Low-noise centrifugal pump

Abstract

The invention relates to the field of centrifugal pumps, in particular to a low-noise centrifugal pump which comprises a motor, a turbine cavity is formed in the driving end of the motor and composed of a motor base and a turbine cover at the driving end, a flow inlet is formed in the middle of the turbine cavity, a flow outlet extends in the tangential direction of the edge of the turbine cavity, an impeller assembly is arranged in the turbine cavity, and an insert is arranged in the flow inlet. The insert comprises an annular fixing part clamped on the side wall of the flow inlet, a shaft seat is connected to the inner side of the annular fixing part, the impeller assembly comprises an impeller and a magnetic core arranged on one side of the impeller and concentric with the impeller, and the two ends of a fixing shaft of the impeller assembly are arranged in the shaft seat and a turbine cavity respectively. The edge of a flow inlet hole in the upper top face of the impeller extends upwards in an arc mode to form a flow blocking face. The inner side end face of the turbine cover is a flow guiding face inclining downwards from the middle to the periphery. And the annular fixing part extends downwards and enters the impeller. Fluid is effectively guided, fluid disturbance caused by the fact that the fluid directly impacts the impeller is avoided, and noise caused by mutual impact between the fluids is avoided.

Description

Technical Field

[0001] The invention relates to a centrifugal pump, in particular to a centrifugal pump with reduced noise. Background Art

[0002] A centrifugal pump includes a movement as a driving mechanism, which is connected to an impeller. The impeller drives the fluid to rotate, thereby generating centrifugal force in the fluid, and finally drives the fluid to move. Centrifugal pumps have been widely used in life, especially in household appliances. Therefore, the noise generated by the operation of the motor poses a great obstacle to the quiet demand for household appliances. Basically, most of the noise of household appliances with motors comes from the motors.

[0003] The centrifugal pump with the publication number "CN 110886703 A" in the Chinese Patent Library mainly solves the noise problem of the centrifugal pump and is the closest solution to the present application. The main solution adopted is: a rubber suction cup is arranged at the lower end of the pump body, a spring pad is arranged between the motor housing and the fixed column, a rubber suction cup is arranged under the fixed column, and the pump body and the fixed column are fixed to the ground by the rubber suction cup, thereby avoiding resonance between the motor and the pump body and reducing the noise of the centrifugal pump; on the other hand, a sound insulation plug is arranged on the drive shaft, and a series of operations such as the above are performed to achieve noise reduction.

[0004] In the household appliance industry, the technology is mature at this stage. The noise caused by resonance accounts for a small proportion of the total noise. The main noise of centrifugal pumps comes from the disturbance of the fluid, the change in fluid velocity causing the front and rear fluids to impact each other, the change in fluid density in the pump body and the impact on the cavity. Summary of the invention

[0005] In order to solve the noise caused by fluid disturbance in the existing centrifugal pump, the present invention provides a low-noise centrifugal pump.

[0006] The technical solution adopted by the present invention is: a low-noise centrifugal pump, including a motor, a turbine chamber is provided at the driving end of the motor, the turbine chamber is composed of a motor seat and a turbine cover at the driving end, an inlet is provided in the middle of the turbine chamber, an outlet is extended in the tangential direction of the edge of the turbine chamber, an impeller assembly is provided in the turbine chamber, an insert is provided in the inlet, the insert includes an annular fixing portion clamped on the side wall of the inlet, a shaft seat is connected to the inner side of the annular fixing portion, the impeller assembly includes an impeller and a magnetic core arranged on one side of the impeller and concentrically arranged with the impeller, two ends of the fixed shaft of the impeller assembly are respectively arranged in the shaft seat and the turbine chamber, the impeller includes an upper top surface, a lower top surface and blades are arranged between the upper top surface and the lower top surface, an inlet hole is opened in the middle of the upper top surface, the inlet hole edge of the upper top surface of the impeller extends upward in an arc shape to form a baffle surface, and the inner end surface of the turbine cover is a guide surface inclined downward from the middle to the surrounding area; the annular fixing portion extends downward and enters the inlet hole.

