JPH058235Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to the structure of an elevating type thruster, and particularly relates to the structure around a seal portion provided for a water sealing cylinder of an elevating type thruster.

(Prior art) Figure 3 shows the structure of a conventional lifting thruster.
It has a structure that transmits power from a motor 1 to a propeller 5 via an input shaft 2, a bevel gear 3, and a propeller shaft 4 to generate thrust. A seal 6 separates the outside and inside of the ship. When the thruster is not in use, it is pulled upward by a pair of hydraulic cylinders 7, 7 and stored in a room 8 provided outside the hull.

In general, the seal 6 is often damaged, and one of the reasons for this is that there is almost no water flow inside the chamber 8, and as a result, shells such as barnacles and oysters adhere to the surface of the water seal tube 9. The problem is that the water seal cylinder 9 moves up and down with these shells still attached, and the inner surface of the seal 6 is rubbed each time. If the seal 6 is damaged by abrasion, there is a problem that the ship must be put in a dock each time for repairs because there is no other means to prevent water from entering from outside the ship, which increases costs. Ta.

(Purpose of the invention) This invention was made to solve the above problems, and it significantly reduces damage to the sliding surface of the seal provided for the water seal cylinder and prevents water from entering through the seal. This reduces the frequency of docking for seal repair, and by activating the spare seal, replacement of damaged seals can be carried out from inside the ship while the ship is underway, reducing the number of dockings. However, the purpose of this invention is to provide a structure for an elevating thruster that can reduce maintenance costs.

Another object of the present invention is to provide a structure for an elevating thruster that can predict the onset of seal damage and automatically activate corresponding measures to prevent damage.

(Structure of the invention) As a means to achieve the above object, this invention is an elevating type thruster in which the propeller section can be moved upward and stored by an elevating device, and is provided with a propeller that faces the outer circumferential surface of the water seal cylinder that is being raised and lowered. There is a small gap between the permanent seal that is installed and always seals out the water outside the boat, and the outer circumferential surface of the water seal cylinder at a position closer to the water outside the boat than that seal. Installation Now, if necessary, install a preliminary seal to seal the water outside the vessel.The preliminary seal eliminates the slight gap mentioned above by introducing pressure fluid from the outside, and seals the outer circumferential surface of the facing water seal cylinder. It is made of a hollow elastic material that can be elastically deformed when pressed in the direction of close contact.

Alternatively, a pressure sensor is installed inside the ship of the permanent seal to detect changes in water pressure that occur inside the ship in response to deterioration of the sealing function of the seal,
An on-off valve is provided in the middle of a fluid pressure line for conducting pressure fluid to the preliminary seal, and the pressure sensor and the on-off valve are electrically connected to control opening and closing according to the detected value of the pressure sensor. Accordingly, the sealing function of the preliminary seal may be automatically increased or decreased.

(Function) According to the structure set forth in claim (1), in addition to the regular seal that always seals the water outside the ship, there is a preliminary seal made of a hollow elastic material that is separately provided at a position closer to the water outside the ship than this seal. On the other hand, when pressure fluid is applied from the outside, the preliminary seal undergoes elastic deformation and is pressed against the opposing circumferential surface of the water seal cylinder, making a tight contact with it.
Demonstrates sealing function. That is, the sealing function of this preliminary seal can be activated or stopped as needed. Moreover, the installation position of the spare seal is closer to the water outside the vessel than the above-mentioned regular seal, so to speak, it is a seal located on the outside, so the spare seal can be used to replace the above-mentioned regular seal. Alternatively, it is possible to enhance the overall sealing function by using both seals in combination.

Furthermore, when the sealing function of a regularly provided seal deteriorates due to wear or the like, a change in water pressure occurs on the inside of the seal, but with the structure of claim (2),
A pressure sensor will be installed to detect this change in water pressure. On the other hand, according to the configuration in the same section, an on-off valve is provided in the middle of the fluid pressure line for conducting pressure fluid to the preliminary seal, and the pressure sensor and the on-off valve are electrically connected, so the opening of the on-off valve is is controlled by the water pressure change value, and as a result, the contribution of the spare seal to the sealing function to compensate for the functional deterioration of the regular seal is always automatically maintained at an appropriate value according to the progress of deterioration of the regular seal. be able to.

(Example) Next, an example of this invention will be described in detail based on the drawings. 1 and 2, the same reference numerals as those used in FIG. 1 indicate the same members as in the same figure. 10
is a water-sealing cylinder, which is constructed separately from the rotating cylinder 11 which is integrally connected to the propeller section. 12 is a rotating cylinder 11
13 is a seal for the water seal cylinder 10, which is interposed between the water seal cylinder 10 and the turning cylinder 11, and 13 is a seal for the water seal cylinder 10, which is interposed between the hull A and the water seal cylinder 10.

Reference numeral 14 denotes a preliminary seal, and the preliminary seal 14 is provided on a side closer to the water outside the vessel than the seal 13. The preliminary seal 14 is made of a hollow elastic material and has a ring shape.
When the pneumatic pressure of the pneumatic line 15 is conducted toward the tank, the preliminary seal 14 expands inward, and the protrusion 14c is pressed against the outer circumferential surface of the water-sealing tube 10 without any gaps, achieving a complete sealing state.
When the air pressure is cut off, the preliminary seal 14 returns to its old state due to its elasticity, and the contact with the water seal cylinder 10 is released, creating a gap between the two again.

