WO2006008781A1 - 接点開閉器 - Google Patents
接点開閉器 Download PDFInfo
- Publication number
- WO2006008781A1 WO2006008781A1 PCT/JP2004/007579 JP2004007579W WO2006008781A1 WO 2006008781 A1 WO2006008781 A1 WO 2006008781A1 JP 2004007579 W JP2004007579 W JP 2004007579W WO 2006008781 A1 WO2006008781 A1 WO 2006008781A1
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- WO
- WIPO (PCT)
- Prior art keywords
- contact
- contacts
- movable
- fixed
- contact switch
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H50/00—Details of electromagnetic relays
- H01H50/54—Contact arrangements
- H01H50/546—Contact arrangements for contactors having bridging contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H51/00—Electromagnetic relays
- H01H51/02—Non-polarised relays
- H01H51/20—Non-polarised relays with two or more independent armatures
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/40—Multiple main contacts for the purpose of dividing the current through, or potential drop along, the arc
Definitions
- the present invention relates to a contact switch for closing and opening a power source and a load.
- a movable contact As a contact switch that prevents contact welding caused by arc energy when an overcurrent such as short-circuit current flows in the circuit and the contact is separated by the electromagnetic repulsive force, a movable contact based on the excitation and demagnetization of the electromagnet By opening and closing the contact between the first state and the second state, the movable contact provided on the movable contact and the fixed contact placed opposite to the movable contact are contacted and opened. In the second state where the movable contact and the fixed contact are in contact with each other, an overcurrent flows through the circuit, and the movable contact and the fixed contact are separated by the electromagnetic repulsive force due to the overcurrent. Some have a holding mechanism that holds the movable contact in its third state when it changes to the third state.
- the contact switch includes an opening mechanism for forcibly returning the movable contact held in the third state by the holding mechanism from the third state to the first state.
- Patent Document 1 Japanese Patent Laid-Open No. 2 0 0 0-2 6 0 2 8 7
- a contact switch as described above called an electromagnetic contactor has a structure in which at least three normally open movable contacts are supported by a single holder (crossbar). Close the main circuit 3 phase to operate the load such as motor, and open the main circuit 3 phase to stop the load.
- Wear welding is a method in which the contact surface is mechanically and electrically damaged when the movable contact and the fixed contact are closed or opened in the state where voltage is applied to the three main phases of the contact switch, and wear gradually.
- the welding is caused by the contact point becoming smaller.
- the contact spring is compressed after the movable contact and fixed contact come into contact, and the amount of contact overtravel that presses the contact decreases.
- the power to hold down will also weaken. For this reason, the movable contact and the fixed contact are repeatedly minutely separated and re-contacted, and the contact surface is melted and welded by the arc generated at this time.
- Wear welding inherently increases the probability of welding as the contact surface wears, but it also affects factors such as 3 ⁇ 4-point switch product variation, switching frequency, ambient environment, and installation conditions. Therefore, it may occur even if the contact wear is small. Also, unlike short-circuit welding, the circuit breaker does not operate even if a circuit breaker is installed on the power distribution system of the contact switch as long as the energizing current is within the normal range, so the circuit is opened by the circuit breaker. I can't do that either. Therefore, even if the main circuit is opened by cutting off the applied voltage of the electromagnetic coil of the contact switch, the main circuit remains energized due to contact welding, and the motor and other equipment cannot be stopped. There was a problem.
- the present invention has been made in view of the above, and is unlikely to cause wear welding of contacts.
- a plurality of first movable contacts provided with first and second movable contacts at both ends, the movable contacts, and a plurality of pressing the movable contacts
- a first electromagnetic actuator that supports the contact spring and simultaneously activates the plurality of first movable contacts, the first switchgear housed in the housing, and the third and fourth movable at both ends
- a plurality of second movable contacts provided with contact points, a second contact that supports the movable contacts, and a plurality of contact springs that press the movable contacts, and operates the plurality of second movable contacts simultaneously.
- a second switching device housed in a housing, and one end having a fixed contact that contacts the first and fourth movable contacts, and the other end is an external connection end.
- a plurality of first and second fixed contacts fixed to the housing, and the second movable contact at one end Has a fixed contact point contacting or away from, having said third contact with the movable contact ⁇ fixed contacts spaced apart at the other end, and a, a plurality of relay contacts fixed on the housing.
- the circuit is operated by the other switchgear.
- the circuit can be opened and the safety function is not impaired by a single failure.
- the circuit is opened and closed by two movable contacts, each with two movable contacts, with four points. Since the circuit is opened, the arc voltage rises quickly and the arc is extinguished quickly, melting of the contact due to the end is reduced and contact welding is difficult to occur.
- the relay contact since the relay contact is housed in the housing, it is not exposed to the outside, and the risk of leakage is halved compared to the case of connecting two contact switches as in the past. In addition, the man-hours required for installation on the control panel, etc. are halved.
- the contact switch according to the next invention is characterized in that the first and second movable contacts are normally open movable contacts. According to the present invention, the contact switch can be used for main circuit switching of a load such as a three-phase AC motor.
- the first and second movable contacts, the first and second fixed contacts, and the relay contact are arranged linearly in the casing. It is characterized by.
