A high-temperature double-suction centrifugal pump combined flushing structure

Abstract

This invention relates to the field of pump equipment technology, specifically to a high-temperature dual-suction centrifugal pump combined flushing structure, comprising: a dual-suction centrifugal pump, connected to a sealed cavity and a drive component; a first cyclone self-cleaning heat exchanger and a second cyclone self-cleaning heat exchanger, respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; a first liquid storage tank and a second liquid storage tank, respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; and a level gauge, a pressure detection element, and a thermometer, all mounted on the first and second liquid storage tanks. By integrating a self-cleaning structure that utilizes the kinetic energy of the flushing fluid to continuously peel off polymer deposits on the pipe wall, an anti-clogging cooling flow channel with online self-sustaining capability is established, fundamentally eliminating the flushing flow rate attenuation problem caused by localized cooling and coking of aromatics, ensuring that the inner mechanical seal always receives stable and sufficient cooling and lubrication throughout the entire operating cycle.

Description

Technical Field

[0001] This invention relates to the field of pump equipment technology, specifically to a high-temperature double-suction centrifugal pump combined flushing structure. Background Technology

[0002] High-temperature centrifugal pumps are widely used in high-temperature environments such as petroleum, chemical, and metallurgical industries. The high temperature of the transported medium places extremely high demands on the reliability of the mechanical seal. Traditional single-mode mechanical seal auxiliary solutions struggle to balance cooling effectiveness and economy. For example, using the Plan 23 self-circulating flushing system alone can lead to seal failure when the medium temperature is too high or the heat load exceeds the cooling capacity, as the sealing cavity is prone to overheating and the medium is prone to vaporization. The Plan 52 pressureless double-end face system, primarily for safety isolation, does not rely on the process medium's self-circulation for cooling the main seal, resulting in limited cooling capacity under extremely high-temperature conditions.

[0003] In existing technologies, Plan 23 circulating cooling scheme is usually adopted to reduce the temperature of the sealing cavity and improve the sealing reliability under high temperature medium conditions. However, high temperature aromatics are extremely heat-sensitive. When they flow through the heat exchanger tube wall, they will undergo thermal polymerization reaction once they encounter local cold spots, generating high molecular solid particles or colloidal coke. These polymers will gradually deposit and adhere to the inner wall of the coil, elbows and small flushing channels of the sealing cavity as the medium flows. Once the deposit layer is formed, it will continue to accumulate and irreversibly reduce the effective flow area, eventually causing the flushing flow rate to decrease below the safety threshold. The mechanical seal will quickly overheat and fail due to insufficient cooling.

[0004] In existing double-suction centrifugal pumps, the mechanical seals at both ends are usually arranged symmetrically and share the same common liquid supply and cooling unit of the same seal auxiliary flushing system. This makes it impossible to independently control the flow rate, pressure, and temperature according to the actual operating conditions of the left and right sealing chambers. When there are differences in the operating conditions on both sides, it can easily lead to problems such as uneven temperature, pressure imbalance, and axial thermal deformation in the left and right sealing chambers, further affecting the fit of the mechanical seal end faces and the overall operational stability of the pump.

[0005] Even with the introduction of the Plan52 external pressureless buffer system to form an isolation barrier, existing combined auxiliary systems typically still rely primarily on conventional instruments such as buffer tank level, pressure, or temperature for leak detection. When a minor leak occurs in the inner mechanical seal, the leaked high-temperature aromatics may first enter the Plan52 buffer chamber and gradually accumulate there. Since conventional level or pressure detection usually requires reaching a certain threshold to trigger an alarm, the system's real-time detection capability for minor leaks is limited in the initial stages. This can lead to the localized accumulation of high-temperature aromatics within the buffer chamber, which then diffuses towards the outer sealing area, affecting buffer stability and the operational safety of the outer seal. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the reliability problems of Plan23 cooling circuit being blocked due to medium coking and Plan52 system being passively delayed in response to micro-leakage in the prior art, thereby providing a high-temperature double-suction centrifugal pump combined flushing structure.

