CN210033683U - Fuel filter element with safety valve - Google Patents

Abstract

The utility model discloses a fuel filter element with a safety valve. A safety valve is arranged on the end cover surface of the filter element. Under normal conditions, a sealing member of the safety valve separates a hydrophobic cavity from the outside. A filter screen is arranged between the hydrophobic cavity and the flow channel to filter the fuel. In the utility model, after the filter layer is blocked, the inside of the drain pipe assembly overcomes the spring pressure of the safety valve due to the internal and external pressure difference, so that the safety valve is opened downward, and the diesel oil enters the inside of the filter element through the safety valve, and runs along the top of the drain pipe assembly. The arc-shaped spherical surface flows into the hydrophobic cavity, and the impurities and water are filtered from the hydrophobic cavity through the filter screen on the hydrophobic pipe assembly. to keep the vehicle running normally. Diesel is filtered by the hydrophobic net and then delivered to the engine, preventing impurities from entering the engine and causing damage to precision components such as fuel pumps and injectors.

Description

Fuel filter element with safety valve

technical field

The utility model relates to the technical field of diesel oil filtering, in particular to a fuel filter element with a safety valve.

Background technique

The quality and cleanliness of diesel fuel is a key factor to ensure the performance and service life of the engine. Clean fuel can be burned more fully, and the exhaust gas after combustion contains less harmful gas, which meets the requirements of environmental protection. After the engine uses clean diesel, the failure rate is significantly reduced, the efficiency is improved, the maintenance cost is reduced, the fuel consumption is reduced, the fuel saving effect is obvious, and the service life is prolonged. The diesel filter element is one of the important components to ensure the fuel quality of the diesel engine. The function of the diesel filter element is to filter out impurities, water and other pollutants in the diesel oil before the diesel oil enters the fuel transfer pump and injector, so as to avoid the fuel transfer pump and fuel injection. Excessive wear or blockage of important components such as the engine ensures the normal operation of the engine.

The diesel filter element commonly used at present is shown in Figure 1. The diesel oil enters the hydrophobic cavity 7 after being filtered by the filter layer 2, and then the water is filtered through the filter screen 8 of the hydrophobic pipe assembly 3, and the filtered water flows from the hydrophobic cavity 7 into the water collecting cavity. After being discharged, the filtered diesel oil enters the internal flow channel 9 of the drain pipe assembly 3, and is transported to the engine from the internal flow channel 9. The longer the existing diesel filter element is used, the more impurities are filtered in the filter element, and the accumulated impurities will block the filter layer. After the diesel filter element fails, the diesel oil cannot be delivered to the fuel pump and the fuel injector through the filter element, which affects the normal operation of the engine and makes the vehicle unable to operate normally. For example, the patent 201811324346.1 applied by the applicant discloses a fuel pre-filter filter element assembly. The drain pipe assembly is provided with a skeleton inside the filter element, and a check valve is arranged in the valve seat on the upper part of the skeleton. When the filter layer is blocked, the After the negative pressure inside the filter element overcomes the spring force of the one-way valve, the one-way valve opens, and part of the unfiltered fuel enters the drain pipe from the outside through the through hole at the bottom of the one-way valve to compensate for the fuel inside the filter element and avoid fuel Insufficient, causing the vehicle to have insufficient fuel supply or even unable to start. However, the fuel directly enters the hydrophobic layer without being filtered and is delivered to the engine. The impurities and moisture in the fuel will enter the engine and cause damage to precision components such as the fuel pump and injector.

As shown in FIG. 1 , the air holes 5 of the existing fuel filter element are generally arranged on the flat upper end cover. When the floating impurities in the filter element reach the top of the upper end cover, the air holes 5 are easily blocked.

Utility model content

In view of the shortcomings of the above-mentioned existing diesel filter element that when the filter layer is blocked, the unfiltered fuel directly enters the drain pipe and is transported to the engine, causing damage to the precision components of the engine, and provides a safety valve with a reasonable structure. After the filter layer is blocked, the diesel oil flows in through the safety valve, and is filtered by the filter screen of the drain pipe assembly before being sent to the engine, so as to avoid damage to the precision parts of the engine caused by impurities and moisture.

The technical scheme adopted by the utility model is as follows:

A fuel filter element with a safety valve is provided with a safety valve on the end cover of the filter element. Under normal circumstances, the seal of the safety valve separates the hydrophobic cavity from the outside. In an emergency state, the seal moves under pressure, and the inside and outside are connected; A filter screen is arranged between the runner and the flow channel to filter the fuel.

The utility model is provided with a filter screen between the hydrophobic cavity and the flow channel. When the safety valve is opened in an emergency state, the fuel flowing through the safety valve is filtered by the filter screen, and then enters the internal flow channel and is transported to the engine to ensure the normal operation of the engine. It also prevents impurities from entering the engine and causing damage to precision components such as fuel pumps and injectors.

