High-lift long-life vertical multi-stage centrifugal pump

Abstract

A high-lift long-service-life vertical multi-stage centrifugal pump comprises a water feeding base, a water inlet connector arranged on the left side of the water feeding base and a motor arranged over the water feeding base, a main shell is arranged between the motor and the water feeding base, a rotating shaft is arranged at the lower end of a motor shaft of the motor, and a plurality of impellers evenly distributed in the axial direction are arranged on the rotating shaft. The impeller is covered with an impeller shell matched with the impeller, a water inlet hole communicated with the lowest impeller shell is formed in the upper surface of the water supply base, a water supply gap is formed between the outer wall of the impeller shell and the inner wall of the main shell, a water outlet connector communicated with the water supply gap is arranged on the right side of the water supply base, and a filter base is arranged in a port of the left end of the water inlet connector. According to the high-lift long-service-life vertical multi-stage centrifugal pump, granular impurities in water flow can be effectively filtered out, the granular impurities in the water flow cannot make contact with the impeller, the service life of the impeller is prolonged, and the situation that the filtering holes are blocked can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to a multistage centrifugal pump, in particular to a vertical multistage centrifugal pump with high head and long service life. Background Art

[0002] The multi-stage centrifugal pump is a vertical structure with multiple impellers evenly distributed axially, which can effectively achieve the effect of high lift. When the multi-stage centrifugal pump is running, the external water flow will be drawn into the multi-stage centrifugal pump through the water inlet joint, and then driven by the rotation of multiple impellers, it will be transported to the water outlet joint, and finally sent to the pipeline connected to the water outlet joint.

[0003] In the process of actual water delivery by a multi-stage centrifugal pump, the delivered water is not necessarily a clean water flow. It is very easy for granular impurities to be mixed in the water flow. When the impeller drives the water flow to be delivered, the impeller will inevitably come into contact with the granular impurities. This contact will not only cause the granular impurities to collide with the impeller to produce noise, but also each contact will cause wear of the impeller. As the use time increases, the impeller will eventually wear to the point where it cannot be used, resulting in a serious shortening of the impeller's service life. In order to avoid this situation, a filter net is generally installed at the water inlet joint to retain the granular impurities mixed in the water flow outside the multi-stage centrifugal pump. However, in the actual filtration process of the filter net, as the filtration is carried out for a long time, some granular impurities will be stuck in the filter holes on the filter net under the push of high-pressure water flow, eventually causing the filter holes to be blocked, affecting the filtration effect of the filter holes, and at the same time causing the water flow to be unable to pass through the filter holes normally, affecting the normal delivery of the water flow. Summary of the invention

[0004] The utility model aims to solve the existing technical problem by providing a high-lift and long-life vertical multi-stage centrifugal pump, which can not only effectively filter out granular impurities in the water flow, so that the granular impurities in the water flow will not come into contact with the impeller, thereby extending the service life of the impeller, but also can effectively avoid the situation where the filter holes are blocked.

[0005] The technical solution adopted by the utility model to solve the above technical problems is:

[0006] The utility model discloses a high-lift and long-life vertical multi-stage centrifugal pump, comprising a water supply seat, a water inlet joint arranged on the left side of the water supply seat and a motor arranged just above the water supply seat, a main housing is arranged between the motor and the water supply seat, a rotating shaft is arranged at the lower end of the motor shaft of the motor, a plurality of impellers evenly distributed in the axial direction are arranged on the rotating shaft, the impeller outer cover is provided with an impeller housing matched therewith, a water inlet hole which is communicated with the impeller housing located at the bottom is arranged on the upper surface of the water supply seat, a water supply gap is arranged between the outer wall of the impeller housing and the inner wall of the main housing, a water outlet joint which is communicated with the water supply gap is arranged on the right side of the water supply seat, a filter seat is arranged in the left end port of the water inlet joint; an annular clamping groove is arranged on the inner wall of the left end port of the water inlet joint; a clamping part which matches the clamping groove is arranged on the outer wall of the left end of the filter seat; the clamping part and the clamping groove are fixed by a connecting structure; the A water-through hole axially penetrating the filter seat is provided at the center; an annular limiting groove is provided on the inner wall of the right end of the water-through hole; a filter plate matching it is provided in the limiting groove; a limiting ring matching it is screwed on the notch at the right end of the limiting groove, and the left end face of the limiting ring presses the filter plate tightly against the left groove wall of the limiting groove; a number of evenly distributed filter holes are provided on the filter plate; a number of evenly distributed positioning blocks are provided on the outer edge of the left side wall of the filter plate; a number of positioning holes matching the positioning blocks are provided on the left groove wall of the limiting groove; a top plate is provided on the right side of the filter seat; the top plate is connected to the filter seat through a number of circumferentially evenly distributed guide reset structures; a number of ejector seats corresponding to the positions of the filter holes are provided on the left side wall of the top plate; an ejector pin coaxial with the filter hole is provided at the center of the left end face of the ejector pin seat, and the diameter of the ejector pin is smaller than the diameter of the filter hole.