- the first and second movable contacts are connected in a straight line via the relay contact, so that the space saving equivalent to arranging the two contact switches in close contact is achieved. It can be carried out.
- the casing includes a mounting base for accommodating the first and second electromagnetic actuators, the first and second movable contacts, the first and second And a case that accommodates the fixed contact and relay contact of 2 and covers the mounting base.
- the present invention when changing the control voltage of the electromagnetic actuator, it is not necessary to replace the entire contact switch, and it is easily changed by replacing the mounting base that houses the electromagnetic actuator. be able to.
- the mounting base is provided with at least one of a mounting groove or a mounting hole.
- the case has an opening on the front side. It is provided and the force bar which covers this opening part is attached.
- each contact can be visually inspected, and each contact can be replaced with a new one as necessary.
- the first and second movable contacts are pressed by a spring receiver provided with a tapered portion or an arc portion around the contact surface with the movable contact. And supported by the first and second electromagnetic actuators, and at a position closer to the cover than the first and second fixed contacts.
- the movable contact can be replaced by removing the cover.
- the movable contact with worn contact can be replaced with a new one at regular intervals. Safety can be maintained.
- one set of the plurality of first and second movable contacts is a normally closed movable contact, and the other set is a normally open movable contact
- the circuit including the normally closed movable contact has a gap between the contacts of a predetermined value or more. It is characterized by having an open state.
- the circuit including the normally closed movable contact is a contact greater than a predetermined value. If the circuit including the normally closed movable contact is open even when the electromagnetic actuator is de-energized, one of the contacts is welded. .
- a circuit including a normally closed movable contact can detect contact welding of a normally open movable contact.
- a pedestal provided with a pair of grooves is formed in a substantially central portion of the case, and a pair of protrusions formed on the relay contactor is formed in the pair of grooves. It is characterized by an interference fit.
- the relay contact is fixed on the pedestal without any force S, and there is no need for bonding or screwing.
- the structure of the manufacturing mold for manufacturing the case is relatively simple. The case can be manufactured cheaply.
- the relay contact is sandwiched and fixed between the pedestal and a protrusion provided on the cover.
- the relay contact is firmly fixed on the pedestal and does not come off the case.
- the first and second movable contacts and the fixed contact that contacts and separates from the first and second movable contacts, and the third and fourth movable contacts and the fixed that contacts and separates from the third and fourth movable contacts. It is characterized in that the size of at least one of the movable contact and the fixed contact is different from the contact.
- the present invention by increasing the one of the contact points of the first and second switchgears, it is difficult to weld the large contact point. Therefore, the first and second switchgears are prevented from being welded at the same time. 1 "life is high. Also, if the contact of the switchgear that is not responsible for closing or opening is made small, the contact can be manufactured at low cost.
- the first and second movable contacts and the fixed contact that contacts and separates from the first and second movable contacts, and the third and fourth movable contacts and the fixed that contacts and separates from the third and fourth movable contacts. It is characterized in that the material of at least one of the movable contact and the fixed contact is different from the contact.
- the contact for energization mainly uses a contact with low electrical resistance to suppress the temperature rise, or the duty of closing or opening is mainly used as a contact for switching. Can improve safety and prolong the service life by using contacts with high breaking performance and high melting point.
- the contact switch according to the next invention is characterized in that the first and second electromagnetic actuators are connected in parallel within the casing and are driven by the same control signal input.
- the man-hour for wiring to the electromagnetic actuator connection terminal is halved compared to the case where two conventional contact switches are used.
- the first and second switchgears are provided with a time difference in the closing timing, and are always closed in the same order. .
- the contact of the switchgear that is closed first does not generate an arc when the circuit is closed, and the contact is not melted by the arc, so that the welding resistance can be maintained high. 1.
- the contacts of the second switchgear are not welded at the same time, which is highly safe.
- the contact switch according to the next invention is characterized in that a time difference is provided in the timing at which the first and second switchgears are opened, and the circuits are always opened in the same order.
- the contact of the switchgear to be opened later does not generate an arc at the time of opening, and the contact is not melted by the arc, so that the welding resistance can be maintained high.
- the contact of the second switchgear is not welded at the same time, which is highly safe.
- the first and second switchgears have a time difference between the closing timing and the opening timing, respectively, so that the switchgear that is closed first opens later.
- the switchgear that is closed first and then opened is characterized by eliminating the duty of closing and opening.
- the switchgear that is closed first and then opened does not have the duty to close or open, the resistance to welding can be maintained high, and the contacts of the first and second switchgears can be connected simultaneously. It is no longer welded and highly safe.
- the contact switch according to the next invention is characterized in that no arc-extinguishing parts are installed in a switchgear that does not have the duty of closing or opening.
- FIG. 1 is a front view showing the appearance of a contact switch 100 according to the present invention
- FIG. 2 is a left side view thereof
- FIG. 3 is a top view thereof
- FIG. FIG. 5 is a rear perspective view of the same
- FIG. 6 is a perspective view of the contact switch 100 with the cover 2 and the case 1 removed.
