A filter element with exhaust function

Abstract

The present invention discloses a filter element with exhaust function, comprising a central column, a filter medium sleeved outside the central column, and an upper end cover and a lower end cover located at the upper and lower ends of the central column; characterized in that a connector extending along the axial direction of the filter element, having a hollow structure and openings at both ends is provided between the central column and the lower end cover, the top end of the connector is plugged into the central column, and the bottom end is connected to a through hole opened in the center of the lower end cover; an exhaust passage is provided in the filter element, and its two ends form an inlet and an outlet on the inner wall of the connector and the top surface of the upper end cover, respectively. The beneficial effect of the present invention is that the exhaust effect is improved and has a higher fuel filtration efficiency.

Description

Technical Field

[0001] The invention relates to a filter element, in particular to a filter element with an exhaust function. Background Art

[0002] In the fuel supply system of a fuel engine, the presence of gas during installation or the influence of negative pressure during operation causes the solubility of gas in the fuel to decrease, resulting in gas overflow, or the influence of high temperature produces fuel vapor. The accumulation of gas will lead to unstable fuel supply, insufficient power output or fuel engine shutdown. Therefore, the filter element in the system filter needs to have an exhaust function.

[0003] A filter element with this function, for example, patent publication number CN211448861U discloses a filter element with an exhaust structure for a diesel filter. Referring to FIG5 of the patent and in conjunction with the specification

[0025] , "the filter element upper cover is provided with an exhaust structure connected to the oil passage at a position corresponding to the oil passage, the exhaust structure is provided with two exhaust holes opposite to each other at one end away from the filter element upper cover, the exhaust holes are connected to the oil passage, the exhaust assembly includes an exhaust member body, an exhaust passage with an opening at one end is provided in the middle of the exhaust member body, the opening is connected to the oil passage, and the exhaust hole is provided at the opposite end of the exhaust passage. At the other end, the exhaust hole is arranged perpendicular to the exhaust channel, the outer wall of the exhaust body close to the opening end is provided with an external thread, the filter cover is provided with an internal thread matching the external thread, the exhaust body is threadedly connected to the filter cover, and the exhaust body is made of a transparent material. "In this patent, the central tube of the filter is directly connected to the exhaust channel, so the air pressure state inside the filter is unstable and is easily affected by the oil intake of the filter, and the unstable air pressure state affects the separation of gas in the fuel, which is easy to cause insufficient exhaust and insufficient fuel pressure.

[0004] To solve this problem, the patent with publication number CN212202312U discloses a fuel filter with automatic exhaust function. Figure 1 , 2Combined with the specification [0022-0023] "An oil outlet channel and two exhaust channels are respectively opened on the central tube, the oil outlet channel and the oil inlet channel are connected through the filter medium, the oil inlet channel and the exhaust channel are connected through the exhaust opening on the end cover of the central tube, and the oil outlet channel and the two exhaust channels are independent of each other and do not affect each other. The lower end of the oil outlet channel passes through the filter housing and is connected to the outside world, the upper end of the exhaust channel is connected to the exhaust opening, and the lower end of the exhaust channel passes through the filter housing and is connected to the outside world. After the engine fuel pump is turned on, the unfiltered fuel is gradually transported to the empty filter through the oil inlet channel. At this time, the air in the filter will be compressed to the filter The fuel passes through the exhaust opening on the end cover of the center tube, enters the exhaust channel in the center tube, and is finally discharged from the filter. The unfiltered fuel is first filtered through the filter medium to form clean fuel, then enters the center tube, and is discharged from the filter through the oil outlet channel on the center tube to the engine. "In this patent, the oil outlet channel and the exhaust channel are independent of each other, which can solve the problem of unstable air pressure in the filter element. However, the fuel first exhausts the air through the exhaust channel, and then filters the impurities in the fuel through the filter medium. The moving path of the fuel in the filter element is too long, which makes the working efficiency of the filter element relatively low. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a filter element with an exhaust function, which improves the exhaust effect, the reliability of fuel pressure stability and has a higher fuel filtering efficiency.

[0006] The present invention is achieved through the following technical solutions.

[0007] A filter element with an exhaust function comprises a central column, a filter medium sleeved outside the central column, and an upper end cover and a lower end cover located at the upper and lower ends of the central column; a connector extending along the axial direction of the filter element, having a hollow structure and openings at both ends is provided between the central column and the lower end cover, the top end of the connector is inserted into the central column, and the bottom end is connected to a through hole opened in the center of the lower end cover; an exhaust passage is provided in the filter element, and an exhaust port and an inlet are formed at the inner wall of the connector and the top surface of the upper end cover at its two ends, respectively.

