JP5879481B2 - Inverter unit integrated electric compressor - Google Patents

Description

  The present invention relates to an inverter unit integrated electric compressor in which an electric compressor unit that sucks, compresses and discharges refrigerant and an inverter unit that drives the motor are integrated.

  As an inverter device integrated electric compressor, there is one in which an inverter device is mounted in the central axis direction of the electric compressor (see, for example, Patent Document 1). In such an inverter-integrated electric compressor, an electric motor and an inverter device for driving the electric motor are electrically connected in a main body casing.

JP 2010-101307 A

  However, the inverter device-integrated electric compressor having the above-described configuration has a problem in that the electrical connection between the motor and the inverter device is very troublesome and the productivity is poor. That is, the main body casing and the inverter device in which the electric motor and the rear part of the compressor are accommodated are configured separately, and the harness connector from the electric motor on the main body casing side is connected to the compressor terminal on the inverter device side when combining them. At that time, the inverter device is turned over so that it is fitted to the main body casing, so that the position of the compressor terminal terminal on the inverter device side and the terminal hole of the harness connector is difficult to align and takes time. It was. To solve this problem, set the harness connector lead wires long and connect the harness connector to the compressor terminal without turning the inverter device upside down, and then turn the inverter device upside down. Although measures have been taken to fit the main body casing, the longer the lead wire, the higher the cost, and when the inverter device and the main body casing are assembled, the lead wire becomes loose and wasted. There was a problem.

  An object of the present invention is to solve such a problem, and an object of the present invention is to provide an inverter-integrated electric compressor with high productivity by improving work efficiency without lengthening a lead wire.

In order to solve the above-described conventional problems, an inverter-integrated electric compressor of the present invention includes an electric compressor including a compression mechanism section and an electric motor that drives the compression mechanism section, and a central axis of the electric compressor. An inverter device-integrated electric compressor composed of an inverter device mounted in a direction and operating the electric motor, wherein the inverter device is provided with a compressor terminal for electrical connection with the electric motor. The compressor terminal is provided so as to face the electric compressor side, and the concave fixing portion continuous from the compressor terminal is substantially the same shape as the harness connector at the portion where the harness connector from the electric motor is connected. It is formed in a shape that case, the harness connector and pressure by fitting the harness connector to the fixed part And machine terminal is a configuration in which both are aligned is detachably connected.

As a result, if you bring the harness connector on the motor side and bring this harness connector upside down and bring it into the compressor terminal part of the inverter device and fit it into the fixed part, the position of the terminal of the compressor terminal and the terminal hole of the harness connector will be If the inverter device is pressed against the main body casing as it is, the compressor terminal and the harness connector can be connected, eliminating the trouble.

  The inverter-integrated electric compressor according to the present invention improves the working efficiency during assembly, improves productivity, and optimizes (shortens) the lead wire length of the harness connector, thereby suppressing an increase in cost. be able to.

The front view and side view of the inverter apparatus integrated electric compressor in Embodiment 1 of this invention The perspective view which decomposed | disassembled and showed the fitting part of the inverter case and main body casing of the inverter apparatus The exploded perspective view which shows the circuit board side of the inverter case of the inverter device The perspective view which decomposed | disassembled and showed the fitting part of the inverter case and main body casing of the inverter apparatus in Embodiment 2 of this invention. Sectional drawing of the harness connector connection part in Embodiment 3 of this invention

1st invention is comprised from an electric compressor provided with the compression mechanism part, the electric motor which drives the said compression mechanism part, and the inverter apparatus mounted in the center axis direction of the said electric compressor, and operating the said electric motor. An inverter device-integrated electric compressor, wherein the inverter device is provided with a compressor terminal for electrical connection with the motor, and the compressor terminal is provided so as to face the electric compressor side. A concave fixing portion continuous from the compressor terminal is formed in a shape in which the harness connector is fitted to the portion connecting the harness connector from the electric motor , and the harness connector is fitted to the fixing portion. Are fitted together so that the harness connector and the compressor terminal are aligned and detachably connected. If you have a harness connector on the motor side and bring this harness connector upside down and bring it into the compressor terminal part of the inverter device and insert it into the fixed part, the position of the terminal of the compressor terminal and the terminal hole of the harness connector If the inverter device is pressed against the main body casing as it is, the compressor terminal and the harness connector can be connected, eliminating the trouble.

