Brushless direct current motor
By designing a connection and limiting mechanism, the sealing block can be dynamically adjusted, which solves the heat dissipation problem of brushless DC motors under high power and high temperature, and improves the motor's heat dissipation efficiency and dustproof capability.
Patent Information
- Application Number
- CN202422951782.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Brushless DC motors suffer from severe heat dissipation problems when operating at high power or in high-temperature environments, leading to decreased motor performance and reduced reliability. Common heat dissipation holes are prone to dust accumulation, affecting heat dissipation efficiency.
A brushless DC motor was designed. Through the cooperation of the connecting mechanism and the limiting mechanism, the movement of the sealing block and the sealing effect can be realized as the speed changes, ensuring efficient heat dissipation and preventing dust from entering at low speeds.
It improves the heat dissipation efficiency of the motor, avoids heat accumulation under high power operation, and ensures the heat dissipation effect and dust prevention performance of the motor at different speeds.
Smart Images
Figure CN223666147U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor technical field, concretely is brushless direct current motor. BACKGROUND
[0002] Brushless direct current motor (Brushless Direct Current Motor, BLDCM or BLDC for short) is a kind of motor using electronic commutating device to replace the brush and commutator in traditional direct current motor, it has the advantages of high efficiency, small size, light weight, simple maintenance, high reliability, widely used in various fields, such as power tools, household appliances, industrial automation, aerospace, etc.
[0003] However, in the practical application of brushless direct current motor, the heat dissipation problem is one of the key factors affecting its performance and reliability, especially in high-power operation or high ambient temperature, if the heat generated inside the motor cannot be dissipated in time, the temperature of the motor will rise, and then the efficiency and service life of the motor will be affected, and even the motor may be damaged, the common motor cooling hole opening is small, dust is easy to accumulate after long-term use, reduces the heat dissipation effect, therefore, a brushless direct current motor is needed to solve the existing problems. UTILITY MODEL CONTENTS
[0004] The utility model aims at providing brushless direct current motor to solve the above technical problem.
[0005] Therefore, the utility model provides a brushless direct current motor, which comprises a shell, a rotor movably connected to the inner side of the shell, a rotating shaft fixedly connected to the shaft center of the rotor, a stator fixedly connected to the inside of the shell, and the stator is located on the inner side of the rotor, a heat dissipation shell fixedly connected to the tail end of the shell, a plurality of heat dissipation openings are formed through the heat dissipation shell, and a sealing block is movably connected to the inner side of each heat dissipation opening, a plurality of connecting mechanisms are arranged on the inner side of the heat dissipation shell, and the inner side of each connecting mechanism is fixedly connected with the sealing block, the rotating shaft extends to the shaft center of the heat dissipation shell, a limiting mechanism is movably connected to the outer side of the rotating shaft, and a sleeve is arranged between the limiting mechanisms, the sleeve is movably sleeved on the outer side of the rotating shaft, a plurality of driving mechanisms are fixedly connected to the outer side of the sleeve, and one end of each driving mechanism is movably connected with one end of the connecting mechanism.
[0006] The connecting mechanism comprises a connecting rod, a moving piece, a reset spring and a support frame, the connecting rod penetrates the middle position of the support frame, and the connecting rod is movably connected with the support frame, the reset spring is sleeved on the outer side of the connecting rod, and one end of the connecting rod is fixedly connected to the back side of the moving piece.
[0007] The end of the connecting rod away from the moving piece is fixedly connected to the inner side of the sealing block.
[0008] The support frame is fixedly connected to the inner side of the heat dissipation opening, one end of the reset spring is fixedly connected to the back side of the moving piece, and the other end of the reset spring is fixedly connected to the surface of the support frame.
[0009] The limiting mechanism comprises a clamping ring, a gasket and limiting columns, the outer side of the rotating shaft is provided with a ring groove, the clamping ring is symmetrically arranged, the inner side of the clamping ring is clamped in the ring groove, the opposite sides of the clamping ring are clamped with each other, a plurality of limiting columns are fixedly connected to the surface of the clamping ring, a plurality of limiting holes are formed in the two ends of the sleeve, and the limiting holes are matched with the limiting columns respectively, and the gasket is sleeved on the outer side of the rotating shaft and abuts against one side of the sleeve.
[0010] The clamping ring and the gasket are respectively arranged at the two ends of the sleeve.
[0011] The outer side of the rotating shaft is provided with a group of symmetric threads, and the outer side of the rotating shaft is movably connected with a group of symmetric clamping rings through the threads.
[0012] The clamping rings abut against the clamping ring and the gasket respectively.
