JP7227061B2 - vent valve - Google Patents

Description

The present invention relates to vent valves.

If a negative pressure is generated in the drain pipe, there is a risk that the water seal of the drain equipment connected to the drain pipe will be broken. Therefore, it has been conventionally recommended to provide a drain pipe with a vent valve that opens when the internal pressure becomes negative. The vent valve includes a valve body and biasing means for biasing the valve body in a closing direction, and is configured to open the valve body when the internal pressure becomes lower than the external pressure. When a negative pressure is generated in the drain pipe, the valve element of the vent valve opens to introduce outside air, thereby protecting the water seal of the drain device.

The valve body of the vent valve is preferably arranged to open immediately upon the occurrence of negative pressure. On the other hand, the valve body of the vent valve is stably closed while maintaining airtightness in normal times when there is no negative pressure so that the odor of the drain pipe does not leak to the outside, and when the negative pressure is released It is preferably configured to close immediately. The valve body of the vent valve is required to have opening and closing characteristics that allow it to open and close in response to a slight change in pressure.

Patent Literature 1 discloses a vent valve provided with a coil spring as biasing means for biasing the valve body in the closing direction. A coil spring is an inexpensive biasing means, but if dust accumulates around the coil spring after long-term use, the coil spring will not expand and contract smoothly, and the valve body may not open smoothly when negative pressure is generated. be.

Patent Document 2 discloses a vent valve provided with a pair of magnets that repel each other as biasing means for biasing the valve body in the closing direction.

JP 2014-74483 A JP 2018-165537 A

However, in the vent valve disclosed in Patent Document 2, if the repulsive force of both magnets is weak, it is difficult to stably maintain the closed state of the valve body while maintaining airtightness in normal times. However, simply increasing the repulsive force of both magnets cannot smoothly open the valve body when negative pressure is generated. In the vent valve described above, it was not always possible to obtain desirable opening/closing characteristics of the valve body.

The present invention has been made in view of the above points, and its object is to provide a vent valve that is stably closed while maintaining airtightness in normal times and smoothly opened when negative pressure is generated.

A first vent valve according to the present invention includes a vent valve body having a vent formed thereon, and the vent valve so as to be movable between a closed position for closing the vent and an open position for opening the vent. A valve body supported by a valve body and a biasing member biasing the valve body toward the closed position are provided. When the direction of the valve body from the closed position to the open position is defined as an opening direction, and the direction from the open position to the closed position is defined as a closing direction, the biasing member is provided on the valve body. a first magnet, a second magnet provided in the vent valve main body, arranged on the opening direction side with respect to the first magnet, and providing a repulsive force to the first magnet; and a second magnet provided in the vent valve main body. and an attracting body made of a magnetic material or a magnet, which is disposed on the closing direction side with respect to the first magnet, and which exerts an attracting force on the first magnet.

A second vent valve according to the present invention includes a vent valve body having a vent formed thereon, and the vent valve so as to be movable between a closed position for closing the vent and an open position for opening the vent. A valve body supported by a valve body and a biasing member biasing the valve body toward the closed position are provided. The biasing member is provided on the vent valve main body when the direction of the valve body from the closed position to the open position is defined as the opening direction, and the direction from the open position to the closed position is defined as the closing direction. a first magnet provided in the valve body, a second magnet arranged on the closing direction side with respect to the first magnet, and providing a repulsive force to the first magnet; and a second magnet provided in the valve body, and an attracting body made of a magnetic material or a magnet, which is arranged on the side of the opening direction with respect to the first magnet and which exerts an attracting force on the first magnet.

According to the first and second vent valves, the first magnet receives a repulsive force from the second magnet and an attractive force from the attracting body. Therefore, even if the mutual repulsive force of the first magnet and the second magnet is set to be relatively weak, the valve body can be sufficiently biased in the closing direction, and the valve body can be kept airtight during normal operation. can be stably maintained in a closed state. On the other hand, when negative pressure is generated, once the valve body opens the vent and the distance between the first magnet and the attracting body increases, the attracting force of the attracting body decreases. Therefore, the valve body can be moved more quickly when negative pressure is generated, compared to simply increasing the repulsive forces of the first magnet and the second magnet. Therefore, it is possible to realize a vent valve that is stably closed under normal conditions while maintaining airtightness and that is smoothly opened when negative pressure is generated.

