JPS5834716B2 - Flow rate multistage control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a multistage flow rate control valve that can change the opening degree of a flow path of one small solenoid valve in multiple stages using an electromagnet.

Structure of the conventional example and its problems A conventional flow rate multi-stage control valve, for example, as shown in FIG. There is a method in which the determination is made by displacing the iron piece 25 using an electric current.

However, in this configuration, the iron piece 25 is connected to the coil 23.2.
Since the flow rate cannot be stopped at an intermediate position of 4, it is possible to change the flow rate only in two steps, and it is impossible to change the flow rate in three or more steps.

Technical Problems of the Invention The present invention performs flow rate control with a number of stages greater than the number of electromagnets, that is, the valve is made to remain stationary even at an intermediate position between a pair of drive coils.

Technical means of the invention The technical means taken to achieve the above-mentioned technical problem are as follows.

That is, a plurality of the drive coils are overlapped at intervals in the longitudinal direction of the plunger, the magnetic cores of the respective drive coils have a shape of a cross section, and a small interval is interposed between adjacent magnetic cores, The ends thereof are located opposite to the plunger, and the small interval between a pair of adjacent magnetic cores is set narrower than the interval between both ends of each of the magnetic cores, and the plurality of magnetic cores The plunger is provided with a number of annular flanges equal to the number of ends of the plunger, and the distance between the annular flanges of the plunger that is approximately opposite to each end of each of the magnetic cores is set to be narrower than the distance between the respective ends of each of the magnetic cores. At the same time, the distance between the annular flanges of the plunger that substantially opposes these ends is set narrower than the distance between the adjacent ends of the pair of adjacent magnetic cores.

Action of technical means The effects of the above-mentioned technical means are shown in Figures 1A, B, and C.

This will be explained below with reference to the principle diagram of D.

In Figures A, B, C, and D, 10 indicates a plunger, and 6, 7, 8, and 9 indicate annular flanges.

11.12 indicates the drive coil, 14°15.16,1
7 indicates the magnetic poles of the magnet core.

First, in FIG. 7A, which does not show any of the drive coils 11, 12, the plunger 10 is in a closed state.

Next, FIG. 7B shows a state in which only the drive coil 11 is energized.

In this state, the plunger 10 is attracted to rest so that its annular flange 6.1 is positioned exactly midway between the magnetic poles 14, 15 of the magnetic core.

This is the first stage (small flow rate).

A state in which both the drive coil 11 and the drive coil 12 are energized is shown in Fig. γC.

In this state ζ, the annular flange 6.1 of the plunger 10 is attracted to the magnetic pole 14.15, and the flanges 8, 9 are attracted to the magnetic poles 16, 1γ of the magnetic core.

However, due to the weight of the plunger 10 and the force of the downward biasing spring, the plunger 10 comes to rest slightly below the middle.

This is the second stage (medium flow rate). Next, the seventh diagram shows a state in which the drive coil 11 is not energized and only the drive coil 12 is energized.

In this state, the annular flange 8 of the plunger 10
．． 9 is attracted to the magnetic poles 16 and 17 of the magnetic core, resulting in the third stage (large flow rate).

In this way, three different opening degrees can be obtained with two drive coils.

The case where two drive coils are stacked one above the other has been explained above, but by stacking the drive coils one above the other and following the order of energization to the drive coils described above, the plunger can be moved upward in stages. can be raised to

The same thing can be done even if the drive coils are stacked horizontally. According to the above-mentioned technical means, in the non-energized state, the plunger is located at the lowest stage, and then the plunger is energized only under the pair of driving coils, so that the stepped part in the lower half of the plunger is located at the lowermost stage of the driving coil. The plunger is drawn into the first
rise to the stage.

Next, when both of the pair of drive coils are energized, the upper half of the plunger is attracted to the upper drive coil, and the lower half of the plunger is attracted to the lower drive coil. A plunger is located approximately in the middle of the drive coil and rises to the second stage.

Furthermore, when the lower drive coil is de-energized in this state and only the upper drive coil is energized, the stepped portion of the upper half of the plunger is attracted by the upper drive coil and rises to the third stage.

In this way, three levels of opening degree can be sequentially obtained for the pair of drive coils.

