A centrifugal pump for automatically controlling drainage variables and automatic control method thereof

Abstract

The present invention provides a centrifugal pump for automatically controlling the displacement of a centrifugal pump and an automatic control method thereof, and relates to the field of fluid transportation. The present invention comprises a centrifugal pump body, a water inlet structure and a water outlet pipe, wherein a displacement variable control structure is arranged on one side of the water outlet pipe; the displacement variable control structure comprises a shell, wherein a hydraulic cylinder is fixedly connected to one side of the shell close to the water outlet pipe, wherein a moving ring, an elastic liquid storage part and an elastic expansion part are arranged in sequence on one end of the hydraulic cylinder, wherein a plurality of pressure relief grooves and a plurality of outer boxes are arranged on the outer side of the shell, and the pressure relief grooves are arranged on the outer side of the shell; the L-shaped plate controls the flow rate of the water flow inside the shell through the plurality of pressure relief grooves according to the movement distance of the moving ring, and while the pressure of the water flow inside the shell is relieved, the water flow rate entering the connecting flange through the middle cavity of the elastic expansion part is ensured, and the flow rate of the water flow discharged by the centrifugal pump is adjusted by controlling the elastic expansion part inside the shell.

Description

Technical Field

[0001] The invention relates to a centrifugal pump, in particular to a centrifugal pump capable of automatically controlling drainage variables and an automatic control method thereof, belonging to the technical field of fluid transportation. Background Art

[0002] A centrifugal pump is a pump that transports liquids by the centrifugal force generated by the rotation of the impeller. A centrifugal pump is mainly composed of an impeller, a pump body, a pump shaft, bearings, sealing rings and a stuffing box. It is widely used in chemical industries such as petrochemicals and coal chemicals. Centrifugal pumps can be divided into acid pumps, alkali pumps, clean water pumps, mud pumps, etc.

[0003] A centrifugal pump is a machine for conveying liquids or pressurizing liquids. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. However, during the application of the centrifugal pump, the centrifugal pump can only change the pump's displacement by adjusting the power and changing the speed, which will cause the centrifugal force generated when the impeller rotates to decrease, affecting the stability of water absorption and the pump's head, and making it easy for the flow to stop. Summary of the invention

[0004] To solve the above problems, the present invention is implemented through the following technical solutions: a centrifugal pump with automatic centrifugal control of drainage variables and an automatic control method thereof, comprising a centrifugal pump body, a water inlet structure and a water outlet pipe, wherein a drainage variable control structure is arranged on one side of the water outlet pipe; the drainage variable control structure comprises an outer shell, a hydraulic cylinder is fixedly connected to the side of the outer shell close to the water outlet pipe, a moving ring, an elastic liquid storage part and an elastic expansion part are arranged in sequence on one end of the hydraulic cylinder, a plurality of pressure relief grooves and a plurality of outer boxes are arranged on the outside of the outer shell, the pressure relief groove is opened on the outside of the outer shell, and an L-shaped plate is arranged inside the plurality of outer boxes, one end of the L-shaped plate passes through the pressure relief groove and is fixedly connected to the moving ring, and a plurality of vertical grooves are arranged on the outside of the outer box; a rack is fixedly connected to the extending end of the hydraulic cylinder, and the rack A gear is meshed with one side of the strip, an electromagnet is arranged inside the gear, a transmission rod is fixedly connected inside the electromagnet, a magnet is sleeved on the outer top of the transmission rod, a hollow threaded rod is rotatably connected to one side of the moving ring, a transmission assembly is arranged between the hollow threaded rod and the transmission rod, and under the action of the transmission rod, the hydraulic cylinder will make the moving ring move a certain distance inside the shell after working, and the moving moving ring squeezes the elastic liquid storage part to shrink a part of it, a part of the medium inside the elastic liquid storage part enters the elastic expansion part through a plurality of guide tubes, the elastic expansion part fixedly connected inside the shell expands, and the hollow in the middle of the elastic expansion part shrinks a part, so that the flow discharged into the connecting flange through the elastic expansion part decreases.

