RU100150U1 - BITUMEN GEAR PUMP - Google Patents

Abstract

 Gear bitumen pump, containing a welded case, closing covers, inserts, gears, driving and driven shafts, bearings, sealing flanges, characterized in that the inserts are made of cast iron A-HPV-HNMM, hardened to a hardness of 38 ... 46 HRC, sanded over all cylindrical and flat surfaces, and between the housing and the closing covers, control caps are installed that prevent the penetration of the working fluid into the bearing area, while guaranteeing the original size and adjusting the end if necessary howl the gap between the end of the gear and the end of the insert.

Description

Bitumen gear pump belongs to hydraulic machines of volume displacement and is intended for pumping cementitious materials (bitumens of various grades, bitumen emulsions and bitumen with abrasive fillers - dolomite flour, talc, industrial ash). It can be used in road construction equipment.

Known gear pump bitumen DZ-212, manufactured by LLC "SHM" Tool "Bryansk. The bitumen pump consists of a welded housing, two gears, drive and driven shafts, inserts, covers, bearings, sealing flanges, nozzles.

The main disadvantages of the considered pump are:

- the pump casing wears out especially when pumping bitumen with abrasive fillers;

- gears have low wear resistance when pumping bitumen with abrasive fillers;

- cast iron inserts (grade СЧ 15) have low wear resistance when pumping bitumen with abrasive fillers;

self-lubricating pumped ball bearings of the pump have low wear resistance when pumping bitumen with abrasive fillers.

The closest adopted for the prototype is a gear pump bitumen NSh-100 (patent for a utility model - authors: A.P. Pugachev, M.G.Shalygin, patent holder State educational institution of higher professional education "Bryansk State Technical University" (RU), ) The main index on the IPC: F04C 2/00, Published: 05/10/2009).

The presented object is characterized by the following disadvantages:

- the inserts do not have sufficient wear resistance when pumping bitumen with abrasive fillers;

- increased volume of fluid removal through the stuffing box seal on the drive shaft when pumping hot bitumen, which quickly solidifies, complicating the maintenance of the pump;

- the impossibility of technological control of the initial size of the end gap leads to jamming of gears, noise, and a decrease in pump performance.

The purpose of the utility model is to increase reliability in operation, wear resistance, durability, maintainability.

Gear bitumen pump, containing a welded case, closing covers, inserts, gears, driving and driven shafts, bearings, sealing flanges, characterized in that the inserts are made of cast iron A-HPV-HNMM, hardened to a hardness of 38 ... 46 HRC, sanded over all cylindrical and flat surfaces, and between the housing and the closing covers, control caps are installed that prevent the penetration of the working fluid into the bearing area, while guaranteeing the original size and adjusting the face if necessary howl the gap between the end of the gear and the end of the insert.

The inserts are made of cast iron of grade A-VPCh-KhNMM, hardened to a hardness of 38 ... 46 HRC, polished on all surfaces and are the centering element of the body openings and the openings of the covers, inserts made of special cast iron A-VPCh-KhNMM (GOST 3443-87) significantly more wear-resistant when pumping liquids with abrasive fillers. The use of regulating caps allows to reduce the transfer of hot bitumen through the seal to the bearing operating area, significantly improves the maintenance of the pump in operation, allows you to ensure the size of the gap specified by the designer between the gear end and the end of the insert, are installed and fixed on the pump housing and are attached to the inserts with bolts.

Figure 1 shows the main view of the pump, figure 2 is a side view.

A regulating cover 11 is mounted on the housing 1 (Fig. 1) and secured with bolts 12. The inserts 7 and 9 assembled with flanges 10 are lowered together into the housing 1 and are attached to the regulating cover 11 with bolts 13. A gasket is installed on the housing 1 (Fig. 1) 3 and the cover 2 assembly with bearings 5 and is fastened with bolts 4. The driving rotor is connected to the driven rotor and jointly lowered into the housing 1 with subsequent pre-pressing of the rotors 6 and 8 until the bearings 5 stop at the end of the cover 2.

In the housing 1 (Fig. 1), gears 22 and inserts 15, 16 are assembled together with flanges 10. The control cover 17 is mounted on the housing 1 and bolted. The inserts 15 and 16 with the help of bolts 13 are attracted to the control cover 17, until the necessary clearance is established between the gears 22 and the inserts. A gasket 14 is installed on the housing 1 (Fig. 1), the cover 18 with a prepress before combining it with the gasket and are fixed with bolts 4. A stuffing box 19 is installed on the drive shaft 1, a pressure box 20 is installed and fixed with nuts 21.

The pump operates according to the following flow chart. Suction and pressure bitumen pipelines are connected to the flanges 23 of the pump (Fig. 2), steam pipelines for heating the pump housing to the required temperature of the pumped liquid are connected to the bushings 24 (Fig. 2). After warming up the pump, the drive is turned on - the rotation of the rotor shaft of the drive 6 (figure 1). When the gears of the rotors 6 and 8 rotate (FIG. 1), the interdental space is filled with the pumped liquid and the fluid is transferred to the other side of the pump and squeezed into the pressure line. When the direction of rotation is reversed, the flow direction of the pumped liquid changes accordingly.

Thus, the proposed bitumen gear pump allows you to guarantee the size of the gap between the gear end and the insert end, reduce the leakage of the pumped fluid through the stuffing box seals, reduce the ingress of fluid into the bearing area, increase the service life of the pump inserts.

Claims (1)

Gear bitumen pump, containing a welded case, closing covers, inserts, gears, driving and driven shafts, bearings, sealing flanges, characterized in that the inserts are made of cast iron A-HPV-HNMM, hardened to a hardness of 38 ... 46 HRC, sanded over all cylindrical and flat surfaces, and between the housing and the closing covers, control caps are installed that prevent the penetration of the working fluid into the bearing area, while guaranteeing the original size and adjusting the end if necessary howl the gap between the end face of the gear and the end face of the insert.