Test tool for axial-flow Kaplan turbine

Abstract

The utility model relates to a testing tool for an axial-flow Kaplan turbine in the technical field of turbine testing. The device comprises a shell, a paddle opening pipe, a paddle closing pipe and a pressure maintaining oil passing pipe, the shell is installed at the top of a runner hub through a bolt, a spacer bush is arranged in the shell, a cavity opening channel is formed between the spacer bush and the shell, and a cavity closing channel is formed in the spacer bush; the shell is provided with a paddle opening pipe communicated with the cavity opening channel and a paddle closing pipe communicated with the cavity closing channel; the oil outlet end of the pressure-maintaining oil passing pipe extends into the spacer bush in the shell and is communicated with a test pipe of the runner hub; the tool has the advantages of being convenient to operate, not prone to leakage and accurate in test structure.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine testing, in particular to a testing tool for an axial flow propeller type water turbine. Background Art

[0002] The axial-flow propeller turbine relies on the hydraulic control system to simultaneously adjust the turbine blade angle and guide vane opening, which can more fully utilize the energy of the water flow and has a wider range of high efficiency area; and the runner part of the axial-flow propeller turbine must be subjected to blade action test and blade sealing test after disassembly and assembly, so as to ensure that the blade movement is flexible and the various parts of the runner body are well sealed after the unit is put into operation.

[0003] Among them, the inner part of the runner of the axial-flow propeller turbine is divided into three cavities, namely the relay open cavity, the relay closed cavity and the runner inner cavity, and the complete test process is: when there is no oil pressure in the runner inner cavity, firstly, oil is injected into the relay open cavity to increase the pressure to open the blade, and then oil is injected into the servomotor closed cavity to increase the pressure to close the blade, and this reciprocating process is the blade action test; when the blade action test meets the requirements, the blade sealing test is immediately carried out, that is, oil is injected into the runner inner cavity to increase the pressure, and then the pressure is maintained to test the sealing effect of the blade seal. While doing the blade sealing test, it is also necessary to synchronously carry out the blade full-stroke switch action test;

[0004] The conventional rotor body test tool consists of an outer shell, an inner cover and two oil filling pipes, wherein the outer shell is mounted on the top of the rotor body by bolts, and the inner cover is sealed with the test pipe of the rotor body inside the outer shell. Then, oil is injected into the rotor body through the two oil filling pipes to increase the pressure, and the oil enters the relay opening chamber and the relay closing chamber of the rotor body to control the opening and closing of the blades and perform the blade action test. When the blade action test meets the requirements, oil is injected into the inner cavity of the rotor body through the test pipe from the oil discharge port at the bottom of the rotor body to increase the pressure. After the oil is injected, the oil discharge port is closed to maintain the pressure, thereby achieving a sealing and pressure-maintaining test of the inner cavity of the rotor body. At the same time, oil is injected into the rotor body again through the two oil filling pipes to increase the pressure and perform the blade action test. However, when using this tool for testing, it is necessary to repeatedly disassemble and assemble the outer shell and the inner cover.

[0005] However, traditional testing tools have the following disadvantages:

[0006] (1) Filling oil from the oil outlet at the bottom of the runner body can easily cause pipeline pressure buildup and slow oil filling speed;

[0007] (2) During the oil filling process of the pressure holding test, the joint between the oil filling pipeline and the oil discharge port is prone to loosening due to pressure buildup, causing oil leakage and environmental pollution accidents;

[0008] (3) When installing traditional test tools and filling oil from the oil drain port, the process is more complicated and delays the construction period;

[0009] (4) During the pressure holding test, after filling the oil from the oil drain port, it is necessary to pressurize the inner cavity from the exhaust port of the runner body. However, this operation is relatively cumbersome and can easily cause oil leakage from the joint at the oil drain port, affecting the accuracy of the test results.

[0010] Therefore, we propose a test tool that is easy to operate, not prone to leakage, and has an accurate test structure. Utility Model Content

[0011] In order to overcome the deficiencies in the background technology, the utility model discloses a test tool for an axial-flow propeller-type water turbine.

