Centrifugal switch device of motor

Abstract

The utility model discloses a motor centrifugal switch device, which comprises a centrifuge and a centrifugal sheet, the centrifugal sheet comprises a centrifugal sheet base and a centrifugal spring sheet, the centrifugal spring sheet is riveted or connected above the centrifugal sheet base through a screw, and an on-off contact assembly is arranged between the centrifugal sheet base and the centrifugal spring sheet. The centrifuge comprises a connecting plate and a centrifugal disc arranged at the bottom of the connecting plate, a motor shaft connecting assembly is arranged in the middle of the top of the connecting plate, and centrifugal blocks are clamped to the inner sides of the two sides of the connecting plate. According to the utility model, the on-off contact piece is detachably connected to one end of the centrifugal spring piece, so that when the on-off contact piece and the lower contact piece are sintered together, the on-off contact piece and the lower contact piece can be replaced under the condition that the centrifugal piece is not detached, the replacement process is simple, the practical convenience is improved, the cost is reduced, and the service life is prolonged. And through the arrangement of the contact pad and the balls, the friction force between the centrifugal disc and the contact pad is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal switches, in particular to a motor centrifugal switch device. Background Art

[0002] The motor centrifugal switch is a device used to control the start and stop of the motor. Its function is to automatically disconnect the power supply when the motor reaches a certain speed to protect the safe operation of the motor and other equipment. The structure of the motor centrifugal switch usually includes centrifugal mechanism, contacts, springs and other components. The centrifugal mechanism consists of a centrifugal wheel and a centrifugal rod, which are installed at one end of the motor rotor. The contacts are composed of a fixed contact and a moving contact. The fixed contact is fixed to the motor housing, and the moving contact is connected to the centrifugal mechanism. The spring is used to maintain the contact between the moving contact and the fixed contact. The working principle of the motor centrifugal switch is based on the action of centrifugal force. When the motor is started, the rotor begins to rotate, and the centrifugal mechanism rotates accordingly. As the speed increases, the centrifugal force also increases. When the centrifugal force reaches the set value, the centrifugal mechanism will move outward, separating the moving contact from the fixed contact and disconnecting the power supply.

[0003] Single-phase motors require a centrifugal control switch when in use. It is installed on the motor rotor and is mainly used to control the starting coil of the single-phase motor. However, the existing centrifugal control switch still has the following problems in actual use:

[0004] 1. When using ordinary centrifugal control switches, the spring sheet and contact sheet of the centrifugal plate often burn out and stick together, making the centrifugal plate unusable. At this time, the entire centrifugal plate needs to be replaced. The commonly used replacement process is to stop the motor first, then remove the screws of the centrifugal plate, then turn the centrifugal switch, and then remove the entire centrifugal plate. This method of replacing the centrifugal plate is more complicated, and the entire centrifugal plate needs to be replaced every time, which increases the difficulty of the work and the cost;

[0005] 2. The existing centrifugal control switches on the market generally have the problem of unstable connection between the centrifugal switch and the motor shaft, which makes their use inconvenient. When the connection between the centrifugal switch and the motor shaft is unstable, the centrifugal switch may become loose when it rotates at high speed with the motor shaft, causing it to be unable to be used normally, and even causing certain dangers;

[0006] 3. In the existing centrifugal control switch, since the centrifugal disk rotates with the motor main shaft and the centrifugal spring sheet is fixed, there is a certain friction between the centrifugal disk and the centrifugal spring sheet when they contact each other. The switch contact sheet and the centrifugal spring sheet of the traditional centrifugal switch are generally integrated. Long-term use may cause the upper contact block on the switch contact sheet and the lower contact block on the lower contact sheet to be misaligned, affecting its power-on effect and even causing the centrifugal switch to fail to work normally.