[0007] The guide reset structure includes a guide hole arranged at the outer edge of the top plate; a plurality of first screw holes corresponding to the positions of the guide holes are arranged at the outer edge of the right end surface of the filter seat; a guide rod matching the guide hole is arranged in the guide hole; the right end of the guide rod passes rightward out of the guide hole and is screwed with an adjusting nut matching the guide hole; a right spring is arranged outside the guide rod between the left end surface of the adjusting nut and the right side wall of the top plate; a plurality of rubber blocks corresponding to the positions of the guide holes are arranged at the outer edge of the right end surface of the filter seat, and the left end surface of the rubber block is aligned with the right end surface of the filter seat The rubber block is provided with an elastic hole at the center of the right end face; a through hole communicating with the first screw hole is provided at the center of the bottom of the elastic hole; the left end of the guide rod passes through the elastic hole and the through hole to the left in sequence and is screwed into the first screw hole; a limiting part is provided on the left part of the guide rod and is in contact with the bottom of the elastic hole; a left spring is provided outside the guide rod between the right side wall of the limiting part and the left side wall of the top plate; there is a moving distance between the right end face of the rubber block and the left side wall of the top plate; there is a water-passing gap between the outer wall of the top plate and the inner wall of the water inlet joint.

[0008] The outer edge of the top plate is provided with a plurality of auxiliary holes which are evenly distributed in a circumference.

[0009] The outer sleeve of the ejector seat is provided with a buffer sleeve matching it, and the buffer sleeve is made of rubber; the center of the left end face of the buffer sleeve is provided with a left through hole that is connected with its internal space, and the ejector passes through the left through hole to the left; the center of the right end face of the buffer sleeve is provided with a right through hole that is connected with its internal space; the left side wall of the ejector plate is provided with a plurality of second screw holes corresponding to the positions of the right through holes; the center of the right end face of the ejector seat is provided with a screw joint; the right end of the screw joint passes through the right through hole to the right and is screwed into the second screw hole.

[0010] The diameter of the left end needle of the ejector pin gradually decreases from right to left; the left end needle of the ejector pin is adjacent to the right end opening of the filter hole.

[0011] The connection structure includes a plurality of hidden holes arranged in a circle on the left side wall of the locking portion; a plurality of third screw holes coaxial with the hidden holes are arranged on the right side wall of the locking groove; a connecting hole communicating with the third screw hole is arranged at the center of the bottom of the hidden hole; a screw passes through the connecting hole to the right and is screwed into the third screw hole, and the head of the screw is located in the hidden hole and pressed on the bottom of the hidden hole.

[0012] The outer wall of the filter seat is provided with an annular sealing groove; a matching sealing ring is provided in the sealing groove.

[0013] The right end surface of the limiting ring is provided with symmetrical rotating handles on the upper and lower sides; the distance between the right end surface of the rotating handle and the left side wall of the top plate is greater than the distance between the left end surface of the ejector seat and the right side wall of the filter plate.

