JP4529648B2 - Hermetic electric compressor - Google Patents

Description

  The present invention relates to a hermetic electric compressor mounted in a refrigeration apparatus or an air conditioner, and more particularly, a hermetic electric compression in which a control unit that controls a drive unit by inverter control using an AC power source is integrally mounted on the compressor. Related to the machine.

  Miniaturization and energy saving are required for home air conditioners and the like. From such a viewpoint, the indoor unit is required to increase the heat transfer area of the heat exchanger, and the outdoor unit is required to reduce the size of the outdoor unit while increasing the heat transfer area of the heat exchanger. On the other hand, the compressor mounted in the outdoor unit is also required to have a small size and high performance. For the compressor, it is also required to integrate the compressor body and the control unit so that the compressor components can be miniaturized and easily assembled.

  Furthermore, compressors with inverter control are the mainstream as compressors for home air conditioners, and the compressor and the control unit that controls the compressor are installed in the outdoor unit that constitutes the air conditioner to operate the refrigeration cycle is doing.

FIG. 5 is a perspective view showing a schematic configuration of an outdoor unit in a conventional separation-type air conditioner. As shown in FIG. 5 , the outdoor unit main body 100 includes a compressor 110 in which a compression mechanism unit (not shown) and a motor unit (not shown) for driving the compression mechanism unit are housed in an airtight container, outside air, The outdoor heat exchanger 120 for performing the heat exchange and the blower 130 for blowing the outside air for the heat exchange. These components are housed in an outer frame (not shown). In addition, a drive circuit unit 140 for driving the component parts of the outdoor unit 100 is disposed in the upper space of the outdoor unit 100 so as to be separated from the compressor 110.

  The drive circuit unit 140 includes a compressor control unit for driving and controlling the compressor 110, a fan control unit for driving and controlling the fan 130, a refrigeration cycle control unit for driving and controlling the refrigeration cycle, and Although it is configured by a wiring section to the indoor unit, most of the components are a compressor control unit.

On the other hand, FIG. 6 shows a drive circuit diagram for driving a compressor by inverter control as a compressor of an air conditioner. As shown in FIG. 6 , the drive circuit includes a rectifier circuit unit 210 serving as a converter circuit unit that converts the AC commercial power supply 200 into DC, and an inverter circuit that converts the DC into three-phase AC and drives the motor 220 of the compressor 110. A switching circuit unit 230 that is a part, a gate drive circuit unit 240 that drives the switching circuit unit 230, and an arithmetic unit 250 that generates an energization signal. Here, the rectifier circuit unit 210 is formed by a combination of a reactance 260, a capacitor 270, a diode 280, and the like. The switching circuit unit 230 includes a switching element 290 made of an insulated gate bipolar transistor (IGBT) or a power transistor capable of high-speed switching.

As shown in FIG. 5 , the drive circuit unit 140 is provided separately from the respective drive elements, and is configured to be connected to the drive elements by wiring at the time of assembly.

On the other hand, an inverter-controlled compressor is also mounted on an in-vehicle air conditioner in recent years, and an example in which the compressor and the compressor control circuit unit are integrated for the purpose of reducing the size and weight of the air conditioner has been disclosed ( For example, Patent Document 1 and Patent Document 2).
JP 2002-174178 A JP 2003-13859 A

  In an air conditioner using an inverter-driven compressor using an AC commercial power supply, the compressor body and the control unit are provided separately, and the volume of the control unit occupying the outdoor unit increases. The effective heat transfer area of the vessel is reduced to impair performance.

  On the other hand, when the control unit is downsized and mounted on the upper part of the compressor and the control unit and the compressor are integrated to reduce the volume occupied in the outdoor unit, the following problems occur. That is, when an electrical connection or a signal connection is made between the control unit and the motor unit of the compressor, an extra space is generated by routing the wiring from each. Furthermore, there are problems such as wiring mistakes and wiring assembly time. Furthermore, when the length of the wiring is longer than a predetermined amount, there is a problem that noise is easily generated.

  The present invention has been made to solve the above-mentioned problems, and a control unit is integrally mounted on the compressor housing to reduce the volume occupied by the entire compressor including the drive control circuit, and It is an object of the present invention to provide a hermetic electric compressor that improves the workability of electrical connection and signal connection between a control unit and a compressor and improves the quality of connection.

In order to solve these problems, a hermetic electric compressor according to the present invention includes a control unit in which a drive circuit unit is built in a casing, a compression mechanism unit, and a motor unit that is driven and controlled by the control unit. And a second connection provided by coupling and supporting the control unit with the compressor housing, and mounting the control unit on the compressor housing. The signal is connected by electrically non-contact type signal connection means by engaging the part.

By adopting such a configuration, the control unit is integrally mounted on the upper part of the compressor housing to realize the miniaturization of the hermetic electric compressor, and the signal connection between the control unit and the compressor can be achieved in a small space. Realize a hermetic compressor that is not affected by the electrical insulation, vibration, temperature environment, and dust and other installation environments , and that prevents noise generation. be able to.

