JPH11257523A - High pressure solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high pressure solenoid valve in which the movement of a valve element is smooth together with a valve element housing and which has good responsiveness without easily slipping off the valve element from the valve element housing even though a valve element formed of a resinous material is used. SOLUTION: In this high pressure solenoid valve equipped with a solenoid operated directional control valve part A and a main valve part B and in which high pressure fluid is supplied from an IN side out of channels 19, a valve element 20 is fitted into the recessed part 23 of a valve element housing 22. High pressure fluid on the IN side is led to flow into from a pilot port 17 so as to increase the pressure of a pilot pressure part 25. While, the hole 24 of the valve element housing 22 and the passing hole 26 of the valve element 20 have low pressure. A packing 28 is arranged in a position between the valve element 20 and the recessed part 23 of the valve element housing 22 and also outside an abutting surface of the valve element 20 on a valve seat 21, thereby a high pressure part and a low pressure part can be partitioned off. A passing hole 26 and a dent 27 are arranged in the valve element 20, and the side of the valve element 20, which is opposite to the abutting surface on the valve seat 21 is identified as the low pressure part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure solenoid valve for flowing a high-pressure fluid, and more particularly, to a structure of a valve body and a valve housing used for the high-pressure solenoid valve.

[0002]

2. Description of the Related Art A high-pressure solenoid valve for flowing a high-pressure fluid having a fluid pressure of 10 MPa or more particularly requires a sealing property between a valve body and a valve seat. In particular, the sealing material of the valve body and the valve seat needs to be formed of a material having strength to withstand pressure.

Conventionally, therefore, both the valve element and the valve seat are generally made of metal. However, in order to seal between metals, it is necessary to improve the dimensional accuracy of both metals extremely. Because metal is less flexible,
This is because even if the valve body is pressed against the valve seat, it hardly deforms, and if the dimensional accuracy is poor, reliable sealing cannot be performed. But,
Improving the dimensional accuracy requires a high level of processing technology and is costly.

On the other hand, it is not appropriate to use soft rubber for the valve body or valve seat. This is because although it is flexible and has good sealing properties, it has low strength and may be deformed or broken by the pressure of the fluid. Therefore, a resin material may be used as an intermediate material between metal and rubber. A resin material has appropriate flexibility, so that the requirement for dimensional accuracy may be rougher than when a metal is used. In addition, it has an appropriate strength, and there is no possibility of being easily damaged by the pressure of the fluid.

Here, a configuration of a conventional high-pressure solenoid valve using a resin valve body will be described with reference to the drawings. FIG.
Is a sectional view showing a schematic configuration of a conventional high-pressure solenoid valve,
FIG. 12 is an enlarged view of a peripheral portion of a conventional high-pressure solenoid valve, and FIG. 13 is a schematic diagram for explaining the operation of the conventional high-pressure solenoid valve. As shown in FIG.
Is a pilot-type solenoid valve, which includes a solenoid-operated, direct-acting switching valve portion A and a main valve portion B, which are pilot valves.
Further, pressure from the high pressure fluid is applied from the IN side.

The switching valve section A includes an electromagnet 101, a plunger 102, a spring 103, a piston 104, and a spring 105. When the electromagnet 101 is excited, the plunger 102 is moved upward in the figure, and when the electromagnet 101 is demagnetized, the plunger 102 is moved downward in the figure by the restoring force of the spring 103. Further, the piston 104 is separated or pressed against the valve seat 106 by the movement of the plunger 102 and the restoring force of the spring 105.

The main valve portion B has a valve element 110, a valve seat 111, a valve element housing 112, and a pilot port 113. The valve element 110 is fitted and held in a recess 112 a formed in the valve element housing 112, and the valve element housing 11
2 moves up and down in the figure, the valve element 110 and the valve seat 111 are separated or pressed against each other, and the high-pressure fluid is circulated or cut off.

