Adjustable bridge concentric water distributor

Abstract

The present application relates to the technical field of oilfield water injection, in particular to an adjustable bridge type concentric water distributor, which comprises a water distributor main body, a water outlet arranged in the middle of the water distributor main body, an adjusting sleeve arranged in the interior of the water distributor main body, an extrusion assembly arranged in the inner side of the water outlet, a water injection assembly sleeved in the inner side of the water outlet, a middle shaft assembly bearing connected with the extrusion assembly, and a flow guide vane arranged on the outer side of the middle shaft assembly; the middle shaft assembly is sleeved in the inner side of the water injection assembly, and the flow guide vane is in the shape of a twisted sheet. The arrangement of the extrusion assembly and the middle shaft assembly is conducive to effectively cleaning the microbial film attached to the inner wall of the water outlet, destroying the attachment environment of the microorganisms, inhibiting the attachment of the microorganisms, effectively reducing the corrosion of the microbial film to the water outlet of the adjustable bridge type concentric water distributor, and ensuring the service life of the adjustable bridge type concentric water distributor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oilfield water injection, in particular to an adjustable bridge type concentric water distributor. BACKGROUND

[0002] In the process of oil exploitation, at the initial stage of oilfield development, the formation natural energy can make the crude oil flow, but as the exploitation proceeds, the formation pressure is continuously reduced due to the production of crude oil, resulting in a continuous decrease in oil well production. In order to maintain the pressure at a reasonable level, a water distributor is used to inject water into the oil layer. When the subsea well is used for water injection into the oil layer, a channel and control are provided through the underwater Christmas tree, and an adjustable bridge type concentric water distributor is used in combination.

[0003] The adjustable bridge type concentric water distributor refers to a concentric design in which the water flow channel coincides with the central axis of the water distribution pipe column based on the water distributor, which reduces water flow resistance and improves water injection efficiency. A bridge type flow passage is used to effectively eliminate the interference between each injection layer, and an intelligent measuring and adjusting instrument is used to adjust the size of the adjustable water nozzle, so as to change the water injection flow area and realize the adjustment of the water injection amount. Therefore, the adjustable bridge type concentric water distributor, which can accurately control the water injection amount into different oil layers and effectively improve the water injection efficiency, is suitable for use in multi-layer separate injection wells, high-inclination wells, deep wells and produced water injection wells, and can be further combined with the underwater Christmas tree to improve the reliable management of water injection into the oil layer.

[0004] In the process of using the adjustable bridge type concentric water distributor, the water outlet of the adjustable bridge type concentric water distributor is in a wet state for a long time, and the temperature and humidity conditions in the marine environment are more suitable for the growth of microorganisms such as sulfate-reducing bacteria and iron bacteria. In addition, the water flow at the water outlet contains certain nutrients, which provide nutrients for the growth and reproduction of microorganisms. The excessive reproduction of microorganisms will adhere to the water outlet of the water distributor and form a membrane structure, and the microbial membrane will gradually accumulate to form a layer of biofilm at the water outlet. As the biofilm thickens, it will gradually block the water outlet, reducing the flow rate of the water flow. At the same time, the acidic substances produced by the microbial membrane metabolism will corrode the metal parts of the water distributor, shortening the service life of the equipment.

[0005] In the prior art, the microbial membrane generated at the water outlet of the adjustable bridge type concentric water distributor is mainly treated by water flow impact and bactericide cleaning. However, in actual use, water flow impact can effectively remove the surface layer of the microbial membrane, but the cleaning effect on the deep layer of the microbial membrane is limited, and microorganisms are easily left, resulting in incomplete removal of microorganisms. The use of bactericides can effectively remove the microbial membrane in the early stage of cleaning, but after long-term use, microorganisms may develop drug resistance, and some bactericides may increase the risk of equipment corrosion, affecting the service life of the equipment.

