JP2005207271A - Fluid control valve and fuel cell power generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid control valve and a fuel cell power generation system, capable of increasing resolution of opening/closing movement quantity of a valve element in a small flow range by mechanical structure, advantageous to enhance accuracy of opening/closing control of the valve element in the small flow range. <P>SOLUTION: The fluid control valve 1 has a body 2 having a valve port 20, the valve element 3 for adjusting opening quantity of the valve port 20, a drive part 4 held by the body 2, and a mechanical transmission element 5 provided between the drive part 4 and the valve element 3, for transmitting driving force to the valve element 3. In the mechanical transmission element 5, when the value of operation quantity of the valve element 3/operation quantity of the drive part 4 is α, α1 when the opening quantity of the valve port 20 is relatively in the small flow range is set to be smaller than α2 when the opening quantity is relatively in a large flow range. When the drive part 4 operates by the same operation quantity, the opening/closing movement quantity of the valve element 3 in the small flow range is set to be smaller than that in the large flow range. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a fluid control valve having a mechanical transmission element that opens and closes a valve body by transmitting a driving force of a drive unit such as a drive motor to the valve body.

  Conventionally, Patent Document 1 has an electric actuator that controls the amount of air in the intake passage by adjusting the opening of the throttle valve, and a throttle valve opening sensor that detects the opening of the throttle valve. In an electronically controlled throttle valve device for an internal combustion engine that takes in the output of the degree sensor and controls the electric actuator, the minimum opening displacement amount is smaller in the idle opening range where the throttle valve opening is smaller than in the high opening range of the throttle valve. A device for driving an electric actuator is disclosed.

Further, Patent Document 2 has a throttle sensor that detects the throttle opening, an amplification mechanism that amplifies and outputs the operation amount as the operation amount of the throttle grip is smaller, and rotation of an output gear shaft of the amplification mechanism. A throttle control device for a motorcycle having a throttle operation amount sensor for detecting an angle is disclosed. According to this, focusing on the fact that the resolution of the throttle sensor for detecting the throttle opening is not sufficient, the throttle operation amount is greatly amplified in the low throttle operation amount region where the operation amount of the throttle grip is small. The detection accuracy of the valve opening is increased to improve the running feeling.
JP-A-10-169475. JP 2002-256903 A.

  According to the related arts disclosed in Patent Documents 1 and 2 described above, a throttle opening sensor and a throttle sensor are required, and high resolution is achieved in a small flow rate range based on electrical signals detected by the throttle opening sensor and the throttle sensor. Is intended.

  The present invention is a further advancement of the above-described conventional technique, and in a small flow rate range, the opening / closing movement amount of the valve body can be increased by a mechanical structure, and the opening / closing control of the valve body in the small flow rate region is enhanced. It is an object of the present invention to provide a fluid control valve and a fuel cell power generation system that are advantageous in improving accuracy.

A fluid control valve according to aspect 1 includes a body having a valve port, a valve body that adjusts an opening amount of the valve port, a drive unit held by the body, and a drive unit provided between the drive unit and the valve body. A mechanical transmission element that transmits the driving force of
In the mechanical transmission element, when the value of (the amount of movement of the valve body / the amount of movement of the drive unit) is α, α1 when the opening amount of the valve port is a relatively small flow rate range is relatively large. Is set to be smaller than α2 when the flow rate is large,
When the drive unit drives the same amount of operation, the opening / closing movement amount of the valve body in the small flow rate range is set to be relatively smaller than the opening / closing movement amount of the valve body in the large flow rate range. .

