JP2006269177A - Circuit parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit parts in which even a protruding part of a cabinet in which an outer connection terminal is constituted is included in a heat-shrinkable insulating pipe and in which insulation characteristics can be improved. <P>SOLUTION: A motor protector 100a which is the circuit parts is installed on an electric current passage to supply the electric current to a motor which is a control object, controls supply of the electric current to the motor, and has the protruding part 143-1 constituted in a side face of a base 140a, the outer part connection terminal 144-1 constituted of the protruding part 143-1 and electrically connected to an arm 120 constituting a circuit in the base 140a, a conductive wire 152-1 of which the tip is connected to the outer connection terminal 144-1, and the heat shrinkable insulating pipe 160-1 which includes a connection part of the outer connection terminal 144-1 and the conductive wire 152-1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a circuit component that conducts a circuit in a casing by being electrically connected to the outside via an external connection terminal configured on any surface of the casing.

  Conventionally, in a motor used for a compressor or the like, when the internal motor rotor is restrained for some reason or an overload is applied to the motor rotor, the temperature rises and the motor is damaged. In order to prevent this, a motor protector is used (see, for example, Patent Documents 1 to 3).

In such a conventional motor protector, a circuit for controlling current supply to the motor rotor is provided in a housing constituted by a base and a cover, and an external connection terminal electrically connected to the circuit is provided. Constructed on the side of the base. The external connection terminal is connected to the tip of the conductive wire. The connection portion between the external connection terminal and the conductive wire is enclosed by an insulating pipe having heat shrinkability (heat shrinkable insulating pipe). Thereafter, the heat-shrinkable insulating pipe is heated and contracts, so that the inner wall surface of the heat-shrinkable insulating pipe and the outer peripheral surface of the connection portion between the external connection terminal and the conductive wire are in close contact with each other, ensuring insulation. Figured.
JP-A-10-308150 JP 2000-166181 A JP 2003-328939 A

  However, the conventional motor protector has a problem in that it is difficult to ensure insulation because the end of the base side of the external connection terminal is exposed due to shrinkage of the heat-shrinkable insulating pipe during heating. In particular, when a plurality of external connection terminals are arranged adjacent to each other and a conductive wire is connected to each external connection terminal, the external connection terminals may be short-circuited due to adhesion of conductive dust or the like. There is sex.

  Therefore, an object of the present invention is to provide a circuit component having improved insulation.

  The circuit component of the present invention includes a housing, a circuit configured in the housing, a protrusion configured on any surface of the housing, and the protrusion, and is electrically connected to the circuit. An external connection terminal to be connected; a conductive wire whose tip is connected to the external connection terminal; the protrusion; and a heat-shrinkable insulating pipe that includes a connection portion between the external connection terminal and the conductive wire. Have.

  With this configuration, the heat-shrinkable insulating pipe not only includes the connection portion between the external connection terminal and the conductive wire formed in the protrusion of the housing, but also includes the protrusion. For this reason, even if the heat-shrinkable insulating pipe shrinks due to heating, the end of the external connection terminal on the protruding portion side is prevented from being exposed, and the insulation is improved.

  In addition, the circuit component of the present invention has an insulating material that covers the conductive wire so that the tip is exposed, and the heat-shrinkable insulating pipe encloses the insulating material.

  With this configuration, not only the portion of the conductive wire exposed from the insulating material but also the insulating material is included. For this reason, even if the heat-shrinkable insulating pipe shrinks due to heating, the conductive wire is prevented from being exposed, and the insulation is improved.

  In the circuit component of the present invention, the circuit includes a conductive arm provided on a current path that supplies current to the motor rotor, a bimetal that performs a reversing operation according to its own temperature, and a current path on the current path. A motor having a fixed contact provided and a movable contact provided on the conductive arm and contacting the fixed contact when the bimetal is in a non-inverted state and spaced apart from the fixed contact when the bimetal is in an inverted state It is a protector.

