CN213579876U - Friction-free power meter for directly measuring thrust and torque of propeller - Google Patents

Abstract

The utility model belongs to the field of ship hydrodynamic force performance tests, and particularly discloses a frictionless dynamometer for directly measuring propeller thrust and torque, which comprises a horizontal diversion shell, a vertical connecting piece, a horizontal gear shaft, a horizontal spline shaft, a horizontal connecting shaft, a measuring end shaft and a signal receiver, wherein the vertical connecting piece is arranged on the horizontal diversion shell, a vertical gear shaft is arranged in the vertical connecting piece, and the lower end of the vertical gear shaft is meshed with the horizontal gear shaft; the horizontal gear shaft, the horizontal spline shaft, the horizontal connecting shaft and the measuring end shaft are sequentially connected and are all arranged in the horizontal flow guide shell; the axial direction and the circumferential direction strain gauges are adhered to the measuring end shaft, the horizontal spline shaft is provided with a wireless node, and the wireless node is used for wirelessly transmitting a measuring signal measured by the axial direction and the circumferential direction strain gauges to a signal receiver. The utility model discloses the sensor is located outermost transmission shaft, can directly measure thrust and moment of torsion at the screw near-end, need not to measure frictional force and deduct work, can realize higher measurement accuracy.

Description

Friction-free power meter for directly measuring thrust and torque of propeller

Technical Field

The utility model belongs to boats and ships hydrodynamic force performance test field, more specifically relates to a no friction power appearance that is used for screw thrust and moment of torsion direct measurement.

Background

The ship model self-propulsion appearance is the device of measuring screw propulsion performance, its measure the thinking for the thrust and the moment of torsion that send the screw pass through the oar axle and transmit to uncovered water tank in, equip at uncovered water tank internally mounted self-propulsion appearance and motor etc. the benefit of this kind of measure the thinking is that can transmit the atress of the screw in waters inside the uncovered water tank well, avoided the instrument to intake and received the harm, and the installation is simple in the in-service use process, can satisfy the engineering requirement moreover.

But the defect is obvious, the part of the paddle shaft entering the open water tank can generate a friction torque during rotation due to the use of butter or other watertight devices, the general processing method is that the propellers are not respectively installed before and after the experiment, the friction torque at different rotating speeds in the no-paddle state is measured, and the torque is deducted when the paddles exist, so that the actual torque of the propellers is obtained. The processing method has very high installation requirements on the propeller shaft system, can not cause serious water leakage, and can not cause overlarge zero torque to cause overlarge measurement data error.

SUMMERY OF THE UTILITY MODEL

To the above defect or the improvement demand of prior art, the utility model provides a no friction power appearance for screw thrust and moment of torsion direct measurement, its aim at directly arranges the sensor in on the transmission shaft, need not to consider friction torque's influence during the measurement, can directly acquire screw thrust and moment of torsion, improves screw capability test precision.

In order to achieve the above object, the utility model provides a no friction dynamometer for screw thrust and moment of torsion direct measurement, including horizontal water conservancy diversion casing, vertical connecting piece, horizontal gear axle, horizontal spline shaft, horizontal connection axle, measurement end shaft and signal receiver, wherein:

the vertical connecting piece is arranged on the horizontal diversion shell, a vertical gear shaft is arranged in the vertical connecting piece, and the lower end of the vertical gear shaft is meshed with the horizontal gear shaft; the horizontal gear shaft, the horizontal spline shaft, the horizontal connecting shaft and the measuring end shaft are sequentially connected and are all arranged in the horizontal flow guide shell;

the measuring end shaft is adhered with axial and circumferential strain gauges, a wireless node is arranged at the position of the horizontal spline shaft and used for wirelessly transmitting a measuring signal measured by the axial and circumferential strain gauges to the signal receiver.

Preferably, the horizontal connecting shaft and the measuring end shaft are hollow shafts, and power supply and measuring lines are arranged in the hollow shafts and connected with the axial strain gauge and the circumferential strain gauge.