  According to the fluid control valve according to aspect 1 described above, when the value of (the amount of operation of the valve body / the amount of operation of the drive unit) is α, α1 when the opening amount of the valve port is a relatively small flow rate region. Is set to be smaller than α2 when the opening amount is relatively large. Therefore, when the drive unit is driven, even if the operation amount of the drive unit is the same, the opening / closing movement amount of the valve body in the small flow rate region is set smaller than the opening / closing movement amount of the valve member in the large flow rate region. . As a result, the opening / closing movement amount of the valve body can be increased in the small flow rate region than in the large flow rate region. Therefore, the opening / closing control of the fluid control valve in the small flow rate region is highly accurate. The small flow rate region and the large flow rate region mean a relative flow rate ratio. Therefore, the small flow rate region means a region where the fluid flow rate is smaller than the large flow rate region, and includes a fully closed state, a substantially fully closed state, and an idling state. The large flow rate region means a region where the fluid flow rate is larger than that of the small flow rate region, and includes a fully opened state. For example, the small flow rate region can be 40% or less or 30% or less when the opening area in the fully open state is 100%. The large flow rate region can be 60% or more or 70% or more when the opening area in the fully open state is 100%.

  According to the fluid control valve according to aspect 1, in the mechanical transmission element, when the driving torque of the valve body is β, the driving torque β1 when the opening amount of the valve port is a relatively small flow rate range is the opening amount. Can be set to be larger than the drive torque β2 in the relatively large flow rate region. For this reason, when the valve body is in the fully closed state, almost fully closed state, or when the opening amount of the valve body is relatively small, the drive torque β of the valve body increases. Therefore, even if the valve body is frozen in the fully closed state or almost fully closed state depending on the usage environment, or when foreign matter is caught in the fully closed or almost fully closed valve body, the valve body is opened. Therefore, it is possible to cope with freezing of the valve body and biting of foreign matter into the valve body. Examples of the drive unit include a drive motor and a fluid pressure cylinder device. Examples of the drive motor include a stepping motor, a DC motor, an AC motor, and an ultrasonic motor. Examples of the DC motor include a sensorless brushless motor and a sensorless brushless motor.

  The fluid control valve according to aspect 1 can be applied to a valve for supplying oxidant gas or fuel gas to a fuel cell in a fuel cell power generation system, or a valve for discharging oxidant offgas or fuel offgas after power generation. it can. Further, the present invention is not limited to these, and it can be used for a valve used in a gas supply system that supplies gas such as air or gas to devices such as an internal combustion engine, an external combustion engine, and a combustor. The fluid control valve means a valve capable of controlling the flow of fluid, and examples thereof include a flow control valve and a pressure reducing valve.

The fluid control valve according to aspect 2 is provided with a body having a valve opening, a valve body that adjusts an opening amount of the valve opening, a drive unit held by the body, and a drive unit provided between the drive unit and the valve body. A mechanical transmission element that transmits the driving force of the part to the valve body,
In the mechanical transmission element, when the driving torque of the valve body is β, the driving torque β1 when the opening amount of the valve opening is a relatively small flow rate region is the driving torque β1 when the opening amount is a relatively large flow rate region. It is characterized by being set larger than the torque β2.

  As described above, the driving torque β1 when the opening amount of the valve opening is in a relatively small flow rate region is set to be larger than the driving torque β2 when the opening amount is in a relatively large flow rate region. For this reason, when the valve body is in the fully closed state, almost fully closed state, or when the opening amount of the valve body is relatively small, the drive torque β of the valve body increases. Therefore, even if the valve body is frozen in the fully closed state or almost fully closed state depending on the usage environment, or when foreign matter is caught in the fully closed or almost fully closed valve body, the valve body is opened. Therefore, it is possible to cope with freezing of the valve body and biting of foreign matter into the valve body.

  According to the fluid control valve according to aspect 3, in addition to the above-described features, the mechanical transmission element has at least one of a link mechanism and a cam mechanism. In this case, the opening / closing movement amount of the valve body can be increased in resolution by a mechanical structure in a small flow rate region than in a large flow rate region.

  According to the fluid control valve according to aspect 4, in addition to the above-described features, the valve body is a swingable butterfly valve. In this case, it is advantageous to make the opening amount of the valve opening variable.

