Washing machine drainage pump capable of increasing flow and saving electric energy and washing machine

Abstract

The washing machine drainage pump comprises a pump body, a motor and a sealing ring, the sealing ring is arranged at the joint of the pump body and the motor, and water in a drum of the washing machine sequentially passes through a water inlet pipe, a water inlet cavity, a water passing hole and a water suction hole; the water drainage direction is restrained and induced by the upper water baffle and the lower water baffle which are in a conical surface ring shape, water flows through the outer blades and radiates towards the inner hole of the water drainage pipe and the edge of the inner hole along the first conical surface of the upper water baffle and the second conical surface of the lower water baffle, and the flow loss of water drainage towards other directions is reduced; the drainage direction is precisely restrained and induced, the drainage flow radiates towards the inner hole and the edge of the inner hole of the drainage pipe in the wrap angle range formed by the first conical surface of the upper water baffle and the second conical surface of the lower water baffle of the outer blade, the drainage flow of the drainage pipe is increased, and under the condition of the same lift and drainage flow requirement, the drainage efficiency of the drainage pipe is improved. And electric energy can be saved on the aspect of the power of the drainage pump.

Description

Technical Field

[0001] The present invention relates to the technical field of washing machines, and particularly to a washing machine drain pump and a washing machine that improve flow rate and save electric energy. Background Art

[0002] For the washing machine drain pumps on the current market, since the impeller does not reasonably constrain the drainage direction in terms of structure, the drainage water flow splashes around the drainage cavity. In particular, the turbulence formed by the jet of the impeller's drainage direction towards the inlet cavity repels the fluid sucked by the impeller from the inlet cavity, resulting in a slower or blocked speed of the water flow flowing from the inlet cavity into the drainage cavity. Eventually, part of the flow rate is lost and the drainage efficiency is low. Drainage pumps with this structure often increase the effective drainage area of the impeller blades or increase the number of blades to make up for the flow rate loss, which increases the power of the motor and wastes electric energy.

[0003] An efficient and low-noise washing machine drain pump with the patent publication number CN107100854A includes a pump body, a filter, an inlet port ring, a radial impeller, a printed shaft, and a synchronous motor. The printed shaft passed through by the radial impeller is driven by the synchronous motor and can rotate forward or backward according to the motor rotation direction. The impeller includes long blades, short blades, and back blades. The back blades of the radial impeller are mainly used to balance the axial force. By adding short blades to the flow between the long blades of the impeller, the axial vortex in the flow channel can be weakened. The short blades are arranged in the middle position of the flow channel and are used to weaken the axial vortex in the flow channel, thereby reducing the diffusion loss and secondary flow loss in the flow channel, weakening the adverse flow in the flow channel, and thus improving the hydraulic efficiency of the drain pump and reducing energy consumption. For the washing machine drain pump with this structure, in practical applications, the energy consumption is reduced, but the improvement in flow rate is not obvious.

[0004] A drain pump with an impeller having a small hub ratio with the patent publication number CN109595179A includes an impeller and a driving part for driving the impeller to rotate. The impeller is an impeller with a small hub ratio. The drain pump further includes a housing. The driving part includes a stator assembly fixed on the housing, and the driving part further includes a rotor assembly that cooperates with the stator assembly. The rim of the impeller with a small hub ratio is fixedly connected to the inner wall of the rotor assembly and rotates with the rotor assembly. The middle part of the impeller with a small hub ratio is hollow. Although this drain pump slightly improves the flow capacity of the impeller to a certain extent and improves the hydraulic efficiency, it still cannot effectively control the drainage direction and is not satisfactory in terms of improving the flow rate.

[0005] The drainage impeller, the drainage pump set and the washing machine with the same having a patent publication number of CN107165855A. The drainage impeller includes a disk, at least part of the disk is formed as a guiding section, and in the direction away from the bottom surface of the disk, the cross-sectional area of the guiding section gradually decreases. There are a plurality of blades, the shapes of the plurality of blades are the same and they are circumferentially arranged on the disk. The front end of the blade is adjacent to the center of the disk, and the tail end of the blade is adjacent to the edge of the disk. In the direction from the front end to the tail end of the blade, the blade bends in the rotation direction of the drainage impeller. The lower edge of the blade is fixed to the guiding section, and there is an offset between the upper edge and the lower edge of the blade, and the direction of the offset is the same as the bending direction of the blade. Although this drainage pump can improve the drainage flow rate of the drainage impeller to a certain extent, it still cannot effectively control the drainage direction, resulting in loss of part of the drainage flow rate. Summary of the Invention

[0006] In view of the above problems existing in the prior art, the present invention provides a washing machine drainage pump that can improve the flow rate and save electric energy, so as to achieve the purpose of improving the flow rate and saving electric energy.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A washing machine drainage pump that can improve the flow rate and save electric energy, comprising: a pump body, a motor and a sealing ring.

