JP2019143605A - Motor compressor - Google Patents

Abstract

To provide a motor compressor in which connection strength of an electric circuit part and a connection terminal has been improved.SOLUTION: A filter circuit part 4 comprises a filter circuit board 66 and a support member 67. The support member is integrally molded with a bag-shaped nut member 69. The filter circuit board and a power supply side connection terminal 31 are fastened together with screws 93 to the nut member. The filter circuit board and the power supply side connection terminal are electrically connected. The support member is formed with a guide part 76 for restricting the positional deviation of the power supply side connection terminals in co-fastening and securing an insulation distance between the power supply side connection terminals.SELECTED DRAWING: Figure 29

Description

  The present invention relates to an electric compressor in which an electric circuit portion to which a connection terminal is connected is attached in a housing portion formed in a housing.

  Conventionally, as an electric compressor used for an air conditioner for a vehicle, an inverter-integrated electric compressor in which an inverter circuit unit is mounted in an inverter housing unit formed on the outer surface of the housing is used in consideration of switching noise. It has been.

  The inverter circuit unit is also provided with a filter mold assembly (electric circuit unit) including an electrical component such as a smoothing capacitor for absorbing a high-frequency component of the switching current, and this filter mold assembly is also mounted in the inverter housing unit. (For example, refer to Patent Document 1).

JP 2017-172509 A

  Here, the filter mold assembly is connected to the high power connector. Conventionally, the terminal plate of the filter mold assembly is connected to the high power connector via a conductive member called an EMC bus bar assembly. Was extremely complicated. Therefore, it is conceivable to directly attach the connection terminal extending from the high power connector to the filter mold assembly, but in this case, there arises a problem that the connection strength is weakened.

  The present invention has been made to solve the conventional technical problems, and an object thereof is to provide an electric compressor having improved connection strength between an electric circuit portion and a connection terminal.

  The electric compressor of the present invention includes a housing in which a motor is built in and an electric circuit portion to which connection terminals are connected, and this electric circuit portion is attached in a housing portion formed on the outer surface of the housing. The electric circuit portion includes a circuit board and a resin support member that supports the circuit board. A bag-shaped nut member is integrally molded with the support member. The circuit board and the connection terminal are fastened together with screws, the circuit board and the connection terminal are electrically connected, and the support member regulates the displacement of the connection terminal at the time of joint fastening, and insulation between the connection terminals A guide portion for securing a distance is formed.

  In the electric compressor of the invention of claim 2, in the above invention, the electric circuit section is a filter circuit section for absorbing a high frequency component of the switching current, and the connection terminal is a power supply side connection terminal for power supply. It is characterized by.

  According to a third aspect of the present invention, there is provided an electric compressor including an inverter circuit unit for supplying power to the motor in the above invention, wherein the filter circuit unit has a filter side connection terminal for electrically connecting to the inverter circuit unit, The circuit portion and the filter circuit portion are housed in the housing portion and detachably attached to the housing, and the inverter circuit portion and the filter circuit portion are connected by a filter side connection terminal.

  According to the present invention, in the electric compressor including the housing in which the motor is incorporated and the electric circuit portion to which the connection terminal is connected, the electric circuit portion is attached in the accommodating portion configured on the outer surface of the housing. The electric circuit section includes a circuit board and a resin support member that supports the circuit board. A bag-shaped nut member is integrally molded with the support member, and the nut member is connected to the circuit board. Since the terminals are fastened together with screws and the circuit board and the connection terminals are electrically connected, the circuit board and the connection terminals can be connected with a highly rigid connection structure.

  In particular, since the connection terminals can be directly connected to the circuit board, the cost can be reduced by reducing the number of components. Further, assembly and removal are easier than solder connection, and the support member and the circuit board are also integrated by screwing together, so that the rigidity of the circuit board can be improved.

  Moreover, since the bag-shaped nut member is used, the waste generated when the screws are tightened can be stored in the nut member, and the inconvenience caused by the diffusion of the waste is also eliminated. Furthermore, since the guide member for restricting the displacement of the connection terminals at the time of tightening and securing the insulation distance between the connection terminals is formed on the support member, the workability of screwing is also improved.

  The invention is particularly suitable when the electric circuit portion is a filter circuit portion for absorbing a high frequency component of the switching current and the connection terminal is a power supply side connection terminal for power supply as in the invention of claim 2. It is.

  According to a third aspect of the present invention, an inverter circuit unit for supplying power to the motor is provided, and when the filter circuit unit has a filter side connection terminal for electrical connection to the inverter circuit unit, the inverter circuit unit and the filter The circuit part is housed in the housing part and is detachably attached to the housing, and the inverter circuit part and the filter circuit part are connected by the filter side connection terminal, so that the connection between the inverter circuit part and the filter circuit part and the housing Can be easily attached to and detached from the camera.

