Dry gas sealing system adapting to extreme temperature working condition and temperature control method

Abstract

The invention relates to a dry gas sealing system adapting to an extreme temperature working condition and a temperature control method, and relates to the technical field of dry gas sealing, the dry gas sealing system comprises a dry gas sealing structure, a sealing cavity and a temperature control device, the temperature control device comprises an input pipe and an output pipe, and the input pipe and the output pipe are used for inputting and outputting a medium into and out of the sealing cavity; the detection piece is used for detecting the temperature in the sealing cavity; and the thermal medium mechanism and the cooling medium mechanism are communicated with the input pipe and the output pipe through a control assembly and enable the control assembly to perform control according to the temperature detected by the detection piece. The temperature in the sealing cavity is detected through the detection piece, if the detected temperature is lower than the minimum value of the proper temperature range, the control assembly starts and controls the thermal medium mechanism to heat the sealing cavity, and if the detected temperature is higher than the maximum value of the proper temperature range, the control assembly controls the cooling medium mechanism to cool the interior of the sealing cavity. The problems of material failure, thermal deformation out of control and the like of the dry gas sealing structure are reduced, and the sealing effect of the dry gas sealing structure is improved.

Description

Technical Field

[0001] This application relates to the technical field of dry gas sealing, and in particular to a dry gas sealing system and temperature control method adapted to extreme temperature conditions. Background Technology

[0002] A dry gas seal consists of a static ring and a mating rotating ring, creating a non-contact mechanical surface seal interface that generates a thin film of dry gas during operation. During operation, the rotating ring generates lift due to hydrodynamic forces, causing the static ring to separate from the rotating ring and creating a gap between them. Dry gas seals are commonly used in harsh environments such as oil and gas exploration, extraction and purification, as well as in the petrochemical industry, natural gas transportation, and chemical industry.

[0003] The core components of a dry gas seal structure (such as the rotating ring, stationary ring, and sealing ring) need to be controlled for thermal deformation. These core components can achieve a stable sealing effect within a suitable temperature range. However, when the dry gas seal structure is in an environment with a high temperature (i.e., an ultra-wide temperature range), the temperature has exceeded the suitable temperature range. This makes the core components prone to material failure and uncontrolled thermal deformation, thereby reducing the sealing effect of the dry gas seal structure. Summary of the Invention

[0004] To improve the sealing effect of the dry gas sealing structure, this application provides a dry gas sealing system and temperature control method adapted to extreme temperature conditions.

[0005] Firstly, this application provides a dry gas sealing system adapted to extreme temperature conditions, employing the following technical solution: A dry gas sealing system adapted to extreme temperature conditions includes a dry gas sealing structure for sealing the machine body, a sealing cavity disposed on the machine body and communicating with the dry gas sealing structure, and a temperature control device, wherein the temperature control device includes: The input and output pipes are connected to the sealed cavity and are used to input and output media into and out of the sealed cavity. The testing component is used to detect the temperature inside the sealed cavity; The heat transfer medium mechanism and the cooling medium mechanism are connected to the input pipe and the output pipe through the control component, and the control component controls the temperature based on the temperature detected by the detection element; The control component controls the heat medium mechanism to connect with the input pipe and the output pipe and is used to input the heating medium into the sealed cavity for heating and then output; or, the control component controls the cooling medium mechanism to connect with the input pipe and the output pipe and is used to input the cooling medium into the sealed cavity for cooling and then output.

[0006] By adopting the above technical solution, the detection element detects the temperature inside the sealed cavity. If the detected temperature is lower than the minimum value of the suitable temperature range, it indicates that the sealed cavity needs to be heated. The control component starts to connect the heating medium mechanism with the input pipe and the output pipe. The heating medium mechanism starts, and after heating, the medium passes through the input pipe and the sealed cavity to heat the sealed cavity. Then the medium is output through the output pipe to achieve heating. At the same time, the detection element detects the temperature inside the sealed cavity in real time, thereby controlling the flow rate and quantity of the medium in the sealed cavity, so that the sealed cavity can reach the required temperature more quickly.

[0007] Conversely, if the detected temperature is higher than the maximum value of the suitable temperature range, the sealing cavity needs to be cooled. The control component activates the cooling medium mechanism to connect with the input and output pipes, and the detection element detects the temperature inside the sealing cavity to achieve cooling. The cooling method is the same as the heating method, which allows the sealing cavity to reach the required temperature more quickly. This makes the environment inside the sealing cavity suitable for the dry gas sealing structure to seal, reducing problems such as material failure and uncontrolled thermal deformation in the dry gas sealing structure, and improving the sealing effect of the dry gas sealing structure.

