JP5296935B2 - Ship valve device - Google Patents

Description

  The present invention relates to a hold valve device that is provided in a hatch cover that opens and closes a hatch of a hold and controls the pressure of gas in the hold.

A ship equipped with a hatch (loading port) for loading cargo into the cargo hold (funnel) is equipped with an openable / closable hatch cover (port opening cover) that covers the hatch.
This hatch cover is generally made of metal and is mainly folded or slid. However, many of the hatch covers are sufficiently considered for watertightness and airtightness.

  For example, in bulk carriers such as grain, water intrusion from the hatch cover has a significant effect on the cargo loaded, so it is necessary to reliably maintain the water and airtight functions of the hatch cover. is there.

  In this type of ship, the operation of injecting seawater into the ballast tank and discharging the seawater in the ballast tank during cargo loading is performed for the purpose of lowering the draft line when empty. Further, during stormy weather, for the purpose of further lowering the draft line at the time of an empty ship, an operation of applying seawater to at least one of a plurality of cargo holds is performed. In this operation, the air pressure in the cargo hold (hereinafter referred to as “ballast cargo hold”) injected during stormy weather is maintained at almost atmospheric pressure by opening the ventilator opening / closing device before operating the seawater pump. I am doing so.

  On the other hand, in a liquid cargo ship such as an oil tanker or a chemical tanker, as described in Patent Document 1, from the viewpoint of ensuring the safety of loading of combustible materials, the pressure difference between the cargo hold or tank and the ambient atmosphere is eliminated. A pressure valve for equalizing the pressure is provided.

  Patent Document 2 describes a technique in which a pressure relief valve and a vacuum valve are provided as inert gas injection / replacement equipment for a ballast tank of a liquid cargo ship. The pressure relief valve is adjusted to “open” when the pressure in the ballast tank exceeds the specified pressure, and the vacuum valve is adjusted to be “open” when the pressure in the ballast tank drops below the specified pressure. Has been.

Japanese Patent No. 4282326 JP 2009-61823 A

  By the way, the seawater in the ballast cargo hold that was poured during stormy weather, like a bulk carrier of grain, will be discharged after the weather recovers, but this operation was performed with the ballast cargo hold ventilator closed. Otherwise, there is a problem that the inside of the ballast cargo hold becomes negative pressure and the hatch cover is deformed so as to bend toward the inside of the ballast cargo hold.

  This problem does not occur if the ventilator is normally open. However, since this ventilator is often closed during stormy weather, there is a possibility that the seawater pump may be operated while the ventilator is closed when the seawater in the ballast cargo hold is discharged after the weather recovers.

  As a countermeasure against this point, there is a method of providing a vacuum valve that automatically opens when the atmospheric pressure in the ballast cargo hold becomes a negative pressure equal to or lower than a set value. As a place where this vacuum valve is provided, it is conceivable that it is on a deck directly above the ballast cargo hold or on a hatch cover, but this has the following problems.

  The method of providing a vacuum valve on the deck that automatically opens and closes depending on the atmospheric pressure in the ballast cargo hold requires measures to prevent the intrusion of seawater that rides on the deck during navigation, and because it is installed at a low position on the deck, it automatically opens and closes For example, it is necessary to take measures to prevent malfunction of the vacuum valve during stormy weather with low atmospheric pressure.

When the vacuum valve that automatically opens and closes is provided on the hatch cover, the position of the vacuum valve is higher than the deck, which is effective from the viewpoint of preventing seawater intrusion. Since it protrudes, there is a problem that interferes with various operations.
In addition, when the hatch cover is of a double fold type or a slide type as described above, there is a problem that the vacuum valve itself becomes an obstacle when the hatch cover is opened or closed, and a smooth opening / closing operation cannot be performed.

  The present invention has been made in consideration of the above points, and by securing the necessary height from the deck, it is configured not to protrude on the hatch cover, so that the hatch cover can be opened and closed and various kinds of operations can be performed. It is an object of the present invention to provide a cargo hold valve device having a novel structure that enables smooth work without interfering with work and that can exhibit an excellent function for preventing seawater from entering.

