Wide-temperature-range ice-resistant stern sealing device suitable for high-ice-grade pod propeller

Abstract

The invention relates to a wide-temperature-range ice-resistant stern sealing device suitable for a high-ice-grade pod propeller, a sealing pair between a sealing seat and a bushing is composed of a sealing element, the bushing and the sealing pair form a plurality of sealing cavities, the plurality of sealing cavities are connected with an air control device, and crushed ice can be prevented from entering the stern sealing device by melting and blowing the crushed ice through the air control device. When the wide-temperature-range ice-resistant stern sealing device works in a polar region ice breaking environment, the rubber seal has the high impact resistance characteristic, the sealing performance can be effectively guaranteed through a sealing pair formed by the rubber seal and the rotating shaft lining, and the air control device is arranged to melt and blow broken ice so that the broken ice can be prevented from entering the stern sealing device; when sailing in a tropical zone, the environment temperature is greatly increased, the size of the rubber seal is increased due to the thermal expansion effect, the holding force of a sealing pair formed by the rubber seal and the rotating shaft bushing is greatly reduced, at the moment, the pressure in each sealing cavity is adjusted through the air control device, the front-back pressure difference of the sealing pair is kept stable, and therefore the problem that the holding force is reduced is solved, and the sealing effectiveness is guaranteed.

Description

Technical Field

[0001] The invention relates to a ship propulsion system, in particular to a wide temperature range ice-resistant stern seal device for a high ice class pod thruster. Background Art

[0002] Conventional propeller propellers are still the first choice for polar heavy icebreakers. Their powerful power and mature key components have been verified by actual ships in polar environments. In particular, the stern tube sealing device has excellent sealing performance in polar environments. With the continuous development of integrated electric propulsion technology, high-ice-class pod propellers have gradually attracted the attention of polar heavy icebreakers. Currently, there are many types of polar icebreakers that use pod propellers. However, the existing stern tube sealing device cannot meet the wide temperature range working environment. The icebreaker has good sealing performance when working in the polar environment. Once it sails in the equatorial region, the stern seal device will leak. The main reason is that the seawater temperature may vary by 38°C in the polar environment and the equatorial tropical environment, which causes thermal deformation of the sealing element, resulting in insufficient clamping force between the sealing element and the shaft, causing leakage.

[0003] This requires that a wide temperature range and ice-resistant design be developed for the stern seal according to the global characteristics of the polar icebreaker working environment, so as to solve the leakage problem of the stern seal caused by the ambient temperature difference. Summary of the invention

[0004] The purpose of the present invention is to propose a wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters, which solves the problem of reduced sealing performance caused by large changes in ambient temperature of the stern seal device through the organic combination of rubber sealing elements and air control devices.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a wide temperature range ice-resistant stern sealing device suitable for high ice-class pod thrusters, including a sealing pair between a sealing seat body and a bushing, and an air control device. The sealing pair between the sealing seat body and the bushing is composed of a sealing element, and the sealing pair can effectively ensure the tightness between the pod body and the bushing; the bushing and the sealing pair form a plurality of sealing cavities, and the plurality of sealing cavities are connected to the air control device. The crushed ice can be prevented from entering the stern sealing device by melting and blowing the crushed ice through the air control device.

[0006] Furthermore, the sealing element adopts a rubber seal, and the number of the rubber seal is adjusted according to usage requirements.

[0007] Furthermore, the air control device is regulated by compressed air with controllable pressure and flow.

[0008] Furthermore, the air control device inputs compressed air with controllable pressure and flow into multiple sealing chambers to keep the front and rear pressure difference of the rubber seal stable, thereby solving the problem of leakage caused by insufficient clamping force of the rubber seal due to large dimensional deformation.

[0009] Furthermore, the air control device inputs compressed air at room temperature to purge and melt the crushed ice and ice chips near the stern sealing device, thereby preventing ice particles from entering the rubber seal of the stern sealing device and causing mechanical damage to the seal.

[0010] The beneficial effects of the present invention are:

[0011] By adopting the wide temperature range ice-resistant stern sealing device suitable for high ice-class pod thrusters of the present invention, when working in a polar icebreaking environment, the rubber seal has high impact resistance, and the sealing pair formed by the rubber seal and the rotating shaft bushing can effectively ensure tightness, and a gas control device is configured to melt and blow away the crushed ice to prevent the crushed ice from entering the stern sealing device; when sailing in tropical areas, the ambient temperature has greatly increased, and the rubber seal has become larger in size due to the thermal expansion effect, and the clamping force of the sealing pair formed by the rubber seal and the rotating shaft bushing is greatly reduced. At this time, the gas control device is used to adjust the pressure in the sealing cavity to keep the front and rear differential pressure of the rubber sealing element stable, thereby ensuring the clamping force and the tightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of a wide temperature range ice-resistant stern seal device suitable for a high ice class pod thruster according to the present invention. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0014] like Figure 1 As shown, a wide temperature range ice-resistant stern sealing device suitable for a high ice-class pod thruster of the present invention comprises a sealing pair between a rotating shaft and a bushing and an air control device. The sealing pair between the rotating shaft and the bushing is composed of a rubber sealing element, and the sealing pair can effectively ensure the tightness between the rotating shaft and the bushing; the sealing pair between the rotating shaft and the bushing forms a plurality of sealing cavities, and the plurality of sealing cavities are connected to the air control device, and the crushed ice can be prevented from entering the stern sealing device by melting and blowing the crushed ice through the air control device.

