A new cutting pump

Abstract

The utility model relates to water pump related technical field discloses a novel cutting pump, including motor assembly, shaft connecting portion and pump body, the axial position of pump cavity is set up main water inlet and vice water inlet respectively, the end part fixed setting cutting disc of main water inlet, the axis of impeller is provided with central shaft, one end of central shaft penetrates the shaft center through -hole of cutting disc and fixedly sets up cutting tooth, the side rotation setting of cutting disc away from cutting tooth sets up back -flush disc, central shaft has pressure transmission groove inside, through setting reverse push water mechanism, overcome the deficiency of traditional cutting pump fluid one -way flow channel, provide new solution for excluding blockage, static pressure hose forms bypass pressure -conducting path, the pressure of water outlet acts in pressure transmission groove, directly monitors drainage pressure, triggers back -flush anti -block mechanism quickly, utilizes dynamic pressure change, can intermittent automatic start back -flush mechanism, pure mechanical closed -loop control, has good reliability.

Description

Technical Field

[0001] This utility model belongs to the technical field of water pumps, and more specifically, it relates to a novel cutting pump. Background Technology

[0002] Cutting pumps have cutting blades and cutting discs connected to the impeller shaft. The two work together to cut debris in the water. However, when treating sewage or wastewater containing solid particles or fibrous impurities, they are often equipped with cutting devices to crush large debris and prevent pipeline blockage.

[0003] However, traditional cutting pumps face the following key problems in actual operation:

[0004] When the debris is hard, has strong entanglement, or the instantaneous flow rate is too large, the cutting area is very prone to blockage, which leads to a decrease in impeller speed, a decrease in water intake efficiency, and even equipment shutdown. Existing anti-blockage designs mostly rely on improving the cutting blades to improve cutting efficiency, but the risk of blockage still exists.

[0005] Therefore, in view of this, we have studied and improved the existing structure to provide a new type of cutting pump to solve the technical problem of cutting pump clogging. Utility Model Content

[0006] This invention provides a novel cutting pump to overcome the aforementioned defects in the prior art.

[0007] The purpose and effect of this novel cutting pump are achieved by the following specific technical means:

[0008] This utility model provides a novel cutting pump, including a motor assembly, a shaft connection, and a pump body. The output shaft of the motor assembly is sealed by the shaft connection and the shaft end is connected to an impeller inside the pump body. The pump body includes a pump casing with a pump chamber inside. An impeller is rotatably arranged inside the pump chamber. A main inlet and a secondary inlet are respectively opened at the axial position of the pump chamber. A cutting disc is fixedly arranged at the end of the main inlet. A central shaft is arranged at the axis of the impeller. One end of the central shaft penetrates the axial through hole of the cutting disc and is fixedly arranged with cutting teeth. The cutting teeth rotate relative to the cutting disc to cut debris in the water. A backwash plate is rotatably arranged on the side of the cutting disc away from the cutting teeth. A pressure transmission groove is provided inside the central shaft. A third hole is opened at the end of the pressure transmission groove near the backwash plate. The backwash plate has a high-pressure chamber extending radially. A water spray hole is opened on the side of the high-pressure chamber facing the cutting disc. The third hole can communicate with the high-pressure chamber. A rotary joint is rotatably connected to the end of the central shaft near the cutting teeth. The rotary joint is connected to the outlet of the pump casing through a hydrostatic hose.

[0009] A further technical solution involves a drive shaft fixedly mounted on the output shaft of the motor assembly. The drive shaft is fixedly connected to the impeller, and the shaft connection portion is recessed at the end face facing the impeller to form a low-pressure groove. The end of the drive shaft connected to the impeller has a balance chamber extending along the axis. One end of the central shaft extends into the balance chamber and has a piston that slides within the balance chamber. The piston divides the balance chamber into two chambers. The chamber near the low-pressure groove is the low-pressure area, and its inner wall has a first hole that connects to the low-pressure groove. The other chamber is the high-pressure area, and a pressure transmission groove extends into the high-pressure area. The inner wall of the pressure transmission groove has a second hole that penetrates the high-pressure area.

[0010] A further technical solution involves installing a first spring in the low-pressure zone, which elastically abuts against the piston body, and installing a second spring in the high-pressure zone, which elastically abuts against the piston body.

