A booster pump bearing flushing structure and centrifugal low-temperature booster pump

Abstract

The application discloses a kind of booster pump bearing flushing structure and centrifugal low-temperature booster pump, wherein the booster pump bearing flushing structure includes flushing column, flushing adjusting part, elastic member and flushing cover shell, retractable groove and liquid outlet passage are opened in flushing column, liquid outlet passage is communicated with the groove bottom of retractable groove, the side wall of flushing column is opened with several groups adjusting flow hole and fixed flow hole, adjusting protrusion of flushing adjusting part is opened with retractable groove, elastic member is sleeved on flushing column, and flushing cover shell is opened with movable groove in, and the groove bottom of movable groove is opened with liquid inlet hole, flushing column and flushing adjusting part are correspondingly arranged in movable groove, and flushing cover shell is connected with flushing column, the application can adjust the flushing flow and flushing pressure of pump bearing according to the change of pump outlet pressure, to avoid the damage of high-pressure liquid to pump bearing during flushing.

Description

Technical Field

[0001] This invention relates to the field of centrifugal pump technology, and further to a booster pump bearing flushing structure and a centrifugal cryogenic booster pump. Background Technology

[0002] A centrifugal cryogenic booster pump is a multi-stage pump that is electromechanically integrated and operates submerged in cryogenic liquids. It belongs to the category of centrifugal pumps. The motor drives the shaft to rotate, and the shaft in turn drives the impeller to rotate. The centrifugal force of the impeller is used to do work on the liquid to achieve the purpose of pressurizing and transporting the liquid.

[0003] The centrifugal cryogenic booster pump is mainly a vertical multistage submersible pump. It is used in the regasification system of floating storage and regasification units. The main function of this pump is to pressurize liquid LNG. The pressurized liquid LNG is then vaporized through a high-pressure vaporizer and enters onshore gas users or municipal natural gas pipelines.

[0004] Most existing centrifugal cryogenic booster pumps have a throttling orifice at the pump outlet flange. A portion of the liquid at the pump outlet flows through the orifice to the bearing for cooling and lubrication. Since centrifugal cryogenic booster pumps are mostly driven by variable frequency motors, the pressure at the pump outlet is high when the motor frequency is high. This high pressure, after passing through the throttling orifice, causes the high-pressure liquid to flush the bearing, damaging it and reducing the pump's lifespan. Simultaneously, higher pump outlet pressures increase leakage at the throttling orifice, leading to reduced pump efficiency. Summary of the Invention

[0005] In view of the above-mentioned technical problems, the purpose of this invention is to provide a booster pump bearing flushing structure to solve the problems mentioned in the background art. Another purpose of this invention is to provide a centrifugal cryogenic booster pump.

[0006] To achieve the above objectives, the present invention provides a booster pump bearing flushing structure, comprising:

[0007] A flushing column, one end of which has a telescopic groove and the other end of which has a liquid outlet channel, the liquid outlet channel being connected to the bottom of the telescopic groove. Several sets of adjusting drain holes are provided on the side wall of the flushing column near the telescopic groove, the adjusting drain holes being connected to the telescopic groove.

[0008] A flushing adjustment component, one end of which has an adjustment protrusion adapted to the telescopic groove, the adjustment protrusion being slidably inserted into the telescopic groove;

[0009] An elastic element, which is sleeved on the flushing column;

[0010] The flushing cover has a movable groove inside, and a liquid inlet hole is correspondingly opened at the bottom of the movable groove. The flushing column and the flushing adjustment component are respectively arranged in the movable groove, and the flushing cover is correspondingly connected to the flushing column.

[0011] In some embodiments, in the free state, one end of the elastic member abuts against the flushing column, and the other end of the elastic member abuts against the flushing adjustment member, so that the length of the adjustment protrusion extending into the telescopic groove is less than the distance between the adjustment drain hole and the opening of the telescopic groove.

[0012] In some embodiments, a fixed drain hole is provided on the side wall of the flushing column near the liquid outlet channel, and the fixed drain hole is connected to the liquid outlet channel.

