JPH0543327Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a check valve used in piping such as cold and hot water, air, gas, etc. In particular, the present invention relates to a check valve that is used in piping such as cold and hot water, air, gas, etc. The present invention relates to an improvement in a check valve having a valve body and a cap-shaped valve member of an elastic material.

(Prior Art) Conventionally, this type of valve has been constructed as shown in FIG. In the figure, 101 is a tapered basket-shaped valve body having a large number of openings 102, and 103 is a cap-shaped valve member made of an elastic material such as rubber. It is fixed to the tip of the valve body 101 by a bolt 104 embedded in the valve body 101.

In FIG. 6, the left side is the inflow side, and the fluid flowing from the left side to the right pushes the valve member 103 through the opening 102 of the valve body 101, and pushes the valve member 103.
3 is deformed to create a gap between the valve body 101 and the valve member 103, and the water flows to the right outflow side through this gap. Note that in order to easily deform the valve member 103 to reduce fluid resistance and reduce pressure drop, ridges and grooves are provided on the inner wall surface of the valve member 103 to vary the thickness of the valve member 103. 103
Efforts have been made to deform it so that it can be folded. However, this makes the valve member 103 more likely to be damaged and shortens its service life.

Next, when the pressure of the fluid on the inflow side becomes lower than the pressure of the fluid on the outflow side, the valve member 103 returns to the state shown in FIG.
02 to prevent the fluid from flowing backwards from the right to the left. In order to quickly return the valve member 103 to its original state, measures such as providing an annular protrusion 105 on the outer edge of the valve member 103 are taken.

However, in the conventional valve of this type shown in FIG. Because of this, the valve member 103 has a high rigidity, and in order to deform the valve member 103, which has a high rigidity, there is a disadvantage that fluid resistance is large and pressure loss is large.

Further, if the valve member 103 is easily deformed to a large extent, it is difficult for the valve member 103 to return to the original shape shown in FIG. It is not possible to prevent the occurrence of backflow immediately, and a water hammer phenomenon occurs because the backflow is suddenly stopped after the backflow has occurred, and furthermore, this has the disadvantage that the valve member 103 is easily damaged and its service life is shortened. have.

In order to improve the drawbacks of conventional valves of this type, the Utility Model Publication Act of 1983-
This is a device described in Publication No. 20360, and FIG. 7 shows its structure. In the same figure, 11
1 is a tapered basket-shaped valve body having a large number of openings 112; 113 is a cap-shaped valve member made of an elastic material such as rubber;
is provided so that a bolt 114 embedded in its tip can move a predetermined distance in the fluid flow direction through a hole 116 provided in the tip of the valve body 111. Reference numeral 115 denotes an annular protrusion provided on the outer edge of the valve member 113.

In the check valve shown in FIG. 7, fluid flowing from the left side to the right side on the inflow side pushes the valve member 113 through the opening 112 of the valve body 111, causing the valve member 113 to move to the right. A gap is created between the valve body 111 and the valve member 113, and through this gap, fluid flows from the left side, which is the inflow side, to the right side, which is the outflow side. Next, when the pressure of the fluid on the inflow side becomes lower than the pressure of the fluid on the outflow side, a backflow occurs in which the fluid flows from the right to the left in FIG. 7, but this backflow pushes the valve member 113 to the left. The valve member 113 returns to the state shown in FIG.
2 to prevent backflow of fluid from the right side, which is the outflow side, to the left side, which is the inflow side. For this reason,
The check valve of this structure has the advantage of lower fluid resistance and less pressure loss than the conventional check valve of this type described above with reference to FIG.

However, in the check valve shown in FIG. 7, the valve member 113 cannot be moved to the left, which is the inflow side, to prevent backflow until after backflow has occurred. Moreover, when the valve member 11 is moving to the right,
3 is not necessarily located concentrically with the flow path due to its own weight and the influence of fluid flow, so bolt 114
The valve member 103 cannot be moved to the left unless a twist occurs between the valve body 111 and the hole 116 at the tip of the valve body 111, and a certain amount of backflow occurs.
For this reason, it has the disadvantage that it is not possible to prevent backflow before it occurs or immediately after it occurs. Furthermore, after a certain amount of backflow has occurred, a severe water hammer phenomenon occurs in order to prevent this backflow, and this water hammer phenomenon tends to damage the valve member 113, which has the drawback of shortening its service life. ing.

(Problems to be Solved by the Invention) The present invention solves the following problems in a check valve having a tapered basket-shaped valve body having a plurality of openings and a cap-shaped valve member made of an elastic material, as described above. This is an attempt to solve such problems.

