KR20120039273A - Monitoring system of sealed contactor - Google Patents

Abstract

PURPOSE: An electronics opening/closing device is provided to improve product reliability and safety by periodically measuring tightness without deformation or damage of an existing product. CONSTITUTION: A remote inspection device comprises a pressure sensor(410) and a signal transmission part(420). The remote inspection device is formed into a smart sensor shape. The pressure sensor collects gas pressure sensing data. The signal transmission part transmits and receives information as a wireless data form from a tag attached to a mobile object by using a wireless communications protocol including a radio frequency system. The pressure sensor measures pressure of SOHO gas in a confidential space. The signal transmission part offers gas pressure data measured in the pressure sensor to an external reader through the wireless communications protocol.

Description

Monitoring system of Sealed contactor

The present invention relates to an electronic switchgear, and more particularly to an electronic switchgear for monitoring the airtightness by measuring the pressure of the SOHO gas in the airtight space of the electronic switchgear.

Electronic switchgear that opens and closes DC power is installed between a battery and a DC power converter in an electric vehicle such as a hybrid car, a fuel cell car, a golf cart, and an electric forklift truck to convert DC power from a battery to DC power. Function to supply or shut off the device.

In addition, the electronic switchgear for opening and closing the DC power is installed between the DC generator and the inverter for converting the galvanic power into AC power of commercial frequency and voltage in an eco-friendly power generation system such as a solar power system and a wind power generation system. In addition, it also functions to supply or cut off DC power to the inverter.

The electronic opening and closing device may include an actuator having a fixed contact and a movable contact and driving an movable contact to enable the opening and closing control of the contact.

In particular, the electronic switchgear for opening and closing the DC power used in electric vehicles, when the movable contact is momentarily released from the fixed contact, that is, when the contact is off (arc) can be generated (arc) and the arc quickly Spaces in which contacts are arranged for extinguishing constitute a hermetic space and are to be filled with SOHO gas in the hermetic space.

Soho gas needs to be kept above a certain level in an airtight space in order to maintain its life as a certain level of electronic components and to maintain reliable function. Therefore, SOHO gas needs a technology for sealing.

The present invention provides an electronic switching device capable of measuring the air density of the space containing the arc extinguishing gas for extinguishing the arc generated when the contact of the electronic switching device off.

The present invention provides an electronic switchgear device capable of periodically measuring the airtightness of the airtight space without deformation or damage to the electronic switchgear device, thereby improving product reliability and safety.

Electronic switchgear according to an aspect of the present invention is an electronic switchgear device for switching to an external device, comprising a arcuating unit having a fixed contact point and a movable contact, and having an airtight space in which the movable contact is opened and closed, using an electrical signal It may include a remote monitoring unit for measuring the pressure of the airtight space of the drive unit and the extinguishing unit for controlling the opening and closing of the movable contact.

In addition, the remote monitoring unit may include a pressure sensor for measuring the gas pressure and a signal transmission unit for transmitting information on the measured gas pressure using a wireless communication protocol.

In addition, the signal transmission unit is made of a radio frequency identification tag, and transmits information to the radio tag reader.

The present invention can measure the airtightness by measuring the pressure in the airtight structure of the electronic switching device.

The present invention enables periodic airtightness measurement without deformation or damage to existing products of the electronic switchgear device, thereby contributing to improved product reliability and safety.

1 is a view showing an electronic switching device according to an embodiment of the present invention.
2a and 2b is a view showing the open and close state of the electronic switching device according to an embodiment of the present invention.
3 is a view showing an airtight space into which the arc extinguishing gas of the electronic switching device according to an embodiment of the present invention is injected.
4 is a view showing a remote monitor for measuring the airtightness of the electronic switchgear according to an embodiment of the present invention.
5 is a view showing a remote monitor disposed in the electronic switchgear according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a view showing an electronic switching device according to an embodiment of the present invention. Referring to FIG. 1, the electronic switching device 100 includes a extinguishing unit 110 and a driving unit 120.

The extinguishing unit 110 includes a fixed contact 111 and a movable contact 112, and includes an opening and closing structure of the contact so that switching to an external device connected to the electronic switching device 100 is performed.

The driver 120 includes an actuator to control the opening and closing of the contact using an electrical signal. The electronic switch device 100 typically switches an external device connected to the electronic switch device 100 by the vertical movement of the driving unit 120 through the actuator.

The driving unit 120 generates a magnetic force by an electrical signal to generate a driving force of the contact point 121, a fixed iron core 122 is fixedly disposed inside the excitation coil 121, a fixed iron core 122 It has a movable iron core 123 disposed to face to.

Between the excitation coil 121 and the fixed iron core 122 and the movable iron core 123 is provided a coil bobbin 124 recommended for the excitation coil 121, the vertical direction along the axial direction of the coil bobbin 124 The fixed iron core 122 and the movable iron core 123 are disposed. The fixed iron core 122 and the movable iron core 123 form a magnetic path through which magnetic flux density generated by the excitation coil 121 passes. The movable iron core 123 has a driving force to move up and down by the magnetic flux generated by the excitation coil 121.