The present invention is a hold valve device provided in a hatch cover for opening and closing a hold,
When the pressure of the gas guided to the valve box reaches the first set value, the first valve body that is opened by the pressure, and the pressure of the gas guided to the valve box is the first setting. A second valve body that is opened by the pressure when the second set value is lower than the value, and a gas discharge port through which the gas in the valve box is discharged when the first valve body is open And an outside air introduction port through which outside air is introduced into the valve box when the second valve body is in an open state, the valve box having a mounting flange attached to a side surface of the hatch cover, The communication port is provided.

  In the present invention, when the pressure of the gas guided to the valve box reaches the first set value, the first valve body is opened, and the gas in the valve box is discharged from the gas discharge port. When the pressure of the gas guided to the valve box reaches the second set value, the second valve body is opened, and outside air is introduced into the valve box from the outside air inlet. Therefore, for example, when the first set value is set higher than the atmospheric pressure, the second set value is set lower than the atmospheric pressure, and the communication port of the valve box is communicated with the inside of the hold, the pressure inside the hold is When the positive pressure exceeds 1 set value, the gas in the hold is discharged to the outside. When the atmospheric pressure in the hold becomes a negative pressure equal to or lower than the second set value by operating a seawater pump or the like, outside air is introduced into the hold. Thereby, it becomes possible to prevent the hatch cover from being deformed.

  Further, since the valve box is provided with a mounting flange attached to the side surface of the hatch cover and a communication port with the inside of the hold, the mounting position of the valve box becomes the side surface of the hatch cover. As a result, while ensuring the required height from the deck, it can be configured so that it does not protrude on the hatch cover, and since it does not interfere with the opening and closing work of the hatch cover and various work, smooth work is possible. In addition, it is possible to exhibit an excellent function for preventing seawater from entering.

In a preferred embodiment of the present invention, a side opening leading to the inside of the hold is provided on a side face of the hatch cover, and the side opening and the communication opening communicate with each other.
When comprised in this way, it can comprise as a horizontal type | mold valve apparatus attached directly to the side surface of a hatch cover.

  In a preferred embodiment of the present invention, the side opening of the hatch cover is provided on at least one of the side surfaces of the hatch cover that face each other in the longitudinal direction of the hull, and the communication opening of the valve box is provided on the mounting flange. It is provided in the center part.

  According to the present invention, since the attachment position of the valve device to the hatch cover is the side surface opposed in the longitudinal direction of the hull, it is a preferable form as a countermeasure for preventing intrusion of seawater. During stormy weather, of the sides of the hatch cover, the sides and decks that face each other in the width direction of the hull are susceptible to the seawater that rides on the deck. This is because the target side is the target.

In a preferred embodiment of the present invention, the valve box is provided with a wind tunnel covering the gas discharge port, and the height of the upper end of the wind tunnel is lower than the upper surface of the hatch cover.
Thus, the valve device which does not protrude from the upper surface of the hatch cover can be obtained by making the height of the upper end portion of the wind tunnel lower than the upper surface of the hatch cover. Thereby, it can be set as the structure which does not become obstructive in the opening / closing operation | work of a hatch cover, or various operations.

  In a preferred embodiment of the present invention, the valve box has a large-diameter portion formed flat, and the first valve body and the second valve body are arranged in the large-diameter portion at intervals in the vertical direction, and the attachment A flange is provided on the peripheral wall side of the large-diameter portion.

In this way, the valve box has a large-diameter portion formed flat, and the valve bodies are arranged above and below the large-diameter portion, so the height of the valve box is secured while ensuring the volume in the valve box. Can be lowered. Further, by providing the mounting flange on the peripheral wall side of the large-diameter portion of the valve box, it is possible to configure a horizontal type valve device in which the height of the entire valve box is suppressed.

  In a preferred embodiment of the present invention, the gas discharge port and the outside air introduction port are arranged with a space in the vertical direction, the gas discharge port is arranged upward, and the outside air introduction port is arranged downward. It is characterized by that.

  Thus, when the gas discharge port is directed upward at the upper position of the valve box, the gas discharge port can be arranged at a higher position and covered with a wind tunnel. This makes it possible to always use the first valve body as a pressure relief valve even when there is a load in the cargo hold (the draft is deep).