It is a vertical side view of the inverter-integrated electric compressor of one embodiment to which the present invention is applied. It is the top view seen from the inverter accommodating part side (one end side) of the state which removed the cover member of the electric compressor of FIG. It is an expansion vertical side view of the part of the inverter accommodating part of the electric compressor of FIG. It is a perspective view of the inverter circuit part of the electric compressor of FIG. It is a perspective view of the back surface of the inverter circuit part of FIG. It is a perspective view of the sleeve assembly of the inverter circuit part of FIG. FIG. 7 is a rear perspective view of the sleeve assembly of FIG. 6. It is a perspective view of the terminal connection part of the sleeve assembly of FIG. It is a perspective view of the power module of the inverter circuit part of FIG. It is a vertical side view of the switching element part of the power module of FIG. It is a perspective view of the installation plate of the power module of FIG. FIG. 10 is an exploded perspective view of the power module of FIG. 9. It is a disassembled perspective view of the inverter circuit part of FIG. It is a perspective view of the filter circuit part of the electric compressor of FIG. It is a perspective view of the back surface of the filter circuit part of FIG. It is a perspective view of the supporting member of the filter circuit part of FIG. It is a perspective view of the back surface of the supporting member of FIG. It is a perspective view of the nut member of the filter circuit part of FIG. It is a vertical side view of the nut member of FIG. It is a perspective view of the filter side connection terminal of the filter circuit part of FIG. It is a disassembled perspective view of the filter circuit board and support member of the filter circuit part of FIG. It is a figure explaining the procedure which attaches an inverter circuit part and a filter circuit part to the inverter accommodating part of the electric compressor of FIG. It is a figure explaining the procedure which attaches an inverter circuit part to the inverter accommodating part of the electric compressor of FIG. It is an enlarged plan view of the inverter accommodating part of the motor side connection terminal part of the electric compressor of FIG. It is a vertical side view of the inverter accommodating part of the motor side connection terminal part of the electric compressor of FIG. It is a top view of the motor side connection terminal of the electric compressor of FIG. It is a figure explaining the attachment procedure of the motor side connection terminal of the electric compressor of FIG. It is a figure explaining the procedure which attaches a filter circuit part to the inverter accommodating part of the electric compressor of FIG. It is a figure explaining the procedure which attaches a power supply side connection terminal to the filter circuit part of FIG. FIG. 15 is an enlarged perspective view of a state in which a power supply side connection terminal is attached to the filter circuit unit of FIG. 14. FIG. 30 is a perspective view of a filter circuit portion of the inverter accommodating portion with the power supply side connection terminal shown in FIG. 29 attached.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a longitudinal side view of an electric compressor 1 according to an embodiment to which the present invention is applied. FIG. 2 is a plan view of the electric compressor 1 as viewed from the inverter accommodating portion 8 side (one end side) in a state where a lid member 11 is removed. FIG. 3 and FIG. 3 are enlarged vertical sectional side views of a portion of the inverter accommodating portion 8 of the electric compressor 1.

(1) Overall Configuration of Electric Compressor 1 An electric compressor 1 according to an embodiment is a so-called inverter-integrated electric compressor, and is a part of a refrigerant circuit of a vehicle air conditioner that air-conditions a vehicle compartment (not shown). It constitutes. The electric compressor 1 absorbs a high-frequency component of a switching current, a motor 6, a housing 2 containing a compression mechanism 7 driven by the rotating shaft 5 of the motor 6, an inverter circuit unit 3 that drives the motor 2, and the like. The filter circuit part 4 is provided as an electric circuit part for this purpose.

  On the outer surface of the housing 2 of the embodiment, an inverter accommodating portion 8 serving as a accommodating portion is configured on one end side in the axial direction of the rotating shaft 5 of the motor 6, and an opening 9 of the inverter accommodating portion 8 is The lid member 11 is closed so that it can be opened and closed. And the inverter circuit part 3 and the filter circuit part 4 are each accommodated in this inverter accommodating part 8 from the axial direction of the rotating shaft 5 of the motor 6, and it is comprised so that it can attach to the housing 2 so that attachment or detachment is possible. .

  In addition, in each figure, although the electric compressor 1 of the Example is shown with the inverter housing portion 8 facing up, in actuality, the inverter housing portion 8 is arranged in the lateral direction so as to be on one side. is there.

  The motor 6 of the embodiment is composed of a three-phase synchronous motor (brushless DC motor), and the compression mechanism 7 is, for example, a scroll type compression mechanism. The compression mechanism 7 is driven by the rotating shaft 5 of the motor 6 to compress the refrigerant and discharge it into the refrigerant circuit. And the low-temperature gas refrigerant | coolant suck | inhaled from the evaporator (also called heat absorber) which also comprises a part of refrigerant circuit is distribute | circulated through the housing 2. As shown in FIG. Therefore, the inside of the housing 2 is cooled. And the inverter accommodating part 8 is divided with the inside of the housing 2 in which the motor 6 is accommodated by the partition 12 used as the bottom face of the said inverter accommodating part 8, and this partition 12 is also cooled with a low-temperature gas refrigerant.

(2) Configuration of Inverter Circuit Unit 3 Next, the configuration of the inverter circuit unit 3 will be described with reference to FIGS. The inverter circuit unit 3 includes a power module 14 on which six power switching elements 13 (IGBTs in the embodiment) that constitute the arm of each phase of the three-phase inverter circuit, and an inverter control board on which the control circuit 16 is mounted. 17 and a resin sleeve assembly 18 having a plurality (5 in the embodiment) of terminal connection portions 19, 20, 21, 22, and 23.

  The inverter circuit unit 3 converts DC power fed from a vehicle battery (not shown) into three-phase AC power and feeds it to the stator coil 27 of the motor 6. Therefore, the connection point between the upper arm side power switching element 13 and the lower arm side power switching element 13 of each phase is connected to the lead terminals 24, 25, 26 that are drawn from the partition wall 12 of the housing 2 and protrude in the axial direction. The power terminal of the power switching element 13 on the upper arm side and the ground terminal of the power switching element 13 on the lower arm side are connected to the filter circuit unit 4 through the three motor side connection terminals (connection terminals) 28. It will be connected to the power harness from the battery mentioned above via the power connector (HV connector) 29.

  In this case, the lead terminals 24 to 26 to which the connection points of the upper arm side power switching element 13 and the lower arm side power switching element 13 of each phase are connected penetrate the partition wall 12 and the motor 6 in the housing 2. The stator coil 27 is connected. In addition, the power supply terminal and the ground terminal are the filter circuit unit 4, the power supply side connection terminal (connection terminal) 31 respectively provided at the tips of the two wires 98 drawn from the high power connector 29, and It is electrically connected to the power harness through the high power connector 29 and the like.

(2-1) Configuration of Sleeve Assembly 18 Next, the configuration of the sleeve assembly 18 will be described with reference to FIGS. The sleeve assembly 18 is provided with the five terminal connection portions 19, 20, 21, 22, and 23 described above, and the sleeve assembly 18 further has six sleeves 32. Each of the terminal connection portions 19 to 23 is composed of a male male screw as shown in FIG. 8 in the embodiment, and an embedded portion 33 (becomes a screw head) in which fine irregularities are formed on the outer surface. A thread groove 34 protruding from the embedded portion 33 is provided. The sleeve 32 is made of a metal cylinder having a predetermined length.

