Kaplan turbine based on digital signal feedback

Abstract

The utility model relates to a Kaplan turbine based on digital signal feedback. The Kaplan turbine based on digital signal feedback comprises a runner structure, a main shaft, an oil head and a feedback mechanism. The feedback mechanism comprises a magnetostriction displacement sensor installed on the main shaft, a metal guide rod with one end connected with the magnetostriction displacement sensor, a magnetic ring installed on the operation oil cylinder, a conductive slip ring installed on the oil receiver and a wire electrically connected between the magnetostriction displacement sensor and the conductive slip ring. The other end of the metal guide rod penetrates through the magnetic ring and is connected with the operation oil cylinder in a sliding mode. According to the Kaplan turbine based on digital signal feedback, static-dynamic transmission of the digital signals can be achieved, the opening degree of the blades can be accurately measured, meanwhile, the major potential safety hazard that a unit is shut down due to accidents caused by the fact that a feedback rod of a traditional Kaplan turbine is prone to bending deformation, defects and the like is eliminated, and safe and stable operation of the unit is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of propeller-type water turbines, in particular to a propeller-type water turbine based on digital signal feedback. Background Art

[0002] The propeller turbine generally adopts a propeller runner structure. This efficient propeller runner is the premise and guarantee for the power station to obtain the maximum benefit. The propeller turbine can change its blades with the change of water head and load, so that the turbine can always maintain efficient and stable operation under the coordinated working condition. The operating oil pipe of the traditional propeller turbine is installed in the center hole of the main shaft. The operating oil pipe is composed of two inner and outer pressure oil chambers with two seamless steel pipes. The upper part is connected to the oil receiver and the lower part is connected to the runner piston rod. The rotation angle of the runner blade is adjusted by the feedback speed of the inner operating oil pipe and the return mechanism, so that the load and start and stop operations of the unit can be adjusted. The rotation angle of the runner blade is determined by the displacement of the piston. The displacement of the piston is measured by the mechanical feedback of the feedback rod to connect the pull-rope displacement sensor to realize the function of measuring the blade opening.

[0003] However, this method of using a feedback rod for mechanical feedback has the problem of the feedback rod being too long. If the feedback rod is too long, it will be difficult to ensure coaxiality, and the feedback rod will also be affected by the main shaft swing and its own weight. During long-term operation of the power station, it will grind against the oil receiver, operating oil pipe, etc., causing the feedback rod to bend and deform, thereby affecting the feedback accuracy, and causing the blade relay to respond slowly and the coordinated working condition to be unstable. Utility Model Content

[0004] Based on this, it is necessary to provide a propeller turbine based on digital signal feedback which is easy to install, has sensitive feedback and high measurement accuracy.

[0005] A propeller-type water turbine based on digital signal feedback, characterized in that it includes

[0006] The wheel structure comprises a wheel body with a hollow structure, an operating oil cylinder and a piston rod; one end of the piston rod is fixedly connected to the wheel body, and the other end is suspended in the wheel body; the operating oil cylinder is a hollow structure with one end open, and a sealing sleeve is slidably arranged on the end of the piston rod suspended in the air;

[0007] A main shaft, one end of which is mounted on the rotor body;

[0008] An oil receiver is mounted on the other end of the main shaft;

[0009] The feedback mechanism comprises a magnetostrictive displacement sensor mounted on the main shaft, a metal guide rod connected to the magnetostrictive displacement sensor at one end, a magnetic ring mounted on the operating oil cylinder, a conductive slip ring mounted on the oil receiver, and a wire electrically connected between the magnetostrictive displacement sensor and the conductive slip ring; the other end of the metal guide rod passes through the magnetic ring and is slidably connected to the operating oil cylinder.

[0010] In one of the embodiments, the magnetostrictive displacement sensor is installed at a portion of the piston rod located in the operating cylinder.

[0011] In one of the embodiments, a mounting groove is formed at one end of the piston rod located in the operating cylinder; a wire hole connecting the mounting groove and the outside is formed on the piston rod; the magnetostrictive displacement sensor is installed in the mounting groove; one end of the wire passes through the wire hole and is connected to the magnetostrictive displacement sensor.

