JP3093323U - Thermal overload relay for phase loss protection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the assembly tolerance of a plate spring, minimize the position change of the plate spring due to external shock and vibration, and improve the reliability of equipment, which can improve the reliability of equipment. Provide a relay. A release lever (32) for transmitting the operation of an actuator (6) to a switching mechanism (36) when an overcurrent or an open phase occurs, and a release lever (32) connected to a swing center point of the release lever (32) according to a change in an operation current set value.
And an adjusting mechanism 34 for moving the center point of the swing of the adjusting dial 34. The adjusting mechanism 34 includes an adjusting dial 37 operated by the user.
And an adjusting link 34 connected to the hinge shaft 62 of the release lever, and a plate spring 39 for applying a predetermined elastic force to the adjusting link 34. Constitutes a thermodynamic overload relay for phase loss protection so as to protrude the projection 45 in order to minimize the gap with the plate spring 39.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention relates to a thermal overload relay for phase loss protection. It prevents the plate spring from swinging when it is fastened and prevents the release lever from The present invention relates to a thermal type overload relay for open-phase protection capable of preventing swinging.

[0002]

[Prior art]

  Generally, a motor normally carries three-phase (R-phase, S-phase, and T-phase) currents. Of these three phases, either one or two phases are disconnected for some reason and the current is interrupted. If it is cut off, an overcurrent that concentrates current in the remaining two phases or one phase Causes a phase loss phenomenon that burns out the motor.

[0003]   The motor burnout protection function due to such phase loss and the motor damage due to normal overload Thermal overload relays with burnout protection function It is called a relay.

[0004]   And, the structure of the conventional thermal overload relay for open phase protection is as shown in Fig. 6. An actuator that is housed inside the case 102 and that operates when an overcurrent or open phase occurs Mounted on the inside of the case 104 and the case 102 to operate the actuator 104. Therefore, the sliding shifter 106 and the inside of the case 102 are mounted on the front side. A switching mechanism 108 for disconnecting or connecting the electric circuit by the operation of the shifter 106. It is configured to include.

[0005]   In addition, the actuator 104 is erected at a predetermined interval inside the case 102. And a plurality of bimetals 110 that are connected to the shifter 106 at the upper end, Winding on bimetal 110 and connecting to three terminals 114 for applying power, It is configured to include a heating coil 112 that generates heat when generated.

[0006]   Also, the shifter 106 should not slide due to the bending of the bimetal 110. Then, the switching mechanism 108 is operated.

[0007]   The switching mechanism 108 swings in the left-right direction by the pushing force of the shifter 106. The temperature compensating bimetal 120 and the upper and lower parts that are fastened to the upper end of the temperature compensating bimetal 120 The release lever 124 that swings in the direction and the swing center point of the release lever 124 is connected. To change the swing center point of the release lever 124 when the operating current setting value is changed. The contacts are opened and closed by vertically swinging the adjusting mechanism 135 and the release lever 124. A switching mechanism 136 for breaking or connecting a circuit and the release lever 124 The switching mechanism 136, which operated in the circuit cutoff state, is returned to its original state. The reset button 126 is included.

[0008]   That is, as shown in FIG. 7, the release lever 124 is bent in an L shape. A hinge hole 140 for connecting the adjusting mechanism 135 is formed at the upper end of the hinge hole 140, and the hinge hole 140 is formed. One of the holes 140 is extended downward by a predetermined length and the temperature compensation bimetal 120 is inserted. A protrusion 144 for heat fusion is formed so as to be fitted, and the protrusion 144 for heat fusion and the connection hole 148 are formed. The temperature-compensating bimetal 120 formed with holes is inserted and fused. .

[0009]   Fusion process between the release lever 124 and the temperature compensating bimetal 120 configured as described above , The temperature-compensating bimetal 120 is connected to the heat-fusion protrusion 144 of the release lever. After the connection hole 148 is inserted, heat is applied to the front of the heat-sealing protrusion 144 to connect the connection hole 148. To the contact surface between the release lever 124 and the temperature-compensating bimetal 120. An adhesive is applied between them to complete the assembly.

