CN218482142U

CN218482142U - Rotary switch for three-phase asynchronous motor

Info

Publication number: CN218482142U
Application number: CN202222691779.9U
Authority: CN
Inventors: 胡新旺; 薛智文; 薛智博; 叶晨诚
Original assignee: Yueqing Niufulai Electronics Co ltd
Current assignee: Yueqing Niufulai Electronics Co ltd
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2023-02-14
Anticipated expiration: 2032-10-12

Abstract

The application relates to a rotary switch for a three-phase asynchronous motor, which comprises a shell, a rotating shaft, a plurality of groups of contact assemblies and an adjusting assembly, wherein the rotating shaft is rotatably arranged in the shell in a penetrating manner; the contact assembly comprises a plurality of static contacts, a plurality of movable contacts, a plurality of static pins and movable pins, the movable contacts are used for being in contact with the static contacts, the static pins are used for being connected with the static contacts, the movable pins are used for being connected with the movable contacts, the static contacts, the movable contacts and the static pins are in the same number and are in one-to-one correspondence, one ends, far away from the corresponding static contacts, of the movable contacts are connected to the same movable pins, a cam is arranged on the side wall of the rotating shaft, a yielding groove is formed in the circumferential side wall of the cam, the movable contacts are in contact with the circumferential outer side wall of the cam, the movable contacts move towards the direction close to or far away from the static contacts by rotating the cam, and the adjusting assembly is used for limiting rotation of the rotating shaft. The three-phase asynchronous motor gear shifting device has the effect of facilitating the switching of a plurality of fixed gears of a three-phase asynchronous motor in a working circuit.

Description

Rotary switch for three-phase asynchronous motor

Technical Field

The application relates to the field of three-phase asynchronous motors, in particular to a rotary switch for a three-phase asynchronous motor.

Background

The three-phase asynchronous motor is one kind of induction motor, and is one kind of motor powered by 380V three-phase AC current. The three-phase asynchronous motor consists of two basic parts, a fixed stator and a rotating rotor, the rotor is arranged in the inner cavity of the stator and is supported on two end covers by bearings. The rotor and stator rotating magnetic field of the three-phase asynchronous motor rotate in the same direction and at different rotating speeds, and the slip ratio exists, so the three-phase asynchronous motor is called.

In the related art, if the rotating speed of the three-phase asynchronous motor is to be adjusted, a three-phase speed regulator is mostly required to be additionally configured, the three-phase speed regulator is a device for converting a power frequency power supply into alternating current power supplies with various frequencies so as to realize variable-speed operation of the motor, and the requirements on different rotating speeds of the three-phase asynchronous motor are met by rotating a knob on the three-phase speed regulator and adjusting the three-phase speed regulator to a proper position.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when only a plurality of fixed gears of the three-phase asynchronous motor need to be switched in a working circuit, the whole cost of the circuit is improved by additionally arranging and installing a three-phase speed regulator, and the fixed gears are difficult to be switched instantly by rotating a knob on the three-phase speed regulator during adjustment.

SUMMERY OF THE UTILITY MODEL

In order to facilitate switching of several gears fixed on a three-phase asynchronous motor in a working circuit, the application provides a rotary switch for the three-phase asynchronous motor.

The application provides a rotary switch for three-phase asynchronous machine adopts following technical scheme:

a rotary switch for a three-phase asynchronous motor comprises a shell, a rotating shaft, a plurality of groups of contact assemblies and an adjusting assembly, wherein the rotating shaft is rotatably arranged in the shell in a penetrating manner; the contact assembly comprises a plurality of static contacts, a plurality of movable contacts contacted with the static contacts, a plurality of static pins connected with the static contacts and movable pins connected with the movable contacts, the static pins and the movable pins penetrate out of the shell and are connected with an external circuit, the static contacts, the movable contacts and the static pins are in the same one-to-one correspondence, one ends, far away from the corresponding static contacts, of the movable contacts are connected to the same movable pins, a cam is arranged on the side wall of the rotating shaft, a stepping groove is formed in the circumferential side wall of the cam, the movable contacts are in contact with the circumferential outer side wall of the cam, the movable contacts move towards the direction close to or far away from the static contacts by rotating the cam, and the adjusting assembly is used for limiting rotation of the rotating shaft.