[0012] In one of the embodiments, the rotating wheel structure also includes a sealing cover; the sealing cover is detachably installed at the mounting groove to seal and cover the mounting groove; a connecting hole is opened on the sealing cover; one end of the metal guide rod passes through the connecting hole and is connected to the magnetostrictive displacement sensor.

[0013] In one embodiment, the metal guide rod is coaxially arranged with the piston rod.

[0014] In one of the embodiments, a sliding hole is provided on the inner wall of the operating cylinder at a position opposite to the end face of the piston rod away from the main shaft; the end of the metal guide rod away from the magnetostrictive displacement sensor can be slidably inserted into the sliding hole and extended to the outside of the operating cylinder.

[0015] In one embodiment, the rotating wheel structure also includes a guide rod shell cover; the guide rod shell cover is a hollow shell structure with an opening at one end; the guide rod shell cover has an open end which is fixed to the outer wall of the operating cylinder away from the main shaft and is connected to the sliding hole.

[0016] In one embodiment, the wire is passed through the main shaft.

[0017] The above-mentioned propeller turbine based on digital signal feedback, when in use, uses magnetostrictive displacement sensor, metal guide rod and magnetic ring for non-contact displacement measurement, and uses wire for signal transmission, and uses conductive slip ring to output the measured SSI digital signal, so that the feedback mechanism realizes static-dynamic transmission of digital signal, accurately measures the opening of the blade, and the SSI digital signal output by the magnetostrictive displacement sensor has strong anti-interference ability, high precision, and is easy to process and transmit during the transmission process. Because the entire signal acquisition and signal transmission process adopts a non-contact method, the long-term online and continuous measurement of the blade opening will not cause wear of the inductive components. Therefore, the setting of the above-mentioned feedback mechanism makes the measurement of the blade opening in the propeller turbine based on digital signal feedback more accurate and more sensitive, and has the advantages of reliable operation and long service life. At the same time, it eliminates the major safety hazards of the traditional propeller turbine caused by the feedback rod being easily bent and deformed, and defects, etc., which cause the unit to shut down accidentally, ensuring the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a propeller-type water turbine based on digital signal feedback in a preferred embodiment of the utility model;

[0019] Figure 2 for Figure 1 The diagram shown is a structural schematic diagram of the piston rod in a propeller turbine based on digital signal feedback.

[0020] Explanation of reference numerals: 100, propeller turbine based on digital signal feedback; 110, impeller structure; 111, impeller body; 112, operating cylinder; 113, piston rod; 1131, mounting groove; 1132, wire hole; 114, sealing cover; 1141, connecting hole; 115, guide rod housing cover; 120, main shaft; 130, oil receiver; 140, feedback mechanism; 141, magnetostrictive displacement sensor; 142, metal guide rod; 143, magnetic ring; 144, conductive slip ring; 145, wire. DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] When describing positional relationships, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there can be an intermediate element. It is also understood that when an element is referred to as being "between" two elements, it can be the only one between the two elements, or there can be one or more intermediate elements.

[0024] In the case of using “including”, “having”, and “comprising” described herein, another component may be added unless a clear limiting term such as “only”, “consisting of”, etc. is used. Unless mentioned otherwise, a term in the singular form may include a plural form and should not be understood as being one in number.

[0025] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0026] Figure 1 The structure of a propeller-type water turbine based on digital signal feedback in an embodiment of the utility model is shown. For the convenience of description, the accompanying drawings only show the structure related to the embodiment of the utility model.

[0027] See also Figure 1 The propeller-type water turbine 100 based on digital signal feedback in a preferred embodiment of the utility model includes a runner structure 110 , a main shaft 120 , an oil receiver 130 and a feedback mechanism 140 .

