Dehumidifying and drying device for PT-LA cabinet

Abstract

The utility model provides a dehumidifying and drying device for a PT-LA cabinet, which belongs to the technical field of PT cabinet dehumidification and comprises three PT-LA cabinet assemblies, a forced circulation air drying box is fixedly mounted on the side portion of each PT-LA cabinet assembly, a water gas conveying pipe is mounted on the top of each forced circulation air drying box, and the water gas conveying pipes are communicated with the PT-LA cabinet assemblies. A 90-degree elbow is mounted at the end part of the water gas conveying pipe, and the water gas conveying pipe is connected with the forced circulation air drying box through the 90-degree elbow. According to the utility model, the drying system adopts a large-flow air closed circulation drying mode to continuously dry the air circulation in the PT cabinet, so that the humidity in the PT cabinet can be kept at a very low level, meanwhile, the sealing requirement on the PT cabinet is relatively low, the relative humidity in the PT cabinet can be monitored and displayed in real time, and the relative humidity in the PT cabinet can be monitored and displayed in real time by setting the upper limit and the lower limit. Start and stop of the device are automatically controlled, the drying system is high in integration degree, and on-site construction is convenient.

Description

Technical Field

[0001] This utility model relates to the field of PT-LA cabinet dehumidification technology, specifically a dehumidification and drying device for PT-LA cabinets. Background Technology

[0002] Power plants located in coastal areas have relatively humid environments, and all electrical equipment operates in environments with high humidity. Due to the poor sealing of older cabinets, insulation components are prone to moisture absorption, which reduces insulation strength and affects the safety and reliability of equipment operation.

[0003] Most existing PT cabinets are made of profile or folded plate splicing structure, which has relatively poor sealing effect and makes the inside of the cabinet easy to get damp. They often use heaters installed inside the cabinet to dehumidify, but this results in very poor drying effect. Utility Model Content

[0004] To overcome the above deficiencies, this utility model provides a PT-LA cabinet dehumidification and drying device that overcomes or at least partially solves the above technical problems.

[0005] This utility model is implemented as follows:

[0006] This utility model provides a dehumidification and drying device for PT-LA cabinets, including a PT-LA cabinet assembly. Three PT-LA cabinet assemblies are provided. A forced circulation air drying box is fixedly installed on the side of the PT-LA cabinet assembly. A water-gas delivery pipe is installed on the top of the forced circulation air drying box. A 90-degree elbow is installed at the end of the water-gas delivery pipe. The water-gas delivery pipe is connected to the forced circulation air drying box through the 90-degree elbow.

[0007] In one embodiment of this utility model, a three-way pipe fitting is sleeved on the surface of the water-gas transmission pipe, and the water-gas transmission pipe is connected to the PT-LA cabinet assembly through the three-way pipe fitting. A manual ball valve is installed inside the water-gas transmission pipe.

[0008] In one embodiment of this utility model, a pipe clamp is installed on the top of the forced circulating air drying box, an external connector is sleeved inside the pipe clamp, and a union is installed on the top of the external connector. The water gas conveying pipe is connected to the forced circulating air drying box through the union.

[0009] In one embodiment of this utility model, a sealing gasket is installed at the connection between the PT-LA cabinet assembly and the water-gas transmission pipe, and a cabinet connector is installed on the top of the sealing gasket. The water-gas transmission pipe is connected through the cabinet connector.

[0010] In one embodiment of this utility model, a bolt is installed inside the cabinet connector, a nut is threaded onto the surface of the bolt, a washer is installed between the nut and the cabinet connector, and a spring washer is installed on the top of the washer.

[0011] In one embodiment of this utility model, a metal flexible tube is installed between the three PT-LA cabinets in the assembly. A 90-degree bend is fitted onto the surface of the metal flexible tube, and a metal flexible tube connector is installed at the end of the 90-degree bend. An expansion bolt is installed between the forced circulating air drying chamber and the ground.

[0012] In one embodiment of this utility model, the forced circulation air drying box is equipped with a first adsorption tank and a second adsorption tank. The top of the first adsorption tank is connected to the outside through a water-gas transmission pipe. A third electric ball valve is installed inside the water-gas transmission pipe. A fan is installed inside the forced circulation air drying box. The fan is connected to the outside through the water-gas transmission pipe. A first electric ball valve and a second electric ball valve are installed on the surface of the water-gas transmission pipe.

[0013] In one embodiment of this utility model, a venting valve is installed between the first adsorption tank and the second adsorption tank. A water-gas delivery pipe is installed inside the venting valve. The venting valve is connected to a regeneration ball valve through the water-gas delivery pipe. A fourth electric ball valve is installed at the bottom of the regeneration ball valve.

