A propeller powered instrument for a cavitating water tank

Abstract

The application discloses a propeller power instrument for a cavitation water tank, which comprises a base, a lifting and angle changing mechanism, a connecting assembly and a detecting piece; the base is fixed above the cavitation water tank and connected with a working window of the cavitation water tank, and is used for supporting the lifting and angle changing mechanism and the connecting assembly; the bottom of the lifting and angle changing mechanism is connected with the base in a cylindrical sleeve pair mode, the left and right symmetrical parts of the lifting and angle changing mechanism are fixedly connected with one end of the connecting assembly, the other end of the connecting assembly penetrates through the base and enters the cavitation water tank, and is fixedly connected with the detecting piece; the lifting and angle changing mechanism is used for driving the connecting assembly, and changes the posture of the detecting piece through the connecting assembly; and the detecting piece is used for installing a propeller to implement water power test. The lifting and angle changing mechanism is symmetrically arranged and independently controlled, the power instrument body can be simply and conveniently lifted and lowered, and the pitch angle and the roll angle of the power instrument body are simulated.

Description

Technical Field

[0001] This invention belongs to the field of hydrodynamic performance testing of ship propeller models, and particularly relates to a propeller power instrument for cavitation water cylinders. Background Technology

[0002] To study the propulsion performance of ships and objects in water, model tests are often used. Among them, the instrument used to test the thrust and torque of various propeller propeller models and their matching duct models is called a propeller power instrument. The propeller power instrument is a key piece of equipment for the model test of a uniform flow propeller in a cavitation water cylinder.

[0003] The propeller power instrument measures the hydrodynamic parameters of a propeller model, involving dynamic strain testing technology. In particular, the two-component sensor can operate stably and reliably at high speeds and accurately measure the hydrodynamic characteristics of the propeller model during rotation.

[0004] Propeller power units are typically installed in the test section of a cavitation tank. The air bubble content in the cavitation tank is strictly limited, and the degassing process requires the power unit to withstand a certain negative pressure. This necessitates a tight seal between the cavitation tank and the propeller power unit, as well as between the cavitation tank and the test section. Furthermore, within the cavitation tank test section, precise positioning of the propeller power unit is required. Existing technologies necessitate complex mechanisms for positioning and adjustment, resulting in high costs and cumbersome operation. Summary of the Invention

[0005] The technical objective of this invention is to provide a propeller power unit for cavitation water tanks, in order to solve the problem of how to precisely adjust and control the propeller power unit.

[0006] To solve the above problems, the technical solution of the present invention is as follows:

[0007] A propeller power unit for a cavitation water tank, comprising:

[0008] Base, lifting and angle-changing mechanism, connecting components and detection components;

[0009] The base is fixed above the cavitation water cylinder and connected to the upward-facing working window of the cavitation water cylinder, and is used to support the lifting and angle-changing mechanism and connecting components.

[0010] The bottom of the lifting and angle-changing mechanism is connected to the base by a cylindrical sleeve pair. The left and right symmetrical parts of the lifting and angle-changing mechanism are fixedly connected to one end of the connecting component. The other end of the connecting component passes through the base and enters the cavitation water cylinder, and is fixedly connected to the detection component. The lifting and angle-changing mechanism is used to drive the connecting component and, through the connecting component, change the attitude of the detection component. The detection component is used to install a propeller to carry out hydrodynamic testing.

[0011] The combined part of the base and the air bubble water cylinder is consistent with the size of the inner wall of the air bubble water cylinder;

[0012] The connecting assembly is hinged with the base when penetrating the bottom of the base, and a circular sealing ring is arranged at the hinge.

[0013] Specifically, the lifting angle changing mechanism comprises a sliding table, a transmission assembly, a side beam assembly and a cross beam which are symmetrically arranged on the left and right sides of the sliding table;

[0014] The left and right sides of the sliding table are connected with one end of the cross beam, and the other end of the cross beam is connected with the side beam assembly by a cylindrical sleeve pair; the lower part of the sliding table is connected with the connecting assembly; one end of the side beam assembly is connected with the base by a cylindrical sleeve pair;

[0015] The transmission assembly is used to drive the corresponding cross beam to slide up and down on the side beam assembly, and the transmission assemblies on both sides work independently.

