JP3025707B2 - Step rotary valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step rotary valve for controlling the flow rate of a fluid by rotating a valve body in a forward / reverse direction by flowing a forward / reverse current to one coil.

[0002]

2. Description of the Related Art Conventional step rotary valves include:
Some actuators use a stepping motor. When the stepping motor is used as an actuator, the number of pulses applied to the motor is controlled to move the valve body up and down to control the distance from the valve seat, and to adjust the amount of fluid flowing from the inlet port to the outlet. It is discharged from the port.

[0003]

In a step rotary valve using a stepping motor as the actuator, the flow rate is determined by the number of magnets and magnetic pole teeth and the number of applied pulses in the motor. There is a problem that the flow rate control corresponding to the rotation angle or less in one step of the rotor cannot be performed.

An object of the present invention is to solve the above-mentioned problems. An object of the present invention is to control the flow rate by controlling the flow rate of a fluid at a position where the flow rate is constant. The present invention is to provide a step rotary valve capable of finely controlling the flow rate and controlling a minute flow rate.

[0005]

SUMMARY OF THE INVENTION A step rotary valve according to the present invention achieves the above-mentioned object.
An excitation coil, a suction element disposed in the excitation coil,
A clutch coil disposed on an end face of the suction element, a plunger that is sucked when the suction element is energized and holds the suction state by the clutch coil when the current is cut off, and a plunger attached to an outer periphery of the plunger. A permanent magnet having S and N poles alternately magnetized, and the same number of magnetic pole teeth as the number of magnetic poles of the permanent magnet arranged on the outer periphery of the permanent magnet and magnetized to S or N pole by energizing the excitation coil A magnetic pole tooth plate, a spring biasing the plunger in a direction opposite to the direction of suction of the plunger, and a number of saw teeth formed on a surface of the plunger opposite to the surface facing the suction element. A movable guide having a plurality of saw teeth fixedly disposed opposite to the movable guide, and a fluid fixed between the plunger and a valve seat. Flow rate is obtained by including a valve member comprising a valve body for adjusting.

The valve member is slid and rotated by a plunger, and a valve body having a shaft hole and at least one communication hole communicating with the shaft hole is formed. A bearing tube in which a communication hole communicating with the communication hole when being moved by a spring and having a size that closes the communication hole when the plunger is attracted by the exciting coil is formed, and an end face of the bearing tube; And a second fluid outflow / inflow pipe communicating with the shaft hole of the valve body and communicating with the communication hole of the bearing pipe.

[0007]

In the step rotary valve of the present invention constructed as described above, the plunger is attracted by energizing the exciting coil, and the magnetic pole teeth of the magnetic pole tooth plate are magnetized to either S or N. The plunger slightly rotates in the forward or reverse direction due to the line of magnetic force with the permanent magnet formed on the outer periphery of the outer periphery of the plunger. Since the magnetization of the magnetic pole teeth is in the opposite direction, the magnetic pole teeth further rotate in the rotation direction and rotate by one step. When the power supply to the exciting coil is cut off, the plunger moves by the spring force of the spring, and the teeth of the movable guide and the fixed guide mesh with each other, so that the plunger is fixed. Thereby, the flow hole of the valve body and the communication hole of the bearing tube coincide with each other, and the flow rate of the fluid is controlled.

In the above state, once a current is applied to the exciting coil, the plunger slightly rotates but is attracted by the suction element, and the communication hole communicating with the communication hole is closed by the bearing tube. When the current is cut off, the plunger returns to its original position, and the fluid flows through the communication hole of the valve body and the communication hole of the bearing tube. Therefore, the flow rate per unit time can be controlled by repeating the energization and the cutoff of the excitation coil.

[0009]

Next, an embodiment of the present invention will be described with reference to FIGS. In the present invention, the actuator A includes an actuator A and a valve member B for controlling the flow rate of the fluid by the actuator A.

First, the structure of the actuator A will be described. 1 is a casing, 2 is a ring-shaped exciting coil housed on the outer peripheral surface of the casing 1, and 3 is fitted and fixed above the exciting coil 2. As a suction element, a spring housing hole 3a opened downward at the center is formed, and a ring hole 3b for housing the bear coil 4 is formed on the lower surface.

Reference numeral 5 denotes a magnetic pole tooth plate having a large number of comb-shaped (eight in the illustrated case) magnetic pole teeth 5a, which are fixed in such a manner as to be embedded in the inner peripheral surface at the lower end of the exciting coil 2. ing. Reference numeral 6 denotes a tube fixed in close contact with the inner peripheral surface of the exciting coil 2 (from the lower part of the suction element 3 to the upper part of a valve body 10 to be described later) in order to maintain the nectarity, and 7 denotes a plunger formed of a magnetic material. A cylindrical permanent magnet 8 in which a large number of S and N poles (16 poles in the illustrated example) are alternately magnetized is fitted on the outer periphery.

