CN217456310U - Coaxial differential rotary crank-slider type marine variable pitch propeller - Google Patents
Coaxial differential rotary crank-slider type marine variable pitch propeller Download PDFInfo
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- CN217456310U CN217456310U CN202220379986.8U CN202220379986U CN217456310U CN 217456310 U CN217456310 U CN 217456310U CN 202220379986 U CN202220379986 U CN 202220379986U CN 217456310 U CN217456310 U CN 217456310U
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- outer shaft
- crank
- paddle
- driving gear
- pitch
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- 238000009434 installation Methods 0.000 abstract description 2
- 239000011295 pitch Substances 0.000 description 28
- 230000006378 damage Effects 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001141 propulsive effect Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
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Abstract
The utility model discloses a coaxial differential rotary crank-slider type marine pitch-variable propeller, which comprises a paddle bracket outer shaft, a paddle, a driving gear, a driven gear and a crank-slider mechanism, wherein the paddle bracket outer shaft is connected with the output end of a first speed change device; the blade support outer shaft is provided with a plurality of blades, the plurality of blades are distributed at equal intervals in the circumferential direction of the blade support outer shaft, and the root parts of the blades are rotatably installed on the blade support outer shaft through installation holes formed in the blade support outer shaft; the central shaft of the driving gear is connected with the output end of the second speed changing device; the number of the driven gears and the crank slide block mechanisms is consistent with that of the blades; a plurality of driven gears evenly distributed are in the periphery of driving gear and mesh with the driving gear, and the root of paddle passes through slider-crank mechanism and driven gear rotation is connected. When the device works, the relative rotation of the outer shaft of the blade bracket and the driving gear is used for adjusting the pitch to realize the hovering and reverse thrust of the navigation ship, and the danger avoiding braking time can be effectively shortened when an emergency situation occurs.
Description
Technical Field
The utility model relates to a screw, more specifically say, relate to a marine variable pitch oar of crank block formula of coaxial differential gyration.
Background
At present, the existing propellers are various in types, and the propellers refer to devices which rotate in air or water by means of blades and convert the rotating power of an engine into propulsive force. Pitch refers to the face pitch of the propeller: the blade surface of the propeller is a rotating surface. The intersection line of any cylindrical surface coaxial with the propeller and the blade surface is a section of a spiral line, the cylindrical surface and the blade are cut to obtain the tangent plane of the blade, namely, the tangent plane of the blade is positioned on the spiral line of the intersection of the cylindrical surface and the blade surface, and the axial distance between the two ends of the blade is equal to the pitch of the spiral line. It is customary to name the geometric pitch at 70% diameter, also denoted as blade angle.
When a sailing ship is in danger at sea, the sailing ship needs to avoid danger by steering, decelerating and adopting the modes of anchor sinking and the like if necessary, and the method needs long braking time and can cause irreversible damage to a power mechanism and a ship anchor. The anchoring method requires that the seabed cannot be too deep, and permanent injury of the anchor machine can be caused after anchoring, when the common pitch propeller is braked in an emergency, the common pitch propeller only stops rotating first and then rotates reversely, and the power device is damaged in the stopping process. The pitch-variable propeller reversely obtains the reverse thrust by the pitch, so that on one hand, the braking process of the driving part is omitted, the driving part is protected, on the other hand, the reverse thrust can be quickly obtained, and the braking time in danger avoidance is shortened.
The existing variable pitch propeller comprises a hydraulic variable pitch propeller and an elastic element self-adaptive variable pitch propeller, wherein the hydraulic variable pitch propeller needs to be separately provided with a hydraulic system and a push-pull rod, and is expensive, and although the cost of the elastic element self-adaptive variable pitch propeller is low, the pitch of the propeller cannot be reversed to rapidly provide reverse thrust in emergency danger avoidance.
SUMMERY OF THE UTILITY MODEL
Can not be when promptly keeping away the danger with the pitch reverse with the problem that provides thrust or cost are expensive fast to current pitch-changing oar, the utility model provides a marine pitch-changing oar of slider-crank formula of coaxial differential gyration is equipped with slider-crank mechanism at the paddle root, can be under the circumstances of turning to and the rotational speed that does not change pitch-changing oar normal work, through the outer axle production differential of gearbox control driving gear for the pitch-changing of symmetrical arrangement and paddle support, and then change the pitch to reach the quick braking effect.
