JP4988390B2 - Valve drive actuator - Google Patents

Description

  The present invention relates to a valve drive actuator that is disposed in a liquid and that opens and closes a valve.

  In general, a cargo ship is provided with a plurality of ballast tanks for supplying and draining ballast water and adjusting buoyancy. Each ballast tank is supplied with ballast water when no cargo such as crude oil is loaded, and when cargo is loaded. The hull is stabilized by draining ballast water.

  Ballast water is used by taking seawater at a port, etc., and is supplied or drained to each ballast tank from a seawater intake through a trunk pipe and a branch pipe branched from the seawater. By individually opening and closing, each ballast tank is supplied or drained.

  In many cases, the trunk pipe and the branch pipe are disposed in the ballast tank so as not to impair the cargo loading space. In this case, a valve provided in the branch pipe in each ballast tank and the valve are provided in the ballast tank. A valve driving actuator for opening and closing the valve is also disposed. This valve drive actuator often employs hydraulic drive by a hydraulic cylinder, but the oil leaks into the ballast tank and may contaminate seawater as ballast water. Adoption of an actuator for driving a valve is demanded.

  However, in order to use an electrically driven valve drive actuator in the water, it is necessary to prevent water from entering into electrical parts such as a motor. Since it cannot be easily pulled out of the water, higher waterproofness is required.

  As such a valve drive actuator that is disposed in water and drives the valve to open and close, for example, Patent Document 1 discloses a valve drive actuator in which a motor is housed in a casing and water is prevented from entering the casing. Disclosure.

The valve driving actuator (driving unit) of Patent Document 1 is disposed in water to open and close the valve body, and the motor is housed in a casing composed of a base and a cover. Furthermore, the portion of the base through which the valve plate drive shaft and the cable pass is sealed, and a partition plate is assembled to the base to form a pressurized air chamber between the base and the partition plate, thereby providing a casing. Preventing inundation inside.
JP-A-6-288484 (paragraph numbers 0005 and 0006)

  However, as in Patent Document 1, the structure in which the partition plate is assembled along the wall surface of the casing to form an air chamber for preventing inundation has a large valve drive actuator for the partition plate and the air chamber. Easy to convert.

  It is an object of the present invention to provide a valve drive actuator that can prevent immersion when placed in a liquid such as water and can be downsized.

In order to achieve the above object, a valve driving actuator according to the present invention is arranged in a liquid for opening and closing a valve, and includes a motor for supplying a driving force for opening and closing the valve, and the motor. and a casing which, e Bei and an output shaft for outputting a driving force of the motor to the outside of the casing, and an outer chamber surrounding the inner chamber and the inner chamber in the interior of the casing is provided, from the outside of the casing into the outer chamber In addition to providing a liquid stop structure that prevents immersion, the inner chamber is filled with silicone oil that prevents immersion from the outer chamber to the inner chamber .

According to the above configuration, even if the liquid is temporarily immersed in the casing from a portion through which the output shaft penetrates, the liquid is first stored in the outer chamber and then further immersed in the inner chamber can be delayed. it can. Moreover, since the inner chamber provided inside the casing is filled with silicone oil, it is possible to prevent liquid outside the casing from being immersed into the inner chamber. Here, silicone oil has excellent lubricity and electrical insulation, has low viscosity, is insoluble in water and exhibits excellent water repellency, and is superior to general mineral oil and synthetic oil. And stable against heat. Examples of the silicone oil include dimethylpolysiloxane, specifically, SH200 oil manufactured by Toray Dow Corning.

  Examples of the inner chamber include a gear chamber and / or an electrical component chamber that houses a gear that transmits the driving force of the motor to the output shaft. The gear chamber is a space for accommodating the rotating gear, but since the silicone oil has a low viscosity, the rotational load of the gear can be reduced and the gear efficiency is not lowered. Furthermore, since the lubricity is excellent, the wear can be reduced and the cooling performance can be enhanced. That is, silicone oil combines the function of preventing immersion due to its water repellency and insolubility in water, and the function of improving the durability conventionally obtained by grease. Moreover, since the silicone oil is electrically insulating, it can be filled with the silicone oil using the electrical compartment as an inner chamber.

