CN220753260U - Static contact assembly of switch - Google Patents

Abstract

A static contact assembly of a switch belongs to the technical field of low-voltage electrical appliances. The static contact assembly comprises a static conductive bar, a static conductive block, an arc isolation cover and a magnetism increasing block, wherein the static conductive block is arranged on the static conductive bar, a static contact is fixed on the static conductive bar, the front side of the static conductive block is fixedly provided with the static arc contact, the static conductive block is covered by the arc isolation cover, the arc isolation cover comprises a cavity for covering the static conductive block and a covering sleeve for covering the magnetism increasing block, the arc isolation cover comprises an arc isolation cover front side wall, and the arc isolation cover front side wall is positioned between the static contact and the static arc contact. The advantages are that: the number of parts is reduced by discarding parts specially used for installing the magnetism increasing block, the structure is simplified, the assembly efficiency is improved, and the economy is reflected; preventing downward movement of the arc generated at the stationary arc contact.

Description

Static contact assembly of switch

Technical Field

The utility model belongs to the technical field of piezoelectric devices, and particularly relates to a static contact assembly of a switch.

Background

The switch is widely used in a low-voltage distribution system, and is capable of closing, bearing and switching on and off current under the normal loop condition, so that safety guarantee is provided for a circuit.

The contact system is an important part of the switch and comprises a moving contact and a fixed contact, and the moving contact is contacted with or separated from the fixed contact after acting, so that the switch can switch on or off a circuit. The fixed contact is generally coated with an arc isolation cover, specifically, the arc isolation cover is coated on the fixed contact except for the contact, so that the arc can only move upwards into a grid sheet group in the arc extinguishing chamber after being generated on the contact, and the arc is prevented from moving in other directions; a static striking plate for leading the arc into the arc extinguishing chamber is arranged above the contact, and a magnetism increasing block is arranged on the outer side of the striking plate. In the prior art, the magnetism increasing blocks are fixed in an independent installation mode, so that the number of parts is large, the structure tends to be complex, the assembly links are increased, and the economy is lost.

Disclosure of Invention

The utility model aims to provide a switch static contact assembly which is beneficial to eliminating parts specially used for installing a magnetism increasing block, so that the number of parts is reduced, the structure is simplified, the assembly efficiency is improved, and the economy is embodied.

The utility model aims at achieving the task, and the static contact assembly of the switch comprises a static conductive bar, a static conductive block, an arc isolation cover and a magnetism increasing block, wherein the static conductive block is arranged on the static conductive bar, a static contact is fixed on the static conductive bar, a static arc contact is fixed on the front side of the static conductive block, the arc isolation cover is coated on the static conductive block, the arc isolation cover comprises a cavity for coating the static conductive block and a coating sleeve for coating the magnetism increasing block, the arc isolation cover comprises a front side wall of the arc isolation cover, and the front side wall of the arc isolation cover is positioned between the static contact and the static arc contact.

In a specific embodiment of the present utility model, the static conductive block is integrally disposed with the static conductive bar.

In a specific embodiment of the utility model, the arc-isolating cover of the static contact assembly further comprises a pair of side walls and an arc-isolating cover top wall, the arc-isolating cover is formed into a semi-enclosed structure by a pair of front and rear corresponding cover side walls of the arc-isolating cover, a front side wall of the arc-isolating cover and the arc-isolating cover top wall, and the bottom surface and the rear side surface of the opening of the arc-isolating cover are in contact with the static conductive row.

In another specific embodiment of the utility model, an arc shield front side wall opening for avoiding the static arc contact is formed on the arc shield front side wall of the arc shield.

In another specific embodiment of the utility model, the static contact assembly further comprises a static striking plate, and a static striking plate avoiding opening for avoiding the static striking plate is formed on the top wall of the arc isolation cover.

In yet another specific embodiment of the present utility model, the arc-isolating cover top wall static striking plate avoiding opening is in communication with the arc-isolating cover front side wall opening.

