Integrated filtering device integrating oil absorption filter element and oil return filter element

Abstract

The utility model relates to an integrated filtering device integrating an oil absorption filter element and an oil return filter element, and belongs to the field of hydraulic filtering. Comprising a filter element mechanism, a bypass filter mechanism, a magnetic core, a filter cover, a filter shell, a filter oil outlet pipe and a compression spring, the filter shell is of a cylindrical structure, the filter cover is detachably connected with the filter shell, the compression spring is arranged at the bottom end of the inner wall of the filter shell, the filter element mechanism is arranged in the filter shell, the two ends of the filter element mechanism abut against the filter cover and the compression spring respectively, and the filter element mechanism is installed at the end, close to the compression spring, in the filter element mechanism through the filter mechanism. The magnetic core is arranged in the filter element mechanism, and the filter oil outlet pipe is arranged on the side wall of the filter shell. The oil suction pipeline filter element and the oil return pipeline filter element of the pump in the hydraulic system are integrally arranged, and the problem that a vehicle hydraulic system needs to be provided with a plurality of filters and occupies a large space of the whole machine is solved.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic filtration, in particular to an integrated filtration device integrating an oil suction filter element and an oil return filter element. Background Art

[0002] As farmers' living standards improve, the role of tractors in agricultural development is further enhanced, and highly integrated hydraulic systems are increasingly being used in tractors.

[0003] The hydraulic system has high requirements for the cleanliness of the hydraulic oil. Since various impurities, such as welding slag and iron filings, are inevitably present in the system, a filter is required to filter the hydraulic oil. The filter is usually installed in the pump suction oil circuit, the pump discharge oil circuit or the hydraulic system return oil circuit. In order to improve the cleanliness of the hydraulic oil, the tractor hydraulic system usually installs filters in both the pump suction oil circuit and the hydraulic system return oil circuit. However, due to the increase in the number of filters, more space is occupied in the whole machine, which increases the difficulty of arranging the hydraulic components and increases the cost of the tractor.

[0004] The traditional hydraulic oil filter structures for agricultural tractors include horizontal cylindrical type, integrated rotary type, built-in oil tank type, etc. Most existing filters are single-layer filter structures with only one filter element. The structure usually consists of one oil suction port and one oil outlet. If the hydraulic system needs to filter hydraulic oil in different positions at the same time, multiple filters need to be installed, which is costly. At the same time, the oil inlet and outlet of the existing filter are arranged on the same axis, and are basically installed vertically during installation, resulting in a small ground clearance at the bottom of the filter, which is easy to scratch during vehicle operation.

[0005] The existing spin-on filter seat and filter barrel are connected by an intermediate thread. The thread diameter limits the filter diameter. If you want to increase the filtering capacity, you can only lengthen the filter element, which will reduce the ground clearance at the bottom of the filter cartridge when the spin-on filter is installed on the vehicle. When disassembling, the filter cartridge needs to be unscrewed and then disassembled downward, which requires a higher ground clearance.

[0006] Although the existing cylindrical horizontal oil suction filter is not affected by the space of the whole machine when disassembling, it is also a single-layer filtering structure. When disassembling, the front and rear mounting flange end covers need to be removed and the filter element needs to be taken out manually.

[0007] The existing oil tank built-in oil suction filter element saves the space of the whole machine, but is greatly affected by the internal structure of the hydraulic oil tank of the whole machine, and must be installed and used at the same time as the hydraulic pipeline. Utility Model Content

[0008] The technical problem to be solved by the utility model is to provide an integrated filtering device which integrates an oil suction filter element and an oil return filter element, so as to solve the above-mentioned problem.

[0009] The technical solution of the utility model for solving the above technical problems is as follows: an integrated filtering device integrating an oil suction filter element and an oil return filter element, comprising: a filter element mechanism, a bypass filter mechanism, a magnetic core, a filter cover, a filter housing, a filter oil outlet pipe and a compression spring; the filter housing is a cylindrical structure, the filter cover is detachably connected to the filter housing, the compression spring is arranged at the bottom end of the inner wall of the filter housing, the filter element mechanism is arranged inside the filter housing, and the two ends are respectively abutted against the filter cover and the compression spring, the bypass filter mechanism is installed in the filter element mechanism at one end close to the compression spring, the magnetic core is arranged in the filter element mechanism, and the filter oil outlet pipe is arranged on the side wall of the filter housing.

