JP6655886B2 - Check valve - Google Patents

Description

The present invention relates to a check valve for allowing a fluid to flow in one direction and preventing a flow in a reverse direction.

2. Description of the Related Art Conventionally, a check valve for preventing a backflow of a fluid flowing in a pipe may be arranged inside a pipe such as a low-pressure cold / hot water circuit or a hot water supply circuit.
As such a check valve, a cylindrical main body having a valve seat, a valve shaft having a flange portion, a valve body abutting on the flange portion, a guide for guiding and sliding the valve shaft, There is known a coil spring that presses a flange portion of the valve shaft in the valve seat direction, wherein the valve shaft is slidably disposed in the main body (for example, see Patent Document 1). ).

JP 2012-255471 A

  The check valve disclosed in Patent Literature 1 has a relatively large number of constituent parts, and requires a lot of man-hours according to the number of parts when assembling them. There was a problem.

Accordingly, an object of the present invention is to provide a check valve for configuring a check valve that is easy to manufacture and can reduce the number of parts by simplifying the structure of a conventional check valve. It is in.

In order to achieve the above object, the check valve of the present invention is configured such that a wall member forming a part of a case forming a valve chamber and a valve member protruding from the wall member are connected by an elastic body. When the valve member is integrally formed and the valve member is separated from the valve seat of the case, the axis of the valve member is tilted with respect to the axis of the valve seat, and the wall member of the check valve is And a case having a corresponding opening and a valve seat formed therein for contacting the valve member, and forming the valve chamber by attaching the check valve body .
In one embodiment of the check valve of the present invention, a connecting member may be further integrally formed between the wall member and the valve member.
Further, in another embodiment of the check valve of the present invention, the valve member, that at least one surface have a substantially conical shape.

At this time , a pressing member that presses the valve member in a direction in which the valve member contacts the valve seat may be further included.
In the case, piping may be connected to both sides of the check valve body in the upstream and downstream directions.

Since the check valve body of the check valve according to the present invention has a structure in which the wall member and the valve member are integrally formed, it is possible to reduce the number of conventional valve shafts and guides, and as a result, the manufacture becomes easy.
Further, since the check valve of the present invention has a simplified structure of the check valve body, the check valve can be formed only by attaching the wall member to the case.
Further, since the number of parts constituting the check valve can be reduced, the total man-hour for assembling the check valve can be reduced.

1 is a longitudinal sectional view of a check valve according to Embodiment 1 of the present invention. 1A is a schematic view of a case to which a check valve body according to a first embodiment of the present invention is attached, FIG. 1A is a front view as viewed from an opening side of the case, and FIG. 1B is a side view thereof. FIG. 3 is a longitudinal sectional view showing a use state of a check valve in which a check valve body according to Embodiment 1 of the present invention is attached to a case, where (a) shows the open state (normal state) of the check valve, and (b) ) Indicates the closed state (reverse flow state) of the check valve. It is a longitudinal cross-sectional view which shows the modification at the time of attaching the check valve body by Example 1 of this invention to a case. It is the schematic which shows the structure of the check valve including the check valve body by Example 2 of this invention, (a) is a perspective view of the check valve body by Example 2, (b) is the check by Example 2 A perspective view of a case to which a check valve body is attached, (c) is a perspective view of a check valve in which the check valve body according to the second embodiment is attached to the case, and (d) is a longitudinal section of the check valve shown in (c). FIG. It is a longitudinal cross-sectional view which shows the use condition which attached the check valve by Example 2 of this invention in the piping.

<Example 1>
First Embodiment A check valve according to a first embodiment of the present invention and a structure of a check valve using the same will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view of a check valve according to Embodiment 1 of the present invention.
FIG. 2 is a schematic diagram of a piping structure to which a check valve body according to the first embodiment of the present invention is attached, and FIG. 2A is a front view as viewed from an opening side of a case, and FIG. b) is a side view thereof.
Further, FIG. 3 is a longitudinal sectional view showing a use state of the check valve in which the check valve body according to the first embodiment of the present invention is attached to a piping structure, and FIG. (Normal state), and FIG. 3 (b) shows a closed state (reverse flow state) of the check valve.

