JPH02236078A - Magnetic operating valve - Google Patents

Abstract

PURPOSE:To open or close a valve through remote control and prevent malfunction and heating of a solenoid coil by constituting the device so as to make a plunger movable by use of attractive force and repulsive force acting on a permanents magnet at exciting the solenoid coil. CONSTITUTION:A plunger 7 is fitted into a non-magnetic casing 1, an a permanent magnet 13 is fixed on the outside of the casing. On the outside of the casing 1, a pair of iron-series discs 14A, 14B putting the permanent magnet 13 between are opposingly provided, and also a pair of solenoid coils 15A, 15B switchable to same polarity on the opposed sides are provided. At exciting, the plunger 7 is constituted so as to be movable by use of attractive force acting to the permanent magnet 13 from one side disc 14A or 14B and repulsive force acting to it from another side disc 14B or 14A. Further, a fluid passage 12 communicated to one side fluid port 3 is formed in the plunger 7, and the plunger 7 is set so as to enable to shut a communicating passage 10 between another fluid port 2 and the fluid passage 12 at the moving stroke end.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetically operated valve, and particularly to a magnetically operated valve that is effective for use with cryogenic fluids such as liquid helium and superfluid helium.

[Conventional technology]

Conventionally, in a solenoid valve, a valve zero body 21 as a valve for low-temperature fluid and a housing 22 are connected via a sleeve 23, and a long valve stem 24 is fitted into the sleeve 23, as shown in FIG. A valve body 21 and an electromagnetic drive section 25 in a housing 22 are connected via a rod 24, and the electromagnetic drive section 25 is provided in a room temperature section, as shown in FIG. 5, which is widely used in pneumatic equipment. A valve that can be applied to low-temperature equipment includes a solenoid coil 26 with a movable plunger 7 for opening and closing the valve, and an impulse type valve with a fixed iron core 27 inside the solenoid coil 26 as shown in FIG. , a permanent magnet 13 is fixed within the iron core 27, and the permanent magnet 1
A movable plunger 7 for opening and closing the valve is provided in 3,
The plunger 7 is provided with a return spring 28 that urges the closing force, and the plunger 7 can be moved upward or downward by overcoming the force of the return spring 28 or the permanent magnet 13 depending on the way the solenoid coil 26 is excited. It has been known.

[Problem to be solved by the invention]

However, the one shown in FIG. 4 has the advantage that a low-temperature portion is generated on the valve zero body 21 side between the sleeve 23 and the valve stem 24, and the low-temperature portion can reduce heat intrusion into the valve body 21. On the other hand, heat loss due to heat conduction along the valve stem 24 is unavoidable. In the case shown in FIG. 5, countermeasures are required for cooling, and problems such as preventing heat generation in the solenoid coil 26, sealing between the plunger 7 and the valve body 21, and low-temperature operating conditions (thermal contraction) of the plunger 7 cannot be improved. Application at extremely low temperatures is difficult. Furthermore, the valve shown in FIG. 6 has the advantage that the valve can be opened and closed simply by instantaneously energizing the solenoid coil 26, preventing the solenoid coil 26 from generating heat, and that the valve can be opened and held by the permanent magnet 13 even when the solenoid coil 26 is not energized. On the other hand, the opening operation of the valve requires electromagnetic thrust to overcome the force of the return spring 28 that presses the plunger 7 against the valve seat 5, and at the same time, it is necessary to use a strong permanent magnet 13. In addition, when the valve is open, a spring reaction force is acting in the opposite direction to the direction in which the plunger 7 is held by the permanent magnet 13, so when applied to a device that is subject to acceleration or impact, the plunger 7 comes off the permanent magnet 13 and lowers. There was the inconvenience of fear.

By the way, in a cryostat that operates at liquid helium temperatures, it is necessary to perform extremely high insulation to prevent evaporation loss of liquid helium and maintain a low temperature. Similarly, it is necessary to select specifications that have a low heat penetration design and high reliability. In addition, in the form of a thalaostat, for example, a thalaiostat installed on a satellite filled with liquid helium for infrared observation telescopes in space as a coolant for infrared elements must be equipped with a gas release valve (safety valve). This hull must be able to be controlled remotely, and the operational life of the satellite is determined by the amount of liquid helium it fills, so it is important to reduce heat intrusion from the hull as much as possible. Moreover, it is necessary that the device not malfunction even if acceleration or impact is applied during the launch of an artificial satellite. Therefore, since the conventional electromagnetic valve cannot be used for cryogenic fluids such as liquid helium, it has become necessary to develop a magnetically operated valve for cryogenic fluids of an unprecedented type.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and is a form that eliminates the above-mentioned disadvantages of impulse type solenoid valves.

