CN220856435U

CN220856435U - Centrifugal switch and single-phase motor with same

Info

Publication number: CN220856435U
Application number: CN202322510053.5U
Authority: CN
Inventors: 陈晖�
Original assignee: Ningbo Zhenhai Rongda Electrical Appliance Co ltd
Current assignee: Ningbo Zhenhai Rongda Electrical Appliance Co ltd
Priority date: 2023-09-15
Filing date: 2023-09-15
Publication date: 2024-04-26
Anticipated expiration: 2033-09-15

Abstract

The application relates to a centrifugal switch and a single-phase motor with the centrifugal switch, and relates to the technical field of control switches, wherein the centrifugal switch comprises a centrifuge and a centrifugal piece, the centrifuge comprises a centrifugal disc, a centrifugal ring and two centrifugal parts, the centrifugal parts comprise an abutting part and a rotating part fixedly connected with the abutting part, and one end of the rotating part far away from the abutting part is rotationally connected with the centrifugal disc; the centrifugal disc is provided with an elastic bending piece, the elastic bending piece comprises a first abutting part and a second abutting part which are abutted against the rotating part, an elastic included angle is formed between the first abutting part and the second abutting part, one side, away from the centrifugal ring, of the centrifugal disc is movably provided with a lifting piece, the lifting piece is provided with a lifting column abutted against the second abutting part, the lifting column is glidingly arranged in the centrifugal disc in a penetrating mode, and the centrifugal disc is provided with an adjusting mechanism for driving the lifting piece to glide. The application has the effect of improving the adaptation range of the centrifugal switch.

Description

Centrifugal switch and single-phase motor with same

Technical Field

The application relates to the technical field of control switches, in particular to a centrifugal switch and a single-phase motor with the centrifugal switch.

Background

At present, the centrifugal switch is mainly applied to a single-phase motor, and is mainly used for controlling a starting coil of the single-phase motor, namely, a centrifuge is arranged on a motor shaft of a motor rotor, a switch board is connected in series in a starting loop, and when an output shaft of the motor stops rotating, the starting circuit is conducted. When the output shaft is started and reaches a certain rotating speed, the starting circuit is disconnected, and the working circuit operates. The starting motor can effectively protect the motor from being damaged by faults such as overload, overheat, short circuit and the like, thereby prolonging the service life of the motor

Referring to fig. 1, in the related art, a centrifugal switch includes a centrifuge 1 and a centrifugal sheet 2, and the centrifugal sheet 2 is electrically connected to a start-up circuit of a single-phase motor through a wire. The centrifuge includes a centrifugal disk 4, a centrifugal ring 5 slidably provided on the centrifugal disk, and a centrifugal portion 6 for abutting against the centrifugal ring 5. The centrifugal part 6 is provided with two, and the tip of centrifugal part 6 is provided with bulge 67, wears to be equipped with bending spring 45 on the centrifugal disk 4, and bulge 67 on the centrifugal part 6 wears to locate bending spring 45's both ends respectively. Wherein the bending spring 45 is in a bent state in an unstressed state. The centrifugal plate 2 is provided with a contact piece 21 for contact with the centrifugal disk 4.

When the output shaft of the single-phase motor starts to rotate, the centrifugal part 6 is pressed against the centrifugal ring 5 by the centrifugal force, and at this time, the bending spring 45 is converted into a straight line shape. The centrifugal ring 5 and the centrifugal disk 4 are slid relatively by the pressing action of the centrifugal part 6. Since the centrifugal ring 5 is fixedly sleeved on the output shaft of the single-phase motor, the centrifugal disk 4 generates relative sliding motion relative to the output shaft of the single-phase motor at the moment. When the output shaft rotates, the centrifugal disk 4 moves towards the direction approaching the centrifugal plate 2, at this time, the centrifugal disk 4 and the centrifugal plate 2 are not mutually abutted, the abutting piece 21 is not contacted with the contact point on the centrifugal plate, and the starting circuit is disconnected. When the output shaft of the starter motor is stationary, the centrifugal disk 4 is moved away from the centrifugal blade 2, at which time the centrifugal disk 4 presses against the abutment piece 21, so that the abutment piece 21 comes into contact with the contact point on the centrifugal blade 2, so that the starter circuit is closed.

