A pneumatic wrench

Abstract

The utility model discloses a pneumatic wrench, including the casing, the right side of casing is provided with the back cover, the bottom mounting of casing has the handle, the back cover and handle are connected through the sealed gas guide component, the sealed gas guide component includes the air inlet and the air inlet channel, the air inlet channel is set up in the bottom of handle, the air inlet is installed in the bottom of air inlet channel inner wall, the position of air inlet channel and the corresponding back cover installs the gas guide nozzle with its intercommunication. The utility model discloses a sealing ring is arranged at the cooperation of gas guide nozzle and gas guide mouth, and adopts the structure of the plug -in type of gas guide nozzle inserts into the gas guide mouth, forms double -layer sealing guarantee, compared with the mode of relying on paper sealing gasket in traditional split type design, sealing ring material is more wear -resisting, and the anti -aging, and the plug -in structure can enhance the sealing pressure through physical cooperation, effectively resist the vibration in long -term use, temperature change and gas impact, and the risk of gas leakage is reduced greatly.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic wrench technology, specifically a pneumatic wrench. Background Technology

[0002] Pneumatic wrenches are based on the principle of air pressure transmission and are widely used in many industries, such as automobile repair, heavy equipment maintenance, product assembly, major construction projects, installation of wire thread inserts, and any other application requiring high torque output. Pneumatic wrenches primarily convert compressed gas into rotational kinetic energy, which is then used to output torque through a striking mechanism. One end of the air intake connects to the handle, and the other end connects to the rear cover.

[0003] According to application number CN202420540346.X, a pneumatic wrench is disclosed, relating to the field of pneumatic tool technology. To address the problems of existing pneumatic wrenches being cumbersome and heavy, this pneumatic wrench includes a rear shell, a front shell, and a knob. Specifically, the rear shell includes a rear cover plate and a handle, which are integrated into a single structure to simplify overall tool assembly and improve assembly accuracy. The front shell is detachably located at the front end of the rear shell and connected to it. The knob is detachably located at the rear end of the rear shell and rotatably connected to it. The front end of the knob abuts against the end cap. During assembly, the knob is first installed on the rear shell, then the end cap abuts against the front end of the knob. A motor is then installed to press the end cap against the knob. Finally, the front shell is installed and bolted from the rear end of the rear shell to the front end. The rear shell is designed as an integrated structure of the rear cover plate and the handle. Compared to tools with the same torque output, this wrench is lighter and has a more stable torque output.

[0004] In the above case, the pneumatic wrench's rear cover is completely flat, and the two are sealed only by a paper gasket in the middle. The drawback of this design is that the paper gasket is prone to wear, aging, or deformation due to vibration, temperature changes, and gas pressure impacts during long-term use, which leads to a decrease in sealing performance and gas leakage. Gas leakage not only causes power loss and reduces the stability of the tool's output torque, but may also generate additional noise due to airflow turbulence at the leakage point, while increasing the cost of compressed gas consumption. Utility Model Content

[0005] The purpose of this invention is to provide a pneumatic wrench to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a pneumatic wrench, including a housing, a rear cover on the right side of the housing, and a handle installed at the bottom of the housing. The rear cover and the handle are connected by a sealing air guiding assembly. The sealing air guiding assembly includes an air inlet and an air inlet channel. The air inlet channel is located at the bottom of the handle, and the air inlet is installed at the bottom of the inner wall of the air inlet channel. An air guide nozzle communicating with the rear cover is installed on the air inlet channel at a position corresponding to the rear cover. An air guide port is provided on the left side of the rear cover at a position corresponding to the air guide nozzle. The right end of the air guide nozzle passes through the air guide port and extends into its interior.

[0007] Preferably, a sealing ring is installed on the inner wall of the air inlet and on the surface of the air nozzle, the sealing ring being used to seal the air nozzle and the air inlet.

[0008] Preferably, the rear cover is mounted to the right side of the housing by multiple bolts, a knob is installed on the right side of the housing corresponding to the position of the rear cover, and an air inlet is provided on the right side of the housing.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0010] This invention provides a double sealing guarantee by setting a sealing ring at the mating point of the air inlet and the air outlet, and by adopting an interlocking structure in which the air inlet is inserted into the air outlet. Compared with the traditional split design that relies on paper gaskets, the sealing ring material is more wear-resistant and anti-aging, and the interlocking structure can enhance the sealing pressure through physical cooperation, effectively resisting vibration, temperature changes and gas impact during long-term use, and significantly reducing the risk of air leakage. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0012] Figure 2 This is a three-dimensional structural diagram of the housing and back cover of this utility model separated.

[0013] Figure 3 This is a three-dimensional structural schematic diagram of the housing and rear cover of this utility model separated from the side view.

