A sand filtering device and a water pump

Abstract

This application relates to a sand filtering device and a water pump, belonging to the technical field of water pumps. It includes an outer cylinder and a filtering mechanism arranged inside the outer cylinder. The filtering mechanism includes an inner cylinder, on which an annular flow channel is provided. A sand discharge channel is opened on the annular flow channel. The inner cylinder and the outer cylinder form a sand storage cavity, and the sand discharge channel is communicated with the sand storage cavity. This application has the advantage of being able to reduce the sand content entering the water pump impeller.

Description

Technical Field

[0001] The present application relates to the technical field of water pumps, and more particularly to a sand filtering device and a water pump. Background Art

[0002] During the use of water pumps, especially well pumps, sand and other substances in the environment often enter the working components. During the high-speed rotation of the impeller, the sand rotates at high speed with the water flow and is prone to cutting and causing wear or even abrasion of the working components, resulting in a decline in the performance or damage of the water pump. Summary of the Invention

[0003] In view of the deficiencies of the prior art, one of the purposes of the present application is to provide a sand filtering device and a water pump, which have the advantage of being able to reduce the sand content entering the impeller of the water pump.

[0004] The above object of the present application is achieved through the following technical solutions:

[0005] A sand filtering device includes a filtering mechanism. The filtering mechanism includes an inner cylinder. An annular flow channel is provided on the inner cylinder. The annular flow channel includes a plurality of spiral grooves. The plurality of spiral grooves are connected in sequence to form a spiral shape. A sand discharge channel is provided in the annular flow channel. The sand discharge channel is located at the axial contact of adjacent spiral grooves or below the groove wall of the spiral groove near the axial contact of two spiral grooves.

[0006] By adopting the above technical solution, during use, water enters the inner cylinder and realizes annular flow through the annular flow channel. During the annular flow process, under the action of centrifugal force, sand and other impurities will gather and be discharged through the sand discharge channel, thereby achieving the purpose of reducing the sand content entering the impeller of the water pump.

[0007] In a preferred example of the present application, it can be further configured that: the inner cylinder includes a support cylinder and a filtering part. The filtering part is located outside the support cylinder and is connected to the support cylinder to form an annular flow channel. The support cylinder is provided with a flow-through hole communicating with the annular flow channel. The sand discharge channel communicates with the annular flow channel.

[0008] By adopting the above technical solution, that is, during use, the liquid enters the annular flow channel through the flow-through hole and flows in the annular flow channel.

[0009] In a preferred example of the present application, it can be further configured that: there is at least one annular flow channel.

[0010] By adopting the above technical solution, by setting the number of annular flow channels, more water flow can enter the annular flow channel, and the lead is larger. The climbing resistance of the water flow increases, so that the sediment is more easily separated from the water flow.

[0011] In a preferred embodiment, the present application can be further configured as follows: it further includes an outer cylinder, the filtering mechanism is disposed inside the outer cylinder, and a sand storage cavity is formed between the outer cylinder and the inner cylinder.

[0012] By adopting the above technical solution, the existence of the sand storage cavity can aggregate the filtered sediment.

[0013] In a preferred embodiment, the present application can be further configured as follows: the spiral groove includes a sand-retaining groove, the sand-retaining groove is located on the side of the annular flow channel away from the support cylinder, the sand-retaining groove is communicated with the sand discharge channel, and the sand-retaining groove is the lowest end of the spiral groove.

[0014] By adopting the above technical solution, the existence of the sand-retaining groove at the lowest end can reduce the probability of sediment re-entering the water flow under the action of the water flow.

[0015] In a preferred embodiment, the present application can be further configured as follows: the filtering part includes a plurality of connected spirals, the spiral includes a connecting body and a contact member, the contact member is connected to the connecting body, and a contact member and a connecting member of another spiral form a sand discharge channel.

[0016] By adopting the above technical solution, the sand discharge channel is located lower, making it easier to discharge sediment.

