SU997737A1 - Filter - Google Patents

Description

(54) FILTER

1 The invention relates to filtering, in particular to cartridge filters for cleaning liquid and gas, and can be used in the hydraulic and air systems of machine tools and other aggregates.

Known filter, comprising a housing, a cover, two filtratingist, their element and the relief valve 1.

However, the presence of a valve complicates the design of the filter and shortens its service life.

A filter is known that contains a housing, a lid with an inlet duct, made in the form of an expansion nozzle, its nozzle, concentrically mounted inner and outer filter elements fixed at one end to the lid 2.

The disadvantage of the filter is its short service life due to driving of the internal filter element.

The aim of the invention is to increase the service life of the filter.

The goal is achieved by the fact that the filter, comprising a housing, a lid with an inlet channel made in the form of an expanding nozzle, concentrically mounted inner and outer filter elements and fixed at one end on the lid, is equipped with a transition sleeve installed between the lid and the inner filter element wherein a radial hole is made in the wall of the sleeve, the diameter of which is 0,, 52 of the diameter of the inlet channel, and its area is 0.1-0.2 of the living surface area of the internal filter element.

The drawing shows a filter, a general view.

ten

The filter consists of a housing 1, an internal filter element 2, an external filter element 3, an adapter sleeve 4 mounted on the lid 5. A radial 15 hole 6 is made in the side wall of the sleeve 4. The inlet 7 is made in the lid in the form of an expanding nozzle. The housing G has an output channel 8. The diameter of the radial hole is 0.36-0.52 of the diameter of the input channel 7, and its area is 0.1; -0.2 the living area of the internal filter element 2.

Making a radial orifice less than 0.36 inlet diameter leads to an increase in the pressure drop across it, the force applied to the internal filter element from

differential requires additional hardening, which complicates the design. Making a radial orifice greater than 0.52 of the diameter of the inlet channel leads to the fact that most of the liquid (gas) to be filtered, the internal filter element passes through the radial hole will enter the cavity of the external filter element with a slight clogging of the internal filter element.

The size of the diametral opening, equal to 0.36-0.52 of the diameter of the inlet channel and constituting 0.1-0.2 of the living surface area of the internal filter element, is optimal and allows 80-90% of the total surface area to be used for contamination; of the internal filter element at a given total pressure drop across the radial hole and the internal filter element.

The operation of the filter is as follows.

Fluid through the inlet channel, made in the form of an expanding nozzle, enters the cavity of the internal filter element and foreign particles held in the center of the flow core by inertia rush to the opposite end of the filter element and are retained there. A portion of the liquid thus purified is cleaned a second time by an external filter element and reaches the consumer through the outlet channel. At the same time, a smaller part of the fluid, which is located outside the center of the flow core with less pollution, mines the internal filter element, through the radial opening 6 of the sleeve 4 enters the cavity of the filter element 3, is cleaned and then also goes to the consumer.

At the beginning of the filter operation, due to the low resistance, most of the liquid passes through the internal filter element and the external one. As the surface of the internal filter element is contaminated on it, the pressure drop increases and the flow through the radial opening 6 begins to grow. When 80-90% of the surface of the internal filter element is clogged, the flow through the radial hole

will become equal to the flow through the internal filter element and from this moment on the input filter and the radial opening along with the flow of the filtered liquid (gas) begin to enter the mechanical impurities and contaminate it. At the same time, the accumulated contaminant on the inner filter element is retained on its walls due to the inlet pressure.

The use of the invention will increase the service life of the filter.

Claims (2)

1. Bashta, TM Mashinostroitelnaya hydraulics, “Mechanical Engineering, 1971, p. 546. 2. Bashta TM Mechanical engineering hydraulics. “Engineering, 1971, p. 544, rice 321.