Intelligent testing device and testing method for leakage rate of marine stern shaft sealing device

Abstract

The invention relates to the technical field of ship shafting design, in particular to an intelligent testing device and method for the leakage rate of a ship stern shaft sealing device. According to the intelligent testing device and method for the leakage rate of the marine stern shaft sealing device, the leakage rate data of the whole period of the stern shaft sealing device can be measured and stored in real time, the measurement precision is high, the state of the stern shaft sealing device can be analyzed and diagnosed conveniently, early warning can be provided for maintenance and repair of the stern shaft sealing device, and the service life of the stern shaft sealing device is prolonged. And data support can be provided for design optimization of the stern shaft sealing device.

Description

Technical Field

[0001] The invention relates to the technical field of ship shaft system design, and in particular to an intelligent leakage test device and a test method for a ship stern shaft sealing device. Background Art

[0002] The stern shaft seal is an important part of the ship's shaft system. Its function is to prevent seawater from penetrating into the cabin from the shaft system. The stern shaft seal is arranged near the stern of the ship's bottom hold. It is in direct contact with seawater and bears the pressure of seawater. It is not easy to observe its seawater leakage. If the leakage of the stern shaft seal exceeds the standard, it is easy to cause water accumulation in the stern cabin, causing corrosion of the shaft system and its accessories. In severe cases, it may even cause flooding in the cabin, threatening the safety of the entire ship. Therefore, monitoring the leakage of the stern shaft seal is crucial to the safe operation of the ship.

[0003] At present, the existing technology mainly uses the naked eye observation method and the steady-state measurement method to measure the leakage of the ship's stern shaft sealing device. The naked eye observation method mainly involves the crew regularly observing the seawater leakage of the stern shaft sealing device when the ship is running, and observing whether the leakage is dripping into a line; the steady-state measurement method, that is, when the sealing device is running stably, a measuring tool is used to collect the leaking seawater at the leakage port, and the leakage is recorded at regular intervals. The naked eye observation method and the steady-state measurement method are easy to operate and low in cost, but the automation level is low and the measurement accuracy is poor. Only the test personnel can record the data in real time on site, which cannot meet the needs of real-time monitoring. It is difficult to monitor and alarm the seawater leakage of the stern shaft sealing device at all times, and it is impossible to store the leakage data of the whole cycle, which is not conducive to the maintenance and early warning of the stern shaft sealing device, nor is it conducive to the optimization and improvement of the stern shaft sealing device, and it is easy to cause major flooding safety problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an intelligent testing device and method for leakage of a ship's stern shaft sealing device, which can solve the problem that the leakage of the existing ship's stern shaft sealing device cannot be accurately and real-time monitored and stored and analyzed, and is used to guide the maintenance and early warning of the stern shaft sealing device, as well as design optimization.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] 1. An intelligent test device for leakage of a marine stern shaft seal

[0007] The present invention provides an intelligent leakage test device for a marine stern shaft sealing device, which mainly comprises: a temporary storage container 1, wherein a leakage liquid inlet 2 and a leakage liquid outlet 3 are respectively arranged at the top and the bottom of the temporary storage container 1, wherein the leakage liquid inlet 2 is located directly below the leakage port of the marine stern shaft sealing device, wherein an inlet solenoid valve 4 and an outlet solenoid valve 5 are respectively installed at the leakage liquid inlet 2 and the leakage liquid outlet 3, wherein an ultrasonic liquid level meter 6 is also installed at the top of the temporary storage container 1, wherein the inlet solenoid valve 4, the outlet solenoid valve 5 and the ultrasonic liquid level meter 6 are all electrically connected to a PLC controller 8, and the PLC controller 8 is electrically connected to a leakage monitoring computer 9 in a ship control room.

[0008] Furthermore, a liquid level switch sensor 7 is provided at a preset liquid level height in the temporary storage container 1, and the liquid level switch sensor 7 is also electrically connected to the PLC controller.

[0009] Furthermore, the ultrasonic liquid level meter 6 is used to monitor the liquid level information in the temporary storage container 1 in real time, and send the liquid level information to the PLC controller 8 .

[0010] Furthermore, when the liquid level in the temporary storage container 1 reaches the preset liquid level height, the liquid level switch sensor 7 will be triggered, and the liquid level switch sensor 7 will send the triggered switch signal to the PLC controller 8.

[0011] Furthermore, the leakage monitoring computer 9 is used to receive, display and store the liquid level information transmitted by the PLC controller 8 in real time.

