JP5193174B2 - Fluid discharge valve - Google Patents

Description

  The present invention relates to a fluid discharge valve.

  2. Description of the Related Art There is known a fuel cell vehicle equipped with a fuel cell that generates power by supplying a fuel gas (for example, hydrogen) on the anode side and an oxidant gas (for example, oxygen or air) on the cathode side. In the fuel cell configured as described above, unreacted fuel gas is contained in the fuel gas discharged from the fuel cell after being used for power generation, that is, the anode off-gas. If this is released as it is, the fuel efficiency will deteriorate. To solve this problem, a fuel cell system that circulates anode off gas using an ejector, pump, etc., mixes it with fresh fuel gas, and supplies it to the fuel cell again. Are known.

  By the way, in a solid polymer electrolyte membrane type fuel cell, when the fuel cell generates power, water vapor (water) is generated on the cathode side, and a part of the water permeates to the anode side through the electrolyte membrane. Further, in order to maintain the wet state of the electrolyte membrane, the fuel gas and the oxidant gas toward the fuel cell are humidified by a humidifier or the like. Therefore, the anode off gas becomes humid.

When water accumulates on the anode side of the fuel cell in this way, the supply of fuel gas is hindered and power generation may become unstable. In addition, since nitrogen contained in the air supplied to the cathode side permeates to the anode side through the electrolyte membrane though a minute amount, it mixes with the fuel gas, so that the concentration of nitrogen may increase due to the circulation use of the fuel gas. As a result, power generation may become unstable.

  When the power generation of the fuel cell becomes unstable, fluid is discharged from the fuel gas circulation passage, and water mixed on the anode side and nitrogen mixed in the fuel gas are discharged to recover the power generation state. For this purpose, a fluid discharge valve is provided in the fuel gas circulation passage.

  However, in solid polymer electrolyte membrane type fuel cells, if the fuel cell system is stopped in a sub-freezing environment, the water adhering between the valve body of the fluid discharge valve and the seat is frozen and stuck. Then, there is a problem that the fluid discharge valve cannot be opened and the fluid cannot be discharged.

  Therefore, a fluid discharge valve has been proposed that has a structure in which sticking due to fluid freezing hardly occurs even at low temperatures (see, for example, Patent Documents 1 and 2).

JP 2004-162878 A JP 2006-153177 A

  However, although the fluid discharge valves of Patent Documents 1 and 2 have a structure in which sticking due to freezing of the fluid is less likely to occur than in the conventional discharge valves, water still remains at the stagnation point of the fluid flow. May remain. In this way, in the actual fuel cell system, when stopping the power generation of the fuel cell, the air pump is activated and the fluid flows with air. Since control (scavenging control) is performed to blow off the water remaining in the discharge valve, there is a risk of deteriorating NV performance.

  Therefore, the present invention has been made in view of the above circumstances, and provides a fluid discharge valve that can prevent the valve body from sticking in a low temperature environment.

In order to solve the above problems, the invention described in claim 1 is directed to a primary chamber body (for example, the primary chamber in the embodiment) in which a primary chamber into which a fluid is introduced (for example, the primary chamber 110a in the embodiment) is formed. Body 110), a secondary chamber body (for example, secondary chamber body 120 in the embodiment) in which a secondary chamber (for example, secondary chamber 120a in the embodiment) from which the fluid is led out is formed, and the primary chamber An introduction path (for example, the introduction path 111 in the embodiment), a lead-out path (for example, the lead-out path 121 in the embodiment) for deriving the fluid from the secondary chamber, the primary chamber, and the two A valve body (for example, the valve body 130 in the embodiment) that communicates with or cuts off from the next chamber and is driven by a drive mechanism (for example, the solenoid 150 in the embodiment) In the fluid discharge valve (for example, the purge valve 50 in the embodiment), the valve body is at a position corresponding to the central axis of the primary chamber and the secondary chamber (for example, the central axis of the shaft 140 in the embodiment). The primary chamber and the secondary chamber are arranged in the vertical direction, and the wall surfaces of the primary chamber and the secondary chamber (for example, the wall surfaces 110b and 120b in the embodiment) are centered on the central axis. Formed in a circular shape, and the introduction path has an upward inclined shape, and moisture contained in the fluid introduced into the primary chamber flows into the introduction path and can be discharged . The introduction path and the lead-out path are both offset by a predetermined amount in the radial direction of the valve body from a line segment passing through the central axis of the valve body, and the inner surface of the lead-out path and the secondary chamber Of the corners formed in contact and a wall, a corner portion on the downstream side as viewed from the fluid derived from the secondary chamber is characterized by the outlet passage is arranged Tei Rukoto such an acute angle.

