Water-turbine generator set large shaft gulp valve monitoring device

Abstract

The invention provides a water-turbine generator set large shaft gulp valve monitoring device, and belongs to the technical field of water-turbine power generation gulp valves, the water-turbine generator set large shaft gulp valve monitoring device comprises a valve cylinder, the bottom of the valve cylinder is fixedly connected with a valve seat, and a valve disc is movably installed below the valve seat; the sleeve is installed at the upper end of the valve cylinder through a bolt, the outer wall, located on the inner side of the sleeve, of the valve rod is sleeved with a limiting piece, a positioning shell is installed on the outer wall of the sleeve, a telescopic support is fixedly installed on the inner side of the positioning shell, and a damping wheel for conducting damping limiting on the limiting piece is arranged at the tail end of the telescopic support; and the hydraulic cavity is fixed to the outer wall of the positioning shell and communicates with the interior of the telescopic support, and a pressure gauge is further installed on the hydraulic cavity. According to the gulp valve, stable reset of the gulp valve in use can be achieved, meanwhile, vibration caused by loads and impact vibration in the reset process is reduced, then damage to the gulp valve caused by external force loads in use is effectively reduced, meanwhile, the gulp valve in the use process is monitored in real time, adjustment is convenient, and the use function is stable.

Description

Technical Field

[0001] The invention relates to the technical field related to a hydraulic turbine generator air supply valve, and in particular to a monitoring device for a main shaft air supply valve of a hydraulic turbine generator set. Background Art

[0002] The hydro-turbine generator set is a large-scale power supply equipment that uses the kinetic energy of water flow to convert mechanical energy into electrical energy. Through the continuous flow of water, under the action of height difference, the turbine structure rotates at high speed under the impact of water flow to achieve energy conversion. During the continuous operation of the turbine, in order to meet the stable operation requirements of the water turbine under load working conditions, a matching air supply system will be installed on the top of the main shaft of the hydro-turbine generator set to replenish the natural air from the outside world downwards; The air supply system is generally implemented with an air supply valve structure. When the generator set is operating normally, the air supply valve structure is in a good normally closed state. When the generator set is operating abnormally or continuously operating in a non-optimal solution, the vacuum degree of the tail water pipe in the air supply valve supporting facilities begins to increase. The pressure difference is used to make the valve disc structure of the air supply valve overcome the elastic force of the installed spring, and the natural air is supplied to the tail water pipe of the generator set to balance the pressure value. However, during this process, the valve disc structure uses the elasticity of the spring to naturally reset and close. When the pressure is balanced after the air supply operation, the valve disc structure will quickly reset. In a short period of time, the impulse and reset load of the valve disc and valve stem structure will suddenly increase, and the air supply valve will be closed by collision and closure. The external force impact in this process is large, which can easily cause deformation and shear deformation damage of the valve disc and valve stem structure. At the same time, it is not possible to monitor the structural stability of the air supply valve during continuous use. When the air supply valve is partially deformed and damaged due to external force and vibration, it cannot be effectively observed, affecting its sealing performance and the normal use function of the air supply valve. Summary of the invention

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a monitoring device for the main shaft air supply valve of a hydro-turbine generator set, so as to solve the problem that the existing main shaft air supply valve of a hydro-turbine generator set proposed in the above background technology has a large external force impact during use, which can easily cause deformation and shear deformation damage of the valve disc and valve stem structure, and at the same time, it is impossible to monitor the structural stability of the air supply valve during continuous use.

[0004] In order to realize the above technical features, the object of the present invention is achieved as follows: A monitoring device for a main shaft air supply valve of a hydro-generator set, comprising: A valve cylinder, the bottom of which is fixedly connected with a valve seat, a valve disc is movably installed below the valve seat, the top center of the valve disc is connected to the lower end of a valve stem movably installed inside the valve cylinder, a return spring is arranged on the outside of the valve stem, a guide rod is also fixedly installed on the valve seat, and the lower end of the guide rod is vertically fixedly connected to the outer wall of the top edge of the valve disc; and further comprising: A sleeve, a bolt of which is installed on the upper end of the valve cylinder, a limiting piece is sleeved on the outer wall of the valve stem located inside the sleeve, a positioning shell is installed on the outer wall of the sleeve, a telescopic bracket is fixedly installed inside the positioning shell, and a damping wheel for damping and limiting the limiting piece is provided at the end of the telescopic bracket; The hydraulic chamber is fixed to the outer wall of the positioning shell and communicates with the interior of the telescopic bracket, and a pressure gauge is also installed on the hydraulic chamber.