[0012] 2. A method for testing the leakage of a marine stern shaft seal

[0013] Based on the same inventive concept, the present invention also provides a method for testing the leakage of a marine stern shaft sealing device, based on the above-mentioned intelligent testing device for the leakage of a marine stern shaft sealing device, which specifically includes the following steps:

[0014] S1, the PLC controller issues an emptying command, drives the inlet solenoid valve to close and the outlet solenoid valve to open, and starts to discharge the remaining liquid in the temporary storage container. At the same time, the PLC controller starts the timer t;

[0015] S2, when the timer t reaches the preset time T0, the residual storage liquid in the temporary storage container has been emptied, and the PLC controller issues a start collection instruction to drive the inlet solenoid valve to open and the outlet solenoid valve to close, and the temporary storage container starts to collect the leaked liquid of the marine stern shaft sealing device;

[0016] S3, when the leaked liquid collected in the temporary storage container reaches the preset liquid level height h, the liquid level switch sensor is triggered, and the PLC controller issues a collection end instruction, driving the inlet solenoid valve to close and the outlet solenoid valve to open, and the temporary storage container begins to discharge the stored liquid. At the same time, the PLC controller records the current recorded time Tn, and the current measurement cycle ends;

[0017] S4, the PLC controller uploads the measurement time (Tn-T0) of the current measurement cycle to the leakage monitoring computer, and enters the next measurement cycle at the same time, repeating steps S1 to S4.

[0018] Furthermore, during the measurement cycle, the inlet solenoid valve and the outlet solenoid valve are interlocked.

[0019] Furthermore, within the measurement cycle, the preset time T0 is determined based on experimental measurements, specifically: filling the temporary storage container with water, then opening the outlet solenoid valve, and measuring the time required for the liquid in the temporary storage container to be emptied, recorded as T0.

[0020] Furthermore, the leakage monitoring computer calculates and determines the leakage rate v of the marine stern shaft sealing device in the current measurement cycle according to the measurement time (Tn-T0) and the preset liquid level height h, which is specifically as follows:

[0021]

[0022] Wherein, S is the cross-sectional area of ​​the temporary storage container.

[0023] Furthermore, the leakage monitoring computer records the leakage rate of the marine stern shaft sealing device in each measuring cycle in real time, and sends the recorded information to the ship shaft monitoring system and the fault diagnosis system.

[0024] Compared with the prior art, the present invention has the following main advantages:

[0025] The present invention provides an intelligent leakage test device and test method for a marine stern shaft sealing device, which can measure and store the leakage data of the stern shaft sealing device in real time throughout the entire cycle, and has high measurement accuracy, is convenient for analyzing and diagnosing the status of the stern shaft sealing device, can provide early warning for the maintenance, care and repair of the stern shaft sealing device, and can provide data support for the design optimization of the stern shaft sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a leakage liquid collection and measurement device in an embodiment of the present invention;

[0027] Figure 2 Schematic diagram of a leakage liquid measurement and control system in an embodiment of the present invention;

[0028] Figure 3 Flow chart of the measurement method in an embodiment of the present invention.

[0029] In the figure: 1-temporary storage container, 2-leaked liquid inlet, 3-leaked liquid outlet, 4-inlet solenoid valve, 5-outlet solenoid valve, 6-ultrasonic liquid level meter, 7-liquid level switch sensor, 8-PLC controller, 9-computer. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0031] It should be pointed out that, according to the needs of implementation, the various steps / components described in this application can be split into more steps / components, and two or more steps / components or partial operations of steps / components can be combined into new steps / components to achieve the purpose of the present invention.

[0032] Embodiment 1: This embodiment provides a marine stern shaft sealing device leakage intelligent testing device, such as Figures 1-2 As shown, it mainly includes: a temporary storage container 1, the top and bottom of the temporary storage container 1 are respectively provided with a leakage liquid inlet 2 and a leakage liquid outlet 3, the leakage liquid inlet 2 is located directly below the leakage port of the marine stern shaft sealing device, the leakage liquid inlet 2 and the leakage liquid outlet 3 are respectively installed with an inlet solenoid valve 4 and an outlet solenoid valve 5, an ultrasonic liquid level meter 6 is also installed on the top of the temporary storage container 1, the inlet solenoid valve 4, the outlet solenoid valve 5 and the ultrasonic liquid level meter 6 are all electrically connected to a PLC controller 8, and the PLC controller 8 is electrically connected to a leakage monitoring computer 9 in a ship control room.

[0033] Furthermore, a liquid level switch sensor 7 is provided at a preset liquid level height in the temporary storage container 1, and the liquid level switch sensor 7 is also electrically connected to the PLC controller.

[0034] Furthermore, the ultrasonic liquid level meter 6 is used to monitor the liquid level information in the temporary storage container 1 in real time, and send the liquid level information to the PLC controller 8 .

[0035] Furthermore, when the liquid level in the temporary storage container 1 reaches the preset liquid level height, the liquid level switch sensor 7 will be triggered, and the liquid level switch sensor 7 will send the triggered switch signal to the PLC controller 8.