[0008] The pump body includes a cover, an inlet chamber, an inlet pipe, a drainage chamber, a drainage pipe and a water passing hole. The inlet pipe is arranged on the side wall of the inlet chamber and is communicated with the inlet chamber. The drainage pipe is arranged on the side wall of the drainage chamber and is communicated with the drainage chamber. The water passing hole is arranged between the inlet chamber and the drainage chamber. The inlet chamber and the drainage chamber are coaxially arranged. The ratio of the diameter of the inlet chamber to the diameter D3 of the drainage chamber is between 0.7 and 0.9, so that different water level depths are formed in the radial direction between the inlet chamber and the drainage chamber, so as to increase the flow velocity of the inner peripheral wall of the drainage chamber to increase the amount of water flowing into the inlet of the drainage pipe per unit time, and improve the drainage flow rate; The motor includes a stator, a rotor, and an impeller. The rotor is placed in the accommodation cavity of the stator. The rotor has a shaft. The impeller has a sleeve, a central hole, inner blades, outer blades, an upper water baffle, a lower water baffle, and a water suction hole. One end of the shaft extends into the central hole. The rotor drives the impeller to rotate forward or backward. The inner blades extend radially from the outer side wall of the sleeve to the water suction hole. The outer blades are arranged between the upper water baffle and the lower water baffle and connect the upper water baffle and the lower water baffle. The upper water baffle and the lower water baffle are in a conical ring shape. The ratio of the outer circle diameter D1 of the water suction hole to the diameter D2 of the conical ring edge of the lower water baffle is between 0.6 and 0.8. Within this ratio range, it not only ensures the suction speed of the water flow generated by the water suction hole but also ensures the guiding length of the second conical surface of the lower water baffle for the water flow. If the outer circle diameter D1 of the water suction hole is too large, the guiding length of the second conical surface of the lower water baffle for the water flow will become shorter, affecting the guiding of the drainage direction of the water flow. On the contrary, the longer the guiding length of the second conical surface of the lower water baffle for the water flow, the smaller the outer circle diameter D1 of the water suction hole will be, affecting the suction of the water flow by the water suction hole. A reasonable ratio range is required to ensure a balance between the two; Wherein, the impeller is placed in the drainage cavity, and the center line of the drainage cavity coincides with the center line of the shaft. The ratio of the diameter D2 of the conical ring edge of the lower water baffle to the diameter D3 of the drainage cavity is between 0.6 and 0.8. Within this ratio range, the drainage distance from the conical ring edge of the lower water baffle to the inner hole and the inner hole edge of the drain pipe is reasonably selected to improve the drainage capacity of the outer blades; Wherein, in the plane passing through the center line of the drain pipe and the center line of the shaft, for ease of understanding, the following all refer to this plane. The center line of the drain pipe is perpendicular to the center line of the shaft. The drain pipe and the drainage cavity form a first intersection line at the internal intersection in the drainage cavity. The outer blades are straight blades, and the outer blades form a wrap angle α along the first conical surface of the upper water baffle and along the second conical surface of the lower water baffle towards the inner hole of the drain pipe and the two first edge endpoints of the first intersection line. The drainage direction of the outer blades radiates towards the inner hole of the drain pipe and the inner hole edge within the range of the wrap angle α. The connection line of the two first edge endpoints is perpendicular to the center line of the drain pipe. The generatrix of the first conical surface of the upper water baffle and the generatrix of the second conical surface of the lower water baffle are symmetrically distributed about the center line of the drain pipe. The wrap angle α is related to the radius r of the drain pipe and the radius R of the drainage cavity, and satisfies the relationship: α = 2β = 2arctan , where β is the angle between the center line of the drain pipe and the generatrix of the first conical surface of the upper water baffle or the generatrix of the second conical surface of the lower water baffle. Considering the size of the space required for the drainage pump to be accommodated in the washing machine and the drainage flow rate required by the washing machine, the value range of β is selected to be between 15° and 20°, and the value range of the radius R of the drainage cavity is between 23 and 27 millimeters. The above relationship can more accurately control and restrict the drainage direction of the outer blade to radiate along the range of the wrap angle α towards the inner hole and the edge of the inner hole of the drain pipe, so as to prevent the flow rate loss caused by the deviation of the drainage direction; The sealing ring is arranged at the joint of the pump body and the motor to prevent the pressure leakage of the drainage cavity, ensure the formation of negative pressure in the water absorption hole and the water flow velocity, and provide conditions for improving the drainage flow rate.

[0009] The present invention also adopts the following another technical solution: A washing machine drainage pump for improving flow rate and saving electric energy, comprising: A pump body, the pump body includes a cover, a water inlet cavity, a water inlet pipe, a drainage cavity, a drain pipe and a water passing hole. The water inlet pipe is arranged on the side wall of the water inlet cavity and is communicated with the water inlet cavity. The drain pipe is arranged on the side wall of the drainage cavity and is communicated with the drainage cavity. The water passing hole is arranged between the water inlet cavity and the drainage cavity. The drainage cavity also has a recessed part, the recessed part is close to the position where the drain pipe is communicated with the drainage cavity, the inner wall surface radius R1 of the recessed part is larger than the inner wall surface radius R of other parts of the drainage cavity, and the inner wall surface radius R1 of the recessed part is concentrically arranged with the inner wall surface radius R of other parts of the drainage cavity; A motor, the motor includes a stator, a rotor and an impeller. The rotor is placed in the accommodation cavity of the stator. The rotor has a shaft. The impeller has a sleeve, a central hole, inner blades, outer blades, an upper water baffle, a lower water baffle and a water suction hole. One end of the shaft extends into the central hole. The rotor drives the impeller to rotate forward or backward. The inner blades extend radially from the outer side wall of the sleeve to the water suction hole. The outer blades are arranged between the upper water baffle and the lower water baffle and connect the upper water baffle and the lower water baffle. The upper water baffle and the lower water baffle are in a conical ring shape. The ratio of the outer circle diameter D1 of the water suction hole to the diameter D2 of the conical ring edge of the lower water baffle is between 0.6 and 0.8. Within this ratio range, both the negative pressure generated by the water suction hole for the water suction speed and the guiding length of the second conical surface of the lower water baffle for the water flow are ensured. If the outer circle diameter D1 of the water suction hole is too large, the guiding length of the second conical surface of the lower water baffle for the water flow will become shorter, affecting the guiding of the water drainage direction. On the contrary, the longer the guiding length of the second conical surface of the lower water baffle for the water flow, the smaller the outer circle diameter D1 of the water suction hole will be, affecting the water suction of the water suction hole. A reasonable ratio range is to ensure a balance between the two; Wherein, the impeller is placed in the drainage cavity, and the center line of the drainage cavity coincides with the center line of the shaft; Wherein, in the plane passing through the center line of the drain pipe and the center line of the shaft, the center line of the drain pipe is perpendicular to the center line of the shaft. The drain pipe and the inner wall surface of the recess form a second intersection line inside the drainage cavity. The outer blades are straight blades, and the outer blades form a wrap angle α along the first conical surface of the upper water baffle and along the second conical surface of the lower water baffle towards the inner hole of the drain pipe and the two second edge endpoints of the second intersection line. The drainage direction of the outer blades radiates towards the inner hole of the drain pipe and the inner hole edge along the range of the wrap angle α. The connection line of the two second edge endpoints is perpendicular to the center line of the drain pipe. The generatrix of the first conical surface of the upper water baffle and the generatrix of the second conical surface of the lower water baffle are symmetrically distributed about the center line of the drain pipe. The wrap angle α is associated with the radius r of the drain pipe and the ratio K of the inner wall surface radius R1 of the recess to the radius R of other parts of the drainage cavity, and satisfies the relational expression: α = 2β = 2arctan = 2arctan , where β is the angle between the center line of the drain pipe and the generatrix of the first conical surface of the upper water baffle or the generatrix of the second conical surface of the lower water baffle. Considering the size of the space required for the drainage pump to be accommodated in the washing machine and the drainage flow rate required by the washing machine, the value range of β is selected to be between 15° and 20°. K is the ratio of the inner wall radius R1 of the recessed part to the radius R of other parts of the drainage cavity, R1 = KR, the value range of K is between 1.05 and 1.2, and the value range of R is between 23 and 27 millimeters; The sealing ring is arranged at the joint of the pump body and the motor to prevent the pressure leakage of the drainage cavity, ensure the formation of negative pressure in the water suction hole and the water flow velocity, and provide conditions for increasing the drainage flow rate.

