WO2012023396A1

WO2012023396A1 - Forward check valve and fuel-cell system

Info

Publication number: WO2012023396A1
Application number: PCT/JP2011/067126
Authority: WO
Inventors: 東山祐三
Original assignee: 株式会社村田製作所
Priority date: 2010-08-20
Filing date: 2011-07-27
Publication date: 2012-02-23
Also published as: JP5510551B2; JPWO2012023396A1

Abstract

Disclosed are a forward check valve and fuel-cell system wherein a diaphragm is prevented from sticking to the bottom surface of a valve chamber, even in a low-profile structure. Inside a valve housing (130), an annular first protruding part (144), against which a diaphragm (120) abuts when a valve part (150) is opened, and first channels (145), which let methanol flow from inside the protruding part (144) to outside, are formed around an inlet (143) in the bottom surface (141) of the valve chamber (140). Thus in the disclosed forward check valve (101), when the valve part (150) is opened, the rubber diaphragm (120) contacts the first protruding part (144), not the bottom surface (141) of the valve chamber (140). Also, when the diaphragm (120) is in contact with the first protruding part (144), methanol flows outside the first protruding part (144) from inside said first protruding part (144) via the first channels (145).

Description

Stop valve, fuel cell system

The present invention relates to a stop valve for controlling the forward flow of a fluid, and a fuel cell system including the stop valve.

Patent Document 1 discloses a passively driven pressure reducing valve used for a small fuel cell. The pressure reducing valve is configured to automatically open and close using a pressure difference when the fluid pressure reaches a set pressure.

1A and 1B are sectional views of a pressure reducing valve disclosed in Patent Document 1. FIG. The pressure reducing valve includes a diaphragm 1 serving as a movable portion, a piston 2 serving as a transmission mechanism, a valve housing 7, a valve seat portion 3 forming a valve portion, a valve body portion 4, and a support portion 5. The valve body portion 4 is supported around the support portion 5. The support part 5 is formed of an elastic beam. The valve housing 7 constitutes a valve chamber 8 together with the diaphragm 1.

The upper pressure of the diaphragm (movable part) 1 is P0, the primary pressure upstream of the valve is P1, the pressure downstream of the valve is P2, the area of the valve body part 4 is S1, and the area of the diaphragm (movable part) 1 is S2. . At this time, from the balance of pressure, the condition for opening the valve as shown in FIG. 1B is (P1-P2) S1 <(P0-P2) S2. If P2 is higher than the pressure in this condition, the valve is closed, and if P2 is lower, the valve is opened. Thereby, P2 can be kept constant.

JP 2008-59093 A

For example, a direct methanol fuel cell (DMFC) has a pump for transporting fuel (methanol). In general, a valve-type pump has a check function by a valve, but does not have a stop function (a function to stop a forward flow). When a pump without a stop function is used, when upstream pressure (forward pressure) is applied to the fuel, the fuel flows even when the pump is not operating.

Also, the fuel cartridge incorporated in the fuel cell system may become hot depending on the external environment, and high pressure fluid may be discharged. As a result, excessive fluid may be supplied to the fuel cell or the pump may be destroyed in some cases. Therefore, there is a need for a valve that stops forward flow (hereinafter referred to as a stop valve) when a high-pressure fluid is added. In the pressure reducing valve of Patent Document 1 shown in FIGS. 1 (A) and 1 (B), the diaphragm 1 is moved by the suction pressure of the fluid by the pump, and the valve body portion 4 is pushed down by the interlocking piston 2 so that the valve open. This opens the fluid flow path.

However, when the distance between the bottom surface 9 of the valve chamber 8 facing the diaphragm 1 and the diaphragm 1 is reduced and the pressure reducing valve of Patent Document 1 is lowered, the diaphragm 1 is placed on the bottom surface 9 of the valve chamber 8 when the valve is opened. There is a risk of contact. When the diaphragm 1 of the pressure reducing valve is made of rubber and a highly active fluid such as methanol is used for the pressure reducing valve, the diaphragm 1 swells with the fluid when the diaphragm 1 comes into contact with the bottom surface 9 of the valve chamber 8. There is a possibility that the diaphragm 1 and the bottom surface 9 of the valve chamber 8 are fixed. Therefore, in the structure in which the pressure reducing valve of Patent Document 1 has a low profile, the diaphragm 1 may not return to its original position due to the adhesion between the diaphragm 1 and the bottom surface 9 of the valve chamber 8, and the valve may not close. .

Therefore, in the conventional stop valve having a structure in which the pressure reducing valve of Patent Document 1 has a low profile, when the diaphragm is formed of rubber and a highly active fluid is used for the stop valve, sufficient fluid control is achieved. There was a problem that reliability could not be obtained.

Therefore, an object of the present invention is to provide a stop valve that can prevent the diaphragm and the bottom surface of the valve chamber from sticking to each other even in a low-profile structure, and a fuel cell system including the stop valve.

The stop valve of the present invention has the following configuration in order to solve the above problems.

(1) a valve housing;
Comprising a valve chamber together with the valve housing, and a diaphragm displaced by the pressure of fluid in the valve chamber;
The valve housing has an inflow hole through which fluid flows into the valve chamber, and an outflow hole through which fluid flows out of the valve chamber due to the suction pressure of the fluid by the pump. A stop valve,
A valve body disposed in the inflow hole and configured to block or open the inflow of fluid from the inflow hole to the valve chamber by displacement of the diaphragm;
The valve housing has a first protrusion with which the diaphragm comes into contact when the valve body releases the inflow of fluid from the inflow hole to the valve chamber, and the fluid is supplied to the first protrusion. A first flow path that passes from the inside to the outside of the part is formed around the inflow hole on the bottom surface of the valve chamber facing the diaphragm.