[0005] Preferably, the cross section of the limiting member is set to a regular hexagon, the corner points of the regular hexagon are set to a raised strip structure, and the side surface of the limiting member and the damping wheel are set in a one-to-one correspondence.

[0006] Preferably, the telescopic bracket is arranged in a broken line shape with an inner angle of 120°, the interior of the back side of the telescopic bracket and the interior of the hydraulic chamber are interconnected, and hydraulic oil is arranged in the interconnected interiors of the two.

[0007] Preferably, the positioning shell and the sleeve are a disassembly and installation structure connected by bolts, the positioning shell and the telescopic bracket correspond one to one, and a tough rod is fixed to the bottom of the inner wall of the positioning shell, and an elastic member is arranged between the tough rod and the telescopic bracket.

[0008] Preferably, the tough rod and the telescopic bracket are cross-distributed, and a gap is reserved at the intersection of the two.

[0009] Preferably, the hydraulic chamber monitors the oil pressure inside the telescopic bracket in real time through a pressure gauge thereon, and the hydraulic chamber is also equipped with a valve, which forms a threaded disassembly and installation structure with an external oil replenishing component through a connecting port thereon.

[0010] Preferably, permanent magnets are mounted on the top inner wall of the sleeve and the upper end of the valve stem via threads and bolts, and the magnetic settings of the opposite surfaces of the permanent magnet on the sleeve and the permanent magnet on the valve stem are different.

[0011] Preferably, the middle part of the valve stem and the sleeve is set as a through channel, an inner hollow rod is fixed in the through channel on the valve stem, and a photoelectric sensor is fixed on the top of the through channel of the sleeve, and a reflective component is also fixed at the inner center of the valve disc just below the valve stem.

[0012] Preferably, the inner hollow rod and the through hole on the valve stem are fixedly installed and positioned in a fitting manner, and the outer side of the inner hollow rod is made of ceramic silicone material and the inside is transparent.

[0013] Preferably, the length of the inner hollow rod is greater than the valve stem, and the inner hollow rod is vertically coaxially distributed with the photoelectric sensor and the reflective component.

[0014] The present invention has the following beneficial effects: 1. The main shaft air supply valve monitoring device of the hydro-turbine generator set of the present invention can realize the stable resetting of the air supply valve, and reduce the shock caused by the load and impact vibration during the resetting process, thereby effectively reducing the external force load damage of the air supply valve, and at the same time, the air supply valve during use is monitored in real time, which is convenient for adjustment and the stability of the use function.

[0015] 2. The present invention only needs to be installed by the combination of the limiting member and the damping wheel, and the relative rolling and damping friction between the two are used to achieve the deceleration effect during the valve stem reset movement. At the same time, the telescopic bracket and the damping wheel are used to perform auxiliary support positioning in the middle of the valve stem. When the valve stem vibrates due to impact and external force during use, the telescopic bracket and the damping wheel are used to support and buffer the valve stem in multiple directions to prevent the valve stem from being sheared and damaged laterally due to external force. 3. The present invention utilizes a damping wheel and a telescopic bracket to realize the support, positioning and protection of the valve stem. At the same time, the magnetic opposite attraction between the permanent magnets is set, so that the valve stem can stably and effectively expand and contract along its vertical center axis when it moves vertically, and it is not easy to have axial movement deviation, and at the same time, the valve stem deviation in normal use is reduced; 4. The present invention is provided with a hydraulic telescopic bracket and a damping wheel. While realizing the buffering and weakening of the lateral shear load when the valve stem moves axially, the hydraulic chamber and the pressure gauge thereon can be used to facilitate monitoring the direction to which the valve stem is concentratedly pressed during the movement, so as to observe the deformation and damage of the valve stem during long-term use. At the same time, the hydraulic chamber and the valve thereon can be used to adjust the internal hydraulic pressure of the telescopic bracket in different directions, so as to stabilize the local deformation state of the valve stem under the different hydraulic pressures of the telescopic bracket, so that the function of its use will not be affected when it is slightly deformed; 5. The present invention is provided with a matching inner hollow rod, a photoelectric sensor and a reflective component. By using the photoelectric sensor and the emission of light, the deformation state of the valve stem and the abnormal opening and closing degree of the valve disc under long-term use can be observed in real time. When the valve disc is partially tilted and deformed due to collision and external force impact, resulting in abnormal difference in the valve disc opening, abnormal monitoring and warning can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a schematic diagram of the front structure of the present invention.

