An air cooler leakage monitoring device in a wind tunnel

Abstract

The present invention provides a water leakage monitoring device for an air cooler in a wind tunnel, belonging to the technical field of hydropower stations. The technical solution is as follows: it includes a water receiving tank arranged below the air cooler, a water leakage sensor arranged in the water receiving tank, and a fixing structure for fixing the water leakage sensor; the fixing structure includes a circular pressing block, a semi-circular top plate, and a semi-circular ring side plate arranged at the edge of the semi-circular top plate. A screw rod is arranged on the semi-circular top plate through threaded connection. A blind hole matching with the screw rod is arranged on the upper end surface of the circular pressing block. The circular pressing block presses on the water leakage sensor and is fixed by the screw rod. The air cooler and the cooling water supply pipe are connected through an expansion joint. A water receiving cover is sleeved on the expansion joint. The water receiving cover is formed by splicing two semi-circular cover bodies up and down. The lower cover body is connected to the water receiving tank through a drain pipe. The beneficial effect of the present invention is that it can monitor the water leakage condition of the air cooler.

Description

Technical Field

[0001] The present invention relates to the technical field of hydropower stations, and particularly to a leakage monitoring device for an air cooler in a wind tunnel. Background Art

[0002] A pumped-storage power station is a hydropower station that pumps water to an upper reservoir using electrical energy during low electricity load periods and generates electricity by releasing water to a lower reservoir during high electricity load peaks. The high-level water in the upper reservoir flows into the powerhouse through the water diversion system to drive the water turbine generator set to generate electrical energy, which is then input into the power grid through a step-up transformer, switchyard, and transmission line. Many large water turbine generators use a closed self-circulation air cooling method, and cold water pipes are provided in the air cooler. When a certain air cooler leaks, if not discovered in time, it is likely to cause damage to the insulation of the stator coil, resulting in grounding or phase-to-phase short-circuit faults, endangering the safety of the generator equipment; in addition, in addition to the leakage of the air cooler itself, there may also be leakage at the connection between the cooling water supply pipe and the air cooler.

[0003] When the unit is restarted after maintenance, there will be residual gas in the water circulation pipe of the air cooler, which affects the working efficiency of the air cooler. Summary of the Invention

[0004] The purpose of the present invention is to provide a device that can monitor the leakage situation of the air cooler.

[0005] The present invention is realized through the following technical solutions: A leakage monitoring device for an air cooler in a wind tunnel, characterized in that it includes a water receiving tank arranged below the air cooler, a leakage sensor arranged in the water receiving tank, and a fixing structure for fixing the leakage sensor;

[0006] The fixing structure includes a circular pressing block, a semi-circular top plate, and a semi-circular ring side plate arranged at the edge of the semi-circular top plate. A screw rod is arranged on the semi-circular top plate through threaded connection. A blind hole matching the screw rod is arranged on the upper end surface of the circular pressing block. The circular pressing block presses on the leakage sensor and is tightened by the screw rod. The semi-circular ring side plate is fixed on the water receiving tank;

[0007] The air cooler and the cooling water supply pipe are connected through an expansion joint. A water receiving cover is sleeved on the expansion joint. The water receiving cover is composed of a semi-circular upper cover body and a lower cover body spliced together. The lower cover body is connected to the water receiving tank through a drain pipe.

[0008] The lower cover body and the upper cover body can be fixed by welding, bolt connection, or other connection methods.

[0009] It further includes an exhaust pipe communicated with the water circulation pipe of the air cooler. The exhaust pipe extends into the water receiving tank and the exhaust port faces the water leakage sensor. When the unit is restarted after maintenance, there will be residual gas in the water circulation pipe of the air cooler, which affects the working efficiency of the air cooler. Therefore, the exhaust pipe is provided, and it can exhaust gas through the exhaust pipe during flushing. Water will also be carried during the exhaust process. Therefore, it can exhaust gas through the exhaust pipe in advance to improve the working efficiency of the air cooler, and at the same time, it can also monitor the discharged water. A valve is provided on the exhaust pipe.

[0010] A threading port for the water leakage sensor is reserved at the central position of the circular pressing block.

[0011] The circular pressing block and the semi-circular top plate are concentrically arranged. A semi-circular convex platform is provided on the circular pressing block at the half part inside the semi-circular top plate, and the blind hole is arranged on the convex platform. The other half part is provided with a waterproof curved surface that is high in the middle and low at both ends. This can prevent water from splashing onto the screw and rusting, affecting the service life.

[0012] A fan-shaped port communicated with the threading port is provided on the circular pressing block at the outside of the semi-circular top plate. A fan-shaped block in contact with the side wall of the fan-shaped port is inserted into the fan-shaped port. A vertical plate is provided at the upper end of the fan-shaped block, and an arc-shaped plate is provided on the vertical plate. The arc-shaped plate is sleeved on the screw and fixed by a nut. When the water leakage sensor needs to be replaced, the water leakage sensor and the wire can be taken out by removing the fan-shaped block, without disassembling the entire fixing structure.

