JP2005327557A - Power connection means for case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power connection means for a sealed case allowing connection work to be easily carried out and capable of preventing wrong connection. <P>SOLUTION: This power connection means is used for connecting an external power source to hermetic tacts 6 formed on a case 1. The power connection means is provided with a case-side connector 2 mounted to the case 1 and having terminals 8 connected to the hermetic tacts 6, and a power source-side connector 4 mounted to a power cable 3 connected to the external power source and having terminals 21 connected to the terminals 8; and is so structured that the power source-side connector 4 is fitted to the case-side connector 2 to connect the terminals 8 and the terminals 21 of the respective connectors 2 and 4 to each other, whereby the external power source is connected to the hermetic tacts 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power supply connector for a case for connecting an external power supply to an electric motor housed in a case such as an electric compressor used in an air conditioner or the like while sealing.

  As a structure for connecting an electric motor housed in a case of an electric compressor and an external power source outside the case, the structure described in Patent Document 1 is known.

  This structure will be described with reference to FIG. 6. Hermetic tacts t1, t2, and t3 are attached to the upper lid k of the case that accommodates the electric motor via hermetic seals s, and the hermetic tacts t1, t2, and t3 are respectively attached. Are spot-welded for connecting terminals T1, T2 and T3 having different shapes.

  According to this structure, when the terminals T1, T2, and T3 are connected to a connection line connected to an external power source, the terminals T1, T2, and T3 can be distinguished based on the difference in shape. A predetermined connection line can be connected without error.

JP 7-245905 A

  However, in the conventional power supply connection structure, since it is necessary to prepare a plurality of terminals T1, T2, and T3 having different shapes, the number of parts increases. Further, since the connection work needs to be performed for each of the terminals T1, T2, and T3, the number of work steps increases.

  In addition, since the connection terminals T1, T2, and T3 and the connection line on the power source side are exposed, noise is diffused from the exposed portion by passing a current through the power cable. .

  Further, during the assembly work of the compressor or during the connection work between the terminals T1, T2, and T3 and the connection line, an external force may be applied to the exposed terminal by mistake, and the terminal may be deformed or damaged. .

  An object of the present invention, which was created in view of the above circumstances, is to provide a power supply connector for a case that can be easily connected and can prevent erroneous connection.

  The invention according to claim 1 devised to solve the above problem is a power connector for connecting an external power source to a hermetic tact provided in a case, the power connector being attached to the case, wherein the hermetic tact A case-side connector having a terminal connected to the external power supply, and a power-side connector attached to the power cable connected to the external power source and having a terminal connected to the terminal, the power-side connector being connected to the case-side connector The terminals of each connector are connected to each other and the external power supply is connected to the hermetic tact.

  According to a second aspect of the present invention, the case side connector and the power source side connector, when these connectors are fitted to each other, determine a relative fitting angle between the connectors so that predetermined terminals are connected to each other. It has a prevention structure.

  According to a third aspect of the present invention, the case side connector and the power source side connector each have a metal casing, and these casings contact each other when the connectors are fitted to each other, and the inside is electrically connected. Shielding.

  According to a fourth aspect of the present invention, the case-side connector includes a connector body including the terminal so as to protect the terminal of the connector from an external force, and the power-side connector protects the terminal of the connector from the external force. A connector body including the terminals is provided.

  According to a fifth aspect of the present invention, a seal member formed in an annular shape is provided between the case side connector and the power source side connector so as to prevent intrusion of water, oil, dust or the like.

According to the present invention, the following effects can be exhibited.
(1) According to the first aspect of the present invention, the external power supply can be appropriately and easily connected by fitting the power supply side connector to the case side connector. That is, since each terminal for connection is set in both connectors in advance, by connecting the connectors, an external power supply can be connected in a short time without erroneous connection, and the trouble of connecting each terminal separately can be saved. .
(2) According to the invention of claim 2, since the relative fitting angle between the connectors is determined by the erroneous connection preventing structure, the erroneous connection can be completely prevented.
(3) According to the invention of claim 3, since the terminals are covered by the metal casing by fitting the connectors together, a shielding effect is obtained.
(4) According to the invention of claim 4, since each connector body is formed so as to enclose each terminal, it is possible to prevent external force from being directly applied to the terminal, and to prevent deformation and breakage of the terminal.
(5) According to the invention of claim 5, it is possible to seal water, oil, or dust that tends to enter the interior from the outside between the connectors.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the power supply connector for a case according to the present embodiment is a case side attached to an upper lid 1 of a case (for example, a hermetic case) constituting an electric compressor (for example, a hermetic electric compressor). A connector 2 and a power supply side connector 4 attached to a power cable 3 connected to an external power source are provided.

