CN-121971905-A - Stacked filter device

CN121971905ACN 121971905 ACN121971905 ACN 121971905ACN-121971905-A

Abstract

The invention provides a stacked filter device which comprises a base, an outer cylinder assembly, a guide pillar, a coarse filter channel, a fine filter channel and a stacked filter element, wherein an oil inlet flow channel and an oil return flow channel are arranged in the base, the outer cylinder assembly is fixedly connected to the base and forms a filter cavity together with the base, the filter cavity is communicated with the oil inlet flow channel, the lower end of the guide pillar is fixedly connected to the base, the upper end of the guide pillar extends into the filter cavity, an axially extending oil guide channel is arranged in or on the surface of the guide pillar, an outlet of the oil guide channel is communicated with the oil return flow channel, the stacked filter element is coaxially sleeved on the guide pillar and axially stacked, an anti-rotation structure is arranged on the outer peripheral surface of the guide pillar, a matching part matched with the anti-rotation structure is arranged in a central through hole of the stacked filter element, the coarse filter channel is formed between every two adjacent filter element units, and the fine filter channel is formed in the filter element unit.

Inventors

LI YONGXING
TENG JINTU
FU ZUFAN
ZHANG YUYING
HU YEMING
Xiao Shixuan

Assignees

中国铁建重工集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260127

Claims (10)

1. A stacked-type filtering device, characterized by comprising the following steps: the base is internally provided with an oil inlet flow passage and an oil return flow passage; The outer cylinder assembly is fixedly connected to the base and forms a filtering cavity together with the base, and the filtering cavity is communicated with the oil inlet flow passage; the lower end of the guide pillar is fixedly connected to the base, the upper end of the guide pillar extends into the filter cavity, an oil guide channel extending along the axial direction is arranged in or on the surface of the guide pillar, and an outlet of the oil guide channel is communicated with the oil return flow channel; The stacked filter element is formed by coaxially sleeving a plurality of filter element units on the guide post and stacking the filter element units along the axial direction; the filter element comprises a plurality of filter element units, wherein the outer peripheral surface of the guide post is provided with an anti-rotation structure, a matching part matched with the anti-rotation structure is arranged in a central through hole of the stacked filter element, a coarse filter channel is formed between every two adjacent filter element units, a fine filter channel is formed in each filter element unit, and the coarse filter channel and the fine filter channel are connected in series and are communicated with an inlet of the oil guide channel.
2. The stacked filtration device of claim 1, wherein the cartridge unit comprises first and second filter sections stacked in an axial direction; when two filter element units are stacked, the coarse filtering channel is formed between the second filtering part of one filter element unit and the first filtering part of the opposite filter element unit, and the second filtering part and the inner part of the first filtering part respectively form a part of the fine filtering channel.
3. The stacked filter apparatus of claim 2, wherein, of the second filter portion and the first filter portion forming the coarse filter passage, a first flow guiding structure is formed at an end surface of the second filter portion facing the first filter portion, a second flow guiding structure is formed at an end surface of the first filter portion facing the second filter portion, the first flow guiding structure and the second flow guiding structure enclose a first flow through space, and a region where the first flow guiding structure and the second flow guiding structure are close to each other forms a slit structure, the slit structure being located between the filter cavity and the first flow through space; The slit structure is used for intercepting solid particles with the particle diameter larger than that of the slit structure and forming a first-stage pressure drop, and the first flowing space is used for introducing oil passing through the slit structure into the second filtering part and the first filtering part.
4. A stacked filtration device as claimed in claim 3 wherein said first flow directing structure is a wave-like flow directing structure and said second flow directing structure is a flow directing channel structure; the slit structure is positioned at a position where the wave crest of the wavy diversion structure is close to the diversion groove structure.
5. The stacked filter apparatus of claim 2, wherein, of the second filter portion and the first filter portion that constitute the filter element unit, a third flow guide structure is formed at an end surface of the first filter portion facing the second filter portion, a fourth flow guide structure is formed at an end surface of the second filter portion facing the first filter portion, and the third flow guide structure and the fourth flow guide structure enclose a second flow space that communicates with an inlet of the oil guide passage; The second circulation space is used for converging the oil filtered by the second filtering part and the first filtering part and then introducing the oil into the inlet of the oil guide channel.
6. The stacked filter apparatus of claim 5, wherein the third flow directing structure is a wave-shaped flow directing structure and the fourth flow directing structure is a flow directing groove structure.
7. The stacked filter apparatus of claim 2, wherein the first filter and the second filter each comprise a porous filter material, the porous filter material being formed integrally from birch-tree fibers by a compression molding process.
8. The stacked filter apparatus of claim 1, wherein the anti-rotation feature is an axial keyway formed in an outer surface of the guide post and the mating portion is a tab formed in an inner wall of the central throughbore.
9. The stacked filtration device of claim 1, further comprising a compression assembly comprising a gland sleeved on the upper end of the guide post and a lock nut threadably connected to the upper end of the guide post, the compression assembly being configured to axially compress the stacked filter cartridge via the gland and the lock nut.
10. The stacked filter apparatus of claim 1, wherein the lower end of the guide post is provided with a screw thread, the base is provided with a screw hole, and the guide post is fixedly connected with the screw hole through the screw thread.