[0010]   In addition, the adjusting mechanism 135, as shown in FIG. 8 and FIG. Adjustment dial 139 that can be operated by the user by swingably attaching it to the section, and the adjustment dial 1 39 and engages with the hinge portion 140 of the release lever to turn the adjustment dial 139. An adjustment link 130 for moving the hinge portion 140 of the release lever by rolling, It is mounted on one side of the adjustment link 130 to apply a predetermined elastic force to the adjustment link 130. And a plate spring 137. The adjustment link 130 is elastically supported while expanding or compressing by swinging the dial 139. The auxiliary cover 143 attached to the rear of the auxiliary case 103 Thus, the adjustment link 130 is supported.

[0011]   In addition, the plate spring 137 allows the auxiliary cover 143 to be easily assembled. Thus, the auxiliary cover 143 has an assembly tolerance L of about 1 mm.

[0012]   Further, the adjusting mechanism 135 is used when changing the initially set trip current value of the device. If the adjustment dial 139 is rotated, the adjustment link 130 moves and the release The trip shaft value of the device is adjusted by the hinge shaft 140 of the lever 124. When the plate 130 moves, the plate spring 137 expands or contracts, and the plate spring 137 expands or contracts. The adjusting link 130 is stably supported.

[0013]

[Problems to be solved by the device]

  Therefore, in such a conventional thermal overload relay for open phase protection, the The seat spring is mounted behind the auxiliary case so that it can be easily assembled to the device. There is about 1mm of assembly tolerance between the auxiliary cover and the plate spring. Therefore, if a shock or vibration occurs in the device, the plate spring will Since the engagement state collapses and changes by swinging within the assembly tolerance, adjustment of the adjustment dial If the accuracy value is not accurately transmitted to the release lever and the reliability of the device decreases There was a disadvantage.

[0014]   In addition, in order to connect the temperature compensating bimetal to the release lever by heat fusion, Damage to the connection part of the temperature compensating bimetal due to the fusing temperature and the surrounding environment If there is a concern that defective products will be generated due to The joint part is separated due to external vibration and operating pressure. However, there is an inconvenience that the product is lowered in the left-right direction and the reliability of the product is reduced.

[0015]   The present invention has been made in view of the above-mentioned conventional problems. The position of the plate spring due to external shock and vibration with minimal assembly tolerances Change is minimized and the adjustment accuracy value of the adjustment dial is accurately transmitted to the release lever. By providing a thermal overload relay for open-phase protection that can improve the reliability of equipment operation The purpose is to do.

[0016]   Also, simply insert the temperature compensating bimetal into the release lever to complete the assembly. This simplifies the assembly work, shortens the assembly time, and prevents the temperature-compensating bimetal from swinging. Of the thermal overload relay for open phase protection that can improve product reliability by stopping The purpose is to provide a lever.

[0017]

[Means for Solving the Problems]

  In order to achieve such an object, the thermal overload relay for open-phase protection according to the present invention In the case of overcurrent or open phase, A release lever equipped with a temperature-compensating bimetal so that it can be transmitted to the rhythm It is housed inside the case and is connected to the swing center point of the release lever. Adjusting mechanism for moving the swing center point of the release lever according to the change of the flow set value And the adjustment mechanism is engaged with an adjustment dial operated by a user. Adjustment link connected to the hinge shaft of the release lever, and the adjustment link And the adjustment is performed by engaging between the auxiliary covers mounted on the rear surface of the auxiliary case. And a plate spring for applying a predetermined elastic force to the link. The inner wall surface of the auxiliary cover is designed to minimize the gap with the plate spring. It is characterized in that the projecting portion of is formed to project.

