JPH0643874B2 - Electromagnetic flow control valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flow control valve used in a circuit for moving a fluid device according to a purpose, and in particular, when necessary, a valve element is biased toward a valve seat. The present invention relates to an electromagnetic flow control valve capable of controlling force and continuously changing flow rate or pressure.

(Prior Art) A flow control valve is used for adjusting the flow rate of a fluid circuit and adjusting the movement speed of an actuator and the rate of pressure increase. , Fine adjustment is possible, and stable and continuous characteristics are required.

The most common is the needle valve. This uses a screw to move a needle valve having a conical tip forward or backward to change the valve opening. However, it has many problems due to its structure. It is difficult to eliminate looseness in the screw part, inconsistency of the axis line between the orifice and the needle valve, etc., and the change in screw rotation angle and valve opening are not constant, and accurate flow rate adjustment or pressure adjustment is not possible. There was a drawback to say. Further, the wear of the threaded portion was also a big problem.

On the other hand, as a flow rate control valve developed to solve the mechanical problem described above, for example, there is a valve shown in FIG. 4 (a). In this valve, a valve seat member 2 having a valve seat 2a having a substantially conical inner surface is fixed to an inlet 1a of a pressurized fluid of a housing 1,
The valve body 3 capable of making line contact with the inner surface of the valve seat 2a is displaced by the throttle adjusting plate 4 capable of being displaced in the axial direction of the valve seat member 2 so that the pressurized fluid flowing between the valve seat and the valve body is displaced. It controls the flow rate. In order to shift the diaphragm adjusting plate 4 made of a magnetic material in the axial direction, the valve seat member 2 should be opposed to the diaphragm adjusting plate 4.
It suffices to change the magnetic force of the electromagnets 5 that are spaced apart from each other to change the attraction force that acts on the adjusting plate 4. That is, the force for biasing the valve body toward the valve seat (hereinafter referred to as the throttling force) can be continuously adjusted by changing the current or voltage that acts on the coil that constitutes the electromagnet, so the operation is easy and the screw There is no mechanical problem called backlash.

(Problems to be Solved by the Invention) However, in the electromagnetic flow control valve having the above-described configuration, when the throttle adjusting plate 4 comes into contact with the spherical valve body 3, the throttle adjusting plate 4 is provided with the axis line of the valve seat member 2. It is easy to abut with a certain inclination, not at right angles to the direction, and since this inclination changes each time the flow rate is adjusted and is not always constant, the flow rate or pressure of the pressurized fluid discharged from the discharge port 1b changes, and the flow rate is accurate. Has the drawback of being difficult to control. Further, the diaphragm adjusting plate 4 and the spherical valve body 3 are apt to vibrate by self-excitation, which is also a cause of oscillation when performing feed bark control. This problem is caused by using, for example, two electromagnetic flow control valves (20a, 20b) described above, and using these valves as the voltage control means 2
1 electrically connected to each other via a respective valve 20
In the servo valve shown in FIG. 4 (b), the set pressure p is changed by changing the voltages acting on a and 20b in an interlocking manner so as to be opposite to each other and adjusting the throttle forces f ₁ and f ₂ to change the set pressure P. Is especially noticeable when changing.

Therefore, in order to prevent self-excited vibration caused by so-called dance between the diaphragm adjusting plate 4 and the spherical valve body 3, the axial gap formed between the diaphragm adjusting plate 4 and the sealing member 6 is reduced. It was also possible to set it so that the throttle adjustment plate would not easily vibrate around the spherical valve body, but since the movable range of the valve body is reduced and the controllable flow rate is also reduced, it is There arises a problem that the characteristics are deteriorated. In particular, there has been a big problem with a spherical valve element having a large diameter of 5 mm or more.

(Means for Solving the Problems) In order to solve this problem, in the electromagnetic flow control valve of the present invention, particularly, the movement of the throttle adjusting plate in the axial direction extending in the axial direction of the valve seat member is guided. The guide member is provided on the diaphragm adjusting plate.

