Large-pollutant-holding-capacity hydraulic filter suitable for high-dust working environment

Abstract

The invention discloses a hydraulic filter with large pollutant holding capacity, which is suitable for a high-dust working environment. The whole equipment main body mainly comprises a filter shell, a filter base, a filter element (comprising an inner layer, a middle layer and an outer layer), a spiral rib plate, a spring and the like. Fluid flows in from the base inlet, passes through the filter element in the shell cavity, enters the base outlet and then flows out. The spiral rib plates are close to the outer surface of the filter element, so that rotational flow is formed in the cavity, and the dirt holding performance of the filter is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to fluid filtration, and in particular to the field of hydraulic system filters. Technical Background

[0002] Hydraulic mining exoskeleton robots often operate in complex environments such as mines or on the surface, often filled with dust, moisture, and impurities. Their hydraulic systems, as core components for power assistance, support, and flexible motion control, must be highly stable and reliable. Hydraulic filters play a crucial role in this system, efficiently filtering all types of particulate impurities from the hydraulic oil, ensuring oil cleanliness and maintaining normal system operation.

[0003] Hydraulic filters, with their sophisticated filtration structure, effectively intercept these particulate contaminants, ensuring that the hydraulic oil maintains a high level of cleanliness. This is particularly critical for mining exoskeleton robots. Clean oil reduces the wear rate of internal system components, improves the response speed and control accuracy of hydraulic actuators, and extends the service life of the entire system, ensuring the robot's continuous and stable operation in complex mining environments and reducing the occurrence of sudden failures.

[0004] However, the filters currently used in the hydraulic systems of mining exoskeleton robots still have some design and performance deficiencies. From a structural design perspective, many filters are relatively simple and cannot fully adapt to the complex operating conditions of high dust, high humidity, and high-particle contamination found in mines. Their internal flow field design is also relatively simple, resulting in uneven hydraulic oil flow within the filter. This can cause localized areas of excessively high or low flow rates, impacting filtration efficiency. Furthermore, filter element utilization needs to be improved. In actual use, dust accumulation on the filter surface is uneven, leaving some areas unutilized. This leads to insufficient migration depth within the filter, causing premature clogging and rapid reaching of the filter's dirt holding capacity, impacting filtration performance. This not only increases maintenance frequency and filter element replacement costs, but can also reduce the equipment's continuous operation time, impacting the mining exoskeleton's operational efficiency and the quality of on-site task completion.

[0005] Based on the applicant's research, adding spiral ribs to the filter element surface creates a certain tangential velocity for the oil flowing along the filter element surface, thereby promoting a more even distribution of particulate impurities across the filter element surface. The key to generating this circumferential tangential velocity on the filter element surface is ensuring that the spiral ribs are tightly connected to the filter element surface, without any gaps. Summary of the Invention

[0006] The purpose of this patent is to provide a hydraulic filter structure with a large dirt holding capacity suitable for high-dust working environments, so as to solve the problem mentioned in the above background technology that most of the particulate impurities in the existing hydraulic filters are deposited on the surface of the filter element, increase the migration depth of the particles, increase the dirt holding capacity, and thus improve the life of the hydraulic filter.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a circle of spiral ribs is added to the outer surface of a conventional filter element, with the filter outlet and inlet located at the bottom and top, respectively. This changes the flow field distribution on the filter element surface, forming a spiral flow from bottom to top, generating tangential velocity on the filter element surface, and increasing the area of ​​particle impurities distributed on the filter element surface, thereby improving filter element utilization and extending filter life. To ensure that a vortex can form within the cavity, the spacing between the spiral ribs 6 and the outer layer 5 of the filter element is critical. According to the applicant's numerical simulation calculations, this distance should be as small as possible, so it cannot be added to the outer shell 2.

[0008] Preferably, the spiral ribs are located on the outer surface of the filter element, that is, in the entire filter cavity, and are in close contact with the outer surface of the filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The accompanying drawings are only for the purpose of illustrating the initial embodiments and are not to be considered as limiting the present invention. Like reference characters denote like parts throughout the drawings.

