Ship cargo hold liquid level monitoring system and ship

Abstract

The ship cargo hold liquid level monitoring system comprises a guide pipe, the guide pipe penetrates through a bottom plate of a cargo hold, an upper end opening of the guide pipe is formed in the cargo hold, a lower end opening of the guide pipe is formed in a pipe tunnel area below the cargo hold, a plug is arranged at the lower end opening, and the lower end opening of the guide pipe is communicated with the bottom plate of the cargo hold. A piezoelectric type liquid level sensor is arranged on the guide pipe and connected with a control system through a cable. The ship comprises the ship cargo hold liquid level monitoring system. The liquid level sensor not in the cargo hold can accurately measure the liquid level of the cargo hold, the situation that when water is injected into the cargo hold to extinguish the cargo hold, a heat source in the cargo hold affects the liquid level sensor is avoided, the cable connected with the liquid level sensor and the junction box are both arranged in a dry pipe tunnel area, a non-immersed cable low in cost can be adopted, and the fire extinguishing efficiency is improved. And the ship cargo hold liquid level monitoring cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ship construction, and in particular to a ship cargo hold liquid level monitoring system and a ship. Background Art

[0002] Ship firefighting is an important part of ensuring ship safety. Cargo hold water injection is an emergency firefighting measure, usually considered when a fire occurs and other firefighting methods are ineffective. A large amount of water is injected into the cargo hold to control the fire, reduce the temperature and eventually extinguish the fire. Water injection into the cargo hold will change the weight distribution of the ship. Therefore, when injecting water into the cargo hold, the impact of the water level in the hold on the performance of the entire ship structure must be considered. The liquid level in the hold must be monitored to keep the liquid level in the hold within a safe range.

[0003] The existing liquid level monitoring in the cargo hold of a ship usually adopts a ship cargo hold water ingress alarm sensor as disclosed in Chinese patent CN 220509530, which will alarm when the water level reaches the alarm position of the liquid level sensor. However, if the above liquid level sensor is installed in a ship cargo hold where a fire may occur, the liquid level sensor is easily affected by the heat source of the fire, resulting in inaccurate monitoring of the liquid level in the cargo hold, and the cable connecting the liquid level sensor needs to be a waterproof immersion cable, which has a high fire protection cost. Summary of the invention

[0004] In view of the defects existing in the prior art, the present application provides a ship cargo hold liquid level monitoring system and a container ship to solve the technical problems in the prior art that the liquid level detection device in the ship cargo hold is easily affected by the heat source of fire and the liquid level detection cost in the ship cargo hold is high.

[0005] In order to achieve the purpose of the above invention, the technical solution provided by the present invention is as follows:

[0006] A ship cargo hold liquid level monitoring system, wherein a pipe area is arranged below the cargo hold, and the ship cargo hold liquid level monitoring system comprises a conduit, wherein the conduit passes through the bottom plate of the cargo hold, an upper port of the conduit is arranged in the cargo hold, a lower port of the conduit is arranged in the pipe area, a plug is arranged at the lower port, a piezoelectric liquid level sensor is arranged on the conduit, and the liquid level sensor is connected to a control system via a cable.

[0007] In one embodiment, a 90° elbow is fixedly provided at the upper port of the conduit, and a horizontal tube is fixedly provided at the other end of the elbow.

[0008] In one embodiment, the length of the horizontal tube is 80mm-120mm, and the distance between the axis of the horizontal tube and the bottom plate of the cargo hold is 80mm-120mm.

[0009] In one embodiment, a tank penetration sleeve is provided between the conduit and the cargo hold bottom plate.

[0010] In one embodiment, the measuring range of the liquid level sensor is greater than or equal to the maximum liquid level height allowed in the cargo hold.

[0011] In one embodiment, the conduit includes a vertical pipe and a branch pipe communicating with the vertical pipe, the branch pipe is arranged horizontally, and the liquid level sensor is arranged on the branch pipe.

[0012] In one embodiment, a stop valve is provided on the vertical pipe, and the stop valve is located between the cargo hold bottom plate and the interface between the branch pipe and the vertical pipe, and the plug is a blind flange.

