JP2518427Y2 - Rope guard for marine counter-rotating propeller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a rope guard for a contra-rotating propeller for a ship, and in particular, there is no concern about electrochemical corrosion and fishing nets, ropes, etc. floating in water. The present invention relates to a rope guard for a contra-rotating propeller for a marine vessel, which reliably prevents the suspended matter from being wrapped around the sealing device of the propeller shaft.

[Conventional technology]

First, a conventional rope guard for a marine counter-rotating propeller will be described.

In FIG. 3 (a), an inner shaft 1'for driving a rear propeller 9'and an outer shaft 2'for driving a front propeller 6'are interlocked with each other via a reversing gear device (not shown) and are the same. It is configured to rotate in opposite directions on the axis. Between the hull 3'and the front propeller 6 ', on the hull 3'side, an annular outer shaft seal device 5'is provided.
The front end edge portion of the annular rope guard 4'for the outer shaft for protecting the vehicle is fixed, and between the front propeller 6'and the rear propeller 9 ', on the front propeller 6'side, an annular inner A front end edge portion of an annular inner shaft rope guard 7'for protecting the shaft sealing device 8'is fixed.

As shown in FIGS. 3 (b) and 3 (c), a plurality of cutout holes are formed in the front end edge portion of the inner shaft rope guard 7'at appropriate intervals in the circumferential direction. The flange portion formed along the front end edge of the inner shaft rope guard 7'is fixed to the hub portion side of the front propeller 6'by using the mounting bolt 10 'by utilizing the notch hole.

The rope guards 4 ', 7'are provided with sealing devices 5', 8'to prevent floating substances such as fishing nets and ropes floating in water from being wound around the rotating sealing devices 5 ', 8'. It is for protecting the steel sheet and is usually formed of a steel plate.

4 and 5 show a conventional rope guard different from that shown in FIG. Between the hull 3'and the hub portion 15 'of the propeller, one end edge of an annular rope guard 12' for protecting the annular sealing device 11 'is fixed to the hull 3'side, and the rope guard An annular gap is formed between the other end edge of 12 'and the hub portion 15' of the propeller so as not to hinder the rotation of the propeller. Then, from these gaps, in order to prevent a fine floating substance such as a fishing net which cannot be prevented by the rope guard 12 ′ from entering the inside and being wound around the sealing device 11 ′ and causing a problem in the sealing device 11 ′, For example, a net protector 14 'that projects annularly outward in the radial direction as shown in FIG. 4 or a net protector 13' that projects annularly in the axial direction as shown in FIG. 5 should be provided on the hub portion 15 'side of the propeller. There are many.

[Problems to be solved by the device]

By the way, in the conventional marine contra-rotating propeller rope guard, in the case of the outer shaft rope guard, since the steel rope guard is attached to the cast iron hull by bolts, the electrochemical No major corrosion problems will occur.

However, in the case of the rope guard for the inner shaft, the propeller is usually made of a copper alloy such as nickel aluminum bronze, so a steel rope guard is attached to the propeller made of a copper alloy. An electrochemical reaction occurs in the rope guard, causing the rope guard to corrode and break, and as a result, the protective function of the sealing device cannot be fulfilled.

Therefore, if the inner shaft rope guard is made of copper alloy as with the propeller, the problem of electrochemical corrosion can be solved,
The rope guard must be manufactured by casting or attached to the propeller by brazing, which complicates the machining work and significantly deteriorates the workability.

On the other hand, since there is an annular gap between the free end of the rope guard and the propeller or net protector, fine floating substances such as fishing nets may enter through this gap and damage the sealing device.

In view of the above-mentioned circumstances, the main purpose of the present invention is to provide a marine counter-rotating propeller that does not worry about electrochemical corrosion and that can prevent the intrusion of even fine floating substances such as fishing nets. To provide rope guards.

[Means for solving the problem]

In order to achieve the above object, the rope guard of the contra-rotating propeller for marine vessels of the present invention is formed of a fiber reinforced synthetic resin, and has a sealing device between a front propeller and a rear propeller that rotate in opposite directions on the same axis. The base end edge portion is fixed to the hub portion of the front propeller so as to cover the annular portion, and the inner peripheral surface side is formed on the outer peripheral surface of the annular net protector fixed to the hub portion of the rear propeller. Is formed with an annular concave groove aligned with the convex stripe of the rear end of the rear propeller, and an annular L-shaped cutout is formed in the inner shoulder portion on the leading edge side, which is aligned with the annular L-shaped cutout formed in the shoulder portion of the hub portion of the rear propeller. The feature is that a notch is formed.

