JP2011099487A - Bevel valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bevel valve excellent in sealing performance and responsiveness, in particular, in micro-pressure responsiveness. <P>SOLUTION: The bevel valve 1 for limiting the movement of fluid in one direction from a distribution hole 7 by forming a flow passage having a flow passage bulkhead 6 having one or two or more distribution holes 7 includes a valve stem 2 fixed to a fitting hole 8 formed in a vicinity of the center of the flow passage bulkhead 6 and a bevel-shaped valve element 3 expanded toward the inner circumference of the flow passage from a part in a vicinity of an upper end of the valve stem 8. Two annular ribs 30, 31 are arranged at a part located at the outer circumferential side of the distribution hole 7 in the flow passage bulkhead 6 at a surface of the valve element at the opposing side to the flow passage bulkhead 6. One annular rib 30 is arranged in a vicinity of the outer circumference of the valve element, and the other annular rib 31 is arranged in a vicinity of the distribution hole 7 at a surface on the opposing side to the flow passage bulkhead 6. A valve element located between the two annular ribs 30, 31 is constituted to be curved toward the flow passage bulkhead 6. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an umbrella valve used as a check valve, a one-way valve, or the like, and more particularly to an umbrella valve excellent in sealing performance and responsiveness.

  Conventionally, as shown in FIG. 5, it is provided in a flow path 103 (for example, piping) having a flow path partition wall 102 having one or more flow holes 101, and fluid (for example, fuel, water, etc.) from the flow holes 101 is provided. It is used as a check valve, etc., with a function that restricts the movement of liquid in one direction (either from the top to the bottom or from the bottom to the top in the drawing) Umbrella type valves are known. The basic form of this umbrella-type valve is a valve shaft 105 fixed to a mounting hole 104 formed near the center of the flow path partition wall 102, and from the vicinity of the tip of the valve shaft 105 toward the flow path inner periphery 106. An umbrella-shaped valve body 107 made of a rubber-like elastic body that expands.

  The umbrella valve in FIG. 5 has a structure in which fluid flows out from the flow hole 101 from below to above the flow path 103 but does not flow out from above to below. When there is pressure fluctuation above and below the flow path partition wall 102, for example, when the lower pressure is lower than the upper side, the valve body 107 is in surface contact with the flow path partition wall 102. As a result, the flow hole 101 is closed and The fluid does not flow out through the flow hole 101, that is, does not flow backward.

  Also, as an umbrella-type valve, there is also known an umbrella-type valve provided with a single annular rib which is an improvement on the above-described type of only surface contact (Patent Documents 1 and 2). Patent document 1 is disclosing the check valve (check valve) excellent in the response response with respect to the micro pressure fluctuation | variation which provided the 1st ring rib in the outer periphery vicinity of the valve body.

Japanese Utility Model Publication No. 52-78139 JP 2008-303951 A: The annular rib described in this publication does not have a sealing property.

  In an umbrella-type valve, excellent sealing performance and responsiveness are the basic required performance. However, in recent years, the demand for responsiveness to micro pressure fluctuations has been increasing. There is no mold valve available, and further improvements are required.

  The present inventor has analyzed the relationship between the surface pressure of the structure and the flow path partition with respect to the sealing performance and responsiveness required for the umbrella-type valve.

  Specifically, the surface contact type umbrella valve shown in FIG. 5 (the average thickness of the valve body is about 0.5 mm) is attached to the channel partition, and the lower part of the channel partition is 0.067 MPa (below atmospheric pressure). In other words, the surface pressure in the surface pressure measurement range was measured by FEM analysis so that the fluid was pulled downward with a negative pressure. The measurement results are shown in FIG. At the same time, a sealability test (sealability test) and a micro-pressure response test were conducted as needed.

From FIG. 6, it can be seen that the surface pressure is high and the sealing performance is excellent in the vicinity of the starting point of the surface pressure measurement range (the part where the valve element 107 is first in contact with the flow path partition wall 102). It was found that the surface pressure decreased extremely toward the end point, and most of the valve element 107 did not contribute to the sealing performance. Further, in the case of such a surface contact type, when valve opening pressure is applied, the valve element 107 is opened so that the valve element 107 gradually lifts from the start point of the contact surface toward the end point. In addition, it was found that the responsiveness, particularly the micro-pressure responsiveness is insufficient.

  Moreover, in the aspect (refer FIG. 7) which provides the 1st ring rib 108 in the valve body front-end | tip inner surface described in patent document 1, as shown in FIG. 8, the surface pressure 108p tends to be high in the vicinity of the annular rib 108. FIG. As shown, even if such a high surface pressure 108p is shown, the surface pressure 107ap in the vicinity of the starting point is low, so once the valve body 107 is turned up, the pulsation is directed from the starting point toward the end point. It was found that the sealability (sealability) could not be ensured only by the surface pressure 108p having a high end point. Further, since the surface contact similar to the surface contact type umbrella valve shown in FIG. 5 is formed on the starting point side of the surface pressure measurement range, the response, particularly the micro-pressure response is still insufficient.