[0013] In one embodiment, the ship cargo hold liquid level monitoring system further comprises a junction box, wherein the junction box is arranged in a pipe area, and the cable is a non-submersible cable.

[0014] In one embodiment, the ship cargo hold liquid level monitoring system is arranged at the stern of the cargo hold and located at the centerline of the hull.

[0015] The present application also provides a ship, comprising the above-mentioned ship cargo hold liquid level monitoring system.

[0016] Compared with the prior art, this application has at least the following beneficial effects:

[0017] The present invention adopts a piezoelectric liquid level sensor, and the liquid level sensor is arranged in a pipe area below the cargo hold where no water is injected. The liquid level sensor senses the static pressure generated by water injection in the cargo hold through a conduit with an upper port arranged in the cargo hold and a lower port arranged in the pipe area, so that the liquid level sensor which is not in the cargo hold can accurately measure the liquid level in the cargo hold, thereby avoiding the heat source in the cargo hold affecting the liquid level sensor when the cargo hold is extinguished by injecting water into the cargo hold. The cable and the junction box connecting the liquid level sensor are both arranged in a dry pipe area, so a low-cost non-submersible cable can be used, thereby reducing the cost of monitoring the liquid level in the ship's cargo hold. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of a ship cargo hold in an embodiment of the present application;

[0019] Figure 2 It is a structural schematic diagram of a ship cargo hold liquid level monitoring system in an embodiment of the present application.

[0020] Figure numerals: 1. conduit; 101. elbow; 102. horizontal pipe; 3. tank casing; 4. stop valve; 5. liquid level sensor; 6. cable; 7. junction box; 8. plug; 9. branch pipe; 10. cargo hold; 11. pipe area. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0022] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "a", "said" and "the" used in this disclosure and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0023] It should be understood that although the terms first, second, third, etc. may be used in the present disclosure to describe various information, such information should not be limited to these terms and should not be understood as indicating or implying relative importance. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0024] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0025] In order to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings.

[0026] like Figure 1 , 2 As shown, the present application provides a ship cargo hold liquid level monitoring system, a pipe area 11 is arranged below the cargo hold 10, the ship cargo hold liquid level monitoring system comprises a conduit 1, the conduit 1 passes through the bottom plate of the cargo hold 10, the upper port of the conduit 1 is arranged in the cargo hold 10, the lower port of the conduit 1 is arranged in the pipe area 11, the lower port is provided with a plug 8, a piezoelectric liquid level sensor 5 is arranged on the conduit 1, and the liquid level sensor 5 is connected to the control system through a cable 6.

[0027] In order to prevent debris from entering the conduit 1 and affecting the operation of the liquid level sensor 5, a 90° elbow 101 is fixedly provided at the upper end of the conduit 1, and a horizontal tube 102 is fixedly provided at the other end of the elbow 101. The length of the horizontal tube 102 is 80mm-120mm, and the distance between the axis of the horizontal tube 102 and the bottom plate of the cargo hold 10 is 80mm-120mm, so as to prevent water from entering the conduit 1 and leaving gas in the conduit 1 to affect the measurement accuracy of the liquid level sensor 5. In this embodiment, the length of the horizontal tube 102 is 100mm, and the distance between the center of the horizontal tube 102 and the bottom plate of the cargo hold 10 is 100mm.

[0028] A through-tank sleeve 3 is provided between the conduit 1 and the bottom plate of the cargo hold 10 to ensure the watertightness of the cargo hold 10 and prevent water in the cargo hold from entering the pipe area. The range of the liquid level sensor 5 is greater than or equal to the maximum liquid level height allowed in the cargo hold 10.

[0029] In this embodiment, the conduit 3 includes a vertical pipe and a branch pipe 9 connected to the vertical pipe. The branch pipe 9 is arranged horizontally, and the liquid level sensor 5 is arranged on the branch pipe 9 so that the liquid level sensor 5 can be removed during maintenance. A stop valve 4 is arranged on the vertical pipe. The stop valve 4 is located between the bottom plate of the cargo hold 10 and the interface between the branch pipe 9 and the vertical pipe. The plug 8 is a blind flange, and the blind flange is connected to the lower end flange of the conduit 1. The blind flange has a strong pressure bearing capacity and can withstand the high water level pressure in the cargo hold. When the ship cargo hold liquid level monitoring system needs to clean the debris in the conduit or remove the liquid level sensor 5, close the stop valve 4, remove the plug 8 to clean the garbage and debris in the conduit or remove the stop valve 4 on the branch pipe 9.