The improvement of the above technical solution is:

It includes a filter layer and a hydrophobic pipe assembly vertically concentrically arranged, a hydrophobic cavity is formed between the filter layer and the hydrophobic pipe assembly, the inside of the hydrophobic pipe assembly is a flow channel, and the filter screen is arranged on the outer periphery of the hydrophobic pipe assembly.

As a further improvement of the above technical solution:

A diversion surface is arranged on the top of the drain pipe assembly, and the safety valve is arranged just above the diversion surface.

The guide surface is a closed arc-shaped spherical surface that protrudes toward the end cover.

In the utility model, a closed arc-shaped spherical surface is arranged below the safety valve, so that the fuel can be evenly guided and distributed into the hydrophobic cavity through the arc-shaped flow-guiding surface.

The umbrella part of the safety valve includes a central shaft and a top annular part. The moving part of the safety valve is sleeved on the central shaft through clearance fit; The inner circumferential surface of the upper support plate is matched; the seal is fixed on the upper end surface of the upper support plate, an elastic element is arranged between the upper support plate and the lower support plate, and the lower support plate is nested in the groove of the central shaft.

The moving part of the utility model is sleeved on the central axis of the umbrella-shaped part, and an elastic element is arranged between the moving part and the lower support plate. When the filter layer is blocked, the pressure difference between the inside and outside compresses the spring, so that the sealing part of the moving part slides down. , so that the inside and outside of the filter element are connected.

The bottom of the center shaft is provided with an opening.

The utility model is provided with an opening at the bottom of the central shaft, which can provide a certain elastic deformation to the bottom of the central shaft, which is beneficial for the annular lower support plate to be nested in the groove of the central shaft after pressing the opening.

The top annular portion of the umbrella-shaped member is provided with a through space, and the bottom surface of the top annular portion has a protruding tip portion.

The utility model is provided with a protruding tip portion on the umbrella-shaped piece, and when the safety valve is in a sealed state, the protruding tip portion on the umbrella-shaped piece can be partially pressed into the sealing piece to improve the sealing effect.

A filter screen is arranged above the umbrella-shaped piece of the safety valve, and a plurality of through holes are opened on the filter screen.

In the utility model, a filter screen piece is arranged above the umbrella-shaped piece, and the filter screen piece can roughly filter the inflowing fuel oil.

The outer end of the filter screen is provided with a gasket.

The gasket of the utility model is pressed into the stepped hole of the upper end cover after being squeezed and deformed, and the inner circumferential surface of the stepped hole is pressed tightly to limit the position of the safety valve.

An air hole is provided on the top of the protrusion of the upper end cover.

The air hole of the utility model is arranged on the top of the protrusion of the upper end cover, which can prevent the floating object inside the filter element from blocking the air hole and effectively avoid the problem of air resistance.

The beneficial effects of the present utility model are as follows:

In the utility model, a safety valve is arranged on the upper end cover of the drain pipe assembly, the top of the drain pipe assembly is provided with a flow guide surface, and the flow guide surface is a closed arc-shaped spherical surface. When the filter layer is blocked, the internal and external pressure difference in the drain pipe assembly overcomes the spring pressure of the safety valve, so that the safety valve is opened downward, and the diesel oil enters the filter element through the safety valve, along the arc spherical surface at the top of the drain pipe assembly. It flows into the hydrophobic cavity, and the impurities and water are filtered from the hydrophobic cavity through the filter screen on the hydrophobic pipe assembly. The filtered diesel oil enters the internal flow channel of the hydrophobic pipe assembly and then is transported to the engine, ensuring the normal operation of the engine. , so that the vehicle remains in normal operation. Diesel is filtered by the hydrophobic net and then delivered to the engine, preventing impurities from entering the engine and causing damage to precision components such as fuel pumps and injectors.

The air hole of the utility model is arranged on the convex top of the upper end cover to avoid blocking the air hole due to the floating object inside the filter element reaching the top of the upper end cover, effectively avoiding the occurrence of air resistance and affecting the normal running of the vehicle.

Description of drawings

FIG. 1 is a schematic diagram of a conventional structure.

FIG. 2 is a schematic three-dimensional cross-sectional view of the utility model.

FIG. 3 is a schematic structural diagram of the utility model.

FIG. 4 is an enlarged view of part A in FIG. 3 .

FIG. 5 is a schematic view of the opening of the safety valve of the present invention.

FIG. 6 is an enlarged view of part B in FIG. 5 .

Fig. 7 is a perspective view of the umbrella.

In the figure: 1. Upper end cap; 2. Filter layer; 3. Drain pipe assembly; 4. Safety valve; 5. Air hole; 6. Diversion surface; 7. Drainage cavity; 8. Filter screen; 10. Gasket; 11. Filter sheet; 12. Center shaft; 13. Umbrella; 14. Press plate; 15. Seal; 16. Upper support plate; 17. Spring; 18. Lower support plate; 19. Step 20, through holes; 21, spokes; 22, grooves; 23, openings.