As shown in FIG. 1, the check valve body 10 includes a wall member 11 forming a part of a side surface of a case described later, a valve member 12 protruding from the wall member 11, The connecting member 13 for connecting the valve 11 and the valve member 12 is made of an elastic body integrally formed.
Examples of the elastic body include rubber materials such as silicone rubber, fluorine rubber, and nitrile rubber. Any material having strength, elasticity, or deformability as the check valve body of the present invention can be used. It is also possible to apply a material.

The wall member 11 has a shape that fits into an opening (see reference numeral 25a in FIG. 2A) formed in a case forming a part of a check valve described later. FIG. 1 shows a case where the cross section of the wall member 11 is rectangular.
By fitting the wall member 11 into the opening, the wall member 11 has a function of sealing the fluid flowing in the check valve so as not to flow out of the gap.

The valve member 12 is a disk member having a diameter slightly larger than the inner diameter of the pipe connected to the case, and when receiving pressure from the first surface 12a, the second surface 12b is connected to the inner surface of the case (abutment). 2), the flow of fluid from the first surface 12a side to the second surface 12b side is closed (valve closed).
In this example, as shown in FIG. 1, the first surface 12a is formed as a flat surface without irregularities, and the second surface 12b has a shape protruding in a substantially conical shape.

When a pressure from a fluid is applied to the first surface 12a or the second surface 12b of the valve member 12, the connection member 13 is easily deformed with respect to the wall member 11 so that the valve member 12 is opened. Alternatively, the inner surface of the wall member 11 is connected to the outer periphery of the valve member 12 so that the valve closing operation can be performed.
At this time, by appropriately selecting the width and thickness of the connection member 13, the ease of deformation of the valve member 12 with respect to the wall member 11 can be adjusted, and as a result, the response performance of the check valve body 10 to fluid can be improved. Can be specified.
Note that, depending on the combination of the shapes and materials of the wall member 11 and the valve member 12, the connection member 13 may be omitted and the valve member 12 may be directly connected to the wall member 11.

In the check valve body 10 according to the first embodiment of the present invention, the width of the wall member 11 in the lateral direction of the case is set to be larger than the diameter of the valve member 12.
By adopting such dimensions, when attaching the check valve body 10 to the opening of the case, the valve member 12 can be smoothly inserted into the case without contacting the opening.

The piping structure 20 to which the check valve body 10 according to the first embodiment shown in FIG. 1 is attached constitutes a part of a piping which becomes a flow path of hot water or water such as a water heater, and is shown in FIG. As shown, it is composed of an upstream pipe 21, a downstream pipe 22, and a case 25 connecting these.
The case 25 is a hollow member having an opening 25a in a part of a side surface, and the upper surface 25b and the lower surface 25c each have an area larger than the cross-sectional area due to the outer diameter of the upstream pipe 21 and the downstream pipe 22. . That is, both the upstream pipe 21 and the downstream pipe 22 are connected in the region of the upper surface 25 b or the lower surface 25 c of the case 25.
By adopting such a shape, the valve chamber 26 is formed inside the case 25, and circular opening ends are respectively formed between the upstream pipe 21 and the downstream pipe 22 (see FIG. 2). Not shown).

The case 25 may have any external shape such as a circular shape or a polygonal shape in cross section.
In the case where the outer shape of the case 25 is circular in cross section, an open end connected to the upstream pipe 21 and the downstream pipe 22 is arranged at the center of the case 25, so that the area expanded by the case 25 is symmetric in cross section. Therefore, the pressure field in the flow path can be made uniform.
On the other hand, when the outer shape of the case 25 is polygonal in cross section, the opening 25a for attaching the check valve body 10 shown in FIG. 1 can be formed using one of the plurality of side surfaces. Further, the wall member 11 of the check valve body 10 can be formed in a simple shape having a rectangular cross section.

