Impeller, drainage pump and refrigeration equipment

Abstract

The utility model discloses an impeller, a drainage pump and refrigeration equipment, and relates to the technical field of drainage pumps. Wherein the impeller comprises an impeller shaft and a plurality of blades, the blades are distributed on the periphery of the impeller shaft at intervals, and the blades extend in the radial direction of the impeller shaft; the blade is provided with a first end close to the impeller shaft and a second end away from the impeller shaft, and in the axial direction of the impeller shaft, the height of the upper end face of the blade at the first end is larger than that of the blade at the second end. According to the technical scheme, the working efficiency of the drainage pump at high lift can be guaranteed, and meanwhile noise generated when the drainage pump works at low lift can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of drainage pumps, and particularly relates to an impeller, a drainage pump and a refrigeration device. Background Art

[0002] When a refrigeration device such as an air conditioner is operating, condensed water is generated. The condensed water accumulates in a water receiving tray and is discharged through a drainage pump. The impeller is an important component of the drainage pump. When working, the impeller is driven by a motor to rotate to generate negative pressure, suck water into the impeller, and then discharge the water through the action of centrifugal force.

[0003] In the related art, the upper end surface of the impeller blade is a straight plane. When the radius is fixed, to ensure high head performance, the blade height needs to be increased. However, this will cause a large interaction area between the blade and water vapor at low head, resulting in greater noise. If the blade height is reduced to reduce the interaction area between the blade and water vapor at low head to reduce noise, the high head performance cannot be guaranteed, and the drainage efficiency is low. Summary of the Utility Model

[0004] The main object of the utility model is to propose an impeller, aiming to ensure the working efficiency of the drainage pump at high head, and at the same time reduce the noise during low head operation.

[0005] To achieve the above object, the impeller proposed by the utility model includes:

[0006] An impeller shaft; and

[0007] A plurality of blades, spaced apart and distributed on the outer periphery of the impeller shaft, and the blades extend along the radial direction of the impeller shaft;

[0008] The blade has a first end close to the impeller shaft and a second end far from the impeller shaft. In the axial direction of the impeller shaft, the height of the upper end surface of the blade at the first end is higher than that at the second end.

[0009] In an embodiment of the present application, the upper end surface of the blade is inclined downward from the first end to the second end.

[0010] In an embodiment of the present application, the plurality of blades include a number of first blades, and the first blades are fixedly connected to the outer periphery of the impeller shaft and extend radially outward along the impeller shaft;

[0011] The included angle α between the upper end surface of the first blade and the central axis of the impeller shaft satisfies: 30° ≤ α < 90°.

[0012] In an embodiment of the present application, the impeller further includes a water storage tray, the water storage tray is provided with a central through hole, and the impeller shaft passes through the central through hole;

[0013] A plurality of the blades are arranged on the water storage tray.

[0014] In an embodiment of the present application, the plurality of the blades further include a plurality of second blades arranged on the water storage tray, the second blades are arranged at intervals with respect to the impeller shaft and extend along the radial direction of the impeller shaft;

[0015] One of the second blades is arranged between two adjacent first blades.

[0016] In an embodiment of the present application, the included angle β between the upper end surface of the second blade and the central axis of the impeller shaft satisfies: 40° ≤ β < 90°.

[0017] In an embodiment of the present application, on the same circumference centered on the central axis of the impeller shaft, the height of the upper end surface of the second blade is not higher than the height of the upper end surface of the first blade.

[0018] In an embodiment of the present application, the distance d1 between the first end of the upper end surface of the first blade and the second end of the lower end surface of the first blade in the axial direction of the impeller shaft satisfies: 2 mm < d1 ≤ 15 mm.

[0019] In an embodiment of the present application, the distance d2 between the first end of the upper end surface of the second blade and the second end of the lower end surface of the second blade in the axial direction of the impeller shaft satisfies: 1 mm < d2 ≤ 12 mm.

[0020] In an embodiment of the present application, the upper end surface of the first blade extends obliquely to be connected to the upper surface of the water storage tray;

[0021] And / or, the upper end surface of the second blade extends obliquely to be connected to the upper surface of the water storage tray.

