Anti-winding submersible sewage pump

Abstract

The invention relates to the field of axial flow pumps, in particular to an anti-winding submersible sewage pump which comprises a spiral pump shaft which is in a spiral cylindrical spring shape, is made of a light elastic material with a circular section and is used for driving sewage during rotation; a transmission shaft is connected between the sleeve and the adapter in an inserted mode, and the end of the transmission shaft is connected with the sleeve in a spiral sliding mode. According to the anti-winding submersible sewage pump, the anti-winding advantage of an auger sewage pump of a prototype machine is reserved, meanwhile, the effect of automatically adjusting the working screw pitch of the screw pump shaft according to the viscosity change of a working medium is achieved, and the sewage discharging flow speed and the sewage discharging thrust can be adjusted in a self-adaptive mode in the severe viscosity change of sewage; in addition, impact force borne by the driving motor in violent sewage viscosity changes can be remarkably reduced, additionally, current load changes of a driving motor controller are reduced, electrical parts of equipment are protected, the performance requirement for the electrical parts is reduced, and therefore the electrical hardware cost of the equipment is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of axial flow pumps, in particular to a anti-winding submersible sewage pump. BACKGROUND

[0002] The blade of the auger sewage pump is in the form of a spiral band, and compared with other conventional axial or centrifugal blades, it has the characteristics of low flow rate but stable pressure, which is due to its continuous spiral band-shaped blade. The auger sewage pump can stably transport fluids with large viscosity variation, and can easily cope with complex sewage mixed with particulate matter, ropes and fabrics.

[0003] At present, the submersible sewage pump with spiral blades on the market has a fixed pitch of the spiral blades, and the spiral blades are generally directly welded on the long rotating shaft. Although the fixed pitch blade has low manufacturing difficulty and easy cost control, its disadvantages are also obvious. Its adaptability to fluids with different viscosities is poor. For example, during the sewage process, the originally high-flow sewage is suddenly sucked into the sludge or other similar substances, resulting in a sharp increase in fluid viscosity, which will cause two problems. First, the sharp increase in fluid viscosity will cause the overload of the driving motor, which is a test for the motor and the motor controller. Therefore, in order to ensure safety and redundancy, a motor with higher power and torque and a controller with higher power are required, which is not conducive to the size and cost of the equipment. Second, the large pitch blade is obviously more advantageous in sewage flow rate than the small pitch blade, and the small pitch blade can provide higher thrust in the axial direction. The fixed pitch sewage thrust and sewage flow rate cannot be compatible.

[0004] In order to optimize the above problems, an anti-winding submersible sewage pump capable of automatically adjusting the working pitch according to the viscosity change of the working medium is proposed. SUMMARY

[0005] In view of the above or the problem that the fixed pitch spiral band sewage pump in the prior art has high requirements for motor power and torque redundancy when the viscosity of the working medium changes sharply, thereby increasing the cost of the equipment, and the problem that the fixed pitch spiral band sewage pump cannot be compatible with the sewage thrust and the sewage flow rate, the present application is proposed.

[0006] Therefore, the purpose of the present application is to provide an anti-winding submersible sewage pump.

[0007] To solve the above technical problems, the application provides the following technical scheme: a winding-preventing submersible sewage pump, comprising: a spiral pump shaft, which is in the shape of a spiral cylindrical spring, has a circular cross section, is made of light and elastic material, and is used to drive sewage when rotating; a sleeve and an adapter seat, a transmission shaft being inserted between the sleeve and the adapter seat, an end of the transmission shaft being in screw sliding connection with the sleeve, and the sliding distance of the adapter seat away from the sleeve along the transmission shaft being limited, the spiral pump shaft being sleeved on the sleeve, and two ends of the spiral pump shaft being connected with the sleeve and the adapter seat respectively; an outer shell and a rotating drum, the rotating drum being slidingly sleeved on the spiral pump shaft outside, the sleeve and the spiral pump shaft being used to build a spiral flow channel for driving sewage and limit the spiral diameter of the spiral pump shaft, and the rotating drum being sealingly and rotatably sleeved in the outer shell to reduce the rotating resistance in sewage; and a hollow shaft motor, a stator of the hollow shaft motor being connected with an end flange of the outer shell, and the transmission shaft being slidingly inserted along the axis direction of the hollow shaft motor with only one degree of freedom.

