JP6099890B2 - Control valve - Google Patents

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 unit 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. 21 is a longitudinal sectional view showing an outline of the electromagnetic valve of Patent Document 1. As shown in FIG.
That is, the control 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 a fluid flows out, and the 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.

Furthermore, a valve stem member 126 integral 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.

JP 2008-232352 A

  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 the pressure on the valve chamber 110 side changes, as shown in FIG. 21, 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 space 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.

  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 valve chamber side changes. Control that can suppress the influence on the operating characteristics, and can effectively prevent the valve function from being hindered by freezing water on the plunger that is the drive mechanism of the valve body. The purpose is to provide a valve.

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 for moving the valve body in a direction of separating and contacting the valve seat;
A drive space formed in the drive unit and hermetically sealed;
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,
A separation membrane member for airtightly separating the valve chamber and the drive space formed in the drive unit is attached to the valve body,
The separation membrane portion of the separation membrane member is in contact with a fixed member having a flat plane,
Between the valve body and the separation membrane portion of the separation membrane member, a pressure-sensitive portion that can expand and contract in the radial direction by a pressure change in the driving space is formed.

  With this configuration, the separation membrane portion of the separation membrane member is in contact with a fixed member having a flat plane, so that the separation membrane portion of the separation membrane member is displaced even when pressure is applied from the valve chamber side. There is nothing to do.

Even when the pressure on the drive unit side changes, the separation membrane portion of the separation membrane member does not have a pressure receiving surface, so that the separation membrane portion of the separation membrane member is displaced even when pressure is received from the drive portion side. There is nothing.
In addition, a pressure-sensitive part that can expand and contract in the radial direction by a pressure change on the drive part or valve chamber side is formed between the separation membrane part and the valve body part of the separation membrane member, so that the pressure on the drive part side increases. In this case, the pressure-sensitive part swells outward in the radial direction, and conversely, when the pressure on the drive part side decreases, the pressure-sensitive part contracts radially inward.

  Thereby, even when the internal pressure on the drive unit side changes or the pressure on the valve chamber side changes, these pressure changes can be suppressed by expanding and contracting in the radial direction.

As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and contacting the valve seat, and it is possible to suppress the influence on the operating characteristics of the valve due to the pressure change.
In addition, since it has a separation membrane member for hermetically separating the valve chamber and the drive section, moisture adheres to the plunger that is the drive mechanism of the valve body and freezes, and the valve function is inhibited. Can be prevented.

  In addition, since the pressure sensitive part expands and contracts in the axial direction with respect to the movement of the valve body in the direction of separating from and coming into contact with the valve seat, the separation membrane member follows the drive of the valve body, and the function of the valve body Will not be disturbed.

  In the control valve of the present invention, the separation membrane member is a separation membrane member in which a separation membrane portion, a pressure-sensitive portion, and a valve body portion constituting a valve body are integrally formed. To do.

  By constituting in this way, the separation membrane member is a separation membrane member in which the separation membrane portion, the pressure sensitive portion, and the valve body portion constituting the valve body are integrally formed. The effect of airtightly separating the drive space formed in the drive unit is excellent.

  The control valve according to the present invention is characterized in that the pressure sensitive part of the separation membrane member is fixed to a valve body part constituting a valve body of the valve rod member.

  By comprising in this way, since the pressure sensitive part of a separation membrane member is being fixed to the valve body part which comprises the valve body of a valve stem member, the shape of a separation membrane member can be simplified and cost can be reduced. Can do.

  The control valve according to the present invention is characterized in that a separation membrane portion of the separation membrane member and a flat plane of the fixing member are fixed.

  In this way, if the separation membrane portion of the separation membrane member and the flat planar surface of the fixing member are fixed by various fixing methods such as adhesion and welding, the separation membrane portion is peeled off from the flat plane of the fixing member. Since there is no possibility of doing so, the pressure-sensitive part can be easily set.

The control valve according to the present invention is characterized in that the pressure-sensitive portion of the separation membrane member is formed of a bent portion bent inward or outward in the radial direction in a sectional view in the axial direction.
With this configuration, even when the internal pressure on the drive unit side changes or when the pressure on the valve chamber side changes, the bent part of the pressure-sensitive part expands and contracts in the radial direction (the degree of bending changes). ) To suppress these pressure changes.

