JP2014173485A - Compressor driving device and compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which, when a compressor and a compressor driving device are mounted on equipment such as a refrigerator, ground connection of the compressor and the compressor driving device must be performed individually.SOLUTION: A compressor driving device 12 is mounted on a side surface of a compressor 1, a ground fitting 36 having a plurality of terminal parts is mounted on a printed circuit board 16 of the compressor driving device 12, the ground fitting 36 and a ground terminal of the compressor 1 are connected by a ground line, and the ground line is accommodated in a case of the compressor driving device. The number of ground lines connected to grounding can be reduced, and assembling of the compressor driving device 12 and the compressor 1 into equipment such as a refrigerator and the like can be performed easily. Also, by accommodating the ground line of the compressor 1 into the case of the compressor driving device 12, safety is improved, and also the compact compressor driving device 12 can be achieved.

Description

  The present invention relates to a compressor driving device attached to a refrigerator or the like and a ground connection specification of the compressor.

  Conventionally, an electric circuit such as a motor is housed in a compressor, and a ground terminal is provided on a metal shell as a countermeasure against electric shock. A safety grounding method for connecting the ground terminal to a ground is known. Has been.

  Moreover, in the drive device which drives an inverter compressor, in order to reduce inverter noise, the filter circuit was incorporated, and the method of the functional earth which connected the earth terminal of the filter circuit to earth ground has been taken ( For example, see Patent Document 1).

  Hereinafter, the ground connection specifications of the conventional compressor driving device and the compressor will be described with reference to the drawings.

  FIG. 7 is a side view showing the conventional compressor drive device described in Patent Document 1 and the ground connection specifications of the compressor.

  In FIG. 7, reference numeral 100 denotes a hermetic compressor, and a bracket 104 molded by sheet metal bending is attached to the side surface by welding.

  A ground terminal 108 is attached to the bracket 104 by welding, and is electrically connected to the compressor 100.

112 is an earth cord C, and a receptacle 112a is attached to the tip of one side, and the other side is connected to the earth ground.
By connecting the receptacle 112a to the ground terminal 108, the compressor 100 is connected to the earth ground.

  Reference numeral 116 denotes a compressor driving device having a printed circuit board 120 on which a driving circuit and a filter circuit are mounted.

  In addition to the power connector 124 mounted on the printed circuit board 120, an output connector 128 and a ground connector 132 are mounted.

  A power cord 136 is connected to the power connector 124, and a ground cord P140 is connected to the ground connector 132. The ground cord P140 is connected to a ground, so that the filter circuit of the printed circuit board 120 is grounded. It is connected to the.

  An output cord 144 is connected to the output connector 128, and a cluster block 148 is attached to the opposite side of the output cord 144, and this cluster block 148 is connected to a terminal 152 provided on the side surface of the compressor 100. It is connected.

The ground cord C112 and the output cord 144 are fixed to the bracket 104 by a cord clamp 156 and a fixing screw 160, and even if these cords are pulled, stress is not applied to the connection portion of the terminal 152 or the ground terminal 108. ing.

  Further, these connection portions are covered with a cover 148 so that the hands cannot directly touch the internal electrical connection portions.

  The operation of the compressor drive device and the ground connection specification of the compressor configured as described above will be described below.

  When the compressor driving device 116 operates, the driving power is supplied to the compressor 100 via the output cord 144 and the compressor 100 operates. The outer periphery of the compressor 100 is connected to the earth ground by the ground terminal 108 and the ground cord C112. Therefore, the compressor 100 can be operated in a state protected against electric shock due to poor insulation.

  Further, when the compressor driving device 116 is operated, switching noise is generated. The compressor driving device 116 has a built-in filter circuit, and this filter circuit is connected to the earth ground by the earth connector 132 and the earth cord P140. Therefore, the compressor 100 can be operated by reducing the switching noise and reducing the switching noise from the power cord 136 to the outside.

Japanese Patent Laid-Open No. 2002-266761

  However, in the above conventional configuration, when the compressor driving device and the compressor are attached to a device such as a refrigerator, a metal casing in which both the ground cord C112 and the ground cord P140 are connected to a ground earth such as a main body chassis of the refrigerator. There is a problem that the assembly work becomes complicated.