[0005] Preferably, the outer shell is fixedly sleeved on the outside of the water outlet pipe, and one end of the outer shell away from the water outlet pipe is fixedly connected with a connecting flange, the moving ring, elastic liquid storage part and elastic expansion part are all arranged inside the outer shell, and two telescopic rods are fixedly connected between the moving ring and the outer shell.

[0006] Preferably, there is a distance between the extended end of the hydraulic cylinder and the moving ring, the elastic liquid storage part is fixedly connected to one side of the moving ring, the elastic expansion part is fixedly connected to the inside of the outer shell, fixed rings are provided on both sides of the elastic expansion part, the fixed rings are fixedly connected to the inside of the outer shell, one end of the elastic liquid storage part is fixedly connected to the adjacent fixed ring, and a plurality of guide tubes are fixedly connected between the fixed ring and the elastic expansion part.

[0007] Preferably, a guide pipe 2 is provided on one side of the multiple vertical grooves opened on the outside of the outer box, and the guide pipe 2 is fixedly connected to the outer box. A guide pipe 3 is fixedly connected between the multiple guide pipes 2, a guide pipe 4 is fixedly connected between the multiple guide pipes 3, and a guide pipe 5 is fixedly connected to one side of the guide pipe 4.

[0008] Preferably, a mounting frame is rotatably sleeved on the outer side of the transmission rod 1, the mounting frame is fixedly connected to the housing, and the transmission rod 1 and the gear 1 are rotatably mounted together via a bearing.

[0009] Preferably, the transmission assembly includes a transmission rod 2 and two bevel gears, the two bevel gears are fixedly connected to the transmission rod 1 and the transmission rod 2 respectively, the outer rotating sleeve of the transmission rod 2 is provided with a support frame 1 and a magnet member 2, the support frame 1 and the magnet member 2 are both fixedly connected to the outer shell, one end of the transmission rod 2 passes through the magnet member 2 and extends to the outside of the outer shell, the outer rotating sleeve of one end of the transmission rod 2 is provided with a support frame 2, and the support frame 2 is fixedly connected to the outer shell.

[0010] Preferably, the transmission assembly includes gear 2, which is fixedly connected to one end of the transmission rod 2 disposed on the outer side of the housing, and one side of the gear 2 is meshed with gear 3.

[0011] Preferably, a transmission rod 3 is fixedly connected inside the gear 3, and a support frame 3 and a sealing box are provided on the outer rotating sleeve of the transmission rod 3, and the support frame 3 and the sealing box are fixedly connected to the outer shell.

[0012] Preferably, the transmission assembly includes a hollow threaded rod, an outer threaded sleeve of the hollow threaded rod is provided with an internal threaded tube, the internal threaded tube is fixedly connected to the outer shell, one end of the hollow threaded rod passes through the internal threaded tube and is rotatably connected to the moving ring, a plurality of transmission rods four are fixedly connected inside the hollow threaded rod, a plurality of grooves are opened on the outer side of the transmission rod three, and the plurality of transmission rods four are respectively arranged inside the plurality of grooves.

[0013] A centrifugal pump automatic control method for automatically controlling drainage variables comprises the following steps:

[0014] Step 1: Input the flow value to be reduced on the controller or display screen electrically connected to the hydraulic cylinder. The controller or display screen controls the electrically connected hydraulic cylinder to work, so that the moving ring moves a certain distance, the elastic expansion member expands, the cavity in the middle of the elastic expansion member shrinks a part, and the flow discharged into the connecting flange decreases;

[0015] Step 2: After the movement ring moves, a part of the water flows out of the shell through the pressure relief groove and enters the outer box, and then enters the guide pipe 2 arranged on one side of the vertical groove through part of the vertical groove. The L-shaped plate controls the flow rate of the water flow inside the shell through the multiple pressure relief grooves according to the movement distance of the movement ring, relieves the pressure of the water flow inside the shell, and ensures the flow rate and speed of the water flow entering the connecting flange through the middle hole of the elastic expansion piece. The elastic expansion piece is controlled to adjust the flow rate of the water flow discharged by the centrifugal pump;

[0016] Step three, after the centrifugal pump discharge variable is regulated, the control electromagnet stops working, the fixation between transmission rod 1 and gear 1 is removed, the hydraulic cylinder cannot maintain its original state due to accidental power failure, its own failure, user's accidental touch, etc., and the accidental contraction drives the rack to move. Transmission rod 1 will not rotate under the action of rack and gear 1, and the moving ring maintains the state of squeezing the elastic liquid storage part.

