CN215805371U

CN215805371U - Secondary sealing device for horizontal magnetic pump

Info

Publication number: CN215805371U
Application number: CN202122010681.8U
Authority: CN
Inventors: 汤奇; 董亿敬
Original assignee: Dalian Luolan Pump Manufacture Co ltd
Current assignee: Dalian Luolan Pump Manufacture Co ltd
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2022-02-11
Anticipated expiration: 2031-08-25

Abstract

The utility model discloses a secondary sealing device for a horizontal magnetic pump, which relates to the technical field of horizontal magnetic pumps and comprises a driving bearing box, wherein a main shaft is rotationally connected in the driving bearing box, one end of the driving bearing box is fixedly connected with a support, one end of the main shaft is communicated with a permanent magnet coupling in the support, an isolation sleeve is arranged in the permanent magnet coupling, a dry gas seal is arranged between the other end of the driving bearing box and the main shaft, an air inlet pipe is arranged above the side wall of the dry gas seal, an air outlet pipe is arranged below the side wall of the support, the air outlet pipe is communicated with a connecting pipe, the other end of the connecting pipe is communicated with a liquid level meter seat, a cavity is arranged in the liquid level meter seat, an electromagnetic valve is arranged on one side wall of the liquid level meter seat, the device can detect the entering liquid through a liquid level meter and transmits signals to an external controller through a lead, the electromagnetic valve is controlled to be closed through the external controller, and secondary sealing is achieved.

Description

Secondary sealing device for horizontal magnetic pump

Technical Field

The utility model relates to the technical field of horizontal magnetic pumps, in particular to a secondary sealing device for a horizontal magnetic pump.

Background

The magnetic pump is widely applied to the transportation of toxic media containing solid particles, toxic gas media and media close to boiling point in the fields of chemical industry, petroleum, refining, pharmacy and the like. The magnetic driving device which is coupled by special intensive, magnetic gathering and push-pull magnetic paths has the advantages of compact structure, small volume, large torque, small eddy current, high magnetic transmission efficiency and the like. For example, in the utility model patent with publication number CN201568318U, a horizontal magnetic pump is disclosed, which comprises a pump shaft, an inner magnetic rotor assembly, and a spacer sleeve. An impeller is arranged in an inner cavity formed by the pump body and the pump cover, the impeller is sleeved on the pump shaft, and the top end of the impeller is locked by an impeller nut. The right end of the pump cover is connected with the bearing seat, a bearing B is arranged at the left end of the upper portion of the pump shaft in the inner cavity of the bearing seat, a bearing A is arranged at the right end of the upper portion of the pump shaft, and a nitrogen inlet is formed in the lower portion of the left end of the bearing seat. The right end of the bearing seat is connected with the connecting frame, an inner magnetic rotor assembly is arranged in the center of the inner cavity of the connecting frame, an isolating sleeve is sleeved on the inner magnetic rotor assembly, an outer magnetic rotor assembly is arranged on the outer ring of the isolating sleeve, and a motor is arranged at the right end of the connecting frame. The utility model discloses a power seal structure reduces the material to impeller back end pressure. The nitrogen gas seal between the bearings can prevent medium steam from leaking, and simultaneously, the heat dissipation between the bearings and the outer magnetic rotor assembly and the inner magnetic rotor assembly is cooled. The ceramic isolation cover has no electromagnetic eddy current and demagnetization. The service life of pump has been prolonged, the cost is reduced, however, the device does not possess secondary seal function, when the ceramic shield became invalid, can lead to liquid to reveal, easily takes place the incident.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides a secondary sealing device for a horizontal magnetic pump, which solves the technical problem that the prior device can cause liquid leakage when a ceramic isolation cover fails.

In order to achieve the purpose, the utility model is realized by the following technical scheme: the utility model provides a secondary seal device for horizontal magnetic drive pump, includes the drive bearing case, drive bearing incasement internal rotation is connected with the main shaft, drive bearing case one end rigid coupling has the support, main shaft one end just is located support in-connection has the permanent magnet coupling, install the separation sleeve in the permanent magnet coupling, the drive bearing case other end with it is sealed to install dry gas between the main shaft, dry gas seals up the lateral wall top and is equipped with the intake pipe, support lateral wall below is equipped with the outlet duct, the outlet duct intercommunication has the connecting pipe, the connecting pipe other end intercommunication has the level gauge seat, seted up the cavity in the level gauge seat, the solenoid valve is installed to level gauge seat lateral wall, the solenoid valve with the cavity is linked together, the level gauge is installed to the level gauge seat upper wall, the level gauge sense terminal is arranged in the cavity.

Preferably, a flow regulating valve is installed at the outlet end of the electromagnetic valve.

Preferably, the liquid level meter is a tuning fork liquid level meter.

Preferably, the upper wall surface of the driving bearing box is fixedly connected with a hoisting ring.

Advantageous effects

The utility model provides a secondary sealing device for a horizontal magnetic pump, which has the following beneficial effects that a sealed cavity can be formed outside a separation sleeve through dry gas sealing, nitrogen can enter a driving bearing box and a support through an air inlet pipe to cool the device, the nitrogen can be discharged into a liquid level meter through an air outlet pipe and a connecting pipe, the flow of the nitrogen can be controlled through a flow regulating valve, when the separation sleeve fails in sealing, the liquid enters the liquid level meter through the air outlet pipe and the connecting pipe, the liquid level meter can detect the entering liquid, signals are transmitted to an external controller through a lead, and an electromagnetic valve is controlled to be closed through the external controller, so that secondary sealing is realized.