[0007] To address the aforementioned technical problems, this invention provides a high-temperature dual-suction centrifugal pump combined flushing structure, comprising: a dual-suction centrifugal pump, connected to a sealed cavity and a drive component; a first cyclone self-cleaning heat exchanger and a second cyclone self-cleaning heat exchanger, respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; a first liquid storage tank and a second liquid storage tank, respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; and a level gauge, a pressure detection element, and a thermometer, all mounted on the first and second liquid storage tanks.

[0008] Furthermore, the first and second liquid storage tanks are respectively equipped with liquid level detection elements.

[0009] Furthermore, gas detectors are respectively installed on the first and second liquid storage tanks.

[0010] Furthermore, the gas detector is equipped with an exhaust valve on the connecting pipes to the first liquid storage tank and the second liquid storage tank, respectively.

[0011] Furthermore, the first and second liquid storage tanks are equipped with liquid filling ports.

[0012] Furthermore, flow electric valves are installed on the connecting pipes of the cooling water outlet and cooling water inlet, the first vortex self-cleaning heat exchanger, and the second vortex self-cleaning heat exchanger.

[0013] Furthermore, the cooling water outlet pipeline and the connecting pipeline between the cooling water outlet and the first and second liquid storage tanks are respectively equipped with an electric inlet valve.

[0014] Furthermore, the double-suction centrifugal pump is connected to the medium inlet and the medium outlet, and a medium electric valve is provided on the connecting pipeline between the double-suction centrifugal pump and the medium inlet and the medium outlet.

[0015] Furthermore, it also includes a controller, which is connected to a first cyclone self-cleaning heat exchanger, a second cyclone self-cleaning heat exchanger, a level gauge, a pressure sensing element, a thermometer, a level sensing element, and a gas detector.

[0016] Furthermore, the driving component is a motor.

[0017] The technical solution of this invention has the following advantages: 1. The high-temperature dual-suction centrifugal pump combined flushing structure provided by the present invention integrates a self-cleaning structure in the Plan23 circulating cooling circuit, which can continuously peel off polymer deposits on the pipe wall by utilizing the kinetic energy of the flushing fluid itself. This establishes an anti-clogging cooling channel with online self-sustaining capability, eliminating the problem of flushing flow rate attenuation caused by local temperature drop and coking of aromatics from the root, and ensuring that the inner mechanical seal always obtains stable and sufficient cooling and lubrication throughout the entire operating cycle.

[0018] To avoid mutual interference between the two seals when sharing an auxiliary system, and to improve the operational stability and safety of the sealing system under complex operating conditions, independent mechanical seals and auxiliary flushing circuits can separately cool, lubricate, regulate pressure, and monitor leaks in their respective sealing chambers. This prevents an abnormality in one seal from affecting the operation of the other seal through the shared circuit. It also facilitates fault location, leak warning, and online maintenance, further improving the overall reliability and sealing safety of the double-suction centrifugal pump under high-parameter, continuous operating conditions.

[0019] The Plan23 cooling circuit features a self-cleaning anti-deposition system. The integrated Plan23 cooling circuit utilizes high-temperature aromatics as the kinetic energy of the flushing fluid to strip polymer deposits from the pipe wall online. The swirling self-cleaning heat exchanger generates a continuous spiral scouring flow in the flow channel after cooling, preventing and removing aromatic polymers that adhere to the pipe wall due to localized overcooling.

[0020] This invention addresses the unique double-sided sealing structure of double-suction centrifugal pumps by providing independent cooling and flushing circuits on both sides. Cooling water circulates independently on each side, performing targeted and quantitative flushing, purification, and heat exchange to cool the sealing end face on the same side, and then returns through independent pipelines to form a closed loop. This symmetrical independent circuit architecture allows for individual adjustment and matching of the heat load on both sealing cavities—when one side experiences abnormal temperature rise due to operating condition fluctuations, it will not affect the cooling capacity of the other side, effectively avoiding rotor thermal deformation problems caused by excessive temperature differences between the two sealing ends in large pump units.

