Low-resistance coalescence type light-weight fuel filter

Abstract

A shell comprises an upper shell body and a lower shell body, the upper shell body and the lower shell body are connected in a sealing mode, and a coalescence filter element is arranged in a cavity defined by the upper shell body and the lower shell body. The upper shell is provided with an oil inlet and outlet, an annular oil inlet cavity is defined between the coalescence filter element and the inner wall of the shell, and the oil inlet cavity is communicated with the oil inlet through an oil inlet pipe; an electric pump is arranged in the upper shell, the upper shell is an aluminum casting, and the lower shell is a plastic part; a center hole of the coalescence filter element is connected with an electric pump and a diaphragm one-way valve through an oil outlet pipe, and an outlet of the diaphragm one-way valve and an outlet of the electric pump are both communicated with the oil outlet; the diameters of the oil inlet pipe and the oil outlet pipe are greater than or equal to 15mm; the electric pump is used for avoiding unsmooth fuel supply when the engine is started. By increasing the diameter of an oil way, simplifying the structure of the oil way and arranging the diaphragm one-way valve, the oil resistance of the fuel filter is reduced; fuel consumption of the motor vehicle is reduced, and the problem that an engine is difficult to start is solved. And the electric pump forcibly pumps oil to prevent the engine from being unable to start under low-temperature conditions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fuel filter system for vehicle, especially to a low-resistance coalescence type lightweight fuel filter. BACKGROUND

[0002] With the continuous progress of automobile filtration technology, the industry has improved the basic performance indicators such as impurity filtration efficiency and water separation capacity of fuel filters to a high level, basically meeting the demand of fuel system for pure fuel. However, the current technology development has shifted from simply pursuing initial performance to more comprehensive demand: on the one hand, users have higher requirements for the full life cycle performance of fuel filters, emphasizing that they need to maintain stable filtration efficiency and water separation capacity in long-term use; on the other hand, the trend of intelligence and automation promotes the integration of electric auxiliary modules (such as intelligent pumping, heating, and drainage system) in fuel filters to improve user experience.

[0003] Despite continuous technological iteration, traditional fuel filters still have defects, especially the problem of engine performance decline caused by excessively high flow resistance, which is manifested in:

[0004] Reduced fuel economy: high flow resistance forces the fuel pump to consume more energy, leading to increased fuel consumption;

[0005] Difficulty in cold start: in low-temperature environments, the decline in fuel flowability combined with high flow resistance exacerbates the risk of engine start failure;

[0006] Increased emissions and wear: insufficient fuel supply leads to incomplete combustion, increasing pollutant emissions and accelerating fuel pump wear.

[0007] The root cause of the above problems lies in the technical limitations of traditional design:

[0008] Unreasonable oil passage design: the main oil passage diameter of the coalescence type lightweight fuel filter is usually 9.49-9.89 mm, and the narrow channel significantly increases the flow resistance. Increasing the oil passage diameter requires increasing the size of the spring check valve to maintain the sealing pressure, leading to the expansion of the valve body, which conflicts with the compact design requirements of the filter, sacrificing product lightweight and space utilization. Therefore, the oil passage diameter cannot be arbitrarily increased under the existing technical conditions.

[0009] Defects caused by check valves: spring check valves are commonly used in existing technologies, and fuel needs to overcome the spring force and valve core friction to pass through, and the additional resistance cannot be ignored;

[0010] Complex oil path layout: the oil passage is bent too much, and the fuel flow path is circuitous, significantly increasing the resistance along the way.

[0011] In addition, although the coalescence filter core technology (high-efficiency water separation is realized through three-stage filtration of "coalescence + demulsification + separation") and intelligent modules (such as automatic heating and drainage) have been applied in some products, the synergistic optimization of the same with the low-flow resistance design is still insufficient. For example, the integration of the traditional intelligent module can further sacrifice the oil passage patency, resulting in the aggravation of the flow resistance contradiction.

[0012] Therefore, there is an urgent need for a fuel filter that takes into account efficient filtration, low-flow resistance design and intelligent function, meets the performance requirements throughout the life cycle, and completely solves the engine performance bottleneck caused by excessively high flow resistance, in line with the development trend of lightweight, automation and energy saving and emission reduction in the automotive industry. Content of the utility model

[0013] The utility model discloses a low resistance coalescence type lightweight fuel filter, reduce the oil resistance of fuel filter, and give consideration to lightweight and compactness.

