JPH0861544A - Structure of fluid control valve - Google Patents

Abstract

PURPOSE: To provide a valve structure for fluid control valve, with which degra dation of the rate-of-flow characteristics due to pressure loss is prevented in case the lift is very small and also the hole machining is facilitated to ensure reduced costs. CONSTITUTION: A fluid control valve.in which a main valve 6 of poppet type is installed in a flow path leading from a bulkhead to the inlet is structured so that a disc 16 as a valve element having a valve element part at the valve seat is mounted in the valve stem end of the main valve 6, wherein a communication hole 17 in communication with the inlet is formed in the valve stem, and a plurality of flowout holes 27, 27a in communication with the hole 17 are furnished in the circumferential direction at the periphery near the valve element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid control valve having a poppet type valve that opens and closes a valve opening, and in particular, reduces flow resistance that affects the flow rate when the valve lift amount is small to improve flow rate characteristics. The present invention relates to a valve structure in a fluid control valve that is made good.

[0002]

2. Description of the Related Art Conventionally, as this type of fluid control valve a,
As shown in FIG. 7, the valve disc disk d is attached to the lower end of the valve shaft body c whose vertical movement is controlled by the solenoid b, and the inflow hole f communicating with the inlet e is provided in the valve shaft body c. It is known to have a poppet type valve in which a flow dividing hole g branched from f is formed laterally in the valve shaft c.

However, in the fluid control valve a, pressure loss occurs in the fluid because the flow path is bent at a right angle in the process of flowing from the valve shaft c to the valve opening h. When the lift amount δ is 1/4 or more of the diameter D of the valve opening h, the pressure loss does not affect the flow rate at all, however, the lift amount δ is less than 1/4 of the diameter D of the valve opening h. In a small range, the pressure loss affects the flow rate, which causes a decrease in the flow rate and deteriorates the flow rate characteristics.

In addition, at the time of machining, the flow dividing hole g must be formed in the lateral direction of the cylindrical valve shaft body c. For this reason, since it differs from the machining axis of the inflow hole f, the position of the work is changed, A jig for positioning is required, which is troublesome, and has a drawback that the processing cost rises.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the inflow path from the outflow hole to the valve opening is made as straight as possible, and the outflow is caused by the flow of a part of the fluid flowing into the valve opening from the outside of the valve body. Some of the fluid that flows in from the hole is drawn in, and the fluid that flows into the outflow hole is rectified by the rectification passage to prevent deterioration of the flow rate characteristics due to pressure loss, especially when the lift amount is extremely small, and it is easy to machine the hole The present invention provides a valve structure for a fluid control valve that controls the opening and closing of a valve opening with a poppet type that reduces cost.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of flow rate characteristics and the like in a range where the lift amount is small based on the above-mentioned prior art. An outlet hole that allows the fluid to flow into the valve chamber from the outer periphery near the valve disc that has a unique grounding surface, and the fluid path to the valve opening is infinitely linear to reduce pressure loss and reduce the lift amount. The present invention aims to solve the above-mentioned drawbacks by providing a valve structure in a fluid control valve whose purpose is to reduce the flow rate loss and improve flow rate characteristics.

The inlet and the outlet are divided by a partition wall, and a valve body having a valve opening formed in the partition wall and a poppet-type main valve that opens and closes the valve opening by opening and closing the valve seat around the valve opening are provided with the partition wall and the inlet. 2 is a valve structure of a fluid control valve arranged in a flow path between and.

A valve disc having a frustoconical valve disc portion in which a minimum contact surface for seating on a valve seat is formed at the end of the valve stem of the main valve is attached to the valve disc. A communication hole that communicates with the inlet is formed in the body, and a plurality of outflow holes that communicate with the communication hole are provided in the circumferential direction around the valve body portion, or an outflow hole is provided in the valve disk itself.

Also, the main valve can be adapted to be controlled by a solenoid, and further, a cone cylinder portion whose diameter is expanded downward is formed outside the magnetic circuit in the communication hole in the valve shaft body, and the cone cylinder portion is formed in the cone cylinder portion. The pressure loss can be further reduced by forming the conical rectifying protrusions provided on the upper surface of the valve disc.