[0036] Furthermore, the leakage monitoring computer 9 is used to receive, display and store the liquid level information transmitted by the PLC controller 8 in real time.

[0037] Embodiment 2: This embodiment provides an intelligent leakage test device for a marine stern shaft sealing device. During the measurement period, the inlet solenoid valve and the outlet solenoid valve are interlocked, that is, the two cannot be opened or closed at the same time.

[0038] Furthermore, in the intelligent testing device for leakage of the marine stern shaft sealing device, the opening time of the outlet solenoid valve is determined by experiment during the measurement period, that is, before the test, the temporary storage container is filled with water (the water level reaches a set height), the outlet solenoid valve is opened, and the time for the liquid in the temporary storage container to be emptied is measured, and this time is stored in the computer and the controller.

[0039] Furthermore, in the intelligent test device for leakage of a marine stern shaft sealing device, within a measurement cycle, the time of each measurement cycle is the sum of the opening time of the outlet solenoid valve and the opening time of the inlet solenoid valve.

[0040] Furthermore, in the marine stern shaft sealing device leakage intelligent testing device, in each test cycle, the ultrasonic level meter detects the liquid level of the temporary storage container in real time and transmits the liquid level information to the computer for display.

[0041] The present application can realize automatic testing of the leakage liquid of the stern shaft sealing device, and the data can be uploaded and saved in real time, which meets the need of the stern shaft sealing device monitoring system for real-time collection of the leakage liquid and facilitates the status analysis and fault diagnosis of the monitoring system.

[0042] Embodiment 3, based on the same inventive concept, this embodiment also provides a method for testing the leakage of a marine stern shaft sealing device, based on the above-mentioned intelligent testing device for the leakage of a marine stern shaft sealing device, such as Figure 3 As shown, the specific steps include:

[0043] S1, the PLC controller issues an emptying command, drives the inlet solenoid valve to close and the outlet solenoid valve to open, and starts to discharge the remaining liquid in the temporary storage container. At the same time, the PLC controller starts the timer t;

[0044] S2, when the timer t reaches the preset time T0, the residual storage liquid in the temporary storage container has been emptied, and the PLC controller issues a start collection instruction to drive the inlet solenoid valve to open and the outlet solenoid valve to close, and the temporary storage container starts to collect the leaked liquid of the marine stern shaft sealing device;

[0045] S3, when the leaked liquid collected in the temporary storage container reaches the preset liquid level height h, the liquid level switch sensor is triggered, and the PLC controller issues a collection end instruction, driving the inlet solenoid valve to close and the outlet solenoid valve to open, and the temporary storage container begins to discharge the stored liquid. At the same time, the PLC controller records the current recorded time Tn, and the current measurement cycle ends;

[0046] S4, the PLC controller uploads the measurement time (Tn-T0) of the current measurement cycle to the leakage monitoring computer, and enters the next measurement cycle at the same time, repeating steps S1 to S4.

[0047] Furthermore, during the measurement cycle, the inlet solenoid valve and the outlet solenoid valve are interlocked.

[0048] Furthermore, within the measurement cycle, the preset time T0 is determined based on experimental measurements, specifically: filling the temporary storage container with water, then opening the outlet solenoid valve, and measuring the time required for the liquid in the temporary storage container to be emptied, recorded as T0.

[0049] Furthermore, the leakage monitoring computer calculates and determines the leakage rate v of the marine stern shaft sealing device in the current measurement cycle according to the measurement time (Tn-T0) and the preset liquid level height h, which is specifically as follows:

[0050]

[0051] Wherein, S is the cross-sectional area of ​​the temporary storage container.

[0052] Furthermore, the leakage monitoring computer records the leakage rate of the marine stern shaft sealing device in each measuring cycle in real time, and sends the recorded information to the ship shaft monitoring system and the fault diagnosis system.

[0053] Embodiment 4: This embodiment provides a method for testing the leakage of a marine stern shaft sealing device, comprising:

[0054] Step 1: The PLC controller issues a command to drive the inlet solenoid valve to close and the outlet solenoid valve to open. The temporary storage container begins to discharge the original leaked liquid, and the PLC controller starts timing.

[0055] Step 2: When the timing reaches the opening time of the outlet solenoid valve, the leaked liquid in the container has been drained, and the PLC controller sends a command to drive the inlet solenoid valve to open and the outlet solenoid valve to close, and the temporary storage container begins to collect the leaked liquid.

[0056] Step 3: When the liquid level of the temporary storage container reaches the set height, the liquid level switch sensor outputs a switch signal to the PLC controller, and the PLC controller issues a control instruction to drive the inlet solenoid valve to close and the outlet solenoid valve to open, and the temporary storage container begins to drain. This measurement cycle ends.

