CN108626130A - A kind of high-temperature melting salt pump of the double outlet double volute pump bodies of band - Google Patents

Abstract

The invention belongs to the field of fluid machinery and specifically discloses a high-temperature molten salt pump with double outlets and double volute casings. The high-temperature molten salt pump is mainly composed of five parts: double-inlet water inlet section, centrifugal impeller, double-outlet pump body, double-helical rectifier tube, and bearing body. For the problem of unbalanced axial force, the spiral rectifier tube guides the direction of fluid flow downward, and is connected to the pumping pipeline through an automatic coupling device, which reduces the difficulty of installing the pump station, improves the operability of the high-temperature pump, and reduces the cost of the high-temperature molten salt pump. technical difficulty. The invention has simple structure, easy installation and disassembly, and can ensure long-term reliable operation of the high temperature pump.

Description

A high temperature molten salt pump with double outlet and double volute pump body

technical field

The invention belongs to the field of fluid machinery, and specifically provides a high-temperature molten salt pump with double outlets and double volute casings, which is a high-temperature molten salt pump that can balance radial forces and is easy to install and maintain on the pump station foundation.

Background technique

At present, molten salt is a kind of molten salt with excellent physical properties, which is solid at room temperature. Molten salt has high conductivity, wide temperature range, low vapor pressure, large heat capacity, and stable chemical properties. These advantages make molten salt widely used as heat storage material and heat transfer medium. High temperature molten salt pump is a delivery pump for molten salt medium, which is widely used in chemical industry, nuclear energy and solar energy fields. In the field of chemical industry, molten salt pumps are generally used in the preparation process of chemical products such as melamine, salt making, alkali making or urea, and transport nitrate, caustic soda and other substances with a temperature between 400 and 460 °C; in the future advanced nuclear energy and photothermal power plants Among them, the melt pump is mainly used for the transportation of heat storage and heat transfer medium, which transports mixed molten salts with high heat storage capacity and excellent thermal conductivity. The temperature of the medium can be as high as 700 ° C, or even exceed 1000 ° C. For a long time, most domestic molten salt pumps used in chemical and metallurgical engineering have relied on imports. Due to the high operating temperature, the maintenance cycle of molten salt pumps is relatively long. Once a failure occurs, it will bring significant economic losses to production.

Contents of the invention

Aiming at the problems existing in the prior art, the present invention provides a high-temperature molten salt pump with double outlets and double volute casings. Since molten salt is used as a heat storage and heat transfer medium, its working temperature can be as high as 700°C, or even over 1000°C, which requires high technical requirements. The pump body adopts a centrally symmetrical double outlet structure, and the spiral rectifier tube guides the direction of fluid flow downward. , and connected to the pumping pipeline through an automatic coupling device, which solves the problem of unbalanced radial force, and the foundation of the pump station is easy to install and disassemble, and the molten salt pump can be directly installed and disassembled without affecting other pipelines The normal operation of the pump solves the problem that the maintenance cycle of the high temperature molten salt pump is too long.

A high-temperature molten salt pump with double outlets and double volute pump body, including double inlet water inlet section, centrifugal impeller, double outlet pump body, double helical rectifier tube, bearing body,

The high-temperature molten salt pump with double outlet and double volute pump body is a centrifugal submerged pump, and the double inlet section is provided with radially symmetrical double inlets; the double outlet pump body is a double outlet quasi-spiral volute , the double outlet pump body is equipped with a centrally symmetrical double outlet b; the double helical rectifier tube is a three-way structure, and its inlet section is two centrally symmetrical spiral rectifying structures, and the two spiral rectifying structures converge to the double helical rectifying tube straight out For water pipes, an automatic coupling connection structure a is provided under the flange of the straight outlet pipe of the double-helix rectifier;

In the high-temperature molten salt pump with double outlets and double volute pump body, the double inlet water inlet section of the pump and the straight outlet pipe of the double helical rectifier tube are all on the lower side of the pump body, and the inlet of the double inlet water inlet section is a free fluid inlet. , the flow direction of the double helix rectifier in the straight outlet pipe is downward; the centrifugal impeller is placed inside the double outlet pump body, and guide vanes are set between the centrifugal impeller and the double outlet pump body; the two inlet ends of the double helix rectifier pipe The double outlet ports of the double outlet pump body are respectively connected by bolts, and the double inlet water inlet section is placed under the double outlet pump body and connected by bolts; the double inlet section of the double inlet water inlet section is located between the straight outlet pipe of the double helix rectifier pipe above.

