CN210919466U - Cooling device used in vertical multistage centrifugal pump during high-temperature fluid conveying - Google Patents

Abstract

The utility model discloses a cooling device that vertical multistage centrifugal pump used when carrying high temperature fluid, mainly include pump chamber etc, the pump chamber top sets up the air-cooling chamber, air-cooling chamber top sets up the mechanical seal chamber, it separates to be equipped with the heating panel between mechanical seal chamber and the air-cooling chamber, mechanical seal chamber top sets up the motor, the axle of motor penetrates the mechanical seal intracavity and runs through the air-cooling chamber and reachs the pump chamber through mechanical seal, the axle is located air-cooling chamber section outside suit cooling tube subassembly, both ends get into mechanical seal chamber and pump chamber respectively about the cooling tube subassembly. The middle pump cavity and the sealing cavity of the utility model are separated, so that the heat of the high-temperature medium in the pump cavity can not be transferred to the sealing cavity, the sealing element is at a safe working temperature, and the operation reliability of the pump is improved; the oily medium cannot be carbonized, so that the end face of a friction pair of the mechanical seal is effectively protected; the cooling pipe structure does not need external water to supplement the sealing cavity, and can directly use the liquid of the pump cavity to prevent the machine seal from being worn dry to cause failure.

Description

Cooling device used in vertical multistage centrifugal pump during high-temperature fluid conveying

Technical Field

The utility model relates to a high temperature, light-duty vertical multistage centrifugal pump's field, concretely relates to vertical multistage centrifugal pump is cooling device who uses when carrying high temperature fluid.

Background

The air cooling cavity is a cavity body which takes away heat by utilizing air flow so as to reduce the temperature; the sealing cavity is an environment cavity for mechanical sealing work; the heat dissipation plate is a stainless steel plate with a plurality of heat dissipation fins.

The high-temperature centrifugal pump is a widely used device for conveying high-temperature media in various industrial production at present, and the existing high-temperature centrifugal pump has some defects in production due to the defects of the structural design: the sealing cavity is adjacent to the pump cavity, the heat of a high-temperature medium in the pump cavity is easily transferred to the sealing cavity, so that the sealing cavity is in a high-temperature state, the rubber piece of the mechanical seal can generate thermal expansion under a high-temperature environment, the thermal expansion coefficients of different materials are different, a leakage gap can be generated, the seal can lose efficacy, and the water pump leaks water; when an oily medium is conveyed, oil is carbonized at a high temperature, carbon particles can be formed after carbonization, and the carbon particles are attached to the end face of a friction pair of a mechanical seal, so that the friction pair can be scratched and abraded, the mechanical seal fails, and water leakage of a water pump is caused; the existing high-temperature centrifugal pump is not provided with an automatic exhaust device, gas is generated in the operation process of a water pump, the pressure at a mechanical seal part can be increased, dry grinding of the mechanical seal can be caused, and a rubber part and a friction pair can lose efficacy, so that liquid leakage of the water pump is caused; the structure of an air cooling cavity and a cooling pipe is omitted, so that high temperature in a pump cavity can be directly transmitted to the motor or transmitted to the motor along a pump shaft, the temperature of a motor bearing is too high, lubricating grease of the motor bearing fails, the bearing is damaged, and the motor is damaged; under the background, the structure of the high-temperature vertical multistage centrifugal pump needs to be redesigned, so that the structural defect of the existing high-temperature centrifugal pump product is overcome, and the pump runs more reliably and stably.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of prior art existence, and provide a cooling device that vertical multistage centrifugal pump used when carrying high temperature fluid, have safe and reliable, the range of application is extensive, long service life's advantage.

The purpose of the utility model is accomplished through following technical scheme: the cooling device used when the vertical multistage centrifugal pump is used for conveying high-temperature fluid mainly comprises a motor, an automatic exhaust valve, a shaft, a mechanical seal cavity, a heat dissipation plate, an air cooling cavity, a cooling pipe assembly and a pump cavity, wherein the air cooling cavity is arranged above the pump cavity; the cooling pipe assembly comprises a fixed sleeve, a cooling pipe sleeve and a cooling pipe, the bottom of the cooling pipe assembly is fixedly connected with the pump cavity through threads, the fixed sleeve is in interference fit with the cooling pipe sleeve to fix the cooling pipe, the cooling pipe is directly sleeved on the shaft, a certain gap is reserved between the cooling pipe and the shaft, and one side of the mechanical seal cavity is communicated with the automatic exhaust valve.

Furthermore, a plurality of radiating fins are locally distributed on the radiating plate.

Preferably, the cooling pipe is made of graphite tetrafluoroethylene material.

