JP2020172963A - Ventilation valve - Google Patents

Abstract

To provide a ventilation valve which can hardly cause malfunction of a valve body due to turbulence of an air current inside.SOLUTION: A ventilation valve 1 includes: a ventilation valve body 5 which is formed with an inflow port 27, an outflow port 37, and a ventilation port 17 provided in the middle of an air passage from the inflow port 27 to the outflow port 37; a valve body 50 that is movably supported by the ventilation valve body 5 and covers the ventilation port 17 so as to open/close; an energizing member 60 which energizes the valve body 50 in a direction closing the ventilation port 17; and a straightening mechanism 13 which is provided on the ventilation valve body 5 or the valve body 50, and straightens air flowing inside the ventilation valve body 5 so as to swivel around a center axis of the valve body 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vent valve.

If negative pressure is generated in the drainage pipe, the sealing of the drainage equipment connected to the drainage pipe may be broken. Therefore, it has been conventionally recommended to provide a ventilation valve in the drainage pipe that opens when the inside becomes negative pressure. By providing a ventilation valve in the drainage pipe line, outside air can be introduced from the ventilation valve when negative pressure is generated, and the negative pressure state can be eliminated. This makes it possible to protect the water seal of the drainage device.

For example, Patent Document 1 discloses such a vent valve. The vent valve disclosed in Patent Document 1 includes a vent that opens up and down, a valve body that can move up and down so as to open and close the vent, and an urging that urges the valve body in the closing direction (upward direction). It is provided with means, an inflow port provided above the vent, and an outflow port provided below the vent. When a negative pressure is generated in the pipe, the valve body is pulled downward by the negative pressure and the vent is opened. Air passes through the inlet, vent, and outlet in that order and is introduced into the pipe. As a result, the negative pressure state of the pipe is eliminated.

Japanese Unexamined Patent Publication No. 2014-74483

When the vent is opened, an air flow is generated inside the vent valve from the inlet to the outlet. At this time, if the air flow is disturbed, an unstable force acts on the valve body. As a result, the opening / closing operation of the valve body may not be performed smoothly.

The present invention has been made in view of this point, and an object of the present invention is to provide a ventilation valve in which malfunction of the valve body is unlikely to occur due to turbulence of the internal air flow.

The vent valve according to the present invention has a vent valve body in which an inlet, an outlet, and a vent provided in the middle of an air passage from the inlet to the outlet are formed, and the vent. A valve body movably supported by the vent valve body so as to be openable and closable, an urging member that urges the valve body in a direction of closing the vent, and the vent valve body or the valve body are provided. It is provided with a rectifying mechanism that rectifies the air flowing inside the ventilation valve body so as to swirl around the center line of the valve body.

According to the above-mentioned vent valve, when a negative pressure is generated, the valve body is pulled, and the vent body is opened by the movement of the valve body. Air flows through the inlet, vent, and outlet in that order. At this time, the air is rectified by the rectifying mechanism so as to swirl around the center line of the valve body. Therefore, the force acting on the valve body is stable, and the valve body can move smoothly. Therefore, the opening / closing operation of the valve body is smoothly performed, and the valve body is unlikely to malfunction.

According to a preferred embodiment of the present invention, the valve body has a closing portion that covers the vent so as to be openable and closable, and a shaft portion that extends from the closing portion. It extends along the centerline of the valve body.

According to the above aspect, the air is rectified by the rectifying mechanism so as to swirl around the axis of the shaft portion of the valve body. Therefore, the force acting on the valve body is stable, and the valve body can easily move smoothly along the axial direction. Therefore, the opening and closing operation of the valve body is performed smoothly, and the valve body is unlikely to malfunction.

It is preferable that the vent and the outlet are open in a direction along the center line of the valve body.

According to a preferred aspect of the present invention, the vent valve main body is arranged inside the outer cylinder portion and the outer cylinder portion, and is formed with a shaft hole through which the shaft portion of the valve body is inserted. It has a portion, and a plurality of connecting rods extending from the inner cylinder portion to the outer cylinder portion so as to connect the inner cylinder portion and the outer cylinder portion and arranged apart from each other in the circumferential direction. There is. The surface of the connecting rod is inclined with respect to a line parallel to the axis of the shaft portion. At least a part of the rectifying mechanism is composed of the connecting rod.

