CN217426628U - Vacuum contactor - Google Patents

Abstract

The utility model relates to a vacuum contactor, which comprises an electromagnetic coil, an armature and a vacuum switch tube, wherein a main contact is arranged in the vacuum switch tube, the electromagnetic coil is magnetically coupled with the armature, and the armature is in transmission connection with the main contact; the two ends of the vacuum switch tube are connected with a main loop input terminal and a main loop output terminal; the vacuum contactor is also provided with a detection circuit and an electric connector; the detection circuit is connected with the electric connector, and the electric connector is used for connecting a main loop input terminal and a main loop output terminal at two ends of the vacuum switch tube so as to detect the voltage at two ends of the vacuum switch tube. Due to the arrangement of the electric connector, the electric connector can be connected to two ends of the vacuum switch tube when needed so as to detect the vacuum switch tube, and thus the self parameters of the vacuum contactor can be measured.

Description

Vacuum contactor

Technical Field

The present invention relates generally to the field of electrical control. More particularly, the present invention relates to a vacuum contactor.

Background

The vacuum contactor is an electrical switch suitable for an alternating current distribution system, and is widely applied to industrial and mining enterprises.

A conventional vacuum contactor generally includes a vacuum switch for passing a normal operating current and cutting off the operating current, and an operating mechanism, and is capable of reliably extinguishing an arc when cutting off the operating current. The operating mechanism comprises an electromagnetic coil with an iron core, an armature, a brake separating spring and the like. When the electromagnetic coil is electrified, the armature is attracted to enable the main contact of the vacuum switch to be connected, and after the electromagnetic coil is powered off, the main contact of the vacuum switch is disconnected due to the action of the opening spring. The vacuum switch is arranged in the vacuum arc-extinguishing chamber, and the vacuum arc-extinguishing chamber can adopt a vacuum switch tube. The vacuum switch tube can be composed of a sealing cover, a metal corrugated tube, a ceramic tube and the like.

In the use process of the traditional vacuum contactor, due to the problems of mechanical abrasion, spring performance reduction, electric element parameter change and the like, the pull-in reaction speed is slowed down, the contact resistance of a contact is increased, and the consistency of three phases of the contactor which are simultaneously conducted is reduced. These performance degradations can directly impact the proper operation of the associated equipment. Therefore, the performance of the contactor needs to be regularly detected during the use process of the contactor so as to eliminate hidden dangers.

However, the conventional vacuum contactor cannot perform the detection of its own performance.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vacuum contactor for solve vacuum contactor at least and can't carry out the problem that detects to self performance.

In order to solve the above problem, the utility model provides a following technical scheme: a vacuum contactor comprises an electromagnetic coil, an armature and a vacuum switch tube, wherein a main contact is arranged in the vacuum switch tube, the electromagnetic coil is magnetically coupled with the armature, and the armature is in transmission connection with the main contact; the two ends of the vacuum switch tube are connected with a main loop input terminal and a main loop output terminal; the vacuum contactor is also provided with a detection circuit and an electric connector; the detection circuit is connected with the electric connector, and the electric connector is used for connecting a main loop input terminal and a main loop output terminal at two ends of the vacuum switch tube so as to detect the voltage at two ends of the vacuum switch tube.

In one embodiment, the detection circuit is connected to the electrical connector by a cable.

In one embodiment, the vacuum contactor further comprises a storage chamber, and the cable and the electric connector are placed in the storage chamber.

In one embodiment, the electrical connector is an alligator clip.

In one embodiment, the detection circuit includes a voltage sampling circuit to collect the voltage and voltage variation across the vacuum switching tube.

In one embodiment, the vacuum contactor further comprises a single chip microcomputer, and the single chip microcomputer is connected with the voltage sampling circuit to measure the pull-in time of the main contact according to the voltage and the voltage change.

