CN113054798A

CN113054798A - Linear power machine capable of actively dissipating heat and power tool

Info

Publication number: CN113054798A
Application number: CN202110361131.2A
Authority: CN
Inventors: 胡方坤
Original assignee: Suzhou Pinjiang Electromechanical Technology Co ltd
Current assignee: Suzhou Pinjiang Electromechanical Technology Co ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2021-06-29

Abstract

The invention discloses a linear power machine and a power tool capable of actively dissipating heat, which comprise a stator assembly and a rotor assembly, wherein two ends of the stator assembly are respectively provided with a supporting positioning piece coaxial with the stator assembly, the rotor assembly linearly reciprocates in the stator assembly and the supporting positioning piece, the rotor assembly is provided with a hollow rotor supporting piece capable of circulating fluid, one end of the rotor assembly is provided with a section changing piece, the other end of the rotor assembly is provided with an opening communicated with the outside, the section changing piece is provided with a circulation opening communicated with the outside, the circulation section of the circulation opening is smaller than the circulation section in the rotor assembly, and the inside and the outside of the section changing piece form pressure difference along with the movement of the rotor assembly, so that the fluid flow in the circulation opening is kept. The invention is provided with the section changing piece, thereby keeping fluid flow inside the rotor assembly or between the rotor assembly and the stator assembly for heat dissipation, and prolonging the service life of the rotor assembly.

Description

Linear power machine capable of actively dissipating heat and power tool

Technical Field

The invention relates to the technical field of electric tools, in particular to a linear power machine capable of actively dissipating heat and a power tool with the heat dissipation mechanism.

Background

The linear motor is a new type of direct drive technology developed recently, and is superior to a linear motion formed by a rotating motor and a linear conversion mechanism. Because the linear motor has the outstanding advantages of zero transmission chain, no contact, no reverse clearance, high rigidity, quick response and the like, the linear motor is gradually replacing a rotating motor and a switching mechanism.

However, linear motors, like other types of motors, inevitably generate various electrical and mechanical losses during use, and most of the losses are converted into heat energy which is accumulated in the motor, resulting in the temperature rise of the motor. If the heat dissipation problem of the linear motor is not solved, the long-term working temperature of the motor is overhigh due to poor heat dissipation. In the use process, the motor is in a high-temperature working state for a long time due to poor heat dissipation, the temperature resistance limit of an insulating material is reached or even exceeded, irreversible damage is caused to the insulating material, adverse effects are generated on electrical performance, and the fault rate of the linear motor is always high.

Therefore, the working temperature of the motor is effectively reduced, and the motor stably works for a long time by determining an effective heat dissipation mode.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide a linear power machine and a power tool capable of actively dissipating heat.

The purpose of the invention is realized by the following technical scheme:

but radiating linear power machine initiatively, including stator module and active cell subassembly, stator module's both ends are provided with coaxial support setting element with it respectively, active cell subassembly is in be straight reciprocating motion in stator module, the support setting element, active cell subassembly has the hollow active cell support piece of circulated fluid, and its one end is provided with a cross section change spare, and the other end is the opening with outside intercommunication, cross section change spare has the circulation mouth with outside intercommunication, just the circulation cross section of circulation mouth is less than the inside circulation cross section of active cell subassembly, the inside and outside along with active cell subassembly's removal forms pressure differential, makes keep fluid flow in the circulation mouth.

Preferably, the mover support moves synchronously with the mover assembly, a flow passage is formed in a hollow core of the mover support, the section changing member is disposed at a first end of the mover support and is communicated with the flow passage, and the opening is disposed at a second end of the mover support.

Preferably, the circulation port is a through hole provided at an axial center of the cross-section changing member, and a diameter of the through hole is smaller than a circulation cross-section of the circulation pipe.

Preferably, the circulation port includes a circulation pipe disposed at an axial center of the cross-section changing member and having a smaller diameter than the circulation pipe, and a check valve disposed inside the circulation pipe and configured to allow the fluid to be discharged from the circulation pipe to the outside of the circulation pipe.

Preferably, wear-resistant parts are respectively arranged between the end parts of the section changing part and the mover assembly and between the second end and the end part of the mover assembly, and the wear-resistant parts are sleeved on the mover supporting part and synchronously move with the mover assembly through the section changing part and the second end.