In the first vent valve, the valve body has a closing portion that covers the vent and a shaft portion that extends in the closing direction from the closing portion, and is movable along the axial direction of the shaft portion. may be supported by the vent valve main body. The first magnet is provided on the stem portion of the valve body, the second magnet is positioned toward the closing portion of the valve body with respect to the first magnet, and the attracting body is attached to the first magnet. On the other hand, the valve body may be arranged on the opposite side of the closing portion.

According to a preferred aspect of the present invention, the attraction body is arranged at a position spaced apart from the first magnet when the valve body closes the vent, and the tip of the shaft portion of the valve body is: The valve body is spaced apart from the vent valve body when the vent is closed.

According to the above aspect, when the valve body closes the vent, the first magnet and the attracting body do not come into contact with each other, and the tip of the shaft portion of the valve body does not come into contact with the vent valve main body. Therefore, no sound is generated due to contact. Therefore, it is possible to prevent abnormal noise from being generated when the valve body closes the vent. In addition, if the valve body is designed to close the vent at the position where the attracting body contacts the first magnet or the position where the tip of the shaft of the valve body contacts the vent valve body, the valve body or the vent valve body If there is a dimensional error, the suction body may contact the first magnet or the tip of the shaft of the valve body may contact the vent valve main body before the valve body closes the vent port. As a result, the valve body may not be able to close the vent well in normal times. However, according to the above aspect, there is no such fear, and even if some dimensional error occurs, the vent can be satisfactorily closed normally.

According to a preferred aspect of the present invention, the first magnet is annularly formed so as to surround the shaft portion of the valve body. The second magnet and the attracting body are annularly formed. The centers of the first magnet, the second magnet, and the attracting body are located on the same straight line.

According to the above aspect, the shaft portion of the valve body can easily move linearly, and the opening and closing operation of the valve body is stabilized. Therefore, the vent can be smoothly opened and closed.

According to a preferred aspect of the present invention, the vent valve main body includes a first component having the vent formed thereon, and a second component detachably attached to the first component. The second magnet is provided on the first part and the attracting body is provided on the second part.

According to the above aspect, the vent valve can be easily assembled by attaching the second part to the first part after attaching the valve body to the first part.

According to a preferred aspect of the present invention, the force received by the first magnet from the second magnet and the attracting body is such that the valve body is in the closed position. It is set to gradually decrease and then gradually increase when moving from the open position to the open position.

According to the above aspect, desirable opening/closing characteristics of the valve body can be obtained. That is, it is possible to obtain suitable opening/closing characteristics because it is stably closed while maintaining airtightness in normal times, and smoothly opened when negative pressure is generated.

According to the present invention, it is possible to provide a vent valve that is stably closed under normal conditions while maintaining airtightness and that is smoothly opened when negative pressure is generated.

It is a perspective view of the vent valve which concerns on embodiment. FIG. 4 is a plan view of the vent valve; Fig. 2 is a front view of the vent valve; Fig. 3 is a left side view of the vent valve; Fig. 10 is a bottom view of the vent valve; FIG. 3 is a cross-sectional view of the vent valve taken along the line VI-VI of FIG. 2; FIG. 3 is a cross-sectional view of the vent valve and tubing taken along line VII-VII of FIG. 2; FIG. 4 is a perspective view of the main body of the vent valve body; FIG. 3 is a perspective view of the main body of the valve body; It is a perspective view of an outflow port cover. It is a sectional view of an outflow port cover. FIG. 4 is a cross-sectional view of the vent valve and tubing prior to rotating the cover; FIG. 10 is a plan view showing an example of cover rotation work; It is a graph which shows the relationship between the distance from the vent of a valve body, and the force which a 1st magnet receives from a 2nd magnet and an attraction|suction body. (a) is a partial cross-sectional view of a vent valve according to another embodiment, and (b) is a plan view of the valve body of the vent valve and the main body of the vent valve body. (a) is a partial cross-sectional view of a vent valve according to another embodiment, and (b) is an exploded cross-sectional view of the vent valve. FIG. 11 is a partial cross-sectional view of a vent valve according to another embodiment;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a vent valve 1 according to this embodiment. 2, 3, 4 and 5 are a plan view, a front view, a left side view and a bottom view of the vent 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 vent valve 1 is attached to the pipe 100 (see FIG. 7) of the drain pipe, and when 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 body 5 (see FIG. 1), a valve body 50 (see FIG. 6), and a biasing member 60 (see FIG. 6) that biases the valve body 50. As shown in FIG.

