Buoy liquid level meter applied to ship boiler liquid level measurement

Abstract

The invention discloses a buoy liquid level meter applied to ship boiler liquid level measurement, and relates to the technical field of measuring instruments, the buoy liquid level meter comprises a measuring cylinder, the measuring cylinder is communicated with a steam pocket through a communicating pipe, and two liquid level stabilizing grids which are vertically crossed in the longitudinal direction and the transverse direction are arranged in the measuring cylinder; the two liquid level stabilizing grids divide the interior of the measuring cylinder into four independent spaces, the liquid level stabilizing grids are provided with communicating holes communicated with the four independent spaces, and a plurality of liquid level electrodes used for measuring different water levels are arranged in the measuring cylinder. The system can effectively solve the problems that when the boiler drum water level swings towards all directions along with a ship body under the influence of sea waves, the boiler drum water level alarms falsely and even protection tripping occurs, and when the left-right alternate inclination frequency of the ship body is higher, the water level stability grid performance is more stable.

Description

Technical Field

[0001] The present application relates to the technical field of measuring instruments, and in particular to a buoy level gauge used for measuring the liquid level of a ship boiler. Background Art

[0002] The electric contact level gauge is a liquid level measuring device widely used in the industrial field. The traditional electric contact level gauge is mainly composed of a measuring tube, an electrode, a microprocessor unit, etc. The basic principle of its measurement is to connect the upper and lower parts of the measuring tube to the container through a connecting pipe, and the measuring tube will show a liquid level equal to the liquid level in the container. When the liquid level in the measuring barrel submerges the electrode installed on the measuring tube, the water level indicator corresponding to the electrode lights up, thereby reflecting the water level of the container. The water level indicator is usually integrated into a drum liquid level indication unit.

[0003] For the drum, the liquid level indicator unit is installed in the control room and arranged facing the operator to intuitively show the operator the change of the drum water level. The drum liquid level indicator unit is an important reference for the operator to perform emergency operations.

[0004] However, due to the role of the connecting pipe, the traditional electric contact level gauge cannot withstand the impact of the large changes in the liquid level caused by the left and right swing of the container itself. When the ship encounters wind and waves, it will sway violently, causing the water level in the drum to change sharply and drastically, and the liquid level in the measuring cylinder will change accordingly. However, this change cannot truly reflect the actual change in the amount of water in the drum, which may cause the operator to misjudge the safety of the drum water level, and then cause misoperation. Summary of the invention

[0005] The main purpose of the present application is to provide a float level gauge for measuring the liquid level of ship boilers, aiming to solve the problem that the existing electric contact level gauge is easily affected by the rapid change of external liquid level, which affects the liquid level in the measuring cylinder and makes it impossible to accurately measure the water level of the steam drum.

[0006] The technical solutions adopted in this application are as follows:

[0007] A floating cylinder level gauge used for measuring the liquid level of a ship boiler comprises a measuring cylinder, the measuring cylinder is connected to a steam drum through a connecting pipe, two liquid level stabilizing grids vertically intersecting each other are arranged in the measuring cylinder, the two liquid level stabilizing grids divide the interior of the measuring cylinder into four independent spaces, the liquid level stabilizing grids are provided with connecting holes connecting the four independent spaces, and a plurality of liquid level electrodes for measuring different water levels are arranged in the measuring cylinder.

[0008] Optionally, the liquid level stabilizing grille is made of 316L stainless steel, and the thickness of the liquid level stabilizing grille is not less than 5 mm.

[0009] Optionally, the upper and lower ends of the liquid level stabilizing grid are provided with supporting feet, the supporting feet are welded to the inner wall of the measuring cylinder, and the length of the supporting feet is 5-10 mm.

[0010] Optionally, the communicating hole is 2-10 mm away from the edge of the liquid level stabilizing grid.

[0011] Optionally, among the four independent spaces, at least two independent spaces that are diagonally opposite to each other are provided with liquid level electrodes.

[0012] Optionally, the connecting hole is a waist-shaped hole, the width of the hole is 8 mm, the length of the hole is 10 mm, and the two ends of the hole are semicircular arcs with a radius of 4 mm.

