JP3174374U - Swirl pump self-priming device and check vent valve - Google Patents

Abstract

[PROBLEMS] To take advantage of space-saving features in a combined form of a motor-integrated horizontal shaft centrifugal pump and a T-type check valve for direct bilge suction of a firefighting / bilge pump unit and emergency bilge suction of a cooling seawater pump. Provide a simple self-priming device.
SOLUTION: A mud box 10 with a check valve and a check vent valve 17 are arranged directly at the end of a bilge pipe 4, and the bilge pipe is filled and evacuated with a positive pressure under the water line, and a negative pressure at the time of suction. Will prevent the reverse inflow of the atmosphere and provide the self-priming function of this pump.The inlet end of the emergency bilge suction check valve is used as a suction port to limit the amount of residual air under the check valve body and make the transient charge of this pump constantly charged. Self-priming of air-fuel mixture without hindrance, non-returning air valve with floating and floating check valve body corresponding to the upper and lower valve seats, and non-returning to the suction system of the main engine lubricating oil pump unit A self-priming operation is made possible by providing a valve and maintaining the refueling state with the initial priming oil.
[Selection] Figure 1

Description

  The present invention mainly relates to a self-priming device for a centrifugal pump used in a seawater system of a ship, and can be applied to general land pump facilities.

  Generally, large and medium-diameter centrifugal pumps (hereinafter referred to as this pump) are used for seawater pumps for ship bilge and ballast systems and engine cooling systems. Since (Dry-run) does not have a self-priming function, a self-priming auxiliary mechanism such as a vacuum pump is added to the suction of bilge (Bilge) wastewater, etc., and ship-related regulations (Japan Maritime Association, etc.) It is the “self-priming type” of the request.

Fire engine and bilge pumps are applied to the bilge suction / drainage in engine rooms, holds, etc., and a self-priming assist (Priming) is provided by adding a friction clutch drive vacuum pump or compressed air drive ejector from the motor shaft. In the former, when the vacuum suction water reaches the inside of this pump and moves to the self-priming operation (Wet-run), the discharge pressure rises and the vacuum pump is automatically disconnected, and in the latter, the suction water reaches inside this pump. Compressed air is automatically stopped at the timer set at the required time or when the discharge pressure rises, and each pump is self-priming assisted. Large ships are equipped with eductors that are driven by the pump discharge water. Suction and drainage are performed.

  In addition, a centrifugal pump is also commercially available as a self-priming assist mechanism in which a priming tank is added to this pump, a suction port is arranged higher than the pump core, and a negative pressure is applied to the suction pipe.

The firefighting / bilge pump unit is composed of one firefighting / miscellaneous pump and one firefighting / bilge pump installed in parallel, but this pump and the valves around it also have the function of a redundant auxiliary unit with the same specifications.

In the main engine lubricating oil pump with a large bore, in small and medium sized ships, the gear pump mounted on the main engine (hereinafter referred to as “equipped with the machine”) and the spare electric gear pump constitute a dual auxiliary unit, and the pump itself Has a self-priming function from the sump tank (oil receiver) at the bottom of the main engine, but because of the low rotation speed (900rpm), the pump set protects the meshing sliding tooth surface of large and precision machining. A high-mesh primary strainer is required on the suction side, and in large ships, two tall vertical centrifugal pumps with oil impellers immersed under the oil level in the sump tank are arranged with discharge-side check valves. , Both occupy considerable installation space, especially the latter occupies a large space.

  The motor-integrated horizontal shaft centrifugal pumps of the prior invention “Japanese Patent Application No. 2009-165327” (hereinafter referred to as “Invention 1”) and “Japanese Patent Application 2011-48287” (hereinafter referred to as “Invention 2”) have a vertical surface around the pump. The valve unit can be operated and maintained from the end side of the pump shaft and can be operated and maintained with a simple structure and space-saving pump unit. An effective and simple self-priming assist function is desired.

  The fire fighting / bilge pump unit is equipped with an eductor as described in the previous invention 1 and has a unit configuration in combination with the T-type check valve of the “developed 3161757” (hereinafter referred to as the existing device 1). Although it can be simplified and the self-priming function can be integrated into the eductor, the direct bilge suction in the bilge suction / drainage system of the engine room is the emergency drainage function of this pump, similar to the emergency bilge suction of the cooling seawater pump. Direct self-priming is required.

As a hydraulic condition of this pump installed on the double bottom of the engine room, this pump always receives positive pressure of several meters or more under the waterline even in an empty cargo hold (Cargo Hold) or liquid tank (Cargo Tank). Focusing on driving at a negative pressure of several meters during bilge suction, the following measures are taken.

The main engine lubricating oil pump (hereinafter referred to as this pump, in addition to special notes) is advantageous in terms of system simplicity and space saving because a spiral pump that does not have a sliding part with a small size and high speed rotation is not required. The suction condition is such that the oil level of the sump tank is close to the double bottom upper plate, and the self-priming condition with the spiral pump is conceivable as in the above-described direct bilge suction and emergency bilge suction.

Means to solve the problem

  [Direct bilge system] A check valve for the direct bilge suction system is installed in a mud box (Mud Box: built-in filter plate) arranged in the bilge well (Bilge Well), and a slightly long suction pipe is applied to the pump suction port. Direct bilge pipe (hereinafter referred to as bilge pipe)

The bilge pipe is larger than the residual air volume from the bottom of the check valve including the mud box and tail pipe to the lowest water surface of the bilge reservoir, and the priming water suction is longer than this pump start time (generally about 1 second for direct injection start). The length of the pipe (approx. 2m or more) is suitable, and the middle is lowered and piped in a U-shape.

