JPS61109982A - Electrically powered valve - Google Patents

Abstract

PURPOSE:To prevent the control fluid from leaking outside by disposing a separator between the stator and rotor that functions as a pressure-resistant member and is made of nonmagnetic material in a hollow cylindrical shape. CONSTITUTION:A separator 5 that is made of nonmagnetic material in a hollow cylindrical shape with a bottom is fixedly attached to the upper part of the valve body 10 with a packing 15 interposed. The rotor 3 of magnetic material is rotatably contained inside the separator, however, its vertical movement is regulated by the packing 15. The spindle of the rotor 3 and the valve body 4 are joined by screwing, and the valve body 4 is moved vertically by the rotation of the rotor. A stator 2 that has an armature coil 1 to receive the electrical input is disposed around the separator 5, which in cooperation with the rotor makes up a stepping motor.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an electrically operated valve that opens and closes a fluid passage using a valve that rotates in response to electrical input, and particularly relates to an electrically operated valve that prevents external leakage of control fluid. .

Specifically, the present invention relates to an electric valve suitable for use when fluid flowing through a fluid flow path is a flammable gas, a toxic gas, or the like.

``Prior Art J'' A conventional motor-operated valve is clearly described, for example, as described in Japanese Patent Application Laid-open No. 178117/1983, in which a stepping motor drives and controls a valve shaft that controls the opening and closing of a fluid flow path. .

According to this, the valve shaft is directly connected to the drive shaft of the stepping motor to prevent external leakage of control fluid (pressure leakage).
To prevent this, an O-ring was placed on the valve stem as a shaft seal. However, there is a risk that the control fluid may leak from this shaft seal to the outside, causing flammable gas (propane gas,
The drawback was that it could not be used to control urban waste (city scum) or toxic gases. In addition, although external leakage can be suppressed by improving this sealing performance, the sliding resistance and frictional resistance of the shaft seal act as operating resistance against the rotational torque of the motor, increasing the driving force, resulting in the disadvantage of increasing the size of the stamping motor. there were. Furthermore, since the opening area of the fluid flow path is not proportionally controlled by the amount of electrical signal input to the motor and the valve body, there is a drawback that the flow rate of the control fluid cannot be proportionally controlled by the electrical input signal. Ta.

[Problems and effects to be solved by the invention] In order to solve the above object, the invention includes a stator wound with an armature coil that receives electrical input, and a stator that is surrounded by the stator and is rotatably disposed. In an electric valve in which a valve body driven and controlled by an electric motor having a rotor controls opening and closing of a fluid flow path, a hollow cylindrical compartment made of a non-magnetic material is disposed between the stator and the rotor, and the compartment The hollow cylindrical compartment is made of non-magnetic material, so it is located between the stator and rotor and does not affect the magnetic flux of the electric motor. Since it is constructed as a part of the sealing member, a shaft seal is unnecessary and pressure leakage can be completely prevented.

“Example j” An example of the present invention will be explained with reference to FIGS. 1 to 4.
The valve body 4 is movable up and down in response to the valve seat 12 disposed in the fluid flow path 11 passing through the inside of the valve body 10, and the flange 13 is guided by the groove 14 of the valve body to prevent rotation. will be placed. A hollow cylindrical body 5 made of a non-magnetic material is fixed to the upper part of the valve body via a pankin 15 at the bottom, and a rotor 3 made of a magnetic material is rotatably mounted inside the partition body. It is arranged such that vertical movement is restricted by a gasket 15.

The shaft of the rotor 3 and the valve body 4 are screwed together, and the rotation of the rotor causes the valve body 4 to move up and down. A stator 2, which is wound with an armature coil 1 that receives electrical input, is disposed around the outer periphery of the partition, and together with the rotor constitutes a known stamping motor. On the other hand, the tip of the valve body 4 has a quadratic curved surface, and is designed in such a shape that the opening area between the valve body and the valve seat changes proportionally as the valve body moves in the axial direction. The method for obtaining this quadratic surface shape is as follows (for example, JP-A-55-97
513'+) is known,
Detailed description will be omitted.

