An overflow alarm box and an overflow alarm method

Abstract

The invention discloses an overflow alarm box and an overflow alarm method. The overflow alarm box includes an upper overflow pipe and a lower overflow pipe, the upper end of the upper overflow pipe is connected to an upper outer flange, the lower end of the lower overflow pipe is connected to a lower outer flange, an overflow cylinder is arranged on the periphery of the lower overflow pipe, an upper annular flange is connected between the overflow cylinder and the upper overflow pipe, a lower annular flange is connected between the overflow cylinder and the lower overflow pipe, an overflow baffle is arranged between the upper overflow pipe and the lower overflow pipe, and the overflow baffle is connected to the pipe wall of the lower overflow pipe through a supporting foot; an annular space for storing overflow oil is formed between the outer circle of the lower overflow pipe and the inner hole of the overflow cylinder, a float chamber is arranged on the outer wall of the overflow cylinder, an overflow flow hole connecting the annular space and the float chamber is arranged on the cylinder wall of the overflow cylinder, and a float switch is installed in the float chamber. The invention facilitates the installation of the overflow alarm box and the observation of the liquid level in the overflow alarm box, and improves the sensitivity of the overflow alarm device in the case of a slight overflow of fuel.

Description

Technical Field

[0001] The present invention relates to the technical field of marine auxiliary equipment, and particularly relates to an overflow alarm box and an overflow alarm method. Background Art

[0002] An overflow alarm device is usually required to be arranged on the overflow pipeline of a ship fuel oil delivery system to monitor whether the control system fails.

[0003] In the prior art, a typical overflow alarm device has a cabinet structure, and a liquid level chamber is arranged inside and a liquid level switch for monitoring whether the fuel oil overflows is installed. The main problems thereof are as follows:

[0004] First, a separate base needs to be set for the overflow alarm cabinet, and both the volume and weight are relatively large, occupying a large floor space, being inconvenient for installation and maintenance, and being unable to observe the internal liquid flow condition due to the structure.

[0005] Second, small holes need to be opened on the liquid level chamber of the overflow alarm cabinet to prevent the accumulation of residual overflow oil. However, the opening of the small holes on the liquid level chamber will reduce the sensitivity of the overflow alarm device, resulting in that when the fuel oil has a slow overflow (micro overflow), all the overflow oil drains away from the small holes, so that the liquid level in the liquid level chamber cannot rise and the liquid level switch cannot act. Summary of the Invention

[0006] In order to solve the above problems, the present invention provides an overflow alarm box and an overflow alarm method, aiming to facilitate the installation of the overflow alarm box and the observation of the liquid level in the overflow alarm box, and improve the sensitivity of the overflow alarm device in the case of micro overflow of the fuel oil. The specific technical solutions are as follows:

[0007] An overflow alarm box includes an upper overflow pipe and a lower overflow pipe which are vertically arranged at intervals in the up-and-down position. The upper port of the upper overflow pipe is connected with an upper outer flange, and the lower port of the lower overflow pipe is connected with a lower outer flange. An overflow cylinder is arranged above the lower outer flange and around the lower overflow pipe. An upper annular flange is connected between the upper port of the overflow cylinder and the lower outer circumference of the upper overflow pipe, and a lower annular flange is connected between the lower port of the overflow cylinder and the lower outer circumference of the lower overflow pipe. An overflow baffle is arranged between the lower port of the upper overflow pipe and the upper port of the lower overflow pipe. The overflow baffle is connected with the pipe wall of the lower overflow pipe through a plurality of support feet arranged circumferentially; a circular space for storing overflow oil is formed between the outer circumference of a section of the lower overflow pipe above the lower annular flange and the inner hole of the overflow cylinder. A float chamber is arranged on the outer wall of the overflow cylinder, an overflow through hole communicating the circular space and the float chamber is arranged on the cylinder wall of the overflow cylinder, a float switch is installed in the float chamber, and the float switch is connected with a fuel oil overflow alarm system.

[0008] Preferably, the overflow flow holes include a lower overflow flow hole arranged on the cylinder wall of the overflow cylinder and close to the bottom of the float chamber, and an upper overflow flow hole arranged on the cylinder wall of the overflow cylinder and close to the middle of the float chamber.

[0009] Preferably, the overflow baffle is located directly below the upper overflow pipe, and the lower overflow pipe is located directly below the overflow baffle, and the outer circle size of the overflow baffle is larger than the outer circle size of the lower overflow pipe.