By adopting the technical scheme, when the movable contact piece is abutted against the outer side wall of the cam, the movable contact piece and the static contact piece are kept separated, and the circuit is in a disconnected state; when the movable contact piece is abutted against the side wall of the abdicating groove, the movable contact piece is kept in contact with the static contact piece, and the circuit is in a closed state; each static pin is connected with an external resistor in series, and the dynamic pin is used for being connected with a three-phase asynchronous motor; when the rotating speed of the three-phase asynchronous motor needs to be adjusted, the rotating shaft is rotated to drive the cam to rotate together, so that switching of the conduction or disconnection states of the movable contact piece and the static contact piece is controlled, and the resistance value of the resistor connected into a circuit is changed due to the fact that the conduction or disconnection states of the movable contact piece and the static contact piece are different, so that the voltage value is changed along with the adjustment of the resistor, and finally gear adjustment of the rotating speed of the motor is achieved; compared with the additional installation of a frequency converter, the fixed gear can be switched by rotating the switch, so that the overall production cost can be reduced; meanwhile, the rotating angle is limited through the adjusting assembly in the rotating process, so that a worker can visually see the rotating speed gear state of the three-phase asynchronous motor.

Optionally, be provided with the adjustable ring on the pivot lateral wall, the adjustment tank has been seted up on the adjustable ring circumference lateral wall, adjusting part is including setting up the expanding spring in the casing and being used for the regulating block with the laminating of adjustment tank lateral wall, expanding spring is used for compressing tightly the regulating block in the adjustment tank.

Through adopting above-mentioned technical scheme, when rotating the pivot and driving the adjustable ring and rotate, expanding spring is in by compression state, and when rotating suitable angle, under expanding spring's elasticity effect, the regulating block will laminate and compress tightly in the adjustment tank to the rotation of prevention pivot can be realized fixing the pivot in required position.

Optionally, an accommodating cavity is formed in the inner side wall of the shell, and the telescopic spring is located in the accommodating cavity.

Through adopting above-mentioned technical scheme, through holding the intracavity with expanding spring setting, can vice god do the spring and play spacing effect to stability when improving expanding spring and stretching out and drawing back.

Optionally, the adjusting assembly further includes a protrusion disposed on the rotating shaft, and a stopper is disposed on an inner side wall of the housing and located on a rotation path of the protrusion.

By adopting the technical scheme, when the rotating shaft drives the lug to rotate together, the lug rotates to the joint with the stop block, and the stop block can limit the lug to continue rotating, so that the rotating range of the rotating shaft is limited by the limiting effect of the stop block.

Optionally, a handle which is coaxially arranged with the rotating shaft is inserted into the rotating shaft, one end of the handle is inserted into the rotating shaft, the other end of the handle penetrates out of the shell, a limiting strip is arranged on the inner side wall, facing the handle, of the rotating shaft, and a limiting groove is formed in one end, inserted into the rotating shaft, of the handle.

Through adopting above-mentioned technical scheme, when the handle inserted to the pivot in, spacing inserted to the spacing inslot, through the joint cooperation of spacing and spacing groove to realize that the staff can drive the pivot through twist grip and rotate together.

Optionally, the handle is polygonal along a cross section perpendicular to the axial direction, and an inner cavity of the rotating shaft is matched with the handle.

Through adopting above-mentioned technical scheme, can prevent the relative rotation between handle and the pivot to improve the relative stability between handle and the pivot.