In this configuration, the diaphragm comes into contact with the first protruding portion instead of the bottom surface of the valve chamber when the valve is opened. Furthermore, when the diaphragm comes into contact with the first protrusion, the fluid passes from the inside of the first protrusion to the outside of the first protrusion via the first flow path.
Therefore, even when a highly active fluid is used for the stop valve of this configuration, since the diaphragm does not contact the bottom surface of the valve chamber, it is possible to prevent the diaphragm swollen by the fluid and the bottom surface of the valve chamber from sticking.
Therefore, according to this configuration, it is possible to prevent the diaphragm and the bottom surface of the valve chamber from sticking even with a low-profile structure. Therefore, the reliability of fluid control can be improved.

(2) A pressure receiving plate that receives a differential pressure between an atmospheric pressure and an internal pressure of the valve chamber is joined to the diaphragm,
The first protrusion is Dc, where Dv is the inner diameter of the valve chamber, Db is the diameter of the pressure receiving plate, and Dc is the outer diameter of the first protrusion located at both ends of the inflow hole. It is preferably formed in a shape satisfying the relationship of ≦ (Dv + Db) / 4.

In this configuration, the pressure receiving plate is bent convexly to the opposite side with respect to the bottom surface of the valve chamber, and the diaphragm is in contact with the first protrusion at an angle. That is, since the diaphragm and the first protrusion are in line contact, the diaphragm and the first protrusion are difficult to adhere. In addition, even if the diaphragm and the first protrusion are fixed, when the pressure receiving plate tries to return to the original flat state from the bent state, a force to peel off the fixation works from the outside of the first protrusion. Therefore, the diaphragm is easily peeled off from the first protrusion.
Therefore, according to this structure, it can also prevent that a diaphragm and a 1st protrusion part adhere. Therefore, the reliability of fluid control can be further improved.

(3) It is preferable that the first protrusion is formed in a curved surface shape having a convex tip.

The first projecting portion having this configuration has a smaller contact area with the diaphragm when the valve is opened than the first projecting portion having a flat tip. Therefore, it is difficult for the diaphragm and the first projecting portion to adhere to each other. Further, even if the diaphragm and the first protrusion are fixed, the diaphragm is easily peeled off from the first protrusion.
Therefore, according to this structure, it can also prevent that a diaphragm and a 1st protrusion part adhere. Therefore, the reliability of fluid control can be further improved.

(4) It is preferable that the first protrusion is an aggregate of a plurality of protrusions.

The first projecting portion having this configuration has a smaller contact area with the diaphragm when the valve is opened than the first projecting portion having an integral structure. Therefore, it is difficult for the diaphragm and the first projecting portion to adhere to each other. Further, even if the diaphragm and the first protrusion are fixed, the diaphragm is easily peeled off from the first protrusion.
Therefore, according to this structure, it can also prevent that a diaphragm and a 1st protrusion part adhere. Therefore, the reliability of fluid control can be further improved.

(5) The valve housing includes a second protrusion having a height lower than that of the first protrusion, and a second flow path for allowing fluid to pass from the inside to the outside of the second protrusion. Preferably, it is formed inside the first protrusion on the bottom surface of the valve chamber and around the inflow hole.

In this configuration, when the valve is opened, the diaphragm comes into contact with the first protrusion and is locally compressed and deformed, and even if a part of the first protrusion bites into the diaphragm, the second protrusion causes the second protrusion. Therefore, a sufficient fluid flow path can be secured.
Therefore, according to the stop valve of this structure, since the 1st protrusion part is provided, sticking with a diaphragm and the bottom face of a valve chamber can be prevented. Furthermore, since the second protrusion is provided, a sufficient flow path can be secured even if the diaphragm comes into contact with the first protrusion when the valve is opened and the first protrusion bites into the diaphragm.

(6) In the valve housing, a third protrusion is formed on the periphery of the inflow hole on the bottom surface of the valve chamber,
It is preferable that the first protrusion is formed on an upper surface of the third protrusion that faces the diaphragm.

In this configuration, the thickness of the peripheral portion of the inflow hole in the valve housing is increased by providing the third protrusion. Thereby, the rigidity of the peripheral part of the inflow hole in the valve housing can be increased.
Therefore, according to this configuration, the rigidity of the peripheral portion of the inflow hole in the valve housing can be increased.

(7) The fluid is preferably methanol.

Methanol is a fluid with higher activity than other fluids. Therefore, the configuration (1) is suitable for this configuration using methanol as a fluid.

(8) Preferably, the material of the diaphragm is rubber, and the material of the portion of the valve housing that contacts the fluid is resin.

In this configuration, even when the fluid passes through the valve chamber, metal ions do not elute into the fluid. Therefore, according to this configuration, the degradation of the DMFC characteristics due to elution of metal ions does not occur.

Further, the fuel cell system of the present invention has the following configuration in order to solve the above problems.

(9) The stop valve according to any one of (1) to (8) above,
A fuel reservoir connected to the inflow hole of the stop valve;
And a pump connected to the outflow hole of the stop valve.