- Fig. 7 is a diagram showing the arrangement of the movable dedendator from the back side
- Fig. 8 is a cross-sectional view taken along line A-A in Fig. 1
- Fig. 9 is a diagram of Fig. 1.
- FIG. 10 is a perspective view of the contact switch 10 0 with the cover 2 removed
- FIG. 1 1 is a view of the contact switch 100 0.
- Fig. 10 is a perspective view of the contact switch 10 0 with the cover 2 removed
- FIG. 1 1 is a view of the contact switch 100 0.
- FIG. 1 2 is a schematic diagram of the auxiliary circuit
- Fig. 1 3 is a perspective view of the back surface of the cover 2
- Fig. 1 4 is a diagram of the cover 2
- the terminal screw 1 6 is a perspective view of the contact switch with 6 removed.
- Fig. 15 is a bottom view of the same
- Fig. 16 is an enlarged view of part Z (external connection terminal) of Fig. 15
- Fig. 17 is a cover 2
- FIG. 18 is a front view of the contact switch 10 100 with the movable movable contacts 1 1 and 2 1 removed
- FIG. 18 is a lower perspective view thereof
- FIG. 19 is FIG.
- Fig. 20 is an enlarged view of Fig. 20 (fixed contact insertion part).
- FIG. 20 is a cross-sectional view (cross-sectional view of the relay contact) taken along line C-C in Fig. 17.
- Fig. 21 Fig. 2 is a cross-sectional view taken along line D-D in Fig. 17.
- Fig. 2 2 is a perspective view of spring receivers 3 2 a and 3 2 b.
- Fig. 2 3 is a side view of the same.
- Fig. 24 is a perspective view of the state shown in Fig. 17 with the fixed contacts 1 2 and 2 2 and the relay contact 30 removed, and Fig. 2 5 is the center of case 1
- Fig. 26 is a perspective view of the middle and joint contact 30, and
- Fig. 27 is FIG. 28 is a side view thereof, FIG. 29 is a bottom view thereof, FIG.
- FIG. 30 is a perspective view of a modification of the relay contact
- FIG. 3 The figure is an internal perspective view of the case 1 side when the contact switch 100 is disassembled into the case 1 side and the mounting base 3 side
- FIG. 3 2 is an internal perspective view of the mounting base 3 side
- Fig. 3 3 is a diagram showing the control circuit of the contact switch 1 00 according to the first embodiment.
- Fig. 3 4 shows the control circuit according to the second embodiment of the contact switch 1 0 0.
- FIG. 35 is a diagram showing a control circuit of Example 3 of the contact switch 100
- FIG. 36 is a control circuit of Example 4 of the contact switch 100 FIG.
- FIG. 1 is a front view showing the appearance of the contact switch of the present invention
- FIG. 2 is a left side view thereof
- FIG. 3 is a top view thereof
- FIG. 4 is a front view thereof.
- FIG. 5 is a rear perspective view of the same.
- the casing of the contact switch 10 0 contains an electromagnetic actuator and the like which will be described later, and a mounting base 3 for mounting the contact switch 10 0 to a control panel, etc.
- Case 1 and a cover 2 that covers the opening on the front side of case 1.
- Case 1 and mounting base 3 are fastened at three locations with mounting screws 3 1 x, 3 1 y, and 3 1 z.
- the case 1 and the mounting base 3 are fastened with three mounting screws.
- the case 1 and the mounting base 3 may be coupled by providing joints that engage with each other.
- a groove 3z is formed in the left-right direction for fitting a rail switch provided in the control panel or the like to attach the contact switch 100 to the rail.
- Two fixed hooks 3 za and 3 zb are provided on one side wall of the groove 3 z, and a movable hook 4 is installed on the other side wall to advance and retract the tip into the groove 3 z by a push spring 5.
- insert a screwdriver etc. into the groove 4 z provided in the movable hook 4 and pull it, and pull the movable hook 4 from the groove 3 z.
- the contact switch 10 ° can be installed in places other than the rail installation location such as the control panel. It is summer. As described above, the man-hour for attaching the contact switch 100 of this embodiment to a control panel or the like is not different from the man-hour for installing the conventional contact switch.
- FIG. 6 is a perspective view of the contact switch 100 with the cover 2 and the case 1 removed
- FIG. 7 is a view of the arrangement of the movable contacts from the back side.
- the contact switch 100 includes a first switch device 110 and a second switch device 120 each having a multi-pole (three-pole) main circuit and a one-pole auxiliary circuit.
- the circuits of the first opening / closing device 110 and the second opening / closing device 120 are connected in series.
- 1st and 2nd crossbars of portal type 1 3 and 2 3 forces 3 poles of normally open movable contacts 1 1 and 2 1 and 1 pole of normally closed movable contacts 4 1 and 4 2 are supported .
- Each of the first and second crossbars 1 3 and 2 3 operates a plurality of movable contacts simultaneously.
- FIG. 8 is a cross-sectional view taken along the line AA in FIG. 1
- FIG. 9 is a cross-sectional view taken along the line BB in FIG.
- First and second normally open movable contacts 1 1 a and 1 1 b are provided at both ends of the plurality of first normally open movable contacts 11 of the main circuit, respectively.
