CN210068551U - Impeller and water pump - Google Patents
Impeller and water pump Download PDFInfo
- Publication number
- CN210068551U CN210068551U CN201920690308.1U CN201920690308U CN210068551U CN 210068551 U CN210068551 U CN 210068551U CN 201920690308 U CN201920690308 U CN 201920690308U CN 210068551 U CN210068551 U CN 210068551U
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- water pump
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 241000237942 Conidae Species 0.000 claims description 6
- 210000001503 joint Anatomy 0.000 claims description 5
- 239000000463 material Substances 0.000 abstract description 7
- 238000001746 injection moulding Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model provides an impeller and water pump. An impeller, characterized by: including base, wheel hub and a plurality of blade, wheel hub is located on the base, including the first portion and the second portion that from top to bottom link to each other and the coaxial line, the lower bottom surface of second portion is greater than its upper bottom surface, a plurality of blades are from the outside radial extension of wheel hub's surface, include from last blade top, blade middle part and the blade bottom that connects gradually down, and the width at blade top and the width of blade bottom all are greater than the width at blade middle part. The impeller of the utility model can reduce the power consumption of the water pump and improve the low-voltage starting capability under the condition of the same pump cover and motor of the water pump; under the condition that the lift flow is the same, the novel impeller is smaller in size, saves materials and improves the efficiency of the water pump.
Description
Technical Field
The utility model belongs to the technical field of the water pump, especially, relate to an impeller and water pump.
Background
In the prior art, a centrifugal water pump is generally used as a power source for draining water in a washing machine, a dish washer and the like. The centrifugal water pump comprises a pump shell, an impeller, a rotating shaft and a motor for driving the impeller to rotate; the pump shell is provided with a water inlet and a water outlet; the existing impeller (shown in fig. 1) is mounted on a rotating shaft and placed within the pump housing cavity. The sewage after washing in the washing machine and the dish washer enters the pump shell cavity of the centrifugal pump from the water inlet of the pump shell, and the motor drives the rotating shaft and the impeller to rotate. The outside sewage is continuously sucked from the water inlet and is thrown out from the water outlet of the pump shell through the driving of the impeller.
Since the drainage pump of the household appliance generally has the requirement of foreign matter prevention, the diameter and the height value of the cavity of the pump cover are much larger than those of the impeller so as to leave enough space for the foreign matters to pass through, which causes the drainage pump to have low hydraulic efficiency, high power consumption and waste of materials.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model aims at providing an impeller, which can reduce the power consumption of the water pump and improve the low-pressure starting capability under the condition of the same pump cover and motor of the water pump; under the condition that the lift flow is the same, the novel impeller is smaller in size, saves materials and improves the efficiency of the water pump.
The utility model adopts the following technical scheme:
an impeller, characterized by: including base, wheel hub and a plurality of blade, wheel hub is located on the base, including the first portion and the second portion that from top to bottom link to each other and the coaxial line, the lower bottom surface of second portion is greater than its upper bottom surface, a plurality of blades are from the outside radial extension of wheel hub's surface, and each blade includes from last blade top, blade middle part and the blade bottom that connects gradually down, and the width at blade top and the width of blade bottom all are greater than the width at blade middle part.
The utility model discloses an impeller, its wheel hub and each blade are different with conventional wheel hub, blade shape. When the impeller is applied to a water pump, the first part of the impeller is used for being fixed with a rotating shaft of the water pump, and the lower bottom surface of the second part is larger than the upper bottom surface of the second part, namely the second part can be a symmetrical frustum body, a frustum shell or a circular truncated cone body and a circular truncated cone shell; the fluid movement area of the centrifugal water pump is the space in the pump cover cavity except for the impeller, if the pump cover is unchanged, the fluid movement space is reduced due to the specific shape of the second part of the hub compared with the traditional hub, so that the pressure in the cavity is increased, and the efficiency of the water pump is improved; on the other hand, because the specific shape of wheel hub and blade, under the same flow, make the utility model discloses an impeller diameter can accomplish littleer, and the impeller diameter is little and makes the torsional moment that the blade received (the resistance that water gave the impeller) reduce, to the same motor, can improve the low pressure start-up performance of water pump.
In one embodiment, the first portion is cylindrical and the second portion is a circular truncated cone housing. The embodiment limits the specific shape of the hub, and the energy loss caused by fluid impact can be further reduced due to the fact that the outer surface of the hub is an arc surface.
Further, the blade top comprises a top plate and a concave arc-shaped supporting rib formed by extending from the top plate to the middle of the blade, and the blade bottom comprises a bottom plate and a concave arc-shaped supporting rib formed by extending from the bottom plate to the middle of the blade.
