Oil return cylinder and hydraulic oil tank

Abstract

The utility model relates to the technical field of engineering machinery, in particular to an oil return cylinder and a hydraulic oil tank. The oil return cylinder comprises a cylinder body; the first oil return pipe is communicated with the barrel, and the first end of the first oil return pipe is connected with the side wall of the barrel; the one-way valve is arranged in the first oil return pipe; the axis of the first oil return pipe deviates from the axis of the barrel. On the shaft of the first oil return pipe, the length of the first oil return pipe is guaranteed, and meanwhile the size of the oil return barrel can be reduced. The influence of the oil return cylinder on the size of the hydraulic oil tank is reduced, the external size of the hydraulic oil tank is reduced, and maintenance of the hydraulic oil tank and arrangement of other parts of engineering machinery are facilitated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering machinery, and in particular to an oil return cylinder and a hydraulic oil tank. BACKGROUND

[0002] In engineering machinery such as excavators, a hydraulic oil tank provides hydraulic oil for a hydraulic system. An oil return cylinder is installed in the hydraulic oil tank, and a filter element is arranged in the oil return cylinder. Oil returned from the hydraulic system first passes through the oil return cylinder for filtration before flowing into the remaining positions inside the hydraulic oil tank for reuse.

[0003] At present, the hydraulic oil tank comprises a tank body and an oil return cylinder arranged in the tank body. The oil return cylinder comprises a cylinder body and an oil return pipe in communication with the cylinder body. The oil return pipe extends out of the tank body at an end away from the cylinder body. A one-way valve is installed in the oil return pipe to prevent oil return.

[0004] However, the length of the oil return pipe is relatively long, resulting in a relatively large external size of the hydraulic oil tank, which is inconvenient for maintenance of the hydraulic oil tank and arrangement of other components of the engineering machinery. CONTENT OF THE INVENTION

[0005] Therefore, the present application provides an oil return cylinder and a hydraulic oil tank to solve the problem of a relatively large external size of the hydraulic oil tank in the prior art, which is inconvenient for maintenance of the hydraulic oil tank and arrangement of other components of the engineering machinery.

[0006] In a first aspect, the present application provides an oil return cylinder, comprising:

[0007] a cylinder body;

[0008] a first oil return pipe in communication with the cylinder body, a first end of the first oil return pipe being connected to a side wall of the cylinder body;

[0009] a one-way valve arranged in the first oil return pipe;

[0010] wherein an axis of the first oil return pipe is offset from an axis of the cylinder body.

[0011] In a possible implementation, the oil return cylinder further comprises a second oil return pipe in communication with the cylinder body, and a first end of the second oil return pipe being connected to the side wall of the cylinder body.

[0012] In an axial direction of the cylinder body, the first oil return pipe and the second oil return pipe are arranged at intervals.

[0013] In a possible implementation, the axis of the second oil return pipe is directly opposite the axis of the cylinder body.

[0014] In a possible implementation, the axis of the first oil return pipe and the axis of the second oil return pipe are respectively perpendicular to the axis of the cylinder body; or,

[0015] the axis of the first oil return pipe is inclined to the axis of the cylinder body.

[0016] In a possible implementation, the oil return cylinder further comprises a baffle arranged inside the cylinder body;

[0017] In the axial direction of the first oil return pipe, the projection of the baffle on the side wall of the cylinder body covers the first end of the first oil return pipe;

[0018] In the axial direction of the second oil return pipe, the projection of the baffle on the side wall of the cylinder body covers the first end of the second oil return pipe.

[0019] In a possible implementation, the baffle comprises a plate body arranged in an arc shape, and two ends of the plate body are respectively provided with a connecting portion, and one end of each connecting portion away from the plate body is connected with the side wall of the cylinder body.

[0020] In a possible implementation, the line between the center of the baffle in the width direction and the axis of the cylinder body is inclined to the axis of the first oil return pipe.