[0010] The beneficial effects of the utility model are as follows: the filter element mechanism and the bypass filter mechanism are conducive to the integrated arrangement of the oil suction line filter element of the pump in the hydraulic system and the oil return line filter element of the hydraulic system, and are integrated into the cylindrical structure formed by the filter cover and the filter housing, thereby solving the problem that the vehicle hydraulic system needs to install multiple filters and occupies a large space of the whole machine; it is conducive to increasing the nominal flow rate and filtering area of ​​the filtering device by increasing the diameter of the filter element; the magnetic core is conducive to adsorbing impurities such as welding slag and iron filings in the hydraulic oil, thereby extending the service life of the filter element; and the filter oil outlet pipe is arranged on the side wall of the filter housing, which is conducive to flexible adjustment according to the oil suction port of the pump, thereby increasing the convenience of the pipeline layout of the hydraulic system.

[0011] On the basis of the above technical solution, the present invention can also be improved as follows.

[0012] Furthermore, the filter element mechanism includes: an oil suction filter element, an oil return filter element, two first connecting shells and two second connecting shells; the oil suction filter element and the oil return filter element are both annular structures, the oil return filter element is arranged inside the oil suction filter element, the two ends of the oil suction filter element are respectively installed on the two first connecting shells, the two ends of the oil return filter element are respectively installed on the two second connecting shells, and the second connecting shell close to one end of the filter cover is connected to the first connecting shell close to one end of the filter cover.

[0013] The beneficial effects of adopting the above further scheme are: the annular oil suction filter element and the oil return filter element are conducive to increasing the nominal flow and filtering area of ​​the filtering device by increasing the diameter, thereby improving the filtering capacity; the first connecting shell and the second connecting shell are conducive to forming the oil suction filter element, the oil return filter element and the bypass filtering mechanism into a whole, thereby solving the problem that the vehicle hydraulic system needs to install multiple filters and occupies a large space of the entire machine.

[0014] Furthermore, the two first connection shells are respectively engaged with the filter cover and abut against the compression spring, and the two second connection shells are respectively engaged with the filter cover and fixedly connected with the bypass filter mechanism.

[0015] The beneficial effect of adopting the above further solution is that the connection method between the first connecting shell and the second connecting shell is conducive to improving the convenience of disassembly and assembly of the filter element mechanism and the bypass filter mechanism.

[0016] Furthermore, the bypass filtering mechanism includes: a return oil bypass valve, a bypass coarse filter element and an oil suction bypass valve; the bypass coarse filter element is an annular structure installed on the first connecting shell, the return oil bypass valve seal is arranged at one end of the bypass coarse filter element close to the return oil filter element, and the oil suction bypass valve is arranged inside the bypass coarse filter element close to one end of the compression spring.

[0017] The beneficial effect of adopting the above further solution is that the bypass coarse filter element is conducive to coarse filtering of the hydraulic oil when the oil suction filter element and / or the oil return filter element are blocked, thereby improving the stability of the filtering device during operation.

[0018] Furthermore, the space inside the return oil filter is the return oil filter oil inlet chamber, the space inside the bypass coarse filter is the bypass filter oil chamber, and the two ends of the return oil bypass valve are connected to the return oil filter oil inlet chamber and the bypass filter oil chamber respectively.

[0019] The beneficial effect of adopting the above further scheme is that the return oil bypass valve is conducive to the hydraulic oil of the return oil circuit entering the bypass filter oil cavity through the return oil bypass valve when the return oil filter is blocked, and then being filtered by the bypass coarse filter.

[0020] Furthermore, the magnetic core is arranged in the oil inlet cavity of the oil return filter element, and the filter cover is provided with an oil return port, which is a through hole connected to the oil inlet cavity of the oil return filter element.

[0021] The beneficial effect of adopting the above further solution is that the magnetic core is conducive to absorbing impurities such as welding slag and iron filings in the return oil entering the oil inlet cavity of the return oil filter element from the return oil port, thereby extending the service life of the filter element.

