RU174568U1 - DEVICE FOR COLLECTING OIL LEAKS ON REDUCERS OF ROCKING MACHINES - Google Patents

Abstract

The device is designed to collect oil leaks from gearboxes of pumping units. The device comprises a drainage hose and an oil deflector disk mounted on the gearbox shaft, a cover of the shaft bearing assembly with a split cover-tank mounted on top of it, connected to the upper end of the drainage hose, the lower end of which is connected to the gear drain plug, which, in turn, is connected with gear housing for collecting draining oil. Moreover, the split cover-capacity is installed on top of the cover of the shaft bearing assembly in the mounting holes by means of elongated bolts, and a paronite gasket is installed between the cover of the bearing assembly of the shaft and the split cover-capacity. In a split lid-tank installed prefabricated bath for the accumulation of oil, containing a viewing window made of transparent material. The technical result consists in increasing the efficiency of preventing oil leaks on the gearboxes of the pumping units that do not have a shaft seal. 4 s.p. f-ly, 4 ill.

Description

The utility model relates to the field of engineering, in particular to gearboxes of pumping units, and is intended for use in the oil and gas industry to eliminate oil leaks on gearboxes of pumping units (SC) that do not have a shaft seal.

A device for the vacuum collection of oil from gearboxes of pumping units (AS SU No. 732616, IPC F16N 31/00, F16N 37/00, publ. 05/05/1980), containing a vacuum tank connected to a vacuum pump, and a receiving pipe with a crane, and provided with a tank for collecting waste oil, the volume of the vacuum tank is equal to the volume of a portion of oil in the crankcase of one gearbox, and the collection tank is connected to the vacuum tank by a drain pipe with a crane.

It is known the shaft seal of the gearbox (RU No. 146480, IPC F16J 15/54, publ. 10/10/2014), closest in technical essence to the claimed device and adopted as a prototype, comprising a housing and an oil deflector disk clamped by screws, an oil drain line mounted on the gearbox or another device, the case and the oil-reflecting disk made detachable, while the case has a nipple in the lower part for connecting the oil drain line, and the seams between the parts of the disk are sealed with oil-resistant material.

However, the known analogues are not intended for gearboxes of rocking machines (SC), which do not have a stuffing box shaft seal, have a complex structure and installation of a gearbox on the shaft, and do not allow preventing oil leakages quite effectively.

To date, NGDU Almetyevneft operates 2078 ground-based drives of sucker-rod pumps (SHGN). As you know, almost the entire fund of SHGN drives has fulfilled its normative life, and therefore there is a very acute problem of maintaining the SK fund not only in working condition, but also in accordance with the requirements in the field of industrial safety, labor protection and the environment. The biggest problem is oil passes through the gearbox shaft. So, today in NGDU "Almetyevneft" operates about two hundred pumping units with oil passes. Omission of SK gearboxes oil adversely affects the environmental situation, which may result in supervisory penalties for the company. Also, missing oil spoil the appearance of the rocking machine and violate the paintwork. Another very important problem that oil leaks entail is that the gearbox is jammed due to lower oil levels. When the gearbox is jammed, it is necessary to carry out the overhaul of the gearbox, which requires a significant financial investment, and also entails a long idle time of the well.

Gearbox shaft seals must be reliable and durable. the performance of the bearings depends on this. Various types of seals used in bearing assemblies are designed both to prevent leakage of grease from the housing in which the bearing is installed, and to prevent dust, scale, liquids and other harmful environments from penetrating into the bearing. Oil leakage through seals from bearing housings leads to unproductive consumption of lubricants and careless appearance of equipment. Oil, falling on the foundation, destroys it.

Existing designs of gearboxes of the pumping unit can be divided into 2 groups. The first group consists of gearboxes with a shaft seal. Sealing is achieved by pressing the stuffing box packing against the rotating shaft. Cotton, hemp and asbestos materials are most often used as stuffing box packing.

The listed gaskets can be used at pressures of 0.6–4 MPa, depending on the temperature and the impregnating composition used. Impregnation is used to improve sealing and reduce the coefficient of friction of the packing on the shaft. For impregnation of the packings, lard, paraffin, bitumen, graphite, water glass, grease, viscose, etc. are used.

Of the above packings, fluoroplast should be noted. It has a low coefficient of friction; therefore, its service life is several tens of times longer than that of other materials. It also contributes to its high chemical resistance. The disadvantages of fluoroplastic are relatively high hardness (which requires great effort when tightening the gland) and high cost. These disadvantages are eliminated in the packing of asbestos cord impregnated with a fluoroplastic suspension.

The second group consists of gearboxes with a labyrinth and combined (labyrinth-gap) shaft seal. A labyrinth seal is a series of alternating small axial or radial gaps between rotating and stationary parts.

The elimination of oil leaks on these gearboxes is not eliminated in the field and can only be done with major repairs in basic conditions. This method requires the dismantling of the gearbox, its removal to the repair base for overhaul with the replacement of nodes.

The problem the utility model aims to solve is to create a reliable and simple device to prevent oil leaks on gearboxes of rocking machines without a shaft seal.

The technical result, which the utility model aims to achieve, is to increase the efficiency of preventing oil leaks on the gearboxes of the pumping units that do not have a shaft seal.

The inventive device can prevent oil loss, as well as to avoid environmental pollution.

The inventive device is illustrated in the drawings:

In FIG. 1 shows a diagram of a device;

In FIG. 2 shows an oil deflector disk;

In FIG. 3 shows a gear plug;

In FIG. 4 shows a gearbox mounted device.

