JP2014025353A - Oil feed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED To prevent corrosion of a barrel, a trace pipe and the like by preventing rainwater from entering the inside of a pit.
A fuel injection pump 1 for boosting fuel oil and sending it to a combustion chamber, which is provided in a pump body 2 housed in a pothole 32 provided in the ground, and a ground portion 30. A suction port 11 for sucking the fuel oil into the pump body 2, and a discharge port 13 provided on the ground and for discharging the fuel oil whose pressure has been increased inside the pump body 2 from the pump body 2, An oil drain pipe 15 for draining the fuel oil from the inside of the pump body 2 is connected to the upstream side of the discharge port 13.
[Selection] Figure 1

Description

  The present invention relates to an eruption pump, and more particularly to an eruption pump effective for feeding light oil to a boiler as fuel oil.

  In a thermal power plant or the like, light oil having high volatility (low viscosity) and low sulfur content is used as fuel oil for a boiler. Light oil is stored in a fuel tank, and after being pressurized from the fuel tank to a predetermined pressure by a fuel injection pump, it is sent to a combustion chamber of a boiler.

  An example of this type of fuel injection pump is described in Patent Document 1. As shown in FIG. 2, this eruption pump 41 is a saddle type eruption pump, and is provided in the ground in order to secure the necessary suction pressure by the head pressure and to facilitate degassing. The pump main body 42 is accommodated in the pit 72.

  A cylindrical stainless steel protective tube 74 whose lower end is closed via a bottom plate 73 is provided inside the pit hole 72, and the pump body 41 is provided inside the protective tube 74, so that the inside of the pit hole 72 is provided. The exuded groundwater is prevented from entering the inside of the protective tube 74.

  The pump main body 42 includes a cylindrical barrel 43 whose upper and lower ends are closed, a multistage impeller 47 that is rotatably provided inside the barrel 43, a rotary shaft 48 that rotatably supports the multistage impeller 47, It is composed of a suction port 51 for sucking light oil inside and a discharge port 53 for discharging light oil from the inside of the barrel 43, and a rotation shaft of a motor 60 provided on the ground portion 70 on a rotation shaft 48 of the pump body 42. 61 is connected via a shaft coupling 56.

  Around the barrel 43, the trace tube 62 is spirally wound at a predetermined pitch so as to extend over the entire length of the barrel 43, and steam is circulated inside the trace tube 62 to heat the barrel 43. The inside of the barrel 43 can be kept at a predetermined temperature, and it can be prevented that the viscosity of the light oil becomes high and difficult to flow inside the barrel 43 at a low temperature in winter.

  A drain hole 45 penetrating the inside and outside of the barrel 43 is provided at the bottom of the barrel 43, and a drain pipe 75 for draining oil is provided between the drain hole 45 and the ground portion 70. At the time of inspection or the like, light oil inside the barrel 43 is drained from the ground portion 70 through the drain pipe 75.

  Between the bottom of the dredging hole 72 and the ground part 70, a draining pipe 66 is provided for draining water such as rainwater accumulated in the dredging hole 72, and the dredging hole 66 is provided via the draining pipe 66. By removing the water accumulated in 72, the barrel 43 is prevented from corroding.

  The ground portion 70 is provided with an oil breakwater 67 having a predetermined height so as to surround the periphery of the eruption pump 41, and when the light oil is drawn from the inside of the barrel 43 through the drain pipe 75 by the oil breakwater 67. In addition, the light oil that has flowed out to the surroundings is prevented from diffusing to the region outside the oil breakwater 67, and rainwater or the like is prevented from entering the eruption pump 41 side beyond the oil breakwater 67. .

JP 2011-644687 A

  By the way, in the eruption pump 41 having the above-described configuration, the ground portion 70 of the ground portion 70 is deteriorated and cracked due to secular change, or the ground portion 70 of the trace pipe 62 and the drain pipe 75 is formed. When the sealing member 68 sealing the through-hole 71a of the foundation 71 is deteriorated and the sealing performance is lowered, rainwater enters from the ground portion 70 into the protective tube 74 of the pothole 72. In addition, in the case of heavy rain, rainwater flows into the eruption pump 41 through the oil breakwater 67 installed on the ground portion 70, and a large amount of rainwater flows through the cracks and the like in the protective pipe 74 of the pit 72. Invade inside. For this reason, the rainwater accumulated inside the protective pipe 74 of the pothole 72 is drained through the draining pipe 66, but this is not enough, and the traced pipe 62, the drain pipe 75, the barrel 43, etc. are caused by the infiltrated rainwater. Corrosion may cause steam leakage or light oil leakage.