With this configuration, by using the stop valve described in any one of the above (1) to (8), the same effect can be obtained in a fuel cell system including the stop valve.

According to this invention, it is possible to prevent the diaphragm and the bottom surface of the valve chamber from sticking even with a low-profile structure. Therefore, the reliability of fluid control can be improved.

It is sectional drawing explaining the structure of the stop valve of patent document 1. FIG. It is a schematic cross section of a stop valve for explaining the operating principle of the stop valve. 1 is a system configuration diagram of a fuel cell system including a stop valve 101 according to a first embodiment of the present invention. It is a disassembled perspective view explaining the structure of the stop valve 101 which concerns on the 1st Embodiment of this invention. FIG. 5A is a top view of the cap part 110 provided in the stop valve 101 of FIG. FIG. 5B is a bottom view of the valve housing 130 provided in the stop valve 101 of FIG. FIG. 6 is a cross-sectional view taken along the line SS in FIG. It is a schematic cross section at the time of valve opening of the stop valve 101 which concerns on the 1st Embodiment of this invention. It is a perspective view of the valve housing | casing 230 with which the stop valve 201 which concerns on the 2nd Embodiment of this invention is equipped. It is a perspective view of the valve housing | casing 330 with which the stop valve 301 which concerns on the 3rd Embodiment of this invention is equipped. It is a perspective view of the valve housing | casing 430 with which the stop valve 401 which concerns on the 4th Embodiment of this invention is equipped. It is a perspective view of the valve housing | casing 530 with which the stop valve 501 which concerns on the 5th Embodiment of this invention is equipped. FIG. 12 is a cross-sectional view of main parts taken along line SS in FIG. 11. It is principal part sectional drawing of the valve housing | casing 630 with which the stop valve 601 which concerns on the 6th Embodiment of this invention is equipped. It is a perspective view of the valve housing | casing 730 with which the stop valve 701 which concerns on the 7th Embodiment of this invention is equipped. FIG. 15 is a main part cross-sectional view taken along line TT in FIG. 14.

《Operation principle of stop valve》
First, the principle of operation of a passively driven stop valve used in a small fuel cell will be described.
2A is a schematic cross-sectional view of the stop valve 90 in a state where the valve is closed, and FIG. 2B is a schematic cross-sectional view of the stop valve 90 in a state where the valve is open. The stop valve 90 includes a diaphragm 20 serving as a movable portion, a valve housing 30 that forms a valve chamber 40 together with the diaphragm 20, a cap portion 10 joined to the valve housing 30, and a valve portion 50 having a valve body portion 51. Consists of.

The valve housing 30 is formed with an inflow hole 43 through which the fluid flows into the valve chamber 40 and an outflow hole 49 through which the fluid flows out of the valve chamber 40 due to the suction pressure of the fluid by the pump.

The diaphragm 20 has a pusher 23 that is a transmission mechanism, and is displaced by the pressure of the fluid in the valve chamber 40. When the diaphragm 20 is displaced in a direction approaching the valve unit 50, the pusher 23 presses the valve body unit 51.

The valve portion 50 has a ring-shaped valve protrusion 55 formed on the inflow hole 43 side of the valve body portion 51, and the valve protrusion 55 is disposed so as to abut on a valve seat 48 positioned at the periphery of the inflow hole 43. The valve body 51 abuts or separates from the valve seat 48 due to the displacement of the diaphragm 20 to block or open the inflow of fluid from the inflow hole 43 to the valve chamber 40.

The cap part 10 is formed with a hole part 15 communicating with the outside air on the upper surface. As a result, atmospheric pressure is applied to the upper part of the diaphragm 20.

The stop valve 90 is configured such that when the fluid pressure reaches a set pressure, the valve unit 50 automatically opens and closes using the pressure difference. More specifically, the pressure of the atmosphere above the diaphragm 20 is P0, the primary pressure upstream of the valve is P1, and the pressure downstream of the valve is P2, and the area of the valve body 51 (here, the valve body 51 includes a ring-shaped valve). S1 is the area determined by the diameter of the region surrounded by the valve protrusion 55 because the protrusion 55 is formed, S2 is the area of the diaphragm 20, and Fs is the force that the valve body 51 is biased upward. At this time, from the balance of pressure, the condition for opening the valve unit 50 as shown in FIG. 2B is (P1−P2) S1 + Fs <(P0−P2) S2. When P2 is higher than the pressure under this condition, the valve unit 50 is closed, and when P2 is low, the valve unit 50 is opened. Thereby, P2 can be kept constant.

<< First Embodiment >>
Hereinafter, the stop valve 101 according to the first embodiment of the present invention will be described.
FIG. 3 is a system configuration diagram of the fuel cell system 100 including the stop valve 101 according to the first embodiment of the present invention. The fuel cell system 100 includes a fuel cartridge 102 that stores methanol as a fuel, a stop valve 101, a pump 103 that transports methanol, and a power generation cell 104 that receives the supply of methanol from the pump 103 and generates power. .

A direct methanol fuel cell (DMFC) includes a pump 103 that transports methanol as a fuel. In general, the valve-type pump 103 has a check function by a valve, but does not have a stop function. When the pump 103 without the stop function is used, when the upstream pressure (forward pressure) is applied to the methanol, the methanol flows even when the pump 103 is not operated.
Therefore, it is preferable to provide a stop valve 101 that is used in combination with the pump 103 and opens and closes the valve using the pump pressure.