[0007] Based on this, a motor centrifugal switch device is proposed, which provides a new solution to solve the above technical problems. Utility Model Content

[0008] Based on this, it is necessary to provide a motor centrifugal switch device to address the technical problems raised in the above background technology.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0010] The motor centrifugal switch device specifically includes a centrifuge and a centrifugal piece, the centrifugal piece includes a centrifugal piece base and a centrifugal spring piece, the centrifugal spring piece is riveted or connected to the top of the centrifugal piece base by screws, an on-off contact assembly is arranged between the centrifugal piece base and the centrifugal spring piece, the centrifuge includes a connecting plate and a centrifugal disk arranged at the bottom of the connecting plate, a motor shaft connecting assembly is arranged in the middle of the top of the connecting plate, centrifugal blocks are clamped on the inner sides of both sides of the connecting plate, centrifugal springs are arranged on the outer sides of both ends of the centrifugal block, connecting blocks are fixed at both ends of the top of the centrifugal disk, and the two ends of the centrifugal spring are respectively fixedly connected to the corresponding centrifugal block and the connecting block.

[0011] Preferably, the on-off contact assembly includes an on-off contact piece, an upper contact piece and a lower contact piece are respectively fixed on both sides of one end of the top of the centrifugal piece base, the on-off contact piece is arranged between the upper contact piece and the lower contact piece, an upper contact block is fixed to the bottom of the on-off contact piece, a lower contact block is fixed to the top of the lower contact piece and below the upper contact block, a movable groove is provided on the inner side of the centrifugal spring piece near one end of the on-off contact piece, a slider is slidably connected to the inner side of the movable groove, the on-off contact piece is fixed to the top of the slider by screws, and the on-off contact piece is slidably connected to the centrifugal spring piece via the slider.

[0012] Preferably, contact pads are fixed on both sides of the top of the centrifugal spring sheet, and a plurality of balls are rollingly connected to the inner side of the contact pads.

[0013] Preferably, the on-off contact assembly also includes a limiting spring piece, which is fixed to the top of the centrifugal plate base by screws and is located at one end of the on-off contact piece. Plug-in strips are fixed on both sides of the limiting spring piece close to one end of the on-off contact piece. The plug-in strip and the limiting spring piece are integrally formed, and an insulating sheet is plugged into the outer side of the plug-in strip. The insulating sheet is made of plastic or rubber, and one end of the on-off contact piece close to the insulating sheet is plugged into the inner side of the insulating sheet.

[0014] Preferably, the motor shaft connection assembly includes a connecting sleeve 1, which is fixedly connected to the middle of the top of the connecting plate, and expansion blocks are provided at both ends of the top of the connecting sleeve 1, and the inner side of the expansion block is threadedly connected with a positioning pin.

[0015] Preferably, the motor shaft connection assembly includes a second connecting sleeve, the second connecting sleeve is fixedly connected to the middle part of the top of the connecting plate, and positioning cavities are formed on the inner sides of the tops of both ends of the second connecting sleeve, and a positioning rod is slidably connected to the inner side of the positioning cavity, and a connecting rod is rotatably connected to the inner side of the positioning rod, and a positioning spring is sleeved on the outer side of the connecting rod, and the two ends of the positioning spring are respectively connected to the positioning rod and the second connecting sleeve located at the same end, and one end of the connecting rod away from the positioning rod passes through the second connecting sleeve and a knob is fixed thereon, and a threaded section is provided on the outer side of the connecting rod close to the knob, and the connecting rod is threadedly connected to the second connecting sleeve through the threaded section.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model connects the on-off contact piece to one end of the centrifugal spring piece in a detachable manner, so that when the on-off contact piece and the lower contact piece are sintered together, the on-off contact piece and the lower contact piece can be replaced without removing the centrifugal piece. The replacement process is relatively simple, which improves practical convenience and reduces costs.

[0018] 2. The utility model reduces the friction between the centrifugal disc and the contact pad by setting the contact pad and the ball, delays the time of misalignment of the on-off contact piece to a certain extent, thereby increasing the service life of the centrifugal piece.

[0019] 3. The utility model improves the stability of the connection between the centrifuge and the motor shaft through the structural design of the motor shaft connection assembly and the plug-in cooperation between the positioning rod and the motor shaft, thereby improving the positioning effect of the centrifuge and facilitating the installation and disassembly of the centrifuge. The operation is simple and convenient, which greatly improves the convenience of installation during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0023] Figure 3 This is a schematic diagram of the exploded structure of the centrifugal piece of the utility model;

[0024] Figure 4 It is a structural schematic diagram of the positioning rod, connecting rod and positioning spring of the utility model.

