JP2685732B2 - Pilot kick type solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot kick capable of driving a main valve body by adjusting a pressure in a valve chamber by driving a movable iron core equipped with a pilot valve body even if a solenoid having a small magnetic force is generated. Type solenoid valve.

[0002]

2. Description of the Related Art Conventionally, there has been used a pilot kick type solenoid valve in which only a pilot valve element is driven by a magnetic force of a solenoid and a main valve is opened / closed by adjusting pressure in a valve chamber. FIG. 3 is a sectional view showing a conventional pilot kick type solenoid valve. This pilot kick type solenoid valve 51
A valve seat 55 is formed so as to project from the output port 52 to the input port 53 side in a cylindrical shape, and a main body 56 having a space for the valve chamber 54 is formed therein, and a solenoid 57 is provided above the main body 56.
Is provided. The main body 56 and the solenoid 57 are coaxially formed with a cylindrical hole, and the main valve body holding member 58,
The movable iron core 59 and the fixed iron core 60 are inserted.
The main valve body holding member 58 has a main valve body 61 corresponding to the valve seat 55.
Is fitted and a pilot hole 62 is formed so as to penetrate the shaft center. On the other hand, the movable iron core 59 is connected to the main valve body holding member 5.
8 is pin-coupled to the upper part, and the pilot hole 6 is at the lower end.
A pilot valve body 63 for opening and closing 2 is fitted. The movable iron core 59 is provided with a spring 64 between the movable iron core 59 and the fixed iron core 60 so as to be urged downward.

In the pilot kick type solenoid valve 51 having such a structure, when the renoid 57 is energized, a magnetic field is generated to oppose the biasing force of the spring 64 so that the movable iron core 59 contacts the upper fixed iron core 60. Rise. At this time, the fluid flows out to the output port 52 through the pilot hole 62 due to the rise of the movable iron core 59. Therefore, the movable iron core 59 pulls up the main valve body holding member 58 via the pin, and the main valve body holding member 58 is pushed up by the pressure difference generated between the pilot valve chamber 65 and the valve chamber 54, and the main valve body holding member 58 is pushed up. The valve 61 is opened by being separated from the valve seat 55.

[0004]

In such a pilot kick type solenoid valve 51, the magnetic force generated by the solenoid 57 raises the movable iron core 59, but when it is driven by a solenoid having a small generated magnetic force. In order to obtain high magnetic efficiency, the movable iron core 59 is inevitably long. With this, it is difficult to make the solenoid valve compact, and it has not been possible to meet the demand for a further downsized solenoid valve. On the other hand, in the above-mentioned conventional pilot kick type solenoid valve 51, since the main valve body holding member 58 and the movable iron core 59 are fitted and inserted, the hollow portion formed from the main body 56 to the solenoid 57 is long, It is impossible to share parts with direct-acting valves, resulting in high manufacturing cost.

Therefore, an object of the present invention is to provide a compact pilot kick type solenoid valve in which the movable iron core is shortened to solve the above problems. Another object of the present invention is to reduce the manufacturing cost by sharing the parts with the direct acting solenoid valve.

[0006]

SUMMARY OF THE INVENTION A pilot kick type solenoid valve according to the present invention includes a main body having a main valve seat which is provided with a solenoid and which communicates between an outflow port and an inflow port, and the main valve. A main valve body holding member having a main valve body that abuts against a seat, and a pilot hole that communicates the pilot valve chamber with the outflow port, and a pilot valve body that opens and closes the pilot hole, and the pilot valve body is provided. A movable iron core that is pin-connected to the main valve body holding member with a play that allows the main valve body holding member, and a fixed iron core that is engaged with the movable iron core via a spring. A valve closing force due to the fluid pressure inside the pilot valve chamber and a valve opening force due to the fluid pressure inside the valve chamber act on the member, and the fluid inside the pilot valve chamber flows out from the opened pilot valve hole by the driving of the movable iron core. The above When the main valve body holding member is driven by the fluid pressure in the valve chamber with the depressurization of the ilot valve chamber, the main valve body is separated from the main valve seat, and when the solenoid is energized, the The main valve body holding member is made of a magnetic material so that the magnetic field generated in the solenoid excites the movable iron core and the main valve body holding member pin-coupled to the movable iron core. Further, in the pilot kick type solenoid valve of the present invention, the main valve body holding member is
It is preferably composed of martensitic stainless steel (SUS).

