JPH0140389Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a poppet type direct-acting solenoid valve.

Conventionally, as shown in FIG. 1, an input orifice 2 communicating with an input port 1 and a discharge orifice 4 communicating with a discharge port 3 are formed in a back-to-back state, and a valve body 7 is disposed opposite to these orifices 2 and 4. , 8 which are opened and closed directly by a movable iron core 5 and a push rod 6 of an electromagnetic operating section are known from US Pat. No. 3,303,854. In the solenoid valve,
If the diameter of the discharge orifice 4 is d ₁ , its flow path cross-sectional area S ₁ and the stroke of the valve body 8 required to open and close it are
a ₁ , and the acting force F ₁ on the valve body 8 due to the fluid pressure P ₁
is expressed by the following formula.

S ₁ = π/4d ² ₁ ...(1) a ₁ = 1/4d ₁ ...(2) F ₁ = S ₁・P=π/4d ² ₁・P ...(3) Now, discharge orifice 4 distribution capacity in 2
If you want to double the flow path cross-sectional area S ₁ , it is necessary to double the flow path cross-sectional area S 1 , and therefore the diameter d ₁ of the discharge orifice 4
must be expanded as follows. That is, if the diameter of the enlarged discharge orifice is d ₂ , then 2S ₁ = π/4d ² ₂ ...(4), so from equations (1) and (4) above, 2・π/4d ² ₁ = π/4d ² ₂ ∴d ₂ =√2d ₁ ...(5) On the other hand, the stroke a ₂ of the valve body 8 required to open and close the enlarged discharge orifice is calculated from equations (2) and (5) above by a ₂ = 1/4d ₂ = √2/4d ₁ = √2a ₁ .

Furthermore, the acting force F ₂ on the valve body due to the fluid pressure P
From the above equation (3), F ₂ = S ₂ · P = 2S ₁ · P = 2F ₁ , which increases to twice the conventional value. Therefore, the return spring for movable core that overcomes the acting force F ₂ The biasing force of 9 must be increased accordingly, and the electromagnetic force will also inevitably increase.

That is, in the above-mentioned conventional solenoid valve, an increase in the flow capacity immediately leads to an increase in the stroke of the valve body, an increase in the return spring, and an increase in the electromagnetic force, making it impossible to avoid an increase in the size of the entire solenoid valve. It was hot.

The object of the present invention is to increase the flow capacity without increasing the stroke of the valve body or increasing the strength of the return spring.

In order to achieve the above object, the present invention provides an input orifice between the input port and the output port, and also provides two discharge orifices between the output port and the discharge port, and these orifices are arranged coaxially. A poppet-shaped valve body, which is driven directly by a movable iron core of an electromagnetic operation part, is installed in each orifice, and the two discharge orifices can be opened and closed with a time difference from each other. .

In the solenoid valve of the present invention having the above configuration, the input orifice and the two discharge orifices are alternately opened and closed by driving the valve body by the movable iron core, and the input port and the output port, and the output port and the discharge port, respectively. It will be rejected.

In addition, by providing two discharge orifices, the cross-sectional area of the flow path is expanded and the flow capacity is increased. For example, the diameter of the two discharge orifices is
(=d ₁ ), their total flow path cross-sectional area S
is S=π/4(d ² +d ² )=π/2d ² ₁ =2S ₁ , which is twice the conventional value.

On the other hand, the stroke a of the valve body required to open and close the two discharge orifices is a = 1/4d = a ₁ , and these discharge orifices are arranged coaxially so that each valve body has a common movable iron core. Since the discharge orifice is opened and closed by the valve body, it is possible to open and close both discharge orifices with the same valve body stroke as in the conventional valve body.

Furthermore, the total acting force F on the two valve bodies due to the fluid pressure P is F=2・π/4d ²・P=2F ₁ , but since both discharge orifices are opened with a time difference. Therefore, the biasing force of the return spring for the movable core should be set to be large enough to overcome the force F/2 (=F ₁ ) acting on the valve body that initially opens. Once the discharge orifice is opened, the other valve body is also opened by the return spring because the fluid pressure decreases.

As described above, according to the present invention, by providing two discharge orifices and arranging them coaxially, the flow capacity can be increased without increasing the opening/closing stroke of the valve body and the biasing force of the return spring. I can do it.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In FIG. 2, 10 indicates a valve section, 11 indicates an electromagnetic operating section, and the valve body 1 in the valve section 10 is
2 is provided with an input port 13, an output port 14, and a first discharge port 15, and a fixed iron core 16 in the electromagnetic operation section 11 is provided with a second discharge port 17.

