Filter device of chain saw

Abstract

The utility model belongs to the technical field of chain saws, and relates to a filtering device of a chain saw, which comprises a crankcase component, a starter cover assembly is arranged on one side of the crankcase component, an upper cover component is arranged above the crankcase component, a closed filtering cavity is arranged in the upper cover component, a carburetor and a secondary air filter are arranged in the filtering cavity, and the carburetor and the secondary air filter are arranged in the filtering cavity. An air inlet is formed in the bottom of the filter cavity, an air outlet is formed in the side of the filter cavity, a primary air filter for separating the outside and the filter cavity is arranged at the air inlet, and the air outlet is communicated with an air suction channel on the starter cover assembly through an air suction port on the crankcase assembly. According to the filtering device of the small chain saw, air can be better filtered, and the service life of the chain saw is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of oil saw, relate to a filter device of oil saw. BACKGROUND

[0002] Oil saw is one of garden tools that uses gasoline engine as power, it is different from other garden tools, because it's working environment, will produce a large amount of sawdust and dust. According to the structural design principle, air is from the slot of starter cover, centrifuged through flywheel, enters the air filter through special channel, but part of sawdust and dust will enter the air filter with air after flywheel centrifugation, and part of small sawdust and dust will also enter the air filter, and after mixing with gasoline in carburetor, it is inhaled into cylinder through air inlet pipe. It can cause problems such as unstable idling, high speed instability, power shortage, and even cause machine cylinder pulling, affect the service life of machine.

[0003] Chinese utility model patent CN203161387U (publication date: 2013-08-28) discloses a gasoline engine air filter device, including starter cover, flywheel, flow guide cover, air filter, characterized in that: when air enters the starter cover, centrifuged through flywheel, by the special channel of flow guide cover to air filter, increase a filter screen device. The above-mentioned filter screen device is directly clamped on the special groove of the box, convenient to install, cover the flow guide cover and the starter cover, and screw on the screw. The air reaching the carburetor through the filter screen and the air filter can be basically guaranteed clean through the filter screen and the air filter, can filter most of the sawdust and dust, and the clean air can reduce the quality problems caused by impurities, effectively prolong the service life of the oil saw.

[0004] The working process of the above-mentioned air filter device is: air is sucked into the inside of the starter cover through the window of the starter cover, and is brought into the special channel of the flow guide cover by flywheel rotation, passes through the filter screen device, and then enters the special groove of the box, and is sucked into the carburetor through the air filter. When the flywheel rotates, negative pressure is formed in the flow guide cover, which affects the air entering the filter screen from the special channel of the flow guide cover. UTILITY MODEL CONTENTS

[0005] The utility model provides a filter device of oil saw in view of the deficiency of prior art, can better filter intake, prolong the service life of oil saw.

[0006] To solve the above technical problems, the purpose of the utility model is realized by the following technical scheme:

[0007] The application discloses a filtering device of a chain saw, which comprises a crankcase assembly, a starter cover assembly arranged on one side of the crankcase assembly, and an upper cover assembly arranged above the crankcase assembly, wherein a closed filtering cavity is arranged in the upper cover assembly, a carburetor and a secondary air filter are arranged in the filtering cavity, an air inlet is arranged at the bottom of the filtering cavity, an air outlet is arranged on the side of the filtering cavity, a primary air filter is arranged at the air inlet to separate the outside and the filtering cavity, and the air outlet is communicated with an air suction channel of the starter cover assembly through an air suction port of the crankcase assembly.

[0008] In the filtering device of the chain saw, the upper cover assembly comprises an air filter cover shell, an upper cover plate and a carburetor support arranged in sequence from top to bottom, and the filtering cavity is surrounded by the air filter cover shell, the upper cover plate and the carburetor support; the carburetor and the secondary air filter are fixed on the carburetor support.

[0009] In the filtering device of the chain saw, the air suction port and the air suction channel are arranged along the air flow direction, the starter cover assembly comprises a starter cover and a flow guide cover, the air suction channel is surrounded by the starter cover and the flow guide cover, and the air suction channel guides the air flow from the outer edge of the starter cover assembly to the middle part.

[0010] In the filtering device of the chain saw, the primary air filter comprises a filter frame, a filter screen is arranged in the filter frame, a filter side cover plate is arranged on one side of the filter frame, and the filter side cover plate covers the side opening of the carburetor support; preferably, a handle or a groove is arranged on the filter side cover plate to facilitate pushing and pulling.

