JP3426160B2 - Flow control valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow control valve having a novel drive device.

[0002]

2. Description of the Related Art A so-called electromagnetic drive device that supplies a current to a coil to generate a magnetic force and causes the magnetic force to act on a driven member to drive a movable part is used for various purposes. A typical example is a solenoid (electromagnet).

The solenoid has a coil 5 as shown in FIG.
4, an iron core (yoke) 51, a driven body 52, and a return spring (return spring) 53. When a direct current is passed through the coil 54, a magnetic force is generated in the iron core 51, and the driven body 52 made of a magnetic body. Are driven by magnetic attraction. When the direct current of the coil 54 is turned off, the iron core 51
, The driven body 52 returns to its original position by the restoring force of the return spring 53.

The driven body of a normal solenoid is made to stand still in one of two stable positions when current is flowing through the coil, so that the position of the driven body is continuously changed. Although it cannot be controlled, by balancing the magnetic force generated by the iron core and the restoring force of the return spring,
It is also possible to continuously control the position of the driven body within a limited range.

FIG. 13 is an application example of the solenoid capable of continuously controlling the position. The flow rate is adjusted by changing the current value of the coil 54 to change the gap of the flow path of the valve 55 and controlling the flow rate of the fluid passing therethrough. It is a valve.

In the figure, when no current is applied to the coil 54, the valve body 57 of the valve rod 56, which is the driven body, blocks the flow passage by the force of the disc spring (diaphragm) 58, and the flow rate is zero. However, when an electric current is applied to the coil, the coil and the iron core 51
An upward force acts on the valve body 57 by the suction force of the solenoid, and the valve body is displaced upward, the space between the valve seat 59 and the valve body is opened, and the fluid flows. The flow rate at this time increases as the displacement of the valve body increases. On the other hand, when the valve body 57 is displaced upward, the disc spring 58 exerts a downward restoring force on the valve body, and the restoring force increases substantially in proportion to the displacement amount of the valve body.

Therefore, the valve body 57 is stationary at a position where the attraction force of the solenoid and the restoring force of the disc spring 58 are balanced, the displacement of the valve body 57 increases as the current of the coil 54 increases, and the valve seat 59 and the valve body 57 are increased. The flow rate of fluid flowing between them also increases with the current in the coil 54. Therefore, the flow rate can be controlled by adjusting the current of the coil 54.

However, the attraction force of the solenoid is
As shown in FIG. 4, the disc spring is inversely proportional to the square of the distance to the attracted magnetic body (driven body), whereas the restoring force of the disc spring is proportional to the first square of the displacement. The position of the body is limited to a narrow range, and it is difficult to realize a flow rate control valve having a large movable range (stroke) of the valve body.

Generally, in a flow control valve having a small stroke, the pressure loss generated when the fluid flows between the valve seat and the valve body is large, and the pressure (supply pressure) of the fluid flowing into the flow control valve is not sufficiently high. The required flow rate cannot be obtained. Since the pressure loss usually increases in proportion to the square of the flow rate, when the pressure loss reaches the supply pressure, it is physically impossible to obtain a higher flow rate.

This is particularly problematic in the case of a liquid which is less compressible than the case of a gas and which makes it difficult to increase the supply pressure. Most of the practical examples of the flow rate control valve using the solenoid described above are for gas, and very few cases are used for liquid.

A motor type as shown in FIG. 15 is a typical example of means for realizing a flow control valve having a large stroke. In the figure, the screw shaft 60 is rotated by the motor M to move the female screw body 61 up and down, and the lower end valve body 63 of the valve rod 62 integrally provided with the ratchet body is driven up and down to raise and lower the flat plate. It is applied to gate valves and conical needle valves. Further, a rotary drive device is used for a so-called ball valve that rotates a ball having a through hole, and various types of valves have been put into practical use as flow rate control valves in combination with a motor.

Although the motor type can obtain a sufficient stroke, compared to the solenoid type described above, it takes a long time to change the opening degree of the valve, so that there is a problem that the response is slow when used for flow rate control. Generally, the structure is complicated, the cost is high, and the service life is relatively short.

