An auxiliary contact structure and motor protector

Abstract

An auxiliary contact structure and motor protector, comprising a shell, a circuit board, a terminal assembly, a micro switch and an auxiliary rotating shaft arranged in the shell, the terminal assembly and the micro switch being electrically connected to the circuit board, the auxiliary rotating shaft being provided with a first driving part for driving cooperation with the micro switch and a first driven part for driving the auxiliary rotating shaft to rotate on the axial side of the auxiliary rotating shaft, the auxiliary rotating shaft rotating to drive the micro switch to switch states through the first driving part, the longest axial distance of the auxiliary rotating shaft being greater than the longest radial distance, the terminal assembly and the micro switch being arranged on two surfaces of the circuit board, the axial direction of the auxiliary rotating shaft being parallel to the length direction of the circuit board, and the first driving part being opposite to the micro switch. The longer axial length of the auxiliary rotating shaft can ensure that the auxiliary rotating shaft is more stable and reliable in rotation, and the micro switch with a higher shell protection level is arranged to avoid that dust, salt mist and other pollutants enter the product interior during the use of the product.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to an auxiliary contact structure and a motor protector. Background Technology

[0002] Auxiliary contacts for low-voltage electrical appliances have a wide range of applications. They are used in conjunction with the main body of the low-voltage electrical appliance to monitor its working status. They are often used by customers for signal feedback or alarms. There are many types of auxiliary contacts with different structures.

[0003] Currently, the most mainstream auxiliary contact signal switching on the market relies on traditional mechanical contacts to achieve circuit switching. This structure's driving process is not stable enough, the connection is complex, and in dusty or salt spray environments, due to the low protection level of the product's outer casing, dust, salt spray, and other contaminants can enter the product during use, affecting the reliability of the contact switching. Utility Model Content

[0004] The purpose of this utility model is to overcome at least one defect of the prior art and provide an auxiliary contact structure and a motor protector.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this application provides an auxiliary contact structure, including a housing, and a circuit board, a terminal assembly, a micro switch, and an auxiliary shaft disposed within the housing. The terminal assembly and the micro switch are electrically connected to the circuit board. The axial side of the auxiliary shaft is provided with a first driving part that cooperates with the micro switch and a first driven part for driving the auxiliary shaft to rotate. The rotation of the auxiliary shaft drives the micro switch to switch states through the first driving part. The longest axial distance of the auxiliary shaft is greater than the longest radial distance. The terminal assembly and the micro switch are respectively disposed on two sides of the circuit board, and the axial direction of the auxiliary shaft is parallel to the length direction of the circuit board. The first driving part is opposite to the micro switch.

[0007] In one possible implementation, the auxiliary shaft is an axially extending strip-shaped structure, and the contact surface between the first drive unit and the micro switch is an inclined slope or arc surface.

[0008] In one possible implementation, the length of the first driven part along the axial direction of the auxiliary rotating shaft is M, the longest spacing along the axial direction of the auxiliary rotating shaft is N, the length of the circuit board is Z, 0.5N≤M≤N, and 3 / 5Z≤N≤Z.

[0009] In one possible implementation, the first driven part includes a plurality of driven protrusions spaced apart, which are used to drive and cooperate with a plurality of driving protrusions that drive the auxiliary rotating shaft to rotate, and the contact surface between the driven protrusions and the driving protrusions is an inclined surface.

[0010] In one possible implementation, the housing includes a terminal block chamber, a micro switch chamber, and a shaft chamber. The terminal block chamber has an opening at the top for terminal block wiring. The circuit board is positioned between the terminal block chamber and the micro switch chamber. A drive via is provided between the micro switch chamber and the shaft chamber, and the auxiliary shaft drives the micro switch through the drive via.

[0011] In one possible implementation, the auxiliary shaft is connected to a return spring. A first limiting protrusion extends radially on one side of the auxiliary shaft, and a second limiting protrusion is provided on the housing. When the return spring drives the auxiliary shaft to rotate from the second position to the first position, the first limiting protrusion abuts against the second limiting protrusion, so that the auxiliary shaft is held in the first position under the action of the return spring. An external force drives the auxiliary shaft to overcome the elastic force of the return spring, so that the auxiliary shaft rotates from the first position to the second position.

