CN112943749A

CN112943749A - Duplex stacked filter

Info

Publication number: CN112943749A
Application number: CN202110140449.8A
Authority: CN
Inventors: 何荣志
Original assignee: Individual
Current assignee: Shanghai Acc Hydraulic Technology Co ltd
Priority date: 2021-02-02
Filing date: 2021-02-02
Publication date: 2021-06-11
Anticipated expiration: 2041-02-02
Also published as: CN112943749B

Abstract

A pair stack formula filter which characterized in that: the duplex filter comprises a valve block, two groups of filter elements and two valve sleeves; the filter is installed on the hydraulic valve table in a mode of overlapping and connecting the valve blocks and is positioned at the bottommost layer of the hydraulic control valve, at least 4 standard control oil paths of P, T, A, B hydraulic logic valves are arranged in the valve blocks, the filter elements are detachably arranged in the valve blocks and are positioned on the A, B control oil paths, and valve sleeves used for positioning and fixing the filter elements are detachably installed on two sides of the valve blocks. The invention has simple and reasonable structure, small volume and convenient installation and maintenance, effectively avoids the hydraulic valve from being prevented from faults caused by the blockage of solid foreign matters generated in the hydraulic actuating element and the pipeline thereof, fills the blank that the conventional A, B oil way is difficult to purify, and simultaneously, the filter element can be conveniently disassembled and is convenient to clean and maintain.

Description

Duplex stacked filter

Technical Field

The invention belongs to the technical field of hydraulic systems, relates to a hydraulic filter, and particularly relates to a duplex stacked filter.

Background

In modern industry, a large number of hydraulic systems are applied to production lines of various machines, the reliability of the hydraulic systems is extremely important, and the clamping valve faults generated by the hydraulic systems every year bring huge economic losses to production.

In the existing hydraulic system, although a relatively perfect filtering system is applied, a high-pressure P pipe filter is arranged at an outlet (or a valve table) of the pump, and an oil return filter and a circulating filter are also arranged on an oil tank, so that a control valve of the hydraulic system is well protected; however, in practical use, the phenomena of frequent valve clamping of the directional valve, the flow valve and the pressure control valve still occur frequently, and great production economic loss is caused every year. The reason for this is that the existing three filters cannot effectively purify the internal pollutants generated by the hydraulic pipeline, the oil cylinder and the hydraulic motor in front of the liquid valve table, so the filtering protection mechanism of the existing hydraulic system is not complete.

Therefore, there is a need to develop a new hydraulic filter for protecting the hydraulic valve from the malfunction caused by the jamming of the hydraulic actuator and the solid foreign matter generated in the pipe thereof, so as to ensure the normal operation of the hydraulic system.

Disclosure of Invention

The invention aims to provide a double-stack type general filter which is simple and reasonable in structure, small in size and convenient to maintain, can effectively purify foreign matters generated in a hydraulic actuating element and a hydraulic pipeline and is suitable for all stack type hydraulic circuits.

The technical scheme adopted by the invention for solving the technical problems is as follows: a pair stack formula filter which characterized in that: the duplex filter comprises a valve block, two groups of filter elements and two valve sleeves; the filter is installed on the hydraulic valve table in a mode of overlapping and connecting the valve blocks and is positioned at the bottommost layer of the hydraulic control valve, at least 4 standard control oil paths of P, T, A, B hydraulic logic valves are arranged in the valve blocks, the filter elements are detachably arranged in the valve blocks and are positioned on the A, B control oil paths, and valve sleeves used for positioning and fixing the filter elements are detachably installed on two sides of the valve blocks.

The filter used as a connection form of the stacked valve block comprises at least 4P, T, A, B four-way logic control oil paths, wherein each path comprises 1 pair of oil ports, namely 8 oil ports consisting of 4 pairs of upper and lower surfaces, the upper and lower oil ports are respectively superposed in the projection of the horizontal plane, and all the oil ports and connecting bolt holes meet the stacking standard requirement of a hydraulic logic control element, namely, the positions, the sizes, the connecting bolt holes and other geometric dimensions of the oil ports meet the national standard (and international standard) installation requirement, in the P, T, A, B four-way logic control oil path, the upper and lower oil ports of a high-pressure P, T oil path are directly communicated, and in the A, B internal oil path, the upper and lower oil ports are communicated after being filtered and purified by a filter element; and the oil ports on the lower surface of the filter valve block connected with the valve stand are respectively provided with a counter bore and a sealing piece for preventing leakage, the logic oil port on the upper surface of the filter is respectively and correspondingly communicated with the oil port of the hydraulic control valve P, T, A, B which is directly connected, and the sealing of the hydraulic control valve P, T, A, B is realized by the sealing piece of the control valve.

