Linear power machine and power tool with active heat dissipation

Abstract

The application discloses a linear power machine and power tool which can actively dissipate heat. The linear power machine comprises a stator assembly and a rotor assembly. The stator assembly is provided with coaxial support positioning members at both ends. The rotor assembly moves linearly in the stator assembly and the support positioning members. The rotor assembly has a hollow rotor support member through which fluid can flow. One end of the rotor support member is provided with a cross-section changing member, and the other end is an opening which is in communication with the outside. The cross-section changing member has a flow passage which is in communication with the outside. The flow passage has a flow cross-section which is smaller than the flow cross-section inside the rotor assembly. The inside and outside of the cross-section changing member form a pressure difference along with the movement of the rotor assembly, so that the flow passage keeps fluid flowing. The cross-section changing member is arranged to keep fluid flowing in the inside of the rotor assembly or between the rotor assembly and the stator assembly, so that the linear power machine can dissipate heat and prolong the service life.

Description

Technical Field

[0001] This invention relates to the field of power tool technology, and more specifically to a linear power machine with active heat dissipation and a power tool having the heat dissipation mechanism. Background Technology

[0002] Linear motors are a newly developed direct drive technology that offers superior linear motion compared to rotary motors with linear conversion mechanisms. Due to their outstanding advantages such as zero transmission chain, no contact, no backlash, high rigidity, and rapid response, linear motors are gradually replacing rotary motors with conversion mechanisms.

[0003] However, like other types of motors, linear motors inevitably experience various electrical and mechanical losses during use. The vast majority of these losses are converted into heat, accumulating within the motor and causing its temperature to rise. If the heat dissipation problem of linear motors is not properly addressed, poor heat dissipation will lead to prolonged periods of excessively high operating temperatures. During use, the motor, due to inadequate heat dissipation, will operate at high temperatures for extended periods, reaching or even exceeding the temperature resistance limit of the insulation material. This causes irreversible damage to the insulation, severely impacting electrical performance and resulting in a persistently high failure rate for linear motors.

[0004] Therefore, effectively reducing the operating temperature of the motor and adopting effective heat dissipation methods are essential for ensuring the long-term stable operation of the motor. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a linear power machine and power tool with active heat dissipation.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] An actively heat-dissipating linear motor includes a stator assembly and a mover assembly. The stator assembly has coaxial support and positioning components at both ends. The mover assembly performs linear reciprocating motion within the stator assembly and the support and positioning components. The mover assembly has a hollow mover support component that allows fluid flow, with a cross-sectional change component at one end and an opening communicating with the outside at the other end. The cross-sectional change component has a flow port communicating with the outside, and the flow cross-section of the flow port is smaller than the flow cross-section inside the mover assembly. A pressure difference is formed between the inside and outside of the cross-sectional change component as the mover assembly moves, maintaining fluid flow within the flow port.

[0008] Preferably, the moving part support moves synchronously with the moving part assembly, the hollow core of the moving part support forms a flow channel, the cross-sectional change member is disposed at the first end of the moving part support and is connected to the flow channel, and the opening is disposed at the second end of the moving part support.

[0009] Preferably, the flow port is a through hole located at the center of the cross-section changing member, and the diameter of the through hole is smaller than the flow cross-section of the flow pipe.

[0010] Preferably, the flow port consists of a flow pipe and a one-way valve. The flow pipe is located at the axis of the cross-sectional change member, and the diameter of the flow pipe is smaller than that of the flow pipe. The one-way valve is located inside the flow pipe and allows fluid to be output from the flow pipe to the outside of the flow pipe.

[0011] Preferably, a wear-resistant member is provided between the ends of the cross-section changing member and the moving part assembly, and between the second end and the end of the moving part assembly. The wear-resistant member is sleeved on the moving part support member and moves synchronously with the moving part assembly through the cross-section changing member and the second end.

