Drain impeller with balancing holes

Abstract

A drainage impeller with a balancing hole comprises: an axis, with a plurality of main blades extending radially outward; an annular bottom plate, arranged at the bottom of the plurality of main blades, the bottom surface of the annular bottom plate undulating in a wave-like manner along the circumferential direction of the outer periphery of the annular bottom plate; an annular wall, with its bottom edge arranged at the outer edge of the annular bottom plate, and the bottom edge of the annular wall undulating with the wavy undulation of the annular bottom plate; the annular bottom plate is provided with a plurality of balancing holes penetrating from top to bottom, and the plurality of balancing holes are close to the annular wall. Each of the balancing holes is located below each of the main blades or behind them in the direction of rotation, and is connected to the space behind each of the main blades.

Description

Technical Field

[0001] The invention relates to a drainage device, in particular to a drainage impeller with a balancing hole arranged in a drainage pump. Background Art

[0002] The drain pump used for air conditioners will produce noise, part of which comes from the sound of the impeller blades hitting the bubbles in the water, causing them to burst, or the vibration caused by the change in resistance after hitting the bubbles. Therefore, if the impact force or condition of the impeller blades on the bubbles when pushing water can be reduced, the noise can be effectively reduced.

[0003] Taiwan Patent No. I499724 provides a drainage pump, which divides a large-diameter impeller into an inner and outer impeller (the impeller here is more appropriately called a blade), and through the alternating arrangement of the inner and outer blades, when a vortex is formed, the bubbles are caused to escape to the downstream side in the direction of rotation to reduce the impact on the impeller, and reduce the noise derived from the bubble rupture, and the vibration derived from the impact load of the gas-liquid mixed flow. However, the inventor of this case found that when the impeller rotates, the bubbles located above the impeller usually remain behind the blade in the direction of rotation and close to the blade, and due to the centrifugal force, they will remain at the end of the blade near the outer periphery of the impeller. Therefore, although the aforementioned case guides the bubbles, the guiding path is too long and it is impossible to effectively and quickly guide the bubbles downward.

[0004] Japanese Patent No. 5707086 discloses a drainage pump, wherein a plurality of flow holes (Figure 250) are arranged on the impeller, and these flow holes are located between the main blades and the auxiliary blades, and are evenly distributed at the midpoints between the blades. These flow holes can mainly provide water to flow from the bottom of the impeller to the top, or to flow from the top of the impeller to the bottom, so that the water will not pass through the central through hole (Figure 252). This case mainly utilizes the effect of water pressure balance to allow water to naturally pass through these flow holes, thereby achieving a state of water pressure balance above and below the impeller. However, the flow holes disclosed in this case can only provide the effect of water pressure balance, and can provide a good drainage effect for an environment containing oil in the air, but there is no technical description for the treatment of bubbles in the water. In addition, since when the impeller rotates, if there are bubbles in the water, they usually remain behind the rotation direction of the blades and close to the blades. Therefore, the flow holes in this case cannot provide an effective discharge path for the bubbles. Summary of the invention

[0005] It can be seen from the above-mentioned prior art that the drainage impellers of the currently known drainage pumps fail to provide an effective bubble discharge mechanism. Therefore, the present invention is aimed at this point and proposes a drainage impeller with a balancing hole, which is provided with a plurality of balancing holes and can effectively discharge the bubbles in the water so that they will not remain behind the blades, thereby greatly reducing noise and vibration.

[0006] In order to achieve the above effect, the present invention proposes a drainage impeller with a balancing hole, comprising: an axis with a connecting groove at the top end for connecting a driving shaft to be driven to rotate, the axis radially extending outwardly with a plurality of main blades in the form of vertical walls, and a virtual line formed according to the direction in which each of the main blades extends outwardly is defined as a virtual extension line; an annular bottom plate, arranged at the bottom of the plurality of main blades, and the annular bottom plate is spaced a predetermined distance from the axis, so that a plurality of hollow portions are formed between the axis, the plurality of main blades and the annular bottom plate; the bottom surface of the annular bottom plate is wavy along the circumferential direction of the outer periphery of the annular bottom plate; an annular wall, with its bottom edge arranged at the outer edge of the annular bottom plate, and the bottom edge of the annular wall is arranged along the outer edge of the annular bottom plate The annular bottom plate undulates in a wave-like manner, and the top edge of the annular wall undulates in a wave-like manner. When the bottom edge of the annular wall is high, the top edge is also high, and when the bottom edge is low, the top edge is also low. The annular bottom plate is provided with a plurality of balancing holes penetrating from top to bottom, and a plurality of the balancing holes are close to the annular wall and the distance between the hole edge and the annular wall is less than 1 mm. According to the axis and the rotation direction of a plurality of the main blades, each of the balancing holes is located below each of the main blades or behind the rotation direction of its virtual extension line, and is connected to the space behind each of the main blades, and is not located in front of the rotation direction of the virtual extension line of the main blade. When a balancing hole is located behind a main blade, the distance between the hole edge of the balancing hole and the main blade is less than 1 mm.

