Filtering structure and servo valve with same

Abstract

The utility model discloses a filtering structure and a servo valve provided with the filtering structure, and relates to the technical field of oil liquid filtering devices, the key point of the technical scheme is that the filtering structure comprises a pipe body, the pipe body is composed of a liquid inlet pipe and a liquid outlet pipe, and the inner diameter of the liquid inlet pipe is larger than that of the liquid outlet pipe; a bearing frame is arranged in the liquid inlet pipe, a movable shaft is rotationally arranged on the bearing frame, a filter cartridge with filter holes uniformly distributed in the side surface is arranged at one end, far away from the bearing frame, of the movable shaft, an opening is formed in the bottom of the filter cartridge, and propeller blades are arranged on the part, between the bearing frame and the filter cartridge, of the movable shaft; and one end, far away from the movable shaft, of the filter cartridge is in sliding fit with the inner wall of the liquid outlet pipe. The propeller blade and the filter cartridge which rotate coaxially are arranged in the pipe body, so that the pipe body can drive the filter cartridge to rotate under the power action of oil liquid after being connected into a system, impurities attached to the upper end of the pipe body are continuously thrown away through centrifugal force while the pipe body is used for filtering, and it is guaranteed that an oil path is always unobstructed in the filtering process.

Description

Technical Field

[0001] The utility model relates to the technical field of oil filtration devices, and particularly relates to a filtration structure and a servo valve provided with the filtration structure. Background Technique

[0002] In a control system with a hydraulic cycle, there are precise component fittings inside the equipment. For example, in the oil hydraulic control system of a servo valve, due to the precise and integral internal structure of the servo valve, impurities or metal chips entrained inside need to be removed before and after the oil enters the valve body to avoid scratching the internal structure. Therefore, the oil needs to be filtered during circulation to ensure that the impurities carried out during the circulation process can be removed from the oil, thereby protecting the internal components of the equipment from being damaged. However, after the existing filtration structure filters for a period of time, the filter screen will cause the impurities to always adhere to the filter screen due to the flow of the liquid, which will hinder the flow of the oil and make the overall hydraulic circulation system unstable.

[0003] In view of this, a design or technical improvement is proposed to solve the above problems.

[0004] The above content is only used to assist in understanding the technical solution of the utility model, and does not represent an admission that the above content is the closest prior art. Summary of the Invention

[0005] The purpose of the utility model is to solve the above deficiencies and provide a filtration structure and a servo valve provided with the filtration structure.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A filtration structure includes a pipe body, which is composed of a liquid inlet pipe and a liquid outlet pipe, wherein the inner diameter of the liquid inlet pipe is larger than that of the liquid outlet pipe; a bearing bracket is arranged inside the liquid inlet pipe, a movable shaft is rotatably arranged on the bearing bracket, a filtration cylinder with filter holes evenly distributed on the side is arranged at one end of the movable shaft far away from the bearing bracket, and the bottom of the filtration cylinder is open. A propeller blade is arranged on the part of the movable shaft between the bearing bracket and the filtration cylinder; the end of the filtration cylinder far away from the movable shaft is in sliding fit with the inner wall of the liquid outlet pipe.

[0008] Furthermore, a conical guide plate is arranged between the movable shaft and the filtration cylinder.

[0009] Furthermore, a scraping plate that is in movable fit with the outer surface of the filtration cylinder is arranged on the inner wall of the liquid inlet pipe.

[0010] Furthermore, a metal hose communicated with the inside of the liquid inlet pipe is arranged on the liquid inlet pipe, and the connection port is located on the side opposite to the rotation direction of the scraping plate and the filtration cylinder. The end of the metal hose far away from the liquid inlet pipe is communicated with a debris collection cylinder.

[0011] Further, the impurity collection cylinder includes a cylinder body and a cap screwed to the cylinder body.

[0012] Further, a reverse flow cylinder which is conical and open at both the upper and lower ends is fixedly arranged on the inner wall of the impurity collection cylinder, and the end with the larger opening of the reverse flow cylinder faces the metal hose.