Preferably, a portion of the wear-resistant member, which is close to the mover assembly, is in sliding contact with an inner wall of the supporting and positioning member.

The linear power machine capable of actively dissipating heat comprises a stator component and a rotor component, wherein two ends of the stator component are respectively provided with a supporting positioning part with a hollow interior, the rotor component makes linear reciprocating motion in the stator component and the supporting positioning part, one end of the rotor component is provided with a section changing part, the outer diameter of the section changing part is larger than that of the rotor component and smaller than the supporting positioning part or the internal section size of a casing of the linear power machine, a first cavity and a second cavity are formed between two ends of the rotor component and the supporting positioning part, the end part of the supporting positioning part is provided with a vent hole communicated with the first cavity, a gap between the stator component and the rotor component or a gap between the stator component and the casing of the linear power machine is communicated with the first cavity, and a pressure difference is formed between the stator component and the outside of the supporting positioning part along with the movement of, such that fluid flow is maintained between the interior and exterior of the support and positioning member.

Preferably, the supporting and positioning part is provided with a circulation hole communicated with the outside, and the circulation hole is communicated with the gap.

Preferably, a sliding part is arranged between the two supporting and positioning parts, and the mover assembly is slidably sleeved on the sliding part and slides relative to the stator assembly.

The power tool comprises the linear power machine capable of actively dissipating heat.

The invention has the following beneficial effects:

1. the section changing part is arranged, so that pressure difference is formed between the inside or the outside of the rotor assembly along with the reciprocating motion of the rotor assembly, the fluid flow is kept in the inside of the rotor assembly or a gap between the rotor assembly and the stator assembly, heat dissipation is timely performed through the continuous flow of the fluid, the internal temperature of the linear motor during working is reduced, and the service life of the linear motor is prolonged;

2. the first and the second embodiments are linear motors using fluid, which generate pressure difference by moving and fluid section difference between a section changing member and a flow pipe, thereby pushing the fluid inside the mover assembly to flow rapidly to dissipate heat rapidly; the third embodiment is that the gap between the mover component and the stator component or the gap between the casing and the outer diameter of the stator keeps the fluid flowing directly through the movement of the section changing piece to quickly dissipate heat;

3. the sliding part is arranged in the third embodiment to improve the stability of the sliding of the rotor component relative to the stator component;

4. the third embodiment can combine the heat dissipation method of the first or second embodiment to achieve the best heat dissipation effect.

5. The invention provides various feasible embodiments to adapt to different electric tools, and has great practicability and wider application range.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1: a schematic diagram of a first embodiment of the invention;

FIG. 2: a schematic diagram of a second embodiment of the invention;

FIG. 3: a third embodiment of the present invention is schematically illustrated.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

The active heat dissipation mechanism of the linear power machine disclosed by the invention is explained below by combining with the attached drawings, and can be applied to the fields of linear working machines such as electric nail guns, rivet guns, glue guns, jig saws, reciprocating saws, electric picks and the like in the electric tool industry, the household appliance industry, the toy industry, part of industries and the like.

The technical scheme is mainly used for linear motors and electromagnet linear power machines with cylindrical and square closed magnetic circuits, and the cylindrical closed magnetic circuit linear power machine is preferentially formed.

As shown in fig. 1 to 3, the present invention discloses three embodiments of a linear power machine capable of actively dissipating heat, wherein, fig. 1 is a first embodiment of the present invention, which comprises a stator assembly 1 and a mover assembly 2, two ends of the stator assembly 1 are respectively provided with a supporting and positioning member 3 coaxial therewith, the rotor assembly 2 makes linear reciprocating motion in the stator assembly 1 and the supporting and positioning part 3, the rotor assembly 2 is provided with a hollow rotor support 4 capable of flowing fluid, and one end of the cross section changing piece is fixedly connected with a cross section changing piece 5, the other end of the cross section changing piece is provided with an opening communicated with the outside, the cross section changing piece 5 is provided with a circulation port communicated with the outside, and the flow section of the flow port is smaller than the flow section inside the mover assembly 2, and the inside and the outside of the section changing member 5 form a pressure difference with the movement of the mover assembly 2, so that the fluid flow is maintained in the flow port.

