TWI414397B - Power tools for negative pressure dust collection - Google Patents

Description

Negative pressure dust collecting structure of power tool

A negative pressure dust collecting structure of a power tool, in particular, a dust collecting structure having an improved flow guiding line.

Small power tools (including pneumatic or electric) are popular because of their small size, low price and low energy consumption, and the power tools include a variety of variations, such as grinders, drills, pneumatic (electric) wrenches. And so on. Among them, some types of power tools are used to perform drilling or grinding, and a large amount of dust is generated in the workplace during operation, which has a great impact on the health of the staff. Therefore, in order to improve the problem of dust scattering, the manufacturer has improved the structure of the power tool. For the improvement of this aspect, refer to the Republic of China Patent Certificate M349818, "Structural Structure Improvement", in which one side of the grinder housing has a grip, The grip is provided with an input portion (121) for supplying electric power or high pressure gas required for the operation of the power tool, and an output portion for grinding the dust generated on the surface of the preset workpiece. , impurities and water vapor are discharged. According to the description of the foregoing and the fifth figure, the output unit is an exhaust line, and waste materials such as dust are discharged by the suction air flow. Because of the problem of dust floating around during work, many power tools have similar structural features, such as the Republic of China Patent Certificate No. M245007, I260255, and Announcement No. 493485.

However, in these prior patents, although there is a function of sucking away dust, but there is a common deficiency, the M349818 mentioned in the previous paragraph is taken as an example, and the exhaust line is visible in the fifth figure of the previous case. An opening is formed in the cover around the polishing pad body (3), and the opening is connected to the output portion (122), that is, connected to an exhaust pipe, and the exhaust pipe is connected to a suction device to make the output The part generates a suction force to suck dust and impurities in the cover body into the output portion. However, the shape and position of the opening is such that the suction force in front of the opening is strong, but the suction force slightly deviating from the opening is significantly weakened. And because the edge of the opening and the cover body have a turning angle of more than 70 degrees, the gas generates a large power loss at the corner, causing the suction on both sides of the opening to be significantly weakened. In combination with the above-mentioned shortcomings, the inhalation airflow intensity in the cover body is extremely uneven, so that part of the dust is not sucked into the exhaust pipe and scattered outside the cover body; or the suction device connected to the exhaust pipe is greatly consumed. Power to achieve the desired effect, but obviously caused a waste of energy.

In view of the lack of efficiency of the conventional dust suction structure, the object of the present invention is to provide an improved dust collecting structure having a dust collecting pipe with better efficiency and provided with the dust collecting pipe. The road-matched dust collecting hood improves the range and efficiency of dust extraction.

The present invention is a negative pressure dust collecting structure of a power tool, the power tool is connected to an application tool and operates in a working space surrounded by a dust collecting cover, wherein the dust collecting cover has at least one diversion opening through a negative pressure reinforcing conduit and a The air flow conduit is in communication, and wherein the negative pressure enhancement conduit has a negative pressure enhancement space communicating with the flow opening, and the negative pressure enhancement space has a tapered shape from the flow opening toward the airflow conduit The cross-sectional area is used to enhance the suction of the negative pressure enhancing conduit to collect dust from the dust collecting hood. Further The open end edge of the negative pressure reinforcing space can match the shape of the inner edge of the wall of the dust collecting cover, so that the air suction can cover a larger range.

Since the negative pressure enhancing space has a tapered cross-sectional area toward the confluence space, the suction force is increased. And due to the expansion of the coverage of the airflow suction, the suction force of the negative pressure airflow in the dust collecting hood is more uniform, so as to improve the problem that the suction force in the dust collecting hood is too large and the power consumption is excessive.

1‧‧‧Power Tools

11‧‧‧Output Department

2‧‧‧Airflow line

3‧‧‧Negative pressure enhanced catheter

31‧‧‧Connecting Department

311‧‧‧ Confluence space

32‧‧‧ Negative Pressure Enhancement Department

321‧‧‧Negative pressure enhancement space

33‧‧‧ conformal opening

34‧‧‧ compartment

4‧‧‧ dust cover

41‧‧‧ wall

42‧‧‧ Diversion opening

5‧‧‧ grinding wheel

Figure 1 is an exploded view (I) of the embodiment of the present invention.

Figure 2 is an exploded view (2) of the embodiment of the present invention.

Figure 3 is a cross-sectional view (I) of the vacuum enhanced conduit.

Figure 4 is a cross-sectional view (2) of the vacuum enhanced conduit.