  Further, the second invention is the first invention, wherein the terminal of the compressor terminal is configured such that the direction of the terminal is regulated by a positioning hole provided in the circuit board of the inverter device. Even if the external appearance of the machine terminal is circular and the terminal position is slightly shifted in the circumferential direction, the terminal position can be accurately regulated, and the connection between the compressor terminal and the harness can be established. It can be performed more accurately and in a short time.

  In addition, according to a third invention, in any one of the first and second inventions, a portion of the motor to which the harness connector on the inverter device side is connected is provided with a fixing portion having the same shape as the harness connector. If the harness connector is fitted into the fixing part on the motor side, when the inverter device is attached to the main body casing, the terminal of the compressor terminal and the terminal hole of the harness connector are aligned at the fixing part on the inverter device side, Since it can be connected simultaneously with the inverter device, the number of assembly steps can be reduced. Further, since the work of fitting the harness connector into the inverter device is eliminated, the lead wire length of the harness connector can be optimized (shortened).

In addition, a fourth aspect of the present invention is the structure according to any one of the first to third aspects, wherein the harness device is pressed by the casing of the electric motor after connecting the inverter device and the electric motor. The compressor terminal can be prevented from coming off from the harness connector, and the reliability of the electrical connection portion can be improved.

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

(Embodiment 1)
FIG. 1 shows an inverter apparatus-integrated electric compressor according to Embodiment 1 of the present invention. FIG. 1 shows an example of a horizontal inverter device-integrated electric compressor that is mounted sideways by mounting legs (not shown) around the body of the electric compressor 1.

  The electric compressor 1 incorporates an electric motor 5 and a compression mechanism section 4 in its main body casing 3. The electric motor 5 is driven by the inverter device 101, and the compression mechanism unit 4 driven by the electric motor 5 sucks, compresses and discharges the low-pressure refrigerant from the refrigeration cycle through the suction port 8 provided in the inverter case 102. The discharged refrigerant enters the electric motor 5 side and is discharged from the discharge port 9 of the main casing 3 to the refrigeration cycle while the electric motor 5 is cooled. That is, the electric compressor 1 is a high-pressure compressor.

  The inverter case 102 is fastened to the main body casing 3 by bolts 56. An inverter cover 113 is fixed to the inverter case 102 with screws 55. The inverter device 101 is provided with a direct connector 117 for the inverter device 101 to be electrically connected to the outside.

  FIG. 2 is a perspective view when the inverter case 102 and the main body casing 3 are disassembled. The inverter case 102 and the compression mechanism portion 4 exposed at the end of the main body casing 3 are hermetically fitted through O-rings 91 and 92, thereby forming a refrigerant passage space 70 that leads from the suction port 8. The The refrigerant sucked from the suction port 8 provided in the inverter case 102 is diffused into the cooling passage space 70 and cools the inverter case end wall 102a, thereby generating heat from the switching element module 105 and the like mounted on the back surface thereof. After cooling the body, it flows into the passage hole 71 compression space of the compression mechanism section 4.

  A circular outer compressor terminal 106 is fixed to the inverter case 102 by a tomewa 80 or the like. A portion where the compressor terminal 106 is fixed is formed with a concave fixing portion 102b which is continuous downward and rightward in FIG. 2 from the circular shape of the compressor terminal. The shape of the fixed portion 102b is formed such that a harness connector from an electric motor, which will be described later, is just fitted. The inverter case 102 is directly installed with a direct connector 117 for connecting to an external power source.

  A lead wire 81 from the electric motor 5 is connected to the harness connector 121 through a communication passage 82 provided in the vicinity of the outer periphery of the compression mechanism unit 4 and is electrically connected to the compressor terminal 106. The inverter case 102 is mechanically connected to the main casing 3 with the O-rings 91 and 92 sandwiched by bolts 56 passing through the bolt through holes 116. The O-ring 92 has a low pressure, and the O-ring 91 to the O-ring 92 has a high pressure. Since the harness connector 121 is used for the electrical connection and the bolt 56 is used for the mechanical connection, the electrical connection can be made detachable. Thereby, the inverter apparatus 101 and the electric compressor 1 can be separated. For this reason, the degree of freedom and work efficiency of the work place for assembly and inspection can be improved.

Here, the harness connector 121 from the electric motor 5 is brought to the compressor terminal portion of the inverter case 102 that is turned over when viewed from the operator side when the harness connector 121 is fitted to the main body casing 3. If it fits in the fixing | fixed part 102b, the position of the terminal hole of the compressor terminal 106 and the harness connector 121 will match, and if the inverter case 102 is pressed into the main body casing 3 as it is, the connection of the compressor terminal 106 and the harness connector 121 will be made. It is possible to make electrical connection between the two without any trouble.

