Anti-rub clearance type water turbine main shaft seal

Abstract

The utility model relates to the technical field of water turbine main shafts, in particular to an anti-rub clearance type water turbine main shaft seal which comprises a seal seat, a fixed seal ring, a drain hole, a rotary seal ring, a water throwing ring, a temperature sensor and a limiting block. The fixed sealing ring is fixedly placed on the sealing seat, a drainage hole is formed in the fixed sealing ring and used for draining part of water flow overflowing from the top cover, the rotary sealing ring is installed on a water turbine main shaft, and the water turbine rotates along with the main shaft during operation. According to the anti-rub-impact clearance type water turbine main shaft seal, in order to prevent rub-impact between a rotary sealing ring and a fixed sealing ring of the clearance type main shaft seal, a temperature sensor is installed on the fixed sealing ring. When the rub-impact fault of the main shaft seal occurs, an alarm is given after the temperature changes, the slight rub-impact fault of the main shaft seal can be found in time at the initial stage, and damage to the main shaft seal and further damage to other equipment caused by continuous deterioration are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of a water turbine main shaft, in particular to an anti-friction clearance type water turbine main shaft seal. Background Art

[0002] The turbine main shaft seal is installed on the upper part of the turbine runner and below the water guide bearing. It mainly seals the overflowing water between the rotating parts of the turbine and the fixed parts of the top cover. It is an important water sealing device in the operation of the turbine. It is required to have high reliability, the longest possible service life, and the simplest structure.

[0003] There are many types of spindle seal structures, which can be divided into contact seals and non-contact seals according to the contact mode.

[0004] The fixed seal ring of the gap-type main shaft seal does not contact the rotating seal ring, so there is no contact wear problem during the rotation of the turbine. At the same time, the rotating and fixed seal bodies do not contact each other, and there is no need to configure a lubricating water system, which reduces the equipment system and makes its structure simple. Since the pressurized water flow is sealed through the gap, the gap between the fixed seal ring and the rotating seal ring is very small. At the same time, the rotating seal ring rotates with the turbine during operation, and there is a possibility of loosening under the influence of centrifugal force and vibration for a long time; the fixed seal ring is fixed on the top cover, and there is a long-term low-frequency vibration during the operation of the top cover. After long-term operation, there is a risk of loosening and displacement of the fixed seal ring and the seal seat. If the fixed seal ring and the rotating seal ring collide during operation, it will cause serious damage to the main shaft seal. At the same time, both components are made of metal and are installed on the main shaft and top cover of the turbine. When the collision continues, as the metal temperature rises, it will affect other metal equipment connected to it. Therefore, it is necessary to avoid collision or discover and stop the operation in time at the early stage of collision to avoid the expansion of the fault. In order to avoid friction between the rotating sealing ring and the fixed sealing ring during operation, it is necessary to monitor its operation and prevent it from shifting. Utility Model Content

[0005] The purpose of the utility model is to provide a friction-proof gap type turbine main shaft seal to solve the problem mentioned in the background technology that when friction continues to occur, the temperature of the metal rises and affects other metal equipment connected to it. Therefore, it is necessary to avoid friction or find and stop the operation in time at the early stage of friction to avoid the expansion of the fault. In order to avoid friction between the rotating sealing ring and the fixed sealing ring during operation, it is necessary to monitor their operation and prevent them from shifting.

[0006] To achieve the above-mentioned purpose, the utility model provides an anti-collision gap type turbine main shaft seal, including a sealing seat, a fixed sealing ring, a drainage hole, a rotating sealing ring, a water-slinging ring, a temperature sensor and a limit block. The sealing seat is installed on the turbine top cover and is used to place and support the fixed sealing ring. The fixed sealing ring is fixedly placed on the sealing seat. The fixed sealing ring is provided with a drainage hole for discharging part of the water overflowing from the top cover. The rotating sealing ring is installed on the turbine main shaft and rotates with the main shaft when the turbine is running, and plays a water sealing role together with the fixed sealing ring. The water-slinging ring is installed on the upper part of the rotating sealing ring to prevent the overflowing water from splashing during operation.

[0007] Preferably, the temperature sensor is installed on the side of the fixed sealing ring.

[0008] Preferably, the number of the temperature sensors is two, the angle between the two temperature sensors is 90°, and the temperature of the fixed sealing ring is monitored in two vertical directions. The measured temperature is uploaded to the monitoring system of the hydro-generator set, and an alarm is issued when the normal operating temperature is exceeded.

[0009] Preferably, the limit block is made of carbon steel metal material. After the sealing seat is installed and adjusted, the limit block is welded and installed on the top cover in four symmetrical directions of the sealing seat to limit the movement of the sealing seat.

[0010] Preferably, the fixed sealing ring is composed of two semicircles combined by bolts.

[0011] Preferably, two comb-tooth-shaped sealing grooves are provided on the inner circumference of the fixed sealing ring, which can reduce the pressure of overflow water flow at the top cover.

[0012] Preferably, the rotating sealing ring is composed of two semicircles.

[0013] Preferably, the water-slinging ring is composed of two semicircles combined by bolts.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] In the anti-friction gap-type turbine main shaft seal, in order to prevent the gap-type main shaft seal rotating seal ring from rubbing against the fixed seal ring, a temperature sensor is installed on the fixed seal ring, and the monitored temperature is uploaded to the turbine generator monitoring system to monitor the operation of the main shaft seal. When a friction failure occurs in the main shaft seal, an alarm is triggered after the temperature changes, and the main shaft seal can be discovered in time at the early stage of a slight friction failure, thereby avoiding damage to the main shaft seal and further damage to other equipment caused by continued deterioration. A limit device is installed in four symmetrical directions on the main shaft seal seat, which limits its movement during operation after the seal seat is installed and adjusted, to avoid friction caused by the movement of the fixed seal ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view schematic diagram of a utility model anti-friction gap type turbine main shaft seal;

[0017] Figure 2 It is a top view of a utility model anti-friction clearance type turbine main shaft seal;

[0018] Figure 3 This is a partial enlarged view of the temperature monitoring and limit block of the utility model.

