Checking device for hydraulic large shaft gulp valve

Abstract

The utility model provides an inspection device for a hydraulic large shaft gulp valve, and relates to the technical field of hydraulic turbine set operation monitoring. The hydraulic valve comprises a valve seat and a valve disc matched with the valve seat, a support is fixedly arranged on the valve seat, a hydraulic pump is fixedly arranged on the support, a plurality of hydraulic jacks are arranged between the valve disc and a rib plate, and a hydraulic output pipe of the hydraulic pump is connected with the hydraulic jacks through a pipeline and used for pushing the rib plate to achieve vertical displacement of the valve disc. The large-shaft gulp valve buffering device guarantees that the valve disc is stressed evenly, avoids damage to the large-shaft gulp valve buffering device caused by instability of the valve disc, achieves accurate detection of displacement of the gulp valve, improves inspection work efficiency of the large-shaft gulp valve, improves inspection precision, reduces damage risks of the large-shaft gulp valve, and guarantees safe and stable operation of a water-turbine generator set.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine unit operation monitoring, in particular to an inspection device for a hydraulic large shaft air supply valve. Background Art

[0002] In order to meet the requirement of stable operation of the turbine under partial load conditions, an air supply system is generally provided to supply natural air to the bottom of the runner through the top of the upper shaft of the generator; the air supply system is composed of an air supply valve consisting of an air inlet pipe, an air supply valve, an air supply pipe, a check valve, and a silencer. When the turbine is operating under non-optimal conditions, such as low head and load rejection, the normal flow of the outlet water forms a vortex belt, and the violent disturbance of the vortex belt causes cavitation vibration. When the cavity cavitation in the tailwater pipe is severe, it causes load swing and low-frequency vertical vibration of the unit. In order to reduce cavitation damage and alleviate vibration, air is often supplied from the center of the main shaft to the inlet of the tailwater pipe or the outlet of the runner blade. For this purpose, an air supply valve is installed at the upper end of the shaft. When a large negative pressure appears at the lower part of the runner, the valve disc of the main shaft air supply valve opens under the action of the atmospheric pressure difference to supply air. When the valve disc of the main shaft air supply valve cannot be closed normally and the water guide mechanism is closed urgently, water hammer will occur, and river water will enter the air supply valve along the air supply pipe. When the water volume is too large and the air supply valve cannot drain smoothly, it will cause the upper guide bearing to be flooded, resulting in emergency shutdown of the hydro-turbine generator set. The operation of the main shaft air supply valve affects the operating conditions and safe operation of the entire unit.

[0003] In the prior art, firstly, most detection devices directly apply force to the valve core to move the valve disc up and down to inspect the main shaft air supply valve. Since the main shaft air supply valve is subjected to force at the center, the force point is small, and the uniformity of the overall force on the valve disc cannot be guaranteed. The valve disc is prone to imbalance and damage the buffer device, and the monitoring of the opening of the main shaft air supply valve is not accurate enough. Secondly, the inspection is not detailed and accurate enough through manual inspection, which is easy to damage the main shaft air supply valve buffer device, and the inspection efficiency is low. Utility Model Content

[0004] The main purpose of the utility model is to provide a hydraulic large shaft air supply valve inspection device to solve the technical problems of valve disc movement easily unbalanced and damaging the buffer device and how to accurately detect the opening of the air supply valve.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a hydraulic large-shaft air supply valve inspection device, including a valve seat and a valve disc matching the valve seat, a protective sleeve is arranged at the top of the valve disc, a valve stem that penetrates the valve disc is retractably arranged in the protective sleeve, the end of the valve stem is fixedly connected to the bottom of the valve disc, a plurality of rib plates connected to the valve seat are arranged on the outside of the protective sleeve, a bracket is fixedly arranged on the top of the valve seat, a hydraulic pump is arranged on the upper end of the bracket, a hydraulic jack is arranged between the valve disc and each rib plate, and the hydraulic pump is connected to each hydraulic jack through a pipeline.