Attach a check vent valve to the suction part of the pump casing and the highest part of the bilge pipe (the end of the check valve side), open the intake valve of the pump, and put the bilge pipe inside the pump along the draft line. The water is filled while venting at positive pressure (venting air), and the vent valve is automatically closed when filling is completed.

  During operation of this pump for supplying high-pressure water for firefighting and eductor-driven water, the head loss of the intake system is small, and this pump pushes and sucks in with positive pressure under the draft line, so the positive pressure in the bilge pipe and the exhaust air are discharged. Keep valve body closed.

This pump should avoid anhydrous idling due to lubrication of the shaft seal (prevents sliding surface damage of the mechanical seal and maintains its life). During operation of the ship (voyage, cargo handling, berthing) (Deck / chain wash etc.), normal various bilge suction, and daily operation of eductor drive water supply in full load ballast residual water suction (Stripping), this pump and direct bilge pipe as well as various pipes on the discharge side Always filled with water.

In addition, the water in each pipe is renewed by daily operation of this pump, and the inside of each pipe is protected by the chemical solution of the marine organism adhesion prevention device (MGPS) installed in the sea chest (Sea Chest) in front of the intake valve. The

  [Action] Open the check valve attached to the mud box in the above-mentioned water filling state (the valve body is closed by gravity), close the intake valve, open the drain valve, and start this pump. Accelerates to generate sufficient negative pressure in the mudbox and tailpipe and sucks it up from the bilge reservoir.

  The priming water in the bilge pipe energized by this pump reaches the outside drainage via the drainage valve following the drainage pipe water on the discharge side of this pump, and the air mass in the mudbox and tail pipe passes through this pump after starting, The negative pressure in the bilge pipe continues due to the inertia of the priming water and the drainage pipe water accelerated at full speed by the final pump at the end of start-up, and the bilge reaches the pump and reaches steady suction and drainage.

  During the bilge suction, the check valve body of the above-described check vent valve works due to the negative pressure, thereby preventing the reverse flow of the atmosphere into the bilge pipe.

  [Check air release valve] The check air release valve has conical valve seats at the upper and lower ends of a vertically oriented cylinder, and a sphere smaller than the inner diameter of the cylinder and lighter than water is used as the valve body. The evacuation valve body and the check valve body are opposed to each other, and a baffle plate having a sphere diameter is secured between the spheres, and a sufficient fluid passage opening is provided on the outer periphery of the sphere to fix the cylinder in the middle of the upper and lower sides. Configure to have.

In addition, a thrust rod with a spring is placed on the top of the upper valve seat, and the upper valve body is pushed down to enable degassing check (air is incomplete when degassing is completed, water flows out when complete). Provide an evacuation tube.

  The lower end of the check vent valve is mounted directly (or via a cock) on the pump and bilge pipe.

  [Operation] When water is poured into the bilge pipe, the check valve body is pushed up and opened by the positive pressure under the water line, and the air passes through the outer periphery of the baffle plate and passes through the outer periphery of the exhaust valve body. It is discharged into the atmosphere through the exhaust pipe through

  When water rises in the upper part of the cylinder at the end of exhalation, the exhalation valve body rises, hits the upper valve seat, is pressed by positive pressure below the water line, and stops water. It falls into the bilge reservoir opening and the check valve body stays directly under the baffle plate.

  During bilge suction, the check valve body descends due to the negative suction pressure of this pump and is pressed against the lower valve seat to stop water.In the transition period, the vent valve body is pulled away from the upper valve seat. Prepare for venting when filling bilge pipes.

  In the above bilge suction operation, the check valve attached to the mud box was opened (valve body weight closed) and the pump was started. However, the intake valve and drain valve were opened and the pump was idled to close the intake valve. For example, the full-speed inertia of the water in the discharge side drain pipe of this pump is added, so that more reliable bilge suction can be obtained.

  The positive pressure below the water line is taken as an empty draft as the lowest water level and a full draft as the highest water level. The former (several meters) operates reliably, and the valve seat contact strength of the vent valve body is increased in the latter (around 10 m). Adequately, the negative pressure when sucking bilge is usually several meters, but considering the transient phenomenon of this pump when passing negative pressure air mass following priming water, the valve seat of the check valve body in vacuum (-10m) Design the contact strength sufficiently.

  [Alternative: Study required] As an alternative, the baffle plate is abolished and the vent valve is shared with the check valve, and the lower valve seat is slowly expanded in a curved manner to diffuse the air flow into the cylindrical section. It may be possible to reduce the air flow velocity under the valve body and avoid closing the upper valve seat when the valve body jumps up. From the rising situation of the charging water inflow rate during the intake valve opening operation, gusty concentration from the lower valve seat It is necessary to examine and confirm transient phenomena such as airflow.

  [Emergency Bilge System] The configuration of the self-priming device of this pump in the direct bilge suction / drainage of the fire fighting / bilge pump unit has been described above, but the emergency bilge system in the cooling seawater pump unit of the engine cooling device has a simpler self Can give a sucking function.

The cooling seawater pump unit is duplexed with 2 pumps (normal / spare) as important navigational devices on the voyage, and a normal intake valve and an emergency bilge suction check valve on the suction side of one (generally, spare) Normally, both the two pumps open the intake valve and the discharge check valve, operate one (normal machine), and the other (preliminary machine) prevents the reverse flow with the valve of the discharge check valve. Both pumps are always in a water-filled state so that they can be switched between normal use and standby only by electric operation, and the valve body of the emergency suction check valve is filled up.