  The present invention has been made in view of the above-described conventional problems, and due to secular change, the foundation of the ground part deteriorates and cracks occur, or the through part of the foundation of the ground part of various pipes is sealed. Even if the sealing member deteriorates, rainwater does not enter the inside of the pit through them, and the intruded rainwater does not corrode the pump body and various pipes. It is an object of the present invention to provide a fuel injection pump that can completely prevent leakage.

In order to solve the above problems, the present invention employs the following means.
That is, the present invention is a eruption pump that boosts fuel oil and feeds it to a combustion chamber, and is provided in a pump body housed in a pothole provided in the ground, and on the ground part, A suction port that sucks the fuel oil into the pump body; and a discharge port that is provided on the ground and discharges the fuel oil that has been boosted inside the pump body from the pump body. An oil drain pipe for draining the fuel oil from the inside of the pump main body is connected to the upstream portion.

  According to the eruption pump of the present invention, the oil draining pipe for draining the fuel oil from the inside of the pump body is connected to the upstream portion of the discharge port provided in the ground part. Rainwater does not enter the inside of the pit through the connecting part, and the rainwater that has entered the inside of the pit does not corrode the pump body, etc., and neither steam leakage nor fuel oil leakage occurs. .

  Further, in the present invention, the pump body includes a cylindrical barrel whose upper and lower ends are closed, a multistage impeller provided rotatably inside the barrel, and a rotating shaft that rotatably supports the multistage impeller. An upper casing provided on the ground is attached to the upper part of the barrel, the suction port for sucking the fuel oil into the barrel and the fuel oil being discharged from the barrel. The discharge port may be provided, and the oil draining pipe may be connected to a portion of the upper casing on the upstream side of the discharge port.

  According to the fuel injection pump of the present invention, since the oil draining pipe is connected to the upper casing provided on the ground part, which is attached to the upper part of the barrel, the oil draining pipe is connected to the inside of the pit through the connecting part of the oil draining pipe. There is no infiltration of rainwater.

  Further, in the present invention, a trace pipe for circulating steam is wound around the barrel, and both ends of the trace pipe penetrate the inside of the upper casing and are drawn out to the ground part. It is good.

  According to the eruption pump of the present invention, both ends of the trace pipe penetrate the inside of the upper casing provided in the ground part from the inside of the pit and are drawn out to the ground part. Rainwater does not enter the inside of the pit.

  Further, in the present invention, a pair of U-shaped tubes may be provided in a penetrating portion of the trace tube of the upper casing, and both ends of the trace tube may be connected to the pair of U-shaped tubes.

  According to the fuel injection pump of the present invention, the trace pipe penetrating portion of the upper casing is provided with a pair of U-shaped tubes, and both ends of the trace tubes are connected to the pair of U-shaped tubes. By providing the U-shaped pipe in the reverse direction in the trace pipe penetrating portion of the upper casing, it is possible to prevent rainwater from entering the inside of the pit through the trail pipe penetrating portion.

  Furthermore, in the present invention, a film having a predetermined thickness may be provided on the surface of the barrel.

  According to the eruption pump of the present invention, even if water enters the inside of the pit and adheres to the surface of the barrel due to some cause, the surface of the barrel does not corrode.

  As described above, according to the eruption pump of the present invention, since rainwater does not enter the inside of the pothole in which the pump body is accommodated, the pump body and various pipes are corroded by rainwater. No leakage of fuel oil occurs, and the initial performance can be maintained for a long time.

It is sectional drawing which showed one Embodiment of the fuel injection pump by this invention. It is sectional drawing which showed an example of the conventional injection pump.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a fuel injection pump according to the present invention. The eruption pump 1 according to the present embodiment boosts light oil, which is used as fuel oil for boilers in boilers and the like, has high volatility (low viscosity) and low sulfur content from a fuel tank to a predetermined pressure. It is effective to send oil to the combustion chamber of the boiler after it has been made to occur.

The eruption pump 1 according to the present embodiment is a buried saddle-type eruption pump, and includes a pump body 2 housed in a pit hole 32 provided in the ground, and a motor 30 provided in the ground portion 30. And a shaft coupling 16 that connects the motor 20 and the pump body 2 to each other.
The reason why the pump body 2 is accommodated in the pit hole 32 is to secure the necessary suction pressure by the head pressure and facilitate the degassing.

  The pump main body 2 supports a cylindrical barrel 3 with the upper and lower ends closed inside the pit hole 32, a multistage impeller 7 provided rotatably inside the barrel 3, and the multistage impeller 7 rotatably. And a rotating shaft 8.

  An upper casing 10 provided on the ground portion 30 is attached to an upper portion of the barrel 3 of the pump body 2, a suction port 11 for sucking light oil into the barrel 3 into the upper casing 10, and light oil from the interior of the barrel 3. And a discharge port 13 for discharging the water.

