JPH024293Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a directional control valve used in industrial machinery that utilizes fluid pressure or vacuum pressure.

BACKGROUND ART Conventionally known directional control valves include a valve body provided in a valve body for inserting a valve body between a pair of valve seats in a valve chamber, as described in US Pat. No. 4,298,027, for example. The valve seat on one side of the chamber is provided in a valve seat body separate from the valve box so that that part can be opened, and after inserting the valve member into the valve chamber, this open part is closed with the valve seat body to open the valve. The box and the valve seat body formed a valve chamber.

However, according to such a configuration, one side of the valve seat is formed in the valve body and the other side is formed in the valve seat body, so when assembling the valve seat body to the valve body, the parallelism and concentricity of the valve seat are It was difficult to ensure that
In addition, since the parallelism and concentricity of the valve seat are often impaired, it is generally necessary to increase the sealing force of the valve member, which results in an increase in the operating force of the valve body and the associated valve This has the disadvantage that the life of the valve body is shortened due to accelerated wear and tear of the members.

Furthermore, a space is required to insert and fix the valve seat body in the valve body, which increases the size of the valve body or reduces the fluid circulation ability. This method not only requires an O-ring, but also increases costs due to an increase in the number of parts such as a valve seat body and an increase in assembly man-hours, and this tendency becomes more pronounced as the valve becomes smaller.

Problems to be solved by the invention This invention does not use a valve seat body, but instead forms a valve chamber and a pair of valve seats in one valve box, and pressurizes the valve body into the valve chamber. Therefore, it is an object of the present invention to provide a directional control valve that is compact and easy to assemble while ensuring the parallelism and concentricity of a pair of valve seats.

Means for Solving the Problems The present invention provides a first port, a second port, and a third port in the valve box, and a second port provided in the valve box at opposing positions in the valve chamber that communicates with these ports. 1
In a directional control valve in which the flow path between the ports is switched by opening and closing the valve seat and the second valve seat with a valve body, the valve is opened and closed from inside the second valve seat through a hole provided in the valve box. The valve body to be inserted into the chamber is constructed by fixing a valve member around a valve fitting, and the valve fitting is provided with an enlarged diameter portion whose diameter is slightly smaller than the inner diameter of the second valve seat. The valve member made of a flexible material and fixed to the valve fitting is provided with a first sealing part and a second sealing part facing the first valve seat and the second valve seat, and the valve member is provided with a first sealing part and a second sealing part facing the first valve seat and the second valve seat. The above problem can be solved by providing a pair of circumferential protrusions with a diameter slightly larger than the inner diameter of the seat, and by providing a valve groove between these circumferential protrusions that allows the circumferential protrusions to escape when the valve body is press-inserted. This solves the problem.

Function In the directional control valve having such a configuration, when the valve body is pressurized into the valve chamber provided in the valve body through the hole provided in the valve body, the first and second
The sealing portions are flexible, the sealing surfaces are inclined in a direction that facilitates the pressure insertion, and a valve groove is provided between the peripheral protrusions provided around the sealing portions. The peripheral protrusion is easily deformed to temporarily reduce its outer diameter, and the valve member can be inserted into the valve chamber without damage. After insertion into the valve chamber, the sealing part returns to its original outer diameter due to its flexibility, and the sealing part reliably closes the valve seat.

In this way, by press-inserting the valve body into the valve chamber, it is possible to manufacture the valve body from a single member, which ensures the parallelism and concentricity of the pair of valve seats, and at the same time is compact and compact. It is possible to obtain a directional control valve whose assembly is simplified.

Embodiment Referring to FIGS. 1 and 2, an embodiment of the present invention using electromagnetic drive will be described. 1
is a valve body made of a single member, and includes a first port 2, a second port 3, and a third port 4, each of which has a hole formed through the valve body 1. 5 and communicate with each other. The hole 5 is enlarged at the intersection with the second port 3, and the enlarged diameter part forms a valve chamber 6. A first valve seat 7 and a first valve seat 7, which communicate with the first port 2, are located at opposing positions of the valve chamber 6, respectively. A second valve seat 8 communicating with the 3-port 4 is formed. Note that 9 is a locking groove provided at the end of the hole 5 for locking the spring seat.

The valve body 10 inserted into the hole 5 has a valve fitting 11
The valve fitting 11 has a seal portion 12 in which a seal member 13 is fitted at each end, and an enlarged diameter portion 14 is provided in the center of the valve fitting 11, and a flexible material such as rubber is provided so as to cover the enlarged diameter portion 14. The valve member 15 is fixed by fitting or baking. This valve body 10 is
It is press-inserted into the valve chamber 6 through the hole 5 of the valve box 1, and is moved in the return direction by the return spring 17 interposed between the end thereof and the spring seat 16 locked in the locking groove 9. energized.