[0017] The present invention provides a centrifugal pump for automatically controlling drainage variables and an automatic control method thereof, which has the following beneficial effects:

[0018] 1. A centrifugal pump and automatic control method for the centrifugal pump with automatic control of drainage variables, wherein a portion of the water flows out of the casing through the pressure relief groove and into the outer box, and then enters the interior of the guide pipe 2 arranged on one side of the vertical groove through part of the vertical groove, a plurality of guide pipes 2 are fixedly connected with a guide pipe 3, and a guide pipe 5 is fixedly connected to one side of the guide pipe 4 to which the plurality of guide pipes 3 are fixedly connected, so a portion of the water flows through the plurality of guide pipes 2 and the plurality of guide pipes 3 to be collected into the interior of the guide pipe 4, and finally flows to the water source connected to the water inlet structure through the guide pipe 5 fixedly connected to one side of the guide pipe 4; the L-shaped plate controls the flow rate of the water flow in the casing discharged through the plurality of pressure relief grooves according to the movement distance of the moving ring, while relieving the pressure of the water flow in the casing, the flow rate of the water flow entering the interior of the connecting flange through the hollow in the middle of the elastic expansion member is ensured, the flow rate of the water flow discharged from the centrifugal pump is adjusted by controlling the elastic expansion member in the casing, and the method of controlling the variable of the discharged water flow by controlling the working power of the centrifugal pump is changed, so as to avoid the decrease in the impeller speed caused by the decrease in the working power of the centrifugal pump, and the situation of unstable drainage or even drainage interruption caused by the decrease in centrifugal suction, thereby ensuring the stable operation of the centrifugal pump.

[0019] 2. The centrifugal pump and automatic control method for the centrifugal automatic control of drainage variables control the electromagnet to stop working. The hydraulic cylinder cannot maintain its original state due to accidental power failure, its own failure, user's mistake, etc., and the accidental contraction drives the rack to move. The transmission rod 1 will not rotate under the action of the rack and the gear 1. At this time, the transmission component is not subjected to force, and the hollow threaded rod will not rotate, so that the moving ring supported by the hollow threaded rod maintains the state of squeezing the elastic liquid storage part, avoiding the situation that the elastic expansion part automatically contracts and the staff needs to adjust the drainage variable of the centrifugal pump again after the drainage variable control structure stops working due to accidental power failure, its own failure, user's mistake, etc., so as to ensure the stability of the centrifugal pump after the drainage variable is adjusted.

[0020] 3. The centrifugal pump with automatic control of drainage variables and its automatic control method, when the hydraulic cylinder extends, it will drive gear one to rotate through the rack, the rotation of gear one drives transmission rod one to rotate through the electromagnet, the rotating transmission rod one drives transmission rod two to rotate through two bevel gears, and the rotating transmission rod two drives transmission rod three to rotate through gear two and gear three; the internal threaded tube is fixedly connected to the outer shell, the rotating hollow threaded rod moves under the action of the internal threaded tube, and one end of the hollow threaded rod passes through the internal threaded tube and is rotatably connected to the moving ring, the rotating hollow threaded rod drives the moving ring to move, and under the action of transmission rod one, electromagnet, and transmission assembly, the effect of causing the moving ring to move a certain distance inside the outer shell after the hydraulic cylinder works is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a partial structural schematic diagram of the flow guide pipe 5 of the present invention;

[0023] Figure 3 For the present invention Figure 2 Schematic diagram of the C part structure;

[0024] Figure 4 It is a schematic diagram of the structure of the housing of the present invention;

[0025] Figure 5 It is a partial structural schematic diagram of the sealing box of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the elastic expansion member of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the sealing box and the support frame 3 of the present invention;

[0028] Figure 8 It is a structural schematic diagram of the mounting frame of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the support frame 2 of the present invention;

[0030] Fig.10 It is a partial structural schematic diagram of the transmission rod 3 of the present invention;

[0031] Fig.11 It is a structural schematic diagram of a transmission rod 1 of the present invention;

[0032] Fig.12 It is a schematic diagram of the connection structure between the rack and the hydraulic cylinder of the present invention;

[0033] Fig.13 For the present invention Figure 5 Schematic diagram of the A part structure.

