Sectional multi-stage centrifugal pump with double-suction impeller layout

Abstract

The utility model discloses a sectional type multi-stage centrifugal pump with a double-suction impeller layout, which relates to the technical field of water pumps and comprises a main shaft and a pump body, and two ends of the main shaft are connected with the pump body through bearings. The pump body comprises a water inlet section, water pumping sections and a water outlet section, double-suction impellers arranged on the main shaft in a sleeving mode are arranged in the water inlet section, the water pumping sections and the water outlet section, a water inlet is formed in one end of the water inlet section, and the other end of the water inlet section is connected with the water pumping sections through flow guide pipes. One end of the water outlet section is connected with the water pumping section through a flow guide pipe; the effective sealing surface between high pressure and low pressure is long, and the leakage rate is very small; the impeller is wide in runner, large in design flow and capable of adapting to various complex working conditions; the specific speed and the efficiency are high; due to double suction inlets, the net positive suction head NPSHr is low, and the effective suction stroke is high; a balancing device or a throttling device is reduced, the efficiency is improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water pumps, in particular to a segmented multi-stage centrifugal pump with a double-suction impeller layout. Background Art

[0002] Since the emergence of segmental multi-stage centrifugal pumps, most of them use a single-suction impeller or a first-stage double-suction impeller plus a single-suction impeller structure, which has a small flow rate and low efficiency.

[0003] The balancing device relies on leakage flow to maintain a pressure difference between the front and rear ends of the balancing device to offset the axial force. This results in large leakage flow, low efficiency, and easy wear.

[0004] Relying on the positive and negative layout of the impeller to offset the axial force has disadvantages. A single-stage pump cannot balance the axial force, and the pressure difference before and after the throttling device in the middle of the rotor reaches half of the head. The leakage flow is large, and the vibration of the pump will be very large if there is a slight wear.

[0005] It cannot meet the requirements of large flow and high head working conditions.

[0006] Therefore, a segmented multi-stage centrifugal pump with a double-suction impeller layout has become an urgent problem to be solved. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a segmented multi-stage centrifugal pump with a double-suction impeller layout to solve the problems of large flow, high head and axial force difference.

[0008] In order to solve the above technical problems, the technical solution provided by the present invention is as follows: a segmented multi-stage centrifugal pump with a double-suction impeller layout, comprising a main shaft and a pump body, wherein both ends of the main shaft are connected to the pump body through bearings;

[0009] The pump body includes a water inlet section, a pumping section and a water outlet section. The water inlet section, the pumping section and the water outlet section are all provided with a double-suction impeller sleeved on the main shaft. One end of the water inlet section is provided with a water inlet, and the other end is connected to the pumping section through a guide pipe. There are several pumping sections and they are arranged in sequence and connected through the guide pipe. One end of the water outlet section is connected to the pumping section through a guide pipe, and the other end is provided with a water outlet.

[0010] Furthermore, a sealing box body is provided on the side of the water inlet section close to the bearing and the side of the water outlet section close to the bearing.

[0011] Furthermore, the two sides of the pumping segment are symmetrically arranged with guide bodies.

[0012] Furthermore, a split baffle is provided on one side of the guide body, and the split baffle is in contact with and cooperates with the double-suction impeller.

[0013] Furthermore, the water inlet section, the water pumping section and the middle portion of the water outlet section are all connected to the main shaft via a throttling sleeve.

[0014] Furthermore, there are two pumping segments, which are connected via a guide pipe.

[0015] The advantages of this utility model compared with the prior art are:

[0016] 1. The effective sealing surface between high and low pressure is long, and the leakage is very small;

[0017] 2. The impeller has wide flow channel and large design flow, which can adapt to various complex working conditions;

[0018] 3. Large specific speed and high efficiency;

[0019] 4. Double suction inlet, low NPSHr and high effective suction head;

[0020] 5. It reduces the balancing device or throttling device, improves efficiency and increases service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The utility model is a schematic cross-sectional structure diagram of a segmented multi-stage centrifugal pump with a double-suction impeller layout.

[0022] As shown in the figure: 1. Main shaft, 2. Bearing, 3. Water inlet section, 4. Pumping section, 5. Water outlet section, 6. Double-suction impeller, 7. Water inlet, 8. Guide pipe, 9. Water outlet, 10. Sealing box body, 11. Guide body, 12. Split baffle, 13. Throttle sleeve. DETAILED DESCRIPTION

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside", "vertical", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0024] In the description of this utility model, "first feature" or "second feature" may include one or more of these features. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features being described. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of these features.

