An anti-tangling submersible sewage pump

Abstract

This invention relates to the field of axial flow pumps, and in particular to an anti-winding submersible sewage pump, comprising a spiral pump shaft, which is a spiral cylindrical spring with a circular cross-section, made of a lightweight elastic material, and used to drive sewage when rotating; a sleeve and an adapter seat, wherein a drive shaft is inserted between the sleeve and the adapter seat, and the end of the drive shaft is helically slidably connected to the sleeve. This invention's anti-winding submersible sewage pump retains the anti-winding advantages of its prototype auger sewage pump while achieving the effect of automatically adjusting the working pitch of the spiral pump shaft according to changes in the viscosity of the working medium. It can adaptively adjust the sewage flow rate and sewage thrust under drastic changes in sewage viscosity, and can also significantly reduce the impact force on the drive motor under drastic changes in sewage viscosity. Incidentally, it also reduces the current load changes of the drive motor controller, protects the electrical components of the equipment, and reduces the performance requirements of the electrical components, thereby reducing the electrical hardware cost of the equipment.

Description

Technical Field

[0001] This invention relates to the field of axial flow pumps, and in particular to an anti-winding submersible sewage pump. Background Technology

[0002] The blades of the auger sewage pump are spiral ribbon-shaped. Compared with other conventional axial or centrifugal blades, it is characterized by a lower flow velocity but stable pressure. Thanks to its continuous spiral ribbon-shaped blades, the auger sewage pump can stably transport fluids with large viscosity variations and can easily handle sewage with complex components such as particulate matter, ropes and fabrics.

[0003] Currently, submersible sewage pumps using helical blades on the market have fixed pitch helical blades, which are generally directly welded onto a long rotating shaft. Although fixed-pitch blades are easier to manufacture and cost-effective, they also have significant drawbacks. They are less adaptable to fluids of different viscosities. For example, during sewage discharge, if the originally highly fluid sewage is suddenly pumped into sludge or similar materials, the fluid viscosity will increase sharply. This will cause two problems: First, the sudden increase in fluid viscosity will instantly overload the drive motor, posing a challenge to both the motor and its controller. Therefore, for safety redundancy, a higher power and torque motor and a higher power controller are required, which is detrimental to the size and manufacturing cost of the equipment. Second, large-pitch blades obviously have an advantage in terms of sewage discharge velocity compared to small-pitch blades, while small-pitch blades can provide higher thrust in the axial direction. It is impossible to achieve both the sewage discharge thrust and sewage discharge velocity with a fixed pitch blade.

[0004] To address the aforementioned issues, a submersible sewage pump with anti-winding capability is proposed, which can automatically adjust the working pitch according to changes in the viscosity of the working medium. Summary of the Invention

[0005] In view of the problems in the above or existing technologies, such as the high requirements for motor power and torque redundancy of fixed-pitch spiral belt sewage pumps when the viscosity of the working medium changes drastically, which increases the equipment cost, and the problem that the sewage thrust and sewage flow rate of fixed-pitch spiral belt sewage pumps cannot be simultaneously achieved, which leads to reduced compatibility with the operating environment, this invention is proposed.

[0006] Therefore, the object of the present invention is to provide an anti-tangling submersible sewage pump.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an anti-entanglement submersible sewage pump, comprising: a spiral pump shaft, which is a spiral cylindrical spring-shaped pump with a circular cross-section, made of a lightweight elastic material, used to drive sewage when rotating; a sleeve and an adapter seat, wherein a drive shaft is inserted between the sleeve and the adapter seat, the end of the drive shaft is spirally slidably connected to the sleeve, and the sliding distance of the adapter seat along the drive shaft away from the sleeve is limited, the spiral pump shaft is wound around the sleeve, and both ends of the spiral pump shaft are respectively connected to the sleeve and the adapter seat; a housing and a rotating cylinder, wherein the rotating cylinder is slidably sleeved outside the spiral pump shaft, forming a spiral flow channel for driving sewage with the sleeve and the spiral pump shaft and limiting the spiral diameter of the spiral pump shaft, and the rotating cylinder is sealed and rotatably sleeved inside the housing to reduce rotational resistance in sewage; a hollow shaft motor, the stator of which is connected to the flange on the end face of the housing, and the drive shaft is slidably inserted along the axial direction of the hollow shaft motor with only one degree of freedom.