Furthermore, by making the electrically non-contact signal connecting means a signal connecting means based on an optical signal transmission method, a highly reliable signal connection is realized without being affected by an environment such as electrical noise, vibration or temperature. be able to.

In addition, it is desirable that at least one of the first connection unit coupled and supported by the casing of the control unit and the second connection unit coupled and supported by the compressor casing is coupled and supported by the elastic body. The elastic member prevents the first connection portion and the second connection portion from being broken or disengaged due to the vibrations, and the electrical connection can be reliably performed.

In addition, it is desirable to arrange a heat insulating material between the compressor housing and the housing of the control unit, and the reliability of the control unit can be improved without giving the control unit the influence of the compressor that becomes hot. The heat insulating material can suppress the propagation of the compressor vibration to the control unit.

According to the hermetic electric compressor of the present invention, when the control unit is integrally mounted on the upper part of the compressor housing to achieve downsizing of the hermetic electric compressor , the signal connection between the control unit and the compressor is achieved. Workability and quality can be improved.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
Figure 1 is a diagram showing an outdoor unit of an air conditioner equipped with a hermetic electric compressor definitive to the embodiment of the present invention. Fig.1 (a) is a top view of an outdoor unit, FIG.1 (b) is the front view. The outdoor unit body 10 includes an exterior part 11, an outdoor heat exchanger 12, a blower fan 13, a blower motor 14, a bell mouth 15 serving as a blower guide, and a compressor 16. The compressor 16 includes a compressor main body 17 and a control unit 18 that is mounted on and integrated with the compressor main body 17.

  The difference between the outdoor unit 10 in the present embodiment and the conventional outdoor unit shown in FIG. 8 is the overall configuration of the compressor and the configuration of the drive circuit unit. That is, the compressor control unit 18 occupying most of the drive circuit unit is made compact and compact and is integrally mounted on the upper portion of the compressor body 17. Therefore, the non-effective heat transfer area 19 in the outdoor heat exchanger 12 that has conventionally been a wasteful area by the drive circuit unit can be made an effective heat transfer area, and the air conditioning capacity can be increased. .

Further, as in the embodiment of the present invention , since the compressor body 17 and the control unit 18 are integrated in the compressor 16, not only the assemblability is improved when the outdoor unit 10 is assembled, but also in maintenance. In addition, the compressor 16 and the control unit 18 can be handled as one unit, so that maintainability is improved.

FIG. 2 is a front view schematically showing the compressor 16 in the embodiment of the present invention . As shown in FIG. 2, a compressor mechanism 22 that compresses refrigerant sucked from a refrigerant suction pipe 21 and a motor that drives the compression mechanism section 22 are provided inside a compressor main body 17 formed of a hermetically sealed compressor housing. The part 23 is stored and arranged. The rotational force generated by the motor unit 23 is transmitted to the compression mechanism unit 22 through a rotation shaft (not shown), and a compression component (not shown) of the compression mechanism unit 22 is rotated or reciprocated. The refrigerant is compressed, and the compressed refrigerant is supplied into the refrigeration cycle from the refrigerant discharge pipe 24 provided at the upper part. The compressor body 17 is disposed and fixed to the outdoor unit 10 by a base 25.

FIG. 3 is a plan view showing an example of the internal configuration of the control unit of the hermetic electric compressor according to the embodiment of the present invention , and FIG. Details of the control unit 18 will be described with reference to FIGS. 3 and 4. In the control unit 18, the side plate portion 32, the bottom plate portion 33, and the top plate portion 34 form a cylindrical sealed casing structure 35, and the motor section 23 and the compression mechanism section 22 of the compressor body 17 are formed inside the casing 35. A drive circuit component for controlling the drive is housed. Drive circuit components, as shown enclosed by a two-dot chain line in FIG. 3, the AC rectification circuit section 36 is a converter unit for converting a commercial power into direct current, the switching circuit 37 is an inverter unit for converting direct current into alternating current, The control circuit unit 38 is divided into the respective blocks and stored. A discharge pipe penetrating portion 39 through which the refrigerant discharge pipe 24 from the compressor body 17 passes is provided in the central portion of the control unit 18. In the rectifier circuit 36, a diode 40, a capacitor 41, a reactance 42, and the like are arranged. The switching circuit unit 37 is provided with an IGBT element 43 that performs high-speed switching, a drive circuit 44 for driving the element, and the like. Further, control circuit parts such as a control signal generator 45 and a microcomputer 46 are arranged in the control circuit unit 38.

FIG. 4 is a cross-sectional view showing configurations of a control unit side connector portion and a compressor main body side connector portion of the hermetic electric compressor according to the embodiment of the present invention .

FIG. 4 shows the control unit side connector 71 and the compressor body side connector 72 provided on the compressor body 17, respectively, rotating the control unit 18 in the embodiment of the present invention. The engaged state is shown by moving. The configuration of the terminal portion for supplying power from the control unit 18 to the compressor main body 17 is a male terminal portion.
4 and the female terminal portion are connected to each other and connected in parallel with the configuration shown in FIG. 4, but will not be described in the description of the present embodiment. Therefore, FIG. 4 shows the details of the configuration of the connector part related to transmission / reception of control signals between the control unit 18 and the compressor body 17.

