Hydraulic oil tank with filter element blockage alarming function and excavator

Abstract

The utility model relates to the field of hydraulic pump stations, and discloses a hydraulic oil tank with a filter element blocking alarm function and an excavator. The hydraulic oil tank comprises an oil return cavity provided with an oil return opening used for inputting hydraulic oil; the oil suction cavity is provided with an oil suction port for outputting hydraulic oil; the filter element is communicated with the oil return cavity and the oil suction cavity; two ends of the first communicating pipe are respectively communicated with the oil return cavity and the oil suction cavity from the outside of the hydraulic oil tank; the sensor is arranged on the first communicating pipe and used for detecting the pressure difference between the two ends of the first communicating pipe. The excavator adopts the hydraulic oil tank. The pressure difference is obtained from the oil return cavity before passing through the filter element and the oil suction cavity after passing through the filter element through the sensor and the first communicating pipe, whether the filter element is blocked or not is accurately judged, the device is independent of the filter element, no additional requirement is needed for arrangement of the filter element, replacement with the filter element is not needed, and therefore the alarm problem when the filter element of the hydraulic oil tank is blocked is solved; the effects of flexible layout and low use cost are achieved.

Description

Technical Field

[0001] The present application belongs to the field of engineering machinery, and specifically relates to a hydraulic oil tank and an excavator with a filter element clogging alarm. Background Art

[0002] Hydraulic oil contamination is a major cause of hydraulic system failure. At present, filter elements are generally used to filter impurities from the hydraulic oil that flows back to the hydraulic oil tank. After the filter element has been working for a period of time, impurities will accumulate on the filter element, causing the filter element to be blocked and need to be replaced in time. In the prior art, a signal device is integrated on a filter element. When the signal device detects that the filter element is blocked, it will automatically send out an alarm signal to remind the user to replace it in time. However, the outer volume of the filter element is increased, and more assembly space is required for the hydraulic oil tank; and for a hydraulic oil tank with multiple filter elements, each filter element with an integrated signal device needs to be replaced one by one, and the cost of replacing the filter element is high. Utility Model Content

[0003] The purpose of the present application is to provide a hydraulic oil tank and an excavator with a filter element blockage alarm, which are used to solve the alarm problem when the filter element of the hydraulic oil tank is blocked, and achieve the effects of flexible layout and low cost of use.

[0004] In order to achieve the above-mentioned purpose, the present application provides a hydraulic oil tank with a filter element clogging alarm, comprising:

[0005] The oil return chamber is provided with an oil return port for inputting hydraulic oil;

[0006] The oil suction chamber is provided with an oil suction port for outputting hydraulic oil;

[0007] A filter element connecting the oil return chamber and the oil suction chamber;

[0008] A first connecting pipe, two ends of which are connected to the oil return chamber and the oil suction chamber from the outside of the hydraulic oil tank respectively;

[0009] The sensor is arranged on the first communicating pipe and is used to detect the pressure difference between the two ends of the first communicating pipe.

[0010] In some embodiments, the sensor is a pressure differential switch, and a switch contact of the pressure differential switch is closed after the pressure difference reaches a preset value.

[0011] In some embodiments, a fixing seat is provided on the outer wall of the hydraulic oil tank, and the sensor is mounted on the fixing seat using fasteners.

[0012] In some embodiments, the first connecting pipe includes a first pipe interface, a second pipe interface and a hose, and the first pipe interface, the sensor, the hose and the second pipe interface are connected in sequence.

[0013] In some embodiments, a plurality of partition plates are disposed inside the hydraulic oil tank, and the partition plates and the wall surface of the hydraulic oil tank respectively form the oil return chamber and the oil suction chamber.

[0014] In some embodiments, the filter element is disposed in the oil return chamber, and the filter element is a hollow structure, the interior of which is connected to the oil suction chamber pipeline.

[0015] In some embodiments, a second connecting pipe is provided inside the hydraulic oil tank, one end of the second connecting pipe extends into the interior of the filter element, and the other end of the second connecting pipe extends into the oil suction cavity.

[0016] In some embodiments, a reinforcing rib is provided at a connection between the second connecting pipe and the wall of the oil return chamber.

[0017] In some embodiments, the hydraulic oil tank further includes a bypass valve disposed on the filter element, and the bypass valve connects the oil return chamber and the oil suction chamber when the bypass valve is turned on.

[0018] A second aspect of the present application provides an excavator, which adopts the above-mentioned hydraulic oil tank with filter clogging alarm.

[0019] Compared with the prior art, the beneficial effects of this application are:

[0020] The present application obtains the pressure difference from the oil return chamber in front of the filter element and the oil suction chamber behind the filter element through a sensor and a first connecting pipe, accurately determines whether the filter element is blocked, and is independent of the filter element. There is no additional requirement for the arrangement of the filter element, and it does not need to be replaced together with the filter element, thereby solving the alarm problem when the filter element of the hydraulic oil tank is blocked, achieving a flexible layout and low cost of use.