[0014] To realize above-mentioned purpose, a low resistance coalescence type lightweight fuel filter of the utility model includes the shell, the shell includes upper shell and lower shell, and the upper shell is connected with the lower shell sealingly, and the cavity surrounded by the upper shell and the lower shell has the coalescence filter core in the shape of a cylinder;The upper shell is equipped with the oil inlet and the oil outlet, and the annular oil inlet cavity is formed between the coalescence filter core and the inner wall of the shell, and the oil inlet cavity is communicated with the oil inlet through the oil inlet pipe;The electric pump is arranged in the upper shell,

[0015] The upper shell is a cast aluminum part, and the lower shell is a plastic part;The central hole of the coalescence filter core is connected with the electric pump and the diaphragm one-way valve through the oil outlet pipe, and the outlet of the diaphragm one-way valve and the outlet of the electric pump are communicated with the oil outlet;The diameter of the oil inlet pipe and the oil outlet pipe is greater than or equal to 15mm;The electric pump is used to avoid poor fuel supply when the engine starts.

[0016] The diaphragm one-way valve includes a valve seat, and a mesh oil passage is arranged on the valve seat;The umbrella-shaped rubber diaphragm is arranged on the valve seat through the barb structure, and the setting direction of the umbrella-shaped rubber diaphragm is towards the oil outlet;The valve seat is sealingly matched with the hole wall of the oil outlet pipe through the valve seat sealing ring.

[0017] The coalescence filter core includes upper end cover and lower end cover, and the cylindrical filter layer is connected between the upper end cover and the lower end cover, and the cylindrical filter layer includes filter layer, coalescence layer, support framework and separation layer made of hydrophobic and oleophilic material from outside to inside in the radial direction;The annular cavity is formed between the support framework and the separation layer;

[0018] The lower end cover is embedded with the lower sealing ring on the radial outer wall, and the tight sealing cooperation is formed between the lower sealing ring and the inner wall of the lower shell;

[0019] The center of the separation layer is provided with the central hole, and the upper end cover is provided with a sealing sleeve communicated with the central hole, and the oil outlet pipe is inserted into the sealing sleeve and is interference-fitted with the sealing sleeve.

[0020] The coalescing filter and the lower shell below it enclose a water accumulation cavity, and the water accumulation cavity is provided with a water level sensor, a water level alarm, a heater, a drain valve interface and a connector; the water level sensor, the water level alarm and the heater are connected with the connector, and the connector is used for connecting a vehicle-mounted circuit; the heater is higher than the alarm water level of the water level alarm.

[0021] The utility model has the advantages of the following:

[0022] The core improvement of the utility model is that the technical scheme of the diaphragm check valve+large oil passage is adopted to replace the traditional technical scheme of the spring check valve+small oil passage.

[0023] Table 1

[0024]

[0025] The utility model discloses by increasing the oil passage diameter, simplifying the oil passage structure (the existing product fuel flow path is circuitous), reduce the oil resistance of the fuel filter;The diaphragm check valve further reduces the oil resistance of the fuel filter compared with the spring check valve used before. The reduction of oil resistance is conducive to reducing the fuel consumption of the motor vehicle using the fuel filter, and at the same time, even without the electric pump, the problem of difficult engine starting caused by insufficient oil pumping can be alleviated after the oil resistance is reduced, and of course, the engine can also be avoided after the electric pump is closed.

[0026] The electric pump in the utility model starts when the engine starts, and forcibly pumps oil to the engine, so that the problems of poor fuel supply and difficult engine starting caused by low oil temperature and viscosity can be eliminated, and the engine can also be normally started under extremely low temperature conditions.

[0027] The utility model discloses by setting the diaphragm check valve in the oil outlet oil passage, after increasing the oil passage diameter, the product lightweight and space utilization rate are not sacrificed, so that the technical scheme of increasing the oil passage diameter is realized.

[0028] The upper shell is provided with an oil inlet and an oil outlet connected to the outside, and is internally provided with structures such as a check valve and an electric pump, which requires high structural strength. In the utility model, the upper shell is an aluminum casting, and the lower shell is a plastic part, forming an aluminum-plastic composite shell structure, which not only meets the need of structural strength, but also meets the design goal of lightweight.

[0029] The diaphragm check valve structure is simple, small in size and light in weight. In the design of the diaphragm check valve, the oil pipe diameter is increased while the lightweight and compactness are still considered, and the core reason lies in the synergistic optimization of the structural characteristics, material selection and space layout of the diaphragm check valve.

