CN216213135U - Rotating structure of thermal overcurrent relay - Google Patents

Abstract

The utility model relates to a rotary structure of a thermal power over-current relay, which comprises a shell, wherein a plurality of double alloy plates, a moving plate, an actuating connecting rod, a compensation double alloy plate, a movable contact terminal, a normally closed fixed contact element, a normally closed movable contact element, a normally open fixed contact element and a normally open movable contact element are arranged in the shell, the rotary structure comprises a rotary member, the rotary member is rotatably arranged in the shell and is provided with a first rotary arm, a second rotary arm and a third rotary arm which are distributed around a rotary center, the movable contact terminal drives the rotary member to rotate when being electrified, the normally closed movable contact element and the normally closed fixed contact element are changed from closed to open through the first rotary arm, the normally open movable contact element and the normally open fixed contact element are changed from open to closed through the second rotary arm, and the third rotary arm is used as a trip display rod, for indicating the operating state of the thermal overcurrent relay.

Description

Rotating structure of thermal overcurrent relay

Technical Field

The utility model relates to the field of thermal overcurrent relays, in particular to a rotating structure of a thermal overcurrent relay.

Background

Fig. 1 is a front view of a conventional thermal overcurrent relay. The conventional thermal current relay includes a housing 40, and a double alloy plate 41, a linkage plate 42, an actuating link 43, a compensation double alloy plate 44, a movable contact 45, a first link 46, a second link 47, a normally closed movable contact 51, a normally closed fixed contact 52, a normally open fixed contact 53, and a normally open movable contact 54 are mounted in the housing 40. When the thermal current relay is energized, the double alloy plate 41 is heated and bent at this time, and the interlocking plate 42 is driven to push the compensation double alloy plate 44 on the actuating link 43, and when the double alloy plate 41 is heated to reach a certain bending amount and overcome the tripping load, the mechanism will trip at this time, so that the movable contact 45 generates deflection, and drive the first link 46 and the second link 47 to actuate, so that the normally closed movable contact 51 and the normally closed fixed contact 52 become open from closed, and the normally open fixed contact 53 and the normally open movable contact 54 become closed from open.

However, the above thermal overcurrent relay has too many components of the whole mechanism, and the mechanical operation may not be smooth due to the problems of too large combination margin, dimension difference of each component, too much mechanism linkage and the like after the assembly is completed, and the conventional function of the thermal overcurrent relay may be affected by the erroneous operation during the switching operation between the normally open state and the normally closed state, and the quality of the thermal overcurrent relay is poor.

Disclosure of Invention

The present invention is directed to a rotary structure of a thermal overcurrent relay to solve the above problems. Therefore, the utility model adopts the following specific technical scheme:

a rotary structure of a thermal power over-current relay comprises a shell, wherein a plurality of double alloy plates are arranged in the shell, a moving plate is arranged below the double alloy plates, an actuating connecting rod is arranged at one side in the shell, a compensation double alloy plate and a movable contact terminal are arranged on the actuating connecting rod, the lower end of the compensation double alloy plate is connected with the moving plate, a normally closed fixed contact element, a normally closed movable contact element, a normally open fixed contact element and a normally open movable contact element are further arranged in the shell, the rotary structure comprises a rotary member, the rotary member is rotatably arranged in the shell and is provided with a first rotating arm, a second rotating arm and a third rotating arm which are distributed around a rotary center, the movable contact terminal drives the rotary member to rotate when the rotary member is powered on, and the normally closed movable contact element and the normally closed fixed contact element are enabled to be closed through the first rotating arm Becomes open and the normally open movable contact element and the normally open fixed contact element are changed from open to closed by the second rotating arm, the third rotating arm is used as a trip display lever for indicating the working state of the thermal power over-current relay.

Further, the tip end of the first rotating arm has two first bifurcating pieces between which the upper end of the movable contact terminal is received and one of which is pressed against the elastic contact piece of the normally closed movable contact element; and the tail end of the second rotating arm is provided with two second forked pieces, and the elastic contact piece of the normally open movable contact element is received between the two second forked pieces.

Further, the contact portion of the first bifurcating piece with which the elastic contact piece of the normally closed movable contact element is in contact is a circular arc protrusion.

Furthermore, a hook-shaped piece is arranged at the end part of the third rotating arm, and the state of each contact element in the shell can be confirmed by observing the position of the hook-shaped piece through a window at the upper part of the shell.

Further, the first, second and third rotation arms are spaced 120 degrees apart from each other.

By adopting the technical scheme, the utility model has the beneficial effects that: through combining the first connecting rod and the second connecting rod of current thermal power overcurrent relay and jump and take off the display lever and form integral type rotating member together, reduced part quantity, not only easy to assemble has reduced mechanism linkage moreover for normally open or normally closed switching action normal operating can increase mechanism stability, improves quality and reliability.

Drawings

To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

Fig. 1 is a front view of a prior art thermal overcurrent relay.

Fig. 2 is a perspective view of a rotary structure of the thermal overcurrent relay according to the present invention.

Fig. 3 is an exploded perspective view of a rotary structure of the thermal overcurrent relay shown in fig. 2.

Fig. 4 is a front view of a rotary structure of the thermal overcurrent relay shown in fig. 2.

Fig. 5 is a schematic diagram showing the operation of the rotating structure of the thermal current relay shown in fig. 2 after power is applied.

Detailed Description

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present application, the terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to orientations or positional relationships that are based on the orientation shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be considered as limiting the present invention.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The utility model will now be further described with reference to the accompanying drawings and detailed description.

