Field of the invention

The invention relates to the field of hydraulic engineering, namely, to filters that can be used as a water intake device of main pumps. The main purpose of this filter is to protect the suction line and surface pump from large mechanical impurities.

Prior art

A filter is known comprising a housing, inlet and outlet connections, a filter element mounted with the possibility of longitudinal movement, cowls made in the form of a cone and attached to the rod on opposite sides of the inlet and outlet connections, moreover the filter element together with the cowls perform the function of a flow switch and check valves (SU 1699523).

A downhole filter is known comprising a perforated pipe with a nipple and sleeve parts, concentrically to which a filter element is mounted made of rings, the ends of which are in contact, and at one or both ends of the rings a knurling is made, characterized in that the knurling is made crosswise or tangentially to increase the filter capacity (RU 2364709).

A downhole filter, comprising a filter shell with a base element in the form of a pipe, longitudinal elements in the form of rods and support rings, characterized in that the support rings are made with external grooves for the longitudinal elements and internal grooves forming longitudinal channels with the base element, while the longitudinal elements are made of rods in the form of rectangular triangles, the sides of which containing the right angle of a triangle form the outer diameter of the filter shell, and the sharp angles are installed in the longitudinal channels with the formation of one-sided extensions and providing directed flows of the filtered agent (RU 2284408).

A mine filter is known comprising a housing containing a cylindrical part with a tangential connection pipe for water input and a cover with a connection pipe for draining purified water and a conical part with a valve for washing the filter located at the top of the conical part, equipped with a filter element congruent in shape to the housing with an internal cavity mounted coaxially inside the housing with the formation of an annular gap, decreasing to the top of the conical part of the housing, and the connection pipe for draining purified water is connected to the internal cavity of the filter element (RU 37386).

A downhole filter is known comprising a support frame and a filter shell concentrically mounted on it, comprising at least one layer of a support-drainage mesh, two layers of filter screens and an outer protective casing of a mesh similar to a support-drainage one, with that as a support frame for the filtering shell, a rod structure is used, formed by steel rods of circular cross section, one of which has a groove of a radial profile to the center of the rod, intended for fastening the mesh of the filter shell, the rods are installed and welded along contact contours to two supporting steel cylinders with nipple ends for the coupling and to supporting steel rings from a round bar with bends to recess the rods in them, and the filter screen meshes are sequentially wrapped over the rods to form an overlap of the ends of the meshes symmetrically to the rod with a radial groove, then the filter shell is welded to the support frame (RU 2433251).

A mesh filter is known comprising a sleeved mesh and a support frame in the form of a spring, the sleeved mesh is fixed at one end to a nozzle with a flange, and the other - on a sleeve of an inlet dismountable cone director with a wire through holes made on said nozzle and sleeve, mounted on a support frame made in the form of a spring, which ensures the installation of the filter in the channel with a bent axis of the inner cylindrical surfaces. The sleeved mesh is made of overlapping fabric and stitched with staples in increments comparable to the spring pitch. The inlet dismountable cone director is made of two parts and is provided with a threaded section between the cone director and the sleeve on which the sleeved mesh is prefixed (RU 2359738).

A downhole pump filter is known comprising a perforated pipe with a mesh and a check valve, characterized in that the check valve is made in the form of a spool located in the lower part of the perforated pipe with freedom of axial movement below the mesh and communicating the filter cavity with the well in its highest position (RU 35653, prototype).

A filter is known comprising a housing mechanically connected by threaded elements and a removable cover and a cylindrical filter mesh installed between the housing and the cover, the housing being made on the suction side in the form of a truncated perforated hollow cone, on the periphery of a larger base of which there is a non-circular groove for installing the end edge of the mesh, with an arcuate wall with straight grooves on the inside for installing the longitudinal edges of the mesh, and with racks having end fixing holes for the above-mentioned threaded elements, and the cover is made in the form of a passage fitting with an outlet for supplying liquid to the pump and flange suction, on the periphery of which a non-circular groove is made to install another end of the mesh, and with passage holes for the installing threaded elements in the holes of the rack posts.

The disadvantages of the known filters are the complexity of design of the interface between the filter housing and the check valve of the hydraulic system, low maintainability, and low reliability of the pump protection due to the high intrinsic sensitivity to contamination.

Summary of the Inventions

The technical problem being solved by this technical solution of the invention is the creation of an effective water intake filter and the expansion of water intake filters range.