[0013] By opening fixed drainage holes on the side wall of the flushing column, the structure provided in this application ensures that liquid can flow to the bearing under any circumstances to cool and lubricate the bearing.

[0014] In some embodiments, the number of the regulating drain holes is two sets, and the two sets of regulating drain holes are sequentially opened along the length direction of the expansion groove.

[0015] By sequentially opening adjustment drain holes along the length of the expansion groove, the number of adjustment drain holes used on the flushing column can be adjusted by controlling the length of the adjustment protrusion in the expansion groove, thereby achieving the effect of adjusting the bearing flushing flow rate and flushing pressure.

[0016] In some embodiments, the booster pump bearing flushing structure provided by the present invention further includes:

[0017] A sliding bearing is provided in the telescopic groove by means of a fixing member, and the adjusting protrusion can be slidably inserted into the sliding bearing.

[0018] By installing a sliding bearing between the flushing column and the flushing adjustment component, damage to the equipment caused by friction between metals is effectively avoided, thereby improving the service life of the flushing structure.

[0019] In some embodiments, a pressure-reducing block is provided at one end of the flushing adjustment member away from the adjustment protrusion. The pressure-reducing block is adapted to the movable groove, and a flow gap is left between the pressure-reducing block and the groove wall of the movable groove.

[0020] In some embodiments, the pressure relief block has a plurality of pressure relief grooves on one side corresponding to the flow gap.

[0021] By opening multiple pressure relief grooves on the side of the pressure reducing block, the pressure reduction of the liquid when passing through the flushing regulating component is increased, thereby increasing the pressure difference between the upper and lower end faces of the pressure reducing block, and thus making pressure regulation more flexible.

[0022] In some embodiments, a connecting block is provided at one end of the flushing column away from the pressure reducing block, and the connecting block is connected to the flushing hood via a connecting member.

[0023] By connecting the flushing hood with the connecting block, the movable tank becomes a sealed structure, and the flushing hood, flushing adjustment components and flushing column become a tightly integrated whole, effectively improving the reliability of the structure.

[0024] In some embodiments, a seal is sandwiched between the connecting block and the flushing hood.

[0025] Liquid leakage is prevented by sealing the connection block with a copper gasket between the connection block and the flushing hood.

[0026] According to another aspect of the present invention, the present invention further provides a centrifugal cryogenic booster pump, comprising:

[0027] The main bearing and the booster pump bearing flushing structure described in any of the above embodiments, wherein the liquid outlet channel of the booster pump bearing flushing structure is correspondingly connected to the main bearing.

[0028] Compared with the prior art, the booster pump bearing flushing structure provided by the present invention has the following beneficial effects:

[0029] 1. The booster pump bearing flushing structure provided by this invention allows the flushing adjustment component to be slidably inserted into the flushing column. Through a drain hole, it works in conjunction with the flushing adjustment component and the elastic component, enabling adjustment of the flushing flow rate and flushing pressure of the pump bearing according to changes in the pump outlet pressure. This avoids damage to the pump bearing caused by high-pressure liquid during flushing, thereby improving the pump's service life. Simultaneously, it prevents a decrease in pump efficiency due to excessive flushing flow. The entire solution has the advantages of complete overall design functions, convenient assembly and operation, and ensures stable and reliable operation during work.

[0030] 2. The booster pump bearing flushing structure provided by the present invention, by installing a sliding bearing between the flushing column and the flushing adjustment component, prevents friction between metals from causing equipment damage, thereby improving the service life of the flushing structure. Attached Figure Description

[0031] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0032] Figure 1 This is a cross-sectional schematic diagram of the flushing structure of the booster pump bearing according to a preferred embodiment of the present invention.