[0008] By using two different media, heating or cooling, compared to using only one medium, the heating medium can achieve heating better, and the cooling medium can achieve cooling better, thus enabling better and faster temperature control over an ultra-wide temperature range. Furthermore, the medium entering the sealed cavity can also block external temperature conduction, thereby further improving the sealing effect of the dry gas seal structure.

[0009] Optionally, the sealing cavity is annular and forms a spiral guide groove, and the medium entering the sealing cavity forms a temperature field isolation and exchange region between the sealing cavity and the dry gas sealing structure.

[0010] By adopting the above technical solution, the annular sealing cavity increases the contact area with the dry gas sealing structure, thereby enabling faster and better control of the temperature of the sealing cavity. The guide groove design extends the medium flow time, resulting in better and faster control and improved sealing effect. At the same time, the formation of the temperature field isolation exchange area further improves the sealing effect.

[0011] Optionally, the medium inside the sealed cavity can be a liquid medium.

[0012] By adopting the above technical solution, liquid media can better and faster control the temperature inside the sealed cavity compared to gaseous media, thus further improving the sealing effect.

[0013] Optionally, it also includes a cleaning mechanism for cleaning the input pipe, the sealing cavity, and the output pipe, the cleaning mechanism comprising: An inlet pipe is connected to an input pipe and is equipped with an inlet valve for introducing inert gas into the input pipe; when purging is required, the control component is activated to disconnect the heat medium mechanism from the input pipe and connect it to the output pipe, and to connect the inlet pipe to the input pipe. A control valve is installed on the output pipe, which creates a temporary storage chamber in the output pipe for the temporary storage of residual liquid. The discharge assembly is installed on the output pipe and communicates with the temporary storage chamber. It is used to block the liquid and allow gas to pass through, so that the residual liquid remains in the temporary storage chamber. After cleaning is completed, the control valve opens and allows the medium in the temporary storage chamber to flow into the heat medium mechanism for recycling.

[0014] While the above-mentioned technical solution can improve control efficiency and effectiveness by using liquid media, the media is prone to remain in the input pipe, sealing cavity, and output pipe after input. The control methods include heating or cooling. Therefore, when the control method is changed, the residue of the previously input media can easily have an adverse effect on the subsequent temperature control method, thereby reducing the control effect and wasting energy.

[0015] After the temperature control of the heat medium mechanism is completed, the control component controls the heat medium mechanism to disconnect from the input pipe and connect to the output pipe. The inlet valve is opened and the control valve is closed. Inert gas enters the input pipe through the inlet pipe. The inert gas passes through the sealing chamber and the output pipe in sequence. Then, the inert gas is discharged through the discharge component and recycled for reuse. During the movement of the inert gas, it pushes the residual medium toward the output pipe until the residual medium is moved to the temporary storage chamber for temporary storage, thereby realizing the cleaning of the residual medium.

[0016] The control component controls the air inlet valve to close and the control valve to open, allowing the medium in the temporary storage chamber to flow back to the hot medium mechanism for recycling under gravity. Meanwhile, after the cooling medium control is completed, the cleaning steps are the same as those mentioned above, thereby reducing the adverse effects of residual medium on temperature control and enabling the recycling of residual medium, thus improving the sealing effect and reducing energy waste.

[0017] Meanwhile, the temporary storage chamber and discharge components prevent the inert gas from coming into contact with the heat medium or cooling medium, reducing the risk of the inert gas moving and taking away energy from the heat medium or cooling medium, further improving temperature control efficiency and effectiveness, enhancing sealing performance and reducing energy consumption.

[0018] Optionally, the emission assembly includes: The discharge pipe is installed on the output pipe and communicates with the temporary storage chamber, and is inclined upwards. The recovery pipe is detachably installed at the top of the discharge pipe and is used to recover inert gases; A waterproof and breathable membrane is installed at the connection between the discharge pipe and the recovery pipe to block liquid from passing through while allowing gas to pass through.

[0019] By adopting the above technical solution, the liquid is blocked from passing through the waterproof and breathable membrane, and the accumulated liquid can flow back into the temporary storage chamber under the action of gravity. This allows air to pass through the waterproof and breathable membrane while blocking the liquid from passing through. At the same time, the waterproof and breathable membrane can be replaced, which improves the temperature control efficiency and effect, improves the sealing effect, and reduces energy consumption.

[0020] Optionally, when the hot medium mechanism or cooling medium mechanism inputs the medium, the control valve is first closed, allowing the input medium to push the inert gas input during cleaning through the discharge assembly to discharge the gas, and then the control valve is opened, allowing the medium to flow normally.

