An electric clipper

Abstract

The application discloses an electric clipper, which comprises a body, a fixed blade arranged at the head of the body, and a movable blade provided with a permanent magnet, wherein the head of the body is further provided with a first stator coil winding and a second stator coil winding arranged along the moving direction of the movable blade, and the first stator coil winding and the second stator coil winding are located at the two sides of the permanent magnet. The first stator coil winding and the second stator coil winding are arranged at the two sides of the permanent magnet along the sliding direction of the movable blade, and the movable blade is driven to reciprocate between the first stator coil winding and the second stator coil winding relative to the fixed blade under the magnetic field force of the two sides when the current is input into the first stator coil winding and the second stator coil winding, so that the movable blade and the fixed blade are interlaced to cut off the hair, and the mechanical efficiency of the overall system and the efficiency of the electric energy conversion into mechanical energy are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of hair styling tools, specifically to an electric hair clipper. Background Technology

[0002] In global mass production solutions for electric hair clippers, there are only two power drive methods. The first is a oscillating motor developed based on the operating principle of a "disc motor." It uses the interaction force between a coil and a permanent magnet to drive the motor shaft in a oscillating motion, which in turn drives the moving blade in a reciprocating motion, thus working in conjunction with the stationary blade to cut the hair. The second method is a conventional rotary motor with an eccentric wheel. An eccentric wheel mounted on the motor shaft of the rotary motor completes the displacement component required by the moving blade plane, and finally, the convex shaft of the eccentric wheel drives the moving blade in a lateral reciprocating motion. Both methods have their own drawbacks, as well as a common one.

[0003] For oscillating electric shears based on the "disc motor" principle, the displacement required for the moving blade is generated directly through the left-right reciprocating motion of the motor. Therefore, the actual vibration source has a relatively large mass, resulting in strong vibrations. Furthermore, due to the operating requirements of the electric shears, which necessitate reciprocating motion with specific positional constraints, the motor stator and rotor must be connected via a mechanical structure. In actual operation, the noise level generated is significantly higher than that of eccentric wheel electric shears.

[0004] Rotary eccentric wheel electric hair clippers, because their motor rotates 360 degrees, exhibit a sinusoidal distribution in horizontal (left-right) displacement caused by the eccentric wheel. That is, as the motor rotates one full turn (360 degrees), the horizontal displacement component gradually increases, then decreases to zero, then increases again, and finally decreases to zero. This displacement fluctuation also reflects the fluctuation in the driving force on the moving blades. Therefore, in actual operation, the driving force of the moving blades is constantly changing. This change causes fluctuations in the force used to cut hair, easily leading to problems such as hair getting stuck, causing discomfort to the person having their hair cut. Furthermore, due to its rotating operating method, its system efficiency is low, with a large portion of energy being used for useless work.

[0005] Both types of electric shears driven by different motor power architectures share common drawbacks. Due to the requirement for rapid reciprocating linear motion in electric shears, they cannot be directly equipped with conventional motors (i.e., those consisting of stators, rotors, windings, motor shafts, etc.). Additional components must always be added to the motor to meet the lateral reciprocating motion requirements. Therefore, they occupy a larger space. Furthermore, the increased number of mechanical transmission structures results in higher noise levels during operation, and the overall system efficiency is lower than that of conventional rotating machinery. Summary of the Invention

[0006] To address the aforementioned issues, an electric hair clipper is provided. By directly placing a permanent magnet on the moving blade, the magnetic force generated by the coil remains consistent with its direction of movement, reducing the force components in other directions to zero. This significantly improves the overall mechanical efficiency of the system and the efficiency of converting electrical energy into mechanical energy, thus solving the problem of low force efficiency in existing electric hair clipper systems.

[0007] To address the problems of existing technologies, this invention provides an electric hair clipper, including a body, a fixed blade and a moving blade disposed at the head of the body, a permanent magnet disposed on the moving blade, and a first stator coil winding and a second stator coil winding arranged along the moving direction of the moving blade at the head of the body. The first stator coil winding and the second stator coil winding are located on both sides of the permanent magnet. In the working state, the current directions of the first stator coil winding and the second stator coil winding are opposite, and the energizing directions of the first stator coil winding and the second stator coil winding are reciprocating in opposite directions. The permanent magnet is driven by the magnetic field force on both sides to move the moving blade back and forth between the first stator coil winding and the second stator coil winding relative to the fixed blade.