[0010] The rotor drives the impeller to rotate forward or backward. The water flow sequentially passes through the water inlet pipe, the water inlet cavity, and the water passing hole. The negative pressure generated by the rotation of the inner blades forms suction force to suck the water flow into the water suction hole. The upper water baffle and the lower water baffle in the shape of a conical ring restrict and induce the drainage direction. The water flow radiates along the first conical surface of the upper water baffle and the second conical surface of the lower water baffle of the outer blades towards the inner hole and the edge of the inner hole of the drain pipe, reducing the flow loss in other drainage directions. In particular, it greatly reduces the turbulent flow formed by the jet of the drainage direction of the impeller towards the water inlet cavity and the repulsive force between the fluid sucked by the impeller from the water inlet cavity, which causes the water flow to slow down or be blocked when flowing from the water inlet cavity into the drainage cavity, resulting in partial flow loss. Therefore, by restricting and inducing the drainage direction, the drainage flow rate radiates towards the inner hole and the edge of the inner hole of the drain pipe within the included angle range formed by the first conical surface of the upper water baffle and the second conical surface of the lower water baffle of the outer blades to increase the drainage flow rate of the drain pipe.

[0011] Preferably, the outer side of the sleeve has a sleeve, and the sleeve is coaxially arranged with the sleeve. The arrangement of the sleeve can balance the stability of the impeller rotation. The ratio of the outer diameter D4 of the sleeve to the diameter D6 of the conical ring edge of the upper water baffle is between 0.4 and 0.6, and the diameter D6 of the conical ring edge of the upper water baffle is equal to the diameter D2 of the conical ring edge of the lower water baffle. A reasonable setting of this ratio can reduce the flow loss on the negative pressure side of the upper water baffle. At the same time, the diameter D6 of the conical ring edge of the upper water baffle is equal to the diameter D2 of the conical ring edge of the second conical surface of the lower water baffle, which is beneficial to the dynamic balance of the conical ring rotation on both sides of the outer blade. At the same time, the outer blades radiate drainage evenly along the boundary of the included angle towards the edge of the drain pipe inlet to increase the drainage flow rate. The inner blades are connected to the top of the sleeve in the axial direction to enhance the strength of the inner blades.

[0012] Preferably, the outer side of the sleeve is provided with balance holes, the diameter D5 of the balance holes is not greater than the outer diameter D1 of the water absorption holes, to prevent too much water flow from passing through the balance holes, and the ratio of the outer diameter D4 of the sleeve to the diameter D5 of the balance holes is between 0.6 and 0.8, to limit the size of the balance holes. A reasonable ratio range can balance the stability of the impeller rotation and reduce the flow loss on the negative pressure side of the upper water baffle.

[0013] Preferably, the cross-sectional area of the inner blades gradually increases from the outer side wall of the sleeve towards the outer circle of the water absorption holes, and the cross-sectional area of the outer blades gradually increases from the outer circle of the water absorption holes towards the outer edge of the outer blades, which can reduce the pulsation caused by the relative water flow pressure of the inner blades and the outer blades. And while reasonably configuring the suction force generated by the inner blades, it is also beneficial to restrict the drainage direction of the outer blades to increase the drainage flow rate of the outer blades.

[0014] Preferably, the water absorption holes and the water passing holes are coaxially arranged, and the ratio of the outer diameter D1 of the water absorption holes to the diameter of the water passing holes is between 0.8 and 1. Within this ratio range, the uniformity of the negative pressure distribution of the inner blades in the water absorption holes and the speed of the water flow sucked into the water absorption holes can be improved.

[0015] Preferably, the number of blades of the inner blades and the outer blades is set between 4 and 6, and the number of the inner blades does not exceed the number of the outer blades. The blades of the inner blades and the outer blades are evenly distributed. On the premise of ensuring that the inner blades form sufficient suction force, the outer blades can meet the drainage flow rate with the least work.

[0016] Preferably, the inner blades are straight blades, the cross-sections of the inner blades and the outer blades in the radial direction are in the same plane, and the inner blades and the outer blades are connected, which is convenient for improving the overall strength and service life of the impeller.

[0017] Preferably, the motor is a single-phase AC permanent magnet synchronous motor or a three-phase permanent magnet synchronous motor. The impeller is made of engineering plastics, and the pump body is made of a combination of engineering plastics and rubber, which is convenient for simplifying the process, reducing costs and improving production efficiency.

[0018] The present invention also relates to a washing machine, which includes a washing machine drain pump for increasing the flow rate and saving electric energy as described above.

[0019] The above structure of the present invention can achieve the following beneficial effects: The ratio of the outer circle diameter D1 of the water absorption hole to the diameter D2 of the conical annular edge of the lower water baffle is between 0.6 and 0.8. Within this ratio range, both the negative pressure generated by the water absorption hole for the suction speed of the water flow and the guiding length of the second conical surface of the lower water baffle for the water flow are ensured. If the outer circle diameter D1 of the water absorption hole is too large, the guiding length of the second conical surface of the lower water baffle for the water flow will become shorter, affecting the guiding of the water flow drainage direction. Conversely, the longer the guiding length of the second conical surface of the lower water baffle for the water flow, the smaller the outer circle diameter D1 of the water absorption hole, affecting the suction of the water flow by the water absorption hole. A reasonable ratio range is to ensure a balance between the two to improve the drainage flow rate; In particular, the present invention constrains and induces the drainage direction through the upper water baffle and the lower water baffle in the shape of a conical ring. The water flow radiates along the first conical surface of the upper water baffle and the second conical surface of the lower water baffle through the outer blades towards the inner hole and the inner hole edge of the drain pipe, reducing the flow loss of drainage in other directions. Especially, to a great extent, it reduces the turbulence formed by the jet of the drainage direction of the impeller towards the inlet cavity and the repulsion of the fluid sucked by the impeller from the inlet cavity, resulting in a slowdown or obstruction of the water flow from the inlet cavity to the drainage cavity, causing partial flow loss. Through the constraint and induction of the drainage direction, the drainage flow rate radiates towards the inner hole and the inner hole edge of the drain pipe within the included angle range formed by the first conical surface of the upper water baffle and the second conical surface of the lower water baffle of the outer blades, to a greater extent to improve the drainage flow rate of the drain pipe; Since the present invention improves the drainage flow rate of the drain pipe, compared with the prior art, under the conditions of the same head and drainage flow rate requirements, the present invention can save electric energy in the power of the drainage pump. Brief Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the external structure of a washing machine drainage pump for improving the flow rate and saving electric energy according to the present invention; Figure 2 is Figure 1 the cross-sectional view in the A-A direction in Figure 3 It is a schematic diagram of the structure for improving the flow rate according to the present invention; Figure 4 It is a schematic diagram showing the association of the included angle α with the radius r of the drain pipe and the radius R of the drainage cavity in Embodiment 1 of the present invention; Figure 5 It is a three-dimensional structure diagram of the impeller according to the present invention; Figure 6 It is a front view structure diagram of the impeller according to the present invention; Figure 7 is Figure 6 the cross-sectional view in the B-B direction in Figure 8 is Figure 6 the cross-sectional view in the C-C direction in Figure 9 Schematic diagram of the pump body structure of the second embodiment in the present invention; Figure 10 is Figure 9 a cross-sectional view taken along the D-D direction in; Figure 11 Schematic diagram showing the association of the wrap angle α with the ratio K of the radius r of the drain pipe, the inner wall surface radius R1 of the recessed part, and the radius R of other parts of the drainage cavity in the second embodiment of the present invention.