Detailed ways

The specific embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in Figure 2 and Figure 3, the present utility model is provided with a filter layer 2 and a hydrophobic tube assembly 3 vertically and concentrically between the circular upper end cap 1 and the lower end cap (not shown in the figure), and the filter layer 2 will The filter element is divided into inner and outer parts; the drain pipe assembly 3 is a cylindrical structure and is located in the center of the inner part of the filter element. A filter screen 8 is provided on the outer periphery of the water-repellent pipe assembly 3 through the support ribs. A water-repellent cavity 7 is formed between the outside of the filter screen 8 and the filter layer 2 , and the inside is a flow channel 9 . The top of the drain pipe assembly 3 is provided with a guide surface 6, and the guide surface 6 is a closed arc-shaped spherical surface that protrudes toward the end cover. The arc-shaped spherical surface and the drain pipe assembly 3 can be integrally injection-molded or assembled.

As shown in FIG. 3 to FIG. 6 , the upper end cover 1 is provided with a through hole 20 and a stepped surface 19 , and a safety valve 4 is arranged in the through hole 20 , and the safety valve 4 is arranged in the area just above the guide surface 6 , so that it can be After the diesel oil flows in from the safety valve 4 , it is evenly distributed into the annular hydrophobic cavity 7 through the arc-shaped guide surface 6 .

As shown in FIG. 4 , FIG. 6 , and FIG. 7 , the umbrella 13 of the safety valve 4 includes a central shaft 12 and a top annular portion, the lower outer periphery of the central shaft 12 has a groove 22 , and the bottom of the central shaft 12 is located below the groove 22 An opening portion 23 is provided to provide a certain elastic deformation; the top annular portion of the umbrella-shaped member 13 is located at the top of the central shaft 12, the top annular portion is composed of an inner ring and an outer ring connected by the spokes 21, and the top annular portion is adjacent to the spokes A through space is formed between 21; the bottom surface of the inner ring and the outer ring of the top annular part has a protruding tip, when the safety valve 4 is in a sealed state, the tip of the top annular part can be partially pressed into the seal 15 to improve the sealing effect . The annular seal 15 is fixed on the upper end surface of the annular upper support plate 16, the two are located below the annular portion, and are jointly sleeved on the outer periphery of the central shaft 12 by clearance fit; the outer cylindrical surface of the annular seal 15 is on the upper end cover 1. The inner circumferential surface of the through hole 20 is matched. After the annular lower support plate 18 is pressed against the bottom opening 23 of the central shaft 12 , it is nested in the groove 22 of the central shaft 12 . The bottom surface of the upper support plate 16 and the top surface of the lower support plate 18 are both provided with annular grooves, and the upper and lower end surfaces of the spring 17 are respectively placed in the annular grooves of the upper support plate 16 and the lower support plate 18 to stabilize the spring 17, and the spring 17 is sleeved in the center. The outer circumference of the shaft 12; other elastic elements can also be arranged between the upper support plate 16 and the lower support plate 18. Under the action of the elastic force of the spring 17 , the sealing member 15 and the upper support plate 16 can slide up and down along the central axis 12 . A pressure plate 14 is arranged below the outer ring of the annular portion of the umbrella-shaped member 13, the upper end surface of the pressure plate 14 is in contact with the lower end surface of the outer ring, and the lower end surface of the pressure plate 14 is located on the step surface 19 of the upper end cover 1; the top of the umbrella-shaped member 13 A filter screen 11 is arranged above the annular part, and a number of through holes are opened on the filter screen 11, which can be used for rough filtration of diesel oil; a gasket 10 is arranged on the top of the filter screen 11, and the gasket 10 is pressed into the upper end cover 1 after being squeezed and deformed. In the stepped hole, press the inner circumferential surface of the stepped hole tightly to limit the safety valve 4.

As shown in Fig. 3 to Fig. 6 , the upper end cover 1 on the side of the safety valve 4 is partially raised upward, and the air hole 5 is arranged on the top of the protrusion. To avoid blocking the air hole 5 due to floating objects inside the filter element. The air hole 5 is a conical through hole with a small outside and a large inside. The large diameter end of the air hole 5 is connected with the inner end face of the upper end cover 1 by a rounded corner. When external impurities enter through the air hole 5, the impurities can follow the cone of the cone hole. When the floating impurities in the filter element reach the top of the upper end cover 1 and block the air holes 5, the impact generated by the shaking of diesel oil can wash the impurities on the conical air holes 5 during the running of the vehicle. The large diameter end of the conical air hole 5 is set to a rounded corner, which is not easy to trap impurities, and prevents the air hole 5 from losing the function of exhaust due to clogging.