[0021] In a possible implementation, the connecting position of the side wall of the cylinder body and the first oil return pipe comprises a connecting point adjacent to the axis of the cylinder body, and the side wall of the cylinder body has a first included angle a between the tangent at the connecting point and the axis of the first oil return pipe, and a satisfies:

[0022] 60°≤a≤80°.

[0023] In a possible implementation, the distance between the axis of the first oil return pipe and the axis of the cylinder body is 40mm-60mm.

[0024] In a possible implementation, the second end of the first oil return pipe is provided with a first connecting seat configured to be connected with the hydraulic pipeline, and the thickness of the first connecting seat is 30mm-40mm.

[0025] In a second aspect, the application provides a hydraulic oil tank comprising a tank body and the above-mentioned oil return cylinder, the oil return cylinder being installed in the tank body, and the second end of the first oil return pipe penetrating through the side wall of the tank body.

[0026] The oil return cylinder and the hydraulic oil tank provided by the application, the oil return cylinder comprises a cylinder body, a first oil return pipe and a one-way valve. The first oil return pipe is in communication with the cylinder body, and the first end of the first oil return pipe is connected with the side wall of the cylinder body. The one-way valve is arranged in the first oil return pipe. The axis of the first oil return pipe is offset from the axis of the cylinder body. In this way, in the axial direction of the first oil return pipe, the length of the first oil return pipe is ensured while the size of the oil return cylinder is reduced. The influence of the oil return cylinder on the size of the hydraulic oil tank is reduced, which is conducive to reducing the external size of the hydraulic oil tank and facilitating the maintenance of the hydraulic oil tank and the arrangement of the remaining parts of the engineering machinery. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative labor.

[0028] Figure 1 FIG. 1 is a structural schematic diagram of a hydraulic oil tank in the related art;

[0029] Figure 2 FIG. 2 is a structural schematic diagram of an oil return cylinder in the related art;

[0030] Figure 3 FIG. 3 is a sectional view of the oil return cylinder in the related art;

[0031] Figure 4 FIG. 4 is a structural schematic diagram of a hydraulic oil tank provided by an embodiment of the present application;

[0032] Figure 5 FIG. 5 is a structural schematic diagram of an oil return cylinder provided by an embodiment of the present application;

[0033] Figure 6 FIG. 6 is a sectional view of the oil return cylinder provided by an embodiment of the present application;

[0034] Figure 7 FIG. 7 is a schematic diagram of a cylinder body and a first oil return pipe connection provided by an embodiment of the present application.

[0035] Legend of reference signs:

[0036] 10 - oil return cylinder;

[0037] 100 - cylinder body;

[0038] 210 - first oil return pipe; 220 - second oil return pipe;

[0039] 300 - one-way valve;

[0040] 400 - baffle; 410 - plate body; 420 - connection part;

[0041] 510 - first connecting seat; 520 - second connecting seat;

[0042] 20 - tank body. DETAILED DESCRIPTION

[0043] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be combined with the accompanying drawings of the preferred embodiments of the present application to further specifically describe the technical solutions in the embodiments of the present application. In the accompanying drawings, the same or similar notations represent the same or similar components or components with the same or similar functions throughout. The described embodiments are part of the embodiments of the present application, not all the embodiments. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0044] In the description of the present application, it should be noted that unless specifically defined and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0046] The terms "first", "second", "third" (if any) in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0047] In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or display including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or displays.