[0021] By adopting the above technical solution, after cleaning is completed, the medium is input. At this time, some inert gas remains in the input pipe, sealing cavity and output pipe. The control valve is closed, and the medium enters and pushes the residual inert gas through the discharge component to be discharged. If there is some liquid, it will also be blocked by the discharge component. Then the control valve is opened, so the input medium can flow back to the hot medium mechanism or cooling medium mechanism through the output pipe.

[0022] By controlling the valve and the discharge assembly in conjunction with the medium input, residual inert gas can be discharged through the discharge assembly and then recovered. This makes the recovered inert gas easier to clean later, improves the cleaning effect and saves energy. At the same time, it reduces the space occupied by inert gas during temperature control, reduces the adverse effects of inert gas on temperature control, and improves the sealing effect.

[0023] Optionally, the medium transported by the heat transfer medium mechanism is heat-resistant synthetic oil, and the medium transported by the cooling medium mechanism is an alcohol-based solution.

[0024] By adopting the above technical solutions, the heat-resistant synthetic oil has a high heat resistance, which enables better heating, and the alcohol-based solution has a low freezing point, which enables better cooling, thereby further improving the sealing effect.

[0025] Optionally, the control component includes: The first three-way valve is connected to the heat medium mechanism, the cooling medium mechanism, and the inlet pipe; The second three-way valve is connected to the hot medium mechanism, the cooling medium mechanism, and the output pipe, so that the hot medium mechanism is connected to the input pipe and the output pipe; or, the cooling medium mechanism is connected to the input pipe and the output pipe.

[0026] By adopting the above technical solution, during heating, the first three-way valve controls the heat medium mechanism to connect with the input pipe, and the second three-way valve controls the heat medium mechanism to connect with the output pipe; during cooling, the first three-way valve controls the cooling medium mechanism to connect with the input pipe, and the second three-way valve controls the cooling medium mechanism to connect with the output pipe, thereby enabling independent heating or cooling of the sealing cavity and improving the sealing effect.

[0027] Optionally, the heat transfer medium mechanism includes: An expansion buffer tank containing a heating medium; A heater is used to heat the medium inside the expansion buffer tank. A high-temperature pump is installed on the expansion buffer tank; The inflow and return pipes are installed on the high-temperature pump and the expansion buffer tank and are respectively connected to the control components located at the input and output pipes.

[0028] By adopting the above technical solution, the heater heats the medium, and the high-temperature pump starts, so that the medium enters the sealed cavity through the inflow pipe and the input pipe. Then the medium flows back into the expansion buffer tank through the output pipe and the return pipe, thereby achieving temperature control of the sealed cavity.

[0029] Secondly, the temperature control method provided in this application adopts the following technical solution: A temperature control method includes the following steps: Temperature detection: The detection element measures the temperature inside the sealed cavity; Temperature control: If the detected temperature is lower than the specified temperature, the control component controls the heat medium mechanism to connect with the input pipe and the output pipe. The heat medium flows back through the input pipe, the sealed cavity, and then through the output pipe, thereby heating the sealed cavity. If the detected temperature is higher than the specified temperature, the control component controls the cooling medium mechanism to connect with the input and output pipes. The cooling medium flows back through the input pipe, the sealing cavity, and then through the output pipe, thereby cooling the sealing cavity and maintaining the temperature inside the sealing cavity within a suitable temperature range. Cleaning: Before changing to a different medium, the residual medium located in the input pipe, sealing cavity and output pipe is cleaned by the cleaning mechanism.

[0030] By adopting the above technical solution, the testing component can detect the temperature inside the sealed cavity; If the detected temperature is lower than the specified temperature, the control component controls the heating medium mechanism to heat the sealing cavity; if the detected temperature is higher than the specified temperature, the control component controls the cooling medium mechanism to cool the sealing cavity, so that the temperature inside the sealing cavity is maintained within a suitable temperature range; before changing to a different medium, the residual medium located in the input pipe, sealing cavity and output pipe is cleaned by the cleaning mechanism, which improves the sealing effect of the dry gas sealing structure.

[0031] In summary, this application includes at least one of the following beneficial technical effects: 1. The temperature inside the sealing cavity is detected by the detection component. If the detected temperature is lower than the minimum value of the suitable temperature range, the control component starts the control heat medium mechanism to heat the sealing cavity. If the detected temperature is higher than the maximum value of the suitable temperature range, the control component controls the cooling medium mechanism to cool the sealing cavity. This reduces problems such as material failure and uncontrolled thermal deformation in the dry gas sealing structure and improves the sealing effect of the dry gas sealing structure.

