Oil return filter and oil tank using the same

Abstract

The utility model discloses a return oil filter, including a return oil filter element, the bottom of the return oil filter element is connected to a protective filter element, a connecting component is arranged between the return oil filter element and the protective filter element, a one-way conduction device is arranged in the connecting component, and the pressure relief function can be played when the oil pressure inside the return oil filter element increases, so as to prevent the return oil filter element from being damaged and causing oil leakage. The utility model also discloses an oil tank using the above return oil filter, including a filter oil chamber and an oil storage chamber, the filter oil chamber accommodates the return oil filter, the inner side wall of the filter oil chamber is provided with a bubble removal partition, a cover plate is arranged at a position of the oil tank shell corresponding to the filter oil chamber, a breathing valve is arranged on the cover plate, and the oil is connected to the oil tank from the return oil port on the upper side of the oil tank, and is discharged from the oil suction port after filtering. The return oil filter and the oil tank have simple structures, more convenient replacement steps, high filtering accuracy and greatly improved filtering efficiency.

Description

Technical Field

[0001] The utility model belongs to the technical field of filtering equipment, in particular to an oil return filter and an oil tank using the same. Background Art

[0002] For the oil return device, in order to prevent the hydraulic oil from bringing impurities into the oil tank during the oil return process, a filter is installed in the oil return pipeline. However, the oil flow direction of the traditional oil return filter glass fiber filter element is from outside to inside, such as Figure 1 As shown, the oil tank is the filter housing, which requires pressure-resistant structural strength; and there are pollutants deposited in the oil return area, and once the filter element is replaced, the oil needs to be drained and thoroughly cleaned; after the one-way conduction device is turned on, the pollutants directly enter the oil suction area, and the oil suction area also needs to be drained and cleaned after the filter element is replaced. The oil suction filter is a negative pressure form, so the filtration accuracy is low and the filtration area is large. In order to solve the above problems, we proposed an oil return filter and an oil tank using it. Summary of the invention

[0003] In order to reduce the cost of the oil return filter system, simplify the maintenance process and improve the filtering efficiency, the utility model invents an oil return filter and an oil tank using the same.

[0004] The utility model adopts the following technical solutions:

[0005] A return oil filter and an oil tank using the same, comprising a cylindrical return oil filter element and a protective filter element, the return oil filter element and the protective filter element are longitudinally connected, a connecting member is arranged between the two, a mounting portion is arranged on the periphery of the connecting member, a conducting portion is arranged in the middle, the cross section of the mounting portion is an I-shaped structure, and the upper and lower sides thereof are respectively mounting grooves for installing the return oil filter element and the protective filter element, the conducting portion is a "J"-shaped structure, and an oil inlet hole is arranged on the top surface, a filter layer with the same filter material as the return oil filter element is arranged on the oil inlet hole, a one-way conducting device is connected by bolts through a central opening of the conducting portion of the connecting member, both sides of the conducting portion of the connecting member are dirt accumulation areas of the return oil filter element, oil flows from the inside of the return oil filter element to the outside through filtration, and when the return oil filter element is working normally, the one-way conducting device is in a closed state.

[0006] Preferably, the one-way conduction device includes a spring, which is installed in a cross-shaped frame of the connecting component by bolts. Spacer 1 and spacer 2 of corresponding sizes are arranged on the upper and lower surfaces of the spring. Spacer 1 blocks the oil inlet hole under the action of the spring, and spacer 2 fixes the spring under the limitation of a nut. The sensitivity of the one-way conduction device can be controlled by adjusting the tightness of the nut.

[0007] Preferably, the spring adopts an inverted conical structure to increase the flow area of ​​the oil.

[0008] Preferably, the oil return filter element and the protection filter element are fixed by a filter element axial load tie rod.

[0009] Preferably, the filter material of the oil return filter element is 10 μm glass fiber, and the filter material of the protection filter element is 50 μm stainless steel.

