Double-layer sealing structure of low-pressure regulating valve of steam compressor
By employing a double-layer sealing structure and nitrogen filling technology in the steam compressor, the problem of poor sealing in traditional steam compressors is solved, achieving efficient media sealing and leakage monitoring, and improving the safety and stability of the steam compressor.
Patent Information
- Application Number
- CN202423005607.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Traditional steam compressors cannot achieve zero leakage due to their regulating valve sealing structure. This poses a serious safety hazard, especially in fields such as chemical engineering and blast furnace smelting where there are high requirements for the amount of media leakage.
It adopts a double-layer sealing structure for the low-pressure regulating valve of the steam compressor, including an outer shell, a pneumatic actuator, a sealing cavity, an air inlet, and a one-way air inlet valve. The pneumatic actuator drives the drive shaft to rotate and fills the sealing cavity with nitrogen. The reaction force between the outer shell and the inner shell is used to reduce media leakage. At the same time, a graphite layer, a UN-type dustproof water seal, and an annular sealing ring are used to improve the sealing performance.
It effectively reduces media leakage, improves the airtightness and sealing reliability of the steam compressor, and monitors leakage through a pressure sensor to ensure safety and stability.
Smart Images
Figure CN223305991U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steam compressors, in particular to a double-layer sealing structure of a low-pressure regulating door of a steam compressor. Background Art
[0002] Steam compressors are currently widely used in a number of important industrial fields, including chemical engineering, medical treatment, food concentration, and crystallization. The steam compressor heats and pressurizes the secondary steam generated in the evaporator. The compressed steam then returns to the evaporator for use as heating steam, replacing fresh steam and achieving recycling of the secondary steam.
[0003] To save costs, many users of conventional steam compressor designs opt for a damper valve structure when targeting high evaporation volumes, low temperature rise, and high motor power. However, emerging industries (such as chemical engineering and blast furnace smelting) have strict requirements for media leakage, especially for toxic and flammable gases. The damper valve sealing structure in traditional steam compressors cannot achieve zero leakage, posing a serious safety hazard. The sealing performance of currently used imported guide vanes is insufficient to meet these requirements. Utility Model Content
[0004] In order to improve the air tightness of a steam compressor and make the sealing of a regulating door more reliable and effective, the present application provides a double-layer sealing structure of a low-pressure regulating door of a steam compressor.
[0005] The double-layer sealing structure of the low-pressure regulating door of a steam compressor provided in this application adopts the following technical solution:
[0006] A double-layer sealing structure of a low-pressure regulating door of a steam compressor includes an inner shell and a guide vane arranged in the inner shell, a transmission hole is opened on the inner shell, a transmission shaft for driving the guide vane to rotate is rotatably arranged in the transmission hole, and the transmission shaft passes through the transmission hole. It also includes an outer shell, which is sleeved on the inner shell, and a pneumatic actuator is provided on the outer shell. The drive shaft of the pneumatic actuator is connected to the transmission shaft, and a sealed cavity is provided between the outer shell and the inner shell. The transmission shaft is located in the sealed cavity, and an inflation port is provided through the inner wall of the sealed cavity, and a one-way inflation valve is provided at the inflation port.
[0007] By adopting the above technical solution, when installing the steam compressor, the outer shell is placed on the inner shell and connected to each other, and at the same time, the drive shaft of the pneumatic actuator is connected to the transmission shaft. During operation, the pneumatic actuator is used to drive the transmission shaft to rotate. At this time, a sealed cavity is formed between the outer shell and the inner shell. The one-way inflation valve and the air pump are connected to each other, and nitrogen is filled into the sealed cavity. In this way, the gap between the transmission shaft and the transmission hole will be subjected to a reaction force, thereby reducing the leakage of the medium in the inner shell from the gap between the transmission shaft and the transmission hole, thereby improving the airtightness of the steam compressor and making the sealing of the regulating door more reliable and effective.
[0008] Preferably, the outer shell is provided with a plurality of mounting bolts threadedly connected to the inner shell.
[0009] By adopting the above technical solution, the outer shell and the inner shell are assembled by using mounting bolts, which is beneficial to improving the stability between the outer shell and the inner shell.
[0010] Preferably, the outer shell and the inner shell are provided with a graphite layer.
[0011] By adopting the above technical solution, the graphite layer has good shock resistance, corrosion resistance and softness, which is beneficial to improving the stability and sealing of the structure between the outer shell and the inner shell, and ensuring that the sealed cavity has good airtightness.
[0012] Preferably, a UN-type dustproof water seal is provided between the pneumatic actuator and the outer shell, the UN-type dustproof water seal and the pneumatic actuator are fixed to each other, the driving shaft of the pneumatic actuator passes through the UN-type dustproof water seal, and the UN-type dustproof water seal and the driving shaft of the pneumatic actuator are against each other.
