Exhaust cylinder cooling device for steam turbine

Abstract

The utility model relates to exhaust cylinder cooling device technical field, and disclose an exhaust cylinder cooling device for steam turbine, including cylinder, the inner chamber of cylinder is installed with cooling pipe, the outer wall fixed assembly of cooling pipe has monitoring box, the top of monitoring box is installed with water outlet pipe, the inner chamber rotationally connected of monitoring box has the shaft, the outer wall fixed assembly of shaft has the impeller. This exhaust cylinder cooling device for steam turbine, through being provided with the monitoring box, and setting up the shaft and the impeller in the inner chamber of monitoring box, under the impact of water flow, make the impeller rotate, once the cooling pipe appears the block, will result in the water flow velocity slows down, thereby causing the rotating speed of impeller to slow down, at this moment the number of electric signal produced by trigger rod in a certain time reduces, and under the action of controller discovers in time, thereby can judge the water flow velocity of cooling pipe slows down, avoid traditional equipment not to have the monitoring of cooling water velocity.

Description

Technical Field

[0001] This utility model relates to the technical field of exhaust cylinder cooling devices, specifically an exhaust cylinder cooling device for steam turbines. Background Technology

[0002] The turbine exhaust cylinder is the last component of the turbine. It is used to collect the steam discharged from the last stage blades of the turbine and guide it to the condenser or other downstream equipment. The exhaust cylinder also helps to cool the steam appropriately.

[0003] In traditional steam turbine exhaust cylinders, cooling water pipes installed inside the cylinder cavity are used to initially cool the high-temperature steam. However, the industrial cooling water in traditional equipment often contains impurities, and traditional equipment lacks filtration equipment. This allows impurities to enter the cooling pipes, causing blockages inside the cavity. Furthermore, the lack of monitoring of water flow within the cooling pipes prevents timely detection of blockages, leading to reduced cooling efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a turbine exhaust cylinder cooling device that has the advantages of monitoring and filtering water flow, thus solving the problems mentioned in the background art.

[0005] This utility model provides the following technical solution: a cooling device for a steam turbine exhaust cylinder, comprising a cylinder body, a cooling pipe installed in the inner cavity of the cylinder body, a monitoring box fixedly mounted on the outer wall of the cooling pipe, a water outlet pipe installed on the top of the monitoring box, a rotating shaft rotatably connected to the inner cavity of the monitoring box, an impeller fixedly mounted on the outer wall of the rotating shaft, a trigger rod fixedly mounted on the outer wall of the rotating shaft, a trigger plate fixedly mounted on the outer wall of the monitoring box, a control board mounted on the outer wall of the monitoring box, a filter box fixedly mounted on the outer wall of the cooling pipe, a filter plate installed in the inner cavity of the filter box, a water inlet pipe installed on the top of the filter box, a collection box fixedly mounted on the bottom of the filter box, and a partition box installed in the inner cavity of the collection box.

[0006] As a preferred technical solution of this utility model: the outer wall diameter of the impeller is smaller than the inner wall diameter of the cooling pipe, and the trigger plate and the control board are electrically connected.

[0007] As a preferred technical solution of this utility model: the outer wall of the trigger rod is in contact with the outer wall of the trigger plate, and the trigger plate is made of stainless steel.

[0008] As a preferred technical solution of this utility model: the inner cavity of the filter box is connected to the inner cavity of the cooling pipe, the outer wall of the filter plate is trapezoidal, and the filter plate is made of stainless steel.

[0009] As a preferred technical solution of this utility model: the outer wall of the partition box is inverted trapezoidal, and the inner cavity of the collection box is connected to the inner cavity of the filter box.

[0010] As a preferred technical solution of this utility model: there are two collection boxes, and the two collection boxes are respectively installed on both sides of the bottom of the filter box.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] 1. The turbine exhaust cylinder cooling device, through the monitoring box and the rotating shaft and impeller installed in the inner cavity of the monitoring box, causes the impeller to rotate under the impact of water flow. Once a blockage occurs in the cooling pipe, the water flow rate will slow down, which will cause the impeller speed to slow down. At this time, the number of electrical signals generated by the trigger rod within a certain period of time will decrease, and the controller will detect it in time, thus determining that the water flow rate in the cooling pipe has slowed down, avoiding the lack of monitoring of cooling water flow rate in traditional equipment.

