A washing machine drain pump and a washing machine for improving flow rate and saving electric energy

Abstract

The present invention discloses a washing machine drain pump and a washing machine for improving flow rate and saving electric energy, which includes a pump body, a motor and a sealing ring. The sealing ring is placed at the joint of the pump body and the motor. The water in the washing machine drum sequentially passes through the water inlet pipe, the water inlet cavity, the water passing holes and the water suction holes. Through the constraint and induction of the drainage direction by the conical annular upper water baffle and the lower water baffle, the water flows along the outer blades and radiates towards the inner hole and the edge of the inner hole of the drain pipe along the first conical surface of the upper water baffle and the second conical surface of the lower water baffle, reducing the flow loss of drainage in other directions. The present invention improves the drainage flow rate of the drain pipe by precisely constraining and inducing the drainage direction, and the drainage flow 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. Under the conditions of the same head and drainage flow rate requirements, the present invention can also save electric energy in the power of the drain 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 market currently, since the impeller does not reasonably restrict the drainage direction in terms of structure, the drainage water flow splashes around the drainage cavity. In particular, the turbulent flow 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, partial flow loss occurs and the drainage efficiency is low. Drain pumps with such a structure often increase the effective drainage area of the impeller blades or increase the number of blades to make up for the flow 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 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 such a structure, in practical applications, although the energy consumption is reduced, 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 and enhances the hydraulic efficiency to a certain extent, it still cannot effectively control the drainage direction and is not satisfactory in terms of improving the flow rate.

[0005] A drainage impeller, a drainage pump set and a washing machine with the same, the patent publication number of which is 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 multiple blades, the shapes of the multiple 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 of the blade 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 some 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 purpose, the present invention adopts the following technical solutions:

[0008] 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.

[0009] 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, thereby increasing the drainage flow rate;

[0010] 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;

[0011] 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;

[0012] 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 along 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 relational expression: 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 mm. The above relationship can more accurately control and constrain the drainage direction of the outer blades 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;

[0013] 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.

[0014] The present invention also adopts the following another technical solution:

[0015] A washing machine drainage pump for improving flow rate and saving electric energy, comprising:

[0016] 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, and 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;

[0017] 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, 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 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 suction of the water flow by the water suction hole. A reasonable ratio range is to ensure a balance between the two;

[0018] 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;

[0019] 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 blade is a straight blade, and the outer blade forms 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 blade 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 radius R1 of the inner wall surface 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;

[0020] 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.

[0021] The rotor drives the impeller to rotate forward or backward. The water flow passes through the water inlet pipe, water inlet cavity, and water passing hole in sequence. The negative pressure generated by the rotation of the inner blades forms suction force, sucking the water flow into the water absorption 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, resulting in the slowdown or obstruction of the water flow velocity from the water inlet cavity into the drainage cavity, and ultimately causing 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.

[0022] Preferably, the outer side of the sleeve has a sleeve, and the sleeve is coaxially arranged with the sleeve. The setting 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. The 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 blades. 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.

[0023] Preferably, the outer side of the sleeve has balance holes, the diameter D5 of the balance holes is not greater than the outer circle 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 circle 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.

[0024] Preferably, the cross-sectional area of the inner blades gradually increases from the outer side wall of the sleeve to 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 to 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 of the outer blades.

[0025] Preferably, the water absorption holes and the water passing holes are coaxially arranged, and the ratio of the outer circle 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 inhaled by the water absorption holes can be improved.

[0026] Preferably, the number of blades of the inner blades and the outer blades is set between 4 and 6, and the number of inner blades does not exceed the number of 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 with the least work.

[0027] 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.

[0028] 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 plastic, and the pump body is made of a combination of engineering plastic and rubber, which is convenient for simplifying the process, reducing the cost and improving the production efficiency.

[0029] The present invention also relates to a washing machine containing the above-mentioned washing machine drain pump for increasing the flow rate and saving electric energy.