- One end of a plurality of contact springs 15 is connected to the lower side of a plurality of square windows provided on the first crossbar 1 3 via the spring support 3 2 a with the center of the first normally open movable contact 1 1
- the first normally-open movable contactor 11 is supported by the first crossbar 13.
- the other end of the contact spring 15 is supported by the upper sides of a plurality of square windows provided in the first cross bar 13.
- the contact spring 15 applies contact pressure to the first and second normally open movable contacts 1 1 a and 1 1 b.
- a movable iron core 18 is attached to the end of the crossbar 1 3 mounted in the case 1 so as to be movable to the base 3 side.
- the mounting base 3 as a housing accommodates and installs a fixed iron core 1 9 equipped with a coin 1 7.
- the fixed iron core 1 9 is connected to a movable iron core 1 8.
- Opposing and adsorbing the movable iron core 18 by magnetization Between the fixed iron core 1 9 and the movable iron core 18, there is provided a return spring 14 that pushes the movable iron core 18 back and returns when the magnetization of the fixed iron core 19 is released.
- the cross bar 13, the movable iron core 18, the fixed iron core 19, the coil 17, the return spring 14, etc. constitute the first electromagnetic actuator 17 A. Further, the first electromagnetic actuator 17 A, the contact spring 15, the first normally open movable contact 11, etc. constitute the first switching device 110.
- Third and fourth normally open movable contacts 2 1 b and 2 1 a are provided at both ends of the plurality of second normally open movable contacts 21 of the main circuit, respectively.
- One end of the plurality of contact springs 25 is connected to the lower side of the plurality of square windows provided in the second crossbar 2 3 through the spring receiver 3 2 b through the center of the second normally open movable contact 2 1.
- the second normally open movable contact 21 is supported by the second crossbar 23.
- the other end of the contact spring 25 is supported by the upper sides of a plurality of square windows provided on the second cross bar 23.
- the contact spring 25 applies a contact pressure to the third and fourth normally open movable contacts 2 1 b and 2 1 a.
- a movable iron core 28 is attached to the end of the second crossbar 2 3 installed in the case 1 so as to be movable toward the mounting base 3 side.
- the mounting base 3 as a housing accommodates and installs a fixed iron core 29 provided with a coil 27.
- the fixed iron core 29 faces the movable iron core 28 and adsorbs the movable iron core 28 by magnetization.
- a return spring 24 that pushes back the movable iron core 28 when the magnetization of the fixed iron core 29 is released.
- the second cross bar 23, the movable iron core 28, the fixed iron core 29, the coin 27, the return spring 24, and the like constitute the second electromagnetic actuator 27A.
- the second electromagnetic actuator 27 A, the contact spring 25, the second normally open movable contact 21, and the like constitute the second switching device 120.
- a plurality of first and second fixed contacts 1 2 and 2 2 are installed at the upper and lower ends of the middle stage of case 1, and are fixed to contact and separate from the first and fourth normally open movable contacts at one end, respectively. It has contacts 1 2 a and 2 2 a, the other end is an external connection terminal, and terminal screws 16 and 26 are screwed in.
- a plurality of relay contacts 30 are installed at the center of the middle stage of case 1, and one end thereof has a fixed contact 30a that contacts and separates from the second normally open movable contact 11b. The end has a fixed contact 30 b that contacts and separates from the third normally open movable contact 21 b.
- the main circuit three-pole external connection terminal is formed at the other end of the second fixed contact 22 and the external connection terminal and terminal screw 16 formed at the other end of the first fixed contact 12
- the external connection terminal and terminal screw 26 are only the external connection terminal and terminal screw 26, and the external connection terminal and terminal screw 16 formed on the other end of the first fixed contact 12 are connected to the power supply side wiring, and the second fixed contact
- the external connection terminal and the terminal screw 26 formed on the other end of the contact 22 are connected to the load side wiring. Therefore, the number of main circuit wires of the contact switch 100 according to this embodiment is three on the power supply side and three on the load side, which is the same as the number of wires on the three main circuits of the conventional contact switch.
- the relay contact 30 is not provided with an external connection terminal, and is covered with the cover 2 so that the relay contact 30 cannot be touched from the outside and there is no fear of electric leakage.
- the contact switch 100 of this embodiment two switchgears are accommodated in one casing, and even if contact welding occurs in one of the switchgears, the other switchgear Since the main circuit can be opened with a single failure, the safety function is not impaired by a single failure.
- FIG. 10 is a perspective view of the contact switch 100 with the cover 2 removed.
- FIG. 1 1 is a schematic diagram of the main circuit of the contact switch 100.
- FIG. FIG. 13 is a schematic diagram of the auxiliary circuit
- FIG. 13 is a perspective view of the back surface of the cover 2.
- the contact switch 100 has a one-pole auxiliary circuit in addition to the main circuit three-pole.
- auxiliary First and second normally closed movable contacts 4 1 a and 4 1 b are provided at both ends of the first normally closed movable contact 41 of the circuit.
- One end of the contact spring 7 1 presses the center of the first normally closed movable contact 4 1 through the spring support 8 1 against the upper side of the square window provided in the crossbar 1 3, and the first normally closed movable The contact 4 1 is supported by the cross bar 1 3.