[0011] A further technical solution is that the backflush disc has a central sleeve at its shaft center, the high-pressure chamber is connected to the central sleeve, the central sleeve is fitted around the central shaft with a gap, the central sleeve has an axially extending toothed groove near the inside of the cutting disc, and the outside of the central shaft has an axially extending toothed structure protruding, the toothed structure can axially extend and limit the central shaft and the backflush disc to rotate synchronously within the toothed groove.

[0012] A further technical solution involves increasing the diameter of the central shaft on the side closest to the tooth groove to form a sealing ring. The sealing ring fits snugly against the inner wall of the central sleeve. A third hole, radially penetrating the sealing ring, is also opened on the inner wall of the pressure transmission groove. The inner diameter of the central sleeve is increased to form a large-diameter hole. The central shaft has two states when it moves axially within the central sleeve: First state: The tooth structure is disengaged from the tooth groove, and the sealing ring is tightly fitted against the inner wall of the central sleeve to seal the third hole; Second state: The tooth structure is engaged with the tooth groove. In this position, the third hole is in the position of the large-diameter hole, and the third hole is no longer sealed. High-pressure water flows into the central sleeve and into the high-pressure chamber from the third hole.

[0013] A further technical solution is that the secondary water inlet consists of multiple arc-shaped channels surrounding the main water inlet, and the end cap of the secondary water inlet is covered with a rotatable sealing structure. The rotation of the sealing structure switches the opening or closing of the secondary water inlet.

[0014] A further technical solution includes an outer ring, which is coaxial with the central sleeve, and forms a flow channel for water to pass through between the outer ring and the central sleeve. A connecting rod is radially arranged inside the flow channel, which fixes the outer ring and the central sleeve together. A high-pressure chamber is opened inside the connecting rod.

[0015] A further technical solution involves increasing the outer diameter of the central shaft to form a first disc, and fixing a second disc at one end of the central sleeve. The central shaft slides within the central sleeve, allowing the first disc to approach the second disc. When the first and second discs are in close contact, friction is generated, driving the central sleeve to rotate coaxially with the central shaft.

[0016] A further technical solution is that the surface of the second disc near the first disc has a first tooth, and the surface of the first disc near the second disc has a second tooth, with the first tooth and the second tooth engaging with each other to transmit torque.

[0017] A further technical solution involves a drive structure on the pump casing that drives the sealing structure to switch the secondary inlet. The sealing structure is also hinged with a flow-blocking fan blade. A limit groove is provided on the flow-blocking fan blade, and a slide rod is slidably installed in the limit groove. One end of the slide rod is fixed to the pump casing. The sealing structure drives the hinged end of the flow-blocking fan blade to rotate, and the slide rod slides in the limit groove to change the angle between the hinge point and the slide rod, thereby adjusting the angle of inward rotation of the flow-blocking fan blade.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This application overcomes the shortcomings of traditional cutting pumps with a reverse push mechanism, providing a new solution for removing blockages. Furthermore, by setting up a static pressure hose to form a bypass pressure-conducting path, the pressure at the outlet is applied to the pressure transmission groove, directly monitoring the drainage pressure. When debris causes impeller deceleration or a decrease in main inlet flow, the reduced outlet water pressure immediately breaks the force balance of the piston body in the balance chamber. Under the action of the first spring, the piston body drives the central shaft to move axially, quickly triggering the backwash anti-blockage mechanism. Utilizing dynamic pressure changes, the backwash mechanism can be intermittently and automatically activated, providing pure mechanical closed-loop control with excellent reliability.

[0020] To improve the backwashing and anti-clogging effect and avoid the weakening effect caused by a single inlet, this application also designs an auxiliary inlet and a flow-blocking fan blade that can self-adaptively swing. When the backwashing mechanism is activated, the flow-blocking fan blade will rotate inward relative to the hinge point so that the flow-blocking fan blade is exposed in the inlet channel, thereby reducing the inlet area of ​​the main inlet, thereby redistributing the inflow ratio, increasing the flow velocity flowing into the pump body from the auxiliary inlet, and reducing the flow velocity flowing into the main inlet, thus improving the backwashing effect of the high-pressure water. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is an overall sectional view of the present invention;

[0024] Figure 2 yes Figure 1 Partial sectional view of the central shaft connection 11 and the pump body 12;

[0025] Figure 3 yes Figure 2 Enlarged view of point A in the middle;

[0026] Figure 4 yes Figure 2 Enlarged schematic diagram of point 16 of the main water inlet;