[0008] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, the spiral pump shaft is made of polymer material, and the outer wall of the spiral shaft and the inner wall of the spiral shaft are both inlaid with wear-resistant metal strips matching their spiral lines. When the spiral pump shaft extends and retracts in the axial direction, the two wear-resistant strips replace the spiral pump shaft in rubbing against the rotating drum and the sleeve.

[0009] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, wherein: the spiral pump shaft is hollow, and both ends of the spiral pump shaft are connected to metal adapters through the hollow structure; both adapters and both ends of the spiral pump shaft are cut with stabilizing surfaces along a plane perpendicular to the axis of the spiral body; the end of the adapter seat and the sleeve away from the adapter seat respectively fits against the stabilizing surfaces on the two adapters and is fastened with screws.

[0010] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, one end of the sleeve is fixedly inserted into the bottom of the rotating drum, and a limit snap ring is provided at the end of the transmission shaft located away from the sleeve at the adapter seat.

[0011] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, the rotating drum and the outer shell are both cylindrical and inserted with their openings facing each other. The bottom of the rotating drum is provided with a fan-shaped liquid inlet groove, and the peripheral wall of the rotating drum is provided with a drain groove in a ring array at the opening. The outer shell is provided with a flange interface corresponding to the drain groove.

[0012] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, three sealed bearings are provided between the outer shell and the rotating drum, one on each side of the drain trough and one at the opening of the outer shell.

[0013] As a preferred embodiment of the anti-winding submersible sewage pump of the present invention, a shaft seal is provided between the outer casing and the drive shaft, and the position of the shaft seal is fixed relative to the outer casing.

[0014] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, wherein: the spiral groove of the drive shaft and the sleeve is spiraled in the same direction as the spiral pump shaft.

[0015] As a preferred embodiment of the anti-winding submersible sewage pump of the present invention, a bellows cover is provided between the sleeve and the adapter seat, the bellows cover is sleeved on the rotating shaft, and one end of the bellows cover is sealed to the flange of the adapter seat, and a sealing ring is sealed between the other end of the bellows cover and the edge of the sleeve end, and the sealing ring has a concave cross-section.

[0016] As a preferred embodiment of the anti-entanglement submersible sewage pump of the present invention, wherein: the hollow shaft motor is an external rotor type, and a sealing cover is sleeved between the hollow shaft motor and the transmission shaft that passes through its output shaft, and a counterweight is fixed on the outer wall of the rotating drum.

[0017] The beneficial effects of the anti-tangling submersible sewage pump of the present invention are as follows:

[0018] 1. The present invention provides an anti-winding submersible sewage pump that retains the anti-winding advantages of its prototype screw pump while achieving the effect of automatically adjusting the working pitch of the screw pump shaft according to the viscosity change of the working medium. It can adaptively adjust the sewage flow rate and sewage thrust in the face of drastic changes in sewage viscosity.

[0019] 2. The anti-entanglement submersible sewage pump of the present invention can also significantly reduce the impact force on the drive motor during drastic changes in sewage viscosity, and incidentally reduce the current load change of the drive motor controller, thereby protecting the electrical parts of the equipment and reducing the performance requirements of the electrical parts, thus reducing the electrical hardware cost of the equipment. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of a submersible sewage pump designed to prevent tangling.

[0022] Figure 2 for Figure 1 A schematic diagram of the structure after the outer shell and sealing cover have been cut open.

[0023] Figure 3 This is a schematic diagram showing the location distribution of the sealing bearings between the outer casing and the rotating cylinder.