[0022] In an embodiment of the present application, there is a spacing between the upper end surface of the first blade at the second end and the upper surface of the water storage tray;

[0023] And / or, there is a spacing between the upper end surface of the second blade at the second end and the upper surface of the water storage tray.

[0024] To achieve the above object, the present application further provides a drainage pump, including a motor and the above-mentioned impeller, and the motor is drivingly connected to the impeller shaft.

[0025] To achieve the above object, the present application further provides a refrigeration device, including the above-mentioned drainage pump.

[0026] In the technical solution of the impeller of the present utility model, a plurality of blades are distributed at intervals on the outer periphery of the impeller shaft, and the blades extend radially along the impeller shaft, so that the rotation of the impeller shaft can drive the plurality of blades to rotate to achieve the functions of water absorption and drainage. The blade has a first end close to the impeller shaft and a second end far from the impeller shaft. By setting the height of the upper end surface of the blade at the first end higher than the height of the upper end surface of the blade at the second end in the axial direction of the impeller shaft, when the drainage pump works at a high head, it can ensure a sufficiently large working area of the blade, and when it works at a low head, it can reduce the area of interaction between the blade and water vapor and reduce noise. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the structures shown in these drawings.

[0028] Figure 1 Front view of an embodiment of the impeller of the present utility model;

[0029] Figure 2 For Figure 1 Top view;

[0030] Figure 3 Structural schematic diagram of an embodiment of the impeller of the present utility model;

[0031] Figure 4 For Figure 3 Cross-sectional view taken along the midline of the first blade in the embodiment;

[0032] Figure 5 For Figure 3 Cross-sectional view taken along the midline of the second blade in the embodiment;

[0033] Figure 6 Structural schematic diagram of another embodiment of the impeller of the present utility model;

[0034] Figure 7 For Figure 6 Cross-sectional view taken along the midline of the first blade in the embodiment;

[0035] Figure 8 For Figure 6 Cross-sectional view taken along the midline of the second blade in the embodiment.

[0036] Explanation of the reference numerals in the drawings:

[0037]

[0038]

[0039] The realization, functional features and advantages of the present utility model will be further described in conjunction with embodiments and with reference to the accompanying drawings. Specific embodiments

[0040] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0041] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, then the directional indications will also change accordingly.

[0042] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes the scenario of A, or the scenario of B, or the scenario where A and B are satisfied simultaneously.

[0043] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, then such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0044] Due to considerations such as its structure, the inside of the drainage pump is in a two-phase state where both gas and water exist, and there is a relatively obvious demarcation line between water and gas. The position near the central axis in the impeller is air, and the position with a larger radius is water. At high head, the head pressure at the pump outlet is relatively high, and the water-gas interface will be at a position with a relatively small impeller radius; at low head, the head pressure at the pump outlet is relatively low, and the water-gas interface will be at a position with a larger impeller radius or at the blade tip position.

[0045] In the impellers in the related art, when ensuring the drainage performance at high lift, the noise at low lift is relatively high; when reducing the noise at low lift, the drainage performance at high lift is affected.

[0046] For this reason, the present utility model provides an impeller 100, aiming to improve the structure of the blades 120 to achieve both ensuring the working efficiency of the drainage pump at high lift and reducing the noise at low lift. It can be understood that the drainage pump includes a casing, a motor and an impeller. The casing is provided with a water inlet and a water outlet. The impeller is located inside the casing. The rotation of the impeller driven by the motor generates negative pressure to suck water from the water inlet and discharge it from the water outlet. Hereinafter, taking the axial direction of the impeller as the up and down direction as an example, the structure of the impeller will be described by way of embodiments.

[0047] As Figures 1 to 5 shown, the impeller 100 includes an impeller shaft 110 and a plurality of blades 120. The plurality of blades 120 are spaced apart and distributed on the outer periphery of the impeller shaft 110. The blades 120 extend along the radial direction of the impeller shaft 110; the blades 120 have a first end 120a close to the impeller shaft 110 and a second end 120b far from the impeller shaft 110. In the axial direction of the impeller shaft 110, the height of the upper end surface of the blade 120 at the first end 120a is higher than its height at the second end 120b.

