JPS599283Y2 - control valve - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a fluid control valve, and more particularly to a control valve having a governor function and a flow rate control function.

FIG. 1 is a sectional view showing a conventional control valve. In the figure, 1 is the control valve (governor) main body, and the gas supplied from the gas inlet {L2 is directed by the valve seat 4 and the valve body 5. Gas passage (
50 (hereinafter referred to as a "communication section"), it reaches the discharge section 3.

Reference numeral 6 denotes a diaphragm that fixes the valve body 5 and has an airtight effect against the atmosphere.

A pressure receiving plate 7 is fixed to the diaphragm 6 to keep the pressure receiving area of the diaphragm at a predetermined value at all times.

8 is a secondary pressure adjustment spring, and 9 is an adjustment screw for adjusting the spring pressure of this spring 8.

10 constitutes a primary chamber, and 11 constitutes a secondary chamber.

12 is a communication hole for communicating the space formed above the diaphragm 6 with the atmosphere.

The control valve (governor) configured as described above has atmospheric pressure and regulating gas pressure (referring to the pressure inside the secondary chamber 11).

Hereinafter referred to as secondary pressure.

), gas pressure (hereinafter referred to as primary pressure) supplied to the fluid artificial hole 2 is detected.

) It is possible to always maintain a constant secondary pressure regardless of fluctuations in

In operation, a set value determined by the force created in the diaphragm 6 due to the difference between the secondary pressure and the atmospheric pressure and the spring pressure of the adjustment spring 8, that is, a fixed pressure is applied.

If the secondary pressure is higher than this set pressure, the diaphragm 1 will rise, and if it is lower, it will fall.

The movement caused by the detection of this differential pressure is transmitted to the valve body 5, and the opening degree of the valve body 5 is changed so that when the pressure is higher than the set pressure, the flow passage cross-sectional area of the communication portion 50 is narrowed, and when it is lower, it is widened.

Therefore, the set pressure (secondary pressure) is determined by the area of the diaphragm 6 and the spring pressure of the adjustment spring 8, and is always maintained at a constant secondary pressure regardless of fluctuations in the primary pressure.In other words, the gas flow rate supplied to the load is always maintained. It is possible to keep it constant.

Therefore, since the conventional secondary pressure regulating device of the control valve is constructed as described above, when it is used for various gases or liquids such as LPG and city gas, it can be adjusted by adjusting the adjusting screw 9. It was necessary to change the next pressure setting.

Therefore, it is extremely inconvenient to handle, for example, a combustion device in which the type of gas is frequently changed or a combustion device in which the setting of the secondary pressure is frequently changed.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and the setting of the secondary pressure can be electrically adjusted with a simple structure that combines an electromagnet and a magnetic material.
The purpose of this invention is to provide a control valve that has both a governor function and a flow rate control function.

An embodiment of this invention will be described below with reference to FIG.

In FIG. 2, 1 to 12 and 50 indicate the same or equivalent parts as in FIG. 1, and in particular, 1, 5 and 7 are made of non-magnetic material.

An electromagnet 13 has a pot-shaped outer magnetic pole, and has a central magnetic pole 14 at its central axis.

15 is a winding frame, 16 is a winding wire, and a magnetic path is formed by energizing the winding wire 16.

The magnetic path of the electromagnet 13 is formed in an air gap connecting the central magnetic pole 14, the open side 13a of the outer magnetic pole, and the tip 14a of the central magnetic pole. The structure has been devised so that a large amount of it occurs on the lower side (control valve body side).

17 is a cylindrical permanent magnet whose central axis is the central magnetic pole 14
The above-mentioned 5,
6. The magnet 7 is held integrally with the electromagnet 13, and its polarity is axially magnetized, and the magnet 13 is provided with the same polarity side facing the electromagnet 13.

Therefore, when the winding 16 is not energized, it is attracted to the center magnetic pole 14 by its own magnetism, and when the winding 16 is energized, the center magnetic pole 14 is excited to the same polarity.
A circumferentially uniform magnetic repulsion force F1 is generated between the permanent magnet 4 and the permanent magnet 17.

Therefore, by varying the electromagnet power, the magnetic repulsion force can be varied almost proportionally.

In the embodiment shown in FIG. 2, the above magnetic repulsion force can be effectively obtained by setting the gap B between the permanent magnet 17 and the opening 13a of the outer magnetic pole to be A<B.

In addition, in this structure, the stress that would cause the permanent magnet 17 to shift from the central axis is almost eliminated because the structure of the electromagnet 13 and the permanent magnet 17 is axially symmetrical and a uniform magnetic repulsion force is obtained in the circumferential direction. It is considered to be zero.

In addition, due to the influence of the secondary pressure on the diaphragm 6, the valve body 5 and the permanent magnet 17 have a structure with a uniform damper in the circumferential direction, and there is almost no misalignment of the axes of the electromagnet 13 and the permanent magnet 17, so that the magnetic The valve body 5 can move up and down smoothly due to the differential pressure between the repulsive force and the force exerted by the secondary pressure on the diaphragm.

FIG. 3 shows the characteristics of the control valve shown in the above embodiment.

In the figure, point a is the point at which the permanent magnet 17 loses its attractive force with respect to the center magnetic pole 14, that is, the point at which the magnetic force of the electromagnet 13 and the magnetic force of the permanent magnet 17 become equal.

If the electromagnet power is further increased from this point, it becomes possible to gradually adjust the secondary pressure, and it becomes possible to obtain the desired secondary pressure.