[Failure to solve the problem]

As shown in FIGS. 1 and 2, the magnetically operated valve of the present invention includes a plunger 7 fitted inside a non-magnetic casing 1, a permanent magnet 13 fixed to the outside of the plunger 7, and a permanent magnet 13 fixed to the outside of the plunger 7. A pair of iron-based disks 14A and 14B are provided on the outside of the magnet 1, and the permanent magnet 13 is sandwiched therebetween, and a pair of iron-based disks 14A and 14B are provided on opposing sides at a distance from each other in the direction of plunger movement. Solenoid coils 15A and 15B are provided, and the solenoid coil 1
When magnets 5A and 15B are excited, the plunger 7 is moved toward one or the other disk by using the attractive force acting on the permanent magnet 13 from one disk 14A (or 14B) side and the repulsive force acting from the other disk 14B (or 14A) side. The plunger 7 is configured to be movable to the side, and a fluid passage l2 communicating with one fluid port 3 is formed inside the plunger 7, and the plunger 7 is connected to the other fluid port 2 at one stroke end of the plunger 7. It is characterized in that a communication path with the fluid passage 3 is provided so as to be able to be shut off, and this configuration achieves the above object.

[For production]

As shown in FIG. 3, when the disk 14A side of the permanent magnet 13 is the north pole and the disk 14B is the south pole,
When the solenoid coils 15A and 15B are energized and energized to generate an S pole (or N pole) on the disk 14A side of the solenoid coil 15A and on the disk 14B side of the solenoid coil 15B, the permanent magnet 13 and the disk 14A (or 14
B) attracts each other, and the permanent magnet 13 and the disk 14B (or 14A) repel each other, and the permanent magnet 13 moves toward the disk 14A (or 14B) due to both the attractive force and the repulsive force. The plunger 7 is moved within the casing 1 via the permanent magnet 13 to open and close the valve.

After the solenoid coils 15A and 15B are demagnetized, the permanent magnet 13 attracts the disk 14A (or 14B), and there is no large force acting to separate the permanent magnet 13 from the disk 14A (or 14B). ,
The open/closed state of the valve is reliably maintained.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the figure, 1 is a non-magnetic casing formed in a cylindrical shape, and a fluid port 2 (inlet) and a fluid port 3 (outlet) are provided at both ends of the casing 1, and a fluid port 3 (outlet) is provided at a predetermined interval in the circumferential direction in the middle part. A valve seat 5 is provided at the inner end of the fluid port 2, and a stopper spring 6 such as a disc spring is provided at the inner end of the fluid port 3.

A plunger 7 is movably fitted into the casing 1 via a sliding bearing 8.

A valve body portion 9 that can come into contact with a valve seat 5 provided in the fluid port 2 is formed at the end of the plunger 7 on the fluid port 2 side, and a valve body portion 9 on the side opposite to the valve seat 5 of the valve body portion 9 is formed in the circumferential direction. Fluid passages 1 at predetermined intervals
0 is opened, and the inside of the plunger 7 is in communication with the gap 11 formed between the casing 1 and the valve body portion 9 via the fluid passage 10, and is in constant communication with the fluid port 3. A fluid passage 12 is formed.

Permanent magnets 13 are fixed to the outside of the plunger 7 and arranged in rows in the circumferential direction, and project radially to the outside through an opening 4 provided in the casing l.

A pair of iron-based disks 14A and 14B are provided outside the casing l so as to sandwich the permanent magnet l3 and face each other at a distance in the plunger movement direction.

15A and 15B are a pair of solenoid coils having the disks 14A and 14B on opposite sides, respectively, and are connected to the casing 1.
It is located outside of the

A power source 17 is connected to the solenoid coils 15A and 15B via a changeover switch 16, and the disk 14A side of the solenoid coil 15A and the solenoid coil 1
By switching the changeover switch 16, the same polarity can be generated on the opposing sides of the solenoid coils 15A and 15B so that the disk 14B side of the solenoid coils 15A and 15B becomes the S pole (see FIG. 3) or the N pole.

Reference numeral 18 denotes a housing that is detachably installed between the outer periphery of the disk 14A and the solenoid coil 15A and the outer periphery of the disk 14B and the solenoid coil 15B, and is provided with an annular seal space in the outer periphery of the opening 4 of the casing 1. 1
9 is formed.

20A and 20B are magnetic sensors, respectively, for disks 14A and 20B.
It is attached to 14B.

In the embodiment, the valve seat 5 provided on the inner edge of the fluid port 2
Although a poppet-type valve has been described in which a plunger member 7 is provided that is movable relative to the plunger 7, and a valve body portion 9 that can come into contact with the valve seat 5 is formed on the plunger 7, the present invention can also be applied to a Sbourg-type valve. Needless to say.