[0048] The impeller shaft 110 is used for driving connection with the motor in the drainage pump to play a role in transmission. The motor drives the impeller shaft 110 to rotate, driving the plurality of blades 120 to rotate to achieve the functions of water absorption and drainage. Optionally, the impeller shaft 110 can be a solid shaft or a hollow shaft, as long as it can be drivingly connected with the motor shaft of the motor.

[0049] The plurality of blades 120 are spaced apart and distributed on the outer periphery of the impeller shaft 110. It can be understood that the blades 120 can be directly connected to the impeller shaft 110 or indirectly connected to the impeller shaft 110, as long as the rotation of the impeller shaft 110 can drive the plurality of blades 120 to rotate. The specific structure of the blades 120 can be determined according to the actual situation. For example, it can be a straight blade, a spiral blade or an inclined blade, etc.

[0050] In actual application, as Figure 4, inside the drainage pump, it is in a two-phase state with both gas and water existing, and there is a relatively obvious boundary between water and gas. The position near the central axis in the impeller 100 is air, and the position with a larger radius is water. The drainage pump has a high-lift working condition and a low-lift working condition. In the high-lift working condition, the drainage pump can transport water to a higher position. At this time, the pressure at the outlet of the drainage pump is relatively high, and the pressure of the external water is much higher than the pressure of the air in the middle. Then, the water-gas interface will be at a position with a relatively small radius of the impeller 100. While in the low-lift working condition, the drainage pump transports water to a lower position. At this time, the pressure at the outlet of the drainage pump decreases, and the pressure of the external water decreases. Then, the water-gas interface will be at a position with a larger radius of the impeller 100 or at the position of the blade tip. It can be seen that when the drainage pump is at high lift, the load is larger, and the blade 120 needs to do more work, so the area where the blade 120 contacts water needs to be larger. When the drainage pump is at low lift, the load is smaller, and the blade 120 needs to do relatively less work, so the requirement for the area where the blade 120 contacts water is relatively not high. However, in this working condition, if the area where the blade 120 interacts with water and gas is larger, it will cause relatively large noise. Based on this, in this embodiment, the blade 120 has a first end 120a close to the impeller shaft 110 and a second end 120b far from the impeller shaft 110. By setting the height of the upper end surface of the blade 120 at the first end 120a to be higher than the height of the upper end surface of the blade 120 at the second end 120b in the axial direction of the impeller shaft 110, the area where the blade 120 near the impeller shaft 110 interacts with water and gas will be larger than the area where the blade 120 far from the impeller shaft 11 interacts with water and gas. Thus, when the drainage pump is working at high lift, it can ensure that the blade 120 has a sufficient working area, and when it is working at low lift, it can reduce the area where the blade 120 interacts with water and gas and reduce noise.

[0051] It should be noted that the height of the upper end surface of the blade 120 in this embodiment at the first end 120a is higher than its height at the second end 120b. This is compared with the upper end surface of the blade 120 being a straight plane under the same conditions (such as the same blade length, the same lower end surface of the blade, etc.). On the one hand, it can ensure the height requirement of the blade 120 at high lift, and on the other hand, it can reduce the height of the blade 120 at the position where it interacts with water and gas at low lift. Thus, it can not only ensure the working efficiency at high lift but also reduce the noise at low lift.

[0052] The height of the upper end surface of the blade 120 at the first end 120a is higher than its height at the second end 120b. It can be understood that the upper end surface of the blade 120 can be a continuous surface such as an inclined plane, an arc surface, or a wavy surface, etc.; or it can also be a non-continuous surface such as a trapezoidal surface or a stepped surface, etc.

[0053] In summary, in the technical solution of the present utility model for the impeller 100, a plurality of blades 120 are spaced apart and distributed on the outer periphery of the impeller shaft 110. The blades 120 extend radially along the impeller shaft 110, such that the rotation of the impeller shaft 110 can drive the rotation of the plurality of blades 120 to achieve the functions of water absorption and drainage. The blade 120 has a first end 120a close to the impeller shaft 110 and a second end 120b far from the impeller shaft 110. By setting the height of the upper end surface of the blade 120 at the first end 120a to be higher than the height of the upper end surface of the blade 120 at the second end 120b in the axial direction of the impeller shaft 110, when the drainage pump operates at a high head, it can ensure a sufficiently large working area for the blade 120, and when operating at a low head, it can reduce the area of interaction between the blade 120 and water vapor, thereby reducing noise.

