Double-suction full-symmetrical multi-stage pump

Abstract

The utility model discloses a kind of double-suction full-symmetry multistage pumps, including pump shell, shaft and the double-suction impeller being set in pump shell, pump shell top surface is equipped with top cover, two sides are equipped with liquid inlet flange and liquid outlet flange, pump shell inside is equipped with guide spin cavity, centrifugal rotation cavity and cyclone pass, guide spin cavity is communicated with liquid inlet flange, cyclone pass is communicated with liquid outlet flange, guide spin cavity and centrifugal rotation cavity are symmetrically arranged and are arranged in pairs. Double-suction impeller includes integrally-formed rotating seat and the spiral blade being set in its two sides, blade outside connects spin cover, and spin cover is equipped with liquid inlet. The multistage pump structure is symmetrical, liquid can enter simultaneously by two sides and be evenly distributed to double-side blade, axial force can be automatically offset when pump operates, with the advantages of flow passage optimization, high efficiency, good dynamic balance, stable operation, suitable for large-flow high-lift delivery scene.

Description

Technical Field

[0001] This utility model relates to the field of water pump technology, specifically a double-suction fully symmetrical multistage pump. Background Technology

[0002] Multistage centrifugal pumps are widely used in industrial water transmission, urban water supply, boiler feedwater and petrochemical fields. Especially under high head and large flow conditions, double-suction pumps have become one of the important equipment types due to their good hydraulic performance and structural symmetry.

[0003] In existing technologies, traditional double-suction pumps often employ single-sided suction or asymmetrical structures. Their internal flow guiding structures and impeller layouts often suffer from the following typical problems:

[0004] In most traditional double-suction pump structures, although the impeller has the ability to suck liquid on both sides, the guide vortex chamber and centrifugal rotating chamber inside the pump casing are mostly arranged asymmetrically, resulting in an unbalanced liquid flow path. This makes it impossible to effectively counteract the axial force, affecting the pump's operational stability. Especially under high load or high speed operating conditions, it is very easy to generate vibration and noise, reducing the equipment's lifespan.

[0005] Furthermore, the impellers of commonly used double-suction pumps are usually modular, and some products have uneven blade arrangement or unreasonable angle design, which can cause uneven fluid loading, dynamic imbalance, and reduced operational stability. In addition, the lack of effective axial sealing and compact structural design makes the overall equipment prone to leakage, high noise, and other problems, resulting in high maintenance costs.

[0006] In summary, existing dual-suction pump technology has certain technical bottlenecks in terms of structural symmetry, axial force balance, rational flow channel arrangement, and impeller dynamic balance, making it difficult to meet the engineering requirements of high efficiency and stable operation. Therefore, there is an urgent need for a dual-suction fully symmetrical multistage pump with optimized structure, balanced flow, good symmetry, and high efficiency to improve its overall performance. Utility Model Content

[0007] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, the technical solution adopted by this utility model is as follows: a double-suction fully symmetrical multistage pump, comprising: a pump casing, a shaft, and a double-suction impeller rotatably mounted inside the pump casing. A top cover is fixedly installed on the top surface of the pump casing. Inlet flanges and outlet flanges are provided on both sides of the pump casing. A guide vortex chamber and a vortex channel, respectively communicating with the inlet and outlet flanges, are provided inside the pump casing. A centrifugal rotating chamber is provided inside the pump casing, communicating with the outlet flange through the vortex channel. There are two guide vortex chambers and two centrifugal rotating chambers, symmetrically arranged, located on both sides of the pump casing cavity. The double-suction impeller includes a rotor and blades fixed to both sides of the rotor. A cap is fixedly connected to one side of each blade, and an inlet port communicating with the guide vortex chamber is provided on the surface of the cap. Through the double-suction symmetrical structural design, liquid can simultaneously enter the impeller center from both sides of the pump body, effectively reducing axial force and improving the stability of pump operation.

[0009] In one possible implementation, the double-suction impeller is fixedly sleeved on the surface of the shaft and rotatably mounted inside the pump casing and top cover, and a mechanical seal fixed to the surface of the pump casing is sleeved on the surface of the shaft. By setting up an axial sealing assembly, a liquid seal between the rotating shaft and the outside is ensured, preventing leakage and improving equipment safety.

[0010] In one possible implementation, the two centrifugal rotating chambers are arranged parallel to each other, and the blades on both sides of the rotor are arranged correspondingly to the centrifugal rotating chambers. By optimizing the spatial fit between the centrifugal rotating chambers and the impeller blades, a smooth liquid flow path is ensured, effectively reducing hydraulic losses.

[0011] In one possible implementation, the dual-suction impeller is a one-piece molded structure, with both sides of the rotor tapering towards the inlet end in a conical shape. The one-piece molded structure improves overall coaxiality and dynamic balance, while the conical tapering design improves liquid introduction conditions and enhances pump suction capacity.

