JP3259210B2 - Emergency shut-off valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic valve for opening and closing a flow path of a fluid. The present invention relates to an emergency shutoff valve that closes at a valve section to shut off fluid supply. This emergency shutoff valve, for example, when a fire occurs,
When an earthquake occurs or the like, it is used when the flow path of the city gas, the cleaning steam or the like is rapidly cut off to instantaneously and automatically shut off the supply of the fluid.

[0002]

2. Description of the Related Art Conventionally, in an emergency shutoff valve, a valve portion is opened using a magnetic force generated by pressurized air pressure or current as a driving source. In this pneumatic drive, air pressure is normally applied to the valve section, and the air pressure separates the valve section from the valve seat to keep the fluid flow path open, thereby supplying the fluid to a desired portion. Things. On the other hand, in the event of a fire or the like, the air pressure action on the valve portion is eliminated, for example, the valve portion is pressed against the valve seat by the spring force of the spring to close the valve seat, thereby stopping the supply of fluid. .

In the case of a magnetically driven type, a current is always applied to a solenoid coil, a valve portion is separated from a valve seat by a magnetic force generated in the solenoid coil, and the valve seat is held open. In such a case, the energization of the solenoid coil is cut off to eliminate the magnetic force, and the valve portion is pressed against the valve seat by the spring force of the spring to close the valve seat and stop the supply of fluid.

[0004]

Such a conventional emergency shut-off valve has the following problems. An emergency shut-off valve driven by air pressure requires an air pressure source for obtaining a pressurized air pressure, for example, a compressor. Providing this compressor has the following problems.
Particularly in a large building or the like, it is necessary to prepare a large number of emergency shut-off valves. According to this, the compressor becomes large, the equipment cost becomes high, and a space for installation is required. When the compressor is driven, the compressor generates noise and vibration. Particularly when used as a fire extinguisher in a room, the compressor requires a special noise prevention device and a vibration prevention device, and installation of such a prevention device increases the cost. Each emergency shut-off valve requires an air pipe for supplying air pressure, and the pipe work is difficult to separate and easily install.

According to a magnetically driven emergency shut-off valve,
A current is constantly flowing through the coil, which generates heat in the coil. Therefore, sufficient consideration must be given to this heat generation. For example, a member affected by heat is not arranged near the coil. When the diameter of the valve seat increases, it is necessary to increase the spring force of the spring for holding the valve seat in the closed state to increase the valve seat pressing force per unit area. That is, the magnetic force required when the valve portion is opened needs to be increased as the diameter of the valve seat increases. According to this, the coil tends to be large, and has a disadvantage that the opening valve cannot be compactly assembled.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a novel emergency shut-off valve capable of immediately closing a fluid flow path in an emergency without using an air pressure source or a solenoid coil. This is the first purpose. It is a second object of the present invention to provide a compact emergency release valve having a very simple structure.

[0007]

In order to achieve the above-mentioned object, the present invention provides a diaphragm having an opening recessed in a valve body and a cover covering the opening recess. A fluid chamber is formed by the side surface and the opening recess, and a liquid storage chamber is separately formed by the other side surface of the diaphragm and the cover.The fluid chamber has a valve seat connected to the primary side flow path, and a secondary side flow path. In a valve device in which a passage is opened and a valve unit for controlling opening and closing of a valve seat on a diaphragm and an operation rod for manually operating the valve unit are integrally arranged, the operation rod passes through the liquid storage chamber from the valve unit. A coil spring that extends toward the outside of the cover and presses the valve portion toward the valve seat is disposed in the liquid storage chamber around the outer periphery of the operating rod facing the liquid storage chamber, and one end of the coil spring is engaged with the cover. When stopped The other end is engaged with the valve unit to be,
Further, an electrorheological fluid is housed and arranged in the liquid storage chamber, and a first electrode and a second electrode which face at least the outer circumference of the coil spring and face each other are arranged on the inner peripheral wall of the cover facing the liquid storage chamber. , The first electrode and the second electrode
A power source, a valve element position sensing switch that opens a contact when the valve section closes the valve seat and closes the contact when the valve section opens the valve seat, and closes the contact in the normal state, A first feature is that the connection is made in series with an abnormal state detection switch that opens a contact in the state.