[0021] This invention employs a high-precision closed-loop control strategy, integrating multi-dimensional real-time monitoring instruments for flow rate, temperature, pressure, and liquid level into the Plan23 cooling loop and Plan52 system joint operation loop, and configuring automatic interlocking protection logic. The system not only continuously flushes and exchanges heat during normal operation, but also automatically triggers protection responses when it detects fault symptoms such as insufficient flow or abnormal temperature, ensuring uninterrupted flushing and cooling processes.

[0022] The summary section is provided to present the chosen concepts in a simplified form, which will be further described in the detailed description below. The summary section is not intended to identify essential or necessary features of this disclosure, nor is it intended to limit the scope of this disclosure. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 A schematic diagram of the high-temperature double-suction centrifugal pump combined flushing structure provided by the present invention.

[0025] Explanation of reference numerals in the attached figures: 1. Double-suction centrifugal pump; 2. Motor; 3. First cyclone self-cleaning heat exchanger; 4. Second cyclone self-cleaning heat exchanger; 5. First liquid inlet; 6. Second liquid inlet; 7. First liquid storage tank; 8. Second liquid storage tank; 9. First vent valve; 10. Second vent valve; 11. First flow regulating valve; 12. Second flow regulating valve; 13. First flow electric valve; 14. Second flow electric valve; 15. Third flow electric valve; 16. First water inlet electric valve; 17. First medium electric valve; 18. Second medium electric valve; 19. Second water inlet electric valve; 20. Fourth flow electric valve; 21. First liquid filling electric valve; 22. Second liquid filling electric valve; V. Gas detector; TI. Thermometer; PT. Pressure sensor; LI. Level gauge; LT. Level sensor. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this disclosure. Therefore, the drawings and description are to be considered exemplary in nature and not restrictive.

[0027] The preferred embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0028] Please see Figure 1As shown, the present invention provides a combined flushing structure for a high-temperature double-suction centrifugal pump 1, comprising: a double-suction centrifugal pump 1, which is connected to a sealed cavity and a drive component 2; a first cyclone self-cleaning heat exchanger 3 and a second cyclone self-cleaning heat exchanger 4, which are respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; a first liquid storage tank 7 and a second liquid storage tank 8, which are respectively connected to both ends of the sealed cavity, a cooling water inlet, and a cooling water outlet; and a level gauge LI, a pressure detection element, and a thermometer TI, all of which are mounted on the first liquid storage tank 7 and the second liquid storage tank 8.

[0029] The first swirling self-cleaning heat exchanger 3 and the second swirling self-cleaning heat exchanger 4, the cooling water inlet, the cooling water outlet, and the sealing cavity together form the Plan23 cooling circuit.

[0030] The first liquid storage tank 7 and the second liquid storage tank 8, the cooling water inlet, the cooling water outlet, and the sealed cavity together form the Plan 52 system.

[0031] The sealed cavity is connected to a double-suction centrifugal pump 1, allowing high-temperature aromatics to enter the sealed cavity via the pump. Simultaneously, the high-temperature aromatics in the sealed cavity enter the first cyclone self-cleaning heat exchanger 3 and the second cyclone self-cleaning heat exchanger 4, respectively. The high-temperature aromatics are then heated by the cooling water entering the first cyclone self-cleaning heat exchanger 3 and the second cyclone self-cleaning heat exchanger 4 from the cooling water outlet, and then flow back to the first cyclone self-cleaning heat exchanger 3 and the second cyclone self-cleaning heat exchanger 4. Since high-temperature aromatics may coke after cooling, the first cyclone self-cleaning heat exchanger 3 and the second cyclone self-cleaning heat exchanger 4 have a cyclone self-cleaning function to effectively solve the coking problem. Furthermore, the first cyclone self-cleaning heat exchanger 3 and the second cyclone self-cleaning heat exchanger 4 are provided with discharge ports (not shown in the figure) to discharge the coked high-temperature aromatics.

