CN218624678U

CN218624678U - Submerged centrifugal pump with integrated dry gas sealing structure

Info

Publication number: CN218624678U
Application number: CN202222849902.5U
Authority: CN
Inventors: 陈建; 雷荣; 时其建
Original assignee: Jiangsu Jianan Pump Co ltd
Current assignee: Jiangsu Jianan Pump Co ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-03-14
Anticipated expiration: 2032-10-27

Abstract

The utility model discloses a submerged centrifugal pump with collection dress formula dry gas seal structure, include: the motor of arranging in proper order along the axis direction, the bearing box, the stay tube, the pump body, the rotation axis is connected to the output of motor, stay tube fixed mounting is in bearing box bottom, the rotation axis passes and stretches into in the stay tube behind the bearing box, pump body fixed mounting is in the stay tube bottom, the impeller of the pump body is connected to the rotation axis bottom, the rotation axis is equipped with sealed letter body subassembly by supreme cover in proper order down, dry gas seal assembly, sealed letter body subassembly fixed mounting is on the stay tube, dry gas seal assembly passes through fastening bolt fixed mounting on sealed letter body subassembly. The utility model discloses compare in prior art, through dry gas seal structure, replace traditional "liquid blocking" principle with "gas blocking", avoid thick titanium tetrachloride material to leak poisonous gas in transportation process.

Description

Submerged centrifugal pump with integrated dry gas sealing structure

Technical Field

The utility model belongs to submerged centrifugal pump field especially relates to a submerged centrifugal pump with collection dress formula dry gas seal structure.

Background

In the production process for producing titanium dioxide by a chlorination method, the produced crude titanium tetrachloride needs to be refined, and the refining mainly comprises the step of removing vanadium in the crude titanium tetrachloride. The solid content in the crude titanium tetrachloride material is about 40 percent, and the components in the crude titanium tetrachloride material are impure and are a mixture containing other materials.

When a submerged pump with a vertical structure is used for conveying a crude titanium tetrachloride material, harmful and toxic gas is generated in the conveying process of the material, and the sealing requirement is high. Because the submerged pump is a vertical cantilever type structure, the pump can swing in the operation process, and the leakage is easy to occur when the mechanical seal is installed. Meanwhile, other media such as water cannot enter the material, flushing, cooling and lubrication need to be considered in the use process of the mechanical seal, the material cannot be flushed by the mechanical seal, and external flushing liquid cannot dissolve with pumped materials, so that the submerged pump cannot use the mechanical seal mode.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the submerged centrifugal pump with the integrated dry gas sealing structure is provided, and the dry gas sealing structure is used for replacing the traditional liquid blocking principle by using gas blocking, so that toxic gas is prevented from leaking from the crude titanium tetrachloride material in the conveying process.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a centrifugal pump under liquid with collection dress formula dry gas seal structure, include the motor of arranging in proper order along the axis direction, the bearing box, the stay tube, the pump body, the rotation axis is connected to the output of motor, stay tube fixed mounting is in bearing box bottom, the rotation axis passes and stretches into in the stay tube behind the bearing box, pump body fixed mounting is in the stay tube bottom, the impeller of the pump body is connected to the rotation axis bottom, the rotation axis is equipped with sealed letter body subassembly by supreme cover in proper order down, dry gas seal assembly, sealed letter body subassembly fixed mounting is on the stay tube, dry gas seal assembly passes through fastening bolt fixed mounting on sealed letter body subassembly.

As a further description of the above technical solution:

the sealing letter body subassembly includes the sealing letter body and the labyrinth body, and the labyrinth body cover is established on the rotation axis, and labyrinth body fixed mounting is in the sealing letter body, and the sealing letter body is through the first flange fixed mounting who arranges along self circumference on the stay tube.

As a further description of the above technical solution:

the dry gas seal assembly comprises two dry gas seals which are sequentially arranged along the axis direction of the rotating shaft 1, a fastening bolt penetrates through the dry gas seal and then is connected to the seal box body in a threaded mode, and a dry gas seal interface used for introducing seal gas is arranged on one side of the dry gas seal.

As a further description of the above technical solution:

the sealing gas is nitrogen.

As a further description of the above technical solution:

the outlet of the pump body is connected with the liquid outlet pipe, the liquid outlet pipe comprises a first pipe body and a second pipe body, and sealing filler is arranged at the joint of the first pipe body and the second pipe body.