[0010] Preferably, the middle portion of the overflow baffle protrudes upward in an arc shape.

[0011] Preferably, transparent observation windows are provided on both sides of the outer cylinder wall of the overflow cylinder.

[0012] In the present invention, a number of oil leakage channels are circumferentially arranged on the tube wall of the lower overflow pipe for preventing residual fuel from accumulating in the annular space, one end of the oil leakage channel is connected to the interior of the lower overflow pipe, and the other end of the oil leakage channel is connected to the annular space and close to the bottom of the annular space.

[0013] As a further improvement of the present invention, a first oil drain hole is arranged on the lower annular flange, and a second oil drain hole is arranged on the wall of the overflow cylinder located below the lower annular flange, and the oil drain channel is a tube body, one end of the tube body is connected to the first oil drain hole, and the other end of the tube body is connected to the second oil drain hole.

[0014] Preferably, an overflow sensitive floating assembly for improving the overflow alarm sensitivity in case of a slight overflow of fuel is also provided in the annular space, and the overflow sensitive floating assembly includes an annular magnetic rubber sheet sleeved on the outer circle of the lower overflow pipe and a low-density annular part connected to the upper end face of the annular magnetic rubber sheet; the overall average density of the overflow sensitive floating assembly is less than the density of the overflow oil, and the lower end face of the annular magnetic rubber sheet is magnetically adsorbed on the end face of the lower annular flange and seals the first oil drain hole on the lower annular flange.

[0015] Preferably, the low-density annular member is a low-density polyurethane foam annular sleeve having a density lower than that of the overflow oil, or the low-density annular member is an annular inflatable ball.

[0016] Preferably, the annular inflatable ball is an annular hydrogen balloon.

[0017] The annular member on the above-mentioned overflow-sensitive floating assembly adopts a low-density annular member, so that when the overflow oil in the annular space reaches a certain height, the overflow-sensitive floating assembly can automatically float on the upper liquid surface of the overflow oil by the buoyancy of the overflow oil to overcome the magnetic suction force and its own gravity, thereby facilitating the discharge of the remaining overflow oil in the annular space. During the discharge process of the overflow oil, the overflow-sensitive floating assembly suspended on the upper liquid surface of the overflow oil moves downward together with the decrease in the liquid level of the overflow oil until the accumulated overflow oil in the annular space is emptied, and the lower end surface of the annular magnetic rubber sheet on the overflow-sensitive floating assembly is magnetically adsorbed on the end surface of the lower annular flange again and seals the first oil discharge hole on the lower annular flange.

[0018] An overflow alarm method for an overflow alarm box sequentially includes the following steps:

[0019] (1) Initial preparation for overflow monitoring: When there is no fuel overflow, the lower end surface of the annular magnetic rubber sheet in the overflow alarm box is adsorbed on the end surface of the lower annular flange under the action of the magnetic force and seals the first oil discharge hole on the lower annular flange, and the overflow alarm box is in the initial preparation state for overflow monitoring;

[0020] (2) Overflow monitoring and alarm: When there is fuel overflow, the overflow oil enters the annular space of the overflow alarm box. When the liquid level of the overflow oil in the annular space rises to a pre-set first liquid level height, the float switch acts first, so that the fuel overflow alarm system issues an oil spill alarm to notify the maintenance personnel to troubleshoot the fault;

[0021] (3) Discharge of overflow oil: During the waiting process for the fuel overflow alarm system to issue an oil spill alarm to notify the maintenance personnel to troubleshoot the fault, the liquid level of the overflow oil in the annular space continues to rise. When the liquid level of the overflow oil in the annular space rises to a pre-set second liquid level height, the upward buoyancy F of the overflow oil received by the overflow-sensitive floating assembly is greater than the sum of the weight W of the overflow-sensitive floating assembly and the magnetic adsorption force P between the annular magnetic rubber sheet on the overflow-sensitive floating assembly and the lower annular flange, that is, the relational expression F>W + P is satisfied, so that the overflow-sensitive floating assembly rises under the action of the buoyancy F and completely disengages from the lower annular flange and floats on the upper liquid surface of the overflow oil; in the case where the overflow oil slowly enters the annular space in a small amount, the overflow oil only discharges downward into the interior of the downcomer through the oil discharge channel communicating with the annular space; in the case where the overflow rate of the overflow oil is large, the liquid level of the overflow oil in the annular space continues to rise, so that the overflow oil also enters the interior of the downcomer from the upper port of the downcomer for discharge;