The enlarged diameter part 14 at the center of the valve fitting 11 is divided into two thick and thin sections to form a first enlarged diameter part 18 and a second enlarged diameter part 19. Slanted surfaces 20 and 21 are provided on both sides, respectively (see FIG. 2).

The valve member 15 fixed around the valve fitting has a first sealing part 25 that contacts and seals the second valve seat 7 and a second sealing part 26 that contacts and seals the second valve seat 8. , these sealing parts 25 and 26 are provided on the inclined surfaces 20 and 21 in a similarly inclined state. In addition, these sealing parts 25, 26
A valve groove 27 is provided on the outer peripheral surface between the valve grooves 27 and 27.
Peripheral protrusions 28 and 29 are provided protrudingly on both sides.

In the above embodiment, the diameters of the sliding parts of the seal part 12 at both ends of the valve body 10 are Da and Db, the outer diameter of the valve groove 27 of the valve member 15 is D0, and the circumferential protrusion at both ends of the valve groove 27 is The outer diameters of the parts 28 and 29 are D1 and D2, and the first
The inner diameters of the valve seat 7 and the second valve seat 8 are D3 and D4, the outer diameters of the first enlarged diameter part 18 and the second enlarged diameter part 19 of the valve fitting 11 are D5 and D6, and the outer diameter of the enlarged diameter part 14 of the valve fitting 11 is When the outer diameters of both sides are D7 and D8, D7≒D8＜D5≦D6＜D3≒D4≒Da≒D6≒＜D1
The relationship is ≒D2.

Further, when the valve body 10 is press-inserted into the valve chamber 6 through the hole 5, the valve member 15 is not damaged, and the sealing force of the valve is increased after the valve member 15 is inserted into the valve chamber 6. , and in order to prevent the sealing portions 25, 26 of the valve member 15 from separating from the valve seats 7, 8 due to the biasing force of the return spring 17 or the operation of the electromagnet described below, each of the diameters D0 to D8 has D1≧ D3+0.5, D2≧D4+0.5 D3−0.5>D5≧(D3+2D7)/3 D4−0.5>D6≧(D4+2D8)/3 D3, D4≧D0≧D5, D6 (unit: mm) There is.

In FIG. 1, reference numeral 31 denotes a push rod having one end abutted against a buffer member 32 at the end of the valve fitting 11 and a spring receiver 33 provided at the other end.
6 is passed through the movable iron core 35 and is biased by a spring 39 which is weaker than the return spring 17 and is interposed between the spring receiver 33 and the spring retainer 38 in the movable iron core 35. Further, 40 is an electromagnetic coil provided around the fixed iron core 34- and the movable iron core 35, and 41 is a magnetic frame surrounding the coil 40.

In the directional control valve having the above configuration, the hole 5
When the valve body 10 is press-inserted into the valve chamber 6 through the
2 is larger than the inner diameter D4 of the second valve seat 8, but the difference in diameter is small, and the circumferential protrusions 28, 29
A valve groove 27 is provided between them, and the fact that the diameter D0 of this valve groove 27 is smaller than the inner diameter D4 of the second valve seat, and that the valve member 15 is flexible, makes the valve As shown by the arrows in FIG. 3, the circumferential projections 28 and 29 of the member 15 partially escape to both sides of the enlarged diameter portion and the remaining portion escapes to the valve groove 27 side, so that the diameter thereof decreases. The second valve seat 8 can be removed without damaging the valve member 15.
, and is pressurized into the valve chamber 6. Then, the peripheral protrusions 28 and 29 after being inserted into the valve chamber 6
is restored to its original outer diameter due to its elasticity, and its peripheral protrusions 28, 29 also return to the state of sealing the valve seats 7, 8.

Next, the operation of the above-mentioned directional switching valve will be explained. As mentioned above, the biasing force of the return spring 17 is weaker than the biasing force of the spring 39, so when the electromagnetic coil 40 is not energized, the valve body 10 always moves upward and closes the first sealing portion. 25 closes the first valve seat 7 as shown in FIG.

When the electromagnetic coil 40 is excited by a power source (not shown), the movable iron core 35 is attracted to the fixed iron core 34,
The valve element 10 is moved downward by overcoming the urging force of the return spring 17, and the first sealing part 25 opens the first valve seat 7, and the second sealing part 26 closes the second valve seat 8.
Therefore, the first port 2 communicates with the second port 3 through the valve chamber 6. When the electromagnetic coil 40 is de-energized, the valve body 10 is moved upward by the biasing force of the return spring 17 and returns to the state shown in FIG. Second
The seal 26 opens the second valve seat 8 so that the second port 3 communicates with the third port 4 .