According to the present invention, in addition to the first feature, a liquid bypass chamber opened to the atmosphere is provided above the cover, and the liquid bypass chamber and the liquid storage chamber are communicated with each other through a communication passage. This is a second feature.

The present invention has a third feature in that, in addition to the first feature, one end of the coil spring is fixed to the cover, and the other end of the coil spring is fixed to the valve portion.

In addition, the present invention, in addition to the first feature, further comprises an open holding mechanism for elastically positioning and holding the valve portion in a fixed open state when the valve portion opens a valve seat to a fixed position, A fourth feature is that the positioning and holding force of the open holding mechanism with respect to the valve portion is smaller than the spring load of the coil spring.

Further, according to the present invention, a fluid chamber is formed by one side surface of the diaphragm and the opening recess by sandwiching the diaphragm between an opening recess provided in the valve body and a cover covering the opening recess. A liquid storage chamber is separately formed by the other side of the diaphragm and the cover, a valve seat connected to the primary flow path is opened in the fluid chamber, and a secondary flow path is opened, and a valve seat is provided in the diaphragm. In a valve device in which a valve unit for opening and closing control and an operation rod for manually operating the valve unit are integrally arranged, the operation rod extends from the valve unit to the outside of the cover through the liquid storage chamber, and The coil spring that presses the portion toward the valve seat is disposed in the liquid storage chamber so as to surround the outer periphery of the operating rod facing the liquid storage chamber, one end of which is locked by the cover and the other end of which is engaged with the valve portion. Stopped, An electrorheological fluid is housed and arranged in the liquid storage chamber, and a first electrode having a cylindrical shape is arranged inside the coil spring and on the outer periphery of the operating rod facing the liquid storage chamber. An annular second electrode facing at least the first electrode via a spring is disposed on the inner peripheral wall of the cover facing the liquid storage chamber.
And the second electrode are connected in series by a power supply and a valve position sensing switch that opens a contact when the valve unit closes the valve seat and closes the contact when the valve unit opens the valve seat. This is a fifth feature.

Further, the present invention has a sixth feature in that, in addition to the first and fifth features, the abnormal state sensing switch is a temperature sensing switch or a vibration sensing switch.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the emergency shut-off valve according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of the emergency shutoff valve in a valve closed state. FIG. 2 is a longitudinal sectional view of the emergency shutoff valve in a valve open state. FIG. 3 is a cross-sectional view taken along line AA of FIG. Reference numeral 1 denotes a valve body, which is made up of the following. Reference numeral 1A denotes an opening recessed toward the upper end 1B, in which the primary flow path 3 opens through the valve seat 4 and the secondary flow path 5 opens. The primary flow path 3 is connected to, for example, a gas cylinder (not shown) storing LPG gas, and the LPG gas in a pressurized state flows through the primary flow path 3. Also, the secondary flow path 5 is connected to a consuming unit such as a burner (not shown),
LPG gas burns in the burner. The fluid flowing through the primary flow path 3 is not limited to the above, and may be any desired fluid such as city gas, humidifying steam, and pressurizing steam.

Reference numeral 6 denotes a cover disposed on the upper end 1B of the valve body 1. A diaphragm 7 forming a partition is sandwiched between the upper end 1B and the cover 6. Specifically, the cover 6 has a bottom portion 6A at the top, a lower opening recess 6C at the bottom opening through the flange 6B, and a cup-shaped liquid upward from the upper side surface of the bottom portion 6A. The bypass chamber 6D opens. The liquid bypass chamber 6D and the lower opening recess 6C are connected by a communication passage 6E formed in the bottom 6A. According to the above, the fluid chamber 8 is formed by the one side surface 7A of the diaphragm 7 and the opening recess 1A of the valve body 1, and the liquid storage chamber 9 is formed separately by the other side surface 7B of the diaphragm 7 and the lower opening recess 6C of the cover 6. Is done. The primary flow path 3 and the secondary flow path 5 provided with the valve seat 4 open into the fluid chamber 8.