[0057] Step 4: The PLC controller uploads the measurement time of this cycle to the computer for display, and enters the next measurement cycle, i.e. repeating steps 2, 3, and 4.

[0058] Furthermore, all parts involved in this application that are not described in detail are the same as the prior art or are implemented using the prior art.

[0059] In summary:

[0060] The present invention provides an intelligent leakage test device and test method for a marine stern shaft sealing device, which can measure and store the leakage data of the stern shaft sealing device in real time throughout the entire cycle, and has high measurement accuracy, is convenient for analyzing and diagnosing the status of the stern shaft sealing device, can provide early warning for the maintenance, care and repair of the stern shaft sealing device, and can provide data support for the design optimization of the stern shaft sealing device.

[0061] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An intelligent leakage test device for a marine stern shaft sealing device, characterized in that: The invention comprises a temporary storage container (1), wherein the top and bottom of the temporary storage container (1) are respectively provided with a leakage liquid inlet (2) and a leakage liquid outlet (3), wherein the leakage liquid inlet (2) is located directly below the leakage port of a marine stern shaft sealing device, and an inlet solenoid valve (4) and an outlet solenoid valve (5) are respectively installed at the leakage liquid inlet (2) and the leakage liquid outlet (3), and an ultrasonic liquid level meter (6) is also installed at the top of the temporary storage container (1), wherein the inlet solenoid valve (4), the outlet solenoid valve (5) and the ultrasonic liquid level meter (6) are all electrically connected to a PLC controller (8), and the PLC controller (8) is electrically connected to a leakage monitoring computer (9) in a ship control room.

2. The intelligent leakage test device for a marine stern shaft seal according to claim 1, characterized in that: A liquid level switch sensor (7) is provided at a preset liquid level height in the temporary storage container (1), and the liquid level switch sensor (7) is also electrically connected to the PLC controller.

3. The intelligent leakage test device for a marine stern shaft seal device according to claim 1, characterized in that: The ultrasonic liquid level meter (6) is used to monitor the liquid level information in the temporary storage container (1) in real time, and send the liquid level information to the PLC controller (8).

4. The intelligent leakage test device for a marine stern shaft sealing device according to claim 2 is characterized in that: When the liquid level in the temporary storage container (1) reaches the preset liquid level height, the liquid level switch sensor (7) is triggered, and at the same time, the liquid level switch sensor (7) sends the triggered switch signal to the PLC controller (8).

5. The intelligent leakage test device for a marine stern shaft seal device according to claim 4, characterized in that: The leakage monitoring computer (9) is used to receive the liquid level information transmitted by the PLC controller (8) in real time and to display and store it.

6. A method for testing leakage of a marine stern shaft sealing device, based on the intelligent testing device for leakage of a marine stern shaft sealing device according to any one of claims 1 to 5, characterized in that: The steps include: S1, the PLC controller issues an emptying command, drives the inlet solenoid valve to close and the outlet solenoid valve to open, and starts to discharge the remaining liquid in the temporary storage container. At the same time, the PLC controller starts the timer t; S2, when the timer t reaches the preset time T0, the residual storage liquid in the temporary storage container has been emptied, and the PLC controller issues a start collection instruction to drive the inlet solenoid valve to open and the outlet solenoid valve to close, and the temporary storage container starts to collect the leaked liquid of the marine stern shaft sealing device; S3, when the leaked liquid collected in the temporary storage container reaches the preset liquid level height h, the liquid level switch sensor is triggered, and the PLC controller issues a collection end instruction, driving the inlet solenoid valve to close and the outlet solenoid valve to open, and the temporary storage container begins to discharge the stored liquid. At the same time, the PLC controller records the current recorded time Tn, and the current measurement cycle ends; S4, the PLC controller uploads the measurement time (Tn-T0) of the current measurement cycle to the leakage monitoring computer, and enters the next measurement cycle at the same time, repeating steps S1 to S4.

7. The testing method according to claim 6, characterized in that: During the measurement cycle, the inlet solenoid valve and the outlet solenoid valve are interlocked.

8. The testing method according to claim 6, characterized in that: In the measurement cycle, the preset time T0 is determined according to experimental measurement, specifically: fill the temporary storage container with water, then open the outlet solenoid valve, and measure the time required for the liquid in the temporary storage container to be emptied, which is recorded as T0.

9. The testing method according to claim 8, characterized in that: The leakage monitoring computer calculates and determines the leakage rate v of the marine stern shaft sealing device in the current measurement cycle according to the measurement time (Tn-T0) and the preset liquid level height h, which is specifically as follows: Wherein, S is the cross-sectional area of ​​the temporary storage container.

10. The testing method according to claim 9, characterized in that: The leakage monitoring computer records the leakage rate of the marine stern shaft sealing device in real time during each measurement cycle, and sends the recorded information to the ship shaft monitoring system and the fault diagnosis system.

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