[0013] The driving mechanism comprises a guide cylinder, a moving rod and a sliding ball, the guide cylinder is fixedly connected to the outer side of the sleeve, the sliding ball is fixedly connected to one end of the moving rod, and the other end of the moving rod is movably connected to the inside of the moving rod.
[0014] The moving piece is in an arc shape, and the sliding ball is movably connected to the front side of the moving piece.
[0015] Compared with the prior art, the beneficial technical effects of the technical scheme of the utility model are as follows:
[0016] Firstly, the connecting mechanism is arranged, the moving piece and the sealing block can be synchronously moved through the connecting rod, the moving piece is controlled to move outward, the sealing block can move out of the heat dissipation opening, the heat in the motor can be directly discharged from the heat dissipation opening, the heat dissipation efficiency is improved, and the reset spring is helpful to the resetting of the sealing block, and the dust from the outside can be prevented from entering when the motor is in a low speed or non-starting state.
[0017] Secondly, the limiting mechanism is arranged, when the rotating shaft rotates, the sleeve rotates synchronously, the guide cylinder rotates synchronously around the axis of the sleeve, when the rotating speed of the rotating shaft increases, centrifugal force is generated, the moving rod and the sliding ball move away from the sleeve along the guide cylinder, the sliding ball continuously moves close to the front side of the moving piece, until the sliding ball rotates and abuts against the front side of the moving piece, so that the moving piece is pushed to move away from the axis of the sleeve, and the sealing block can be moved away from the heat dissipation opening according to the increase of the rotating speed of the rotating shaft, so that the heat accumulation of the motor under high power operation is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0019] Figure 1 It is a schematic diagram of the back side structure of the utility model;
[0020] Figure 2 It is a schematic diagram of the back side structure of the utility model;
[0021] Figure 3 It is a schematic diagram of the inside structure of the heat dissipation shell of the utility model;
[0022] Figure 4 It is a schematic diagram of the limiting mechanism structure of the utility model;
[0023] Figure 5 It is a schematic diagram of the enlarged structure of A in the utility model Figure 3
[0024] In the figure: 1, the shell; 2, the rotor; 3, the rotating shaft; 4, the stator; 5, the heat dissipation shell; 6, the heat dissipation port; 7, the sealing block; 8, the connecting mechanism; 801, the connecting rod; 802, the moving piece; 803, the reset spring; 804, the support frame; 9, the limiting mechanism; 901, the snap ring; 902, the gasket; 903, the limiting column; 10, the sleeve; 11, the driving mechanism; 1101, the guide cylinder; 1102, the moving rod; 1103, the sliding ball; 12, the ring groove; 13, the limiting hole; 14, the clamping ring. DETAILED DESCRIPTION
[0025] The technical solutions of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the utility model.
[0026] The present application will be described in combination with the drawings and specific embodiments:
[0027] As Figures 1-5 As shown, the utility model provides a technical scheme: brushless DC motor, including shell 1, a plurality of heat dissipation fins are fixedly connected to the outside of shell 1, and present circular array distribution, is used for motor heat dissipation, the inside of shell 1 movably connects rotor 2, the axle of rotor 2 is fixedly connected with rotating shaft 3, the inside of shell 1 is fixedly connected with stator 4, and stator 4 is located the inside of rotor 2, the tail end of shell 1 is fixedly connected with heat dissipation shell 5, a plurality of heat dissipation openings 6 are throughly set up in heat dissipation shell 5, and the inside of heat dissipation opening 6 movably connects sealing block 7, and the shielding or unshielding of heat dissipation opening 6 is shielded or unshielded by sealing block 7, effectively plays the role of heat dissipation, improves heat dissipation efficiency, the inside of heat dissipation shell 5 is provided with a plurality of connecting mechanisms 8, and the inside of connecting mechanism 8 is fixedly connected with sealing block 7 respectively, rotating shaft 3 extends to the axle of heat dissipation shell 5, the outside of rotating shaft 3 movably connects limit mechanism 9, and sleeve 10 is arranged between limit mechanism 9, limit mechanism 9 is positioned to sleeve 10, is helpful to sleeve 10 rotation with rotating shaft 3, and it is convenient to disassemble and repair, sleeve 10 movably sets up in the outside of rotating shaft 3, the outside of sleeve 10 is fixedly connected with a plurality of drive mechanisms 11, and one end of drive mechanism 11 is movably connected with one end of connecting mechanism 8, in this embodiment, connecting mechanism 8 is provided with eight groups, and drive mechanism 11 is provided with four groups, since rotating shaft 3 drives drive mechanism 11 high-speed rotation, four drive mechanisms 11 can make eight connecting mechanisms 8 operate, improve the cooperation efficiency between mechanisms.