[0021] 1. Pump body; 11. Cover; 12. Water inlet cavity; 13. Water inlet pipe; 14. Drainage cavity; 15. Drain pipe; 16. Water passing hole; 17. First intersection line; 171. First edge endpoint; 141. Recessed part; 1411. Connection part; 18. Second intersection line; 181. Second edge endpoint; 2. Motor; 21. Stator; 22. Rotor; 23. Impeller; 211. Accommodating cavity; 221. Shaft; 231. Sleeve; 232. Central hole; 233. Inner blade; 234. Outer blade; 235. Upper water baffle; 236. Lower water baffle; 237. Water suction hole; 238. Sleeve; 239. Balance hole; 2351. First conical surface; 2361. Second conical surface; 3. Sealing ring. Specific embodiments

[0022] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only one embodiment of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0024] It should be noted that the terms "including" and "having" in the specification and claims of the present invention and any deformation thereof are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or equipment including a series of steps or units does not necessarily have to be limited to those clearly listed steps or units, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or equipment.

[0025] Figures 1 to 8 In the first embodiment, as shown, a washing machine drain pump for increasing flow rate and saving electric energy includes: a pump body 1, a motor 2, and a sealing ring 3.

[0026] In the first embodiment, asFigure 1 and Figure 2 As shown in Figure 2 , the pump body 1 includes a cover 11, a water inlet chamber 12, a water inlet pipe 13, a water discharge chamber 14, a water discharge pipe 15, and a water passing hole 16. The water inlet pipe 13 is arranged on the side wall of the water inlet chamber 12 and communicates with the water inlet chamber 12. The water discharge pipe 15 is arranged on the side wall of the water discharge chamber 14 and communicates with the water discharge chamber 14. The water passing hole 16 is arranged between the water inlet chamber 12 and the water discharge chamber 14. The water inlet chamber 12 and the water discharge chamber 14 are coaxially arranged, and the ratio of the diameter of the water inlet chamber 12 to the diameter D3 of the water discharge chamber 14 is between 0.7 and 0.9; In the first embodiment, as Figure 2 、 Figure 3 and Figure 7 shown, the motor 2 includes a stator 21, a rotor 22, and an impeller 23. The rotor 22 is placed in the accommodating chamber 211 of the stator 21. The rotor 22 has a shaft 221. The impeller 23 has a sleeve 231, a central hole 232, inner blades 233, outer blades 234, an upper water baffle 235, a lower water baffle 236, and a water suction hole 237. One end of the shaft 221 extends into the central hole 232 and is in interference fit with the central hole 232. The rotor 22 drives the impeller 23 to rotate forward or backward. The inner blades 233 extend radially from the outer side wall of the sleeve 231 to the water suction hole 237. The outer blades 234 are arranged between the upper water baffle 235 and the lower water baffle 236 and connect the upper water baffle 235 and the lower water baffle 236. The upper water baffle 235 and the lower water baffle 236 are in a conical ring shape. The ratio of the outer diameter D1 of the water suction hole 237 to the diameter D2 of the conical ring edge of the lower water baffle 236 is between 0.6 and 0.8; In the first embodiment, as Figure 4 and Figure 7 shown, wherein, the impeller 23 is placed in the water discharge chamber 14, and the center line of the water discharge chamber 14 coincides with the center line of the shaft 221 on the Z line. The ratio of the diameter D2 of the conical ring edge of the lower water baffle 236 to the diameter D3 of the water discharge chamber 14 is between 0.6 and 0.8; In the first embodiment, as Figure 3 and Figure 4 shown, wherein, in the plane passing through the center line Y of the water discharge pipe 15 and the center line Z of the shaft 221, the center line Y of the water discharge pipe 15 is perpendicular to the center line Z of the shaft 221. The water discharge pipe 15 and the water discharge chamber 14 form a first intersection line 17 at the intersection inside the water discharge chamber 14. As Figure 8 shown, the purpose of setting the outer blades 234 as straight blades is to make the drainage flow rates in two rotation directions the same when the motor 2 rotates forward or backward. As Figure 3 and Figure 4As shown in the figure, the outer blade 234 forms a wrap angle α along the first conical surface 2351 of the upper water baffle 235, along the second conical surface 2361 of the lower water baffle 236, towards the inner hole of the drain pipe 15 and the two first edge endpoints 171 of the first intersection line 17. The drainage direction of the outer blade 234 radiates towards the inner hole of the drain pipe 15 and the inner hole edge along the range of the wrap angle α. The connection line of the two first edge endpoints 171 is perpendicular to the center line Y of the drain pipe 15. The generatrix of the first conical surface 2351 of the upper water baffle 235 and the generatrix of the second conical surface 2361 of the lower water baffle 236 are symmetrically distributed about the center line Y of the drain pipe 15. The wrap angle α is associated with the radius r of the drain pipe 15 and the radius R of the drainage cavity 14, and satisfies the relational expression: α = 2β = 2 arctan , and the wrap angle α is obtained by using the arctangent function, where α is twice of β, and β is the angle between the center line Y of the drain pipe 15 and the generatrix of the first conical surface 2351 of the upper water baffle 235 or the generatrix of the second conical surface 2361 of the lower water baffle 236. Considering the size of the space required for the drainage pump to be accommodated in the washing machine and the drainage flow rate required by the washing machine, the value range of β is selected to be between 15° and 20°, and the value range of R is between 23 and 27 millimeters. From the above arctangent function, it can be known that tanβ = ; thus, it is deduced that the radius r of the drain pipe 15 is between 6.16 and 9.83 millimeters. When the above parameters β, R, and r take the intermediate values within their respective value ranges, the use effect is the best; In the first embodiment, as Figure 2 shown, the sealing ring 3 is arranged at the joint of the pump body 1 and the motor 2. The sealing ring 3 is arranged at the joint of the pump body 1 and the motor 2 to prevent the pressure leakage of the drainage cavity 14 and ensure the formation of negative pressure in the water suction hole 237 and the water flow velocity.

