Ventilation non-return device for overflow pipe

Abstract

The utility model discloses an overflow pipe ventilation non-return device which comprises a non-return body and a floating ball, two opposite side walls of the non-return body are respectively connected with an inlet connecting pipe and an outlet connecting pipe, the side wall of the top of the non-return body is connected with a ventilation connecting pipe, and the top of the non-return body is connected with the floating ball. The inlet connecting pipe and the outlet connecting pipe are respectively connected with an upstream port and a downstream port of the overflow header pipe, and the ventilation connecting pipe is connected with the ventilation pipe; a plurality of guide rods are vertically arranged on the bottom wall of an inner cavity of the non-return body and evenly distributed with the center point of the bottom wall of the non-return body as the center, a floating ball is arranged on the inner sides of the guide rods, and the distance between every two guide rods oppositely arranged relative to the center point of the bottom wall of the non-return body is not smaller than the diameter of the floating ball. The distance between every two adjacent guide rods is smaller than the diameter of the floating ball. The ventilation non-return device for the overflow pipe can ventilate under the normal condition, can prevent liquid in the main pipe from flowing backwards during overflow or soaking in water, and also can ensure that the ventilation non-return device can be smoothly opened and closed when being used on a heavy oil overflow pipe with higher viscosity.

Description

Technical Field

[0001] The utility model relates to the technical field of shipbuilding, in particular to an overflow pipe ventilating check device. Background Art

[0002] In the conventional design of the closed overflow venting system for fuel storage tanks, an inverted U-shaped venting overflow elbow is set on each fuel tank vent pipe and then connected to the common overflow main pipe. The overflow main pipe is used to discharge the fuel to the fuel overflow tank located at the double bottom of the engine room. Ventilation is achieved through the overflow main pipe or overflow tank. It is usually required that the highest point of the venting elbow is higher than the tank damage waterline provided by the overall professional.

[0003] However, due to the design characteristics of some ships, the damaged waterline of the fuel tank is very high, and the vent pipe elbow needs to be raised to a very high position, which not only brings great difficulties to the layout of the vent pipe, but also increases the pressure on the hull structure, thereby increasing the thickness and weight of the cabin structure. If a check valve is installed on the vent elbow, it can prevent the overflow of the main pipe from flowing back into the cabin, thereby reducing the height of the vent elbow below the damaged waterline, but the check valve also needs to have a venting function. For the venting of heavy oil tanks, it is also necessary to consider the impact of the accumulation of grease in the valve on the difficulty of opening the valve disc after a long time. Conventional check valves cannot meet the above functional requirements. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides an overflow pipe breathable check device, which can be breathable under normal circumstances and can prevent the main pipe liquid from backflowing when overflowing or flooded. The device can also ensure smooth opening and closing when used on the heavy oil overflow pipe with high viscosity.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A breathable check device for an overflow pipe comprises a check body and a float, wherein an inlet connecting pipe and an outlet connecting pipe are respectively connected to two opposite side walls of the check body, and a breathable connecting pipe is connected to the top side wall of the check body, wherein the inlet connecting pipe and the outlet connecting pipe are respectively connected to the upstream port and the downstream port of the overflow main pipe through flanges, and the breathable connecting pipe is connected to an inverted U-shaped breathable pipe from the top of the cabin through flanges; a plurality of guide rods are vertically arranged on the bottom wall of the inner cavity of the check body, and the plurality of guide rods are evenly arranged with the center point of the bottom wall of the check body as the center, and the float is placed in a space surrounded by the plurality of guide rods, and the distance between two guide rods relatively arranged relative to the center point of the bottom wall of the check body is not less than the diameter of the float, and the distance between two adjacent guide rods is less than the diameter of the float.

[0007] Furthermore, the device also includes a bottom filter screen, which is arranged in the lower part of the inner cavity of the check body, and multiple guide rods are passed through the bottom filter screen, and the bottom filter screen is fixed by nuts that are sleeved on each guide rod and located on the upper and lower sides of the bottom filter screen; a distance is set between the bottom filter screen and the bottom wall of the check body, and the float is located above the bottom filter screen.

[0008] Furthermore, a vacuum breaking hole is opened on the top wall or the side wall of the check body, a vacuum breaking valve is arranged in the vacuum breaking hole, and the vacuum breaking valve and the check body are connected by threads.

[0009] Furthermore, the vacuum breaking valve is located on one side of the air-permeable connecting pipe on the top wall of the check body.

[0010] Furthermore, a discharge hole is provided on the side of the bottom wall of the check body close to the outlet connecting pipe, a discharge seat ring is fixed on the outer side of the discharge hole, and a discharge plug is provided in the discharge seat ring.

[0011] Furthermore, an ear plate is fixed on one side of the discharge seat ring, and hanging rings are fixed on the ear plate and on the outer end side wall of the discharge plug, and the two hanging rings are connected by a steel wire rope.