[0008] As a preferred scheme of the winding-preventing submersible sewage pump, the spiral pump shaft is made of high polymer material, the outer wall and the inner wall of the spiral body of the spiral pump shaft are inlaid with wear-resistant strips made of metal material along the spiral line, and the two wear-resistant strips are used to replace the spiral pump shaft to rub against the rotating drum and the sleeve when the spiral pump shaft is stretched and contracted along the axial direction.

[0009] As a preferred scheme of the winding-preventing submersible sewage pump, the spiral pump shaft is hollow, metal material adapter heads are inserted into the two ends of the spiral pump shaft through the hollow structure, the two adapter heads and the two ends of the spiral pump shaft are all cut into stabilizing surfaces along the plane perpendicular to the axial direction of the spiral body, and the adapter seat and the end of the sleeve away from the adapter seat are respectively attached to the stabilizing surfaces of the two adapter heads and fastened by screws.

[0010] As a preferred scheme of the winding-preventing submersible sewage pump, one end of the sleeve is fixedly inserted into the bottom of the rotating drum, and a limit snap spring is arranged at the end of the adapter seat away from the sleeve.

[0011] As a preferred scheme of the winding-preventing submersible sewage pump, the rotating drum and the outer shell are both in the shape of a cylinder and are inserted into each other, the bottom of the rotating drum is provided with a fan-shaped liquid inlet groove, the peripheral wall of the rotating drum is provided with a plurality of liquid outlet grooves in the form of an annular array at the opening, and the outer shell is provided with a flange interface corresponding to the liquid outlet grooves.

[0012] As a preferred scheme of the winding-preventing submersible sewage pump, three sealing bearings are arranged between the outer shell and the rotating drum, one on each side of the liquid outlet grooves and one at the opening of the outer shell.

[0013] As a preferred scheme of the anti-winding submersible sewage pump, the shaft seal is arranged between the shell and the transmission shaft, and the shaft seal is fixed relative to the shell.

[0014] As a preferred scheme of the anti-winding submersible sewage pump, the helical groove of the screw joint between the transmission shaft and the sleeve pipe has the same rotation direction as the helical pump shaft.

[0015] As a preferred scheme of the anti-winding submersible sewage pump, the sleeve pipe and the adapter seat are provided with an organ case, the organ case is sleeved with the rotating shaft, one end of the organ case is sealingly connected with the flange of the adapter seat, and the other end of the organ case is sealingly sleeved with a sealing ring between the end edge of the sleeve pipe, and the cross section of the sealing ring is in the shape of a concave letter.

[0016] As a preferred scheme of the anti-winding submersible sewage pump, the hollow shaft motor is an external rotor type, a sealing cover is sleeved between the hollow shaft motor and the transmission shaft penetrating through the output shaft of the hollow shaft motor, and the outer wall of the rotating cylinder is fixed with a counterweight.

[0017] The anti-winding submersible sewage pump has the following advantages: 1. The anti-winding submersible sewage pump retains the anti-winding advantages of the original auger sewage pump, and can automatically adjust the working pitch of the helical pump shaft according to the viscosity change of the working medium, so as to adaptively adjust the sewage flow rate and sewage thrust in the case of severe sewage viscosity change. 2. The anti-winding submersible sewage pump can also significantly reduce the impact force on the driving motor in the case of severe sewage viscosity change, and also reduces the current load change of the driving motor controller, thereby protecting the electrical part of the equipment, reducing the performance requirement of the electrical part, and reducing the electrical hardware cost of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 The structure of the anti-winding submersible sewage pump is shown in the figure.