Although the details of the stop valve 101 will be described later, the stop valve 101 includes a valve housing 130 that constitutes a valve chamber 140 together with the diaphragm 120. The valve housing 130 is formed with an inflow hole 143 to which the fuel cartridge 102 is connected via the inflow path 163 and an outflow hole 149 to which the pump 103 is connected via the outflow path 165. The stop valve 101 is mounted on the surface of a system housing 160 made of polyphenylene sulfide (PPS) resin, in which an inflow path 163 and an outflow path 165 are formed, via O-

rings

161 and 162 that prevent leakage.

In the fuel cell system 100, methanol flows from the fuel cartridge 102 into the valve chamber 140 through the inflow path 163 and the inflow hole 143. Then, methanol flows out from the valve chamber 140 to the pump 103 through the outflow passage 165 and the outflow hole 149 by the suction pressure of methanol by the pump 103. Then, methanol is supplied to the power generation cell 104 by the pump 103.

FIG. 4 is an exploded perspective view of the stop valve 101 according to the first embodiment. FIG. 5A is a top view of the cap part 110 provided in the stop valve 101 of FIG. FIG. 5B is a bottom view of the valve housing 130 provided in the stop valve 101 of FIG. FIG. 6 is a cross-sectional view taken along the line SS in FIG. FIG. 7 is a schematic cross-sectional view of the stop valve 101 according to the first embodiment of the present invention when the valve is opened.

The stop valve 101 includes a cap part 110, a diaphragm 120 serving as a movable part, a valve housing 130, and a valve part 150, as shown in an exploded perspective view in FIG. 4.

The valve housing 130 has a substantially square plate shape. The valve housing 130 is formed with an inflow hole 143 through which the fluid flows into the valve chamber 140 and an outflow hole 149 through which the fluid flows out from the valve chamber 140 due to the suction pressure of the fluid by the pump 103. ing. Further, the valve casing 130 has a cap section 110 and a screw fixing hole 131 for fixing the valve casing 130 to the system casing 160 and a mounting section 134 on which the peripheral edge 121 of the diaphragm 120 is mounted. And are formed.

Further, as shown in FIGS. 4, 6, and 7, the diaphragm 120 contacts the valve housing 130 when the valve unit 150 releases the inflow of methanol from the inflow hole 143 to the valve chamber 140. The first protrusion 144 and the first flow path 145 that allows methanol to pass from the inside to the outside of the first protrusion 144 are around the inflow hole 143 on the bottom surface 141 of the valve chamber 140 facing the diaphragm 120. Is formed. Here, the first protruding portion 144 has an inner diameter of the valve chamber 140 as Dv, a diameter of a pressure receiving plate 125, which will be described in detail later, as Db, and an outer diameter of the first protruding portion 144 positioned at both ends of the inflow hole 143. Is a shape satisfying the relationship of Dc ≦ (Dv + Db) / 4.

Further, as shown in FIGS. 5B and 6, the valve housing 130 is fitted with the valve portion 150 from the mounting surface side of the valve housing 130 to accommodate the valve portion 150, and A valve seat 148 positioned at the periphery of the inflow hole 143 is formed.

As for the material of the valve housing 130, the

materials

134, 141, 144, 145, and 148 that contact the methanol of the valve housing 130 are made of a resin having high methanol resistance, such as PPS (Polyphenylene sulfide) resin. The material of the edge 132 that does not contact the methanol of the housing 130 is made of metal. The valve housing 130 is formed by an insert mold in which an edge 132 of a metal part is inserted into a mold and is injection-molded.

As shown in FIGS. 4 and 6, the diaphragm 120 has a pusher 123 as a transmission mechanism at the center, and the peripheral portion 121 is formed in a disk shape that is thicker than the central portion 122. The material of the diaphragm 120 is a rubber having high methanol resistance, such as ethylene propylene rubber or silicone rubber. Diaphragm 120 constitutes valve chamber 140 together with valve casing 130 with peripheral edge 121 placed on valve casing 130. In the diaphragm 120, the central part 122 inside the peripheral part 121 is displaced by the pressure of the fluid in the valve chamber 140. When the central portion 122 of the diaphragm 120 is displaced in a direction approaching the valve portion 150, the pusher 123 presses the valve body portion 151.

When the liquid is used as the fluid for the stop valve 101, the liquid has a large surface tension, so that a larger fluid flow path is required than when the gas is used as the fluid for the stop valve 101. However, in the stop valve 101 of this embodiment, since the material of the diaphragm 120 is rubber, the movable range of the diaphragm 120 is larger than when the diaphragm 120 is formed of silicon or metal. Therefore, the stop valve 101 of this embodiment can secure a sufficient methanol flow path.

As shown in FIGS. 4 and 6, the valve portion 150 has a substantially circular shape and is made of a rubber having high methanol resistance, such as silicone rubber. The valve unit 150 contacts or separates from the valve seat 148 due to the displacement of the diaphragm 120, and a valve body unit 151 that blocks or releases the inflow of fluid (methanol) from the inflow hole 143 to the valve chamber 140. The support part 152 that supports the valve body part 151 movably in the direction in which the part 151 approaches and separates from the valve seat 148, the hole part 153 that allows methanol to pass through, and the valve part 150 are accommodated in the opening part 147. And a fixing portion 154 that contacts the inner peripheral surface of the opening 147 of the valve housing 130 and fixes the support portion 152.
In addition, in order to improve the sealing performance with the valve seat 148, the valve body portion 151 is formed with a ring-shaped valve protrusion 155 on the inflow hole 43 side, but the valve protrusion 155 is not necessarily formed.

