Volute type multi-stage high-temperature molten salt submerged pump

Abstract

The utility model relates to a volute type multi-stage high-temperature molten salt submerged pump which comprises a filter screen, a suction section, a first-stage impeller, a pump body, an impeller, a discharge section, a sliding bearing, a pump shaft, a drain pipe assembly, a basic part, a sealing part, a bearing part, a motor support and a coupler part. After being disturbed and filtered by the filter screen, liquid is sucked into the upper side through a suction inlet shaft of the suction section, is pressurized by the first-stage impeller and the plurality of impellers, and finally is spirally lifted through the discharge section and is discharged in the axial direction; the first-stage impeller, the impeller, the sliding bearing, the pump shaft and the bearing part jointly form a rotor part of the pump; the liquid discharge pipe part comprises a liquid discharge pipe and a supporting protection pipe; the center line of an outlet of the discharge section is concentric with a supporting protection pipe of the liquid discharge pipe component, the design centers of the discharge section and the supporting protection pipe coincide with the operation center line of a pump rotor, and the discharge section adopts a double-volute design; the pump is high in operation reliability, the sealing difficulty can be effectively reduced, the operation and maintenance risks are reduced, and the maintenance cost of a unit is lower.

Description

TECHNICAL FIELD

[0001] The utility model relates to a high temperature molten salt liquid pump, concretely relates to a volute type multistage high temperature molten salt liquid pump which is high in pump operation reliability, low in sealing difficulty and low in operation and maintenance risk. BACKGROUND

[0002] The high temperature molten salt liquid pump is a key equipment in a molten salt energy storage system, is specially designed to transport molten salt medium to a higher position or a pressure system under high temperature conditions, is widely applied to the pumping systems of various high temperature molten salts, liquid metals, organic and inorganic compounds, the temperature of the medium can be as high as 500 DEG C or even higher, and the medium usually has certain corrosiveness.

[0003] Because it needs to be operated for a long time under high temperature conditions, strict requirements are put forward to the design, material selection, process and other aspects of the pump. In operation, if the molten salt pump stops or other accidents occur, great economic loss or serious safety accidents will be caused to the whole system operation.

[0004] Most of the existing high temperature molten salt pumps adopt traditional long shaft liquid pumps or traditional liquid suspension pumps.

[0005] The liquid outlet pressure of the existing long shaft liquid pump directly acts on the sealing part, so that the main shaft sealing part and the atmosphere side exist a pressure difference, which leads to sealing difficulty, and there is a risk of leakage of high temperature corrosive molten salt. And most of the existing long shaft liquid pumps adopt space guide vane design and radial guide vane design, which is difficult to cast, poor in wear resistance and corrosion resistance, poor in molten salt discharge performance, and the length of the pump flow part is increased.

[0006] The existing liquid suspension pump, the high temperature molten salt pump basically adopts the traditional axial suction and lateral discharge structure design, because the liquid outlet pipe and the transmission system protection pipe are far away from each other and there is a large mass difference between them, which leads to uneven thermal deformation under high temperature, increases the stress and load of the pump pipeline, and further leads to the deflection of the rotor center and the wear of the bearing parts, and the installation space is large, which is not conducive to the layout design of the site. UTILITY MODEL CONTENTS

[0007] In view of the above problems, the main purpose of the utility model is to provide a volute type multistage high temperature molten salt liquid pump which is high in pump operation reliability, low in sealing difficulty and low in operation and maintenance risk.

[0008] The utility model discloses a volute multi-stage high-temperature molten salt down pump, the volute multi-stage high-temperature molten salt down pump includes: filter screen, suction section, first stage impeller, pump body, impeller, spout section, sliding bearing, pump shaft, liquid discharge pipe assembly, base component, sealing component, bearing component, motor support, shaft coupling component.

[0009] After liquid is filtered by the filter screen, the liquid is sucked into the axial upper side through the suction section inlet, passes through the first stage impeller and the plurality of impellers, is pressurized, and is finally discharged along the axial direction after being spirally raised through the spout section.