The check valve body 10 shown in FIG. 1 is attached by fitting the wall member 11 to the opening 25a of the case 25 of the piping structure 20 shown in FIG. 2, and forms a sealed flow path (valve chamber 26). Form.
At this time, the valve member 12 of the check valve body 10 has a substantially conical second surface 12b whose opening end (the valve member 12 and (Contact portion) 21a (see FIG. 3B). That is, the opening end 21a serves as a valve seat with which the valve member 12 contacts.

When attaching the check valve body 10 according to the first embodiment of the present invention to the piping structure 20, the height H1 of the wall member 11 shown in FIG. 1 is smaller than the height H2 of the opening 25a of the case 25 shown in FIG. It is preferable to form them so as to be larger.
With such dimensions, the wall member 11 fits into the opening 25a without a gap, thereby improving the sealing performance against the flow path, and increasing the contact pressure between the wall member 11 and the case 25. The frictional force also provides a retaining effect.

The check valve element 10 according to the first embodiment of the present invention, as shown in FIG. 3A, when the fluid flows from the upstream pipe 21 in the direction of the arrow F1. And moves away from the open end (valve seat) 21a of the upstream pipe 21 under the pressure of the pressure.
Due to such movement of the check valve body 10, the flow path is opened, and the fluid flows from the upstream pipe 21 through the valve chamber 26 in the case 25 to the downstream pipe 22.

On the other hand, as shown in FIG. 3B, when a so-called reverse flow occurs in which the fluid flows from the downstream pipe 22 in the direction of arrow F2, the first surface 12a of the valve member 12 reduces the pressure from the fluid. The second surface 12b of the valve member 12 moves so as to come into contact with the open end (valve seat) 21a of the upstream pipe 21 by receiving the same.
Due to such movement of the check valve body 10, the flow path (valve chamber 26) is closed, and even if the fluid flows in from the downstream pipe 22 side, it is blocked by the valve member 12 and flows into the upstream pipe 21 side. Absent.
In addition, by making the second surface 12b located on the upstream pipe 21 side of the valve member 12 substantially conical, the entire circumference of the circular opening end 21a becomes a side surface (conical shape) of the second surface 12b of the valve member 12. Because of the contact with the surface, the adhesion between the two is improved, and as a result, the valve can be reliably closed without a gap.

According to the check valve body 10 according to the first embodiment of the present invention having the above-described configuration, the valve member 12 is provided in comparison with the conventional structure in which the valve shaft attached with the valve body is opened and closed by inserting the valve shaft through the guide. Since the opening and closing operation can be performed by integrally molding the wall member 11, it is not necessary to separately form the valve shaft, the valve body, and the guide unlike the conventional type, and the number of parts of the check valve is reduced. it can.
In addition, by reducing the number of parts of the check valve, the conventional type requires a plurality of steps such as a step of attaching a valve body to a valve shaft, a step of inserting a valve shaft into a guide, and a step of attaching a guide to a main body. For the assembly work of the check valve, the check valve can be formed only by the step of fitting and attaching the wall member 11 of the integrally formed check valve body 10 to the opening 25 of the piping structure 20. In addition, the number of steps for assembling the check valve can be reduced.

FIG. 4 is a longitudinal sectional view showing a modified example in which the check valve body according to the first embodiment of the present invention is attached to a piping structure.
As shown in FIG. 4, when the check valve body 10 according to the first embodiment is attached to the piping structure 20, the space between the first surface 12 a of the valve member 12 and the opening end 22 a of the case 25 on the downstream piping 22 side is provided. In addition, a pressing member (compression coil spring) 27 that presses the valve member 12 in a direction in which it contacts the open end (valve seat) 21a of the upstream pipe 21 may be arranged.