[0030] The diaphragm check valve is only composed of a plastic valve seat, a sealing ring and an umbrella-shaped rubber diaphragm, does not need complex components such as a spring and a valve core, and has an axial space occupation reduced by more than 60% (compared with a traditional spring check valve). In a radial layout, the umbrella-shaped rubber diaphragm is fixed to a center hole of the valve seat through a barb structure, is only dependent on elasticity of the diaphragm for opening and closing, and does not need a spring compression space; fuel can directly diffuse through the diaphragm after passing through a mesh oil passage, and does not need an additional flow guide cavity.

[0031] In comparison, the traditional spring check valve needs to reserve a spring compression stroke and a valve core activity space, so that the valve body is proportionally expanded when the oil passage diameter is increased; the radial opening and closing characteristics of the diaphragm check valve decouple the valve body volume and the oil passage diameter, so that when the oil passage diameter is increased from 9.89 mm to 15.82 mm, the valve body volume is only increased by about 20%, and space is significantly saved.

[0032] The coalescing filter element has a simple structure and can effectively filter fuel and remove water in the fuel.

[0033] In addition, the utility model can realize automatic drainage of the product, solve many inconveniences of manual drainage of the terminal user in the limited space, heating can heat the fuel, and the temperature of the fuel is prevented from being too low to cause the fuel to be viscous. Integrated electrical components are all modularly designed, can be increased or decreased in combination with actual use requirements, realize standardization and platform development of a product structure. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a sectional view structure schematic diagram of the utility model.

[0035] Figure 2 is a structure schematic diagram of the coalescing filter element.

[0036] Figure 3 is a partial sectional view of the utility model by vertical plane cutting of the check valve, Figure 3 mainly used for showing an oil passage structure of an oil inlet pipe, an oil outlet pipe and a diaphragm check valve.

[0037] Figure 4 is Figure 3 is an enlarged view of A in the middle, used for expressing related structures of the diaphragm check valve.

[0038] Figure 5 is a top view structure schematic diagram of a water accumulation cavity below the heater. DETAILED DESCRIPTION

[0039] As Figures 1 to 5As shown, the low-resistance coalescence type light-weight fuel filter of the utility model includes a shell, the shell includes upper shell 1 and lower shell 2, upper shell 1 is connected with lower shell 2 by screw thread and is equipped with shell sealing ring 3 at the joint, the cavity surrounded by upper shell 1 and lower shell 2 has coalescence filter core 4 in the shape of a cylinder;Upper shell 1 is equipped with oil inlet 5 and oil outlet 6, annular oil inlet cavity 7 is surrounded between coalescence filter core 4 and the inner wall of the shell, oil inlet cavity 7 is communicated with oil inlet 5 through oil inlet pipe 8;Electric pump 9 is arranged in upper shell 1,

[0040] Upper shell 1 is a cast aluminum part, and lower shell 2 is a plastic part;The central hole 10 of the coalescence filter core 4 is connected with the electric pump 9 and the diaphragm check valve through the oil outlet pipe 11, and the outlet of the diaphragm check valve and the outlet of the electric pump 9 are both communicated with the oil outlet 6;The diameters of the oil inlet pipe 8 and the oil outlet pipe 11 are both greater than or equal to 15 mm (preferably 15.82 mm, which is the specific diameter of the product designed by the company);The electric pump 9 is used for forced pumping of oil when the engine starts, so as to avoid poor fuel supply.

[0041] The utility model discloses through increasing the oil way diameter, simplifies the oil way structure (the existing product fuel oil flow path is circuitous), has reduced the oil resistance of fuel filter;The diaphragm check valve further reduces the oil resistance of fuel filter compared with the spring check valve used in the past. The reduction of oil resistance is conducive to reducing the fuel consumption of the motor vehicle using the fuel filter. At the same time, even without the electric pump 9, the problem of difficult engine starting caused by insufficient oil pumping can be alleviated after the oil resistance is reduced. Of course, the engine can also be prevented from stalling after the electric pump 9 is turned off.

[0042] The electric pump 9 in the utility model starts when the engine starts, and forces oil to the engine, so that the problems of poor fuel supply and difficult engine starting caused by low oil temperature and high viscosity can be eliminated, and the engine can also be started normally under extremely low temperature conditions.

[0043] The utility model discloses through setting the diaphragm check valve in the oil outlet oil way, after increasing the oil way diameter, the light weight and space utilization rate of the product are not sacrificed, so that the technical scheme of increasing the oil way diameter is realized.

[0044] Upper shell 1 is equipped with oil inlet 5 and oil outlet 6 connected to the outside, and is internally provided with structures such as a check valve and an electric pump 9, which require high structural strength. In the utility model, upper shell 1 is a cast aluminum part, and lower shell 2 is a plastic part, forming an aluminum-plastic composite shell structure that meets the needs of structural strength and the design goal of light weight.

