Oil head structure suitable for low water head and large flow and axial-flow movable propeller turbine

Abstract

The utility model relates to an oil head structure suitable for low water head and large flow and an axial-flow movable propeller turbine. The oil head structure suitable for the low water head and the large flow comprises an oil head base, a fixing sleeve and a rotating body. According to the oil head structure suitable for the low water head and the large flow, on one hand, compared with an oil head structure needing to be provided with three floating tiles and form two high-pressure oil cavities in the prior art, the rotating body rotatably penetrates through the fixing sleeve to form a whole, a floating tile structure is omitted, and the two high-pressure oil cavities do not need to be arranged; the utility model has the advantages of simple structure, light weight and small volume, ensures that the integral rigid strength is high, and has better durability; and on the other hand, compared with an oil head structure provided with three oil ways in the prior art, the first oil port is communicated with the first oil way, the second oil port is communicated with the second oil way, two operation oil ways are formed, the size can be further reduced, the interior of a runner cavity is cleaner, and the risk of oil leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of axial flow water turbines for precipitation, in particular to an oil receiver structure suitable for low head and large flow rate and an axial flow Kaplan turbine. Background Technique

[0002] When developing low head and large flow rate hydraulic resources, due to the high unit speed and large unit flow rate of the axial flow Kaplan turbine, and the wide selection range of unit flow rate and unit speed under rated conditions, technical and economic considerations can be taken into account, and it has the advantages of full utilization of resources, investment savings, and high comprehensive benefits. Therefore, it is one of the best model choices when developing low head power stations. The axial flow Kaplan turbine adopts a Kaplan runner structure, and the oil receiver is an important component of the rotating components of the Kaplan turbine. The oil receiver forms an oil circuit between the pressure oil from the governor and the movable connecting body to realize the adjustment of the runner blades.

[0003] However, in the traditional oil receiver structure (as shown in Figure 1 ), the oil circuit is divided into three paths in total, namely the opening oil circuit 10, the closing oil circuit 20, and the pressure maintaining oil circuit 30. At the same time, a three-way floating tile 40 structure is adopted, which together with the oil receiver sleeve forms two high-pressure oil cavities 50 (the closing cavity and the opening cavity) respectively. This not only makes the structure of the oil receiver complex and large in volume, but also difficult to ensure the coaxiality of the three floating tiles 40, which is prone to eccentric wear, resulting in an increase in the gap between the floating tile 40 and the connecting body, leading to slow reaction of the blade servomotor, unstable combined adjustment condition, frequent start of the pressure oil pump, and in severe cases, even causing sticking and burning of the floating tile. Summary of the Utility Model

[0004] Based on this, it is necessary to provide an oil receiver structure suitable for low head and large flow rate and an axial flow Kaplan turbine with a simple structure, small volume, and capable of solving problems such as slow reaction of the blade servomotor, unstable combined adjustment condition, frequent start of the pressure oil pump, sticking and burning of the floating tile caused by the difficulty in ensuring the coaxiality of the three floating tiles.

[0005] An oil receiver structure suitable for low head and large flow rate includes:

[0006] An oil receiver base for fixing on the engine base of an axial flow Kaplan turbine;

[0007] A fixed sleeve, which is a hollow structure with an installation opening at one end; the fixed sleeve is fixed on the oil receiver base; the side wall of the fixed sleeve is provided with a first oil port and a second oil port;

[0008] A rotating body having independent first and second oil passages; one end of the rotating body is rotatably inserted into the fixed sleeve and slidably contacts the inner wall of the fixed sleeve, such that the first and second oil passages are respectively in sealed communication with the first and second oil ports; the other end of the rotating body extends out of the mounting opening, and the ends of the first oil passage remote from the first oil port and the second oil passage remote from the second oil port are both located outside the fixed sleeve.