[0011] In the filtering device of the chain saw, the primary air filter is detachably connected to the carburetor support, the primary air filter is arranged horizontally, a U-shaped sliding groove which is communicated with the side opening is arranged on the carburetor support, and the two sides of the filter frame and the end part opposite to the filter side cover plate are inserted into the U-shaped sliding groove.

[0012] In the filtering device of the chain saw, a downward clamping block is arranged at the bottom of the filter frame, the clamping block is connected to the inner wall of the side opening of the carburetor support to form a clamping structure, and a guide inclined surface is arranged on the clamping block.

[0013] In the filtering device of the chain saw, the filter frame is a flat plate structure, and the filter screen is a planar filter screen matched with the filter frame.

[0014] Alternatively, in the filtering device of the chain saw, the filter frame is a downwardly curved semicircular structure, the filter screen is an arc-shaped filter screen matched with the filter frame, and the semicircular structure refers to that the cross section of the filter frame is semicircular.

[0015] In the filtering device of the oil saw, the carburetor support is provided with a flameout switch and a damper pull rod, one end of the air filter cover shell is provided with an insertion block inserted into the upper cover plate, and the other end is locked with the upper cover plate through an air filter cover shell knob.

[0016] Alternatively, in the filtering device of the oil saw, a control support is clamped between the carburetor support and the upper cover plate, the control support is provided with a flameout switch and a fuel pump, the carburetor support is provided with a damper pull rod, one end of the air filter cover shell is provided with an insertion block inserted into the upper cover plate, and the other end is locked with the upper cover plate through an air filter cover shell knob.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a filtering device of oil saw, through one closed filter chamber setting carburetor and secondary air filter, setting air inlet in the bottom of filter chamber, side setting air outlet, utilize the negative pressure of flywheel formation to guide air to enter filter chamber from air inlet, then pass through the primary air filter of air inlet place and separate outside and filter chamber, the air of outside must pass through primary air filter and can enter the closed filter chamber only after filtering, the air inlet source of carburetor is limited to clean gas in filter chamber, cooperate and use secondary air filter, can obtain more clean air, to prolong the life of oil saw, the primary air filter of the utility model is easy to dismount, is convenient for washing, can prolong the service life of oil saw greatly. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the perspective drawing of the utility model embodiment 1;

[0020] Figure 2 It is the perspective drawing of the utility model embodiment 1 (remove air filter cover shell);

[0021] Figure 3 It is the assembly structure drawing of carburetor support and primary air filter of the utility model embodiment 1;

[0022] Figure 4 It is the perspective drawing of carburetor support of the utility model embodiment 1;

[0023] Figure 5 It is the perspective drawing of primary air filter of the utility model embodiment 1;

[0024] Figure 6 It is the perspective drawing of the utility model embodiment 1 (remove starter cover);

[0025] Figure 7 It is the perspective drawing of starter cover assembly of the utility model embodiment 1;

[0026] Figure 8is the perspective view of embodiment 2 of the utility model;

[0027] Figure 9 is the assembly structure diagram of carburetor support and primary air filter of embodiment 2 of the utility model;

[0028] Figure 10 is the perspective view of primary air filter of embodiment 2 of the utility model;

[0029] Reference signs: 1, crankcase assembly;2, starter cover assembly;3, filter cavity;4, air inlet;5, air outlet;6, primary air filter;7, air suction port;8, air suction channel;9, air filter cover;10, upper cover plate;11, carburetor support;12, starter cover;13, flow guide cover;14, filter frame;15, filter screen;16, filter side cover plate;17, side opening;18, U-shaped sliding groove;19, clamping block;20, flameout switch;21, damper pull rod;22, air filter cover knob;23, control support;24, oil pump. DETAILED DESCRIPTION

[0030] The utility model will be further described in the specific embodiment in combination with the drawings, referring to Figures 1-10 :

[0031] Embodiment 1

[0032] A kind of filtering device of oil saw, including crankcase assembly 1, the one side of the crankcase assembly 1 is provided with starter cover assembly 2, upper cover assembly is provided on crankcase assembly 1, the upper cover assembly includes air filter cover 9, upper cover plate 10 and carburetor support 11 that are sequentially arranged from top to bottom, the closed filter cavity 3 is enclosed between the air filter cover 9, upper cover plate 10 and carburetor support 11, the carburetor and secondary air filter (not drawn in the drawing) are arranged in the filter cavity 3 and fixed on carburetor support 11, the bottom of the filter cavity 3 is provided with air inlet 4, and air outlet 5 is provided in side, the primary air filter 6 that separates outside and filter cavity 3 is provided at air inlet 4, the air outlet 5 is communicated with the air suction channel 8 on the starter cover assembly 2 by the air suction port 7 on the crankcase assembly 1.