[0018]   In addition, the protrusion of the auxiliary cover has a space of about 0.2 mm from the plate spring. It is characterized in that it has a predetermined height so as to maintain.

[0019]   In addition, the release lever is connected to the temperature compensating bimetal by drilling. A connection protrusion into which the hole is inserted is projected, and the temperature compensation bimetal is attached to the connection protrusion. The stop ring that maintains the connection force with the In order to prevent the movement, a hooking protrusion is provided on the left and right of the connecting protrusion at a predetermined interval. 64, and insert the upper end of the temperature compensating bimetal between the hooking protrusions. It is characterized by matching.

[0020]

[Embodiment of device]

  Embodiments of the present invention will be described below with reference to the drawings.

[0021]   In the construction of the thermal overload relay for open phase protection according to the present invention, as shown in FIG. As you can see, it is housed inside the case 2 and connected to the three terminals 4 that apply external power. The actuator 6 that operates when overcurrent or open phase occurs, and the case 2 It is mounted above the inside of and slides by the operation of the actuator 6. The shifter 12 and the auxiliary case 8 mounted above the inside of the case 2 are stored inside A configuration including a switching mechanism 10 that shuts off the circuit by driving the shifter 12. Has been done.

[0022]   In addition, a plurality of the actuators 6 are arranged inside the case 2 at predetermined intervals. Installed in a state where the lower end is fixed to the case 2 and the upper end is in contact with the shifter 12. Bimetal 14 and three ends wound around those bimetals 14 to apply external power It is composed of a heating coil 16 that is connected to each child 4 and generates heat when an overcurrent occurs. Has been.

[0023]   Also, the shifter 12 is slidably mounted above the case 2 and An upper shifter 20 that moves linearly due to the bending of the bimetal 14 when an electric current is generated; It is slidably attached to the lower surface of the upper shifter 20 so that the bimetal 14 When returning to the original state, the lower slides in the opposite direction to the upper shifter 20. And a lower shifter 22 swingably supported and engaged with the upper shifter 20. Shifter that is swung by the linear movement of the upper shifter 20 and the lower shifter 22. And the Trevor 24.

[0024]   Further, the switching mechanism 10 is moved in the left-right direction by the pushing force of the shift lever 24. Temperature-compensating bimetal 30 that is swung by the And a release lever 32 that is engaged by a pulling 68 and swings in the vertical direction. It is connected to the center point of rocking of the lever 32 and the release The adjusting mechanism 35 for swinging the swing center point of the bar 32 and the vertical direction of the release lever 32. Switching mechanism that opens and closes the contacts by swinging to interrupt or connect the circuit 36 And the switching mechanism swung to the circuit break position by the release lever 32. The reset button 38 for returning the rhythm 36 to the original state is included.

[0025]   Further, the switching mechanism 36 is operated by the release lever 32. As shown in the figure, the reverse spring 40 is connected to one side, and the first movable contact is made under normal conditions. The contact 42 and the first fixed contact 44, and the release lever 32 of the release lever 32 due to the occurrence of overcurrent or open phase. It is composed of a second movable contact 46 and a second fixed contact 48 which are brought into contact with each other by operation.

[0026]   In addition, the temperature compensating bimetal 30 according to the present invention and the release lever 32 are in the engaged state. In addition, as shown in FIGS. 2 to 4, the release lever 32 includes the adjustment mechanism. A hinge hole 62 is formed in the 35 so that it can be swingably inserted. One side is bent to a predetermined length, and the latching protrusions 64 are formed to project downward on both sides of the end. On the other hand, the other is formed by extending a predetermined length in the horizontal direction and swinging to form the switching mechanism. It is formed so as to push the nysm 36, and under the hooking protrusion 64 below the hinge hole 62. On the side, there is a connection protrusion 66 so as to insert the connection hole 60 of the temperature compensation bimetal 30. It is protruding.

