A brushless motor silent pistol drill

Abstract

The application relates to the technical field of handheld gun drills, and discloses a brushless motor mute gun drill, which comprises a gun body and a chuck, the inner wall of the gun body is fixedly connected with a driving motor, the outer wall of the driving motor is provided with a flow guide mechanism, the flow guide mechanism comprises a flow guide sleeve, the flow guide sleeve is sleeved in the gun body, a flow guide cavity is formed in the flow guide sleeve, baffles are fixedly connected to the cavity wall of the flow guide cavity and separate the flow guide cavity into different volume cavities, the baffles are provided with flow guide holes to communicate the inside of the flow guide cavity, the heat dissipation air reduces noise during flow in the different volume cavities in the flow guide cavity, and a flow distribution fan is arranged, which rotates along the inner wall of the flow guide sleeve. The flow guide mechanism is arranged to guide the heat dissipation air, the heat dissipation air flows in the flow guide cavities of different volumes separated by the baffles, the heat dissipation air is subjected to noise reduction, the noise generated by the driving motor is subjected to sound insulation, and the noise generated by the driving motor and the heat dissipation air is reduced.

Description

Technical Field

[0001] This invention relates to the field of handheld gun drill technology, specifically a brushless motor silent hand drill. Background Technology

[0002] Brushless motor pistol drills are used to drill holes in workpieces, meeting the drilling needs of assembly construction, providing power support for drilling operations, and ensuring the smooth progress of drilling work.

[0003] Patent application CN201820191684.1 discloses a noise-reducing electric drill, including a drill body and an anti-slip handle. The anti-slip handle is located below the drill body and is fixedly connected to the drill body. A lithium battery is located below the anti-slip handle and is embedded in the anti-slip handle. An adjustment position is located on the left side surface of the drill body and is rotatably connected to the drill body. This noise-reducing electric drill is equipped with a fan silencer and vibration damping pads.

[0004] However, when using a brushless motor pistol drill, the noise from the brushless motor and the cooling fan noise are quite prominent. Furthermore, the vibration generated by the drill bit and the workpiece at high speeds exacerbates the noise, and long-term use can easily cause hearing damage to the operator. Summary of the Invention

[0005] The purpose of this invention is to provide a brushless motor-driven silent pistol drill to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a brushless motor silent pistol drill, comprising a gun body and a chuck, wherein a drive motor is fixedly connected to the inner wall of the gun body, and a flow guiding mechanism is provided on the outer wall of the drive motor; The flow guiding mechanism includes a flow guiding sleeve, which is fitted inside the gun body. A flow guiding cavity is opened inside the flow guiding sleeve. A baffle is fixedly connected to the cavity wall of the flow guiding cavity to isolate the flow guiding cavity into cavities of different volumes. The baffle has a flow guiding hole to connect the inside of the flow guiding cavity, so as to reduce noise during the flow of heat dissipation air in the different volumes of the flow guiding cavity. The distribution fan rotates along the inner wall of the guide sleeve. A second guide groove is provided on the side of the distribution fan near the guide cavity. When the distribution fan rotates, it draws heat dissipation air through the second guide groove and guides the heat dissipation air into the guide cavity. A vent is provided on the side of the gun body near the drive motor to introduce external air into the gun body.

[0007] According to the above technical solution, the inner wall of the guide sleeve is provided with a connecting groove, which is connected to the inside of the guide cavity. The connecting groove is used to guide the heat dissipation air, so that the heat dissipation air inside the guide cavity flows to the outer wall of the drive motor for auxiliary heat dissipation. The outer wall of the guide sleeve cools the heat dissipation air inside the guide cavity by opening heat dissipation grooves.

[0008] According to the above technical solution, the guide sleeve is fitted outside the drive motor, the output end of the drive motor is fixedly connected to a drive shaft, the drive shaft is fixedly connected to the distribution fan, the drive motor serves as a power source to drive the drive shaft to rotate the distribution fan on the inner wall of the guide sleeve, the outer wall of the drive shaft is slidably connected to the inner wall of the chuck through a spline, and the chuck rotates on the inner wall of the gun body.