(Operation) In the electromagnetic flow control valve configured as described above, the throttle adjusting plate always moves in the axial direction of the valve seat member by the guide member that guides the movement in the axial direction, and moves in the direction perpendicular to the axial line. There is no movement of the or around the spherical valve body. Therefore, the conventional problems due to the inclination of the diaphragm adjusting plate do not occur. Further, regardless of the size of the gap between the throttle adjusting plate and the sealing member, that is, the gap in the axial direction of the valve seat member and the gap in the direction perpendicular to the axial direction,
Since the diaphragm adjustment plate can be moved in the axial direction, the degree of freedom in design is great.

(Embodiment) An electromagnetic flow control valve of the present invention will be described below with reference to the drawings. In the drawing, the same reference numerals as those in FIG. 4 denote the same components.

FIG. 1 (a) shows a preferred embodiment of the present invention.

Reference numeral 1 denotes a housing, which has an inlet 1a for the pressurized fluid and an outlet 1b. The valve seat member 2 is fixed to the inlet 1a of the housing 1. The valve seat member 2 has an O-ring 8a.
Is inserted and the inlet 1a and the valve seat member 2 are sealed. As shown in FIG. 1 (b), this valve seat member 2 has a mouthpiece portion 9 at one end for reliably and easily supplying pressurized fluid, and a valve member 3 having a spherical valve element 3 abutting at the other end. It is a hollow member provided with each seat 2a, and the pressurized fluid flows in this hollow passage. In the present embodiment, the mouthpiece 9 and the valve seat 2a are formed integrally with the valve seat member 2, but they may be formed separately.

The valve seat 2a has a substantially conical inner surface so as to make line contact with the valve body 3. Further, in consideration of the fact that a steel ball is usually used as the valve element, it is advantageous to form the valve seat 2a of alumina or silicon carbide ceramics in order to improve the wear resistance of the contact portion. On the other hand, if a valve body made of plastic, preferably acetal resin, is used instead of steel balls, the valve body can be made lighter. Moreover, it is possible to almost eliminate the noise generated when the valve seat collides with the valve seat or the throttle adjusting plate, and further it is possible to improve the life of the contact portion. It also has great chemical resistance. Therefore, the control valve including the valve body 3 may be appropriately selected according to the applied pressurized fluid and the purpose of use thereof.

The drive means including the electromagnet 5 and the casing 10 is fixed to the housing 1 concentrically with the axis of the valve seat member 2 while being separated from the valve seat member 2. The casing 10 surrounding the electromagnet 5 is
In this embodiment, an opening is provided at a portion facing the diaphragm adjusting plate 4 which is arranged in the recess 11 provided on the side of the sealing member 6 facing the housing so as to be axially displaceable. therefore,
The magnetic force generated in the electromagnet 5 acts on the diaphragm adjusting plate 4 with this opening portion being radiated, and shifts the diaphragm adjusting plate in the axial direction according to an electric signal acting on the electromagnet. The driving means may be provided continuously in an annular shape or discretely provided in an annular shape.

A guide member 12 that slides along the inner wall surface 10a of the casing 10 is fixed to the diaphragm adjusting plate 4 in order to guide the movement in the axial direction. The guide member 12 is made of a non-magnetic material so as not to be affected by the magnetic force generated by the electromagnet, guarantees its function as a guide member, and is fixed to the diaphragm adjusting plate 4 made of a magnetic material. The member 12 directly presses the spherical valve body 3 toward the valve seat. In addition, preferably, as shown in the present embodiment, the metal sheet 1 is provided on the end surface of the guide member that abuts on the spherical valve body 3.
The contact surface of the guide member 4 is prevented from being damaged in a short period of time by fixing 4 and repeatedly colliding the guide member and the valve body.

Then, the O-ring 8b is inserted into the opening end of the housing 1, and the sealing member 6 is sealed and fixed to the housing using the fastening bolt 7.