  As with the above-described firefighting / bilge pumps, the cooling seawater pump is also provided with a check vent valve on the suction side of the pump, so that the water is completely charged during the operation of the ship.

  The emergency suction check valve has a suction port that is 100 mm higher than the double-bottom top plate in accordance with the relevant rules, and the residual air volume under the valve body is limited and the critical suction pipe length is shortened without adding a tail pipe. It is desirable to save space, and the handle of the check valve is installed at a height that is easy to open and close with the operation floor height in front of this pump (the casing cover on the pump shaft end side can be opened), and a class that requires 460 mm or more above the floor is required. Corresponding to handle shaft extension according to.

[Action] When the inundation reaches 100 mm or more on the double bottom upper plate due to an engine room accident or the like, if the emergency suction check valve is opened and the intake valve is closed, the water on the check valve body becomes the priming water and the reverse Effective suction negative pressure is generated through the residual air under the valve body of the stop valve, sucking up the launch in combination with the inertia of the cooling seawater on the discharge side of the pump, and the pump Through the accompanying transient phenomenon (already mixed with water), steady discharge is reached.

The volume of residual air under the check valve body is much smaller than the pump full volume of the pump (about 1/10), and the check valve body is opened by the suction negative pressure at the initial stage of starting the pump. Even if it precedes the inside, the air-water mixture ratio is small, and the self-priming function is maintained.

[System improvement] In order to avoid adverse effects on the engine cooling system (main engine and power generation engine) of this pump idling when the emergency suction / discharge water of accidents, etc. is contaminated with foreign matter or the inundation height falls below 100mm Although there is no request in the same way, in the same way as the direct bilge suction / drainage of the firefighting / bilge pump described above, an emergency drain valve and pipe are added to the discharge side of this pump and directly drained outside the tank, and the other one main pump It is considered necessary to continue supplying the engine cooling system with the steady cooling seawater via the intake valve.

[Lubricating oil system] Instead of the geared gear pump in medium and small ships and the vertical axis centrifugal pump in the impeller oil bath of large ships, a lubricating oil pump unit is configured with two horizontal axis centrifugal pumps. Uses a standard rotation speed of 1800 rpm (4-pole motor drive), and the discharge side is composed of an angle check valve and a T-type check valve. It is supplied to the rotating sliding part of the main engine through an oil cooler (equipped with a small-capacity engine).

Suction valves (butterfly valves) are arranged at the suction ports of the two main pumps (regular machine and spare machine), and the pipe end flange is arranged on the double bottom upper plate near the sump tank to directly adjust the main suction check valve. It is connected with a suction main pipe, and the tail pipe of the check valve is placed under the liquid level of the sump tank to localize the residual air under the valve body.

A small-diameter oil supply valve and a T-type check valve (passage passage between the two outlets) are arranged near the discharge port of this pump to form an oil supply valve assembly, and a nearby lubricating oil transfer pump or manual pump Lubricate the pipe to the initial priming, place a cock at the highest part of the discharge pipe, and guide the bleed pipe to the sump tank.

[Action] With the initial priming oil, both the two pumps (usual machine / spare machine) and the suction valve and the discharge check valve are opened to fill the initial priming oil so that operation and standby can be switched only by electrical operation. Use the main suction check valve to hold priming.

When this pump is started, the residual air under the valve body of the main suction check valve reaches the main pump through the suction main pipe, but this pump accelerates while passing through the main suction pipe as in the case of the direct bilge and emergency bilge mentioned above. Therefore, since the air / oil mixture ratio is small and the self-priming of the pump is not hindered, the gas-oil mixture is returned to the sump tank by operating the venting cock and the venting pipe. Has a sucking function.

After stopping the main pump when the main engine stops at the ship's port, the suction check valve keeps itself sucking (Priming Keep), and the viscosity of the oil suppresses the leakage of the valve body while calling at the port. Self-priming of time is also possible.

When this pump (for example, a regular machine) is opened due to internal inspection or replacement of the shaft seal, etc., switch to the other pump (for example, a spare machine) and keep the oil feed continued. Close and drain the oil, and after completion and recovery, open the suction valve and discharge check valve of this pump, refill the oil through the lubrication valve assembly from the other pump in operation, and electrically pump this pump Switch to the above operation and perform the above-described venting operation.

The effect by the structure of this invention described above is demonstrated below.

In the suction and drainage of the direct bilge of the fire fighting / bilge pump unit and the emergency bilge of the cooling seawater pump unit, the automatic venting of the check vent valve makes the filling of the pump and bilge pipe under the water line effective priming water. By switching to bilge suction during pump start-up or steady operation, the priming water is accelerated together with pipe water on the discharge side of this pump and has inertia, and this pump, bilge pipe and discharge pipe are effective as a whole pump unit In addition, it becomes a simple self-priming device and satisfies the “Self-Priming Type” specified in the relevant regulations (Japan Maritime Association, etc.).

  The check air release valve that controls the detection of water filling of the pump and the bilge pipe and the backflow prevention at the time of bilge suction is a double spherical shape (or a valve seat and a spherical air release valve body and check valve body at the upper and lower ends of the cylinder) It is a small and simple structure with a single sphere with both valve bodies as a common sphere, and it is attached to the suction side of this pump. It operates with a negative pressure of several meters, with a low pressure strength, high operational reliability and high durability, and a fully-closed structure of the horizontal twin-swivel pump with integrated double suction port of the inventions 1 and 2 And the T-type check valve of the first device can be applied to a space-saving pump unit configuration.