[0025] The markings in the figure are as follows:

[0026] 1. Centrifugal plate base; 2. Centrifugal spring plate; 3. Upper contact plate; 4. Lower contact plate; 5. Limiting spring; 6. Insulating plate; 7. On-off contact plate; 8. Positioning pin; 9. Centrifugal disc; 10. Centrifugal block; 11. Centrifugal spring; 12. Connecting sleeve 1; 13. Expansion block; 14. Connecting plate; 15. Connecting block; 16. Movable groove; 17. Connecting strip; 18. Contact pad; 19. Ball bearing; 20. Lower contact block; 21. Upper contact block; 22. Sliding block; 23. Connecting sleeve 2; 24. Positioning rod; 25. Connecting rod; 26. Positioning spring; 27. Knob; 28. Threaded section. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] Embodiment 1

[0029] Please refer to Figure 1-4A motor centrifugal switch device comprises a centrifuge and a centrifugal piece, the centrifugal piece comprises a centrifugal piece base 1 and a centrifugal spring piece 2, the centrifugal spring piece 2 is riveted or connected to the top of the centrifugal piece base 1 by screws, an on-off contact assembly is arranged between the centrifugal piece base 1 and the centrifugal spring piece 2, the centrifugal piece comprises a connecting plate 14 and a centrifugal disc 9 arranged at the bottom of the connecting plate 14, a motor shaft connecting assembly is arranged in the middle of the top of the connecting plate 14, centrifugal blocks 10 are clamped on the inner sides of both sides of the connecting plate 14, centrifugal springs 11 are arranged on the outer sides of both ends of the centrifugal block 10, connecting blocks 15 are fixed at both ends of the top of the centrifugal disc 9, and the two ends of the centrifugal spring 11 are respectively fixedly connected to the corresponding centrifugal block 10 and the connecting block 15; when in use, the on-off contact piece 7 can be The disassembly connection is connected to one end of the centrifugal spring sheet 2, so that when the on-off contact sheet 7 and the lower contact sheet 4 are sintered together, the on-off contact sheet 7 and the lower contact sheet 4 can be replaced without disassembling the centrifugal sheet. The replacement process is relatively simple, which improves practical convenience and reduces costs. By setting the contact pad 18 and the ball 19, the friction between the centrifugal disc 9 and the contact pad 18 is reduced, and the time for the on-off contact sheet 7 to be misaligned is delayed to a certain extent, thereby improving the service life of the centrifugal sheet. The positioning rod 24 is plugged into the motor shaft to improve the stability of the connection between the centrifuge and the motor shaft, thereby improving the positioning effect of the centrifuge, and at the same time, it is convenient to install and disassemble the centrifuge. The operation is simple and convenient, which greatly improves the convenience of installation during use.

[0030] Please refer to Figure 1-3 The on-off contact assembly includes an on-off contact piece 7. An upper contact piece 3 and a lower contact piece 4 are fixed to both sides of one end of the top of the centrifugal piece base 1. The on-off contact piece 7 is arranged between the upper contact piece 3 and the lower contact piece 4. An upper contact block 21 is fixed to the bottom of the on-off contact piece 7. A lower contact block 20 is fixed to the top of the lower contact piece 4 and below the upper contact block 21. A movable groove 16 is provided on the inner side of one end of the centrifugal spring piece 2 near the on-off contact piece 7. A slider 22 is slidably connected to the inner side of the movable groove 16. The on-off contact piece 7 is fixed to the slider 22 by screws. At the top, the on-off contact piece 7 is slidably connected to the centrifugal spring piece 2 through the slider 22. Specifically, the lower contact piece 4 is externally connected to a lead wire, and one side of the centrifugal spring piece 2 is also externally connected to a wire. When the on-off contact piece 7 is pressed down to make the upper contact block 21 contact the lower contact block 20, a loop is formed between the lower contact piece 4, the centrifugal spring piece 2, the motor and the external power supply through the wire, and the motor is energized. When the on-off contact piece 7 is separated from the lower contact piece 4 so that the lower contact block 20 is separated from the upper contact block 21, the motor is in a power-off state, thereby playing a role in switching the motor.