[0048] In the prior art, for example, Figures 1-3As shown, the hydraulic oil tank comprises a tank body 20 and an oil return cylinder 10 arranged in the tank body 20, the oil return cylinder 10 comprises a cylinder body 100 and an oil return pipe in communication with the cylinder body 100, and the oil return pipe extends out of the tank body 20 at an end away from the cylinder body 100. In order to avoid the oil flowing back to the hydraulic system through the oil return pipe, a one-way valve 300 is arranged in the oil return pipe. The length of the oil return pipe is limited by the length of the one-way valve 300 in the oil return pipe, and the oil return pipe must be longer than the one-way valve 300. Figures 1-3 As shown, the axis of the oil return pipe is perpendicular to the axis of the cylinder body 100. When the internal space of the tank body 20 is insufficient, a thickened connecting seat is usually arranged outside the tank body 20 to fix the one-way valve 300, and the thickened connecting seat causes the overall external size of the oil tank to increase accordingly, occupying space. When the internal space of the engineering machinery such as the excavator is tight, the one-way valve 300 is inconvenient to disassemble and assemble, affecting normal maintenance and use, and the arrangement of other parts is also affected.

[0049] After repeated thinking and verification, the inventor found that if the oil return pipe of the oil return cylinder is arranged eccentrically, the communication position between the cylinder body of the oil return cylinder and the oil return pipe is changed, that is, the axis of the oil return pipe deviates from the axis of the cylinder body of the oil return cylinder. In this way, while ensuring the length of the first oil return pipe, the size of the oil return cylinder in the axial direction of the first oil return pipe can be reduced. When the internal space of the tank body of the hydraulic oil tank is not thick, the size of the first oil return pipe extending out of the tank body can be reduced, and then the thickness of the connecting seat outside the tank body can be reduced, the external size of the hydraulic oil tank is reduced, the disassembly and assembly of the one-way valve are facilitated, and the arrangement of other parts is also facilitated.

[0050] Therefore, the inventor designs an oil return cylinder and a hydraulic oil tank. The hydraulic oil tank is connected with the first oil return pipe on the side wall of the cylinder body, and the one-way valve is arranged in the first oil return pipe. The first oil return pipe is arranged eccentrically relative to the cylinder body, that is, the axis of the first oil return pipe deviates from the axis of the cylinder body. The size of the oil return cylinder in the axial direction of the first oil return pipe is reduced, the hydraulic oil tank does not need to be provided with a connecting seat with a large thickness, the external size of the hydraulic oil tank is reduced, the disassembly and assembly of the one-way valve are facilitated, and the arrangement of other parts is also facilitated.

[0051] The technical solutions of the oil return cylinder and the hydraulic oil tank provided by the embodiments of the present application are described in detail below with reference to the drawings.

[0052] Reference Figures 3 to 6 As shown, the oil return cylinder 10 provided by the embodiments of the present application comprises a cylinder body 100, a first oil return pipe 210 and a one-way valve 300. The cross-sectional shape of the cylinder body 100 is circular, and the axis of the cylinder body 100 can extend in the vertical direction. Figure 6 As shown, the axis of the cylinder body 100 is located at the intersection of the center line L2 of the cylinder body 100 and the center line L3 of the cylinder body 100, and the axis of the cylinder body 100 is perpendicular to L2 and L3 respectively.

[0053] The first return oil pipe 210 is in communication with the cylinder body 100, and a first end of the first return oil pipe 210 is connected to a side wall of the cylinder body 100. For example, the first end of the first return oil pipe 210 can be connected to the side wall of the cylinder body 100 by welding. A second end of the first return oil pipe 210 is used to connect a hydraulic pipeline of a hydraulic system.

[0054] For example, the cylinder body 100 is internally provided with a filter element, and an oil outlet is formed in a bottom of the cylinder body 100. Oil flowing into the cylinder body 100 from the first return oil pipe 210 can flow out from the oil outlet in the bottom of the cylinder body 100 to other positions inside the hydraulic oil tank after being filtered by the filter element.

[0055] The one-way valve 300 is arranged in the first return oil pipe 210, and specifically, the one-way valve 300 is arranged in the first return oil pipe 210 and fixed to the first return oil pipe 210. Oil can flow into the inside of the cylinder body 100 through the one-way valve 300 in the first return oil pipe 210, and the one-way valve 300 can prevent oil in the cylinder body 100 from flowing out of the first return oil pipe 210. Through the one-way valve 300, oil in the cylinder body 100 can be prevented from flowing back to the hydraulic system through the first return oil pipe 210 and damaging the hydraulic system. It is worth mentioning that the length of the first return oil pipe 210 is not less than the length of the one-way valve 300.