[0017] In a preferred embodiment, the present application can be further configured as follows: it further includes a pressurizing mechanism, the pressurizing mechanism is disposed at the water inlet end and / or the water outlet end of the outer cylinder, and the pressurizing mechanism includes a rotating shaft and a pressurizing wheel, and the rotating shaft extends into the inner cylinder.

[0018] By adopting the above technical solution, the existence of the pressurizing mechanism can reduce the hydraulic loss caused by sediment separation.

[0019] In a preferred embodiment, the present application can be further configured as follows: the rotating shaft and the inner cylinder form a partial or dynamic water seal.

[0020] By adopting the above technical solution, that is, by forming a partial or dynamic water seal, a better sediment removal effect can be achieved for water flows with a large amount of sediment.

[0021] In a preferred embodiment, the present application can be further configured as follows: the inner cylinder includes a support cylinder, an annular flow channel is disposed on the outer wall surface of the support cylinder. Let the inner diameter of the support cylinder be R1, the outer diameter be R2, the distance from the outer wall surface of the annular flow channel to the axis be R3, and the distance between the support cylinder and the rotating shaft be B, then it satisfies π(R1 2 -(R1 - B) 2 ) ≤ π(R3 2 -R2 2 ).

[0022] By adopting the above technical solution, when the sediment volume is low, a form with a gap between the inner cylinder and the rotating shaft can be adopted.

[0023] This application also discloses a water pump: adopting the above sand filtration device, and the sand filtration device is installed in front of the inlet of the water pump.

[0024] This application has the following advantages:

[0025] 1. The spiral annular flow channel and the arrangement of the sand discharge channel enable the water flow in the annular flow channel to discharge sediment due to the effects of impact, gravity, etc. during the forward process;

[0026] 2. The existence of the sand retention groove reduces the probability of sediment re-entering the water flow due to the subsequent water flow action;

[0027] 3. A relatively stable environment is formed between the sand storage cavity and the inner cylinder, which is conducive to sediment aggregation;

[0028] 4. When the inner wall of the support cylinder contacts or has a small gap with the rotating shaft / connector, the water flow affected by the inducer wheel enters the annular flow channel, thereby enhancing the ability to filter sediment;

[0029] 5. When there is a gap (not a small gap) between the inner wall of the support cylinder and the rotating shaft / connector, the diverted flow directly passing through the filtering device converges at the water outlet end of the annular flow channel and the opening end of the sand collection cylinder, and then the flow velocity is increased and the flow rate is supplemented;

[0030] 6. Setting the booster wheel can provide an initial circulation (circumferential flow) to offset the losses generated by the annular flow channel, and can also improve the cavitation resistance performance of the water pump;

[0031] 7. The modular sand filtration device makes the sand filtration device convenient for installation, disassembly and selection of different combinations according to the actual scenario. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the internal structure of the outer cylinder of this application.

[0033] Figure 2 It is an exploded structure schematic diagram of the outer cylinder and the inner cylinder of this application.

[0034] Figure 3 It is a schematic diagram of the internal structure of the booster mechanism and the filtration mechanism of this application.

[0035] Figure 4 It is a schematic diagram of the structure of the water pump installed with the filtration device of this application.

[0036] Reference numerals: 1, outer cylinder; 11, sand storage cavity; 12, discharge hole; 2, filtering mechanism; 21, support cylinder; 211, flow-through hole; 22, filtering part; 221, transverse plate; 222, connecting wall; 223, vertical side wall; 224, sand discharge channel; 225, sand retention groove; 23, annular flow channel; 3, pressurizing mechanism; 31, rotating shaft; 32, pressurizing wheel. Detailed implementation mode

[0037] The present application will be further described in detail below with reference to the accompanying drawings.