[0031] Embodiment 2

[0032] This embodiment further optimizes the first embodiment, please refer to Figure 1-3Contact pads 18 are fixed on both sides of the top of the centrifugal spring sheet 2, and a plurality of balls 19 are rollingly connected to the inner side of the contact pad 18. Specifically, the balls 19 are rollingly connected inside the contact pad 18, and the tops of the balls 19 slightly protrude from the upper surface of the contact pad 18. When the centrifugal disk 9 is pressed down, it first contacts the balls 19, so that while the centrifugal disk 9 is pressed down and rotated, the friction between it and the contact pad 18 is reduced, thereby increasing the service life of the centrifugal spring sheet 2.

[0033] Embodiment 3

[0034] This embodiment further optimizes the first and second embodiments. Figure 4 The on-off contact assembly also includes a limiting spring piece 5, which is fixed to the top of the centrifugal plate base 1 by screws and is located at one end of the on-off contact piece 7. The limiting spring piece 5 is fixed with plug-in strips 17 on both sides of one end of the on-off contact piece 7. The plug-in strip 17 is integrally formed with the limiting spring piece 5. An insulating sheet 6 is plugged into the outer side of the plug-in strip 17. The insulating sheet 6 is made of plastic or rubber. One end of the on-off contact piece 7 close to the insulating sheet 6 is plugged into the inner side of the insulating sheet 6. Specifically, when the insulating sheet 6 is injection molded, the plug-in strip 17 can be placed in the mold first and integrally formed with the insulating sheet 6, thereby improving the plug-in connection. The connection strength between the strip 17 and the insulating sheet 6, the plug-in strip 17 is a metal sheet or plastic sheet with a certain elasticity. When it is used, the position of the on-off contact sheet 7 is limited by the insulating sheet 6. Since the on-off contact sheet 7 can be slidably connected on the inner side of the movable groove 16, and the insulating sheet 6 plays a limiting role on the on-off contact sheet 7, when the centrifugal spring sheet 2 is misplaced under the action of the centrifugal disk 9, the dislocation movement distance of the on-off contact sheet 7 can be reduced by the insulating sheet 6, thereby reducing the probability of misalignment between the lower contact block 20 and the upper contact block 21, and improving the service life of the centrifugal sheet;

[0035] It should be noted that, in another embodiment, in order to make the relative movement of the on-off contact piece 7 smoother when the centrifugal spring piece 2 is misaligned and further reduce the degree to which the position of the on-off contact piece 7 is affected by the centrifugal spring piece 2, the movable groove 16 can be set as an arc groove, and the center of the arc is located on the central axis of the motor shaft.

[0036] Embodiment 4

[0037] This embodiment further optimizes the third embodiment. For details, please refer to Figure 1-4The motor shaft connection assembly includes a connection sleeve 12, which is fixedly connected to the middle of the top of the connection plate 14. Expansion blocks 13 are provided at both ends of the top of the connection sleeve 12. The inner side of the expansion block 13 is threadedly connected with a positioning pin 8. When installing the centrifuge, the connection sleeve 12 can be sleeved on the motor shaft, and the positioning pin 8 can be rotated by a tool so that the positioning pins 8 at both ends support and press the motor shaft, thereby positioning the connection sleeve 12 and connecting the connection sleeve 12 to the motor shaft.

