Engine and operation device
By connecting the pipeline between the carburetor vent and the fuel tank, the problems of fuel leakage and fuel damage during the engine storage state are solved, and the normal operation of the carburetor and the safe return of fuel are achieved.
Patent Information
- Application Number
- CN202421076759.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-17
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-17
AI Technical Summary
When the engine is stored, the carburetor is prone to fuel leakage, and storing fuel for a long time will affect the working reliability of the carburetor.
By connecting the pipeline between the vent hole of the carburetor and the fuel tank, the pressure inside the oil cup of the carburetor is kept balanced with the external atmospheric pressure. When the engine is in the storage state, the fuel overflows through the vent hole and is received by the pipeline. Avoid fuel leakage and direct overflow fuel into the fuel tank to solve fuel damage.
It effectively avoids fuel leakage when the engine is in the storage state, and prevents damage caused by long-term storage of fuel in the carburetor, improving the working reliability of the carburetor.
Smart Images
Figure CN222296379U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a combustion engine.
[0002] The utility model also relates to an operating device with different use states and storage states. Background Art
[0003] The fuel supply system of an engine is a system for supplying fuel to a combustion engine. Its structure generally includes a fuel tank for storing fuel and a carburetor for atomizing the fuel and mixing it with air. A fuel pipe is connected between the fuel tank and the carburetor so that the fuel tank can supply fuel to the carburetor in time. The carburetor includes an oil cup that can store a certain amount of fuel. The carburetor is also provided with a vent for balancing the pressure in the oil cup. The vent is connected to the external atmosphere to keep the pressure in the oil cup balanced. The fuel tank is also provided with a vent to keep the pressure inside the fuel tank balanced with the external atmosphere. In general, the use state and storage state of the engine are consistent, and the fuel in the oil cup of the carburetor will not leak from the vent. However, for some special working devices, since the use state and storage state of the working device are very different, when the working device is changed from the use state to the storage state, the working device needs to be flipped at a certain angle, causing the engine installed on the working device to flip at a certain angle, which easily leads to fuel leakage from the oil cup of the carburetor. For example, if the working device is a walking lawn mower used for lawn mowing, its horizontal projection area in use state is relatively large, but its height dimension is relatively small. In order to reduce the horizontal area occupied by the walking lawn mower when it is stored, the walking lawn mower is generally flipped 90° from the use state to a vertical placement state for storage. At this time, the walking lawn mower is prone to carburetor fuel leakage.
[0004] European patent document EP3045030B1 discloses a technical solution, an engine and a lawn mower that can be stored vertically, comprising: a gasoline engine, the engine being configured to run in a substantially horizontal direction and to be stored in a substantially vertical direction without leaking liquid in the gasoline engine; the engine comprising a carburetor oil cup configured to store a certain amount of gasoline; and an oil cup vent, which specifically has a ventilation outlet, and when the engine is in a vertical direction, the ventilation outlet is positioned to extend above the horizontal plane of the gasoline. This prior art solves the problem of fuel leakage when the engine is in a vertical direction by positioning the ventilation outlet to extend above the horizontal plane of the gasoline. Although this prior art solves the problem of fuel leakage when the engine is stored vertically, the long-term storage of the fuel in the oil cup will affect the working reliability of the carburetor, such as impurities formed after the fuel evaporates and clogging the carburetor. Utility Model Content
[0005] The utility model aims to provide an optional engine different from the prior art, so as to solve the problem that the carburetor is prone to fuel leakage when the engine is in a storage state in the prior art.
[0006] In order to achieve the above-mentioned purpose, the utility model provides an engine, including a carburetor and a fuel tank; the carburetor is provided with an oil cup, and the oil cup is used to store a certain amount of fuel; the carburetor is provided with a vent hole that connects the oil cup with the atmosphere when the engine is in use, and the vent hole is sealed with a pipeline that is connected to both the atmosphere and the fuel tank.