[0028] As Figure 1 , Figure 3 and Figure 5 shown, connecting mechanism 8 includes connecting rod 801, moving piece 802, reset spring 803 and support frame 804, connecting rod 801 penetrates the middle position of support frame 804, and connecting rod 801 is movably connected with support frame 804, reset spring 803 is sleeved on the outside of connecting rod 801, one end of connecting rod 801 is fixedly connected to the back of moving piece 802, the end of connecting rod 801 away from moving piece 802 is fixedly connected to the inside of sealing block 7, support frame 804 is fixedly connected to the inside of heat dissipation opening 6, one end of reset spring 803 is fixedly connected to the back of moving piece 802, and the other end of reset spring 803 is fixedly connected to the surface of support frame 804, by connecting rod 801, moving piece 802 and sealing block 7 can be moved synchronously, so as to control moving piece 802 to move outward, so that sealing block 7 moves out of heat dissipation opening 6, so that the heat inside the motor is directly discharged from heat dissipation opening 6, so as to improve the heat dissipation efficiency, and reset spring 803 is helpful to reset sealing block 7, when the motor is at low speed or not started, to prevent external dust from entering.
[0029] As Figure 1 and Figure 4As shown, the limiting mechanism 9 includes a snap ring 901, a gasket 902 and a limiting column 903, the outer side of the rotating shaft 3 is provided with a ring groove 12, the snap ring 901 is symmetrically arranged, and the inner side of the snap ring 901 is clamped in the inner part of the ring groove 12, the opposite sides of the snap ring 901 are clamped with each other, and the surface of the snap ring 901 is fixedly connected with a plurality of limiting columns 903, the both ends of the sleeve 10 are provided with a plurality of limiting holes 13, and the limiting holes 13 are respectively matched with the limiting columns 903, the gasket 902 is sleeved on the outer side of the rotating shaft 3, and the gasket 902 is attached to one side of the sleeve 10, the snap ring 901 and the gasket 902 are respectively located at the both ends of the sleeve 10, the outer side of the rotating shaft 3 is provided with a group of symmetrical threads, and the rotating shaft 3 is movably connected with a group of symmetrical clamping rings 14 through the threads, the clamping ring 14 is attached to the snap ring 901 and the gasket 902 respectively, and the sleeve 10 is effectively fixed through the cooperation of the limiting column 903 and the limiting hole 13, the snap ring 901 and the rotating shaft 3 are fixedly connected through the clamping groove, and the connection fastening degree of the sleeve 10 and the rotating shaft 3 is improved through the clamping ring 14.
[0030] As shown in Figure 1 , Figure 3 and Figure 5 , the driving mechanism 11 includes a guide cylinder 1101, a moving rod 1102 and a sliding ball 1103, the guide cylinder 1101 is fixedly connected to the outer side of the sleeve 10, the sliding ball 1103 is fixedly connected to one end of the moving rod 1102, and the other end of the moving rod 1102 is movably connected to the inner part of the moving rod 1102, the moving piece 802 is arc-shaped, and the sliding ball 1103 is movably connected to the front side of the moving piece 802, when the rotating shaft 3 rotates, the sleeve 10 rotates synchronously, the guide cylinder 1101 rotates synchronously around the axis of the sleeve 10, as the rotating speed of the rotating shaft 3 increases, centrifugal force is generated, the moving rod 1102 and the sliding ball 1103 move away from the sleeve 10 along the guide cylinder 1101, the sliding ball 1103 constantly moves close to the front side of the moving piece 802, until the sliding ball 1103 rotates and abuts against the front side of the moving piece 802, thereby pushing the moving piece 802 to move away from the axis of the sleeve 10, so as to realize that the sealing block 7 is away from the heat dissipation opening 6 according to the increase of the rotating speed of the rotating shaft 3, avoid heat accumulation of the motor under high-power operation, and the reset spring 803 resets the moving piece 802, which can push the moving rod 1102 to reset.
[0031] Working principle: in use, first, the clasp ring 901 near the shell 1 side is clamped on the outside of the ring groove 12, then the sleeve 10 is sleeved to the outside of the rotating shaft 3, and the limiting hole 13 of the sleeve 10 is aligned with the limiting column 903 respectively, so that the limiting column 903 is inserted into the inside of the limiting hole 13, then the gasket 902 is sleeved on the outside of the rotating shaft 3, and the gasket 902 is attached to the other end of the sleeve 10, by rotating the clamping ring 14, the clamping ring 14 is tightly attached to the gasket 902 and the clasp ring 901 respectively; when the rotating shaft 3 rotates, the sleeve 10 rotates synchronously, the guide cylinder 1101 rotates synchronously around the axis of the sleeve 10, as the rotating speed of the rotating shaft 3 increases, centrifugal force is generated, the moving rod 1102 and the sliding ball 1103 move away from the sleeve 10 along the guide cylinder 1101, the sliding ball 1103 constantly moves close to the front side of the moving piece 802, until the sliding ball 1103 rotates and touches the front side of the moving piece 802, thereby pushing the moving piece 802 to move away from the axis of the sleeve 10, the connecting rod 801 pushes the sealing block 7 to move away from the heat dissipation opening 6, so that the return spring 803 is compressed and shortened, as the rotating speed of the rotating shaft 3 increases, the opening interval of the heat dissipation opening 6 is larger, the heat dissipation of the motor is increased.