[0013] 2. The turbine exhaust cylinder cooling device uses a filter box installed on the outer wall of the water inlet pipe and a filter plate installed in the inner cavity of the filter box to filter the water entering the inner cavity of the cooling pipe. This prevents impurities in the industrial cooling water from entering the inner cavity of the cooling pipe, thus ensuring the normal flow of cooling water in the inner cavity of the cooling pipe and avoiding affecting the cooling of steam by the cooling pipe. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the cylinder block of this utility model;

[0016] Figure 3 This is a schematic diagram of the monitoring box structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the trigger rod structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the filter box structure of this utility model.

[0019] In the diagram: 1. Cylinder block; 2. Cooling pipe; 3. Monitoring box; 4. Water outlet pipe; 5. Shaft; 6. Impeller; 7. Trigger rod; 8. Trigger plate; 9. Control board; 10. Filter box; 11. Filter plate; 12. Collection box; 13. Isolation box; 14. Water inlet pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1 - Figure 5 A turbine exhaust cylinder cooling device includes a cylinder body 1, a cooling pipe 2 installed in the inner cavity of the cylinder body 1, a monitoring box 3 fixedly mounted on the outer wall of the cooling pipe 2, a water outlet pipe 4 installed on the top of the monitoring box 3, a rotating shaft 5 rotatably connected to the inner cavity of the monitoring box 3, an impeller 6 fixedly mounted on the outer wall of the rotating shaft 5, a trigger rod 7 fixedly mounted on the outer wall of the rotating shaft 5, a trigger plate 8 fixedly mounted on the outer wall of the monitoring box 3, a control plate 9 installed on the outer wall of the monitoring box 3, a filter box 10 fixedly mounted on the outer wall of the cooling pipe 2, a filter plate 11 installed in the inner cavity of the filter box 10, a water inlet pipe 14 installed on the top of the filter box 10, a collection box 12 fixedly mounted on the bottom of the filter box 10, and a partition box 13 installed in the inner cavity of the collection box 12.

[0022] In the above structure, the monitoring box 3 installed on the outer wall of the cooling pipe 2, and the rotating shaft 5 and impeller 6 set in the inner cavity of the monitoring box 3, are rotated in the inner cavity of the monitoring box 3 by the impact of the cooling water in the inner cavity of the cooling pipe 2. The rotation speed of the rotating shaft 5 and impeller 6 is proportional to the speed of the cooling water. When the rotating shaft 5 rotates one revolution, the trigger rod 7 will contact the outer wall of the trigger plate 8 once, thereby generating an electrical signal.

[0023] In a preferred embodiment: the outer diameter of the impeller 6 is smaller than the inner diameter of the cooling pipe 2, and the trigger plate 8 and the control plate 9 are electrically connected;

[0024] In the above structure, the rotating shaft 5 and impeller 6 installed in the inner cavity of the monitoring box 3 will rotate in the inner cavity of the monitoring box 3 due to the impact of the cooling water, thereby driving the rotation of the trigger rod 7, so that the outer wall of the trigger rod 7 contacts the trigger plate 8 and generates an electrical signal. The number of electrical signals within a certain period of time is used to determine whether the cooling water in the inner cavity of the cooling pipe 2 is flowing at a normal rate.

[0025] In a preferred embodiment: the outer wall of the trigger rod 7 is in contact with the outer wall of the trigger piece 8, and the trigger piece 8 is made of stainless steel;

[0026] In the above structure, the trigger plate 8 is set on the outer wall of the monitoring box 3, and the trigger rod 7 is set on the outer wall of the rotating shaft 5. When the trigger rod 7 rotates once, the trigger plate 8 will be triggered once, thereby generating an electrical signal. This signal is recorded under the action of the control board 9, thereby determining whether the cooling water in the inner cavity of the cooling pipe 2 is circulating normally.

[0027] In a preferred embodiment: the inner cavity of the filter box 10 is connected to the inner cavity of the cooling pipe 2, the outer wall of the filter plate 11 is trapezoidal, and the filter plate 11 is made of stainless steel.

[0028] In the above structure, the filter plate 11 installed in the inner cavity of the filter box 10 filters the water entering the inner cavity of the cooling pipe 2 under the action of the filter plate 11, so that the impurities cannot pass through the outer wall of the filter plate 11 and enter the inner cavity of the cooling pipe 2, thereby avoiding large impurities from clogging the inner cavity of the cooling pipe 2 and affecting the normal flow of cooling water.