[0032] 2. By inputting two different media, heating or cooling, compared to using only one medium, the heating medium can achieve heating better, and the cooling medium can achieve cooling better, thus enabling better and faster temperature control over an ultra-wide temperature range. Moreover, the medium input into the sealing cavity can also block external temperature conduction, thereby further improving the sealing effect of the dry gas sealing structure.

[0033] 3. By opening the inlet valve and closing the control valve, the inert gas pushes the residual medium to the temporary storage chamber for temporary storage. The inert gas is discharged through the exhaust component and then recycled. After cleaning, the control component controls the inlet valve to close and the control valve to open, so that the medium in the temporary storage chamber flows back to the hot medium mechanism or the cooling medium mechanism for recycling, thereby improving the sealing effect and reducing energy waste.

[0034] 4. By setting up a temporary storage chamber and a discharge assembly, the inert gas will not come into contact with the heat medium or cooling medium mechanism, reducing the risk of the inert gas moving and taking away the energy of the heat medium or cooling medium mechanism, further improving the temperature control efficiency and effect, improving the sealing effect and reducing energy consumption. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the dry gas sealing system; Figure 2 This is a structural diagram of the heat medium mechanism and the cooling medium mechanism in a dry gas sealing system; Figure 3 This is a schematic diagram of the cleaning mechanism in a dry gas seal system.

[0036] Reference numerals: 1. Body; 11. Dry gas sealing structure; 12. Sealing cavity; 2. Temperature control device; 21. Input pipe; 22. Output pipe; 23. Detection element; 3. Heat medium mechanism; 31. Expansion buffer tank; 32. Heater; 33. High temperature pump; 34. Inflow pipe; 35. Return pipe; 36. Cooler; 4. Cooling medium mechanism; 5. Control component; 51. First three-way valve; 52. Second three-way valve; 53. Temporary storage cavity; 6. Cleaning mechanism; 61. Air inlet pipe; 62. Control valve; 63. Air inlet valve; 7. Discharge component; 71. Discharge pipe; 72. Recovery pipe; 73. Waterproof and breathable membrane. Detailed Implementation

[0037] The following provides a further detailed description of this application.

[0038] This application discloses a dry gas sealing system adapted to extreme temperature conditions.

[0039] Reference Figure 1 A dry gas sealing system adapted to extreme temperature conditions includes a dry gas sealing structure 11 for sealing the body 1, a sealing cavity 12 disposed on the body 1 and communicating with the dry gas sealing structure 11, and a temperature control device 2. The temperature control device 2 detects the temperature inside the sealing cavity 12 and adds a temperature-controlled medium into the sealing cavity 12. When heating is required, a heating medium is introduced into the sealing cavity 12; when cooling is required, a cooling medium is introduced into the sealing cavity 12. This ensures that the temperature inside the sealing cavity 12 is at a suitable temperature for the dry gas sealing structure 11, thereby improving the sealing effect of the dry gas sealing structure 11.

[0040] The sealing cavity 12 is annular and has a spiral guide groove inside. The dry gas sealing structure 11 is located inside the sealing cavity 12. The medium entering the sealing cavity 12 forms a temperature field isolation and exchange area between the inner wall of the sealing cavity 12 and the dry gas sealing structure 11.

[0041] The temperature control device 2 includes an input pipe 21 and an output pipe 22, a detection element 23, a heat medium mechanism 3 and a cooling medium mechanism 4. The input pipe 21 and the output pipe 22 are connected to the sealed cavity 12. The connection between the input pipe 21 and the sealed cavity 12 is located above the connection between the output pipe 22 and the sealed cavity 12 and on both sides of the axis of the sealed cavity 12. The detection element 23 is a temperature detector and is used to detect the temperature inside the sealed cavity 12.

[0042] The heat medium mechanism 3 and the cooling medium mechanism 4 are connected to the input pipe 21 and the output pipe 22 through the control component 5. The detection element 23 transmits the detection data to the control component 5. The dry gas sealing structure 11 has a suitable temperature range of K1-K2, and K1 < K2. Therefore, according to the temperature detected by the detection element 23, if the temperature value is less than K1, it indicates that the sealing cavity 12 needs to be heated. The control component 5 controls the heat medium mechanism 3 to connect with the input pipe 21 and the output pipe 22. The heat medium mechanism 3 is started so that the medium enters the sealing cavity 12 through the input pipe 21, and then the medium flows back to the heat medium mechanism 3 through the output pipe 22 to heat the sealing cavity 12. At the same time, the detection element 23 detects the temperature inside the sealing cavity 12 in real time. When the temperature inside the sealing cavity 12 is between K1 and K2, the heat medium mechanism 3 stops inputting and outputting the medium, so that the medium is maintained inside the sealing cavity 12, thereby maintaining the temperature inside the sealing cavity 12 at a suitable temperature and improving the sealing effect of the dry gas sealing structure 11.