[0030] The above structure of the present invention can achieve the following beneficial effects:

[0031] The ratio of the outer 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 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 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;

[0032] In particular, in the present invention, through the restraint and induction of the drainage direction by 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. In particular, 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 speed from the inlet cavity to the drainage cavity and causing partial flow loss. Through the restraint and induction of the drainage direction in the present invention, the drainage flow 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;

[0033] 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

[0034] 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;

[0035] Figure 2 is Figure 1 a cross-sectional view taken along the A-A direction in;

[0036] Figure 3 It is a schematic diagram of the structure for improving the flow rate according to the present invention;

[0037] 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;

[0038] Figure 5 It is a three-dimensional structure schematic diagram of the impeller according to the present invention;

[0039] Figure 6 It is a front view structure schematic diagram of the impeller according to the present invention;

[0040] Figure 7 is Figure 6 The sectional view taken along the B-B direction in

[0041] Figure 8 is Figure 6 The sectional view taken along the C-C direction in

[0042] Figure 9 The schematic structural diagram of the pump body in the second embodiment of the present invention;

[0043] Figure 10 is Figure 9 The sectional view taken along the D-D direction in

[0044] Figure 11 The schematic diagram showing the association of the wrap angle α in the second embodiment of the present invention 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 drain cavity.

[0045] 1. Pump body; 11. Cover; 12. Water inlet cavity; 13. Water inlet pipe; 14. Drain cavity; 15. Drain pipe; 16. Water passing hole; 17. First intersection line; 171. First edge end point; 141. Recessed part; 1411. Connection part; 18. Second intersection line; 181. Second edge end point; 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. Detailed implementation manners

[0046] The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

[0047] 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 in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only one of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0048] It should be noted that the terms "including" and "having" in the description and claims of the present invention and the above-mentioned accompanying drawings

[0049] "and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, device, product, or equipment that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or equipment."

[0050] Example 1, as Figures 1 to 8 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.

[0051] In Example 1, as Figure 1 and Figure 2 shown, 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;

[0052] In Example 1, 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 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;

[0053] In Example 1, 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;

[0054] In Example 1, as Figure 3 andFigure 4 As 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 inside the drain cavity 14 between the drain pipe 15 and the drain cavity 14, a first intersection line 17 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 4 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 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 drain 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 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;

[0055] 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 drain cavity 14 and ensure the formation of negative pressure in the water suction hole 237 and the water flow velocity.

[0056] 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 holes 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 3As shown by the arrows of the water inlet direction F1 and the water drainage direction F2 marked therein, the conical annular upper water baffle 235 and the lower water baffle 236 constrain and induce the water drainage direction. The water flows 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 blades 234 and radiates towards the inner hole of the drain pipe 15 and the edge of the inner hole, reducing the flow loss of draining water in other directions. In particular, the turbulence formed by the water jet from the traditional impeller in the water drainage direction towards the water inlet cavity repels the fluid sucked by the traditional impeller from the water inlet cavity, resulting in a slowdown or obstruction of the water flow from the water inlet cavity into the water drainage cavity, and ultimately causing partial flow loss. Therefore, the present invention constrains and induces the water drainage direction, especially through the relational expression α = 2β = 2arctan Precisely constraining and inducing the water drainage direction to maximize the drainage flow rate Q of the drain pipe.

[0057] Embodiment 2, as Figures 1 to 3 and Figures 5 to 11 shown, a washing machine drain pump for improving the flow rate and saving electric energy includes: a pump body 1, a motor 2, and a sealing ring 3.

[0058] In Embodiment 2, as Figure 1 , Figure 2 , Figure 9 and Figure 10 shown, the pump body 1 includes a cover 11, a water inlet cavity 12, a water inlet pipe 13, a water drainage cavity 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 cavity 12 and communicates with the water inlet cavity 12. The drain pipe 15 is arranged on the side wall of the water drainage cavity 14 and communicates with the water drainage cavity 14. The water passing hole 16 is arranged between the water inlet cavity 12 and the water drainage cavity 14. As Figure 10 shown, the water drainage cavity 14 further has a recessed portion 141. The recessed portion 141 is close to the position where the drain pipe 15 communicates with the water drainage cavity 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 water drainage cavity 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 water drainage cavity 14 close to the drain pipe 15 with a radius of R, and is connected to the edge of the inner hole of the drain pipe 15 in a slope structure, and the connecting portion 1411 is tangent to the inner wall surface of the water drainage cavity 14 close to the drain pipe 15 with a radius of R;

[0059] In Embodiment 2, as Figure 2 , Figure 3 and Figure 7As shown, the motor 2 includes a stator 21, a rotor 22, and an impeller 23. The rotor 22 is placed inside 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 radially from the outer sidewall 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;

[0060] In the second embodiment, as Figure 10 and Figure 11 shown, wherein, the impeller 23 is placed inside the drainage cavity 14, and the center line of the drainage cavity 14 coincides with the center line of the shaft 221 on the Z line;