  The present invention solves the above-described conventional problems, and an object of the present invention is to provide a compressor driving device and a compressor that can be easily incorporated into a device such as a refrigerator.

  In order to solve the above-described conventional problems, the compressor drive device and the compressor ground connection specification of the present invention are provided with a grounding metal fitting having a plurality of terminal portions as the compressor drive device is attached to the side surface of the compressor. It is mounted on the printed circuit board of the compressor driving device, and this grounding metal and the ground terminal of the compressor are connected by a ground wire, and this ground wire is stored in the case of the compressor driving device. The number of ground wires connected to the earth ground can be reduced, and the compressor drive device and the compressor can be easily incorporated into equipment such as a refrigerator.

  In addition, since the ground wire of the compressor can be housed in the case of the compressor driving device, safety is improved and a compact compressor driving device can be realized.

  The compressor drive device and compressor refrigerator of the present invention can be easily incorporated into devices.

1 is an exploded perspective view of a compressor drive device and compressor ground connection specifications according to Embodiment 1 of the present invention. The perspective view from the compressor side of the compressor drive device in the embodiment The perspective view of the component surface side of the printed circuit board in the same embodiment The perspective view of the solder surface side of the printed circuit board in the same embodiment Perspective view of grounding metal fitting in the same embodiment Circuit block diagram of compressor drive device and compressor ground connection specifications in the embodiment Side view of conventional compressor drive and compressor ground connection specifications

  According to a first aspect of the present invention, there is provided a printed circuit board on which a drive circuit for driving a compressor and a ground connection necessary circuit are mounted, a plurality of connection terminal portions and a fixed terminal portion, and the fixed terminal portion is a ground connection required circuit of the printed circuit board. An earthing fitting to be electrically connected and an earth cord for electrically connecting the earthing fitting and the earth terminal of the compressor are provided, and the compressor is connected to the earth ground through the earthing fitting and the earth cord. Therefore, when attaching the compressor driving device and the compressor to a device such as a refrigerator, it is possible to connect both the compressor driving device and the compressor to the earth ground simply by connecting the grounding bracket to the earth ground. It is possible to reduce the number of man-hours for installing the compressor driving device and the compressor to the equipment.

  Further, since the ground wire of the compressor can be accommodated in the case of the compressor driving device, safety can be improved and a compact compressor driving device can be realized.

  According to a second aspect of the present invention, a storage case having a cord storage portion for storing the printed circuit board and storing an electrical connection cord with the compressor is mounted on the side surface of the compressor. When attached, at least one of the connection terminals of the ground metal fitting is exposed to the cord storage section, and the ground cord can be connected to the ground metal fitting from the cord storage section side, and the ground cord is stored in the cord storage section. It is something that can be done.

  As a result, the ground cord can be attached while the printed circuit board is housed in the storage case, so that the compressor drive device and the compressor can be easily assembled, and the compressor drive device can be used as a compressor. The ground cord is housed in the storage case when it is attached, and it is not touched by hand from the outside, so safety is improved and there is no need to clamp and fix the ground cord. The compressor drive device and the compressor can be easily installed.

  According to a third aspect of the present invention, the ground metal fitting has a hook portion that protrudes to the fixed terminal portion side of the printed circuit board when mounted on the printed circuit board, and the hook metal portion is twisted in the horizontal direction with the mounting surface of the printed circuit board. Since it is designed to be easily fixed to the printed circuit board, the grounding metal fitting can be securely fixed to the printed circuit board by means other than soldering, ensuring a safe ground for the compressor even when solder cracks occur. It is possible to improve the reliability against electric shock.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
1 is an exploded perspective view of a compressor drive device and a ground connection specification of the compressor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view from the compressor side of the compressor drive device according to the same embodiment, FIG. Is a perspective view of the component surface side of the printed circuit board in the same embodiment, FIG. 4 is a perspective view of the solder surface side of the printed circuit board in the same embodiment, FIG. 5 is a perspective view of the grounding metal fitting in the same embodiment,
FIG. 6 is a circuit block diagram of the compressor drive device and compressor ground connection specification in the same embodiment.

