A signal feedback box for a common DBB valve of a ship's inert gas system and nitrogen system

Abstract

The application provides a signal feedback box for a DBB valve shared by a ship inert gas system and a nitrogen system, which comprises a dual-path power automatic switching device, which is used for ensuring that the DBB valve shared box can work normally when the inert gas or nitrogen system loses power, so that the other system can continue to supply power to the DBB valve shared box; the dual-path power automatic switching device is connected with a nitrogen control system power supply, an inert gas control system power supply and a relay group; the relay group is used for receiving system mode signals, system low voltage signals and control command signals of the DBB valve from outside, and outputting alarm suppression signals and cargo oil pump interlocking signals to the outside. The application realizes that the DBB valve is shared by the inert gas system and the nitrogen system, and relevant signal feedback is realized. The ship building cost is greatly saved, and the space of the ship cargo deck area is also saved.

Description

Technical Field

[0001] This invention belongs to the field of liquid cargo ship technology, specifically relating to a signal feedback box for a DBB valve shared by a ship's inert gas system and nitrogen system. Background Technology

[0002] Since many liquid cargo ships transport both oil and chemicals, they are equipped with both inert gas and nitrogen systems. Each of these systems is equipped with a check valve, which increases shipbuilding costs and makes it difficult to arrange equipment in the cargo deck area.

[0003] Both the inert gas system and the nitrogen system require interlocking with the cargo pump, meaning the cargo pump must stop immediately when the gas main reaches a predetermined low-pressure limit. This necessitates writing control logic between the cargo pump system and the inert gas and nitrogen systems, significantly increasing the workload of software development and debugging. Summary of the Invention

[0004] To address the technical problems in the prior art, this invention provides a signal feedback box for a shared DBB valve in a ship's inert gas system and nitrogen system. It includes a dual-power automatic switching device, which ensures that when either the inert gas or nitrogen system loses power, the other system continues to supply power to the shared DBB valve box to ensure its normal operation. The dual-power automatic switching device is connected to the nitrogen control system power supply, the inert gas control system power supply, and a relay group. The relay group receives system mode signals, system low-pressure signals, and DBB valve control command signals, and outputs alarm suppression signals and cargo oil pump interlock signals.

[0005] Furthermore, the relay group includes relays K1, K2, K3, K4, K5, K6, K7, K8, K9, and K10 connected in series with the dual-power automatic switching device, wherein: Relays K1 and K2 are connected to a two-position selector switch on the central control panel, corresponding to nitrogen mode and inert gas mode, respectively. Relays K3 and K4 are connected to the DBB valve and are used to receive or disconnect control command signals from the nitrogen system and the inert gas system to the DBB valve, respectively. Relays K5, K6, K7 and K8 are connected to the DBB valve and are used to receive or disconnect the shared BLOCK valve 1 position feedback signal, the shared BLOCK valve 2 position feedback signal, the shared BLEED valve 1 position feedback signal and the shared BLEED valve 2 position feedback signal, respectively. Relays K9 and K10 are connected to the nitrogen system and the inert gas system, respectively, and are used to receive atmospheric pressure signals from the nitrogen system and the inert gas system.

[0006] Furthermore, relays K5, K6, K7, and K8 are configured in two sets, respectively used to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the nitrogen system and to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the inert gas system.

[0007] Furthermore, the contacts of relays K1 and K2 are K1-1 and K2-1, respectively, and both K1-1 and K2-1 are normally open contacts. When relay K1 or relay K2 is energized, K1-1 or K2-1 closes, outputting a closing signal to the inert gas system or nitrogen system. After receiving this closing signal, the inert gas system or nitrogen system must maintain the start-up lockout until the signal is disconnected.

[0008] Furthermore, the relay K1 also includes contact K1-2, and the relay K2 also includes contact K2-2. Both K1-2 and K2-2 are normally closed contacts. When relay K1 or K2 is energized, contact K1-2 or K2-2 is opened. The K1-2 disconnects and outputs an open circuit signal to the inert gas system. After receiving this open circuit signal, the inert gas system suppresses the alarm caused by the inconsistency between the DBB valve position feedback information and the DBB valve control command given by the inert gas system. The K2-2 disconnects and outputs an open circuit signal to the nitrogen system. Upon receiving this open circuit signal, the nitrogen system suppresses alarms caused by inconsistencies between the DBB valve position feedback information and the DBB valve control commands given by the nitrogen system.