[0014] The outer wall of the left end of the water inlet joint is provided with an annular fixing portion; the fixing portion is provided with a plurality of fixing holes evenly distributed in a circumference.

[0015] The beneficial effects of the utility model are:

[0016] Compared with the prior art, when the water inlet joint of the high-lift and long-life vertical multi-stage centrifugal pump adopts the structure of the utility model to suck the external water flow, the external water flow will directly enter the water hole of the filter seat. At this time, the external water flow will be blocked by the filter plate. The filter holes on the filter plate can effectively block the granular impurities in the water flow on the left side of the filter plate, thereby ensuring that the water flow that actually flows into the water inlet joint is clean water flow. When the clean water flow flows to the right side of the filter plate through the right end hole of the filter hole, the clean water flow will flow to the impeller housing through the water gap between the outer wall of the top plate and the inner wall of the water inlet joint, thereby ensuring that the water flow that actually contacts the impeller is clean water flow, effectively avoiding the direct contact and collision between the impeller and the granular impurities, resulting in impeller wear and noise, and effectively extending the service life of the impeller.

[0017] Compared with the prior art, in the high-lift, long-life vertical multi-stage centrifugal pump of the utility model structure, when clean water flows into the impeller housing through the water-passing gap, a part of the water flow directly impacts the left side wall of the top plate, causing the top plate to move right under the action of water pressure. At this time, the right spring is compressed and produces elasticity. When the water flow stops, the top plate will reset to the left under the elastic action of the right spring. Under the sudden application of the elasticity of the right spring, the leftward movement of the top plate increases accordingly, thereby exceeding the initial position of the top plate. At this time, the top plate will drive the ejector pin to instantly insert to the left into the filter hole through the ejector pin seat. If the filter hole If there are granular impurities clogged, they will be directly pushed to the left by the ejector pin, thereby realizing automatic cleaning of the filter hole. After cleaning, the left spring will use its own elasticity to move the ejector plate to the right and reset it. Finally, with the cooperation of the left spring and the right spring, the ejector plate drives the ejector pin back to the final position to avoid the situation where the ejector pin clogs the filter hole. This automatic cleaning method of the filter hole can effectively prevent the filter hole from filtering granular impurities for a long time and causing itself to be clogged by granular impurities, thereby effectively ensuring the filtering effect of the filter hole and effectively ensuring that the filter hole can pass water normally without affecting the normal operation of the multi-stage centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model high-lift and long-life vertical multi-stage centrifugal pump;

[0019] Figure 2 It is a partial cross-sectional view of the utility model of a high-lift and long-life vertical multi-stage centrifugal pump;

[0020] Figure 3 yes Figure 2 An enlarged view of part A. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] See also Figures 1 to 3The utility model provides a high-lift long-life vertical multi-stage centrifugal pump, comprising a water supply seat 1, a water inlet joint 2 arranged on the left side of the water supply seat 1, and a motor 3 arranged just above the water supply seat 1. A main housing 4 is arranged between the motor 3 and the water supply seat 1. A rotating shaft 5 is arranged at the lower end of the motor shaft of the motor 3. A plurality of impellers 6 are evenly distributed in the axial direction. The impeller 6 is covered with an impeller housing 7 matched therewith. A water inlet hole 8 is arranged on the upper surface of the water supply seat 1 and is connected to the impeller housing 7 located at the bottom. There is a water supply gap 9 between the outer wall of the wheel housing 7 and the inner wall of the main housing 4. A water outlet joint 10 that is connected to the water supply gap 9 is provided on the right side of the water supply seat 1. A filter seat 11 is provided in the left end port of the water inlet joint 2; an annular clamping groove 12 is provided on the inner wall of the left end port of the water inlet joint 2; a clamping portion 13 matching the clamping groove 12 is provided on the left end outer wall of the filter seat 11; the clamping portion 13 is fixed to the clamping groove 12 by a connecting structure; a filter seat 11 is provided in the center A water hole 14 axially penetrates the water hole 14; an annular limiting groove 15 is provided on the inner wall of the right end of the water hole 14; a filter plate 16 matching with it is provided in the limiting groove 15; a limiting ring 17 matching with it is screwed on the right end of the limiting groove 15, and the left end face of the limiting ring 17 presses the filter plate 16 tightly against the left groove wall of the limiting groove 15; a plurality of evenly distributed filter holes 18 are provided on the filter plate 16; a plurality of evenly distributed positioning holes 18 are provided on the outer edge of the left side wall of the filter plate 16 Block 19; a plurality of positioning holes 20 matching the positioning block 19 are provided on the left groove wall of the limiting groove 15; a top plate 21 is provided on the right side of the filter seat 11; the top plate 21 is connected to the filter seat 11 through a plurality of guiding reset structures evenly distributed on the circumference; a plurality of ejector seats 22 corresponding to the positions of the filter holes 18 are provided on the left side wall of the top plate 21; an ejector 23 coaxial with the filter hole 18 is provided at the center of the left end face of the ejector seat 22, and the diameter of the ejector 23 is smaller than the diameter of the filter hole 18.

