CN223359585U - Hydraulic filter element and filter - Google Patents

Abstract

The utility model discloses a hydraulic filter element and a filter, wherein 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 which is set around the central axis of the annular filter medium, 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, and a positioning seat is arranged on the central framework and is used for being connected with the bypass valve. In the technical scheme, the central framework is arranged in the central cavity, and the position seat is arranged on the central framework and used for being connected with the bypass valve so as to position the bypass valve. The structure can provide support for the bypass valve in the filter element, reduces the volume of the bypass valve outside the filter element, and can filter hydraulic oil more stably when the bypass valve has a rough filtering function.

Description

Hydraulic filter element and filter

Technical Field

The utility model belongs to the technical field of filters, and particularly relates to a hydraulic filter element and a filter.

Background

A hydraulic filter element is a filter element used in a hydraulic system, and is mainly used for removing impurities and particles in hydraulic oil so as to protect key components such as pumps, valves, actuators and the like in the hydraulic system from abrasion and damage.

At present, a bypass valve of the hydraulic filter element is connected to an end cover of the filter element, when hydraulic oil return is blocked on the surface of filter paper, resistance of the filter element is increased, oil inlet amount of hydraulic oil is reduced, when the resistance is increased to a certain degree, in order to ensure that a hydraulic pipeline has enough hydraulic oil, the bypass valve is opened under the action of pressure, and the hydraulic oil enters the filter element through the bypass valve. Therefore, some filter cartridges have a rough filtering function designed on the valve body structure, but the bypass valve is not stable enough to be used due to the lack of effective support of the structure.

Disclosure of utility model

The utility model mainly aims to provide a hydraulic filter element and a filter, and aims to solve the technical problem that the existing hydraulic filter element is not stable enough to use after a bypass valve has a rough filtering function.

In order to achieve the above object, the present utility model provides a hydraulic filter cartridge comprising:

An annular filter medium having a central cavity set about a central axis thereof, the central cavity having a central skeleton disposed therein;

A first end cap and a second end cap attached to the annular filter media, the first end cap and the second end cap having a first opening and a second opening, respectively, that communicate with the central cavity, and

The bypass valve is arranged at the first opening of the first end cover;

wherein, be equipped with the positioning seat on the central skeleton, be used for connecting the bypass valve.

Optionally, the bypass valve comprises a valve body and a spring, wherein one end of the spring is connected with the valve body, and the other end of the spring is connected with the positioning seat.

Optionally, a prefilter medium is disposed on the valve body, so as to filter the hydraulic oil passing through the first opening when the valve body is opened.

Optionally, the positioning seat and the valve body are respectively provided with a positioning part and a matching part which are matched axially, so that the valve body moves axially relative to the positioning seat.

Optionally, the valve body is provided with a small hole for blocking the prefilter medium and passing hydraulic oil.

Optionally, the device further comprises a first end disc, wherein the first end disc is arranged at the first opening and is clamped with the central framework.

Optionally, the first end disc is provided with a through hole communicated with the central cavity, and the valve body is movably arranged in the through hole so as to control the through hole.

Optionally, the filter further comprises a second end disc, wherein the second end disc is arranged at the second opening and is clamped with the central framework, and the second end disc is used for being connected with the filter shell in a sealing mode.

Optionally, the first end disc is provided with an elastic element for abutting against the filter housing so that the second end disc is tightly matched with the filter housing.

The utility model also provides a hydraulic filter, comprising:

A housing having a hydraulic oil inlet and a hydraulic oil outlet, and

A hydraulic cartridge according to any one of the preceding claims.

According to the technical scheme, the central framework is arranged in the central cavity, and the position seat is arranged on the central framework and used for being connected with the bypass valve so as to position the bypass valve. The structure can provide support for the bypass valve in the filter element, reduces the volume of the bypass valve outside the filter element, and can filter hydraulic oil more stably when the bypass valve has a rough filtering function.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a front view of an embodiment of a hydraulic filter provided by the present utility model;

FIG. 2 is a cross-sectional view of section A-A of FIG. 1;

FIG. 3 is a perspective view of one embodiment of a hydraulic cartridge provided by the present utility model;

FIG. 4 is a perspective view of the alternate view of FIG. 3;

FIG. 5 is a perspective view of the bypass valve of FIG. 2;

FIG. 6 is a perspective view of the valve body of FIG. 5;

fig. 7 is a perspective view of the center frame of fig. 2.