In still another specific embodiment of the present utility model, the width of the magnetism increasing block is adapted to the width of the corresponding portion of the static striking plate, and a side of the magnetism increasing block facing the static striking plate is formed with a magnetism increasing block inclined plane, and the inclination angle of the magnetism increasing block inclined plane is the same as the inclination angle of the static striking plate.

In a further specific embodiment of the utility model, the static conductive bar is in an L shape, a stepping step is arranged at a corner of the static conductive bar, and the static conductive block is arranged on the stepping step.

In a further specific embodiment of the utility model, an embedded groove and a matching rib are formed on the stepping step, a flange is formed at the bottom of the static conductive block and at a position corresponding to the embedded groove, a positioning notch is formed at a position corresponding to the matching rib, the flange is embedded with the embedded groove, and the edge of the positioning notch is embedded with the matching rib.

In yet another embodiment of the present utility model, the cover has a magnetism enhancing block receiving cavity shaped and sized to accommodate the magnetism enhancing block.

According to the technical scheme provided by the utility model, the arc isolation cover is provided with the cladding sleeve, and the magnetism increasing block is accommodated in the cladding sleeve, so that the number of parts is reduced by discarding parts specially used for installing the magnetism increasing block, the structure can be simplified, the assembly efficiency can be improved, and the economy can be reflected. Second, because the front side wall of the arc isolation cover is positioned between the static contact and the static arc contact, the arc generated on the static arc contact can be prevented from moving downwards.

Drawings

Fig. 1 is a perspective exploded view of a switch according to the present utility model;

FIG. 2 is a schematic view of the operating mechanism shown in FIG. 1;

FIG. 3 is a schematic view of the mounting of the mask shown in FIG. 1;

FIG. 4 is a detailed construction view of the base;

FIG. 5 is a schematic view of a moving contact of the contact system shown in FIG. 1;

FIG. 6 is a schematic view of the right side of FIG. 5;

FIG. 7 is a schematic view of the enclosure shown in FIGS. 5 and 6;

FIG. 8 is a block diagram of the stationary contact assembly shown in FIG. 1;

FIG. 9 is an exploded perspective view of FIG. 8;

fig. 10 is a detailed structural view of the conductive block shown in fig. 8 and 9;

FIG. 11 is a detailed block diagram of the arc shield shown in FIG. 9;

fig. 12 is a schematic view of the left side view of fig. 11.

Detailed Description

In order that the technical spirit and advantages of the present utility model may be more clearly understood, reference will now be made in detail to the following examples, which are not intended to limit the scope of the utility model, but rather are merely equivalent in form to the present utility model.

In the following description, all concepts related to the directions or azimuths of up, down, left, right, front and rear are based on the position state of fig. 1, and thus should not be construed as a specific limitation on the technical solution provided by the present utility model.

Referring to fig. 1 and 8-9, the switch is shown to include a contact system 3, the contact system 3 including a stationary contact assembly 32, the stationary contact assembly 32 including a stationary conductive bar 321, a stationary conductive block 322, an arc shield 324, and a magnetism enhancing block 325, the stationary conductive block 322 being disposed on the stationary conductive bar 321, the arc shield 324 being wrapped over the stationary conductive block 322, particularly: a cover 32431 is formed on the arc shield 324, and the magnetism increasing block 325 is accommodated in the cover 32431.

Also shown in fig. 1 are a housing 1, an operating mechanism 2, an arc chute 4, a secondary terminal 5, a transformer assembly 6, a face shield 7, and an interphase barrier 8. The housing 1 is internally provided with the aforementioned contact system 3 and the aforementioned arc extinguishing chamber 4, the aforementioned arc extinguishing chamber 4 being located above the aforementioned contact system 3, that is to say the arc extinguishing chamber 4 being located on one side in the opening direction of the aforementioned contact system 3. The arc extinguishing chamber 4 serves to extinguish the arc generated on the contact system 3 described above.