[0020] Figure 2 The structure of the anti-winding submersible sewage pump is shown in the figure. Figure 1 The structure of the anti-winding submersible sewage pump is shown in the figure.

[0021] Figure 3The schematic diagram of the position distribution of the sealing bearing between the shell and the rotating drum.

[0022] Figure 4 The sectional view of the assembly structure of the screw pump shaft.

[0023] Figure 5 The schematic diagram of the structure of the screw pump shaft.

[0024] Figure 6 The sectional view of the assembly structure of the sleeve, the adapter and the transmission shaft.

[0025] Figure 7 The partial structure exploded view of Figure 6 .

[0026] Figure 8 The exploded view of the screw pump shaft.

[0027] Figure 9 The enlarged view of the structure at A in Figure 8 .

[0028] In the figure: 100, screw pump shaft; 1001, wear-resistant strip; 1002, adapter; 1003, stabilizing surface; 101, sleeve; 102, adapter; 103, transmission shaft; 104, shell; 1041, flange interface; 105, rotating drum; 1051, liquid inlet groove; 1052, liquid outlet groove; 106, hollow shaft motor; 107, limit snap spring; 108, sealing bearing; 109, shaft seal; 110, organ case; 111, sealing ring; 112, sealing cover; 113, counterweight. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0030] Embodiment, refer to Figures 1-9 , the embodiment provides an anti-winding submersible sewage pump, which can realize the effect that the working pitch can be automatically adjusted according to the viscosity change of a working medium, such as Figure 4 , which comprises a screw pump shaft 100, which is in the shape of a helical cylindrical spring, the cross section is circular, is made of light and elastic material, and is used for driving sewage when rotating; as Figure 6 , the sleeve 101 and the adapter 102, the transmission shaft 103 is inserted between the sleeve 101 and the adapter 102, the end of the transmission shaft 103 is in screw sliding connection with the sleeve 101, and the adapter 102 is limited in sliding distance along the transmission shaft 103 away from the sleeve 101, as Figure 5 , the screw pump shaft 100 is wound around the sleeve 101, and the two ends of the screw pump shaft 100 are connected with the sleeve 101 and the adapter 102 respectively; as Figure 4The shown housing 104 and the rotating drum 105, the rotating drum 105 is slidingly sleeved on the outer side of the screw pump shaft 100, and the sleeve pipe 101 and the screw pump shaft 100 build a screw flow channel for driving sewage and limit the screw diameter of the screw pump shaft 100, as shown in Figure 3 The rotating drum 105 is sealingly sleeved in the housing 104 to reduce the rotating resistance in the sewage, as shown in Figure 2 The shown hollow shaft motor 106, the stator is connected with the end flange of the housing 104, and the transmission shaft 103 is slidingly inserted along the axis direction of the hollow shaft motor 106 with only one degree of freedom; The specific structure is: Referring to Figure 4 , the rotating drum 105 and the housing 104 are both cylindrical and are inserted with opposite openings, the bottom of the rotating drum 105 is provided with a fan-shaped liquid inlet groove 1051, and the peripheral wall of the rotating drum 105 is provided with a ring array of liquid outlet grooves 1052 at the opening, and the housing 104 is provided with a flange interface 1041 corresponding to the liquid outlet grooves 1052, referring to Figure 2 And Figure 3 Three sealing bearings 108 are arranged between the housing 104 and the rotating drum 105, one on each side of the liquid outlet grooves 1052, and one at the opening of the housing 104.