[0016] Specifically, the transmission assembly comprises a screw rod, a nut, a motor and a speed reducer;

[0017] The motor is installed on both sides of the sliding table, the speed reducer is connected to the output end of the motor, one end of the screw rod is connected with the speed reducer, the other end of the screw rod is connected with the corresponding side beam assembly, and the nut is fixed on the middle part of the cross beam. The screw rod and the corresponding nut cooperate to form a sliding screw transmission pair.

[0018] Specifically, the side beam assembly comprises a left upper beam and a left lower beam arranged on the left side of the sliding table, and a right upper beam and a right lower beam arranged on the right side of the sliding table; the cross beam comprises a left cross beam and a right cross beam arranged on the left and right sides of the sliding table.

[0019] The left cross beam is driven by the corresponding transmission assembly to lift between the left upper beam and the left lower beam; one end of the left lower beam is connected with the left upper beam, and the other end of the left lower beam is connected with the base; the bearing in the left lower beam is connected with the corresponding screw rod.

[0020] The right cross beam is driven by the corresponding transmission assembly to lift between the right upper beam and the right lower beam; one end of the right lower beam is connected with the right upper beam, and the other end of the right lower beam is connected with the base; the bearing in the right lower beam is connected with the corresponding screw rod.

[0021] Further preferably, a main motor is also provided, which is arranged above the sliding table and used to provide rotating force to the connecting assembly.

[0022] Specifically, the connecting assembly comprises a connecting section and a flow guide, a first transmission shaft penetrating the connecting section from top to bottom, and a second transmission shaft penetrating the flow guide from top to bottom;

[0023] The top end of the connecting section is connected with the lower part of the sliding block, the bottom end of the connecting section is connected with the top end of the flow guide, and the bottom end of the flow guide is connected with the detection piece.

[0024] One end of the first transmission shaft is connected with the main motor through a shaft coupling, the other end of the first transmission shaft is connected with one end of the second transmission shaft, the other end of the second transmission shaft extends into the detection member, and is used for transmitting the rotating force of the main motor to the detection member.

[0025] The detection member is a power instrument main body, and the power instrument main body comprises a bevel gear pair, a two-component sensor, a third transmission shaft and a propeller shaft.

[0026] The other end of the second transmission shaft is connected with the bevel gear pair, the bevel gear pair is connected with the third transmission shaft, and the bevel gear pair is used for driving the third transmission shaft to rotate.

[0027] One end of the third transmission shaft close to the tail of the power instrument main body is connected with the propeller shaft, and the propeller shaft is used for mounting a propeller.

[0028] The two-component sensor is sleeved on the third transmission shaft, and is used for detecting an electric signal of the torque and the thrust force borne by the power instrument main body.

[0029] Further preferably, a high-speed slip ring is further arranged, the high-speed slip ring is sleeved on one end of the third transmission shaft close to the head of the power instrument main body, is connected with a signal compensator, and is used for signal compensation on the electric signal measured by the two-component sensor.

[0030] Compared with the prior art, the power instrument has the following advantages and positive effects:

[0031] The lifting and angle changing mechanisms are symmetrically arranged and independently controlled, so that the power instrument main body can be simply and conveniently lifted and lowered, and the pitch angle and the roll angle of the power instrument main body can be simulated. BRIEF DESCRIPTION OF DRAWINGS

[0032] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application.

[0033] Figure 1 A schematic diagram of the whole propeller power instrument for a cavitation water tank is provided in the present application;

[0034] Figure 2 A sectional view of the propeller power instrument for the cavitation water tank is provided in the present application;

[0035] Figure 3 A base schematic diagram is provided in the present application;

[0036] Figure 4 A sealing structure schematic diagram of the base is provided in the present application;

[0037] Figure 5The schematic diagram of the connecting section structure provided by the present application is shown in the figure.

[0038] Figure 6 The schematic diagram of the main body structure of the power instrument provided by the present application is shown in the figure.

[0039] Figure 7 The schematic diagram of the main body of the power instrument provided by the present application is shown in the figure.

[0040] Figure 8 The schematic diagram of the main body of the power instrument provided by the present application is shown in the figure.

