Hydraulic filter element and filter

Abstract

The hydraulic filter element comprises an annular filter medium, a first end cover, a second end cover and a bypass valve, the first end cover and the second end cover are connected to the annular filter medium, the annular filter medium is provided with a central cavity arranged around the central axis of the annular filter medium, and a central framework is arranged in the central cavity. The first end cover and the second end cover are respectively provided with a first opening and a second opening which are communicated with the central cavity; the bypass valve is arranged at the first opening of the first end cover; wherein a positioning seat is arranged on the central framework and is used for being connected with a bypass valve. According to the technical scheme, the center framework is arranged in the center cavity, and the positioning seat is arranged on the center framework and used for being connected with the bypass valve so as to position the bypass valve. According to the structure, the bypass valve can be supported in the filter element, and the size of the bypass valve outside the filter element is reduced; and when the bypass valve has a rough filtration function, the bypass valve can stably filter the hydraulic oil.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, and in particular relates to a hydraulic filter element and a filter. Background Art

[0002] A hydraulic filter element is a filter element used in a hydraulic system. Its main function is to remove impurities and particles from the hydraulic oil to protect key components in the hydraulic system, such as pumps, valves, and actuators, from wear and damage.

[0003] The bypass valve of current hydraulic filter elements is always connected to the filter end cap. When the hydraulic return oil becomes clogged on the filter paper surface, the filter element resistance increases, and the hydraulic oil intake decreases. When the resistance increases to a certain level, to ensure sufficient hydraulic oil in the hydraulic pipeline, the bypass valve is opened under pressure, and the hydraulic oil enters the filter element through the bypass valve. Therefore, some filter elements are designed with a coarse filtration function in the valve body structure, but due to the lack of effective support of this structure, the bypass valve is not stable in use. Utility Model Content

[0004] The main purpose of the utility model is to provide a hydraulic filter element and a filter, aiming to solve the technical problem that the current hydraulic filter element is not stable enough in use after the bypass valve has a coarse filtering function.

[0005] To achieve the above-mentioned purpose, the hydraulic filter element proposed by the present invention includes:

[0006] an annular filter medium having a central cavity defined around a central axis thereof, wherein a central skeleton is disposed within the central cavity;

[0007] a first end cap and a second end cap connected to the annular filter medium, the first end cap and the second end cap respectively having a first opening and a second opening communicating with the central cavity; and

[0008] a bypass valve, disposed at the first opening of the first end cover;

[0009] Wherein, a positioning seat is provided on the central skeleton for connecting the bypass valve.

[0010] Optionally, the bypass valve includes a valve body and a spring, one end of the spring is connected to the valve body, and the other end is connected to the positioning seat.

[0011] Optionally, a pre-filter medium is provided on the valve body to filter the hydraulic oil passing through the first opening when the valve body is opened.

[0012] Optionally, the positioning seat and the valve body respectively have an axially matched positioning portion and a matching portion, so that the valve body can move axially relative to the positioning seat.

[0013] Optionally, a small hole is provided on the valve body for blocking the pre-filter medium and allowing hydraulic oil to pass through.

[0014] Optionally, it further includes a first end plate, which is arranged at the first opening and is clamped to the central skeleton.

[0015] Optionally, the first end disc has a through hole communicating with the central cavity, and the valve body is movably disposed in the through hole to control the through hole.

[0016] Optionally, a second end plate is further included, which is arranged at the second opening and is clamped to the central skeleton for sealing connection with the filter housing.

[0017] Optionally, the first end disc is provided with an elastic member for abutting against the filter housing so that the second end disc and the filter housing are tightly fitted.

[0018] The utility model also proposes a hydraulic filter, comprising:

[0019] a housing having a hydraulic oil inlet and a hydraulic oil outlet; and

[0020] Hydraulic filter element for any of the above.