(1) Large fluid resistance and pressure drop.

(2) Water hammer phenomenon occurs.

(3) Short service life.

(Means for solving the problems) In order to solve the above problems, the present invention
It was configured as follows.

In other words, a tapered basket-shaped valve body having multiple openings on an inclined surface and fixed to the flow channel with its tip facing toward the inflow side of the flow channel, and a cap-shaped valve member made of an elastic material attached to the inside of the valve body. In the check valve, an opening is formed at the top of the distal end of the valve body, and a guide member having a plurality of fluid ports is provided in the flow path at a position on the outflow side of the flow path of the valve body. A support shaft is slidably mounted in the direction of the flow path in the center of this guide member, and the tip of this support shaft is fixed to the inside of the tip of the valve member, and guided midway on this support shaft. A flange is formed to engage a part of the member, and the valve member is pressed against the valve body by the elastic force of a spring member installed between the guide member and the valve member.

(Function) Since the present invention is constructed as described above, the fluid flows from the inflow side through the plurality of openings in the tapered basket-shaped valve body with the tip facing toward the inflow side of the flow path. A cap-shaped valve member made of elastic material is pressed inside the valve body. Therefore, the valve member compresses the spring member installed between the guide member and the valve member, and the support shaft to which the valve member is fixed moves toward the outflow side while sliding the guide member in the direction of the flow path. do. Therefore, a gap is created between the valve body and the valve member, and the fluid flows toward the outflow side.

Then, until the pressure on the inlet side becomes almost the same as the pressure on the outlet side and the fluid flow almost stops,
The valve member moves toward the inflow side by the elastic force of the spring member and closes the opening of the valve body. Therefore, no backflow occurs from the outflow side to the inflow side. Therefore, no water hammer phenomenon occurs.

Of course, the valve member travels a sufficient distance to create sufficient clearance so that there is less fluid resistance and less pressure drop. Furthermore, since the valve member is less deformed and no water hammer phenomenon occurs, the valve member is not damaged and has a long service life.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a vertical sectional view showing one embodiment of the check valve of the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment of the same as above, and Fig. 3 is an exploded view of the check valve of Fig. 2. FIG. 4 is a partially cutaway perspective view showing the operating state of the check valve of FIG. 2. FIG.

In FIGS. 1 to 4, reference numeral 1 denotes a tapered basket-shaped valve body formed into a conical or ellipsoidal conical shape, and the valve body 1 has a large number of openings 1a with its tip facing toward the inflow side. ing. Note that in each of FIGS. 1 to 4, the inflow side is drawn on the left and the outflow side is drawn on the right.

Reference numeral 2 denotes a cap-shaped valve member made of an elastic material, and the valve member 2 is mounted inside the valve body 1. 3 is a support shaft, 4 is a spring member, and 5 is a guide member, the tip end 3a of the support shaft 3 is connected to the tip end 2 of the valve member 2.
The other end 3b of the support shaft 3 is fitted into the guide hole 5a of the guide member 5 so as to be slidable in the direction of the flow path. Further, the spring member 4 is connected to the bottom portion 2b of the valve member 2 and the spring receiving portion 5 of the guide member 5.
It is installed between b. Furthermore, 3c is a flange of the support shaft 3 that comes into contact with the guide member 5 in order to limit the distance of movement of the valve member when it moves to the right.

Reference numeral 6 denotes a housing that fixes the guide member 5 to the valve body 1 on the outflow side of the valve body 1, and the housing 1 is a valve box in the embodiment shown in FIG. In the embodiment shown in FIGS. 4 to 4, the housing 6 is a gasket made of an annular elastic material and has a U-shaped cross section as shown in the figure.
The pipe is attached between a pair of flange joints on the pipe. In the embodiment shown in FIG. 1, the guide member 5 is formed in a part of the valve box.

Furthermore, 1b is an opening 1a of the valve body 1 provided at the tip of the valve body 1, 5c is a fluid passage provided in the guide member 5, and 1c is an opening 1a of the valve body 1 provided in the casing. (Valve box or gasket made of elastic material) 6
This is a flange for holding it in place.

Next, the operation of the embodiment shown in FIGS. 1 to 4 will be explained.

The flow of fluid from the inflow side, that is, the left side in the drawing, pushes the valve member 2 through the openings 1a and 1b of the valve body 1 toward the outflow side, that is, to the right side in the drawing. Therefore, the valve member 2 moves to the state shown in FIG. 4, with the support shaft 3 being guided in the direction of the flow path by the guide member 5 while compressing the spring member 4. Therefore, a gap is created between the valve body 1 and the valve member 2, and fluid flows from the inflow side through the openings 1a and 1b, and further passes through the gap and the fluid passage 5c to the outflow side.