In the valve body 151, the valve protrusion 155 of the valve body 151 comes into contact with the valve seat 148 when the valve 150 is housed in the opening 147, and the valve body 151 flows from the inlet hole 143 to the valve chamber 140. When the valve is closed, the valve seat 148 is pressurized in a direction to block the inflow of the valve. The valve body 151 is separated from the valve seat 148 when the diaphragm 120 is lowered and pushed down by the diaphragm 120, and the inflow hole 143 and the hole 153 communicate with each other to release the inflow of methanol into the valve chamber 140. Let

As shown in FIGS. 4, 5 (A) and 6, the cap part 110 has a substantially square plate shape, and is formed, for example, by molding using a stainless steel plate. The cap part 110 is formed with a screw hole 111 for fixing the cap part 110 and the valve casing 130 to the system casing 160. Here, the edge 116 of the metal cap portion 110 is joined to the metal edge 132 of the valve housing 130 by welding in a state where the diaphragm 120 is placed on the placement portion 134. When the peripheral part 114 of the cap part 110 is joined, the peripheral part 121 of the diaphragm 120 is pressed to hold the peripheral part 121 together with the mounting part 134.

In addition, a hole 115 communicating with outside air is formed in the central portion 113 of the cap portion 110. As a result, atmospheric pressure is applied to the upper part of the diaphragm 120.
A pressure receiving plate 125 made of a circular metal that receives a differential pressure between the atmospheric pressure and the internal pressure of the valve chamber 140 is joined to the diaphragm 120.

Similar to the above-described stop valve 90 (see FIG. 2), the stop valve 101 is configured to automatically open and close the valve unit 150 using the pressure difference when the fluid pressure reaches the set pressure. ing.

In the above configuration, the distance between the bottom surface 141 of the valve chamber 140 and the diaphragm 120 is narrowed, and the stop valve 101 is lowered. However, as shown in FIGS. 4, 6, and 7, the valve housing 130 of this embodiment includes an annular first protruding portion 144 with which the diaphragm 120 abuts when the valve portion 150 is opened. A first flow path 145 that allows methanol to pass from the inside to the outside of the protrusion 144 is formed around the inflow hole 143 on the bottom surface 141 of the valve chamber 140. In the first protrusion 144, the inner diameter of the valve chamber 140 is Dv, the diameter of the pressure receiving plate 125 is Db, and the outer diameter of the first protrusion 144 located at both ends of the inflow hole 143 is Dc. At this time, it is formed in a shape satisfying the relationship of Dc ≦ (Dv + Db) / 4.

Therefore, in the stop valve 101 in this embodiment, the rubber diaphragm 120 contacts the first protrusion 144 instead of the bottom surface 141 of the valve chamber 140 when the valve portion 150 is opened (see FIG. 7). Further, when the diaphragm 120 contacts the first protrusion 144, methanol passes from the inside of the first protrusion 144 to the outside of the first protrusion 144 via the first flow path 145.

Here, the shape of the first protrusion 144 that satisfies the relationship of Dc ≦ (Dv + Db) / 4 will be described in detail with reference to FIG. As shown in FIG. 7, the diaphragm 120 is pressed downward and is in contact with the first protrusion 144. The outer diameter Dc (4 mm in this embodiment) of the first protrusion 144 is less than half of the effective pressure receiving diameter Dp (10 mm in this embodiment). Here, the effective pressure receiving diameter corresponds to the diameter of the pressure acting on the entire surface of the diaphragm 120 excluding the pressure applied to the outer peripheral portion, that is, the diameter of the portion on which the pressure available for opening and closing the valve portion 150 acts. In the case of FIG. 7, it is substantially equal to the average value of the diameter Db of the pressure receiving plate 125 and the inner diameter Dv of the valve chamber 140. As for the force applied to the pressure receiving plate 125 at this time, the force applied to the outside of the first protruding portion 144 is larger than the force applied to the inside of the first protruding portion 144. Therefore, the pressure receiving plate 125 is as shown in FIG. It bends convexly toward the hole 115 side. However, since the diaphragm 120 is in contact with the first protrusion 144 and the diaphragm 120 is made of rubber, the diaphragm 120 may be fixed to the first protrusion 144. In particular, when the temperature of the fluid is high or when the contact between the diaphragm 120 and the first protrusion 144 continues for a long time, the possibility increases. However, in this embodiment, the pressure receiving plate 125 is bent convexly toward the hole 115 as described above, so that the diaphragm 120 is in contact with the first protrusion 144 obliquely. That is, since the diaphragm 120 and the first protrusion 144 are substantially in line contact, the diaphragm 120 and the first protrusion 144 are difficult to adhere. Even if the diaphragm 120 and the first protrusion 144 are fixed, if the pressure receiving plate 125 tries to return to the original flat state from the bent state, the adhesion is peeled off from the outside of the first protrusion 144. Therefore, the diaphragm 120 is easily peeled off from the first protrusion 144.

As described above, even when a highly active fluid such as methanol is used for the stop valve 101, the diaphragm 120 does not contact the bottom surface 141 of the valve chamber 140, and therefore the diaphragm 120 swollen by the fluid and the bottom surface of the valve chamber 140. 141 can be prevented from adhering.