In this embodiment, the recess 11 is provided in the sealing member 6 in order to allow the movement of the diaphragm adjusting plate 4 in the axial direction, but the diaphragm adjusting plate 4 can be moved in the axial direction in the housing 1. The driving means may be the housing 1 in that case.
It is provided so as to be shifted to the introduction port 1a side. Further, in order to absorb the inertial force acting on the diaphragm adjusting plate, a low elastic sheet, for example, urethane foam is arranged on the recess 11 or one side of the tightening adjusting plate facing the recessed part to absorb the inertial force. The vibration of the diaphragm adjusting plate can be prevented more reliably.

A supply source of pressurized fluid, for example, an air compressor (not shown), is connected to the mouthpiece portion 9 of the electromagnetic flow valve having such a configuration.
The connecting pipe connected to is sealed and connected. Pressurized air from the air compressor passes through the hollow portion of the valve seat member, pushes up the valve element 3 to the right in FIG. 1 (a), passes through the flow control valve, and is seal-connected to the discharge port 1b. It flows into another connecting pipe (not shown). At this time, in order to reduce the outflow amount of the pressurized air from the discharge port 1b, an electric signal is applied to the electromagnet 5 of the driving means to move the throttle adjusting plate 4 in the valve seat direction, that is, in the left side in FIG. 1 (a). Move towards. Then,
The guide member 12 fixed to the throttle adjusting plate presses the valve body 3 to the left at the point where the force of the pressurized air acting on the valve adjusting plate 3 and the force of the electromagnet acting on the throttle adjusting plate are balanced, The opening area between the seat 2 and the valve body 3 is reduced to limit the flow rate or pressure of the pressurized air passing through the valve. At this time, the guide member 12
Moves in the axial direction along the drive means, specifically the inner wall surface of the casing 10. Moreover, since the diaphragm adjusting plate 4 is integrally fixed to the guide member 12, the diaphragm adjusting plate 4 can be moved only in the moving direction of the guide member 12. Therefore, the flow control valve without the static and dynamic problems in the conventional electromagnetic flow control valve is obtained.

In this embodiment, the guide member 12 is provided so as to face the valve body. However, the guide member 12 is fixed to the surface of the diaphragm adjusting plate 4 on the sealing member 6 side and extends in the axial direction of the sealing member. It may be configured to move in the slot. Also in this case, since the throttle adjusting plate can be moved only in the axial direction, there is no problem in the known flow control valve.

FIG. 2 (a) shows another embodiment of the electromagnetic flow control valve of the present invention.

This embodiment also has a configuration similar to that of the first embodiment (a), but in this embodiment, the housing 1 has only the inlet 1a for the pressurized fluid. The pressurized fluid introduced into the housing through this inlet is discharged through the outlet 1c provided in the sealing member 6. Therefore, as shown in FIG. 2B, the through hole 1 is formed in the diaphragm adjusting plate 4 and the guide member 12 fixed to the diaphragm adjusting plate and made of a non-magnetic material.
5a and 15b are provided. That is, in the embodiment shown in FIG. 2 (b), the through hole 15a communicating with the discharge port 1c provided in the sealing member 6 and extending in the axial direction of the valve seat member 2 is provided in the diaphragm adjusting plate 4. Four pieces are provided, and further, the through holes are extended in the axial direction to form the groove holes 15b on the outer surface of the guide member 12. Therefore, it is introduced from the inlet 1a of the housing,
The pressurized fluid that has passed through the opening portions of the valve seat 2 and the valve body 3 passes through the flow passage formed between the casing 10 and the groove hole 15b of the guide member 12 and the through hole 15a provided in the throttle adjusting plate 4. Through the discharge port 1c and is discharged to the outside of the valve.

It should be noted that it is possible to form a through hole in the throttle adjusting plate 4 even in the conventional electromagnetic type flow valve and to let the pressurized fluid flow out from the discharge port 1c provided in the sealing member. In addition, since the diaphragm adjusting plate 4 vibrates violently around the valve body, it cannot fully function as a flow control valve. On the other hand, in the control valve of the present invention, the throttle adjusting plate 4 can be displaced in the axial direction and cannot move in any direction other than that direction. The advantage is that the outlets can be arranged on the same axis.