According to the above aspect, the connecting rod rectifies the air so as to swirl around the axis of the shaft portion of the valve body. As a result, the opening and closing operation of the valve body is smoothly performed.

According to a preferred aspect of the present invention, the vent valve is provided on the valve body, extends outward in the radial direction from the center line of the valve body, and has a plurality of ribs arranged apart from each other in the circumferential direction. Have. The surface of the rib is inclined with respect to a line parallel to the center line of the valve body. At least a part of the rectifying mechanism is composed of the ribs.

According to the above aspect, the ribs provided on the valve body rectify the air so as to swirl around the center line of the valve body. As a result, the opening and closing operation of the valve body is smoothly performed.

According to a preferred aspect of the present invention, the vent valve body extends in the direction of a top plate portion arranged perpendicular to the center line of the valve body and the center line of the valve body from the top plate portion. It has an inflow side tubular portion. The inflow port is formed in the inflow side tubular portion. A plurality of straightening vanes extending outward in the radial direction and arranged apart from each other in the circumferential direction are formed on the surface of the top plate portion on the valve body side. At least a part of the rectifying mechanism is composed of the rectifying plate.

According to the above aspect, the air is rectified so as to swirl around the center line of the valve body by the rectifying plate provided on the top plate portion of the vent valve body. As a result, the opening and closing operation of the valve body is smoothly performed.

According to the present invention, it is possible to provide a ventilation valve in which malfunction of the valve body is unlikely to occur due to turbulence of the internal air flow.

It is a perspective view of the ventilation valve which concerns on embodiment. It is a top view of a vent valve. It is a front view of a vent valve. It is a left side view of a vent valve. It is a bottom view of a vent valve. FIG. 2 is a sectional view taken along line VI-VI of FIG. 2 of the vent valve. FIG. 2 is a sectional view taken along line VII-VII of FIG. 2 for a vent valve and piping. It is a perspective view of the main body of a vent valve main body. It is a perspective view of the main body of a valve body. It is a perspective view of the outlet cover. It is sectional drawing of the outlet cover. It is sectional drawing of the ventilation valve and a pipe before rotating a cover. It is a top view which shows an example of the rotation work of a cover. It is a top view of the main body of a vent valve main body. FIG. 14 is a sectional view taken along line XV-XV of FIG. It is a perspective view of the valve body of the ventilation valve which concerns on another embodiment. It is a back view of the top plate part of the ventilation valve which concerns on another embodiment. It is sectional drawing of the ventilation valve which concerns on other embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of the ventilation valve 1 according to the present embodiment. 2, FIG. 3, FIG. 4, and FIG. 5 are a plan view, a front view, a left side view, and a bottom view of the ventilation valve 1, respectively. 6 is a sectional view taken along line VI-VI of FIG. 2, and FIG. 7 is a sectional view taken along line VII-VII of FIG. The ventilation valve 1 is attached to a pipe 100 (see FIG. 7) of a drainage pipe, and when a negative pressure is generated in the pipe 100, the negative pressure state is eliminated by introducing outside air.

The vent valve 1 includes a vent valve main body 5 (see FIG. 1), a valve body 50 (see FIG. 6), and an urging member 60 (see FIG. 6) for urging the valve body 50.

As shown in FIG. 1, the vent valve main body 5 includes a main body 10, a cover 20, and an outlet cover 30. The vent valve main body 5 is configured by assembling the main body 10, the cover 20, and the outlet cover 30 together.

FIG. 8 is a perspective view of the main body 10. The main body 10 has an outer cylinder portion 11, an inner cylinder portion 12 arranged inside the outer cylinder portion 11, and a plurality of connecting rods 13 for connecting the outer cylinder portion 11 and the inner cylinder portion 12. ..

An assembly groove 14 is formed on the outer peripheral surface of the outer cylinder portion 11. The protrusion 25 (see FIG. 1) of the cover 20 is fitted into the assembly groove 14. The assembly groove 14 has an insertion hole 14a into which the protrusion 25 is inserted and an inclined upper edge 14b. The upper edge 14b is inclined so as to move downward as the distance from the insertion hole 14a increases. In the present embodiment, three assembly grooves 14 are formed on the outer peripheral surface of the outer cylinder portion 11.

