JP2013245771A - Control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control valve capable of suppressing a change in pressure even in case where an inner pressure on a drive part side changes or in case where a pressure on a flow passage side changes, capable of suppressing an influence on operation characteristics of the valve owing to the change in pressure, and capable of effectively preventing a valve function from being impeded when water vapor infiltrates into the drive part side and condensed water freezes after sticking to a plunger serving as a drive mechanism of a valving element.SOLUTION: To a valving element, a diaphragm valving element 58 which is a separation membrane member for air-tightly separating a valve chamber 32 from a drive part 34, is attached. A pressure equalization flow passage 68 which communicates the drive part 34 side with flow passage side, is formed. In the pressure equalization flow passage 68, a dew condensation member 74 is disposed at the flow passage side, and a waterproof moisture permeation member 76 at the drive part 34 side.

Description

  The present invention relates to a control valve that controls a fluid, for example, a control valve that is disposed in a wetting fluid channel of a fuel cell system and is suitable for controlling a wetting fluid.

  Conventionally, in a control valve that controls a wetting fluid containing a large amount of moisture such as water vapor, such as a discharge valve disposed in a wetting fluid passage in a fuel cell system of a fuel cell vehicle, the moisture in the wetting fluid is a plunger. May adhere to.

  In this case, if the system is left at a low temperature after the system is stopped, the water adhering to the plunger may freeze, which may cause the plunger to become inoperable. The whole may be affected.

  For this reason, in Patent Document 1 (Japanese Patent Application Laid-Open No. 2008-232352), the valve chamber in which the wetting fluid flows and the drive space in which the plunger is accommodated are hermetically separated by a diaphragm, and moisture adheres to the plunger. An electromagnetic valve that prevents this is disclosed.

  FIG. 6 is a longitudinal sectional view showing an outline of the electromagnetic valve of Patent Document 1. As shown in FIG.

  That is, the electromagnetic valve 100 of Patent Document 1 includes a valve body 102, and the valve body 102 includes an inlet port 104 through which a fluid flows, an outlet port 105 through which the fluid flows out, and an inlet port 104. A valve seat 108 formed with a valve port 106 through which the inflowing fluid passes and a valve chamber 110 are formed.

  A driving unit 112 is fixed to the upper portion of the valve body 102 by a fastening member 114. The drive unit 112 includes a plunger tube 116, and a plunger 118 is accommodated in the plunger tube 116 so as to be movable in the axial direction.

  A suction element 120 is attached to the upper end of the plunger tube 116. A plunger spring 122 is interposed between the plunger 118 and the suction element 120 in a compressed state, and is configured to urge the plunger 118 in a direction away from the suction element 120.

  Further, a valve stem member 126 integrated with the insert fitting 124 is fixed to the lower end of the plunger 118.

  On the other hand, on the outer periphery of the plunger tube 116, the electromagnetic coil 136 is fixed together with the outer box member 134 by tightening a nut 132 to a fastening screw 130 formed on the upper portion of the attractor 120.

  Further, a diaphragm valve body 142 which is a separation membrane member for airtightly separating the valve chamber 110 and the drive space 140 formed in the drive unit 112 is attached to the lower end of the valve rod member 126. . The diaphragm valve body 142 includes a separation membrane portion 144 and a valve body portion 146, and a fixing portion 148 formed on the outer peripheral portion of the separation membrane portion 144 is interposed between the valve body 102 and the drive portion 112. It is fixed by being clamped between the mounted substantially ring-shaped fixing fitting 150 and the valve body 102.

  Further, a taper-shaped fram receiving taper surface 152 is formed on the lower surface of the fixing metal 150, so that when the valve body portion 146 of the diaphragm valve body 142 moves away from the valve seat 108, The diaphragm valve body 142 is configured to be displaced until the separation membrane portion 144 abuts the diaphragm receiving tapered surface 152 and to follow the valve body portion 146.

  In the conventional control valve 100 configured as described above, when the electromagnetic coil 136 is energized, the plunger 118 moves toward the attractor 120 against the urging force of the plunger spring 122, and the plunger 118 The valve body member 146 of the diaphragm valve body 142 attached to the lower end of the valve body member 126 is separated from the valve seat 108 and formed in the valve seat 108. The valve port 106 is opened.

  On the other hand, by stopping energization of the electromagnetic coil 136, the plunger 118 moves in a direction away from the attractor 120 by the biasing force of the plunger spring 122, and the valve rod member 126 fixed to the plunger 118 is moved. The valve body portion 146 of the diaphragm valve body 142 attached to the lower end of the valve stem member 126 abuts against the valve seat 108 so that the valve port 106 formed in the valve seat 108 is closed. It has become.

