Sealed dust collection wind scooper for hand saw

Abstract

The utility model discloses a sealing dust collection wind scooper of a hand saw, which comprises a shell, a dust outlet is arranged above the rear end of the shell, an air inlet is arranged on the side face of the shell, and the air inlet is arranged on the other side of the shell relative to a saw blade cutting motor. The distance between the inner side of the rear end of the shell and the periphery of the saw blade is more than two times that between the inner side of the upper edge of the shell and the periphery of the saw blade, the distance between the inner side of the rear end of the shell and the periphery of the saw blade is larger than that between the inner side of the front end of the shell and the periphery of the saw blade, and the distance between the two sides in front of an inlet of the dust outlet is more than three times that between the inner side of the upper edge of the shell and the periphery of the saw blade. The peripheral distance between the portion, from the dust outlet to the front end of the shell, of the inner side of the shell and the periphery of the saw blade is increased in the rotating direction of the saw blade. According to the utility model, dust generated by cutting can better enter the range of the dust outlet; the inner space structure of the shell is reasonable in design; the air inlet sucks air flow through negative pressure, and the dust collection and removal effects are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power tools, relates to an improvement of a dust removal structure of a saw blade guard, and particularly relates to a sealed dust suction air guide cover for a hand saw. Background Art

[0002] A hand-held electric cutting machine is also called a hand saw or a hand-held cutting saw, etc. Due to its low price, convenient carrying, good operability and other advantages, hand saws are widely used in industries such as decoration and fitment. Similar to electric tools for cutting materials such as table saws and miter saws, a large amount of dust and sawdust will be generated during cutting. Without protective measures for collecting dust and sawdust, a large amount of dust will spread, affecting the health and safety of operators and users, and it is not easy to clean.

[0003] During operation, the front teeth of the saw blade first contact the material, and the saw blade is driven by a cutting motor to rotate, which will form an air flow around the saw blade. The generated dust is carried by the air flow along the rotation direction of the cutting saw blade. Therefore, there are also hand saws with a guard outside the saw blade, and dust is collected and removed through a dust suction port.

[0004] However, since the lower opening part of the existing hand saw guard is not hermetically connected to the bottom plate, dust and sawdust are likely to overflow from the gap when rotating with the air flow; in addition, the distance between the inner side of the guard and the outer periphery of the saw blade is not reasonably set, which is likely to generate turbulence, making it difficult for dust and sawdust to enter the coverage range of the dust outlet; when the saw blade rotates and sucks air, it can only enter from the lower port of the guard. Coupled with the shielding of the lower port of the guard by the cutting material, the resistance is large and the suction air flow is insufficient. The mutual influence and superposition of the above various reasons result in many deficiencies in the dust removal effect of the existing guard for hand saws.

[0005] Such as the "a hand-held cutting device for building decoration" disclosed in Chinese Patent (authorization announcement number CN213766515U). The cutting device includes a cutting saw blade, an anti-dust cover is sleeved outside the upper part of the cutting saw blade, a dust collection cover is arranged outside the lower part of the cutting saw blade, a connecting plate is arranged between the tail end of the dust collection cover and the tail end of the anti-dust cover, and the thickness of the connecting plate is less than the thickness of the cutting saw blade. In the utility model, an anti-dust cover and a dust collection cover are sleeved outside the cutting saw blade. The anti-dust cover hinders the splashing of dust above the plate, and the dust collection cover collects the dust below the plate, effectively ensuring a good working environment. At the same time, the anti-dust cover and the dust collection cover also play a protective role for the cutting saw blade, preventing the occurrence of accidental injury caused by misoperation.

[0006] For the above-mentioned disclosed cutting device and the existing hand saw guard, most of the dust still cannot enter the dust suction port range and will fall from the lower port of the guard. Therefore, there is still a need for improvement in the dust collection and dust removal effects of existing hand saw-like power tools. Content of the Utility Model

[0007] The purpose of the present utility model is to provide a sealed dust suction and air guiding cover for a hand saw, which is used to solve the problem that the existing hand saw has poor dust collection and dust removal effects.

