A thermal magnetic adjustable structure and control and protection switch electrical appliance

Abstract

The present invention provides a thermal magnetic adjustable structure and a control and protection switch electrical appliance, which belong to the technical field of low-voltage electrical appliances. The thermal magnetic adjustable structure includes: a bimetallic strip; a transmission structure; a rocker arm, which is rotatably arranged on a bracket; the rocker arm cooperates with the transmission structure to transmit a tripping signal to a control protector; an adjustment component, which is arranged on the bracket; the adjustment component is connected to the rocker arm and drives the rocker arm to move and change the position of the rocker arm and the transmission structure; the thermal magnetic adjustable structure of the present invention can compensate for different displacement values caused by various comprehensive factors to the product at any time, fundamentally optimize the characteristic parameters of the calibration of the thermal magnetic module, greatly improve the efficiency of the calibration, improve the production efficiency of the product, and reduce the production cost.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to a thermomagnetic adjustable structure and a control and protection switch electrical appliance. Background Art

[0002] The thermal magnetic module is an important component of the control and protection switch electrical appliance. Its working principle is: when the actual three-phase operating current of the main circuit load exceeds 1.05 times the set value, the slender bimetallic element contained in its conductor expands and bends due to heat, and the non-fixed end undergoes a certain amount of displacement. The driving force generated by this displacement drives the transmission mechanism to perform a series of actions, thereby causing the control and protection switch electrical appliance to trip, cutting off the main power supply, and achieving reliable protection for the load.

[0003] In actual production, due to the errors in the processing dimensions of various interrelated parts, the deviation in the actual current of the main circuit and the deviation in the resistance value of the heating element, under the influence of these comprehensive factors, the pre-set displacement is different from the actual required displacement and needs to be reworked and recalibrated.

[0004] During the calibration process of the thermomagnetic module, the bimetallic strip first needs to be gradually cooled to room temperature, the displacement value needs to be reset, and the calibration process needs to be re-performed. This calibration process takes about 12 hours, and sometimes 3-4 calibrations are required. This method greatly reduces production efficiency and increases production costs. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that during the calibration process of the thermomagnetic module, the bimetallic strip needs to be gradually cooled to room temperature, the displacement value needs to be reset, and the recalibration process needs to be performed. The calibration process takes about 12 hours, and sometimes, 3-4 calibrations are required. This method greatly reduces production efficiency and increases production costs, thereby providing a thermomagnetic adjustable structure.

[0006] The invention also provides a control and protection switch electrical appliance.

[0007] In order to solve the above technical problems, the present invention provides a thermomagnetic adjustable structure, comprising:

[0008] One end of the bimetallic strip is connected in series with the three-phase power supply circuit, and the other end deforms and displaces due to temperature changes;

[0009] A transmission structure connected to the bimetallic strip and moving under the drive of the deformation displacement of the bimetallic strip;

[0010] A rocker arm is rotatably mounted on the bracket; the rocker arm cooperates with the transmission structure to transmit a tripping signal to the control protector;

[0011] An adjusting component is arranged on the bracket; the adjusting component is connected to the rocker arm and drives the rocker arm to move to change the position of the rocker arm and the transmission structure.

[0012] As a preferred solution, the transmission structure includes:

[0013] The guide plate is formed with a guide hole; one end of the bimetallic strip is inserted into the guide hole.

[0014] As a preferred solution, one end of the rocker arm is a receiving part connected to the guide plate and drives the rocker arm to rotate under the push of the guide plate, the other end is an output part that cooperates with the control protector, and the middle part is a connecting part that is rotatably connected to the bracket through a rotating shaft.

[0015] As a preferred solution, it further includes: an elastic member, which is arranged on the bracket; the elastic member has a driving force to drive the rocker arm to rotate and reset.

[0016] As a preferred solution, the adjustment component includes:

[0017] A first supporting member, one end of which is fixedly connected to the connecting portion of the rocker arm and the other end of which is rotatably sleeved on the rotating shaft;

[0018] A second supporting member, one end of which is rotatably sleeved on the rotating shaft and the other end of which has an extended abutment end for abutting the cam; the second supporting member also has an abutment surface arranged toward the first supporting member;

[0019] The adjusting member is arranged between the first supporting member and the second supporting member; the adjusting member drives the first supporting member to move circumferentially around the rotating shaft.