According to the first aspect of the invention, the swirling flow is generated in the primary chamber and the secondary chamber by offsetting the introduction path and the lead-out path from the radial direction orthogonal to the central axis. Therefore, the fluid supplied to the primary chamber and the secondary chamber is discharged from the outlet path so as to be pushed out by the swirling flow. That is, it is possible to more reliably prevent the valve body from sticking in a low temperature environment.
Further, it is possible to prevent the valve body from sticking by a simple method of shifting the arrangement positions of the introduction path and the lead-out path .

Further , the fluid supplied to the primary chamber can be smoothly supplied to the secondary chamber while swirling in the chamber. Therefore, the fluid can be smoothly discharged from the outlet path.

Furthermore , the fluid supplied to the primary chamber and the secondary chamber can generate a swirl flow along the wall surface, and the fluid can be discharged from the outlet channel more smoothly.

And the fluid supplied to the primary chamber and the secondary chamber can generate a swirl flow along the wall surface, and since the outlet path is arranged along the flow direction, the fluid is more reliably And it can be smoothly discharged from the outlet path.

1 is a schematic configuration diagram of a fuel cell system in an embodiment of the present invention. It is sectional drawing of the purge valve in embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is a schematic plan view which shows another aspect (1) of the arrangement configuration of the introduction path and the outlet path of the purge valve in the embodiment of the present invention. It is a schematic plan view which shows another aspect (2) of the arrangement configuration of the introduction path of the purge valve and the outlet path in the embodiment of the present invention .

  Next, an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a fluid discharge valve (purge valve) attached to piping of a fuel cell system in a fuel cell vehicle will be described.

(Fuel cell system)
FIG. 1 is a schematic configuration diagram of a fuel cell system.
As shown in FIG. 1, the fuel cell 11 of the fuel cell system 10 is a solid polymer membrane fuel cell that generates electric power by an electrochemical reaction between an anode gas such as hydrogen gas and a cathode gas such as air. An anode gas supply pipe 23 is connected to the anode gas supply communication hole 13 (inlet side of the anode gas passage 21) formed in the fuel cell 11, and a hydrogen tank 30 is connected to the upstream end thereof. A cathode gas supply pipe 24 is connected to the cathode gas supply communication hole 15 (inlet side of the cathode gas flow path 22) formed in the fuel cell 11, and an air compressor 33 is connected to the upstream end thereof. Yes. An anode off-gas exhaust pipe 35 (cathode gas flow path 22) is connected to the anode off-gas discharge communication hole 14 (exit side of the anode gas flow path 21) formed in the fuel cell 11. Is connected to a cathode offgas discharge pipe 38.

  Further, the hydrogen gas supplied from the hydrogen tank 30 to the anode gas supply pipe 23 is decompressed by a regulator (not shown), then passes through the ejector 26 and is supplied to the anode gas flow path 21 of the fuel cell 11. An electromagnetically driven solenoid valve 25 is provided in the vicinity of the downstream side of the hydrogen tank 30 so that the supply of hydrogen gas from the hydrogen tank 30 can be shut off.