[0021] The technical solution of this utility model is to dispose a central skeleton within the central cavity and to provide a positioning seat on the central skeleton for connecting and positioning the bypass valve. This structure can provide support for the bypass valve within the filter element, reducing its external volume. When the bypass valve has a coarse filtration function, it can filter the hydraulic oil more stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 This is a front view of an embodiment of a hydraulic filter provided by the utility model;

[0024] Figure 2 yes Figure 1 Cross-sectional view of section AA;

[0025] Figure 3 This is a three-dimensional structural diagram of an embodiment of a hydraulic filter element provided by the utility model;

[0026] Figure 4 yes Figure 3 A three-dimensional structural diagram from another perspective;

[0027] Figure 5 yes Figure 2 The three-dimensional structure diagram of the middle bypass valve;

[0028] Figure 6 yes Figure 5 Three-dimensional structure diagram of the middle valve body;

[0029] Figure 7 yes Figure 2 Three-dimensional structure diagram of the central skeleton.

[0030] Explanation of the reference numbers: hydraulic filter element -100, annular filter medium -1, central cavity -1a, central skeleton -2, positioning seat -21, positioning part -211, first end cover -3, first opening -3a, second end cover -4, second opening -4a, bypass valve -5, valve body -51, small hole -51a, fitting part -511, bracket -512, top cover -513, annular sealing part -514, spring -52, pre-filter medium -53, first end plate -6, through hole -6a, elastic member -61, first buckle -62, annular wall -63, second end plate -7, second buckle -71, intercepting ring groove -72, annular thin-walled structure -73, housing -200, hydraulic oil inlet -200a, hydraulic oil outlet -200b, hydraulic filter -1000.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the utility model invention of the present application, any of the currently described embodiments or preferred methods.

[0034] In the description of the present invention, it should be noted that the terms "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0036] The bypass valve of current hydraulic filter elements is always connected to the filter end cap. When the hydraulic return oil becomes clogged on the filter paper surface, the filter element resistance increases, and the hydraulic oil intake decreases. When the resistance increases to a certain level, to ensure sufficient hydraulic oil in the hydraulic pipeline, the bypass valve is opened under pressure, and the hydraulic oil enters the filter element through the bypass valve. Therefore, some filter elements are designed with a coarse filtration function in the valve body structure, but due to the lack of effective support of this structure, the bypass valve is not stable in use.

[0037] In view of this, the utility model provides a hydraulic filter element, Figures 1 to 7 This is an embodiment of the hydraulic filter element provided by the utility model. Figures 1 to 7 The hydraulic filter element 100 includes an annular filter medium 1 , a first end cover 63 and a second end cover 4 connected to the annular filter medium 1 , and a bypass valve 5 .

[0038] Specifically, the annular filter medium 1 is cylindrical and has a central cavity 1a defined around its central axis. A central framework 2 is disposed within the central cavity 1a. A first end cap 63 and a second end cap 4 respectively have a first opening 3a and a second opening 4a communicating with the central cavity 1a. A bypass valve 5 is disposed at the first opening 3a of the first end cap 63. A positioning seat 21 is provided on the central framework 2 for connecting and positioning the bypass valve 5. It should be noted that the first end cap 63 and the second end cap 4 are sealedly connected to the ends of the annular filter medium 1, and this connection may be achieved by heat-melt welding, adhesive bonding, or other methods.

[0039] In the technical solution of the present invention, a central framework 2 is disposed within the central cavity 1a, and a positioning seat 21 is provided on the central framework 2 for connecting and positioning the bypass valve 5. This structure provides support for the bypass valve 5 within the filter element 100, reducing its external volume. Furthermore, when the bypass valve 5 performs a coarse filtration function, it can filter the hydraulic oil more stably.

[0040] To facilitate the connection of the bypass valve 5 to the positioning seat 21, please refer to Figure 2 and Figure 5 In one embodiment of the present invention, the bypass valve 5 includes a valve body 51 and a spring 52. The valve body 51 extends axially from the first opening 3a toward the central cavity 1a. The spring 52 also extends axially, with one end connected to the valve body 51 and the other end connected to the positioning seat 21, thereby achieving a preliminary connection between the bypass valve 5 and the positioning seat 21. It should be noted that when the bypass valve 5 is not open, the spring 52 is in a compressed state.

[0041] To be able to open the bypass valve 5, see Figure 2 and Figure 5 To perform a coarse filtration of the hydraulic oil passing through it, in one embodiment of the present invention, a pre-filter medium 53 is provided on the valve body 51. Specifically, the valve body 51 includes an axially extending bracket 512, to which the pre-filter medium 53 is connected, forming a filter layer at the outlet of the bypass valve 5. When the bypass valve 5 (that is, the valve body 51 is movable) is opened, the hydraulic oil passing through the first opening 3a is filtered.

