CN115458365A - High voltage direct current contactor - Google Patents

High voltage direct current contactor Download PDF

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Publication number
CN115458365A
CN115458365A CN202211115622.XA CN202211115622A CN115458365A CN 115458365 A CN115458365 A CN 115458365A CN 202211115622 A CN202211115622 A CN 202211115622A CN 115458365 A CN115458365 A CN 115458365A
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CN
China
Prior art keywords
ceramic cavity
voltage direct
current contactor
detection unit
gas detection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211115622.XA
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Chinese (zh)
Inventor
徐益飞
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Weifa Electronic Technology Changzhou Co ltd
Original Assignee
Weifa Electronic Technology Changzhou Co ltd
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Publication date
Application filed by Weifa Electronic Technology Changzhou Co ltd filed Critical Weifa Electronic Technology Changzhou Co ltd
Priority to CN202211115622.XA priority Critical patent/CN115458365A/en
Publication of CN115458365A publication Critical patent/CN115458365A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/08—Indicators; Distinguishing marks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/54—Contact arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/023—Details concerning sealing, e.g. sealing casing with resin
    • H01H2050/025—Details concerning sealing, e.g. sealing casing with resin containing inert or dielectric gasses, e.g. SF6, for arc prevention or arc extinction

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)

Abstract

The invention provides a high voltage direct current contactor, comprising: the device comprises a ceramic cavity, a first contact, a second contact, a third contact and a fourth contact, wherein the ceramic cavity is internally provided with two static contacts and a movable contact piece which are arranged side by side, the movable contact piece and the two static contacts are respectively arranged oppositely along the vertical direction, and protective gas is filled in the ceramic cavity; the gas detection unit is arranged on the inner wall of the ceramic cavity and is used for generating a corresponding electric signal according to the change of the air pressure in the ceramic cavity; the circuit board is arranged on the outer wall of the ceramic cavity and connected with the gas detection unit, and the circuit board is used for receiving an electric signal and monitoring the pressure change in the ceramic cavity according to the electric signal. According to the high-voltage direct-current contactor, the gas detection unit is arranged in the ceramic cavity of the high-voltage direct-current contactor to monitor the change of the air pressure in the cavity in real time, so that whether gas leakage occurs in the ceramic cavity can be judged in time, and the reliability of arc extinction of the high-voltage direct-current contactor is further ensured.