The utility model has the advantages that:

1. the pump cavity is separated from the sealing cavity, so that the heat of a high-temperature medium in the pump cavity is not transferred to the sealing cavity, the sealing element is at a safe working temperature, the sealing effect is effectively ensured, the service life of the sealing element is prolonged, and the operation reliability of the pump is improved;

2. when the oily medium is conveyed, the sealing cavity is at the safe temperature of the mechanical seal, and the oily medium cannot be carbonized, so that the end face of a friction pair of the mechanical seal is effectively protected, the operation of the pump is more reliable and stable, and the application range of the pump and the market competitiveness of a product are increased;

3. the cooling cavity is arranged to take away part of heat transferred up and down in the pump cavity by means of air flow, so that the temperature of the sealing cavity is maintained at the working condition of safe working of the sealing element; the cooling pipe can reduce the temperature of liquid flowing to a low-pressure area in the pump cavity, so that the temperature of the liquid in the sealed cavity is at a safe working temperature, heat in the pump cavity can be effectively reduced and transmitted to the motor end through the pump shaft, the phenomenon that lubricating grease of a motor bearing fails due to overhigh temperature is prevented, the motor damage caused by the damage of the bearing is avoided, and the service life of the motor is prolonged;

4. the cooling tube assembly structure does not need external water to supplement the sealing cavity, can directly use the liquid of the pump cavity to supplement the sealing cavity after the cooling tube is cooled, effectively protects mechanical sealing, and prevents machine sealing from being worn and causing failure.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of a cooling tube assembly.

Description of reference numerals: the automatic air cooling device comprises a motor 1, an automatic exhaust valve 2, a shaft 3, a mechanical seal 4, a mechanical seal cavity 5, a heat dissipation plate 6, an air cooling cavity 7, a cooling pipe assembly 8, a fixing sleeve 8-1, an O-shaped rubber seal ring A8-2, a cooling pipe sleeve 8-3, a cooling pipe 8-4, an O-shaped rubber seal ring B8-5 and a pump cavity 9.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

example (b): as shown in the attached drawings, the cooling device used when the vertical multistage centrifugal pump is used for conveying high-temperature fluid mainly comprises a motor 1, an automatic exhaust valve 2, a shaft 3, a mechanical seal 4, a mechanical seal cavity 5, a heat dissipation plate 6, an air cooling cavity 7, a cooling pipe assembly 8 and a pump cavity 9, wherein the air cooling cavity 7 is arranged above the pump cavity 9, the mechanical seal cavity 5 is arranged above the air cooling cavity 7, the heat dissipation plate 6 is arranged between the mechanical seal cavity 5 and the air cooling cavity 7 for separation, the motor 1 is arranged above the mechanical seal cavity 5, the shaft 3 of the motor 1 penetrates into the mechanical seal cavity 5 through the mechanical seal 4 in a sealing manner and penetrates through the air cooling cavity 7 to reach the pump cavity 9, the cooling pipe assembly 8 is sleeved outside the section of the air cooling cavity 7, and the upper end and the lower end of the cooling pipe assembly 8; the cooling pipe assembly 8 consists of a fixed sleeve 8-1, a cooling pipe sleeve 8-3 and a cooling pipe 8-4, the bottom of the cooling pipe assembly 8 is fixedly connected with a pump cavity 9 through M threads, the cooling pipe 8-4 is fixed by the interference fit of the fixed sleeve 8-1 and the cooling pipe sleeve 8-3, the cooling pipe 8-4 is directly sleeved on the shaft 3 (a small gap is reserved between the cooling pipe 8-4 and the shaft 3, so that fluid in the pump cavity 9 slowly flows to the mechanical seal cavity 5 through the gap under the pressure difference), the O-shaped rubber seal ring A8-2 is sleeved outside the cooling pipe sleeve 8-3 to play a role in sealing with the mechanical seal cavity 5, the cooling pipe sleeve 8-3 is made of stainless steel metal materials and is a structural part, and the heat of the cooling pipe 8-4 is continuously dissipated into the air through the cooling pipe sleeve 8-3; one side of the mechanical seal cavity 5 is communicated with the automatic exhaust valve 2.

Preferably, the heat dissipation plate 6 has a plurality of fins distributed locally.

Preferably, the cooling pipes 8-4 are made of graphite tetrafluoroethylene materials, have good high-temperature resistance and low expansion coefficient, and are subjected to finish machining on the inner diameter of the pipes.

