Full-locking oil-submerged pump

Abstract

The invention relates to the technical field of oil-submerged pumps, and discloses a full-locking oil-submerged pump which comprises a pump shell. The pump shaft is rotatably assembled in the pump shell; the rotating piece is arranged on the pump shaft in a sleeving manner and rotates along with the pump shaft; the fixing piece is assembled in the pump shell and arranged outside the pump shaft in a sleeving mode, and the fixing piece comprises a lower pump head assembly, a lower pump head assembly and a lower pump head assembly, and a wedge-shaped groove is formed in the upper end face of the lower pump head assembly; the lower end face of the bottom guide shell is provided with wedge-shaped teeth matched with the wedge-shaped grooves, the upper end of the bottom guide shell is provided with rotation stopping teeth, the lower end of the guide shell is provided with rotation stopping grooves matched with the rotation stopping teeth of the bottom guide shell, and the upper end of the guide shell is also provided with rotation stopping teeth. The rotation stopping teeth and the rotation stopping grooves which are meshed with each other are arranged on the convex spigots of the guide shells, and the thin-wall fixing sleeves are sleeved outside the joints of the adjacent guide shells, so that the reverse torque of fluid acting on the guide vanes is effectively transmitted and decomposed by utilizing the side contact of the tooth grooves, and the relative rotation between the guide shells at all stages is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of submersible pumps, in particular to a full locking submersible pump. BACKGROUND

[0002] Submersible electric pump is a widely used artificial lifting device in oilfield exploitation. It provides powerful lifting power for oil wells through the form of multi-stage centrifugal pump series work. Inside the pump, the impeller rotates at high speed to push the liquid, and at the same time, it will generate a huge counter torque on the stationary guide shell. How to effectively suppress this torque and prevent the guide shell from rotating with the impeller is a core technical problem that must be solved to ensure the long-term stable operation of the pump set.

[0003] The most similar implementation scheme in the industry at present is to rely on axial pre-tightening force to generate friction force to prevent rotation. This way, when the pump is assembled, a predetermined axial compression amount is applied to the guide shell stack to make the end faces of each guide shell tightly fit. This compression force makes the guide shell and the guide shell generate enough static friction. The friction is used to resist the reverse fluid torque generated when the impeller rotates, so as to keep the guide shell stationary.

[0004] However, this scheme that simply relies on compression amount to prevent rotation has many inherent technical defects. First of all, the accurate compression amount is difficult to determine. Its value often depends on theoretical calculation and experience, but it is actually affected by the changes of the guide shell structure and the elastic modulus of the material, so it is difficult to give an accurate value. If the compression amount is too large, it is easy to cause plastic deformation of the guide shell, and even the guide shell may be crushed; the deformation of the working surface will also excessively reduce the axial movement space of the impeller, causing wear. On the contrary, insufficient compression amount directly leads to failure of rotation prevention. The guide shell will rotate with the impeller, and the performance of the pump will decrease sharply, and the high temperature generated by local friction will further accelerate the damage of internal parts. In addition, when the submersible pump is running at an ultra-high speed in pursuit of higher capacity, the fluid reaction torque increases dramatically, and the possibility of guide shell rotation also increases. Therefore, the industry urgently needs a more reliable mechanical locking structure to fix all guide shells as a rigid whole and firmly limit them at both ends of the pump body, thereby fundamentally solving the problem of guide shell rotation. SUMMARY

[0005] In view of the defects of the prior art, the present application provides a full locking submersible pump, which solves the problem of unreliable structure and easy failure caused by the fact that the existing submersible pump only relies on compression friction to prevent the guide shell from rotating.