  1 to 6, reference numeral 1 denotes a compressor having a hermetically sealed metal outer shell, and a bracket 4 molded by sheet metal bending is attached to a side surface by welding.

  A ground terminal 8 is attached to the bracket 4 by welding, and is electrically connected to the compressor 1.

  The compressor driving device 12 includes a printed circuit board 16, a storage case 20, an aluminum plate 24, and the like.

  In the storage case 20, the printed circuit board 16 is stored inside, and the opening is closed with an aluminum plate 24 and fixed by a fixing screw 28.

  On the printed circuit board 16, the semiconductor element 32, which is a component of the drive circuit 16 b that performs switching driving of the compressor 1, is on the solder surface side 16 b that is the fixed terminal portion side, and the ground metal fitting 36 that is connected to the ground is on the component surface side. In addition to being mounted on the filter circuit 16a by soldering, an output connector 17 and a power input connector 18 are also mounted, and a filter circuit 16a and a drive circuit 16b, which are ground connection necessary circuits, are also mounted.

  Similarly to the compressor side terminal 36a which is a connection terminal portion, the ground metal fitting 36 has a ground ground side terminal 36b which is a connection terminal portion, a solder terminal 36c and a hook portion 36d which are fixed terminal portions. After being inserted into the insertion hole, the hook part 36d is fixed to the printed circuit board 16 by being deformed by twisting and clinching the solder surface 16b of the printed circuit board 16 in the horizontal direction.

  The soldering terminal 36c of the ground metal 36 is soldered to the printed circuit board 16 to form a fixed terminal portion, and is electrically connected to the filter circuit 16a of the printed circuit board 16. Of course, the hook portion 36d is also connected to the printed circuit board 16. The filter circuit 16a may be electrically connected to the filter circuit 16a.

  The earth ground side terminal 36b of the ground metal fitting 36 is connected to the earth ground.

  The semiconductor element 32 is also soldered and mounted on the printed circuit board 16 as a fixing means, and the heat radiating plate 40 is attached to the semiconductor element 32 by a semiconductor fixing screw 44 in close contact.

  The heat radiating plate 40 stores the printed circuit board 16 in the storage case 20 and comes into surface contact with the aluminum plate 24 when the printed circuit board 16 is closed with the aluminum plate 24.

  There is a cord storage portion 20a on the compressor side of the storage case 20, and there is a through hole 20b in the inner surface of the cord storage portion 20a. The compressor side terminal 36a protrudes from the through-hole 20b to the compressor 1 side.

  The ground cord 48 is provided with receptacle terminals 48 a for connection at both ends, and electrically connects the compressor-side terminal 36 a of the ground metal fitting 36 and the ground terminal 8 attached to the compressor 1.

  The compressor drive device 12 is attached to the compressor 1 in a state where the ground metal fitting 36 and the ground terminal 8 are connected by the ground cord 48. At this time, the ground cord 48 and the output connector 17 are electrically connected to the terminal 1a of the compressor 1. The output cord 49 is accommodated inside the cord accommodating portion 20a, and the bent portion 4a of the bracket 4 is attached so as to be engaged with the hanging portion 20c of the accommodating case 20, and the case fixing hole 20d of the accommodating case 20 and the bracket are attached. 4 fixing screw holes 4 b are fixed by case fixing screws 52.

  The operation and action of the compressor drive device configured as described above and the ground connection specification of the compressor will be described below.

  First, the power supplied from the power input connector 18 is supplied to the drive circuit 16b via the filter circuit 16a.

  The drive circuit 16b drives the compressor 1 via the output cord 49. At this time, the semiconductor element 32 generates heat.

  Since this heat is conducted to the aluminum plate 24 through the heat radiating plate 40 and is radiated to the outside of the storage case 20, the semiconductor element 32 is not thermally destroyed.