[0009] In one embodiment, the fixed sleeve includes a sleeve body having a hollow cylindrical structure with openings at both ends, a thrust plate, and an end plate; the thrust plate and the end plate are respectively detachably fixed to both ends of the sleeve body; the end plate is formed with the mounting opening coaxially provided with the sleeve body.

[0010] The rotating body includes a first rotating section and a second rotating section connected in sequence; the diameter of the first rotating section is greater than that of the second rotating section; the first rotating section is rotatably inserted into the sleeve body; the second rotating section is rotatably inserted into the mounting opening, and the inner wall of the end plate abuts against the axial end face of the first rotating section.

[0011] In one embodiment, a first seal is further included; the first seal is disposed circumferentially around the sleeve body and clamped between the thrust plate and the end face of one end of the sleeve body.

[0012] In one embodiment, an oil accumulation cavity is formed between the thrust plate and the end face of the first rotating section remote from the second rotating section; the thrust plate is provided with an oil drain hole communicating with the oil accumulation cavity; an oil drain pipe is installed on the oil drain hole.

[0013] In one embodiment, independent first and second annular cavities are formed between the outer wall of the rotating body and the inner wall of the fixed sleeve; the first and second annular cavities are both disposed circumferentially around the rotating body; the first oil port and one end opening of the first oil passage are both in communication with the first annular cavity; the second oil port and the second oil passage are both in communication with the second annular cavity.

[0014] In one embodiment, the oil receiver base has a rotating mounting portion and a fixed mounting portion; the fixed mounting portion is fixedly connected to the fixed sleeve.

[0015] The oil receiver structure applicable to low head and large flow rate further includes a connecting body; the connecting body is rotatably installed on the rotating installation part, and one end is fixedly connected to the end of the rotating body outside the fixed sleeve; the connecting body has an independent first operating oil passage and a second operating oil passage therein; one ends of the first operating oil passage and the second operating oil passage are respectively communicated with the ends of the first oil passage far from the first oil port and the second oil passage far from the second oil port.

[0016] In one embodiment, a second seal and a third seal are provided at the connection between the rotating body and the connecting body; the second seal is arranged along the circumferential direction of the rotating body, and the openings at the ends of the first oil passage far from the first oil port and the second oil passage far from the second oil port are both located inside the second seal; the third seal is arranged along the circumferential direction of the opening at the end of the second oil passage far from the second oil port, and the opening at the end of the first oil passage far from the first oil port is located outside the third seal, and the opening at the end of the second oil passage far from the second oil port is located inside the third seal; and / or

[0017] The connecting body is rotatably installed in the rotating installation part through a shaft sleeve.

[0018] In one embodiment, the oil receiver base includes an annular fixing frame, a rotating seat and a fixed seat; the outer side of the annular fixing frame is used for connecting with the engine base; the fixed seat and the rotating seat are respectively detachably installed at both ends inside the annular fixing frame; the fixed seat forms the fixed installation part along the circumferential direction of the fixed sleeve; the rotating seat forms the rotating installation part along the circumferential direction of the connecting body.

[0019] In one embodiment, the fixed seat includes an annular plate arranged along the circumferential direction of the fixed sleeve and a thin plate connecting piece fixed on the inner wall of the annular plate; one end of the annular plate far from the thin plate connecting piece is detachably connected to the annular fixing frame; the thin plate connecting piece is detachably connected to one end of the fixed sleeve provided with the installation opening; the fixed sleeve and the annular plate are arranged in a dislocation manner in the direction perpendicular to the central axis direction of the fixed sleeve.

[0020] An axial flow and variable pitch water turbine includes the above-mentioned end face oil receiver structure applicable to low head and large flow rate and an engine; the fixed sleeve is fixed on the engine base.