[0009] According to the above technical solution, an isolation plate is fixedly connected to the inner wall of the gun body. The isolation plate is in contact with the distribution fan on the side near the distribution fan. The isolation plate has a flow guide groove for guiding the heat dissipation gas. An isolation sleeve is fixedly connected to the side of the isolation plate away from the distribution fan. The isolation sleeve is fitted onto the outer wall of the clamp. A spring is fixedly connected to one end of the clamp near the isolation plate. The other end of the spring is fixedly connected to the outer wall of the isolation plate. The spring is used to support the clamp.

[0010] According to the above technical solution, the outer wall of the isolation sleeve is provided with a pressure mechanism, the pressure mechanism includes an airbag, the airbag is sleeved in the gun body, a top block is sleeved inside the airbag on the side away from the isolation plate, the top block slides along the outer wall of the isolation sleeve, a guide groove three is opened on the outer wall of the top block, an air outlet is opened on the side of the airbag near the top block, the position of the air outlet corresponds to the position of the guide groove three, and the guide groove three is used to guide the heat dissipation air.

[0011] According to the above technical solution, a pressure block is fixedly connected to the end of the top block away from the airbag. The pressure block slides inside the gun body. An inner cavity is opened inside the airbag. A pressure relief groove is opened on the outer wall of the pressure block. The pressure relief groove is used to guide the cooling air. The airbag fills the inner cavity with cooling air and squeezes the top block, causing the top block to drive the pressure block to slide along the clamp, so that the pressure relief groove protrudes from the outer wall of the gun body, guiding the cooling air to the outside of the gun body.

[0012] According to the above technical solution, a spring is fixedly connected to the end of the top block away from the airbag, and the other end of the spring is fixedly connected to the inner wall of the gun body. The spring is used to support the top block so that the top block provides reverse support to the airbag and increases the air pressure inside the cavity. An air inlet is provided on the outer wall of the airbag, and the position of the air inlet corresponds to the position of the guide groove. The guide groove is used to guide the heat dissipation air through the air inlet into the inner cavity.

[0013] According to the above technical solution, the inner cavity wall is fixedly connected with a partition plate, which is used to isolate multiple cavities of different volumes within the inner cavity. The partition plate is provided with a connecting hole, which is used to connect cavities of different volumes within the inner cavity, thereby reducing noise when heat dissipation air flows inside the inner cavity.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention guides the cooling air by setting a flow guiding mechanism, so that the cooling air flows through the flow guiding cavities of different volumes isolated by the baffle. While reducing the noise of the cooling air, it also insulates the noise generated by the drive motor, thereby reducing the noise generated by the drive motor and the cooling air.

[0015] 2. The present invention guides the cooling air through a flow guiding mechanism, allowing the cooling air to circulate inside the drive motor for heat dissipation. After the cooling air enters the flow guiding cavity and is cooled by the flow guiding sleeve, it flows through the connecting groove to the outer wall of the drive motor, thus providing auxiliary heat dissipation for the drive motor and increasing the heat dissipation efficiency of the drive motor.

[0016] 3. The present invention provides a pressure mechanism that intermittently releases pressure when the pistol drill is drilling a workpiece at high speed. This mechanism works in conjunction with the drill body to guide the released cooling air, allowing the released cooling air to blow away the debris generated at the drilling point, thereby reducing the noise caused by excessive debris accumulation and friction with the drill bit.

[0017] 4. The present invention uses a pressure mechanism and a flow guiding mechanism to release pressure when the hand drill rotates at high speed, preventing the heat dissipation air pressure from being too high when the hand drill speed is high, which would cause the heat dissipation air to flow in the flow guiding cavity with high pressure and generate noise, and further increasing the stability of the flow guiding mechanism in noise reduction of the drive motor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 Cross-sectional view of the present invention Figure 1 ; Figure 3 Cross-sectional view of the present invention Figure 2 ; Figure 4 Cross-sectional view of the present invention Figure 3 ; Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle; Figure 6 Cross-sectional view of the present invention Figure 4 ; Figure 7 A cross-sectional view of the flow guiding mechanism of the present invention. Figure 1 ; Figure 8 For the present invention Figure 7 Enlarged view of point B in the middle; Figure 9 A cross-sectional view of the flow guiding mechanism of the present invention. Figure 2 ; Figure 10 This is a cross-sectional view of the pressure mechanism of the present invention; Figure 11 This is a cross-sectional view of the airbag of the present invention.