[0056] Here, the axis (L1) of the first return oil pipe 210 deviates from the axis of the cylinder body 100. That is to say, the first return oil pipe 210 of the oil return cylinder 10 is arranged eccentrically. Specifically, as shown in Figure 6 The axis of the first return oil pipe 210 does not intersect the axis of the cylinder body 100. Figure 6 It is shown that when the length of the first return oil pipe 210 is unchanged, the size of the oil return cylinder 10 in the left-right direction can be reduced. The size of the distance between the axis of the first return oil pipe 210 and the axis of the cylinder body 100 is not limited in this embodiment, and a person skilled in the art can set it according to actual needs.

[0057] The oil return cylinder 10 provided in the embodiment includes a cylinder body 100, a first return oil pipe 210, and a one-way valve 300. The first return oil pipe 210 is in communication with the cylinder body 100, and a first end of the first return oil pipe 210 is connected to a side wall of the cylinder body 100. The one-way valve 300 is arranged in the first return oil pipe 210. The axis of the first return oil pipe 210 deviates from the axis of the cylinder body 100. In this way, on the axis of the first return oil pipe 210, the size of the oil return cylinder 10 can be reduced while the length of the first return oil pipe 210 is ensured. The influence of the oil return cylinder 10 on the size of the hydraulic oil tank is reduced, which is beneficial to reducing the external size of the hydraulic oil tank and facilitating the maintenance of the hydraulic oil tank and the arrangement of other parts of the engineering machinery.

[0058] In addition, the first return pipe 210 of the oil return cylinder 10 is arranged eccentrically, so that the one-way valve 300 in the first return pipe 210 can protrude more into the interior of the hydraulic oil tank, the size of the one-way valve 300 protruding from the tank body 20 can be reduced, the thickness of the connecting seat outside the tank body 20 of the hydraulic oil tank can be reduced, and the material cost of the hydraulic oil tank can be reduced.

[0059] In one embodiment, as shown in Figure 5 and Figure 6 , the oil return cylinder 10 further comprises a second return pipe 220, the second return pipe 220 is in communication with the cylinder body 100, and the first end of the second return pipe 220 is connected with the side wall of the cylinder body 100. For example, the second return pipe 220 can be connected with the side wall of the cylinder body 100 by welding. It is worth mentioning that the first return pipe 210 and the second return pipe 220 can both transport oil to the interior of the cylinder body 100, wherein the first return pipe 210 can be used to transport high-pressure oil, and the second return pipe 220 can be used to transport low-pressure oil.

[0060] In the axial direction of the cylinder body 100, the first return pipe 210 and the second return pipe 220 are arranged at intervals. For example, as shown in Figure 5 , in use, the first return pipe 210 can be located above the second return pipe 220, and the first return pipe 210 and the second return pipe 220 are spaced apart in the height direction of the cylinder body 100. Those skilled in the art can set the specific size of the interval between the first return pipe 210 and the second return pipe 220 in the height direction of the cylinder body 100 as needed, which is not limited herein.

[0061] Through the above arrangement, the oil return cylinder 10 can filter high-pressure oil and low-pressure oil at the same time, and the first return pipe 210 and the second return pipe 220 are arranged at intervals in the axial direction of the cylinder body 100, which facilitates the connection of the first return pipe 210 and the second return pipe 220 with the corresponding hydraulic pipelines by the workers.

[0062] In other embodiments, the second return pipe 220 can also be located above the first return pipe 210.

[0063] As shown in Figure 5 and Figure 6 , the axis of the second return pipe 220 is opposite to the axis of the cylinder body 100.