[0007] By connecting a pipeline between the vent and the fuel tank, when the engine is in normal use, the vent is connected to the atmosphere through the pipeline, so that the pressure in the oil cup of the carburetor is balanced with the external atmospheric pressure, so that the carburetor can work normally; when the engine is in the storage state, the fuel in the oil cup of the carburetor will be received by the pipeline when it overflows through the vent, thereby preventing the fuel from leaking into the external environment through the vent. The pipeline can block the fuel entering the vent, thereby preventing more fuel from entering the vent, or the pipeline can guide the fuel overflowing from the vent into the fuel tank, thereby avoiding the problem of fuel leakage in the carburetor.
[0008] Preferably, the vent hole is located at the bottom of the oil cup of the carburetor when the engine is in the storage state. Herein, the bottom of the oil cup of the carburetor when the engine is in the storage state refers to a position near the area where the gravitational potential energy is the smallest in the cup mouth area of the oil cup, which can allow the fuel in the oil cup to be completely or almost completely discharged. With such a setting, when the engine is in the storage state, the fuel in the oil cup of the carburetor is directly collected at the vent hole under the action of gravity and discharged into the pipeline, thereby realizing the automatic emptying of the oil cup. In this way, while solving the problem of fuel leakage that is prone to occur when the engine is in the storage state, it also solves the problem of the carburetor being damaged by the fuel stored in the carburetor for a long time.
[0009] Preferably, the pipeline includes a main pipe connecting the vent hole to the fuel tank, and the pipeline also includes a branch pipe connecting the main pipe to the atmosphere. With such an arrangement, when the engine is in the storage state, the fuel in the oil cup flows back to the fuel tank through the main pipe; when the engine is in use, when the main pipe is blocked by fuel, the vent hole can be connected to the atmosphere through the branch pipe, thereby improving the reliability of the pipeline when in use.
[0010] Preferably, the branch pipe is arranged close to the vent hole, and the end of the branch pipe away from the main pipe is arranged toward the carburetor. With such an arrangement, when the engine is in the storage state, the end of the branch pipe away from the main pipe is higher than the end of the branch pipe connected to the main pipe, thereby preventing the fuel from leaking from the branch pipe after flowing out of the carburetor, thereby making the arrangement of the branch pipe simple and reliable.
[0011] Preferably, the angle between the branch pipe and the end of the main pipe connected to the vent hole is in the range of 20°-90°.
[0012] Preferably, the branch pipe is connected to the main pipe via a multi-way joint.
[0013] Preferably, one end of the main pipe connected to the fuel tank is higher than the highest liquid level in the fuel tank. With such an arrangement, the fuel in the fuel tank is not easy to enter the main pipe and block the main pipe, thereby reducing the occurrence of fuel blocking the main pipe and affecting the normal use of the carburetor.
[0014] Preferably, in order to take into account the effects of both oil return and ventilation of the main pipe, one end of the main pipe communicating with the fuel tank is located inside the fuel filling port of the fuel tank.
[0015] Preferably, in order to further reduce the amount of fuel in the fuel tank entering the pipeline, a liquid level partition for blocking the fuel from entering the main pipeline is provided at the fuel filling port of the fuel tank.
[0016] Preferably, in order to further reduce the fuel in the fuel tank from flowing into the carburetor through the pipeline, a gas-liquid separation part cooperating with the main pipe is provided at the fuel filling port of the fuel tank, and the gas-liquid separation part is provided with a tortuous air passage communicating with the main pipe.
[0017] Preferably, in order to further simplify the structure, an oil level indicator is provided at the fuel filling port of the fuel tank, and the liquid level separator and the gas-liquid separator are both integrally formed with the oil level indicator.
[0018] Preferably, in order to further prevent the fuel in the fuel tank from flowing into the carburetor through the pipeline, the main pipe includes a liquid storage section and a liquid blocking section, both of which are located between the branch pipe and the fuel tank, the liquid storage section is located between the liquid blocking section and the fuel tank, and the liquid blocking section is located on the upper side of the liquid storage section.