  First, the case side connector 2 will be described.

  As shown in FIG. 1, a hermetic plate 5 is attached to the upper lid 1 of the case. As shown in FIG. 2B, the hermetic plate 5 has a plate for supplying power to the electric motor in the case. Three hermetic tacts 6 formed through 5 are insulated and attached via a glass seal 7. The hermetic plate 5 is made of a conductive metal (hereinafter referred to as metal), and the upper lid 1 and the case are also made of metal.

  A lead wire 9 to which a tab terminal (male terminal) 8 is crimped is connected to the upper end portion of each hermetic tact 6 by welding. A welded portion between the hermetic tact 6 and the lead wire 9 is provided with an insulator 10 formed in a cylindrical shape so as to cover the welded tact 6 and a short circuit between the hermetic tacts 6 is prevented.

  The tab terminal 8 is set on a case-side connector body 11 that constitutes a main part of the case-side connector 2. The case-side connector body 11 is made of resin, and insulates the tab terminals 8 and sets them at predetermined positions in predetermined directions. The case-side connector body 11 is formed so as to enclose the tab terminal 8 in order to protect the tab terminal 8 to be set from external force.

  Each tab terminal 8 is mounted on the case-side connector body 11 to determine the relative position thereof. When each hermetic tact 6 is mounted on the hermetic plate 5 via the glass seal 7, it is optimally accurate. It may not be attached to the position and may shift slightly. In this case, the lead wire 9 connecting the tab terminal 8 and the hermetic tact 6 is appropriately bent to absorb the deviation.

  In the illustrated example, the case-side connector body 11 is constituted by a male connector, and a base portion 11a that supports the base portion of each tab terminal 8 and a cylindrical socket that is integrally formed by stacking on the base portion 11a. Part 11b. Inside the socket portion 11b, the tip portion of each tab terminal 8 is accommodated in a state protruding from the base portion 11a.

  The case-side connector 2 provided with such a connector main body 11 has a metal case-side metal housing 12 formed in a cylindrical shape so as to surround a side portion of the connector main body 11. The case-side metal housing 12 houses the connector main body 11 therein and electrically shields the inside in cooperation with a power-supply side metal housing 13 described later.

  A retaining mechanism 14 is interposed between the metal housing 12 and the connector main body 11. The retaining mechanism 14 includes a stepped portion 14 a formed on the inner peripheral surface of the metal housing 12 and a claw portion 14 b formed on the side portion of the connector main body 11, and the claw portion 14 b engages with the stepped portion 14 a. Thus, the connector main body 11 is prevented from coming out of the metal casing 12 upward.

  As shown in FIG. 1, the metal casing 12 is attached to the upper lid 1 of the sealed case with bolts 15 via a hermetic plate 5. Here, since these parts are all made of metal, the metal casing 12, the hermetic plate 5, the upper lid 1 and the sealed case are electrically connected, and these jointly shield the inside electrically. become.

  As shown in FIG. 2B, a seal member (O-ring) 16 formed in a ring shape so as to surround the hermetic tact 6 is attached to the lower opening 12 a of the metal housing 12. The seal member 16 is pressed against the upper surface of the plate 5 when the metal housing 12 is placed on the upper surface of the hermetic plate 5 and the bolt 15 is tightened, and seals between the metal housing 12 and the plate 5. And prevent the ingress of water, oil or dust.

  A seal member (O-ring) 17 formed in a ring shape so as to surround the connector main body 11 is also attached to the upper opening 12 b of the metal housing 12. The seal member 17 is pressed against the power supply side connector 4 when the power supply side connector 4 to be described in detail later is fitted to the case side connector 2, and enters the inside through the space between the connectors 2 and 4 from the outside. It seals water, oil or dust.

  Next, the power supply side connector 4 will be described.

  As shown in FIG. 1, the power supply side connector 4 is attached to a power feeding cable 3 connected to an external power supply and is fitted to the case side connector 2.

  As shown in FIG. 3A, the power supply cable 3 includes three signal lines 18 each having an insulating coating layer, and a shield braid (shield) formed in a cylindrical shape so as to surround the signal lines 18. Wire) 19 and a skin 20 that covers the outer periphery of the shield braid 19, and a so-called shielded cable is used.

  The feeding cable 3 has a sheath 20 on its distal end side cut to a predetermined length, a cylindrical shield braid 19 is inverted by a predetermined length, the signal line 18 is exposed, and the covering layer at the distal end of the signal line 18 is removed. Has been. A receptacle terminal (female terminal) 21 connected to the tab terminal 8 is attached to the distal end portion of the signal line 18 from which the covering layer has been removed by crimping, welding, or the like.