[0008] As a further improvement of the present invention, the exhaust passage includes an exhaust column which is connected to the upper end cover and the connecting head and has a hollow structure, a first air path arranged in the connecting head, and a second air path arranged in the upper end cover; one end of the first air path forms an exhaust port on the inner wall of the connecting head, and the other end is connected to the bottom end of the exhaust column; one end of the second air path forms an inlet port on the top of the upper end cover, and the other end is connected to the top end of the exhaust column.

[0009] As a further improvement of the present invention, the bottom end of the connecting head is integrally connected with a boss seat body extending radially thereof and supported on the top surface of the lower end cover; the bottom end of the exhaust column is connected to the boss seat body; a part of the first gas path is located in the connecting head, and the other part is located in the boss seat body.

[0010] As a further improvement of the present invention, a linear groove is formed extending from the inner wall of the connector to the bottom surface of the boss seat body; a first annular sealing ring is embedded in the bottom end of the connector, and a portion of the linear groove between one end of the inner wall of the connector and the sealing ring forms the exhaust port; the first sealing ring and the lower end cover seal the remaining portion of the linear groove to form the first gas path; the other end of the linear groove located on the bottom surface of the boss seat body is connected to the bottom end of the exhaust column.

[0011] As a further improvement of the present invention, the top surface of the lower end cover has a concave seat which is concave downward and has a contour matching the shape of the boss seat body, and the boss seat body is embedded in the concave seat.

[0012] As a further improvement of the present invention, the bottom surface of the boss seat body has at least one sealing groove surrounding the linear groove, and the surface of the concave socket has a sealing convex strip that is snap-fitted with the sealing groove.

[0013] As a further improvement of the present invention, the top surface of the lower end cover has a circle of annular groove along the edge of the through hole; the bottom end of the connector has a circle of annular flange, and the annular flange is embedded in the annular groove.

[0014] As a further improvement of the present invention, the boss seat body and the upper cover body have plug connectors that are connected to the first gas path and the second gas path and are respectively inserted into the top end and the bottom end of the exhaust column.

[0015] As a further improvement of the present invention, the top end and the bottom end of the exhaust column both have a closing structure with a reduced inner diameter, and the plug connector and the closing structure are interference fit.

[0016] As a further improvement of the present invention, a second annular sealing ring is embedded in the top end of the connector.

[0017] Beneficial effects of the present invention:

[0018] The filter element is provided with an exhaust channel for discharging gas in the fuel. The exhaust channel and the space inside the filter element are separated from each other through the first gas path, the second gas path and the exhaust column, so as to avoid an unstable exhaust effect caused by changing the air pressure state in the filter element. While discharging the gas, it is necessary to maintain sufficient fuel pressure or vacuum in the system. In addition, sealing measures such as sealing grooves and sealing convex strips provided on the boss seat body can achieve a better sealing effect, maintain sufficient fuel supply pressure, and avoid fuel pressure loss during the exhaust process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to help understand the purpose and advantages of the present invention, wherein:

[0020] Figure 1 It is a cross-sectional schematic diagram of a filter element with exhaust function;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram of

[0022] Figure 3 It is a schematic diagram of the structure of the connector and the boss seat;

[0023] Figure 4 It is a schematic diagram of the structure of the lower end cover. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below based on the accompanying drawings and implementation examples.

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. The words "inside" and "outside" refer to the direction toward or away from the geometric center of a specific component, respectively. They are relative concepts, and therefore may change accordingly according to different locations and different usage conditions. Therefore, these or other directional terms should not be interpreted as restrictive terms.

[0026] Reference Figure 1-Figure 4, a filter element with exhaust function, installed in a fuel filter, includes a central column 1, a filter medium 2 sleeved outside the central column 1, an upper end cover 3 and a lower end cover 4 located at the upper and lower ends of the central column 1, and these components constitute the main functional structure for filtering and separating solid impurities in the fuel. A connector 5 is also provided between the bottom end of the central column 1 and the lower end cover 4. The connector 5 extends up and down along the axial direction of the filter element and is a hollow structure with openings at both ends. The top end of the connector 5 is inserted into the central column 1, and the bottom end is connected to the through hole 4-1 opened in the center of the lower end cover 4. The aperture of the through hole 4-1 opened in the center of the lower end cover 4 is larger than the inner diameter of the central column 1, that is, the aperture of the top opening of the connector 5 is smaller than the bottom end. The diameter of the connector 5 gradually increases from the top to the bottom, and the cross section presents a diameter gradient change formed by multiple step-like structures.

[0027] The connector 5 connects the inside of the filter element with the filter to form an oil passage, and outputs the clean fuel from which solid impurities are filtered out by the filter medium 2 to the outside and enters the pipeline that flows to the vehicle engine.