Reference numeral 10 denotes a valve portion formed integrally with the diaphragm 7 to open and close the valve seat 4. An operating rod 11 extends upward from the valve portion 10. More specifically, the operating rod 11 is formed integrally with the valve portion 10 and extends outwardly through the liquid storage chamber 9, the bottom 6A of the cover 6, and the liquid bypass 6D. Reference numeral 12 denotes a protection case that protects the operation rod 11 protruding from the cover 6 and the liquid bypass chamber 6D. Note that the liquid bypass chamber 6D is also protected to the atmospheric pressure state by the protective case 12.

Reference numeral 13 denotes an operating rod 11 facing the inside of the liquid storage chamber 9.
A coil spring is arranged around the outer periphery of A and is contracted and arranged. One end 13A is locked to the bottom 6A of the cover 6, and the other end 13B is locked to the valve portion 10. This coil spring 13 is disposed in the liquid storage chamber 9.

Reference numeral 14 denotes a first electrode, which is a liquid storage chamber 9
Is arranged in an arc shape on one side (the left side in FIG. 1) of the inner peripheral wall 6F of the cover 6 facing the front side. Reference numeral 15 denotes a second electrode, which is arranged in an arc shape on the other side (the right side in FIG. 1) of the inner peripheral wall 6F of the cover 6 facing the liquid storage chamber 9. The first electrode 14 and the second electrode 15 are connected to the coil spring 13
The coil spring 13 is provided with the first electrode 14 and the second electrode 15
And between the opposing surfaces. That is, the coil spring 13 is disposed inside the BB line and the CC line of the first electrode 14 and the second electrode 15. These are best shown in FIG.

Then, the first electrode 14 and the second electrode 15
Are connected in series via a power supply 16, a valve body position detecting switch 17, and an abnormal state detecting switch 18. This is shown in FIG.

The valve position detecting switch 17 is a switch for detecting the open / closed state of the valve section 10 with respect to the valve seat 4.
The contact is opened when the valve section 10 closes the valve seat 4, and the contact is closed when the valve section 10 opens the valve seat 4. In this example, a micro switch is used as the valve body position sensing switch 17 and is attached to the protective case 12. Opening and closing of the contact is performed by the small diameter portion 11B and the large diameter portion 11C of the operating rod 11. It is. That is, in a state where the valve portion 10 closes the valve seat 4, the detection end 17 </ b> A of the microswitch 17 opens a contact corresponding to the small diameter portion 11 </ b> B of the operating rod 11, while a state where the valve portion 10 opens the valve seat 4. The detection end 17A is operated by the large diameter portion 11B of the operating rod 11 to close the contact. The valve position sensing switch 17 is not limited to the above-mentioned micro switch, but may be appropriately selected such as a reed switch.

The abnormal condition detection switch 18 closes a contact in a normal condition and opens a contact in an abnormal condition.
In the case where a temperature sensing switch is used as the abnormal state detecting switch 18, the normal state is a temperature state below a predetermined fixed temperature. The state in which the temperature rises is called an abnormal state, and the contact is opened at a temperature equal to or higher than the predetermined temperature.

When a vibration detecting switch is used as the abnormal state detecting switch 18, the normal state refers to a vibration state equal to or less than a predetermined vibration, and the contact is closed in such a state. On the other hand, a state in which a vibration equal to or more than a predetermined vibration has occurred is referred to as an abnormal state. In this example, a vibration detection switch is used as the abnormal state detection switch 18.
Note that the abnormal state detection switch 18 is not limited to the above, and is appropriately selected according to the purpose of use. For example,
There are a smoke detection switch, an oxygen amount detection switch, and the like.

The liquid storage chamber 9 is filled with an electrorheological fluid R. The electrorheological fluid R is already known from “Functions and Applications of Electrorheological Fluids” published in 1993 (“Powder and Engineering”, Vol. 25, NO3, P50-55). Is obtained by dispersing particles such as carbon particles having electric polarizability in insulating oil such as silicone oil.

When a voltage is applied to the electrorheological fluid R, the viscosity of the electrorheological fluid between the electrodes changes continuously from a liquid state to a solid state according to the applied voltage. .