For a preferred embodiment of the present invention, please refer to FIG. 1, FIG. 2, FIG. 3 and FIG. 4. The present invention is a negative pressure dust collecting structure of a power tool. FIG. 1 and FIG. 2 show a main body of a power tool 1 . One end has an output portion 11 for connecting an application tool, and the application tool is operated in a working space surrounded by a dust collecting cover 4. Wherein the power tool 1 can be a pneumatic or electric mechanism, and the worker can hold the power tool 1 and control whether the output portion 11 of the power tool 1 operates as a technique well known to those skilled in the art, the power tool 1 The internal structure is not the case The focus of the request, so the detailed structure and operation of the power tool 1 will not be described in this case. The dust collecting hood 4 is connected to the power tool 1. The dust collecting hood 4 has a wall surface 41 surrounding the working space, and the wall surface 41 has at least one flow guiding opening 42 connected to a negative pressure reinforcing conduit 3, and transmits the negative pressure. The pressure-enhancing conduit 3 is in communication with a gas flow line 2 which is connected to a source of negative pressure. Here, the relationship between airflow and pressure is first explained. In theory, the air will stop flowing when the air pressure is balanced, and the pressure will make the air flow to a relatively low pressure when the pressure is unbalanced. Therefore, if the air and dust in the dust collecting cover 4 are to be collected, a pressure source lower than the dust collecting cover 4 must be provided, so the word "negative pressure" is used to indicate that the negative pressure reinforcing pipe 3 has a relatively lower dust collecting capacity. The pressure of the cover 4 causes the air in the dust collecting hood 4 to flow toward the negative pressure reinforcing conduit 3. The source of the negative pressure is to generate a concentrated dust flow, and the air flow is caused by mechanical operation, thereby generating a pressure change, and the dust located in the working space is sucked through the direction of the air flow, and the negative pressure source is implemented. The manner is well known to those skilled in the art and will not be described again. The negative pressure enhancing conduit 3 includes at least one conformal opening 33, a connecting portion 31, and a negative pressure reinforcing portion 32 between the conforming opening 33 and the connecting portion 31. The connecting portion 31 has a confluence space 311 (shown in FIG. 3 and FIG. 4 ) connected to the air flow conduit 2 . The cross-sectional area of the confluence space 311 is smaller than the inner cross-sectional area of the air flow conduit 2 , and the negative pressure enhancement portion 32 . One end of the connection portion 31 is in contact with the connection portion 31, and the negative pressure enhancement portion 32 has a negative pressure enhancement space 321 (shown in FIGS. 3 and 4) communicating with the confluence space 311 (shown in FIGS. 3 and 4). The conformal opening 33 is located at the other end of the negative pressure reinforcing portion 32 and communicates with the negative pressure reinforcing space 321 . The negative pressure enhancing space 321 has a tapered cross-sectional area from the flow guiding opening 42 toward the air flow conduit 2 to enhance the suction force of the negative pressure enhancing conduit 3 to collect dust from the dust collecting cover 4. More specifically, the conformal opening 33 is connected to the diversion opening 42 of the dust collecting hood 4, and the number of the diversion openings 42 is connected to each other corresponding to the compliant opening 33, so that the negative pressure enhancing guide The air flow conducted by the tube 3 can suck the dust located in the dust collecting hood 4. Therefore, the negative pressure enhancing conduit 3 includes a feature of the following airflow path: the cross-sectional area of the confluence space 311 is smaller than the cross-sectional area of the airflow conduit 2, and the negative pressure enhancement space 321 is from the conformal opening 33 toward the confluence The direction of the space 311 has a tapered cross-sectional area. Since the negative pressure enhancement space 321 has a tapered cross-sectional area, and the cross-sectional area of the confluence space 311 is smaller than the cross-sectional area of the air flow conduit 2, the flow rate of the air through the negative pressure enhancement conduit 3 is accelerated to achieve flow balance. This increases the suction of the air flow. Further, the conformal opening 33 at the end of the negative pressure reinforcing space 321 is enlarged, has an opening width adapted to the dust collecting cover 4, increases the range in which the suction force is effectively provided, and reduces the power consumption of the airflow entering the conformal opening 33. .

Referring to FIG. 1 to FIG. 4 , the more specific structure of the vacuum enhancement conduit 3 includes at least one compartment 34 disposed in the negative pressure enhancement space 321 , and the negative pressure enhancement space 321 is divided into a plurality of air flow passages. And the negative pressure enhancing conduit 3 has a plurality of conformal openings 33 in communication with the respective gas flow passages. In the preferred embodiment, the negative pressure enhancement space 321 is divided into two air flow passages by a partition 34 to communicate with the two conformal openings 33 to form a Y-shaped end. There are two Y-shaped double suction ducts that conform to the opening 33. As can be seen in the cross section of the vacuum enhanced conduit 3 shown in FIG. 3, the cross-sectional height of the negative pressure enhancing space 321 is smaller than the confluent space 311. Further, in another cross section of FIG. 4, the cross-sectional width of the negative pressure reinforcing space 321 is gradually reduced from the conformal opening 33 toward the direction of the confluent space 311. The width of the conformal opening 33 can be covered, and the purpose of expanding the vacuuming range and improving the phenomenon of uneven suction is achieved. Furthermore, the end edge of the conformal opening 33 can be smoothly connected to the inner edge of the wall surface 41 in accordance with the shape of the inner edge of the wall surface 41. Taking the preferred embodiment of FIG. 1 to FIG. 4 as an example, the inner edge of the wall surface 41 is taken as an example. Surrounding a grinding wheel 5 in an arc shape, and the compliant opening 33 has a matching inner wall 41 The arcuate edge of the edge. The cross-sectional width of the end of the negative pressure reinforcing space 321 is less than or equal to the width of the inner edge of the wall surface 41. If the cross-sectional width of the end of the negative pressure reinforcing space 321 is closer to the inner edge width of the dust collecting cover 4, the conformal opening 33 end The smaller the angle of the bend between the edge and the wall 41, the more smoothly the airflow passes through the conformal opening 33, which improves the problem that the aerodynamic force (suction) drops substantially alongside the conformal opening 33. Through the above characteristics, the suction is uniformized, the suction coverage is expanded, and the kinetic energy loss of the gas flow is reduced. Under the above advantages, a smaller power can be used to achieve a good vacuuming effect, and energy waste can also be reduced.