[0030] The ship cargo hold liquid level monitoring system also includes a junction box 7, which is arranged in the pipe area 11 to protect the wire connection point from the influence of the external environment and ensure the safety and reliability of the electrical connection. The liquid level sensor 5 is arranged in a dry pipe area, so the cable 6 is a non-immersed cable to reduce the cost of the ship cargo hold liquid level detection system. The conduit 1, the elbow 102 and the horizontal pipe 102 are all made of galvanized steel to ensure the corrosion resistance of the ship cargo hold liquid level monitoring system. In order to improve the measurement accuracy of the ship cargo hold liquid level monitoring system, the ship cargo hold liquid level monitoring system in this embodiment is arranged at the tail of the cargo hold 10 and is located at the centerline of the hull.

[0031] The ship cargo hold liquid level monitoring system in the present application sets the liquid level sensor 5 in a pipe area below the cargo hold 10 where no water is injected. The liquid level sensor 5 is a piezoelectric liquid level sensor. The liquid level sensor 5 measures the water level in the ship cargo hold in a non-contact manner through the conduit 3, thereby preventing the heat source in the cargo hold from affecting the liquid level sensor when the cargo hold is extinguished. The cable 6 and the junction box 7 connecting the liquid level sensor 5 are both set in a dry pipe area, so a low-cost non-submersible cable can be used, thereby reducing the cost of ship cargo hold liquid level monitoring.

[0032] This embodiment also provides a ship, comprising the above-mentioned ship cargo hold liquid level monitoring system.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A ship cargo hold liquid level monitoring system, wherein a pipe area is provided below the cargo hold, characterized in that: The ship cargo hold liquid level monitoring system includes a conduit, which passes through the bottom plate of the cargo hold, the upper port of the conduit is arranged in the cargo hold, the lower port of the conduit is arranged in the conduit area, the lower port is provided with a plug, and a piezoelectric liquid level sensor is arranged on the conduit, and the liquid level sensor is connected to the control system through a cable.

2. The ship cargo hold liquid level monitoring system according to claim 1, characterized in that: A 90° elbow is fixedly arranged at the upper end of the conduit, and a horizontal pipe is fixedly arranged at the other end of the elbow.

3. The ship cargo hold liquid level monitoring system according to claim 2, characterized in that: The length of the horizontal tube is 80mm-120mm, and the distance between the axis of the horizontal tube and the cargo hold bottom plate is 80mm-120mm.

4. The ship cargo hold liquid level monitoring system according to claim 1, characterized in that: A tank-penetrating sleeve is arranged between the conduit and the cargo hold bottom plate.

5. The ship cargo hold liquid level monitoring system according to claim 1, characterized in that: The measuring range of the liquid level sensor is greater than or equal to the maximum liquid level height allowed in the cargo hold.

6. The ship cargo hold liquid level monitoring system according to claim 1, characterized in that: The conduit comprises a vertical pipe and a branch pipe communicating with the vertical pipe, the branch pipe is arranged horizontally, and the liquid level sensor is arranged on the branch pipe.

7. The ship cargo hold liquid level monitoring system according to claim 6, characterized in that: The vertical pipe is provided with a stop valve, which is located between the cargo hold bottom plate and the interface between the branch pipe and the vertical pipe, and the plug is a blind flange.

8. The ship cargo hold liquid level monitoring system according to claim 7, characterized in that: The ship cargo hold liquid level monitoring system further comprises a junction box, which is arranged in a pipe area, and the cable is a non-submersible cable.

9. The ship cargo hold liquid level monitoring system according to claim 1, characterized in that: The ship cargo hold liquid level monitoring system is arranged at the rear of the cargo hold and is located at the center line of the hull.

10. A ship, characterized in that: It comprises a ship cargo hold liquid level monitoring system as described in any one of claims 1 to 9.

Images