[0006] To achieve the above purpose, the present application is implemented by the following technical scheme: a full locking submersible pump, comprising: a pump shell; a pump shaft rotatably assembled in the pump shell; a rotating part sleeved on the pump shaft and rotating with the pump shaft; a fixing member assembled in the pump housing and sleeved on the pump shaft, the fixing member comprising: a lower pump head assembly, the upper end surface of which is provided with a wedge-shaped slot; a bottom guide housing, the lower end surface of which is provided with a wedge-shaped tooth matched with the wedge-shaped slot of the lower pump head assembly, and the upper end of which is provided with a rotation-stopping tooth; a guide housing, the lower end of which is provided with a rotation-stopping slot matched with the rotation-stopping tooth of the bottom guide housing, and the upper end of which is also provided with a rotation-stopping tooth, and a plurality of the guide housings are connected in sequence through the rotation-stopping tooth at the upper end of one guide housing and the rotation-stopping slot at the lower end of the next guide housing; a compression ring, which is provided with a rotation-stopping slot matched with the rotation-stopping tooth at the upper end of the last guide housing; a locking sleeve, which is connected with the pump housing through threads to compress the compression ring, and is provided with a threaded through hole; a cylindrical end fixing screw, which penetrates through the threaded through hole of the locking sleeve and abuts against the compression ring to limit the relative rotation between the locking sleeve and the compression ring.

[0007] Preferably, the upper and lower sides of the guide housing are convex, the upper end of the guide housing is uniformly provided with convex rotation-stopping teeth along the circumference, the lower end of the guide housing is uniformly provided with rotation-stopping slots along the circumference, and the number of the rotation-stopping teeth is the same as that of the rotation-stopping slots and the width of the rotation-stopping teeth is matched with that of the rotation-stopping slots.

[0008] Preferably, the submersible pump further comprises a fixing sleeve, which is a thin-walled cylindrical part, the inner diameter of which is matched with the convex stop of the guide housing, and the fixing sleeve is sleeved on the outer side of the rotation-stopping teeth and the rotation-stopping slots at the upper and lower ends of the adjacent two guide housings.

[0009] Preferably, the wedge-shaped tooth of the bottom guide housing comprises a tooth straight surface and a tooth inclined surface, and the wedge-shaped slot of the lower pump head assembly comprises a slot straight surface and a slot inclined surface; the tooth straight surface is matched with the slot straight surface to limit the counterclockwise rotation of the bottom guide housing relative to the lower pump head assembly.

[0010] Preferably, after the locking sleeve is screwed into place, a blind hole is provided on the upper end surface of the compression ring corresponding to the position of the threaded through hole of the locking sleeve, and the bottom boss of the cylindrical end fixing screw enters the blind hole.

[0011] Preferably, the rotating member comprises an impeller sleeved on the pump shaft, bearing sleeve one and bearing sleeve two at both ends, and a pump stop ring, and the impeller is arranged in the middle of the guide housing.

[0012] Preferably, the lower end of the pump shaft is fixed by a shaft baffle two, the bearing sleeve one at the upper end of the pump shaft and the two sides of the pump stop ring are fixed by two shaft baffle ones, and the pump stop ring is locked and fixed on the pump shaft by a concave end fixing screw.

[0013] Preferably, the fixed part in the pump further comprises an upper pump head assembly, and the upper end surface of the locking sleeve is in close contact with or has a gap with the lower end surface of the upper pump head assembly.

[0014] Preferably, the upper pump head assembly is provided with an outlet bearing bush matched with the bearing sleeve, and the lower pump head assembly is provided with an inlet bearing bush matched with the bearing sleeve.

[0015] Preferably, the bottom guide shell is designed in a split type, comprising a bottom body and a positioning ring embedded in the bottom body, and the lower pump head assembly comprises a lower pump head body, and the outer circle of the positioning ring is matched with the inner hole of the lower pump head body.

[0016] The present application provides a full locking submersible pump. The present application has the following advantages: 1. The present application sets the mutually meshing rotation-stopping teeth and rotation-stopping grooves on the convex stop of the guide shell, and sets the thin-wall fixing sleeve on the connection of the adjacent guide shells. The side surface contact of the teeth and the grooves effectively transmits and decomposes the reverse torque of the fluid acting on the guide vane, prevents the relative rotation between the guide shells, and provides a unified radial reference for the whole guide shell stack by the precise matching of the inner diameter of the fixing sleeve and the convex stop of the guide shell, thereby greatly ensuring the accurate concentricity of the multi-stage guide flow channel, and reducing the leakage and improving the volumetric efficiency.

