JPS6046308B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solenoid valve that can separately switch two flow paths using one solenoid valve.

A conventional solenoid valve has one inlet and one outlet,
A valve was provided between the inlet and the outlet, and the valve was opened and closed by turning on and off the current flowing through the coil.

Therefore, one solenoid valve was required for one flow path.
As described above, according to the conventional technology, since the current flowing through the coil is turned on or off, one solenoid valve must necessarily be provided in one flow path. Therefore, an object of the present invention is to provide a solenoid valve that can switch between two flow paths with one solenoid valve.

As a result of various studies, the inventor of the present invention found that, in addition to turning on and off the current flowing through the coil, the current was passed in the opposite direction to reverse the magnetic poles, thereby switching the two flow paths using a single solenoid valve. I discovered that.

The electromagnetic valve according to the present invention includes a casing surrounding the outer periphery of a coil, and a first valve that opens and closes communication between a first inlet and an outlet.
A sliding member made of a magnetic material is slidably provided inside the coil in the radial direction adjacent to the valve, and communication between the second inlet and the outlet is opened and closed adjacent to the sliding member. a second valve configured as a permanent magnet, the first valve member being capable of abutting the second valve member through a hole drilled in the head member thereof and a hole drilled in the sliding member; The coil has a foot portion, and is provided with a switch that allows forward and reverse current to flow through the coil in order to open and close the first and second valves, and also cuts off the current.

Since the first valve operated by a coil and the second valve constituted by a permanent magnet are combined in this way,
Three actions can be performed by passing a reverse current and cutting off the current.

Therefore, conventionally, two valves were required to switch between two flow paths, which was expensive, but by implementing the present invention, gate switching between two flow paths can be performed with one solenoid valve. It became possible.

Embodiments of the present invention will be described below with reference to the drawings.

The illustrated embodiment is used, for example, in a metered fuel supply system at a gas station.
A bypass passage B is provided in the main pipe M, and a passage O is provided in the main pipe M to open and close the main valve 24 provided in the main pipe M. When the target value is approached, the main valve 24 is closed, and the fluid is allowed to flow from the bypass passage B to reach a predetermined amount. This is the case when the bypass passage B is closed to perform highly accurate quantitative oil supply. Normally, in such a case, a solenoid valve must be provided in each of the passages 0 to open and close the bypass passage B and the main valve 24, but according to the present invention, these two
One solenoid valve can open and close two passages. In FIG. 1, the solenoid valve according to the present invention includes a casing 7 surrounding the outer periphery of a coil 6, a hollow head member 9 is provided in the upper part of the casing 7, and a lid is provided in the upper part of the head member 9. 8 is provided.

A first valve 5 is provided inside the head member 9, and a first valve member 5b having a valve portion 5c at the bottom is slidably provided. The valve member 5b is constantly pressed downward by the spring 10. The valve portion 5c is adapted to come into contact with a valve seat portion 5a formed inside the head member 9. A sliding member 11 made of a magnetic material is provided on the lower side of the head member 9 and inside the coil 6 in the radial direction.
is provided to be slidable in the vertical direction as shown in the drawing, and further below the sliding member 11 is a second valve member 2a made of a permanent magnet that constitutes the second valve 2, which can also be moved up and down as shown in the drawing. It is set up like this. The upward movement of this sliding member 11 is limited by the head member 9, and the downward movement thereof is limited by a non-magnetic stopper 5 provided inside the casing. A second inlet 1 and an outlet 3 from the bypass passage B are formed in the lower part of the casing 7, and the inlet 1 and outlet 3 are opened and closed by a second valve member 2a. A valve seat 2b of a second valve member 2a is formed in the bottom member 13 having an inlet 1 and an outlet I3.

The first valve member 5b is provided with a downwardly extending foot portion 14, which passes through a hole 15 formed in the head member 9 and a hole 16 formed in the sliding member 11, and the second
j valve member 2a. A first inlet 4 formed in the lid 8 and an outlet 3 formed in the bottom member 13
means that when the first and second valve members are open, the first
The flow path 17 of the second valve member 5b, the flow path 9a of the head member 9, the flow path 18 of the sliding member 11, and the flow path 19 of the second valve member 2a can communicate with each other. This first inlet 4 communicates with the channel 0 in the illustrated embodiment. The coil 6 is connected to a DC power source (not shown) via a forward switch 20 and a reverse switch 21.

In the figure, 23 is a flow meter, 25 is a diaphragm chamber 26, a pore 27 communicating the diaphragm chamber 25 and the main pipe M is a flow transmitter, and 28 is a preset device.

Similarly to the sliding member 11, the casing 7 and the head member 9 are also made of magnetic material. During operation, as shown in FIG. 2, when the positive switch 20 is closed and current is passed through the coil 6 in the positive direction, the lower side of the sliding member 11 has a magnetic pole of a different polarity than the upper side of the second valve member 2a. It is formed.