That is, the electrorheological fluid R is a small-viscosity colloidal solution having fluidity when no voltage is applied. Has an electrorheological effect that increases according to. This is because, when a voltage is applied to the electrorheological fluid R, the particles dispersed in the electrorheological fluid are polarized by the electrolysis generated between the electrodes, and this polarization generates a force for attracting the particles to each other. Are arranged in a rosary, and it is considered that the particle chains obstruct the flow of the fluid and increase the apparent viscosity of the fluid.

The electrorheological fluid R filled in the liquid storage chamber 9 must at least attack the coil spring 13. In the present example, the electrorheological fluid R is filled up to a position near the bottom 6A of the cover 6, whereby the coil spring 13 is constantly immersed in the electrorheological fluid R.

Next, the operation will be described. The first state is an original state of valve closing in which the valve section 10 closes and holds the valve seat 4. The valve position detecting switch 17 disposed in the electric circuit of the first electrode 14 and the second electrode 15 opens a contact, and the abnormal state detecting switch 18 closes the contact. This electric circuit forms an open circuit. . This is the valve position detection switch 1
7, the valve portion 10 closes the valve seat 4 and the operating rod 11
Is at the lowest position, and the valve body position detecting switch 17
The contact is opened because the detection end 17A is disposed corresponding to the small diameter portion 11B of the operating rod 11, while the vibration detection switch (hereinafter simply referred to as the vibration detection switch 18) as the abnormal state detection switch 18 is The contact is closed because there is no abnormal vibration such as an earthquake.

As described above, according to the fact that the electric circuit of the first electrode 14 and the second electrode 15 forms an open circuit, no voltage is applied between the electrodes 14 and 15 and the liquid storage chamber 9 The particles of the electrorheological fluid R stored therein are in a dispersed state, and have the viscosity which the fluid has in its natural state, that is, the smallest viscosity. According to the above, the valve section 10 including the operating rod 11 is
Is pressed downward by the spring force of (1), the valve portion 10 abuts on the valve seat 4, and the primary flow path 3 and the secondary flow path 5 are shut off. Thus, the LPG gas supplied to the primary flow path 3 is not supplied to the secondary flow path 5. This closed state is shown in FIG.

The second state is a valve open state in which the valve section 10 holds the valve seat 4 open. The valve open state is determined by the operation rod 11
By pulling it upward. That is,
When the operating rod 11 is pulled up, the valve section 10 moves upward against the spring force of the coil spring 13 to open the valve seat 4, while the detection end 17 A of the valve body position detecting switch 17 is connected to the operating rod 11. And closes its contact.

According to the above description, the vibration sensing switch 18 whose contacts are closed and held, and the valve body position sensing switch 17 whose contacts are closed by the opening of the valve seat 4 by the valve section 10, make the first switch. The electric circuit of the electrode 14 and the second electrode 15 forms a closed circuit. According to the formation of the above closed circuit, the dispersed particles in the electrorheological fluid R stored between the first electrode 14 and the second electrode 15 facing the liquid storage chamber 9 are polarized. The particles attract each other due to this polarization, and the particles are arranged in a bead shape between the electrodes 14 and 15 to form a particle chain.
Reaches a solid state. In addition, the first electrode 14 and the second
The electrorheological fluid R in the liquid storage chamber 9 other than between the electrodes 15 and 15 has a small viscosity because no voltage is applied by the electrodes 14 and 15.

Then, the coil spring 13 for pressing the valve section 10 against the valve seat 4 is disposed in the electrorheological fluid R in the liquid storage chamber 9. And that the coil spring 13 is disposed between the first electrode 14 and the second electrode 15 facing each other. According to the above, the coil spring 13 is disposed in a state fixed in the electrorheological fluid R in a solid state.

According to the above, the spring force of the coil spring 13 on the valve portion 10 disappears, and the coil spring 13 simply becomes a rigid member. Further, the LPG gas in a pressurized state from the primary side flow path 3 acts on one side surface 7A (lower surface) of the diaphragm 7 and the lower surface of the valve portion 10 to urge the diaphragm 7 and the valve portion 10 upward. I do. Thus, the valve section 10 holds the valve seat 4 in an open state, and thus the LPG gas flowing through the primary flow path 3 is
It can be supplied into the secondary flow path 5 through the valve seat 4 and the fluid chamber 8,
It can be used for combustion by a burner or the like. This valve part 1
The open state of 0 is shown in FIG.

