Circuit breaker contact structure

Abstract

The utility model discloses a circuit breaker contact structure, which comprises a rotating shaft and a moving contact, the rotating shaft is movably arranged in a circuit breaker, a contact cavity is arranged on the rotating shaft in a penetrating manner, two ends of the contact cavity are opened, and the moving contact is arranged in the contact cavity in a penetrating manner; the device further comprises a tensioning structure, and the tensioning structure comprises a tension spring. According to the utility model, a movable contact structure composed of the rotating shaft and the movable contact is adopted, when the contact switch drives the movable contact to contact with the static contact, the movable range of the movable contact can effectively prevent the movable contact and the static contact from generating overlarge acting force, and meanwhile, the movable contact is tensioned through the tensioning structure in the rotating shaft, so that the contact switch is more stable. Furthermore, the contact switch can be designed to drive the rotating shaft to move beyond a set position, and reliable contact connection is formed between the moving contact and the static contact by virtue of the force of the tensioning structure, so that the condition of poor contact possibly caused by part errors and installation errors is eliminated.

Description

Technical Field

[0001] The utility model belongs to the technical field of circuit breakers and relates to a contact structure of a circuit breaker. Background Art

[0002] The contact module is an important part of the circuit breaker. The contact module usually includes a moving contact, a stationary contact, and a contact switch. The contact switch drives the moving contact and the stationary contact to come into contact and to leave.

[0003] In existing circuit breaker products, when the contact switch closes and causes the moving contact to abut against the static contact, it is difficult to control the moving contact to accurately move to the set position every time due to the inevitable existence of certain component errors and installation errors in the equipment. Therefore, when the set position is not reached, the contact between the moving and static contacts is unreliable, and when the set position is exceeded, the interaction force between the moving and static contacts is too large or deformation and damage of the components are caused. The safety of use and the service life of the circuit breaker products cannot be guaranteed. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the utility model provides a circuit breaker contact structure.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A circuit breaker contact structure comprises a rotating shaft and a moving contact, wherein the rotating shaft is movably arranged in the circuit breaker, a contact cavity is provided through the rotating shaft, the contact cavity forms openings at both ends, and the moving contact is passed through the contact cavity; further comprising a tensioning structure, wherein the tensioning structure comprises a tension spring, wherein both ends of the tension spring are respectively connected to the moving contact and one of the openings of the contact cavity, and the number of the tensioning structures is two, and they are symmetrically arranged in the contact cavity with respect to the center.

[0007] Furthermore, the moving contact includes a middle portion and abutment portions respectively connected to two ends of the middle portion, and the two abutment portions are centrally symmetrical with the middle portion as the center.

[0008] Furthermore, the tensioning structure also includes a first shaft and a second shaft, the first shaft and the second shaft are respectively connected to two ends of the tension spring, the first shaft is connected to one end of the middle part, and the second shaft is connected to one opening of the contact cavity.

[0009] Furthermore, a shoulder step is provided between the abutting portion and the middle portion, and the first shaft is arranged in the shoulder step.

[0010] Furthermore, a groove is provided at the opening of the contact cavity, and two ends of the second shaft are arranged in the groove.

[0011] Furthermore, the contact cavity is arranged to penetrate along the radial direction of the rotating shaft.

[0012] Furthermore, an oblique groove for the abutment portion to enter is provided at the opening of the contact cavity.

[0013] In summary, the utility model is beneficial in that:

[0014] The utility model adopts a movable contact structure composed of a rotating shaft and a moving contact. When the contact switch drives the moving contact to contact the static contact, the movable range of the moving contact can effectively avoid excessive force between the moving contact and the static contact. At the same time, the moving contact is tightened by the tensioning structure in the rotating shaft, and then the contact switch can be designed to drive the movement of the rotating shaft beyond the set position. The moving contact and the static contact are connected in a reliable contact by relying on the force of the tensioning structure, thereby eliminating the poor contact that may be caused by parts errors and installation errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the contact structure of the utility model.

[0016] Figure 2 for Figure 1 Schematic diagram of the structure of the moving contact part.

[0017] Figure 3 for Figure 1 Schematic diagram of the structure of the transfer shaft part.

[0018] Figure 4 FIG. 4 is a schematic diagram of a contact structure having a shoulder step in some embodiments.

[0019] Markings in the figure: 1, rotating shaft; 11, contact cavity; 12, inclined groove; 13, groove; 21, middle part; 22, abutment part; 23, shoulder step; 31, first shaft; 32, second shaft; 33, tension spring. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0022] All directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical...) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0023] Due to installation errors and other reasons, the parallel relationship referred to in the embodiments of the present invention may actually be an approximately parallel relationship, and the vertical relationship may actually be an approximately vertical relationship.

[0024] The utility model provides a circuit breaker contact structure, which can be arranged in a contact module of a common circuit breaker device and is used for maintaining a stable position of a moving contact to ensure that the moving contact forms a solid contact with a static contact in a closed state.

[0025] Specifically, refer to Figure 1 The contact structure includes a rotating shaft 1, which is arranged in a cavity inside the contact module. The rotating shaft 1 is approximately a cylindrical structure, and its two axial ends are connected to the contact module so that the rotating shaft 1 can rotate with its own axis as the rotation center. When the contact switch in the circuit breaker is closed / opened, the rotating shaft 1 is synchronously driven to rotate to drive the moving contact and the static contact to contact / separate.

[0026] Reference Figure 2 The moving contact includes a middle portion 21, and both ends of the middle portion 21 are respectively provided with abutment portions 22 for contacting with the static contact, and in this embodiment, the two abutment portions 22 are centrally symmetrically arranged with the middle portion 21 as the center.

