Ceramic cup contactor

Abstract

The utility model provides a ceramic cup contactor which comprises a ceramic cup body, a sealing cover, an electromagnetic driver and a contact assembly. The sealing cover is arranged in a cup opening of the ceramic cup body in a sinking mode, sealing glue is poured between the sealing cover and the cup edge of the ceramic cup body, and the electromagnetic driver and the contact assembly are arranged in a sealed inner cavity defined by the ceramic cup body and the sealing cover in a linkage mode. According to the utility model, the contactor core body is sealed in the ceramic cup by sealing the glue between the sealing cover and the ceramic cup opening, so that the contactor core body is prevented from being oxidized, and the contactor can be used under high voltage. The ceramic cup body is vacuumized and then is filled with nitrogen or other insulating arc extinguishing gases to form an oxygen-free environment, and due to the high gas sealing performance and the ultra-low water permeability of the ceramic cavity, oxidation of the contactor core body and degradation of the atmosphere of the sealed inner cavity can be further avoided. In addition, the ceramic cup is high in hardness and not prone to oxidation corrosion, the size of the contactor can be effectively reduced, welding on a circuit board is facilitated, the sealing structure of the ceramic cup is low in process difficulty, and cost reduction and popularization are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of contactor manufacturing, in particular to a ceramic cup contactor. Background Art

[0002] In the automatic control circuit, the contactor is equivalent to an automatic switch, which plays a role in safety protection, circuit switching and other functions. The contactor has a moving contact and a static contact inside. The moving contact is controlled by an electronic or mechanical driver to contact or separate with the static contact, thereby realizing the on-off control of the circuit. As the voltage of the contactor coupling circuit increases, an arc may be generated when the moving contact and the static contact are switched on and off. The arc will generate open flames and high temperatures, causing the metal inside the contactor to vaporize, ablate and oxidize, thereby shortening the life of the contactor or even damaging the contactor.

[0003] In order to solve the above problems, some high-end contactors will use high-density iron cups, ceramic cups or glass cups to seal the contactor core and evacuate it. The iron cup is easy to oxidize, so a protective shell needs to be set outside the iron cup. The disadvantage is that the contactor is large in size, not suitable for welding on the circuit board, and the cost is high; and the ceramic cup is difficult to seal and weld, so it is necessary to use a special process to achieve a sealed connection between the ceramic cup and the metal material when making the ceramic cup. Not only is the process complicated but the cost is high; the glass cup is fragile and the sealing difficulty is also very high. Therefore, due to factors such as complex processes, bloated size, and high costs, the scope of use of these vacuum contactors is limited, and it is difficult to use them in ordinary electrical circuits. Utility Model Content

[0004] In view of the defects of the background technology, the utility model proposes a ceramic cup contactor, which seals the contactor core inside the ceramic cup by sealing glue between the cover and the ceramic cup mouth, thereby avoiding oxidation of the contactor core and loss of airtightness, so that the contactor can be used at a higher operating voltage; and the ceramic cup contactor has low manufacturing cost, small size and wide application range.

[0005] The utility model proposes a ceramic cup contactor, comprising a ceramic cup body, a cover, an electromagnetic driver and a contact assembly;

[0006] The cover is sunken in the cup mouth of the ceramic cup body, sealing glue is filled between the cover and the cup edge of the ceramic cup body, and the electromagnetic driver and the contact assembly are linked and arranged in a sealed inner cavity enclosed by the ceramic cup body and the cover.

[0007] Preferably, the sealed inner cavity is evacuated to a vacuum.

[0008] Preferably, the sealed inner cavity is filled with insulating arc-extinguishing gas.

[0009] Preferably, the sealing cover is provided with an air nozzle.

[0010] Preferably, a bracket is provided on the inner side of the sealing cover facing the sealed inner cavity, and the electromagnetic driver is installed on the bracket;

[0011] The electromagnetic driver comprises an iron core wound with a coil and an elastic seesaw facing a magnetic pole at one end of the iron core;

[0012] The contact assembly comprises a group of moving contacts and a group of stationary contacts which match each other. The elastic seesaw is connected with a conducting plate, and the group of moving contacts is arranged on the conducting plate.

[0013] Preferably, at least two groups of welding feet are provided on the outer side of the cover, wherein one group of welding feet is electrically connected to a group of stationary contacts, and the other group of welding feet is electrically connected to the coil.