Optionally, an elastic fixture block is arranged on the outer side wall of one end, located in the rotating shaft, of the handle, and a clamping groove for the fixture block to be inserted is formed in the rotating shaft.

Through adopting above-mentioned technical scheme, when installing the handle to the pivot in, the fixture block receives elastic deformation, when the handle stretches into in the pivot until the fixture block is located the draw-in groove, through the joint cooperation of fixture block and draw-in groove, can prevent that the handle breaks away from the direction and the pivot of installation.

Optionally, a through hole for the handle to penetrate out is arranged outside the shell, a clamping ring is arranged at one end of the handle, which is located outside the shell, the clamping ring and the handle are coaxially arranged, and the diameter of the clamping ring is larger than that of the through hole.

Through adopting above-mentioned technical scheme, when the handle inserted to the pivot in, snap ring and topic lateral wall laminated each other this moment to inside the prevention handle continued to go deep into the pivot, played spacing effect.

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

1. the fixed gears can be switched by rotating the switch, so that the overall production cost can be reduced;

2. the rotating speed gear state of the three-phase asynchronous motor can be visually seen by a worker;

3. the rotation of pivot can be prevented, the pivot can be realized fixing required position.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is an exploded view of an embodiment of the present application after the enclosure is concealed;

FIG. 3 is a cross-sectional view of the embodiment of the present application highlighting the extension spring and the adjustment block;

FIG. 4 is an exploded view of an embodiment of the subject application after concealing the contact assembly;

FIG. 5 is a cross-sectional view of the embodiment of the present application highlighting the spacing bar and the spacing groove.

Description of reference numerals: 1. a housing; 11. an accommodating chamber; 12. a stopper; 13. a through hole; 2. a rotating shaft; 21. a cam; 211. a yielding groove; 22. an adjusting ring; 221. an adjustment groove; 23. a limiting strip; 24. a card slot; 3. a contact assembly; 31. a static contact piece; 32. a movable contact piece; 33. a static pin; 34. a movable pin; 4. an adjustment assembly; 41. a tension spring; 42. an adjusting block; 43. a bump; 5. a handle; 51. a limiting groove; 52. a clamping block; 53. a snap ring.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a rotary switch for a three-phase asynchronous motor. Referring to fig. 1 and 2, a rotary switch for a three-phase asynchronous motor includes a housing 1, a rotating shaft 2 rotatably disposed in the housing 1, and a plurality of sets of contact assemblies 3 disposed in the housing 1.

Referring to fig. 2, the number of the contact assemblies 3 in the embodiment of the present application is 4, two of them are located above the inside of the housing 1, and the other two are symmetrically arranged below the housing 1, and each contact assembly 3 includes a static contact piece 31, a movable contact piece 32 for contacting with the static contact piece 31, a static pin 33 for connecting with the static contact piece 31, and a movable pin 34 for connecting with the movable contact piece 32. The static pin 33 and the dynamic pin 34 both extend out of the housing 1 and are used for connecting with external circuits. The fixed pins 33 are arranged in sequence along the axial direction of the rotating shaft 2, and each movable contact piece 32 is arranged along the circumferential direction perpendicular to the rotating shaft 2. The number of the static contact pieces 31, the movable contact pieces 32 and the static pins 33 in each group of contact assemblies 3 is three, and the static contact pieces, the movable contact pieces and the static pins correspond to one another. The ends of the three movable contacts 32 in the same group, which are far away from the corresponding static contact 31, are all connected to the same movable pin 34.

Referring to fig. 2, a cam 21 is integrally formed on a side wall of the rotating shaft 2, a relief groove 211 is formed on a circumferential side wall of the cam 21, and the movable contact 32 abuts against the cam 21 or a side wall of the relief groove 211. The movable contact piece 32 is moved in a direction to approach or separate from the stationary contact piece 31 by rotating the cam 21. When the movable contact piece 32 is contacted with the side wall of the cam 21, the movable contact piece 32 and the static contact piece 31 are in a separated state; when the movable contact piece 32 is contacted with the side wall of the relief groove 211, the movable contact piece 32 is contacted with the static contact piece 31.