[0027] In the first embodiment, the rotor 22 drives the impeller 23 to rotate forward or backward. The water flow passes through the water inlet pipe 13, the water inlet cavity 12, and the water passing hole 16 in sequence. The negative pressure generated by the rotation of the inner blade 233 forms a suction force to suck the water flow into the water suction hole 237. As shown by the arrows of the water inlet direction F1 and the water drainage direction F2 of the water flow marked in Figure 3 , the upper water baffle 235 and the lower water baffle 236 in the shape of a conical ring restrict and induce the drainage direction. The water flow passes through the outer blade 234 and radiates towards the inner hole of the drain pipe 15 and the inner hole edge along the first conical surface 2351 of the upper water baffle 235 and the second conical surface 2361 of the lower water baffle 236, reducing the flow loss of draining in other directions. In particular, the turbulence formed by the drainage direction of the traditional impeller jetting towards the water inlet cavity repels the fluid sucked from the water inlet cavity by the traditional impeller, resulting in the slowdown or blockage of the water flow velocity from the water inlet cavity into the drainage cavity, and finally causing partial flow loss. Therefore, the present invention restricts and induces the drainage direction, especially through the relational expression α = 2β = 2 arctan Precisely restrict and induce the drainage direction to maximize the drainage flow rate Q of the drain pipe. Example 2, as Figures 1 to 3 and Figures 5 to 11 shown, a washing machine drain pump for increasing flow rate and saving electric energy, comprising: a pump body 1, a motor 2 and a sealing ring 3.

[0028] In Example 2, as Figure 1 , Figure 2 , Figure 9 and Figure 10 shown, the pump body 1 includes a cover 11, a water inlet chamber 12, a water inlet pipe 13, a drainage chamber 14, a drain pipe 15 and a water passing hole 16. The water inlet pipe 13 is arranged on the side wall of the water inlet chamber 12 and communicates with the water inlet chamber 12. The drain pipe 15 is arranged on the side wall of the drainage chamber 14 and communicates with the drainage chamber 14. The water passing hole 16 is arranged between the water inlet chamber 12 and the drainage chamber 14. As Figure 10 shown, the drainage chamber 14 further has a recessed portion 141. The recessed portion 141 is close to the position where the drain pipe 15 communicates with the drainage chamber 14. The inner wall surface radius R1 of the recessed portion 141 is greater than the radius R of the inner wall surface of other parts of the drainage chamber 14. R1 and R are concentrically arranged. The recessed portion 141 is provided with a connecting portion 1411 for connecting the inner wall surface of the recessed portion 141 with a radius of R1 and the inner wall surface of the drainage chamber 14 close to the drain pipe 15 with a radius of R, and is connected to the inner hole edge of the drain pipe 15 in a slope structure, and the connecting portion 1411 is tangent to the inner wall surface of the drainage chamber 14 close to the drain pipe 15 with a radius of R; In Example 2, as Figure 2 , Figure 3 and Figure 7 shown, the motor 2 includes a stator 21, a rotor 22 and an impeller 23. The rotor 22 is placed in the accommodation cavity 211 of the stator 21. The rotor 22 has a shaft 221. The impeller 23 has a sleeve 231, a central hole 232, inner blades 233, outer blades 234, an upper water baffle 235, a lower water baffle 236 and a water suction hole 237. One end of the shaft 221 extends into the central hole 232. The rotor 22 drives the impeller 23 to rotate forward or backward. The inner blades 233 extend from the outer side wall of the sleeve 231 in the radial direction to the water suction hole 237. The outer blades 234 are arranged between the upper water baffle 235 and the lower water baffle 236 and connect the upper water baffle 235 and the lower water baffle 236. The upper water baffle 235 and the lower water baffle 236 are in a conical ring shape. The ratio of the outer circle diameter D1 of the water suction hole 237 to the diameter D2 of the conical ring edge of the lower water baffle 236 is between 0.6 and 0.8; In Example 2, as Figure 10 and Figure 11 shown, wherein, the impeller 23 is placed in the drainage chamber 14, and the center line of the drainage chamber 14 coincides with the center line of the shaft 221 on the Z line; In the second embodiment, as Figure 3 and Figure 11 shown, in the plane passing through the center line Y of the drain pipe 15 and the center line Z of the shaft 221, the center line Y of the drain pipe 15 is perpendicular to the center line Z of the shaft 221. At the intersection of the drain pipe 15 and the inner wall surface of the recess 141 inside the drainage cavity 14, a second intersection line 18 is formed. As Figure 8 shown, the purpose of setting the outer blade 234 as a straight blade is to make the drainage flow rates in two rotation directions the same when the motor 2 rotates forward or backward. As Figure 3 and Figure 11 shown, the outer blade 234 forms a wrap angle α along the first conical surface 2351 of the upper water baffle 235 and along the second conical surface 2361 of the lower water baffle 236 towards the inner hole of the drain pipe 15 and the two second edge endpoints 181 of the second intersection line 18. The drainage direction of the outer blade 234 radiates towards the inner hole of the drain pipe 15 and the inner hole edge along the range of the wrap angle α. The connection line of the two second edge endpoints 181 is perpendicular to the center line Y of the drain pipe 15. The generatrix of the first conical surface 2351 of the upper water baffle 235 and the generatrix of the second conical surface 2361 of the lower water baffle 236 are symmetrically distributed with respect to the center line Y of the drain pipe 15. The wrap angle α is associated with the ratio K of the radius r of the drain pipe 15, the inner wall surface radius R1 of the recess 141, and the radius R of other parts of the drainage cavity 14, and satisfies the relational expression: α = 2β = 2arctan = 2arctan . By using the arctangent function, the wrap angle α is obtained, where α is twice β, and β is the angle between the center line Y of the drain pipe 15 and the generatrix of the first conical surface 2351 of the upper water baffle 235 or the generatrix of the second conical surface 2361 of the lower water baffle 236. Considering the size of the space required for the drainage pump to be accommodated in the washing machine and the drainage flow rate required by the washing machine, the value range of β is selected to be between 15° and 20°. K is the ratio of the inner wall surface radius R1 of the recess 141 to the radius R of other parts of the drainage cavity 14, R1 = KR, the value range of K is between 1.05 and 1.2, and the value range of R is between 23 and 27 millimeters. From the above arctangent function, it can be known that tanβ = ; thus, it is deduced that the radius r of the drain pipe 15 is between 6.47 and 11.79 millimeters. When the above parameters β, K, R, and r take the intermediate values within their respective value ranges, the use effect is the best; Compared with the first embodiment above, the main difference in the second embodiment is that in this technical solution, the drainage cavity 14 also has a recess 141. The inner wall surface of the drainage cavity 14 is mainly composed of the inner wall surface with a radius R of other parts of the drainage cavity 14 and the inner wall surface with a radius R1 of the recess 141. For any value of K within the range of 1.05 to 1.2, the extended line endpoints of the generatrix of the first conical surface 2351 of the upper water baffle 235 and the generatrix of the second conical surface 2361 of the lower water baffle 236 always respectively fall on the two second edge endpoints 181 of the second intersection line 18 at the intersection inside the drainage cavity 14 between the drain pipe 15 and the inner wall surface of the recess 141, so that the drainage direction of the outer blades 234 always radiates along the range of the included angle α towards the inner hole and the inner hole edge of the drain pipe 15. This technical solution can also improve the drainage flow rate of the drain pipe 15.

