Hydraulic oil tank and hydraulic system comprising same
By designing a double partition structure and opening layout in the hydraulic oil tank, the filtration and reduction of gas are achieved, the problem of bubble entry in the hydraulic system is solved, and the stability of the system and the safety of components are improved.
Patent Information
- Application Number
- CN202420874161.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-25
- Publication Date
- 2025-01-14
- Estimated Expiration
- 2034-04-25
AI Technical Summary
In existing hydraulic systems, bubbles produced by gas easily enter the oil-absorbing chamber, resulting in air pockets, especially when pressure changes rapidly, which may damage components.
A hydraulic oil tank is designed, and the oil tank chamber is divided into an oil return chamber, an intermediate chamber and an oil suction chamber, and fluid communication is made through the first and second openings, the first opening is Located below the oil return chamber, the second opening is above the intermediate chamber, forming a double filtration effect to reduce gas entry.
It effectively reduces the amount of gas entering the hydraulic system, reduces the frequency of bubbles entering, protects components, and avoids damage caused by air cavitation.
Smart Images
Figure CN222351042U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the hydraulic field, in particular to a hydraulic oil tank and a hydraulic system comprising the hydraulic oil tank. Background Art
[0002] Figure 1a and 1b A hydraulic oil tank 100 in the prior art is shown, which has a partition plate 110 that separates the oil return chamber and the oil suction chamber of the hydraulic oil tank. As shown in the figure, the partition plate is opened at the top to allow hydraulic oil to flow from the oil return chamber into the oil suction chamber via the top of the partition plate.
[0003] When the hydraulic system is working normally, the hydraulic oil will flow from the oil return chamber to the oil suction chamber and then be discharged to other parts of the hydraulic system through the oil suction chamber. When the hydraulic oil returns to the oil return chamber through the oil inlet, more small bubbles will be generated. Since the density of gas is smaller than that of hydraulic oil, the bubbles generated will continue to accelerate upward transfer. Bubbles are a process of continuous generation and discharge from the oil surface. In this process, most of the bubbles will exist in the upper part of the oil return chamber. These bubbles are easy to flow to the oil suction chamber through the upper area of the partition plate, and are easily sucked into the oil suction port, causing air to enter other parts of the hydraulic system, thereby producing the "cavitation" phenomenon that is more common in the hydraulic system. When the system pressure is quickly converted from a low-pressure environment to a high-pressure environment, the gas will be quickly squeezed, the gas volume will change suddenly, and high temperature and high pressure will be generated, resulting in damage to components, causing "pitting" to cause irreversible damage to components. Utility Model Content
[0004] The purpose of the present invention is to solve some or all of the above-mentioned defects and / or other problems existing in the prior art. In particular, the present invention provides a hydraulic oil tank and a hydraulic system including the hydraulic oil tank, which can reduce the amount of gas entering the hydraulic system part outside the hydraulic oil tank.
[0005] To this end, according to one aspect of the utility model, a hydraulic oil tank is provided, comprising an oil tank shell, in which a partition device is arranged, characterized in that the partition device comprises at least two vertically arranged partition parts, the partition parts divide the chamber defined by the oil tank shell into an oil return chamber, an intermediate chamber and an oil suction chamber, wherein a first opening is formed on the first partition part separating the oil return chamber and the intermediate chamber, so that the oil return chamber and the intermediate chamber are fluidically connected, and the maximum allowable liquid level of the oil return chamber is lower than the top of the first partition part, and a second opening is formed on the second partition part separating the intermediate chamber and the oil suction chamber, so that the intermediate chamber and the oil suction chamber are fluidically connected, wherein in the vertical direction, the first opening is located below the maximum allowable liquid level and above the second opening.
[0006] Preferably, the at least two partition parts also include one or more vertically arranged middle partition parts located between the first partition part and the second partition part to divide the intermediate chamber into two or more sub-filter chambers, and each middle partition part is provided with a filter port to allow the hydraulic oil entering the intermediate chamber through the first opening to flow into adjacent sub-filter chambers in sequence through the filter port and finally flow out of the intermediate chamber through the second opening.
[0007] Preferably, in the flow direction of the hydraulic oil flowing from the oil return chamber into the oil suction chamber via the sub-filter chambers of the intermediate chamber, the height positions of the first opening, the filter ports and the second opening are successively reduced.