[0031] Referring to Figure 6 And Figure 7 The shaft seal 109 is arranged between the housing 104 and the transmission shaft 103, and the position of the shaft seal 109 is fixed relative to the housing 104, and the transmission shaft 103 is spirally connected with the sleeve pipe 101 in the same direction as the screw pump shaft 100; one end of the sleeve pipe 101 is fixedly inserted with the bottom of the rotating drum 105, and the transmission shaft 103 is provided with a limit snap spring 107 at the end away from the sleeve pipe 101; Referring to Figure 6 The sleeve pipe 101 and the adapter seat 102 are provided with an accordion cover 110, the accordion cover 110 is sleeved with the rotating shaft, and one end of the accordion cover 110 is sealingly connected with the flange of the adapter seat 102, and the other end of the accordion cover 110 is sealingly sleeved with a sealing ring 111 between the end edge of the sleeve pipe 101, and the cross section of the sealing ring 111 is concave, the hollow shaft motor 106 is an outer rotor type, and the hollow shaft motor 106 and the transmission shaft 103 penetrating the output shaft thereof are sleeved with a sealing cover 112 for preventing the sewage from contacting the transmission shaft 103.

[0032] The application improves the conventional auger sewage pump to obtain a anti-winding submersible sewage pump, wherein a function of self-adaptive adjustment of the pitch of the screw pump shaft 100 according to the viscosity change of fluid is provided, so that when the viscosity of fluid increases, the pitch of the screw pump shaft 100 is compressed and reduced by a small amount through the slight increase of the load of the hollow shaft motor 106, so that the device sacrifices the sewage flow rate to obtain higher thrust to discharge the high viscosity part, and vice versa, when the viscosity of fluid decreases and the fluidity is higher, the force between the hollow shaft motor 106 and the screw pump shaft 100 decreases, the pitch of the screw pump shaft 100 increases to improve the sewage flow rate.

[0033] The specific working process is as follows: Figure 4 With the shell 104 as the reference system, the relative position of the hollow shaft motor 106 is fixed, the hollow shaft motor 106 drives the transmission shaft 103 to rotate, and with the transmission shaft 103 as the reference system, the hollow shaft motor 106 is fixed in position, the transmission shaft 103 is connected with the hollow shaft motor 106 through the hollow shaft motor 106, the hollow shaft motor 106 drives the transmission shaft 103 to rotate, and the transmission shaft 103 is connected with the sleeve 101 through the sleeve 101, the sleeve 101 drives the screw pump shaft 100 to rotate, and the screw pump shaft 100 is connected with the sleeve 101 through the sleeve 101. Figure 6 When the transmission shaft 103 rotates, the transmission shaft 103 has a tendency to be screwed into the sleeve 101 through the screw sliding plug-in structure between the transmission shaft 103 and the sleeve 101, but at the same time, the limiting clamp spring 107 is in contact with the side of the adapter seat 102 away from the screw pump shaft 100 and is supported by the elastic support of the screw pump shaft 100, so that the transmission shaft 103 is hindered from being screwed into the sleeve 101, and therefore the torque can be transmitted, and the transmission shaft 103 drives the sleeve 101, the screw pump shaft 100, the adapter seat 102 and the rotating drum 105 to rotate together. The rotating force between the above-mentioned transmission members and the elastic force of the screw pump shaft 100 reach a balanced state, and the viscosity change of fluid breaks this force balance. When the device suddenly sucks sludge or excrement and the like viscous matter, the resistance of the screw pump shaft 100 to push the sewage will significantly increase, which inhibits the rotation of the screw pump shaft 100, and relatively the rotation of the screw pump shaft 100 is decelerated, while the output speed of the hollow shaft motor 106 is relatively unchanged, so that the force between the hollow shaft motor 106 and the screw pump shaft 100 increases, the screw groove between the transmission shaft 103 and the sleeve 101 converts the increased torque into a strong thrust in the axial direction, forcing the limiting clamp spring 107 to push the adapter seat 102 to compress the screw pump shaft 100, so that the pitch of the screw pump shaft 100 is reduced, so that at the same speed, the sewage flow rate is sacrificed to obtain higher thrust of the screw pump shaft 100, and the high viscosity sewage is discharged.