  Each receptacle terminal 21 is set on a power supply side connector main body 22 constituting the main part of the power supply side connector 4. As shown in FIGS. 3 (a) and 3 (b), the power supply side connector main body 22 is made of resin, and insulates each receptacle terminal 22 and sets it at a predetermined position in a predetermined direction. The power supply side connector body 22 is formed so as to enclose the receptacle terminal 21 so as to protect the receptacle terminal 21 to be set from external force.

  The power supply side connector main body 22 is composed of a female connector, and is inserted and fitted inside the socket portion 11 b of the case side connector main body (male type connector) 11. At this time, the power supply side connector main body 22 is fitted to the case side connector main body 11 at a predetermined fitting angle so that the predetermined receptacle terminal 21 is connected to the predetermined tab terminal 8. It has become.

  That is, the case-side connector main body 11 and the power-supply side connector main body 22 are erroneously connected to uniquely determine a relative fitting angle (an angle around the axis along the fitting direction) when fitting them. A prevention structure 23 (see FIG. 1) is provided, and a predetermined receptacle terminal 21 is automatically connected to a predetermined tab terminal 8 when the connector bodies 11 and 22 are fitted together. Thereby, the incorrect connection between the receptacle terminal 21 and the tab terminal 8 can be automatically prevented.

  As shown in FIGS. 2A and 2B, the erroneous connection preventing structure 23 includes an uneven portion 23a formed on the inner peripheral surface of the socket portion 11b of the case-side connector body 11 along the fitting direction, As shown in FIGS. 3A and 3B, it is mainly composed of an uneven portion 23b formed along the fitting direction on the outer peripheral surface of the power supply side connector main body 22 as shown in FIGS. These concavo-convex parts 23a and 23b are formed so as to uniquely determine the fitting angle between the connector bodies 11 and 22, that is, the connectors 2 and 4. Further, the triangular arrangement of the tab terminals 8 arranged as shown in FIG. 2A and the triangular arrangement of the receptacle terminals 21 arranged as shown in FIG. The joint angle is uniquely determined, and constitutes a part of the erroneous connection prevention structure 23.

  The power supply side connector 4 has the power supply side metal housing | casing 13 with which the power supply side connector main body 22 was mounted | worn, as shown to Fig.3 (a). The metal housing 13 is formed of a metal cylinder formed in a substantially L shape and having a side opening 13a and a lower opening 13b. The power cable 3 is inserted into the side opening 13a, and the lower opening The power supply side connector main body 22 is attached to the portion 13b. The cable-side metal housing 13 is used to electrically shield the inside in cooperation with the case-side metal housing 12 described above.

  A retaining mechanism 24 is interposed between the power supply side metal housing 13 and the power supply side connector body 22. The retaining mechanism 24 includes a step portion 24a formed on the inner peripheral surface of the metal housing 13 and a claw portion 24b formed on the side portion of the connector main body 22, and the claw portion 24b engages with the step portion 24a. Thus, the connector main body 22 is prevented from coming out downward from the metal housing 13.

  By the way, as shown in FIG. 3A, the feeding cable 3 inserted into the side opening 13a has its outer skin 20 and shield braid 19 cut off by a predetermined length, and the shield braid 19 has outer skin 20 as shown in FIG. It is folded back in the axial direction along the outer peripheral portion. The folded shield braid 19 is fixed to the outer skin 20 via a fixed grounding mechanism 25 and is electrically connected to the metal casing 13.

  The fixed grounding mechanism 25 includes a metal sleeve 25 a attached to the inner skin 20 of the folded shield braid 19, and a cylinder formed so as to surround the outer side of the folded shield braid 19 and to contact the metal housing 13. The shield braid 19 is fixed to the outer skin 20 and electrically connected to the metal housing 13 by crimping the cylindrical bracket 25b.

  Specifically, the cylindrical metal fitting 25b is formed on the outer peripheral surface of the metal sleeve 25a via a shield braid 19 and a caulking portion 25x. A diameter-enlarging portion 25y having an outer diameter that abuts, and a flange portion 25z formed integrally with the diameter-expanding portion 25y and extending radially outwardly along the end surface of the side opening 13a of the metal housing 13. Consists of

  The caulking portion 25x fixes the shield braid 19 to the outer skin 20 by being caulked with the shield braid 19 being sandwiched between the caulking portion 25x and the metal sleeve 25a. The enlarged diameter portion 25 y supports the power feeding cable 3 so as to float inside the metal housing 13 by contacting the inner peripheral wall of the metal housing 13. The flange portion 25z is sandwiched between the end surface and the flange-like metal fitting 26 when the flange-like metal fitting 26 is fixed to the end face of the side opening 13a with bolts 27, and is electrically connected to the metal housing 13 and the flange portion 25z. Connected to.