In order to solve the problem, the utility model adopts the following technical proposal.
A coaxial differential rotation crank slider type marine variable pitch propeller comprises a paddle bracket outer shaft and a paddle, wherein the paddle bracket outer shaft is connected with the output end of a first speed change device; the blade support outer shaft is provided with a plurality of blades, the plurality of blades are distributed at equal intervals in the circumferential direction of the blade support outer shaft, and the root parts of the blades are rotatably installed on the blade support outer shaft through installation holes formed in the blade support outer shaft; the central shaft of the driving gear is connected with the output end of the second speed changing device; the number of the driven gears and the crank slide block mechanisms is consistent with that of the blades; a plurality of driven gears evenly distributed are in the periphery of driving gear and mesh with the driving gear, and the root of paddle passes through slider-crank mechanism and driven gear rotation is connected.
According to a further technical scheme, the crank block mechanism comprises a connecting rod, a cam block and a crank shaft; the number of the crankshafts is consistent with that of the driven gears, and the crankshafts are fixed on central shafts of the driven gears; one end of the connecting rod is hinged with the crank shaft, and the other end of the connecting rod is fixedly connected with the cam sliding block; the paddle and the cam slider form a sliding pair.
According to the further technical scheme, a groove is formed in the cam sliding block, a roller is arranged at the root of the paddle, and the roller is located in the groove.
According to a further technical scheme, the groove is spiral in shape.
Further technical scheme, the paddle is equipped with threely, along the equidistant distribution of the circumference of paddle support outer axle.
According to the further technical scheme, the central shaft of the driving gear and the central shaft of the outer shaft of the paddle support are located on the same straight line.
According to the further technical scheme, the input ends of the first speed changing device and the second speed changing device are connected with a ship power system.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a marine pitch changing oar of crank block formula of coaxial differential gyration, when the ship distress needs the quick braking of thrust reaction, the driving gear realizes the differential with the outer axle of paddle support, just can realize the change of paddle angle to the rotation angle of each thick liquid is the same, thereby obtains thrust reaction with the pitch is reverse fast. For the traditional fixed propeller, the time of stopping and reversing is saved, and the braking effect can be achieved more quickly.
(2) The utility model discloses a marine pitch-changing oar of crank block formula of coaxial differential gyration, compare in ordinary pitch-changing formula screw, do not need extra hydraulic power system, the transmission of coaxial differential effectively reduces the volume of displacement structure when the during operation because of the relative motion error that two sets of driving system brought, cavitation harm in the pitch-changing oar has been reduced, and the dead point position of operating point at the slider-crank, the resistance that the paddle receives can not let the cam slider move, make the mechanism obtain better mechanical properties, be more applicable to large-scale boats and ships.
Drawings
Fig. 1 is a front view of the present invention;
fig. 2 is a top view of the present invention;
FIG. 3 is a structural exploded view of the present invention;
fig. 4 is a schematic structural view of the slider-crank mechanism of the present invention;
fig. 5 is a schematic structural view of the cam slider of the present invention;
fig. 6 is a schematic structural view of an outer shaft of the blade support of the present invention;
fig. 7 is an axial cross-sectional view of a blade of the present invention;
fig. 8 is a schematic structural view of the blade of the present invention;
fig. 9 is a schematic diagram of the transmission of the present invention.
In the figure: 1. a paddle mount outer shaft; 2. a paddle; 3. a driving gear; 4. a driven gear; 5. a connecting rod; 6. a cam slider; 7. a roller; 8. a crank shaft; 9. and (4) a groove.
Detailed Description
The invention will be further described with reference to specific embodiments and drawings.
Example 1
The embodiment provides a coaxial differential rotation crank-slider type marine pitch-variable propeller, as shown in fig. 1, 2 and 3, comprising a blade bracket outer shaft 1, a blade 2, a driving gear 3, a driven gear 4 and a crank-slider mechanism. The outer shaft 1 of the paddle support is connected with the output end of the first speed changing device, the central shaft of the driving gear 3 is connected with the output end of the second speed changing device, and the central shaft of the driving gear 3 and the central shaft of the outer shaft 1 of the paddle support are located on the same straight line. The input ends of the first speed changing device and the second speed changing device are both connected with a power system of the ship, and the input ends of the first speed changing device and the second speed changing device are connected with the same power source, so that energy is saved.