[0029] In a preferred embodiment: the outer wall of the partition box 13 is inverted trapezoidal, and the inner cavity of the collection box 12 communicates with the inner cavity of the filter box 10;

[0030] In the above structure, the partition box 13 installed in the inner cavity of the collection box 12 can filter and block the debris under the action of the filter plate 11, so that the debris cannot pass through the outer wall of the filter plate 11 and slides down along the outer wall of the filter plate 11 and enters the inner cavity of the collection box 12. At this time, under the obstruction of the partition box 13, the debris cannot escape upward after entering the inner cavity of the collection box 12, so that the debris is better filtered under the action of the filter plate 11.

[0031] In a preferred embodiment, there are two collection boxes 12, and the two collection boxes 12 are respectively installed on both sides of the bottom of the filter box 10;

[0032] In the above structure, the collection boxes 12 installed on both sides of the bottom of the filter box 10 can collect the impurities filtered out by the filter plate 11 under the action of the collection boxes 12. Thus, under the action of the filter box 10 and the filter plate 11, the impurities in the water entering the inner cavity of the cooling pipe 2 are removed, avoiding blockage of the inner cavity of the cylinder 1.

[0033] Working Principle: During operation, when steam needs to be discharged, the temperature of the steam needs to be reduced within the cylinder 1. This requires introducing cooling water into the inner cavity of the cooling pipe 2. The cooling water is introduced into the inner cavity of the filter box 10 through the inlet pipe 14. The cooling water then contacts the outer wall of the filter plate 11, filtering the water and causing impurities to move downwards along the outer wall of the filter plate 11 and enter the inner cavity of the collection box 12. This process collects impurities from the cooling water, preventing them from entering the inner cavity of the cooling pipe 2 and thus avoiding damage to it. If the cooling water is blocked, it will flow from the cooling pipe 2 into the inner cavity of the monitoring box 3, and under the action of the water flow, it will impact the impeller 6, thereby causing the shaft 5 and the impeller 6 to rotate. During the rotation of the shaft 5, the outer wall of the trigger rod 7 will contact the outer wall of the trigger plate 8, thereby generating an electrical signal. The rotation speed of the shaft 5 is judged based on the number of electrical signals generated within a certain period of time, so as to determine whether the cooling water flow is normal. If the inner cavity of the cooling pipe 2 is blocked, the water flow rate will decrease, thereby causing the rotation speed of the shaft 5 to decrease, thus enabling timely judgment on whether the cooling water flow in the inner cavity of the cooling pipe 2 is normal.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cooling device for exhaust cylinder of steam turbine, comprising a cylinder body (1), characterized in that: The inner cavity of the cylinder (1) is equipped with a cooling pipe (2), the outer wall of the cooling pipe (2) is fixedly fitted with a monitoring box (3), the top of the monitoring box (3) is equipped with a water outlet pipe (4), the inner cavity of the monitoring box (3) is rotatably connected with a rotating shaft (5), the outer wall of the rotating shaft (5) is fixedly fitted with an impeller (6), the outer wall of the rotating shaft (5) is fixedly fitted with a trigger rod (7), the outer wall of the monitoring box (3) is fixedly fitted with a trigger plate (8), the outer wall of the monitoring box (3) is equipped with a control plate (9), the outer wall of the cooling pipe (2) is fixedly fitted with a filter box (10), the inner cavity of the filter box (10) is equipped with a filter plate (11), the top of the filter box (10) is equipped with a water inlet pipe (14), the bottom of the filter box (10) is fixedly fitted with a collection box (12), and the inner cavity of the collection box (12) is equipped with a partition box (13).

2. A cylinder cooling device for exhaust gas of a steam turbine according to claim 1, characterized in that: The outer diameter of the impeller (6) is smaller than the inner diameter of the cooling pipe (2), and the trigger plate (8) and the control plate (9) are electrically connected.

3. The turbine exhaust cylinder cooling device according to claim 1, characterized in that: The outer wall of the trigger rod (7) is in contact with the outer wall of the trigger piece (8), which is made of stainless steel.

4. A turbine exhaust cylinder cooling device according to claim 1, characterized in that: The inner cavity of the filter box (10) is connected to the inner cavity of the cooling pipe (2), the outer wall of the filter plate (11) is trapezoidal, and the filter plate (11) is made of stainless steel.

5. A turbine exhaust cylinder cooling device according to claim 1, characterized in that: The outer wall of the partition box (13) is inverted trapezoidal, and the inner cavity of the collection box (12) is connected to the inner cavity of the filter box (10).

6. A turbine exhaust cylinder cooling device according to claim 1, characterized in that: There are two collection boxes (12), and the two collection boxes (12) are respectively installed on both sides of the bottom of the filter box (10).

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