[0007] Therefore, during actual operation, the bubbles will not remain behind the blades, but will be discharged outwardly through the multiple balancing holes, thereby solving the problem of noise and vibration that may be caused by the bubbles. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a three-dimensional diagram of a first preferred embodiment of the present invention.

[0009] Figure 2 It is a top view of the first preferred embodiment of the present invention.

[0010] Figure 3 For along Figure 2 Sectional view along line 3-3.

[0011] Figure 4 This is a usage status diagram of the first preferred embodiment of the present invention.

[0012] Figure 5 FIG. 1 is a top view of a second preferred embodiment of the present invention.

[0013] Figure 6 For along Figure 5 Sectional view along line 6-6.

[0014] Figure 7 It is a top view of the third preferred embodiment of the present invention.

[0015] Figure 8 is along Figure 7 Sectional view along line 8-8.

[0016] Fig. 9 It is a top view of another implementation of the third preferred embodiment of the present invention.

[0017] Fig.10 It is a top view of a fourth preferred embodiment of the present invention.

[0018] Fig.11 For along Fig.10 Sectional view along line 11-11.

[0019] Fig.12 It is a top view of a fifth preferred embodiment of the present invention.

[0020] Fig.13 is along Fig.12 Sectional view along line 13-13.

[0021] Fig.14 2 is a top view of a sixth preferred embodiment of the present invention.

[0022] Fig.15 is along Fig.14 Sectional view along line 15-15.

[0023] Fig.16 Similar to Fig. 9 , which is a stereoscopic diagram of another embodiment of the present invention.

[0024] Fig.17 for Fig.16 Right side view.

[0025] Wherein, the reference numerals are:

[0026] 10 Drain impeller with balancing holes

[0027] 11 Axis

[0028] 111 Connection slot

[0029] 12 Main blade

[0030] 15 Ring bottom plate

[0031] 151 Balance hole

[0032] 16 Hollow

[0033] 17 Annular wall

[0034] 20 Drain impeller with balancing holes

[0035] 21 Axis

[0036] 22 Main blade

[0037] 23 Secondary Blades

[0038] 25 Ring bottom plate

[0039] 251 Balance hole

[0040] 26 Hollow

[0041] 27 Annular wall

[0042] 30 Drain impeller with balancing holes

[0043] 31 Axis

[0044] 32 Main blade

[0045] 33 Secondary Blades

[0046] 34 Auxiliary blade

[0047] 35 Ring bottom plate

[0048] 351 Balance hole

[0049] 36 Hollow

[0050] 37 Annular wall

[0051] 32' Main Blade

[0052] 33' Secondary Blade

[0053] 34' Auxiliary Blade

[0054] 351' Balance hole

[0055] 40 Drain impeller with balancing holes

[0056] 42 Main blade

[0057] 43 Secondary Blades

[0058] 44 Auxiliary blade

[0059] 451 Balance hole

[0060] 47 Annular wall

[0061] 50 Drain impeller with balancing holes

[0062] 52 Main blade

[0063] 53 Secondary Blades

[0064] 54 Auxiliary blade

[0065] 57 Annular wall

[0066] 60 Drain impeller with balancing holes

[0067] 62 Main blade

[0068] 621 Gap

[0069] 63 Secondary Blades

[0070] 631 Secondary Gap

[0071] 64 Auxiliary blade

[0072] 65 Ring bottom plate

[0073] 651 Balance hole

[0074] 67 Annular wall

[0075] 70 Drain impeller with balancing holes

[0076] 72 Main blade

[0077] 73 Secondary Blades

[0078] 74 Auxiliary blade

[0079] 751 Balance hole

[0080] 77 Annular wall

[0081] 91 Motor

[0082] 92 Drive shaft

[0083] 95 Sump

[0084] 96 Drain

[0085] VL Virtual extension line DETAILED DESCRIPTION

[0086] In order to explain the technical features of the present invention in detail, several preferred embodiments are given below with accompanying drawings, wherein:

