JP2023158748A - Check valve - Google Patents

Abstract

To provide a check valve which is simple in a structure, high in durability, and easily automated in assembling.SOLUTION: A check valve 1 has a valve case 2 in which a first opening part 12 and a bearing part 22 are arranged, a valve body 3 having a valve part 31 and a shaft part 32, and a spring 4 for energizing the valve part 31 in a direction in which the first opening part 12 is blocked. The shaft part 32 has a circular columnar part 32a at a tip part side, and a polygonal columnar part 32b at a root part side. In the bearing part 22, a circular hole part 22a for supporting the circular columnar part 32a while face-contacting therewith is formed at a side apart from the first opening part 12, and a polygonal hole part 22b for supporting the polygonal columnar part 32b while face-contacting therewith is formed at a near side. In a valve-closed state, the circular columnar part 32a is slidably fit into the circular hole part 22a, and in a valve-opened state, the polygonal columnar part 32b is slidably fit into the polygonal hole part 22b within a prescribed range in a valve shaft CA direction.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a check valve. Specifically, the present invention relates to a lift-type check valve disposed inside a faucet or the like.

Conventionally, check valves have been disposed inside faucets and the like at locations where there is a possibility of backflow. Some of these check valves include a valve body that closes a valve port from a downstream valve chamber, and a bearing that supports a valve shaft of the valve body so that it can move forward and backward. In such check valves, when the valve is opened, the valve body may rotate around the valve shaft due to the water flow and generate abnormal noise, so a mechanism to prevent rotation may be incorporated. In the check valve of Example 1 disclosed in Patent Document 1, the valve shaft of the valve body is a square shaft with a square cross section, and the square shaft similarly slides in the axial direction of the bearing hole of the bearing into which it fits. Rotation is prevented by making it a square hole with a square cross section that allows for surface contact. In addition, in the check valve of Example 2 disclosed in Patent Document 1, the valve shaft is formed in a cylindrical shape and the bearing is formed in a cylindrical shape, but the end surface of the bearing facing the valve port has irregularities around the circumference. An engaged portion that continues in the direction is provided, and the valve body is provided with a large diameter portion in which an engaging portion that engages with the engaged portion is formed on an end surface on the proximal end side of the valve shaft. When the valve is in the open state, the engaging portion engages with the engaged portion, thereby suppressing rotation of the valve body.

Japanese Patent Application Publication No. 8-49778

Among the above-mentioned conventional techniques, in Example 1, when assembling the check valve, circumferential positioning is required when inserting the valve stem into the bearing, so there is a problem that it is difficult to automate the assembly. Regarding Example 2, if we try to prevent the rotation of the valve body by keeping the axial stroke above a certain level, the shapes of the engaging part and the engaged part will become complicated, and the engaging part and/or the engaged part will become complicated when engaged. There was a problem that the engaging portion was easily damaged.

In view of these problems, an object of the present invention is to provide a check valve that has a simple structure, high durability, and easy to automate assembly.

A first aspect of the present invention is a check valve, which includes an upstream valve port, a valve case provided with a bearing at a position opposite to the valve port, and an umbrella-shaped check valve having a valve portion and a shaft portion. a valve body, and a spring that biases the valve port in a direction to close the valve portion when the shaft portion is slidably inserted in the bearing in the axial direction, and the shaft portion is The tip side is a cylindrical part with a circular cross section, the base side is a polygonal cylindrical part with a polygonal cross section having an inscribed circle that is the same as or larger than the outer diameter of the cylindrical part, and the bearing is connected to the valve port. A circular hole portion is provided on a side far from the valve opening to support the cylindrical portion in surface contact, and a polygonal hole portion is provided on a side closer to the valve port to support the polygonal cylindrical portion in surface contact. The cylindrical part fits into the circular hole in the closed state in which the valve part closes the valve port, and the axial direction in the open state in which the valve part opens the valve port. The polygonal columnar portion is configured to fit into the polygonal hole within a predetermined range.

According to the first invention, the simple structure in which the cross section of the shaft portion of the valve body and the bearing of the valve case is changed in the axial direction between a circular shape and a polygonal shape makes it possible to easily automate the assembly, and the check valve is When the valve is in the open state, the valve body can be prevented from rotating around the valve shaft and generating abnormal noise. Specifically, when assembling the valve body into the valve case, it is only necessary to fit the cylindrical part of the valve body into the circular hole of the bearing, so there is no need for positioning in the circumferential direction and automation is easy. . In addition, the structure is such that the cross-sections of the shaft of the valve body and the bearing of the valve case change from circular to polygonal in the axial direction, making it simple and highly durable so that the valve body and valve case are not easily damaged. I can do it.