[0019] In the diagram: 100, gun body; 101, chuck; 102, drive motor; 103, isolation plate; 104, isolation sleeve; 105, spring one; 106, drive shaft; 107, guide channel one; 108, spring two; 200, guide mechanism; 201, guide sleeve; 202, distribution fan; 203, guide channel two; 204, connecting groove; 205, guide cavity; 206, baffle; 207, guide hole; 300, pressure mechanism; 301, airbag; 302, pressure block; 303, pressure relief groove; 304, top block; 305, guide channel three; 306, inner cavity; 307, partition; 308, connecting hole; 309, air inlet; 310, air outlet. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Example 1, please refer to Figures 1-9 The present invention provides a technical solution: a brushless motor silent pistol drill, including a gun body 100 and a chuck 101, a drive motor 102 is fixedly connected to the inner wall of the gun body 100, and a flow guiding mechanism 200 is provided on the outer wall of the drive motor 102. When a brushless motor pistol drill is used for drilling, the noise from the brushless motor and the cooling air is relatively prominent. Furthermore, the vibration generated by the drill bit and the workpiece at high speeds exacerbates the noise, which can easily cause hearing damage to operators with long-term use. Therefore, a flow guiding mechanism 200 is set up to guide the cooling air, allowing the cooling air to circulate inside the drive motor 102 for cooling. After entering the flow guiding cavity 205, the cooling air is cooled by the flow guiding sleeve 201 and then guided to the outer wall of the drive motor 102 through the connecting groove 204, which provides auxiliary cooling for the drive motor 102 and increases the cooling efficiency of the drive motor 102. At the same time, the flow guiding mechanism 200 guides the cooling air to flow through the flow guiding cavities 205 of different volumes isolated by the baffle 206, which reduces the noise of the cooling air and insulates the noise generated by the drive motor 102, thereby reducing the noise generated by the drive motor 102 and the cooling air. The flow guiding mechanism 200 includes a flow guiding sleeve 201, which is fitted inside the gun body 100. A flow guiding cavity 205 is opened inside the flow guiding sleeve 201. A baffle 206 is fixedly connected to the cavity wall of the flow guiding cavity 205 to isolate the flow guiding cavity 205 into cavities of different volumes. A flow guiding hole 207 is opened on the baffle 206 to connect the inside of the flow guiding cavity 205, so as to reduce noise during the flow of heat dissipation air in the different cavities of different volumes in the flow guiding cavity 205. The distribution fan 202 rotates along the inner wall of the guide sleeve 201. The distribution fan 202 has a second guide groove 203 on the side near the guide cavity 205. When the distribution fan 202 rotates, it draws heat dissipation air through the second guide groove 203 and guides the heat dissipation air into the guide cavity 205. The gun body 100 has a ventilation port on the side near the drive motor 102 to introduce external air into the gun body 100. The inner wall of the guide sleeve 201 has a connecting groove 204, which communicates with the inside of the guide cavity 205. The connecting groove 204 is used to guide the cooling air, so that the cooling air inside the guide cavity 205 flows to the outer wall of the drive motor 102 for auxiliary cooling. The outer wall of the guide sleeve 201 cools the cooling air inside the guide cavity 205 by forming heat dissipation grooves. The guide sleeve 201 is sleeved on the outside of the drive motor 102. The output end of the drive motor 102 is fixedly connected to a drive shaft 106, which is fixedly connected to a distribution fan 202. The drive motor 102 serves as a power source to drive the drive shaft 106 to rotate the distribution fan 202 within the inner wall of the guide sleeve 201. The outer wall of the drive shaft 106 is open to the outside of the drive sleeve 201. The spline is slidably connected to the inner wall of the chuck 101, and the chuck 101 rotates on the inner wall of the gun body 100. An isolation plate 103 is fixedly connected to the inner wall of the gun body 100. The side of the isolation plate 103 near the distribution fan 202 is in contact with the distribution fan 202. The isolation plate 103 has a first guide groove 107, which is used to guide the heat dissipation gas. An isolation sleeve 104 is fixedly connected to the side of the isolation plate 103 away from the distribution fan 202. The isolation sleeve 104 is fitted on the outer wall of the chuck 101. A second spring 108 is fixedly connected to one end of the chuck 101 near the isolation plate 103. The other end of the second spring 108 is fixedly connected to the outer wall of the isolation plate 103. The second spring 108 is used to support the chuck 101. When using a brushless motor silent pistol drill, the drill bit is gripped by the chuck 101. The drive motor 102 is activated, driving the drive shaft 106 to rotate the chuck 101, causing the drill bit to drill into the workpiece. Simultaneously, the drive shaft 106 drives the distribution fan 202 to rotate within the guide sleeve 201, guiding airflow. External air enters the drill body 100 through the drill body. When the drill bit is rotating at low speed, the distribution fan 202 rotates and draws air from inside the drill body 100 through the second guide groove 203. This air passes through the drive motor 102, cooling it before flowing into the second guide groove 203 and then guided by the distribution fan 202 into the guide cavity 205. During its flow within the guide cavity 205, the cooled air is further cooled by the heat dissipation grooves on the outer wall of the guide sleeve 201. After cooling, the air is then connected to... The slot 204 guides the airflow to the outer wall of the drive motor 102, providing auxiliary heat dissipation for the drive motor 102. It works in conjunction with the distribution fan 202 to establish a cooling cycle. Simultaneously, as the cooling air flows through the guide cavity 205, the baffle 206 isolates the guide cavity 205 into multiple cavities of different volumes, which are then connected through the guide holes 207. This reduces the noise generated by the airflow during the rotation of the drive motor 102. Meanwhile, the guide sleeve 201 wraps around the outer wall of the drive motor 102, isolating the noise generated by the drive motor 102 through the guide cavity 205. Furthermore, the flow of cooling air through the different volumes isolated by the baffle 206 within the guide cavity 205 further reduces the noise generated during the operation of the drive motor 102, while ensuring efficient heat dissipation for the drive motor 102.

