A container ship stern tube sealing system

Abstract

The present invention provides a container ship stern tube sealing system, including a ship draft gauge pressure monitoring unit, a valve pressure control unit and a stern tube sealing pressure execution unit, the ship draft gauge pressure monitoring unit is connected to the valve pressure control unit, the valve pressure control unit is connected to the stern tube sealing pressure execution unit, the ship draft gauge pressure monitoring unit is used to monitor the draft pressure signal, the valve pressure control unit is used to receive the draft pressure signal and the air pressure signal and control the action of the stern tube sealing pressure execution unit, and the stern tube sealing pressure execution unit controls the air pressure and oil pressure in the system to a preset value through a corresponding valve group. The ship draft indicator adopted by the present invention does not need to be purchased separately, and the cost is low. The stern tube air sealing system dynamically adjusted according to the ship draft pressure controls the air pressure and oil pressure difference and improves the service life of the sealing ring. At the same time, when the air seal fails, the stern shaft seal can still automatically operate normally, which increases the reliability of the system.

Description

Technical Field

[0001] The invention relates to the technical field of ship stern shaft sealing, and in particular to a container ship stern tube sealing system. Background Art

[0002] The ship's stern seal is one of the key components of the ship's shaft system. Its performance directly affects the normal operation of the ship's propulsion device. A seal with superior performance can ensure reliable ship propulsion, which is of great significance for preventing ship pollution and protecting the ocean. In recent years, considering environmental protection and performance, a large number of gas seals have been used for ship stern seals. However, gas seals have the following defects:

[0003] The stern tube sealing system in the prior art must be equipped with an air control unit, which is a set of equipment assembly for precisely controlling the stern tube sealing air flow, and the procurement cost is very high.

[0004] The stern tube sealing system in the prior art cannot continue to operate normally when the air system fails, and the system reliability is low. Summary of the invention

[0005] According to the above technical problems, a container ship stern tube sealing system is provided. The technical means adopted by the present invention are as follows:

[0006] A container ship stern tube sealing system comprises a ship draft gauge pressure monitoring unit, a valve pressure control unit and a stern tube sealing pressure execution unit, wherein the ship draft gauge pressure monitoring unit is connected to the valve pressure control unit, and the valve pressure control unit is connected to the stern tube sealing pressure execution unit, the ship draft gauge pressure monitoring unit is used to monitor the draft pressure signal, the valve pressure control unit is used to receive the draft pressure signal and the air pressure signal and control the action of the stern tube sealing pressure execution unit, and the stern tube sealing pressure execution unit controls the air pressure and oil pressure in the system to preset values ​​through the corresponding valve group.

[0007] Further, the stern tube sealing pressure execution unit includes a stern tube sealing air pressure control valve, a stern tube oil tank pressure control valve, a stern tube lubricating oil back pressure control valve, a stern tube lubricating oil tank, a stern tube lubricating oil pump, a stern tube lubricating oil cavity and a stern tube air sealing cavity, the stern tube oil tank pressure control valve is connected to the stern tube lubricating oil tank, the stern tube lubricating oil pump is connected to the stern tube lubricating oil tank, the stern tube lubricating oil tank is connected to the stern tube lubricating oil cavity through the stern tube lubricating oil back pressure control valve, the valve pressure control unit is connected to the stern tube sealing air pressure control valve, the stern tube oil tank pressure control valve, and the stern tube lubricating oil back pressure control valve; the valve pressure control unit is also connected to the stern tube air sealing cavity through the stern sealing air pressure control valve.

[0008] Furthermore, the stern seal air pressure control valve obtains the stern tube air seal cavity pressure based on the acquired draft pressure parameter P1 of the draft gauge pressure monitoring unit and the reserved pressure difference constant Pc3, that is, the control parameter P3=P1+Pc3 of the stern seal air pressure control valve.

[0009] Further, the pressure control parameter P4 of the stern tube oil tank pressure control valve is obtained based on the control parameter P3 of the stern seal air pressure control valve, the outlet pressure P7 when there is no air pressure, and the reserved pressure difference constant Pc4, specifically: P4=P3-Pc4-P7.

[0010] Furthermore, when the air seal fails, the system composed of the ship's draft gauge pressure monitoring unit, valve pressure control unit, stern tube lubricating oil back pressure control valve, stern tube lubricating oil cabinet, stern tube lubricating oil pump, and stern tube lubricating oil cavity ensures the normal operation of the stern tube seal.