Description

High voltage direct current contactor
Technical Field
The invention relates to the technical field of contactors, in particular to a high-voltage direct-current contactor.
Background
In the related art, it is common to fill a protective gas inside a high voltage direct current contactor to suppress an arc generated between contacts in the high voltage direct current contactor, improve an arc time, and rapidly dissipate heat. However, the high-voltage direct-current contactor has low reliability in arc extinction.
Disclosure of Invention
In order to solve the technical problems, the invention provides the high-voltage direct-current contactor, wherein a gas detection unit is arranged in a ceramic cavity of the high-voltage direct-current contactor so as to monitor the change of air pressure in the cavity in real time, so that whether the ceramic cavity has gas leakage or not can be judged in time, and the reliability of arc extinction of the high-voltage direct-current contactor is further ensured.
The technical scheme adopted by the invention is as follows:
a high voltage direct current contactor comprising: the device comprises a ceramic cavity, a first contact, a second contact and a third contact, wherein the ceramic cavity is internally provided with two static contacts and a movable contact piece which are arranged side by side, the movable contact piece and the two static contacts are respectively arranged oppositely along the vertical direction, and protective gas is filled in the ceramic cavity; the gas detection unit is arranged on the inner wall of the ceramic cavity and is used for generating a corresponding electric signal according to the change of the air pressure in the ceramic cavity; the circuit board is arranged on the outer wall of the ceramic cavity and connected with the gas detection unit, and the circuit board is used for receiving the electric signals and monitoring the air pressure change in the ceramic cavity according to the electric signals.
In an embodiment of the present invention, the ceramic cavity is opened with a through hole, wherein the high voltage dc contactor further includes: and one end of the connecting electrode is embedded in the through hole and is connected with the gas detection unit, and the other end of the connecting electrode is connected with the circuit board.
In one embodiment of the present invention, one end of the connection electrode is connected to the gas detection unit through a conductive paste.
In one embodiment of the invention, the gas detection unit is a capacitive pressure sensor.
In one embodiment of the invention, the gas detection unit is a piezoresistive pressure sensor.
In one embodiment of the present invention, the high voltage dc contactor further comprises: and the driving unit is arranged below the ceramic cavity and used for controlling the connection state of the movable contact piece and the two static contacts so as to adjust the working state of the high-voltage direct-current contactor.
In one embodiment of the present invention, the driving unit includes: the driving coil is fixedly arranged below the ceramic cavity; the movable iron core is movably arranged in a space surrounded by the driving coil; the push rod is arranged along the vertical direction, the lower end of the push rod is arranged in the movable iron core, and the upper end of the push rod is connected with the movable contact piece; the reset spring is sleeved outside the lower part of the push rod.
The invention has the beneficial effects that:
according to the invention, the gas detection unit is arranged in the ceramic cavity of the high-voltage direct-current contactor to monitor the change of the air pressure in the cavity in real time, so that whether the ceramic cavity has gas leakage or not can be judged in time, and the reliability of arc extinction of the high-voltage direct-current contactor is further ensured.
Drawings
Fig. 1 is a schematic structural diagram of a high voltage direct current contactor according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a high voltage dc contactor according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the related technology, the high-voltage direct-current contactor needs to cut off large voltage current when in use, electric arcs of thousands of degrees centigrade can be generated between contacts, and the generation of the electric arcs has great damage to the contacts of the contactor and can influence the service life of products. Therefore, it is common to fill the inside of the high voltage dc contactor with a protective gas (about 1-5 atm), which is completely sealed by the cavity to suppress arc generation, improve arc time, and rapidly dissipate heat, thereby achieving rapid arc cooling and quenching.
The magnitude of the shielding gas pressure affects the arc overvoltage capability and thus the arcing time and extinguishing speed of the arc. When gas leaks, the effective collision times among particles and the energy of electrons are affected, so that the formation of arc plasma and the arc extinguishing effect are affected. In the related art, it is impossible to monitor whether gas leaks, and thus, the reliability of arc extinction is low.
Therefore, the gas detection unit is arranged in the ceramic cavity of the high-voltage direct-current contactor to monitor the change of the air pressure in the cavity in real time, so that whether the ceramic cavity has gas leakage or not can be judged in time, and the reliability of arc extinction of the high-voltage direct-current contactor is further ensured.
Specifically, fig. 1 is a schematic structural diagram of a high-voltage direct-current contactor according to an embodiment of the present invention.
As shown in fig. 1, the high voltage direct current contactor according to an embodiment of the present invention may include: a ceramic chamber 100, a gas detection unit 200, and a circuit board 300.
The ceramic cavity 100 is internally provided with two static contacts 110 and a movable contact piece 120 which are arranged side by side, the movable contact piece 120 and the two static contacts 110 are respectively arranged oppositely along the vertical direction, and the ceramic cavity 100 is filled with protective gas; the gas detection unit 200 is disposed on an inner wall of the ceramic chamber 100, and the gas detection unit 200 is configured to generate a corresponding electrical signal according to a change in air pressure inside the ceramic chamber 100; the circuit board 300 is disposed on an outer wall of the ceramic chamber 100, the circuit board 300 is connected to the gas detection unit 200, and the circuit board 300 is configured to receive an electrical signal and monitor a change in air pressure in the ceramic chamber 100 according to the electrical signal.
Specifically, the high-voltage direct-current contactor can be controlled to be in a closed working state by driving the movable contact piece 120 to be simultaneously communicated with the two stationary contacts 110, and the high-voltage direct-current contactor can be controlled to be in an open working state by driving the movable contact piece 120 to be simultaneously opened with the two stationary contacts 110. In the process of driving the movable contact piece 120 to be simultaneously connected/disconnected with the two stationary contacts 110, the protective gas filled in the ceramic cavity can inhibit the generation of electric arcs, improve the arcing time and quickly dissipate heat. Wherein, the protective gas can be nitrogen-hydrogen mixed inert gas.
Meanwhile, a corresponding electrical signal may be generated by the gas detection unit 200 according to a change in the gas pressure within the ceramic chamber 100. As a possible implementation manner, the gas detecting unit 200 may be a capacitive pressure sensor, which is formed by a sensing diaphragm on a substrate on the inner wall of the ceramic chamber 100. When the protective gas acts on the sensing diaphragm, the sensing diaphragm deforms, the capacitance formed by the sensing diaphragm and the ceramic cavity 100 substrate changes, and a corresponding electric signal is generated; as a possible embodiment, the gas detecting unit 200 may be a piezoresistive pressure sensor, a wheatstone bridge circuit corresponding to the piezoresistive pressure sensor is printed on the sensing diaphragm, no circuit needs to be printed on the substrate on the inner wall of the ceramic cavity 100, and when the protective gas acts on the sensing diaphragm, the sensing diaphragm deforms, and the resistance value of the resistance in the wheatstone bridge circuit changes, so as to generate a corresponding electrical signal.
Further, the circuit board 300 receives the electrical signal, processes and analyzes the electrical signal to obtain a variation of the air pressure in the ceramic chamber, and determines whether the air leakage occurs in the ceramic chamber 100 according to the variation of the air pressure.
In an embodiment of the present invention, as shown in fig. 2, the ceramic cavity is provided with a through hole, wherein the high voltage dc contactor further includes: and a connection electrode 400, one end of the connection electrode 400 being embedded in the through hole and connected to the gas detection unit 200, and the other end of the connection electrode 400 being connected to the circuit board 300.
In one embodiment of the present invention, as shown in fig. 2, one end of the connection electrode 400 is connected to the gas detection unit 200 through the conductive paste 500.
Specifically, the gas detection unit 200 may be connected to the circuit board 300 through the connection electrode 400. One end of the connection electrode 400 is connected to the gas detection unit 200 through the conductive paste 500, so that on one hand, the purpose of electrical signal transmission can be achieved, and on the other hand, the protection gas pressure in the ceramic cavity 100 can be effectively prevented from leaking out from the connection electrode 400.
How to adjust the operating state of the high voltage direct current contactor is described in detail below in conjunction with the specific structure of the high voltage direct current contactor.
In one embodiment of the present invention, as shown in fig. 2, the high voltage dc contactor further includes: and the driving unit 600, the driving unit 600 is arranged below the ceramic cavity 100, and the driving unit 600 is used for controlling the connection state of the brake contact sheet 120 and the two stationary contacts 110 so as to adjust the working state of the high-voltage direct-current contactor.
In one embodiment of the present invention, as shown in fig. 2, the driving unit 600 includes: a drive coil 610, a plunger 620, a push rod 630 and a return spring 640.
Wherein, the driving coil 610 is fixedly arranged below the ceramic cavity 100; the movable iron core 620 is movably arranged in the space surrounded by the driving coil 610; the push rod 630 is arranged along the vertical direction, the lower end of the push rod 630 is arranged in the movable iron core 620, and the upper end of the push rod 630 is connected with the movable contact piece 120; the return spring 640 is sleeved outside the lower part of the push rod 630.
Specifically, when the driving coil 610 is energized, the driving coil 610 generates a magnetic force to enable the movable iron core 620 to drive the push rod 630 to move vertically upwards, and further the movable contact piece 120 is communicated with the two stationary contacts 110 simultaneously, and the high-voltage direct-current contactor is in a closed working state; when the driving coil 610 is powered off, the push rod 630 moves vertically downwards under the action of the return spring 640 to return, and then the moving contact piece 120 and the two stationary contacts 110 are simultaneously disconnected, and the high-voltage direct-current contactor is in a disconnection working state.
In summary, according to the high-voltage direct-current contactor provided by the embodiment of the invention, the gas detection unit arranged on the inner wall of the ceramic cavity generates a corresponding electrical signal according to the air pressure change in the ceramic cavity, the circuit board arranged on the outer wall of the ceramic cavity receives the electrical signal, and the air pressure change in the ceramic cavity is monitored according to the electrical signal. Therefore, the gas detection unit is arranged in the ceramic cavity of the high-voltage direct-current contactor to monitor the change of the air pressure in the cavity in real time, so that whether the ceramic cavity leaks gas or not can be judged in time, and the reliability of arc extinction of the high-voltage direct-current contactor is further ensured.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. The meaning of "plurality" is two or more unless explicitly defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (7)