[0008] Preferably, the vertical height distance of the highest oil inlet point of the first opening relative to the bottom of the oil tank is 40% to 70% of the vertical height distance of the highest allowable liquid level relative to the bottom of the oil tank.
[0009] Preferably, the vertical height distance of the lowest oil inlet point of the first opening relative to the bottom of the oil tank is 35% to 65% of the vertical height distance of the highest allowable liquid level relative to the bottom of the oil tank.
[0010] Preferably, the vertical height distance of the highest oil outlet point of the second opening relative to the bottom of the oil tank is 5% to 35% of the vertical height distance of the highest allowable liquid level relative to the bottom of the oil tank.
[0011] Preferably, each of the first opening and the second opening is an elongated opening extending in a horizontal direction.
[0012] According to a second aspect of the utility model, a hydraulic system is provided, which includes the above-mentioned hydraulic oil tank.
[0013] With the hydraulic oil tank and the hydraulic system including the hydraulic oil tank according to the utility model, since the first opening is lower than the highest allowable liquid level of the oil return chamber, the gas above the hydraulic oil cannot enter the intermediate chamber through the first opening. In addition, since the gas entering the intermediate chamber through the first opening will transfer from bottom to top, by making the height of the second opening lower than the first opening, less gas can enter the oil suction chamber through the second opening, so that a large number of bubbles can be filtered out under the dual effects of the first opening and the second opening. Thus, the amount of gas entering the hydraulic system part outside the hydraulic oil tank is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The objects, advantages and features of the present invention will become more apparent in the following detailed description of embodiments of the present invention given by way of non-limiting examples with reference to the accompanying drawings, in which:
[0015] Figure 1a and1b The perspective schematic diagrams of the hydraulic oil tank of the prior art are respectively shown;
[0016] Figure 2 A perspective schematic diagram of a hydraulic oil tank according to an embodiment of the utility model is shown;
[0017] Figure 3-5 They are shown respectively Figure 2 A schematic perspective view of the hydraulic oil tank shown in FIG. 1 from different angles, wherein a portion of the oil tank housing is removed; and
[0018] Figure 6 Shows Figure 2 A schematic front view of a hydraulic oil tank is shown with a portion of the tank housing removed.
[0019] Reference numerals list
[0020] 100: hydraulic oil tank (prior art); 110: partition plate (prior art); 200: hydraulic oil tank (the present utility model); 210: oil tank housing; 211: oil inlet; 212: oil outlet; 220: oil return filter element; 230: partition device; 231: first opening; 232: second opening; 233: first partition plate portion; 234: second partition plate portion; 240: maximum allowable liquid level; 250: oil outlet pipe; 251: vertical portion; 252: oil suction port DETAILED DESCRIPTION
[0021] The hydraulic oil tank and the hydraulic system including the hydraulic oil tank according to the embodiment of the utility model are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that the technical personnel in the relevant technical field can have a more comprehensive understanding of the utility model. However, it is obvious to the technical personnel in the relevant technical field that the implementation of the utility model may not have some of these specific details. In addition, it should be understood that the utility model is not limited to the specific embodiments described. On the contrary, it is contemplated to implement the utility model with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, unless explicitly stated in the claims, the following features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims.
[0022] In the following description, certain terms are used for reasons of convenience and are not intended to limit the utility model. The terms "upper", "lower", "below" and "above" refer to directions in the figure. The terms include terms explicitly mentioned and their derivatives and terms with similar meanings. In addition, spatial relative terms such as "under...", "below", "lower", "above", "upper" may be used to describe the relationship between an element or feature structure as shown in the figure and another element or feature structure. These spatial relative terms are intended to cover different positions and orientations of the device in use or operation in addition to the positions and orientations shown in the figures.