[0087] like Figures 1 to 3 As shown, a drainage impeller 10 with a balancing hole provided in a first preferred embodiment of the present invention is mainly composed of an axis 11, an annular bottom plate 15 and an annular wall 17, wherein:

[0088] The shaft 11 has a connecting groove 111 at the top for connecting to a driving shaft 92 of a motor 91 to be driven to rotate. The shaft 11 has a plurality of main blades 12 in the form of vertical walls extending radially outward. A virtual line formed by the outward extension direction of each main blade 12 is defined as a virtual extension line VL.

[0089] The annular bottom plate 15 is disposed at the bottom of the plurality of main blades 12, and the annular bottom plate 15 is spaced a predetermined distance from the axis 11, so that a plurality of hollow portions 16 are formed between the axis 11, the plurality of main blades 12 and the annular bottom plate 15. The bottom surface of the annular bottom plate 15 is undulating along the circumferential direction of the outer periphery of the annular bottom plate 15.

[0090] The annular wall 17 has its bottom edge disposed on the outer edge of the annular bottom plate 15, and the bottom edge of the annular wall 17 rises and falls along with the wave-like rise and fall of the annular bottom plate 15. The top edge of the annular wall 17 rises and falls in a wave-like manner. When the bottom edge of the annular wall 17 is high, the top edge is also high, and when the bottom edge is low, the top edge is also low.

[0091] Among them, the annular bottom plate 15 is provided with a plurality of balancing holes 151 penetrating from top to bottom. The plurality of balancing holes 151 are close to the annular wall 17 and the distance between the hole edges and the annular wall 17 is less than 1 mm. The preferred condition is that the hole edges of the plurality of balancing holes 151 are connected to the inner wall surface of the annular wall 17. Such a setting relationship makes it possible for there to be no distance between the hole edges of the plurality of balancing holes 151 and the inner wall surface of the annular wall 17. In addition, according to the rotation direction of the axis 11 and the plurality of main blades 12, each of the balancing holes 151 is located behind the rotation direction of each of the main blades 12, and is connected to the space behind each of the main blades 12, and the distance between the hole edge of the balancing hole 151 and the main blade 12 is less than 1 mm. In practice, the smaller the distance, the better. The better situation is that the hole edge of the balancing hole 151 is connected to the rear side surface of the main blade 12. Such a setting relationship makes the hole edge of the balancing hole 151 and the main blade 12 have no distance, but is directly adjacent to the rear of the main blade 12. When setting each of the balancing holes 151, its position needs to be considered. It must be set at a position close to one of the main blades 12 and away from other main blades 12, so as to provide a better discharge path for the bubbles behind the main blade 12 that is closer.

[0092] In the first embodiment, each of the main blades 12 is connected to the annular wall 17, and each of the main blades 12 intersects at the high point where the top edge of the annular wall 17 is wavy, and the top edge of each of the main blades 12 is lower than the top edge of the annular wall 17 where each of the main blades 12 is connected to the annular wall 17. Since each of the main blades 12 is directly connected to the annular wall 17, its connection position is equal to the position where its virtual extension line VL intersects the annular wall 17.

[0093] The structure of the first embodiment has been described above, and its operation will be described next.