[0021] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without creative work. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the hydraulic oil tank according to a specific implementation method of the present application with part of the wall hidden.

[0024] Figure 2 This is a front view of a hydraulic oil tank according to a specific embodiment of the present application.

[0025] Explanation of reference numerals: oil return chamber 1, oil return port 11, oil suction chamber 2, oil suction port 21, filter element 3, first connecting pipe 4, sensor 5, fixing seat 6, partition plate 7, second connecting pipe 8, bypass valve 9. DETAILED DESCRIPTION

[0026] The specific implementation of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present application, and is not used to limit the present application.

[0027] like Figure 1 , Figure 2 As shown, a hydraulic oil tank with a filter element clogging alarm includes: an oil return chamber 1, provided with an oil return port 11 for inputting hydraulic oil; an oil suction chamber 2, provided with an oil suction port 21 for outputting hydraulic oil; a filter element 3, connecting the oil return chamber 1 and the oil suction chamber 2; a first connecting pipe 4, both ends of which are connected to the oil return chamber 1 and the oil suction chamber 2 from the outside of the hydraulic oil tank respectively; a sensor 5, arranged on the first connecting pipe 4, for detecting the pressure difference at both ends of the first connecting pipe 4.

[0028] In the present application, the hydraulic oil enters the oil return chamber 1 through the oil return port 11, then passes through the filter element 3 to filter impurities and flows into the oil suction chamber 2, and finally leaves the oil suction chamber 2 through the oil suction port 21. The two ends of the first connecting pipe 4 can obtain the pressure of the oil return chamber 1 and the pressure of the oil suction chamber 2 respectively, and the sensor 5 is used to sense the pressure difference between the two. As the impurities on the filter element 3 increase, the pressure of the oil return chamber 1 will gradually be greater than the pressure of the oil suction chamber 2; when the pressure difference between the two reaches a preset value, that is, the surface filter element 3 is blocked, the sensor 5 can output an alarm signal to the outside, thereby solving the alarm problem when the filter element 3 of the hydraulic oil tank is blocked. Since the sensor 5 and the first connecting pipe 4 obtain the pressure difference from the oil return chamber 1 and the oil suction chamber 2, they are independent of the filter element 3, and there is no additional requirement for the arrangement of the filter element 3, and it does not need to be replaced together with the filter element 3, thereby achieving a flexible layout and low cost of use. In addition, the first connecting pipe 4 and the sensor 5 are both arranged outside the hydraulic oil tank, which is convenient for installation and replacement, and can also be flexibly arranged according to the actual assembly situation of the hydraulic oil tank.

[0029] Specifically, the sensor 5 is a pressure difference switch, and the switch contact of the pressure difference switch closes after the pressure difference reaches a preset value. The closing of the switch contact can output a switch signal as an alarm signal.

[0030] Those skilled in the art will appreciate that the present application is not limited to the above-mentioned pressure differential switch, but may also be a pressure sensor, etc. Other structural forms capable of sensing the pressure difference between two paths should also fall within the protection scope of the present application.

[0031] Specifically, the first connecting pipe 4 includes a first pipe interface, a second pipe interface and a hose, and the first pipe interface, the sensor 5, the hose and the second pipe interface are connected in sequence.

[0032] Specifically, a fixing seat 6 is provided on the outer wall of the hydraulic oil tank, and the fixing seat 6 is used to install the sensor 5 using fasteners.

[0033] In some embodiments, through holes are respectively provided on the outer walls of the oil return chamber 1 and the oil suction chamber 2 of the hydraulic oil tank. One end of the pipe interface is installed on the through hole through an O-ring; the high-pressure interface of the differential pressure switch is connected to the other end of the first pipe interface, and the low-pressure interface is connected to one end of the hose; the other end of the hose is connected to the other end of the second pipe interface. The fixing seat 6 is welded on the outer wall of the oil return chamber 1. The switch contacts of the differential pressure switch are disconnected by default. As the operating time of the hydraulic system increases, the impurities on the filter element 3 gradually increase, causing the pressure difference between the oil return chamber 1 and the oil suction chamber 2 to gradually increase. When the pressure difference increases to the preset value set by the pressure switch, the switch contacts of the pressure switch are closed, thereby generating an alarm signal to remind the user to replace the filter element 3.

[0034] Specifically, a plurality of partition plates 7 are provided inside the hydraulic oil tank, and the partition plates 7 and the wall surface of the hydraulic oil tank form an oil return chamber 1 and an oil suction chamber 2 respectively.

[0035] Specifically, the filter element 3 is arranged in the oil return chamber 1. The filter element 3 is a hollow structure, and its interior is connected to the oil suction chamber 2 through a pipeline. The hydraulic oil in the oil return chamber 1 is filtered from the outside of the filter element 3 to the inside to filter impurities. The filtered hydraulic oil in the filter element 3 flows into the oil suction chamber 2 through the pipeline.

[0036] Specifically, a second connecting pipe 8 is provided inside the hydraulic oil tank, one end of the second connecting pipe 8 extends into the interior of the filter element 3 , and the other end of the second connecting pipe 8 extends into the oil suction chamber 2 .