[0006] Therefore, in order to effectively reduce the corrosion of the microbial membrane to the adjustable bridge type concentric water distributor and ensure the service life of the adjustable bridge type concentric water distributor, an adjustable bridge type concentric water distributor is provided. SUMMARY

[0007] The adjustable bridge type concentric water distributor solves the problem of excessive proliferation of microorganisms at the water outlet of the adjustable bridge type concentric water distributor, and through the water flow impact on the guide vane, the guide vane scrapes the inner wall of the water outlet, and through the extrusion assembly, the attachment of microorganisms is effectively inhibited, and through the rotation of the water injection assembly, when the spiral water flow is injected, some impurities and cleaned microbial membranes in the water body are discharged, effectively reducing the corrosion of the microbial membrane to the adjustable bridge type concentric water distributor, thereby ensuring the service life of the adjustable bridge type concentric water distributor.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0009] The adjustable bridge type concentric water distributor comprises a water distributor main body, a water outlet formed in the middle of the water distributor main body, an adjusting sleeve installed inside the water distributor main body, an extrusion assembly installed on the inner side of the water outlet, a water injection assembly sleeved on the inner side of the water outlet, a middle shaft assembly bearing connected with the extrusion assembly, and a guide vane arranged on the outer side of the middle shaft assembly.

[0010] In the above-mentioned scheme, the guide vane is driven to rotate by the water flow impact, and the inner wall of the water outlet is processed, and at the same time, the water flow is spirally circulated in the water outlet and impacts the inner plate, and under the influence of water pressure, the baffle separates from the outer fixed ring, water injection is carried out, and excessive proliferation of microorganisms in the water outlet is effectively inhibited, and under the condition of spiral water injection, some impurities can be effectively thrown out by centrifugal force, avoiding the problem of accumulation of impurities in the water outlet, causing the water outlet to be blocked.

[0011] Preferably, the extrusion assembly comprises a fixed frame fixedly installed on the inner side of the water outlet, a disc-shaped spring plate installed on the middle shaft assembly, a connecting plate installed on the inner side of the guide vane, a clamping block fixedly installed on the inner side of the connecting plate, and a fixed rubber ring clamped on the clamping block.

[0012] In the scheme, the water flow drives the guide vane to rotate to clean the inner wall of the water outlet, and the guide vane is long-term scraped on the inner wall of the water outlet, and the long-term scraping produces abrasion, which makes the guide vane unable to effectively clean the microbial film on the inner wall of the water outlet, therefore, the disc spring sheet and the fixed rubber ring can effectively separate the connecting sheet and the guide vane, so that the guide vane is always attached to the inner wall of the water outlet, to ensure the cleaning effect of the guide vane on the inner wall of the water outlet.

[0013] Preferably, the water injection assembly comprises an outer fixed ring sleeved and installed on the inner side of the water outlet, a limiting frame fixedly installed on the inner side of the outer fixed ring, an inner plate sleeved on the middle shaft assembly, a connecting rod installed on the inner side of the limiting frame, a limiting spring sleeved on the outer side of the connecting rod, a baffle installed on the inner plate, and a clamping groove opened in the middle of the baffle; the baffle is fixedly connected with the connecting rod, the connecting rod is arrayed on the edge of the baffle, the limiting spring is located on the inner side of the limiting frame, the inner side of the baffle is sleeved with the middle shaft assembly, the cross section of the connecting rod is T-shaped, and the limiting spring is located on the middle of the outer surface of the connecting rod, one end of the limiting spring is attached to the inner side of the limiting frame, and the other end is attached to the protruding part of the connecting rod, the side of the inner plate close to the inner side of the water outlet is a smooth curved surface, the outer fixed ring is closely attached to the inner plate, the middle shaft assembly comprises a central shaft bearing-connected with the fixed frame, a clamping block installed on one end of the central shaft, and a limiting clamping groove opened in the clamping block; the clamping block is located on the end of the central shaft close to the baffle, the limiting clamping groove is located on the side of the inner plate close to the fixed frame, the clamping block is installed on the inner side of the limiting clamping groove, the baffle is movably sleeved with the clamping block on the central shaft through the clamping groove, the side of the guide vane close to the central shaft is fixedly connected with the connecting sheet, and the side of the guide vane away from the central shaft is attached to the inner wall of the water outlet.

[0014] In the scheme, the transmission of the central shaft can make the inner plate rotate synchronously when water injection, and the smooth inner wall on the inner side of the inner plate can effectively inhibit the attachment of microorganisms, and the water flow guided by the rotation of the guide vane can effectively impact the surface of the inner plate, further reducing the possibility of microbial attachment, and the smooth curved surface on the surface edge of the inner plate and the surface edge close to the inner plate of the outer fixed ring can inhibit the attachment of impurities and microorganisms, ensuring the closed sealing degree when the equipment is not water injection, and the rotation of the water injection assembly can shake out the impurities and microbial film in the water body, reducing the possibility of impurity accumulation and microbial film attachment, effectively improving the self-cleaning effect of the water outlet, and the baffle, the connecting rod and the limiting spring constitute a simple anti-reflux component, which can effectively inhibit the reflux caused by unstable external water pressure.

