JPH0640542U - Motorized valve - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a motor-operated valve which does not cause clogging of foreign matters and impurities, is easy to manufacture, and can be manufactured at low cost. [Structure] A valve seat 2 and a valve body 3 which are arranged so as to face each other so that the minimum flow passage area in the flow passage pipe 1 is changed by changing the gap between the two, and the outside of the flow passage pipe 1 A rotor 22 that is rotationally driven by the electromagnetic coil 21 that is arranged.
And motion converting means 13, 13a, 15b for converting the rotational motion of the rotor 22 into the advancing / retreating motion of the valve body 3 for changing the minimum flow passage area, are arranged in the flow passage pipe 1, Flow path 1 for passing the fluid in the flow path tube 1
4c, 15c and 22a are formed on the rotor 22 and the motion converting means 13, 13a and 15b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric valve that is driven to open and close by rotation of a motor.

[0002]

[Prior art]

 As shown in FIG. 2, a conventional motor-operated valve of this type generally connects two flow passage pipes 53 and 54 at a right angle to a valve chamber 52 in which a valve body 51 is arranged. A motor mounting cylinder 56 to which a step motor 55 for driving 51 is mounted is fixed to the valve chamber.

The valve shaft 57 fixed to the rotor 55 a of the step motor 55 is screwed into the valve chamber 52. Therefore, when the valve shaft 57 is rotationally driven by the step motor 55, the valve shaft 57 advances and retreats in the axial direction, whereby the valve body 51 moves and the minimum flow passage area changes, and the flow rate of the fluid flowing in the flow passage pipes 53 and 54 changes. Can be adjusted.

[0004]

[Problems to be solved by the device]

 In the motor-operated valve configured as described above, the fluid passes from the valve chamber 52 to the rotor 55a side through the threaded portion of the valve shaft 57. However, if foreign matter or impurities contained in the fluid (for example, water, lithium bromide, etc.) enter the motor mounting cylinder 56, they adhere to the rotating part, etc., and gradually accumulate and become clogged, causing the rotor 55a to rotate. An interfering phenomenon occurs.

In addition, in the configuration of the conventional motor-operated valve as described above, it is necessary to weld the two flow path pipes 53, 54 and the motor mounting cylinder 56 and the like to the valve chamber 52, which is troublesome to manufacture. However, there is a drawback that the cost is high.

Therefore, an object of the present invention is to provide a motor-operated valve which is free from clogging with foreign matters and impurities, is easy to manufacture, and can be manufactured at low cost.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the motor-operated valve of the present invention has a valve seat and a valve body which are arranged opposite to each other so that the minimum flow passage area in the flow passage pipe is changed by changing the gap between them. And a rotor that is rotationally driven by an electromagnetic coil arranged outside the flow path tube, and a motion conversion that converts the rotational motion of the rotor into forward / backward motion of the valve body for changing the minimum flow path area. Means are disposed in the flow passage pipe, and a flow passage for allowing the fluid in the flow passage pipe to pass is formed in the rotor and the motion converting means.

The flow passages formed in the rotor and the motion converting means each have an area larger than the maximum area of the flow passage formed by the gap between the valve seat and the valve body. Is good.

Further, the valve seat may be formed in a tapered hole shape, and the valve body may be formed in a spherical shape.

[0010]

[Action]

 Since not only the valve seat and the valve body but also the rotor and the motion converting means are arranged in the flow passage pipe, the flow passage pipe can be formed by one flow passage pipe having no connecting portion.

In the rotor and the motion converting means, the fluid passes through the flow passages formed in the respective parts, and the flow passage area of the flow passage is defined by the gap between the valve seat and the valve body. By making the area larger than the maximum area that can be taken, the fluid passes through the flow path of each part without any obstruction to the flow.

By forming the valve element into a spherical shape, stable and accurate flow rate control without biting into the valve seat is performed, and by forming the valve seat into a tapered hole, it is possible to respond to the advance / retreat of the valve element. It is possible to perform fine flow rate control, and it is also possible to easily change the flow rate control characteristics by changing the taper angle in the middle.

[0013]

【Example】

 An embodiment will be described with reference to the drawings. In FIG. 1, reference numeral 1 is a flow pipe formed by a single straight pipe having no connecting portion, and is used by flowing various liquids inside.

In the flow passage pipe 1, a valve seat 2 having a flow passage portion on the axis of the flow passage pipe 1 and formed in a tapered hole is fixedly provided. A spherical ball valve 3 is arranged so as to face the valve seat 2 from the side of the valve seat 2 having a large opening. As shown in FIG. 1, the ball valve 3 contacts the tapered surface of the valve seat 2.

