Air filter for general engine and general engine

Abstract

The utility model discloses an air filter for a general engine, which comprises a shell, a filter unit, a first cavity for accommodating unfiltered air and a second cavity for accommodating filtered air are arranged in the shell, the first cavity and the second cavity are arranged on two sides of the filter unit, and an air inlet communicated with the first cavity and an air outlet communicated with the second cavity are arranged on the shell. A pressurizing pipe is arranged in the second cavity, the gas inlet end of the pressurizing pipe extends along the side away from the gas inlet and / or the gas outlet, and the gas outlet end of the pressurizing pipe can be connected with an oil-gas mixing device. According to the air filter, the inflating efficiency of the pressurizing pipe can be improved, the whole filtering unit is fully utilized, the filtering effect is ensured, the structure is simple, a shell of an original air filter is reduced or even not changed, and the cost can be reduced. The utility model further discloses a general engine.

Description

Technical Field

[0001] The utility model relates to an air filtering device, in particular to an air filter for a general engine and a general engine. Background Art

[0002] As a machine that converts other forms of energy into mechanical energy, the engine needs to inhale a large amount of air during operation. If the air is not filtered, the dust suspended in the air will be sucked into the cylinder, which will accelerate the wear of the piston group and the cylinder. Larger particles entering between the piston and the cylinder will cause serious "cylinder pulling" phenomenon. Therefore, as an important component of an engine, the air filter is usually installed in front of the oil-gas mixing device or the intake pipe to filter out dust and sand in the air and ensure that sufficient and clean air enters the cylinder. However, the existing general-purpose engines meet the function of dust filtering, but there are few improvements in improving intake efficiency and reducing intake noise.

[0003] At present, the structure of the existing air filter is usually to use a filter element to divide the housing into an unfiltered chamber and a filter chamber, and to set an outlet connected to the oil-gas mixing device in the filter chamber. Alternatively, a supercharging structure is integrally formed in the filter chamber, such as the Chinese patent document CN204267194U discloses a gasoline engine cassette inertial supercharged air filter, which is mainly composed of three working chambers: an intake chamber, a pressure equalizing chamber, and an inner duct chamber in the pressure equalizing chamber, and an air filter core block arranged between the intake chamber and the pressure equalizing chamber. The fresh air inhaled by natural intake is directed and guided by the inner duct chamber of suitable diameter and length, and the inertia of gas flow increases. The inertial supercharging effect of the gas improves the intake scavenging capacity, increases the total amount of air entering, thereby improving the thermal efficiency and fuel utilization rate of fuel combustion, and improving the output power of the gasoline engine. It is characterized by simple and compact structure, small space occupation, easy installation and maintenance, and certain air intake system sound insulation and noise reduction and waterproof functions. It is suitable for low-power medium and high-speed single-cylinder gasoline engines. This prior art can improve the intake efficiency of the engine to a certain extent, but its structure is relatively complex, and its production cost and compatibility with similar products are insufficient, so it cannot be promoted on a large scale. Utility Model Content

[0004] In order to solve the technical problem of the complex structure of the air filter of the engine in the prior art, the utility model provides a universal air filter for the engine, comprising a shell, a filter unit and a first cavity for accommodating unfiltered air and a second cavity for accommodating filtered air on both sides of the filter unit are provided in the shell, an air inlet connected to the first cavity and an air outlet connected to the second cavity are provided on the shell, wherein: a boost pipe is provided in the second cavity, an air inlet end of the boost pipe is extended along a side away from the air inlet and / or the air outlet, and an air outlet end of the boost pipe can be connected to an oil-gas mixing device.

[0005] Compared with the prior art, in this solution, the inflation efficiency of the boost pipe can be improved, and the design of the air inlet end extending along the side away from the air inlet and / or the air outlet can make full use of the filter unit, ensure the filtering effect, have a simple structure, and reduce or even do not change the original air filter shell, thereby reducing costs.

[0006] Preferably, the boosting pipe is provided separately from the housing. This solution can achieve the purpose of air boosting by only adding the boosting pipe without changing the air filter housing, thereby reducing the production cost of the air filter.

[0007] Preferably, a bending section is provided on the boost pipe, and the air inlet end, the bending section and the air outlet end are integrally formed. This solution can improve the air intake efficiency by only adding a bending section, and has a simple structure.

[0008] Preferably, the boost pipe is a flexible pipe. This solution can reduce intake noise.