In addition to these, an air-core coil-and-magnet type as shown in FIG. 16 is also used as a flow rate control valve for a small flow rate. In this method, a magnet 6 magnetized in the length direction is provided inside a coil (air-core coil) 64 without an iron core.
The valve rod 66 containing 5 is movably supported in the length direction, and a current is passed through the coil to give a driving force to the magnet.
Is controlled to control the flow rate of the fluid flowing between the valve body 67 and the valve seat 68 by (a) using a coil with a long overall length, the stroke of the magnet can be increased (b) quick response and structure However, it has a number of advantages such as easy position control by combination with a leaf spring because a driving force almost proportional to the current can be obtained.

However, there is a demerit that the current required to obtain the same driving force is much larger than that of the solenoid, and the application is limited to a flow rate control valve for a small flow rate with a small driving force.

Under the above circumstances, especially for liquid flow rate adjustment, a larger stroke can be obtained as compared with the solenoid type, the response is faster than the motor type, the structure is simple and the cost is low, and the air-core coil It is desired to realize a flow control valve that has a larger driving force than the AND-magnet type.

[0016]

The object of the present invention is to provide a large stroke as compared with a solenoid type, a quick response as compared with a motor type, a simple structure and low cost, and an air-core coil and magnet. With a new linear drive that has a larger driving force than the equation, it can be used for a large flow rate, can be used for a large flow rate, has a quick response, can control the flow rate at high speed, and has a small force to drive the valve element. Another object of the present invention is to provide a flow rate control valve which can be strongly obtained with a large electric current, which can contribute to energy saving, and which has a simple structure and can reduce the manufacturing cost.

[0017]

The flow control valve according to the present invention is a first flow control valve which is magnetized on opposite sides of a first electromagnet and a second electromagnet facing each other at a certain interval so that opposing surfaces have different polarities. immobility magnet and second stationary magnets provided, the first, central portion of the second electromagnet and the first, the first valve rod serving driven body an axis portion which passes through the center portion of the second stationary magnets can be moved to the free, a site which corresponds to between the second stationary magnet, first, be it surface facing the second immovable magnet fixed to the driven magnets magnetized such that a pair facing surfaces and homopolar of each stationary magnet respectively, said first 1st and 2nd electromagnetic
When the stone is not supplied with electric current, the driven magnet is
The magnetic repulsive force from the 2 immovable magnet acts and the driven magnet becomes
Although it is held at an intermediate position in the movable range, when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets , the driven magnets are driven by the first and second electromagnets.
The valve rod is moved forward and backward by the required amount in the axial direction together with the driven magnet so that the flow passage area of a part of the flow passage is set by the valve body integrated with the valve rod. is there.

An example of the embodiment is a first immovable magnet which is magnetized inside the both ends of a support having a first electromagnet and a second electromagnet at both ends so that the surfaces facing each other have different polarities. A second stationary magnet is provided, and first and second valve rods, which are driven bodies, are freely inserted through the central portions of the first and second electromagnets and the guide holes in the central portions of the first and second stationary magnets. a site which corresponds to between 2 stationary magnet, first, be it surface facing the second immovable magnet fixed to the driven magnets magnetized so that the opposed surface and the same poles of the stationary magnets, respectively, the first and Current to the second electromagnet
When the magnet is not supplied, the first and second immovable magnets
Magnetic repulsive force from the magnet acts and the driven magnet moves
However, when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets, the magnetic force from the first and second electromagnets is applied to the driven magnet.
By acting, the valve rod is moved forward and backward by the required amount in the axial direction together with the driven magnet , and a part of the flow passage area of the flow passage is set by the valve body integrated with the valve rod.

According to another example of the embodiment, the inflow pipe and the outflow pipe are connected to both ends of the valve box, and the first pipe is provided around the inflow pipe.
The electromagnet and the first immovable magnet, the second electromagnet and the second immovable magnet around the outflow pipe , respectively of the first and second immovable magnets.
Provided so that the surfaces facing each other have different polarities, and in the valve box,
The first, the opposing surfaces and the second stationary magnets respectively not
A driven magnet magnetized so as to have the same pole as the facing surface of the moving magnet is provided, and no current is supplied to the first and second electromagnets.
When it is not, the magnets from the first and second stationary magnets are applied to the driven magnet.
Repulsive force acts to keep the driven magnet in the middle position of the movable range.
Holds, but when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets, they are driven.
The magnetic force from the first and second electromagnets acts on the magnet to move the valve body forward and backward by a required amount in the axial direction of the inflow pipe / outflow pipe, and the flow passage area of a part of the flow passage by the valve body. Is set.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The flow control valve of the present invention will be described below with reference to the embodiments shown in FIGS. In FIG. 1, reference numeral 9 indicates a linear drive device that is a drive portion of the flow rate control valve according to the present invention. The drive device is provided with the upper and lower flanges 1a and 1b of a tubular support body 1 having flanges 1a and 1b at both upper and lower ends.
A pair of upper and lower first electromagnets 4A and 4B having coils 2A and 2B are provided around air-core yokes (iron cores) 3A and 3B having vertical guide holes 3a and 3b respectively at the centers.