  Also during such an opening / closing operation, the diaphragm valve body 142 hermetically separates the valve chamber 110 and the drive space 140 formed in the drive unit 112, and thereby wet fluid flowing through the valve chamber 110. Water such as water vapor enters the driving space 140 and is prevented from being frozen by the water adhering to the plunger 118 which is the driving mechanism of the valve body, thereby inhibiting the valve function. Yes.

  However, in such a conventional control valve 100, since the drive space 140 formed in the drive unit 112 is sealed by the diaphragm valve body 142, the drive space formed in the drive unit 112 due to a change in ambient temperature or the like. When the internal pressure on the 140 side changes or when the pressure on the valve chamber 110 side changes, as shown in FIG. 6, the pressure change ΔP is converted to the effective pressure receiving diameter of the separation membrane portion 144 of the diaphragm valve body 142. It will be received at φF (effective area: Af).

  At this time, a load of “Af × ΔP” is generated in the separation membrane portion 144 of the diaphragm valve body 142, and changes the operating characteristics of the valve. For this reason, the operating characteristics of the valve may change due to changes in the temperature of the atmosphere, and the valve may not operate normally.

  That is, the temperature of the drive unit 112 may increase due to an increase in the outside air temperature or a long-time energization of the electromagnetic coil 136, which may increase the internal pressure of the drive space 140 formed in the drive unit 112. .

  Thus, in the state where the internal pressure of the drive space 140 is increased, the load in the valve closing direction having the size of “Af × ΔP” described above is acting on the separation membrane portion 144 of the diaphragm valve body 142. Even if the operating voltage (current) at normal temperature is applied to the electromagnetic coil 136, the control valve does not operate, and the operating voltage (current) applied to the electromagnetic coil 136 is as much as the load of “Af × ΔP” is overcome. I had to make it bigger.

  Conversely, when the temperature of the atmosphere decreases in a cold district or the like, the internal pressure of the drive space 140 formed in the drive unit 112 may decrease and become negative pressure. Further, the pressure on the valve chamber 110 side may increase due to an increase in the pressure of the internal fluid.

  In this case, by stopping energization of the electromagnetic coil 136, the valve body portion 146 of the diaphragm valve body 142 contacts the valve seat 108, and the valve port 106 formed in the valve seat 108 is closed. Nevertheless, the pressure change ΔP ′ due to the decrease in the internal pressure of the drive space 140 formed in the drive unit 112 causes the separation membrane portion 144 of the diaphragm valve body 142 to open in the valve opening direction of “Af × ΔP ′”. There is a possibility that a malfunction may occur in which the valve port 106 formed in the valve seat 108 is opened due to the load of.

  Therefore, conventionally, by separately forming a pressure equalizing flow path in the valve main body 102 so as to communicate between the drive space 140 formed in the drive unit 112 and the valve chamber 110 on the flow path side, The valve operation of the diaphragm valve body 142 is smoothly performed by equalizing the internal pressure of 140 and the pressure on the valve chamber 110 side.

  However, dust and moisture may enter the drive space 140 from the pressure equalizing flow path. In particular, when used at a low temperature, the moisture is frozen by the plunger 118 of the drive unit 112 and the like. In some cases, 118 may not work.

  For this reason, in Patent Document 2 (Japanese Patent Laid-Open No. 2001-227671), a dust-repellent material contained in a fluid on the flow path side is provided by providing a water repellent filter made of a porous body at the opening end of the pressure equalizing flow path on the valve chamber side. A structure for preventing moisture from entering the drive unit 112 side is disclosed.

JP 2008-232352 A JP 2001-227671 A

  However, in such a control valve provided with the water repellent filter disclosed in Patent Document 2, when the fluid is a wetting fluid containing water vapor or the like and used at a low temperature, Does not pass through, but water vapor, which is a gas, passes through the water repellent filter.

  For this reason, when water vapor enters the drive unit side through the water repellent filter, the water vapor is cooled by contact with a plunger or the like which is a drive mechanism of the valve body in the drive unit in a state where the control valve is cooled at a low temperature. Condensed into water. As a result, moisture may freeze with a plunger or the like in the drive unit, causing malfunction, and the control valve may not operate normally.

  In view of such a current situation, the present invention can suppress these pressure changes even when the internal pressure on the drive unit side changes or the pressure on the flow path side changes, and the operation of the valve due to the pressure change It is possible to suppress the influence on the characteristics, and it is effective that water vapor enters the drive part side, condensed water adheres to the plunger that is the drive mechanism of the valve body and freezes, and the valve function is inhibited. It is an object of the present invention to provide a control valve that can be prevented.