[0006] In the preferred embodiment, a laser rangefinder is also provided on the bracket, and the distance measuring end of the laser rangefinder is facing the valve disc, so as to monitor the opening of the valve disc.

[0007] In the preferred embodiment, the hydraulic output pipe of the hydraulic pump is connected to a multi-way switch, the output ends of the multi-way switch are the same as the number of hydraulic jacks, and the output ends of the multi-way switch are connected to the hydraulic jacks through pipelines, and valves and pressure gauges are arranged on the pipelines in sequence.

[0008] In the preferred embodiment, the hydraulic jack, the hydraulic pump, the laser rangefinder, the valve and the pressure gauge are all electrically connected to the controller.

[0009] In a preferred embodiment, a plurality of limit assemblies are arranged on the top of the valve disc, and the limit assemblies are composed of two limit blocks, and the two limit blocks are symmetrically arranged on both sides of the rib plate.

[0010] In a preferred embodiment, the bracket includes a plurality of L-shaped legs, a hollow top seat arranged at the top of the legs, and a cross-shaped support frame arranged in the hollow top seat, and the bottom end of each leg is fixedly connected to the valve seat.

[0011] The utility model provides an inspection device for a hydraulic large-shaft air supply valve. The liquid pressure of the hydraulic pump is transmitted to the hydraulic jack, thereby acting on the valve disc of the large-shaft air supply valve to make it move up and down in the vertical direction. The problem of small inspection space and difficult inspection of the large-shaft air supply valve can be solved. A plurality of hydraulic jacks are arranged between the valve disc and the rib plate, which can ensure that the valve disc of the large-shaft air supply valve moves vertically up and down, avoid damage to the buffer device of the large-shaft air supply valve due to instability of the valve disc, ensure that the valve disc is uniformly stressed as a whole, thereby more accurately detecting the opening of the air supply valve, improving the inspection efficiency of the large-shaft air supply valve, improving the inspection precision, reducing the damage risk of the large-shaft air supply valve, and ensuring the safe and stable operation of the hydro-turbine generator set. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1 It is the overall structure diagram of the utility model;

[0014] Figure 2 It is a front cross-sectional view of the utility model when the air supply valve is opened;

[0015] Figure 3 This is a top view of the gas supply valve of the utility model;

[0016] Figure 4 This is a structural diagram of the support of the utility model;

[0017] Figure 5 This is a structural diagram of a multi-way switch of the utility model.

[0018] In the figure: valve seat 1; valve disc 2; rib plate 3; hydraulic jack 4; bracket 5; hydraulic pump 6; laser rangefinder 7; controller 8; support leg 501; top seat 502; support frame 503; limit block 9; casing 10; valve stem 11; multi-way switch 12; pressure gauge 13; valve 14. DETAILED DESCRIPTION

[0019] Example 1

[0020] like Figure 1-5 As shown, it includes a valve seat 1 and a valve disc 2 matched with the valve seat 1, a casing 10 is arranged on the top of the valve disc 2, a valve stem 11 penetrating the valve disc 2 is telescopically arranged in the casing 10, the end of the valve stem 11 is fixedly connected to the bottom of the valve disc 2, a plurality of ribs 3 connected to the valve seat 1 are arranged on the outside of the casing 10, a bracket 5 is fixedly arranged on the top of the valve seat 1, a hydraulic pump 6 is arranged on the upper end of the bracket 5, a hydraulic jack 4 is arranged between the valve disc 2 and each rib 3, and the hydraulic pump 6 is connected to each hydraulic jack 4 through a pipeline.

[0021] This embodiment is based on the inspection status of the main shaft air supply valve of the turbine generator set, uses the mechanical design method, fully considers the convenience and practicality of on-site operation, and uses a new ultra-thin hydraulic jack and an electric hydraulic pump based on the small spacing between the valve disc 2 and the rib plate 3. The valve seat 1 is fixedly connected to the bracket 5, which can be done by bolts, welding or bonding.