Inside the upper and lower end portions of the support body 1, vertical guide holes 5a and 5b, which coincide with the vertical guide holes 3a and 3b of the air-core yoke, are provided in the center, respectively, and are arranged in the axial direction passing through the vertical guide holes. A pair of upper and lower magnetized first stationary magnets 5A and second stationary magnets 5B are fixed so that the different poles face each other.

Then, the valve rod 6 as a driven body is freely inserted into the guide holes of the upper and lower electromagnet yokes and the guide holes of the upper and lower first and second immovable magnets, and the valve rod 6 has the upper and lower first magnets. , The driven magnet 5C is fixed between the second stationary magnets, and the driven magnet 5C is located above and below the first and the second stationary magnets.
The upper and lower first and second immovable magnets are magnetized so that the same poles face each other so as to repel each other and are fixed to the valve stem, and the driven magnet 5C is located between the upper and lower first and second immovable magnets. It is designed to be held at a site near the midpoint.

As shown in FIG. 3, direct current power supplies 7A and 7B capable of switching between forward and reverse are connected to the respective coils of the first and second electromagnets of the driving device constructed as described above to generate an appropriate current. By supplying, the valve rod 6 as a driven body can be operated as follows.

First, when no current is applied, the repulsive force from the first and second stationary magnets 5A and 5B acts on the driven magnet 5C, and the driven magnet 5C is in the middle of the movable range as shown in FIG. Held in position.

Next, the coil 2A of one of the first electromagnets 4A
When a current that generates a magnetic force that repels the driven magnet 5C and a current that generates a magnetic force that attracts the driven magnet 5C of the other second electromagnet 4B are simultaneously supplied, a downward force is applied to the driven magnet 5C. The driven magnet 5C works to overcome the repulsive force of the second stationary magnet 5B, and the driven magnet 5C moves below the movable range as shown in FIG.

Since the repulsive force of the second stationary magnet 5B at this time becomes larger as the driven magnet 5C moves downward,
By adjusting the magnitudes of the currents of the two coils 2A and 2B, the amount by which the driven magnet 5C moves downward can be adjusted. Since the above operation is due to the repulsion and attraction of the magnet, the response speed is as high as that of the solenoid.

By reversing the direction of the current, a magnetic force that attracts the driven magnet 5C is generated in the coil 2A of the first electromagnet 4A, and a magnetic force that repels the driven magnet 5C is generated in the coil 2B of the second electromagnet 4B. Then, an upward force acts on the driven magnet 5C, overcoming the repulsive force of the first stationary magnet 5A, and the driven magnet 5C moves above the movable range as shown in FIG. Also in this case, the amount of the driven magnet 5C moving upward can be adjusted by adjusting the magnitude of the current.

In order to generate the opposite magnetic forces in the first and second electromagnets as described above, two power supplies may be used and currents may be independently supplied to the electromagnets 4A and 4B. As in 5, coils 2A, 2B of electromagnets 4A, 4B
It is also possible to connect in series so that the magnetic forces are opposite to each other, and to perform the above-mentioned operation with a single power supply 7 having a changeover switch 8.

However, in this case, the cost is low, but the strengths of the currents flowing through the two coils are always the same, and it is not possible to flow currents having different strengths to the respective coils. There are many restrictions in performing various controls.

The attraction force acting between the driven magnet 5C and the electromagnet yoke causes the driven magnet 5C and the stationary magnets 5A and 5A,
In order to prevent B from coming into close contact, a stationary magnet that generates a repulsive force larger than this attractive force is used.

FIG. 6 shows an example of the experimental data of the above driving device. A driven magnet having a diameter of 40 mm and a thickness of 6 mm is used.
Maximum driving force 2kg or more (current 1.5A), stroke 7m
A performance of m or more is obtained.