[0019] Preferably, the liquid storage section is U-shaped.
[0020] Preferably, one end of the pipeline connected to the fuel tank is higher than the rated maximum liquid level in the fuel tank, and the fuel tank is provided with a vent that connects the space above the rated maximum liquid level in the fuel tank with the atmosphere. With such a configuration, the pipeline is connected to the cavity portion above the rated maximum liquid level in the fuel tank, and at the same time, the cavity portion above the rated maximum liquid level of the fuel tank is connected to the atmosphere through the vent, so that the pipeline is connected to the atmosphere through the cavity portion above the rated maximum liquid level in the fuel tank, so that the structure of the pipeline is simpler and convenient for processing and manufacturing.
[0021] Preferably, the vent portion includes a vent hole that connects a space above a rated maximum liquid level in the fuel tank to the atmosphere.
[0022] The utility model also provides an operating device, comprising any one of the above engines.
[0023] The utility model has the following beneficial effects:
[0024] Compared with the prior art, the utility model solves the problems of fuel leakage in the carburetor and fuel corrosion damage to the carburetor when the engine is in the storage state. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of an embodiment of the utility model in which a working device is in use;
[0026] Figure 2 It is a schematic diagram of an embodiment of the utility model in which a working device is in a storage state;
[0027] Figure 3 for Figure 1 Schematic diagram of the engine in use;
[0028] Figure 4 for Figure 2 Schematic diagram of the engine in the stowed state;
[0029] Figure 5 for Figure 3 Schematic diagram of the oil level indicator;
[0030] Figure 6 for Figure 4 Bottom view of the middle carburetor;
[0031] Figure 7 for Figure 6 Middle AA section view. DETAILED DESCRIPTION
[0032] The oil level indicator refers to a component installed at the fuel filling port for marking the maximum rated filling amount of the fuel tank. When the fuel liquid level in the fuel tank reaches the bottom of the oil level indicator, it indicates that the fuel in the fuel tank has reached the maximum rated filling amount.
[0033] A tortuous airway means that the airway is not a straight-through type, but is formed by multiple bends.
[0034] The liquid level dividing portion is used to divide the turbulent liquid level at the fuel filling port into a plurality of small liquid levels, thereby reducing the impact force of the liquid level.
[0035] The following is further described in detail through specific implementation methods:
[0036] The reference numerals in the drawings of the specification include: frame 1, engine 2, body 21, carburetor 22, oil cup 221, vent 222, pipeline 23, main pipe 231, branch pipe 232, liquid blocking section 2311, liquid storage section 2312, fuel tank 24, oil level indicator 241, fuel filling port 242, oil return port 243, gas-liquid separation part 244, zigzag air passage 245, liquid level partition 246, rated maximum liquid level 247, fuel supply pipe 25.
[0037] Example: Figure 1 and Figure 2 As shown, a working device includes a frame 1 and an engine 2, and the engine 2 is installed on the frame 1. In this embodiment, the working device is a walking lawn mower. Of course, in other embodiments, the working device can also be a snow blower, a concrete trowel, etc., and the use state of the working device is the state when the frame 1 is placed horizontally (such as Figure 1 As shown in FIG. 1 , the storage state of the working device is the state when the frame 1 is placed vertically (as shown in FIG. Figure 2 When the working device is switched from the use state to the storage state, the frame 1 needs to be flipped 90 degrees, so the engine 2 installed on the frame 1 is also flipped 90 degrees.