[0034] Description of reference numerals:

[0035] 1. Centrifugal pump body; 2. Water inlet structure; 3. Water outlet pipe; 4. Connection flange;

[0036] 5. Drainage variable control structure; 51. Shell; 52. Elastic expansion member; 53. Fixed ring; 54. Guide pipe 1; 55. Elastic liquid storage member; 56. Movement ring; 57. Telescopic rod; 58. Hydraulic cylinder; 59. Pressure relief groove; 510. L-shaped plate; 511. Outer box; 512. Vertical groove; 513. Guide pipe 2; 514. Guide pipe 3; 515. Guide pipe 4; 516. Guide pipe 5; 517. Rack; 518. Mounting frame; 51 9. Transmission rod one; 520. Magnet piece one; 521. Electromagnet; 522. Gear one; 523. Bevel gear; 524. Transmission rod two; 525. Support frame one; 526. Magnet piece two; 527. Gear two; 528. Support frame two; 529. Gear three; 530. Transmission rod three; 531. Groove; 532. Hollow threaded rod; 533. Transmission rod four; 534. Internal threaded pipe; 535. Sealing box; 536. Support frame three. DETAILED DESCRIPTION

[0037] The embodiment of the present invention provides a centrifugal pump for automatically controlling drainage variables and an automatic control method thereof.

[0038] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 , Fig.11 , Fig.12 and Fig.13, including a centrifugal pump body 1, a water inlet structure 2 and a water outlet pipe 3, a drainage variable control structure 5 is arranged on one side of the water outlet pipe 3; the drainage variable control structure 5 includes a shell 51, a hydraulic cylinder 58 is fixedly connected to the side of the shell 51 close to the water outlet pipe 3, a moving ring 56, an elastic liquid storage member 55 and an elastic expansion member 52 are arranged in sequence on one end of the hydraulic cylinder 58, a plurality of pressure relief grooves 59 and a plurality of outer boxes 511 are arranged on the outside of the shell 51, the pressure relief grooves 59 are opened on the outside of the shell 51, and L-shaped plates 510 are arranged inside the plurality of outer boxes 511, and the L-shaped plates 510 are arranged on the outside of the shell 51. The end passes through the pressure relief groove 59 and is fixedly connected to the moving ring 56, and a plurality of vertical grooves 512 are provided on the outside of the outer box 511; the extending end of the hydraulic cylinder 58 is fixedly connected to a rack 517, and a gear 522 is meshed on one side of the rack 517, and an electromagnet 521 is arranged inside the gear 522, and a transmission rod 519 is fixedly connected to the inside of the electromagnet 521, and a magnet 520 is sleeved on the top of the outer side of the transmission rod 519, and a hollow threaded rod 532 is rotatably connected to one side of the moving ring 56, and a transmission assembly is arranged between the hollow threaded rod 532 and the transmission rod 519.

[0039] Specifically, the outer shell 51 in the drainage variable control structure 5 is fixedly mounted on the outside of the water outlet pipe 3, and the end of the outer shell 51 away from the water outlet pipe 3 is fixedly connected to the connecting flange 4, the water outlet pipe 3, the outer shell 51 and the connecting flange 4 constitute a discharge channel, the centrifugal pump body 1, the water inlet structure 2 and the discharge channel constitute a centrifugal pump, and the drainage variable control structure 5 plays a role in controlling the drainage volume of the centrifugal pump.