A second invention of the present invention is characterized in that, in the first invention, a cross section of the polygonal columnar portion of the shaft portion is a polygon having a hexagonal shape or more.

According to the second invention, when the valve body moves in the axial direction to open the valve and the polygonal columnar portion of the shaft portion fits into the polygonal hole of the bearing, the rotation angle of the polygonal columnar portion with respect to the polygonal hole. Since it only needs to be small, fitting can be performed smoothly.

A third invention of the present invention is characterized in that, in the first invention or the second invention, an end face corner portion of the polygonal columnar portion of the shaft portion on the side of the columnar portion is chamfered. .

According to the third invention, the valve body moves in the axial direction and enters the valve open state, making it easier for the polygonal columnar portion of the shaft portion to fit into the polygonal hole portion of the bearing.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the check valve which is one Embodiment of this invention seen from the upstream direction. It is a perspective view of the check valve in the above-mentioned embodiment seen from the downstream direction. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. Indicates the valve is closed. It is a figure explaining the lid part of the check valve in the said embodiment. The diagram of the hexagon and the circle inscribed in the hexagon is a diagram of the bearing part of the lid part viewed in the axial direction. It is a figure explaining the valve body of the check valve in the said embodiment. The diagram of the hexagon and the circle inscribed in the hexagon is a diagram of the shaft portion of the valve body viewed in the axial direction. 4 is a sectional view showing a half-open valve state corresponding to FIG. 3. FIG. 4 is a sectional view showing a fully open valve state corresponding to FIG. 3. FIG.

A check valve 1 according to an embodiment of the present invention will be described using FIGS. 1 to 7. The check valve 1 is used by being disposed in a water channel in a water faucet (not shown). In each figure, the direction in which water flows when the valve is opened is indicated by an arrow as water flow F.

As shown in FIGS. 1 to 3, the check valve 1 includes a substantially cylindrical valve case 2, a valve body 3 disposed inside the valve case 2, and a space between the valve case 2 and the valve body 3. A spring 4, which is a compression coil spring, is provided.

As shown in FIGS. 1 to 3, the valve case 2 is made of resin and is attached to a substantially cylindrical main body 10 disposed on the upstream side of the water flow F and a downstream opening 11 of the main body 10. It has a substantially disc-shaped lid part 20.

The main body portion 10 has a circular first opening 12 centered on the valve shaft CA when viewed from the direction of the valve shaft CA at the upstream end of the water flow F, and a circular first opening 12 centered on the valve shaft CA at the downstream end of the first opening 12. It has a second opening 13 which is circular and has a smaller diameter than the first opening 12, with the valve axis CA as the center when viewed from the direction. Further, the main body portion 10 has a circular shape centered on the valve shaft CA when viewed from the direction of the valve shaft CA on the downstream side of the second opening portion 13, and has a diameter smaller than the first opening portion 12 and a diameter larger than the second opening portion 13. It has a third opening 14. The space between the first opening 12 and the second opening 13 is formed as a part of the side surface of a cone with the valve axis CA as the central axis and the apex on the downstream side. The space between the second opening 13 and the third opening 14 is formed as a part of the side surface of a cone with the valve axis CA as the central axis and the apex on the upstream side, and this part forms the valve O-ring contact surface 15. It is. A surface extending radially from the third opening 14 perpendicularly to the valve axis CA is an upper valve chamber surface 16. The cylindrical portion from the upper valve chamber surface 16 to the downstream opening 11, which is the downstream opening of the main body portion 10, is the valve chamber R. The intersection of the side surface 17 of the valve chamber R and the upper valve chamber surface 16 is a circular side surface upper end 18 centered on the valve shaft CA when viewed from the direction of the valve shaft CA. On the upstream side of the outer diameter surface S of the main body portion 10, an outer O-ring groove 19 in which the outer O-ring 5 is disposed is provided in a portion between the first opening 12 and the third opening 14 in the direction of the valve shaft CA. It is formed. In the vicinity of the downstream opening 11 on the side surface 17 of the main body portion 10, an engagement convex portion 17a that protrudes radially inward is provided to extend in the circumferential direction. Here, the first opening 12 corresponds to a "valve port" in the claims. Further, the direction of the valve shaft CA corresponds to the "axial direction" in the claims.