[0022] (4) Overflow troubleshooting: The maintenance personnel troubleshoot the fault to eliminate the fuel overflow;

[0023] (5) Drainage of residual overflow oil: After the fuel overflow is eliminated, the residual overflow oil in the annular space of the overflow alarm box continues to overflow downward into the interior of the drain pipe through the drain channel connecting the annular space. During the drainage of the overflow oil, the overflow-sensitive floating assembly suspended on the upper liquid level of the overflow oil moves downward together with the decrease in the liquid level of the overflow oil until the accumulated overflow oil in the annular space is drained. The lower end surface of the annular magnetic rubber sheet on the overflow-sensitive floating assembly is magnetically adsorbed again on the end surface of the lower annular flange to seal the first drain hole on the lower annular flange, so that the overflow alarm box returns to the initial preparation state of overflow monitoring.

[0024] The beneficial effects of the present invention are as follows:

[0025] First, for an overflow alarm box and an overflow alarm method of the present invention, both the overflow inlet and outlet are connected by flanges, and no additional base needs to be set during installation; the middle structure is cylindrical, which can reduce the volume and weight of the entire device and greatly facilitate installation. In addition, glass observation windows are provided on both sides of the overflow cylinder to observe the liquid flow situation in real time. Thus, it can also monitor, alarm, and control the safe operation of the overflow pipeline and related compartments.

[0026] Second, for an overflow alarm box and an overflow alarm method of the present invention, an overflow-sensitive floating assembly is provided, which can not only meet the drainage of the accumulated residual overflow oil in the overflow alarm box through the drain channel, but also improve the sensitivity of the overflow alarm device in the case of a small amount of fuel overflow, so as to detect potential fault hazards early and improve safety. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of an overflow alarm box of the present invention;

[0028] Figure 2 is Figure 1 the left view of

[0029] Figure 3 is based on Figure 1 a further improved schematic structural diagram of

[0030] Figure 4 is Figure 3 the partial enlarged view of

[0031] In the figure: 1. Upper overflow pipe; 2. Lower overflow pipe; 3. Upper outer flange; 4. Lower outer flange; 5. Overflow cylinder; 6. Upper annular flange; 7. Lower annular flange; 8. Overflow baffle; 9. Support feet; 10. Annular space; 11. Float chamber; 12. Overflow through hole; 13. Float switch; 14. Lower overflow through hole; 15. Upper overflow through hole; 16. Transparent observation window; 17. Oil drain channel; 18. First oil drain hole; 19. Second oil drain hole; 20. Pipe body (oil drain channel); 21. Overflow-sensitive floating assembly; 22. Annular magnetic rubber sheet; 23. Low-density annular part. Detailed implementation manners

[0032] The following combines the accompanying drawings and embodiments to further describe the detailed implementation manners of the present invention. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and cannot be used to limit the protection scope of the present invention.

[0033] Embodiment 1:

[0034] As Figures 1 to 4 shown is an embodiment of an overflow alarm box of the present invention, including an upper overflow pipe 1 and a lower overflow pipe 2 arranged vertically at intervals in the up and down positions. The upper port of the upper overflow pipe 1 is connected with an upper outer flange 3, and the lower port of the lower overflow pipe 2 is connected with a lower outer flange 4. An overflow cylinder 5 is arranged above the lower outer flange 4 and around the lower overflow pipe 2. An upper annular flange 6 is connected between the upper port of the overflow cylinder 5 and the lower outer circumference of the upper overflow pipe 2, and a lower annular flange 7 is connected between the lower port of the overflow cylinder 5 and the lower outer circumference of the lower overflow pipe 2. An overflow baffle 8 is arranged between the lower port of the upper overflow pipe 1 and the upper port of the lower overflow pipe 2, and the overflow baffle 8 is connected to the pipe wall of the lower overflow pipe 2 through a plurality of support feet 9 arranged circumferentially; an annular space 10 for storing overflow oil is formed between the outer circumference of a section of the lower overflow pipe 2 above the lower annular flange 7 and the inner hole of the overflow cylinder 5. A float chamber 11 is arranged on the outer wall of the overflow cylinder 5, an overflow through hole 12 communicating the annular space 10 and the float chamber 11 is arranged on the cylinder wall of the overflow cylinder 5, a float switch 13 is installed in the float chamber 11, and the float switch 13 is connected to a fuel overflow alarm system.

