Oil suction and return integrated filter and hydraulic system

Abstract

The utility model discloses an oil suction and return integrated filter, which relates to the technical field of filters and mainly comprises a base, a shell and a filter element component, the shell is mounted on the base, and the filter element component is mounted on the base and positioned in the shell; wherein an oil suction inlet, an oil return inlet and a pump connecting inlet are formed in the base, the filter element assembly comprises an oil suction filter element and an oil return filter element, the oil suction inlet is communicated with the upstream of the oil suction filter element, the oil suction inlet is further communicated with the pump connecting inlet through a main bypass valve, and the downstream of the oil suction filter element is communicated with the pump connecting inlet; the oil return inlet is communicated with the upstream of the oil return filter element, the oil return inlet is communicated with the upstream of the oil suction filter element through the oil return bypass valve, and the downstream of the oil return filter element is communicated with the pump connecting inlet. The utility model further provides a hydraulic system which comprises the oil suction and return integrated filter. According to the hydraulic pump, oil liquid can be kept clean, the pump front pressure of the hydraulic pump can be increased, and the hydraulic pump can work stably.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to an oil suction and return integrated filter and a hydraulic system. Background Art

[0002] At present, in hydraulic systems, hydraulic oil is usually provided to hydraulic actuators (hydraulic motors, hydraulic cylinders, etc.) through hydraulic pumps, and an oil suction filter is installed in front of the hydraulic pump to filter out large particles of impurities in the oil and protect the operation of the hydraulic pump. A return oil filter is installed after the hydraulic actuator. It has relatively high accuracy and is used to filter out impurities in the oil to ensure the overall cleanliness of the oil.

[0003] Commonly used filtering devices in existing hydraulic systems, such as Figure 1 and Figure 2 As shown, it mainly includes the oil suction filter element F1, the oil suction bypass valve V1, the oil return filter element F2, the oil return bypass valve V2 and the bypass filter element B1; the bypass valve of the hydraulic filter is integrated on the filter element. When the bypass valve is opened, the oil enters the hydraulic pump through the bypass filter element B1. The bypass filter element B1 has a small filtration area and a large mesh. At this time, there are the following problems:

[0004] 1. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 is open and the oil return bypass valve V2 is closed, and there is a bypass filter element B1 in front of the filter outlet, the pressure drop will still be high, which is not conducive to the pump's oil suction work. Figure 1 As shown;

[0005] 2. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 is closed and the oil return bypass valve V2 is opened, and there is a bypass filter element B1 in front of the filter outlet, the pressure drop will still be high, and the filtration accuracy of the bypass filter element B1 is low, which is not conducive to the oil suction work of the pump. Figure 1 As shown;

[0006] 3. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 and the oil return bypass valve V2 are opened at the same time, and there is a bypass filter element B1 in front of the filter outlet, the pressure drop will still be high, and the filtration accuracy of the bypass filter element B1 is low, which is not conducive to the oil suction work of the pump. Figure 1 As shown;

[0007] 4. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 is opened and the oil return bypass valve V2 is closed, the pump's oil suction work can be temporarily guaranteed. Figure 2 As shown;

[0008] 5. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 is closed and the oil return bypass valve V2 is opened, the pump's oil suction work can be temporarily guaranteed. However, the return oil filter element has unfiltered hydraulic oil directly entering the system, which is easy to cause the oil cleanliness to decrease. Figure 2 As shown;

[0009] 6. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the oil suction bypass valve V1 and the oil return bypass valve V2 are opened at the same time, the pump's oil suction work can be temporarily guaranteed. However, the return oil filter element has unfiltered hydraulic oil directly entering the system, which is easy to cause the oil cleanliness to decrease. Figure 2 shown.

[0010] Therefore, it is urgent to provide a new oil-return integrated filter to solve the above-mentioned problems existing in the prior art. Utility Model Content

[0011] The purpose of the utility model is to provide an integrated oil suction and return filter and a hydraulic system to solve the problems existing in the above-mentioned prior art, which can not only keep the oil clean, but also increase the pressure before the hydraulic pump so that the hydraulic pump can work smoothly.