[0013] Further, a clamping clip for clamping the impurity collection cylinder is arranged on the outer surface of the liquid inlet pipe.

[0014] A servo valve includes the above-mentioned filtering structure.

[0015] Compared with the prior art, the beneficial effect of this solution is that: in the present utility model, a propeller blade and a filter cylinder that rotate coaxially are arranged inside the pipe body, so that after the pipe body is connected to the system, the filter cylinder is driven to rotate under the action of the power of the oil liquid, and thus, while filtering, the impurities attached to the upper end are continuously thrown away by centrifugal force, ensuring that the oil circuit is always unobstructed during the filtering process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 is a front three-dimensional schematic view of the present utility model;

[0018] Figure 2 is a sectional three-dimensional schematic view of the present utility model;

[0019] Figure 3 is an internal structure schematic view of the pipe body in the present utility model;

[0020] Figure 4 is a sectional schematic view of the cylinder body in the present utility model.

[0021] In the figure: 1, pipe body; 11, liquid inlet pipe; 12, liquid outlet pipe; 2, bearing frame; 21, movable shaft; 22, filter cylinder; 23, propeller blade; 3, deflector; 4, scraper; 5, metal hose; 51, impurity collection cylinder; 52, cylinder body; 53, cap; 6, reverse flow cylinder; 7, clamping clip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present utility model.

[0023] As Figures 1-4 shown, a filtering structure includes a pipe body 1, which is composed of a liquid inlet pipe 11 and a liquid outlet pipe 12. The inner diameter of the liquid inlet pipe 11 is larger than that of the liquid outlet pipe 12. A bearing frame 2 is arranged inside the liquid inlet pipe 11. A movable shaft 21 is rotatably arranged on the bearing frame 2. One end of the movable shaft 21 away from the bearing frame 2 is provided with a filter cylinder 22 with filter holes evenly distributed on the side surface. The bottom of the filter cylinder 22 is open. A propeller blade 23 is arranged on the part of the movable shaft 21 between the bearing frame 2 and the filter cylinder 22. One end of the filter cylinder 22 away from the movable shaft 21 is in sliding fit with the inner wall of the liquid outlet pipe 12. This structure is mainly used for the circulating liquid path system of a servo valve, but can also be used in other control systems with oil circulation. This structure can be arranged in the front oil path or the rear oil path of the servo valve, as long as it is ensured that the direction of the oil entering the pipe body 1 is from the liquid inlet pipe 11 to the liquid outlet pipe 12. When the structure is connected to the oil path system, the oil first enters the inside of the liquid inlet pipe 11, and part of the kinetic energy is converted into the mechanical energy of the propeller blade 23 when passing through the propeller blade 23, causing it to rotate. Then, the filter cylinder 22 is driven to rotate synchronously through the movable shaft 21. The oil enters its interior through the filter holes on the filter cylinder 22 and then flows to the liquid outlet pipe 12 to be sent out of the pipe body 1. During this process, the continuous rotation of the filter cylinder 22 will continuously throw away the impurities filtered out from the oil and attached to the surface by centrifugal force, ensuring that the filter holes are always unblocked during the oil path circulation process and making the overall system stable.

[0024] In one embodiment, a conical guide plate 3 is arranged between the movable shaft 21 and the filter cylinder 22. Through the arrangement of the guide plate 3, the resistance of the liquid flowing through the filter cylinder 22 is reduced, and the liquid is diverted to the outer side wall of the filter cylinder 22, playing a role in guiding the oil path.

[0025] In one embodiment, a scraping plate 4 that is in movable fit with the outer surface of the filter cylinder 22 is arranged on the inner wall of the liquid inlet pipe 11. Through the arrangement of the scraping plate 4, the scraping plate 4 will always scrape the surface of the filter cylinder 22 during the rotation of the filter cylinder 22, thereby scraping off the impurities attached to its surface and further ensuring the unblockedness of the filter holes of the filter cylinder 22.