  In the main engine lubricating oil pump unit, the self-priming function by the initial nominal oil can be used, so that a small-sized horizontal axis centrifugal pump can be used, and the primary strainer is not required for the gear pumps of small and medium-sized ships. The installation space such as the oil bath vertical axis pump of a large ship is no longer required, and the engine room can be shortened. Since this pump fits under the passage floor, a secondary strainer and a lubricating oil cooler (equipped with a small ship) are installed on the floor. Thus, a three-dimensional composite unit can be configured to effectively use the engine room space.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure of the fire fighting and bilge pump unit which shows the structure of the direct bilge type | system | group of this invention, (a) is a top view, (b) is the front view which extracts and shows this bilge type | system | group. The sectional side view which shows the structure of the non-return air extraction valve of this invention. The front view of the cooling seawater pump unit which shows the structure of the critical bilge system of this invention. Front view of the main engine lubricating oil pump unit showing the configuration of the lubricating oil suction system of the present invention

Mode for carrying out the present invention

  As described above, the self-priming device in which the self-priming function is given to the pump by constantly filling the suction side of the pump and the bilge pipe with a positive pressure below the water line and giving the self-priming function to the pump in the pump unit configuration as described above. Direct bilge suction / drainage system as example 2, bilge pipe check vent valve as example 2, critical bilge suction / drainage system as cooling seawater pump unit as example 3, and main engine lubricating oil pump unit as example 4 The suction system will be described with reference to the drawings.

  [System configuration] In FIG. 1, if the direct bilge suction / drainage system of the present invention is shown, FIG. 1 (a) shows the plan view of the suction system of the fire fighting / bilge pump unit, and FIG. 1 (b) shows the direct bilge The front view of the pipe (A-A arrow view) is extracted and illustrated (however, the valves on the discharge side of this pump, that is, the fire-fighting water, the eductor drive water, and the check valve for drainage outside the water form a general pipe system) The illustration is omitted).

  The outward suction ports 2 of the two main pumps 1 are connected to a check valve V8 attached to a mud box 5 arranged in a bilge reservoir BW on both sides of the engine room through a T branch pipe 3 and a direct bilge pipe 4, respectively. Connected to form a direct bilge suction system. On the port side, the pump 1, T branch pipe 3, direct bilge pipe 4 below the mud box 5, tail pipe 6 and check valve V8 under the check valve V8 And the valve body of the check valve V8 is shown by a solid line slanted line.

On the starboard side, a T-branch pipe 3 is arranged at the outward suction port 2 of the pump 1, and the direct bilge pipe 4 (shown by a chain line) is omitted in place of an emergency bilge suction system of a cooling seawater pump unit, which will be described later. Alternatively, it can be added as needed on the port side as necessary for the ship, and is not shown.

  The T branch pipe 3 arranged in the outward suction port 2 of the pump 1 is connected to the intake main pipe 7 shared with the cooling seawater pump via the intake valve V1A. Take the seawater from the seawater box through the common intensive strainer and intake valve.

  The T branch pipe 3 is connected to the bilge main pipe 8 passing under the pump 1 via the valve V1B (electric motor abutment), and the common bilge main pipe 9 in the engine room is arranged via the port side valve V9. Like the small-diameter check valve mud box 10 installed on the BW, it reaches various bilge reservoirs and mud boxes with a bilge suction check valve at the bottom of the ship, and via the starboard side valve V10, the ship bilge main pipe 11 is arranged and the hold. And the bottom bilge suction system at the bow.

  Valve V1C is arranged at the suction port 2 on the opposite side of both pumps 1 and connected to the ballast main pipe and the sewage pipe 13 of the stern tank via the T-branch pipe 12 to absorb the remaining water of the ballast drainage when the ship is fully loaded (Stripping) And a self-priming system for ballast pumps.

  The drainage pipe 13 is connected to the check valve V13, the bilge main pipe 6 is connected to the suction port on the side of the eductor 14 in the form of a coupled valve through the T-shaped check valve V14 (double outlet 90 degree direction type), and It connects to the lower drive water port through the following check valve V12, and is stored between the two main pumps 1.

  On the discharge port 15 of the pump 1, an inverted L-shaped multi-branch pipe 16 is erected, and check valves V11, V12, and V4 are disposed for fire fighting water, eductor driving water, and outside drainage water, respectively ( (The illustration is omitted for the standard system configuration of a firefighting / bilge pump unit).

  A non-returning air release valve 17 is mounted on the casing suction part of the pump 1 and the highest part of the bilge pipe 4 respectively, and normal chain cleaning with fire-fighting high-pressure water during operation of the ship and various bilge suctions with the eductor 14 are performed. In the operation of the main pump 1, the intake valve V1A is opened, the main pump 1 and the bilge pipe 4 are filled with a positive pressure H [m: positive head height] below the water line, and the check vent valve 17 is evacuated. The discharge water of the pump 1 is filled with the positive pressure H or the discharge pressure.

[Action] The intake valve V1A is closed, the outside drainage check valve (hereinafter referred to as drain valve) V4 and the bilge check valve V8 are opened directly (the valve body is closed at positive pressure H), and the pump 1 is started. Then, the water on the valve body of the main pump 1, the direct bilge pipe 4 and the check valve V8 (shown by the hatched line) becomes the priming water, and the mud box 5 and the tail pipe 6 below the valve body of the check valve V8. Negative pressure is applied to the residual air (shown by the dotted line), the check valve body of the check air release valve 17 is closed to prevent backflow in the atmosphere, sucked up from the bilge reservoir BW, priming water and discharge water (multi-branch) The pump 1 is started before the priming water passes directly through the bilge pipe 4 and the normal rotation speed is reached, and the priming water and the discharge water reach full speed. Residual air, etc. passes through the pump 1 transiently and directly leads to steady operation of bilge suction and drainage, and the relevant rules require To satisfy the "self-priming type" of the pump 1 as a pump unit.