[0012] To achieve the above purpose, the utility model provides the following solutions:

[0013] The utility model provides an integrated oil suction and return filter, comprising a base, a shell and a filter element assembly, the shell being mounted on the base, the filter element assembly being mounted on the base and being located in the shell; wherein an oil suction inlet, an oil return inlet and a pump inlet are provided on the base, the filter element assembly comprising an oil suction filter element and an oil return filter element, the oil suction inlet being communicated with the upstream of the oil suction filter element, and the oil suction inlet is also communicated with the pump inlet through a total bypass valve, and the downstream of the oil suction filter element is communicated with the pump inlet; the oil return inlet is communicated with the upstream of the oil return filter element, and the oil return inlet is communicated with the upstream of the oil suction filter element through a return oil bypass valve, and the downstream of the oil return filter element is communicated with the pump inlet.

[0014] Preferably, the filter element assembly further comprises an upper end cover and a lower end cover arranged opposite to each other, the oil suction filter element and the oil return filter element are both arranged between the upper end cover and the lower end cover, and the oil suction filter element and the oil return filter element are both annular filter elements, the oil suction filter element and the oil return filter element are coaxially arranged, and the oil suction filter element is located on the outside of the oil return filter element;

[0015] Among them, an oil suction channel is formed between the outer side of the oil suction filter element and the shell, and the oil suction channel is connected to the oil suction inlet; an oil return channel is formed on the inner side of the oil return filter element, and the oil return channel is connected to the oil return inlet, and an intermediate channel is formed between the oil return filter element and the oil suction filter element, and the oil return channel is connected to the intermediate channel through the oil return filter element, and the intermediate channel is also connected to the pump inlet, and the end of the oil return channel away from the oil return inlet is connected to the oil suction channel through the oil return bypass valve, and the oil return bypass valve is installed on the lower end cover.

[0016] Preferably, the oil absorption filter element comprises an oil absorption filter layer and an oil absorption frame; wherein the oil absorption frame is an annular frame, and the oil absorption filter layer is an annular filter layer, and is sleeved on one side of the oil absorption frame close to the oil absorption channel;

[0017] The oil return filter element comprises an oil return filter layer and an oil return frame; wherein the oil return frame is an annular frame, and the oil return filter layer is an annular filter layer and is attached to a side of the oil return frame close to the oil return channel.

[0018] Preferably, both ends of the oil suction filter element are respectively bonded and fixed to the upper end cover and the lower end cover by sealant, and both ends of the oil return filter element are respectively bonded and fixed to the upper end cover and the lower end cover by sealant, and the oil return bypass valve is mechanically fixed to the lower end cover.

[0019] Preferably, the oil return inlet is arranged in the middle of the base, and an oil supply channel is also arranged on the base, the oil supply channel is arranged around the oil return inlet, the oil suction inlet is arranged on one side of the oil supply channel and is connected with the oil supply channel through the main bypass valve, and the pump inlet is arranged on the other side of the oil supply channel and is connected with the oil supply channel.

[0020] Preferably, a first annular boss is provided in the middle portion of the upper end cover, and the return oil inlet is connected to the return oil channel through the first annular boss; a second annular boss is provided at the edge of the upper end cover, and the second annular boss is coaxially arranged with the first annular boss, and the oil supply channel is connected to the middle channel through the second annular boss.

[0021] Preferably, the first annular boss and the base are sealed via a second sealing ring, and the second annular boss and the base are sealed via a third sealing ring.

[0022] Preferably, the shell and the base are sealed and connected via a first sealing ring.

[0023] Preferably, it also includes a pressure alarm, which is used to detect the oil pressure in the integrated oil suction filter and to alarm when the pressure is abnormal.

[0024] The utility model also provides a hydraulic system, comprising the above-mentioned integrated oil suction and return filter.