When the operating rod 11 is operated in the upward direction, the volume of the electrorheological fluid in the liquid storage chamber 9 changes in a decreasing direction, and the electrorheological fluid R corresponding to the volume change is used. Is made to flow into the liquid bypass chamber 6D through the communication passage 6E, the operation of the operating rod 11 can be performed smoothly. Further, the electrorheological fluid R corresponding to the volume change may be absorbed by deformation of the diaphragm 7 without providing the liquid bypass chamber 6D in particular.

The third state is to return the valve 10 in the open state to the closed state when an abnormal state occurs. In such a state, the abnormal state detection switch 18
Detects that an abnormality has occurred and opens the contact. The abnormal state in this example is a state in which an earthquake has caused a large vibration due to the occurrence of an earthquake. In such a case, the vibration sensing switch 18 is operated by the vibration to open the contact. According to this, the electric circuit of the first electrode 14 and the second electrode 15 forms an open circuit.

According to the above, since the voltage applied to the electrorheological fluid R in the liquid storage chamber 9 from the first electrode 14 and the second electrode 15 disappears, the particles of the electrorheological fluid R in the liquid storage chamber 9 disappear. Is dispersed and the viscosity of the fluid instantaneously returns to the lowest viscosity.

According to the above, in the second state,
The coil spring 13 disposed in the electrorheological fluid R in a solid state is disposed in the electrorheological fluid R in a low-viscosity liquid state, and the coil spring 13 is an elastic member having a spring force. Return to. According to this, the valve section 10 including the operating rod 11 moves downward by the spring force of the coil spring 13, and the valve section 10 abuts on the valve seat 4 to close the valve seat 4. Thus,
The primary side flow path 3 and the secondary side flow path 5 are shut off by the valve section 10, so that when such an earthquake occurs, the supply of the LPG gas to the burner can be stopped instantaneously, and a fire may occur. The generation or explosion could be suppressed. The state in which the valve section 10 closes the valve seat 4 corresponds to the above-described first state (shown in FIG. 1).

In the above-mentioned emergency shut-off valve, the valve open state mainly uses the pressure of a pressurized fluid (LPG gas in this example) flowing in the primary side flow path 3. The valve open state may be maintained by the following example.

A first example for keeping the valve open will be described with reference to FIG. The same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. One end 13A of the coil spring 13
Is extended horizontally toward the outside and fitted and fixed in a fitting hole 6G formed in the bottom 6A of the cover 6, while the other end 13B of the coil spring 13 extends horizontally toward the inside. It is fitted and fixed in a fitting hole 10A formed in the part 10.

According to the above, similarly to the above-described second state, the coil spring 13 is disposed in the solid state electrorheological fluid R to be a rigid member, and the valve portion 10 is connected to the valve seat 4.
When the valve is opened, one end 13A of the coil spring 13 forming a rigid member is fitted and fixed in the fitting hole 6G of the cover 6, while the other end 13B of the coil spring 13 is fitted into the valve portion 10. The valve portion 10 can be fixedly disposed on the cover 6 via the coil spring 13 which is a rigid member because it is fitted and fixed in the hole 10A. Therefore, in the valve open state, the valve section 10 can be mechanically held in the open state without relying only on the pressure of the pressurized fluid flowing in the primary side flow path 3. The valve can be accurately and stably kept open without being affected by the pressure drop.

A second example for keeping the valve open will be described with reference to FIG. The same components as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. D is an open holding mechanism, and the ball valve 20
The ball valve 20 is backed up by the spring 21 and pressed against the outer periphery of the operating rod 11. Further, the operating rod 11 has an annular locking groove 22.
When the valve portion 10 is separated from the valve seat 4 and the valve portion 10 is opened, the ball valve 20 is pushed into the locking groove 22 by the spring 21 to enter, and the operating rod 11
And a holding force for holding the valve portion 10 including an open state.
Then, the valve portion 1 including the operating rod 11 of the open holding mechanism D
The positioning holding force of 0 is smaller than the spring load of the coil spring 13. That is, in FIG. 6, the horizontal pressing force applied by the ball valve 20 to the operating rod 11 is determined by the spring load in a state where the coil spring 13 is contracted between the bottom 6A of the cover 6 and the valve portion 10. Small.