The reference numerals indicate the hydraulic filter element-100, the annular filter medium-1, the central cavity-1 a, the central framework-2, the positioning seat-21, the positioning part-211, the first end cover-3, the first opening-3 a, the second end cover-4, the second opening-4 a, the bypass valve-5, the valve body-51, the small hole-51 a, the matching part-511, the bracket-512, the top cover-513, the annular sealing part-514, the spring-52, the prefilter medium-53, the first end disc-6, the through hole-6 a, the elastic piece-61, the first buckle-62, the annular wall-63, the second end disc-7, the second buckle-71, the interception ring groove-72, the annular thin-wall structure-73, the shell-200, the hydraulic oil inlet-200 a, the hydraulic oil outlet-200 b and the hydraulic filter-1000.

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

For a better description and illustration of embodiments of the utility model, reference should be made to one or more of the accompanying drawings, but the additional details or examples used to describe the drawings should not be construed as limiting the scope of any of the inventive, presently described embodiments or preferred modes of carrying out the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are positional relationships based on the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus referred to must have a specific orientation or operate in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

At present, a bypass valve of the hydraulic filter element is connected to an end cover of the filter element, when hydraulic oil return is blocked on the surface of filter paper, resistance of the filter element is increased, oil inlet amount of hydraulic oil is reduced, when the resistance is increased to a certain degree, in order to ensure that a hydraulic pipeline has enough hydraulic oil, the bypass valve is opened under the action of pressure, and the hydraulic oil enters the filter element through the bypass valve. Therefore, some filter cartridges have a rough filtering function designed on the valve body structure, but the bypass valve is not stable enough to be used due to the lack of effective support of the structure.

In view of this, the present utility model provides a hydraulic filter element, and fig. 1 to 7 are schematic views of an embodiment of the hydraulic filter element according to the present utility model. Referring to fig. 1 to 7, the hydraulic filter cartridge 100 includes an annular filter medium 1, first and second end caps 63 and 4 connected to the annular filter medium 1, and a bypass valve 5.

Specifically, the annular filter medium 1 is cylindrical, and has a central cavity 1a set around its central axis, a central skeleton 2 is provided in the central cavity 1a, a first end cover 63 and a second end cover 4 have a first opening 3a and a second opening 4a, respectively, which communicate with the central cavity 1a, and a bypass valve 5 is provided at the first opening 3a of the first end cover 63. Wherein, be equipped with positioning seat 21 on the central skeleton 2 for connect bypass valve 5, in order to fix a position it. The first end cap 63 and the second end cap 4 are sealed to both ends of the annular filter medium 1, and may be connected by hot melt welding, adhesive bonding, or the like.

In the technical scheme of the utility model, the central framework 2 is arranged in the central cavity 1a, and the position seat 21 is arranged on the central framework 2 and is used for connecting the bypass valve 5 so as to position the bypass valve. The structure can provide support for the bypass valve 5 in the filter element 100, reduces the volume of the bypass valve 5 outside the filter element 100, and can filter hydraulic oil more stably when the bypass valve 5 has a rough filtering function.

In order to facilitate the connection of the bypass valve 5 to the positioning seat 21, referring to fig. 2 and 5, in an embodiment of the present utility model, 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, and the spring 52 also extends axially, and has one end connected to the valve body 51 and the other end connected to the positioning seat 21, so as to achieve the preliminary connection between the bypass valve 5 and the positioning seat 21. When the bypass valve 5 is not opened, the spring 52 is in a compressed state.