The above technology can achieve the purpose of improving the dust collecting performance in the present case, and the type of the power tool or the application tool can be included in the technical idea of the present invention in the range that can be understood by those skilled in the art. The dust collecting cover 4 described above is not limited to the wraparound structure, and the dust collecting cover 4 may have an opening or a semicircular shape to facilitate the operation of an application tool such as a grinding wheel 5. Although the present invention has been disclosed above in the preferred embodiment, it is not intended to limit the present invention. Anyone who is familiar with this skill and does not deviate from the spirit and scope of this case, and some of the changes and refinements should be covered in this case. Therefore, the scope of protection of this case is subject to the definition of the patent application scope attached.

In summary, this case enhances the above-mentioned effects compared with the well-known creations. It should fully comply with the statutory innovation patent requirements of novelty and progressiveness. If you apply in accordance with the law, you are requested to approve the application for this invention patent to encourage creation. Debian.

11‧‧‧Output Department

2‧‧‧Airflow line

31‧‧‧Connecting Department

311‧‧‧ Confluence space

32‧‧‧ Negative Pressure Enhancement Department

321‧‧‧Negative pressure enhancement space

33‧‧‧ conformal opening

34‧‧‧ compartment

4‧‧‧ dust cover

41‧‧‧ wall

42‧‧‧ Diversion opening

Claims (7)

A negative pressure dust collecting structure of a power tool, the power tool being connected to an application tool for operating in a working space surrounding a dust collecting cover, the dust collecting cover having at least one diversion opening through a negative pressure reinforcing conduit and a gas flow tube The roadway is characterized in that: the negative pressure enhancement conduit has a negative pressure enhancement space communicating with the flow opening, the negative pressure enhancement space is provided with at least one compartment and is divided into a plurality of airflow passages, and the negative pressure The reinforcing conduit has a plurality of conformal openings communicating with the respective airflow passages, and the negative pressure enhancing space has a tapered cross-sectional area from the diversion opening toward the airflow conduit to enhance the collection of the negative pressure enhancing conduit from the dust collecting hood The suction of dust. The negative pressure dust collecting structure of the power tool according to claim 1, wherein the negative pressure reinforcing conduit comprises at least one compliant opening, a connecting portion connecting the air flow conduit, and a compliant opening and connecting a negative pressure augmenting portion between the portions, wherein the number of the flow guiding openings is connected to each other corresponding to the conformal opening, wherein the negative pressure reinforcing space is located in the negative pressure reinforcing portion, the connecting portion has a cross-sectional area smaller than the air flow conduit The confluence space of the inner cross-sectional area, the negative pressure enhancement space of the negative pressure enhancement portion communicates with the confluence space to send the airflow and the collected dust through the confluence space to the negative pressure enhancement conduit. The negative pressure dust collecting structure of the power tool according to claim 1 or 2, wherein the negative pressure reinforcing space has a section height smaller than the confluence space, and the cross-sectional width of the negative pressure reinforcing space is self-joining the set One of the dust hoods tapers smoothly toward the airflow line. The negative pressure dust collecting structure of the power tool of claim 2, wherein the dust collecting hood has a wall surface surrounding the working space, and an end edge of the compliant opening cooperates with a shape of the inner edge of the wall surface The inner edges of the walls are smoothly connected. The negative pressure dust collecting structure of the power tool according to claim 4, wherein the dust collecting hood is The edge surrounds the application tool in an arc shape, and the conformal opening has an arcuate end edge that matches the inner edge of the dust collecting cover. The negative pressure dust collecting structure of the power tool of claim 5, wherein the cross-sectional width of the end of the negative pressure reinforcing space is less than or equal to the width of the inner edge of the wall. The negative pressure dust collecting structure of the power tool according to claim 1, wherein the application tool is a grinding wheel.