  And these terminal connection parts 19-23 and the sleeve 32 are resin-molded integrally with the sleeve assembly 18 by insert molding of insulating hard resin. At this time, only the embedded portion 33 of each terminal connection portion 19 to 23 is embedded in the hard resin of the sleeve assembly 18, and the thread groove 34 protrudes upward from the surface of the sleeve assembly 18. Moreover, the terminal connection parts 19-21 are arrange | positioned in the position which becomes the extraction terminals 24-26 side, and the terminal connection parts 22 and 23 are arrange | positioned in the position which becomes the filter circuit part 4 side. Further, each sleeve 32 is disposed in the peripheral portion of the sleeve assembly 18, and upper and lower ends are exposed and opened on the front and back surfaces of the sleeve assembly 18, and a bolt 36 for fixing to the housing 2 described later can be inserted. .

  In addition, at predetermined positions on the surface of the sleeve assembly 18, three positioning pins 37 for the inverter control board 17 are integrally formed and protruded by hard resin. Furthermore, at predetermined positions on the back surface of the sleeve assembly 18, positioning pins 38 with the power module 14 are integrally formed and protruded at four locations by hard resin. Furthermore, at predetermined positions on the back surface of the sleeve assembly 18, two positioning pins 39 with respect to the housing 2 are integrally formed and protruded by hard resin.

  Further, a plurality of (18) insertion holes 42 are formed in the central portion of the sleeve assembly 18 to allow the source, emitter, and drain terminals 41 of the power switching elements 13 mounted on the power module 14 to pass therethrough. Yes. As will be described later, the sleeve assembly 18 has a predetermined thickness dimension that can ensure at least an insulation distance (shortest insulation distance) between the inverter control board 17 and the power module 14 (a later-described installation plate 43).

(2-2) Configuration of Power Module 14 The configuration of the power module 14 will be described with reference to FIGS. The power module 14 is configured by mounting six power switching elements 13 on an installation plate 43 made of a highly heat-dissipating metal plate (aluminum in the embodiment). In this case, three fitting holes 44 are formed in the installation plate 43 in two rows at predetermined intervals, for a total of six places, and the counterbore 46 is recessed in the surface of each fitting hole 44. Is formed.

  Then, a male screw 47 is press-fitted and fixed to each fitting hole 44 from the back side, and is erected on the installation plate 43. Each male screw 47 has a thread groove portion 48 of each male screw 47 protruding from the surface of the installation plate 43 in a fitted state, and includes a countersink portion 46 and a portion other than the screw groove portion 48 of each male screw 47. The resin coating material 49 is molded on the outer surface of the male screw 47. In this state, the resin coating material 49 covers each male screw 47 with the screw groove portion 48 of the male screw 47 exposed (FIG. 11).

  On the other hand, a through hole 51 is formed in each power switching element 13. And it arrange | positions on the installation plate 43 (surface) through the insulating sheet 52 in the form which penetrates each male screw 47 to this through-hole 51. FIG. In this case, two insulating sheets 52 are used across the power switching elements 13 in each row, and three through holes 53 are formed in each insulating sheet 52, and each male screw 47 is connected to this insulating sheet 52. The through hole 53 of the power switching element 13 and the through hole 51 of the power switching element 13 pass through, and the thread groove 48 protrudes from the power switching element 13.

  Further, in a state where each power switching element 13 is arranged on the installation plate 43, the terminals 41 of the power switching elements 13 in each row are adjacent to each other at the center of the installation plate 43 and above the installation plate 43 ( It is bent in the direction of standing up from the surface. In this state, each power switching element 13 is fastened and fixed to the installation plate 43 by screwing the nut 54 into the thread groove portion 48 of each male screw 47, thereby configuring the power module 14. In this state, the resin coating material 49 is interposed between the power switching element 13 and the insulating sheet 52 and the male screw 47 (FIG. 10).

  When the nut 54 is screwed into the male screw 47, a predetermined jig is used so that each power switching element 13 does not rotate. In this manner, the six male screws 47 erected on the installation plate 43 and the resin coating material 49 that covers each male screw 47 in a state where the screw groove portion 48 of each male screw 47 is exposed are provided. The switching element 13 and the insulating sheet 52 are arranged on the installation plate 43 in a state where the male screw 47 penetrates, and are fixed to the installation plate 43 by a nut 54 that is screwed into the screw groove portion 48, whereby each power switching element 13 is Since the power module 14 is configured by being mounted on the installation plate 43 via the insulating sheet 52, each male screw 47 plays a role in positioning the power switching element 13 and the insulating sheet 52 with respect to the installation plate 43. .

  As a result, the assembling workability is remarkably improved, and it is not necessary to provide a special positioning means, so that the size can be reduced. In particular, since the resin coating material 49 is interposed between the power switching element 13 and the insulating sheet 52 and the male screw 47 while being fixed to the installation plate 43 by the nut 54, the male screw 47 and the power switching are performed. Insulation with the element 13 can be secured without any trouble.

  In particular, in the embodiment, each male screw 47 is press-fitted and fixed to the installation plate 43, and the resin coating 49 is molded on the outer surface of the male screw 47, so that further assembling workability is improved. It can also contribute significantly to the improvement of space saving.

  In the peripheral portion of the installation plate 43, five insertion holes 56 are formed at positions corresponding to the predetermined sleeve 32 of the sleeve assembly 18 described above. Further, six positioning holes 57 are formed through the positions corresponding to the positioning pins 38 and 39 formed on the back surface of the sleeve assembly 18.

(2-3) Configuration of Inverter Control Board 17 The control circuit 16 of the inverter control board 17 performs switching control of each power switching element 13 of the power module 14 based on a command from the outside. Moreover, it has the function to transmit the drive state of the motor 6 to the exterior, and is comprised by connecting circuit components, such as a microcomputer, by printed wiring.

