JP2005009506A - Check valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve acting as a check valve even if fixed in any direction and usable without any trouble even if a fluid used in in it is hydrogen. <P>SOLUTION: This check valve is so formed that either of valve seats 2 and 2' and valve elements 1 and 1' allowing the fluid to flow therein are formed of magnets and the others are formed of magnetic substances attracted by the magnets. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a check valve that uses one of a valve body and a valve seat as a magnet, and more particularly to a check valve that can prevent leakage of gas such as hydrogen.
[0002]
[Prior art]
Conventionally, various check valves have been used for the purpose of preventing backflow by being disposed in a fluid flow path. Conventionally, a check valve that is generally used has a side of a valve body fixed like a door, and opens and closes along the flow of fluid to function as a check valve. Since it is designed to close by the weight of the body, there is a problem that the check valve does not work if it is installed in a place where the flow rate flows from top to bottom. A check valve using a spring is also known. However, when the fluid is hydrogen or the like, the spring has a problem that it cannot be used because brittle fracture occurs.
[0003]
Recently, various types of fuel cells have been developed, and the need for a check valve used therefor is increasing. However, hydrogen is the main fuel for fuel cells. However, conventional check valves cannot prevent hydrogen from leaking, and also have problems that cause brittle fracture due to hydrogen. . Therefore, there is no known check valve that can be used in a hydrogen fuel cell.
[0004]
[Problems to be solved by the invention]
The present invention is intended to solve such a problem. A check valve that acts as a check valve no matter what direction is fixed and can be used without any problem even if the fluid is hydrogen. The purpose is to provide.
[0005]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention that meets the above object is characterized in that one of the valve seat and the valve body into which a fluid can flow is formed as a magnet, and the other is formed of a magnetic body that is attracted by the magnet.
[0006]
Preferably, the valve body is coated with rubber or plastic and the valve seat is formed of magnetic stainless steel, or the magnetic body is coated with rubber or plastic (claim 2). It is particularly preferable to use Teflon as rubber or plastic.
[0007]
It is preferable that the valve body is separated from the valve seat by flowing the fluid from the through hole formed in the valve seat, and the fluid flows out from the outflow hole formed in the chamber on the valve body side. . In this case, the valve element may be completely separated or may be partially separated like a door.
[0008]
The valve body may be spherical, and fluid may flow out between the valve body and the indoor side wall on the valve body side.
[0009]
When a valve seat into which a fluid can flow is formed on a tapered inclined surface toward the through hole of the valve seat and the valve body is adsorbed via an o-ring located on the tapered surface, This is preferable because hydrogen leakage hardly occurs (claim 5).
[0010]
The valve seat is formed in a male nut shape (tubular body) having a through-hole into which fluid flows in the center, and a cap nut-like body having a fluid outlet is screwed onto the valve seat upper end outer thread portion. (Claim 6).
[0011]
A valve body that adsorbs to a first valve seat having a through-hole into which a fluid flows, a rod connected to the rear end of the valve body, a second valve seat that fits and holds the rod, and the second A through hole formed in the valve seat through which the fluid flows out, and a spacer that closes the valve body and the second valve seat so as not to block the through hole through which the fluid flows out. By doing so, the valve body can have a shape other than a spherical shape (claim 7).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0013]
1 and 2 show an example in which the valve body 1 is a spherical magnet and the male nut-shaped valve seat 2 is formed of magnetic stainless steel. In this embodiment, the valve body 1 is formed by coating a spherical magnet (magnet ball magnetic steel) with Teflon (registered trademark) (fluororesin). Teflon coating is preferred, although it can be coated with rubber or other plastics. Conversely, the valve seat 2 may be a magnet, and the valve body 1 may be formed of magnetic stainless steel. In addition, the valve seat portion with which the valve body 1 contacts is formed by coating a magnetic material or magnet with rubber or plastic, preferably Teflon (registered trademark), and this is fitted and fixed to the upper end of the male nut-shaped valve seat 2. May be.
[0014]
The reason why the magnetic stainless steel is used in the above embodiment is to prevent the magnetic body from rusting, and it is possible to coat the magnetic body such as iron with rubber or plastics (preferably Teflon). Absent.
[0015]
A through hole 3 into which a fluid flows is formed in the center of the male nut-shaped valve seat 2. An upper end surface of the valve seat 2 is formed on an inclined surface 4 reaching the through-hole 3, and an o-ring 5 coated with Teflon (registered trademark) is attached to a ring-shaped groove (not shown) formed on the inclined surface 4. ing. By configuring in this way, the valve body 1 strongly presses the o-ring 5 by magnetic force, so that it is possible to prevent leaking fluid such as hydrogen. If the valve body 1 is coated with rubber or plastics (preferably Teflon (registered trademark)), or the valve body contact portion of the valve seat 2 is coated with rubber or plastics (preferably Teflon (registered trademark)). Since it can be prevented from leaking even with hydrogen or the like, the o-ring 5 may be omitted. However, the o-ring 5 is preferably attached to make it more difficult to leak.
[0016]
The upper end of the valve seat 2 is formed in a flange, and a cap nut-like body 7 is screwed to the flange outer peripheral thread portion 6. The connecting surface of the cap nut-like body 7 is formed in a recess 8, and a concave fluid inflow chamber 9 is formed in the center of the recess 8. The recess 8 is screwed into the male screw 6 on the outer periphery of the flange with a female screw 10 on the side wall.
[0017]
An o-ring 5 ′ coated with Teflon (registered trademark) is interposed between the concave portion 8 of the cap nut-like body 7 and the upper end contact portion of the valve seat 2. A fluid outlet 11 is formed in the side wall of the fluid inflow chamber 9. As shown by the arrow in FIG. 2, when a fluid is introduced from the inlet of the valve seat through hole 3, the valve body 1 rises away from the valve seat 2 due to the pressure, and the fluid is formed on the indoor side wall on the valve body 1 side. It flows out from the outflow port 11 made.
[0018]
The check valve shown in FIGS. 1 and 2 may be mounted upside down or so as to allow fluid to flow from the lateral direction. In such a case, the valve body 1 can be returned by a magnetic force even if it contacts the upper wall of the cap nut-like body 7, or the fluid can flow out in the lateral direction as shown in FIG. The valve body 1 may be configured not to move to a position where it does not return by magnetic force.
[0019]
The strength (Gauss) of the magnet ball 1 is proportional to the blow-off pressure of the check valve, and the strength of the magnet that is attracted is selected unless the pressure of the fluid flowing from the inlet is applied.
[0020]
3 and 4 show another embodiment of the present invention, in which a first cylindrical valve seat 2 ′ is fitted and fixed in a cylindrical housing 15. The first valve seat 2 'is arranged so that the valve body 1' is attracted by magnetic force. A rod 12 is connected to the rear end of the valve body 1 ′, and the rod 12 is fitted and held in a concave hole 13 formed in the second valve seat 14.
[0021]
A through hole 15 through which fluid flows out is formed in the second valve seat 14, and a cylindrical spacer 16 is fixed to the back surface of the valve body 1 ′. The spacer 16 is fitted to the rod 12.
[0022]
FIG. 3 shows the closed state. When the fluid flows in from the fluid inlet 3 ′ of the valve seat 2 ′ and the valve body 1 ′ is pushed down to the open state shown in FIG. 4, the second valve seat is formed by the spacer 16. Since the 14 through holes 15 are kept open, the fluid flows out from the through holes 15.
[0023]
In the above embodiment, the tip of the valve body 1 ′ is formed in a trapezoidal cross section obtained by cutting the upper part of the cone in the lateral direction, and the valve body 1 ′ contact portion 17 of the valve seat 2 ′ is formed on the valve body 1 ′. It is formed in an opening having a trapezoidal cross section obtained by cutting the upper end of the cone so as to be in close contact.
In the above embodiment, the valve bodies 1 and 1 ′ are configured to be completely separated from the valve seats 2 and 2 ′, but this is not necessarily required. The valve body may be configured to open and close while the one end is fixed to the valve seat like the door.
[0024]
According to the present invention, since the valve is closed by magnetic force, it can be installed without any trouble even in the direction in which the valve is opened by gravity. Further, since it is possible to completely adhere and adsorb by magnetic force, it is possible to effectively prevent leakage of gas such as hydrogen. Furthermore, since the material can be made of Teflon (registered trademark) or stainless steel, brittle fracture can be prevented even when hydrogen or the like is used, so that it can be used without any problem as a check valve for a fuel cell.
【The invention's effect】
As described above, according to the present invention, the valve body is configured to be closed by magnetic force, so that it can act as a check valve and can be sealed by magnetic force regardless of the position. Therefore, the present invention can be applied to a gas that easily leaks, such as hydrogen, which could not be achieved in the past without any problem. Therefore, it greatly contributes to the development of such a fuel cell that has a strong demand for a check valve.
[0025]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state where the valve body of FIG. 1 is opened.
FIG. 3 is a cross-sectional view showing another embodiment of the present invention.
4 is a cross-sectional view of a state in which the valve body of FIG. 3 is open.
[Explanation of symbols]
1, 1 'valve body 2, 2' valve seat 3 through-hole 4 into which fluid flows in valve body contact surface 5, 5 'o-ring 7 of the valve seat 9 cap nut-like body 9 fluid inflow chamber 11 fluid outlet 12 rod 15 Second valve seat through hole 16 Spacer