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

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

An assembly groove 14 is formed in the outer peripheral surface of the outer cylindrical portion 11 . A 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 projection 25 is inserted and an inclined upper edge 14b. The upper edge 14b is inclined downward with distance from the insertion hole 14a. In this embodiment, three assembly grooves 14 are formed on the outer peripheral surface of the outer cylinder portion 11 .

A shaft hole 15 into which a shaft portion 52 of a valve body 50 (to be described later) is inserted is formed in the inner cylindrical portion 12 . The inner tubular portion 12 is arranged concentrically with the outer tubular portion 11 .

The connecting rod 13 extends from the inner tubular portion 12 to the outer tubular portion 11 . Although the number of connecting rods 13 is four here, it 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 curved when viewed along the axis CA. For example, the connecting rod 13 may be spirally formed. In this embodiment, the connecting rod 13 is formed in a plate shape. A surface 13a of the connecting rod 13 is inclined with respect to a line 19 parallel to the axis CA. A surface 13a of the connecting rod 13 is inclined downward toward one side of the circumferential direction (clockwise direction around the axis CA in FIG. 8; see arrow Q).

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

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

9 is a perspective view of the main body 53 of the valve body 50. FIG. As shown in FIG. 9, the closing portion 51 of the body 53 is circular when viewed along the axis CA. The shaft portion 52 is cylindrical and extends upward from the closing 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 against the valve seat 16 via a seal member 54, and a cylindrical portion 51b that extends downward from the annular portion 51a. The rigidity of the closing portion 51 is enhanced by providing the cylindrical portion 51b.

The sealing material 54 is formed in a plate-like and annular shape, and is arranged on the annular portion 51 a of the closing portion 51 . Although the material of the sealing member 54 is not particularly limited, it is, for example, rubber such as EPDM (ethylene propylene rubber). The pressing member 55 is fitted on the shaft portion 52 and presses the sealing member 54 from above toward the closing portion 51 . Thereby, the sealing member 54 is fixed to the closing portion 51 . However, the configuration described here is only an example. The pressing member 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 side 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 arranged above the air vent 17 . The inflow-side cylindrical portion 21 extends axially from the top plate portion 22 . Inside the inflow-side tubular portion 21, the aforementioned projection 25 that is fitted into the assembly groove 14 of the main body 10 is provided. By fitting the projections 25 into the assembly grooves 14, the cover 20 is assembled to the main body 10 with the sealing material 18 interposed therebetween, as shown in FIG. As shown in FIG. 3, an inflow port 27 is formed in the inflow side tubular portion 21 . The inlet 27 is arranged above the vent 17 . In this embodiment, the inlet 27 is opened sideways. That is, the inlet 27 opens in a direction perpendicular to the axis CA. However, the position and orientation of the inlet 27 are not particularly limited.

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

Outlet cover 30 is attached to the lower portion of main body 10 . FIG. 10 is a perspective view of the outlet cover 30. FIG. 11 is a sectional view of the outlet cover 30. FIG. As shown in FIG. 10 , the outflow port cover 30 has an outflow-side cylindrical 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 outflow port 37 opens vertically. The outflow port 37 is arranged below the vent 17 .