[0029] In the first embodiment: When the pump body 1 remains unchanged, that is, the radius R of the drainage cavity 14 of the pump body 1 is 25 mm, and the radius r of the drain pipe 15 of the pump body 1 is 7.9 mm. According to the relationship: α = 2β = 2arctan, the included angle α formed by the outer blades 234 of the impeller 23 facing the inner hole of the drain pipe 15 is 35°. In order to verify whether the flow rate is the largest after the above parameters are determined, the value of the included angle α is changed, that is, with the included angle α as the center, different angles are taken on both sides of the included angle α to judge the flow rate change brought by the change. The above pump body 1 is used as a fixed quantity and 3D printed, and a series of impellers 23 with different angles are respectively 3D printed one by one, and a series of experimental prototypes are formed with the pump body 1 for flow rate testing. The test data is as follows: Table 1. Test data table of the first embodiment

[0030] In the second embodiment: When the pump body 1 remains unchanged, that is, the radius R of the drainage cavity 14 of the pump body 1 is 25 mm, and the radius r of the drain pipe 15 of the pump body 1 is 9.13 mm. According to the relationship: α = 2β = 2arctan = 2arctan, the included angle α formed by the outer blades 234 of the impeller 23 facing the inner hole of the drain pipe 15 is 35°. In order to verify whether the flow rate is the largest after the above parameters are determined, the value of the included angle α is changed, that is, with the included angle α as the center, different angles are taken on both sides of the included angle α to judge the flow rate change brought by the change. The above pump body 1 is used as a fixed quantity and 3D printed, and a series of impellers 23 with different angles are respectively 3D printed one by one, and a series of experimental prototypes are formed with the pump body 1 for flow rate testing. The test data is as follows: Table 2. Test data table of the second embodiment

[0031] Therefore, combining the above experimental data analysis, by setting the value of the wrap angle α and precisely constraining and inducing the drainage direction, the drainage flow radiates towards the inner hole and the edge of the inner hole of the drain pipe 15 within the range of the wrap angle α formed by the first conical surface 2351 of the upper water baffle 235 and the second conical surface 2361 of the lower water baffle 236 of the outer blade 234, which can increase the drainage flow of the drain pipe 15.

[0032] In the second embodiment, as Figure 2 shown, the sealing ring 3 is arranged at the joint of the pump body 1 and the motor 2. The sealing ring 3 is arranged at the joint of the pump body 1 and the motor 2 to prevent the pressure leakage of the drainage cavity 14 and ensure the formation of negative pressure in the water suction hole 237 and the water flow velocity.

[0033] In the second embodiment, the rotor 22 drives the impeller 23 to rotate forward or backward. The water flow passes through the water inlet pipe 13, the water inlet cavity 12, and the water passing hole 16 in sequence. The negative pressure generated by the rotation of the inner blade 233 forms a suction force to suck the water flow into the water suction hole 237. As Figure 3 shown by the arrows of the water inlet direction F1 of the water flow and the water drainage direction F2 of the water flow marked in the figure, the upper water baffle 235 and the lower water baffle 236 in the shape of a conical ring constrain and induce the drainage direction. The water flow radiates towards the inner hole and the edge of the inner hole of the drain pipe 15 along the first conical surface 2351 of the upper water baffle 235 and the second conical surface 2361 of the lower water baffle 236 through the outer blade 234, reducing the flow loss of drainage in other directions. Especially, it greatly reduces the repulsive force between the turbulent flow formed by the water jet in the drainage direction of the impeller 23 towards the water inlet cavity 12 and the fluid sucked by the impeller 23 from the water inlet cavity 12, which causes the water flow velocity from the water inlet cavity 12 into the drainage cavity 14 to slow down or be blocked, ultimately resulting in partial flow loss. Therefore, by constraining and inducing the drainage direction, the drainage flow radiates towards the inner hole and the edge of the inner hole of the drain pipe 15 within the range of the wrap angle formed by the first conical surface 2351 of the upper water baffle 235 and the second conical surface 2361 of the lower water baffle 236 of the outer blade 234 to increase the drainage flow of the drain pipe 15. The present invention maximally increases the drainage flow Q of the drain pipe by precisely constraining and inducing the drainage direction, especially through the relational expression α = 2β = 2arctan = 2arctan for precisely constraining and inducing the drainage direction.