  In addition, when the outside air inlet is arranged downward at the lower position of the valve box, there is almost no seawater climbing on the deck when the second valve body is open (when the draft is shallow), Since there is no influence on the target cargo hold, the second valve body can be normally used as a vacuum valve.

  In a preferred embodiment of the present invention, a moisture reflector having a larger diameter than the outside air inlet is provided outside the valve box and below the outside air inlet.

  In this way, by providing a reflecting plate formed outside the valve box and below the outside air inlet, the reflecting plate has a larger diameter than that of the outside air inlet, the reflector functions as a so-called wave return.

  According to the present invention, it is possible to perform smooth work without interfering with the opening and closing work and various work of the hatch cover by ensuring the necessary height from the deck and not projecting on the hatch cover. In addition, it is possible to exert an excellent function for preventing seawater from entering.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, where (a) is a longitudinal sectional view, (b) is a partial side view showing a mounting flange, and (c) is a bottom view of a reflector for moisture. It is a longitudinal cross-sectional view for demonstrating operation | movement of one Embodiment of this invention. It is a longitudinal cross-sectional view for demonstrating operation | movement of one Embodiment of this invention. It is a top view which shows the attachment aspect of the valve apparatus which concerns on embodiment of this invention. It is a side view which shows the attachment aspect of the valve apparatus which concerns on embodiment of this invention. It is the elements on larger scale of FIG. 5 of the valve apparatus which concerns on embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
In these figures, the code | symbol 1 has shown the valve apparatus for cargo holds which concerns on this embodiment. As shown in FIGS. 5 to 6, the valve device 1 is provided on a side surface 53 of a hatch cover 52 that opens and closes a hatch 51 of the hold 50, and includes a pressure relief valve P and a vacuum valve V described later. That is, the valve device 1 is configured as a PV valve.

Next, these details will be described.
As shown in FIG. 1, when the pressure of the gas guided to the valve box 2 and the valve box 2 reaches a predetermined pressure (first set value), the valve device 1 is opened by the pressure. When the pressure of the gas guided to the valve body 10 and the valve box 2 reaches a predetermined pressure (second set value) lower than the first set value, the second valve body 20 is opened by the pressure. And.

  Further, the valve device 1 includes a gas discharge port 3 through which the gas in the valve box 2 is discharged when the first valve body 10 is open, and the valve box 2 when the second valve body 20 is open. The outside air introduction port 4 through which the outside air is introduced, the mounting flange 5 attached to the side surface 53 of the hatch cover 52, and the communication port 5a to the inside of the hold 50 are provided. The communication port 5 a opens at the center of the mounting flange 5.

  The valve box 2 is provided with a valve seat 21 of the first valve body 10 and a valve seat 22 of the second valve body 20, and a space surrounded by the valve seats 21 and 22 is the gas discharge port. 3 and the outside air inlet 4.

  The valve box 2 has a flat large-diameter portion 23 formed so as to spread in the lateral direction, and the first valve body 10 and the second valve body 20 are arranged on the large-diameter portion 23 with an interval in the vertical direction. The mounting flange 5 is provided on the peripheral wall side of the large diameter portion 23.

  In addition, the gas discharge port 3 and the outside air introduction port 4 are arranged at intervals in the vertical direction, the gas discharge port 3 is arranged upward, and the outside air introduction port 4 is arranged downward. The valve box 2 is provided with a wind tunnel 6 that covers the gas outlet 3. The height of the upper end portion of the wind tunnel 6 is designed to be lower than the upper surface of the hatch cover 52 as shown in FIG. On the outside of the valve box 2 and below the outside air introduction port 4, a moisture reflecting plate 7 having a larger diameter than the outside air introduction port 4 is provided.

  Here, reference numerals 61 and 62 denote stud bolts and nuts for fixing the wind tunnel 6 to the valve box 2 at intervals, and 63 denotes an eye nut. Reference numerals 71 and 72 denote stud bolts and cap nuts for fixing the reflecting plate 7 to the valve box 2 at intervals. A cylindrical member 73 formed of a mesh material is provided between the outside air inlet 4 of the valve box 2 and the reflection plate 7 for flameproofing and insectproofing.