As shown in the experimental data, if the driving device is one that can generate a sufficiently large magnetic force to the electromagnets 4A and 4B, a sufficient amount of movement and a large driving force are given to the driven body in the above operation. It is possible.

The flow control valve of the present invention is equipped with the above-mentioned drive device. In FIG. 1, reference numeral 10 indicates a valve box of the flow control valve, 11 indicates a valve box cover, and the linear drive device 9 is fixed on the valve box cover 11. The valve box 10 is formed with a fluid inflow pipe 12a and a fluid outflow pipe 12b, and the inflow pipe and the outflow pipe are connected by a port 13,
A valve seat 14 is formed at the port.

However, the rod body as the driven body of the linear drive device 9, that is, the valve rod 6 penetrates the hole 15 of the upper lid of the valve box cover, and the lower tapered valve body 16 faces the valve seat 14.
The flow area is controlled by setting and controlling the flow passage area (opening) of a part of the flow passage from the inflow pipe to the outflow pipe by the degree of insertion (fitting degree) of the valve body into the valve seat. Reference numeral 17 is a bellows that closes the upper opening of the port. The lower part is fixed to the upper lid of the valve box 10 and the upper part is fixed to the valve rod 6 penetrating it.

The first and second drive devices 9 for the flow rate control valve
3 or 4 or the power source 7 with a changeover switch 8 as shown in FIG. 5 is connected to the electromagnet of FIG. 3 and the current supply to the first and second electromagnets is adjusted to control the driven magnet of the valve rod. 5C is given a moving force in the vertical direction by the magnetic force, and the valve body 1
The flow rate can be adjusted by setting the degree of insertion of the valve 6 into the valve seat 14.

The flow rate control valve can be an automatic flow rate control device by means of a flow meter 18 and a control unit 19 as shown in FIG. That is, in the flow path of the flow control valve,
A flow meter 18 that continuously outputs an electrical flow signal is provided, and the amount of fluid passing through the flow rate control valve can be known from the actually measured flow signal from this flow meter.

Further, the control unit 19 controls the measured flow rate signal Q from the flow meter and the set flow rate signal P input from the outside.
Is read, and a control signal is sent to the DC power supplies 7A and 7B to the first and second electromagnets so that they match each other, and the flow control valve is controlled.

That is, the flow rate signal of the flowmeter is set to Qcc / min.
When the set flow rate signal is Pcc / min, when Q> P, a current that generates a magnetic force that repels the driven magnet 5C of the coil 2A of the first electromagnet 4A and the driven magnet 5C of the coil 2B of the second electromagnet 4B is generated. By simultaneously supplying currents that generate magnetic forces that attract each other, a downward force is applied to the driven magnet 5C, the valve body 16 is moved downward, and Q is reduced.

When Q <P, the first and second electromagnets 4
The directions of the electric currents supplied to A and 4B are opposite to each other, an upward force is applied to the driven magnet 5C, the valve body 16 is moved upward, and Q is increased.

At this time, the strength of the force applied to the driven magnet 5C can be adjusted by the strength of the current supplied to the two electromagnets 4A and 4B. Therefore, by selecting the optimum current value according to the difference between Q and P, it is possible to quickly And Q can be matched to P.

Since there are various types of flow rate control valves other than those shown in FIG. 1, an example thereof will be described with reference to FIGS.

FIG. 7 shows a double-port type flow control valve having two ports 22a and 22b in a valve box 21 having an inflow pipe 20a and an outflow pipe 20b, and therefore corresponds to the valve seats 23a and 23b of the respective ports. Two valve bodies 24a,
24b is provided on one valve rod 25.

The valve box 21 is provided with the above-described linear drive device 9, and the drive device 9 operates the valve rod 25 in the axial direction (vertical direction in the figure), so that the valve seat and the valve body are moved. The clearance is regulated and the flow rate is adjusted. This type of flow control valve has a valve body 24 in which the pressure difference generated in the flow path is two.
Since the a and 24b act in opposite directions to each other, there is an advantage that a small force is required to open the valve.

FIG. 8 shows a diaphragm type flow rate control valve in which the inflow pipe 20a and the outflow pipe 20b are orthogonal to each other. The valve body 24 of the valve rod 25 is attached to the diaphragm 26, and the valve box 2
1 is provided with the above-described linear drive device 9, which linearly moves (vertically moves in the figure) the valve rod 25 so that the gap between the valve seat 23 and the valve body 24 at the inner end of the inflow pipe 20a is reduced. The flow rate of the flow path is regulated and regulated.