[0007]

In the pilot kick type solenoid valve of the present invention, the magnetic force generated by energizing the solenoid causes the movable iron core to be pulled by the fixed iron core and rise against the spring. It rises by the amount of play that is pin-coupled, and then the pilot valve element provided on the movable iron core separates, thereby opening the pilot hole formed in the main valve element holding member and opening the fluid in the pilot valve chamber. By flowing out from the pilot hole, the pressure in the pilot valve chamber is reduced, and due to the balance with the pressure in the valve chamber, the main valve body is separated from the main valve seat by the driving of the main valve body holding member even with a small magnetic force. By the way, when the solenoid is energized in this manner, the magnetic field generated in the solenoid excites not only the movable iron core but also the main valve body holding member made of a magnetic material, and the movable iron core is short. The small magnetic force effectively acts on the movable iron core and the main valve body holding member to satisfy the function of the solenoid valve. The pilot kick solenoid valve of the present invention has a short movable iron core because the main valve body holding member made of martensitic stainless steel (SUS) is excited together with the movable iron core by the magnetic field generated in the solenoid. Even if there is, a small magnetic force effectively acts on the movable iron core and the main valve body holding member to satisfy the function of the solenoid valve.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying a pilot kick type solenoid valve of the present invention will be described below with reference to the drawings. 1 and 2 are sectional views showing a pilot kick type solenoid valve of the present embodiment. FIG. 1 shows a valve closed and FIG. 2 shows a valve opened. The pilot kick solenoid valve of this embodiment has many common configurations with the above-described conventional pilot kick solenoid valve, but a more detailed description will be given here. The solenoid valve is composed of an upper half solenoid section 1 and a lower half valve section 2. At the center of the solenoid portion 1, a coil 4 in which a copper wire is wound around the body of a hollow cylindrical coil bobbin 3 having flanges at both ends is formed. A magnetic frame 5 is provided so as to surround the coil 4, and a lower iron core 6 of a circular plate having a hole at the center is provided at the lower end of the coil bobbin 3. An upper iron core 7 is inserted into and fixed to the upper end of the hollow portion of the solenoid portion 1 up to approximately the center of the coil 4.

The valve section 2 includes an inflow port 11 and an outflow port 1.
2 and the main body 13 is formed. The main body 13 has a hollow portion formed coaxially with the hollow portion of the solenoid portion 1 on the upper side, and a main valve seat on the lower side so as to project into the valve chamber 14 in the main body 13 from the outflow port 12 formed coaxially. 15 is formed. Such a solenoid portion 1 and a valve portion 2 are integrally configured so that both hollow portions are coaxially positioned, and a cylindrical pipe 21 made of a non-magnetic material is fitted and inserted in the hollow portion. The upper core 7 of the pipe 21 is partially inserted into the upper end of the pipe 21, while the lower end of the pipe 21 includes the valve chamber 1
It is fitted and inserted so as to be located at the 4th inlet, and is fixed at its upper and lower ends so as to maintain airtightness.

A first movable iron core 22 and a second movable iron core 23 are connected and fitted into the pipe 21 by a pin 24. In this embodiment, not only the first movable iron core 22 but also the second movable iron core 23 is made of a magnetic material. Specifically, it is a martensitic stainless steel material (SUS) that is easy to form. In the second movable iron core 23, a donut-shaped main valve body 25 that abuts the main valve seat 15 is fitted to the overhanging portion 23a at the lower end, while a recess is formed at the upper end to form the pilot valve chamber 26 (first One movable iron core 22 is included). A pilot hole 27 is formed in the second movable iron core 23 so as to penetrate the shaft core portion, and a valve seat 28 is provided at an upper end opening portion thereof.

