Pump with self-cleaning structure

Abstract

The utility model provides a kind of pump with self-flushing structure, it is related to pump equipment technical field, including pump body, pump shaft, main impeller, self-flushing structure, self-flushing waterway structure and the support structure between the inner tube and pump shaft, and the inlet and outlet are equipped on pump body;Main impeller is used to drive water body by inlet to flow to outlet by pump body;Self-flushing structure includes inner tube and the auxiliary impeller being set on pump shaft, auxiliary impeller and pump shaft synchronous rotation;Self-flushing waterway structure is connected with outlet and inner tube;At least one friction pair of rotating fit can be formed between support structure and pump shaft, and auxiliary impeller is used to make water body flush and lubricate friction pair.The utility model can produce sustained suction by auxiliary impeller to drive water body to enter inner tube to play lubricating and flushing effect, improve the reliability and service life of pump equipment, especially applicable in the scene that clean water source cannot be obtained, with better use convenience and adaptability.

Description

Technical Field

[0001] This utility model relates to the field of pump equipment technology, and in particular to a pump with a self-flushing structure. Background Technology

[0002] Vertical cantilever pumps are widely used in power plants and petrochemical plants to provide cooling water for the equipment. The operational stability of the vertical cantilever pump directly affects the normal operation of the entire system. Cooling water is usually taken from natural water sources, such as seawater or river water, which often contain a certain amount of silt or other solid impurities. During pump operation, these impurities enter the gaps between the packing, guide bearings, and bushings with the medium, causing wear on key components, which in turn affects sealing performance and bearing operational stability, shortening the overall service life of the pump. To alleviate these problems, existing technologies typically employ flushing structures, introducing clean media to flush the packing and guide bearings to remove silt and other impurities, thereby extending the service life of components. However, this flushing method is dependent on a clean water source, requiring a stable and clean supply of flushing media on-site. However, in some practical engineering applications, especially in remote areas or places with inadequate infrastructure, it is often difficult for customers to provide a clean water source that meets the requirements, causing the flushing system to malfunction and affecting the reliability and maintenance cycle of the pump equipment. Furthermore, some existing improvement solutions attempt to reduce the risk of impurities entering critical friction pairs by incorporating internal filtration structures or employing external circulation flushing. However, due to issues such as complex structures, difficult maintenance, or low flushing efficiency, these solutions have not fundamentally solved the wear problem caused by impure media. Therefore, how to effectively flush pumps in the absence of clean water sources to improve operational reliability and service life has become an urgent technical problem to be solved. Utility Model Content

[0003] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a pump with a self-flushing structure for effective flushing in the absence of clean water source, so as to improve the operational reliability and service life of the pump equipment.

[0004] The above-mentioned objective of this utility model can be achieved by the following technical solution: This utility model provides a pump with a self-flushing structure, comprising:

[0005] A pump body, wherein the pump body is provided with an inlet and an outlet;

[0006] A pump shaft, which is rotatably disposed within the pump body;

[0007] The main impeller is tractably connected to the pump shaft and is used to drive water from the inlet through the pump body to the outlet.

[0008] The self-flushing structure includes an inner tube inserted into the pump body and an auxiliary impeller disposed on the pump shaft. The auxiliary impeller is spaced at a preset distance from the main impeller and placed in the inner tube. The auxiliary impeller rotates synchronously with the pump shaft.

[0009] A self-flushing water circuit structure, wherein the self-flushing water circuit structure connects the liquid outlet and the inner tube;

[0010] A support structure is provided between the inner tube and the pump shaft, and at least one friction pair is formed between the support structure and the pump shaft to form a rotational fit. The auxiliary impeller is used to flush and lubricate the friction pair with water.

[0011] In a preferred embodiment of this utility model, the auxiliary impeller generates driving pressure on the side facing the main impeller and driving suction on the side away from the main impeller, and the self-flushing water channel structure is connected to the side of the auxiliary impeller that generates driving suction.