[0024] Figure 4 This is a cross-sectional view of the assembly structure of the screw pump shaft.

[0025] Figure 5 This is a schematic diagram of the shaft of a spiral pump.

[0026] Figure 6 This is a sectional view of the assembly structure of the sleeve, adapter, and drive shaft.

[0027] Figure 7 for Figure 6 A partial structural breakdown diagram.

[0028] Figure 8 This is an exploded view of the screw pump shaft.

[0029] Figure 9 for Figure 8 Enlarged view of the structure at point A in the middle.

[0030] In the diagram: 100, screw pump shaft; 1001, wear-resistant strip; 1002, adapter; 1003, stabilizer; 101, sleeve; 102, adapter seat; 103, drive shaft; 104, outer casing; 1041, flange interface; 105, rotating drum; 1051, inlet tank; 1052, outlet tank; 106, hollow shaft motor; 107, limit snap ring; 108, sealed bearing; 109, shaft seal; 110, bellows cover; 111, sealing ring; 112, sealing cover; 113, counterweight. Detailed Implementation

[0031] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0032] Example, refer to Figures 1-9 This embodiment provides an anti-winding submersible sewage pump that can automatically adjust the working pitch according to changes in the viscosity of the working medium, such as... Figure 4 As shown, it includes a spiral pump shaft 100, which is a spiral cylindrical spring with a circular cross-section, made of a lightweight elastic material, and is used to drive sewage when rotating; as Figure 6 The sleeve 101 and adapter 102 are shown. A drive shaft 103 is inserted between the sleeve 101 and the adapter 102. The end of the drive shaft 103 is helically slidably connected to the sleeve 101. The sliding distance of the adapter 102 along the drive shaft 103 away from the sleeve 101 is limited. Figure 5 The spiral pump shaft 100 shown is wound around the sleeve 101, and both ends of the spiral pump shaft 100 are respectively connected to the sleeve 101 and the adapter 102; as shown Figure 4The outer casing 104 and the rotating drum 105 are shown. The rotating drum 105 is slidably sleeved outside the screw pump shaft 100, forming a screw flow channel for driving sewage with the sleeve 101 and the screw pump shaft 100, and limiting the screw diameter of the screw pump shaft 100. Figure 3 As shown, the rotating drum 105 is sealed and rotated within the outer casing 104 to reduce rotational resistance in sewage; as Figure 2 The hollow shaft motor 106 shown has its stator connected to the end flange of the housing 104, and the drive shaft 103 is slidably connected along the axial direction of the hollow shaft motor 106 with only one degree of freedom.

[0033] The specific structure is as follows:

[0034] refer to Figure 4 Both the rotating drum 105 and the outer casing 104 are cylindrical and interlocked with their openings facing each other. The bottom of the rotating drum 105 has a fan-shaped liquid inlet groove 1051, and the peripheral wall of the rotating drum 105 has a drainage groove 1052 arranged in a ring array at the opening. The outer casing 104 has a flange interface 1041 corresponding to the drainage groove 1052. (See reference...) Figure 2 and Figure 3 Three sealed bearings 108 are provided between the outer shell 104 and the rotating drum 105, one on each side of the drain trough 1052 and one at the opening of the outer shell 104.

[0035] refer to Figure 6 and Figure 7 A shaft seal 109 is provided between the outer casing 104 and the drive shaft 103, and the position of the shaft seal 109 is fixed relative to the outer casing 104. The spiral groove of the drive shaft 103 and the sleeve 101 is spiraled in the same direction as the spiral pump shaft 100. One end of the sleeve 101 is fixedly inserted into the bottom of the rotating drum 105, and a limit snap ring 107 is provided at the end of the drive shaft 103 located on the adapter seat 102 away from the sleeve 101.