In the above configuration, as shown in FIG.
The disk 14A side of the disk 14A is the N pole, and the disk 14B
When the S pole is set, the solenoid coils 15A and 15B are energized and the disk 14A of the solenoid coil 15A is
S on the side and the disk 14B side of the solenoid coil 15B.
When a pole is generated, the permanent magnet 13 and the disk 14A are attracted to each other, and the permanent magnet 13 and the disk 14B are attracted to each other.
repel each other and the permanent magnet 13 moves toward the disk 14A due to both the attractive force and the repulsive force, so the plunger 7 moves inside the casing 1 through the permanent magnet 13 into the
The valve body portion 9 is moved to the left in the figure and comes into contact with the valve seat 5 provided in the fluid port 2, and communication between the fluid port 2 and the fluid passage 12 in the plunger 7 is cut off (closing the valve). . and,
After demagnetizing the solenoid 10 coils 15A and 15B, the permanent magnet 13 attracts the disk 14A, and since there is no large force acting to separate the permanent magnet 13 from the disk 14A, the valve is reliably kept in the closed state. be done. For this reason,
Even if strong acceleration or impact is applied, the permanent magnet 13 will not accidentally separate from the disk 14A.

Switch the changeover switch 16, and the solenoid coil 15A
, 15B are magnetized by generating a magnetomotive force in the opposite direction, and when N poles are generated on the disk 14A side of the solenoid coil 15A and on the disk 14B side of the solenoid coil 15B, contrary to the above, the permanent magnet 13 and the disk 14A are The permanent magnet 13 and the disk 14B repel each other, and the permanent magnet 13 and the disk 14B attract each other, and the permanent magnet 13 moves toward the disk 14B due to both the attractive force and the repulsive force. 1 to the right in FIG. They communicate with each other via passages 10, 12 (opening of the valve). Solenoid coil 15A
, 15B, the permanent magnet 13 continues to attract the disk 14B, so the valve remains open.

Therefore, even if a strong acceleration or impact force is applied, the permanent magnet 13 will not accidentally separate from the disk 14A, and the fluid from the fluid port 2 will flow between the fluid passages 10 and 12.
It flows out to the fluid port 3 through the.

Note that a part of the fluid flows between the disks 14A and 14B through the gap l1 and the opening 4;
An annular sealing space 19 is formed between the outer circumferential portions of the valves 4B and is covered with a hanging 18, so that there is no leakage from the opening 4 to the outside of the valve.

Therefore, since the valve can be reliably opened and closed by remote control while being detected by the magnetic sensors 2OA and 20B, the magnetically operated valve can be connected to a liquid helium tank for emergency release of liquid helium from the liquid helium tank inside the cryostor or cryostat, for example. It is possible to install it in an emergency release pipe and place it in a vacuum chamber and use it without any trouble.

l1 [Effects of the Invention] As described above, the present invention utilizes the attractive force acting on the permanent magnet from one disk side and the repulsive force acting from the other disk side by simply changing the magnetism generated on the disk side of the solenoid coil. Since the plunger can be easily moved by moving the plunger, the valve can be reliably opened and closed by remote control.

In addition, there is no spring force that separates the permanent magnet from the adsorption disk, and there is no unbalance of force in the direction of movement of the plunger, so after the valve is opened or closed, the opening/closing position of the valve is determined by the disk adsorption by the permanent magnet. It can be held securely and will not malfunction due to strong acceleration or impact. Moreover, since instantaneous energization of the solenoid coil is sufficient, heat generation of the solenoid coil can be prevented, and heat loss of liquid helium in, for example, a taliostat can be reduced. Furthermore, if a superconducting magnetic wire material is applied to a solenoid coil, including the use of high-temperature superconductivity, a magnetically operated valve that does not generate heat can be realized in principle.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional front view showing one embodiment of the present invention, Fig. 2 is a schematic diagram showing an excitation circuit of a solenoid coil, Fig. 3 is an explanatory diagram of the operation, and Figs. 4, 5, and 6 are FIG. 2 is a longitudinal sectional front view showing a conventional example. ■...Casing, 2, 3...Fluid port, 4...Opening, 5...Valve seat, 7...
...Plunger, 8...Sliding sliding bearing,
9... Valve body portion, 10, 12... Fluid passage, 11... Gap, 13... Permanent magnet, 14A, 14B...・Disk, 15A, 1
5B... Solenoid coil, 16...
Selector switch, 17...Power supply, 18...
・Housing, 19... Seal space, 2OA,
20B...Magnetic sensor. Figure Figure

Claims (1)

[Claims] (1) A plunger is fitted inside a non-magnetic casing, a permanent magnet is fixed to the outside of the plunger, and the plunger is opposed to the outside of the casing at an interval in the moving direction of the plunger with the permanent magnet sandwiched therebetween. A pair of iron-based disks are provided on opposing sides, and a pair of solenoid coils that can switch and generate the same polarity are provided on the opposing sides, and when the solenoid coils are energized, an attractive force acts on the permanent magnet from one disk side and the other. The plunger is configured to be movable to one or the other disk side using a repulsive force acting from the disk side, and a fluid passage communicating with one fluid port is formed inside the plunger, and the plunger is A magnetically operated valve characterized in that a communication path between the other fluid port and the fluid passage can be shut off at one stroke end of the plunger.