[0012] The support structure includes a first support structure disposed on the side of the auxiliary impeller away from the main impeller, and one end of the pump shaft passes through the first support structure for connection with the motor shaft.

[0013] The first support structure includes a first bushing fixedly sleeved on the pump shaft and a first guide bearing sleeved on the outside of the first bushing, wherein the first guide bearing and the first bushing form a friction pair;

[0014] Along the axial direction of the pump shaft, a first suction zone is formed between the first guide bearing and the auxiliary impeller. The first suction zone is used to connect the self-flushing water circuit structure and the inner pipe.

[0015] In a preferred embodiment of this utility model, an auxiliary impeller bushing is sleeved on the pump shaft, and the auxiliary impeller is fixed on the auxiliary impeller bushing.

[0016] The auxiliary impeller is a booster impeller or a propeller-type impeller;

[0017] The auxiliary impeller bushing is an integral structure with the first bushing.

[0018] In a preferred embodiment of the present invention, the self-flushing water circuit structure includes a first pipeline and two first control valves spaced apart on the first pipeline. The first pipeline connects the liquid outlet and the inner pipe, and a first filter is provided on the first pipeline between the two first control valves.

[0019] In a preferred embodiment of the present invention, the pump with the self-flushing structure further includes a differential pressure transmitter connected in parallel with the first filter, the differential pressure transmitter being used to detect the pressure difference across the first filter.

[0020] In a preferred embodiment of the present invention, the self-flushing water circuit structure further includes a second pipeline connected in parallel with the first pipeline, and two second control valves spaced apart on the second pipeline. The second pipeline is used to connect the liquid outlet and the inner pipe, and a second filter is provided on the second pipeline between the two second control valves.

[0021] In a preferred embodiment of the present invention, the self-flushing water circuit structure further includes a third pipeline, which connects the first pipeline and the second pipeline and is located downstream of the first control valve and the second control valve.

[0022] In a preferred embodiment of the present invention, the first support structure further includes a support sleeve that is detachably fixed to the inner tube and sleeved on the pump shaft, and the circumferential sidewall of the support sleeve is provided with a first water inlet hole for connecting the first suction zone and the first pipeline.

[0023] The lower end of the support sleeve forms an annular throat, and the auxiliary impeller is rotatably disposed at the annular throat position.

[0024] In a preferred embodiment of the present invention, the first support structure further includes a stuffing box fixed to the inner tube and sleeved on the first bushing, and a sealing packing disposed between the stuffing box and the first bushing. The first guide bearing is disposed on the stuffing box and positioned below the sealing packing. The area between the sealing packing and the first guide bearing forms a second suction zone. The stuffing box is provided with a second water inlet hole for connecting the second suction zone and the second pipeline.

[0025] A water guide groove is provided between the first guide bearing and the first bushing to guide the water in the first suction zone to the second suction zone.

[0026] In a preferred embodiment of the present invention, the pump with a self-flushing structure further includes a water storage tank disposed above the stuffing box, the water storage tank being used to collect water that leaks upward through the stuffing box.

[0027] In a preferred embodiment of the present invention, the pump is a vertical cantilever pump, and the support structure includes a second support structure in the region between the auxiliary impeller and the main impeller. The second support structure includes at least one second bushing disposed on the pump shaft and at least one second guide bearing disposed between the inner tube and the second bushing. A friction pair is formed between the second bushing and the second guide bearing.

[0028] A water guide groove is provided between the second guide bearing and the second bushing to guide water from the side of the second support structure away from the main impeller to the side of the second support structure closer to the main impeller.