[0038] Refer to Figures 1 - 3 , a sand filtering device disclosed in the present application, includes a pressurizing mechanism 3, an outer cylinder 1, and a filtering mechanism 2 arranged inside the outer cylinder 1. The filtering mechanism 2 includes an inner cylinder, and the inner cylinder includes a support cylinder 21 and a filtering part 22. The filtering part 22 is spirally wound around the support cylinder 21 in one or more loops to form at least one annular flow channel 23. When there are multiple annular flow channels 23, it can be in the form of a multi-start helix. At least one flow-through hole 211 is provided on the support cylinder 21, and the flow-through hole 211 is communicated with the annular flow channel 23.

[0039] The annular flow channel 23 is provided with a sand discharge channel 224. The inner cylinder and the outer cylinder 1 form a sand storage cavity 11, and the sand discharge channel 224 is communicated with the sand storage cavity 11. The annular flow channel 23 includes a number of spiral grooves (that is, the annular flow channel 23 is spirally arranged, and a single spiral is regarded as a spiral groove). The spiral groove includes a sand retention groove 225. The sand retention groove 225 is located on the side of the annular flow channel 23 close to the outer cylinder 1, and the sand retention groove 225 is communicated with the sand discharge channel 224. The sand retention groove 225 is the lowest end of the spiral groove. The bottom of the sand storage cavity 11 is inclined, and a discharge hole 12 is provided at the lowest point, and the discharge hole 12 discharges the sediment to the outside of the water pump through a pipeline. Refer to Figure 1 , the lowest end refers to Figure 1 the lowest end of the spiral groove in the cross-sectional view in

[0040] The filtering part 22 includes a plurality of connected helices (i.e., the filtering part 22 is helically arranged, and a single-turn helix is regarded as a helix). The helix includes a connecting body and a contacting member. The contacting member is connected to the connecting body. A sand discharge channel 224 is formed between a contacting member and the connecting member of another helix. The helix includes a transverse plate 221 and a vertical side wall 223. The transverse plate 221 and the vertical side wall 223 are connected by a connecting wall 222. The cross-section of the connecting wall 222 can be arc-shaped or zigzag-shaped. At least a part of the vertical side wall 223 is a contacting member and contacts the connecting body of the next helix (i.e., composed of the transverse plate 221 and the connecting wall 222, or composed of the transverse plate 221, the connecting wall 222 and at least a part of the vertical side wall 223). At this time, the contacting member and the connecting body of the next helix form a sand retaining groove 225, and the sand discharge channel 224 is formed by the deformation of the contacting member. In this embodiment, the contacting member is an elastic member, such as a rubber material. In other embodiments, the contacting member can be a non-elastic member. At this time, the contacting member does not contact the connecting body of the next helix, and there is a channel between the two for sediment to pass through, and this channel is the sand discharge channel 224. The lower end of the sand storage cavity 11 is U-shaped, and the lowermost contacting member extends into the sand storage cavity 11 and is close to or contacts the inner wall of the sand storage cavity 11. When the contacting member is connected to the connecting body of the next helix, the sand discharge channel 224 is in a hole shape or a groove shape and is located at or near the connection of the two.

[0041] The pressurizing mechanism 3 is arranged at the water inlet end and / or the water outlet end of the outer cylinder 1. The pressurizing mechanism 3 includes a rotating shaft 31 and a pressurizing wheel 32. The rotating shaft 31 extends into the inner cylinder, and the pre-rotation direction of the pressurizing wheel 32 is the same as the rotation direction of the annular flow channel 23.

[0042] Let the inner diameter of the support cylinder 21 be R1, the outer diameter be R2, the distance from the outer wall surface of the annular flow channel 23 to the axis be R3, and the distance between the support cylinder 21 and the rotating shaft 31 be B. Then it satisfies π(R1 2 -(R1 - B) 2 ) ≤ π(R3 2 -R2 2 ), that is, the annular axial projection area of the distance formed inward by the support cylinder 21 is not greater than the axial projection area of the annular flow channel 23. A local or dynamic water seal is formed between the rotating shaft 31 and the inner cylinder, that is, when B is small, such as B ≤ 0.5 mm.

[0043] When connected to a water pump, the shaft of the water pump extending into the support cylinder 21 and / or the connecting shaft should also be regarded as a part of the rotating shaft 31.

