JPS5913417Y2 - gas flow control valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control valve that accurately controls the flow rate of gas in proportion to the control current.

FIG. 1 is a sectional view showing the configuration of the main parts of this type of conventional control valve, in which 1 is the valve body, 2 is a coil, and 3 is a plunger, the tip of which is inserted into a hole 31 formed at both ends. The other end of the leaf spring 4 is fixed to the valve body 1, and the valve body 5, which is normally locked to the tip of the plunger 3 by the elastic force of the spring plate 4, is supported by the inserted leaf spring 4. The gas that is pressed against the seat 6 and forced to flow from the inlet lower is sealed.

When the coil 2 is energized now, a suction force corresponding to the amount of energization acts on the plunger 3, and it stops at a displacement position that is balanced with the elastic force of the leaf spring 4. The valve opens according to this displacement, and the flow rate is proportional to the amount of opening. of gas is delivered from outlet 8.

In this case, the spring plate 4 not only determines the opening degree of the valve in balance with the suction force of the plunger 3, but also is formed to have the same size so that the plunger 3 is displaced parallel to the central axis of the coil 3.

The conventional control valve configured in this manner has a complicated structure, in which the plunger 3 is supported at both ends by spring plates 4 to prevent it from coming into contact with other members when it is displaced.
Also, since it is difficult to seal between the gas flow path and the coil 3, the entire structure needs to be airtight.Furthermore, since the gas is sealed when the gas is stopped by the elastic force of the spring plate 4, a certain degree of strong elasticity is required. Accordingly, it is necessary to increase the attractive force of the plunger 3, which has the disadvantage of requiring a large operating current.

This idea was made in view of the above-mentioned difficulties with conventional control valves, and uses an electromagnet and a permanent magnet.When the valve is stopped, the valve is closed by the magnetic attraction between the central magnetic pole of the electromagnet and the permanent magnet, and when it is in operation, the valve is closed. The permanent magnet is displaced by the repulsive force between the central magnetic pole of the electromagnet and the permanent magnet, and the attractive force between the surrounding magnetic poles of the electromagnet and the permanent magnet, and the permanent magnet is displaced according to the displacement of the valve body connected to this permanent magnet. It is designed to regulate the gas flow rate.

FIG. 2 is a sectional view of an embodiment of this invention, in which 9 is an electromagnet, 91 is a central magnetic pole, 92 is a pot-shaped magnetic pole, and 93 is a coil.

Reference numeral 10 denotes a permanent magnet made of a ferrite magnet, etc., which is supported by a diaphragm 11 at a position facing the center magnetic pole 91. When the coil 93 is not energized, it attracts the center magnetic pole 91 with its own magnetism, and the coil 93 When energized, the center pole 91 is excited with the same polarity as the magnetic pole of the permanent magnet 10, and a magnetic repulsion force F1 is generated between the center pole 91 and the permanent magnet 10.

The permanent magnet 10 has an attractive force between this repulsive force F1 and the pot-shaped magnetic pole 92 that resists this repulsive force F1, and the diaphragm 1
The valve body 5 is displaced to a position where the elastic stress caused by the displacement 1 and the sum F2 of the gas pressure applied to the valve body 5 are balanced, and the flow rate of the gas is regulated.

12 is a connecting member between the permanent magnet 10 and the valve body 5, and 13 is a through hole that communicates the inside of the electromagnet 9, which is hermetically sealed with the diaphragm 11, with the outside air.

In the control valve configured in this manner, when the coil 93 is not energized, the valve body 5 is pressed against the valve seat 6 by the attraction force of the permanent magnet 10, and the valve seat 6 is hermetically sealed. When energized, it is possible to change the magnitude of the repulsive force F1 between the center magnetic pole 91 and the permanent magnet 10 according to the amount of energization, and the larger the magnetic flux of the permanent magnet 10, the stronger the magnet. The stronger the repulsive force F1 is, the greater the repulsive force F1 is with the same amount of energization.Therefore, there is an advantage that the amount of energization of the coil 93 is smaller than that of the conventional control valve described above.

Furthermore, since the permanent magnet 10 and the center magnetic pole 9 face each other in planes, there is no need to accurately align the center axes as in conventional control valves, and there is also the advantage that the structure is simple.

Furthermore, if a permanent magnet 10 having a large coercive force, such as a ferrite magnet, is used, there is an advantage that stable operation can be expected for many years.

