Return oil suction filter of movable external pipeline

Abstract

The utility model belongs to the field of filters, and relates to an oil suction and return filter of a movable external pipeline, which comprises a filter shell, a first filter element, a second filter element, a second filter element, a first oil suction pipe, a second oil suction pipe, a second oil suction pipe and a second oil suction pipe, and is characterized in that the filter shell is provided with a medium channel with two communicated ends, a liquid outlet and a first filter element are formed on the filter shell, and a plurality of first filter holes are formed in the side edge of the first filter element at intervals; the first filter element is positioned in the medium channel; the liquid inlet end of the first filter element is connected to the inner top of the front end cover; a plurality of second filter holes are formed in the side edge of the second filter element at intervals; the liquid inlet end of the second filter element is connected to the inner top of the front end cover. After the structure is adopted, the oil filter has the beneficial effects that dirty oil flowing back from a hydraulic system loop enters the second filter element through the second liquid inlet; oil sucked by the oil pump enters the first filter element through the first liquid inlet and is supplied to the hydraulic oil supplementing pump from the liquid outlet after being filtered, two loops are combined, and full-flow type filtering through the filter element is achieved through the design of a two-inlet and one-outlet structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, in particular to a removable external pipeline oil suction filter. Background Art

[0002] The return oil filter is mainly installed in the oil tank pipeline system. It uses mineral oil or synthetic oil as the medium and is a filtering device that filters it.

[0003] In hydraulic systems, rapid changes in flow direction or cessation of flow can cause hydraulic shock. Therefore, filters must be installed between these vulnerable components to eliminate these factors. In such cases, filters that effectively filter in both flow directions are essential, especially when protecting expensive hydraulic cylinders.

[0004] Traditional oil return filters can only be used as suction or return oil filter elements, and their filtering position is fixed, for example, installed only at the oil tank inlet. If they are moved, the connecting pipes need to be disassembled. During this process, the sealing of the entire filter module will be damaged, causing oil leakage. Airborne impurities and moisture will enter the filter module, causing the filter element life to be rapidly consumed, greatly reducing the filtering effect, and further damaging the components protected by the filter module, resulting in unnecessary losses. Therefore, improvements are necessary. Utility Model Content

[0005] In order to solve the above-mentioned problems of the prior art, the utility model provides a removable external pipeline oil suction return filter, which solves the problem that the oil in the existing oil suction return filter can only be installed at the oil tank inlet and filter, saves space, and makes the system layout more flexible; it can be used for oil suction and oil return, reducing the selection cost and installation cost.

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

[0007] As one aspect of the present invention, a removable external pipeline return oil filter is provided, comprising: a filter housing having a media channel intersecting at both ends; a front end cover detachably connected to one end of the filter housing; and a rear end cover detachably connected to the other end of the filter housing; a liquid outlet formed on the filter housing, the liquid outlet being in communication with the media channel;

[0008] The front end cover is provided with a first liquid inlet and a second liquid inlet. When the front end cover is connected to the filter housing, the first liquid inlet and the second liquid inlet are respectively communicated with the medium channel;

[0009] A first filter element, wherein a plurality of first filter holes are provided at intervals on the side of the first filter element; the first filter element is located in the medium channel; the liquid inlet end of the first filter element is connected to the inner top of the front end cover; the liquid inlet end of the first filter element is in communication with the first liquid inlet; the bottom of the first filter element is connected to the inner bottom of the rear end cover via a first elastic member;

[0010] The second filter element has a plurality of second filter holes spaced apart on its side; the second filter element is located in the medium channel; the liquid inlet end of the second filter element is connected to the inner top of the front end cover; the liquid inlet end of the second filter element is in communication with the second liquid inlet; the second filter element is located in the first filter element.

[0011] Optionally, a first bypass valve is provided at the bottom of the first filter element.

[0012] Optionally, a second bypass valve is connected between the bottom of the second filter element and the inner bottom of the first filter element.

[0013] Optionally, a threaded hole is formed on the end surface of the front end cover.

[0014] Optionally, a magnetic element is further included, which is connected to the second filter element.

[0015] Optionally, the first bypass valve includes a first bypass valve plate connected to the bottom of the first filter element, and a first liquid hole is provided in the middle of the first bypass valve plate; a first valve stem is connected to the first bypass valve plate through a second elastic member, and the first valve stem has a rod portion and a cap portion connected to the rod portion; under normal conditions, the cap portion of the first valve stem blocks the first liquid hole under the action of the second elastic member.