[0015] Compared with the prior art, the beneficial effects of the present application are:

[0016] 1. The present invention drives the guide plate to rotate through the arrangement of the extrusion component and the central axis component, and at the same time promotes the water flow to rotate in a spiral manner, which can effectively scrape and clean the inner wall of the water outlet. At the same time, the spiral rotation of the water flow can increase the turbulence of the water flow, destroy the attachment environment of microorganisms on the inner wall, effectively inhibit the attachment of impurities such as scale to the inner wall of the water outlet, and reduce the possibility of microbial attachment. The guide plate can also reduce the turbulence of the water flow at the water outlet, reduce the flow resistance, improve the flow efficiency, and is conducive to effectively cleaning the microbial film attached to the inner wall of the water outlet, while destroying the attachment environment of microorganisms, inhibiting the attachment of microorganisms, and effectively reducing the corrosion of the microbial film on the water outlet of the adjustable bridge-type concentric water distributor, thereby ensuring the service life of the adjustable bridge-type concentric water distributor.

[0017] 2. The present invention compensates for the wear of the guide plate caused by long-term contact with the inner wall of the water outlet by setting the extrusion component and the central axis component, squeezing the connecting plate by the disc spring sheet, and pulling the clamping block by the fixed rubber ring, so that the guide plate always fits the inner wall of the water outlet. At the same time, the guide plate will be slightly deformed under the long-term impact of some large-flow water flow. The elasticity of the disc spring sheet can be used to squeeze the connecting plate, so that the guide plate always fits the inner wall of the water outlet. The vibration generated by the guide plate due to the unstable external water flow can also be buffered by the disc spring sheet, avoiding frequent vibration affecting the fitting accuracy of the guide plate and the water outlet, ensuring the cleaning effect of the guide plate on the water outlet, and avoiding impurities and microbial films from accumulating at the water outlet of the water distributor, affecting the water injection effect of the water outlet of the water distributor.

[0018] 3. The present invention, through the arrangement of the water injection assembly and the central axis assembly, adopts a smooth curved surface on the inner wall of the inner plate, and is driven and rotated by the central axis, so that the water flow can form a spiral flow on the inner side of the outer fixed ring. After the baffle is opened by the water pressure, spiral water injection can be achieved, and at the same time, impurities inside the water outlet are effectively discharged by centrifugal force. The combination of the connecting rod and the limit spring can make the baffle automatically open and close under the influence of water pressure. When the external water pressure is unstable, such as when the external pressure is higher than the sum of the water pressure and the centrifugal force of the rotation of the central axis assembly, the baffle is quickly pulled by the limit spring to achieve closure, avoiding backflow. When the sum of the external pressure and the elastic force of the limit spring is lower than the sum of the water pressure and the centrifugal force of the rotation of the central axis assembly, the water flow can push the baffle open to inject water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the water distributor of the present invention;

[0020] Figure 2 Schematic diagram of the cross-sectional structure of the adjustment sleeve of the present invention;

[0021] Figure 3 It is a schematic structural diagram of the extrusion assembly and the water injection assembly of the present invention;

[0022] Figure 4 It is a schematic structural diagram of the extrusion assembly of the present invention;

[0023] Figure 5 Schematic diagram of the internal structure of the connecting piece of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the water injection assembly of the present invention;

[0025] Figure 7 Schematic diagram of the cross-sectional structure of the outer fixing ring and the limiting frame of the present invention;

[0026] Figure 8 It is a schematic diagram of the cross-sectional structure of the inner plate and baffle of the present invention.

[0027] In the figure: 1. Water distributor body; 2. Water outlet; 3. Adjustment sleeve; 4. Extrusion assembly; 401. Fixing bracket; 402. Disc spring; 403. Connecting plate; 404. Clamping block; 405. Fixed rubber ring; 5. Water injection assembly; 501. External fixing ring; 502. Limiting bracket; 503. Inner plate; 504. Connecting rod; 505. Limiting spring; 506. Baffle; 507. Clamping slot; 6. Central axis assembly; 601. Central axis; 602. Clamping block; 603. Limiting slot; 7. Guide plate. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of the present invention.