Therefore, according to the stop valve 101 in this embodiment, it is possible to prevent the diaphragm 120 and the bottom surface 141 of the valve chamber 140 from sticking even with a low-profile structure. Therefore, the reliability of fluid control can be improved.

In the above configuration, the

parts

134, 141, 144, 145 and 148 in contact with methanol of the valve housing 130 are all made of resin, and the material of the diaphragm 120 and the valve part 150 is also rubber, so that metal ions It does not elute in methanol. Therefore, in the stop valve 101 of this embodiment, the DMFC characteristic does not deteriorate due to elution of metal ions.
Therefore, by using the stop valve 101 of this embodiment, the same effect can be obtained in the fuel cell system 100 including the stop valve 101.

<< Second Embodiment >>
FIG. 8 is a perspective view of the valve housing 230 provided in the stop valve 201 according to the second embodiment of the present invention. The difference between the stop valve 201 in this embodiment and the stop valve 101 is the first protrusion 244, and the other configuration is the same as that of the stop valve 101. The first projecting portion 244 is different from the first projecting portion 144 shown in FIG. 4 in that its tip is formed in a convex curved shape.

The first projecting portion 244 of this embodiment has a tip with a convex curved surface, so that the contact area with the diaphragm 120 when the valve portion 150 is opened is narrower than that with a flat tip. Therefore, the diaphragm 120 and the first protrusion 244 are difficult to adhere. Further, even if the diaphragm 120 and the first protrusion 244 are fixed, the diaphragm 120 is easily peeled off from the first protrusion 244. Further, when the diaphragm 120 contacts the first protrusion 244, methanol passes from the inside of the first protrusion 244 to the outside of the first protrusion 244 via the first flow path 245.

Therefore, according to the stop valve 201 in this embodiment, it is possible to prevent the diaphragm 120 and the first projecting portion 244 from sticking. Therefore, the reliability of fluid control can be further improved. Further, by using the stop valve 201 of this embodiment, the same effect can be obtained in a fuel cell system including the stop valve 201.

<< Third Embodiment >>
FIG. 9 is a perspective view of the valve housing 330 provided in the stop valve 301 according to the third embodiment of the present invention. The difference between the stop valve 301 in this embodiment and the stop valve 201 is the first protrusion 344, and the other configuration is the same as that of the stop valve 201. The first protrusion 344 is different from the first protrusion 244 shown in FIG. 8 in that it is an aggregate of a plurality of protrusions.

The first projecting portion 344 is an aggregate of a plurality of hemispherical protrusions whose tips are formed in a convex curved shape, so that the contact area with the diaphragm 120 when the valve portion 150 is opened is integral. Narrower than the first protrusion 244. Therefore, it is difficult for the diaphragm 120 and the first protrusion 344 to adhere to each other. Further, even if the diaphragm 120 and the first protrusion 344 are fixed, the diaphragm 120 is easily peeled off from the first protrusion 344. Further, when the diaphragm 120 comes into contact with the first protrusion 344, methanol passes from the inside of the first protrusion 344 to the outside of the first protrusion 344 via the first flow path 345.

Therefore, according to the stop valve 301 in this embodiment, it is possible to prevent the diaphragm 120 and the first projecting portion 344 from adhering to each other. Therefore, the reliability of fluid control can be further improved. Further, by using the stop valve 301 of this embodiment, the same effect can be obtained in a fuel cell system including the stop valve 301.

In this embodiment, the projections forming the first projecting portion 244 are formed in a hemispherical shape, but the projections may be cylindrical in implementation.

<< Fourth Embodiment >>
FIG. 10 is a perspective view of a valve housing 430 provided in a stop valve 401 according to the fourth embodiment of the present invention. The stop valve 401 in this embodiment is different from the stop valve 101 in the first protrusion 444, and the other configuration is the same as that of the stop valve 101. The first projecting portion 444 has a circular shape, and has a tip area larger than that of the first projecting portion 144 shown in FIG.

Also in the stop valve 401 of this embodiment, the diaphragm 120 contacts the first protruding portion 444 instead of the bottom surface 141 of the valve chamber 140 when the valve portion 150 is opened. Further, when the diaphragm 120 comes into contact with the first protrusion 444, the methanol flows from the inflow hole 143 inside the first protrusion 444 to the outside of the first protrusion 444 via the first flow path 445. pass.

Therefore, according to the stop valve 401 in this embodiment, the same effect as the stop valve 101 can be obtained. Further, by using the stop valve 401 of this embodiment, the same effect can be obtained in a fuel cell system including the stop valve 401.

<< Fifth Embodiment >>
FIG. 11 is a perspective view of a valve housing 530 provided in a stop valve 501 according to the fifth embodiment of the present invention. 12 is a cross-sectional view of a principal part taken along line SS in FIG. The stop valve 501 in this embodiment is different from the stop valve 301 shown in FIG. 9 in that a second protrusion 564 is provided, and other configurations are the same as those of the stop valve 301. .

More specifically, the valve housing 530 in this embodiment includes a second protrusion 564 having a height lower than that of the first protrusion 344, and a hole 143 inside the second protrusion 564. A second flow path 565 that passes outside is formed on the bottom surface 141 of the valve chamber 140 inside the first protrusion 344 and around the inflow hole 143.

