JP6584643B2 - Electrical box for terminal block and air conditioner - Google Patents

Description

  The present invention relates to a terminal block and an electrical component box for an air conditioner, and more particularly to a structure of a relay terminal block that is fixed to the electrical component box provided in the air conditioner by screws.

  A relay terminal block is installed to relay communication with a power line for supplying power to the air conditioner or with an indoor unit, an outdoor unit, and a remote controller (hereinafter referred to as a remote controller). In the relay terminal block installed in the air conditioner, in recent years, for the purpose of energy saving, there is a trend toward downsizing of an electrical component box in which the relay terminal block is incorporated in order to expand the air path.

  There are various types of air conditioner indoor units. For example, a four-way cassette type indoor unit rotates an air blower connected to the motor shaft by driving an electric motor installed in the casing of the indoor unit. By doing so, indoor air is sucked in through the bell mouth installed in the housing, and the air heat-exchanged by the heat exchanger is blown out into the room. The bell mouth is a bell-shaped cylinder and is a member used for smoothing the air flow. In this type of indoor unit, an electrical component box that houses a control board for controlling the operation of the indoor unit is often arranged on the lower side of the indoor unit. In addition, a terminal block for electrically connecting the indoor unit and the outdoor unit, a terminal block for electrically connecting the outdoor unit and the remote control, and a power line for supplying power to the indoor unit are connected. The terminal block to be installed is installed.

  A variety of short-circuit prevention structures have been disclosed along with miniaturization of an electrical component box in which a relay terminal block is incorporated. For example, Patent Document 1 discloses a terminal block in which walls between terminals are projected. The terminal block of Patent Document 1 includes a main body formed of a rectangular parallelepiped block having a U-shaped cross section, a plurality of terminal mounting plates that are integrally formed on the upper surface of the recessed portion of the main body, and each have two mounting screws. It is comprised from the hollow part upper surface and the spacer which protruded and provided from the main body side surface for insulating between these terminal mounting plates.

Japanese Utility Model Publication No. 63-137471

  However, when the terminal block structure of Patent Document 1 is used for an air conditioner, there are the following problems. The relay terminal block mounted on the air conditioner is often provided in a metal electrical box together with the control board, and the electrical box is grounded by local wiring. Therefore, when an external force is applied to the terminal part during product assembly or on-site installation, the terminal of the current-carrying part may come into contact with the electrical component box surrounded by the metal connected to the ground, resulting in a ground fault. In addition, when the terminal portion is deformed by an external force, there is a problem that a safety distance cannot be secured.

  The present invention has been made in view of the above, and an object of the present invention is to obtain a terminal block capable of ensuring a safety distance between terminals even when an external force is applied to the terminals or when the terminals are deformed. To do.

In order to solve the above-described problems and achieve the object, the present invention provides a terminal block fixed to a metal-covered electrical component box with screws, and a primary-side terminal portion to which a primary-side wiring is connected. And a bottom side, a primary side support portion that is positioned on the primary terminal portion side and rises from the bottom portion to a certain height, and a guide wall that rises from the bottom portion at a position spaced apart from the primary side support portion. and, a terminal block body having a secondary terminal unit that the secondary side wiring is connected, one end of which is fixed by screws to said primary terminal portion, the conductive plate is the other end is connected to the secondary side wiring With lead terminals . The lead terminal with a conductive plate to which the secondary side wiring is connected is supported at two points on the secondary side terminal portion by the primary side support portion and the guide wall .

  According to the present invention, it is possible to obtain a terminal block that can ensure a safe inter-terminal distance even when an external force is applied to the terminal or when the terminal is deformed.