As shown in FIGS. 2 to 4, the lid portion 20 includes a cylindrical portion 21 whose outer diameter is the same as the outer diameter of the main body portion 10 and whose central axis is the valve shaft CA, and a cylindrical portion 21 whose central axis is the valve shaft CA. A cylindrical bearing portion 22 disposed inside the valve shaft CA is connected by three connecting portions 23 which extend in the radial direction and are arranged at equal angular intervals around the valve shaft CA. The radial thickness of the cylindrical portion 21 is set to be approximately twice the thickness between the outer diameter surface S of the main body portion 10 and the side surface portion 17. Further, the dimension of the cylindrical portion 21 in the valve axis CA direction is approximately 1/7 of the dimension of the main body portion 10 in the valve axis CA direction. A substantially cylindrical engaging portion 24 extending toward the upstream direction (direction of the main body portion 10) is formed at the radially inner portion of the upstream end surface of the cylindrical portion 21. The radial thickness of the engaging portion 24 is approximately 1/2 of the radial thickness of the cylindrical portion 21, and the dimension of the engaging portion 24 in the valve axis CA direction is the same as the dimension of the cylindrical portion 21 in the valve axis CA direction. It is said to be about the same. The outer diameter of the engaging portion 24 is set to be slightly smaller than the inner diameter of the side surface portion 17 of the main body portion 10, and the outer diameter surface of the engaging portion 24 has an engaging portion recessed radially inward on the side of the cylindrical portion 21. A recess 24a is formed. The engagement concave portion 24a is a portion into which the engagement convex portion 17a is fitted to prevent detachment when the lid portion 20 is attached to the main body portion 10.

As shown in FIGS. 2 to 4, the bearing portion 22 has a substantially cylindrical shape with the valve shaft CA as the central axis. The outer diameter of the bearing portion 22 is approximately 1/3 of the outer diameter of the cylindrical portion 21, and the dimension of the bearing portion 22 in the valve axis CA direction is approximately three times the dimension of the cylindrical portion 21 in the valve axis CA direction. ing. The downstream end surface of the bearing portion 22 is arranged on the same plane as the downstream end surface of the cylindrical portion 21 . In the inner diameter portion of the bearing portion 22, a portion approximately 1/3 of the downstream dimension in the valve axis CA direction (a portion corresponding to the dimension in the valve axis CA direction of the cylindrical portion 21) is formed as a circular hole portion 22a with a circular cross section. It is formed. The inner diameter of the circular hole portion 22a is approximately 1/5 of the outer diameter of the cylindrical portion 21, and is set slightly smaller than the outer diameter of a cylindrical portion 32a of the shaft portion 32 of the valve body 3, which will be described later. A portion of the inner diameter portion of the bearing portion 22 that is about 2/3 of the dimension in the upstream valve axis CA direction is a polygonal hole with a hexagonal cross section whose inscribed circle has the same diameter as the cross-sectional circle of the circular hole portion 22a. It is formed as a portion 22b. The end of the polygonal hole 22b on the side of the circular hole 22a is formed into a hole shape with a chamfered portion 22c in which each hexagonal top is chamfered. The three connecting parts 23 each have a rectangular column shape extending in the radial direction, and the outer diameter surface of the bearing part 22 and the inner diameter surface of the cylindrical part 21 are arranged at angular intervals of 120 degrees when viewed from the valve axis CA direction. It is connected. Specifically, this is a cross section of the connecting portion 23 taken perpendicularly to the radial direction centering on the valve shaft CA, and has a rectangular shape with the long axis direction coinciding with the extending direction of the valve shaft CA. The downstream end surface of the connecting portion 23 is arranged on the same plane as the downstream end surface of the cylindrical portion 21, and the upstream end surface of the connecting portion 23 is arranged on the same plane as the upstream end surface of the cylindrical portion 21. has been done. A gap 25 between each of the connecting portions 23, which has a fan-shaped cross section cut perpendicularly to the valve axis CA and extends in the direction of the valve axis CA, functions as a water flow path. Here, the bearing portion 22 corresponds to a "bearing" in the claims.

As shown in FIGS. 3 and 5, the valve body 3 is made of resin and has a substantially umbrella-like shape, and includes a valve portion 31 corresponding to an umbrella portion and a shaft portion 32 corresponding to a handle portion. . The valve portion 31 has a large diameter portion 31a having a large diameter centered on the valve shaft CA, and a small diameter portion 31b having a small diameter and arranged on the upstream side of the water flow F from the large diameter portion 31a. The outer diameter of the large diameter portion 31a is slightly smaller than the inner diameter of the side surface portion 17 of the valve case 2, and the thickness in the direction of the valve shaft CA is set to be approximately the same as the dimension of the cylindrical portion 21 of the valve case 2 in the direction of the valve shaft CA. There is. A cylindrical convex portion 31d whose center axis is the valve shaft CA is provided on the downstream side of the large diameter portion 31a (on the opposite side from the small diameter portion 31b) for positioning the spring 4. The outer diameter of the small diameter portion 31b is set to be slightly smaller than the inner diameter of the second opening 13 of the valve case 2, and the corner portion of the upstream end is chamfered. A valve O-ring groove 31c into which the valve O-ring 6 is inserted is formed at the end of the outer diameter portion of the small diameter portion 31b on the side of the large diameter portion 31a.