[0027] Figure 5 This is a schematic diagram of the structure of the cutting disc 31 in this utility model;

[0028] Figure 6 This is a schematic diagram of the structure of the central shaft 24 and the central sleeve 36 in Embodiment 1 of this utility model;

[0029] Figure 7 This is a schematic diagram of the structure of the central shaft 24 and the central sleeve 36 in Embodiment 2 of this utility model;

[0030] Figure 8 This is a schematic diagram of the structure of the first tray 52 and the second tray 53 in Embodiment 2 of this utility model;

[0031] Figure 9 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 10 This is a side view of the present invention with the sealing structure 40 and telescopic rod 56 removed;

[0033] Figure 11 This is a schematic diagram of the back structure of the sealing structure 40 in this utility model;

[0034] Figure 12 This is a front view of the sealing structure 40 in this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10 Motor assembly, 11 Shaft connection, 12 Pump body, 13 Outlet, 14 Static pressure hose, 15 Pump chamber, 16 Main inlet, 17 Low-pressure groove, 18 Drive shaft, 19 Impeller, 21 Balance chamber, 22 First hole, 23 First spring, 24 Central shaft, 25 Pressure transmission groove, 27 Piston body, 28 Second hole, 29 Second spring, 30 Cutting tooth, 31 Cutting disc, 32 Backflush disc, 33 Third hole, 34 High-pressure chamber, 35 Spray hole, 36 Central sleeve, 37 Tooth structure, 38 Rotary joint, 39 Secondary inlet, 40 Sealing structure, 41 Outer ring, 42 Connecting rod, 43 Flow channel, 50 Large diameter hole, 51 Sealing ring, 52 First disc, 53 Second disc, 54 First tooth, 55 Second tooth, 56 Telescopic rod, 57 Through groove, 58 Seal, 59 Limiting slide groove, 60 Slide rod, 61 Flow-blocking fan blade. Detailed implementation method

[0037] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0038] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] See attached document Figure 1 - Appendix Figure 10This utility model provides a novel cutting pump, including a motor assembly 10, a shaft connection 11, and a pump body 12. The output shaft of the motor assembly 10 is sealed by the shaft connection 11 and its end is connected to an impeller 19 inside the pump body 12. The pump body 12 includes a pump casing, and the pump casing has a pump chamber 15 inside. The impeller 19 is rotatably arranged inside the pump chamber 15. A main inlet 16 and a secondary inlet 39 are respectively opened at the axial position of the pump chamber 15. A cutting disk 31 is fixedly arranged at the end of the main inlet 16. A central shaft 24 is arranged at the axis of the impeller 19. One end of the central shaft 24 penetrates the axial through hole of the cutting disk 31 and is fixedly arranged with cutting teeth. 30. The cutting teeth 30 rotate relative to the cutting disc 31 to cut debris in the water. The backwash disc 32 is rotatably mounted on the side of the cutting disc 31 away from the cutting teeth 30. The central shaft 24 has a pressure transmission groove 25 inside. A third hole 33 is opened at the end of the pressure transmission groove 25 near the backwash disc 32. The backwash disc 32 has a high-pressure chamber 34 extending radially. A water spray hole 35 is opened on the side of the high-pressure chamber 34 facing the cutting disc 31. The third hole 33 can communicate with the high-pressure chamber 34. A rotary joint 38 is rotatably connected to the end of the central shaft 24 near the cutting teeth 30. The rotary joint 38 is connected to the outlet 13 of the pump casing through a static pressure hose 14.

[0041] Preferably, the output shaft of the motor assembly 10 is fixedly provided with a drive shaft 18, which is fixedly connected to the impeller 19. The shaft connection part 11 is recessed towards the end face of the impeller 19 to form a low-pressure groove 17. The end of the drive shaft 18 connected to the impeller 19 has a balance cavity 21 extending along the axis. One end of the central shaft 24 extends into the balance cavity 21 and has a piston body 27 that slides in the balance cavity 21. The piston body 27 divides the balance cavity 21 into two chambers. The chamber near the low-pressure groove 17 is the low-pressure area, and its inner wall has a first hole 22 that communicates with the low-pressure groove 17. The other chamber is the high-pressure area, and the pressure transmission groove 25 extends into the high-pressure area. The inner wall of the pressure transmission groove 25 has a second hole 28 that penetrates the high-pressure area.