As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and contacting the valve seat, and it is possible to suppress the influence on the operating characteristics of the valve due to the pressure change.
In addition, the bending part of the pressure-sensitive part expands and contracts in the axial direction (the bending degree changes) with respect to the movement of the valve body in the direction of separating from and coming into contact with the valve seat. The member follows and does not hinder the function of the valve body.

The control valve according to the present invention is characterized in that the pressure-sensitive portion of the separation membrane member is formed of a bent portion formed in a bellows shape in a sectional view in the axial direction.
With this configuration, even when the internal pressure on the drive unit side changes or the pressure on the valve chamber side changes, the bent portion formed in the bellows shape of the pressure-sensitive unit has an axial cross section. By visually expanding and contracting in the radial direction, these pressure changes can be suppressed.

As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and contacting the valve seat, and it is possible to suppress the influence on the operating characteristics of the valve due to the pressure change.
Moreover, since the bent portion formed in the bellows shape of the pressure-sensitive portion expands and contracts in the axial direction with respect to the movement of the valve body in the direction of separating from and contacting the valve seat, the separation membrane member is used for driving the valve body. Does not obstruct the function of the valve body.

  In the control valve according to the present invention, the bellows-shaped bent portion is formed such that the central bellows has a smaller radial unevenness in the axial cross-section than the bellows at both ends. It is characterized by that.

  In this way, if the bellows-shaped bent portion is formed such that the central bellows has a smaller radial unevenness in the axial cross-sectional view than the bellows at both ends, the internal pressure on the drive unit side can be reduced. When the pressure changes, or when the pressure on the valve chamber side changes, the bellows at the center portion easily expands and contracts in the radial direction, thereby suppressing the pressure change.

In the control valve of the present invention, the pressure-sensitive portion of the separation membrane member is formed of a bent portion formed in a bellows shape in a cross-sectional view in the radial direction.
With this configuration, even when the internal pressure on the drive unit side changes or the pressure on the valve chamber side changes, the bent portion formed in the bellows shape of the pressure-sensitive unit has a radial cross section. By visually expanding and contracting in the radial direction, these pressure changes can be suppressed.

As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and contacting the valve seat, and it is possible to suppress the influence on the operating characteristics of the valve due to the pressure change.
The control valve according to the present invention is characterized in that the thickness of the pressure-sensitive portion of the separation membrane member is smaller than the thickness of the separation membrane portion.

  If the pressure-sensitive part thickness of the separation membrane member is formed to be smaller than the thickness of the separation membrane part as described above, the internal pressure on the drive part side changes or the pressure on the valve chamber side changes In addition, the pressure sensitive part of the separation membrane member is easily expanded and contracted in the radial direction, thereby suppressing a pressure change.

In the control valve according to the present invention, the pressure sensitive part of the separation membrane member is formed of a material softer than the separation membrane part.
Thus, if the pressure sensitive part of the separation membrane member is formed of a material softer than the separation membrane part, the separation is performed when the internal pressure on the drive unit side changes or the pressure on the valve chamber side changes. The pressure-sensitive portion of the membrane member can easily expand and contract in the radial direction, thereby suppressing a pressure change.

According to the present invention, since the separation membrane portion of the separation membrane member is in contact with the fixed member having a flat plane, the separation membrane portion of the separation membrane member is displaced even when receiving pressure from the valve chamber side. There is no.
Even when the pressure on the drive unit side changes, the separation membrane portion of the separation membrane member does not have a pressure receiving surface, so that the separation membrane portion of the separation membrane member is displaced even when pressure is received from the drive portion side. There is nothing.

  In addition, a pressure-sensitive part that can expand and contract in the radial direction by a pressure change on the drive part or valve chamber side is formed between the separation membrane part and the valve body part of the separation membrane member, so that the pressure on the drive part side increases. In this case, the pressure-sensitive part swells outward in the radial direction, and conversely, when the pressure on the drive part side decreases, the pressure-sensitive part contracts radially inward.

  Thereby, even when the internal pressure on the drive unit side changes or the pressure on the valve chamber side changes, these pressure changes can be suppressed by expanding and contracting in the radial direction.

As a result, the separation membrane member does not affect the movement of the valve body in the direction of separating from and contacting the valve seat, and it is possible to suppress the influence on the operating characteristics of the valve due to the pressure change.
In addition, since it has a separation membrane member for hermetically separating the valve chamber and the drive section, moisture adheres to the plunger that is the drive mechanism of the valve body and freezes, and the valve function is inhibited. Can be prevented.

