Structure of controllable-pitch propeller piston

Abstract

The utility model discloses a controllable-pitch propeller piston structure which comprises a propeller hub, a piston is movably arranged in the propeller hub, a left oil cavity and a right oil cavity are formed in the two ends of the piston, and the left oil cavity and the right oil cavity are isolated from each other. A plurality of rotating holes are formed in the propeller hub in the radial direction, the rotating holes penetrate through the side wall of the propeller hub to be communicated with the interior of the propeller hub, and a plurality of crank discs are movably arranged in the rotating holes; a crank disc oil cavity is formed between the crank disc and the piston and is divided into two parts; two additional holes are formed in the piston in the radial direction, and the crank disc oil cavity communicates with the left side oil cavity and the right side oil cavity through the two additional holes correspondingly. Hydraulic oil is arranged in the left side oil cavity, the right side oil cavity and the crank disc oil cavity. The two additional holes are additionally formed in the piston and communicated with the crank disc oil cavity, the rotating speed of the blades is increased, and meanwhile the sealing service life is prolonged due to the fact that friction is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ship propeller hubs, in particular to the structure of a controllable pitch propeller piston. Background Art

[0002] The ship's propeller's controllable pitch propeller is separated by a piston into left and right chambers. The piston is pushed by increasing the pressure on one side. The movement of the piston drives the blades to rotate, thereby adjusting the pitch. To ensure smooth rotation of the blades, the crank plate connected to the blades must be filled with oil. The crank plate is in an independent chamber, which is isolated from the chambers on the left and right of the piston.

[0003] The crank plate chamber is divided into two parts by the crank and the guide grooves on both sides of the crank on the piston. The oil flows between the two parts through the gap between the piston and the hub. Since the oil fills the entire space and the gap is relatively small, the piston is subjected to relatively large resistance, which reduces the speed of rotation of the blade. Due to the centrifugal force generated when the blade rotates, the oil in the crank plate chamber generates outward pressure, forming a pressure difference compared to when the blade is stationary. The pressure difference causes the blade seal to be in different positions when the blade is stationary and when it is running. Relative friction is formed between the seal and the blade, which reduces the service life of the seal. Utility Model Content

[0004] The purpose of the present utility model is to provide a structure of a controllable pitch propeller piston to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a structure of a controllable pitch propeller piston, comprising a propeller hub, a piston movably disposed inside the propeller hub, a left oil chamber and a right oil chamber disposed at both ends of the piston, the left oil chamber and the right oil chamber being connected via a guide hole;

[0006] The hub is provided with a plurality of rotating holes in the radial direction, the rotating holes penetrate the side wall of the hub and communicate with the interior of the hub, a plurality of crank disks are movably provided in the rotating holes, and the linear movement of the piston drives the crank disk to rotate through the transmission mechanism;

[0007] A crank plate oil chamber is provided between the crank plate and the piston, and a guide groove is provided on the outer diameter surface of the piston. The guide groove is located inside the crank plate oil chamber and divides the crank plate oil chamber into two parts.

[0008] The piston is provided with two additional holes in the radial direction, and the crank plate oil chamber is connected to the left oil chamber and the right oil chamber respectively through the two additional holes;

[0009] Hydraulic oil is provided in the left oil chamber, the right oil chamber and the crank plate oil chamber.

[0010] Preferably, a blade flange is fixedly mounted on the outer end surface of the crank plate, and the blade flange is used for mounting the blade.

[0011] Preferably, an outer seal is provided on the outer periphery of the rotating hole, and the outer seal is installed in a sealing groove outside the hub, and the hub and the blade flange are sealed by the outer seal.

[0012] Preferably, an inner seal is provided on the inner side surface of the hub, and the hub is sealed with the left oil chamber and the right oil chamber respectively through the inner seal.