[0041] Explanation of reference signs

[0042] 1: base; 2: lifting angle changing mechanism; 201: sliding table; 202: left upper beam; 203: left lower beam; 204: left cross beam; 205: right upper beam; 206: right lower beam; 207: right cross beam; 3: connecting assembly; 301: connecting section; 302: first transmission shaft; 303: flow guide; 304: second transmission shaft; 4: detection piece; 401: bevel gear pair; 402: two-component sensor; 403: third transmission shaft; 404: paddle shaft; 405: high-speed slip ring; 5: main motor. DETAILED DESCRIPTION

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific implementation manners of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without any creative effort, and other embodiments can also be obtained.

[0044] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0045] The propeller power instrument for the cavitation water tank provided by the present application will be further described in detail below in combination with the drawings and specific embodiments. The advantages and features of the present application will be more clear according to the following description and claims.

[0046] EMBODIMENT

[0047] Reference Figures 1 to 8 The present embodiment provides a propeller power instrument for a cavitation water tank, which includes a base 1, a lifting angle changing mechanism 2, a connecting assembly 3 and a detection piece 4.

[0048] Referring to Figures 1 to 4 , the test section of the cavitation water tunnel is provided with a working window for replacing various test models and taking photographs. The working window of the upward cavitation water tunnel is fixed with a base 1, and the base 1 is provided with a through hole above and below and has a hollow structure inside. The size of the working window matches the hole at the bottom of the base 1, and a connecting assembly 3 can be subsequently extended into the cavitation water tunnel through the base 1 below, that is, the connecting assembly 3 enters from above the base 1 and extends into the cavitation water tunnel from the working window. Therefore, the main function of the base 1 is to support the connecting assembly 3 and the lifting and angle changing mechanism 2 which will be mentioned later. For example, in order to minimize the influence of the test section window on the flow field, the joint between the base 1 and the test section window is kept consistent with the size of the inner wall of the test section water tank. The connecting assembly 3 and the base 1 are hinged through a ball bearing and a ball bearing hinge seat, so that the connecting assembly 3 can still swing, and an O-shaped sealing ring is arranged at the hinge to maintain the sealing of the cavitation water tunnel. Figure 4

[0049] Referring to Figure 2 , the bottom of the lifting and angle changing mechanism 2 is connected with the base 1 through a cylindrical sleeve pair, so that the bottom of the lifting and angle changing mechanism 2 still has a degree of freedom. The left and right symmetrical parts of the lifting and angle changing mechanism 2 are fixedly connected with one end of the connecting assembly 3, the other end of the connecting assembly 3 extends through the base 1 and into the cavitation water tunnel, and is fixedly connected with the detection piece 4. The lifting and angle changing mechanism 2 can drive the connecting assembly 3, and change the posture of the detection piece 4 through the connecting assembly 3, so as to realize the pitch of the propeller shaft 404. Figure 7 and Figure 8 For example, the detection piece 4 mainly functions to install a propeller to complete the hydrodynamic test.

[0050] Specifically, the middle of the lifting and angle changing mechanism 2 is a sliding table 201, which is located above the center of the base 1 in the unstarted state, so that the lower part of the sliding table 201 is fixedly connected with the connecting assembly 3, and the transmission assembly, the side beam assembly and the cross beam located on the left and right sides of the sliding table 201.

[0051] For the convenience of description, but not limited thereto, the side beam assembly includes a left upper beam 202 and a left lower beam 203 arranged on the left side of the sliding table 201, and a right upper beam 205 and a right lower beam 206 arranged on the right side of the sliding table 201. The cross beam includes a left cross beam 204 and a right cross beam 207 arranged on the left and right sides of the sliding table 201.

[0052] The left cross beam 204 is driven by the corresponding transmission assembly on the left side, so that the left cross beam 204 can realize lifting between the left upper beam 202 and the left lower beam 203. The left upper beam 202 is located above and connected with the left lower beam 203, and the other end of the left lower beam 203 is connected with the base 1 through a cylindrical sleeve pair.

[0053] ​The right cross beam 207 is driven by the corresponding transmission assembly on the right side, so that the right cross beam 207 can be lifted between the right upper beam 205 and the right lower beam 206. The right upper beam 205 is above the right lower beam 206, and the other end of the right lower beam 206 is connected to the base 1 by a cylindrical sleeve pair.

