Leakproof carburetor

Abstract

The utility model discloses a kind of leak-proof carburettors, including carburettor main body, float chamber and balance hole, storage oil way is opened in the interior of carburettor main body, balance hole is communicated with float chamber by storage oil way and balance hole is located the high point of storage oil way, the storage oil way has the oil inlet of communicating float chamber, when: the fuel level of oil inlet in float chamber or below, storage oil way enters fuel and stores, or, the fuel level of oil inlet in float chamber above;The utility model ensures that fuel cannot flow out by balance hole, play fuel saving, prevent environmental pollution and security risk, improve engine safety, at the same time, storage oil way is opened in the interior of carburettor main body, the volume of carburettor whole does not change, compared with the leak-proof carburettor of additional anti-tipping valve or additional fuel container of external communication outside balance hole, the assembly space required is smaller, convenient assembly.

Description

Technical Field

[0001] This utility model relates to the field of carburetor technology, and in particular to a leak-proof carburetor. Background Technology

[0002] As a key component of an internal combustion engine, the carburetor's core function is to mix air and fuel in a suitable ratio to form a combustible mixture, ensuring efficient engine operation. To maintain stable air pressure inside the float chamber and ensure precise fuel supply, carburetors typically have a balance hole at the top of the float chamber. Generally, the balance hole of an externally balanced carburetor is directly connected to the outside atmosphere, while the balance hole of an internally balanced carburetor is usually connected to the air filter to maintain stable air pressure inside the float chamber and ensure normal carburetor operation.

[0003] In existing technologies, when an engine tilts due to different usage scenarios, and the tilt angle reaches a certain level, the fuel level in the float chamber will exceed the balance hole, causing fuel to leak through the balance hole. This not only wastes fuel but also pollutes the environment and may even cause safety hazards such as fires. Existing carburetors often connect an external fuel container to the balance hole or add an anti-tipping valve. Although this can prevent fuel leakage to some extent, it will increase the overall size of the carburetor, increase the required assembly space, and increase the weight, making the installation of the carburetor inconvenient.

[0004] Therefore, it is necessary to improve the structure of existing carburetors to ensure that fuel in the float chamber does not leak from the balance hole when the carburetor is tilted, thereby saving fuel, preventing environmental pollution and safety hazards, and improving engine safety. At the same time, the overall size of the carburetor remains unchanged. Compared with leak-proof carburetors that have an external fuel container or an additional anti-tipping valve connected to the balance hole, the required assembly space is smaller and easier to assemble. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a leak-proof carburetor that can ensure that fuel in the float chamber will not leak from the balance hole when the carburetor is tilted, thereby saving fuel, preventing environmental pollution and safety hazards, and improving engine safety. At the same time, the overall volume of the carburetor remains unchanged. Compared with leak-proof carburetors that have an external fuel container or an additional anti-tipping valve connected to the balance hole, it requires less assembly space and is easier to assemble.

[0006] This utility model discloses a leak-proof carburetor, comprising a carburetor body, a float chamber, and a balance hole. The carburetor body has an internal fuel storage passage. The balance hole is connected to the float chamber via the fuel storage passage and is located at the highest point of the fuel storage passage. The fuel storage passage has an inlet connecting to the float chamber. When the carburetor is tilted to a set angle:

[0007] The oil inlet is located at or below the fuel level in the float chamber, and the storage oil passage receives and stores fuel; alternatively, the oil inlet is located above the fuel level in the float chamber.

[0008] Furthermore, it also includes an oil inlet channel, which is opened in the carburetor body and located above the float chamber to form the oil inlet.

[0009] Furthermore, the storage oil circuit includes a main oil circuit and a branch oil circuit. The branch oil circuit is connected to the main oil circuit, the balance hole is connected to one end of the main oil circuit, the oil inlet is connected to the other end of the main oil circuit, and the branch oil circuit is connected to a set position of the main oil circuit and is a blind oil circuit.

[0010] Furthermore, the main oil circuit includes oil circuit I and oil circuit II arranged laterally. The balance hole is connected to oil circuit I, the oil inlet channel is connected to oil circuit II, and oil circuit II is arranged orthogonally to oil circuit I and connected at the end away from the balance hole.

[0011] Furthermore, the axis of the branch oil circuit is in the same vertical plane as the axis of oil circuit I, and the branch oil circuit extends downward at a set angle towards oil circuit I; oil circuit II is connected to the branch oil circuit near oil circuit I, so that oil circuit I and oil circuit II are connected.