  Further, in this electric compressor, since the inverter case 102 and the main body casing 3 are detachably integrated electrically and mechanically, the inverter device 101 which is an electronic device is an electric device which is a mechanical instrument in an electronic device factory. The compressor 1 can be produced by appropriately sharing a machine tool factory. That is, after the inverter device 101 is completed (assembled / inspected) at the electronic equipment factory, it is carried into the machine tool factory, and is electrically connected by the harness connector 121 and mechanically (structured) by the bolt 56. Good. Accordingly, the assembly / inspection process of the electric compressor 1 does not require a clean room equivalent to the electronic component assembly / inspection process. In addition, the inspection can be performed separately if mechanically separated by the bolt 56 and electrically separated by the harness connector 121. In energization when the inverter device 101 is inspected, the inverter case 102 is a thick metal housing connected to the main casing 3, and therefore can function as a heat sink that operates for a short time. Then, if necessary, the other party's dummy may be attached and detached for assembly / inspection, inspection / repair, and the like.

  FIG. 3 is an exploded perspective view of the inverter device 101 on the switching element module 105 side. A switching element module 105 and a current smoothing capacitor 108 are arranged on the inverter case end wall 102c of the inverter case 102, and the inverter device 101 is configured such that the circuit board 103 covers these components including the compressor terminal 106. Yes.

  Here, the terminal 109 of the compressor terminal 106 is formed, and the circuit board 103 of the inverter case 102 is formed with a positioning hole 104 into which the terminal 109 of the compressor terminal 106 is fitted. The direction of the terminal terminal 109 is regulated. Therefore, even when the external shape of the compressor terminal 106 is circular and the position of the terminal 109 is slightly shifted in the circumferential direction, the terminal position can be accurately regulated. And the harness connector 121 can be more accurately and quickly connected.

  An inverter cover 113 is fixed to the inverter case 102 with screws 55. The screw 55 passes through the screw through hole 114 of the inverter cover 113 and is fastened to the screw hole 115 of the inverter case 102. Further, a sheet material 120 having a sound insulation and vibration control effect is attached to the inverter cover 113 to prevent noise generated from the electric motor 5 or the compression mechanism unit 4 from being transmitted through the inverter cover 113 and radiated to the outside. be able to. A resin may be applied instead of the sheet material 120. Further, by using a material having an electrical insulation effect, electrical insulation can be ensured, which is more effective.

  Furthermore, by sandwiching a heat insulating material such as a stainless steel plate in accordance with the shape of the fitting portion between the inverter case 102 and the main body casing 3 at a place where the inverter case 102 and the main body casing 3 are fitted, Heat transfer from the casing 3 to the inverter case 102 can be suppressed, and the cooling effect of the inverter by the suction refrigerant can be enhanced. In the above-described embodiment, the refrigerant passage space is formed by assembling the inverter device 101 side and the electric compressor 1 instead of being completely separated, and the cooling function of the inverter device 101 is realized. Therefore, the size and weight can be reduced as compared with the case where a separate intake refrigerant passage is configured.

In comparison between FIG. 1 and FIGS. 2 and 3, the relative positional relationship between the suction port 8 and the compressor terminal 106 is different for convenience of explanation, but is not related to the operational effect. In addition, the cooling method of the inverter device 101 is not limited to the method of forming the refrigerant passage space between the inverter case 102 and the compression mechanism unit 4 described above, and the arrangement of the compression mechanism unit 4 and the electric motor 5 in the main body casing 3. Any method may be used, such as replacing a low pressure compressor. Moreover, as the compression mechanism part 4, any of a scroll system, a rotary system, etc. may be sufficient. The method of detachably fixing the inverter case 102 to the main body casing 3 is not limited to the above-described method using bolts, and various methods such as fixing the inverter case 102 as male screws and the main body casing 3 as female screws are conceivable. It is done. The direction of the central axis of the electric compressor 1 is a rotation axis direction in the case of a rotary type, and a reciprocating direction in the case of a linear type.