Furthermore, A, B control oil paths in the valve block are arranged in bilateral symmetry, the cross section of the filter element is perpendicular to a connecting line between projection centers of A, B oil ports on a horizontal plane, a horizontal first flow passage and a horizontal second flow passage are respectively arranged on the left side and the right side of the upper part in the valve block, a horizontal third flow passage and a horizontal fourth flow passage are respectively arranged on the left side and the right side of the lower part in the valve block, filter elements are respectively arranged between the first flow passage and the third flow passage and between the second flow passage and the fourth flow passage, openings on the first flow passage and the second flow passage are respectively and directly communicated with A, B oil ports of the hydraulic control valve, the inner opening is arranged on one side of the filter element, lower openings of the third flow passage and the fourth flow passage are respectively and directly communicated with a A, B oil port of the hydraulic control valve platform (namely a A, B cavity of the actuating element), the inner opening is arranged on the other side of the filter element, in the projection direction of the horizontal plane, the center connecting line of the A, B oil port is perpendicular to and intersected with the center connecting line of the bolt hole at each of the left end or the right end of the valve block, the filter element is positioned outside the intersection point for a certain distance, generally more than 3 mm is required, in the position, the oil port opening can be expanded as much as possible to accommodate the installation of the filter element with a large section, one end of the filter element is contacted with the valve block, and the other end of the filter element is contacted with the valve sleeve to form a fixed.

Furthermore, the filter element adopts a 'round surface' plate type filter element or a cylindrical 'barrel-shaped' type filter element, the radius R of the cross section circle of the filter element is larger than or equal to 10mm, and the drift diameter of the cross section circle of the filter element is more than 3 times of the drift diameter of the protected control valve.

And furthermore, the filter element is formed by assembling two or more identical circular panel type filter elements in parallel, the circular panel type filter elements are fixed in a cylindrical filter element framework at equal intervals, and oil flow passage openings are formed in the filter element framework and are respectively communicated with the flow passage openings on the upper surface and the lower surface of the A, B oil passage of the valve block, so that a filter element group is formed.

Typically, filter cartridges are preferably of the "bowl" type or groups of parallel filter elements to maximize cartridge area in a limited space. When the cylindrical filter element is adopted, the space of the inner surface and the outer surface of the filter element can be regarded as a part of the internal oil passage,

further, in certain instances, the valve housing and filter element may be integrated into a unitary structure.

Furthermore, the filter valve sleeve is a shell sleeve type component with a certain internal space, the appearance of the filter valve sleeve is a rotary geometric body, the filter valve sleeve has the function of fixing the filter element and is connected with the valve block to form a sealing space relative to the outside, and a certain oil liquid flow channel relation can be relatively formed among the valve block, the filter element and the valve sleeve.

The connection between the valve block and the valve sleeve can adopt a thread or flange connection mode, the left end and the right end of the valve block are respectively provided with an internal thread (an external thread), and the corresponding valve sleeve is provided with a corresponding external thread (an internal thread); or the left side and the right side of the valve block are provided with a plurality of mounting holes around the circular opening, and the valve sleeve is connected with the valve block in a flange bolt mode; an end face sealing element is arranged between the valve sleeve and the valve block to prevent external leakage; generally, it is simpler and more reliable to prefer a threaded connection.

The filter can be independently applied to various hydraulic circuits, and can also be applied together with other filters (such as a high-pressure filter), and in practical application, the combined application effect is better.

