Quick-response fuel oil return heating structure
By integrating an SMA spring into the fuel filter to adjust the fuel circuit path and create a fuel return heating structure, the problems of high energy consumption and slow response in existing technologies are solved, achieving low-energy-consumption and rapid heating, thus improving the reliability and power of the engine.
Patent Information
- Application Number
- CN202423109534.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-25
- Estimated Expiration
- 2034-12-17
AI Technical Summary
Existing fuel heating methods require an external power source, consume a lot of power, have a long heating time, have a slow response, and the thermostat is prone to damage, leading to damage to the fuel system.
It adopts a fast-response fuel return heating structure, which uses SMA springs to adjust the high-temperature fuel circuit path according to fuel temperature changes. It is integrated into the fuel filter and does not require an external power source. The fuel flow path is controlled by the extension and contraction of the SMA springs to achieve rapid and precise heating.
It achieves low-energy consumption and fast-response fuel heating, avoids damage to the fuel system, meets the heating requirements of the engine under different conditions, and improves the engine's reliability and power.
Smart Images
Figure CN223594314U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a technical field of automobile fuel, especially relates to a quick response fuel oil return heating structure. BACKGROUND
[0002] With the implementation of the national six and above emission standards, the engine and the whole vehicle manufacturer are more and more strict to the lightweight of the engine, the reduction of fuel consumption, the high reliability, the high integration module and the low cost. The engine needs lower fuel consumption, lighter weight, more reliable performance, high integration and lower cost. The common heating mode on the market is to arrange a heater with resistance wire inside at the bottom of the fuel filter, and generally integrate a thermostat inside. Or arrange a PTC ceramic sheet heater in the middle of the filter seat and filter core, and also integrate a thermostat inside.
[0003] However, the utility model person finds that the two heating modes have the following problems: first, they all need external power supply, large power consumption and long heating time; second, there is a time lag in heating opening and heating closing; finally, the thermostat is easy to be damaged, and once damaged, the heater will continue to heat, which may cause the engine to be unable to start due to empty battery, or even cause serious consequences.
[0004] Therefore, the present application provides a technical solution of low energy consumption and fast and accurate response to the fuel return system of the engine under different requirements to solve the problems of high energy consumption, response lag and damage to the fuel system in the prior art. SUMMARY
[0005] This part aims to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part and the abstract of the specification and the utility model name to avoid obscuring the purpose of this part, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.
[0006] In view of the above problems, the utility model is proposed.
[0007] The present application provides a technical solution of low energy consumption and fast and accurate response to the fuel return system of the engine under different requirements to solve the problems of high energy consumption, response lag and damage to the fuel system in the prior art.
[0008] To solve the above technical problems, the utility model solves the problems through the following technical solutions:
[0009] The utility model provides a kind of quick response fuel oil return heating structure, including filter seat and install in the connecting portion of filter seat and filter core cavity, fuel oil return heating assembly meets, fuel oil return heating assembly includes shell, the first interface of the shell one side is equipped with and the connecting portion of filter core cavity meets, first control valve assembly is equipped between the first interface and the connecting portion of filter core cavity, the second interface for high-pressure oil pipe fuel oil return and the third interface for output fuel to oil tank are provided in the shell other side, the second control valve assembly is also opened in the top of the shell, second control valve assembly includes second control valve and third control valve, second control valve is used to control connection second interface and third interface, third control valve is used to control connection second interface and first interface, first control valve assembly is used to control connection first interface and the connecting portion of filter core cavity, first control valve assembly includes valve seat, valve body, first elastic member between valve seat and valve body and second elastic member between valve body and the connecting portion of filter core cavity one side shell.
[0010] As a preferred scheme of the quick response fuel oil return heating structure, the valve seat includes a valve cover and an annular wall arranged perpendicularly to the valve cover, the valve body extends a valve post close to the valve seat, the valve post meets the valve cover, and the first elastic member is located between the annular wall and the valve post.
[0011] As a preferred scheme of the quick response fuel oil return heating structure, the valve body is sequentially provided with a first annular boss and a second annular boss away from the valve seat, the cross-sectional area of the first annular boss is greater than that of the second annular boss, and the second elastic member is located between the second annular boss and the first interface.
[0012] As a preferred scheme of the quick response fuel oil return heating structure, the shell is further provided with an abutting portion inside the first interface, which abuts against the second annular boss.