[0035] Preferably, the overflow through hole 12 includes a lower overflow through hole 14 arranged on the cylinder wall of the overflow cylinder 5 and close to the bottom of the float chamber 11, and an upper overflow through hole 15 arranged on the cylinder wall of the overflow cylinder 5 and close to the middle of the float chamber 11.

[0036] Preferably, the overflow baffle 8 is located directly below the upper overflow pipe 1, the lower overflow pipe 2 is located directly below the overflow baffle 8, and the outer diameter of the overflow baffle 8 is larger than the outer diameter of the lower overflow pipe 2.

[0037] Preferably, the middle part of the plate body of the overflow baffle 8 is arched upward.

[0038] Preferably, transparent observation windows 16 are provided on both sides of the outer wall of the overflow cylinder 5.

[0039] In the present invention, a plurality of oil discharge channels 17 for preventing residual fuel from accumulating in the annular space 10 are circumferentially provided on the pipe wall of the lower overflow pipe 2. One end of the oil discharge channel 17 communicates with the inside of the lower overflow pipe 2, and the other end of the oil discharge channel 17 communicates with the annular space 10 and is close to the bottom position of the annular space 10.

[0040] As a further improvement of the present invention, a first oil discharge hole 18 is provided on the lower annular flange 7, and a second oil discharge hole 19 is provided on the barrel wall of the overflow cylinder 5 at a position below the lower annular flange 7. The oil discharge channel 17 is a pipe body 20. One end of the pipe body 20 is connected to the first oil discharge hole 18, and the other end of the pipe body 20 is connected to the second oil discharge hole 19.

[0041] Preferably, an overflow-sensitive floating assembly 21 for improving the overflow alarm sensitivity in the case of a small amount of fuel overflow is further provided in the annular space 10. The overflow-sensitive floating assembly 21 includes an annular magnetic rubber sheet 22 sleeved on the outer circle of the lower overflow pipe 2 and a low-density annular member 23 connected to the upper end surface of the annular magnetic rubber sheet 22. The overall average density of the overflow-sensitive floating assembly 21 is less than the density of the overflow oil. The lower end surface of the annular magnetic rubber sheet 22 is magnetically adsorbed on the end surface of the lower annular flange 7 and seals the first oil discharge hole 18 on the lower annular flange 7.

[0042] Preferably, the low-density annular member 23 is a low-density polyurethane foam annular sleeve with a density less than that of the overflow oil, or the low-density annular member 23 is an annular inflatable ball.

[0043] Preferably, the annular inflatable ball is an annular hydrogen balloon.

[0044] The annular member on the above-mentioned overflow-sensitive floating assembly 21 adopts a low-density annular member 23 so that when the overflow oil in the annular space 10 reaches a certain height, the overflow-sensitive floating assembly 21 can automatically float on the upper liquid surface of the overflow oil by the buoyancy of the overflow oil to overcome the magnetic suction force and its own gravity, thereby facilitating the discharge of the residual overflow oil in the annular space 10. During the discharge process of the overflow oil, the overflow-sensitive floating assembly 21 suspended on the upper liquid surface of the overflow oil moves downward together with the decrease in the liquid level of the overflow oil until the accumulated overflow oil in the annular space 10 is emptied, and the lower end surface of the annular magnetic rubber sheet 22 on the overflow-sensitive floating assembly 21 is magnetically adsorbed on the end surface of the lower annular flange 7 again to seal the first oil discharge hole 18 on the lower annular flange 7.

[0045] Embodiment 2:

[0046] An overflow alarm method using the overflow alarm box of Embodiment 1 successively includes the following steps:

[0047] (1) Initial preparation for overflow monitoring: In the absence of fuel overflow, the lower end surface of the annular magnetic rubber sheet 23 in the overflow alarm box is adsorbed on the end surface of the lower annular flange 7 under the action of magnetic force to seal the first oil discharge hole 18 on the lower annular flange 7, and the overflow alarm box is in the initial preparation state for overflow monitoring;

[0048] (2) Overflow monitoring and alarm: In the case of fuel overflow, the overflow oil enters the annular space 10 of the overflow alarm box. When the liquid level of the overflow oil in the annular space 10 rises to a pre-set first liquid level height, the float switch 13 acts first, so that the fuel overflow alarm system issues an oil spill alarm to notify the maintenance personnel to troubleshoot the problem;

