JPH04312276A - Three-way solenoid valve - Google Patents

Abstract

PURPOSE:To realize a compact size of a three-way solenoid valve by incorporating a pilot valve mechanism. CONSTITUTION:A valve main body 1 is provided with an inflow port 2, the first outflow port 3, and the second outflow port 4, and since the first spring S1 is stronger than the second spring S2 and the third spring S3 when no current is fed to a solenoid coil 19, the first valve body 9 is opened in the condition the first pilot valve body 16 opens the first pilot valve port 13, while the second valve body 10 is closed in the condition the second pilot valve body 16 closes the second pilot valve port 14. When the current is fed to the solenoid coil 19, the opening and the closing conditions of the valve bodies 9, 10, 15, and 16 are just reverse to the above conditions.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-way solenoid valve used for hot water supply.

0002

[Prior Art] In FIG. 3, a port a1 is provided in a valve body a.
, a2, a3 are formed, and when electromagnetic coil b is energized, plunger c is attracted against coil spring d to bring valve body e into contact with valve seat f, thereby communicating ports a1 and a2, and when de-energized, As shown in FIG. 4, by bringing the valve body e into contact with the valve seat g using the coil spring d, the ports a1 and a
3 are connected.

By the way, in this structure, it is necessary to switch the valve body against the fluid pressure acting on the valve body, so it is necessary to increase the elasticity of the coil spring d and the attractive force of the electromagnetic coil b. However, there was a drawback that the solenoid valve became larger.

0004

SUMMARY OF THE INVENTION The present invention focuses on the drawbacks of the prior art, and aims to make the solenoid valve more compact by incorporating a pilot mechanism.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides an inlet, a first outlet, and a second outlet in a valve body, and a first valve chamber and a second valve chamber are connected to the inlet. Two valve chambers are provided, a first valve element for opening and closing a first valve port formed between an inlet and a first outlet in the first valve chamber is supported by a first diaphragm; A first pilot valve chamber is divided from the valve chamber, and the first pilot valve chamber and the first pilot valve chamber are separated from each other.
A pressure equalizing hole is provided between the pilot valve chambers, and a first pilot valve body that opens and closes a first pilot valve port formed in a first valve body in the first pilot valve chamber is biased in a valve closing direction by a third spring. A second valve element for opening and closing a second valve port formed between an inlet and a second outlet in the second valve chamber is supported by a second diaphragm. In contrast, a second pilot valve chamber is divided and a pressure equalizing hole is provided between the second valve chamber and the second pilot valve chamber, and a second pilot valve port formed in the second valve body is opened and closed in the second pilot valve chamber. A second pilot valve body is supported by a plunger in an electromagnetic mechanism and biased in the valve closing direction by a first spring, and one end of the valve body is in contact with the second valve body between the first valve port and the second valve port. An operating rod is provided, the other end of which passes through the first valve port and comes into contact with the first pilot valve element, and a second spring is provided between the operating rod and the first valve element. When the first spring presses the second spring and the third spring, the second pilot valve body of the plunger closes the second pilot valve port, and the second valve body closes the second valve port, and the operating rod closes the first pilot valve. When the valve body opens the first pilot valve port, the first valve body opens the first valve port, and when the solenoid coil is energized, the magnetic force pulls up the plunger biased by the first spring, thereby opening the second pilot valve. When the body opens the second pilot valve port, the second valve body opens the second valve port, and when the first pilot valve body closes the first pilot valve port, the first valve body opens the first valve port. Characterized by closing.

[0006]

[Operation] When the solenoid coil is de-energized, the first spring overcomes the elasticity of the second and third springs to close the second valve body and open the first valve body. A flow path to the first outlet is opened, and a flow path from the inlet to the second outlet is closed. When the solenoid coil is energized in this state, the plunger is attracted and the second pilot valve element opens the second pilot valve port, so the fluid in the second pilot valve chamber flows from the second pilot valve port to the second outlet. Since the amount of outflow from the second pilot valve port is larger than the amount of inflow from the pressure equalization hole, the pressure in the second pilot valve chamber becomes lower than that of the second valve chamber, and this together with the elasticity of the second spring via the operating rod causes The second valve body quickly operates to open the second valve port.

Then, the pressure on the first pilot valve element is released by the movement of the operating rod, and the third spring causes the first pilot valve element to close the first pilot valve port, so that the pressure in the first pilot valve chamber increases. Together with the elasticity of the third spring, the first valve body is quickly closed.

[0008]

[Embodiment] An inlet 2 is provided on one side of the circumferential surface of a tubular valve body 1;
A first outflow port 3 and a second outflow port 4 are formed on the opposite side, separated by a partition wall 1a. A first valve chamber R1 and a second valve chamber R2 are formed at both axial ends of the valve body 1. In the first valve chamber R1, a first valve body 9 that approaches and separates from a first valve seat 5a of a first valve port 5 formed between an inlet 2 and a first outlet 3 is supported by a first diaphragm 7. provided. A guide 9a is protruded from the first valve body 9 and slides into sliding contact with the inner surface of the first valve port 5. A sealed case 11 is provided outside the first diaphragm 7, and its outer peripheral portion 11a forms a step portion 1b.
The peripheral edge 7a of the first diaphragm 7 is held between the first diaphragm 7 and the first diaphragm 7. The closed case 11 is supported by a bottom cover 22, and the bottom cover 22 is fixed with bolts 23.