The perspective view which shows the external appearance of the terminal block of Embodiment 1 The principal part expansion explanatory drawing which shows the lead terminal with an electroconductive board in the terminal block of Embodiment 1 Top view of terminal block of embodiment 1 The right view of the terminal block of Embodiment 1 It is sectional drawing of the terminal block of Embodiment 1, and is VV sectional drawing of FIG. The figure which shows the air conditioner which concerns on Embodiment 1 typically. The figure which looked at the case of the indoor unit which removed the decorative panel shown in Drawing 6 from the undersurface side Interior view of electrical component box according to Embodiment 1 The perspective view which shows the external appearance of the terminal block of Embodiment 2. Top view of terminal block of embodiment 2 The right side view of the terminal block of Embodiment 2 FIG. 11 is a cross-sectional view of the terminal block according to the second embodiment, and is a cross-sectional view taken along the line XII-XII in FIG.

  Embodiments of a terminal block and an air conditioner electrical component box according to the present invention will be described below in detail with reference to the drawings. It should be noted that the present invention is not limited by the embodiment, and can be appropriately changed without departing from the gist of the present invention. In the drawings shown below, the scale of each member may be different from the actual scale for easy understanding. The same applies between the drawings. Further, even a plan view may be hatched to make the drawing easy to see. On the other hand, even a cross-sectional view may not be hatched for easy viewing of the drawing.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing the appearance of a relay terminal block for relaying power or communication to the air conditioner of Embodiment 1, and FIG. 2 is a lead terminal with a conductive plate in the terminal block of Embodiment 1. FIG. 3 is a top view of the terminal block according to the first embodiment, FIG. 4 is a right side view of the terminal block according to the first embodiment, and FIG. 5 is a terminal block according to the first embodiment. FIG. 4 is a cross-sectional view taken along the line VV in FIG. 3. In the terminal block 10 according to the first embodiment, a guide wall 13 for leading out lead terminals is arranged on a resin terminal block main body 11. A lead terminal 12 with a conductive plate in which a conductive plate and a lead terminal are integrated is used as the lead terminal. A guide wall in which the connection portion 12c between the end portion of the lead terminal 12 with the conductive plate and the communication cable 16 has a height H from the bottom portion 11B of the terminal block body 11 equal to or higher than the connection portion 12c. 13 is derived. One end of the lead terminal 12 with the conductive plate is connected to the communication cable 16 that is the secondary wiring, and the power cable 17 that is the primary wiring is connected to the primary side via the conductive plate 12a of the lead terminal 12 with the conductive plate. Configure the terminal part. The communication cable 16 is led out from the bottom of the terminal block body 11 at a certain height by the guide wall 13 formed integrally with the terminal block body 11. The terminal block main body 11 and the guide wall 13 are integrally formed resin moldings.

  The terminal block 10 according to the first embodiment is fixed to a metal electrical component box 20 provided in the air conditioner 1 with screws, and a terminal block for relaying with local wiring and a control board of the air conditioner 1 are provided. And a function of relaying connection lines to be relayed.

  In the terminal block 10, a lead terminal 12 with a conductive plate constituting a secondary wiring portion is attached to a terminal block main body 11, and a power cable 17 and a lead terminal with a conductive plate constituting a primary wiring portion by a conductive plate 12a. 12 are electrically connected. Primary side terminal portions each having a terminal screw 15 are attached to the conductive plate 12a. By fastening the terminal screw 15, the power cable 17 constituting the primary wiring part and the communication cable 16 constituting the secondary wiring part are fixed to the lead terminal 12 with the conductive plate. As a result, the conductive plate 12a is electrically connected to the primary side wiring portion and the secondary side wiring portion.

  A mounting hole 14 is formed in the central portion of the terminal block body 11 made of a resin molded body, and the terminal block 10 is mounted on an electrical component box 20 to be described later with a terminal block mounting screw 18.

  In the primary side terminal portion, the primary side crimp terminal 17S and the conductive plate 12a are fastened by the terminal screw 15 via the washer 15W. The primary side crimp terminal 17S is connected to the power cable 17 by crimping via a crimp tube (not shown). On the other hand, the lead terminal 12 with the conductive plate is connected to the communication cable 16 at the secondary terminal portion.