[0029] See also Figures 1 to 8 The present invention provides an adjustable bridge-type concentric water distributor, and the technical solution is as follows:

[0030] The adjustable bridge type concentric water distributor comprises a water distributor body 1, a water outlet 2 arranged in the middle of the water distributor body 1, an adjusting sleeve 3 arranged in the water distributor body 1, a pressing assembly 4 arranged in the inner side of the water outlet 2, a water injection assembly 5 sleeved in the inner side of the water outlet 2, a middle shaft assembly 6 bearing connected with the pressing assembly 4, and a guide vane 7 arranged outside the middle shaft assembly 6; the middle shaft assembly 6 is sleeved in the inner side of the water injection assembly 5, the guide vane 7 is in the shape of a twisted sheet, the pressing assembly 4 can press and open the guide vane 7 to be combined with the inner wall of the water outlet 2 after the guide vane 7 is worn, the water flow drives the guide vane 7 to rotate and drives the middle shaft assembly 6 to rotate through the pressing assembly 4, and the middle shaft assembly 6 drives the water injection assembly 5 to rotate; the adjusting mode of the adjustable bridge type concentric water distributor is that, after the water distributor is lowered to a suitable position, the measuring and adjusting instrument is placed in the inner side of the adjusting sleeve 3 and is clamped with the clamping groove on the adjusting sleeve 3, the adjusting sleeve 3 is driven to rotate through the rotation of the measuring and adjusting instrument, the up and down position of the adjusting sleeve 3 is adjusted through the transmission thread between the adjusting sleeve 3 and the positioning sleeve, and the opening size of the water outlet 2 is adjusted.

[0031] As an embodiment of the present application, refer to Figures 3 to 5 The pressing assembly 4 comprises a fixing frame 401 arranged in the inner side of the water outlet 2, a disc-shaped spring sheet 402 arranged on the middle shaft assembly 6, a connecting sheet 403 arranged in the inner side of the guide vane 7, a clamping block 404 fixed in the inner side of the connecting sheet 403, and a fixed rubber ring 405 clamped on the clamping block 404, the side of the disc-shaped spring sheet 402 close to the clamping block 404 is combined with the inner side of the connecting sheet 403, the outer surface of the clamping block 404 is provided with a groove matched with the fixed rubber ring 405, the fixed rubber ring 405 is sleeved in the groove of the outer surface of the clamping block 404, the side of the guide vane 7 close to the central shaft 601 is fixedly connected with the connecting sheet 403, and the side of the guide vane 7 away from the central shaft 601 is combined with the inner wall of the water outlet 2; the side of the disc-shaped spring sheet 402 away from the connecting sheet 403 is fixed with the central shaft 601, the disc-shaped spring sheet 402 is always in a compressed state after being arranged, continuously presses the connecting sheet 403, the inner side of the connecting sheet 403 is fixedly connected with the clamping block 404, the clamping block 404 is clamped in the inner side of the limiting clamping groove 603, the limiting clamping groove 603 limits the clamping block 404, the central shaft 601 is also driven to rotate through the clamping block 404 and the limiting clamping groove 603 when the guide vane 7 is driven by the water flow, and the setting of the fixed rubber ring 405 can inhibit the pressing of the disc-shaped spring sheet 402, the force between the two sides is in a balanced state when the outer side of the guide vane 7 is combined with the inner wall of the water outlet 2, the disc-shaped spring sheet 402 will press the connecting sheet 403 to slightly open after the guide vane 7 is worn, so that the guide vane 7 is combined with the inner wall of the water outlet 2.