[0007] As one of the preferred solutions for a low-noise centrifugal pump, the upper end surface of the lower top surface is an arc surface with a high center and low sides. The fluid flows from the inlet through the middle of the insert to the inlet hole, passes through the arc space between the upper top surface and the lower top surface, flows to the edge of the turbine chamber, and flows out from the outlet.

[0008] As one of the preferred solutions for a low-noise centrifugal pump, the upper end surface of the lower top surface is an arc surface with a high center and low sides, and a fluid channel with a wide center and narrow sides is formed between the upper top surface and the lower top surface.

[0009] As one of the preferred solutions for a low-noise centrifugal pump, a buffer groove is provided at the lower end of the inlet hole of the impeller assembly.

[0010] As one of the preferred solutions for a low-noise centrifugal pump, the impeller blades are directly opposite to the middle of the outlet.

[0011] As one of the preferred solutions for a low-noise centrifugal pump, the lower end surface of the lower top surface is a normal plane perpendicular to the rotation direction, and the lower end surface of the turbine chamber is arranged parallel to the lower end surface of the lower top surface.

[0012] As one of the preferred solutions for a low-noise centrifugal pump, the inner wall of the insert is flush with the inner wall of the inlet.

[0013] As one of the preferred solutions for a low-noise centrifugal pump, the baffle surface extends into the flow inlet, an annular groove is provided on the outer edge of the lower end of the annular fixed surface, the baffle surface extends between the flow inlet and the annular groove, and the outer wall of the annular fixed surface and the inner wall of the baffle surface form an upward channel for the fluid.

[0014] As one of the preferred solutions for a low-noise centrifugal pump, the lower end of the annular fixing portion is expanded.

[0015] The beneficial effects of the present invention are as follows: an insert is used and the annular fixing part is extended into the inlet hole to directly introduce the fluid into the impeller, effectively guiding the fluid to avoid the disturbance of the fluid caused by the direct impact of the fluid on the impeller, and avoiding the noise caused by the impact between the fluids; the setting of the top surface of the impeller and the top surface of the turbine cover makes the fluid flow through from the side at an angle, reducing the direct impact at the end of the channel. When the centrifugal pump is working, the main fluid is thrown out from the middle of the impeller, and the tangent form of the fluid with a slower flow rate on the side is introduced smoothly, effectively reducing the fluid noise; a buffer groove is arranged at the lower end of the inlet hole to make the incoming fluid impact with the fluid in the buffer groove to avoid the noise caused by direct impact with the impeller; an upward channel is arranged above the impeller to reduce the fluid volume and fluid speed at the upper end of the impeller, and reduce the impact of the rear end on the outlet; the expansion setting of the lower end of the annular fixing part is conducive to the fluid flowing out of the middle of the impeller; the inlet hole extending from the inner side of the blade is effectively used to actively guide the liquid flowing into the inlet hole into the blade, reducing the impact between fluids. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a stereogram of the present invention.

[0017] Figure 2 It is an exploded view of the present invention.

[0018] Figure 3 It is a cross-sectional view of the present invention.

[0019] Figure 4 Schematic diagram of the impeller of the present invention.

[0020] Figure 5 This is a cross-sectional view of embodiment 2 of the present invention.

[0021] Figure 6 This is a cross-sectional view of embodiment 3 of the present invention.