[0022] Furthermore, the space between the oil suction filter element and the oil return filter element is an oil suction chamber, and the filter cover is provided with a plurality of oil suction ports, and the oil suction ports are waist-shaped through holes connected to the oil suction chamber.

[0023] The beneficial effect of adopting the above further solution is that the oil suction port is conducive to connecting the oil tank of the hydraulic system with the oil suction chamber, and cooperates with the oil suction filter element to filter the hydraulic oil in the oil tank.

[0024] Furthermore, the oil suction port is connected to the oil tank of the hydraulic system through an oil pipe, and the oil return port is connected to the oil return circuit of the hydraulic system through an oil pipe.

[0025] The beneficial effects of adopting the above further scheme are: the oil suction port is conducive to connecting the oil tank of the hydraulic system with the filtering device, thereby filtering the hydraulic oil in the oil tank; the oil return port is conducive to connecting the return oil circuit of the hydraulic system with the filtering device, thereby filtering the hydraulic oil in the return oil circuit of the hydraulic system.

[0026] Furthermore, the space between the oil suction filter element and the filter housing is a filter oil chamber, the two ends of the oil suction bypass valve are respectively connected to the filter oil chamber and the bypass filter element oil chamber, and the filter oil outlet pipe is connected to the filter oil chamber.

[0027] The beneficial effect of adopting the above further scheme is that the oil suction bypass valve is conducive to filtering the hydraulic oil in the oil suction circuit by using the bypass coarse filter element when the oil suction filter element is blocked, and the filtered hydraulic oil enters the filter oil chamber through the oil suction bypass valve and enters the hydraulic pump from the filter oil outlet pipe.

[0028] Furthermore, the oil outlet pipe of the filter is a tubular structure, and the oil outlet pipe of the filter is connected to the oil suction chamber of the pump in the hydraulic system through an oil pipe.

[0029] The beneficial effect of adopting the above further scheme is that the filter oil outlet pipe is conducive to connecting the hydraulic oil in the oil suction circuit with the oil suction chamber of the pump in the hydraulic system, so that under the negative pressure generated by the pump, the hydraulic oil in the hydraulic system tank is filtered through the oil suction filter element to obtain clean hydraulic oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of the overall structure provided by an embodiment of the utility model;

[0031] Figure 2 A side view of the overall structure provided for an embodiment of the utility model.

[0032] in, Figure 1 The solid line and arrow in the figure indicate the flow of oil from the oil tank into the filter device, and the dotted line and arrow indicate the flow of oil from the hydraulic system valve body back to the filter device.

[0033] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0034] 1. Filter element mechanism; 2. Bypass filter mechanism; 3. Magnetic core; 4. Filter cover; 5. Filter housing; 6. Filter oil outlet pipe; 7. Return oil filter element oil inlet chamber; 8. Suction oil chamber; 9. Filter oil chamber; 10. Bypass filter element oil chamber; 11. Compression spring; 101. Suction filter element; 102. Return oil filter element; 103. First connecting housing; 104. Second connecting housing; 201. Return oil bypass valve; 202. Bypass coarse filter element; 203. Suction oil bypass valve; 401. Suction port; 402. Return oil port. DETAILED DESCRIPTION

[0035] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0036] like Figure 1 and Figure 2 As shown, an integrated filtering device integrating an oil suction filter element and an oil return filter element comprises: a filter element mechanism 1, a bypass filter mechanism 2, a magnetic core 3, a filter cover 4, a filter housing 5, a filter oil outlet pipe 6 and a compression spring 11; the filter housing 5 is a cylindrical structure, the filter cover 4 is detachably connected to the filter housing 5, the compression spring 11 is arranged at the bottom end of the inner wall of the filter housing 5, the filter element mechanism 1 is arranged inside the filter housing 5, and the two ends are respectively abutted against the filter cover 4 and the compression spring 11, the bypass filter mechanism 2 is installed in the filter element mechanism 1 at one end close to the compression spring 11, the magnetic core 3 is arranged in the filter element mechanism 1, and the filter oil outlet pipe 6 is arranged on the side wall of the filter housing 5.