As shown in fig. 1, the housing 1 includes a base 11 and a bottom plate 12, and the base 11 and the bottom plate 12 are spliced to form the housing.

The contact system 3 includes a moving contact 31 and the above-mentioned fixed contact assembly 32, and the moving contact 31 contacts with or separates from the fixed contact 32 after swinging, and then the circuit breaker is closed or opened. Wherein the movable contact 31 is mounted on the base 11, and the stationary contact 32 is mounted on the bottom plate 12.

The operating mechanism 2 is located on the left side of the base 11 and is used for driving the contact system 3 to operate. The operating mechanism 2 is a drive member of the circuit breaker.

The mask 7 covers the left side of the operating mechanism 2, and the operating mechanism 2 is isolated from the operator by the mask 7. The secondary terminal 5 is mounted on the base 11 and is located on top of the face mask 7. The transformer assembly 6 is sleeved on a conductive circuit of the circuit breaker, specifically on an outgoing line row of the moving contact 31. The interphase separator 8 is arranged on the outlet row side of the shell 1, so that interphase insulation is ensured.

Referring to fig. 2, the aforementioned operating mechanism 2 includes a pair of side plates 21, the pair of side plates 21 being disposed at intervals in a state of facing each other, and other components of the operating mechanism 2 being mounted between the pair of side plates 21. The side plate 21 is provided with a bracket 22, one end of the bracket 22 is fixed to the operating mechanism 2, and the other end is fixedly connected to the mask 7. Specifically, the bracket 22 has one end mounted on the side plate 21 and the other end fixedly connected to the mask 7, thereby improving the strength of the mask 7.

Referring to fig. 3 and fig. 2 in combination, the periphery of the mask 7 is fixed on the base 11, specifically, a first mounting hole 71 is formed at the periphery of the mask 7, correspondingly, a threaded hole 111 is formed in the base 11, and a screw is threaded into the threaded hole 111 after passing through the first mounting hole 71, so as to realize the mounting of the periphery of the mask 7 and the base 11. In order to prevent deformation of the mask 7 and to increase the strength of the mask 7, a second mounting hole 72 is further provided in the middle of the mask 7, and the second mounting hole 72 is fixed to the aforementioned bracket 22.

The bracket 22 is a bent plate and has a "+" shape.

Referring to fig. 4, in the present embodiment, the base 11 has three contact extinguishing cavities, the contact extinguishing cavities on two sides respectively accommodate one contact system 3 and one extinguishing chamber 4, and the contact extinguishing cavity in the middle is empty. The three contact arc extinguishing cavities are arranged side by side. Each contact extinguishing cavity comprises a contact receiving cavity 115 for receiving the aforementioned contact system 3 and an extinguishing chamber cavity 112 for receiving the aforementioned extinguishing chamber 4, the aforementioned contact receiving cavity 115 being in communication with the extinguishing chamber cavity 112. A top wall 113 is formed on the base 11 near the top of the arc extinguishing chamber 4. In this embodiment, the contact system 3 and the arc extinguishing chamber 4 are installed in only two chambers on two sides, i.e. the middle contact arc extinguishing cavity is empty, so as to meet the use requirement of the three-pole circuit breaker.

Specifically, the base 11 is provided with male protruding edges located at two sides of each contact arc extinguishing cavity, and the bottom plate 12 is provided with female protruding edges matched with the male protruding edges, and the male protruding edges are in plug-in fit with the female protruding edges.

The top wall 113 is provided with an insertion groove 1131 and a vent 1132, and the insertion groove 1131 is in insertion fit with a baffle 114. The aforementioned vent 1132 is used to exhaust the gas in the arc extinguishing chamber 4 to the outside of the circuit breaker through the aforementioned vent 1132.

When the baffle 114 is inserted into the insertion groove 1131 of the top wall 113 of the middle chamber, the ventilation hole 1132 is blocked to prevent external contaminants from entering the chamber.

Preferably, the baffle 114 is located on the right side of the top wall 113 (for example, in the position shown in fig. 1).