[0014] The present invention provides a PT-LA cabinet dehumidification and drying device, the beneficial effects of which include:

[0015] 1. This utility model adopts a high-flow-rate closed-loop air circulation drying system to continuously dry the air inside the PT cabinet, which can keep the humidity inside the PT cabinet at a very low level. At the same time, the sealing requirements of the PT cabinet are relatively low. It has a good drying effect on preventing condensation in the phase-separated closed PT cabinets of both new and old power plants.

[0016] 2. This utility model uses a precision humidity sensor in the drying system to monitor and display the relative humidity inside the PT cabinet in real time, which is convenient and intuitive to observe. The system can automatically control the start and stop of the device by setting upper and lower limits. In addition, the drying system has a high degree of integration and is convenient for on-site construction. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure provided by an embodiment of the present utility model;

[0019] Figure 2 A schematic diagram of the overall B-phase view structure provided for an embodiment of this utility model;

[0020] Figure 3 A schematic diagram of the left side of the PT-LA cabinet assembly provided for an embodiment of this utility model;

[0021] Figure 4 A front view structural diagram of the PT-LA cabinet assembly provided for an embodiment of this utility model;

[0022] Figure 5 A schematic diagram of the internal structure of the forced circulation air drying oven provided for an embodiment of this utility model.

[0023] In the diagram: 1. PT-LA cabinet assembly; 2. Forced circulating air drying chamber; 3. Water and gas transmission pipe; 4. 90-degree elbow; 5. T-joint; 6. Manual ball valve; 7. Union; 8. External connector; 9. Pipe clamp; 10. Cabinet connecting parts; 11. Sealing gasket; 12. Bolt; 13. Nut; 14. Washer; 15. Spring washer; 16. Metal hose; 17. 90-degree elbow of metal hose; 18. Metal hose connector; 19. Expansion bolt; 20. First adsorption tank; 21. Second adsorption tank; 22. First electric ball valve; 23. Second electric ball valve; 24. Vent valve; 25. Regeneration ball valve; 26. Third electric ball valve; 27. Fourth electric ball valve; 28. Fan. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Example

