JP2016217504A - Check valve element and check valve using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve element for forming a check valve which is easily manufactured and reduces the number of components, and to provide the check valve using the check valve element.SOLUTION: In a check valve element 10, a wall member 11, which forms a part of a case forming a valve chamber 26, and a valve member 12, which is provided protruding from the wall member 11, are integrally molded by an elastic body.SELECTED DRAWING: Figure 3

Description

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

Conventionally, a check valve for preventing a backflow of a fluid flowing in the pipe may be disposed inside the 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 provided with a flange portion, a valve body in contact with the flange portion, a guide for guiding and sliding the valve shaft, A coil spring that presses the flange portion of the valve shaft in the valve seat direction is known, and the valve shaft is slidably disposed in the main body (see, for example, Patent Document 1). ).

JP 2012-255471 A

  The check valve disclosed in Patent Document 1 has a relatively large number of components, and it takes a lot of time and money for assembly work because it takes man-hours according to the number of components when assembling them. There was a problem.

  Accordingly, an object of the present invention is to simplify a structure of a conventional check valve, and to manufacture a check valve body for constituting a check valve that can be easily manufactured and can reduce the number of parts. It is to provide a check valve used.

In order to achieve the above object, a check valve body according to the present invention includes a wall member forming a part of a case forming a valve chamber and a valve member protruding from the wall member, which are integrally formed by an elastic body. It is characterized by that.
In one embodiment of the check valve body of the present invention, a connection member may be further integrally formed between the wall member and the valve member.
In another embodiment of the check valve body of the present invention, at least one surface of the valve member has a substantially conical shape.
Furthermore, the width of the case in the cross-sectional direction of the wall member may be formed to be larger than the diameter of the valve member.

The check valve body according to the present invention has an opening corresponding to the wall member of the check valve body, a valve seat that contacts the valve member is formed therein, and the check valve body is attached to the check valve body. Thus, a check valve can be formed in combination with the case forming the valve chamber.
At this time, you may further include the press member which presses the said valve member in the direction contact | abutted to the said valve seat.
The case may have pipes connected to both sides of the check valve body in the upstream and downstream directions.

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

It is a longitudinal cross-sectional view of the check valve body by Example 1 of this invention. It is the schematic of the case where the non-return valve body by Example 1 of this invention is attached, (a) is the front view seen from the opening part side of the case, (b) is the side view. It is a longitudinal cross-sectional view which shows the use condition of the non-return valve which attached the non-return valve body by Example 1 of this invention to the case, (a) shows the valve opening state (normal state) of a non-return valve, (b ) Indicates the closed state (backflow state) of the check valve. It is a longitudinal cross-sectional view which shows the modification at the time of attaching the non-return valve body by Example 1 of this invention to a case. It is the schematic which shows the structure of the non-return valve containing the non-return valve body by Example 2 of this invention, (a) is a perspective view of the non-return valve body by Example 2, (b) is the reverse by Example 2. The perspective view of the case where a check valve body is attached, (c) is the perspective view of the check valve which attached the check valve body by Example 2 to the case, (d) is the longitudinal cross-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 piping.

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

As shown in FIG. 1, the check valve body 10 includes a wall member 11 that forms a part of a side surface of a case that will be described later, a valve member 12 that is positioned so as to project from the wall member 11, and the wall member. 11 and the connecting member 13 that connects the valve member 12 are made of an integrally formed elastic body.
Examples of the elastic body include rubber materials such as silicone rubber, fluorine rubber, and nitrile rubber. However, any elastic material may be used as long as the check valve body has strength, elasticity, or deformability. It is also possible to apply materials.

The wall member 11 has a shape that fits into an opening (see reference numeral 25a in FIG. 2A) formed in a case that forms a part of a check valve described later. In FIG. 1, the case where the cross section of the wall member 11 is a rectangle is shown.
The wall member 11 exhibits a function of sealing so that the fluid flowing in the check valve does not flow out of the gap by fitting into the opening.

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 the pressure is received from the first surface 12a, the second surface 12b is in contact with the inner surface of the case (abutment). Part) is closed (closed) from the fluid flow from the first surface 12a side to the second surface 12b side.
In this example, as shown in FIG. 1, the 1st surface 12a is formed in a flat surface without an unevenness | corrugation, and the 2nd surface 12b has a shape which protrudes in a substantially cone shape.

When the pressure from the fluid is applied to the first surface 12a or the second surface 12b of the valve member 12, the connecting member 13 is easily deformed with respect to the wall member 11 to open the valve. Or it is comprised so that the inner surface of the wall member 11 and the outer periphery of the valve member 12 may be connected so that valve closing operation | movement can be performed.
At this time, it is possible to adjust the ease of deformation of the valve member 12 with respect to the wall member 11 by appropriately selecting the width and thickness of the connecting member 13, and as a result, the response performance of the check valve body 10 to the fluid is improved. Can be prescribed.
In addition, according to the combination of the shape and material of the wall member 11 and the valve member 12, the said connection member 13 can be abbreviate | omitted and the valve member 12 can also be connected with the wall member 11 directly.

