JP2006258183A - Poppet type direction control valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a poppet type direction changing valve, in which supply flow area can be set large, achieving excellent stability and manufacturability of a poppet valve seal part. <P>SOLUTION: This direct or pilot-actuation type pressure fluid direction changing valve is provided with a pressure balance type poppet valve included in a main valve part main body, and composing more than two serially connected poppet parts, and a valve seat body in which part of a valve seat to which a poppet of the pressure balance type poppet valve is sealed is position-adjustable to the moving direction of the poppet. A guide part for the moving direction of the poppet is provided in a poppet outer circumferential part. Both a tip part and a rear end part of the valve seat body that is position-adjustable to the moving direction of the poppet are composed to be slidable in an engagement state in the valve main body part main body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a direction switching valve mechanism that switches a fluid flow directly by electromagnetic force, mechanical force, or the like, or switches a fluid flow by a pilot operation method, and more particularly to a poppet type multi-directional switching valve.

Conventionally, as such a directional control valve, for example, a poppet type directional control valve described in Patent Document 1 has been known.
Japanese Patent Publication No. 5-35313

  In the conventional poppet type directional control valve, the guide of the movable poppet part is formed between the connecting shaft part between the two poppets and the guide hole of the valve body. The poppet seal stability tended to deteriorate. In addition, since the fluid passage is formed in the guide portion, there is a problem that the flow area of the supply fluid (air) cannot be increased.

In addition, in the conventional poppet type directional control valve, in the structure of the valve body, in order to ensure the flow rate of the inner diameter part of the body where the poppet is located, the guide is formed on the tip side of the valve seat body screwed from both sides. A large-diameter recess hole was formed, making it difficult to process.
Furthermore, in the conventional poppet type directional control valve, the guide of the valve seat body is only the tip portion described above, and when screwed into the valve body, the sealing performance between the valve seat portion and the movable poppet portion is caused by the fall of the end face. There was a risk of lack of stability.

  The present invention has been made to solve such conventional problems, and its purpose is to provide a poppet type directional switching valve that can provide a large supply flow area and is excellent in stability and manufacturability of the poppet valve seal portion. Is to provide.

  In order to achieve the above object, the poppet type directional control valve of the present invention is a direct or pilot operated type pressure fluid directional control valve, which is built in the main valve body, and two or more connected poppets connected in series. And a valve seat body that can adjust the position of a part of the valve seat to which the poppet of the pressure balance poppet valve is sealed with respect to the movement direction of the poppet. A guide part in the poppet moving direction is provided on the outer periphery of the poppet, and both the front and rear end parts of the valve seat body that can be adjusted in position relative to the poppet moving direction are fitted in the main valve body. It is configured to slide on.

  According to the present invention, there is an advantage that the supply flow area can be increased, the stability of the poppet valve seal portion can be achieved, and the manufacturability is excellent.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 5 show a poppet type directional switching valve according to an embodiment of the present invention.
As shown in FIGS. 1 and 2, the poppet type direction switching valve according to the present embodiment has a main valve portion V, a solenoid S for driving a valve attached to the side of the main valve portion V, and a bottom surface side of the main valve portion V. And an attached sub-base B. The sub-base B may be a single unit or may be connected like a manifold.

  As shown in FIGS. 1, 2, and 4, the main valve portion V includes a main valve portion main body 10 having a substantially rectangular parallelepiped shape. The main valve portion main body 10 has a through hole 11 penetrating the substantially central portion in the longitudinal direction. The through hole 11 has a first hole 11 a located substantially at the center of the main valve body 10. Second holes 12a and 12b having the same diameter and the same diameter as the first hole 11a are concentrically connected to both ends of the first hole 11a. And the annular valve seats 13a and 13b are formed in the both ends of the 1st hole 11a with the form protruded to the 2nd holes 12a and 12b side. Third holes 14a and 14b having the same diameter and larger diameter than the second holes 12a and 12b are concentrically connected to the end portions of the second holes 12a and 12b, respectively. Screw holes 15a and 15b having the same diameter as the third holes 14a and 14b are concentrically connected to the end portions of the third holes 14a and 14b, respectively. Fourth ends 16a, 16b having the same diameter and larger diameter than the screw holes 15a, 15b are concentrically connected to the respective ends of the screw holes 15a, 15b. Further, on the bottom surface of the main valve body 10, an opening IN (for supplying fluid such as air) communicating with the first hole 11 a located in the center and openings CYL 1 and CYL 2 communicating with the second holes 12 a and 12 b are provided. (Connection passage with a driving means such as an actuator) and openings OUT1 and OUT2 (for discharging fluid such as air) communicating with the third holes 14a and 14b are formed at intervals.

