Low-liquid-level self-balancing high-temperature submerged pump

Abstract

The invention relates to a low-liquid-level self-balancing high-temperature submerged pump which is characterized in that a pump body suction inlet of a pump body of the low-liquid-level self-balancing high-temperature submerged pump is used for axial upper-side suction, a discharge outlet of the pump body of the low-liquid-level self-balancing high-temperature submerged pump is spirally ascended and eccentrically and then is axially discharged, and the low-liquid-level self-balancing high-temperature submerged pump adopts a spiral double-volute pump body. Back blades are arranged on a rear cover plate of the impeller and synchronously rotate along with the impeller, and an emptying valve is arranged at the bottom of the pump body. By applying the double-volute spiral pump body and the liquid discharge pipe assembly, the problem of thermal deformation of an existing product in a high-temperature state is effectively avoided, the pump body forms a liquid accumulation tank body mode in a self-heating mode due to the inverted impeller design and the spiral double-volute pump body design, the starting liquid level of the pump is effectively reduced, the suction performance of the pump is improved, and the service life of the pump is prolonged. And the emptying valve is designed at the bottom of the pump body, so that medium splashing is avoided under the condition that it is ensured that the medium in the pump is completely emptied, and the safety risk is effectively reduced.

Description

Technical Field

[0001] The invention relates to a high-temperature submersible pump, and in particular to a low-liquid-level self-balancing high-temperature submersible pump which effectively avoids the problem of thermal deformation of existing products under high-temperature conditions, improves pump suction performance, and operates safely and reliably. Background Art

[0002] High temperature submersible pumps are specially used to transport various media under high temperature conditions. They are widely used in pumping systems of various high temperature molten salts, liquid metals, organic and inorganic compounds. The temperature of such media can reach up to 500℃ or even higher, and the media are usually corrosive.

[0003] As one of the most critical equipment in the high-temperature medium transportation system, the high-temperature submersible pump needs to operate for a long time under high-temperature conditions, which places strict requirements on the design, material selection, process, etc. of the pump. In actual operation, if a problem occurs in the high-temperature submersible pump and causes a shutdown accident, it will cause great economic losses or serious safety accidents to the operation of the entire system.

[0004] Most of the existing high-temperature submersible pumps adopt an axial downward suction and lateral discharge submersible suspended pump design. Since this type of pump adopts a single volute design, the pump cannot effectively balance the radial force. In addition, the existing design separates the discharge pipe and the protective pipe, which causes serious thermal deformation of the pump under high temperature conditions, which in turn leads to other safety operation risks.

[0005] The existing high-temperature submersible pump has axial force due to the different areas of the front and rear cover plates of the impeller. Although there are many ways to balance the axial force, these measures are achieved by increasing production and processing costs or reducing pump performance.

[0006] Existing high-temperature submersible pumps all adopt the method of axially downward suction and radial discharge of the impeller, which significantly increases the liquid level when the pump is started and has the potential safety hazard of insufficient suction and vacuum during operation.

[0007] Existing high-temperature submersible pumps all use gravity emptying to discharge the internal medium. Although this solution is simple and can effectively achieve the emptying of the medium, it may cause safety hazards such as splashing during the pump disassembly process. Summary of the invention

[0008] In view of the above problems, the main purpose of the present invention is to provide a low-liquid-level self-balancing high-temperature submersible pump which effectively avoids the thermal deformation problem of existing products under high-temperature conditions, improves the pump suction performance, and operates safely and reliably.

[0009] The present invention solves the above technical problems through the following scheme: a low liquid level self-balancing high temperature submersible pump, wherein the pump body suction port of the low liquid level self-balancing high temperature submersible pump pump body is axially upper side suction, and the discharge port is spirally ascending eccentrically and then axially discharged. The low liquid level self-balancing high temperature submersible pump adopts a spiral double volute pump body, the center line of the pump body outlet is concentric with the discharge pipe component, and the design centers of the two coincide with the operating center line of the pump rotor component.

[0010] The impeller in the low liquid level self-balancing high temperature submerged pump is inverted, and the impeller comprises a front cover plate and a rear cover plate. The rear cover plate of the impeller is provided with a back blade, and the back blade rotates synchronously with the impeller. A drain valve is provided at the bottom of the pump body.

[0011] In a specific implementation example of the present invention, the impeller is fixed to the pump shaft by a locking nut, the key on the pump shaft cooperates with the impeller to transmit the prime mover torque to the rotor component, and the impeller inlet is axially upwardly sucked.

[0012] In a specific implementation example of the present invention, the discharge pipe component includes a supporting protective pipe and a discharge pipe, which together provide safe support for the operation of the pump.

[0013] In a specific implementation example of the present invention, the drain valve includes a valve core, a gasket, a spring, a valve seat and a valve cover; the gasket is installed on the valve core, the spring is installed on the valve seat, the valve core and the valve seat are connected by threads, and the valve cover and the pump cover are connected by threads; the gasket and the pump cover are installed in coordination.