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 the check valve body 10 is attached to the opening of the case, the valve member 12 can be smoothly inserted into the case without contacting the opening.

A pipe 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 pipe serving as a flow path through which hot water or water flows, such as a water heater. As shown, it consists of an upstream pipe 21, a downstream pipe 22, and a case 25 connecting them.
The case 25 is a hollow member having an opening 25a in a part of the side surface, and the upper surface 25b and the lower surface 25c both have an area larger than the cross-sectional area due to the outer diameters of the upstream pipe 21 and the downstream pipe 22. . That is, the upstream pipe 21 and the downstream pipe 22 are both connected within the region of the upper surface 25b or the lower surface 25c of the case 25.
By adopting such a shape, a valve chamber 26 is formed inside the case 25, and a circular opening end is formed between the upstream pipe 21 and the downstream pipe 22 (FIG. 2 is a diagram). Not shown).

The case 25 may have any outer shape such as a circle or a polygon in cross section.
When the outer shape of the case 25 is circular in cross section, an opening end connected to the upstream pipe 21 and the downstream pipe 22 is arranged at the center thereof, so that the region expanded in diameter by the case 25 is symmetrical 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 a plurality of side surfaces. Furthermore, the wall member 11 of the check valve body 10 can be formed in a simple shape having a square cross section.

The check valve body 10 shown in FIG. 1 is attached by fitting its wall member 11 to the opening 25a of the case 25 of the piping structure 20 shown in FIG. 2, and a sealed flow path (valve chamber 26) is provided. Form.
At this time, the valve member 12 of the check valve body 10 has a second surface 12b formed in a substantially conical shape in a state where no fluid flows in the flow path, and the open end of the upstream pipe 21 (with the valve member 12). Is disposed at a position in contact with 21a (see FIG. 3B). That is, the open end 21a serves as a valve seat with which the valve member 12 abuts.

When the check valve body 10 according to the first embodiment of the present invention is attached to the piping structure 20, the height H1 of the wall member 11 shown in FIG. 1 is slightly smaller than the height H2 of the opening 25a of the case 25 shown in FIG. It is preferable to form so as to be larger.
By adopting such dimensions, the wall member 11 is fitted into the opening 25a without any gap, and the sealing performance with respect to the flow path is improved, and the contact pressure between the wall member 11 and the case 25 is increased. A retaining effect is also obtained by the frictional force.

In the check valve body 10 according to the first embodiment of the present invention, as shown in FIG. 3A, in the so-called normal state in which fluid flows from the upstream pipe 21 side in the direction of arrow F1, the valve member 12 is fluid. In response to the pressure from the upstream pipe 21, it moves away from the open end (valve seat) 21a of the upstream pipe 21.
By such a movement of the check valve body 10, the flow path is opened, and the fluid flows from the upstream pipe 21 side through the valve chamber 26 in the case 25 to the downstream pipe 22 side.

On the other hand, as shown in FIG. 3 (b), when a so-called reverse flow occurs in which the fluid flows from the downstream pipe 22 in the direction of the arrow F2, the first surface 12a of the valve member 12 reduces the pressure from the fluid. By receiving, the 2nd surface 12b of the valve member 12 moves so that the opening edge part (valve seat) 21a of the upstream piping 21 may contact.
By such a movement of the check valve body 10, the flow path (valve chamber 26) is closed, and even if the fluid flows from the downstream pipe 22 side, it is blocked by the valve member 12 and flows to the upstream pipe 21 side. Absent.
Further, by setting the second surface 12b located on the upstream pipe 21 side of the valve member 12 to be substantially conical, the entire circumference of the circular opening end portion 21a is the side surface (conical shape) of the second surface 12b of the valve member 12. The contact between the two surfaces 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 with respect to a conventional structure that opens and closes by inserting a valve shaft to which the valve body is attached into a guide. Since the structure can be opened and closed by integrally forming the wall member 11, there is no need to separately form the valve shaft, the valve body and the guide as in the conventional type, and the number of check valve parts is reduced. it can.
In addition, by reducing the number of check valve parts, a conventional type that requires a plurality of steps such as a step of attaching a valve body to a valve shaft, a step of inserting the valve shaft into a guide, and a step of attaching the guide to the main body is required. For the check valve assembly operation, the check valve can be formed only by fitting the wall member 11 of the integrally formed check valve body 10 to the opening 25 of the piping structure 20 and attaching it. The number of check valve assembly operations 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 the piping structure.
As shown in FIG. 4, when the check valve body 10 according to the first embodiment is attached to the pipe structure 20, the gap between the first surface 12 a of the valve member 12 and the open end 22 a on the downstream pipe 22 side of the case 25. In addition, a pressing member (compression coil spring) 27 that presses the valve member 12 in a direction in which the valve member 12 comes into contact with the opening end (valve seat) 21a of the upstream pipe 21 may be disposed.