With respect to the related art in the above, the inventors found the following drawbacks: because the elastic coefficient of the bending spring is a fixed value under the general condition, the centrifugal disc can overcome the elastic force of the bending spring under the action of centrifugal force only when the output shaft of the single-phase motor reaches a specific rotating speed, so that the centrifugal disc and the abutting piece on the centrifugal piece are not abutted any more, and the starting loop is disconnected. Namely, the starting rotation speed threshold value corresponding to the centrifugal switch is a fixed value and cannot be adapted to the requirements of different single-phase motors.

Disclosure of utility model

In order to enable the centrifugal switch to be suitable for single-phase motors with different starting rotation speed requirements, the application provides the centrifugal switch and the single-phase motor with the centrifugal switch.

The application provides a centrifugal switch, which adopts the following technical scheme:

The centrifugal switch comprises a centrifugal device and a centrifugal piece, wherein the centrifugal device comprises a centrifugal disc, a centrifugal ring and two centrifugal parts which are abutted against the centrifugal ring, each centrifugal part comprises an abutting part abutted against the centrifugal piece and a rotating part fixedly connected with the abutting part, and one end of the rotating part, which is far away from the abutting part, is rotationally connected with the centrifugal disc;

The centrifugal disc is provided with an elastic bending piece, the elastic bending piece comprises a first abutting part and a second abutting part which are abutted tightly against the rotating part, an elastic included angle is formed between the first abutting part and the second abutting part, a lifting piece is movably arranged on one side, away from the centrifugal ring, of the centrifugal disc, a lifting column abutted against the second abutting part is arranged on the lifting piece, the lifting column is glidingly arranged in the centrifugal disc in a penetrating mode, and an adjusting mechanism used for driving the lifting piece to glide is arranged on the centrifugal disc.

Through adopting above-mentioned technical scheme, through the position of adjustment mechanism adjustment lifting piece, and then make second butt portion take place deformation, elasticity contained angle changes, makes the elasticity resistance of elasticity bending piece change to adjust starting rotational speed threshold value, when the output shaft reaches different rotational speeds promptly, centrifugal force effect begins to be greater than elasticity resistance, makes centrifugal disk orientation centrifugal ring's direction remove. Thereby improving the adaptation range of the centrifugal switch and enabling the centrifugal switch to be suitable for different single-phase motors.

Optionally, the adjustment mechanism include set up in screw thread post and threaded connection on the centrifugal disk screw thread cover on the screw thread post, the screw thread post keep away from the one end of centrifugal disk be used for with centrifugal piece looks butt, the tip of screw thread cover be used for with lifting piece looks butt.

Through adopting above-mentioned technical scheme, through rotating the thread bush, butt lifting spare, and then make the lifting post promote the position of second butt portion and change, adjust the elasticity resistance of elasticity bending piece.

Optionally, a marking convex point is arranged on the outer side wall of the threaded sleeve, and a scale ring corresponding to the marking convex point is arranged on the lifting piece.

Through adopting above-mentioned technical scheme, rotate the thread bush, through the correspondence of mark arch and scale ring, conveniently carry out accurate regulation to the elasticity of elasticity bending piece.

Optionally, the thread bush include with threaded post threaded connection's screwed ring and with the butt ring that the screwed ring is connected, set up on the lifting piece and supply the rotation embedding of butt ring's rotation groove.

Through adopting above-mentioned technical scheme, through the embedding of butt ring in rotating the inslot, make the threaded sleeve and lifting piece between be connected more firm.

Optionally, the first abutting portion is provided with a fixing protrusion, and the rotating portion is provided with a fixing groove in which the fixing protrusion is embedded.

By adopting the technical scheme, the first abutting part and the rotating part are not easy to slide relatively, and the stability of the position of the elastic bending piece is improved.

Optionally, a positioning protrusion is disposed on a side of the second abutting portion, which is close to the first abutting portion, and a positioning groove for embedding the positioning protrusion is formed in the centrifugal disc.

By adopting the technical scheme, the second abutting part and the centrifugal disc are not easy to move relatively, and the stability of the position of the elastic bending piece is further improved.