The utility model discloses design and theory of operation: the motor 1 and the mechanical seal 4 are not suitable for being used in a high-temperature environment, the thermal conductivity of air is much lower than that of metal, the air cooling cavity 7 is designed by utilizing the low thermal conductivity of air, the volume of the air cooling cavity 7 and the size of an air convection hole of the air cooling cavity can directly influence the temperature of a medium in the mechanical seal cavity 5, and the heat in the pump cavity 9 is effectively prevented from being transferred to the mechanical seal cavity 5 by utilizing the low thermal conductivity of air; because the shaft 3 is directly connected with the mechanical seal 4 and the motor 1, heat is easily transferred to the mechanical seal cavity 5 and the motor 1 through the shaft 3, the mechanical seal 4 and the motor 1 can be damaged in a high-temperature environment, a cooling pipe assembly 8 is designed, the friction pair end surface of the mechanical seal 4 can generate heat due to friction and part of liquid can be gasified in the high-speed running process of the water pump, an automatic exhaust valve 2 is additionally arranged in the mechanical seal cavity 5, gas generated by the automatic exhaust valve 2 can be exhausted timely, the mechanical seal 4 is ensured not to be subjected to dry grinding, the mechanical seal cavity 5 can be in a low-pressure state due to the exhaust of the gas in the mechanical seal cavity 5, the cooling pipe assembly 8 is made of special graphite tetrafluoroethylene material and stainless steel material, the high-temperature resistant effect is good, a small gap is reserved between the cooling pipe 8-4 and the shaft 3, and due to the low-pressure state at the mechanical seal 4, make the liquid in the pump chamber 9 can flow to mechanical seal chamber 5 through the clearance, less clearance has played the effect of medium cooling simultaneously, make the liquid that flows to mechanical seal chamber 5 be in the low temperature state, play the cooling effect in mechanical seal chamber 5, and replenished the liquid that is gasified in the mechanical seal chamber 5, guarantee that mechanical seal can not take place the condition of dry grinding, when pump chamber 9 and mechanical seal chamber 5's both sides pressure is in balanced, less clearance also can prevent the convection current between the high temperature liquid of pump chamber 9 and the low temperature liquid of mechanical seal chamber 5, guarantee that mechanical seal chamber 5 liquid is in the low temperature state. The mechanical seal cavity 5 is designed with a heat dissipation plate 6, a plurality of heat dissipation fins are locally distributed on the heat dissipation plate 6, and under the convection of air in the air cooling cavity 7, a part of heat in the mechanical seal cavity 5 is taken away, so that the temperature in the mechanical seal cavity 5 is reduced as far as possible.

It should be understood that equivalent substitutions or changes to the technical solution and the inventive concept of the present invention should be considered to fall within the scope of the appended claims for the skilled person.

Claims (3)

1. A cooling device used by a vertical multistage centrifugal pump during high-temperature fluid conveying is characterized in that: mainly comprises a motor (1), an automatic exhaust valve (2), a shaft (3), a mechanical seal (4), a mechanical seal cavity (5), a heat dissipation plate (6), an air cooling cavity (7), a cooling pipe assembly (8) and a pump cavity (9), an air cooling cavity (7) is arranged above the pump cavity (9), a mechanical sealing cavity (5) is arranged above the air cooling cavity (7), a heat dissipation plate (6) is arranged between the mechanical sealing cavity (5) and the air cooling cavity (7) for separation, a motor (1) is arranged above the mechanical sealing cavity (5), a shaft (3) of the motor (1) penetrates into the mechanical sealing cavity (5) through a mechanical seal (4) in a sealing mode and penetrates through the air cooling cavity (7) to reach the pump cavity (9), a cooling pipe assembly (8) is sleeved on the outer side of the section, located on the air cooling cavity (7), of the shaft (3), and the upper end and the lower end of the cooling pipe assembly (8) respectively enter the mechanical sealing cavity (5) and the pump cavity (; the cooling pipe assembly (8) consists of a fixed sleeve (8-1), a cooling pipe sleeve (8-3) and a cooling pipe (8-4), the bottom of the cooling pipe assembly (8) is fixedly connected with the pump cavity (9), the fixed sleeve (8-1) is in interference fit with the cooling pipe sleeve (8-3) so as to fix the cooling pipe (8-4), the cooling pipe (8-4) is directly sleeved on the shaft (3), and a certain gap is reserved between the cooling pipe (8-4) and the shaft (3); one side of the mechanical seal cavity (5) is communicated with the automatic exhaust valve (2).

2. The cooling apparatus for use in a vertical multistage centrifugal pump for transporting a high-temperature fluid according to claim 1, wherein: the radiating plate (6) is locally distributed with a plurality of radiating fins.

3. The cooling apparatus for use in a vertical multistage centrifugal pump for transporting a high-temperature fluid according to claim 1, wherein: the cooling pipe (8-4) is made of graphite tetrafluoroethylene material.

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