- the other end of the contact spring 7 1 is supported by the lower side of the square window provided in the cross bar 13.
- the contact spring 71 applies a contact pressure to the first and second normally closed movable contacts 4 1 a and 4 1 b.
- Third and fourth normally closed movable contacts 4 2 b and 4 2 a are provided at both ends of the second normally closed movable contact 42 of the auxiliary circuit.
- One end of the contact spring 7 2 presses the center of the second normally closed movable contact 4 2 to the upper side of the square window provided in the crossbar 2 3 via the spring receiver 8 2, and the second normally closed movable
- the contact 4 2 is supported by the cross bar 2 3.
- the other end of the contact spring 72 is supported by the lower side of the square window provided in the crossbar 23.
- the contact spring 7 2 applies contact pressure to the third and fourth normally closed movable contacts 4 2 b and 4 2 a.
- the first and second fixed contacts 5 1 and 5 2 are installed at the upper and lower ends of the middle stage of the case 1, and are in contact with the first and fourth normally closed movable contacts at one end respectively. a, 5 2 a, the other end is an external connection terminal, and terminal screws 6 1 and 6 2 are screwed in.
- a relay contact 40 is installed at the upper center of the case 1, one end of which has a fixed contact 40 a that contacts and separates from the second normally closed movable contact 4 1 b, and the other end
- the third normally closed movable contact 4 2 b is in contact with the fixed contact 40 b.
- the first and second normally closed movable contacts 4 1 and 4 2 of the auxiliary circuit operate simultaneously with the first and second normally open movable contacts 1 1 and 2 1 of the main circuit.
- the first and second normally closed movable contacts 4 1 and 4 2 are connected to the first and second electromagnetic actuators 1 7 A and 2 7 A, respectively.
- the return springs 1 4 and 2 4 push the crossbars 1 3 and 2 3 forward and the normally closed movable contacts 4 1 a, 4 1 b, 4 2 b, 4 2 a
- fixed contacts 5 1 a, 4 0 a, 4 0 b, 52 a force S contact, and contact springs 71 and 72 are compressed by a predetermined amount ⁇ T b. This compressive force is applied to the first and second normally closed movable contacts 41 and 42, and becomes the contact pressure of the contacts.
- the contact switch 100 is fixed to the movable cores 18 and 28 when the first and second electromagnetic actuators 17 A and 27 A are in the non-excited state and the main circuit 3 poles are opened.
- the gap between iron cores of constant iron cores 1 and 29 is ST, normally open movable contact 1 1 a, lib, 2 1 b, 21 a and fixed contact 1 2 a, 30 a, 30 b, 22 a Is set so that ST> ga, and normally open movable contacts 1 1 a, llb, 21 b, 2 1 & and fixed contacts 1 2 &, 30 a, 30 b, 22 a
- the contact switch 100 is set to satisfy ST> ⁇ Ta + ⁇ Tb.
- the normally closed movable contact 4 la, 41 b, 42 b, 42 a and the fixed contact 5 1 a, 40 a, 40 b are always used.
- the contact switch 100 of the present embodiment has grooves 2 za and 2 zb (see FIG. 13) provided in the cover 2 and projections 1 provided in the case 1.
- the cover 2 can be removed from the case 1 by removing it from za, 1 zb (see Fig. 10).
- Case 1 has openings on the front and top and bottom surfaces, and if you remove cover 2 that covers the front and top and bottom openings, you can see inside Case 1 It is possible to check the wear status of all contacts. In other words, unlike conventional methods, it is not necessary to open the covers of the two contact switches in order to check the contact wear status.
- Fig. 14 is a perspective view of the contact switch with the cover 2 and the terminal screw 16 removed
- Fig. 15 is a bottom view thereof
- Fig. 16 is a view of Fig. 15 It is an enlarged view of Z section (external connection terminal).
- the square windows provided in the first and second crossbars 1 3 and 2 3 The heights of the first and second normally open movable contacts 1 1 and 2 1 that are in contact with the lower side 2 3 w are higher than the top surfaces of the first and second fixed contacts 1 2 and 2 2. 1 Increased by distance D in Fig. 6. Therefore, if the cover 2 is removed, the first and second normally open movable contacts 1 1 and 2 1 can be easily pulled out from the first and second crossbars 1 3 and 2 3. .
- FIG. 17 is a front view of the contact switch 100 with the cover 2, terminal screw 16 and normally open movable contacts 11 and 21 removed, and Fig. 18 shows the lower side
- FIG. 19 is an enlarged view of a portion X (fixed contact insertion portion) of FIG.
- FIG. 17 shows the state of case 1 after the normally open movable contacts 1 1 and 2 1 are pulled out.
- Fixed contacts 1 2 and 2 2 are press-fitted along the groove lx (see Fig. 18 and Fig. 19) of case 1 provided for each pole on the power supply side and load side of the main circuit 3 poles It can only be pulled out and removed.
- FIG. 20 is a cross-sectional view taken along line C-C in FIG. 17 (relay contact cross-sectional view), and FIG. 21 is a cross-sectional view taken along line DD in FIG.