[0008] Preferably, the machine body includes an electronic control unit and a battery module that can be coupled and connected to the electronic control unit. A mounting groove is provided on one side of the electronic control unit. A fixed blade is fixedly disposed in the mounting groove. A moving blade is slidably disposed on the fixed blade to cut hair alternately with the fixed blade. A permanent magnet is disposed on the fixed blade and slides in cooperation with the mounting groove. A first stator coil winding and a second stator coil winding are disposed in the mounting groove and located on both sides of the permanent magnet.

[0009] Preferably, the machine body extends along the direction of movement of the moving blade.

[0010] Preferably, the moving blade is floatingly mounted on the fixed blade, and the moving blade and the fixed blade are fitted with a clearance to form a floating gap.

[0011] Preferably, the body has an installation cavity, and the head of the body has a slot connecting the installation cavity and the floating gap. The installation cavity has an air inlet, and a small motor is installed inside the air inlet. A fan is installed on the small motor and the output shaft. When the output shaft of the small motor rotates, the fan rotates to guide outside air into the installation cavity.

[0012] Preferably, the body has an installation cavity, and the head of the body has a slot connecting the installation cavity and the floating gap. One side of the permanent magnet extends into the installation cavity to form a connection terminal. The installation cavity also has a sealing cavity, which has a first one-way port that penetrates the body and communicates with the atmosphere, and a second one-way port that communicates with the sealing cavity. A first piston is provided in the sealing cavity, which divides the sealing cavity into a first chamber and a second chamber. The first one-way port and the second one-way port communicate with the first chamber. The first piston can slide in the installation cavity along the moving direction of the moving blade. The first piston and the connection terminal are connected by transmission. When the moving blade moves relative to the fixed blade, the connection terminal drives the first piston to move in the sealing cavity to pump outside air into the installation cavity.

[0013] Preferably, the sealed cavity is further provided with a third one-way port communicating with the atmosphere and a fourth one-way port communicating with the installation cavity, and the third one-way port and the fourth one-way port are connected to the second chamber.

[0014] Preferably, a first sealing cylinder is provided in the mounting cavity, the inner cavity of the first sealing cylinder forms a sealing cavity, a first one-way valve is provided at the first one-way port to connect the outside atmosphere and the sealing cavity, a second one-way valve is provided at the second one-way port to connect the mounting cavity and the sealing cavity, a first one-way valve is provided at the third one-way port to connect the outside atmosphere and the sealing cavity, and a fourth one-way valve is provided at the fourth one-way port to connect the mounting cavity and the sealing cavity.

[0015] Preferably, a stroke amplifier is further provided between the connecting terminal and the first piston. The stroke amplifier has an input rod connected to the connecting terminal and an output rod connected to the first piston. When the connecting terminal moves in the direction within the mounting cavity, the stroke amplifier pushes the first piston to slide within the sealed cavity through the output rod. The stroke of the first piston is greater than the stroke of the connecting terminal.

[0016] Preferably, the stroke amplifier includes a second sealing cylinder fixedly disposed in the mounting cavity. One end of the second sealing cylinder is provided with a guide cylinder, one end of which extends into the second sealing cylinder and forms a communication port with the inner cavity of the second sealing cylinder. The other end of the guide cylinder extends out of the second sealing cylinder. One end of the input rod extends between the outer circumferential surface of the guide cylinder and the inner circumferential surface of the second sealing cylinder and is provided with a second piston. One end of the output rod extends into the guide cylinder and is provided with a third piston. A first pressure chamber communicating with the communication port is formed between the second piston, the outer circumferential surface of the guide cylinder, and the second sealing cylinder. A second pressure chamber communicating with the communication port is formed between the inner cavity of the guide cylinder and the third piston. Both the first and second pressure chambers are filled with hydraulic oil. The cross-sectional area of ​​the second pressure chamber is smaller than that of the first pressure chamber.

