JPS59133882A - Motor operated valve - Google Patents

Abstract

PURPOSE:To prevent the penetration of rainwater into the inside of a case as well as to keep off the long duration of dew condensation, by installing a drain hole in the bottommost part of a drivng part case situated at the more lower part than an input power source, and an air hole between a drain hole and the input power source plus a drain hole cover in position outside the drain hole, respectively. CONSTITUTION:A fixed plate 23 is installed in a body 21, and a driving part case 27 is locked to the other end via a rubber drain hole cover 26. Electrical control parts such as a motor 29, a microswitch 34, etc., are housed inside the body. At the side of the case 27, wiring for a cord 36 as an input power source is arranged there and a drain hole 37 is made up in the bottommost part of the case 27. On the other hand, at the side of the case 27 between the drain hole 37 and the input power source, an air hole 38 is installed. Even in the state of rainfall, since the drain hole cover 26, is provided there splash of rainwater do not enter inside the case 27. In addition, the drain hole cover 26 is being cut aslant so that even when the splash of rainwater sticks to the tip end, a watery film will not be formed there at all.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention includes a motor, a drive case incorporating electric control parts for controlling the operation of the motor, and a drive case that rotates a υ axis by driving the motor. This invention relates to an electric valve consisting of a valve body and a valve body that switches a flow path.

Conventional Structure and its Problems Conventionally, this type of electric valve has a structure as shown in FIG.

In FIG. 1, 1 is a valve body, and a ball valve body 4 sealed with sealing materials 2 and 3 is housed inside the valve body. A valve shaft 5 is provided to pass through the ball valve body 4, and an O-ring γ is inserted between the ball valve body 4 and the support portion 6. A mounting 9 to which a drive unit case 8 is attached is still fixed to the support unit 6 with a set screw 10.

A motor 11 is fixed inside the drive unit case 8, and an output shaft 12 of the motor 11 is attached to the valve shaft 5. Further, a cam 13 is attached to the output shaft 12 to open and close a microswitch 14. 15 and 16
is a piping connection port of the valve body 1. When the motor 11 is energized in the motor-operated valve configured in this way, the ball valve body 4 rotates, and when it has rotated 180 degrees, the cam 13 opens the microswitch 14, the motor 11 is stopped, and the motor-operated valve is turned on. It becomes open state. Generally, when this type of electric valve is installed outdoors, rainwater does not directly infiltrate, but the fitting part A between the drive part case 8 and the mounting part 9, and the support part 6
Water droplets adhere to the fitting portion B of the attachment 9. In such a state, when the outside temperature decreases, the air inside the drive unit case 8 is contracted, and at this time, the fitting parts A and H
There was a phenomenon in which water droplets adhering to the drive unit case 8 entered the drive unit case 8. As a result, the inside of the drive unit case 8 becomes highly humid, leading to faster corrosion of the contacts such as the micro-sinch 14 and shortening its lifespan. The inside of the drive unit case 8 was in a state of condensation. If this condensation condition continues for a long time,
There was a problem in that the insulation resistance of the motor 11 and the microswitch 14 deteriorated, leading to electrical leakage.

OBJECTS OF THE INVENTION An object of the present invention is to provide an electric valve structure that prevents rainwater from entering the drive unit case and prevents dew condensation from continuing for a long period of time.

Structure of the Invention In order to achieve this object, the present invention provides an input power supply introduced from a position below electrical control parts such as a motor and a microswitch, and an input power supply provided at the bottom of the drive unit case located below the input power supply. An electric valve is constituted by a drain hole, a ventilation hole provided between the drain hole and the input power source, and a drain hole cover provided outside the drain hole. This configuration prevents water droplets from entering due to air contraction inside the drive case, and the drainage hole cover also prevents rainwater from splashing.Even if condensation occurs inside the drive case, the ventilation hole will prevent water droplets from entering. It can eliminate condensation quickly.