[0009] Furthermore, the contacts of relays K3 and K4 are K3-1 and K4-1, respectively. The nitrogen system outputs a control command signal to the DBB valve common box, energizing relay K3 and closing normally open contact K3-1. Since normally open contact K1-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in inert gas mode can the inert gas system control the DBB valve. The inert gas system outputs a control command signal to the DBB valve common box, energizing relay K4 and closing normally open contact K4-1. Since normally open contact K2-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in nitrogen mode can the nitrogen system control the DBB valve.

[0010] Furthermore, the contacts of relays K5, K6, K7, and K8 are all normally open contacts. The shared DBB valve feeds back the valve position status to the DBB common box. When relays K5, K6, K7, and K8 are energized, their normally open contacts close, sending the valve position feedback signal to the inert gas system and the nitrogen system.

[0011] Furthermore, the contacts of relays K9 and K10 are both normally open contacts. When in nitrogen mode, the normally open contact K1-1 is closed. If the nitrogen pressure is at a normal value, relay K9 is energized, and the normally open contact of K9 closes, outputting a start signal to the liquid pump system. If the nitrogen pressure is low, relay K9 is de-energized, and the normally open contact of K9 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running. In inert gas mode, the normally open contact K2-1 is closed. If the nitrogen pressure is at a normal value, relay K10 is energized, and the normally open contact of K10 closes, outputting a start signal to the liquid pump system. If the inert gas pressure is low, relay K10 is de-energized, and the normally open contact of K10 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running.

[0012] Furthermore, it also includes terminal blocks and indicator lights.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention enables the sharing of a DBB valve and related signal feedback between the inert gas system and the nitrogen system. This significantly reduces shipbuilding costs and also saves space in the ship's cargo deck area. Attached Figure Description

[0014] Figure 1 This is the principle framework diagram I of the present invention; Figure 2 This is the principle framework diagram II of the present invention. Detailed Implementation

[0015] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] Reference Figure 1 This application proposes a signal feedback box for a DBB valve shared by a marine inert gas system and a nitrogen system. This signal feedback box is used for DBB valves shared by marine inert gas and nitrogen systems, and is suitable for liquid cargo ships. It mainly includes a dual-power automatic switching device, relays, terminal blocks, indicator lights, etc.

[0017] 1) The dual-power automatic switching device is mainly used to ensure that when the inert gas or nitrogen system loses power, the other system can continue to supply power to the DBB valve common box to ensure the normal operation of the DBB valve common box.

[0018] 2) The K1 to K10 relays inside the box are mainly used to receive system mode signals, system low pressure signals and DBB valve control command signals, as well as output alarm suppression signals and cargo oil pump interlock signals.

[0019] Specifically, including: The system includes a dual-power automatic switching device, terminal blocks, and indicator lights. The dual-power automatic switching device ensures that the other system can continue to supply power to the DBB valve common box to ensure its normal operation after the inert gas or nitrogen system loses power. The dual-power automatic switching device is connected to the nitrogen control system power supply, the inert gas control system power supply, and a relay group. The relay group is used to receive system mode signals, system low pressure signals, and DBB valve control command signals, as well as to output alarm suppression signals and cargo oil pump interlock signals.

[0020] The relay group includes relays K1, K2, K3, K4, K5, K6, K7, K8, K9, and K10, which are connected in series with the dual-power automatic switching device, wherein: Relays K1 and K2 are connected to a two-position selector switch on the central control panel, corresponding to nitrogen mode and inert gas mode, respectively. Relays K3 and K4 are connected to the DBB valve and are used to receive or disconnect control command signals from the nitrogen system and the inert gas system to the DBB valve, respectively. Relays K5, K6, K7 and K8 are connected to the DBB valve and are used to receive or disconnect the shared BLOCK valve 1 position feedback signal, the shared BLOCK valve 2 position feedback signal, the shared BLEED valve 1 position feedback signal and the shared BLEED valve 2 position feedback signal, respectively. Relays K9 and K10 are connected to the nitrogen system and the inert gas system, respectively, and are used to receive atmospheric pressure signals from the nitrogen system and the inert gas system.

[0021] Relays K5, K6, K7, and K8 are set in two sets, respectively used to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the nitrogen system and to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the inert gas system.