[0012] Preferably, the wear-resistant part near the moving part assembly slides in contact with the inner wall of the support and positioning part.

[0013] An actively heat-dissipating linear motor includes a stator assembly and a mover assembly. The stator assembly has hollow supporting and positioning components at both ends. The mover assembly performs linear reciprocating motion within the stator assembly and the supporting and positioning components. One end of the mover assembly has a cross-sectional changing component. The outer diameter of the cross-sectional changing component is larger than that of the mover assembly but smaller than the internal cross-sectional dimension of the supporting and positioning component or the linear motor housing. A first cavity and a second cavity are formed between the two ends of the mover assembly and the supporting and positioning component. The end of the supporting and positioning component has a vent hole communicating with the first cavity. The gap between the stator assembly and the mover assembly, or the gap between the stator assembly and the linear motor housing, communicates with the first cavity and creates a pressure difference with the outside of the supporting and positioning component as the cross-sectional changing component moves, thus maintaining fluid flow inside and outside the supporting and positioning component.

[0014] Preferably, the support positioning member is provided with a flow hole communicating with the outside, and the flow hole is connected to the gap.

[0015] Preferably, a sliding part is provided between the two support positioning members, and the moving part is slidably sleeved on the sliding part and slides relative to the stator assembly.

[0016] Power tools, including linear power machines with active cooling as described above.

[0017] The beneficial effects of this invention are mainly reflected in:

[0018] 1. By setting up cross-sectional changing components, a pressure difference is formed inside or outside the moving part assembly as the moving part assembly reciprocates. This allows fluid to flow inside the moving part assembly or in the gap between the moving part assembly and the stator assembly. The continuous flow of fluid dissipates heat in a timely manner, thereby reducing the internal temperature of the linear motor during operation and extending its service life.

[0019] 2. The first and second embodiments generate a pressure difference by moving and changing the cross-sectional area of ​​the fluid between the component and the flow pipe, thereby driving the rapid flow of fluid inside the moving part assembly to dissipate heat quickly, using a linear motor for the fluid; the third embodiment directly uses the movement of the component to keep the gap between the moving part assembly and the stator assembly or the gap between the housing and the outer diameter of the stator flowing to dissipate heat quickly.

[0020] 3. In the third embodiment, a sliding part is provided to improve the stability of the sliding of the mover assembly relative to the stator assembly;

[0021] 4. The third embodiment can combine the heat dissipation methods of the first or second embodiment to achieve the best heat dissipation effect.

[0022] 5. This invention provides a variety of feasible embodiments to adapt to different power tools, and has great practicality and a wide range of applications. Attached Figure Description

[0023] The technical solution of the present invention will be further described below with reference to the accompanying drawings:

[0024] Figure 1 : A schematic diagram of the first embodiment of the present invention;

[0025] Figure 2 : A schematic diagram of the second embodiment of the present invention;

[0026] Figure 3 : Schematic diagram in the third embodiment of the present invention. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0028] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0029] The active cooling mechanism for linear power machines disclosed in this invention will be described below with reference to the accompanying drawings. It can be applied to linear working machines in the power tool industry, home appliance industry, toy industry, and some industrial sectors, such as electric nail guns, rivet guns, glue guns, jigsaws, reciprocating saws, electric picks, etc.

[0030] This technical solution is mainly aimed at linear motors and electromagnets with cylindrical and square closed magnetic circuits, with a preference for linear motors with cylindrical closed magnetic circuits.

[0031] like Figures 1 to 3 As shown, this invention discloses three embodiments of a linear power machine capable of active heat dissipation, wherein... Figure 1 In a first embodiment of the present invention, a stator assembly 1 and a mover assembly 2 are included. The stator assembly 1 has coaxial support and positioning members 3 at both ends. The mover assembly 2 performs linear reciprocating motion within the stator assembly 1 and the support and positioning members 3. The mover assembly 2 has a hollow mover support member 4 that allows fluid to flow through it, and a cross-sectional changing member 5 is fixed to one end of the support member 4. The other end is an opening communicating with the outside. The cross-sectional changing member 5 has a flow port communicating with the outside, and the flow cross-section of the flow port is smaller than the flow cross-section inside the mover assembly 2. A pressure difference is formed between the inside and outside of the cross-sectional changing member 5 as the mover assembly 2 moves, so that fluid continues to flow within the flow port.