Moreover, a part of the opening at the lower end of the opening of the outflow hole near the central axis of the valve disc may be overlapped with the guide surface of the valve body in the diametrical direction with respect to the central axis.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which 1 is a fluid control valve according to the present invention, and the fluid control valve 1 has a valve port 4 communicating an inlet 2 and an outlet 3. The valve body 5 includes a poppet-type main valve 6 that opens and closes the valve opening 4, and a solenoid 7 that controls the main valve 6. The lift amount δ of the main valve 6 controlled by the solenoid 7 is defined by the valve opening 4 The diameter is set to be smaller than 1/4 of the diameter D.

The valve body 5 is composed of a valve tube body 8 containing a main valve 6 made of a non-magnetic material and an inlet joint 9 made of a magnetic material. The former valve tube body 8 is formed in a cylindrical shape, and the lower end thereof is formed. The outlet 3 is formed on the side, and a mounting port 10 for screwing the inlet joint 9 is formed on the upper end side, and a partition wall 11 that divides the mounting port 10 and the outlet 3 is formed. The port 4 is formed, and the valve seat 12 is formed so as to project from the periphery of the valve port 4 toward the mounting port 10 side.

The upper end portion 12a of the valve seat 12 is formed in a rounded shape, and the side wall surface 12b thereof is formed in a tapered shape, and the valve seat 12 is projected as shown by the one-dot diagonal line X in FIG. The flat part of the partition wall 11 around the valve opening 4 is not
However, there was no effect on the flow rate characteristics described later.

When the valve seat 12 is a flat portion, it is necessary to eliminate the caulking portion 34 or thin the caulking portion 34 so that at least the caulking portion 34 described later does not interfere with the partition wall 11. .

The latter inlet joint 9 is formed in a columnar shape, the lower end side of which forms a core portion 13, the upper end side of which an inlet 2 is formed, and the center of the core portion 13 is continuous from the inlet 2. An inflow hole 14 opening to the lower end side of the passage is formed.

The main valve 6 is arranged between the partition wall 11 of the valve body 5 and the inlet 2, and functions as a plunger whose magnetic attraction is controlled by the core portion 13 of the inlet joint 9 and the valve cylinder 8. Has the function of sitting on the valve seat 12 and closing the valve opening 4, and forms a cylindrical valve shaft body 15 from a magnetic material.
The outer diameter of 15 is slightly smaller than the inner diameter of the valve cylinder 8 so that it can be moved up and down in the valve cylinder 8. The valve seat 15 has a valve seat 12 at the lower end thereof. The valve disc 16 to be seated is attached.

Further, a communication hole 17 is formed in the center of the valve shaft body 15 so as to vertically penetrate therethrough, and an upper side of the communication hole 17 is formed in a diameter-expanded shape to form a spring insertion cylinder portion 18 and A valve disc mounting portion 21 composed of a cone cylinder portion 19 and a two-stage cylinder portion 20 is formed, in which the lower side that does not cause magnetic loss in a magnetic circuit to be described later is successively expanded in diameter downward.

The valve disc 16 is made of a sealing material such as rubber, synthetic resin, or metal, and is a two-stage cylindrical portion 20.
At the center of the lower surface of the disk-shaped disk body 22 that matches the inner diameter of the large-diameter portion 20a of the frustoconical cone so as to form a minimum contact surface for seating on the valve seat 12 of the valve opening 4 in a poppet manner. The valve body 23 in the shape of a ring is integrally projected downward.

Further, since the valve body portion 23 is provided in the shape of a truncated cone, the guide surface 24 which is the peripheral side wall thereof is formed in a tapered shape, but the guide surface 24 formed in such a tapered shape.
May have a rounded shape, and in this case, the surface area of the guide surface 24 increases, so that the fluid guiding action described later is further improved.

A cone-shaped rectifying projection 25 is integrally projected upward at the center of the upper surface of the disk main body 22, and the valve disk 16 is attached to the valve shaft body 15.
When mounted on the valve disc mounting portion 21, the rectifying projection 25, the cone tubular portion 19, and the small diameter portion 20b of the two-stage cylindrical portion 20 form a rectifying passage 26 that expands in a cone shape.

Outlet holes 27, 27a which penetrate the upper and lower surfaces of the disk body 21 in the circumferential direction around the valve body portion 23 of the disk body 22 and communicate with the rectifying passage 26.
And a part of the opening portion near the central axis CL of the valve disc 16 at the lower opening end of the outflow holes 27, 27a.
The guide surface 24 of the valve body 23 in the diametrical direction with respect to the central axis CL
Is overlapped with.

The valve disc 16 is mounted on the large-diameter portion 20a of the two-stage cylindrical portion 20 of the valve disc mounting portion 21, and then the outer peripheral side of the valve disc 16 is fixed by the caulking portion 34. .

