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

Abstract

The booster pump bearing flushing structure comprises a flushing column, a flushing adjusting piece, an elastic piece and a flushing housing, a telescopic groove and a liquid outlet channel are formed in the flushing column, and the liquid outlet channel is correspondingly communicated with the groove bottom of the telescopic groove; the side wall of the flushing column is provided with a plurality of sets of adjusting drainage holes correspondingly communicated with the telescopic groove and a plurality of sets of fixed drainage holes correspondingly communicated with the liquid outlet channel, one end of the flushing adjusting piece is provided with an adjusting protrusion matched with the telescopic groove, the flushing column is sleeved with the elastic piece, and a movable groove is formed in the flushing housing. A movable groove is formed in the upper portion of the bearing, a liquid inlet hole is correspondingly formed in the groove bottom of the movable groove, the washing column and the washing adjusting piece are correspondingly arranged in the movable groove, and the washing cover shell is correspondingly connected with the washing column. And the damage of high-pressure liquid to the bearing of the pump in the flushing process is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of centrifugal pumps, and further to a booster pump bearing flushing structure and a centrifugal low-temperature booster pump. Background Art

[0002] The centrifugal cryogenic booster pump is a mechatronic multi-stage pump that is immersed in cryogenic liquid and operates. It belongs to the category of centrifugal pumps. The motor drives the shaft to rotate, and the shaft 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 main structure of the centrifugal cryogenic booster pump is a vertical multi-stage submersible pump, which is used in the regasification system of the floating storage and regasification device. The main function of the pump is to pressurize the liquid LNG. The pressurized liquid LNG is vaporized through the high-pressure vaporizer and enters the onshore gas users or the municipal natural gas pipeline network.

[0004] Most existing centrifugal cryogenic booster pumps have throttle holes at the pump outlet flange, and part of the liquid at the pump outlet flows through the throttle hole to the bearing to cool and lubricate the bearing. Since centrifugal cryogenic booster pumps are mostly driven by variable frequency motors, when the motor frequency is high, the pressure at the pump outlet is high, and the pressure after passing through the throttle hole is high. The high-pressure liquid flushes the bearing and damages the bearing, reducing the service life of the pump. At the same time, when the pump outlet pressure is high, the leakage at the throttle hole increases, resulting in reduced pump efficiency. Summary of the invention

[0005] In view of the above technical problems, an object of the present invention is to provide a booster pump bearing flushing structure to solve the problems raised in the above background technology. Another object of the present invention is to provide a centrifugal low-temperature booster pump.

[0006] In order to achieve the above object, the present invention provides a booster pump bearing flushing structure, comprising:

[0007] A flushing column, wherein a telescopic groove is provided at one end of the flushing column, a liquid outlet channel is provided at the other end of the flushing column, the liquid outlet channel is correspondingly connected to the bottom of the telescopic groove, and a plurality of groups of regulating leakage holes are provided on the side wall of one end of the flushing column close to the telescopic groove, and the regulating leakage holes are correspondingly connected to the telescopic groove;

[0008] A flushing adjustment member, one end of which is provided with an adjustment protrusion adapted to the telescopic slot, and the adjustment protrusion is correspondingly and slidably inserted into the telescopic slot;

[0009] An elastic member, wherein the elastic member is sleeved on the flushing column;

[0010] A flushing cover is provided inside the flushing cover, and a liquid inlet hole is correspondingly provided at the bottom of the movable groove, the flushing column and the flushing adjustment member are correspondingly arranged in the movable groove, and the flushing cover is correspondingly connected to the flushing column.

[0011] In some embodiments, in a free state, one end of the elastic member abuts against the flushing column, and the other end of the elastic member correspondingly 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 leakage hole and the opening of the telescopic groove.

[0012] In some embodiments, a fixed leakage hole is opened on the side wall of the flushing column at one end close to the liquid outlet channel, and the fixed leakage hole is correspondingly connected to the liquid outlet channel.