In one embodiment, the middle part of the blade is in a flat plate shape, and the cross section of the blade is in an I shape or an X shape. When no flow guide groove is formed on the top plate and the bottom plate, the cross section of the blade is I-shaped; when the guide grooves are arranged at the top and the bottom, the cross section of the blade is X-shaped.
As a preferred embodiment, the blade further has a plurality of guiding grooves, each guiding groove is formed downward from the top plate or upward from the bottom plate, so that the blade is in a Y shape when viewed from above or from above and has an outward opening. Through the setting of guiding gutter, water pump efficiency can further improve, and it is very useful to injection moulding's impeller, make the impeller both can practice thrift materials and make things convenient for the drawing die when moulding plastics like this on the one hand, on the other hand because the thickness of moulding plastics of blade top and blade bottom reduces, can avoid the blade to produce the blade again behind injection moulding and contract, the deformation scheduling problem, avoided the harmfulness that follow-up outward appearance change produced, can improve the intensity after the blade shaping and improve the life of impeller. The guiding groove may be provided only at the top of the blade, only at the bottom of the blade, at all the tops and bottoms of the blade, or at the top of a part of the blade and/or at the bottom of a part of the blade, preferably at all the tops and bottoms of the blade.
In a preferred embodiment, the top surface of the blade and the bottom surface of the blade are both planes perpendicular to the axis of the hub, the middle part of the blade is centrally perpendicular to the top surface of the blade and the bottom surface of the blade, the cross section of the blade is symmetrical left and right, and up and down, and the thickness of the middle part of the blade is equal to that of the arc-shaped supporting rib.
As a preferred embodiment, each blade extends from the bottom end of the hub in the height direction, and the height of the blade is represented as H2, the height of the second part is represented as H3, and the height of the second part is 0.75H2 ≦ H3 ≦ H2. This preferred embodiment makes it possible to obtain an optimum head of the pump.
As an embodiment, the impeller is formed by connecting a first component and a plurality of second components, the first component comprises a base, a hub and a plurality of blade supporting seats radially extending outwards from the hub, the blade supporting seats comprise blade bottoms and first supporting plates connected to the blade bottoms, and the second component and the blade supporting seats are in butt joint one by one to form the blades. The impeller with the structure can be manufactured by respectively injection molding the first part and the second part, assembling and connecting the second part and the first part, and bonding and fixing the two parts by an adhesive; on the other hand, the impeller is formed by connecting two detachable parts, so that the purpose of changing the control range of the flow and the efficiency can be conveniently achieved by selecting the size parameters of different parts II.
Further, the blade supporting seat still include first blade top with support in the second inside support plate under the first blade top, the blade supporting seat has the first connection face of the radial outside direction towards wheel hub and is located first backup pad is connected the face towards the second of top, part two include the second blade top with support in the second outside support plate under the second blade top, every second blade top and every first blade top radially scarf joint and form the blade top, the second outside support plate respectively with first backup pad scarf joint from top to bottom, with the radial scarf joint of second inside support plate form the blade middle part. As a specific embodiment, a plurality of pairs of oppositely matched plugs/ribs and pits can be arranged on the surfaces which are mutually embedded.
The utility model also provides a water pump, a serial communication port, include the impeller.
The utility model discloses an impeller and water pump has following beneficial effect:
(1) the impeller of the utility model has specific structure and shape, compared with the conventional impeller, the low-pressure starting performance of the water pump is improved, and the response time is shortened during low-pressure starting;
(2) under the condition that the lift and the flow of the water pump are the same, the impeller of the utility model has smaller volume, saves materials and space, and improves the efficiency of the water pump;
(3) the utility model discloses an impeller can also further make the cross-section of blade form X and appear, set up the guiding gutter on the blade promptly, water pump efficiency can further improve, and make the impeller like this both can materials saving when moulding plastics, make things convenient for the drawing die again, on the other hand is owing to reduced blade thickness, can avoid the blade to shrink again behind injection moulding, warp the scheduling problem, avoided the harmfulness that follow-up appearance change produced, improved blade strength and improved the life of impeller.