[0094] like Figure 4 As shown, the present invention is used by connecting the top end of the axis 11 to the driving shaft 92 of a motor 91, and placing the drainage impeller 10 of the present invention in a water collecting tank 95. When there is water in the water collecting tank 95 and the motor 91 drives the drainage impeller 10 to rotate, the wavy structure on the bottom surface of the annular bottom plate 15 and the multiple main blades 12 on the top surface will drive the water to rotate in the water collecting tank 95 and form a vortex, which is then discharged to the outside through a drainage port 96. By means of the wavy undulating structure of the bottom surface of the annular bottom plate 15 and the wavy undulating structure of the annular wall 17, a water-repelling effect can be provided and bubbles are not easily generated. Even if bubbles are still generated during the water-repelling process, the centrifugal force when the drainage impeller 10 rotates will cause the bubbles on the top surface of the annular bottom plate 15 to move toward the annular wall 17, and finally be blocked by the inner surface of the annular wall 17, and also remain in the rear space of each main blade 12 in the rotation direction and close to each main blade 12. At this time, since the multiple balancing holes 151 are connected to the space behind the multiple main blades 12, an escape path can be provided to allow bubbles to be discharged downward from the multiple balancing holes 151, and water can also enter and exit from the multiple balancing holes 151, thereby achieving the effect of balancing the water pressure below and above the annular bottom plate 15, and discharged outward from the drainage port 96 along with the vortex. Since the multiple balancing holes 151 are located right behind each of the main blades 12, which is where the bubbles are located, the bubbles can be easily discharged without remaining. In this way, there will be no problem of noise being generated by the bubbles being broken, and there will be no vibration caused by changes in resistance caused by the bubbles. Therefore, the technology of the present invention can significantly reduce noise and vibration.

[0095] Please refer to Figure 5 to Figure 6 The second preferred embodiment of the present invention provides a drainage impeller 20 with a balancing hole, which is mainly similar to the first embodiment mentioned above, except that:

[0096] The second embodiment further includes a plurality of secondary blades 23 disposed on the top surface of the annular bottom plate 25, the plurality of secondary blades 23 extending radially along the radial direction of the axis 21, and the plurality of secondary blades 23 are separated from the axis 21 by a predetermined distance without contacting, and the plurality of secondary blades 23 do not extend to the plurality of hollow portions 26. In addition, a virtual line formed according to the extending direction of each of the secondary blades 23 is defined as a virtual extension line VL. Each of the secondary blades 23 is connected to the annular wall 27.

[0097] Each of the balancing holes 251 is located below the primary blades 22 and the secondary blades 23 , and communicates with the space behind each of the primary blades 22 and the space behind each of the secondary blades 23 .

[0098] In addition, the top edge heights of the plurality of main blades 22 and the plurality of secondary blades 23 are set to be the same. Each of the main blades 22 and each of the secondary blades 23 intersects at the high point position where the top edge of the annular wall 27 is wavy, and the top edge of each of the main blades 22 and each of the secondary blades 23 is lower than the top edge of the annular wall 27 at this position. The setting mode that the height of the blades 22, 23 is lower than the height of the annular wall 27 is mainly to match the low point height of the top edge of the annular wall 27 that is wavy, so as to prevent the water from overflowing too easily from the top edge of the annular wall 27 after the plurality of main blades 22 and secondary blades 23 move the water during actual operation. In the second embodiment, since the plurality of secondary blades 23 are directly connected to the annular wall 27, their connection position is equal to the position where their virtual extension line VL intersects with the annular wall 27.

[0099] When the second embodiment is in use, although the balancing holes 251 are not located behind the main blades 22 and the secondary blades 23, but below, since the multiple balancing holes 251 are still connected to the space behind the multiple main blades 22 and the multiple secondary blades 23, bubbles can still be discharged downward through the multiple balancing holes 251 during operation. The multiple secondary blades 23 are provided in order to have additional secondary blades 23 in addition to the main blades 22 to assist in water displacement, thereby achieving a better water displacement effect. Although from the diagram, the second embodiment is equivalent to replacing part of the main blades of the first embodiment with secondary blades, so the number of water displacement blades has not increased, however, this is only for convenience of explanation. In fact, it is also possible to add secondary blades to the number of main blades of the original first embodiment, which is easy to understand.

[0100] As for the main blades 22 and the secondary blades 23 being located at the high point of the undulating top edge of the annular wall 27, they can be used to cooperate with the undulating top edge of the annular wall 27 to produce a water-drifting effect, thereby achieving the best water-drifting effect. In other words, if the main blades 22 and the secondary blades 23 are not located at the high point or low point of the undulating top edge of the annular wall 27, the water-drifting effect cannot be so well coordinated.

[0101] For the multiple secondary blades 23, although the multiple balance holes 251 in the second embodiment are located below them, it can be understood with reference to the first embodiment that the multiple balance holes 251 can also be set behind the multiple secondary blades 23. The consideration point for setting them at the rear is the same as the reason for setting them at the first embodiment relative to the main blades, that is, they must be set at a position closer to the secondary blade 23.