[0012] Furthermore, the length of oil circuit I is greater than the length of oil circuit II, and oil circuit I is orthogonal to oil circuit II and located above oil circuit II.

[0013] Furthermore, the balance hole is located at the top of the carburetor body, and the balance hole is connected to the end of the oil passage I away from the branch oil passage through a connecting pipe. The connecting pipe is L-shaped, so that the balance hole is higher than the oil passage I.

[0014] Furthermore, the flow area of ​​the oil passage II gradually decreases towards the oil inlet channel.

[0015] Furthermore, it also includes an extension pipe. The oil inlet channel includes a vertical oil inlet section and a horizontal oil inlet section connected to the vertical oil inlet section. One end of the extension pipe is sealed and connected to oil circuit II, and the other end extends into the horizontal oil inlet section to a set length. The connection between the vertical oil inlet section and the horizontal oil inlet section is located within the length range of the extension pipe extending into the horizontal oil inlet section.

[0016] The beneficial effects of this utility model are as follows: The leak-proof carburetor of this utility model has a fuel storage passage between the balance hole and the float chamber. This ensures that when the carburetor is tilted at a set angle, fuel will not flow out of the balance hole, regardless of whether the fuel inlet of the fuel storage passage is below the fuel level in the float chamber. This saves fuel, prevents environmental pollution and safety hazards, and improves engine safety. At the same time, the fuel storage passage is located inside the carburetor body, so the overall volume of the carburetor remains unchanged. Compared with leak-proof carburetors that have an external fuel container or an additional anti-tipping valve connected to the balance hole, the required assembly space is smaller, making assembly easier. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0018] Figure 1 This is a front sectional view of the leak-proof carburetor of this utility model;

[0019] Figure 2 This is a side sectional view of a leak-proof carburetor.

[0020] Explanation of reference numerals in the attached drawings: 1. Carburetor body; 2. Balance hole; 3. Connecting pipe; 4. Float chamber; 5. Oil passage I; 6. Oil passage II; 7. Branch oil passage; 8. Extension pipe; 9. Oil inlet channel; 901. Oil inlet; 902. Vertical oil inlet section; 903. Horizontal oil inlet section. Detailed Implementation

[0021] The following will refer to the appendix in the embodiments of this utility model. Figure 1-2 The technical solutions in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] This utility model discloses a leak-proof carburetor, including a carburetor body 1, a float chamber 4, and a balance hole 2. The carburetor body 1 has an internal fuel storage passage. The balance hole 2 is connected to the float chamber via the fuel storage passage and is located at the highest point of the fuel storage passage. The fuel storage passage has an inlet connecting to the float chamber 4. When the carburetor is tilted to a set angle:

[0024] The oil inlet 901 is located at or below the fuel level in the float chamber, and the storage oil passage enters and stores fuel; or, the oil inlet 901 is located above the fuel level in the float chamber.

[0025] In both states mentioned above, if the fuel inlet 901 is above the liquid surface, there will be no oil leakage. When the fuel inlet is above or below the liquid surface, the fuel storage circuit will store fuel to prevent fuel from flowing out of the balance hole. The fuel storage circuit refers to a horizontal channel opened in the carburetor body to prevent the balance hole from being directly connected to the float chamber 4, thereby preventing fuel from directly entering the balance hole 2. The setting angle is based on the tilt angle range of the carburetor during normal use, generally not exceeding 60 degrees, and the limit will not exceed 90 degrees, which will not be elaborated here.

[0026] The presence of the storage oil passage separates the balance hole 2 and the float chamber 4. The outflowing fuel first passes through the storage oil passage for storage and isolation. The storage oil passage is generally arranged horizontally, or it can be arranged with multiple bends. As long as it can achieve isolation and storage, it will not be described in detail here.

[0027] In this embodiment, an oil inlet channel 9 is also included. The oil inlet channel 9 is formed in the carburetor body 1 and located above the float chamber 4, forming the oil inlet 901 (e.g., Figure 2 (As shown by the dotted line); used to draw fuel from the float chamber 4 to the storage fuel line when the carburetor is tilted and the fuel inlet is below the liquid level; such as Figure 2 As shown, the fuel inlet channel 9 is located above the float chamber 4. Since the fuel storage circuit is located inside the carburetor body 1, under a small tilt, the fuel only needs to enter the fuel inlet channel 9 to achieve the leak-proof effect. Under a large tilt, the fuel needs to enter the fuel storage line through the fuel inlet channel 9 to achieve the leak-proof effect.