[0034] In the first embodiment or the second embodiment, as Figure 6 and Figure 7As shown, a sleeve 238 is provided on the outer side of the casing 231, and the sleeve 238 is coaxially arranged with the casing 231. The ratio of the outer diameter D4 of the sleeve 238 to the diameter D6 of the conical annular edge of the upper water baffle 235 is between 0.4 and 0.6. And the diameter D6 of the conical annular edge of the upper water baffle 235 is equal to the diameter D2 of the conical annular edge of the lower water baffle 236. The inner blade 233 is connected to the top of the sleeve 238 in the axial direction. A balance hole 239 is provided on the outer side of the sleeve 238. The diameter D5 of the balance hole 239 is not greater than the outer diameter D1 of the water absorption hole 237. And the ratio of the outer diameter D4 of the sleeve 238 to the diameter D5 of the balance hole 239 is between 0.6 and 0.8; In the first embodiment or the second embodiment, as Figure 3 and Figure 7 shown, the cross-sectional area of the inner blade 233 gradually increases from the outer wall of the casing 231 to the outer circle of the water absorption hole 237. The cross-sectional area of the outer blade 234 gradually increases from the outer circle of the water absorption hole 237 to the outer edge of the outer blade 234. The water absorption hole 237 is coaxially arranged with the water passing hole 16. The ratio of the outer diameter D1 of the water absorption hole 237 to the diameter of the water passing hole 16 is between 0.8 and 1; In the first embodiment or the second embodiment, as Figure 6 and Figure 8 shown, the number of blades of the inner blade 233 and the outer blade 234 is set between 4 and 6. And the number of the inner blade 233 does not exceed the number of the outer blade 234. In the first embodiment or the second embodiment, the number of blades of the inner blade 233 and the outer blade 234 is equal between 4 and 6. The inner blade 233 and the outer blade 234 are evenly distributed. The inner blade 233 is a straight blade. The cross-sections of the inner blade 233 and the outer blade 234 in the radial direction are in the same plane. And the inner blade 233 and the outer blade 234 are connected; In the first embodiment or the second embodiment, the motor 2 is a single-phase AC permanent magnet synchronous motor or a three-phase permanent magnet synchronous motor. The impeller 23 is made of engineering plastic. The pump body 1 is made of a combination of engineering plastic and rubber.

[0035] For a washing machine drain pump of the present invention that improves flow rate and saves electric energy, on the one hand, compared with the prior art, under the condition of the same drain pump power, the drain flow rate can be increased by about 20%. On the other hand, compared with the prior art, under the conditions of the same head and drain flow rate requirements, the present invention can reduce the power of the drain pump to save electric energy by about 15% - 20%. Therefore, the present invention can well achieve the purpose of improving flow rate and saving electric energy.

[0036] It is understandable that the above specific description of the present invention is only for explaining the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced to achieve the same technical effects; as long as the use requirements are met, they are all within the protection scope of the present invention.

Claims

1. A washing machine drainage pump for increasing flow and saving electric energy, characterized in that: include: A pump body (1) and a motor (2), wherein the pump body (1) comprises a cover (11), a water inlet chamber (12), a water inlet pipe (13), a water discharge chamber (14), a water discharge pipe (15) and a water through hole (16); the motor (2) comprises a stator (21), a rotor (22) and an impeller (23); the rotor (22) comprises a shaft (221); the impeller (23) comprises a sleeve (231), a center hole (232), inner blades (233), outer blades (234), an upper water retaining plate (235), a lower water retaining plate (236) and a water suction hole (237); the upper water retaining plate (235) and the lower water retaining plate (236) are in the shape of a conical ring; In the plane of the center line of the drain pipe (15) and the center line of the axis (221), the drain pipe (15) and the drain cavity (14) form a first intersection line (17) at the intersection inside the drain cavity (14); the outer blade (234) forms an angle of α along the first conical surface (2351) of the upper water retaining plate (235) and the second conical surface (2361) of the lower water retaining plate (236) toward the inner hole of the drain pipe (15) and the two first edge end points (171) of the first intersection line (17); the drainage direction of the outer blade (234) radiates toward the inner hole of the drain pipe (15) and the edge of the inner hole along the range of the angle of α; the angle of α is associated with the radius r of the drain pipe (15) and the radius R of the drain cavity (14) and satisfies the relationship: α=2β=2arctan , β is the angle between the center line of the drainage pipe (15) and the generatrix of the first conical surface (2351) of the upper water retaining plate (235) or the generatrix of the second conical surface (2361) of the lower water retaining plate (236), the radius R of the drainage cavity (14) is in the range of 23 to 27 millimeters and the value range of β is in the range of 15° to 20°.

2. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1, characterized in that: The water inlet pipe (13) is arranged on the side wall of the water inlet chamber (12) and is in communication with the water inlet chamber (12); the drainage pipe (15) is arranged on the side wall of the drainage chamber (14) and is in communication with the drainage chamber (14); the water through hole (16) is arranged between the water inlet chamber (12) and the drainage chamber (14); the water inlet chamber (12) and the drainage chamber (14) are coaxially arranged; the diameter of the water inlet chamber (12) is equal to that of the drainage chamber (14); The ratio of the diameter D3 of the lower water retaining plate (236) to the outer diameter D1 of the water absorption hole (237) is between 0.7 and 0.9; the ratio of the diameter D2 of the conical annular edge of the lower water retaining plate (236) to the diameter D1 of the water absorption hole (237) is between 0.6 and 0.8; the center line of the drainage cavity (14) coincides with the center line of the shaft (221), and the ratio of the diameter D2 of the conical annular edge of the lower water retaining plate (236) to the diameter D3 of the drainage cavity (14) is between 0.6 and 0.8; The impeller (23) is placed in the drainage cavity (14); the rotor (22) is placed in the accommodating cavity (211) of the stator (21); one end of the shaft (221) extends into the center hole (232); the rotor (22) drives the impeller (23) to rotate forward or reversely, the inner blades (233) extend from the outer wall of the sleeve (231) in the radial direction to the water suction hole (237), the outer blades (234) are straight blades, and the outer blades (234) are arranged on the upper water retaining plate (23 5) and the lower water retaining plate (236), and connecting the upper water retaining plate (235) and the lower water retaining plate (236); the center line of the drain pipe (15) is perpendicular to the center line of the axis (221), the line connecting the two first edge end points (171) is perpendicular to the center line of the drain pipe (15), and the generatrix of the first conical surface (2351) of the upper water retaining plate (235) and the generatrix of the second conical surface (2361) of the lower water retaining plate (236) are symmetrically distributed about the center line of the drain pipe (15); It also comprises a sealing ring (3), wherein the sealing ring (3) is arranged at the junction of the pump body (1) and the motor (2).