[0021] The above-mentioned oil receiver structure applicable to low head and large flow rate and the Kaplan turbine, on the one hand, compared with the oil receiver structure in the prior art that requires three floating shoes and forms two high-pressure oil cavities, the rotating body is rotatably inserted into the fixed sleeve to form a whole, and the outer wall of the rotating body is in rotational contact with the inner wall of the fixed sleeve, canceling the floating shoe structure. The first oil port is directly connected to the first oil passage, and the second oil port is directly connected to the second oil passage, without the need to set two high-pressure oil cavities. It has the advantages of simple structure, light weight, and small volume, and ensures a relatively large overall rigid strength and better durability. On the other hand, compared with the oil receiver structure in the prior art that has three oil passages including an opening oil passage, a closing oil passage, and a pressure maintaining oil passage, the first oil port communicates with the first oil passage to form a high-pressure operation oil passage, and the second oil port communicates with the second oil passage to form another high-pressure operation oil passage. Only two operation oil passages are set, canceling the pressure maintaining oil passage, which is beneficial to further reducing the volume. It not only makes the runner body cavity cleaner but also reduces the risk of oil leakage. Brief Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of the oil receiver structure in the prior art;

[0023] Figure 2 is a schematic structural diagram of the oil receiver structure applicable to low head and large flow rate in the preferred embodiment of the present invention;

[0024] Figure 3 is Figure 2 a schematic structural diagram of the fixed sleeve in the oil receiver structure applicable to low head and large flow rate shown;

[0025] Figure 4 is Figure 2 a partial enlarged view of the oil receiver structure applicable to low head and large flow rate shown;

[0026] Figure 5 is Figure 2 a schematic structural diagram of the oil receiver base in the oil receiver structure applicable to low head and large flow rate shown.

[0027] Description of reference numerals: 100, oil receiver structure applicable to low head and large flow rate; 110, oil receiver base; 111, rotating mounting part; 112, fixed mounting part; 113, annular fixing frame; 114, rotating seat; 115, fixed seat; 1151, ring plate; 1152, thin plate connecting piece; 120, fixed sleeve; 121, mounting port; 122, first oil port; 123, second oil port; 124, sleeve body; 125, thrust plate; 126, end plate; 127, oil accumulation cavity; 130, rotating body; 131, first oil passage; 132, second oil passage; 133, first rotating section; 134, second rotating section; 135, first annular cavity; 136, second annular cavity; 140, first high-pressure oil pipe; 150, second high-pressure oil pipe; 160, first seal; 170, drain pipe; 180, connecting body; 181, first operating oil passage; 182, second operating oil passage; 191, second seal; 192, third seal; 201, shaft sleeve; 200, engine base. Detailed implementation manners

[0028] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present utility model more thorough and comprehensive.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] When describing the positional relationship, unless otherwise specified, when an element is referred to as being "on" another element, it can be directly on the other element or there may also be an intermediate element. It can also be 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 may also be one or more intermediate elements.

[0031] In the case of using "including", "having", and "comprising" described herein, unless a clear limiting term is used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, the singular form of a term can include the plural form and cannot be understood as having a quantity of one.

[0032] In addition, the attached drawings are not drawn to a scale of 1:1, and the relative dimensions of the components are only drawn by way of example in the attached drawings and not necessarily to the actual scale.

[0033] Please refer to Figure 2 , the present utility model provides an oil receiver structure 100 applicable to low head and large flow rate and a Kaplan turbine. Among them, the Kaplan turbine is applied to hydraulic resources with low head and large flow rate, including an oil receiver structure 100 applicable to low head and large flow rate and an engine. The oil receiver structure 100 applicable to low head and large flow rate is fixed on the engine base 200 to realize the installation of the oil receiver structure applicable to low head and large flow rate.

[0034] The oil receiver structure 100 applicable to low head and large flow rate in the preferred embodiment of the present utility model includes an oil receiver base 110, a fixed sleeve 120 and a rotating body 130.

[0035] The oil receiver base 110 is used to be fixed on the engine base 200 in the Kaplan turbine. In the Kaplan turbine, the oil receiver base 110 is fixed on the engine base 200 to realize the installation of the oil receiver structure 100 applicable to low head and large flow rate.