[0032] Specifically, the mover support 4 moves synchronously with the mover assembly 2. The hollow core of the mover support 4 forms a flow channel 404. The cross-sectional changing member 5 is disposed at the first end 401 of the mover support 4 and communicates with the flow channel 404. The opening is disposed at the second end 402 of the mover support 4. The outer diameter of the cross-sectional changing member 5 and the outer diameter of the second end 402 are opposite and are respectively larger than the outer diameter of the rod portion 403, so that a piston structure is formed between the two ends of the mover assembly 2 and the support positioning member 3, creating a pressure difference. The mover support 4 is made of a non-magnetic material, such as aluminum alloy, stainless steel, carbon fiber, etc. Aluminum alloy material is preferred, such as 7075 aluminum alloy, 6061 aluminum alloy, etc.

[0033] like Figure 1 As shown, the flow port is a through hole 501 located at the axis of the cross-section changing member 5, and the diameter of the through hole 501 is smaller than the flow cross-section of the flow pipe 404. The diameter of the through hole 501 is preferably half the diameter of the flow pipe 404 to maximize heat dissipation. In other feasible embodiments, other suitable ratios can be used between the diameter of the through hole 501 and the flow pipe 404. This structure creates a pressure difference between the inside and outside of the cross-section changing member 5 as the moving part 2 moves. This pressure difference causes fluid to flow through the through hole 501, thereby accelerating heat diffusion, achieving heat dissipation, and extending its service life. Furthermore, in other feasible embodiments, the cross-section changing member 5 can be provided at both ends of the moving part support 4.

[0034] Furthermore, a wear-resistant component 6 is respectively provided between the ends of the cross-section changing component 5 and the moving part assembly 2, and between the second end 402 and the end of the moving part assembly 2. The wear-resistant component 6 is sleeved on the moving part support 4 and is fixedly connected to the moving part assembly 2 through the cross-section changing component 5 and the second end 402, allowing for synchronous movement. The wear-resistant component 6 ensures the connection stability between the moving part assembly 2 and the moving part support 4, enabling them to move as a single unit. The wear-resistant component 6 is made of a lightweight, wear-resistant, non-magnetic material, preferably ceramic.

[0035] There is a gap between the wear-resistant part 6 and the support and positioning part 3, and the portion of the wear-resistant part 6 near the moving part assembly 2 slides in contact with the inner wall of the support and positioning part 3. This structural arrangement reduces the contact area between the wear-resistant part 6 and the support and positioning part 3, reduces excessive wear between them, improves service life, and enhances the smoothness of sliding between them.

[0036] To further improve the smoothness of movement of the moving part assembly 2 and the moving part support 4, lubricating powder 7 is provided on the inner wall of the support positioning sleeve 3. The lubricating powder 7 is preferably graphite lubricating powder.

[0037] like Figure 2 The second embodiment of the present invention is shown. The general structure of the second embodiment is the same as that of the first embodiment, except that the structure of the flow port is different.

[0038] Specifically, the flow port consists of a flow pipe 502 and a one-way valve 503. The flow pipe 502 is located at the axis of the cross-section changing member 5, and the diameter of the flow pipe 502 is smaller than that of the flow pipe 404. The one-way valve 503 is located inside the flow pipe 502, allowing fluid to be output from the flow pipe 404 to the outside of the flow pipe 502.