The inner cylinder portion 12 is formed with a shaft hole 15 into which the shaft portion 52 of the valve body 50, which will be described later, is inserted. The inner cylinder portion 12 is arranged concentrically with the outer cylinder portion 11.

The connecting rod 13 extends from the inner cylinder portion 12 to the outer cylinder portion 11. Here, the number of connecting rods 13 is 4, but the number is not particularly limited. In this embodiment, the connecting rods 13 are arranged radially. The connecting rod 13 extends straight in the radial direction when viewed along the axis CA. However, it is not particularly limited. The connecting rod 13 may be bent when viewed along the axis CA. For example, the connecting rod 13 may be formed in a spiral shape. In the present embodiment, the connecting rod 13 is formed in a plate shape. The surface 13a of the connecting rod 13 is inclined with respect to the line 19 parallel to the axis CA. The surface 13a of the connecting rod 13 is inclined downward toward one of the circumferential directions (clockwise around the axis CA in FIG. 8, see arrow Q).

As shown in FIG. 7, the upper portion 11a of the outer cylinder portion 11 has an inner diameter smaller than that of the lower portion 11b, and a step is formed between the upper portion 11a and the lower portion 11b. This step constitutes a valve seat 16 that receives the valve body 50. A vent 17 opened and closed by the valve body 50 is formed inside the valve seat 16. The vent 17 is open in the vertical direction.

The valve body 50 has a main body 53 having a closing portion 51 and a shaft portion 52, a sealing material 54, and a pressing component 55 that presses the sealing material 54 against the main body 53.

FIG. 9 is a perspective view of the main body 53 of the valve body 50. As shown in FIG. 9, the closed portion 51 of the main body 53 is formed in a circular shape when viewed along the axis CA. The shaft portion 52 is formed in a columnar shape and extends upward from the closed portion 51. The closing portion 51 and the shaft portion 52 are integrally formed. As shown in FIG. 7, the closing portion 51 includes an annular portion 51a that abuts on the valve seat 16 via the sealing material 54, and a tubular portion 51b that extends downward from the annular portion 51a. Since the tubular portion 51b is provided, the rigidity of the closed portion 51 is increased.

The sealing material 54 is formed in a plate shape and an annular shape, and is arranged on the annular portion 51a of the closing portion 51. The material of the sealing material 54 is not particularly limited, and is, for example, rubber such as EPDM (ethylene propylene rubber). The pressing component 55 is fitted in the shaft portion 52, and presses the sealing material 54 from above toward the closing portion 51. As a result, the sealing material 54 is fixed to the closed portion 51. However, the configuration described here is only an example. The pressing component 55 may be omitted by adhering the sealing material 54 to the closing portion 51 or the like. If the annular portion 51a of the closing portion 51 has sufficient sealing performance, the sealing material 54 may be omitted.

The cover 20 serves as a cover that covers the upper part of the vent 17. As shown in FIG. 1, the cover 20 has an inflow side tubular portion 21 that engages with the outer tubular portion 11 of the main body 10 and a top plate portion 22. The top plate portion 22 is provided perpendicular to the axis CA and is arranged above the vent 17. The inflow side tubular portion 21 extends in the axial direction from the top plate portion 22. The above-mentioned protrusion 25 that is fitted into the assembly groove 14 of the main body 10 is provided inside the inflow side tubular portion 21. By fitting the protrusion 25 into the assembly groove 14, the cover 20 is assembled to the main body 10 with the sealing material 18 interposed therebetween, as shown in FIG. 7. As shown in FIG. 3, an inflow port 27 is formed in the inflow side tubular portion 21. The inflow port 27 is arranged above the vent 17. In this embodiment, the inflow port 27 is open to the side. That is, the inflow port 27 opens in the direction perpendicular to the axis CA. However, the position and orientation of the inflow port 27 are not particularly limited.

As shown in FIG. 1, the cover 20 has two hook rods 23 integrally formed on the top plate portion 22. The two hook rods 23 are arranged on opposite sides of the axis CA. The hook rod 23 extends upward from the top plate portion 22. Further, the top plate portion 22 is provided with a reinforcing rib 24. The reinforcing rib 24 is connected to the hook rod 23 and the top plate portion 22.