[0054] In an embodiment of the present application, as Figure 1 , Figure 3 and Figure 6 , the upper end surface of the blade 120 is inclined downward from the first end 120a to the second end 120b.

[0055] In this embodiment, the upper end surface of the blade 120 is an inclined plane, such that the upper end surface of the blade 120 smoothly transitions from the first end 120a to the second end 120b, which can avoid the uneven work done on the water flow caused by the sudden change of the blade 120, more effectively guide the water flow during the rotation of the impeller 100, reduce the frictional loss of the fluid inside the impeller 100, and thus improve the overall drainage efficiency.

[0056] In addition, such a setting also helps to improve the dynamic balance of the impeller 100, reduce the vibration and noise caused by the imbalance of the impeller 100, and improve the overall operating performance of the drainage pump.

[0057] In an embodiment of the present application, as Figures 1 to 4 and Figure 7 , the plurality of blades 120 include a number of first blades 121. The first blades 121 are fixedly connected to the outer periphery of the impeller shaft 110 and extend radially outward along the impeller shaft 110. The angle α between the upper end surface of the first blade 121 and the central axis of the impeller shaft 110 satisfies: 30° ≤ α < 90°.

[0058] In this embodiment, the plurality of blades 120 include a number of first blades 121, which are directly fixedly connected to the outer periphery of the impeller shaft 110 and extend radially outward along the impeller shaft 110. It can be understood that the first blade 121 can be equivalent to the long blade (main blade) of the impeller in the related art, which can enable the impeller 100 to more effectively capture and drain the water flow during the rotation process, and improve the overall working efficiency of the drainage pump.

[0059] It can be understood that the angle α between the upper end surface of the first blade 121 and the central axis of the impeller shaft 110 should neither be too small nor too large. If it is too large, the upper end surface of the first blade 121 tends to be horizontal or even inclined in the reverse direction, which may not achieve the purpose of reducing noise at low lift; if it is too small, the upper end surface of the first blade 121 is inclined too much, which will result in a smaller working area of the first blade 121 and affect the drainage efficiency. Based on this, in this embodiment, the angle α between the upper end surface of the first blade 121 and the central axis of the impeller shaft 110 is set to satisfy: 30° ≤ α < 90°, which can not only ensure the drainage efficiency but also reduce the noise under low-lift conditions. In addition, such a setting helps to optimize the direction and velocity of the water flow, reduce the turbulence and eddy current of the water flow inside the impeller 100, make the water flow smoother, and thus reduce the energy loss of the water flow.

[0060] Optionally, the angle α between the upper end surface of the first blade 121 and the central axis of the impeller shaft 110 can be selected as 30°, 40°, 45°, 50°, 60°, 63°, 70°, 75°, 80°, 83° or 89°, etc.

[0061] Furthermore, as Figures 1 to 3 , the impeller 100 further includes a water storage tray 130. The water storage tray 130 is provided with a central through hole 131, and the impeller shaft 110 passes through the central through hole 131; a plurality of blades 120 are arranged on the water storage tray 130.

[0062] In this embodiment, on the one hand, the water storage tray 130 can play a role in supporting and installing a plurality of blades 120, and on the other hand, it can play a role in guiding and collecting water during the operation of the impeller 100, so that the water can be sucked into the upper part of the water storage tray 130 from the central through hole 131, and then the water is discharged from the circumferential drainage port by the centrifugal force generated by the rotation of the plurality of blades 120.

[0063] In one embodiment, the water storage tray 130 includes a tray body 132 and a surrounding edge 133. The central through hole 131 is provided at the center of the tray body 132, and the surrounding edge 132 surrounds the periphery of the tray body 132. Optionally, the tray body 132 has a conical structure, and the upper surface of the tray body 132 can play a role in guiding the water flow. A plurality of blades 120 are arranged on the tray body 132 and are spaced apart along the center of the tray body 132. The impeller shaft 110 is arranged at the central through hole 131, and the first blade 121 is fixedly connected to the tray body 132.