According to the above description, as in the above-described second state, when the operating rod 11 is pulled upward and the valve section 10 opens the valve seat 4, the coil spring 13 is in a solid state. A rigid member is disposed in the fluid R, and an opening holding mechanism D is provided in the locking groove 22 of the operating rod 11.
The ball valve 20 is pressed by the spring 21 and is arranged to enter. Therefore, in the valve open state, the valve unit 10 can be mechanically held in the open state without relying only on the pressure of the pressurized fluid flowing in the primary side flow path 3, and thus the fluid pressure fluctuation,
Thus, the valve can be accurately and stably kept open without being affected by the pressure drop of the fluid.

When an abnormal state occurs, the electric circuit of the first electrode 14 and the second electrode 15 forms an open circuit, and the coil spring 1 is turned on in the same manner as in the third state.
3 is disposed in the electrorheological fluid R in a low-viscosity liquid state. At this time, the positioning and holding force of the opening and holding mechanism D is smaller than the spring load of the coil spring 13. The valve seat is immediately closed by the spring force of the coil spring 13 and functions as an emergency shutoff valve.

Another embodiment of the emergency shutoff valve according to the present invention will be described with reference to FIGS. Note that the same reference numerals are used for the same structural parts as those in FIG. Reference numeral 30 denotes a cylindrical first electrode which is fitted and arranged via an annular insulating member 31 on the outer periphery of the operating rod 11A facing the inside of the liquid storage chamber 9, and the first electrode 30 is formed of a coil. It is arranged inside the spring 13. Here, the operation rod 11A facing the inside of the liquid storage chamber 9 means the operation rod 11 arranged in the liquid storage chamber 9. A brush 32 made of a conductive material is in contact with the outer periphery of the first electrode 30, and the brush 32 is connected to a power source. Furthermore, the first
Of the operating rod 11 is formed in a cylindrical shape.
And can move synchronously.

The inner peripheral wall 6F of the cover 6 facing the liquid storage chamber 9
, At least an annular second electrode 33 facing the first electrode 30 is arranged.

As described above, the first electrode 30 and the second electrode 33 are arranged to face each other with the coil spring 13 interposed therebetween.
0 and the second electrode 33.

Then, the first electrode 30 and the second electrode 3
3 is a power source 16, a valve element position sensing switch 17 that opens a contact when the valve unit 10 closes the valve seat 4 and closes a contact when the valve unit 10 opens the valve seat 4, and a normal state. It is connected in series with an abnormal condition sensing switch 18 that closes the contact and opens the contact in an abnormal condition.

According to the above-described embodiment of the emergency shut-off valve, the valve section 10 is in the valve open state in which the valve seat 4 is held open.
In the state described above, the following effects are particularly exhibited. That is, in such a valve open state, the first electrode 30 and the second electrode 3
3 is a closed circuit, and according to this, the first cylindrical electrode 3 disposed inside the liquid storage chamber 9 is formed.
The electrorheological fluid R between the zero and the annular second electrode 33 annularly arranged on the inner peripheral wall 6F of the liquid storage chamber 9 is in a solid state by the voltage applied from the electrodes 30 and 33. That is, the electrorheological fluid can be solidified from the outer periphery of the cylindrical first electrode 30 toward the entire inner peripheral wall 6F of the liquid storage chamber 9 in which the annular second electrode is disposed. In the cross section of the liquid storage chamber 9 including the coil spring 13 orthogonal to the longitudinal direction of the operating rod 11,
All the electrorheological fluids R can be brought into a solid state.

According to the above, all the electrorheological fluid R including the coil spring 13 and the outer peripheral portion of the coil spring 13 can be made into a solid state, so that the spring force of the coil spring 13 can be more effectively eliminated. It was done. When the spring force of the coil spring 13 is selected, the outer diameter of the coil spring 13 is changed.
0, there is no need to change the second electrode 33 at all.