Specifically, the mover support 4 moves synchronously with the mover assembly 2, the shaft core of the mover support 4 is hollow to form a flow channel 404, the section changing member 5 is disposed at a first end 401 of the mover support 4 and is communicated with the flow channel 404, and the opening is disposed at a second end 402 of the mover support 4. The outer diameter of the section changing member 5 is opposite to the outer diameter of the second end 402, and is respectively greater than the outer diameter of the rod part 403, so that a piston structure is formed between the two ends of the mover assembly 2 and the supporting and positioning member 3, and a pressure difference is formed. The rotor support 4 is made of non-magnetic materials, such as aluminum alloy, stainless steel, carbon fiber and the like. Aluminum alloy materials such as 7075 aluminum alloy, 6061 aluminum alloy, and the like are preferred.

As shown in fig. 1, the flow passage is a through hole 501 provided at the axial center 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 aperture of the through hole 501 is preferably one half of the pipe diameter of the circulation pipe 404 to maximize the heat dissipation effect. In other possible embodiments, other suitable ratios between the aperture of the through hole 501 and the flow channel 404 may be used. Due to the structure, pressure difference is formed between the inside and the outside of the section changing piece 5 along with the movement of the rotor assembly 2, and fluid can flow through the through holes 501 due to the pressure difference, so that the heat diffusion is accelerated, the heat dissipation purpose is achieved, and the service life of the heat dissipation device is prolonged. And in other possible embodiments, both ends of the mover support 4 may be provided with the section changing member 5.

Further, wear-resistant members 6 are respectively disposed between the end portions of the section changing member 5 and the mover assembly 2 and between the second end 402 and the end portion of the mover assembly 2, and the wear-resistant members 6 are sleeved on the mover support 4 and are fixedly connected with the mover assembly 2 through the section changing member 5 and the second end 402 to perform synchronous movement. The arrangement of the wear-resistant pieces 6 ensures the connection stability between the mover assembly 2 and the mover support 4, so that the two move integrally. The wear part 6 is made of a light wear-resistant non-magnetically conductive material, preferably ceramic.

A gap exists between the wear-resistant part 6 and the supporting and positioning part 3, and the part of the wear-resistant part 6 close to the rotor assembly 2 is in sliding contact with the inner wall of the supporting and positioning part 3. The structural arrangement reduces the contact area between the wear-resistant part 6 and the supporting and positioning part 3, reduces excessive wear between the wear-resistant part and the supporting and positioning part, prolongs the service life, and can improve the smoothness of sliding between the wear-resistant part and the supporting and positioning part.

In order to further improve the moving fluency of the rotor assembly 2 and the rotor support 4, lubricating powder 7 is arranged on the inner wall of the supporting and positioning sleeve 3. The lubricating powder 7 is preferably graphite lubricating powder.

Fig. 2 shows a second embodiment of the present invention, which has the same general structure as the first embodiment, except that the structure of the communication port is different.

Specifically, the circulation port is composed of a circulation pipe 502 and a check valve 503, the circulation pipe 502 is disposed at the axial center of the cross-section changing member 5, the pipe diameter of the circulation pipe 502 is smaller than that of the circulation pipe 404, and the check valve 503 is disposed inside the circulation pipe 502, and allows the fluid to be output from the circulation pipe 404 to the outside of the circulation pipe 502.

In the second embodiment, the one-way valve 503 is disposed in the circulation port, so that the fluid in the circulation pipe 404 forms a one-way flow, the fluid section difference between the circulation port and the circulation pipe 404 is further increased, the heat dissipation effect is improved, and the overall weight and cost are also reduced. Of course, in other possible embodiments, both end surfaces of the mover support 4 may be provided with the section changing member 5 for rapid heat dissipation.

In the first and second embodiments, when the mover assembly 2 moves by providing the section-changing member 5 having a fluid section difference with the flow pipe 404, a pressure difference is generated between the inside and the outside of the section-changing member 5, so as to push the fluid inside the mover assembly 2 to rapidly flow, thereby rapidly dissipating heat.