[0064] In order to further improve the drainage efficiency, as Figure 2 、 Figure 3 and Figure 6 , the plurality of blades 120 further include a number of second blades 122 arranged on the water storage tray 130. The second blades 122 are spaced from the impeller shaft 110 and extend along the radial direction of the impeller shaft 110; one second blade 122 is arranged between two adjacent first blades 121.

[0065] In this embodiment, the second blade 122 can be equivalent to the short blade (auxiliary blade) of the impeller in the related art, playing an auxiliary role in the drainage work. Compared with only setting the first blade 121, the drainage efficiency is further improved.

[0066] By arranging one second blade 122 between two adjacent first blades 121, multiple second blades 122 are more evenly distributed in the circumferential direction, which helps to improve the dynamic balance of the impeller 100, reduce vibration and noise caused by the imbalance of the impeller 100, and improve the overall operating performance of the drainage pump.

[0067] In one embodiment, as Figure 5 and Figure 8 , the included angle β between the upper end face of the second blade 122 and the central axis of the impeller shaft 110 satisfies: 40° ≤ β < 90°.

[0068] It can be understood that the included angle β between the upper end face of the second blade 122 and the central axis of the impeller shaft 110 should not be too small or too large. If it is too large, the upper end face of the second blade 122 tends to be horizontal or even reversely inclined, which may not achieve the purpose of reducing noise at low lift; if it is too small, the upper end face of the second blade 122 is inclined too much, which will result in a smaller working area of the second blade 122 and affect the drainage efficiency. Based on this, in this embodiment, by setting the included angle β between the upper end face of the second blade 122 and the central axis of the impeller shaft 110 to satisfy: 40° ≤ β < 90°, it can not only ensure the drainage efficiency but also reduce the noise under low-lift conditions. In addition, such a setting helps to optimize the direction and velocity of the water flow, reduce the turbulence and eddy current of the water flow inside the impeller 100, make the water flow smoother, and thus reduce the energy loss of the water flow.

[0069] Optionally, the included angle β between the upper end face of the second blade 122 and the central axis of the impeller shaft 110 can be selected as 40°, 45°, 50°, 60°, 63°, 70°, 75°, 80°, 83° or 89°, etc.

[0070] In order to further reduce noise, in one embodiment of the present application, as Figure 4 , Figure 5 , Figure 7 and Figure 8 , on the same circumference centered on the central axis of the impeller shaft 110, the height of the upper end face of the second blade 122 is not higher than the height of the upper end face of the first blade 121.

[0071] In this embodiment, the first blade 121 extends radially outward from the circumferential wall of the impeller shaft 110, while the second blade 122 is arranged at an interval from the impeller shaft 110. Then, the first blade 121 functions as the main blade, and the second blade 122 functions as the auxiliary blade. By making the height of the upper end surface of the second blade 122 not higher than that of the upper end surface of the first blade 121 on the same circumference centered on the central axis of the impeller shaft 110, the second blade 122 can be blocked by the first blade 121 axially, avoiding the situation where the second blade 122 protrudes from the first blade 121 and causing uneven water pressure in the circumferential direction to generate noise. Thus, the operating noise of the drainage pump can be reduced.

[0072] Among them, on the same circumference centered on the central axis of the impeller shaft 110, it can be understood as the blade 120 at the position of the same radius centered on the central axis of the impeller shaft 110.

[0073] In an embodiment of the present application, as Figure 5 , the distance d1 between the first end 120a of the upper end surface of the first blade 121 and the second end 120b of the lower end surface of the first blade 121 in the axial direction of the impeller shaft 110 satisfies: 2 mm < d1 ≤ 15 mm.