  Flange 12 and 14 are provided at the opening peripheral edge of the suction port 11 of the upper casing 10 and the opening peripheral edge of the discharge port 13, respectively, and the suction port 11 and the discharge port 13 are respectively connected via these flanges 12 and 14. An oil feed pipe 29 is connected, the suction port 11 is connected to the fuel tank through these oil feed pipes 29, and the discharge port 13 is connected to the combustion chamber of the boiler.

  A wall-like trace tube support portion 10a projecting downward is integrally provided on the inner portion of the flange 12 of the upper casing 10, and the lower end of the trace tube support portion 10a is formed on the upper surface of the flange 4 of the barrel 3 described later. It comes to contact.

  A flange 4 projecting annularly outwardly is integrally provided at the upper end of the barrel 3, and the barrel 3 is supported by the opening peripheral edge of the pothole 32 through the flange 4, and the upper end opening of the pothole 32. Is blocked.

  The shaft coupling 16 includes a casing 17 provided in the upper part of the middle casing 10 of the pump body 2, a bearing portion 18 that is provided inside the casing 17, and rotatably supports the rotary shaft 8 of the pump body 2, and the casing 17. And a joint portion 19 that connects the rotary shaft 8 of the pump body 2 and the rotary shaft 21 of the motor 20 provided on the upper portion of the casing 17.

  Around the barrel 3 of the pump body 2, the trace tube 22 is spirally wound at a predetermined pitch so as to extend over the entire length of the barrel 3, and both ends of the trace tube 22 penetrate the flange 4 of the barrel 3. Pulled out to the ground part 30, the tip provided so as to penetrate the trace pipe support part 10 a of the upper casing 10 and the flange 12 on the suction port 11 side is connected to the downward U-shaped pipes 23 and 24. The U-shaped tubes 23 and 24 are connected to a steam supply source via a steam pipe 25.

  By supplying steam from the steam supply source to the inside of the trace pipe 22 and circulating the steam inside the trace pipe 22, the barrel 3 can be heated. Thereby, since the inside of the barrel 3 can be kept at a predetermined temperature, it can be prevented that the viscosity of the light oil becomes high and difficult to flow inside the barrel 3 at a low temperature in winter.

  In the present embodiment, the drain pipe 75 (see FIG. 2) for draining the oil provided between the drain hole 45 penetrating the bottom of the barrel 3 and the ground portion 30 is removed, and the bottom of the barrel 3 is removed. The drain hole 45 is closed by the plug 6, the through-hole 71 a (see FIG. 2) of the foundation 71 of the ground portion 30 of the drain pipe 75 is closed, and the oil draining pipe 15 instead of the drain pipe is connected to the discharge port of the upper casing 10. 13 is connected to the upstream side.

  A coating 9 having a predetermined thickness is formed on the surface of the barrel 3, and the coating 9 prevents the surface of the barrel 3 from being corroded. The coating 9 is formed, for example, by spraying a metal material such as aluminum or zinc onto the surface of the barrel 3 to have a predetermined thickness. By coating the surface of the barrel 3 with this coating 9, the barrel The surface of 3 can be rustproofed and anticorrosive.

  Between the bottom of the pothole 32 and the ground part 30, a water draining pipe 26 is provided for draining water accumulated inside the pothole 32 for some reason.

  The ground portion 30 is provided with an oil breakwater 27 having a predetermined height so as to surround the periphery of the eruption pump 1, and the light oil from the inside of the barrel 3 through the oil draining pipe 15 is provided by the oil breakwater 27. Is removed, the light oil that has flowed out of the periphery of the eruption pump 1 is prevented from diffusing to the region outside the oil breaker 27, and rainwater or the like passes over the oil breaker 27 to the side of the eruption pump 1. Prevents intrusion.

  Then, by operating the fuel injection pump 1 of the present embodiment configured as described above, the light oil in the fuel tank is sucked into the barrel 3 through the oil feed pipe 29 and the suction port 11. After being pressurized inside, the oil is discharged to the oil feed pipe 29 through the discharge port 13 and is sent to the combustion chamber of the boiler through the oil feed pipe 29.

  Further, steam is supplied from the steam supply source to the trace pipe 22 via the steam pipe 25 and the U-shaped pipes 23 and 24, and the steam is circulated inside the trace pipe 22, thereby heating the barrel 3 and the barrel. 3 can be maintained at a predetermined temperature, and it can be prevented that the viscosity of the light oil becomes high inside the barrel 3 and becomes difficult to flow at low temperatures in winter.

  Further, when light oil is pulled out from the inside of the barrel 3 during periodic inspections, the upstream side of the discharge port 13 of the upper casing 10 via the oil draining pipe 15 is activated by operating the drain pump 15a. Therefore, the light oil accumulated inside the barrel 3 can be removed.