[0017] 2. The present application uses the unique matching structure formed by the wedge-shaped teeth on the lower end surface of the bottom guide shell and the wedge-shaped groove on the upper end surface of the lower pump head to realize the unity of assembly convenience and reliable rotation stopping. The characteristics of the inclined surface matching allow smooth sliding during assembly, and facilitate the screwing of the lower pump head into place. After the whole pump fixed part is axially compressed, the self-locking effect of the inclined surface and the rigid abutment of the straight surface jointly form an extremely stable rotation-stopping base, which can firmly lock the accumulated torque transmitted by all the upper guide shells on the pump shell, and prevent the risk of rotation of the whole fixed part system.

[0018] 3. After the locking sleeve of the present application applies axial pre-tightening force to compress all the fixed parts, a cylindrical end set screw is used to pass through the locking sleeve and make the bottom boss of the set screw enter the blind hole pre-set in the compression ring, forming a double insurance mechanism of pre-tightening + mechanical interlocking. This positive meshing locking mode completely overcomes the defect of the traditional set screw which only relies on the end surface friction to prevent loosening, can effectively resist the high-frequency vibration and impact load of the pump in long-term operation, prevent the locking sleeve from rotating and loosening, ensure the constant and effective pre-tightening force applied to the whole fixed part, and thus ensure the continuous reliability of the full locking structure of the present application during the whole service life. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of the pump shell of the present application; Figure 2 It is a perspective view of the present application; Figure 3 Figure 1 is a schematic diagram of the upper end portion structure of the guide shell of the present application; Figure 4 Figure 2 is a schematic diagram of the lower end portion structure of the guide shell of the present application; Figure 5 Figure 3 is a schematic diagram of the compression ring portion structure of the present application; Figure 6 Figure 4 is a schematic diagram of the assembly of the bottom guide shell and the lower pump head of the present application; Figure 7 Figure 5 is a schematic diagram of the upper end of the bottom guide shell of the present application; Figure 8 Figure 6 is a schematic diagram of the lower end of the bottom guide shell of the present application; Figure 9 Figure 7 is a schematic diagram of the lower pump head body portion structure of the present application.

[0020] In the figure, 1 is the upper pump head assembly; 2 is the outlet bearing bush; 3 is bearing sleeve one; 4 is the concave end set screw; 5 is the locking sleeve; 6 is the pump stop ring; 7 is the compression ring; 8 is the shaft retainer one; 9 is the cylindrical end set screw; 10 is the guide shell; 11 is the impeller; 12 is the fixed sleeve; 13 is the pump shell; 14 is the pump shaft; 15 is the bottom guide shell; 1501 is the bottom body; 1502 is the positioning ring; 16 is the shaft retainer two; 17 is the lower pump head assembly; 1701 is the lower pump head body; 1702 is the inlet bearing bush; 18 is bearing sleeve two; 19 is the guide shell upper end; 20 is the rotation stopping tooth; 21 is the guide shell lower end; 22 is the rotation stopping groove; 23 is the wedge-shaped tooth; 24 is the tooth straight surface; 25 is the tooth inclined surface; 26 is the groove inclined surface; 27 is the groove straight surface; and 28 is the wedge-shaped groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the present application specification. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0022] Please refer to the drawings in the present application specification Figure 1 - the drawings in the present application specification Figure 2 The embodiments of the present application provide a full locking submersible pump, which comprises: a pump shell 13; a pump shaft 14 rotatably assembled in the pump shell 13; a rotating member sleeved on the pump shaft 14 and rotating with the pump shaft 14; a fixed member assembled in the pump shell 13 and sleeved outside the pump shaft 14, the fixed member comprising: a lower pump head assembly 17, the upper end surface of which is provided with a wedge-shaped groove 28; The bottom guide shell 15 is provided with wedge teeth 23 at its lower end surface, which are matched with the wedge-shaped slot 28, and is provided with the rotation-stopping teeth 20 at its upper end; The guide shell 10 is provided with the rotation-stopping slot 22 at its lower end, which is matched with the rotation-stopping teeth 20 of the bottom guide shell 15, and is also provided with the rotation-stopping teeth 20 at its upper end, and the multi-stage guide shell 10 is connected with the rotation-stopping slot 22 at the lower end of the next-stage guide shell 10 through the rotation-stopping teeth 20 at its upper end; The compression ring 7 is provided with the rotation-stopping slot 22, which is matched with the rotation-stopping teeth 20 at the upper end of the last-stage guide shell 10; The locking sleeve 5 is connected with the pump shell 13 through the thread to compress the compression ring 7, and is provided with the threaded through hole; The cylindrical end fixing screw 9 penetrates through the threaded through hole of the locking sleeve 5 and abuts against the compression ring 7 to limit the relative rotation of the locking sleeve 5 and the compression ring 7.

