Two-stage filtration diesel oil supply mechanism and diesel oil fine filter
By installing heaters in the negative and positive pressure sections of the diesel supply mechanism, the problem of increased flow resistance caused by the increase in viscosity of diesel in low temperature environments is solved, ensuring smooth start of the diesel engine under severe cold conditions and extending the filter life.
Patent Information
- Application Number
- CN202422662383.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-11-01
AI Technical Summary
In low temperature environments, increasing diesel viscosity leads to difficulty in starting the diesel engine. In the prior art, only installing a heater in the negative pressure section cannot effectively solve the problem of excessive flow resistance of the fine filter filter caused by the decrease in temperature during the flow process of diesel.
The first and second stage heaters are installed in the negative and positive pressure sections of the diesel supply mechanism, respectively, and are located in the coarse filter and fine filter filter respectively to ensure that the diesel maintains appropriate temperature and low viscosity throughout the supply process.
It effectively avoids the problem of increased flow resistance caused by the temperature reduction of diesel during flow, ensures that diesel passes smoothly under severe cold conditions, extends the service life of the fine filter filter and improves the filtration effect.
Smart Images
Figure CN223282160U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a diesel engine fuel supply technology, in particular to a two-stage filtering fuel supply technology. Background Art
[0002] The fuel supply mechanism of the diesel engine includes a fuel tank, which is connected to the inlet of the coarse diesel filter through a pipeline, the outlet of the coarse diesel filter is connected to the inlet of the oil pump through a pipeline, the outlet of the oil pump is connected to the inlet of the fine diesel filter through a pipeline, the outlet of the fine diesel filter is connected to the inlet of the high-pressure oil pump through a pipeline, and the outlet of the high-pressure oil pump is connected to the diesel engine through a pipeline.
[0003] During the cold winter months, diesel viscosity increases, increasing resistance to the filter and potentially causing engine starting difficulties. Existing technologies address this issue by adding a fuel heater to heat the diesel. These heaters are typically located in the fuel tank, within the coarse filter, or, in some cases, at the primary pump (fuel transfer pump). These heaters all share the characteristic of primary heating, located in the negative pressure section.
[0004] A heater is provided in the negative pressure section, which can heat the diesel in the upstream part of the fuel supply mechanism; among them, the solution of providing a heater in the coarse filter housing is the mainstream solution, which can directly reduce the flow resistance of diesel when passing through the coarse filter element.
[0005] The aforementioned solution of installing a first-stage heater in the negative pressure section can meet the diesel heating needs of winter in warmer climates. In cold climates, winter temperatures often drop below -20°C or even -30°C. If the diesel is not heated at the coarse filter, the flow resistance at the coarse filter will be too high when the vehicle is started, making it difficult to start the engine. Therefore, a heater is required at the coarse filter. However, due to the very low ambient temperature, the diesel temperature drops significantly as it flows through the pipeline between the coarse filter, the fuel pump, and the fine filter. When it reaches the fine filter, the diesel will have difficulty passing through the fine filter due to the low temperature and increased viscosity, which can also make it difficult to start the engine. Utility Model Content
[0006] The purpose of the utility model is to provide a two-stage filtering diesel supply mechanism, in which heaters are installed at both the coarse filter and the fine filter to avoid excessive flow resistance at the fine filter due to the decrease in diesel temperature during flow.
[0007] To achieve the above-mentioned object, the two-stage filtering diesel supply mechanism of the present invention includes a fuel tank, the fuel tank is connected to the inlet of a coarse filter through a pipeline, the outlet of the coarse filter is connected to the inlet of a fuel pump through a pipeline, the outlet of the fuel pump is connected to the inlet of a fine filter through a pipeline, the outlet of the fine filter is connected to the inlet of a high-pressure fuel pump through a pipeline, and the outlet of the high-pressure fuel pump is used to be connected to the diesel engine through a pipeline; the upstream direction of the fuel pump is a negative pressure section, and the downstream direction of the fuel pump is a positive pressure section;
[0008] The negative pressure section and the positive pressure section are respectively provided with heaters.
[0009] A primary heater is provided in the housing of the coarse filter diesel oil filter, and a secondary heater is provided in the housing of the fine filter diesel oil filter.
[0010] The heater of the negative pressure section is a primary heater, which is installed in the housing of the coarse filter diesel oil filter; the heater of the positive pressure section is a secondary heater, which is installed in the housing of the fine filter diesel oil filter.
[0011] It includes a cylindrical shell, a maintenance end cover is threadedly connected to the top of the cylindrical shell, a base is integrally provided at the bottom of the cylindrical shell, an oil outlet pipe is connected to the base; and an oil inlet pipe is connected to the side wall of the cylindrical shell;
[0012] A cylindrical filter element is disposed within the cylindrical housing, comprising an upper end cap, a lower end cap, and a fine filter layer connected between the upper and lower end caps. The fine filter layer is cylindrical and has a central frame connected to its inner wall. The central frame forms a central hole, which communicates with the oil outlet pipe. The fine filter layer is coaxially disposed with the cylindrical housing. An annular oil inlet cavity is formed between the circumferential outer surface of the fine filter layer and the cylindrical housing, and the oil inlet cavity communicates with the oil inlet pipe.