As a further description of the above technical solution:

the sealing filler is fluororubber.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses in, the bi-polar face dry gas that sets up on the rotation axis is sealed face to face by two sets of dry gas and is constituteed (or the back to back is constituteed), and sealed gas is nitrogen gas, realizes the sealing to the medium through the sealed of nitrogen gas, and what dry gas seal atmosphere side leaked is only trace nitrogen gas. In the submerged centrifugal pump, a dry gas sealing structure is adopted, and the traditional liquid blocking principle is replaced by 'gas blocking', so that the leakage of toxic gas from the crude titanium tetrachloride material in the conveying process is avoided.

2. The utility model discloses in, sealed letter body subassembly is used for fixed collection dress formula dry gas seal on the one hand, and the labyrinth of the graphite material is adopted to the on the other hand labyrinth, can reach sealed effect when to the material gaseous state. When the nitrogen is introduced from the outside and sealed, the pressure value of the nitrogen is higher than that in the pump, the graphite material can better prevent the corrosive wear of the material, and simultaneously, the cleanliness in the sealing cavity is reduced, so that the dry gas seal can operate for a long time.

3. The utility model discloses in, the drain pipe adopts split type design, is convenient for maintain, and it is convenient to dismantle. The two pipe bodies of the liquid outlet pipe are connected in a sealing mode through the packing, the packing is made of fluororubber, and reaction gas generated in the material conveying process is prevented from escaping.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural view of a submerged centrifugal pump having a cartridge type dry gas sealing structure.

Fig. 2 is a partially enlarged view of a portion a in fig. 1.

Fig. 3 is a schematic structural diagram of a liquid outlet pipe in the submerged centrifugal pump with a cartridge type dry gas sealing structure.

Illustration of the drawings:

1. a motor; 11. a rotating shaft; 2. a bearing housing; 3. supporting a tube; 4. a pump body; 41. an impeller; 5. sealing the letter assembly; 51. sealing the box body; 52. a labyrinth body; 6. a dry gas seal assembly; 61. sealing with dry gas; 611. sealing the interface with dry gas; 7. fastening a bolt; 8. a liquid outlet pipe; 81. a first pipe body; 82. a second tube; 83. and (5) sealing and filling.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a centrifugal pump under liquid with collection dress formula dry gas seal structure, include the motor 1 that arranges in proper order along the axis direction, bearing box 2, stay tube 3, the pump body 4, rotation axis 11 is connected to motor 1's output, 3 fixed mounting in the bearing box 2 bottoms of stay tube, rotation axis 11 passes and stretches into in the stay tube 3 behind the

bearing box

2, 4 fixed mounting in the stay tube 3 bottoms of the pump body, the impeller 41 of the pump body 4 is connected to rotation axis 11 bottom, rotation axis 11 is equipped with sealed letter body subassembly 5 by supreme cover in proper order down, dry gas seal assembly 6, 5 fixed mounting of sealed letter body subassembly are on stay tube 3, dry gas seal assembly 6 passes through fastening bolt 7 fixed mounting on sealed letter body subassembly 5.

The sealing box body assembly 5 comprises a sealing box body 51 and a labyrinth body 52, wherein the labyrinth body 52 is sleeved on the rotating shaft 11, the labyrinth body 52 is fixedly arranged in the sealing box body 51, and the sealing box body 51 is fixedly arranged on the support pipe 3 through a first flange arranged along the circumferential direction of the sealing box body 51. Sealing letter body subassembly 5 is used for fixed collection dress formula dry gas seal on the one hand, and the labyrinth of on the other hand labyrinth body adoption graphite material seals (sealing letter body subassembly 5 promptly), can reach sealed effect when gaseous to the material. When the nitrogen is introduced from the outside and sealed, the pressure value of the nitrogen is higher than that in the pump, the graphite material can better prevent the corrosive wear of the material, and simultaneously, the cleanliness in the sealing cavity is reduced, so that the dry gas seal can operate for a long time.

The dry gas sealing assembly 6 comprises two dry gas seals 61 sequentially arranged along the axial direction of the rotating shaft 11, the fastening bolt 7 penetrates through the dry gas seals 61 and then is connected to the sealing box body 51 in a threaded mode, and a dry gas sealing interface 611 used for introducing sealing gas is arranged on one side of each dry gas seal 61. The sealing gas is nitrogen.