Drawings
FIG. 1 is a perspective view of a prior art impeller;
FIG. 2 is a schematic perspective view of an embodiment of an impeller according to example 1;
FIG. 3 is a schematic perspective view of another embodiment of the impeller of example 1;
FIG. 4 is a front elevational view of the impeller of FIG. 2;
FIG. 5 is a cross-sectional view B-B of FIG. 4;
FIG. 6 is a bottom view of the impeller of FIG. 2;
FIG. 7 is a top view of the impeller of FIG. 2;
FIG. 8 is a cross-sectional view C-C of FIG. 7;
FIG. 9 is an exploded schematic view of one embodiment of the impeller of example 1;
FIG. 10 is an exploded view of the water pump according to embodiment 2;
wherein: 10-impeller, 11-base, 12-hub, 12.1-first section, 12.2-second section, 12.3-third section, 13-blade, 13.1-blade top, 13.11-top plate, 13.12-arc support rib, 13.1 a-first blade top, 13.1 b-second blade top, 13.2-blade bottom, 13.21-base plate, 13.22-arc support rib, 13.3-blade middle, 13.5-guide groove, 14-part one, 14.1-blade support seat, 14.11-first support plate, 14.12-first connection face, 14.13-second connection face, 14.14-second inner support plate, 15-part two, 15.1-second outer support plate, 16-groove, 17-ridge, 18-pit, 19-bolt, 20-pump cover, 30-pump body.
Detailed Description
Example 1
As shown in fig. 2 to 3, the impeller 10 of the present embodiment includes a base 11, a hub 12 and a plurality of blades 13, the hub 12 is located on the base 11, and includes a first portion 12.1 and a second portion 12.2 which are connected from top to bottom and have the same axis, a lower bottom surface of the second portion 12.2 is greater than an upper bottom surface thereof, the plurality of blades 13 extend radially outward from an outer surface of the hub 12, each blade 13 includes a blade top portion 13.1, a blade middle portion 13.3 and a blade bottom portion 13.2 which are sequentially connected from top to bottom, and a width of the blade top portion 13.1 and a width of the blade bottom portion 13.2 are both greater than a width of the blade middle portion 13.3. The base 11 may be cylindrical (fig. 2) or disc-shaped (fig. 3), and may be of other shapes depending on the specific application of the impeller.
The impeller of the present embodiment has a hub 12 and each blade which are different from conventional hub and blade shapes. When the impeller is applied to a water pump, the first part 12.1 of the impeller is used for being fixed with a rotating shaft of the water pump, and the lower bottom surface of the second part 12.2 is larger than the upper bottom surface thereof, namely the second part 12.2 can be a symmetrical frustum body, a frustum shell or a circular truncated cone body and a circular truncated cone shell; the fluid movement area of the centrifugal water pump is the space in the cavity of the pump cover except for the impeller, and if the pump cover is unchanged, the fluid movement space is reduced due to the hub of the embodiment compared with the traditional hub, so that the pressure in the cavity is increased, and the efficiency of the water pump can be improved; on the other hand, because the specific shape of wheel hub and blade, under the same flow, make the utility model discloses an impeller diameter can accomplish littleer, and the impeller diameter is little and makes the torsional moment that the blade received (the resistance that water gave the impeller) reduce, to the same motor, can improve the low pressure start-up performance of water pump.
As an embodiment, as shown in fig. 4 to 8, the first portion 12.1 may be cylindrical, and the second portion 12.2 may be a circular truncated cone shell. The concrete shape of wheel hub has been injectd to this embodiment, because the surface of wheel hub is the cambered surface, can further reduce because of the energy loss that the fluid impact produced, the improvement of water pump efficiency has also further been guaranteed to the shape of blade simultaneously.
Further, the blade top 13.1 includes a top plate 13.11 and a concave arc-shaped supporting rib 13.12 formed by extending from the top plate 13.11 to the blade middle 13.3, and the blade bottom 13.2 includes a bottom plate 13.21 and a concave arc-shaped supporting rib 13.22 formed by extending from the bottom plate to the blade middle. As an embodiment, as shown in fig. 4 to 8, the hub 12 may further include a third portion 12.3 connected between the second portion 12.2 and the base 11, the third portion 12.3 is cylindrical, and the height of the third portion 12.3 is equal to the thickness of the edge of the bottom plate 13.2, in this embodiment, the third portion 12.3 is a transition portion where the second portion 12.2 is connected with the base 11, and in other embodiments, the third portion 12.3 may not be provided at all, and may be directly connected with the base 11 through the second portion 12.2.
As an embodiment, the blade middle part 13.3 may be plate-shaped, and the cross section of the blade is i-shaped or X-shaped. When no flow guide groove is formed on the top plate 13.1 and the bottom plate 13.2, the cross section of the blade is I-shaped (not shown); when both the top 13.1 and the bottom 13.2 are provided with flow channels, the cross-section of the blade is X-shaped (see fig. 8).