[0010] The utility model also provides an oil tank, comprising the above-mentioned filter.

[0011] Preferably, the oil tank includes an oil tank shell, in which an oil filter chamber and an oil storage chamber are arranged in parallel, a bubble removal baffle is arranged on the side wall of the oil filter chamber, an oil return filter is arranged inside the oil filter chamber, an oil return port is arranged on the side of the oil tank shell, the oil return port is connected to the upper end of the oil return filter element through a connecting pipe, an oil tank cover is arranged on the top of the oil tank shell corresponding to the oil filter chamber, a breathing valve is arranged on the oil tank cover, and an oil suction port is arranged at the bottom of the oil tank.

[0012] Preferably, quick-release chucks are used at the connection points at both ends of the connecting pipe connecting the oil return port and the oil return filter element.

[0013] The utility model has the following advantages:

[0014] By utilizing the technical solution of the utility model, when the filter is filtering, the oil flow direction of the glass fiber filter element of the return oil filter is from the inside to the outside, and the oil tank does not need to have pressure-resistant structural strength after the filter element outer frame is under pressure; large particle pollutants gather in the dirt accumulation area inside the return oil filter element, and the oil tank does not need to be drained to clean the oil tank when the filter element is replaced; the return oil passes through the integrated sequential structure of the glass fiber filter element and the stainless steel filter element, and after the one-way conduction device is turned on, the pollutants are first filtered by the 10μm filter material at the oil inlet hole, and then filtered by the 50μm stainless steel filter element. Since the 50-micron stainless steel filter element is in a positive pressure form, the filtration accuracy can be increased to 50μm, the filtration area of ​​the filter element can be reduced, and there is no need to add an oil suction filter. Therefore, the technical solution of the utility model solves the problems of complex filter structure, cumbersome replacement steps, poor filtration accuracy and low filtration efficiency in engineering machinery in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of installing a filter in the prior art is shown;

[0016] Figure 2 A schematic diagram of the oil return filter of the utility model is shown;

[0017] Figure 3 An enlarged view of the one-way conduction device of the utility model is shown;

[0018] Figure 4 A schematic diagram of a connecting member of the utility model is shown;

[0019] Figure 5 The figure shows the assembly diagram of the filter of the utility model installed in the oil filter cavity;

[0020] Among them, 91-return oil filter element, 92-oil suction filter element, 93-oil tank, 94-oil tank pressure filter housing; 1-return oil filter element, 11-connection device, 111-installation groove, 112-oil inlet hole, 2-protection filter element, 3-one-way guide device, 31-spring, 32-spacer one, 33-spacer two, 34-bolt, 4-filter element axial load pull rod, 5-dirt accumulation area, 6-oil tank, 61-return oil port, 62-oil suction port, 63-oil tank cover, 64-breathing valve, 65-filter oil chamber, 66-oil storage chamber, 7-connecting pipe, 71-quick release chuck, 8-bubble removal partition. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 2 As shown, the filter of this embodiment includes a cylindrical return oil filter element 1 and a protective filter element 2 longitudinally connected to the bottom of the return oil filter element 1, and a connecting component 11 is arranged between the return oil filter element 1 and the protective filter element 2, and the connecting component 11 is connected to the one-way conduction device 3.

[0023] like Figure 4 As shown, the connecting member 11 is a "J"-shaped structure, including an outer mounting portion and a middle conducting portion, the cross section of the mounting portion is an I-shaped structure, the return oil filter element 1 and the protection filter element 2 are respectively nested in the mounting grooves 111 on the upper and lower sides, and the mounting grooves 111 are tightly connected to the connection of the filter element to prevent leakage of oil from the return oil filter element 1 to the protection filter element 2. The conducting portion of the connecting member 11 is fixedly connected to the one-way conducting device 3 by bolts 34, and a dirt accumulation area 5 is formed between the two sides of the conducting portion and the return oil filter element 1.