Compared with the prior art, the invention has the advantages that: the filter adopts a superposition type standard valve block installation mode, and an A, B oil way filter is integrated in the valve block at the same time, so that hydraulic oil from a rodless cavity and a rod cavity of a hydraulic execution element can be comprehensively purified, impurities of the hydraulic oil are prevented from entering the interior of the hydraulic control valve, and the hydraulic control valve is thoroughly protected from being polluted by the hydraulic oil. The invention has simple and reasonable structure, small volume and convenient installation and maintenance, effectively avoids the hydraulic valve from being prevented from faults caused by the blockage of solid foreign matters generated in the hydraulic actuating element and the pipeline thereof, fills the blank that the conventional A, B oil way cannot be purified and filtered, and simultaneously, the filter element can be conveniently disassembled and is convenient to clean and maintain.

Drawings

FIG. 1 is a hydraulic schematic of an embodiment of the present invention;

FIG. 2 is a front view of an embodiment of the present invention;

FIG. 3 is a top view of an embodiment of the present invention;

FIG. 4 is a schematic view of a panel-style filter element;

FIG. 5 is a schematic view of a cartridge-type filter element;

fig. 6 is a schematic structural diagram of three plate-type filter elements connected in parallel.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

The application principle of the present invention is illustrated by taking the oil cylinder 20 controlled by the most common proportional directional valve 30 as an example and taking the combination of the present invention and a traditional high-pressure filter in a hydraulic circuit as an example.

In the description of the filter structure of the invention, the filter structure corresponding to the 6-path logic control valve is taken as an example to illustrate the internal structure principle, and the 10-path and 16-path logic control valves have similar internal structures, so that the application of the valves is not difficult to popularize.

As shown in fig. 1 to 6, a duplex stack type filter comprises a valve block 1, two groups of filter elements 2 and 3 and two valve sleeves 4 and 5; the filter is installed on a hydraulic valve table in a mode that a valve block 1 is overlapped and connected and is positioned at the bottommost layer of a hydraulic control valve, at least 4 standard control oil ways of P, T, A, B hydraulic logic valves are arranged in the valve block 1 (an X leakage oil way is additionally arranged for logic valves with the diameter of 16 drift and above), and filter cores 2 and 3 are respectively arranged in two logic oil ways A, B in the filter valve block 1; the valve sleeves 4 and 5 are arranged on two sides of the valve block 1 and are used for positioning and fixing the filter elements 2 and 3, the valve sleeves and the valve block 1 form a relative sealing space together, the valve sleeves and the valve block 4 and 5, the valve block 1 and the filter elements 2 and 3 form a complete unified organism together, and the detachable element is also convenient for replacing the filter elements 2 and 3.

Internal and external connection: the invention is used as a filter in a connection mode of a superposed valve block, at least 4P, T, A, B four-way logic control oil paths are arranged in the filter, each path is provided with 1 pair of oil ports, namely, the upper and lower surfaces each have 4 pairs of 8

oil ports

101 and 103, 102 and 104, 11 and 13, 12 and 14, the upper and

lower oil ports

101 and 103, 102 and 104, 11 and 13, 12 and 14 are respectively superposed in projection in the horizontal plane, and all the

oil ports

101 and 103, 102 and 104, 11 and 13, 12 and 14 and the connecting bolt holes 100 meet the requirement of the superposition standard of a hydraulic logic control element, namely, the oil port position, the size, the connecting bolt hole and other geometric dimensions all meet the installation requirements of national standard (and international standard), in the P, T, A, B four-way logic control oil way, the upper oil port 101, the lower oil port 103, the upper oil port 102 and the lower oil port 104 of a high-pressure P, T oil way are directly communicated, in an oil path inside A, B, upper and

lower oil ports

11 and 13, and 12 and 14 are communicated after being filtered and purified by filter elements 2 and 3; the

oil ports

103, 104, 13 and 14 on the lower surface of the filter valve block 1 connected with the valve stand are respectively provided with counter bores and provided with sealing pieces to prevent leakage, the

logic oil ports

101, 102, 11 and 12 on the upper surface of the filter and the oil port of the directly connected hydraulic control valve P, T, A, B are respectively and correspondingly communicated, and the sealing of the hydraulic control valve and the hydraulic control valve is realized by the sealing pieces of the control valve.