[0017] The advantages of this invention compared to the prior art are:

[0018] 1. This invention provides a permanent magnet on the moving blade, and a first stator coil winding and a second stator coil winding are respectively arranged on both sides of the permanent magnet along the sliding direction of the moving blade. When current is applied to the first stator coil winding and the second stator coil winding, the permanent magnet is driven by the magnetic field force on both sides to move the moving blade back and forth between the first stator coil winding and the second stator coil winding relative to the fixed blade. This causes the moving blade and the fixed blade to interlock to remove hair, which greatly improves the mechanical efficiency of the overall system and the efficiency of converting electrical energy into mechanical energy.

[0019] 2. By integrating the mechanism for driving the blade movement into the head of the machine body, the present invention eliminates the space for the motor inside the original machine body, making it possible to reduce the size of the overall handle part of the device.

[0020] 3. Because the mechanism for driving the blade movement is integrated into the head of the machine body, the position and direction of the electric push shear handle are relaxed and arranged horizontally. Users can easily meet the needs of precise blade movement by adjusting the wrist joint, making it more accurate to use. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the magnetic field when the moving blade of an electric clipper moves to the left.

[0022] Figure 2 This is a schematic diagram of the magnetic field when the moving blade of an electric clipper moves to the right.

[0023] Figure 3 This is an exploded perspective view of a second embodiment of an electric clipper.

[0024] Figure 4 yes Figure 3 A magnified view of part A.

[0025] Figure 5 This is a schematic diagram of the internal structure of a second embodiment of an electric clipper.

[0026] Figure 6 This is a cross-sectional view of the internal structure of a second embodiment of an electric clipper.

[0027] Figure 7 This is an exploded perspective view of the internal structure of a second embodiment of an electric clipper.

[0028] Figure 8 This is an exploded three-dimensional diagram of a stroke amplifier in an electric clipper.

[0029] Figure 9 This is a cross-sectional view of an electric clipper.

[0030] Figure 10 This is a schematic diagram of a first embodiment of an electric clipper.

[0031] The diagram is labeled as follows: 1. Body; 11. Electronic control unit; 12. Battery module; 13. Slot; 14. Air inlet; 151. First one-way port; 152. Second one-way port; 153. First chamber; 154. Second chamber; 155. Third one-way port; 156. Fourth one-way port; 16. First piston; 2. Fixed blade; 3. Moving blade; 4. Permanent magnet; 41. Connecting terminal; 5. First stator coil winding; 6. Second stator coil winding; 71. Motor; 72. Fan; 73. First sealing cylinder; 741. First one-way valve; 742. Second one-way valve; 743. Third one-way valve; 744. Fourth one-way valve; 751. Input rod; 752. Output rod; 753. Second sealing cylinder; 754. Guide cylinder; 755. Connecting port; 756. Second piston; 757. Third piston. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides:

[0034] An electric hair clipper includes a body 1, a fixed blade 2 and a moving blade 3 disposed at the head of the body 1. A permanent magnet 4 is disposed on the moving blade 3. The head of the body 1 is also provided with a first stator coil winding 5 and a second stator coil winding 6 arranged along the moving direction of the moving blade 3. The first stator coil winding 5 and the second stator coil winding 6 are located on both sides of the permanent magnet 4. In the working state, the current directions of the first stator coil winding 5 and the second stator coil winding 6 are opposite, and the energizing directions of the first stator coil winding 5 and the second stator coil winding 6 are reversed. The permanent magnet 4 is driven by the magnetic field force on both sides to move the moving blade 3 back and forth between the first stator coil winding 5 and the second stator coil winding 6 relative to the fixed blade 2.

[0035] The fixed blade 2 is a fixed blade located at the bottom of the blade stack structure. It is fixedly connected to the main body of the electric push shear and cannot be displaced. The moving blade 3 is located above the fixed blade 2, with its surfaces in contact with the fixed blade 2. The moving blade 3 has a protrusion on its underside, and the upper surface of the fixed blade 2 has a limiting groove. The protrusion of the moving blade 3 can be engaged in this limiting groove, providing a certain pulling force so that the moving blade 3 can adhere to the upper surface of the fixed blade 2, while also satisfying the requirement for open displacement in the lateral direction.

[0036] Above the moving blade 3, it is connected to the permanent magnet 4 by a fixed connection. The magnetic poles of the permanent magnet 4 are distributed in a transverse SN pattern.

[0037] Both the first stator winding 5 and the second stator winding 6 include a stator core and winding coils wound around the stator core. In actual implementations, the number of coils can be adjusted. The stator core is connected to the main body via a fixed connection.