[0014] Preferably, a yoke clamp is provided outside the iron core.

[0015] Preferably, at least one arc-striking permanent magnet is disposed on each of the two sides of the contact assembly.

[0016] Preferably, the conductive plate is a copper plate.

[0017] Preferably, the conducting plate is a silver-plated copper plate.

[0018] The beneficial effects of the utility model include: by sealing the contactor core inside the ceramic cup with glue between the sealing cover and the ceramic cup mouth, oxidation of the contactor core can be avoided, so that the contactor can be used at a higher working voltage; the sealed inner cavity is evacuated to a vacuum or filled with nitrogen to form an oxygen-free environment, which can further avoid oxidation of the contactor core and degradation of the atmosphere in the sealed inner cavity; the ceramic cup sealing structure of the utility model has low process difficulty, which is conducive to cost reduction and promotion; the ceramic cup itself has high hardness and is not easy to oxidize and corrode, which can effectively reduce the volume of the contactor and facilitate welding on the circuit board; the conduction plate made of silver-plated copper plate material has a low resistance value, which can not only reduce the heat generation, but also has strong antioxidant ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is described in detail below with reference to the embodiments and drawings, wherein:

[0020] Figure 1 It is a stereogram of the ceramic cup contactor of the utility model.

[0021] Figure 2 It is a structural explosion diagram of the ceramic cup contactor of the utility model.

[0022] Figure 3 This is a structural diagram of the contactor core of the utility model.

[0023] Reference numerals:

[0024] 1-ceramic cup body, 11-cup edge, 12-sealed inner cavity, 13-boss, 2-cover, 21-air nozzle, 22-bracket, 23-welding foot, 3-electromagnetic driver, 31-iron core, 32-elastic seesaw, 33-yoke iron clamp, 4-contact assembly, 41-moving contact, 42-static contact, 43-conduction plate, 5-sealing colloid, 6-arc-striking permanent magnet. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0027] The principle of the present utility model is described in detail below with reference to the accompanying drawings and embodiments.

[0028] The utility model proposes a ceramic cup contactor, such as Figure 1-3 As shown, it includes a ceramic cup body 1, a cover 2, an electromagnetic driver 3 and a contact assembly 4; the cover 2 is sunken and arranged in the cup mouth of the ceramic cup body 1, and a sealing glue is filled between the cover 2 and the cup edge 11 of the ceramic cup body 1, and the electromagnetic driver 3 and the contact assembly 4 are linked and arranged in a sealed inner cavity 12 enclosed by the ceramic cup body 1 and the cover 2. By sealing the contactor core in the ceramic cup with the sealing glue between the cover 2 and the ceramic cup mouth, oxidation of the contactor core and deterioration of the atmosphere in the sealed inner cavity can be avoided, so that the contactor can be used at a higher working voltage.

[0029] In this embodiment, the ceramic cup body 1 is square as a whole, and can also be cylindrical or other shapes according to actual needs. A boss 13 is provided in the cup mouth of the ceramic cup body 1. When sealing, the cover 2 is placed on the boss 13, and the cover 2 plays a sealing role. Then, a sealant is poured between the cover 2 and the ceramic cup mouth. The sealant material is epoxy resin, and then the epoxy resin is crystallized by baking to form a sealant body 5. The sealant will completely block the gap between the cover 2 and the ceramic cup body 1, and with the high-density ceramic cup body 1, the air tightness and water tightness of the sealed inner cavity 12 are ensured. The cover 2 is penetrated with a gas nozzle 21, and the sealed inner cavity 12 can be evacuated to form an oxygen-free environment through the gas nozzle 21, further avoiding oxidation of the contactor core composed of the electromagnetic driver 3 and the contact assembly 4. It is difficult to create an absolute vacuum environment with the existing industrial technology level. After evacuating, the insulating arc-extinguishing gas can be continued to be filled into the sealed inner cavity 12 through the gas nozzle 21 to further reduce the oxygen inventory. Preferably, the insulating arc-extinguishing gas filled in is nitrogen.

