap valve device according to claim 3, which is arranged in the area between them. Any of claims 1 to 4, wherein the coil spring is arranged so that the axis of the coil spring is parallel to the axis of the main body in a state where one end opening of the main body is closed by the valve body. The flap valve device according to one. The bearing portion has an introduction opening into which the support shaft can be introduced, and the introduction opening is on the seal surface side of the valve body with one end opening of the main body portion closed by the valve body. Is open to
The flap according to claim 5, wherein the support shaft is fitted into the bearing portion by pushing the support shaft into the introduction opening of the bearing portion from the sealing surface side of the valve body. Valve device. The main body and / or the valve body of the coil spring so as to face a portion of the coil spring that bends when the valve body is opened with the valve body closed with respect to one end opening of the valve body. The flap valve device according to claim 3 or 4, which has a guide wall arranged between the outer periphery and the outer peripheral side of the main body portion. When viewed from the axial direction of the support shaft, the second support portion has an outer diameter of the main body portion that is larger than that of the support shaft in a state where the valve body is closed with respect to one end opening of the main body portion. The flap valve device according to any one of claims 1 to 7, which is arranged on the side.

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