JP6023973B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compression system including an electric motor for driving a compression mechanism, an inverter for driving the electric motor, and a power relay terminal (hereinafter referred to as a terminal) for electrical connection between the inverter and the electric motor. Related to the machine.

  Conventionally, in this type of electric compressor, a terminal for making an electrical connection between the inverter and the electric motor is provided in the compressor container. In the compressor container, the cluster block of the electric motor is connected to the metal terminal of the terminal, and the connection portion between the metal terminal and the connection terminal to which the lead wire of the electric motor is connected is covered by the cluster block housing. (For example, refer to Patent Document 1).

JP 2005-307798 A

  However, in the conventional configuration, when the electric compressor stops operating, the gaseous refrigerant remaining inside the compressor stagnates, the liquefied refrigerant accumulates inside the compressor, and there are conductive parts such as metal terminals and connection terminals. When immersed in the liquid refrigerant, the metal terminal exposed part not covered by the housing of the cluster block and the connecting part between the metal terminal covered by the housing and the connection terminal are also passed through the open part provided in the manufacture or assembly of the housing. The conductive part and the compressor container are conducted through the liquid refrigerant, and the conductive part and the compressor container cannot be insulated. When the operation of the electric compressor is started in this state, there is a problem that the current supplied to the conductive portion leaks to the compressor container via the liquid refrigerant.

  The present invention solves the above-described conventional problems, and an object thereof is to provide an electric compressor having improved insulation between a conductive portion and a compressor container.

  In order to solve the conventional problems, an electric compressor according to the present invention includes an electric motor that drives a compression mechanism and an inverter that controls the driving of the electric motor, and the electric motor and the inverter are electrically connected. The terminal to be connected penetrates the partition wall that partitions the electric motor housing portion and the inverter housing portion of the compressor container, and the cluster block located on the electric motor housing portion side is connected to the metal terminal of the terminal In the electric compressor, a cover that covers the entire cluster block is provided, and the cover has a first insertion hole through which the metal terminal can be inserted and a second insertion hole through which the lead wire of the electric motor can be inserted. In addition, the outer periphery of the first insertion hole covers the outer periphery of the metal terminal to ensure an insulation distance between the metal terminal and the partition wall of the compressor container. Part is a structure in which a.

  This suppresses the exposure of the conductive parts such as the metal terminals of the terminals and the connection terminals of the cluster block, and further extends the insulation distance between the electric motor housing part of the compressor container and the partition wall between the inverter housing parts. Insulation can be improved.

The electric compressor of the present invention can suppress electrical conduction between the conductive part and the compressor container via the liquid refrigerant, and can improve the insulation between the conductive part and the compressor container.

Sectional drawing of the compressor in Embodiment 1 of this invention The expanded sectional view which shows the terminal connection part of the compressor in Embodiment 1 The expanded sectional view which shows the terminal connection part of the compressor in Embodiment 2 The expanded sectional view which shows the terminal connection part of the compressor in Embodiment 3

  1st invention is equipped with the electric motor which drives a compression mechanism part, and the inverter which controls the drive of the said electric motor, The terminal which electrically connects the said electric motor and inverter is an electric motor accommodating part of a compressor container In the electric compressor in which the cluster block located on the electric motor housing portion side is connected to the metal terminal of the terminal, the cover that covers the entire cluster block The cover is formed with a first insertion hole through which the metal terminal can be inserted and a second insertion hole through which the lead wire of the electric motor can be inserted, and an outer periphery of the first insertion hole Is provided with an insulating holding portion that covers the outer periphery of the metal terminal and secures an insulation distance between the metal terminal and the partition wall of the compressor container.

  As a result, the open part provided for the manufacture or assembly of the cluster block is covered with the cover, and the exposed part of the metal terminal of the terminal is covered with the insulating holding part, so that the exposure of the conductive part is suppressed, and further the electric The insulation distance between the motor housing portion and the inverter housing portion is increased, so that the insulation between the conductive portion and the compressor container can be improved.

