A low fuel vapor system with unobstructed fuel passage

Abstract

The utility model provides a kind of low fuel evaporation system of oil passage unobstructed, it is related to engine fuel field, including oil tank, carbon canister, carburetor and oil switch, wherein, the oil outlet of oil tank is connected to the oil inlet of carburetor by oil switch, its gas outlet is connected to the adsorption port of carbon canister using adsorption pipeline, two-way valve is set on adsorption pipeline;The desorption port of carbon canister is connected to the desorption port of carburetor using desorption pipeline, one PCV valve is set on desorption pipeline, the negative pressure port of PCV valve is connected to the negative pressure port of carburetor, and the atmosphere balance hole of carburetor is connected with atmosphere balance hole solenoid valve;Scheme by setting first check valve, which is connected to gas outlet and atmosphere balance hole solenoid valve, second check valve, which is connected to oil tank and atmosphere, or setting second PCV valve, which is connected to negative pressure port of carburetor between air inlet and carbon canister, maintain pressure balance of oil tank when fuel engine works, and engine oil passage unobstructed can work continuously.

Description

Technical Field

[0001] This utility model relates to the field of engine fuel technology, specifically to a low fuel evaporation system with smooth fuel flow. Background Technology

[0002] The working principle of an internal combustion engine is to convert the heat generated by burning fuel into mechanical energy for user consumption. With the increasing societal need for green development, internal combustion engines require technological improvements to meet environmental protection requirements. Currently, the environmental impact of internal combustion engines is mainly twofold: firstly, the combustion exhaust gases produced by fuel combustion; and secondly, the evaporation of fuel, producing evaporative emissions. Both combustion exhaust gases and evaporative emissions contribute significantly to air pollution. Regarding combustion exhaust gases, existing technologies address this issue by improving fuel combustion efficiency or using clean energy sources. As for evaporative emissions, in addition to environmental requirements, new regulations on fuel evaporation stipulate that the daily evaporation of fuel in engines with a displacement of 80-225cc cannot exceed 0.6g. Currently, researchers are reducing fuel evaporation by improving carburetor structure and optimizing the fuel evaporation system, as illustrated by the solution disclosed in patent CN221144617U.

[0003] However, with the use of the existing low fuel evaporation system, users have found that when the ambient temperature drops, the fuel line of the fuel engine will experience fuel leakage failure, causing the fuel engine to malfunction. Utility Model Content

[0004] The purpose of this invention is to provide a low fuel evaporation system with smooth oil passages. This evaporation system can ensure low fuel evaporation while maintaining smooth oil passages in various temperature environments, enabling the unit to operate normally and reducing downtime.

[0005] To achieve the above objectives, the present invention proposes the following technical solution:

[0006] Firstly, a low fuel evaporation system with smooth fuel flow is proposed, including a fuel tank, carbon canister, carburetor, and fuel switch;

[0007] The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is installed on the fuel pipeline; the outlet of the fuel tank's breather is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, with the negative pressure port of the PCV valve connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve, and a first one-way valve is installed between the outlet of the fuel tank's breather and the atmospheric balance orifice solenoid valve;

[0008] When the fuel engine starts, the atmospheric balance orifice solenoid valve opens. When the fuel tank generates negative pressure, the first one-way valve unidirectionally guides the fuel to the outlet to keep the fuel circuit unobstructed.

[0009] Furthermore, one end of the first one-way valve is connected to the adsorption pipeline and is located between the two-way valve and the air outlet, while the other end is connected to the atmospheric balance hole solenoid valve.

[0010] Secondly, a low fuel evaporation system with smooth fuel flow is proposed, including a fuel tank, carbon canister, carburetor and fuel switch;

[0011] The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is located on the fuel pipeline; the outlet of the fuel tank's upper breather is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, with the negative pressure port of the PCV valve connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve; a second PCV valve is connected between the outlet of the fuel tank's upper breather and the adsorption port of the carbon canister, with the negative pressure port of the second PCV valve connected to the negative pressure port of the PCV valve;

[0012] When the combustion engine starts, the engine generates negative pressure, the second PCV valve opens, and flows to the outlet to keep the fuel line unobstructed.

[0013] Furthermore, the second PCV valve is connected in parallel with the bidirectional valve on the adsorption pipeline.

[0014] Thirdly, a low fuel evaporation system with smooth fuel flow is proposed, including a fuel tank, carbon canister, carburetor and fuel switch;

[0015] The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is located on the fuel pipeline; the exhaust port of the breather device on the fuel tank is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, and the negative pressure port of the PCV valve is connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve;

[0016] A second one-way valve is installed on the top of the oil tank. When the oil tank generates negative pressure, the second one-way valve opens to the inside of the oil tank in one direction to keep the oil passage unobstructed.

