Patent Description:
In the prior art, a casing of a breaking unit and a holder for a movable contact accommodated therein are both made of thermosetting materials. Friction will occur between them due to relative movement, and then pollution particles will be generated. The generation of pollution particles further aggravates the friction between the two, which hinders the moving performance of the moving contact, and long-term friction will lead to mismatch (gap) between silver tips of the moving contact and a fixed contact. In order to obtain good friction between them, it is necessary to form good guidance in shape and material between them. <CIT> discloses a low-voltage contactor, including an actuating unit, a stationary contact and a contact support frame. The contact support frame is operated by the actuating unit and includes movable contacts. The contact support frame comprises a frame part containing connecting devices, a holder part containing holding members suitable for accommodating and holding movable contacts and springs, and the holder part and the frame part are designed such that when the frame part and the hold part are connected to each other, the first end of the spring acts on the movable contact held by the hold part and the second end acts on the frame part. Preferably, the frame part is made of a single piece and made of an electrically insulating material with mechanical properties of rigidity and strength to resist mechanical wear caused by the movement of the contact support frame, for example, made of thermoplastic material. The holder part is made of a single piece and is made of an electrically insulating material, such as a thermosetting plastic material, having such thermal characteristics as resistance to thermal stress. <CIT> discloses a breaker, including a shell, a set of contact assemblies, an actuating member, arc extinguishing devices, arc running pieces, arc striking pieces and magnetic blocking pieces. The housing includes a first half housing and a second half housing. The housing is used to accommodate a set of contact assemblies, actuators, arc extinguishing devices, arc running pieces, arc striking pieces and magnetic blocking pieces. A set of contact assemblies includes a first stationary contact, a second stationary contact and a moving contact. The first stationary contact has a first stationary contact portion, the second stationary contact has a second stationary contact portion, and the movable contact has a first movable contact portion corresponding to the first stationary contact portion and a second movable contact portion corresponding to the second stationary contact portion. <CIT> discloses a switching block unit, which has an actuation device controlling an opening of contacts while moving in translation of a movable contact bridge according to a direction that is perpendicular to a longitudinal axis. Two half-shelves are formed in an identical form and comprise respective ribs collaborating with a recess of a base of a shutting-off device in order to delimit two gas discharge breaking channels, where each channel is connected to an internal volume of a housing by an opening formed in one of the half-shelves.

In order to solve one or more defects in the prior art, according to one aspect of the present disclosure, a modular breaking unit with a holder-guiding assembly is proposed, wherein the modular breaking unit comprises a casing unit.

A holder for holding a movable contact of the modular breaking unit is accommodated in the casing unit.

The movable contact of the modular breaking unit is mounted on the movable contact holder.

The holder-guiding assembly is installed in the casing unit and arranged to support and guide the movable contact holder to move between an open position and a closed position.

The holder-guiding assembly is made of thermoplastic material.

The movable contact holder is made of thermosetting plastic material.

According to some embodiments, the holder-guiding assembly includes a first guide and a second guide.

The first guide is disposed inside the casing unit and supports one end of the movable contact holder.

The second guide is disposed at an opening of the casing unit and supports the other end of the movable contact holder.

According to some embodiments, the first guide has a first guiding through hole.

The second guide has a second guiding through hole.

The movable contact holder passes through the first guiding through hole1 and the second guiding through hole.

When the movable contact holder reciprocates between the open position and the closed position, an outer peripheral surface of the movable contact holder is in frictional contact with a first inner peripheral surface of the first guiding through hole and a second inner peripheral surface of the second guiding through hole, respectively.

According to some embodiments, the movable contact holder is provided with a movable contact holding through hole.

A holding spring is accommodated in the movable contact holding through hole.

One end of the holding spring abuts against an inner surface of the movable contact holding through hole.

The other end of the holding spring elastically presses the movable contact against the inner surface of the movable contact holding through hole.

Since the friction between the movable contact holder and the first guide as well as the second guide is the friction between thermosetting plastic materials, the self-lubricating function of thermoplastic plastic materials can be fully exerted, thus significantly reducing the friction between the movable contact holder and the first guide and the second guide, and further significantly reducing the generation of pollution particles.

According to the above configurations of the present disclosure, motion performance of the moving contact is greatly improved and the risk of mismatch (gap) between the silver tips between the moving contact and the fixed contact due to long-term friction is avoided.

According to some embodiments, an enhancing rib is provided on the outer peripheral surface of the first guide.