Drawings

Fig. 1 is a front view of the internal structure of the present invention.

Fig. 2 is an enlarged schematic view of a in fig. 1.

In the figure: 1-driving the bearing box; 2-a main shaft; 3-a scaffold; 4-permanent magnet coupling; 5-an isolation sleeve; 6-dry gas sealing; 7-an air inlet pipe; 8-air outlet pipe; 9-connecting pipe; 10-a level gauge stand; 11-a cavity; 12-a solenoid valve; 13-a liquid level meter; 14-a flow regulating valve; 15-hoisting ring.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a secondary sealing device for a horizontal magnetic pump comprises a driving bearing box 1, a main shaft 2 is rotationally connected in the driving bearing box 1, a support 3 is fixedly connected to one end of the driving bearing box 1, a permanent magnet coupler 4 is communicated with one end of the main shaft 2 and positioned in the support 3, an isolation sleeve 5 is installed in the permanent magnet coupler 4, a dry gas seal 6 is installed between the other end of the driving bearing box 1 and the main shaft 2, an air inlet pipe 7 is arranged above the side wall of the dry gas seal 6, an air outlet pipe 8 is arranged below the side wall of the support 3, the air outlet pipe 8 is communicated with a connecting pipe 9, the other end of the connecting pipe 9 is communicated with a liquid level meter seat 10, a cavity 11 is formed in the liquid level meter seat 10, an electromagnetic valve 12 is installed on one side wall of the liquid level meter seat 10, the electromagnetic valve 12 is communicated with the cavity 11, and a liquid level meter 13 is installed on the wall of the liquid level meter seat 10, the detection end of the liquid level meter 13 is arranged in the cavity 11; a flow regulating valve 14 is arranged at the outlet end of the electromagnetic valve 12; the liquid level meter 13 is a tuning fork liquid level meter; and a hoisting ring 15 is fixedly connected to the upper wall surface of the driving bearing box 1.

The following components are provided according to the scheme:

dry gas seals, i.e., "Dry Running gas seals", are a new type of shaft end seal that uses the grooved sealing technique for gas sealing, and belong to the non-contact sealing. When the rotating ring with the hydrodynamic groove arranged on the outer side of the end surface rotates, the hydrodynamic groove pumps high-pressure isolation gas on the outer diameter side (called as the upstream side) into the space between the sealing end surfaces, the pressure of the gas film gradually increases from the outer diameter to the groove diameter, the pressure of the gas film gradually decreases from the groove diameter to the inner diameter, the opening force formed by the increase of the film pressure of the end surface is larger than the closing force acting on the sealing ring, and a very thin layer of gas film is formed between the friction pairs, so that the sealing work is in a non-contact state. The gas film formed completely blocks the relatively low-pressure sealing medium leakage path, and zero leakage or zero escape of the sealing medium is realized.

All the electrical components in the present application are connected with the power supply adapted to the electrical components through the wires, and an appropriate controller should be selected according to actual conditions to meet the control requirements, and specific connection and control sequences should be obtained.

Example (b): as can be seen from the attached figures 1-2 of the specification, when in use, the air inlet pipe 7 is communicated with an external nitrogen tank, the liquid level meter 13 and the electromagnetic valve 12 are respectively communicated with an external controller and an external power supply through leads, a sealed cavity is formed outside the isolation sleeve 5 through the dry gas seal 6, nitrogen enters the driving bearing box 1 and the bracket 3 through the air inlet pipe 7, the device is cooled, nitrogen can be discharged into the liquid level meter 10 through the air outlet pipe 8 and the connecting pipe 9, the electromagnetic valve 12 is normally open, the flow of nitrogen can be controlled through the flow regulating valve 14, when the sealing of the isolation sleeve 5 fails, liquid enters the liquid level meter 10 through the air outlet pipe 8 and the connecting pipe 9, the liquid level meter 13 can detect the entering liquid, the signal is transmitted to the external controller through a lead, the electromagnetic valve 12 is controlled to be closed through the external controller, and secondary sealing is realized.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A secondary sealing device for a horizontal magnetic pump comprises a driving bearing box (1) and is characterized in that a main shaft (2) is connected in the driving bearing box (1) in a rotating mode, a support (3) is fixedly connected to one end of the driving bearing box (1), a permanent magnet coupler (4) is communicated with one end of the main shaft (2) and located in the support (3), an isolation sleeve (5) is installed in the permanent magnet coupler (4), a dry gas seal (6) is installed between the other end of the driving bearing box (1) and the main shaft (2), an air inlet pipe (7) is arranged above the side wall of the dry gas seal (6), an air outlet pipe (8) is arranged below the side wall of the support (3), a connecting pipe (9) is communicated with the air outlet pipe (8), the other end of the connecting pipe (9) is communicated with a liquid level meter seat (10), and a cavity (11) is formed in the liquid level meter seat (10), solenoid valve (12) are installed to level gauge seat (10) a lateral wall, solenoid valve (12) with cavity (11) are linked together, level gauge (13) are installed to level gauge seat (10) last wall, level gauge (13) sense terminal is arranged in cavity (11).

2. The secondary sealing device for the horizontal magnetic pump as claimed in claim 1, wherein the outlet end of the solenoid valve (12) is provided with a flow regulating valve (14).

3. The secondary sealing device for a horizontal magnetic pump according to claim 1, characterized in that the level gauge (13) is a tuning fork level gauge.

4. The secondary sealing device for the horizontal magnetic pump is characterized in that a hoisting ring (15) is fixedly connected to the upper wall surface of the driving bearing box (1).