[0020] As a preferred solution, the adjusting member is an adjusting screw; the first supporting member has a threaded hole; the adjusting screw is threadedly connected to the threaded hole of the first supporting member, and the end portion abuts against the abutment surface of the second supporting member.

[0021] As a preferred solution, the elastic member is a torsion spring, which is sleeved on the rotating shaft, with one end abutting against the first supporting member and the other end abutting against the cam.

[0022] As a preferred solution, the transmission structure further includes:

[0023] A push plate is arranged at a position where the guide plate cooperates with the receiving portion of the rocker arm.

[0024] The present invention also provides a control and protection switch electrical appliance, comprising any of the above-mentioned thermomagnetic adjustable structures.

[0025] The technical solution of the present invention has the following advantages:

[0026] 1. The adjustable thermal-magnetic structure provided by the present invention includes a bimetallic strip, a transmission structure, a rocker arm, and an adjustment assembly. If any item in the verification module of the thermal-magnetic module fails, there is no need to adjust the bimetallic strip, that is, there is no need to return the thermal-magnetic module to its initial state (nor to cool it to room temperature). The adjustment assembly can directly drive the rocker arm to move to the appropriate position, thereby successfully achieving a tripping action.

[0027] The adjustment component can compensate for the different displacement values of the product caused by various comprehensive factors at any time, fundamentally optimizing the calibration characteristic parameters of the thermal magnetic module, greatly improving the efficiency of calibration, improving the production efficiency of the product, and reducing production costs.

[0028] 2. The thermomagnetic adjustable structure provided by the present invention comprises an adjustment component including a first support member, a second support member and an adjustment member; the adjustment member is an adjustment screw; during the adjustment process, it is only necessary to adjust the adjustment screw so that the first support member and the second support member move in a separate or close trajectory, thereby driving the rocker arm to move and completing the calibration.

[0029] 3. The control and protection switch electrical appliance provided by the present invention includes the above-mentioned thermomagnetic adjustable structure, and thus has any of the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a structural schematic diagram of the thermomagnetic adjustable structure of the present invention.

[0032] Figure 2 for Figure 1 The first angle stereoscopic structural diagram of the adjustment component is shown.

[0033] Figure 3 It is a top view of the local structure of the thermomagnetic adjustable structure of the present invention.

[0034] Figure 4 for Figure 1 The second angle stereoscopic structural diagram of the adjustment component is shown.

[0035] Figure 5 It is a structural schematic diagram of the relationship between the abutting end of the second supporting member and the cam of the present invention.

[0036] Description of reference numerals:

[0037] 1. Bimetallic strip; 2. Guide plate; 3. Push plate; 4. Rocker arm; 5. First support member; 6. Second support member; 7. Adjusting screw; 8. Rotating shaft; 9. Bracket; 10. Cam; 11. Abutment end; 12. Fixed screw; 13. Receiving part; 14. Output part; 15. Connecting part. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] Example 1

[0043] The thermomagnetic adjustable structure provided in this embodiment includes: a bimetallic strip 1, a guide plate 2, a rocker arm 4 and an adjustment component. When any item of the verification module of the thermomagnetic module fails, there is no need to adjust the bimetallic strip 1, that is, there is no need to return the thermomagnetic module to its initial state (nor to cool it to room temperature). By setting the adjustment component, the rocker arm 4 can be directly driven to move and adjusted to a suitable position, so that the tripping action can be successfully achieved. The adjustment component can compensate for different displacement values caused by various comprehensive factors on the product at any time, fundamentally optimizing the characteristic parameters of the thermomagnetic module verification, greatly improving the efficiency of verification, improving the production efficiency of the product, and reducing production costs.