[0012] In order to achieve the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

[0013] A test tool for an axial-flow propeller turbine comprises a housing, a blade opening pipe, a blade closing pipe, and a pressure-maintaining oil pipe. The housing is mounted on top of a runner body by bolts. A spacer is provided inside the housing. An open cavity channel is provided between the spacer and the housing, and a closed cavity channel is provided inside the spacer.

[0014] The shell is provided with a blade opening tube connected to the opening cavity channel, and a blade closing tube connected to the closing cavity channel; the oil outlet end of the pressure-maintaining oil pipe extends into the spacer sleeve in the shell and is connected to the test tube of the runner body.

[0015] Preferably, the blade opening pipe is provided with a hydraulic sensor.

[0016] Preferably, the blade closing tube is provided with a hydraulic sensor.

[0017] Preferably, the pressure-maintaining oil pipe is provided with a hydraulic sensor.

[0018] Preferably, the blade opening tube, the blade closing tube and the pressure-maintaining oil pipe are all connected to the oil supply mechanism; the oil supply mechanism provides pressurized oil to the corresponding chambers in the impeller body through corresponding pipelines.

[0019] Preferably, the oil supply mechanism includes an oil storage tank, a boost oil pump and a two-position three-way solenoid valve, wherein the oil storage tank is provided with three oil outlets, each of which is connected to a boost oil pump, wherein the oil outlet of one boost oil pump is connected to the pressure-maintaining oil pipe, and the other two boost oil pumps are respectively connected to one end of a two-position three-way solenoid valve, the second ends of the two two-position three-way solenoid valves are respectively connected to the blade opening pipe and the blade closing pipe, and the third ends of the two two-position three-way solenoid valves are both connected to the oil return port of the oil storage tank.

[0020] Preferably, a check valve is provided between the boost oil pump and the pressure-maintaining oil pipe.

[0021] Preferably, the pressure-maintaining oil pipe is configured as a retractable high-pressure hose.

[0022] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0023] The utility model discloses a test tool for an axial flow propeller type water turbine.

[0024] 1. First, the pressure-maintaining oil pipe can be used to directly inject oil into the test tube and inner cavity of the runner body to increase the pressure, eliminating the tedious operation of disassembling and assembling the traditional inner cover, and simplifying the installation and operation process of this test tool;

[0025] 2. Secondly, since the pressure-maintaining oil pipe can directly inlet oil from the test pipe on the top of the runner body, it avoids the pipeline pressure buildup phenomenon caused by filling oil from the oil outlet at the bottom of the runner body. In addition, the pressure-maintaining oil pipe will not leak oil due to pressure increase, making it difficult for the connection between the pressure-maintaining oil pipe and the test pipe to leak oil, thereby improving the safety of the test tool and the accuracy of the test results.

[0026] 3. Finally, the booster oil pump in the oil supply mechanism can directly output pressurized oil to the runner body, eliminating the need to pressurize the inner cavity of the runner body, further simplifying the test process and effectively avoiding oil leakage at the connection between the pressure-maintaining oil pipe and the runner body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A structural diagram of the utility model;

[0028] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0029] Figure 3 Schematic diagram of the specific structure of the shell;

[0030] Figure 4 It is a structural diagram of the oil supply mechanism.

[0031] In the figure: 1. Shell; 2. Spacer; 21. Open cavity channel; 22. Close cavity channel; 3. Blade opening tube; 4. Blade closing tube; 5. Pressure maintaining oil pipe; 6. Hydraulic sensor; 7. Oil supply mechanism; 71. Oil storage tank; 72. Booster oil pump; 73. Two-position three-way solenoid valve; 8. Check valve; 9. Rotor body; 91. Relay open cavity; 92. Relay closing cavity; 93. Inner cavity; 10. Test tube. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described below with reference to the accompanying drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, these are merely corresponding to the drawings of the present invention and are for the convenience of describing the present invention. They do not indicate or imply that the devices or components referred to must have a specific direction.

[0033] Example 1 is:

[0034] Combined with attachment Figure 1-3 The test tool for an axial-flow propeller turbine comprises a housing 1, a blade opening pipe 3, a blade closing pipe 4, and a pressure-maintaining oil pipe 5. The housing 1 is mounted on the top of the runner body 9 by bolts. A spacer 2 is provided inside the housing 1. An open cavity channel 21 is provided between the spacer 2 and the housing 1, and a closed cavity channel 22 is provided inside the spacer 2.