With such a configuration, the valve member 12 is always in contact with the opening end (valve seat) 21a of the upstream pipe 21 by the pressing member 27 in a no-load state. Even if the first surface 12a of the valve member 12 receives no fluid pressure in a state where the fluid stays inside the case 25, it is possible to prevent the staying fluid from flowing back to the upstream pipe 21 side.
Only when the pressure of the fluid flowing from the upstream pipe 21 is greater than the pressing force of the pressing member 27 pressing the valve member 12 against the opening end (valve seat) 21a, the valve member 12 is opened. (Valve seat) Since the valve is opened from a position away from 21a, the fluid pressure for opening the valve member 12 is adjusted by appropriately selecting the material and shape of the pressing member 27 (ie, the properties of the compression coil spring). It is possible to do.

In the modification shown in FIG. 4, a case where a compression coil spring is arranged as the pressing member 27 is exemplified. However, as long as the valve member 12 has a property capable of pressing the opening end (valve seat) 21a, for example, a leaf spring or the like is used. May be used.
In addition, in the specific examples of FIGS. 2 to 4, the structure in which the upstream pipe 21 and the downstream pipe 22 are connected to the case 25 is illustrated, but these may be separately formed or integrally formed.

<Example 2>
FIG. 5 is a schematic view showing a configuration of a check valve including a check valve according to Embodiment 2 of the present invention. FIG. 5A is a perspective view of the check valve according to Embodiment 2, and FIG. FIG. 5B is a perspective view of a case to which the check valve according to the second embodiment is attached, FIG. 5C is a perspective view of a check valve having the check valve according to the second embodiment attached to the case, and FIG. FIG. 6 is a longitudinal sectional view of the check valve shown in FIG.
As shown in FIG. 5A, the check valve body 110 includes a wall member 111 forming a part of a side surface of a case (see reference numeral 121 in FIG. 5B) described later, and the above-described wall member 111 in the wall member 111. A valve member 112 protruding from the inner surface of the case and a connecting member 113 connecting the wall member 111 and the valve member 112 are formed of an elastic body integrally formed.
Here, the same material as that exemplified in the first embodiment can be applied to the elastic body.

The wall member 111 has a shape that fits into an opening (see reference numeral 125 in FIG. 5B) formed in a case described later. FIG. 5 (a) shows a case where the cross section has an arc shape according to the shape of the case.
The wall member 111 forms a flow path together with the case 121 by being fitted into the opening, and has a function of sealing the fluid flowing in the valve chamber so as not to flow out of the gap.

The valve member 112 is formed as a disc member in the same manner as in the first embodiment, and a second surface 112b is formed on the inner surface of the case when pressure is applied from the first surface 112a. 5 (b) or contact with reference numeral 121c in FIG. 5 (d) to close (close) the flow of fluid from the first surface 112a to the second surface 112b.
At this time, as shown in FIG. 5A, the first surface 112a of the valve member 112 is formed as a flat surface without irregularities, and the second surface 112b has a shape protruding in a substantially conical shape.

The connection member 113 is configured to connect the inner surface of the wall member 111 and the outer periphery of the valve member 112 as in the case of the first embodiment.
Note that the connection member 113 can be omitted and the valve member 112 can be directly connected to the wall member 111 according to the combination of the shapes and materials of the wall member 111 and the valve member 112.

Also in the check valve body 110 according to the second embodiment of the present invention, the width of the wall member 111 in the lateral direction is set to be larger than the diameter of the valve member 112.
By adopting such dimensions, when attaching the check valve body 110 to the opening of the case, the valve member 112 can be smoothly inserted into the case without contacting the opening.

The valve body 120 to which the check valve element 110 according to the second embodiment shown in FIG. 5A is attached includes a cylindrical case 121 as shown in FIG. An opening 125 into which the wall member 111 of the check valve body 110 is fitted is formed in a part of the check valve body 110.
The case 121 includes a downstream opening 121a, an upstream opening (not shown), an annular concave portion 121b formed on an outer surface between the opening 125 and the upstream opening, and an opening. An annular contact portion 121c formed on an inner surface between the upstream opening 125 and the upstream opening.