In addition, a cone cylinder portion 19 is provided on the valve shaft body 15 of the main valve 6,
Although the valve disc mounting portion 21 composed of the two-stage cylindrical portion 20 is provided, the structure is not limited to this. For example, such a portion can be integrally formed as the valve disc 16, and in this case, the magnetic circuit. Since it is also outside, there is no magnetic loss, so that it is possible without making the solenoid 7 large.

Then, the inlet joint 9 is screwed to the valve cylinder 8, the main valve 6 is vertically movably mounted in the valve chamber 28 in the valve cylinder 8, and a spring is inserted above the main valve 6. A spring 29 is arranged in the tubular portion 18, the main valve 6 is biased downward by the elastic force of the spring 29, and the main body 6 is seated on the valve seat 12 by a valve disc 16 attached to the lower end of the main valve 6. The valve opening 4 is closed.

The solenoid 7 has a coil 31 having a predetermined number of turns wound around a bobbin 30 having an inner diameter through which the valve body 5 is inserted, and a yoke 32 having a U-shaped cross section and made of a magnetic material.
Is arranged around the coil 31, and the yoke 32, the core portion 12 of the inlet joint 9 and the upper side of the main valve 6 form a magnetic circuit.

Reference numeral 33 in the drawing denotes a communication groove formed on the outer peripheral surface of the valve shaft body 15 in the vertical direction.

Next, regarding other embodiments of the fluid control valve 1, common parts will be omitted and only different parts will be described. The fluid control valve 1a shown in FIG. A valve disc 16 is attached to the lower end of the valve 15, and the diameter of the communication hole 17 at the center of the valve shaft 15 is smaller than that of the valve disc 16 and has a bottomed shape. Outflow holes 27, 27a ... Are formed in the circumferential direction on the outer side in the vicinity of the disk 16.

In the fluid control valve 1b shown in FIG. 6, the diameter of the communication hole 17 in the center of the valve shaft body 15 of the main valve 6 is larger than that of the valve body disk 16 and is bottomed. Outflow holes 27, 27a ... Are formed in the circumferential direction outside the vicinity of the valve disc 16 from the bottom of the communication hole 17.

As a structure common to the fluid control valves 1a and 1b, the lower portion of the valve disc 16 is projected from the lower end of the valve shaft 15, and the protruding portion is formed as the valve body 23. are doing.

Although the lift amount δ of the main valve 6 in the fluid control valve 1 of the present embodiment is set to be smaller than 1/4 of the diameter D of the valve opening 4, the setting is not limited to this, and it is essential. Since the purpose is to improve the flow rate characteristic in the range of the lift amount δ smaller than ¼ of the diameter D, the main valve 6 is vertically moved by the solenoid 7 and only the opening / closing operation of the valve port 4 is performed. Is not limited to the electromagnetic fluid control valve 1 as described above, the main valve 6 has a communication hole 17 and outflow holes 27, 27a ... And a pressure reducing valve for controlling the opening and closing of the valve port 4 by a poppet type, a relief valve, and Can also be applied to a flow rate control valve that arbitrarily adjusts the lift amount δ of the main valve 6 to vary the flow rate.

Next, the operation of the fluid control valve according to the present invention will be described. First, regarding the flow of fluid, the solenoid 7 is actuated, and the magnetized core portion 13 in the inlet joint 9 which is a part of the magnetic circuit is used. Main valve 6 to spring 29
The upper end of the main valve 6 is moved up against the resilience of the main valve 13 until it abuts the lower end of the core portion 13 to adsorb and hold the valve disc 16 by a predetermined lift amount δ from the valve seat 12. The valve port 4 is opened by detaching it.

Then, the fluid flowing from the inlet 2 passes through the inflow hole 14 and the communication hole 17 and the valve shaft body 15 and the valve disk 16
Through the outflow holes 27, 27a, ..., To the outside through the valve port 4 and the outlet 3.

In such a flow state, the outflow holes 27, 27
Since a ... Is provided in the circumferential direction in the vicinity of the valve opening 4, the inflow path to the valve opening 4 can be made as linear as possible, and the valve of the disc body 16 can be opened from the lower end of the opening of the outflow holes 27, 27a. Body
Since 23 is projected downward and the tapered or rounded guide surface 24 is formed, a part of the fluid flowing into the valve chamber 28 is directed from the outer peripheral side of the valve body portion 23 toward the center of the valve opening 4. A part of the fluid flows out in the circumferential direction when flowing out
The smooth flow without any resistance along the guide surface 24 between the 27, 27a, ...
A part of the fluid flowing in is drawn in and flows toward the center of the valve opening 4.