[0043] If the temperature value inside the sealed cavity 12 detected by the detection element 23 is greater than K2, it indicates that the sealed cavity 12 needs to be cooled. The control component 5 controls the cooling medium mechanism 4 to connect with the input pipe 21 and the output pipe 22. The cooling medium mechanism 4 is activated so that the medium enters the sealed cavity 12 through the input pipe 21, and then the medium flows back to the cooling medium mechanism 4 through the output pipe 22 to cool the sealed cavity 12. At the same time, the control method is the same as when heating. When the temperature inside the sealed cavity 12 is between K1 and K2, the cooling medium mechanism 4 stops inputting and outputting the medium, so that the medium is kept inside the sealed cavity 12, thereby maintaining the temperature inside the sealed cavity 12 at a suitable temperature.

[0044] The heat medium mechanism 3 and the cooling medium mechanism 4 have the same structure and both transport liquid media. The difference is that the heat medium mechanism 3 transports heat-resistant synthetic oil, which can be phenyl silicone oil, can withstand temperatures up to 500℃, and K2 < 500℃. It is used to heat the heat-resistant synthetic oil. The cooling medium mechanism 4 transports alcohol-based solutions, and the freezing point of the alcohol-based solutions is lower than K1. The alcohol-based solutions can be ethylene glycol-water mixtures with a freezing point < -60℃.

[0045] The control component 5 includes a first three-way valve 51 and a second three-way valve 52. The first three-way valve 51 is connected to the heat medium mechanism 3, the cooling medium mechanism 4 and the input pipe 21; the second three-way valve 52 is connected to the heat medium mechanism 3, the cooling medium mechanism 4 and the output pipe 22, so that the heat medium mechanism 3 is connected to the input pipe 21 and the output pipe 22; or, the cooling medium mechanism 4 is connected to the input pipe 21 and the output pipe 22.

[0046] Reference Figure 1 and Figure 2The following explanation uses the heat medium mechanism 3 as an example. The heat medium mechanism 3 includes an expansion buffer tank 31, a heater 32, a high-temperature pump 33, an inflow pipe 34, and a return pipe 35. The heater 32 and the expansion buffer tank 31 are used to hold the liquid medium used for heating. When it is a cooling medium mechanism 4, it holds the liquid medium used for cooling. The heater 32 is fixedly installed in the expansion buffer tank 31 and is used to heat the medium. If it is a cooling medium mechanism 4, the heater 32 is a cooler 36, which is used to cool the medium located in the expansion buffer tank 31.

[0047] The high-temperature pump 33 is fixedly installed on the expansion buffer tank 31 and communicates with the inside of the expansion buffer tank 31. The inflow pipe 34 is fixedly installed on the high-temperature pump 33. The two inflow pipes 34 and the input pipe 21 that make up the heat medium mechanism 3 and the cooling medium mechanism 4 are all connected to the first three-way valve 51. The return pipe 35 is fixedly installed on the top of the expansion buffer tank 31. The two return pipes 35 and the output pipe 22 that make up the heat medium mechanism 3 and the cooling medium mechanism 4 are all connected to the second three-way valve 52.

[0048] The first three-way valve 51 and the second three-way valve 52 are controlled by a control box. The detection element 23 transmits the detected temperature to the control box for processing. The control box controls the first three-way valve 51 and the second three-way valve 52 according to the processing result, so that the heat medium mechanism 3 is connected to the input pipe 21 and the output pipe 22, that is, one of the inflow pipes 34 is connected to the input pipe 21 and one of the return pipes 35 is connected to the output pipe 22; or, the cooling medium mechanism 4 is connected to the input pipe 21 and the output pipe 22, that is, another inflow pipe 34 is connected to the input pipe 21 and another return pipe 35 is connected to the output pipe 22. The return pipe 35 is below the output pipe 22, so that the medium in the output pipe 22 can flow back to the expansion buffer tank 31 through the return pipe 35 under the action of gravity.

[0049] Reference Figure 1 and Figure 3 It also includes a cleaning mechanism 6 for cleaning the input pipe 21, the sealing cavity 12 and the output pipe 22. After the temperature is controlled by the heat medium mechanism 3 or the cooling medium mechanism 4, the cleaning mechanism 6 cleans the pipe, so that all the liquid medium remaining in the input pipe 21, the sealing cavity 12 and the output pipe 22 flows back into the heat medium mechanism 3 or the cooling medium mechanism 4. The cleaning method is the same in both cases. The following explanation takes the cleaning after the temperature is controlled by the heat medium mechanism 3 as an example.