[0036] refer to Figure 6 A bellows cover 110 is provided between the sleeve 101 and the adapter 102. The bellows cover 110 is fitted onto the rotating shaft, and one end of the bellows cover 110 is sealed to the flange of the adapter 102. A sealing ring 111 is fitted between the other end of the bellows cover 110 and the edge of the end of the sleeve 101. The sealing ring 111 has a concave cross-section. The hollow shaft motor 106 is an external rotor type, and a sealing cover 112 is fitted between the hollow shaft motor 106 and the drive shaft 103 that passes through its output shaft to prevent sewage from contacting the drive shaft 103.

[0037] This invention improves upon conventional auger sewage pumps to provide an anti-winding submersible sewage pump. The main feature is a function that adaptively adjusts the pitch of the screw pump shaft 100 according to changes in fluid viscosity. When fluid viscosity increases, the load on the hollow shaft motor 106 is slightly increased, compressing and reducing the pitch of the screw pump shaft 100. This allows the device to sacrifice sewage flow rate in exchange for higher thrust to remove the high-viscosity portion. Conversely, when fluid viscosity decreases and fluidity is high, the force between the hollow shaft motor 106 and the screw pump shaft 100 decreases, and the pitch of the screw pump shaft 100 increases to improve the sewage flow rate.

[0038] The specific workflow is as follows, please refer to... Figure 4 With the outer casing 104 as the reference frame, the hollow shaft motor 106 remains relatively stationary, driving the transmission shaft 103 to rotate. Figure 6 When the drive shaft 103 rotates, through the spiral sliding insertion structure between it and the sleeve 101, the drive shaft 103 tends to screw into the sleeve 101. However, at the same time, the limiting snap ring 107 abuts against the side of the adapter seat 102 away from the spiral pump shaft 100. Under the elastic support of the spiral pump shaft 100, the drive shaft 103 is prevented from screwing into the sleeve 101. Therefore, the torque can be transmitted, and the drive shaft 103 drives the sleeve 101, the spiral pump shaft 100, the adapter seat 102 and the rotating drum 105 to rotate together.

[0039] The rotational force between the aforementioned transmission components and the elastic force of the spiral pump shaft 100 achieve a state of equilibrium. However, changes in fluid viscosity can disrupt this force balance. If the device suddenly draws in viscous substances such as sludge or feces, the resistance of the spiral pump shaft 100 in pushing the sewage will increase significantly, inhibiting the rotation of the spiral pump shaft 100. Consequently, the spiral pump shaft 100 rotates at a slower speed, while the output speed of the hollow shaft motor 106 remains relatively constant. This increases the force between the hollow shaft motor 106 and the spiral pump shaft 100. The spiral groove connecting the transmission shaft 103 and the sleeve 101 converts this increased torque into a strong thrust in the axial direction, forcing the limit spring 107 to push the adapter seat 102 to squeeze the spiral pump shaft 100, reducing its pitch. Thus, at the same rotational speed, a higher thrust of the spiral pump shaft 100 is achieved by sacrificing the sewage flow rate, allowing the highly viscous sewage to be discharged.

[0040] The present invention also involves the following technical details in achieving the above-mentioned objective function: In a typical auger sewage pump, a metal spiral belt is used as a rotating component. However, when the pitch of such blades is adjusted by simply stretching or compressing, the diameter of the spiral body will also change. When the pitch is reduced by compression, the diameter will increase, and vice versa. This will cause the spiral blades to squeeze the outer shell 104 or the gap to increase. The former will cause the operation to be blocked or jammed, and the latter will seriously reduce the working efficiency of the equipment. Therefore, to achieve the adjustment of the extension and retraction pitch of the sewage pump spiral blades, the assembly problem of the spiral blades in the process must be solved.

[0041] The aforementioned technical problem is characterized by the fact that the spiral blades rotate at high speed relative to the shell surrounding them, which causes the spiral blades to become blocked or jammed when they come into contact with the inner wall of the shell.