[0012] In one possible implementation, a driving member is provided between the first driving unit and the micro switch. The driving member is slidably arranged along a straight line, and the auxiliary rotating shaft drives the micro switch to switch states through the driving member.

[0013] In one possible implementation, the housing is provided with a protruding retainer, the retainer is provided with a slot, and an annular groove is formed around one side of the auxiliary rotating shaft along the axial direction of the auxiliary rotating shaft. The bottom of the annular groove is a retaining shaft, and the retaining shaft is rotatably engaged in the slot.

[0014] In one possible implementation, the housing includes a left housing and a right housing, which are stacked to cover the limiting terminal assembly, the circuit board, the micro switch, and the auxiliary shaft, such that the auxiliary shaft can only rotate axially.

[0015] Secondly, this application provides a motor protector, including the auxiliary contact structure described in any of the above claims, wherein the auxiliary contact structure is inserted and assembled along the stacking direction of the circuit board, the micro switch and the auxiliary shaft.

[0016] Compared to existing technologies, this application provides an auxiliary contact structure, including a housing, and a circuit board, terminal block assembly, micro switch, and auxiliary shaft disposed within the housing. The terminal block assembly and micro switch are respectively located on both sides of the circuit board. The auxiliary contact structure is internal and does not require a wire, making installation simpler. By arranging them in a stacked manner, the thickness of the auxiliary contact structure is reduced, facilitating the insertion and installation of the auxiliary contact assembly. The rotation of the auxiliary shaft drives the micro switch to switch states via a first driving unit. The longest axial spacing of the auxiliary shaft is greater than the longest radial spacing, ensuring more stable and reliable rotation of the auxiliary shaft. At the same time, the micro switch prevents dust, salt spray, and other contaminants from entering the product during use and affecting the reliability of the contact switching.

[0017] Furthermore, by setting a boss as a first driving part on one side of the auxiliary rotating shaft, and setting an inclined slope or arc surface on the side of the boss facing the micro switch, when the auxiliary rotating shaft rotates, the inclined slope or arc surface of the first driving part can drive the button of the micro switch to move in the vertical direction.

[0018] In addition, the length of the first driven part along the axial direction of the auxiliary rotating shaft is M, the longest distance along the axial direction of the auxiliary rotating shaft is N, 1 / 2N≤M≤N, and the length of the circuit board is Z, 3 / 5Z≤N≤Z. By increasing the length of the first driven part, the driving arm of the auxiliary rotating shaft is increased, and the driving force is reduced.

[0019] Furthermore, the housing includes a terminal block chamber, a micro switch chamber, and a shaft chamber. The terminal block chamber has an opening at its top for terminal block wiring. The circuit board is positioned between the terminal block chamber and the micro switch chamber, improving the seal between them. A drive via is provided between the micro switch chamber and the shaft chamber, allowing the auxiliary shaft to drive the micro switch through this via. By incorporating the terminal block chamber, micro switch chamber, and shaft chamber within the housing, the internal protection level of the housing is further enhanced, providing better dust protection for the micro switch. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the auxiliary contact structure of this utility model;

[0021] Figure 2 This is an exploded view of the auxiliary contact structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the auxiliary contact structure of this utility model with the left housing removed;

[0023] Figure 4 Is Figure 3 A schematic diagram of the structure in which the driving component is set;

[0024] Figure 5This is a schematic diagram of the circuit board and auxiliary shaft.

[0025] The reference numerals in the attached figures include:

[0026] Casing 1;

[0027] Second limiting protrusion 11; Card seat 12; Bayonet 121; Left housing 13; Right housing 14; Terminal block chamber 15; Micro switch chamber 16; Rotary shaft chamber 17; Drive through hole 18;

[0028] Circuit board 2;

[0029] Terminal block assembly 3;

[0030] Micro switch 4;

[0031] Auxiliary shaft 5;

[0032] First driving part 51; first driven part 52; first limiting protrusion 53; locking shaft 54;

[0033] Return spring 6;