In the diaphragm adjusting plate 4 and the guide member 12 shown in FIG. 2 (c), the groove hole provided in the guide member 12 is formed into a substantially flat shape, and a guide protrusion (not shown) provided in the casing 10 is provided.
Two guide grooves 16 that engage with are formed on the outer surface thereof. Therefore, the diaphragm adjusting plate 4 can be displaced in the axial direction without rotating about its axis.

In this embodiment, the through hole 15a provided in the diaphragm adjusting plate 4 is used.
Although the groove hole 15b is formed on the outer surface of the guide member by extending the groove, it is needless to say that the groove hole may be the through hole 15b, and the number of the groove hole and the through hole can be appropriately changed.

FIG. 3 shows another embodiment of the present invention. This embodiment is an electromagnetic flow control valve that has a throttle adjusting plate and a spherical valve body that is pressed by the throttle adjusting plate, and can also function as a servo valve. An electromagnetic flow control valve A having the same configuration as the embodiment shown and an electromagnetic flow control valve B having the same configuration as the embodiment shown in FIG. 1A are connected to each other. . The sealing member 6 of the control valve A is provided with a port 17 that intersects the discharge port 1c and extends outward. The housing 1d of the other control valve B is fixed to the sealing member of the control valve A, so that the flange 18 is provided to seal and fix the sealing member 6.

In the electromagnetic type flow control valve configured as described above, in order to control the pressurized fluid discharged from the port 17, the control valve A
If the electric signals acting on the electromagnets of the respective valves are adjusted so that the valve opening degree of the valve B decreases when the valve A increases the valve opening degree of the valve A and the control valve B, for example. good.
This will be clear from the description below.

Now, consider pressurized air as the pressurized fluid, and assume that the pressure at the time of being supplied from the supply source (not shown) to the valve A is P ₀ and the pressure at the port is P. On the other hand, the outlet 1e of the valve B is open to the atmosphere. Further, assuming that the effective area of each valve element is A, and the forces generated by the respective electromagnets and pressing each valve element are f _A and f _B , the following equations hold.

P ₀ the input voltage to the _{A ≦ f A + PA ≦ f} B wherein the electromagnet coil and _{V a,} the electromagnetic force and the input voltage is caused is _{proportional,} f _{A =} P 0 A-
When an input voltage is applied so that the relationship of KV _a , f _B = KV _a (where K is a proportional constant) is established, the above formula becomes P ₀ A− (P ₀ A−KV _a ) ≦ PA ≦ KV _a , Becomes This means that the pressurized air flowing out of the port 17 can be adjusted freely by changing the input voltage to the coil.

In the embodiment shown in FIGS. 2 and 3, in order to reduce the inertial force acting on the diaphragm adjusting plate and prevent the diaphragm adjusting plate from vibrating more reliably, the diaphragm adjusting plate and the sealing member are provided between the diaphragm adjusting plate and the sealing member. ,
For example, a low elasticity sheet such as urethane foam may be provided.

The discharge port 1c may be provided in the sealing member 6a similarly to the valve A, and the guide member 12a and the throttle adjusting plate 4a may be provided with groove holes and through holes, respectively, so that the pressurized fluid may flow in the axial direction. Is.

(Effects of the Invention) As described in detail above, in the electromagnetic flow control valve of the present invention, the guide member that extends in the axial direction of the valve seat member and that guides the movement of the throttle adjusting plate in the axial direction is adjusted. Since it is provided on the plate, the diaphragm adjustment plate faithfully presses the valve element toward the valve seat, and various problems due to vibration of the diaphragm adjustment plate, which have been a problem in conventional devices, do not occur, and the coil of the electromagnet is not affected. (EN) A control valve having excellent static and dynamic characteristics, which takes advantage of the characteristics of an electromagnetic flow control valve capable of freely adjusting the valve opening degree in accordance with an acting electric signal.