[0037] It should be noted that in a preferred embodiment of the present invention, the filter cover 4 and the filter housing 5 can be connected by front and rear flanges instead of the circumferential threaded holes in the prior art, so that the filter device can be installed horizontally or vertically on the tractor, which increases the flexibility of the installation position of the filter device in the overall machine space and saves the overall machine space.

[0038] The beneficial effects of the utility model are as follows: the filter element mechanism and the bypass filter mechanism are conducive to the integrated arrangement of the oil suction line filter element of the pump in the hydraulic system and the oil return line filter element of the hydraulic system, and are integrated into the cylindrical structure formed by the filter cover and the filter housing, thereby solving the problem that the vehicle hydraulic system needs to install multiple filters and occupies a large space of the whole machine; it is conducive to increasing the nominal flow rate and filtering area of ​​the filtering device by increasing the diameter of the filter element; the magnetic core is conducive to adsorbing impurities such as welding slag and iron filings in the hydraulic oil, thereby extending the service life of the filter element; and the filter oil outlet pipe is arranged on the side wall of the filter housing, which is conducive to flexible adjustment according to the oil suction port of the pump, thereby increasing the convenience of the pipeline layout of the hydraulic system.

[0039] Preferably, Figure 1As shown, the filter element mechanism 1 includes: an oil suction filter element 101, an oil return filter element 102, two first connecting shells 103 and two second connecting shells 104; the oil suction filter element 101 and the oil return filter element 102 are both annular structures, the oil return filter element 102 is arranged inside the oil suction filter element 101, the two ends of the oil suction filter element 101 are respectively installed on the two first connecting shells 103, the two ends of the oil return filter element 102 are respectively installed on the two second connecting shells 104, and the second connecting shell 104 close to one end of the filter cover 4 is connected to the first connecting shell 103 close to one end of the filter cover 4.

[0040] The beneficial effects of adopting the above-mentioned preferred scheme are: the annular oil suction filter element and the oil return filter element are conducive to increasing the nominal flow rate and the filtering area of ​​the filtering device by increasing the diameter, thereby improving the filtering capacity; the first connecting shell and the second connecting shell are conducive to forming the oil suction filter element, the oil return filter element and the bypass filtering mechanism into a whole, thereby solving the problem that the vehicle hydraulic system needs to install multiple filters and occupies a large space of the whole machine.

[0041] Preferably, Figure 1 As shown, the two first connection shells 103 are respectively engaged with the filter cover 4 and abut against the compression spring 11 , and the two second connection shells 104 are respectively engaged with the filter cover 4 and fixedly connected with the bypass filter mechanism 2 .

[0042] The beneficial effect of adopting the above preferred solution is that the connection method between the first connecting shell and the second connecting shell is conducive to improving the convenience of disassembly and assembly of the filter element mechanism and the bypass filter mechanism.

[0043] Preferably, Figure 1 As shown, the bypass filtering mechanism 2 includes: a return oil bypass valve 201, a bypass coarse filter element 202 and an oil suction bypass valve 203; the bypass coarse filter element 202 is an annular structure installed on the first connecting shell 103, the return oil bypass valve 201 is sealed and arranged at one end of the bypass coarse filter element 202 close to the return oil filter element 102, and the oil suction bypass valve 203 is arranged inside the bypass coarse filter element 202 close to one end of the compression spring 11.

[0044] The beneficial effect of adopting the above preferred solution is that the bypass coarse filter element is conducive to coarse filtering of the hydraulic oil when the oil suction filter element and / or the oil return filter element are blocked, thereby improving the stability of the filtering device during operation.

[0045] Preferably, Figure 1As shown, the space inside the return oil filter 102 is the return oil filter oil inlet chamber 7, the space inside the bypass coarse filter 202 is the bypass filter oil chamber 10, and the two ends of the return oil bypass valve 201 are connected to the return oil filter oil inlet chamber 7 and the bypass filter oil chamber 10 respectively.

[0046] The beneficial effect of adopting the above preferred solution is that the return oil bypass valve is conducive to the hydraulic oil of the return oil circuit entering the bypass filter oil cavity through the return oil bypass valve when the return oil filter is blocked, and then being filtered by the bypass coarse filter.