The shaft portion 32 has a columnar shape with the valve shaft CA as its central axis, and its axial dimension is set to be slightly shorter than the axial dimension of the side surface portion 17 of the main body portion 10 of the valve case 2 . The shaft portion 32 is a cylindrical portion 32a having a circular cross section at a portion of about 1/2 of the axial dimension at the tip side in the axial direction, and a cylindrical portion 32a having a circular cross section at a portion of about 1/2 of the axial dimension at the root side of the axial direction. is a hexagonal polygonal columnar portion 32b. Each vertex of the end of the polygonal columnar portion 32b on the side of the columnar portion 32a is chamfered as a chamfered portion 32c. The inscribed circle of the hexagonal cross section of the polygonal columnar section 32b is set to have the same diameter as the circular cross section of the columnar section 32a. A corner portion of the columnar portion 32a at the end opposite to the polygonal columnar portion 32b is chamfered.

As shown in FIG. 3, the valve case 2, valve body 3, and spring 4 are assembled as follows. With the main body 10 of the valve case 2 placed with the first opening 12 on the lower side (upstream side), insert the valve body 3 into the downstream opening 11 from the valve portion 31 side, The valve O-ring 6 is placed in contact with the valve O-ring contact surface 15. Then, the spring 4 is placed inside the convex portion 31d on the upper surface of the large diameter portion 31a of the valve body 3. In this state, the lid part 20 is moved from above (downstream side) so that the cylindrical part 32a of the shaft part 32 of the valve body 3 passes through the inner diameter part of the bearing part 22, and the bearing part The outer diameter surface portions of the engagement portions 24 of 22 are brought into contact with each other, and the engagement convex portions 17a are engaged with the engagement recesses 24a. At this time, the spring 4 is compressed between the large diameter portion 31a of the valve body 3 and the three connecting portions 23 of the lid portion 20, and urges the valve body 3 downward (upstream direction). At this time, the distal end portion of the cylindrical portion 32a of the valve body 3 is fitted into the circular hole 22a of the bearing portion 22 of the valve case 2 so as to be slidable in the direction of the valve shaft CA, and the polygonal columnar portion 32b of the valve body 3 is fitted into the circular hole 22a of the bearing portion 22 of the valve case 2. is not fitted into the polygonal hole 22b of the bearing part 22. This state is the valve closed state.

When water flows in the direction of the water flow F from the closed state shown in FIG. 3, the valve body 3 is pushed in the direction of the water flow F by water pressure, compressing and deforming the spring 4, resulting in the half-open valve state shown in FIG. 6. At this time, the valve O-ring 6 of the valve body 3 is separated from the valve O-ring contact surface 15 of the valve case 2, and the water flowing into the valve chamber R from the gap between the second opening 13 and the small diameter portion 31b is 25 to the outside of the check valve 1. Further, a portion of the polygonal columnar portion 32b on the columnar portion 32a side of the shaft portion 32 of the valve body 3 is fitted into the polygonal hole portion 22b of the bearing portion 22 so as to be slidable in the valve axis CA direction. Rotation relative to the valve case 2 about the axis CA is stopped. When the polygonal columnar part 32b is fitted into the polygonal hole part 22b, the chamfered part 32c contributes to smooth fitting.

When the amount of water flowing in the direction of the water flow F increases from the half-open valve state shown in FIG. 6, the valve body 3 is pushed in the direction of the water flow F by water pressure and moves while compressing and deforming the spring 4. Movement is stopped by the upper surface coming into contact with the lower end surface of the bearing portion 22, resulting in a fully open valve state as shown in FIG. In this fully open valve state, all of the polygonal columnar portions 32b of the shaft portion 32 of the valve body 3 fit into the polygonal hole portions 22b of the bearing portion 22 so as to be slidable in the direction of the valve shaft CA. As a result, rotation with respect to the valve case 2 is stopped. In this state, water flowing into the valve chamber R from the gap between the second opening 13 and the small diameter portion 31b flows to the outside of the check valve 1 through the gap 25. In this state, if the water flow stops for some reason, the valve body 3 enters the closed state as shown in FIG. The flow of water in the opposite direction to the flow of water F is stopped.