The outlet cover 30 is attached to the lower part of the main body 10. FIG. 10 is a perspective view of the outlet cover 30. FIG. 11 is a cross-sectional view of the outlet cover 30. As shown in FIG. 10, the outlet cover 30 has an outflow side tubular portion 31 and a water intrusion suppressing portion 32. An outflow port 37 is formed on the lower side of the outflow side tubular portion 31. The outlet 37 is open in the vertical direction. The outlet 37 is arranged below the vent 17.

The water intrusion suppressing unit 32 is a portion that prevents the drainage from entering the inside when the drainage flowing in the pipe 100 jumps up (see arrow A1 in FIG. 7). The water intrusion suppressing portion 32 is a portion extending inward in the radial direction, and is composed of a plurality of fins 33 in the present embodiment. The fin 33 extends inward in the radial direction from the outflow side tubular portion 31. As shown in FIG. 5, in the present embodiment, the inner diameter R32 of the water intrusion suppressing portion 32 is defined by the distance from the axis CA to the inner end of the fin 33. The inner diameter R32 of the water intrusion suppressing portion 32 is smaller than the outer diameter R51 of the closing portion 51 of the valve body 50.

As shown in FIG. 10, the fins 33 are separated from each other. The fins 33 are arranged along the circumferential direction and are separated from each other in the circumferential direction. The fin 33 is inclined with respect to the line 37d parallel to the center line 37c of the outlet 37. Further, the fins 33 are inclined with respect to a plane perpendicular to the center line 37c (horizontal plane in the present embodiment). Therefore, when the air passes between the adjacent fins 33, the air flow direction is oblique with respect to the center line 37c (see arrows A2 in FIGS. 10 and 11). In the present embodiment, the center line 37c of the outlet 37 coincides with the axis CA.

As shown in FIG. 5, when viewed along the center line 37c of the outlet 37, the fins 33 are separated from each other in the circumferential direction. However, it is not limited. When viewed along the center line 37c of the outlet 37, the fins 33 may not be separated from each other in the circumferential direction, and the fins 33 may partially overlap each other. In the present embodiment, since the fins 33 are separated from each other when viewed along the center line 37c of the outlet 37, a slit hole 33g is formed between the fins 33. Here, the slit hole 33g is not a hole whose circumference is closed, but a hole whose circumference is partially opened (a portion on the center line 37c side). As used herein, the term "hole" includes both a hole with a closed periphery and a hole with a partial periphery. In the present embodiment, the area of the water intrusion suppressing portion 32 is larger than the opening area of the slit hole 33g when viewed along the center line 37c of the outlet 37. That is, when viewed along the center line 37c of the outlet 37, the total area of the fins 33 is larger than the total opening area of the slit holes 33g. The opening area of the slit hole 33g referred to here is an opening area when it is assumed that the center line 37c side of the slit hole 33g is closed.

The materials of the vent valve main body 5 and the valve body 50 are not particularly limited, but here, the material of the main body 10 and the cover 20 of the vent valve main body 5 is ABS resin, and the material of the outlet cover 30 is PP (polypropylene) resin. is there. The material of the main body 53 and the holding component 55 of the valve body 50 is ABS resin.

The urging member 60 is a member that urges the valve body 50 in the direction of closing the vent 17. In the present embodiment, when the valve body 50 moves downward, the vent 17 is opened, and when the valve body 50 moves upward, the vent 17 is closed. The urging member 60 is configured to urge the valve body 50 upward. In the present embodiment, the urging member 60 is configured to urge the valve body 50 by utilizing magnetic force. As shown in FIG. 7, the urging member 60 includes a first magnet 61 provided on the shaft portion 52 of the valve body 50, a second magnet 62 provided on the main body 10 of the vent valve main body 5, and a vent valve main body. It has a suction body 63 provided on the cover 20 of 5.

An annular member 56 made of synthetic resin (made of ABS resin in this embodiment) is fitted in the upper portion of the shaft portion 52 of the valve body 50. The first magnet 61 is attached to the annular member 56. The annular member 56 is not always necessary, and the first magnet 61 may be directly attached to the shaft portion 52. The first magnet 61 is formed in an annular shape. The first magnet 61 is arranged so that the center line of the first magnet 61 and the axis CA coincide with each other.