[0033] Compare with Figure 1 to attached Figure 2The filtering mode of the embodiment is that: when the flywheel rotates, negative pressure is formed, and the pressure of the air suction channel 8, the air suction port 7 and the air outlet 5 is lower than the pressure of the air inlet 4, the air outside is guided by the air pressure, enters the filtering cavity 3 from the air inlet 4, and then flows out through the air outlet 5, the air suction port 7 and the air suction channel 8 in turn. The filtering cavity 3 of the embodiment adopts a closed structure surrounded by the air filter cover shell 9, the upper cover plate 10 and the carburetor support 11. The air outside must enter from the bottom and pass through the filtering of the primary air filter 6 when entering the filtering cavity 3, so that the air in the filtering cavity 3 can be guaranteed to be pure air. The carburetor takes the gas in the filtering cavity 3 as the air inlet, and the gas in the filtering cavity 3 enters the carburetor after being filtered again by the secondary air filter.

[0034] Referring to the accompanying drawings Figure 6 and the accompanying drawings Figure 7 , the air suction port 7 and the air suction channel 8 are arranged along the air flow direction, and the arrangement direction in the embodiment is inclined downward. The starter cover assembly 2 includes the starter cover 12 and the flow guide cover 13. The air suction channel 8 is surrounded by the starter cover 12 and the flow guide cover 13, and the air suction channel 8 guides the air flow from the outer edge of the starter cover assembly 2 to the middle part.

[0035] Referring to the accompanying drawings Figure 3 to the accompanying drawings Figure 5 , the primary air filter 6 includes a filter frame 14, the filter frame 14 is provided with a filter screen 15, one side of the filter frame 14 is provided with a filter side cover plate 16, and the filter side cover plate 16 is arranged on the side opening 17 of the carburetor support 11. In the embodiment, in order to facilitate the pushing in or pulling out of the filter side cover plate 16, a recess for accommodating fingers is arranged on the filter side cover plate 16.

[0036] Further, the primary air filter 6 is detachably connected to the carburetor support 11, the primary air filter 6 is arranged horizontally, the carburetor support 11 is provided with a U-shaped sliding groove 18 which is in communication with the side opening 17, and the two sides of the filter frame 14 and the end opposite to the filter side cover plate 16 are inserted into the U-shaped sliding groove 18. Further, the bottom of the filter frame 14 is provided with a downward clamping block 19, the clamping block 19 is in abutting connection with the inner wall of the side opening 17 of the carburetor support 11 to form a clamping structure. Preferably, a guide inclined surface is arranged on the clamping block 19. When installing, the end of the primary air filter 6 is aligned with the side opening 17 of the carburetor support 11, the two sides of the filter frame 14 are aligned with the U-shaped sliding groove 18 and are slid in, after complete insertion, the clamping block 19 passes through the side opening 17 to form a fixed connection preventing the filter frame 14 from sliding out. When disassembling, the clamping block 19 can be pushed upward first, and then the filter frame 14 can be pulled out.

[0037] In the embodiment, the filter frame 14 is a flat plate structure, and the filter screen 15 is a flat filter screen 15 matched with the filter frame 14.

[0038] In the embodiment, the mounting structure of other functional components is that the carburetor support 11 is provided with the flameout switch 20 and the throttle lever 21, one end of the air filter cover 9 is provided with an insertion block inserted into the upper cover plate 10, and the other end is locked with the upper cover plate 10 through the air filter cover 9 knob; the structure and function of the flameout switch 20 and the throttle lever 21 are the same as those in the prior art.

[0039] Embodiment 2

[0040] In the embodiment, the mounting structure of other functional components is that the carburetor support 11 is provided with the flameout switch 20 and the throttle lever 21, one end of the air filter cover 9 is provided with an insertion block inserted into the upper cover plate 10, and the other end is locked with the upper cover plate 10 through the air filter cover 9 knob; the structure and function of the flameout switch 20 and the throttle lever 21 are the same as those in the prior art. Figure 8 Figure 10 In the embodiment, the mounting structure of other functional components is that the carburetor support 11 is provided with the flameout switch 20 and the throttle lever 21, one end of the air filter cover 9 is provided with an insertion block inserted into the upper cover plate 10, and the other end is locked with the upper cover plate 10 through the air filter cover 9 knob; the structure and function of the flameout switch 20 and the throttle lever 21 are the same as those in the prior art.