[0023] The upper and lower sides of the guide shell 10 are convex, the rotation-stopping teeth 20 are uniformly distributed at the guide shell upper end 19 of the guide shell 10, the rotation-stopping slot 22 is uniformly distributed at the guide shell lower end 21 of the guide shell 10, and the number of the rotation-stopping teeth 20 is the same as that of the rotation-stopping slot 22 and the width is matched.

[0024] Specifically, when the pump is running, the fluid reaction torque borne by each stage of the guide shell 10 is transmitted to the bottom guide shell 15 through the mechanical interlocking structure formed by the rotation-stopping teeth 20 at the guide shell upper end 19 and the rotation-stopping slot 22 at the guide shell lower end 21 of the adjacent guide shell 10, and is finally collected, and the bottom guide shell 15 forms a key torque conversion and locking interface with the wedge-shaped slot 28 at the upper end of the lower pump head assembly 17 through the wedge teeth 23 at its lower end, and the self-locking effect of the wedge-shaped structure stably transmits the huge circumferential torque to the lower pump head assembly 17 which is firmly connected with the pump shell 13 after the axial pressure of the locking sleeve 5 compacts all the fixed parts, so that the final release of the torque is realized, and further, the anti-rotation locking of the locking sleeve 5 by the cylindrical end fixing screw 9 ensures the long-term effectiveness of the locking system, which is equivalent to a mechanical insurance for the whole pre-tightening system to prevent the pre-tightening force from decaying or the locking sleeve 5 from loosening under the long-term high-frequency vibration of the equipment, and the whole process and multi-stage mechanical locking from the torque generation source to the final bearing component is realized.

[0025] Please refer to the attached Figure 1 -attached Figure 5, the fixed sleeve 12 is a thin-walled cylindrical part, the inner diameter of which is matched with the convex stop of the guide shell 10, and is sleeved on the outer side of the rotation stop gear 20 and the rotation stop groove 22 which are engaged with each other at the upper and lower ends of the two adjacent guide shells 10, the wedge teeth 23 of the bottom guide shell 15 include a tooth straight surface 24 and a tooth inclined surface 25, and the wedge groove 28 of the lower pump head assembly 17 includes a groove straight surface 27 and a groove inclined surface 26; the tooth straight surface 24 is matched with the groove straight surface 27 to limit the counterclockwise rotation of the bottom guide shell 15 relative to the lower pump head assembly 17, and after the locking sleeve 5 is screwed into place, a blind hole is arranged on the upper end surface of the compression ring 7 corresponding to the threaded hole position of the locking sleeve 5, the bottom boss of the cylindrical end fixing screw 9 is inserted into the blind hole, the rotating part includes the impeller 11 sleeved on the pump shaft 14, the bearing sleeve one 3 and the bearing sleeve two 18 at both ends, and the pump stop ring 6, the impeller 11 is arranged in the middle of the guide shell 10, the lower end of the pump shaft 14 is fixed by the shaft baffle two 16, the bearing sleeve one 3 at the upper end of the pump shaft 14 and the two sides of the pump stop ring 6 are fixed by the two shaft baffles one 8, and the pump stop ring 6 is locked and fixed on the pump shaft 14 by the concave end fixing screw 4.

