JPS5888278A - Solenoid valve - Google Patents

Abstract

PURPOSE:To provide a solenoid valve which can be functioned both as a closing valve and an opening valve by forming two valve seats for closing and opening a flow path connected to one opening. CONSTITUTION:In case where an opening 15 is used for an inlet, and an opening 25 is used for an outlet, a solenoid valve functions as a constantly closing solenoid valve, and on the contrary, in case where the opening 15 is used for an outlet, and the opening 25 is used for an inlet, it functions as a constantly opening solenoid valve. When an electromagnetic coil 6 is excited, a plunger 8 is moved upward, so that a valve body 28 is brought into contact with a valve seat 9a, and a valve body 30 is separated from a valve seat 4a, which results in that the space between the opening 15 and the outlet 18 is opened, and the space between the opening 25 and the outlet 18 is closed up. The valve body 28 is pressed against the valve seat 9a by an internal spring 29 and pushed into the interior of the plunger 8 by the valve seat 9a to be kept in the state of pressure contact.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a universal solenoid valve that can function as both a normally closed type and a normally open type.

Conventionally, known solenoid valves include a normally closed solenoid valve as shown in FIG. 1 and a normally open solenoid valve as shown in FIG.

1 and 2, a cage ring 102 having an electromagnetic coil 101 has an inlet 103, an outlet 104 and an outlet 1.
05 is formed, and in the normally closed type shown in FIG.
A flow path 106 leading to a valve chamber 107 in the casing 102
A valve seat 108 is formed between the rL valve body 109 and the spring 1.
Since the valve is always seated on the valve seat 108 by the force of 13, the connection between the multiple flow path 106 and the valve chamber 107 is cut off. Therefore, the outlet 104 and the inlet 10 communicate with the valve chamber 107.
3 is closed at all times. The valve body 109 is fixed to a plunger 110, and when the electromagnetic coil 101 is excited, the plunger 110 is attracted and rises, and at that time, the valve body 109 also rises, and the flow path 106 and the valve chamber 10 are
Open the space between 7. Therefore, population 103 and exit 104
The space between the two is opened and communicated.

The casing 102 has a discharge passage 1 connected to the discharge port 105.
11 is formed, and the discharge passage 111 is connected to the plunger 110.
It opens into a space within the casing 102 that communicates with the valve chamber 107 at a position facing the end opposite to the valve body 109 . When the valve body 109 is seated on the valve seat 108, the discharge path Ill is open between the valve chamber 107 and communicates with the outlet 104, thereby discharging the fluid from the outlet 104 to the outside of the solenoid valve. can do. When the valve body 109 is separated from the valve seat 108 by the excitation of the electromagnetic coil 101, the sliding valve 112 protruding from the end of the plunger 110 on the opposite side from the valve body 109 closes the discharge passage Ill. (Accordingly, when the inlet 106 and the outlet 104 communicate, the outlet 105 is closed.

The normally open type electromagnetic valve shown in FIG. 3 is structurally different from the normally open type shown in FIG. 2 in that the plunger 110 is turned over and the mounting position is changed from the top to the bottom in the figure. Normally, the discharge passage 111 leading to the discharge port 105 and the valve chamber 1
By seating the valve element 109 on the valve seat 108 provided between the outlet 105 and the outlet 105 by the force of the spring 113',
The space between the inlet 103 and the valve chamber 107 is closed, while the space between the flow path 106 leading to the population 103 and the flow path 114 leading to the outlet 104 which is open to the space leading to the valve chamber 107 is open. and the outlet 104 are in communication.

When the electromagnetic coil 101 is energized and the plunger 110 is attracted and moved downward against the force of the spring 113', the sliding valve body 112, which is slidably attached to the plunger 110 and whose end protrudes, is moved. The 10 end of the channel 106 is closed, and the space between the inlet 103 and the outlet 104 is closed. At this time, valve seat 1
08 is opened, so the outlet 104 and the discharge port 105 communicate with each other.

As shown in FIGS. 1 and 2, a normally closed solenoid valve and a normally open solenoid valve have different structures and must be manufactured separately. Attempts have been made to use a single solenoid valve as both a normally open type and a normally closed type, but in this case, it is necessary to rearrange or replace each part and sealing member within the solenoid valve, which is a disadvantage in that it is very time consuming. was there.

An object of the present invention is to provide a universal solenoid valve that can be used as both a normally closed type and a normally open type, and does not require rearrangement or replacement of parts.