[0036] Please refer to Figure 3 together, the fixed sleeve 120 is a hollow structure with an installation port 121 at one end. The fixed sleeve 120 is fixed on the oil receiver base 110. The side wall of the fixed sleeve 120 is provided with a first oil port 122 and a second oil port 123. Specifically, the oil receiver mechanism applicable to low head and large flow rate further includes a first high-pressure oil pipe 140 and a second high-pressure oil pipe 150, and one ends of the first high-pressure oil pipe 140 and the second high-pressure oil pipe 150 are respectively communicated with the first oil port 122 and the second oil port 123.

[0037] Please refer to Figure 4 together, the rotating body 130 has independent first oil channels 131 and second oil channels 132. One end of the rotating body 130 is rotatably inserted into the fixed sleeve 120 and is in sliding contact with the inner wall of the fixed sleeve 120, and the first oil channels 131 and the second oil channels 132 are respectively in sealed communication with the first oil port 122 and the second oil port 123. The other end of the rotating body 130 extends out of the installation port 121, and one ends of the first oil channels 131 far from the first oil port 122 and the second oil channels 132 far from the second oil port 123 are both located outside the fixed sleeve 120.

[0038] The above-mentioned oil receiver structure 100 applicable to low head and large flow rate, on the one hand, compared with the oil receiver structure in the prior art that requires three floating shoes to be set and two high-pressure oil chambers to be formed, the rotating body 130 is rotatably inserted into the fixed sleeve 120 to form an integral body, and the outer wall of the rotating body 130 is in direct contact with the inner wall of the fixed sleeve 120, so there is no need to set floating shoes. The first oil port 122 is directly connected to the first oil passage 131, and the second oil port 123 is directly connected to the second oil passage 132, without the need to set two high-pressure oil chambers. The above-mentioned oil receiver structure 100 applicable to low head and large flow rate has the advantages of simple structure, light weight and small volume, and ensures greater overall rigid strength and better durability. On the other hand, compared with the oil receiver structure in the prior art that has three oil circuits including an opening oil circuit, a closing oil circuit and a pressure maintaining oil circuit, the first oil port 122 is communicated with the first oil passage 131 to form a high-pressure operation oil circuit, and the second oil port 123 is communicated with the second oil passage 132 to form another high-pressure operation oil circuit, canceling the pressure maintaining oil circuit, which is beneficial to further reducing the volume. It not only makes the runner body cavity cleaner, but also reduces the risk of oil leakage.

[0039] It should be noted that since the above-mentioned Kaplan turbine is applied to the hydraulic resources of low head and large flow rate, the water pressure outside the runner is not high. Therefore, there is no pressure maintaining oil circuit in the above-mentioned oil receiver structure 100 applicable to low head and large flow rate, and the pressure difference between the inside and outside of the runner is very small.

[0040] Please refer to again Figure 3 , in some embodiments, the fixed sleeve 120 includes a sleeve body 124 having a hollow cylindrical structure with openings at both ends, a thrust plate 125 and an end plate 126. The thrust plate 125 and the end plate 126 are respectively detachably installed at both ends of the sleeve body 124. An installation port 121 coaxially arranged with the sleeve body 124 is formed on the end plate 126.

[0041] Please refer to again Figure 4 , the rotating body 130 includes a first rotating section 133 and a second rotating section 134 connected in sequence. The diameter of the first rotating section 133 is larger than that of the second rotating section 134. The first rotating section 133 is rotatably inserted into the sleeve body 124. The second rotating section 134 is rotatably inserted into the installation port 121, and the inner wall of the end plate 126 abuts against the axial end face of the first rotating section 133.

[0042] In this way, the fixed sleeve 120 is set as the sleeve body 124, the thrust plate 125 and the end plate 126 to facilitate the installation of the rotating body 130 in the fixed sleeve 120, and through the end plate 126 and the thrust plate 125, it can be ensured that the first rotating section 133 can be accurately installed in the sleeve body 124, limiting the axial installation position of the rotating body 130, which is beneficial to improving the installation accuracy and further reducing the risk of oil leakage.