Optionally, the single-phase motor includes centrifugal switch and motor body, the motor body has motor casing and output shaft, centrifugal piece fixed set up in on the motor casing, the fixed cover of centrifugal ring is established on the output shaft, the cover that slides of centrifugal disk is established on the output shaft.

Optionally, the centrifugal ring is in interference fit with the output shaft.

Optionally, a connecting key slot is arranged on the inner side wall of the centrifugal ring, and a connecting key embedded in the connecting key slot is arranged on the outer side wall of the output shaft.

By adopting the technical scheme, relative rotation between the centrifugal ring and the output shaft is difficult to occur.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The elastic value of the elastic bending piece is adjusted by adjusting the position of the lifting piece, so that the adaptation range of the centrifugal switch is improved;

2. The elastic resistance of the elastic bending piece is conveniently and accurately adjusted by marking the convex points and the scale rings;

3. The fixing protrusions are embedded into the fixing grooves, and the positioning protrusions are embedded into the positioning grooves, so that the stability of the positions of the elastic bending sheets is improved.

Drawings

Fig. 1 is a schematic diagram of a centrifugal switch in the background art.

Fig. 2 is a schematic view of a centrifuge according to an embodiment of the present application.

Fig. 3 is a schematic view of the overall structure of a centrifugal sheet in an embodiment of the application.

Fig. 4 is a schematic view of an exploded structure of a centrifugal disk, a threaded column, and a threaded sleeve in an embodiment of the present application.

Fig. 5 is a schematic view of an exploded construction of a centrifugal disk, a lifting member, a threaded post and a threaded sleeve in an embodiment of the present application.

FIG. 6 is a cross-sectional view of a centrifugal disk, resilient bending tabs, a rotating portion, and a lifting member in an embodiment of the application.

Fig. 7 is an exploded view of a centrifugal disk and a centrifugal core in an embodiment of the application.

Fig. 8 is a schematic diagram of an exploded structure of a single-phase motor according to an embodiment of the present application.

Reference numerals illustrate: 1. a centrifuge; 2. centrifugal sheets; 21. a contact piece; 22. abutting the column; 23. an upper contact; 24. a lower contact; 25. an electrical connection screw; 3. a motor body; 31. a motor housing; 32. an output shaft; 33. a connecting key; 4. a centrifugal disc; 41. a slip hole; 42. a positioning groove; 43. a positioning sheet; 44. an anti-falling block; 45. a bending spring; 5. a centrifugal ring; 51. a sliding groove; 52. a connecting key groove; 6. a core; 61. an abutting portion; 62. a rotating part; 621. a fixing groove; 63. a weight plate; 64. a sliding piece; 65. a butt joint hook; 66. a slip groove; 67. a protruding portion; 7. an elastic bending piece; 71. a first abutting portion; 711. a fixing protrusion; 72. a second abutting portion; 721. positioning the bulge; 73. an elastic included angle; 8. a lifting member; 81. lifting the column; 82. a scale ring; 83. a rotating groove; 9. an adjusting mechanism; 91. a threaded column; 92. a thread sleeve; 921. marking the salient points; 922. a threaded ring; 923. abutting the ring.

Detailed Description

The application is described in further detail below with reference to fig. 2-8.

The embodiment of the application discloses a centrifugal switch and a single-phase motor with the centrifugal switch. The single-phase motor has a motor housing 31 and an output shaft 32, and a centrifugal switch is used to control the closing and opening of a starting circuit in the single-phase motor.

Referring to fig. 2 and 3, the centrifugal switch includes a centrifuge 1 and a centrifugal piece 2, and the centrifuge 1 includes a centrifugal disk 4 slidably fitted on an output shaft 32, a centrifugal ring 5 fixedly fitted on the output shaft 32, and a centrifugal portion 6 abutting against the centrifugal ring 5. The centrifugal portion 6 includes an abutment portion 61 that abuts against the centrifugal piece 2 and two rotating portions 62. The two rotating portions 62 are integrally connected to both ends of the abutting portion 61, respectively. The end of the rotating portion 62 remote from the abutment portion 61 is hinged to the centrifugal disk 4. In this embodiment, since two centrifugal portions 6 are provided, four rotating portions 62 are provided in total.