In addition, in the configuration of the embodiment shown in FIG. 2, the permanent magnet 1
The displacement of 0, that is, the displacement of the valve body 5, operates at a position where Fl and F2 are in equilibrium, and Fl is determined by the amount of current flowing through the coil 93, while F2 is the product of the pressure receiving area of the diaphragm 11 and the gas pressure in the chamber. Since the pressure of the gas delivered from the outlet 8 is approximately proportional to Fl.

After all, if F1 is kept constant, there is also the advantage of having the function of keeping the gas pressure at the outlet 8 almost constant even if the gas pressure at the inlet lower fluctuates somewhat.

FIG. 3 is a characteristic diagram showing the relationship between the amount of energization of the coil 93 and the gas flow according to an embodiment of the present invention, and shows the relationship between the amount of current flowing through the coil 93 and the gas flow. This shows that if the various conditions that cause F2 to occur are appropriately designed, a good proportional relationship can be obtained over a wide range.

FIG. 4 is a sectional view of another embodiment of this invention, showing the gas outlet 8.
The structure is suitable for use in situations where the internal gas pressure is high.

A diaphragm 14 airtightly partitions the electromagnet 9 and the gas flow path, and is made of rubber, plastic, or the like.

Reference numeral 15 is a through hole formed in the diaphragm 15, and reference numeral 16 is a coiled spring that assists when stopping the plug.

In this way, the diaphragm 11 only needs to support the permanent magnet 10 and the valve body 5, and the displacement of the valve body 5 can be controlled only by the balanced relationship between F2 and Fl given only by the spring force caused by the displacement of the spiral spring. It was configured to be determined.

As a result, even when the gas pressure is high, the flow rate can be controlled using a small Fl.

Note that in the embodiments described above, the structure of the electromagnet 9 was shown to be composed of a center magnetic pole 91 and a crucible-shaped magnetic pole 92 surrounding it, but it is not necessarily necessary to have this structure.
For example, as shown in FIG. 5, the pot-shaped magnetic pole may be composed of a U-shaped yoke 94 and a ring-shaped magnetic pole 95.

The purpose of making the magnetic poles surrounding the permanent magnet 10 into an annular shape in this way is to make the repulsive force generated between the permanent magnet 10 and the permanent magnet 10 uniform and balanced, so that the amount of current applied and the gas flow rate are balanced. This is because it has a great influence on maintaining a good proportional relationship.

As explained in detail above, this invention includes an electromagnet, a permanent magnet displaceably supported at a position opposite to the magnetic pole surface of the central pole of the electromagnet, a valve body connected to the permanent magnet, and and an elastic support member that generates a force that resists the repulsive force when the permanent magnet is displaced due to the repulsive force generated between the permanent magnet and the permanent magnet when energized,
The valve is closed by the magnetic attraction force of the permanent magnet, and the valve is opened by the repulsive force generated between the electromagnet and the permanent magnet when energized, so less power is required to open and close the valve or to control the gas flow rate. It has many advantages such as simplicity.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a conventional control valve, Fig. 2 is a cross-sectional view of an embodiment of this invention, Fig. 3 is a characteristic diagram showing the relationship between energization amount and gas flow rate, and Fig. 4 is another example of this invention. FIG. 5 is a partial perspective view showing an example of the structure of the electromagnet according to the invention. In the figure, 1 is the control valve body, 5 is the valve body, 6 is the valve seat, and 7
is a gas inlet, 8 is a gas outlet, 9 is an electromagnet, 91 is a center magnetic pole, 92 is a pot magnetic pole, 93 is a coil, 94 is a U-shaped magnetic pole, 95 is a ring-shaped magnetic pole, 10 is a permanent magnet, 11 is a diaphragm , 12 is a connecting member, 13.15 is a through hole, 14
is a diaphragm, and 16 is a coiled spring. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] a valve mechanism having an electromagnet, a permanent magnet displaceably supported such that one magnetic pole surface always faces a magnetic pole surface of a central magnetic pole of the electromagnet, and a valve body connected to the permanent magnet;
The permanent magnet support also serves as a member for airtightly partitioning between the electromagnet and the outlet valve chamber, and means for regulating the amount of displacement of the permanent magnet by gas pressure in the outlet valve chamber applied to the support member, A gas flow control valve configured to open the valve when the electromagnet is energized, and close the valve when the electromagnet is not energized by the force of the permanent magnet attracting the center magnetic pole of the electromagnet.