Then, as shown in FIG. 5C, after the valve member 112 is inserted through the opening 125 of the case 121, the check valve body 110 is fitted by fitting the wall member 111 into the opening 125. A valve chamber 126 as shown in FIG.
At this time, similarly to the case of the first embodiment, the height H1 of the wall member 111 shown in FIG. 5A is slightly larger than the height H2 of the opening 125 of the case 121 shown in FIG. It is preferable to form it.
With such dimensions, the wall member 111 fits into the opening 125 without a gap, thereby improving the sealing performance with respect to the flow path (valve chamber 126), and the contact between the wall member 111 and the opening 125. Since the pressure is increased, a frictional force also provides a retaining effect.

As shown in FIGS. 5B and 5D, the inner diameter of the downstream side (upper side in the drawing) of the case 121 is set to be larger than the diameter of the valve member 112 of the check valve body 110. The inner diameter of the contact portion 121c is set to be smaller than the diameter of the valve member 112 of the check valve body 110.
The valve member 112 of the check valve body 110 has a substantially conical second surface 112 b formed in a state where no fluid flows in the valve chamber 126 of the case 121. It is arranged at a position where it contacts with 121c. That is, the annular contact portion 121c serves as a valve seat with which the valve member 112 contacts.
In addition, in the check valve 100 according to the second embodiment, as shown in FIG. 4 of the first embodiment, the pressing that presses the valve member 112 in the direction in which the valve member 112 contacts the annular contact portion (valve seat) 121 c of the case 121. A member (compression coil spring) may be arranged between the first surface 112a of the valve member 112 and the downstream opening 121a of the case 121.

In addition, a step portion 125a is formed in the opening 125 of the case 121 in the thickness direction thereof.
The step 125a contacts a part of the inner surface of the wall member 111 as shown in FIG. For this reason, the wall member 111 of the check valve body 110 fits closely with the opening 125 of the case 121 not only on the side surface but also on the inner surface side, and the sealing performance of the valve chamber 126 can be improved.

The check valve 100 according to the second embodiment of the present invention can be applied as an alternative to the check valve used in the conventional piping.
FIG. 6 is a longitudinal sectional view illustrating a use state in which the check valve 100 according to the second embodiment of the present invention is mounted in a pipe.

As shown in FIG. 6, the check valve 100 according to the second embodiment is mounted on the inner surface side of the downstream pipe 22 connected to the upstream pipe 21.
More specifically, the check valve 100 according to the second embodiment is formed such that the outer diameter thereof (that is, the outer diameter of the case 121) is substantially equal to the inner diameter of the end 22b of the downstream pipe 22. Is inserted from the end of the case 121 to a position where the end 121d of the case 121 and the step 22c formed on the inner surface of the downstream pipe 22 come into contact with each other.
At this time, an annular elastic member 34 such as an O-ring is attached to the annular concave portion 121b formed on the outer peripheral surface of the case 121, thereby fixing the case 121 and ensuring watertightness.

The upstream pipe 21 is attached to the end 22b of the downstream pipe 22 after the check valve 100 is attached. At this time, an annular projection 21c whose outer diameter is substantially equal to the inner diameter of the end 22b of the downstream pipe 22 is formed at the end 21b of the upstream pipe 21, and the projection 21c is connected to the downstream pipe 22. Is interpolated.
The end 21b of the upstream pipe 21 and the end 22b of the downstream pipe 22 each have a flange shape protruding outward, and after being abutted against each other, are fastened and fixed by an annular fastener 30.

An annular concave portion is formed on the outer peripheral surface of the protruding portion 21c of the upstream pipe 21, and an annular elastic member 32 such as an O-ring is attached to the annular concave portion.
The connection between the upstream pipe 21 and the downstream pipe 22 is hermetically sealed from the outside by the annular elastic member 32.