Here, since the valve body 110 is formed of a resin material, the dimensional accuracy does not need to be so severe. However, the resin material has a large coefficient of thermal expansion, expands by heat during use, and contracts by cooling after use. Therefore, it is necessary to provide an appropriate gap between the inner wall of the concave portion 112a of the valve body housing 112 and the valve body 110 so as to absorb a change in size during thermal expansion. If there is no allowance for the size of the concave portion 112a, the valve seat
In some cases, deformation may occur to the side, and the sealing performance between the valve body 110 and the valve seat 111 may be deteriorated, or the valve body 110 may be permanently deformed. Further, when the internal stress increases, the valve element 110 may be damaged. Therefore, as shown in FIG. 12, a minute gap 115 is provided between the concave portion 112a and the valve element 110. Further, the valve element 110 is fixed by caulking the valve element housing 112 so as not to fall out of the valve element housing 112.

FIG. 11 shows the switching valve portion A and the main valve portion B both in a valve closed state. The high-pressure fluid flowing from the pilot port 113 is supplied to the valve housing 112 and the piston 1.
The pressure stays in the pilot pressure portion 107 during the period 04, and the inside of the pilot pressure portion 107 is in a high pressure state. Pilot pressure section 107
The high pressure presses the valve housing 112 downward in the figure. On the other hand, since the high pressure due to the high-pressure fluid is applied to the valve body housing 112 upward from the lower side in the figure, the pressure applied to the valve body housing 112 is balanced. Therefore, the valve body housing 112 is pressed downward in the figure by the plunger 102, and the valve body 110 is
11, the main valve portion B is closed.

Here, when the switching valve section A is operated to move the plunger 102 and the piston 104 upward in the figure to open the valve seat 106, the pilot pressure section 1
07 flows from the valve seat 106 to the valve housing 1.
The pressure is discharged to the twelve holes 114, and the pressure in the pilot pressure unit 107 is reduced. Therefore, the balance of the pressure applied to the valve body housing 112 is lost, and the valve body housing 112 is pressed upward in the figure by pressure from below in the figure due to the high-pressure fluid. Since the plunger 102 is also separated from the valve body housing 112, the valve body housing 112 moves upward in the drawing, so that the valve body 110 is separated from the valve seat 111,
The main valve portion B is opened.

Here, the valve body 110 and the valve body housing 1
The relationship between the pressures applied to 12 will be described with reference to FIG.
Here, the pilot port 113 and the pilot pressure section 107 are omitted, and are collectively expressed as a space X.
The space X is a high pressure part, and the space Y is a low pressure part. Here, the pressure from the left and right directions is irrelevant, so that the description is omitted.

The pressure from above in the figure is only the high pressure due to the space X and is applied to the width LX of the upper end surface of the valve housing 112. On the other hand, the pressure from the lower side in the figure includes a space Y and a low-pressure portion due to the sealing portion between the valve body 110 and the valve seat 111, and a high-pressure portion due to the space X. As shown in FIG. 13, the high-pressure portion is a length (LX-LY) obtained by removing the width LY of the low-pressure portion from the width LX. As is apparent from FIG.
Since X> (LX-LY), the valve body housing 112
Is greater from above in the figure, so the valve element 110 is pressed against the valve seat 111. This allows
The valve can be closed reliably.

[0013]

However, FIG.
As shown in the figure, when a gap 115 is provided between the concave portion 112a of the valve body housing 112 and the valve body 110, a high pressure enters the gap 115 when the valve is closed, that is, when the high-pressure solenoid valve is not used. There is a risk. This is because even if the expansion of the valve element 110 proceeds in the direction of the gap 115 during thermal expansion, the gap 1
It is impossible to shrink only in the direction from 15. That is, a gap is easily formed between the valve body 110 and the concave portion 112a. Even with a small gap, the high pressure of the fluid can penetrate. In particular, this is likely to occur when the high-pressure fluid is a gas.

Here, when the high-pressure fluid enters the space S between the valve body 110 and the recess 112a, the high pressure is applied to the valve body 11
0 is separated from the valve body housing 112 and acts on the valve body 110 as a force for pressing downward in the figure. That is, the valve element 110 is easily removed from the recess 112a. Alternatively, when the valve body housing 112 is moved upward in the drawing to open the valve, the valve body 110 may be opened.
May act as a large resistance. In this case, the response from opening of the switching valve portion A to opening of the main valve portion B may be deteriorated.