[0034] Drive component 7. Detailed Implementation

[0035] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0036] like Figures 1-5 As shown, this application provides an auxiliary contact structure, including a housing 1, and a circuit board 2, a terminal assembly 3, a micro switch 4, and an auxiliary rotating shaft 5 disposed within the housing 1. The terminal assembly 3 and the micro switch 4 are electrically connected to the circuit board 2. The terminal assembly 3 is used to connect to an external wire to transmit electrical signals. The auxiliary rotating shaft 5 is provided with a first driving part 51 for cooperating with the micro switch 4 and a first driven part 52 for driving the auxiliary rotating shaft 5 to rotate. The first driving part 51 and the first driven part 52 are disposed on the side of the axial direction of the auxiliary rotating shaft 5. The rotation of the auxiliary rotating shaft 5 directly or indirectly drives the micro switch 4 to switch states through the first driving part 51, that is, drives the micro switch 4 to switch between closing and opening. The first driven part 52 is used to drive the auxiliary rotating shaft 5 to rotate. The longest axial distance of the auxiliary rotating shaft 5 is greater than the longest radial distance. The longer axial length of the auxiliary rotating shaft 5 can ensure that the rotation of the auxiliary rotating shaft 5 is more stable and reliable. The auxiliary contact structure does not have a flexible wire inside, and the installation is simpler. Meanwhile, by setting a micro switch 4 with a higher protection level, the micro switch 4 cooperates with the auxiliary rotating shaft 5. The rotation of the auxiliary rotating shaft 5 drives the micro switch 4 to close or open, which can prevent dust, salt spray and other pollutants from entering the product during product use and affecting the reliability of the contact.

[0037] The auxiliary contact structure provided in this application is used to be installed in a motor protector. The auxiliary contact structure is inserted and assembled along the stacking direction of the circuit board 2, the micro switch 4 and the auxiliary shaft 5. The auxiliary shaft of the auxiliary contact structure is directly or indirectly driven to cooperate with the shaft in the motor protector.

[0038] Preferred, such as Figure 2 and Figure 3 As shown, the terminal block assembly 3 and the micro switch 4 are respectively located on both sides of the circuit board 2. The terminal block assembly 3 is located on the top surface of the circuit board 2, and the micro switch 4 assembly is located on the bottom surface of the circuit board 2. It is not connected to a flexible wire. The auxiliary rotating shaft 5 is located below the micro switch 4, and the axis of the auxiliary rotating shaft 5 is parallel to the length direction of the circuit board 2. The first driving part 51 is opposite to the micro switch 4. The first driving part 51 drives the micro switch 4 directly or indirectly to switch the state of the micro switch 4. By stacking and arranging, the thickness of the auxiliary contact structure is reduced, which facilitates the insertion and installation of the auxiliary contact assembly.

[0039] Preferred, such as Figure 2 As shown, the auxiliary rotating shaft 5 is an elongated strip structure extending along the axial direction, and the contact surface between the first driving part 51 and the micro switch 4 is an inclined slope or arc surface. In this embodiment, the first driving part 51 includes a protrusion disposed on one axial side of the auxiliary rotating shaft 5, and the top of the protrusion is provided with an inclined slope or arc surface. When the auxiliary rotating shaft 5 is in the first position, the first driving part 51 abuts against the micro switch 4 or there is a gap between the first driving part 51 and the micro switch 4. When the auxiliary rotating shaft 5 rotates from the first position to the second position, the auxiliary rotating shaft 5 presses the micro switch 4 through the first driving part 51, driving the micro switch 4 to switch from the open state to the closed state. When the auxiliary rotating shaft 5 rotates from the second position to the first position, the first driving part 51 of the auxiliary rotating shaft 5 gradually releases the pressure on the micro switch 4, and the micro switch 4 switches from the closed state to the open state.

[0040] By setting a boss as a first driving part 51 on one side of the auxiliary rotating shaft 5, and setting an inclined slope or arc surface on the side of the boss facing the micro switch 4, when the auxiliary rotating shaft 5 rotates, the inclined surface or arc surface of the first driving part 51 can drive the button of the micro switch 4 to move in the vertical direction.

[0041] In one embodiment, such as Figures 1-3 As shown, the first driving unit 51 is directly driven by the micro switch 4. In another embodiment, as... Figure 4As shown, the first driving unit 51 is indirectly driven by the micro switch 4. A linear motion driving member 7 is provided between the first driving unit 51 and the micro switch 4. The linear motion direction of the driving member 7 is consistent with the pressing direction of the button of the micro switch 4. The auxiliary rotating shaft 5 drives the micro switch 4 to switch states by driving the driving member 7 to move in a straight line.