  As shown in FIG. 2, the lead terminal 12 with the conductive plate includes a conductive plate 12a at the tip provided with a terminal hole 12d through which the terminal screw 15 is inserted, a lead terminal main body 12b, a communication cable, and a communication cable. And a connection portion 12 c for connecting to the terminal 16. The connecting portion 12c forms a wide portion, and the lead terminal 12 with the conductive plate and the communication cable 16 are connected by caulking a core wire (not shown) of the communication cable 16 with the wide portion.

  FIG. 6 is a diagram schematically illustrating the air conditioner 1 using the terminal block 10 according to the first embodiment. The air conditioner 1 includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 is a four-way cassette type indoor unit, but is not limited thereto. A remote control 400 is connected to the indoor unit 100 via a remote control communication wiring 500, and the indoor unit 100 is connected to the outdoor unit 200 via an indoor / outdoor communication wiring 300. Information is transmitted between the remote control 400 and the indoor unit 100 via the remote control communication wiring 500.

  A decorative panel 102 is attached to the lower surface of the casing 101 of the indoor unit 100, an indoor air suction port 103 is provided at the center of the decorative panel 102, and a discharge port 104 is provided around the suction port 103. Yes.

  FIG. 7 is a view of the casing 101 of the indoor unit 100 from which the decorative panel 102 illustrated in FIG. 6 is removed as viewed from the lower surface side. As illustrated, the housing 101 includes a bell mouth 105 provided at a position facing the suction port 103 of the decorative panel 102 and a plurality of discharge ports 104i provided at a position facing the discharge port 104 of the decorative panel 102. And an electrical component box 20 installed between the discharge port 104 i and the bell mouth 105. The housing 101 is provided with a blower (not shown), a heat exchanger (not shown) provided around the blower, and the like, which sucks room air through the bell mouth 105 and discharges the air through the discharge port 104i.

  In the electrical component box 20, one long side surface, that is, the inner side surface 20 b, which is the surface on the bell mouth 105 side, is outside the edge of the bell mouth 105 opening so as not to block the opening of the bell mouth 105 Is located. In addition, the other long side surface of the electrical component box 20, that is, the outer surface 20a that is the surface on the discharge port 104i side is configured to be located closer to the center than the edge of the discharge port 104i, and the lower surface faces the decorative panel 102. Installed in the housing 101. With the above configuration, the indoor air that has passed through the suction port 103 of the decorative panel 102 is sucked into the bell mouth 105 without being blocked by the inner surface 20 b of the electrical component box 20.

  FIG. 8 is an interior view of the electrical component box 20 according to the first embodiment. FIG. 8 shows an example of components incorporated in the electrical component box 20. The electrical component box 20 includes a control board 32 on which a drive circuit for driving a blower motor mounted in the indoor unit 100 is mounted. And a terminal block 10 which constitutes a terminal block for relaying power and indoor / outdoor wiring. The electrical component box 20 is also provided with a communication wiring terminal block, which is not shown here. Fixing members 33 a and 33 b for fixing a lid (not shown) that closes the opening surface of the electrical component box 20, that is, the surface facing the decorative panel 102, are formed in the casing of the electrical component box 20.

  The terminal block 10 is screwed to the casing of the electrical component box 20 between one short side surface 20 c of the casing of the electrical component box 20 and the control board 32. The primary side terminal of the terminal block 10 is connected to, for example, the power cable 17 drawn from the wiring introduction port 22 formed on the short side surface 20 c of the electrical component box 20. The power cable 17 is, for example, a wiring for single-phase three-wire 200V. A wiring to the control board 32 is connected to the secondary side terminal of the terminal block 10 and, for example, an S1 terminal to which the ground line of the power cable 17 is connected and one power line of the power cable 17 shown in FIG. The indoor / outdoor communication wiring 300 shown in FIG. 6 is connected to the S2 terminal to which is connected or the S3 terminal to which the other power line of the power cable 17 is connected. As described above, the outdoor unit 200 and the indoor unit 100 are connected.

