JPH0135989Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve that automatically switches fluids. More specifically, the present invention relates to a valve that reduces power consumption for operating the valve and can be made smaller.

As a prior art related to the present invention, there is the one shown in FIG. 1 (Swiss Patent No. 584861). FIG. 1 shows a three-way solenoid valve, and 51 is a casing. The casing 51 includes a cylindrical empty valve chamber 55, a first port 52 communicating with the valve chamber 55, and a second port 53.
and a third port 54. In addition, in the valve chamber 55 of the casing 51, a first valve seat 57 is placed on the first port 52 side, and a second valve seat 58 is placed on the third port 54 side, so that they are arranged on both sides in the axial direction. It is set in. A disc-shaped valve body 6 made of a rubber-like elastic material is provided in the valve chamber 55.
0 is arranged so as to be movable in the axial direction.

Furthermore, a movable iron core 61 is arranged on the side of the casing 51 opposite to the valve chamber 55. This movable iron core 6
There are two protruding push rods 6 on the tip side of 1.
Two holes 66 are provided on both sides of the first port 52 and pass through to the valve chamber 55 side without communicating with the first port 52. is inserted.
Furthermore, the movable iron core 61 is pushed against the valve body 6 by the spring means 63.
It is pressed in the 0 direction. In the conventional technology configured in this way, only the spring means 63 is connected to the movable iron core 6.
1, the push rod 62 presses the valve body 60 against the second valve seat 58 to close the third port 54. Next, when the movable iron core 61 returns to the first valve seat 57 side against the spring means 63 due to the excitation of the solenoid 65, the valve body 60 is moved to the first valve seat 57 by the fluid pressure introduced from the third port 54. Move into sealing contact with valve seat 57. Then, the first port 52 is closed so that no fluid flows. Due to this action, the valve body 60 cooperates with the first valve seat 57 or the second valve seat 58 to form an on-off valve. In this on-off valve, the first port 52, the second
In order to allow fluid to flow into and out of the port 53 and the third port 54, from the relationship of fluid resistance,
The surface of the valve body 60 and the first and second valve seats 5
7 and 58 must be provided to a certain extent or more. Further, if the gap between the circumferential surface of the valve body 60 and the inner circumferential surface of the valve chamber 55 is not provided to a certain extent, fluid flow will be hindered. For this reason, the valve body 60 is located on the second valve seat 5 with respect to the first valve seat 57.
8 and the gap between the inner circumferential surface of the valve chamber 55 and the outer circumferential surface of the valve body 60 are formed at a certain distance or more. As a result, the stroke of the movable core 61 must be increased. This increase in the stroke of the movable iron core 61 has the disadvantage of requiring consumption of excitation current proportional to the square of the stroke. Furthermore, strengthening the excitation of the electromagnet requires increasing the size of the solenoid, which also has the drawback of increasing the size of the entire valve. Also valve body 6
Since the push rod 62 is made of rubber material and is installed in the valve chamber 55 with a free space, the push rod 62
When the valve body 60 is pressed against the second valve seat 58, the valve body 60 is deformed, making it difficult to seally close the valve, and the fluid pressure from the third port 54 causes the valve body 60 to close against the first valve seat 57. Even when the valve is opened, it is important to close it in a sealed manner. Also, since the valve body 60 has a gap in the radial direction, both valve seats 57,
58, the contact surface deviates in the radial direction, resulting in unstable valve closing.

The present invention was developed in view of the above-mentioned problems, and its purpose is to reduce the stroke of the movable iron core so as to reduce the power consumption of the solenoid.

Therefore, the present invention is constructed as follows.

