Oil filter with outlet check valve

Abstract

The utility model discloses an oil filter with an outlet check valve, which comprises a cylindrical shell, a central framework is arranged in the shell, a cylindrical filter layer is arranged outside the central framework, and an annular gap is arranged between the filter layer and the inner surface of the shell; an annular oil inlet is formed in the lower surface of the shell; an oil outlet used for being inserted into an oil outlet connecting pipe is formed in the oil inlet. A lower end cover is arranged at the lower end of the filtering layer; the lower end cover is fixedly connected with a support in an upward mode, the support extends into the center framework in an upward mode, an outlet check valve is installed on the support, the opening direction of the outlet check valve is from top to bottom, and the outlet check valve is connected with an inner cavity of the center framework and the oil outlet. Through the outlet check valve, conduction is naturally stopped when positive pressure disappears, so that oil of the vertically arranged oil filter is prevented from flowing out downwards when an engine stops working, and the phenomenon of instant dry grinding caused by lack of oil in the oil filter when the engine is restarted is avoided.

Description

Technical Field

[0001] The utility model relates to the field of machinery, in particular to an oil filter. Background Art

[0002] As a vital component of the engine's lubrication system, the oil filter's performance plays a crucial role in engine performance. Due to limitations in mounting structures and other factors, some oil filters must be installed horizontally or with the filter opening facing downward. With these filters, gravity forces oil to flow downward from the filter after the engine stops. If the engine is restarted after an extended period of inactivity, the lack of oil in the oil filter can cause transient dry wear (this occurs when oil recirculates through the filter after the engine starts, leading to transient dry wear).

[0003] The check valve, also called a one-way valve, is one of the most important components to ensure the correct operation of the engine and control the oil flow, and plays an important role during use.

[0004] Existing technologies have not paid enough attention to the transient dry grinding phenomenon. Check valves are often installed only at the oil filter inlet to prevent oil backflow, but they cannot prevent transient dry grinding. Repeated engine stops and starts can cause multiple transient dry grinding events, which can negatively impact the engine over time. Therefore, it is necessary to add a check valve at the filter outlet to provide enhanced engine protection. Utility Model Content

[0005] The purpose of the utility model is to provide an oil filter with an outlet check valve to prevent the oil in the oil filter from flowing downward when the engine is stopped, thereby avoiding the instantaneous dry grinding phenomenon when the engine is restarted.

[0006] To achieve the above-mentioned object, the oil filter with an outlet check valve of the present invention comprises a cylindrical housing, a central frame is provided in the housing, a cylindrical filter layer is provided outside the central frame, and an annular gap is formed between the filter layer and the inner surface of the housing; an annular oil inlet is provided on the lower surface of the housing; an oil outlet for inserting an oil outlet pipe is provided in the oil inlet; an upper end cap is provided at the upper end of the filter layer and a lower end cap is provided at the lower end; the oil inlet communicates with the annular gap;

[0007] The lower end cover is fixedly connected to a bracket, which extends upward into the central frame. An outlet check valve is installed on the bracket. The outlet check valve is directed from top to bottom and connects the inner cavity of the central frame with the oil outlet.

[0008] The outlet check valve includes a valve cylinder, which is open at both ends; a horizontal connecting ring is provided at the top of the valve cylinder, which is fixedly connected to the bracket upward, and a sealing gasket is provided in the valve cylinder below the horizontal connecting ring, which is connected to a steel gasket downward, and the steel gasket is pressed downward by a spring, and the bottom end of the spring is pressed on the lower claw, and the lower claw is fixedly connected to the valve cylinder, and the spring is used to press the sealing gasket upward against the horizontal connecting ring under normal pressure; there is an oil-passing gap between the sealing gasket and the valve cylinder.

[0009] The steel pad is provided with a clamping hole, and the sealing pad is integrally provided with a clamping block downwardly, and the clamping block is clamped into the clamping hole to tightly connect the steel pad and the sealing pad together.

[0010] A horizontal connecting portion is radially extended from the bottom end of the bracket, and a connecting groove is recessed downward at the junction of the lower end cover of the filter layer and the horizontal connecting portion. The horizontal connecting portion is welded to the bottom of the connecting groove, and the top surface of the horizontal connecting portion is flush with the upper surface of the lower end cover of the filter layer. The bottom end of the filter layer is bonded to the upper surface of the lower end cover of the filter layer and the top surface of the horizontal connecting portion through an adhesive layer.