[0044] This application also discloses a water pump. Refer to Figure 4, including the above-mentioned sand filtering device, which is installed in the front of the water inlet of the water pump, that is, indirectly or directly connected to the water pump, that is, the sand filtering device is located between the motor and the pump body, and the pre-rotation direction of the booster wheel 32 is the same as the rotation direction of the impeller in the pump body; the rotating shaft 31 of the booster wheel 32 is coaxially driven and connected to the motor output shaft and the pump shaft; by setting a modular sand filtering device, the sand filtering device is convenient for installation, disassembly and selection of different combinations according to the actual scenario.

[0045] The implementation principle of this embodiment is as follows: after the water flow passes through the booster wheel 32, the water flow enters the annular flow channel 23. During the forward movement of the water flow in the flow channel, due to the effects of impact, gravity, etc., the sediment enters the sand storage cavity 11, and under the action of the inclined bottom surface of the sand storage cavity 11, it is discharged from the discharge hole 12. The pipeline can be connected to the discharge hole 12 as needed to discharge the sediment to a suitable position.

[0046] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A sand filtering device, characterized in that: It includes a filtering mechanism (2), and the filtering mechanism (2) includes an inner cylinder. An annular flow channel (23) is provided on the inner cylinder. The annular flow channel (23) includes a plurality of spiral grooves, and the plurality of spiral grooves are connected in sequence to form a spiral shape. A sand discharge channel (224) is provided in the annular flow channel (23). The sand discharge channel (224) is located at the axial contact of adjacent spiral grooves or below the groove wall of the spiral groove near the axial contact of two spiral grooves; The spiral groove includes a sand retention groove (225), and the sand retention groove (225) is located on the side of the annular flow channel (23) away from the support cylinder (21). The sand retention groove (225) communicates with the sand discharge channel (224), and the sand retention groove (225) is the lowest end of the spiral groove; The inner cylinder includes a support cylinder (21) and a filtering part (22). The filtering part (22) includes a plurality of connected spirals. The spiral includes a connecting body and a contact part. The contact part is connected to the connecting body. One contact part and the connecting body of another spiral form a sand discharge channel (224).

2. The sand filtering device according to claim 1, wherein: The filtering part (22) is located outside the support cylinder (21) and is connected to the support cylinder (21) to form an annular flow channel (23). An overflow hole (211) communicating with the annular flow channel (23) is provided on the support cylinder (21), and the sand discharge channel (224) communicates with the annular flow channel (23).

3. The sand filtering device according to claim 1, characterized in that: There is at least one annular flow channel (23).

4. A sand filtering device according to claim 1, characterized in that: It further includes an outer cylinder (1). The filtering mechanism (2) is arranged inside the outer cylinder (1), and a sand storage cavity (11) is formed between the outer cylinder (1) and the inner cylinder.

5. A sand filtering device according to claim 1, characterized in that: It further includes a pressurizing mechanism (3). The pressurizing mechanism (3) is arranged at the water inlet end and / or the water outlet end of the outer cylinder (1). The pressurizing mechanism (3) includes a rotating shaft (31) and a pressurizing wheel (32), and the rotating shaft (31) extends into the inner cylinder.

6. The sand filtering device according to claim 5, characterized in that: The rotating shaft (31) and the inner cylinder form a partial or dynamic water seal.

7. The sand filtering device according to claim 5, wherein: The inner cylinder includes a support cylinder (21), and an annular flow channel (23) is arranged on the outer wall surface of the support cylinder (21). Let the inner diameter of the support cylinder (21) be R1, the outer diameter be R2, the distance from the outer wall surface of the annular flow channel (23) to the axis be R3, and the distance between the support cylinder (21) and the rotating shaft (31) be B. Then it satisfies π(R1 2 -(R1 - B) 2 ) ≤ π(R3 2 - R2 2 ).

8. A water pump, characterized in that, Adopt the sand filtering device according to any one of claims 1-7. The sand filtering device is installed in front of the inlet of the water pump.

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