  Accordingly, an object of the present invention is to provide an umbrella-type valve that is excellent in sealing performance and excellent in responsiveness, in particular, fine pressure responsiveness.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
In an umbrella-type valve that is provided in a flow path having a flow path partition wall having one or more flow holes, and restricts movement of fluid from the flow holes in one direction,
A valve shaft fixed to a mounting hole drilled near the center of the flow path partition, and an umbrella-shaped valve body that expands from the vicinity of the upper end of the valve shaft toward the inner periphery of the flow path,
Two annular ribs are arranged on a portion of the valve body on the side facing the flow path partition wall and located on the outer peripheral side of the flow hole of the flow path partition wall, and one annular rib is the valve Arranged in the vicinity of the outer periphery of the body, the other annular rib is arranged in the vicinity of the flow hole on the surface facing the flow path partition,
An umbrella-type valve characterized in that a valve body portion located between the two annular ribs is configured to bend toward the flow path partition wall.

(Claim 2)
2. The umbrella valve according to claim 1, wherein the valve body portion positioned between the two annular ribs is formed of an elastic member and / or formed with a bendable thickness.

(Claim 3)
The umbrella-shaped valve according to claim 1 or 2, wherein each of the two annular ribs has a spherical contact portion with the flow path partition wall.

(Claim 4)
The umbrella valve according to any one of claims 1 to 3, wherein the lowermost end of the curved portion does not contact the flow path partition wall.

  ADVANTAGE OF THE INVENTION According to this invention, the umbrella type | mold valve | bulb excellent in sealing property and responsiveness, especially excellent in a micro-pressure response can be provided.

Schematic half sectional view showing an example of an umbrella type valve of the present invention The figure explaining the surface pressure measurement range of the umbrella type valve of the present invention The figure which shows the surface pressure measurement result of the umbrella type | mold valve of this invention The figure explaining the function of the umbrella-type valve of this invention, and an effect The figure explaining the surface pressure measurement range of a surface contact type umbrella type valve The figure which shows the surface pressure measurement result of the surface contact type umbrella type valve The figure explaining the surface pressure measurement range of the umbrella type valve of the tip one piece annular rib The figure which shows the surface pressure measurement result of the umbrella type valve of the tip one piece annular rib The figure explaining the surface pressure measurement range of the umbrella type valve of the single ring annular rib near the circulation hole The figure which shows the umbrella-type valve surface pressure measurement result of the single ring annular rib near the circulation hole

  Hereinafter, modes for carrying out the present invention will be described.

  FIG. 1 is a schematic half-sectional view showing an example of an umbrella-type valve of the present invention. In FIG. 1, reference numeral 1 denotes an umbrella-type valve, which basically includes a valve shaft 2 and a valve body 3. Yes.

  The umbrella-type valve 1 of the present invention plays a role of restricting the flow of a fluid (for example, a liquid such as oil or water, a gas, etc.) flowing in a flow path 5 formed inside a pipe 4 or the like in one direction. It is used as a check valve (check valve), a one-way valve, in particular, a check valve excellent in micro-pressure responsiveness that has recently been demanded. The umbrella valve of the present invention can also function as a safety valve such as a tank. In the following description, a case where it is mainly used as a check valve for preventing a back flow in a flow path such as a pipe will be described.

  Reference numeral 6 denotes a flow path partition, which is fixed in close contact with the inner periphery 40 of the pipe 4 (in the present invention, this is called the flow path inner periphery) in order to block the flow path 5. The fixing means of the flow path partition 6 is not particularly limited. One or two or more flow holes 7 are formed in the flow path partition 6. The flow hole 7 is a through hole that allows the fluid to move in one direction via the flow path partition 6.

  The valve shaft 2 of the umbrella-type valve 1 is fixed to a mounting hole 8 formed near the center of the flow path partition wall 6. The fixing means is not particularly limited as long as it can be reliably fixed and does not easily disengage. The valve shaft 2 can be formed integrally with the valve body 3 with a rubber elastic body.

  The valve body 3 only needs to have an umbrella shape. Specifically, the valve body 3 may be configured to expand from the vicinity 20 of the upper end of the valve shaft 2 toward the inner periphery 40 of the flow path. Since the material and the material of the valve body 3 function as a valve, they are formed of a material and a material that can be elastically deformed to such an extent that the object of the present invention can be achieved with respect to pressure fluctuations in the flow path, particularly minute pressure fluctuations. Preferably, it is formed of a rubber elastic body.

  A feature of the shape of the umbrella-type valve of the present invention is that it includes two annular ribs 30 and 31.