If such a configuration is adopted, 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. However, even if the first surface 12a of the valve member 12 is not subjected to fluid pressure in a state where it stays inside the case 25, the staying fluid can be prevented from flowing back to the upstream pipe 21 side.
In addition, the valve member 12 opens only when the fluid pressure of the fluid to be introduced from the upstream pipe 21 is larger than the pressing force by which the pressing member 27 presses the valve member 12 against the opening end (valve seat) 21a. (Valve Seat) Since the valve is opened 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 nature of the compression coil spring). It becomes possible to do.

In the modification shown in FIG. 4, the case where a compression coil spring is disposed as the pressing member 27 is illustrated. However, if the valve member 12 has a property capable of pressing the opening end (valve seat) 21a, for example, a leaf spring or the like. Alternate structures may be used.
Moreover, in the specific example of FIGS. 2-4, although the structure which connects the upstream piping 21 and the downstream piping 22 to the case 25 was illustrated, these may be comprised separately or may be formed integrally.

<Example 2>
FIG. 5 is a schematic view showing a configuration of a check valve including a check valve body according to Embodiment 2 of the present invention. FIG. 5A is a perspective view of the check valve body according to Embodiment 2, and FIG. FIG. 5B is a perspective view of a case to which the check valve body according to the second embodiment is attached, FIG. 5C is a perspective view of the check valve with the check valve body 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 that forms 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. The valve member 112 positioned so as to protrude from the inner surface side of the case, and the connection member 113 connecting the wall member 111 and the valve member 112 are made of an integrally molded elastic body.
Here, a material similar to that exemplified in Example 1 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. 5A shows a case where the cross section has an arc shape in accordance with the shape of the case.
The wall member 111 forms a flow path together with the case 121 by fitting into the opening, and exhibits a function of sealing so that the fluid flowing through the valve chamber does not flow out of the gap.

The valve member 112 is formed as a disk member in the same manner as in the first embodiment, and when the pressure is received from the first surface 112a, the second surface 112b is formed on the inner surface of the case (see FIG. 5 (b) or FIG. 5 (d) reference 121c), the flow of fluid from the first surface 112a side to the second surface 112b side is closed (valve closed).
At this time, as shown to Fig.5 (a), the 1st surface 112a of the valve member 112 is formed in the plane without an unevenness | corrugation, and the 2nd surface 112b has a shape which protrudes in a substantially cone shape.

As in the case of the first embodiment, 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.
In addition, according to the combination of the shape and material of the wall member 111 and the valve member 112, the connection member 113 may be omitted and the valve member 112 may be directly connected to the wall member 111.

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 the check valve body 110 is attached to the opening of the case, the valve member 112 can be smoothly inserted into the case without contacting the opening.

A valve main body 120 to which the check valve body 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 recess 121b formed on the outer surface between the opening 125 and the upstream opening, and an opening. 125 and an annular contact portion 121c formed on the inner surface between the upstream opening and 125.

Then, as shown in FIG. 5C, after inserting the valve member 112 from the opening 125 of the case 121, the wall member 111 is fitted into the opening 125 so that the check valve body 110 is placed in the case. It attaches to 121 and forms the valve chamber 126 as shown in FIG.5 (d).
At this time, as in 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. 5B. It is preferable to form as follows.
By adopting such dimensions, the wall member 111 is fitted into the opening 125 without a gap, and the sealing performance with respect to the flow path (valve chamber 126) is improved, and the contact between the wall member 111 and the opening 125 is improved. Since the pressure increases, a retaining effect is also obtained by the frictional force.

As shown in FIGS. 5 (b) and 5 (d), the inner diameter on the downstream side (upper side in the drawing) of the case 121 is set 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 is configured such that the second surface 112b formed in a substantially conical shape is an annular contact portion of the case 121 in a state where no fluid flows in the valve chamber 126 of the case 121. It arrange | positions in the position contact | abutted to 121c. That is, the annular contact portion 121c serves as a valve seat with which the valve member 112 contacts.
In the check valve 100 according to the second embodiment as well, as shown in FIG. 4 of the first embodiment, the valve member 112 is pressed in a direction in which the valve member 112 is in contact with the annular contact portion (valve seat) 121c of the case 121. A member (compression coil spring) may be disposed between the first surface 112 a of the valve member 112 and the downstream opening 121 a of the case 121.