[0027] Reference Figure 3 A contact cavity 11 is provided in the rotating shaft 1. The contact cavity 11 is provided along the radial direction of the rotating shaft 1 and includes two openings connected to the peripheral wall of the rotating shaft 1. The moving contact is provided in the contact cavity 11, and the abutting portions 22 at both ends of the moving contact respectively pass through the two openings.

[0028] During the closing action of the contact switch, the rotating shaft 1 is rotated to the set position so that the moving contact abuts against the static contact. Due to certain component errors and installation errors in the equipment, it is difficult to control the rotating shaft 1 to rotate to the set position every time. When the set position is not reached, the contact between the moving and static contacts is unreliable. When the set position is exceeded, the interaction force between the moving and static contacts is too large or causes deformation and damage to the components.

[0029] Therefore, the moving contact in this embodiment is movably connected within the rotating shaft 1, and each time the contact switch is closed, the rotation position of the rotating shaft 1 is set to exceed the above-mentioned set position, so that the movable margin of the moving contact can ensure that the moving and static contacts are in actual contact without generating excessive interaction force.

[0030] In one embodiment, a pin shaft is passed through the middle of the middle part 21, so that the moving contact can rotate within the range of the contact cavity 11 with the pin shaft as the center. Furthermore, a torsion spring is sleeved on the pin shaft, and the two ends of the torsion spring are respectively connected to the moving contact and the rotating shaft 1, providing the moving contact with a torque toward the static contact, thereby ensuring the contact effect between the moving and static contacts.

[0031] In another preferred embodiment, two groups of elastic tensioning structures are provided on the moving contact, and the two groups of elastic tensioning structures are respectively symmetrically arranged with the middle part 21 as the center, and the elastic tensioning structure includes a first shaft 31, a second shaft 32 and a tension spring 33. The first shaft 31 is passed through one end of the middle part 21 and is close to one side opening of the contact cavity 11. The second shaft 32 is fixedly arranged at the other side opening of the contact cavity 11 relative to the first shaft 31. The two ends of the tension spring 33 are respectively connected to the first shaft 31 and the second shaft 32. Through the arrangement of the two groups of elastic tensioning structures, the two ends of the middle part 21 are respectively tightened by the two parts of the tension spring 33, so that the abutting parts 22 on both sides are respectively abutted against the openings of the corresponding contact cavity 11, and the elastic force of the tension spring 33 provides a pulling force toward the static contact to the moving contact, thereby ensuring the contact effect of the moving and static contacts.

[0032] The side of the opening of the contact cavity 11 is provided with an inclined groove 12 for the abutment portion 22 to partially enter. The abutment portion 22 is kept in the inclined groove 12 under the action of the tension spring 33. The two side walls of the inclined groove 12 abut against the two sides of the abutment portion 22 to form a limit, which limits the position of the moving contact, avoids the moving contact from being offset and misaligned, and ensures full contact between the moving contact and the static contact.

[0033] For ease of installation, a groove 13 is provided at the opening of the contact cavity 11 , both ends of the second shaft 32 fall into the groove 13 and are kept in the groove 13 by the action of the tension spring 33 . During installation, the second shaft 32 only needs to be placed in the groove 13 .

[0034] Further, in some embodiments, referring to Figure 4 A shoulder step 23 is provided between the corresponding ends of the abutting portion 22 and the middle portion 21, specifically, an inwardly concave angle formed between the abutting portion 22 and the middle portion 21. The first shaft 31 can be placed in the shoulder step 23, and the relative position of the first shaft 31 and the moving contact is maintained by the tension spring 33, which also provides tension to the moving contact.

[0035] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. A circuit breaker contact structure, characterized in that: The invention comprises a rotating shaft (1) and a moving contact, wherein the rotating shaft (1) is movably arranged in a circuit breaker, a contact cavity (11) is provided through the rotating shaft (1), the contact cavity (11) forms openings at both ends, and the moving contact is inserted into the contact cavity (11); and further comprises a tensioning structure, wherein the tensioning structure comprises a tension spring (33), the two ends of the tension spring (33) are respectively connected to the moving contact and one of the openings of the contact cavity (11), and the number of the tensioning structures is two, and they are centrally symmetrically arranged in the contact cavity (11).

2. A circuit breaker contact structure according to claim 1, characterized in that: The moving contact comprises a middle portion (21) and abutment portions (22) respectively connected to two ends of the middle portion (21), and the two abutment portions (22) are centrally symmetrical with the middle portion (21) as the center.

3. A circuit breaker contact structure according to claim 2, characterized in that: The tensioning structure further comprises a first shaft (31) and a second shaft (32), wherein the first shaft (31) and the second shaft (32) are respectively connected to two ends of the tension spring (33), the first shaft (31) is connected to one end of the middle portion (21), and the second shaft (32) is connected to one opening of the contact cavity (11).

4. A circuit breaker contact structure according to claim 3, characterized in that: A shoulder step (23) is provided between the abutting portion (22) and the middle portion (21), and the first shaft (31) is arranged in the shoulder step (23).

5. A circuit breaker contact structure according to claim 3 or 4, characterized in that: A groove (13) is provided at the opening of the contact cavity (11), and two ends of the second shaft (32) are arranged in the groove (13).

6. A circuit breaker contact structure according to claim 2, characterized in that: The contact chamber (11) is arranged to penetrate along the radial direction of the rotating shaft (1).

7. A circuit breaker contact structure according to claim 2, characterized in that: An inclined groove (12) for the abutment portion (22) to enter is also provided at the opening of the contact cavity (11).

Images