On the other hand, the first movable iron core 22 which is pin-coupled
Has a mountain shape in conformity with the shape of the upper iron core 7 to which the upper end corresponds, and the spring 29 is fitted in the recess formed in the shaft core. The upper end of the first movable iron core 22 has a chevron shape
This is to reduce the downward pressure exerted on the first movable iron core 22 by the fluid pressure in the pilot valve chamber 26.
In addition, the lower end portion of the first movable iron core 22 is
Of the valve seat 28.
The pilot valve body 30 that abuts on is fitted. The through hole 31 into which the pin 24 is inserted is formed with a certain size larger than the diameter of the pin 24 so that the first movable iron core 22 can move up and down independently and provided with play.

Next, the operation of the pilot kick type solenoid valve of this embodiment having the above construction will be described. When not energized as shown in FIG.
Is pushed downward by the urging force of the pilot valve body 30 to abut the valve seat 28 to close the pilot hole 27, and the second movable iron core 23 is further pushed downward so that the main valve body 25 contacts the main valve seat 15. Contact. Therefore, the inflow port 11 and the outflow port 12 do not communicate with each other, the fluid flowing in from the inflow port 11 flows into the valve chamber 14, and further passes through the gap between the pipe 21 and the second movable iron core 23 into the pilot valve chamber 26. Pour in.

At this time, the pressure in the valve chamber 14 and the pilot valve chamber 26 is increased by the fluid flowing from the inflow port 11. Therefore, as shown in FIG. 1, when the main valve body 25 is in contact with the main valve seat 15 and the pilot valve body 30 is in contact with the valve seat 28, the fluid is overhanging part 23a of the second movable iron core 23.
Since the pressure applied to the upper surface of the second movable iron core 23 and the upper surface of the overhanging portion 23a in the pilot valve chamber 26 is larger than the pressure applied to the lower surface, such a valve closed state is maintained. on the other hand,
When a magnetic field is generated by energizing the coil 4, the first movable iron core 22 is pulled by the upper iron core 7 by the magnetic force, and the pin 24
Rises by the amount of play of the through-hole 31 that penetrates. At this time, even if the magnetic force generated in the coil 4 is weak, there is no problem because the magnetic force acts only on the first movable iron core 22 and the distance is small.

Since the pilot valve body 30 is separated from the valve seat 28 by the rise of the first movable iron core 22,
The fluid in the pilot valve chamber 26 flows out to the outflow port 12 through the pilot hole 27. Therefore, the pressure applied to the upper surface of the second movable iron core 23 by the fluid in the pilot valve chamber 26 is reduced. Therefore, the pressure of the fluid flowing into the valve chamber 14 relatively increases the pressure applied to the lower surface of the overhanging portion 23a, and a force that raises the second movable iron core 23 acts. Further, in the pilot kick type solenoid valve according to the present embodiment, since the second movable iron core 23 is also made of SUS material, the magnetic force due to the energization of the coil 4 is lower than the lower iron core 6 and the second iron core 6 as shown by the dotted line in FIG. The two movable iron cores 23, the first movable iron core 22, the upper iron core 7, and the magnetic frame 5 constitute a magnetic circuit. Therefore, even if the first movable iron core 22 is short, a high magnetic flux density can be obtained, and the first movable iron core 22
And a force sufficient to pull the second movable iron core 23 is exerted.

Therefore, the first movable iron core 22 and the second movable iron core 23 are integrally lifted and come into contact with the upper iron core 7. In this way, the valve hole of the main valve seat 15 is opened, and the fluid flows from the inflow port 11 to the outflow port 12. On the other hand, in order to close the valve hole of the main valve seat 15, when the coil 4 is de-energized, the urging force of the spring 29 opposes the fluid pressure and the first movable iron core 22 and the second movable iron core 23 are pushed down. The
The main valve body 25 contacts the main valve seat 15 and is closed.