  In addition, since the pressure-sensitive part expands and contracts in the axial direction with respect to the movement of the valve body in the direction of separating from and contacting the valve seat, the deformation of the pressure-sensitive part follows the drive of the valve body part. Does not obstruct body displacement.

FIG. 1 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to the present invention. FIG. 2 is a partially enlarged view illustrating a state when the control valve of FIG. 1 is opened. FIG. 3 is a partially enlarged view illustrating a state when the control valve of FIG. 1 is closed. FIG. 4 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is increased while the control valve of FIG. 1 is closed. FIG. 5 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is lowered while the control valve of FIG. 1 is closed. FIG. 6 is a partially enlarged view similar to FIG. 3 for explaining the state when the control valve of another embodiment of the present invention is closed. FIG. 7 is a radial cross-sectional view of a control valve diaphragm 52 of another embodiment of the present invention. FIG. 8 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention. FIG. 9 is a partially enlarged view for explaining a state when the control valve of FIG. 8 is opened. FIG. 10 is a partially enlarged view illustrating a state when the control valve of FIG. 8 is closed. FIG. 11 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is increased while the control valve of FIG. 8 is closed. FIG. 12 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is lowered while the control valve of FIG. 8 is closed. FIG. 13 is an axial sectional view of a diaphragm 52 of a control valve according to another embodiment of the present invention. FIG. 14 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention. 15 is a partially enlarged cross-sectional view of the control valve of FIG. FIG. 16 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention. FIG. 17 is a partially enlarged view for explaining a state when the control valve of FIG. 16 is opened. FIG. 18 is a partially enlarged view illustrating a state when the control valve of FIG. 16 is closed. FIG. 19 is a partially enlarged view illustrating a case where the internal pressure on the drive unit side is increased in the state where the control valve of FIG. 16 is closed. FIG. 20 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is lowered while the control valve of FIG. 16 is closed. FIG. 21 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 schematically showing an electromagnetic valve of the control valve of the present invention, FIG. 2 is a partially enlarged view for explaining a state when the control valve of FIG. 1 is opened, and FIG. 3 is a control of FIG. FIG. 4 is a partially enlarged view for explaining the state when the valve is closed, FIG. 4 is a partially enlarged view for explaining the case where the internal pressure on the drive unit side is increased in the state when the control valve of FIG. 1 is closed, and FIG. FIG. 2 is a partial enlarged view for explaining a case where the internal pressure on the drive unit side is lowered in a state where the control valve of FIG. 1 is closed.

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 for convenience of explanation, a valve housing that forms a flow path is omitted.

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 according to this embodiment includes a valve body 12, and the valve body 12 includes an upper body 11 and a lower body 13. The upper main body 11 and the lower main body 13 are fixed to each other by caulking or the like.

  Further, the lower body 13 is formed with a first port 14 through which a fluid flows, a second port 15 through which the fluid flows out, and a valve port 16 through which the fluid flowing in from the first port 14 passes. A valve seat 18 and a valve chamber 20 are formed.

  In this embodiment, the fluid flows in from the first port 14 and the fluid flows out of the second port 15, but conversely, the fluid flows in from the second port 15, It is also possible to configure the fluid to flow out from the port 14.

  A drive unit 22 is fixed to the upper portion of the upper body 11 of the valve body 12, and the drive unit 22 includes a plunger tube 26. The lower end of the plunger tube 26 is connected to the inner diameter of the upper body 11. It is fixed to the part by brazing or welding.

  A plunger 28 is accommodated in the plunger tube 26 so as to be movable in the axial direction. A suction element 30 is attached to the upper end of the plunger tube 26.

  A plunger spring 32 is interposed between the plunger 28 and the suction element 30 in a compressed state, and is configured to urge the plunger 28 in a direction away from the suction element 30.

Further, a valve stem member 36 integrated with the insert fitting 34 is fixed to the lower end of the plunger 28.
On the other hand, on the outer periphery of the plunger tube 26, the electromagnetic coil 46 is fixed together with the outer box member 44 by fastening a nut 42 to a fastening screw 40 formed on the upper portion of the attractor 30.