[0029] The technical solution of this utility model has the following significant beneficial effects:

[0030] In use, the self-flushing structure of this invention rotates the pump shaft, driving the main impeller to transport water from the inlet to the outlet through the flow channel. The self-flushing water path then transports the water from the outlet to the inner pipe. By synchronizing the auxiliary impeller with the pump shaft, the auxiliary impeller generates sufficient suction to draw in and pressurize the water. The water flows towards the auxiliary impeller, effectively lubricating and flushing the friction pairs, reducing heat generated by friction, preventing overheating damage, and thus improving the operational stability and service life of the guide bearing and bushing. This lubrication and cooling mechanism eliminates the need for traditional grease lubrication or external cooling systems, simplifying the structure and reducing maintenance costs. This invention requires no external water source, making it better suited for scenarios where clean water is unavailable, offering greater ease of use and adaptability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0033] Figure 1 This is a cross-sectional view of one embodiment of the waterway structure described in this utility model;

[0034] Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the second bushing and the second guide bearing of this utility model;

[0035] Figure 3 This is a cross-sectional structural schematic diagram of one embodiment of the pump equipment described in this utility model;

[0036] Figure 4 This is a cross-sectional structural diagram of one embodiment of the first suction region and the second suction region of this utility model.

[0037] The reference numerals in the above figures are as follows:

[0038] 10. First suction zone;

[0039] 20. Second suction zone;

[0040] 110. Pump body; 111. Inlet; 112. Outlet; 113. First inlet hole; 114. Second inlet hole; 115. Outlet hole; 120. Inner tube; 130. Pump shaft; 140. Main impeller; 150. Stuffing box; 151. Sealing packing; 160. First shaft sleeve; 170. First guide bearing; 180. Water storage tank; 190. Support sleeve; 191. Annular throat;

[0041] 200. Auxiliary impeller; 210. Auxiliary impeller bushing;

[0042] 310, First pipeline; 320, First control valve; 330, Differential pressure transmitter; 340, Second pipeline; 350, Second control valve; 360, Third pipeline;

[0043] 410. First filter; 420. Second filter;

[0044] 500, Second bushing;

[0045] 600, Second guide bearing;

[0046] 700, Exit Section;

[0047] 800, motor mount;

[0048] 900. Drive motor. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] Please refer to the following: Figures 1 to 4 As shown, an embodiment of this utility model provides a pump with a self-flushing structure. The pump includes a pump body 110, a pump shaft 130, a main impeller 140, a self-flushing structure, a self-flushing water passage structure, and a support structure disposed between the inner pipe 120 and the pump shaft 130. The pump body 110 is provided with an inlet 111 and an outlet 112. The pump shaft 130 is rotatably disposed within the pump body 110. The main impeller 140 is driveably connected to the pump shaft 130, and the main impeller 140 is used to drive water from the inlet 111 through… The pump body 110 flows to the outlet 112; the self-flushing structure includes an inner tube 120 inserted into the pump body 110 and an auxiliary impeller 200 disposed on the pump shaft 130. The auxiliary impeller 200 is spaced apart from the main impeller 140 by a predetermined distance and is placed in the inner tube 120. The auxiliary impeller 200 rotates synchronously with the pump shaft 130; the self-flushing water passage structure connects the outlet 112 and the inner tube 120; the support structure and the pump shaft 130 form at least one friction pair that can rotate together. The auxiliary impeller 200 is used to flush and lubricate the friction pair with water.

[0051] Overall, when in use, this pump with a self-flushing structure rotates the main impeller 140 via the pump shaft 130, transporting water from the inlet 111 through the flow channel to the outlet 112. The self-flushing water path then transports the water from the outlet 112 to the inner pipe 120. Furthermore, by synchronously rotating the auxiliary impeller 200 with the pump shaft 130, the auxiliary impeller 200 generates sufficient suction to draw in and pressurize the water. The water flows towards the auxiliary impeller 200, effectively lubricating and flushing the friction pairs, reducing heat generated by friction, preventing overheating damage, and thus improving the operational stability and service life of the guide bearing and bushing. This lubrication and cooling mechanism eliminates the need for traditional grease lubrication or external cooling systems, simplifying the structure and reducing maintenance costs. This invention requires no external water source, making it better suited for scenarios where clean water is unavailable, offering greater ease of use and adaptability.