[0032] As an embodiment of the present application, refer toFigures 6 to 8 The water injection assembly 5 comprises an outer fixed ring 501 movably sleeved in the inner side of the water outlet 2, a limiting frame 502 sleeved in the inner side of the outer fixed ring 501, an inner plate 503 sleeved on the middle shaft assembly 6, a connecting rod 504 sleeved in the inner side of the limiting frame 502, a limiting spring 505 sleeved on the outer side of the connecting rod 504, a baffle 506 sleeved on the inner plate 503, and a clamping groove 507 formed in the middle of the baffle 506. The baffle 506 is fixedly connected with the connecting rod 504, the connecting rod 504 is arrayed on the edge of the baffle 506, the limiting spring 505 is located on the inner side of the limiting frame 502, the inner side of the baffle 506 is sleeved with the middle shaft assembly 6, the middle shaft assembly 6 comprises a center shaft 601 bearing connected with the fixed frame 401, a clamping block 602 sleeved on one end of the center shaft 601, and a limiting clamping groove 603 formed in the clamping block 602. The clamping block 602 is located on one end of the center shaft 601 close to the baffle 506, the limiting clamping groove 603 is located on one side of the inner plate 503 close to the fixed frame 401, one side of the inner plate 503 close to the inner side of the water outlet 2 is a smooth curved surface, the outer fixed ring 501 is closely attached to the inner plate 503, the clamping block 404 is sleeved in the limiting clamping groove 603, and the baffle 506 is movably sleeved with the clamping block 602 on the center shaft 601 through the clamping groove 507. The inner side of the clamping groove 507 is sleeved on the outer side of the limiting clamping groove 603, the clamping groove 507 is matched with the limiting clamping groove 603, the baffle 506 is driven to rotate by the clamping block 602 when the center shaft 601 is driven to rotate by the flow guide piece 7, and the baffle 506 and the inner plate 503 form a sealed space. The inner plate 503 and the baffle 506 are hollow to reduce the weight of the inner plate 503 and the baffle 506, and the driving force of the center shaft 601 on the baffle 506. The limiting spring 505 is arranged to close the outer fixed ring 501 and the baffle 506 when the external pressure is greater than the internal water pressure, so as to prevent the external water flow and external sand and other sundries from flowing back, and affect the stability of the equipment. When the sum of the water supply pressure and the rotational centrifugal force of the baffle 506 is greater than the sum of the external pressure and the elastic force of the limiting spring 505, the baffle 506 can be pushed away to realize water injection, so as to ensure the stability of water injection.

[0033] Working principle: when water injection is performed, the water flow passes through the flow guide piece 7, drives the flow guide piece 7, and forms a spiral water flow under the influence of the flow guide piece 7. The flow guide piece 7 rotates to scrape and clean the inner wall of the water outlet 2. At the same time, the extrusion assembly 4 drives the middle shaft assembly 6 to rotate, and the middle shaft assembly 6 drives the baffle 506 to rotate. The water pressure of the injected water extrudes the inner plate 503, so that the inner plate 503 is separated from the outer fixed ring 501, and water injection is realized.

[0034] Specifically, when water is injected, the water flows into the water outlet 2 and impacts the twisted part of the guide plate 7 when passing through the guide plate 7, causing the guide plate 7 to rotate. In this process, the water flow will also be driven to form a spiral flow water flow under the influence of the rotation of the guide plate 7. The rotation of the guide plate 7 will scrape and clean the inner wall of the water outlet 2, avoiding excessive reproduction of microorganisms to form a microbial film, erosion of the water outlet 2, and excessive reproduction leading to accumulation and clogging of the water outlet 2. At the same time, the spiral flow water flow will flush the inner wall of the water outlet 2, destroying the attachment environment of the microorganisms on the inner wall, making it difficult for the microorganisms to stably attach to the inner wall, and also avoiding the accumulation of impurities in the water on the inner wall of the water outlet 2.

[0035] When the guide plate 7 is affected by the water flow and rotates, it will drive the connecting plate 403, and the connecting plate 403 will drive the clamping block 404. The clamping block 404 will drive the central shaft 601 to rotate through the limiting clamping groove 603, and the central shaft 601 will drive the baffle 506 to rotate through the clamping of the clamping block 602 and the clamping groove 507. Therefore, under the support of centrifugal force, combined with the water pressure, the inner plate 503 is squeezed and impacted to prevent microorganisms from adhering to the surface of the inner plate 503. The inner plate 503 is affected by the water pressure and drives the connecting rod 504 to squeeze the limiting spring 505, causing the limiting spring 505 to deform, so that the inner plate 503 and the baffle 506 are separated from the outer fixed ring 501. The drain port is opened, and the water is injected into the oil layer in a spiral flow manner. In this process, the spiral flowing water will use centrifugal force to preferentially discharge some impurities and other debris in the water body, thereby avoiding impurity accumulation and affecting the water injection effect.