The present invention has been invented in order to achieve the problems and objects in the prior art as described above.
A valve chamber with a valve seat having a valve port through which fluid passes;
A drive unit that moves the valve body in the direction of separating and contacting the valve seat;
The valve is moved by the drive unit in a direction in which the valve body is moved away from or in contact with the valve seat, and the valve body is configured to open and close the valve port of the valve seat,
The valve body is equipped with a separation membrane member for hermetically separating the valve chamber and the drive unit,
A pressure equalizing flow path that connects the drive unit side and the flow path side is formed,
In the pressure equalizing flow path, a dew condensation member is disposed on the flow path side,
The pressure equalizing flow path is characterized in that a waterproof and moisture permeable member is disposed on the drive unit side.

  By configuring in this way, a pressure equalizing flow path that connects the drive unit side and the flow channel side is formed, and the drive unit even when the internal pressure on the drive unit side changes or the pressure on the flow channel side changes The side and the channel side are at the same pressure.

  As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and coming into contact with the valve seat, and suppresses the influence on the operating characteristics of the valve due to the pressure change on the drive side and the flow path side. Is possible.

  In addition, since the dew condensation member is disposed on the flow path side in the pressure equalization flow path, when the fluid is a wet fluid containing water vapor or the like and used at a low temperature, the water vapor in the fluid is first dew condensed. Condensed and condensed into water.

  Further, since the waterproof and moisture permeable member is disposed on the drive unit side, the water condensed by the dew condensation member on the drive unit side is not permeated by the waterproof and moisture permeable member, and therefore does not enter the drive unit side.

  Therefore, under low temperatures such as in winter, water vapor enters the drive unit, cools by contact with the plunger, which is the drive mechanism of the valve body, condenses into water, and moisture attached to the plunger freezes. It is possible to effectively prevent the valve function from being hindered, and to provide a control valve that always operates normally and enables a quick system start even at low temperatures.

  Moreover, the control valve of the present invention is characterized in that the dew condensation member is formed of a material having high thermal conductivity.

  As described above, since the dew condensation member is formed of a material having a high thermal conductivity, when the fluid is a wet fluid containing water vapor or the like and is used at a low temperature, the water vapor in the fluid is heated by the dew condensation member. It is easy to condense, condense, and condense into water.

  Thereby, the water | moisture content condensed by the dew condensation member of the drive part side is not permeate | transmitted by the waterproof moisture-permeable member, and effectively prevents permeation into the drive part side by the waterproof / breathable member arranged on the drive part side. be able to.

  In this case, as a material having high thermal conductivity, it is desirable that the thermal conductivity is in the range of 10 to 400 W / m · K, for example.

  The material having such thermal conductivity is not particularly limited. For example, a mesh made of stainless steel such as SUS, a mesh obtained by appropriately combining these meshes, or a steel wool made of stainless steel such as SUS. In addition, a sintered filter that is a porous body in which powders of metal, ceramic, resin, and the like are integrated by sintering can be used.

  Moreover, the control valve of the present invention is characterized in that the heat conductivity of the dew condensation member is larger than the heat conductivity of the waterproof and moisture permeable member.

  With this configuration, since the thermal conductivity of the dew condensation member is larger than the thermal conductivity of the waterproof moisture permeable member, water vapor in the wetting fluid including water vapor is disposed on the drive unit side of the pressure equalization channel. When the dew condensation member is used at a low temperature, the dew condensation member tends to condense first, and tends to condense into water.

  As a result, the waterproof and moisture permeable member disposed on the drive unit side prevents the water condensed by the dew condensation member on the drive unit side from entering the drive unit side without being permeated by the waterproof and moisture permeable member. can do.

  The control valve according to the present invention is characterized in that the waterproof and moisture-permeable member is porous.

  By constituting in this way, since the waterproof and moisture permeable member is porous, moisture is impermeable, but gas passes through the waterproof and moisture permeable member, so when the internal pressure on the drive unit side changes, or Even when the pressure on the flow path side changes, not only the drive unit side and the flow path side have the same pressure, but also dust and the like can be prevented from entering the drive space.

  As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and coming into contact with the valve seat, and suppresses the influence on the operating characteristics of the valve due to the pressure change on the drive side and the flow path side. Is possible.

  In the control valve of the present invention, the dew condensation member is porous.