[0028] The wheel structure 110 includes a wheel body 111 having a hollow structure, an operating cylinder 112 and a piston rod 113. One end of the piston rod 113 is fixedly connected to the wheel body 111, and the other end is suspended in the wheel body 111. The operating cylinder 112 is a hollow structure with one end open, and a sealing sleeve is slidably arranged on the end of the piston rod 113 suspended in the air.

[0029] One end of the main shaft 120 is mounted on the rotor body 111 , and the oil receiver 130 is mounted on the other end of the main shaft 120 .

[0030] The feedback mechanism 140 includes a magnetostrictive displacement sensor 141 installed on the main shaft 120, a metal guide rod 142 connected to the magnetostrictive displacement sensor 141 at one end, a magnetic ring 143 installed on the operating oil cylinder 112, a conductive slip ring 144 installed on the oil receiver 130, and a wire 145 electrically connected between the magnetostrictive displacement sensor 141 and the conductive slip ring 144. The other end of the metal guide rod 142 passes through the magnetic ring 143 and is slidably connected to the operating oil cylinder 112. Among them, the magnetostrictive displacement sensor 141 can be located at any position of the piston rod 113, as long as it is ensured that the magnetostrictive displacement sensor 141 will not interfere with other components during the operation of the above-mentioned propeller-type water turbine 100 based on digital signal feedback, and that its own function can be achieved.

[0031] In the propeller turbine 100 based on digital signal feedback, the opening of the blade is related to the position of the operating piston on the piston rod 113 in the operating cylinder 112, that is, by obtaining the position change of the piston rod 113 in the operating cylinder 112 through the feedback mechanism 140, the change information of the blade opening can be measured. Therefore, if you want to obtain the opening of the blade, you only need to measure the moving position of the piston rod 113 in the operating cylinder 112.

[0032] Specifically, as the piston rod 113 moves in the operating cylinder 112, the relative position between the magnetostrictive displacement sensor 141 and the magnetic ring 143 will change, and the active magnetic field generated by the magnetic ring 143 will also move to a new position accordingly. At this time, the magnetostrictive displacement sensor 141 obtains the current position signal by moving the metal guide rod 142 in the active magnetic field. At the same time, the magnetostrictive displacement sensor 141 transmits the collected SSI digital signal to the conductive slip ring 144 using the wire 145, thereby feeding back the blade opening signal to the oil receiver 130. Among them, the measurement principle of the magnetostrictive displacement sensor 141 is the existing technology and will not be repeated here.

[0033] Therefore, the feedback mechanism 140 can realize static-dynamic transmission of digital signals and accurately measure the opening of the blades. In addition, the SSI digital signal output by the magnetostrictive displacement sensor 141 has strong anti-interference ability, high precision, and is easy to process and transmit during the transmission process.

[0034] Moreover, the entire signal acquisition and signal transmission process adopts a non-contact method, so the long-term online and continuous measurement of the blade opening will not cause wear of the sensing components, that is, the signal acquisition and signal transmission process does not need to be achieved through the sliding of the feedback rod as in the traditional mechanical feedback device, which overcomes the problems of the traditional mechanical feedback device caused by the feedback rod being too long, causing inconvenience in installation, low feedback accuracy, and short service life. It not only extends the service life of the propeller turbine 100 based on digital signal feedback, but also makes the blade opening measurement more accurate and responsive.

[0035] Furthermore, the magnetostrictive displacement sensor 141, the metal guide rod 142 and the magnetic ring 143 are used for non-contact displacement measurement, and the wire 145 is used for signal transmission, thereby eliminating the problem that the feedback rod in the traditional mechanical feedback device is easily bent and deformed, easily defective, and even causes a major safety hazard of accidental shutdown of the unit due to the swing and deadweight of the main shaft 120. Therefore, the setting of the above-mentioned feedback mechanism 140 can ensure the safe and stable operation of the unit.

[0036] In some embodiments, the magnetostrictive displacement sensor 141 is installed at the position where the piston rod 113 is located in the operating cylinder 112. By installing the magnetostrictive displacement sensor 141 in the operating cylinder 112, the length of the metal guide rod 142 can be shortened to further improve the measurement accuracy of the blade opening measurement and make the installation of the feedback mechanism 140 more convenient.