16 is an on-off valve provided in the middle of the pneumatic line 15, and 17 is a pressure sensor provided in the packing portion of the seal 13. The on-off valve 16 and the pressure sensor 17 are electrically connected, and the opening and closing of the on-off valve 16 is controlled according to the detected value of the pressure sensor 17. Reference numeral 18 denotes a cutter, which is provided on the side of the seal portion closest to the water outside the boat, leaving a very small gap between it and the outer peripheral surface of the water seal cylinder 10. The cutter 18 is for scraping off shells, dust, etc. adhering to the circumferential surface of the water sealing cylinder 10 when the water sealing cylinder 10 moves up and down, thereby preventing damage to the inner surface of the seal 13 or the preliminary seal 14. Reference numeral 19 denotes a lifting guide which moves up and down integrally with the water seal cylinder 10 to guide smooth lifting and lowering movements. Reference numeral 20 denotes a turning motor for turning the turning tube 11 inside the water sealing tube 10 and freely changing the direction of the thrust of the propeller 5.

Next, the usage condition of the sealing device configured in this way will be explained. In principle, it is the water sealing tube 10 that gives the preliminary seal 14 a sealing effect.
shall be limited to when it is not necessary for lifting/lowering operations,
The sealing function when the water-sealing tube 10 moves up and down is shared by the conventional seal 13, and in this case, the preliminary seal 14 is left with a gap between it and the circumferential surface of the water-sealing tube. shall be taken as a thing.

Under such usage conditions, if the seal 13 is gradually damaged and its sealing function deteriorates, water pressure will be generated in the seal portion of the seal 13. At this time, the pressure sensor 17 detects the water pressure and instructs the on-off valve 16 to conduct the air pressure, so that the air pressure is conducted to the preliminary seal 14 and the preliminary seal 14
The sealing is done completely automatically. As a result, the gasket inside the seal 13 can be replaced freely from inside the ship, so there is no need to bring the ship into dock for seal repair work.

Furthermore, if the opening/closing operation of the on-off valve 16 is set to be controlled by a command from the control stand in addition to the command system from the pressure sensor 17, the propeller will be controlled depending on the operating status of the ship. It is extremely useful to use this device as a two-stage sealing device in which the preliminary seal 14 is opened only when the vehicle is going up and down, leaving a gap, and the preliminary seal 14 provides a complete seal during flight operations that do not involve any up and down movement. It is easily achievable.

(Effects of the invention) The elevating type thruster according to the invention has the above-mentioned configuration and exhibits the following effects.

A. According to the structure set forth in claim (1), in addition to the regular seal, a spare seal that can perform a sealing function whenever necessary is provided at a position closer to the water outside the ship than the regular seal. Therefore, by using the spare seals, the work of replacing the standing seals can be done without having to dock the ship.
This can be easily carried out from inside the ship while underway.

In addition, by using the standing seal and the spare seal in combination, it is possible to enhance the overall sealing function.

B According to the structure set forth in claim (2), the pressure sensor installed on the inside of the regular seal and the on-off valve installed in the middle of the preliminary seal fluid pressure line are electrically connected. The degree of opening is controlled by the change value of the water pressure, and as a result, the necessary amount of assistance for the sealing function of the standby seal to compensate for the deterioration of the function of the standby seal is always automatically guaranteed in accordance with the progress of deterioration of the standby seal. be able to.

[Brief explanation of the drawing]

Fig. 1 is an overall layout showing an embodiment of the present device as a sectional view, Fig. 2 is an enlarged sectional view showing the part in Fig. 1, and Fig. 3 is an overall layout showing a conventional device as a sectional view. It is a diagram. 1...Motor, 2...Input shaft, 3...Bevel gear, 4...Propeller shaft, 5...Propeller, 6,1
2, 13...Seal, 7...Hydraulic cylinder, 8...
...Room, 9,10...Water seal cylinder, 11...Swivel cylinder,
14... Spare seal, 14a... Entrance/exit, 14b
...Hollow part, 14c...Protrusion, 15...Pneumatic pressure line, 16...Opening/closing valve, 17...Pressure sensor,
18...Cutter, 19...Elevating guide, 20...Swivel motor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an elevating type thruster in which the propeller section can be moved upward and retracted using an elevating device, it is installed facing the outer circumferential surface of a water seal cylinder that is raised and lowered, and is constantly A permanent seal is installed at a position closer to the water outside the vessel, with a slight gap between it and the outer circumferential surface of the water-sealing tube, and is installed as needed. A preliminary seal is provided to seal the water outside the vessel, and the preliminary seal is pressed in a direction in which the above-mentioned slight gap disappears by conducting pressure fluid from the outside and tightly contacts the outer circumferential surface of the opposing water seal cylinder. The structure of an elevating thruster is characterized in that it is made of a hollow elastic material that can be elastically deformed. (2) A pressure sensor is installed on the inside of the regular seal to detect changes in water pressure that occur inside the ship in response to deterioration of the sealing function of the seal, and a fluid is installed to conduct pressure fluid to the preliminary seal. By installing an on-off valve in the middle of the pressure line, electrically connecting the pressure sensor and the on-off valve, and controlling the opening and closing of the on-off valve according to the detected value of the pressure sensor, the sealing function of the preliminary seal can be increased or decreased. The structure of an elevating thruster according to claim (1) of the utility model registration that automatically performs the following steps.