  With this configuration, since the dew condensation member is porous, the contact area between the water vapor and the dew condensation member is large, and the heat of the water vapor is likely to be taken away by the dew condensation member, so that dew condensation easily occurs. For this reason, water vapor in the wetting fluid containing water vapor or the like is likely to be condensed into water in the dew condensation member.

  As a result, the waterproof and moisture permeable member disposed on the drive unit side prevents the water condensed by the dew condensation member on the drive unit side from entering the drive unit side without being permeated by the waterproof and moisture permeable member. can do.

  Moreover, the control valve of the present invention is characterized in that the separation membrane member constitutes the waterproof and moisture permeable member.

  With this configuration, it is not necessary to separately form a pressure equalizing channel in the valve body so as to communicate between the driving space formed in the driving unit and the channel side, so that the structure is simple and cost-effective. Can be reduced.

  In addition, since the separation membrane member constitutes the waterproof and moisture permeable member, it is not necessary to provide the waterproof and moisture permeable member separately, so that the structure is simple and the cost can be further reduced.

  According to the present invention, since the pressure equalizing flow path that connects the drive unit side and the flow channel side is formed, the drive is performed even when the internal pressure on the drive unit side changes or the pressure on the flow channel side changes. The part side and the flow path side have the same pressure.

  As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and coming into contact with the valve seat, and suppresses the influence on the operating characteristics of the valve due to the pressure change on the drive side and the flow path side. Is possible.

  In addition, since the dew condensation member is disposed on the flow path side in the pressure equalization flow path, when the fluid is a wet fluid containing water vapor or the like and used at a low temperature, the water vapor in the fluid is first dew condensed. Condensed and condensed into water.

  Further, since the waterproof and moisture permeable member is disposed on the drive unit side, the water condensed by the dew condensation member on the drive unit side is not permeated by the waterproof and moisture permeable member, and therefore does not enter the drive unit side.

  Therefore, under low temperatures such as in winter, water vapor enters the drive unit, cools by contact with the plunger, which is the drive mechanism of the valve body, condenses into water, and moisture attached to the plunger freezes. It is possible to effectively prevent the valve function from being hindered, and to provide a control valve that always operates normally and enables a quick system start even at low temperatures.

FIG. 1 is a longitudinal sectional view showing an outline of a control valve of the present invention. FIG. 2 is a partially enlarged view of the control valve of FIG. FIG. 3 is a partially enlarged view similar to FIG. 2 of a control valve according to another embodiment of the present invention. FIG. 4 is a longitudinal sectional view schematically showing a control valve according to another embodiment of the present invention. FIG. 5 is a partially enlarged view of the control valve of FIG. FIG. 6 is a longitudinal sectional view showing an outline of a conventional solenoid valve.

  Hereinafter, embodiments (examples) of the present invention will be described in more detail with reference to the drawings.

  FIG. 1 is a longitudinal sectional view showing an outline of the control valve of the present invention, and FIG. 2 is a partially enlarged view of the control valve of FIG.

  In FIG. 1, the code | symbol 10 has shown the control valve of this invention whole.

  The control valve 10 of this embodiment is an electromagnetic valve, and includes a valve housing 12 that forms a flow path, and a first flow path 14 into which a fluid flows and a second flow path through which the fluid flows out. A flow path 16 is formed.

  Further, for example, it is arranged in a wet fluid flow path of a fuel cell system and used for a control valve for controlling the wet fluid.

  The control valve 10 of this embodiment includes a valve main body 18 accommodated in a valve housing 12, and the valve main body 18 includes an upper main body 20 and a lower main body 22. The upper main body 20 and the lower main body 22 are fastened to each other by a fastening member 70 via a filter member 72.

  Further, the lower body 22 communicates with the first flow path 14, a first port 24 through which fluid flows in, a second port 26 through which fluid communicates with the second flow path 16, and A valve seat 30 in which a valve port 28 through which the fluid flowing in from the first port 24 passes is formed, and a valve chamber 32 is formed.

  In this embodiment, the fluid flows in from the first port 24 and the fluid flows out from the second port 26, but conversely, the fluid flows in from the second port 26, and the first It is also possible to configure the fluid to flow out from the port 24.

  A drive unit 34 is fixed to the upper portion of the upper body 20 of the valve body 18, and the drive unit 34 includes a plunger tube 36. The lower end of the plunger tube 36 is connected to the inner diameter of the upper body 20. It is fixed to the part by brazing or welding.

  A plunger 38 is accommodated in the plunger tube 36 so as to be movable in the axial direction. A suction element 40 is attached to the upper end of the plunger tube 36.

  In addition, a plunger spring 42 is interposed between the plunger 38 and the suction element 40 in a compressed state, and is configured to urge the plunger 38 in a direction away from the suction element 40.