[0015] In view of the situation where the rubber seal causes large dimensional deformation due to the large change in ambient temperature between the polar regions and the equatorial regions, which leads to a significant decrease in the sealing performance of the stern sealing device, an air control device is used to keep the front and rear pressure difference of the rubber sealing element stable, thereby solving the problem of insufficient rubber seal holding force caused by large dimensional deformation and resulting in leakage.

[0016] The rubber seal has high impact resistance. The sealing pair formed by the rubber seal, the shaft and the bushing can effectively ensure the tightness. The air control device can melt and blow away the crushed ice to prevent the crushed ice from entering the stern sealing device.

[0017] The sealing elements adopt 1# to 7# rubber seals, and the number of the sealing elements can be adjusted according to the use requirements; the adjustment method adopts compressed air with controllable pressure and flow, that is, a pneumatic control device.

[0018] The air control device supplies compressed air to the sealing device chambers 1 to 5. The pressure of each chamber is set differently, so that the pressure difference before and after each seal is kept consistent (if there are more than 5 chambers, it is represented by chamber x). The pressure of each chamber is the superposition of the compressed air pressure and the gravity oil tank pressure. 腔2 The pressure is always the greatest, for P 腔1 Forming a positive pressure difference, P 腔2 -P 腔1 =ΔP 23 ≈0.03MPa~0.05MPa; P 腔2 >P 腔3 >P 腔4 >P 腔5 >P 腔x ;P 腔2 -P 腔3 =ΔP 23 , P 腔3 -P 腔4 =ΔP 34 , P 腔4 -P 腔5 =ΔP 45 , P 腔5 -P 腔x =ΔP 5x , the pressure difference ΔP is stable at 0.03MPa~0.05MPa. For pressure-resistant rubber seals, the pressure difference ΔP can be appropriately increased.

[0019] When working in polar environments, the gas control device mainly melts snow and blows away the air. It only needs to maintain a stable pressure gas supply in chambers 1 and 2 to maintain P 腔2 -P 腔1 =ΔP 23 ≈0.03MPa~0.05MPa; When sailing in tropical areas, the air control device needs to adjust the pressure difference of the sealing element. The air control device needs to supply air to chambers 1 to 5 at the same time to increase the basic pressure value of chambers 1 to 5 so that the pressure difference is within a reasonable range, avoid the thermal expansion effect caused by the ambient temperature, and keep the holding force of the sealing element within a reasonable range.

[0020] The air control device inputs normal temperature compressed air into chambers 1 to 5. The airflow passes through the 1# rubber seal and the 2# rubber seal and blows directly to the external seawater to blow and melt the broken ice and ice chips near the stern sealing device to prevent ice particles from entering the rubber seal of the stern sealing device.

Claims

1. A wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters, characterized by: It includes a sealing pair between the sealing seat body and the bushing, and an air control device. The sealing pair between the sealing seat body and the bushing is composed of a sealing element, and the sealing pair can effectively ensure the tightness between the rotating shaft and the bushing; the bushing and the sealing pair form a plurality of sealing cavities, and the plurality of sealing cavities are connected to the air control device. The air control device can melt and blow away the crushed ice to prevent the crushed ice from entering the stern sealing device.

2. The wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters according to claim 1, characterized in that: The sealing element adopts a rubber seal, and the number of the rubber seal is adjusted according to the use requirements.

3. The wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters according to claim 1, characterized in that: The air control device is regulated by compressed air with controllable pressure and flow.

4. The wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters according to claim 1, characterized in that: The air control device inputs compressed air with controllable pressure and flow into multiple sealing chambers to keep the front and rear pressure difference of the rubber seal stable, thereby solving the problem of leakage caused by insufficient holding force of the rubber seal due to large dimensional deformation.

5. The wide temperature range ice-resistant stern seal device suitable for high ice class pod thrusters according to claim 1, characterized in that: The air control device inputs compressed air at room temperature to blow and melt the crushed ice and ice chips near the stern sealing device to prevent ice particles from entering the rubber seal of the stern sealing device and causing mechanical damage to the seal.

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