A cap-type air cleaner

Abstract

The utility model discloses a cap type air filter, including primary filter and secondary filter unit, and primary filter is by upper cover, cyclone assembly constitutes, and primary filter upper cover is established on cyclone assembly, and primary filter is equipped with air inlet, and air inlet is equipped with cyclone vane, and the separation cavity is formed between primary filter upper cover and cyclone assembly, and the connection cavity is formed to the air inlet of cyclone assembly and secondary filter unit, and the dust discharge notch is arranged on the top side surface of primary filter upper cover, and the rotation direction of dust discharge notch and cyclone vane is coaxial and opposite arrangement, and the lower part of separation cavity is communicated with connection cavity, and secondary filter unit is connected with primary filter through screw.

Description

Technical Field

[0001] This utility model relates to the field of air filters for internal combustion engines, specifically to the field of air filters for small single-cylinder gasoline / diesel engines. Background Technology

[0002] Air filters equipped with cap-type cyclone pre-filters have a certain pre-filtration dust removal efficiency, but they also have problems such as high original resistance of the cap-type cyclone pre-filter and low pre-filtration dust removal efficiency, and there is still potential for improvement. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this utility model provides a cap-type air filter. By analyzing the entire process of dusty air passing through the cap-type cyclone pre-filter—from intake to cyclone to separation to dust removal to exhaust—this invention explores the structural design and functional interactions of the cap-type cyclone pre-filter and their impact on the original resistance and dust removal efficiency of the pre-filter. The structure of the cap-type cyclone pre-filter is improved and redesigned to enhance dust removal efficiency and reduce original resistance, ultimately reducing the frequency of filter element replacement and extending the maintenance cycle and service life of the air filter.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The cap-type cyclone pre-filter consists of a pre-filter cover and a cyclone assembly. The pre-filter cover is mounted on the cyclone assembly. The pre-filter has an air inlet with swirl vanes. A dust discharge slit is opened on the top side of the pre-filter cover. The dust discharge slit is coaxially aligned with the swirl vanes. The cap-type cyclone pre-filter is connected to the secondary filtration unit.

[0006] Furthermore, a screw is embedded in the top of the primary filter, and the upper cover of the primary filter has mounting holes for connection and fixation with screws and nuts.

[0007] Dust-laden air, under the negative pressure of engine intake, enters through the intake port and forms a high-speed rotating airflow through the swirl vanes. The airflow spirals upward along the inner side of the primary filter cover. The swirl generates centrifugal force to separate the air and dust. The dust is automatically and continuously discharged from the primary filter through the dust outlet during rotation. The relatively clean air after separation flows downward through the exhaust connection chamber and enters the secondary filtration unit.

[0008] The beneficial effects of this utility model include: compact structure, good primary filtration and dust removal effect, low initial resistance. In this embodiment, the primary filtration efficiency is greater than 76% at rated air flow, and the initial resistance of the air filter assembly is less than 1.75 kPa. This can reduce the replacement frequency of the air filter assembly filter element and extend the maintenance cycle and service life. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model;

[0010] Figure 2 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0011] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0012] One such Figure 1-2 The illustrated cap-type air filter includes a pre-filter 1 and a secondary filter unit 3. A pre-filter cover 2 is mounted on a cyclone assembly 16. A screw 4 is embedded in the top of the pre-filter 1. The pre-filter cover 2 has mounting holes for connection with the screw and is then secured with a nut. The pre-filter 1 has an air inlet 11 with multiple swirl vanes 12 arranged in a ring around the outer periphery of the cyclone assembly 16. The air inlet is located at the lower end of the swirl vanes. An air intake separation chamber 13 is formed between the cyclone assembly 16 and the pre-filter cover 2. Dust-laden air passes through the swirl vanes and forms a high-speed rotating airflow within the separation chamber. A connecting chamber is formed between the cyclone assembly and the air inlet of the secondary filter unit for connecting the secondary filter unit. The top side of the primary filter cover 2 has three dust discharge slits 15, which are directly opposite to the rotation direction of the swirl vanes. When air enters from the swirl vanes, due to the centrifugal force generated by the high-speed rotating airflow, the dust moves in a spiral motion along the inner wall of the primary filter cover and is continuously and automatically discharged from the dust discharge slits.