In one embodiment, the voltage sampling circuit includes a pull-up resistor, one end of the pull-up resistor is connected to a dc power supply, the other end of the pull-up resistor is connected to the single chip microcomputer, and the pull-up resistor is configured to be connected to the first end of the vacuum switch tube through the electrical connector, and the second end of the vacuum switch tube is grounded.

In one embodiment, the vacuum contactor is a three-phase vacuum contactor, and comprises three vacuum switch tubes, wherein each vacuum switch tube is correspondingly provided with a cable and an electric connector.

In one embodiment, the single chip microcomputer is further connected with a coil temperature sensor and a vacuum switch tube temperature sensor, the coil temperature sensor is used for acquiring the temperature of the electromagnetic coil, and the vacuum switch tube temperature sensor is used for acquiring the temperature of the vacuum switch tube.

In one embodiment, the single chip microcomputer is further connected with a communication circuit for outputting the test result.

The utility model discloses a vacuum contactor, self configured the electric connector, can be connected to the both ends of vacuum switch tube when needing to detect the vacuum switch tube. For example, the voltage across the vacuum interrupter may be sensed to obtain further information. Based on this, the utility model discloses a vacuum contactor can realize the measurement to self parameter.

Further, the containing bin is arranged in the vacuum contactor, so that the electric connector and the cable can be contained when measurement is not needed, and the normal use of the vacuum contactor cannot be influenced.

Further, according to the voltage at the two ends of the vacuum switch tube and the voltage change information, the pull-in reaction speed of the main contact of the vacuum switch tube, the pull-in time difference of the three-phase main contact and the like can be further detected, so that the pull-in reaction speed of the vacuum contactor, the contact resistance of the contact and the consistency of the simultaneous conduction of the three phases of the contactor can be judged.

Furthermore, the measurement result can be fed back to the upper computer through the communication circuit, for example, the upper computer can judge the measurement result to judge whether the vacuum contactor meets the requirements or not; and for example, the singlechip can also alarm according to the measurement result.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. In the accompanying drawings, which are meant to be exemplary and not limiting, several embodiments of the invention are shown and indicated by the same or corresponding reference numerals, wherein:

fig. 1 is a schematic view of a vacuum contactor according to the prior art;

fig. 2 is a schematic plan view of a vacuum contactor according to an embodiment of the present invention;

fig. 3 is a schematic block circuit diagram of a vacuum contactor according to an embodiment of the present invention; and

fig. 4 is a schematic circuit diagram of the pull-in time detection circuit 303 according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it should be understood by those skilled in the art that the embodiments described below are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 schematically shows a schematic view of a vacuum contactor according to the prior art. As shown in fig. 1, the vacuum contactor includes an electromagnetic coil L1, an armature X1, a transmission mechanism C1, a tripping spring T1 and a vacuum switch tube Z1, and a main contact J1 is arranged in the vacuum switch tube Z1. The main contact J1 is used for connecting and disconnecting the main circuit, namely the upper copper bar N2 and the lower copper bar N1, and the upper copper bar N2 and the lower copper bar N1 are used for connecting the main circuit. The electromagnetic coil L1 is magnetically coupled with the armature X1, and the opening spring T1 is connected with the armature X1 to resist the magnetic force generated by the electromagnetic coil L1 on the armature X1. When the electromagnetic coil L1 is electrified, the armature X1 is attracted, and the armature X1 drives the main contact J1 to be attracted through the transmission mechanism C1, so that the main circuit is switched on. When the electromagnetic coil L1 loses power, the armature X1 drives the main contact J1 to break through the transmission mechanism C1 under the action of the opening spring T1.

The prior art has a problem in that the vacuum contactor is liable to cause various problems in use, and cannot detect its own performance. In order to perform the detection to obtain the relevant performance parameters, the test needs to be performed by means of a special instrument. The method needs a worker to carry a special instrument to a field for testing, and the special instrument has large volume and weight and is inconvenient to carry. Based on this, the utility model discloses improved current vacuum switch tube. The following description is made with reference to the accompanying drawings.