Preferably, the horizontal spline shaft is a hollow shaft, the end of the horizontal spline shaft is provided with a butt spline, and the power supply and measurement line is communicated with the wireless node through the butt spline.

Preferably, a rubber body is fixed on the horizontal spline shaft, a wireless node and a special battery are fixed in the rubber body, and the special battery is used for supplying power to the wireless node and the signal receiver.

As further preferred, the vertical connecting piece lower extreme is equipped with vertical base, its with the laminating of horizontal water conservancy diversion casing, and the laminating department has arranged vertical shaft bearing base, and this vertical shaft bearing base is used for supporting angular contact ball bearing, and angular contact ball bearing top has arranged the gland.

Preferably, the vertical member base is provided with a hole for arranging the signal receiver.

Preferably, a bottom perforated cover plate is arranged below the horizontal diversion shell at the horizontal gear shaft, the bottom perforated cover plate is tightly attached to the horizontal diversion shell, and an O-shaped sealing ring is sleeved at the attachment position.

Preferably, the end part of the horizontal diversion shell, which is close to one side of the horizontal gear shaft, is a diversion cone, and the vertical connecting piece is streamline.

Generally, through the utility model above technical scheme who thinks compares with prior art, mainly possesses following technical advantage:

1. the utility model designs the thrust torque measuring device as a part of the propeller thrust shaft, the position is arranged behind the propeller mould, and no bearing or waterproof sealing ring is arranged between the propeller mould and the sensor, so that the thrust and the torque sent by the propeller mould can be directly measured from the force measuring sensor without being influenced by the friction of the bearing and the waterproof sealing ring on the sensor; compare with transmission screw power appearance, the utility model discloses oar mould thrust and moment of torsion are directly measured from the sensor, need not to measure frictional force and deduct work, consequently can simplify test procedure, improve efficiency of software testing, improve the measuring accuracy simultaneously.

2. The structural arrangement of the utility model greatly reduces the installation requirement of the propulsion shafting in the test process, and the measurement of the thrust and the torque is not influenced by the vibration of the shafting, so the device is particularly suitable for the test of the high-speed warship model with a slender shaft and multiple fulcrums; meanwhile, the paddle shaft can enter the open water tank part more tightly without being influenced by friction force, so that water is strictly prevented from entering the open water tank from the paddle shaft, and the dry working environment of the whole measuring device is ensured.

3. The utility model can avoid the external influence by arranging the measuring circuit in the hollow shaft; meanwhile, the measurement signal is transmitted in a wireless transmission mode through the wireless node and the signal receiver, the measurement of the thrust and the torque is completed through the wireless transmission, the error caused by the slip ring in the high-speed rotation process is avoided, and the test environment is more complex to adapt.

Drawings

Fig. 1 is a schematic view of the overall structure of a frictionless dynamometer for directly measuring the thrust and torque of a propeller according to an embodiment of the present invention;

FIG. 2 is a schematic view of a tail structure of a frictionless dynamometer according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2;

fig. 4 is a schematic structural diagram of a header of a frictionless dynamometer according to an embodiment of the present invention;

fig. 5 is a schematic view of the frictionless dynamometer according to the embodiment of the present invention.

The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein: 1-first shell, 2, 7, 34, 39, 47-O-shaped sealing rings, 3-second shell, 4-hexagonal socket head screw, 5-bearing positioning plate, 6-bottom perforated cover plate, 8, 14, 22, 25, 38-angular contact ball bearing, 9-horizontal gear shaft, 10-vertical part base, 11-vertical connecting piece, 12-vertical shaft bearing base, 13-hexagonal socket head screw, 15-vertical gear shaft, 16-positioning nut, 17-vertical transmission shaft, 18-key groove, 19-gland, 20-horizontal gear shaft, 21-bolt, 23-bearing seat, 24, 40-lip-shaped sealing rings, 26-collar, 27-signal receiver, 28-third shell, 29-wireless node, 30-rubber body, 31-special battery, 32-connecting flange, 33-spline housing, 35, 42-deep groove ball bearing, 36-fourth shell, 37-horizontal spline shaft, 41-spacer sleeve, 43-spare shell, 44-fifth shell, 45-horizontal connecting shaft, 46-measuring end shaft, 48-sliding bearing, 49-seventh shell, 50-sixth shell, 51-pool trailer, 52-servo motor and 53-propeller.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