The second magnet 62 is attached to the inner cylinder portion 12 of the main body 10. The second magnet 62 is arranged below the first magnet 61. In other words, the second magnet 62 is arranged toward the closing portion 51 of the valve body 50 with respect to the first magnet 61. The second magnet 62 is also formed in an annular shape. As shown in FIG. 7, the shaft portion 52 of the valve body 50 penetrates the second magnet 62. The second magnet 62 is arranged so that the center line of the second magnet 62 and the axis CA coincide with each other. The second magnet 62 is configured to give a repulsive force to the first magnet 61. The first magnet 61 and the second magnet 62 are configured so that the facing surfaces have the same polarity.

The attractive body 63 is a member that applies an attractive force to the first magnet 61. In the present embodiment, the attracting body 63 is made of metal, but the attracting body 63 may be a magnet. Further, the suction body 63 may be a magnetic material other than metal. In the present embodiment, the suction body 63 is composed of an annular metal plate. The suction body 63 is attached to the top plate portion 22 of the cover 20 and is arranged above the first magnet 61. The suction body 63 is arranged in the direction opposite to the closing portion 51 of the valve body 50 with respect to the first magnet 61. The suction body 63 is arranged so that the center line of the suction body 63 and the axis line CA coincide with each other.

The above is the configuration of the vent valve 1. Next, the operation of the vent valve 1 will be described.

The first magnet 61 receives a repulsive force from the second magnet 62 and an attractive force from the attracting body 63. Therefore, the first magnet 61 receives an upward force from the second magnet 62 and the attracting body 63. Since the first magnet 61 is attached to the valve body 50, the valve body 50 receives an upward force via the first magnet 61. The valve body 50 receives an upward force by the urging member 60. Therefore, the valve body 50 closes the vent 17 at the normal time when no negative pressure is generated in the pipe 100.

When a negative pressure is generated in the pipe 100, a pressure difference is generated between the upper side and the lower side of the valve body 50. A downward force acts on the valve body 50 due to the pressure difference. When this downward force becomes larger than the upward force of the urging member 60, the valve body 50 moves downward. As a result, the vent 17 is opened. When the vent 17 is opened, external air passes through the inlet 27, the vent 17, and the outlet 37 and is introduced into the pipe 100. By opening the ventilation valve 1 in this way, air is introduced into the pipe 100 from the outside.

When air is introduced into the pipe 100, the internal pressure of the pipe 100 rises. As a result, the negative pressure state is eliminated. When the pressure difference between the upper side and the lower side of the valve body 50 becomes smaller, the downward force acting on the valve body 50 becomes smaller than the upward force exerted by the urging member 60. As a result, the valve body 50 moves upward and the vent 17 is closed.

As described above, since the ventilation valve 1 is provided in the pipe 100, even if a negative pressure is generated in the pipe 100, the negative pressure state is immediately eliminated by opening the ventilation valve 1.

Next, a method of assembling the vent valve 1 will be described. As described above, the vent valve 1 includes a vent valve main body 5 and a valve body 50, and the vent valve main body 5 has a main body 10, a cover 20, and an outlet cover 30. First, the shaft portion 52 of the valve body 50 is inserted from below into the shaft hole 15 (see FIG. 8) of the inner cylinder portion 12 of the main body 10, and the annular member 56 is attached to the tip of the shaft portion 52. Next, the outlet cover 30 is attached to the lower part of the main body 10. Further, an annular sealing material 18 is attached around the main body 10, and the cover 20 is attached to the main body 10 from above so that the protrusion 25 (see FIG. 1) of the cover 20 fits into the insertion hole 14a of the main body 10. As a result, the ventilation valve 1 is assembled. It does not matter which of the cover 20 is attached to the main body 10 and the outlet cover 30 is attached to the main body 10 first.

Next, an example of the installation method of the ventilation valve 1 will be described. As shown in FIG. 12, the pipe 100 is provided with a tubular attachment port 101 for attaching the ventilation valve 1. First, the ventilation valve 1 is inserted into the mounting port 101. Next, the cover 20 is rotated. At this time, for example, as shown in FIG. 13, a tool such as a screwdriver 200 may be hooked on the hook rod 23 to rotate the cover 20. As a result, a large rotational force can be applied to the cover 20. When the cover 20 rotates, the protrusion 25 of the cover 20 moves along the upper edge 14b (see FIG. 8) of the assembly groove 14 of the main body 10. As a result, the cover 20 rotates and moves downward, and the sealing material 18 is crushed (see FIG. 7). In this way, the ventilation valve 1 is airtightly attached to the attachment port 101.

