Centrifugal water pump with cutting at water inlet end

Abstract

The utility model discloses a centrifugal water pump with cutting in water inlet end, including pump shell, impeller, flow guide cone, fixed cutting part and moving cutting part. The flow guide cone sets up at the front end of impeller, and is equipped with the corrugated chute, and the moving cutting part forms radial reciprocating motion through the cooperation of the slide head and the corrugated chute, and the moving cutting part is oppositely arranged with the fixed cutting part and is equipped with the cutting edge on the contact surface, is used for shearing the impurity. The pump shell liquid inlet port one side is equipped with a plurality of side liquid inlet holes, and the partial water flow is guided to enter between the fixed cutter ring and the moving cutter ring and carries the impurity, realizes synchronous suction and shearing in the pump body operation process. The structure realizes the automatic cutting of the flexible winding object under the premise of not increasing the external driving mechanism, improves the water pump operation stability and the anti -stall ability, is applicable to the agricultural drainage, municipal sewage treatment and other impurity liquid working condition.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal water pump technology, specifically a centrifugal water pump with a cutter at the inlet end. Background Technology

[0002] Centrifugal water pumps, as commonly used liquid conveying equipment, are widely used in fields such as farmland irrigation, sewage discharge, rainwater drainage, and municipal engineering. Traditional centrifugal water pumps typically have an open inlet structure, where water flows directly into the impeller area inside the pump body from the outside and is conveyed by centrifugal force. To improve the pump's inlet efficiency and prevent larger particles from entering, some designs incorporate primary protective devices such as metal filters or flow deflectors at the inlet end.

[0003] However, in actual use, under complex conditions such as rural irrigation ditches, urban flooding, and industrial circulating water, a large amount of soft foreign matter such as aquatic plants, cotton wool, and fibrous impurities often enters the inlet. These foreign matter can easily become entangled in the impeller or pump shaft, leading to increased pump operating resistance, reduced conveying efficiency, and even rotor jamming and bearing burnout, seriously affecting the stability and service life of the equipment.

[0004] In existing technologies, to improve the pump body's anti-clogging capability, some pump structures incorporate impeller cutting teeth or rotary cutter discs at the bottom of the pump chamber to achieve debris crushing. These structures generally rely on high-speed motor drive to collide and crush foreign objects. While this improves throughput to some extent, it has the following drawbacks: The cutting components rely on the high-speed rotation of the impeller, which has structural limitations such as fixed cutting position and non-adjustable shearing angle, and is not effective at shearing flexible impurities such as aquatic plants; the cutting area is located in the impeller area or at the rear end of the impeller, which is far away from the liquid inlet, and impurities are prone to entanglement once they enter the pump cavity, resulting in sluggish cutting efficiency; the structure is mostly rigid cutting method, which has large vibration and impact, accelerates impeller wear, and reduces pump stability.

[0005] Therefore, existing technologies still lack a centrifugal water pump structure that is compact, can achieve pre-active cutting at the inlet port, and can automatically perform linkage cutting with fluid movement, in order to meet the higher requirements for anti-stagnation capability and continuous stable operation under the condition of transporting water containing impurities. Utility Model Content

[0006] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0007] Therefore, the technical solution adopted by this utility model is: a centrifugal water pump with a cutting end at the water inlet, which realizes the automatic foreign object shearing function at the water inlet of the pump body by arranging an annular cutting unit composed of a fixed cutting part and a moving cutting part at the liquid inlet port, combined with the wave-shaped sliding groove on the surface of the guide cone to guide the reciprocating motion of the moving cutting part, thereby improving the pump body's operational stability.

[0008] The centrifugal water pump with inlet cutting according to this utility model includes a pump casing, an impeller, a guide cone, a fixed cutting component, and a moving cutting component, with the specific structural configuration as follows: In a preferred embodiment, the pump housing is provided with an inlet port, and a plurality of radially arranged side inlet holes are opened on the outer periphery of the inlet port; a fixed cutting component is fixedly installed on the inner side of the inlet port, and a movable cutting component is slidably installed on the inner side of the inlet port to form a cutting pair that can reciprocate relative to each other.