[0040] When the centrifugal pump is working, it is necessary to adjust and control the discharge variable of the centrifugal pump;

[0041] Step 1: Input the flow value to be reduced on the controller or display screen electrically connected to the hydraulic cylinder 58. After the controller or display screen calculates the stroke that the hydraulic cylinder 58 needs to change, the controller or display screen controls the electrically connected hydraulic cylinder 58 to work. The motion ring 56 provided at the extended end of the hydraulic cylinder 58 is provided inside the housing 51. Therefore, after the hydraulic cylinder 58 works, the motion ring 56 will move a certain distance inside the housing 51. Since the elastic liquid storage member 55 is fixedly connected to one side of the motion ring 56, the two fixed rings 53 provided on both sides of the elastic expansion member 52 are fixedly connected to the housing 51, and one end of the elastic liquid storage member 55 is fixedly connected to the adjacent fixed ring 53, so the moving ring 56 squeezes the elastic liquid storage member 55 to shrink a part of it, and a plurality of guide tubes 54 are fixedly connected between the fixed ring 53 and the elastic expansion member 52, so a part of the medium in the elastic liquid storage member 55 enters the elastic expansion member 52 through the plurality of guide tubes 54, and finally the elastic expansion member 52 fixedly connected to the shell 51 expands, and the hollow in the middle of the elastic expansion member 52 shrinks a part, so that the flow discharged into the connection flange 4 through the elastic expansion member 52 decreases;

[0042] Step 2: Since the outer wall of the moving ring 56 contacts the inner wall of the housing 51, and the multiple pressure relief grooves 59 provided in the housing 51 are all disposed between the moving ring 56 and a fixed ring 53, as shown in FIG. Figure 2 As shown, under the action of the moving ring 56, the fixed ring 53 and the elastic liquid storage member 55 fixedly connected between the moving ring 56 and the fixed ring 53, the pressure relief groove 59 is sealed and cannot contact the liquid inside the shell 51; however, after the moving ring 56 moves, the moving ring 56 will drive the multiple L-shaped plates 510 fixedly connected on the outside to move, and one end of the multiple L-shaped plates 510 respectively penetrates the multiple pressure relief grooves 59 opened on the outside of the shell 51, and the smaller end of the L-shaped plate 510 is arranged inside the outer box 511 fixedly connected to the outside of the shell 51, and the inner wall of the outer box 511 against which the smaller end of the L-shaped plate 510 is pressed is provided with multiple vertical grooves 512. After that, a part of the pressure relief groove 59 will be connected with the inside of the shell 51. At this time, the L-shaped plate 510 moves to make a part of the vertical groove 512 connected with the inside of the shell 51 through the pressure relief groove 59. Since the elastic expansion member 52 expands and reduces the water flow entering the connecting flange 4, a part of the water flow is discharged from the inside of the shell 51 through the pressure relief groove 59 and enters the inside of the outer box 511, and then enters the inside of the guide pipe 2 513 arranged on one side of the vertical groove 512 through part of the vertical groove 512. A guide pipe 3 514 is fixedly connected between the plurality of guide pipes 2 513, and a guide pipe 5 516 is fixedly connected to one side of the guide pipe 4 515 fixedly connected between the plurality of guide pipes 3 514. Figure 1 and Figure 2 As shown, a part of the water flow is collected into the inside of the guide pipe four 515 through multiple guide pipes two 513 and multiple guide pipes three 514, and finally flows to the water source connected to the water inlet structure 2 through the guide pipe five 516 fixedly connected to one side of the guide pipe four 515; the L-shaped plate 510 controls the flow rate of the water flow inside the shell 51 discharged through the multiple pressure relief grooves 59 according to the movement distance of the moving ring 56, and while relieving the pressure of the water flow inside the shell 51, it ensures the water flow rate entering the inside of the connecting flange 4 through the middle cavity of the elastic expansion member 52, and adjusts the flow rate and speed of the water discharged from the centrifugal pump by controlling the elastic expansion member 52 inside the shell 51, and changes the method of controlling the variable of the discharged water flow by controlling the working power of the centrifugal pump, so as to avoid the decrease in the impeller speed caused by the decrease in the working power of the centrifugal pump, and the drainage instability or even drainage interruption caused by the decrease in centrifugal suction, thereby ensuring the stable operation of the centrifugal pump.