The water intrusion suppressing portion 32 is a portion that suppresses the intrusion of the waste water flowing inside the pipe 100 when the waste water splashes up (see arrow A1 in FIG. 7). The water intrusion suppressing portion 32 is a portion extending radially inward, and is composed of a plurality of fins 33 in this embodiment. The fins 33 extend radially inward from the outflow-side tubular portion 31 . As shown in FIG. 5 , in the present embodiment, the inner diameter R32 of the water entry suppressing portion 32 is defined by the distance from the axis CA to the inner ends of the fins 33 . An inner diameter R32 of the water entry suppressing portion 32 is smaller than an 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 spaced apart from each other in the circumferential direction. The fins 33 are inclined with respect to a line 37d parallel to the centerline 37c of the outlet 37. As shown in FIG. Further, the fins 33 are inclined with respect to a plane (a horizontal plane in this embodiment) perpendicular to the center line 37c. Therefore, when the air passes between the adjacent fins 33, the direction of air flow is oblique to the center line 37c (see arrow A2 in FIGS. 10 and 11). In this embodiment, the center line 37c of the outflow port 37 coincides with the axis CA.

As shown in FIG. 5, when viewed along the centerline 37c of the outlet 37, the fins 33 are circumferentially spaced from each other. However, it is not limited. When viewed along the centerline 37c of the outlet 37, the fins 33 may not be circumferentially spaced from each other, and the fins 33 may partially overlap each other. In this embodiment, since the fins 33 are spaced apart when viewed along the center line 37c of the outlet 37, a slit hole 33g is formed between the fins 33. As shown in FIG. Here, the slit hole 33g is not a hole with a closed periphery, but a hole with an open periphery (portion on the side of the center line 37c). As used herein, the term "pore" includes both pores with a closed periphery and pores with a partially open periphery. In this embodiment, when viewed along the center line 37c of the outflow port 37, the area of the water intrusion suppressing portion 32 is larger than the opening area of the slit hole 33g. That is, when viewed along the center line 37c of the outlet 37, the overall area of the fins 33 is larger than the overall opening area of the slit holes 33g. The opening area of the slit hole 33g referred to here is the opening area when it is assumed that the center line 37c side of the slit hole 33g is closed.

Although the material of the vent valve body 5 and the valve body 50 is not particularly limited, here, the material of the body 10 and the cover 20 of the vent valve body 5 is ABS resin, and the material of the outlet cover 30 is PP (polypropylene) resin. be. The material of the body 53 of the valve body 50 and the pressing part 55 is ABS resin.

The biasing member 60 is a member that biases the valve body 50 in the direction to close the vent 17 . In this 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 biasing member 60 is configured to bias the valve body 50 upward. In this embodiment, the biasing member 60 is configured to bias the valve body 50 using magnetic force. As shown in FIG. 7, the biasing 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. 5, and a suction body 63 provided on the cover 20 of No. 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 this annular member 56 . Note that the annular member 56 is not necessarily required, 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 are aligned.

The second magnet 62 is attached to the inner cylindrical 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 towards the closing portion 51 of the valve body 50 with respect to the first magnet 61 . The second magnet 62 is also annularly formed. As shown in FIG. 7 , the shaft portion 52 of the valve body 50 passes through the second magnet 62 . The second magnet 62 is arranged so that the center line of the second magnet 62 and the axis CA are aligned. The second magnet 62 is configured to give repulsive force to the first magnet 61 . The first magnet 61 and the second magnet 62 are configured such that their facing surfaces have the same polarity.

The attracting body 63 is a member that applies an attracting force to the first magnet 61 . Although the attracting body 63 is made of metal in this embodiment, the attracting body 63 may be a magnet. Also, the attracting body 63 may be a magnetic material other than metal. In this embodiment, the suction body 63 is configured by an annular metal plate. The attracting body 63 is attached to the top plate portion 22 of the cover 20 and arranged above the first magnet 61 . The attracting body 63 is arranged with respect to the first magnet 61 on the opposite side of the closing portion 51 of the valve body 50 . The suction body 63 is arranged so that the center line of the suction body 63 and the axis CA are aligned.

The above is the configuration of the vent valve 1 . Next, 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 from the biasing member 60 . Therefore, the valve body 50 closes the vent 17 normally when no negative pressure is generated in the pipe 100 .