[Action]

In the above-mentioned rope guard of the contra-rotating propeller for the present invention, since the material of the rope guard is fiber reinforced synthetic resin, an electrochemical reaction occurs between the rope guard and the propeller to which the rope guard is fixed. It does not occur and no electrochemical corrosion occurs on the rope guard.

The rope guard is fixed to the hub portion of the front propeller on the base edge side so as to annularly cover the sealing device between the front propeller and the rear propeller, and the annular groove formed on the inner peripheral surface side. Is arranged in alignment with an annular ridge protruding to the outer peripheral surface side of the annular net protector fixed to the hub portion of the other propeller, and is also formed in the inner shoulder portion on the tip edge side. Since the L-shaped notch is formed to match the annular L-shaped notch formed in the shoulder of the hub portion of the rear propeller, the rope guard allows the floating device such as fishing nets and ropes to enter the sealing device. Even if it is a floating material such as a fine fishing net that tries to enter the inside through the annular gap between the rope guard and the propeller, it is prevented from being wrapped around, and the inner shoulder portion on the tip edge side of the rope guard is particularly important. Formed on And the annular L-shaped notch formed in the shoulder portion of the hub of the rear propeller with a complicated longitudinal cross-section, and an annular recess on the inner peripheral surface of the guard. Further intrusion is prevented in the gap with a complicated vertical cross section formed by the groove and the annular ridge protruding to the outer peripheral surface side of the net protector fixed to the propeller side, and the sealing device floats in the outside world. Well protected from things.

〔Example〕

Hereinafter, a rope guard for a marine counter-rotating propeller according to an embodiment of the present invention will be described with reference to the drawings.

First, in FIG. 1, an inner shaft 1 that rotationally drives a rear propeller 9 and an outer shaft 2 that rotationally drives a front propeller 6 are
Interlocking with each other via a reversing gear device (not shown),
It is configured to rotate in opposite directions on the same axis.

Between the hull 3 and the front propeller 6, on the hull 3 side, a front end edge portion of an annular outer shaft rope guard 4 for protecting the annular outer shaft sealing device 5 is fixed, and the front propeller is also provided. Between 6 and the rear propeller 9,
On the front propeller 6 side, a front end edge portion of an annular inner shaft rope guard 7 for protecting the annular inner shaft sealing device 8 is provided.
It is fixed by mounting bolts 10.

In FIG. 2, the inner shaft rope guard 7 whose one end edge side is fixed to the hub portion of the front propeller 6 is made of fiber reinforced synthetic resin (FRP), and extends in the radial direction along the end edge on the front propeller 6 side. It has a flange protruding outward, and is attached to the hub portion of the propeller 6 by utilizing this flange.

An annular groove is formed on the inner peripheral surface side of the inner shaft rope guard 7, and the groove is an annular net protector 11 having a cylindrical side wall portion fixed to the hub portion of the rear propeller 9. Are arranged so as to be in alignment with an annular ridge protruding toward the outer peripheral surface side.

Along the free end edge of the rope guard 7 for the inner shaft, an L-shaped annular cutout having a vertical cross-sectional shape is further formed in the inner shoulder, and the L-shaped shoulder cutout is formed in the rear propeller 9. Aligned with an annular L-shaped notch formed in the corresponding shoulder of the hub.

Since the inner shaft rope guard 7 is made of fiber reinforced synthetic resin, an electrochemical reaction does not occur between the inner shaft rope guard 7 and the front propeller 6, so that the inner shaft rope guard 7 is electrochemically corroded. There is no.

Further, since the inner shaft rope guard 7 is made of fiber reinforced synthetic resin, it is relatively lightweight and easy to process. For this reason, it is easy to assemble and remove the inner shaft rope guard 7 at a predetermined position, and an excessive centrifugal force acts on the inner shaft rope guard 7 as the front propeller 6 rotates, so that the front propeller 6 is prevented. There is no fear that an unreasonable force will be applied to the mounting portion of 6 to adversely affect the strength of the mounting portion. Furthermore, the mechanical molding of the inner shaft rope guard 7 is extremely easy.