[0013] Preferably, the rotation center of the crank disk is perpendicular to the hub.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The utility model adds additional holes on the piston, so that the left and right oil chambers are connected to the crank plate oil chamber respectively, and the pressure on both sides of the piston is introduced into the crank plate oil chamber. The pressure on the left and right sides of the crank plate oil chamber is different, the piston movement resistance is small, the crank plate rotation speed is accelerated, and the rotation speed of the blade installed on the blade flange is significantly faster than before;

[0016] As the crank plate oil chamber pressure increases, the difference between when the blade is stationary and when it is rotating is very small, which reduces the back-and-forth swing of the outer seal, reduces the friction between the outer seal and the blade flange, and increases the service life of the outer seal;

[0017] Since the additional hole is relatively small, the piston will not be unable to move due to excessive pressure loss, and the processing cost is low, which is much lower than the cost of adding oil circuits to couplings and oil seals. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model;

[0019] Figure 2 This is a schematic diagram of the external structure of the utility model.

[0020] In the figure: 1. Hub; 2. Piston; 3. Crank plate; 4. Blade flange; 5. External seal; 6. Internal seal; 7. Guide groove; 8. Left oil chamber; 9. Right oil chamber; 10. Rotary hole; 11. Crank plate oil chamber; 12. Additional hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0022] See also Figure 1-2 The utility model provides a technical solution: a structure of a controllable pitch propeller piston, comprising a propeller hub 1, a piston 2 movably provided inside the propeller hub 1, a left oil chamber 8 and a right oil chamber 9 provided at both ends of the piston 2, and the left oil chamber 8 and the right oil chamber 9 are isolated from each other;

[0023] The hub 1 is provided with a plurality of rotating holes 10 in the radial direction. The rotating holes 10 penetrate the side wall of the hub 1 and communicate with the interior of the hub 1. A plurality of crank disks 3 are movably provided in the rotating holes 10. The piston 2 linearly moves to drive the crank disk 3 to rotate through the transmission mechanism. The rotation center of the crank disk 3 is perpendicular to the hub 1.

[0024] A crank oil chamber 11 is provided between the crank plate 3 and the piston 2. A guide groove 7 is provided on the outer diameter surface of the piston 2. The guide groove 7 is located inside the crank oil chamber 11 and divides the crank oil chamber 11 into two parts.

[0025] Two additional holes 12 are provided in the radial direction of the piston 2, and the crank plate oil chamber 11 is connected to the left oil chamber 8 and the right oil chamber 9 through the two additional holes 12 respectively;

[0026] Hydraulic oil is provided in the left oil chamber 8, the right oil chamber 9 and the crank plate oil chamber 11.

[0027] Among them, in the traditional structure, the piston 2 makes a linear motion in the hub 1, and drives the crank plate 3 to rotate through the transmission mechanism. The crank plate 3 is fixedly connected to the blade flange 4. The left oil chamber 8, the right oil chamber 9 and the crank plate oil chamber 11 are isolated from each other. Due to the different oil pressures when the blade is stationary and when it is rotating, there is more friction between the outer seal 5 and the blade flange 4. At this time, the pressure on the left and right sides of the crank plate oil chamber 11 is the same. Due to the small gap between the piston 2 and the hub 1, the movement resistance of the piston 2 is large, resulting in slow rotation of the blade.

[0028] By setting two additional holes 12, the two additional holes 12 connect the crank plate oil chamber 11 with the left oil chamber 8 and the right oil chamber 9, and introduce the pressure on both sides of the piston 2 into the crank plate oil chamber 11. The pressure on the left and right sides of the crank plate oil chamber 11 is different, the movement resistance of the piston 2 is small, and the rotation speed of the crank plate 3 is accelerated, so that the rotation speed of the blade installed on the blade flange 4 is significantly faster than before. It should be noted that the additional hole 12 cannot be too large, otherwise it will affect the overall efficiency.

[0029] The outer end surface of the crank plate 3 is fixedly mounted with a blade flange 4, which is used to mount the blade;

[0030] An outer seal 5 is provided on the outer periphery of the rotating hole 10. The outer seal 5 is installed in a sealing groove outside the hub 1. The hub 1 and the blade flange 4 are sealed by the outer seal 5.