[0102] The rest of the structure and the effects that can be achieved in the second embodiment are similar to those of the first embodiment, and will not be described in detail.

[0103] like Figures 7 and 8 As shown, a drainage impeller 30 with a balancing hole proposed in the third preferred embodiment of the present invention is mainly similar to the second embodiment mentioned above, except that:

[0104] It further includes a plurality of auxiliary blades 34, which are arranged on the top surface of the annular bottom plate 35. The plurality of auxiliary blades 34 extend radially along the radial direction of the axis 31 and are shorter than the plurality of secondary blades 33. The plurality of auxiliary blades 34 are separated from the axis 31 by a predetermined distance without contacting, and the plurality of auxiliary blades 34 do not extend to the plurality of hollow portions 36. The virtual line formed by the extending direction of each auxiliary blade 34 is defined as a virtual extension line VL. The plurality of auxiliary blades 34 are connected to the annular wall 37. The annular bottom plate 35 is also provided with a balancing hole 351 below each auxiliary blade 34, and is connected to the space behind each auxiliary blade 34.

[0105] In addition, the top edge heights of the plurality of main blades 32, the plurality of secondary blades 33, and the plurality of auxiliary blades 34 are set to be the same. Each of the main blades 32 and each of the secondary blades 33 intersects at the low point where the top edge of the annular wall 37 is wavy, so that the top edge of each of the main blades 32 and each of the secondary blades 33 is at the same height as the top edge of the annular wall 37, while each of the auxiliary blades 34 intersects at the high point where the top edge of the annular wall 37 is wavy. In the second embodiment, since the plurality of secondary blades 33 are directly connected to the annular wall 37, their connection position is equal to the position where their virtual extension line VL intersects with the annular wall 37. As for the main blades 32 and the secondary blades 33 being located at the low point of the wavy top edge of the annular wall 37, and the auxiliary blades 34 being located at the high point of the wavy top edge of the annular wall 37, they can be used to cooperate with the wavy top edge of the annular wall 37 to produce a water-displacing effect, thereby achieving the best water-displacing effect. In other words, if the main blades 32, the secondary blades 33, and the auxiliary blades 34 are not located at the high point or low point of the wavy top edge of the annular wall 37, the water-displacing effect cannot be coordinated so well.

[0106] When the third embodiment is in operation, the plurality of auxiliary blades 34 provide an effect of assisting water displacement. In addition, the plurality of balancing holes 351 are also disposed below the plurality of auxiliary blades 34, thereby still providing an effective effect of discharging bubbles.

[0107] It is worth adding that Fig. 9As shown, the plurality of auxiliary blades 34' in the third embodiment may not have corresponding balancing holes arranged thereunder, but only balancing holes 351' may be arranged below the plurality of main blades 32 and the plurality of secondary blades 33'. In such an arrangement, although the bubbles behind the plurality of auxiliary blades 34' cannot be discharged during operation, there are still balancing holes 351' below the plurality of main blades 32' and the plurality of secondary blades 33' to discharge the bubbles. Therefore, although the overall effect is slightly worse, it still has the effect of discharging bubbles.

[0108] The rest of the structure and the effects that can be achieved in the third embodiment are similar to those of the second embodiment, and will not be described in detail.

[0109] like Figure 10 to Figure 11 As shown, a drainage impeller 40 with a balancing hole proposed in the fourth preferred embodiment of the present invention is mainly similar to the third embodiment mentioned above, except that:

[0110] The auxiliary blades 44 are spaced apart from the annular wall 47 by a predetermined distance, and no corresponding balancing hole is disposed below or behind each of the auxiliary blades 44 .

[0111] During operation of the fourth embodiment, since each of the auxiliary blades 44 is separated from the annular wall 47 by a predetermined distance, bubbles in the water will move along the inner wall of the annular wall 47 due to the centrifugal force, and thus will not be retained behind each of the auxiliary blades 44. Therefore, the plurality of auxiliary blades 44 can provide an auxiliary water-repelling effect without causing the retention of bubbles, and further, it is not necessary to provide a balancing hole below or behind the auxiliary blades 44, and the bubbles in the water will still be discharged from the balancing hole 451 provided below each of the main blades 42 and each of the secondary blades 43.

[0112] The rest of the structure and the effects that can be achieved in the fourth embodiment are similar to those of the third embodiment, and will not be described in detail.