[0018] Figure 2 It is a bottom view structural schematic diagram of the present invention.

[0019] Figure 3 It is a schematic diagram of the front cross-section structure of the present invention.

[0020] Figure 4 It is a schematic diagram of the front split structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the split structure from top view of the present invention.

[0022] Figure 6 It is a schematic diagram of the internal front structure of the sleeve of the present invention.

[0023] Figure 7 It is a schematic diagram of the back structure of the sleeve of the present invention.

[0024] Figure 8 This is a schematic diagram of the front structure of the telescopic bracket installed in the present invention.

[0025] Fig. 9 This is a schematic diagram of the side structure of the telescopic bracket installation of the present invention.

[0026] Fig.10 It is a schematic diagram of the hollow rod structure of the present invention.

[0027] In the figure: 1. valve cylinder; 2. valve seat; 3. valve disc; 4. valve stem; 5. return spring; 6. guide rod; 7. sleeve; 8. limiting member; 9. positioning shell; 901. tough rod; 10. telescopic bracket; 11. damping wheel; 12. hydraulic chamber; 13. pressure gauge; 14. valve; 15. permanent magnet; 16. inner hollow rod; 17. photoelectric sensor; 18. reflective component. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1: See also Figure 1-Figure 9The present invention provides a technical solution: a monitoring device for the main shaft air supply valve of a hydro-turbine generator set, comprising: a valve cylinder 1, a valve seat 2 is fixedly connected to the bottom of the valve cylinder 1, a valve disc 3 is movably installed under the valve seat 2, the top center of the valve disc 3 is connected to the lower end of a valve stem 4 movably installed inside the valve cylinder 1, and a reset spring 5 is arranged on the outer side of the valve stem 4, and the valve seat 2 is also fixedly installed with a guide rod 6, and the lower end of the guide rod 6 is vertically fixedly connected to the outer wall of the top edge of the valve disc 3; in the above technology, the position movement of the valve disc 3 is utilized to realize the air supply operation used by the generator set, and the installation of the reset spring 5 realizes the reset movement of the valve disc 3 and the valve stem 4, and the installation of the guide rod 6 makes the movement state of the valve disc 3 more stable during the lifting movement, and it is not easy to deviate laterally, which causes the stability performance of the valve disc 3 to be destroyed due to the lateral shear load during use.

[0030] Further, it also includes: a sleeve 7, which is bolted to the upper end of the valve cylinder 1, wherein the valve stem 4 is located on the outer wall of the inner side of the sleeve 7 and is sleeved with a limiting member 8, and a positioning shell 9 is installed on the outer wall of the sleeve 7, and a telescopic bracket 10 is fixedly installed inside the positioning shell 9, and a damping wheel 11 for damping and limiting the limiting member 8 is arranged at the end of the telescopic bracket 10; the cross section of the limiting member 8 is set to a regular hexagonal shape, and the corner points of the regular hexagonal shape are set to a raised strip structure, and the side of the limiting member 8 and the damping wheel 11 are arranged in a one-to-one corresponding fit; the telescopic bracket 10 is set to a broken line shape with an inner angle of 120°, and the inside of the back of the telescopic bracket 10 is mutually connected with the inside of the hydraulic chamber 12, and hydraulic oil is arranged in the two connected interiors; In the above technical solution, if Figure 3 , Figure 4 and Figure 6 As shown, since the damping wheel 11 is installed and positioned by the telescopic bracket 10, the outer wall of the damping wheel 11 is in contact with the outer wall of the limiting member 8. When the limiting member 8 moves up and down synchronously with the valve stem 4, the outer wall of the limiting member 8 and the damping wheel 11 roll and rub against each other. Under the action of the damping external force, the valve stem 4 and the limiting member 8 are buffered and decelerated during the reset movement, thereby avoiding the impact and vibration caused by the reset movement of the valve stem 4 under the action of the reset spring 5, which affects the stability of the structure of the valve stem 4 itself. At the same time, the telescopic bracket 10 is telescopically installed and has hydraulic oil inside. When the valve stem 4 and the limiting member 8 move to reset due to external force collision and vibration, and the valve stem 4 undergoes lateral shear movement, the telescopic bracket 10 achieves the effect of being stressed and unloading the external force through its own telescopic expansion and contraction and the change of the oil pressure, thereby preventing the valve stem 4 from being laterally broken due to the shear movement.