[0038] During operation, energizing the left coil causes it to generate a power source similar to... Figure 1 The magnetic field of the SN poles is shown. Simultaneously, the right coil is energized, generating the magnetic field of the NS poles. The permanent magnet 4 will then be attracted to the left by the magnetic field generated by the left coil, while the magnetic field generated by the left coil will also push the permanent magnet 4 to the left, repelling it. Since the permanent magnet 4 and the moving blade 3 are fixedly connected, the moving blade 3 will move to the left (in the direction of the arrow) together with the permanent magnet 4.

[0039] Then, the direction of the current flowing through the two coils is changed. The left coil generates a magnetic field with N and S poles, and the right coil generates a magnetic field with SN poles. At this time, the magnetic field generated by the left coil will repel the permanent magnet 4 from moving to the right, and the magnetic field generated by the right coil will attract the permanent magnet 4 to move to the right. The permanent magnet 4 drives the moving blade 3 to move to the right together. By setting the frequency of the change in the direction of the coil current, the reciprocating lateral movement of the moving blade 3 can be completed, such as... Figure 2 As shown.

[0040] The magnetic field direction of the permanent magnet 4 can be adjusted by a certain angle, or multiple permanent magnets 4 with different magnetic poles can be connected by a fixed connection method. The coil settings can be increased or decreased according to the magnetic pole method.

[0041] In this embodiment, a permanent magnet 4 is set on the moving blade 3, and a first stator coil winding 5 and a second stator coil winding 6 are respectively set on both sides of the permanent magnet 4 along the sliding direction of the moving blade 3. When current is passed into the first stator coil winding 5 and the second stator coil winding 6, the permanent magnet 4 is driven by the magnetic field force on both sides to move the moving blade 3 back and forth between the first stator coil winding 5 and the second stator coil winding 6 relative to the fixed blade 2. This causes the moving blade 3 and the fixed blade 2 to interweave to detect hair, which greatly improves the mechanical efficiency of the overall system and the efficiency of converting electrical energy into mechanical energy.

[0042] like Figure 4 As shown, the body 1 includes an electronic control unit 11 and a battery module 12 that can be coupled and connected to the electronic control unit 11. A mounting groove is provided on one side of the electronic control unit 11. A fixed blade 2 is fixedly disposed in the mounting groove. A movable blade 3 is slidably disposed on the fixed blade 2 to cut hair alternately with the fixed blade 2. A permanent magnet 4 is disposed on the fixed blade 2 and slides in cooperation with the mounting groove. A first stator coil winding 5 and a second stator coil winding 6 are disposed in the mounting groove and located on both sides of the permanent magnet 4.

[0043] The battery module and the main body can be integrated into a single unit, meaning the battery is not removable. Alternatively, the battery module 12 can be connected to the main body via an interface (e.g., a USB-C interface), in which case the battery module 12 is removable.

[0044] Because the structure for driving the moving blade 3 is integrated into the head of the body 1, the position and direction of the electric push shear handle are relaxed and set to a horizontal arrangement. Users can easily meet the needs of precise blade movement by adjusting the wrist joint, making it more accurate to use.

[0045] like Figure 1 and Figure 2 As shown, the machine body 1 extends along the moving direction of the moving blade 3.

[0046] Currently, the physical three-dimensional structure of all electric clippers can be simply summarized as a through-type structure of "columnar structure + blade head". It can be figuratively compared to the structure of a conventional flashlight. The barber needs to hold the electric clippers and operate them on the customer.

[0047] A barber has three joints: the shoulder, elbow, and wrist. Of these, only the wrist joint offers a relatively large range of angular freedom of movement; the other joints can be considered to lack one of the three angular degrees of freedom (rotational degree of freedom). In most practical situations, when a barber uses electric clippers, the shoulder and elbow joints need to coordinate their movements to ensure the clippers remain close to the plane of the hair to be cut and to allow for displacement of the clippers relative to the hair, thus effectively trimming the hair on the curved surface of the head. Using the integral expression for the length of a single-variable circle or arc: length = radius * angle (π, a complete circle is 2π), it can be seen that even a slight change in joint angle can result in a significant displacement (hand position). This is especially true for barbers with greater height and arm span. However, for minute details, such as sideburns requiring finer touches, the human ability to precisely control joint angles is limited, making it difficult to achieve the required precise displacement through subtle adjustments in shoulder and elbow angles.