  Further, a valve stem member 46 integral with the insert fitting 44 is fixed to the lower end of the plunger 38.

  On the other hand, on the outer periphery of the plunger tube 36, the electromagnetic coil 52 is fixed together with the outer box member 54 by tightening a nut 50 to a fastening screw 48 formed on the upper portion of the attractor 40.

  Further, a diaphragm valve body 58 that is a separation membrane member for airtightly separating the valve chamber 32 and the drive space 56 formed in the drive unit 34 is attached to the lower end of the valve rod member 46. . The diaphragm valve body 58 includes a separation membrane portion 60 and a valve body portion 62, and the fixing portion 64 formed on the outer peripheral portion of the separation membrane portion 60 is connected to the upper body 20 and the lower body 22 of the valve body 18. It is fixed by being sandwiched between a substantially ring-shaped fixing member 66 interposed between the lower main body 22 and the lower main body 22.

  The material constituting the diaphragm valve body 58 is not particularly limited, and in consideration of heat resistance, pressure resistance, etc., for example, a resin such as rubber or fluororesin can be appropriately changed and used. .

  Further, in the control valve 10 of the present invention, the pressure equalizing flow path 68 is formed so as to communicate between the drive space 56 formed in the drive unit 34 and the flow path side, that is, the valve chamber 32. Thus, the diaphragm valve element 58 is smoothly operated by equalizing the internal pressure of the drive space 56 and the pressure on the valve chamber 32 side.

  Specifically, as shown in FIGS. 1 and 2, a filter member 72 is interposed between the outer periphery of the upper end portion 22 a of the lower main body 22 and the inner periphery of the lower end portion 20 a of the upper main body 20. A ring-shaped fastening member 70 is attached.

  That is, the fastening member 70 is mounted by screwing the screw portion formed on the inner periphery of the lower end portion 20 a of the upper body 20 and the screw portion formed on the outer periphery of the fastening member 70. A first pressure equalizing flow path 68a is formed inside.

  The filter member 72 is locked between the locking portion 70 a protruding from the inner peripheral side of the lower end of the fastening member 70 and the upper end portion 22 a of the lower main body 22, so that the valve housing 12 Dust and the like are configured not to enter the valve chamber 32 from the formed second flow path 16 through the second port 26 formed in the lower main body 22.

  As shown in FIG. 2, a substantially ring-shaped dew condensation member 74 is disposed between the upper main body 20 and the upper end portion 70 b of the fastening member 70, that is, on the flow path side of the pressure equalization flow path 68.

  Further, a second pressure equalizing flow path 68b that communicates with the first pressure equalizing flow path 68a and the dew condensation member 74 and extends from the outer peripheral side to the inner peripheral side of the lower main body 22 is formed at the upper end portion 22a of the lower main body 22. Yes.

  Further, as shown in FIG. 2, a substantially ring-shaped third pressure equalizing flow path 68c is formed in the fixing member 66 so as to communicate with the second pressure equalizing flow path 68b. Further, a housing recess 78 for the waterproof and moisture permeable member 76 is formed at the upper end portion of the fixing member 66, and the substantially moisture-resistant waterproof and moisture permeable member 76 is formed in the housing recess 78 of the waterproof and moisture permeable member 76. Is communicated with the third pressure equalizing channel 68c by a fourth pressure equalizing channel 68d provided at the lower end of the accommodating recess 78. That is, the waterproof and moisture permeable member 76 is disposed on the drive unit 34 side of the pressure equalizing flow path 68.

  A presser fitting 80 is mounted between the accommodating recess 78 and the upper main body 20. A fifth pressure equalizing flow path 68e that communicates with the second pressure equalizing flow path 68b and the waterproof / moisture permeable member 76 and with the drive space 56 formed in the drive section 34 is formed inside the presser fitting 80. ing.

  Furthermore, as shown in FIG. 2, a substantially ring-shaped seal projecting portion 78 a is formed at the bottom of the accommodating recess 78 at the upper end of the fixing member 66. It is comprised so that between may be sealed. Further, a seal member 82 such as an O-ring is mounted between the inner peripheral side of the upper main body 20 and the fixing member 66.

  In the control valve 10 of the present invention configured as described above, the fastening member 70 is fastened to the lower end portion 20a of the upper main body 20, whereby the filter member 72, the lower main body 22, the dew condensation member 74, the fixing member 66, the waterproof and moisture permeable member. 76 and the presser fitting 80 are integrally assembled to the upper main body 20.