Referring to fig. 2 and 4, the centrifugal disk 4 is provided with an elastic bending piece 7, and the elastic bending piece 7 includes a first abutting portion 71 abutting against the rotating portion 62 and a second abutting portion 72 integrally connected to the first abutting portion 71. An elastic angle 73 is formed between the second abutting portion 72 and the first abutting portion 71, and the elastic angle 73 is an acute angle. The centrifugal disk 4 is provided with lifting piece 8 in the activity of the side of keeping away from the centrifugal ring 5, is provided with the lifting post 81 with the butt of second butt portion 72 on the lifting piece 8, has offered the slip hole 41 that supplies lifting post 81 to slide and wear to establish on the centrifugal disk 4. Meanwhile, an adjusting mechanism 9 for driving the lifting piece 8 to slide is arranged on the centrifugal disc 4.

Referring to fig. 4 and 5, the adjusting mechanism 9 includes a screw post 91 provided on a side of the centrifugal disk 4 remote from the centrifugal ring 5, and a screw sleeve 92 screwed to the screw post 91. The end of the threaded post 91 is used to abut against the lifting element 8, so as to push the lifting element 8 to move, and further slide the lifting post 81 through the sliding hole 41.

In this embodiment, the lifting member 8 is annular, and the lifting member 8 is slidably sleeved on the outer side of the threaded post 91. Four lifting columns 81 are provided on one lifting element 8, and correspondingly four sliding holes 41 are also provided.

Referring to fig. 3 and 4, the centrifugal sheet 2 is elastically provided with a contact piece 21, and the contact piece 21 is integrally connected to the centrifugal sheet 2. The abutment piece 21 is provided with an abutment post 22 for abutment with an end of the threaded post 91 remote from the centrifugal disk 4. The centrifugal blade 2 is provided with an upper contact 23, a lower contact 24 and two electrical connection screws 25. The electric connection screw 25 is used to fix the wire to the centrifugal blade 2 so that the centrifugal blade 2 is electrically connected in the starting circuit of the single-phase motor. The starting circuit of the single-phase motor is in the prior art, and details are not repeated in this implementation. When the contact piece 21 is contacted with the lower contact 24 under the action of external force, the contact piece 21 is contacted with the lower contact 24, and at the moment, the two wires corresponding to the two electric connection screws 25 are connected electrically, so that the starting circuit of the single-phase motor is closed. When the abutting piece 21 is not acted by external force, the abutting piece 21 abuts against the upper contact 23, at the moment, the two wires corresponding to the electric connection screw 25 are not mutually and electrically connected, the starting circuit is disconnected, and the single-phase motor enters a normal working state.

When the output shaft 32 starts to rotate and reaches the starting rotation speed threshold, the abutment 61 abuts against the centrifugal ring 5 under the centrifugal force, so that the abutment 61 has a movement tendency to push the centrifugal ring 5 toward the centrifugal disk 4. At this time, the rotating portion 62 rotates relative to the centrifugal disk 4. Since the centrifugal ring 5 is fixedly connected to the output shaft 32, and there is a tendency of movement between the centrifugal ring 5 and the centrifugal disk 4 toward each other under the action of centrifugal force, the position of the centrifugal ring 5 is fixed at this time, and the centrifugal disk 4 moves toward the centrifugal ring 5. At this time, the centrifugal disk 4 is no longer in contact with the contact piece 21, and the starting circuit of the single-phase motor is disconnected. When the output shaft 32 is stationary or the rotation speed is small, the centrifugal force applied to the abutting portion 61 is small, and the initial elastic resistance of the elastic bending piece 7 cannot be overcome. At this time, the distance between the centrifugal ring 5 and the centrifugal disk 4 is large, the centrifugal disk 4 still abuts against the abutment piece 21 on the centrifugal piece 2, and the starting circuit is in a closed state. When the single-phase motor is not connected with the power supply, no current flows even though the starting circuit is in an on state.