[0043] A rack 517 is fixedly connected to the extended end of the hydraulic cylinder 58. Fig.12 As shown, a gear 522 is meshed on one side of the rack 517. Figure 8As shown, when the hydraulic cylinder 58 is extended, it drives the gear 1 522 to rotate through the rack 517. At this time, the electromagnet 521 arranged inside the gear 1 522 is in a working state. The electromagnet 521 is adsorbed and fixed to the gear 1 522 by magnetic force, and the electromagnet 521 is fixedly connected to the transmission rod 1 519. Fig.11 As shown, the rotation of gear 1 522 drives the transmission rod 1 519 to rotate through the electromagnet 521, and the mounting frame 518 rotatably sleeved on the outer side of the transmission rod 1 519 is fixedly connected to the housing 51, so the transmission rod 1 519 rotates while being supported and limited, and the two bevel gears 523 of the transmission assembly are respectively fixedly connected to the transmission rod 1 519 and the transmission rod 2 524, and the two bevel gears 523 are meshed together, so the rotating transmission rod 1 519 drives the transmission rod 2 524 to rotate through the two bevel gears 523, and one end of the transmission rod 2 524 is fixedly connected to the gear 2 527, and the gear 3 529 meshed on one side of the gear 2 527 is fixedly connected to the transmission rod 3 530, as shown Fig.10 As shown, the rotating transmission rod 2 524 drives the transmission rod 3 530 to rotate through the gear 2 527 and the gear 3 529; since the hollow threaded rod 532 is fixedly connected with a plurality of transmission rods 4 533, and the plurality of transmission rods 4 533 are respectively arranged in a plurality of grooves 531 provided on the outside of the transmission rod 3 530, the transmission rod 3 530 and the hollow threaded rod 532 are in a sliding connection relationship, and the transmission rod 3 530 can drive the hollow threaded rod 532 to rotate synchronously through the transmission rod 4 533, and the hollow threaded rod 532 can rotate synchronously outside the transmission rod 3 530. and because the internal threaded tube 534 threadedly sleeved on the outer side of the hollow threaded rod 532 is fixedly connected to the outer shell 51, the rotating hollow threaded rod 532 moves under the action of the internal threaded tube 534, and one end of the hollow threaded rod 532 passes through the internal threaded tube 534 and is rotatably connected to the moving ring 56, so the rotating hollow threaded rod 532 drives the moving ring 56 to move, and under the action of the transmission rod 519, the electromagnet 521, and the transmission assembly, the effect of causing the moving ring 56 to move a certain distance inside the outer shell 51 after the hydraulic cylinder 58 works is achieved.

[0044] Step 3: After the centrifugal pump discharge variable is regulated, the electromagnet 521 is controlled to stop working. At this time, the electromagnet 521 stops working, and the fixing between the transmission rod 519 and the gear 522 is removed. Before the transmission rod 519 is subjected to a certain rotation force, the transmission rod 519 cannot rotate; at the same time, the transmission rod 519 and the gear 522 are rotatably installed together through the bearing, such as Fig.11As shown, when the electromagnet 521 is not working, even if the hydraulic cylinder 58 cannot maintain its original state due to accidental power failure, its own failure, accidental touch by the user, etc., and the accidental contraction drives the rack 517 to move, the transmission rod 519 will not rotate under the action of the rack 517 and the gear 522. At this time, the transmission component is not subjected to force, and the hollow threaded rod 532 will not rotate, so that the motion ring 56 supported by the hollow threaded rod 532 maintains the state of squeezing the elastic liquid storage part 55, avoiding the situation that the elastic expansion part 52 automatically contracts after the drainage variable control structure 5 stops working due to accidental power failure, its own failure, accidental touch by the user, etc., and the staff needs to adjust the drainage variable of the centrifugal pump again, thereby ensuring the stability of the operation of the centrifugal pump after the drainage variable is adjusted.

[0045] In addition, such as Figure 5 , Figure 7 and Fig.13 As shown, a support frame 1 525 and a magnet piece 2 526 are rotatably sleeved outside the transmission rod 2 524, and the support frame 1 525 and the magnet piece 2 526 are fixedly connected to the housing 51, and the magnet piece 2 526 is fixedly adsorbed and fixed to the transmission rod 2 524 by magnetic force. The transmission rod 2 524 can rotate only after receiving a certain force, thereby ensuring the stability of the operation of the transmission rod 2 524, preventing the transmission rod 2 524 from rotating due to vibration, and ensuring the stability of the operation of the hollow threaded rod 532;

[0046] One end of the transmission rod 524 passes through the magnet part 526 and extends to the outside of the shell 51. The support frame 528 rotatably mounted on the outside of one end of the transmission rod 524 is fixedly connected to the shell 51, so that the transmission rod 524 is supported by the support frame 1 525 and the support frame 2 528, ensuring the stable rotation of the transmission rod 524.