[0022] Example 2, based on Example 1, please refer to... Figures 10-11 The present invention provides a technical solution: a pressure mechanism 300 is provided on the outer wall of the isolation sleeve 104; When a brushless motor pistol drill is used for drilling, the noise from the brushless motor and the cooling air noise are relatively prominent. Furthermore, the vibration generated by the drill bit and the workpiece at high speeds exacerbates the noise, which can easily cause hearing damage to operators with long-term use. Therefore, a pressure mechanism 300 is set up to intermittently release pressure when the pistol drill is drilling the workpiece at high speed. In conjunction with the drill body 100, the pressure-relieving air is guided to blow away the debris generated at the drilling site, reducing the noise generated by excessive debris accumulation and friction with the drill bit. At the same time, the pressure mechanism 300 and the flow guiding mechanism 200 work together to release pressure when the pistol drill is rotating at high speed. This prevents the cooling air pressure from being too high when the pistol drill is drilling at high speeds, which would cause the cooling air to flow in the flow guiding cavity 205 with high pressure and generate noise. This further increases the stability of the flow guiding mechanism 200 in reducing noise for the drive motor 102. The pressure mechanism 300 includes an airbag 301, which is fitted inside the gun body 100. A top block 304 is fitted inside the airbag 301 on the side furthest from the isolation plate 103. The top block 304 slides along the outer wall of the isolation plate 104. A guide groove 305 is formed on the outer wall of the top block 304. An air outlet 310 is formed on the side of the airbag 301 near the top block 304. The position of the air outlet 310 corresponds to the position of the guide groove 305, which is used for dissipating heat from the air. For airflow guidance, a pressure block 302 is fixedly connected to the end of the top block 304 away from the airbag 301. The pressure block 302 slides within the gun body 100. An inner cavity 306 is formed inside the airbag 301, and a pressure relief groove 303 is formed on the outer wall of the pressure block 302. The pressure relief groove 303 is used to guide the cooling air. The airbag 301 fills the inner cavity 306 with cooling air, which compresses the top block 304, causing the top block 304 to drive the pressure block 302 to slide along the clamp 101, thus allowing the pressure relief groove to flow. 303 protrudes from the outer wall of the gun body 100, guiding the cooling airflow to the outside of the gun body 100. A spring 105 is fixedly connected to one end of the top block 304 away from the airbag 301. The other end of the spring 105 is fixedly connected to the inner wall of the gun body 100. The spring 105 supports the top block 304, causing it to provide reverse support to the airbag 301, increasing the internal air pressure of the inner cavity 306. An air inlet 309 is provided on the outer wall of the airbag 301. The location of the air inlet 309 is... Corresponding to the location of the guide channel 107, the guide channel 107 is used to guide the heat dissipation air through the air inlet 309 into the inner cavity 306. The inner cavity 306 is fixedly connected to the cavity wall of the cavity 306. The partition 307 is used to isolate multiple cavities of different volumes in the inner cavity 306. The partition 307 is provided with a connection hole 308. The connection hole 308 is used to connect the cavities of different volumes in the inner cavity 306, so as to reduce noise when the heat dissipation air flows in the inner cavity 306. When the pistol drill drills a hole in the workpiece at low speed, the distribution fan 202 is driven by the drive shaft 106 to rotate inside the guide sleeve 201. Air is drawn from inside the gun body 100 into the distribution fan 202 through the second guide groove 203. The distribution fan 202 guides the air into the guide cavity 205. Simultaneously, some air is guided into the inner cavity 306 through the isolation plate 103 and the air inlet 309, filling the airbag 301. The supporting force of the top block 304, supported by the first spring 105, is greater than the squeezing force of the airbag 301 on the top block 304, causing the stepped surface of the pressure block 302 to contact the outer wall of the gun body 100. At the same time, the pressure relief groove 303 is located inside the gun body 100, allowing the air filling the inner cavity 306 to... Unable to be discharged through the vent 310, after the inner cavity 306 is fully inflated, the distribution fan 202 rotates and all the cooling air drawn from the gun body 100 through the second guide channel 203 flows into the guide sleeve 201 to cool the drive motor 102. When the pistol drill drills a hole in the workpiece at high speed, the speed of the distribution fan 202 increases, increasing the airflow velocity drawn from the gun body 100 through the second guide channel 203 to cool the drive motor 102. The airflow velocity and pressure entering the guide cavity 