Further, all the structures, dimensions, etc. are the same and the valve seat is
When the fluid control valve 1 in which the flat portion of the partition wall 11 was formed as the valve seat 12 without being projected was tested, no difference was found in the flow rate characteristics. It is presumed that the above-mentioned entrainment phenomenon occurs because the fluid flowing along 24 and the fluid flowing from the outflow holes 27, 27a ... Are overlapped in the circumferential direction.

Moreover, in the case where the flow regulating projection 24 is provided in the cone tubular portion 19, when flowing between the cone tubular portion 19 and the flow regulating projection 24, the flow-out hole is rectified into a cone shape. 2
7, 27a… Inflow into.

Further, it is recognized that the flow rate characteristics of the fluid control valves 1, 1a ... And the flow rate characteristics of the conventional fluid control valve are clearly improved as compared with the conventional one as shown in FIG. It was

It should be noted that, of course, the objects to be compared differ only in the valve structure, and all other specifications are data obtained under the same conditions.

Next, the main valve 6 in the fluid control valves 1, 1a ...
In regard to the machining, since the open ends of the outflow holes 27, 27a ... Are formed at the ends of the valve shaft body 15, it is possible to machine all the holes from one direction which is the axial direction of the valve shaft body 15. In addition, in the case where the valve disc 16 is formed separately, the cone-shaped rectifying path 26 can be formed by simply making a hole in the valve shaft 15.

[0039]

In summary, the present invention divides the inlet and the outlet by the partition wall, and the valve body having the valve opening formed in the partition wall and the poppet type for opening and closing the valve opening by opening and closing the valve seat around the valve opening. In the fluid control valve in which the main valve of the main valve is arranged in the flow path between the partition wall and the inlet, the ground plane that is the minimum necessary for seating on the valve seat 12 is formed at the end of the valve shaft body 15 of the main valve 6. A valve disc 16 having a valve body portion 23 is mounted, a communication hole 17 communicating with the inlet 2 is formed in the valve shaft body 15, and the discharge holes 27, 27a ... Since a plurality of holes 27, 27a, ... Are provided in the circumferential direction in the vicinity of the valve opening 4 because a plurality of them are provided in the circumferential direction in the vicinity of the portion 23, the inflow path to the valve opening 4 is infinitely linear. And circumferential outflow holes
Since a part of the fluid flowing from the outflow holes 27, 27a ... Is drawn into the valve opening 4 by the flow of a part of the fluid flowing into the valve opening 4 through the flow path between 27, 27a. In comparison with the fluid control valve a having a valve structure in which a right angle bending path is formed to cause pressure loss due to vortex flow, especially when the lift amount δ is significantly smaller than the diameter D of the valve opening 4 (less than 1/4). It is possible to prevent deterioration of the flow rate characteristics due to pressure loss, and to prevent the outflow holes 27, 27
Since the open end of a is formed at the end of the valve shaft 15, all holes can be drilled from one direction, which is the axial direction of the valve shaft 15. Therefore, it is possible to reduce the cost by eliminating the need for a jig or the like.

Further, since the valve body portion 23 is projected downward from the end of the valve shaft body 15 and the protruding portion is frustoconical, the guide surface 24 is formed on the outer peripheral wall of the valve body portion 23. As a result, when a part of the fluid that has flowed into the valve chamber 28 flows from the outer peripheral side of the valve body portion 23 toward the center of the valve opening 4, a part of the fluid is provided in the circumferential direction in the outflow holes 27, 27a. By smoothly flowing without any resistance along the guide surface 24 between them, a part of the fluid flowing in from the outflow holes 27, 27a ... Is drawn in by the flow and flows to the valve port 4, so that the above-mentioned flow rate characteristic is obtained. It can be further improved.

Further, the outflow holes 27, 27a which communicate with the communication hole 17 ...
Since a plurality of are provided in the circumferential direction around the valve body portion 23 of the valve body disk 16, the valve body disk 16 can be manufactured as a separate body and can be integrally formed at a lower cost than metal working. In addition, the cone-shaped flow rectifying path 26, which will be described later, can be formed by simply making a hole in the valve shaft body 15.