The present invention includes an electromagnetic coil, a silanger that can be attracted and moved by the excitation of the electromagnetic coil, and two silangers that are slidable inside the plunger and are provided one at each end of the plunger.
a valve body, an internal spring provided between the two valve bodies and applying a counter pressure greater than the fluid pressure acting on the valve body, and first and second valve bodies provided opposite to each other at both ends of the plunger. It has two valve seats and a closing spring that presses the plunger to a position away from the suction position by the electromagnetic coil and seats one valve body on one valve seat, and the other valve seat is held by the electromagnetic coil. The other valve seat is positioned such that the other valve seat is seated in the suction position of the plunger, and the two valve seats are each formed for opening and closing a flow path connected to one port, and both valve seats in the casing are This was achieved by forming a solenoid valve whose outlet communicated with a valve chamber formed in between.

According to the present invention, one of the two ports individually connected to the valve seat is used as an inlet and the other is used as an outlet, and by simply switching the connection between the two, the normally-closed solenoid valve and the demand-controlled solenoid valve can be tilted. It can be used for. In other words, just by switching the conduit connections, 1
The two solenoid valves can be used in both normally open and normally closed types without any modification, and a suitable universal solenoid valve has been obtained.

An embodiment of the present invention will be described from one side.

In FIG. 3, the first valve seat member 4 with the seal ring 3 attached to the end face is fitted into the small-diameter first hollow part 2 of the casing l, and then the tip sleeve part 5α of the inner casing 5 is fitted into the first hollow part 2. Then, the first valve seat member 4 is pressed and fixed to the casing 1. In the first valve seat member 4, an electromagnetic coil 6 is provided on the outer periphery of a guide portion 5b following the sleeve portion 5a of the inner casing 5, which may be integrally formed with the casing l. The inner circumference of the guide portion 5b is smaller than the inner diameter of the sleeve portion 5a, and a stepped connecting portion 5G is formed therebetween, which acts as a spring seat for the closing spring 7. The plunger 8 is inserted into the guide portion 5b so as to be slid and guided, and the second valve seat member 9 and the first valve seat member 4 sandwich the grunger 8 at a slight interval. It is inserted in such a way that it is locked and fixed by a stopper member 1o provided in the internal poppy song 5. A frame portion 5d of the inner casing 5 formed to surround the electromagnetic coil 6 and the stopper member 10 is housed in the large-diameter second hollow portion 11 of the casing l, and is fixed within the casing l by a lid 12.

A recess 13 is formed as a fluid chamber in a portion of the casing 1 that is in contact with the end surface of the first valve seat member 4, and is connected to a first port 15 formed in the casing 1 through a flow path 14. 1st
The valve seat member 4 has a flow path 4b that is open at the end forming the first valve seat 4α and is connected to the four portions 13.

Through hole 1 formed in sleeve 5α of inner casing 5
6 and a flow path 17 formed in the casing 1, which communicates with an outlet 18 formed in the casing 1 and a valve chamber 19 formed in the sleeve 5a.

A bridging member 21 having a groove that forms a flow path 2o between M12 and M12 is embedded in the end of the internal casing 5, and connects the flow path 23 formed in the second groove 5. Internal casing 5
A flow path 2 formed in the casing 1 that communicates with a flow path 23 of
4 connects between the flow passage 22 of the second valve seat member 9 and the 2025th part of the casing l.

A second valve seat 9a is formed at the end of the second valve seat member 9, and the flow path 22 opens at the second valve seat 9α.

An opening 26 large enough for the second valve seat 9μ to enter is formed at one end of the plunger 8, and a hollow portion 27 with a larger diameter than the opening 26 is in communication with the opening 26 inside the plunger 8. Furthermore, the plunger 8 is formed to be open at the other end. A second valve body 28 is loosely fitted into the hollow portion 27, and an internal spring 29 is further inserted. A first valve body 3o having a larger diameter than the hollow portion 27 is fixed to the end of the plunger 8 to a resin cap 31 which is attached and fixed to the end of the plunger 8.