[0013] Optionally, the top and bottom of the measuring cylinder are connected to the top and bottom of the steam drum respectively through the connecting pipe.

[0014] Optionally, the liquid level stabilizing grid is at the same height as the connecting pipe located at the top.

[0015] Optionally, the bottom of the measuring cylinder is arranged on a sewage pipe.

[0016] Optionally, a mounting hole for mounting a liquid level electrode is provided on the wall of the measuring cylinder, and the liquid level electrode is inserted and installed in the mounting hole.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] The present application proposes a floating drum level gauge for measuring the liquid level of a ship boiler. The liquid level stabilizing grids that are vertically and horizontally crossed are arranged in the measuring tube, and the measuring tube is divided into four independent spaces by the liquid level stabilizing grids. A connecting hole connecting the four independent spaces is arranged on the liquid level stabilizing grid. When the boiler drum tilts to one side, the liquid level in the measuring tube will change accordingly under the action of the connecting pipe. When the inclination angle of the drum changes, the liquid levels in different areas of the measuring tube are restricted by the liquid level stabilizing grid and the changing rate is reduced under the blocking effect of the liquid level stabilizing grid, thereby alleviating the error in measuring the drum water level caused by the short-term and large-scale tilt of the hull, and can effectively solve the problem of false alarm of the drum water level or even protective tripping caused by the swaying of the boiler drum water level in all directions with the hull of the ship under the influence of waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the working state of a traditional electric contact level gauge when the hull remains stationary;

[0020] Figure 2 This is a schematic diagram of the working state of a traditional electric contact level gauge when the hull tilts to the left;

[0021] Figure 3This is a schematic diagram of the working state of a traditional electric contact level gauge when the hull tilts to the right;

[0022] Figure 4 This is a schematic diagram of the working state of the measuring tube electric contact type liquid level gauge of this application when the hull remains stationary;

[0023] Figure 5 This is a schematic diagram of the working state of the measuring tube electric contact type liquid level gauge of this application when the hull tilts to the left;

[0024] Figure 6 This is a schematic diagram of the working state of the measuring tube electric contact type liquid level gauge of this application when the hull tilts to the right;

[0025] Figure 7 This is a schematic cross-sectional view of the measuring tube electric contact type liquid level gauge of the present application;

[0026] Figure 8 It is a top view of the internal structure of the measuring tube;

[0027] Fig. 9 for Figure 7 The enlarged image at point I in the middle;

[0028] Fig.10 for Figure 7 Enlarged view of point II in the middle.

[0029] Description of the reference numerals in the accompanying drawings:

[0030] 1-connecting pipe, 2-connecting flange, 3-liquid level electrode, 4-liquid level stabilization grid, 5-drain pipe, 6-measuring cylinder, 7-connecting hole. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0032] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0035] As a supplementary explanation of the background technology, the measuring cylinder of the traditional electric contact liquid level gauge is equipped with multiple groups of liquid level electrodes for measuring different water levels. The liquid level electrodes are connected to the microprocessor, and the microprocessor is connected to the water level indicator. When the water level submerges the liquid level electrodes of the corresponding height, the water level indicator located in the control room lights up, thereby reflecting the current drum water level. When the water in the drum shakes due to external factors, the liquid level in the measuring cylinder will change dramatically, resulting in inaccurate measurement results of the electric contact liquid level gauge.

[0036] For the convenience of subsequent description, the multiple groups of liquid level electrodes are named as extremely low liquid level electrode, low-low liquid level electrode and low liquid level electrode, extremely high liquid level electrode, high-high liquid level electrode and high liquid level electrode.

[0037] like Figure 1 As shown, when the hull remains stationary, the traditional electric contact level gauge is connected to the steam drum through a connecting pipe, the liquid level in the measuring tube is at the same height as the liquid level in the steam drum, the extremely low liquid level electrode, the low-low liquid level electrode and the low liquid level electrode are immersed below the water level line, the extremely high liquid level electrode, the high-high liquid level electrode and the high liquid level electrode are exposed to the gas phase in the measuring tube, and the water level indicator light shows a normal liquid level state.