When 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 greater than the upward force exerted by the biasing member 60, the valve body 50 moves downward. As a result, the vent 17 is opened. When vent 17 is opened, outside air passes through inlet 27 , vent 17 and outlet 37 and is introduced into pipe 100 . In this manner, air is introduced into the pipe 100 from the outside by opening the vent valve 1 .

The introduction of air into the pipe 100 increases the internal pressure of the pipe 100 . This eliminates the negative pressure state. 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 biasing member 60 . As a result, the valve body 50 moves upward and the vent 17 is closed.

Thus, even if negative pressure is generated in the pipe 100 by providing the pipe 100 with the vent valve 1 , the negative pressure state is immediately eliminated by opening the vent valve 1 .

Next, a method for assembling the vent valve 1 will be described. As described above, the vent valve 1 includes the vent valve main body 5 and the valve body 50 , and the vent valve main body 5 has the main body 10 , the cover 20 and the 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. As shown in FIG. Next, the outlet cover 30 is attached to the lower part of the main body 10 . 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 projections 25 (see FIG. 1) of the cover 20 fit into the insertion holes 14a of the main body 10. As shown in FIG. Thereby, the vent valve 1 is assembled. It does not matter which of the attachment of the cover 20 to the main body 10 and the attachment of the outlet cover 30 to the main body 10 comes first.

Next, an example of a method for installing the vent valve 1 will be described. As shown in FIG. 12 , the pipe 100 is provided with a tubular attachment port 101 for attaching the vent valve 1 . First, the vent valve 1 is inserted into the mounting port 101 . Next, the cover 20 is rotated. At this time, as shown in FIG. 13, for example, a tool such as a screwdriver 200 may be hooked on the hook bar 23 to rotate the cover 20. As shown in FIG. Thereby, 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 shown in FIG. As a result, the cover 20 rotates and moves downward, crushing the sealing member 18 (see FIG. 7). In this manner, the vent valve 1 is airtightly attached to the attachment port 101 .

At the time of maintenance or replacement of the vent valve 1, the vent valve 1 can be removed from the mounting port 101 and the vent valve 1 can be disassembled in the reverse order of the above description. By the way, if the vent valve 1 is attached to the attachment port 101 for a long period of time, the cover 20 may become 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 the 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 vent valve 1 can be easily performed.

As described above, the vent valve 1 according to this embodiment includes the first magnet 61, the second magnet 62, and the attracting body 63 as means for urging the valve body 50 in the direction to close the vent 17. A member 60 is provided. FIG. 14 is a graph showing the relationship between the distance L of the valve body 50 from the vent 17 and the force F that the first magnet 61 receives from the second magnet 62 and the attracting body 63 . The distance L is zero when the valve body 50 closes the vent 17, and increases with distance from the vent 17 (in this embodiment, downward from the vent 17). A dashed curve B2 represents the repulsive force that the first magnet 61 receives from the second magnet 62 . A dashed-dotted curve B3 represents the attractive force that the first magnet 61 receives from the attractive body 63 . A solid curve B1 represents the resultant force of the repulsive force and the attractive force. In other words, the solid curve B1 represents the total force that the first magnet 61 receives from the second magnet 62 and the attracting body 63 .

As can be seen from the curve B1, the force received by the first magnet 61 gradually decreases as the distance L increases between zero and L1, and gradually increases as the distance L increases beyond L1. That is, the first magnet 61, the second magnet 62, and the attracting body 63 are released after the force acting on the first magnet 61 gradually decreases when the valve body 50 moves from the closed position toward the open position. It is set to increase gradually.

By providing the attracting body 63 , the force F<b>1 that the first magnet 61 receives when L=0 is greater than the force F<b>2 that the first magnet 61 receives from the second magnet 62 . Therefore, the biasing member 60 according to the present embodiment sufficiently biases the valve body 50 in the closing direction. The valve body 50 is stably maintained in a closed state while maintaining airtightness.

By the way, even if the attracting body 63 is not provided, the force that the first magnet 61 receives when L=0 can be increased by setting the repulsive forces of the first magnet 61 and the second magnet 62 relatively high. . A curve B4 represents the force that the first magnet 61 receives when the repulsive force is set high. However, if the repulsive forces of the first magnet 61 and the second magnet 62 are simply set higher, the force that the first magnet 61 receives will only increase as the distance L increases.