The embodiment of the utility model provides a no friction dynamometer for screw thrust and moment of torsion direct measurement, as shown in fig. 1, including horizontal water conservancy diversion casing, vertical connecting piece 11, horizontal gear axle 9, horizontal spline shaft 37, horizontal connecting axle 45, measurement end shaft 46 and signal receiver 27, wherein:

the horizontal diversion shell comprises a first shell 1, a second shell 3, a third shell 28, a fourth shell 36, a fifth shell 44, a sixth shell 50 and a seventh shell 49 which are connected in sequence; the vertical connecting piece 11 is streamline, the upper end of the vertical connecting piece is fixed with the trailer, and the lower end of the vertical connecting piece is arranged on the second shell 3; a vertical gear shaft 15 is arranged in the vertical connecting piece 11, one end of the vertical gear shaft 15 is connected with a servo motor, and the other end is meshed with the horizontal gear shaft 9 through a gear; the horizontal gear shaft 9, the horizontal spline shaft 37, the horizontal connecting shaft 45 and the measuring end shaft 46 are connected in sequence and are all arranged in the horizontal flow guide shell; the horizontal gear shaft 9 is connected with a horizontal spline shaft 37 through a spline groove, and the horizontal spline shaft 37 is connected with a horizontal connecting shaft 45 through a bolt;

axial and circumferential strain gauges are adhered to the measuring end shaft 46, the horizontal connecting shaft 45 and the measuring end shaft 46 are hollow shafts, and power supply and measuring circuits are arranged in the hollow shafts, wherein one end of each power supply and measuring circuit is connected with the horizontal spline shaft 37 through a butt spline, and the other end of each power supply and measuring circuit is connected with the axial and circumferential strain gauges; the horizontal spline shaft 37 is a hollow shaft, the tail end of the horizontal spline shaft is provided with a butt spline, a rubber body 30 is fixed on the horizontal spline shaft 37, a wireless node 29 and a special battery 31 are fixed in the rubber body 30, the special battery 31 is used for supplying power for the wireless node 29 and the signal receiver 27, and a signal and a power supply line in the horizontal spline shaft 37 penetrate through a small hole in the shaft and are respectively connected with the wireless node 29 and the special battery 31; the wireless node 29 is used for wirelessly transmitting the measurement signals measured by the axial and circumferential strain gauges to the signal receiver 27, and the signal receiver 27 is connected with an external computer to finish thrust and torque acquisition and processing.

Particularly, the utility model discloses a no friction dynamometer can divide into afterbody structure and prelude structure, wherein:

the tail structure is shown in fig. 2 and fig. 3, and includes a first shell 1, a second shell 3, and a third shell 28, wherein:

the first shell 1 is a diversion cone, and is tightly and fixedly connected with the second shell 3 through a threaded opening, and an O-shaped sealing ring 2 is sleeved at the joint. The second shell 3 is a revolving body, a bottom perforated cover plate 6 is arranged below the second shell and used for installation, debugging or maintenance, the bottom perforated cover plate 6 is tightly attached to the second shell 3 through an inner hexagonal socket head cap screw 4, and an O-shaped sealing ring 7 is sleeved at the attachment position; and a bearing positioning plate 5 is arranged in the second shell 3, an angular contact ball bearing 8 is arranged on the bearing positioning plate 5, and a horizontal gear shaft 9 is arranged on the angular contact ball bearing 8. A vertical base 10 is arranged above the second shell 3, a vertical sword-shaped plate 11 is arranged on the vertical base 10, the vertical base 10 and the second shell 3 are attached through an inner hexagonal socket head cap screw 13, a vertical shaft bearing base 12 is arranged at the attaching position, the vertical shaft bearing base 12 supports an angular contact ball bearing 14, a vertical gear shaft 15 is arranged on the angular contact ball bearing 14, a positioning nut 16 is arranged on the vertical gear shaft 15, a key groove 18 is arranged on a vertical transmission shaft 17 and can be matched with the positioning nut 16, and the positioning and the assembling of the vertical gear shaft 15 and the vertical transmission shaft 17 are completed; a gland 19 is arranged above the angular contact ball bearing 14 and mainly used for ensuring the watertight state of the second shell 3; the bolt 21 penetrates through the vertical piece base 10 and the second shell 3, and is convenient to position during assembly. The horizontal gear shaft 20 is engaged with the vertical gear shaft 15, and the rotation of the vertical gear shaft is transmitted to the horizontal gear shaft 20. The bearing seat 23 is arranged inside the second shell 3 and used for supporting the angular contact ball bearing 22 and the angular contact ball bearing 25, the angular contact ball bearing 22 and the angular contact ball bearing 25 are used for supporting the horizontal gear shaft 9, and a lip-shaped sealing ring 24 is arranged between the angular contact ball bearing 22 and the angular contact ball bearing 25; a collar 26 is provided on the right side of the angular ball bearing 25 for positioning. The joint of the vertical piece base 10 and the second shell 3 is provided with a small hole for arranging a signal receiver 27 for receiving wireless signals and transmitting the wireless signals to a computer for subsequent processing. The third shell 28 and the second shell 3 are tightly and fixedly connected through a threaded opening, a cylindrical rubber body 30 is fixed on the section of the horizontal gear shaft 9 of the third shell 28, and the rubber body 30 is used for fixing a wireless node 29 and a special battery 31.

The header structure is shown in fig. 4, and includes a No. four shell 36, a No. five shell (44), a No. six shell 50, and a No. seven shell 49, wherein:

the fourth shell 36 and the third shell 28 are tightly and fixedly connected through threaded openings, an O-shaped sealing ring 34 is arranged at the connection position, a deep groove ball bearing 35 is arranged inside the fourth shell 36 and provides circumferential support for the spline sleeve 33, meanwhile, a connecting flange 32 is fixed on the horizontal gear shaft 9, and the connecting flange 32 provides axial support and positioning for the spline sleeve 33; the horizontal spline shaft 37 is clipped into the spline housing 33 and connected with the horizontal gear shaft 9, and the angular contact ball bearing 38 is arranged inside the four-size housing 36 to support the spline shaft 37. A standby shell 43 is arranged between the fourth shell 36 and the fifth shell 44 for fixing, the standby shell 43 and the fifth shell 44 are fixedly connected with the fourth shell 36 through threaded openings, and an O-shaped sealing ring 39 is arranged at the joint. A spacer 41 is arranged in the fifth shell 44, lip-shaped sealing rings 40 are arranged on two sides of the spacer 41, and a deep groove ball bearing 42 is arranged on one side, close to the head, of each lip-shaped sealing ring 40 and used for supporting a horizontal connecting shaft 45. The horizontal connecting shaft 45 is a hollow shaft, the first section of the horizontal connecting shaft is a measuring end shaft 46, axial and circumferential strain gauges are attached to the measuring end shaft 46, a small hole is formed in the measuring end shaft 46, and a connecting line of the axial and circumferential strain gauges penetrates into the horizontal connecting shaft 45 through the small hole. The sixth housing 50 and the seventh housing 49 are connected in turn by screwing, and an O-ring 47 and a sliding bearing 48 are provided inside them.