[0009] Specifically, this structure allows flexible impurities to actively enter the cutting area during pump operation, and, in conjunction with the reciprocating motion of the moving blade, achieve shearing and crushing of foreign objects, effectively preventing blockage.

[0010] In a preferred example, the guide cone is fixedly installed at the front end of the impeller, and the two are arranged coaxially. The surface of the guide cone is provided with several wave-shaped grooves, which are evenly distributed along the circumference and connected end to end; the moving cutting part is provided with several sliding heads in the middle, which can be slidably sleeved on the inner wall of the groove to realize reciprocating motion during rotation.

[0011] Specifically, automatic linkage shearing is achieved without adding an external power source by sliding contact between the guide cone and the moving cutting component.

[0012] In a preferred example, the moving cutting element is composed of several concentrically arranged moving blade rings connected by connecting rods, and a slider is provided on the outer periphery; the slider is embedded in a linear groove provided in the pump housing to restrict the reciprocating motion trajectory of the moving blade rings.

[0013] Specifically, this configuration enables the moving blade ring to form a stable reciprocating motion driven by the impeller, thereby improving the accuracy of the shearing path.

[0014] In a preferred example, the fixed cutting component consists of several fixed blade rings arranged concentrically and fixedly installed on the inner wall of the liquid inlet port by a fixing rod; each moving blade ring is set in correspondence with the corresponding fixed blade ring, and both of them have cutting edges on their contact surfaces.

[0015] Specifically, through a series of corresponding moving and stationary cutting rings, effective shearing can be performed when impurities enter, thereby improving processing efficiency.

[0016] In a preferred example, the side inlet hole is located on the outer periphery of the pump housing inlet port and is positioned opposite the gap region between the fixed cutter ring and the moving cutter ring.

[0017] Specifically, when the water pump is running, the impeller creates a negative pressure zone, which guides some of the liquid into the side inlet hole, pushes flexible impurities towards the shear zone, and increases the probability of impurity intake.

[0018] In a preferred example, the guide cone is a conical structure with a tapered diameter at the end away from the pump casing, which has the function of rectifying and guiding liquid into the impeller area.

[0019] Specifically, the cone structure helps stabilize the water flow direction, reduce eddies, improve the efficiency of fluid entering the impeller, and enhance the hydraulic suction capacity in the shear zone.

[0020] In a preferred embodiment, the slide head end face is configured as a hemispherical structure, and both the slide head surface and the inner wall of the slide groove are hardened to improve sliding wear resistance and guiding accuracy.

[0021] Specifically, the high precision of the fit between the slide head and the groove improves the reliability of the reciprocating shearing action, extends the service life, and reduces structural wear.

[0022] The beneficial effects achieved by this utility model are as follows: 1. In this utility model, a fixed cutting component and a moving cutting component are set at the inlet port of the centrifugal water pump. The moving cutting component cooperates with the wave groove on the surface of the guide cone through a slider and a slider head to realize radial reciprocating cutting motion during rotation. It can actively cut flexible impurities such as water plants and fiber cables at the inlet port, significantly improving the pump body's anti-winding ability and anti-blocking performance.

[0023] 2. In this utility model, by arranging multiple side inlet holes on one side of the pump casing, some fluid is guided by negative pressure to carry impurities into the cutting zone. During the centrifugal pump's water suction process, the suction and cutting processes are completed simultaneously, which not only ensures the efficiency of liquid flow but also has the function of impurity treatment, effectively improving the pump's continuous working stability and service life under complex working conditions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a partial cross-sectional structural diagram of the pump casing according to an embodiment of the present invention; Figure 3 This is an exploded structural diagram of one embodiment of the present invention; Figure 4 This is a schematic diagram of the moving cutting component structure according to an embodiment of the present invention.