[0013] By opening a fixed leakage hole on the side wall of the flushing column, it is achieved that in any case, the structure provided by the present application can allow liquid to flow to the bearing to cool and lubricate the bearing.

[0014] In some embodiments, the number of the regulating leakage holes is two groups, and the two groups of regulating leakage holes are opened sequentially along the length direction of the telescopic slot.

[0015] By opening regulating leakage holes in sequence along the length direction of the expansion slot, it is possible to adjust the number of regulating leakage holes put into use on the flushing column by controlling the length of the regulating protrusion in the expansion slot, thereby achieving the effect of adjusting the bearing flushing flow 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 correspondingly arranged in the telescopic groove through a fixing member, and the adjusting protrusion can be correspondingly slidably inserted into the sliding bearing.

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

[0019] In some embodiments, a pressure reducing block is provided on one end of the flushing adjusting member away from the adjusting protrusion, the pressure reducing block is matched with 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, a plurality of pressure relief grooves are provided on one side of the pressure reducing block corresponding to the flow gap.

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

[0022] In some embodiments, a connection block is provided on one end of the flushing column away from the pressure reducing block, and the connection block is correspondingly connected to the flushing housing via a connecting piece.

[0023] By arranging a connection block to connect with the flushing cover, the movable groove becomes a sealed structure, and the flushing cover, the flushing adjustment member and the flushing column become a tightly integrated integral structure, which effectively improves the reliability of the structure.

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

[0025] A copper gasket is installed between the connection block and the flushing housing for sealing, so as to prevent liquid leakage.

[0026] According to another aspect of the present invention, the present invention further provides a centrifugal low-temperature 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 the present invention has a flushing adjustment member that can be slidably inserted into the flushing column, and is used in conjunction with the flushing adjustment member and the elastic member through the drain hole, so that the flushing flow and flushing pressure of the pump bearing can be adjusted according to the change of the pump outlet pressure, thereby avoiding damage to the pump bearing by high-pressure liquid during the flushing process, thereby increasing the service life of the pump and avoiding the reduction of the pump efficiency due to excessive flushing flow. The entire solution has the advantages of complete overall design functions, convenient assembly and easy operation, and ensuring smooth operation and safety and reliability during the working process;

[0030] 2. The booster pump bearing flushing structure provided by the present invention prevents equipment damage caused by friction between metals by installing a sliding bearing between the flushing column and the flushing adjustment member, thereby increasing the service life of the flushing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

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

[0033] Description of Figure Numbers:

[0034] Flushing column 10, fixed leakage hole 11, adjustable leakage hole 12, telescopic groove 13, liquid outlet channel 14, connecting block 15, flushing adjustment member 20, adjusting protrusion 21, pressure relief groove 22, pressure reducing block 23, flushing cover 30, liquid inlet hole 31, movable groove 32, elastic member 40, sliding bearing 50, fixing member 51, sealing member 60, connecting member 70. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0036] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0037] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0039] In one embodiment, the reference specification Figure 1The present invention provides a booster pump bearing flushing structure, including a flushing column 10, a flushing adjustment member 20, a flushing cover 30 and an elastic member 40, wherein one end of the flushing column 10 is provided with a telescopic groove 13, and the other end of the flushing column 10 is provided with a liquid outlet channel 14, and the liquid outlet channel 14 is correspondingly connected to the bottom of the telescopic groove 13, wherein the end of the flushing column 10 close to the telescopic groove 13 is the upper part of the flushing column, and the end of the flushing column 10 close to the liquid outlet channel 14 is the lower part of the flushing column, and a plurality of groups of regulating drain holes 12 are provided on the side wall of the upper part of the flushing column 10, and the regulating drain holes 12 are connected to the telescopic groove 13. The groove 13 is connected correspondingly, a fixed leakage hole 11 is opened on the side wall of the lower part of the flushing column 10, and the fixed leakage hole 11 is connected correspondingly with the liquid outlet channel 14. An adjustment protrusion 21 adapted to the telescopic groove 13 is opened at one end of the flushing adjustment member 20, and the adjustment protrusion 21 can be slidably inserted into the telescopic groove 13 accordingly. The elastic member 40 is sleeved on the flushing column 10, and a movable groove 32 is opened in the flushing cover 30, and a liquid inlet hole 31 is opened at the bottom of the movable groove 32 accordingly. The flushing column 10 and the flushing adjustment member 20 are correspondingly arranged in the movable groove 32, and the flushing cover 30 is correspondingly connected to the flushing column 10.