[0022] Among them: 1. Motor; 11. Turbine chamber; 12. Turbine cover; 13. Inlet; 14. Outlet; 2. Impeller assembly; 3. Insert; 31. Annular fixing portion; 32. Shaft seat; 21. Impeller; 22. Magnetic core; 211. Upper top surface; 212. Lower top surface; 213. Blade; 214. Inlet hole; 2111. Baffle surface; 121. Guide surface; 4. Annular groove; 5. Upward channel; 6. Buffer groove. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the scheme of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiment is a part of the embodiment of the present application, not all of the embodiments. The listing of all technical features in the dependent claims in a certain embodiment does not mean that this part is a necessary technical feature. This embodiment is for the purpose of simply and clearly describing the technical scheme. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0024] Example 1 Figures 1 to 4As shown: a low-noise centrifugal pump, including a motor 1, a turbine chamber 11 is provided at the driving end of the motor 1, the turbine chamber 11 is composed of a motor 1 base and a turbine cover 12 at the driving end, an inlet 13 is provided in the middle of the turbine chamber 11, an outlet 14 extends in the tangential direction of the edge of the turbine chamber 11, an impeller 21 assembly 2 is provided in the turbine chamber 11, an insert 3 is provided in the inlet 13, the insert includes an annular fixing portion 31 clamped on the side wall of the inlet 13, a shaft seat 32 is connected to the inner side of the annular fixing portion 31, and the impeller 21 assembly 2 includes an impeller 21 and a shaft seat 32 arranged on one side of the impeller 21 and connected to the impeller 2 1 The magnetic core 22 is concentrically arranged, and the two ends of the fixed axis of the impeller 21 assembly 2 are respectively arranged in the shaft seat 32 and the turbine chamber 11. The impeller 21 includes an upper top surface 211, a lower top surface 212, and blades 213 are arranged between the upper top surface 211 and the lower top surface 212. An inlet hole 214 is opened in the middle of the upper top surface 211. The edge of the inlet hole 214 of the upper top surface 211 of the impeller 21 extends upward in an arc shape to form a baffle surface 2111. The inner end surface of the turbine cover 12 is a guide surface 121 that tilts downward from the middle to the surrounding area; the annular fixing portion 31 extends downward and enters the inlet hole 214. The fluid enters from the inlet port 13, passes through the insert and directly enters the inlet hole 214 of the impeller 21, and then is thrown between the upper top surface 211 and the lower top surface 212 of the impeller 21 to the edge and flows out from the outlet port 14. Part of the overflow liquid flows out between the diverter surface and the annular fixing portion 31.

[0025] In this embodiment, in order to reduce the impact noise caused by the sudden turning of the fluid, the upper end surface of the lower top surface 212 is an arc surface with a high center and low two sides. The fluid flows from the inlet 13 through the middle of the insert to the inlet hole 214, passes through the arc space between the upper top surface 211 and the lower top surface 212, flows to the edge of the turbine chamber 11, and flows out from the outlet 14.

[0026] In this embodiment, the upper end surface of the lower top surface 212 is an arc surface with a high center and low sides, and a fluid channel with a wide center and narrow sides is formed between the upper top surface 211 and the lower top surface 212 .

[0027] In this embodiment, a buffer groove 6 is provided at the lower end of the inlet hole 214 of the impeller 21 assembly 2. The buffer groove 6 is provided to effectively prevent the incoming fluid from directly impacting the impeller 21 and thus generating noise.

[0028] In this embodiment, the blades 213 of the impeller 21 are directly opposite to the middle of the outlet 14 to ensure smooth outflow of the fluid.

[0029] In this embodiment, the lower end of the impeller 21 is horizontally arranged to reduce the bottom fluid fluctuations. The lower end surface of the lower top surface 212 is a normal plane perpendicular to the rotation direction. The lower end surface of the turbine chamber 11 is parallel to the lower end surface of the lower top surface 212.

[0030] Embodiment 2: This embodiment is a further improvement based on embodiment 1. Figure 5The inner wall of the insert is flush with the inner wall of the inlet 13 .

[0031] Embodiment 3: This embodiment is a further improvement based on embodiment 1. Figure 5 As shown: the baffle surface 2111 extends into the flow inlet 13, an annular groove 4 is provided on the outer edge of the lower end of the annular fixed surface, the baffle surface 2111 extends between the flow inlet 13 and the annular groove 4, and the outer wall of the annular fixed surface and the inner wall of the baffle surface 2111 form a fluid upward channel 5.

[0032] Embodiment 4: This embodiment is a further improvement based on embodiment 1. Figure 6 As shown: the lower end of the annular fixing portion 31 is expanded.