[0048] By positioning the battery module 12 and the electronic control unit 11 in the same direction as the moving blade 3, the barber can achieve precise blade movement through wrist control. Simultaneously, the first stator coil winding 5 and the second stator coil winding 6 are integrated into the head of the body 1, significantly reducing the space occupied by the electric clipper's power unit.

[0049] like Figure 9 As shown, the moving blade 3 is floatingly mounted on the fixed blade 2, and the moving blade 3 and the fixed blade 2 are fitted with a clearance to form a floating gap.

[0050] There is an extremely narrow gap between the moving blade 3 and the fixed blade 2 to prevent wear caused by sliding between the moving blade 3 and the fixed blade 2, which could lead to damage to the entire component.

[0051] like Figure 10 As shown, the body 1 is provided with an installation cavity, and the head of the body 1 is also provided with a slot 13 that connects the installation cavity and the floating gap. An air inlet 14 is provided on the installation cavity, and a small motor 71 is provided inside the air inlet 14. A fan 72 is provided on the small motor 71 and the output shaft. When the output shaft of the small motor 71 rotates, the fan 72 rotates to guide outside air into the installation cavity.

[0052] As a first embodiment of this application, since a permanent magnet 4 of a certain weight is provided on the moving blade 3, the floating gap between the moving blade 3 and the fixed blade 2 cannot be maintained. Therefore, a small motor 71 and a fan 72 are set in the mounting cavity. When the small motor 71 is started, the fan 72 rotates and guides the outside air into the mounting cavity, so that the pressure in the safety cavity is greater than the outside pressure. The body 1 is also provided with a slot 13 that connects the floating gap and the mounting cavity, so that the air in the safety cavity enters between the fixed blade 2 and the moving blade 3 through the slot 13, thereby slightly lifting the moving blade 3 relative to the fixed blade 2, thereby maintaining the floating gap and ensuring that the friction between the fixed blade 2 and the moving blade 3 is small. At the same time, the air in the floating gap is discharged outward, which can prevent hair from entering the floating gap.

[0053] like Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the body 1 is provided with an installation cavity, and the head of the body 1 is also provided with a slot 13 that connects the installation cavity and the floating gap. One side of the permanent magnet 4 extends into the installation cavity to form a connecting terminal 41. The installation cavity is also provided with a sealing cavity. The sealing cavity has a first one-way port 151 that penetrates the body 1 and communicates with the atmosphere, and a second one-way port 152 that communicates with the sealing cavity. A first piston 16 is provided in the sealing cavity. The first piston 16 divides the sealing cavity into a first chamber 153 and a second chamber 154. The first one-way port 151 and the second one-way port 152 communicate with the first chamber 153. The first piston 16 can slide in the installation cavity along the moving direction of the moving blade 3. The first piston 16 and the connecting terminal 41 are connected by transmission. When the moving blade 3 moves relative to the fixed blade 2, the connecting terminal 41 drives the first piston 16 to move in the sealing cavity to pump outside air into the installation cavity.

[0054] In a second embodiment of this application, when the moving blade 3 is sliding, the connecting terminal 41 can drive the first piston 16 to slide in the sealed cavity. When the first piston 16 squeezes the first chamber 153, the pressure of the first chamber 153 increases, and the air in the first chamber 153 is squeezed into the mounting cavity through the second one-way port 152, and then enters the floating gap through the slot 13. When the first piston 16 is reset, the pressure of the first chamber 153 decreases, so that outside air enters the first chamber 153 through the first one-way port 151, so that the air in the first chamber 153 can be squeezed into the mounting cavity during the reciprocating movement of the first piston 16.

[0055] like Figure 6 As shown, the sealed cavity is also provided with a third one-way port 155 that communicates with the atmosphere and a fourth one-way port 156 that communicates with the installation cavity. The third one-way port 155 and the fourth one-way port 156 communicate with the second chamber 154.

[0056] When the first piston 16 presses the first chamber 153, the pressure in the second chamber 154 decreases, allowing outside air to enter the second chamber 154. At the same time, the air in the first chamber 153 is forced into the mounting cavity. When the first piston 16 presses the second chamber 154, the pressure in the first chamber 153 decreases, allowing outside air to enter the first chamber 153. At the same time, the air in the second chamber 154 is forced into the mounting cavity, ensuring that air is always injected into the mounting cavity during the reciprocating movement of the first piston 16.