  The two annular ribs 30 and 31 are formed on the valve body 3, but both are formed on the surface facing the flow path partition 6.

  The annular rib 30 may be formed in the vicinity of the tip 32 of the valve body 3, but may be provided on the inner surface of the valve body 3 at a position about several mm away from the tip of the valve body 3.

The annular rib 31 is a portion located on the inner surface side of the valve body 3 on the outer peripheral side of the flow hole 7 of the flow path partition wall 6, that is, on the flow path inner periphery 40 side (this positional relationship is a negative pressure suction below the flow path partition wall 6. In this state, the positional relationship in the state where the annular rib 31 is in contact with the flow path partition wall 6 is provided.

  The two annular ribs 30, 31 are made of the same elastically deformable material or material as that of the valve body 3, preferably a rubber elastic body, and can be formed integrally with the valve body. The shape may be a shape in which the contact point with the partition wall is a point contact (when the contact portion is spherical), or a shape in which the surface contact is about several μ to several mm (slightly elliptical from the forming accuracy) Case).

  In the present invention, the valve element portion 33 located between the two annular ribs 30 and 31 is preferably configured to be bendable toward the flow path partition wall 6. This can be realized by selecting an appropriate material and / or adjusting the thickness of the rubber valve body.

  Next, the function and effect of the umbrella valve of the present invention having the above-described configuration will be clarified by experimental facts.

  As shown in FIG. 1, the umbrella-type valve 1 is attached to the flow path partition 6, a negative pressure is drawn from the flow hole 7, and the flow path below the flow path partition 6 is set to 0.067 MPa. The surface pressure in the surface pressure measurement range was measured by FEM analysis in a state elastically deformed as shown in FIG. At the same time, sealability (sealability) and micro-pressure response were also measured. The dimensions of the valve used were as follows: the distance between the annular rib 30 and the annular rib 31 was 3.0 mm, the height of both annular ribs was 0.3 mm, and the average thickness of the valve body 3 at the curved portion 33 was about 0.5 mm. did.

  As shown in FIG. 2, the starting point of the surface pressure measurement range is in the vicinity of the contact portion of the annular rib 31, and the end point is in the vicinity of the contact portion of the annular rib 30. The measurement results are shown in FIG.

  3 was detected at the position of the annular rib 31, and the peak 30 p at the end point was detected at the position of the annular rib 30.

  The surface pressure peaks 30p and 31p derived from the annular ribs 30 and 31 are both narrow in width and exhibit high surface pressure, and show good results in sealing performance and fine pressure response.

  As shown in FIG. 4, what is important in the present invention is the configuration in which the valve element portion 33 between the annular ribs 30, 31 is curved toward the flow path partition 6 due to the presence of the two annular ribs 30, 31. Therefore, the vector a acting downward is distributed to the vectors b and c in the direction in which the two annular ribs 30 and 31 press the flow path partition wall 6, thereby realizing a surface pressure peak in the vicinity of the two annular ribs 30 and 31. Is.

  The sealing performance of the umbrella valve of the present invention depends on the two surface pressure peaks 30p and 31p and can be completely realized.

  Furthermore, when the surface pressure peaks 30p and 31p are present at the start point and the end point, it seems that the sealing performance is excellent, but it becomes a responsiveness inhibiting factor. From the experiments of the present inventor, it is found that the responsiveness is also good. It was. This is presumed to be due to the following reason.

  First, when the valve opening pressure is applied to reduce the surface pressure of the annular rib 31, the seal surface formed between the annular rib 31 and the flow path partition 6 disappears, and the curved portion (between the annular ribs 30 and 31). The negative pressure that curved the valve body portion 33 in the direction of the flow path partition wall is canceled out, and the elastic restoring force instantaneously moves in the opposite direction to the flow path partition wall 6, and accordingly, the annular rib 30 also quickly moves. Is lifted in the opposite direction to the flow path partition 6.

  In addition, the two annular ribs 30 and 31 made of an elastically deformable material or a material retain an elastic restoring force by being pressed in the direction of the flow path partition 6 when sealed, but when a valve opening pressure is applied. The pressure in the direction of the flow path partition 6 is canceled and the elastic restoring force is released. Since this elastic restoring force becomes an instantaneous force that lifts the two annular ribs 30 and 31 in the direction opposite to the flow path partition 6, the contact between the two annular ribs 30 and 31 and the flow path partition 6 is instantly released. In order to favorably preserve the elastic restoring force in the two annular ribs, the shape of the two annular ribs 30 and 31 is formed so as to be appropriately deformed by the surface pressure. It is preferable that each contact portion of the rib with the flow path partition is spherical.

  Further, since the surface contact between the valve body 3 and the flow path partition 6 is obstructed by the two annular ribs 30 and 31, it is due to the surface contact observed in the case of the surface contact type umbrella type valve shown in FIG. Response delay has been greatly eliminated.