  According to the fixed grounding mechanism 25, the folded shield braid 19 is fixed to the outer skin 20 by the caulking portion 25x and the metal sleeve 25a of the cylindrical metal fitting 25b, and the enlarged diameter portion 25y and flange of the cylindrical metal fitting 25b. The shield braid 19 is electrically connected to the metal housing 13 by the portion 25z. In this way, since the metal casing 13 and the shield braid 19 of the power cable 3 are electrically connected, these jointly shield the inside electrically.

  As shown in FIG. 3A, a wire seal 28 is provided between the enlarged diameter portion 25y of the cylindrical metal fitting 25b and the power cable 3. The wire seal 28 prevents water, oil, or dust entering from between the power cable 3 and the cylindrical fitting 25b. A housing seal 29 is provided between the enlarged diameter portion 25y of the cylindrical metal fitting 25b and the metal casing 13. The housing seal 29 exhibits a function of preventing water, oil, or dust entering from between the cylindrical metal fitting 25b and the metal housing 13.

  The operation of the present embodiment having the above configuration will be described.

  When connecting an external power supply to the motor in the case, as shown in FIG. 1, the power supply side connector 4 attached to the power supply cable 3 is fitted to the case side connector 2 attached to the upper lid 1 of the case, and the bolt Fix with 30.

  In this way, by fitting the connectors 2 and 4 together, the predetermined receptacle terminal 21 of the power supply side connector 4 is connected to the predetermined tab terminal 8 of the case side connector 2, so that the external power supply is properly connected without erroneous connection. Can be connected to. That is, since the terminals 8 and 21 for connection are set in advance at predetermined positions in both connectors 2 and 4 in a predetermined direction, it is possible to easily connect the external power supply in a short time by fitting the connectors 2 and 4 together. Can be connected appropriately, and the trouble of connecting the terminals 8 and 21 separately can be saved. In detail, since the relative fitting angle between the connectors 2 and 4 is uniquely determined by the erroneous connection prevention structure 23 between the case side connector 2 and the power source side connector 4, the erroneous connection can be completely prevented. .

  Further, when the power supply side connector 4 is fitted to the case side connector 2, the metal casings 12 and 13 of both the connectors 2 and 4 come into contact with each other, and the upper opening 12 b of the metal casing 12 and the lower portion of the metal casing 13 are contacted. The opening 13b is aligned, and the metal casings 12 and 13 cover the unshielded portions (portions where noise can be diffused) such as the terminals 8, 21 and the lead wires 9 and the signal wires 18, so that reliable. A shielding effect is obtained. That is, since the metal housings 12 and 13 having a shielding function are incorporated in the connectors 2 and 4 themselves, when the connectors 2 and 4 are fitted to each other in order to connect the terminals 8 and 21 to each other automatically, Each metal housing | casing 12 and 13 contacts and the inside is shielded. Therefore, it is not necessary to attach a shield member having a separate shielding function, and it can be used as it is, and the work can be simplified. Moreover, since it can be used as it is without attaching a shield member, the connection part can be miniaturized.

  Here, in this embodiment, as shown in FIG. 2B, the metal casing 12 is electrically connected to the metal upper lid 1 and the sealing case via the metal hermetic plate 5, and As shown in FIG. 3A, the metal casing 13 is electrically connected to the shield braid 19 of the power cable 3 via a metal fixed ground mechanism 25. Therefore, as shown in FIG. When the metal housings 12 and 13 are connected to each other by being fitted to each other, the shield including the shield braid 19 of the power cable (shield cable) 3, the metal housing 13, the metal housing 12, and the upper lid 1 is sealed. All cases are electrically connected to exert a shielding effect as a whole, and completely prevent the diffusion of noise from the inside to the outside and / or the entry of noise from the outside to the inside. Can That. The metal flange-shaped metal fitting 26 also exhibits a shielding effect.

  Further, since the connector body 11 of the case side connector 2 is formed so as to enclose each tab terminal 8 and the connector body 22 of the power source side connector 4 is formed so as to enclose each receptacle terminal 21, the hermetic compressor When assembling the device, it is possible to prevent external force from being directly applied to the terminals 8 and 21 and to prevent deformation and breakage of the terminals 8 and 21 in advance.