[0050] The cleaning mechanism 6 includes an air inlet pipe 61, a control valve 62, and an exhaust assembly 7. One end of the air inlet pipe 61 is fixedly installed on the input pipe 21 and located between the first three-way valve 51 and the machine body 1. An air inlet valve 63 for controlling opening and closing is fixedly installed on the air inlet pipe 61. The other end of the air inlet pipe 61 is connected to an external air source and is used to input inert gas. The control valve 62 is fixedly installed on the output pipe 22 near the return pipe 35, forming a temporary storage chamber 53 in the output pipe 22 for temporary storage of residual liquid medium. The exhaust assembly 7 is located on the output pipe 22 near the control valve 62. The exhaust assembly 7 is connected to the temporary storage chamber 53 and is used to block liquid and allow gas to pass through, so that the residual liquid remains in the temporary storage chamber 53.

[0051] When cleaning is required, the control component 5 controls the inflow pipe 34 and the input pipe 21 to disconnect, while the return pipe 35 and the output pipe 22 remain connected. The inlet valve 63 is opened, and the inert gas enters the sealed cavity 12 through the inlet pipe 61 and the input pipe 21. Then, the inert gas is discharged through the output pipe 22 and the discharge component 7 for recycling. The liquid in the inert gas has been removed, which facilitates the direct recycling of the inert gas. The movement of the inert gas pushes the liquid medium to the temporary storage cavity 53 for temporary storage. When cleaning is completed, the control valve 62 is opened, and the medium in the temporary storage cavity 53 flows into the expansion buffer tank 31 for recycling under the action of gravity.

[0052] When the heating medium mechanism 3 or cooling medium mechanism 4 inputs the medium for temperature control, the control valve 62 is closed first. The inert gas input during the input medium and used to push the cleaning process is discharged through the discharge assembly 7. Then the control valve 62 is opened to allow the medium to flow normally. The discharged inert gas can be recycled. If the discharged gas is air, it is directly discharged into the external environment.

[0053] The discharge assembly 7 includes a discharge pipe 71, a recovery pipe 72, and a waterproof and breathable membrane 73. The bottom end of the discharge pipe 71 is fixedly installed on the end of the output pipe 22 near the control valve 62 and communicates with the temporary storage chamber 53. The top end of the discharge pipe 71 is inclined upward. The recovery pipe 72 is detachably installed on the top end of the discharge pipe 71 through a flange, screw, and nut. The recovery pipe 72 is used to output inert gas and recover the output inert gas. The discharge pipe 71 and the recovery pipe 72 have mounting grooves on their respective ends. The waterproof and breathable membrane 73 is snapped onto the two mounting grooves. The waterproof and breathable membrane 73 can be replaced after the recovery pipe 72 is removed from the discharge pipe 71. The waterproof and breathable membrane 73 is used to block liquid from passing through and allow gas to pass through, so that the inert gas is discharged, while the liquid medium is blocked and accumulates. The accumulated liquid medium flows back into the temporary storage chamber 53 for storage under the action of gravity through the discharge pipe 71.

[0054] The working principle of this application embodiment is as follows: The detection element 23 detects the temperature inside the sealed cavity 12. When the temperature inside the sealed cavity 12 is lower than K1, the control box controls the heat medium mechanism 3 to disconnect from the input pipe 21 and connect to the output pipe 22. The control valve 62 is closed first, and the heated medium enters the sealed cavity 12 through the input pipe 21. When the medium enters, it pushes the gas to be discharged through the discharge assembly 7. Then the control valve 62 is opened, and the medium flows back through the output pipe 22 and the return pipe 35, thereby enabling the control of the temperature inside the sealed cavity 12 to heat the sealed cavity 12.

[0055] If the detection element 23 detects that the temperature inside the sealed cavity 12 is higher than K2, the cooling medium needs to be replaced for cooling. First, the residual liquid medium is cleaned up. The control box controls the heat medium mechanism 3 to disconnect from the input pipe 21 and connect to the output pipe 22. The air inlet valve 63 is opened, and inert gas enters to push the liquid medium to the temporary storage cavity 53 for temporary storage. The inert gas is discharged through the discharge component 7 for recycling. After cleaning is completed, the air inlet valve 63 is closed, the control valve 62 is opened, and the liquid medium in the temporary storage cavity 53 flows back to the heat medium mechanism 3 through the output pipe 22 for recycling, thereby realizing the cleaning and recycling of the residual medium.