[0057] like Figure 6 As shown, a first sealing cylinder 73 is provided in the installation cavity, and the inner cavity of the first sealing cylinder 73 forms a sealing cavity. A first one-way valve 741 connecting the outside atmosphere and the sealing cavity is provided at the first one-way port 151. A second one-way valve 742 connecting the installation cavity and the sealing cavity is provided at the second one-way port 152. A first one-way valve 741 connecting the outside atmosphere and the sealing cavity is provided at the third one-way port 155. A fourth one-way valve 744 connecting the installation cavity and the sealing cavity is provided at the fourth one-way port 156.

[0058] By setting the first one-way valve 741, the second one-way valve 742, the third one-way valve 743 and the fourth one-way valve 744 on the first sealing cylinder 73, outside air can continuously enter the mounting cavity when the first piston 16 slides in the first sealing cylinder 73.

[0059] like Figure 5 and Figure 6As shown, a stroke amplifier is also provided between the connecting terminal 41 and the first piston 16. The stroke amplifier has an input rod 751 connected to the connecting terminal 41 and an output rod 752 connected to the first piston 16. When the connecting terminal 41 moves in the direction of the mounting cavity, the stroke amplifier pushes the first piston 16 to slide in the sealed cavity through the output rod 752. The movement stroke of the first piston 16 is greater than the movement stroke of the connecting terminal 41.

[0060] Because the sliding stroke of the moving blade 3 relative to the fixed blade 2 is relatively small, the sliding formation of the first piston 16 in the sealed cavity is small, resulting in a small amount of air entering the mounting cavity from the outside. Therefore, the stroke amplifier drive connection terminal 41 and the first piston 16 are connected so that when the connection terminal 41 drives the input rod 751 to slide, the output shaft drives the first piston 16 to move with a stroke greater than that of the connection terminal 41. This can improve the movement formation of the first piston 16 and increase the air intake of the mounting cavity.

[0061] like Figure 6 , Figure 7 and Figure 8 As shown, the stroke amplifier includes a second sealing cylinder 753 fixedly disposed in the mounting cavity. A guide cylinder 754 is disposed at one end of the second sealing cylinder 753. One end of the guide cylinder 754 extends into the second sealing cylinder 753 and forms a communication port 755 with the inner cavity of the second sealing cylinder 753. The other end of the guide cylinder 754 extends out of the second sealing cylinder 753. One end of the input rod 751 extends between the outer circumferential surface of the guide cylinder 754 and the inner circumferential surface of the second sealing cylinder 753 and is provided with a second piston 756. One end of the output rod 752 extends into the guide cylinder 754 and is provided with a third piston 757. A first pressure chamber communicating with the communication port 755 is formed between the second piston 756, the outer circumferential surface of the guide cylinder 754 and the second sealing cylinder 753. A second pressure chamber communicating with the communication port 755 is formed between the inner cavity of the guide cylinder 754 and the third piston 757. Hydraulic oil is filled into both the first pressure chamber and the second pressure chamber. The cross-sectional area of ​​the second pressure chamber is smaller than that of the first pressure chamber.

[0062] The connecting terminal 41 pushes the second piston 756 to slide between the outer circumferential surface of the guide cylinder 754 and the inner circumferential surface of the second sealing cylinder 753 via the input rod 751, thereby reducing the pressure in the first pressure chamber. The first and second pressure chambers are connected through the connecting port 755, which also reduces the pressure in the second pressure chamber. The oil in the second pressure chamber is drawn into the first pressure chamber, causing the third piston 757 to move towards the connecting terminal 41 within the guide cylinder 754. Since the cross-sectional area of ​​the second pressure chamber is smaller than that of the first pressure chamber, more hydraulic oil in the first pressure chamber is drawn into it, resulting in a greater change in the third piston 757 than that of the second piston 756. This increases the change in the output rod 752 and improves the stroke of the first piston 16 within the sealing chamber.