[0061] In the second embodiment, as Figure 3 and Figure 11 shown, wherein, 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. The drain pipe 15 and the inner wall surface of the recess 141 form a second intersection line 18 at the intersection inside the drainage cavity 14. As Figure 8 shown, the purpose of setting the outer blades 234 as straight blades is that when the motor 2 rotates forward or backward, the drainage flow rates in the two rotation directions are the same. As Figure 3 and Figure 11 shown, the outer blades 234 form a wrap angle α along the first conical surface 2351 of the upper water baffle 235 and 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 blades 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 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 ratio K of the inner wall surface radius R1 of the recess 141 to the radius R of other parts of the drainage cavity 14, and satisfies the relational expression: α = 2β = 2arctan = 2arctan , the included angle α is obtained by using the arctangent function, where α is twice that of β, and β is the included 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 radius R1 of the concave 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. 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;

[0062] Compared with the above-mentioned first embodiment, the main difference in the second embodiment is that the drainage cavity 14 in this technical solution further has a concave portion 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 concave portion 141. For any value of K within the range of 1.05 to 1.2, the extension 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 internal intersection of the drain pipe 15 and the inner wall surface of the concave portion 141 in the drainage cavity 14, so that the drainage direction of the outer blade 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.

[0063] 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 millimeters, and the radius r of the drain pipe 15 of the pump body 1 is 7.9 millimeters. According to the relational expression: α = 2β = 2arctan, the included angle α formed by the outer blade 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 is 3D printed, and a series of impellers 23 with different angles are 3D printed respectively, and a series of experimental prototypes are formed with the pump body 1 for flow rate testing. The test data are as follows:

[0064] Table 1. Test data table of the first embodiment

[0065]

[0066] In Embodiment 2: 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°. 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, taking different angles on both sides of the included angle α with the included angle α as the center to judge the flow rate change brought by the change. The above pump body 1 is used as a fixed quantity and printed by 3D printing, and a series of impellers 23 with different angles are printed by 3D printing respectively to form a series of experimental prototypes with the pump body 1 for flow rate testing. The test data is as follows:

[0067] Table 2. Test data table of Embodiment 2

[0068]

[0069] Therefore, combining the above experimental data analysis, by setting the value of the included angle α and precisely constraining and inducing the drainage direction, the drainage flow rate radiates to the inner hole and the edge of the inner hole of the drain pipe 15 within the included 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 improve the drainage flow rate of the drain pipe 15.

[0070] In Embodiment 2, 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.

[0071] In Embodiment 2, 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 blades 233 forms a suction force to suck the water flow into the water suction hole 237, as Figure 3As indicated by the arrows of the water inlet direction F1 and the water drainage direction F2 marked therein, the upper water baffle 235 and the lower water baffle 236 in the shape of a conical ring constrain and induce the water drainage direction. The water flows 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 blades 234 and radiates towards the inner hole of the drain pipe 15 and the edge of the inner hole, reducing the flow loss of draining water in other directions. In particular, it greatly reduces the repulsive force between the turbulence formed by the water jet in the water 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 from the water inlet cavity 12 into the water drainage cavity 14 to slow down or be blocked, ultimately resulting in partial flow loss. Therefore, by constraining and inducing the water drainage direction, the drainage flow radiates towards the inner hole of the drain pipe 15 and the edge of the inner hole within the included angle range 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 blades 234, so as to increase the drainage flow of the drain pipe 15. The present invention constrains and induces the water drainage direction, especially through the relational expression α = 2β = 2arctan = 2arctan Precisely constrains and induces the water drainage direction to maximize the drainage flow Q of the drain pipe.

[0072] In the first embodiment or the second embodiment, as Figure 6 and Figure 7 shown, the outer side of the sleeve 231 has a sleeve 238, and the sleeve 238 is coaxially arranged with the sleeve 231. The ratio of the outer diameter D4 of the sleeve 238 to the diameter D6 of the conical ring edge of the upper water baffle 235 is between 0.4 and 0.6, and the diameter D6 of the conical ring edge of the upper water baffle 235 is equal to the diameter D2 of the conical ring edge of the lower water baffle 236. The inner blade 233 is connected to the top of the sleeve 238 in the axial direction. The outer side of the sleeve 238 has a balance hole 239, the diameter D5 of the balance hole 239 is not greater than the outer diameter D1 of the water suction 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;