[0013] The lower part of the separation chamber 13 is connected to the connecting chamber 14, and the air after primary filtration and dust removal enters the connecting chamber. The secondary filtration unit is connected to the primary filter 1.

[0014] The upper cover 2 of the primary filter is a cone shape with a smaller top and a larger bottom. The angle between the side wall of the upper cover 2 and the axis is between 5° and 10°. It plays a role in constricting and strengthening the high-speed airflow that is spiraling inside the upper cover, which has a certain impact on the dust removal efficiency. The dust removal efficiency decreases when the angle is less than 5° and greater than 10°. The dust removal efficiency is 71-81% when the angle is 5°-10°. In this preferred embodiment, 8° is selected.

[0015] The tilt angle of the swirl blades was calculated, analyzed, and verified experimentally. The tilt angle was set between 25° and 36°. In this embodiment, as the tilt angle increased from 25° to 36°, the original resistance gradually decreased from 0.62 kPa to 0.34 kPa, and the dust removal efficiency gradually decreased from 82% to 66%. Taking into account both dust removal efficiency and original resistance, the preferred embodiment uses a swirl blade tilt angle of 30°.

[0016] like Figure 2 The height from the air outlet plane of the swirl vane to the bottom plane of the dust discharge port is selected as 30%-40% of the outer diameter of the swirl vane. As the height increases, the dust discharge efficiency gradually increases. Due to the installation space limitation of the height of the pre-filter assembly, 35% is selected in this embodiment.

[0017] In this embodiment, as Figure 1 The cut length of the dust discharge port should be 1.1 times the height of the swirl blades. The height of the swirl blades determines the height of the ash ring formed at the bottom of the dust discharge port by the rotating airflow. If the cut length is too small, the dust discharge efficiency will be reduced. If the cut length is too large and exceeds the height of the ash ring, the dust discharge efficiency will be reduced or even no dust will be discharged, and the dust discharge port will become an air inlet.

[0018] like Figure 2 The top of the cyclone assembly 16 is sealed to the inner surface of the upper cover 2 under the pressure of the screw 4. The cylinder of the cyclone assembly 16 acts as a dust-blocking ring. The width of the cylinder to the dust outlet is selected as 1-1.4 times the width of the air inlet. If the width is smaller, the original resistance will be reduced; if the width is larger, the dust discharge efficiency will be reduced. In this embodiment, the width is selected as 1.2 times the width of the air inlet.

[0019] The secondary filtration unit 3 includes an air guide pipe 5, a housing 6, an oil bath 7, a support 8, and an oil-dispersing plate 9. The air guide pipe 5 is coaxially arranged inside the housing 6, with its upper end extending out of the top surface of the housing 6 and into the connecting cavity 14 to a predetermined height. The oil bath 7 is connected to the lower end of the housing 6, the support 8 is located at the upper part of the oil bath 7, and the support 8 is connected to the lower end of the air guide pipe 5. The oil-dispersing plate 9 is placed at the inner bottom of the oil bath 7.

[0020] A filter sponge 17 is filled between the bottom of the air outlet pipe and the support 8. The air passing through the air duct 5 first enters the oil bath 7 and impacts the oil. The dust in the air combines with the oil and is adsorbed by the oil. After the air comes into contact with the oil, it reverses and passes through the filter sponge 17, achieving the purpose of secondary filtration.

[0021] The technical solutions provided by the embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of this utility model. The description of the above embodiments is only for helping to understand the principles of the embodiments of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A cap-type air filter, characterized in that: The filter includes a primary filter (1) and a secondary filter unit (3). The primary filter (1) consists of a primary filter cover (2) and a cyclone assembly (16). The primary filter cover (2) covers the cyclone assembly (16). The primary filter (1) is provided with an air inlet (11). The air inlet (11) is provided with swirl vanes (12). Several dust discharge cuts (15) are opened on the top side of the primary filter cover (2). The dust discharge cuts (15) and the swirl vanes (12) are coaxially aligned and opposite to each other. The primary filter (1) is connected to the secondary filter unit.

2. The cap-type air filter according to claim 1, characterized in that: The top of the primary filter (1) is fitted with a screw (4), and the upper cover (2) of the primary filter has a mounting hole that is connected to the screw and then fixed by a nut.

Images