[0044] like Figure 1 As shown, one end of the bimetallic strip 1 is a fixed end connected in series with the three-phase power supply line, and the other end is a free end inserted into the guide hole of the guide plate 2. The guide hole is formed on the guide plate 2. The bimetallic strip 1 is made of two metals with different expansion coefficients that are tightly bonded together through a special process. When the overload current in the circuit is a certain multiple of the rated current, the bimetallic strip 1 will heat up, expand, and bend, causing the free end to deform and displace by a certain amount. This deformation and displacement generates a driving force, which pushes the guide plate 2 to perform a series of actions.

[0045] The other end of the guide plate 2 is provided with a push plate 3, one end of which is connected to a rocker arm 4; the rocker arm 4 is rotatably provided on a bracket 9;

[0046] like Figure 2 As shown, the rocker arm 4 is arranged in an arc shape and has a receiving portion 13, an output portion 14 and a connecting portion 15; the receiving portion 13 is connected to the push plate 3, and drives the rocker arm 4 to rotate under the drive of the push plate 3, the output portion 14 cooperates with the control protector, and the connecting portion 15 is fixedly connected to one end of the first support member 5 through the fixing screw 12; the other end of the first support member 5 is sleeved on the rotating shaft 8 and is rotatably connected to the rotating shaft 8;

[0047] like Figure 3 As shown, a torsion spring (not shown in the figure) is also provided on the rotating shaft 8, and one end of the torsion spring abuts against the first support member 5; when the push plate 3 pushes the rocker arm 4 to the right (as shown in the direction of the arrow in the figure), the rocker arm 4 is connected to the first support member 5, so that the first support member 5 and the rocker arm 4 rotate counterclockwise (as shown in the direction of the curved arrow in the figure), thereby causing the control protector to trip, cutting off the main circuit, and achieving reliable protection for the load; when returning to normal, the driving force of the torsion spring drives the first support member 5 to rotate, thereby driving the rocker arm 4 to rotate, and realizing the resetting of the rocker arm 4.

[0048] like Figure 4As shown, the rotating shaft 8 is further sleeved with a second support member 6, which has an abutting end 11 extending toward the cam 10 and abutting the cam 10, and also has an abutting surface arranged toward the first support member 5; a threaded hole is provided on the first support member 5, and an adjusting screw 7 is threadedly connected in the threaded hole, and the end of the adjusting screw 7 abuts against the abutting surface of the second support member 6;

[0049] like Figure 5 As shown, when the adjusting screw 7 is screwed toward the second supporting member 6, the end of the adjusting screw 7 abuts against the abutting surface of the second supporting member 6. Therefore, the first supporting member 5 moves counterclockwise with the rotating shaft 8 as the center. That is, the distance between the first supporting member 5 and the end of the second supporting member 6 away from the rotating shaft 8 becomes larger. When the first supporting member 5 moves, the position of the rocker arm 4 is also driven to move.

[0050] When the adjusting screw 7 is turned in the direction away from the second supporting member, since the torsion spring has a driving force to drive the first supporting member 5 clockwise around the rotating shaft 8, the first supporting member 5 will move clockwise around the rotating shaft 8, that is, the distance between the first supporting member 5 and the end of the second supporting member 6 away from the rotating shaft 8 will become smaller, and the movement of the first supporting member 5 will also drive the movement of the position of the rocker arm 4;

[0051] The movement of the above-mentioned adjusting screw 7 is used to realize the movement of the position of the rocker arm 4. When, under comprehensive factors, the deformation displacement of the bimetallic piece cannot accurately drive the rocker arm 4 to drive the control protector to trip, the adjusting screw 7 is adjusted to move the rocker arm 4. Under the condition of the deformation displacement, the rocker arm 4 can directly drive the control protector to trip smoothly.