[0010] The first stage impeller, the impeller, the sliding bearing, the pump shaft and the bearing component jointly form a rotor component of the pump.

[0011] The liquid discharge pipe component includes a liquid discharge pipe and a support pipe; the outlet center line of the spout section is concentric with the support pipe of the liquid discharge pipe component, and the design centers of the two are coincident with the operating center line of the pump rotor; and the spout section adopts a double volute design.

[0012] The liquid discharge pipe and the support pipe are both fixedly installed on the base component; the motor is installed on the motor support; and the motor shaft and the pump shaft are connected through the shaft coupling component.

[0013] In the embodiment of the utility model, the spout section is detachably fixedly connected with the liquid discharge pipe component through flanges and bolts.

[0014] In the embodiment of the utility model, the liquid discharge pipe and the support pipe in the liquid discharge pipe component are integrally combined.

[0015] In the embodiment of the utility model, the pump body is a pump body adopting a double channel volute.

[0016] In the embodiment of the utility model, the impeller is fixed on the pump shaft through a locking nut; the key on the pump shaft is matched with the impeller, so that the torque of the prime mover is transmitted to the rotor component; and the impeller inlet is axially upwardly sucked.

[0017] In the embodiment of the utility model, the sealing component includes a secondary impeller power labyrinth, a labyrinth power seal, a packing seal and a shaft sleeve.

[0018] The secondary impeller power labyrinth, the labyrinth power seal and the packing seal are sequentially and circumferentially sleeved on the shaft sleeve from bottom to top, and the shaft sleeve is sleeved on the pump shaft.

[0019] In the embodiment of the utility model, the liquid discharge pipe and the support pipe are both fixedly installed on the base component through bolts.

[0020] The volute multi-stage high-temperature molten salt down pump provided by the utility model has the following advantages compared with common technologies:

[0021] 1. The high-efficiency designed double-volute spiral discharge section and drain pipe assembly of the utility model solves the problem of thermal deformation under high temperature, avoids the corrosion of the medium to the main shaft, reduces the risk of failure of the bearing component, reduces the pressure of the main sealing component, greatly improves the design performance of the seal, and improves the reliability of the pump operation.

[0022] 2. The pump body of the utility model adopts a double-channel volute design, is simple to process and cast, has strong resistance to solid particle wear and corrosion, good self-flowing performance of molten salt, and strong anti-crystallization performance. When the system flow fluctuates greatly, the high-efficiency stable operation area is relatively wide, the self-balancing unit radial force makes the unit maintenance cost lower and the reliability higher. Compared with the existing products, the utility model has compact design, safe and reliable operation, small failure risk, low maintenance cost, and better economy.

[0023] 3. The spiral double-volute discharge section makes the pump operation more stable, and the spiral double-volute discharge section design makes the axial and radial thermal expansion of the pump body more uniform, so that the radial force is self-balanced and controllable during pump operation, fundamentally solving the radial instability factor and increasing the reliability of pump operation.

[0024] 4. The utility model adopts a secondary impeller power labyrinth, a labyrinth power seal, and a packing seal to jointly constitute the sealing component of the pump set, which has simple structure, strong practicability, simple maintenance, high reliability, can meet the leak-free sealing of molten salt at low cost design and investment, and improves the economy and safe and reliable operation of the customer. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0026] Figure 2 It is an enlarged view of the sealing component in the utility model.

[0027] The following is the name corresponding to the reference number in the utility model:

[0028] Filter screen 1, suction section 2, primary impeller 3, pump body 4, impeller 5, discharge section 6, sliding bearing 7, pump shaft 8, drain pipe assembly 9, base component 10, sealing component 11, bearing component 12, motor support 13, coupling component 14. DETAILED DESCRIPTION

[0029] The preferred embodiment of the utility model is given below in combination with the drawings to specifically describe the technical scheme of the utility model.