[0043] Further, in some embodiments, the oil receiver structure 100 applicable to low head and large flow rate further includes a first seal 160. The first seal 160 is arranged along the circumferential direction of the sleeve body 124 and is clamped between the thrust plate 125 and the end face of one end of the sleeve body 124. In this way, the first seal 160 can seal the connection between the thrust plate 125 and the sleeve body 124, reducing the probability of oil leakage from the connection between the thrust plate 125 and the sleeve body 124.

[0044] To ensure the stable reliability of the first seal 160, specifically, a first sealing groove is formed along the circumferential direction of the sleeve body 124 on the side of the thrust plate 125 facing the sleeve body 124. The first seal 160 is installed in the first sealing groove and abuts against the end face of the sleeve body 124 away from the end plate 126.

[0045] Of course, in other embodiments, the first seal 160 can be directly clamped between the side surface of the thrust plate 125 and the end face of the sleeve body 124, or a first sealing groove (not marked in the figure) can be formed on the end face of the sleeve body 124 to install the first seal 160 on the end face of the sleeve body 124.

[0046] Furthermore, in some embodiments, an oil accumulation cavity 127 is formed between the thrust plate 125 and the end face of the first rotating section 133 away from the second rotating section 134. A drain hole (not shown in the figure) communicating with the oil accumulation cavity 127 is formed on the thrust plate 125. A drain pipe 170 is installed on the drain hole.

[0047] Among them, the forms of obtaining the oil accumulation cavity 127 are divided into the following situations: one is that a first groove is formed on the side of the thrust plate 125 facing the end plate 126, and the oil accumulation cavity 127 is surrounded by the inner wall of the first groove and the end face of the first rotating section 133 away from the end plate 126; the second is that a second groove is formed on the end face of the first rotating section 133 away from the end plate 126, and the oil accumulation cavity 127 is surrounded by the inner wall of the second groove and the surface of the thrust plate 125 facing the end plate 126; the third is that a first groove is formed on the end face of the first rotating section 133 away from the end plate 126, and a second groove of the oil passage is formed on the surface of the thrust plate 125 facing the end plate 126, and the oil accumulation cavity 127 is surrounded by the inner walls of the first groove and the second groove.

[0048] In this way, in practical applications, even if oil leakage occurs between the outer wall of the first rotating section 133 and the inner wall of the fixed sleeve 120 due to reasons such as rotation and wear, this part of the oil can flow along the outer surface of the first rotating section 133 into the oil accumulation cavity 127, and after being collected in the oil accumulation cavity 127, it can be led out through the drain hole and the drain pipe 170, further reducing the probability of environmental pollution caused by oil leakage.

[0049] In some embodiments, an independent first annular cavity 135 and a second annular cavity 136 are formed between the outer wall of the rotating body 130 and the inner wall of the fixed sleeve 120. The first annular cavity 135 and the second annular cavity 136 are both arranged along the circumferential direction of the rotating body 130. One end openings of the first oil port 122 and the first oil passage 131 communicate with the first annular cavity 135. The second oil port 123 and the second oil passage 132 both communicate with the second annular cavity 136. Specifically, the first annular cavity 135 and the second annular cavity 136 are arranged at intervals along the central axis direction of the rotating body 130.