(Embodiment 2)
In the present embodiment, in particular, in Embodiment 1, a fixing portion 4a having substantially the same shape as the harness connector is configured at a position facing the fixing portion 102b provided in the inverter device 102 of the electric motor 5. Parts similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 4 shows a perspective view of the inverter case 102 and the main body casing 3 of the inverter apparatus-integrated electric compressor according to the second embodiment of the present invention. As shown in FIG. 4, the inverter terminal 102 and the main casing 3 are connected after the compressor terminal 106 and the harness connector 121 are connected by configuring the fixing portion 4 a of the harness connector 121 to the main casing 3 on the electric motor 5 side. When the inverter device 102 is connected to the main body casing 3 by setting the harness connector 121 to the fixing portion 4a, the configuration that can only be assembled in the order is aligned with the fixing portion 102b and the harness connector 121. As a result, the inverter device 102 and the electric motor 5 can be assembled at the same time as the compressor terminal 106 and the harness connector 121 while being aligned. Moreover, since it is not necessary to pull out the lead wire 81 and connect it to the compressor terminal 106 when the harness connector 121 is connected, the length of the lead wire 81 can be suppressed to the minimum necessary length.

  Moreover, in this Embodiment, the shape of the fixing | fixed part 4a is set as the structure which hold | maintains the harness connector 121, It will suppress the rattle of the harness connector 121, and will improve the working efficiency at the time of connecting simultaneously with the inverter apparatus 102. can do.

(Embodiment 3)
In this embodiment, in particular, in Embodiment 1 or 2, after connecting the inverter device 102 and the electric motor 5, the harness connector 121 is held by the electric motor 5 to the compressor terminal 106 side. Parts similar to those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 5 shows a cross-sectional view of the harness connector mounting portion of the inverter-integrated electric compressor according to Embodiment 3 of the present invention.

  As shown in FIG. 5, by connecting the inverter device 102 and the electric motor 5, the electric compression is achieved by configuring the fixing portions 102 b and 4 a so that the harness connector 121 is pressed against the compressor terminal 106 by the electric motor 5. The harness connector 121 cannot be disconnected from the compressor terminal 106 after the machine is completed, and the reliability of the electrical connection portion can be improved.

The electric compressor integrated with an inverter device according to the present invention improves the work efficiency during assembly, improves productivity, and optimizes (shortens) the length of the lead wire of the harness connector, thereby suppressing an increase in cost. can do. Therefore, it can be widely applied for consumer use and industrial use.

DESCRIPTION OF SYMBOLS 1 Electric compressor 3 Main body casing 4 Compression mechanism part 4a Fixed part (motor side)
5 Electric motor 8 Suction port 9 Discharge port 55 Screw 56 Bolt 70 Refrigerant passage space 71 Passage hole 80 Tomewa 81 Lead wire 82 Connecting passage 91 O-ring (for main body casing and inverter case)
92 O-ring (for compression mechanism and inverter case)
101 Inverter device 102 Inverter case 102a Inverter case end wall 102b Fixed part (inverter device side)
102c Inverter case end wall 103 Circuit board 104 Positioning hole 105 Switching element module 106 Compressor terminal 108 Current smoothing capacitor 109 Terminal (compressor terminal)
113 Inverter cover 114 Screw through hole 115 Screw hole 116 Bolt through hole 120 Sheet material 121 Harness connector (for compressor terminal connection)

Claims (4)

Inverter unit-integrated electric compression comprising an electric compressor including a compression mechanism unit, an electric motor that drives the compression mechanism unit, and an inverter device that is mounted in the central axis direction of the electric compressor and operates the electric motor A compressor terminal for making electrical connection with the electric motor in the inverter device, the compressor terminal being provided to face the electric compressor side and a harness connector from the electric motor A concave fixing portion that is continuous from the compressor terminal is formed in a shape that is substantially the same shape as the harness connector and fits to the harness connector, and by fitting the harness connector to the fixing portion, Inverter device in which the harness connector and the compressor terminal are aligned and detachably connected to each other Integrated electric compressor. The terminal of the compressor terminals, the positioning holes provided on the circuit board of the inverter device, the inverter-integrated electric compressor according to claim 1, characterized in that it is restricted to the direction of the terminal. The inverter according to claim 1 or 2, characterized in that the harness connector to the inverter device side of the electric motor comprises a fixed portion configured to fit and to have a mechanism for holding the harness connector to the fixed part Device-integrated electric compressor. The said harness connector is attached to the said compressor terminal, Furthermore, it has the structure which presses the said harness connector to the said compressor terminal side with the housing | casing of the said electric motor, The structure of any one of Claims 1-3 characterized by the above-mentioned. Inverter unit integrated electric compressor.