- Fig. 2 2 is a perspective view of the spring receivers 3 2 a and 3 2 b
- Fig. 2 3 is a side view thereof
- Fig. 2 4 is a further fixed contact from the state of Fig. 17
- Fig. 25 is a perspective view of the center 1 of the case 1 with the child 1 2 and 2 2 and the relay contact 30 removed
- Fig. 26 shows the middle and joint contact.
- FIG. 27 is a front view thereof
- FIG. 28 is a side view thereof
- FIG. 29 is a bottom view thereof
- the relay contact 30 is fixed to a pedestal 1 h provided substantially in the center of the case 1, and after the first and second normally open movable contacts 1 1 and 2 1 are removed, It can be pulled out in the front direction of Fig. 17 and removed. ⁇
- the new first and second normally open movable contacts When 1 1 and 2 1 are reattached to the 1st and 2nd crossbars 1 3 and 2 3, as shown in Fig. 2 3, the spring supports 3 2 a and 3 2 b have normally open movable contacts. Since the tapered part 3 2 d is provided on the periphery of the contact surface with 1 1 and 2 1, the first and second normally open movable contacts 1 1 and 2 1 are provided on this tapered part 3 2 d.
- the tapered portion 3 2 d may have an arc shape.
- the contact wear condition is checked, and when it is determined that the contact must be replaced, the contact can be easily replaced.
- the contact switch 100 can be maintained in a state in which contact welding hardly occurs.
- pedestal lh is formed in the approximate center of case 1, and as shown in Fig. 25, pedestal lh has a pair of grooves 1 hd for each pole of the main circuit. Is provided.
- the relay contact 30 is formed with a pair of protrusions 30 0 dm and 30 0 dn. As shown in FIGS. 20 and 21, the relay contact 30 is inserted into the pair of grooves 1 hd of the pedestal 1 h. Fixed to case 1.
- the groove 1 h d and the projections 30 0 dm and 30 0 dn have an interference fit, and the relay contact 30 is fixed to the case 1 without rattling.
- the cover 2 is provided with a protrusion 2 d, Since the relay contact 30 is sandwiched and fixed between the projection 2d and the base 1h (see FIG. 6), it does not come off the case 1.
- pedestals 1 ra and 1 rb for supporting the contact contact portion of the relay contact 30 from the back side are provided on the main circuit 3 poles of the case 1 respectively. . Since the portion close to the contact of the relay contact 30 is supported by the pedestals 1 ra and 1 rb, the relay contact 30 is not deformed by a mechanical load accompanying the opening and closing of the contact. Further, as shown in FIG. 30, by making the cross section of the relay contact 30 substantially U-shaped, mechanical strength can be obtained without providing the bases l ra and 1 r b.
- the relay contact 40 of the auxiliary circuit is also fixed to the case 1 in the same manner as the relay contact 30 of the main circuit.
- FIG. 3 1 is an internal perspective view of the case 1 side when the contact switch 100 is disassembled into the case 1 side and the mounting base 3 side
- Fig. 3 2 is an internal perspective view of the mounting base 3 side.
- FIG. 33 is a diagram showing a control circuit of Example 1 of the contact switch 100
- FIG. 34 is a diagram showing a control circuit of Example 2 of the contact switch 100.
- FIG. 35 is a diagram showing a control circuit of Example 3 of the contact switch 100
- FIG. 36 is a diagram showing a control circuit of Example 4 of the contact switch 100.
- the control circuit of the contact switch 100 will be described below.
- the coil 17 is connected to the coil connection terminals 10a and 10b, and the coil connection terminals 10a and 10b are provided with terminal screws 20a and 20b.
- the coil 27 is connected in parallel to the coil 17 to the coil connection terminals 10 a and 10 b through a contact wire (not shown) that passes through the groove 3 w of the mount 3. Therefore, the first and second switching devices 110, 120 of the contact switch 100 are driven by the same control signal.
- a control circuit for controlling the driving of the first and second opening / closing devices 1 1 0, 1 20 is arranged at the bottom of the mounting base 3, and is fixed to the bottom by the casting agent 33 and insulated. .
- FIGS. 33 to 36 are examples of control circuits for controlling the first and second opening / closing devices 1 1 0 and 1 2 0.
- the control circuit is equipped with relay 6, capacitor 7, full-wave rectifier 8, etc.
- the contact switch 100 according to this embodiment is an example provided with the control circuit shown in FIG. The operation of the contact switch 100 when each control circuit is applied will be described below.
- the first and second switching devices 1 1 0 and 1 2 0 are always closed and opened simultaneously. Therefore, when the circuit is opened, the arc is interrupted at 4 points on each pole of the main circuit, and the arc can be interrupted quickly compared to the conventional contact switch that interrupts the arc at 2 points. Since the arc can be shut off quickly, the contact load caused by the arc is reduced, contact wear is reduced, and contact welding is less likely to occur.
- the cross bar 13 moves and presses the switch 6 s (see FIG. 32) provided on the relay 6.
- the switch 6 s When the switch 6 s is pressed, the normally open contact of the relay 6 is closed, a control signal is input to the coil 27 of the second switch device 120, and the second switch device 120 is closed.