In the check valve 100 according to the second embodiment, which is incorporated in the connection portion of the pipes in the arrangement shown in FIG. 6, the fluid flows from the upstream pipe 21 side. Then, the case 121 moves away from the annular contact portion (valve seat) 121c of the case 121.
By the movement of the check valve body 110, the flow path is opened, and the fluid flows to the downstream pipe 22 through the downstream opening 121a of the case 121.

On the other hand, when a so-called reverse flow occurs in which fluid flows from the downstream pipe 22 side, the first surface 112a of the valve member 112 receives pressure from the fluid, and the second surface 112b of the valve member 112 It moves so that it may contact the annular contact part (valve seat) 121c of 121.
Due to such movement of the check valve body 110, the flow path is closed, and even if the fluid flows into the check valve 100 from the downstream pipe 22 side, it is blocked by the valve member 112 and flows to the upstream pipe 21 side. Absent.
In addition, by making the second surface 112b of the valve member 112 substantially conical, the entire circumference of the annular contact portion (valve seat) 121c is in contact with the side surface (conical surface) of the second surface 112b of the valve member 112. Since they are in contact with each other, the adhesion between them is improved, and as a result, the valve can be reliably closed without a gap.

According to the check valve body 110 according to the second embodiment of the present invention having the above-described configuration, the valve member 112 is integrally formed with the wall member 111, and the wall member 111 is formed as a part of the cylindrical case 121. Since the cross-section is formed in a circular arc shape, the number of parts of the check valve can be reduced, and it can be easily applied as a conventional alternative disposed inside the pipe.
Further, by reducing the number of parts of the check valve and making the case 121 cylindrical, the number of steps for assembling the check valve itself can be reduced, and the work of mounting the check valve in the piping can be simplified. .

The present invention is not limited to the above embodiments, and various modifications can be made.
For example, in the first and second embodiments, the case where the height of the wall member of the check valve body is set to be slightly larger than the height of the opening of the case has been described. Dimensions such as making it slightly larger, or making both the height and width of the wall member slightly larger may be adopted.
In particular, when both the height and the width of the wall member are increased, the gap can be made substantially zero when the wall member is fitted with the opening, so that the structure of the check valve of the present invention is more improved. It is possible to apply the present invention to a flow path requiring high airtightness or watertightness.

In the first and second embodiments, when a compression coil spring is disposed as the pressing member, annular concave portions that receive both ends of the compression coil spring are provided on both the valve body of the check valve body and the opening end of the case. It may be formed (see FIG. 4).
According to such a modification, when assembling the check valve by combining the check valve body and the piping structure, the positioning of the valve member, the spring, and the opening end of the case can be omitted, thereby simplifying the assembling work. it can.

10, 110 Check valve body 11, 111 Wall member 12, 112 Valve member 13, 113 Connection member 20 Piping structure 120 Valve body 21 Upstream piping 21a Open end (valve seat)
121c Contact part (valve seat)
22 Downstream piping 25, 121 Case 25a, 125 Opening 26, 126 Valve chamber 27 Pressing member 30 Annular fastener 32, 34 Annular elastic member

Claims (5)

A wall member forming a part of a case forming a valve chamber and a valve member protruding from the wall member are connected by an elastic body to be integrally formed, and the valve member is separated from a valve seat of the case. Sometimes, the axis of the valve member has a check valve body inclined with respect to the axis of the valve seat, and an opening corresponding to the wall member of the check valve body, and contacts the valve member inside. the valve seat is formed, a check valve which comprises a, a case of forming the valve chamber by attaching the check valve body. The check valve according to claim 1, wherein a connecting member is further integrally formed between the wall member and the valve member. The check valve according to claim 1, wherein at least one surface of the valve member has a substantially conical shape. The check valve according to any one of claims 1 to 3, further comprising a pressing member that presses the valve member in a direction in which the valve member contacts the valve seat. The check valve according to any one of claims 1 to 4, wherein the case has piping connected to both sides of the check valve body in the upstream and downstream directions.

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