[0047] In addition, such as Figure 5 and Fig. 9 As shown, a support frame 3 536 and a sealing box 535 are provided on the outer rotating sleeve of the transmission rod 3 530. The support frame 3 536 and the sealing box 535 are both fixedly connected to the outer shell 51. The support frame 3 536 supports the transmission rod 3 530 to enable it to rotate stably. The sealing box 535 provides sealing for structures such as the transmission rod 2 524 and the hollow threaded rod 532 to prevent the transmission component setting from affecting the sealing of the outer shell 51.

[0048] In addition, such as Figure 2 As shown, two telescopic rods 57 are fixedly connected between the moving ring 56 and the outer shell 51. The two telescopic rods 57 can be extended and retracted to support and limit the moving ring 56, so that the moving ring 56 can move horizontally, reducing the wear between the moving ring 56 and the outer shell 51.

Claims

1. A centrifugal pump for automatically controlling the displacement of a centrifugal pump, comprising a centrifugal pump body (1), a water inlet structure (2) and a water outlet pipe (3), characterized in that: A drainage variable control structure (5) is provided on one side of the water outlet pipe (3); the drainage variable control structure (5) comprises a housing (51); a hydraulic cylinder (58) is fixedly connected to a side of the housing (51) close to the water outlet pipe (3); a movement ring (56), an elastic liquid storage member (55) and an elastic expansion member (52) are sequentially provided on one end of the hydraulic cylinder (58); a plurality of pressure relief grooves (59) and a plurality of outer boxes (511) are provided on the outside of the housing (51); the pressure relief grooves (59) are opened on the outside of the housing (51); an L-shaped plate (510) is provided inside each of the plurality of outer boxes (511); one end of the L-shaped plate (510) passes through the pressure relief groove (59) and then The outer box (511) is fixedly connected to the movement ring (56), and a plurality of vertical grooves (512) are formed on the outer side of the outer box (511); the extension end of the hydraulic cylinder (58) is fixedly connected to a rack (517), one side of the rack (517) is meshed with a gear (522), an electromagnet (521) is arranged inside the gear (522), a transmission rod (519) is fixedly connected inside the electromagnet (521), a magnet (520) is sleeved on the outer top of the transmission rod (519), one side of the movement ring (56) is rotatably connected to a hollow threaded rod (532), and a transmission assembly is arranged between the hollow threaded rod (532) and the transmission rod (519); The outer shell (51) is fixedly sleeved on the outside of the water outlet pipe (3); one end of the outer shell (51) away from the water outlet pipe (3) is fixedly connected to a connecting flange (4); the moving ring (56), the elastic liquid storage member (55) and the elastic expansion member (52) are all arranged inside the outer shell (51); and two telescopic rods (57) are fixedly connected between the moving ring (56) and the outer shell (51); There is a distance between the extended end of the hydraulic cylinder (58) and the moving ring (56); the elastic liquid storage member (55) is fixedly connected to one side of the moving ring (56); the elastic expansion member (52) is fixedly connected to the inside of the housing (51); fixed rings (53) are provided on both sides of the elastic expansion member (52); the fixed rings (53) are fixedly connected to the inside of the housing (51); one end of the elastic liquid storage member (55) is fixedly connected to an adjacent fixed ring (53); and a plurality of guide tubes (54) are fixedly connected between the fixed ring (53) and the elastic expansion member (52); A second flow guide pipe (513) is provided on one side of each of the plurality of vertical grooves (512) opened on the outside of the outer box (511); the second flow guide pipe (513) is fixedly connected to the outer box (511); a third flow guide pipe (514) is fixedly connected between the plurality of second flow guide pipes (513); a fourth flow guide pipe (515) is fixedly connected between the plurality of third flow guide pipes (514); and a fifth flow guide pipe (516) is fixedly connected to one side of the fourth flow guide pipe (515).