[0048]

As described above, the first embodiment of the emergency shut-off valve of the present invention is as follows.
According to the feature, in the valve open state, the spring force of the coil spring that urges the valve portion in the closing direction is converted into a simple rigid member by eliminating the viscosity of the electrorheological fluid by making the viscosity of the electrorheological fluid a solid state In the case of an emergency, the viscosity of the electrorheological fluid is returned from the solid state to a small viscosity in the liquid state, thereby maintaining the open state by the fluid pressure applied from the primary flow path, thereby reducing the spring force of the coil spring. To obtain a valve closed state, so that it is not necessary to specially prepare a driving means such as a compressor. Therefore, the facility cost can be reduced and the degree of freedom of the installation space can be increased. Further, no noise or vibration is generated, and it is particularly suitable for use in equipment and devices that require quietness. Further, a connecting pipe such as an air pipe for connecting the driving means and the valve device is not required, and the installation of the emergency shutoff valve is facilitated. Also, since the magnetic force generated by energizing the coil is not used as its driving means,
There is no heating part at all. Therefore, no consideration is needed for heat generation, and the degree of freedom of installation can be increased.

According to the second feature of the emergency shut-off valve of the present invention, since the liquid storage chamber is connected to the liquid bypass chamber through the communication passage, the liquid storage chamber is moved when the diaphragm including the valve is moved. The change in the chamber volume can be absorbed by the liquid bypass chamber, whereby the dynamic characteristics of the valve section can be further improved.

According to the third feature of the emergency shut-off valve of the present invention, one end of the coil spring is fixed to the cover, and the other end is fixed to the valve portion. Reliability was improved.

According to the fourth feature of the emergency shut-off valve of the present invention, an open holding mechanism for elastically positioning and holding the valve portion in a fixed open state is provided, and the positioning and holding force is smaller than the spring load of the coil spring. Therefore, the reliability of holding the valve open can be improved.

According to a fifth feature of the emergency shut-off valve of the present invention, the cylindrical first electrode is disposed inside the coil spring, and the first electrode is disposed on the outer periphery of the coil spring and on the inner peripheral wall of the liquid storage chamber. Since the annular second electrode is arranged and the coil spring is arranged between the first electrode and the second electrode, the spring force of the coil spring in the valve open state can be more effectively eliminated. , A good valve open state can be obtained.

According to the sixth feature of the emergency shut-off valve of the present invention, since the abnormal condition detecting switch is a temperature detecting switch or a vibration detecting switch, an emergency shut-off valve most suitable for the situation can be provided. .

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of an emergency shutoff valve according to the present invention.

FIG. 2 is a longitudinal sectional view of the emergency shut-off valve of FIG. 1 in an open state.

FIG. 3 is a transverse sectional view taken along line AA of FIG. 1;

FIG. 4 is an electric circuit diagram of a first electrode and a second electrode.

FIG. 5 is a longitudinal sectional view showing another embodiment of the emergency shutoff valve of the present invention.

FIG. 6 is a longitudinal sectional view showing another embodiment of the emergency cutoff valve of the present invention.

FIG. 7 is a longitudinal sectional view showing still another embodiment of the emergency cutoff valve of the present invention.

FIG. 8 is a transverse sectional view taken along line EE of FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve main body 1A Recessed opening 3 Primary flow path 4 Valve seat 5 Secondary flow path 6 Cover 6D Liquid bypass chamber 6E Communication path 7 Diaphragm 7A One side of diaphragm 7B Other side of diaphragm 9 Liquid storage chamber 10 Valve section 11 Operation Rod 11A Operating rod facing liquid storage chamber 13 Coil spring 14 First electrode 15 Second electrode 16 Power supply 17 Valve body position detection switch 18 Abnormal state detection switch D Open holding mechanism R Electrorheological fluid 30 First electrode 33 First 2 electrodes

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16K 31/00-31/02 F16K 17/36-17/38 F16K 7/00-7/20

Claims (6)