[0012] In one possible implementation, the blades are arranged in a helical direction, and several blades are evenly distributed circumferentially on the surface of the rotor. This helical and equidistant blade design enhances fluid shear efficiency, achieves high-efficiency pressurization, and reduces flow fluctuations.

[0013] In one possible implementation, both the guide cavity and the swirling channel are arranged in a helical tangential direction, with opposite rotation directions. This helical flow-guiding design with opposite rotation directions improves the liquid momentum conversion path, enhancing flow stability and energy utilization efficiency.

[0014] The beneficial effects achieved by this utility model are as follows:

[0015] 1. In this utility model, the double-suction impeller is symmetrically arranged, and both the guide swirl chamber and the centrifugal rotating chamber are bidirectional symmetrical structures, making the pump body structure symmetrical as a whole. Liquid is simultaneously drawn in from both sides and evenly distributed to the blades on both sides, which can effectively balance the axial force and significantly improve the stability and efficiency of the pump during operation. It is suitable for high flow and high head conditions.

[0016] 2. In this invention, the swirl chamber and the swirl channel are arranged in a helical tangential direction with opposite rotations, effectively optimizing the flow path of the liquid within the pump chamber, reducing fluid turbulence and energy loss, and improving the pump's hydraulic efficiency. Simultaneously, by setting multiple symmetrical blades and optimizing their helical angle and uniform distribution, the liquid pressurization capacity and overall dynamic balance performance are further enhanced. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the pump casing and double-suction impeller structure according to one embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the pump casing according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of a double-suction impeller structure according to an embodiment of the present invention.

[0021] Figure label:

[0022] 100. Pump casing; 110. Top cover; 120. Inlet flange; 130. Outlet flange; 121. Swirl chamber; 131. Centrifugal rotating chamber; 132. Swirl channel;

[0023] 200. Shaft; 210. Mechanical seal;

[0024] 300, Double suction impeller; 310, Rotary seat; 320, Blade; 330, Screw cap; 331, Liquid inlet. Detailed Implementation

[0025] 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.

[0026] It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this invention.

[0027] The following describes some embodiments of the present invention with reference to the accompanying drawings, providing a double-suction fully symmetrical multistage pump.

[0028] Combination Figures 1-4 As shown, the present invention provides a double-suction fully symmetrical multistage pump, including a pump casing 100, a shaft 200, and a double-suction impeller 300.

[0029] The pump casing 100 is generally rectangular in shape and is made of cast metal. It is used to house the internal fluid components and rotating parts. A top cover 110 is fixedly installed on its top surface. The top cover 110 is connected to the pump casing 100 by screws and a sealing gasket is provided to ensure airtightness. The pump casing 100 has an inlet flange 120 and an outlet flange 130 on its two sides, respectively. The inlet flange 120 is used to connect to the liquid source pipeline, and the outlet flange 130 is used to connect to the outlet pipeline.

[0030] The pump casing 100 has a swirl chamber 121 communicating with the inlet flange 120 and a swirl channel 132 communicating with the outlet flange 130. The swirl chamber 121 guides liquid from the inlet flange 120 into the impeller center, and its structure is helically tangentially distributed to facilitate the formation of swirl when the liquid is introduced. The swirl channel 132 guides the pressurized liquid from the centrifugal chamber 131 to the outlet flange 130. The swirl channel 132 is also helically tangentially arranged, but its direction of rotation is opposite to that of the swirl chamber 121, which improves flow stability and resistance to disturbances. Two centrifugal chambers 131 are located between the swirl chamber 121 and the swirl channel 132, arranged symmetrically on both sides of the inner cavity of the pump casing 100. The two centrifugal chambers 131 are parallel to each other and are used to accommodate the pressurized liquid delivered from both sides of the double-suction impeller 300.

[0031] The double-suction impeller 300 is the core power component of this invention, installed inside the pump casing 100. It includes a central rotating base 310, which is an integrally formed structure with tapered ends. The tapered end faces the inlet 331, facilitating the guidance of liquid into the blade area. Several blades 320 are symmetrically mounted on both sides of the rotating base 310, arranged in a helical direction to create a centrifugal force field. Multiple blades 320 are evenly distributed circumferentially on the surface of the rotating base 310, improving liquid delivery efficiency and dynamic balance performance. A cap 330 is fixedly connected to the outer side of each blade 320. The cap 330 has an inlet 331 on its surface, which communicates with the guide cavity 121, allowing liquid to enter the central region of the impeller.