[0016] Optionally, the rod portion of the first valve stem passes through the first liquid hole, and then one end of the second elastic member is connected to the rod portion of the first valve stem, and the other end of the second elastic member abuts against the first bypass valve plate, so that the cap portion of the first valve stem blocks the first liquid hole under the action of the second elastic member.

[0017] Optionally, the second bypass valve includes a second bypass valve seat connected to the bottom of the second filter element, and the second bypass valve seat is provided with a second liquid hole and a third liquid hole, and the second liquid hole and the third liquid hole are communicated with each other; a piston and a third elastic member are provided in the second bypass valve seat, one end of the third elastic member is connected to the piston, and the other end of the third elastic member is connected to the second bypass valve seat; under normal circumstances, the piston blocks the second liquid hole under the action of the third elastic member.

[0018] Optionally, a bypass connector is further included, through which the first bypass valve and the second bypass valve are connected; the bypass connector includes a bypass filter element connected to the first filter element or the first bypass valve plate, and a plurality of third filter holes are provided at intervals on the side of the bypass filter element; the bypass filter element has the first bypass valve cover disposed therein, the other end of the bypass filter element is connected to a support, the second bypass valve seat is connected to the support, and the third liquid hole is communicated with the bypass filter element.

[0019] The beneficial effects of the movable external pipeline return oil filter of the utility model are specifically embodied in that: the dirty oil flowing back from the hydraulic system circuit enters the second filter element through the second liquid inlet; the oil sucked in by the oil pump enters the first filter element through the first liquid inlet, and is supplied to the hydraulic oil replenishment pump from the liquid outlet after filtration, so that the two circuits are merged. The design of the two-inlet and one-outlet structure plays a role in full-flow filtration through the filter element; the flow is diverted through the crescent hole, the number of oil pipe interfaces is reduced, and the probability of oil leakage is reduced; the external lifting parts are connected through the flange surfaces of the front end cover and the rear end cover, which is convenient for inspection and replacement of the filter and periodic cleaning of the inside of the oil tank, abandoning the traditional top-mounted installation of the oil tank. Through the movable method, the installation space is no longer limited, the working oil circuit is clean, and the pipeline can be ensured to be simple and easy to install, which is convenient for maintenance and repair. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0021] Figure 1 This is a structural perspective diagram of the movable external pipeline oil return filter of the utility model;

[0022] Figure 2 This is a left side view of the structure of the movable external pipeline oil return filter of the utility model;

[0023] Figure 3 This is a structural cross-sectional view of the movable external pipeline oil suction return filter of the utility model. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the present invention more clearly apparent, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0025] An embodiment of the present application is a removable external pipeline oil suction filter, such as Figure 1-Figure 3 As shown, it comprises: a filter housing 1, the filter housing 1 having a medium channel 11 intersecting at both ends, a front end cover 2 detachably connected to one end of the filter housing 1, and a rear end cover 3 detachably connected to the other end of the filter housing 1; the front end cover 2 and the rear end cover 3 block the medium channel 11; a liquid outlet 12 is formed on the filter housing 1, and the liquid outlet 12 is connected to the medium channel 11;

[0026] The front end cover 2 is provided with a first liquid inlet 21 and a second liquid inlet 22. When the front end cover 2 is connected to the filter housing 1, the first liquid inlet 21 and the second liquid inlet 22 are respectively communicated with the medium channel 11; the first liquid inlet 21 is a plurality of crescent holes arranged at intervals; the second liquid inlet 22 is a circular hole, and the plurality of crescent holes are arranged around the circular hole;

[0027] A first filter element 4 has a plurality of first filter holes spaced apart on its side; the first filter element 4 is located in the medium channel 11; the liquid inlet end of the first filter element 4 is connected to the inner top of the front cover 2; the liquid inlet end of the first filter element 4 is in communication with the first liquid inlet 21; the bottom of the first filter element 4 is connected to the inner bottom of the rear cover 3 via a first elastic member 5, so that the first filter element 4 is more stable in the medium channel 11; as an example, the first elastic member 5 is a spring; a first bypass valve 6 is provided at the bottom of the first filter element 4, which is opened when the first filter element 4 is blocked;

[0028] The second filter element 7, a plurality of second filter holes are provided at intervals on the side of the second filter element 7; the second filter element 7 is located in the medium channel 11; the liquid inlet end of the second filter element 7 is connected to the inner top of the front end cover 2; the liquid inlet end of the second filter element 7 is communicated with the second liquid inlet 22; the second filter element 7 is located in the first filter element 4; a second bypass valve 8 is connected between the bottom of the second filter element 7 and the inner bottom of the first filter element 4, and when the second filter element 7 is blocked, the second bypass valve 8 is opened; it should be noted that the structures and filtration processes of the first filter element 4 and the second filter element 7 are all prior art and will not be described here.