[0013] A lower cavity is formed between the lower end cover and the base, and the lower cavity is communicated with the oil inlet cavity; the secondary heater is provided in the lower cavity, and the secondary heater adopts a disc heater. The secondary heater has a connecting part, and a connecting hole matching the connecting part is provided on the base. The connecting part passes through the connecting hole and extends downward from the base, and two sealing rings are provided between the connecting part and the hole wall of the connecting hole.
[0014] The utility model has the following advantages:
[0015] The utility model installs two-stage heaters at the negative pressure section and the positive pressure section, thereby avoiding the phenomenon that the diesel temperature in the negative pressure section is appropriate while the diesel temperature in the positive pressure section is low, ensuring that the diesel has an appropriate temperature and a low viscosity in the entire section of the supply mechanism under severe cold weather conditions, thereby ensuring the oil supply demand of the engine under severe cold weather conditions.
[0016] The filter element of the diesel filter is the location where the flow resistance of the diesel supply mechanism is the largest. The first-stage heater and the second-stage heater are respectively arranged in the coarse filter and the fine filter, which can best ensure the oil temperature at the location with the largest flow resistance and eliminate the bottleneck of diesel flow in the diesel supply mechanism.
[0017] The fine filter diesel filter has a simple structure and is easy to install a disc heater, which can effectively heat the diesel on the dirty oil side of the cylindrical filter element to avoid excessive viscosity of the diesel in the positive pressure section due to low oil temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a structural diagram of a two-stage filtered diesel supply mechanism.
[0019] Figure 2 It is a structural diagram of a fine diesel filter.
[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of a fine diesel filter. DETAILED DESCRIPTION
[0021] like Figures 1 to 3 As shown, the two-stage filtering diesel supply mechanism of the present invention includes a fuel tank 1, the fuel tank 1 is connected to the inlet of the coarse filter diesel filter 2 through a pipeline, the outlet of the coarse filter diesel filter 2 is connected to the inlet of the oil pump 3 through a pipeline, the outlet of the oil pump 3 is connected to the inlet of the fine filter diesel filter 4 through a pipeline, the outlet of the fine filter diesel filter 4 is connected to the inlet of the high-pressure oil pump 5 through a pipeline, and the outlet of the high-pressure oil pump 5 is used to be connected to the diesel engine 6 through a pipeline; the upstream direction of the oil pump 3 to the fuel tank 1 is a negative pressure section, and the downstream direction of the oil pump 3 to the diesel engine 6 is a positive pressure section; the setting of the two-stage filter can reduce the load of the fine filtration, extend the service life of the fine filter diesel filter 4, and improve the filtering effect.
[0022] Heaters are installed in both the negative and positive pressure sections. A primary heater is installed in the housing of the coarse diesel filter 2, and a secondary heater 7 is installed in the housing of the fine diesel filter 4. Installing a heater in the coarse diesel filter 2 is conventional technology; the primary heater is not shown.
[0023] The utility model installs two-stage heaters at the negative pressure section and the positive pressure section, thereby avoiding the phenomenon that the diesel temperature in the negative pressure section is appropriate while the diesel temperature in the positive pressure section is low, ensuring that the diesel has an appropriate temperature and a low viscosity in the entire section of the supply mechanism under severe cold weather conditions, thereby ensuring the oil supply demand of the engine under severe cold weather conditions.
[0024] The heater of the negative pressure section is a primary heater, which is installed in the housing of the coarse filter 2 ; the heater of the positive pressure section is a secondary heater 7 , which is installed in the housing of the fine filter 4 .
[0025] The filter element of the diesel filter is the location where the flow resistance of the diesel supply mechanism is the largest. The first-level heater and the second-level heater 7 are respectively arranged in the coarse filter diesel filter 2 and the fine filter diesel filter 4, which can best ensure the oil temperature at the location with the largest flow resistance and eliminate the bottleneck of diesel flow in the diesel supply mechanism.
[0026] The present invention also discloses a fine filter diesel filter 4 used in the above-mentioned two-stage filtering diesel supply mechanism, such as Figures 2 to 3 As shown, the fine filter diesel filter 4 includes a cylindrical shell 8, a maintenance end cover 9 is threadedly connected to the top of the cylindrical shell 8, a base 10 is integrally provided at the bottom of the cylindrical shell 8, and an oil outlet pipe 11 is connected to the base 10; an oil inlet pipe 12 is connected to the side wall of the cylindrical shell 8;
[0027] A cylindrical filter element is housed within the cylindrical housing 8. This element comprises an upper end cap 13, a lower end cap 14, and a fine filter layer 15 connected between the upper and lower end caps 13, 14. The upper end cap 13 is connected to a maintenance end cap, while the lower end cap 14 is positioned above the base 10. Fine filter layer 15 is cylindrical in shape, and its inner wall is connected to a central framework 16, which defines a central aperture that communicates with the oil outlet pipe 11. Fine filter layer 15 is coaxially arranged with the cylindrical housing 8, and an annular oil inlet chamber 17 is formed between the circumferential outer surface of fine filter layer 15 and the cylindrical housing 8. This inlet chamber 17 communicates with the oil inlet pipe 12.