[0040] Specifically, the flushing column 10 is cylindrical, one end is hollow to form a telescopic groove 13, and the other end is provided with a liquid outlet channel 14 connected to the bottom of the telescopic groove 13. The side wall of the upper part of the flushing column 10 is provided with a plurality of groups of regulating leakage holes 12 corresponding to the telescopic groove 13, so that the liquid can flow into the telescopic groove 13 through the regulating leakage holes 12, and then flow to the bearing of the pump through the liquid outlet channel 14. The regulating protrusion 21 of the flushing regulating member 20 is correspondingly rod-shaped, and the rod-shaped regulating protrusion 21 can be telescopically inserted into the telescopic groove 13, so that the regulating leakage 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 flowing 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 sizes of the upper chamber and the lower chamber change 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 for 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 pressure of the liquid decreases during the flow process, causing a pressure difference between the upper chamber and the lower chamber. Under the action of the pressure difference, the flushing adjustment member 20 is pushed downward. During the downward movement of the flushing adjustment member 20, the elastic member 40 is deformed, generating an upward elastic force on the flushing adjustment member 20 to balance the pressure difference generated by the liquid in the upper and lower chambers on the flushing adjustment member 20. The liquid in the lower chamber enters the telescopic groove 13 in the flushing column 10 through the regulating leakage hole 12 on the flushing column 10, and is then transported to the bearing through the liquid outlet channel 14 for cooling and lubrication. When the pressure of the liquid changes, the pressure difference between the upper chamber and the lower chamber will change, the elastic force of the elastic member 40 will also change, the deformation of the elastic member 40 will also change, and then the equilibrium position of the flushing adjustment member 20 will also change, thereby changing the number of leakage holes put into use on the flushing column 10, thereby achieving the effect of adjusting the flushing flow and flushing pressure of the bearing.

[0042] In one embodiment, the reference specification Figure 1 On the basis of the above embodiment, 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 correspondingly 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 member 40 is a spring, and springs with different stiffness coefficients can be selected according to different use environments, thereby achieving the purpose of changing and adjusting different flushing effects.

[0044] In one embodiment, the reference specification Figure 1 On the basis of the above embodiment, a fixed leakage hole 11 is opened on the side wall of the lower part of the flushing column 10, and the fixed leakage hole 11 is correspondingly connected to the liquid outlet channel 14.

[0045] Specifically, by providing the fixed leakage hole 11, it is achieved that in any case, the structure provided by the present application can allow liquid to flow to the bearing to cool and lubricate the bearing.

[0046] In one embodiment, the reference specification Figure 1 The number of the regulating leakage holes 12 is two groups, and the two groups of regulating leakage holes 12 are opened in sequence along the length direction of the telescopic slot 13.

[0047] Specifically, by opening the regulating leakage holes 12 in sequence along the length direction of the telescopic groove 13, it is possible to adjust the number of regulating leakage holes 12 put into use on the flushing column 10 by controlling the length of the regulating protrusion 21 in the telescopic groove 13, thereby achieving the effect of adjusting the flushing flow and flushing pressure of the bearing.

[0048] It should be pointed out that the number of the regulating leakage holes 12 can also be three or four groups. The specific number can be determined according to actual needs and is not limited here.