[0025] Figure label: 100. Pump casing; 110. Impeller; 120. Side inlet port; 200. Guide cone; 210. Reciprocating chute; 300. Fixed cutting part; 310. Fixed blade ring; 320. Fixing rod; 400. Moving cutting part; 410. Moving blade ring; 411. Connecting rod; 420. Slider; 430. Slider head. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features of the present utility model can be combined with each other.

[0027] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0028] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a centrifugal water pump with a cutting end at the water inlet.

[0029] Combination Figures 1-4 As shown, the present invention provides a centrifugal water pump with a cutting end at the inlet, including a pump casing 100, a guide cone 200, a fixed cutting component 300, a movable cutting component 400, and an impeller 110 rotatably installed inside the pump casing 100.

[0030] The pump housing 100 has an inlet port on one side, and multiple radially arranged side inlet holes 120 are opened on its outer periphery; a fixed cutter 300 and a movable cutter 400 are provided on the inner side of the inlet port. The fixed cutter 300 is fixed to the inner side of the inlet port by a fixing rod 320; the movable cutter 400 is slidably installed on the inner side of the inlet port and is arranged opposite to the fixed cutter 300 to form a cutting area.

[0031] The guide cone 200 is fixedly installed on the surface of the impeller 110 and is arranged coaxially with the impeller 110. The surface of the guide cone 200 is provided with multiple wave-shaped reciprocating grooves 210 to guide the reciprocating motion of the sliding component of the moving cutter 400. The ends of adjacent reciprocating grooves 210 are connected. The moving cutter 400 includes multiple concentrically arranged annular moving blade rings 410, which are connected and fixed to each other by connecting rods 411, forming a linkage structure.

[0032] In the embodiment, a plurality of sliders 430 are sleeved on the inner side of the moving blade ring 410. The sliders 430 are slidably sleeved in the wave-shaped reciprocating groove 210 on the surface of the guide cone 200 to achieve radial reciprocating motion as the guide cone 200 rotates. A slider 420 is connected to the outer periphery of the moving blade ring 410. The slider 420 slides up and down along a straight groove provided on the inner wall of the pump housing 100 inlet port to stabilize its motion trajectory and prevent rotational deviation.

[0033] Specifically, a linear groove is provided on the inner side of the liquid inlet port, which is arranged vertically on the surface of the impeller 110. The slider 420 is sleeved on the inner side of the linear groove to guide the slider 420 to reciprocate against the surface of the moving blade ring 410.

[0034] The fixed cutting component 300 includes multiple fixed blade rings 310, each fixed blade ring 310 is arranged in a concentric ring shape and fixed to the inside of the liquid inlet port by a fixing rod 320; each set of moving blade rings 410 and fixed blade rings 310 are arranged in a one-to-one correspondence and abut against each other to form a cutting contact surface, and each blade ring has a cutting edge on the contact surface for shearing flexible impurities.

[0035] like Figure 2 and Figure 4 As shown, the end face of the slide head 430 is designed in a hemispherical shape, and the surface of the slide head 430 and the inner surface of the reciprocating groove 210 of the guide cone 200 are hardened to improve sliding stability and wear resistance, and ensure cutting efficiency and service life during long-term operation.

[0036] The guide cone 200 has an overall conical structure with a gradually decreasing diameter at the end facing the pump casing 100. It is used to guide the liquid flow into the pump casing 100 and then spread it rapidly, which helps to improve the rectification effect and hydraulic stability of the fluid before it enters the impeller 110.

[0037] During pump startup, the impeller 110 drives the guide cone 200 to rotate at high speed. The reciprocating groove 210 on the surface of the guide cone 200 drives the sliding head 430 in the moving cutter 400 to reciprocate axially, thereby driving the moving blade ring 410 to perform the cutting action. At this time, the side inlet hole 120 generates negative pressure suction in the centrifugal zone, guiding flexible impurities such as aquatic plants into the space between the fixed blade ring 310 and the moving blade ring 410. After the impurities are cut and broken on the shearing surface, they are pumped into the impeller area along with the water flow, thus achieving simultaneous "liquid intake + cutting" and effectively improving the pump body's adaptability to impurity liquids.