  Further, five terminal connection holes 58 are formed on the periphery of the inverter control board 17 at positions corresponding to the terminal connection portions 19, 20, 21, 22, and 23 of the sleeve assembly 18 described above. Further, eight insertion holes 59 are formed in the peripheral portion of the inverter control board 17 including positions corresponding to the respective sleeves 32 of the sleeve assembly 18. Furthermore, three positioning holes 61 are formed at positions corresponding to the positioning pins 37 formed on the surface of the sleeve assembly 18. A plurality of terminal connection holes 62 (18 places) are also formed at positions corresponding to the respective insertion holes 42 of the sleeve assembly 18.

(2-4) Assembly procedure of inverter circuit unit 3 With the above configuration, an assembly procedure of the inverter circuit unit 3 will be described next. The inverter circuit unit 3 integrates the inverter control board 17, the sleeve assembly 18, and the power module 14 in a subline. At that time, first, as shown in FIG. 13, the inverter control board 17 on which the control circuit 16 is mounted is on the upper side, the power module 14 on which the power switching element 13 is mounted on the lower side, and the inverter control board 17 and the power module 14 The inverter control board 17, the sleeve assembly 18, and the power module 14 are sequentially stacked with the sleeve assembly 18 interposed therebetween.

  At this time, the positioning pins 37 on the surface of the sleeve assembly 18 enter the positioning holes 61 of the inverter control board 17 and protrude from the inverter control board 17, respectively. The positioning pins 38 and 39 on the back surface of the sleeve assembly 18 are the power modules. The four positions enter the positioning holes 57 and protrude from the power module 14, so that the positions of the three parties are determined with high accuracy.

  In such a stacked state, each insertion hole 56 of the power module 14 corresponds to the back side of the five sleeves 32 of the sleeves 32 of the sleeve assembly 18, and each insertion hole 59 of the inverter control board 17. Six of these insertion holes 59 correspond to the surface side of each sleeve 32 of the sleeve assembly 18. The terminal connection portions 19 to 23 provided in the sleeve assembly 18 pass through the terminal connection holes 58 formed in the inverter control board 17 and protrude to the surface side of the inverter control board 17. Further, the terminals 41 of the respective power switching elements 13 of the power module 14 pass through the respective insertion holes 42 of the sleeve assembly 18 and protrude slightly from the terminal connection holes 62 of the inverter control board 17 to the surface side of the inverter control board 17. To do.

  In this state, each positioning pin 37 projecting from the inverter control board 17 and each positioning pin 38 projecting from the power module 14 are heat caulked, whereby the inverter control unit 17, the sleeve assembly 18, and the power module 14 are Integrate. Further, the terminal 41 of the power switching element 13 protruding from each terminal connection hole 62 is soldered to the inverter control circuit 17 to electrically connect the power switching element 13 and the inverter control board 17.

  By such heat caulking and soldering, the inverter control board 17, the sleeve assembly 18, and the power module 14 are integrated in a subline (FIGS. 4 and 5). At this time, since the resin sleeve assembly 18 has a predetermined thickness, the sleeve assembly 18 serves as a spacer interposed between the inverter control block 17 and the power module 14. The insulation distance between the two is ensured in the shortest time.

  As described above, the positioning pins 37 and 38 of the inverter control board 17 and the power module 14 are provided on the sleeve assembly 18, and the positioning pins 37 and 38 are inserted with the sleeve assembly 18 sandwiched between the inverter control board 17 and the power module 14. Since the inverter control board 17, the sleeve assembly 18, and the power module 14 are integrated by heat caulking, the inverter control board 17, the sleeve assembly 18, and the power module 14 of the inverter circuit unit 3 are integrated. This eliminates the need for special fasteners such as screws for reducing the number of components and reducing the weight.

  Further, by not using a fastener such as a screw, it is not necessary to secure an insulation distance from them, and it is possible to contribute to downsizing of the inverter circuit unit 3. Furthermore, since the resin sleeve assembly 18 is interposed between the inverter control board 17 and the power module 14 in an integrated state, the insulation distance between the inverter control board 17 and the power module 14 is ensured to be shortest. Is done. In addition, since the influence of the heat generated from the power switching element 13 of the power module 14 on the inverter control board 17 can be blocked by the resin sleeve assembly 18, the miniaturization can be realized also by these. .

  Then, the sleeve assembly 18 is provided with a terminal connection portion 19 to 23 made of an external thread having a thread groove 34 and a sleeve 32 into which a bolt 36 for fixing the inverter circuit portion 3 to the housing 2 is inserted, as will be described later. Since the terminal connecting portions 19 to 23 and the sleeve 32 are integrally resin-molded with the thread groove portion 34 protruding, the sleeve assembly 18 and the inverter circuit portion 3 have a highly rigid structure, and vibration resistance can be improved. become able to.

(3) Configuration of Filter Circuit Unit 4 Next, the configuration of the filter circuit unit 4 will be described with reference to FIGS. The filter circuit unit 4 includes a relatively large smoothing capacitor (electrolytic capacitor) 63 connected between the power supply terminal and the installation terminal of the three-phase inverter circuit, and a relatively large coil 64 connected to the power supply terminal. The filter circuit board 66 as a circuit board on which the electric parts are mounted, and a support member 67 made of a hard resin that accommodates the capacitors 63 and the coils 64 (electric parts).

(3-1) Configuration of Support Member 67 The support member 67 has an opening on one side and has a container (case) shape having a depth dimension sufficient to accommodate the large smoothing capacitor 63 and the coil 64 as described above. In the periphery of the support member 67, five sleeves 68 of a predetermined length made of a metal cylinder are integrally molded with the support member 67 by insert molding of insulating hard resin. Exposed and open on the front and back. In addition, on one end side of the support member 67, there are two bag-shaped metal nut members 69 having fine irregularities formed on the outer surface as shown in FIGS. Molded, exposed at the surface of the support member 67 and opened. The nut members 69 are arranged at a predetermined interval from each other.

  Further, two guide portions 76 are formed on the edge of the support member 67 at a position corresponding to each nut member 69 so as to be formed on the inner side. The guide portions 76 have a predetermined distance from each other. As described later, while the two power supply side connection terminals 31 are electrically connected to the filter circuit board 66, the guide portions 76 are restricted from being displaced. An insulation distance between the connection terminals 31 is secured.