Effects of the Invention As a configuration for stopping the plunger between a pair of drive coils, it is possible to use a spring that applies a force to the plunger so that the plunger is positioned exactly between the pair of drive coils, but this configuration The elastic modulus of the spring is required to be extremely accurate with no variations during mass production, and there is also a requirement that there be no errors during assembly.The spring expands and contracts as the gas pressure changes, ensuring a stable gas flow. The quantity is not as expected.

In contrast, the method of the present invention provides a stable amount of gas at any stage.

Examples showing concrete examples of technical means An embodiment of the present invention will be described below with reference to the drawings.

In the figure, a valve body 1 serving as a fluid passage has an inlet 2
A valve seat 4 is provided between the outlet port 3 and the outlet port 3.

A valve body 5 for opening and closing the flow of fluid is provided corresponding to the valve seat 4, and the plunger 10 equipped with the valve body 5 has flanges 6, 7, 8, and 9. There is a drive coil 1L12 on the outer periphery of the guiding cylinder 13, and the drive coil 12.13 is surrounded by magnetic poles 14, 15, 16, and 17 of the magnetic core shaped like a cutout to form a magnetic circuit. A magnetic insulating member 18 is interposed between the cores 15 and 6, and the drive coils 11, 12,
Magnetic poles 14, 15, 16, 17, magnetic insulating member 18, etc.
It is fixed by a fixture 191.

The spacing between the flanges 6.7 of the plunger 10 is determined by the distance between the magnetic poles 14
．． The spacing between the flanges 8 and 9 corresponds to the spacing between the cylinder side end surfaces of the magnetic poles 16 and 17.

and plunger flange 6.7 and flange 8,9
The pitch P between the drive coils 11 and 12 is smaller than the pitch P' between the drive coils 11 and 12.

Reference numeral 20 denotes an elastic body such as a spring that biases the valve body 5 in the closing direction.

Next, the operation of the above configuration will be explained.

FIG. 1 shows the valve in the closed state.

The valve body 5 is moved downward by the elastic body 20, that is, the valve body 5 is
The drive coil 11
, 12, the valve is in a closed state as shown in FIG.

Next, FIG. 2 shows a state in which only the drive coil 11 is energized.

When the drive coil 11 is energized, the flanges 6 and γ of the plunger 10 are pulled up by the magnetic poles 14 and 15, and a gap is created between the valve body 5 and the valve seat 4 by the difference between the pitches P and P' of the two.

This state is a water flow state, and the water flows from the gas inlet 2 to the outlet 3 by the amount of the gap determined between the valve body 5 and the valve seat 4.

In this state, a gap including the non-magnetic cylinder 13 is interposed between the magnetic pole 14 and the opposing surfaces of the flange 6 of the plunger 10, so that when they are held magnetically, they attract each other. Even at its peak, its power is considerably weaker than when it was at its strongest.

This is because the magnetic force is inversely proportional to the square of the gap.

Therefore, in this state, another magnetic force is applied to the plunger 10.
This plunger 10 will easily move if it acts on this.

Next, FIG. 3 shows a state in which the drive coils 11 and 12 are energized.

As shown in FIG. 2, when the drive coil 11 is energized and the drive coil 12 is also energized, the plunger 10 attracts forces so that the flanges 8 and 9 are opposed to the magnetic poles 16 and 17. Flange 6.7 and magnetic pole 14°1
5 are still attracted to each other, so the plunger 10 ends up with its flanges 6, 7, 8, and 9 aligned with the magnetic poles 14, 15.
, 16, and 17 and are balanced and stopped at approximately the center.

However, the elastic body 20 is located below the center by the force that pushes the plunger 10 downward and the plunger 10's own weight.

The force of attraction between the magnetic poles 14 and 15 and the flange 6°γ of the plunger 10 is strong, but as mentioned above, the gap is large, so it is not the strongest magnetic force, and it is barely balanced, so the force from the outside is strong. Adding to this,
This balance is broken, and as mentioned above, the plunger 10
is pulled upwards a little, then stops and balances again.

This state is a medium flow state, and gas flows from the inlet 2 to the outlet 3 by the amount of the gap determined between the valve body 5 and the valve seat 4.