[0052] In an embodiment of this utility model, a water outlet 115 is provided on the liquid outlet 112, and the self-flushing water passage structure is connected to the water outlet 115. Preferably, the water outlet 115 is located on the top or side of the liquid outlet 112, so that the self-flushing water passage structure can be arranged above or to the side of the liquid outlet 112, which facilitates installation and maintenance.

[0053] In the embodiments of this utility model, the designer can adjust the pressurization amount of the auxiliary impeller 200 according to the usage requirements, and no specific limitation is made here. Preferably, the water pressure of the water after being pressurized by the auxiliary impeller 200 is about 1 barg to 2 barg higher than the water pressure at the outlet of the main impeller 140.

[0054] In the embodiments of the utility model, such as Figure 1 and Figure 2 In the embodiment shown, the auxiliary impeller 200 generates driving pressure on the side facing the main impeller 140 and driving suction on the side away from the main impeller 140. The self-flushing water passage structure is connected to the side of the auxiliary impeller 200 that generates driving suction. The support structure includes a first support structure disposed on the side of the auxiliary impeller 200 away from the main impeller 140. One end of the pump shaft 130 passes through the first support structure for connection to the motor shaft. The first support structure includes a first bushing 160 fixedly sleeved on the pump shaft 130 and a first guide bearing 170 sleeved on the outside of the first bushing 160. The first guide bearing 170 and the first bushing 160 form a friction pair. Along the axial direction of the pump shaft 130, a first suction zone 10 is formed between the first guide bearing 170 and the auxiliary impeller 200. The first suction zone 10 is used to connect the self-flushing water passage structure and the inner pipe 120.

[0055] Specifically, an auxiliary impeller sleeve 210 is fitted onto the pump shaft 130, and the auxiliary impeller 200 is fixed to the auxiliary impeller sleeve 210. Designers can adjust the specific shape and structure of the auxiliary impeller 200 according to usage requirements, and no specific restrictions are imposed here.

[0056] In one feasible embodiment, the auxiliary impeller 200 is a booster impeller. The booster impeller rotates synchronously under the drive of the pump shaft 130, and uses centrifugal force to draw in and pressurize water, so that the water pressure of the pressurized water is higher than the outlet pressure of the main impeller 140 by a certain amount, thereby achieving the functions of flushing and lubrication.

[0057] In another feasible embodiment, the auxiliary impeller 200 is a propeller-type impeller. The propeller-type impeller rotates synchronously under the drive of the pump shaft 130, and draws in and pressurizes the filtered clean water through the helical propulsion principle, thereby achieving the functions of flushing and lubrication.

[0058] Furthermore, to reduce the difficulty of setting up the auxiliary impeller bushing 210, in this embodiment of the invention, the auxiliary impeller bushing 210 and the first bushing 160 are an integral structure. By making the auxiliary impeller bushing 210 and the first bushing 160 an integral structure, the installation difficulty is reduced, and the structural strength and stability of both are improved.

[0059] In the embodiments of this utility model, such as Figure 1 The embodiment shown includes a self-flushing water circuit structure including a first pipeline 310 and two first control valves 320 spaced apart on the first pipeline 310. The first pipeline 310 connects the outlet 112 and the inner pipe 120. A first filter 410 is provided on the first pipeline 310 between the two first control valves 320.

[0060] Water from the outlet 112 can be transported to the inner pipe 120 through the first pipe 310, and the water in the first pipe 310 can be filtered through the first filter 410, thereby continuously obtaining clean flushing water. Furthermore, the two first control valves 320 can realize the opening and closing of the first pipe 310 and the flow rate adjustment function, and also facilitate the disassembly or installation of the first filter 410, improving operational controllability and maintenance convenience.

