CN204357762U - A kind of nitrogen spring seal arrangement for ventilator - Google Patents

Abstract

A nitrogen spring sealing device for a fan, which includes a sealing sleeve sleeved on the main shaft at the tail end of the fan; one end of the sealing sleeve is fixedly connected to the tail end of the fan through a sealing disc, and the other end is fixedly connected to the gland through a bolt ;The main shaft is respectively equipped with a front carbon ring and a rear carbon ring which are nested with each other; one side of the front carbon ring is inserted into the limit column II inside the sealing disc, and the other side is connected to the middle of the sealing sleeve through the spring II. The fixed plate is elastically connected; one side of the rear carbon ring is inserted into the limit post I inside the gland, and the other side is elastically connected to the fixed plate in the middle of the sealing sleeve through spring I; the front carbon ring and the rear carbon ring A wear-resistant coating is provided on the joints with the main shaft respectively; the top and the bottom of the sealing sleeve are respectively provided with a nitrogen inlet and a nitrogen outlet which are perpendicular to each other and correspond to the fixed plate. The utility model solves the technical problems of complex structure, poor sealing effect and time-consuming maintenance in the prior art.

Description

A nitrogen spring sealing device for ventilator

technical field

The utility model belongs to the technical field of fan sealing, in particular to a nitrogen spring sealing device for a fan.

Background technique

In the prior art, the fan is a common equipment that is widely used in the machinery manufacturing industry. Because the fan has the characteristics of simple structure, low manufacturing cost, and large flow rate of gas, it is widely used in metallurgy, building materials, heat treatment, food, It is widely used in various sectors of the national economy and infrastructure construction such as electric power, steel and petrochemical, but when it is used to transport toxic, explosive or corrosive gases, the requirements for gas leakage are getting higher and higher, and even require To zero leakage, for general labyrinth seals, simple floating ring seals or mechanical seals, it is difficult to meet the requirements, and there will inevitably be gas leakage; to solve these problems, the existing technology generally uses two kinds of seals together, such as labyrinth and Floating rings, or mechanical seals and labyrinth seals, although effectively reducing the amount of leakage, have a complex structure and are difficult to repair. After a long period of use, the parts are severely worn, the service life is short, and the cost is high.

Contents of the invention

The purpose of the utility model is to solve the technical problems of complex structure, poor sealing effect and time-consuming maintenance in the prior art, and provide a nitrogen spring sealing device for ventilators to overcome the deficiencies of the prior art.

The utility model is a nitrogen spring sealing device for a ventilator, the main point of which is that it includes a sealing sleeve sleeved on the main shaft at the tail end of the fan; one end of the sealing sleeve is fixedly connected with the tail end of the fan through a sealing disc, and the other One end is fixedly connected to the gland through bolts; the main shaft is respectively provided with a front carbon ring and a rear carbon ring which are nested with each other; one side of the front carbon ring is inserted into the limit column II inside the sealing disc. connected, the other side is elastically connected to the fixed plate in the middle of the sealing sleeve through spring II; The fixed plate is elastically connected; the front carbon ring and the rear carbon ring are respectively provided with wear-resistant coatings at the joints of the main shaft; the top and bottom ends of the sealing sleeve are respectively provided with mutually perpendicular Nitrogen inlet and nitrogen outlet.

The front carbon ring and the rear carbon ring are respectively uniformly cut into three sections, and the corresponding clip lines of every two sections are tangent to the inner circumference of the carbon ring.

Rubber pads are respectively provided at the junctions of the sealing disk and the fan side rear panel and the junctions of the sealing sleeve and the sealing disk.

The wear-resistant coating on the main shaft of the fan is coated with aluminum oxide or chromium oxide.

The utility model has simple structure and reasonable design. The fan shaft and the front carbon ring are socketed and sealed, and there is a wear-resistant coating between them. At the same time, the front carbon ring and the sealing plate are bonded and sealed; It is sealed and sealed with the gland, which ensures the airtightness of both ends of the main shaft and forms a first-level seal; nitrogen entering the sealing sleeve will generate high pressure. If the gas leaks from the fan shaft, it will be under the impact of high-pressure gas in the sealing sleeve The top returns to the inside of the fan to form a secondary seal; the double-layer seal can effectively prevent gas leakage. The utility model solves the technical problems of complex structure, poor sealing effect and time-consuming maintenance in the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of the structure of the utility model;

           Fig. 2 is a partially enlarged schematic diagram of A in Fig. 1;

Figure 3 is an enlarged front view of the carbon ring in the utility model.

In the figure 1, main shaft 2, side rear plate 3, sealing disc 4, sealing sleeve 5, nitrogen gas inlet 6, gland 7, limit post Ⅰ 8, rear carbon ring 9, spring Ⅰ 10, nitrogen gas outlet 11, rubber pad 12. Front carbon ring 13. Fixed plate 14. Limit post Ⅱ 15. Spring Ⅱ 16. Wear-resistant coating