[0024] A layer of 10 μm filter material is arranged on the top surface of the connecting member 11, and an oil inlet hole 112 is opened on the top surface of the conducting part around the central bolt hole. After the one-way conducting device 3 is opened, the oil is first filtered by the filter material on the top surface of the connecting member 11, and then enters the protective filter element 2 through the oil inlet hole 112 on the top surface of the conducting part of the connecting member 11.

[0025] like Figure 3As shown, the one-way conductive device 3 includes a spring 31 with an inverted cone structure, which is connected to the connecting member 11 by bolts. The larger side of the bottom surface of the spring 31 is fitted with the inner top surface of the conductive part of the connecting member 11, and a spacer 32 is arranged at the fitting position. A spacer 2 33 is arranged above the bottom nut to support the spring 31. The spacer 1 32 blocks the oil inlet hole 112 on the connecting member 11 under the action of the spring 31. The sensitivity of the one-way conductive device 3 can be adjusted by adjusting the tightness of the bottom nut.

[0026] The return oil filter element 1 and the protection filter element 2 are fixedly connected by the filter element axial load pull rod 4. The oil is connected from the top of the return oil filter element 1, and the oil is filtered from the inside of the return oil filter element 1 to the outside through the oil pressure. After the return oil filter element 1 has worked for a period of time, the return oil filter element 1 will intercept impurities inside the filter element and precipitate them in the dirt accumulation area 5. When the oil flow rate of the return oil filter element 1 gradually decreases during use, causing the internal oil pressure to increase, the one-way conduction device 3 is opened under the push of the oil pressure, and the protection filter element 2 is activated at this time.

[0027] The filter material of the return oil filter element 1 is 10μm glass fiber filter material, and the filter material of the protection filter element 2 is 50μm stainless steel filter material. 10μm glass fiber filter material is also used at the connection between the bottom of the return oil filter element 1 and the connecting mechanism 11. Even after the one-way conduction device 3 is turned on, the filtered impurities in the return oil filter element 1 will not flow into the protection filter element 2.

[0028] like Figure 5 The embodiment shown also provides an oil tank, the oil tank adopts the above-mentioned return oil filter inside, the oil tank shell 6 is provided with a filter oil chamber 65 and an oil storage chamber 66 in parallel, the side wall of the filter oil chamber 65 is provided with a bubble removal partition 8, the filter oil chamber 65 is provided with a return oil filter, the side of the oil tank shell 6 is provided with a return oil port 61, the return oil port 61 is connected to the upper end of the return oil filter element 1 through a connecting pipe 7, the top of the oil tank shell 6 is provided with an oil tank cover 63 corresponding to the filter oil chamber 65, the oil tank cover 63 is provided with a breathing valve 64, and the bottom of the oil tank shell 6 is provided with an oil suction port 62. The opening of the return oil filter element 1 on the return oil filter is connected to the return oil port 61 through a connecting pipe 7, and quick-release chucks 71 are provided at both ends of the connecting pipe 7 to facilitate the replacement of the filter.

[0029] The working method is:

[0030] like Figure 5As shown, the oil enters the return oil filter element 1 at the upper part of the return oil filter through the return oil port 61 and the connecting pipe 7. After the oil enters the return oil filter element 1, it flows into the filter oil chamber 65 through the filter from the inside of the return oil filter element 1 under the action of oil pressure. When the oil level in the filter oil chamber 65 rises to the highest point of the bubble removal baffle 8, it flows into the oil storage chamber 66. The oil suction port 62 set at the bottom of the oil storage chamber 66 discharges the oil. The impurities in the oil are first filtered through the return oil filter element 1 to the dirt accumulation area 5. The filtered oil is deposited in the filter oil chamber 65 as sediment to the bottom of the filter oil chamber 65. After the filter oil chamber 65 reaches an overflowing state, the bubble removal baffle 8 also completes the removal of the oil bubbles in the filter oil chamber 65.