  Furthermore, two filter side connection terminals (connection terminals) 71 are also integrally molded with the other end of the support member 67 in the same manner. Each filter-side connection terminal 71 includes a flat plate terminal portion 72 having a hole 75 as shown in FIG. 20 and a soldering portion 73 bent at a right angle from the flat plate terminal portion 72. Protrudes laterally from the support member 67, and the soldering portion 73 is embedded in the support member 67 so as to protrude from the upper surface. A positioning pin 74 is formed to protrude from the bottom surface of the support member 67.

(3-2) Configuration of Filter Circuit Board 66 The electrical components such as the smoothing capacitor 63 and the coil 64 are mounted on the back side of the filter circuit board 66. Further, four insertion holes 77 are formed in the peripheral portion of the filter circuit board 66 at positions corresponding to the sleeve 68 of the support member 67 described above, and at positions corresponding to the nut members 69 of the support member 67, respectively. The terminal connection holes 78 are formed at two locations on one end side. Further, two terminal connection holes 79 are formed at positions corresponding to the filter side connection terminals 71 of the support member 67 on the other end side of the filter circuit board 66.

(3-3) Procedure for assembling filter circuit unit 4 Next, the procedure for assembling the filter circuit unit 4 with the above configuration will be described. The filter circuit unit 4 also integrates the filter circuit board 66 and the support member 67 in a subline. At that time, first, as shown in FIG. 21, the smoothing capacitor 64 and the coil 64 of the filter circuit board 66 are placed on the lower side, and these are accommodated in the support member 67.

  At this time, the soldered portion 73 of each filter side connection terminal 71 enters the terminal connection hole 79 of the filter circuit board 66 and protrudes slightly from the filter circuit board 66, and each insertion hole 77 extends to each sleeve 68 of the support member 67. Each corresponds. Each terminal connection hole 78 of the filter circuit board 66 corresponds to each nut member 69 of the support member 67.

  In this state, the filter circuit board 66 and the support member 67 are integrated by filling the support member 67 with a thermosetting resin 81 (for example, epoxy resin, shown in FIG. 3). Further, the soldered portion 73 of the filter side connection terminal 71 protruding from each terminal connection hole 79 is soldered to the filter circuit board 66 and electrically connected to the filter circuit board 66. The filter circuit board 66 and the support member 67 are integrated in a sub-line by filling and soldering the thermosetting resin 81 (FIGS. 14 and 15). At this time, the lower end of the sleeve 68 (the end on the housing 2 side) is located at the center in the height direction of the filter circuit portion 4 or in a region near the center (FIG. 3).

  Thus, the filter circuit board 66 and the filter circuit board 66 are filled by filling the support member 67 with the thermosetting resin 81 in a state where the smoothing capacitor 63 and the coil 64 are accommodated in the support member 67 of the filter circuit unit 4 in the subline. The support member 67 is integrated, and one end of the support member 67 is soldered to the filter circuit board 66 and the other end of the support circuit 67 is connected to the inverter circuit unit 3 with terminal connection portions 22 and 23 (male screws) and nuts as will be described later. If the filter-side connection terminals 71 electrically connected at 92 are integrally molded with resin, resin filling and soldering are performed before assembling to the housing 2, and the nut 92 is screwed at the time of assembling. Since only the fastening of the bolts 36 and bolts is sufficient, the assembly workability is significantly improved. Further, the filter-side connection terminal 71 whose one end is soldered to the filter circuit board 66 is resin-molded integrally with the support member 67, so that it has a structure with high rigidity against vibration, and the filter circuit portion 4 is mounted on the housing 2. Even after fixing, no stress is generated in the soldered portion.

(4) Installation procedure of the inverter circuit unit 3 and the filter circuit unit 4 to the housing 2 Next, the inverter circuit unit 3 and the filter circuit unit 4 are mounted to the housing 2 on the main line with reference to FIG. 22 and FIG. The procedure will be described. As shown in FIG. 22 and FIG. 23, the housing 2 is arranged with one end side in the axial direction of the rotating shaft 5 of the motor 6 in which the inverter accommodating portion 8 is configured facing upward. Then, as described above, the inverter circuit unit 3 and the filter circuit unit 4 integrated with each other in the sub-line are individually housed in the inverter housing portion 8 of the housing 2 from the same axial direction (above).

  At this time, two positioning recesses 82 are formed in the partition wall 12 of the housing 2 serving as the bottom surface of the inverter accommodating portion 8 at positions corresponding to the positioning pins 39 of the inverter circuit portion 3, respectively. Eight bolt fixing recesses 83 are formed at positions corresponding to the insertion holes 59 of the third inverter control board 17. Then, as each positioning pin 39 enters the positioning recess 82, the position of the inverter circuit portion 3 with respect to the housing 2 is determined, and in this state, each insertion hole 59 (the sleeve 32 of the sleeve assembly 18, the power module). 14 insertion holes 56) correspond to the respective bolt fixing recesses 83 (FIG. 22).

  In this state, the installation plate 43 of the power module 14 contacts the partition wall 12 as shown in FIG. 3, so that the power switching element 13 is in a heat exchange relationship with the partition wall 12 through the installation plate 43 and is cooled by a low-temperature gas refrigerant. Will be. In FIG. 3, 96 is a recess formed in the partition wall 12 to escape the heat crimped positioning pin 38, and 97 is formed in the partition wall 12 to escape the head of the male screw 47 of the installation plate 43. Is a recessed recess.

  On the other hand, in the partition wall 12 of the housing 2, two positioning recesses 84 are formed at positions corresponding to the respective positioning pins 74 of the filter circuit unit 4, which is opposite to the inverter circuit unit 3 of the filter circuit unit 4. Two bolt fixing recesses 86 are formed at positions corresponding to the two insertion holes 77 (sleeves 68) at the positions on the side. Then, as each positioning pin 74 enters the positioning recess 84, the position of the filter circuit 4 is determined with respect to the housing 2. Thus, by providing the support member 67 with the positioning pins 74 for the housing 2, the filter circuit portion 4 and the housing 2 can be easily positioned.