  The anode off gas discharge pipe 35 is connected to the ejector 26 so that the anode off gas discharged through the fuel cell 11 can be reused as the anode gas of the fuel cell 11 again. Further, the anode off-gas discharge pipe 35 is provided with two pipes branched in the middle, one being a drain discharge pipe 36 and the other being a purge gas discharge pipe 37. The drain discharge pipe 36 and the purge gas discharge pipe 37 are both connected to the dilution box 31 downstream thereof. The drain discharge pipe 36 is provided with an electromagnetically driven drain valve 51, and the purge gas discharge pipe 37 is provided with an electromagnetically driven purge valve 50. A catch tank 53 is provided as a gas-liquid separator at a branch point between the anode off-gas discharge pipe 35 and the drain discharge pipe 36.

  Air (cathode gas) is pressurized by the air compressor 33, passes through the cathode gas supply pipe 24, and is then supplied to the cathode gas flow path 22 of the fuel cell 11. After this oxygen in the air is used as an oxidizing agent for power generation, it is discharged from the fuel cell 11 to the cathode offgas discharge pipe 38 as cathode offgas. The cathode offgas discharge pipe 38 is connected to the dilution box 31 and then exhausted to the outside of the vehicle. A back pressure valve 34 is provided in the cathode off gas discharge pipe 38. In addition, a humidifier 39 is provided between the cathode gas supply pipe 24 and the cathode offgas discharge pipe 38. The humidifier 39 humidifies the cathode gas by the movement of moisture contained in the cathode off gas.

  Further, in the cathode gas supply pipe 24 connecting the air compressor 33 and the fuel cell 11, the pipe is branched and one end of the scavenging gas introduction pipe 54 is connected. The other end of the scavenging gas introduction pipe 54 is connected between the ejector 26 and the fuel cell 11 in the anode gas supply pipe 23. That is, the air pressurized by the air compressor 33 can be supplied to the anode gas passage 21 of the fuel cell 11. The scavenging gas introduction pipe 54 is provided with an electromagnetically driven solenoid valve 55 so that the supply of air from the air compressor 33 can be shut off.

(Purge valve)
Next, the configuration of the purge valve 50 will be described.
The purge valve 50 is a normally-closed solenoid valve, and discharges (purges) impurities (water vapor, nitrogen, etc.) contained in the anode offgas (hydrogen) circulating through the anode offgas discharge pipe 35 during power generation of the fuel cell 11. In this case, the valve is opened by an instruction from the ECU 45. The upstream side of the purge valve 50 is connected to the anode off gas discharge pipe 35 via the upstream purge gas discharge pipe 37a, and the downstream side is connected to the dilution box 31 via the downstream purge gas discharge pipe 37b.

  In the present embodiment, an upstream side purge gas discharge pipe 37 a connected to an introduction path 111, which will be described later, of the purge valve 50 is provided in an upwardly inclined manner toward the introduction path 111. A downstream purge gas discharge pipe 37 b connected to a lead-out path 121 of the purge valve 50 described later is provided so as to be horizontal or downwardly inclined toward the dilution box 31.

  For example, when the voltage (cell voltage) of a single cell constituting the fuel cell 11 is equal to or lower than a predetermined cell voltage, the ECU 45 determines that the impurities need to be discharged and sets the purge valve 50 to open. Has been. The cell voltage is detected, for example, via a voltage sensor (cell voltage monitor) that detects the voltage of a single cell, and is input to the ECU 45.

  As shown in FIG. 2, the purge valve 50 is provided adjacent to a primary chamber body 110 in which a primary chamber 110a into which an anode off gas is introduced is formed, and a lower portion of the primary chamber body 110, and the anode off gas is led out. A secondary chamber body 120 in which a secondary chamber 120a is formed, and a valve body 130 is provided by a solenoid 150 as a drive mechanism disposed on the lower side of the secondary chamber body 120 (secondary chamber 120a). By being driven, the communication state between the primary chamber 110a and the secondary chamber 120a is switched.

  That is, the purge valve 50 is opened when purging, and functions as a valve for discharging the anode off gas sent from the anode off gas discharge pipe 35 to the dilution box 31 as shown in FIG. It is like that. In the present embodiment, the primary chamber 110a on the side into which the anode off gas is introduced is disposed on the upper side, the secondary chamber 120a on the side from which the anode off gas is led out is disposed on the lower side, and the valve body 130 is further provided. Is configured to be disposed below the secondary chamber 120a.