[0042] Specifically, the piston body 27 and the balance chamber 21 are connected by a spline. The rotation of the drive shaft 18 can drive the central shaft 24 to rotate synchronously, but does not restrict the central shaft 24 from moving axially relative to the drive shaft 18.

[0043] Preferably, a first spring 23 is provided in the low-pressure zone, and the first spring 23 elastically abuts against the piston body 27; a second spring 29 is provided in the high-pressure zone, and the second spring 29 elastically abuts against the piston body 27.

[0044] Preferably, the recoil disc 32 has a central sleeve 36 at its axial center, the high-pressure chamber 34 is connected to the central sleeve 36, the central sleeve 36 is fitted around the central shaft 24 with a gap, the central sleeve 36 has an axially extending toothed groove near the interior of the cutting disc 31, and the exterior of the central shaft 24 has an axially extending toothed structure 37 protruding, the toothed structure 37 can axially and limit the central shaft 24 and the recoil disc 32 to rotate synchronously within the toothed groove.

[0045] Preferred, such as Figure 6 As shown, the diameter of the central shaft 24 is increased on the side near the tooth groove to form a sealing ring 51. The sealing ring 51 fits against the inner wall of the central sleeve 36. The inner wall of the pressure transmission groove 25 also has a third hole 33 that radially penetrates the sealing ring 51. The inner diameter of the central sleeve 36 is increased to form a large-diameter hole 50. The central shaft 24 has two states in the axial displacement within the central sleeve 36. In the first state, the tooth structure 37 is disengaged from the tooth groove, and the sealing ring 51 is tightly fitted by the inner wall of the central sleeve 36 to seal the third hole 33. In the second state, the tooth structure 37 is engaged with the tooth groove. In this position, the third hole 33 is in the position of the large-diameter hole 50. The third hole 33 is out of the sealing state, and high-pressure water flows into the central sleeve 36 from the third hole 33 and into the high-pressure chamber 34.

[0046] Preferably, the secondary water inlet 39 is a plurality of arc-shaped through grooves surrounding the main water inlet 16, and the end cap of the secondary water inlet 39 is covered with a sealing structure 40 that can rotate in an annular shape. The sealing structure 40 rotates to switch the opening or closing of the secondary water inlet 39.

[0047] Preferably, the backflushing plate 32 further includes an outer ring 41, which is coaxial with the central sleeve 36, and forms a flow channel 43 for water to pass through between the outer ring 41 and the central sleeve 36. A connecting rod 42 is radially arranged inside the flow channel 43, which fixes the outer ring 41 and the central sleeve 36 together. A high-pressure chamber 34 is opened inside the connecting rod 42.

[0048] Example 2, as Figure 7 As shown, the difference from Embodiment 1 is that this embodiment uses a toothed disc structure to replace the tooth structure 37 and the tooth groove mating structure in Embodiment 1.

[0049] Specifically, the outer diameter of the central shaft 24 is increased to form the first disk 52, and the second disk 53 is fixedly installed at one end of the central sleeve 36. The central shaft 24 slides in the central sleeve 36, which allows the first disk 52 to approach the second disk 53. After the first disk 52 and the second disk 53 are in close contact, friction is generated to drive the central sleeve 36 to rotate coaxially with the central shaft 24.

[0050] Preferably, the surface of the second disc 53 near the first disc 52 has a first tooth 54, and the surface of the first disc 52 near the second disc 53 has a second tooth 55. The first tooth 54 and the second tooth 55 engage with each other to transmit torque.

[0051] Preferably, the pump casing is also provided with a drive structure for the sealing structure 40 to switch the secondary water inlet 39. The drive structure includes a telescopic rod 56, one end of which is hinged to the pump casing and the other end of which is hinged to the sealing structure 40. The sealing structure 40 is an annular structure with a corresponding through groove 57 for the secondary water inlet 39. A filter screen is installed in the through groove 57, and a flow-blocking fan blade 61 is installed in the space between adjacent filter grooves. The flow-blocking fan blade 61 slides to the secondary water inlet 39 and can tightly seal the secondary water inlet 39. Specifically, the sealing element is a rubber gasket.

[0052] Preferably, a flow-restricting fan blade 61 is also hinged to the sealing structure 40. A limiting groove 59 is provided on the flow-restricting fan blade 61. A sliding rod 60 is slidably arranged in the limiting groove 59. One end of the sliding rod 60 is fixed to the pump casing. The sealing structure 40 drives the hinged end of the flow-restricting fan blade 61 to rotate. The sliding rod 60 slides in the limiting groove 59 to change the angle between the hinge point and the sliding rod 60, thereby adjusting the angle of inward rotation of the flow-restricting fan blade 61.