[0064] For example, the second return pipe 220 is arranged centrally, and the axis of the second return pipe 220 intersects with the axis of the cylinder body 100. It can be understood that the side wall of the cylinder body 100 is an arc surface, and when the axis of the second return pipe 220 is opposite to the axis of the cylinder body 100, the slope of the arc surface at the connection position of the second return pipe 220 is the most gentle.

[0065] Through the above arrangement, the slope of the side wall of the cylinder body 100 at the connection position with the second oil return pipe 220 is the most gentle, and the axis of the second oil return pipe 220 is directly opposite the axis of the cylinder body 100, facilitating the connection between the second oil return pipe 220 and the side wall of the cylinder body 100.

[0066] In one possible implementation, as shown in Figure 5 and Figure 6 , the axes of the first oil return pipe 210 and the second oil return pipe 220 are respectively perpendicular to the axis of the cylinder body 100.

[0067] Specifically, the axis of the cylinder body 100 extends in the vertical direction, and the axes of the first oil return pipe 210 and the second oil return pipe 220 respectively extend in the horizontal direction. The above arrangement facilitates the connection between the first oil return pipe 210 and the second oil return pipe 220 and the cylinder body 100. Illustratively, the first oil return pipe 210 and the second oil return pipe 220 are arranged parallel to each other, facilitating the connection of the first oil return pipe 210 and the second oil return pipe 220 with the corresponding hydraulic pipelines.

[0068] In another possible implementation, the axis of the first oil return pipe 210 is inclined to the axis of the cylinder body 100. Among them, the end of the first oil return pipe 210 away from the cylinder body 100 can extend upward or downward relative to the cylinder body 100.

[0069] To avoid interference between the first oil return pipe 210 and the second oil return pipe 220, the second oil return pipe 220 can be arranged in parallel with the first oil return pipe 210, that is, the axis of the second oil return pipe 220 is also inclined to the axis of the cylinder body 100. The above arrangement can further reduce the size of the oil return cylinder 10 in the left-right direction while not changing the length of the first oil return pipe 210, which is beneficial to further reduce the external size of the hydraulic oil tank.

[0070] As shown in Figure 6 , in one specific embodiment, the oil return cylinder 10 further comprises a baffle 400 arranged inside the cylinder body 100. Among them, the baffle 400 is located between the filter element in the cylinder body 100 and the side wall of the cylinder body 100. Illustratively, a metal plate can be used as the baffle 400.

[0071] In the axial direction of the first oil return pipe 210, the projection of the baffle 400 on the side wall of the cylinder body 100 covers the first end of the first oil return pipe 210. It can be understood that the baffle 400 can block the oil entering the inside of the cylinder body 100 from the first oil return pipe 210, avoiding the oil directly impacting the filter element in the cylinder body 100 after entering the inside of the cylinder body 100 from the first oil return pipe 210, thereby causing damage to the filter element. It is worth mentioning that the part of the baffle 400 corresponding to the first end of the first oil return pipe 210 has a gap with the side wall of the cylinder body 100, ensuring that the oil in the first oil return pipe 210 can enter the inside of the cylinder body 100.

[0072] In the axial direction of the second oil return pipe 220, the projection of the baffle plate 400 on the side wall of the cylinder body 100 covers the first end of the second oil return pipe 220. The baffle plate 400 can block the oil liquid from the second oil return pipe 220 into the interior of the cylinder body 100, avoiding the oil liquid from the second oil return pipe 220 directly impacting the filter element in the cylinder body 100 to cause damage to the filter element. The portion of the baffle plate 400 corresponding to the first end of the second oil return pipe 220 has a spacing between the side wall of the cylinder body 100, ensuring that the oil liquid in the second oil return pipe 220 can enter the interior of the cylinder body 100.

[0073] In a possible implementation, the top end of the baffle plate 400 has a spacing with the top wall of the cylinder body 100, and the bottom end of the baffle plate 400 has a spacing with the bottom wall of the cylinder body 100, and through the above spacing, the oil liquid on the side of the baffle plate 400 towards the side wall of the cylinder body 100 can flow to the filter element in the cylinder body 100.