Further , a sensor for detecting immersion liquid into the casing can be provided in the outer chamber. Then, with the above-described configuration , the immersion of liquid-sensitive parts such as electrical parts arranged in the inner chamber is sufficiently delayed, and a sensor such as a leak sensor provided in the outer chamber is immersed in the casing. Since the liquid is detected, it is possible to detect the liquid accumulated in the outer chamber before it is immersed in the inner chamber.

  As is clear from the above description, according to the present invention, the inner chamber provided in the casing is filled with silicone oil, so that the immersion in the inner chamber such as the gear chamber or the electrical component chamber is prevented and the immersion liquid is prevented. The prevention function and the functions such as the improvement of the durability of the gear and the improvement of the electrical insulation of the electrical component can be used in combination.

  Hereinafter, embodiments of a valve drive actuator according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a valve drive actuator according to the present invention. FIG. 2 is a schematic diagram of the motor.

  The valve drive actuator 1 is for opening and closing a water supply / drainage pipe of a ballast tank of a cargo ship, for example, and individually provides a valve provided on a branch pipe branched from a trunk pipe passing through the inside of a plurality of ballast tanks. It is arranged inside each ballast tank so as to open and close and supply and discharge ballast water for each ballast tank.

  The valve driving actuator 1 includes a motor 6 that supplies a driving force for opening and closing a valve, a casing 7 that houses the motor 6, an output shaft 8 that outputs the driving force of the motor 6 to the outside of the casing 7, and a casing 7 A sensor 9 for detecting water intrusion into the casing 7, a gear chamber 11 serving as an inner chamber for accommodating a gear 10 for transmitting the driving force of the motor 6 to the output shaft 8, a capacitor 12, and the casing 7. An electrical chamber 14 as an inner chamber that houses the switch 13, a motor chamber 15 that houses the motor 6, a sensor chamber 16 that surrounds the gear chamber 11, the electrical chamber 14, and the motor chamber 15, and is an outer chamber in which the sensor 9 is disposed. And a water stop structure for preventing water from entering the sensor chamber 16 from the outside of the casing 7, and the silicone oil A is placed in the gear chamber 11 and the electrical component chamber 14. Is Hama.

  The motor 6 is arranged so that the rotating shaft 17 penetrates the partition wall that partitions the gear chamber 11 and the motor chamber 15 toward the gear chamber 11, and the rotation of the rotating shaft 17 rotates the gear 10. The motor 6 is housed in a motor case 28 and closed by a motor cover 29, and the rotating shaft 17 is supported by a bearing 30. A seal packing 31 is provided on the motor cover 29 to prevent the silicone oil A filled in the gear chamber 11 from entering. Since silicone oil A is non-conductive, there is no problem even if it enters the motor 6.

  The wiring 6a of the motor 6 passes through the partition wall between the motor chamber 15 and the electrical component chamber 14, and is electrically connected from the sensor chamber 16 to the electrical cable 18 that passes through the partition wall and is wired to the electrical component chamber 14.

  The electric cable 18 is connected to an external AC power source via the underwater connector 19, and is connected to the sensor 9 disposed in the sensor chamber 16 through the casing 7 and further through the partition wall. Inside the electrical compartment 14, it is connected to a switch 13 and a capacitor 12 that detect the opening / closing position of the valve.

  The casing 7 is formed by covering the upper opening of the container-like base 22 opened upward with a cover-like container-like cover 23, and a bearing 24 for receiving the output shaft 8 is formed so as to penetrate the bottom. Yes.

  Next, the operation of the valve drive actuator 1 will be described. First, the rotation shaft 17 of the motor 6 is rotated in the opening direction by switching the external operation switch from “stop” to “open”.

  The rotation of the rotating shaft 17 of the motor 6 is transmitted to the worm shaft 25 and the worm wheel 26 through the gear 10, and is transmitted to the drive shaft 8 while being decelerated by the worm shaft 25 and the worm wheel 26 to open the valve. To drive. When the opening position of the valve reaches the upper limit, a cam (not shown) turns off the switch 13 and stops driving the valve.

  Further, by switching the external operation switch to “closed”, the rotating shaft 17 of the motor 6 is rotated in the closing direction. The operation in this closing direction drive is the same as that in the opening direction drive except that the rotation direction of each rotating member from the motor 6 to the valve is opposite. The worm shaft 25 is connected to a handle 27 provided so as to penetrate the casing 7 in and out, so that the output shaft 8 can be manually rotated.