[0050] Among them, the formation method of the first annular cavity 135 is divided into the following several cases: First, a first annular groove is formed along the circumferential direction on the inner wall of the fixed sleeve 120, and the first annular cavity 135 is formed between the inner wall of the first annular groove and the outer wall of the rotating body 130. At this time, the first oil port 122 is located in the first annular groove, and one end opening of the first oil passage 131 is aligned with the first annular groove; Second, a second annular groove is formed along the circumferential direction on the outer wall of the rotating body 130, and the first annular cavity 135 is formed between the inner wall of the second annular groove and the inner wall of the rotating body 130. At this time, one end opening of the first oil passage 131 is located in the second annular groove, and the first oil port 122 is aligned with the first annular groove; Third, annular grooves are formed along the circumferential direction on both the inner wall of the fixed sleeve 120 and the outer wall of the rotating body 130. The two annular grooves are aligned and their inner walls enclose the first annular cavity 135. At this time, the opening of the first oil passage 131 and the first oil port 122 are respectively located in the two annular grooves. Similarly, the formation method of the second annular cavity 136 refers to the formation method of the first annular cavity 135 above and will not be elaborated here.

[0051] In this way, during the operation of the unit, the rotating body 130 rotates relative to the fixed sleeve 120. At this time, the first annular cavity 135 can ensure that the high-pressure oil in the first oil port 122 can smoothly enter the first oil passage 131, and the second annular cavity 136 can ensure that the high-pressure oil in the second oil port 123 can smoothly enter the second oil passage 132. While ensuring the smooth oil supply to the runner body structure, the probability of oil leakage can be further reduced.

[0052] Please refer to Figure 5, in some embodiments, the oil receiver base 110 has a rotating mounting portion 111 and a fixed mounting portion 112. The fixed mounting portion 112 is fixedly connected to the fixed sleeve 120. The oil receiver structure 100 applicable to low head and large flow rate further includes a connecting body 180. The connecting body 180 is rotatably mounted on the rotating mounting portion 111, and one end thereof is fixedly connected to the end of the rotating body 130 outside the fixed sleeve 120. The connecting body 180 has mutually independent first operating oil passages 181 and second operating oil passages 182 therein. One ends of the first operating oil passages 181 and the second operating oil passages 182 are respectively communicated with the ends of the first oil passage 131 away from the first oil port 122 and the ends of the second oil passage 132 away from the second oil port 123. In a Kaplan turbine, the end of the connecting body 180 away from the rotating body 130 is connected to the main shaft.

[0053] The fixed sleeve 120 and the connecting body 180 are respectively mounted on the oil receiver base 110 through the rotating mounting portion 111 and the fixed mounting portion 112 to realize the support of the fixed sleeve 120 and the connecting body 180, so as to improve the structural stability and operation stability of the oil receiver structure 100 applicable to low head and large flow rate.

[0054] Furthermore, in some embodiments, second seals 191 and third seals 192 are provided at the connection between the rotating body 130 and the connecting body 180. The second seals 191 are arranged along the circumferential direction of the rotating body 130, and the openings of the first oil passage 131 away from the first oil port 122 and the openings of the second oil passage 132 away from the second oil port 123 are both located inside the second seals 191. The third seals 192 are arranged along the circumferential direction of the opening of the second oil passage 132 away from the second oil port 123, and the openings of the first oil passage 131 away from the first oil port 122 are located outside the third seals 192, and the openings of the second oil passage 132 away from the second oil port 123 are located inside the third seals 192.

[0055] In this way, the setting of the second seals 191 is to improve the sealing performance at the connection between the rotating body 130 and the connecting body 180, so as to reduce the probability of oil leakage from the connections between the first oil passage 131 and the first operating oil passages 181 and between the second oil passage 132 and the second operating oil passages 182 to the outside. The setting of the third seals 192 can prevent the occurrence of oil cross-leakage between the connection between the first oil passage 131 and the first operating oil passages 181 and the connection between the second oil passage 132 and the second operating oil passages 182, so as to further enhance the stability of the speed regulation system, adjust the blade opening timely and effectively, and ensure the safe operation of the unit.

[0056] Specifically, on one end face of the rotating body 130 facing the connecting body 180, a first sealing groove and a second sealing groove are circumferentially formed. The second sealing groove is located within the first sealing groove. The opening of the end of the second oil passage 132 away from the second oil port 123 is located within the second sealing groove, and the opening of the end of the first oil passage 131 away from the first oil port 122 is located between the first sealing groove and the second sealing groove. The second seal 191 and the third seal 192 are respectively installed within the first sealing groove and the second sealing groove. Of course, in other embodiments, the first sealing groove and the second sealing groove may also be provided on the end face of the connecting body 180 facing the fixed sleeve 120.