The technical result that provides the problem solution lies in reducing the dimensions and weight of the hydraulic system, simplifying the joints design by eliminating intermediate pipelines, their interfaces and fasteners between the filter and the check valve, and increasing maintainability, simplifying installation technology in the hydraulic system, as well as increasing durability and reliability, due to the protected internal placement of the check valve and, therefore, the duration of its operation, as it does not allow stagnation of sediment between the integral filtering part and the admission (seat) of the check valve.

The essence of the invention is that the filter contains an interconnected housing and a cover, as well as a cylindrical filter mesh in the cylindrical part of the housing, which is made on the side opposite to the cover, in the form of a hollow truncated cone, and the cover is made in the form of an axially symmetric body on one side with a pass fitting for supplying fluid from the filter to the pump suction of the pipeline, and on the other side, with a flange, on the periphery of which the edges of the cylindrical part of the housing and mesh are mounted, and the cover is provided with a sleeve coaxial to its fitting, made with a threaded portion located in the cylindrical part of the housing, while the sleeve has a built-in check valve with a shutter, the seat of which is mounted on the indicated threaded portion of the sleeve with the possibility of liquid passing from the housing, and the rod is placed in the holes of guides installed with their outer bands in the sleeve between the threaded section of the latter and the cover fitting, with the possibility of axial movement of the rod with the shutter to interact with the seat when exposed to the flow from the cover pass fitting.

Preferably, an inner stop collar is provided in the cover at the edge of the sleeve to secure the check valve guides to the valve seat.

Preferably, the check valve shutter is made poppet-shaped, provided with an annular sealing plate and made from the side of interaction with the seat as a rounded protrusion in the center of the sealing plate.

Preferably, the filter mesh is formed by straight-line grooves of the housing cylindrical part wall and external concentric stiffeners made on it.

Preferably, the check valve rod guides are made in the form of two guide bushings sequentially installed in the cover sleeve, each of which has inclined partitions converging to the central ring in which the hole for the rod is made, and the outer band with a cylindrical surface for installation of the cover in the sleeve, while this sleeves are installed coaxially and facing each other with the bases of the inclined partitions connected to the inner surface of the outer band with the formation of windows for fluid passage.

Preferably, the central ring of each of the guide bushings is made with grooves around the hole for the rod.

Preferably, the housing in its cylindrical part is made with four annular stiffeners, and in the part of the truncated cone - with four radial inclined stiffeners.

Preferably, the cylindrical part of the housing is made with a threaded band mating with a thread made on the periphery of the cover flange.

Preferably, the housing and cover, as well as the seat, valve and check valve guides are made of plastic. Short description of drawings

In the drawing of Fig. 1, an external view of the water intake filter is shown, Fig. 2 presents a vertical section through the check valve channels for passing fluid, Fig. 3 is a vertical section through the partitions of the check valve guides, Fig. 4 shows a diagram of the filter connection to flexible suction pipe of surface pump or automatic pump station.

Detailed Description of the Invention

The filter comprises a threadedly connected housing 1 and a removable cover 2. The housing 1 consists of a cylindrical part and a hollow truncated cone 15, the periphery of the larger base of which passes into a cylindrical mesh formed by straight-line grooves (slots) 16 and concentric stiffeners 17. The wall of the hollow truncated cone 15 is perforated with rectangular through windows that are proportional to the through capacity of the cylindrical mesh holes.

The cover 2 is made monolithic in the form of an axially symmetric body integral with a pass fitting 11 with an outlet (bore) 12 for supplying liquid from the filter to the pipeline 18 to the pump suction, and on the other side - with a flange 19, from the inside of which the edges of the cylindrical part of the housing 1 are installed on the periphery.

The cover 2 is provided with a sleeve (boss) 13 made integral with it and coaxial with its fitting 1 1 , made with a threaded portion located in the cylindrical part of the housing 1. A built-in check valve with a shutter 6 is installed in the sleeve 13, the seat 3 of which with an elastic seal 10 is fixed in thread on the indicated threaded section of the sleeve 13 with the possibility of fluid passing directly from the internal volume of the housing 1.

The rod 5 is placed (based) in holes of the guides 4, installed with their outer bands in the sleeve 13 between the threaded section of the latter and the fitting 1 1 of the cover 2, with the possibility of axial movement of the rod 5 with the valve 6 for interaction of the latter with the seat 3 when exposed to the flow from the side of the pass fitting 1 1 of the cover 2.