Fig. 2 schematically illustrates a vacuum contactor according to an embodiment of the present invention. As shown in fig. 1, a vacuum contactor comprises (not shown) an electromagnetic coil L1, an armature X1 and a vacuum switch tube Z1, wherein a main contact J1 is arranged in the vacuum switch tube Z1, the electromagnetic coil L1 is magnetically coupled with an armature X1, and the armature X1 is in transmission connection with the main contact J1. This part of the structure is the same as that of fig. 1 and thus will not be described again.

As shown in fig. 2, the vacuum switch tube Z1 includes two terminals, which are referred to as a first terminal and a second terminal in the present invention, wherein the first terminal is connected to the main circuit input terminal 102, and the second terminal is connected to the main circuit output terminal 101, or the first terminal is connected to the main circuit output terminal 101, and the second terminal is connected to the main circuit input terminal 102. The vacuum contactor is also provided with a detection circuit and an electric connector, wherein the detection circuit is connected with the electric connector, and the electric connector can be connected with a main loop input terminal and a main loop output terminal at two ends of the vacuum switch tube so as to detect the voltage at two ends of the vacuum switch tube Z1.

By way of example, the vacuum contactor in the present embodiment is a three-phase vacuum contactor, that is, three vacuum switching tubes are provided in the vacuum contactor, corresponding to the a-phase, the b-phase, and the c-phase, respectively. And two electric connectors are arranged on each phase of vacuum switch tube and are respectively connected with two ends of a certain phase of vacuum switch tube. For example, for the vacuum switch tube of the a phase, there are two corresponding electrical connectors, one of which is connected to the first end of the vacuum switch tube of the a phase, and the other of which is connected to the second end of the vacuum switch tube. Similarly, for the vacuum switch tube of the b phase and the vacuum switch tube of the c phase, each vacuum switch tube corresponds to two electric connectors.

As shown in fig. 2, two electrical connectors are required for each vacuum interrupter, and in another embodiment, only one electrical connector may be required for each vacuum interrupter, i.e., one electrical connector is omitted from the embodiment shown in fig. 2; for example, one end of the vacuum interrupter Z1 may be coupled directly into the detection circuit. For example, for the vacuum switch tube of the phase a, the first end of the vacuum switch tube is connected with an electric connector, and the second end of the vacuum switch tube is directly connected into the detection circuit. Similarly, for the vacuum switch tube of the phase b and the vacuum switch tube of the phase c, each vacuum switch tube corresponds to one electric connector.

In one application scenario, as shown in fig. 2, the electrical connector may employ an alligator clip 103. For ease of operation, a cable may also be provided between the detection circuit and the electrical connector. In another application scenario, the electrical connector may not need to be provided with a cable, for example, the electrical connector may be disposed near one end of the vacuum interrupter Z1, so that the cable may be omitted.

Further, as shown in the embodiment of fig. 2, the cable and the crocodile clip 103 are arranged in the vacuum contactor, and in order to avoid the cable and the crocodile clip 103 from being influenced when the vacuum contactor works normally, the cable and the crocodile clip 103 need to be stored. By way of example, a storage bin 104 is provided as in fig. 2. During normal operation of the vacuum contactor, the cable and alligator clip 103 may be received into the receiving compartment 14. When the maintainer needs to overhaul or test the vacuum contactor, the storage bin 104 can be opened, the cable and the crocodile clip 103 are taken out, and then the crocodile clip 103 corresponding to the vacuum switch tube is clipped at two ends of the vacuum switch tube. For this reason, the vacuum switch tube and the alligator clip (or the cable) may be marked, for example, with red for phase a, yellow for phase b, and blue for phase c, and the vacuum switch tube, the alligator clip, and the cable of phase a are marked with red, the vacuum switch tube, the alligator clip, and the cable of phase b are marked with yellow, and the vacuum switch tube, the alligator clip, and the cable of phase c are marked with blue. In one embodiment, a compartment cover may be provided for the storage compartment 104 to press against the cable and alligator clip 103 to prevent the cable and alligator clip 103 from being exposed from the storage compartment 104.