FIG. 9 shows a diaphragm type flow rate control valve in which the inflow pipe 20a and the outflow pipe 20b are on the same straight line. The valve body 24 of the valve rod 25 is attached to the diaphragm 26, and the valve box 21 has the above-mentioned structure. A linear drive device 9 is provided, and the valve rod 25 moves linearly by the device (moves up and down in the figure).
As a result, the gap between the valve seat 23 and the valve body 24 is regulated, and the flow rate of the flow path is adjusted.

FIG. 10 shows a gate valve for adjusting the flow rate by vertically moving the valve body 24 at the tip (lower end in the figure) of the valve rod 25. The above-mentioned linear drive device 9 is provided above the flow passage pipe 20, The valve rod 25 is actuated by the same device, and the flow passage area of a part of the flow passage from the inflow pipe to the outflow pipe is defined by the valve body 24.

FIG. 11 shows a type in which a first electromagnet and a first stationary magnet, a second electromagnet and a second stationary magnet are provided so as to sandwich the valve box from above and below. The inflow pipe 20a is connected to the lower surface of the valve box 21, the outflow pipe 20b is connected to the upper surface of the valve box 21, and the first electromagnet 4A composed of the coil 2A and the iron core 3A and the first immovable member are arranged around the inflow tube 20a. The magnet 5A is provided around the outflow pipe 20b with a second electromagnet 4B including a coil 2B and an iron core 3B and a second stationary magnet 5B having a different pole from the first stationary magnet.

However, there is one valve rod 25 passing through the inflow pipe, the valve box and the outflow pipe, and the poles on the surfaces facing the upper and lower first and second stationary magnets are the same in the valve box 21. A driven magnet 5C magnetized to be a pole is fixedly provided on the valve rod, and a valve body 24 corresponding to the upper valve seat 23 of the inflow pipe is provided at the lower end of the valve rod. Further, the outflow pipe 2 is provided on the upper side of the valve rod.
A guide 27 is provided that contacts the inner wall of 0b. The means for supplying the current is the same as that shown in FIGS.

Reference numeral 28 in FIGS. 7 and 10 indicates a seal body, and reference numeral 29 in FIG. 11 indicates a shield cover for the driven magnet, both of which are made of chemical resistant synthetic resin or metal. .

[0050]

As described above, in the flow control valve of the present invention, the valve rod can obtain a large moving range (stroke) and a large driving force, and the driving force proportional to the current is generated almost instantly. .

Therefore, the control range of the flow rate is large, it can be used for a large flow rate, the response is fast, the flow rate can be controlled at high speed, and the driving force of the valve element can be strongly obtained with a small current. Therefore, there are advantages that it can contribute to energy saving, that the structure is simple and that the manufacturing cost can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of a flow rate control valve according to the present invention.

FIG. 2 is a vertical cross-sectional view showing an example of a linear drive device that is a drive unit of the flow rate control valve of the present invention.

FIG. 3 is a vertical cross-sectional view showing an example of an operating state of the linear drive device.

FIG. 4 is a vertical cross-sectional view showing another example of the operating state of the linear drive device.

FIG. 5 is a vertical cross-sectional view showing another example of the linear drive device.

FIG. 6 is a diagram showing the relationship between the current supplied to the electromagnet and the driving force and displacement of the driven magnet.

FIG. 7 is a vertical cross-sectional view showing another example of the flow rate control valve according to the present invention.

FIG. 8 is a vertical cross-sectional view showing still another example of the flow rate control valve according to the present invention.

FIG. 9 is a vertical sectional view showing still another example of the flow rate control valve according to the present invention.

FIG. 10 is a vertical cross-sectional view showing still another example of the flow rate control valve according to the present invention.

FIG. 11 shows still another example of the flow rate control valve according to the present invention, (a) is a vertical sectional view, and (b) is an enlarged transverse sectional view of the outflow pipe portion.

FIG. 12 is a vertical cross-sectional view showing a conventional drive device for a flow rate control valve.

FIG. 13 is a vertical cross-sectional view of a conventional flow rate control valve.

FIG. 14 is a diagram showing the relationship between the supply current to the electromagnet and the displacement and force of the driven body, and the relationship between the displacement of the disc spring and the restoring force.