[0026] Specifically, the thin-walled cylindrical fixed sleeve 12 which is additionally arranged outside the cascade structure of the multi-stage guide shell 10 has a function far beyond simple external constraint, and through the precise machining of the inner diameter which is closely matched with the convex stop of the guide shell 10, a unified radial reference is provided for the entire guide shell stack, thereby actively ensuring the accurate concentricity of the guide flow channels at each stage, which is crucial for suppressing potential vibration at high speed, reducing hydraulic loss and prolonging bearing life; at the same time, at the torque bearing base of the pump group, the design of the wedge teeth 23 of the bottom guide shell 15 and the wedge groove 28 of the lower pump head assembly 17 is refined into a dual-function interface, the tooth inclined surface 25 and the groove inclined surface 26 are responsible for generating a self-locking effect under axial pre-tightening, and the specially arranged tooth straight surface 24 and groove straight surface 27 constitute a rigid, non-slip torque transmission plane to bear and conduct the most important fluid reaction torque, realizing the separation and optimization of locking and torque transmission functions; at the top of the locking system, the final locking also abandons pure friction force locking, and by drilling a blind hole on the compression ring 7, the boss at the bottom of the cylindrical end fixing screw 9 can be embedded therein, forming a shear type mechanical interlocking similar to a pin, and compared with the end face abutting of ordinary fixing screws, this positive engagement locking method has a quantitative improvement in vibration resistance and anti-loosening reliability; finally, the stability of the entire rotating part assembly is fully guaranteed, the impeller 11 and the bearing sleeve one 3, the bearing sleeve two 18 and the pump stop ring 6 at both ends are firmly axially limited by the shaft baffles one 8 and the shaft baffles two 16, and in particular, the pump stop ring 6 itself is rigidly anchored on the pump shaft 14 by the concave end fixing screw 4, and a series of measures ensure that the rotating body itself is a high-rigidity, low-movement whole.

[0027] Please refer to the attached drawings Figure 6 - the attached drawings Figure 9The pump inner fixing part further comprises an upper pump head assembly 1, the upper end surface of the locking sleeve 5 is tightly attached to the lower end surface of the upper pump head assembly 1 or a small gap is left, the upper pump head assembly 1 is internally provided with an outlet bearing bush 2 matched with the bearing sleeve 1, the lower pump head assembly 17 is internally provided with an inlet bearing bush 1702 matched with the bearing sleeve 2, the bottom guide housing 15 is designed in a split type, comprising a bottom body 1501 and a positioning ring 1502 inlaid in the bottom body 1501, the lower pump head assembly 17 comprises a lower pump head body 1701, the outer circle of the positioning ring 1502 is matched with the inner hole of the lower pump head body 1701.

[0028] Specifically, the upper pump head assembly 1 and the lower pump head assembly 17 respectively internally provided with the outlet bearing bush 2 and the inlet bearing bush 1702 jointly constitute a high-precision radial support system at both ends of the rotating system, and the small gap reserved between the locking sleeve 5 and the upper pump head assembly 1 is an isolation design, which ensures that the huge axial force generated by the locking system is completely used for compacting the guide housing stack, and will not produce any harmful stress interference on the centering accuracy of the upper bearing, and more worth mentioning is that the split type structure of the bottom body 1501 and the positioning ring 1502 of the bottom guide housing 15, this design not only greatly reduces the machining difficulty and manufacturing cost of the complex wedge teeth 23 thereon, but also establishes a centering reference at the most critical inlet of the pump set through the precise matching of the outer circle of the positioning ring 1502 and the inner hole of the lower pump head body 1701, and seals the inlet of the first stage impeller.