  A fuel cell power generation system according to aspect 5 includes a fuel cell, a fuel supply passage for supplying fuel to the fuel cell, an oxidant supply passage for supplying oxidant to the fuel cell, and an oxidant from an oxidant electrode of the fuel cell. At least one of an oxidant off-gas passage for discharging off-gas, a fuel off-gas passage for discharging fuel off-gas from the fuel electrode of the fuel cell, an oxidant supply passage, a fuel supply passage, an oxidant off-gas passage, and a fuel off-gas passage In the fuel cell power generation system including the provided fluid control valve, the fluid control valve is configured by any one of the above-mentioned claims.

  In this case, when the value of (the amount of movement of the valve body / the amount of movement of the drive unit) is α, α1 when the opening amount of the valve port is a relatively small flow rate range is a relatively large opening amount. When the fluid control valve drive unit is driven by the same operating amount, the opening / closing movement amount of the valve element in the small flow rate range is the opening / closing movement amount of the valve element in the large flow rate range. It is set relatively smaller than. As a result, in the small flow rate region of the fluid control valve, the amount of opening and closing movement of the valve element can be increased. Therefore, the opening / closing control is highly accurate in the small flow rate region of the fluid control valve.

  Further, when the opening amount of the valve opening is set to be relatively larger than the driving torque β2 when the opening amount is relatively small, the driving torque β1 is set to be relatively large. When the valve body is in the fully closed state, almost fully closed state, or when the opening amount of the valve body is small, the driving torque β of the valve body can be increased. Therefore, even when the fluid control valve is used in an environment where the water generated in the fuel cell freezes while remaining, the valve body frozen in the fully closed state or almost fully closed state is opened. It is advantageous to actuate in the direction of movement.

  The fluid control valve can be provided in at least one of the oxidant supply passage, the fuel supply passage, the oxidant offgas passage, and the fuel offgas passage. In particular, the fluid control valve can be provided in the oxidant off-gas passage in order to regulate the pressure of the oxidant electrode of the fuel cell.

  According to the present invention relating to aspect 1, when the value of (the amount of movement of the valve body / the amount of operation of the drive unit) is α, α1 when the opening amount of the valve opening is a relatively small flow rate range is The amount is set smaller than α2 when the flow rate is relatively large. For this reason, when the operation amount of the drive unit is the same, the opening / closing movement amount of the valve body in the small flow rate range is set to be relatively smaller than the opening / closing movement amount of the valve body in the large flow rate range. As a result, the opening / closing movement amount of the valve body can be increased in a smaller flow rate range than in the large flow rate range of the fluid control valve. Therefore, the opening / closing control in the small flow rate region of the fluid control valve can be made highly accurate. As described above, according to the present invention, the amount of opening and closing movement of the valve body can be increased by a mechanical structure in a small flow rate range, which is advantageous for improving the accuracy of the valve body opening and closing control in the small flow rate range. It becomes.

  According to the present invention relating to aspect 2, the driving torque β1 when the opening amount of the valve opening is a relatively small flow rate range is set to be larger than the driving torque β2 when the opening amount is a relatively large flow rate range. Therefore, even if the valve body is frozen in the fully closed state or almost fully closed state, or when foreign matter is caught in the fully closed or almost fully closed valve body, depending on the operating environment, This is advantageous for operating in the direction of opening the body, and can cope with freezing of the valve body and biting of foreign matter into the valve body.

(Embodiment 1)
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, a flow control valve 1 as a fluid control valve according to the present embodiment is a body 2 having a valve port 20 through which a gas as a fluid flows, and a butterfly valve that adjusts the opening amount of the valve port 20. The formed valve body 3, a drive motor 4 as a drive unit held by the body 2, and a machine that is provided between the drive motor 4 and the valve body 3 and transmits the driving force of the drive motor 4 to the valve body 3. And a link mechanism 5 as a mechanical transmission element. The drive motor 4 is a stepping motor.

  As shown in FIG. 1, a motor shaft 40 is rotatably held on the motor mounting portion 22 of the body 2. A valve shaft 30 is rotatably held in the body 2 at the valve opening 20 of the body 2 in a erected state. The motor shaft 40 and the valve shaft 30 are juxtaposed and are parallel to each other.