[0032] Since the two ends of the sealed cavity are connected to the first liquid storage tank 7 and the second liquid storage tank 8 respectively, when the high-temperature aromatic hydrocarbon in the sealed cavity enters the first liquid storage tank 7 or the second liquid storage tank 8, the level gauge LI detects the change in the liquid level in the first liquid storage tank 7 or the second liquid storage tank 8. Therefore, it can be determined that there is a leak in the sealed cavity, which is determined by the temperature sensor and the thermometer TI.

[0033] The Plan23 cooling circuit uses a swirl self-cleaning heat exchanger with a swirl self-cleaning structure. It uses the kinetic energy of the flushing fluid to continuously flush the tube wall, removing the polymer formed when aromatics are cooled and carrying it away with the flow. This eliminates the problem of reduced flow channel cross-section caused by local overcooling and coking at the source, ensuring that the flushing flow rate does not decrease throughout the entire operating cycle, so that the mechanical seal always receives stable cooling and lubrication.

[0034] The dual-suction pump features independent flushing adjustment for the left and right sealing chambers. Each sealing chamber is equipped with an independent flushing circuit combination unit. The controller collects temperature signals from each side and independently controls the opening and closing of the corresponding valves. This allows the left and right sealing chambers to adjust the flushing parameters according to their respective actual heat loads, thereby avoiding uneven temperature, pressure imbalance, and axial thermal deformation caused by uniform liquid supply and ensuring the operational stability of the entire sealing system.

[0035] Early detection is achieved through multi-sensor fusion, and the vacuum of manual response is eliminated through automatic pressure boosting and sealing. The Plan52 system integrates gas detector V, pressure detection element and liquid level detection element, and cross-confirms through multi-physical quantity fusion logic to achieve extremely early micro-leak detection with a low false alarm rate. Once a leak is determined, the entire detection process is completed within seconds, and an alarm is triggered in time so that personnel can carry out maintenance and prevent the possibility of the leaked medium spreading outward.

[0036] The first liquid storage tank 7 and the second liquid storage tank 8 are respectively equipped with liquid level detection elements. The liquid level detection elements and the liquid level gauge L1 work together to detect the liquid level in the first liquid storage tank 7 and the second liquid storage tank 8.

[0037] Gas detectors V are respectively installed on the first liquid storage tank 7 and the second liquid storage tank 8. Gas detectors V can effectively detect the characteristic signals of high-temperature aromatic volatiles.

[0038] Specifically, the gas detector V is equipped with exhaust valves on the connecting pipes to the first liquid storage tank 7 and the second liquid storage tank 8, respectively. That is, the gas detector V is equipped with a first exhaust valve 9 on the connecting pipe to the first liquid storage tank 7, and a second exhaust valve 10 on the connecting pipe to the second liquid storage tank 8.

[0039] The first storage tank 7 and the second storage tank 8 are provided with filling ports. Specifically, the first storage tank 7 is provided with a first filling port 5, and the second storage tank 8 is provided with a second filling port 6. Buffer solution, i.e., high-temperature aromatic hydrocarbons, can be added to the first storage tank 7 and the second storage tank 8 through the first filling port 5 and the second filling port 6.

[0040] Electric flow valves are installed on the connecting pipes of the cooling water outlet and cooling water inlet, the first swirling self-cleaning heat exchanger 3, and the second swirling self-cleaning heat exchanger 4.

[0041] A first flow electric valve 13 is installed on the cooling water inlet pipe, a second flow electric valve 14 is installed on the cooling water inlet pipe, a third flow electric valve 15 is installed on the cooling water outlet connecting to the inlet water of the first vortex self-cleaning heat exchanger 3, a first flow regulating valve 11 is installed on the cooling water outlet connecting to the outlet water of the first vortex self-cleaning heat exchanger 3, a fourth flow electric valve 20 is installed on the cooling water outlet connecting to the inlet water of the second vortex self-cleaning heat exchanger 4, and a second flow regulating valve 12 is installed on the cooling water outlet connecting to the outlet water of the second vortex self-cleaning heat exchanger 4.