[0025] Compared with the prior art, the utility model has achieved the following technical effects:

[0026] In the utility model, the oil suction inlet is connected with the pump inlet through the main bypass valve, and the return oil inlet is connected with the upstream of the oil suction filter element through the return oil bypass valve, so that the oil suction filter element also serves as the bypass filter element; when the pressure drop of the return oil filter element reaches a certain value, the return oil bypass valve opens, and the bypass oil passes through the oil suction filter element first, which can keep the oil clean and increase the pressure before the hydraulic pump, so that the hydraulic pump can work smoothly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a first schematic diagram of the working principle of the filter in the prior art;

[0029] Figure 2 The second schematic diagram of the working principle of the filter in the prior art (without bypass filter element);

[0030] Figure 3 This is a schematic diagram of the working principle of the integrated oil return filter in the embodiment of the utility model;

[0031] Figure 4 This is a schematic diagram of the structure of the integrated oil return filter in the embodiment of the utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the filter element assembly in the embodiment of the utility model;

[0033] Figure 6 This is a schematic diagram of the upper end cover of the filter element assembly in the embodiment of the utility model;

[0034] Figure 7 This is a schematic diagram of the lower end cover of the filter element assembly in the embodiment of the utility model;

[0035] Figure 8 It is a schematic diagram of the overall structure of the oil suction and return integrated filter in the embodiment of the utility model.

[0036] In the figure: F1-oil suction filter element, F2-oil return filter element, V1-oil suction bypass valve, V2-oil return bypass valve, V3-main bypass valve, B1-bypass filter element, 1-base, 3-first sealing ring, 4-housing, 5-filter element assembly, 51-second sealing ring, 52-third sealing ring, 53-upper end cover, 54-lower end cover, 56-oil suction filter layer, 57-oil suction skeleton, 58-oil return skeleton, 59-oil return filter layer, 6-pressure alarm. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] The purpose of the utility model is to provide an integrated oil suction and return filter and a hydraulic system to solve the problems existing in the above-mentioned prior art, which can not only keep the oil clean, but also increase the pressure before the hydraulic pump so that the hydraulic pump can work smoothly.

[0039] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0040] Embodiment 1

[0041] like Figure 3-Figure 8 As shown, in this embodiment, an integrated oil suction and return filter is provided, which mainly includes a base 1, a shell 4 and a filter element assembly 5, wherein the shell 4 is installed on the base 1, and the filter element assembly 5 is sleeved on the base 1 and is located in the shell 4; wherein, an oil suction inlet, an oil return inlet and a pump inlet are provided on the base 1, wherein the oil suction inlet is used to suck oil from the oil accumulation, the oil return inlet is used to return oil from the hydraulic actuator, and the pump inlet is used to connect with the hydraulic pump to realize oil supply. In this embodiment, the filter element assembly 5 mainly includes an oil suction filter element F1 and an oil return filter element F2. The oil suction inlet is connected to the upstream of the oil suction filter element F1, and the oil suction inlet is also connected to the pump inlet through the main bypass valve V3, and the downstream of the oil suction filter element F1 is connected to the pump inlet; the return oil inlet is connected to the upstream of the return oil filter element F2, and the return oil inlet is connected to the upstream of the oil suction filter element F1 through the return oil bypass valve V2, and the downstream of the return oil filter element F2 is connected to the pump inlet.

[0042] In this embodiment, the oil suction inlet is connected with the pump inlet through the main bypass valve V3, and the return oil inlet is connected with the upstream of the oil suction filter F1 through the return oil bypass valve V2, so that the oil suction filter F1 also serves as the bypass filter function; when the pressure drop of the return oil filter F2 reaches a certain value, the return oil bypass valve V2 opens, and the bypass oil passes through the oil suction filter F1 first, which can not only keep the oil clean, but also increase the pressure before the hydraulic pump, so that the hydraulic pump can work smoothly.