[0013] By adopting the above technical solution, the UN-type dustproof water seal is used to seal the pneumatic actuator and the outer shell, thereby improving the sealing performance between the pneumatic actuator and the outer shell.
[0014] Preferably, a detection port is provided through the inner wall of the sealed cavity, an air pressure sensor is connected to the detection port, the air pressure sensor is connected to a controller, the controller is connected to an alarm, and the controller is used to control the alarm to sound an alarm when the air pressure detected by the air pressure sensor is lower than a preset value.
[0015] By adopting the above technical solution, after filling the sealed cavity with nitrogen to generate high pressure in the sealed cavity, the air pressure in the sealed cavity is detected by using an air pressure sensor, and the air pressure sensor transmits the air pressure to the controller. When the air pressure detected by the air pressure sensor is lower than the preset value, the controller determines that there may be a leakage between the outer shell and the inner shell. At this time, the controller controls the alarm to sound an alarm, thereby automatically sounding an alarm when the air pressure in the sealed cavity drops, thereby playing a monitoring and warning role.
[0016] Preferably, one end of the transmission shaft located in the sealed cavity is connected to a shift block, and a coupling sleeve is provided between the driving shaft and the transmission shaft of the pneumatic actuator.
[0017] By adopting the above technical solution, when assembling the outer shell and the inner shell, the driving shaft and the transmission shaft of the pneumatic actuator can be quickly connected by using the coupling sleeve, thereby improving the convenience of assembly.
[0018] Preferably, a pressure plate is connected to the driving shaft of the pneumatic actuator, and the pressure plate abuts against one end of the coupling sleeve, and the pressure plate drives the other end of the coupling sleeve to abut against the surface of the shift block.
[0019] Preferably, an annular groove is provided at one end of the coupling sleeve facing the shift block, an annular sealing ring is provided in the annular groove, and the annular sealing ring abuts against the surface of the shift block.
[0020] By adopting the above technical solution, the pressure plate is used to abut against the coupling sleeve, and the coupling sleeve is driven to abut against the surface of the shift block. When the pneumatic actuator drives the coupling sleeve to rotate, the shift block rotates together and drives several guide vanes to rotate at the same time. The annular sealing ring in the annular groove can improve the sealing between the coupling sleeve and the shift block, further reducing the leakage of the medium.
[0021] In summary, this application includes at least one of the following beneficial technical effects:
[0022] 1. By providing an outer shell, a pneumatic actuator, a sealed chamber, an inflation port, and a one-way inflation valve, when installing the steam compressor, the outer shell is sleeved on the inner shell and connected to each other. At the same time, the driving shaft of the pneumatic actuator is connected to the transmission shaft. During operation, the pneumatic actuator drives the transmission shaft to rotate, and a sealed chamber is formed between the outer shell and the inner shell. The one-way inflation valve is connected to the air pump, and nitrogen is filled into the sealed chamber. In this way, the gap between the transmission shaft and the transmission hole is subjected to a reaction force, thereby reducing the leakage of the medium in the inner shell through the gap between the transmission shaft and the transmission hole, improving the airtightness of the steam compressor, and making the sealing of the regulating door more reliable and effective;
[0023] 2. By setting a UN-type dustproof water seal, the UN-type dustproof water seal is used to seal the pneumatic actuator and the outer shell, thereby improving the sealing performance between the pneumatic actuator and the outer shell;
[0024] 3. By arranging the shift block, coupling sleeve, pressure plate, annular groove and annular sealing ring, when assembling the outer shell and the inner shell, the coupling sleeve is used to facilitate the quick connection between the drive shaft and the transmission shaft of the pneumatic actuator, thereby improving the convenience of assembly. The pressure plate is used to abut against the coupling sleeve, and the coupling sleeve is driven to abut against the surface of the shift block. When the pneumatic actuator drives the coupling sleeve to rotate, the shift block rotates together and drives several guide vanes to rotate at the same time. The annular sealing ring in the annular groove can improve the sealing between the coupling sleeve and the shift block, further reducing the leakage of the medium. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 This is a schematic diagram of a double-layer sealing structure of a low-pressure regulating door of a steam compressor provided in an embodiment of the present application.
[0026] Explanation of the accompanying symbols: 1. Inner casing; 11. Guide vane; 2. Transmission hole; 21. Transmission shaft; 3. Outer casing; 31. Pneumatic actuator; 311. Pressure plate; 32. Sealing chamber; 4. Inflation port; 41. One-way inflation valve; 5. Mounting bolt; 51. Graphite layer; 6. UN-type dustproof water seal; 7. Detection port; 71. Air pressure sensor; 72. Alarm; 8. Shift block; 81. Coupling sleeve; 9. Annular groove; 91. Annular sealing ring. DETAILED DESCRIPTION
[0027] The following is combined with Figure 1 This application is described in further detail.
