Motor with concealed installation of external centrifugal switch and method

Abstract

The motor comprises a motor body, a motor fan cover is installed at the rear end of the motor body, a containing cavity is formed in a rear end cover of the motor body from outside to inside, and a rotor rear shaft of the motor body penetrates through the rear end cover and extends out of the containing cavity; a centrifugal mechanism of the centrifugal switch is installed on the rotor rear shaft in the containing cavity, a fixed switch of the centrifugal switch is installed at the bottom of the containing cavity, the rotor rear shaft is sleeved with fan blades, the fan blades cover the containing cavity, and the fan blades and the rear end cover are located in the motor fan cover. The invention also provides a hidden installation method for the centrifugal switch and a dust accumulation prevention method for the centrifugal switch. The overall size of the motor is smaller, the protection level of the motor is improved, and the service life of the motor is prolonged. Meanwhile, the air collection and supply effects are improved, and the cooling effect of the fan blades on the outer wall of the motor is fully exerted.

Description

Technical Field

[0001] The present invention relates to a motor, and particularly to a motor with a concealed externally mounted centrifugal switch and a method thereof. Background Art

[0002] An internal centrifugal switch can start the motor according to the running speed of the motor. When the rotational speed of the motor reaches a certain value, the centrifugal force will cause the switch to automatically disconnect, thereby starting the motor. However, the internal centrifugal switch has its inherent disadvantages. For example, due to its internal installation, it is extremely inconvenient during installation and debugging, and the motor needs to be disassembled; when the motor is overloaded, the winding high-temperature insulating material will generate combustible gas. When the motor starts and stops the centrifugal switch, the switch contacts generate sparks to ignite the combustible gas, resulting in the burning of the motor; the internal centrifugal switch is usually applicable to single-phase motors with relatively small power. For motors with larger power and complex operating conditions, other types of protection devices are required to provide higher reliability and precise protection.

[0003] Therefore, an externally mounted centrifugal switch has emerged. The externally mounted centrifugal switch sets the start and stop thresholds of the centrifugal switch according to different running speed requirements, so it is more convenient for installation and maintenance, and at the same time, the risk of burning is avoided; however, the installation form of the motor with an externally mounted centrifugal switch is to set a motor wind cover outside the end cover on one side of the motor body, and a centrifugal switch and a fan are arranged inside the motor wind cover, which requires additional space, lengthens the size of the protective cover and the overall size of the motor. This space needs to frequently clean the dust at the contact part of the centrifugal switch, and due to the limited installation space, the air collection and air supply structure of the motor is damaged, which is also likely to cause the temperature of the motor to rise. Summary of the Invention

[0004] In order to solve the deficiencies of the above technologies, the present invention provides a motor with a concealed externally mounted centrifugal switch and a method thereof.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A motor with a concealed externally mounted centrifugal switch, including a motor body, a motor wind cover is installed at the rear end of the motor body. An accommodation chamber is opened from the outside to the inside on the rear end cover of the motor body, and the rear shaft of the rotor of the motor body penetrates through the rear end cover and extends out from the accommodation chamber;

[0006] The centrifugal mechanism of the centrifugal switch is installed on the rear shaft of the rotor in the accommodation chamber, the fixed switch of the centrifugal switch is installed at the bottom of the accommodation chamber, a wind blade is sleeved on the rear shaft of the rotor, the wind blade covers the accommodation chamber, and the wind blade and the rear end cover are located inside the motor wind cover.

[0007] Furthermore, a cover plate is placed on the upper part of the rear end cover. The cover plate is located above the accommodation chamber at the same time, and the two jointly reserve a circular opening for the rotation of the centrifugal mechanism.

[0008] Furthermore, a cover plate fixing hole is extended into the accommodation chamber on the rear end cover. The cover plate is connected to the rear end cover by screwing with the cover plate fixing hole through a bolt.

[0009] Furthermore, a dust-proof table that bulges outward is provided along the periphery of the circular opening jointly on the cover plate and the rear end cover. A dust-proof groove matching the dust-proof table is provided on the inner side of the wind blade. When the wind blade rotates, a dynamic seal is formed between the dust-proof groove and the dust-proof table.

[0010] Furthermore, a support table is provided on the side wall in the accommodation chamber, and the lower end surface of the cover plate abuts against the support table.

[0011] Furthermore, the wind blade has a bowl-shaped half shell, and the half shell covers the centrifugal mechanism. A streamline transition is formed between the shape of the half shell and the rear end cover.

[0012] Furthermore, two wire outlet holes are provided at the bottom of the accommodation chamber. The positions of the wire outlet holes correspond to the wiring points of the fixed switch of the centrifugal switch, and the wire outlet holes are arranged close to the edge of the rear end cover.