The inventive device consists of the following elements:

1 - a cover of a bearing assembly of a shaft;

2 - split cover-capacity;

3 - drainage hose;

4 - drain plug.

The split lid-container 2 consists of two semicircles (semicircular parts), when connected, when assembling the device, the lid-container 2 takes a circular shape. This form provides the convenience and speed of mounting on the gearbox in the field.

In the split lid-tank 2 there is a prefabricated bath for the accumulation of oil dripping from the bearings. This process is continuous. The oil from the collection bath, as it accumulates, flows through the drain hose 3.

The collection bath contains a pipe for connecting the drainage hose 3.

The lid-container 2 is mounted on top of the cover of the bearing assembly of the shaft 1 in the mounting holes by means of elongated bolts.

A paronite gasket is installed between the cover of the bearing assembly of the shaft 1 and the cover-capacity 2 to eliminate oil leaks between them.

A disk-oil deflector is installed on the gearbox shaft (Fig. 2), which serves to cut off the oil flow and direct it to the gearbox housing. The disk scraper has the form of a torus.

The drain plug 4 (Fig. 3) contains two nozzles for connecting the drain hose 3, which also connects to the lid-container 2.

The drainage hose 3 with its upper end is connected to the split cover-capacity 2, and the lower end is connected to the drain plug 4.

All oil leaks from the bearings of the gearbox are collected in the lid-tank 2 in which the bathtub for collecting oil is installed, and flow down the drain hose 3 back to the gearbox housing, in which the collection bath with the nozzle is installed, due to the fact that the oil level in the gearbox is lower than in the driven shaft of the gearbox.

According to one embodiment, the prefabricated bath installed in the lid-container 2 contains a viewing window made of a transparent material for visual determination of the stage of filling with glass oil.

The prefabricated bath can be installed in the lower part of the lid-container 2 and has a shape that repeats the shape of the lower part of the lid-container 2, and is connected to it in any way that provides a fixed reliable connection. At the same time, the prefabricated bath pipe is designed to connect the prefabricated bath to the drainage hose 3 and is located in close proximity to the hole for the drainage hose 3.

A viewing window of transparent material can be located mainly in the lower part of the bath for easy inspection by the operator and can occupy most of the surface of the bath.

In another embodiment, instead of a viewing window, an oil dipstick is used to determine the level of accumulated oil.

The gear housing contains a viewing window made of a transparent material for visual determination of the stage of filling with glass oil.

The inventive device for collecting oil leaks is easy to manufacture and install (Fig. 4). Installing the device on the gearbox takes no more than thirty minutes and is carried out by two repairmen.

The oil splash disk is mounted on the gearbox shaft.

The holes on the device have a diameter larger than the diameter of the studs. The inner diameter of the oil deflector is equal to the diameter of the gearbox shaft.

The crankcase is filled during maintenance. The filling moment is determined using an oil dipstick and pouring the prescribed amount of oil into the gearbox.

The claimed device is essentially a closed drainage system, and oil is refilled by repair personnel during maintenance only if necessary.

The device operates as follows.

The oil flowing from the bearings of the gearbox shaft encounters an obstacle in the form of an oil deflector disk, which directs the oil to a split cover-tank 2 mounted on the cover 1 of the shaft bearing assembly, which accumulates in the collection bath installed in the cover-tank 2 with a nozzle.

Further, as oil accumulates from the collection bath, connected through a pipe to the drainage hose, flows through the drainage hose 3 to the drain plug 4, through which it flows back into the gear housing.

The claimed device can significantly increase the life of the gears and eliminates the ingress of oil into the soil.

Thus, the introduction of a system for collecting oil leaks allows eliminating oil gaps on the gearbox shaft without major repairs, ensures that rocking machines are brought to regulatory and technical requirements, and also ensures the safety of their paintwork.

The device is simple to manufacture and install, requires no maintenance during operation, and its use is possible on all types of gearboxes of pumping units.

Installation of the device does not require intervention in the factory design of the gearbox of the rocking machine.

Today, NGDU Almetyevneft operates about two hundred pumping units with unrecoverable oil passes along the gearbox shaft. To carry out a systematic overhaul of such a number of gearboxes will require at least five years, while the manufacture and implementation of an oil leakage collection system can be carried out within one year.

Claims (5)

1. A device for collecting oil leaks on gearboxes of rocking machines, comprising a drainage hose, a disk-oil deflector mounted on the gearbox shaft, a cover of the shaft bearing assembly with a split cover-tank mounted on top of it, connected to the upper end of the drainage hose, the lower end of which is connected to gear drain plug, which, in turn, is connected to the gear housing to collect the draining oil, and a split cover-tank is installed on top of the shaft bearing assembly cover in the mounting holes through long elongated bolts, and between the cover of the bearing assembly of the shaft and the cover-tank there is a paronite gasket, characterized in that a split bath is installed in the split cover-tank for the accumulation of oil, containing an inspection window made of a transparent material. 2. The device according to claim 1, characterized in that the drain plug and the collection tank contain nozzles for connecting a drainage hose. 3. The device according to claim 1, characterized in that the split lid-container consists of two semicircular parts. 4. The device according to claim 1, characterized in that the disk-oil deflector has the shape of a torus. 5. The device according to p. 1, characterized in that the inner diameter of the oil-reflector disk is equal to the diameter of the gearbox shaft.

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