[0073] 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 sleeve 231 towards the outer circle of the water suction hole 237, and the cross-sectional area of the outer blade 234 gradually increases from the outer circle of the water suction hole 237 towards the outer edge of the outer blade 234. The water suction hole 237 is coaxially arranged with the water passing hole 16, and the ratio of the outer diameter D1 of the water suction hole 237 to the diameter of the water passing hole 16 is between 0.8 and 1;

[0074] In the first embodiment or the second embodiment, as Figure 6 and Figure 8As 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 inner blades 233 does not exceed the number of outer blades 234. In the first embodiment or the second embodiment, the number of blades of the inner blade 233 and the outer blade 234 between 4 and 6 is equal. 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;

[0075] 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, and the pump body 1 is made of a combination of engineering plastic and rubber.

[0076] A washing machine drain pump for improving flow rate and saving electric energy according to the present invention. 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.

[0077] It can be understood 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 effect; as long as it meets the use requirements, it is within the protection scope of the present invention.

Claims

1. A washing machine drain pump for improving flow rate and saving electric energy, characterized in that, Comprising: A pump body (1), 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 discharge chamber (14) further has a recessed portion (141). The recessed portion (141) is close to the position where the water discharge pipe (15) communicates with the water discharge 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 water discharge chamber (14). The inner wall surface radius R1 of the recessed portion (141) and the radius R of the inner wall surface of other parts of the water discharge chamber (14) are concentrically arranged; A motor (2), the motor (2) includes a stator (21), a rotor (22) and an impeller (23). The rotor (22) is placed in the accommodation 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). 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 circle diameter D1 of the water suction hole (237) to the conical ring edge diameter D2 of the lower water baffle (236) is between 0.6 and 0.

8. 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). Wherein, in the plane passing through the center line of the drain pipe (15) and the center line of the shaft (221), the center line of the drain pipe (15) is perpendicular to the center line of the shaft (221). The drain pipe (15) and the inner wall surface of the recess (141) form a second intersection line (18) at the intersection inside the drainage cavity (14). The outer blade (234) is a straight blade, and the outer blade (234) forms a wrap angle α towards the inner hole of the drain pipe (15) and the two second edge endpoints (181) of the second intersection line (18) 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). 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 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 of the drain pipe (15). The wrap angle α is associated with the radius r of the drain pipe (15) and the ratio K of the inner wall surface radius R1 of the recess (141) to the radius R of other parts of the drainage cavity (14), and satisfies the relationship: α = 2β = 2arctan = 2arctan , where β is the angle between the center line 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), and the value range of β is 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; A sealing ring (3) is arranged at the joint of the pump body (1) and the motor (2).

2. The washing machine drain pump for improving flow rate and saving electric energy according to claim 1, characterized in that, The outer side of the sleeve (231) has a sleeve (238), and the sleeve (238) is coaxially arranged with the sleeve (231). The ratio of the outer circle diameter D4 of the sleeve (238) to the conical ring edge diameter D6 of the upper water baffle (235) is between 0.4 and 0.

6. And the conical ring edge diameter D6 of the upper water baffle (235) is equal to the conical ring edge diameter D2 of the lower water baffle (236). The inner blades (233) are connected to the top of the sleeve (238) in the axial direction.

3. The washing machine drain pump for improving flow rate and saving electric energy according to claim 2, characterized in that, The outer side of the sleeve (238) is provided with balance holes (239), the diameter D5 of the balance holes (239) is not greater than the outer diameter D1 of the water absorption holes (237), and the ratio of the outer diameter D4 of the sleeve (238) to the diameter D5 of the balance holes (239) is between 0.6 and 0.

8.

4. The washing machine drain pump for improving flow rate and saving electric energy according to claim 1, characterized in that, The cross-sectional area of the inner blade (233) gradually increases from the outer side 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).

5. A washing machine drain pump for increasing flow rate and saving electric energy according to claim 1, 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.

6. The washing machine drain pump for improving flow rate and saving electric energy according to claim 1, characterized in that, 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 blades (233) does not exceed the number of the outer blades (234). The blades of 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.

7. A washing machine drain pump for improving flow rate and saving electric energy according to claim 1, 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.

8. A washing machine, characterized in that, It includes a washing machine drain pump for increasing flow rate and saving electric energy according to any one of claims 1 to 7.

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