At the time of maintenance or replacement of the ventilation valve 1, the ventilation valve 1 can be removed from the mounting port 101 and the ventilation valve 1 can be disassembled in the reverse order of the above description. By the way, when the ventilation valve 1 is attached to the attachment port 101 for a long period of time, the cover 20 may be stuck and it may be difficult to rotate the cover 20 with respect to the main body 10. However, as described above, if a tool such as a screwdriver 200 is hooked on the hook rod 23, a large rotational force can be applied to the cover 20, so that the cover 20 can be rotated relatively easily. .. Therefore, maintenance or replacement of the ventilation valve 1 can be easily performed.

As described above with reference to FIG. 8, according to the ventilation valve 1 according to the present embodiment, the surface 13a of the connecting rod 13 of the ventilation valve main body 5 is inclined with respect to the line 19 parallel to the axis CA. .. The surface 13a of the connecting rod 13 is inclined downward toward one of the circumferential directions (clockwise around the axis CA in FIG. 8, see arrow Q). FIG. 14 is a plan view of the main body 10 of the vent valve main body 5. FIG. 15 is a cross-sectional view taken along the line XV-XV of FIG. As described above, when the valve body 50 moves downward and the vent 17 is opened, the air introduced from the inflow port 27 passes through the vent 17 and flows out from the outflow port 37. Air flows inside the vent valve main body 5 in the order of the inflow port 27, the vent port 17, and the outflow port 37.

Here, because the surface 13a of the connecting rod 13 is inclined, as shown in FIG. 15, the flow direction of the air flowing in from the inflow port 27 is changed to some extent by the connecting rod 13. As a result, the air is rectified so as to swirl around the axis CA (see arrow A3 in FIGS. 14 and 15). In the present embodiment, the rectifying mechanism is configured by these connecting rods 13.

Therefore, according to the ventilation valve 1 according to the present embodiment, the air flowing inside the ventilation valve main body 5 is rectified so as to swirl around the axis CA of the shaft portion 52 of the valve body 50, so that the ventilation valve main body 5 The turbulence of the airflow inside is suppressed. The force received by the valve body 50 from the airflow is well-balanced and stable. Therefore, the valve body 50 is less likely to swing, and it becomes easier to move smoothly along the axial direction. The opening and closing operation of the valve body 50 is performed smoothly. According to this embodiment, it is possible to realize a ventilation valve 1 in which malfunction of the valve body 50 due to turbulence of the air flow is unlikely to occur.

Further, according to the present embodiment, the vent 17 and the outlet 37 are open in the vertical direction. That is, the vent 17 and the outlet 37 are open in the axial direction. Therefore, the turbulence of the air flow inside the ventilation valve main body 5 can be suppressed to be smaller. Therefore, the opening / closing operation of the valve body 50 is performed more smoothly.

According to the present embodiment, the rectifying mechanism is composed of a connecting rod 13 that connects the outer cylinder portion 11 and the inner cylinder portion 12. The connecting rod 13 plays a role of connecting the outer cylinder portion 11 and the inner cylinder portion 12 and also plays a role of rectifying air. According to the present embodiment, the connecting rod 13 is also used as the rectifying mechanism without adding a new member for rectification. Therefore, it is possible to prevent an increase in the number of parts.

Although one embodiment of the present invention has been described above, the above-described embodiment is only an example, and various other embodiments are possible. Next, another embodiment having a different configuration of the rectifying mechanism will be briefly described.

In the above embodiment, a plurality of fins may be provided on the inner peripheral surface of the outer cylinder portion 11 (see FIG. 8) of the main body 10, and the rectifying mechanism may be configured by these fins.

As shown in FIG. 16, a plurality of ribs 57 may be provided in the closed portion 51 of the valve body 50, and the rectifying mechanism may be configured by these ribs 57. The ribs 57 extend radially outward from the shaft portion 52 and are arranged apart from each other in the circumferential direction. The surface 57a of the rib 57 is inclined with respect to the line 57c parallel to the axis CA. In this embodiment, the holding component 55 is omitted. However, the pressing component 55 may be provided, and the rib 57 may be provided on the pressing component 55. Other configurations are the same as those in the above embodiment. Also in this embodiment, the rectifying mechanism can rectify the air flowing inside the ventilation valve main body 5 so as to swirl around the axis CA of the shaft portion 52. Further, a rotational force is generated in the valve body 50 by the force that the air flowing inside the ventilation valve main body 5 pushes the rib 57. Therefore, the valve body 50 opens and closes while rotating. As a result, the straight running stability of the valve body 50 is improved, and the rotational operation of the valve body 50 is performed more smoothly.