  Further, as shown in FIG. 2B, since the seal member 17 is provided between the connectors 2 and 4, it tries to enter the inside through between the connectors 2 and 4 from the outside. Water, oil or dust is sealed. In addition, since the seal member 16 is provided between the case-side metal housing 12 and the hermetic plate 5, water, oil, or dust to enter through the space is sealed. Further, as shown in FIG. 3 (a), a wire seal 28 and a housing seal 29 are provided between the power supply side metal housing 13 and the power supply cable 3, so let's enter through them. The water, oil or dust to be sealed is sealed. Therefore, a complete waterproof effect can be obtained.

  Another embodiment of the present invention is shown in FIGS.

  FIG. 4 shows a modified example of the case-side connector 2 and is applied when the hermetic tact 6 is attached to the hermetic plate 5 via the glass seal 7 and the attachment position can be set with high accuracy. is there. In this embodiment, the tab terminal 8 is directly attached to the hermetic tact 6 by welding or the like, and the lead wire 9 (see FIG. 2) for absorbing the displacement of the attachment position of the tact 6 between the tact 6 and the tab terminal 8. (Refer to (b)). Since other configurations are the same as those of the previous embodiment, the description thereof is omitted, but it is needless to say that the same effects as those of the previous embodiment can be obtained.

  5 is also a modification of the case-side connector 2 and is applied when the mounting position of the hermetic tact 6 can be set with high accuracy. In this embodiment, after connecting the tab terminal 8 to the hermetic tact 6 attached to the hermetic plate 5, the connector body 11 is integrally molded. Thereby, a number of parts and an assembly man-hour can be reduced. In this molding, for example, a metal casing 12 is mounted on the hermetic plate 5, a mold that supports the tab terminal 8 is mounted on the metal casing 12, and resin is placed inside the metal casing 12 inside the mold. Molded by injection or the like. Since other configurations are the same as those of the previous embodiment, the same effects as those of the previous embodiment are achieved.

  The present invention is not limited to the above embodiments. For example, the case side connector body 11 may be a female connector instead of a male connector, and the power source side connector body 22 may be a male connector instead of a female connector. Further, the terminal 8 set on the case side connector main body 11 may be a receptacle terminal (female type terminal) instead of a tab terminal (male type terminal), and the terminal 21 set on the power supply side connector main body 22 is not a receptacle terminal. It may be a tab terminal. The present invention is not limited to connecting the electric motor of the hermetic electric compressor to an external power source, but can be applied as long as the electric device in the case is connected to the external power source while being sealed. For example, the present invention can be applied to an open belt compressor.

It is a perspective view of the power supply connector for cases concerning the suitable embodiment of the present invention. It is explanatory drawing which shows the case side connector which comprises the said power supply connector, (a) is a top view, (b) is the IIb-IIb sectional view taken on the line of (a). It is explanatory drawing which shows the power supply side connector which comprises the said power supply connector, (a) is a sectional side view, (b) is a IIIb-IIIb arrow directional view of (a). It is a sectional side view of the case side connector which shows the deformation | transformation embodiment of this invention. It is a sectional side view of the case side connector which shows another deformation | transformation embodiment of this invention. It is explanatory drawing which shows a prior art example.

Explanation of symbols

1 Case top cover 2 Case side connector 3 Power cable connected to external power supply 4 Power supply side connector 6 Hermetic tact 8 Terminal (tab terminal)
12 Housing 13 Housing 17 Sealing member 21 Terminal (receptacle terminal)
23 Incorrect connection prevention mechanism

Claims (5)

  A power connector for connecting an external power source to a hermetic tact provided in the case, the connector being attached to the case and having a terminal connected to the hermetic tact, and connected to the external power source And a power supply side connector having a terminal connected to the terminal. The power supply side connector is fitted to the case side connector to connect the terminals of each connector, and the external power supply is hermetic. A power connector for a case, which is connected to a tact.   The case-side connector and the power supply-side connector each include an erroneous connection prevention structure that determines a relative fitting angle between the connectors so that predetermined terminals are connected to each other when the connectors are fitted to each other. Power connector for the case described.   The case side connector and the power source side connector each have a metal housing, and these housings are in contact with each other when the connectors are fitted to each other and electrically shield the inside. Item 3. A power connector for a case according to item 1 or 2.   The case-side connector includes a connector body that includes the terminal to protect the terminal of the connector from external force, and the power-side connector includes a connector body that includes the terminal to protect the terminal of the connector from external force. The power supply connector for cases according to claim 1, which is provided. The power connector for a case according to claim 1, wherein a seal member formed in an annular shape is provided between the case side connector and the power source side connector so as to prevent intrusion of water, oil, dust or the like.

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