[0032] The double-suction impeller 300 is integrally mounted on the outer surface of the shaft 200 through an inner hole, and the shaft 200 passes through the central axis of the double-suction impeller 300. Both ends of the shaft 200 are rotatably connected to the bearing seats of the pump casing 100 and the top cover 110 respectively via rolling bearings, achieving efficient rotation. A mechanical seal 210 is fitted onto the surface of the shaft 200, and the mechanical seal 210 is fixedly installed in the sealing groove of the pump casing 100 to prevent fluid leakage inside the pump.

[0033] In operation, this invention uses an external drive motor to rotate the shaft 200. The inlet flange 120 receives external liquid, which flows into the inlet port 331 through the guide vortex chamber 121 and is then simultaneously drawn in by both sides of the double-suction impeller 300. The blades 320 apply centrifugal force to the liquid, causing it to be thrown into the left and right centrifugal rotating chambers 131, and then guided through the vortex channels 132 to the outlet flange 130 for discharge.

[0034] The above-described structure and layout ensure that this utility model has advantages such as structural symmetry, stable operation, uniform fluid distribution, and small pressure difference, making it suitable for various high-requirement liquid transportation applications.

[0035] Working principle and usage process of this utility model:

[0036] This utility model relates to a structurally optimized double-suction fully symmetrical multistage pump, which mainly achieves efficient and stable liquid transportation through the symmetrical arrangement of double-suction impellers. Its basic working principle is as follows:

[0037] Liquid inlet and primary flow guidance: Liquid enters the guide vortex chamber 121, which is connected to the liquid inlet flanges 120 on both sides of the pump casing. Since the guide vortex chamber has a helical tangential structure, it helps the liquid generate rotational kinetic energy.

[0038] Bidirectional liquid suction and impeller pressurization: After passing through the guide vortex chamber 121, the liquid enters the double-suction impeller 300 mounted on the shaft 200 through two symmetrically arranged inlets 331. The impeller rotates at high speed driven by the motor, and the helical blades 320 on both sides apply centrifugal force to the liquid, thereby achieving pressurization.

[0039] Energy conversion and liquid discharge: The pressurized liquid enters the centrifugal rotating chamber 131 from both sides of the rotating base 310, and is discharged to the liquid outlet flanges 130 on both sides of the pump casing through the swirling channel 132 connected to it, achieving stable liquid discharge. The swirling channel and the guide swirling chamber rotate in opposite directions, which improves the stability of liquid flow and the pressure control effect.

[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 double-suction fully symmetrical multistage pump, characterized in that, include: The pump casing (100), shaft (200), and double-suction impeller (300) rotatably mounted inside the pump casing (100) are provided. A top cover (110) is fixedly installed on the top surface of the pump casing (100). An inlet flange (120) and an outlet flange (130) are provided on both sides of the pump casing (100). A vortex guide cavity (121) and a vortex channel (132) communicating with the inlet flange (120) and the outlet flange (130) are provided inside the pump casing (100). A centrifugal rotating cavity (131) is provided inside the pump casing (100). 131) It is connected to the outlet flange (130) through the swirl channel (132). There are two swirl chambers (121) and two centrifugal rotating chambers (131) arranged symmetrically. The two swirl chambers (121) are arranged on both sides of the inner cavity of the pump casing (100). The double suction impeller (300) includes a rotating seat (310) and blades (320) fixed on both sides of the rotating seat (310). A cap (330) is fixedly connected to one side of the blade (320). The surface of the cap (330) is provided with an inlet (331) that communicates with the swirl chamber (121).

2. The double-suction fully symmetrical multistage pump according to claim 1, characterized in that, The double suction impeller (300) is fixedly sleeved on the surface of the shaft (200) and rotatably mounted on the inside of the pump casing (100) and the top cover (110). The surface of the shaft (200) is sleeved with a mechanical seal (210) fixed to the surface of the pump casing (100).

3. The double-suction fully symmetrical multistage pump according to claim 1, characterized in that, The two centrifugal rotating chambers (131) are arranged in parallel to each other, and the blades (320) on both sides of the rotating seat (310) are arranged corresponding to the centrifugal rotating chambers (131).

4. The double-suction fully symmetrical multistage pump according to claim 1, characterized in that, The double suction impeller (300) is an integrally formed structure, and the two sides of the rotating seat (310) are tapered and gradually narrow towards one end of the liquid inlet (331).

5. The double-suction fully symmetrical multistage pump according to claim 1, characterized in that, The blades (320) are arranged in a spiral direction, and a number of the blades (320) are evenly distributed in a circumferential direction on the surface of the turntable (310).

6. The double-suction fully symmetrical multistage pump according to claim 1, characterized in that, The swirl chamber (121) and the swirl channel (132) are both arranged in a spiral tangential direction, and the swirl chamber (121) and the swirl channel (132) rotate in opposite directions.

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