Further, since the throttle adjusting plate slides in the axial direction of the valve seat member and its movement is restricted in a direction other than the axial direction, vibration problems occur even if the pressurized fluid is configured to flow through the throttle adjusting plate. There is no such thing. Therefore, not only the discharge port for the pressurized fluid can be provided so as to intersect with the axial direction of the introduction port, but also the discharge port for the pressurized fluid can be provided in parallel with or on the same axis line as the axial direction of the introduction port, so that the degree of freedom in design is large. Since two valves can be integrally connected in series, it is not necessary to separately install a control valve. Therefore, there is an effect that the labor of piping and sealing is reduced and a compact device can be obtained.

[Brief description of drawings]

FIG. 1 (a) is a sectional front view showing a first embodiment of an electromagnetic flow control valve of the present invention, and FIG. 1 (b) shows a valve seat member and a valve body shown in FIG. 1 (a). FIG. 2 (a) is a sectional front view showing the second embodiment of the present invention, and FIGS. 2 (b) and 2 (c) are the sectional front views showing the embodiment shown in FIG. 2 (a). The figure which shows a suitable guide member and diaphragm adjustment plate, FIG. 3 is a sectional front view showing a third embodiment of the present invention, and FIG. 4 (a) is a sectional front view showing a known electromagnetic flow control valve. FIG. 4 (b) is a diagram showing the operating principle of a servo valve using the valve seat member shown in FIG. 4 (a). 1, 1d ... Housing, 1a ... Inlet port 1b, 1c, 1e ... Outlet port, 2 ... Valve seat member 3 ... Valve body, 4, 4a ... Throttle adjusting plate 5 ... Electromagnet, 6, 6a ...... Sealing member 7 ...... Fastening bolts 8a, 8b, 8c, 8d ...... O-ring 9 ...... Mouthpiece 10 ...... Casing 10a ...... Inner side surface (casing) 11 ...... Recesses, 12, 12a ...... Guide Member 14 ... Metal sheet, 15a ... Through hole 15b ... Groove hole, 16 ... Guide groove 17 ... Port

Claims (6)

[Claims] 1. A housing having an inlet and an outlet for pressurized fluid, and a valve seat member connected to the inlet and extending inward of the housing, having a valve seat having a substantially conical inner surface.
A spherical valve body that can be in line contact with the conical inner surface of the valve seat, and a magnetic material that is disposed to face the valve seat via the valve body and that can be displaced in the axial direction of the valve seat member. An electromagnetic flow control valve comprising: a throttle adjusting plate; drive means having an electromagnet fixed to the housing for biasing the throttle adjusting plate toward the valve seat; and a sealing member for sealing the housing. An electromagnetic flow control valve, wherein a guide member that extends in the axial direction of the valve seat member and guides the movement of the adjusting plate in the axial direction is provided in the throttle adjusting plate. 2. The electromagnetic flow control valve according to claim 1, wherein the guide member slides in an axially extending slot provided in the sealing member. 3. The electromagnetic flow control valve according to claim 1, wherein the guide member is made of a non-magnetic material, and the guide member presses the valve body along the inner wall surface of the drive means. . 4. The electromagnetic flow control valve according to claim 3, wherein the guide member is provided with a metal sheet at a contact portion with the valve body. 5. A discharge member is provided in a sealing member, and a through hole penetrating the diaphragm adjusting plate is extended in the axial direction to provide a groove and / or a through hole in the guide member. The electromagnetic flow control valve according to item 3 or item 4. 6. A sealing member provided with the discharge port is provided with a port branching from the discharge port, and another housing having another discharge port is fixed to the sealing member.
Another valve seat member that communicates with the discharge port of the sealing member and extends into another housing, a spherical valve body that can make line contact with the valve seat having the conical inner surface of the other valve seat member, and this valve Another throttle adjusting plate, which is arranged to face the other valve seat through the body and is fixed with another guide member for guiding the movement in the axial direction, and the other throttle adjusting plate. 7. An electromagnetic system according to any one of claims 1 to 6, further comprising: another driving unit having an electromagnet that shifts to another position; and another sealing member that seals the other housing. Flow control valve.