Between the coil bobbin 124 and the fixed iron core 122 and the movable iron core 123 is made of a nonmagnetic material, the plunger is formed in a cylindrical shape that is open on the side of the arcuate portion 110, the bottom of the other side is blocked. A cap or cylinder 125.

The plunger cap or cylinder 125 has a form such as a container in which the fixed iron core 122 and the movable iron core 123 are accommodated, and the outer diameter of each of the fixed iron core 122 and the movable iron core 123 is a plunger cap 125. It is formed into a cylindrical shape having a diameter the same as the inner diameter in). The movable iron core 123 is movable in the axial direction of the plunger cap 125.

The moving range of the movable core 123 is determined between the joining position to be joined to the fixed core 122 and the bottom surface of the other side of the plunger cap 125 and the initial position falling. The joining force for joining the movable core 123 and the stationary iron core 122 is provided by a coil spring by the excitation coil 121, and the spring force in the direction in which the movable core 123 returns to the initial position is a return spring ( 126).

A insertion hole 127 through which the fixed iron core 122 is inserted is provided at the center of the driving unit 120, and the fixed iron core 122 is inserted into the insertion hole 127 to the driving unit 120. It is fixed.

A central portion of the driving unit 120 is provided with a movable iron core 123 that is approached and spaced apart from the fixed iron core 122. Inside the core bobbin 124 of the central portion may be provided with a guide for guiding the movement of the movable core (123).

In addition, the central portion of the fixed iron core 122 and the movable iron core 123 has a through hole 128 is provided with a shaft 130 connected through the arc-shaped unit 110 and the drive unit 120 in the axial direction. The shaft 130 penetrates in the axial direction through the through hole 128, and the shaft 130 has a movable contact 112 at the upper end and a movable iron core 123 at the lower end thereof. The vertical movement of the transfer to the movable contact (112).

A housing 114, which is formed in a box shape having a lower opening, is installed in a form above the driving unit 120. A terminal hole is provided at an upper portion of the housing 114, and a fixed contact 111 is provided through the terminal hole. And the fixed terminal 115 is inserted.

Inside the housing 114, a movable contact 112 is disposed at the bottom of the fixed contact 111 and has a space for contacting and separating with the fixed contact 111 for switching.

The lower portion of the movable contact 112 is provided with a contact spring 113 to have an elastic force when the movable contact 112 is in contact with the fixed contact 111. Through the contact spring 113, the movable contact 112 can be maintained in contact with the fixed contact 111 at a predetermined pressure or more. In addition, the contact spring 113 reduces the moving speed of the movable iron core 123 and the shaft 130 when the movable contact 112 is separated from the fixed contact 111, so that the movable core 123 is the plunger cap 125. ), The impact force can be reduced to prevent noise and vibration.

2 is a view showing the opening and closing state of the electronic switchgear according to an embodiment of the present invention. Referring to FIG. 2, (a) of FIG. 2 shows a closed state of the electronic switchgear, and (b) shows an opened state of the electronic switchgear.

According to the structure described above with reference to FIG. 1, when energizing the exciting coil 121, magnetic flux is generated around the exciting coil 121. By the magnetic flux, the fixed core 122 and the movable core 123 become different polarities, and the movable core 123 is attracted to the fixed core 122 so that the movable core 123 and the fixed core 122 contact each other. do. As such, when the movable iron core 123 is in the joining position with the fixed iron core 122, the fixed contact 111 and the movable contact 112 are in contact with each other. When the stationary contact 111 and the movable contact 112 is in contact with each other to supply power to the external device, this state is a closed state of Figure 2 (a).

In addition, when the excitation coil 121 is shorted, the magnetic force generation of the excitation coil 121 is stopped and the driving force of the movable iron core 123 is lost, so that the movable core 123 is initially initialized by the elastic force of the return spring 126. Return to position As the movable iron core 123 is returned to the initial position, the shaft 130 is moved, and the movable contact 112 is separated from the fixed contact 111.

At this time, the return spring 126 is received and installed in the spring receiving groove 201 installed in the fixed iron core 122, the movable core 123 is closed (when moved to the bonded position) of Figure 2 (a) Since the return spring 126 is compressed and the entire return spring 126 is accommodated in the spring receiving groove 201, the return spring 126 does not interfere with the engagement of the fixed core 122 by the movable core 123. Do not. When the movable iron core 123 returns to the initial position, the power supply to the external device is stopped, and this state is the open state of FIG.

The electronic switching device switches the external device by repeatedly performing the closed state of FIG. 2A and the open state of FIG. 2B.

3 is a view showing an airtight space into which the arc extinguishing gas of the electronic switching device according to an embodiment of the present invention is injected.