In order to be able to coarse filter the hydraulic oil which it passes when the bypass valve 5 is open, see fig. 2 and 5, in one embodiment of the utility model a prefilter 53 is provided on the valve body 51. Specifically, the valve body 51 includes a bracket 512 extending in the axial direction, and the prefilter 53 is connected to the bracket 512 to form a filter layer at the outlet of the bypass valve 5, and filters the hydraulic oil passing through the first opening 3a when the bypass valve 5 (i.e., the valve body 51 is movable) is opened.

In order to better locate the valve body 51 of the bypass valve 5, referring to fig. 2, 6 and 7, in an embodiment of the present utility model, the locating seat 21 and the valve body 51 have a locating portion 211 and an engaging portion 511 that are axially engaged, respectively. Specifically, the positioning seat 21 and the central framework 2 are integrally injection molded to improve stability of the positioning seat 21, a columnar positioning portion 211 is arranged in 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 are mutually adapted and in sliding fit, and the valve body 51 is axially moved relative to the positioning seat 21 while being positioned. Preferably, the spring 52 is disposed in the positioning channel and sleeved on the positioning portion 211, so as to limit the moving range of the spring 52 and prevent the spring from falling off. Of course, the embodiment of the present utility model is not limited thereto, and the positioning portion 211 may be provided to the valve body 51, and the positioning passage may be provided to the positioning seat.

In order to continue to pass through the hydraulic oil when both the annular filter medium 1 and the prefilter medium 53 are clogged, referring to fig. 2 and 6, in an embodiment of the present utility model, a small hole 51a is formed in the valve body 51. Specifically, the small hole 51a is formed at the bottom of the valve body 51 and is communicated with the positioning channel, correspondingly, a hole communicated with the positioning channel is formed in the positioning column, and the hole is communicated with the central cavity 1a until the hydraulic oil outlet 200b, so that a small amount of hydraulic oil passes through the hole to prevent the hydraulic system from being failed due to lack of lubrication. Of course, embodiments of the present utility model are not limited thereto, and the small hole may be opened at other positions of the bottom of the valve body 51.

For better mounting of the bypass valve 5, referring to fig. 2, in an embodiment of the present utility model, the bypass valve 5 further includes a first end disc, and the bypass valve 5 is mounted on the first end disc. The first end disc is disposed in the first opening 3a, and a plurality of first buckles 62 are disposed along the circumferential direction, each first buckle 62 is respectively clamped on a corresponding clamping block of the central framework 2, and after the clamping, the first end disc and the first end cover 63 are tightly attached to seal the first opening 3 a.

To perform the function of the bypass valve 5, referring to fig. 2, 3 and 5, in an embodiment of the present utility model, the first end disc has a through hole 6a communicating with the central cavity 1a, and the valve body 51 is movably disposed in the through hole 6a. Specifically, the valve body 51 has a top cover 513, and an opening of the valve body 51 is provided below the top cover 513, and a junction of the top cover 513 and the bracket 512 forms an inlet of the valve body 51. When the bypass valve 5 is closed, the top cover 513 is abutted against the through hole 6a, and when the bypass valve 5 is opened, the valve body 51 moves under the pressure, the top cover 513 leaves the through hole 6a and enables hydraulic oil to enter the valve body 51 from an inlet of the valve body 51, and rough filtration is performed through the pre-filtering medium 53. In addition, the valve body 51 further has an annular sealing portion 514 extending along an axial direction, 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 along the axial direction, and when the valve body 51 moves axially, the annular sealing portion 514 is tightly connected with the annular wall 63 all the time so as to prevent hydraulic oil from entering the central cavity 1a from the joint of the annular sealing portion 514 and the annular wall 63.

