RU93915U1 - SINGLE MECHANICAL BUTT SEAL OF A HORIZONTAL SLUDGE PUMP - Google Patents

Abstract

 1. A single mechanical end seal of a horizontal slurry pump containing a rotating and non-rotating body, secondary O-shaped sealing elements, a friction pair made in the form of annular cylindrical bushings with clamps, one of which is located in the non-rotating body and spring-loaded, and the second is located in the rotating seal housing, characterized in that the secondary sealing elements in the form of O-rings are located in the seal housing in the area of the nozzle opening l of the pump, as well as from the outer part of the seal housing in the area where the seal housing and the pump housing are connected, and between the friction pair bushings and the seal housings there are secondary sealing elements in the form of O-rings, the seal also contains fixing bolts with the function of fixing the housing on the shaft pump, and between the seal housing and the fixing bolts there is an installation ring, made with the possibility of removal from the seal housing after installing the seal in the pump, and whose function is It is possible to adjust the pressing of the bushings to each other during assembly. ! 2. A single mechanical mechanical seal of a horizontal slurry pump according to claim 1, characterized in that the friction pair bushings are made of SILCAR silicon carbide material.

Description

Application area

The utility model relates to mechanical engineering and can be used in the field of shaft sealing of horizontal slurry pumps. It is used to seal the leakage of drilling fluid between the pump housing and the rotating pump shaft.

State of the art

In the prior art, a single mechanical seal type M1, M1L by ANGA is known [1]. Single mechanical seal, unloaded, multi-spring, independent of the direction of rotation of the shaft, with integral bearing (M1L) or without integral bearing (M1). Seals of the M1 and M1L types are designed for sealing shafts of mixers and reactors in which substances that are not aggressive or environmentally hazardous are processed. Suitable for use with a low pressure rinse aid.

Contains a stationary ring, O-ring, fluid rotary ring, springs, seal housing, mounting bolts, support ring, spacer ring. Connections: coolant inlet and outlet, leak outlet, bearing lubrication point.

Requires installation by specially trained technical personnel. It does not exclude unauthorized rotation of the friction pair on the pump shaft.

Known mechanical seal of the impeller of a centrifugal pump, containing a pair of slip rings, one of which is located on the side of the driven disk and spring-loaded [2].

The lack of compaction is the design complexity, low reliability and fragility due to the high contact pressures in the pair of contact rings created by the spring force in operating modes with pressures lower than design, during pump starts and stops.

A mechanical seal of the impeller of a centrifugal pump is known, comprising an impeller with a drive and a driven disc installed in the housing, two contact rings, one of which is fixedly mounted in the housing, and the second movable ring has an external thread that matches the direction of rotation of the impeller and is screwed into the internal bore of the driven disk [3].

A disadvantage of the known seal is the rapid wear of the contact rings, which leads to the fragility of the seal.

Known mechanical seal of the impeller of a centrifugal pump [4], containing the impeller with a drive and a driven disc, installed in the housing, two contact rings, one of which is fixedly mounted in the housing, and the second, movable, the ring in the driven disk, characterized in that the movable ring is placed in the annular groove of the driven disk and has radial grooves made with an inclined surface in which metal balls are freely placed.

Requires installation by specially trained technical personnel. Does not exclude unauthorized rotation of friction pairs on the pump shaft.

The closest analogue is a basic single mechanical seal for oil pumps, comprising a housing, secondary sealing elements, a friction pair, consisting of non-rotating and rotating sleeves, a cage and sleeve, in which the corresponding sleeves are placed, characterized in that the friction pair bushings are made with cylindrical grooves under the secondary sealing elements [5].

A disadvantage of the known seal is the rapid wear of the contact rings, which leads to the fragility of the seal. Requires installation of specially trained technical personnel. It does not exclude unauthorized rotation of the friction pair on the pump shaft.

The purpose of the utility model is to eliminate the disadvantages inherent in analogues.

Effect: increased durability of the seal, does not require installation by specially trained technical personnel, eliminates unauthorized rotation of the friction pair and seal housing on the pump shaft.