[0010] Figure 1 This is a front view sectional view of the patented invention;

[0011] In the figure: 1-base; 2-housing; 3-inner layer of filter element; 4-middle layer of filter element; 5-outer layer of filter element; 6-spiral rib; 7-spring; 8-housing sealing ring; 9-bolt sealing ring; 10-lower cover sealing ring; 11-oil outlet; 12-upper cover; 13-lower cover; 14-lower inlet.

[0012] Figure 2 It is a numerical calculation analysis conducted on the patent of this invention to determine the maximum distance between the spiral ribs 6 and the outer layer 5 of the filter element. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0014] Reference Figure 1The present invention provides a new type of hydraulic filter mechanism: it includes a base 1, a shell 2 is provided above the base 1, the shell 2, an oil outlet 11 is provided above the shell 2, sealing grooves are provided at the upper and lower parts of the shell 2, and bolt sealing rings 9 and shell sealing rings 8 are provided inside respectively. In addition, there is a circle of spiral ribs 6 on the outer surface of the filter element, that is, in the filter cavity. There is a filter element in the filter cavity, which mainly includes a filter element outer layer 5, a filter element middle layer 4 and a filter element inner layer 3. There is an upper cover 12 above the filter element, a spring 7 above the upper cover, and the other end of the spring contacts the shell 2. There is a lower cover 8 below the filter element, a sealing groove is provided at the lower part of the lower cover, and a lower cover sealing ring 10 is provided inside. The lower inlet 14 is connected to the cavity outside the filter element, and the incoming flow direction is consistent with the spiral rib 6.

[0015] Working principle: Reference Figure 1 The hydraulic oil passes through the filter at the lower inlet (14) and reaches the cavity of the filter housing 2 and the outer layer 5 of the filter element. It flows in the cavity. Due to the action of the spiral ribs 6, the oil generates a vortex from bottom to top, generating a tangential velocity on the surface of the filter element. The tangential velocity of the oil drives the particulate impurities, causing the particulate impurities to flow to the upper area of ​​the filter element 5, rather than just accumulating on the lower surface of the outer layer 5 of the filter element, thereby improving the utilization rate of the filter element and extending the life of the filter. The bolt seal ring 9 and the housing seal ring 8 prevent the oil from flowing out of the upper and lower parts of the housing respectively, playing a sealing role. The oil enters the interior of the filter element from the cavity through the outer layer 5 of the filter element, the middle layer 4 of the filter element and the inner layer 3 of the filter element in turn, and then flows out of the filter through the oil outlet 11. The upper cover 12 ensures that the oil flows out through the filter element, and the spring 7 ensures that the position of the entire filter element is fixed to prevent it from falling off. The lower cover seal ring 10 plays a sealing role.

[0016] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic filter with a large dirt holding capacity suitable for high dust working environments, the main body of which includes a base (1), an outer shell (2), a filter core inner layer (3), a filter core middle layer (4), and a filter core outer layer (5), characterized in that: The outer layer (5) of the filter element has a spiral rib (6) on the outside, which generates a vortex in the cavity. The bottom and top of the housing are respectively provided with a sealing ring (8) and a sealing ring (9). The upper and lower parts of the filter element are respectively provided with an upper cover (12) and a lower cover (13). The inner side of the lower cover (13) has a sealing ring (10). The upper part of the housing (2) has a spring (7), and the upper part has an oil outlet (11).

2. A hydraulic line filter according to claim 1, characterized in that: The base (1) is connected to the housing (2) and is also connected to the lower cover (13) of the filter element.

3. The hydraulic line filter according to claim 1, characterized in that: The flow direction of the lower inlet (14) is consistent with the spiral rib (6), and the oil can quickly generate a vortex in the filter cavity. The oil outlet (11) is located at the upper part, which increases the actual use area of ​​the filter element inner layer (3), the filter element middle layer (4), and the filter element outer layer (5) during filtration.

4. The hydraulic line filter according to claim 1, characterized in that: The spiral ribs are tightly connected to the surface of the filter element (5), have matching sizes, and have very small gaps (less than 1.5 mm) or no gaps.

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