When the lifting column 81 slides through the sliding hole 41, the pressing force of the lifting column 81 to the second abutting portion 72 changes, and the size of the elastic included angle 73 changes, so that the elastic force of the elastic bending piece 7 is adjusted. At this time, the rotation speed of the output shaft 32 needs to reach a new starting rotation speed threshold value to adjust and control the on/off of the centrifugal switch. Because the starting rotation speed requirements of different motors are different, in this embodiment, the elastic included angle 73 of the elastic bending piece 7 is adjusted to adjust the elastic force applied by the first abutting portion 71 to the rotating portion 62, so as to adjust the starting rotation speed threshold value, and expand the application range of the centrifugal switch.

Referring to fig. 4, the outer sidewall of the screw sleeve 92 is provided with a marking protrusion 921, and the elevating member 8 is provided with a scale ring 82 corresponding to the marking protrusion 921. In the process of rotating the thread bush 92, the rotation angle of the thread bush 92 is known through the corresponding relation between the mark protruding points 921 and the scale ring 82.

Referring to fig. 4 and 5, the screw sleeve 92 includes a screw ring 922 screwed to the screw post 91 and an abutment ring 923 integrally connected to the screw ring 922. The lifting member 8 is provided with two rotating grooves 83 for the abutting ring 923 to rotate and embed, the rotating grooves 83 are arc-shaped, and the rotating grooves 83 are provided with two.

Referring to fig. 6, a fixing protrusion 711 is integrally connected to the first abutting portion 71, and a fixing groove 621 into which the fixing protrusion 711 is fitted is formed in the rotating portion 62. The fixing protrusion 711 is inserted into the fixing groove 621, so that the first contact portion 71 can be better abutted against the rotating portion 62, and the relative sliding is less likely to occur. Meanwhile, a positioning protrusion 721 is disposed on a side of the second abutting portion 72 near the first abutting portion 71, and a positioning groove 42 into which the positioning protrusion 721 is embedded is formed on the centrifugal disk 4, so that the second abutting portion 72 is not easy to slide relatively to the centrifugal disk 4. The volume of the positioning groove 42 is larger than that of the positioning protrusion 721, so that the positioning protrusion 721 is not easy to interfere with the groove wall of the positioning groove 42 during the rotation of the second abutting portion 72.

Referring to fig. 7, a weight plate 63 is fixedly attached to the abutting portion 61 by a rivet to increase centrifugal force and thus the urging force of the abutting portion 61 against the centrifugal ring 5. Two sliding grooves 51 are oppositely arranged on the centrifugal ring 5 in a propping way, a sliding piece 64 which slides in the sliding groove 51 is integrally connected to the propping part 61, and two sides of the sliding piece 64 are welded and provided with propping hooks 65 propping against the back of the centrifugal ring 5. A sliding groove 66 for sliding the centrifugal ring 5 is formed between the abutting hook 65 and the abutting portion 61. In this embodiment, the sliding piece 64 and the sliding groove 66 adopt a clearance fit manner, that is: during the rotation of the rotating portion 62, the abutting portion 61 can perform a relative sliding movement with the centrifugal ring 5, and the sliding piece 64 is less likely to interfere with the groove wall of the sliding groove 66.

Referring to fig. 7, two symmetrically arranged positioning pieces 43 are provided on the centrifugal disk 4, and the centrifugal ring 5 slides between the two positioning pieces 43. Meanwhile, an anti-drop block 44 for abutting against the centrifugal ring 5 is welded on the positioning piece 43.

Referring to fig. 8, the single-phase motor is further described in this embodiment based on the centrifugal switch. The single-phase motor includes the centrifugal switch described above and the motor body 3. The motor body 3 has a motor case 31 and an output shaft 32. The centrifugal plate 2 is fixedly arranged outside the motor shell 31, the centrifugal ring 5 is fixedly sleeved on the output shaft 32, and the centrifugal disk 4 is slidably sleeved on the output shaft 32.

In one embodiment, the eccentric ring 5 is welded to the output shaft 32. In this embodiment, the output shaft 32 is in interference fit with the centrifugal ring 5. Further, the outer side wall of the output shaft 32 is integrally connected with a connecting key 33, and the inner side wall of the centrifugal ring 5 is provided with a connecting key slot 52 for embedding the connecting key 33, so that the output shaft 32 and the centrifugal ring 5 are not easy to generate relative rotation.