[0042] In order to better position the valve body 51 of the bypass valve 5, please refer to Figure 2 、 Figure 6 and Figure 7 In one embodiment of the present invention, the positioning seat 21 and the valve body 51 respectively have an axially matched positioning portion 211 and a matching portion 511. Specifically, the positioning seat 21 and the central skeleton 2 are integrally injection molded to enhance the stability of the positioning seat 21. A columnar positioning portion 211 is provided at the center of the positioning seat 21. The matching portion 511 is a positioning channel formed at the bottom of the valve body 51. The positioning portion 211 and the positioning channel adapt to each other and slide together. While positioning the valve body 51, it is also beneficial for the valve body 51 to make axial movement relative to the positioning seat 21. Preferably, the spring 52 is provided in the positioning channel and is sleeved on the positioning portion 211 to limit the range of motion of the spring 52 and prevent it from falling off. Of course, the embodiment of the present invention is not limited to this. The positioning portion 211 may also be provided on the valve body 51, and the positioning channel may also be provided on the positioning seat.

[0043] To ensure that the hydraulic oil can continue to flow through when both the annular filter medium 1 and the pre-filter medium 53 are blocked, please refer to Figure 2 and Figure 6In one embodiment of the present invention, a small hole 51a is defined in the valve body 51. Specifically, the small hole 51a is located at the bottom of the valve body 51 and communicates with the positioning channel. Correspondingly, a hole is defined in the positioning column and communicates with the positioning channel. This hole connects the central cavity 1a to the hydraulic oil outlet 200b, allowing a small amount of hydraulic oil to pass through, thereby preventing malfunctions in the hydraulic system due to lack of lubrication. Of course, the present invention is not limited to this embodiment; the small hole may also be defined at other locations on the bottom of the valve body 51.

[0044] For better installation of bypass valve 5, please refer to Figure 2 In one embodiment of the present invention, a first end plate is further included, to which the bypass valve 5 is mounted. The first end plate is positioned at the first opening 3a and is circumferentially provided with a plurality of first clips 62 . Each first clip 62 is engaged with a corresponding clip block on the central frame 2 . When engaged, the first end plate and the first end cover 63 are in close contact, thereby sealing the first opening 3a.

[0045] To realize the function of bypass valve 5, please refer to Figure 2 、 Figure 3 and Figure 5 In one embodiment of the present invention, the first end disc has a through hole 6a communicating with the central cavity 1a, and the valve body 51 is movably mounted within the through hole 6a. Specifically, the valve body 51 has a top cover 513, the opening of which is located below the top cover 513. The connection between the top cover 513 and the bracket 512 forms the inlet of the valve body 51. When the bypass valve 5 is closed, the top cover 513 abuts the through hole 6a. When the bypass valve 5 is opened, the valve body 51 moves under pressure, the top cover 513 moves away from the through hole 6a, and the hydraulic oil enters the valve body 51 through the inlet, where it is then coarsely filtered by the pre-filter medium 53. In addition, the valve body 51 also has an annular sealing portion 514 extending axially, and the annular sealing portion 514 is sleeved on the outer periphery of the bracket 512 of the valve body 51. The first end disc is correspondingly provided with an annular wall 63 extending axially. When the valve body 51 moves axially, the annular sealing portion 514 is always tightly connected to the annular wall 63 to prevent hydraulic oil from entering the central cavity 1a from the connection between the two.

[0046] To prevent unfiltered hydraulic oil from entering the central cavity 1a through the second opening 4a, see Figure 2 and Figure 4In one embodiment of the present invention, a second end plate 7 is further included. The second end plate 7 is provided at the second opening 4a and is provided with a plurality of second clips 71 along the circumferential direction. Each second clip 71 is respectively engaged with a correspondingly provided clip on the central skeleton 2. The second end plate 7 has an annular thin-walled structure 73 provided along the circumferential direction and is designed to be elastic. Its maximum outer diameter is larger than the inner pore diameter of the filter seat. When the filter element 100 is installed in the filter housing 200, the annular thin-walled structure 73 is compressed inwardly so as to be tightly attached to the inner wall of the filter housing 200, thereby forming a self-seal in the radial direction. The annular thin-walled structure 73 and the annular filter medium 1 form an interception annular groove 72. When the hydraulic oil is filtered, the particulate matter blocked by the annular filter medium 1 will be deposited in the interception annular groove 72 at the bottom for collection, thereby preventing the leakage of pollutants when the filter element 100 is disassembled.