[0023] The guide reset structure includes a guide hole 24 provided on the outer edge of the top plate 21; a plurality of first screw holes 25 corresponding to the positions of the guide holes 24 are provided on the outer edge of the right end surface of the filter seat 11; a guide rod 26 matching the guide hole 24 is provided inside the guide hole 24; the right end of the guide rod 26 extends to the right outside the guide hole 24 and is screwed with an adjusting nut 27 matching the guide hole 24; a right spring 28 is provided between the left end surface of the adjusting nut 27 and the right side wall of the top plate 21 and is set outside the guide rod 26; a plurality of rubber blocks 29 corresponding to the positions of the guide holes 24 are provided on the outer edge of the right end surface of the filter seat 11, and the left end surface of the rubber block 29 is in contact with the right end surface of the filter seat 11 The rubber block 29 is provided with an elastic hole 30 at the center of the right end face; a through hole 31 which is connected with the first screw hole 25 is provided at the center of the bottom of the elastic hole 30; the left end of the guide rod 26 passes through the elastic hole 30 and the through hole 31 to the left in sequence and is screwed into the first screw hole 25; a limiting portion 32 which is in contact with the bottom of the elastic hole 30 is provided at the left part of the guide rod 26; a left spring 33 which is set outside the guide rod 26 is provided between the right side wall of the limiting portion 32 and the left side wall of the top plate 21; a moving spacing 34 is provided between the right end face of the rubber block 29 and the left side wall of the top plate 21; a water-passing gap 35 is provided between the outer wall of the top plate 21 and the inner wall of the water inlet joint 2.

[0024] The outer edge of the top plate 21 is provided with a plurality of auxiliary holes 36 evenly distributed around the circumference.

[0025] The outer cover of the ejector seat 22 is provided with a buffer sleeve 37 matching with it, and the buffer sleeve 37 is made of rubber; the center of the left end face of the buffer sleeve 37 is provided with a left through hole 38 that is connected with its internal space, and the ejector 23 passes through the left through hole 38 to the left; the center of the right end face of the buffer sleeve 37 is provided with a right through hole 39 that is connected with its internal space; the left side wall of the ejector plate 21 is provided with a plurality of second screw holes 40 corresponding to the positions of the right through hole 39; the center of the right end face of the ejector seat 22 is provided with a screw joint 41; the right end of the screw joint 41 passes through the right through hole 39 to the right and is screwed into the second screw hole 40.

[0026] The diameter of the left end needle of the ejector pin 23 gradually decreases from right to left; the left end needle of the ejector pin 23 is adjacent to the right end opening of the filter hole 18 .

[0027] The connecting structure includes a plurality of hidden holes 42 which are arranged in a circle on the left side wall of the locking portion 13; a plurality of third screw holes 43 which are coaxial with the hidden holes 42 are arranged on the right side wall of the locking groove 12; a connecting hole 44 which is in communication with the third screw hole 43 is arranged at the center of the bottom of the hidden hole 42; a screw 45 passes through the connecting hole 44 to the right and is screwed into the third screw hole 43, and the head of the screw 45 is located in the hidden hole 42 and pressed on the bottom of the hidden hole 42.