1. A high voltage direct current contactor, comprising:
the device comprises a ceramic cavity, a first contact piece and a second contact piece, wherein two static contacts and one movable contact piece which are arranged side by side are arranged in the ceramic cavity, the movable contact piece and the two static contacts are respectively arranged oppositely along the vertical direction, and protective gas is filled in the ceramic cavity;
the gas detection unit is arranged on the inner wall of the ceramic cavity and is used for generating a corresponding electric signal according to the change of the air pressure in the ceramic cavity;
the circuit board is arranged on the outer wall of the ceramic cavity and connected with the gas detection unit, and the circuit board is used for receiving the electric signals and monitoring the air pressure change in the ceramic cavity according to the electric signals.
2. The HVDC contactor of claim 1, wherein the ceramic cavity is perforated with a through hole, and wherein the HVDC contactor further comprises:
and one end of the connecting electrode is embedded in the through hole and is connected with the gas detection unit, and the other end of the connecting electrode is connected with the circuit board.
3. The high voltage direct current contactor according to claim 2,
one end of the connecting electrode is connected with the gas detection unit through the conductive slurry.
4. The high voltage direct current contactor according to claim 1,
the gas detection unit is a capacitive pressure sensor.
5. The high voltage direct current contactor according to claim 1,
the gas detection unit is a piezoresistive pressure sensor.
6. The high voltage direct current contactor according to claim 1, further comprising:
and the driving unit is arranged below the ceramic cavity and used for controlling the connection state of the movable contact piece and the two static contacts so as to adjust the working state of the high-voltage direct-current contactor.
7. The high voltage direct current contactor according to claim 6, characterized in that the drive unit comprises:
the driving coil is fixedly arranged below the ceramic cavity;
the movable iron core is movably arranged in a space surrounded by the driving coil;
the push rod is arranged along the vertical direction, the lower end of the push rod is arranged in the movable iron core, and the upper end of the push rod is connected with the movable contact piece;
the reset spring is sleeved outside the lower part of the push rod.
CN202211115622.XA 2022-09-14 2022-09-14 High voltage direct current contactor Pending CN115458365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211115622.XA CN115458365A (en) 2022-09-14 2022-09-14 High voltage direct current contactor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211115622.XA CN115458365A (en) 2022-09-14 2022-09-14 High voltage direct current contactor

Publications (1)

Publication Number Publication Date
CN115458365A true CN115458365A (en) 2022-12-09

Family

ID=84302457

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211115622.XA Pending CN115458365A (en) 2022-09-14 2022-09-14 High voltage direct current contactor

Country Status (1)

Country Link
CN (1) CN115458365A (en)

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