The straight outlet pipe of the double-helix rectifier tube is connected to the pumping pipeline through an automatic coupling mechanism c, that is, the high-temperature molten salt pump is directly inserted into the pumping pipeline along the guide rail for automatic coupling connection.

In the double-inlet water inlet section, a partition d is provided at the position of the symmetrical plane of the two inlets.

When the two helical rectification structures converge to the double helix rectifier pipe straight out of the water pipe, a partition 2e is provided at the center of the confluence.

In the high-temperature molten salt pump with double outlets and double volute casings, the helix angle of the double helical rectifier tubes is 70-90 degrees to ensure that the positions of the double inlet water inlet section and the double helical rectifier tubes do not interfere with each other. And the double inlet section of the double inlet water inlet section is parallel to the center line of the double outlet of the double outlet pump body.

The beneficial effects of the present invention are as follows:

On the premise of not affecting the hydraulic characteristics of the pump, the invention can well solve the problems of unbalanced radial force of the high-temperature molten salt pump, difficult disassembly when a fault occurs, and long maintenance period.

Description of drawings

Fig. 1 is a structural principle diagram of a high-temperature molten salt pump with double outlets and double volute pump body of the present invention;

Fig. 2 is the structural representation of double outlet pump body of the present invention;

Fig. 3 is a schematic diagram of the working principle of a high-temperature molten salt pump with a double-outlet double-volute pump body of the present invention;

Explanation of reference signs:

1. Double inlet water inlet section, 2. Centrifugal impeller, 3. Double outlet pump body, 4. Double helical rectifier tube, 5. Bearing body, 6. Pumping pipeline, 7. Molten salt heating tank, a. Automatic coupling Connection structure, b. Double outlet, c. Automatic coupling mechanism, d. Partition one, e. Partition two.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

Fig. 1 to Fig. 3 are schematic structural diagrams of a high-temperature molten salt pump with double outlets and double volute casings according to the present invention.

The present invention provides a high temperature molten salt pump with double outlets and double volute casings. The high temperature molten salt pump includes a double inlet water inlet section 1, a centrifugal impeller 2, a double outlet pump body 3, a double helical rectifier tube 4, Bearing body 5, guide vanes are placed between the centrifugal impeller 2 and the double outlet pump body 3, the high temperature molten salt pump with double outlet and double volute pump body is a centrifugal submerged pump, the double inlet water inlet section 1 There are radially symmetrical double inlets on the top; the double outlet pump body 3 is a double outlet quasi-spiral volute, and the double outlet pump body 3 is provided with a centrally symmetrical double outlet b; the double spiral rectifier tube 4 is a three-way structure, and its The inlet section is two spiral rectification structures symmetrical to the center, and the two spiral rectification structures converge to the straight water outlet pipe of the double helix rectifier pipe 4, and an automatic coupling connection structure a is provided under the flange of the straight water outlet pipe of the double helix rectifier pipe 4;

In the high-temperature molten salt pump with double outlets and double volute pump body, the pump double inlet water inlet section 1 and the double helical rectifier pipe 4 straight outlet pipes are all on the lower side of the pump body, and the inlet of the double inlet water inlet section 1 is The fluid is freely imported, and the flow direction of the double helical rectifier tube 4 in the straight outlet pipe is downward; the centrifugal impeller 2 is placed inside the double outlet pump body 3, and guide vanes are set between the centrifugal impeller 2 and the double outlet pump body 3; The two inlet ends of the spiral rectifier tube 4 are respectively connected with the double outlet ends of the double outlet pump body 3 by bolts, and the double inlet water inlet section 1 is placed under the double outlet pump body 3 and connected by bolts; the double inlet water inlet section 1 The double inlet section is above the straight outlet pipe of the double helix rectifier pipe 4.