In the cover 2, at the upper edge (according to the drawing) of the sleeve 13, an inner stop collar 21 is made for fixing (pressing) the guides 4 of the check valve rod 5 to the stop against the seat 3 of its shutter 6. The check valve shutter 6 is made poppet-shaped, provided with an annular sealing plate 14 and made from the side of interaction with the seat 3 with the rounded protrusion in the center above the sealing plate 14 made of flexible material.

The guides 4 of the rod 5 of the check valve are made in the form of two guide bushings 4 sequentially installed in the sleeve 13 of cover 2, each of which has inclined partitions 22 converging to the central ring 23, in which the hole for rod 5 is made, and the outer band with the cylindrical surface for installation in the sleeve 13 of cover 2, the guide bushings 4 are installed coaxially and facing each other with the bases 24 of the inclined partitions 22 connected to the inner surface of the outer band with the formation of channels for fluid passage between the said partitions 22.

The guide bushings 4 in particular cases of implementation can be made with alternating triangular male ends (not shown) and, when installed, are facing each other with triangular male/female ends made on their bases, while the male ends of one sleeve are inserted into the female ends of the other sleeve.

The central ring 23 of each of the bushings of the guides 4 is made with grooves (not shown) around the hole for the rod 5.

The housing 1 in its cylindrical part is made with four annular stiffeners 17, and in the part of the truncated cone 15 - with four radial inclined stiffeners 25.

The cylindrical part of the housing 1 is made with an external threaded band mating with a thread made on the inner periphery of the flange of the cover 2.

The housing 1 and the cover 2, as well as the seat 3, the valve 6 with the rod 5 and the guides 4 of the check valve are made of plastic.

The water intake filter is operated as follows.

The filter is installed under the water surface and is held on the pipeline 18.

When the pump is running, the liquid is sucked through the slots 16 of the perforation of the cylindrical part of the housing 1 and by rectangular through windows of perforation of the hollow truncated cone 15.

The conical shape (cone 15) of the lower part of the housing 1 allows maximum use of the suction area. This allows the pump to fully pump water, even with partial clogging of the perforation of the housing 1, without losing its characteristics and not subjecting the pump motor to overloads. In case of clogging, the filter is washed, for which the cover 2 is screwed from the housing 1 and the sediment is removed from the latter.

Since the filter housing 1 and the cover 2 are mounted separately to each other, this allows one to disassemble the filter and clean it (or replace it), this, in turn, dramatically increases the service life and maintainability of the equipment.

The design of built-in valve allows mounting it together with the water intake filter directly on the pipeline 18 in one operation. When fluid enters through the filter from the well into the inlet seat 3, the shutter 6 with the rod 5 are raised above the seat 3 and the medium through the windows formed between the partitions 22 and having minimal hydraulic resistance enters the pipe 18 and then with minimal losses to the pump suction. In the absence of flow, the valve closes under the action of a liquid column above the valve in the suction pipeline 18 of the pump, acting on the rod 5 and pressing its shutter 6 with a sealing plate 14 to the seat 3. The guides 4 form with their holes two sliding bearings for moving the rod 5, so that the latter has the possibility of a reliable axial displacement (without skewing) for lifting the shutter 6 from the seat 3 while passing the flow and returning the shutter 6 with the elastic sealing plate 14 to the state pressed against the seat 3 in the absence of water consumption.

The design ensures the simultaneous installation of a filter with a check valve in the hydraulic line, which is aimed at increasing maintainability, and reducing the qualification requirements for installation of the device, since an erroneous installation sequence is eliminated - installing a check valve in front of the filter. The hydraulic resistance of the hydraulic system with the inventive filter (with built-in check valve) is minimal, because there are no intermediate pipelines, the transmitted flow does not overcome the compression force of the spring. The design allows one to combine the water intake filter and check valve in one device and to ensure compatibility of its design with flexible pipeline 18.

Installation, assembly or repair of the filter with the built-in check valve is carried out with a minimum number of connecting operations and connecting fittings, no spring installation is required, which reduces the possibility of assembly errors and valve breakage. The filter weight with built-in check valve is minimal. Another advantage of this design is the absence of metal parts and springs, low cost. These properties make the inventive filter implemented with a check valve integrated in the flow part of its housing, ideally functionally adapted, reliable, durable and maintainable with minimal design complexity.

Industrial application

The present invention is implemented with multipurpose equipment extensively employed by the industry.