Referring to FIG. 3, the housing 110, the connecting body 301, the upper plate 302, and the arc-out part 110, the fixed iron core 122, and the movable iron core 123 of the electronic switching device are housed in an airtight space. The plunger cap 125 is installed and hermetically bonded to form an airtight space surrounded by the housing 114, the connecting body 301, and the plunger cap 125.

The housing 114 is formed in a box shape from a heat resistant material such as ceramic or the like. An opening 310 is formed below the housing 114. In addition, two terminal holes 321 and 322 are formed in the upper portion 320 of the housing 114.

The connecting body 301 is formed of a metal material or the like and is hermetically bonded to the opening 310 of the housing 114 to form the opening 330 in the lower part of the connecting body 301, and the connecting body through a joining method such as welding. The opening 330 of the 301 and the upper plate 302 are hermetically bonded.

The housing 114 forms an airtight space 340 for accommodating the fixed contact 111 and the movable contact 112 by the airtight bonding of the connecting body 301 and the top plate 302. The hermetic space 340 is sealed with an insulating gas composed mainly of hydrogen.

Each of the fixed terminals 350 in the airtight space 340 is formed in a cylindrical shape with a conductor such as a copper material, and has a sunshade so as to have a fixed contact at the lower end and an external device at the upper end thereof. The movable contact 360 is formed on a flat plate with a conductor such as a copper-based material and a movable contact is formed on the upper surface. The movable contact is integrally formed with the movable contact 360.

4 is a view showing a remote monitor for measuring the airtightness of the electronic switchgear according to an embodiment of the present invention. Referring to FIG. 4, the remote monitor may include a pressure sensor 410 and a signal transmitter 420.

The remote monitor may be implemented in the form of a smart sensor, the pressure sensor 410 collects and stores the gas pressure sensing data, the signal transmitter 420 is moved using a wireless communication protocol such as a radio frequency identification (RFID) system Information can be transmitted and received in the form of wireless data from a tag attached to an object.

The smart sensor has advantages in terms of excellent data processing ability, determination function, memory function, communication function, etc., which is advantageous in being utilized as a remote monitor of an electronic switchgear according to an embodiment of the present invention.

An embodiment of the present invention shown in FIG. 4 uses a smart sensor including a pressure transmitter and a signal transmission unit using a radio frequency identification (RFID) system, and details of the pressure sensor or the radio frequency identification itself are not described herein. .

In FIG. 4, the pressure sensor and the signal transmitter are displayed in one main body of the remote monitor, but the pressure sensor and the signal transmitter do not necessarily need to be implemented in one main body. It will be possible and will correspond to one embodiment of the invention.

The pressure of the SOHO gas in the airtight space is measured using the pressure sensor 410, and the measured gas pressure data is provided to an external reader through the wireless communication protocol of the signal transmission unit 420, so that the SOHO gas pressure of the electronic switchgear device is reduced. The degree can be measured.

The pressure of the SOHO gas is compared with the SOHO gas injected at the time of manufacture to calculate the airtightness of the electronic switchgear in the current state to confirm the effectiveness and reliability of the function of the electronic switchgear. The service life of the device and whether it can be replaced can be determined.

5 is a view showing a remote monitor disposed in the electronic switchgear according to an embodiment of the present invention.

The electronic switchgear shown in FIG. 5 is basically the same in components and driving methods as the electronic switchgear shown in FIG. 1, and includes an arc extinguishing part and a driving part.

Of course, it can also be utilized in all electronic switchgear having a switchgear structure of the contact is made to the external device.

The indicated portions 501, 502, 503 of FIG. 5 show the locations where the remote monitor can be placed in the case of an electronic switchgear having the basic structure of FIG. 1 according to an embodiment of the invention.

The arc extinguishing part may be disposed at the upper end 501, the lower end 502, the inside of the cylinder 503, etc., in consideration of the arc effect since the arc is generated when the contact is opened or closed.

Of course, the remote monitor can be selected in various positions that can be arranged according to the change of the structure of the electronic switchgear, the change of the airtight space, and can transmit the pressure information to the outside through the wireless communication protocol to measure the gas pressure It can be placed anywhere it can.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the scope of the present invention should not be limited to the above-described examples, but should be construed to include various embodiments within the scope equivalent to those described in the claims.

410 pressure sensor
420 signal transmitter

Claims (3)

In the electronic switch to switch to an external device,
A fire extinguishing unit having a stationary contact and a movable contact and having an airtight space in which the movable contact is opened and closed;
A driving unit controlling opening and closing of the movable contact using an electrical signal; And
And a remote monitoring unit for measuring and transmitting the pressure in the airtight space of the extinguishing unit. The method of claim 1, wherein the remote monitoring unit
A pressure sensor for measuring gas pressure; And
And a signal transmission unit for transmitting the information on the measured gas pressure by using a wireless communication protocol. The method of claim 2, wherein the signal transmission unit
An electronic switchgear that consists of a RFID tag and monitors the confidentiality of transmitting information to a RFID tag reader.

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