[0013] Furthermore, a bearing chamber is connected to the back side of the accommodation chamber, and the bearing chamber is centered on the rear shaft of the rotor.

[0014] Furthermore, at least two reinforcing ribs are connected between the outer wall of the accommodation chamber and the inner wall of the rear end cover.

[0015] A method for concealing and installing an external centrifugal switch of a motor includes a method for concealing and installing the centrifugal switch and a method for preventing dust accumulation on the centrifugal switch;

[0016] The method for concealing and installing the centrifugal switch is to preset an embedded accommodation chamber on the rear end cover, penetrate the rear shaft of the rotor through the accommodation chamber and extend it out, use the accommodation chamber as the installation space of the centrifugal switch, install the centrifugal mechanism on the rear shaft of the rotor in the accommodation chamber, drive the centrifugal mechanism to rotate by the rear shaft of the rotor, realize the opening and closing of the fixed switch, install the fixed switch at the bottom of the accommodation chamber, cooperate with the centrifugal mechanism, and after the motor is started, cut off the starting capacitor to complete the starting process. The wind blade forms a cover above the centrifugal mechanism to conceal and install the centrifugal switch;

[0017] The method for preventing dust accumulation on the centrifugal switch is to set a dust-proof table outside the circular opening jointly reserved by the cover plate and the accommodation chamber, set a dust-proof groove on the wind blade, and form a dynamic seal when the wind blade rotates to prevent dust from entering the centrifugal switch to form dust accumulation.

[0018] The present invention discloses a motor with a concealed externally mounted centrifugal switch and a method thereof. By installing a centrifugal switch and related components at the rear end of the motor body, compact installation is achieved using limited space, making the overall size of the motor smaller. By providing a dust-proof platform around the circular opening of the rear end cover and the accommodating chamber, and forming a dust-proof groove on the fan blade, a dynamic seal is formed, effectively preventing dust and impurities from entering the accommodating chamber where the centrifugal switch is located, improving the protection level of the motor and extending its service life. At the same time, the above design reserves sufficient air-collecting space for the fan blade within the motor wind cover, enhancing the air-collecting and air-sending effects, and giving full play to the cooling effect of the fan blade on the outer wall of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic diagram of the structural disassembly of the present invention.

[0020] Figure 2 is a three-dimensional structural schematic diagram of the rear end cover of the present invention Figure 1 。

[0021] Figure 3 is a three-dimensional structural schematic diagram of the rear end cover of the present invention Figure 2 。

[0022] Figure 4 is a schematic diagram of the structure where the cover plate is placed on the rear end cover.

[0023] Figure 5 is a schematic diagram of the structure of the fan blade.

[0024] In the figure: 1, motor body; 2, motor wind cover; 3, rear end cover; 4, accommodating chamber; 5, centrifugal switch; 6, fan blade; 7, cover plate; 8, cover plate fixing hole; 9, dust-proof platform; 10, dust-proof groove; 11, support platform; 12, wire outlet hole; 13, bearing chamber; 14, reinforcing rib; 15, rear shaft of the rotor; 51, centrifugal mechanism; 52, fixed switch; 61, half shell. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0026] Such as Figures 1-4The shown motor with a concealed externally-mounted centrifugal switch can simultaneously solve the problems of reducing the overall size of the motor and preventing dust accumulation on the centrifugal switch. It includes a motor body 1, and a motor wind cover 2 is installed at the rear end of the motor body 1. An accommodation chamber 4 is opened from the outside to the inside on the rear end cover 3 of the motor body 1. The accommodation chamber 4 is opened from the middle of the rear end cover 3 and radially along the rear end cover 3 towards the side edge close to the rear end cover 3, forming a closed accommodation space in the radial direction of the rear end cover 3, that is, the accommodation chamber 4. The fixed switch 52 of the centrifugal switch 5 is installed at the bottom of the accommodation chamber 4. The fixed switch can be fixed to the bottom of the accommodation chamber 4 by screws, but is not limited to the above method. Two wire outlet holes 12 are provided at the bottom of the accommodation chamber 4. The positions of the wire outlet holes 12 correspond to the wiring points of the fixed switch of the centrifugal switch 5. The wire outlet holes 12 are arranged close to the edge of the rear end cover 3. The wires on the centrifugal switch 5 are connected to the starting coil inside the motor through the wire outlet holes 12.