  Further, when the compressor 1 is driven, the circuit inside the compressor 1 is energized, and the metal shell of the compressor 1 is connected to the earth ground through the ground terminal 8, the ground cord 48 and the ground metal fitting 36. Therefore, the safety earth which secures the safety against electric shock is made, and it can drive safely.

  Further, when the semiconductor element 32 operates, switching noise is generated, but compression is performed while preventing the switching noise from being discharged from the power input connector 18 to the outside by the filter circuit 16a connected to the earth ground via the grounding metal 36. The machine 1 is driven.

  As described above, in the present embodiment, the ground metal fitting 36 having a plurality of connection terminal portions and soldering terminal portions is soldered and mounted on the printed circuit board 16, and the filter circuit 16a and the compressor 1 are connected via the ground metal fitting 36. Can be connected to the earth ground, and the compressor drive device and the compressor can be easily attached to a device such as a refrigerator.

  There is a plan to attach the grounding metal 36 to the storage case 20. In this case, however, a connection cord for connecting the grounding metal 36 and the filter circuit 16 a of the printed circuit board 16 is required. The ground connection specification is better.

  In addition, at least one of the connection terminals of the ground metal fitting 36 is exposed to the cord storage portion side, and the ground cord 48 can be connected to the ground metal fitting 36 from the cord storage portion 20a side, so the printed circuit board 16 is attached to the storage case 20. It is not necessary to attach the ground cord 48 to the ground metal 36 in advance, the assembly of the compressor driving device 12 can be simplified, and the ground cord 48 is attached to the side surface of the compressor 1 with the storage case 20 attached. Is stored in the cord storage portion 20a and is not touched by hand from the outside of the storage case 20, so that safety is secured and there is no need to clamp and fix the ground cord. The number of installation steps of the drive device and the compressor can be reduced.

  Further, since the ground wire of the compressor 1 can be stored in the storage case 20 of the compressor driving device 12, safety can be improved and a compact compressor driving device 12 can be realized.

Further, since the grounding metal 36 can be easily fixed to the printed circuit board 16 by twisting the hook portion 36d in the horizontal direction with the mounting surface of the printed circuit board 16, the grounding metal can be securely attached to the 36 printed circuit board 16 by means other than soldering. Since it can fix, even if a solder crack etc. occur, the safety ground of the compressor 1 can be ensured and the reliability with respect to an electric shock can be improved.

  As described above, the compressor drive device and the ground connection of the compressor according to the present invention simplify the assembly of the compressor drive device and attach the compressor drive device and the compressor to equipment such as a refrigerator. Since the reliability for safety can be improved, it can be applied to other devices having a ground connection.

DESCRIPTION OF SYMBOLS 1 Compressor 8 Ground terminal 12 Compressor drive device 16 Printed circuit board 16a Filter circuit 20 Storage case 20a Cord storage part 36 Ground metal fitting 36a Compressor side terminal 36b Earth ground side terminal 36c Soldering terminal part (fixed terminal part)
36d Hook part 48 Ground cord

Claims (4)

A printed circuit board on which a drive circuit for driving the compressor and a circuit necessary for ground connection are mounted;
A grounding metal fitting having a connection terminal part and a fixed terminal part and the fixed terminal part being electrically connected to a ground connection required circuit of the printed circuit board,
An earth cord for electrically connecting the earth metal fitting and the earth terminal of the compressor;
A compressor driving device in which a compressor is connected to a ground earth via the ground metal fitting and the ground cord. A storage case that is attached to a side surface of the compressor and that stores the printed circuit board and has a cord storage portion that stores an electrical connection cord with the compressor;
With the printed circuit board attached to the storage case, at least one of the connection terminal portions of the ground metal fitting is exposed to the cord storage portion side,
The compressor driving device according to claim 1, wherein the ground cord can be connected to the ground metal fitting from the cord storage portion side. The ground metal fitting, when mounted on the printed circuit board, has a hook portion that protrudes to the fixed terminal portion side of the printed circuit board,
The compressor driving device according to claim 1, wherein the compressor driving device is fixed to the printed circuit board by deforming the hook portion. The compressor provided with the compressor drive device as described in any one of Claim 1 to 3.