[0056] The control box controls the cooling medium mechanism 4 to disconnect from the input pipe 21 and connect to the output pipe 22. Then, the cooling medium is input into the sealing cavity 12 for cooling. The cooling medium then flows back through the output pipe 22, thereby cooling the sealing cavity 12. If the detection element 23 detects that the temperature inside the sealing cavity 12 is lower than K1, the control box controls the cooling medium mechanism 4 to disconnect from the input pipe 21 and connect to the output pipe 22. Then, cleaning is performed, so that the residual medium flows back to the cooling medium mechanism 4 and is then heated by the heat medium mechanism 3. This ensures that the temperature inside the sealing cavity 12 is within the appropriate temperature range of the dry gas sealing structure 11, so that the temperature inside the sealing cavity 12 can still be well controlled under ultra-wide temperature range conditions, thus improving the sealing effect of the dry gas sealing structure 11.

[0057] This application discloses a temperature control method adapted to extreme temperature conditions.

[0058] Reference Figures 1-3 A temperature control method adapted to extreme temperature conditions includes the following steps: Temperature detection: Detector 23 detects the temperature inside the sealed cavity 12; Temperature control: If the detected temperature is lower than the specified temperature, the specified temperature is K1. The specified temperature can also be designed according to the actual working conditions. The control component 5 controls the heat medium mechanism 3 to connect with the input pipe 21 and the output pipe 22. The heat medium flows back through the input pipe 21, the sealed cavity 12 and the output pipe 22 to heat the sealed cavity 12. If the detected temperature is higher than the specified temperature, the specified temperature is K2. The specified temperature can also be designed according to the actual working conditions. The control component 5 controls the cooling medium mechanism 4 to connect with the input pipe 21 and the output pipe 22. The cooling medium flows back through the input pipe 21, the sealing cavity 12 and the output pipe 22 to cool the sealing cavity 12 and keep the temperature in the sealing cavity 12 between K1 and K2. Cleaning: Before changing to a different medium, the residual medium in the input pipe 21, sealing cavity 12 and output pipe 22 is cleaned by the cleaning mechanism 6.

[0059] The cleaning process includes the following steps: The cleaning steps for the heat medium mechanism 3 and the cooling medium mechanism 4 are the same. The following explanation will take the cleaning step of the heat medium mechanism 3 after temperature control as an example. The heat medium mechanism 3 is disconnected from the input pipe 21 and connected to the output pipe 22. The control valve 62 is closed and the inlet valve 63 is opened. Inert gas enters and pushes the residual medium to be stored in the temporary storage chamber 53. The inert gas is discharged through the discharge component 7 for recycling. After cleaning, the inlet valve 63 is closed and the heat medium mechanism 3 is connected to the output pipe 22, so that the liquid medium is moved into the heat medium mechanism 3 for recycling. The cleaning method for the cooling medium mechanism 4 is the same.

[0060] The working principle of this application embodiment is as follows: The detection component 23 detects the temperature inside the sealing cavity 12. If the detected temperature is lower than the specified temperature, the control component 5 controls the heat medium mechanism 3 to heat the sealing cavity 12. If the detected temperature is higher than the specified temperature, the control component 5 controls the cooling medium mechanism 4 to cool the sealing cavity 12, so that the temperature inside the sealing cavity 12 is maintained between K1 and K2. Before changing to a different medium, the residual medium in the input pipe 21, the sealing cavity 12 and the output pipe 22 is cleaned by the cleaning mechanism 6, so that the temperature of the sealing ring can be controlled better and faster even in an ultra-wide temperature range, thereby improving the sealing effect of the dry gas sealing structure 11.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A dry gas seal system adapted for extreme temperature operating conditions, characterized by: The utility model relates to a temperature control device for a dry gas seal structure (11) of a machine body (1), comprising a sealing cavity (12) arranged on the machine body (1) and communicating with the dry gas seal structure (11), a temperature control device (2) comprising: an input pipe (21) and an output pipe (22) communicating with the sealing cavity (12) and used for inputting and outputting medium into the sealing cavity (12); a detection member (23) for detecting the temperature in the sealing cavity (12); a hot medium mechanism (3) and a cooling medium mechanism (4) communicating with the input pipe (21) and the output pipe (22) through a control assembly (5) and controlled by the control assembly (5) according to the temperature detected by the detection member (23); the control assembly (5) controls the hot medium mechanism (3) to communicate with the input pipe (21) and the output pipe (22) and input heating medium into the sealing cavity (12) for heating and then output, or the control assembly (5) controls the cooling medium mechanism (4) to communicate with the input pipe (21) and the output pipe (22) and input cooling medium into the sealing cavity (12) for cooling and then output.