  According to a second aspect of the present invention, in the first aspect, the insulating holding portion is formed of a cylindrical wall provided on the outer periphery of the first insertion hole of the cover so as to cover the outer periphery of the metal terminal. By forming the cylindrical wall, the insulation can be improved with a simple configuration.

  According to a third invention, in the second invention, the cylindrical wall covers an insulating member provided so as to extend an insulating distance between the body of the terminal and the metal terminal. Since insulation is performed twice, the insulation can be further improved.

  According to a fourth aspect of the present invention, in the first aspect, the insulating holding portion is composed of an insulating tube and an insulating member arranged so as to cover the outer periphery of the metal terminal on the outer wall surface of the cover where the first insertion hole is located. In addition, since the insulation distance can be secured with the insulating tube and the insulating member, the insulation can be further improved.

  According to a fifth aspect of the present invention, in the first aspect, the insulating holding portion is provided so that the insulating tube fitted in the first insertion hole of the cover and the insulating tube are overlapped to cover the outer periphery of the metal terminal Since the insulation distance is secured with two of the insulating tube and the insulating member, the insulation can be further improved, and the insulating tube can be assembled with the cover already attached to the cover. As a result, work efficiency can be improved and costs can be reduced.

  According to a sixth aspect of the present invention, in the first to fifth aspects, the cover is divided into two parts, and the second insertion hole is formed by combining the covers, and the lead wire on the electric motor side is formed. There is no need to bother through the insertion hole, the mounting to the cluster block is simple, the number of work steps can be reduced, and the cost can be reduced.

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 electric compressor according to the first, second, and third embodiments of the present invention, and an example of a horizontal electric compressor that is installed sideways by a mounting leg 2 around a trunk portion. Is shown.

  The electric compressor 1 has a compression mechanism section 4 and an electric motor 5 for driving the compression mechanism section 4 in the main container 3, and the compression mechanism section side opening section 3a and the electric motor side opening section 3b of the main container 3 are respectively opened. The suction sub-container 6 and the discharge sub-container 7 are mounted so as to face each other, and the main container 3, the suction sub-container 6 and the discharge sub-container 7 form a hermetic compressor container. An inverter 8 that drives the electric motor 5 is built in the suction sub-container 6, and an oil supply device 9 that supplies liquid for lubrication of each sliding part including the compression mechanism part 4 is provided in the electric motor side opening 3 b. I have.

  The refrigerant to be handled is a gas refrigerant, and a liquid such as the lubricating oil 17 is employed as a liquid to be used for lubrication of each sliding part and a seal of the sliding part of the compression mechanism part 4. The lubricating oil 17 is compatible with the refrigerant.

  However, the present invention is not limited to these. Basically, a compression mechanism unit 4 that sucks, compresses and discharges liquid, an electric motor 5 that drives the compression mechanism unit 4, the compression mechanism unit 4, and the electric motor are housed, and the electric motor housing The electric compressor 1 provided with the compressor container which partitions off the part and the inverter accommodating part by the partition wall may be used, and the following description does not limit the description of the scope of claims.

  The compression mechanism section 4 of the electric compressor 1 according to the present embodiment is of a scroll type as an example, and a compression space 12 formed by meshing a fixed scroll 10 and a turning scroll 11 as shown in FIG. However, when the orbiting scroll 11 is orbitally moved with respect to the fixed scroll 10 by the electric motor 5 via the drive shaft 13, the suction, compression and external of the refrigerant returning from the external cycle by changing the volume accompanying the movement Discharge to the cycle is performed through a suction port 14 provided in the suction sub-container 6 and a discharge port 15 provided in the discharge sub-container 7.