[0027]   Further, the temperature compensating bimetal 30 is formed of a metal material into a flat plate shape having a predetermined length. The upper end of the release lever 32 is inserted between the latching protrusions 64 on both sides of the release lever 32. The insertion portion 67 is formed by cutting, and the release lever 32 is connected below the insertion portion 67. A connection hole 60 to be inserted into the continuous protrusion 66 is formed by punching.

[0028]   Further, the stop ring 68 is inserted into the connection protrusion 66 to insert the temperature compensation bias. It is designed to prevent the metal 30 from coming off.

[0029]   When assembling the release lever 32 and the temperature compensating bimetal 30, After inserting the upper end of the temperature-compensating bimetal 30 between the locking protrusions 64 of the lever, Insert the connection hole 60 of the temperature compensation bimetal 30 into the connection protrusion 66 of the release lever 32. Then, the stop ring 68 is driven into the connection protrusion 66 to complete the assembly. .

[0030]   At this time, the insertion portion 67 of the temperature compensating bimetal 30 is engaged with the release lever 32. The left and right side surfaces of the inserting portion 67 of the temperature compensating bimetal 30 are inserted between the stopper projections 64 and By closely contacting both sides of the hooking protrusion 64, the left side of the temperature compensating bimetal 30 Swing to the right is prevented.

[0031]   At this time, in the adjusting mechanism 35, as shown in FIG. The stroke of the release lever 32 is adjusted according to the current setting value. , An adjustment dial 37 that is attached to the upper part of the auxiliary case 8 so as to be swingable and operated by the user. , One side comes into contact with the adjustment dial 37 and the other side is hingedly supported by the auxiliary case 8. , The adjustment link 34 connected to the hinge shaft 62 of the release lever 32, and the adjustment link 34 The adjustment link 34 is housed between the rack 34 and the auxiliary case 8 to maintain a predetermined position. And a plate spring 39 for applying elastic force.

[0032]   In addition, the plate spring 39 is an auxiliary member attached to the rear of the auxiliary case 8. It is attached to the inner wall surface of the auxiliary cover 41 and bent so that it contacts one surface of the adjustment link 34. It is formed in a curved flat plate shape.

[0033]   At this time, a gap with the plate spring 39 is formed on the inner wall surface of the auxiliary cover 41. In order to minimize the space, a predetermined height is projected on the opposite surface of the plate spring 39. The protrusion 45 is formed, and the protrusion 45 and the plate spring 39 are about 0.2 mm. A predetermined height so as to maintain the interval M of.

[0034]   Therefore, when the plate spring 39 is assembled, it is formed on the auxiliary cover 41. Maintaining a spacing M of about 0.2 mm between the plate spring 39 facing the protruding portion 45 and Therefore, if a shock or vibration occurs in the equipment, the plate spring 39 Swing within m to prevent malfunction of the device and adjust the adjustment dial 37. The set value can be accurately transmitted to the release lever 32.

[0035]   The adjustment mechanism 35 as described above is used for the trip current value of the device initially set by the user. When the adjustment dial 37 is turned by a predetermined amount in order to adjust the Is moved by turning the adjustment dial 37, and the release lever 32 The trip current value of the device is adjusted while changing the position of the shaft.

[0036]   At this time, the elastic force of the plate spring 39 stabilizes the adjustment link 34. The plate spring 39 is supported by the auxiliary cover 41. Since the distance between and is maintained at about 0.2 mm, the vibration due to shock and vibration of the equipment is 0.2 mm. Within the range, the adjustment value of the adjustment dial 37 is transmitted to the release lever 32 more accurately. Can be reached

[0037]

[Effect of device]

  As described above, in the thermal overload relay for open phase protection according to the present invention, A plate protruding from the inner wall surface of the auxiliary cover by a predetermined height By minimizing the distance from the spring, the play and The adjustment value of the adjustment dial is released to minimize swinging of the spring. Improves reliability of equipment operation by ensuring accurate transmission to the bar There is an effect.