[0023] Figure 2-6 The schematic perspective view of a hydraulic oil tank 200 according to an embodiment of the present invention is shown. As shown in the figure, the hydraulic oil tank 200 includes an oil tank shell 210 defining an oil tank inner cavity and a partition device 230 disposed in the oil tank shell 210. The oil tank shell 210 has an oil inlet 211 (at Figure 2-3 ) and the oil outlet 212 (shown in Figure 5 The oil inlet pipe extends into the oil return chamber via the oil inlet port 211. The oil suction pipe 250 extends into the oil suction chamber via the oil outlet port 212. Figure 4-6 As shown, the oil outlet pipe 250 may be L-shaped and may include a vertical portion 251 having an oil suction port 252 extending at least partially into the oil suction chamber through the oil outlet port 212 and a horizontal portion located outside the oil tank housing 210 .
[0024] Preferably, the oil inlet pipe may be connected to an oil return filter 220, and the hydraulic oil returning from the outside of the hydraulic oil tank 200 may enter the oil return chamber through the oil inlet pipe and then through the oil return filter 220 to filter the hydraulic oil entering the oil return chamber.
[0025] The partition device 230 may include at least two partition parts arranged vertically. For example, the at least two partition parts may each have a bottom connected to the bottom of the oil tank and a top at least partially spaced apart from the top of the oil tank. The partition part divides the chamber defined by the oil tank housing 210 into an oil return chamber, an intermediate chamber, and an oil suction chamber. The gap spaced apart between the top of the partition part and the top of the oil tank forms a ventilation channel located above the oil return chamber, the intermediate chamber, and the oil suction chamber.
[0026] Preferably, the maximum allowable liquid level 240 of the oil return chamber is below the top of the partition portion, so that the hydraulic oil in the oil return chamber cannot overflow into the intermediate chamber through the top. A first opening 231 is formed on the first partition portion 233 that separates the oil return chamber and the intermediate chamber, so that the oil return chamber and the intermediate chamber are fluidically connected, and thus the hydraulic oil in the oil return chamber can flow into the intermediate chamber through the first opening 231. A second opening 232 is formed on the second partition portion 234 that separates the intermediate chamber and the oil suction chamber, so that the intermediate chamber and the oil suction chamber are fluidically connected, and thus the hydraulic oil in the intermediate chamber can flow into the oil suction chamber through the second opening 232. For example, in the vertical direction, the first opening 231 is located below the maximum allowable liquid level 240 to allow the hydraulic oil to flow into the intermediate chamber through the first opening 231, and the first opening 231 is located above the second opening 232. In other words, the vertical height distance of the first opening 231 relative to the bottom of the oil tank is smaller than the vertical height distance of the maximum allowable liquid level 240 relative to the bottom of the oil tank, and the vertical height distance of the first opening 231 relative to the bottom of the oil tank is greater than the vertical height distance of the second opening 232 relative to the bottom of the oil tank.
[0027] It should be understood that although Figure 2-6 2 shows that the partition device 230 includes only two partition parts, namely the first partition part 233 and the second partition part 234, but it is also conceivable that the at least two partition parts may also include one or more vertically arranged middle partition parts located between the first partition part and the second partition part to divide the intermediate chamber into two or more sub-filter chambers. Each middle partition part is provided with a filter port, so that the hydraulic oil entering the intermediate chamber through the first opening 231 flows into the adjacent sub-filter chambers through the filter port in sequence and finally flows out of the intermediate chamber through the second opening 232. For example, in the flow direction of the hydraulic oil flowing from the return oil chamber through each sub-filter chamber of the intermediate chamber into the oil suction chamber, the height positions of the first opening, each filter port and the second opening may be successively reduced. It is also feasible that the openings on those middle partition parts may have any suitable height position, which may be higher, equal to or lower than the first opening 231, or higher, equal to or lower than the second opening 232, as long as the first opening 231 can be higher than the second opening 232.
[0028] It is also conceivable that, as an alternative, the partition device 230 may be an integral part, which may define a cavity as an intermediate chamber inside it, and a first opening 231 is provided on the side of the cavity close to the oil return chamber and a second opening 232 is provided on the side of the cavity close to the oil suction chamber, all of which do not depart from the scope of protection of the present utility model.
[0029] With the hydraulic oil tank of this embodiment, since the first opening is lower than the maximum allowable liquid level 240, the gas above the hydraulic oil cannot enter the intermediate chamber through the first opening. In addition, since the gas entering the intermediate chamber through the first opening will transfer from bottom to top, by making the height of the second opening lower than the first opening, less gas can enter the oil suction chamber through the second opening, thereby filtering out a large number of bubbles, thereby effectively reducing the amount of gas entering the hydraulic system outside the hydraulic oil tank.