In this embodiment, there are 3 blades 2, where the structure of the blade 2 is as shown in fig. 7 and 8, the 3 blades 2 are distributed at equal intervals in the circumferential direction of the blade mount outer shaft 1, and the structure diagram of the blade mount outer shaft 1 is as shown in fig. 6. The root of the blade 2 passes through a mounting hole formed in the outer shaft 1 of the blade bracket and is rotationally connected with the driven gear 4 through a slider-crank mechanism. The number of the driven gears 4 and the crank slide block mechanisms is consistent with that of the blades 2; the plurality of driven gears 4 are uniformly distributed on the periphery of the driving gear 3 and are meshed with the driving gear 3.
Specifically, as shown in fig. 4, the crank block mechanism includes a connecting rod 5, a cam block 6, and a crank shaft 8; the number of the crank shafts 8 is consistent with that of the driven gears 4, and the crank shafts 8 are fixed on the central shaft of the driven gears 4; one end of the connecting rod 5 is hinged with the crank shaft 8, and the other end is fixedly connected with the cam slider 6; the paddle 2 and the cam slider 6 form a sliding pair. As shown in fig. 5, a groove 9 is formed in the cam slider 6, a roller 7 is arranged at the root of the blade 2, the roller 7 is located in the groove 9, and the roller 7 can slide in the groove 9. The shape of the groove 9 is spiral.
Under the drive of a power source, power is input into the first speed changing device and the second speed changing device which are symmetrically arranged in a one-way mode through the front end transmission device and then is output to the outer shaft 1 of the blade bracket and the driving gear 3 respectively, so that the outer shaft 1 of the blade bracket and the driving gear 3 rotate at the same speed or at different speeds, and the relative motion between the outer shaft 1 of the blade bracket and the driving gear 3 is achieved to change the thread pitch. The coaxial input and bidirectional output transmission structure effectively avoids the difficulty in controlling the same speed or differential speed of the inner shaft and the outer shaft caused by the difference of the transmission parts, and reduces the relative motion error caused by two sets of power systems during working. The first speed changing device and the second speed changing device are two identical speed changers and are used for respectively adjusting the rotating speeds of the outer shaft 1 of the blade support and the driving gear 3. The input ends of the two speed changers are input by the same power source through the transmission device, the output ends of the two speed changers are respectively connected into the outer shaft 1 and the driving gear 3 of the paddle support, the structure is more favorable for controlling the same speed and differential speed between the outer shaft 1 and the driving gear 3 of the paddle support, and the influence of the difference of the transmission device on the rotating speed of the outer shaft 1 and the driving gear 3 of the paddle support is reduced.
During normal driving: the steamship power system drives the first speed change device and the second speed change device to output the same rotating speed, the outer shaft 1 of the blade bracket and the driving gear 3 rotate at the same speed, the two keep relatively static, the crank slide block mechanism does not act, the blade angle is fixed, and the propulsive force or the reverse thrust is generated.
When the blade angle needs to be changed: under the drive of a ship power system, the first speed changing device and the second speed changing device respectively output different rotating speeds to the blade bracket outer shaft 1 (outer shaft) and the driving gear 3 (inner shaft) to rotate to generate speed difference, the inner shaft and the outer shaft move relatively, a crank shaft 8 of the crank slider mechanism drives the cam slider 6 to move through a connecting rod 5, and a roller 7 on the blade 2 moves along a track curve of a groove 9 on the cam slider 6, so that the blade 2 rotates, the blade angle is changed, the rotating angles of the blades 2 are the same, the reverse thrust is realized, the risk avoidance braking time is shortened, and the rapid braking is realized.
The working principle is as follows: the variable pitch structure is a crank slide block mechanism, the rated working positions of positive and negative pitches are all at dead points, and pi rad relative motion half-circle needs to be generated between the outer shaft 1 of the blade bracket and the driving gear 3, so that the required variable pitch time t can be calculated according to different rotation speeds output by different calculation of two gear transmission ratios of the transmission:
N inner part ＝n Input device ·i Inner part
N Outer cover ＝n Input device ·i Outer cover
t＝|N Inner part -N Outer cover |×2
In the formula n Input device Speed at which both transmissions receive a common power input, N Outer cover For the real-time speed, N, of the outer shaft after transmission Inner part Is the real-time rotating speed i obtained after the inner shaft is driven Inner part Real-time transmission ratio for the inner shaft through the variator i Outer cover The real-time transmission ratio of the outer shaft passing through the transmission.