  An introduction path 111 for introducing the anode off gas into the primary chamber 110 a is connected (opened) to the bottom wall 112 of the primary chamber body 110. The introduction path 111 is provided with an orifice 113, and the orifice 113 is positioned below the bottom wall 112.

Hereinafter, each part will be described in detail.
An inlet path 111 for introducing an anode off gas to the bottom wall 112 is connected to the primary chamber body 110. In this example, the introduction path 111 has an upward inclined shape, and its upper end is connected to the bottom wall 112 and is open so as to be able to communicate therewith. That is, the introduction path 111 is provided at a lower position below the bottom wall 112, so that when moisture is mixed in the anode off gas, the moisture is accumulated in the primary chamber 110 a. However, the moisture flows into the introduction path 111 through the opening 111a of the introduction path 111 and is discharged to the catch tank 53 on the upstream side by its own weight.

  The introduction path 111 is provided with an orifice 113, and the orifice 113 serves to limit the flow rate of the anode off gas flowing from the introduction path 111 toward the primary chamber 110a. In other words, the orifice 113 serves to reduce the pressure of the anode off gas introduced into the primary chamber 110a, and reduces the load applied to the diaphragm 160 disposed in the secondary chamber 120a. Thereby, the deformation | transformation beyond the tolerance | permissible_range of the diaphragm 160 can be prevented, and durability of the diaphragm 160 can be improved.

  A valve body 130 is disposed in the primary chamber 110a so as to be displaceable in the vertical direction (valve opening / closing direction), and a valve seat 116 is provided on the bottom surface side of the valve body 130.

  The valve body 130 is configured to open by being displaced toward the upper wall 114 of the primary chamber body 110 that forms the primary chamber 110 a, and the surface that forms the top of the valve body 130 is in relation to the upper wall 114. Inclined. That is, the top of the valve body 130 is pointed without a flat surface. In the present embodiment, the valve body 130 has a tapered section 130a having a mountain-shaped cross section that gradually decreases in diameter toward the upper wall 114 side. It is formed including.

  In addition, you may give a fluorine coating to the surface of the taper-shaped part 130a. Since the fluorine coating has a water repellent effect of repelling moisture, it becomes difficult for moisture to stay at the top or upper portion of the valve body 130, and drainage can be improved.

  The valve seat 116 is provided integrally with a partition wall 115 that partitions the primary chamber 110a and the secondary chamber 120a, and protrudes from the partition wall 115 (the bottom of the primary chamber body 110) toward the upper wall 114. Has been. The valve seat 116 has a substantially cylindrical shape, and is formed so as to be reduced in a taper shape toward the upper end portion. An annular valve seat portion 117 on which the valve body 130 is seated is formed at the distal end portion of the valve seat 116. The valve seat 117 is formed flat so as to be in close contact with the flat bottom surface 132 formed on the valve body 130. Further, the valve seat portion 117 may be formed in an R shape, for example, in order to improve adhesion.

  A recess 114 a is formed in the upper wall 114 of the primary chamber 110 a, and an upper end of a return spring 135 that biases the valve body 130 toward the valve seat portion 117 is held in the recess 114 a. The return spring 135 is contracted between the valve body 130 and the recess 114a, and the bottom surface 132 of the flange portion 134 of the valve body 130 is airtight to the valve seat portion 117 when the valve body 130 is closed. Energized to sit well. By such an urging of the return spring 135, the primary chamber 110a and the secondary chamber 120a are blocked from being able to communicate with each other.

  A predetermined clearance is formed between the recess 114a and the valve body 130 when the valve body 130 is driven and displaced upward. Further, the side portion of the primary chamber 110 a is closed by the closing member 118.