In the case of the embodiment of the present invention, the signal transmission / reception method of the connector unit is an optical signal method. As shown in FIG. 4 , the compressor main body side connector portion 72 is fitted to the control unit side connector portion 71. The control unit side connector portion 71 includes a connector body 73 and a control unit side transceiver 76 including a converter 74 and a transmission / reception end 75, and a wiring 84 from the control unit 18 is connected to the converter 74. Yes. Further, the compressor main body side connector portion 72 includes a connector main body 77 and a compressor unit side transmitter / receiver 80 including a converter 78 and a transmission / reception end 79, and the converter 78 has wiring from the compressor main body 17. 81 is connected.

  The connector main body 73 of the control unit side connector 71 is coupled and supported to the bottom plate 33 of the control unit 18 via an elastic body 82, and the connector main body 77 of the compressor main body side connector 72 is connected via an elastic body 83. The compressor body 17 is coupled and supported.

  The transmission / reception end 75 on the control unit 18 side and the transmission / reception end 79 on the compressor body 17 side are adjusted in optical axis, and the distance between them is further adjusted. These transmission / reception terminals 75 and 79 are couplers for inputting and outputting optical signals, and are configured to exchange optical signals between them. An electrical signal such as a compressor operation stop signal, frequency indication, and temperature (thermistor) information, which is an input signal from the control unit 18, is converted into an optical signal by the converter 74, transmitted from the transmission / reception end 75 as an optical signal, and compressed The signal is received by the transmission / reception terminal 79 on the machine body 17 side and converted into an electric signal by the converter 78 to control the operation of the compressor 16. On the other hand, information such as the internal temperature and operating current of the compression mechanism 22 in the compressor 16 and the motor 23 that drives the compression mechanism 22 is converted from an electrical signal to an optical signal by the converter 78 and transmitted from the transceiver 79. And transmitted to the control unit 18 side.

As described above, in the embodiment of the present invention , control signals are exchanged between the control unit 18 and the compressor body 17 by electrically non-contact type signal connection means, specifically, transmission / reception of optical signals. . Therefore, it is not necessary to use a signal line or the like, and it is possible to realize reliable signal connection with high reliability by eliminating the noise received by the signal line and the influence of the surrounding environment.

  In the present embodiment, the optical signal method is used as the signal transmission / reception method. However, other methods that do not use the signal line, such as a magnetic method and a vibration transmission method, may be employed.

  As described above, according to the present invention, the control unit is integrally mounted on the upper part of the compressor housing to realize the downsizing of the hermetic electric compressor, and the electrical connection between the control unit and the compressor The signal connection can be reliably performed in a small space while preventing noise and the like, and can be applied to an air conditioner, a refrigerator, a vending machine, or the like.

The figure which shows the outdoor unit of the air conditioning apparatus which mounts the sealed electric compressor in embodiment of this invention Front view schematically showing the hermetic electric compressor The top view which shows an example of an internal structure of the control unit of the sealed electric compressor Sectional drawing which shows the structure of the control unit side connector part and compressor main body side connector part of the sealed electric compressor in embodiment of this invention The perspective view which shows schematic structure of the outdoor unit in the conventional separation-type air conditioner Drive circuit diagram for driving the compressor by inverter control

10 Outdoor unit (main unit)
DESCRIPTION OF SYMBOLS 11 Exterior part 12 Outdoor heat exchanger 13 Blower fan 14 Blower motor 16 Compressor 17 Compressor main body 18 Control unit 21 Refrigerant suction pipe 22 Compression mechanism part 23 Motor part 24 Refrigerant discharge pipe 25 Base 32 Side plate part 33 Bottom plate part 35 Housing 36 Rectifier circuit section 37 Switching circuit section 38 Control circuit section 39 Discharge pipe penetrating section 71 (Control unit side) Connector section 72 (Compressor body side) Connector section 73, 77 Connector body 74, 78 Converter 75, 79 Transmission / reception terminal 70 , 81, 84 Wiring 82, 83 Elastic body

Claims (4)

A control unit having a drive circuit unit built in the housing, and a compressor housing having a compression mechanism unit and a motor unit driven and controlled by the control unit, the control unit being mounted on the compressor housing In addition, the first connection portion provided to be coupled and supported to the casing of the control unit and the second connection portion provided to be coupled and supported to the compressor casing are engaged to perform signal connection . The hermetic electric compressor is characterized in that the signal connection between the first connection part and the second connection part is signal-connected by electrically non-contact type signal connection means. The at least one of the first connection part coupled and supported by the casing of the control unit and the second connection part coupled and supported by the compressor casing is coupled and supported by an elastic body. The hermetic electric compressor described. 2. The hermetic electric compressor according to claim 1, wherein the signal connection means is signal connection means using an optical signal transmission system. The hermetic electric compressor according to any one of claims 1 to 3, wherein a heat insulating material is disposed between the compressor housing and the housing of the control unit.