JP2003240148A - Solenoid valve mounted in tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the pressure leakage generated from a seal hardly made complete at a wiring part, by taking off the seal at the wiring part connected to a coil, in a solenoid valve mounted in a tank. <P>SOLUTION: In this solenoid valve for taking out the pressure in the tank 1 to the outside of the tank 1, a solenoid valve casing 4 is penetrated from an external part to an internal part of the tank 1, so that a coil 6 part is positioned inside the tank 1. The wiring part 28 from the coil 6 part to the outside of the tank 1 is mounted inside the casing 4, and the wiring connected to the coil is taken out to the outside of the tank 1 through the wiring part 29. The seal is applied so that the pressure in the tank 1 does not leak to the wiring part 29 from a clearance of components configurating the solenoid valve. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve mounted in a tank. For example, the solenoid valve is mounted in a tank containing a compressed gas and the compressed gas in the tank is taken out by an opening operation of the solenoid valve. Relates to a solenoid valve used to

[0002]

2. Description of the Related Art Conventionally, a pressurized tank (hereinafter referred to as a tank) filled with, for example, compressed natural gas used as a fuel for an automobile or hydrogen gas for a fuel cell for an automobile is mounted on an automobile, and the compressed natural gas in the tank is installed. A method of extracting a required amount of gas or the like by opening and closing a solenoid valve is known. This solenoid valve is mounted so as to project into the tank.As a wiring method for a harness that connects the coil for exciting the solenoid valve and the connector provided outside the tank, the harness is connected from the solenoid valve to the tank. A device in which a member for holding a solenoid valve is penetrated and then drawn out of the tank after being drawn out is disclosed in, for example, Japanese Patent Application Laid-Open No. 7-301359 and US Pat. No. 5,341,844.

[0003]

In the structure in which the harness is once pulled out from the solenoid valve into the tank and then pulled out from the tank as in the prior art, a seal member is provided in the gap between the harness and the member, and the seal member is provided. However, it is difficult to seal the elastic harness portion. Therefore, pressure leakage may occur particularly in a tank filled with high-pressure gas or the like.

In view of this, the present invention eliminates the above-described sealing member in the wiring portion in the case where the solenoid valve is mounted in the tank, and reliably prevents pressure leakage in the wiring portion even in a high pressure tank. It is intended to provide.

[0005]

In order to solve the above-mentioned problems, a first invention according to claim 1 is a solenoid valve for taking out the pressure in a tank to the outside of the tank, and at least a coil portion of the solenoid valve. Is installed so that it is located inside the tank, and the wiring for supplying power to its coil part is drawn out to the outside of the tank via the inside of the solenoid valve housing without being drawn into the tank. To do.

According to a second aspect of the present invention, there is provided a solenoid valve for extracting the pressure in the tank to the outside of the tank, wherein the solenoid valve housing is provided inside the tank so that the coil portion is located inside the tank. And a wiring portion from the coil portion to the outside of the tank is provided inside the housing, and the wiring connected to the coil is pulled out to the outside of the tank via the wiring portion. It is characterized in that a seal is provided so as not to leak into the wiring portion through the gap between the members constituting the.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described based on examples shown in the drawings.

1 and 2 show a first embodiment. FIG. 1 is a cross-sectional view of a main part of a tank 1 in which a solenoid valve 2 is attached to a fluid outlet, FIG. 2 is a schematic side view of the tank in which the solenoid valve of FIG. 1 is attached, and the solenoid valve 2 is It is projected from the outside of the tank 1 into the tank chamber 3, that is, the high-pressure side.

The solenoid valve 2 has a cylindrical casing 4, and the casing 4
The upper part of the housing 4 is screwed to the constituent wall 1a of the tank 1 with the screw 5, the lower part of the housing 4 projects into the tank chamber 3, and the upper end part projects to the outside of the tank 1.

A bobbin 7 around which an exciting coil 6 is wound is provided in a portion of the housing 4 located inside the tank, and a cylindrical guide 8 is provided on the inner circumference of the bobbin 7. The holding cylinder 9 is fitted around the bobbin 7.
The holding cylinder 9 is fitted in the housing 4. A plunger 10 is disposed in the guide 8 so as to be slidable in the axial direction, a pilot valve 11 is provided at one end of the plunger 10, and the other end opposes a fixed stator 12 so as to be contactable and separable. is doing. When the coil 6 is energized, the plunger 10 is attracted to the stator 12 side against the spring 13, the pilot valve 11 is opened apart from the pilot seat 14, and the coil 6 is de-energized so that the spring 13 is biased. By pilot valve 1
1 is pressed against the pilot seat 14 to close the valve.