  In the circuit component according to the present invention, the protrusions of the casing in which the external connection terminals are formed are also included in the heat-shrinkable insulating pipe, and the insulating properties can be improved.

  FIG. 1 is an exploded perspective view of a first motor protector according to an embodiment of a circuit component of the present invention, and the first motor protector will be described below with reference to the drawings. The top view and side view of FIG. 2 are shown in FIG. 2 (FIG. 2A is a top view, and FIGS. 2B and 2C are side views). The motor protector 100a shown in FIGS. 1 and 2 is provided on a current path that supplies current to a motor (not shown) that is a control target, and controls current supply to the motor.

  The motor protector 100a includes a cover 110, an arm 120, a bimetal disk 130, a base 140a, wire leads 150-1 and 150-2 (hereinafter, these wire leads 150-1 and 150-2 are collectively referred to as “wire leads 150” as appropriate. And heat-shrinkable insulating pipes 160-1 and 160-2 (hereinafter, these heat-shrinkable insulating pipes 160-1 and 160-2 are collectively referred to as “heat-shrinkable insulating pipe 160” as appropriate). The

  The cover 110 and the base 140a constitute a housing, and the arm 120 and the bimetal disk 130 are disposed therein. The cover 110 and the base 140a have insulating properties.

  The arm 120 has conductivity and is disposed below the cover 110. At one end of the arm 120, through holes 122-1 and 122-2 (hereinafter, these through holes 122-1 and 122-2 are collectively referred to as “through holes 122”) are formed. A movable contact 124 is attached to the lower surface of the other end of the arm 120. Further, a protrusion 126 is attached to the lower surface of the arm 120 closer to the center than the attachment position of the movable contact 124.

  The bimetal disk 130 is disposed below the arm 120. The bimetal disk 130 is obtained by bonding two types of metal pieces having different thermal expansion coefficients on top and bottom, and has conductivity. Further, through holes 132-1 and 132-2 (hereinafter, these through holes 132-1 and 132-2 are collectively referred to as “through holes 132” as appropriate) are formed at one end of the bimetal disk 130.

  The bimetal disk 130 is normally in a state where the center part is curved upward (non-inverted state) by forming. On the other hand, when the ambient temperature rises and the temperature of the bimetal disk 130 becomes equal to or higher than a predetermined temperature (operation temperature), the bimetal disk 130 is caused by the difference in thermal expansion coefficient between the two types of metal pieces. The center portion is bent downward (inverted state). After that, when the temperature of the bimetal disk 130 decreases and becomes equal to or lower than a predetermined temperature (recovery temperature) lower than the operating temperature, the bimetal disk 130 is again in a state where the central portion is curved upward (non-inverted state). )

  The base 140a accommodates the above-described arm 120 and bimetal disk 130 so that the arm 120 is on the upper side and the bimetal disk 130 is on the lower side. Protrusions 142-1 and 142-2 (hereinafter, these projecting parts 142-1 and 142-2 are collectively referred to as “projections 142”) are formed on the upper surface of one end of the base 140 a. A terminal 145 is formed around the protrusions 142-1 and 142-2.

  The protrusion 142-1 is fitted into the through-hole 122-1 formed in the arm 120 and the through-hole 132-1 formed in the bimetal disk 130, and the protrusion 142-2 is a through-hole formed in the arm 120. The holes 122-2 and the through holes 132-2 formed in the bimetal disk 130 are fitted. Thus, the upper surface of the terminal 145 and the lower surface of the bimetal disk 130 are in contact with each other, and the upper surface of the bimetal disk 130 and the lower surface of the arm 120 are in contact with each other, so that the terminals 145, the bimetal disk 130 and the arm 120 are electrically connected.

  A fixed contact 146 is formed on the upper surface of the other end of the base 140a.

  Further, protrusions 143-1 and 143-2 (hereinafter, these protrusions 143-1 and 143-2 are collectively referred to as “protrusion 143” as appropriate) are adjacent to the side surface of one end of the base 140a. Is done. An external connection terminal 144-1 is configured at the tip of the projection 143-1, and an external connection terminal 144-2 is configured at the tip of the projection 143-2 (hereinafter, these external connection terminals 144-1 and 144-2 are collectively referred to as “external connection terminal 144” as appropriate).

