A high pressure fuel filter with a pressure relief valve

Abstract

The utility model relates to fuel filter technical field, and disclose a kind of high-pressure fuel filter with pressure relief valve, including upper shell and lower shell, the upper shell and lower shell are connected between by flange, and form T-shaped structure, the end of upper shell is provided with the anti-reflux component of preventing fuel reflux, the inside of lower shell is provided with the filter screen of filtering fuel impurity.The high-pressure fuel filter with pressure relief valve, the filter screen of being set as barrel can filter the impurity in fuel, and by the setting of helical scraper, fuel can flow in the flow channel formed by helical scraper, and when fuel flows in barrel filter screen, rotating member drives helical scraper to move, and the impurity on the circumference of barrel filter screen is scraped into the bottom end of lower shell, subsequently, by opening pressure relief valve, fuel inside lower shell can be discharged by pressure relief valve with impurity, realize the cleaning of filter screen, and discharge the impurity in lower shell.

Description

Technical Field

[0001] This utility model relates to the field of fuel filter technology, specifically a high-pressure fuel filter with a pressure relief valve. Background Technology

[0002] Fuel filters are an essential component of the fuel system. Their main function is to remove solid particles, moisture, and other impurities from the fuel, ensuring that the fuel entering the engine is pure and uncontaminated. By improving fuel quality, fuel filters effectively protect delicate components such as the fuel pump and injectors, extending their lifespan, while also optimizing combustion efficiency and reducing emissions.

[0003] A prior patent (publication number: CN217421391U) discloses a fuel filter, comprising: a filter body having an inner cavity with an inlet and an outlet communicating with the inner cavity; and a filter element disposed in the inner cavity, comprising at least two inner and outer distributed filter surfaces, wherein the pore diameter of the outer filter surface is larger than that of the inner filter surface; wherein the inlet communicates with a space in the inner cavity located outside the filter element, and the inner space formed by the innermost filter surface of the filter element communicates with the outlet; compared with the prior art, this utility model can filter impurities of different sizes separately, reducing the accumulation of impurities on the filter surface and thus reducing the impact on fuel flow.

[0004] When in use, the above-mentioned filter can filter impurities of different sizes separately, reducing the accumulation of impurities on the filter surface and thus reducing the impact on fuel flow. However, impurities will still accumulate during use. Furthermore, due to the two filter surfaces inside, after prolonged use, they become clogged and require the filter body to be removed to clean the impurities on the filter surfaces, which is quite cumbersome. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a high-pressure fuel filter with a pressure relief valve, which has advantages such as easy cleaning of the filter screen and convenient removal of impurities, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-pressure fuel filter with a pressure relief valve, comprising an upper shell and a lower shell, wherein the upper shell and the lower shell are connected by a flange and form a T-shaped structure, and one end of the upper shell is provided with an anti-backflow component to prevent fuel backflow;

[0007] The lower housing has a filter screen for filtering fuel impurities. The filter screen has a cylindrical structure. A rotating component is rotatably connected to the inner bottom wall of the lower housing. A spiral scraper is fixedly connected to the upper surface of the rotating component, which contacts the circumferential surface of the filter screen. The spiral scraper is in contact with the inner wall of the lower housing. An oil inlet pipe is installed inside the upper housing and is connected to the lower housing. An oil outlet pipe is installed inside the lower housing and is fixedly connected to the upper part of the filter screen. The oil outlet pipe is located inside the oil inlet pipe, and one end of it passes through the oil inlet pipe.

[0008] Furthermore, a sealing ring is provided between the end of the oil inlet pipe and the end of the oil outlet pipe located inside the upper shell and the inner wall of the upper shell.

[0009] The above solution allows the sealing rings to seal the connection between the inlet and outlet pipes and the upper housing, ensuring that fuel enters from the inlet pipe and exits from the outlet pipe.

[0010] Furthermore, a pressure relief valve is fixedly installed at the bottom end of the lower shell.

[0011] The above-described design allows the pressure relief valve to assist in relieving pressure inside the lower shell, and during the pressure relief process, it also allows impurities accumulated inside the lower shell to be discharged through the pressure relief valve.

[0012] Furthermore, the anti-backflow component includes a fixed ring fixedly connected to the inner wall of the upper shell. The fixed ring has multiple circumferentially distributed oil inlet holes on its side. A baffle is provided on one side of the fixed ring. The baffle is fixedly connected to multiple circumferentially distributed plugs on the corresponding side of the fixed ring. Each plug is slidably inserted into the corresponding oil inlet hole.

[0013] With the above scheme, the block can seal the oil inlet. When the pressure at one end of the upper shell increases, the baffle will separate from the fixed ring, thereby separating the block from the oil inlet and allowing fuel to enter the oil inlet pipe through the oil inlet.

[0014] Furthermore, the anti-backflow component also includes a margin groove opened on one side of the baffle corresponding to the fixing ring, and a spring is fixedly connected to the inner wall of the margin groove, with the other end of the spring fixedly connected to the fixing ring.

[0015] With the above scheme, the spring can drive the baffle to reset after the fuel stops flowing, so that multiple plugs can be inserted into the corresponding oil inlet holes, thereby achieving sealing and preventing fuel backflow.