[0031] An inner seal 6 is provided on the inner side of the hub 1 , and the hub 1 is sealed with the left oil chamber 8 and the right oil chamber 9 respectively through the inner seal 6 .

[0032] The crank plate oil chamber 11 is connected to the left oil chamber 8 and the right oil chamber 9 through two additional holes 12, which increases the movement speed of the piston 2. Since the pressure in the crank plate oil chamber 11 increases, the difference between when the blade is stationary and when it is rotating is very small, which reduces the back-and-forth swing of the outer seal 5. The outer seal 5 has less friction with the blade flange 4, which increases the service life of the outer seal 5. In addition, the inner seal 6 is used for sealing between the hub 1 and the piston 2.

[0033] The working principle and use process of this utility model:

[0034] The piston 2 makes a linear motion in the hub 1, and drives the crank plate 3 to rotate through the transmission mechanism, so that the blade flange 4 fixedly mounted on the crank plate 3 rotates, and the blade fixedly mounted on the blade flange 4 rotates; by setting two additional holes 12, the two additional holes 12 connect the crank plate oil chamber 11 with the left oil chamber 8 and the right oil chamber 9, and introduce the pressure on both sides of the piston 2 into the crank plate oil chamber 11. The left and right pressures of the crank plate oil chamber 11 are different, the movement resistance of the piston 2 is small, and the rotation speed of the crank plate 3 is accelerated, so that the rotation speed of the blade mounted on the blade flange 4 is significantly faster than before; in addition, due to the increase in the pressure of the crank plate oil chamber 11, the difference is very small when the blade is stationary and rotating, which reduces the back and forth swing of the outer seal 5, and the friction between the outer seal 5 and the blade flange 4 is less, thereby improving the service life of the outer seal 5.

[0035] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A structure of a controllable pitch propeller piston, comprising a propeller hub (1), characterized in that: A piston (2) is movably provided inside the hub (1), and a left oil chamber (8) and a right oil chamber (9) are provided at both ends of the piston (2), and the left oil chamber (8) and the right oil chamber (9) are isolated from each other; The hub (1) is provided with a plurality of rotating holes (10) in the radial direction, the rotating holes (10) penetrate the side wall of the hub (1) and communicate with the interior of the hub (1), a plurality of crank disks (3) are movably provided in the rotating holes (10), and the piston (2) linearly moves to drive the crank disks (3) to rotate through a transmission mechanism; A crank plate oil chamber (11) is provided between the crank plate (3) and the piston (2), and a guide groove (7) is provided on the outer diameter surface of the piston (2). The guide groove (7) is located inside the crank plate oil chamber (11), and the guide groove (7) divides the crank plate oil chamber (11) into two parts. The piston (2) is provided with two additional holes (12) in the radial direction, and the crank plate oil chamber (11) is connected to the left oil chamber (8) and the right oil chamber (9) respectively through the two additional holes (12); Hydraulic oil is provided in the left oil chamber (8), the right oil chamber (9) and the crank plate oil chamber (11).

2. The structure of a controllable pitch propeller piston according to claim 1, characterized in that: A blade flange (4) is fixedly mounted on the outer end surface of the crank disk (3), and the blade flange (4) is used for mounting the blade.

3. The structure of a controllable pitch propeller piston according to claim 2, characterized in that: An outer seal (5) is provided on the outer periphery of the rotating hole (10), and the outer seal (5) is installed in a sealing groove outside the hub (1). The hub (1) and the blade flange (4) are sealed by the outer seal (5).

4. The structure of a controllable pitch propeller piston according to claim 1, characterized in that: An inner seal (6) is provided on the inner side of the propeller hub (1), and the propeller hub (1) is sealed with the left oil chamber (8) and the right oil chamber (9) respectively through the inner seal (6).

5. The structure of a controllable pitch propeller piston according to claim 1, characterized in that: The rotation center of the crank disk (3) is perpendicular to the propeller hub (1).

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