[0027] The rear shaft 15 of the rotor of the motor body 1 penetrates through the rear end cover 3 and extends out from the accommodation chamber 4; the centrifugal mechanism 51 of the centrifugal switch 5 is installed on the rear shaft 15 of the rotor inside the accommodation chamber 4. In this embodiment, the accommodation chamber 4 accommodates most of the volume of the centrifugal mechanism 51. A wind blade 6 is sleeved on the rear shaft 15 of the rotor. The wind blade 6 covers the accommodation chamber 4. The wind blade 6 and the rear end cover 3 are located inside the motor wind cover 2. As Figure 5 The shown wind blade 6 has a bowl-shaped half shell 61. The half shell 61 covers the centrifugal mechanism 51. The outer shapes of the half shell 61 and the rear end cover 3 form a streamlined transition. It should be understood that if the accommodation chamber 4 needs to accommodate the entire centrifugal mechanism, the height of the accommodation chamber 4 needs to be increased, and correspondingly, the thickness of the rear end cover 3 also needs to be increased. By the above scheme, the centrifugal switch and related components are installed at the rear end of the motor body and hidden between the motor wind cover and the rear end cover, which can utilize the limited space at the rear end of the motor to compactly install components such as the centrifugal mechanism and the fixed switch, thereby effectively reducing the overall size of the motor, making it more compact and lightweight, and being applicable to application scenarios with limited space or high requirements for size and appearance. By installing the centrifugal switch and the centrifugal mechanism in the internal accommodation chamber, this setting method can effectively protect the centrifugal switch from the influence of external dust, moisture, etc., improve the protection level of the motor, extend its service life, and also reduce the chance of external contact with the centrifugal switch, improving the safety of use.

[0028] A cover plate 7 is placed on the rear end cover 3. The cover plate 7 is also located above the accommodation chamber 4. The two together reserve a circular opening for the rotation of the centrifugal mechanism. On the rear end cover 3, there is a cover plate fixing hole 8 extending into the accommodation chamber 4. The cover plate 7 is connected to the rear end cover 3 by screwing with the cover plate fixing hole 8 through bolts. On the inner side wall of the accommodation chamber 4, there is a support table 11. The lower end surface of the cover plate 7 abuts against the support table 11. On the cover plate 7 and the rear end cover 3 together, there is a dust-proof table 9 that bulges outward along the periphery of the circular opening. Inside the wind blade 6, there is a dust-proof groove 10 matching the dust-proof table 9 as shown in Figure 5 . When the wind blade 6 rotates, the dust-proof groove 10 and the dust-proof table 9 form a dynamic seal. When the wind blade rotates, it not only generates wind power, but also through the dynamic sealing effect formed by setting the dust-proof table and the dust-proof groove, it can prevent dust from entering the accommodation chamber 4 where the centrifugal switch is located through the dust-proof groove.

[0029] On the back side of the accommodation chamber 4, there is a bearing chamber 13. The bearing chamber 13 takes the rear rotor shaft 15 as the axis. The bearing chamber 13 is pre-positioned in front of the accommodation chamber 4. In the motor wind cover, enough air-collecting space is reserved for the wind blade, greatly improving the air-collecting effect, driving the improvement of the air supply effect, and giving full play to the cooling effect of the wind blade on the outer wall of the motor.

[0030] In addition, in order to increase the structural strength, in this embodiment, two reinforcing ribs 14 are connected between the outer wall of the accommodation chamber 4 and the inner wall of the rear end cover 3.

[0031] The present invention includes a method for concealing the installation of the centrifugal switch and a method for preventing dust accumulation on the centrifugal switch. The method for concealing the installation of the centrifugal switch is to preset an embedded accommodation chamber on the rear end cover, so that the rear rotor shaft penetrates through the accommodation chamber and extends out. The accommodation chamber is used as the installation space for the centrifugal switch. The centrifugal mechanism is installed on the rear rotor shaft in the accommodation chamber, and the centrifugal mechanism is driven by the rear rotor shaft to rotate to realize the opening and closing of the fixed switch. The fixed switch is installed at the bottom of the accommodation chamber and cooperates with the centrifugal mechanism to cut off the starting capacitor after the motor is started, completing the starting process. The wind blade forms a cover above the centrifugal mechanism to conceal the installation of the centrifugal switch;

[0032] The method for preventing dust accumulation on the centrifugal switch is to set a dust-proof table outside the circular opening jointly reserved by the cover plate and the accommodation chamber, and set a dust-proof groove on the wind blade. When the wind blade rotates, a dynamic seal is formed to prevent dust from entering the centrifugal switch and forming dust accumulation.

[0033] In summary, by installing a centrifugal switch and related components at the rear end of the motor body, the present invention realizes a compact installation using limited space, making the overall size of the motor smaller. By providing a dust-proof platform around the rear end cover and the circular opening of the accommodating chamber, and forming a dust-proof groove on the fan blade, a dynamic seal is formed, effectively preventing dust and impurities from entering the accommodating chamber where the centrifugal switch is located, improving the protection level of the motor and extending its service life. At the same time, the above design reserves sufficient air-collecting space for the fan blade within the motor wind cover, enhancing the air-collecting and air-sending effects, and fully exerting the cooling effect of the fan blade on the outer wall of the motor.