[0038] like Figure 3 As shown, the engine 2 includes a body 21 mainly composed of a cylinder and a crankcase, and also includes a carburetor 22 and a fuel tank 24. The carburetor 22 and the fuel tank 24 are connected and supported on the body 21. When the engine 2 is in use (such as Figure 3 As shown in FIG. 1 ), the carburetor 22 and the fuel tank 24 are distributed around the engine body 21 along the horizontal plane; when the engine 2 is in the storage state (as shown in FIG. 1 ), the carburetor 22 and the fuel tank 24 are distributed around the engine body 21 along the horizontal plane; Figure 4 As shown in the figure, the fuel tank 24 is located below the engine body 21, and the carburetor 22 is located on the horizontal side of the engine body 21 and is higher than the fuel tank 24.
[0039] The carburetor 22 is provided with an oil cup 221 and a vent hole 222. A fuel supply pipe 25 is connected between the carburetor 22 and the fuel tank 24. The fuel tank 24 supplies fuel to the carburetor 22 through the fuel supply pipe 25. In order to control the fuel supply of the fuel supply pipe 25 and prevent the fuel supply pipe 25 from supplying too much fuel to the carburetor 22, a valve connected to the fuel supply pipe 25 is provided on the carburetor 22. A float for controlling the opening and closing of the valve is provided in the oil cup 221 of the carburetor 22. The density of the float is less than the density of the fuel. The float rises and falls in the oil cup 221 as the liquid level of the fuel rises and falls. When the liquid level of the fuel in the oil cup 221 drops as the fuel is consumed, and the float drops to a certain position as the liquid level drops, the float opens the valve and the fuel supply pipe 25 supplies fuel to the oil cup 221; when the fuel in the oil cup 221 is gradually injected and the fuel liquid level rises, and the float also moves up to a certain position as the fuel liquid level rises, the float controls the valve to close, and the fuel supply pipe 25 stops supplying fuel to the oil cup 221. When the engine 2 is in use, the carburetor 22 is also in normal use. At this time, the vent hole 222 on the carburetor 22 is located above the oil cup 221, so that the part of the oil cup 221 that is not filled with fuel is connected to the vent hole 222. When the gas pressure in the oil cup 221 changes, it can be adjusted in time through the vent hole 222 to keep the pressure in the oil cup 221 balanced.
[0040] The vent hole 222 is sealed with a pipe 23 that is connected to both the atmosphere and the fuel tank 24. The pipe 23 is used to connect the oil cup to the atmosphere when the engine 2 is in use, and is also used to prevent the fuel in the oil cup from leaking to the outside of the engine 2 through the vent hole 222 when the engine 2 is in the storage state. In this embodiment, the vent hole 222 is located at the bottom of the oil cup 221 of the carburetor 22 when the engine 2 is in the storage state. A more preferred solution is that the vent hole 222 is located at the lowest point of the oil cup 221 of the carburetor 22 when the engine 2 is in the storage state (such as Figure 4 , Figure 6 and Figure 7 As shown), the fuel in the oil cup 221 is collected toward the vent hole 222 under the action of gravity and discharged until the oil cup 221 is emptied.
[0041] like Figure 3 and Figure 4As shown, in this embodiment, the pipeline 23 includes a main pipe 231 that connects the vent hole 222 with the fuel tank 24, and the pipeline 23 also includes a branch pipe 232 that connects the main pipe 231 with the atmosphere. For the convenience of processing, the branch pipe 232 is connected to the main pipe 231 through a three-way joint. Of course, in other embodiments, the branch pipe 232 and the main pipe 231 can be arranged in an integrally formed manner. The branch pipe 232 is arranged near the vent hole 222, and one end of the branch pipe 232 away from the main pipe 231 is arranged toward the carburetor 22, so that when the engine 2 is in the storage state, the end of the branch pipe 232 away from the main pipe 231 is higher than the other end of the branch pipe 232, so that the fuel in the oil cup 221 that enters the main pipe 231 through the vent hole 222 will not enter the branch pipe 232, thereby avoiding the leakage of fuel through the branch pipe 232. Specifically, the angle between the branch pipe 232 and the end of the main pipe 231 connected to the vent hole 222 ranges from 20° to 90°. In this embodiment, the angle between the branch pipe 232 and the main pipe 231 is preferably 30°. In other embodiments, the angle between the branch pipe 232 and the main pipe 231 can also be 20°, 40°, 50°, 60°, 70°, 80°, 90°, etc.