  As shown by the arrows in FIG. 2, the first pressure equalizing flow path 68 a formed in the fastening member 70, the dew condensation member 74, the second pressure equalizing flow path 68 b formed in the lower main body 22, and the third pressure formed in the fixing member 66. The pressure equalization flow path 68c is formed by the pressure equalization flow path 68c, the fourth pressure equalization flow path 68d, the waterproof and moisture permeable member 76, and the fifth pressure equalization flow path 68e formed in the presser fitting 80.

  With this configuration, the pressure equalizing flow path 68 that connects the drive unit 34 side and the flow path side is formed. Therefore, when the internal pressure on the drive unit 34 side changes or on the flow path side (valve chamber 32 side) ) Also changes, the drive unit 34 side and the flow path side have the same pressure.

  As a result, the diaphragm valve body 58, which is a separation membrane member, does not affect the movement of the diaphragm valve body 58 in the direction of separating from and coming into contact with the valve seat 30, and is caused by pressure changes on the drive unit 34 side and the flow path side. It is possible to suppress the influence on the operating characteristics of the valve.

  In addition, since the dew condensation member 74 is disposed on the flow path side in the pressure equalization flow path 68, when the fluid is a wet fluid containing water vapor or the like and used at a low temperature, Condensation is caused by the dew condensation member 74 and condensed into water.

  Further, since the waterproof and moisture permeable member 76 is disposed on the drive unit 34 side, the water condensed by the dew condensation member 74 on the valve chamber 32 side is not permeated by the waterproof and moisture permeable member 76 and therefore enters the drive unit 34 side. There is nothing.

  Accordingly, when the temperature is low, such as in winter, water vapor enters the drive unit 34 and is cooled by contact with the plunger 38 which is the drive mechanism of the diaphragm valve body 58, condensing into water, and adhering to the plunger 38, etc. Provided is a control valve 10 that can effectively prevent moisture from being frozen and hinder the valve function, always operate normally, and enable quick system startup even at low temperatures. it can.

In this case, it is desirable that the dew condensation member 74 is formed of a material having high thermal conductivity.
As described above, since the dew condensation member 74 is formed of a material having a high thermal conductivity, when the fluid is a wet fluid containing water vapor or the like and is used at a low temperature, the water vapor in the fluid is dewed. The heat is taken away and condensed, and it is easy to condense and become water.

  As a result, the water condensed by the dew condensation member 74 on the valve chamber 32 side is not permeated by the waterproof moisture permeable member 76 by the waterproof moisture permeable member 76 arranged on the drive unit 34 side, and enters the drive unit side. It can be effectively prevented.

  In this case, it is desirable that the material having a high thermal conductivity constituting the dew condensation member 74 has a thermal conductivity in the range of 10 to 400 W / m · K, for example.

  The material having such thermal conductivity is not particularly limited. For example, a mesh made of stainless steel such as SUS, a mesh obtained by appropriately combining these meshes, or a steel wool made of stainless steel such as SUS. In addition, a sintered filter that is a porous body in which powders of metal, ceramic, resin, and the like are integrated by sintering can be used.

  In this case, the dew condensation member 74 may be a single layer of these members, or these members may be combined in multiple layers.

  Further, it is desirable that the thermal conductivity of the dew condensation member 74 is larger than the thermal conductivity of the waterproof moisture permeable member 76.

  With this configuration, the heat conductivity of the dew condensation member 74 is larger than the heat conductivity of the waterproof moisture permeable member 76, so that the water vapor in the wetting fluid containing water vapor or the like is driven by the drive unit 34 of the pressure equalization channel 68. In the dew condensation member 74 arranged on the side, when used at a low temperature, the dew condensation member 74 first takes heat away and tends to condense, condensing easily into water.

  Thereby, the water condensed by the dew condensation member 74 on the drive unit 34 side is not permeated by the waterproof moisture transmission member 76 and enters the drive unit 34 side by the waterproof moisture transmission member 76 arranged on the drive unit 34 side. Can be prevented more effectively.

  Moreover, it is desirable that the waterproof and moisture permeable member 76 is porous.

  With this configuration, since the waterproof and moisture permeable member 76 is porous, moisture is impermeable, but since gas passes through the waterproof and moisture permeable member 76, the internal pressure on the drive unit 34 side has changed. In this case, or when the pressure on the flow path side is changed, not only the drive unit side and the flow path side have the same pressure, but also dust and the like can be prevented from entering the drive space.

  As a result, the diaphragm valve element 58, which is a separation membrane member, does not affect the movement of the diaphragm valve element 58 in the direction of separating from and contacting the valve seat 30, and the change in pressure affects the operating characteristics of the valve. It is possible to suppress.