[0030] For example, the first opening 231 may be provided on the first partition plate at a middle area or a lower half area in the vertical direction with respect to the oil return chamber. For example, the vertical height distance of the highest oil inlet point of the first opening 231 relative to the bottom of the oil tank is 40% to 70% of the vertical height distance of the highest allowable liquid level 240 relative to the bottom of the oil tank.
[0031] For example, the vertical height distance of the lowest oil inlet point of the first opening 231 relative to the bottom of the oil tank is 35% to 65% of the vertical height distance of the highest allowable liquid level 240 relative to the bottom of the oil tank.
[0032] When the hydraulic oil returns to the oil return chamber through the oil inlet pipe, many bubbles will be generated. The bubbles will be generated around the oil return filter element 220. Since the density of gas is smaller than that of hydraulic oil, the generated bubbles will continue to accelerate upward transfer. Bubbles are a process of continuous generation and discharge from the oil surface. In this process, most of the bubbles will exist in the upper half of the oil return chamber. Since in this embodiment, the first opening 231 is arranged on the first partition part 233 in the middle area or the lower half area along the vertical direction of the oil return chamber, the hydraulic oil flowing from the first opening 231 into the middle chamber will filter out more than half of the bubbles. Further, when the hydraulic oil flows from the middle chamber to the oil suction chamber, since the height of the second opening 232 is lower than the first opening 231, and the bubbles are mainly concentrated in the middle and upper areas, the hydraulic oil flowing from the second opening 232 into the oil suction chamber will further filter the bubbles. Therefore, after double filtration by the first opening 231 and the second opening 232, the bubbles in the oil suction chamber have been greatly reduced compared with the oil return chamber, thereby effectively reducing the amount of gas entering the hydraulic system part outside the hydraulic oil tank.
[0033] For example, the second opening 232 may be provided on the second partition plate portion at a lower half region of the oil return chamber or the intermediate chamber in the vertical direction.
[0034] For example, the vertical height distance of the highest oil outlet point of the second opening 232 relative to the bottom of the oil tank may be 5% to 30% of the vertical height distance of the highest allowable liquid level 240 relative to the bottom of the oil tank.
[0035] For example, the vertical height distance of the lowest oil inlet point of the second opening 232 relative to the bottom of the oil tank may be 3% to 25% of the vertical height distance of the highest allowable liquid level 240 relative to the bottom of the oil tank.
[0036] In this way, when the hydraulic oil flows from the middle chamber to the oil suction chamber, since the height of the second opening 232 is located in the lower half area, and the bubbles are mainly concentrated in the middle and upper areas, the hydraulic oil flowing into the oil suction chamber from the second opening 232 will filter out more than half of the bubbles, which further improves the filtering effect of the second opening 232.
[0037] It should be understood that all “heights” used herein are measured in the vertical direction from the bottom of the inner cavity of the oil tank.
[0038] As used herein, the term “highest oil inlet point” refers to the position of the first opening 231 that has the largest vertical height distance from the bottom of the oil tank.
[0039] As used herein, the term “lowest oil inlet point” refers to the position of the first opening 231 that has the smallest vertical height distance from the bottom of the oil tank.
[0040] As used herein, the term “highest oil outlet point” refers to the position of the second opening 232 that has the largest vertical height distance from the bottom of the oil tank.
[0041] As used herein, the term “lowest oil outlet point” refers to a position of the second opening 232 that has the smallest vertical height distance from the bottom of the oil tank.
[0042] For example, the first opening 231 and the second opening 232 may each be an elongated opening extending in the horizontal direction. However, any other suitable shapes or forms are feasible, for example, the first opening 231 and / or the second opening 232 may be oval, circular, triangular, rectangular, diamond-shaped, etc. The first opening 231 and / or the second opening 232 may also be composed of a group of holes or openings, as long as they allow the hydraulic oil to pass therethrough.
[0043] The utility model also relates to a hydraulic system comprising the hydraulic oil tank 200 mentioned above.
