CN211602101U - Nuclear power plant electric main feed pump lubricating oil tank liquid level monitoring device - Google Patents

Abstract

The utility model discloses a liquid level monitoring device for a lubricating oil tank of an electric main feed pump of a nuclear power plant, which comprises a buoy, a magnetic pole, a buoy and other structures, the magnetic pole is connected with a floater, the buoy comprises a first section extending into the oil tank and a second section exposed out of the oil tank, the bottom surface of the first section is provided with an oil hole for oil to enter and exit, the side wall of the first section is provided with at least one oil window for oil to enter and exit, the float is positioned in the first section, the magnetic pole is positioned in the second section, the side wall of the second section is provided with a row of turning plates, the magnetic pole follows the movement when the float moves to trigger the turnover plate to turn over so as to indicate the liquid level, because the oil window is arranged on the side wall of the floating barrel, the floating barrel is semi-sealed, the lubricating oil can freely flow from the floating barrel to the oil tank, and the phenomenon that the floating ball forms a liquid seal effect in the lubricating oil to influence liquid level monitoring is avoided.

Description

Nuclear power plant electric main feed pump lubricating oil tank liquid level monitoring device

Technical Field

The utility model relates to a nuclear power field especially relates to an electronic main feed pump lubricating-oil tank liquid level monitoring device of nuclear power plant.

Background

The electric main water supply pump system (APA) has the main functions of pumping out and boosting water in the deaerator and sending the water to the steam generator through the high-pressure heater, and can respond to the speed change requirement and ensure that different water supply flows are provided for the steam generator in the whole thermal load range of the reactor. The normal lubricating oil level is one of the important conditions for the normal operation of the electric main water feed pump, and the liquid level monitoring of the lubricating oil tank only depends on a unique monitoring device arranged on the oil tank.

The lubricating oil tank liquid level monitoring device comprises a floater, a buoy and other parts, wherein the floater moves up and down along with the oil level in the oil tank under the action of buoyancy/gravity, and the position of the floater is changed due to different liquid levels. Because lubricating oil rises fast after the switching of electronic main feed pump is accomplished, submerge the float rapidly, because of float and barrel wall clearance undersize (general floater external diameter is 48mm, the flotation pontoon internal diameter is 50mm, the radius difference is only 1mm) and oil are thick, lead to float and flotation pontoon to form the liquid seal effect, the unable automatic come-up of float under no external force help causes liquid level detection device to send out the warning by mistake, lead to electronic main feed pump to withdraw from the hot standby state, reduce APA system's reliability, and influence personnel's judgement, make improper emergency response.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a nuclear power plant's electronic main feed pump lubricating-oil tank liquid level monitoring device is provided.

The utility model provides a technical scheme that its technical problem adopted is: the liquid level monitoring device for the lubricating oil tank of the electric main feed water pump of the nuclear power plant comprises a buoy, a magnetic pole and a floater, wherein the magnetic pole is connected with the floater, the buoy comprises a first section and a second section, the first section is used for extending into the oil tank, the second section is used for exposing the outside of the oil tank, an oil hole for oil to come in and go out is formed in the bottom surface of the first section, at least one oil window for oil to come in and go out is formed in the side wall of the first section,

the float is located in the first section, the magnetic pole is located in the second section, a row of turning plates are arranged on the side wall of the second section, and the magnetic pole moves along with the float to trigger the turning plates to turn over when the float moves so as to indicate the liquid level.

Preferably, a plurality of oil windows are formed in the side wall of the first section, and the oil windows are uniformly distributed along the outer circumferential direction of the buoy.

Preferably, the oil window is a rectangular window.

Preferably, the magnetic pole and the float are connected by a link.

Preferably, an annular plastic guide sheet is fixed on the inner wall of the second section, and the plastic guide sheet is arranged below the magnetic pole and surrounds the connecting rod.

Preferably, the flap is provided with a magnet.

Preferably, the device is still including distributing two fluid switches outside the buoy, two fluid switches are located the outside different height of second district section, fluid switch is magnetic proximity switch, magnetic proximity switch is used for being in the magnetic pole is triggered when pressing close to and is sent the signal to DCS.

Preferably, the top of the second section is connected to the space at the top of the tank by a line.

Preferably, the pipeline is an inverted U-shaped pipeline.