In a preferred embodiment, each of the guiding grooves 13.5 is formed in the blade 13, and each of the guiding grooves 13.5 is formed downward from the top plate 13.11 or upward from the bottom plate 13.21, so that the blade 13 is in a Y-shape in top view or bottom view with its opening facing outward. Through guiding gutter 13.5's setting, water pump efficiency can further improve, and it is very useful to injection moulding's impeller, make the impeller both can material saving and make things convenient for the drawing die when moulding plastics like this on the one hand, on the other hand because the thickness of moulding plastics of blade top and blade bottom reduces, can avoid the blade to produce the blade after injection moulding again and contract, warp the scheduling problem, the harmfulness that follow-up appearance change produced has been avoided, can improve the intensity after the blade shaping and improve the life of impeller. The guiding grooves may be provided only at the top of the blade, only at the bottom of the blade, or at all the tops and bottoms of the blade, or at the top of some blades and/or at the bottom of some blades, and are preferably provided at all the tops and bottoms of the blade (as shown in fig. 2 to 3).
In a preferred embodiment, the top surface of the blade 13 and the bottom surface of the blade 13 are both planes perpendicular to the hub axis, the blade middle part 13.3 is centrally perpendicular to the blade top surface and the blade bottom surface, the cross section of the blade 13 can be symmetrical left and right and up and down, and the thickness of the blade middle part 13.3 is equal to the thickness of the arc-shaped supporting rib 13.12 or 13.21.
As a preferred embodiment, each vane 13 extends in the height direction from the bottom end of the hub 12 upwards, taking the vane height as H2, the height of the second portion 12.2 as H3, 0.75H2 ≦ H3 ≦ H2. The preferred embodiment of H2 and H3 satisfying the above relationship allows the water pump to achieve an optimum head.
As shown in fig. 9, as an embodiment, the impeller 10 is formed by connecting a first part 14 and a plurality of second parts 15, the first part 14 includes a base 11, a hub 12 and a plurality of blade supports 14.1 extending radially outward from the hub 12, the blade supports 14.1 include a blade bottom 13.2 and a first support plate 14.11 connected to the blade bottom 13.2, and the second parts 15 and the blade supports 14.1 are butted one to form the blades 13. The impeller with the structure can be manufactured by respectively injection molding the first part and the second part, assembling and connecting the second part and the first part, and bonding and fixing the two parts by an adhesive; on the other hand, the impeller is formed by connecting two detachable parts, so that the purpose of changing the control range of the flow and the efficiency can be conveniently achieved by selecting the size parameters of different parts II. As a specific embodiment, the blade support base 14.1 further includes a first blade tip portion 13.1a and a second inner support plate 14.14 supported below the first blade tip portion 13.1a, the blade support base 14.1 has a first connection surface 14.12 facing the radial outer direction of the hub and a second connection surface 14.13 facing upward of the first support plate 14.11, the component two 15 includes a second blade tip portion 13.1b and a second outer support plate 15.1 supported below the second blade tip portion 13.1b, each second blade tip portion 13.1b and each first blade tip portion 13.1a are radially engaged to form the blade tip portion 13.1, and the second outer support plate 15.1 is respectively engaged with the first support plate 14.11 up and down and engaged with the second inner support plate 14.14 to form the blade middle portion 13.3. Specifically, a plurality of pairs of bolts and recesses which are matched with each other are arranged on the surfaces which are embedded with each other, for example, a groove 16 is arranged on the blade supporting seat 14.1, a rib 17 is arranged on the first connecting surface 14.12, a plurality of pairs of bolts 19 and recesses 18 which are matched with each other are arranged on the bottom surface of the second supporting outer plate 15.1 of the second part 15 and the second connecting surface 14.12, so that the second part 15 and the first part 14 are fixed, of course, the rib 17 and the groove 16 can be respectively arranged, then the bolt 19 is arranged on the rib, and the recess 18 is arranged on the groove. In other embodiments, however, other means of engagement are also possible.
Example 2
As shown in fig. 10, the water pump of the present embodiment includes the impeller 10 of embodiment 1, and further includes a pump cover 20 and a pump body 30.
As shown in table 1 below, under the condition that other conditions are not changed, when the blade in the prior art is changed into the blade in this embodiment 1 with the X-shaped cross section and the hub is changed into the first partial cylindrical shape and the second partial circular truncated cone shell shape in this embodiment 1, the performance parameters of the water pump in terms of flow rate and efficiency are shown, and the efficiency of the water pump can be improved by 21.7% compared with the impeller in the prior art. In table 1, W is the lateral width of the blade top plate, R is the arc radius of the arc-shaped support rib, H1 is the edge thickness of the blade top plate, and H2 is the blade height.
