CN103291640B - Shurry pump under a kind of vertical nitrogen sealing gland cooling magnetic liquid - Google Patents

Abstract

A vertical nitrogen gas seal cooling magnetic force submerged slurry pump, including a pump body, a bearing seat, and a pump cover. A pump shaft is arranged in the bearing seat through a bearing, and a nitrogen interface is connected to the bearing seat through a small hole. There is an upper connecting pipe on the seat, a motor is arranged on the upper connecting pipe, and the flange of the upper connecting pipe is arranged on the mounting plate; a lower connecting pipe is arranged under the bearing seat, and a pump body is arranged under the lower connecting pipe, and the side of the pump body is connected by a flange. liquid pipe; the pump body below the pump shaft is provided with an impeller and an impeller nut for fixing the impeller; an inner magnetic rotor assembly is arranged in the upper connection pipe above the pump shaft, and an isolation sleeve is arranged on the outer ring of the inner magnetic rotor assembly, and an isolation sleeve is arranged above the isolation sleeve. The outer magnetic rotor assembly is connected to the shaft of the motor. The invention has the advantages of compact structure, long service life, large transmission torque, high transmission efficiency, stable and reliable operation, convenient installation and maintenance, low maintenance cost and capable operation.

Description

A vertical nitrogen air seal cooling magnetic force submerged slurry pump

Technical field:

The invention relates to a submerged slurry pump, in particular to a vertical nitrogen gas seal cooling magnetic submerged slurry pump.

Background technique:

The submerged slurry pumps used by all domestic chemical companies adopt a structure consisting of a set of rolling bearings and a bearing seat assembly with the shaft installed in the bearing seat, an intermediate connecting pipe, a pump cover, an impeller, a pump body and a liquid outlet pipe. The lower end of the submerged slurry pump does not have a sliding bearing, but the length of the shaft extension cantilever is long, which is prone to vibration and noise during operation, and the submerged depth can only be less than 1.5 meters, which can only transport general slurry media. If the working condition that needs to be sealed must be equipped with a mechanical seal. The mechanical seal is a vulnerable part and needs to be replaced frequently. It is difficult to install and maintain, and the maintenance cost is high.

Most of the existing magnetic pumps adopt the structure of horizontal and sliding bearings, which require medium for cooling and lubrication. When the pump is started, it needs to be in contact with liquid, especially for toxic, harmful, polluted and volatile media, which will have great difficulty in contacting liquid; the existing All magnetic pumps can only transport clean media that do not contain solid particles and gas, and must not run dry without liquid; the existing magnetic pumps all have the magnetic field cutting the magnetic force lines when the inner magnetic rotor and the outer magnetic rotor are running. The defect that the eddy current heat cannot be dissipated, which leads to the demagnetization failure of the magnetic steel due to the high eddy current heat, the vaporization of the lubricating medium due to the high eddy current heat leads to poor lubrication, easy wear of the sliding bearing and thrust bearing, and high failure rate of the pump.

Invention content:

The purpose of the present invention is to provide a vertical nitrogen gas seal cooling magnetic force liquid slurry pump, the present invention has compact structure, long service life, large transmission torque, high transmission efficiency, stable and reliable operation, convenient installation and maintenance, and low maintenance cost , and capable of running.

The present invention is achieved in this way, a vertical nitrogen air seal cooling magnetic force liquid slurry pump, including a pump body, a bearing seat, and a pump cover, characterized in that: the bearing seat is provided with a pump shaft through a bearing, and the bearing The seat is connected with a nitrogen port through a small hole, and the bearing seat is provided with an upper connecting pipe, and the motor is arranged on the upper connecting pipe, and the flange of the upper connecting pipe is arranged on the mounting plate; the lower connecting pipe is arranged under the bearing seat, and the pump is arranged under the lower connecting pipe. The side of the pump body is connected with a liquid outlet pipe through a flange; the impeller and the impeller nut for fixing the impeller are arranged in the pump body below the pump shaft; The ring is provided with an isolation sleeve, and an outer magnetic rotor assembly is arranged above the isolation sleeve, and the outer magnetic rotor assembly is connected to the shaft of the motor.

The invention has the advantages of compact structure, long service life, large transmission torque, high transmission efficiency, stable and reliable operation, convenient installation and maintenance, low maintenance cost and capable operation.

Description of drawings:

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

In the figure 1. Pump body, 2. Impeller, 3. Pump cover, 4. Outlet pipe, 5. Lower nozzle, 6. Bearing seat, 7. Pump shaft, 8. Inner magnetic rotor assembly, 9. Cover, 10 . Outer magnetic rotor assembly, 11. Isolation sleeve, 12. Motor, 13. Upper connection tube, 14. Mounting plate, 15. Nut, 16. Upper bearing gland, 17. Bearing, 18. Nitrogen port, 19. Lower bearing pressure Cover, 20, impeller nut.

detailed description:

Below in conjunction with accompanying drawing, the present invention will be further described:

Referring to the accompanying drawings, a vertical nitrogen gas seal cooling magnetic force liquid slurry pump includes a pump body 1, a bearing seat 6, and a pump cover 3. It is characterized in that: the bearing seat 6 is provided with a pump shaft through a bearing 17 7. The nitrogen interface 18 is connected to the bearing seat 6 through a small hole, the upper connecting pipe 13 is arranged on the bearing seat 6, the motor 12 is arranged on the upper connecting pipe 13, and the flange of the upper connecting pipe 13 is arranged on the mounting plate 14; the bearing seat 6 A lower connecting pipe 5 is provided below, and a pump body 1 is arranged below the lower connecting pipe 5, and the side of the pump body 1 is connected with a liquid outlet pipe 4 through a flange; the pump body 1 below the pump shaft 7 is provided with an impeller 2 and a fixed impeller 2 The impeller nut 20; the upper connecting pipe 13 above the pump shaft 7 is provided with an inner magnetic rotor assembly 8, the outer ring of the inner magnetic rotor assembly 8 is provided with a spacer 11, and the upper part of the spacer 11 is provided with an outer magnetic rotor assembly 10, the outer magnetic rotor assembly 10 is connected on the shaft of motor 12. During specific implementation, the present invention adopts the special dense type, magnetic accumulation type, magnetic contactless transmission device coupled with push-pull magnetic circuit designed by special magnetic circuit design method, the magnetic transmission efficiency is 5-10% higher than similar magnetic drive, so it has It has the advantages of compact structure, small volume, large torque, small eddy current, and high magnetic transmission efficiency; it uses nitrogen to cool and lubricate the rolling bearing, and achieves the function of gas sealing to prevent the leakage of medium steam and prevent the transmission medium from contacting the bearing. The transmission medium can be slurry and Medium containing more impurities. At the same time, we use our company's invention patent number: ZL200910231778.2 to make a special non-metallic material isolation sleeve. The resistivity of the non-metallic isolation sleeve is infinite, and no eddy current heat is generated during operation, and there is no need to use coolant to cool the inner magnet. The rotor takes away the eddy current heat, so the temperature of the inner and outer magnetic rotors will not rise to cause demagnetization, ensuring that the magnetic non-contact transmission device has high transmission efficiency and operation stability, so that the magnetic non-contact transmission device can run efficiently. The static sealing gasket is used to seal to ensure that there is no leakage, so that the pump can run dry for up to 3 years. The pump adopts non-grease lubricated rolling bearings to replace the sliding bearings in contact with the medium in ordinary magnetic pumps. Rolling bearings can withstand the radial force generated during pump operation and the balanced residual axial force, making the pump more stable and reliable; sliding bearings can only withstand the radial force generated during pump operation, and thrust bearings can only withstand very small bearing force. The extended bearing seat is used to increase the axial distance between the two bearings and shorten the cantilever length of the shaft extension. There is no sliding bearing on the rotating part, which can effectively improve the stability and reliability of the pump operation. The bearings are cooled by nitrogen air seals, which can cool and lubricate the bearings and the inner and outer magnetic rotors, effectively prevent the medium steam from leaking out, prevent the conveying medium from contacting the bearings, realize dry operation, and prolong the cycle life of the pump. Back vanes are set on the back of the main impeller to reduce the back pressure of the impeller during pump operation; at the same time, the inlet pressure of the injected dry gas is 0.2MPa higher than the material pressure, which can prevent the steam of the conveying medium from leaking out and contacting the bearing, so as to achieve full protection The role of bearings. The motor of the present invention drives the inner magnetic rotor to rotate through the outer magnetic rotor assembly, drives the impeller to rotate through the pump shaft, and transports the medium from the inlet to the outlet. The vertical nitrogen air seal cooling magnetic force submerged slurry pump is widely used in the production process of chemical industry, petroleum, refining, pharmaceutical and other fields to transport toxic and harmful media, media with high solid particle content, media with high gas content, media close to boiling point, Containing toxic gas medium, flammable and explosive medium and corrosive medium, it is especially suitable for the transportation of fine and coarse TiCl4 slurry in the sponge titanium industry and other industrial, mining, and chemical industry slurry media and working conditions that require dry operation.

Claims (1)

1. A vertical nitrogen gas seal cooling magnetic liquid slurry pump, including pump body (1), bearing seat (6), pump cover (3), characterized in that: the bearing seat (6) passes through The bearing (17) is provided with a pump shaft (7), the bearing seat (6) is connected with a nitrogen port (18) through a small hole, the bearing seat (6) is provided with an upper connecting pipe (13), and the upper connecting pipe (13) is provided with There is a motor (12), and the flange of the upper connecting pipe (13) is set on the mounting plate (14); the lower connecting pipe (5) is arranged under the bearing seat (6), and the pump body (1) is arranged under the lower connecting pipe (5) , The side of the pump body (1) is connected with a liquid outlet pipe (4) through a flange; the pump body (1) below the pump shaft (7) is provided with an impeller (2) and an impeller nut ( 20); the upper connecting pipe (13) above the pump shaft (7) is provided with an inner magnetic rotor assembly (8), the outer ring of the inner magnetic rotor assembly (8) is provided with a spacer (11), and the top of the spacer (11) is provided with The outer magnetic rotor assembly (10), the outer magnetic rotor assembly (10) is connected to the shaft of the motor (12); the bearing (17) is a non-grease lubricating rolling bearing; the isolation sleeve (11) is made of non-metallic material Manufacturing; the bearing seat (6) increases the axial distance between the two bearings, shortens the cantilever length of the shaft extension, does not set any sliding bearing on the rotating part, and the back of the impeller (2) is provided with a back blade.