A first pilot valve chamber R3 is formed between the first diaphragm 7 and the case 11, and a first pilot valve port 13 is formed at the center of the first diaphragm 7 and the first valve body 9 in a superposed state. A pressure equalizing hole 24 is provided around the first valve chamber R1 and the first pilot valve chamber R3 to communicate with each other. 1st pilot valve chamber R3
A first pilot valve seat 13a is provided at the end of the first pilot valve port 13, and the first pilot valve seat 13a is provided at the end of the first pilot valve port 13.
The first pilot valve body 15 that approaches and separates from the airtight case 11
is slidably supported by a small cylinder portion 11a connected to the
It is constantly biased toward the first pilot valve seat 13a by the third coil spring S3 via the spring receiver 17.

In the second valve chamber R2, the inlet 2 and the second
A second valve body 10 is supported by a second diaphragm 8 and is provided to move toward and away from a second valve seat 6 a of a second valve port 6 formed between the outlet ports 4 . The second valve body 10 is provided with a protruding guide 10a that slides into contact with the inner surface of the second valve port 6. Second diaphragm 8
A sealed case 12 is provided on the outside of the
The peripheral edge portion 8a of the second diaphragm 8 is held between the step portion 1c and the step portion 1c. The sealed case 12 is fixed by a coil case 25 in an electromagnetic mechanism.

A second pilot valve chamber R4 is formed between the second diaphragm 8 and the sealed case 12, and a second pilot valve port 14 is formed at the center of the second diaphragm 8 and the second valve body 10 in a superposed state. Around the pressure equalizing hole 2
6 is provided to communicate the second valve chamber R2 and the second pilot valve chamber R4. A second pilot valve seat 14a is provided at the end of the second pilot valve port 14 in the second pilot valve chamber R4, and a second pilot valve body 16 that approaches and leaves the second pilot valve seat 14a is located at the end of the plunger 18. The pilot valve seat 14a is attached to the pilot valve seat 14a and is always biased toward the second pilot valve seat 14a by a first coil spring S1. Note that 19 is a solenoid coil, 20 is a plunger pipe connected to the sealed case 12, and 21 is a suction iron core.

Between the first valve body 9 and the second valve body 10, an operating rod 27 is movably supported by a sliding hole 1d of the partition wall 1a. The formed small diameter portion 27a passes through the first valve port 5 and comes into contact with the first pilot valve body 15, and the operating rod 27 is moved by a second coil spring S2 provided between the stepped portion 27b and the first valve body 9. It is biased toward the second valve body 10, and a communication hole 27c is formed on the second valve body 10 side to communicate the second pilot valve port 14 with the second outlet 4.

In the above configuration, FIG. 1 shows the state in which the solenoid coil 19 is not energized, the general hot water supply path from the inlet 2 to the first outlet hole 3 is open, and the bath hot water supply path from the inlet 2 to the second outlet hole 4 is opened. The road is blocked. In this case, the elasticity of the coil springs S1, S2, and S3 is S1 > S2 > S3 and S1 > S2
+S3, the coil spring S1 overcomes the elasticity of the coil springs S2 and S3 and the plunger 1
8. Push down the second diaphragm 8, second valve body 10, and operating rod 10 in the direction of the first valve chamber R1, so that the second valve body 10 comes into contact with the second valve seat 6a and flows into the second outlet 4. The flow path is closed, and the operating rod 27 pushes down the first pilot valve body 15, and the spring S2 pushes down the first valve body 9 and the first diaphragm 7, and the general water supply path leading to the first outflow hole 3 is opened. . At this time, the first and second pilot valve chambers R3 and R4 have the same pressure as the inlet 2 side through the pressure equalizing holes 24 and 26.

Next, when the solenoid coil 19 is energized, the plunger 18 is attracted and opens the second pilot valve port 14, so that the fluid in the second pilot valve chamber R4 flows into the second pilot valve chamber R4.
It flows from the pilot valve port 14 through the communication hole 27c of the operating rod 27 to the second outflow port 4, and since the outflow amount from the second pilot valve port 14 is larger than the inflow amount from the pressure equalization hole 26, the second pilot valve The pressure inside the chamber R4 is lower than that of the second valve chamber R2, and the second valve element 10 opens the second valve port 6 in conjunction with the elasticity of the second coil spring S2 via the operating rod 27. Further, the movement of the operating rod 27 releases the pressure on the first pilot valve body 15, and the third coil spring S3 releases the pressure on the first pilot valve body 15.
When the pilot valve body 15 is pushed up and closes the first pilot valve port 13, the pressure in the first pilot valve chamber R3 increases, and together with the elasticity of the third coil spring S3, the pressure in the first pilot valve chamber R3 increases through the first diaphragm 7. The valve body 9 rises and the first
This closes the valve port 5, which opens the flow path from the inflow port 2 to the second outflow port 4 and closes the flow path to the first outflow port 3 (FIG. 2).