[0019] The meaning of each number in the figure is:

[0020] 1. Sealing seat; 2. Fixed sealing ring; 3. Drain hole; 4. Rotating sealing ring; 5. Water throwing ring; 6. Temperature sensor; 7. Limit block. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model provides an anti-friction clearance type water turbine main shaft seal, such as Figure 1-Figure 3 As shown, it includes a sealing seat 1, a fixed sealing ring 2, a drainage hole 3, a rotating sealing ring 4, a water-spinning ring 5, a temperature sensor 6 and a limit block 7. The sealing seat 1 is installed on the top cover of the turbine and is used to place and support the fixed sealing ring 2. The fixed sealing ring 2 is fixedly placed on the sealing seat 1. The fixed sealing ring 2 is provided with a drainage hole 3 for discharging part of the water overflowing from the top cover. The rotating sealing ring 4 is installed on the main shaft of the turbine and rotates with the main shaft when the turbine is running. It plays a water sealing role together with the fixed sealing ring 2. The water-spinning ring 5 is installed on the upper part of the rotating sealing ring 4 to prevent the overflowing water from splashing during operation.

[0023] In this embodiment, the temperature sensor 6 is installed on the side of the fixed sealing ring 2 to facilitate temperature monitoring.

[0024] Specifically, there are two temperature sensors 6, the angle between the two temperature sensors 6 is 90°, and the temperature of the fixed sealing ring 2 is monitored in two vertical directions. The measured temperature is uploaded to the monitoring system of the hydro-generator set, and an alarm is issued when the normal operating temperature is exceeded.

[0025] Furthermore, the limit block 7 is made of carbon steel metal material. After the sealing seat 1 is installed and adjusted, the limit block 7 is welded and installed on the top cover in four symmetrical directions of the sealing seat 1 to limit the movement of the sealing seat 1.

[0026] Furthermore, the fixed sealing ring 2 is composed of two semicircles assembled by bolts, which is convenient for assembly and disassembly.

[0027] Furthermore, two comb-tooth-shaped sealing grooves are provided on the inner circumference of the fixed sealing ring 2, which can play a role in reducing the pressure of the overflow water flow at the top cover.

[0028] Furthermore, the rotating sealing ring 4 is composed of two semicircles, which is convenient for assembly and disassembly.

[0029] Furthermore, the water-slinging ring 5 is composed of two semicircles assembled by bolts, which is convenient for assembly and disassembly.

[0030] When the anti-friction gap type turbine main shaft seal of the utility model is used, first, the sealing seat 1 is installed on the turbine top cover, which is used to place and support the fixed sealing ring 2. The fixed sealing ring 2 is fixedly placed on the sealing seat 1, and is provided with a drainage hole 3, which is used to discharge part of the water overflowing from the top cover. Secondly, the rotating sealing ring 4 is installed on the turbine main shaft, and rotates with the main shaft when the turbine is running, and plays a water sealing role together with the fixed sealing ring 2. The water-slinging ring 5 is installed on the upper part of the rotating sealing ring 4 to prevent the overflowing water from splashing during operation;

[0031] In addition, the temperature sensor 6 is installed on the side of the fixed sealing ring 2 for temperature monitoring. When the temperature is too high, an alarm signal will be sent to the monitoring system of the hydro-generator set. Finally, the limit block 7 is made of carbon steel metal material. After the sealing seat 1 is installed and adjusted, the limit block 7 is welded and installed on the top cover in four symmetrical directions of the sealing seat 1 to limit the movement of the sealing seat 1.

[0032] At the same time, the fixed sealing ring 2 is composed of two semicircles combined by bolts, which is convenient for assembly and disassembly. Two comb-shaped sealing grooves are arranged on the inner circle side of the fixed sealing ring 2, which can play a role in reducing the pressure of the overflow water flow at the top cover. The rotating sealing ring 4 is composed of two semicircles combined, which is convenient for assembly and disassembly. The water-slinging ring 5 is composed of two semicircles combined by bolts, which is convenient for assembly and disassembly.

[0033] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. An anti-friction clearance type turbine main shaft seal, characterized in that: The invention comprises a sealing seat (1), a fixed sealing ring (2), a drainage hole (3), a rotating sealing ring (4), a water-slinging ring (5), a temperature sensor (6) and a stop block (7); the sealing seat (1) is mounted on a top cover of a water turbine; the fixed sealing ring (2) is fixedly placed on the sealing seat (1); the fixed sealing ring (2) is provided with a drainage hole (3); the rotating sealing ring (4) is mounted on a main shaft of the water turbine and rotates with the main shaft when the water turbine is running; and the water-slinging ring (5) is mounted on the upper part of the rotating sealing ring (4).

2. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: The temperature sensor (6) is installed on the side of the fixed sealing ring (2).

3. The anti-friction clearance type turbine main shaft seal according to claim 2, characterized in that: The number of the temperature sensors (6) is two, and the angle between the two temperature sensors (6) is 90°.

4. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: The limit block (7) is made of carbon steel metal material.

5. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: The fixed sealing ring (2) is composed of two semicircles assembled by bolts.

6. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: Two comb-tooth-shaped sealing grooves are arranged on the inner circumference of the fixed sealing ring (2).

7. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: The rotating sealing ring (4) is composed of two semicircles.

8. The anti-friction clearance type turbine main shaft seal according to claim 1, characterized in that: The water-slinging ring (5) is composed of two semicircles assembled by bolts.

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