[0009] Preferably, a connecting flange is provided on one side of the outlet end close to the outlet, and the connecting flange is sealed and connected to the outlet. This solution can reduce the modification of the air filter housing and achieve the connection between the boost pipe and the outlet.

[0010] Preferably, the outlet end is provided with a variable diameter section, and the cross-sectional area of ​​the variable diameter section is smaller than that of the inlet end. This solution can increase the air flow rate by providing the variable diameter section, thereby achieving the purpose of improving the oil and gas atomization effect.

[0011] Preferably, a buffer cavity is provided in the second cavity on one side close to the air inlet end.

[0012] Preferably, an exhaust gas connection nozzle is further provided near the connection flange at the outlet end, and the angle between the exhaust gas connection nozzle and the outlet end is an acute angle. In this solution, the oil discharged from the exhaust gas connection nozzle enters the oil-gas mixing device in the same direction as the air flow direction, which can reduce the oil accumulation at the supercharging pipe and the oil-gas mixing device, thereby achieving the purpose of optimizing the exhaust emission performance of the engine for long-term use.

[0013] Preferably, the axial center angle of the bending section is less than 90°. This solution can improve the inflation effect of the booster tube, has a simple structure, and can reduce production efficiency.

[0014] In a second aspect, the utility model provides a universal engine, including an oil-gas mixing device, and also including an air filter as in any of the above schemes, wherein an air outlet end of the air filter is connected to the oil-gas mixing device.

[0015] Preferably, the connecting flange is connected to the oil-gas mixing device through the air outlet.

[0016] The utility model has the following beneficial effects:

[0017] 1. The utility model can improve the charging efficiency of the boost pipe, make full use of the entire filter unit, ensure the filtering effect, have a simple structure, reduce or even do not change the shell of the original air filter, and can reduce costs.

[0018] 2. The utility model can also reduce the intake noise and achieve the effect of noise reduction.

[0019] 3. The utility model can increase the air flow rate, thereby achieving the purpose of improving the oil and gas atomization effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an air filter for a general engine and an air filter in a general engine embodiment of the utility model;

[0021] Figure 2 for Figure 1 Cross-sectional view①;

[0022] Figure 3 for Figure 1 Sectional view of ②;

[0023] Figure 4 for Figure 3 Schematic diagram of the structure of the middle boost pipe①;

[0024] Figure 5 The schematic diagram of the booster pipe structure ②;

[0025] Figure 6 It is the structural schematic diagram of the boost pipe③;

[0026] Figure 7 It is the structural schematic diagram of the boost pipe④;

[0027] Figure 8 This is the structural schematic diagram of the boost pipe⑤. DETAILED DESCRIPTION

[0028] The following is further described in detail through specific implementation methods:

[0029] 1. Definition

[0030] Booster pipe: A device that can improve the efficiency of air intake. Its working principle mainly has two aspects, namely negative pressure effect and compression effect. The first is the negative pressure effect. When the generator is working, the piston in the cylinder will generate a certain pressure during the movement. When the piston moves to the bottom dead center, a negative pressure area is formed in the cylinder. At this time, the pressure in the booster pipe is higher than the negative pressure in the cylinder, which will cause air to be sucked into the cylinder from the booster pipe. Therefore, the booster pipe can use the negative pressure generated by the downward movement of the piston to increase the intake volume and improve the combustion efficiency. The second is the compression effect. When the piston moves to the top dead center, a compression area is formed in the cylinder. At this time, the air in the booster pipe will be pushed into the generator cylinder by the pressure generated by the piston movement. Due to the design of the booster pipe, the air will be pushed into the cylinder at a certain speed and pressure, forming a stronger pressure, so that the fuel is fully burned, thereby increasing the power output of the generator. The structure of the generator booster pipe is also an important factor affecting its effect. Generally speaking, the booster pipe consists of an air inlet, an air intake pipe, an intermediate pipe and an exhaust port. The air inlet is located outside the generator and is responsible for receiving air from the atmosphere. The air intake duct guides the air to the intermediate duct, and then enters the cylinder of the generator through the exhaust port. The design characteristics of the intermediate duct determine the supercharging effect of the supercharger. Generally, the intermediate duct is conical or trumpet-shaped, which can form a gradually expanding flow channel from narrow to wide. Such a design is conducive to increasing the intake speed, increasing the density of the air, and thus increasing the intake volume.

[0031] 2. The reference numerals in the drawings of the specification include: housing 1, second cavity 2, first cavity 3, filter unit 4, boost pipe 5, air outlet 6, air inlet 7, bending portion 8, connecting flange 9, exhaust gas connecting nozzle 10.

