A central tube, metal-free environmentally friendly filter element and spin-on filter

Abstract

The present invention relates to a central tube, which comprises an inner tube (1) and an outer tube (2) which are coaxially sleeved and connected at the bottom, a gap is provided between the inner tube (1) and the outer tube (2), a plurality of filter windows (3) are provided on the side wall of the outer tube (2), the side wall of the inner tube (1) is a continuous structure, and the height of the inner tube (1) is lower than the height of the outer tube (2); the present invention also relates to a metal-free environmentally friendly filter element and a spin-on filter having the central tube. Compared with the prior art, the present invention has the advantages of simple structure, high filtering efficiency, wide application range, safety and reliability, and long service life.

Description

Technical Field

[0001] The present invention belongs to the field of oil filters, and relates to a center tube, a metal-free environmentally friendly filter element and a spin-on filter, and in particular to a double-layer center tube, a metal-free environmentally friendly filter element using the double-layer center tube, and a spin-on filter using the double-layer center tube. Background Art

[0002] At present, many spin-on oil filters are installed in the normal direction, that is, the oil inlet and outlet of the spin-on filter are facing opposite to the direction of the center of the earth. Therefore, when the engine is stopped, the oil is automatically stored in the spin-on filter tank due to gravity. However, there are still many engines whose oil filters are installed in the reverse direction (the oil inlet and outlet of the spin-on filter are facing the center of the earth). Therefore, when the engine is stopped, the oil will return to the oil pan due to gravity. When the engine is started again, the oil first needs to fill the tank of the spin-on filter, and then the filtered oil is delivered to various lubrication points of the engine. Since there is a delay in the oil being delivered to the lubrication points, the disadvantages are obvious. In order to solve this delay problem, some oil filter manufacturers have added a check valve device on the clean oil side of the spin-on filter, and the process and cost caused by this check valve will also increase accordingly.

[0003] Chinese patent CN203321624U discloses a spin-on oil filter for automobiles, wherein the center tube wall of the spin-on oil filter has more than two through holes, and the distance from any through hole to the bottom end face of the center tube is greater than half of the axial length of the center tube. When the spin-on oil filter is working, the oil passes through the filter element below the through hole, and then climbs along the outer wall of the center tube to the through hole, which generates a lot of flow resistance. At the same time, the pressure difference between the inside and outside of the filter material at the through hole is small, resulting in that the utilization rate of the entire filter element from top to bottom cannot be fully utilized, and the filtering effect is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a central tube, a metal-free environmentally friendly filter element and a spin-on filter in order to overcome the defects of the above-mentioned prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A central tube comprises an inner tube and an outer tube which are coaxially sleeved and connected at the bottom, a gap is provided between the inner tube and the outer tube, a plurality of filter windows are provided on the side wall of the outer tube, the side wall of the inner tube is a continuous structure, and the height of the inner tube is lower than that of the outer tube.

[0007] Preferably, a plurality of filter windows are evenly arranged on the side wall of the outer cylinder, and a part of the filter windows on the side wall of the outer cylinder are located above the inner cylinder.

[0008] Preferably, the area of ​​the filter window located above the inner cylinder accounts for 1 / 5 to 1 / 3 of the total area of ​​the filter window.

[0009] Further preferably, the area of ​​the filter window located above the inner cylinder accounts for 1 / 4 of the total area of ​​the filter window.

[0010] Preferably, the filter window is a rectangular filter window, and the opening rate of the side wall of the outer cylinder is 90-95%.

[0011] Preferably, the inner cylinder is a cylindrical structure with a constant wall thickness, the outer diameter of which gradually decreases from bottom to top, and the gap between the outer cylinder and the inner cylinder gradually increases from bottom to top.

[0012] A metal-free environmentally friendly filter element comprises a filter element body, wherein a coaxial hole is arranged in the center of the filter element body, an upper end cover and a lower end cover are arranged at both ends of the filter element body, a central tube is arranged in the coaxial hole, and the central tube is a non-metallic material central tube.