[0034] The application also relates to the following technical details for realizing the above-mentioned target function: metal spiral belts are usually used as rotating members in the auger sewage pump, but when the pitch of the spiral blades is simply adjusted by lengthening or compressing, the diameter of the spiral body will also change, the diameter will increase when the pitch is compressed and reduced, and vice versa, so that the spiral blades will extrude the shell 104 or the gap will increase, the former will cause operation blockage or jamming, and the latter will seriously reduce the working efficiency of the equipment, so that the assembly problem of the spiral blades needs to be solved during the realization of the pitch adjustment of the spiral blades of the sewage pump. The technical problem is that the helical blade rotates at high speed relative to the shell, which causes the helical blade to be blocked or stuck when it contacts the inner wall of the shell. The helical pump shaft 100 is allowed to be pressed against the inner wall of the rotating drum 105, so the helical diameter of the helical pump shaft 100 at the maximum working pitch is used as the inner diameter of the rotating drum 105. When the helical pump shaft 100 adjusts its working pitch, the outer side of the helical pump shaft 100 always contacts the inner wall of the rotating drum 105. Since the wire diameter of the helical pump shaft 100 does not change, the inner side of the helical pump shaft 100 can also always contact the sleeve 101. This makes the helical flow passage formed by the helical pump shaft 100, the rotating drum 105, and the sleeve always effective. This design directly eliminates the need for complex and conventional sealing forms. The shell 104 is responsible for carrying the above structure, connecting the pipeline to discharge sewage, and avoiding direct exposure of the rotating drum 105 to sewage. Since some sewage has relatively high viscosity (such as a septic tank), direct contact with the outer wall of the rotating drum 105 can severely hinder the rotation of the rotating drum 105, thereby increasing energy consumption. In addition, referring to Figure 3 , the rotating drum 105 has a counterweight 113 fixed to its outer wall, and the shell 104 provides a safe and stable movement space for the counterweight 113. As shown in Figure 7 and Figure 8 , the helical pump shaft 100 is made of a high-molecular material. The outer wall and inner wall of the helical body of the helical pump shaft 100 are matched with metal wear-resistant strips 1001 embedded in the helical line. When the helical pump shaft 100 stretches or contracts in the axial direction, the two wear-resistant strips 1001 replace the friction between the helical pump shaft 100 and the rotating drum 105 and the sleeve 101. The helical pump shaft 100 is hollow, and both ends of the helical pump shaft 100 are inserted with metal adapters 1002 through the hollow structure. The two adapters 1002 and the two ends of the helical pump shaft 100 are cut along the plane perpendicular to the helical body axis to form stabilizing surfaces 1003. 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 are fastened with screws. In the above structural design, when the screw pump shaft 100 is compressed in length, the space limitation and extrusion of the rotating drum 105 on the screw pump shaft 100 causes the end of the screw pump shaft 100 connected to the adapter seat 102 to deflect around the transmission shaft 103, and the originally increased screw diameter is released in the form of increasing the screw angle. In addition, the screw pump shaft 100 with a circular screw structure has higher resistance performance under complex stress conditions than the traditional flat belt-shaped screw blades, so a certain requirement is put forward to the flexibility of the body of the screw pump shaft 100. The present application solves the above-mentioned technical problems by reducing the material rigidity and using wear-resistant strips 1001 to replace the body friction.

[0035] In summary, the anti-winding submersible sewage pump of the present application retains the anti-winding advantages of the original prototype auger sewage pump, and realizes the effect of automatically adjusting the working pitch of the screw pump shaft 100 according to the viscosity change of the working medium. It can adaptively adjust the sewage flow rate and sewage thrust in the case of severe sewage viscosity change, and can significantly reduce the impact force on the driving motor in the case of severe sewage viscosity change. The current load change of the driving motor controller is also reduced, thereby protecting the electrical part of the equipment and reducing the performance requirements of the electrical part, thereby reducing the electrical hardware cost of the equipment.