[0063] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. An electric hair clipper, comprising a body, and a fixed blade and a moving blade disposed at the head of the body, characterized in that, A permanent magnet is installed on the moving blade, and the head of the machine body is also equipped with a first stator coil winding and a second stator coil winding arranged along the moving blade's direction of movement. The first stator coil winding and the second stator coil winding are located on both sides of the permanent magnet. In the working state, the current directions of the first stator coil winding and the second stator coil winding are opposite, and the energizing directions of the first stator coil winding and the second stator coil winding are reciprocating in opposite directions. The permanent magnet is driven by the magnetic field force on both sides to move the moving blade back and forth between the first stator coil winding and the second stator coil winding relative to the fixed blade. The moving tool is floatingly mounted on the fixed tool, and the moving tool and the fixed tool are fitted with a clearance to form a floating clearance. The body has an installation cavity, and the head of the body has a slot connecting the installation cavity and the floating gap. One side of the permanent magnet extends into the installation cavity to form a connection terminal. The installation cavity also has a sealing cavity, which has a first one-way port that penetrates the body and communicates with the atmosphere, and a second one-way port that communicates with the sealing cavity. A first piston is provided in the sealing cavity, which divides the sealing cavity into a first chamber and a second chamber. The first one-way port and the second one-way port communicate with the first chamber. The first piston can slide in the installation cavity along the moving direction of the moving blade. The first piston and the connection terminal are connected by transmission. When the moving blade moves relative to the fixed blade, the connection terminal drives the first piston to move in the sealing cavity to pump outside air into the installation cavity.

2. The electric hair clipper according to claim 1, characterized in that, The machine body includes an electronic control unit and a battery module that can be coupled and connected to the electronic control unit. A mounting groove is provided on one side of the electronic control unit. A fixed blade is fixedly installed in the mounting groove, and a moving blade is slidably installed on the fixed blade to cut hair alternately with the fixed blade. A permanent magnet is installed on the fixed blade and slides in cooperation with the mounting groove. A first stator coil winding and a second stator coil winding are installed in the mounting groove and located on both sides of the permanent magnet.

3. The electric hair clipper according to claim 1, characterized in that, The machine body extends along the direction of movement of the moving blade.

4. The electric hair clipper according to claim 1, characterized in that, The sealed cavity is also provided with a third one-way port that communicates with the atmosphere and a fourth one-way port that communicates with the installation cavity. The third one-way port and the fourth one-way port communicate with the second chamber.

5. An electric hair clipper according to claim 4, characterized in that, The mounting cavity is provided with a first sealing cylinder, the inner cavity of the first sealing cylinder forms a sealing cavity, a first one-way valve is provided at the first one-way port to connect the outside atmosphere and the sealing cavity, a second one-way valve is provided at the second one-way port to connect the mounting cavity and the sealing cavity, a first one-way valve is provided at the third one-way port to connect the outside atmosphere and the sealing cavity, and a fourth one-way valve is provided at the fourth one-way port to connect the mounting cavity and the sealing cavity.

6. An electric hair clipper according to claim 1, 4, or 5, characterized in that, A stroke amplifier is also provided between the connecting terminal and the first piston. The stroke amplifier has an input rod connected to the connecting terminal and an output rod connected to the first piston. When the connecting terminal moves in the direction of the mounting cavity, the stroke amplifier pushes the first piston to slide in the sealed cavity through the output rod. The stroke of the first piston is greater than the stroke of the connecting terminal.

7. An electric hair clipper according to claim 6, characterized in that, The travel amplifier includes a second sealed cylinder fixedly disposed in a mounting cavity. One end of the second sealed cylinder is provided with a guide cylinder, one end of which extends into the second sealed cylinder and forms a communication port with the inner cavity of the second sealed cylinder. The other end of the guide cylinder extends out of the second sealed cylinder. One end of the input rod extends between the outer circumferential surface of the guide cylinder and the inner circumferential surface of the second sealed cylinder and is provided with a second piston. One end of the output rod extends into the guide cylinder and is provided with a third piston. A first pressure chamber communicating with the communication port is formed between the second piston, the outer circumferential surface of the guide cylinder, and the second sealed cylinder. A second pressure chamber communicating with the communication port is formed between the inner cavity of the guide cylinder and the third piston. Both the first and second pressure chambers are filled with hydraulic oil. The cross-sectional area of ​​the second pressure chamber is smaller than that of the first pressure chamber.

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