2. A dry gas seal system adapted for extreme temperature operating conditions as claimed in claim 1, wherein: The sealing cavity (12) is annular and forms a spiral flow channel, and the medium entering the sealing cavity (12) forms a temperature field isolation exchange area in cooperation with the dry gas seal structure (11).

3. A dry gas seal system adapted for extreme temperature operating conditions as in claim 1, wherein: The medium input into the sealing cavity (12) is liquid medium.

4. A dry gas seal system adapted for extreme temperature operating conditions as claimed in claim 3, wherein: The utility model further comprises a cleaning mechanism (6) for cleaning the input pipe (21), the sealing cavity (12) and the output pipe (22), the cleaning mechanism (6) comprising: an air inlet pipe (61) communicating with the input pipe (21) and provided with an air inlet valve (63) and used for inputting inert gas into the input pipe (21); when cleaning is needed, the control assembly (5) is started to make the hot medium mechanism (3) disconnect with the input pipe (21) and communicate with the output pipe (22) and make the air inlet pipe (61) communicate with the input pipe (21); a control valve (62) arranged on the output pipe (22) and making the output pipe (22) form a temporary storage cavity (53) for temporarily storing residual liquid; a discharge assembly (7) arranged on the output pipe (22) and communicating with the temporary storage cavity (53) and used for blocking liquid and allowing gas to pass through, so that the residual liquid stays in the temporary storage cavity (53); when cleaning is completed, the control valve (62) is opened and the medium in the temporary storage cavity (53) flows into the hot medium mechanism (3) for recovery.

5. A dry gas seal system adapted for extreme temperature service conditions as claimed in claim 4 wherein: The discharge assembly (7) comprises: a discharge pipe (71) arranged on the output pipe (22) and communicating with the temporary storage cavity (53) and arranged upwardly and obliquely; a recovery pipe (72) detachably arranged on the top end of the discharge pipe (71) and used for recovering inert gas; a waterproof and air-permeable film (73) arranged at the connection between the discharge pipe (71) and the recovery pipe (72) and used for blocking liquid and allowing gas to pass through.

6. A dry gas seal system adapted for extreme temperature service conditions as claimed in claim 4 wherein: When the hot medium mechanism (3) or the cooling medium mechanism (4) inputs medium, the control valve (62) is first closed and the input medium pushes the inert gas input during cleaning to pass through the discharge assembly (7) to discharge gas, and then the control valve (62) is opened and the medium normally flows.

7. A dry gas seal system adapted for extreme temperature conditions as in claim 1, wherein: The heat medium mechanism (3) delivers heat-resistant synthetic oil, and the cooling medium mechanism (4) delivers alcohol-based solution.

8. A dry gas seal system adapted for extreme temperature service conditions as in claim 1, wherein: The control assembly (5) comprises: a first three-way valve (51) in communication with the heat medium mechanism (3), the cooling medium mechanism (4) and the input pipe (21); a second three-way valve (52) in communication with the heat medium mechanism (3), the cooling medium mechanism (4) and the output pipe (22), so that the heat medium mechanism (3) is in communication with the input pipe (21) and the output pipe (22), or the cooling medium mechanism (4) is in communication with the input pipe (21) and the output pipe (22).

9. A dry gas seal system adapted for extreme temperature service conditions as in claim 1, wherein: The heat medium mechanism (3) comprises: an expansion buffer tank (31) containing medium for heating; a heater (32) for heating the medium in the expansion buffer tank (31); a high-temperature pump (33) arranged on the expansion buffer tank (31); an inflow pipe (34) and a return pipe (35) arranged on the high-temperature pump (33) and the expansion buffer tank (31) and connected to the control assembly (5) at the input pipe (21) and the output pipe (22) respectively.

10. A temperature control method for the dry gas seal system as claimed in claim 4, wherein: The method comprises the following steps: temperature detection: the detection member (23) detects the temperature in the sealed cavity (12); temperature control: if the detected temperature is less than the specified temperature, the control assembly (5) controls the heat medium mechanism (3) to be in communication with the input pipe (21) and the output pipe (22), and the heat medium flows through the input pipe (21), the sealed cavity (12) and the output pipe (22) to return, so as to heat the sealed cavity (12); if the detected temperature is greater than the specified temperature, the control assembly (5) controls the cooling medium mechanism (4) to be in communication with the input pipe (21) and the output pipe (22), and the cooling medium flows through the input pipe (21), the sealed cavity (12) and the output pipe (22) to return, so as to cool the sealed cavity (12) and maintain the temperature in the sealed cavity (12) within a suitable temperature range; cleaning: before changing different media, the residual medium in the input pipe (21), the sealed cavity (12) and the output pipe (22) is cleaned by the cleaning mechanism (6).

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