As described above, according to this embodiment, the second movable iron core 2
Since 3 is made of a SUS material that is a magnetic material, the lower iron core 6, the second movable iron core 23, and the first movable iron core 2 are formed.
2. Since the magnetic circuit is configured via the upper iron core 7 and the magnetic frame 5, the magnetic efficiency of the generated magnetic field does not decrease even with the first movable iron core 22 having a short dimension, and a high magnetic flux density is obtained. be able to. Further, the size of the first movable iron core 22 is shortened, so that the solenoid valve main body can be made compact. Furthermore, since the overall dimensions when the first movable iron core 22 and the second movable iron core 23 are connected are short,
It is possible to share parts with a direct-acting solenoid valve that is not a pilot kick type, and it is possible to reduce manufacturing costs.

The pilot kick type solenoid valve of the present invention is not limited to the above-mentioned embodiment, and various modifications can be made without departing from the spirit of the invention. For example, although the martensitic SUS material is shown for the second movable iron core 23 of the embodiment, an austenitic SUS material or another magnetic material may be used.

[0018]

The pilot kick type solenoid valve of the present invention is
When the solenoid is energized, the main valve body is made of a magnetic material so that not only the movable iron core but also the main valve body pin-coupled to the movable iron core is excited by the magnetic field generated in the solenoid. It is possible to provide a compact pilot kick solenoid valve by shortening the movable iron core. Further, in the pilot kick type solenoid valve of the present invention, not only the movable iron core but also the main valve body pin-coupled to the movable iron core is made of a magnetic material, so that the dimension by the movable iron core and the main valve body is shortened,
By using common parts with the direct acting solenoid valve, it has become possible to reduce manufacturing costs.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pilot kick type solenoid valve according to the present invention when the valve is closed.

FIG. 2 is a sectional view showing an embodiment of a pilot kick solenoid valve according to the present invention when the valve is open.

FIG. 3 is a sectional view showing a conventional pilot kick type solenoid valve when the valve is closed.

[Explanation of symbols]

 1 solenoid part 2 valve part 4 coil 5 magnetic frame 6 lower iron core 7 upper iron core 13 main body 14 valve chamber 22 first movable iron core 23 second movable iron core 24 pin 25 main valve disc 26 pilot valve chamber 27 pilot hole 28 valve seat 29 Spring 30 Pilot valve body 31 Through hole

Claims (2)

(57) [Claims] 1. A pilot valve chamber comprising: a main body having a solenoid, which is provided with a main valve seat that communicates between an outflow port and an inflow port; and a main valve body that abuts on the main valve seat. The main valve body holding member is formed with a pilot hole that communicates with the outflow port, and the pilot valve body that opens and closes the pilot hole is provided with play enough to allow the pilot valve body to come into contact with and separate from the main valve. A movable iron core pin-coupled to the body holding member, and a fixed iron core that is provided via a spring with the movable iron core, and the main valve body holding member has a valve closing force due to fluid pressure in the pilot valve chamber. And the valve opening force due to the fluid pressure in the valve chamber acts, and the fluid in the pilot valve chamber flows out from the opened pilot valve hole due to the driving of the movable iron core. By fluid pressure In the pilot kick type solenoid valve in which the main valve body holding member is driven to separate the main valve body from the main valve seat, when the solenoid is energized, the magnetic field generated in the solenoid causes the magnetic field to be generated along with the movable iron core. A pilot kick type solenoid valve characterized in that the main valve body holding member is made of a magnetic material so that the main valve body holding member pin-connected to the movable iron core is also excited. 2. The pilot kick solenoid valve according to claim 1, wherein the main valve body holding member is made of martensitic stainless steel (SUS).