  Further, a diaphragm valve body 52 that is a separation membrane member for airtightly separating the valve chamber 20 and the drive space 50 formed in the drive unit 22 is attached to the lower end of the valve rod member 36. . The diaphragm valve body 52 includes a separation membrane portion 54 and a valve body portion 56, and the fixing portion 58 formed on the outer peripheral portion of the separation membrane portion 54 is connected to the upper body 11 and the lower body 13 of the valve body 12. It is fixed by being sandwiched between a substantially ring-shaped fixing member 60 and the lower main body 13 interposed therebetween.

  As shown in FIGS. 2 and 3, the diaphragm valve body 52 is formed with a pressure-sensitive portion 51 that can expand and contract in the radial direction by a pressure change between the separation membrane portion 54 and the valve body portion 56. ing. In this embodiment, the pressure-sensitive portion 51 is constituted by a bent portion that is bent inward in the radial direction in a sectional view in the axial direction.

  In this case, as shown in FIG. 3, the bending angle α of the pressure-sensitive portion 51 is such that, as will be described later, when the pressure on the drive portion 22 side increases, the pressure-sensitive portion 51 bulges outward in the radial direction. In addition, when the pressure on the drive unit 22 side decreases, the pressure-sensitive portion 51 contracts radially inward so that these pressure changes can be suppressed to 60 to 160 °. Is desirable.

Further, it is desirable that the thickness of the pressure-sensitive portion 51 of the diaphragm valve body 52 is smaller than the thickness of the separation membrane portion 54.
Thus, if the thickness of the pressure sensitive part 51 of the diaphragm valve body 52 is formed smaller than the thickness of the separation membrane part 54, the internal pressure on the drive part 22 side changes, or the valve chamber 20 side When the pressure changes, the pressure-sensitive portion 51 of the diaphragm valve body 52 easily expands and contracts in the radial direction, thereby suppressing the pressure change.

Furthermore, although the diaphragm valve body 52 may be composed of one material, the separation membrane portion 54, the valve body portion 56, and the pressure sensing portion 51 can be composed of different materials.
In this case, it is desirable that the pressure-sensitive portion 51 of the diaphragm valve body 52 is formed of a material softer than the separation membrane portion 54.

  Thus, if the pressure sensitive part 51 of the diaphragm valve body 52 is formed of a material softer than the separation membrane part 54, the internal pressure on the drive part 22 side changes or the pressure on the valve chamber 20 side changes. In this case, the pressure-sensitive portion 51 of the diaphragm valve body 52 is easily expanded and contracted in the radial direction, thereby suppressing a pressure change.

  The material constituting the diaphragm valve body 52 is not particularly limited, and in consideration of heat resistance, pressure resistance, etc., for example, a resin such as rubber or fluororesin, a metal, or the like is appropriately changed and used. be able to.

  In the control valve 10 of the first embodiment, the diaphragm valve body 52 constituting the separation membrane member is integrally formed with the separation membrane portion 54, the pressure sensing portion 51, and the valve body portion 56 constituting the valve body. This is a separation membrane member.

  With such a configuration, the diaphragm valve body 52 constituting the separation membrane member is separated from the separation membrane portion 54, the pressure sensitive portion 51, and the valve body portion 56 constituting the valve body. Since it is a membrane member, it is excellent in the effect of airtightly separating between the valve chamber 20 and the drive space 50 formed in the drive unit 22.

  In the control valve 10 of the present invention configured as described above, when the electromagnetic coil 46 is energized, the plunger 28 moves in the direction of the attractor 30 against the urging force of the plunger spring 32, and the plunger The valve stem member 36 fixed to 28 moves upward, and the valve body portion 56 of the diaphragm valve body 52 attached to the lower end of the valve stem member 36 is separated from the valve seat 18 and formed in the valve seat 18. The valve port 16 is opened.

  At this time, as indicated by an arrow in FIG. 2, when the valve body portion 56 of the diaphragm valve body 52 moves in a direction away from the valve seat 18, the pressure-sensitive portion 51 of the diaphragm valve body 52 moves in the axial direction. By contracting and following, the displacement of the valve body portion 56 is not hindered.

  On the other hand, by stopping energization of the electromagnetic coil 46, the plunger 28 moves in a direction away from the attractor 30 by the biasing force of the plunger spring 32, and the valve stem member 36 fixed to the plunger 28 is moved. As shown in FIG. 3, the valve body portion 56 of the diaphragm valve body 52 attached to the lower end of the valve stem member 36 is in contact with the valve seat 18 to form the valve seat 18. The valve port 16 is closed.