[0039] In the second embodiment, a one-way valve 503 is installed inside the flow port. This structure allows the fluid in the flow pipe 404 to flow in one direction, further increasing the fluid cross-sectional difference between the flow port and the flow pipe 404. This improves heat dissipation while reducing overall weight and cost. Of course, in other feasible embodiments, the cross-sectional variation member 5 can be installed on both ends of the moving element support 4 for rapid heat dissipation.

[0040] Both the first and second embodiments described above use a cross-sectional change member 5 with a fluid cross-sectional difference between it and the flow pipe 404 to generate a pressure difference between the inside and outside of the cross-sectional change member 5 when the mover assembly 2 moves, thereby promoting the rapid flow of fluid inside the mover assembly 2 for rapid heat dissipation. Such a heat dissipation structure is more suitable for linear motors that use fluid.

[0041] like Figure 3 As shown, this is the third embodiment of the present invention. Specifically, it includes a stator assembly 1 and a mover assembly 2. The stator assembly 1 has hollow support and positioning members 3 at both ends. The mover assembly 2 performs linear reciprocating motion within the stator assembly 1 and the support and positioning members 3. One end of the mover assembly 2 is provided with a cross-sectional changing member 5. The outer diameter of the cross-sectional changing member 5 is larger than that of the mover assembly 2 and smaller than the internal cross-sectional dimension (width) of the support and positioning member 3. A first cavity 100 and a second cavity 200 are formed between the two ends of the mover assembly 2 and the support and positioning member 3. The end of the support and positioning member 3 has a vent hole 8 communicating with the first cavity 100. The gap 300 between the second cavity 200, the stator assembly 1, and the mover assembly 2 is connected to the first cavity 100. As the cross-sectional changing member 5 moves, a pressure difference is formed between it and the outside of the support and positioning member 3, so that fluid flows inside and outside the support and positioning member 3.

[0042] Of course, the cross-section changing member 5 can also be directly fitted with the linear motor housing. The outer diameter of the cross-section changing member 5 is larger than that of the mover assembly 2 and smaller than the internal cross-sectional dimension (width) of the linear motor housing. The two ends of the mover assembly 2 form a first cavity 100 and a second cavity 200 between the support positioning member 3 or the linear motor housing. The gap 300 between the second cavity 200, the stator assembly 1 and the linear motor housing is connected to the first cavity 100. As the cross-section changing member 5 moves, a pressure difference is formed with the outside of the support positioning member 3, so that fluid flows inside and outside the support positioning member 3.

[0043] The biggest difference between the third embodiment and the first and second embodiments is that the mover assembly 2 in the first and second embodiments is a hollow structure, mainly relying on its internal structure for active heat dissipation. In the third embodiment, the mover assembly 2 can be either hollow or solid. It is directly connected to the cross-sectional change member 5, and the movement of both maintains fluid flow between the mover assembly 2 and the stator assembly 1, achieving rapid heat dissipation. The third embodiment expands the applicability of the first and second embodiments, particularly suitable for linear motors with a solid mover assembly 3. Furthermore, in the third embodiment, if the mover assembly 2 is hollow, it can be combined with the internal heat dissipation method of the mover assembly 2 in the first and / or second embodiments, allowing heat dissipation both inside the mover assembly 2 and in the gap between it and the stator assembly 1 as the mover assembly 2 moves, maximizing the heat dissipation effect.

[0044] In this embodiment, a sliding portion 11 may be provided between the two supporting positioning members 3. The moving part 2 is slidably sleeved on the sliding portion 11 and slides relative to the stator assembly 1 to improve the stability of the movement of the moving part 2. The sliding portion 11 is preferably a fixed shaft, preferably a hollow structure, to reduce the overall weight and manufacturing cost. In other feasible embodiments, the sliding portion 11 may also be a solid structure to enhance its rigidity. In another feasible embodiment, the sliding portion 11 may not be provided.