In this embodiment, the adhesion between the diaphragm 120 and the bottom surface 141 of the valve chamber 140 is prevented by the first protrusion 344 as in the case of the stop valve 301. On the other hand, the first protruding portion 344 also has a function of determining the bottom dead center of the diaphragm 120 when the valve portion 150 is opened. However, as shown in FIG. 9, when the first protrusion 344 has a curved surface shape, when the valve 150 is opened, when the acting pressure is very high, in some cases, the diaphragm 120 may be connected to the first protrusion 344. It may come into contact and undergo local compression deformation, and a part of the first protrusion 344 may bite into the diaphragm 120. In this case, the first flow path 345 is narrowed by the deformed diaphragm 120, and the diaphragm 120 may obstruct the flow of methanol.

Therefore, in the stop valve 501 of this embodiment, the second protrusion 564 having a flat tip is formed on the inner side of the first protrusion 344 lower than the first protrusion 344. Accordingly, even when the diaphragm 120 comes into contact with the first protruding portion 344 when the valve portion 150 is opened and a part of the first protruding portion 344 bites into the diaphragm 120, the second protruding portion 564 causes the second flow. Since the channel 565 is secured, a sufficient methanol channel can be secured. That is, the stop valve 501 of this embodiment has a structure having a first protrusion 344 for preventing sticking and a second protrusion 564 for securing a flow path.

As described above, according to the stop valve 501 of this embodiment, since the first protrusion 344 is provided, it is possible to prevent the diaphragm 120 and the bottom surface 141 of the valve chamber 140 from sticking to each other. Further, even when the diaphragm 120 comes into contact with the first protrusion 344 and the first protrusion 344 bites into the diaphragm 120 when the valve portion 150 is opened, the second protrusion 564 can sufficiently Two flow paths 565 can be secured. For this reason, it can prevent obstructing the flow of methanol. Further, by using the stop valve 501 of this embodiment, the same effect can be obtained in the fuel cell system including the stop valve 501.

<< Sixth Embodiment >>
FIG. 13: is principal part sectional drawing of the valve housing | casing 630 with which the stop valve 601 which concerns on the 6th Embodiment of this invention is equipped. The stop valve 601 in this embodiment is different from the stop valve 301 shown in FIG. 9 in that a third protrusion 674 is provided, and other configurations are the same as those of the stop valve 301. .

Specifically, the valve housing 630 has a third protrusion 674 formed on the periphery of the inflow hole 143 on the bottom surface 141 of the valve chamber 140, and the first protrusion 344 faces the diaphragm 120. It is formed on the upper surface of the third protrusion 674.

Here, as described above, the valve seat 148 is pressurized when the valve is closed by the valve body 151 in a direction to block the inflow of fluid from the inflow hole 143 to the valve chamber 140. Therefore, the peripheral portion of the inflow hole 143 in the valve housing 630 needs to have high rigidity, and it is desirable to make the thickness as thick as possible. On the other hand, in order to reduce the height of the stop valve 601, it is desirable to make the thickness of the valve housing 630 as thin as possible.

Therefore, in this embodiment, the thickness of the peripheral portion of the inflow hole 143 in the valve housing 630 is increased by providing the third protrusion 674. Thereby, the rigidity of the peripheral part of the inflow hole 143 in the valve housing 630 can be increased. Further, by increasing the thickness of the peripheral portion of the inflow hole 143 in the valve housing 630, the flow of resin at the time of injection molding is improved, so that the occurrence of molding defects and the like can be reduced. That is, since the yield is improved, the manufacturing cost can be reduced.

Therefore, according to the stop valve 601 in this embodiment, the rigidity of the peripheral portion of the inflow hole 143 in the valve housing 630 can be increased, and the manufacturing cost can be reduced. Further, by using the stop valve 601 of this embodiment, the same effect can be obtained in a fuel cell system including the stop valve 601.

In the stop valve 601 of this embodiment as well, the diaphragm 120 contacts the first protrusion 344 instead of the bottom surface 141 of the valve chamber 140 when the valve unit 150 is opened. Further, when the diaphragm 120 comes into contact with the first protrusion 344, methanol passes from the inside of the first protrusion 344 to the outside of the first protrusion 344 via the first flow path 345. Therefore, according to the stop valve 601 in this embodiment, the same effect as the stop valve 301 can be obtained.

<< Seventh Embodiment >>
FIG. 14 is a perspective view of a valve housing 730 provided in a stop valve 701 according to the seventh embodiment of the present invention. FIG. 15 is a cross-sectional view of a main part taken along line TT in FIG. The main point of difference between the stop valve 701 in this embodiment and the stop valve 501 shown in FIG. 9 is that it includes a third protrusion 774, and the rest of the configuration is the same as that of the stop valve 501. It is.

More specifically, the valve housing 730 has a third protrusion 774 and a third flow path 775 formed on the periphery of the inflow hole 143 on the bottom surface 141 of the valve chamber 140, and the first protrusion 744. The second protrusion 764 is formed on the upper surface of the third protrusion 774 facing the diaphragm 120. Here, the first protruding portion 744 is a protruding portion for preventing sticking similarly to the first protruding portion 344 shown in FIG. 11, and the protrusions constituting the first protruding portion 744 are the first protruding portions 344. It is the same as the protrusion which comprises. The first flow path 745 allows methanol to pass from the inner side to the outer side of the first projecting portion 744 in the same manner as the first flow path 345. In addition, the second protrusion 764 is a protrusion for securing a flow path similarly to the second protrusion 564 shown in FIG. 11, and the second flow path 775 contains methanol similarly to the second flow path 565. The second protrusion 564 is passed through the hole 143 inside the second protrusion 564. Further, the third projecting portion 774 is a projecting portion for improving rigidity, like the third projecting portion 674 shown in FIG. That is, the stop valve 701 of this embodiment has a structure having a first protrusion 744 for preventing sticking, a second protrusion 764 for securing a flow path, and a third protrusion 774 for improving rigidity. Yes.

