JPS61278674A - Motor operated - Google Patents

Abstract

PURPOSE:To simplify configuration by making a section piece with a hollow cylindrical shape of a nonmagnetic material. CONSTITUTION:A hollow cylindrical section piece 3 of a nonmagnetic material is arranged between a stator 1 and a rotor 2, with the section piece 3 as a valve pressure bearing member. A valve hole 5 is bored through a periphery wall of a cylindrical valve body 4 driven by the rotor 2. Further, valve opening areas of the valve hole 5 and a fluid passage 6 are changed in proportion to the rotation angle of the rotor 2. With this constitution, a motor operated valve of simple configuration without external leakage of controlled fluid can be obtained.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to an electric valve that opens and closes a fluid flow path by a valve body driven by an electric motor that rotates in response to electrical input, and particularly relates to a control valve. The present invention relates to an electric valve that proportionally controls fluid flow rate without external leakage of fluid. More specifically, it can be used in combustion equipment, gas flow control valves used in water heaters, water flow control valves, process fluid control valves in plants, and the like.

"Prior Art" Conventional electric valves generally use a stepping motor to drive and control a valve shaft that controls the opening and closing of a fluid flow path, as disclosed in, for example, Japanese Patent Laid-Open No. 58-178117. . According to this, the valve shaft is directly connected to the drive shaft of the stepping motor, and a seal ring as a shaft seal is arranged on the valve shaft to prevent external leakage of control fluid (pressure leakage). However, there is a risk that the control fluid may leak to the outside from this shaft seal due to wear during use, and there is a drawback that it cannot be used to control flammable gases (propane gas, city gas) or toxic gases. Furthermore, in order to improve this sealing performance, increasing the shim width of the shaft seal can prevent leakage to the outside, but the sliding resistance of the shaft seal becomes operational resistance against the rotational torque of the motor.

There was a drawback that it was necessary to increase the size of the motor in order to increase the driving force. Therefore, the fluid flow rate cannot be proportionally controlled by the amount of electric signal input to the motor, and it is difficult to control the flow rate of the control fluid using a microcomputer.

"Problems to be Solved by the Invention" The present invention provides an electrically operated valve that has no external leakage of the control fluid, can proportionally control the flow rate of the control fluid under control by a microcomputer, and has a simple structure and is inexpensive. It's about doing.

"Means for Solving the Problems" In order to achieve the above object, the electric valve of the present 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 arranged. In an electric motor-operated valve comprising a rotor and a valve body whose drive is controlled by rotation of the rotor, a hollow cylindrical partition made of a non-magnetic material is disposed between the stator and the rotor. is used as a pressure-resistant member of the valve, and a valve hole is formed on the circumferential side of a cylindrical valve body that is rotationally driven by a rotor, and the valve opening area of the valve hole and the fluid flow path, and the rotation angle of the rotor. , is changed proportionally.

"Function" Since the hollow cylindrical partition is made of non-magnetic material, it does not affect the magnetic flux action of the electric motor even if it is located between the stator and rotor, and also forms part of the pressure-resistant member of the valve. No shaft seal is required, so there is no risk of external leakage, and since the rotor and valve body are directly connected, and a valve hole is provided on the circumferential side of the cylindrical valve body, there is no resistance due to deceleration of gears, etc., and the configuration is simple. It will be cheaper. Further, the valve opening area and the rotation angle of the rotor can be easily changed proportionally only by setting the shapes of the fluid flow path and the valve hole.

"Embodiment" An embodiment of the electric valve according to the present invention will be described below with reference to FIGS. 1 to 5.

A fluid flow path 6 is formed passing through the inside of the valve body 10 from the inlet 11 to the outlet 12, and the cylindrical valve body 4 is rotatably fitted into the inside of the valve body 10. The valve body 4 is formed into a hollow cylindrical shape, and a valve hole 5 having a square opening cross-section is bored in its circumferential side, and the opening cross-section of the fluid flow path 6 on the outlet side is also square. Ru. A rotor 2 is connected to the upper part of the valve body 4, and the rotor 2 is rotatably arranged together with the valve body. The partition body 3 is placed and 0
- On the outer periphery of the partition 3, which is fixed to the valve body 10 via a ring 14 and constitutes part of the pressure-resistant member of the valve, a stator 1 with poles 15 is arranged, the poles receiving electrical input; An electric machine coil 18 is wound, and the stator and rotor constitute a known stepping motor. In the present invention, as shown in FIG.
Since the opening area S of the rotor and the rotation angle of the rotor are configured to change proportionally, the fluid flow rate can be controlled proportionally in response to the electrical input of the motor. In other words, the fluid flow rate θ passing through the throttle valve orifice between the valve hole and the fluid flow path is expressed by the formula % ΔP-...Differential pressure before and after the orifice A-...Opening area of the orifice Cφ...Flow coefficient Since the shape of the throttle valve does not change much through opening and closing, the flow coefficient C is considered to be almost constant, so Δ
If P is constant, the flow rate θ is controlled in proportion to the opening area θ. In the embodiment, the valve hole 5 and the fluid flow path 6 are both square shaped, and the rotor rotation angle and the valve opening area 5 change proportionally, so the valve opening area 5 changes proportionally to the amount of electrical input from the stepping motor. Fluid flow rate can be controlled proportionally and directly controlled by a microcomputer.