[0042] Preferred, such as Figure 5 As shown, the length of the first driven part 52 along the axial direction of the auxiliary rotating shaft 5 is M, the longest spacing along the axial direction of the auxiliary rotating shaft 5 is N, 1 / 2N≤M≤N, and the length of the circuit board 2 is Z, 3 / 5Z≤N≤Z. The first driven part 52 can be a plate-shaped driven protrusion or it can include multiple block-shaped driven protrusions spaced apart. By increasing the length of the first driven part 52, the driving arm of the auxiliary rotating shaft 5 is increased, making driving easier.

[0043] Preferably, the first driven portion 52 includes a plurality of driven protrusions spaced apart (e.g., ... Figures 1-4 As shown, this embodiment includes two driven protrusions, and the rotating shaft of the motor protector is connected to multiple driving protrusions. The multiple driven protrusions are driven and cooperate with the multiple driving protrusions one by one. The contact surface between the driven protrusion and the driving protrusion is an inclined surface.

[0044] Furthermore, such as Figure 2 and Figure 3 As shown, the auxiliary rotating shaft 5 is connected to a return spring 6. A first limiting protrusion 53 extends radially from one side of the auxiliary rotating shaft 5, and a second limiting protrusion 11 is provided on the housing 1. When the return spring 6 drives the auxiliary rotating shaft 5 to rotate from the second position to the first position, the first limiting protrusion 53 abuts against the second limiting protrusion 11, keeping the auxiliary rotating shaft 5 in the first position under the action of the return spring 6. An external force drives the auxiliary rotating shaft 5 to overcome the elastic force of the return spring 6, causing the auxiliary rotating shaft 5 to rotate from the first position to the second position. Further, the return spring 6 can be a torsion spring, tension spring, compression spring, or spring, etc. In a preferred embodiment of this application, the return spring 6 is a torsion spring, sleeved on one end of the auxiliary rotating shaft 5. The two driving arms of the torsion spring abut against the housing 1 and the auxiliary rotating shaft 5 respectively, driving the auxiliary rotating shaft 5 to return to its original position.

[0045] Preferred, such as Figure 2 and Figure 3 As shown, the housing 1 is provided with a protruding retaining seat 12, and the auxiliary rotating shaft 5 is rotatably mounted on the retaining seat 12. The retaining seat 12 is provided with a retaining slot 121, and an annular groove is formed axially around one side of the auxiliary rotating shaft 5. The bottom of the annular groove is a retaining shaft 54, which is rotatably engaged in the retaining slot 121.

[0046] Preferred, such as Figure 1As shown, the housing 1 has a first notch on one side of the auxiliary rotating shaft 5, and the first driven part 52 extends out from the first notch for driving cooperation with the drive protrusion of the motor protector.

[0047] Preferred, such as Figure 2 As shown, the housing 1 includes a left housing 13 and a right housing 14. The left housing 13 and the right housing 14 are stacked and cover the limiting terminal assembly 3, the circuit board 2, the micro switch 4, and the auxiliary rotating shaft 5, so that the auxiliary rotating shaft 5 can only rotate axially. Furthermore, the left housing 13 and the right housing 14 are snap-fitted together.

[0048] Preferably, the housing 1 includes a terminal block chamber 15, a micro switch chamber 16, and a shaft chamber 17. The terminal block chamber 15 has an opening at its top for terminal block wiring. The circuit board 2 is positioned between the terminal block chamber 15 and the micro switch chamber 16, improving the sealing between them. A drive through-hole 18 is provided between the micro switch chamber 16 and the shaft chamber 17, allowing the auxiliary shaft 5 to drive the micro switch 4 through the drive through-hole 18. By providing the terminal block chamber 15, the micro switch chamber 16, and the shaft chamber 17 within the housing 1, the protection level inside the housing 1 can be further improved, providing better dustproof protection for the micro switch 4.

[0049] It should be noted that the auxiliary contact structure of this application can also be applied to other switching devices such as circuit breakers.