205 increase, increasing the airflow rate into the inner cavity 306, and increasing the pressure inside the airbag 301 to maintain consistency with the pressure inside the guide cavity 205. Simultaneously, the increased pressure inside the airbag 301... The pressure of the top block 304 increases, and the top block 304, through the pressure of the airbag 301, compresses the spring 105, causing it to slide against the outer wall of the drive shaft 106. This, in turn, causes the pressure block 302 to slide against the inner wall of the gun body 100, resulting in the pressure relief groove 303 protruding from the outer wall of the gun body 100. This allows the internal cavity of the gun body 100 to communicate with the outside through the pressure relief groove 303. The cooling gas filled inside the inner cavity 306 flows through the air outlet 310 into the guide groove 305, and then through the pressure relief groove 303 to the outer wall of the gun body 100, establishing a circulation with the ventilation openings on the outer wall of the gun body 100. This allows external air to be continuously introduced into the gun body 100 through the ventilation openings to cool the drive motor 102. The pressure relief groove 303, in conjunction with the gun body 100, guides the blown-out gas. The blown air is directed towards the chuck 101 to remove drill bits and debris, reducing noise caused by debris accumulation and friction with the drill bit. After the cooling air is depressurized, the top block 304 is supported by the spring 105, causing the pressure block 302 to slide on the outer wall of the chuck 101 and retracting the pressure relief groove 303 into the gun body 100. This causes the cooling air to pressurize within the inner cavity 306, intermittently releasing pressure to clean drill bits and prevents excessive cooling air pressure at high drilling speeds, which could lead to noise from the airflow within the guide cavity 205. Simultaneously, the pressure block 302, driven by the top block 304, slides on the outer wall of the chuck 101, supporting the chuck 101 during high-speed rotation.To reduce vibration generated when the chuck 101 drives the drill bit to drill through the workpiece, and to reduce the noise generated by the vibration.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A brushless motor silent pistol drill, comprising a gun body (100) and a chuck (101), characterized in that, A drive motor (102) is fixedly connected to the inner wall of the gun body (100), and a flow guiding mechanism (200) is provided on the outer wall of the drive motor (102). The flow guiding mechanism (200) includes: A flow guide sleeve (201) is fitted inside the gun body (100). A flow guide cavity (205) is opened inside the flow guide sleeve (201). A baffle (206) is fixedly connected to the cavity wall of the flow guide cavity (205) to isolate the flow guide cavity (205) into cavities of different volumes. A flow guide hole (207) is opened on the baffle (206) to connect the inside of the flow guide cavity (205) so that the noise is reduced when the heat dissipation air flows in the different cavities of the flow guide cavity (205). A distribution fan (202) rotates along the inner wall of the guide sleeve (201). A second guide groove (203) is provided on the side of the distribution fan (202) near the guide cavity (205). When the distribution fan (202) rotates, it draws heat dissipation air through the second guide groove (203) and guides the heat dissipation air into the guide cavity (205). An isolation plate (103) is fixedly connected to the inner wall of the gun body (100). An isolation sleeve (104) is fixedly connected to the side of the isolation plate (103) away from the distribution fan (202). A pressure mechanism (300) is provided on the outer wall of the isolation sleeve (104). The pressure mechanism (300) includes an air bag (301). The air bag (301) is sleeved in the gun body (100). A top block (304) is sleeved inside the side of the air bag (301) away from the isolation plate (103). The top block (304) slides along the outer wall of the isolation sleeve (104). A guide groove (305) is opened on the outer wall of the top block (304). An air outlet (310) is opened on the side of the air bag (301) near the top block (304). The position of the air outlet (310) corresponds to the position of the guide groove (305). The guide groove (305) is used to guide the cooling air. The top block (304) is fixedly connected to a pressure block (302) at the end away from the airbag (301). The pressure block (302) slides inside the gun body (100). An inner cavity (306) is provided inside the airbag (301). A pressure relief groove (303) is provided on the outer wall of the pressure block (302). The pressure relief groove (303) is used to guide the cooling air. The airbag (301) is filled with cooling air through the inner cavity (306) and squeezes the top block (304), causing the top block (304) to drive the pressure block (302) to slide along the clamp (101), so that the pressure relief groove (303) protrudes out of the outer wall of the gun body (100) and guides the cooling air to the outside of the gun body (100).