[0054] The left and right sides of the sliding table 201 are connected to one end of the left cross beam 204 and the right cross beam 207 respectively, and the other end of the two cross beams is connected to the corresponding left and right lower beams by a cylindrical sleeve pair.

[0055] Referring to Figure 2 , the transmission assembly is used to drive the corresponding cross beam to slide up and down on the side beam assembly, and the left and right sides are independent transmission chains. Specifically, the transmission assembly includes a screw, a nut, a motor and a speed reducer. The motor is installed on both sides of the sliding table 201, the speed reducer is connected to the output end of the motor, and one end of the screw is connected to the speed reducer through a shaft coupling. The other end of the screw on the left and right sides is connected to the bearing in the left and right lower beams. The nut is fixed to the middle of the cross beam, and the screw and the corresponding nut are threadedly connected to form a sliding screw transmission pair. By rotating the motor through the speed reducer, the screw is rotated, thereby pulling or pushing away the corresponding cross beam. When the cross beam is retracted, the whole body is inwardly retracted, and the cross beam moves upward; otherwise, the whole body is outwardly expanded, and the cross beam moves downward. When the left side is retracted and the right side is expanded, the lifting angle changing mechanism 2 will tilt to the right as a whole, and will drive the connecting assembly 3 to tilt to the right, and the detection piece 4 will look down. When the left side is expanded and the right side is retracted, the lifting angle changing mechanism 2 will tilt to the left as a whole, and will drive the connecting assembly 3 to tilt to the left, and the detection piece 4 will look up. The screw and the screw described above specifically adopt trapezoidal threads.

[0056] More preferably, referring to Figure 2 , a main motor 5 is also provided, which is arranged above the sliding table 201 and is used to provide rotating force to the connecting assembly 3. Referring to Figure 5 and Figure 6 , the connecting assembly 3 includes a connecting section 301 and a flow guide 303, as well as a first transmission shaft 302 penetrating the connecting section 301 from top to bottom, and a second transmission shaft 304 penetrating the flow guide 303 from top to bottom. Among them, the connecting section 301 is in a cylindrical structure, and the cross section of the flow guide 303 is in an inverted trapezoidal structure. The top end of the connecting section 301 is connected to the lower side of the sliding block, the bottom end of the connecting section 301 is connected to the top end of the flow guide 303, and the bottom end of the flow guide 303 is connected to the detection piece 4. One end of the first transmission shaft 302 is connected to the main motor 5 through a shaft coupling, the other end of the first transmission shaft 302 is connected to one end of the second transmission shaft 304, and the other end of the second transmission shaft 304 extends into the detection piece 4, and the rotating force of the main motor 5 can be transmitted to the detection piece 4 in sequence.

[0057] Referring to Figure 6In the embodiment, the detecting member 4 is a dynamometer main body, which comprises a bevel gear pair 401, a two-component sensor 402, a third transmission shaft 403 and a propeller shaft 404. The second transmission shaft 304 extends into the dynamometer main body and is connected with the bevel gear pair 401. The bevel gear pair 401 is also connected with the third transmission shaft 403, which is used to change the rotation direction of the second transmission shaft 304 to that of the third transmission shaft 403. The third transmission shaft 403 is connected with the propeller shaft 404 at the end close to the tail of the dynamometer main body, and the propeller shaft 404 is used to install a propeller. The two-component sensor 402 is sleeved on the third transmission shaft 403 and is used to detect the electric signals of the torque and the thrust force borne by the dynamometer main body. Preferably, a high-speed slip ring 405 is also sleeved on the end of the third transmission shaft 403 close to the head of the dynamometer main body, which is connected with a signal compensator and is used to compensate the electric signals measured by the two-component sensor 402.

[0058] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments. Even if various changes are made to the present application, as long as the changes fall within the scope of the claims of the present application and equivalent technologies thereof, they still fall within the protection scope of the present application.