[0014] Figure 4 This is a three-dimensional cross-sectional view of the housing and rear cover of this utility model;

[0015] Figure 5 This is a three-dimensional cross-sectional view of the grip, air intake channel and air guide nozzle of this utility model;

[0016] Figure 6 This is a three-dimensional structural diagram of the rear cover, air vent, and sealing ring of this utility model;

[0017] Figure 7This is a three-dimensional structural diagram of the housing, back cover, and grip of this utility model.

[0018] In the diagram: 1. Housing, 2. Rear cover, 3. Grip, 4. Air guide assembly, 41. Air inlet, 42. Air inlet channel, 43. Air guide nozzle, 44. Air guide port, 45. Sealing ring, 5. Knob, 6. Air inlet. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example 1

[0021] Please see Figure 1-7 A pneumatic wrench includes a housing 1, a rear cover 2 on the right side of the housing 1, and a handle 3 mounted on the bottom of the housing 1. The top of the handle 3 is connected to the housing 1 by welding or integral injection molding to ensure connection strength. The rear cover 2 and the handle 3 are connected by a sealing air guide assembly 4. The rear cover 2 is mounted to the right side of the housing 1 by multiple bolts. A knob 5 is mounted on the right side of the housing 1, corresponding to the position of the rear cover 2. The knob 5 is a cylindrical adjusting component with a threaded or snap-fit ​​structure on its inner side, and is rotatably connected to the corresponding position on the housing 1. By rotating the knob 5, the air intake or striking frequency can be adjusted, thereby controlling the output torque. The adjustment range is adapted to common working conditions, such as 5-1000 N·m. The specific adjustment mechanism adopts conventional methods in the art. The design is either valve-type or throttling-type. An air inlet 6 is located on the right side of the housing 1. The air inlet 6 is connected to the cylinder inside the housing 1 through an internal air passage. This air inlet 6 is used to transport compressed gas introduced from the rear cover 2 to the power component 1. The direction and inner diameter of the air passage are adapted to the gas flow requirements to ensure stable air pressure transmission. The housing 1 contains the core power component of the pneumatic wrench, including but not limited to the cylinder, rotor, blades, and striking structure, such as the impact block and anvil. The striking structure is used to convert the kinetic energy of the compressed gas into torque output. It is adapted to the transmission component inside the rear cover 2 to realize power transmission. Although this part is not shown in detail, it conforms to the conventional power transmission logic of pneumatic wrenches in this field and can be understood in conjunction with existing technology.

[0022] The sealing air guide assembly 4 includes an air inlet 41 and an air inlet channel 42. The air inlet channel 42 is located at the bottom of the handle 3. The air inlet 41 is installed at the bottom of the inner wall of the air inlet channel 42. The air inlet 41 is used to connect to an external compressed gas source and is the first interface for gas to enter the wrench. Its diameter is compatible with conventional gas source connectors to ensure the sealing and universality of the gas connection. An air guide nozzle 43 is installed on the air inlet channel 42 and at the position corresponding to the rear cover 2, communicating with it. It penetrates the hollow channel inside the handle 3 and serves as the transmission path for gas from the air inlet 41 to the air guide nozzle 43. The inner diameter of the channel is designed according to the gas flow requirements to ensure that the air pressure loss is minimized during transmission. An air guide port 44 is opened on the left side of the rear cover 2 and at the position corresponding to the air guide nozzle 43. The right end of the air guide nozzle 43 passes through the air guide port 44 and extends into its interior, extending out from the air inlet channel 42. The air inlet 44 inserted into the back cover 2 facilitates air path transfer, guiding the gas in the handle 3 into the inner side of the back cover 2. Simultaneously, its columnar structure cooperates with the air inlet 44 to enhance the connection strength between the back cover 2 and the handle 3. A sealing ring 45 is installed on the inner wall of the air inlet 44 and on the surface of the air nozzle 43. The sealing ring 45 is used to seal the air nozzle 43 and the air inlet 44. The sealing ring 45 is made of oil-resistant nitrile rubber, with a circular or square cross-section. Its inner diameter is interference-fitted with the outer diameter of the air nozzle 43 to ensure a tight fit under pressure, improving the sealing effect. The handle 3 adopts an ergonomic design for the operator's grip, and its anti-slip surface structure enhances operational safety. The internal air intake channel 42 is the main flow path for compressed gas and also serves as the mounting carrier for the sealing air guide assembly 4, connecting the air inlet 41 and the air nozzle 43 to achieve longitudinal air transmission.

[0023] In use, rotate the knob 5 on the right side of the housing 1 to adjust the output torque according to the work requirements. During the adjustment process, the knob 5 controls the air intake through the internal valve structure. Compressed gas enters the air intake channel 42 of the handle 3 through the air intake nozzle 41, and is transmitted to the air guide nozzle 43 along the channel. Through the interlocking structure of the air guide nozzle 43 and the air guide port 44 and the sealing effect of the sealing ring 45, it enters the inner side of the rear cover 2 without leakage, and then is introduced into the internal cylinder through the air intake port 6 of the housing 1. The gas drives the rotor and blades to move in the cylinder, which drives the striking structure to operate and converts kinetic energy into torque output.