[0044] Industrial Applicability
[0045] The hydraulic oil tank of the utility model and the hydraulic system comprising the hydraulic oil tank are suitable for filtering bubbles in the hydraulic oil tank of fuel machinery such as fuel vehicles and the like.
[0046] In summary, with the hydraulic oil tank 200 and the hydraulic system including the hydraulic oil tank 200 of the utility model, since the first opening 231 is lower than the maximum allowable liquid level 240, the gas above the hydraulic oil cannot enter the intermediate chamber through the first opening 231. In addition, since the gas entering the intermediate chamber through the second opening 232 will transfer from bottom to top, by making the height of the second opening 232 lower than the first opening 231, less gas can enter the oil suction chamber through the second opening 232, thereby filtering out a large number of bubbles. This effectively reduces the amount of gas entering the hydraulic system part outside the hydraulic oil tank.
[0047] Furthermore, in this document, the term "comprising" does not exclude other elements or steps. A single unit or step may fulfill the functions of several features recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage. The terms "about", "approximately" etc. in conjunction with an attribute or a value in particular also explicitly define the attribute or explicitly define the value, respectively. The term "about" in the context of a given value or range refers, for example, to a value or range within 20%, within 10%, within 5% or within 2% of the given value or range.
[0048] The embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the claims. It should be understood that various modifications or changes obvious to those skilled in the art are within the spirit and scope of the present application and the scope of the appended claims.
[0049] It will be clear that various modifications and / or improvements and / or combinations obvious to a person skilled in the art may be made to the various embodiments of the invention described above without departing from the scope of the invention as defined by the appended claims.
Claims
1. A hydraulic oil tank (200), comprising an oil tank shell (210), wherein a partition device (230) is arranged in the oil tank shell, characterized in that: The partition device includes at least two partition parts arranged vertically, and the partition parts divide the chamber defined by the oil tank shell into an oil return chamber, an intermediate chamber and an oil suction chamber, wherein a first opening (231) is formed on the first partition part (233) separating the oil return chamber and the intermediate chamber, so that the oil return chamber and the intermediate chamber are fluidically connected, and the maximum allowable liquid level (240) of the oil return chamber is lower than the top of the first partition part, and a second opening (232) is formed on the second partition part (234) separating the intermediate chamber and the oil suction chamber, so that the intermediate chamber and the oil suction chamber are fluidically connected, wherein in the vertical direction, the first opening (231) is located below the maximum allowable liquid level (240) and above the second opening (232).
2. The hydraulic oil tank (200) according to claim 1, characterized in that: The at least two partition parts also include one or more vertically arranged middle partition parts located between the first partition part and the second partition part to divide the intermediate chamber into two or more sub-filter chambers, and each middle partition part is provided with a filter port to allow the hydraulic oil entering the intermediate chamber through the first opening (231) to flow into adjacent sub-filter chambers through the filter port in sequence and finally flow out of the intermediate chamber through the second opening (232).
3. The hydraulic oil tank (200) according to claim 2, characterized in that: In the flow direction of the hydraulic oil flowing from the oil return chamber through the sub-filter chambers of the intermediate chamber into the oil suction chamber, the height positions of the first opening, the filter ports and the second opening are successively reduced.
4. The hydraulic oil tank (200) according to claim 1, characterized in that: The vertical height distance of the highest oil inlet point of the first opening (231) relative to the bottom of the oil tank is 40% to 70% of the vertical height distance of the highest allowable liquid level (240) relative to the bottom of the oil tank.
5. The hydraulic oil tank (200) according to claim 4, characterized in that: The vertical height distance of the lowest oil inlet point of the first opening (231) relative to the bottom of the oil tank is 35% to 65% of the vertical height distance of the maximum allowable liquid level (240) relative to the bottom of the oil tank.
6. The hydraulic oil tank (200) according to claim 4 or 5, characterized in that: The vertical height distance of the highest oil outlet point of the second opening (232) relative to the bottom of the oil tank is 5% to 35% of the vertical height distance of the highest allowable liquid level (240) relative to the bottom of the oil tank.
7. The hydraulic oil tank (200) according to any one of claims 1 to 5, characterized in that: The first opening (231) and the second opening (232) are each an elongated opening extending in the horizontal direction.
8. A hydraulic system comprising the hydraulic oil tank (200) according to any one of claims 1 to 7.