[0037] Please also read Figure 2 Further, in some embodiments, a mounting groove 1131 is provided at one end of the piston rod 113 located in the operating cylinder 112. A wire hole 1132 is formed on the piston rod 113 to connect the mounting groove 1131 and the outside. The magnetostrictive displacement sensor 141 is installed in the mounting groove 1131. One end of the wire 145 passes through the wire hole 1132 and is connected to the magnetostrictive displacement sensor 141. The metal guide rod 142 can be connected to the magnetostrictive displacement sensor 141 through the opening of the mounting groove 1131, and can also be connected to the magnetostrictive displacement sensor 141 through other through holes opened on the piston rod 113 and connected to the mounting groove 1131.

[0038] In this way, the magnetostrictive displacement sensor 141 is completely sunk into the piston rod 113 and does not occupy additional internal space of the operating cylinder 112 , which is beneficial to reducing the structural volume of the rotor body 111 and reducing the difficulty of installing various parts in the rotor body 111 .

[0039] Furthermore, in some embodiments, the rotating wheel structure 110 further includes a sealing cover 114. The sealing cover 114 is detachably mounted on the mounting groove 1131, so that the sealing cover 114 closes the mounting groove 1131.

[0040] In this way, the setting of the sealing cover 114 will form a closed space surrounded by the inner wall of the installation groove 1131 and the sealing cover 114 in the piston rod 113, which plays a protective role and can prevent the pressure oil in the operating cylinder 112 from entering the installation groove 1131 and affecting the use of the magnetostrictive displacement sensor 141, so as to increase the service life of the magnetostrictive displacement sensor 141, thereby further extending the service life of the propeller-type turbine 100 based on digital signal feedback.

[0041] In some embodiments, the metal guide rod 142 is coaxially arranged with the piston rod 113. Therefore, the moving direction of the metal guide rod 142 is consistent with the moving direction of the piston rod 113 in the operating cylinder 112, further improving the measurement accuracy.

[0042] Specifically, when the piston rod 113 is provided with a mounting groove 1131, and the wheel structure 110 further includes a sealing cover 114, the mounting groove 1131 is located on the end surface of the piston rod 113 away from the main shaft 120. Similarly, the sealing cover 114 can also be detachably installed on the end surface of the piston rod 113 away from the main shaft 120, so that the sealing cover 114 closes the opening of the mounting groove 1131. At this time, the sealing cover 114 is provided with a connecting hole 1141, and one end of the metal guide rod 142 is penetrated through the connecting hole 1141 and connected to the magnetostrictive displacement sensor 141. The magnetostrictive displacement sensor 141 can be installed on the inner wall of the mounting groove 1131 or on the sealing cover 114. When the magnetostrictive displacement sensor 141 is installed on the sealing cover 114, one end of the metal guide rod 142 is also installed on the sealing cover 114 and connected to the magnetostrictive displacement sensor 141 in the connecting hole 1141. More specifically, the depth direction of the wire hole 1132 is consistent with the center axis direction of the piston rod 113 , so as to reduce the difficulty of installing the wire 145 and shorten the length of the wire 145 .

[0043] In some embodiments, a sliding hole (not marked in the figure) penetrating the side wall of the operating cylinder 112 is opened at a position opposite to the end face of the piston rod 113 away from the main shaft 120, and the end of the metal guide rod 142 away from the magnetostrictive displacement sensor 141 can be slidably inserted into the sliding hole.

[0044] In this way, during the piston movement of the piston rod 113 and the operating cylinder 112, the metal guide rod 142 can pass through the sliding hole and extend to the outside of the operating cylinder 112, so as to reduce the internal space of the operating cylinder 112 and the side wall thickness of the operating cylinder 112 while ensuring the working distance of the metal guide rod 142, which is beneficial to reducing the volume of the operating cylinder 112, thereby ensuring that there is sufficient installation space in the wheel structure 110, further reducing the difficulty of installation.