- the coil connection terminals 1 0 a, 1 0 b force, and the control signal disappears, so the excitation of both coils 1 7 and 2 7 is released, so the first and second switchgear 1 1 0 and 1 2 0 are opened simultaneously. Since the first opening / closing device 110 is always closed first when the circuit is closed, the arc is always generated only at the second opening / closing device 120 when the circuit is closed.
- the contact of the first switchgear 1 1 0 No arc load is applied.
- the arc is interrupted at 4 points on each pole of the main circuit, so the arc can be interrupted more quickly than the conventional contact switch interrupts the arc at 2 points. It becomes. Since the arc can be interrupted quickly, the load applied to the contact by the arc when the circuit is opened is reduced, and the wear of the contact is also reduced. In this control circuit, the contact wear of the first opening / closing device 110 is always smaller than the contact wear of the second opening / closing device 120 by the amount that no arcing occurs during closing.
- the contacts of the first and second switchgear 1 1 0, 1 2 0 are welded simultaneously. The possibility is low, and the main circuit can be opened by the first switchgear 1 1 0 even when the contact of the second switchgear 1 2 0 is welded, and safety is high.
- the first and second switchgears 1 1 0 and 1 2 0 are closed simultaneously when the circuit is closed, and the second switch is always opened when the circuit is opened.
- the first opening / closing device 1 1 0 is opened.
- the reason for the time difference in the open circuit timing is that the capacitor 7 is connected in parallel with the coil 27 and the full-wave rectifier 8 is connected in series.
- the control signal from the coin connection terminals 10 a and 10 b disappears, the excitation of the coil 27 is released and the second switching device 120 is opened.
- the coil 1 7 is kept excited by the discharge of the capacitor 7 even after the excitation of the coil 2 7 is released.
- the discharge current of the capacitor 7 does not flow to the coil 27 due to the function of the full-wave rectifier 8. Since the second switchgear 1 2 0 is always opened first when the circuit is opened, the arc is generated only at the contact of the second switchgear 1 2 0 when the circuit is opened, and the first switchgear 1 1 No arc load is applied to the zero contact. When closed, the first and second switchgears 1 1 0 and 1 2 0 are closed simultaneously, but strictly speaking, the contact points of the first and second switchgears 1 1 0 and 1 2 0 are closed. The timing is different, and an arc will be generated in whichever circuit is closed first. It is probabilistically determined at which contact the arc at the time of closing will occur.
- the probability of occurrence of an arc at closing is almost equal It is considered that contact wear occurs while the two contact groups are subjected to almost the same load due to the arc when the circuit is closed.
- the contact wear of the contact of the first switchgear 110 is smaller than the contact wear of the contact of the second switchgear 120, as long as no arc is generated at the time of opening.
- the possibility of the contacts of 2 switchgears 1 1 0 and 1 2 0 being welded at the same time is low, and when the contacts of the second switchgear 1 2 0 are welded, the first switchgear 1 1 0
- the circuit can be opened and safety is high. When this control circuit is applied when there is no duty at the time of closing, an arc is not always generated at the contact of the first switching device 110, which is more effective.
- the heat capacity increases as the contact volume increases, making it difficult for the contact to melt and reducing the probability of welding. Also, as the area of the contact point increases, the arc generation points are dispersed by that amount, so the progress of melting on the surface of the contact point is delayed and the probability of occurrence of welding decreases.
- the first switchgear 110 is less likely to be welded than the second switchgear 120 in any case.
- the switchgear 110 and the second switchgear 120 do not necessarily need to use the same contact.
- the contact of the first switchgear 110 has a contact diameter of 4.3 mm and a contact thickness of 1. Omm
- the contact of the second switchgear 1 20 has a contact diameter of 4.5 mm and a contact thickness of 1.2 mm.
- the first switchgear 110 is designed to reduce costs, and the second switchgear 120 ensures safety 1 "life.
- first and second switchgears 1 10 and 120 not only have a large contact size difference, but also the first switchgear 1 10 contact point that is difficult to weld (that is, either the closing duty or the opening duty) 2)
- the second switchgear that is easy to weld by using a contact point of Ag 100 ° / 0 which has a relatively low melting point but a low electrical resistance. It is also possible to ensure safety by using an AgCd O contact with excellent interrupting performance.
- control circuit shown in FIGS. 33 to 36 is shown as a means for shifting the closing or opening timing of the first and second switching devices 110 and 120, the closing or opening timing is shifted.
- the means is not limited to this.
- the closing timing or opening timing of the first and second switching devices 110 and 120 is shifted using electrical means, but the timing can also be shifted using mechanical means.
- the gap between the iron cores of the first and second switchgear 1 10 and 120 and the fixed iron cores 19 and 29 is the same, and the normally open movable contact 1 1 a, lib, 21 a, 21 b And the fixed contact 12a, 30a, 22a, 30b.
- the switchgear with a large gap between contacts is always closed later.
- the contact overtravel amount of the switchgear with a large gap between the contacts is the amount of contact over the label of the switchgear with a small gap between the contacts Therefore, a switchgear with a large gap between contacts is always opened first.