[0015] The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent a valve element from easily coming out of a concave portion of a valve element housing even if a resin valve element is used. It is an object of the present invention to provide a high-pressure solenoid valve in which the movement of the valve body is smooth with the body housing and the response is good.

[0016]

According to a first aspect of the present invention, a flow path for a high pressure fluid is divided into a high pressure side and a low pressure side with a valve seat as a boundary. On the side, a valve element that is in contact with the valve seat is fitted and held in a recess provided on the distal end side of the valve element housing, and in a state where the valve element is in contact with the valve seat, A fluid pressure on the low pressure side is applied to the pressure receiving surface on the distal end side of the valve element, and a gap between the inner wall of the concave portion and the valve element communicates from the high pressure side to the low pressure side. An electromagnetic switching valve section for switching and supplying the high-pressure side fluid pressure or the low-pressure side fluid pressure to a surface, and by switching the switching valve section, The pressure received by the proximal pressure receiving surface and the distal pressure receiving surface of the valve body housing In a high-pressure electromagnetic valve configured to move the valve body housing to abut or separate from the valve seat by changing a balance with a pressure received by a distal-side pressure receiving surface of the valve body, Seal means for partitioning the high-pressure side and the low-pressure side from each other in the gap between the inner wall of the valve body and the valve body, wherein the seal means is provided on an outer side with respect to a contact surface between the valve body and the valve seat. At the position, it is arranged on the outer periphery of the valve body.

According to the above arrangement, the pressure on the high pressure side applied to the gap between the inner wall of the recess and the valve body is cut off by the sealing means, and the pressure acts on the surface of the valve body opposite to the pressure receiving surface on the tip end side. Never do.

In order to achieve the above object, according to a second aspect of the present invention, in the configuration of the first aspect, the valve element is provided with the fluid on the low pressure side at a position opposite to the pressure receiving surface on the distal end side. It has a dent for introducing pressure, and the dent includes a base-side pressure-receiving surface having the same area as the distal-side pressure-receiving surface of the valve element.

According to the above configuration, in addition to the operation of the first aspect of the present invention, the low pressure side fluid pressure acts on the pressure receiving surface on the distal end side of the valve body and the depression on the opposite side. This ensures that low pressure acts on the opposite side of the valve body from the pressure receiving surface on the distal end side. And since the base end side pressure receiving surface of a dent has the same area as the front end side pressure receiving surface, the pressure applied to those pressure receiving surfaces will cancel each other.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the "high pressure solenoid valve" of the present invention will be described in detail with reference to the drawings. The configuration of the high-pressure solenoid valve according to the first embodiment will be described with reference to FIGS. 1, 2, and 3. FIG. FIG. 1 is a sectional view showing a schematic configuration of a high-pressure solenoid valve 1 according to the present embodiment, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a schematic diagram for explanation.

As shown in FIG. 1, the basic structure of the high-pressure solenoid valve 1 is the same as that of the conventional high-pressure solenoid valve 100. That is, the high-pressure solenoid valve 1 is a pilot-type solenoid valve, and includes an electromagnetic, direct-acting switching valve portion A and a main valve portion B. Further, the main valve portion B has a flow path 19, of which IN
The side is the high pressure side because the pressure by the high pressure fluid is applied, and the OUT side is the low pressure side.

The switching valve section A includes an electromagnet 11, a plunger 1
2, a spring 13, a piston 14, a spring 15, and a valve seat 16 are provided. These may be general ones and are the same as those conventionally used. In the switching valve section A, the electromagnet 11
And the restoring force of the spring 13,
The plunger 12 is attracted to or separated from the electromagnet 11. Further, the piston 14 is separated or pressed against the valve seat 16 by the movement of the plunger 12 and the restoring force of the spring 15.

The main valve section B includes a valve body 20, a valve seat 21, a valve body housing 22, and a pilot port 17, as shown in FIGS. The valve body 20 is made of resin and is substantially ring-shaped with a through hole 26 at the center.
And is held by being fitted into the concave portion 23. The through hole 26 of the valve body 20 communicates with the hole 24 of the valve body housing 22, and a recess 27 is provided on the upper surface of the valve body 20 in the drawing, so that a gap is formed between the valve body 20 and the valve body 20. You. further,
A packing 28 as a sealing means is provided between the valve body 20 and the concave portion 23 at a position outside the contact surface between the valve body 20 and the valve seat 21, and a stopper plate for preventing the packing 28 from coming off 29 are provided. The packing 28 is fitted between the step 23 a of the recess 23 and the valve body 20. Further, the stopper plate 29 is provided with the step 20 a provided on the valve body 20 and the recess 23.
The valve body housing 2
2 is fixed by caulking.