  The external connection terminal 144-1 is electrically connected to the fixed contact 146 via a conductive base plate 147. On the other hand, the external connection terminal 144-2 is electrically connected to the terminal 145. As described above, since the terminal 145, the bimetal disk 130, and the arm 120 are electrically connected, the external connection terminal 144-2 is electrically connected to the arm 120.

  Further, the wire lead 150-1 is connected to the external connection terminal 144-1. The wire lead 150-1 includes a conductive wire 152-1 and an insulating material 154-1 coated around the conductive wire 152-1. One end of the conductive wire 152-1 is exposed from the insulating material 154-1, and the exposed portion is connected to the external connection terminal 144-1 by welding. Thereby, the electrical connection between the external connection terminal 144-1 and the conductive wire 152-1 is achieved. Similarly, to the external connection terminal 144-2, a wire lead 150-2 configured by a conductive wire 152-1 and an insulating material 154-2 coated around the conductive wire 152-2 is connected. . One end of the conductive wire 152-2 is exposed from the insulating material 154-2, and the exposed portion is connected to the external connection terminal 144-2 by welding. Thereby, electrical connection between the external connection terminal 144-2 and the conductive wire 152-2 is achieved.

  The heat-shrinkable insulating pipe 160-1 is attached so as to include a connection portion between the external connection terminal 144-1 and the conductive wire 152-1, the protruding portion 143-1, and a part of the insulating material 154-1. . FIG. 3 is a diagram illustrating a state in which the heat-shrinkable insulating pipe 160-1 is attached.

  Again, referring back to FIG. 1 and FIG. Similar to the heat-shrinkable insulating pipe 160-1, the heat-shrinkable insulating pipe 160-2 has a connection portion between the external connection terminal 144-2 and the conductive wire 152-2, a protrusion 143-2, and an insulating material 154-. It attaches so that a part of 2 may be included.

  The heat-shrinkable insulating pipe 160-1 is heated in a state of including a connection portion between the external connection terminal 144-1 and the conductive wire 152-1, the protruding portion 143-1, and a part of the insulating material 154-1. To shrink. As a result, the outer peripheral surface of the connection portion between the external connection terminal 144-1 and the conductive wire 152-1, the outer peripheral surface of the protrusion 143-1, and the outer peripheral surface of a part of the insulating material 154-1, heat shrinkage The inner wall surface of the insulating pipe 160-1 is in close contact. For this reason, the connection portion between the external connection terminal 144-1 and the conductive wire 152-1 is entirely exposed to the heat-shrinkable insulating pipe 160-1 and is not exposed.

  Similarly, the heat-shrinkable insulating pipe 160-2 includes a connection portion between the external connection terminal 144-2 and the conductive wire 152-2, a protruding portion 143-2, and a part of the insulating material 154-2. Shrinks when heated with As a result, the outer peripheral surface of the connection portion between the external connection terminal 144-2 and the conductive wire 152-2, the outer peripheral surface of the protrusion 143-2, and the outer peripheral surface of a part of the insulating material 154-2, heat shrinkage. The insulating pipe 160-2 is in close contact with the inner wall surface. For this reason, the connection part of the external connection terminal 144-2 and the conductive wire 152-2 is entirely exposed to the heat-shrinkable insulating pipe 160-2 and is not exposed.

  In order to prevent the connection portion between the external connection terminal 144-1 and the conductive wire 152-1 from being exposed when the heat-shrinkable insulating pipe 160-1 is shrunk by heating, the heat-shrinkable insulating pipe 160 is not exposed. When attaching -1, it is preferable to make the overlapping portion between the protrusion 143-1 and the insulating material 154-1 longer. Similarly, in order to prevent the connection portion between the external connection terminal 144-2 and the conductive wire 152-2 from being exposed when the heat-shrinkable insulating pipe 160-2 is shrunk by heating, the heat-shrinkable insulating pipe is used. At the time of attaching 160-2, it is preferable to make the overlapping portion between the protrusion 143-2 and the insulating material 154-2 longer.