[0014] In a specific implementation example of the present invention, the pump body is connected to the discharge pipe component through a flange and bolts.

[0015] The positive and progressive effect of the present invention is that compared with common similar technologies, the low-liquid-level self-balancing high-temperature submerged pump provided by the present invention effectively avoids the problem of thermal deformation of existing products under high temperature conditions due to the application of the double-volute spiral pump body and the discharge pipe assembly of the present invention. The inverted impeller design and the spiral double-volute pump body design allow the pump body to self-heat and form a liquid accumulation tank mode, effectively reducing the pump starting liquid level, improving the pump suction performance, and reducing the risk of vacuum. The drain valve is designed at the bottom of the pump body to avoid medium splashing while ensuring that the medium inside the pump is completely emptied, effectively reducing safety risks. Compared with existing products, it has a compact design, safe and reliable operation, low failure risk, low maintenance cost, and better economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the low liquid level self-balancing high temperature submersible pump proposed by the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of the drain valve in the present invention.

[0018] Figure 3 It is the front view of the impeller in the present invention.

[0019] Figure 4 It is a cross-sectional view of the impeller in the present invention. DETAILED DESCRIPTION

[0020] Preferred embodiments of the present invention are given below in conjunction with the accompanying drawings to illustrate the technical solutions of the present invention in detail.

[0021] Figure 1 This is a schematic diagram of the overall structure of the low liquid level self-balancing high temperature submersible pump proposed by the present invention. Figure 2 Schematic diagram of the structure of the drain valve in the present invention, as shown in Figure 1-2 As shown: a low liquid level self-balancing high temperature submersible pump proposed by the present invention, the pump body suction port of the low liquid level self-balancing high temperature submersible pump pump body 5 is axially upper side suction, and the discharge port is spirally ascending eccentrically and then axially discharged. The low liquid level self-balancing high temperature submersible pump adopts a spiral double volute pump body.

[0022] Figure 3 is a front view of the impeller in the present invention, Figure 4 FIG. 2 is a cross-sectional view of the impeller of the present invention. Figure 3-4 As shown: the impeller 4 in the low liquid level self-balancing high temperature submersible pump proposed by the present invention is invertedly arranged, the impeller 4 includes a front cover plate 401 and a rear cover plate 402, a back blade 403 is arranged on the rear cover plate 402 of the impeller 4, the back blade 403 rotates synchronously with the impeller, and a drain valve 2 is arranged at the bottom of the pump body 5.

[0023] The impeller 4 is fixed to the pump shaft 7 by a locking nut 3. The key on the pump shaft 7 cooperates with the impeller 4 to transmit the torque of the prime mover to the rotor component 8. The inlet of the impeller 4 is axially upwardly sucked.

[0024] The discharge pipe component 6 includes a supporting protective tube 601 and a discharge pipe 602, which together provide safe support for the operation of the pump.

[0025] The drain valve 2 in the present invention comprises a valve core 201, a gasket 202, a spring 203, a valve seat 204 and a valve cover 205. The gasket 202 is mounted on the valve core 201, the spring 203 is mounted on the valve seat 204, the valve core 201 and the valve seat 204 are connected by threads, and the valve cover 205 and the pump cover 1 are connected by threads to prevent the valve group from falling off; the gasket 202 is installed in conjunction with the pump cover 1 to prevent liquid leakage during operation.

[0026] The present invention comprises a pump cover 1, an exhaust valve 2, a locking nut 3, an impeller 4, a pump body 5, a discharge pipe component 6, a pump shaft 7, a rotor component 8, a liquid throwing wheel 9, a base component 10, a sealing component 11, a bearing component 12, and a motor bracket 13.

[0027] The locking nut 3, the impeller 4, the pump shaft 7, the liquid-spinning wheel, the bearing and the like of the present invention together constitute the rotor component 8 of the pump.

[0028] The pump body 5 of the present invention has an axial upper suction port and an axial discharge port that spirally rises eccentrically and then discharges axially. The outlet centerline of the pump body 5 is concentric with the discharge pipe component 6, and the design centers of the two coincide with the operating centerline of the pump rotor component 8. The pump body 5 adopts a double volute design, which can not only ensure the high efficiency of the hydraulic design but also structurally balance the radial force and the uneven characteristics of high-temperature deformation of the pump body. The pump body 5 is connected to the discharge pipe component 6 by flanges and bolts.

[0029] In the present invention, the impeller 4 is fixed to the pump shaft 7 by the locking nut 3. The key on the pump shaft 7 cooperates with the impeller 4 to transmit the torque of the prime mover to the rotor component 8. The inlet of the impeller 4 is axially upwardly sucked.

[0030] The inverted design of the impeller 4 and the spiral double volute pump body 5 of the present invention enable the pump body 5 to self-heat and form a liquid accumulation tank mode, effectively reducing the starting liquid level of the submerged pump, improving the pump suction performance, and reducing the risk of vacuum.

