Hydraulic oil tank

Abstract

The utility model provides a hydraulic oil tank which comprises an oil tank body, a cleaning opening is formed in the top of the oil tank body, a flange cover is arranged on the cleaning opening, an air filter mounting opening is formed in the middle of the flange cover, and an air filter is arranged at the air filter mounting opening. An oil suction filter and an oil drainage pipeline are arranged on the side wall of the oil tank body and penetrate through the inner cavity from the outside of the oil tank body. The oil tank is compact in layout, miniaturization of the oil tank is achieved on the premise that the effective volume of the oil tank is met, the requirement for oil tank arrangement in a narrow space of a product is met, the oil suction filter is of a filter screen structure, the requirement for the oil suction vacuum degree of a system is improved, and hydraulic oil entering the system is subjected to defoaming treatment; the problem that oil return bubbles of a small-volume oil tank are insufficiently released is solved; an external oil port of the oil drainage pipeline is designed to be higher than the highest liquid level of hydraulic oil, a diversion pipeline is welded to the oil tank body, a 45-degree notch is formed in the bottom and faces the side wall of the oil tank, and the pipeline is inserted below the liquid level, so that turbulent flow caused by oil drainage / oil return is reduced, and air fusion is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery, and in particular to a hydraulic oil tank. Background Technology

[0002] Currently, crawler cranes typically use independent hydraulic oil tanks, usually located inside the turntable. The tank design must meet standards for tank capacity, structural layout, and tank accessories (suction oil filter, hydraulic gauge, air filter, etc.). For hydraulic oil tank volume, the traveling equipment is generally designed to have 0.5 to 1.5 times the pump flow rate. Typical crawler cranes have large turntable spaces, so there are no constraints on the hydraulic oil tank volume; the tank volume is generally designed to be at least 1.0 times the system pump flow rate. With product development, crane design places greater emphasis on lean design and human-centered design. Hydraulic oil tanks are generally located near large components such as engines and hydraulic pump units. The structural layout within the turntable must also consider the space requirements for maintenance access. Therefore, the design requirements for hydraulic oil tanks are becoming increasingly lean. Small-capacity hydraulic oil tanks meet the needs of a more human-centered spatial layout while also being more economical.

[0003] Existing oil tanks have a large overall volume, which has the advantage of a large span between the oil suction and return zones, allowing air bubbles in the return oil to be fully released in the suction zone. Due to the large tank volume, the oil impact caused by the drain port returning directly to the tank will not affect the oil suction. However, existing oil tanks have high requirements for layout space and require sufficient turntable space. When product space requires miniaturization of the oil tank, the following are the obvious technical disadvantages of existing oil tanks: 1) For oil tanks with pull-out filters, the lowest liquid level must be higher than the filter element, and the volume from the upper surface of the filter element to the oil suction port greatly limits the miniaturization of the oil tank; 2) The drain port returning directly to the tank above the hydraulic oil level causes oil impact and splashing. For small oil tanks, the defoaming ability is poor, which can easily cause excessive air to be introduced into the suction, resulting in abnormal oil suction noise in the system and cavitation on the pump. Similarly, if the drain port is arranged below the liquid level, it is inconvenient for maintenance, and the hydraulic oil cannot be blocked during pipeline maintenance. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a hydraulic oil tank.

[0005] To address the problems of existing technologies, this utility model discloses a hydraulic oil tank, including an oil tank body. The top of the oil tank body has a cleaning port, and the cleaning port is fitted with a flange cover. An air filter mounting port is located in the middle of the flange cover, and an air filter is installed in the air filter mounting port. The top of the oil tank body also has a return oil filter, which extends from the outside of the oil tank body into its inner cavity. A partition is located in the middle of the inner cavity of the oil tank body. The side walls of the oil tank body have a suction filter and a drain pipe, both of which extend from the outside of the oil tank body into its inner cavity.

[0006] Furthermore, the oil tank is equipped with a level gauge.

[0007] Furthermore, one end of the drain pipe is provided with an oil port, which is located outside the oil tank and is positioned above the maximum set hydraulic oil level; the other end of the drain pipe is a guide pipe, which extends into the inner cavity of the oil tank and is inserted below the hydraulic oil level.

[0008] Furthermore, the bottom of the flow guide pipe is provided with a 45° cut.

[0009] Furthermore, the oil suction filter includes an oil suction port and a filter screen connected as one piece. The oil suction port is located outside the oil tank body, and the filter screen is located inside the oil tank body.

[0010] Furthermore, the filter screen is cylindrical, with a plug at the end furthest from the oil inlet.

[0011] Furthermore, the filter screen has a pore diameter of Φ2mm.

[0012] Furthermore, the oil suction filter is located at the bottom of the side wall of the oil tank.

[0013] Furthermore, the upper part of the partition is provided with oil filter holes.

[0014] The beneficial effects of this utility model are:

[0015] The hydraulic oil tank of this utility model has a compact layout, which realizes the miniaturization of the oil tank while meeting the effective volume of the oil tank, meets the needs of oil tank arrangement in small spaces, improves the adaptability of the oil tank product, and meets the needs of lean product design.

[0016] The suction filter adopts a filter screen structure, which improves the vacuum degree required for system oil suction and defoams the hydraulic oil entering the system, solving the problem of insufficient release of air bubbles in the return oil from small-capacity oil tanks.