[0011] Furthermore, after the valve pressure control unit receives the air pressure failure signal through the air pressure signal feedback line, it reduces the opening of the stern tube lubricating oil back pressure control valve according to the draft information of the ship's draft gauge pressure monitoring unit, thereby increasing the oil pressure in the stern tube lubricating oil chamber, and avoiding stern tube seal leakage caused by pressure loss in the stern tube air seal chamber through oil pressure compensation.

[0012] The ship draft indicator used in the present invention is a device that the ship itself must carry, and there is no need to purchase it separately. The present invention can realize a stern tube air seal system that is dynamically adjusted according to the ship's draft pressure, control the difference between air pressure and oil pressure, and increase the service life of the sealing ring. Through the design of joint control of each valve in the ship draft meter, valve pressure control unit and stern tube sealing pressure execution unit, the air control unit that should exist in the system is replaced. The air control unit is a set of equipment assembly that accurately controls the stern tube sealing air flow, and the procurement cost is very high. The present invention reduces the manufacturing cost. By using the valve pressure control unit to control the design of the stern tube lubricating oil back pressure control valve, when the air seal fails, the stern shaft seal can still automatically operate normally, thereby increasing the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a schematic diagram of the system of the present invention.

[0015] In the figure: 1. Ship draft gauge pressure monitoring unit; 2. Valve pressure control unit; 3. Stern seal air pressure control valve; 4. Stern tube oil tank pressure control valve; 5. Stern tube lubricating oil back pressure control valve; 6. Stern tube lubricating oil tank; 7. Stern tube lubricating oil pump; 8. Stern tube lubricating oil cavity; 9. Stern tube air seal cavity; 10. Stern tube seal pressure execution unit. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] The present invention aims to design a stern tube sealing system that replaces the air control unit, and directly adjusts the stern tube air seal pressure by feeding back the draft signal from the ship's draft gauge, thereby replacing the air control unit that must be equipped in the stern tube sealing system in the prior art; and the present invention designs a technical solution for automatically making the stern tube sealing system operate normally when the air seal fails. Specifically, Figure 1 As shown, an embodiment of the present invention discloses a container ship stern tube sealing system, including a ship draft gauge pressure monitoring unit 1, a valve pressure control unit 2 and a stern tube sealing pressure execution unit 10, wherein the ship draft gauge pressure monitoring unit is connected to the valve pressure control unit, and the valve pressure control unit is connected to the stern tube sealing pressure execution unit, the ship draft gauge pressure monitoring unit is used to monitor the draft pressure signal, the valve pressure control unit is used to receive the draft pressure signal and the air pressure signal and control the action of the stern tube sealing pressure execution unit, and the stern tube sealing pressure execution unit controls the air pressure and oil pressure in the system to preset values ​​through the corresponding valve group.

[0018] The stern tube sealing pressure execution unit includes a stern tube sealing air pressure control valve 3, a stern tube oil tank pressure control valve 4, a stern tube lubricating oil back pressure control valve 5, a stern tube lubricating oil tank 6, a stern tube lubricating oil pump 7, a stern tube lubricating oil cavity 8 and a stern tube air sealing cavity 9. The stern tube oil tank pressure control valve is connected to the stern tube lubricating oil tank, the stern tube lubricating oil pump is connected to the stern tube lubricating oil tank, the stern tube lubricating oil tank is connected to the stern tube lubricating oil cavity through the stern tube lubricating oil back pressure control valve, the valve pressure control unit is connected to the stern tube sealing air pressure control valve, the stern tube oil tank pressure control valve and the stern tube lubricating oil back pressure control valve; the valve pressure control unit is also connected to the stern tube air sealing cavity through the stern sealing air pressure control valve.

[0019] The stern seal air pressure control valve obtains the stern tube air seal cavity pressure based on the acquired draft pressure parameter P1 of the draft gauge pressure monitoring unit and the reserved pressure difference constant Pc3, that is, the control parameter P3=P1+Pc3 of the stern seal air pressure control valve.

[0020] The pressure control parameter P4 of the stern tube oil tank pressure control valve is obtained based on the control parameter P3 of the stern seal air pressure control valve, the outlet pressure P7 when there is no air pressure, and the reserved pressure difference constant Pc4, specifically: P4 = P3-Pc4-P7.