[0028] An exhaust passage is provided in the filter element, and a discharge port 6-1 is formed on the inner wall of the connector 5, and an inlet port 6-2 is formed on the top surface of the upper end cover 3. The exhaust passage is independent of the space in the center column 1 in the filter element. Since the exhaust passage is connected to the outside of the filter element, a negative pressure environment is formed. The gas gathered at the upper end of the filter element enters the exhaust channel through the inlet port 6-2, and is then discharged from the outlet port 6-1 to the pipeline connected to the fuel tank. In addition, the fuel entering the filter element is filtered out of solid impurities by the filter medium 2, enters the center column 1, and is then output to the fuel supply system through the connector 5. During the exhaust process, part of the fuel will flow back into the exhaust passage through the inlet port 6-2, and be discharged to the fuel tank through the outlet port 6-1. Usually, the diameter of the inlet port 6-2 and / or the diameter of the outlet port 6-1 are small holes, and the fuel flow rate is very small, which can maintain the normal fuel supply pressure of the system while realizing the exhaust function.

[0029] The exhaust passage includes an exhaust column 63 which is a hollow structure connecting the upper end cover 3 and the connector 5, a first gas path 61 provided in the connector 5, and a second gas path 62 provided in the upper end cover 3, wherein one end of the first gas path 61 forms an exhaust port 6-1 on the inner wall of the connector 5, and the other end is connected to the bottom end of the exhaust column 63, and one end of the second gas path 62 forms an inlet port 6-2 on the top of the upper end cover 3, and the other end is connected to the top end of the exhaust column 63. By providing the exhaust column 63 to connect the upper end cover 3 and the connector 5, the exhaust passage and the space inside the center column 1 can be isolated and independent.

[0030] The diameter of the center column 1 and the diameter of the bottom end of the connector 5 are roughly the same, and are slightly larger than the through hole 4-1 at the center of the lower end cover 4. It is difficult to arrange the exhaust column 63 directly connected to the connector 5 in space, and there will be a large restriction on the caliber of the exhaust column 63. In this embodiment, the bottom end of the connector 5 is integrally connected with a lug seat body 51 extending along its radial direction and supported on the top surface of the lower end cover 4. The lug seat body 51 is a flat structure, and the end away from the connector 5 is semicircular in outline. The filter medium 2 is made of filter paper, which is folded into a cylindrical sleeve outside the center column 1. The exhaust column 63 is located between the two folded surfaces of the filter paper, the top end is connected to the upper cover body, and the bottom end is connected to the lug seat body 51. A part of the first air path 61 is located inside the connector 5, and the other part is located inside the lug seat body 51. The boss seat 51 is structurally equivalent to an extension of the connector 5, so that the location of the exhaust column 63 in the filter element is more flexible, and the diameter of the exhaust column 63 is not restricted and can be reasonably set according to actual application requirements.

[0031] Furthermore, a linear groove 5-A is formed extending from the inner wall of the connector 5 to the bottom surface of the boss seat body 51, with one end of the linear groove 5-A located in the middle of the inner wall of the connector 5, and the other end located below the connection position between the boss seat body 51 and the bottom end of the exhaust column 63. The connector 5 presents a diameter gradient change formed by multiple step structures in cross section, and the linear groove 5-A also changes accordingly in structure so that the depth of the linear groove 5-A remains basically the same along its extension direction. An annular first sealing ring 71 is embedded in the bottom end of the connector 5. The first sealing ring 71 has a certain thickness, and its bottom surface is roughly flush with the bottom surface of the lower end cover 4. The height of its top surface is slightly lower than the end of the linear groove 5-A located on the inner wall of the connector 5, so that a part of the notch of the linear groove 5-A is exposed to the outside, and the part of the notch of the linear groove 5-A located between one end of the inner wall of the connector 5 and the sealing ring forms the exhaust port 6-1 of the first gas path 61. The first sealing ring 71 and the lower end cover 4 seal the rest of the notch of the linear groove 5-A to form the first gas path 61. The other end of the linear groove 5-A located on the bottom surface of the boss seat 51 is connected to the bottom end of the exhaust column 63. Compared with using drilling equipment to process the first air path 61 on the connector 5 and the boss seat body 51, the first air path 61 is formed by cutting a linear groove 5-A on the inner wall of the connector 5 and the bottom surface of the boss seat body 51, and using a sealing ring and a first cover body to partially cover and seal. This can reduce the difficulty of processing the connector 5 and the boss seat body 51; the first sealing ring 71 can also play a better sealing role on the oil channel to prevent fuel from leaking from the bottom of the filter element.

[0032] In addition, a second annular sealing ring 72 is embedded in the top end of the connector 5, thereby forming a sealing structure at the upper end of the oil discharge passage to prevent leakage of the fuel during output.

[0033] The top surface of the lower end cover 4 has an inner recessed seat 41 which is recessed downward and has a contour matching the shape of the boss seat 51. The boss seat 51 is embedded in the inner recessed seat 41, and a sealing barrier layer can be applied along the edge of the inner recessed seat 41 to seal the periphery of the boss seat 51, thereby preventing leakage of fuel flowing through the first gas path 61 and causing fuel pressure loss.