The straight outlet pipe of the double-helix rectifier 4 is connected to the pumping pipeline 6 through an automatic coupling mechanism c, that is, the high-temperature molten salt pump is directly inserted into the pumping pipeline along the guide rail for automatic coupling connection.

In the double-inlet water inlet section 1, a partition d is provided on the symmetrical plane of the two inlets.

When the two helical rectification structures converge to the double helix rectification pipe 4 straight out of the water pipe, a partition 2e is provided at the center of the confluence.

The helical angle of the double helix rectifier tube 4 is 90 degrees to ensure that the positions of the double inlet water inlet section 1 and the double helix rectifier tube 4 do not interfere with each other, and the double inlet section of the double inlet water inlet section 1 and the double outlet pump body 3 The centerlines of the dual outlets are parallel.

Claims (5)

1. A high temperature molten salt pump with double outlet and double volute pump body, including double inlet water inlet section (1), centrifugal impeller (2), double outlet pump body (3), double helical rectifier tube (4) , Bearing body (5), it is characterized in that: The high-temperature molten salt pump with double outlets and double volute pump bodies is a centrifugal submerged pump, and the double inlet section (1) is provided with radially symmetrical double inlets; the double outlet pump body (3) is a double The outlet is quasi-spiral volute, and the double outlet pump body (3) is provided with a centrally symmetrical double outlet (b); the double helical rectifier tube (4) is a three-way structure, and its inlet section is a centrally symmetrical two spiral rectification structure , the two spiral rectification structures converge to the straight water outlet pipe of the double helix rectifier pipe (4), and an automatic coupling connection structure (a) is provided under the flange of the straight water outlet pipe of the double helix rectifier pipe (4); In the high-temperature molten salt pump with double outlets and double volute pump body, the double inlet water inlet section (1) of the pump and the straight outlet pipe of the double helical rectifier tube (4) are all on the lower side of the pump body, and the double inlet water inlet section The inlet of (1) is a free fluid inlet, and the flow direction of the double helix rectifier pipe (4) in the straight outlet pipe is downward; the centrifugal impeller (2) is placed inside the double outlet pump body (3), and the centrifugal impeller (2) ) and the double outlet pump body (3) are provided with guide vanes; the two inlet ends of the double helical rectifier tube (4) are respectively connected with the double outlet ends of the double outlet pump body (3) by bolts, and the double inlet water section ( 1) Placed under the double outlet pump body (3) and connected by bolts; wherein the double inlet section of the double inlet water inlet section (1) is above the straight outlet pipe of the double helical rectifier pipe (4). 2. A high-temperature molten salt pump with double outlets and double volute pump body as claimed in claim 1, characterized in that: the straight outlet pipe of the double helical rectifier tube (4) and the pumping pipeline (6) pass through The automatic coupling mechanism (c) is connected, that is, the high-temperature molten salt pump is directly inserted into the pumping pipeline along the guide rail for automatic coupling connection. 3. A high-temperature molten salt pump with double outlets and double volute pump body as claimed in claim 1, characterized in that: a partition plate is provided at the position of the symmetrical plane of the two inlets in the double inlet water section (1). (d). 4. A high-temperature molten salt pump with double outlet and double volute pump body as claimed in claim 1, characterized in that: when the two helical rectification structures converge to the double helix rectifier tube (4) straight out of the water pipe, the junction The center position is provided with partition two (e). 5. A high-temperature molten salt pump with double outlets and double volute pump body as claimed in claim 1, characterized in that: the helix angle of the double helical rectifier tube (4) is 70-90 degrees, and the double inlets enter water The double inlet section of section (1) is parallel to the center line of the double outlet of the double outlet pump body (3).