[0029] Working principle: when running, the pump shaft 14 rotates at high speed under external power drive, and drives the rotating parts assembled thereon, including the impeller 11, bearing sleeve one 3, bearing sleeve two 18 and pump stop ring 6, to rotate as a whole, wherein the impeller 11 does work on the fluid, and the pump stop ring 6 is locked on the pump shaft 14 by the concave end locking screw 4, and cooperates with the shaft baffle one 8 to limit the axial position of the bearing sleeve one 3, and the lower end of the pump shaft 14 is limited by the shaft baffle two 16, and the rotation of the entire pump shaft 14 is guaranteed by the radial support formed by the outlet bearing 2 in the upper pump head assembly 1 and the bearing sleeve one 3, and the inlet bearing 1702 in the lower pump head assembly 17 and the bearing sleeve two 18; in order to fundamentally prevent the rotating of the fixed parts, first, the stable base is established by the threaded connection between the lower pump head body 1701 of the lower pump head assembly 17 and the pump shell 13, and the wedge-shaped groove 28 on the upper end surface and the wedge-shaped teeth 23 on the lower end surface of the bottom guide shell 15 are engaged with each other, when all the fixed parts are pressed tightly by the locking mechanism, the tooth inclined surface 25 of the wedge-shaped teeth 23 and the groove inclined surface 26 of the wedge-shaped groove 28 are completely matched, which prevents the upward sliding rotation of the bottom guide shell 15, and the tooth straight surface 24 and the groove straight surface 27 directly limit the reverse rotation of the bottom guide shell 15, and the split design of the bottom body 1501 of the bottom guide shell 15 and the positioning ring 1502 ensures the machining precision and the smooth assembly; then, the rotation stopping teeth 20 on the upper end of the bottom guide shell 15 and the rotation stopping groove 22 on the lower end 21 of the first level guide shell 10 are inserted into each other, and the rotation stopping teeth 20 on the upper end 19 of the multi-level guide shell 10 are also connected with the rotation stopping groove 22 on the lower end 21 of the next level guide shell in sequence, and a thin-walled cylindrical fixing sleeve 12 is sleeved on each level of connection, the inner diameter of the fixing sleeve 12 is closely matched with the convex stop port of the guide shell 10, which not only ensures the concentricity of the multi-level guide shell, but also transmits torque through the contact of the tooth groove side wall, so that all the guide shells 10 and the bottom guide shell 15 form an integral body that cannot rotate relative to each other; at the uppermost end of the guide shell stack, the compression ring 7 is connected with the rotation stopping teeth 20 of the last level guide shell 10 through the rotation stopping groove 22, completing the connection of the entire rotation stopping chain; finally, the locking sleeve 5 is screwed into the pump shell 13, and the compression ring 7 and all the fixed parts below are pressed tightly by applying downward pressure, realizing the axial compression of the whole body, at this time, the cylindrical end locking screw 9 is screwed into the blind hole pre-set on the compression ring 7 through the threaded hole of the locking sleeve 5, and the bottom boss enters the blind hole, so as to firmly lock the locking sleeve 5 and the entire guide shell stack together, preventing the locking sleeve 5 from loosening due to vibration and other reasons, and finally through a series of rotation stopping structures from the lower pump head assembly 17 to the locking sleeve 5, it is ensured that all the fixed parts cannot rotate under any working condition.