[0013] As a preferred scheme of the quick response fuel oil return heating structure, the top of the shell is provided with a cover plate for sealing the second control valve and the third control valve, the second control valve includes a flow-through cavity I and a spherical valve body I arranged in the flow-through cavity, the flow-through cavity I includes a first cavity and a second cavity, the diameter of the spherical valve body I is smaller than that of the first cavity and greater than that of the second cavity, the first cavity meets the third interface, and the second cavity meets the second interface.
[0014] As a preferred scheme of the quick response fuel oil return heating structure, the third control valve includes a flow-through cavity II and a spherical valve body II arranged in the flow-through cavity, the flow-through cavity II includes a third cavity and a fourth cavity, the diameter of the spherical valve body II is smaller than that of the third cavity and greater than that of the fourth cavity, and the fourth cavity is provided with a flow-through hole on the side wall, which meets the first interface.
[0015] As a preferred scheme of the quick-response fuel return oil heating structure, the first elastic member is an SMA spring, and the SMA spring is elongated when the temperature is higher than 20 DEG C.
[0016] As a preferred scheme of the quick-response fuel return oil heating structure, the SMA spring is retracted when the temperature is lower than 7 DEG C.
[0017] As a preferred scheme of the quick-response fuel return oil heating structure, the shell is connected to the filter seat through a fixing bolt.
[0018] The quick-response fuel return oil heating structure provided by the application does not need an additional external power supply, and compared with the external power supply mode, the SMA spring of the application can more accurately adjust the high-temperature fuel return circuit path according to the ambient fuel temperature, remove the problem of response lag, and thus eliminate the problem that the engine cannot be started or the fuel system is damaged. In addition, the shell of the fuel return oil heating assembly in the application can be a plastic piece integrated on the fuel filter, meeting the requirements of high integration and light weight. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical scheme of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor. Among them:
[0020] Figure 1 The structure schematic view of the quick-response fuel return oil heating structure according to the embodiment of the application;
[0021] Figure 2 The structure schematic view of the fuel return oil heating assembly according to the embodiment of the application;
[0022] Figure 3 The structure schematic view of the cross-sectional view according to the embodiment of the application Figure 2 The structure schematic view of the cross-sectional view according to the embodiment of the application
[0023] Figure 4 The temperature-elongation rate schematic view of the first elastic member according to the embodiment of the application.
[0024] The names of the parts referred to by the numbers in the drawings are as follows:
[0025] 100 - Fast-response fuel return heating structure; 1 - Filter seat; 11 - Filter element cavity connection; 2 - Fuel return heating assembly 2; 21 - Housing; 212 - First interface; 2121 - Top; 213 - Second interface; 214 - Third interface; 215 - Cover plate; 3 - First control valve assembly; 31 - Valve seat; 311 - Valve cover; 312 - Annular wall; 32 - Valve body; 321 - Valve column; 322 - First annular boss; 323 - Second annular boss; 33 - First elastic element; 34 - Second elastic element; 35 - Bolt; 36 - Metal insert; 4 - Second control valve assembly; 41 - Second control valve; 411 - Flow cavity one; 4111 - First cavity; 4112 - Second cavity; 412 - Spherical valve body one; 42-Third control valve; 421-Flow chamber two; 4211-Third chamber; 4212-Fourth chamber; 42121-Flow hole; 422-Spherical valve body two. Detailed Implementation
[0026] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.
[0027] like Figures 1 to 2 As shown, this utility model provides a fast-response fuel return heating structure 100, including a filter seat 1 and a fuel return heating assembly 2 installed at the connection part 11 between the filter seat 1 and the filter element cavity. The fuel return heating assembly 2 includes a housing 21. One side of the housing 21 is provided with a first interface 212 that connects to the connection part 11 of the filter element cavity. A first control valve assembly 3 is provided between the first interface 212 and the connection part 11 of the filter element cavity. The other side of the housing 21 is provided with a second interface 213 for high-pressure fuel return and a third interface 214 for outputting fuel to the fuel tank. The top of the housing 21 also has a third interface 214. The second control valve assembly 41 includes a second control valve 41 and a third control valve 42. The second control valve 41 is used to control the connection between the second interface 213 and the third interface 214, and the third control valve 42 is used to control the connection between the second interface 213 and the first interface 212. The first control valve assembly 3 is used to control the connection between the first interface 212 and the filter element cavity 11. The first control valve assembly 3 includes a valve seat 31, a valve body 32, a first elastic element 33 disposed between the valve seat 31 and the valve body 32, and a second elastic element 34 disposed between the valve body 32 and the connection part 11 of the filter element cavity on one side of the housing 21.