Description

Stacked filter device Technical Field The invention relates to the technical field of hydraulic oil filtration, in particular to a stacked type filtering device. Background In the hydraulic systems of heavy equipment such as coal mines, engineering machinery and the like, high-precision elements such as electrohydraulic proportional valves, servo valves and the like have extremely strict requirements on the cleanliness of hydraulic oil. However, in an actual working environment (such as underground coal mine), the hydraulic oil is very easy to mix into pollutants such as colloid, oil sludge and metal abrasive dust generated by self oxidation in the running process of coal dust, rock dust and water and equipment, so that the pollution degree of the oil is seriously out of standard. The traditional hydraulic filter mainly adopts a single-layer filter element structure or simple multi-filter element parallel connection configuration, has obvious limitations in practical application, firstly, has single filtering level, is difficult to intercept pollutants with different particle diameters (especially micron-sized and submicron-sized particles) efficiently, has limited filtering precision, secondly, has small effective filtering area and low pollution containing capacity, is easy to quickly saturate the filter element under severe working conditions, leads to rapid rising of system pressure difference, and can not only frequently stop and replace the filter element to influence the operation continuity, but also cause puncture of filter materials due to overlarge pressure difference to cause secondary pollution, and thirdly, has insufficient consideration on the fixation and sealing of the filter element in structural design, and the filter element is easy to displace or vibrate under system pressure fluctuation and hydraulic impact to influence the filtering stability and sealing reliability. Therefore, aiming at the severe requirements of the heavy equipment hydraulic system on the cleanliness of oil under the working conditions of high pollution, high pressure and continuous operation, the development of a novel filtering device which has high filtering precision, large sewage containing capacity, excellent structural stability and reliable sealing performance and can adapt to complex pollution components is urgently needed, so that high-precision hydraulic elements are effectively protected, and the working reliability and the service life of the whole hydraulic system are improved. Disclosure of Invention In view of this, the present invention provides a stacked filter apparatus that may be used in heavy equipment hydraulic systems. The embodiment of the invention provides a stacked filter device which comprises a base, an outer cylinder assembly, a guide pillar, a coarse filter channel, a fine filter channel, a stacked filter element, a plurality of filter element units and an oil guide channel, wherein an oil inlet flow channel and an oil return flow channel are arranged in the base, the outer cylinder assembly is fixedly connected to the base and forms a filter cavity together with the base, the filter cavity is communicated with the oil inlet flow channel, the lower end of the guide pillar is fixedly connected to the base, the upper end of the guide pillar extends into the filter cavity, the guide pillar is internally or externally provided with the axially extending oil guide channel, the outlet of the oil guide channel is communicated with the oil return flow channel, the stacked filter element is coaxially sleeved on the guide pillar and axially stacked, an anti-rotation structure is arranged on the outer circumferential surface of the guide pillar, a matching part matched with the anti-rotation structure is arranged in a central through hole of the stacked filter element, the coarse filter channel is formed between every two adjacent filter element units, and the fine filter channel is formed in the filter element unit, and the coarse filter channel and the fine filter channel is serially connected with the fine filter channel and is communicated with an inlet of the oil guide channel. According to the embodiment of the invention, the filter element unit comprises a first filter part and a second filter part which are stacked along the axial direction, wherein when the two filter element units are stacked, a coarse filter channel is formed between the second filter part of one filter element unit and the first filter part of the opposite filter element unit, and a part of a fine filter channel is formed between the second filter part of the other filter element unit and the inner part of the first filter part. According to the embodiment of the invention, in the second filtering part and the first filtering part forming the coarse filtering channel, a first flow guiding structure is formed on the end surface of the second filtering part facing the first filtering part, a second flow guiding structu