A main valve 15 having the pilot seat 14 is axially slidably provided on the inner peripheral portion of the guide 8 and on the outer peripheral portion of the pilot valve 11, and the main valve 15 is provided. An annular main seat 16 is provided on the housing 4 side so as to face the main seat 16, and a main valve 15 is provided so as to be able to come into contact with and separate from the main seat 16. An outlet 17 is formed in the central portion of the main seat 16 in the housing 4, and the main valve 1
When 5 is pressed against the main seat 16, the outlet 17
Is closed, and the main valve 15 is separated from the main seat 16 by the spring 18, so that the outflow port 17 is opened.

When the coil 6 is energized, the plunger 10 moves downward in FIG. 1 so that the fluid in the tank chamber 3 flows from the inlet 19 formed in the housing 4 to the gap between the main valve 15 and the guide 8. 20 and the gap 21 between the main valve 15 and the pilot valve 11, flow into the pilot seat 14 and flow out from the hole 22 to the outlet 17.
Further, when the pressure difference between the inlet port 19 side and the pilot seat 14 side becomes small and the main valve 15 is separated from the main seat 16 by the urging force of the spring 18, the fluid in the tank chamber 3 is discharged from the inlet port 19. It flows out from the outflow port 17 through the gap between the main valve 15 and the main seat 16. The outer end of the outlet 17 communicates with the outlet 17a outside the tank shown in FIG.

The stator 12 and the end of the guide 8 on the side of the stator 12 are welded by welding W and are sealed over the entire circumference.

Further, the side of the guide 8 opposite to the stator 12 is screwed to the housing 4 with a screw 23, and the first seal member 24 is provided between the outer peripheral portion of the guide 8 and the housing 4. Is interposed, the entire circumference between the guide 8 and the housing 4 is sealed.

A cap 25 is fixedly secured to the tip of the housing 4 on the side projecting into the tank chamber 3 by an appropriate fixing means, and the cap 25 closes the tip of the housing 4. A small-diameter fitting portion 25a that fits on the inner peripheral surface of the housing 4 is integrally formed on the cap 25, and between the outer peripheral surface of the fitting portion 25a and the inner peripheral surface of the housing 4. A second seal member 26 is interposed, and the second seal member 26 seals the entire space between the cap 25 and the housing 4. 27 is a resin ring.

A third seal member 28 is interposed between the opposed surfaces of the holding cylinder 9 and the cap 25, and is provided as a backup for the second seal member 26.

As each of the seal members 24, 26, 28, an O-ring made of rubber or resin, a C-ring having a C-shaped cross section, a seal ring filled with an inert gas, or the like can be used. It may be sealed by welding instead of a ring or the like.

A wiring insertion hole 29, which is a wiring portion for connecting to an external electric wire, is formed in the body of the housing 4 so as to be embedded along the axial direction of the housing 4, and an inner opening portion at one end thereof is formed. 29b is open to the bobbin 7 part, and the other end is open to the atmosphere side of the housing 4 protruding to the outside (atmosphere side) of the tank 1, and the wiring insertion hole 29 does not open into the tank chamber 3. Is formed. In FIG. 2, reference numeral 29a indicates a wiring derivation unit.

A wiring (harness) 30 is connected to the coil 6, and the wiring 30 passes from the inner opening 29b of the wiring insertion hole 29 through the wiring insertion hole 29 to the wiring insertion hole 2
The wiring lead-out portion 29a that is open to the atmosphere side of 9 is drawn out of the tank and is connected to the connector 31 at its tip. The connector 31 is connected to an external electric wire. In addition, a seal member for sealing between the wiring 30 and the housing 4 is not provided inside the wiring insertion hole 29.

In the above structure, the high pressure fluid in the tank chamber 3 that has entered the screw 23 through the inlet 19 is the first
Sealing is performed by the sealing member 24, and leakage from the joint portion 32 between the housing 4 and the guide 8 to the wiring insertion hole 29 that is a connection portion with an external electric wire is prevented.

The high-pressure fluid that has entered the guide 8 through the inflow port 19 has a gap 2 between the main valve 15 and the guide 8.
Although it penetrates into the gap 33 between the plunger 10 and the guide 8 through 0, the welding W between the guide 8 and the stator 12 prevents the leak to the outside of the guide 8 and prevents the leak to the wiring insertion hole 29.

The joint 3 between the housing 4 and the cap 25
The high-pressure fluid that has entered into 4 is sealed by the second sealing member 26, and the high-pressure fluid is passed through the joints of the holding cylinder 9 and the housing 4, the holding cylinder 9 and the bobbin 7, and the bobbin 7 and the guide 8 through the wiring insertion hole 29. To prevent it from leaking out.