[0042] This invention employs a technique where the rotating drum 105, the spiral pump shaft 100, and the sleeve 101 rotate together. In this invention, the spiral pump shaft 100 is allowed to be squeezed against the inner wall of the rotating drum 105 that encloses it. Therefore, the spiral diameter of the spiral pump shaft 100 at its maximum working pitch is used as the inner diameter of the rotating drum 105. This ensures that when the spiral pump shaft 100 is adjusted within its working pitch range, the outer side of the spiral pump shaft 100 always contacts the inner wall of the rotating drum 105. Furthermore, since the diameter of the spiral pump shaft 100 does not change, the inner side of the spiral pump shaft 100 can also always contact the sleeve 101. This ensures that the spiral flow channel formed between the spiral pump shaft 100, the rotating drum 105, and the sleeve is always effective. This design also directly eliminates the need for other complex conventional sealing methods.

[0043] The outer casing 104 is responsible for supporting the aforementioned structure, connecting the pipes to lead out sewage, and preventing the rotating drum 105 from being directly exposed to sewage. Since some sewage has relatively high viscosity (e.g., septic tank wastewater), direct contact with the outer wall of the rotating drum 105 would severely impede its rotation, leading to increased energy consumption. Additionally, refer to... Figure 3 A counterweight 113 is fixed to the outer wall of the rotating drum 105, and the outer shell 104 also provides a safe and stable movement space for the counterweight 113;

[0044] like Figure 7 and Figure 8As shown, the spiral pump shaft 100 is made of polymer material. Both the outer and inner walls of the spiral shaft 100 are inlaid with metal wear-resistant strips 1001 to match its spiral line. When the spiral pump shaft 100 extends and retracts in the axial direction, the two wear-resistant strips 1001 replace the spiral pump shaft 100 in friction with the rotating drum 105 and the sleeve 101. The spiral pump shaft 100 is hollow. Both ends of the spiral pump shaft 100 are connected to metal adapters 1002 through the hollow structure. Both adapters 1002 and both ends of the spiral pump shaft 100 are cut with stabilizing surfaces 1003 along the plane perpendicular to its spiral axis. The adapter seat 102 and the end of the sleeve 101 away from the adapter seat 102 are respectively attached to the stabilizing surfaces 1003 on the two adapters 1002 and fastened with screws.

[0045] In the above structural design, when the spiral pump shaft 100 is compressed in length, the space restriction and compression of the spiral pump shaft 100 by the rotating drum 105 causes one end of the spiral pump shaft 100 connected to the adapter seat 102 to deflect around the transmission shaft 103, releasing the spiral diameter that was originally to be increased in the form of increasing the spiral angle. In addition, the spiral pump shaft 100 with a circular spiral structure has higher tolerance under complex stress conditions than the traditional flat ribbon spiral blade. Therefore, this places certain requirements on the flexibility of the spiral pump shaft 100 body. The present invention solves the additional technical problems of the above solution by reducing its material rigidity and using wear-resistant strips 1001 to replace the friction of the body.

[0046] In summary, the anti-winding submersible sewage pump of this invention retains the anti-winding advantages of its prototype auger sewage pump while achieving the effect of automatically adjusting the working pitch of the screw pump shaft 100 according to the viscosity changes of the working medium. It can adaptively adjust the sewage flow rate and sewage thrust in the face of drastic changes in sewage viscosity, and can also significantly reduce the impact force on the drive motor in the face of drastic changes in sewage viscosity. It also reduces the current load changes of the drive motor controller, thereby protecting the electrical parts of the equipment and reducing the performance requirements of the electrical parts, thus reducing the electrical hardware cost of the equipment.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An anti-tangling submersible sewage pump, characterized in that, include: The spiral pump shaft (100) is a spiral cylindrical spring with a circular cross-section. It is made of a lightweight elastic material and is used to drive sewage when rotating. A sleeve (101) and an adapter (102) are provided. A drive shaft (103) is inserted between the sleeve (101) and the adapter (102). The end of the drive shaft (103) is helically slidably connected to the sleeve (101). The adapter (102) slides a limited distance away from the sleeve (101) along the drive shaft (103). One end of the sleeve (101) is fixedly inserted into the bottom of the rotating drum (105). A limit snap ring (107) is provided at the end of the drive shaft (103) located away from the sleeve (101) on the adapter (102). The spiral pump shaft (100) is wound around the sleeve (101). Both ends of the spiral pump shaft (100) are connected to the sleeve (101) and the adapter (102) respectively. The outer casing (104) and the rotating drum (105) are slidably sleeved outside the spiral pump shaft (100), forming a spiral flow channel for driving sewage with the sleeve (101) and the spiral pump shaft (100) and limiting the spiral diameter of the spiral pump shaft (100). The rotating drum (105) is sealed and rotated inside the outer casing (104) to reduce rotational resistance in sewage. The stator of the hollow shaft motor (106) is connected to the flange on the end face of the housing (104), and the drive shaft (103) slides and inserts with only one degree of freedom along the axial direction of the hollow shaft motor (106).