  Furthermore, when water accumulates in the inside of the well 32 for some reason, the water collected in the inside of the well 32 is drained to the ground part 30 through the draining pipe 26 by operating the drain pump 26a. be able to.

  In the eruption pump 1 of the present embodiment configured as described above, the oil removal pipe 15 of the oil discharge pump 15a on the upstream side of the discharge port 13 of the upper casing 10 provided in the ground portion 30 is provided. It is connected to the inside, the conventional drain pipe 75 (see FIG. 2) is removed, the drain hole 45 of the barrel 3 is closed by the plug 6, and the through-hole 71a of the foundation part 30 of the drain pipe (see FIG. 2) 2 is connected to the inside of the oil discharge pump 15a on the upstream side of the discharge port 13 of the upper casing 10, so that the drain pipe 75 of the conventional drain pipe 75 shown in FIG. Rain water does not enter the inside of the pit 32 through the penetration part 71a.

  Further, both ends of the trace pipe 22 are connected to U-shaped pipes 23 and 24 whose downward ends are provided so as to penetrate the trace pipe support portion 10a of the upper casing 10 and the flange 12 on the suction port 11 side. Therefore, rainwater does not enter the inside of the pit hole 32 through the penetrating portion of the trace tube 22.

  Further, in the case of heavy rain or the like, even if a large amount of rainwater enters the region on the side of the eruption pump 1 beyond the oil breakwater 27, the foundation 31 as in the penetration part 71a of the conventional foundation 71 shown in FIG. Since no through portion is provided in the pit hole 32, rainwater does not enter the pit hole 32.

  Therefore, since rainwater that has entered the inside of the pit 32 does not rust and corrode the trace tube 22 and the barrel 3, there is no light oil leak or steam leak. The initial performance of the fuel pump 1 can be maintained for a long time.

  Further, when water such as rainwater accumulates in the inside of the well 32 for some reason, the drainage pump 26 a can be operated to drain water from the inside of the well 32 through the draining pipe 26. Even in this case, since the film 9 is formed on the surface of the barrel 3, even if the humidity increases due to the water that has entered the inside of the pothole 32, rust is generated on the surface of the barrel 3 and corrodes. There is nothing.

DESCRIPTION OF SYMBOLS 1,41 Ejection pump 2,42 Pump main body 3,43 Barrel 4 Flange 5,45 Drain hole 6 Plug 7,47 Multistage impeller 8,48 Rotating shaft 9 Coating 10 Upper casing 10a Trace pipe support 11, 51 Suction port 12 Flange 13, 53 Discharge port 14 Flange 15 Oil draining pipe 15a Oil drain pump 16, 56 Shaft joint 17 Casing 18 Bearing part 19 Joint part 20, 60 Motor 21, 61 Rotating shaft 22, 62 Trace pipe 23 U-shaped pipe 24 U-shaped pipe 25 Steam pipe 26, 66 Drain pipe 26a Drain pump 27, 67 Oil barrier 28, 68 Seal member 29 Oil feed pipe
30, 70 Ground part 31, 71 Base 71a Penetration part 32, 72 Bore hole 73 Bottom plate 74 Protective pipe 75 Drain pipe

Claims (5)

A fuel injection pump that boosts fuel oil and sends it to the combustion chamber,
A pump main body accommodated in a pothole provided in the ground, provided on the ground portion, a suction port for sucking the fuel oil into the pump main body, provided on the ground portion, and A discharge port for discharging the fuel oil whose pressure has been increased from the pump body;
A jet fuel pump characterized in that an oil drain pipe for draining the fuel oil from the inside of the pump body is connected to a portion upstream of the discharge port. The pump body includes a cylindrical barrel whose upper and lower ends are closed, a multistage impeller that is rotatably provided inside the barrel, and a rotary shaft that rotatably supports the multistage impeller.
An upper casing provided on the ground is attached to an upper portion of the barrel, the suction port for sucking the fuel oil into the barrel and the discharge for discharging the fuel oil from the barrel. 2. The eruption pump according to claim 1, wherein an outlet is provided, and the oil draining pipe is connected to a portion of the upper casing on the upstream side of the discharge port.   A trace pipe for circulating steam is wound around the barrel, and both ends of the trace pipe penetrate the inside of the upper casing and are drawn out to the ground. 2. The eruption pump according to 2.   The pair of U-shaped tubes are provided in the penetrating portion of the trace tube of the upper casing, and both ends of the trace tube are connected to the pair of U-shaped tubes. Volcanic pump.   5. The jet pump according to claim 2, wherein a film having a predetermined thickness is provided on a surface of the barrel.

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