If the intake valve V1A and the drainage valve V4 are opened and the pump 1 is idled for water intake / drainage, and the intake valve V1A is closed in a steady operation state, the full-speed inertia of the discharged water in the long pipeline is passed through the air mass. Since the transient time of the pump 1 is limited and bilge suction is performed, the bilge pipe 4 may be short.

The common bilge, Funakura bilge, and ballast residual water suction / drainage are concentrated in the pump water supply eductor 14 by this pump 1, but the check valve V13 is opened and the eductor is self-priming and the valve V1B is opened for suction. The water level can be guided to the main pump 1 as priming water, and most of the ballast residual water can be sucked and drained by the main pump 1 having a higher flow rate than the eductor 14.

  [Configuration] In FIG. 2, hardware 104 and 105 having conical valve seats 102 and 103 are arranged on the upper and lower ends of the cylinder 101, and the lower hardware 105 is attached to the mounting seat 106 disposed on the pump 1 and the bilge pipe 4 directly. Attached by screwing (or flange), a spring-loaded push rod 107 and an inverted L-shaped evacuation tube 108 are added to the upper hardware 104.

Two spheres (material: polypropylene, etc.) that are lighter than water are inserted into the cylinder 101 corresponding to the valve seats 102 and 103 at the upper and lower ends, and the vent valve 109 and the check valve 110 are opened. A baffle plate 111 having 112 is arranged in the middle of the cylinder 101 to constitute a check vent valve 17.

  The clearance between the inner surface of the cylinder 101 and the valve bodies 109 and 110 is equal to the peripheral opening 112 of the baffle plate 111 and has a cross-sectional area that exceeds the diameter of the fluid inlets and outlets 113 and 114 of the valve seats 102 and 103. Give enough.

  The baffle plate 111 is provided with an indentation or a three-point protrusion so that the valve bodies 109 and 110 are seated on the axis of the cylinder 101. In the case of the indentation, a fluid retention preventing groove is added, and the protrusions are provided at three positions of the peripheral opening 112. 115 is fixed to the cylinder 101 (plug welding or the like).

  [Operation] When the bilge pipe 4 is filled with water, the air flowing in from the inlet 114 of the lower valve seat 103 blows up the check valve body 110 but is held by the baffle plate 111, and the air passing through the peripheral opening 112 is vented. It passes through the periphery of the valve body 109 and is discharged into the atmosphere through the outlet 113 of the upper valve seat 102 and the exhaust pipe 108.

  When air is replaced by water at the end of the exhalation and the water level in the cylinder 101 rises, the exhalation valve body 109 comes into contact with the valve seat 102 by buoyancy and is pressed by the positive pressure H below the water line to stop the water. The jet water is discharged through the exhaust pipe 108 and falls into the bilge reservoir BW, and the check valve body 110 stays directly under the baffle plate 111 by its buoyancy.

  When the bilge pipe 4 becomes negative pressure due to bilge suction, the check valve body 110 immediately descends and is sucked by the valve seat 103 to stop water and prevent reverse inflow of air from the outlet 113 of the upper valve seat 102. As the check valve body 110 is lowered, the vent valve body 109 is forcibly separated to prepare for the next venting operation.

When the upper end of the push rod 107 is pushed with a finger during positive pressure filling of the bilge pipe 4, the vent valve 109 is pushed down to bring out an evacuated state (water is ejected from the evacuation pipe 108 when the evacuation is completed, and air is ejected when it is not completed) Can be confirmed.

  [System Configuration] In a cooling seawater pump unit configured by parallel installation of two main pumps 1 shown in FIG. 3, a water intake valve V1 is arranged at the opposite suction port 2 of the main pump 1, and a T branch pipe 23 and an intake pipe are arranged. The water pipe 24 joins the temperature control pipe (not shown) and is connected to the water intake main pipe 7 (not shown) shared with the fire fighting / bilge pump unit described above, and has a handle-free T-type check valve (double outlet 180). Water) to the main cooling system (lubricant oil cooler and air cooler) via the discharge valve V2, the T merging pipe 25 and the water supply pipe 26 arranged at the opposite side outlet 22 of the normal shape) 21. Cooling seawater is supplied to the sub-cooling system (fresh water cooler 28) from the pipe 26 via the branched water supply pipe 27 and the valve V3.

  The inlet 30 of the emergency bilge suction check valve V1E is connected to the outward suction port 2 of the starboard side pump 1 (hereinafter referred to as “Unit 1” as needed) through the suction pipe 29 in accordance with the related rules. Installed at 100mm height above heavy bottom top plate TTP

The emergency suction check valve V1E is required to be “installed at an easy-to-operate height” according to the relevant rules. The handle height on the operation floor OFL of the pump 1 is sufficient for the function, but the classification requires 460 mm or more. There is an association, in which case it will be handled by an extended handle shaft.