[0061] In the embodiments of this utility model, such as Figure 1 In the embodiment shown, the pump with the self-flushing structure also includes a differential pressure transmitter 330 connected in parallel with the first filter 410. The differential pressure transmitter 330 is used to detect the pressure difference across the first filter 410.

[0062] The differential pressure transmitter 330 can monitor the pressure difference across the first filter 410 in real time, thereby determining the clogging status of the first filter 410 based on the pressure difference. When the pressure difference exceeds the set value, the degree of clogging of the first filter 410 can be determined and a maintenance warning can be issued in a timely manner.

[0063] In the embodiments of this utility model, such as Figure 1 The embodiment shown further includes a second pipeline 340 connected in parallel with the first pipeline 310, and two second control valves 350 spaced apart on the second pipeline 340. The second pipeline 340 is used to connect the outlet 112 and the inner pipe 120. A second filter 420 is provided on the second pipeline 340 between the two second control valves 350.

[0064] By setting up the second pipeline 340, redundancy is achieved, enabling continuous operation and online maintenance of the self-flushing water circuit structure. When one filter needs cleaning or replacement, the corresponding control valve can be used to switch to the other pipeline, ensuring a continuous supply of flushing water and avoiding any impact on the flushing effect. Furthermore, the differential pressure transmitter 330 can monitor the pressure difference across the second filter 420 in real time. When the pressure difference exceeds a set value, the degree of blockage in the second filter 420 can be determined, a maintenance warning can be issued promptly, and the system can switch to the first filter 410 for filtration.

[0065] In the embodiments of this utility model, such as Figure 1 and Figure 4 In the embodiment shown, the first support structure further includes a support sleeve 190 that is detachably fixed to the inner tube 120 and sleeved on the pump shaft 130. The circumferential sidewall of the support sleeve 190 is provided with a first water inlet hole 113 for connecting the first suction zone 10 and the first pipeline 310. The lower end of the support sleeve 190 forms an annular throat 191, and the auxiliary impeller 200 is rotatably disposed at the position of the annular throat 191.

[0066] Specifically, the support sleeve 190 can be welded and fixed to the top of the inner tube 120. The support sleeve 190 and the stuffing box 150 are detachably connected by multiple bolts, and a sealing ring is also provided between the support sleeve 190 and the stuffing box 150. By placing the support sleeve 190 between the top of the inner tube 120 and the stuffing box 150, the structural stability between the stuffing box 150 and the inner tube 120 is improved.

[0067] Furthermore, by forming a tight fit between the annular throat 191 and the auxiliary impeller 200, the size of the gap between the annular throat 191 and the auxiliary impeller 200 is reduced, effectively reducing the water flow rate. This means that most of the water needs to be pressurized by the auxiliary impeller 200 before it can be transported downwards, thereby increasing the water pressure generated by the auxiliary impeller 200. This ensures that the flushing water can circulate more efficiently and enhances the flushing effect on key components.

[0068] In the embodiments of this utility model, such as Figure 1 and Figure 4 In the embodiment shown, the first support structure further includes a stuffing box 150 fixed to the inner tube 120 and sleeved on the first bushing 160, and a sealing packing 151 disposed between the stuffing box 150 and the first bushing 160. A first guide bearing 170 is disposed on the stuffing box 150 and below the sealing packing 151. The area between the sealing packing 151 and the first guide bearing 170 forms a second suction zone 20. The stuffing box 150 is provided with a second water inlet hole 114 for connecting the second suction zone 20 and the second pipeline 340. A water guide groove is provided between the first guide bearing 170 and the first bushing 160 to guide the water in the first suction zone 10 to the second suction zone 20.

[0069] By setting the first water inlet 113, filtered high-pressure flushing water can be introduced into the stuffing box 150, thereby continuously flushing and lubricating the sealing packing 151 and the first guide bearing 170 below the sealing packing 151 in the stuffing box 150. This effectively removes the heat generated by friction and prevents the accumulation of impurities, significantly improving the sealing performance and the reliability of the operation of the first guide bearing 170, extending the service life of the sealing packing 151 and the first guide bearing 170, reducing the maintenance frequency, and ensuring the long-term stable operation of the equipment.