[0012] Furthermore, a discharge plug sealing gasket is provided between the discharge plug and the free end surface of the discharge seat ring.

[0013] Furthermore, rubber bushings are provided on the inner side wall and the outer end surface of the air-permeable connecting pipe.

[0014] Furthermore, an inspection hole is provided on one side wall of the check body, and an inspection cover plate connected with the check hole by a plurality of bolts and nuts is provided on the outside of the inspection hole.

[0015] Furthermore, a cover plate sealing ring is provided between the inspection cover plate and the outer side wall of the check body; and a gasket is provided between the nut and the inspection cover plate.

[0016] The utility model of the overflow pipe ventilation check device, when working, the floating ball in the cavity is located on the bottom filter screen, the cabin ventilation enters the check body cavity through the top ventilation pipe, and then enters the overflow main pipe through the outlet connecting pipe, so as to realize the free ventilation function of the cabin. When an overflow occurs during the filling process of a cabin, the excess liquid flows to the overflow main pipe through the ventilation elbow of the cabin, and then is discharged to the overflow cabin on the ship by the overflow main pipe. When the overflow volume increases or other cabins are damaged and soaked, the overflow main pipe will be filled with liquid. At this time, the device is filled with liquid, and the floating ball floats up under the action of buoyancy, contacts with the rubber bushing in the upper ventilation pipe, seals the ventilation interface, and prevents the liquid in the overflow main pipe from entering the corresponding cabin. After the liquid in the main pipe is discharged, the floating ball automatically returns to its position. The bottom filter screen of the floating ball is made of stainless steel, and keeps a certain distance from the bottom of the main body cavity, which is used to isolate the floating ball and the grease accumulated at the bottom, so as to avoid the floating ball being difficult to move after being stuck with grease and causing the upper ventilation port rubber bushing to be poorly sealed.

[0017] The vacuum breaking valve on the check body does not operate under normal circumstances. However, when a large amount of liquid flows out rapidly from the overflow main pipe, negative pressure appears in the check body cavity. At this time, the vacuum breaking valve automatically opens to connect to the external atmosphere to ensure that there is no negative pressure in the cabin connected to the device. As the air pressure in the check body cavity recovers, the valve disc automatically falls back.

[0018] In daily work, the device does not require manual intervention and works automatically. During maintenance, the operator can open the side inspection cover to check the condition of the internal float and drain the residual liquid in the cavity by unscrewing the drain cock at the bottom.

[0019] The overflow pipe vent check device of the utility model realizes that the height of the overflow main pipe in the closed overflow system of the ship is not limited by the damaged waterline, avoids the difficulties caused by the excessively high damaged waterline on the layout of the overflow main pipe and the cabin vent pipe, and automatically prevents the vacuum occurring during the overflow main pipe liquid backflow and the overflow process; provides connecting pipes and flanges for easy installation and construction on board, and the design of the inspection cover and the drain plug facilitates the replacement of internal components and cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 An internal side view of the overflow pipe ventilating check device of the utility model;

[0021] Figure 2 It is an external side view of the overflow pipe breathable check device of the utility model;

[0022] Figure 3 for Figure 2 Middle AA direction attempt;

[0023] Figure 4 It is a schematic diagram of the use state of the overflow pipe air-permeable check device described in the utility model.

[0024] Among them, 1-inlet connecting pipe, 2-outlet connecting pipe, 3-ventilation connecting pipe, 4-check body, 5-float, 6-guide rod, 7-bottom filter, 8-nut, 9-vacuum breaking valve, 10-discharge seat ring, 11-discharge plug, 12-discharge plug sealing gasket, 13-ear plate, 14-wire rope, 15-hanging ring, 16-handle, 17-inspection cover, 18-bolt, 19-washer, 20-cover sealing ring, 21-bolt, 22-rubber bushing, 23-overflow main pipe, 24-ventilation pipe, 25-cabinet. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figure 1-Figure 4 As shown, an overflow pipe breathable check device includes a check body 4, a bottom filter screen 7 and a float 5, wherein an inlet connecting pipe 1 and an outlet connecting pipe 2 are respectively connected to two opposite side walls of the check body 4, and a breathable connecting pipe 3 is connected to the top side wall of the check body 4, wherein the inlet connecting pipe 1 and the outlet connecting pipe 2 are respectively connected to the upstream port and the downstream port of the overflow main pipe 23 through flanges, and the breathable connecting pipe 3 is connected to the inverted U-shaped breathable pipe 24 from the top of the cabin through a flange; a plurality of guide rods 6 are vertically arranged on the bottom wall of the inner cavity of the check body 4, and the plurality of guide rods 6 are evenly arranged with the center point of the bottom wall of the check body 4 as the center, and the float 5 is placed in a space surrounded by the plurality of guide rods 6, and the distance between two guide rods 6 arranged opposite to the center point of the bottom wall of the check body 4 is not less than the diameter of the float 5, and the distance between two adjacent guide rods 6 is less than the diameter of the float 5; rubber bushings 22 are laid on the inner side wall and the outer end face of the breathable connecting pipe 3.