On the other hand, according to the present embodiment, the force that the first magnet 61 receives decreases as the distance L increases, and then increases. Therefore, once the valve element 50 is separated from the vent hole 17 by receiving the negative pressure, it quickly moves in the opening direction thereafter. Therefore, according to this embodiment, outside air can be immediately introduced into the pipe 100 .

As described above, according to the vent valve 1 according to the present embodiment, the first magnet 61 provided on the shaft portion 52 of the valve body 50 receives a repulsive force from the second magnet 62 provided on the vent valve main body 5. At the same time, it receives a suction force from a suction body 63 provided on the vent valve main body 5 . Therefore, even if the mutual repulsive force of the first magnet 61 and the second magnet 62 is set to be relatively weak, the valve body 50 can be sufficiently urged in the closing direction, and thus the airtightness is normally maintained. The closed state of the valve body 50 can be stably maintained while maintaining the same. On the other hand, once the closing portion 51 of the valve body 50 is separated from the vent port 17 when negative pressure is generated, the suction force of the suction body 63 is reduced. Therefore, the valve body 50 can be moved quickly when the negative pressure is generated, compared to simply increasing the repulsive forces of the first magnet 61 and the second magnet 62 . Therefore, it is possible to realize the vent valve 1 that is stably closed in a state where airtightness is maintained at normal times and smoothly opened when a negative pressure is generated.

According to this embodiment, as shown in FIGS. 6 and 7, when the valve body 50 closes the vent 17, the attracting body 63 is arranged at a position spaced apart from the first magnet 61, and the valve body 50 The tip of the shaft portion 52 is arranged at a position separated from the top plate portion 22 of the vent valve main body 5 . Therefore, when the vent 17 is closed, the valve body 50 moves upward toward the top plate portion 22 , but the attraction body 63 does not hit the first magnet 61 and the shaft portion 52 does not hit the top plate portion 22 . do not have. Therefore, it is possible to prevent the sound from being generated when the valve body 50 closes the vent 17 .

Moreover, the valve body 50 and the vent valve main body 5 are configured by assembling a plurality of parts. The valve body 50 and the vent valve main body 5 are more likely to have dimensional errors than when they are composed of a single component. If the valve body 50 is designed to close the vent hole 17 at the position where the attracting body 63 contacts the first magnet 61 or the tip of the shaft portion 52 of the valve body 50 contacts the vent valve main body 5 If a dimensional error occurs in the valve body 50 or the vent valve main body 5 , the attracting body 63 contacts the first magnet 61 or the tip of the shaft portion 52 of the valve body 50 comes into contact with the first magnet 61 before the valve body 50 closes the vent port 17 . may come into contact with the vent valve main body 5. As a result, the valve body 50 may not be able to close the vent 17 satisfactorily during normal operation. However, according to the present embodiment, there is no such fear, and even if some dimensional error occurs, the vent 17 can be satisfactorily closed normally.

However, this embodiment is only an example, and the shaft portion 52 is in contact with the top plate portion 22 when the valve body 50 closes the vent port 17 as long as the vent port 17 can be satisfactorily closed at normal times. Alternatively, the attracting body 63 may be in contact with the first magnet 61 . A sound may be generated when the valve body 50 closes the vent 17 .

According to this embodiment, the first magnet 61 is annularly formed so as to surround the shaft portion 52 of the valve body 50, and the second magnet 62 and the attracting body 63 are also annularly formed. The first magnet 61, the second magnet 62, and the attracting body 63 are arranged on the axis CA and positioned on the same straight line. As a result, the shaft portion 52 of the valve body 50 becomes easier to move linearly, and the opening/closing operation of the valve body 50 is stabilized. Therefore, the vent 17 can be smoothly opened and closed.

According to this embodiment, the vent valve body 5 includes a body 10 having a vent 17 formed therein and a cover 20 detachably attached to the body 10 , and the second magnet 62 is provided on the body 10 . , the suction body 63 is provided on the cover 20 . Accordingly, the vent valve 1 can be easily assembled by attaching the cover 20 to the main body 10 after attaching the valve body 50 to the main body 10 of the vent valve main body 5 .