The resin cap 31 has a hole 32 into which the first valve seat 4a can fit.
and a housing hole 33 that communicates with the crest hole 32 and tightly accommodates the first valve body 30, and an annular leg that is fitted onto the outer periphery of the small diameter neck portion 8a formed at the end of the plunger 8 on the side of the first valve body 3o. It has a section 34. An annular stop projection 35 is formed on the inner periphery of the annular leg portion 34, and the stop projection 35 projects into an annular recess 36 formed in the neck portion 8α and is fixed. The annular protrusion 35 is inserted into the recess 36
When entering, the elastic expansion of the resin legs 35 is utilized. A flange portion 37 is formed on the outer periphery of the end of the cap 31 facing the first valve seat 4a, and the flange portion 37 acts as a spring seat for the closing spring 7.

The operation of this solenoid valve will be explained.

Normally, the first valve body 30 is closed to the first valve seat 4 by the force of the closing spring 7.
α is pressed to close the space between the valve chamber 19 and the flow path 46, that is, the first port 15, and at this time the second valve body 28 and the second valve seat 9α
A gap is opened between them. This allows the passage 2 of the second valve seat member 9 to
2, i.e. the 2025th guide part 5 of the inner casing.
A plurality of grooves 37 formed on the inner surface of b open the space between the valve chamber 19 communicating with the outlet 18.

When using No. 1015 as an inlet and No. 2025 as a discharge port, use the valve as a normally closed solenoid valve, and use the first port 15 as a discharge port.
When the 2025th port is used as an inlet, it acts as a normally open solenoid valve.

When the electromagnetic coil 6 is excited, the plunger 8 moves upward in the figure against the force of the closing spring 7 due to the magnetic attraction force. The closing spring 7 is set to apply enough force to prevent the first valve seat 4a'iz from being pushed and moved by the pressure in the flow path 4b when the first valve seat 4a'iz is closed.

Due to the movement of the granger 8, the second valve body 28 is moved to the second valve seat 9.
α, and the first valve body 30 separates from the first valve seat 4a.

As a result, the space between No. 1015 and the exit 18 is opened, and the second
025 and the exit 18 are closed. The second valve body 28 is pressed against the second valve seat 9α by an internal spring 29 stretched between it and the first valve body 30 fixed to the plunger 8.
The valve seat 9a maintains the pressure contact state since it is not pushed into the inside of the cipher/jar 8. The internal spring 29 is set to a strength capable of resisting the fluid pressure that tends to flow toward the second valve body 28 through the flow path 22 and presses and holds the second valve body 28 against the second valve seat 9α. .

The solenoid valve according to the present invention can be used as a normally closed solenoid valve by simply selecting which of the 10th and 20th ports to connect to the inlet and which to connect to the outlet without making any changes to the parts or sealing members. It can also be used as a normally open type JL solenoid valve, resulting in the desired universal solenoid valve.

Although the description of the seal portion is omitted in the explanation of the figures, it is normal that the necessary portions are sealed with a seal ring or the like. Providing the 10th and 20th sections close to each other has the advantage of facilitating connection switching.

The force of the internal spring is set to be large enough to overcome the fluid pressure, so a large force is required for the attraction force exerted on the electromagnetic coil. Therefore, if the plunger is reciprocated at a position as close as possible to the attraction position, there is no need to particularly increase the excitation force of the electromagnetic coil itself.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional normally closed solenoid valve, and FIG. 2 is a sectional view of a universal solenoid valve. l...Casing 4...First valve seat member 4α・
...First valve seat 6...Solenoid coil 7...Closing spring 8...Plunger 9...Second valve seat member 9a...Second valve seat °15...10th
18...Outlet 19...Valve chamber 25-1.
No. 2028...Second valve body 29...Internal spring 30...First valve body

Claims (1)

[Claims] (1) An electromagnetic coil provided in a casing, a plunger slidably provided inside the electromagnetic coil, and a plunger capable of sliding inside the plunger and being latched to one end of the plunger. a second valve body inserted, an internal spring inserted so as to be in contact with the second valve body, a first valve body fixed to the other end of the plunger and compressing the internal spring, and a first valve body of the plunger. a first valve seat fixedly disposed within the casing opposite to the second valve seat; a second valve seat fixedly disposed within the casing opposing the second valve body of the plunger; a closing spring stretched between the plunger and the casing so as to press the first valve seat against the casing;
A second valve seat at the mouth communicates with the casing, a valve chamber formed in the casing between the first valve seat and the second valve seat communicates with the outlet, and a closing spring communicates with the first valve body. A solenoid valve characterized in that the spring force is set such that the internal spring exerts a pressure greater than the fluid pressure acting on the second valve body.