[0029] In this embodiment, the dirty oil flowing back from the hydraulic system circuit enters the second filter element 7 through the second liquid inlet 22; the oil sucked in by the oil pump enters the first filter element 4 through the first liquid inlet 21, and is supplied to the hydraulic oil replenishment pump from the liquid outlet 12 after filtration, so that the two circuits are merged. The design of the two-inlet and one-outlet structure plays a role in full-flow filtration through the filter element; the flow is diverted through the crescent hole, the number of oil pipe interfaces is reduced, and the probability of oil leakage is reduced; the external lifting parts are connected through the flange surfaces of the front end cover 2 and the rear end cover 3, which is convenient for the inspection and replacement of the filter and the periodic cleaning of the internal oil tank, abandoning the traditional top-mounted installation of the oil tank. Through a movable manner, the installation space is no longer limited, the working oil circuit is clean, and the pipeline can be ensured to be simple and easy to install, which is convenient for maintenance and repair, and ensures that the pipeline and the sealing ring are reliable and stable. Research and improvement have been carried out for the purpose of

[0030] In one embodiment, if Figure 1-Figure 2 As shown, a threaded hole 9 is formed on the end surface of the front cover 2, and the threaded hole 9 is used to connect a hanging part to facilitate the inspection, installation or replacement of the filter.

[0031] In one embodiment, if Figure 3 As shown, it also includes a magnetic member 13, which is connected to the second filter element 7 to absorb metal impurities in the medium. The magnetic member 13 is a magnetic steel.

[0032] In one embodiment, if Figure 3 As shown, the first bypass valve 6 includes a first bypass valve plate 61 connected to the bottom of the first filter element 4, and a first liquid hole 62 is provided in the middle of the first bypass valve plate 61; a first valve stem 64 is connected to the first bypass valve plate 61 through a second elastic member 63, and the first valve stem 64 has a rod portion and a cap portion connected to the rod portion; under normal conditions, the cap portion of the first valve stem 64 blocks the first liquid hole 62 under the action of the second elastic member 63; the second elastic member 63 is a spring; the rod portion of the first valve stem 64 passes through the first liquid hole 62, and then the One end of the second elastic member 63 is connected to the rod portion of the first valve stem 64, and the other end of the second elastic member 63 is in contact with the first bypass valve plate 61, so that the cap portion of the first valve stem 64 blocks the first liquid hole 62 under the action of the second elastic member 63; when starting with cold oil, or when the filter cannot work normally due to excessive pressure difference due to other factors such as low system oil temperature, or when the filter element is blocked by contaminants, the second elastic member 63 is squeezed, so that the cap portion of the first valve stem 64 is separated from the first liquid hole 62, and the first bypass valve 6 automatically opens.

[0033] In one embodiment, if Figure 3As shown, the second bypass valve 8 includes a second bypass valve seat 81 connected to the bottom of the second filter element 7, and a second liquid hole 82 and a third liquid hole 85 are provided on the second bypass valve seat 81, and the second liquid hole 82 and the third liquid hole 85 are communicated with each other; a piston 83 and a third elastic member 84 are provided in the second bypass valve seat 81, one end of the third elastic member 84 is connected to the piston 83, and the other end of the third elastic member 84 is connected to the second bypass valve seat 81; under normal circumstances, the piston 83 blocks the second liquid hole 82 under the action of the third elastic member 84; when starting with cold oil, or when the filter cannot work normally due to excessive pressure difference due to other factors such as low system oil temperature, or when the filter is blocked by contaminants, the third elastic member 84 is squeezed to separate the piston 83 from the second liquid hole 82, and the second bypass valve 8 automatically opens.

[0034] In one embodiment, if Figure 3 As shown, it also includes a bypass connector 10, and the first bypass valve 6 and the second bypass valve 8 are connected by the bypass connector 10; the bypass connector 10 includes a bypass filter element 101 connected to the first filter element 4 or the first bypass valve plate 61, and a plurality of third filter holes are provided at intervals on the side of the bypass filter element 101; the bypass filter element 101 covers the first bypass valve 6 inside, and the other end of the bypass filter element 101 is connected to the support 102, and the second bypass valve seat 81 is connected to the support 102, and the third liquid hole 85 is communicated with the bypass filter element 101. When the second bypass valve 8 and the first bypass valve 6 are in the open state, the medium enters the third liquid hole 85 from the second liquid hole 82, then enters the bypass filter element 101, and enters the medium channel 11 through the first liquid hole 62.