In order to prevent unfiltered hydraulic oil from entering the central cavity 1a from the second opening 4a, please refer to fig. 2 and 4, in an embodiment of the present utility model, the hydraulic oil further includes a second end plate 7, the second end plate 7 is disposed on the second opening 4a and is circumferentially provided with a plurality of second fasteners 71, and each second fastener 71 is respectively fastened to a corresponding fixture block of the central frame 2. The second end disk 7 has an annular thin-walled structure 73 disposed circumferentially and is designed to have elasticity with a maximum outer diameter greater than the filter seat inner bore diameter, and when the filter cartridge 100 is installed in the filter housing 200, the annular thin-walled structure 73 is compressed inwardly to abut against the inner wall of the filter housing 200 to form self-sealing in the radial direction. The annular thin-wall structure 73 and the annular filter medium 1 form an interception annular groove 72, and particles blocked by the annular filter medium 1 are deposited in the interception annular groove 72 at the bottom to be collected when hydraulic oil is filtered, so that leakage of pollutants when the filter element 100 is disassembled is prevented.

Further, in order to make the annular thin-wall structure 73 of the second end disc 7 tightly adhere to the inner wall of the filter housing 200, referring to fig. 2 and 3, in an embodiment of the present utility model, the first end disc is provided with an elastic member 61, and when the filter element 100 is installed, the elastic member 61 is in a compressed state, so that the first end disc and the second end disc 7 at two ends of the filter element 100 tightly abut against the inner wall of the filter housing 200. At this time, the sealing effect of the first end disk and the first end cover 63 is enhanced, and the second end disk 7 and the filter housing 200 are tightly fitted, as well as the radial sealing effect of the annular thin-walled structure 73 thereof and the inner wall of the filter housing 200 is enhanced.

The present utility model also proposes a hydraulic filter 1000, referring to fig. 1 to 7, comprising a housing 200 and the hydraulic filter element 100 of any of the above embodiments, wherein the housing 200 has a hydraulic oil inlet 200a and a hydraulic oil outlet 200b.

Referring to fig. 2, the hydraulic oil inlet 200a is disposed corresponding to the first opening 3a, the hydraulic oil outlet 200b is disposed corresponding to the second opening 4a,

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A hydraulic cartridge, comprising:

An annular filter medium (1), wherein the annular filter medium (1) is provided with a central cavity (1 a) which is set around the central axis of the annular filter medium, and a central framework (2) is arranged in the central cavity (1 a);

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) having a first opening (3 a) and a second opening (4 a) respectively communicating with the central cavity (1 a), and

A bypass valve (5) provided at a first opening (3 a) of the first end cap (3);

wherein, be equipped with positioning seat (21) on central skeleton (2) for connect bypass valve (5).

2. A hydraulic cartridge as claimed in claim 1, wherein 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. A hydraulic cartridge as claimed in claim 2, wherein the valve body (51) is provided with a prefilter medium (53) to filter the hydraulic oil passing through the first opening (3 a) when the valve body (51) is open.

4. A hydraulic cartridge as claimed in claim 3, wherein the positioning seat (21) and the valve body (51) have an axially cooperating positioning portion (211) and a cooperating portion (511), respectively, for axial movement of the valve body (51) relative to the positioning seat (21).

5. A hydraulic cartridge as claimed in claim 3, wherein said valve body (51) is provided with small holes (51 a) for the passage of hydraulic oil when said prefilter medium (53) is blocked.

6. The hydraulic cartridge of claim 2, further comprising a first end disc (6), said first end disc (6) being provided in said first opening (3 a) and being clamped to said central skeleton (2).

7. A hydraulic cartridge as claimed in claim 6, wherein said first end disc (6) has a through hole (6 a) communicating with said central cavity (1 a), said valve body (51) being movably arranged in said through hole (6 a) to control said through hole (6 a).

8. The hydraulic filter cartridge of claim 6, further comprising a second end plate (7), wherein the second end plate (7) is disposed in the second opening (4 a) and is clamped to the central frame (2) for sealing connection with the filter housing (201).

9. A hydraulic cartridge as claimed in claim 8, wherein the first end disc (6) is provided with a resilient member (61) for abutment against the filter housing (201) to provide a close fit of the second end disc (7) and the filter housing.

10. A hydraulic filter, comprising:

A housing (200) having a hydraulic oil inlet (200 a) and a hydraulic oil outlet (200 b), and

A hydraulic cartridge according to any one of claims 1 to 9.