Vertical multi-stage rotary shell pump

Abstract

A vertical multi-stage rotary shell pump is composed of a pump body, a rotary component, a supporting seat and an inlet and outlet section. And the vertical motor shaft is fixedly connected with a plurality of stages of rotors which are horizontally arranged and are connected in series in the pump body through a coupler. The rotor close to the motor is composed of a rotor cover and an impeller, the other rotors are composed of impellers, and each rotor is provided with a hollow rotor cavity. And the liquid inlet pipe at the lower end of the impeller farthest from the motor is arranged in the supporting seat. A static receiving pipe with a suction inlet is horizontally arranged in each rotor cavity, and a static inverted-L-shaped main receiving pipe with a suction inlet is arranged in the rotor cavity close to the motor, sequentially penetrates out of the impeller and the receiving pipe downwards and is communicated with a liquid outlet of the supporting seat. The receiving pipe and the main receiving pipe are fixed together, the main receiving pipe is fixed in the supporting seat, and the supporting seat is fixed on the pump body partition plate. The lower end of the supporting base is connected with the inlet-outlet section. An auxiliary impeller is fixedly connected outside the impeller liquid inlet pipe, and an elastic gland is arranged on the auxiliary impeller.

Description

Technical Field

[0001] This invention relates to a fluid pump, and more particularly to a vertical multistage vortex pump. Background Technology

[0002] Pumps are essential equipment for transporting liquids in industries such as petroleum, chemical, fertilizer, metallurgy, mining, carbon black, and papermaking.

[0003] The high number of stages, high failure rate, low efficiency, and difficulty in maintenance are major drawbacks of multistage centrifugal pumps.

[0004] Reducing pump failure rates, improving pump reliability, and saving maintenance costs are the wishes of pump users.

[0005] There are currently no vertical multistage vortex pumps. Summary of the Invention

[0006] The purpose of this invention is to provide a vertical multistage vortex pump, which aims to solve the problems of high failure rate, low efficiency and difficult maintenance of multistage centrifugal pumps.

[0007] The technical solution adopted in this invention is:

[0008] A vertical multistage vortex pump consists of three parts: a pump body, rotating components and a support base, and inlet and outlet sections. A vertical motor shaft is fixedly connected within the pump body to horizontally arranged multistage rotors arranged in series via a coupling. The rotor closest to the motor consists of a rotor cover and an impeller, while the remaining rotors consist of impellers. Each rotor has a hollow rotor cavity. The inlet pipe at the lower end of the impeller furthest from the motor sits within the support base. A stationary receiving pipe with an opening for suction is horizontally arranged within each rotor cavity. A stationary, inverted L-shaped main receiving pipe with an opening for suction is located within the rotor cavity closest to the motor, extending downwards through the impeller, through the receiving pipe, and communicating with the liquid outlet of the support base. The receiving pipe and the main receiving pipe are fixed together, and the main receiving pipe is fixed within the support base, which is fixed to a partition plate on the pump body. The lower end of the support base is connected to the outlet section. A secondary impeller is fixedly connected to the outside of the inlet pipe, and an elastic cap is placed on top of the secondary impeller, which is fixed to the support base.

[0009] The positive effects of this invention are: 1. No dynamic seal, greatly reducing the pump failure rate; 2. No leakage; 3. Pump maintenance only requires removing the rotating parts and support base, making maintenance convenient, requiring fewer maintenance personnel, shortening maintenance time, and reducing maintenance costs; 4. Improved pump efficiency. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the present invention. 1-Pump body 2-Coupling 3-Rotor cover 4-Impeller 5-Inlet pipe 6-Support base 7-Main receiving pipe 8-Receiving pipe 9-Elastic gland 10-Auxiliary impeller 11-Inlet / outlet section Figure 2This is a schematic diagram of a liquid flow channel. Figure 3 This is a structural diagram of the three parts of the pump. Figure 4 It consists of an impeller assembly connected in series and a receiver tube assembly connected in series. Detailed Implementation

[0011] The present invention will be further described below through embodiments and in conjunction with the accompanying drawings:

[0012] like Figure 3 As shown, a vertical multistage vortex pump consists of three parts: a pump body, rotating components and a support base, and inlet and outlet sections. Figure 1 As shown, the vertical motor shaft is fixedly connected to a horizontally positioned rotor cover 3 within the pump body 1 via a coupling 2. The lower end of the rotor cover 3 is connected to a horizontally positioned impeller 4, which are connected in series. The inlet pipe 5 at the lower end of the impeller 4 furthest from the motor sits within a support base 6, which is fixed to a partition within the pump body 1. Within the rotor cavity formed by the impellers 4, a stationary receiving pipe 8 with a suction inlet is horizontally positioned. Within the rotor cavity formed by the rotor cover 3 and the impellers 4, a stationary, inverted L-shaped main receiving pipe 7 with a suction inlet is positioned, extending downwards through the impellers 4, the receiving pipe 8, and the inlet pipe 5, connecting to the liquid outlet of the support base 6. The support base 6 is connected to the inlet / outlet section 11 via pipes. A secondary impeller 10 is fixed outside the inlet pipe 5, and an elastic pressure cap 9 is fixed to the support base 6 on top of the secondary impeller 10.

[0013] When in use, the liquid flows in the following direction: Figure 2 As indicated by the arrow, liquid flows from the main receiving pipe 8 and the external inlet pipe 5 into the impeller 4, which is furthest from the motor. Because the motor drives the rotor cover 3 and impeller 4 to rotate, the liquid gains high-speed kinetic energy within the impeller 4's flow channel and enters the rotor cavity. Within the rotor cavity, the receiving pipe 8 converts the liquid's kinetic energy into pressure energy, causing the liquid to flow into the next stage impeller 4. Within the rotor cavity formed by the rotor cover 3 and impeller 4, the main receiving pipe 7 allows the liquid to flow out along the outlet channel. The sealing fluid below the impeller assembly within the pump body is pressurized by the auxiliary impeller 10 and flows into the pump inlet channel.

[0014] During maintenance, turn off the power, close the pump inlet and outlet valves, drain the liquid from the pump, remove the front and rear covers of the pump body, unscrew the inlet and outlet connection pipes, loosen the motor coupling, use the maintenance frame to hold the rotating parts and support base, remove the fixing bolts of the support base, and lower the rotating parts and support base by 30 mm to move them out of the pump body through the partition notch.

Claims

1. A vertical multistage vortex pump, comprising a pump body, rotating components and a support base, and inlet and outlet sections. A vertical motor shaft is fixedly connected within the pump body to horizontally arranged multistage rotors in series via a coupling. The rotor closest to the motor consists of a rotor cover and an impeller, while the remaining rotors consist of impellers. Each rotor has a hollow rotor cavity. The inlet pipe at the lower end of the impeller furthest from the motor sits within the support base. A stationary receiving pipe with a suction inlet is horizontally arranged within each rotor cavity. A stationary, inverted L-shaped main receiving pipe with a suction inlet is arranged within the rotor cavity closest to the motor, extending downwards through the impeller and the receiving pipe and communicating with the liquid outlet of the support base. The receiving pipe is fixed together with the main receiving pipe, which is fixed within the support base. The support base is fixed to a partition plate of the pump body. The lower end of the support base is connected to the inlet and outlet sections. An auxiliary impeller is fixedly connected to the outside of the impeller inlet pipe. An elastic cap is placed on top of the auxiliary impeller and fixed to the support base.

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