Here, in FIG.
5 corresponds to the base-side pressure-receiving surface of the valve housing of the present invention, and in FIGS. 1 and 2, the lower end of the valve housing 22 facing the flow path 19 is
This corresponds to the pressure receiving surface on the distal end side of the valve body housing of the present invention. 1 and 2, the valve body 20 facing the hole of the valve seat 21 is shown.
Corresponds to the distal-side pressure-receiving surface of the valve element of the present invention, and the bottom surface of the depression 27 of the valve element 20 corresponds to the base-side pressure-receiving surface of the same area as the distal-side pressure-receiving surface of the present invention.

In the valve closed state, the pressure of the high-pressure fluid on the IN side exerts a force on the valve housing 22 to separate the valve 20 and the valve housing 22 from the valve seat 21. On the other hand, since the pressure of the high-pressure fluid flowing from the pilot port 17 is also applied to the pilot pressure portion 25 between the valve housing 22 and the piston 14, the valve housing 22 has the valve housing 22 and the valve housing 20. Is pressed against the valve seat 21.

Here, in the valve closed state, the valve body 20,
The relationship between the pressure applied to the valve housing 22 will be described with reference to FIG. In the figure, a space X is a high-pressure section (high-pressure side), and a space Y is a low-pressure section (low-pressure side). Since the valve body 20 is made of resin, it expands and contracts due to heat during use, and a gap may be formed between the valve body 20 and the valve body housing 22. However, the high pressure part and the low pressure part are sealed by the packing 28, so that the high pressure that has entered from the space X can reach only the gap S1. On the other hand, the through hole 26 provided in the valve body 20
And the low pressure that has entered through the depression 27 reaches the gap S2. Here, the contact surface between the valve body 20 and the valve seat 21, that is, the valve seat seal diameter is Q, and the inside diameter sealed by the packing 28 or the outside diameter of the valve body 20 is P. Here, as shown in FIG. 3, P> Q.

In FIG. 3, the vertical pressure applied to the valve body 20 is such that a low pressure is applied to the depression 27 and the gap S2 from above, a low pressure is applied to the space Y, and a high pressure is applied to the space S1 from below. Here, the low-pressure side fluid pressure acts on each of the distal-side pressure-receiving surface of the valve element 20 and the proximal-side pressure-receiving surface of the depression 27 in a direction opposite to each other. In addition, since the base-side pressure-receiving surface of the depression 27 has the same area as the distal-side pressure-receiving surface, the pressures applied to those pressure-receiving surfaces cancel each other. Therefore, the high pressure applied to the valve body 20 is not the same as that in FIG.
This is only for the middle (PQ), and this pressure is applied upward in the figure. Further, the pressure applied to the valve housing 22 is only a high pressure due to the space X, and pressure is applied to both (R) portions in FIG. That is, the pressure applied to the valve housing 22 is directed downward in the figure with respect to the part (P) in FIG.

Therefore, in the valve closed state, the valve body 20
And the valve housing 22 as a whole, pressure is applied to the part (P) from above in the figure and to the part (PQ) from below in the figure, and P> (PQ). The valve body 20 and the valve body housing 22 are pressed against the valve seat 21. In addition, pressure is applied only to the portion (P-Q) from below in the figure, and the valve body 20 is pressed against the valve body housing 22.

On the other hand, when the high pressure solenoid valve 1 is opened, the operation of the switching valve portion A causes the piston 14 to move, and the valve seat 1 to move.
6 is opened, the high-pressure fluid flowing from the pilot port 17 into the pilot pressure portion 25 is
And the pilot pressure section 25 is depressurized. Therefore, in FIG. 3, the pressure applied to the valve housing 22 from the upper side in the figure becomes lower, and the pressure applied to the part (R) from the upper and lower sides in the figure becomes equal. On the other hand, the pressure applied to the valve body 20 does not change, and only the pressure for the portion (PQ) from below in the figure. Therefore, the pressure of the valve body housing 22 and the valve body 20 as a whole increases from below in the figure, and the valve body 20
Is separated from the valve seat 21. Further, the pressure from below in the figure is greater than the pressure from above in the figure, so that the valve 20 follows the valve housing 22 and moves smoothly.