Claims (7)

A check valve characterized in that one of a valve seat and a valve body into which a fluid can flow is a magnet, and the other is a magnetic body adsorbed by the magnet. 2. The check valve according to claim 1, wherein the valve body is coated with rubber or plastic and the valve seat is formed of magnetic stainless steel, or the magnetic body is coated with rubber or plastic. 3. The structure according to claim 1, wherein the valve body is separated from the valve seat by allowing the fluid to flow in from a through hole in the center of the valve seat, and the fluid is allowed to flow out from an outflow hole formed in the chamber on the valve body side. Check valve. The check valve according to any one of claims 1 to 3, wherein the valve body has a spherical shape, and fluid flows out between the valve body and the inner wall of the valve body. A valve seat into which a fluid can flow is formed on a tapered inclined surface facing the through hole of the valve seat, and the valve body is adsorbed by a magnetic force through an o-ring positioned on the tapered surface. Item 5. The check valve according to any one of Items 2 to 4. The valve seat is formed in a male nut shape having a through-hole into which a fluid flows, and a cap nut-like body having a fluid outlet is screwed into the valve seat upper end outer threaded portion. A check valve according to claim 1. A valve body that adsorbs to a first valve seat having a through-hole into which a fluid flows, a rod connected to the rear end of the valve body, a second valve seat that fits and holds the rod, and the second A through hole formed in the valve seat through which the fluid flows out, and a spacer that closes the valve body and the second valve seat so as not to block the through hole through which the fluid flows out. Item 7. The check valve according to any one of Items 1 to 6.

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