In addition, a step 125 a is formed in the opening 125 of the case 121 in the thickness direction.
As shown in FIG. 5D, the stepped portion 125a contacts a part of the inner surface of the wall member 111. For this reason, the wall member 111 of the check valve body 110 is closely fitted to the opening 125 of the case 121 not only on the side surface side but also on the inner surface side, so that 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 also be applied as an alternative to the check valve used in the conventional piping.
FIG. 6 is a longitudinal sectional view showing a use state in which the check valve 100 according to the second embodiment of the present invention is installed in the pipe.

As shown in FIG. 6, the check valve 100 according to the second embodiment is attached to the inner surface side of the downstream pipe 22 connected to the upstream pipe 21.
Specifically, the check valve 100 according to the second embodiment is formed so that the outer diameter thereof (that is, the outer diameter of the case 121) is substantially equal to the inner diameter of the end portion 22b of the downstream pipe 22. The end portion 121d of the case 121 and the stepped portion 22c formed on the inner surface of the downstream pipe 22 are inserted from the end portion side to the position where they contact each other.
At this time, an annular elastic member 34 such as an O-ring, for example, is attached to the annular recess 121b formed on the outer peripheral surface of the case 121 to fix the case 121 and ensure water tightness.

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

Further, an annular recess is formed on the outer peripheral surface of the projecting portion 21c of the upstream pipe 21, and an annular elastic member 32 such as an O-ring is attached to the annular recess.
The annular elastic member 32 hermetically seals the connection between the upstream pipe 21 and the downstream pipe 22 with respect to the outside.

In the check valve 100 according to the second embodiment, which is installed in the connection portion of the pipe in the arrangement as shown in FIG. 6, the fluid flows from the upstream pipe 21 side, and in the so-called normal state, the valve member 112 is pressure from the fluid. In response, it moves away from the annular contact portion (valve seat) 121c of the case 121.
By such a movement of the check valve body 110, the flow path is opened, and the fluid flows through the downstream opening 121a of the case 121 to the downstream pipe 22 side.

On the other hand, when a so-called reverse flow occurs where the fluid flows from the downstream pipe 22 side, the first surface 112a of the valve member 112 receives pressure from the fluid, so that the second surface 112b of the valve member 112 becomes the case. It moves so as to come into contact with an annular contact portion (valve seat) 121c of 121.
By such a 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.
Further, by setting the second surface 112b of the valve member 112 to be substantially conical, the entire circumference of the annular contact portion (valve seat) 121c is the side surface (conical surface) of the second surface 112b of the valve member 112. Since they come into 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 the application can be easily performed as an alternative to the conventional type disposed inside the pipe.
Further, by reducing the number of parts of the check valve and making the case 121 cylindrical, it is possible to reduce the man-hours for assembling the check valve itself and simplify the work of mounting the check valve in the pipe. .

The present invention is not limited to the above embodiments, and various modifications can be made.
For example, in the first embodiment and the second embodiment, the case where the height of the wall member of the check valve body is slightly larger than the height of the opening of the case is illustrated, but the width is not the height of the wall member. You may employ | adopt the dimension of making it slightly enlarged or making both the height and width of a wall member slightly increased.
In particular, when both the height and width of the wall member are increased, the gap can be made substantially zero when the wall member is fitted to the opening. It becomes possible to apply to a flow path which requires high airtightness or watertightness.

Moreover, in Example 1 and Example 2, when arrange | positioning a compression coil spring as a press member, the cyclic | annular recessed part which receives the both ends of the said compression coil spring in both the valve main body of a non-return valve body, and the opening edge part of a case. You may form (refer FIG. 4).
According to such a modification, when assembling the check valve by combining the check valve body and the piping structure, positioning of the valve member, the spring, and the opening end portion of the case can be omitted, so that the assembly work is simplified. 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 Press member 30 Annular fasteners 32, 34 Annular elastic member

Claims (7)

  A check valve body, wherein a wall member forming a part of a case forming a valve chamber and a valve member projecting from the wall member are integrally formed of an elastic body.   The check valve body according to claim 1, wherein a connecting member is further integrally formed between the wall member and the valve member.   The check valve body according to claim 1 or 2, wherein at least one surface of the valve member has a substantially conical shape.   The check valve body according to any one of claims 1 to 3, wherein a width of the case in the lateral direction of the wall member is formed to be larger than a diameter of the valve member. .   A check valve body according to any one of claims 1 to 4, and an opening corresponding to the wall member of the check valve body, and a valve seat that contacts the valve member is formed therein. And a case which forms the valve chamber by attaching the check valve body.   The check valve according to claim 5, further comprising a pressing member that presses the valve member in a direction in contact with the valve seat.   The check valve according to any one of claims 1 to 6, wherein pipes are connected to both sides of the check valve body in an upstream and downstream direction of the case.

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