Referring to fig. 5 and 6, the aforementioned movable contact 31 includes a contact support 311, a conductive block 312, a contact piece 313, a side plate 314, and a cover 315, the contact support 311 is generally made of an insulating material, such as DMC, and a pair of side walls 314 are mounted on both sides of the contact support 311. The plurality of contact pieces 313 are rotatably disposed on the contact support 311, and specifically, the plurality of contact pieces 313 are rotatably disposed on a pair of side walls 314. The contact 313 is located on the rotating side of the movable contact 31, and the conductive block 312 is located on the other side, and the conductive block 312 and the contact 313 are electrically connected by a flexible connection (not shown). The aforementioned flexible connections are typically formed by braiding copper braided wires.

The cover 315 is fixedly mounted on the pair of side walls 314, and is disposed on a side of the contact 313 adjacent to the stationary contact 32.

As shown in fig. 6, the aforementioned contact 313 includes a short contact 3131 and a long contact 3132, the contact on the long contact 3132 is inserted into the interior of the arc extinguishing chamber 4, and the contact on the short contact 3131 is located outside the aforementioned arc extinguishing chamber 4. In the present embodiment, the number of long pads 3132 is only one, and the number of short pads 3131 is a plurality.

Referring to fig. 7, a comb-shaped barrier 3151 is disposed on the cover 315, and the comb-shaped barrier 3151 extends between the adjacent contact pieces 313. Since the insulating cover 31321 (shown in fig. 6) is provided on the head of the long contact 3132, the cells 3152 formed by the comb-shaped barrier 3151 corresponding to the two sides of the long contact 3132 have a larger width so as to satisfy the larger width generated by wearing the insulating cover 31321.

As shown in fig. 8 to 12, the static conductive bar 321 is L-shaped. The end face of the lifting section of the static conductive bar 321 is provided with a static contact 100, a stepping step 3211 is arranged at the corner of the static contact, the static conductive block 322 is arranged on the stepping step 3211, static arc contacts are fixed on the front side of the static conductive block 322, the static contact 100 and the static arc contacts are arranged at intervals, the bottom face of the static conductive block 322 is fixed with the side face of the lifting section, the rear side face of the static conductive block 322 abuts against the stepping step 3211, and the static conductive block 322 and the static conductive bar 321 form a U-shaped circuit.

The static conductive block 322 and the static conductive bar 321 may be integrally disposed.

As shown in fig. 9 and 10, an insertion groove 32111 and an engagement rib 32112 are formed in the stepping step 3211, a flange 3224 is formed at the bottom of the static conductive block 322 at a position corresponding to the insertion groove 32111, a notch 3225 is formed at a position corresponding to the engagement rib 32112, the flange 3224 is engaged with the insertion groove 32111, and the edge of the notch 3225 is engaged with the engagement rib 32112. As shown in the figure, the insertion groove 32111 is formed at a bent portion of the stepped step 3211 near the end of the static conductive bar 321, and the engagement ridge 32112 is formed on a surface of the stepped step 3211 where the static conductive block 322 is engaged. The insert grooves 32111 and mating edges 32112 are provided for positioning of the static conductive segments 322. The two are fixed after being positioned. The above arrangement makes the upper part of the static conductive block 322 and the static conductive row 321 in a spaced state, and forms a U-shaped loop when current passes through. And because the stepping step 3211 is formed, the static conductive bar 321 and the static conductive block 322 are more convenient to be matched and positioned, and the static conductive bar 321 is basically arranged with equal thickness, thereby saving copper materials.

Also shown in fig. 8 and 9 is stationary contact 100 which corresponds to the lower portion of stationary conductive block 322, i.e., fixed to the raised section of stationary conductive row 321. The aforementioned static conductive block 322 is typically made of copper material and is electrically connected to the static conductive row 321 for mating installation with a static strike plate 323 to be further mentioned below.