Utility Model Implementation

The claimed technical result is achieved due to the fact that a single mechanical mechanical seal of a horizontal slurry pump containing a rotating and non-rotating body, secondary O-shaped sealing elements, a friction pair made in the form of annular cylindrical bushings with clamps, one of which is located in a non-rotating case and spring-loaded, and the second is located in a rotating seal body, characterized in that the secondary sealing elements in the form of O-rings are distributed laid in the seal housing in the area of the hole for the nozzle on the pump shaft, as well as from the outer part of the seal housing in the area of the seal housing and pump housing, and between the bushings of the friction pair and the seal housings there are secondary sealing elements in the form of O-rings; the seal also contains fixing bolts with the function of fixing the housing on the pump shaft, and between the seal housing and the fixing bolts there is an installation ring made with the possibility of removal from the seal housing after installing the seal in the pump and whose function is to adjust the pressing of the bushings against each other during assembly. In addition, the friction pair bushings are made of SILCAR carbide-silicon material.

Brief Description of the Drawings

Figure 1 shows a constructive sealing device, where 1 is a rotating seal housing, 2 is a non-rotating seal housing, 3 is a spring, 4 and 5 are friction pair bushings, 6, 16, 17 are an O-ring seal, 7 is a pin, 8, 9, 10 - a bolt, 11 - a nut, 12 - an impeller, 13 - a pump shaft, 14 - a pump housing, 15 - an adjusting ring, 18 - a washer.

Utility Model Implementation

To install the seal, do the following:

Remove the impeller (12) from the pump shaft (13). Pull bearing assembly out of pump housing. Place the seal assembly on the pump shaft (with a collar to the motor side) and install the bearing assembly in place. Push the seal assembly into the pump housing, ensuring that there is no gap between the pump housing (14) and the seal housing (2). Secure seal housing (2) with nuts (11). Install and fix the impeller on the pump shaft. Align the bearing assembly, ensuring uniform clearance, along the entire diameter, between the seal housing (1) and (2). Securely mount the bearing assembly. Then, screw the bolts (8) into the pump shaft. Remove the adjusting ring (15). Squirt the seal (3-4 strokes) after unscrewing any one bolt (10). Assemble the pump and rotate the pump shaft manually, making sure that the shaft rotates without jamming together with the housing (1). The bushings (4, 5) are made of silicon carbide material "SILCAR".

O-rings (6, 16, 17) are used to seal the joints between parts.

The presence of an adjustable clamping unit makes it possible to uniformly tighten the sleeve (4) through each spring during assembly and ensures maximum use of its work. The presence of the mounting ring in the design allows you not to rely much on the personnel who will install this seal into the pump, as thanks to this ring, the preload of the bushings will already be adjusted by the manufacturer and personnel will only need to break and remove the installation ring after installing and tightening the bolts (8).

The use of bolts (8) does not allow the unauthorized rotation of this housing on the shaft (13) of the pump.

As a result, seal life is extended. When replacing three standard seals during pump operation, it is usually necessary to replace the pump parts due to wear when installing the fourth standard seal. When applying the claimed seal this is not required. The result is serious savings. All of the above provides a technical result, as well as the use of silicon carbide material "SILCAR" for the manufacture of a friction pair extends the life of these seals.

Information sources:

1.http: //www.infopumps.ru/page/29-2015_2_b.html

2. A.C. USSR 152177

3. Patent RU 2178840

4. Patent RU 2289041

5. Patent RU 8763 U1

Claims (2)

1. A single mechanical end seal of a horizontal slurry pump containing a rotating and non-rotating body, secondary O-shaped sealing elements, a friction pair made in the form of annular cylindrical bushings with clamps, one of which is located in the non-rotating body and spring-loaded, and the second is located in the rotating seal housing, characterized in that the secondary sealing elements in the form of O-rings are located in the seal housing in the area of the nozzle opening l of the pump, as well as from the outer part of the seal housing in the area where the seal housing and the pump housing are connected, and between the friction pair bushings and the seal housings there are secondary sealing elements in the form of O-rings, the seal also contains fixing bolts with the function of fixing the housing on the shaft pump, and between the seal housing and the fixing bolts there is an installation ring, made with the possibility of removal from the seal housing after installing the seal in the pump, and whose function is It is possible to adjust the pressing of the bushings to each other during assembly. 2. A single mechanical mechanical seal of a horizontal slurry pump according to claim 1, characterized in that the friction pair bushings are made of SILCAR silicon carbide material.