[0035] It should be noted that the spacer 2 is a cylindrical structure like the housing 1, and the two are coaxially arranged. The top of the spacer 2 conflicts with the top surface of the housing 1, and the bottom of the spacer 2 conflicts with the top surface of the rotor body 9, that is, the open cavity channel 21 and the closed cavity channel 22 are not connected to each other.

[0036] The housing 1 is provided with a blade opening pipe 3 communicating with the opening channel 21, and a blade closing pipe 4 communicating with the closing channel 22. The oil outlet end of the pressure-maintaining oil pipe 5 extends into the spacer 2 in the housing 1 and communicates with the test pipe 10 of the rotor body 9.

[0037] The opening cavity channel 21 is connected to the servomotor opening cavity 91 in the runner body 9, and the closing cavity channel 22 is connected to the servomotor closing cavity 92 in the runner body 9. When performing a blade opening and closing test, first, the blade opening pipe 3 injects oil into the servomotor opening cavity 91 to increase the pressure. At this time, there is no oil in the servomotor closing cavity 92, and the blades of the runner body 9 will open. Then, the blade closing pipe 4 injects oil into the servomotor closing cavity 92 to increase the pressure, and the servomotor opening cavity 91 returns oil to the blade opening pipe 3. At this time, the blades of the runner body 9 will close. Finally, the above steps are repeated to complete the blade opening and closing test.

[0038] In addition, when conducting a blade sealing test, oil is injected into the test tube 10 and the inner cavity 93 of the rotor body 9 through the pressure-maintaining oil pipe 5 to increase pressure. At this time, the pressure-maintaining oil pipe 5, the test tube 10 and the inner cavity 93 of the rotor body 9 are integrated. When the pressure is sufficient, the inlet of the pressure-maintaining oil pipe 5 is closed to complete the sealing test.

[0039] In addition, through this test tool, the blade sealing test can be carried out during the blade switch test, and vice versa. Therefore, the testing of the blades of the rotor body 9 is smoother and more convenient, thereby shortening the test period.

[0040] Example 2 is:

[0041] On the basis of Example 1, a hydraulic sensor 6 is provided on any one of the blade opening tube 3, the blade closing tube 4 and the pressure-maintaining oil pipe 5, which can detect the pressure of the oil in the corresponding pipe, thereby judging whether the current test process is smooth. If the test process is not smooth, the test is stopped in time to prevent damage to the runner body 9, and according to the change of the oil pressure, it can also be judged whether the pipeline is leaking or blocked. In addition, hydraulic sensors 6 can also be provided on the blade opening tube 3, the blade closing tube 4 and the pressure-maintaining oil pipe 5.

[0042] Example 3 is:

[0043] On the basis of Example 1, combined with the attached Figure 4 , so that the blade opening pipe 3, the blade closing pipe 4 and the pressure-maintaining oil pipe 5 are all connected to the oil supply mechanism 7; the oil supply mechanism 7 supplies pressurized oil to the corresponding chambers in the runner body 9 through corresponding pipes;

[0044] In addition, the oil supply mechanism 7 includes an oil storage tank 71, a boosting oil pump 72, an oil delivery pipe and a two-position three-way solenoid valve 73, wherein the oil storage tank 71 is provided with three oil outlets, each of which is connected to a boosting oil pump 72, wherein the oil outlet of one boosting oil pump 72 is connected to the pressure-maintaining oil pipe 5, and the other two boosting oil pumps 72 are respectively connected to one end of a two-position three-way solenoid valve 73, the second ends of the two two-position three-way solenoid valves 73 are respectively connected to the blade opening pipe 3 and the blade closing pipe 4, and the third ends of the two two-position three-way solenoid valves 73 are both connected to the oil return port of the oil storage tank 71;

[0045] The booster oil pump 72 can provide pressurized oil to the pipeline, thereby eliminating the operation of pressurizing the oil in the inner cavity 93 of the impeller body 9, simplifying the operating steps of the blade switch test and the sealing test. In addition, since the pressurized oil after the oil return cannot flow back to the oil storage tank 71 through the booster oil pump 72, the oil pressure and oil return processes of the blade opening pipe 3 and the blade closing pipe 4 are separated by the two-position three-way solenoid valve 73, making the blade switch test process smoother.