[0113] like Figure 12 to Figure 13 As shown, a drainage impeller 50 with a balancing hole proposed in the fifth preferred embodiment of the present invention is mainly similar to the fourth embodiment mentioned above, except that:

[0114] Each of the main blades 52 and each of the secondary blades 53 intersects at the high point position of the wavy top edge of the annular wall 57, and each of the auxiliary blades 54 intersects at the low point position of the wavy top edge of the annular wall 57 with its virtual extension line VL. In addition, the top edge heights of the multiple main blades 52 and the multiple secondary blades 53 are the same, while the top edge heights of the multiple auxiliary blades 54 are lower than the top edges of the multiple main blades 52 and the multiple secondary blades 53, and present a state of different heights. Such a setting method of different heights is mainly to match the high point position and the low point position of the wavy top edge of the annular wall 57, so as to form a good water-repelling effect during operation.

[0115] The rest of the structure and the effects that can be achieved in the fifth embodiment are similar to those in the fourth embodiment, and will not be described in detail.

[0116] like Figure 14 to Figure 15 As shown, the drainage impeller 60 with a balancing hole proposed in the sixth preferred embodiment of the present invention is mainly similar to the fifth embodiment mentioned above, except that:

[0117] The plurality of main blades 62 are spaced a predetermined distance from the annular wall 67 to form a gap 621, and the annular bottom plate 65 in each of the gaps 621 is provided with a balancing hole 651, and is located below the virtual extension line VL of each of the main blades 62. Each of the secondary blades 63 is spaced a predetermined distance from the annular wall 67 to form a secondary gap 631, and the annular bottom plate 65 in each of the secondary gaps 631 is provided with a balancing hole 651, and is located below the virtual extension line VL of each of the secondary blades 62.

[0118] When the drainage impeller of the sixth embodiment is in operation, since each of the main blades 62, each of the secondary blades 63 and each of the auxiliary blades 64 are separated from the annular wall 67 by a predetermined distance, the bubbles in the water will move along the inner wall of the annular wall 67 due to the centrifugal force, and will not be retained behind the aforementioned blades 62, 63, 64. When the bubbles move to the top of the plurality of balancing holes 651, they will be discharged downward from the plurality of balancing holes 651 due to the water pressure.

[0119] The rest of the structure and the effects that can be achieved in the sixth embodiment are similar to those of the fifth embodiment, and will not be described in detail again.

[0120] In the above six embodiments, the annular wall is wavy in shape, but in fact, it can also be substantially horizontal. Fig.16 and Fig.17In the embodiment, the bottom edge of the annular wall 77 and the top edge of the annular wall 77 of the drainage impeller 70 are substantially horizontal without wave-like undulations. Although this design cannot provide auxiliary water-repelling effect to water by means of the wave-like undulations, in actual operation, the main water-repelling effect is produced by the multiple main blades 72, the multiple secondary blades 73 and the multiple auxiliary blades 74, which are not wave-like undulations. Therefore, the bottom edge of the annular wall 77 and the top edge of the annular wall 77 can be set to be substantially horizontal, and the reduction in the water-repelling effect is limited, and bubbles can still be discharged by means of the multiple balancing holes 751.

[0121] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A drainage impeller with a balancing hole, characterized in that: Contains: An axis having a connection groove at the top thereof for connecting to a driving shaft to be driven to rotate, the axis radially extending outwardly from a plurality of main blades in the form of vertical walls, and a virtual line formed by the outward extension direction of each main blade is defined as a virtual extension line; an annular bottom plate, disposed at the bottom of the plurality of main blades, and the annular bottom plate is spaced a predetermined distance from the axis, so that a plurality of hollow portions are formed between the axis, the plurality of main blades and the annular bottom plate; and an annular wall, with its bottom edge disposed on the outer edge of the annular bottom plate; Features: The annular bottom plate is provided with a plurality of balancing holes penetrating vertically, wherein the plurality of balancing holes are close to the annular wall and the distance between the hole edge and the annular wall is less than 1 mm; According to the axis and the rotation direction of the plurality of main blades, each of the balancing holes is located below each of the main blades or behind the rotation direction of its virtual extension line, and is connected to the space behind each of the main blades, but is not located in front of the rotation direction of the virtual extension line of the main blade; wherein, when a balancing hole is located behind a main blade, the distance between the hole edge of the balancing hole and the main blade is less than 1 mm, and the center of the balancing hole is closer to the main blade and farther away from other main blades.