  At that time, the two insertion holes 77 (sleeves 68) at positions opposite to the inverter circuit section 3 correspond to the respective bolt fixing recesses 86, and each sleeve 68 contacts the housing 2 (partition wall 12). (Fig. 3). On the other hand, a part of the upper edge portion of the support member 67 on the inverter circuit portion 3 side of the filter circuit portion 4 is overlapped with the inverter circuit portion 3, and two insertion holes (sleeves 68) on the inverter circuit portion 3 side are inverters. It corresponds to the two insertion holes 59 of the circuit part 3 respectively (FIG. 22).

  Here, since the smoothing capacitor 64 and the coil 64 of the filter circuit section 4 are relatively large as described above, the height dimension H1 of the filter circuit section 4 is equal to the height dimension H2 of the inverter circuit section 3 as shown in FIG. The inverter circuit unit 3 and the filter circuit unit 4 are detachably attached to the housing 2 with a part of the filter circuit unit 4 overlapped with the inverter circuit unit 3 as in the embodiment. Thus, the filter circuit portion 4 having a large height can be housed and attached in the inverter housing portion 8 without any trouble.

  Further, as will be described later, the filter side connection terminal 71 of the filter circuit section 4 (electric circuit section) can be easily tightened to the terminal connection sections 22 and 23 of the sleeve assembly 18 with the inverter control board 17 and the nut 92. become.

  The sleeves 32 corresponding to the two insertion holes 59 abut against the housing 2 (partition wall 12) (FIG. 3). Further, the flat plate terminal portion 72 of the filter side connection terminal 71 of the filter circuit portion 4 corresponds to the terminal connection portions 22 and 23 of the inverter circuit portion 3, and each of the terminal connection portions 22 and 23 is a flat plate of the filter side connection terminal 71. It becomes a shape entering the hole 75 of the terminal portion 72.

  After the inverter circuit unit 3 and the filter circuit unit 4 are thus arranged in the inverter housing unit 8, the insertion holes 59 (the sleeve 32 and the insertion hole 56) of the inverter circuit unit 3 and the insertions of the filter circuit unit 4 are inserted. The bolt 36 is inserted into the hole 77 (sleeve 68) from the axial direction (above) (FIG. 23), screwed into the bolt fixing recesses 83 and 86, and fastened, whereby the inverter circuit unit 3 and the filter circuit unit 4 are connected. Removably attached to the housing 2 (FIGS. 2 and 3). In this state, the respective terminal connecting portions 19, 20, and 21 of the inverter circuit unit 3 are adjacent to the lead terminals 24, 25, and 26, respectively, and are directed in the same axial direction (upward) as the lead terminals 24, 25, and 26. Protruding.

(5) Connection procedure of each connection terminal 28, 31, 71 Next, the motor side connection terminal 28, the power supply side connection terminal 31, and the filter side connection terminal 71 described above with reference to FIGS. The connection procedure of the connection terminal) will be described. The motor side connection terminal 28 is made of a metal plate, and as shown in FIG. 26, has a flat terminal portion 88 having a hole 87 formed on one end side, and a press contact terminal portion 89 having a predetermined elasticity on the other end side. have.

  Then, three motor side connection terminals 28 are inserted into the inverter accommodating portion 8 from the axial direction (above) of the housing 2, and the lead terminals 24, 25, 26 are inserted into the pressure contact terminal portions 89 of the motor side connection terminals 28. Press-fit each. As a result, the pressure contact terminal portion 89 of each motor side connection terminal 28 is in pressure contact with and electrically connected to each of the lead terminals 24 to 26. Further, the terminal connection portions 19, 20, and 21 are inserted into the holes 87 of the flat plate terminal portions 88, so that the lead terminal 24 and the terminal connection portion 19, the lead terminal 25 and the terminal connection portion 20, and the lead terminal 26 and the terminal connection are connected. The motor side connection terminals 28 are respectively attached across the portions 21.

  In this state, the nut 91 is screwed into the screw groove 34 of each of the terminal connection portions 19 to 21 from above, so that the flat plate terminal portion 88 of each motor side connection terminal 28 is sandwiched between the nut 91 and the inverter control board 17. The flat terminal portion 88 and the inverter control board 17 are fastened together. Thereby, each motor side connection terminal 28 is fastened to each terminal connection part 19-21 via the inverter control board 17. FIG. In this way, each motor side connection terminal 28 is fixed and electrically connected to the inverter control board 17, and the lead terminals 24 to 26 from the motor 6 are electrically connected to the inverter control board 17 by the motor side connection terminal 28. Connect to.

  Further, the nuts 92 are screwed into the screw groove portions 34 of the terminal connection portions 22 and 23 of the inverter circuit portion 3 from above, so that the flat plate terminal portion 72 of the filter side connection terminal 71 is connected by the nut 92 and the inverter control board 17. The flat terminal part 72 and the inverter control board 17 are fastened together. Thereby, the filter side connection terminal 71 is fixed and electrically connected to the inverter control board 17, and the filter circuit board 66 of the filter circuit unit 4 is electrically connected to the inverter control board 17 via the filter side connection terminal 71. Connecting.

  In this way, the inverter control board 17 and the filter side connection terminal 71 of the filter circuit section 4 are fastened to the terminal connection sections 22 and 23 by the nut 92 that is screwed into the thread groove section 34, and the inverter control board 17 and the filter circuit section are thus fastened. 4 is electrically connected, the inverter control board 17 and the filter circuit unit 4 can be connected with a highly rigid connection structure. Further, the inverter circuit unit 3 and the filter circuit unit 4 can be easily connected to and removed from the housing 2.

  In particular, since the filter-side connection terminal 71 of the filter circuit unit 4 can be directly connected to the inverter control board 17, it is possible to reduce costs by reducing the number of components. In addition, assembly and removal are easier than solder connection, and the sleeve assembly 18 and the inverter control board 17 are also integrated by tightening with the nut 92, so that the rigidity of the inverter control board 17 is also improved. Will be able to.