That is, a solenoid, a movable core disposed movably relative to the solenoid and having a push rod at its tip, a first spring means elastically pressing the movable core toward the push rod, and movable in a direction opposite to the movable core. a second spring means having a spring constant smaller than that of the first spring means that elastically presses the pressing member toward the push rod; a movable iron core; A valve body having a receiving part disposed between the push rod and the push part at a position where it comes into contact with the push rod, a rotatable fulcrum on one side of the receiving part, and valve parts on both sides of the other side, and each valve body. Each valve seat body is provided with a flow path having a valve seat at a position forming an on-off valve with the valve part, and when the solenoid is energized, the movable iron core is attracted to the solenoid side and at the same time the push part of the pressing member is moved to the receiving part. is pressed to close one valve part to one valve seat and open the other valve part to the other valve seat. When the solenoid is de-energized, the movable iron core moves toward the valve body and the push rod is closed. By pressing the receiving part, one valve part opens from one valve seat and the other valve part closes from the other valve seat.

The present invention configured as described above has the following unique effects.

The valve body is rotatably supported at one end and has a receiving part in the middle, and valve parts are provided on both sides of the other end, so when it rotates about the fulcrum, the distance traveled by the receiving part is longer than the distance traveled by the receiving part. The moving distance of the valve part increases. As a result, even if the moving distance of the movable core is reduced,
Since the opening distance between the valve part and the valve seat is increased, it becomes possible to reduce the resistance of fluid passing between the valve part and the valve seat.

Since the distance from the fulcrum to the receiving part can be set smaller than the distance from the fulcrum of the valve body to the valve part, it is possible to reduce the moving distance of the movable iron core, improving the switching response of the valve. Become good.

Since the valve body is forcibly rotated by the movable iron core and the pressing member on both sides of the valve body to open and close the valve seat, the sealing of the joint surface between the valve portion and the valve seat is ensured.

Since the moving distance of the movable core is small, the suction capacity of the movable core can be reduced, and the shape of the entire valve can also be made smaller.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the drawings. FIG. 2 is a cross-sectional view of the main parts of the valve of the present invention. 1 is the valve case, case 1
An excitation coil 2 with a coil wound therein is arranged,
An electromagnet 3 is provided on the inner circumferential side of the solenoid 1.
0 is formed. The movable iron core 4 is provided with two protruding push rods 7 at its tip and is disposed within the solenoid 10 so as to be movable in the axial direction. Furthermore, the movable iron core 4 is pressed toward the push rod 7 by a first spring means 5 arranged on the push rod 7 side of the movable iron core 4.

Further, a valve body 9 is provided on the push rod 7 side of the movable iron core 4. This valve body 9 includes a T-shaped valve body portion 12 and a valve body portion 1 made of a rubber-like elastic material when viewed from the side.
It consists of a support rod 13 assembled to 2.
Further, reinforcing members 14 are assembled above the first valve part 8 and the second valve part 8' extending on both sides of the valve body part 12.
The lower side has a first valve surface and a second valve surface that are sloped. The fulcrum 6 of the support rod 13 is supported by a frame 20 fixed to the case 1 side,
It is rotatable in the moving direction of the movable iron core 4.

In addition, two protruding push portions 16 are provided on the tip side so as to face the push rod 7 of the movable iron core 4.
A pressing member 18 having a pressure member 18 is disposed opposite to the movable core 4 side of the valve body 9 so as to be freely movable in the axial direction. This pressing member 18 is pressed in the direction of the push rod 7 by a second spring means 17 whose pressing force is smaller than that of the first spring means 5.

Further, a first valve seat body 21 and a second valve seat body 2 are fitted and fixed to the case 1 and are arranged on both sides of the valve body 9.
1' has flow passages 23, and the end ports of each flow passage 23 are formed into a first valve seat 24 and a second valve seat 24'. An end cover 26 is provided on the end side of the case 1.
A pressing rod 19 is provided so that the pressing member 18 can be pressed manually. Also, case 1
A fluid passage 27 communicating with the inside of the valve body 9 is provided in the valve body 9 .