[0045] The diaphragm check valve includes a valve seat 12, and a mesh oil passage 13 is arranged on the valve seat 12;An umbrella-shaped rubber diaphragm 15 is arranged on the valve seat 12 through a barb structure 14, and the setting direction of the umbrella-shaped rubber diaphragm 15 is towards the oil outlet 6;The valve seat 12 is sealingly connected with the hole wall of the oil outlet pipe 11 through a valve seat sealing ring 16.

[0046] The diaphragm check valve has simple structure, small volume and light weight. In the design of the diaphragm check valve, the oil pipe diameter can be increased while light weight and compactness are considered, and the core reason lies in the synergistic optimization of the structural characteristics, material selection and spatial layout of the diaphragm check valve.

[0047] The diaphragm check valve is composed of a plastic valve seat 12, a sealing ring and an umbrella-shaped rubber diaphragm 15, and does not need complex components such as a spring and a valve core, so that the axial space occupation is reduced by more than 60% (compared with a traditional spring check valve). In the radial layout, the umbrella-shaped rubber diaphragm 15 is fixed to the center hole 10 of the valve seat 12 through the barb structure 14, and is opened and closed only by relying on the elasticity of the diaphragm without the spring compression space; the fuel can be directly diffused through the diaphragm after passing through the mesh oil passage 13 without an additional flow guide cavity.

[0048] In comparison, the traditional spring check valve needs to reserve the spring compression stroke and the valve core activity space, so that the valve body volume is proportionally expanded when the oil way diameter is increased; the radial opening and closing characteristics of the diaphragm check valve decouple the volume and the oil way diameter, so that when the oil way diameter is increased from 9.89 mm to 15.82 mm, the valve body volume is only increased by about 20%, and the space is significantly saved.

[0049] When the electric pump 9 is powered on during the starting of the engine of the motor vehicle, the high pressure generated by the electric pump 9 acts on the oil way downstream of the diaphragm check valve, so that the diaphragm check valve is closed. The filtered clean oil is pumped from the electric pump 9 and flows to the oil outlet 6.

[0050] When the engine of the motor vehicle continuously works (engine oil suction), the filtered fuel pushes open the umbrella-shaped rubber diaphragm 15 through the mesh oil passage 13 to supply oil to the engine; after the engine stops working, the fuel presses the diaphragm tightly on the valve seat 12, so that the fuel cannot pass through, and the function of one-way passage is achieved, thereby avoiding the backflow of the fuel through the diaphragm check valve to the upstream oil way.

[0051] Compared with the fuel that needs to push open the spring and offset the friction force of the movable valve core sealing ring when the general spring check valve is used, the umbrella-shaped rubber check valve used in the oil way of the utility model can effectively reduce the resistance of the fuel passing through.

[0052] The coalescing filter element 4 comprises an upper end cover 17 and a lower end cover 18, and a cylindrical filter layer is connected between the upper end cover 17 and the lower end cover 18. The cylindrical filter layer comprises, in sequence from outside to inside in the radial direction, a filtering layer 19, a coalescing layer 20, a support framework 21 and a separation layer 22 made of a hydrophobic and oleophilic material; an annular cavity 23 is formed between the support framework 21 and the separation layer 22;

[0053] The lower end cover 18 is embedded with a lower sealing ring 24 on the radial outer wall, and a tight compression sealing cooperation is formed between the lower sealing ring 24 and the inner wall of the lower shell 2;

[0054] The center of the separation layer 22 is provided with the center hole 10, and the upper end cover 17 is provided with a sealing sleeve 25 communicated with the center hole 10, and the oil outlet pipe 11 is inserted into the sealing sleeve 25 and is in interference fit with the sealing sleeve 25. The coalescing filter element 4 is simple in structure and can effectively filter the fuel and remove the water in the fuel.

[0055] The coalescing filter element 4 and the lower shell 2 below the coalescing filter element 4 form a water accumulation cavity 30, and the water accumulation cavity 30 is provided with a water level sensor 31, a water level alarm 26, a heater 27, a drain valve interface 28 and a connector 29; the water level sensor 31, the water level alarm 26 and the heater 27 are connected with the connector 29, and the connector 29 is used for connecting the vehicle-mounted circuit; the heater 27 is higher than the alarm water level of the water level alarm 26. The drain valve interface 28 is used for connecting an electromagnetic drain valve before use.