  At the same time, the lubricating oil 17 stored in the liquid storage section 16 of the discharge sub-container 7 is driven by driving the gear pump 18 or the like with the drive shaft 13 or using the differential pressure in the main container 3. Along with the turning drive of the orbiting scroll 11 through the oil supply passage 19 of the shaft 13, it is supplied to the liquid reservoir 20 on the back surface of the orbiting scroll 11, and a part of the lubricating oil 17 supplied to this liquid reservoir 20 is wrapped around the outer peripheral portion of the orbiting scroll 11. Supply to the back pressure chamber 21 on the opposite side through the orbiting scroll end plate 11a to a predetermined restriction base such as a throttle 11b, and further through the communication hole 11c provided in the orbiting scroll 11 to the recess 10a provided in the fixed scroll 10 As a result, the back pressure is adjusted to a predetermined amount, and the lubricating oil 17 is supplied between the fixed scroll 10 and the orbiting scroll 11 while the orbiting scroll 11 is pressed and backed up. , Achieve sealing and lubrication between the fixed scroll 10 orbiting scroll 11. Further, another part of the lubricating oil 17 supplied to the liquid reservoir 20 is lubricated while passing through the eccentric bearing 24 and the main bearing 22, then flows out to the electric motor 5 side, and is collected to the liquid storage unit 16. The

Further, a main bearing member 25 having an oil supply device 9, a sub bearing 23, an electric motor 5, and a main bearing 22 is arranged from the end wall 3c side of the electric motor side opening 3b in the main container 3. The oil supply device 9 accommodates the gear pump 18 from the outer surface of the end wall 3c and holds the gear pump 18 with a pump plate 26 attached by bolts (not shown) thereafter, and the liquid storage unit 16 is provided inside the discharge sub-container 7. An oil reservoir chamber 27 is formed so as to communicate with the liquid storage section 16 through an oil suction passage 28. The auxiliary bearing 23 is supported by the end wall 3c, and the side connected to the gear pump 18 of the drive shaft 13 is supported.

  The electric motor 5 fixes the stator 5 a to the inner periphery of the main container 3 by bolts or shrink fitting, and the drive shaft 13 can be rotationally driven by the rotor 5 b fixed around the drive shaft 13. . The main bearing member 25 is inserted or press-fitted into the main container 3, and the compression mechanism portion 4 side of the drive shaft 13 is supported by the main bearing 22. The fixed scroll 10 is attached to the outer surface of the main bearing member 25 with a bolt or the like (not shown), and the orbiting scroll 11 is sandwiched between the main bearing member 25 and the fixed scroll 10 to constitute a scroll compressor. An Oldham ring 29 is provided between the main bearing member 25 and the orbiting scroll 11 to prevent the orbiting scroll 11 from rotating and to orbit.

  An eccentric shaft 13a is integrally formed on the end surface of the drive shaft 13, and a bush 30 is fitted and supported on the eccentric shaft 13a. The orbiting scroll 11 is supported on the bush 30 via an eccentric bearing 24 so as to be capable of orbiting movement so as to face the fixed scroll 10. A cylindrical portion 11d protrudes from the rear surface of the orbiting scroll end plate 11a of the orbiting scroll 11, and the eccentric bearing 24 is accommodated in the cylindrical portion 11d. The inner ring of the eccentric bearing 24 is fitted to the bush 30 and the outer ring of the eccentric bearing 24 is fitted to the cylindrical portion 11d.

  The compression mechanism unit 4 is covered with a suction sub-container 6 which is fixed to a main container 3 and openings by a bolt (not shown). The compression mechanism unit 4 is located between the suction port 14 of the suction sub-container 6 and the discharge port 15 of the discharge sub-container 7, and its own suction hole (not shown) is connected to the suction port 14 of the suction sub-container 6 through the suction passage. A discharge hole (not shown) opens into the discharge chamber via a reed valve. The discharge chamber communicates with the electric motor 5 between the compression mechanism 4 and the end wall 3c through the fixed scroll 10 and the main bearing member 25 or a communication passage formed between them and the main container 3.

  The lead wire 5c of the electric motor 5 is drawn out to the side of the suction sub container 6 through the fixed scroll 10 and the main bearing member 25 or a communication passage 31 formed between them and the main container 3, and is connected to the end of the lead wire 5c. The block 50 is connected to the metal terminal 41 of the terminal 40 penetrating through the partition wall 6 a formed by the suction sub-container 6. Further, the terminal 40 is connected to the inverter 8 in the suction sub container 6.