[0011] The utility model has the following advantages:

[0012] When the engine stops, the oil pump also stops working, and the positive pressure at the oil filter disappears. The utility model uses the outlet check valve to naturally stop conducting when the positive pressure disappears, thereby preventing oil from flowing downward from the vertically arranged oil filter when the engine stops. This ensures that the oil filter is always filled with lubricating oil, avoiding the phenomenon of instantaneous dry grinding due to lack of oil in the oil filter when the engine is restarted.

[0013] The outlet check valve of the utility model has a simple structure, is easy to assemble, has a low cost, and can reliably realize the functions of positive pressure conduction and normal pressure closing, thereby preventing the instantaneous dry grinding phenomenon caused by lack of engine oil when the engine is started.

[0014] The sealing gasket and the clamping block are elastic, and the connection structure of the steel gasket makes it easy for the sealing gasket and the steel gasket to be firmly assembled together after they are manufactured separately. During assembly, it is only necessary to squeeze the clamping block from top to bottom through the clamping hole (at this time the sealing gasket and the steel gasket are tightly pressed together).

[0015] The connection groove is provided to ensure that the top surface of the horizontal connection part is flush with the upper surface of the lower end cover of the filter layer, so as to prevent the horizontal connection part from protruding upward from the lower end cover of the filter layer, and to avoid the phenomenon of loose bonding caused by the unevenness of the lower end cover of the filter layer and the horizontal connection part (forming a step structure) when the filter layer is bonded downward to the lower end cover of the filter layer and the horizontal connection part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the present utility model. Figure 1The direction indicated by the arrow is the flow direction of the engine oil during normal filtration.

[0017] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 yes Figure 1 Enlarged view of point B in the middle. DETAILED DESCRIPTION

[0019] like Figures 1 to 3 As shown, the oil filter with an outlet check valve of the utility model includes a cylindrical shell 1, a central skeleton 2 is provided in the shell 1, a cylindrical filter layer 3 is provided outside the central skeleton 2, and an annular gap 4 is provided between the filter layer 3 and the inner surface of the shell 1; an annular oil inlet 5 is provided on the lower surface of the shell 1; an oil outlet 6 for inserting an oil outlet pipe is provided in the oil inlet 5; the upper end of the filter layer 3 has an upper end cover 7 and the lower end has a lower end cover 8; the oil inlet 5 is connected to the annular gap 4,

[0020] The lower end cover 8 is fixedly connected to a bracket 9, which extends upward into the central frame 2. An outlet check valve is installed on the bracket 9. The outlet check valve is directed from top to bottom and connects the inner cavity of the central frame 2 with the oil outlet 6.

[0021] When the engine stops, the oil pump also stops working, and the positive pressure at the oil filter disappears. The utility model uses the outlet check valve to naturally stop conducting when the positive pressure disappears, thereby preventing oil from flowing downward from the vertically arranged oil filter when the engine stops. This ensures that the oil filter is always filled with lubricating oil, avoiding the phenomenon of instantaneous dry grinding due to lack of oil in the oil filter when the engine is restarted.

[0022] The outlet check valve includes a valve cylinder 10, which is open at both the top and bottom ends. A horizontal connecting ring 11 is provided at the top of the valve cylinder 10, which is fixedly connected to the bracket 9 (clipped in the figure). A sealing gasket 12 is provided in the valve cylinder 10 below the horizontal connecting ring 11. The sealing gasket 12 is connected downwardly to a steel washer 13, which is pressed downwardly by a spring 14. The bottom end of the spring 14 is pressed onto a lower clamping claw 15, which is fixedly connected to the valve cylinder 10. The spring 14 is used to press the sealing gasket 12 upward against the horizontal connecting ring 11 under normal pressure. An oil-passing gap is provided between the sealing gasket 12 and the valve cylinder 10. When the sealing gasket 12 moves downward under positive pressure, the top inlet of the valve cylinder 10 connects to the cavity between the valve cylinder 10 and the bracket 9.

[0023] The outlet check valve of the utility model has a simple structure, is easy to assemble, has a low cost, and can reliably realize the functions of positive pressure conduction and normal pressure closing, thereby preventing the instantaneous dry grinding phenomenon caused by lack of engine oil when the engine is started.

[0024] The steel pad 13 is provided with a snap-fitting hole, and the sealing pad 12 is integrally provided with a snap-fitting block 16 downward. The snap-fitting block 16 is snapped into the snap-fitting hole to tightly connect the steel pad 13 and the sealing pad 12 together.

[0025] The sealing gasket 12 and its clamping block 16 are elastic, and the connection structure of the steel gasket 13 facilitates the sealing gasket 12 and the steel gasket 13 to be firmly assembled together after they are manufactured separately. During assembly, it is only necessary to squeeze the clamping block 16 from top to bottom through the clamping hole (at this time, the sealing gasket 12 and the steel gasket 13 are tightly pressed together).