[0026] In one embodiment, a flexible metal hose 5 communicating with the inside thereof is provided on the liquid inlet pipe 11, and the connection port is located on the side opposite to the rotation direction of the scraping plate 4 and the filter cylinder 22. The end of the flexible metal hose 5 away from the liquid inlet pipe 11 communicates with a debris collection cylinder 51. Through the arrangement of the debris collection cylinder 51, when the liquid continuously flows, impurities will flow through the flexible metal hose 5 into the debris collection cylinder 51 to be collected, so that the impurities scraped by the scraping plate 4 will not accumulate inside the liquid inlet pipe 11.

[0027] In one embodiment, the debris collection cylinder 51 includes a cylinder body 52 and a cap 53 threadedly connected to the cylinder body 52. After a certain amount of impurities are collected inside the debris collection cylinder 51, the cap 53 can be directly unscrewed to clean the inside thereof after closing the oil circuit, improving the convenience of the work.

[0028] In one embodiment, a reverse blocking cylinder 6 which is conical and has openings at both the top and bottom is fixedly provided on the inner wall of the debris collection cylinder 51. The end of the reverse blocking cylinder 6 with a larger opening faces the flexible metal hose 5. The arrangement of the reverse blocking cylinder 6 causes the impurities to be guided to the small opening position and pass through after entering the cylinder body 52, and then be collected in the part between the outer surface of the reverse blocking cylinder 6 and the side wall of the cylinder body 52, reducing the probability of the impurities flowing back into the liquid inlet pipe 11 and improving the collection efficiency and stability.

[0029] In one embodiment, a clamping clip 7 for clamping the debris collection cylinder 51 is provided on the outer surface of the liquid inlet pipe 11. When the oil circuit is operating, the debris collection cylinder 51 can be clamped on the clamping clip 7 to prevent it from shaking. When the impurities inside need to be cleaned, it can be removed from the clamping clip 7 for adjusting the direction.

[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes falling within the meaning and scope of the equivalent elements of the claims in the present utility model.

Claims

1. A filtering structure, comprising a pipe body (1), characterized in that: The pipe body (1) is composed of a liquid inlet pipe (11) and a liquid outlet pipe (12), wherein the inner diameter of the liquid inlet pipe (11) is larger than that of the liquid outlet pipe (12); A bearing frame (2) is arranged inside the liquid inlet pipe (11), a movable shaft (21) is rotatably arranged on the bearing frame (2), a filter cylinder (22) with filter holes evenly distributed on the side is arranged at one end of the movable shaft (21) far away from the bearing frame (2), and the bottom of the filter cylinder (22) is open. A propeller blade (23) is arranged on the part of the movable shaft (21) between the bearing frame (2) and the filter cylinder (22); One end of the filter cylinder (22) far away from the movable shaft (21) is in sliding fit with the inner wall of the liquid outlet pipe (12).

2. The filtering structure according to claim 1, wherein: A conical guide plate (3) is arranged between the movable shaft (21) and the filter cylinder (22).

3. The filtering structure according to claim 1, wherein: A scraping plate (4) that is in movable fit with the outer surface of the filter cylinder (22) is arranged on the inner wall of the liquid inlet pipe (11).

4. The filtering structure according to claim 3, wherein: A metal hose (5) communicating with the inside of the liquid inlet pipe (11) is arranged on the liquid inlet pipe (11), and the connection port is located on the side opposite to the rotation direction of the scraping plate (4) and the filter cylinder (22). One end of the metal hose (5) far away from the liquid inlet pipe (11) communicates with a debris collection cylinder (51).

5. The filtering structure according to claim 4, wherein: The debris collection cylinder (51) includes a cylinder body (52) and a cap (53) threadedly connected to the cylinder body (52).

6. The filtering structure according to claim 4 or 5, characterized in that: A reverse blocking cylinder (6) that is conical and open at both the top and bottom is fixedly arranged on the inner wall of the debris collection cylinder (51), wherein the end with the larger opening of the reverse blocking cylinder (6) faces the metal hose (5).

7. The filtering structure according to claim 5, characterized in that: A clamping clip (7) for clamping the debris collection cylinder (51) is arranged on the outer surface of the liquid inlet pipe (11).

8. A servo valve, characterized in that: It includes the filtering structure according to any one of claims 1-7.

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