[0013] A spin-on filter comprises a tank body with an opening at the bottom, a filter element arranged in the tank body and an end cover connected to the bottom of the tank body, wherein the filter element comprises a filter element body, a coaxial hole is arranged in the center of the filter element body, an upper end cover and a lower end cover are arranged at both ends of the filter element body, a center tube is arranged in the coaxial hole, an oil inlet and an oil outlet are arranged on the end cover, and the oil outlet is communicated with the inner cylinder of the center tube.

[0014] Preferably, the spin-on filter further comprises a bypass valve, and the bypass valve is arranged at the upper part of the outer cylinder.

[0015] The working principle of the present invention is:

[0016] The center tube of the present invention is suitable for a reverse-installed spin-on filter (the end covers with the oil inlet and the oil outlet are facing downward during installation). When the engine is stopped, a sealed area is formed between the inner tube of the center tube and the tank body below the top of the inner tube for the spin-on filter using the center tube. The oil can still be stored in the sealed area. When the engine is started again, the oil will fill the tank body in a very short time and will be quickly delivered to the engine lubrication point after filtration, thereby saving space and cost for arranging a check valve on the clean side of the oil.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) Simple structure, safe and reliable: Compared with the need to install a check valve on the clean side, the center pipe has a simple structure, is very convenient to arrange, works reliably, and does not have problems similar to check valve failure.

[0019] (2) High filtration efficiency: The double-layer center tube structure (inner tube and outer tube) not only provides a flow channel gap for the fluid to enter the clean inner tube, but also makes the utilization rate of the filter element more balanced, thereby helping the engine to save energy and reduce emissions. In addition, more oil can be stored in the shutdown state, reducing the time to deliver oil to various lubrication points after the engine is started; the gap between the outer tube and the inner tube gradually increases from bottom to top, further increasing the oil storage capacity in the shutdown state.

[0020] (3) Wide range of applications: The length and diameter of the inner tube of the central tube and the porosity of the filter window of the outer tube can be developed in series according to different filter elements.

[0021] (4) Low production cost: The center tube avoids the installation of a check valve on the clean side, saving production and assembly costs.

[0022] (5) Long service life: The center tube can be made of PA66+GF30 with excellent aging resistance, which effectively guarantees the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the central tube of the present invention;

[0024] Figure 2 is a cross-sectional schematic diagram of the central tube of the present invention;

[0025] Figure 3 It is a cross-sectional schematic diagram of the metal-free environmentally friendly filter element of the present invention;

[0026] Figure 4 It is a cross-sectional schematic diagram of the spin-on filter of the present invention.

[0027] In the figure, 1 is an inner cylinder, 2 is an outer cylinder, 3 is a filter window, 4 is a filter element body, 5 is an upper end cover, 6 is a lower end cover, 7 is a tank body, 8 is an end cover, 9 is an oil outlet, and 10 is a bypass valve. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] A central tube, such as Figures 1-2 As shown, it includes an inner cylinder 1 and an outer cylinder 2 which are coaxially sleeved and connected at the bottom, a gap is provided between the inner cylinder 1 and the outer cylinder 2, a plurality of filter windows 3 are provided on the side wall of the outer cylinder 2, the side wall of the inner cylinder 1 is a continuous structure, and the height of the inner cylinder 1 is lower than that of the outer cylinder 2.

[0031] In this embodiment, the filter window 3 is a rectangular filter window, and multiple filter windows 3 are evenly opened on the side wall of the outer cylinder 2, and the opening rate of the side wall of the outer cylinder 2 is 90-95%. A part of the filter window 3 on the side wall of the outer cylinder 2 is located above the inner cylinder 1, and the length of the inner cylinder can be set as needed, so that the area of ​​the filter window 3 located above the inner cylinder 1 accounts for 1 / 5-1 / 3 of the total area of ​​the filter window 3. In this implementation, the area of ​​the filter window 3 located above the inner cylinder 1 is selected to account for 1 / 4 of the total area of ​​the filter window 3. In addition, the inner cylinder 1 in this embodiment is a cylindrical structure with equal wall thickness, and the outer diameter gradually decreases from bottom to top, and the gap between the outer cylinder 2 and the inner cylinder 1 gradually increases from bottom to top.