[0074] It can be understood that the height of the first blade 121 at the position close to the impeller shaft 110 should not be too large or too small. If it is too small, the work capacity is weak, resulting in low drainage efficiency; if it is too large, the overall volume of the impeller 100 will be too large, and the cost will also increase. Based on this, in this embodiment, by setting the distance d1 between the first end 120a of the upper end surface of the first blade 121 and the second end 120b of the lower end surface of the first blade 121 in the axial direction of the impeller shaft 110 to satisfy: 2 mm < d1 ≤ 15 mm, in this way, both the drainage efficiency can be ensured and the volume can be prevented from being too large.

[0075] It should be noted that in this embodiment, the distance d1 between the first end 120a of the upper end surface of the first blade 121 and the second end 120b of the lower end surface of the first blade 121 in the axial direction of the impeller shaft 110 is used to characterize the height at the first end 120a of the first blade 121. The purpose is to facilitate the measurement operation, that is, to measure based on the bottom surface of the outer end (the second end 120b) of the first blade 121. Compared with the method of using other parts as the reference, the operation is more convenient.

[0076] Optionally, the distance d1 between the first end 120a of the upper end face of the first blade 121 and the second end 120b of the lower end face of the first blade 121 in the axial direction of the impeller shaft 110 can be optionally 2.5 mm, 3 mm, 3.3 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm, 10.5 mm, 11 mm, 12 mm, 12.5 mm, 13 mm, 14 mm, 14.5 mm or 15 mm, etc.

[0077] In an embodiment of the present application, as Figure 5 , the distance between the first end 120a of the upper end face of the second blade 122 and the second end 120b of the lower end face of the second blade 122 in the axial direction of the impeller shaft 110 is d2, satisfying: 1 mm < d2 ≤ 12 mm.

[0078] It can be understood that the height of the second blade 122 at the position close to the impeller shaft 110 should not be too large or too small. If it is too small, the work capacity is weak, resulting in low drainage efficiency; if it is too large, the overall volume of the impeller 100 will be too large and the cost will also increase. Based on this, in this embodiment, by setting the distance d2 between the first end 120a of the upper end face of the second blade 122 and the second end 120b of the lower end face of the second blade 122 in the axial direction of the impeller shaft 110 to satisfy: 2 mm < d2 ≤ 15 mm, in this way, both the drainage efficiency can be ensured and the volume can be prevented from being too large.

[0079] It should be noted that in this embodiment, the distance d2 between the first end 120a of the upper end face of the second blade 122 and the second end 120b of the lower end face of the second blade 122 in the axial direction of the impeller shaft 110 is used to characterize the height at the first end 120a of the second blade 122. The purpose is to facilitate the measurement operation, that is, to measure with the bottom surface of the outer end (second end 120b) of the second blade 122 as the reference. Compared with the method using other parts as the reference, the operation is more convenient.

[0080] Optionally, the distance d2 between the first end 120a of the upper end face of the second blade 122 and the second end 120b of the lower end face of the second blade 122 in the axial direction of the impeller shaft 110 can be optionally 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.3 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 10 mm, 10.5 mm, 11 mm or 12 mm, etc.

[0081] In actual application, the specific shape of the blade 120 can be determined according to the actual situation.

[0082] Optionally, the cross-sectional shape of the blade 120 can be triangular.

[0083] In one embodiment, as Figure 6 and Figure 7 , the upper end surface of the first blade 121 extends obliquely to connect with the upper surface of the water storage tray 130. With this arrangement, the cross-sectional shape of the first blade 121 is triangular, and the upper end surface of the first blade 121 directly extends obliquely to the upper surface of the disk body 132, which can further reduce the interaction area between the first blade 121 and the water and gas at low lift, effectively reducing noise.

[0084] In one embodiment, as Figure 6 and Figure 8 , the upper end surface of the second blade 122 extends obliquely to connect with the upper surface of the water storage tray 130. With this arrangement, the cross-sectional shape of the second blade 122 is triangular, and the upper end surface of the second blade 122 directly extends obliquely to the upper surface of the disk body 132, which can further reduce the interaction area between the second blade 122 and the water and gas at low lift, effectively reducing noise.

[0085] Optionally, the cross-sectional shape of the blade 120 can be trapezoidal.