[0070] Furthermore, by providing a second water inlet hole 114 on the support sleeve 190, clean water in the second pipeline 340 can enter the inner pipe 120 through the second water inlet hole 114, which helps to increase the amount of flushing water entering the pipe, thereby improving the lubrication and flushing effect.

[0071] In the embodiments of this utility model, such as Figure 1In the embodiment shown, the self-flushing water circuit structure also includes a third pipe 360, which connects to the first pipe 310 and the second pipe 340 and is located downstream of the first control valve 320 and the second control valve 350.

[0072] The third pipe 360 ​​enables water flow between the first pipe 310 and the second pipe 340, allowing clean water to be simultaneously delivered to the first inlet 113 and the second inlet 114, thus forming a multi-point synchronous water intake structure, which effectively improves the overall water intake volume and water pressure stability.

[0073] In the embodiments of this utility model, such as Figure 1 and Figure 4 The embodiment shown includes a pump with a self-flushing structure, which further includes a water storage tank 180 disposed above the stuffing box 150 for collecting water that leaks upward through the stuffing box 150.

[0074] The water storage tank 180 collects leaked water from the stuffing box 150, effectively preventing leaked water from entering other parts of the equipment and causing pollution or damage, thus improving the operational safety and reliability of the equipment. The water storage tank 180 can be connected to external pipelines to discharge leaked water.

[0075] In the embodiments of this utility model, such as Figure 2 and Figure 3 In the embodiment shown, the pump is a vertical cantilever pump. The support structure includes a second support structure in the region between the auxiliary impeller 200 and the main impeller 140. The second support structure includes at least one second bushing 500 disposed on the pump shaft 130 and at least one second guide bearing 600 correspondingly disposed between the inner tube 120 and the second bushing 500. A friction pair is formed between the second bushing 500 and the second guide bearing 600. A water guide groove is provided between the second guide bearing 600 and the second bushing 500 to guide water from the side of the second support structure away from the main impeller 140 to the side of the second support structure closer to the main impeller 140.

[0076] Preferably, multiple second bushings 500 and second guide bearings 600 are correspondingly provided. Multiple sets of second bushings 500 and second guide bearings 600 form multiple friction pairs, thereby better supporting the pump shaft 130 and ensuring the operational stability of the pump shaft 130. A support frame is provided inside the inner tube 120 to support the second guide bearing 600, thereby ensuring the installation stability of the second guide bearing 600.

[0077] Furthermore, the pump equipment also includes an outlet section 700, which is located on the top of the pump body 110 and fitted onto the outside of the stuffing box 150. A motor base 800 is also provided on the top of the outlet section 700, and a drive motor 900 is installed in the motor base 800. The drive motor 900 is connected to the pump shaft 130 through a transmission structure.

[0078] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0079] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A pump with a self-flushing structure, characterized in that, include: A pump body, wherein the pump body is provided with an inlet and an outlet; A pump shaft, which is rotatably disposed within the pump body; The main impeller is tractably connected to the pump shaft and is used to drive water from the inlet through the pump body to the outlet. The self-flushing structure includes an inner tube inserted into the pump body and an auxiliary impeller disposed on the pump shaft. The auxiliary impeller is spaced at a preset distance from the main impeller and placed in the inner tube. The auxiliary impeller rotates synchronously with the pump shaft. A self-flushing water circuit structure, wherein the self-flushing water circuit structure connects the liquid outlet and the inner tube; A support structure is provided between the inner tube and the pump shaft, and at least one friction pair is formed between the support structure and the pump shaft to form a rotational fit. The auxiliary impeller is used to flush and lubricate the friction pair with water.