  On the other hand, the waterproof / moisture permeable member of the porous body is not particularly limited as long as it has a property of not transmitting water and the like and is permeable to gas. For example, polytetrafluoroethylene is stretched. "Gore-Tex (registered trademark)" (manufactured by WL Gore & Associates) or "Microvent (registered trademark)" (manufactured by Taisei Plus Co., Ltd.), which is a composite of the film and polyurethane polymer, can be used.

  Moreover, it is desirable that the dew condensation member 74 is porous.

  With this configuration, since the dew condensation member 74 is porous, the contact area between the water vapor and the dew condensation member 74 is large, and the heat of the water vapor tends to be taken away by the dew condensation member 74, so that dew condensation easily occurs. For this reason, the water vapor in the wetting fluid containing water vapor etc. tends to condense in the dew condensation member 74 to become water.

  Thereby, the water condensed by the dew condensation member 74 on the drive unit 34 side is not permeated by the waterproof moisture transmission member 76 and enters the drive unit 34 side by the waterproof moisture transmission member 76 arranged on the drive unit 34 side. Can be prevented more effectively.

  In the control valve 10 of the present invention configured as described above, when the electromagnetic coil 52 is energized, the plunger 38 moves in the direction of the attractor 40 against the urging force of the plunger spring 42, and the plunger The valve stem member 46 fixed to 38 moves upward, and the valve body portion 62 of the diaphragm valve body 58 attached to the lower end of the valve stem member 46 is separated from the valve seat 30 and formed in the valve seat 30. The valve port 28 is opened.

  On the other hand, by stopping energization of the electromagnetic coil 52, the plunger 38 is moved away from the attractor 40 by the biasing force of the plunger spring 42, and the valve stem member 46 fixed to the plunger 38 is moved. The valve body portion 62 of the diaphragm valve body 58 attached to the lower end of the valve stem member 46 contacts the valve seat 30 so that the valve port 28 formed in the valve seat 30 is closed. It has become.

  FIG. 3 is a partially enlarged view similar to FIG. 2 of a control valve according to another embodiment of the present invention.

  The control valve 10 of this embodiment has basically the same configuration as that of the control valve 10 of Embodiment 1 shown in FIGS. 1 to 2, and the same reference numerals are assigned to the same components. Detailed description thereof will be omitted.

  In the control valve 10 of this embodiment, as shown in FIG. 3, the dew condensation member 74 is disposed in the fourth pressure equalizing flow path 68 d formed in the fixing member 66 so as to contact the waterproof moisture permeable member 76. ing. Thus, the dew condensation member 74 and the waterproof moisture permeable member 76 can be disposed adjacent to each other.

  4 is a longitudinal sectional view schematically showing a control valve according to another embodiment of the present invention, and FIG. 5 is a partially enlarged view of the control valve of FIG.

  The control valve 10 of this embodiment has basically the same configuration as that of the control valve 10 of Embodiment 1 shown in FIGS. 1 to 2, and the same reference numerals are assigned to the same components. Detailed description thereof will be omitted. In FIG. 4, for convenience of explanation, the valve housing 12 that forms the flow path, the first flow path 14 into which the fluid flows in, and the second flow path 16 through which the fluid flows out are omitted. .

  In the control valve 10 of this embodiment, as shown in FIGS. 4 to 5, the diaphragm 59 itself, which is a separation membrane member, constitutes a waterproof and moisture permeable member 76. For this reason, a substantially cup-shaped guide fitting 84 having an opening at the lower end is inserted into the mounting hole 59 a formed at the center of the diaphragm 59, and the valve stem member 46 is inserted into the insertion hole 84 a formed at the center of the guide fitting 84. The lower end 46a is inserted. The valve stem member 46, the diaphragm 59, and the guide fitting 84 are integrally fixed by spot welding or the like.

  In addition, in this guide metal fitting 84, the abutting member 86 and the valve body 88 are fixed and integrated with the valve pressing metal fitting 90 on the inner periphery of the guide metal fitting 84 by, for example, press fitting.

  A dew condensation member 74 is attached to a substantially ring-shaped fixed ring member 92 disposed between the outer periphery of the guide fitting 84 and the inner periphery of the lower main body 22. Further, a seal member 94 such as an O-ring is mounted on the inner peripheral side of the fixed ring member 92, and the guide fitting 84, that is, the valve body 88 can slide up and down on the inner periphery of the seal member 94. It is configured as follows. Thus, water vapor or the like is prevented from flowing through the gap between the inner periphery of the seal member 94 and the guide fitting 84.