The utility model discloses an electronic main feed pump lubricating-oil tank liquid level monitoring device of nuclear power plant has following beneficial effect: the float moves with following the removal of magnetic pole when removing to trigger and turn over the board upset and indicate the liquid level, owing to set up the oil window at the lateral wall of flotation pontoon, the flotation pontoon is semi-sealed, can realize lubricating oil from the flotation pontoon toward free flow in the oil tank, avoid the flotation pontoon to form the liquid seal effect and influence liquid level monitoring in lubricating oil.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts:

FIG. 1 is a schematic structural diagram of a liquid level monitoring device of a lubricating oil tank of an electric main feed pump of a nuclear power plant;

fig. 2 is a schematic view of the structure of the lower part of the pontoon.

Detailed Description

Lead to float and flotation pontoon to form the liquid seal effect in order to solve current device when appearing submerging the float rapidly, cause liquid level detection device to send out the warning by mistake, the utility model discloses an electronic main feed pump lubricating-oil tank liquid level monitoring device of nuclear power plant sets up the oil window at the lateral wall of flotation pontoon, and the flotation pontoon is semi-sealed, can realize lubricating oil from the flotation pontoon toward free flow in the oil tank, avoids the flotation pontoon to form the liquid seal effect and influence liquid level monitoring in lubricating oil.

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Exemplary embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the embodiments and specific features in the embodiments of the present invention are described in detail in the present application, but not limited to the present application, and the technical features in the embodiments and specific features in the embodiments of the present invention can be combined with each other without conflict.

It is noted that the term "coupled" or "connected" as used herein includes not only the direct coupling of two entities, but also the indirect coupling via other entities with beneficial and improved effects. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The terms including ordinal numbers such as "first", "second", and the like used in the present specification may be used to describe various components, but the components are not limited by the terms. These terms are used only for the purpose of distinguishing one constituent element from other constituent elements. For example, a first component may be named a second component, and similarly, a second component may also be named a first component, without departing from the scope of the present invention.

Referring to fig. 1, the utility model discloses an electronic main feed water pump lubricating-oil tank liquid level monitoring device of nuclear power plant, including flotation pontoon 2, magnetic pole 4 and float 3. The magnetic pole 4 and the floater 3 are positioned in the float bowl 2, the magnetic pole 4 is connected with the floater 3, the side wall of the float bowl 2 is provided with a turning plate 5, the turning plate 5 is used for displaying the liquid level, and the magnetic pole 4 and the floater 3 are used for sensing the liquid level of lubricating oil in the float bowl 2 and acting on the turning plate 5 for displaying. The float 2 is used for guiding the float 3 to float up and down.

Specifically, the magnetic pole 4 and the float 3 are connected through a connecting rod, the buoy 2 is approximately cylindrical and comprises a first section and a second section, the first section is used for extending into the oil tank 1, the second section is used for being exposed out of the oil tank 1, the float 3 is located in the first section, the magnetic pole 4 is located in the second section, a row of turning plates 5 are arranged on the side wall of the second section, and the magnetic pole 4 moves along with the movement of the float 3 to trigger the turning plates 5 to turn so as to indicate the liquid level. Specifically, the turning plate 5 is provided with a magnet, the colors of the upper surface and the lower surface of the turning plate 5 are different, and when the floating ball drives the magnetic pole 4 to move downwards, the turning plate 5 in the moving path of the magnetic pole 4 is triggered to gradually turn downwards to display the color of the lower surface; when the floating ball drives the magnetic pole 4 to move upwards, the turning plate 5 in the moving path of the magnetic pole 4 is triggered to gradually turn downwards to display the color of the upper surface, so that the liquid level condition can be visually displayed through the state of the turning plate 5.

Referring to fig. 2, the bottom surface of the first section is provided with oil holes for oil to enter and exit, the side wall of the first section is provided with at least one oil window 21 for oil to enter and exit, in this embodiment, the oil window 21 is a rectangular window, the side wall of the first section is provided with a plurality of oil windows 21, and the plurality of oil windows 21 are uniformly distributed along the outer circumferential direction of the buoy 2. Of course, in other embodiments, the oil window 21 may have other shapes, and the arrangement may not be uniform, as long as the contact mode between the float 2 and the lubricating oil is a semi-sealing mode, so as to realize the free flow of the lubricating oil from the float 2 to the oil tank 1, and avoid the floating ball from forming a liquid seal effect in the lubricating oil, which is within the protection scope of the present invention.