[0046] Example 4 is:

[0047] On the basis of Example 3, a check valve 8 is provided between the boost oil pump 72 and the pressure maintaining oil pipe 5, which can prevent the pressurized oil in the test pipe 10 of the runner body 9 from flowing back into the boost oil pump 72, thereby protecting the boost oil pump 72.

[0048] Example 5 is:

[0049] On the basis of Example 1, the pressure-maintaining oil pipe 5 is configured as a retractable high-pressure hose. The use of the hose can make the connection between the pressure-maintaining oil pipe 5 and the test pipe 10 of the rotor body 9 more convenient, and the two can be connected by a tightening mechanism. In addition, the use of a retractable and high-pressure resistant structure can also allow the pressure-maintaining oil pipe 5 to have better load-bearing capacity and buffering effect when the pressure oil passes through, preventing the pressure oil from collapsing the connection between the pressure-maintaining oil pipe 5 and the test pipe 10, and when the pressure oil stays in the pressure-maintaining oil pipe during the pressure-maintaining process, the pressure-maintaining oil pipe 5 has a higher load-bearing capacity and will not cause damage to the pipe body.

[0050] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A test tool for an axial-flow propeller turbine, characterized in that: The invention comprises a housing (1), a blade opening tube (3), a blade closing tube (4) and a pressure-maintaining oil pipe (5); the housing (1) is mounted on the top of a rotor body (9) by means of bolts; a spacer (2) is arranged inside the housing (1); an opening channel (21) is arranged between the spacer (2) and the housing (1); and a closing channel (22) is arranged inside the spacer (2); The housing (1) is provided with a blade opening tube (3) communicating with the opening cavity channel (21), and a blade closing tube (4) communicating with the closing cavity channel (22); the oil outlet end of the pressure-maintaining oil pipe (5) extends into the spacer (2) in the housing (1) and is communicated with the test tube (10) of the impeller body (9).

2. The test tool for an axial-flow propeller turbine according to claim 1, characterized in that: The blade opening pipe (3) is provided with a hydraulic pressure sensor (6).

3. The test tool for an axial-flow propeller turbine according to claim 1, characterized in that: The blade closing pipe (4) is provided with a hydraulic pressure sensor (6).

4. The test tool for an axial-flow propeller turbine according to claim 1, characterized in that: The pressure-maintaining oil pipe (5) is provided with a hydraulic pressure sensor (6).

5. The test tool for an axial-flow propeller turbine according to claim 1, characterized in that: The blade opening pipe (3), the blade closing pipe (4) and the pressure-maintaining oil pipe (5) are all connected to an oil supply mechanism (7); the oil supply mechanism (7) supplies pressurized oil to corresponding chambers in the impeller body (9) through corresponding pipelines.

6. The test tool for an axial-flow propeller turbine according to claim 5, characterized in that: The oil supply mechanism (7) comprises an oil storage tank (71), a boosting oil pump (72) and a two-position three-way solenoid valve (73), wherein the oil storage tank (71) is provided with three oil outlets, each of which is connected to a boosting oil pump (72), wherein the oil outlet of one boosting oil pump (72) is connected to a pressure-maintaining oil pipe (5), and the other two boosting oil pumps (72) are respectively connected to one end of a two-position three-way solenoid valve (73), the second ends of the two two-position three-way solenoid valves (73) are respectively connected to a blade opening pipe (3) and a blade closing pipe (4), and the third ends of the two two-position three-way solenoid valves (73) are both connected to the oil return port of the oil storage tank (71).

7. The test tool for an axial-flow propeller turbine according to claim 6, characterized in that: A check valve (8) is provided between the boosting oil pump (72) and the pressure-maintaining oil pipe (5).

8. The test tool for an axial-flow propeller turbine according to claim 1, characterized in that: The pressure-maintaining oil pipe (5) is configured as a retractable high-pressure hose.

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