[0053] The working process of this device:

[0054] In the default working state, driven by the motor assembly 10, the impeller 19 rotates, and the telescopic rod 56 drives the sealing structure 40 to seal the secondary water inlet 39. Water can only be drawn into the pump chamber 15 through the main water inlet 16 and discharged through the outlet 13. At the same time, the transmission shaft 18 drives the central shaft 24 to rotate synchronously. The central shaft 24 drives the cutting teeth 30 to rotate relative to the cutting disc 31 to achieve the effect of cutting debris in the water.

[0055] During the cutting process, debris inevitably causes blockage, affecting the water intake of the main inlet 16 or reducing the rotational speed of the impeller 19. In either case, the water pressure inside the outlet 13 decreases, leading to a reduction in the water output speed. In this situation, the water pressure is transmitted to the pressure transmission groove 25 through the static pressure hose 14, disrupting the balance position of the piston body 27 in the balance chamber 21. Figure 3 As shown, the pressure in the high-pressure zone decreases, while the pressure in the low-pressure zone remains essentially unchanged. Under the action of the first spring 23, the piston body 27 will move to the right, thereby causing the central shaft 24 to move to the right. Figure 4As shown, when the central shaft 24 is in its default state, the tooth structure 37 is disengaged from the tooth groove, and the third hole 33 is not connected to the high-pressure chamber 34. At this time, the backwash plate 32 will not perform reverse water spraying. However, as the central shaft 24 moves to the right, the tooth structure 37 engages with the tooth groove, and the third hole 33 connects to the high-pressure chamber 34. At this time, the high-pressure water inside the static pressure hose 14 will be sprayed out through the high-pressure chamber 34 and the spray hole 35. The power for water spraying comes from two sources: one is the original high pressure inside the static pressure hose 14, and the other is the centrifugal force caused by the radial extension trend of the high-pressure chamber 34, which further increases the power for reverse water spraying from the spray hole 35. Under the action of the two phases, the high-pressure water sprayed out from the spray hole 35 sprays towards the cutting disc 31 and the cutting teeth 30. Since the cutting teeth 30 will move away from the cutting disc 31 a certain distance with the movement of the central shaft 24, it provides a gap for reverse water spraying for high-pressure water cleaning, further enhancing the efficiency of debris removal.

[0056] To mitigate the conflict between the pump body's inlet fluid and the reverse-jet fluid, as the backwash plate 32 rotates, the telescopic rod drives the sealing structure 40 to rotate until the auxiliary inlet 39 connects with the water body. The water can then flow into the pump body from the auxiliary inlet 39, thereby reducing the inlet velocity of the main inlet 16 and enhancing the anti-clogging effect of the reverse-jet. Furthermore, to further reduce the inlet fluid velocity, as the sealing structure 40 rotates, the flow-blocking fan blade 61 rotates inward relative to the hinge point due to the cooperation between the slide rod 60 and the limiting slide groove 59. This exposes the flow-blocking fan blade 61 in the inlet channel, reducing the inlet area of ​​the main inlet 16. This redistributes the inlet ratio, increases the flow velocity flowing into the pump body from the auxiliary inlet 39, and reduces the flow velocity flowing into the main inlet 16, providing a working environment for high-pressure water backwash.

[0057] The embodiments of this utility model are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the utility model to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical applications of this utility model, and to enable those skilled in the art to understand this utility model and design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A novel cutting pump, comprising a motor assembly, a shaft connection portion, and a pump body, wherein the output shaft of the motor assembly is surrounded and sealed by the shaft connection portion, and its shaft end is connected to an impeller inside the pump body, characterized in that, The pump body includes a pump casing with a pump chamber inside. An impeller is rotatably mounted inside the pump chamber. A main inlet and a secondary inlet are respectively opened at the axial position of the pump chamber. A cutting disc is fixedly mounted at the end of the main inlet. A central shaft is set at the axis of the impeller. One end of the central shaft penetrates the axial through hole of the cutting disc and is fixedly mounted with cutting teeth. The cutting teeth rotate relative to the cutting disc to cut debris in the water. A backwash disc is rotatably mounted on the side of the cutting disc away from the cutting teeth. A pressure transmission groove is inside the central shaft. A third hole is opened at the end of the pressure transmission groove near the backwash disc. The backwash disc has a high-pressure chamber extending radially. A water spray hole is opened on the side of the high-pressure chamber facing the cutting disc. The third hole can communicate with the high-pressure chamber. A rotary joint is rotatably connected to the end of the central shaft near the cutting teeth. The rotary joint is connected to the outlet of the pump casing through a hydrostatic hose.