[0033] Explanation of icon numbers:

[0034] The components include: flushing column 10, fixed drain hole 11, adjustable drain hole 12, telescopic groove 13, liquid outlet channel 14, connecting block 15, flushing adjustment component 20, adjustment protrusion 21, pressure relief groove 22, pressure reducing block 23, flushing cover 30, liquid inlet hole 31, movable groove 32, elastic component 40, sliding bearing 50, fixing component 51, sealing component 60, and connecting component 70. Detailed Implementation

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0036] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0037] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In one embodiment, refer to the appendix to the specification. Figure 1The present invention provides a flushing structure for a booster pump bearing, comprising a flushing column 10, a flushing adjustment component 20, a flushing cover 30, and an elastic component 40. One end of the flushing column 10 has a telescopic groove 13, and the other end has a liquid outlet channel 14, which is connected to the bottom of the telescopic groove 13. The end of the flushing column 10 near the telescopic groove 13 is the upper part of the flushing column, and the end near the liquid outlet channel 14 is the lower part. Several sets of adjusting drain holes 12 are provided on the side wall of the upper part of the flushing column 10, and the adjusting drain holes 12 are connected to the telescopic groove 13. The trough 13 is connected to the rinsing column 10. A fixed drain hole 11 is provided on the lower side wall of the rinsing column 10. The fixed drain hole 11 is connected to the liquid outlet channel 14. One end of the rinsing adjustment component 20 is provided with an adjustment protrusion 21 that is adapted to the telescopic trough 13. The adjustment protrusion 21 is slidably inserted into the telescopic trough 13. The elastic component 40 is sleeved on the rinsing column 10. A movable trough 32 is provided in the rinsing cover 30. A liquid inlet hole 31 is provided at the bottom of the movable trough 32. The rinsing column 10 and the rinsing adjustment component 20 are respectively set in the movable trough 32. The rinsing cover 30 is correspondingly connected to the rinsing column 10.

[0040] Specifically, the flushing column 10 is cylindrical, with one end hollow to form a telescopic groove 13, and the other end having a liquid outlet channel 14 communicating with the bottom of the telescopic groove 13. Several sets of adjusting drain holes 12 corresponding to and communicating with the telescopic groove 13 are provided on the upper sidewall of the flushing column 10, allowing liquid to flow into the telescopic groove 13 through the adjusting drain holes 12, and then flow through the liquid outlet channel 14 to the pump bearing. The adjusting protrusion 21 of the flushing adjusting component 20 is rod-shaped, and the rod-shaped adjusting protrusion 21 can be telescopically inserted into the telescopic groove 13 to adjust the drain hole... 12 can adjust the number and degree of opening according to the length of the adjusting protrusion 21 in the telescopic groove 13, thereby achieving the purpose of controlling the total flow of liquid to the bearing. The flushing cover 30 is sleeved on the periphery of the flushing adjustment member 20, and under the dividing action of the flushing adjustment member 20, the space in the movable groove 32 is divided into an upper chamber and a lower chamber. The size of the upper chamber and the lower chamber changes with the position of the flushing adjustment member 20. In addition, a gap is formed between the flushing adjustment member 20 and the flushing cover 30 to allow liquid to flow from the upper chamber to the lower chamber.

[0041] During operation, the liquid in the upper chamber flows to the lower chamber through the gap. The decrease in liquid pressure during this flow creates a pressure difference between the upper and lower chambers. This pressure difference pushes the flushing regulating component 20 downwards. As the flushing regulating component 20 moves downwards, the elastic component 40 deforms, generating an upward elastic force on the flushing regulating component 20, which balances the pressure difference between the liquids in the upper and lower chambers. The liquid in the lower chamber enters the expansion groove 13 within the flushing column 10 through the regulating drain hole 12, and then is transported to the bearing for cooling and lubrication through the liquid outlet channel 14. When the liquid pressure changes, the pressure difference between the upper and lower chambers changes, the elastic force of the elastic component 40 changes, and the deformation of the elastic component 40 changes accordingly. This, in turn, changes the equilibrium position of the flushing regulating component 20, thereby altering the number of drain holes used on the flushing column 10, and ultimately regulating the flushing flow rate and flushing pressure of the bearing.