FIG. 15 is a vertical cross-sectional view showing a conventional drive device for a gate valve.

FIG. 16 is a vertical cross-sectional view of a conventional flow rate control valve.

[Explanation of symbols]

1 ... Support 1a, 1b ... flange 2A, 2B ... Coil 3A, 3B: Empty core yoke (iron core) 3a, 3b ... Vertical guide holes 4A ... first electromagnet 4B: second electromagnet 5A: first stationary magnet 5B: second stationary magnet 5C: driven magnet 6 ... Valve rod 7A, 7B ... DC power supply 8 ... Changeover switch 9: Linear drive 10 ... Valve box 11 ... Valve box cover 12a ... inflow pipe 12b ... Outflow pipe 13 ... Port 14 ... Benza 15 ... Valve box cover hole 16 ... Valve 17 ... Bellows 18 ... Flowmeter 19 ... Control unit 20a ... inflow pipe 20b ... Outflow pipe 21 ... Valve box 22a, 22b ... Port 23 ... Benza 23a, 23b ... Benza 24 ... Valve 24a, 24b ... Valve 25 ... Valve rod 26 ... Diaphragm 27 ... Guide 28 ... Seal 29 ... Shield cover

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-57-177510 (JP, A) JP-A-8-138932 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01F 7/16

Claims (3)

(57) [Claims] 1. A first non-moving magnet and a second non-moving magnet, which are magnetized so that opposing surfaces have different polarities , on opposite sides of a first electromagnet and a second electromagnet facing each other at a certain interval, the first, central portion of the second electromagnet and the first, the first, site hits between the second stationary magnet valve rod serving driven body an axis portion which passes through the center portion of the second stationary magnets can be moved to the free, third 1, it secures the second driven magnet that faces surface stationary magnet is magnetized so that respectively opposing surfaces of the stationary magnet and <br/> same polarity, before
Note When no current is supplied to the first and second electromagnets
Is the magnetic repulsive force from the first and second stationary magnets on the driven magnet.
Acts to hold the driven magnet in the middle position of the movable range.
However, when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets , the driven magnet is first
The valve rod is driven by the magnetic force from the first and second electromagnets.
A flow control valve that is moved in the axial direction together with a magnet by a required amount in the reverse direction so that the flow passage area of a part of the flow passage is set by a valve body that is integral with a valve rod. 2. A first immovable magnet and a second immovable magnet, which are magnetized so that surfaces facing each other have different polarities, inside a support having a first electromagnet and a second electromagnet at both ends. , A portion of the valve rod, which is a driven body, freely inserted through the guide holes in the central portions of the first and second electromagnets and the central portions of the first and second immovable magnets, the portion corresponding to the first and second immovable magnets. 1, it secures the second driven magnet that faces surface stationary magnet is magnetized so that respectively opposing surfaces of the stationary magnet and <br/> same polarity, before
Note When no current is supplied to the first and second electromagnets
Is the magnetic repulsive force from the first and second stationary magnets on the driven magnet.
Acts to hold the driven magnet in the middle position of the movable range.
However, when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets , the driven magnet is first
The valve rod is driven by the magnetic force from the first and second electromagnets.
A flow control valve that is moved in the axial direction together with a magnet by a required amount in the reverse direction so that the flow passage area of a part of the flow passage is set by a valve body that is integral with a valve rod. 3. An inflow pipe and an outflow pipe are connected to both ends of the valve box, and a first electromagnet and a first stationary magnet are provided around the inflow pipe, and a second electromagnet and a second stationary magnet are provided around the outflow pipe. ,Each
The surfaces of the first and second stationary magnets facing each other have different polarities.
And a driven magnet magnetized so that the surfaces facing the first and second stationary magnets have the same poles as the facing surfaces of the stationary magnets, respectively . 2 electromagnetic
When the stone is not supplied with electric current, the driven magnet is
The magnetic repulsive force from the 2 immovable magnet acts and the driven magnet becomes
Although it is held at an intermediate position in the movable range, when a direct current of arbitrary polarity and strength is supplied to the first and second electromagnets or one of the electromagnets , the driven magnets are driven by the first and second electromagnets.
Flow control valve in which the valve body is moved forward and backward by a required amount in the axial direction of the inflow pipe / outflow pipe due to the magnetic force of the .