[0036] When the guide plate 7 is in contact with the inner wall of the water outlet 2 for a long time, the end of the guide plate 7 will be worn, so that the end of the guide plate 7 cannot effectively fit with the inner wall of the water outlet 2. The disc spring piece 402 will squeeze the connecting piece 403, so that the connecting piece 403 drives the clamping block 404 to move outward from the inside of the limiting groove 603 until the guide plate 7 fits with the inner wall of the water outlet 2. The squeezing of the disc spring piece 402 ensures the stability of the contact between the guide plate 7 and the inner wall of the water outlet 2.

[0037] Although the embodiments of the present invention have been described, it will be apparent to those skilled in the art that various variations and modifications may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An adjustable bridge-type concentric water distributor, comprising a water distributor body (1), a water outlet (2) provided in the middle of the water distributor body (1), and an adjustment sleeve (3) installed inside the water distributor body (1), characterized in that: The invention also includes an extrusion assembly (4) installed on the inner side of the water outlet (2), a water injection assembly (5) sleeved on the inner side of the water outlet (2), a central axis assembly (6) connected to the bearing of the extrusion assembly (4), and a guide plate (7) arranged on the outer side of the central axis assembly (6); the central axis assembly (6) is sleeved on the inner side of the water injection assembly (5), and the guide plate (7) is in the shape of a twisted plate. After the guide plate (7) is worn, the extrusion assembly (4) can squeeze the guide plate (7) open and fit it with the inner wall of the water outlet (2). The water flow drives the guide plate (7) to rotate and drives the central axis assembly (6) to rotate through the extrusion assembly (4), and the central axis assembly (6) drives the water injection assembly (5) to rotate. The extrusion assembly (4) comprises a fixing frame (401) mounted on the inner side of the water outlet (2), a disc spring sheet (402) mounted on the central axis assembly (6), a connecting sheet (403) mounted on the inner side of the guide sheet (7), a clamping block (404) fixed on the inner side of the connecting sheet (403), and a fixing rubber ring (405) clamped on the clamping block (404); The side of the disc spring sheet (402) close to the clamping block (404) is fitted with the inner side of the connecting piece (403), and a groove adapted to fit the fixed rubber ring (405) is provided in the middle of the outer surface of the clamping block (404), and the fixed rubber ring (405) is sleeved in the groove on the outer surface of the clamping block (404).

2. The adjustable bridge-type concentric water distributor according to claim 1, characterized in that: The water injection assembly (5) comprises an outer fixing ring (501) mounted on the inner side of the water outlet (2), a limiting frame (502) mounted on the inner side of the outer fixing ring (501), an inner plate (503) sleeved on the central axis assembly (6), a connecting rod (504) mounted on the inner side of the limiting frame (502), a limiting spring (505) sleeved on the outer side of the connecting rod (504), a baffle (506) mounted on the inner plate (503), and a clamping groove (507) provided in the middle of the baffle (506).

3. The adjustable bridge-type concentric water distributor according to claim 2, characterized in that: The baffle (506) is fixedly connected to the connecting rod (504), the connecting rod (504) is distributed in an array on the edge of the baffle (506), the limit spring (505) is located on the inner side of the limit frame (502), and the inner side of the baffle (506) is sleeved with the central axis component (6).

4. The adjustable bridge-type concentric water distributor according to claim 1, characterized in that: The central axis assembly (6) comprises a central axis (601) connected to a bearing of a fixing frame (401), a clamping block (602) mounted on one end of the central axis (601), and a limiting clamping slot (603) provided on the clamping block (602).

5. The adjustable bridge-type concentric water distributor according to claim 4, characterized in that: The clamping block (602) is located at one end of the central axis (601) close to the baffle (506), and the limiting clamping slot (603) is located at one side of the inner plate (503) close to the fixing frame (401).

6. The adjustable bridge-type concentric water distributor according to claim 2, characterized in that: The inner plate (503) has a smooth curved surface on one side close to the inner side of the water outlet (2), and the outer fixing ring (501) is tightly fitted to the inner plate (503).

7. The adjustable bridge-type concentric water distributor according to claim 6, characterized in that: The clamping block (404) is installed on the inner side of the limiting clamping slot (603), and the baffle (506) is movably connected to the clamping block (602) on the central axis (601) through the clamping slot (507).

8. The adjustable bridge-type concentric water distributor according to claim 7, characterized in that: The side of the guide plate (7) close to the central axis (601) is fixedly connected to the connecting plate (403), and the side of the guide plate (7) away from the central axis (601) is in contact with the inner wall of the water outlet (2).

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