[0016] Furthermore, the anti-backflow assembly also includes multiple insert rods that are slidably inserted into the inner wall of the upper shell, and the other end of each insert rod is fixedly connected to the baffle plate.

[0017] The above scheme allows the inserted rod to guide the baffle, enabling the baffle to move axially along the upper shell.

[0018] Furthermore, a fixing bracket is fixedly installed on the circumferential surface of the upper shell.

[0019] The above-described design allows for easy securing of the upper shell by the workers.

[0020] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0021] This high-pressure fuel filter with a pressure relief valve filters impurities in the fuel through a cylindrical filter screen. The spiral scraper allows fuel to flow through a channel formed by the scraper. As the fuel flows within the cylindrical filter screen, a rotating component drives the spiral scraper, scraping impurities from the circumference of the filter screen into the bottom of the lower housing. Then, by opening the pressure relief valve, the fuel carrying impurities inside the lower housing is discharged through the valve, thus cleaning the filter screen and removing impurities from the lower housing. Attached Figure Description

[0022] Figure 1 Cross-sectional view of the overall structure of this application Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the overall structure of this application;

[0024] Figure 3 This is a schematic diagram of the anti-backflow component structure of this application;

[0025] Figure 4 This is a schematic diagram of the overall structure of this application. Figure 2 .

[0026] In the picture:

[0027] 1. Upper shell; 2. Lower shell; 3. Anti-backflow component;

[0028] 301. Retaining ring; 302. Oil inlet; 303. Baffle plate; 304. Plug; 305. Reservoir groove; 306. Spring; 307. Insert rod;

[0029] 4. Filter screen; 5. Rotating parts; 6. Spiral scraper; 7. Oil inlet pipe; 8. Oil outlet pipe; 9. Sealing ring; 10. Pressure relief valve; 11. Fixed bracket. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] Please see Figures 1-4 In this embodiment, a high-pressure fuel filter with a pressure relief valve includes an upper shell 1 and a lower shell 2. The upper shell 1 and the lower shell 2 are connected by a flange and form a T-shaped structure. One end of the upper shell 1 is provided with an anti-backflow component 3 to prevent fuel backflow.

[0032] The lower housing 2 has a filter screen 4 for filtering fuel impurities. The filter screen 4 has a cylindrical structure. A rotating component 5 is rotatably connected to the inner bottom wall of the lower housing 2. The bottom end of the rotating component 5 is fixedly connected to the output end of an external motor. A spiral scraper 6 is fixedly connected to the upper surface of the rotating component 5, which contacts the circumferential surface of the filter screen 4, and the spiral scraper 6 contacts the inner wall of the lower housing 2. The upper housing 1 has an oil inlet pipe 7 that communicates with the lower housing 2. The lower housing 2 has an oil outlet pipe 8 that is fixedly connected to the upper end of the filter screen 4. The oil outlet pipe 8 is located at the oil inlet pipe 7. Inside, one end passes through the oil inlet pipe 7, and the cylindrical filter screen 4 filters impurities in the fuel. During the filtration process, the spiral scraper 6 is designed so that the fuel flows through the flow channel formed by the spiral scraper 6 structure. The rotating part 5 drives the spiral scraper 6 to rotate, so that the spiral scraper 6 can clean the circumferential surface of the filter screen 4 and push the impurities to the bottom of the lower shell 2. The upper shell 1 is fixedly mounted with a fixing bracket 11 on its circumferential surface. The fixing bracket 11 makes it easy for the staff to fix the upper shell 1.

[0033] Both the inlet pipe 7 and the outlet pipe 8 are fitted with sealing rings 9 between their ends inside the upper shell 1 and the inner wall of the upper shell 1. The sealing rings 9 can seal the connection between the inlet pipe 7 and the outlet pipe 8 and the upper shell 1, ensuring that fuel enters from the inlet pipe 7 and exits from the outlet pipe 8. A pressure relief valve 10 is fixedly installed at the bottom of the lower shell 2. The pressure relief valve 10 can assist in depressurizing the lower shell 2 and allow impurities accumulated inside the lower shell 2 to be discharged through the pressure relief valve 10 during the depressurization process.

[0034] The backflow prevention assembly 3 includes a fixed ring 301 fixedly connected to the inner wall of the upper shell 1. Multiple circumferentially distributed oil inlet holes 302 are provided on the side of the fixed ring 301. A baffle 303 is provided on one side of the fixed ring 301. Multiple circumferentially distributed plugs 304 are fixedly connected to the baffle 303 on the corresponding side of the fixed ring 301. Each plug 304 is slidably inserted into the corresponding oil inlet hole 302. The plugs 304 can seal the oil inlet hole 302. When the pressure at one end of the upper shell 1 increases, the baffle 303 will separate from the fixed ring 301, thereby separating the plugs 304 from the oil inlet holes 302, allowing fuel to enter the oil inlet pipe 7 through the oil inlet holes 302. The backflow prevention assembly 3 also includes a baffle. A clearance groove 305 is provided on one side of the fixed ring 301. A spring 306 is fixedly connected to the inner wall of the clearance groove 305. The other end of the spring 306 is fixedly connected to the fixed ring 301. The spring 306 can drive the baffle 303 to reset through the deformation force of the spring 306 after the fuel stops flowing, so that multiple plugs 304 are inserted into the corresponding oil inlet holes 302, thereby achieving sealing and preventing fuel backflow. The anti-backflow component 3 also includes multiple insert rods 307 that are slidably inserted into the inner wall of the upper shell 1. The other end of each insert rod 307 is fixedly connected to the baffle 303. The insert rods 307 can provide guidance for the baffle 303, so that the baffle 303 moves along the axial direction of the upper shell 1.