[0028] Specifically, the fuel return heating assembly 2 is integrated on the filter holder 1 body. The shell 21 of the fuel return heating assembly 2 comprises a first interface 212, a second interface 213 and a third interface 214, the first interface 212 is connected with the connecting part 11 of the filter element cavity of the filter holder 1 and is controlled by the first control valve assembly 3 whether to communicate or not. The second interface 213 and the third interface 214 are respectively used for the return of the high-pressure oil pipe fuel and the return of the returned fuel to the oil tank. The top of the shell 21 is also provided with a second control valve 41 assembly 4, comprising a second control valve 41 and a third control valve 42, the second control valve 41 is used for controlling the connection between the second interface 213 and the third interface 214, and the third control valve 42 is used for controlling the connection between the second interface 213 and the first interface 212.
[0029] As can be seen, there are two routes for fuel return, one is to realize the flow of high-pressure oil pipe fuel from the second interface 213 to the third interface 214 to the oil tank through the opening of the second control valve 41, and the other is to realize the flow of high-pressure oil pipe fuel from the second interface 213 to the first interface 212 to the connecting part 11 of the filter element cavity through the opening of the third control valve 42 and the first control valve assembly 3.
[0030] Further, the first control valve assembly 3 comprises a valve seat 31, a valve body 32, a first elastic member 33 arranged between the valve seat 31 and the valve body 32, and a second elastic member 34 arranged between the valve body 32 and the connecting part 11 of the filter element cavity on one side of the shell 21.
[0031] Specifically, the first control valve assembly 3 realizes the opening or closing of the first interface 212 and the connecting part 11 of the filter element cavity through the action between the first elastic member 33 and the second elastic member 34. It should be pointed out that the first elastic member 33 in the present application is an SMA spring, and the second elastic member 34 is a common spring. The SMA spring is made of one of the three alloys of nickel-titanium-based shape memory alloy, copper-based shape memory alloy and iron-based shape memory alloy, and the SMA spring in the present application is preferably a nickel-titanium-based shape memory alloy. As shown in the figure, the SMA spring is affected by temperature and can quickly change the length of the spring itself according to different ambient temperature. As can be seen, the SMA spring will elongate when the temperature is lower than 7℃ and will elongate when the temperature is greater than 20℃. Obviously, the common spring elongates when the temperature is low and shortens when the temperature is high. Figure 3
[0032] Further, the valve seat 31 comprises a valve cover 311 and an annular wall 312 arranged vertically with the valve cover 311, the valve body 32 extends with a valve column 321 close to one side of the valve seat 31, the valve column 321 is connected with the valve cover 311, and the first elastic member 33 is located between the annular wall 312 and the valve column 321. The valve body 32 is sequentially provided with a first annular boss 322 and a second annular boss 323 away from the valve seat 31, the cross-sectional area of the first annular boss 322 is larger than that of the second annular boss 323, and the second elastic member 34 is located between the second annular boss 323 and the first interface 212.
[0033] Specifically, the SMA spring is located between the annular wall 312 of the valve seat 31 and the valve column 321 of the valve body 32, one end of the ordinary spring is in contact with the first annular boss 322, is sleeved on the second annular boss 323, and the other end is connected with the first interface 212.
[0034] Further, the first interface 212 inside the shell 21 is further provided with an abutting portion 2121 abutting against the second annular boss 323.
[0035] Specifically, the first interface 212 is provided with an abutting portion 2121 connected with the second annular boss 323, and it can be understood that the ordinary spring is sleeved on the abutting portion 2121 and the second annular boss 323 and located in the first interface 212.
[0036] It can be imagined that when the SMA spring is elongated, the ordinary spring is compressed under the influence of force, and the second annular boss 323 of the valve body 32 abuts against the abutting portion 2121 of the first interface 212. When the SMA spring is shortened, the ordinary spring is elongated, and the second annular boss 323 of the valve body 32 does not abut against the abutting portion 2121 of the first interface 212.
[0037] It can be seen that the SMA spring is elongated or shortened under the influence of temperature, thereby changing the shortening or elongation of the ordinary spring, thereby making the second annular boss 323 of the valve body 32 abut against or not abut against the abutting portion 2121 in the first shell 21, and finally realizing the communication or non-communication of the first interface 212 and the connecting part 11 of the filter element cavity.
[0038] Further, the top of the shell 21 is provided with a cover plate 215 for sealing the second control valve 41 and the third control valve 42, the second control valve 41 comprises a flow passage cavity one 411 and a spherical valve body one 412 arranged in the flow passage cavity, the flow passage cavity one 411 comprises a first cavity 4111 and a second cavity 4112, the diameter of the spherical valve body one 412 is smaller than that of the first cavity 4111 and larger than that of the second cavity 4112, the first cavity 4111 is connected with the third interface 214, and the second cavity 4112 is connected with the second interface 213.