  The 1st valve body 10 and the 2nd valve body 20 are provided so that an up-and-down movement is possible individually by the support member provided in the center part of the valve box 2. As shown in FIG. In this embodiment, an upper rod 11 that is horizontally supported in a form penetrating the first valve body 10, a cylindrical rod 12 that is coaxially connected to the lower portion of the upper rod 11, and a form that penetrates the second valve body 20. And a lower rod 13 supported horizontally.

  The upper end of the upper rod 11 is inserted into a cylindrical member 8 provided at the center of the wind tunnel 6 and supported so as to be movable up and down. The upper end portion of the lower rod 13 is coaxially inserted into the cylindrical rod 12. The lower end portion of the lower rod 13 is inserted into a cylindrical member 9 provided at the central portion of the reflecting plate 7 and supported so as to be movable up and down. Thereby, the 1st valve body 10 and the 2nd valve body 20 are comprised so that an up-down movement is possible separately. The upper end surface of the cylindrical member 8 and the lower end surface of the cylindrical member 9 are closed for water stop.

  The first valve body 10, the second valve body 20, the upper rod 11, the cylindrical rod 12, and the lower rod 13 are made of metal and have a valve closing function of necessary pressure by utilizing their own weights. Designed to. That is, it is designed as a self-weight type valve closing device.

A pressure relief valve P is constituted by the first valve body 10, its valve seat 21, the gas exhaust port 3 of the valve box 2, the communication port 5a, and the like. Further, a vacuum valve V is constituted by the second valve body 20, its valve seat 22, the outside air inlet 3 of the valve box 2, the communication port 5a and the like.

  As shown in FIGS. 5 and 6, the side surface 53 of the hatch cover 52 is provided with a side surface opening 54 communicating with the inside of the hold 50, and the side surface opening 54 communicates with the communication port 5 a of the valve box 2. The side opening 54 is provided with a receiving flange 55 that is screwed to the mounting flange 5 of the valve box 2.

  In the present embodiment, two side openings 54 of the hatch cover 52 are provided on each side face of the hatch cover 52 facing each other in the longitudinal direction of the hull, and the communication port 5a of the valve box 2 is provided with the mounting flange 5. It is provided in the central part.

  Thus, since the attachment position of the valve apparatus 1 with respect to the hatch cover 52 is made into the side surface which opposes in the length direction of a hull, it becomes a preferable form as a countermeasure against intrusion of seawater. During stormy weather, of the side surfaces of the hatch cover 52, the side surfaces facing each other in the width direction of the hull, the deck 56, etc. are easily affected by the seawater that rides on the deck. This is because the opposite side surface 53 is targeted.

  When the pressure of the gas guided to the valve box 2 reaches the first set value, the valve device 1 configured in this way has its first valve due to the pressure acting on the first valve body 10, as shown in FIG. The body 10 is lifted and opened, and the gas in the valve box 2 is discharged from the gas outlet 3.

  When the pressure of the gas guided to the valve box 2 reaches the second set value, the second valve body 20 is lifted and opened by the pressure acting on the second valve body 20, as shown in FIG. Outside air is introduced into the valve box 2 from the inlet 4.

  Therefore, the first set value is set higher than the atmospheric pressure, the second set value is set lower than that, and in the state where the communication port 5a of the valve box 2 communicates with the inside of the hold 50, the inside of the hold 50 When the atmospheric pressure becomes a positive pressure equal to or higher than the first set value, the gas in the hold 50 is discharged to the outside. When the air pressure in the hold 50 becomes a negative pressure equal to or lower than the second set value due to the operation of a seawater pump or the like, outside air is introduced into the hold. As a result, the hatch cover 52 can be reliably prevented from being deformed. The second set value may be at least as long as the hatch cover 52 is not deformed.