[0025] Reference Figures 1-5This technical solution provides a dehumidification and drying device for PT-LA cabinets, comprising a PT-LA cabinet assembly 1, of which three PT-LA cabinet assemblies are provided. A forced-circulation air drying chamber 2 is fixedly installed on the side of each PT-LA cabinet assembly 1. The forced-circulation air drying chamber 2 contains a vortex fan, adsorption cylinder B, and adsorption cylinder A. The entire drying process is: external air – vortex fan – adsorption cylinder B – adsorption cylinder A – exhaust of humid air. During each working cycle, cylinders A and B are swapped every 6-8 hours. When the humidity of all three PT-LA cabinet assemblies 1 is less than the set value of 0%, the device completes one operating cycle and enters standby mode until the humidity of any one phase in the PT-LA cabinet assembly 1 reaches 60%. The system re-enters the circulating drying mode until the three-phase humidity of the PT-LA cabinet assembly 1 is all less than 30%. This cycle continues. A water-gas delivery pipe 3 is installed on the top of the forced-circulation air drying chamber 2. A 90-degree elbow 4 is installed at the end of the water-gas delivery pipe 3, connecting it to the forced-circulation air drying chamber 2 via the 90-degree elbow 4. A tee fitting 5 is fitted onto the surface of the water-gas delivery pipe 3, connecting it to the PT-LA cabinet assembly 1 via the tee fitting 5. A manual ball valve 6 is installed inside the water-gas delivery pipe 3. A pipe clamp 9 is installed on the top of the forced-circulation air drying chamber 2, with an external connector 8 fitted inside the pipe clamp 9. A union 7 is installed on the top of the external connector 8, connecting the water-gas delivery pipe 3 to the forced-circulation air drying chamber 1 via the union 7. The circulating air drying chamber 2 is connected. A sealing gasket 11 is installed at the connection between the PT-LA cabinet assembly 1 and the water-gas supply pipe 3. A cabinet connector 10 is installed on the top of the sealing gasket 11. The water-gas supply pipe 3 is connected through the cabinet connector 10. A bolt 12 is installed inside the cabinet connector 10. A nut 13 is installed on the threaded surface of the bolt 12. A washer 14 is installed between the nut 13 and the cabinet connector 10. A spring washer 15 is installed on the top of the washer 14. A metal hose 16 is installed between the three PT-LA cabinet assemblies 1. A 90-degree bend 17 of the metal hose 16 is sleeved on the surface of the metal hose 16. A metal hose connector 18 is installed at the end of the 90-degree bend 17. An expansion bolt is installed between the forced circulating air drying chamber 2 and the ground. The forced-circulation air drying chamber 2, consisting of a first adsorption tank 20 and a second adsorption tank 21, is connected to the outside via a water-gas supply pipe 3. A third electric ball valve 26 is installed inside the water-gas supply pipe 3. A fan 28 is also installed inside the forced-circulation air drying chamber 2, connected to the outside via the water-gas supply pipe 3. A first electric ball valve 22 and a second electric ball valve 23 are installed on the surface of the water-gas supply pipe 3. A vent valve 24 is installed between the first adsorption tank 20 and the second adsorption tank 21. The water-gas supply pipe 3 is installed inside the vent valve 24, which is connected to a regeneration ball valve 25 via the water-gas supply pipe 3. A fourth electric ball valve 27 is installed at the bottom of the regeneration ball valve 25.Vent valve 24 directs airflow into the second adsorption tank 21. At this time, the second adsorption tank 21 is ventilated, and the first adsorption tank 20 is heated and regenerated. Regeneration ball valve 25 directs airflow into the first adsorption tank 20, and the regenerated moisture from the first adsorption tank 20 is discharged outside the cabinet. The heater in the first adsorption tank 20 is red when it is working, and white when it is in standby mode. The gas flow in the pipeline at this time is that the air from the PT-LA cabinet assembly 1 and the fresh air supply, after passing through fan 28, flow from vent valve 24 to the second adsorption tank 21. After drying, part of the dried air is sent to the PT-LA cabinet assembly 1, and the remaining dried air is heated and regenerated in the first adsorption tank 20 before being discharged outside the cabinet through regeneration ball valve 25. The airflow of regeneration ball valve 25 is regulated by the third electric ball valve 26 and the fourth electric ball valve 27. During operation, a slight positive pressure needs to be maintained in the closed PT-LA cabinet assembly 1, which can be achieved through the first electric ball valve 22. Assembly 1 adjusts the return air volume and the pressure of the PT-LA cabinet assembly 1. If the PT-LA cabinet assembly 1 is well-sealed, resulting in excessive return air volume and high pressure, open the first electric ball valve 22 as much as possible to allow the air from the PT-LA cabinet assembly 1 to participate in the circulation drying. At this time, the second electric ball valve 23 can be closed appropriately. If the second electric ball valve 23 is closed too much, it will reduce the drying effect of the PT-LA cabinet assembly 1. The screen records the running time of the fan 28 and the running time of the heater. One cycle, the fan 28 runs for 8-16 hours, and the second adsorption tank 21 heater runs for 240-480 minutes respectively. The timer is automatically reset at the end of the cycle and restarts for the next cycle. After power-on, the equipment is in a stopped state. If the PLC and the touch screen communicate normally, the screen will display that all data is normal after online operation mode. Otherwise, it will display various numerical values ​​after connection interruption, indicating that the communication between the PLC and the touch screen is disconnected.

[0026] Specifically, the working process or principle of this PT-LA cabinet dehumidification and drying device is as follows: First, the vent valve 24 guides the second adsorption tank 21 to vent. At this time, the second adsorption tank 21 is vented, and the first adsorption tank 20 is heated and regenerated. The regeneration ball valve 25 guides the first adsorption tank 20, and the regenerated moisture from the first adsorption tank 20 is discharged outside the cabinet. The red heater in the first adsorption tank 20 indicates that the heater is heating and working, while the white heater is in standby mode. At this time, the gas flow in the pipeline is that the air from the PT-LA cabinet assembly 1 and the fresh air supply pass through the fan 28 and flow from the vent valve 24 to the second adsorption tank 21. After drying, part of the dried air is sent to the PT-LA cabinet assembly 1, and another part of the dried air is heated and regenerated by the first adsorption tank 20 and discharged outside the cabinet through the regeneration ball valve 25. The airflow of the regeneration ball valve 25 is adjusted by the third electric ball valve 26 and the fourth electric ball valve 27. During operation, it is necessary to maintain a slight positive pressure in the closed PT-LA cabinet assembly 1, which can be achieved through the first electric ball valve 26. The electric ball valve 22 regulates the return air volume and pressure of the sealed PT-LA cabinet assembly 1. If the PT-LA cabinet assembly 1 is well sealed, resulting in excessive return air volume and pressure, the first electric ball valve 22 should be opened as much as possible to allow the air from the PT-LA cabinet assembly 1 to participate in the circulation drying. At this time, the second electric ball valve 23 can be closed appropriately. If the second electric ball valve 23 is closed too much, it will reduce the drying effect of the PT-LA cabinet assembly 1. The screen records the running time of the fan 28 and the running time of the heater. One cycle of the fan 28 runs for 8-16 hours, and the second adsorption tank 21 heater runs for 240-480 minutes in total. The timer is automatically reset at the end of the cycle and restarts for the next cycle. After power is applied, the equipment is in a stopped state. If the PLC and the touch screen communicate normally, the screen will display that all data is normal after the online operation mode is activated. Otherwise, it will display various values ​​after the connection is interrupted, indicating that the communication between the PLC and the touch screen is disconnected.