[0074] Figure 6 It is shown that the baffle plate 400 includes a plate body 410 arranged in an arc shape, and the plate body 410 is provided with a connecting portion 420 at each end, and each connecting portion 420 is connected with the side wall of the cylinder body 100 away from the plate body 410.

[0075] Among them, the plate body 410 and the connecting portion 420 can be respectively in a sheet structure, and the plate body 410 and the two connecting portions 420 respectively located at both ends of the plate body 410 can be formed by stamping a metal sheet. For example, in the circumferential direction of the cylinder body 100, the two connecting portions 420 are respectively located at both ends of the plate body 410. In other embodiments, one connecting portion 420 can be located at the top end of the plate body 410, and the other connecting portion 420 can be located at the bottom end of the plate body 410. The end of each connecting portion 420 away from the plate body 410 can be fixed to the inner side wall of the shell by welding.

[0076] As shown in Figure 6 The plate body 410 has a spacing with the side wall of the shell, and thus the plate body 410 will not hinder the oil liquid in the first oil return pipe 210 and the oil liquid in the second oil return pipe 220 from entering the interior of the cylinder body 100.

[0077] Through the above arrangement, the plate body 410 of the baffle plate 400 can cover the first end of the first oil return pipe 210 and the first end of the second oil return pipe 220, avoiding the oil liquid in the oil return pipe from impacting the filter element in the cylinder body 100. In addition, the plate body 410 is arranged in an arc shape, which can avoid interference between the plate body 410 and the filter element.

[0078] In a specific embodiment, the line between the center of the baffle plate 400 in the width direction and the axis of the cylinder body 100 is inclined to the axis of the first oil return pipe 210.

[0079] In existing technologies, such as Figure 3 As shown, the line connecting the center of the baffle 400 in the width direction and the axis of the cylinder 100 lies on the axis of the first return oil pipe 210. Figure 6 As shown, the return oil cylinder 10 provided in this embodiment, compared to Figure 3 In the existing return oil cylinder 10 shown, this is equivalent to rotating the baffle 400 around the axis of the cylinder 100 by a certain angle. The structure of the baffle 400 does not need to be changed, and the width of the baffle 400 will not increase. After rotation, the line connecting the center of the baffle 400 in the width direction and the axis of the cylinder 100 is inclined to the axis of the first return oil pipe 210. This embodiment does not limit the specific rotation angle of the baffle 400, as long as the baffle 400 can cover the first end of the first return oil pipe 210 and the first end of the second return oil pipe 220.

[0080] The above settings can prevent changes to the structure of the baffle 400 from increasing the cost of the return oil cylinder 10.

[0081] In one embodiment, such as Figure 7 As shown, the connection point between the side wall of the cylinder 100 and the first return oil pipe 210 includes a connection point adjacent to the axis of the cylinder 100. Schematic, the connection point is located at... Figure 7 The top of the left end of the first return oil pipe 210.

[0082] The tangent of the side wall of the cylinder 100 at the connection point has a first included angle α with the axis of the first return oil pipe 210. Specifically, the axis of the first return oil pipe 210 is L1, the tangent of the side wall of the cylinder 100 at the connection point is L2, and α is the included angle between L1 and L2.

[0083] α satisfies: 60°≤α≤80°. For example, the value of α can be 60°, 70°, 75°, or 80°, etc., and is not limited to a single value. When α<60°, it indicates that the axis of the first return oil pipe 210 is too far away from the axis of the cylinder 100, which is not convenient for connecting the first return oil pipe 210 and the cylinder 100; when α>80°, it indicates that the axis of the first return oil pipe 210 is too close to the axis of the cylinder 100, which has a small effect on reducing the size of the return oil cylinder 10, and the external size of the hydraulic oil tank may still be large.