[0033] The above limitations on directions such as up and down are for the convenience of description. Secondly, to simplify the description and facilitate understanding, some non-essential technical contents are listed in Example 1, which does not mean that the solution of Example 1 must be adopted to implement the solution of this application. Any third party can choose to screen the technical contents as needed to evolve the application. It should be noted that the scope of protection of this application is based on the claims, and the above-mentioned evolution based on the screening of technical features should be understood to fall within the scope of protection of this application.

Claims

1. A low-noise centrifugal pump, comprising a motor (1), a driving end of the motor (1) being provided with a turbine chamber (11), the turbine chamber (11) being composed of a motor (1) seat and a turbine cover (12) at the driving end, a flow inlet (13) being provided in the middle of the turbine chamber (11), an outlet (14) extending in a tangential direction from the edge of the turbine chamber (11), an impeller (21) assembly (2) being provided in the turbine chamber (11), characterized in that: An insert (3) is provided in the inlet (13), the insert comprising an annular fixing portion (31) clamped on the side wall of the inlet (13), the inner side of the annular fixing portion (31) being connected to a shaft seat (32), the impeller (21) assembly (2) comprising an impeller (21) and a magnetic core (22) arranged on one side of the impeller (21) and concentrically arranged with the impeller (21), the two ends of the fixed shaft of the impeller (21) assembly (2) being respectively arranged in the shaft seat (32) and the turbine chamber (11), the impeller (21) comprising an upper top surface (211), a lower top surface (212), and blades (213) being provided between the upper top surface (211) and the lower top surface (212), an inlet hole (214) being provided in the middle of the upper top surface (211), and the annular fixing portion (31) extending downwardly and entering the inlet hole (214).

2. The low noise centrifugal pump according to claim 1, characterized in that: The edge of the inlet hole (214) of the upper top surface (211) of the impeller (21) extends upward in an arc shape to form a baffle surface (2111); the inner end surface of the turbine cover (12) is a flow guide surface (121) that tilts downward from the middle to the surrounding areas; the upper end surface of the lower top surface (212) is an arc surface with a high center and low sides; the fluid flows from the inlet port (13) through the middle of the insert to the inlet hole (214), passes through the arc space between the upper top surface (211) and the lower top surface (212), flows to the edge of the turbine chamber (11), and flows out from the outlet port (14).

3. The low noise centrifugal pump according to claim 2, characterized in that: The upper end surface of the lower top surface (212) is an arc surface with a high center and low sides, and a fluid channel with a wide center and narrow sides is formed between the upper top surface (211) and the lower top surface (212).

4. The low noise centrifugal pump according to claim 2, characterized in that: A buffer groove (6) is provided at the lower end of the inlet hole (214) of the impeller (21) assembly (2).

5. The low noise centrifugal pump according to claim 1, characterized in that: The blades (213) of the impeller (21) are directly opposite to the middle position of the outlet (14).

6. The low noise centrifugal pump according to claim 1, characterized in that: The lower end surface of the lower top surface (212) is a normal plane perpendicular to the rotation direction, and the lower end surface of the turbine chamber (11) is arranged parallel to the lower end surface of the lower top surface (212).

7. The low noise centrifugal pump according to claim 1, characterized in that: The inner wall of the insert is flush with the inner wall of the inlet (13).

8. The low noise centrifugal pump according to claim 1, characterized in that: The baffle surface (2111) extends into the flow inlet (13); an annular groove (4) is provided on the outer edge of the lower end of the annular fixed surface; the baffle surface (2111) extends between the flow inlet (13) and the annular groove (4); and the outer wall of the annular fixed surface and the inner wall of the baffle surface (2111) form a fluid upward passage (5).

9. The low noise centrifugal pump according to claim 1, characterized in that: The lower end of the annular fixing portion (31) is expanded.

10. The low noise centrifugal pump according to claim 1, characterized in that: The inner side of the blade (213) extends out of the inlet hole (214).

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