  A T-branch pipe and two valves V1S and V1C are arranged in the outward suction port 2 of the port-side main pump 1 (hereinafter referred to as “Unit 2” as needed). The former is the fire fighting / bilge pump unit described above. Connected to a common intake main pipe 7 (not shown), the latter connected to a ballast main pipe (not shown), a valve V2C is arranged at the outward outlet 22 of the T-type check valve 21, and a pipe 33 on the middle deck MDK Connect to a ballast water treatment device (not shown).

  In both Unit 1 and Unit 2 of this pump, the intake valve V1 and the discharge valve V2 are opened, one of the pumps (for example, Unit 1) is operated to supply cooling seawater to the main / sub cooling system, and the other (for example, 2) Since both pumps 1 are in stand-by mode, the suction part of the casing of both pumps 1 is charged with positive pressure H under the water line together with the intake pipe 24, and the discharge side is charged with discharge pressure together with the primary and secondary cooling systems. (Water supply).

  [Operation] If the accidental flooding in the engine room reaches 100 mm or more on the double bottom upper plate TTP, and the check valve V1E is opened and the intake valve V1 is closed, the valve body of the check valve V1E (self-weight) by the suction force of the pump 1 (Closed) opens and residual air (shown by the dotted line) rises up the suction pipe 29 (shown by the solid line) to cause the pump 1 to mix air and water, but the residual air volume is about 10% of the full water in the pump 1 The inertia due to the flow rate on the discharge side is added without impairing the self-priming function of the pump, and the water is sucked in. The pump 1 reaches the steady suction / supply operation through the transition period of the air-water mixing.

  [Problems and countermeasures of customary systems] In the emergency bilge suction, the discharge side of the pump 1 remains the main / sub cooling system, the suction of residual air mass and foreign matter under the valve body of the check valve V1E, and emergency drainage In order to avoid an adverse effect on the cooling system due to air suction due to advancing and lowering of the water level, there is no provision in the related rules. The drainage pipe 31 is arranged and connected to the outside drainage pipe 32, and the pump 1 is switched to Unit 2 to start steady supply of cooling seawater to the cooling system. Drain the water.

  When the main pump 1 of the first unit and the check valve V1E and the drain valve V2E on the outward side of the T-type check valve 21 are opened and the pump is started, the valve body of the check valve V1E is opened by the negative pressure accompanying the start-up progress. Residual air underneath (shown with dotted lines) reaches the pump 1 through the suction pipe 29, reaches a steady rotational speed through transient air-water mixing, and reaches the steady rotation speed and the water in the pipe of the drain pipe 31 (shown with solid lines). Is accelerated to full speed, leading to steady suction and drainage.

  [Related mechanism] Switch to the Unit 2 ballast water circulation process at the beginning of the voyage after unloading. If the engine room is inundated during use, switch to a backup ballast pump if necessary, or stop the circulation process. Then, this pump No. 2 is replaced with cooling seawater supply by valve switching operation, and the emergency bilge suction / drainage is performed at No. 1 unit.

  Unit 2 is a ballast water circulation treatment system. Forepeak tank and stern tank (Aft-peak tank) can be filled with treated water instead of circulation treatment at the time of unloading due to their tank volume and structure. Therefore, suction switching valves V1S and V1C are provided (reference description).

  [System Configuration] In FIG. 4, if the main part of the main engine lubricating oil pump unit is shown, the suction main pipe 41 passes through the suction valves V1 respectively disposed in the suction ports 2 of the two main pumps 1 (the regular machine and the spare machine). Is connected to a main suction check valve V1M disposed at a low position as mounted on the welded flange 42 on the double bottom upper plate TTP, and its tail pipe 43 has a suction port 45 disposed below the oil level of the sump tank 44, The suction main pipe 41 has a sufficient pipe length for passage of the oil at the start of the pump 1 and forms a lubricating oil suction system.

  A T-type check valve V2T is arranged on one side (ordinary machine) and a check valve V2 is arranged on the other (preliminary machine) at the discharge port 15 of the pump 1, and the opposite outlet is connected by a short pipe 46. The discharge pipe 47 arranged at the outlet on the outward side leads to the secondary strainer 48, and further passes through a lubricating oil cooler 49 (piping is not shown) to reach the rotational sliding portion of the main engine (not shown) via the oil feeding pipe 50. Forms an oil discharge system.

  A small-diameter lubrication valve V3 and a T-type check valve V3T are arranged near each discharge port of the pump 1 to form a coupled lubrication valve assembly and connected to the nominal oil pipe 52, and the lubricating oil installed in the vicinity. An initial pump oil is sucked from the sump tank 44 by a transfer pump or a manual pump (both not shown), and the suction main pipe 41 and the main pump 1 are filled.

  The cock 52 is disposed at the highest part of the pipeline such as the discharge pipe 47 and the gas / oil mixture is returned to the sump tank 44 through the vent pipe 53.

  [Operation] As the initial filling, if the suction valve V1 and the check valves V2 and V2T of both pumps 1 are opened, and the initial priming oil is injected through the priming pipe 52 through the lubrication valve sets V3T and V3, the main suction check valve Backflow oil is prevented by V1M, and both pumps 1 are filled. Further, a check valve V2, a short pipe 46, a T-type check valve V2T, a discharge pipe 47, a secondary strainer 48, and a lubricating oil cooler 49 The oil supply pipe 50 is filled with oil (with a small capacity main engine).

  During initial filling, the cock 51 of the lubricating oil discharge system such as the discharge pipe 47 is operated to evacuate, and the gas / oil mixture is dropped into the sump tank 44 through the bleed pipe 53 to remove the remaining air in the suction / discharge system. .