[0049] In one embodiment, the reference specification Figure 1 On the basis of the above embodiments, the booster pump bearing flushing structure provided by the present invention further includes a sliding bearing 50, which is correspondingly arranged in the telescopic groove 13 through a fixing member 51, and the adjusting protrusion 21 can be correspondingly slidably inserted into the sliding bearing 50.

[0050] Specifically, the sliding bearing 50 can be made of copper, and the fixing member 51 can be a hexagon socket flat-end 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 hexagon socket flat-end set screw. The hexagon socket flat-end set screw is hidden inside the flushing column 10, does not occupy other redundant space, and does not affect the overall appearance. At the same time, the holes for installing the hexagon socket flat-end set screw on the sliding bearing 50 and the flushing column 10 can be drilled, which can make the two holes more accurately aligned, so as to facilitate the installation of the hexagon socket flat-end set screw. The two sets of drainage holes on the sliding bearing 50 and the flushing column 10 can also be drilled in a matching manner, so that the two holes can be more accurately aligned to achieve a smoother and more even flow of liquid. The adjustment protrusion 21 and the sliding bearing 50 are clearance-fitted. By installing the sliding bearing 50 between the flushing column 10 and the flushing adjustment member 20, friction between the flushing adjustment member 20 and the flushing column 10 is effectively prevented from causing damage to the contact structure between the two, thereby effectively avoiding friction between metals that causes damage to the equipment, thereby reducing the service life of the flushing structure.

[0051] In one embodiment, the reference specification Figure 1 On the basis of the above embodiment, a pressure reducing block 23 is provided on the end of the flushing adjusting member 20 away from the adjusting 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 providing 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 is reduced to generate a pressure difference between the upper chamber and the lower chamber, thereby enabling the flushing adjustment member 20 to be pushed downward under the action of the pressure difference.

[0053] In one embodiment, the reference specification Figure 1 On the basis of the above embodiment, a plurality of pressure relief grooves 22 are provided on one side of the pressure reducing block 23 corresponding to the flow gap.

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

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

[0056] In one embodiment, the reference specification Figure 1 On the basis of the above embodiment, a connecting block 15 is provided on one end of the flushing column 10 away from the pressure reducing block 23 , and the connecting block 15 is correspondingly connected to the flushing housing 30 through a connecting piece 70 .

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

[0058] It should be pointed out that the connecting member 70 can be a screw-washer assembly or a snap-on assembly. The specific structure of the connecting member 70 depends on the actual situation and is not limited here.

[0059] In one embodiment, the reference specification Figure 1 A sealing member 60 is sandwiched between the connecting block 15 and the flushing housing 30 .

[0060] Specifically, the sealing member 60 may be a copper pad, and the copper pad is installed between the connecting block 15 and the flushing housing 30 for sealing to achieve the effect of preventing liquid leakage.

[0061] The present invention further provides a centrifugal low-temperature booster pump, comprising 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 connected to the main bearing.

[0062] Specifically, the centrifugal low-temperature booster pump having the booster pump bearing flushing structure in any of the above embodiments can adjust the flushing flow and flushing pressure of the pump bearing according to the change of the pump outlet pressure, thereby avoiding the high-pressure liquid from damaging the pump bearing during the flushing process, thereby increasing the service life of the pump and avoiding the reduction of the pump efficiency due to excessive flushing flow. The entire solution has the advantages of complete overall design functions, convenient assembly and easy operation, and ensuring smooth operation and safety and reliability during the working process.