Claims

1. A dehumidification and drying device for a PT-LA cabinet, comprising a PT-LA cabinet assembly (1), wherein three PT-LA cabinet assemblies (1) are provided, characterized in that, A forced-circulation air drying box (2) is fixedly installed on the side of the PT-LA cabinet assembly (1). A water-gas delivery pipe (3) is installed on the top of the forced-circulation air drying box (2). A 90-degree elbow (4) is installed at the end of the water-gas delivery pipe (3). The water-gas delivery pipe (3) is connected to the forced-circulation air drying box (2) through the 90-degree elbow (4).

2. The dehumidification and drying device for a PT-LA cabinet according to claim 1, characterized in that, The surface of the water gas transmission pipe (3) is fitted with a three-way pipe joint (5), and the water gas transmission pipe (3) is connected to the PT-LA cabinet assembly (1) through the three-way pipe joint (5). A manual ball valve (6) is installed inside the water gas transmission pipe (3).

3. A dehumidifying and drying device for a PT-LA cabinet according to claim 2, characterized in that, The forced circulation air drying box (2) is equipped with a pipe clamp (9) on the top, and an external connector (8) is sleeved inside the pipe clamp (9). A union (7) is installed on the top of the external connector (8). The water gas transmission pipe (3) is connected to the forced circulation air drying box (2) through the union (7).

4. A dehumidifying and drying device for a PT-LA cabinet according to claim 3, characterized in that, A sealing gasket (11) is installed at the connection between the PT-LA cabinet assembly (1) and the water gas transmission pipe (3). A cabinet connector (10) is installed on the top of the sealing gasket (11). The water gas transmission pipe (3) is connected through the cabinet connector (10).

5. A dehumidifying and drying device for a PT-LA cabinet according to claim 4, characterized in that, Bolts (12) are installed inside the cabinet connector (10).

6. A dehumidifying and drying device for a PT-LA cabinet according to claim 5, characterized in that, Metal flexible hoses (16) are installed between the three PT-LA cabinets in the assembly (1).

7. A dehumidifying and drying device for a PT-LA cabinet according to claim 6, characterized in that, The forced circulation air drying chamber (2) is equipped with a first adsorption tank (20) and a second adsorption tank (21). The top of the first adsorption tank (20) is connected to the outside through a water gas delivery pipe (3). A third electric ball valve (26) is installed inside the water gas delivery pipe (3). A fan (28) is installed inside the forced circulation air drying chamber (2). The fan (28) is connected to the outside through the water gas delivery pipe (3). A first electric ball valve (22) and a second electric ball valve (23) are installed on the surface of the water gas delivery pipe (3).

8. A dehumidifying and drying device for a PT-LA cabinet according to claim 7, characterized in that, A vent valve (24) is installed between the first adsorption tank (20) and the second adsorption tank (21). A water gas delivery pipe (3) is installed inside the vent valve (24). The vent valve (24) is connected to a regeneration ball valve (25) through the water gas delivery pipe (3). A fourth electric ball valve (27) is installed at the bottom of the regeneration ball valve (25). Ventilation valve (24) guides the second adsorption tank (21) to ventilate. Ventilation of the second adsorption tank (21) and heating and regeneration of the first adsorption tank (20) are achieved. Regeneration ball valve (25) guides the first adsorption tank (20) to ventilate. The moisture generated by the first adsorption tank (20) is discharged outside the cabinet. The gas flow direction of the pipeline is that the air from the PT-LA cabinet assembly (1) and the fresh air supply pass through the fan (28) and flow from the ventilation valve (24) to the second adsorption tank (21). After drying, part of the air is sent to the PT-LA cabinet assembly (1), and part of the dried air is discharged outside the cabinet after being heated and regenerated by the first adsorption tank (20) and then through the regeneration ball valve (25). The air volume of the regeneration ball valve (25) is regulated by the third electric ball valve (26) and the fourth electric ball valve (27).

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