Furthermore, an annular plastic guide sheet 9 is fixed on the inner wall of the second section, the plastic guide sheet 9 is horizontally arranged, and the plastic guide sheet 9 is arranged below the magnetic pole 4 and surrounds the connecting rod. The existence of the plastic guide sheet 9 can avoid the connecting rod from being distorted to cause the floating ball and the magnetic pole 4 to rub the buoy 2.

Further, the device is still including distributing 2 outer two fluid switches 6, 7 of flotation pontoon, two fluid switches 6, 7 are located the outside not co-altitude of second district section, fluid switch 6 is used for realizing high liquid level detection, and fluid switch 7 is used for realizing low liquid level detection. The oil switches 6 and 7 are magnetic proximity switches, the magnetic proximity switches are used for being triggered to send signals to the DCS when the magnetic poles 4 are close to each other, and the DCS alarms and starts the pump to allow logic processing of the signals.

Further, the top of the second section is connected to the space at the top of the fuel tank 1 via a pipe 8. Preferably, the pipeline 8 in this embodiment is an inverted U-shaped pipeline. Thus, pressure equalization can be ensured.

The working principle of the embodiment is as follows: oil penetrates into the buoy 2 from an oil hole at the bottom of the buoy 2 and an oil window 21 at the side part, the floater 3 moves up and down along with the oil level under the action of buoyancy/gravity, and the magnetic pole 4 is driven by the connecting rod to move. The magnetic pole 4, on the one hand, magnetically turns the left turning plate 5 to indicate the oil level in the oil tank 1, and on the other hand, when the magnetic pole approaches to an oil level switch, the magnetic pole triggers a switch signal due to magnetic force and generates an alarm. When the magnetic pole 4 moves up and down and is far away from the oil level switch, the corresponding alarm automatically disappears, and the turning plate 5 turns over to indicate the oil level in the oil tank 1.

To sum up, the utility model discloses an electronic main feed pump lubricating-oil tank liquid level monitoring device of nuclear power plant has following beneficial effect: the float moves with following the removal of magnetic pole when removing to trigger and turn over the board upset and indicate the liquid level, owing to set up the oil window at the lateral wall of flotation pontoon, the flotation pontoon is semi-sealed, can realize lubricating oil from the flotation pontoon toward free flow in the oil tank, avoid the flotation pontoon to form the liquid seal effect and influence liquid level monitoring in lubricating oil.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many modifications may be made by one skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims (9)

1. The utility model provides an electronic main feed water pump lubricating-oil tank liquid level monitoring device of nuclear power plant, a serial communication port, including flotation pontoon, magnetic pole and float are connected, the flotation pontoon is including being used for stretching into the first district section in the oil tank and being used for exposing the second district section outside the oil tank, the oilhole that is used for the confession fluid to come in and go out is offered to the bottom surface in first district section, at least one oil window that is used for the confession fluid to come in and go out is seted up to the lateral wall in first district section, the float is located in the first district section, the magnetic pole is located the second district section, the lateral wall in second district section is provided with one row of board that turns over, the magnetic pole is in follow when.

2. The device of claim 1, wherein the side wall of the first section is provided with a plurality of oil windows, and the plurality of oil windows are uniformly distributed along the outer circumferential direction of the buoy.

3. The apparatus of claim 1 or 2, wherein the oil window is a rectangular window.

4. The device of claim 1, wherein the magnetic pole and float are connected by a linkage.

5. The apparatus of claim 4, wherein the second section inner wall secures an annular plastic guide tab disposed below the pole and around the link.

6. The device of claim 1, wherein the flap is provided with a magnet.

7. The apparatus of claim 1, further comprising two oil switches distributed outside the float, the two oil switches being located at different elevations outside the second section, the oil switches being magnetic proximity switches configured to be triggered to send a signal to the DCS when the poles are proximate.

8. The apparatus of claim 1, wherein the top of the second section is connected to the space at the top of the tank by a line.

9. The apparatus of claim 8, wherein the pipeline is an inverted U-shaped pipeline.

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