[0026] A horizontal connecting portion 17 is radially extended from the bottom end of the bracket 9, and a connecting groove 18 is recessed downward at the junction of the lower end cover 8 of the filter layer and the horizontal connecting portion 17. The horizontal connecting portion 17 is welded to the bottom of the connecting groove 18, and the top surface of the horizontal connecting portion 17 is flush with the upper surface of the lower end cover 8 of the filter layer. The bottom end of the filter layer 3 is bonded to the upper surface of the lower end cover 8 of the filter layer and the top surface of the horizontal connecting portion 17 by an adhesive layer 19.

[0027] The connection groove 18 is provided to ensure that the top surface of the horizontal connection portion 17 is flush with the upper surface of the lower end cover 8 of the filter layer, so as to prevent the horizontal connection portion 17 from protruding upward from the lower end cover 8 of the filter layer, and to avoid the phenomenon of weak bonding caused by the unevenness of the lower end cover 8 and the horizontal connection portion 17 of the filter layer when the filter layer 3 is bonded downwardly to the lower end cover 8 and the horizontal connection portion 17 of the filter layer.

[0028] When the engine is running, the oil pump also operates. In the oil path, the motor vehicle's oil pump is located upstream of the oil filter. This creates positive pressure at the oil filter, forcing gasket 12 downward and away from horizontal connecting ring 11. The oil then flows through the oil filter as follows: It enters the annular gap 4 through an annular oil inlet 5, then radially passes through filter layer 3. Impurities in the oil are filtered by filter layer 3, and the filtered, clean oil enters central frame 2. It then flows downward into valve cylinder 10, then flows downward through the oil clearance between gasket 12 and valve cylinder 10, ultimately entering the oil outlet connection pipe through oil outlet 6, and then flows toward the oil pump and engine. When the engine stops working, the oil pump also stops, and the positive pressure at the oil filter disappears. Under the elastic force of the spring 14, the sealing gasket 12 resets upward and presses the horizontal connecting ring 11, thereby closing the top inlet of the valve cylinder 10, preventing the oil in the center skeleton 2 from continuing to flow downward under the action of gravity, keeping the center skeleton 2 always full of oil, and thus avoiding instantaneous dry grinding caused by lack of oil in the oil filter when the engine is started again, which protects the engine more effectively than before.

[0029] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. An oil filter with an outlet check valve comprises a cylindrical housing, a central frame is arranged inside the housing, a cylindrical filter layer is arranged outside the central frame, and an annular gap is provided between the filter layer and the inner surface of the housing; an annular oil inlet is arranged on the lower surface of the housing; an oil outlet for inserting an oil outlet pipe is arranged inside the oil inlet; an upper end cover is arranged at the upper end of the filter layer and a lower end cover is arranged at the lower end; the oil inlet communicates with the annular gap, Features: The lower end cover is fixedly connected with a bracket upward, the bracket extends upward into the central frame, an outlet check valve is installed on the bracket, the outlet check valve is conducted from top to bottom, and the outlet check valve connects the inner cavity of the central frame and the oil outlet.

2. The oil filter with an outlet check valve according to claim 1, characterized in that: The outlet check valve includes a valve cylinder, which is open at both ends; a horizontal connecting ring is provided at the top of the valve cylinder, which is fixedly connected to the bracket upward, a sealing gasket is provided in the valve cylinder below the horizontal connecting ring, the sealing gasket is connected to a steel gasket downward, the steel gasket is pressed downward with a spring, the bottom end of the spring is pressed on the lower claw, the lower claw is fixedly connected to the valve cylinder, and the spring is used to press the sealing gasket upward against the horizontal connecting ring under normal pressure; there is an oil passing gap between the sealing gasket and the valve cylinder.

3. The oil filter with an outlet check valve according to claim 2, characterized in that: The steel pad is provided with a clamping hole, and the sealing pad is integrally provided with a clamping block downwardly, and the clamping block is clamped into the clamping hole to tightly connect the steel pad and the sealing pad together.

4. The oil filter with an outlet check valve according to any one of claims 1 to 3, characterized in that: A horizontal connecting portion is radially extended at the bottom end of the bracket, and a connecting groove is recessed downward at the junction of the lower end cover of the filter layer and the horizontal connecting portion. The horizontal connecting portion is welded to the bottom of the connecting groove, and the top surface of the horizontal connecting portion is flush with the upper surface of the lower end cover of the filter layer. The bottom end of the filter layer is bonded together with the upper surface of the lower end cover of the filter layer and the top surface of the horizontal connecting portion by an adhesive layer.

Images