[0038] like Figure 2As shown, when the hull tilts to the left, the steam drum tilts to the left synchronously. Due to the action of the connecting pipe, the liquid level in the measuring cylinder changes rapidly with the liquid level in the steam drum. The extremely low liquid level electrode (or low-low liquid level electrode, or low liquid level electrode) is exposed to the gas phase, and the water level indicator light shows an extremely low liquid level alarm. However, the liquid level in the steam drum is actually in a normal state in this state, and a false alarm is caused by the hull tilting to the left.

[0039] like Figure 3 As shown in the figure, when the hull tilts to the right, the steam drum tilts to the right synchronously. Due to the effect of the connecting pipe, the liquid level in the measuring cylinder changes rapidly with the liquid level in the steam drum. The extremely high liquid level electrode (or high-high liquid level electrode, or high liquid level electrode) is immersed in the water phase, and the water level indicator shows an extremely high liquid level alarm. In this state, the liquid level in the steam drum is actually in a normal state, and the false alarm is caused by the left tilt of the hull.

[0040] It can be seen that for the traditional electric contact level gauge, when the total amount of the drum water level has not changed, a serious false water level alarm will occur due to the tilt of the hull.

[0041] The problem that the traditional electric contact liquid level gauge is easily affected by the rapid change of the external liquid level, which leads to the inability to accurately measure the drum water level, is not solved. The embodiment of the present application provides a measuring tube 6 electric contact liquid level gauge for measuring the liquid level of a ship boiler. Compared with the traditional electric contact liquid level gauge, the difference lies in the structural design of the measuring tube 6. Specifically, Figures 4 to 10 As shown, it includes a measuring tube 6, the top and bottom of the measuring tube 6 are connected to the top and bottom of the drum through a connecting pipe 1, so that the water level in the drum and the water level in the measuring tube 6 have the same water level when the hull remains stationary. The connecting pipe 1 includes a pipe body and a connecting flange 2, and the connecting flange 2 is convenient for connecting the connecting pipes 1 to each other. A sewage pipe 5 is provided at the bottom of the measuring tube 6.

[0042] like Figure 7 and Figure 8 As shown, two vertically intersecting liquid level stabilizing grids 4 are welded in the measuring cylinder 6, wherein Fig. 9 As shown, the top and bottom ends of the liquid level stabilizing grid 4 are integrally formed with legs, the length of the legs is 5-10 mm, and the legs are welded to the inner wall of the measuring tube 6, so that there is a 5-10 mm gap between the liquid level stabilizing grid 4 and the tube wall of the measuring tube 6. In this embodiment, the liquid level grid plate is made of 316L stainless steel material, and the organizational characteristics of 316L are austenitic stainless steel. It is widely used in the chemical industry due to its excellent corrosion resistance. 316L is also a derivative steel of 18-8 austenitic stainless steel, and 2-3% Mo element is added. This content makes this steel have excellent corrosion resistance and can be safely used in environments containing halogen ions such as Cl.

[0043] In the above, the vertically intersecting liquid level stabilizing grid 4 divides the interior of the measuring tube 6 into four independent spaces, and the two independent spaces located on the upper side are defined as chamber I and chamber III, and the two independent spaces located on the lower side are defined as chamber II and chamber IV. Each liquid level stabilizing grid 4 is provided with a plurality of connecting holes 7 connecting the four independent spaces, and the connecting holes 7 are 2-10 mm away from the edge of the liquid level stabilizing grid 4. Fig.10 As shown, the connecting hole 7 is a waist-shaped hole, the width of the hole is 8 mm, the length of the hole is 10 mm, and the two ends of the hole are semicircular arcs with a radius of 4 mm.

[0044] At the same time, among the four independent spaces, at least two independent spaces that are diagonally opposite to each other are provided with liquid level electrodes 3, and the wall of the measuring cylinder 6 is provided with mounting holes for installing the liquid level electrodes 3. The liquid level electrodes 3 are installed in the mounting holes in an inserted manner. The liquid level electrodes 3 are defined as extremely low liquid level electrode, low-low liquid level electrode and low liquid level electrode, high liquid level electrode, high-high liquid level electrode and extremely high liquid level electrode from bottom to top.