[0031] Furthermore, the positioning shell 9 and the sleeve 7 are a disassembly and installation structure connected by bolts. The positioning shell 9 and the telescopic bracket 10 correspond one to one, and a tough rod 901 is also fixed to the bottom of the inner wall of the positioning shell 9, and an elastic member is arranged between the tough rod 901 and the telescopic bracket 10; the tough rod 901 and the telescopic bracket 10 are cross-distributed, and a gap is reserved at the intersection of the two.

[0032] In the above technical solution, Figure 6-Figure 9 As shown, a matching and positioned tough rod 901 is provided, so that when the telescopic bracket 10 is subjected to a lateral extension and contraction by an external force impact, the tough rod 901 releases the kinetic energy of the external force load by utilizing the deformation of the elastic member and the toughness of the tough rod 901 during the telescopic movement of the telescopic bracket 10, and prevents the telescopic bracket 10 from deforming and breaking itself, thereby extending its service life and reducing the damage to the valve stem 4 caused by the reaction force during the force application of the telescopic bracket 10.

[0033] Also adopt Figure 1 In the technical solution shown, the hydraulic chamber 12 is fixed to the outer wall of the positioning housing 9 and is connected to the inside of the telescopic bracket 10, and a pressure gauge 13 is also installed on the hydraulic chamber 12; the hydraulic chamber 12 monitors the oil pressure inside the telescopic bracket 10 in real time through the pressure gauge 13 on it, and the hydraulic chamber 12 is also installed with a valve 14, and the valve 14 forms a threaded disassembly and installation structure with an external oil replenishing component through its upper connection port; In the above technical solution, a hydraulic chamber 12 structure is provided, and the internal oil pressure of the telescopic bracket 10 installed at the corresponding position is monitored in real time through the pressure gauge 13 on the hydraulic chamber 12, so as to facilitate observation of which specific part of the telescopic bracket 10 is subjected to long-term stress deformation, and the oil pressure inside the hydraulic chamber 12 is adjusted and changed by using the valve 14 structure, so that the movement state and stress state of the valve stem 4 can be detected during long-term use.

[0034] Embodiment 2: The present invention is based on embodiment 1, Figure 2-Figure 5 and Fig.10 As shown, the air supply valve monitoring device is further disclosed, which is specifically as follows: The middle part of the valve stem 4 and the sleeve 7 is set as a through channel, an inner hollow rod 16 is fixed in the through channel on the valve stem 4, and a photoelectric sensor 17 is fixed on the top of the through channel of the sleeve 7, and a reflective component 18 is also fixed at the inner center of the valve disc 3 just below the valve stem 4; the inner hollow rod 16 and the through channel on the valve stem 4 are fixedly installed and positioned in a fitting manner, and the outer side of the inner hollow rod 16 is made of ceramic silicone material and the inside is transparent; the length of the inner hollow rod 16 is greater than that of the valve stem 4, and the inner hollow rod 16, the photoelectric sensor 17 and the reflective component 18 are vertically coaxially distributed.

[0035] Furthermore, a matching inner hollow rod 16, a photoelectric sensor 17 and a reflective component 18 are provided. When the valve stem 4 and the valve disc 3 are in a good and stable state of normal use, the photoelectric sensor 17 reflects light at the reflective component 18 through the hollow transparent component of the inner hollow rod 16, receives the photoelectric signal, and determines that the air supply valve is in a stable state of normal use. When the valve stem 4 is locally deformed or broken, or the valve stem 4 is locally deformed or tilted, resulting in a deviation in the opening and closing degree of the air supply valve, the inner hollow rod 16, the photoelectric sensor 17 and the reflective component 18 are changed from the original vertical coaxial state to a mutually staggered distribution form, so that the photoelectric sensor 17 cannot receive the photoelectric transmission signal well and stably, that is, under the action of numerical control equipment and electronic data information components, an abnormal use warning is issued, thereby achieving the monitoring effect of the air supply valve.