The embodiment of the present invention constructed as described above operates as follows. The electromagnet 3 is excited by the exciting current flowing through the solenoid 10, and the movable iron core 4 is attracted by the electromagnet 3 against the first spring means 5. As a result, the push rod 7 releases its pressure on the receiving portion 11, so that the valve body 9 is pressed in the direction of the movable iron core 4 by the push portion 16 of the pressing member 18. Then, the first valve part 8 closes on the first valve seat 24, and the second valve part 8'
The valve opens from the second valve seat 24'. Next, when the electromagnet 3 releases the movable core 4 from its attracted state, the first spring means 5 causes the movable core 4 to move toward the valve body 9.
Since the push rod 7 of the movable iron core 4 pushes back the pressing member 18 via the receiving part 11,
The valve body 9 is pressed toward the pressing member 18 side. the result,
The second valve part 8' closes on the second valve seat 24', and the first valve part 8 opens from the first valve seat 24.

Therefore, since the valve body of the present invention is configured such that the receiving part, which has a fulcrum at an intermediate distance between both valve seats, is pressed by a push rod or a pressing member, the valve opening distance between the valve part and the valve seats is On the other hand, the moving distance of the movable core can be reduced. As a result, the attraction force of the electromagnet can be made stronger in inverse proportion to the square of the distance, so the excitation coil side can be made smaller, and the valve can be opened widely with a small movement distance of the movable iron core 4. Since the valve is forcibly closed, sealing is ensured.

Furthermore, since the first and second valve seat bodies 21 and 21' are fitted and fixed to the case 1, by replacing them with valve seat bodies 21 and 21' whose flow passages 23 have different diameters,
It becomes possible to easily change the flow rate. In addition, the positioning of the respective valve parts 8, 8' and the corresponding valve seats 24, 24' to be connected is performed by positioning the valve seat bodies 21, 21' in the case 1.
Since it can be easily set when push-fitting the valve body 9 and the valve seat body 21, this positioning becomes easy.
The machining and assembly accuracy of 21' can be lowered.

FIG. 3 shows an example in which the valve body 9 is made of rubber or resin-like elastic material in the embodiment shown in FIG.
A metal receiving part 11 and a fulcrum 6 are assembled in the form of a rod. Further, each valve seat body 21, 21' is inclined in a direction in which the valve seats 24, 24' sides face each other to ensure the connection between each valve part 8, 8' and each valve seat 24, 24'. It is something.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a conventional valve, FIG. 2 is a cross-sectional view of a valve according to one embodiment of the present invention, and FIG. 3 is a partial cross-sectional view of a valve according to another embodiment. DESCRIPTION OF SYMBOLS 1... Case, 2... Excitation coil, 3... Electromagnet, 4... Movable iron core, 5... First spring means, 6
...Fully point, 7...Push rod, 8...First valve part, 8'...Second valve part, 9...Valve body, 10...
... Solenoid, 11 ... Receiving part, 12 ... Valve body part,
13... Support rod, 14... Reinforcement material, 16... Push portion, 17... Second spring means, 18... Pressing member, 19... Extrusion rod, 20... Frame, 21
...First valve seat body, 21'...Second valve seat body, 2
3...Flow path, 24...First valve seat, 24'...
Second valve seat, 26... End cover, 27... Fluid passage, 51... Casing, 52... First port, 53... Second port, 54... Third port, 55... Valve chamber, 57...First valve seat, 58...Second valve seat, 60...Valve body, 61...Movable iron core, 62...Push rod, 63...Spring means, 65...Solenoid, 6
6...hole.

Claims (1)

[Scope of utility model registration request] a solenoid 10, a movable core 4 disposed movably relative to the solenoid 10 and having a push rod 7 at its tip, a first spring means 5 for resiliently pressing the movable core 4 toward the push rod 7; A pressing member 18 is disposed to be movable in a direction facing the movable iron core 4 and has a push portion 16 at its tip, and the pressing member 18 is resiliently pressed toward the push rod 7 side, and is pressed more than the first spring means 5. a second spring means 17 with a small spring constant;
The push rod 7 and the push portion 1 are disposed between the movable iron core 4 and the push member 18.
a valve body 9 having a receiving portion 11 at a position where it abuts the receiving portion 6, a rotatable fulcrum 6 on one side of the receiving portion 11, and valve portions 8, 8' on both sides of the other side; Valve seats 24 and 2 are located at the end of each flow path at positions that form on-off valves with each valve portion 8 and 8', respectively.
4' is formed in each valve seat body 21, 21'.