The present invention does not require a valve body shape having a quadratic curved surface;
As shown in FIG. 4, the present invention can be applied to a proportional valve configured such that the fluid flow passage opening area of the valve changes proportionally to the rotation angle of the rotor. Therefore, in addition to gate valves, valve shapes include spool valves, butterfly valves (for example, JP-A-58-2
1407L', :2), swing valves, disc valves, etc. Further, if the electric motor is a pulse motor including a barrier pull/roughtance type, a permanent magnet type, and a high print type, it can be easily controlled digitally or by a computer.

Furthermore, the rotor and stator do not need to be pulse motors as long as they are synchronous motors in which the amount of rotation of the rotor is proportional to the amount of electric human power signal.

To explain the operation of the embodiment, a magnetic flux is generated in response to the amount of electric signal input to the armature coil 1, and induces rotational movement of the rotor 3 through the partitions 5 made of non-magnetic material. As the rotor rotates, the valve body 4 screwed onto the rotor is restricted from rotating and moves downward.

The amount of electrical signal input to the armature coil 1 is proportional to the amount of rotation of the rotor, and the change in the flow path opening area between the valve body 4 and the valve seat 12 with respect to the amount of rotation of the rotor is shown in FIG. Since it changes proportionally, the flow path opening area of the valve is proportional to the amount of electrical signal. Then, the fluid flow rate Q passing through the throttle orifice between the valve body and the valve seat is A, Q = CArK. Since the shape of the diaphragm does not change much through opening and closing, the flow coefficient C is considered to be almost constant. From the set, if the pressure difference ΔP is constant, the flow rate Q is proportional to the opening area Q. controlled by

``Effect of the invention J: The uninvented object is that the magnetic flux action between the rotor and stator is not affected by configuring the partition body in a hollow cylindrical shape made of non-magnetic material, and the cylindrical shape can be adjusted in accordance with the rotational movement of the rotor. By using this, the gap between the rotor and stator can be minimized, and the magnetic effect can be utilized to the fullest.Also, by using the partition as part of the pressure-resistant member of the box, a shaft seal is no longer necessary. External leakage (pressure leakage) can be reduced to zero.Furthermore, by using a synchronous motor or a pulse motor as the electric motor, and configuring the valve body shape to change proportionally to the valve opening. Application to proportional control valves is possible.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the electric valve of the present invention, FIG.
3+4 is a sectional view taken along line [1-III] in FIG. 1, and FIG. 4 is an explanatory diagram showing the relationship between the coater rotation angle and the valve opening area of the motor-operated valve of the present invention. 1...Armature coil 2, 6-stator 3Φφ-rotor 4...valve body 5...dividing body

Claims (3)

[Claims] (1) Comprising a stator wound with an armature coil that receives electrical input, a rotor surrounded by the stator and rotatably arranged, and a valve body whose drive is controlled by the rotation of the rotor. An electrically operated valve that controls opening and closing of a fluid flow path, in which a hollow cylindrical partition made of a non-magnetic material is arranged between a stator and a rotor, and the partition is used as a part of a pressure-resistant member. (2) A stator having an armature coil wound around which receives electrical input, a rotor surrounded by the stator and rotatably arranged, and a valve body whose drive is controlled by the rotation of the rotor. In an electric valve that controls the opening and closing of a fluid flow path, a hollow cylindrical compartment made of a non-magnetic material is arranged between the stator and the rotor, and the compartment is used as a part of the pressure-resistant member and controls the amount of rotation of the rotor. On the other hand, an electric valve is a motor-operated valve that proportionally changes the opening area of a fluid flow path that is controlled to open and close by a valve body. (3) A stator having an armature coil wound around which receives electrical input, a rotor surrounded by the stator and rotatably arranged, and a valve body whose drive is controlled by the rotation of the rotor. In an electric valve that controls the opening and closing of a fluid flow path, a hollow cylindrical compartment made of a non-magnetic material is arranged between the stator and the rotor, and the compartment is used as a part of the pressure-resistant member and input to the armature coil. An electric valve that changes the amount of rotation of the rotor proportionally to the amount of electric signal received.