[0043] In this embodiment, if Figure 4-Figure 7 As shown, the filter element assembly 5 further includes an upper end cover 53 and a lower end cover 54 which are arranged opposite to each other, wherein the upper end cover 53 is located above the lower end cover 54, wherein “above” refers to Figure 3 and Figure 4 Furthermore, the oil suction filter element F1 and the oil return filter element F2 are both vertically arranged between the upper end cover 53 and the lower end cover 54, wherein the oil suction filter element F1 and the oil return filter element F2 are both annular filter elements, the oil suction filter element F1 and the oil return filter element F2 are coaxially arranged, and the oil suction filter element F1 is located on the outside of the oil return filter element F2.

[0044] In this embodiment, an oil suction channel is formed between the outer side of the oil suction filter element F1 and the shell 4, and the oil suction channel is connected to the oil suction inlet. The side of the oil suction filter element F1 close to the oil suction channel is the upstream, and the other side is the downstream; the inner side of the return oil filter element F2 is the upstream, forming an oil return channel, and the other side is the downstream. The return oil channel is connected to the return oil inlet, and an intermediate channel is formed between the return oil filter element F2 and the oil suction filter element F1. The return oil channel is connected to the intermediate channel through the return oil filter element F2. The intermediate channel is the downstream of the oil suction filter element F1 and the return oil filter element F2, and the intermediate channel is also connected to the pump inlet; the end of the return oil channel away from the return oil inlet is connected to the oil suction channel through the return oil bypass valve V2, and the return oil bypass valve V2 is installed on the lower end cover 54.

[0045] Furthermore, it should be noted that the “ring” mentioned in this embodiment does not only refer to the traditional circular ring shape, but also a ring structure with a regular polygonal cross section can be selected as required.

[0046] In this embodiment, the structures of the oil suction filter element F1 and the oil return filter element F2 are similar; specifically, the oil suction filter element F1 includes an oil suction filter layer 56 and an oil suction skeleton 57, the oil suction skeleton 57 is an annular skeleton, the oil suction filter layer 56 is an annular filter layer matching the oil suction skeleton 57, and is sleeved on the side of the oil suction skeleton 57 close to the oil suction channel, the incoming oil in the oil suction channel is first filtered by the oil suction filter layer 56, and then passes through the oil suction skeleton 57, the oil suction skeleton 57 is provided with a through hole for oil liquid to pass through, during the filtering process, the oil will exert pressure on the oil suction filter layer 56 toward the oil suction skeleton 57, and the oil suction skeleton 57 can It can effectively support the oil absorption filter layer 56; the return oil filter element F2 includes a return oil filter layer 59 and a return oil skeleton 58, the return oil skeleton 58 is an annular skeleton, the return oil filter layer 59 is an annular filter layer matching the return oil skeleton 58, and is attached to the side of the return oil skeleton 58 close to the return oil channel, the return oil in the return oil channel is first filtered by the return oil filter layer 59, and then passes through the return oil skeleton 58, the return oil skeleton 58 is provided with a through hole for oil to pass through, during the filtering process, the oil will exert pressure on the return oil filter layer 59 toward the return oil skeleton 58, and the return oil skeleton 58 can effectively support the return oil filter layer 59.

[0047] Among them, the connection method of the oil absorption filter layer 56, the oil absorption frame 57, the oil return filter layer 59 and the oil return frame 58 with the upper end cover 53 and the lower end cover 54 can be selected according to specific work needs, and the fixing method of the oil return bypass valve V2 can also be selected according to specific work needs, such as adhesive fixing or mechanical fixing. As a preferred embodiment, in this embodiment, the two ends of the oil absorption filter element F1 are respectively bonded and fixed to the upper end cover 53 and the lower end cover 54 by sealant, the two ends of the oil return filter element F2 are respectively bonded and fixed to the upper end cover 53 and the lower end cover 54 by sealant, and the oil return bypass valve V2 is mechanically fixed to the lower end cover 54.

[0048] In this embodiment, if Figure 4 As shown, the oil return inlet is arranged in the middle of the base 1, and an oil supply channel is also arranged on the base 1, and the oil supply channel is arranged around the oil return inlet, the oil suction inlet is arranged on one side of the oil supply channel, and is communicated with the oil supply channel through the total bypass valve V3, and the pump inlet is arranged on the other side of the oil supply channel and is communicated with the oil supply channel; wherein, the total bypass valve V3 is preferably mechanically connected to the base 1.