[0028] An annular sealing groove 46 is disposed on the outer wall of the filter seat 11 ; a matching sealing ring 47 is disposed in the sealing groove 46 .

[0029] The right end surface of the limit ring 17 is provided with symmetrical handles 48 on the upper and lower sides; the distance between the right end surface of the handle 48 and the left side wall of the top plate 21 is greater than the distance between the left end surface of the ejector seat 22 and the right side wall of the filter plate 16.

[0030] The outer wall of the left end of the water inlet joint 2 is provided with an annular fixing portion 49; the fixing portion 49 is provided with a plurality of fixing holes 50 evenly distributed around the circumference.

[0031] The method of using the utility model is as follows:

[0032] The fixing portion 49 on the outer wall of the left end of the water inlet connector 2 facilitates the connection between the water inlet connector 2 and the water inlet pipeline. The connection between the water inlet connector 2 and the water inlet pipeline can be achieved by passing the screw through the fixing hole 50 on the fixing portion 49 and screwing it into the screw hole on the end of the water inlet pipeline. As the motor 3 is turned on, the motor shaft of the motor 3 will drive the rotating shaft 5 to rotate, thereby realizing the synchronous rotation of multiple impellers 6. At this time, the water flow filled in the impeller housing 7 will be driven, so that suction is generated at the port position at the left end of the water inlet connector 2, and the external water flow is continuously drawn into the water inlet connector 2, and finally enters from the water outlet on the uppermost impeller housing 7 into the water delivery gap 9 between the inner wall of the main housing 4 and the outer wall of the impeller housing 7, and then flows into the water outlet pipeline connected to the water outlet connector 10 through the water outlet connector 10 for transportation.

[0033] When the external water flow is sucked by the water inlet joint, it will directly enter the water hole 14 of the filter seat 11. At this time, the external water flow will be blocked by the filter plate 16. The filter hole 18 on the filter plate 16 can effectively block the granular impurities in the water flow on the left side of the filter plate 16, thereby ensuring that the water flow that actually flows into the water inlet joint 2 is clean water flow. When the clean water flow flows to the right side of the filter plate 16 through the right end hole of the filter hole 18, the clean water flow will flow to the impeller housing 7 through the water gap 35 between the outer wall of the top plate 21 and the inner wall of the water inlet joint 2, thereby ensuring that the water flow that actually contacts the impeller 6 is clean water flow, effectively avoiding the direct contact and collision between the impeller 6 and the granular impurities, causing the impeller 6 to wear and generate noise, and effectively extending the service life of the impeller 6.

[0034] When the clean water flows into the impeller housing 7 through the water-passing gap 35, a part of the water directly impacts the left side wall of the top plate 21, causing the top plate 21 to move rightward under the action of the water pressure. At this time, the right spring 28 is compressed and generates elasticity. When the water flow stops, the top plate 21 will return to the left under the elastic action of the right spring 28. Under the sudden application of the elasticity of the right spring 28, the leftward movement of the top plate 21 increases accordingly, thereby exceeding the initial position of the top plate 21. At this time, the top plate 21 will drive the ejector pin 23 to be instantly inserted to the left into the filter hole 18 through the ejector pin seat 22. If the filter hole 18 is clogged with granular impurities, they will be directly The ejector pin 23 is ejected to the left, thereby realizing automatic cleaning of the filter hole 18. After cleaning, the left spring 33 will use its own elasticity to move the ejector plate 21 to the right and reset. Finally, with the cooperation of the left spring 33 and the right spring 28, the ejector plate 21 drives the ejector pin 23 back to the final position, thereby preventing the ejector pin 23 from clogging the filter hole 18. This automatic cleaning method of the filter hole can effectively prevent the filter hole 18 from being clogged by the particulate impurities due to long-term filtering of the particulate impurities, thereby effectively ensuring the filtering effect of the filter hole 18 and effectively ensuring that the filter hole 18 can pass water normally without affecting the normal operation of the multi-stage centrifugal pump.