  Further, the two power supply side connection terminals 31 described above are also flat plate terminals with holes 94 formed therein, and these holes 94 are made to correspond to the respective terminal connection holes 78 of the filter circuit section 4 so as to be axially arranged as shown in FIG. The screw 93 is inserted from (above) and screwed into the nut member 69, whereby the power supply side connection terminal 31 and the filter circuit board 66 are fastened together. Thereby, the filter circuit board 66 and the power supply side connection terminal 31 are electrically connected.

  In this way, the bag-shaped nut member 69 is integrally resin-molded on the support member 67 of the filter circuit unit 4, and the filter circuit board 66 and the power supply side connection terminal 31 are jointed to the nut member 69 with the screws 93. Since the filter circuit board 66 and the power supply side connection terminal 31 are electrically connected, the filter circuit board 66 and the power supply side connection terminal 31 can be connected with a highly rigid connection structure. .

  In particular, since the power supply side connection terminal 31 can be directly connected to the filter circuit board 66, the cost can be reduced by reducing the number of components. In addition, it is easier to assemble and remove compared to solder connection, and the support member 67 and the filter circuit board 66 are also integrated by tightening together with the screws 93, so that the rigidity of the filter circuit board 66 is also improved. Will be able to.

  Moreover, since the bag-shaped nut member 69 is used, the waste produced when the screws 93 are tightened together can be stored in the nut member 69. The occurrence of such inconveniences can be prevented.

  At this time, each power supply side connection terminal 31 enters and is held by each guide portion 76 formed on the support member 67 (FIG. 30). Thereby, since the positional deviation of each power supply side connection terminal 31 is regulated, the screwing workability is improved, and the insulation distance between each power supply side connection terminal 31 is also secured (FIG. 31). Finally, the lid member 11 is detachably attached to the opening 9 of the inverter accommodating portion 8, and the opening 9 of the inverter accommodating portion 8 is closed so as to be opened and closed (FIG. 1).

  As described above, the inverter control board 17, the sleeve assembly 18, and the power module 14 of the inverter circuit unit 3 are integrated, and the filter circuit board 66 and the support member 67 of the filter circuit unit 4 are integrated. The inverter circuit unit 3 and the filter circuit unit 4 are individually housed in the inverter housing unit 8 from the same direction and are detachably attached to the housing 2. Each can be separately accommodated in the inverter accommodating portion 8, and the degree of freedom in the assembling process when the inverter circuit portion 3 and the filter circuit portion 4 are attached to the housing 2 is increased, and the assembly workability of the electric compressor 1 is increased. Will be able to improve.

  In this case, since the soldering of the inverter circuit unit 3, the soldering of the filter circuit unit 4, and the resin filling can be performed on the subline before the assembly to the housing 2, man-hours on the main line can be reduced. become able to. Further, since the inverter circuit unit 3 and the filter circuit unit 4 are provided separately, the degree of freedom in design is increased in their arrangement, and the space for the inverter housing unit 8 can be saved. Furthermore, since the relatively large filter circuit unit 4 is provided separately from the inverter circuit unit 3, vibration resistance is improved, and the filter circuit unit 4 is extremely suitable as an electric compressor used in a vehicle air conditioner.

  In particular, since the inverter circuit portion 3 and the filter circuit portion 4 can be accommodated in the inverter accommodating portion 8 from the same direction, when the inverter circuit portion 3 and the filter circuit portion 4 are attached to the housing 2, There is no need to change the orientation, and the assembly work becomes even better.

  For example, as in the embodiment, the inverter accommodating portion 8 is configured on one end side of the housing 2 in the axial direction of the rotating shaft 5 of the motor 6, and the inverter circuit portion 3 and the filter circuit portion 4 are arranged on the axis of the rotating shaft 5 of the motor 6. If each is individually housed in the inverter housing portion 8 from the direction and is detachably attached to the housing 2, the inverter circuit portion 3 and the filter circuit portion 4 are placed upward with the one end side of the housing 2 facing upward as described above. Thus, it can be easily installed in the inverter accommodating portion 8.

  In the embodiment, the motor side connection terminals 28 connected to the lead terminals 24 to 26 of the motor 6 and the filter side connection terminals 71 of the filter circuit part 4 are fixed to the terminal connection parts 19 to 23 of the sleeve assembly 18, respectively. Since the inverter control board 17 is electrically connected, the inverter control board 17 can be electrically connected to the motor 6 and the filter circuit unit 4 without any trouble.

  In this case, the motor side connection terminal 28 connected to the inverter control board 17 and the lead terminals 24 to 26 of the motor 6 is jointly fastened to the terminal connection portions 19 to 23 by the nut 91 screwed into the screw groove portion 34, and the inverter Since the control board 17 and the lead terminals 24 to 26 are electrically connected, the motor side connection terminal 28 connected to the lead terminals 24 to 26 of the motor 6 is connected to the inverter control board 17 with a high rigidity. You will be able to connect with.

  Further, in the embodiment, each terminal connection portion 19 to 23 is constituted by a male screw having a thread groove portion 34, and the sleeve assembly 18 is assumed to be resin-molded. 23 is integrally resin-molded, the rigidity of the sleeve assembly 18 and the terminal connection portions 19 to 23 is increased, and the earthquake resistance is remarkably improved.

  Then, as in the embodiment, each terminal connection portion is connected via the inverter control board 17 by nuts 91 and 92 that screw the motor side connection terminal 28 and the filter side connection terminal 71 into the screw groove portions 34 of the terminal connection portions 19 to 23. By fastening to 19 to 23, the motor side connection terminal 28 and the filter side connection terminal 71 can be firmly fastened, the connection strength and rigidity can be improved, and the structure resistant to vibration can be obtained.

  Furthermore, the sleeve 32 is integrated with the sleeve assembly 18 by integrally resin-molding the sleeve 32 into which the bolt 36 for fixing the inverter circuit portion 3 to the housing 2 is inserted into the sleeve assembly 18 as in the embodiment. Thus, the number of parts can be reduced and the rigidity of the inverter circuit unit 3 can be improved.