The outlet 8 is connected in the exit of pump body 4, and outlet 8 includes first body 81 and second body 82, and the junction of first body 81 and second body 82 is provided with sealing filler 83. The sealing packing 83 is a fluororubber. The sealing structure of the sealing connection of the packing is adopted at the outlet of the liquid outlet pipe 8 and the outlet of the pump body 4, the sealing performance is ensured, the maintenance and the disassembly are convenient, and the packing is made of corrosion-resistant and wear-resistant high-molecular polyethylene. The drain pipe adopts split type design, and the maintenance of being convenient for, it is convenient to dismantle, adopts filler sealing connection between two bodys of drain pipe 8, and sealing filler 83 is fluororubber, prevents that the reaction gas who produces from overflowing in the material transportation process.

The working principle is as follows: when the submerged centrifugal pump is used, the rotating speed of the rotating shaft 11 is controlled to be n =1450r/min, the wear rate of the pump can be effectively reduced by reducing the rotating speed, the pump can run more stably, meanwhile, the cavitation allowance of the pump with low rotating speed is lower, and cavitation can be effectively prevented. The material of the flow passage component of the pump is CD4MCU, the pump shaft is 35CrMo, and the pump has good mechanical property, erosion resistance and corrosion resistance, and is prevented from being abraded by materials. The double-end-face dry gas seal arranged on the rotating shaft 11 is composed of two sets of dry gas seal faces in a face-to-face mode (or back-to-back mode) to form a container type dry gas seal, seal gas is nitrogen, medium sealing is achieved through nitrogen sealing, and only trace nitrogen leaks from the atmosphere side of the dry gas seal. Through the dry gas sealing structure, the traditional liquid blocking principle is replaced by 'gas blocking', and the leakage of toxic gas in the conveying process of the crude titanium tetrachloride material is avoided. The traditional liquid blocking principle is replaced by 'gas blocking', namely high-pressure sealing liquid is replaced by pressurized sealing gas, and zero leakage of harmful gas during material transportation is guaranteed.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a centrifugal pump under liquid with collection dress formula dry gas seal structure, includes motor (1), bearing housing (2), stay tube (3), the pump body (4) that arrange in proper order along the axis direction, rotation axis (11) is connected to the output of motor (1), stay tube (3) fixed mounting be in bearing housing (2) bottom, rotation axis (11) are passed stretch into behind bearing housing (2) in stay tube (3), pump body (4) fixed mounting be in stay tube (3) bottom, rotation axis (11) bottom is connected impeller (41) of the pump body (4), its characterized in that, rotation axis (11) are equipped with sealed letter body subassembly (5), dry gas seal assembly (6) by supreme cover in proper order down, sealed letter body subassembly (5) fixed mounting be in on stay tube (3), dry gas seal assembly (6) are through fastening bolt (7) fixed mounting be in on sealed letter body subassembly (5).

2. The submerged centrifugal pump with integrated dry gas sealing structure of claim 1, characterized in that the sealing box body assembly (5) comprises a sealing box body (51) and a labyrinth body (52), the labyrinth body (52) is sleeved on the rotating shaft (11), the labyrinth body (52) is fixedly installed in the sealing box body (51), and the sealing box body (51) is fixedly installed on the supporting pipe (3) through a first flange arranged along the circumferential direction of the sealing box body (51).

3. The submerged centrifugal pump with the cartridge type dry gas sealing structure as claimed in claim 1, wherein the dry gas sealing assembly (6) comprises two dry gas seals (61) sequentially arranged along the axial direction of the rotating shaft (11), the fastening bolt (7) is threaded on the sealing box body (51) after passing through the dry gas seals (61), and one side of the dry gas seals (61) is provided with a dry gas sealing interface (611) for introducing sealing gas.

4. The submerged centrifugal pump with a cartridge dry gas seal structure as claimed in claim 3, characterized in that the seal gas is nitrogen.

5. Submerged centrifugal pump with integrated dry gas sealing structure according to claim 1, characterized in that the outlet of the pump body (4) is connected with a liquid outlet pipe (8), the liquid outlet pipe (8) comprises a first pipe (81) and a second pipe (82), and the joint of the first pipe (81) and the second pipe (82) is provided with a sealing filler (83).

6. Submerged centrifugal pump with integrated dry gas seal structure according to claim 5, characterized in that the sealing packing (83) is viton.