  Further, since the valve box 2 is provided with the mounting flange 5 attached to the side surface 53 of the hatch cover 52 and the communication port 5a to the inside of the hold 50, the mounting position of the valve box 2 is the same as the side surface 53 of the hatch cover 52. Become. As a result, it is possible to achieve a configuration that does not protrude onto the hatch cover 52 while ensuring a necessary height from the deck 56. Thereby, since it does not get in the way of the opening / closing operation | work and various operations of the hatch cover 52, a smooth operation | work becomes possible and the function excellent also in the countermeasure against intrusion of seawater can be exhibited.

  In the present embodiment, a side opening 54 leading to the inside of the hold 50 is provided on the side surface of the hatch cover 52, and the side opening 54 and the communication port 5 a communicate with each other. It can be configured as a mold valve device.

  Further, according to the present embodiment, the height of the upper end portion of the wind tunnel 6 is made lower than the upper surface of the hatch cover 52, whereby the valve device that does not protrude from the upper surface of the hatch cover 52 can be obtained. Thereby, it can be set as the structure which does not become obstructive in the opening / closing operation | work of the hatch cover 52, or various operations.

Further, the valve box 2 has a large-diameter portion 23 formed in a flat shape, and the first valve body 10 and the second valve body 20 are arranged above and below the large-diameter portion 23. The height of the valve box 2 can be reduced while securing the volume. Further, by providing the mounting flange 5 on the peripheral wall side of the large-diameter portion 23 of the valve box 2, it is possible to configure a horizontal type valve device in which the height of the entire valve box is suppressed.

  Moreover, when the gas exhaust port 3 is made upward in the upper position of the valve box 2, the gas exhaust port 3 can be arranged at a higher position and covered with a wind tunnel. This makes it possible to always use the first valve body 10 as a pressure relief valve even when there is a load in the hold 50 (the draft is deep).

  In addition, when the outside air introduction port 4 is disposed downward at a position below the valve box 2, seawater rides on the deck 56 when the second valve body 20 is open (when the draft is shallow). The second valve body 20 can be normally used as a vacuum valve because there is almost no impact on the target hold 50.

  Further, by providing a reflecting plate 7 outside the valve box 2 and below the outside air introduction port 4 and having a diameter larger than that of the outside air introduction port 4, the reflection plate 7 functions as a so-called wave return. Demonstrate.

DESCRIPTION OF SYMBOLS 1 Valve device 2 for cargo boxes 3 Gas discharge port 4 Outside air introduction port 5 Mounting flange 5a Communication port 6 Wind tunnel 7 Reflector plate 10 First valve body 11 Upper rod 12 Cylindrical rod 13 Lower rods 21, 22 Valve seat

Claims (5)

A hold valve device provided in a hatch cover for opening and closing a hold,
A valve box,
When the pressure of the gas guided to the valve box reaches a first set value, the first valve body that is opened by the pressure;
When the pressure of the gas guided to the valve box reaches a second set value lower than the first set value, the second valve body that is opened by the pressure;
A gas discharge port through which the gas in the valve box is discharged when the first valve body is open;
An outside air introduction port through which outside air is introduced into the valve box when the second valve body is open,
The valve box is provided with a mounting flange attached to the side surface of the hatch cover, and a communication port with the inside of the hold,
A cargo valve device, wherein a moisture reflecting plate having a larger diameter than the outside air inlet is provided outside the valve box and below the outside air inlet.   2. The hold according to claim 1, wherein a side opening communicating with the inside of the hold is provided on a side surface of the hatch cover, and a communication opening communicating with the side opening is provided on the valve box. Valve device.   A side opening of the hatch cover is provided on at least one of the side faces of the hatch cover that face each other in the longitudinal direction of the hull, and a communication port of the valve box is provided in a central portion of the mounting flange. The hold valve device according to claim 1, wherein the hold valve device is provided.   The said valve box is provided with the wind tunnel which covers the said gas exhaust port, The height of the upper end part of the wind tunnel is lower than the upper surface of the said hatch cover, The any one of Claims 1-3 characterized by the above-mentioned. Valve device for the ship. The gas discharge port and the outside air introduction port are arranged at an interval in the vertical direction, the gas discharge port is arranged upward, and the outside air introduction port is arranged downward. Item 5. The cargo valve device according to any one of Items 1 to 4 .

Images