[0032] Example 2

[0033] A metal-free environmentally friendly filter element, such as Figure 3 As shown, the metal-free environmentally friendly filter element includes a filter element body 4, a coaxial hole is provided in the center of the filter element body 4, an upper end cover 5 and a lower end cover 6 are provided at both ends of the filter element body 4, and a central tube of Example 1 is provided in the coaxial hole. The central tube is a non-metallic material central tube. The material of the central tube can be selected from PA66+GF30 with excellent aging resistance, and the upper end cover 5 and the lower end cover 6 are also selected from non-metallic materials.

[0034] Example 3

[0035] A spin-on filter, such as Figure 4 As shown, the spin-on filter comprises a tank body 7 with an opening at the bottom, a filter element disposed in the tank body 7, and an end cap 8 connected to the bottom of the tank body 7. The filter element comprises a filter element body 4, a coaxial hole is disposed in the center of the filter element body 4, and an upper end cap 5 and a lower end cap 6 are disposed at both ends of the filter element body 4. Generally, the upper end cap 5 and the lower end cap 6 in this embodiment are made of metal, and a central tube of embodiment 1 is disposed in the coaxial hole. An oil inlet and an oil outlet 9 are disposed on the end cap 8, and the oil outlet 9 is connected to the inner tube 1 of the central tube. The spin-on filter also comprises a bypass valve 10, which is disposed at the upper part of the outer tube 2.

Claims

1. A central tube, characterized in that: It comprises an inner cylinder (1) and an outer cylinder (2) which are coaxially sleeved and connected at the bottom, a gap is provided between the inner cylinder (1) and the outer cylinder (2), a plurality of filter windows (3) are provided on the side wall of the outer cylinder (2), the side wall of the inner cylinder (1) is a continuous structure, and the height of the inner cylinder (1) is lower than the height of the outer cylinder (2); A plurality of filter windows (3) are evenly arranged on the side wall of the outer cylinder (2); a portion of the filter windows (3) on the side wall of the outer cylinder (2) are located above the inner cylinder (1); the area of ​​the filter windows (3) located above the inner cylinder (1) accounts for 1 / 5 to 1 / 3 of the total area of ​​the filter windows (3); The filter window (3) is a rectangular filter window, and the opening rate of the side wall of the outer cylinder (2) is 90-95%; The area of ​​the filter window (3) located above the inner cylinder (1) accounts for 1 / 4 of the total area of ​​the filter window (3); The inner cylinder (1) is a cylindrical structure with a constant wall thickness, the outer diameter of which gradually decreases from bottom to top, and the gap between the outer cylinder (2) and the inner cylinder (1) gradually increases from bottom to top.

2. A metal-free environmentally friendly filter element, characterized in that: It comprises a filter element body (4), wherein a coaxial hole is provided in the center of the filter element body (4), an upper end cover (5) and a lower end cover (6) are provided at both ends of the filter element body (4), and a central tube as claimed in claim 1 is provided in the coaxial hole, and the central tube is a non-metallic central tube.

3. A spin-on filter, characterized in that: The invention comprises a tank body (7) with an opening at the bottom, a filter element arranged in the tank body (7), and an end cover (8) connected to the bottom end of the tank body (7), wherein the filter element comprises a filter element body (4), a coaxial hole is arranged in the center of the filter element body (4), an upper end cover (5) and a lower end cover (6) are arranged at both ends of the filter element body (4), a center tube according to claim 1 is arranged in the coaxial hole, an oil inlet and an oil outlet (9) are arranged on the end cover (8), and the oil outlet (9) is connected to the inner cylinder (1) of the center tube; The spin-on filter also includes a bypass valve (10), which is arranged at the upper part of the outer cylinder (2).

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