[0022] The contacts of relays K1 and K2 are K1-1 and K2-1, respectively, and both K1-1 and K2-1 are normally open contacts. When relay K1 or relay K2 is energized, K1-1 or K2-1 closes, and the output closing signal is sent to the inert gas system or nitrogen system. After receiving this closing signal, the inert gas system or nitrogen system must maintain the start-up lockout until the signal is disconnected.

[0023] Relay K1 also includes contact K1-2, and relay K2 also includes contact K2-2. Both K1-2 and K2-2 are normally closed contacts. When relay K1 or K2 is energized, contact K1-2 or K2-2 is opened. K1-2 disconnects the output open circuit signal to the inert gas system. After receiving this open circuit signal, the inert gas system suppresses the alarm caused by the inconsistency between the DBB valve position feedback information and the DBB valve control command given by the inert gas system. K2-2 disconnects the output open circuit signal to the nitrogen system. After receiving this open circuit signal, the nitrogen system suppresses the alarm caused by the inconsistency between the DBB valve position feedback information and the DBB valve control command given by the nitrogen system.

[0024] The contacts of relays K3 and K4 are K3-1 and K4-1, respectively. The nitrogen system outputs a control command signal to the DBB valve common box, energizing relay K3 and closing normally open contact K3-1. Since normally open contact K1-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in inert gas mode can the inert gas system control the DBB valve. The inert gas system outputs a control command signal to the DBB valve common box, energizing relay K4 and closing normally open contact K4-1. Since normally open contact K2-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in nitrogen mode can the nitrogen system control the DBB valve.

[0025] The contacts of relays K5, K6, K7, and K8 are all normally open contacts. The shared DBB valve feeds back the valve position status to the DBB common box. When relays K5, K6, K7, and K8 are energized, their normally open contacts close, sending the valve position feedback signal to the inert gas system and the nitrogen system.

[0026] Both relays K9 and K10 have normally open contacts. When in nitrogen mode, the normally open contact K1-1 is closed. If the nitrogen pressure is at a normal value, relay K9 is energized, and the normally open contact of K9 closes, outputting a start signal to the liquid pump system. If the nitrogen pressure is low, relay K9 is de-energized, and the normally open contact of K9 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running. In inert gas mode, the normally open contact K2-1 is closed. If the nitrogen pressure is at a normal value, relay K10 is energized, and the normally open contact of K10 closes, outputting a start signal to the liquid pump system. If the inert gas pressure is low, relay K10 is de-energized, and the normally open contact of K10 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running.

[0027] Taking nitrogen mode as an example: When preparing to use the nitrogen system on board, the two-position selector switch on the central control panel must first be set to nitrogen mode. At this time, relay K1 is energized, and the normally open contact K1-1 closes, outputting a closed signal to the inert gas system. Upon receiving this closed signal, the inert gas system must maintain a start-locked state until the signal is released. The normally closed contact K1-2 then opens, outputting an open-circuit signal to the inert gas system. Upon receiving this open-circuit signal, the inert gas system suppresses alarms caused by inconsistencies between the DBB valve position feedback information and the DBB valve control commands issued by the inert gas system. The nitrogen system outputs a control command signal to the DBB valve common box, energizing relay K3 and closing normally open contact K3-1. Since normally open contact K1-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in inert gas mode can the inert gas system control the DBB valve. The shared DBB valve feeds back the valve position status to the DBB shared box. Relays K5, K6, K7, and K8 are energized, and normally open contacts K5, K6, K7, and K8 close, sending the valve position feedback signal to the inert gas system and the nitrogen system. When in nitrogen mode, normally open contact K1-1 is closed. If the nitrogen pressure is at a normal value, relay K9 is energized, normally open contact K9 closes, and a start signal is output to the liquid pump system. If the nitrogen pressure is low, relay K9 is de-energized, normally open contact K9 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running. The operation procedure for inert gas mode is the same as that for nitrogen mode.

[0028] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the specification are within the scope of the present invention.