Next, the valve member 2 is moved toward the inflow side by the elastic force of the spring member 4 until the pressure P ₁ on the inflow side becomes almost the same as the pressure P ₂ on the outflow side and the flow of fluid almost stops. The openings 1a and 1b of the valve body 1 are closed. Therefore, no backflow occurs from the outflow side to the inflow side. Therefore, no water hammer phenomenon occurs.

In this way, the check valve of the present invention can create a sufficiently wide gap between the valve body 1 and the valve member 2, and the opening 1a has a sufficiently wide total area including the opening 1b at the tip. Since an opening can be formed in the pipe, the fluid resistance is small and the pressure drop is small. Furthermore,
Since the valve member 2 does not undergo large deformation and water hammer does not occur, it is not damaged and has a long service life.

5A, 5B, and 5C are half-cut sectional views for explaining an example of an embodiment of the present invention, and the reference numerals in these drawings are the same as those in FIGS. 1 to 4. Similarly, the symbols not shown in FIGS. 1 to 4 are as shown in the following text.

In this embodiment, a part of the tapered intermediate body of the tapered basket-shaped valve body 1 formed in a conical shape is bulged outward, and this part is 1d in the drawing.
It is shown with the symbol. On the other hand, the portion of the cap-shaped valve member facing 1d is not inflated.

In Fig. 5A, the fluid on the inflow side is
The state in which the valve member 2 moves toward the outflow side while compressing the spring member 4 after the inflow from b is shown. At this time, the fluid flows as shown by the arrow in the figure.

FIG. 5B shows a state in which the pressure on the inflow side is almost the same as the pressure on the outflow side, and the valve member 2 is moved toward the inflow side by the elastic force of the spring member 4 and is pressed against the valve body 1. It shows. In this state, backflow as shown by the arrow does not occur.

Furthermore, as shown in FIG. It shows a state in which it is deformed so as to come into contact with the portion 1d. By deforming the valve member 2 in this way, the pressure on the inflow side may drop suddenly, or
It is possible to reduce the pressure shock that occurs when the pressure on the outflow side increases suddenly.

(Effects of the Invention) The check valve of the present invention operates as described above by being configured as described above, so that the following excellent effects can be obtained.

(1) When the fluid flows forward from the inflow side to the outflow side, a sufficiently large flow area is obtained, the fluid resistance is small, and the pressure drop is small. In particular, since pressure is likely to spread from the top opening of the valve body to the inner wall of the valve body, the valve member can be moved quickly.

(2) During backflow, where the pressure on the inflow side is lower than the pressure on the outflow side, the pressure first escapes from the top opening of the valve body, and by the time the forward flow has almost stopped, the valve member returns to its original position due to the elastic force of the spring member. Since the opening of the valve body is closed, no backflow occurs and therefore no water hammer phenomenon occurs.

(3) The elastic material is reliably moved in the axial direction of the flow path by the support shaft, and the valve member made of the elastic material does not deform much and water hammer does not occur as described above, so the valve member is not damaged. First, it has been around for a long time.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing one embodiment of the check valve of the present invention, Fig. 2 is a longitudinal sectional view showing another embodiment of the same as above, and Fig. 3 is an exploded view of the check valve of Fig. 2. FIG. 4 is a partially cutaway perspective view showing the operating state of the check valve of FIG. 2, and FIGS. It is a half-cut perspective view for explaining an example, and FIG. 6 and FIG. 7 are longitudinal sectional views each showing an example of a conventional check valve. 1...Valve body, 1a...Opening, 1b...Opening provided at the tip, 1d...Bulging part of the valve body,
2... Valve seat member, 3... Support shaft, 4... Spring member, 5... Guide member, 6... Housing.

Claims (1)

[Scope of utility model registration request] A tapered cage-shaped valve body having a plurality of openings on a slope and fixed to a flow channel with its tip facing the inflow side of the flow channel, and a cap-shaped valve member made of an elastic material attached to the inside of the valve body. In the check valve, an opening is formed at the top of the distal end of the valve body, and a guide member having a plurality of fluid ports is provided at a position on the outflow side of the flow path of the valve body with respect to the flow path. fixedly, and a support shaft is slidably mounted in the flow path direction at the center of this guide member,
The tip of this support shaft is fixed to the inside of the tip of the valve member, and a flange is formed in the middle of this support shaft to lock onto a part of the guide member. A check valve characterized in that the valve member is pressed against the valve body by the elastic force of the spring member.