As shown in fig. 10, the portion below the notch 3225 is defined by the notch 3225 as a static conductive block engagement projection 3221 of the static conductive block 322, and the flange 3224 is defined on a side of the static conductive block engagement projection 3221 facing the step 3211; the cross-sectional shape of the flange 3224 is adapted to the shape of the notch 3225, and the cross-section of the notch 3225 is dovetail-shaped, but other similar shapes are possible.

As shown in fig. 11 and 12, the arc shield 324 of the stationary contact assembly 32 has a pair of side walls 3241, an arc shield front side wall 3242 and an arc shield top wall 3243, the arc shield 324 is formed in a semi-enclosed structure by the pair of side walls 3241, the arc shield front side wall 3242 and the arc shield top wall 3243, and the bottom surface and the rear side surface of the opening of the arc shield 324 are in contact with the stationary conductive row 321. The arc shield front side wall 3242 is located between the stationary contact 100 and the stationary arc contact.

A static arc contact is fixed to the front side of the static conductive block 322, and an arc shield front sidewall opening 32421 for avoiding the static arc contact, i.e., for exposing the static arc contact, is formed in the arc shield front sidewall 3242 of the arc shield 324.

Referring to fig. 8 and 9 in combination with fig. 1 and 2, the stationary contact assembly 32 further includes the stationary striking plate 323 mentioned above, and the upper wall 3243 of the arc-isolating cover is provided with a stationary striking plate avoiding opening 32432 for avoiding the stationary striking plate 323, i.e. for passing one end of the stationary striking plate 323 and electrically connecting with the stationary conductive block 322.

As shown in fig. 12, the arc shield top wall static striking plate avoiding opening 32432 is in communication with the arc shield front side wall opening 32421.

The width of the magnetism increasing block 325 is adapted to the width of the corresponding portion of the static striking plate 323, and a magnetism increasing block inclined surface 3251 is formed on a side of the magnetism increasing block 325 facing the static striking plate 323, and the inclination angle of the magnetism increasing block inclined surface 3251 is the same as the inclination angle of the static striking plate 323.

As shown in fig. 12, the covering sleeve 32431 has a magnetism increasing block receiving cavity 32433, and the magnetism increasing block receiving cavity 32433 is shaped and sized to accommodate the magnetism increasing head 325.

In this embodiment, the magnetism enhancing block 325 is made of a magnetic conductive material, such as silicon steel. The magnetism increasing block 325 is located between the static striking plate 323 and the static conductive bar 321.

As shown in fig. 10, a mounting surface 3222 is formed on the top of the static conductive block 322, and the mounting surface 3222 is used for mounting the static striking plate 323, that is, one end of the static striking plate 323 is mounted on the mounting surface 3222. Specifically, the mounting surface 3222 is provided with a threaded hole, the static striking plate 323 is provided with a mating hole, and a screw is screwed into the threaded hole through the mating hole, so as to fix one end of the static striking plate 323 with the mounting surface 3222.

A contact mounting surface 3223 for mounting and fixing the static arc contact is further provided at the front end of the static conductive block 322.

With continued reference to fig. 9, in order to ensure insulation between the end of the static striking plate 323 in the direction of the grid array of the arc extinguishing chamber 4 and the static conductive bar 321, and to fix the static striking plate 323 and the static conductive bar. An insulating spacer 3231 is provided between the static striking plate 323 and the static conductive bar 321. The tightening hole 3212 is formed on the static conductive bar 321, the insulating sleeve 200 is embedded in the tightening hole 3212, and the insulating sleeve 200 penetrates through the tightening hole 3212 and then is inserted into a corresponding hole on the insulating pad 3231, so that insulation between the static conductive bar 321 and the static striking plate 323 is realized, a screw penetrates through the insulating sleeve 200 and the insulating pad 3231 and then is screwed into the static striking plate 323, and fixed installation between the static conductive bar 321 and the static striking plate 323 is realized.