(57) [Claims] 1. A fluid chamber is formed by one side surface 7A of a diaphragm 7 and an opening recess 1A by sandwiching a diaphragm 7 between an opening recess 1A provided in the valve body 1 and a cover 6 covering the opening recess. 8, a liquid storage chamber 9 is defined by the other side surface 7B of the diaphragm 7 and the cover 6, and the fluid chamber 8 has a valve seat 4 connected to the primary side flow path 3 and a secondary side flow path. Open Road 5,
The diaphragm 7 has a valve section 10 for controlling the opening and closing of the valve seat 4;
In a valve device in which an operating rod 11 for manually operating the valve section 10 is integrally arranged, the operating rod 11 extends from the valve section 10 to the outside of the cover 6 through the inside of the liquid storage chamber 9,
Coil spring 1 for pressing valve portion 10 toward valve seat 4
3 is disposed in the liquid storage chamber 9 so as to surround the outer periphery of the operating rod 11 facing the liquid storage chamber 9, one end 13 </ b> A of which is locked by the cover 6, and the other end 13 </ b> B is locked by the valve portion 10. Further, an electrorheological fluid R is housed and arranged in the liquid storage chamber 9, and the first electrode facing at least the outer circumference of the coil spring 13 and facing the inner peripheral wall 6 </ b> F of the cover 6 facing the liquid storage chamber 9. 14 and the second electrode 15 are arranged, and the first electrode 14 and the second electrode 15 are connected to the power supply 16 and the contact is opened when the valve section 10 closes the valve seat 4. 10 is characterized in that it is connected in series by a valve body position detecting switch 17 that closes a contact when the valve seat 4 is opened, and an abnormal state detecting switch 18 that closes the contact in a normal state and opens the contact in an abnormal state. Emergency shut-off valve 2. A liquid bypass chamber 6D open to the atmosphere is provided above the cover, and the liquid bypass chamber and the liquid storage chamber 9 are communicated via a communication passage 6E. 1. The emergency shut-off valve according to 1. 3. The coil spring 13 has one end 13A fixed to the cover 6 and the other end 13B of the coil spring 13.
The emergency shut-off valve according to claim 1, wherein the emergency shut-off valve is fixed to the valve portion 10. 4. An opening / holding mechanism D for elastically positioning and holding the valve section 10 in a fixed open state when the valve section opens the valve seat 4 to a fixed position, wherein the valve section of the opening / holding mechanism is provided. 2. A positioning and holding force with respect to the coil spring is smaller than a spring load of the coil spring.
Emergency shut-off valve as described. 5. A fluid chamber is defined by one side surface 7A of the diaphragm 7 and the opening recess 1A by sandwiching the diaphragm 7 between an opening recess 1A recessed in the valve body 1 and a cover 6 covering the opening recess. 8, a liquid storage chamber 9 is defined by the other side surface 7B of the diaphragm 7 and the cover 6, and the fluid chamber 8 has a valve seat 4 connected to the primary side flow path 3 and a secondary side flow path. Open Road 5,
The diaphragm 7 has a valve section 10 for controlling the opening and closing of the valve seat 4;
In a valve device in which an operating rod 11 for manually operating the valve section 10 is integrally arranged, the operating rod 11 extends from the valve section 10 to the outside of the cover 6 through the inside of the liquid storage chamber 9,
Coil spring 1 for pressing valve portion 10 toward valve seat 4
3 is disposed in the liquid storage chamber 9 so as to surround the outer periphery of the operating rod 11 facing the liquid storage chamber 9, one end 13 </ b> A of which is locked by the cover 6, and the other end 13 </ b> B is locked by the valve portion 10. Further, an electrorheological fluid R is accommodated and arranged in the liquid storage chamber 9, and a cylindrical shape is formed on the outer periphery of the operating rod 11 inside the coil spring 13 and facing the liquid storage chamber 9. On the inner peripheral wall 6F of the cover 6 facing the liquid storage chamber 9 while the first electrode 30 is disposed, at least the first electrode 30 is opposed to at least the first electrode 30 via the spring 13 in the form of an annular second electrode.
The first electrode 30 and the second electrode 33 are connected to the power supply 16 when the valve unit 10 closes the valve seat 4, and the valve unit 10 is connected to the first electrode 30 and the second electrode 33. An emergency shut-off valve, which is connected in series by a valve element position detecting switch 17 that closes a contact when the valve is opened, and an abnormal state detecting switch 18 that closes the contact in a normal state and opens the contact in an abnormal state. 6. The emergency shut-off valve according to claim 1, wherein the abnormal state detecting switch is a temperature detecting switch or a vibration detecting switch.