  The wiring connected to the communication cable 16 that is the secondary terminal is electrically connected to a primary winding (not shown) of the power transformer 23 installed on the control board 32. A secondary winding (not shown) of the power transformer 23 is electrically connected to a converter circuit (not shown) mounted on the control board 32. In FIG. 8, the left side area on the primary side winding side of the control board 32 from the power transformer 23 is defined as a primary side area, and the right side area on the secondary side winding side of the control board 32 from the power transformer 23 is illustrated. The secondary region is used.

  The terminal block 10, which is a communication wiring terminal block, is installed in the secondary region of the control board 32 with respect to the power transformer 23, and is installed on the other short side surface 20 c of the electrical component box 20. The terminal block 10 is connected with, for example, a remote control communication wiring 500 drawn from a wiring introduction port 22 formed on the short side surface 20c.

  Hereinafter, the operation of the air conditioner will be described. The commercial power supplied from the power cable 17 is converted to DC power by a converter circuit (not shown) mounted on the control board 32, and the converted DC power is converted to AC power by an inverter circuit (not shown). Supplied to the electric motor. When the blower connected to the shaft of the electric motor rotates, room air is sucked from the suction port 103 of the decorative panel 102. The room air that has passed through the suction port 103 is introduced into the bell mouth 105 without being blocked by the inner surface 20 b of the electrical component box 20, and the air that has been heat-exchanged by the heat exchanger in the indoor unit 100 passes through the discharge port 104. Is blown out.

  As described above, in the terminal block 10 according to the first embodiment, the connection portion from the terminal block 10 to the control board 32, that is, the terminal of the energization portion and the connection line are integrally formed with the terminal portion of the relay terminal block 10. And having a function of supplying power to the air conditioner 1 by relaying local wiring. Moreover, since the electrical component box 20 made of metal is connected to the ground by local wiring, it has the same potential as the ground. Therefore, when an external force is applied to the terminal portion during assembly, installation, etc., if an external force is applied to the relay connection line, there is a risk of contact with the metal portion of the electrical component box 20 connected to the ground. A guide wall 13 having a thickness is arranged so that the communication cable 16 is led out through the guide wall 13. Therefore, even when the connecting portion from the relay terminal block 10 to the control board 32 is deformed by an external force, the terminal connecting portion between the communication cable 16 of the terminal block 10 and the lead terminal 12 with the conductive plate does not touch other metal portions. Can be. Assembling and installation in a structure in which the connecting portion from the relay terminal block 10 to the control board 32, that is, the terminal of the energizing portion and the connecting line to the control board 32 are integrally formed with the terminal portion of the relay terminal block 10 At this time, when an external force is applied to the terminal portion, it is possible to prevent a ground fault from coming into contact with the electrical component box 20 surrounded by metal connected to the ground. In addition, a safety distance can be secured.

Embodiment 2. FIG.
FIG. 9 is a perspective view showing the appearance of a relay terminal block terminal block for relaying power or communication to the air conditioner of the second embodiment, and FIG. 10 is a top view of the terminal block of the second embodiment. 11 is a right side view of the terminal block according to the second embodiment, and FIG. 12 is a cross-sectional view of the terminal block according to the second embodiment, which is a cross-sectional view taken along the line XII-XII in FIG. The terminal block 10S of the second embodiment is the same as the first embodiment in that it has a guide wall 13, but the lead terminal 12 with a conductive plate connected to the communication cable 16 that is the secondary wiring is a conductive plate. The connection between the communication cable 16 and the clip terminal 12S, which is a secondary terminal, is formed by a clip connection. In the terminal block 10S of the second embodiment, the connection between the clip terminal 12S and the communication cable 16 can also prevent ground faults without requiring an insulating coating such as an insulating sleeve. Also in the terminal block 10S of the second embodiment, the connection portion between the end portion of the clip terminal 12S as the lead terminal and the communication cable 16 is equal to or higher than the height from the bottom of the electrical component box 20. Guided through the guide wall 13. Since others are the same as the terminal block 10 and the electrical component box 20 of Embodiment 1, description is abbreviate | omitted here. In addition, the same code | symbol was attached | subjected to the same site | part. Also in the terminal block 10S of the second embodiment, the terminal block main body 11 and the guide wall 13 are integrally formed resin moldings. 10 to 12, the communication cable 16 connected to the end of the clip terminal 12S is not shown.

