UA20425U - Device for filtration - Google Patents

Abstract

A device for filtration contains a housing, connecting flanges, lattices, filtering elements, heating elements and closing screws. It additionally contains, at least, one adjusting screw with neck, on which a distributive, double-sided, self-placed, three-position, with possibility of free displacement within the limits of neck, valve is located, at least, two channels of the transport of filtered material to the lattices with filtering elements, at least, two self-placed opposite valves with a spaser spring and their housing.

Description

Description of the invention

The device for filtration refers to the technological equipment for the production of products from polymer 2 materials, and their secondary processing by the extrusion method and the casting method. It can also be used (with appropriate filter elements) for filtering gaseous, liquid, viscous and paste-like materials, where there is a production necessity of filtering under pressure, without interruption and maintaining the stability of the technological process when replacing the filter element and avoiding hydraulic shock when changing operating modes device. 70 The design of the device for filtering the melt of polymer materials is known (ZO 1288091 A1, 07.02.1987| and replacement of spent filter sieves with the drive of a movable block manually, pneumatically or hydraulically.

The disadvantage of this design is the interruption of the technological process when changing the filter sieves (stopping the machines).

The design of the device for filtering the melt of polymeric materials is also known.

The device includes a housing, a movable block with replaceable filter screens, a system for moving said block with a polymer melt under extrusion pressure, and transitional flanges for attaching the housing to the extruder and a forming head on the housing, and the block movement system with replaceable filter screens includes installed from two on the sides of the body, cylinders with pistons connected to the channels of the forming head of the transition flange using channels with shut-off valves. The cylinders have shutters, and the housing has removable plugs for access to the filter elements.

This device, as the closest in terms of its functional purpose and the technical result achieved, was accepted by me as a prototype.

Disadvantages of the known prototype device are: - large dimensions; sho - large material capacity; - the need for high-precision mechanical processing of mobile nodes in the places of sealing with fixed parts to prevent leakage of melt under high pressure; - high energy consumption - the need to install a large number of heating elements; o - difficult access during maintenance (restriction of space by the heated extruder and device housing and SI when replacing filter elements); - impossibility of filtering the melt through both filtering elements at the same time; C - the presence of four regulating devices (2 taps and 2 gate valves). The basis of the useful model is the task of creating such a design of the device for filtering polymeric materials, which would allow to increase the technological perfection of the filtering process, namely: сч - to reduce the overall dimensions of the device; - its material capacity; - to reduce the cost of electricity for heating the case due to the compactness of the device (in the experimental "model, two heating elements - on the top and bottom of the case); 50 - to ensure free access to the replacement of filter elements; With c - to ensure the possibility of replacing both filter elements on one side of the technological line;

And" - to avoid high-precision mechanical processing of device parts, by excluding mobile nodes, where it is possible for the melt to leak out through the seal; - to simplify the management of device operating modes by reducing the number of regulating devices.

This task is solved as follows: in a device for filtering, which contains a body, connecting flanges, grates, filter elements, heating elements and threaded plugs, of a useful model, it av! additionally contains: at least one set screw with a neck on which there is a distribution, two-way, self-setting, three-position, with the possibility of free movement within the neck of the valve, at least two channels for transporting the filtered material to the grids with filter elements; ka 20 at least, two self-installing opposite with expansion spring valves and their housing.

Comparative analysis shows that the common structural elements of the proposed device and the similar device for filtering polymeric materials (Russian patent Mo22130071I) are: - body; - connecting flanges; 52 - grids; c - filtering elements; - heating elements; - threaded plugs.

Distinctive nodes in the proposed device are: 60 - a set screw with a neck on which a distribution, two-way, self-centering, three-position, with the possibility of free movement within the neck, valve is located; - at least two channels for transporting molten polymer material to grids with filter elements; - at least two self-installing, opposite valves with a spacer spring and their body. because the cause-and-effect relationship between the essential features of the proposed solution, which are sufficient in all cases, and the obtained final technical results provide new technical qualities, allowing, in combination with known features, to obtain the technical results specified in the problem statement.

According to the information available to the applicant, the proposed set of features characterizing the essence of the utility model is unknown from the state of the art, i.e., the utility model meets the criterion of "novelty".

The device is explained by the drawings, which show: - Fig. 1 - general view of the device in section; - Fig. 2 - a view of the set screw with a neck on which there is a distribution, two-sided, self-centering, three-position, with the possibility of free movement within the neck, valve, with an open 7/0 bypass channel; - Fig. 3 - a view of the arrangement of self-setting, opposite valves with a spacer spring in the middle position; - fig. 4 - a view of the location of self-installing, opposite valves with a spacer spring without fuel pressure.