[0028] In this embodiment, the storage oil circuit includes a main oil circuit and a branch oil circuit 7. The branch oil circuit 7 is connected to the main oil circuit. The balance hole 2 is connected to one end of the main oil circuit, and the oil inlet is connected to the other end of the main oil circuit. Figure 1 As shown, the branch oil passage 7 is connected to the main oil passage at a set position and is a blind oil passage; the branch oil passage 7 is a blind oil passage, which can provide oil storage space after the carburetor is tilted and fuel enters the storage oil passage, ensuring that fuel leakage is avoided at a large tilt angle.

[0029] In this embodiment, the main oil circuit includes oil circuit I5 and oil circuit II6 arranged laterally. The balance hole 2 is connected to oil circuit I5, and the oil inlet channel is connected to oil circuit II6. Oil circuit II6 is orthogonally arranged and connected to oil circuit I5 at the end away from the balance hole 2 (orthogonal arrangement means that oil circuit I5 and oil circuit II6 are both arranged laterally and perpendicularly). Figure 1As shown, the fuel line I5 has a set height relative to the top of the carburetor to ensure that there is no leakage even when the carburetor is tilted at a large angle. The set height means that it should be as close as possible to the top of the carburetor but avoid interference with other channels. Generally, it is 2-3 mm away from the air intake of the carburetor, which will not be elaborated here. The balance hole 2 is connected to the fuel line I5, and the fuel inlet channel 9 is connected to the fuel line II6. As shown in the figure, the horizontal setting refers to the horizontal direction when the carburetor is upright. At the same time, the vertical direction in this utility model is also based on this, which will not be elaborated here. Since the fuel line I5 and the fuel line II6 are orthogonally arranged and connected, the balance hole 2 and the fuel inlet channel 9 are arranged diagonally. Thus, the projection of the fuel inlet and the balance hole 2 on the horizontal plane is diagonally arranged. When the carburetor is tilted and the fuel inlet is below the liquid surface, the diagonal structure will also make the balance hole far away from the liquid surface due to the fuel storage line, thus avoiding leakage.

[0030] In this embodiment, the axis of the branch oil passage 7 is in the same vertical plane as the axis of oil passage I5, which facilitates processing; and the branch oil passage 7 extends downward at a set angle to the oil passage I5. The set angle is not specifically limited; it simply needs to guide the fuel flow to the branch oil passage 7 after it enters the main oil passage, resulting in better oil storage. The oil passage II6 connects to the branch oil passage 7 near the oil passage I5, thus connecting oil passage I5 and oil passage II6. Figure 1 and 2 As shown, in this structure, assuming fuel enters fuel line II6, it flows to fuel line I5 through branch fuel line 7. Within a certain tilt angle range, fuel first enters branch fuel line 7 and then fuel line I5. When the leakage is small, branch fuel line 7 has sufficient storage capacity; as... Figure 1 As shown, the branch oil passage 7 is connected to the oil passage I5, with the connection point near the right end of the oil passage I5. The left end of the branch oil passage 7 is connected to the right end of the oil passage I5. The branch oil passage 7, connected to the oil passage I5, extends downwards at a predetermined angle to the right end of the branch oil passage 7, forming a blind end. Figure 1 As shown, blind heads can be set up using existing mechanical static sealing plugs, etc., which will not be elaborated here.

[0031] In this embodiment, the length of oil passage I5 is greater than the length of oil passage II6, and oil passage I5 is orthogonal to oil passage II6 and located above oil passage II6; as Figure 1 and 2As shown, oil passage I5 is positioned higher than oil passage II6, that is, above oil passage II6. This increases the horizontal height of the balance hole 2 relative to the fuel in the float chamber 4, allowing for better coordination with the fuel storage passage to prevent fuel leakage when the carburetor is tilted. Typically, oil passage I5 is 6-10 mm longer than oil passage II6. In this embodiment, the length of oil passage I5 is 32.45 mm, and the length of oil passage II6 is 24.5 mm, to ensure that the final passage entering the balance hole 2 has sufficient length.

[0032] In this embodiment, the balance hole 2 is located on the top of the carburetor body 1, and the balance hole 2 is connected to the end of the oil passage I5 away from the branch oil passage via the connecting pipe 3. Figure 1 As shown in the figure, the left end and the right end (which is connected to the branch oil circuit) are connected by an L-shaped connecting pipe, making the balance hole higher than oil circuit I. As shown, one end of the L-shaped connecting pipe is sealed to oil circuit I5, and the other end extends upwards to form a high point. Combined with the oil storage circuit design, it can remain leak-free even when tilted to extreme angles, even greater than 90 degrees. Figure 1 and Figure 2 The tilt can be seen by simulating the tilt, so I won't go into details here.