Referring to fig. 3, the adjusting ring 22 is integrally formed on the outer side wall of the rotating shaft 2, and an adjusting groove 221 is formed on the circumferential outer side wall of the adjusting ring 22. An accommodating cavity 11 is formed in the inner side wall of the shell 1. The rotary switch further comprises an adjusting component 4 used for limiting the rotation of the rotating shaft 2, the adjusting component 4 comprises a telescopic spring 41 located in the accommodating cavity 11 and an adjusting block 42 used for being attached to the side wall of the adjusting groove 221, one end of the telescopic spring 41 is connected with the side wall of the accommodating cavity 11, and the other end of the telescopic spring 41 is connected with the adjusting block 42. The extension spring 41 extends and contracts in a direction in which the adjusting block 42 approaches or moves away from the adjusting groove 221, and the extension spring 41 serves to press the adjusting block 42 in the adjusting groove 221.

Referring to fig. 4, the adjusting assembly 4 further includes a protrusion 43 integrally formed on the outer side wall of the rotating shaft 2, the adjusting ring 22 is disposed at one end of the rotating shaft 2 located in the housing 1, and the protrusion 43 is disposed at the other end of the rotating shaft 2 located in the housing 1. A stopper 12 is integrally formed on an inner side wall of the housing 1 facing the projection 43, and the stopper 12 is located on a rotation path of the projection 43.

Referring to fig. 4, a through hole 13 communicated with the inner cavity is formed in the side wall of the shell 1, and a handle 5 coaxially arranged with the rotating shaft 2 is inserted in the rotating shaft 2. One end of the handle 5 is inserted in the rotating shaft 2, and the other end of the handle 5 penetrates through the through hole 13 and penetrates out of the shell 1. The handle 5 is located the outer one end integrated into one piece of casing 1 and has snap ring 53, and snap ring 53 is coaxial setting and the diameter of snap ring 53 is greater than the diameter of through-hole 13 with handle 5. When the handle 5 is inserted into the rotating shaft 2, the snap ring 53 is attached to the side wall of the housing 1.

Referring to fig. 5, pivot 2 has spacing 23 towards integrated into one piece on the inside wall of handle 5, and handle 5 has seted up spacing groove 51 on inserting the one end lateral wall of pivot 2, and spacing groove 51 is used for supplying handle 5 to insert the cooperation of pegging graft with spacing 23 in the pivot 2. The handle 5 is arranged in a polygonal shape along the section perpendicular to the circumferential direction, and the inner cavity of the rotating shaft 2 is matched with the handle 5.

Referring to fig. 3, an elastic latch 52 is integrally formed on a side wall of one end of the handle 5 located in the rotating shaft 2, and a slot 24 for inserting the latch 52 is formed in the rotating shaft 2.