[0025] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0026] The following is a further detailed description of a segmented multi-stage centrifugal pump with a double-suction impeller layout according to the present invention in conjunction with the accompanying drawings.

[0027] Combined with attachment Figure 1 The specific implementation process of the utility model of a segmented multi-stage centrifugal pump with a double-suction impeller layout is as follows:

[0028] A segmented multistage centrifugal pump with a double-suction impeller layout comprises a main shaft 1 and a pump body. The main shaft 1 is connected to the pump body at both ends via bearings 2, ensuring stable operation of the main shaft 1. The pump body is divided into an inlet section 3, a pumping section 4, and a discharge section 5. Each of these sections houses a double-suction impeller 6 that fits over the main shaft 1, enabling bidirectional water suction and improving the pump's suction efficiency and flow rate.

[0029] One end of the inlet section 3 is equipped with an inlet 7 for introducing the liquid to be transported; the other end is connected to the pumping section 4 via a guide pipe 8. Several pumping sections 4 are provided, arranged in sequence and connected by guide pipes 8, forming a multi-stage pumping structure. One end of the outlet section 5 is connected to the last pumping section 4 via a guide pipe 8, and the other end is equipped with an outlet 9 for discharging the liquid after multi-stage pressurization.

[0030] In order to improve the sealing performance of the pump, the utility model is provided with a sealing box 10 on the side of the water inlet section 3 close to the bearing 2 and the side of the water outlet section 5 close to the bearing 2, which effectively prevents liquid leakage and ensures the normal operation of the pump.

[0031] The two sides of the pumping segment 4 are symmetrically arranged with guide bodies 11 for guiding the flow of liquid, reducing flow resistance and improving the working efficiency of the pump.

[0032] A split baffle 12 is provided on one side of the guide body 11. The split baffle 12 contacts and cooperates with the double-suction impeller 6 to further guide the flow of liquid and stabilize the operation of the impeller.

[0033] The middle parts of the water inlet section 3, the water pumping section 4 and the water outlet section 5 are all connected to the main shaft 1 through a throttling sleeve 13. The throttling sleeve 13 not only plays a fixing role, but also effectively reduces liquid leakage and improves the sealing performance of the pump.

[0034] As a preferred solution, the present invention has two pumping segments 4 , which are connected by a guide pipe 8 to form a two-stage pumping structure, which can meet most application requirements while maintaining the compactness and economy of the pump.

[0035] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A segmented multistage centrifugal pump with a double-suction impeller layout, characterized by: It comprises a main shaft (1) and a pump body, wherein both ends of the main shaft (1) are connected to the pump body via bearings (2); The pump body comprises a water inlet section (3), a water pumping section (4) and a water outlet section (5); the water inlet section (3), the water pumping section (4) and the water outlet section (5) are all provided with a double-suction impeller (6) sleeved on the main shaft (1); one end of the water inlet section (3) is provided with a water inlet (7), and the other end is connected to the water pumping section (4) through a guide pipe (8); the water pumping section (4) is provided with a plurality of impellers which are arranged in sequence and connected through the guide pipe (8); one end of the water outlet section (5) is connected to the water pumping section (4) through the guide pipe (8), and the other end is provided with a water outlet (9).

2. The segmented multi-stage centrifugal pump with a double-suction impeller layout according to claim 1, characterized in that: A sealing box body (10) is provided on the side of the water inlet section (3) close to the bearing (2) and on the side of the water outlet section (5) close to the bearing (2).

3. The segmented multi-stage centrifugal pump with a double-suction impeller layout according to claim 2, characterized in that: The two sides of the pumping segment (4) are symmetrically arranged with guide bodies (11).

4. The segmented multi-stage centrifugal pump with a double-suction impeller layout according to claim 3, characterized in that: A split baffle (12) is provided on one side of the flow guide (11), and the split baffle (12) is in contact with and cooperates with the double-suction impeller (6).

5. The segmented multi-stage centrifugal pump with a double-suction impeller layout according to claim 4, characterized in that: The middle parts of the water inlet section (3), the water pumping section (4) and the water outlet section (5) are all connected to the main shaft (1) via a throttling sleeve (13).

6. The segmented multi-stage centrifugal pump with a double-suction impeller layout according to claim 5, characterized in that: There are two pumping sections (4), and the two pumping sections (4) are connected via a flow guide pipe (8).

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