According to Fig. 1, Fig. 2 and Fig. 3, the utility model includes a sealing sleeve 4 which is sleeved on the main shaft 1 at the tail end of the fan; one end of the sealing sleeve 4 passes through the sealing disc 3 and the side rear plate of the fan tail 2 is fixedly connected, and the other end is fixedly connected with the gland 6 through bolts; the main shaft 1 is respectively provided with a front carbon ring 12 and a rear carbon ring 8 which are nested therewith; one side of the front carbon ring 12 It is plugged with the limit column II14 inside the sealing disc 3, and the other side is elastically connected with the fixed plate 13 in the middle of the sealing sleeve 4 through the spring II15; one side of the rear carbon ring 8 is connected to the limit column inside the gland 6 I7 is plugged in, and the other side is elastically connected to the fixed plate 13 in the middle of the sealing sleeve 4 through the spring I9; the front carbon ring 12 and the rear carbon ring 8 are respectively provided with a wear-resistant coating 16 at the joints of the main shaft 1 The top and the bottom of the sealing sleeve 4 are respectively provided with a nitrogen inlet 5 and a nitrogen outlet 10 which are perpendicular to each other and corresponding to the fixed plate 13; the front carbon ring 12 and the rear carbon ring 8 are evenly cut into There are three sections, and the corresponding clip lines of every two sections are tangent to the inner circumference of the carbon ring; Rubber pad 11; the wear-resistant coating 16 on the fan main shaft 1 is formed by coating aluminum oxide or chromium oxide.

Working principle: The main shaft of the fan 1 is socketed and sealed with the front carbon ring 12, and there is a wear-resistant coating 16 in between. 1 socket seal, and seal with the inner surface of the gland 6, so as to ensure the airtightness of both ends of the main shaft 1 and form a first-level seal; nitrogen entering the sealing sleeve 4 will generate high pressure, if the gas inside the fan comes from the fan main shaft 1 Leakage will be pushed back to the inside of the fan under the impact of the high-pressure gas in the sealing sleeve 4, forming a secondary seal; the double-layer seal can effectively prevent gas leakage. The sealing disc 3 is fixedly connected with the fan rear side plate 2 with bolts, flat washers and elastic washers, and the sealing disc 3 is circular; the sealing sleeve 4 and the gland 6 are fixedly connected with bolts, flat washers and elastic washers; the sealing sleeve 4 has The nitrogen inlet 5 and the nitrogen outlet 10 are distributed at 180 degrees; the sealing disc 3 is connected with the front carbon ring 12 by the limit column II, and the gland 6 is connected with the rear carbon ring 8 by the limit column I; the sealing sleeve 4, The sealing disc 3 is connected with the fan rear side plate 2 with bolts, flat washers and spring washers. After assembling all the components and adjusting the gaps; start the fan and inject nitrogen gas into the nitrogen inlet 5. After the gas in the fan is sealed by the front carbon ring 12, it will not leak out under the high pressure of the nitrogen gas introduced. Finally, it is discharged from the nitrogen outlet 10.

The front carbon ring 12 and the rear carbon ring 8 in the utility model are respectively milled with 3 radial runways, and the front and rear carbon rings 12 and 8 are respectively cut into three sections of sealing rings. It forms a ring, and the incision of each section of the sealing ring to be cut is an oblique incision, and the tangent line of the oblique incision is tangent to the inner circumference of the carbon ring, so that after the sealing ring is worn, the sections of the adjacent sealing rings are inseparable from each other. Interfere and slide inward along the oblique cut to get close to the main shaft 1, maintain a reasonable fit gap between the carbon ring and the main shaft 1, and reduce leakage; the carbon ring is a graphite carbon ring, so the wear rate is very small. The nitrogen inlet 5 and the nitrogen outlet 10 provided on the sealing sleeve 4 all adopt pants-shaped openings, so that the pressures of the two chambers of the sealing sleeve 4 are balanced, effectively preventing the gas from backflowing back to the fan, and effectively reducing leakage. The sealing sleeve 4 is not directly connected to the fan rear side plate 2, and a sealing disc 3 is added between them to make maintenance more convenient.

The utility model is convenient to overhaul, and the overhaul of the sealing system is changed from dismantling all the original fans to only partly dismantling the end cover. The structure is simple and the cost is low; the sealing performance is good and the service life is long; With sealing ability.

Claims (3)

1. A nitrogen spring sealing device for a fan, characterized in that it includes a sealing sleeve (4) sleeved on the main shaft (1) at the tail end of the fan; one end of the sealing sleeve (4) passes through the sealing disc ( 3) It is fixedly connected to the side rear plate (2) at the tail end of the fan, and the other end is fixedly connected to the gland (6) through bolts; the main shaft (1) is respectively provided with a front carbon ring (12) which is nested with it and the rear carbon ring (8); one side of the front carbon ring (12) is plugged into the limit post II (14) inside the sealing disc (3), and the other side is connected to the sealing post through the spring II (15) The fixed plate (13) in the middle of the sleeve (4) is elastically connected; one side of the rear carbon ring (8) is inserted into the limit post I (7) inside the gland (6), and the other side is connected by the spring I (9) Elastically connected with the fixed plate (13) in the middle of the sealing sleeve (4); the front carbon ring (12) and the rear carbon ring (8) are respectively provided with wear-resistant coating (16); the top and bottom of the sealing sleeve (4) are respectively provided with a nitrogen inlet (5) and a nitrogen outlet (10) perpendicular to each other and corresponding to the fixing plate (13). 2. A nitrogen spring sealing device for ventilators according to claim 1, characterized in that the front carbon ring (12) and the rear carbon ring (8) are respectively uniformly cut into three sections, and The corresponding clip lines of every two segments are tangent to the inner circumference of the carbon ring. 3. A nitrogen spring sealing device for a fan according to claim 1, characterized in that the joint between the sealing disc (3) and the fan side rear plate (2) and the seal sleeve (4) and Rubber pads (11) are respectively provided at joints of the sealing discs (3).