Further, a part of the opening portion near the central axis CL of the valve disc 16 at the lower end of the opening of the outflow holes 27, 27a.
Since it overlaps with the guide surface 24 of the outer peripheral wall of the valve body portion 23 in the diameter direction with respect to the central axis CL, the outflow hole 27,
Fluid flowing along the guide surface 24 between the 27a ...
Since there is a portion where the fluids flowing from 27a ... Join, the flow-through characteristic can be further improved by efficiently performing the pull-in phenomenon.

Further, a cone tube portion 19 whose diameter is expanded downward is formed on the lower side of the communication hole 17 in the valve shaft body 15, and the cone tube portion 19 is formed.
Since the conical rectifying projection 25 disposed inside is formed on the upper surface of the valve disc 16, the cone tubular portion 19 and the rectifying projection 25 can form a rectifying passage 26 that expands in a cone shape, whereby the outflow holes 27, 27a. It is possible to rectify the fluid that flows into the ..., Therefore, it is possible to eliminate the pressure loss at such a portion, so that the above flow rate characteristics can be further improved.

Further, since the poppet type main valve 6 is controlled by the solenoid and the cone tube portion 19 is formed outside the magnetic circuit inside the valve shaft body 15, the cone tube portion 19 is outside the magnetic circuit, so that the magnetic field is reduced. Since no loss occurs, it is possible to deal with the main valve 6 and the solenoid 7 without increasing the size thereof.

Accordingly, the lift amount δ of the directional control valve, the pressure reducing valve, the relief valve, and the main valve 6 which are electromagnetic, mechanical and manual fluid control valves for controlling the opening / closing of the valve port 4 by the poppet type.
The amount of lift δ in the flow rate control valve for adjusting the flow rate by arbitrarily adjusting the flow rate can be improved in a range in which the lift amount δ is smaller than 1/4 of the diameter D of the valve opening 4, and the practical effect thereof is extremely large. It is a thing.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fluid control valve according to the present invention when operating and when not operating.

FIG. 2 is an enlarged sectional view of a valve structure of the fluid control valve of the above.

FIG. 3 is an enlarged sectional view of a valve structure according to another embodiment of the same.

FIG. 4 is an enlarged sectional view of a valve structure according to another embodiment of the same.

FIG. 5 is a top perspective view of the valve disc.

FIG. 6 is a bottom perspective view of the same valve disc.

FIG. 7 is a cross-sectional view showing an operating state and a non-operating state of a conventional fluid control valve.

FIG. 8 is a flow rate characteristic graph of the fluid control valve of the present invention and the conventional fluid control valve.

[Explanation of symbols]

 6 Main valve 12 Valve seat 15 Valve shaft body 16 Valve body disk 17 Communication hole 19 Cone cylinder portion 23 Valve body portion 24 Guide surface 25 Rectification protrusion 27, 27a… Outflow hole

Claims (6)

[Claims] 1. A partition wall which divides an inlet and an outlet by a partition wall and has a valve opening formed in the partition wall, and a poppet-type main valve which opens and closes the valve opening by opening and closing the valve seat around the valve opening. In a fluid control valve arranged in the flow path between the inlet and the inlet, a valve body having a valve body portion in which a minimum ground contact surface for seating on the valve seat is formed at the end of the valve shaft body of the main valve. While mounting the disk, forming a communication hole that communicates with the inlet in the valve shaft body,
A valve structure in a fluid control valve, wherein a plurality of outflow holes communicating with the communication holes are provided in a circumferential direction around a valve body portion. 2. The valve structure for a fluid control valve according to claim 1, wherein the valve body portion is projected downward from the end portion of the valve shaft body, and the protruding portion is formed into a truncated cone shape. 3. The valve structure for a fluid control valve according to claim 1, wherein a plurality of outflow holes communicating with the communication holes are provided in the circumferential direction around the valve body portion of the valve body disk. 4. A part of an opening portion near the central axis of the valve disc at the lower end of the opening of the outflow hole is overlapped with a guide surface of an outer peripheral wall of the valve body in a diameter direction with respect to the central axis. The valve structure in the fluid control valve according to claim 2 or 3. 5. A cone tube portion having a downwardly expanding diameter is formed on a lower side of a communication hole in the valve shaft body, and a conical rectifying projection disposed in the cone tube portion is formed on an upper surface of the valve disk. The valve structure in the fluid control valve according to claim 1, 2, 3, or 4. 6. The valve structure for a fluid control valve according to claim 5, wherein the poppet type main valve is controlled by a solenoid, and the cone cylinder is formed outside the magnetic circuit.