Therefore, by changing the magnitude of the current flowing through the winding 16, it is possible to obtain a flow rate of fluid commensurate with the secondary pressure, while on the other hand, when the above-mentioned current is maintained at a desired value, it can act as a governor. is possible.

In FIG. 3, almost the same curve is obtained when the flow rate is plotted on the vertical axis.

Conventionally, a flow rate control valve was provided separately from the governor before the governor, but as can be understood from the above explanation, this invention has the remarkable feature that it is possible to have both of these functions in one device. has.

In addition, in order to effectively obtain magnetic repulsion force in the structure shown in FIG. Can't get repulsive force.

In addition, in order to maintain the characteristics shown in Figure 3 over a long period of time, it is necessary to carefully examine the magnetic characteristics of the permanent magnet and design the electromagnet and other components to avoid the effects of demagnetization. It goes without saying that there is.

It goes without saying that ferrite magnets or other permanent magnets with large coercive force may be used to effectively obtain magnetic repulsion.

In addition, according to this invention, in a structure where the valve body and valve seat are sufficiently airtight, when the electromagnet is not energized, the permanent magnet exerts an attractive force on the central magnetic pole, and therefore It has the advantage of also having the effect of a fluid shutoff valve.

FIG. 4 shows another embodiment of this invention, which is equipped with an outer magnetic pole 17b as a permanent magnet 17, which is protruded from the outer periphery of a central magnetic pole 17a and has a polarity opposite to that of the central magnetic pole 17a. This is an example using .

In this case, it can be expected that the repulsive force will work even more effectively.

In addition, the permanent magnet 17 and the valve body 5 may be made of the same material.

Note that in the embodiments described above, the structure of the electromagnet 13 is composed of a central magnetic pole 14 and crucible-shaped magnetic poles surrounding it, but this structure is not necessarily required.
For example, the pot-shaped outer magnetic pole may be composed of a U-shaped yoke and a ring-shaped magnetic pole.

The reason why the magnetic poles surrounding the permanent magnet 17 are made into an annular shape is to make the repulsive force generated between the permanent magnet 17 and the permanent magnet 17 uniform and balanced. This is because it has a great influence on maintaining a good proportional relationship with

Incidentally, in the above description, a case has been described in which repulsion is used, but it goes without saying that this is not necessarily the case; therefore, other magnetic materials such as silicon steel may be used instead of permanent magnets.

Furthermore, it goes without saying that it can also be used as a control valve for liquids other than gas, or liquids such as slough.

Furthermore, although the above embodiments have been described as having a diaphragm in the secondary chamber, it goes without saying that it is also possible to provide a diaphragm in the primary chamber by appropriately selecting the areas of the valve body and the diaphragm.

The present invention can be effectively used as an input control governor that feeds back information such as room temperature and hot water temperature to control fuel input to obtain a predetermined room temperature and hot water temperature, and can also be used in combustion devices, internal combustion engines, etc. It is widely used as a valve to control the air and fuel consumption of vehicles.

As explained above, the control valve of this invention includes a primary chamber that receives fluid to be supplied, a secondary chamber that communicates with this primary chamber via a communication part and receives fluid from the primary chamber, and is provided in this secondary chamber. a diaphragm that forms a part of the primary chamber or the secondary chamber and is movable in response to the pressure of the primary chamber or the secondary chamber; a flow path of the communication section that is movable together with the diaphragm; A valve body having a variable cross-sectional area, a magnetic body held by the valve body, and an electromagnet capable of attracting or repelling the magnetic body, wherein the central axes of the magnetic body and the valve body are aligned with the diaphragm. The electromagnet has a structure in which the central axis of the central magnetic pole of the electromagnet coincides with the central axis of the magnetic body, and an annular outer magnetic pole is arranged around the central magnetic pole. Since it has a structure in which an air gap is formed between the outer magnetic pole and the central magnetic pole and the magnetic body, it is easy to adjust the secondary pressure, and the proportional relationship between the amount of current and the secondary pressure is maintained. can be kept in good condition.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view showing a conventional governor, Fig. 2 is a sectional view of essential parts showing an embodiment of this invention, Fig. 3 is a diagram showing the characteristics of the control valve of this invention, and Fig. 4 is a diagram showing the characteristics of the control valve of this invention. FIG. 7 is a sectional view of a main part showing another embodiment. In the figure, 3 is a discharge part, 5 is a valve body, 6 is a diaphragm as an elastic member, 13 is an electromagnet, 17 is a permanent magnet, and 50 is a communication part. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) A primary chamber that receives the fluid to be supplied, a secondary chamber that communicates with this primary chamber via a communication section and receives fluid from the primary chamber, a fluid discharge section provided in this secondary chamber, and a diaphragm forming part of a chamber or a secondary chamber and movable in response to the pressure of the primary chamber or the secondary chamber;
A valve body that moves together with the diaphragm and can vary the flow path cross-sectional area of the communication portion, a magnetic body held by the valve body, and an electromagnet that can attract or repel the magnetic body. The valve body is arranged so that its respective central axes coincide with the central axis of the diaphragm, and the electromagnet is arranged so that the central axis of its central magnetic pole coincides with the central axis of the magnetic body, and A control valve having a structure in which an annular outer magnetic pole is arranged around the periphery, and an air gap is formed between the outer magnetic pole, the central magnetic pole, and a magnetic body. (2) The control valve according to claim 1, wherein the magnetic body is a permanent magnet.