[0030] Figure 1 It is a schematic diagram of the overall structure of the utility model, like Figure 1The utility model provides a volute type multistage high temperature molten salt liquid down pump, the volute type multistage high temperature molten salt liquid down pump includes filter screen 1, suction section 2, first stage impeller 3, pump body 4, impeller 5, spout section 6, sliding bearing 7, pump shaft 8, liquid discharge pipe subassembly 9, base component 10, sealing component 11, bearing component 12, motor support 13, shaft coupling component 14, liquid is filtered after disturbing through filter screen 1, passes through suction section 2 suction inlet axial upside suction through first stage impeller 3, several impellers 5 pressurization, finally through spout section 6 spiral rise and spouts along the axial direction, first stage impeller 3, impeller 5, sliding bearing 7, pump shaft 8, bearing 12 component common composition pump rotor component.

[0031] Liquid discharge pipe component 9 includes liquid discharge pipe 902 and support pipe 901, the outlet center line of spout section 6 is concentric with the support pipe 901 of liquid discharge pipe component 9, and the design center of the two coincides with the pump rotor operation center line, and spout section 6 adopts double volute design.

[0032] Liquid discharge pipe 902 and support pipe 901 are fixedly installed on base component 10, in the specific implementation process, liquid discharge pipe 902 and support pipe 901 are fixedly installed on base component 10 through bolts, the motor is installed on motor support 13, and the motor shaft and the pump shaft are connected through shaft coupling component 14.

[0033] In the specific implementation process, the spout section 6 in the utility model is detachably fixedly connected with the liquid discharge pipe component 9 through flanges and bolts, and the liquid discharge pipe 902 and the support pipe 901 in the liquid discharge pipe component 9 are integrally combined.

[0034] In the specific implementation process, the pump body 4 in the utility model is a pump body adopting double-flow channel volute.

[0035] In the specific implementation process, the impeller in the utility model is fixed on the pump shaft through a lock nut, the key on the pump shaft is matched with the impeller, the prime mover torque is transmitted to the rotor component, and the impeller inlet is axially upward suction.

[0036] The liquid discharge pipe subassembly 9 in the utility model includes the integrated combination design of the liquid discharge pipe and the support pipe, so that the high-temperature and corrosive medium and the pump rotor are separated, the corrosion of the high-temperature and corrosive medium on the pump shaft 8 is effectively reduced, the pressure of the main sealing component 11 is reduced, the design performance of the sealing is greatly improved, and the pump operation reliability is improved.

[0037] Figure 2The utility model discloses a seal component 11, including: vice impeller power labyrinth 1101, labyrinth power seal 1102, disc root seal 1103, shaft sleeve 1104, vice impeller power labyrinth 1101, labyrinth power seal 1102, disc root seal 1103 are in order from bottom to top and encircle the sleeve on shaft sleeve 1104, and the shaft sleeve 1104 is sleeved on the pump shaft 8, and it is different from traditional mechanical dry gas seal, and the simple structure is strong in practicality, can satisfy the leakage -free sealing of molten salt.

[0038] The impeller 4 is fixed on the pump shaft 7 through the lock nut 3, the key on the pump shaft 7 is matched with the impeller 4, the prime mover torque is transmitted to the rotor component 8, and the inlet of the impeller 4 is axially upward suction.

[0039] The utility model discloses a pump body 5 pump body suction inlet is axially upper side suction, and the outlet is spiral rising eccentric rear along the axial discharge, and the outlet center line of pump body 5 is concentric with the liquid discharge pipe component 6, and the design center of both coincides with the operation center line of pump rotor component 8, and pump body 5 adopts double volute design, can guarantee the high efficiency of hydraulic design also balanced the non -uniform characteristics of radial force and pump body high temperature deformation on structure, and pump body 5 is connected with the liquid discharge pipe component 6 through flange and bolt.

[0040] The utility model discloses a pump body 4 adopts double flow channel volute design, can guarantee the high efficiency of hydraulic design also balanced the non -uniform characteristics of radial force and pump body high temperature deformation on structure.

[0041] The utility model discloses a pump body 4 adopts double flow channel volute design, so it has no precision blade structure, and its processing casting is simple, and the solid particle wear and corrosion resistance are strong, and the molten salt is good in self -priming performance, and the crystallization resistance is strong.