  The electric motor 5 is driven by the inverter 8 to rotate the compression mechanism 4 via the drive shaft 13 and to drive the gear pump 18. At this time, the compression mechanism section 4 is supplied with the lubricating oil 17 of the liquid storage section 16 by the gear pump 18 and is provided with the suction port 14 of the suction sub-container 6 and the fixed scroll 10 while receiving the lubrication, sealing and pressing action. The return refrigerant from the refrigeration cycle is sucked through a suction hole (not shown), compressed, and discharged from the discharge hole (not shown) to the discharge chamber. At this time, the inverter 8 is cooled by the return refrigerant. Further, the refrigerant discharged into the discharge chamber enters the electric motor 5 through a communication passage (not shown), and discharges while cooling the electric motor 5 and further separating the lubricating oil 17 by performing gas-liquid separation such as collision and throttling. It is discharged from the discharge port 15 of the sub container 7.

  Here, in this embodiment, as shown in FIG. 2 in which the terminal connection portion of FIG. 1 is enlarged, the entire cluster block 50 is covered with a cover 60 to improve the insulation. The cover 60 is formed with a first insertion hole 61 through which the metal terminal 41 of the terminal 40 can be inserted and a second insertion hole 62 through which the lead wire 5c of the electric motor 5 can be inserted. An insulating holding portion that covers the outer periphery of the metal terminal 41, in this embodiment, a cylindrical wall 63 is integrally formed on the outer periphery of the metal terminal 41.

  About the electric compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the electric compressor 1 stops operation, the gas refrigerant remaining in the compressor containers 3, 6, and 7 stagnates, and the liquefied refrigerant accumulates in the compressor container. The connection terminal 51 in the block 50 may be immersed.

  However, in this electric compressor 1, since the entire housing 52 of the cluster block 50 is covered with the cover 60, the first opening 53 and the second opening 54 provided in the housing 52 in terms of manufacturing or assembly are closed. As a result, the insulation distance from the partition wall 6a of the compressor container can be extended, and the insulation can be enhanced. Furthermore, since the exposed part of the metal terminal 41 of the terminal 40 is covered with the cylindrical wall 63, the exposure of the conductive part can be suppressed and the insulation can be improved.

  In the present embodiment, the cylindrical wall 63 is formed so as to cover the insulating member 43 that extends the insulating distance between the body 42 of the terminal 40 and the metal terminal 41, so that the partition wall 6a of the compressor container The insulation distance can be further extended, and the insulation can be further enhanced.

  Further, in the present embodiment, the cover 60 is divided into two parts, and the second insertion hole 62 can be formed by combining the respective covers, so that the lead wire 5c of the electric motor 5 is inserted through both ways. It is not necessary to pass through the holes, and the mounting to the cluster block 50 is simple, the number of work steps can be reduced, and the cost can be reduced.

  In addition, since the hole diameter can be reduced in accordance with the wire diameter of the lead wire 5c, the leakage current path can be reduced and the insulation resistance can be improved.

(Embodiment 2)
FIG. 3 shows a terminal connection portion according to the second embodiment. In this embodiment, the insulation provided on the metal terminal 41 so as to face the outer wall surface of the cover where the first insertion hole 61 of the cover 60 is located and the outer wall surface. An insulating tube 70 is disposed between the member 43 and an insulating holding portion to constitute an insulating holding portion so as to insulate and hold the partition wall 6a of the compressor container and the body 42 of the terminal 40 attached thereto. It is. Other configurations are the same as those of the first embodiment, and the same parts are denoted by the same reference numerals and the description thereof is omitted.

  Since the electric compressor 1 configured in this manner covers the entire housing 52 of the cluster block 50 with the cover 60 as in the first embodiment, the first opening for manufacturing or assembly provided in the housing 52 is provided. The portion 53 and the second opening 54 are closed, and the cover 60 itself has only the minimum first insertion hole 61 and the second insertion hole 62 necessary for connection. Insulating distance can be extended and the insulation distance with 42 and the partition wall 6a can be extended. Furthermore, since the exposed portion of the metal terminal 41 of the terminal 40 is covered with the insulating tube 70, the exposure of the conductive portion can be more reliably suppressed, and the insulation can be further improved.