In conclusion, the accommodating bin is arranged in the vacuum contactor, so that the electric connector and the cable can be accommodated when the measurement is not needed, the normal use of the vacuum contactor is not influenced, the complete isolation of the main loop and the control circuit is realized, and the safety of the equipment is improved.

As shown in fig. 2, in the vacuum contactor, three vacuum switching tubes Z1 are positioned at an upper portion and spaced apart in the left-right direction; the receiving compartment 104 is positioned at a lower portion so that the space inside the vacuum contactor can be fully utilized. Also shown in fig. 2 is a control circuit mounting bin 105. The control circuit mounting chamber 105 mounts a control circuit, which will be described below.

Fig. 3 schematically illustrates a schematic block diagram of a control circuit of a vacuum contactor according to an embodiment of the present invention. As shown in fig. 3, the main carrier of the control circuit is a circuit board 310 (for example, a PCB board), and the circuit board 310 is provided with a single chip 301, a power circuit 304, a coil driving circuit 302, a pull-in time detection circuit 303 and a communication circuit 307. Also shown in fig. 3 are solenoid L1, coil temperature sensor 305, vacuum interrupter temperature sensor 306 and electrical connector 308, outside of circuit board 310.

The single chip microcomputer 301 is connected with a coil driving circuit 302, and the coil driving circuit 302 is connected with an electromagnetic coil L1. The single chip microcomputer 301 can send out a control signal, and the coil driving circuit 302 amplifies the control signal and provides the amplified control signal to the electromagnetic coil L1, so that power on and power off of the electromagnetic coil L1 are controlled. The power circuit 304 can adopt a 220V to 24V power conversion circuit, utilize a 220V high-voltage attracting electromagnetic coil and utilize a 24V low-voltage attracting state to keep the electromagnetic coil attracting state, thereby achieving the purpose of energy saving, wherein the power circuit can also comprise a 24V to 5V (or 3.3V) circuit, thereby providing power VCC for chips and sensors such as the singlechip 301.

The single chip microcomputer 301 is further connected with a coil temperature sensor 305 and a vacuum switching tube temperature sensor 306. As the name suggests, the coil temperature sensor 305 is used to acquire the temperature of the electromagnetic coil L1, and the vacuum interrupter temperature sensor 306 is used to acquire the temperature of the vacuum interrupter Z1. In view of the fact that there may be a plurality of vacuum interrupter Z1, there may also be a plurality of corresponding vacuum interrupter temperature sensors 306. The single chip microcomputer 301 may be an 8-bit single chip microcomputer or a 16-bit single chip microcomputer, and preferably, a single chip microcomputer with an AD conversion function may be selected because a temperature sensor needs to be connected. The coil temperature sensor 305 and the vacuum interrupter temperature sensor 306 may be selected from a contact temperature sensor (e.g., a thermistor temperature sensor or a fiber optic temperature sensor) or a non-contact temperature sensor (e.g., an infrared temperature sensor).

The coil temperature sensor 305 and the vacuum switch tube temperature sensor 306 can be used for monitoring the temperature of the electromagnetic coil L1 and the vacuum switch tube Z1 in real time and giving an alarm when abnormal temperature is monitored, for example, the single chip microcomputer is connected with an audible and visual alarm which gives an alarm based on the control of the single chip microcomputer; for another example, the single chip microcomputer can send alarm information to a remote end by using the communication circuit 307 to realize alarm. In one embodiment, the communication circuit may be a serial communication circuit, such as a 485 communication circuit. By using the communication circuit, the information collected by the electromagnetic coil temperature, the vacuum switch tube temperature and the actuation time detection circuit 303 which can be collected by the singlechip 301 is sent to a far end. In another embodiment, the communication circuit may also be a wireless communication circuit, such as a GPRS communication circuit.