TABLE 1
In other embodiments, the water pump can be adjusted by W, R, H1, H2 and other parameters, so that the water pump meets different flow and efficiency requirements.
As shown in table 2 below, when the blade in the prior art is changed into the blade in this embodiment 1, the cross section of which is in an X shape, and the hub is changed into the first cylindrical part and the second circular truncated cone shell shape in this embodiment 1, under the condition of the same flow rate, the motor and the electromagnetic force thereof are kept unchanged, and a low-voltage starting test is performed, and it is found that the low-voltage starting response time of the new impeller is shorter than the original low-voltage starting response time, and the low-voltage starting performance is better.
TABLE 2
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. An impeller, characterized by: including base, wheel hub and a plurality of blade, wheel hub is located on the base, including the first portion and the second portion that from top to bottom link to each other and the coaxial line, the lower bottom surface of second portion is greater than its upper bottom surface, a plurality of blades are from the outside radial extension of wheel hub's surface, and each blade includes from last blade top, blade middle part and the blade bottom that connects gradually down, and the width at blade top and the width of blade bottom all are greater than the width at blade middle part.
2. The impeller of claim 1, wherein: the first part is cylindrical, and the second part is in a circular truncated cone shell shape.
3. The impeller of claim 2, wherein: the blade top comprises a top plate and a concave arc-shaped supporting rib formed by extending from the top plate to the middle of the blade, and the blade bottom comprises a bottom plate and a concave arc-shaped supporting rib formed by extending from the bottom plate to the middle of the blade.
4. The impeller of claim 3, wherein: the middle part of the blade is in a flat plate shape, and the cross section of the blade is in an I shape or an X shape.
5. The impeller of claim 4, wherein: the blade is also provided with a plurality of flow guide grooves, and each flow guide groove is downwards arranged from the top plate or upwards arranged from the bottom plate, so that the blade is in a Y shape when overlooking or looking up and the opening of the blade faces outwards.
6. The impeller of claim 5, wherein: the top surface of blade and the bottom surface of blade are the plane of perpendicular to wheel hub axis, blade middle part ground perpendicular to blade top surface and blade bottom surface in the middle of, the cross section of blade is left and right sides, longitudinal symmetry, the thickness in blade middle part with arc supports rib thickness and equals.
7. The impeller of claim 4, wherein: each blade extends upwards from the bottom end of the hub in the height direction, and the height of the blade is recorded as H2, the height of the second part is recorded as H3, and the height of the second part is 0.75H 2-H3-H2.
8. The impeller according to any one of claims 3 to 7, wherein: the impeller is formed by connecting part one and a plurality of part two, part one includes base, wheel hub and follow a plurality of blade supporting seats of the outside radial extension of wheel hub, the blade supporting seat include the blade bottom with connect in first backup pad above the blade bottom, part two with the butt joint of blade supporting seat one-to-one constitutes jointly the blade.
9. The impeller of claim 8, wherein: the blade supporting seat further comprises a first blade top and a second inner supporting plate supported below the first blade top, the blade supporting seat is provided with a first connecting surface facing to the radial outer side direction of the hub and is located, the first supporting plate is connected with the second connecting surface facing to the upper side, the component two comprises a second blade top and a second outer supporting plate supported below the second blade top, each second blade top and each first blade top are radially embedded and formed in the blade top, the second outer supporting plate is respectively embedded and formed with the first supporting plate in a vertical embedding mode and the second inner supporting plate in a radial embedding mode, and the middle of the blade is formed in the second inner supporting plate in a vertical embedding mode.
10. A water pump comprising an impeller according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920690308.1U CN210068551U (en) | 2019-05-14 | 2019-05-14 | Impeller and water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920690308.1U CN210068551U (en) | 2019-05-14 | 2019-05-14 | Impeller and water pump |
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| Publication Number | Publication Date |
|---|---|
| CN210068551U true CN210068551U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920690308.1U Withdrawn - After Issue CN210068551U (en) | 2019-05-14 | 2019-05-14 | Impeller and water pump |
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| CN (1) | CN210068551U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056534A (en) * | 2019-05-14 | 2019-07-26 | 汉宇集团股份有限公司 | A kind of impeller and water pump |
-
2019
- 2019-05-14 CN CN201920690308.1U patent/CN210068551U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056534A (en) * | 2019-05-14 | 2019-07-26 | 汉宇集团股份有限公司 | A kind of impeller and water pump |
| CN110056534B (en) * | 2019-05-14 | 2024-03-26 | 汉宇集团股份有限公司 | Impeller and water pump |
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