Referring to fig. 2 and 3, a rotary structure of a thermal overcurrent relay is described. The thermal current relay includes a case 10, a plurality of double alloy plates 11 are mounted in the case 10, and a linkage plate 12 is mounted under the double alloy plates 11. An actuating link 13 is installed at one side in the housing 10, and a compensation dual-alloy plate 14 and a movable contact terminal 15 are installed on the actuating link 13, wherein the lower part of the compensation dual-alloy plate 14 is in contact with the linkage plate 12. The housing 10 further has a normally closed movable contact element 21, a normally closed fixed contact element 22, a normally open movable contact element 23 and a normally open fixed contact element 24 mounted therein.

The rotary structure of the thermal current relay may include a rotary member 30 rotatably installed in the case 10 and having a first arm 32, a second arm 33 and a third arm 34 distributed around a rotation center 31. Preferably, the first pivot arm 32, the second pivot arm 33 and the third pivot arm 34 are on the same plane and spaced 120 degrees apart from each other. Wherein the end of the first rotating arm 32 has two first bifurcating pieces 35, the upper end of the movable contact terminal 15 is received between the two first bifurcating pieces 35 and one (right) of the two first bifurcating pieces 35 is pressed against the elastic contact piece of the normally closed movable contact element 21. Therefore, the movable contact terminal 15 can be rotated by the first rotating arm 32, and the right bifurcating piece of the first rotating arm 32 can move the elastic contact piece of the normally closed movable contact element 21 away from or into contact with the contact piece of the normally closed fixed contact element 22. Preferably, the contact portion of the right first forked blade 35 with the elastic contact blade of the normally closed movable contact element 21 is a circular arc protrusion to reduce the actuation distance. The end of the second rotating arm 33 has two second bifurcating pieces 36, and the elastic contact piece of the normally open movable contact element 23 is received between the two second bifurcating pieces 36. Therefore, the second rotating arm 33 can bring the elastic contact of the normally open movable contact element 23 into and out of contact with the contact of the normally open fixed contact element 24. The third rotating arm 34 serves as a trip display lever for indicating the operation state of the thermal overcurrent relay. Specifically, the end of the third rotating arm 34 has a hook 37, and the state of each contact element in the housing 10 can be confirmed by observing the position of the hook 37 through a window in the upper portion of the housing 10.

Referring to fig. 4 and 5, when the thermal current relay is energized, the dual alloy plate 11 is heated and bent, and the linking plate 12 is driven to push the compensation dual alloy plate 14 on the actuating link 13, and the dual alloy plate 11 is heated to reach a certain bending amount and overcome the tripping load, at this time, the mechanism will trip, so that the movable contact terminal 15 will swing, contact the first forked piece 35 of the first rotating arm 32, and drive the rotating member 30 to rotate, so that the normally closed movable contact element 21 and the normally closed fixed contact element 22 become open from closed, and the second forked piece 36 of the second rotating arm 33 also causes the normally open movable contact element 23 and the normally open fixed contact element 24 to become closed from open. At the same time, the operation of each contact element in the housing 10 can be confirmed by observing the position of the hook-shaped piece 37 through the window on the upper part of the housing 10.

The rotating structure of the thermal power over-current relay has the advantages that the integrated rotating structure replaces two members of a first connecting rod and a second connecting rod and a trip display rod in the prior art, so that the mechanism linkage is reduced, the normally open or normally closed switching action is normally operated, the mechanism stability can be increased, and the quality and the reliability are improved.

While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (5)

1. A rotary structure of a thermal power over-current relay comprises a shell, a plurality of double alloy plates are arranged in the shell, a moving plate is arranged below the double alloy plates, an actuating connecting rod is arranged at one side in the shell, a compensation double alloy plate and a movable contact terminal are arranged on the actuating connecting rod, the lower end of the compensation double alloy plate is connected with the moving plate, a normally closed fixed contact element, a normally closed movable contact element, a normally open fixed contact element and a normally open movable contact element are further arranged in the shell, the rotary structure is characterized by comprising a rotary member, the rotary member is rotatably arranged in the shell and is provided with a first rotary arm, a second rotary arm and a third rotary arm which are distributed around a rotary center, and when the rotary member is electrified, the movable contact terminal drives the rotary member to rotate, the normally closed movable contact element and the normally closed fixed contact element are changed from closed to open by the first rotating arm, and the normally open movable contact element and the normally open fixed contact element are changed from open to closed by the second rotating arm, and the third rotating arm is used as a trip display lever for indicating the working state of the thermal overcurrent relay.

2. A rotary structure of a thermal current relay according to claim 1, wherein an end of the first rotating arm has two first bifurcating pieces, an upper end of the movable contact terminal is received between the two first bifurcating pieces and one of the two first bifurcating pieces is pressed against the elastic contact piece of the normally closed movable contact element; and the tail end of the second rotating arm is provided with two second forked pieces, and the elastic contact piece of the normally open movable contact element is received between the two second forked pieces.

3. A rotary structure of a thermal current relay according to claim 2, wherein a contact portion of the first bifurcating piece contacting the elastic contact piece of the normally closed movable contact member is a circular arc protrusion.

4. A rotary structure of a thermal current relay as claimed in claim 1, wherein a hook-shaped piece is provided at an end of the third rotating arm, and a state of each contact member in the case can be confirmed by observing a position of the hook-shaped piece through a window at an upper portion of the case.

5. A rotary structure of a thermal current relay according to claim 1, wherein the first arm, the second arm and the third arm are spaced 120 degrees apart from each other.

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