[0013] A bracket is provided on the fan-shaped block at the outside of the vertical plate, and a pipe clamp is provided on the bracket. It can facilitate the fixing of the wire protection pipe of the water leakage sensor.

[0014] Semi-circular ring plates are provided on the inner walls of both end faces of the upper cover body and the lower cover body. The other end of the semi-circular ring plate is externally connected with a water separation plate, and a water guide plate is provided at the edge of the water separation plate; the outer diameter of the water guide plate is larger than that of the water separation plate, and the water guide plate contacts the expansion joint. If the expansion joint leaks, the water will flow into the lower cover body through the water guide plate, avoiding water from flowing out from the connection between the water receiving cover and the expansion joint.

[0015] A number of water filtering holes are provided on the water guide plate of the lower cover body. Since the water in the water receiving cover stays on the lower cover body, the water can flow out through the water filtering holes.

[0016] A number of springs are evenly distributed on the water separation plate of the lower cover body, and an annular top plate is provided on the spring. The annular top plate can top against the expansion joint to facilitate the fixing of the water receiving cover.

[0017] The leakage sensor can adopt the existing technology and can be connected to the corresponding control system, which will not be elaborated here.

[0018] The beneficial effect of the present invention is: a device capable of monitoring the water leakage situation of the air cooler. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 It is Figure 1 a partial enlarged view of part A in

[0021] Figure 3 a schematic diagram of the leakage sensor and the fixing structure.

[0022] Figure 4 a schematic diagram of the upper cover body.

[0023] Figure 5 a schematic diagram of the lower cover body.

[0024] Figure 6 a schematic diagram of the lower cover body and the expansion joint.

[0025] Figure 7 It is Figure 6 a partial enlarged view of part B in

[0026] Figure 8 a schematic diagram of the fixing structure in Embodiment 2.

[0027] Among them, the reference numerals are: 1, air cooler; 2, water receiving tank; 3, water receiving cover; 4, leakage sensor; 5, fixing structure; 6, expansion joint; 8, cooling water supply pipe; 101, exhaust pipe; 301, drain pipe; 302, upper cover body; 303, lower cover body; 304, semi-circular ring plate; 305, water separation plate; 306, water guide plate; 307, spring; 308, annular top plate; 309, water filtering hole; 501, semi-circular top plate; 502, semi-circular ring side plate; 503, screw rod; 504, circular pressing block; 505,. 506, wire passing port; 507, sector block; 058, vertical plate; 509, arc plate; 510, nut; 511, pipe clamp. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To clearly illustrate the technical features of this solution, the following elaborates on this solution through specific embodiments.

[0029] Embodiment 1:

[0030] Refer to Figures 1 - 7, the present invention is a water leakage monitoring device for an air cooler in a wind tunnel, which includes a water receiving tank 2 arranged below the air cooler 1, a water leakage sensor 4 arranged in the water receiving tank 2, and a fixing structure 5 for fixing the water leakage sensor 4;

[0031] The fixing structure 5 includes a circular pressing block 504, a semi-circular top plate 501, and a semi-circular ring side plate 502 arranged at the edge of the semi-circular top plate 501. A screw 503 is arranged on the semi-circular top plate 501 through threaded connection. A blind hole matching with the screw 503 is arranged on the upper end surface of the circular pressing block 504. The circular pressing block 504 presses on the water leakage sensor 4 and is tightened by the screw 503. The semi-circular ring side plate 502 is fixed on the water receiving tank 2;

[0032] The air cooler 1 is connected to the cooling water supply pipe 8 through an expansion joint 6. A water receiving cover 3 is sleeved on the expansion joint 6. The water receiving cover 3 is formed by splicing a semi-circular upper cover body 302 and a lower cover body 303. The lower cover body 303 is connected to the water receiving tank 2 through a drain pipe 301.

[0033] The lower cover body 303 and the upper cover body 302 can be fixed by welding, bolt connection or other connection methods.

[0034] It also includes an exhaust pipe 101 communicated with the water circulation pipe of the air cooler 1. The exhaust pipe 101 extends into the water receiving tank 2 and the exhaust port faces the water leakage sensor 4. When the unit is restarted after maintenance, there will be residual gas in the water circulation pipe of the air cooler 1, which affects the working efficiency of the air cooler 1. Therefore, the exhaust pipe 101 is provided, and air can be exhausted through the exhaust pipe 101 during flushing. Water will also be carried during the exhaust process. Therefore, air can be exhausted in advance through the exhaust pipe 101 to improve the working efficiency of the air cooler 1, and at the same time, the discharged water can be monitored.

[0035] A wire passing port 506 for the water leakage sensor 4 is reserved at the central position of the circular pressing block 504.