The implementation principle of the rotary switch for the three-phase asynchronous motor in the embodiment of the application is as follows: when the movable contact piece 32 is abutted against the outer side wall of the cam 21, the movable contact piece 32 is kept separated from the static contact piece 31, and the circuit is in a disconnected state; when the movable contact piece 32 is abutted against the side wall of the receding groove 211, the movable contact piece 32 is kept in contact with the static contact piece 31, and the circuit is in a closed state; each static pin 33 is connected with an external resistor in series, and the dynamic pin 34 is used for being connected with a three-phase asynchronous motor; when the rotating speed of the three-phase asynchronous motor needs to be adjusted, the rotating shaft 2 is rotated to drive the cam 21 to rotate together, so that switching of the conduction or disconnection states of the movable contact piece 32 and the static contact piece 31 is controlled, and the resistance value of a resistor in an access circuit is changed due to the fact that the conduction or disconnection states of the movable contact piece 32 and the static contact piece 31 are different, so that the voltage value is changed along with the adjustment of the resistor, and finally gear adjustment of the rotating speed of the motor is achieved; compared with the additional installation of a frequency converter, the fixed gear can be switched by rotating the switch, so that the overall production cost can be reduced; meanwhile, the rotating angle is limited by the adjusting component 4 in the rotating process, so that a worker can visually see the rotating speed gear state of the three-phase asynchronous motor.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A rotary switch for a three-phase asynchronous machine, characterized in that: comprises a shell (1), a rotating shaft (2) rotatably arranged in the shell (1), a plurality of groups of contact assemblies (3) positioned in the shell (1) and an adjusting assembly (4); the contact assembly (3) comprises a plurality of static contacts (31), a plurality of movable contacts (32) which are used for being in contact with the static contacts (31), a plurality of static pins (33) which are used for being connected with the static contacts (31) and movable pins (34) which are used for being connected with the movable contacts (32), the static contacts (31), the movable contacts (32) and the static pins (33) are the same in number and correspond to one another one by one, one ends, far away from the corresponding static contacts (31), of the movable contacts (32) are connected to the same movable pin (34), a cam (21) is arranged on the side wall of the rotating shaft (2), a yielding groove (211) is formed in the circumferential side wall of the cam (21), the movable contacts (32) are abutted to the circumferential outer side wall of the cam (21), the movable contacts (32) move towards the direction close to or far away from the static contacts (31) by rotating the cam (21), and the adjusting assembly (4) is used for limiting rotation of the rotating shaft (2).

2. A rotary switch for a three-phase asynchronous machine according to claim 1, characterized in that: be provided with on pivot (2) lateral wall adjustable ring (22), adjustable groove (221) have been seted up on adjustable ring (22) circumference lateral wall, adjusting part (4) including setting up expanding spring (41) in casing (1) and be used for adjusting block (42) of laminating mutually with adjustable groove (221) lateral wall, expanding spring (41) are used for compressing tightly adjusting block (42) in adjustable groove (221).

3. A rotary switch for a three-phase asynchronous machine according to claim 2, characterized in that: seted up on casing (1) inside wall and held chamber (11), expanding spring (41) are located and hold chamber (11).

4. A rotary switch for a three-phase asynchronous machine according to claim 2, characterized in that: the adjusting assembly (4) further comprises a protruding block (43) arranged on the rotating shaft (2), a stop block (12) is arranged on the inner side wall of the shell (1), and the stop block (12) is located on a rotating path of the protruding block (43).

5. A rotary switch for three-phase asynchronous machines, according to claim 1, characterized in that: pivot (2) interpolation is equipped with handle (5) that are coaxial setting with pivot (2), handle (5) one end is inserted and is established in pivot (2), outside handle (5) other end was worn out to casing (1), pivot (2) are provided with spacing (23) on the inside wall towards handle (5), the one end that handle (5) inserted in pivot (2) is provided with spacing groove (51).

6. A rotary switch for a three-phase asynchronous machine according to claim 5, characterized in that: the handle (5) is polygonal along the section perpendicular to the axial direction, and the inner cavity of the rotating shaft (2) is matched with the handle (5).

7. A rotary switch for a three-phase asynchronous machine according to claim 5, characterized in that: the handle (5) is provided with a fixture block (52) with elasticity on the outer side wall of one end positioned in the rotating shaft (2), and a clamping groove (24) for inserting the fixture block (52) is formed in the rotating shaft (2).

8. A rotary switch for a three-phase asynchronous machine according to claim 7, characterized in that: the handle is characterized in that a through hole (13) for the handle (5) to penetrate out is formed in the outer portion of the shell (1), a clamping ring (53) is arranged at one end, located outside the shell (1), of the handle (5), and the clamping ring (53) and the handle (5) are coaxially arranged, and the diameter of the clamping ring (53) is larger than that of the through hole (13).