Limiting device for recording abrasion loss of main shaft seal of hydropower station

Abstract

The invention discloses a limiting device for recording the abrasion loss of a main shaft seal of a hydropower station. The limiting device comprises a limiting block arranged on a water tank cover and a displacement sensor vertically installed in a gap between the limiting block and the water tank cover. The upper side of the limiting block is installed on the floating ring through a first-stage connecting structure, and the lower side of the limiting block is correspondingly connected with the water tank cover through a second-stage connecting structure. The limiting block and the displacement sensor are arranged, the upper side of the limiting block is connected with the floating ring through the first-stage connecting structure, the lower side of the limiting block is correspondingly connected with the water tank cover through the second-stage connecting structure, and the sensor is vertically arranged at the gap between the limiting block and the water tank cover; it can be effectively guaranteed that excessive axial and radial deviation of the floating ring does not occur; the specific abrasion condition of the sealing block is monitored in real time through the displacement sensor. The monitoring device has the advantage that the sealing block of the main shaft seal can be reliably monitored.

Description

Technical Field

[0001] The invention relates to the technical field of hydropower stations, in particular to a limiting device for recording the wear amount of a main shaft seal used in a hydropower station. Background Art

[0002] The main function of the main shaft seal of a hydropower station is to effectively prevent water from overflowing from the gap between the main shaft and the top cover. The sticking and movement of the floating ring of the main shaft seal will cause excessive water leakage and flood the guide bearing, waterwheel chamber and other parts.

[0003] At present, hydropower stations have no reliable means to monitor the wear of the sealing block inside the end face water pressure self-balancing main shaft seal. Some internal monitoring methods of the main shaft seal are unable to effectively and reliably judge the health status and maintenance cycle of the equipment due to the extreme actual operating environment of the main shaft seal block. Summary of the invention

[0004] The purpose of the present invention is to provide a limiting device for recording the wear amount of the main shaft seal of a hydropower station. The present invention has the advantage of being able to reliably monitor the main shaft seal block.

[0005] The technical solution of the present invention is a limit device for recording the wear amount of the main shaft seal in a hydropower station, comprising a limit block arranged on a water tank cover and a displacement sensor vertically installed at the gap between the limit block and the water tank cover; the upper side of the limit block is installed on the floating ring through a primary connecting structure, and the lower side of the limit block is correspondingly connected to the water tank cover through a secondary connecting structure.

[0006] In the aforementioned limiting device for recording the wear amount of the main shaft seal in a hydropower station, the primary connection structure includes a fixing bolt and a connecting pin which penetrate the limiting block and connect to the floating ring.

[0007] In the aforementioned limiting device for recording the wear amount of the main shaft seal in a hydropower station, the secondary connection structure includes a U-shaped hole provided on the limiting block and a limiting bolt passing through the U-shaped hole and connected to the water tank cover.

[0008] In the aforementioned limit device for recording the wear amount of the main shaft seal in a hydropower station, the displacement sensor is used to detect the gap value β, and the gap value β is the distance between the bottom of the limit block and the water tank cover.

[0009] In the aforementioned limit device for recording the wear amount of the main shaft seal in a hydropower station, the limit device is provided with a corresponding number according to the diameter of the turbine shaft;

[0010] The diameter of the turbine shaft is ≤1000mm, and two turbines are set in symmetrical directions;

[0011] The diameter of the turbine shaft is ≥1000mm, and 4 turbine shafts are evenly arranged in the circumferential direction.

[0012] In the aforementioned limiting device for recording the wear amount of the main shaft seal in the hydropower station, the limiting block is made of stainless steel.

[0013] Compared with the prior art, the present application sets a limit block and a displacement sensor. The upper side of the limit block is connected to the floating ring through a primary connection structure, and the lower side is correspondingly connected to the water tank cover through a secondary connection structure. The sensor is vertically set in the gap between the limit block and the water tank cover.