A second embodiment of the present invention will be described with reference to FIGS. 6 and 7.

The valve body 4 is formed into a cylindrical shape with a part of its circumferential surface being flat, and the cross-sectional shape of the opening of the fluid flow path 6 on the side of the outlet 12 is formed into a square shape, so that the rotation angle of the rotor and
The valve hole and the valve opening area S of the fluid flow path change proportionally, and proportional control of the control fluid can be realized as in the first embodiment.

A third embodiment of the present invention will be described with reference to FIGS. 8 to 13. The fluid flow path 6 on the outlet side of the valve body is formed to have a circular opening cross-section, and the valve body 4 is formed into a hollow cylindrical shape so that its periphery is A valve hole 5 is bored in the side surface, and the opening area S of the valve hole 5 and the fluid flow path is
The shape of the valve hole 5 is set so that the angle of rotation of the rotor 2 and the angle of rotation of the rotor 2 change proportionally. The shape of the valve hole 5 can be set sequentially from the opening area in accordance with the rotation angle of the rotor.
It can be easily obtained by using the D system.

"Effects of the Invention" The present invention uses a hollow cylindrical shape for the partition made of non-magnetic material, so that the magnetic flux action between the rotor and the stator is not affected, and the cylindrical shape is adopted in accordance with the rotation of the rotor. The gap between the rotor and stator can be minimized and the magnetic flux effect can be maximized. By making the partition a part of the pressure-resistant member of the valve, there is no need for a shaft seal, and external leakage of fluid can be reduced to zero. In addition, by connecting the rotor and the cylindrical valve body, the structure of the valve is simplified and miniaturized, and a valve hole is formed on the circumferential side of the cylindrical valve body to improve the valve opening area S and the rotor rotation angle. Since the fluid flow rate is changed proportionally, the fluid flow rate can be controlled proportionally in response to the amount of electrical input signal to the motor.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view showing one embodiment of the electric valve according to the present invention, Fig. 2 is a cross-sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a cross-sectional view of the
4 is an external view of the valve body in FIG. 1, FIG. 5 is a diagram showing the relationship between the valve opening area S and rotor rotation angle in FIG. 1, and FIG. The figure is an external view of a valve body showing a second embodiment of the present invention, FIG. 7 is a top view of the valve body shown in FIG. 6, and FIG. ,
9 is an external view of the valve body shown in FIG. 8, and FIGS. 10 to 13 are external views showing the relationship between the valve opening area S and the rotor rotation angle in FIG. 8. 106. Stator, ? 11. Rotor, 3141 compartment body, 419. Valve body, 500. Valve hole, 600. fluid flow path. %ztB 'pt t@san5''日itz藺愼t3153

Claims (1)

[Claims] 1. A stator wound with an armature coil that receives electrical input, a rotor surrounded by the stator and rotatably arranged, and a valve whose drive is controlled by the rotation of the rotor. In the electric valve, a hollow cylindrical partition made of a non-magnetic material is arranged between the stator and the rotor, the partition is used as a pressure-resistant member of the valve, and the partition is rotationally driven by the rotor. An electrically operated valve in which a valve hole is formed in the circumferential side of a cylindrical valve body, and the valve opening area of the valve hole, the fluid flow path, and the rotation angle of the rotor are changed proportionally. 2. It includes 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. In the electric valve, a hollow cylindrical partition made of a non-magnetic material is arranged between the stator and the rotor, and the partition is used as a pressure-resistant member of the valve, and the hollow cylindrical valve is rotationally driven by the rotor. 2. The motor-operated valve according to claim 1, wherein a valve hole having a rectangular opening cross-sectional shape is bored in the circumferential side of the body, and the opening cross-sectional shape of the fluid flow path is square. 3. 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. In the electric valve, a hollow cylindrical partition made of a non-magnetic material is arranged between the stator and the rotor, and the partition is used as a pressure-resistant member of the valve, and the cylindrical valve body is rotationally driven by the rotor. 2. The motor-operated valve according to claim 1, wherein the circumferential side surface of the valve hole is partially planar and a valve hole is formed therein, and the cross-sectional shape of the opening of the fluid flow path is square. 4. 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. In the electric valve, a hollow cylindrical partition made of a non-magnetic material is arranged between the stator and the rotor, and the partition is used as a pressure-resistant member of the valve, and the hollow cylindrical valve is rotationally driven by the rotor. A valve hole is formed on the circumferential side of the body, and the cross-sectional shape of the opening of the fluid flow path is circular, and the shape of the valve hole is set so that the opening area with the valve hole and the rotation angle of the rotor change proportionally. The electric valve according to claim 1.