[0038]   Also, the connection protrusion of the release lever was inserted into the connection hole of the temperature compensation bimetal. After that, the assembly is completed by inserting the stop ring, so the assembly process is simple. The rise time can be shortened, and in particular, the upper end of the temperature compensation bimetal is The temperature-compensating bimetal can be moved in the left-right direction by fitting it to the locking protrusion of the lever. There is an effect that it is possible to prevent swinging.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the construction of a thermal overload relay for open phase protection according to the present invention.

FIG. 2 is a perspective view showing a fastening state of a release lever and a temperature compensating bimetal of the thermal overload relay for open phase protection according to the present invention.

FIG. 3 is a front view showing a fastening state of a release lever and a temperature compensating bimetal of the thermal overload relay for open phase protection according to the present invention.

FIG. 4 is a side view showing a fastened state of a release lever and a temperature compensating bimetal of a thermal overload relay for phase loss protection according to the present invention.

FIG. 5 is a side view showing a switching mechanism of a thermal overload relay for open phase protection according to the present invention.

FIG. 6 is a vertical cross-sectional view showing the configuration of a conventional thermal overload relay for open-phase protection.

FIG. 7 is a sectional view showing a fastening structure of a release lever and a temperature compensating bimetal of a conventional thermal overload relay for phase loss protection.

FIG. 8 is a front view showing a switching mechanism of a conventional thermal overload relay for open phase protection.

FIG. 9 is a side view showing a switching mechanism of a conventional thermal overload relay for open phase protection.

[Explanation of symbols]

2… Case 4 ... Terminal 6 ... Actuator 8… Auxiliary case 10 ... Switching mechanism 12 ... shifter 14 ... Bimetal 16… Heating coil 20 ... Upper shifter 22 ... Lower shifter 24 ... Shift lever 30… Temperature compensation bimetal 32 ... Release lever 34… Adjustment link 35 ... Adjustment mechanism 36 ... Switching mechanism 37 ... Adjustment dial 38 ... Reset button 39 ... Plate spring 40 ... Inversion spring 41 ... Auxiliary cover 42 ... 1st movable contact 44 ... First fixed contact 45 ... Protrusion 46 ... 2nd movable contact 48 ... Second fixed contact 60… Connection hole 62 ... Hinge hole 64 ... Latching protrusion 66… Connection protrusion 67 ... Insert 68 ... Stop ring

Claims (3)

[Scope of utility model registration request] 1. A release lever engaged with a temperature compensating bimetal so as to transmit the operation of an actuator to a switching mechanism when an overcurrent or open phase occurs, and a release center housed inside an auxiliary case. A thermal overload relay for phase loss protection, which is configured to include an adjusting mechanism that is connected to a point and moves the swing center point of the release lever according to a change in the operating current set value, wherein the adjusting mechanism is , Engaging between an adjustment dial operated by the user and connected to the hinge shaft in the hinge hole of the release lever, and the adjustment link and an auxiliary cover mounted on the rear surface of the auxiliary case. A plate spring for applying a predetermined elastic force to the adjustment link is included, and an inner wall surface of the auxiliary cover is provided with the plate spring. To minimize between, phase loss for thermally activated overload relay, which comprises protruding projections. 2. The thermal type for phase loss protection according to claim 1, wherein the protrusion has a predetermined height so as to maintain a space of about 0.2 mm from the plate spring. Overload relay. 3. The release lever is formed with a connection protrusion into which a connection hole formed in the temperature compensation bimetal is inserted, and the connection protrusion maintains a connection force with the temperature compensation bimetal. A stop ring is fitted to the upper end of the temperature-compensating bimetal so as to prevent the temperature-compensating bimetal from swinging. 2. The thermal overload relay for phase loss protection according to claim 1, characterized in that each of the engaging projections is inserted into and engaged with each other.