[0022] like Figure 2 As shown, the hydraulic pipeline of the hydraulic pump 6 transmits the liquid pressure to the hydraulic jack 4, thereby acting on the valve disc 2 of the main shaft air supply valve, allowing it to drive the valve stem 11 to move up and down in the vertical direction, which can solve the problem of small inspection space and difficult inspection of the main shaft air supply valve. A number of hydraulic jacks 4 are arranged between the valve disc and the rib plate, which can ensure that the valve disc 2 of the main shaft air supply valve moves vertically up and down, avoid damage to the buffer device at the upper end of the valve stem 11 due to instability of the valve disc, and ensure that the valve disc 2 is evenly stressed and moves up and down synchronously, so as to more accurately detect the opening of the air supply valve, improve the inspection efficiency of the main shaft air supply valve, improve the inspection precision, reduce the damage risk of the main shaft air supply valve, and ensure the safe and stable operation of the hydro-turbine generator set.

[0023] like Figure 3 As shown, in this embodiment, the valve stem 11 located at the center of the valve disc 2 has a buffer device arranged inside its top end. Firstly, the valve disc 2 moves up and down synchronously without damaging the buffer device of the main shaft air supply valve; secondly, it is convenient to monitor the displacement of the valve disc 2.

[0024] In the preferred embodiment, a laser rangefinder 7 is further provided on the bracket 5 , and a distance measuring end of the laser rangefinder 7 faces the valve disc 2 for monitoring the opening of the valve disc 2 .

[0025] The laser rangefinder 7 is arranged on the lower surface of the top seat 502 of the bracket 5, and is located in the vertical direction of the valve disc 2, and there is no obstruction between the two, and can be fixed by bolts or adhesives. The displacement of the valve disc 2 is monitored by the laser rangefinder 7, and the flexible movement degree of the main shaft air supply valve is judged by observing the movement and displacement of the valve disc 2, thereby realizing the inspection function of the main shaft air supply valve. The hydraulic pump laser rangefinder 7 can detect the displacement of the valve disc 2 of the main shaft air supply valve in real time, and understand the opening of the main shaft air supply valve in real time.

[0026] In a preferred embodiment, a plurality of limit assemblies 9 are disposed on the top of the valve disc 2 . The limit assemblies 9 are composed of two limit blocks, and the two limit blocks are symmetrically disposed on both sides of the rib plate 3 .

[0027] like Figure 3 As shown, the number of the limiter assemblies 9 in this embodiment is set to two groups. To ensure the uniform force of the valve disc 2, the limiter blocks 9 in this embodiment are symmetrically arranged, and can also be designed to other numbers according to actual conditions, such as 4 groups, and arranged accordingly according to the distribution of the rib plates 3.

[0028] In the preferred embodiment, the hydraulic output pipe of the hydraulic pump 6 is connected to the multi-way switch 12, the output ends of the multi-way switch 12 are the same as the number of hydraulic jacks 4, and the output ends of the multi-way switch 12 are connected to the hydraulic jacks 4 through pipelines, and valves 14 and pressure gauges 13 are arranged on the pipelines in sequence.

[0029] like Figure 5 As shown, by setting the valve 14 and the pressure gauge 13, the force of each hydraulic jack 4 is adjusted to ensure that the valve disc 2 moves up and down synchronously in all directions.

[0030] In the preferred embodiment, the hydraulic jack 4, the hydraulic pump 6, the laser rangefinder 7, the valve 14 and the pressure gauge 13 are all electrically connected to the controller 8. The controller 8 is used to realize automatic control and monitoring, and an external display can also be connected to monitor and adjust in real time to ensure that the valve disc 2 is subjected to force in all directions and moves synchronously.