[0056] The water level sensor 31 can monitor the water level of the accumulated water, and when the water level is too high, the water level alarm 26 is triggered to issue an alarm to remind the driver to drain water. The heater 27 is higher than the alarm water level of the water level alarm 26, which can avoid the heater 27 being immersed in water for a long time and shortening the service life.

[0057] In use, the electromagnetic drain valve is installed at the drain valve interface 28, the utility model is installed on the motor vehicle, and the connector 29 is connected to the vehicle-mounted circuit, so that the vehicle-mounted ECU can obtain relevant signals, and the water level sensor 31, the water level alarm 26 and the heater 27 are connected to the power supply.

[0058] When the engine is started, the vehicle-mounted ECU starts the electric pump 9 at the same time, the fuel in the fuel tank enters the annular oil inlet cavity 7 in the utility model through the oil way and the oil inlet 5, and the impurities and water in the fuel are filtered when the fuel passes through the coalescing filter element 4 in the radial direction. The filtered fuel is pressurized by the electric pump 9 and is supplied to the engine through the oil outlet 6, so that the problem of difficult engine starting is eliminated by forced fuel supply. After the engine is started, a negative pressure is formed in the oil way, the electric pump 9 is closed, and the filtered fuel passes through the mesh-shaped oil passage 13 to open the umbrella-shaped rubber diaphragm 15 under the action of the negative pressure, and is supplied to the engine through the oil outlet 6. After the oil way diameter is increased, the oil resistance is reduced, and the opening pressure of the diaphragm one-way valve is much smaller than that of the spring one-way valve, so that the oil resistance of the utility model is greatly reduced compared with the same products in the prior art, and the engine is prevented from stalling after the electric pump 9 is closed.

[0059] The above embodiments are only used to illustrate but not to limit the technical solutions of the utility model, although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that the utility model can still be modified or replaced equivalently without departing from the spirit and scope of the utility model, and any modification or partial replacement should be covered in the claim range of the utility model.

Claims

1. A low-resistance coalescence type light-weight fuel filter, comprising a shell, the shell comprising an upper shell and a lower shell, the upper shell being sealingly connected with the lower shell, a cavity being formed by the upper shell and the lower shell, and a coalescence filter element in the form of a cylinder being arranged in the cavity; the upper shell being provided with an oil inlet and an oil outlet, an annular oil inlet cavity being formed between the coalescence filter element and the inner wall of the shell, the oil inlet cavity being communicated with the oil inlet through an oil inlet pipe; an electric pump being arranged in the upper shell, characterized in that the upper shell being a cast aluminum part, the lower shell being a plastic part; the central hole of the coalescence filter element being connected with the electric pump and a diaphragm check valve through an oil outlet pipe, the outlet of the diaphragm check valve and the outlet of the electric pump being communicated with the oil outlet; the diameters of the oil inlet pipe and the oil outlet pipe being greater than or equal to 15 mm; the electric pump being used to avoid poor fuel supply when the engine is started.

2. The low-resistance coalescing type light-weight fuel filter according to claim 1, characterized by: The diaphragm check valve comprises a valve seat, the valve seat being provided with a reticular oil passage; the valve seat being provided with an umbrella-shaped rubber diaphragm through a barb structure, the setting direction of the umbrella-shaped rubber diaphragm being towards the oil outlet; the valve seat being sealingly fitted with the hole wall of the oil outlet pipe through a valve seat sealing ring.

3. The low-resistance coalescing type light-weight fuel filter according to claim 1, characterized by: The coalescence filter element comprises an upper end cover and a lower end cover, a cylindrical filter layer being connected between the upper end cover and the lower end cover, the cylindrical filter layer comprising, in sequence from outside to inside in the radial direction, a filter layer, a coalescence layer, a support framework and a separation layer made of a hydrophobic and oleophilic material; an annular cavity being formed between the support framework and the separation layer; the lower end cover being embedded with a lower sealing ring on the radial outer wall, the lower sealing ring being in tight sealing cooperation with the inner wall of the lower shell; the center of the separation layer being provided with the central hole, the upper end cover being provided with a sealing sleeve communicated with the central hole, the oil outlet pipe being downwardly inserted into the sealing sleeve and being in interference fit with the sealing sleeve.

4. The low resistance coalescing type light weight fuel filter according to claim 1, characterized in that: The coalescence filter element and the lower shell below the coalescence filter element form a water accumulation cavity, the water accumulation cavity being provided with a water level sensor, a water level alarm, a heater, a drain valve interface and a connector; the water level sensor, the water level alarm and the heater being connected with the connector, the connector being used to connect the vehicle-mounted circuit; the heater being higher than the alarm water level of the water level alarm.

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