[0050] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0051] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. An auxiliary contact structure, comprising a housing (1), and a circuit board (2), a terminal assembly (3), a micro switch (4), and an auxiliary rotating shaft (5) disposed within the housing (1), wherein the terminal assembly (3) and the micro switch (4) are electrically connected to the circuit board (2), and the axial side of the auxiliary rotating shaft (5) is provided with a first driving part (51) that drives the micro switch (4) to rotate and a first driven part (52) for driving the auxiliary rotating shaft (5) to rotate, wherein the rotation of the auxiliary rotating shaft (5) drives the micro switch to switch states via the first driving part, characterized in that, The longest axial spacing of the auxiliary rotating shaft (5) is greater than the longest radial spacing. The terminal assembly (3) and the micro switch (4) are respectively located on both sides of the circuit board (2), and the axial direction of the auxiliary rotating shaft (5) is parallel to the length direction of the circuit board (2). The first driving part (51) is opposite to the micro switch (4).

2. The auxiliary contact structure according to claim 1, characterized in that, The auxiliary rotating shaft (5) is a long strip structure extending along the axial direction, and the contact surface between the first driving part (51) and the micro switch (4) is an inclined slope or arc surface.

3. The auxiliary contact structure according to claim 1, characterized in that, The length of the first driven part (52) along the axial direction of the auxiliary rotating shaft (5) is M, the longest distance along the axial direction of the auxiliary rotating shaft (5) is N, the length of the circuit board (2) is Z, 0.5N≤M≤N, 3 / 5Z≤N≤Z.

4. The auxiliary contact structure according to claim 1, characterized in that, The first driven part (52) includes a plurality of driven protrusions spaced apart. The plurality of driven protrusions are used to drive and cooperate with a plurality of driving protrusions that drive the auxiliary rotating shaft (5) to rotate. The contact surface between the driven protrusion and the driving protrusion is an inclined surface.

5. The auxiliary contact structure according to claim 1, characterized in that, The housing (1) includes a terminal block chamber (15), a micro switch chamber (16), and a shaft chamber (17). The terminal block chamber (15) has an opening at the top for terminal block wiring. The circuit board (2) is located between the terminal block chamber (15) and the micro switch chamber (16). A drive through hole (18) is provided between the micro switch chamber (16) and the shaft chamber (17). The auxiliary shaft (5) drives the micro switch (4) through the drive through hole (18).

6. The auxiliary contact structure according to claim 1, characterized in that, The auxiliary rotating shaft (5) is connected to the return spring (6). The auxiliary rotating shaft (5) has a first limiting protrusion (53) extending radially on one side. The housing (1) has a second limiting protrusion (11). When the return spring (6) drives the auxiliary rotating shaft (5) to rotate from the second position to the first position, the first limiting protrusion (53) abuts against the second limiting protrusion (11), so that the auxiliary rotating shaft (5) is held in the first position under the action of the return spring (6). The external force drives the auxiliary rotating shaft (5) to overcome the elastic force of the return spring (6) and rotate the auxiliary rotating shaft (5) from the first position to the second position.

7. The auxiliary contact structure according to claim 1, characterized in that, A driving member (7) is provided between the first driving unit (51) and the micro switch (4). The driving member (7) is slidably arranged along a straight line. The auxiliary rotating shaft (5) drives the micro switch (4) to switch states through the driving member (7).

8. The auxiliary contact structure according to claim 1, characterized in that, The housing (1) is provided with a protruding card seat (12), the card seat (12) is provided with a slot (121), and an annular groove is opened on one side of the auxiliary rotating shaft (5) around the axial direction of the auxiliary rotating shaft (5). The bottom of the annular groove is a card shaft (54), and the card shaft (54) is rotatably engaged in the slot (121).

9. The auxiliary contact structure according to claim 1, characterized in that, The housing (1) includes a left housing (13) and a right housing (14). The left housing (13) and the right housing (14) are stacked and cover the limit terminal assembly (3), the circuit board (2), the micro switch (4) and the auxiliary rotating shaft (5), so that the auxiliary rotating shaft (5) can only rotate along the axial direction.

10. A motor protector, characterized in that, Includes the auxiliary contact structure according to any one of claims 1-9, wherein the auxiliary contact structure is inserted and assembled along the stacking direction of the circuit board (2), the micro switch (4) and the auxiliary rotating shaft (5).

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