[0038] Embodiment 5

[0039] In order to further improve the connection effect between the centrifuge and the motor shaft, this embodiment further optimizes the fourth embodiment, please refer to Figure 4 The motor shaft connection assembly includes a second connection sleeve 23, which is fixedly connected to the middle part of the top of the connection plate 14. Positioning cavities are formed on the inner sides of the tops of both ends of the connection sleeve 23. A positioning rod 24 is slidably connected to the inner side of the positioning cavity. A connecting rod 25 is rotatably connected to the inner side of the positioning rod 24. A positioning spring 26 is sleeved on the outer side of the connecting rod 25. The two ends of the positioning spring 26 are respectively connected to the positioning rod 24 and the connection sleeve 23 at the same end. The end of the connecting rod 25 away from the positioning rod 24 passes through the connection sleeve 23 and is fixed with a knob 27. A threaded section 28 is provided on the outer side of the end of the connecting rod 25 close to the knob 27. The connecting rod 25 is threadedly connected to the connection sleeve 23 through the threaded section 28. Specifically, positioning holes matching the positioning rod 24 are provided on both sides of the motor shaft. During installation, first manually turn the knob 27 so that the threaded section 28 is disengaged from the inner side of the second connecting sleeve 23, then the connecting rod 25 can be slidably connected with the second connecting sleeve 23, then pull the knob 27 to drive the positioning rod 24 to enter the inner side of the positioning cavity, then insert the motor shaft into the inner side of the second connecting sleeve 23, loosen the knob 27, at this time, the positioning rod 24 enters the positioning hole of the motor shaft under the action of the positioning spring 26, and the centrifuge is positioned by the cooperation between the positioning rod 24 and the positioning hole. At the same time, when the positioning rod 24 enters the positioning hole, the knob 27 can be rotated to drive the connecting rod 25 to rotate, so that the connecting rod 25 is threadedly connected with the second connecting sleeve 23 through the threaded section 28, so as to prevent the positioning rod 24 from being disengaged from the positioning hole under the action of centrifugal force, thereby further improving the positioning effect.

[0040] The use process of a motor centrifugal switch device provided by the utility model is as follows:

[0041] When using the centrifugal device, first install the centrifugal plate base 1 on the corresponding platform, then sleeve the connecting sleeve 12 on the motor shaft, and position it through the positioning pin 8; or first manually rotate the knob 27 to make the threaded section 28 disengage from the inner side of the connecting sleeve 23, then the connecting rod 25 can be slidably connected with the connecting sleeve 23, and then pull the knob 27 to drive the positioning rod 24 to enter the inner side of the positioning cavity, and then insert the motor shaft into the inner side of the connecting sleeve 23, release the knob 27, at this time, the positioning rod 24 enters the positioning hole of the motor shaft under the action of the positioning spring 26, and the centrifuge is positioned by the cooperation of the positioning rod 24 and the positioning hole. At the same time, when the positioning rod 24 enters the positioning hole, the knob 27 can be rotated to drive the connecting rod 25 to rotate, so that the connecting rod 25 is threadedly connected with the connecting sleeve 23 through the threaded section 28, thereby completing the positioning of the centrifuge and the motor shaft;

[0042] When the centrifugal spring sheet 2 moves out of position under the action of the centrifugal disk 9, the insulating sheet 6 can reduce the distance of the dislocation movement of the on-off contact sheet 7, thereby reducing the probability of dislocation between the lower contact block 20 and the upper contact block 21;

[0043] When the on-off contact piece 7 and the lower contact piece 4 are sintered together, they can be disassembled and replaced by simply removing the screws between the on-off contact piece 7 and the slider 22 and the screws between the lower contact piece 4 and the centrifugal piece base 1;

[0044] When the motor rotates at a low speed or stops rotating, the centrifugal block 10 approaches the connecting sleeve 12 or the connecting sleeve 2 23 under the action of the centrifugal spring 11. At this time, the centrifugal disc 9 presses the centrifugal spring sheet 2 through the contact pad 18 and the ball 19, so that the on-off contact sheet 7 contacts the lower contact sheet 4. At this time, the lower contact block 20 contacts the upper contact block 21, and the motor is in a powered-on state; when the motor speed reaches a certain level or exceeds a critical level, the centrifugal block 10 moves away from the connecting sleeve 12 or the connecting sleeve 2 23 under the action of the centrifugal force. At this time, the centrifugal block 10 drives the centrifugal disc 9 to move upward through the centrifugal spring 11. When the centrifugal disc 9 separates from the centrifugal spring sheet 2, the centrifugal spring sheet 2 separates the on-off contact sheet 7 from the lower contact sheet 4 under its own elastic force. At this time, the lower contact block 20 separates from the upper contact block 21, and the motor is in a powered-off state.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A motor centrifugal switch device, characterized in that: The invention comprises a centrifuge and a centrifugal piece, wherein the centrifugal piece comprises a centrifugal piece base (1) and a centrifugal spring piece (2), wherein the centrifugal spring piece (2) is riveted or screwed to the top of the centrifugal piece base (1), and an on-off contact assembly is arranged between the centrifugal piece base (1) and the centrifugal spring piece (2). The centrifuge comprises a connecting plate (14) and a centrifugal disc (9) arranged at the bottom of the connecting plate (14), a motor shaft connecting assembly is arranged in the middle of the top of the connecting plate (14), centrifugal blocks (10) are clamped on the inner sides of both sides of the connecting plate (14), centrifugal springs (11) are arranged on the outer sides of both ends of the centrifugal block (10), connecting blocks (15) are fixed at both ends of the top of the centrifugal disc (9), and the two ends of the centrifugal spring (11) are respectively fixedly connected to the corresponding centrifugal block (10) and the connecting block (15).