[0008] In order to achieve the purpose of the present utility model, the following technical solutions are adopted:

[0009] The sealed dust suction and air guiding cover for a hand saw includes a housing for surrounding the outer periphery of the upper and middle parts of the saw blade. The housing is a cavity structure with an open lower part. An air outlet is opened above the rear end of the housing, and an air inlet is opened on the side of the housing. The air inlet is located on the other side of the housing relative to the saw blade cutting motor. The distance between the inner side of the rear end of the housing and the outer periphery of the saw blade is more than twice the distance between the inner side of the upper edge of the housing and the outer periphery of the saw blade. The distance between the inner side of the rear end of the housing and the outer periphery of the saw blade is greater than the distance between the inner side of the front end of the housing and the outer periphery of the saw blade. The distance between the two sides in front of the entrance of the air outlet is more than three times the distance between the inner side of the upper edge of the housing and the outer periphery of the saw blade. The outer periphery distance between the inner side of the housing and the outer periphery of the saw blade in the part from the air outlet to the front end of the housing increases along the rotation direction of the saw blade. When the saw blade works, air flow is sucked in from the air inlet by the negative pressure formed in the central area of the saw blade, and the dust-containing chip air flow is driven to be discharged from the air outlet.

[0010] In order to further achieve the purpose of the present utility model, the following technical solutions can also be adopted:

[0011] For the sealed dust suction and air guiding cover for a hand saw as described above, the air inlet is a plurality of air holes spacedly opened on the housing, and the air holes are located in the central area of the saw blade.

[0012] For the sealed dust suction and air guiding cover for a hand saw as described above, a flow disturbing rib strip facing the outer periphery of the saw blade is provided at the top of the inner side of the housing, and the flow disturbing rib strip is located on the front side of the air outlet of the housing.

[0013] For the sealed dust suction and air guiding cover for a hand saw as described above, a plurality of the flow disturbing rib strips are spacedly arranged. The upper ends of the flow disturbing rib strips are fixed to the inner wall of the housing, and the lower ends of the flow disturbing rib strips are close to the outer periphery of the saw blade.

[0014] For the sealed dust suction and air guiding cover for a hand saw as described above, the lower end of the housing is hermetically connected to the bottom plate of the hand saw, and the bottom plate of the hand saw is provided with a saw blade opening that matches the open lower part of the housing.

[0015] For the sealed dust suction and air guiding cover for a hand saw as described above, the housing is a transparent protective cover made of plastic.

[0016] For the sealed dust suction and air guiding cover for a hand saw as described above, the outer shapes of the rear end of the housing and the part from the air outlet to the front end of the housing are arc-shaped curves.

[0017] The advantages of the present utility model are as follows:

[0018] 1. The air inlet of the present utility model is located at the center of the saw blade. Since a negative pressure is generated in the central area when the saw blade rotates, the air inlet resistance can be reduced, the air flow rate can be ensured, the air flow speed inside the housing can be increased, so that the dust and chips generated by cutting can better enter the range of the dust outlet, thereby improving the dust collection and dust removal effects; there will also be no risk of occlusion.

[0019] 2. The distance between the inner side of the housing of the present utility model and the outer periphery of the saw blade is reasonably designed. The distance between the inner side of the rear end of the housing and the outer periphery of the saw blade is relatively large, which is conducive to the dust and chip air flow entering the range of the dust outlet; the distance between the inner side of the upper part of the housing in front of the dust outlet and the outer periphery of the saw blade is relatively small, which can block the dust and chip air flow. In addition, the distance between the inner side of the housing from the dust outlet to the front end of the housing and the outer periphery of the saw blade gradually increases along the rotation direction of the saw blade, reducing the resistance of the dust and chip air flow at the front end rotating with the saw blade and enhancing the dust suction effect.

[0020] 3. The inner side of the top of the housing is provided with spoiler ribs facing the outer periphery of the saw blade. The spoiler ribs are located on the front side of the dust outlet of the housing, and the edge of the spoiler ribs is close to the edge of the saw blade. Therefore, the dust and chip air flow can be further blocked from passing over the dust outlet, thereby increasing the air flow pressure at the dust outlet and facilitating the derivation of dust and chips from the dust outlet.

[0021] 4. The lower end of the housing of the present utility model is hermetically connected to the bottom plate of the hand saw, so that dust and chips can be prevented from overflowing from the gap at the connection. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art.

[0023] Figure 1 is a perspective view of the present utility model;

[0024] Figure 2 is Figure 1 a side view of (wherein the housing is sectioned).