The working principle of the single-phase motor provided by the embodiment of the application is as follows: the initial position of the second abutting portion 72 is adjusted through the adjusting mechanism 9, the initial included angle of the elastic included angle 73 is adjusted, the initial elastic value of the elastic bending piece 7 is adjusted, when the rotating speed of the output shaft 32 reaches the starting rotating speed threshold value, the centrifugal force is acted to be larger than the resistance generated by the elastic bending piece 7, the position of the centrifugal disc 4 starts to move, and the abutting piece 21 starts to be separated from the lower contact 24. When the contact piece 21 starts to separate from the lower contact 24, the contact piece 21 does not immediately contact with the upper contact 23, and the contact piece 21 is located between the upper contact 23 and the lower contact 24, at which time the start circuit is already in an open state. When the centrifugal disk 4 continues to move in the direction of the centrifugal ring 5, the abutment piece 21 comes into contact with the upper contact 23, at which point the starting circuit stabilizes in the open state. The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. Centrifugal switch, including centrifuge (1) and centrifugal piece (2), centrifuge (1) include centrifugal disk (4), centrifugal ring (5) and two with centrifugal portion (6) of centrifugal ring (5) looks butt, its characterized in that: the centrifugal part (6) comprises an abutting part (61) abutted against the centrifugal piece (2) and a rotating part (62) fixedly connected with the abutting part (61), and one end of the rotating part (62) away from the abutting part (61) is rotationally connected with the centrifugal disc (4);

Be provided with elasticity bending piece (7) on centrifugal disk (4), elasticity bending piece (7) include with first butt portion (71) and second butt portion (72) that rotation portion (62) supported tightly, first butt portion (71) with form elasticity contained angle (73) between second butt portion (72), centrifugal disk (4) are kept away from one side activity of centrifugal ring (5) is provided with lifting piece (8), be provided with on lifting piece (8) with lifting post (81) of second butt portion (72) butt, lifting post (81) slip wears to locate in centrifugal disk (4), be provided with on centrifugal disk (4) and be used for driving lifting piece (8) sliding motion's adjustment mechanism (9).

2. The centrifugal switch of claim 1, wherein: the adjusting mechanism (9) comprises a threaded column (91) arranged on the centrifugal disc (4) and a threaded sleeve (92) in threaded connection with the threaded column (91), one end, away from the centrifugal disc (4), of the threaded column (91) is used for being abutted to the centrifugal disc (2), and the end portion of the threaded sleeve (92) is used for being abutted to the lifting piece (8).

3. A centrifugal switch according to claim 2, wherein: the outer side wall of the thread sleeve (92) is provided with a marking convex point (921), and the lifting piece (8) is provided with a scale ring (82) corresponding to the marking convex point (921).

4. A centrifugal switch according to claim 2, wherein: the thread sleeve (92) comprises a thread ring (922) in threaded connection with the thread column (91) and an abutting ring (923) connected with the thread ring (922), and a rotating groove (83) for embedding rotation of the abutting ring (923) is formed in the lifting piece (8).

5. The centrifugal switch of claim 1, wherein: the first abutting part (71) is provided with a fixing protrusion (711), and the rotating part (62) is provided with a fixing groove (621) for embedding the fixing protrusion (711).

6. The centrifugal switch of claim 1, wherein: a positioning protrusion (721) is arranged on one side, close to the first abutting portion (71), of the second abutting portion (72), and a positioning groove (42) for embedding the positioning protrusion (721) is formed in the centrifugal disc (4).

7. A single-phase motor, characterized in that: the centrifugal switch comprises any one of claims 1-6 and a motor body (3), wherein the motor body (3) is provided with a motor shell (31) and an output shaft (32), the centrifugal piece (2) is fixedly arranged on the motor shell (31), the centrifugal ring (5) is fixedly sleeved on the output shaft (32), and the centrifugal disc (4) is slidably sleeved on the output shaft (32).

8. The single-phase motor of claim 7, wherein: the eccentric ring (5) is in interference fit with the output shaft (32).

9. The single-phase motor of claim 7, wherein: a connecting key groove (52) is formed in the inner side wall of the centrifugal ring (5), and a connecting key (33) embedded into the connecting key groove (52) is formed in the outer side wall of the output shaft (32).