[0042] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiments, in the free state, one end of the elastic member 40 abuts against the flushing column 10, and the other end of the elastic member 40 abuts against the flushing adjustment member 20, so that the length of the adjustment protrusion 21 extending into the telescopic groove 13 is less than the distance between the adjustment drain hole 12 and the opening of the telescopic groove 13.

[0043] Specifically, the elastic element 40 is a spring, and springs with different stiffness coefficients can be selected according to different usage environments, thereby achieving the purpose of changing and adjusting different rinsing effects.

[0044] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiment, a fixed drain hole 11 is provided on the side wall of the lower part of the flushing column 10, and the fixed drain hole 11 is connected to the liquid outlet channel 14.

[0045] Specifically, by providing a fixed drain hole 11, the structure provided in this application ensures that liquid can flow to the bearing under any circumstances to cool and lubricate the bearing.

[0046] In one embodiment, refer to the appendix to the specification. Figure 1 The number of adjustable drain holes 12 is two sets, and the two sets of adjustable drain holes 12 are opened sequentially along the length direction of the expansion groove 13.

[0047] Specifically, by sequentially opening adjustment drain holes 12 along the length of the expansion groove 13, the number of adjustment drain holes 12 used on the flushing column 10 can be adjusted by controlling the length of the adjustment protrusion 21 in the expansion groove 13, thereby achieving the effect of adjusting the flushing flow rate and flushing pressure of the bearing.

[0048] It should be noted that the number of adjustable drain holes 12 can also be three or four sets. The specific number can be determined according to actual needs and is not limited here.

[0049] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiments, the booster pump bearing flushing structure provided by the present invention also includes a sliding bearing 50. The sliding bearing 50 is correspondingly disposed in the telescopic groove 13 by the fixing member 51, and the adjusting protrusion 21 can be slidably inserted into the sliding bearing 50.

[0050] Specifically, the sliding bearing 50 can be made of copper, and the fixing component 51 can be a hexagonal set screw. The sliding bearing 50 is installed in the telescopic groove 13 of the flushing column 10 and fixed to the groove wall by the hexagonal set screw. The hexagonal set screw is hidden inside the flushing column 10, without occupying any extra space or affecting the overall appearance. At the same time, the holes on both the sliding bearing 50 and the flushing column 10 for installing the hexagonal set screw can be drilled using a matching method, which can make the alignment of the two holes more accurate and facilitate the installation of the hexagonal set screw. The two sets of drain holes on the sliding bearing 50 and the flushing column 10 can also be drilled together, which can make the two holes more accurately aligned and achieve a smoother and more stable liquid flow. The adjustment protrusion 21 and the sliding bearing 50 are fitted with a clearance. By installing the sliding bearing 50 between the flushing column 10 and the flushing adjustment component 20, friction between the flushing adjustment component 20 and the flushing column 10 is effectively prevented from damaging the contact structure. This effectively avoids the problem of equipment damage caused by friction between metals, thereby reducing the service life of the flushing structure.

[0051] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiments, a pressure reducing block 23 is provided at the end of the flushing adjustment member 20 away from the adjustment protrusion 21. The pressure reducing block 23 is adapted to the movable groove 32, and a flow gap is left between the pressure reducing block 23 and the groove wall of the movable groove 32.

[0052] Specifically, by setting the pressure reducing block 23, when the liquid in the upper chamber flows to the lower chamber through the gap, the pressure of the liquid decreases, creating a pressure difference between the upper and lower chambers, thereby enabling the flushing regulating component 20 to be pushed downward under the action of the pressure difference.

[0053] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiments, a plurality of pressure relief grooves 22 are provided on one side of the pressure relief block 23 corresponding to the flow gap.

[0054] Specifically, the pressure relief groove 22 is opened on one side facing the flow gap, and several pressure relief grooves 22 are arranged along the direction of the rise and fall of the pressure reducing block 23. By opening several pressure relief grooves 22, the pressure drop of the fluid flowing through this place is increased, making it easier to adjust the flushing pressure and flushing flow rate.