  As shown in FIG. 1, the link mechanism 5 is disposed on the one surface 5 e side of the body 2. The link mechanism 5 includes a first link 51, a second link 52, and a third link 53. One end 51 a of the first link 51 is connected to the valve shaft 30 and is integrated with the valve shaft 30. One end 53 a of the third link 53 is connected to the motor shaft 40 of the body 2 and is integrated with the motor shaft 40. One end 52 a of the second link 52 is pivotally supported by the other end 51 b of the first link 51, and the other end 52 b of the second link 52 is connected to the other end 51 b of the first link 51. It is pivotally supported. Here, when the drive motor 4 is driven to rotate and the motor shaft 40 rotates a predetermined angle around its axis, the driving force is transmitted to the valve shaft 30 via the third link, the second link, and the first link. Is done. As a result, the valve shaft 30 rotates, and the valve body 3 integral with the valve shaft 30 rotates in the body 2.

  2 and 3 show the operation of the link mechanism 5. When the opening amount of the valve port 20 is a relatively large flow rate region, the link mechanism 5 is set to the form A in FIG. When the opening amount of the valve port 20 is a relatively small flow rate region, the link mechanism 5 is set to the form B in FIG.

  The rotation angle θA of the motor shaft 40 means a traveling angle in which the center line of the third link 53 advances in the arrow A1 direction from an initial position (angle in the form A) inclined 145 degrees with respect to the X axis. The operating angle θB of the valve shaft 30 means a traveling angle that advances in the arrow A2 direction from the initial position of the first link 51 (angle in the form A). When the drive motor 4 is driven and the rotation angle θA of the motor shaft 40 is gradually increased from the initial position to about 120 degrees in the direction of the arrow A1, the operating angle θB of the valve shaft 30 is gradually increased in the direction of the arrow A2. .

  FIG. 4 relates to the flow control valve 1 according to this embodiment, and shows the relationship between the rotation angle θA of the motor shaft 40, the operating angle θB of the valve shaft 30, and the reduction ratio. The characteristics of FIG. 4 are based on calculations. The horizontal axis in FIG. 4 indicates the rotation angle θA of the motor shaft 40. One of the vertical axes in FIG. 4 indicates the operating angle θB of the valve shaft 30. The other of the vertical axis | shafts of FIG. 4 shows a reduction ratio. Here, the reduction ratio means α which is a value of (the operation amount of the valve body 3 / the operation amount of the drive motor 4).

  As shown by the characteristic line in FIG. 4, the operating angle θB and the reduction ratio of the valve shaft 30 are variable based on the rotation angle θA of the motor shaft 40. Here, when the rotation angle θA of the motor shaft 40 is small, it corresponds to a large flow rate range (large output range) of the flow control valve 1. When the rotation angle θA of the motor shaft 40 is large, it corresponds to a small flow rate range of the flow rate control valve 1 (for example, a small output range during idling or the like).

  As shown in FIG. 4, when the rotation angle θA of the motor shaft 40 is gradually increased, the operating angle θB of the valve shaft 30 is gradually increased and the reduction ratio is gradually decreased. Here, in FIG. 4, the inclination of the tangent line of the characteristic line indicating the operating angle θB of the valve shaft 30 will be described. The slope of the tangent when the rotation angle θA of the motor shaft 40 is small (the large flow rate region of the flow control valve 1) is M2. The slope of the tangent when the rotation angle θA of the motor shaft 40 is large (the small flow rate region of the flow control valve 1) is M1. According to the characteristic line of FIG. 4, the inclination M1 is set to be considerably smaller than the inclination M2 (M1 <M2).

  In other words, when the value of the operation amount of the valve body 3 / the operation amount of the drive motor 4 is α, the opening amount of the valve port 20 is relatively small (for example, a small output region during idling). α1 is set to be considerably smaller than α2 when the opening amount is relatively large. As a result, according to the present embodiment, when the drive motor 4 operates, for example, when the drive motor 4 operates by the minimum operation amount thereof, the opening / closing movement amount of the valve body 3 in the small flow rate range is the large flow rate range. Is set to be smaller than the opening / closing movement amount of the valve body 3. As a result, the amount of opening and closing movement of the valve body 3 can be increased in the small flow rate region of the flow control valve 1 (for example, the small output region during idling, etc.) than in the large flow rate region. Therefore, the opening / closing control of the valve body 3 in the small flow rate range is made highly accurate.