[0042] like Figure 3 As shown, the end of the main pipe 231 connected to the fuel tank 24 is higher than the rated maximum liquid level 247 in the fuel tank 24, so that the end of the main pipe 231 connected to the fuel tank 24 is always located in the space above the fuel liquid level. The rated maximum liquid level 247 of the fuel tank 24 refers to the horizontal plane where the maximum liquid level of the fuel is located when the fuel tank 24 is filled with fuel in the normal use state specified during design. The end of the main pipe 231 connected to the fuel tank 24 is located on the inner side of the fuel filling port 242. In this embodiment, the main pipe 231 passes through the shell of the fuel tank 24 from the position on the fuel tank 24 near the fuel filling port 242, and then extends inside the fuel tank 24 to the fuel filling port 242.
[0043] like Figure 3 and Figure 5 As shown, a liquid level partition 246 for blocking fuel from entering the main pipe 231 is provided at the fuel filling port 242 of the fuel tank 24. A gas-liquid separator 244 cooperating with the main pipe 231 is provided at the fuel filling port 242 of the fuel tank 24, and the gas-liquid separator 244 is provided with a zigzag air passage 245 communicating with the main pipe 231. The main pipe 231 is communicated with the interior of the fuel tank 24 through the gas-liquid separator 244 and the zigzag air passage 245, so as to further block the fuel in the fuel tank 24 from entering the main pipe 231. An oil level indicator 241 is provided at the fuel filling port 242 of the fuel tank 24, and the liquid level partition 246 and the gas-liquid separator 244 are integrally formed with the oil level indicator 241. The oil level indicator 241 is provided with an oil return port 243 communicating with the main pipe 231.
[0044] like Figure 3 and Figure 4 As shown, the main pipe 231 includes a liquid storage section 2312 and a liquid blocking section 2311, both of which are located between the branch pipe 232 and the fuel tank 24, the liquid storage section 2312 is located between the liquid blocking section 2311 and the fuel tank 24, and the liquid blocking section 2311 is located on the upper side of the liquid storage section 2312. Regardless of whether the engine 2 is in use or in storage, the liquid blocking section 2311 can prevent the fuel entering the liquid storage section 2312 from continuing to pass through the liquid blocking section 2311 and flow toward the carburetor 22. The liquid storage section 2312 is used to temporarily store the fuel that enters the main pipe 231 from the fuel tank 24 in extreme cases. The liquid storage section 2312 is U-shaped, specifically, it is naturally formed by bending a part of the main pipe 231. When the engine 2 is in the storage state, the end of the liquid storage section 2312 connected to the liquid blocking section 2311 is higher than the end of the liquid storage section 2312 connected to the fuel tank 24, so that the fuel in the liquid storage section 2312 flows from the liquid blocking section 2311 toward the fuel tank 24, and the fuel flows back into the fuel tank 24, avoiding the fuel from being stored in the liquid storage section 2312 for a long time.
[0045] The specific implementation process is as follows: when the operating device is in use, that is, the engine 2 is in use, the oil cup 221 of the carburetor 22 is connected to the atmosphere through the vent 222, the main pipe 231 and the branch pipe 232, so that the carburetor 22 can work normally; when the operating device is in the storage state, that is, the engine 2 is in the storage state, the fuel in the oil cup 221 of the carburetor 22 flows back to the fuel tank 24 through the vent 222 and the main pipe 231, which not only avoids the problem of fuel leakage when the engine 2 is in the storage state, but also avoids the problem of fuel being stored in the carburetor 22 for a long time and corroding and damaging the carburetor 22.