[0034] The above embodiments are not limitations on the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions, or substitutions made by those skilled in the art within the scope of the technical solution of the present invention also fall within the protection scope of the present invention.

Claims

1. A motor with a concealed externally mounted centrifugal switch, comprising a motor body (1), and a motor wind cover (2) is installed at the rear end of the motor body (1), characterized in that: An accommodation chamber (4) is formed from the outside to the inside on the rear end cover (3) of the motor body (1). The rear rotor shaft (15) of the motor body (1) penetrates through the rear end cover (3) and extends out from the accommodation chamber (4). The centrifugal mechanism (51) of the centrifugal switch (5) is installed on the rear rotor shaft (15) inside the accommodation chamber (4). The fixed switch (52) of the centrifugal switch (5) is installed at the bottom of the accommodation chamber (4). A wind leaf (6) is sleeved on the rear rotor shaft (15). The wind leaf (6) covers the accommodation chamber (4). The wind leaf (6) and the rear end cover (3) are located inside the motor wind cover (2).

2. The motor with a concealed externally mounted centrifugal switch according to claim 1, wherein: A cover plate (7) is placed on the rear end cover (3). The cover plate (7) is also located above the accommodation chamber (4). Together, they reserve a circular opening for the rotation of the centrifugal mechanism (51).

3. The motor with a concealed externally mounted centrifugal switch according to claim 2, wherein: Cover plate fixing holes (8) are extended into the accommodation chamber (4) on the rear end cover (3). The cover plate (7) is connected to the rear end cover (3) by screwing bolts into the cover plate fixing holes (8).

4. The motor with a concealed externally mounted centrifugal switch according to claim 2, characterized in that: A dust-proof platform (9) that bulges outwards is provided along the periphery of the circular opening on both the cover plate (7) and the rear end cover (3). A dust-proof groove (10) matching the dust-proof platform (9) is provided on the inner side of the wind leaf (6). When the wind leaf (6) rotates, a dynamic seal is formed between the dust-proof groove (10) and the dust-proof platform (9).

5. The motor with a concealed externally mounted centrifugal switch according to claim 3, characterized in that: A support platform (11) is provided on the side wall inside the accommodation chamber (4). The lower end surface of the cover plate (7) abuts against the support platform (11).

6. The motor with a concealed externally mounted centrifugal switch according to claim 4, wherein: The wind leaf (6) has a bowl-shaped half shell (61). The half shell (61) covers the centrifugal mechanism (51). A streamline transition is formed between the half shell (61) and the outer shape of the rear end cover (3).

7. The motor with a concealed externally mounted centrifugal switch according to claim 4, characterized in that: Two wire outlet holes (12) are provided at the bottom of the accommodation chamber (4). The positions of the wire outlet holes (12) correspond to the wiring points of the fixed switch of the centrifugal switch (5). The wire outlet holes (12) are provided close to the edge of the rear end cover (3).

8. The motor with a concealed externally mounted centrifugal switch according to any one of claims 1-7, characterized in that: A bearing chamber (13) is connected to the back side of the accommodation chamber (4). The bearing chamber (13) is centered on the rear rotor shaft (15).

9. The motor with a concealed externally mounted centrifugal switch according to any one of claims 1-7, characterized in that: At least two reinforcing ribs (14) are connected between the outer wall of the accommodation chamber (4) and the inner wall of the rear end cover (3).

10. The method for a motor with a concealed externally mounted centrifugal switch according to any one of claims 1-7, characterized in that: The method includes a concealed installation method for the centrifugal switch and a dust-proof method for the centrifugal switch. The concealed installation method for the centrifugal switch is to preset an embedded accommodation chamber on the rear end cover, enable the rear rotor shaft to penetrate through the accommodation chamber and extend out, use the accommodation chamber as the installation space for the centrifugal switch, install the centrifugal mechanism on the rear rotor shaft inside the accommodation chamber, drive the centrifugal mechanism to rotate by the rear rotor shaft to realize the opening and closing of the fixed switch, install the fixed switch at the bottom of the accommodation chamber, cooperate with the centrifugal mechanism, cut off the starting capacitor after the motor completes starting, complete the starting process, and form a cover above the centrifugal mechanism with the wind leaf to conceal the installation of the centrifugal switch. The dust-proof method for the centrifugal switch is to provide a dust-proof platform outside the circular opening jointly reserved by the cover plate and the accommodation chamber, provide a dust-proof groove on the wind leaf, and form a dynamic seal when the wind leaf rotates to prevent dust from entering the centrifugal switch and forming dust accumulation.

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