[0017] As can be seen from the above technical solutions, the technical solutions of this utility model have achieved the following beneficial effects:

[0018] This utility model discloses a low-fuel-evaporation system with unobstructed fuel flow, comprising a fuel tank, a carbon canister, a carburetor, and a fuel switch. The fuel tank's lower inlet is connected to the carburetor's inlet via the fuel switch, and its outlet is connected to the carbon canister's adsorption port via an adsorption pipe equipped with a two-way valve. The carbon canister's desorption port is connected to the carburetor's desorption port via a desorption pipe equipped with a PCV valve. The PCV valve's negative pressure port is connected to the carburetor's negative pressure port, and the carburetor's atmospheric balance port is connected to an atmospheric balance port solenoid valve. To address the technical problem of unobstructed fuel flow due to ambient temperature, the solution involves setting a first one-way valve connecting the outlet to the atmospheric balance port solenoid valve, a second one-way valve connecting the fuel tank to the atmosphere, or a second PCV valve connected to the carburetor's negative pressure port between the inlet and the carbon canister. Regardless of changes in the engine's operating ambient temperature, the fuel tank maintains pressure balance during engine operation, ensuring unobstructed fuel flow from the fuel tank to the carburetor, thereby guaranteeing normal engine operation and preventing unexpected shutdowns.

[0019] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0020] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0021] The accompanying drawings are not drawn to scale according to a true reference numeral. In the drawings, each identical or nearly identical component shown in the various figures can be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0022] Figure 1 This invention provides the framework for a low-fuel-evaporation system with unobstructed oil passages. Figure 1 ;

[0023] Figure 2 This invention provides the framework for a low-fuel-evaporation system with unobstructed oil passages. Figure 2 ;

[0024] Figure 3 This invention provides the framework for a low-fuel-evaporation system with unobstructed oil passages. Figure 3 .

[0025] The specific meanings of each mark in the diagram are as follows:

[0026] 1-Fuel tank, 2-Carbon canister, 3-Carburetor, 4-Fuel switch, 5-Two-way valve, 6-PCV valve, 7-Atmospheric balance hole solenoid valve, 8-First check valve, 9-Second PCV valve, 10-Second check valve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0028] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof.

[0029] Based on the technical concept of reducing evaporative emissions from fuel engines, existing fuel engines equipped with low fuel evaporation systems may experience fuel circuit obstruction when the ambient temperature changes, preventing fuel from entering the engine normally and causing abnormal engine shutdown. The present invention aims to propose a low fuel evaporation system that ensures smooth fuel circuit while reducing the amount of fuel evaporation in the fuel engine, thereby reducing unexpected engine shutdowns.

[0030] The present invention discloses a low fuel evaporation system with smooth oil passage, which will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] Combination Figure 1As shown, the low fuel evaporation system with smooth fuel flow includes a fuel tank 1, a carbon canister 2, a carburetor 3, and a fuel switch 4. The lower fuel inlet of the fuel tank 1 is connected to the fuel inlet of the carburetor 3 via a fuel delivery pipeline, and the fuel switch 4 is located on the fuel delivery pipeline. The exhaust port of the breather on the fuel tank 1 is connected to the adsorption port of the carbon canister 2 via an adsorption pipeline, and a two-way valve 5 is installed on the adsorption pipeline. The desorption port of the carbon canister 2 is connected to the desorption port of the carburetor 3 via a desorption pipeline, and a PCV valve 6 is installed on the desorption pipeline. The negative pressure port of CV valve 6 is connected to the negative pressure port of carburetor 3; the atmospheric balance port of carburetor 3 is connected to an atmospheric balance port solenoid valve 7. To solve the problem of fuel tank 1 not dispensing fuel and fuel circuit obstruction caused by changes in ambient temperature, a first one-way valve 8 is provided between the air outlet of the breather device on fuel tank 1 and the atmospheric balance port solenoid valve 7; therefore, when the fuel engine starts, the atmospheric balance port solenoid valve 7 opens, and the first one-way valve 8 conducts one-way flow to the air outlet, so that the internal pressure of fuel tank 1 is consistent with the atmosphere, keeping the fuel circuit unobstructed.

[0033] As shown in the figure, one end of the first one-way valve 8 is connected to the adsorption pipeline and is located between the two-way valve 5 and the outlet. The other end is connected to the atmospheric balance hole solenoid valve 7. When working, when the pressure difference between the two passages on both sides of the first one-way valve 8 reaches the range of -0.5 to -0.1 kPa, it will unilaterally guide the air to the outlet.