  As described above, according to the present embodiment, unlike the above-described Patent Documents 1 and 2, in order to achieve high resolution in a small flow rate range, it can be performed without the need for a throttle opening sensor and a throttle sensor, This is advantageous for electrical failure.

  Furthermore, according to the present embodiment in which the relationship of α1 <α2 is set, when the driving torque of the valve body 3 is β, the driving torque β1 when the opening amount of the valve port 20 is in a relatively small flow rate region. Is set to be larger than the driving torque β2 when the opening amount is relatively large. Therefore, when the valve body 3 is in the fully closed state, almost fully closed state, or in the small flow rate range, the driving torque β of the valve body 3 can be increased compared to the case of the large flow rate range. Therefore, even when the valve body 3 is frozen in the fully closed state substantially in the fully closed state depending on the use environment, or even when foreign matter is caught in the valve body 3 in the fully closed state in the fully closed state, the valve body 3 3 is advantageous for operating in the direction of opening, and is advantageous for the operation of the flow control valve 1 during freezing and the operation of the flow control valve 1 when foreign matter is caught.

(Embodiment 2)
5 and 6 show Embodiment 2 of the present invention. This embodiment has basically the same configuration and function as the first embodiment. In the following, different parts will be mainly described. The parts having common functions are denoted by common reference numerals. According to this embodiment, according to the flow control valve 1B, the cam mechanism 7 is provided as a mechanical transmission element instead of the link mechanism 5. The cam mechanism 7 includes a circular cam body 70 having a profile surface 71 that is integrally connected to the motor shaft 40 in an eccentric manner, an arm-shaped follower 72 that is integrally connected to the valve shaft 30, and a follower. The end 72c of the follower 72, which is interposed between the joint 72 and the seating portion 25 of the body 2, is urged in the arrow W1 direction (tensile direction) to urge the cam body 70 into a contact state. And an urging spring 73. The urging spring 73 is formed of a coil spring. In FIG. 5, the cam body 70 and the arm-shaped follower 72 shown by the solid line indicate the initial position. When the drive motor 4 is rotationally driven and the motor shaft 40 is rotated in the direction of the arrow E1 around its axis, the cam body 70 is rotated about the motor shaft 40 by the driving force, and the follower 72 is the valve shaft. The valve body 3 integrated with the valve shaft 30 is rotated in the same direction.

  FIG. 6 relates to the flow control valve 1B according to the present embodiment, and shows the relationship between the rotation angle θA of the motor shaft 40, the operating angle θB of the valve shaft 30, and the reduction ratio. The characteristics of FIG. 6 are based on calculations. The horizontal axis in FIG. 6 indicates the rotation angle θA of the motor shaft 40. One of the vertical axes in FIG. 6 represents the operating angle θB of the valve shaft 30. The other of the vertical axis | shafts of FIG. 6 shows a reduction ratio. The reduction ratio means α which is a value of (the operation amount of the valve body 3 / the operation amount of the drive motor 4).

  As shown by the characteristic line in FIG. 6, the operating angle θB and the reduction ratio of the valve shaft 30 are variable based on the rotation angle θA of the motor shaft 40. That is, as shown by the characteristic line in FIG. 6, when the rotation angle θA of the motor shaft 40 gradually increases from its initial position, the operating angle θB of the valve shaft 30 gradually increases and the speed reduction ratio gradually decreases.

  In FIG. 6, the inclination of the tangent line of the characteristic line indicating the operating angle θB of the valve shaft 30 is seen. The slope of the tangent when the rotation angle θA of the motor shaft 40 is small (large flow rate region) is M2. The inclination of the tangent line when the rotation angle θA of the motor shaft 40 is large (small flow rate region) is M1. Here, the inclination M1 in the small flow area is set to be considerably smaller than the inclination M2 in the large flow area (M1 <M2).

