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CN-224229762-U - Reverse return pipe exhaust treatment device of canned motor pump

CN224229762UCN 224229762 UCN224229762 UCN 224229762UCN-224229762-U

Abstract

The utility model relates to a reverse backflow pipe exhaust treatment device of a shielding pump, which comprises a spherical tank, a shielding pump, a liquid separating tank, a communicating pipe, a bottom pump, a backflow pipe and a shielding pump, wherein the bottom of the spherical tank is provided with a filling opening, the shielding pump is connected with the filling opening of the spherical tank, the shielding pump is provided with a reverse backflow opening, one end of the reverse backflow pipe is connected with the reverse backflow opening of the shielding pump, the liquid separating tank is arranged on one side of the spherical tank, the other end of the reverse backflow pipe is connected with a liquid inlet of the liquid separating tank, one end of the communicating pipe is connected with a gas phase interface of the liquid separating tank, the other end of the communicating pipe is connected with a gas phase space of the spherical tank, and the inlet of the bottom pump is connected with a liquid outlet of the liquid separating tank.

Inventors

  • GAO CHUNGUANG
  • TIAN JINGJING
  • FAN XULONG
  • JING SONG

Assignees

  • 山东滨华新材料有限公司

Dates

Publication Date
20260512
Application Date
20250627

Claims (6)

  1. 1. A canned motor pump reverse return flow exhaust treatment device, characterized by comprising: The bottom of the spherical tank (1) is provided with a filling opening; the shielding pump (4) is connected to the filling port of the spherical tank (1), and a reverse backflow port is arranged on the shielding pump (4); One end of the reverse return pipe (5) is connected with a reverse return port of the canned motor pump (4); The liquid separating tank (2) is arranged at one side of the spherical tank (1), and the other end of the reverse return pipe (5) is connected to a liquid inlet of the liquid separating tank (2); One end of the communicating pipe (3) is connected with a gas phase interface of the liquid separating tank (2), and the other end is connected with a gas phase space of the spherical tank (1); a bottom pump (6) with an inlet connected with a liquid outlet at the bottom of the liquid separating tank (2); And a return pipe (7) with one end connected to the outlet of the bottom pump (6) and the other end connected to the inlet pipeline of the shielding pump (4).
  2. 2. The exhaust treatment device of the reverse return pipe of the canned motor pump according to claim 1 is characterized in that the installation height of the liquid separating tank (2) is lower than the height of the spherical tank (1).
  3. 3. The exhaust treatment device of the reverse return pipe of the canned motor pump according to claim 2 is characterized in that the connection point of the communicating pipe (3) and the spherical tank (1) is positioned at the gas phase top of the spherical tank (1).
  4. 4. A reverse return pipe exhaust gas treatment device of a canned motor pump according to claim 3, wherein the bottom pump (6) is a canned motor pump or a centrifugal pump.
  5. 5. A reverse flow return pipe exhaust gas treatment device of a canned motor pump according to claim 4, characterized in that the position where the return pipe (7) is connected to the inlet line of the canned motor pump (4) is located at the front end of the inlet valve of the canned motor pump (4).
  6. 6. The device for treating exhaust gas of a reverse return pipe of a canned motor pump according to claim 5 is characterized in that a liquid level meter is arranged in the liquid separating tank (2) and used for controlling the start and stop of the bottom pump (6).

Description

Reverse return pipe exhaust treatment device of canned motor pump Technical Field The utility model relates to an exhaust treatment device, in particular to a reverse return pipe exhaust treatment device of a canned motor pump. Background In the petrochemical industry, the canned motor pump is very widely used as a sealless pump. The pump and drive motor are sealed in a pressure vessel filled with the pumping medium, which is only static sealed and provides a rotating magnetic field through the wire windings to drive the rotor. The structure eliminates the rotary shaft sealing device of the traditional centrifugal pump, can realize no leakage completely, and achieves the purposes of heat dissipation and lubrication by means of media. Currently, the predominant forms of canned motor pump include basic, reverse-flow, and others. When the saturated vapor pressure of the medium is large, a basic type shielding pump is usually selected to convey the medium, and when the medium is easy to vaporize, a reverse reflux type shielding pump is more suitable to be selected. The tail end of the reverse reflux type shielding pump is provided with a reverse reflux pipe which is required to be connected with a gas phase region of the liquid suction tank, so that the purpose is to ensure that gas phase generated by heat dissipation in the shielding pump can be fully discharged to the liquid suction tank, and the accumulation of the gas phase in the shielding pump is reduced, thereby ensuring that parts such as a bearing, a shielding sleeve and the like of the shielding pump are well lubricated and cooled. Generally, the lift of the reverse return pipe at the tail end of the canned motor pump is about 20% of the lift of the canned motor pump. However, when a canned pump is used in a spherical tank zone location above 4000m 3, the reverse flow line of the pump needs to be connected to the gas phase zone at the top of the spherical tank. In this case, when the canned motor pump is operated, the gas and liquid materials in the reverse return pipe need to overcome a certain height difference to be returned to the gas phase region of the spherical tank. When the shielding pump with smaller lift is selected and the conveyed materials are easy to liquefy, most of gas phase generated by the operation of the shielding pump can be converted into liquid phase, so that the gas phase cannot smoothly return to the gas phase area at the top of the spherical tank. In this way, the gas phase can be continuously accumulated in the shielding pump for a long time, and finally the bearing of the shielding pump cannot be sufficiently lubricated and cooled, so that faults occur. This results in too short a service life of the canned motor pump to allow for long-term stable operation under such conditions. Disclosure of utility model In order to overcome the defects in the prior art, the utility model provides the exhaust treatment device of the reverse return pipe of the canned motor pump, which effectively solves the problems in the background art. In order to achieve the above purpose, the utility model provides the following technical scheme that the utility model comprises the following steps: The bottom of the spherical tank is provided with a filling opening; The shielding pump is connected with the filling port of the spherical tank and is provided with a reverse backflow port; one end of the reverse return pipe is connected with a reverse return port of the canned motor pump; the liquid separating tank is arranged at one side of the spherical tank, and the other end of the reverse return pipe is connected to a liquid inlet of the liquid separating tank; One end of the communicating pipe is connected with a gas phase interface of the liquid separating tank, the other end is connected with the gas phase space of the spherical tank; the inlet of the bottom pump is connected with a liquid outlet at the bottom of the liquid separating tank; a return pipe, one end of which is connected with the outlet of the bottom pump, the other end is connected to the inlet line of the canned motor pump. Preferably, the installation height of the liquid separating tank is lower than that of the spherical tank. Preferably, the connection point of the communicating pipe and the spherical tank is positioned at the gas phase top of the spherical tank. Preferably, the bottom pump is a canned motor pump or a centrifugal pump. Preferably, the location at which the return line is connected to the canned motor pump inlet line is at the front end of the canned motor pump inlet valve. Preferably, a liquid level meter is arranged in the liquid separating tank and used for controlling the start and stop of the bottom pump. The reverse return pipe has the beneficial effects of reducing the resistance of the reverse return pipe for returning gas and liquid phase, ensuring the smoothness of the reverse return pipe, avoiding the situation that all the reverse pipe and the sphe