[0035] The working principle of the above embodiment is as follows: First, when the vehicle is started, the pipe connected to the upper shell 1 can deliver fuel to the interior of the upper shell 1, which increases the pressure at the oil inlet end of the upper shell 1, pushes the baffle 303 to slide along the axial direction of the upper shell 1 and stretches the spring 306, and causes multiple plugs 304 to separate from the oil inlet hole 302. Then, the fuel can enter the oil inlet pipe 7 through the oil inlet hole 302 and enter the interior of the lower shell through the oil inlet pipe 7, so that the fuel flows through the spiral scraper 6 to form a flow channel, passes through the filter screen 4, and then enters the oil outlet pipe 8. It is then discharged into the oil outlet end of the upper shell 1 through the oil outlet pipe 8 and discharged into the external pipe.

[0036] During the fuel filtration process, impurities in the fuel adhere to the circumferential surface of the filter screen 4. The rotating part 5 is driven by an external motor to rotate, which in turn drives the spiral scraper 6 to rotate synchronously and scrape off the impurities on the surface of the filter screen 4, allowing the impurities to accumulate at the bottom of the lower shell 2. When depressurization is performed, the pressure relief valve 10 is opened, allowing the fuel inside the lower shell 2 to carry the impurities out through the pressure relief valve 10, thereby cleaning the filter screen and facilitating the removal of impurities.

[0037] When the vehicle stops, the deformation force of the spring 306 can drive the baffle 303 to reset, allowing multiple plugs 304 to be inserted into the corresponding oil inlet 302, thereby sealing the oil inlet 302 and preventing fuel backflow.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-pressure fuel filter with a pressure relief valve, comprising an upper shell (1) and a lower shell (2), characterized in that: The upper shell (1) and the lower shell (2) are connected by a flange and form a T-shaped structure. One end of the upper shell (1) is provided with an anti-backflow component (3) to prevent fuel backflow. The lower shell (2) is equipped with a filter screen (4) for filtering fuel impurities. The filter screen (4) has a cylindrical structure. The inner bottom wall of the lower shell (2) is rotatably connected to a rotating part (5). The upper surface of the rotating part (5) is fixedly connected to a spiral scraper (6) that contacts the circumferential surface of the filter screen (4). The spiral scraper (6) contacts the inner wall of the lower shell (2). The upper shell (1) is equipped with an oil inlet pipe (7) that communicates with the lower shell (2). The lower shell (2) is equipped with an oil outlet pipe (8) that is fixedly connected to the upper end of the filter screen (4). The oil outlet pipe (8) is located inside the oil inlet pipe (7), and one end of it passes through the oil inlet pipe (7).

2. A high-pressure fuel filter with a pressure relief valve according to claim 1, characterized in that: The oil inlet pipe (7) and the oil outlet pipe (8) are both provided with sealing rings (9) between their ends inside the upper shell (1) and the inner wall of the upper shell (1).

3. A high-pressure fuel filter with a pressure relief valve according to claim 1, characterized in that: A pressure relief valve (10) is fixedly installed at the bottom of the lower shell (2).

4. A high-pressure fuel filter with a pressure relief valve according to claim 1, characterized in that: The anti-backflow component (3) includes a fixing ring (301) fixedly connected to the inner wall of the upper shell (1). The side of the fixing ring (301) is provided with a plurality of circumferentially distributed oil inlet holes (302). A baffle (303) is provided on one side of the fixing ring (301). A plurality of circumferentially distributed plugs (304) are fixedly connected to the baffle (303) on the side of the fixing ring (301). Each plug (304) is slidably inserted into the corresponding oil inlet hole (302).

5. A high-pressure fuel filter with a pressure relief valve according to claim 4, characterized in that: The anti-backflow component (3) also includes a margin groove (305) opened on one side of the baffle (303) corresponding to the fixing ring (301). A spring (306) is fixedly connected to the inner wall of the margin groove (305), and the other end of the spring (306) is fixedly connected to the fixing ring (301).

6. A high-pressure fuel filter with a pressure relief valve according to claim 4, characterized in that: The anti-backflow assembly (3) also includes a plurality of insert rods (307) that are slidably inserted into the inner wall of the upper shell (1), and the other end of each insert rod (307) is fixedly connected to the baffle (303).

7. A high-pressure fuel filter with a pressure relief valve according to claim 1, characterized in that: A fixing bracket (11) is fixedly installed on the circumferential surface of the upper shell (1).

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