JPH0875025A - Electric operated valve - Google Patents

Abstract

PURPOSE: To prevent damage by heat in using high temperature fluid, and prevent electric defective by condensation or moisture in an electric operation machine in using cold water. CONSTITUTION: A resin spacer 5 is held between an electric operation machine 1 and a valve main body 3, two pins 7 are engaged in a hollow cylinder resin joint 6, and the outer circumference of the resin joint 6 is covered with a heat shrinkage tube 50. One pin 7 is connected to a split groove part of an output shaft 2 of the electric operation machine 1, and the other pin 7 is connected to an output shaft of an operation shaft of the valve main body 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The motor-operated valve of the present invention is particularly used for controlling high temperature fluids such as steam and high temperature water.

[0002]

2. Description of the Related Art When a conventional motor-operated valve is used in a pipe through which a high-temperature fluid flows, fluid heat is transferred to the operation shaft of the valve body and further to the output shaft of the motor-operated device, so that the electrical components inside the motor-operated device,
For example, there has been a drawback that electric motor condensers, switches, rectifiers, substrates, resistors, etc. are damaged or damaged by heat.
In addition, the oil content of the oil-impregnated sintered bearing inside the reduction gear and the oil content of the reduction gear train are outflowed and deteriorated by heat, resulting in poor lubrication.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and an object of the present invention is to provide heat to an electric actuator even when an electric valve is used with a high temperature fluid. It is to prevent transmission and prevent damage due to heat. Further, when the present invention is used for cold water, the transmission of cold heat is also prevented, so that the occurrence of dew condensation due to cold water is eliminated, and it is possible to prevent the electrical failure due to dew condensation of the electric operating machine and humidity.

[0004]

DISCLOSURE OF THE INVENTION The present invention relates to an electric valve in which an output shaft 2 of an electric operating device 1 having an electric motor and a speed reducer is connected to an operating shaft 4 of a valve main body 3 in the electric operating device and the valve main body. A resin spacer 5 is sandwiched and arranged in the middle of, and two pins 7 are fitted into a hollow cylindrical resin joint 6,
The outer circumference of the cylindrical resin joint is covered with a heat-shrinkable tube, one of the pins is fitted and connected to the split groove of the output shaft of the electric operating machine, and the other pin is fitted and connected to the split groove of the operating shaft of the valve body. ing. Also, the two pins are fitted and arranged in the orthogonal direction on the cylindrical cross section of the joint. Furthermore, a yoke is sandwiched between the resin spacer and the valve body,
The lower end of the stem rotatably arranged in the hollow portion of the yoke is connected to the operation shaft, and the split groove portion of the upper end of the stem is adaptively connected to the pin of the resin joint.

[0005]