[0052] Usage and principle

[0053] The working principle of the overload protection feature of the thermal magnetic module is that when the actual three-phase operating current of the main circuit load exceeds 1.05 times the set value, the bimetallic element expands and bends due to heat, and the free end undergoes a certain amount of deformation displacement. The driving force generated by this deformation displacement pushes the guide plate 2, push plate 3, rocker arm 4 and other parts to perform a series of actions, thereby causing the control protector to trip, cutting off the main circuit and achieving reliable protection for the load;

[0054] When in use, first conduct cold synchronization debugging, and adjust the bimetallic strip 1 and other parts so that the bimetallic piece can reliably simulate the tripping of the transmission structure at the same stroke distance (the stroke distance is simulated by a special fixture). Then the power-on debugging stage can be entered, and the main circuit is passed with the specified current value. The qualification of each relevant item is judged according to the requirements of GB / T14048.9. When any item specified in the process is unqualified, the batch of thermal magnetic modules needs further adjustment; at this time, adjust the adjustment screw 7 so that the first support member 5 and the second support member 6 move in a separate or close trajectory. This method does not require returning the thermal magnetic module to its initial state, and can be adjusted directly, which fundamentally optimizes the characteristic parameters of the thermal magnetic module and greatly improves the production efficiency of the calibration.

[0055] Example 2

[0056] The control and protection switch electrical appliance provided in this embodiment includes the thermal magnetic adjustable structure described in Example 1; the control and protection switch electrical appliance can be an electrical appliance such as a circuit breaker.

[0057] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A thermomagnetic adjustable structure, characterized in that: include: A bimetallic strip (1) is connected in series with a three-phase power supply circuit at one end and deforms and displaces at the other end due to temperature changes; A transmission structure connected to the bimetallic strip (1) and moving under the drive of the deformation displacement of the bimetallic strip (1); A rocker arm (4) is rotatably mounted on a bracket (9); the rocker arm (4) cooperates with the transmission structure to transmit a tripping signal to a control protector; An adjusting component is provided on a bracket (9); the adjusting component is connected to the rocker arm (4) and drives the rocker arm (4) to move and change the position of the rocker arm (4) and the transmission structure; the adjusting component comprises: a first support member (5), a second support member (6) and an adjusting member; the first support member (5) is fixedly connected to the connecting portion (15) of the rocker arm (4) at one end, and the other end is rotatably sleeved on the rotating shaft (8); the second support member (6) is rotatably sleeved on the rotating shaft (8), and the other end has an extended abutting end (11) for abutting with the cam (10); the second support member (6) also has an abutting surface arranged toward the first support member (5); the adjusting member is arranged between the first support member (5) and the second support member (6); the adjusting member drives the first support member (5) to move circumferentially with the rotating shaft (8) as the center.

2. The thermomagnetic adjustable structure according to claim 1, characterized in that: The transmission structure includes: The guide plate (2) is formed with a guide hole; one end of the bimetallic strip (1) is inserted into the guide hole.

3. The thermomagnetic adjustable structure according to claim 2, characterized in that: One end of the rocker arm (4) is a receiving portion (13) connected to the guide plate (2) and driving the rocker arm (4) to rotate under the push of the guide plate (2); the other end is an output portion (14) cooperating with the control protector; and the middle portion is a connecting portion (15) rotatably connected to the bracket (9) through a rotating shaft (8).

4. The thermomagnetic adjustable structure according to claim 3, characterized in that: Also includes: An elastic member is arranged on a bracket (9); the elastic member has a driving force for driving the rocker arm (4) to rotate and reset.

5. The thermomagnetic adjustable structure according to claim 4, characterized in that: The adjusting member is an adjusting screw (7); the first supporting member (5) has a threaded hole; the adjusting screw (7) is threadedly connected to the threaded hole of the first supporting member (5), and the end portion abuts against the abutting surface of the second supporting member (6).

6. The thermomagnetic adjustable structure according to claim 5, characterized in that: The elastic member is a torsion spring, which is sleeved on the rotating shaft (8), with one end abutting against the first supporting member (5) and the other end abutting against the cam (10).

7. The thermomagnetic adjustable structure according to claim 2, characterized in that: The transmission structure further includes: A push plate (3) is arranged at a position where the guide plate (2) cooperates with the receiving portion (13) of the rocker arm (4).

8. A control and protection switch electrical appliance, characterized in that: The invention comprises the thermomagnetic adjustable structure according to any one of claims 1 to 7.

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