[0034] The bottom surface of the boss seat body 51 has at least one sealing groove 5-B surrounding the linear groove 5-A, and the surface of the concave socket 41 has a sealing convex strip 4-B that engages with the sealing groove 5-B, which can further improve the sealing effect, thereby preventing excessive fuel from flowing back to the fuel tank through the exhaust channel and causing a loss of fuel supply pressure.

[0035] The top surface of the lower end cover 4 has a circle of annular groove 4-A along the edge of the through hole 4-1, and the bottom end of the connecting head 5 has a circle of annular flange 5-C, which is embedded in the annular groove 4-A. The arrangement of the annular groove 4-A and the annular flange 5-C makes the connection between the connecting head 5 and the lower end cover 4 more convenient, and can also form a sealing structure along the through hole position of the lower end cover 4 to prevent fuel from leaking between the through hole 4-1 of the lower end cover 4 and the oil discharge passage to cause fuel pressure loss.

[0036] The lug seat body 51 and the upper cover body have plug connectors 6-A that are connected to the first gas path 61 and the second gas path 62 and are respectively inserted at the top and bottom ends of the exhaust column 63. The top and bottom ends of the exhaust column 63 both have a closing structure 6-B with a reduced inner diameter. The central tube and the upper and lower covers 6-A and 6-B, the filter medium and the upper end cover, the lower end cover, the lug seat body 51 and the connector 5 are all bonded by colloid. The plug connector 6-A can make the medium flow between the first gas path 61, the second gas path 62 and the exhaust column 63 more stable, improve the stability of exhaust, and the closing structure 6-B improves the sealing performance of the two ends of the exhaust column 63 to prevent fuel and air from leaking into the filter element.

[0037] Finally, it should be noted that the above implementation cases are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned implementation cases, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned implementation cases, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation cases of the present invention.

Claims

1. A filter element with exhaust function, comprising a central column, a filter medium sleeved outside the central column, and an upper end cover and a lower end cover located at the upper and lower ends of the central column; characterized in that: A connector extending along the axial direction of the filter element, having a hollow structure and openings at both ends is provided between the center column and the lower end cover, the top end of the connector being inserted into the center column, and the bottom end being connected to a through hole opened in the center of the lower end cover; an exhaust passage is provided in the filter element, and an inlet and an outlet are formed at the inner wall of the connector and the top surface of the upper end cover at its two ends, respectively; the exhaust passage comprises an exhaust column which is a hollow structure connecting the upper end cover and the connector, a first air path provided in the connector, and a second air path provided in the upper end cover; one end of the first air path forms an inlet on the inner wall of the connector, and the other end is connected to the bottom end of the exhaust column; one end of the second air path forms an outlet at the top of the upper end cover, and the other end is connected to the top end of the exhaust column, and the bottom end of the connector is integrally connected to A boss seat body is connected to it which extends radially and is supported on the top surface of the lower end cover; the bottom end of the exhaust column is connected to the boss seat body; a part of the first gas path is located in the connector, and the other part is located in the boss seat body, and a linear groove is formed by extending from the inner wall of the connector to the bottom surface of the boss seat body; an annular first sealing ring is embedded in the bottom end of the connector, and the linear groove is located at a part of the groove between one end of the inner wall of the connector and the sealing ring to form the inlet; the first sealing ring and the lower end cover seal the rest of the groove of the linear groove to form the first gas path; the other end of the linear groove located at the bottom surface of the boss seat body is connected to the bottom end of the exhaust column, and an annular second sealing ring is embedded in the top end of the connector.

2. The filter element with exhaust function according to claim 1, characterized in that: The top surface of the lower end cover is provided with a concave card seat which is concave downwards and has a contour matching the shape of the boss seat body, and the boss seat body is embedded in the concave card seat.

3. The filter element with exhaust function according to claim 2, characterized in that: The bottom surface of the convex handle seat body has at least one sealing groove surrounding the linear groove, and the surface of the concave clamping seat has a sealing convex strip that is engaged with the sealing groove.

4. The filter element with exhaust function according to claim 3, characterized in that: The top surface of the lower end cover is provided with a circle of annular groove along the edge of the through hole; the bottom end of the connector is provided with a circle of annular flange, and the annular flange is embedded in the annular groove.

5. The filter element with exhaust function according to claim 1, characterized in that: The boss seat body and the upper cover body are provided with plug connectors which are connected with the first gas path and the second gas path and are respectively inserted into the top end and the bottom end of the exhaust column.

6. The filter element with exhaust function according to claim 5, characterized in that: The top end and the bottom end of the exhaust column both have a closing structure with a reduced inner diameter.

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