Internal oil ducts: a, B control oil passages in the valve block 1 are arranged in bilateral symmetry, the cross sections of the filter elements 2 and 3 are perpendicular to a connecting line between projection centers of A, B oil ports on a horizontal plane, a horizontal first flow passage 16 and a horizontal second flow passage 17 are respectively arranged on the left side and the right side of the upper portion in the valve block 1 in the vertical plane, a horizontal third flow passage 26 and a horizontal fourth flow passage 27 are respectively arranged on the left side and the right side of the lower portion in the valve block 1, the filter elements 2 and 3 are respectively arranged between the first flow passage 16 and the third flow passage 26 and between the second flow passage 17 and the fourth flow passage 27, upper openings of the first flow passage 16 and the second flow passage 17 are respectively communicated with

upper openings

11 and 12 of a A, B oil passage of a hydraulic control valve, inner openings of the first flow passage 16 and the second flow passage 17 are arranged on one side of the filter elements 2 and 3, and lower openings of the third flow passage 26 and the fourth flow passage 27 are respectively communicated with lower openings 13, Cavity B), the internal opening is located on the other side of the filter elements 2 and 3, and each oil channel shape of the A, B cavity is "L" type, and is configured according to different angles, in the projection direction of the horizontal plane, the central connecting line of the

oil ports

11 and 13, 12 and 14 of the A, B oil channel is perpendicular to and intersects with the central connecting line of the bolt holes at the left side or the right side of the valve block 1, and the filter elements 2 and 3 are located outside the intersection point for a certain distance, generally more than 3 mm is required, in this position, the oil channel opening can be enlarged as much as possible to accommodate the installation of the filter element with a large section, one end of the filter elements 2 and 3 contacts with the valve block 1, and the other end contacts with the valve sleeves 4 and 5.

The filter element structure: the filter elements 2 and 3 adopt a 'round surface' plate type filter element 2a or a cylindrical 'barrel-shaped' filter element 3a, the radius R of the cross section of the filter elements 2 and 3 is not less than 10mm, and the drift diameter of the cross section of the filter elements 2 and 3 is more than 3 times of that of the protected control valve; the filter elements 2 and 3 are usually assembled by connecting two or more identical round panel type filter elements 2a in parallel, the filter elements 2 and 3 of the embodiment are fixed in a cylindrical filter element framework 200 by three round panel type filter elements 2a at equal intervals, the filter element framework 200 is provided with

oil flow passages

21, 22, 23 and 24 which are respectively communicated with the

flow passages

11, 12, 13 and 14 on the upper and lower surfaces of the A, B oil passage of the valve block, so as to form a filter element group.

Typically, the filter cartridges 2 and 3 are preferably of the "bowl" type or a parallel bank of filter cartridges to maximize cartridge area in a limited space. When the cylindrical filter element is adopted, the inner and outer surface spaces of the filter elements 2 and 3 can be regarded as a part of the inner oil passage,

further, in certain instances, the valve housings 4 and 5 and the filter cartridges 2 and 3 may be integrated into a unitary structure.

Valve barrel structure and function:

the valve sleeves 4 and 5 are shell type parts with certain inner spaces 42 and 52, the appearance of the valve sleeves is a rotary geometric body, the valve sleeves 2 and 3 are fixed and connected with the valve block 1 to form a sealing space relative to the outside, and certain oil liquid flow channel relation can be relatively formed among the valve block 1, the filter elements 2 and 3 and the valve sleeves 4 and 5.

The valve block 1 and the valve sleeves 4 and 5 are connected in a threaded or flange connection mode, the left end and the right end of the valve block 1 are respectively provided with inner (outer) threads, and the corresponding valve sleeves 4 and 5 are provided with corresponding outer (inner) threads; or the left side and the right side of the valve block 1 are provided with a plurality of mounting holes around the circular opening, and the valve sleeves 4 and 5 are connected with the valve block 1 in a flange bolt mode; an end face sealing piece 7 is arranged between the valve sleeves 4 and 5 and the valve block 1 to prevent external leakage; generally, it is simpler and more reliable to prefer a threaded connection.