The pull-in time detection circuit 303 may be configured to collect a voltage on the electrical connector 308, and according to the foregoing, the electrical connector 308 may be connected to a certain phase of vacuum switch tube, so that the pull-in time detection circuit 303 may detect voltages at two ends of the certain phase of vacuum switch tube, and may further detect the pull-in time of the main contact of the vacuum switch tube based on the voltage information.

For example, the pull-in time detection circuit 303 may be provided with three sets, each set being used for testing a corresponding vacuum switch tube. Fig. 4 schematically shows a circuit schematic diagram of the pull-in time detection circuit 303 according to an embodiment of the present invention. In one embodiment, the detection circuit includes a voltage sampling circuit to collect the voltage and voltage variation across the vacuum switching tube. The single chip microcomputer is connected with the voltage sampling circuit to measure the pull-in time of the main contact according to the voltage and the voltage change. The voltage sampling circuit comprises a pull-up resistor R1, one end of the pull-up resistor R1 is connected with a direct current power supply VCC, the other end of the pull-up resistor R1 is connected with the single chip microcomputer 301, and is used for being connected with a first end (such as a main loop output terminal 101) of the vacuum switch tube through the electric connector 103, and a second end (such as a main loop input terminal 102) of the vacuum switch tube can be grounded.

The detection circuit 303 as shown in fig. 4 may be used to detect a vacuum interrupter for a certain phase. By way of example, the detection circuit 303 is capable of detecting the voltage between the main circuit output terminal 101 and the main circuit input terminal 102 (i.e., the voltage across the vacuum interrupter Z1). The circuit principle comprises: when the main contact in the vacuum switch tube Z1 is not closed, the voltage acquired by the singlechip 301 is equal to VCC; when the main contact in the vacuum switch tube Z1 is closed, the voltage collected by the single chip microcomputer 301 is determined by the resistor R1 and the pull-in resistor of the vacuum switch tube Z1. For example, after the main contact in the vacuum switch tube Z1 is closed, the voltage collected by the single chip microcomputer 301 may be reduced according to the principle of resistance voltage division. On one hand, because the main contact of the vacuum switch tube Z1 needs a certain time to be closed, the single chip 301 can acquire the change process and the duration of the port voltage, for example, the duration from the time when the single chip 301 sends the pull-in command to the time when the vacuum switch tube Z1 finishes the pull-in is recorded, so as to obtain the pull-in speed of the vacuum switch tube. On the other hand, the main contact in the vacuum switch tube Z1 is worn out, and when the main contact is worn out differently, the contact resistance of the main contact is also different, so that the pull-in resistance of different vacuum switch tubes Z1 is also different. Therefore, for the vacuum switch tubes of the phases a, b and c, the single chip microcomputer 301 can also acquire different voltages. In addition, the single chip microcomputer 301 can also acquire the information of the suction times of the vacuum switch tube Z1.

In conclusion, the voltage and voltage change at two ends of the vacuum switch tube Z1 can be measured by utilizing the analog quantity acquisition function of the singlechip, which is equivalent to the resistance and resistance change of the vacuum switch tube Z1. The infinite resistance represents that the vacuum switch tube Z1 is not closed, and the instant reduction of the resistance represents that the vacuum switch tube Z1 is closed. Based on the voltage and the voltage change acquired by the single chip microcomputer 301, the single chip microcomputer can acquire information such as the suction speed and the abrasion condition of each phase of vacuum switch tube. In one embodiment, the single chip 301 may further send the test result to a remote end through the communication circuit 307. The far end can be an upper computer, namely, the communication circuit can feed back the measurement result to the upper computer, so that the upper computer can judge the measurement result to judge whether the vacuum contactor meets the requirements or not.