[0049] In this embodiment, if Figure 5As shown, a first annular boss is provided in the middle of the upper end cover 53, and the return oil inlet is connected to the return oil channel through the first annular boss; a second annular boss is provided at the edge of the upper end cover 53, and the second annular boss is coaxially arranged with the first annular boss, and a connecting channel is formed between the second annular boss and the first annular boss, and the oil supply channel is connected to the intermediate channel through the connecting channel.

[0050] In this embodiment, the first annular boss is sealed to the base 1 via a second sealing ring 51 , and the second annular boss is sealed to the base 1 via a third sealing ring 52 .

[0051] In this embodiment, the housing 4 and the base 1 are preferably threadedly connected, and the two are sealed by a first sealing ring 3 .

[0052] The working principle of the integrated oil return filter in this embodiment is as follows:

[0053] 1. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the main bypass valve V3 is opened and the return oil bypass valve V2 is closed, the oil suction work of the hydraulic pump can be temporarily guaranteed. Figure 3 As shown;

[0054] 2. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the main bypass valve V3 is closed and the return oil bypass valve V2 is opened, the unfiltered oil through the return oil bypass valve V2 is filtered by the oil suction filter element F1 and then flows out, which can temporarily ensure the oil suction work of the hydraulic pump. Figure 3 As shown;

[0055] 3. When the oil temperature is low or during cold start, the filter pressure drop is large. At this time, if the main bypass valve V3 and the return oil bypass valve V2 are opened at the same time, the unfiltered oil passing through the return oil bypass valve V2 is filtered by the oil suction filter F1 and then enters the hydraulic pump, and the rest enters the hydraulic pump through the main bypass valve V3, which can temporarily ensure the oil suction work of the hydraulic pump. Figure 3 shown.

[0056] In this embodiment, the oil suction and return integrated filter also includes a pressure alarm 6, which is used to detect the oil pressure in the oil suction and return integrated filter and alarm when the pressure is abnormal; wherein, the pressure abnormality means that the oil pressure is lower than the set value or exceeds the set value. When the oil pressure is abnormal, it is judged that the oil suction filter element F1 and / or the oil return filter element F2 are blocked, and the pressure alarm 6 alarms to remind the user to replace them in time. It should be noted that the pressure alarm 6 mainly includes a pressure detection module and an alarm. The pressure detection module is used to detect the oil pressure. When the oil pressure is abnormal, the alarm is turned on and an alarm is sounded; this is a mature prior art in this field and will not be described in detail in this embodiment.

[0057] In the present embodiment, it is also necessary to explain that the setting position of the pressure detection module of the pressure alarm 6 can be selected according to specific work needs; for example, it can be set in the oil suction channel and / or the oil return channel, and when the pressure of the oil in the oil suction channel and / or the oil return channel exceeds the set value, it is judged that the oil suction filter F1 and / or the oil return filter F2 are blocked; or, the pressure detection module can be set at the pump inlet, and when the oil pressure at the pump inlet is too small and lower than the set value, it is judged that blockage occurs.

[0058] Further, it needs to be explained that, in the present embodiment, when the integrated oil suction and return filter is working normally, that is, when the filter element assembly 5 can meet the filtering demand, the return oil bypass valve V2 and the main bypass valve V3 are closed; when the filter element assembly 5 cannot meet the filtering demand due to blockage or other reasons, the pressure alarm 6 alarms to remind the user to replace the filter element assembly 5 in time; when the user does not replace the filter element assembly 5, in order to give priority to meeting the needs of the hydraulic pump and the operation of the system, when the oil pressure in the return oil channel and / or the oil suction channel reaches the set value, the return oil bypass valve V2 and / or the main bypass valve V3 automatically opens to temporarily ensure the oil suction work of the hydraulic pump.

[0059] Embodiment 2

[0060] This embodiment provides a hydraulic system, including the integrated oil return filter mentioned in the first embodiment.