The specific operation process is as follows:

when the pressure source main pipe P supplies oil to the proportional directional valve 30, hydraulic oil is filtered by the high-pressure filter 6 and then flows through the duplex filter 10 to the oil port 303 of the proportional directional valve 30, the high-pressure filter 6 protects the proportional directional valve 30 from being polluted by the pressure source, and then flows into the rodless cavity of the oil cylinder 20 through the oil port 301, the oil port 11, the filter element 2 and the oil port 13 after being regulated and controlled by the proportional directional valve 30, meanwhile, oil in the rod cavity of the oil cylinder 20 flows through the oil return main pipe T to return the oil tank through the oil port 14, the filter element 3, the oil port 12, the oil port 302, the oil port 304, the oil port 102 and the oil port 104, the filter element 3 purifies the hydraulic oil from the rod cavity of the oil cylinder 20 to the oil port 14, so as to ensure that the oil flowing to the proportional valve 30 is not polluted by any oil, and at the time, the high-pressure filter 6 and the; similarly, when the load circuit is in demand, the proportional directional valve 30 is reversed, then, after being filtered by the high-pressure filter 6, the oil flowing through the proportional directional valve 30 flows to the rod cavity of the oil cylinder 20, meanwhile, the oil without the rod cavity flows back to the oil tank through the oil return header pipe T via the oil port 13, the filter element 2, the oil port 11, the oil port 301, the oil port 304, the oil port 102 and the oil port 104, the filter element 2 purifies the hydraulic oil from the rod-free cavity of the oil cylinder 20 and the oil port 13 to ensure that the oil flowing to the proportional valve 30 is not polluted, and at the moment, the high-pressure filter 6 and the filter element 2 simultaneously protect the proportional directional valve 30 from the pollution of the oil in any direction inside. Therefore, no matter how the oil cylinder 20 moves, the high-pressure filter 6 and the filter element 2 or 3 can protect the proportional directional valve 30 from pollution sources in all directions, and each filter element can always block the pollution sources out of each oil port of the proportional directional valve 30.

When the filter is used for a long time and the filter elements 2 and 3 need to be replaced or cleaned, the filter elements 2 and 3 can be replaced by directly disassembling the valve sleeves 4 and 5, the valve sleeves 4 and 5 can be completely disassembled and then the valve sleeves 2 and 3 can be assembled back, back washing is carried out, solid pollutants accumulated in a pipeline are back washed into the main oil return filter of the hydraulic station, then the filter elements 2 and 3 are installed and recovered, and the filter can work again.

The hydraulic control valve of the present embodiment is the proportional directional valve 30, but is not limited to the proportional directional valve 30, and can be applied to all hydraulic control circuits, and can normally protect various hydraulic control valves from being contaminated by oil, and the present embodiment takes the hydraulic cylinder 20 as an example, and is also applied to hydraulic circuits using hydraulic motors and other actuators.

A large number of practical applications prove that certain solid pollutants are always generated in a hydraulic system which is normally used for a long time, including a pump, a hydraulic hard pipe, a hose, an oil cylinder and an oil motor, and the total amount of the solid pollutants is not too much, so that the filter is convenient to design into a small and exquisite shape except a large-capacity circulating filter, an oil return filter and a part of high-pressure filters which are commonly used in a hydraulic station, is used as a beneficial supplement for the traditional filter, and is particularly suitable for processing the small-probability event of the valve clamping.

After implementation and use, the invention is conveniently superposed on the first layer of the hydraulic control valve table, the appearance of the invention is similar to that of the hydraulic control valve, and the use proves that the phenomenon of valve clamping due to oil contamination is not generated, the reliability of hydraulic equipment is greatly improved, and good economic benefit is obtained.

The above description is only one of the preferred embodiments of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made according to the filter processing technology and the actual application situation in the field without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A pair stack formula filter which characterized in that: the duplex filter comprises a valve block, two groups of filter elements and two valve sleeves; the filter is installed on the hydraulic valve table in a mode of overlapping and connecting the valve blocks and is positioned at the bottommost layer of the hydraulic control valve, at least 4 standard control oil paths of P, T, A, B hydraulic logic valves are arranged in the valve blocks, the filter elements are detachably arranged in the valve blocks and are positioned on the A, B control oil paths, and valve sleeves used for positioning and fixing the filter elements are detachably installed on two sides of the valve blocks.