2. A motor centrifugal switch device according to claim 1, characterized in that: The on-off contact assembly comprises an on-off contact piece (7), an upper contact piece (3) and a lower contact piece (4) are respectively fixed on both sides of one end of the top of the centrifugal piece base (1), the on-off contact piece (7) is arranged between the upper contact piece (3) and the lower contact piece (4), an upper contact block (21) is fixed at the bottom of the on-off contact piece (7), a lower contact block (20) is fixed at the top of the lower contact piece (4) and below the upper contact block (21), a movable groove (16) is provided on the inner side of one end of the centrifugal spring piece (2) close to the on-off contact piece (7), a slider (22) is slidably connected to the inner side of the movable groove (16), the on-off contact piece (7) is fixed to the top of the slider (22) by screws, and the on-off contact piece (7) is slidably connected to the centrifugal spring piece (2) via the slider (22).

3. A motor centrifugal switch device according to claim 2, characterized in that: Contact pads (18) are fixed on both sides of the top of the centrifugal spring sheet (2), and a plurality of balls (19) are rollingly connected to the inner side of the contact pad (18).

4. A motor centrifugal switch device according to claim 2, characterized in that: The on-off contact assembly further comprises a limiting spring piece (5), the limiting spring piece (5) being fixed to the top of the centrifugal plate base (1) by means of screws and being located at one end of the on-off contact piece (7), plug-in strips (17) being fixed on both sides of the limiting spring piece (5) close to one end of the on-off contact piece (7), the plug-in strip (17) being integrally formed with the limiting spring piece (5), an insulating sheet (6) being plugged into the outer side of the plug-in strip (17), the insulating sheet (6) being made of plastic or rubber, and one end of the on-off contact piece (7) close to the insulating sheet (6) being plugged into the inner side of the insulating sheet (6).

5. The motor centrifugal switch device according to claim 1, characterized in that: The motor shaft connection assembly comprises a connection sleeve (12), wherein the connection sleeve (12) is fixedly connected to the middle of the top of the connection plate (14), and expansion blocks (13) are provided at both ends of the top of the connection sleeve (12), and the inner side of the expansion block (13) is threadedly connected with a positioning pin (8).

6. The motor centrifugal switch device according to claim 1, characterized in that: The motor shaft connection assembly comprises a second connection sleeve (23), the second connection sleeve (23) being fixedly connected to the middle of the top of the connection plate (14), a positioning cavity being formed on the inner side of the top of both ends of the second connection sleeve (23), a positioning rod (24) being slidably connected to the inner side of the positioning cavity, a connecting rod (25) being rotatably connected to the inner side of the positioning rod (24), a positioning spring (26) being sleeved on the outer side of the connecting rod (25), the two ends of the positioning spring (26) being respectively connected to the positioning rod (24) and the second connection sleeve (23) located at the same end, an end of the connecting rod (25) away from the positioning rod (24) passing through the second connection sleeve (23) and being fixed with a knob (27), a threaded section (28) being provided on the outer side of one end of the connecting rod (25) close to the knob (27), the connecting rod (25) being threadedly connected to the second connection sleeve (23) through the threaded section (28).

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