2. The drainage impeller with balancing holes according to claim 1, characterized in that: Each of the main blades is connected to the annular wall.

3. The drainage impeller with balancing holes according to claim 1, characterized in that: The end of each main blade is separated from the annular wall by a predetermined distance to form a gap, and each balancing hole is located in the gap.

4. The drainage impeller with balancing holes according to claim 1, characterized in that: The bottom surface of the annular bottom plate undulates in a wave-like manner along the circumferential direction of the outer periphery of the annular bottom plate; the bottom edge of the annular wall undulates along with the undulating shape of the annular bottom plate, and the top edge of the annular wall undulates in a wave-like manner. When the bottom edge of the annular wall is high, the top edge is also high, and when the bottom edge is low, the top edge is also low.

5. The drainage impeller with balancing holes according to claim 4, characterized in that: The virtual extension lines of the main blades intersect at the high point of the wavy top edge of the annular wall.

6. The drainage impeller with balancing holes according to claim 4, characterized in that: The virtual extension lines of the main blades intersect at the low point of the top edge of the annular wall where the top edge undulates in a wave shape.

7. The drainage impeller with balancing holes according to claim 1, characterized in that: The bottom edge of the annular wall and the top edge of the annular wall are substantially horizontal without undulations.

8. The drainage impeller with balancing holes according to claim 1, characterized in that: The top edge of each main blade is flush with the top edge of the annular wall where the virtual extension line of each main blade intersects the annular wall.

9. The drainage impeller with balancing holes according to claim 1, characterized in that: The top edge of each main blade is lower than the top edge of the annular wall where the virtual extension line of each main blade intersects the annular wall.

10. The drainage impeller with balancing holes according to claim 1, characterized in that: When the balancing hole is located behind the main blade, the hole edge of the balancing hole is connected to the rear side surface of the main blade.

11. The drainage impeller with balancing holes according to claim 1, characterized in that: The invention further comprises a plurality of secondary blades, which are arranged on the top surface of the annular bottom plate. The plurality of secondary blades extend radially along the radial direction of the axis, and the plurality of secondary blades are separated from the axis by a predetermined distance without contacting the axis, and the plurality of secondary blades do not extend to the plurality of hollow parts. A virtual line formed according to the direction in which each of the secondary blades extends is defined as a virtual extension line. According to the rotation direction of the axis and the plurality of secondary blades, a balancing hole is arranged below each of the secondary blades or behind the rotation direction of its virtual extension line, and is connected to the space behind each of the secondary blades, but is not located in front of the rotation direction of the virtual extension line of the secondary blade. When the balancing hole is located behind the secondary blade, the distance between the hole edge of the balancing hole and the secondary blade is less than 1 mm, and the center of the balancing hole is closer to the secondary blade and farther away from other main blades or secondary blades.

12. The drainage impeller with balancing holes according to claim 11, characterized in that: Each of the secondary blades is connected to the annular wall.

13. The drainage impeller with balancing holes according to claim 11, characterized in that: Each of the main blades is connected to the annular wall.

14. The drainage impeller with balancing holes according to claim 11, characterized in that: Each of the secondary blades is spaced a predetermined distance from the annular wall to form a secondary gap, and the annular bottom plate in each of the secondary gaps is provided with a balancing hole.

15. The drainage impeller with balancing holes according to claim 11, characterized in that: The end of each main blade is separated from the annular wall by a predetermined distance to form a gap, and each balancing hole is located in the gap.

16. The drainage impeller with balancing holes according to claim 11, characterized in that: The bottom surface of the annular bottom plate undulates in a wave-like manner along the circumferential direction of the outer periphery of the annular bottom plate; the bottom edge of the annular wall undulates along with the undulating shape of the annular bottom plate, and the top edge of the annular wall undulates in a wave-like manner. When the bottom edge of the annular wall is high, the top edge is also high, and when the bottom edge is low, the top edge is also low.

17. The drainage impeller with balancing holes according to claim 16, characterized in that: The virtual extension lines of the main blades intersect at the high point of the wavy top edge of the annular wall.