  The secondary chamber 120 a is connected to the lower portion of the primary chamber 110 a via a partition wall 115, and a lead-out path 121 that can be connected to the downstream purge gas discharge pipe 37 b leading to the dilution box 31 is formed. That is, when the valve body 130 is driven to open, and when the anode off gas flows from the primary chamber 110a into the secondary chamber 120a via the valve body 130, the anode off gas that has flowed into the secondary chamber 120a flows downstream from the outlet passage 121. The gas is sent to the dilution box 31 through the side purge gas discharge pipe 37b. In the present embodiment, the lead-out path 121 is formed on the side opposite to the introduction path 111 in a plan view, that is, the side on which the downstream purge gas discharge pipe 37b leading to the dilution box 31 can be connected.

  In addition, a sealing member (not shown) is interposed at a connection portion between the introduction path 111 and the upstream side purge gas discharge pipe 37a and a connection portion between the lead-out path 121 and the downstream side purge gas discharge pipe 37b. Off-gas tightness is maintained.

  Further, a water-repellent coating such as a fluorine coating may be applied to the inside of the primary chamber 110a and the secondary chamber 120a. Fluorine coating makes it difficult for moisture to stay inside the primary chamber 110a and the secondary chamber 120a, and can improve drainage.

  In particular, in the primary chamber 110a, moisture such as water droplets remaining in the primary chamber 110a is returned from the bottom wall 112 of the primary chamber body 110 to the introduction path 111, and it is difficult for moisture to remain in the primary chamber 110a. .

  Furthermore, as shown in FIG. 3, in this embodiment, the primary chamber 110a has a wall surface 110b having a circular shape in plan view with the valve body 130 (the upper end 140b of the shaft 140) as the central axis. The introduction path 111 is provided at a position offset from the radial direction perpendicular to the central axis. That is, the anode off gas supplied from the introduction path 111 does not go straight toward the central axis in the primary chamber 110a, but a swirl flow is generated in the primary chamber 110a.

  As shown in FIG. 4, the secondary chamber 120 a also has a circular wall surface 120 b in plan view with the valve body 130 as the central axis. The lead-out path 121 is provided at a position offset from the radial direction orthogonal to the central axis of the valve body 130 (shaft 140). That is, the anode off gas supplied to the secondary chamber 120a through the gap of the valve body 130 opened from the primary chamber 110a flows along the wall surface 120b of the secondary chamber 120a, and swirls in the secondary chamber 120a. Is configured to occur. Furthermore, since the outlet path 121 is disposed in the direction along the flow, the anode off-gas can be discharged smoothly and reliably from the secondary chamber 120a to the outlet path 121.

  Returning to FIG. 2, a shaft 140 driven by a solenoid 150 and having a tip fixed to the mounting hole 133 of the valve body 130 passes through the secondary chamber 120 a, and the secondary chamber 120 a is interposed between the secondary chamber 120 a and the shaft 140. Is provided with a diaphragm 160 made of an elastic member (for example, a material such as rubber) which is locked to the shaft 140 and bends following the displacement operation of the shaft 140.

  The diaphragm 160 is an annular member surrounding the periphery of the shaft 140, and has an inner peripheral edge 161 attached to the flange portion 141 of the shaft 140, and a thin-walled shape extending radially outward from the inner peripheral edge 161. It has a skirt part 162 (curved convex part) and an outer peripheral edge part 163 formed on the outer peripheral part of the skirt part 162.

  The inner peripheral edge portion 161 is locked to the shaft 140 by being sandwiched between the flange portion 141 and a bottomed cylindrical pressing member 142 attached to the shaft 140.

  The skirt portion 162 is configured to bendable following the displacement operation of the shaft 140.

  Further, the outer peripheral edge 163 is sandwiched between the bottom wall 122 of the secondary chamber 120a and the fixed core 151 of the solenoid 150.

  By providing such a diaphragm 160, the space between the secondary chamber 120a and the shaft 140 is sealed, and the airtightness inside the secondary chamber 120a is suitably maintained.

  The solenoid 150 is disposed inside the casing 154 and has a bobbin 155 around which the coil 155a is wound, a fixed core 151 disposed so as to close the upper end portion of the casing 154, and an excitation action of the coil 155a. A cylindrical movable core 156 that is displaced in the axial direction of 140 and a cap portion 157 that covers an opening provided at a lower end portion of the casing 154 are provided.