[0041] Specifically, the filter frame 14 is a downwardly curved semicircular structure, and the filter unit is an arc-shaped filter screen 15 matched with the filter frame 14; the semicircular structure refers to that the cross section of the filter frame 14 is semicircular. The primary air filter 6 in the embodiment can provide a larger filtering area, and thus can meet the use of smaller oil saws.

[0042] In addition, the control support 23 is clamped between the carburetor support 11 and the upper cover plate 10, the flameout switch 20 and the oil pump 24 are arranged on the control support 23, the throttle lever 21 is arranged on the carburetor support 11, one end of the air filter cover 9 is provided with an insertion block inserted into the upper cover plate 10, and the other end is locked with the upper cover plate 10 through the air filter cover 9 knob; the structure and function of the flameout switch 20, the oil pump 24 and the throttle lever 21 are the same as those in the prior art. The above structure can more conveniently arrange the functional components.

[0043] The above embodiments are only preferred embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.​

Claims

1. A filter device for a chain saw, comprising a crankcase assembly (1), a starter cover assembly (2) being provided on one side of the crankcase assembly (1), and an upper cover assembly being provided above the crankcase assembly (1), characterized in that: A closed filter chamber (3) is provided in the upper cover assembly, a carburetor and a secondary air filter are provided in the filter chamber (3), an air inlet (4) is provided at the bottom of the filter chamber (3), and an air outlet (5) is provided on the side, a primary air filter (6) is provided at the air inlet (4) for separating the outside world from the filter chamber (3), and the air outlet (5) is communicated with an air intake channel (8) on the starter cover assembly (2) through an air intake port (7) on the crankcase assembly (1).

2. The filter device for a chainsaw according to claim 1, characterized in that: The upper cover assembly comprises an air filter housing (9), an upper cover plate (10) and a carburetor bracket (11) which are arranged in sequence from top to bottom; the filter cavity is surrounded by the air filter housing (9), the upper cover plate (10) and the carburetor bracket (11); and the carburetor and the secondary air filter are fixed on the carburetor bracket (11).

3. The filter device for a chainsaw according to claim 1, characterized in that: The air intake port (7) and the air intake channel (8) are arranged along the air flow direction; the starter cover assembly (2) comprises a starter cover (12) and a deflector cover (13); the air intake channel (8) is surrounded by the starter cover (12) and the deflector cover (13); and the air intake channel (8) guides the air flow from the outer edge of the starter cover assembly (2) to the middle.

4. The filter device for a chainsaw according to claim 2, characterized in that: The primary air filter (6) comprises a filter frame (14), a filter screen (15) is arranged in the filter frame (14), a filter side cover (16) is arranged on one side of the filter frame (14), and the filter side cover (16) is covered on the side opening (17) of the carburetor bracket (11).

5. The filter device for a chainsaw according to claim 4, characterized in that: The primary air filter (6) is detachably connected to the carburetor bracket (11). The carburetor bracket (11) is provided with a U-shaped chute (18) communicating with the side opening (17). Both sides of the filter frame (14) and the end opposite to the filter side cover (16) are inserted into the U-shaped chute (18).

6. The filter device for a chainsaw according to claim 4, characterized in that: A downward-facing clamping block (19) is provided at the bottom of the filter frame (14), and the clamping block (19) is in contact with the inner wall of the side opening (17) of the carburetor bracket (11) to form a clamping structure.

7. The filter device for a chainsaw according to claim 4, characterized in that: The filter frame (14) is a flat plate structure, and the filter screen (15) is a flat filter screen adapted to the filter frame (14).

8. The filter device for a chainsaw according to claim 4, characterized in that: The filter frame (14) is a downwardly curved semicircular structure, and the filter screen (15) is an arc-shaped filter screen adapted to the filter frame (14).

9. The filter device for a chainsaw according to claim 2, characterized in that: The carburetor bracket (11) is provided with a flameout switch (20) and a damper lever (21); one end of the air filter cover (9) is provided with an insert block inserted into the upper cover (10); the other end is locked with the upper cover (10) via an air filter cover knob (22).

10. The filter device for a chainsaw according to claim 2, characterized in that: A control bracket (23) is provided between the carburetor bracket (11) and the upper cover (10), and a flameout switch (20) and an oil pump (24) are provided on the control bracket (23). A throttle lever (21) is provided on the carburetor bracket (11). One end of the air filter cover (9) is provided with an insert block inserted into the upper cover (10), and the other end is locked with the upper cover (10) through an air filter cover knob (22).

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