[0034] As shown in the attached diagram, the low fuel evaporation system uses a two-way valve 5 to control the flow direction of the evaporated gas. During operation, when there is too much oil vapor inside the fuel tank 1, causing excessive pressure, the pressure difference across the two-way valve 5 exceeds a critical value. If set at 2-5 kPa, it will conduct in the forward direction. At this time, the carbon canister 2 will adsorb the excess oil vapor inside the fuel tank 1, thereby maintaining the pressure inside the fuel tank 1 within the required range. When the pressure inside the fuel tank 1 is too low, the two-way valve 5 will conduct in the reverse direction, replenishing the fuel tank 1 with air through the carbon canister 2. When the pressure inside the fuel tank 1 is too low and does not reach the critical pressure difference value required by the two-way valve 5, the first one-way valve 8 will operate to replenish the fuel tank 1 with air.

[0035] Example 2

[0036] Combination Figure 2 As shown, another structure for a low fuel evaporation system with unobstructed fuel flow is proposed. In this embodiment, the connection structure of the fuel tank 1, carbon canister 2, carburetor 3, and fuel switch 4 remains unchanged. The only difference is that a second PCV valve 9 is connected between the air outlet of the breather device on the fuel tank 1 and the adsorption port of the carbon canister 2. The negative pressure port of the second PCV valve 9 is connected to the negative pressure port of the PCV valve 6. Figure 2In the structure shown, when the fuel engine starts, the engine generates negative pressure, and when the negative pressure reaches the range of -2 to -0.5 kPa, the second PCV valve 9 opens, and the inside of the fuel tank 1 is connected to the atmosphere through the carbon canister 2 to keep the fuel circuit unobstructed.

[0037] Further integration Figure 2 As shown, the second PCV valve 9 is arranged in parallel with the bidirectional valve 5 on the adsorption pipeline.

[0038] Example 3

[0039] Example 3 presents a low fuel evaporation system with smooth fuel flow, such as... Figure 3 As shown, the system includes a fuel tank 1, a carbon canister 2, a carburetor 3, and a fuel switch 4. The connection method of the fuel tank 1, carbon canister 2, carburetor 3, and fuel switch 4 is the same as in Embodiment 1. The only difference is that a second one-way valve 10 is provided on the top of the fuel tank 1. When the fuel engine starts and the fuel tank 1 generates negative pressure, the pressure difference between the two passages of the second one-way valve 10 reaches the range of -0.5 to -0.1 kPa, so that it can conduct one-way to the inside of the fuel tank 1, such as directly to the cavity area inside the fuel tank or directly to the air outlet of the fuel tank, thus keeping the fuel circuit unobstructed.

[0040] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A low-fuel-evaporation system with unobstructed fuel flow, characterized in that, This includes the fuel tank, carbon canister, carburetor, and fuel switch; The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is installed on the fuel pipeline; the outlet of the fuel tank's breather is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, with the negative pressure port of the PCV valve connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve, and a first one-way valve is installed between the outlet of the fuel tank's breather and the atmospheric balance orifice solenoid valve; When the fuel engine starts, the atmospheric balance orifice solenoid valve opens. When the fuel tank generates negative pressure, the first one-way valve unidirectionally guides the fuel to the outlet to keep the fuel circuit unobstructed.

2. The low fuel evaporation system with unobstructed oil passages according to claim 1, characterized in that, One end of the first one-way valve is connected to the adsorption pipeline and is located between the two-way valve and the outlet, while the other end is connected to the atmospheric balance hole solenoid valve.

3. A low-fuel-evaporation system with unobstructed fuel flow, characterized in that, This includes the fuel tank, carbon canister, carburetor, and fuel switch; The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is located on the fuel pipeline; the outlet of the fuel tank's upper breather is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, with the negative pressure port of the PCV valve connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve; a second PCV valve is connected between the outlet of the fuel tank's upper breather and the adsorption port of the carbon canister, with the negative pressure port of the second PCV valve connected to the negative pressure port of the PCV valve; When the combustion engine starts, the engine generates negative pressure, the second PCV valve opens, and flows to the outlet to keep the fuel line unobstructed.

4. The low fuel evaporation system with unobstructed oil passages according to claim 3, characterized in that, The second PCV valve is connected in parallel with the bidirectional valve on the adsorption pipeline.

5. A low fuel evaporation system with smooth fuel flow, characterized in that, This includes the fuel tank, carbon canister, carburetor, and fuel switch; The lower fuel inlet of the fuel tank is connected to the fuel inlet of the carburetor via a fuel pipeline, and the fuel switch is located on the fuel pipeline; the exhaust port of the breather device on the fuel tank is connected to the adsorption port of the carbon canister via an adsorption pipeline, and a two-way valve is installed on the adsorption pipeline; the desorption port of the carbon canister is connected to the desorption port of the carburetor via a desorption pipeline, and a PCV valve is installed on the desorption pipeline, and the negative pressure port of the PCV valve is connected to the negative pressure port of the carburetor; an atmospheric balance orifice of the carburetor is connected to an atmospheric balance orifice solenoid valve; A second one-way valve is installed on the top of the oil tank. When the oil tank generates negative pressure, the second one-way valve opens to the inside of the oil tank in one direction to keep the oil passage unobstructed.

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