[0049] (3) Drainage of the overflow oil: During the waiting process for the fuel overflow alarm system to send an overflow alarm to notify the maintenance personnel to troubleshoot, the liquid level of the overflow oil in the annular space 10 continues to rise. When the liquid level of the overflow oil in the annular space 10 rises to a pre-set second liquid level height, the upward buoyancy F of the overflow oil received by the overflow-sensitive floating assembly 21 is greater than the sum of the weight W of the overflow-sensitive floating assembly 21 and the magnetic adsorption force P between the annular magnetic rubber sheet 22 on the overflow-sensitive floating assembly 21 and the lower annular flange 7, that is, the relation F > W + P is satisfied, so that the overflow-sensitive floating assembly 21 rises upward under the action of the buoyancy F and completely disengages from the lower annular flange 7 and floats on the upper liquid surface of the overflow oil; in the case where a small amount of overflow oil slowly enters the annular space 10, the overflow oil only drains downward into the interior of the lower overflow pipe 2 through the oil drain channel 17 communicating with the annular space 10; in the case where the overflow rate of the overflow oil is large, the liquid level of the overflow oil in the annular space 10 continues to rise, so that the overflow oil also enters the interior of the lower overflow pipe 2 from the upper port of the lower overflow pipe 2 for drainage;

[0050] (4) Troubleshooting of the overflow fault: The maintenance personnel perform troubleshooting to eliminate the fuel overflow;

[0051] (5) Emptying of the residual overflow oil: After the fuel overflow is eliminated, the residual overflow oil in the annular space 10 of the overflow alarm box continues to drain downward into the interior of the lower overflow pipe 2 through the oil drain channel 17 communicating with the annular space 10. During the drainage of the overflow oil, the overflow-sensitive floating assembly 21 suspended on the upper liquid surface of the overflow oil moves downward together with the decrease in the liquid level height of the overflow oil until the accumulated overflow oil in the annular space 10 is emptied, and the lower end surface of the annular magnetic rubber sheet 22 on the overflow-sensitive floating assembly 21 is magnetically adsorbed again on the end surface of the lower annular flange 7 and seals the first oil drain hole 18 on the lower annular flange 7, so that the overflow alarm box returns to the initial preparation state of overflow monitoring.

[0052] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An overflow alarm box, It is characterized in that The invention comprises an upper overflow pipe and a lower overflow pipe which are arranged vertically at intervals in upper and lower positions, wherein the upper port portion of the upper overflow pipe is connected with an upper outer flange, the lower port portion of the lower overflow pipe is connected with a lower outer flange, an overflow cylinder is arranged above the lower outer flange and at the periphery of the lower overflow pipe, an upper annular flange is connected between the upper port portion of the overflow cylinder and the lower outer circle of the upper overflow pipe, a lower annular flange is connected between the lower port portion of the overflow cylinder and the lower outer circle of the lower overflow pipe, and a lower annular flange is connected between the lower port portion of the upper overflow pipe and the lower overflow pipe An overflow baffle is arranged between the upper and lower ports of the oil pump and the oil pump, and the overflow baffle is connected to the pipe wall of the lower overflow pipe through a number of supporting feet arranged along the circumferential direction; an annular space for storing overflow oil is formed between a section of the outer circle above the lower annular flange on the lower overflow pipe and the inner hole of the overflow cylinder, a float chamber is arranged on the outer wall of the overflow cylinder, an overflow hole connecting the annular space and the float chamber is arranged on the cylinder wall of the overflow cylinder, a float switch is installed in the float chamber, and the float switch is connected to the fuel overflow alarm system; A plurality of oil leakage channels are circumferentially arranged on the wall of the lower overflow pipe for preventing residual fuel from accumulating in the annular space, one end of the oil leakage channel is connected to the interior of the lower overflow pipe, and the other end of the oil leakage channel is connected to the annular space and close to the bottom of the annular space; A first oil drain hole is provided on the lower annular flange, a second oil drain hole is provided on the pipe wall of the lower overflow pipe at a position lower than the first oil drain hole, the oil drain channel is a pipe body, one end of the pipe body is connected to the first oil drain hole, and the other end of the pipe body is connected to the second oil drain hole; An overflow sensitive floating assembly for improving the overflow alarm sensitivity in case of a slight overflow of fuel is also provided in the annular space. The overflow sensitive floating assembly includes an annular magnetic rubber sheet sleeved on the outer circle of the lower overflow pipe and a low-density annular component connected to the upper end face of the annular magnetic rubber sheet. The overall average density of the overflow sensitive floating assembly is less than the density of the overflow oil. The lower end face of the annular magnetic rubber sheet is magnetically adsorbed on the end face of the lower annular flange and seals the first oil drain hole on the lower annular flange.