Next, FIG. 4 shows a state in which only the drive coil 12 is energized and the drive coil 11 is cut off.

In this state, the power to the drive coil 11 below the state shown in FIG. 3 is cut off, and the flanges 8 and 9 of the plunger 10 are attracted to the magnetic poles 16 and 1γ, and the plunger 10 is located at the top.

This state is a large flow state, and gas flows from the inlet 2 to the outlet 3 by the amount of the gap determined between the valve body 5 and the valve seat 4.

FIG. 5 is a diagram showing the relationship between the opening degree of the valve and the flow rate of the fluid, and the diagram shows the relationship between the opening degree of the valve and the flow rate of the fluid, and the flow rate can be obtained in three stages: from closed to fully open, and in three stages: small, medium, and large.

The basic operation of the present invention is shown in Figures A, B, C, and D.

Fig. γ A is in the closed state and corresponds to Fig. 1, and Fig. γ B
is the state of the first stage (small flow rate) and corresponds to Fig. 2, Fig. 1 C is the state of the second stage (medium flow rate) and corresponds to Fig. 3, and Fig. 7 is the state of the third stage ( This state corresponds to FIG. 4.

In FIG. 7A, neither of the drive coils 11 and 12 is energized, so the plunger 10 is in an open state.

In FIG. TB, only the drive coil 11 is energized, so the plunger 10 is attracted and stands still so that the flange 6.7 is positioned exactly between the magnetic poles 14 and 15.

This is a small state. In Fig. 1C, drive coil 1
Since both 1 and 12 are energized, the plunger 10 has flanges 6.1 attracted to magnetic poles 14 and 15, and flange 8.
9 is attracted to the magnetic poles 16 and 17.

However, due to the weight of the plunger 10 and the force of the downward biasing spring, the plunger 10 comes to rest slightly below the middle.

This is a small state. Furthermore, in the seventh drawing, the drive coil 11 was not energized and only the drive coil 12 was energized, so the flanges 8 and 9 of the plunger 10 were at a magnetic pole of 16°I.
It is attracted by T and enters a large state.

In this way, three different opening degrees can be obtained with two drive coils.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and if a larger number of stages is required, the number of drive coils and the flanges of the plunger may be increased.

[Brief explanation of drawings]

Figures 1 to 5 show an embodiment of the present invention. Figure 1 is a sectional view when the valve is closed, Figure 2 is a sectional view when the drive coil 11 is energized, and Figure 3 is a sectional view when the drive coil 11 is driven. FIG. 4 is a cross-sectional view when the coil 12 is energized, FIG. 4 is a sectional view when the drive coil 12 is energized, FIG. 5 is a relationship between fluid flow rate and valve opening, and FIG. 6 is a diagram of a conventional solenoid valve. The sectional views and FIGS. 1A, B, C, and D are configuration diagrams showing the basic operation of the present invention. 1...Body, 4...Valve seat, 5...
...Valve body, 10...Plunger, 13...
...Cylinder 11゜12...Drive coil, 14,15,16,17...Magnetic core
20...Elastic body.

Claims (1)

[Claims] 1 A valve body that has a fluid passage inside, a valve body that covers the valve seat provided in the middle of this fluid passage so that it can be opened and closed, and controls the flow rate of fluid, and a valve body that is equipped with this valve body and that opens and closes the valve body. A flow rate multi-stage control valve having a plunger that can be operated freely and a multi-stage drive coil that drives the plunger, wherein a plurality of the drive coils are overlapped at intervals in the longitudinal direction of the plunger, and each of the above-mentioned The magnetic core surrounding the drive coil is shaped like a single character in cross section, and a small interval is interposed between adjacent magnetic cores, and the ends thereof are located opposite to the plunger, and both ends of each of the above-mentioned magnetic cores are arranged. The plunger is provided with annular flanges in a number equal to the number of ends of the plurality of magnetic cores; The distance between the annular flanges of the plunger that substantially opposes both ends of the magnetic cores is set narrower than the distance between the ends of each of the magnetic cores, and the distance between the adjacent ends of the pair of adjacent magnetic cores is set narrower. A flow rate multistage control valve in which the interval between the annular flanges of the plunger that substantially opposes this end is set narrowly.