The heat transfer of the fluid flowing through the valve body is primarily prevented by ensuring a certain length between the yoke and the stem. Heat transfer from the upper end of the yoke to the electric operating device 1 is prevented by the resin spacer. Further, heat transfer from the upper end of the stem to the output shaft is prevented by the resin joint 6. Since the two pins are fitted and arranged in the direction orthogonal to each other on the cylindrical cross section of the joint, when transmitting the turning torque from the output shaft to the operating shaft, the force transmission in the circumferential direction is efficiently executed, and the cylindrical radiation is emitted. Dispersion of force in the direction can be prevented. The outer diameters of the output shaft and the operation shaft are fitted in the hollow portion of the resin joint, and the concentricity of the connection is secured. Due to the heat shrinkage of the outer circumference of the cylindrical resin joint, the two pins 7
Is prevented from coming off in the outer diameter direction. In particular, when used with a high temperature fluid, the tube contracts due to heat, and the tube is prevented from coming off.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 8. The valve body 3 is an example of a ball valve, and a ball-shaped valve body arranged in a fluid passage is rotated by 90 degrees. The operation shaft 4 is connected to the valve body so that the valve body can be driven and operated by an external force. A yoke 8 is fixed to the upper end of the valve body 3 with two bolts,
A stem 9 is rotatably arranged in the hollow portion of the yoke. The upper end and the lower end of the stem 9 are each machined into a split groove shape, and the split groove portion at the lower end of the stem is adaptively connected to the width across flats at the upper end of the operating shaft. Two resin spacers 5 are laminated on the upper end of the yoke 8 and sandwiched and fixed between the electric operating machine 1 and the yoke 8 by two bolts. A resin joint 6 is arranged in the hollow portion of the resin spacer. The resin joint has a hollow cylindrical shape, and two pins 7 are fitted in the joint cylindrical section in a direction orthogonal to each other and in an axial direction at a distance. After the two pins 7 are fitted in the resin joint, the outer periphery of the resin joint is covered with the heat-shrinkable tube 50 to prevent the pins from coming off in the outer diameter direction. The heat-shrinkable tube is a heat-resistant resin tube made of silicon rubber, polyolefin, or the like, and is a tube that shrinks in the radial direction in a short period of time by heating. The lower end of the output shaft 2 of the electric operating machine is cutter-processed into a split groove shape, and one of the pins 7 is fitted and connected thereto. The other pin 7 is
The stem 9 is fitted and connected to the split groove portion at the upper end of the stem 9. still,
An electric motor and a speed reducer are built in the electric operating device 1, which receives an electric input and outputs the rotational force of the output shaft 2. Therefore, the turning force of the output shaft 2 is transmitted to the upper pin of the resin joint, is transmitted from the lower pin of the resin joint to the stem 9 as the turning force, and further acts as a driving force to the operation shaft 4. When a high-temperature fluid is used for the valve body 3, the length of the yoke 8 and the stem 9 in the height direction has a heat dissipation effect of heat transfer. The heat transfer to the upper end of the yoke 8 is insulated by the resin spacer 5. The heat transfer at the upper end of the stem 9 is insulated by the resin joint 6. Since the lower end of the output shaft 2 fitted in the hollow portion of the resin joint and the upper end of the stem 9 are not in contact with each other, heat is not transferred. Further, since the two pins 7 are separated from each other in the axial direction, they are not in contact with each other and heat transfer is prevented. Therefore, the high-temperature heat of the valve body is primarily thermally insulated by the yoke 8 and the stem 9, and secondarily thermally insulated by the resin spacer 5 and the resin joint 6 to completely prevent the heat transfer to the electric operating device. .

[0007]

According to the present invention, when used in a high temperature fluid or a low temperature fluid, the fluid heat of the valve body is completely insulated without being transferred to the electric operating machine, so that failure and damage of the electric operating machine are eliminated. To be done. In particular, the present invention combines the function of a driving force transmitting member between the output shaft and the operating shaft and the function of a heat insulating material by fitting two pins into a hollow cylindrical resin joint. Yes, it maximizes the heat insulation effect at the center of the shaft where heat transfer is the largest. Further, the yoke and the stem are arranged as the primary heat insulation, and the resin spacer and the resin joint are arranged as the secondary heat insulation to enhance the heat insulation effect. In particular, two metal pins were fitted in the resin joint to enhance the heat insulation effect of the joint portion. Further, the effect of preventing the two pins from coming off in the outer diameter direction is realized by the heat-shrinkable tube, and the effect when used with a high temperature fluid is great. That is, even if the pin hole of the resin joint expands due to high heat,
The heat shrink tube can prevent the pin from coming off.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of an electric valve of the present invention.

FIG. 2 is a front view of the stem of FIG.

FIG. 3 is a right side view of the stem shown in FIG.

4 is a top view of the stem of FIG.

5 is a bottom view of the stem of FIG. 1. FIG.

6 is a front sectional view of the resin joint of FIG.

FIG. 7 is a right side sectional view of the resin joint of FIG.

FIG. 8 is a top view of the resin joint of FIG.

[Explanation of symbols]

 1 Electric operating device 2 Output shaft 3 Valve body 4 Operating shaft 5 Resin spacer 6 Resin joint 7 Pin 8 Yoke 9 Stem 50 Heat shrink tube

Claims (3)

[Claims] 1. An electric operating device 1 including an electric motor and a speed reducer.
In the electrically operated valve in which the output shaft 2 of the above is connected to the operation shaft 4 of the valve body 3, the resin spacer 5 is sandwiched and arranged between the electrically operated machine and the valve body, and the hollow cylindrical resin joint 6 has two The pin 7 is fitted, the outer circumference of the cylindrical resin joint is covered with a heat shrink tube, one of the pins is fitted and connected to the split groove portion of the output shaft of the electric operating machine, and the other pin is connected to the operating shaft of the valve body. A motor-operated valve characterized by being connected to the split groove part of. 2. The motor-operated valve according to claim 1, wherein the two pins 7 are fitted and arranged in a direction orthogonal to each other on a joint cylindrical cross section. 3. The electric motor according to claim 1, wherein the operating shaft 4 of the valve body is connected to a stem 9 rotatably arranged in a hollow portion of a yoke 8 sandwiched between a resin spacer 5 and the valve body. valve.