  In other words, when the value of the operation amount of the valve body 3 / the operation amount of the drive motor 4 is α, α1 when the opening amount of the valve port 20 is a relatively small flow rate range is relatively large. It is set to be considerably smaller than α2 in the flow rate range.

  As a result, when the drive motor 4 is driven, for example, when the drive motor 4 is driven by the minimum operation amount thereof, the opening / closing movement amount of the valve body 3 in the small flow rate range is the opening / closing movement amount of the valve body 3 in the large flow rate range. It is set relatively smaller than. As a result, in the small flow rate region of the flow control valve 1, the opening / closing movement amount of the valve body 3 can be increased in resolution compared to the case of the large flow rate region. Therefore, the opening / closing control in the small flow rate region of the flow control valve 1 is made more accurate than in the large flow rate region.

  As described above, according to the present embodiment in which the relationship of α1 <α2 is set, when the drive torque of the valve body 3 is β, the drive when the opening amount of the valve port 20 is in a relatively small flow rate region. The torque β1 is set to be relatively larger than the drive torque β2 when the opening amount is relatively large. Therefore, when the valve body 3 is in the fully closed state or almost fully closed state, the driving torque β of the valve body 3 can be relatively increased as compared with the case where the opening degree of the valve port 20 is large. Therefore, depending on the usage environment of the flow control valve 1, the valve body 3 is frozen in the fully closed state or substantially fully closed state, or when foreign matter is caught in the fully closed or substantially fully closed valve body 3. Even if it exists, it becomes advantageous to operate in the direction which opens the valve body 3.

(Application form)
FIG. 7 shows an application mode applied to a fuel cell power generation system. According to this application mode, the fuel cell power generation system includes a stack 84 assembled by the fuel cell 83 having the fuel electrode 81 and the oxidant electrode 82 sandwiching the solid electrolyte membrane 80, and fuel in the fuel electrode 81 of the fuel cell 83. A fuel supply passage 87 for supplying fuel gas (hydrogen gas or hydrogen-containing gas) from a gas source 85 through a valve 86, and an oxidant gas (generally air) is supplied to an oxidant electrode 82 of the fuel cell 83. An oxidant supply passage 88 for discharging, an oxidant offgas passage 89 for discharging oxidant offgas after power generation from the oxidant electrode 82, a fuel offgas passage 90 for discharging fuel offgas after power generation from the fuel electrode 81, and an oxidation And a flow control valve 1 as a fluid control valve provided in the agent off-gas passage 89.

  The oxidant supply passage 88 is provided with a blowing means 92 such as a fan, a blower, or a compressor, and further, a humidifying section 93 that humidifies the oxidant gas (generally air). The flow control valve 1 is configured by the flow control valve 1 of the first or second embodiment. The oxidant gas supplied from the oxidant supply passage 88 to the oxidant electrode 82 of the fuel cell 83 via the humidifying unit 93 is discharged from the oxidant off-gas passage 89 via the flow control valve 1 after being used for power generation. Is done. At this time, the pressure of the oxidant electrode 82 of the fuel cell 83 can be adjusted by opening and closing the flow control valve 1. Therefore, the flow control valve 1 can function as a pressure regulating valve for the oxidant electrode 82 of the fuel cell 83. In the fuel cell power generation system, water is generated at the oxidant electrode 82 of the fuel cell 83 by a power generation reaction. This water remains in the oxidant off-gas passage 89 and may freeze due to cold. In this case, even when the valve body 3 is frozen in the fully closed state or almost fully closed state, it is advantageous to operate the valve body 3 in the opening direction. This is because, as described above, the drive torque β is increased in the small flow rate region than in the large flow rate region.