[0024] Example 2

[0025] The sealing air guide assembly 4 includes an air inlet 41 and an air inlet channel 42. The air inlet channel 42 is located at the bottom of the handle 3. The air inlet 41 is installed at the bottom of the inner wall of the air inlet channel 42. The air inlet 41 is used to connect to an external compressed gas source and is the first interface for gas to enter the wrench. Its diameter is compatible with conventional gas source connectors to ensure the sealing and universality of the air circuit connection. A second air guide is installed on the rear cover 2 at a position corresponding to the air inlet channel 42. The second air guide communicates with the interior of the rear cover 2. The left end of the second air guide penetrates the air inlet channel 42 and extends into its interior. The second air guide is located on the inner wall of the air inlet channel 42 and on the surface of the second air guide. A second sealing ring is installed to seal the second air guide nozzle and the air intake channel 42. The second sealing ring is made of oil-resistant nitrile rubber with a circular or square cross-section. Its inner diameter is interference-fitted with the outer diameter of the second air guide nozzle to ensure a tight fit under pressure and improve the sealing effect. In use, compressed gas enters the air intake channel 42 of the handle 3 through the air intake nozzle 41, is transmitted to the second air guide nozzle along the channel, enters the inner side of the rear cover 2 through the second air guide nozzle, and is then introduced into the internal cylinder through the air intake port 6 of the housing 1. The gas drives the rotor and blades to move in the cylinder, which drives the striking structure to operate and converts kinetic energy into torque output.

[0026] Example 3

[0027] The sealing air guide assembly 4 includes an air inlet 41 and an air inlet channel 42. The air inlet channel 42 is located at the bottom of the handle 3, and the air inlet 41 is installed at the bottom of the inner wall of the air inlet channel 42. The air inlet 41 is used to connect to an external compressed gas source and is the first interface for gas to enter the wrench. Its diameter is compatible with conventional gas source connectors to ensure the sealing and universality of the air circuit connection. An air guide port 44 is provided on the rear cover 2 at a position corresponding to the air inlet channel 42. A connecting pipe is provided between the air inlet channel 42 and the air guide port 44. One end of the connecting pipe near the air inlet channel 42 passes through the air inlet channel 42 and extends into it, while the other end of the connecting pipe near the air guide port 44 passes through the air guide port 44 and extends into it. The connecting pipe is used to connect the air guide port 44 and the air inlet channel 42. The inner wall of the air inlet channel 42... A third sealing ring is installed on the inner wall of the air inlet 44 and on the surface of the connecting pipe. The third sealing ring is used to seal the air inlet channel 42 and the connecting pipe, and at the same time seal the air inlet 44 and the connecting pipe. The third sealing ring is made of oil-resistant nitrile rubber, with a circular or square cross-section. The inner diameter is interference-fitted with the outer diameter of the connecting pipe to ensure a tight fit under pressure and improve the sealing effect. In use, compressed gas enters the air inlet channel 42 of the handle 3 through the air inlet 41, is transmitted to the connecting pipe along the channel, enters the air inlet 44 through the connecting pipe, and then enters the inner side of the rear cover 2 through the air inlet. Then it is introduced into the internal cylinder through the air inlet 6 of the housing 1. The gas drives the rotor and blades to move in the cylinder, drives the striking structure to operate, and converts kinetic energy into torque output.

[0028] Although embodiments of the present 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 present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pneumatic wrench, characterized in that: The device includes a housing (1), a rear cover (2) on the right side of the housing (1), a handle (3) on the bottom of the housing (1), the rear cover (2) and the handle (3) are connected by a sealing air guide assembly (4), the sealing air guide assembly (4) includes an air inlet (41) and an air inlet channel (42), the air inlet channel (42) is opened at the bottom of the handle (3), the air inlet (41) is installed at the bottom of the inner wall of the air inlet channel (42), an air guide nozzle (43) is installed on the air inlet channel (42) and at the position corresponding to the rear cover (2), and an air guide port (44) is opened on the left side of the rear cover (2) and at the position corresponding to the air guide nozzle (43), the right end of the air guide nozzle (43) passes through the air guide port (44) and extends into its interior.

2. The pneumatic wrench according to claim 1, characterized in that: A sealing ring (45) is installed on the inner wall of the air inlet (44) and on the surface of the air nozzle (43). The sealing ring (45) is used to seal the air nozzle (43) and the air inlet (44).

3. The pneumatic wrench according to claim 1, characterized in that: The rear cover (2) is mounted on the right side of the housing (1) by multiple bolts. A knob (5) is installed on the right side of the housing (1) and at the position corresponding to the rear cover (2). An air inlet (6) is provided on the right side of the housing (1).

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