[0047] Furthermore, in order to make the annular thin-walled structure 73 of the second end plate 7 and the inner wall of the filter housing 200 close to each other, please refer to Figure 2 and Figure 3 In one embodiment of the present invention, the first end disc is provided with an elastic member 61. When the filter element 100 is installed, the elastic member 61 is compressed, thereby causing the first and second end discs 7 at both ends of the filter element 100 to tightly abut against the inner wall of the filter housing 200. This enhances the sealing effect between the first end disc and the first end cap 63, and the second end disc 7 and the filter housing 200 fit tightly together, similarly enhancing the radial sealing effect between its annular thin-walled structure 73 and the inner wall of the filter housing 200.

[0048] The present invention also proposes a hydraulic filter 1000, see Figures 1 to 7 , comprising a housing 200 and a hydraulic filter element 100 according to any one of the above embodiments, wherein the housing 200 has a hydraulic oil inlet 200a and a hydraulic oil outlet 200b.

[0049] Among them, see Figure 2 The hydraulic oil inlet 200a is set corresponding to the first opening 3a, and the hydraulic oil outlet 200b is set corresponding to the second opening 4a.

[0050] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the concept of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be based on the appended claims.

Claims

1. A hydraulic filter element, characterized in that: include: An annular filter medium (1), the annular filter medium (1) having a central cavity (1a) set around its central axis, a central skeleton (2) being provided in the central cavity (1a); a first end cap (3) and a second end cap (4) connected to the annular filter medium (1), the first end cap (3) and the second end cap (4) respectively having a first opening (3a) and a second opening (4a) communicating with the central cavity (1a); and A bypass valve (5) is provided at the first opening (3a) of the first end cover (3); Wherein, a positioning seat (21) is provided on the central skeleton (2) for connecting the bypass valve (5).

2. The hydraulic filter element according to claim 1, characterized in that: The bypass valve (5) comprises a valve body (51) and a spring (52), one end of the spring (52) being connected to the valve body (51), and the other end being connected to the positioning seat (21).

3. The hydraulic filter element according to claim 2, characterized in that: A pre-filter medium (53) is provided on the valve body (51) to filter the hydraulic oil passing through the first opening (3a) when the valve body (51) is opened.

4. The hydraulic filter element according to claim 3, characterized in that: The positioning seat (21) and the valve body (51) respectively have an axially matched positioning portion (211) and a matching portion (511), so that the valve body (51) can move axially relative to the positioning seat (21).

5. The hydraulic filter element according to claim 3, characterized in that: The valve body (51) is provided with a small hole (51a) for blocking the pre-filter medium (53) and allowing hydraulic oil to pass through.

6. The hydraulic filter element according to claim 2, characterized in that: It also includes a first end plate (6), which is arranged at the first opening (3a) and is clamped to the central frame (2).

7. The hydraulic filter element according to claim 6, characterized in that: The first end disc (6) has a through hole (6a) communicating with the central cavity (1a), and the valve body (51) is movably arranged in the through hole (6a) to control the through hole (6a).

8. The hydraulic filter element according to claim 6, characterized in that: It also includes a second end disc (7), which is arranged at the second opening (4a) and is clamped to the central skeleton (2) for sealing connection with the filter housing (201).

9. The hydraulic filter element according to claim 8, characterized in that: The first end disc (6) is provided with an elastic member (61) for abutting against the filter housing (201) so that the second end disc (7) and the filter housing are tightly matched.

10. A hydraulic filter, characterized in that: include: A housing (200) having a hydraulic oil inlet (200a) and a hydraulic oil outlet (200b); as well as, A hydraulic filter element according to any one of claims 1 to 9.

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