[0027] The bottom filter screen 7 is arranged at the lower part of the inner cavity of the check body 4, and multiple guide rods 6 are passed through the bottom filter screen 7. The bottom filter screen 7 is fixed by nuts 8 which are sleeved on each guide rod 6 and located on the upper and lower sides of the bottom filter screen 7; a distance is set between the bottom filter screen 7 and the inner bottom wall of the check body 4, and the float 5 is located above the bottom filter screen 7.

[0028] A vacuum breaking hole is provided on the top wall of the check body 4 and on one side of the air-permeable connecting pipe 3, a vacuum breaking valve 9 is provided in the vacuum breaking hole, and the vacuum breaking valve 9 and the check body 4 are connected by threads; a discharge hole is provided on the side of the bottom wall of the check body 4 close to the outlet connecting pipe 2, a discharge seat ring 10 is fixed on the outside of the discharge hole, and a discharge plug 11 is provided in the discharge seat ring 10; an ear plate 13 is fixed on one side of the discharge seat ring 10, and hanging rings 15 are fixed on the ear plate 13 and on the outer side wall of the discharge plug 11, and the two hanging rings 15 are connected by a wire rope 14; a discharge plug sealing gasket 12 is provided between the discharge plug 11 and the free end face of the discharge seat ring 10.

[0029] An inspection hole is provided on one side wall of the check body 4, and an inspection cover plate 17 connected by multiple bolts 18 and nuts 8 is provided on the outside of the inspection hole; a cover plate sealing ring 20 is provided between the inspection cover plate 17 and the outer side wall of the check body 4; and a gasket 19 is provided between the nut 8 and the inspection cover plate 17.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An overflow pipe venting check device, characterized in that: It includes a check body and a float, wherein an inlet connecting pipe and an outlet connecting pipe are respectively connected to two opposite side walls of the check body, and a breathable connecting pipe is connected to the top side wall of the check body, wherein the inlet connecting pipe and the outlet connecting pipe are respectively connected to the upstream port and the downstream port of the overflow main pipe through flanges, and the breathable connecting pipe is connected to an inverted U-shaped breathable pipe from the top of the cabin through a flange; a plurality of guide rods are vertically arranged on the bottom wall of the inner cavity of the check body, and the plurality of guide rods are evenly arranged with the center point of the bottom wall of the check body as the center, and the float is placed in a space surrounded by the plurality of guide rods, and the distance between two guide rods relatively arranged relative to the center point of the bottom wall of the check body is not less than the diameter of the float, and the distance between two adjacent guide rods is less than the diameter of the float.

2. The overflow pipe venting check device according to claim 1, characterized in that: The device also includes a bottom filter screen, which is arranged in the lower part of the inner cavity of the check body. Multiple guide rods are passed through the bottom filter screen, and the bottom filter screen is fixed by nuts that are sleeved on each guide rod and located on the upper and lower sides of the bottom filter screen; a distance is set between the bottom filter screen and the bottom wall of the check body, and the float is located above the bottom filter screen.

3. The overflow pipe venting check device according to claim 1, characterized in that: A vacuum breaking hole is provided on the top wall or the side wall of the check body, a vacuum breaking valve is provided in the vacuum breaking hole, and the vacuum breaking valve and the check body are connected by threads.

4. The overflow pipe venting check device according to claim 3, characterized in that: The vacuum breaking valve is located on one side of the air-permeable connecting pipe on the top wall of the check body.

5. The overflow pipe venting check device according to claim 1, characterized in that: A discharge hole is provided on the side of the bottom wall of the check body close to the outlet connecting pipe, a discharge seat ring is fixed on the outer side of the discharge hole, and a discharge plug is provided in the discharge seat ring.

6. The overflow pipe venting check device according to claim 5, characterized in that: An ear plate is fixed on one side of the discharge seat ring, and hanging rings are fixed on the ear plate and on the outer side wall of the discharge plug, and the two hanging rings are connected by a steel wire rope.

7. The overflow pipe venting check device according to claim 5, characterized in that: A discharge plug sealing gasket is provided between the discharge plug and the free end surface of the discharge seat ring.

8. The overflow pipe venting check device according to claim 1, characterized in that: Rubber bushings are provided on the inner side wall and the outer end surface of the air-permeable connecting pipe.

9. The overflow pipe venting check device according to claim 1, characterized in that: An inspection hole is provided on one side wall of the non-return body, and an inspection cover plate connected with the inspection cover plate through a plurality of bolts and nuts is provided outside the inspection hole.

10. The overflow pipe venting check device according to claim 9, characterized in that: A cover plate sealing ring is provided between the inspection cover plate and the outer side wall of the check body; and a gasket is provided between the nut and the inspection cover plate.

Images