Volute structure for reducing pump noise

Abstract

The utility model relates to the technical field of water pumps, in particular to a volute structure for reducing pump noise, which can reduce noise vibration caused by dynamic and static interference. Comprising a volute main body, the volute main body is composed of an upper volute and a lower volute, an upper and lower separated baffle tongue in the upper volute is changed into an integral baffle tongue, and the integral baffle tongue in the upper volute moves the separation position in the direction far away from an outlet.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a volute structure for improving the noise of the pump. Background Art

[0002] A water pump is a machine for transporting liquids or increasing the pressure of liquids. It transmits the mechanical energy of the prime mover or other external energy to the liquid, increasing the energy of the liquid. It is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspension liquids, and liquid metals, etc. For example, a new type of water pump proposed in the prior art publication number CN212615422U includes a water pump housing, a stator, a water pump inner housing, a motor shaft, a pumping rotor, and a water pump volute. When the pump generates a static pressure component, it also generates a dynamic pressure component, that is, pressure pulsation. The pressure pulsation is superimposed on the static pressure component like an AC signal. Most centrifugal pumps use a spiral volute. The asymmetry between the volute and the cut-off tongue causes an annular distortion in the flow at the impeller outlet. Especially at off-design operating points, the distortion is more severe. Therefore, when designing the main shaft, the radial force caused by the unbalanced pressure distribution must be considered. The pressure pulsation in a centrifugal pump is extremely complex. For the same pump, different operating conditions present different types of pressure pulsation. Therefore, the position of the cut-off tongue is the main factor causing noise and vibration in the pump. As shown in the attached... Figure 1 As shown, the pump housing used in existing products is generally a split type, that is, the upper and lower volute channels of the volute are evenly divided into two parts, and the cut-off tongue part is also divided into two parts. As can be seen from the above, the principle of the cut-off tongue generating noise and vibration is that every time the impeller rotates one circle, a fluctuation is generated at the cut-off tongue. Due to the split volute form, due to error factors such as manufacturing tolerances and assembly tolerances of parts, there will always be a certain error between the upper and lower cut-off tongues after assembly, which increases the vibration and noise at the cut-off tongue, especially the order noise of 2 times the blade frequency. Summary of the Utility Model

[0003] To solve the above technical problems, the utility model provides a volute structure for improving the noise of the pump, which can reduce the noise and vibration caused by the interference between the moving and the static.

[0004] A volute structure for improving the noise of the pump according to the utility model includes a volute main body, which is composed of an upper volute and a lower volute. The upper volute changes the split cut-off tongue into an integral cut-off tongue inside, and the integral cut-off tongue in the upper volute moves the separation position away from the outlet direction; changing the split cut-off tongue into an integral cut-off tongue and still using the upper and lower shell type for assembly, the integral cut-off tongue moves the separation position away from the outlet direction, which can reduce the noise and vibration caused by the interference between the moving and the static.

[0005] Preferably, a motor shaft is installed in the middle of the bottom end inside the lower volute.

[0006] Preferably, a fixing seat is fixedly installed at the top of the upper volute through a support rod; after the upper volute and the lower volute are connected, the top of the motor shaft is inserted into the fixing seat to ensure stability.

[0007] Preferably, a plurality of reinforcing ribs are fixedly installed on the outer wall of the bottom of the lower volute; the plurality of reinforcing ribs can increase the structural strength of the bottom of the lower volute and improve stability.

[0008] Compared with the prior art, the beneficial effect of the present utility model is that the upper and lower separated tongues are changed into an integral tongue, and the assembly still adopts the upper and lower shell type. The integral tongue moves the separation position away from the outlet direction, which can reduce the noise and vibration caused by the dynamic and static interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a structural schematic diagram of the prior art;

[0010] Figure 2 is a structural schematic diagram of the present utility model;

[0011] Figure 3 is a partial sectional structural schematic diagram of the present utility model;

[0012] Figure 4 is a three-dimensional structural schematic diagram of the upper volute of the present utility model;

[0013] Figure 5 is a sectional structural schematic diagram of the upper volute of the present utility model;

[0014] Figure 6 is a sectional structural schematic diagram of the lower volute of the present utility model;

[0015] Reference numerals in the drawings: 1, volute main body; 2, upper volute; 3, lower volute; 4, motor shaft; 5, fixing seat; 6, reinforcing rib. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0017] Such as Figures 2 to 6As shown in the figure, the volute main body 1 is composed of an upper volute 2 and a lower volute 3. Inside the upper volute 2, the upper and lower separated tongues are changed into an integral tongue. The integral tongue inside the upper volute 2 moves the separation position away from the outlet direction. In the middle of the bottom end inside the lower volute 3, a motor shaft 4 is installed. On the top of the upper volute 2, a fixed seat 5 is fixedly installed through a support rod. On the outer wall of the bottom of the lower volute 3, a plurality of reinforcing ribs 6 are fixedly installed; changing the upper and lower separated tongues into an integral tongue, the assembly still adopts the upper and lower shell type. The integral tongue moves the separation position away from the outlet direction, which can reduce the noise and vibration caused by the dynamic and static interference. After the upper volute 2 and the lower volute 3 are connected, the top of the motor shaft 4 is inserted into the fixed seat 5 to ensure stability. The plurality of reinforcing ribs 6 can increase the structural strength of the bottom of the lower volute 3 and improve stability.

[0018] As Figures 2 to 6 As shown in the figure, a volute structure for improving the pump noise of the present utility model, when it works, the volute main body 1 is composed of an upper volute 2 and a lower volute 3. The plurality of reinforcing ribs 6 can increase the structural strength of the bottom of the lower volute 3. Inside the upper volute 2, the upper and lower separated tongues are changed into an integral tongue. The integral tongue inside the upper volute 2 moves the separation position away from the outlet direction, which can reduce the noise and vibration caused by the dynamic and static interference.

[0019] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A volute structure for improving pump noise, characterized in that, It includes a volute main body (1), and the volute main body (1) is composed of an upper volute (2) and a lower volute (3). Inside the upper volute (2), the upper and lower separated cut-off tongues are changed into an integral cut-off tongue, and the integral cut-off tongue inside the upper volute (2) moves the separation position away from the outlet direction.

2. The volute structure for improving pump noise according to claim 1, characterized in that, In the middle of the inner bottom end of the lower volute (3), a motor shaft (4) is installed.

3. The volute structure for improving pump noise according to claim 1, characterized in that, On the top of the upper volute (2), a fixed seat (5) is fixedly installed through a support rod.

4. The volute structure for improving pump noise according to claim 1, characterized in that On the outer wall of the bottom of the lower volute (3), a plurality of reinforcing ribs (6) are fixedly installed.

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