During measurement, as shown in fig. 5, the frictionless dynamometer needs to be used in cooperation with the pool trailer 51, the trailer 51 is provided with the servo motor 52, the frictionless dynamometer is fixedly connected with the pool trailer through the vertical connecting piece 11, the rotating shaft of the servo motor 52 is ensured to be connected with the vertical transmission shaft 17, the lower part of the frictionless dynamometer is immersed in water to a certain depth, and the measuring propeller 53 is arranged at the head of the frictionless dynamometer. After the installation is finished, the servo motor 52 rotates to drive the propeller 53 to rotate sequentially through the vertical gear shaft 15, the horizontal gear shaft 9, the horizontal spline shaft 37, the horizontal connecting shaft 45 and the measuring end shaft 46, and meanwhile, the trailer 51 moves forwards at a certain navigational speed; at the moment, the axial strain gauge and the circumferential strain gauge directly acquire axial deformation and circumferential deformation conditions, namely measurement signals, the measurement signals are transmitted to the wireless node 29 through a power supply and measurement line, the wireless node 29 wirelessly transmits the measurement signals to the signal receiver 27, the signal receiver 27 transmits the measurement signals to an external computer for subsequent processing, and thrust and torque during rotation of the propeller can be analyzed through analysis of axial deformation and circumferential deformation.

It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

Claims (8)

1. A frictionless dynamometer for direct measurement of propeller thrust and torque, comprising a horizontal flow guiding housing, a vertical connector (11), a horizontal gear shaft (9), a horizontal spline shaft (37), a horizontal connecting shaft (45), a measuring end shaft (46) and a signal receiver (27), wherein:

the vertical connecting piece (11) is arranged on the horizontal diversion shell, a vertical gear shaft (15) is arranged in the vertical connecting piece, and the lower end of the vertical gear shaft (15) is meshed with the horizontal gear shaft (9); the horizontal gear shaft (9), the horizontal spline shaft (37), the horizontal connecting shaft (45) and the measuring end shaft (46) are sequentially connected and are all arranged in the horizontal flow guide shell;

the measuring end shaft (46) is adhered with axial and circumferential strain gauges, a wireless node (29) is arranged at the position of the horizontal spline shaft (37), and the wireless node (29) is used for wirelessly transmitting measuring signals measured by the axial and circumferential strain gauges to the signal receiver (27).

2. The frictionless dynamometer for the direct measurement of propeller thrust and torque according to claim 1, characterized by the fact that the horizontal connection shaft (45) and the measurement end shaft (46) are hollow shafts inside which are arranged the power and measurement lines connected to the axial and circumferential strain gauges.

3. The frictionless dynamometer for direct measurement of propeller thrust and torque according to claim 2, characterized by the fact that said horizontal splined shaft (37) is a hollow shaft with a butt spline at its end, through which said powering and measuring lines communicate with said wireless node (29).

4. The frictionless dynamometer for direct measurement of propeller thrust and torque according to claim 1, wherein a rubber body (30) is fixed on the horizontal spline shaft (37), a wireless node (29) and a dedicated battery (31) are fixed in the rubber body (30), and the dedicated battery (31) is used for supplying power to the wireless node (29) and the signal receiver (27).

5. The frictionless dynamometer for propeller thrust and torque direct measurement according to claim 1, characterized by that, the lower end of the vertical connecting piece (11) is a vertical piece base (10) which is attached to the horizontal flow guiding housing, and a vertical shaft bearing base (12) is arranged at the attachment, the vertical shaft bearing base (12) supports an angular contact ball bearing (14), and a gland (19) is arranged above the angular contact ball bearing (14).

6. The frictionless dynamometer for direct measurement of propeller thrust and torque according to claim 5, characterized by the fact that said vertical member base (10) is perforated for the arrangement of said signal receiver (27).

7. The frictionless dynamometer for directly measuring propeller thrust and torque according to claim 1, wherein a bottom open pore cover plate (6) is arranged below the horizontal flow guide shell at the horizontal gear shaft (9), the bottom open pore cover plate (6) is tightly attached to the horizontal flow guide shell, and an O-shaped sealing ring is sleeved at the attachment.

8. The frictionless dynamometer for direct measurement of propeller thrust and torque according to any of claims 1-7, wherein the horizontal deflector shell is tapered at the end near the horizontal gear shaft (9) and the vertical connector (11) is streamlined.

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