  Similarly to the terminal block of the first embodiment, when the external force is applied to the terminal portion during product assembly or on-site installation, the electrical box surrounded by metal connected to the ground is also provided by the terminal block of the second embodiment. Can be prevented from touching and grounding.

  The height of the guide wall is preferably about the same as or higher than the height position of the connecting portion or the conductive plate, but may be a certain height from the bottom surface of the terminal body. The height of the guide wall may be equal to or higher than a predetermined height in consideration of the cable material, thickness, connection structure, and the like.

  The terminal box main body is made of a resin molded body such as an epoxy resin, but the guide wall may be integrally formed with the terminal box main body or may be mounted separately. Further, a cable insertion groove may be formed on the upper edge of the guide wall. Formation of the groove secures the position of the cable and enables more secure fixing.

  The electrical component box may be formed of a resin molded body such as an epoxy resin, and a grounding metal may be disposed on the outside, or a metal thin film may be formed on the outside of the resin molded body. Further, it may be formed of a metal plate, and an insulating member may be arranged and mounted at a necessary place.

  In the first and second embodiments, the example in which the communication cable 16 that is the secondary wiring is led out from the bottom of the terminal block body at a constant height has been described. However, the power cable 17 that is the primary wiring is described. May be led out from the bottom by a guide wall at a certain height, and when there are connecting portions on both sides, the guide walls may be arranged on both sides.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Air conditioner 10,10S terminal block, 11 Terminal block main body, 12 Lead terminal with a conductive plate, 12a Conductive plate, 12b Lead terminal main body portion, 12c Connection portion, 12d Terminal hole, 13 Guide wall, 14 Mounting hole, 15 Terminal screw, 15W washer, 16 communication cable, 17 power cable, 18 terminal block mounting screw, 20 electrical component box, 20a outer surface, 20b inner surface, 22 wiring inlet, 23 power transformer, 32 control board, 33a, 33b fixed Member, 100 indoor unit, 200 outdoor unit, 101 housing, 102 decorative panel, 103 suction port, 104, 104i outlet, 105 bell mouth, 300 indoor / outdoor communication wiring, 400 remote control, 500 remote control communication wiring.

Claims (3)

A terminal block fixed with screws to an electrical box covered with metal,
A primary side terminal portion to which a primary side wiring is connected, a bottom portion, a primary side support portion that is located on the primary side terminal portion side and rises at a certain height from the bottom portion, and a position that is separated from the primary side support portion. A terminal block body having a guide wall rising from the bottom at a certain height and having a secondary side terminal portion to which the secondary side wiring is connected ;
One end side is fixed to the primary side terminal portion with a screw, and the other end side is connected to the secondary side wiring lead terminal with a conductive plate,
With
The terminal block, wherein the lead terminal with a conductive plate to which the secondary wiring is connected is supported at two points on the secondary terminal part by the primary side support part and the guide wall . The terminal block according to claim 1, wherein the other end side of the lead terminal with the conductive plate has a terminal portion that is caulked and connected to the secondary wiring . The terminal block according to claim 1 or 2,
A control board for controlling the air conditioner ;
With
The primary side wiring is connected to the power source side,
The electrical component box for an air conditioner , wherein the secondary wiring connects the terminal block and the control board .

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