In summary, in the static contact assembly of the circuit breaker provided by the utility model, the arc isolation cover 324 is arranged on the static contact assembly 32, the arc isolation cover 324 is used for coating the conductive blocks on the static contact, the arc isolation cover 324 is also provided with the magnetism increasing block accommodating cavity 32433 for accommodating the magnetism increasing block 325, so that the positioning of the magnetism increasing block 325 is realized, the positioning structure for positioning the magnetism increasing block 325 is omitted, the number of parts is reduced, the installation is convenient, the structure is simplified, and the economy can be also realized.

Claims (10)

1. The utility model provides a static contact subassembly of switch, this static contact subassembly (32) includes quiet conducting strip (321), quiet conducting block (322), separates arc cover (324) and increases magnetic path (325), quiet conducting block (322) set up on quiet conducting strip (321), be fixed with stationary contact (100) on quiet conducting strip (321), the front side of quiet conducting block (322) is fixed with the stationary arc contact, separates arc cover (324) cladding on quiet conducting block (322), its characterized in that: the arc isolation cover (324) comprises a cavity for coating the static conductive block (322) and a coating sleeve (32431) for coating the magnetism increasing block (325), the arc isolation cover (324) comprises an arc isolation cover front side wall (3242), and the arc isolation cover front side wall (3242) is positioned between the static contact (100) and the static contact.

2. The stationary contact assembly of a switch as set forth in claim 1, wherein: the static conductive block (322) and the static conductive row (321) are integrally arranged.

3. The stationary contact assembly of a switch as set forth in claim 1, wherein: the arc isolation cover (324) of the static contact assembly (32) further comprises a pair of side walls (3241) and an arc isolation cover top wall (3243), the arc isolation cover (324) is formed into a semi-enclosed structure by the pair of arc isolation cover front and back corresponding cover side walls (3241), the arc isolation cover front side wall (3242) and the arc isolation cover top wall (3243), and the bottom surface and the rear side surface of the opening of the arc isolation cover (324) are in contact with the static conductive row (321).

4. A stationary contact assembly of a switch as claimed in claim 3, wherein: an arc shield front side wall opening (32421) for avoiding the static arc contact is formed on an arc shield front side wall (3242) of the arc shield (324).

5. The stationary contact assembly of a switch as set forth in claim 4, wherein: the static contact assembly (32) further comprises a static arc striking plate (323), and an arc striking plate avoiding opening (32432) for avoiding the static arc striking plate (323) on the top wall of the arc striking cover is formed in the top wall (3243) of the arc striking cover.

6. The stationary contact assembly of a switch as set forth in claim 5, wherein: the arc isolation cover top wall static striking plate avoiding opening (32432) is communicated with the arc isolation cover front side wall opening (32421).

7. The stationary contact assembly of a switch as set forth in claim 5, wherein: the width of the magnetism increasing block (325) is matched with the width of the corresponding part of the static striking plate (323), one side of the magnetism increasing block (325) facing the static striking plate (323) is provided with a magnetism increasing block inclined surface (3251), and the inclination angle of the magnetism increasing block inclined surface (3251) is the same as that of the static striking plate (323).

8. The stationary contact assembly of a switch as claimed in claim 1 or 2, wherein: the static conductive bar (321) is L-shaped, a stepping step (3211) is arranged at the corner of the static conductive bar, and the static conductive block (322) is arranged on the stepping step (3211).

9. The stationary contact assembly of a switch as set forth in claim 8, wherein: an insertion groove (32111) and a fitting rib (32112) are formed on the step (3211), a flange (3224) is formed at the bottom of the static conductive block (322) at a position corresponding to the insertion groove (32111), a positioning notch (3225) is formed at a position corresponding to the fitting rib (32112), the flange (3224) is fitted into the insertion groove (32111), and the edge of the positioning notch (3225) is fitted into the fitting rib (32112).

10. The stationary contact assembly of a switch as set forth in claim 1, wherein: the covering sleeve (32431) is provided with a magnetism increasing block accommodating cavity (32433), and the shape and the size of the magnetism increasing block accommodating cavity (32433) are matched with those of the magnetism increasing block (325).