(N and S are illustrated in the drawing to make it easier to understand.)
Then, the sliding member 11 and the second valve member 2a are sucked upward, the second valve 2 opens, and the inlet 1 and the outlet 3 communicate with each other. At the same time, the foot portion 14 of the first valve member 5b is pushed upward by the second valve member 2a, so that the first valve member 5b moves upward against the spring 10, and as a result, the first valve member 5b moves upwardly against the spring 10. 5 opens. Therefore, the inlet 4 of the lid 8 communicates with the outlet 3 of the bottom member 13. Next, as shown in FIG. 3, when the positive switch 20 is opened, the coil 6 loses its magnetic force, so the spring 1
0, the first valve member 5b moves down and the valve 5 is closed, and the communication between the first inlet 4 of the lid 8 and the outlet 3 of the bottom member 13 is cut off. At this time, since the second valve member 2a is a permanent magnet, the second valve member 2a is attracted to the sliding member 11, and in the attracted state, the foot portion 1 of the first valve member 5b is
4, the sliding member 11 is held in contact with the shoulder 12. Therefore, in this state, bypass pipe B
is open, but passage 0 is closed (Figure 3). Then, as shown in FIG. 4, when the reverse switch 21 is closed, a current in the opposite direction flows through the coil 6, and the lower part of the sliding member 11
It has the same polarity as the upper part of the valve member 2a. Therefore, the second valve member 2a rebounds and moves downward, seats on the valve seat 2b, and becomes the second valve member 2a.
valve 2 is closed. Therefore, the inlet 1 and the outlet 3 are blocked. Then, when the reverse switch 21 is opened, the second
The closed state of the valve 2 is maintained and the state shown in FIG. 1 is returned. Next, the mode of oil supply when the solenoid valve according to the present invention is implemented in the oil supply apparatus as shown in the drawings will be explained.

As shown in the figure, the main pipe M is provided with a flow meter 23 and a main valve 24, the inlet of the main valve 24 and the inlet 1 of the solenoid valve are connected, and the outlet 3 of the solenoid valve and the outlet of the main valve 24 are connected. are connected.

The diaphragm chamber 25 of the main valve 24 and the inlet 4 are connected via a passage 0. Here, when the first and second valves 5 and 2 are open, a larger amount flows into the diaphragm chamber 25 through the thin tube 26 than flows out from the diaphragm chamber 25 to the outflow side of the main valve 24 via the electromagnetic valve. Design it so that the amount is smaller. The signal line of the flow rate transmitter 27 of the flow meter 23 is connected to the preset device 28.
The signal lines are connected to switches 20 and 21, respectively. Now, when the preset device 28 is set to a desired amount, the normal switch 20 is turned on, and the coil 6 is energized as shown in FIG. 2, and the first valve 5 and the second valve 2 are opened.

When the valve 2 opens, the fluid at the inlet of the main valve 24 flows through the valve 2 to the outlet side of the main valve 24. Further, by opening the valve 5, the fluid in the diaphragm chamber 25 flows to the outflow side of the main valve 24 via the valve 5 and the valve 2. Since the amount of fluid flowing out into the diaphragm chamber 25 through the thin tube 26 is larger than the amount flowing into the diaphragm chamber 25, the diaphragm chamber is compressed due to the pressure balance, and the main valve 24 opens and the fluid flows into the main pipe M at a large flow rate. flows. When the flow rate signal from the transmitter 27 of the flowmeter 23 is integrated and approaches the value set in the preset device, the signal from the preset device 28 opens the forward switch 20 and the valve 5
closes.

Then, the fluid in the diaphragm chamber 25 no longer flows out.
Since it flows into the diaphragm chamber 25 through the thin tube 26, the pressure in the chamber 25 becomes high, and the main valve 24 is closed. However, since valve 2 is open, a small amount of liquid will flow out through bypass passage B. When the set amount is reached, the reverse switch 21 is closed by a signal from the preset device 28, and the valve 2 is closed, so that the refueling ends. Then, the reverse switch 21 is opened and the state returns to the state shown in FIG. Therefore, during refueling work, the main valve is closed slightly before the set amount, and thereafter a small amount is supplied through the bypass pipe B, and the bypass pipe is closed at the set amount, so that extremely accurate refueling can be performed. As described above, when the solenoid valve according to the present invention is used, it is possible to separately open and close the main pipe M and the bypass pipe B with a single solenoid valve, and it can be used very suitably in this type of circuit.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an oil supply device embodying the present invention. Figure 2 is a sectional view showing where the main valve and bypass passage are open, Figure 3 is a sectional view where the main valve is closed and the bypass passage is open, and Figure 4 is a sectional view where the main valve and bypass passage are open. It is a sectional view showing both parts closed. 1... Inflow port, 2... Second valve, 2a... Second valve member, 3...
・Outlet port, 4... Inlet port, 5... First valve, 5b.
...Second valve member, 6...Coil, 7...Casing, 8...Lid, 9...Head member, 10...Spring, 1
1...Sliding member.

Claims (1)

[Claims] 1 A casing surrounding the outer periphery of a coil is provided, a first valve for opening and closing communication between a first inlet and an outlet is provided in the upper part of the casing, and a magnetic material is provided adjacent to the first valve. A second sliding member made of a permanent magnet is provided adjacent to the sliding member to open and close communication between the second inlet and the outlet. the first valve member has a foot portion capable of passing through a hole formed in the head member thereof and a hole formed in the sliding member and abuts against the second valve member; An electromagnetic valve characterized in that a switch is provided to allow forward and reverse currents to flow through the coil and to cut off the current in order to open and close the first and second valves.