According to some embodiments, a fitting groove is provided on the outer peripheral surface of the second guide.

An edge of the opening of the casing is fitted in the fitting groove.

According to some embodiments, the first guide is an integrally formed single piece.

The second guide is an integrally formed single piece.

The movable contact holder is first assembled with the first guide and the second guide, and then assembled in the casing unit.

According to some embodiments, the first guide includes a first upper guide and a first lower guide which are formed separately.

The second guide includes a second upper guide and a second lower guide formed separately.

The first guiding through hole is formed when the first upper guide and the first lower guide are assembled together.

The second guiding through hole is formed when the second upper guide and the second lower guide are assembled together.

According to some embodiments, the casing unit includes an upper casing and a lower casing that can be fitted together.

The first upper guide and the second upper guide are integrally formed with the upper casing.

The first lower guide and the second lower guide are integrally formed with the lower casing.

According to the solutions disclosed by the invention, the complexity and cost of industrial assembly can be greatly simplified, whether the first guide and the second guide are integrally formed or separately formed.

According to some embodiments, a contactor is proposed that comprises at least one modular breaking unit as described above.

So far, in order that the detailed description of this disclosure can be better understood and the contribution of this disclosure to the prior art can be better recognized, this disclosure has summarized the content of this disclosure quite broadly. Of course, embodiments of the present disclosure will be described below and will form the subject matter of the appended claims.

Those skilled in the art will have a better understanding of this disclosure through the following drawings, and the advantages of this disclosure can be more clearly reflected.

Hereinafter, specific embodiments according to the present disclosure will be described in detail with reference to various drawings.

According to one embodiment of the present disclosure, as shown in <FIG>, a modular breaking unit <NUM> having a holder-guiding assembly <NUM> is proposed, wherein the modular breaking unit <NUM> includes a casing unit <NUM>.

For the sake of clarity, <FIG> shows a fixed contact <NUM> and only the lower case of the casing unit <NUM>.

A holder <NUM> for holding a movable contact of the modular breaking unit <NUM> is accommodated in the casing unit <NUM>.

The movable contact <NUM> of the modular breaking unit <NUM> is mounted on the movable contact holder <NUM>.

The holder-guiding assembly <NUM> is installed in the casing unit <NUM> and is configured to support and guide the movable contact holder <NUM> to move between an open position and a closed position, and then under the driving of the movable contact holder <NUM>, the movable contact <NUM> installed thereon is separated from or contacted with the fixed contact <NUM>.

The holder-guiding assembly <NUM> is made of thermoplastic material.

The movable contact holder <NUM> is made of thermosetting plastic material.

The materials of the holder-guiding assembly <NUM> and the movable contact holder <NUM> are selected so that they can withstand a temperature of at least <NUM> degrees Celsius.

According to the above embodiments of the present disclosure, the holder-guiding assembly <NUM> includes a first guide <NUM>-<NUM> and a second guide <NUM>-<NUM>.

The first guide <NUM>-<NUM> is disposed inside the casing unit <NUM> and supports one end of the movable contact holder <NUM>.

The second guide <NUM>-<NUM> is disposed at an opening <NUM>-<NUM> of the casing unit <NUM> and supports the other end of the movable contact holder <NUM>. As shown in <FIG>, a portion of the movable contact holder <NUM> protrudes from the opening <NUM>-<NUM>.

According to the above embodiments of the present disclosure, as shown in <FIG> and <FIG>, the first guide <NUM>-<NUM> has a first guiding through hole <NUM>-<NUM>-<NUM>. The second guide <NUM>-<NUM> has a second guiding through hole <NUM>-<NUM>-<NUM>.

The movable contact holder <NUM> passes through the first guiding through hole <NUM>-<NUM>-<NUM> and the second guiding through hole <NUM>-<NUM>-<NUM>.

When the movable contact holder <NUM> reciprocates between the open position and the closed position, the outer peripheral surface of the movable contact holder <NUM> is in frictional contact with a first inner peripheral surface <NUM>-<NUM>-<NUM>-<NUM> of the first guiding through hole <NUM>-<NUM>-<NUM> and a second inner peripheral surface <NUM>-<NUM>-<NUM>-<NUM> of the second guiding through hole <NUM>-<NUM>-<NUM>, respectively.

According to the above embodiments of the present disclosure, the movable contact holder <NUM> is provided with a movable contact holding through hole <NUM>-<NUM>.

A holding spring <NUM> is accommodated in the movable contact holding through hole <NUM>-<NUM>.