  In this case, as shown in FIG. 1, the separation membrane portion 54 of the diaphragm valve body 52 is in contact with the lower surface of the fixing member 60 having a flat plane. Even if it receives pressure from the valve chamber 20 side, it does not displace.

  In addition, the separation membrane portion 54 of the diaphragm valve body 52 is also in contact with the lower surface of the fixing member 60 having a flat plane against the pressure change on the drive portion 22 side. Does not flow in, and the separation membrane portion 54 of the diaphragm valve body 52 has no pressure receiving surface. For this reason, the separation membrane part 54 of the diaphragm valve body 52 is not displaced even if it receives pressure from the drive part 22 side.

  In addition, since the pressure sensitive part 51 that can expand and contract in the radial direction is formed between the separation membrane part 54 and the valve body part 56 of the diaphragm valve body 52 by the pressure change on the drive part 22 or the valve chamber 20 side. When the pressure on the 22 side increases (when the pressure on the valve chamber 20 side decreases), as shown by the arrow in FIG. 4, the pressure-sensitive portion 51 swells outward in the radial direction.

Conversely, when the pressure on the drive unit 22 side decreases (when the pressure on the valve chamber 20 side increases), as shown by the arrow in FIG. 5, the pressure-sensitive unit 51 contracts radially inward. Become.
As a result, even when the internal pressure on the drive unit 22 side changes or the pressure on the valve chamber 20 side changes, the pressure-sensitive unit 51 expands and contracts in the radial direction (the degree of bending changes). The pressure change can be suppressed.

  As a result, the diaphragm valve body 52, which is a separation membrane member, does not affect the movement of the valve body portion 56 in the direction of separating from and contacting the valve seat 18, and the change in pressure affects the operating characteristics of the valve. It is possible to suppress.

  Note that the size of the pressure-sensitive part 51 so that only the pressure-sensitive part 51 expands and contracts in the radial direction (the degree of bending changes) is not changed, and the separation film part 54 is not displaced. What is necessary is just to determine from the relationship of temperature change-volume change represented by the state equation of gas from use conditions, such as the temperature rise by energization, ambient temperature change, and the internal volume of the drive part 22.

  Further, if the flat surface of the fixing member 60 and the separation membrane portion 54 are fixed by various fixing methods such as adhesion and welding, the separation membrane portion 54 may not be peeled off from the flat surface of the fixing member 60. The pressure sensitive unit 51 can be easily set.

  In addition, the pressure-sensitive portion 51 expands and contracts in the axial direction (the degree of bending changes) in response to the movement of the valve body portion 56 in the direction of separating from and contacting the valve seat 18, so that the valve body portion 56 is driven. Since the deformation of the pressure-sensitive part 51 follows, the displacement of the valve body part 56 is not hindered.

  Also during such an opening / closing operation, the diaphragm valve body 52 hermetically separates the valve chamber 20 from the drive space 50 formed in the drive unit 22, and thereby wet fluid flowing through the valve chamber 20. Water such as water vapor enters the drive space 50, and it is effectively prevented that the water adheres to the plunger 28, which is the drive mechanism of the valve body, and freezes, thereby inhibiting the valve function. It is configured.

  In this embodiment, as shown in FIG. 3, the pressure-sensitive portion 51 of the diaphragm valve body 52 is composed of a bent portion bent inward in the radial direction in a sectional view in the axial direction. As described above, the pressure-sensitive portion 51 can also be configured by a bent portion that is bent outward in the radial direction in a cross-sectional view in the axial direction. In this case, the same function and effect as described above can be achieved.

  Furthermore, as shown in FIG. 7A, the pressure-sensitive portion 51 of the diaphragm valve body 52 may have a bent portion around the entire circumference in a cross-sectional view in the radial direction. As shown in B), the pressure-sensitive portion 51 of the diaphragm valve body 52 is bent in a bellows shape in a radial cross-sectional view, that is, bent in a part of the entire circumference in a radial cross-sectional view. It can also comprise so that it may have a part.

  With this configuration, even when the internal pressure on the drive unit 22 side changes or when the pressure on the valve chamber 20 side changes, the pressure sensing unit 51 of the diaphragm valve body 52 is formed in a bellows shape. These pressure changes can be suppressed by the bending portion expanding and contracting in the radial direction in a cross-sectional view in the radial direction.