[0031] In the present invention, the discharge pipe component 6 is composed of a support tube 601 and a discharge pipe 602 to provide safe support for the operation of the pump.

[0032] The drain valve 2 of the present invention avoids splashing of the medium while ensuring that the medium inside the pump is completely drained, thereby effectively reducing safety risks.

[0033] Most of the existing high-temperature submersible pumps adopt an axial downward suction and lateral discharge submersible suspended pump design. Since this type of pump adopts a single volute design, the pump cannot effectively balance the radial force. In addition, the existing design separates the discharge pipe and the protective pipe, which causes serious thermal deformation of the pump under high temperature conditions, which in turn leads to other safety operation risks.

[0034] The solution of the present invention is to effectively advance the distance between the discharge pipe and the center of the pump rotor through a specially designed spiral double-volute pump body, so that the overall center of gravity of the pump coincides with the center line of the pump rotor, and the operation of the pump is more stable. The spiral double-volute pump body design makes the axial and radial thermal expansion of the pump body more uniform, and also makes the radial force autonomously balanced and controllable when the pump is running, fundamentally solving the radial instability factor and increasing the reliability of the pump operation.

[0035] The existing high-temperature submersible pump has axial force due to the different areas of the front and rear cover plates of the impeller. Although there are many ways to balance the axial force, these measures are achieved by increasing production and processing costs or reducing pump performance.

[0036] The solution of the present invention is to invert the impeller design to inhale from the upper side. Compared with the existing axial downward suction design, the axial force generated by the impeller can be effectively balanced with the gravity of the rotor itself, thereby reducing the load on the upper bearing and reducing the risk of bearing failure. In addition, a back blade is designed on the rear cover plate of the impeller, and the back blade rotates synchronously with the impeller, effectively preventing leakage and improving the operating efficiency of the pump.

[0037] Existing large high-temperature submersible pumps all adopt the method of axially downward suction and radial discharge of the impeller, which significantly increases the liquid level when the pump is started and has the potential safety hazard of insufficient suction and vacuum during operation.

[0038] The solution of the present invention is to inhale from the upper side by inverting the impeller design. Compared with the existing axial downward suction design, the impeller design of the present invention is in a backflow state. In addition, the spiral double volute pump body of the present invention adopts axial upward discharge compared with the lateral discharge of the existing solution, so that the pump body self-heats to form a liquid accumulation tank mode, effectively reducing the pump starting liquid level, improving the pump suction performance, and reducing the risk of vacuum.

[0039] Existing high-temperature submersible pumps all use gravity emptying to discharge the internal medium. Although this solution is simple and can effectively achieve the emptying of the medium, it may cause safety hazards such as splashing during the pump disassembly process.

[0040] The solution of the present invention is to design a drain valve at the bottom of the pump body. The drain valve is a specially designed check valve. The check valve is closed when the pump is running. When the medium needs to be drained during maintenance, the medium can be discharged in an orderly and targeted manner through external tools. While ensuring that the medium inside the pump is completely drained, medium splashing is avoided, effectively reducing safety risks.

[0041] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected, and the scope of the present invention to be protected is defined by the attached claims and their equivalents.

Claims

1. A low liquid level self-balancing high temperature submersible pump, characterized in that: The pump body suction port of the low-liquid-level self-balancing high-temperature submersible pump is axially sucked from the upper side, and the discharge port is spirally ascending eccentrically and then discharged along the axial direction. The low-liquid-level self-balancing high-temperature submersible pump adopts a spiral double-volute pump body, and the center line of the pump body outlet is concentric with the discharge pipe component, and the design centers of the two coincide with the running center line of the pump rotor component; The impeller in the low liquid level self-balancing high temperature submerged pump is inverted, and the impeller comprises a front cover plate and a rear cover plate. The rear cover plate of the impeller is provided with a back blade, and the back blade rotates synchronously with the impeller. A drain valve is provided at the bottom of the pump body.

2. The low liquid level self-balancing high temperature submersible pump according to claim 1 is characterized in that: The impeller is fixed to the pump shaft by a locking nut. The key on the pump shaft cooperates with the impeller to transmit the torque of the prime mover to the rotor component. The impeller inlet is axially upward suction.

3. The low liquid level self-balancing high temperature submersible pump according to claim 1 is characterized in that: The discharge pipe components include a supporting protective pipe and a discharge pipe, which together provide safe support for the operation of the pump.

4. The low liquid level self-balancing high temperature submersible pump according to claim 1 is characterized in that: The drain valve includes a valve core, a gasket, a spring, a valve seat and a valve cover; the gasket is installed on the valve core, the spring is installed on the valve seat, the valve core and the valve seat are connected by threads, and the valve cover and the pump cover are connected by threads; the gasket and the pump cover are installed in coordination.

5. The low liquid level self-balancing high temperature submersible pump according to claim 1 is characterized in that: The pump body is connected to the discharge pipe component through flanges and bolts.

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