[0045] The present application proposes a measuring tube 6 electric contact type liquid level meter for measuring the liquid level of a ship boiler. The working principle is as follows: Taking chamber I and chamber III as an example

[0046] like Figure 4 As shown, when the hull remains stationary, due to the effect of the connecting hole 7, the liquid level of chamber I on both sides of the grid is equal to the corresponding liquid level of chamber III, and is equal to the drum liquid level. The extremely low liquid level electrode, the low-low liquid level electrode and the low liquid level electrode are immersed below the water level line, the extremely high liquid level electrode, the high-high liquid level electrode and the high liquid level electrode are exposed to the gas phase of the measuring tube 6, and the water level indicator is in a normal liquid level state

[0047] like Figure 5 As shown, when the hull tilts to the left, the steam drum tilts to the left synchronously, and the measuring tube 6 tilts to the left synchronously. Due to the function of the connecting hole 7, the liquid in chamber I flows to chamber III through the connecting hole 7. At the same time, due to the presence of the liquid level stabilizing grid 4, the flow rate is hindered, so that the liquid level changes in chambers I and III lag behind the changes in the steam drum liquid level. Within a certain period of time, the extremely low liquid level electrode (or low-low liquid level electrode, or low liquid level electrode) located in chamber I is still immersed below the water level line, and the extremely high liquid level electrode (or high-high liquid level electrode, or high liquid level electrode) is still exposed to the gas phase of the measuring tube 6, and the liquid level will not change rapidly in a short period of time.

[0048] like Figure 6As shown, when the hull tilts to the right, the steam drum tilts to the right synchronously, and the measuring tube 6 tilts to the right accordingly. Due to the function of the connecting hole 7, the liquid in chamber III flows to chamber I through the connecting hole 7. At the same time, the existence of the liquid level stabilizing grid 4 hinders the flow rate, so that the liquid level changes in chambers III and I lag behind the changes in the steam drum liquid level. Within a certain period of time, the extremely low liquid level electrode (or low-low liquid level electrode, or low liquid level electrode) located in chamber I is still immersed below the water level line, and the extremely high liquid level electrode (or high-high liquid level electrode, or high liquid level electrode) is still exposed to the gas phase of the measuring tube 6, and the liquid level will not change rapidly in a short period of time.

[0049] It can be seen that the buoy level gauge for ship boiler level measurement provided in the embodiment of the present application will reduce the occurrence of false water level alarms of the electric contact level gauge. The higher the frequency of the hull's alternating left and right tilting, the more stable the water level stability grid will be.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A buoy level gauge used for measuring the liquid level of a ship boiler, characterized in that: It includes a measuring cylinder, which is connected to the steam drum through a connecting pipe. Two liquid level stabilization grids that are vertically crossed are arranged in the measuring cylinder. The two liquid level stabilization grids divide the interior of the measuring cylinder into four independent spaces. The liquid level stabilization grids are provided with connecting holes that connect the four independent spaces. A plurality of liquid level electrodes for measuring different water levels are arranged in the measuring cylinder.

2. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The liquid level stabilizing grid is made of 316L stainless steel, and the thickness of the liquid level stabilizing grid is not less than 5 mm.

3. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The upper and lower ends of the liquid level stabilizing grid are provided with supporting feet, the supporting feet are welded to the inner wall of the measuring cylinder, and the length of the supporting feet is 5-10 mm.

4. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The communicating hole is 2-10 mm away from the edge of the liquid level stabilizing grid.

5. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: Among the four independent spaces, at least two independent spaces that are diagonally opposite to each other are provided with liquid level electrodes.

6. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The connecting hole is a waist-shaped hole, the width of the hole is 8 mm, the length of the hole is 10 mm, and the two ends of the hole are semicircular arcs with a radius of 4 mm.

7. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The top and bottom of the measuring cylinder are respectively connected with the top and bottom of the steam drum through the connecting pipe.

8. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 7, characterized in that: The liquid level stabilizing grid is at the same height as the connecting pipe located at the top.

9. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The bottom of the measuring cylinder is arranged on the sewage discharge pipe.

10. The buoy level gauge for measuring the liquid level of a ship boiler according to claim 1, characterized in that: The cylinder wall of the measuring cylinder is provided with a mounting hole for mounting a liquid level electrode, and the liquid level electrode is inserted and mounted in the mounting hole.

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