[0035] The guide reset structure includes a guide hole 24 arranged on the outer edge of the top plate 21, a guide rod 26 matching the guide hole 24 is arranged in the guide hole 24, a plurality of evenly distributed positioning blocks 19 are arranged on the outer edge of the left side wall of the filter plate 16, and a plurality of positioning holes 20 matching the positioning blocks 19 are arranged on the left groove wall of the limiting groove 15. The existence of the guide rod 26 can play a guiding role when the top plate 21 moves, and effectively avoid the situation where the top plate 21 rotates and causes the position of the ejector pin 23 to change. The existence of the positioning block 19 can effectively position the filter hole 18 on the filter plate 16, so that the position of the filter hole 18 is always relative to the position of the ejector pin 23, thereby ensuring that the ejector pin 23 can accurately clean the inside of the filter hole 18.

[0036] The right end of the guide rod 26 extends to the right outside the guide hole 24 and is screwed with an adjusting nut 27 that matches it. A right spring 28 outside the guide rod 26 is provided between the left end surface of the adjusting nut 27 and the right side wall of the top plate 21. The adjusting nut 27 can adjust its position on the guide rod 26 by simply rotating itself, thereby effectively changing the initial elasticity of the left spring 33 and the right spring 28. The initial elasticity of the left spring 33 and the right spring 28 can be effectively adjusted according to different water pressures, so that the ejector pin 23 can automatically clean the filter hole 18 more stably.

[0037] The outer edge of the right end surface of the filter seat 11 is provided with a plurality of rubber blocks 29 corresponding to the position of the guide hole 24, the left end surface of the rubber block 29 is in contact with the right end surface of the filter seat 11, and an elastic hole 30 is provided at the center of the right end surface of the rubber block 29; a through hole 31 which is in contact with the first screw hole 25 is provided at the center of the bottom of the elastic hole 30, the left end of the guide rod 26 passes through the elastic hole 30 and the through hole 31 to the left in sequence and is screwed into the first screw hole 25, and a limiting portion 32 which is in contact with the bottom of the elastic hole 30 is provided on the left part of the guide rod 26, and the right side wall of the limiting portion 32 is between the left side wall of the top plate 21 A left spring 33 is provided outside the guide rod 26, and a moving distance 34 is provided between the right end surface of the rubber block 29 and the left side wall of the top plate 21. When the top plate 21 moves to the left and the moving distance 34 becomes zero, the top plate 21 will directly squeeze the rubber block 29 to the left. At this time, the rubber block 29 is squeezed and generates elasticity, which can play an auxiliary reset effect when the top plate 21 is reset later. The rubber block 29 can be used as a damper to enable the top plate 21 to complete the reset more quickly and stably, thereby avoiding the situation where the elasticity of the left spring 33 and the right spring 28 causes the top plate 21 to move left and right repeatedly for a long time.

[0038] The outer edge of the top plate 21 is provided with a plurality of auxiliary holes 36 evenly distributed in a circle. The existence of the auxiliary holes 36 enables a portion of the clean water to flow into the impeller housing 7 through the water gap 35 while another portion of the clean water can flow, thereby ensuring sufficient water pressure to squeeze the top plate 21 to the right while ensuring the water flow rate.

[0039] The outer cover of the ejector seat 22 is provided with a buffer sleeve 37 matching with it. The buffer sleeve 37 is made of rubber. The center of the left end face of the buffer sleeve 37 is provided with a left through hole 38 intersecting with its internal space. The ejector 23 passes through the left through hole 38 to the left. The center of the right end face of the buffer sleeve 37 is provided with a right through hole 39 intersecting with its internal space. The left side wall of the ejector plate 21 is provided with a plurality of second screw holes 40 corresponding to the positions of the right through hole 39. The center of the right end face of the ejector seat 22 is provided with a screw joint 41. The right end of the screw joint 41 passes through the right through hole 39 to the right and is screwed into the second screw hole 40. This fixing method is convenient for the replacement of the ejector 23 after wear. The screw joint 41 only needs to be unscrewed from the second screw hole 40 to complete the separate replacement of the worn ejector pin 23, which effectively reduces the replacement cost. The left end face of the buffer sleeve 37 can replace the left end face of the ejector seat 22 to collide with the right side wall of the filter plate 16 when the ejector pin 23 penetrates to the left into the filter hole 18, thereby effectively playing a buffering role. At the same time, the right end portion of the buffer sleeve 37 is located between the right end face of the ejector seat 22 and the left side wall of the ejector plate 21, which can effectively seal the left end opening of the second screw hole 40, thereby preventing the second screw hole 40 from being corroded and rusted by water, causing the screw joint 41 to be stuck in the second screw hole 40.

