JPH0218865Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an electromagnetic flow control valve.

As shown in FIG. 1, in the electromagnetic flow control valve, a resin bobbin 2 made of a non-magnetic material is fitted and fixed around a center core 1 made of a magnetic material.
A solenoid coil 3 connected to a power source is wound on the top. A pair of magnetic outer circumferential yokes 4 and 5 are fixed to both sides of the center core 1, and the motor section 6 is constituted by the yokes 4 and 5, the center core 1, and the coil 3. A permanent magnet 7 is arranged in the magnetic circuit of the motor section 6.

The motor section 6 is coupled to the valve body 8 via a pair of yokes 4 and 5. A resin holder 9 is integrally molded onto a permanent magnet 7 within a valve body 8, and a rotary valve 10 is placed within the resin holder 9. A rotary valve 10 is slidably fitted onto a bearing member 11 held within a valve body 8.

As shown in FIG. 2, input/output ports 12 and 13 are formed in the valve body 8, and both ports 1
2 and 13 are electrically connected through a hole 14 of the bearing member 11 and a through hole 15 of the rotary valve 10. That is, when an electric signal is applied to the solenoid coil 3, the motor section 6 creates a magnetic circuit and generates a magnetic field. This magnetic field causes the permanent magnet 7 to generate rotational torque, rotate the rotary valve 10, and control the opening and closing of the through hole 15 of the rotary valve 10 with respect to the ports 12 and 13. Incidentally, reference numeral 16 denotes a spring that always biases the rotary valve 10 in a direction opposite to the rotational torque direction produced by the magnet 7.

The through hole 15 drilled in the conventional rotary valve 10 is a perfect circle, and it is necessary to select the diameter of the rotary valve 10 and the diameter of the bearing member 11 according to this perfect circle. The valve body 8 is made larger due to the larger diameter.

This idea was intended to solve the above-mentioned problems of the prior art and provide a small electromagnetic flow control valve.Basically, the through hole of the rotary valve is made elongated in the axial direction, and the rotary valve is Use technical means to reduce the diameter of the valve. Adopting a rotary valve with a small diameter reduces the sliding resistance between the bearing member and the rotary valve, and has the effect of reducing the load on the motor section. Furthermore, the use of elongated holes makes it possible to reduce the rotation angle for opening and closing operations, thereby suppressing valve leakage.Moreover, the opening and closing control of the valve can be carried out in parts of the motor section with excellent characteristics, that is, parts with large torque. This provides the advantage that valve operation can be performed reliably and with a small motor.

According to this invention, the invention includes a permanent magnet that generates rotational torque by an external magnetic field, a rotary valve that rotates together with the magnet due to the rotational torque of the permanent magnet, and a bearing member and a valve body around the rotary valve. , an electromagnetic flow control valve in which opening and closing of an input/output port provided in the valve body is controlled by a through hole formed in the rotary valve, wherein the through hole of the rotary valve is an elongated hole that is long in the axial direction; There is provided an electromagnetic flow control valve characterized in that the hole has a surface that converges from a perfect circle of the input/output port of the valve body to a long hole of the valve body.

An embodiment of this invention will be described with reference to the attached FIG. 1 and FIGS. 3-6.

A through hole formed in the rotary valve 10 is made into a long hole 17 that is long in the axial direction of the rotary valve 10. The long axis of the through hole or elongated hole 17 is approximately equal to the diameter of the passage 18 of the valve body 8, and the short axis thereof is of a size sufficient to ensure the required flow rate.
The hole drilled in the bearing member 11 has a surface 19 that converges from the diameter of the passage 18 of the valve body 8 into the elongated hole 17 of the rotary valve 10. Such a long hole 17
By adopting this, the diameter of the rotary valve 10 can be reduced, and the effective rotation angle for opening and closing the elongated hole 17 can be reduced. Thus, as shown in FIG. 6, the valve can be opened and closed in the high torque portion.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an electromagnetic flow control valve, Fig. 2 is a sectional view showing the through hole of a conventional rotary valve, and Fig. 3 is a sectional view showing an example of this invention as seen from the direction of the arrow in Fig. 1. , Fig. 4 is a sectional view taken from the direction of the arrow in Fig. 3, Fig. 5 is a sectional view taken from the direction of the arrow in Fig. 3, and Fig. 6 shows the rotation angle of the rotary valve and the rotational torque of the permanent magnet. It is a graph diagram. In the diagram: 7...Permanent magnet, 8...Valve body,
10... Rotary valve, 11... Bearing member, 1
2, 13... Port, 17... Elongated hole, 19... Opening surface of bearing member.

Claims (1)

[Scope of utility model registration request] It has a permanent magnet that generates rotational torque by an external magnetic field, a rotary valve that rotates together with the magnet due to the rotational torque of the permanent magnet, and a bearing member and a valve body around the rotary valve,
In an electromagnetic flow control valve in which opening and closing of an input/output port provided in the valve body is controlled by a through hole formed in the rotary valve, the through hole of the rotary valve is an elongated hole that is long in the axial direction;
The long axis of the elongated hole is approximately equal to the diameter of the passage from the input/output port, and the hole of the bearing member has a surface that converges from the perfect circle of the input/output port of the valve body to the elongated hole of the valve body. Features an electromagnetic flow control valve.