[0031] In a preferred embodiment, the bracket 5 includes a plurality of L-shaped legs 501 , a hollow top seat 502 disposed at the top of the legs 501 , and a cross-shaped support frame 503 disposed in the hollow top seat 502 , and the bottom end of each leg 501 is fixedly connected to the valve seat 1 .

[0032] like Figure 4 As shown, in this embodiment, the bracket 5 is symmetrically arranged and fixed on the valve seat 1, and the bottom end of each support leg 501 is separated from the valve disc 2, which further ensures the uniformity of the overall force of the valve disc 2.

[0033] During use, the hydraulic pump 6 of this embodiment transmits liquid pressure to the hydraulic jack 4, thereby acting on the valve disc 2 of the main shaft air supply valve, allowing it to move up and down in the vertical direction. A number of hydraulic jacks are arranged between the valve disc and the rib plate, which can ensure that the valve disc 2 as a whole moves vertically up and down synchronously, ensuring that the valve disc 2 as a whole is evenly stressed, thereby avoiding damage to the buffer device of the main shaft air supply valve due to the instability of the valve disc 2, and then using the laser rangefinder 7 to detect the opening of the main shaft air supply valve, so as to achieve accurate detection of the opening of the air supply valve, improve the inspection efficiency of the main shaft air supply valve, improve the inspection precision, reduce the risk of damage to the main shaft air supply valve, and ensure the safe and stable operation of the hydro-turbine generator set.

[0034] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. An inspection device for a hydraulic large shaft air supply valve, comprising a valve seat (1) and a valve disc (2) matched with the valve seat (1), a protective sleeve (10) being arranged at the top end of the valve disc (2), a valve stem (11) penetrating the valve disc (2) being retractably arranged in the protective sleeve (10), an end of the valve stem (11) being fixedly connected to the bottom of the valve disc (2), a plurality of ribs (3) connected to the valve seat (1) being arranged outside the protective sleeve (10), and the characteristics thereof are: A bracket (5) is fixedly arranged on the top of the valve seat (1), a hydraulic pump (6) is arranged on the upper end of the bracket (5), a hydraulic jack (4) is arranged between the valve disc (2) and each rib plate (3), and the hydraulic pump (6) is connected to each hydraulic jack (4) through a pipeline.

2. The inspection device for the hydraulic large shaft air supply valve according to claim 1 is characterized in that: A laser rangefinder (7) is also provided on the bracket (5), and a distance measuring end of the laser rangefinder (7) faces the valve disc (2) and is used to monitor the opening of the valve disc (2).

3. The inspection device for the hydraulic main shaft air supply valve according to claim 2 is characterized in that: The hydraulic output pipe of the hydraulic pump (6) is connected to a multi-way switch (12), the output ends of the multi-way switch (12) are the same in number as the hydraulic jacks (4), and the output ends of the multi-way switch (12) and the hydraulic jacks (4) are connected via pipelines, and valves (14) and pressure gauges (13) are sequentially arranged on the pipelines.

4. The inspection device for the hydraulic large shaft air supply valve according to claim 3 is characterized in that: The hydraulic jack (4), the hydraulic pump (6), the laser rangefinder (7), the valve (14) and the pressure gauge (13) are all electrically connected to the controller (8).

5. The inspection device for the hydraulic large-shaft air supply valve according to claim 1 is characterized in that: A plurality of limit assemblies (9) are arranged on the top of the valve disc (2), and the limit assemblies (9) are composed of two limit blocks, and the two limit blocks are symmetrically arranged on both sides of the rib plate (3).

6. The inspection device for the hydraulic large-shaft air supply valve according to claim 1 is characterized in that: The bracket (5) comprises a plurality of L-shaped supporting legs (501), a hollow top seat (502) arranged at the top of the supporting legs (501), and a cross-shaped supporting frame (503) arranged in the hollow top seat (502), and the bottom end of each supporting leg (501) is fixedly connected to the valve seat (1).

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