[0055] It should be noted that the size and number of pressure relief tanks can be determined according to actual needs and are not limited here.

[0056] In one embodiment, refer to the appendix to the specification. Figure 1 Based on the above embodiment, a connecting block 15 is provided at one end of the flushing column 10 away from the pressure reducing block 23, and the connecting block 15 is connected to the flushing cover 30 through a connecting member 70.

[0057] Specifically, the flushing cover 30 is installed outside the flushing adjustment component 20, wherein the connecting block 15 is assembled with the flushing cover 30 through the connecting component 70, thereby making the movable groove 32 a sealed structure, and making the flushing cover 30, the flushing adjustment component 20 and the flushing column 10 a tightly integrated whole structure, effectively improving the reliability of the structure.

[0058] It should be noted that the connector 70 can be a screw washer assembly or a snap-fit ​​assembly. The specific structure of the connector 70 depends on the actual situation and is not limited here.

[0059] In one embodiment, refer to the appendix to the specification. Figure 1 A sealing element 60 is sandwiched between the connecting block 15 and the flushing cover 30.

[0060] Specifically, the seal 60 can be a copper gasket, which is installed between the connecting block 15 and the flushing housing 30 to prevent liquid leakage.

[0061] The present invention further provides a centrifugal cryogenic booster pump, including a main bearing and a booster pump bearing flushing structure of any of the above embodiments, wherein the liquid outlet channel 14 of the booster pump bearing flushing structure is correspondingly connected to the main bearing.

[0062] Specifically, the centrifugal cryogenic booster pump with the booster pump bearing flushing structure in any of the above embodiments enables adjustment of the flushing flow rate and flushing pressure of the pump bearing according to changes in the pump outlet pressure. This avoids damage to the pump bearing caused by high-pressure liquid during flushing, thereby improving the pump's service life. Simultaneously, it prevents a decrease in pump efficiency due to excessive flushing flow. The entire solution has the advantages of complete overall design functions, convenient assembly and operation, and guaranteed stable and reliable operation during work.

[0063] The working principle of the centrifugal cryogenic booster pump provided in this application is as follows: When the centrifugal cryogenic booster pump is running, a portion of the liquid in the pump's outlet channel 14 enters the upper chamber of the flushing cover 30 through the inlet 31 of the flushing structure. The liquid entering the upper chamber flows through the gap between the flushing cover 30 and the flushing adjustment component 20 into the lower chamber of the flushing cover 30. Then, it flows through the adjusting drain hole 12 and the fixed drain hole 11 on the flushing column 10 and through the outlet channel 14 on the flushing column 10 to be transported from the flushing structure to the main bearing, thereby cooling and lubricating the main bearing.

[0064] When the pump outlet pressure is low, the liquid flow rate entering the flushing mechanism through the inlet 31 is small, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment component 20 is small, the pressure acting on the spring is small, the deformation of the spring is small, the flushing adjustment component 20 is in a relatively high position, all the adjusting drain holes 12 and the fixed drain holes 11 are open, ensuring that enough liquid can enter the main bearing to cool and lubricate the main bearing. Because the pump outlet pressure is low, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment component 20 is small, which can ensure that the liquid entering the main bearing has enough pressure to cool and lubricate it.

[0065] When the pump outlet pressure is normal, the liquid flow rate entering the flushing mechanism through the inlet 31 is normal, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment component 20 is normal, the pressure acting on the spring is normal, the deformation of the spring is normal, the flushing adjustment component 20 is in a relatively central position, and part of the adjusting drain hole 12 and the fixed drain hole 11 are open to ensure that some liquid can enter the main bearing to cool and lubricate the main bearing and control the flushing flow rate of the bearing. Because the pump outlet pressure is relatively large, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment component 20 is relatively large, which can effectively reduce the liquid pressure entering the bearing to cool and lubricate it, and prevent damage to the main bearing due to excessive flushing pressure.