In addition, although the first magnet 61, the second magnet 62, and the attracting body 63 are formed in an annular shape in the above-described embodiment, they are not particularly limited. The first magnet 61, the second magnet 62, or the attracting body 63 may be disc-shaped, or may be formed in another shape.

In the above embodiment, the first magnet 61 is arranged around the shaft portion 52 of the valve body 50 . However, the arrangement of the first magnets 61 is not particularly limited. For example, the first magnet 61 may be arranged at the tip of the shaft portion 52 (above the shaft portion 52).

In the above embodiment, the distance between the first magnet 61 and the attracting body 63 is smaller than the distance between the first magnet 61 and the second magnet 62 when the valve body 50 closes the vent 17 . However, the distance between the first magnet 61 and the attracting body 63 may be equal to the distance between the first magnet 61 and the second magnet 62, or may be greater than the distance between the first magnet 61 and the second magnet 62. good.

Next, examples of other embodiments will be briefly described. In the following description, portions similar or corresponding to those in the above-described embodiment are denoted by the same reference numerals, and description thereof will be omitted.

Although the valve body 50 has the shaft portion 52 in the above embodiment, the shaft portion 52 is not necessarily required. Next, an example of an embodiment in which the valve body 50 does not have a shaft will be briefly described with reference to FIG. 15 .

As shown in FIG. 15B, in this embodiment, the valve body 50 has a closing portion 51 and a plurality of protrusions 57 extending radially outward from the outer peripheral portion of the closing portion 51 . The main body 10 of the vent valve main body 5 is formed with a recess 57b with which the projection 57 is engaged. The projection 57 is slidable with respect to the recess 57b and is guided vertically by the recess 57b. As shown in FIG. 15( a ), the first magnet 61 is attached to the closing portion 51 of the valve body 50 . The second magnet 62 is attached to a portion of the vent valve body 5 below the first magnet 61 . The attracting body 63 is attached to a portion of the vent valve main body 5 above the first magnet 61 . Here, the second magnet 62 is attached to the main body 10 and the attracting body 63 is attached to the cover 20 .

Also in this embodiment, the first magnet 61 receives an upward repulsive force from the second magnet 62 and an upward attractive force from the attracting body 63 . Therefore, normally, the valve body 50 receives an upward force and closes the vent 17 . On the other hand, when negative pressure is generated, the downward force acting on the valve body 50 becomes greater than the upward force, and the valve body 50 moves downward. As a result, the valve body 50 opens the vent 17 . In this embodiment, the protrusion 57 of the valve body 50 slides in the concave portion 57b of the vent valve main body 5, thereby guiding the valve body 50 in the vertical direction.

In the above embodiment, the vent 17 is vertically opened and the valve body 50 is configured to move vertically. The opening direction of the vent 17 and the movement direction of the valve body 50 are the same. However, the opening direction of the vent 17 and the movement direction of the valve body 50 do not necessarily match. For example, in the embodiment shown in FIG. 16 , the vent valve body 5 has an umbrella-shaped vent forming member 80 and the valve body 50 has an umbrella-shaped closing portion 51 . A plurality of vent holes 17 are formed in the vent forming member 80, and each vent hole 17 opens in a direction inclined from the vertical direction. The first magnet 61 is attached to the valve body 50 , the second magnet 62 is attached to the body 10 of the vent valve body 5 , and the attracting body 63 is attached to the cover 20 of the vent valve body 5 . The valve body 50 is provided with a cylindrical shaft portion 52 , and the cover 20 is provided with a shaft portion 20 a that engages with the shaft portion 52 . The valve body 50 is guided vertically by the shaft portion 52 sliding along the shaft portion 20 a of the cover 20 . In this embodiment, the opening direction of the vent 17 is tilted from the vertical direction, but the valve body 50 moves in the vertical direction.