One end of the holding spring <NUM> abuts against an inner surface <NUM>-<NUM>-<NUM> of the movable contact holding through hole <NUM>-<NUM>.

The other end of the holding spring <NUM> elastically presses the movable contact <NUM> against the inner surface <NUM>-<NUM>-<NUM> of the movable contact holding through hole <NUM>-<NUM>.

Since the friction between the movable contact holder <NUM> and the first guide <NUM>-<NUM> as well as the second guide <NUM>-<NUM> is the friction between thermosetting plastic materials, the self-lubricating function of thermoplastic plastic materials can be fully exerted, thus significantly reducing the friction between the movable contact holder <NUM> and the first guide <NUM>-<NUM> and the second guide <NUM>-<NUM>, and further significantly reducing the generation of pollution particles.

According to the above embodiments of the present disclosure, as shown in <FIG>, a enhancing rib <NUM>-<NUM>-<NUM> is provided on the outer peripheral surface of the first guide <NUM>-<NUM>, thereby enhancing the mechanical strength and durability of the first guide.

According to the above embodiments of the present disclosure, a fitting groove <NUM>-<NUM>-<NUM> is provided on the outer peripheral surface of the second guide <NUM>-<NUM>.

As shown in <FIG>, an edge of the opening <NUM>-<NUM> is fitted in the fitting groove <NUM>-<NUM>-<NUM>.

According to the above embodiments of the present disclosure, as shown in <FIG> and <FIG>, the first guide <NUM>-<NUM> is an integrally formed single piece. The second guide <NUM>-<NUM> is an integrally formed single piece.

The movable contact holder <NUM> is first assembled with the first guide <NUM>-<NUM> and the second guide <NUM>-<NUM>, and then assembled in the casing unit <NUM>.

According to some embodiments of the present disclosure, as shown in <FIG> and <FIG>, the first guide <NUM>-<NUM> includes a first upper guide <NUM>-<NUM>-<NUM> and a first lower guide <NUM>-<NUM>-<NUM> which are formed separately.

The second guide <NUM>-<NUM> includes a second upper guide <NUM>-<NUM>-<NUM> and a second lower guide <NUM>-<NUM>-<NUM> formed separately.

The first guiding through hole <NUM>-<NUM>-<NUM> is formed when the first upper guide <NUM>-<NUM>-<NUM> and the first lower guide <NUM>-<NUM>-<NUM> are assembled together.

The second guiding through hole <NUM>-<NUM>-<NUM> is formed when the second upper guide <NUM>-<NUM>-<NUM> and the second lower guide <NUM>-<NUM>-<NUM> are assembled together.

According to the above embodiments of the present disclosure, the casing unit <NUM> includes an upper casing (not shown) and a lower casing (as shown in <FIG>) that can be fitted together.

The first upper guide <NUM>-<NUM>-<NUM> and the second upper guide <NUM>-<NUM>-<NUM> are integrally formed with the upper casing.

The first lower guide <NUM>-<NUM>-<NUM> and the second lower guide <NUM>-<NUM>-<NUM> are integrally formed with the lower casing.

Claim 1:
A modular breaking unit (<NUM>) with a holder-guiding assembly (<NUM>), wherein:
the modular breaking unit (<NUM>) comprises a casing unit (<NUM>);
a movable contact holder (<NUM>) for holding a movable contact (<NUM>) of the modular breaking unit (<NUM>) is accommodated in the casing unit (<NUM>);
the movable contact (<NUM>) of the modular breaking unit (<NUM>) is mounted on the movable contact holder (<NUM>);
the holder-guiding assembly (<NUM>) is installed in the casing unit (<NUM>) and arranged to support and guide the movable contact holder (<NUM>) to move between an open position and a closed position;
the holder-guiding assembly (<NUM>) is made of thermoplastic material;
the movable contact holder (<NUM>) is made of thermosetting plastic material,
characterized in that
the holder-guiding assembly (<NUM>) comprises a first guide (<NUM>-<NUM>) and a second guide (<NUM>-<NUM>), the first guide (<NUM>-<NUM>) is disposed inside the casing unit (<NUM>) and supports one end of the movable contact holder (<NUM>), the second guide (<NUM>-<NUM>) is disposed at an opening (<NUM>-<NUM>) of the casing unit (<NUM>) and supports the other end of the movable contact holder (<NUM>), the first guide (<NUM>-<NUM>) and the second guide (<NUM>-<NUM>) are sequentially arranged in a movement direction of the moveable contact holder (<NUM>).