[0057] Further, in some embodiments, the connecting body 180 is rotatably installed within the rotating installation portion 111 through a bushing 201. The provision of the bushing 201 ensures that the rotation of the connecting body 180 on the oil receiver base 110 is smoother, thereby ensuring that the rotation of the rotating body 130 within the fixed sleeve 120 is also smoother, to further ensure the more stable operation of the oil receiver structure 100 applicable to low head and large flow rate.

[0058] Further, in some embodiments, the oil receiver base 110 includes an annular fixing frame 113, a rotating seat 114, and a fixed seat 115. The outer side of the annular fixing frame 113 is used to connect with the engine base 200. The fixed seat 115 and the rotating seat 114 are respectively detachably installed at both ends inside the annular fixing frame 113. The fixed seat 115 forms a fixed installation portion 112 along the circumference of the fixed sleeve 120. The rotating seat 114 forms a rotating installation portion 111 along the circumference of the connecting body 180.

[0059] In this way, the oil receiver base 110 is divided into three parts, namely the annular fixing frame 113, the rotating seat 114, and the fixed seat 115, and separately formed to improve the processing accuracy of the oil receiver base 110 and reduce material waste.

[0060] Even further, in some embodiments, the fixed seat 115 includes an annular plate 1151 arranged along the circumference of the fixed sleeve 120 and a thin plate connecting member 1152 fixed to the inner wall of the annular plate 1151. One end of the annular plate 1151 away from the thin plate connecting member 1152 is detachably connected to the annular fixing frame 113. The thin plate connecting member 1152 is detachably connected to one end of the fixed sleeve 120 provided with the installation port 121. The fixed sleeve 120 and the annular plate 1151 are arranged in a staggered manner in a direction perpendicular to the central axis direction of the fixed sleeve 120. Specifically, the thin plate connecting member 1152 can elastically deform in a direction perpendicular to the central axis direction of the fixed seat 115.

[0061] Among them, the thin plate connecting member 1152 can be a thin cylindrical structure arranged along the circumferential direction of the fixed sleeve 120, or can be a plurality of thin plate strips arranged at intervals along the circumferential direction of the fixed sleeve 120. In this way, the thin plate connecting member 1152 forms a fixed installation portion 112 in the circumferential direction of the fixed sleeve 120, and the fixed seat 115 is set as the annular plate 1151 and the thin plate connecting member 1152. While ensuring the stable installation of the fixed sleeve 120, the thin plate connecting member 1152 can also absorb the vibration transmitted by the generator unit during the operation of the unit to further ensure the stable and reliable operation of the above-mentioned Kaplan turbine.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0063] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An oil receiver structure applicable to low head and large flow rate, characterized in that, Comprising: An oil receiver base for fixing on the seat of the engine in a Kaplan turbine; A fixed sleeve, which is a hollow structure with an installation port at one end; the fixed sleeve is fixed on the oil receiver base; the side wall of the fixed sleeve is provided with a first oil port and a second oil port; A rotating body having independent first and second oil channels; one end of the rotating body is rotatably inserted into the fixed sleeve and is in sliding contact with the inner wall of the fixed sleeve, and the first oil channel and the second oil channel are respectively in sealed communication with the first oil port and the second oil port; the other end of the rotating body extends out of the installation port, and one end of the first oil channel far from the first oil port and one end of the second oil channel far from the second oil port are both located outside the fixed sleeve.