2. The pump with a self-flushing structure as described in claim 1, characterized in that, The auxiliary impeller generates driving pressure on the side facing the main impeller and driving suction on the side away from the main impeller. The self-flushing water channel structure is connected to the side of the auxiliary impeller that generates driving suction. The support structure includes a first support structure disposed on the side of the auxiliary impeller away from the main impeller, and one end of the pump shaft passes through the first support structure for connection with the motor shaft. The first support structure includes a first bushing fixedly sleeved on the pump shaft and a first guide bearing sleeved on the outside of the first bushing, wherein the first guide bearing and the first bushing form a friction pair; Along the axial direction of the pump shaft, a first suction zone is formed between the first guide bearing and the auxiliary impeller. The first suction zone is used to connect the self-flushing water circuit structure and the inner pipe.

3. The pump with a self-flushing structure as described in claim 2, characterized in that, An auxiliary impeller bushing is fitted on the pump shaft, and the auxiliary impeller is fixed on the auxiliary impeller bushing. The auxiliary impeller is a booster impeller or a propeller-type impeller; The auxiliary impeller bushing is an integral structure with the first bushing.

4. The pump with a self-flushing structure as described in claim 1, characterized in that, The self-flushing water circuit structure includes a first pipeline and two first control valves spaced apart on the first pipeline. The first pipeline connects the outlet to the inner pipe, and a first filter is provided on the first pipeline between the two first control valves.

5. The pump with a self-flushing structure as described in claim 4, characterized in that, The pump with a self-flushing structure also includes a differential pressure transmitter connected in parallel with the first filter, the differential pressure transmitter being used to detect the pressure difference across the first filter.

6. The pump with a self-flushing structure as described in claim 4, characterized in that, The self-flushing water circuit structure also includes a second pipeline connected in parallel with the first pipeline, and two second control valves spaced apart on the second pipeline. The second pipeline is used to connect the liquid outlet and the inner pipe, and a second filter is provided on the second pipeline between the two second control valves.

7. The pump with a self-flushing structure as described in claim 6, characterized in that, The self-flushing water circuit structure also includes a third pipeline, which connects the first pipeline and the second pipeline and is located downstream of the first control valve and the second control valve.

8. The pump with a self-flushing structure as described in claim 2, characterized in that, The first support structure also includes a support sleeve that is detachably fixed to the inner tube and sleeved on the pump shaft. The circumferential sidewall of the support sleeve is provided with a first water inlet hole for connecting the first suction zone and the first pipeline. The lower end of the support sleeve forms an annular throat, and the auxiliary impeller is rotatably disposed at the annular throat position.

9. The pump with a self-flushing structure as described in claim 2, characterized in that, The first support structure further includes a stuffing box fixed to the inner tube and sleeved on the first bushing, and a sealing packing disposed between the stuffing box and the first bushing. The first guide bearing is disposed on the stuffing box and positioned below the sealing packing. The area between the sealing packing and the first guide bearing forms a second suction zone. The stuffing box is provided with a second water inlet hole for connecting the second suction zone and the second pipeline. A water guide groove is provided between the first guide bearing and the first bushing to guide the water in the first suction zone to the second suction zone.

10. The pump with a self-flushing structure as described in claim 9, characterized in that, The pump with a self-flushing structure also includes a water storage tank disposed above the stuffing box, the water storage tank being used to collect water that leaks upward through the stuffing box.

11. The pump with a self-flushing structure as described in claim 1, characterized in that, The pump is a vertical cantilever pump. The support structure includes a second support structure in the region between the auxiliary impeller and the main impeller. The second support structure includes at least one second bushing disposed on the pump shaft and at least one second guide bearing disposed between the inner tube and the second bushing. A friction pair is formed between the second bushing and the second guide bearing. A water guide groove is provided between the second guide bearing and the second bushing to guide water from the side of the second support structure away from the main impeller to the side of the second support structure closer to the main impeller.

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