  In addition, terminal connection portions 19 to 21 having screw groove portions 34 are provided in the inverter circuit portion 3, and a flat terminal portion 88 is provided on the motor side connection terminal 28, and the flat terminal portion 88 is connected to the terminal connection portion 19. Since it is electrically connected to the inverter circuit unit 3 by being fixed to the inverter control board 17 of the inverter circuit unit 3 by the nut 91 screwed into the thread groove 34 of ˜21, the motor side connection terminal 28 And the inverter circuit unit 3 are mechanically fastened so that the connection strength between the motor side connection terminal 28 and the inverter circuit unit 3 can be maintained even when an external force is applied by vibration or heat. become.

  As a result, it is possible to effectively eliminate the occurrence of poor connection due to a decrease in holding force accompanying the creep phenomenon. The terminal connecting portions 19 to 21 are resin-molded integrally with the sleeve assembly 18 in a state where the screw groove portion 34 protrudes, and the screw groove portion 34 protrudes through the inverter control board 17, and the nut 91. Are screwed into the screw groove portions 34 of the terminal connection portions 19 to 21, so that the flat plate terminal portion 88 of the motor side connection terminal 28 is sandwiched between the nut 91 and the inverter control board 17, and in this state, the flat plate terminal portion 88 is controlled by the inverter. Since it is electrically connected to the substrate 17, the strength and rigidity of the inverter circuit portion 3 around the terminal connection portions 19 to 21 to which the motor side connection terminals 88 are connected can be improved.

  Further, since the motor side connection terminal 28 is provided with a pressure contact terminal portion 89 which is in pressure contact with and electrically connected to the lead terminals 24 to 26 of the motor 6, the lead terminal 24 to 26 side is subjected to pressure contact as in the prior art. Thus, the motor side connection terminal 28 can be easily connected.

  In this case, in the embodiment, since the terminal connection portions 19 to 21 protrude in the same direction as the lead terminals 24 to 26 in a state where the inverter circuit portion 3 is accommodated in the inverter accommodating portion 8, the motor side connection terminals 28 are provided. The direction in which the pressure contact terminal portion 89 is connected to the lead terminals 24 to 26 of the motor 6 by pressure contact and the direction in which the flat plate terminal portion 88 is fixed to the terminal connection portions 19 to 21 of the inverter circuit portion 3 with the nut 91 coincide. As a result, the workability of assembling the motor side connection terminal 28 is improved.

  In the embodiment, the sleeve assembly 18 is provided with the positioning pin 39 for the housing 2, so that the positioning with the housing 2 when the inverter circuit portion 3 is attached to the inverter accommodating portion 8 can be easily performed.

  Further, as described above, a sleeve 68 having a predetermined length dimension through which a bolt 36 for fixing the filter circuit portion 4 to the housing 2 is inserted is resin-molded integrally with the support member 67 of the filter circuit portion 4. 4 is fixed to the housing 2 by the bolt 36 in a state where the sleeve 68 is in contact with the housing 2, the position where the filter circuit portion 4 contacts the housing 2 is as shown in FIG. 3. The length dimension of the housing 2 approaches the partition wall 12 side. As a result, the vibration of the filter circuit unit 4 when vibration during traveling of the vehicle is applied to the electric compressor 1 can be reduced, and the inconvenience that breakage occurs in each part can be suppressed.

  In particular, the filter circuit when the vibration is applied by positioning the end of the sleeve 68 on the housing 2 side in the center in the height direction of the filter circuit part 4 or in the vicinity of the center as in the embodiment. The vibration of the part 4 can be effectively reduced.

  In the embodiment, the filter circuit unit 4 is used as an electric circuit unit, and the power supply side connection terminal 31 is used as a connection terminal. However, the invention of claim 1 is not limited thereto, and various electric components to which various connection terminals are connected are provided. It can be applied to the electric circuit section provided. Further, the shape and structure of the inverter circuit unit 3, the filter circuit unit 4, and the housing 2 shown in the embodiments are not limited thereto, and various changes can be made without departing from the spirit of the present invention. Not too long.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Housing 3 Inverter circuit part 4 Filter circuit part (electric circuit part)
DESCRIPTION OF SYMBOLS 6 Motor 8 Inverter accommodating part 12 Bulkhead 13 Power switching element 14 Power module 16 Control circuit 17 Inverter control board 18 Sleeve assembly 19-23 Terminal connection part 24-26 Lead terminal 28 Motor side connection terminal (connection terminal)
31 Power supply side connection terminal (connection terminal)
32, 68 Sleeve 34 Thread groove 36 Bolt 37-39, 74 Positioning pin 43 Installation plate 47 Male screw 49 Resin coating material 52 Insulation sheet 54, 91, 92 Nut 63 Smooth capacitor (electric part)
64 coils (electrical parts)
66 Filter circuit board (circuit board)
67 Support member 69 Nut member 71 Filter side connection terminal (connection terminal)
88 Flat terminal part 89 Press contact terminal part 93 Screw

Claims (3)

In an electric compressor comprising a housing with a built-in motor and an electric circuit part to which a connection terminal is connected, the electric circuit part being mounted in a housing part formed on the outer surface of the housing,
The electrical circuit unit includes a circuit board and a resin support member that supports the circuit board,
The support member is integrally molded with a bag-shaped nut member. The circuit board and the connection terminal are fastened together with screws to the nut member, and the circuit board and the connection terminal are electrically connected. Connected,
The electric compressor according to claim 1, wherein a guide portion is formed on the support member to restrict a displacement of the connection terminals when tightened and to secure an insulation distance between the connection terminals.   2. The electric compression according to claim 1, wherein the electric circuit unit is a filter circuit unit for absorbing a high frequency component of a switching current, and the connection terminal is a power supply side connection terminal for supplying power. Machine. An inverter circuit for supplying power to the motor;
The filter circuit unit has a filter-side connection terminal for electrically connecting to the inverter circuit unit,
The inverter circuit portion and the filter circuit portion are housed in the housing portion and detachably attached to the housing, and the inverter circuit portion and the filter circuit portion are connected by the filter side connection terminal. The electric compressor according to claim 2.

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