2. The oil receiver structure applicable to low head and large flow rate according to claim 1, characterized in that, The fixed sleeve includes a sleeve body having a hollow cylindrical structure with both ends open, a thrust plate and an end plate; the thrust plate and the end plate are respectively detachably fixed to both ends of the sleeve body; the installation port coaxially arranged with the sleeve body is formed on the end plate; The rotating body includes a first rotating section and a second rotating section connected in sequence; the diameter of the first rotating section is larger than that of the second rotating section; the first rotating section is rotatably inserted into the sleeve body; the second rotating section is rotatably inserted into the installation port, and the inner wall of the end plate abuts against the axial end face of the first rotating section.

3. The oil receiver structure applicable to low head and large flow rate according to claim 2, characterized in that It further includes a first seal; the first seal is arranged circumferentially along the sleeve body and is clamped between the thrust plate and the end face of one end of the sleeve body.

4. The oil receiver structure applicable to low head and large flow rate according to claim 3, characterized in that, An oil accumulation cavity is formed between the thrust plate and the end face of one end of the first rotating section far from the second rotating section; an oil drain hole communicating with the oil accumulation cavity is opened on the thrust plate; an oil drain pipe is installed on the oil drain hole.

5. The oil receiver structure applicable to low head and large flow rate according to claim 1, characterized in that, Independent first and second annular cavities are formed between the outer wall of the rotating body and the inner wall of the fixed sleeve; both the first annular cavity and the second annular cavity are arranged circumferentially along the rotating body; the first oil port and one end opening of the first oil channel are both in communication with the first annular cavity; the second oil port and the second oil channel are both in communication with the second annular cavity.

6. The oil receiver structure applicable to low head and large flow rate according to claim 1, characterized in that, The oil receiver base has a rotating installation part and a fixed installation part; the fixed installation part is fixedly connected with the fixed sleeve; The oil receiver structure applicable to low head and large flow rate further includes a connecting body; the connecting body is rotatably installed on the rotating installation part, and one end is fixedly connected with the end of the rotating body located outside the fixed sleeve; the connecting body has independent first and second operating oil channels; one ends of the first operating oil channel and the second operating oil channel are respectively in communication with one end of the first oil channel far from the first oil port and one end of the second oil channel far from the second oil port.

7. The oil receiver structure applicable to low head and large flow rate according to claim 6, characterized in that, A second seal and a third seal are provided at the connection between the rotating body and the connecting body; the second seal is arranged along the circumferential direction of the rotating body, and the openings at the ends of the first oil passage away from the first oil port and the openings at the ends of the second oil passage away from the second oil port are both located inside the second seal; the third seal is arranged along the circumferential direction of the opening at the end of the second oil passage away from the second oil port, and the opening at the end of the first oil passage away from the first oil port is located outside the third seal, and the opening at the end of the second oil passage away from the second oil port is located inside the third seal; and / or The connecting body is rotatably mounted in the rotating mounting portion through a bushing.

8. The oil receiver structure applicable to low head and large flow rate according to claim 6, characterized in that, The oil receiver base includes an annular fixing frame, a rotating seat and a fixed seat; the outer side of the annular fixing frame is used for connecting with the engine base; the fixed seat and the rotating seat are respectively detachably mounted at both ends inside the annular fixing frame; the fixed seat forms the fixed mounting portion along the circumferential direction of the fixed sleeve; the rotating seat forms the rotating mounting portion along the circumferential direction of the connecting body.

9. The oil receiver structure applicable to low head and large flow rate according to claim 8, characterized in that, The fixed seat includes a ring plate arranged along the circumferential direction of the fixed sleeve and a thin plate connecting member fixed on the inner wall of the ring plate; one end of the ring plate away from the thin plate connecting member is detachably connected with the annular fixing frame; the thin plate connecting member is detachably connected with one end of the fixed sleeve provided with the mounting port; the fixed sleeve and the ring plate are arranged in a staggered manner in a direction perpendicular to the central axis direction of the fixed sleeve.

10. An axial flow Kaplan turbine, characterized in that, It includes an end face oil receiver structure and an engine applicable to low head and large flow rate according to any one of claims 1 to 9; the fixed sleeve is fixed on the engine base.

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