[0039] The third control valve 42 comprises a flow cavity two 421 and a spherical valve body two arranged in the flow cavity, the flow cavity two 421 comprises a third cavity 4211 and a fourth cavity 4212, the diameter of the spherical valve body two is smaller than the diameter of the third cavity 4211 and larger than the diameter of the fourth cavity 4212, and a flow hole 42121 is arranged in the side wall of the fourth cavity 4212 and connected with the first interface 212.
[0040] Specifically, the spherical valve body one 412 and the spherical valve body two are clamped in the second cavity 4112 and the third cavity 4211 respectively under the action of gravity, and the spherical valve body one 412 and the spherical valve body two can be plastic balls or hollow metal balls. The spherical valve body one 412 and the spherical valve body two are lifted under the influence of different pressures, so as to realize the communication between the second interface 213 and the third interface 214 or the communication between the second interface 213 and the first interface 212.
[0041] It should be pointed out that the cover plate 215 simultaneously seals the second control valve 41 and the third control valve 42, and the cover plate 215 and the shell 21 can be sealed by welding connection or by a sealing ring, so as to meet the requirement of air tightness.
[0042] In addition, the position of the side wall of the fourth cavity 4212 clamped with the side wall of the spherical valve body two is lower than the position of the flow hole 42121.
[0043] Further, the shell 21 is also connected to the filter seat 1 through the fixing bolt 35. It can be understood that the stability of the fuel oil return heating assembly 2 is ensured. In addition, the shell 21 in the present application can also be made of a plastic part, and when the shell 21 is made of a plastic part, a metal insert 36 is arranged at the connecting position between the shell 21 and the filter seat 1 in addition to the connection through the bolt 35.
[0044] Further, the shell 21 is also connected to the filter seat 1 through the fixing bolt 35. It can be understood that the stability of the fuel oil return heating assembly 2 is ensured. In addition, the shell 21 in the present application can also be made of a plastic part, and when the shell 21 is made of a plastic part, a metal insert 36 is arranged at the connecting position between the shell 21 and the filter seat 1 in addition to the connection through the bolt 35.
[0045] In an actual application scenario provided in the present application, if the ambient temperature is high, such as in summer or after the engine has been operated for a period of time, the temperature of the fuel tank and the entire fuel pipeline is high, which is greater than the temperature at which the SMA spring can be deformed and elongated, for example, Figure 4As shown, the SMA spring is extended, while the ordinary spring is compressed. The second annular boss 323 of the valve body 32 abuts against the top 2121 inside the first interface 212. No air pressure is generated inside the first interface 212, and there is no air flow through the flow hole 42121 between the fourth cavity 4212 and the first interface 212. The spherical valve body 2 is locked into the fourth cavity 4212 by gravity. Fuel from the high-pressure oil pipe flows into the second interface 213. When it passes through the second control valve 41, it pushes the spherical valve body 1 412 to the first cavity 4111, and then flows back to the fuel tank through the third interface 214.
[0046] like Figure 4 As shown, if the ambient temperature is low, such as in winter or when the engine has just started running, the temperature of the fuel tank and the entire fuel line is low, below the temperature at which the SMA spring deforms and shortens. When this temperature is low, the SMA spring retracts, the ordinary spring is stretched, the second annular boss 323 of the valve body 32 and the top 2121 in the first interface 212 do not abut against each other, the first interface 212 is connected to the connection part 11 of the filter element cavity, the flow hole 42121 between the fourth cavity 4212 and the first interface 212 allows air to flow and is under negative pressure. The second ball valve body is sucked into the third cavity 4211 due to the negative pressure. Similarly, the first ball valve body 412 of the second control valve 41 is stuck in the second cavity 4112 due to gravity and negative pressure. The fuel returning from the high-pressure oil pipe flows into the second interface 213, through the third control valve 42 and the flow hole 42121 to the first interface 212, and then through the first interface 212 to the filter element cavity. The low-temperature fuel in the fuel tank is mixed and heated inside the filter chamber by high-temperature fuel from the high-pressure fuel line, and then filtered before entering the fuel pump.