- an opening / closing device with a small gap between contacts does not generate an arc both at the time of closing and at the time of opening, so that the contact does not wear out except for mechanical wear, and the contact wear is large in the gap between the contacts.
- 1 and 2 switchgear 110, 120 force S is less likely to be welded at the same time, and even when a switchgear with a large gap between the contacts is welded, The main circuit can be opened by a switchgear with a small gap, which is highly safe.
- the suction force of the first and second electromagnetic actuators 17A and 27A is differentiated to differentiate the suction speed of the movable iron cores 18 and 28, and the friction coefficient of the sliding parts of the crossbars 13 and 23 is increased.
- the timing of closing or opening of the first and second switching devices 110 and 120 can be shifted using means such as making a difference or making a difference in the spring force of the return springs 14 and 24.
- the present invention can also be applied to a contact switch using a normally closed movable contact in the main circuit.
- the main circuit is not limited to 3 poles but may be 2 poles or 4 poles or more.
- the contact switch according to the present invention is useful for switching a main circuit of a load such as a three-phase AC motor, and in particular, a single unit is used for I S013849-1 (JIS 970 5-1) or the like. Satisfies the safety measures along.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
- Switch Cases, Indication, And Locking (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2004/007579 WO2006008781A1 (ja) | 2004-05-26 | 2004-05-26 | 接点開閉器 |
TW093116791A TWI242221B (en) | 2004-05-26 | 2004-06-11 | Contact switch |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/007579 WO2006008781A1 (ja) | 2004-05-26 | 2004-05-26 | 接点開閉器 |
Publications (1)
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WO2006008781A1 true WO2006008781A1 (ja) | 2006-01-26 |
Family
ID=35784917
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PCT/JP2004/007579 WO2006008781A1 (ja) | 2004-05-26 | 2004-05-26 | 接点開閉器 |
Country Status (2)
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TW (1) | TWI242221B (ja) |
WO (1) | WO2006008781A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11456688B2 (en) | 2020-11-30 | 2022-09-27 | General Electric Renovables Espana, S.L. | Systems and methods for operating a power generating asset |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JP5948176B2 (ja) * | 2012-07-24 | 2016-07-06 | 株式会社日立製作所 | 開閉器 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5529973Y2 (ja) * | 1972-03-29 | 1980-07-17 | ||
JPS5646118U (ja) * | 1979-09-17 | 1981-04-24 | ||
JPS6332430U (ja) * | 1986-08-19 | 1988-03-02 | ||
JPS6338517Y2 (ja) * | 1982-12-24 | 1988-10-11 | ||
JPH04115740U (ja) * | 1991-03-22 | 1992-10-14 | 春日電機株式会社 | 可逆電磁接触器 |
JPH08212899A (ja) * | 1995-02-02 | 1996-08-20 | Mitsubishi Electric Corp | 電磁接触器及びその製造方法 |
JP2001506050A (ja) * | 1996-12-09 | 2001-05-08 | ヨカブ セイフティー アクティエボラーグ | セーフティ・リレー |
JP2003511841A (ja) * | 1999-10-08 | 2003-03-25 | シーメンス アクチエンゲゼルシヤフト | 少なくとも2つの接触器と1つの安全な駆動ユニットを有するアクチュエータユニット |
JP2003514361A (ja) * | 1999-11-12 | 2003-04-15 | ピルツ ゲーエムベーハー アンド コー. | 電気負荷の接続および安全接続解除のための安全切換装置、特に、電気駆動装置 |
-
2004
- 2004-05-26 WO PCT/JP2004/007579 patent/WO2006008781A1/ja active Application Filing
- 2004-06-11 TW TW093116791A patent/TWI242221B/zh not_active IP Right Cessation
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5529973Y2 (ja) * | 1972-03-29 | 1980-07-17 | ||
JPS5646118U (ja) * | 1979-09-17 | 1981-04-24 | ||
JPS6338517Y2 (ja) * | 1982-12-24 | 1988-10-11 | ||
JPS6332430U (ja) * | 1986-08-19 | 1988-03-02 | ||
JPH04115740U (ja) * | 1991-03-22 | 1992-10-14 | 春日電機株式会社 | 可逆電磁接触器 |
JPH08212899A (ja) * | 1995-02-02 | 1996-08-20 | Mitsubishi Electric Corp | 電磁接触器及びその製造方法 |
JP2001506050A (ja) * | 1996-12-09 | 2001-05-08 | ヨカブ セイフティー アクティエボラーグ | セーフティ・リレー |
JP2003511841A (ja) * | 1999-10-08 | 2003-03-25 | シーメンス アクチエンゲゼルシヤフト | 少なくとも2つの接触器と1つの安全な駆動ユニットを有するアクチュエータユニット |
JP2003514361A (ja) * | 1999-11-12 | 2003-04-15 | ピルツ ゲーエムベーハー アンド コー. | 電気負荷の接続および安全接続解除のための安全切換装置、特に、電気駆動装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11456688B2 (en) | 2020-11-30 | 2022-09-27 | General Electric Renovables Espana, S.L. | Systems and methods for operating a power generating asset |
Also Published As
Publication number | Publication date |
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TW200539210A (en) | 2005-12-01 |
TWI242221B (en) | 2005-10-21 |
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