[0047] Preferably, Figure 1 As shown, the magnetic core 3 is arranged in the oil inlet cavity 7 of the oil return filter element, and the filter cover 4 is provided with an oil return port 402 , which is a through hole connected to the oil inlet cavity 7 of the oil return filter element.

[0048] It should be noted that the magnetic core 3 is fixedly installed in the oil inlet cavity 7 of the oil return filter element, so that when the filter element mechanism 1 and the bypass filter mechanism 2 are taken and placed, the magnetic core 3 is taken and placed synchronously.

[0049] The beneficial effect of adopting the above preferred solution is that the magnetic core is conducive to absorbing impurities such as welding slag and iron filings in the return oil entering the oil inlet cavity of the return oil filter element from the return oil port, thereby extending the service life of the filter element.

[0050] Preferably, Figure 1 As shown, the space between the oil suction filter element 101 and the oil return filter element 102 is an oil suction chamber 8 , and the filter cover 4 is provided with a plurality of oil suction ports 401 , and the oil suction ports 401 are waist-shaped through holes connected to the oil suction chamber 8 .

[0051] The beneficial effect of adopting the above preferred solution is that the oil suction port is conducive to connecting the oil tank of the hydraulic system with the oil suction chamber, and cooperates with the oil suction filter element to filter the hydraulic oil in the oil tank.

[0052] Preferably, the oil suction port 401 is connected to the oil tank of the hydraulic system through an oil pipe, and the oil return port 402 is connected to the oil return circuit of the hydraulic system through an oil pipe.

[0053] The beneficial effects of adopting the above-mentioned preferred scheme are: the oil suction port is conducive to connecting the oil tank of the hydraulic system with the filtering device, thereby filtering the hydraulic oil in the oil tank; the oil return port is conducive to connecting the return oil circuit of the hydraulic system with the filtering device, thereby filtering the hydraulic oil in the return oil circuit of the hydraulic system.

[0054] Preferably, Figure 1As shown, the space between the oil suction filter element 101 and the filter housing 5 is a filter oil chamber 9, the two ends of the oil suction bypass valve 203 are respectively connected to the filter oil chamber 9 and the bypass filter element oil chamber 10, and the filter oil outlet pipe 6 is connected to the filter oil chamber 9.

[0055] The beneficial effect of adopting the above-mentioned preferred scheme is that the oil suction bypass valve is conducive to filtering the hydraulic oil in the oil suction circuit by using the bypass coarse filter element when the oil suction filter element is blocked, and the filtered hydraulic oil enters the filter oil chamber through the oil suction bypass valve, and enters the hydraulic pump from the filter oil outlet pipe.

[0056] Preferably, the filter oil outlet pipe 6 is a tubular structure, and the filter oil outlet pipe 6 is connected to the oil suction chamber of the pump in the hydraulic system through an oil pipe.

[0057] The beneficial effect of adopting the above preferred scheme is that the filter oil outlet pipe is conducive to connecting the hydraulic oil in the oil suction circuit with the oil suction chamber of the pump in the hydraulic system, so that under the negative pressure generated by the pump, the hydraulic oil in the hydraulic system tank is filtered through the oil suction filter element to obtain clean hydraulic oil.

[0058] The working process of the utility model is described below by an embodiment:

[0059] like Figure 1 and Figure 2 As shown, the direction of the oil suction filter is as follows: the hydraulic oil in the hydraulic system tank enters the oil suction chamber 8 through the connected oil pipe and the oil suction port 401. Since the filter oil outlet pipe 6 is connected to the oil suction chamber of the pump in the hydraulic system, under normal working conditions, the pump in the hydraulic system generates suction, and negative pressure is generated in the filter oil chamber 9. Under the action of negative pressure, a large amount of hydraulic oil in the oil suction chamber 8 will enter the filter oil chamber 9 after being filtered by the oil suction filter element 101, and then enter the oil suction chamber of the pump in the hydraulic system through the filter oil outlet pipe 6. At the same time, a small amount of hydraulic oil in the oil suction chamber 8 will also pass through the bypass coarse filter element 202 and enter the bypass filter element oil chamber 10. At this time, since the hydraulic oil pressure entering the bypass filter element oil chamber 10 does not reach the opening pressure value of the oil suction bypass valve 203, the filtered hydraulic oil will not enter the filter oil chamber 9 through the oil suction bypass valve 203.