3. A washing machine drainage pump for increasing flow and saving electric energy, characterized in that: include: A pump body (1), the pump body (1) comprising a cover (11), a water inlet chamber (12), a water inlet pipe (13), a water discharge chamber (14), a water discharge pipe (15), and a water through hole (16), the water inlet pipe (13) being arranged on a side wall of the water inlet chamber (12) and being in communication with the water inlet chamber (12), the water discharge pipe (15) being arranged on a side wall of the water discharge chamber (14) and being in communication with the water discharge chamber (14), the water through hole (16) being arranged on the side wall of the water inlet chamber (12) and being in communication with the water discharge chamber (14), 12) and the drainage cavity (14), the drainage cavity (14) further comprising a recessed portion (141), the recessed portion (141) being close to a position where the drainage pipe (15) is connected to the drainage cavity (14), the inner wall radius R1 of the recessed portion (141) being greater than the inner wall radius R of other portions of the drainage cavity (14), and the inner wall radius R1 of the recessed portion (141) being concentric with the inner wall radius R of other portions of the drainage cavity (14); A motor (2), the motor (2) comprising a stator (21), a rotor (22) and an impeller (23), the rotor (22) being placed in a receiving cavity (211) of the stator (21), the rotor (22) having a shaft (221), the impeller (23) having a sleeve (231), a center hole (232), inner blades (233), outer blades (234), an upper water retaining plate (235), a lower water retaining plate (236) and a water suction hole (237), one end of the shaft (221) extending into the center hole (232), the rotor (22) driving the impeller (23 ) rotates forward or reversely, the inner blades (233) extend from the outer wall of the sleeve (231) in the radial direction to the water absorption hole (237), the outer blades (234) are arranged between the upper water baffle plate (235) and the lower water baffle plate (236), and connect the upper water baffle plate (235) and the lower water baffle plate (236), the upper water baffle plate (235) and the lower water baffle plate (236) are in the shape of a conical ring, the ratio of the outer diameter D1 of the water absorption hole (237) to the conical ring edge diameter D2 of the lower water baffle plate (236) is between 0.6 and 0.8, The impeller (23) is placed in the drainage chamber (14), and the center line of the drainage chamber (14) coincides with the center line of the shaft (221). Wherein, in a plane passing through the center line of the drain pipe (15) and the center line of the axis (221), the center line of the drain pipe (15) is perpendicular to the center line of the axis (221); the drain pipe (15) and the inner wall surface of the recessed portion (141) form a second intersection line (18) at the intersection inside the drain cavity (14); the outer blade (234) is a straight blade; and the outer blade (234) forms an angle of α along the first conical surface (2351) of the upper water retaining plate (235) and along the second conical surface (2361) of the lower water retaining plate (236) toward the inner hole of the drain pipe (15) and the two second edge end points (181) of the second intersection line (18). The drainage direction of the outer blade (234) radiates toward the inner hole and the edge of the inner hole of the drainage pipe (15) along the range of the wrap angle α, the line connecting the two second edge end points (181) is perpendicular to the center line of the drainage pipe (15), the generatrix of the first conical surface (2351) of the upper water retaining plate (235) and the generatrix of the second conical surface (2361) of the lower water retaining plate (236) are symmetrically distributed about the center line of the drainage pipe (15), the wrap angle α is associated with the radius r of the drainage pipe (15) and the ratio K of the radius R1 of the inner wall surface of the recessed portion (141) to the radius R of other parts of the drainage cavity (14), and the relationship is satisfied: α=2β=2arctan =2arctan , wherein β is the angle between the center line of the drainage pipe (15) and the generatrix of the first conical surface (2351) of the upper water retaining plate (235) or the generatrix of the second conical surface (2361) of the lower water retaining plate (236), and the value range of β is between 15° and 20°, K is the ratio of the radius R1 of the inner wall surface of the recessed portion (141) to the radius R of other parts of the drainage cavity (14), R1=KR, the value range of K is between 1.05 and 1.2, and the value range of R is between 23 and 27 millimeters; A sealing ring (3) is arranged at the junction of the pump body (1) and the motor (2).

4. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1 or 3, characterized in that: The sleeve (238) is provided on the outside of the sleeve (231), and the sleeve (238) is coaxially arranged with the sleeve (231), the ratio of the outer diameter D4 of the sleeve (238) to the conical annular edge diameter D6 of the upper water retaining plate (235) is between 0.4 and 0.6, and the conical annular edge diameter D6 of the upper water retaining plate (235) is equal to the conical annular edge diameter D2 of the lower water retaining plate (236), and the inner blade (233) is connected to the top of the sleeve (238) in the axial direction.

5. A washing machine drainage pump for increasing flow and saving electric energy according to claim 4, characterized in that: The sleeve (238) has a balancing hole (239) on its outer side, the diameter D5 of the balancing hole (239) is not greater than the outer diameter D1 of the water absorption hole (237), and the ratio of the outer diameter D4 of the sleeve (238) to the diameter D5 of the balancing hole (239) is between 0.6 and 0.

8.

6. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1 or 3, characterized in that: The cross-sectional area of ​​the inner blade (233) gradually increases from the outer wall of the sleeve (231) to the outer circle of the water absorption hole (237), and the cross-sectional area of ​​the outer blade (234) gradually increases from the outer circle of the water absorption hole (237) to the outer edge of the outer blade (234).

7. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1 or 3, characterized in that: The water absorption hole (237) is coaxially arranged with the water passing hole (16), and the ratio of the outer diameter D1 of the water absorption hole (237) to the diameter of the water passing hole (16) is between 0.8 and 1.

8. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1 or 3, characterized in that: The number of the inner blades (233) and the outer blades (234) is set between 4 and 6, and the number of the inner blades (233) does not exceed the number of the outer blades (234), and the inner blades (233) and the outer blades (234) are evenly distributed; the inner blades (233) are straight blades, the cross-sections of the inner blades (233) and the outer blades (234) in the radial direction are in the same plane, and the inner blades (233) and the outer blades (234) are connected.

9. A washing machine drainage pump for increasing flow and saving electric energy according to claim 1 or 3, characterized in that: The motor (2) is a single-phase AC permanent magnet synchronous motor or a three-phase permanent magnet synchronous motor, the impeller (23) is made of engineering plastics, and the pump body (1) is made of a combination of engineering plastics and rubber.

10. A washing machine, characterized in that: It comprises a washing machine drainage pump for increasing flow rate and saving electric energy as described in any one of claims 1 to 9.

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