2. The novel cutting pump according to claim 1, characterized in that, The output shaft of the motor assembly is fixedly equipped with a drive shaft, which is fixedly connected to the impeller. The shaft connection portion is recessed towards the end face of the impeller to form a low-pressure groove. The end of the drive shaft connected to the impeller has a balance cavity extending along the axis. One end of the central shaft extends into the balance cavity and has a piston body that slides within the balance cavity. The piston body divides the balance cavity into two chambers. The chamber near the low-pressure groove is a low-pressure area, and its inner wall has a first hole communicating with the low-pressure groove. The other chamber is a high-pressure area, and the pressure transmission groove extends into the high-pressure area. The inner wall of the pressure transmission groove has a second hole penetrating the high-pressure area.

3. A novel cutting pump according to claim 2, characterized in that, A first spring is provided in the low-pressure zone, and the first spring elastically abuts against the piston body. A second spring is provided in the high-pressure zone, and the second spring elastically abuts against the piston body.

4. A novel cutting pump according to claim 1, characterized in that, The recoil disc has a central sleeve at its axis, and the high-pressure chamber is connected to the central sleeve. The central sleeve is fitted around the central shaft with a gap. The central sleeve has an axially extending toothed groove near the interior of the cutting disc. The exterior of the central shaft has an axially extending toothed structure. The toothed structure can axially extend within the toothed groove and can limit the central shaft to rotate synchronously with the recoil disc.

5. A novel cutting pump according to claim 4, characterized in that, The central shaft has an increased diameter on the side closest to the tooth groove to form a sealing ring. The sealing ring fits against the inner wall of the central sleeve. The inner wall of the pressure transmission groove also has a third hole that radially penetrates the sealing ring. The inner diameter of the central sleeve is increased to form a large-diameter hole. The central shaft has two axial displacement states within the central sleeve: In the first state position, the tooth structure is disengaged from the tooth groove, and the sealing ring is tightly fitted to the inner wall of the central sleeve to seal the third hole; In the second state position, the tooth structure is engaged with the tooth groove. In this position, the third hole is located at the position of the large diameter hole. The third hole is out of the sealed state, and high-pressure water flows from the third hole into the central sleeve and into the high-pressure chamber.

6. A novel cutting pump according to claim 1, characterized in that, The secondary water inlet consists of multiple arc-shaped channels surrounding the main water inlet. The end cap of the secondary water inlet is covered with a rotatable sealing structure. The sealing structure rotates to switch the opening or closing of the secondary water inlet.

7. A novel cutting pump according to claim 4, characterized in that, The backwash plate also includes an outer ring, which is coaxial with the central sleeve, and forms a flow channel for water to pass through between the outer ring and the central sleeve. A connecting rod is radially arranged in the flow channel, which fixes the outer ring and the central sleeve together. The high-pressure chamber is opened in the connecting rod.

8. A novel cutting pump according to claim 4, characterized in that, The outer diameter of the central shaft is increased to form a first disk, and a second disk is fixedly disposed at one end of the central sleeve. The central shaft slides in the central sleeve to bring the first disk close to the second disk. After the first disk and the second disk are in close contact, friction is generated to drive the central sleeve to rotate coaxially with the central shaft.

9. A novel cutting pump according to claim 8, characterized in that, The second disc has a first tooth on the surface near the first disc, and the first disc has a second tooth on the surface near the second disc. The first tooth and the second tooth engage with each other to transmit torque.

10. A novel cutting pump according to claim 6, characterized in that, The pump casing is also provided with a drive structure for driving the switch of the sealing structure to open the secondary water inlet. The sealing structure is also hinged with a flow-blocking fan blade. A limit groove is formed on the flow-blocking fan blade. A slide rod is slidably arranged in the limit groove. One end of the slide rod is fixed to the pump casing. The sealing structure drives the hinge end of the flow-blocking fan blade to rotate. The slide rod slides in the limit groove to change the angle between the hinge point and the slide rod, thereby adjusting the angle of inward rotation of the flow-blocking fan blade.

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