[0042] The cooling water outlet pipeline and the connecting pipeline between the cooling water outlet and the first liquid storage tank 7 and the second liquid storage tank 8 are respectively equipped with an electric inlet valve.

[0043] A first electric inlet valve 16 is provided on the cooling water outlet pipe and the first liquid storage tank 7, and a second electric inlet valve 19 is provided on the cooling water outlet pipe and the second liquid storage tank 8.

[0044] The double-suction centrifugal pump 1 is connected to the medium inlet and the medium outlet, and a medium electric valve is provided on the connecting pipeline between the double-suction centrifugal pump 1 and the medium inlet and the medium outlet.

[0045] That is, a first electric valve 17 is provided on the connecting pipeline between the double-suction centrifugal pump 1 and the medium inlet, and a second electric valve 18 is provided on the connecting pipeline between the double-suction centrifugal pump 1 and the medium outlet.

[0046] The high-temperature double-suction centrifugal pump 1 combined flushing structure also includes a controller, which is connected to the first cyclone self-cleaning heat exchanger 3, the second cyclone self-cleaning heat exchanger 4, the level gauge LI, the pressure detection element, the thermometer TI, the level detection element, and the gas detector V.

[0047] Meanwhile, the controller is also connected to various exhaust valves, flow regulating valves, flow electric valves, medium electric valves, water inlet electric valves, and liquid filling electric valves.

[0048] In this embodiment, the driving component 2 is a motor.

[0049] The specific working process of the combined flushing structure of the high-temperature double-suction centrifugal pump 1 is as follows: When the double-suction centrifugal pump 1 is ready to start, the starting drive unit 2 drives the double-suction centrifugal pump 1 to run. The first medium electric valve 17 slowly opens, and the process medium high-temperature aromatic hydrocarbons enter the pump cavity and fill the pump body and impeller (the internal structure of the double-suction centrifugal pump 1) channels. At the same time, the second medium electric valve 18 is partially opened to ensure that the high-temperature aromatic hydrocarbons can be discharged smoothly, remove residual air from the pump cavity and suction pipeline, and avoid cavitation during startup.

[0050] Open the first liquid filling electric valve 21 and the second liquid filling electric valve 22, and inject suitable buffer solution into the first liquid storage tank 7 through the first liquid filling port 5 and into the second liquid storage tank 8 through the second liquid filling port 6. Confirm that the first vent valve 9 and the second vent valve 10 on the top of the storage tanks are open. During this process, open the first flow electric valve 13 and the second flow electric valve 14, and cooling water flows through the pipeline into the first vortex self-cleaning heat exchanger 3, the second vortex self-cleaning heat exchanger 4, the first liquid storage tank 7, and the second liquid storage tank 8. Adjust the flow rate of the cooling water added to the heat exchangers by regulating the first flow regulating valve 11 and the second flow regulating valve 12, cooling and exchanging heat with the working medium drawn from the sealed cavity. The cooled working medium returns to the sealed cavity, and the cooling medium returns to the cooling water outlet, forming a closed-loop cycle. The vortex self-cleaning heat exchanger utilizes its vortex structure... The rinsing fluid itself generates a spiral scouring flow pattern, continuously stripping away and carrying away aromatic polymers formed on the pipe wall due to localized supercooling. These polymers are then flushed back into the sealing cavity with the main flow, achieving online self-cleaning of the circulation pipeline without the need for an external power source. The temperature at the cooling circuit in Plan 23 is monitored, and the first flow regulating valve 11 and the second flow regulating valve 12 at the cooling water inlet are adjusted to ensure the sealing end face temperature remains within the set range. Simultaneously, the cooling water pipeline cools the buffer solution storage tank, carrying away heat and lowering the buffer solution temperature. The buffer solution in Plan 52 enters the sealing cavity from the first storage tank 7 and the second storage tank 8, forming an isolation liquid layer. After absorbing heat, the buffer solution flows back to the storage tank. The dual-suction pump has independent circulation in the left and right sealing cavities, ensuring temperature and pressure balance on both sides without interference.