[0036] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. An anti-entanglement submersible sewage pump, characterized in that: include: The screw pump shaft (100) is in the shape of a spiral cylindrical spring with a circular cross section and is made of a lightweight elastic material and is used to drive sewage when rotating; A sleeve (101) and an adapter seat (102), a transmission shaft (103) is inserted between the sleeve (101) and the adapter seat (102), an end of the transmission shaft (103) is spirally slidably connected to the sleeve (101), and a sliding distance of the adapter seat (102) along the transmission shaft (103) in a direction away from the sleeve (101) is limited, the spiral pump shaft (100) is wound around the sleeve (101), and the two ends of the spiral pump shaft (100) are respectively connected to the sleeve (101) and the adapter seat (102); A housing (104) and a rotating drum (105), wherein the rotating drum (105) is slidably sleeved on the outside of the spiral pump shaft (100), and together with the sleeve (101) and the spiral pump shaft (100), a spiral flow channel for driving sewage is constructed and the spiral diameter of the spiral pump shaft (100) is limited. The rotating drum (105) is sealed and rotatably sleeved in the housing (104) to reduce rotational resistance in the sewage; The stator of the hollow shaft motor (106) is connected to the end face flange of the housing (104), and the transmission shaft (103) is slidably plugged in with only one degree of freedom along the axial direction of the hollow shaft motor (106).

2. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: The spiral pump shaft (100) is made of polymer material. The outer wall and the inner wall of the spiral pump shaft (100) are both matched with the spiral line and inlaid with metal wear-resistant strips (1001). When the spiral pump shaft (100) expands and contracts in the axial direction, the two wear-resistant strips (1001) replace the friction between the spiral pump shaft (100) and the drum (105) and the sleeve (101).

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

4. The anti-entanglement submersible sewage pump according to claim 3, characterized in that: One end of the sleeve (101) is fixedly plugged into the bottom of the rotating drum (105), and a limiting retaining spring (107) is provided at one end of the transmission shaft (103) located at the adapter seat (102) away from the sleeve (101).

5. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: The rotating drum (105) and the outer shell (104) are both cylindrical and plugged in with their openings facing each other. A fan-shaped liquid inlet groove (1051) is provided at the bottom of the rotating drum (105). Liquid drainage grooves (1052) are provided in a circular array on the peripheral wall of the rotating drum (105) at the opening. A flange interface (1041) is provided on the outer shell (104) at a position corresponding to the liquid drainage groove (1052).

6. The anti-entanglement submersible sewage pump according to claim 5, characterized in that: Three sealed bearings (108) are provided between the housing (104) and the rotating drum (105), one on each side of the drainage groove (1052) and one at the opening of the housing (104).

7. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: A shaft seal (109) is provided between the housing (104) and the transmission shaft (103), and the position of the shaft seal (109) is fixed relative to the housing (104).

8. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: The rotation direction of the spiral groove of the spiral connection between the transmission shaft (103) and the sleeve (101) is the same as the rotation direction of the spiral pump shaft (100).

9. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: An accordion cover (110) is provided between the sleeve (101) and the adapter seat (102), the accordion cover (110) is sleeved on the rotating shaft, and one end of the accordion cover (110) is sealedly connected to the flange of the adapter seat (102), and a sealing ring (111) is sealedly sleeved between the other end of the accordion cover (110) and the edge of the end of the sleeve (101), and the cross-section of the sealing ring (111) is concave.

10. The anti-entanglement submersible sewage pump according to claim 1, characterized in that: The hollow shaft motor (106) is of an outer rotor type, and a sealing cover (112) is sleeved between the hollow shaft motor (106) and the transmission shaft (103) extending through the output shaft thereof, and a counterweight (113) is fixed to the outer wall of the rotating drum (105).

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