2. An overflow alarm box according to claim 1, It is characterized in that The overflow flow holes include a lower overflow flow hole arranged on the cylinder wall of the overflow cylinder and close to the bottom of the float chamber, and an upper overflow flow hole arranged on the cylinder wall of the overflow cylinder and close to the middle of the float chamber.

3. An overflow alarm box according to claim 1, It is characterized in that The overflow baffle is located directly below the upper overflow pipe, and the lower overflow pipe is located directly below the overflow baffle. The outer circle size of the overflow baffle is larger than the outer circle size of the lower overflow pipe.

4. An overflow alarm box according to claim 3, It is characterized in that The middle part of the plate body of the overflow baffle protrudes upward in an arc shape.

5. An overflow alarm box according to claim 1, It is characterized in that Transparent observation windows are provided on both sides of the outer cylinder wall of the overflow cylinder.

6. A kind of overflow alarm box according to claim 1, characterized in that the low-density annular member is a low-density polyurethane foam annular sleeve with a density less than that of the overflow oil, or the low-density annular member is an annular inflatable ball.

7. An overflow alarm method using the overflow alarm box according to any one of claims 1 to 6, characterized in that it successively includes the following steps: (1) Initial preparation for overflow monitoring: When there is no fuel overflow, the lower end face of the annular magnetic rubber sheet in the overflow alarm box is adsorbed on the end face of the lower annular flange under the action of magnetic force and seals the first oil discharge hole on the lower annular flange, and the overflow alarm box is in the initial preparation state for overflow monitoring; (2) Overflow monitoring and alarm: When there is fuel overflow, the overflow oil enters the annular space of the overflow alarm box. When the liquid level of the overflow oil in the annular space rises to the pre-set first liquid level height, the float switch acts first, so that the fuel overflow alarm system issues an oil spill alarm to notify the maintenance personnel to troubleshoot; (3) Discharge of the overflow oil: During the waiting process for the fuel overflow alarm system to issue an oil spill alarm to notify the maintenance personnel to troubleshoot, the liquid level of the overflow oil in the annular space continues to rise. When the liquid level of the overflow oil in the annular space rises to the pre-set second liquid level height, the upward buoyancy F of the overflow oil received by the overflow-sensitive floating assembly is greater than the sum of the weight W of the overflow-sensitive floating assembly and the magnetic adsorption force P between the annular magnetic rubber sheet on the overflow-sensitive floating assembly and the lower annular flange, that is, the relational expression F>W + P is satisfied, so that the overflow-sensitive floating assembly rises upward under the action of the buoyancy F and completely disengages from the lower annular flange and floats on the upper liquid surface of the overflow oil; when the overflow oil slowly enters the annular space in a small amount, the overflow oil only discharges downward into the interior of the downcomer through the oil discharge channel communicating with the annular space; when the overflow rate of the overflow oil is large, the liquid level of the overflow oil in the annular space continues to rise, so that the overflow oil also enters the interior of the downcomer from the upper port of the downcomer for discharge; (4) Overflow troubleshooting: The maintenance personnel troubleshoot to eliminate the fuel overflow; (5) Emptying the remaining overflow oil: After the fuel overflow is eliminated, the remaining overflow oil in the annular space of the overflow alarm box continues to discharge downward into the interior of the downcomer through the oil discharge channel communicating with the annular space. During the discharge process of the overflow oil, the overflow-sensitive floating assembly suspended on the upper liquid surface of the overflow oil moves downward together with the decrease of the liquid level of the overflow oil until the accumulated overflow oil in the annular space is emptied, and the lower end face of the annular magnetic rubber sheet on the overflow-sensitive floating assembly is magnetically adsorbed on the end face of the lower annular flange again and seals the first oil discharge hole on the lower annular flange, so that the overflow alarm box returns to the initial preparation state for overflow monitoring.

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