  The movable core 156 is a cylindrical member made of a magnetic metal material, and is disposed so as to be able to be inserted along the inner wall surface of the bobbin 155. The movable core 156 is movable in the axial direction of the shaft 140 by the exciting action of the coil 155a. That is, the movable core 156 is attracted to the fixed core 151 when the coil 155a is excited, and moves upward against the urging force of the return spring 135. Thereby, the valve body 130 is pushed upward.

  A through hole 156a is formed along the axial direction in a substantially central portion of the movable core 156 in plan view, and the lower end 140a of the shaft 140 is inserted into and fixed to the through hole 156a.

  The shaft 140 has a lower end 140 a side fitted and fixed in a hollow portion of the movable core 156, and an upper end 140 b side inserted and fixed in an attachment hole 133 that opens at a lower portion of the valve body 130. A flange portion 141 for fixing the inner peripheral edge portion 161 of the diaphragm 160 to the pressing member 142 is formed at a substantially central portion in the axial direction of the shaft 140.

  Note that a fluorine coating or the like may be applied to the outer peripheral surface of the shaft 140 so that the sliding resistance when the shaft 140 is displaced is reduced. By doing in this way, abrasion of the shaft 140 can be reduced and durability can be improved. Moreover, it is possible to suppress the generation of wear powder when the shaft 140 is displaced. By applying the fluorine coating, it is possible to suppress moisture from adhering to the outer peripheral surface of the shaft 140 and to prevent the shaft 140 from being rusted. Therefore, the durability of the shaft 140 can be improved.

  The cap portion 157 is attached so as to cover the through-hole 158 communicating with the movable core 156, and a moisture-permeable waterproof material 157a capable of preventing the entry and exit of water while allowing the entry and exit of air is mounted inside. The moisture permeable waterproof material 157a is made of, for example, Gore-Tex (registered trademark). If such a moisture-permeable waterproof material 157a is arranged, it is possible to prevent water and dust from entering the solenoid 150.

Next, the operation of the purge valve 50 will be described.
When the voltage (cell voltage) of the single cell constituting the fuel cell 11 becomes equal to or lower than the predetermined cell voltage, the ECU 45 determines that it is necessary to discharge impurities, and the purge valve 50 is opened by a command from the ECU 45.

  When the purge valve 50 is opened, the anode off-gas that is led out from the anode gas passage 21 and contains impurities passes through the anode off-gas discharge pipe 35, the catch tank 53, the upstream-side purge gas discharge pipe 37 a, and the introduction path 111 to form the primary purge valve 50. It is introduced into the chamber 110a. At this time, the anode off-gas introduced into the introduction passage 111 is reduced in pressure by being reduced to a predetermined flow rate by the orifice 113, and then generates a swirling flow around the central axis in the primary chamber 110a. It flows into the secondary chamber 120a through between 130 and the valve seat 117. The anode off-gas flowing into the secondary chamber 120a is led out from the secondary chamber 120a to the lead-out path 121 while generating a swirling flow along the wall surface 120b in the secondary chamber 120a. The anode off gas led out from the lead-out path 121 is sent to the dilution box 31 through the downstream purge gas discharge pipe 37b.

  Further, when the energization of the solenoid 150 to the coil 155a is turned off by the ESU 45 at the end of the purge, the coil 155a is de-energized and the movable core 156 is displaced downward along the axial direction. At substantially the same time, the valve body 130 is pressed downward by the urging force of the return spring 135, and the valve body 130 is seated on the valve seat portion 117 by the urging force of the return spring 135. Thereby, the communication between the primary chamber 110a and the secondary chamber 120a is blocked, and the communication between the introduction path 111 and the outlet path 121 is blocked.