[0025] Reference Signs:

[0026] 1 - housing, 2 - saw blade, 3 - bottom plate, 4 - dust outlet, 5 - air inlet, 6 - spoiler ribs;

[0027] A - the distance between the inner side of the upper edge of the housing and the outer periphery of the saw blade;

[0028] B - the distance between the inner side of the front end of the housing and the outer periphery of the saw blade;

[0029] C - the distance between the inner side of the rear end of the housing and the outer periphery of the saw blade;

[0030] D - the distance between the two sides in front of the entrance of the dust outlet. Detailed Embodiments

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model.

[0032] In the description of the embodiments of the present utility model, unless otherwise clearly defined, terms such as "arrangement", "installation", and "connection" should be understood in a broad sense. Those skilled in the relevant technical fields can reasonably determine the specific meanings of the above terms in the present utility model in combination with the specific content of the technical solutions.

[0033] As Figure 1 、 Figure 2 As shown, a sealed dust suction and air guiding cover for a hand saw disclosed in this embodiment includes a housing 1 for surrounding the outer periphery of the upper middle part of the saw blade 2. The housing 1 has a cavity structure with an open lower part. The bottom plate 3 of the hand saw is provided with a saw blade opening for mating with the lower part of the housing 1. During installation, the lower part of the housing 1 is directly fixed in cooperation with the bottom plate 3 of the hand saw. Therefore, in order to prevent dust and debris from overflowing from the gap at the connection, the lower end of the housing 1 and the bottom plate 3 are hermetically connected using a rubber strip or a gasket, etc.

[0034] An air outlet 4 is opened above the rear end of the housing 1. The air outlet 4 is arranged in the cutting tangent direction of the saw blade 2; an air inlet 5 is opened on the side of the housing 1. The air inlet 5 is arranged on the other side of the housing 1 relative to the cutting motor of the saw blade 2. When the saw blade 2 is working, the negative pressure formed in the central area by the saw blade 2 is used to suck in air flow from the air inlet 5 and drive the air flow containing dust and debris to be discharged from the air outlet 4.

[0035] The distance between the inner side of the rear end of the housing 1 and the outer periphery of the saw blade 2 is more than twice the distance between the inner side of the upper edge of the housing 1 and the outer periphery of the saw blade 2. The distance between the inner side of the rear end of the housing 1 and the outer periphery of the saw blade 2 is greater than the distance between the inner side of the front end of the housing 1 and the outer periphery of the saw blade 2. The distance between the two sides in front of the entrance of the air outlet 4 is more than three times the distance between the inner side of the upper edge of the housing 1 and the outer periphery of the saw blade 2

[0036] Specifically, as Figure 2 shown, A is the distance between the inner side of the upper edge of the housing 1 and the outer periphery of the saw blade 2; B is the distance between the inner side of the front end of the housing 1 and the outer periphery of the saw blade 2; C is the distance between the inner side of the rear end of the housing 1 and the outer periphery of the saw blade 2; D is the distance between the two sides in front of the entrance of the air outlet 4. The outer peripheral distance between the inner side of the housing 1 from the air outlet 4 to the front end of the housing 1 and the outer periphery of the saw blade 2 increases along the rotation direction of the saw blade 2.

[0037] At the same time, to further reduce the air flow resistance, the outer shapes of the rear end of the housing 1 and the part from the air outlet 4 to the front end of the housing 1 are in the shape of an arc curve.

[0038] The distance between the inner side of the housing 1 of the present utility model and the outer periphery of the saw blade 2 is reasonably designed. The distance between the inner side of the rear end of the housing 1 and the outer periphery of the saw blade 2 is relatively large, which is conducive to the dust and debris airflow entering the range of the dust outlet 4; the distance between the upper inner side of the housing 1 in front of the dust outlet 4 and the outer periphery of the saw blade 2 is relatively small, which can block the dust and debris airflow. In addition, the distance between the inner side of the housing 1 from the dust outlet 4 to the front end of the housing 1 and the outer periphery of the outer periphery of the saw blade 2 gradually increases along the rotation direction of the saw blade 2, reducing the resistance of the dust and debris airflow at the front end rotating with the saw blade 2 and enhancing the dust suction effect. Compared with the existing hand saw, the dust suction efficiency of the present utility model can be increased by more than 30%.