[0084] The above configuration allows the first return oil pipe 210 to be easily connected to the cylinder 100, while ensuring that the size of the return oil cylinder 10 can be reliably reduced, thereby reliably reducing the external size of the hydraulic oil tank.

[0085] Illustratively, the distance between the axis of the first return pipe 210 and the axis of the cylinder body 100 is 40-60 mm. For example, the distance between the axis of the first return pipe 210 and the axis of the cylinder body 100 can be 40 mm, 45 mm, 50 mm, 55 mm, or 60 mm, etc., which is not limited herein.

[0086] When the distance between the axis of the first return pipe 210 and the axis of the cylinder body 100 is less than 40 mm, the effect of reducing the size of the return cylinder 10 is small, and the external size of the hydraulic tank can still be large. When the distance between the axis of the first return pipe 210 and the axis of the cylinder body 100 is greater than 60 mm, the position where the cylinder body 100 is connected with the first return pipe 210 is relatively inclined, which is not convenient for the connection between the first return pipe 210 and the cylinder body 100.

[0087] The above arrangement can make the first return pipe 210 more easily connected with the cylinder body 100, while ensuring that the size of the return cylinder 10 can be reliably reduced, thereby reliably reducing the external size of the hydraulic tank.

[0088] In one embodiment, as shown in Figures 3-6 The second end of the first return pipe 210 is provided with a first connecting seat 510, and the first connecting seat 510 is configured to be connected with the hydraulic pipeline.

[0089] The first connecting seat 510 can be a block structure, and the middle part of the first connecting seat 510 is provided with a through hole penetrating through the first connecting seat 510. The second end of the first return pipe 210 can be inserted into the through hole of the first connecting seat 510 and fixed with the first connecting seat 510 by welding. When the return cylinder 10 is connected with the tank body 20 of the hydraulic tank, the first connecting seat 510 is located outside the tank body 20, and the end of the one-way valve 300 away from the cylinder body 100 can extend out of the tank body 20. The part of the one-way valve 300 extending out of the tank body 20 is located in the through hole of the connecting seat.

[0090] Illustratively, the first connecting seat 510 is provided with a plurality of fastening holes, and the end of the hydraulic pipeline can also be provided with a connecting seat, which is also provided with fastening holes. A fastener can be used to pass through the fastening holes of the connecting seat on the hydraulic pipeline and lock in the fastening holes on the first connecting seat 510, so as to connect the first return pipe 210 with the corresponding hydraulic pipeline.

[0091] When the return cylinder 10 is installed in the tank body 20 of the hydraulic tank, the side of the first connecting seat 510 towards the cylinder body 100 can be fixed with the tank body 20 by welding, thereby realizing the connection between the first connecting seat 510 and the tank body 20. Meanwhile, the first connecting seat 510 can also seal the tank body 20.

[0092] The thickness of the first connecting seat 510 is 30-40 mm. The thickness of the first connecting seat 510 is the size of the first connecting seat 510 in the axial direction of the first oil return pipe 210. For example, the thickness of the first connecting seat 510 can be 30 mm, 32 mm, 35 mm, 38 mm or 40 mm, etc., which is not limited herein. The thickness of the first connecting seat 510 is less than the thickness of the connecting seat on the existing first oil return pipe 210. When the thickness of the first connecting seat 510 is less than 30 mm, the one-way valve 300 away from the one end of the cylinder body 100 can extend out of the first connecting seat 510, which causes the one-way valve 300 to be unable to reliably close the first oil return pipe 210; when the thickness of the first connecting seat 510 is greater than 40 mm, on the one hand, the external size of the hydraulic oil tank is increased, and on the other hand, the material cost of the first connecting seat 510 is also increased. The above setting ensures the external size of the hydraulic oil tank and the material cost, while avoiding the one-way valve 300 away from the one end of the cylinder body 100 extending out of the first connecting seat 510.