  Next, the operation of the motor protector 100a will be described. FIG. 4 is a diagram illustrating the operation of the motor protector 100a. When the motor to be controlled by the motor protector 100a is in a normal state, as shown in FIG. 4A, the bimetal disk 130 in the motor protector 100a is curved in the upper part and is in a non-inverted state. Yes. The movable contact 124 attached to the arm 120 is in contact with the fixed contact 146. Therefore, the conductive wire 152-1 of the wire lead 150-1 and the conductive wire 152-2 of the wire lead 150-2 are the external connection terminal 144-1, the base plate 147, the fixed contact 146, the movable contact 124, the arm 120, Electrical connection is achieved through the bimetal disk 130, the terminal 145, and the external connection terminal 144-2, the current path is conducted, and current is supplied to the motor.

  On the other hand, when the motor rotor in the motor is constrained or when an overload is applied to the motor rotor and the amount of current increases, the ambient temperature around the bimetal disk 130 due to heat generated by the motor rotor is reduced. As the temperature rises, the temperature of the bimetal disk 130 rises. When the temperature of the bimetal disk 130 becomes equal to or higher than the operating temperature, the bimetal disk 130 changes from the non-inverted state to the flat state as shown in FIG. ), The center part is in an inverted state curved downward.

  When the bimetal disk 130 is reversed, the upper surface of the bimetal disk 130 presses the protrusion 126 attached to the lower surface of the arm 120 upward. As a result, the movable contact 124 attached to the lower surface of the arm 120 is separated from the fixed contact 146. For this reason, the electrical connection between the conductive wire 152-1 of the wire lead 150-1 and the conductive wire 152-2 of the wire lead 150-2 is cut off, the current path becomes non-conductive, and the current supply to the motor stops. To do.

  Thus, in the motor protector 100a, the heat-shrinkable insulating pipe 160 has a connection portion between the external connection terminal 144 and the conductive wire 152, a protrusion 143 on one end side of this connection portion, and an insulating material 154 on the other end side. It is attached so that it may contain a part of, and shrinks by heating. For this reason, the connection portion between the external connection terminal 144 and the conductive wire 152 is not exposed because it is entirely covered with the heat-shrinkable insulating pipe 160, and the insulation of the connection portion can be improved.

  FIG. 5 is an exploded perspective view of the second motor protector according to the embodiment of the circuit component of the present invention, FIG. 6 is a top view and a side view of the motor protector (FIG. 6 (a) is a top view, FIG. 6 (b)). And (c) is a side view). The motor protector 100b shown in FIGS. 5 and 6 includes a PTC thermistor 135 on the lower surface of the bimetal disk 130, as compared with the motor protector 100a.

  In addition, a protrusion 143-1 is formed on the side surface of one end of the base 140b, and a protrusion 143-2 is formed on the side surface of the other end. As with the motor protector 100a, an external connection terminal 144-1 is configured at the tip of the projection 143-1, and an external connection terminal 144-2 is configured at the tip of the projection 143-2. The external connection terminal 144-1 is electrically connected to the terminal 145. On the other hand, the external connection terminal 144-2 is electrically connected to the fixed contact 146 via the base plate 147.

  A wire lead 150-1 is connected to the external connection terminal 144-1. The wire lead 150-1 includes a conductive wire 152-1 and an insulating material 154-1 coated around the conductive wire 152-1. One end of the conductive wire 152-1 is exposed from the insulating material 154-1, and the exposed portion is connected to the external connection terminal 144-1 by welding. Similarly, to the external connection terminal 144-2, a wire lead 150-2 configured by a conductive wire 152-1 and an insulating material 154-2 coated around the conductive wire 152-2 is connected. . One end of the conductive wire 152-2 is exposed from the insulating material 154-2, and the exposed portion is connected to the external connection terminal 144-2 by welding.