In such a switching valve, when the first sealing part 25 of the valve body 10 closes the first valve seat 7, as shown in FIG. Even if the fluid pressure is applied to the valve fitting 1
Since the seal is received by the valve member 15 attached to the inclined surface 20 on the first enlarged diameter portion 18 of 1, the circumferential protrusion 28 deforms and the valve member 15 separates from the first valve seat 7, thereby sealing. It will never be incomplete.

FIG. 4 shows another embodiment of the valve body 10, in which a recessed part 44 is provided in the middle of the enlarged diameter part at the center of the valve fitting 11, and the enlarged diameter part on both sides has the same diameter. The valve member 1 is formed around the enlarged diameter portions 45a and 45b.
5 peripheral protrusions 28 and 29 are formed.

FIG. 5 shows yet another embodiment of the valve body 10, in which holes 47 are provided in the valve fitting 11 on both sides of the enlarged diameter portion 14 and in the recessed portion 44, passing through the valve fitting 11 in a cross shape. and the valve member 15 is connected by a connecting portion 48 passing through these holes 47;
It is firmly fixed to the valve fitting 11.

In the illustrated embodiment, the directional control valve of the present invention is a solenoid valve, but the valve body 10
Of course, the operation is not limited to electromagnetism, but may also be mechanical operation or fluid pressure operation.

Effects of the invention The present invention provides a first sealing part and a second sealing part having a diameter slightly larger than the inner diameter of the valve seat in the valve member made of a flexible material of the valve body, and a valve member having a diameter slightly smaller than the inner diameter of the valve seat. By providing a valve groove located between the sealing parts with equal outer diameters, even if the valve body is pressurized into the valve chamber through the second valve seat, the sealing part will reduce its outer diameter and be damaged. Since the valve chamber and valve seat are formed only in the valve body without using a valve seat body, the parallelism and concentricity of the valve seat can be ensured by using the valve seat body. Not only is there no such trouble, but the size of the valve box can be reduced, and the number of parts and assembly man-hours can be reduced.

In addition, since the parallelism and concentricity of the valve seat are not impaired during use, there is no need to increase the sealing force of the valve member, and therefore there is no need to increase the operating force of the valve body. Wear and tear on the valve member is significantly reduced, prolonging its life, and the operating section can be made smaller.

Furthermore, the valve fitting of the valve body is provided with a first enlarged diameter part and a second enlarged diameter part whose diameter is slightly smaller than the inner diameter of the valve seat, and after the valve body is press-inserted, the side surfaces of these enlarged diameter parts are attached to the valve fitting. It supports the sealing part of the member and prevents the sealing part from deforming due to fluid pressure, etc., so even though the sealing part has a diameter that can be inserted under pressure, it is possible to prevent fluid from leaking from the valve seat. The diameter portion does not interfere with pressure insertion of the valve body.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an embodiment of the present invention as a solenoid valve, Fig. 2 is a longitudinal cross-sectional view showing an enlarged view of the valve chamber, and Fig. 3 is a longitudinal cross-sectional view showing the state when the valve body is inserted. The partial sectional view, FIGS. 4 and 5 are longitudinal sectional views showing other embodiments of the valve body, respectively. 1... Valve box, 2... First port, 3... Second port, 4... Third port, 5... Hole, 6... Valve chamber, 7... First valve seat, 8... Third port. 2 valve seats, 10...
Valve body, 11... Valve fitting, 15... Valve member, 18...
...First enlarged diameter part, 19... Second enlarged diameter part, 25... First sealing part, 26... Second sealing part, 27... Valve groove,
28, 29...peripheral protrusion.

Claims (1)

[Scope of utility model registration request] A first port, a second port, and a third port are provided in the valve box, and a first valve seat and a second valve seat provided at opposing positions of a valve chamber that communicates with these ports in the valve box are provided with a valve body. In a directional control valve that switches the flow path between the ports by opening and closing, the valve body is press-inserted into the valve chamber from within the second valve seat through a hole provided in the valve box, and the valve body is inserted into the valve chamber through a hole provided in the valve body. The valve fitting is provided with an enlarged diameter portion having a slightly smaller diameter than the inner diameter of the second valve seat, and a flexible member is fixed to the valve fitting to cover the enlarged diameter portion. The valve member made of wood is provided with a first sealing part and a second sealing part facing the first valve seat and the second valve seat, and a pair of sealing parts having a diameter slightly larger than the inner diameter of the valve seats are provided around the first sealing part and the second sealing part. A circumferential protrusion is provided, and between these circumferential protrusions,
A directional control valve characterized in that a valve groove is provided for allowing a peripheral protrusion of the valve body to escape when the valve body is pressurized.