[0042] The utility model discloses a pump body 4 volute hydraulic design adopts the design of inclination, guarantees the hydraulic performance under high temperature and corrosion also guarantees the discharge of molten salt in the overhaul stage.

[0043] The utility model discloses a bearing component 12 is by vice impeller power labyrinth 1101, labyrinth power seal 1102, disc root seal 1103, shaft sleeve 1104 together constitute the seal architecture of pump group, and it is different from traditional mechanical dry gas seal, and the simple structure is strong in practicality, can satisfy the leakage -free sealing of molten salt.

[0044] The utility model discloses a pump body 4 volute hydraulic design adopts the design of inclination, guarantees the hydraulic performance under high temperature and corrosion also guarantees the discharge of molten salt in the overhaul stage.

[0045] The highly efficient design of the double volute spiral discharge section and drain pipe assembly solves the problem of thermal deformation under high temperature conditions, avoids corrosion of the main shaft by the medium, reduces the risk of bearing component failure, reduces the pressure of the main sealing component, greatly improves the design performance of the seal, and improves the reliability of pump operation.

[0046] This utility model pump body adopts a dual-channel volute design, which is simple to process and cast, has strong resistance to solid particle wear and corrosion, good molten salt self-flow performance, and strong anti-crystallization performance. When the system flow rate fluctuates greatly, it has a wide efficient and stable operating range. The self-balancing radial force of the unit results in lower maintenance costs and higher reliability. Compared with existing products, it has a compact design, safe and reliable operation, low failure risk, low maintenance costs, and better economic efficiency.

[0047] This invention features a specially designed spiral double volute discharge section, which makes the pump run more smoothly. The spiral double volute discharge section design makes the axial and radial thermal expansion of the pump body more uniform, and makes the radial force autonomously balanced and controllable during pump operation. This fundamentally solves the radial instability factor and increases the reliability of pump operation.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A volute-type multi-stage high-temperature molten salt submersible pump, characterized in that: The volute-type multistage high-temperature molten salt submersible pump includes: a filter screen, a suction section, a first-stage impeller, a pump body, an impeller, a discharge section, a sliding bearing, a pump shaft, a discharge pipe assembly, a foundation component, a sealing component, a bearing component, a motor bracket, and a coupling component. After being filtered by the filter screen, the liquid is drawn in axially upward through the suction port of the suction section, pressurized by the first impeller and several impellers, and finally spiraled upward through the discharge section before being discharged axially. The primary impeller, impeller, sliding bearing, pump shaft, and bearing components together constitute the pump's rotor assembly. The discharge pipe assembly includes a discharge pipe and a support protective pipe; the center line of the outlet of the discharge section is concentric with the support protective pipe of the discharge pipe assembly, and the design center of both coincides with the running center line of the pump rotor. The discharge section adopts a double volute design. The drain pipe and support pipe are fixedly installed on the base components, the motor is installed on the motor bracket, and the motor shaft and pump shaft are connected by a coupling component.

2. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: The discharge section is detachably and fixedly connected to the drain pipe component via flanges and bolts.

3. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: The drain pipe and supporting protective pipe in the drain pipe component are designed as an integrated unit.

4. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: The pump body is a pump body with a double flow channel volute.

5. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: The impeller is fixed to the pump shaft by a lock nut. The key on the pump shaft cooperates with the impeller to transmit the torque of the prime mover to the rotor assembly. The impeller inlet is axially upward suction.

6. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: The sealing components include: auxiliary impeller dynamic labyrinth, labyrinth dynamic seal, packing seal, and shaft sleeve; The auxiliary impeller power labyrinth, labyrinth power seal, and packing seal are sequentially wrapped around the shaft sleeve from bottom to top, and the shaft sleeve is fitted onto the pump shaft.

7. The volute-type multi-stage high-temperature molten salt submersible pump according to claim 1, characterized in that: Both the drain pipe and the support pipe are fixedly installed on the base components with bolts.

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