2. The duplex stacking filter of claim 1, wherein: in P, T, A, B four logic control oil paths in the valve block, each oil path is provided with 1 pair of oil ports, namely 8 oil ports are arranged on the upper surface and the lower surface respectively, the projections of the upper oil port and the lower oil port are overlapped respectively in the horizontal plane, all the oil ports and connecting bolt holes meet the requirement of the superposition standard of a hydraulic logic control element, namely, the positions, the sizes, the connecting bolt holes and other geometric dimensions of the oil ports meet the installation requirement of the national standard or the international standard, in the P, T, A, B four-way logic control oil path, the upper oil port and the lower oil port of a high-pressure P, T oil path are directly communicated, in the A, B internal oil path, the upper oil port and the lower oil port are communicated after being filtered and purified by a filter element, and the logic oil ports on the upper.

3. The dual stack filter of claim 2, wherein: the A, B control oil passages in the valve block are arranged in a bilateral symmetry mode, the cross section of the filter element is perpendicular to a connecting line between projection centers of A, B oil ports on a horizontal plane, in a vertical plane, the left side and the right side of the upper portion in the valve block are respectively provided with a horizontal first flow passage and a horizontal second flow passage, the left side and the right side of the lower portion in the valve block are respectively provided with a horizontal third flow passage and a horizontal fourth flow passage, the filter element is respectively arranged between the first flow passage and the third flow passage and between the second flow passage and the fourth flow passage, upper openings of the first flow passage and the third flow passage are respectively and directly communicated with A, B oil ports of the hydraulic control valve, the inner openings are arranged on one side of the filter element, lower openings of the third flow passage and the fourth flow passage are respectively and directly communicated with A, B oil ports of a hydraulic control valve table, the inner openings are arranged on the other side of the filter element, each oil passage shape of the A, B cavity is L-shaped and is arranged according to different, and the filter core is located this nodical outside certain distance, generally requires more than 3 millimeters, and in this position, the oil duct mouth enlarges as far as possible to the installation of holding large cross-section filter core, filter core one end and valve block contact, and the other end contacts with the valve barrel, forms fixed position relation.

4. The dual stack filter of claim 3, wherein: the valve block and the valve sleeve are connected in a threaded or flange connection mode, the left end and the right end of the valve block are respectively provided with inner (outer) threads, and the corresponding valve sleeve is provided with corresponding outer (inner) threads; or the left side and the right side of the valve block are provided with a plurality of mounting holes around the circular opening, and the valve sleeve is connected with the valve block in a flange bolt mode; an end face sealing element is arranged between the valve sleeve and the valve block to prevent external leakage.

5. The dual stack filter of claim 3, wherein: the filter core adopts "disc" plate-type filter core or cylinder "tube-shape" type filter core, and filter core cross-section circle radius R ≧ 10mm, and filter core cross-section circle latus rectum is more than 3 times for the control valve latus rectum of protection.

6. The dual stack filter of claim 3, wherein: the valve sleeve is a shell sleeve type component with a certain internal space, the appearance of the valve sleeve is a rotary geometric body, the valve sleeve has the function of fixing the filter element and is connected with the valve block to form a sealing space relative to the outside, and a certain oil flow channel relation can be relatively formed among the valve block, the filter element and the valve sleeve.

7. The dual stack filter of claim 5, wherein: the filter element is formed by assembling two or more identical circular panel type filter elements in parallel, the circular panel type filter elements are fixed in a cylindrical filter element framework at equal intervals, and oil flow passage openings are formed in the filter element framework and are respectively communicated with the flow passage openings on the upper surface and the lower surface of the A, B oil passage of the valve block.

8. A two-up stacked filter according to any one of claims 2 to 7, wherein: and the lower end of the valve block is provided with circular counter bores corresponding to the four oil ports on the lower surfaces of the P, T, A, B oil ways, and O-shaped sealing elements are embedded in the circular counter bores.

9. A two-up stacked filter according to any one of claims 1 to 7, wherein: the valve housing and the filter element can be integrated into a whole.