Therefore, according to the stop valve 701 in this embodiment, the same effects as those of the stop valve 501 and the stop valve 601 can be obtained. Furthermore, in the stop valve 701 of this embodiment, since the third flow path 775 is provided between the second flow path 765 and the outflow hole 149, the methanol that has flowed from the inflow hole 143 flows into the second flow path. It flows straight from the path 765 to the outflow hole 149 via the third flow path 775. Therefore, according to the stop valve 701 in this embodiment, the methanol flow path can be secured from the stop valve 601 when the valve portion 150 is opened.
Further, by using the stop valve 701 of this embodiment, the same effect can be obtained in a fuel cell system including the stop valve 701.

<< Other Embodiments >>
In the above embodiment, methanol is used as a highly active fluid, but the fluid may be any of gas, liquid, gas-liquid mixed flow, solid-liquid mixed flow, solid-gas mixed flow, and the like.

It should be noted that the above description of the embodiment is an example in all respects and is not restrictive. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.

DESCRIPTION OF SYMBOLS 1 Diaphragm 2 Piston 3 Valve seat part 4 Valve body part 5 Support part 7 Valve housing 8 Valve chamber 9 Bottom face 10 Cap part 15 Hole part 20 Diaphragm 23 Pusher 30 Valve housing 40 Valve chamber 43 Inflow hole 48 Valve seat 49 Outlet hole DESCRIPTION OF SYMBOLS 50 Valve part 51 Valve body part 55 Valve protrusion 90 Stop valve 100

Fuel cell system

101, 201, 301, 401, 501, 601, 701 Stop valve 102 Fuel cartridge 103 Pump 104 Power generation cell 110 Cap part 111 Hole 113 Central part 114 Peripheral part 115 Hole part 116 Edge 120 Diaphragm 121 Peripheral part 122 Central part 123 Pusher 125

Pressure receiving plate

130, 230, 330, 430, 530, 630, 730 Valve housing 131 Hole 132 Edge 134 Placed 140 Valve chamber 141 Bottom surface 143

Inflow hole

144, 244, 344, 444, 744

First protrusion

145, 245, 345, 445, 745

First flow path

564, 764

Second protrusion

565, 765

Second Flow path

674, 774 Third protrusion 775 Third flow path 147 Opening 148 Valve seat 149 Outflow hole 150 Valve part 151 Valve body part 152 Supporting part 153 Hole part 154 Fixing part 155 Valve protrusion 160 System housing 161, 162 O-ring 163 Inflow path 165 Outflow path

Claims

A valve housing;
Comprising a valve chamber together with the valve housing, and a diaphragm displaced by the pressure of fluid in the valve chamber;
The valve housing has an inflow hole through which fluid flows into the valve chamber, and an outflow hole through which fluid flows out of the valve chamber due to the suction pressure of the fluid by the pump. A stop valve,
A valve body disposed in the inflow hole and configured to block or open the inflow of fluid from the inflow hole to the valve chamber by displacement of the diaphragm;
The valve housing has a first protrusion with which the diaphragm comes into contact when the valve body releases the inflow of fluid from the inflow hole to the valve chamber, and the fluid is supplied to the first protrusion. A stop valve in which a first flow path that passes from the inside to the outside of the part is formed around the inflow hole on the bottom surface of the valve chamber facing the diaphragm.
A pressure receiving plate that receives a differential pressure between the atmospheric pressure and the internal pressure of the valve chamber is joined to the diaphragm,
The first protrusion is Dc, where Dv is the inner diameter of the valve chamber, Db is the diameter of the pressure receiving plate, and Dc is the outer diameter of the first protrusion located at both ends of the inflow hole. The stop valve according to claim 1, wherein the stop valve is formed in a shape satisfying a relationship of ≦ (Dv + Db) / 4.
The stop valve according to claim 1 or 2, wherein the first protrusion has a curved surface with a convex tip.
The stop valve according to any one of claims 1 to 3, wherein the first protrusion is an assembly of a plurality of protrusions.
The valve housing includes a second protrusion having a height lower than that of the first protrusion, and a second flow path for allowing fluid to pass from the inside to the outside of the second protrusion. The stop valve according to any one of claims 1 to 4, wherein the stop valve is formed on the bottom surface of the chamber inside the first protrusion and around the inflow hole.
In the valve housing, a third protrusion is formed on the periphery of the inflow hole on the bottom surface of the valve chamber,
6. The stop valve according to claim 1, wherein the first protrusion is formed on an upper surface of the third protrusion that faces the diaphragm. 7.
The stop valve according to any one of claims 1 to 6, wherein the fluid is methanol.
The stop valve according to any one of claims 1 to 7, wherein a material of the diaphragm is rubber, and a material of a portion of the valve housing that is in contact with the fluid is resin.
A stop valve according to any one of claims 1 to 8,
A fuel reservoir connected to the inflow hole of the stop valve;
And a pump connected to the outflow hole of the stop valve.