  In FIG. 3, a slight surface pressure 33p is generated at the intermediate portion. However, since the surface pressure can be made zero by making the curved portion 33 not contact the wall surface, the response From the viewpoint of safety, the slight surface pressure 33p is not important. In the present invention, a state without such contact is preferable, and there is no limitation as long as the structure does not contact, but the limitation of the bending force (material, thickness, etc.) of the bending portion or the distance between the two annular ribs 30 and 31 is adjusted. Then, limiting the height of the lowermost end of the curved portion can be mentioned.

  Compared with the umbrella-type valve provided with the single-ended annular rib 108 shown in FIG. 7, the umbrella-type valve of the present invention forms a high surface pressure 31p even near the start point, so that the valve body 3 on the start point side is turned. There is no such thing as going up and causing pulsation. The umbrella-type valve of the present invention is excellent in sealing performance because it can be double-sealed by high surface pressure peaks 30p and 31p formed on both sides of the start point and the end point.

  Incidentally, in FIG. 3, since the high surface pressure 31 p is detected by the annular rib 31 provided on the side close to the flow hole 7, only a slight negative pressure acts on the annular rib 30 compared to the annular rib 31. It is expected not to. Nevertheless, a high surface pressure 30p is detected in the annular rib 30 as well. It was completely unexpected that the surface pressure 30p was not different from the surface pressure obtained when the single-ended annular rib 108 shown in FIG. 7 was provided.

  This phenomenon cannot be explained only by the action of the negative pressure. The bending portion 33 formed between the two annular ribs 30 and 31 is bent, and the elastic restoring force generated at that time is annular. It is presumed that the rib 30 acts to press the rib 30 against the surface of the flow path partition wall 6 and thereby an umbrella valve excellent in sealing performance and fine pressure response is obtained.

  In addition, when the single annular rib 108 shown in FIG. 7 is provided, the surface pressure 107ap from the starting point to the intermediate portion is about 0.05 MPa, which causes a delay in response and a delay in response to fine pressure. 2, when the two annular ribs 30 and 31 are provided, the two annular ribs 30 and 31 obstruct surface contact between the valve element 3 and the flow path partition wall 6, so that the surface pressure up to the intermediate portion is zero. Close to. As a result, since it only depends on the peak 33p, there is no delay in response.

  Furthermore, the present inventor also examined a mode (see FIG. 9) in which a single annular rib 109 is provided on the inner surface portion of the valve body 107 located in the vicinity of the flow hole 101, and measured the surface pressure, the sealing test, and the micro-pressure response. Tested. As shown in FIG. 10, a high surface pressure 109p is shown in the vicinity of the start point of the surface pressure measurement range, but the surface pressure 107bp detected on the end point side is low, and the start point side and end point side as in the present invention are low. Double sealing is not possible due to the high surface pressure peaks 30p and 31p formed on both sides. For this reason, the sealing performance was poor.

  Further, since the surface pressure 107 bp is formed on the end point side of the surface pressure measurement range, the same surface contact as the surface contact type umbrella type valve shown in FIG. 5 is formed on the end point side of the surface pressure measurement range. You can see that Therefore, compared with the umbrella-type valve of the present invention in which the surface contact is greatly reduced by the two annular ribs, the responsiveness, particularly the micro-pressure responsiveness is insufficient.

1: Umbrella type valve 2: Valve shaft 3: Valve body 6: Flow path partition wall 7: Flow hole 8: Mounting hole 30, 31: Annular rib 33: Curved part

Claims (4)

In an umbrella-type valve that is provided in a flow path having a flow path partition wall having one or more flow holes, and restricts movement of fluid from the flow holes in one direction,
A valve shaft fixed to a mounting hole drilled near the center of the flow path partition, and an umbrella-shaped valve body that expands from the vicinity of the upper end of the valve shaft toward the inner periphery of the flow path,
Two annular ribs are arranged on a portion of the valve body on the side facing the flow path partition wall and located on the outer peripheral side of the flow hole of the flow path partition wall, and one annular rib is the valve Arranged in the vicinity of the outer periphery of the body, the other annular rib is arranged in the vicinity of the flow hole on the surface facing the flow path partition,
An umbrella-type valve characterized in that a valve body portion located between the two annular ribs is configured to bend toward the flow path partition wall.   2. The umbrella valve according to claim 1, wherein the valve body portion positioned between the two annular ribs is formed of an elastic member and / or formed with a bendable thickness.   The umbrella-shaped valve according to claim 1 or 2, wherein each of the two annular ribs has a spherical contact portion with the flow path partition wall.   The umbrella valve according to any one of claims 1 to 3, wherein the lowermost end of the curved portion does not contact the flow path partition wall.