As shown in FIGS. 17 and 18, a plurality of rectifying plates 28 may be provided on the back side (surface on the valve body 50 side) of the top plate portion 22 of the cover 20, and the rectifying mechanism may be configured by these rectifying plates 28. .. The straightening vanes 28 extend outward in the radial direction and are arranged apart from each other in the circumferential direction. As shown in FIG. 17, the straightening vane 28 is formed in a spiral shape. The lower end of the straightening vane 28 is located below the upper end of the inflow port 27. The straightening vane 28 and the inflow port 27 are arranged at positions where they partially overlap each other in the vertical direction. Other configurations are the same as those in the above embodiment. Also in this embodiment, the rectifying mechanism can rectify the air flowing inside the ventilation valve main body 5 so as to swirl around the axis CA of the shaft portion 52.

The above-mentioned rectifying mechanism can be used in combination as appropriate. The above-mentioned connecting rod 13 (see FIG. 14) constituting the rectifying mechanism, the rib 57a provided in the closing portion 51 of the valve body 50 (see FIG. 16), and the rectifying plate 28 provided on the back side of the top plate portion 22 are It may be used alone or in combination of two or more.

Further, the configuration of the rectifying mechanism described above is merely an example, and various other configurations can be adopted as a rectifying mechanism that rectifies the air flowing inside the ventilation valve main body 5 so as to swirl around the axis CA. Is.

1 Ventilation valve 5 Ventilation valve body 11 Outer cylinder part 12 Inner cylinder part 13 Connecting rod 17 Ventilation port 21 Inflow side cylinder part 22 Top plate part 27 Inflow port 28 Rectifying plate 37 Outlet 50 Valve body 51 Closed part 52 Shaft part 57 Rib 60 Ventilation member CA axis

Claims (6)

A vent valve body in which an inlet, an outlet, and a vent provided in the middle of an air passage from the inlet to the outlet are formed.
A valve body movably supported by the vent valve body so as to cover the vent so as to be openable and closable.
An urging member that urges the valve body in the direction of closing the vent, and
A rectifying mechanism provided on the vent valve body or the valve body and rectifying the air flowing inside the vent valve body so as to swirl around the center line of the valve body.
Vent valve with. The valve body has a closed portion that covers the vent so as to be openable and closable, and a shaft portion that extends from the closed portion.
The ventilation valve according to claim 1, wherein the axis of the shaft portion extends along the center line of the valve body. The vent valve according to claim 2, wherein the vent and the outlet are open in a direction along the center line of the valve body. The vent valve main body is arranged inside the outer cylinder portion, the inner cylinder portion having a shaft hole through which the shaft portion of the valve body is inserted, and the inner cylinder portion and the outer cylinder portion. It has a plurality of connecting rods extending from the inner cylinder portion to the outer cylinder portion so as to be connected to the cylinder portion and arranged apart from each other in the circumferential direction.
The surface of the connecting rod is inclined with respect to a line parallel to the axis of the shaft portion.
The vent valve according to claim 2 or 3, wherein at least a part of the rectifying mechanism is composed of the connecting rod. It has a plurality of ribs provided on the valve body, extending outward in the radial direction from the center line of the valve body, and arranged apart from each other in the circumferential direction.
The surface of the rib is inclined with respect to a line parallel to the center line of the valve body.
The vent valve according to any one of claims 1 to 4, wherein at least a part of the rectifying mechanism is composed of the ribs. The vent valve main body has a top plate portion arranged perpendicular to the center line of the valve body, and an inflow side tubular portion extending from the top plate portion in the direction of the center line of the valve body. ,
The inflow port is formed in the inflow side tubular portion, and is formed.
A plurality of straightening vanes extending outward in the radial direction and arranged apart from each other in the circumferential direction are formed on the surface of the top plate portion on the valve body side.
The ventilation valve according to any one of claims 1 to 5, wherein at least a part of the rectifying mechanism is composed of the rectifying plate.

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