18. The drainage impeller with balancing holes according to claim 16, characterized in that: The virtual extension lines of the secondary blades intersect at the high point of the wavy top edge of the annular wall.

19. The drainage impeller with balancing holes according to claim 16, characterized in that: The virtual extension lines of the main blades intersect at the low point of the top edge of the annular wall where the top edge undulates in a wave shape.

20. The drainage impeller with balancing holes according to claim 16, characterized in that: The virtual extension lines of the secondary blades intersect at the low point of the top edge of the annular wall where the top edge undulates in a wave shape.

21. The drainage impeller with balancing holes according to claim 11, characterized in that: The bottom edge of the annular wall and the top edge of the annular wall are substantially horizontal without undulations.

22. The drainage impeller with balancing holes according to claim 11, characterized in that: The top edge of each main blade is flush with the top edge of the annular wall where the virtual extension line of each main blade intersects the annular wall.

23. The drainage impeller with balancing holes according to claim 11, characterized in that: The top edge of each of the secondary blades is flush with the top edge of the annular wall where the virtual extension line of each of the secondary blades intersects the annular wall.

24. The drainage impeller with balancing holes according to claim 11, characterized in that: The top edge of each main blade is lower than the top edge of the annular wall where the virtual extension line of each main blade intersects the annular wall.

25. The drainage impeller with balancing holes according to claim 11, characterized in that: The top edge of each of the secondary blades is lower than the top edge of the annular wall where the virtual extension line of each of the secondary blades intersects the annular wall.

26. The drainage impeller with balancing holes according to claim 11, characterized in that: When the balancing hole is located behind the secondary blade, the hole edge of the balancing hole is connected to the rear side surface of the secondary blade.

27. The drainage impeller with balancing holes according to claim 11, characterized in that: When the balancing hole is located behind the main blade, the hole edge of the balancing hole is connected to the rear side surface of the main blade.

28. The drainage impeller with balancing holes according to claim 11, characterized in that: The height of the top edges of the plurality of main blades is the same as the height of the top edges of the plurality of secondary blades.

29. The drainage impeller with balancing holes according to claim 11, characterized in that: It further includes a plurality of auxiliary blades disposed on the top surface of the annular bottom plate. The plurality of auxiliary blades extend radially along the radial direction of the axis and are shorter than the plurality of secondary blades. The plurality of auxiliary blades are spaced a predetermined distance from the axis without contacting the axis. The plurality of auxiliary blades do not extend to the plurality of hollow portions. A virtual line formed according to the extension direction of each of the auxiliary blades is defined as a virtual extension line.

30. The drainage impeller with balancing holes according to claim 29, characterized in that: A plurality of auxiliary blades are connected to the annular wall.

31. The drainage impeller with balancing holes according to claim 29, characterized in that: The plurality of auxiliary blades are spaced apart from the annular wall by a predetermined distance.

32. The drainage impeller with balancing holes according to claim 29, characterized in that: According to the axis and the rotation direction of the plurality of auxiliary blades, a balancing hole is provided below or behind each auxiliary blade and is connected to the space behind each auxiliary blade, and is not located in front of the auxiliary blade; wherein, when a balancing hole is located behind an auxiliary blade, the distance between the hole edge of the balancing hole and the auxiliary blade is less than 1 mm.

33. The drainage impeller with balancing holes according to claim 29, characterized in that: The height of the top edges of the plurality of main blades is the same as the height of the top edges of the plurality of secondary blades, and the height of the top edges of the plurality of auxiliary blades is the same as the height of the top edges of the plurality of main blades.

34. The drainage impeller with balancing holes according to claim 29, characterized in that: The height of the top edges of the plurality of main blades is the same as the height of the top edges of the plurality of secondary blades, and the height of the top edges of the plurality of auxiliary blades is different from the height of the top edges of the plurality of main blades.

35. The drainage impeller with balancing holes according to claim 29, characterized in that: The virtual extension lines of the main blades and the secondary blades intersect at the high point of the wavy top edge of the annular wall; the virtual extension lines of the auxiliary blades intersect at the low point of the wavy top edge of the annular wall.

36. The drainage impeller with balancing holes according to claim 29, characterized in that: The virtual extension lines of the main blades and the secondary blades intersect at the low point of the wavy top edge of the annular wall; the virtual extension lines of the auxiliary blades intersect at the high point of the wavy top edge of the annular wall.

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