Generally speaking, because the utility model discloses vacuum contactor has configured the electric connector, can be connected to the both ends of vacuum switch pipe when needing to detect the vacuum switch pipe. For example, the voltage across the vacuum interrupter may be sensed to obtain further information. Therefore the utility model discloses a vacuum contactor can realize the measurement to self parameter, moreover according to the voltage and the voltage variation information at vacuum switch tube both ends, can further detect the actuation reaction rate of the main contact of vacuum switch tube to and the circumstances such as the actuation time difference of the main contact of three-phase, thereby judge vacuum contactor's actuation reaction rate, the contact resistance of contact, and the uniformity that the contactor three-phase switched on simultaneously.

In the above description of the present specification, the terms "fixed," "mounted," "connected," or "connected," and the like, are to be construed broadly unless otherwise expressly specified or limited. For example, with the term "coupled", it can be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship. Therefore, unless otherwise explicitly defined in the specification, the specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

From the above description of the present specification, those skilled in the art will also appreciate that the terms "first" or "second", etc. used in the present specification to refer to a number or ordinal number are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present specification, "plurality" means at least two, for example, two, three or more, and the like, unless explicitly defined otherwise.

While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Numerous modifications, changes, and substitutions will occur to those skilled in the art without departing from the spirit and scope of the present invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The following claims are intended to define the scope of the invention and, accordingly, to cover module compositions, equivalents, or alternatives falling within the scope of the claims.

Claims (10)

1. A vacuum contactor is characterized by comprising an electromagnetic coil, an armature and a vacuum switch tube, wherein a main contact is arranged in the vacuum switch tube, the electromagnetic coil is magnetically coupled with the armature, and the armature is in transmission connection with the main contact; the two ends of the vacuum switch tube are connected with a main loop input terminal and a main loop output terminal;

the vacuum contactor is also provided with a detection circuit and an electric connector; the detection circuit is connected with the electric connector, and the electric connector is used for connecting a main loop input terminal and a main loop output terminal at two ends of the vacuum switch tube so as to detect the voltage at two ends of the vacuum switch tube.

2. A vacuum contactor as claimed in claim 1, wherein said detection circuit is connected to said electrical connector by a cable.

3. The vacuum contactor as claimed in claim 2, wherein a storage compartment is further provided in the vacuum contactor, and the cable and the electrical connector are placed in the storage compartment.

4. The vacuum contactor as claimed in claim 1, wherein said electrical connector is an alligator clip.

5. A vacuum contactor as claimed in claim 1, wherein said detection circuit comprises a voltage sampling circuit to collect the voltage and voltage variations across said vacuum switching tube.

6. The vacuum contactor as claimed in claim 5, further comprising a single chip microcomputer connected to the voltage sampling circuit for measuring a main contact pull-in time according to the voltage and the voltage variation.

7. The vacuum contactor as claimed in claim 6, wherein the voltage sampling circuit comprises a pull-up resistor, one end of the pull-up resistor is connected to a dc power source, the other end of the pull-up resistor is connected to the single chip microcomputer, and is configured to be connected to the first end of the vacuum switch tube through the electrical connector, and the second end of the vacuum switch tube is grounded.

8. The vacuum contactor as claimed in claim 6, wherein the single chip is further connected to a coil temperature sensor and a vacuum switch tube temperature sensor, the coil temperature sensor is used for acquiring the temperature of the electromagnetic coil, and the search vacuum switch tube temperature sensor is used for acquiring the temperature of the vacuum switch tube.

9. The vacuum contactor as claimed in claim 6, wherein the single chip is further connected with a communication circuit for outputting a test result.

10. A vacuum contactor as claimed in any of claims 2 to 9, wherein the vacuum contactor is a three-phase vacuum contactor comprising three vacuum switching tubes, each vacuum switching tube being provided with a cable and an electrical connector.

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