[0036] A fan-shaped port communicated with the wire passing port 506 is arranged on the circular pressing block 504 and outside the semi-circular top plate 501. A fan-shaped block 507 in contact with the side wall of the fan-shaped port is inserted in the fan-shaped port. A vertical plate 508 is arranged at the upper end of the fan-shaped block 507. An arc-shaped plate 509 is arranged on the vertical plate 508. The arc-shaped plate 509 is sleeved on the screw 503 and fixed by a nut 510. When the water leakage sensor 4 needs to be replaced, the water leakage sensor 4 and the wire can be taken out by removing the fan-shaped block 507 without disassembling the entire fixing structure 5.

[0037] A bracket is arranged on the fan-shaped block 507 and outside the vertical plate 508. A pipe clamp 511 is arranged on the bracket. It can facilitate the fixing of the wire protection pipe of the water leakage sensor 4. The pipe clamp 511 is annular and fixed at both ends by bolts.

[0038] On the inner walls of the two end faces of the upper cover body 302 and the lower cover body 303, semi-circular ring plates 304 are provided. The other ends of the semi-circular ring plates 304 are externally connected with water-blocking plates 305, and water guiding plates 306 are arranged at the edges of the water-blocking plates 305; the outer diameter of the water guiding plates 306 is larger than that of the water-blocking plates 305, and the water guiding plates 306 are in contact with the expansion joint 6. If the expansion joint 6 leaks, water will flow into the lower cover body 302 through the water guiding plates 306, preventing water from flowing out from the connection between the water receiving cover 3 and the expansion joint 6.

[0039] A number of water filtering holes 309 are provided on the water guiding plates 306 of the lower cover body 303. The water at the connection between the water receiving cover 3 and the expansion joint 6 can flow out through the water filtering holes 309.

[0040] A number of springs 307 are evenly distributed on the water-blocking plates 305 of the lower cover body 303, and annular top plates 308 are arranged on the springs 307. The annular top plates 308 can abut against the expansion joint 6 to facilitate the fixation of the water receiving cover 3.

[0041] The water leakage sensor 4 can adopt the existing technology and can be connected to the corresponding control system, which will not be elaborated here.

[0042] Embodiment Two:

[0043] Different from Embodiment One, in Embodiment Two, the circular pressing block 504 and the semi-circular top plate 501 of the fixing structure 5 are concentrically arranged. A semi-circular convex platform is provided on the half part of the circular pressing block 504 inside the semi-circular top plate 501, and a blind hole is arranged on the convex platform. The other half part is provided with a waterproof curved surface that is high in the middle and low at both ends. This can prevent water from splashing onto the screw 503 and rusting, affecting the service life.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0045] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "linkage", and "setting" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The technical features not described in the present invention can be realized by or adopted from the prior art and will not be elaborated here. Of course, the above description is not a limitation to the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present invention shall also fall within the protection scope of the present invention.

Claims

1. A leakage monitoring device for an air cooler in a wind tunnel, characterized in that, It includes a water receiving tank arranged below the air cooler, a water leakage sensor arranged in the water receiving tank, and a fixing structure for fixing the water leakage sensor; The fixing structure includes a circular pressing block, a semi-circular top plate, and a semi-circular ring side plate arranged at the edge of the semi-circular top plate. A screw rod is arranged on the semi-circular top plate through threaded connection. A blind hole matching with the screw rod is arranged on the upper end surface of the circular pressing block. The circular pressing block presses on the water leakage sensor and is tightened by the screw rod. The semi-circular ring side plate is fixed on the water receiving tank; The air cooler is connected to the cooling water supply pipe through an expansion joint. A water receiving cover is sleeved on the expansion joint. The water receiving cover is formed by splicing a semi-circular upper cover body and a lower cover body. The lower cover body is connected to the water receiving tank through a drain pipe; It also includes an exhaust pipe communicated with the water circulation pipe of the air cooler. The exhaust pipe extends into the water receiving tank and the exhaust port faces the water leakage sensor; Semi-circular ring plates are arranged on the inner walls of both end faces of the upper cover body and the lower cover body. The other ends of the semi-circular ring plates are externally connected with water blocking plates. Water guiding plates are arranged at the edges of the water blocking plates; A number of water filtering holes are arranged on the water guiding plate of the lower cover body; A number of springs are evenly distributed on the water blocking plate of the lower cover body. An annular top plate is arranged on the springs; A wire passing hole for the water leakage sensor is reserved at the central position of the circular pressing block; The circular pressing block and the semi-circular top plate are concentrically arranged. A semi-circular convex platform is arranged on half of the circular pressing block located inside the semi-circular top plate. The blind hole is arranged on the convex platform, and a waterproof curved surface with a middle high and both ends low is arranged on the other half; A sector-shaped opening communicated with the wire passing hole is arranged on the circular pressing block and located outside the semi-circular top plate. A sector-shaped block in contact with the side wall of the sector-shaped opening is inserted in the sector-shaped opening. A vertical plate is arranged at the upper end of the sector-shaped block. An arc-shaped plate is arranged on the vertical plate and sleeved on the screw rod and fixed by a nut; A bracket is arranged on the sector-shaped block and located outside the vertical plate. A pipe clamp is arranged on the bracket.

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