[0028] The embodiment of the present application discloses a double-layer sealing structure of a low-pressure regulating door of a steam compressor. Figure 1 The invention comprises an inner housing 1 and a plurality of guide vanes 11 rotatably disposed within the inner housing 1. A transmission hole 2 is formed through the inner housing 1. A transmission shaft 21 is rotatably disposed within the transmission hole 2 through a circular flange graphite copper sleeve. The transmission shaft 21 is used to drive the guide vanes 11 to rotate. The transmission shaft 21 extends through the transmission hole 2. The invention also comprises an outer housing 3, which is sleeved on the inner housing 1. A pneumatic actuator 31 is mounted on the outer housing 3 via bolts. The drive shaft of the pneumatic actuator 31 is connected to the transmission shaft 21.
[0029] Reference Figure 1A sealed cavity 32 is provided between the outer shell 3 and the inner shell 1, and the transmission shaft 21 is located in the sealed cavity 32. An inflation port 4 is provided through the inner wall of the sealed cavity 32, and a one-way inflation valve 41 is provided at the inflation port 4. When installing the steam compressor, the outer shell 3 is sleeved on the inner shell 1 and connected to each other. At the same time, the drive shaft of the pneumatic actuator 31 is connected to the transmission shaft 21. When working, the pneumatic actuator 31 is used to drive the transmission shaft 21 to rotate. At this time, a sealed cavity 32 is formed between the outer shell 3 and the inner shell 1. The one-way inflation valve 41 is connected to the air pump to fill the sealed cavity 32 with nitrogen. In this way, the gap between the transmission shaft 21 and the transmission hole 2 will be subjected to a reaction force, thereby reducing the leakage of the medium in the inner shell 1 from the gap between the transmission shaft 21 and the transmission hole 2.
[0030] Reference Figure 1 Several mounting bolts 5 are threadedly provided on the outer shell 3 and connected to the inner shell 1. Using these mounting bolts 5 to assemble the outer shell 3 and inner shell 1 helps improve the stability between the outer shell 3 and the inner shell 1. The outer shell 3 and the inner shell 1 are provided with a graphite layer 51. The graphite layer 51 has excellent shock resistance, corrosion resistance, and flexibility, which helps improve the structural stability and sealing between the outer shell 3 and the inner shell 1, ensuring that the sealed cavity 32 is airtight.
[0031] Reference Figure 1 A UN-type dustproof water seal 6 is installed between the pneumatic actuator 31 and the outer shell 3. The UN-type dustproof water seal 6 and the pneumatic actuator 31 are bolted together. The drive shaft of the pneumatic actuator 31 passes through the UN-type dustproof water seal 6 and abuts against the drive shaft of the pneumatic actuator 31. The UN-type dustproof water seal 6 seals the pneumatic actuator 31 and the outer shell 3, improving the sealing between the pneumatic actuator 31 and the outer shell 3.
[0032] Reference Figure 1 A detection port 7 is provided through the inner wall of the sealed cavity 32, and an air pressure sensor 71 is connected to the detection port 7. The air pressure sensor 71 is connected to the controller, and the controller is connected to the alarm 72. After the sealed cavity 32 is filled with nitrogen to generate high pressure in the sealed cavity 32, the air pressure in the sealed cavity 32 is detected by the air pressure sensor 71, and the air pressure sensor 71 transmits the air pressure to the controller. When the air pressure detected by the air pressure sensor 71 is lower than the preset value, the controller determines that there may be a leakage between the outer shell 3 and the inner shell 1. At this time, the controller controls the alarm 72 to alarm, thereby automatically alarming when the air pressure in the sealed cavity 32 is reduced, playing a monitoring and warning role.
[0033] Reference Figure 1One end of the transmission shaft 21 located in the sealed cavity 32 is connected to the shift block 8, and a coupling sleeve 81 is provided between the driving shaft of the pneumatic actuator 31 and the transmission shaft 21. When the pneumatic actuator 31 drives the coupling sleeve 81 to rotate, the shift block 8 rotates together to drive the guide vanes 11 to rotate at the same time. When assembling the outer shell 3 and the inner shell 1, the coupling sleeve 81 is used to facilitate the quick connection between the driving shaft of the pneumatic actuator 31 and the transmission shaft 21, thereby improving the convenience of assembly.