[0035] When the first bypass valve 6 is in the open state, the medium enters the bypass filter element 101 from the first filter element 4 and enters the medium channel 11 through the first liquid hole 62 .

[0036] In this embodiment, to prevent the return oil resistance from being too high>2 bar, the second bypass valve 8 is opened, and the dirty oil containing impurities is coarsely filtered through the bypass filter element 101, filtered through the first filter element 4, and then continues to supply the hydraulic oil replenishment pump from the liquid outlet 11; to prevent the oil suction resistance from being too high, the first bypass valve 6 is designed, and a layer of filtration is added to the hydraulic return oil filter element to provide early oil inlet filtration protection for the working pump, thereby reducing the wear of impurities on the working pump and related hydraulic components.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0039] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0042] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc. should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model in specific circumstances.

[0043] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A removable external pipeline oil return filter, characterized in that: It includes: A filter housing having a media channel interpenetrating at both ends, a front end cover detachably connected to one end of the filter housing, and a rear end cover detachably connected to the other end of the filter housing; a liquid outlet formed on the filter housing, the liquid outlet being connected to the media channel; The front end cover is provided with a first liquid inlet and a second liquid inlet. When the front end cover is connected to the filter housing, the first liquid inlet and the second liquid inlet are respectively communicated with the medium channel; A first filter element, wherein a plurality of first filter holes are provided at intervals on the side of the first filter element; the first filter element is located in the medium channel; the liquid inlet end of the first filter element is connected to the inner top of the front end cover; the liquid inlet end of the first filter element is in communication with the first liquid inlet; the bottom of the first filter element is connected to the inner bottom of the rear end cover via a first elastic member; The second filter element has a plurality of second filter holes spaced apart on its side; the second filter element is located in the medium channel; the liquid inlet end of the second filter element is connected to the inner top of the front end cover; the liquid inlet end of the second filter element is in communication with the second liquid inlet; the second filter element is located in the first filter element.

2. The removable external pipeline oil return filter according to claim 1, characterized in that: A first bypass valve is provided at the bottom of the first filter element.

3. The removable external pipeline oil return filter according to claim 2, characterized in that: A second bypass valve is connected between the bottom of the second filter element and the inner bottom of the first filter element.

4. The removable external pipeline oil return filter according to claim 1, characterized in that: A threaded hole is formed on the end surface of the front end cover.

5. The removable external pipeline oil return filter according to claim 1, characterized in that: It also includes a magnetic attraction component, which is connected to the second filter element.

6. The removable external pipeline oil return filter according to claim 3, characterized in that: The first bypass valve includes a first bypass valve plate connected to the bottom of the first filter element, and a first liquid hole is provided in the middle of the first bypass valve plate; a first valve stem is connected to the first bypass valve plate through a second elastic member, and the first valve stem has a rod portion and a cap portion connected to the rod portion; under normal conditions, the cap portion of the first valve stem blocks the first liquid hole under the action of the second elastic member.

7. The removable external pipeline oil return filter according to claim 6, characterized in that: The rod portion of the first valve stem passes through the first liquid hole, and then one end of the second elastic member is connected to the rod portion of the first valve stem, and the other end of the second elastic member abuts against the first bypass valve plate, so that the cap portion of the first valve stem blocks the first liquid hole under the action of the second elastic member.

8. The removable external pipeline oil return filter according to claim 7, characterized in that: The second bypass valve includes a second bypass valve seat connected to the bottom of the second filter element, and a second liquid hole and a third liquid hole are provided on the second bypass valve seat, and the second liquid hole and the third liquid hole are communicated with each other; a piston and a third elastic member are provided in the second bypass valve seat, one end of the third elastic member is connected to the piston, and the other end of the third elastic member is connected to the second bypass valve seat; under normal conditions, the piston blocks the second liquid hole under the action of the third elastic member.

9. The removable external pipeline oil return filter according to claim 8, characterized in that: It also includes a bypass connector, through which the first bypass valve and the second bypass valve are connected; the bypass connector includes a bypass filter element connected to the first filter element or the first bypass valve plate, and a plurality of third filter holes are provided at intervals on the side of the bypass filter element; the bypass filter element has the first bypass valve cover arranged inside, the other end of the bypass filter element is connected to a support, the second bypass valve seat is connected to the support, and the third liquid hole is communicated with the bypass filter element.

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