In the above embodiment, the first magnet 61 is provided on the valve body 50 and the second magnet 62 and the attracting body 63 are provided on the vent valve main body 5 . However, for example, as shown in FIG. 17, the first magnet 61 may be provided on the vent valve main body 5 and the second magnet 62 and the attracting body 63 may be provided on the valve body 50 . In the embodiment shown in FIG. 17 , a first magnet 61 is provided on the vent forming member 80 of the vent valve main body 5 . The valve body 50 has an annular member 56 fitted over the shaft portion 52 , and the second magnet 62 is provided on this annular member 56 . The suction body 63 is provided on the closing portion 51 of the valve body 50 .

In this embodiment, the first magnet 61 receives a downward repulsive force from the second magnet 62 and a downward attractive force from the attractor 63 . In other words, the second magnet 62 receives upward repulsive force from the first magnet 61 , and the attracting body 63 receives upward attractive force from the first magnet 61 . Therefore, normally, the valve body 50 receives an upward force and closes the vent 17 formed in the vent forming member 80 . On the other hand, when negative pressure is generated, the downward force acting on the valve body 50 becomes greater than the upward force, and the valve body 50 moves downward. As a result, the valve body 50 opens the vent 17 .

1 vent valve 5 vent valve main body 10 main body (first part)
20 cover (second part)
17 Vent 50 Valve body 51 Closing part 52 Shaft part 60 Biasing member 61 First magnet 62 Second magnet 63 Attracting body

Claims (7)

a vent valve body in which a vent is formed;
a valve body supported by the vent valve body so as to be movable between a closed position for closing the vent and an open position for opening the vent;
a biasing member that biases the valve body toward the closed position;
When the direction of the valve body from the closed position to the open position is defined as an opening direction, and the direction from the open position to the closed position is defined as a closing direction,
The biasing member is
a first magnet provided on the valve body;
a second magnet provided in the vent valve main body, arranged on the opening direction side with respect to the first magnet, and applying a repulsive force to the first magnet;
an attracting body that is provided in the vent valve main body, is arranged on the side of the closing direction with respect to the first magnet, and is made of a magnetic material or a magnet that exerts an attracting force on the first magnet. valve. a vent valve body in which a vent is formed;
a valve body supported by the vent valve body so as to be movable between a closed position for closing the vent and an open position for opening the vent;
a biasing member that biases the valve body toward the closed position;
When the direction of the valve body from the closed position to the open position is defined as an opening direction, and the direction from the open position to the closed position is defined as a closing direction,
The biasing member is
a first magnet provided on the vent valve body;
a second magnet provided in the valve body, arranged on the closing direction side with respect to the first magnet, and applying a repulsive force to the first magnet;
a vent valve provided on the valve body, arranged on the side of the opening direction with respect to the first magnet, and made of a magnetic material or a magnet that exerts an attractive force on the first magnet. . The valve body has a closing portion that covers the vent and a shaft portion that extends in the closing direction from the closing portion, and is supported by the vent valve main body so as to be movable along the axial direction of the shaft portion. ,
The first magnet is provided on the shaft portion of the valve body,
said second magnet is positioned towards said closing portion of said valve body with respect to said first magnet;
2. The vent valve of claim 1, wherein the attracting body is positioned opposite the closing portion of the valve body with respect to the first magnet. The attracting body is arranged at a position spaced apart from the first magnet when the valve body closes the vent,
4. The vent valve according to claim 3, wherein the tip of the shaft portion of the valve body is arranged at a position spaced apart from the vent valve main body when the valve body closes the vent port. The first magnet is annularly formed so as to surround the shaft portion of the valve body,
The second magnet and the attracting body are formed in an annular shape,
5. The vent valve of claim 3 or 4, wherein the centers of the first magnet, the second magnet and the attractant are collinear. The vent valve main body includes a first part in which the vent hole is formed, and a second part detachably attached to the first part,
A vent valve according to any one of claims 3 to 5, wherein the second magnet is provided on the first part and the attractant is provided on the second part. The first magnet, the second magnet, and the attracting body are such that the force that the first magnet receives from the second magnet and the attracting body moves the valve body from the closed position toward the open position. 7. A vent valve according to any one of claims 1 to 6, which is set to gradually decrease and then gradually increase.

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