[0051] After the double-suction centrifugal pump 1 is officially started, the impeller of the double-suction centrifugal pump 1 rotates, driving the flow of high-temperature aromatics. At the same time, the Plan 23 cooling circuit and the Plan 52 system continue to operate. At this time, the second medium electric valve 18 gradually opens to the required opening degree of the process, and the first medium electric valve 17 is fully open to ensure stable flow of high-temperature aromatics. When a micro-leakage of high-temperature aromatics from the sealed cavity to the buffer cavity occurs, the gas detector V will capture the characteristic signal of the aromatic volatiles. At the same time, the pressure detection element detects the instantaneous rise in cavity pressure, and the liquid level detection element detects the abnormal slow rise trend of liquid level. After receiving the gas characteristic signal and at least one abnormal pressure or liquid level confirmation signal at the same time, the controller determines that a micro-leakage has occurred in the inner seal, immediately alarms, and the staff immediately carries out maintenance.

[0052] Throughout the process, monitoring instruments include thermometer TI, pressure sensing element, level gauge LI, and level sensing element, and provide real-time status feedback. When insufficient flow or abnormal temperature occurs, interlock protection automatically responds to ensure uninterrupted flushing and cooling processes.

[0053] The pressure detection element is a pressure sensor PT, and the liquid level detection element is a liquid level sensor LT.

[0054] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A high temperature double suction centrifugal pump (1) combined flushing structure, characterized in that, include: A double-suction centrifugal pump (1) is connected to the sealed cavity and to the drive unit (2); The first swirling self-cleaning heat exchanger (3) and the second swirling self-cleaning heat exchanger (4) are respectively connected to the two ends of the sealed cavity, the cooling water inlet and the cooling water outlet; The first liquid storage tank (7) and the second liquid storage tank (8) are respectively connected to the two ends of the sealed cavity, the cooling water inlet and the cooling water outlet; The level gauge (LI), pressure sensing element, and thermometer (TI) are all installed on the first liquid storage tank (7) and the second liquid storage tank (8).

2. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 1, characterized in that, The first liquid storage tank (7) and the second liquid storage tank (8) are respectively equipped with liquid level detection elements.

3. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 2, characterized in that, Gas detectors (V) are respectively installed on the first liquid storage tank (7) and the second liquid storage tank (8).

4. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 3, characterized in that, The gas detector (V) is equipped with an exhaust valve on the connecting pipes to the first liquid storage tank (7) and the second liquid storage tank (8).

5. A combined flushing structure for a high-temperature double-suction centrifugal pump (1) according to any one of claims 1-4, characterized in that, The first liquid storage tank (7) and the second liquid storage tank (8) are provided with liquid filling ports.

6. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 5, characterized in that, The cooling water outlet and cooling water inlet, the first swirling self-cleaning heat exchanger (3), and the second swirling self-cleaning heat exchanger (4) are all equipped with flow electric valves.

7. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 6, characterized in that, The cooling water outlet pipeline and the connecting pipeline between the cooling water outlet and the first liquid storage tank (7) and the second liquid storage tank (8) are respectively equipped with an electric inlet valve.

8. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 1, characterized in that, The double-suction centrifugal pump (1) is connected to the medium inlet and the medium outlet, and a medium electric valve is provided on the connecting pipeline between the double-suction centrifugal pump (1) and the medium inlet and the medium outlet.

9. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 1, characterized in that, It also includes a controller, which is connected to a first swirling self-cleaning heat exchanger (3), a second swirling self-cleaning heat exchanger (4), a level gauge (LI), a pressure sensing element, a thermometer (TI), a level sensing element, and a gas detector (V).

10. The combined flushing structure of a high-temperature double-suction centrifugal pump (1) according to claim 1, characterized in that, The driving component (2) is a motor.

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