[0030] In this embodiment, the cover 2 also has a structural support function. A bracket 22 is provided on the inner side of the cover 2 facing the sealed inner cavity 12, and the electromagnetic driver 3 is installed on the bracket 22. The electromagnetic driver 3 includes an iron core 31 wound with a coil and an elastic seesaw 32 facing the magnetic pole at one end of the iron core 31; the contact assembly 4 includes a group of matching moving contacts 41 and a group of stationary contacts 42, and the elastic seesaw 32 is connected to a conducting plate 43, and the moving contact 41 is arranged on the conducting plate 43. When the coil is energized, the elastic seesaw 32 overcomes the elastic force and presses down under the action of the magnetic force, so that the moving contact 41 and the stationary contact 42 are in close contact and conduct the circuit; when the coil is de-energized, the magnetic force disappears, and the moving contact 41 and the stationary contact 42 are disconnected when the elastic seesaw 32 rebounds under the action of the elastic force. A yoke iron clamp 33 is provided on the outside of the iron core 31 to strengthen the magnetic force of the coil.

[0031] The life of the contactor is mainly affected by two aspects. First, the open flame and high temperature generated by the arc will cause the metal material inside the contactor to oxidize. Second, the high temperature generated by the high voltage at the moment of conduction on the conduction plate 43 will melt the welding point of the moving contact 41 or the static contact 42, resulting in the two contacts being unable to disconnect after welding, thus damaging the contactor and making it ineffective. Therefore, according to the formula power P = I 2 The smaller the resistance of the conducting plate 43, the lower the heat generation, and the higher the working voltage that the contactor can withstand. The conducting plate 43 can be made of a copper plate or a silver-plated copper plate. Compared with the two materials, the copper plate has a lower cost; the silver-plated copper plate has a lower resistance value, and the copper plate has strong oxidation resistance and arc welding resistance after silver plating, and can operate at a higher working voltage, and the product life is longer.

[0032] In this embodiment, at least two groups of welding pins 23 are provided on the outer side of the cover 2, one group of welding pins 23 is electrically connected to a group of static contacts 42, and the other group of welding pins 23 is electrically connected to the coil. In order to facilitate the welding of the contactor on the circuit board, the height of the gas nozzle 21 is lower than the height of the welding pins 23. After the nitrogen filling is completed, epoxy resin can be injected into the gas nozzle 21 to seal it, and then the gas nozzle 21 can be cut off.

[0033] In this embodiment, an arc-striking permanent magnet 6 is provided on each side of the contact assembly 4. When an arc is generated between the moving contact 41 and the stationary contact 42, the arc-striking permanent magnet 6 will pull the arc outward to avoid the arcs from crossing. Of course, two or more arc-striking permanent magnets 6 may be provided on each side to increase their ability to guide the arc.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A ceramic cup contactor, characterized in that: It includes a ceramic cup body, a cover, an electromagnetic driver and a contact assembly; The cover is sunken in the mouth of the ceramic cup body, sealing glue is filled between the cover and the edge of the ceramic cup body, and the electromagnetic driver and the contact assembly are linked and arranged in a sealed inner cavity enclosed by the ceramic cup body and the cover.

2. The ceramic cup contactor according to claim 1, characterized in that The sealed inner cavity is evacuated to a vacuum.

3. The ceramic cup contactor according to claim 1, characterized in that: The sealed inner cavity is filled with insulating arc-extinguishing gas.

4. The ceramic cup contactor according to claim 2 or 3, characterized in that: The sealing cover is provided with an air nozzle.

5. The ceramic cup contactor according to claim 4, characterized in that: The inner side of the sealing cover facing the sealed inner cavity is provided with a bracket, and the electromagnetic driver is installed on the bracket; The electromagnetic driver comprises an iron core wound with a coil and an elastic seesaw facing a magnetic pole at one end of the iron core; The contact assembly comprises a group of moving contacts and a group of stationary contacts that match each other. The elastic seesaw is connected to a conducting plate, and the group of moving contacts is arranged on the conducting plate.

6. The ceramic cup contactor according to claim 5, characterized in that: At least two groups of welding feet are arranged on the outer side of the cover, one group of welding feet is electrically connected to the group of static contacts, and the other group of welding feet is electrically connected to the coil.

7. The ceramic cup contactor according to claim 6, characterized in that A yoke iron clamp is arranged outside the iron core.

8. The ceramic cup contactor according to claim 5, characterized in that: At least one arc-striking permanent magnet is respectively arranged on the periphery of two sides of the contact assembly.

9. The ceramic cup contactor according to claim 5, characterized in that: The conducting plate is a copper plate.

10. The ceramic cup contactor according to claim 5, characterized in that: The conducting plate is a silver-plated copper plate.

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