As shown in fig. 3, a third embodiment of the present invention specifically includes a stator assembly 1 and a mover assembly 2, two ends of the stator assembly 1 are respectively provided with a hollow supporting positioning member 3, the mover assembly 2 linearly reciprocates in the stator assembly 1 and the supporting positioning member 3, one end of the mover assembly 2 is provided with a cross-section changing member 5, an outer diameter of the cross-section changing member 5 is larger than the mover assembly 2 and smaller than an inner cross-sectional dimension (width) of the supporting positioning member 3, a first cavity 100 and a second cavity 200 are formed between two ends of the mover assembly 2 and the supporting positioning member 3, an end of the supporting positioning member 3 is provided with a vent hole 8 communicated with the first cavity 100, the second cavity 200, a gap 300 between the stator assembly 1 and the mover assembly 2 are communicated with the first cavity 100, and a pressure difference is formed between the inside and the outside of the supporting and positioning member 3 along with the movement of the section changing member 5, so that the fluid flow is maintained between the inside and the outside of the supporting and positioning member 3.

Of course, the section changing part 5 can also be directly matched with the casing of the linear power machine, the outer diameter of the section changing part 5 is larger than the mover component 2 and smaller than the internal section size (width) of the casing of the linear power machine, a first cavity 100 and a second cavity 200 are formed between the two ends of the mover component 2 and the supporting and positioning part 3 or between the casings of the linear power machine, the second cavity 200, the gap 300 between the stator component 1 and the casing of the linear power machine are communicated with the first cavity 100, and a pressure difference is formed between the two ends of the mover component and the outside of the supporting and positioning part 3 along with the movement of the section changing part 5, so that the inside and the outside of the supporting and positioning part 3 keep fluid flowing.

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, and active heat dissipation is mainly performed through the inside of the mover assembly 2, but in the third embodiment, the mover assembly 2 may be not only a hollow structure but also a solid structure, the mover assembly 2 is directly connected to the cross-section changing member 5, and the gap between the mover assembly 2 and the stator assembly 1 is kept in fluid flow through the movement of the mover assembly and the stator assembly, so as to achieve the purpose of rapid heat dissipation. The third embodiment expands the application range on the basis of the first and second embodiments, and is particularly applicable to a linear motor having the mover assembly 3 with a solid structure. Further, in the third embodiment, if the mover assembly 2 is a hollow structure, the heat dissipation manner of the inside of the mover assembly 2 of the first and/or second embodiments may be combined, so that the inside of the mover assembly 2 and the gap between the mover assembly 2 and the stator assembly 1 dissipate heat simultaneously with the movement of the mover assembly 2, thereby improving the heat dissipation effect to the maximum extent.

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

The supporting and positioning member 3 is provided with a flow hole 10 communicating with the outside, and the flow hole 10 communicates with the gap 300. The flow holes 10 are disposed such that when the mover assembly 2 moves, the flow holes 10 allow the fluid in the gap 300 and the first cavity 100 to be rapidly exchanged with the external fluid, thereby accelerating the flow rate among the second cavity 200, the gap 300, the first cavity 100, and the external fluid, and further improving the heat dissipation efficiency.

In order to ensure the connection stability between the mover assembly 2 and the section changing member 5, in the preferred embodiment, the section changing member 5 is integrally connected to and penetrates through the shaft core of the mover assembly 2, and in other possible embodiments, the section changing member 5 may be only disposed at the end of the mover assembly 2.

In addition, in order to improve the sliding smoothness between the mover assembly 2 and the mover support 4, the outer side wall of the sliding portion 11 is provided with a lubricant 7. The lubricating powder 7 is preferably graphite lubricating powder.

In order to prolong the service life of the mover assembly 2, the front end and the rear end of the mover assembly 2 are provided with elastic shock-absorbing pads 9, and the shock-absorbing pads 9 are made of elastic materials, such as rubber. The shock absorption pad 9 can buffer the rotor assembly 2 to reduce the impact of the back and forth movement of the rotor assembly 2 on the inner end of the supporting and positioning sleeve 3, so that the abrasion is reduced, the service life of the whole body is prolonged, and the noise generated by the rotor assembly 2 is reduced.