[0021] When the gas seal fails, the system composed of the ship's draft gauge pressure monitoring unit, valve pressure control unit, stern tube lubricating oil back pressure control valve, stern tube lubricating oil cabinet, stern tube lubricating oil pump and stern tube lubricating oil cavity ensures the normal operation of the stern tube seal.

[0022] After the air seal fails, the valve pressure control unit receives the air pressure failure signal through the air pressure signal feedback line, and reduces the opening of the stern tube lubricating oil back pressure control valve according to the draft information of the ship's draft gauge pressure monitoring unit, thereby increasing the oil pressure in the stern tube lubricating oil chamber, and avoiding stern tube seal leakage caused by pressure loss in the stern tube air seal chamber by compensating with the oil pressure.

[0023] In summary, the ship's draft gauge is a device that the ship must carry, and there is no need to purchase it separately. The present invention eliminates the air control unit that must be installed in the stern tube sealing system in the prior art, greatly reducing the manufacturing cost of the ship's stern tube sealing system. By using the valve pressure control unit to control the design of the stern tube lubricating oil back pressure control valve, when the air seal fails, the stern shaft seal can still automatically operate normally, increasing the reliability of the system.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A container ship stern tube sealing system, characterized in that: It includes a ship draft gauge pressure monitoring unit, a valve pressure control unit and a stern tube sealing pressure execution unit, wherein the ship draft gauge pressure monitoring unit is connected to the valve pressure control unit, and the valve pressure control unit is connected to the stern tube sealing pressure execution unit, wherein the ship draft gauge pressure monitoring unit is used to monitor the draft pressure signal, and the valve pressure control unit is used to receive the draft pressure signal and the air pressure signal and control the action of the stern tube sealing pressure execution unit, and the stern tube sealing pressure execution unit controls the air pressure and oil pressure in the system to a preset value through a corresponding valve group; The stern tube sealing pressure execution unit includes a stern tube sealing air pressure control valve, a stern tube oil tank pressure control valve, a stern tube lubricating oil back pressure control valve, a stern tube lubricating oil tank, a stern tube lubricating oil pump, a stern tube lubricating oil cavity and a stern tube air sealing cavity. The stern tube oil tank pressure control valve is connected to the stern tube lubricating oil tank, the stern tube lubricating oil pump is connected to the stern tube lubricating oil tank, the stern tube lubricating oil tank is connected to the stern tube lubricating oil cavity through the stern tube lubricating oil back pressure control valve, the valve pressure control unit is connected to the stern tube sealing air pressure control valve, the stern tube oil tank pressure control valve and the stern tube lubricating oil back pressure control valve; the valve pressure control unit is also connected to the stern tube air sealing cavity through the stern sealing air pressure control valve.

2. The container ship stern tube sealing system according to claim 1, characterized in that: The stern seal air pressure control valve obtains the stern tube air seal cavity pressure based on the acquired draft pressure parameter P1 of the draft gauge pressure monitoring unit and the reserved pressure difference constant Pc3, that is, the control parameter P3=P1+Pc3 of the stern seal air pressure control valve.

3. The container ship stern tube sealing system according to claim 1, characterized in that: The pressure control parameter P4 of the stern tube oil tank pressure control valve is obtained based on the control parameter P3 of the stern seal air pressure control valve, the outlet pressure P7 when there is no air pressure, and the reserved pressure difference constant Pc4, specifically: P4 = P3-Pc4-P7.

4. The container ship stern tube sealing system according to claim 1, characterized in that: When the gas seal fails, the system composed of the ship's draft gauge pressure monitoring unit, valve pressure control unit, stern tube lubricating oil back pressure control valve, stern tube lubricating oil cabinet, stern tube lubricating oil pump and stern tube lubricating oil cavity ensures the normal operation of the stern tube seal.

5. The container ship stern tube sealing system according to claim 1 or 4, characterized in that: After the valve pressure control unit receives the air pressure failure signal through the air pressure signal feedback line, it reduces the opening of the stern tube lubricating oil back pressure control valve according to the draft information of the ship's draft gauge pressure monitoring unit, thereby increasing the oil pressure in the stern tube lubricating oil chamber, and avoids stern tube seal leakage caused by pressure loss in the stern tube air seal chamber by supplementing the oil pressure.

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