As described above, according to the high-pressure solenoid valve 1 of the present embodiment, since the valve body 20 is formed of a resin material,
Due to the moderate flexibility, the dimensional accuracy does not need to be so severe. Also, the valve body 20, the valve body housing 2
Since the relationship of the dimensions of 2 is P> Q, in the valve closed state, upward pressure is applied to the valve element 20 and downward pressure is applied to the valve element housing 22, and the downward pressure is greater. And the valve body housing 22 is pressed against the valve seat 21,
The sealing property between the valve body 20 and the valve seat 21 can be ensured. In particular, in this embodiment, the low pressure side pressure applied to the distal pressure receiving surface of the valve element 20 upward is offset by the low pressure side pressure applied to the proximal pressure receiving surface of the depression 27 downward. Therefore, when the valve is closed, the upward force applied to the valve body 20 can be reduced by the pressure on the low pressure side applied to the pressure on the distal end side, and the sealing performance between the valve body 20 and the valve seat 21 can be reduced accordingly. Can be improved.

On the other hand, when the valve is opened, the upward pressure applied to the valve body 20 is larger than that downward, so that the valve body 20 can favorably follow the upward movement of the valve housing 22. . In particular, in this embodiment,
The high-pressure side pressure applied to the gap between the inner wall of the concave portion 23 and the valve body 20 is blocked by the packing 28, and the pressure acts on the upper end surface of the valve body 20, that is, the surface on the opposite side to the front-side pressure receiving surface. Therefore, the downward force applied to the valve body 20 is greatly reduced. As a result, it is possible to prevent the valve element 20 from easily coming out of the concave portion 23 of the valve element housing 22, and to make the movement of the valve element 20 together with the valve element housing 22 smooth and responsive.

[Second and Third Embodiments] Next, second and third embodiments of the "high pressure solenoid valve" of the present invention will be described in detail with reference to the drawings. The configuration of the high-pressure solenoid valve according to the second and third embodiments will be described with reference to FIGS. FIG. 4 is a partial cross-sectional view illustrating a main part of a high-pressure electromagnetic valve 2 according to a second embodiment, and FIG. 5 is a partial cross-sectional view illustrating a main part of a high-pressure electromagnetic valve 3 according to a third embodiment. In the second to eighth embodiments described below, the basic structure is the same as that of the first embodiment.
The same members are denoted by the same reference numerals, and only different portions will be described.

The high-pressure solenoid valve 2 and the high-pressure solenoid valve 3 according to the second and third embodiments are, as shown in FIGS. 4 and 5, a high-pressure solenoid valve 1 according to the first embodiment and a packing. 28 is different. The high-pressure solenoid valve 2 has a step 20
a is formed, and a packing 28 is fitted between the step 20 a and the recess 23. In the high-pressure solenoid valve 3, the packing 28 is fitted into a groove 23 c provided on the inner periphery of the concave portion 23 of the valve housing 22. In any case, the stopper plate 29 is further fitted, and the valve body housing 22 is caulked and fixed. Therefore, the same operations and effects as those of the first embodiment can be obtained in these embodiments.

[Fourth Embodiment] Next, a fourth embodiment of the "high pressure solenoid valve" of the present invention will be described in detail with reference to the drawings. The configuration of the high-pressure solenoid valve according to the fourth embodiment will be described with reference to FIG. FIG. 6 is a partial sectional view showing a main part of the high-pressure solenoid valve 4 according to the fourth embodiment.

The high-pressure solenoid valve 4 according to the fourth embodiment comprises:
This is a modification of the third embodiment. As shown in FIG. 6, a high-pressure solenoid valve 1 according to the first embodiment and a valve body 2
0, the shape of the valve housing 22 is different, and the stop plate 29 is omitted. Instead, the protrusion 30 provided on the valve body housing 22 and the protrusion 31 provided on the valve body 20 are engaged with each other to make it difficult for the valve body 20 to fall out of the recess 23.