Claims

1. A propeller power instrument for a cavitation water tank, characterized in that, include: Base, lifting and angle-changing mechanism, connecting components and detection components; The base is fixed above the cavitation water cylinder and connected to the upward-facing working window of the cavitation water cylinder, and is used to support the lifting and angle-changing mechanism and the connecting assembly; The bottom of the lifting and angle-changing mechanism is connected to the base via a cylindrical sleeve pair. The left and right symmetrical parts of the lifting and angle-changing mechanism are fixedly connected to one end of the connecting assembly. The other end of the connecting assembly passes through the base and enters the cavitation water cylinder, and is fixedly connected to the detection element. The lifting and angle-changing mechanism is used to drive the connecting assembly and, through the connecting assembly, to change the attitude of the detection element. The detection element is used to install a propeller to carry out hydrodynamic testing. The lifting and angle-changing mechanism includes a slide table, and a transmission assembly, a side beam assembly, and a crossbeam symmetrically arranged on the left and right sides of the slide table; The left and right sides of the slide are respectively connected to one end of the crossbeam, and the other end of the crossbeam is connected to the side beam assembly by a cylindrical sleeve pair; the bottom of the slide is connected to the connecting assembly; one end of the side beam assembly is connected to the base by a cylindrical sleeve pair. The transmission assembly is used to drive the corresponding crossbeam to slide up and down on the side beam assembly, and the transmission assemblies on both sides work independently of each other.

2. The propeller power unit for a cavitation water tank according to claim 1, characterized in that, The joint between the base and the cavitation water cylinder has the same dimensions as the inner wall of the cavitation water cylinder. When the connecting component passes through the bottom of the base, it is hinged to the base, and a circular sealing ring is provided at the hinge.

3. The propeller power unit for a cavitation water tank according to claim 1, characterized in that, The transmission assembly includes a screw, a nut, a motor, and a reducer; The motors are respectively installed on both sides of the slide table, the reducer is connected to the output end of the motor, one end of the screw is connected to the reducer, the other end of the screw is connected to the corresponding side beam assembly, the nut is fixed in the middle of the crossbeam, and the screw and the corresponding nut cooperate with each other to form a sliding helical transmission pair.

4. The propeller power unit for a cavitation water tank according to claim 3, characterized in that, The side beam assembly includes an upper left beam and a lower left beam located on the left side of the slide table. The upper right beam and the lower right beam are on the right side; the crossbeam includes a left crossbeam and a right crossbeam located on the left and right sides of the slide table; The left crossbeam is driven by the corresponding transmission assembly to move up and down between the upper left beam and the lower left beam; one end of the lower left beam is connected to the upper left beam, and the other end of the lower left beam is connected to the base; the bearing inside the lower left beam is connected to the corresponding screw. The right crossbeam is driven by the corresponding transmission assembly to move up and down between the upper right beam and the lower right beam; one end of the lower right beam is connected to the upper right beam, and the other end of the lower right beam is connected to the base; the bearing inside the lower right beam is connected to the corresponding screw.

5. The propeller power unit for a cavitation water tank according to claim 1, characterized in that, It also includes a main motor, which is located above the slide table and is used to provide rotational power to the connecting assembly.

6. The propeller power unit for a cavitation water tank according to claim 5, characterized in that, The connecting assembly includes a connecting section and a flow guide, as well as a first drive shaft passing through the connecting section from top to bottom, and a second drive shaft passing through the flow guide from top to bottom; The top end of the connecting section is connected to the bottom of the slide table, the bottom end of the connecting section is connected to the top end of the guide member, and the bottom end of the guide member is connected to the detection member. One end of the first drive shaft is connected to the main motor via a coupling, and the other end of the first drive shaft is connected to one end of the second drive shaft. The other end of the second drive shaft extends into the detection element to transmit the rotational power of the main motor to the detection element.

7. The propeller power unit for a cavitation water tank according to claim 6, characterized in that, The detection component is the main body of the power instrument, which includes a bevel gear pair, a two-component sensor, a third transmission shaft, and a propeller shaft. The other end of the second drive shaft is connected to the bevel gear pair, which is connected to the third drive shaft and is used to drive the third drive shaft to rotate via the bevel gear pair; The third drive shaft is connected to the propeller shaft at one end near the tail of the power unit body, and the propeller shaft is used to mount the propeller. The two-component sensor is mounted on the third transmission shaft and is used to detect the electrical signals of the torque and push-pull force borne by the main body of the power instrument.

8. The propeller power unit for a cavitation water tank according to claim 7, characterized in that, A high-speed slip ring is also provided, which is sleeved on the third drive shaft near the main body of the power instrument. One end of the head is connected to a signal compensator for compensating the electrical signal measured by the two-component sensor.

Images