Claims

1. A signal feedback box for a shared DBB valve used in marine inert gas and nitrogen systems, characterized in that: It includes a dual-power automatic switching device, which ensures that when the inert gas or nitrogen system loses power, the other system can continue to supply power to the DBB valve common box to ensure the normal operation of the DBB valve common box; the dual-power automatic switching device is connected to the nitrogen control system power supply, the inert gas control system power supply, and a relay group; the relay group is used to receive system mode signals, system low pressure signals, and DBB valve control command signals, and to output alarm suppression signals and cargo oil pump interlock signals. The relay group includes relays K1, K2, K3, K4, K5, K6, K7, K8, K9, and K10 connected in series with the dual-power automatic switching device, wherein: Relays K1 and K2 are connected to a two-position selector switch on the central control panel, corresponding to nitrogen mode and inert gas mode, respectively. Relays K3 and K4 are connected to the DBB valve and are used to receive or disconnect control command signals from the nitrogen system and the inert gas system to the DBB valve, respectively. Relays K5, K6, K7 and K8 are connected to the DBB valve and are used to receive or disconnect the shared BLOCK valve 1 position feedback signal, the shared BLOCK valve 2 position feedback signal, the shared BLEED valve 1 position feedback signal and the shared BLEED valve 2 position feedback signal, respectively. Relays K9 and K10 are connected to the nitrogen system and the inert gas system, respectively, and are used to receive atmospheric pressure signals from the nitrogen system and the inert gas system.

2. The signal feedback box for the shared DBB valve according to claim 1, characterized in that: Relays K5, K6, K7, and K8 are set in two sets, respectively used to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the nitrogen system and to provide feedback signals from the four valve positions of the BLOCK and BLEED valves to the inert gas system.

3. The signal feedback box for the shared DBB valve according to claim 2, characterized in that: The contacts of relays K1 and K2 are K1-1 and K2-1, respectively, and both K1-1 and K2-1 are normally open contacts. When relay K1 or relay K2 is energized, K1-1 or K2-1 closes, and a closing signal is output to the inert gas system or nitrogen system. After receiving this closing signal, the inert gas system or nitrogen system must maintain the start-up lockout until the signal is disconnected.

4. The signal feedback box for the shared DBB valve according to claim 3, characterized in that: The relay K1 also includes contact K1-2, and the relay K2 also includes contact K2-2. Both K1-2 and K2-2 are normally closed contacts. When relay K1 or K2 is energized, contact K1-2 or K2-2 is opened. The K1-2 disconnects and outputs an open circuit signal to the inert gas system. After receiving this open circuit signal, the inert gas system suppresses the alarm caused by the inconsistency between the DBB valve position feedback information and the DBB valve control command given by the inert gas system. The K2-2 disconnects and outputs an open circuit signal to the nitrogen system. Upon receiving this open circuit signal, the nitrogen system suppresses alarms caused by inconsistencies between the DBB valve position feedback information and the DBB valve control commands given by the nitrogen system.

5. The signal feedback box for the shared DBB valve according to claim 4, characterized in that: The contacts of relays K3 and K4 are K3-1 and K4-1, respectively. The nitrogen system outputs a control command signal to the DBB valve common box, energizing relay K3 and closing normally open contact K3-1. Since normally open contact K1-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in inert gas mode can the inert gas system control the DBB valve. The inert gas system outputs a control command signal to the DBB valve common box, energizing relay K4 and closing normally open contact K4-1. Since normally open contact K2-1 is already closed, the control command for the DBB valve is output through the DBB valve common box to control the air solenoid valve. Only when the selector switch is in nitrogen mode can the nitrogen system control the DBB valve.

6. The signal feedback box for the shared DBB valve according to claim 5, characterized in that: The contacts of relays K5, K6, K7, and K8 are all normally open contacts. The shared DBB valve feeds back the valve position status to the DBB common box. When relays K5, K6, K7, and K8 are energized, their normally open contacts close, sending the valve position feedback signal to the inert gas system and the nitrogen system.

7. The signal feedback box for the shared DBB valve according to claim 6, characterized in that: The contacts of relays K9 and K10 are both normally open contacts. When in nitrogen mode, the normally open contact K1-1 is closed. If the nitrogen pressure is at a normal value, relay K9 is energized, and the normally open contact of K9 closes, outputting a start signal to the liquid pump system. If the nitrogen pressure is low, relay K9 is de-energized, and the normally open contact of K9 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running. In inert gas mode, the normally open contact K2-1 is closed. If the nitrogen pressure is at a normal value, relay K10 is energized, and the normally open contact of K10 closes, outputting a start signal to the liquid pump system. If the inert gas pressure is low, relay K10 is de-energized, and the normally open contact of K10 returns to the open state from the previous closed state. At this time, the interlock signal between the DBB valve common box and the liquid pump system is disconnected, and the liquid pump stops running.

8. The signal feedback box for the shared DBB valve according to claim 7, characterized in that: It also includes terminal blocks and indicator lights.

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