On the outer peripheral surface of the plunger 7, projections 7a are formed by the number of the permanent magnets 8 (eight), and the center of each projection 7a is located between the magnetic poles of each permanent magnet 8. The permanent magnet 8 is fitted on the plunger 7.
A lower part of the plunger 7 below the permanent magnet 8 is formed with a saw-tooth-shaped movable guide 7b projecting from the lower surface corresponding to the projection 7a. Is formed.

9 is the excitation coil 2 of the casing 1
As a fixed guide member fitted and fixed to the lower surface of the hole, a fixed guide 9a meshing with the movable guide 7b is formed, and a hole 9b communicating with a center hole 7c of the plunger 7 is formed at the center. .

Next, the structure of the valve member B will be described. Reference numeral 10 denotes a valve body fixed to the lower surface of the casing 1 and a bearing tube 11 is fixed at the center. It communicates with the hole 9b of the fixed guide member 9. Reference numeral 12 denotes a valve body having the above-described spring receiving hole 3a of the suction element 3, a center hole 7c of the plunger 7, and a shaft hole 12a inserted into the bearing tube 11, and 13 denotes a ball stored at the upper end in the spring receiving hole 3a. , 14 are springs interposed between the ball 13 and the upper end of the valve body 12.

At least one or, in the present embodiment, up to seven through holes 12b are formed in a portion of the valve body 12 corresponding to the inside of the bearing tube 11. A communication hole 11a is also formed in the bearing tube 11 so as to face the communication hole 12b, and a fluid inflow or fluid outflow tube 15 is connected to the communication hole 11a by means such as welding or the like. A fluid outflow or fluid inflow pipe 16 is similarly connected to the lower end of 11.

Further, the bearing tube 11 of the valve body 10
A ring-shaped flow groove 10a through which a fluid flows is formed on the outer circumference where the communication hole 11a is located. The size of the communication hole 11a is larger than the size of the communication hole 12b,
Further, when the valve element 12 is raised by an operation described later, all of the communication holes 12b corresponding to the communication holes 11a are formed so as to be separated from the communication holes 11a.

Next, the operation based on the above-described configuration will be described with reference to FIG.
It is explained together with. FIG. 3A shows a state in which the excitation coil 2 is not energized. In this state, the plunger 7 is pressed by the spring 14 and is in a lowered state, and the valve body 12 is also in a lowered position. Further, since the plunger 7 is lowered, it is in mesh with the movable guide 7b ₁ and the fixed guide 9a _1. On the other hand, the relationship between the permanent magnet 8 and the magnetic pole tooth plate 5 is such that the gap between the permanent magnets 8 faces the center of the magnetic pole teeth 5 a of the magnetic pole tooth plate 5.

In this stopped state, the bearing tube 1
If the one communication hole 11a and the flow hole 12b of the valve body 12 are located at opposing positions, the fluid flows through the fluid inflow pipe 15, the flow hole 11a,
When the fluid flows out to the fluid outflow pipe 16 through the communication hole 12b, and the communication hole 12b is not at the position facing the communication hole 11a,
Since the flow hole 11a is closed by the bearing tube 11, the flow of the fluid is stopped.

Next, when the excitation coil 2 is energized, the attraction element 3 is excited to attract the plunger 7 against the spring force of the spring 14. When the excitation coil 2 is energized, the magnetic pole tooth plate 5 is magnetized to S or N (in the positive direction in FIG. 3B, the N pole) depending on the energization direction. The permanent magnet 8 is slightly rotated clockwise from the state shown in FIG. 3A to the clockwise direction as shown in FIG. 3B from the state shown in FIG. In this state, the movable guide 7b ₁ is moved in the left direction with respect to the fixed guide 9a _1, valley portion of the movable guide 7b ₁ is not exceed crests of the fixed guide 9a _1.

Next, when the energizing coil 2 is instantaneously switched from the energizing in the forward direction to the energizing in the reverse direction, the plunger 7 is held in the attracted state by the magnetic force of the kumatri coil 4 and the magnetic pole tooth plate 5 moves in the reverse direction ( As shown in FIG. 3 (c), the permanent magnet 8 is magnetized to the N pole,
Due to the suction and repulsion action with a, it is further rotated clockwise. In this state, the movable guide 7b ₁ from the state of (b) of FIG. 3 is moved in the left direction, and stops at a position where the valley portions of the movable guide 7b ₁ exceeds the ridges of the fixed guide 9a _1.

When the power supply to the exciting coil 2 is cut off, the magnetic force generated by the attracting element 3 and the bear coil 4 disappears, so that the plunger 7 is lowered by the spring force of the spring 14. At this time, the movable guide 7b ₁ is a fixed guide 9a ₁ and mesh with further 3 plunger 7
As shown in (d) of FIG.
moved by one tooth of a ₁ stops. In this state, the communication hole 11a and the next communication hole 12b coincide with each other, and the flow rate of the fluid changes.