[0030] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A fully locking submersible pump, characterized in that, include: Pump casing (13); Pump shaft (14), which is rotatably mounted inside the pump housing (13); A rotating component, which is fitted onto the pump shaft (14) and rotates with the pump shaft (14); A fixing member, which is assembled inside the pump housing (13) and sleeved outside the pump shaft (14), the fixing member includes: The lower pump head assembly (17) has a wedge-shaped groove (28) on its upper end face. The bottom guide shell (15) has a wedge tooth (23) on its lower end face that matches the wedge groove (28), and an anti-rotation tooth (20) on the upper end of the bottom guide shell (15). The guide shell (10) has a rotation groove (22) at its lower end that cooperates with the rotation groove (20) of the bottom guide shell (15), and a rotation groove (20) at its upper end. The multi-stage guide shells (10) are connected in sequence to the rotation groove (22) at the lower end of the next stage guide shell (10) through the rotation groove (20) at the upper end of the guide shell (10). Compression ring (7), the lower end of which is provided with anti-rotation groove (22) that cooperates with the anti-rotation tooth (20) at the upper end of the last stage guide shell (10). A locking sleeve (5) is connected to the pump housing (13) by threads to press the compression ring (7), and the locking sleeve (5) is provided with a threaded through hole; A cylindrical end set screw (9) passes through the threaded through hole of the locking sleeve (5) and abuts against the compression ring (7) to restrict the relative rotation of the locking sleeve (5) and the compression ring (7).

2. The fully locking submersible pump according to claim 1, characterized in that, The upper and lower sides of the guide shell (10) are both convex stops. The upper end (19) of the guide shell (10) is provided with protruding anti-rotation teeth (20) evenly distributed along the circumference. The lower end (21) of the guide shell (10) is provided with anti-rotation grooves (22) evenly distributed along the circumference. The number of anti-rotation teeth (20) and anti-rotation grooves (22) are the same and their widths match.

3. A fully locking submersible pump according to claim 1, characterized in that, The submersible pump also includes a fixing sleeve (12); the fixing sleeve (12) is a thin-walled cylindrical part, the inner diameter of which matches the convex stop of the guide shell (10), and is fitted on the outside of the anti-rotation teeth (20) and anti-rotation grooves (22) that mesh with each other at the upper and lower ends of the adjacent two stages of the guide shell (10).

4. A fully locking submersible pump according to claim 1, characterized in that, The wedge-shaped teeth (23) of the bottom guide shell (15) include a tooth straight surface (24) and a tooth inclined surface (25), and the wedge-shaped groove (28) of the lower pump head assembly (17) includes a groove straight surface (27) and a groove inclined surface (26); the tooth straight surface (24) cooperates with the groove straight surface (27) to restrict the counterclockwise rotation of the bottom guide shell (15) relative to the lower pump head assembly (17).

5. A fully locking submersible pump according to claim 1, characterized in that, After the locking sleeve (5) is tightened into place, a blind hole is provided on the upper end face of the compression ring (7) corresponding to the threaded through hole of the locking sleeve (5), and the bottom boss of the cylindrical end set screw (9) enters the blind hole.

6. A fully locking submersible pump according to claim 1, characterized in that, The rotating component includes an impeller (11) mounted on the pump shaft (14), bearing sleeve one (3) at both ends, bearing sleeve two (18) and pump stop ring (6), with the impeller (11) located in the middle of the guide shell (10).

7. A fully locking submersible pump according to claim 6, characterized in that, The lower end of the pump shaft (14) is limited and fixed by a shaft retaining ring two (16). The upper end of the pump shaft (14) bearing sleeve one (3) and the two sides of the pump stop ring (6) are fixed by two shaft retaining rings one (8). The pump stop ring (6) is locked and fixed on the pump shaft (14) by a concave end set screw (4).

8. A fully locking submersible pump according to claim 1, characterized in that, The fixing component inside the pump also includes an upper pump head assembly (1), and the upper end face of the locking sleeve (5) is either close to or has a gap with the lower end face of the upper pump head assembly (1).

9. A fully locking submersible pump according to claim 8, characterized in that, The upper pump head assembly (1) is provided with an outlet bearing bush (2) that cooperates with bearing sleeve one (3), and the lower pump head assembly (17) is provided with an inlet bearing bush (1702) that cooperates with bearing sleeve two (18).

10. A fully locking submersible pump according to claim 1, characterized in that, The bottom guide shell (15) is a split design, including a bottom body (1501) and a positioning ring (1502) embedded in the bottom body (1501). The lower pump head assembly (17) includes a lower pump head body (1701), and the outer circle of the positioning ring (1502) is engaged with the inner hole of the lower pump head body (1701).

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