  As a result, the diaphragm valve body 52, which is a separation membrane member, does not affect the movement of the valve body portion 56 in the direction of separating from and contacting the valve seat 18, and the change in pressure affects the operating characteristics of the valve. It is possible to suppress.

  The water adhering to the pressure sensing part 51 of the diaphragm valve body 52 may be blown off by, for example, stopping the fuel cell system and purging inert gas such as nitrogen gas.

  FIG. 8 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention, FIG. 9 is a partially enlarged view for explaining a state when the control valve of FIG. 8 is opened, and FIG. FIG. 11 is a partially enlarged view for explaining the state when the control valve of FIG. 8 is closed, and FIG. 11 is a partially enlarged view for explaining the case where the internal pressure on the drive unit side is increased in the state of the control valve of FIG. FIG. 12 and FIG. 12 are partial enlarged views for explaining a case where the internal pressure on the drive unit side is lowered while the control valve of FIG. 8 is closed.

  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 5, and the same reference numerals are given to the same components. Detailed description thereof will be omitted.

In the control valve 10 of this embodiment, as shown in FIGS. 8 to 12, the pressure-sensitive portion 51 of the diaphragm valve body 52 is configured by a bent portion formed in a bellows shape in an axial sectional view. Yes.
In the control valve 10 of this embodiment, when the electromagnetic coil 46 is energized, the valve body portion 56 of the diaphragm valve body 52 attached to the lower end of the valve rod member 36 is separated from the valve seat 18, so that the valve seat 18. When the valve port 16 formed in the valve is opened, as shown by the arrow in FIG. 9, when the valve body portion 56 moves away from the valve seat 18, the bellows-like shape of the diaphragm valve body 52 is formed. The pressure-sensitive part 51 formed in this manner is contracted in the axial direction and follows, so that the displacement of the valve body part 56 is not hindered.

  On the other hand, as shown in FIG. 10, by stopping energization of the electromagnetic coil 46, the valve body portion 56 of the diaphragm valve body 52 attached to the lower end of the valve stem member 36 comes into contact with the valve seat 18. In the state where the valve port 16 formed in the valve seat 18 is closed, also in the control valve 10 of this embodiment, the separation membrane portion 54 of the diaphragm valve body 52 has a flat plane as in the first embodiment. Since it is in contact with the lower surface of the fixed member 60, the separation membrane portion 54 of the diaphragm valve body 52 is not displaced even when pressure is applied from the valve chamber 20 side.

  In addition, the separation membrane portion 54 of the diaphragm valve body 52 is also in contact with the lower surface of the fixing member 60 having a flat plane against the pressure change on the drive portion 22 side. Does not flow in, and the separation membrane portion 54 of the diaphragm valve body 52 has no pressure receiving surface. For this reason, the separation membrane part 54 of the diaphragm valve body 52 is not displaced even if it receives pressure from the drive part 22 side.

  In the control valve 10 of this embodiment, a bellows-like shape that can expand and contract in the radial direction between the separation membrane portion 54 of the diaphragm valve body 52 and the valve body portion 56 due to a pressure change on the drive unit 22 or the valve chamber 20 side. 11 is formed, when the pressure on the drive unit 22 side increases (when the pressure on the valve chamber 20 side decreases), as shown by the arrow in FIG. The part 51 swells outward in the radial direction.

  On the contrary, when the pressure on the drive unit 22 side decreases (when the pressure on the valve chamber 20 side increases), as shown by the arrow in FIG. It will shrink inward.

  With this configuration, even when the internal pressure on the drive unit 22 side changes or when the pressure on the valve chamber 20 side changes, the bent portion formed in the bellows shape of the pressure sensitive unit 51 is These pressure changes can be suppressed by expanding and contracting in the radial direction in the sectional view of the direction.

  As a result, the diaphragm valve body 52, which is a separation membrane member, does not affect the movement of the valve body portion 56 in the direction of separating and contacting the valve seat 18, and the pressure on the drive portion 22 side and the valve chamber 20 side is not affected. It is possible to suppress the influence on the operating characteristics of the valve due to the change.

  In addition, since the bent portion formed in the bellows shape of the pressure-sensitive portion 51 expands and contracts in the axial direction with respect to the movement of the valve body in the direction away from and contacting the valve seat, the valve body portion 56 is driven. Since the deformation of the pressure sensitive part 51 follows, the displacement of the valve body is not hindered.