The present embodiment configured as described above has the following effects. In the check valve 1, when assembling the valve body 3 to the valve case 2, the valve body 3 is inserted from the valve part 31 side through the downstream opening 11 of the main body part 10, and the valve O-ring 6 is inserted into the valve O-ring. The lid portion 20 may be attached to the main body portion 10 from above so that the cylindrical portion 32a of the valve body 3 passes through the inner diameter portion of the bearing portion 22 while in contact with the contact surface 15. At this time, since the circular hole 22a of the bearing part 22 of the valve case 2 does not need to be aligned in the circumferential direction with respect to the distal end portion of the columnar part 32a of the valve body 3, the position of the valve body 3 relative to the valve case 2 is not necessary. Easy to automate assembly. Furthermore, since the structure is such that the cross section of the outer diameter portion of the shaft portion 32 of the valve body 3 and the cross section of the inner diameter portion of the bearing portion 22 of the valve case 2 are changed into a circular shape and a polygonal shape in the axial direction, it is simple and prevents damage. It can be made to be highly durable and resistant to damage.

Further, since the cross section of the outer diameter portion of the polygonal columnar portion 32b of the shaft portion 32 of the valve body 3 and the cross section of the inner diameter portion of the polygonal hole portion 22b of the bearing portion 22 of the valve case 2 are hexagonal, the valve The body 3 moves in the direction of the valve shaft CA and enters the valve open state, making it easy for the polygonal columnar portion 32b of the shaft portion 32 to fit into the polygonal hole portion 22b of the bearing portion 22. Further, since a chamfered portion 32c is provided at the end face corner portion of the polygonal columnar portion 32b of the shaft portion 32 on the side of the columnar portion 32a, the valve body 3 moves in the direction of the valve shaft CA and becomes an open state. This makes it easier for the polygonal columnar portion 32b of the shaft portion 32 to fit into the polygonal hole portion 22b of the bearing portion 22.

Although specific embodiments have been described above, the present invention is not limited to their appearance and configuration, and various changes, additions, and deletions can be made without changing the gist of the present invention. Examples include:

1. In the above embodiment, the cross section of the outer diameter portion of the polygonal columnar portion 32b of the shaft portion 32 of the valve body 3 and the cross section of the inner diameter portion of the polygonal hole portion 22b of the bearing portion 22 of the valve case 2 are hexagonal. did. However, the shape is not limited to this, and may be a polygon such as a triangle, quadrangle, pentagon, or heptagon. Considering the balance between preventing rotation of the valve body 3 and ease of fitting the polygonal columnar part 32b into the polygonal hole part 22b, a hexagonal to octagonal shape is suitable.

2. In the above embodiment, the spring 4 is configured as a compression coil spring, but the spring 4 is not limited to this, and a plate spring or a torsion spring may also be adopted.

The embodiments disclosed this time should be considered to be illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and it is intended that all changes within the meaning and scope equivalent to the claims are included.

1 Check valve, 2 Valve case, 3 Valve body, 4 Spring, 10 Main body, 11 Downstream opening, 12 First opening (valve port), 20 Lid, 21 Cylindrical portion, 22 Bearing (bearing) , 22a circular hole section, 22b polygonal hole section, 31 valve section, 32 shaft section, 32a cylindrical section, 32b polygonal column section, 32c chamfered section, CA valve shaft, F water flow, R valve chamber, S outer diameter surface

Claims (3)

A check valve,
A valve case having an upstream valve port and a bearing provided at a position facing the valve port, an umbrella-shaped valve body having a valve portion and a shaft portion, and the shaft portion sliding in the axial direction on the bearing. a spring that biases the valve port in a direction to close the valve portion when movably inserted;
The shaft portion has a cylindrical portion with a circular cross section at the tip side and a polygonal cylindrical portion with a polygonal cross section having an inscribed circle equal to or larger than the outer diameter of the cylindrical portion at the base side,
The bearing is provided with a circular hole portion that supports the cylindrical portion in surface contact on a side far from the valve opening, and a circular hole portion that supports the polygonal cylindrical portion in surface contact on a side closer to the valve opening. A polygonal hole is provided,
In a closed state in which the valve portion closes the valve port, the cylindrical portion fits into the circular hole portion, and in a predetermined range in the axial direction in an open state in which the valve portion opens the valve port. A check valve configured such that the polygonal columnar portion fits into the polygonal hole. In claim 1,
The cross section of the polygonal columnar part of the shaft part is a polygon of hexagon or more. In claim 1 or claim 2,
In the check valve, an end face corner portion of the polygonal columnar portion of the shaft portion on the cylindrical portion side is chamfered.

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