On the other hand, the concave groove on the inner peripheral surface side of the inner shaft rope guard 7 is aligned with the ridge protruding to the outer peripheral surface side of the net protector 11, and the ring of the free end edge portion of the inner shaft rope guard 7 is formed. Since the notch portion of the rear propeller 9 and the annular notch portion formed in the shoulder portion of the hub portion of the rear propeller 9 are aligned, a complicated vertical cross section is provided between the rope guard 7 for the inner shaft and the rear propeller 9. Even if a suspended matter such as a fine fishing net cut by the front propeller is formed with an annular gap having a shape, it can be prevented from invading the inside and damaging the sealing device 8 by being wound.

[Effect of device]

As described in detail above, the rope guard for a marine counter-rotating propeller according to the present invention provides the following effects and advantages.

(1) Since the rope guard is made of fiber reinforced synthetic resin, there is no concern that the rope guard will be electrochemically corroded by an electrochemical reaction with the propeller to which the rope guard is attached. Therefore, the rope guard can be securely attached to the propeller by a simple fixing means such as a fixing bolt, and the attaching / detaching work can be easily performed.

(2) The rope guard covers the sealing device between the front propeller and the rear propeller in an annular shape, and one end edge side of the rope guard is fixed to the hub portion of one propeller when viewed in the axial direction. It is possible to prevent problems such as floating nets, ropes, and other floating matter floating in the water from being wound around the sealing device, hindering smooth rotation of the sealing device, and damaging the sealing device. .

(3) Since the rope guard is made of fiber reinforced synthetic resin, it is relatively lightweight and easy to machine. And because the rope guard is lightweight,
With the rotation of the propeller to which the rope guard is attached, excessive centrifugal force does not act on the rope guard,
Therefore, there is no fear that an unreasonable force will be applied to the attachment portion of the rope guard to the propeller and the strength of the attachment portion will be adversely affected.

(4) An annular L-shaped notch formed in the inner shoulder on the tip edge side of the rope guard is formed so as to be aligned with an annular L-shaped notch formed in the shoulder of the hub portion of the rear propeller. Therefore, there is a complicated longitudinal cut between the annular L-shaped notch formed in the inner shoulder on the tip edge side of the rope guard and the annular L-shaped notch formed in the shoulder of the rear propeller hub. In addition to forming a ring-shaped clearance in the shape of a surface, an annular groove is formed on the inner peripheral surface side of the rope guard, and this groove is the hub portion of the propeller on the side where the rope guard is not attached. Since it is arranged in alignment with the annular ridge protruding to the outer peripheral surface side of the annular net protector fixed to, there is an annular gap with a complicated vertical cross-sectional shape between the rope guard and the net protector. Will be formed and fine Even a suspended matter such as a fishing net can be prevented from invading the inside and winding around the sealing device or damaging the sealing device.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a main portion of a marine counter-rotating propeller equipped with a rope guard according to an embodiment of the present invention.
1 is a partially enlarged view of FIG. 1, FIG. 3 (a) is a schematic vertical sectional view of a main portion of a conventional marine counter-rotating propeller equipped with a rope guard, and FIG. 3 (b) is FIG. Part (a) is an enlarged plan view, FIG. 3 (c) is a partly enlarged view of FIG. 3 (a), and FIG. 4 shows an example of a conventional rope guard portion different from that of FIG. FIG. 5 is a longitudinal cross-sectional view of a main part showing still another example of a conventional rope guard part. 1 ... Inner shaft, 2 ... Outer shaft, 3 ... Hull, 4 ... Outer shaft rope guard, 5 ... Outer shaft sealing device, 6 ... Front propeller, 7 ... Inner shaft rope guard, 8 …… Inner shaft sealing device, 9 …… Rear propeller, 10 …… Bolt, 11 …… Net protector.

Claims (1)

(57) [Scope of utility model registration request] 1. A base edge of the front propeller is formed so as to annularly cover a sealing device formed between a front propeller and a rear propeller which are formed of a fiber reinforced synthetic resin and rotate in opposite directions on the same axis. An annular groove is formed on the outer peripheral surface of the annular net protector that is fixed to the hub portion of the rear propeller and that is fixed to the hub portion. An inner L-shaped notch formed in the shoulder portion of the hub portion of the rear propeller is aligned with an inner L-shaped notch formed on the edge side of the rear propeller. Reverse propeller rope guard.