Therefore, in this embodiment, the following effects can be obtained in addition to the same operations and effects as those of the first embodiment. That is, since the stopper plate 29 is not used, the number of parts can be reduced. In addition, the valve body 2 is simply pushed into the recess 23 of the valve body housing
0 can be attached and prevented, and there is no need to caulk the valve housing 22, so that assembly can be easily performed in a short time.

[Fifth and Sixth Embodiments] Next, fifth and sixth embodiments of the "high pressure solenoid valve" of the present invention will be described in detail with reference to the drawings. The configuration of the high-pressure solenoid valve according to the fifth and sixth embodiments will be described with reference to FIGS. FIG. 7 is a partial cross-sectional view illustrating a main part of a high-pressure electromagnetic valve 5 according to a fifth embodiment, and FIG. 8 is a partial cross-sectional view illustrating a main part of a high-pressure electromagnetic valve 6 according to a sixth embodiment.

The high-pressure solenoid valve 5 and the high-pressure solenoid valve 6 according to the fifth and sixth embodiments are different from the high-pressure solenoid valve 1 according to the first embodiment as shown in FIGS. The valve seal diameter is increased. Therefore, the ring-shaped valve element 2
0 is an annular recess 2 provided in the valve housing 22.
3 and is stopped by the stopper plate 29. Also in this case, the packing 28 is located at a position larger than the diameter of the valve seat seal.
Are provided as sealing means. In the high-pressure solenoid valve 5, the packing 28 is fitted into a groove 23 c provided on the inner periphery of the concave portion 23 of the valve housing 22. In the high-pressure solenoid valve 6, the packing 28 is provided with a groove 20 provided on the outer periphery of the valve body 20.
c. In any case, a pressure release hole 32 is further provided on the valve body 20 on the side opposite to the valve seat 21 side, and communicates with the hole 24 of the valve body housing 22. This lowers the pressure at the upper end of the valve body 20.

In these cases, the pressure relationship is the same as in the first embodiment. Therefore, also in these embodiments, the same operations and effects as those of the first embodiment can be obtained.

[Seventh and Eighth Embodiments] Next, seventh and eighth embodiments of the "high pressure solenoid valve" of the present invention will be described in detail with reference to the drawings. The configuration of the high-pressure solenoid valve according to the seventh and eighth embodiments will be described with reference to FIGS. FIG. 9 is a partial cross-sectional view showing a main part of a high-pressure electromagnetic valve 7 according to a seventh embodiment, and FIG. 10 is a partial cross-sectional view showing a main part of a high-pressure electromagnetic valve 8 according to an eighth embodiment.

The high-pressure solenoid valve 7 and the high-pressure solenoid valve 8 according to the seventh and eighth embodiments are modifications of the fifth and sixth embodiments. As shown in FIGS. The valve seat seal shape is conical as compared with the high-pressure solenoid valve 5 according to the fifth embodiment. Therefore, the contact surfaces between the valve element 20 and the valve seat 21 are tapered. Also in this case, the packing 28 is provided at a position larger in diameter than the valve seat seal diameter, and is used as sealing means. Further, the valve seat 21 of the valve body 20
The pressure release hole 32 is provided on the opposite side to the valve body housing 2.
2 through the hole 24. This lowers the pressure at the upper end of the valve body 20. Therefore, also in this embodiment,
Functions and effects similar to those of the fifth and sixth embodiments can be obtained.

It should be noted that the present invention is not limited to the above embodiments, and it is needless to say that improvements and modifications can be made without departing from the spirit of the invention.

[0043]

According to the first aspect of the present invention, the sealing means for dividing the high pressure side and the low pressure side is provided in the gap between the inner wall of the concave portion of the valve body housing and the valve body fitted in the concave portion. The sealing means is arranged on the outer periphery of the valve body outside the contact surface between the valve body and the valve seat. Therefore, the pressure on the high pressure side applied to the gap between the inner wall of the concave portion and the valve body is cut off by the sealing means, and the pressure does not act on the surface of the valve body opposite to the pressure receiving surface on the tip end side. For this reason, even if a resin valve element is used, it is possible to prevent the valve element from easily coming out of the concave portion of the valve element housing, and the movement of the valve element together with the valve element housing is smooth and responsive. The effect that can be made.