[0040] The diameter of the left end needle of the ejector pin 23 gradually decreases from right to left. The left end needle of the ejector pin 23 is adjacent to the right end opening of the filter hole 18. This structure is actually more conducive to the ejector pin 23 quickly penetrating into the filter hole 18 for cleaning.

[0041] The connecting structure includes a plurality of hidden holes 42 which are circumferentially arranged on the left side wall of the locking portion 13, a plurality of third screw holes 43 which are coaxial with the hidden holes 42 are arranged on the right side wall of the locking groove 12, a connecting hole 44 which is in communication with the third screw hole 43 is arranged at the center of the bottom of the hidden hole 42, a screw 45 passes through the connecting hole 44 to the right and is screwed into the third screw hole 43, the head of the screw 45 is located in the hidden hole 42 and is pressed on the bottom of the hidden hole 42, this fixing method facilitates the disassembly and assembly of the filter seat 11, and the filter seat 11 can be completely removed from the water inlet connector 2 by simply unscrewing the screw 45 out of the third screw hole 43, and the existence of the hidden hole 42 can hide the head of the screw 45, so that the left end face of the filter seat 11 and the left end face of the water inlet connector 2 can be coplanar, which is beneficial to the connection between the water inlet connector 2 and the water inlet pipeline.

[0042] An annular sealing groove 46 is provided on the outer wall of the filter seat 11 , and a matching sealing ring 47 is provided in the sealing groove 46 . The presence of the sealing ring 47 can effectively improve the sealing between the outer wall of the filter seat 11 and the inner wall of the water inlet joint 2 .

[0043] Symmetrical rotary handles 48 are provided on the upper and lower sides of the right end surface of the limiting ring 17. The distance between the right end surface of the rotary handle 48 and the left side wall of the top plate 21 is greater than the distance between the left end surface of the ejector seat 22 and the right side wall of the filter plate 16. The existence of the rotary handle 48 makes it easy for the staff to apply force to the limiting ring 17, facilitates the disassembly and assembly of the limiting ring 17, and thus facilitates the disassembly and assembly of the filter plate 16.

Claims

1. A high-lift, long-life vertical multi-stage centrifugal pump, comprising a water delivery seat, a water inlet joint arranged on the left side of the water delivery seat, and a motor arranged just above the water delivery seat, a main housing is arranged between the motor and the water delivery seat, a rotating shaft is arranged at the lower end of the motor shaft of the motor, a plurality of impellers evenly distributed in the axial direction are arranged on the rotating shaft, the impeller outer cover is provided with an impeller housing matched therewith, a water inlet hole is arranged on the upper surface of the water delivery seat, which is connected with the impeller housing located at the bottom, a water delivery gap is arranged between the outer wall of the impeller housing and the inner wall of the main housing, and a water outlet joint connected with the water delivery gap is arranged on the right side of the water delivery seat, characterized in that: A filter seat is provided in the left end port of the water inlet joint; an annular clamping groove is provided on the inner wall of the left end port of the water inlet joint; a clamping part matching the clamping groove is provided on the outer wall of the left end of the filter seat; the clamping part and the clamping groove are fixed by a connecting structure; a water through hole axially penetrating through the filter seat is provided in the center of the filter seat; an annular limiting groove is provided on the inner wall of the right end opening of the water through hole; a filter plate matching the filter plate is provided in the limiting groove; a limiting ring matching the filter plate is screwed to the notch at the right end of the limiting groove, and the left end face of the limiting ring presses the filter plate tightly On the left side wall of the limiting groove; a plurality of evenly distributed filter holes are arranged on the filter plate; a plurality of evenly distributed positioning blocks are arranged on the outer edge of the left side wall of the filter plate; a plurality of positioning holes matching the positioning blocks are arranged on the left side wall of the limiting groove; a top plate is arranged on the right side of the filter seat; the top plate is connected to the filter seat through a plurality of circumferentially evenly distributed guiding and resetting structures; a plurality of ejector pin seats corresponding to the positions of the filter holes are arranged on the left side wall of the top plate; an ejector pin coaxial with the filter hole is arranged at the center of the left end face of the ejector pin seat, and the diameter of the ejector pin is smaller than the diameter of the filter hole.

2. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The guide reset structure includes a guide hole arranged at the outer edge of the top plate; a plurality of first screw holes corresponding to the positions of the guide holes are arranged at the outer edge of the right end surface of the filter seat; a guide rod matching the guide hole is arranged in the guide hole; the right end of the guide rod passes rightward out of the guide hole and is screwed with an adjusting nut matching the guide hole; a right spring is arranged outside the guide rod between the left end surface of the adjusting nut and the right side wall of the top plate; a plurality of rubber blocks corresponding to the positions of the guide holes are arranged at the outer edge of the right end surface of the filter seat, and the left end surface of the rubber block is aligned with the right end surface of the filter seat The rubber block is provided with an elastic hole at the center of the right end face; a through hole communicating with the first screw hole is provided at the center of the bottom of the elastic hole; the left end of the guide rod passes through the elastic hole and the through hole to the left in sequence and is screwed into the first screw hole; a limiting part is provided on the left part of the guide rod and is in contact with the bottom of the elastic hole; a left spring is provided outside the guide rod between the right side wall of the limiting part and the left side wall of the top plate; there is a moving distance between the right end face of the rubber block and the left side wall of the top plate; there is a water-passing gap between the outer wall of the top plate and the inner wall of the water inlet joint.

3. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The outer edge of the top plate is provided with a plurality of auxiliary holes which are evenly distributed in a circumference.

4. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The outer sleeve of the ejector seat is provided with a buffer sleeve matching it, and the buffer sleeve is made of rubber; the center of the left end face of the buffer sleeve is provided with a left through hole that is connected with its internal space, and the ejector passes through the left through hole to the left; the center of the right end face of the buffer sleeve is provided with a right through hole that is connected with its internal space; the left side wall of the ejector plate is provided with a plurality of second screw holes corresponding to the positions of the right through holes; the center of the right end face of the ejector seat is provided with a screw joint; the right end of the screw joint passes through the right through hole to the right and is screwed into the second screw hole.

5. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The diameter of the left end needle of the ejector pin gradually decreases from right to left; the left end needle of the ejector pin is adjacent to the right end opening of the filter hole.

6. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The connection structure includes a plurality of hidden holes arranged in a circle on the left side wall of the locking portion; a plurality of third screw holes coaxial with the hidden holes are arranged on the right side wall of the locking groove; a connecting hole communicating with the third screw hole is arranged at the center of the bottom of the hidden hole; a screw passes through the connecting hole to the right and is screwed into the third screw hole, and the head of the screw is located in the hidden hole and pressed on the bottom of the hidden hole.

7. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The outer wall of the filter seat is provided with an annular sealing groove; a sealing ring matching with the sealing groove is provided in the sealing groove.

8. The high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The right end surface of the limiting ring is provided with symmetrical rotating handles on the upper and lower sides; the distance between the right end surface of the rotating handle and the left side wall of the top plate is greater than the distance between the left end surface of the ejector seat and the right side wall of the filter plate.

9. A high-lift and long-life vertical multistage centrifugal pump according to claim 1, characterized in that: The outer wall of the left end of the water inlet joint is provided with an annular fixing portion; the fixing portion is provided with a plurality of fixing holes evenly distributed in a circumference.

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