[0031] As the amount of oil filtered by the return oil filter element 1 increases, the permeability of the oil in the filter material decreases, causing the internal oil pressure of the return oil filter element 1 to gradually increase. At this time, the pressure pushes the one-way conduction device 3 to open, and the oil enters the protective filter element 2 and then releases the pressure, preventing the return oil filter element 1 from being damaged due to excessive internal pressure and leaking unfiltered oil. At this time, the user can judge that the return oil filter element 1 has reached the maximum service life based on the external pressure gauge, so that the filter element can be replaced in time.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A return oil filter, comprising: a return oil filter element (1), characterized in that: The bottom of the return oil filter element (1) is longitudinally connected to the protective filter element (2), a connecting member (11) is provided between the return oil filter element (1) and the protective filter element (2), a mounting portion is provided on the periphery of the connecting member (11), and a conducting portion is provided in the middle, the cross section of the mounting portion is an I-shaped structure, and the upper and lower sides thereof are mounting grooves (111) for mounting the return oil filter element (1) and the protective filter element (2), the conducting portion is an I-shaped structure, and an oil inlet hole (112) is provided on the top surface, and a filter layer having the same filter material as the return oil filter element (1) is provided on the oil inlet hole (112), a one-way conducting device (3) is connected to the central opening of the conducting portion of the connecting member (11) by bolts (34), the two sides of the conducting portion of the connecting member (11) are dirt accumulation areas (5) of the return oil filter element (1), and oil flows from the inside of the return oil filter element (1) to the outside through filtration, and when the return oil filter element (1) is working normally, the one-way conducting device (3) is in a closed state.

2. The oil return filter according to claim 1, characterized in that: The one-way conducting device (3) comprises a spring (31) which is mounted in a cross-shaped frame of a conducting portion of a connecting member (11) by means of bolts (34). A spacer piece 1 (32) and a spacer piece 2 (33) of corresponding sizes are arranged on upper and lower surfaces of the spring (31). The spacer piece 1 (32) blocks the oil inlet hole (112) under the action of the spring (31). The spacer piece 2 (33) fixes the spring (31) under the restriction of a nut. The sensitivity of the one-way conducting device (3) can be controlled by adjusting the tightness of the nut.

3. The oil return filter according to claim 2, characterized in that: The spring (31) is an inverted conical structure, which increases the flow area of ​​the oil.

4. The oil return filter according to claim 3, characterized in that: The oil return filter element (1) and the protective filter element (2) are fixed by a filter element axial load tie rod (4).

5. An oil return filter according to any one of claims 1 to 4, characterized in that: The filter material of the oil return filter element (1) is 10 μm glass fiber, and the filter material of the protection filter element (2) is 50 μm stainless steel.

6. A fuel tank, characterized in that: An oil return filter as claimed in claim 5 is arranged in the oil tank.

7. A fuel tank as claimed in claim 6, characterized in that: The oil tank comprises an oil tank shell (6), wherein an oil filter chamber (65) and an oil storage chamber (66) are arranged in parallel in the oil tank shell (6), a bubble removal partition (8) is arranged on the side wall of the oil filter chamber (65), an oil return filter is arranged inside the oil filter chamber (65), an oil return port (61) is arranged on the side of the oil tank shell (6), the oil return port (61) is connected to the upper end of the oil return filter element (1) through a connecting pipe (7), an oil tank cover plate (63) is arranged at the top of the oil tank shell (6) corresponding to the oil filter chamber (65), a breathing valve (64) is arranged on the oil tank cover plate (63), and an oil suction port (62) is arranged at the bottom of the oil tank shell (6).

8. A fuel tank as claimed in claim 7, characterized in that: The connection points at both ends of the connecting pipe (7) connecting the oil return port (61) and the oil return filter element (1) use quick-release chucks (71).

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