  When one of the main pumps 1 (ordinary machine) is started, the suction / discharge system refueling (solid hatched lines) is accelerated, and the residual air (dotted hatched lines) below the main suction check valve V1M and the tail pipe 43. (Shown) passes through the suction main pipe 41, the pump 1 shifts to a steady operation, and a normal self-priming operation is achieved through a transient state of gas-oil mixing.

  The cock 51 is operated again, and the rising residual air is discharged to the discharge system by starting the pump 1, and the pump unit is brought to an airless steady operation. The oil level of the sump tank 44 and the valve of the main suction check valve V1M Since the height difference HP with the body is small, this pump 1 performs self-priming operation with a slight suction negative pressure.

  When the main engine is stopped at the berth of the ship, etc., even when the pump 1 is stopped, the valve of the main suction check valve V1M prevents backflow and holds the oil. When leaving the port, the pump 1 is restarted. Immediately, the self-priming operation is started. When the berth is stopped, the main suction check valve V1M can be closed to hold the oil for a long time.

  When checking the inside of the pump 1 (for example, a regular machine) or replacing the shaft seal, the suction valve V1 and the discharge check valve V2T of the pump are closed, disconnected from the suction / discharge system, and opened. Switch to (for example, a spare machine) and continue operation and oil supply. After completion of recovery, the suction valve V1 and discharge valve V2T of the pump 1 are opened (the check valve body is closed with pressure oil). Open the valve V3, fill the discharge port 15 of the pump 1 with a standard cock while filling up the gas, start the pump 1, open the discharge valve V2T as soon as the evacuation is complete, and open the residual air under the valve body. Is vented by the cock 51 arranged at the highest part of the discharge system, the other pump 1 is stopped, and the main pump 1 shifts to regular oil feeding.

Industrial applicability

  The self-priming devices related to the direct bilge pipe of the firefighting / bilge pump unit and the emergency bilge suction valve of the cooling seawater pump unit described above are all of the horizontal-shaft centrifugal pumps with electric motor-integrated twin suction ports of the first invention and the second invention. The closed-type pump set and the coupled valve mechanism of the T-type check valve of the previous device 1 drastically reduce the number of parts, and the valves can be operated and maintained from the end of the pump shaft by concentrating the valves on the vertical surface around the pump. In a simple pump unit configuration, instead of the conventional vacuum pump and its operation mechanism, a self-priming function that is effective for directly filling the bilge pipe with a simple structure with a simple check vent valve is provided. The inlet is a suction port, the air-water mixing ratio of this pump is limited to provide an effective self-priming function, and a highly reliable and low-cost self-priming device is implemented as a pump unit. Holding Also applicable to self-priming device of the land general.

  Also in the main engine lubricating oil pump unit, the functions of the suction systems of both the direct bilge and the emergency bilge described above can be applied together to form a self-priming device for a small-size and closed structure motor-integrated horizontal shaft centrifugal pump. .

1 Main pump 2 Suction port 3 T branch pipe 4 Direct bilge pipe 5 Mud box 6 Tail pipe 7 Intake main pipe 8 Bilge main pipe 9 Common bilge main pipe 10 Mud box with check valve 11 Hunakura bilge main pipe 12 T branch pipe 13 Inlet / drain pipe 14 Eductor 15 Discharge port 16 Multi-branch pipe 17 Check air release valve 18 to 20 Missing number 21 T-type check valve (no handle) 22 Outlet 23 T branch pipe 24 Intake pipe 25 T Junction pipe 26 Water supply pipe 27 Water supply pipe 28 Fresh water cooling 29 Suction pipe 30 Valve inlet 31 Drain pipe 32 Outside drain pipe 33 Circulating water feed pipe 34-40 Abbreviated number 41 Suction main pipe 42 Flange 43 Tail pipe 44 Sump tank 45 Suction port 46 Short pipe 47 Discharge pipe 48 Secondary strainer (lubricating oil)
49 Lubricating oil cooler 50 Oil feeding pipe 51 Cock 52 Nominal oil pipe 53 Bleeding pipe 101 Cylinder 102, 103 Valve seat 104, 105 Hardware 106 Mounting seat 107 Push rod with spring 108 Bleeding pipe 109 Bleeding valve body 110 Check valve body 111 Baffle Plate 112 Opening 113 Fluid outlet 114 Fluid inlet 115 Protrusion
V1A Water intake valve V1B Bilge suction valve V1E Critical suction valve (check valve) V2E Emergency drain valve V1M Main suction check valve V1 Water intake valve, suction valve
V2 Main water supply valve, discharge check valve V2T Discharge check valve V1C Residual water suction valve, suction switching valve V1S Suction switching valve V2C Circulation discharge valve V3 Sub-water supply valve, oil supply valve V4 Drain valve (check valve) V3T Oil supply valve ( T type check valve)
V8 Direct bilge valve (check valve) V9 Common bilge valve V10 Funakura bilge valve V11 Fire fighting valve (check valve)
V12 Drive water valve (check valve) V13 Residual water suction valve (check valve)
V14 Bilge suction valve (T-type check valve)
TTP Double bottom upper plate BW Bilge reservoir OFL Operation floor LWL Water line SP Hull outer plate BHD Bulkhead MDK Middle deck

An emergency bilge suction check valve (hereinafter referred to as an emergency suction check valve) does not have a tail pipe, and the inlet end of the check valve is below the surface of the emergency bilge, that is, from the double bottom plate according to the relevant rules. 100mm high , the residual air volume under the valve body of the check valve is limited, and the length of the emergency suction pipe (referred to as the above-mentioned direct bilge pipe is called the emergency bilge pipe) is shortened in space saving of the pump unit Desirably, the handle of the check valve is installed at a height that is easy to open and close in front of the pump (possible to open the casing cover on the pump shaft end side), and it can be used as needed depending on the ship class that requires 460 mm or more above the floor. Corresponding with shaft extension