  In the control valve 10 of this embodiment, the fastening member 70 is mounted by screwing the screw portion formed on the inner periphery of the fastening member 70 to the screw portion formed on the outer periphery of the lower end portion 20a of the upper body 20. Has been.

  With this configuration, the pressure equalizing flow path 68 is formed by the dew condensation member 74, the diaphragm 59, and the gap S between the fixed member 66 and the valve stem member 46, as indicated by the arrows in FIG. 5. .

  As a result, it is not necessary to separately form the pressure equalizing flow path 68 in the valve body 18 so as to communicate between the drive space 56 formed in the drive section 34 and the flow path side, so that the structure is simple and the cost is reduced. Can be reduced.

  Moreover, since the diaphragm 59 itself, which is the separation membrane member, constitutes the waterproof and moisture permeable member 76, it is not necessary to provide the waterproof and moisture permeable member 76 separately, so that the structure is simple and the cost can be further reduced. .

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to this. In the above embodiment, the control valve is disposed in the wet fluid flow path in the fuel cell system of the fuel cell vehicle. However, various modifications can be made without departing from the object of the present invention, such as being applicable to a control valve of a cooling / heating circuit such as an air conditioner, a water heater, and a control valve of a plant.

  The control valve for controlling the fluid can be applied to, for example, a control valve that is disposed in the wet fluid flow path of the fuel cell system and is suitable for controlling the wet fluid.

DESCRIPTION OF SYMBOLS 10 Control valve 12 Valve housing 14 1st flow path 16 2nd flow path 18 Valve main body 20 Upper main body 20a Lower end part 22 Lower main body 22a Upper end part 24 1st port 26 2nd port 28 Valve port 30 Valve seat 32 Valve chamber 34 Drive section 36 Plunger tube 38 Plunger 40 Suction element 42 Plunger spring 44 Insert metal fitting 46 Valve rod member 46a Lower end 48 Fastening screw 50 Nut 52 Electromagnetic coil 54 Outer member 56 Drive space 58 Diaphragm valve element 59 Diaphragm 59a Mounting hole 60 Separation membrane part 62 Valve body part 64 Fixing part 66 Fixing member 68 Pressure equalizing channel 68a First pressure equalizing channel 68b Second pressure equalizing channel 68c Third pressure equalizing channel 68d Fourth pressure equalizing channel 68e First 5 pressure equalizing flow path 70 Fastening member 70a Locking part 70b Upper end part 72 Filter member 74 Condensing member 76 Waterproof moisture-permeable member 7 8 Containing recess 78a Seal projecting portion 80 Presser fitting 82 Seal member 84 Guide metal fitting 84a Guide metal insertion hole 86 Metal member 88 Valve body 90 Valve presser fitting 92 Fixing ring member 94 Seal member 100 Solenoid valve 102 Valve body 104 Inlet port 105 Outlet port 106 Valve port 108 Valve seat 110 Valve chamber 112 Driving part 114 Fastening member 116 Plunger tube 118 Plunger 120 Suction element 122 Plunger spring 124 Insert metal fitting 126 Valve rod member 130 Fastening screw 132 Nut 134 Outer box member 136 Electromagnetic Coil 140 Driving space 142 Diaphragm valve element 144 Separation membrane part 146 Valve element part 148 Fixing part 150 Fixing fitting 152 Tapered surface

Claims (6)

A valve chamber with a valve seat having a valve port through which fluid passes;
A drive unit that moves the valve body in the direction of separating and contacting the valve seat;
The valve is moved by the drive unit in a direction in which the valve body is moved away from or in contact with the valve seat, and the valve body is configured to open and close the valve port of the valve seat,
The valve body is equipped with a separation membrane member for hermetically separating the valve chamber and the drive unit,
A pressure equalizing flow path that connects the drive unit side and the flow path side is formed,
In the pressure equalizing flow path, a dew condensation member is disposed on the flow path side,
A control valve, wherein a waterproof and moisture permeable member is disposed on the drive unit side in the pressure equalizing flow path.   The control valve according to claim 1, wherein the dew condensation member is made of a material having high thermal conductivity.   The control valve according to claim 1, wherein a thermal conductivity of the dew condensation member is larger than a thermal conductivity of the waterproof moisture permeable member.   The control valve according to any one of claims 1 to 3, wherein the waterproof and moisture-permeable member is porous.   The control valve according to claim 1, wherein the dew condensation member is porous.   The control valve according to claim 1, wherein the separation membrane member constitutes the waterproof and moisture-permeable member.

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