  The heat-shrinkable insulating pipe 160-1 is attached so as to enclose a connection portion between the external connection terminal 144-1 and the conductive wire 152-1, a protruding portion 143-1, and a part of the insulating material 154-1. It is done. When the heat-shrinkable insulating pipe 160-1 is heated, the outer peripheral surface of the connection portion between the external connection terminal 144-1 and the conductive wire 152-1, the outer peripheral surface of the protrusion 143-1, and the insulating material 154- A part of the outer peripheral surface of 1 and the inner wall surface of the heat-shrinkable insulating pipe 160-1 are in close contact. For this reason, the connection part of the external connection terminal 144-1 and the conductive wire 152-1 is entirely exposed to the heat-shrinkable insulating pipe 160-1 and is not exposed, and insulation is ensured.

  Similarly, the heat-shrinkable insulating pipe 160-2 includes a connection portion between the external connection terminal 144-2 and the conductive wire 152-2, the protruding portion 143-2, and a part of the insulating material 154-2. Attached to. When the heat-shrinkable insulating pipe 160-2 is heated, the outer peripheral surface of the connection portion between the external connection terminal 144-2 and the conductive wire 152-2, the outer peripheral surface of the protrusion 143-2, and the insulating material 154- 2 and the inner wall surface of the heat shrinkable insulating pipe 160-2 are in close contact with each other. For this reason, the connection portion between the external connection terminal 144-2 and the conductive wire 152-2 is entirely exposed to the heat-shrinkable insulating pipe 160-2 and is not exposed, and insulation is ensured.

  In addition to the above-described configuration, various configurations of the motor protector are conceivable. For example, a configuration in which the motor protector 100a includes the PTC thermistor 135 or a configuration in which the PTC thermistor 135 in the motor protector 100b is removed may be employed.

  In the above-described embodiment, the motor protector as the circuit component has been described. However, the present invention can be similarly applied to other circuit components other than the motor protector.

  As described above, the circuit component according to the present invention can improve insulation and is useful as a circuit component.

It is a disassembled perspective view of a 1st motor protector. It is the upper side figure and side view of a 1st motor protector. It is a figure which shows the attachment state of an insulating pipe. It is a figure which shows operation | movement of a 1st motor protector. It is a disassembled perspective view of a 2nd motor protector. It is the upper side figure and side view of a 2nd motor protector.

Explanation of symbols

100a, 100b Motor protector 110 Cover 120 Arm 122-1, 122-2, 132-1, 132-2 Through hole 124 Movable contact 126, 142-1, 142-2, 143-1, 143-2 Protrusion 130 Bimetal Disk 135 PTC thermistor 140a, 140b Base 144-1, 144-2 External connection terminal 145 Terminal 146 Fixed contact 147 Base plate 150-1, 150-2 Wire lead 152-1, 152-2 Conductive wire 154-1, 154-2 Insulating material 160-1, 160-2 heat shrinkable insulating pipe

Claims (3)

A housing,
A circuit configured in the housing;
A protrusion configured on any surface of the housing;
An external connection terminal configured on the protrusion and electrically connected to the circuit;
A conductive wire whose tip is connected to the external connection terminal;
A circuit component comprising: the projecting portion; and a heat-shrinkable insulating pipe that encloses a connection portion between the external connection terminal and the conductive wire. Having an insulating material covering the conductive wire so that the tip is exposed;
The circuit component according to claim 1, wherein the heat-shrinkable insulating pipe encloses the insulating material. The circuit is
A conductive arm provided on a current path for supplying a current to the motor rotor;
Bimetal that performs reversal operation according to its own temperature,
A fixed contact provided on the current path;
The movable contact provided on the conductive arm and contacting the fixed contact when the bimetal is in a non-inverted state, and moving away from the fixed contact when the bimetal is in an inverted state. The circuit component according to 1 or 2.

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