[0039] Continue to refer to Figure 2 As shown, the air inlet 5 is a plurality of air holes spaced apart on the housing 1, and the air holes are located in the central area of the saw blade 2. Since a negative pressure is generated in the central area when the saw blade 2 rotates, the air inlet resistance can be reduced, the air flow rate can be ensured, the air flow velocity inside the housing 1 can be increased, so that the dust and debris generated by cutting can better enter the range of the dust outlet 4, thereby improving the dust collection and dust removal effects; there is also no risk of blockage.

[0040] The total area of the air inlet 5 can be set with reference to the rotational speed and diameter parameters of the saw blade 2. In addition, since the air inlet 5 of this embodiment is located in the central negative pressure area of the saw blade 2, the area can be set relatively small to ensure the strength of the housing 1.

[0041] On the inner top of the housing 1, there are spoiler ribs 6 facing the outer periphery of the saw blade 2. The spoiler ribs 6 are located on the front side of the dust outlet 4 of the housing 1. In this embodiment, there are 2 spoiler ribs 6 arranged at intervals. The upper ends of the spoiler ribs 6 are fixed to the inner wall of the housing 1, and the lower ends of the spoiler ribs 6 are close to the outer periphery of the saw blade 2. The setting of the spoiler ribs 6 can further block the dust and debris airflow from passing over the dust outlet 4, thereby increasing the air flow pressure at the dust outlet 4 and facilitating the derivation of dust and debris from the dust outlet.

[0042] In order to facilitate observing the working condition of the saw blade 2 and the internal condition of the air guide cover, the housing 1 in this embodiment is a transparent protective cover made of plastic. A connector is installed on the dust outlet 4 to facilitate connection with ports such as a dust collection bag or a vacuum cleaner.

[0043] The technical content not described in detail in the present utility model is well-known technology.

Claims

1. A sealed dust collecting and air guiding cover for a portable saw, comprising a shell for surrounding the upper periphery of a saw blade, wherein the shell is a cavity structure with an open lower portion, and is characterized in that: A dust outlet is provided above the rear end of the shell, and an air inlet is provided on the side of the shell, and the air inlet is arranged on the other side of the shell relative to the saw blade cutting motor; the distance between the inner side of the rear end of the shell and the outer periphery of the saw blade is more than twice the distance between the inner side of the upper edge of the shell and the outer periphery of the saw blade, the distance between the inner side of the rear end of the shell and the outer periphery of the saw blade is greater than the distance between the inner side of the front end of the shell and the outer periphery of the saw blade, and the distance between the two sides in front of the dust outlet entrance is more than three times the distance between the inner side of the upper edge of the shell and the outer periphery of the saw blade; the outer peripheral distance between the inner side of the shell from the dust outlet to the front end of the shell and the outer periphery of the saw blade increases along the direction of the saw blade; when the saw blade is working, the negative pressure formed by the saw blade in the central area is used to suck in air from the air inlet and drive the dust-containing airflow to be discharged from the dust outlet.

2. The sealed dust collecting and air guiding cover of the portable saw according to claim 1, characterized in that: The air inlet is a plurality of air holes spaced apart on the housing, and the air holes are located in the central area of ​​the saw blade.

3. The sealed dust collecting and air guiding cover of the portable saw according to claim 1, characterized in that: The top of the inner side of the shell is provided with a spoiler rib facing the outer periphery of the saw blade, and the spoiler rib is located in front of the dust outlet of the shell.

4. The sealed dust collecting and air guiding cover of the portable saw according to claim 3, characterized in that: A plurality of spoiler ribs are arranged at intervals, the upper ends of the spoiler ribs are fixed to the inner wall of the shell, and the lower ends of the spoiler ribs are close to the outer periphery of the saw blade.

5. The sealed dust collecting and air guiding cover of the portable saw according to claim 1, characterized in that: The lower end of the shell is sealed and connected with the bottom plate of the portable saw, and the bottom plate of the portable saw is provided with a saw blade opening matched with the opening of the lower part of the shell.

6. The sealed dust collecting and air guiding cover of the portable saw according to claim 1, characterized in that: The shell is a transparent shield made of plastic.

7. The sealed dust collecting and air guiding cover of the portable saw according to claim 1, characterized in that: The rear end of the shell and the outer shape from the dust outlet to the front end of the shell are in an arc curve shape.

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