The scheme further discloses a power tool, which comprises a shell and other power tools, such as an electric nail gun, a rivet gun, a glue gun, a jig saw, a reciprocating saw, an electric pick and other structures of equipment, such as a circuit board, a start-stop part, a power supply and other components, wherein the corresponding structure of the power tool is the known technology and is not described herein any more.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. But radiating linear power machine initiatively, including stator module (1) and active cell subassembly (2), the both ends of stator module (1) are provided with respectively with its coaxial support setting element (3), active cell subassembly (2) are straight reciprocating motion in stator module (1), the support setting element (3), its characterized in that: the rotor assembly (2) is provided with a hollow rotor supporting piece (4) capable of flowing fluid, one end of the hollow rotor supporting piece is provided with a cross section changing piece (5), the other end of the hollow rotor supporting piece is an opening communicated with the outside, the cross section changing piece (5) is provided with a flow opening communicated with the outside, the flow cross section of the flow opening is smaller than the flow cross section inside the rotor assembly (2), and the inside and the outside of the cross section changing piece (5) form pressure difference along with the movement of the rotor assembly (2) so that the fluid flow is kept in the flow opening.

2. The linear power machine capable of actively dissipating heat according to claim 1, wherein: the rotor support (4) and the rotor assembly (2) move synchronously, a hollow shaft core of the rotor support (4) forms a circulation pipeline (404), the section changing piece (5) is arranged at a first end (401) of the rotor support (4) and communicated with the circulation pipeline (404), and the opening is arranged at a second end (402) of the rotor support (4).

3. The linear power machine capable of actively dissipating heat according to claim 2, wherein: the circulation port is a through hole (501) arranged at the axis of the section changing piece (5), and the aperture of the through hole (501) is smaller than the circulation section of the circulation pipeline (404).

4. The linear power machine capable of actively dissipating heat according to claim 2, wherein: the circulation port is composed of a circulation pipe (502) and a one-way valve (503), the circulation pipe (502) is arranged at the axis of the section changing piece (5), the pipe diameter of the circulation pipe (502) is smaller than that of the circulation pipeline (404), and the one-way valve (503) is arranged inside the circulation pipe (502) and enables fluid to be output from the circulation pipeline (404) to the outside of the circulation pipe (502).

5. The active heat dissipation linear power machine of claim 3 or 4, wherein: wear-resistant parts (6) are respectively arranged between the end parts of the section changing part (5) and the rotor assembly (2) and between the second end (402) and the end part of the rotor assembly (2), the wear-resistant parts (6) are sleeved on the rotor support part (4) and move synchronously with the rotor assembly (2) through the section changing part (5) and the second end (402).

6. The linear power machine capable of actively dissipating heat according to claim 5, wherein: the wear-resistant part (6) is close to the part of the rotor assembly (2) and is in sliding contact with the inner wall of the supporting and positioning part (3).

7. But radiating linear power machine initiatively, including stator module (1) and active cell subassembly (2), the both ends of stator module (1) are provided with inside hollow support setting element (3) respectively, active cell subassembly (2) are in be straight reciprocating motion in stator module (1), the support setting element (3), its characterized in that: one end of the rotor component (2) is provided with a section changing part (5), the outer diameter of the section changing part (5) is larger than the rotor component (2) and smaller than the supporting positioning part (3) or the inner section size of the linear power machine shell, a first cavity (100) and a second cavity (200) are formed between the two ends of the rotor component (2) and the supporting positioning part (3) or the linear power machine shell, the end part of the supporting positioning part (3) is provided with a vent hole (8) communicated with the first cavity (100), a gap (300) between the stator component (1) and the rotor component (2) or a gap (300) between the stator component (1) and the linear power machine shell is communicated with the first cavity (100) and forms a pressure difference with the outer part of the supporting positioning part (3) along with the movement of the section changing part (5), so that the fluid flow is maintained inside and outside the support and positioning member (3).

8. The linear power machine capable of actively dissipating heat according to claim 7, wherein: the supporting and positioning part (3) or the casing of the linear power machine is provided with a circulation hole (10) communicated with the outside, and the circulation hole (10) is communicated with the gap (300).

9. The linear power machine capable of actively dissipating heat according to claim 7, wherein: a sliding part (11) is arranged between the two supporting and positioning parts (3), and the rotor assembly (2) is slidably sleeved on the sliding part (11) and slides relative to the stator assembly (1).

10. A power tool, characterized in that: an active heat dissipation linear motor as claimed in any one of claims 1-9.