[0032] Finally, it should be pointed out that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.
Claims
1. A brushless DC motor comprising a housing (1), characterized in that: The inner side of the shell (1) is movably connected with a rotor (2), the axis of the rotor (2) is fixedly connected with a rotating shaft (3), the inside of the shell (1) is fixedly connected with a stator (4), and the stator (4) is located at the inner side of the rotor (2), the tail end of the shell (1) is fixedly connected with a heat dissipation shell (5), a plurality of heat dissipation openings (6) are throughly formed on the heat dissipation shell (5), and the inner sides of the heat dissipation openings (6) are movably connected with sealing blocks (7), a plurality of connecting mechanisms (8) are arranged on the inner side of the heat dissipation shell (5), and the connecting mechanisms (8) are fixedly connected with the inner sides of the sealing blocks (7) respectively, the rotating shaft (3) extends to the axis of the heat dissipation shell (5), the outer side of the rotating shaft (3) is movably connected with a limiting mechanism (9), and a sleeve (10) is arranged between the limiting mechanisms (9), the sleeve (10) is movably sleeved on the outer side of the rotating shaft (3), a plurality of driving mechanisms (11) are fixedly connected to the outer side of the sleeve (10), and one end of the driving mechanisms (11) is movably connected with one end of the connecting mechanisms (8).
2. The brushless DC motor of claim 1, wherein: The connecting mechanism (8) comprises a connecting rod (801), a moving piece (802), a reset spring (803) and a support frame (804), the connecting rod (801) penetrates the middle position of the support frame (804), and the connecting rod (801) is movably connected with the support frame (804), the reset spring (803) is sleeved on the outer side of the connecting rod (801), and one end of the connecting rod (801) is fixedly connected to the back side of the moving piece (802).
3. The brushless DC motor of claim 2, wherein: One end of the connecting rod (801) away from the moving piece (802) is fixedly connected to the inner side of the sealing block (7).
4. The brushless DC motor of claim 3, wherein: The support frame (804) is fixedly connected to the inner side of the heat dissipation opening (6), one end of the reset spring (803) is fixedly connected to the back side of the moving piece (802), and the other end of the reset spring (803) is fixedly connected to the surface of the support frame (804).
5. The brushless DC motor of claim 1, wherein: The limiting mechanism (9) comprises a clasp ring (901), a gasket (902) and a limiting column (903), the outer side of the rotating shaft (3) is provided with a ring groove (12), the clasp rings (901) are symmetrically arranged, the inner sides of the clasp rings (901) are clamped in the inner part of the ring groove (12), the opposite sides of the clasp rings (901) are clamped with each other, a plurality of limiting columns (903) are fixedly connected to the surface of the clasp ring (901), a plurality of limiting holes (13) are formed on both ends of the sleeve (10), and the limiting holes (13) are respectively matched with the limiting columns (903), the gasket (902) is sleeved on the outer side of the rotating shaft (3), and the gasket (902) is attached to one side of the sleeve (10).
6. The brushless DC motor of claim 5, wherein: The clasp ring (901) and the gasket (902) are respectively located at both ends of the sleeve (10).
7. The brushless DC motor of claim 6, wherein: A group of symmetric threads are formed on the outer side of the rotating shaft (3), and a group of symmetric clamping rings (14) are movably connected to the outer side of the rotating shaft (3) through the threads.
8. The brushless DC motor of claim 7, wherein: The clamping rings (14) are respectively attached to the clasp rings (901) and the gaskets (902).
9. The brushless DC motor of claim 2, wherein: The driving mechanism (11) comprises a guide cylinder (1101), a moving rod (1102) and a sliding ball (1103), the guide cylinder (1101) is fixedly connected to the outside of the sleeve (10), the sliding ball (1103) is fixedly connected to one end of the moving rod (1102), and the other end of the moving rod (1102) is movably connected to the inside of the moving rod (1102).
10. The brushless DC motor of claim 9, wherein: The moving piece (802) is in an arc shape, and the sliding ball (1103) is in sliding connection with the front side of the moving piece (802).