[0033] In this embodiment, the flow area of ​​the oil passage II 6 gradually decreases towards the oil inlet channel 9, such as... Figure 1 and Figure 2 As shown, the gradually decreasing size of the structure facilitates the return of stored fuel and has the characteristic of preventing fuel outflow, thus helping to prevent leakage.

[0034] In this embodiment, an extension pipe 8 is also included. The oil inlet channel 9 includes a vertical oil inlet section 902 and a horizontal oil inlet section 903 connected to the vertical oil inlet section. One end of the extension pipe 8 is sealed and connected to the oil passage II 6, as shown in the figure. The extension pipe 8 (in this embodiment, a copper pipe is used, which has good plasticity and weldability, is easy to process and connect, and is easy to install. Hollow pipes of other materials can also be used, which will not be described in detail here) is sealed and expanded to one side of the small diameter of the oil passage II 6. The other end extends into the horizontal oil inlet section to a set length and has a gap between it and the side wall of the horizontal oil inlet section 903. The extended end cannot penetrate the entire horizontal oil inlet section 903. The connection between the vertical oil inlet section and the horizontal oil inlet section is located within the length range of the extension pipe extending into the horizontal oil inlet section. In this structure, even if fuel enters the horizontal oil inlet section, it will first submerge the other end of the extension pipe 8 before entering the oil passage II 6 from the extension pipe 8, rather than directly entering the oil passage II 6, thereby increasing the leak prevention capability for larger tilt angles.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A leak-proof carburetor, characterized in that: The carburetor includes a carburetor body, a float chamber, and a balance hole. The carburetor body has an internal fuel storage passage. The balance hole is connected to the float chamber via the fuel storage passage and is located at the highest point of the fuel storage passage. The fuel storage passage has an inlet connecting to the float chamber. When the carburetor is tilted to a set angle: The oil inlet is located at or below the fuel level in the float chamber, and the storage oil passage receives and stores fuel; alternatively, the oil inlet is located above the fuel level in the float chamber.

2. The leak-proof carburetor according to claim 1, characterized in that: It also includes an oil inlet channel, which is located in the carburetor body and forms the oil inlet above the float chamber.

3. The leak-proof carburetor according to claim 1, characterized in that: The storage oil circuit includes a main oil circuit and a branch oil circuit. The branch oil circuit is connected to the main oil circuit. The balance hole is connected to one end of the main oil circuit. The oil inlet is connected to the other end of the main oil circuit. The branch oil circuit is connected to a set position of the main oil circuit and is a blind oil circuit.

4. The leak-proof carburetor according to claim 3, characterized in that: The main oil circuit includes oil circuit I and oil circuit II arranged laterally. The balance hole is connected to oil circuit I, and the oil inlet channel is connected to oil circuit II. Oil circuit II is arranged orthogonally to oil circuit I and connected at the end away from the balance hole.

5. The leak-proof carburetor according to claim 4, characterized in that: The axis of the branch oil circuit is in the same vertical plane as the axis of oil circuit I, and the branch oil circuit extends downward at a set angle towards oil circuit I; oil circuit II is connected to the branch oil circuit near oil circuit I, so that oil circuit I and oil circuit II are connected.

6. The leak-proof carburetor according to claim 4, characterized in that: The length of oil passage I is greater than the length of oil passage II, and oil passage I is orthogonal to oil passage II and located above oil passage II.

7. The leak-proof carburetor according to claim 1, characterized in that: The balance hole is located at the top of the carburetor body. The balance hole is connected to the end of the fuel line I away from the branch fuel line through a connecting pipe. The connecting pipe is L-shaped, so that the balance hole is higher than the fuel line I.

8. The leak-proof carburetor according to claim 4, characterized in that: The flow area of ​​oil passage II gradually decreases towards the oil inlet channel.

9. The leak-proof carburetor according to claim 4, characterized in that: It also includes an extension pipe. The oil inlet channel includes a vertical oil inlet section and a horizontal oil inlet section connected to the vertical oil inlet section. One end of the extension pipe is sealed and connected to oil circuit II, and the other end extends into the horizontal oil inlet section to a set length. The connection between the vertical oil inlet section and the horizontal oil inlet section is located within the length range of the extension pipe extending into the horizontal oil inlet section.

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