[0066] When the pump outlet pressure is high, the liquid flow rate entering the flushing mechanism through the inlet 31 is large. The pressure drop generated when the liquid flows through the gap between the flushing housing 30 and the flushing regulating component 20 is large, resulting in a large pressure on the spring and a large spring deformation. The flushing regulating component 20 is in a relatively low position, with all the regulating drain holes 12 closed, and only the fixed drain hole 11 open. This ensures that a small amount of liquid can enter the main bearing for cooling and lubrication, preventing a decrease in the efficiency of the centrifugal cryogenic booster pump due to a large flushing flow rate in the main bearing. Because the pump outlet pressure is high, the pressure drop generated when the liquid flows through the gap between the flushing housing 30 and the flushing regulating component 20 is large, which further reduces the liquid pressure entering the main bearing, preventing damage to the main bearing due to excessive flushing pressure.

[0067] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A booster pump bearing flush structure, characterized by, include: A flushing column, one end of which has a telescopic groove and the other end of which has a liquid outlet channel, the liquid outlet channel being connected to the bottom of the telescopic groove. Several sets of adjusting drain holes are provided on the side wall of the flushing column near the telescopic groove, the adjusting drain holes being connected to the telescopic groove. A flushing adjustment component, one end of which has an adjustment protrusion adapted to the telescopic groove, the adjustment protrusion being slidably inserted into the telescopic groove; An elastic element, which is sleeved on the flushing column; A flushing cover has a movable groove inside, and a liquid inlet hole is correspondingly opened at the bottom of the movable groove. The flushing column and the flushing adjustment component are respectively arranged in the movable groove, and the flushing cover is correspondingly connected to the flushing column. The flushing cover is fitted around the flushing adjustment member, and under the dividing action of the flushing adjustment member, the space inside the movable groove is divided into an upper chamber and a lower chamber. The size of the upper chamber and the lower chamber changes with the position of the flushing adjustment member. In addition, a gap is formed between the flushing adjustment member and the flushing cover to allow liquid to flow from the upper chamber to the lower chamber.

2. The booster pump bearing flushing structure according to claim 1, characterized in that, In the free state, one end of the elastic member abuts against the flushing column, and the other end of the elastic member abuts against the flushing adjustment member, so that the length of the adjustment protrusion extending into the telescopic groove is less than the distance between the adjustment drain hole and the opening of the telescopic groove.

3. The booster pump bearing flushing structure according to claim 1, characterized in that, A fixed drain hole is provided on the side wall of the flushing column near the liquid outlet channel, and the fixed drain hole is connected to the liquid outlet channel.

4. The booster pump bearing flushing structure according to any one of claims 1-3, characterized in that, The number of the regulating drain holes is two sets, and the two sets of regulating drain holes are opened sequentially along the length direction of the expansion groove.

5. The booster pump bearing flushing structure according to claim 4, characterized in that, Also includes: A sliding bearing is provided in the telescopic groove by means of a fixing member, and the adjusting protrusion is slidably inserted into the sliding bearing.

6. The booster pump bearing flushing structure according to claim 5, characterized in that, A pressure-reducing block is provided at one end of the flushing adjustment component away from the adjustment protrusion. The pressure-reducing block is adapted to the movable groove, and a flow gap is left between the pressure-reducing block and the groove wall of the movable groove.

7. The booster pump bearing flushing structure according to claim 6, characterized in that, The pressure relief block has several pressure relief grooves on one side corresponding to the flow gap.

8. The booster pump bearing flushing structure according to claim 7, characterized in that, A connecting block is provided at one end of the flushing column away from the pressure reducing block, and the connecting block is connected to the flushing hood via a connector.

9. The booster pump bearing flushing structure according to claim 8, characterized in that, A sealing element is sandwiched between the connecting block and the flushing cover.

10. A centrifugal cryogenic booster pump, characterized in that, include: The main bearing and the booster pump bearing flushing structure as described in any one of claims 1-9, wherein the liquid outlet channel of the booster pump bearing flushing structure is correspondingly connected to the main bearing.

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