The input port 13 has an electromagnetic chamber 18.
An input orifice 19 opening inward is connected, and a first discharge port 15 and a second discharge port 17 are connected to each other.
A first discharge orifice 21 opens opposite to the input orifice 19 in the valve chamber 20 communicating with the output port 14, and a second discharge orifice opens opposite to the input orifice 19 in the electromagnetic chamber 18. 22, and these orifices 19, 21, 22 are arranged coaxially, and the electromagnetic chamber 18 and the valve chamber 20 communicate with each other via the through hole 23 or a hole provided in parallel thereto. By doing so, the input port 13 and the output port 14 are made to communicate with each other via the input orifice 19, and the output port 14 and the first and second
The discharge ports 15 and 17 are communicated with each other through first and second discharge orifices 21 and 22.

Further, a return spring 2 is provided inside the electromagnetic chamber 18.
A movable iron core 24 energized by 5 is disposed, and an input valve body 26 for opening and closing the input orifice 19 and a second discharge valve body 27 for opening and closing the second discharge orifice 22 are disposed inside the movable core 24, respectively. spring 28,
29, the valve is biased toward the valve closing direction, and on the other hand,
Inside the valve chamber 20, a first discharge orifice 2 is provided.
A first discharge valve body 30 that opens and closes the first discharge valve body 3 is disposed so as to be biased in the valve closing direction by a spring 31.
0 and the movable iron core 24 are communicated with each other by the rod 32 inserted through the through hole 23, and thereby,
When the movable core 24 is attracted to the fixed core 16, the input orifice 19 is opened and the first and second discharge orifices 21, 22 are closed, and when the movable core 24 is not attracted, the input orifice 19 is closed and the first, second discharge orifices 21, 22 are closed. The second discharge orifices 21 and 22 are configured to open. Then, the opening/closing strokes a and a' of the first and second discharge valve bodies 30 and 27 are set in a relationship such that a>a' or a<a', and both orifices 2
1 and 22 are opened and closed at different times.

Note that 33 in the figure is a coil.

In the solenoid valve having the above configuration, when the coil 33 is energized from the state shown, the movable core 24 is attracted to the fixed core 16, the input orifice 19 opens, and the first and second discharge orifices 2
1 and 22 are closed, and the input port 13 and the output port 14 communicate with each other via the electromagnetic chamber 18, the through hole 23, and the valve chamber 20.

When the energization is cut off, the movable core 24 returns to the illustrated state due to the biasing force of the return spring 25, the input orifice 19 closes, and the first and second discharge orifices 21 and 22 open, opening the output port 14 and the The first and second discharge ports 15 and 17 communicate with each other. In this case, if the strokes a and a' of the two discharge valve bodies 30 and 27 are set to the relationship a<a', first,
After the second discharge orifice 22 is opened, the first discharge orifice 21 is opened, and the pressure fluid from the output port 14 is discharged from the discharge ports 15 and 17 via these discharge orifices 21 and 22.

Then, as mentioned above, two discharge orifices 2 are installed.
1 and 22 on the same axis, compared to a conventional solenoid valve having only one discharge orifice, the opening/closing stroke of the discharge valve bodies 30 and 27 and the return spring 25
The distribution capacity can be increased without any increase in the biasing force of the system, and this is clear from the explanation at the beginning.

In the embodiment shown in FIG. 3, a second input orifice 35 communicating with the input port 13 via a branch hole 34 is provided in the solenoid valve having the above-described structure, and the second input orifice 35 is connected to each of the orifices 19, 21, 22. It is placed coaxially with.

Incidentally, since the other structures are the same as those shown in FIG. 2, the same parts are given the same reference numerals and the explanation thereof will be omitted.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional example, and FIGS. 2 and 3 are sectional views showing different embodiments of the present invention. 11...Electromagnetic operation unit, 13...Input port, 1
4... Output port, 15, 17... Exhaust port,
19... Input orifice, 21, 22... Discharge orifice, 24... Movable iron core, 26, 27, 30
... Valve body.

Claims (1)

[Scope of utility model registration request] An input orifice is provided between the input port and the output port, and two discharge orifices are provided between the output port and the discharge port. 1. A poppet-type direct-acting solenoid valve, characterized in that poppet-type valve bodies that are directly driven by the valves are arranged opposite each other, and the two discharge orifices can be opened and closed with a time difference from each other.