      The firefighting / bilge pump unit is equipped with an eductor as described in the Invention 1 and is coupled with the T-type check valve of the “Invention 3161757” (hereinafter referred to as the “Invention 1”). Although it can be simplified and the self-priming function can be integrated into the eductor, the bilge suction / drainage system direct bilge in the engine room (direct suction with a bilge pipe dedicated to the bilge reservoir) is an emergency of the cooling seawater pump unit Along with bilge (accident inundation), the pump (* Note) itself requires a suction / drainage function as an emergency bilge without relying on a self-priming assist mechanism such as an eductor (* Note: Item 0002: Spiral pump) This is called a pump, and is distinguished from a self-priming vacuum pump).

    [Direct bilge system] As an emergency bilge suction / drainage mechanism by the pump itself, such as a direct bilge system of a firefighting / bilge pump unit, through a check valve at the end of a slightly long bilge pipe attached to the suction port of the pump Connected to a mud box (built-in filter plate) and used as a priming pipe.

      [Emergency Bilge System] Similar to the direct bilge system of the firefighting / bilge pump unit described above, the emergency bilge suction / drainage mechanism of this pump itself is also used in the emergency bilge system of the cooling seawater pump unit. A simple self-priming function is provided by a check valve located at the end of a slightly longer bilge pipe.

        The check valve for the emergency bilge suction does not add a tail pipe, and the inlet end of the check valve is placed below the water surface of the emergency bilge, that is, 100 mm higher than the double bottom upper plate according to the related rules. Residual air volume under the valve body is limited, and the bilge pipe is filled with a priming function to form an emergency bilge suction / drainage mechanism. The handle of the check valve is in front of the pump (on the pump shaft end side). Install the casing cover at a height that is easy to open and close with a floor height that can be opened and closed. Handle class shafts that require a height of 460 mm or more above the floor, etc.

        In the emergency bilge suction / drainage mechanism of this pump itself, such as the direct bilge of the firefighting / bilge pump unit and the critical bilge of the cooling seawater pump unit, the automatic evacuation of both check bleed valves and the residual under the latter check valve Due to the locality of the air, filling of the pump and bilge pipe under the water line becomes effective priming water, and the priming water is accelerated together with the pipe water on the pump discharge side by switching to bilge suction during the start of the pump or steady operation, With this inertia, the pump, bilge pipe and discharge pipe that pass through the transient idling of the pump due to the residual air under the mud box and check valve body and the air-water mixing state instantaneously and reach steady suction. The pump unit as a whole is an effective and simple self-priming device and satisfies the “Self-Priming Type” specified in the relevant regulations (Japan Maritime Association, etc.).

        The effect by the structure of this invention described above is demonstrated below.

        In the emergency bilge suction / drainage mechanism of this pump itself, such as the direct bilge of the firefighting / bilge pump unit and the critical bilge of the cooling seawater pump unit, the automatic evacuation of both check bleed valves and the residual under the latter check valve Due to the locality of the air, filling of the main pump and the bilge pipe under the water line becomes effective priming water, and the priming water is accelerated together with the pipe water on the pump discharge side by switching to bilge suction during the start of this pump or steady operation. The pump, the bilge line and the discharge line that have inertia and pass through the transient idling of the pump due to residual air under the mud box and check valve body and the air / water mixing state instantaneously to reach the steady suction state. The pump unit as a whole is an effective and simple self-priming device and satisfies the “Self-Priming Type” specified in the relevant regulations (Japan Maritime Association, etc.).

Claims (4)

  In a firefighting / bilge pump unit, a check valve is placed directly on the end of the bilge pipe and attached to the mud box on the bilge reservoir, and a check vent valve is attached to the casing suction part of the pump and the highest part of the bilge pipe. A self-priming device for a vortex pump configured to fill and bleed the bilge pipe with a positive pressure below the water line and prevent reverse flow of the atmosphere with a negative pressure during suction of the bilge of the pump, and as a priming function of the pump .   In the cooling seawater pump unit, the inlet end of the emergency bilge suction check valve is installed 100 mm high above the double bottom upper plate to limit the residual air under the check valve body, and constantly charged with positive pressure below the water line. A self-priming device for a centrifugal pump configured so as not to interfere with the transient air-water mixing self-priming by the residual air of the present pump.   Conical valve seats are arranged on the upper and lower ends of the cylinder in the vertical position, baffle plates having an outer peripheral opening in the middle, and two floating bodies are arranged in the cylinder corresponding to the upper and lower valve seats respectively. The check vent valve according to claim 1, configured as a gas valve body and a check valve body. In the suction system of the main engine lubricating oil pump unit, the main suction check valve connected to the suction main pipe of this pump and directly attached to the double bottom upper plate and the suction port under the oil level of the sump tank in the double bottom A check valve tail pipe is provided, an oil supply valve is provided near the discharge port of this pump, and an oil supply pipe by a nearby lubricating oil transfer pump or a manual pump is connected to give this pump an initial priming oil. In addition, the self-priming operation of the centrifugal pump is configured so that the self-priming operation is performed with a light negative suction pressure, the oil-filled state is maintained with the check valve even when the pump is stopped, and the self-priming operation can be performed immediately upon restarting the pump. apparatus.