[0045] The support positioning member 3 is provided with a flow hole 10 communicating with the outside, and the flow hole 10 is connected to the gap 300. The flow hole 10 allows the fluid in the gap 300 and the first cavity 100 to be rapidly exchanged with the external fluid when the moving part assembly 2 moves, thereby accelerating the flow rate between the second cavity 200, the gap 300 and the first cavity 100 and the external fluid, and further improving the heat dissipation efficiency.

[0046] To ensure the connection stability between the moving part 2 and the cross-section changing member 5, in this preferred embodiment, the cross-section changing member 5 passes through the shaft core of the moving part 2 and is integrated with it. In other feasible embodiments, the cross-section changing member 5 may also be provided only at the end of the moving part 2.

[0047] Furthermore, to improve the smoothness of sliding between the mover assembly 2 and the mover support 4, lubricating powder 7 is provided on the outer wall of the sliding part 11. The lubricating powder 7 is preferably graphite lubricating powder.

[0048] To improve the service life of the moving part assembly 2, elastic shock-absorbing pads 9 are provided at both the front and rear ends of the moving part assembly 2. The shock-absorbing pads 9 are made of an elastic material, such as rubber. The shock-absorbing pads 9 can buffer the moving part assembly 2, thereby reducing the impact on the inner end of the support positioning sleeve 3 caused by the forward and backward movement of the moving part assembly 2, thus reducing wear, improving the overall service life, and reducing the noise generated by the moving part assembly 2.

[0049] This solution further discloses power tools, including housings and other power tools such as electric nail guns, rivet guns, glue guns, jigsaws, reciprocating saws, electric picks, etc., and other structures such as circuit boards, start / stop components, power supplies, etc. The structures of the corresponding power tools are known technologies and will not be described in detail here. The innovation of the power tools in this solution is to provide the above-described active heat dissipation linear motors to replace some linear motor drive mechanisms that do not use fluid or partially use fluid, thereby reducing the temperature generated during use, maintaining the normal operation of the overall equipment, extending service life, reducing noise, and reducing unnecessary wear.

[0050] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0051] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A linear motor with active heat dissipation, comprising a stator assembly (1) and a mover assembly (2), wherein the stator assembly (1) is provided with hollow support and positioning members (3) at both ends, and the mover assembly (2) performs linear reciprocating motion within the stator assembly (1) and the support and positioning members (3), characterized in that: One end of the mover assembly (2) is provided with a cross-section changing member (5), the outer diameter of the cross-section changing member (5) is greater than the mover assembly (2) and less than the internal cross-section size of the support positioning member (3) or the linear motor housing, the two ends of the mover assembly (2) and the support positioning member (3) or the linear motor housing form a first cavity (100) and a second cavity (200), the end of the support positioning member (3) has a vent hole (8) communicating with the first cavity (100), the gap (300) between the stator assembly (1) and the mover assembly (2) or the gap (300) between the stator assembly (1) and the linear motor housing is connected with the first cavity (100) and communicates with the first cavity (100), and the gap (300) moves with the support positioning member (3) to form a pressure difference with the outside of the support positioning member (3), so that the inside and outside of the support positioning member (3) keep fluid flow; the cross-section changing member (5) has a flow-through port communicating with the outside, and the flow-through cross-section of the flow-through port is smaller than the flow-through cross-section inside the mover assembly (2), and the pressure difference makes the flow-through port keep fluid flow.

2. The actively heat-dissipating linear motor according to claim 1, characterized in that: The support positioning member (3) or the linear motor housing is provided with a flow-through hole (10) communicating with the outside, and the flow-through hole (10) communicates with the gap (300).

3. The actively heat-dissipating linear motor according to claim 1, characterized in that: Two support positioning members (3) are provided with a sliding part (11), and the mover assembly (2) is slidably sleeved on the sliding part (11) and slides relative to the stator assembly (1).

4. A power tool characterized by: The linear motor capable of actively dissipating heat comprises the linear motor capable of actively dissipating heat as claimed in any one of claims 1-3.

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