As described above, it is possible to prevent the high-pressure fluid in the tank chamber 3 from leaking into the wiring insertion hole 29, which is a wiring portion, because the wiring insertion hole 29 has a portion between the wiring 30 and the housing 4. Since it is not necessary to provide a sealing member for sealing the wiring, it is possible to solve the conventional difficulty of sealing the wiring portion. That is, the pressure leakage can be prevented by the relatively easy seal between the parts made of the hard material.

FIG. 3 shows a second embodiment. The second embodiment shows another example of the connecting portion with the external electric wire in the first embodiment.

That is, the housing 4 in the first embodiment.
Inside, one end opens to the bobbin 7 and the other end opens to the tank 1.
A hole 29c that is open to the atmosphere side of the housing 4 and that protrudes to the outside (atmosphere side) of the female terminal 3 is formed in the hole 29c.
0a at the inner end is inserted through the wiring 30 and the wiring 3
0 and the hole 29c except the female terminal 30a are filled with a resin material and solidified to form a resin layer 29d.
And the wiring 30 and the female terminal 30a are formed on the housing 4
It is integrated with. The male terminal 30b connected to the coil 6 is press-fitted and connected to the female terminal 30a. The hole 29c and the resin layer 29d form a wiring portion with an external electric wire.

Since the other structure is the same as that of the first embodiment, the same parts as those described above are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, the same action and effect as those in the first embodiment are exhibited, but the airtightness is also improved in the wiring 30 portion by the resin material 29b.

FIG. 4 shows a third embodiment. In the third embodiment, the wiring 30 and the female terminal 30a shown in FIG. 3 are integrally molded when the resin casing 4 is molded. In this embodiment, the portion where the wiring 30 is inserted serves as a wiring portion for connecting to an external electric wire.

Since the other structure is the same as that of the first embodiment, the same parts as those described above are designated by the same reference numerals and the description thereof will be omitted. Also in the third embodiment, the same action and effect as in the second embodiment are exhibited.

The solenoid valve of the present invention can be applied to a low pressure tank, but of course, a high pressure such as a hydrogen tank for a fuel cell mounted on an automobile, for example, 35 to 70 MP.
It is particularly effective when applied to a high-pressure tank on which the pressure of a acts.

[0031]

As described above, according to the present invention, the wiring connected to the coil portion of the solenoid valve is drawn out of the tank via the inside of the solenoid valve housing without being drawn from the solenoid valve into the tank. By sealing the pressure in the tank so as not to leak from the gap between the components forming the solenoid valve to the wiring portion, it is possible to eliminate the need for sealing at the wiring portion.

Therefore, particularly in a tank filled with a high-pressure fluid, it is possible to eliminate the seal at the wiring portion, which is difficult to seal, and prevent the pressure in the tank from leaking out of the tank.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a solenoid valve of the present invention.

FIG. 2 is a schematic side sectional view showing how the solenoid valve shown in FIG. 1 is attached to a tank.

FIG. 3 is a longitudinal sectional view of a main part showing a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a main part showing a third embodiment of the present invention.

[Explanation of symbols]

1 tank 2 Solenoid valve 3 tank room 4 housing 6 coils 29 Wiring insertion hole which is a wiring part 29c, 29d Holes and resin layers that form the wiring part 30 wiring 24, 26, 28 Seal part Sealed part by W welding

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01F 7/126 H01F 7/16 K 7/16 B60K 15/08 (72) Inventor Kiyoshi Yoshizumi Toyota City, Aichi Prefecture Toyota Town No. 1 F-term in Toyota Motor Corporation (Reference) 3D038 CA27 3E072 AA03 DB03 GA30 3H106 DA07 DA13 DA23 DB02 DB12 DB23 DB32 DC02 DC17 DD03 EE34 EE41 GA06 GB01 GC27 GD01 GD06 KK13 KK17 5E048 AA09 AB01 AD02

Claims (2)

[Claims] 1. A solenoid valve for extracting the pressure in a tank to the outside of the tank, wherein at least a coil portion of the solenoid valve is attached so as to be located inside the tank, and wiring for supplying power to the coil portion. Is a solenoid valve mounted in a tank, which is drawn out of the tank through the inside of the solenoid valve housing without being drawn into the tank. 2. A solenoid valve for extracting the pressure in the tank to the outside of the tank, the solenoid valve housing being provided so as to penetrate from the outside to the inside of the tank so that the coil portion is located inside the tank. A wiring portion from the coil portion to the outside of the tank is provided inside, and the wiring connected to the coil is pulled out to the outside of the tank via the wiring portion, and the pressure in the tank causes the wiring from the gap between the members constituting the solenoid valve. A solenoid valve mounted in a tank that is sealed so that it does not leak to the inside.