The member forming the valve seat 2 is fixed to the inner peripheral surface of the flow path pipe 1 at the outer circumference, and the fluid in the flow path pipe 1 is a gap between the valve seat 2 and the ball valve 3. The flow path formed by the flow path at a flow rate corresponding to the minimum flow path area in the pipe 1.

The ball valve 3 is welded to the tip of a valve support 11 formed in an umbrella shape, and the valve support 11 is always urged by the compression coil spring 12 toward the direction where the ball valve 3 is separated from the valve seat 2. Has been done.

Reference numerals 21 and 22 denote an electromagnetic coil and a rotor that constitute the step motor 20, and the plurality of electromagnetic coils 21 are arranged outside the flow channel tube 1 so as to surround the flow channel tube 1.

A magnet 23 is attached to the rotor 22 along the inner surface of the flow path pipe 1, and a rotary shaft 13 whose tip comes into contact with the valve support 11 from the opposite side of the ball valve 3 to the center shaft portion, It is fixed so as to rotate integrally with the rotor 22.

In addition, the rotor 22 has a flow passage hole 22 a having a total area larger than the flow passage area when the ball valve 3 is farthest from the valve seat 2 and the flow passage area therebetween is maximized. It is provided by penetrating in the axial direction.

Inside the flow path pipe 1, a pair of bearing members 14 and 15 for supporting the rotary shaft 13 on both sides of the rotor 22 is provided. One of the bearing members 14 is a disk-shaped frame plate 14a fixed to the inner peripheral surface of the flow path pipe 1, and a bearing metal 14b fixed to the center of the frame plate 14a and rotatably fitted with the rotary shaft 13. It is formed by and.

A disc-shaped frame plate 15 a that constitutes the other bearing member 15 has an outer peripheral portion fixed to the inner peripheral surface of the flow path pipe 1, and a male portion formed on the rotary shaft 13 at the center portion thereof. A female screw 15b is formed which is screwed into the screw 13a.

In both of these frame plates 14 a, 15 a, the flow passage holes 14 c, 1 having a total area larger than the flow passage area when the flow passage area between the ball valve 3 and the valve seat 2 is maximized. 5 c are provided so as to penetrate each in the pipe axis direction.

Therefore, when the rotary shaft 13 is rotationally driven by the step motor 20, the rotary shaft 13 moves forward and backward in the axial direction, and accordingly, the ball valve 3 moves in the pipe axial direction to move between the valve seat 2 and the valve seat 2. The minimum flow path area formed in the flow path changes, and the flow rate of the liquid flowing in the flow path tube 1 is controlled.

In this way, the fluid in the flow passage pipe 1 smoothly flows in the straight flow passage pipe 1 having no connecting portion.

[0025]

[Effect of device]

 According to the motor-operated valve of the present invention, by arranging the rotor of the motor inside the flow passage tube itself, the fluid inside flows smoothly in one flow passage pipe, so that foreign matter and impurities in the fluid accumulate. It can operate smoothly and accurately for a long period of time without causing the phenomenon of clogging.

Further, since it is not necessary to weld the flow path pipe, the manufacturing is simple and can be manufactured at low cost.

[Brief description of drawings]

FIG. 1 is a side sectional view of a motor-operated valve according to an embodiment.

FIG. 2 is a side sectional view of a conventional motor-operated valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 flow path pipe 2 valve seat 3 ball valve (valve body) 13 rotating shaft 13a male screw 14c flow path hole 15b female screw 15c flow path hole 20 step motor 21 electromagnetic coil 22 rotor 22a flow path hole (flow path)

Claims (3)

[Scope of utility model registration request] 1. A valve seat and a valve body, which are arranged so as to face each other so that the minimum flow passage area in the flow passage pipe is changed by changing the gap between them, and the valve seat and the valve body are arranged outside the flow passage pipe. A rotor that is rotationally driven by an electromagnetic coil, and a motion converting unit that converts rotational motion of the rotor into advancing / retreating motion of the valve body for changing the minimum flow passage area are arranged in the flow passage pipe, and A motor-operated valve, characterized in that a flow passage for passing a fluid in a flow passage pipe is formed in the rotor and the motion converting means. 2. The flow paths formed in the rotor and the motion converting means each have an area larger than a maximum area that can be taken by a flow path area formed by a gap between the valve seat and the valve body. The motor-operated valve according to claim 1. 3. The electric valve according to claim 1, wherein the valve seat is formed in a tapered hole shape, and the valve body is formed in a spherical shape.