[0063] The working principle of the centrifugal low-temperature booster pump provided in the present application is specifically as follows: when the centrifugal low-temperature booster pump is running, a portion of the liquid in the pump's liquid outlet channel 14 enters the upper chamber in the flushing cover 30 through the flushing structure liquid inlet 31, and the liquid entering the upper chamber flows through the gap between the flushing cover 30 and the flushing adjustment member 20 to enter the lower chamber of the flushing cover 30, and then flows through the adjustable leakage hole 12 and the fixed leakage hole 11 on the flushing column 10 through the liquid outlet channel 14 on the flushing column 10 and is 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 liquid inlet 31 is small, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment member 20 is small, the pressure acting on the spring is small, the deformation of the spring is small, the flushing adjustment member 20 is in a relatively upper position, all the regulating leakage holes 12 and the fixed leakage holes 11 are open, ensuring that enough liquid can enter the main bearing to cool and lubricate the main bearing. Since 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 member 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 liquid inlet 31 is normal, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment member 20 is normal, the pressure acting on the spring is normal, the deformation of the spring is normal, the flushing adjustment member 20 is in a relatively middle position, and some of the regulating leakage holes 12 and the fixed leakage holes 11 are opened 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. Since the pump outlet pressure is relatively high, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment member 20 is relatively large, which can effectively reduce the liquid pressure entering the bearing for cooling and lubricating it, and prevent the main bearing from being damaged due to excessive flushing pressure;

[0066] When the pump outlet pressure is high, the liquid flow rate entering the flushing mechanism through the liquid inlet 31 is high, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment member 20 is large, the pressure acting on the spring is large, the deformation of the spring is large, the flushing adjustment member 20 is in a relatively low position, the regulating leakage holes 12 are all closed, and only the fixed leakage holes 11 are opened, ensuring that a small amount of liquid can enter the main bearing to cool and lubricate the main bearing, and prevent the efficiency of the centrifugal low-temperature booster pump from being reduced due to the large flushing flow rate of the main bearing. Since the pump outlet pressure is high, the pressure drop generated when the liquid flows through the gap between the flushing cover 30 and the flushing adjustment member 20 is large, which can further reduce the liquid pressure entering the main bearing, and prevent 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 only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A booster pump bearing flushing structure, characterized in that: include: A flushing column, wherein a telescopic groove is provided at one end of the flushing column, a liquid outlet channel is provided at the other end of the flushing column, the liquid outlet channel is correspondingly connected to the bottom of the telescopic groove, and a plurality of groups of regulating leakage holes are provided on the side wall of one end of the flushing column close to the telescopic groove, and the regulating leakage holes are correspondingly connected to the telescopic groove; A flushing adjustment member, one end of which is provided with an adjustment protrusion adapted to the telescopic slot, and the adjustment protrusion is correspondingly and slidably inserted into the telescopic slot; An elastic member, wherein the elastic member is sleeved on the flushing column; A flushing cover is provided inside the flushing cover, and a liquid inlet hole is correspondingly provided at the bottom of the movable groove, the flushing column and the flushing adjustment member are correspondingly arranged in the movable groove, and the flushing cover is correspondingly connected to the flushing column.

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 correspondingly abuts against the flushing adjustment member, so that the length of the adjustment protrusion extending into the telescopic groove is smaller than the distance between the adjustment leakage hole and the opening of the telescopic groove.

3. The booster pump bearing flushing structure according to claim 1, characterized in that: A fixed leakage hole is provided on the side wall of the flushing column at one end close to the liquid outlet channel, and the fixed leakage hole is correspondingly communicated with the liquid outlet channel.

4. The booster pump bearing flushing structure according to any one of claims 1 to 3, characterized in that: The number of the regulating leakage holes is two groups, and the two groups of regulating leakage holes are opened in sequence along the length direction of the telescopic slot.

5. The booster pump bearing flushing structure according to claim 4, characterized in that: Also includes: A sliding bearing is correspondingly arranged in the telescopic groove through a fixing member, and the adjusting protrusion is correspondingly 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 arranged at one end of the flushing adjusting member away from the adjusting protrusion. The pressure reducing block is matched with 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: A plurality of pressure relief grooves are provided on one side of the pressure reducing block corresponding to the flow gap.

8. The booster pump bearing flushing structure according to claim 7, characterized in that: A connecting block is provided on one end of the flushing column away from the pressure reducing block, and the connecting block is correspondingly connected to the flushing housing through a connecting piece.

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

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

Images