2. The anti-winding submersible sewage pump as described in claim 1, characterized in that: The spiral pump shaft (100) is made of polymer material. The outer wall of the spiral shaft (100) and the inner wall of the spiral shaft (100) are both inlaid with wear-resistant strips (1001) made of metal material. When the spiral pump shaft (100) extends and retracts in the axial direction, the two wear-resistant strips (1001) replace the spiral pump shaft (100) in friction with the rotating drum (105) and the sleeve (101).

3. The anti-winding submersible sewage pump as described in claim 1, characterized in that: The spiral pump shaft (100) is hollow, and both ends of the spiral pump shaft (100) are connected to metal adapters (1002) through the hollow structure. Both adapters (1002) and both ends of the spiral pump shaft (100) are cut with stabilizing surfaces (1003) along a plane perpendicular to the axis of the spiral body. The end of the adapter seat (102) and the sleeve (101) away from the adapter seat (102) respectively fits against the stabilizing surfaces (1003) on the two adapters (1002) and is fastened with screws.

4. The anti-winding submersible sewage pump as described in claim 1, characterized in that: Both the rotating cylinder (105) and the outer shell (104) are cylindrical and are inserted into each other with their openings facing each other. The bottom of the rotating cylinder (105) is provided with a fan-shaped liquid inlet groove (1051). The peripheral wall of the rotating cylinder (105) is provided with a drain groove (1052) in a ring array at the opening. The outer shell (104) is provided with a flange interface (1041) corresponding to the drain groove (1052).

5. The anti-winding submersible sewage pump as described in claim 4, characterized in that: Three sealed bearings (108) are provided between the outer shell (104) and the rotating drum (105), one on each side of the drain trough (1052) and one at the opening of the outer shell (104).

6. The anti-winding submersible sewage pump as described in claim 1, characterized in that: A shaft seal (109) is provided between the outer casing (104) and the drive shaft (103), and the position of the shaft seal (109) is fixed relative to the outer casing (104).

7. The anti-winding submersible sewage pump as described in claim 1, characterized in that: The spiral groove of the drive shaft (103) and the sleeve (101) is spiraled in the same direction as the spiral pump shaft (100).

8. The anti-winding submersible sewage pump as described in claim 1, characterized in that: A bellows cover (110) is provided between the sleeve (101) and the adapter (102). The bellows cover (110) is fitted with the rotating shaft, and one end of the bellows cover (110) is sealed to the flange of the adapter (102). A sealing ring (111) is sealed between the other end of the bellows cover (110) and the edge of the end of the sleeve (101), and the sealing ring (111) has a concave cross-section.

9. The anti-winding submersible sewage pump as described in claim 1, characterized in that: The hollow shaft motor (106) is an external rotor type, and a sealing cover (112) is sleeved between the hollow shaft motor (106) and the transmission shaft (103) that passes through its output shaft. A counterweight (113) is fixed on the outer wall of the rotating drum (105).

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