[0046] In another embodiment, one end of the pipeline 23 connected to the fuel tank 24 is higher than the rated maximum liquid level 247 in the fuel tank 24, and a vent is provided on the fuel tank 24 to connect the space above the rated maximum liquid level 247 in the fuel tank 24 with the atmosphere. The vent includes a vent to connect the space above the rated maximum liquid level 247 in the fuel tank 24 with the atmosphere. Therefore, when the working device is in use, that is, when the engine 2 is in use, the oil cup 221 of the carburetor 22 is connected to the atmosphere through the vent 222, the pipeline 23, the space above the rated maximum liquid level 247 in the fuel tank 24, and the vent of the fuel tank 24 in sequence, so as to maintain the pressure balance in the oil cup 221; when the working device is in the storage state, that is, when the engine 2 is in the storage state, the fuel in the oil cup 221 flows back to the fuel tank 24 through the vent 222 and the pipeline 23 in sequence, so as to empty the oil cup 221.
[0047] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.
Claims
1. An engine, comprising a carburetor and a fuel tank; the carburetor is provided with an oil cup, the oil cup is used to store a certain amount of fuel; the carburetor is provided with a vent hole that connects the oil cup with the atmosphere when the engine is in use, characterized in that: The vent hole is sealed with a pipeline that is in communication with the atmosphere and the fuel tank at the same time.
2. The engine according to claim 1, characterized in that: The vent hole is located at the bottom of the oil cup of the carburetor when the engine is in the storage state.
3. The engine according to claim 1 or 2, characterized in that: The pipeline includes a main pipe connecting the vent hole with the fuel tank, and the pipeline also includes a branch pipe connecting the main pipe with the atmosphere.
4. The engine according to claim 3, characterized in that: The branch pipe is arranged close to the vent hole, and one end of the branch pipe away from the main pipe is arranged toward the carburetor.
5. The engine according to claim 4, characterized in that: The included angle between the branch pipe and the end of the main pipe connected to the vent hole ranges from 20° to 90°.
6. The engine according to claim 5, characterized in that: The branch pipe is connected to the main pipe through a multi-way joint.
7. The engine according to any one of claims 4 to 6, characterized in that: One end of the main pipe communicating with the fuel tank is higher than the highest liquid level in the fuel tank.
8. The engine according to claim 7, characterized in that: One end of the main pipe communicating with the fuel tank is located inside the fuel filling port of the fuel tank.
9. The engine according to claim 8, characterized in that: A liquid level partition for blocking fuel from entering the main pipe is arranged at the fuel filling port of the fuel tank.
10. The engine according to claim 9, characterized in that: A gas-liquid separation part matched with the main pipe is arranged at the fuel filling port of the fuel tank, and the gas-liquid separation part is provided with a tortuous air passage communicated with the main pipe.
11. The engine according to claim 10, characterized in that: An oil level indicator is arranged at the fuel filling port of the fuel tank, and the liquid surface separation part and the gas-liquid separation part are both integrally formed with the oil level indicator.
12. An engine according to claim 4, 5, 6, 8, 9, 10 or 11, characterized in that: The main pipe includes a liquid storage section and a liquid blocking section, both of which are located between the branch pipe and the fuel tank, the liquid storage section is located between the liquid blocking section and the fuel tank, and the liquid blocking section is located on the upper side of the liquid storage section.
13. The engine according to claim 12, characterized in that: The liquid storage section is U-shaped.
14. The engine according to claim 1, characterized in that: One end of the pipeline connected to the fuel tank is higher than the rated maximum liquid level in the fuel tank, and the fuel tank is provided with a vent to connect the space above the rated maximum liquid level in the fuel tank with the atmosphere.
15. The engine according to claim 14, characterized in that: The vent portion includes a vent hole that connects a space above a rated maximum liquid level in the fuel tank to the atmosphere.
16. A working device, characterized in that: Comprising an engine as claimed in any one of claims 1 to 15.