[0037] Furthermore, a reinforcing rib is provided at the connection between the second connecting pipe 8 and the wall surface of the oil return chamber 1 .

[0038] Specifically, the hydraulic oil tank further includes a bypass valve 9 disposed on the filter element 3. When the bypass valve 9 is turned on, the return oil chamber 1 is connected to the oil suction chamber 2. The bypass valve 9 is closed by default, and the hydraulic oil can only enter the oil suction chamber 2 through the filter element 3. When the filter element 3 is blocked, the pressure in the return oil chamber 1 increases sharply. In order to enable the hydraulic system to continue to work, part of the hydraulic oil is not filtered by the filter element 3, but enters the filter element 3 from the turned on bypass valve 9, and then flows into the oil suction chamber 2.

[0039] In some embodiments, the return oil chamber 1 is located above the hydraulic oil tank, and the return oil port 11 is located on the side wall of the return oil chamber 1. The suction oil chamber 2 is located below the hydraulic oil tank, and the suction oil port 21 is located on the bottom wall of the suction oil chamber 2. The partition plate 7 is welded to the wall of the hydraulic oil tank, and the partition plates 7 are welded to each other to form multiple chambers inside the hydraulic oil tank including the return oil chamber 1 and the suction oil chamber 2. Multiple filter elements 3 are vertically distributed in parallel in the return oil chamber 1. An end cover is provided on the top of the return oil chamber 1. After opening the end cover, the filter element 3 can be taken out upward for replacement. The upper end of the second connecting pipe 8 passes through the bottom wall of the return oil chamber 1 and extends into the interior of the filter element 3; the lower end of the second connecting pipe 8 passes through the top wall of the suction oil chamber 2 and extends into the suction oil chamber 2. The second connecting pipe 8 is welded to the bottom wall of the return oil chamber 1, and a number of reinforcing ribs are added at the welding point to enhance the connection strength.

[0040] An excavator adopts the hydraulic oil tank with filter element clogging alarm.

[0041] In the description of the present application, it should be understood that 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, 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, an electrical connection, or communication with each other; 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 this application can be understood according to specific circumstances.

[0043] 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 present application. 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.

[0044] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A hydraulic oil tank with filter element clogging alarm, characterized in that: The hydraulic oil tank comprises: The oil return chamber (1) is provided with an oil return port (11) for inputting hydraulic oil; The oil suction chamber (2) is provided with an oil suction port (21) for outputting hydraulic oil; A filter element (3) connecting the oil return chamber (1) and the oil suction chamber (2); A first connecting pipe (4), both ends of which are connected to the oil return chamber (1) and the oil suction chamber (2) from the outside of the hydraulic oil tank; A sensor (5) is arranged on the first connecting pipe (4) and is used to detect the pressure difference between the two ends of the first connecting pipe (4).

2. The hydraulic oil tank with filter element clogging alarm according to claim 1 is characterized in that: The sensor (5) is a pressure difference switch, and the switch contacts of the pressure difference switch are closed after the pressure difference reaches a preset value.

3. The hydraulic oil tank with filter element clogging alarm according to claim 1, characterized in that: The outer wall of the hydraulic oil tank is provided with a fixing seat (6), and the fixing seat (6) uses a fastener to mount the sensor (5).

4. The hydraulic oil tank with filter element clogging alarm according to claim 1, characterized in that: The first connecting pipe (4) comprises a first pipe interface, a second pipe interface and a hose, and the first pipe interface, the sensor (5), the hose and the second pipe interface are connected in sequence.

5. The hydraulic oil tank with filter element clogging alarm according to claim 1, characterized in that: A plurality of partition plates (7) are arranged inside the hydraulic oil tank, and the partition plates (7) and the wall surface of the hydraulic oil tank respectively form the oil return chamber (1) and the oil suction chamber (2).

6. The hydraulic oil tank with filter element clogging alarm according to claim 1, characterized in that: The filter element (3) is arranged in the oil return chamber (1); the filter element (3) is a hollow structure, and its interior is connected to the pipeline of the oil suction chamber (2).

7. The hydraulic oil tank with filter element clogging alarm according to claim 6, characterized in that: A second connecting pipe (8) is provided inside the hydraulic oil tank, one end of the second connecting pipe (8) extends into the interior of the filter element (3), and the other end extends into the oil suction chamber (2).

8. The hydraulic oil tank with filter element clogging alarm according to claim 7, characterized in that: A reinforcing rib is provided at the connection between the second connecting pipe (8) and the wall surface of the oil return chamber (1).

9. The hydraulic oil tank with filter element clogging alarm according to claim 6, characterized in that: The hydraulic oil tank further comprises a bypass valve (9) arranged on the filter element (3); when the bypass valve (9) is turned on, the oil return chamber (1) is connected to the oil suction chamber (2).

10. An excavator, characterized in that: A hydraulic oil tank with a filter element clogging alarm as claimed in any one of claims 1 to 9 is used.

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