  In this case, the number and size of the bellows of the bellows-shaped bent portion of the pressure-sensitive portion 51 are not particularly limited, and as shown in FIGS. However, as shown in FIGS. 13 (A) and 13 (B), the bellows-like pressure-sensitive portion 51 has a bent portion, the central portion of the bellows 51a has the bellows 51b at both ends, The unevenness distance in the radial direction may be smaller than that in 51c in the sectional view in the axial direction.

  That is, the bent portion of the bellows-like pressure-sensitive portion 51 is such that the concave-convex distance L1 of the central bellows 51a is larger than the radial concave-convex distance L2 of the bellows 51b, 51c at both ends. If the inner pressure on the drive unit 22 side changes or the pressure on the valve chamber 20 side changes, the bellows 51a in the central portion easily expands and contracts in the radial direction. Change can be suppressed.

  Also in the control valve 10 of this embodiment, as in the first embodiment, as shown in FIG. 7B, the pressure-sensitive portion 51 of the diaphragm valve body 52 has an accordion-like shape in a cross-sectional view in the radial direction. In other words, the bent portion may be formed in a part of the entire circumference in a radial cross-sectional view.

  With this configuration, even when the internal pressure on the drive unit 22 side changes or when the pressure on the valve chamber 20 side changes, the bent portion formed in the bellows shape of the pressure sensitive unit 51 has a radius. These pressure changes can be suppressed by expanding and contracting in the radial direction in the sectional view of the direction.

  As a result, the diaphragm valve body 52, which is a separation membrane member, does not affect the movement of the valve body portion 56 in the direction of separating and contacting the valve seat 18, and the pressure on the drive portion 22 side and the valve chamber 20 side is not affected. It is possible to suppress the influence on the operating characteristics of the valve due to the change.

  FIG. 14 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention, and FIG. 15 is a partially enlarged sectional view of the control valve of FIG.

  The control valve 10 of this embodiment has basically the same configuration as the control valve 10 of the first embodiment shown in FIGS. 1 to 7, and the same reference numerals are given to the same components. Detailed description thereof will be omitted.

  In the control valve 10 of the first embodiment shown in FIGS. 1 to 7, as shown in FIGS. 1 and 2, the diaphragm valve body 52 constituting the separation membrane member includes a separation membrane portion 54 and a pressure sensitive portion 51. However, in the control valve 10 of this embodiment, the diaphragm 55 does not include the valve body 56 as shown in FIGS. 14 to 15.

  Further, in the control valve 10 of this embodiment, the lower end 53 of the pressure sensing portion 51 of the diaphragm 55 constituting the separation membrane member is fixed to the proximal end portion 38a of the valve body portion 38 constituting the valve body of the valve rod member 36. Has been.

  By configuring in this way, the same effect as the control valve 10 of the first embodiment shown in FIGS. 1 to 7 is obtained, and the lower end 53 of the pressure-sensitive portion 51 of the diaphragm 55 constituting the separation membrane member is Since the base end portion 38a of the valve body portion 38 constituting the valve body of the valve stem member 36 is fixed, the shape of the diaphragm 55 constituting the separation membrane member can be simplified, and the cost can be reduced.

In this case, the method for fixing the lower end 53 of the pressure-sensitive portion 51 of the diaphragm 55 to the proximal end portion 38a of the valve body portion 38 of the valve rod member 36 is not particularly limited. For example, adhesion, welding, It may be fixed by caulking or the like.

  16 is a longitudinal sectional view schematically showing an electromagnetic valve of a control valve according to another embodiment of the present invention, FIG. 17 is a partially enlarged view for explaining a state when the control valve of FIG. 16 is opened, and FIG. FIG. 19 is a partially enlarged view for explaining a state when the control valve of FIG. 16 is closed. FIG. 19 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is increased in the state of the control valve of FIG. 20 is a partially enlarged view for explaining a case where the internal pressure on the drive unit side is lowered while the control valve of FIG. 16 is closed.

  The control valve 10 of this embodiment has basically the same configuration as the control valve 10 of the second embodiment shown in FIGS. 8 to 12, and the same reference numerals are given to the same components. Detailed description thereof will be omitted.