[0017] The external oil port of the drain pipe is designed to be higher than the highest hydraulic oil level. At the same time, the oil tank body is welded with a guide pipe, and the bottom is cut at a 45° angle with the cut facing the side wall of the oil tank. The pipe is inserted below the liquid level to reduce turbulence caused by draining / returning oil and effectively reduce the incorporation of air. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the oil drain pipe structure in this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0021] like Figure 1 As shown, a hydraulic oil tank includes an oil tank body 1. The top of the oil tank body 1 is provided with a cleaning port. The cleaning port is provided with a flange cover 2. The middle of the flange cover 2 is provided with an air filter installation port. The air filter installation port is provided with an air filter 3. The cleaning port and the air filter installation port are combined into one unit by the flange cover 2, which satisfies the arrangement of the cleaning port and the air filter installation port in a limited space.

[0022] The top of the oil tank 1 is also equipped with a return oil filter 4, which extends from the outside of the oil tank 1 into its inner cavity. A partition 5 is located in the middle of the inner cavity of the oil tank 1. An oil suction filter 7 and an oil drain pipe 8 are located on the side wall of the oil tank 1, both extending from the outside of the oil tank 1 into its inner cavity. A level gauge 6 is located on the outside of the oil tank 1, and the level gauge 6 is connected to the inner cavity of the oil tank 1. The oil suction filter 7 is located at the bottom of the side wall of the oil tank 1. The upper part of the partition 5 has oil filter holes.

[0023] The oil suction filter 7 includes an integrated oil suction port and a filter screen. The oil suction port is located outside the oil tank 1, and the filter screen is located inside the oil tank 1. The filter screen is cylindrical, with a plug at the end furthest from the oil suction port. The filter screen has a pore diameter of Φ2mm. The overall effective oil flow area is designed based on the maximum oil suction capacity of the system, and the flow area is designed to be at least 1.25 times the area of ​​the oil suction pipe. The filter screen is integrally welded to the oil suction port, and the sufficient reserved flow area eliminates the need for filter screen maintenance. The Φ2mm pore size design improves the vacuum requirement of the system's oil suction and defoams the hydraulic oil entering the system, solving the problem of insufficient release of air bubbles in the return oil from small-volume oil tanks.

[0024] like Figure 2 As shown, one end of the drain pipe 8 has an oil port located outside the oil tank 1, above the maximum set hydraulic oil level. The other end of the drain pipe 8 is a guide pipe 8-2, which extends into the inner cavity of the oil tank 1 and is inserted below the hydraulic oil level. The bottom of the guide pipe 8-2 has a 45° cut. The cut faces the side wall of the oil tank. Because the guide pipe 8-2 is inserted below the liquid level, it reduces turbulence caused by draining / returning oil, effectively reducing air incorporation.

[0025] When the hydraulic system is working, hydraulic oil is drawn into the hydraulic pump through the suction filter 7, and the return oil from each actuator returns to the inner cavity of the oil tank 1 through the return oil filter 4. At the same time, the drain oil enters the inner cavity of the oil tank 1 through the drain pipe 8. The return oil is buffered by the baffle 5 and enters the suction area for circulation. This utility model can meet the working requirements of the hydraulic system while satisfying the miniaturization of the oil tank.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, in the accompanying drawings of this utility model, the filling pattern is only used to distinguish the layers and is not used for any other limitation.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A hydraulic oil tank, comprising a tank body (1), characterized in that, The top of the oil tank (1) is provided with a cleaning port, the cleaning port is provided with a flange cover (2), the middle of the flange cover (2) is provided with an air filter installation port, the air filter installation port is provided with an air filter (3); the top of the oil tank (1) is also provided with a return oil filter (4), the return oil filter (4) extends from the outside of the oil tank (1) to the inner cavity; the middle of the inner cavity of the oil tank (1) is provided with a partition (5); the side wall of the oil tank (1) is provided with an oil suction filter (7) and an oil drain pipe (8), the oil suction filter (7) and the oil drain pipe (8) both extend from the outside of the oil tank (1) to the inner cavity.

2. The hydraulic oil tank according to claim 1, characterized in that, The oil tank (1) is equipped with a level gauge (6).

3. The hydraulic oil tank according to claim 1, characterized in that, One end of the drain pipe (8) is provided with an oil port (8-1), which is located outside the oil tank (1) and is higher than the maximum set hydraulic oil level. The other end of the drain pipe (8) is a guide pipe (8-2), which extends into the inner cavity of the oil tank (1) and is inserted below the hydraulic oil level.

4. The hydraulic oil tank according to claim 3, characterized in that, The bottom of the flow guide pipe (8-2) has a 45° cut.

5. The hydraulic oil tank according to claim 1, characterized in that, The oil suction filter (7) includes an oil suction port and a filter screen connected as one piece. The oil suction port is located outside the oil tank body (1), and the filter screen is located inside the oil tank body (1).

6. The hydraulic oil tank according to claim 5, characterized in that, The filter screen is cylindrical, with a plug at the end furthest from the oil inlet.

7. The hydraulic oil tank according to claim 5, characterized in that, The filter screen has a pore diameter of Φ2mm.

8. The hydraulic oil tank according to claim 1, characterized in that, The oil suction filter (7) is located at the bottom of the side wall of the oil tank (1).

9. The hydraulic oil tank according to claim 1, characterized in that, The upper part of the partition (5) is provided with oil filter holes.

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