(Other examples)
According to the first and second embodiments, the valve body 3 is a butterfly valve. However, the valve body 3 is not limited to this but may be another valve body. According to the application mode described above, the present invention is applied to a valve that supplies an oxidant gas (generally air) to the oxidant electrode 82 of the fuel cell 83 of the fuel cell power generation system. You may apply to the valve | bulb which supplies fuel gas to the fuel electrode 81 of an electric power generation system. Further, according to the above-described application mode, it is applied to the fuel cell power generation system, but is not limited to this, and a gas supply system that supplies gas such as air or gas to devices such as an internal combustion engine, an external combustion engine, and a combustor. It can also be applied to a fluid control valve used in the above. In addition, the present invention is not limited to the embodiments and application modes described above and shown in the drawings, and can be appropriately modified and implemented without departing from the scope of the invention.

  The present invention can be used for a fluid control valve such as a flow control valve used in a fluid path of gas or the like.

FIG. 4 is a perspective view schematically showing a flow control valve according to the first embodiment. It is a block diagram which shows the action | operation form of a link mechanism concerning Embodiment 1. FIG. It is a block diagram which concerns on Embodiment 1 and shows another operation | movement form of a link mechanism. 4 is a graph illustrating a relationship between a rotation angle θA of a motor shaft, an operation angle θB of a valve shaft, and a reduction ratio according to the first embodiment. FIG. 5 is a configuration diagram schematically showing a cam mechanism provided in a flow control valve according to a second embodiment. 6 is a graph illustrating a relationship between a rotation angle θA of a motor shaft, an operation angle θB of a valve shaft, and a reduction ratio according to the second embodiment. It is a conceptual diagram of a fuel cell power generation system according to an application form.

Explanation of symbols

  In the figure, 1 is a flow control valve (fluid control valve), 2 is a body, 20 is a valve port, 3 is a valve body, 30 is a valve shaft, 4 is a drive motor (drive unit), 40 is a motor shaft, and 5 is a link. Mechanism (mechanical transmission element), 51 is a first link, 52 is a second link, 53 is a third link, 7 is a cam mechanism (mechanical transmission element), 70 is a cam body, 72 is a follower, and 73 is attached. A bias spring, 81 is a fuel electrode, 82 is an oxidant electrode, 83 is a fuel cell, 88 is an oxidant supply passage, and 89 is an oxidant off-gas passage.

Claims (5)

A body having a valve port; a valve body for adjusting an opening amount of the valve port; a drive unit held by the body; and a driving force of the drive unit provided between the drive unit and the valve body. A mechanical transmission element that transmits to the valve body,
In the mechanical transmission element, when the value of (the amount of movement of the valve body / the amount of operation of the driving unit) is α, α1 when the opening amount of the valve port is a relatively small flow rate region is The amount is set smaller than α2 when the flow rate is relatively large,
When the drive unit drives the same amount of operation, the opening / closing movement amount of the valve body in the small flow rate range is set to be relatively smaller than the opening / closing movement amount of the valve body in the large flow rate range. Fluid control valve. A body having a valve port; a valve body for adjusting an opening amount of the valve port; a drive unit held by the body; and a driving force of the drive unit provided between the drive unit and the valve body. A mechanical transmission element that transmits to the valve body,
In the mechanical transmission element, when the driving torque of the valve body is β,
The driving torque β1 when the opening amount of the valve opening is in a relatively small flow rate region is set to be larger than the driving torque β2 when the opening amount is in a relatively large flow rate region. valve.   3. The fluid control valve according to claim 1, wherein the mechanical transmission element includes at least one of a link mechanism and a cam mechanism.   4. The fluid control valve according to claim 1, wherein the valve body is a swingable butterfly valve. 5. A fuel cell, a fuel supply passage for supplying fuel to the fuel cell, an oxidant supply passage for supplying oxidant to the fuel cell, and an oxidant off-gas for discharging oxidant off-gas from the oxidant electrode of the fuel cell A fluid provided in at least one of a passage, a fuel off-gas passage for discharging fuel off-gas from the fuel electrode of the fuel cell, and the oxidant supply passage, the fuel supply passage, the oxidant off-gas passage, and the fuel off-gas passage In a fuel cell power generation system comprising a control valve,
5. The fuel cell power generation system according to claim 1, wherein the fluid control valve is configured by any one of claims 1 to 4.

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