[0060] The flow of the return oil filter oil is as follows: the hydraulic oil of the return oil circuit of the hydraulic system enters the return oil filter element oil inlet chamber 7 through the return oil port 402. At this time, the magnetic core 3 adsorbs impurities such as welding slag and iron filings in the hydraulic oil in the return oil circuit. At the same time, the hydraulic oil in the return oil circuit enters the oil suction chamber 8 after being filtered by the return oil filter element 102, and enters the filter oil chamber 9 after being filtered by the oil suction filter element 101 under the action of negative pressure, and then enters the oil suction chamber of the pump in the hydraulic system through the filter outlet pipe 6. At the same time, since all the hydraulic oil in the return oil filter element oil inlet chamber 7 enters the oil suction chamber 8 through the return oil filter element 102, the pressure on the return oil bypass valve 201 is relatively small and will not exceed the opening pressure value of the return oil bypass valve 201. Therefore, the hydraulic oil in the return oil filter element oil inlet chamber 7 will not pass through the return oil bypass valve 201 and enter the bypass filter element oil chamber 10;

[0061] When the oil suction filter 101 is blocked, due to the negative pressure in the filter oil chamber 9, under the action of the negative pressure, the hydraulic oil in the oil suction chamber 8 cannot pass through the oil suction filter 101, and a large amount of it will pass through the bypass coarse filter 202 into the bypass filter oil chamber 10. At this time, the negative pressure in the filter oil chamber 9 increases, and the pressure difference with the bypass filter oil chamber 10 will also increase accordingly. When the pressure difference is greater than the opening pressure value of the oil suction bypass valve 203, the oil suction bypass valve 203 opens, and the hydraulic oil filtered in the bypass filter oil chamber 10 will pass through the oil suction bypass valve 203 into the filter oil chamber 9, and then enter the oil suction chamber of the pump in the hydraulic system through the filter oil outlet pipe 6;

[0062] When the return oil filter 102 is blocked, the hydraulic oil in the return oil filter inlet chamber 7 cannot pass through the return oil filter 102, and a large pressure will be formed at the return oil bypass valve 201. When the pressure value is greater than the opening pressure value of the return oil bypass valve 201, the hydraulic oil in the return oil filter inlet chamber 7 passes through the return oil bypass valve 201 and enters the bypass filter oil chamber 10, and enters the oil suction chamber 8 after being filtered by the bypass coarse filter 202. Under the action of negative pressure, the hydraulic oil in the oil suction chamber 8 enters the filter oil chamber 9 after being filtered by the oil suction filter 101, and then enters the oil suction chamber of the pump in the hydraulic system through the filter outlet pipe 6;

[0063] When both the oil suction filter 101 and the oil return filter 102 are blocked, the hydraulic oil in the oil suction chamber 8 enters the bypass filter oil chamber 10 after being filtered by the bypass coarse filter 202, and enters the filter oil chamber 9 through the oil suction bypass valve 203, and then enters the oil suction chamber of the pump in the hydraulic system through the filter oil outlet pipe 6. The hydraulic oil in the oil inlet chamber 7 of the return filter also enters the bypass filter oil chamber 10 through the oil return bypass valve 201, and enters the filter oil chamber 9 through the oil suction bypass valve 203, and then enters the oil suction chamber of the pump in the hydraulic system through the filter oil outlet pipe 6.

[0064] The utility model integrates the oil suction line filter of the pump and the return oil line filter of the hydraulic system, thereby reducing the number of filters, reducing the space occupied by the filter in the whole machine, and providing convenience for the component arrangement of the hydraulic system; in the utility model, the hydraulic oil in the return oil circuit of the hydraulic system does not enter the oil tank after being filtered by the return oil filter element, and can directly participate in the system circulation through the oil suction filter element, thereby avoiding the oil filtered by the return oil filter element from being contaminated by the oil in the oil tank, thereby improving the filtering efficiency; the filtering device in the utility model can be installed horizontally, thereby solving the problem that the traditional longitudinally installed filter is too close to the ground and difficult to disassemble and assemble; the filter cover and the filter housing in the filtering device of the utility model are detachably connected, and can be installed through connecting flanges at the front and back, thereby improving the flexibility of installation; a magnetic core is arranged inside the return oil filter element in the filtering device of the utility model, thereby increasing the service life of the return oil filter element.