In the state shown in FIG. 2, the solenoid coil 1
When the power to 9 is cut off, the state shown in FIG. 1 is returned to the state shown in FIG. 1 by the reverse operation.

[0016]

Effects of the Invention As described above, the present invention provides an inlet, a first outlet and a second outlet in the valve body, a first valve chamber and a second valve chamber continuous to the inlet; A first valve body for opening and closing a first valve port formed between an inlet and a first outlet in the first valve chamber is supported by a first diaphragm, A first pilot that partitions a pilot valve chamber and provides a pressure equalizing hole between the first valve chamber and the first pilot valve chamber, and opens and closes a first pilot valve port formed on a first valve body in the first pilot valve chamber. The valve body is biased in the valve closing direction by a third spring, and the second valve body opens and closes the second valve port formed between the inlet and the second outlet in the second valve chamber by the second diaphragm. A second pilot valve chamber is defined from the second valve chamber by the second diaphragm, and a pressure equalizing hole is provided between the second valve chamber and the second pilot valve chamber. 2
A second pilot valve element formed in the valve element for opening and closing a second pilot valve opening is supported by a plunger in an electromagnetic mechanism and biased in the valve closing direction by a first spring, and the first valve opening and the second valve are connected to each other. An operating rod is provided between the openings, one end of which abuts the second valve element, and the other end passes through the first valve port and abuts the first pilot valve element, and a second valve element is provided between the operating rod and the first valve element. A spring is provided, and when the solenoid coil is de-energized, the first spring presses the second spring and the third spring, so that the second pilot valve body of the plunger closes the second pilot valve port. When the second valve port is closed and the first pilot valve body is opened by the operating rod, the first valve body opens the first valve port, and when the solenoid coil is energized, magnetic force is applied to the first spring. By pulling up the biased plunger, the second pilot valve body opens the second pilot valve port.
The valve body opens the second valve port, and the first pilot valve body opens the first valve port.
Since the first valve body closes the first valve port when the pilot valve port is closed, the flow path switching operation of the valve body is speeded up while achieving a compact electromagnetic valve mechanism. Is possible.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in a non-energized state.

FIG. 2 is a cross-sectional view of the same as the above in an energized state.

FIG. 3 is a sectional view of a conventional example.

FIG. 4 is a sectional view of the same valve switching state.

[Explanation of symbols]

1 Valve body 2 Inflow port 3 First outflow port 4 Second outflow port 5 First valve port 6 Second valve port 7 First diaphragm 8
Second diaphragm 9 First valve body 10 Second valve body R1 First valve chamber R2 Second valve chamber R3 First pilot valve chamber R4
Second pilot valve chamber 13
First pilot valve port 14 Second pilot valve port 15 First pilot valve body 16
Second pilot valve body 18
Plunger 19 Solenoid coils 24, 26
Equalizing pressure hole 27 Operating rod S1 First spring S2 Second spring S3 Third spring

Claims (1)

[Claims] [Claim 1] The valve body has an inlet, a first outlet, and a second outlet.
A first valve having an outflow port, a first valve chamber and a second valve chamber continuous to the inflow port, and opening and closing a first valve port formed between the inflow port and the first outflow port in the first valve chamber. The body is supported by a first diaphragm, the first diaphragm defines a first pilot valve chamber from the first valve chamber, and a pressure equalizing hole is provided between the first valve chamber and the first pilot valve chamber. In the first pilot valve chamber, a first pilot valve body that opens and closes a first pilot valve port formed in a first valve body is biased in the valve closing direction by a third spring, and in a second valve chamber, an inlet and a second pilot valve are provided. A second valve body for opening and closing a second valve port formed between the two outlet ports is supported by a second diaphragm, and the second diaphragm partitions a second pilot valve chamber from the second valve chamber. A pressure equalizing hole is provided between the second valve chamber and the second pilot valve chamber, and a second pilot valve body that opens and closes the second pilot valve port formed in the second valve body in the second pilot valve chamber is operated by a plunger in an electromagnetic mechanism. The valve is supported and biased in the valve closing direction by a first spring, and has one end abutting the second valve body between the first valve port and the second valve port, and the other end passing through the first valve port. An operating rod that contacts the first pilot valve element is provided, and a second spring is provided between the operating rod and the first valve element, and the first spring presses the second spring and the third spring when the solenoid coil is not energized. As a result, when the second pilot valve body of the plunger closes the second pilot valve port, the second valve body closes the second valve port, and the operating rod causes the first valve body to close the second pilot valve port.
When the pilot valve body opens the first pilot valve port, the first valve body opens the first valve port, and when the solenoid coil is energized, the magnetic force pulls up the plunger biased by the first spring, thereby opening the second pilot valve. When the valve body opens the second pilot valve port, the second valve body opens the second valve port, and when the first pilot valve body closes the first pilot valve port, the first valve body opens the first valve port. A three-way solenoid valve characterized by closing.