The power control unit controls the working time of different transmission ratios of the two transmissions by receiving the variable pitch time t so that the inner shaft and the outer shaft move for half cycle relatively to reach another dead point and lead the thread pitches to be opposite. Therefore, when the time t of the variable pitch is reached and the pitch has changed to reach the target value, namely the reverse dead point position, at the moment, the power control unit controls the two speed changers to output the same transmission ratio, so that the inner shaft and the outer shaft are relatively static again, the propeller continues to normally work, and the propelling force or the reverse thrust is generated.
The examples of the utility model are only right the utility model discloses a preferred embodiment describes, and not right the utility model discloses design and scope are injectd, do not deviate from the utility model discloses under the prerequisite of design idea, the field engineering technical personnel are right the utility model discloses a various deformation and improvement that technical scheme made all should fall into the protection scope of the utility model.
Claims (7)
1. A coaxial differential rotation crank slider type marine variable pitch propeller comprises a blade bracket outer shaft (1) and blades (2), wherein the blade bracket outer shaft (1) is connected with the output end of a first speed change device; the plurality of paddles (2) are arranged, the plurality of paddles (2) are distributed on the outer shaft (1) of the paddle bracket at equal intervals in the circumferential direction, and the roots of the paddles (2) are rotatably arranged on the outer shaft (1) of the paddle bracket through mounting holes formed in the outer shaft (1) of the paddle bracket; the method is characterized in that: the transmission mechanism further comprises a driving gear (3), a driven gear (4) and a slider-crank mechanism, wherein the central shaft of the driving gear (3) is connected with the output end of the second speed changing device; the number of the driven gears (4) and the crank slide block mechanisms is consistent with that of the blades (2); a plurality of driven gears (4) are uniformly distributed on the periphery of the driving gear (3) and meshed with the driving gear (3), and the root of the paddle (2) is rotationally connected with the driven gears (4) through a slider-crank mechanism.
2. The pitch propeller of claim 1, wherein the pitch propeller comprises: the crank sliding block mechanism comprises a connecting rod (5), a cam sliding block (6) and a crank shaft (8); the number of the crankshafts (8) is consistent with that of the driven gears (4), and the crankshafts (8) are fixed on the central shaft of the driven gears (4); one end of the connecting rod (5) is hinged with the crank shaft (8), and the other end of the connecting rod is hinged with the cam sliding block (6); the paddle (2) and the cam slider (6) form a sliding pair.
3. The pitch propeller of claim 2, wherein the pitch propeller comprises: a groove (9) is formed in the cam sliding block (6), a roller (7) is arranged at the root of the paddle (2), and the roller (7) is located in the groove (9).
4. A coaxial differentially rotating pitch propeller for a ship of the slider-crank type according to claim 3, wherein: the shape of the groove (9) is spiral.
5. The pitch propeller of claim 4, wherein the propeller comprises: the paddle (2) is three and is distributed along the circumferential direction of the paddle bracket outer shaft (1) at equal intervals.
6. The pitch-variable propeller of claim 5, wherein the pitch-variable propeller comprises: the central shaft of the driving gear (3) and the central shaft of the outer shaft (1) of the blade bracket are positioned on the same straight line.
7. The pitch propeller of claim 6, wherein the propeller comprises: the input ends of the first speed changing device and the second speed changing device are connected with a ship power system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220379986.8U CN217456310U (en) | 2022-02-24 | 2022-02-24 | Coaxial differential rotary crank-slider type marine variable pitch propeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220379986.8U CN217456310U (en) | 2022-02-24 | 2022-02-24 | Coaxial differential rotary crank-slider type marine variable pitch propeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217456310U true CN217456310U (en) | 2022-09-20 |
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ID=83262749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220379986.8U Expired - Fee Related CN217456310U (en) | 2022-02-24 | 2022-02-24 | Coaxial differential rotary crank-slider type marine variable pitch propeller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217456310U (en) |
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2022
- 2022-02-24 CN CN202220379986.8U patent/CN217456310U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220920 |