[0036] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A monitoring device for a main shaft air supply valve of a hydro-turbine generator set, comprising: A valve cylinder (1) has a valve seat (2) fixedly connected to its bottom, a valve disc (3) movably mounted below the valve seat (2), the top center of the valve disc (3) being connected to the lower end of a valve stem (4) movably mounted inside the valve cylinder (1), a return spring (5) being arranged on the outer side of the valve stem (4), and a guide rod (6) being fixedly mounted on the valve seat (2), the lower end of the guide rod (6) being vertically fixedly connected to the outer wall of the top edge of the valve disc (3); the valve cylinder (1) is characterized in that it further comprises: A sleeve (7) having bolts mounted on the upper end of the valve cylinder (1); a limiting member (8) is sleeved on the outer wall of the valve stem (4) located inside the sleeve (7); a positioning housing (9) is mounted on the outer wall of the sleeve (7); a telescopic bracket (10) is fixedly mounted inside the positioning housing (9); a damping wheel (11) is disposed at the end of the telescopic bracket (10) for damping and limiting the limiting member (8); The hydraulic chamber (12) is fixed to the outer wall of the positioning housing (9) and is connected to the interior of the telescopic bracket (10), and a pressure gauge (13) is also installed on the hydraulic chamber (12).

2. According to claim 1, a monitoring device for a main shaft air supply valve of a hydro-generator set, characterized in that: The cross section of the limiting member (8) is arranged in a regular hexagonal shape, the corner points of the regular hexagonal shape are arranged in a raised strip-shaped structure, and the side surface of the limiting member (8) and the damping wheel (11) are arranged in a one-to-one correspondence.

3. According to claim 2, a monitoring device for a main shaft air supply valve of a hydro-generator set, characterized in that: The telescopic bracket (10) is arranged in a broken line shape with an inner angle of 120 degrees, the interior of the back side of the telescopic bracket (10) and the interior of the hydraulic chamber (12) are interconnected, and hydraulic oil is arranged in the interconnected interiors of the two.

4. A monitoring device for a main shaft air supply valve of a hydro-generator set according to any one of claims 1 to 3, characterized in that: The positioning housing (9) and the sleeve (7) are a disassembly and installation structure connected by bolts, the positioning housing (9) and the telescopic bracket (10) correspond one to one, and a tough rod (901) is fixed to the bottom of the inner wall of the positioning housing (9), and an elastic member is provided between the tough rod (901) and the telescopic bracket (10).

5. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 4, characterized in that: The tough rod (901) and the telescopic bracket (10) are cross-distributed, and a gap is reserved at the intersection of the two.

6. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 3, characterized in that: The hydraulic chamber (12) monitors the internal oil pressure of the telescopic support (10) in real time via a pressure gauge (13) thereon, and the hydraulic chamber (12) is also provided with a valve (14), which forms a threaded disassembly and installation structure with an external oil replenishment component via a connection port thereon.

7. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 1, characterized in that: The top inner wall of the sleeve (7) and the upper end of the valve stem (4) are both mounted with permanent magnets (15) via threads and bolts, and the magnetic settings of the opposing surfaces of the permanent magnets (15) on the sleeve (7) and the permanent magnets (15) on the valve stem (4) are different.

8. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 1, characterized in that: The middle parts of the valve stem (4) and the sleeve (7) are provided with a through hole, an inner hollow rod (16) is fixed in the through hole on the valve stem (4), a photoelectric sensor (17) is fixed at the top of the through hole of the sleeve (7), and a reflective component (18) is also fixed at the inner center of the valve disc (3) directly below the valve stem (4).

9. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 8, characterized in that: The inner hollow rod (16) and the through hole on the valve stem (4) are fixedly installed and positioned in a fitting manner, and the outer side of the inner hollow rod (16) is made of ceramic silicone material and the inside is transparent.

10. A monitoring device for a main shaft air supply valve of a hydro-generator set according to claim 8, characterized in that: The inner hollow rod (16) is longer than the valve stem (4), and the inner hollow rod (16) is vertically coaxially distributed with the photoelectric sensor (17) and the reflective component (18).

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