[0061] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. An integrated oil return filter, characterized in that: It comprises a base, a shell and a filter element assembly, wherein the shell is mounted on the base, and the filter element assembly is mounted on the base and is located in the shell; wherein an oil suction inlet, an oil return inlet and a pump inlet are provided on the base, and the filter element assembly comprises an oil suction filter element and an oil return filter element, wherein the oil suction inlet is communicated with the upstream of the oil suction filter element, and the oil suction inlet is also communicated with the pump inlet through a total bypass valve, and the downstream of the oil suction filter element is communicated with the pump inlet; the return oil inlet is communicated with the upstream of the return oil filter element, and the return oil inlet is communicated with the upstream of the oil suction filter element through a return oil bypass valve, and the downstream of the return oil filter element is communicated with the pump inlet.

2. The oil return integrated filter according to claim 1, characterized in that: The filter element assembly further comprises an upper end cover and a lower end cover arranged opposite to each other, the oil suction filter element and the oil return filter element are both arranged between the upper end cover and the lower end cover, and the oil suction filter element and the oil return filter element are both annular filter elements, the oil suction filter element and the oil return filter element are coaxially arranged, and the oil suction filter element is located on the outside of the oil return filter element; Among them, an oil suction channel is formed between the outer side of the oil suction filter element and the shell, and the oil suction channel is connected to the oil suction inlet; an oil return channel is formed on the inner side of the oil return filter element, and the oil return channel is connected to the oil return inlet, and an intermediate channel is formed between the oil return filter element and the oil suction filter element, and the oil return channel is connected to the intermediate channel through the oil return filter element, and the intermediate channel is also connected to the pump inlet, and the end of the oil return channel away from the oil return inlet is connected to the oil suction channel through the oil return bypass valve, and the oil return bypass valve is installed on the lower end cover.

3. The oil return integrated filter according to claim 2, characterized in that: The oil absorption filter element comprises an oil absorption filter layer and an oil absorption frame; wherein the oil absorption frame is an annular frame, and the oil absorption filter layer is an annular filter layer, and is sleeved on one side of the oil absorption frame close to the oil absorption channel; The oil return filter element comprises an oil return filter layer and an oil return frame; wherein the oil return frame is an annular frame, and the oil return filter layer is an annular filter layer and is attached to a side of the oil return frame close to the oil return channel.

4. The oil return integrated filter according to claim 2, characterized in that: The two ends of the oil suction filter element are respectively bonded and fixed to the upper end cover and the lower end cover by sealant, the two ends of the oil return filter element are respectively bonded and fixed to the upper end cover and the lower end cover by sealant, and the oil return bypass valve is mechanically fixed to the lower end cover.

5. The oil return integrated filter according to any one of claims 2 to 4, characterized in that: The oil return inlet is arranged in the middle of the base, and an oil supply channel is also arranged on the base. The oil supply channel is arranged around the oil return inlet, the oil suction inlet is arranged on one side of the oil supply channel and is communicated with the oil supply channel through the main bypass valve, and the pump inlet is arranged on the other side of the oil supply channel and is communicated with the oil supply channel.

6. The oil return integrated filter according to claim 5, characterized in that: A first annular boss is provided in the middle of the upper end cover, and the return oil inlet is connected to the return oil channel through the first annular boss; a second annular boss is provided at the edge of the upper end cover, and the second annular boss is coaxially arranged with the first annular boss, and the oil supply channel is connected to the middle channel through the second annular boss.

7. The oil return integrated filter according to claim 6, characterized in that: The first annular boss is sealed to the base via a second sealing ring, and the second annular boss is sealed to the base via a third sealing ring.

8. The oil return integrated filter according to claim 1, characterized in that: The shell and the base are sealed and connected via a first sealing ring.

9. The oil return integrated filter according to claim 1, characterized in that: It also includes a pressure alarm, which is used to detect the oil pressure in the oil suction integrated filter and to alarm when the pressure is abnormal.

10. A hydraulic system, characterized in that: It comprises the integrated oil return filter as described in any one of claims 1 to 9.

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