[0065] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0066] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0067] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0068] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0070] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An integrated filtering device integrating an oil suction filter element and an oil return filter element, characterized in that: include: A filter element mechanism (1), a bypass filter mechanism (2), a magnetic core (3), a filter cover (4), a filter housing (5), a filter oil outlet pipe (6) and a compression spring (11); The filter housing (5) is a cylindrical structure; the filter cover (4) is detachably connected to the filter housing (5); the compression spring (11) is arranged at the bottom end of the inner wall of the filter housing (5); the filter element mechanism (1) is arranged inside the filter housing (5), and its two ends are respectively in contact with the filter cover (4) and the compression spring (11); the bypass filter mechanism (2) is installed in the filter element mechanism (1) at one end close to the compression spring (11); the magnetic core (3) is arranged in the filter element mechanism (1); and the filter oil outlet pipe (6) is arranged on the side wall of the filter housing (5).

2. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 1, characterized in that: The filter element mechanism (1) comprises: an oil suction filter element (101), an oil return filter element (102), two first connection shells (103) and two second connection shells (104); the oil suction filter element (101) and the oil return filter element (102) are both annular structures; the oil return filter element (102) is arranged inside the oil suction filter element (101); the two ends of the oil suction filter element (101) are respectively mounted on the two first connection shells (103); the two ends of the oil return filter element (102) are respectively mounted on the two second connection shells (104); and the second connection shell (104) close to one end of the filter cover (4) is connected to the first connection shell (103) close to one end of the filter cover (4).

3. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 2, characterized in that: The two first connection shells (103) are respectively engaged with the filter cover (4) and abut against the compression spring (11), and the two second connection shells (104) are respectively engaged with the filter cover (4) and fixedly connected to the bypass filter mechanism (2).

4. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 2, characterized in that: The bypass filtering mechanism (2) comprises: an oil return bypass valve (201), a bypass coarse filter element (202) and an oil suction bypass valve (203); the bypass coarse filter element (202) is an annular structure mounted on the first connecting shell (103); the oil return bypass valve (201) is sealingly arranged at one end of the bypass coarse filter element (202) close to the oil return filter element (102); and the oil suction bypass valve (203) is arranged inside the bypass coarse filter element (202) close to one end of the compression spring (11).

5. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 4, characterized in that: The space inside the return oil filter element (102) is the return oil filter element oil inlet chamber (7), the space inside the bypass coarse filter element (202) is the bypass filter element oil chamber (10), and the two ends of the return oil bypass valve (201) are respectively connected to the return oil filter element oil inlet chamber (7) and the bypass filter element oil chamber (10).

6. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 5, characterized in that: The magnetic core (3) is arranged in the oil inlet cavity (7) of the oil return filter element, and the filter cover (4) is provided with an oil return port (402), which is a through hole connected to the oil inlet cavity (7) of the oil return filter element.

7. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 6, characterized in that: The space between the oil suction filter element (101) and the oil return filter element (102) is an oil suction chamber (8), and the filter cover (4) is provided with a plurality of oil suction ports (401), wherein the oil suction ports (401) are waist-shaped through holes connected to the oil suction chamber (8).

8. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 7, characterized in that: The oil suction port (401) is connected to the oil tank of the hydraulic system through an oil pipe, and the oil return port (402) is connected to the oil return circuit of the hydraulic system through an oil pipe.

9. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 5, characterized in that: The space between the oil suction filter element (101) and the filter housing (5) is a filter oil chamber (9); two ends of the oil suction bypass valve (203) are respectively connected to the filter oil chamber (9) and the bypass filter element oil chamber (10); and the filter oil outlet pipe (6) is connected to the filter oil chamber (9).

10. The one-piece filtering device integrating an oil suction filter element and an oil return filter element according to claim 9, characterized in that: The filter oil outlet pipe (6) is a tubular structure, and the filter oil outlet pipe (6) is connected to the oil suction chamber of the pump in the hydraulic system through an oil pipe.

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