[0014] The application can effectively ensure that the floating ring does not have excessive axial and radial deviation, and solve the problem of floating ring jamming during the operation of the end surface water pressure self-balancing spindle seal;

[0015] The present application can monitor the specific wear of the sealing block in real time through a displacement sensor, effectively solving the problem that the excessive wear of the sealing block causes the operation and maintenance personnel to make inaccurate judgments on the health status of the equipment, resulting in the unit being unable to operate reliably.

[0016] Therefore, the present invention has the advantage of being able to reliably monitor the main shaft sealing block. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a front view of the present invention;

[0018] Figure 2 It is a side view of the present invention.

[0019] The markings in the attached drawings are: 1-process bolt, 2-U-shaped hole, 3-connecting pin, 4-fixing bolt, 5-displacement sensor, 6-water tank cover, 7-floating ring. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Example. A limit device for recording the wear of the main shaft seal in a hydropower station, such as Figure 1-2 As shown, it includes a limit block arranged on the water tank cover 6 and a displacement sensor 5 vertically installed at the gap between the limit block and the water tank cover 6; the upper side of the limit block is installed on the floating ring 7 through a primary connecting structure, and the lower side of the limit block is correspondingly connected to the water tank cover 6 through a secondary connecting structure.

[0022] The primary connection structure includes a fixing bolt 4 and a connecting pin 3 which are connected to the floating ring 7 and penetrate the limit block.

[0023] The secondary connection structure includes a U-shaped hole 2 provided on the limiting block and a limiting bolt 1 passing through the U-shaped hole 2 and connected with the water tank cover 6 .

[0024] The displacement sensor 5 is used to detect the gap value β, which is the distance between the bottom of the limit block and the water tank cover 6.

[0025] The limiting devices are provided in corresponding quantities according to the diameter of the turbine shaft;

[0026] The diameter of the turbine shaft is ≤1000mm, and two turbines are set in symmetrical directions;

[0027] The diameter of the turbine shaft is ≥1000mm, and 4 turbine shafts are evenly arranged in the circumferential direction.

[0028] The limiting block is made of stainless steel.

[0029] The application is installed in the X and -X directions. During installation, the distance between the bottom of the limit block and the water tank cover 6 is measured as the initial gap value β. Figure 2 ;

[0030] When the sealing block is worn, the floating ring 7 moves downward and the displacement sensor 5 moves with it. Since the sealing block and the upper cover of the floating ring 7 are in contact with a mirror plate, the matching accuracy is high and the gap can be ignored. Therefore, the signal transmitted by the displacement sensor 5 can basically be regarded as the change value of the gap value β between the bottom of the limit block and the water tank cover 6, thereby monitoring the wear of the sealing block at any time.

Claims

1. A limit device for recording the wear of the main shaft seal in a hydropower station, characterized by: It comprises a limit block arranged on a water tank cover (6) and a displacement sensor (5) vertically installed at a gap between the limit block and the water tank cover (6); the upper side of the limit block is installed on a floating ring (7) via a primary connection structure, and the lower side of the limit block is correspondingly connected to the water tank cover (6) via a secondary connection structure.

2. The limiting device for recording the wear amount of the main shaft seal used in a hydropower station according to claim 1 is characterized in that: The primary connection structure comprises a fixing bolt (4) and a connecting pin (3) which penetrate through the limit block and are connected to the floating ring (7).

3. The limiting device for recording the wear amount of the main shaft seal used in a hydropower station according to claim 1, characterized in that: The secondary connection structure comprises a U-shaped hole (2) provided on the limit block and a limit bolt (1) passing through the U-shaped hole (2) and connected in cooperation with the water tank cover (6).

4. The limiting device for recording the wear amount of the main shaft seal used in a hydropower station according to claim 1, characterized in that: The displacement sensor (5) is used to detect a gap value β, wherein the gap value β is the distance between the bottom of the limit block and the water tank cover (6).

5. The limiting device for recording the wear amount of the main shaft seal used in a hydropower station according to claim 1, characterized in that: The limiting devices are provided in corresponding quantities according to the diameter of the turbine shaft; The diameter of the turbine shaft is ≤1000mm, and two turbines are set in symmetrical directions; The diameter of the turbine shaft is ≥1000mm, and 4 turbine shafts are evenly arranged in the circumferential direction.

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