  Here, the water stop function of the valve drive actuator 1 will be described. First, the water stop structure prevents water from entering the casing 7 from the outside, and delays water immersion into the casing 7 itself. The water-stop structure prevents water from entering between the gap between the output shaft 8 and the bearing 24, the penetration portion of the electric cable 18, the penetration portion of the handle 27, the connection portion between the base 22 and the cover 23, and the like. -Ring, sheet packing, cable clamp 28, potting treatment, sheet gasket, etc. can be used.

  Next, the water immersed in the casing 7 is stored in the sensor chamber 16 without going to the gear chamber 11 and the electrical component chamber 14 immediately. Moreover, even if a certain amount of water accumulates in the sensor chamber 16, the silicone oil A filled in the gear chamber 11 and the electrical component chamber 14 prevents water from entering the gear chamber 11 and the electrical component chamber 14 from the sensor chamber 16. . Further, when the sensor 9 detects the water accumulated in the sensor chamber 16, before the water in the sensor chamber 16 is infiltrated into the gear chamber 11 and the electrical equipment chamber 14, an abnormal inundation is output. The sensor 9 is a water leakage sensor or the like.

  According to the above configuration, the internal space of the casing 7 is divided into the gear chamber 11 as the inner chamber, the electrical component chamber 14 as the inner chamber, the motor chamber 15, and the sensor chamber 16 as the outer chamber. Even if it is immersed in the interior of the motor, it is possible to sufficiently delay the water immersion into the gear chamber 11, the electrical component chamber 14, and the motor chamber 15.

  Furthermore, since the gear chamber 11 and the electrical component chamber 14 are filled with the silicone oil A, it is possible to prevent water from entering the gear chamber 11 and the electrical component chamber 14 from the sensor chamber 16. As a result, the rotating shaft 17 penetrates through the gear chamber 11 and water can also be prevented from entering the motor chamber 15 that houses the motor 6 through which the wiring 6a penetrates into the electrical compartment 14, and the wiring 6a and switch of the motor 6 can be prevented. 13 and the capacitor | condenser 12 etc. can prevent the water immersion to the site | part weak to water.

  In addition, since the sensor 9 disposed in the sensor chamber 16 detects water intrusion into the casing 7, a signal such as a caution or warning is issued before the gear chamber 11, the electrical equipment chamber 14, and the motor chamber 15 are submerged. It can be pumped out or switched to manual operation with the handle 27.

  Further, since the silicone oil A has a low viscosity, even if it is filled in the gear chamber 11, the gear efficiency is not lowered, and the lubricity is excellent, so that the wear of the gear 10 is reduced and the cooling property is reduced. Can be increased. Thereby, the silicone oil A also has a function of improving durability of the gear 10 and the like in addition to a function of preventing immersion due to its water repellency and insolubility to water. Furthermore, since the silicone oil A is electrically insulating, there is no problem even if the electrical chamber 14 is filled.

  In addition, this invention is not limited to said embodiment, A change can be suitably added within the scope of the present invention. For example, the valve drive actuator 1 can be used not only by being placed in water such as ballast water but also by being placed in a liquid other than water.

Schematic view showing a valve driving actuator according to the present invention. Schematic diagram of motor

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve drive actuator 6 Motor 7 Casing 8 Output shaft 9 Sensor 11 Gear chamber 14 Electrical chamber 16 Sensor chamber

Claims (3)

A valve driving actuator arranged in the liquid to open and close the valve;
A motor that supplies a driving force for opening and closing the valve; a casing that houses the motor; and an output shaft that outputs the driving force of the motor to the outside of the casing;
The outer chamber is provided surrounding the inner chamber and the inner chamber inside the casing, with stop solution structure that prevents immersion liquid to the outer chamber from the outside of the casing is provided, on the inner chamber, the outer An actuator for driving a valve, which is filled with silicone oil that prevents immersion of liquid from the chamber into the inner chamber .   2. The valve drive actuator according to claim 1, wherein the inner chamber is a gear chamber and / or an electrical component chamber that houses a gear that transmits a driving force of a motor to an output shaft. Before SL outside chamber, the valve driving actuator according to claim 1 or 2, characterized in that the sensor for detecting the immersion liquid to the casing is provided.