2. A centrifugal pump for automatically controlling the displacement of a discharge vessel according to claim 1, characterized in that: A mounting frame (518) is rotatably sleeved outside the transmission rod 1 (519); the mounting frame (518) is fixedly connected to the housing (51); and the transmission rod 1 (519) and the gear 1 (522) are rotatably mounted together via a bearing.

3. A centrifugal pump for automatically controlling the displacement of a discharge vessel according to claim 1, characterized in that: The transmission assembly comprises a second transmission rod (524) and two bevel gears (523), the two bevel gears (523) being fixedly connected to the first transmission rod (519) and the second transmission rod (524) respectively, a first support frame (525) and a second magnet member (526) being provided on the outer side of the second transmission rod (524), the first support frame (525) and the second magnet member (526) being fixedly connected to the outer shell (51), one end of the second transmission rod (524) passing through the second magnet member (526) and then extending to the outer side of the outer shell (51), a second support frame (528) being provided on the outer side of one end of the second transmission rod (524), the second support frame (528) being fixedly connected to the outer shell (51).

4. A centrifugal pump for automatically controlling the displacement of a discharge vessel according to claim 3, characterized in that: The transmission assembly comprises a second gear (527), wherein the second gear (527) is fixedly connected to one end of a second transmission rod (524) disposed outside the housing (51), and a third gear (529) is meshed with one side of the second gear (527).

5. A centrifugal pump for automatically controlling the displacement of a discharge vessel according to claim 4, characterized in that: The gear three (529) is fixedly connected to a transmission rod three (530) inside, and a support frame three (536) and a sealing box (535) are provided on the outer rotating sleeve of the transmission rod three (530), and the support frame three (536) and the sealing box (535) are both fixedly connected to the outer shell (51).

6. A centrifugal pump for automatically controlling the displacement of a discharge vessel according to claim 5, characterized in that: The transmission assembly comprises a hollow threaded rod (532), an inner threaded tube (534) is threadedly sleeved on the outer side of the hollow threaded rod (532), the inner threaded tube (534) is fixedly connected to the outer shell (51), one end of the hollow threaded rod (532) passes through the inner threaded tube (534) and is rotatably connected to the moving ring (56), a plurality of transmission rods (533) are fixedly connected inside the hollow threaded rod (532), a plurality of grooves (531) are formed on the outer side of the transmission rod (530), and the plurality of transmission rods (533) are respectively arranged inside the plurality of grooves (531).

7. A centrifugal pump automatic control method for automatically controlling the displacement of a centrifugal pump, applicable to a centrifugal pump for automatically controlling the displacement of a centrifugal pump as claimed in any one of claims 1 to 6, characterized in that: The steps include: Step 1: inputting a flow value to be reduced on a controller or a display screen electrically connected to the hydraulic cylinder (58), and the controller or the display screen controls the electrically connected hydraulic cylinder (58) to work, so that the moving ring (56) moves a certain distance, the elastic expansion member (52) expands, and a part of the hollow in the middle of the elastic expansion member (52) shrinks, so that the flow discharged into the interior of the connecting flange (4) decreases; Step 2: After the movement ring (56) moves, a portion of the water flows out of the housing (51) through the pressure relief groove (59) and enters the outer box (511), and then flows through a portion of the vertical groove (512) into the interior of the second guide pipe (513) provided on one side of the vertical groove (512). The L-shaped plate (510) controls the flow rate of the water flow inside the housing (51) discharged through the plurality of pressure relief grooves (59) according to the movement distance of the movement ring (56), relieves the pressure of the water flow inside the housing (51), and ensures the flow rate and speed of the water flow entering the interior of the connecting flange (4) through the middle hole of the elastic expansion member (52). The elastic expansion member (52) is controlled to adjust the flow rate of the water flow discharged by the centrifugal pump. Step 3, after the centrifugal pump discharge variable is regulated, the control electromagnet (521) stops working, the fixing between the transmission rod 1 (519) and the gear 1 (522) is removed, the transmission rod 1 (519) will not rotate under the action of the rack (517) and the gear 1 (522), and the motion ring (56) maintains the state of squeezing the elastic liquid storage member (55).

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