[0038] Working principle and usage process of this utility model: This utility model combines the conventional water inlet structure of a centrifugal pump with an active-passive linkage cutting device added to the liquid inlet port. Its core is to use the moving blade ring 410 to achieve radial reciprocating shearing motion under the guidance of the reciprocating sliding groove 210 on the surface of the guide cone 200, so as to cooperate with the fixed blade ring 310 to complete the foreign object cutting function, thereby improving the pump's ability to pass through flexible foreign objects such as impurities and grass blades, and preventing blockage.

[0039] The specific principle is as follows: the impeller 110 drives the guide cone 200 to rotate at high speed, and the reciprocating groove 210 on its surface drives the moving cutting component 400 to perform a combined circumferential rotation and reciprocating sliding motion; the moving blade ring 410 on the moving cutting component 400 generates a relative reciprocating shearing action with the fixed blade ring 310 under the action of the reciprocating groove 210; during the liquid inlet process, the side liquid inlet hole 120 on the pump casing 100 generates a certain negative pressure to draw in part of the liquid flow, guiding impurities such as water plants and wool to the space between the fixed blade ring 310 and the moving blade ring 410, completing the shearing and crushing; the cut impurities are also drawn into the impeller 110 area and participate in the conventional centrifugal conveying process.

[0040] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A centrifugal water pump with a cutting function at the inlet end, characterized in that, include: The pump housing (100), guide cone (200), fixed cutter (300), movable cutter (400), and impeller (110) rotatably mounted inside the pump housing (100) are provided. One side of the pump housing (100) has an inlet port, and the outer periphery of the inlet port has several radially arranged side inlet holes (120). The fixed cutter (300) is fixed to the inner side of the inlet port, and the movable cutter (400) is slidably mounted to the inner side of the inlet port. The guide cone (200) is fixedly mounted on the surface of the impeller (110) and coaxially arranged with the impeller (110). The surface of the guide cone (200) has a wave-shaped... The reciprocating slide groove (210) includes a number of fixed blade rings (310) and a fixing rod (320), and each fixed blade ring (310) is arranged in a concentric ring shape and fixed to the inside of the liquid inlet port by the fixing rod (320). The moving blade ring (400) includes a number of concentrically arranged moving blade rings (410), and each moving blade ring (410) is provided with a connecting rod (411) for connecting adjacent moving blade rings (410). The moving blade ring (410) is provided with a slider (430) that slides on the surface of the reciprocating slide groove (210) on the inner side. The moving blade ring (410) is provided with a slider (420) on the outer periphery of the moving blade ring (410).

2. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The inner side of the liquid inlet port is provided with a straight groove arranged on the surface of the vertical impeller (110). The slider (420) is sleeved on the inner side of the straight groove to guide the slider (420) to reciprocate against the surface of the moving blade ring (410).

3. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The number of moving cutter rings (410) and fixed cutter rings (310) is several and arranged in a one-to-one correspondence. Each set of fixed cutter rings (310) and moving cutter rings (410) slides against each other, and each of the fixed cutter rings (310) and moving cutter rings (410) has a cutting edge on one side.

4. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The side inlet hole (120) is arranged radially opposite to each other between the fixed cutter ring (310) and the moving cutter ring (410).

5. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The reciprocating chute (210) is wavy and is evenly distributed around the outer periphery of the guide cone (200) in a circular direction. The ends of adjacent reciprocating chute (210) are connected. The number of reciprocating chute (210) corresponds one-to-one with the number of slide head (430).

6. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The guide cone (200) has a conical structure, and its diameter gradually decreases at the end away from the pump casing (100).

7. A centrifugal water pump with a cutting edge at the inlet end according to claim 1, characterized in that, The end face of the slide head (430) is hemispherical, and both the surface of the slide head (430) and the inner surface of the reciprocating groove (210) are hardened to improve the service life and wear resistance.

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