  In the control valve 10 of the second embodiment shown in FIGS. 8 to 12, as shown in FIGS. 8 and 9, the diaphragm valve body 52 constituting the separation membrane member includes a separation membrane portion 54 and a pressure sensitive portion 51. In the control valve 10 of this embodiment, the diaphragm 55 does not include the valve body 56 as shown in FIGS. 16 to 20.

  Further, in the control valve 10 of this embodiment, the lower end 53 of the pressure-sensitive portion 51 of the diaphragm 55 constituting the separation membrane member is connected to the valve rod, similarly to the control valve 10 of the third embodiment shown in FIGS. It is fixed to the base end portion 38a of the valve body portion 38 constituting the valve body of the member 36.

  By having such a configuration, the same effect as the control valve 10 of the second embodiment shown in FIGS. 8 to 12 is obtained, and the lower end 53 of the pressure-sensitive portion 51 of the diaphragm 55 constituting the separation membrane member is Since the base end portion 38a of the valve body portion 38 constituting the valve body of the valve stem member 36 is fixed, the shape of the diaphragm 55 constituting the separation membrane member can be simplified, and the cost can be 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 11 Upper main body 12 Valve main body 13 Lower main body 14 1st port 15 2nd port 16 Valve port 18 Valve seat 20 Valve chamber 22 Drive part 26 Plunger tube 28 Plunger 30 Suction element 32 Plunger spring 34 Insert Metal fitting 36 Valve stem member 38 Valve body portion 38a Base end portion 40 Fastening screw 42 Nut 44 Outer box member 46 Electromagnetic coil 48 Mold resin 50 Drive space 51 Pressure sensing portion 51a Bellows 51b, 51c Bellows 52 Diaphragm valve body 53 Lower end 54 Separation membrane Part 55 Diaphragm 56 Valve body part 58 Fixing part 60 Fixing member 100 Solenoid valve 102 Valve body 104 Inlet port 105 Outlet port 106 Valve port 108 Valve seat 110 Valve chamber 112 Drive part 114 Fastening member 116 Plunger tube 118 Plunger 120 Suction element 122 Plunger spring 124 Concert bracket 126 stem member 130 fastening screws 132 nut 134 outer box making member 136 electromagnetic coil 138 molding resin 140 driving space 142 diaphragm valve element 144 separation membrane unit 146 the valve body 148 fixed portion 150 fixed bracket 152 tapered surface

Claims (10)

A valve chamber with a valve seat having a valve port through which fluid passes;
A drive unit for moving the valve body in a direction of separating and contacting the valve seat;
A drive space formed in the drive unit and hermetically sealed;
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,
A separation membrane member for airtightly separating the valve chamber and the drive space formed in the drive unit is attached to the valve body,
The separation membrane portion of the separation membrane member is in contact with a fixed member having a flat plane,
A control valve characterized in that a pressure-sensitive portion that is elastically expandable and contractable in a radial direction by a change in pressure inside the drive space is formed between the valve body and the separation membrane portion of the separation membrane member.   2. The control valve according to claim 1, wherein the separation membrane member is a separation membrane member in which a separation membrane portion, a pressure sensing portion, and a valve body portion constituting a valve body are integrally formed. .   2. The control valve according to claim 1, wherein the pressure sensitive part of the separation membrane member is fixed to a valve body part constituting a valve body of the valve rod member.   The control valve according to any one of claims 1 to 3, wherein a separation membrane portion of the separation membrane member and a flat plane of the fixing member are fixed to each other.   5. The control according to claim 1, wherein the pressure-sensitive portion of the separation membrane member includes a bent portion that is bent inward or outward in the radial direction in a cross-sectional view in the axial direction. valve.   5. The control valve according to claim 1, wherein the pressure-sensitive portion of the separation membrane member includes a bent portion formed in a bellows shape in a cross-sectional view in the axial direction.   7. The bellows-like bent portion is formed such that the concave and convex distance in the radial direction is smaller in the central portion of the bellows than in the bellows at both ends in the axial cross-sectional view. The control valve described.   The control valve according to any one of claims 1 to 7, wherein the pressure-sensitive portion of the separation membrane member is constituted by a bent portion formed in a bellows shape in a cross-sectional view in the radial direction.   The control valve according to any one of claims 1 to 8, wherein a thickness of the pressure sensitive part of the separation membrane member is formed smaller than a thickness of the separation membrane part.   9. The control valve according to claim 1, wherein the pressure sensitive part of the separation membrane member is made of a material softer than the separation membrane part.

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