[0034] Reference Figure 1 A pressure plate 311 is connected to the drive shaft of the pneumatic actuator 31. This pressure plate 311 abuts one end of the coupling sleeve 81, forcing the other end of the coupling sleeve 81 to abut against the surface of the shift block 8. An annular groove 9 is defined on the end of the coupling sleeve 81 facing the shift block 8. An annular sealing ring 91 is disposed within the annular groove 9, abutting against the surface of the shift block 8. By abutting the pressure plate 311 against the coupling sleeve 81 and driving the coupling sleeve 81 against the surface of the shift block 8, the annular sealing ring 91 in the annular groove 9 improves the seal between the coupling sleeve 81 and the shift block 8, further reducing medium leakage.
[0035] The implementation principle of the double-layer sealing structure of the low-pressure regulating door of a steam compressor in the embodiment of the present application is as follows: when installing the steam compressor, the outer shell 3 is mounted on the inner shell 1 and connected to each other, and the drive shaft of the pneumatic actuator 31 and the transmission shaft 21 are connected to each other through a coupling. During operation, the pneumatic actuator 31 is used to drive the transmission shaft 21 to rotate, and at this time a sealed cavity 32 is formed between the outer shell 3 and the inner shell 1. The one-way inflation valve 41 is connected to the air pump to fill the sealed cavity 32 with nitrogen, so that the gap between the transmission shaft 21 and the transmission hole 2 will be subjected to a reaction force, thereby reducing the leakage of the medium in the inner shell 1 from the gap between the transmission shaft 21 and the transmission hole 2. At the same time, the UN-type dustproof water seal 6 seals the pneumatic actuator 31 and the outer shell 3, and the annular sealing ring 91 seals between the annular groove 9, the coupling sleeve 81 and the shift block 8, thereby improving the airtightness of the steam compressor and making the regulating door sealing structure more reliable and effective.
[0036] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A double-layer sealing structure for a low-pressure regulating door of a steam compressor, comprising an inner shell (1) and a guide vane (11) arranged in the inner shell (1), wherein a transmission hole (2) is opened on the inner shell (1), a transmission shaft (21) is rotatably arranged in the transmission hole (2) for driving the guide vane (11) to rotate, and the transmission shaft (21) passes through the transmission hole (2), characterized in that: The invention also includes an outer shell (3), the outer shell (3) being sleeved on the inner shell (1), a pneumatic actuator (31) being provided on the outer shell (3), a drive shaft of the pneumatic actuator (31) being connected to a transmission shaft (21), a sealed cavity (32) being provided between the outer shell (3) and the inner shell (1), the transmission shaft (21) being located in the sealed cavity (32), an inflation port (4) being provided through the inner wall of the sealed cavity (32), and a one-way inflation valve (41) being provided at the inflation port (4).
2. A double-layer sealing structure for a low-pressure regulating door of a steam compressor according to claim 1, characterized in that: The outer shell (3) is provided with a plurality of mounting bolts (5) threadedly connected to the inner shell (1).
3. The double-layer sealing structure of the low-pressure regulating door of a steam compressor according to claim 2, characterized in that: The outer shell (3) and the inner shell (1) are provided with a graphite layer (51).
4. The double-layer sealing structure of a steam compressor low-pressure regulating door according to claim 1, characterized in that: A UN-type dustproof water seal (6) is provided between the pneumatic actuator (31) and the outer shell (3); the UN-type dustproof water seal (6) and the pneumatic actuator (31) are fixed to each other; the driving shaft of the pneumatic actuator (31) passes through the UN-type dustproof water seal (6); and the UN-type dustproof water seal (6) and the driving shaft of the pneumatic actuator (31) are abutted against each other.
5. The double-layer sealing structure of a steam compressor low-pressure regulating door according to claim 1, characterized in that: A detection port (7) is provided through the inner wall of the sealed cavity (32), and an air pressure sensor (71) is connected to the detection port (7). The air pressure sensor (71) is connected to a controller, and the controller is connected to an alarm (72). The controller is used to control the alarm (72) to sound an alarm when the air pressure detected by the air pressure sensor (71) is lower than a preset value.
6. The double-layer sealing structure of a steam compressor low-pressure regulating door according to claim 1, characterized in that: One end of the transmission shaft (21) located in the sealed cavity (32) is connected to a shift block (8), and a coupling sleeve (81) is provided between the driving shaft of the pneumatic actuator (31) and the transmission shaft (21).
7. The double-layer sealing structure of a steam compressor low-pressure regulating door according to claim 6, characterized in that: A pressure plate (311) is connected to the driving shaft of the pneumatic actuator (31), and the pressure plate (311) abuts against one end of the coupling sleeve (81). The pressure plate (311) drives the other end of the coupling sleeve (81) to abut against the surface of the shift block (8).
8. The double-layer sealing structure of the low-pressure regulating door of a steam compressor according to claim 7, characterized in that: An annular groove (9) is provided at one end of the coupling sleeve (81) facing the shift block (8), an annular sealing ring (91) is provided in the annular groove (9), and the annular sealing ring (91) abuts against the surface of the shift block (8).