DESCRIPTION OF EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. 2 and 3. In FIG. 2, reference numeral 21 indicates a valve body, and a valve shaft 22 protrudes from the valve body 21, which is joined to a ball valve body (not shown). A fixing plate 23 is attached to the valve body 21 with screws 24 and 25.
A drive unit case 27 is fixed to the other end of the fixing plate 23 with screws 28 via a rubber drainage hole cover 26 . A motor 29 is fixed inside the drive unit case 27, and a motor shaft 30 of the motor 29 is connected to the valve shaft 22 via a roller clutch 31 and an output shaft 32. A cam 33 is constructed at one end of the output shaft 32, and opens and closes a microswitch 34. A cabtyre cord 36 is wired as an input power source via a cord connector 35 from the side of the drive unit case 2 below the motor 29 and the microswitch 34. Also,
A drain hole 37 is provided at the lowest part of the drive unit case 27 located below the input power source. Furthermore, a power hole 3 is provided on the side of the drive unit case 27 between the drain hole 37 and the input power source.
8 is provided.

FIG. 3 is a diagram showing the drain hole cover 26. The drain hole cover 26 has a cylindrical shape, and one end has a flange portion 3.
9, and the other end 4Q is made by cutting the drain hole cover 26 diagonally in order to make the cross-sectional area of the drain hole cover larger than the cross-sectional area in the direction perpendicular to the central axis of the drain hole cover. It has a shape cut perpendicular to the central axis of the drain hole cover.

To explain the operation of the above configuration, the motor 29 is driven by operation of an operation switch (not shown) while the valve body of the electric valve is installed outdoors or the like, and the valve shaft 22 is rotated to switch the flow path.

When the motor 29 rotates to a predetermined position, a cam 33 provided at one end of the output shaft 32 opens a microswitch 34, thereby stopping the motor 29. When this electric valve is used in rainy conditions, the presence of the drain hole cover 26 prevents droplets of shaved ice from directly entering the drive unit case 27.

Further, since the drain hole cover 26 is cut diagonally and has a large cross-sectional area, even if rainwater droplets directly adhere to the tip of the drain hole cover 26, a water film will not be formed. Furthermore, since the 7-rank section 39 is sandwiched between the drive section cover 27 and the fixing plate 23, the drive section cover 27 and the drain hole cover 26 are closely attached, and rainwater does not enter through the gap between the drive section cover 27 and the fixing plate 230. have an effect.

Effects of the Invention The electric valve of the present invention has an input power source introduced from a position below the motor and electric control parts, a drain hole provided at the lowest part of the drive unit case located below the input power source, and a drain hole. The following effects can be obtained by configuring the drain hole provided between the input power source and the drain hole cover provided outside the drain hole.

(1) The tip of the drain hole cover is cut diagonally to increase the cross-sectional area, and because a water film does not form on the tip of the drain hole cover, the air inside the drive unit case contracts as the outside temperature drops. However, there is no intrusion of rainwater. Although this may sound alarming, rainwater splashes are prevented by the drain hole cover and do not directly enter through the drain hole.

(2) Even if water floods through the ventilation hole, since the motor and microswitch are located below the ventilation hole, water droplets will not adhere to the motor or microswitch, eliminating the risk of electrical leakage. - (3) When condensation occurs inside the drive unit case, the condensed water will be discharged from the drain hole and the condensation will be eliminated in a short time by air movement between the ventilation hole and the drain hole. .

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional electric valve, FIG. 2 is a sectional view of an embodiment of the present invention, and FIG. 3 is a perspective view of a drain hole cover in FIG. 2. 21...Pulp body, 26...Drain hole cover, 2.....Drive unit case, 29...
...Motor, 36...Input power supply (cabtire cord), 37...Drain hole, 38...
Ventilation hole, 39...7 rank part. Name of agent: Patent attorney Toshio Nakao and 1 other artist
1 Figure 2 Figure 3

Claims (2)

[Claims] (1) Consisting of a motor, a drive unit case containing built-in electrical control parts for controlling the operation of the motor, and a valve body that rotates a shaft and switches the flow path by driving the motor, and An input power source introduced from a position below the electrical control component, a drain hole provided at the bottom of the drive unit case located below the input power source, and a communication hole provided between the drain hole and the input power source. An electric valve including a pore and a cylindrical drain hole cover provided outside the drain hole. (2) The drain hole cover has a cylindrical shape, one end of the drain hole cover constitutes a flange portion, and the other end has a cross-sectional area of the drain hole cover in a direction perpendicular to the central axis of the drain hole cover. The motor-operated valve according to claim 1, which is configured to be larger in size compared to the above, and in which the flange portion is removably tightly secured to the drive portion case.