2. The brushless motor silent pistol drill according to claim 1, characterized in that: The inner wall of the guide sleeve (201) is provided with a connecting groove (204), which is connected to the inside of the guide cavity (205). The connecting groove (204) is used to guide the heat dissipation air, so that the heat dissipation air inside the guide cavity (205) flows to the outer wall of the drive motor (102) for auxiliary heat dissipation. The outer wall of the guide sleeve (201) cools the heat dissipation air inside the guide cavity (205) by opening heat dissipation grooves.

3. A brushless motor silent pistol drill according to claim 2, characterized in that: The flow guide sleeve (201) is sleeved outside the drive motor (102). The output end of the drive motor (102) is fixedly connected to the drive shaft (106). The drive shaft (106) is fixedly connected to the distribution fan (202). The drive motor (102) serves as a power source to drive the drive shaft (106) to rotate the distribution fan (202) on the inner wall of the flow guide sleeve (201). The outer wall of the drive shaft (106) is slidably connected to the inner wall of the chuck (101) through a spline. The chuck (101) rotates on the inner wall of the gun body (100).

4. A brushless motor silent pistol drill according to claim 3, characterized in that: The isolation plate (103) is in contact with the distribution fan (202) on the side near the distribution fan (202). The isolation plate (103) has a first guide groove (107) for guiding the heat dissipation gas. The isolation sleeve (104) is fitted on the outer wall of the clamp (101). A second spring (108) is fixedly connected to one end of the clamp (101) near the isolation plate (103). The other end of the second spring (108) is fixedly connected to the outer wall of the isolation plate (103). The second spring (108) is used to support the clamp (101).

5. A brushless motor silent pistol drill according to claim 1, characterized in that: A spring (105) is fixedly connected to one end of the top block (304) away from the airbag (301). The other end of the spring (105) is fixedly connected to the inner wall of the gun body (100). The spring (105) is used to support the top block (304) so ​​that the top block (304) provides reverse support to the airbag (301) and increases the air pressure inside the inner cavity (306). An air inlet (309) is provided on the outer wall of the airbag (301). The position of the air inlet (309) corresponds to the position of the guide groove (107). The guide groove (107) is used to guide the heat dissipation air through the air inlet (309) into the inner cavity (306).

6. A brushless motor silent pistol drill according to claim 5, characterized in that: The inner cavity (306) is fixedly connected to a partition (307). The partition (307) is used to isolate multiple cavities of different volumes within the inner cavity (306). The partition (307) has a connecting hole (308). The connecting hole (308) is used to connect cavities of different volumes within the inner cavity (306) to reduce noise when the cooling air flows inside the inner cavity (306).

Images