[0032] The embodiment is basically as shown in the attached Figure 1-Figure 8 As shown: A universal engine air filter comprises a shell 1, in which a filter unit 4 and a first cavity 3 for accommodating unfiltered air and a second cavity 2 for accommodating filtered air are provided on both sides of the filter unit 4; an air inlet 7 connected to the first cavity 3 and an air outlet 6 connected to the second cavity 2 are provided on the shell 1; a buffer cavity is provided in the second cavity 2 near the air inlet end.

[0033] A boost pipe 5 is provided in the second cavity 2. The boost pipe 5 is separated from the housing 1. The air inlet end of the boost pipe 5 is extended along a side away from the air inlet 7 and / or the air outlet 6. The air outlet end of the boost pipe 5 can be connected to an oil-gas mixing device. In this embodiment, the air inlet 7 and the air outlet 6 are provided on the same side of the housing 1, and the air inlet end of the boost pipe 5 is extended along a side away from the air inlet 7 and the air outlet 6.

[0034] Specifically, the boost pipe 5 is a flexible pipe, and includes an air inlet end, a diameter reducing section, a bending portion 8 and an air outlet end, wherein the axial center angle of the bending section is less than 90°, and the cross-sectional area of ​​the diameter reducing section is smaller than that of the air inlet end.

[0035] A connecting flange 9 is provided on one side of the outlet end near the outlet port 6, and the connecting flange 9 is sealed and connected to the outlet port 6. An exhaust gas connecting nozzle 10 is also provided near the connecting flange 9 at the outlet end, and the angle between the exhaust gas connecting nozzle 10 and the outlet end is an acute angle, that is, the angle between the exhaust gas connecting nozzle 10 and the outlet end is less than 90°.

[0036] This embodiment also discloses a universal engine, including an oil-gas mixing device and the above-mentioned air filter, wherein the connecting flange 9 is connected to the oil-gas mixing device via the air outlet 6 .

[0037] The specific implementation process is as follows: when the engine is working, air enters the first cavity 3 from the air inlet 7 of the air filter, and then enters the second cavity 2 after passing through the filter unit 4. The filtered air enters the boost pipe 5 from the air inlet end of the boost pipe 5, then flows along the boost pipe 5, and finally flows out from the air outlet end of the boost pipe 5 and enters the oil-gas mixing device.

[0038] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, which will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.

Claims

1. A general engine air filter, comprising a housing, a filter unit and a first cavity for accommodating unfiltered air and a second cavity for accommodating filtered air on both sides of the filter unit, an air inlet communicating with the first cavity and an air outlet communicating with the second cavity are provided on the housing, characterized in that: A boost pipe is provided in the second cavity, an air inlet end of the boost pipe is extended along a side away from the air inlet and / or the air outlet, and an air outlet end of the boost pipe can be connected to an oil-gas mixing device.

2. The universal engine air filter according to claim 1, characterized in that: The boost pipe and the shell are arranged separately.

3. The universal engine air filter according to claim 1 or 2, characterized in that: The boost pipe is provided with a bending section, and the air inlet end, the bending section and the air outlet end are integrally formed.

4. The universal engine air filter according to claim 3, characterized in that: The boost pipe is a flexible pipe.

5. The universal engine air filter according to claim 4, characterized in that: A connecting flange is provided on one side of the gas outlet end close to the gas outlet, and the connecting flange is sealed and connected to the gas outlet.

6. The universal engine air filter according to claim 5, characterized in that: The air outlet end is provided with a diameter-reducing section, and the cross-sectional area of ​​the diameter-reducing section is smaller than that of the air inlet end.

7. The universal engine air filter according to claim 6, characterized in that: A buffer cavity is provided in the second cavity on one side close to the air inlet end.

8. The universal engine air filter according to claim 7, characterized in that: The outlet end is also provided with an exhaust gas connection nozzle near the connection flange, and the included angle between the exhaust gas connection nozzle and the outlet end is an acute angle.

9. The universal engine air filter according to claim 8, characterized in that: The axis angle of the bending section is less than 90°.

10. A general engine, comprising an oil-gas mixing device, characterized in that: It also includes an air filter as described in any one of claims 1 to 9, wherein an air outlet end of the air filter is connected to the oil-gas mixing device.

11. The universal engine according to claim 10, characterized in that: The connecting flange is connected to the oil-gas mixing device through the air outlet.

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