[0045] In some embodiments, the wheel structure 110 further includes a guide rod cover 115. The guide rod cover 115 is a hollow shell structure with one end open. The guide rod cover 115 has an open end fixed to the outer wall of the operating cylinder 112 away from the main shaft 120 and connected to the sliding hole.

[0046] The guide rod cover 115 seals the sliding hole. Even if the pressure oil leaks between the metal guide rod 142 and the sliding hole, the pressure oil will only enter the guide rod cover 115, which greatly reduces the probability that the pressure oil in the operating cylinder 112 will leak into the wheel body 111 as the metal guide rod 142 slides in the sliding hole, thereby reducing the probability of water pollution caused by the leakage of pressure oil.

[0047] In some embodiments, the wire 145 is inserted into the main shaft 120. That is, the wire 145 is inserted into the inner cavity of the main shaft 120 for installing the pressure oil pipe, which not only makes the structure of the propeller-type water turbine 100 based on digital signal feedback more compact, but also improves the safety of the use of the wire 145, reduces the probability of the wire 145 being hooked during the operation of the unit, and further improves the safety and reliability of the unit operation.

[0048] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0049] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A propeller turbine based on digital signal feedback, characterized in that: include The wheel structure comprises a wheel body with a hollow structure, an operating oil cylinder and a piston rod; one end of the piston rod is fixedly connected to the wheel body, and the other end is suspended in the wheel body; the operating oil cylinder is a hollow structure with one end open, and a sealing sleeve is slidably arranged on the end of the piston rod suspended in the air; A main shaft, one end of which is mounted on the rotor body; An oil receiver is mounted on the other end of the main shaft; The feedback mechanism comprises a magnetostrictive displacement sensor mounted on the main shaft, a metal guide rod connected to the magnetostrictive displacement sensor at one end, a magnetic ring mounted on the operating oil cylinder, a conductive slip ring mounted on the oil receiver, and a wire electrically connected between the magnetostrictive displacement sensor and the conductive slip ring; the other end of the metal guide rod passes through the magnetic ring and is slidably connected to the operating oil cylinder.

2. The propeller-type water turbine based on digital signal feedback according to claim 1, characterized in that: The magnetostrictive displacement sensor is installed at the position where the piston rod is located inside the operating cylinder.

3. The propeller-type water turbine based on digital signal feedback according to claim 2, characterized in that: A mounting groove is formed at one end of the piston rod located in the operating cylinder; a wire hole connecting the mounting groove and the outside is formed on the piston rod; the magnetostrictive displacement sensor is installed in the mounting groove; one end of the wire passes through the wire hole and is connected to the magnetostrictive displacement sensor.

4. The propeller-type water turbine based on digital signal feedback according to claim 3, characterized in that: The rotating wheel structure also includes a sealing cover; the sealing cover is detachably mounted on the mounting groove to seal and cover the mounting groove; a connecting hole is provided on the sealing cover; one end of the metal guide rod passes through the connecting hole and is connected to the magnetostrictive displacement sensor.

5. The propeller-type water turbine based on digital signal feedback according to claim 1, characterized in that: The metal guide rod is coaxially arranged with the piston rod.

6. The propeller-type water turbine based on digital signal feedback according to claim 1, characterized in that: A sliding hole is provided on the inner wall of the operating cylinder at a position opposite to the end face of the piston rod away from the main shaft; the end of the metal guide rod away from the magnetostrictive displacement sensor can be slidably penetrated in the sliding hole and extended to the outside of the operating cylinder.

7. The propeller-type water turbine based on digital signal feedback according to claim 6, characterized in that: The rotating wheel structure also includes a guide rod shell cover; the guide rod shell cover is a hollow shell structure with an open end; the guide rod shell cover has an open end fixed to the outer wall of the operating cylinder away from the main shaft and communicated with the sliding hole.

8. The propeller-type water turbine based on digital signal feedback according to claim 1, characterized in that: The wire is passed through the main shaft.

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