[0086] In one embodiment, as Figure 3 and Figure 4 , the upper end surface of the first blade 121 has a spacing from the upper surface of the water storage tray 130 at the second end 120b. With this arrangement, the cross-sectional shape of the first blade 121 is trapezoidal, which can effectively ensure the work capacity of the first blade 121 when the drainage pump is working and improve the drainage efficiency.

[0087] In one embodiment, as Figure 3 and Figure 5 , the upper end surface of the second blade 122 has a spacing from the upper surface of the water storage tray 130 at the second end 120b. With this arrangement, the cross-sectional shape of the second blade 122 is trapezoidal, which can effectively ensure the work capacity of the second blade 122 when the drainage pump is working and improve the drainage efficiency.

[0088] The present utility model also provides a drainage pump, which includes a motor and an impeller 100. The specific structure of the impeller 100 refers to the above embodiments. Since this drainage pump adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. Among them, the motor is drivingly connected to the impeller shaft 110.

[0089] The present utility model further provides a refrigeration device, which includes a drainage pump. The specific structure of the drainage pump refers to the above-mentioned embodiments. Since this refrigeration device adopts all the technical solutions of the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated one by one here. Optionally, the refrigeration device includes an air conditioner, a refrigerator, a cold chain transport vehicle, etc.

[0090] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. An impeller, characterized in that, Comprising: An impeller shaft; And A plurality of blades, which are spaced apart and distributed on the outer periphery of the impeller shaft, and the blades extend radially along the impeller shaft; The blade has a first end close to the impeller shaft and a second end far from the impeller shaft. In the axial direction of the impeller shaft, the height of the upper end surface of the blade at the first end is higher than its height at the second end.

2. The impeller according to claim 1, wherein The upper end surface of the blade is inclined downward from the first end to the second end.

3. The impeller according to claim 2, wherein, The plurality of blades include a number of first blades, and the first blades are fixedly connected to the outer periphery of the impeller shaft and extend radially outward along the impeller shaft; The included angle α between the upper end surface of the first blade and the central axis of the impeller shaft satisfies: 30° ≤ α < 90°.

4. The impeller according to claim 3, characterized in that, The impeller further includes a water storage tray, and the water storage tray is provided with a central through hole, and the impeller shaft passes through the central through hole; The plurality of blades are arranged on the water storage tray.

5. The impeller according to claim 4, wherein The plurality of blades further include a number of second blades arranged on the water storage tray. The second blades are arranged at intervals with the impeller shaft and extend radially along the impeller shaft; One second blade is arranged between two adjacent first blades.

6. The impeller according to claim 5, characterized in that, The included angle β between the upper end surface of the second blade and the central axis of the impeller shaft satisfies: 40° ≤ β < 90°.

7. The impeller according to claim 5, wherein On the same circumference centered on the central axis of the impeller shaft, the height of the upper end surface of the second blade is not higher than the height of the upper end surface of the first blade.

8. The impeller according to any one of claims 3 to 7, characterized in that, The distance d1 between the first end of the upper end surface of the first blade and the second end of the lower end surface of the first blade in the axial direction of the impeller shaft satisfies: 2 mm < d1 ≤ 15 mm.

9. The impeller according to any one of claims 5 to 7, characterized in that, The distance d2 between the first end of the upper end surface of the second blade and the second end of the lower end surface of the second blade in the axial direction of the impeller shaft satisfies: 1 mm < d2 ≤ 12 mm.

10. The impeller according to any one of claims 5 to 7, characterized in that, The upper end surface of the first blade extends obliquely to be connected with the upper surface of the water storage tray; And / or, the upper end surface of the second blade extends obliquely to be connected with the upper surface of the water storage tray.

11. The impeller according to any one of claims 5 to 7, characterized in that, The upper end surface of the first blade has a spacing from the upper surface of the water storage tray at the second end; And / or, the upper end surface of the second blade has a spacing from the upper surface of the water storage tray at the second end.

12. A drainage pump, characterized in that, Comprising a motor and an impeller as described in any one of claims 1 to 11, and the motor is drivingly connected to the impeller shaft.

13. A refrigeration device, characterized in that, Comprising a drainage pump as described in claim 12.

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