The proposed device consists of housing 1; connecting flanges 2, 3; set screw 4. with a neck on which there is a distribution, two-way, self-centering, three-position, with the possibility of free movement within the neck, valve 5; distribution channels 6, 7; threaded plugs 8, 9; pressure relief valves 10, 11, having a threaded connection with threaded plugs; grid with filter elements 12,13; self-installing, opposite valves with expansion spring 14; their body 16, with a collective collector 17 and an outlet channel 18, connected to a collective collector; extruder 19; profile head 20.

The dotted line indicates the direction of melt movement.

The device works as follows: the melt, which is supplied under pressure from the extruder (thermoplastic machine), with the help of the set screw 4 with the valve 5, is directed to the channel 6. Then the melt enters the filter element, which is located on the grid 12, while the threaded plug 8 closes output of the melt from the case. After filtering through the filter element, the melt under pressure opens the valve 14, compressing the expansion spring, and enters the ring collector 17, and then enters the outlet channel 18. However, the melt is not fed to the grid 13, because on the supply side of the melt from access to the extruder is closed to it by valve 5, and on the side of the collector - valve 14, closed under the pressure of the melt from the grid 12. If before this, filtration was carried out through the grid 13, then in order to replace the filter element on it, without stopping the technological process, it is necessary equalize the pressure of the melt in channel 7 to atmospheric, using the pressure relief valve 11, by turning the latter 1-2 revolutions, which makes it possible to unscrew the threaded plug 9 and replace the filter element. "Mr

After installing the threaded plug 9 and the pressure relief valve 11, it is necessary to gradually fill the cavity in front of the grid 13 (with the filter element replaced) with melt, in order to avoid pulsation of the melt and hydraulic shock (when filtering high-flowing material) in the outlet channel when switching . For this, the setting screw 4 opens the bypass channel between the neck of the setting screw 4 and the valve 5 (Fig. 2), by rotating the setting screw 4 (which has a threaded connection with the body) by 1/3-1/4 of a turn, while , valve 5 remains in the same position under melt pressure. The volume of melt needed to fill the above-mentioned cavity is less than 195% of the total volume of productivity and practically does not affect the stability of the technological process. To replace the filter element on the grid 12, it is necessary to move the valve 5 in the opposite direction to the stop by turning the set screw 4. When moving the valve 5, the melt is filtered through both filter elements, since both channels 6 and 7 are open and the valve 14 is gradually moved under the pressure of the melt until the access of the melt to the grid 12 is completely closed (after the valve 5 completely closes channel 6). At the same time, there is no pulsation of the melt and the stability of the technological process is maintained, as

The GI cavity in front of the grid 13 was filled with melt gradually with the help of a bypass channel.

The actions required to replace the filter element on the grid 12 are similar to the above-described actions for replacing the filter element on the grid 13. It is also possible to filter the melt through both grids with filter elements 12 and 13 at the same time, which gives a doubling of the filtration area by installing valve 5, with the help of the set screw o 4, in the middle position - to pass the melt into the channels 6 and 7 simultaneously, while the valve 14 will also take the middle position under the pressure of the melt from both sides (Fig. 3). After contamination of one of the filter elements with mechanical inclusions from the melt, the valve 14 will gradually move towards this sieve until it is completely closed, thanks to the increase in the pressure of the melt from the "cleaner" sieve.

Fig. 4 shows the position of valve 14 in the absence of melt pressure.

Advantages of the proposed device: c - small dimensions; - small material capacity; - does not require high-precision mechanical processing of parts due to the absence of movable nodes, where it is possible for the melt to leak out through the seal; - small consumption of electricity for heating the case due to the compactness of the device (in the experimental model there are two heating elements - on the top and bottom of the case); - free access to replacement of filter elements; - the possibility of replacing both filter elements on one side of the technological line, when the axis 65 of the locking nuts of the device is located at an angle of 45 degrees. to the horizontal line; - the possibility of filtering the melt through both filtering elements at the same time;

- simplification of device management - all operating modes are regulated by one setting screw and two pressure relief valves.

Thus, the utility model offered for protection has structural and operational advantages over the known prototype design and, according to the applicant, can be protected by a patent of Ukraine.

Claims (1)

Formulation of the invention 70 A device for filtering containing a body, connecting flanges, grates, filter elements, heating elements and threaded plugs, which is characterized by the fact that it additionally contains at least one set screw with a neck on which is located a distribution, two-way, self-installing, three-position, with the possibility of free movement within the neck, valve, at least two channels for transporting the filtered material to the grids with filter elements, at least two /5 self-installing opposite valves with expansion spring and their housing. with in and in) se "I (av) s no) 1" ko (av) t" ko sl bo b5