[0028] A lower cavity 18 is formed between the lower end cap 14 and the base 10, communicating with the oil inlet chamber 17. The secondary heater 7, a disc-type heater, is housed within the lower cavity 18. The secondary heater 7 has a connecting portion, which is matched with a connecting hole provided on the base 10. The connecting portion passes through the connecting hole and extends downward from the base 10. Two sealing rings 19 are provided between the connecting portion and the wall of the connecting hole. To avoid clutter in the drawing, the secondary heater 7, lower cavity 18, and sealing ring 19 are indicated in the figure, and the connecting hole is not given a separate reference numeral.
[0029] The fine filter diesel filter 4 has a simple structure and is easy to install a disc heater, which can effectively heat the diesel on the dirty oil side of the cylindrical filter element to avoid excessive viscosity of the diesel in the positive pressure section due to low oil temperature.
[0030] The present invention is installed on a motor vehicle using diesel as fuel, located between the fuel tank 1 and the engine. In severe cold weather, diesel becomes more viscous due to its low temperature. Low-temperature diesel passes through a negative pressure section and a positive pressure section in the supply mechanism before ultimately reaching the engine. The two-stage filtration diesel supply mechanism of the present invention has two bottlenecks with high pressure drop (high flow resistance): a coarse diesel filter 2 in the negative pressure section, and a fine diesel filter 4 in the positive pressure section. Heaters are installed in both bottlenecks. This ensures the oil temperature at the bottlenecks, thereby reducing the pressure drop and ensuring smooth passage of diesel through them. Furthermore, the installation of heaters in both the negative and positive pressure sections prevents diesel heated by the negative pressure heater in severe cold weather from returning to low-temperature diesel and increasing its viscosity after flowing through the pipeline to the positive pressure section. This ensures that the diesel maintains a low viscosity throughout the entire diesel supply mechanism, ensuring smooth passage.
[0031] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.
Claims
1. A two-stage filtered diesel supply mechanism includes a fuel tank connected to the inlet of a coarse diesel filter via a pipeline. The outlet of the coarse diesel filter is connected to the inlet of a fuel pump via a pipeline. The outlet of the fuel pump is connected to the inlet of a fine diesel filter via a pipeline. The outlet of the fine diesel filter is connected to the inlet of a high-pressure fuel pump via a pipeline. The outlet of the high-pressure fuel pump is connected to the diesel engine via a pipeline. The upstream direction of the fuel pump is a negative pressure section, and the downstream direction of the fuel pump is a positive pressure section. Its characteristics are: The negative pressure section and the positive pressure section are respectively provided with heaters; A primary heater is provided in the housing of the coarse filter diesel oil filter, and a secondary heater is provided in the housing of the fine filter diesel oil filter.
2. The two-stage filtered diesel supply mechanism according to claim 1, characterized in that: The heater of the negative pressure section is a primary heater, which is installed in the housing of the coarse filter diesel oil filter; the heater of the positive pressure section is a secondary heater, which is installed in the housing of the fine filter diesel oil filter.
3. The diesel fine filter used in the two-stage filtration diesel supply mechanism of claim 2, characterized in that: It includes a cylindrical shell, a maintenance end cover is threadedly connected to the top of the cylindrical shell, a base is integrally provided at the bottom of the cylindrical shell, an oil outlet pipe is connected to the base; and an oil inlet pipe is connected to the side wall of the cylindrical shell; A cylindrical filter element is disposed within the cylindrical housing, comprising an upper end cap, a lower end cap, and a fine filter layer connected between the upper and lower end caps. The fine filter layer is cylindrical and has a central frame connected to its inner wall. The central frame forms a central hole, which communicates with the oil outlet pipe. The fine filter layer is coaxially disposed with the cylindrical housing. An annular oil inlet cavity is formed between the circumferential outer surface of the fine filter layer and the cylindrical housing, and the oil inlet cavity communicates with the oil inlet pipe. A lower cavity is formed between the lower end cover and the base, and the lower cavity is communicated with the oil inlet cavity; the secondary heater is provided in the lower cavity, and the secondary heater adopts a disc heater. The secondary heater has a connecting part, and a connecting hole matching the connecting part is provided on the base. The connecting part passes through the connecting hole and extends downward from the base, and two sealing rings are provided between the connecting part and the hole wall of the connecting hole.