The flow rate of the fluid determined in the above-described operation depends on the diameter of the flow hole 12b. In order to further control the flow rate at this diameter, the energization and de-energization of the exciting coil 2 are repeated. Thus, the plunger 7 reciprocates between FIG. 3B and FIG. 3A.

That is, when the plunger 7 is suctioned by the suction element 3, that is, when the valve body 12 is raised, the flow hole 12b is disengaged from the communication hole 11a and the bearing tube 11
Fluid flow is shut off. When the plunger 7 is no longer sucked, the plunger 7 descends.
The fluid flows from the fluid inflow pipe 15 toward the fluid outflow pipe 16 when b and the communication hole 11a coincide. Therefore, the flow rate per unit time can be controlled by repeating the above operation at regular time intervals.

In the above description of the operation, the direction of the first energization to the exciting coil 2 is assumed to be the positive direction, and the pole tooth plate 5
Has been described in which the plunger 7 is rotated in the clockwise direction. However, in order to rotate the plunger 7 in the counterclockwise direction, the direction of the first energization to the exciting coil 2 is set to the opposite direction. 5 can be performed by magnetizing the N pole.

FIG. 4 is a view in which the shape of the communication hole 12b of the valve body 12 is changed.
While b is a round hole, the communication hole 11b and the communication hole 12c in FIG. 4 are long holes formed on the same circumference. And
The rotation of the valve body 12 in the same manner as in the above-described embodiment changes the opening of the flow hole 12c, so that the flow rate control changes. The width of the elongated hole is naturally large enough to be separated from the communication hole 11b and hidden in the bearing tube 11 when the valve body 12 is raised.

[0026]

As described above, the present invention attracts the plunger by energizing the exciting coil and magnetizes the magnetic pole teeth of the magnetic pole tooth plate to attract and repel the permanent magnet disposed on the outer periphery of the plunger. By rotating the plunger, the valve body is rotated to make the communication hole of the bearing tube coincide with the communication hole of the valve body, and when the plunger returns to the original position, the movable and fixed guides having a sawtooth shape mesh. Since the positional relationship between the communication hole and the communication hole is fixed, the flow rate of the fluid can be accurately controlled.

Further, by repeating the energization and interruption of the exciting coil in a state where the communication hole and the communication hole coincide with each other, the communication and the communication between the communication hole and the communication hole are repeatedly performed. At times, the flow rate per unit time can be controlled, and therefore, the flow rate of the fluid can be finely controlled.

[Brief description of the drawings]

FIG. 1 is an overall vertical sectional view of the present invention.

FIG. 2 is an exploded perspective view of a main part.

FIGS. 3 (a) to 3 (d) are a plan view of a plunger and side views of a movable guide and a fixed guide for explaining the operation.

FIG. 4 is a perspective view of a valve body according to another embodiment.

[Explanation of symbols]

 2 Exciting coil 3 Attractor 4 Kumatori coil 5 Magnetic pole tooth plate 5a Magnetic pole tooth 7 Plunger 7b Movable guide 8 Permanent magnet 9 Fixed guide member 9a Fixed guide 11 Bearing pipe 11a, 11b Communication hole 12 Valve body 12b, 12c Communication hole 14 Spring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16K 31/00-31/11 G05D 7/00

Claims (2)

(57) [Claims] 1. An exciting coil, a suction element disposed in the excitation coil, a bear coil disposed on an end face of the suction element, and a suction element in a state where the suction element is energized and cut off the energization. A plunger that holds the attracted state by the bear coil in this state, a permanent magnet attached to the outer periphery of the plunger, and S and N poles are alternately magnetized, and a plunger arranged on the outer periphery of the permanent magnet and connected to the exciting coil. A magnetic pole tooth plate having the same number of magnetic pole teeth as the magnetic poles of the permanent magnet that is magnetized to the S or N pole by energization, a spring that biases the plunger in a direction opposite to a direction in which the plunger is attracted, A movable guide having a number of saw teeth formed on a surface of the plunger opposite to the surface facing the suction element, and a plurality of saw teeth fixedly disposed to face the movable guide; And a valve member comprising a valve body fixed to the plunger and adjusting a flow rate of a fluid between the valve seat and the valve seat. 2. The valve body, wherein the valve member is slid and rotated by a plunger, and a valve body having a shaft hole and at least one communication hole communicating with the shaft hole is formed. A bearing tube in which a communication hole is formed in a state in which the communication hole communicates with the communication hole in a state where it is moved by a spring, and a communication hole having a size to close the communication hole in a state where the plunger is attracted by the exciting coil; The above-mentioned claim, further comprising a first fluid inflow / outflow pipe connected to the end face and communicating with the shaft hole of the valve body, and a second fluid outflow / inflow pipe communicating with the communication hole of the bearing pipe. Item 1. The step rotary valve according to Item 1.