A poppet valve structure is formed in the through hole 11 of the main valve body 10 as shown in FIG. Here, a poppet valve is formed between the poppet portion 20 that forms the poppet valve between the valve seats 13a and 13b provided at both ends of the first hole 11a in the central portion, and both outer sides of the poppet portion 20. Valve seat bodies 30 and 40 are incorporated.
As shown in FIGS. 1, 2, and 5, the poppet portion 20 includes a cylindrical shaft 21 disposed in the first hole 11 a in the center portion with a gap between the hole wall and the outer periphery, and a cylinder It is composed of annular poppets 22 and 23 arranged on both sides of the shaft 21. The poppets 22 and 23 are positioned at the step portions 21c and 21d of the shaft portions 21a and 21b that are reduced in diameter by one step on both ends of the cylindrical shaft 21, and push the end of the cylindrical shaft 21 toward the poppets 22 and 23. It is fixed by caulking. The distance between the step portions 21a and 21b formed on the cylindrical shaft 21 is set longer than the distance between the valve seats 13a and 13b formed in the main valve body 10 by the valve stroke, and the cylindrical shaft 21. The valve seats 24 and 25 of the poppets 22 and 23 are attached so as to be perpendicular to the axis. The valve seats 24 and 25 of the poppets 22 and 23 are formed on both sides of the poppets 22 and 23. As shown in FIGS. 1 and 5, the annular grooves 22a and 22b and 23a and 23b on both sides are at the bottoms. The through holes 22c and 23c formed at intervals are communicated. In this embodiment, the rubber materials constituting the valve seats 24 and 25 are integrally fixed by means such as baking, and then the seat surface is finished by machining such as polishing.

  As shown in FIGS. 2 and 3, the poppet portion 20 constitutes a guide portion with the main valve portion main body 10 side on the outer peripheral portions of the poppets 22 and 23. As shown in FIGS. 3 (a) and 3 (b), a large number (in this case, eight) of protrusions 22d and 23d are integrally formed on the outer periphery of the poppet portion 20 at intervals. It is configured to fit into the hole walls of the second holes 12a and 12b of the main valve body 10, and a fluid passage is formed between the protrusions 22d and 23d.

  The poppet part 20 is assembled to the main valve part 10 by a method as shown in FIG. First, one poppet 22 is inserted into the shaft portion 21a at one end of the cylindrical shaft 21, positioned to the stepped portion 21c, and integrated by caulking. Here, the caulking portion is indicated by 21e. Next, this shape is inserted into the main valve portion 10, and the other poppet 23 is inserted into the shaft portion 21b from the opposite side, pressed against the stepped portion 21d, and the end portion 21f of the shaft portion 21b is spread with a tool (not shown). Integrated by caulking. In this way, the poppets 22 and 23 are mounted in the main valve body 10.

  On the other hand, the valve seat body 30 is attached to the second hole 12a, the third hole 14a, the screw hole 15a, and the fourth hole 16a of the main valve body 10 and is formed at the tip thereof. A poppet valve is formed between the annular valve seat 31 and the valve seat 24 of the poppet 22, and the second hole 12b, the third hole 14b, the screw hole 15b, and the fourth hole 16b on the opposite side Is mounted with a valve seat body 40, and a poppet valve is formed between the annular valve seat 41 formed at the tip of the valve seat body 40 and the valve seat 25 of the poppet 23. The outer diameter portion 32 connected to the valve seat 31 of the valve seat body 30 is fitted into the second hole 12a, and the opposite end is expanded to fit into the fourth hole 16a to form a flange portion 33. The screw 34 cut between the two fitting portions is screwed into the screw hole 15a. This screw portion allows fine adjustment of the valve seat position at the tip. Similarly, the outer diameter portion 42 connected to the valve seat 41 of the valve seat body 40 is fitted into the second hole 12b, and the opposite end is expanded to fit into the fourth hole 16b, so that the flange portion 43 is fitted. And a screw 44 cut between both fitting portions is screwed into the screw hole 15b. Similarly, the screw portion enables fine adjustment of the valve seat position at the tip. Sealing bodies 90, 91, 92, 93, 94 are attached to the fitting portions of the two valve seat bodies 30, 40, respectively.

As shown in FIG. 1, the poppet type directional switching valve according to the present embodiment thus configured has a connecting member integrally mounted on the movable iron core P on the inner diameter portion of the valve seat body 30 on the solenoid S side. 50 is stretched by a spring 70 so that the end face of the poppet 22 is pressed leftward in the drawing.
An operating rod 60 is slidably inserted into the other valve seat body 40, and the tip (left end portion in the figure) has a main valve portion main body 10 by a spring 80 stretched between the end face of the poppet 23. Projecting from the end face constitutes a manual operation unit. Further, a penetrating passage is formed in the radial direction at the distal end side of the connecting member 50 and the distal end side of the operation rod 60, and the exhaust passages (OUT1, OUT2) are communicated with each other by the inner diameter hole 21g of the poppet portion 20. It has a pressure balance structure.