[0093] As shown in Figures 3-6 As shown in FIG. 1, the second oil return pipe 220 is provided with a second connecting seat 520 at the one end away from the cylinder body 100, and the second connecting seat 520 is located outside the tank body 20 of the hydraulic oil tank, and the corresponding hydraulic pipeline can be connected through the second connecting seat 520.

[0094] The application also provides a hydraulic oil tank, which comprises a tank body 20 and the above-mentioned oil return cylinder 10, the oil return cylinder 10 is installed in the tank body 20, and the second end of the first oil return pipe 210 penetrates through the side wall of the tank body 20.

[0095] As shown in FIG. 1, the second oil return pipe 220 is provided with a second connecting seat 520 at the one end away from the cylinder body 100, and the second connecting seat 520 is located outside the tank body 20 of the hydraulic oil tank, and the corresponding hydraulic pipeline can be connected through the second connecting seat 520.

[0096] The hydraulic oil tank provided by the embodiment has high space utilization in the tank body 20, and the external size of the hydraulic oil tank can be reduced, which is convenient for the maintenance of the hydraulic oil tank.

[0097] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, but not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. An oil return cartridge (10) characterized by, include: cylindrical body (100); The first return oil pipe (210) is connected to the cylinder (100), and the first end of the first return oil pipe (210) is connected to the side wall of the cylinder (100). A one-way valve (300) is installed inside the first return oil pipe (210); The axis of the first return oil pipe (210) is offset from the axis of the cylinder (100).

2. The oil return cartridge (10) of claim 1, characterized in that, The return oil cylinder (10) also includes a second return oil pipe (220), which is connected to the cylinder body (100), and the first end of the second return oil pipe (220) is connected to the side wall of the cylinder body (100); Along the axial direction of the cylinder (100), the first return oil pipe (210) and the second return oil pipe (220) are spaced apart.

3. The oil return cartridge (10) of claim 2, characterized in that, The axis of the second return oil pipe (220) is directly opposite the axis of the cylinder (100).

4. The oil return cartridge (10) of claim 2, wherein, The axis of the first return oil pipe (210) and the axis of the second return oil pipe (220) are respectively perpendicular to the axis of the cylinder (100); or, The axis of the first return oil pipe (210) is inclined to the axis of the cylinder (100).

5. The oil return cartridge (10) of claim 2, wherein, The return oil cylinder (10) also includes a baffle (400) disposed inside the cylinder body (100). In the axial direction of the first return oil pipe (210), the projection of the baffle (400) on the side wall of the cylinder (100) covers the first end of the first return oil pipe (210); In the axial direction of the second return oil pipe (220), the projection of the baffle (400) on the side wall of the cylinder (100) covers the first end of the second return oil pipe (220).

6. The oil return cartridge (10) of claim 5, characterized in that The baffle (400) includes an arc-shaped plate (410), and connecting portions (420) are provided at both ends of the plate (410). The end of each connecting portion (420) away from the plate (410) is connected to the side wall of the cylinder (100).

7. The oil return cartridge (10) of claim 5, wherein, The line connecting the center of the baffle (400) in the width direction and the axis of the cylinder (100) is inclined to the axis of the first return oil pipe (210).

8. The oil return cartridge (10) according to any one of claims 1-7, characterized in that The connection point between the sidewall of the cylinder (100) and the first return oil pipe (210) includes a connection point adjacent to the axis of the cylinder (100). The sidewall of the cylinder (100) forms a first angle α between the tangent at the connection point and the axis of the first return oil pipe (210), where α satisfies: 60°≤α≤80°。 9. The oil return cartridge (10) according to any one of claims 1-7, characterized in that, The distance between the axis of the first return oil pipe (210) and the axis of the cylinder (100) is 40mm-60mm.

10. A hydraulic oil tank characterized by comprising: Includes a housing (20) and an oil return cylinder (10) as described in any one of claims 1-9, wherein the oil return cylinder (10) is installed inside the housing (20) and the second end of the first oil return pipe (210) passes through the side wall of the housing (20).

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