According to the present embodiment, the introduction path 111 and the lead-out path 121 are provided by being offset from the radial direction orthogonal to the central axis of the valve body 130 (shaft 140), so that the swirl flows in the primary chamber 110a and the secondary chamber 120a. Will occur. Therefore, the fluid (anode off gas) supplied to the primary chamber 110a and the secondary chamber 120a is discharged from the outlet passage 121 so as to be pushed out by the swirling flow. That is, it is possible to prevent water from remaining in the secondary chamber 120a under a low temperature environment, and it is possible to reliably prevent the valve body 130 from adhering.
Further, the valve body 130 can be prevented from being fixed by a simple method of shifting the arrangement positions of the introduction path 111 and the lead-out path 121.

  In addition, since the primary chamber 110a is disposed on the upper side and the secondary chamber 120a is disposed on the lower side, the anode off gas supplied to the primary chamber 110a smoothly moves along the direction of gravity to the secondary chamber 120a while swirling in the primary chamber 110a. Supplied with. Therefore, the anode off gas can be smoothly discharged from the outlet path 121.

  Furthermore, since the wall surface 110b of the primary chamber 110a and the wall surface 120b of the secondary chamber 120a are formed to be circular around the central axis of the valve body 130 (shaft 140), they are supplied to the primary chamber 110a and the secondary chamber 120a. The anode off gas can easily generate a swirl flow along the wall surfaces 110b and 120b, and the anode off gas can be discharged from the outlet passage 121 more smoothly without leaving water in the secondary chamber 120a.

  The introduction path 111 and the outlet path 121 are both arranged so as to be offset from the radial direction orthogonal to the central axis of the valve body 130 (shaft 140), and the outlet path 121 is arranged in a direction along the flow direction of the anode off gas. As a result, the anode off-gas can be discharged from the outlet passage 121 more reliably and smoothly. That is, it is possible to prevent the anode off-gas water from remaining in the secondary chamber 120a, and it is possible to prevent the valve element 130 from sticking in a low temperature environment.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific structure and shape described in the embodiment are merely examples, and can be changed as appropriate.
For example, in the present embodiment, the guide Detchi has been described in the case of providing such that the downward inclined, need not always be inclined, it may be provided in the horizontal direction optical Detchi.
The arrangement of the introduction path and outlet path is not limited to the configuration of the present embodiment may be arranged as shown in FIGS. 5-6.
Furthermore, in this embodiment, the case of the purge valve used in the fuel cell system has been described. However, the purge valve may be employed in other applications.

  DESCRIPTION OF SYMBOLS 50 ... Purge valve (fluid discharge valve) 110 ... Primary chamber body 110a ... Primary chamber 110b ... Wall surface 111 ... Introductory path 120 ... Secondary chamber body 120a ... Secondary chamber 120b ... Wall surface 121 ... Lead-out path 130 ... Valve body 140 ... Shaft 150 ... Solenoid (drive mechanism)

Claims (1)

A primary chamber body in which a primary chamber into which a fluid is introduced is formed;
A secondary chamber body in which a secondary chamber from which the fluid is derived is formed;
An introduction path for introducing the fluid into the primary chamber;
A lead-out path for leading the fluid from the secondary chamber;
In the fluid discharge valve comprising: a valve body that communicates or blocks between the primary chamber and the secondary chamber and is driven by a drive mechanism;
The valve body is disposed at a position corresponding to a central axis of the primary chamber and the secondary chamber;
The primary chamber and the secondary chamber are arranged in the vertical direction, and the wall surfaces of the primary chamber and the secondary chamber are formed in a circle around the central axis,
The introduction path has an upward slope, and moisture contained in the fluid introduced into the primary chamber flows into the introduction path and is configured to be discharged.
When viewed in plan, with are provided with a predetermined amount offset in the radial direction of the valve body from the line segment passing through the center axis of the introducing path and the outlet path both the valve body, the inner surface of the front Symbol outlet passage and among the corners and the wall surface of the secondary chamber is formed in contact, the outlet passage is arranged Tei Rukoto as corner portion on the downstream side as viewed from the fluid derived from the secondary chamber is an acute angle Fluid discharge valve featuring.

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