The poppet type directional control valve according to the present embodiment configured as described above has a larger supply flow area than the conventional one, and is excellent in stability and manufacturability of the poppet valve seal portion.
Moreover, in this embodiment, since the guide part of both the poppet parts 20 was changed from the center part to the poppet outer periphery, it became possible to show the following effects.
Since the support portions of the poppets 22 and 23 are close to the seal portions of the poppets 22 and 23 and the span is widened, the play of the poppets 22 and 23 is reduced. As a result, the seal stability was improved.

Since the bearing area can be increased, the wear on the sliding part is remarkably reduced. In particular, when the sliding portion is made of resin, the effect is further remarkable.
The guide lot can be narrowed and the supply flow rate can be increased. Overall, the flow rate is increased by 30 to 50%.
The molding cost of the guide lot was reduced by half.

Since the recess groove is eliminated from the structure of the main valve portion main body 10, the main valve portion V can be made of resin by injection molding, and the manufacturing cost can be greatly reduced. Moreover, since the valve seat shape which comprises a poppet valve can be formed more correctly, the cost reduction effect is large also in this point.
Assembly adjustment becomes easier and man-hours can be reduced.
By making it resin, it can be used for excellent low dust generation valves, oil-prohibiting valves, etc., and product development can be achieved.

Furthermore, since the guide of the poppet portion 20 is provided from the central shaft portion to the outer periphery of the poppet on both ends, the central shaft portion can be formed narrower and the supply flow rate of fluid (air) can be increased.
Since the guide portions (fitting portions) of the valve seat bodies 30 and 40 are fitted not only at the front end portion but also at the rear end portion, the sealing performance between the valve seat portion and the movable poppet portion at the end face is stabilized.

In this embodiment, the shape and quantity of the guide part (protrusion) formed on the outer periphery of the poppet can be selected as appropriate, and an optimum design is given in consideration of the surrounding area serving as an air passage. Is possible.
Further, when the parallelism of the valve seats 24 and 25 is more necessary, the poppets 22 and 23 can be achieved by baking the rubber and then machining it accurately to finish (polishing etc.).

In the above embodiment, the valve seat portions 24 and 25 on both sides formed on the poppets 22 and 23 are configured by vulcanizing and baking rubber on the groove portions formed on the poppets 22 and 23. For example, an annular valve seat can be attached with an adhesive or the like.
Moreover, in the said embodiment, although the poppet part united the two poppets 22 and 23 to the both ends of the cylindrical shaft 21 by the caulking means, it is also possible to use an adhesive if it is possible in terms of strength. .

  Moreover, in the said embodiment, although the main valve part V eliminated the recess groove part from the inside so that resin molding is possible, it is not specified to resin molding and it can manufacture other than resin by another shaping | molding means.

It is a front sectional view of the poppet type directional control valve concerning one embodiment of the present invention. It is an AA arrow line view of FIG. 3A is a perspective view of the poppet shown in FIG. 2, and FIG. 3B is a side view of the poppet shown in FIG. It is front sectional drawing of the main valve part main body of FIG. It is sectional drawing explaining the condition which assembles a poppet in the main valve part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main valve part main body 11 Through hole 11a First hole 11a, 11b Second hole 13a, 13b Valve seat 14a, 14b Third hole 15a, 15b Screw hole 16a, 16b Fourth hole 20 Poppet part 21 Cylindrical shaft 21a, 21b Shaft portion 21c, 21d Stepped portion 21e Caulking portion 21f End portion 22, 23 Poppet 22a, 22b, 23a, 23b Ring portion 22c, 23c Through hole 22d, 23d Protrusion portion 24, 25 Valve seat 30, 40 Valve seat body 31, 41 Valve seat 33, 43 collar 50 connecting member 60 actuating rod 70, 80 spring B sub-base 90, 91, 92, 93, 94 seal body P movable iron core S solenoid V main valve

Claims (3)

A pressure balance type poppet valve that constitutes a poppet that is built in a through hole in the main valve body and that is connected in series with two or more, and a part of a valve seat that seals the poppet with respect to the movement direction of the poppet In a poppet type directional switching valve provided with a position adjustable valve seat body,
A guide portion in the poppet moving direction is provided on the outer periphery of the poppet, and both the front and rear end portions of the valve seat body are slid in the main valve portion main body with respect to the poppet moving direction. A poppet type directional switching valve characterized by comprising:   2. The poppet type direction switching valve according to claim 1, wherein the guide portion is formed of protrusions formed at a predetermined interval on the outer periphery of the poppet. The poppet type direction switching valve according to claim 1, wherein a through hole in the main valve portion main body penetrates the longitudinal direction of the main valve portion main body, and the pressure balance type poppet valve is formed at a central portion in the longitudinal direction. An opening having a shaft portion disposed therein and the valve seats provided on both sides thereof, and an opening formed in a symmetrical shape in the longitudinal direction with respect to the opening, the opening formed in the symmetrical shape includes two valve seats A poppet-type direction switching valve, wherein a body is screwed and a sliding portion at the tip of the valve seat body and the guide portion are located.

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