When the utility model is actually used, the safety valve 4 is in a sealed state when the filter layer 2 is in a normal working state. As shown in Figures 3 and 4 , the sealing member 15 of the safety valve 4 is located in the through hole 20 of the upper end cover 1, and the sealing The upper end surface of the element 15 is in pressing contact with the tip of the umbrella-shaped element 13 to form a seal inside the filter element. If the impurities accumulated in the diesel filter element block the filter layer 2, the inside of the hydrophobic cavity 7 will form a negative pressure in the interior of the hydrophobic cavity 7 due to the action of the fuel pump on the engine, and the pressure difference between the inside and outside compresses the spring 17, causing the seal 15 to slide down, as shown in Figure 5 6, the sealing member 15 descends away from the inner diameter of the through hole 20, and the inner and outer spaces are no longer sealed. At this time, the diesel oil outside the filter element passes through the filter screen 11 of the safety valve 4 and between the spokes 21 of the umbrella 13. The space and the through holes 20 of the upper end cover 1 flow into the filter element, and flow into the hydrophobic cavity 7 through the guide surface 6 at the top of the hydrophobic pipe assembly 3 evenly distributed. The filtered impurities and water flow into the water collecting cavity from the hydrophobic cavity 7 to be discharged, and the filtered diesel oil enters the flow channel 9 of the drain pipe assembly 3, and is transported from the flow channel 9 to the engine, which ensures the normal operation of the engine, so that the vehicle maintains normal operation. The diesel oil is filtered by the filter screen 8 and then sent to the engine to prevent impurities from entering the engine and causing damage to precision components such as the fuel pump and the fuel injector. The air hole 5 of the present invention is arranged on the convex top of the upper end cover 1 to prevent the floating object reaching the top of the upper end cover 1 from blocking the air hole 5, effectively avoiding the occurrence of air resistance and affecting the normal running of the vehicle.

The above description is an explanation of the present utility model, not a limitation of the present utility model. The present utility model can be modified in any form without departing from the spirit of the present utility model.

Claims (10)

1. The utility model provides a fuel filter core with relief valve which characterized in that: the safety valve (4) is arranged on the end cover surface of the filter element, the drainage cavity (7) is separated from the outside by the sealing piece (15) of the safety valve (4) under normal conditions, and the sealing piece (15) moves under pressure in an emergency state and is communicated inside and outside; a filter screen (8) is arranged between the drainage cavity (7) and the flow channel (9) to filter the fuel.

2. A fuel filter cartridge having a relief valve as set forth in claim 1, wherein: including vertical filter bed (2) and drain pipe assembly (3) of concentric setting, be hydrophobic cavity (7) between filter bed (2) and drain pipe assembly (3), drain pipe assembly (3) inside is runner (9), and filter screen (8) set up in drain pipe assembly (3) periphery.

3. A fuel filter cartridge having a relief valve as set forth in claim 1, wherein: a flow guide surface (6) is arranged at the top of the drain pipe assembly (3), and the safety valve (4) is arranged right above the flow guide surface (6).

4. A fuel filter cartridge having a relief valve as set forth in claim 3, wherein: the flow guide surface (6) is a closed arc spherical surface protruding towards the end cover.

5. A fuel filter cartridge having a relief valve as set forth in claim 1, wherein: the umbrella-shaped part (13) of the safety valve (4) comprises a central shaft (12) and a top annular part, the moving part of the safety valve (4) is sleeved on the central shaft (12) through clearance fit, the moving part of the safety valve (4) comprises a sealing element (15), and the outer cylindrical surface of the sealing element (15) is matched with the inner circumferential surface of the through hole (20) of the upper end cover (1); the sealing element (15) is fixed on the upper end surface of the upper support plate (16), an elastic element is arranged between the upper support plate (16) and the lower support plate (18), and the lower support plate (18) is nested in the groove (22) of the central shaft (12).

6. A fuel filter cartridge having a safety valve as set forth in claim 5, wherein: an opening (23) is provided at the bottom of the center shaft (12).

7. A fuel filter cartridge having a safety valve as set forth in claim 5, wherein: a through space is provided on the top annular part of the umbrella-shaped member (13), and the bottom surface of the top annular part has a protruding tip.

8. A fuel filter cartridge having a relief valve as set forth in claim 1, wherein: a filter screen sheet (11) is arranged above an umbrella-shaped part (13) of the safety valve (4), and a plurality of through holes are formed in the filter screen sheet (11).

9. A fuel filter cartridge having a relief valve as set forth in claim 8, wherein: the outer end of the filter screen sheet (11) is provided with a gasket (10).

10. A fuel filter cartridge having a relief valve as set forth in claim 1, wherein: an air hole (5) is arranged at the top of the bulge of the upper end cover (1).

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