According to a second aspect of the present invention, in the first aspect of the present invention, a recess for introducing a low-pressure fluid pressure is provided at a position opposite to the distal-side pressure-receiving surface of the valve body, and the distal-side pressure-receiving portion is provided in the recess. A base-side pressure receiving surface having the same area as the surface is provided. Therefore, in addition to the operation and effect of the first aspect of the invention, the pressure applied to the pressure receiving surface on the distal end side of the valve body and the pressure applied to the pressure receiving surface on the base end side of the recess on the opposite side cancel each other. Therefore, when the valve is closed, the force applied to the valve body in the direction opposite to the closing direction can be reduced, and the effect of improving the sealing performance between the valve body and the valve seat can be achieved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a schematic structure of a high-pressure solenoid valve according to a first embodiment.

FIG. 2 is a sectional view showing a main part of the high-pressure solenoid valve.

FIG. 3 is a schematic diagram for explaining a pressure relationship applied to a high-pressure solenoid valve.

FIG. 4 is a cross-sectional view showing a main part of a high-pressure solenoid valve according to a second embodiment.

FIG. 5 is a cross-sectional view showing a main part of a high-pressure solenoid valve according to a third embodiment.

FIG. 6 is a cross-sectional view showing a main part of a high-pressure solenoid valve according to a fourth embodiment.

FIG. 7 is a cross-sectional view showing a main part of a high-pressure solenoid valve according to a fifth embodiment.

FIG. 8 is a sectional view showing a main part of a high-pressure solenoid valve according to a sixth embodiment.

FIG. 9 is a sectional view showing a main part of a high-pressure solenoid valve according to a seventh embodiment.

FIG. 10 is a cross-sectional view showing a main part of a high-pressure solenoid valve according to an eighth embodiment.

FIG. 11 is a sectional view showing a schematic structure of a conventional high-pressure solenoid valve.

FIG. 12 is a sectional view showing a main part of a conventional high-pressure solenoid valve.

FIG. 13 is a schematic diagram for explaining a pressure relationship applied to a conventional high-pressure solenoid valve.

[Explanation of symbols]

 1 to 8 high-pressure solenoid valve 20 valve body 21 valve seat 22 valve body housing 23 recess 25 pilot pressure section 26 through hole 27 recess 28 packing as sealing means 32 pressure release hole

Claims (2)

[Claims] 1. A high-pressure fluid flow path is divided into a high-pressure side and a low-pressure side with a valve seat as a boundary, and a valve body abutting on the valve seat on the high-pressure side is provided at a distal end side of a valve body housing. Being fitted and held in the provided recess, and in a state where the valve body is in contact with the valve seat, a low-pressure side fluid pressure is applied to the pressure-receiving surface on the distal end side of the valve body, and the inner wall of the recess is formed. A gap with the valve body communicates from the high pressure side to the low pressure side, and the fluid pressure on the high pressure side or the fluid pressure on the low pressure side is switched and supplied to a base end pressure receiving surface of the valve body housing. Having an electromagnetic switching valve portion for
By switching the switching valve portion, changing the balance between the pressure received by the base end pressure receiving surface of the valve body housing and the pressure received by the distal end pressure receiving surface of the valve housing and the distal end pressure receiving surface of the valve body. A high-pressure solenoid valve that moves the valve body housing to contact or separate the valve body from or from the valve seat, wherein the high-pressure side and the low pressure are provided in the gap between the inner wall of the recess and the valve body. Seal means for partitioning the valve body from the valve body, wherein the seal means is arranged on the outer periphery of the valve body at a position outside a contact surface between the valve body and the valve seat. And high pressure solenoid valve. 2. The high-pressure solenoid valve according to claim 1, wherein the valve element has a recess for introducing the fluid pressure on the low-pressure side at a position opposite to the pressure-receiving surface on the tip side, and the recess is A high-pressure solenoid valve including a base-side pressure-receiving surface having the same area as the distal-side pressure-receiving surface of the valve element.