[0047] This can also be understood as follows: When the ambient temperature around the SMA spring is low, the SMA spring shortens, allowing hot fuel to pass through the SMA spring and enter the fuel filter element chamber. There, it mixes with the cold fuel from the fuel tank, quickly raising the temperature of the fuel inside the fuel filter and improving fuel flow. It also provides sufficient fuel pressure to the fuel pump intake side, supplying the common rail system with hot and stable-pressure fuel, ensuring engine power and fuel economy, and meeting stricter emission regulations. When the ambient temperature around the SMA spring is high, the SMA spring extends. In this case, the fuel supply to the fuel pump intake side is smooth, and hot fuel does not need to enter the fuel filter; the hot fuel returns directly to the fuel tank.
[0048] It can be seen that the utility model discloses on the basis of not needing external power supply, through SMA spring sensing ambient fuel temperature, can more fast and accurate regulation high temperature fuel oil return path, remove the problem of response lag. Meanwhile through the technical scheme of the application, the problem of power deficiency when starting at low temperature and just starting to operate can be solved. For example, at low temperature, fuel will wax, viscosity becomes high, fluidity becomes poor, the whole fuel system resistance is very high, and engine cannot be provided with enough fuel for combustion;After engine ignition, due to the very poor fluidity of fuel, air precipitation will be aggravated simultaneously, engine fuel supply is insufficient and a large amount of air is mixed in fuel, which will cause engine to shake, power deficiency, even stall;Due to insufficient fuel supply, the emission requirement of engine will be affected, and at low temperature environment, the emission regulation requirement cannot be met.
[0049] It should be noted that the above examples are only used to illustrate the technical solutions of the utility model and are not limiting. Although the utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.
Claims
1. A quick response fuel oil return heating structure, characterized by, The application relates to a fuel return heating assembly comprising a filter seat and a fuel return heating assembly installed at the connecting part of the filter seat and the filter core cavity, wherein the fuel return heating assembly comprises a shell, one side of the shell is provided with a first interface connected with the connecting part of the filter core cavity, a first control valve assembly is arranged between the first interface and the connecting part of the filter core cavity, the other side of the shell is provided with a second interface for high-pressure oil pipe fuel return and a third interface for outputting fuel to an oil tank, a second control valve assembly is further arranged at the top of the shell, the second control valve assembly comprises a second control valve and a third control valve, the second control valve is used for controlling connection between the second interface and the third interface, the third control valve is used for controlling connection between the second interface and the first interface, the first control valve assembly is used for controlling connection between the first interface and the connecting part of the filter core cavity, and the first control valve assembly comprises a valve seat, a valve body, a first elastic piece arranged between the valve seat and the valve body and a second elastic piece arranged between the valve body and the connecting part of the filter core cavity on one side of the shell.
2. The quick response fuel return heating structure according to claim 1, wherein The valve seat comprises a valve cover and an annular wall arranged vertically with the valve cover, the valve body is extended with a valve column on the side close to the valve seat, the valve column is connected with the valve cover, and the first elastic piece is located between the annular wall and the valve column.
3. The quick response fuel return heating structure according to claim 1, wherein The valve body is sequentially provided with a first annular boss and a second annular boss on the side away from the valve seat, the sectional area of the first annular boss is larger than that of the second annular boss, and the second elastic piece is located between the second annular boss and the first interface.
4. The quick response fuel oil return heating structure according to claim 3, wherein The inside of the first interface of the shell is further provided with an abutting part abutting against the second annular boss.
5. The quick response fuel return heating structure according to claim 1, wherein The top of the shell is provided with a cover plate used for sealing the second control valve and the third control valve, the second control valve comprises a flow-through cavity I and a spherical valve body I arranged in the flow-through cavity, the flow-through cavity I comprises a first cavity and a second cavity, the diameter of the spherical valve body I is smaller than that of the first cavity and larger than that of the second cavity, the first cavity is connected with the third interface, and the second cavity is connected with the second interface.
6. The quick response fuel return heating structure according to claim 5, wherein The third control valve comprises a flow-through cavity II and a spherical valve body II arranged in the flow-through cavity, the flow-through cavity II comprises a third cavity and a fourth cavity, the diameter of the spherical valve body II is smaller than that of the third cavity and larger than that of the fourth cavity, and a flow-through hole is arranged in the side wall of the fourth cavity and connected with the first interface.
7. The quick response fuel oil return heating structure according to claim 1, wherein The first elastic piece is an SMA spring, and the SMA spring is elongated when the temperature is higher than 20 DEG C.
8. The quick response fuel oil return heating structure according to claim 7, wherein The SMA spring is retracted when the temperature is lower than 7 DEG C.
9. The quick response fuel oil return heating structure according to claim 1, wherein The shell is further connected with the filter seat through fixing bolts.