  Here, an elastic member such as hydrogenated nitrile rubber or fluorine rubber is used for the insulating tube 70, and both ends are brought into close contact with the outer wall surface of the insulating member 43 and the cover 60, thereby preventing the metal terminal 41 from being exposed. You may do it.

(Embodiment 3)
FIG. 4 shows a terminal connection portion according to the third embodiment of the present invention. In this embodiment, the insulating tube 70 shown in the second embodiment is fitted into the first insertion hole 61 of the cover 60 and integrated. It has become.

  With the configuration as described above, the insulating tube 70 can be arranged in the cover 60 in advance and the cluster block 50 can be assembled. Therefore, the insulating tube 70 and the cover 60 can be assembled in the manufacturing process of the electric motor 5 or in the subline. Assembly work is possible, work efficiency is improved, and costs can be reduced.

  As described above, the electric compressor according to the present invention can improve the insulation of the electrical connection portion in the atmosphere of a fine conductor such as a liquefied refrigerant. Applicable to fluid machinery such as pumps.

3 Main container (compressor container)
4 Compression Mechanism 5 Electric Motor 5c Lead Wire 6 Suction Subcontainer (Compressor Container)
6a Partition wall 7 Sub-discharge container (compressor container)
DESCRIPTION OF SYMBOLS 8 Inverter 9 Oil supply apparatus 10 Fixed scroll 11 Orbiting scroll 13 Drive shaft 14 Inlet 15 Outlet 18 Gear pump 40 Terminal 41 Metal terminal 42 Body 43 Insulating member (insulating holding part)
50 Cluster Block 51 Connection Terminal 52 Housing 53 First Opening 54 Second Opening 60 Cover 61 First Insertion Hole 62 Second Insertion Hole 63 Cylindrical Wall (Insulation Holding Part)
70 Insulating tube (insulation holding part)

Claims (3)

An electric motor that drives the compression mechanism, and an inverter that controls driving of the electric motor, and a terminal that electrically connects the electric motor and the inverter is connected to the electric motor housing portion and the inverter housing portion of the compressor container. In an electric compressor that is inserted into a partition wall that divides the space, and a cluster block located on the electric motor housing portion side is connected to a metal terminal of the terminal, a cover that covers the entire cluster block is provided, and the cover Forming a first insertion hole through which the metal terminal can be inserted and a second insertion hole through which the lead wire of the electric motor can be inserted, and the metal terminal on the outer periphery of the first insertion hole An insulating holding part that covers the outer periphery of the metal terminal and secures an insulating distance between the metal terminal and the partition wall of the compressor container ;
The insulating holding portion is configured by a cylindrical wall provided on the outer periphery of the first insertion hole of the cover so as to cover the outer periphery of the metal terminal, and the cylindrical wall extends an insulating distance between the body of the terminal and the metal terminal. An electric compressor configured to cover the insulating member provided as described above . An electric motor that drives the compression mechanism, and an inverter that controls driving of the electric motor, and a terminal that electrically connects the electric motor and the inverter is connected to the electric motor housing portion and the inverter housing portion of the compressor container. In an electric compressor that is inserted into a partition wall that divides the space, and a cluster block located on the electric motor housing portion side is connected to a metal terminal of the terminal, a cover that covers the entire cluster block is provided, and the cover Forming a first insertion hole through which the metal terminal can be inserted and a second insertion hole through which the lead wire of the electric motor can be inserted, and the metal terminal on the outer periphery of the first insertion hole An insulating holding part that covers the outer periphery of the metal terminal and secures an insulating distance between the metal terminal and the partition wall of the compressor container;
The insulating holding part is an electric compressor constituted by an insulating tube fitted in a first insertion hole of a cover and an insulating member provided to overlap the insulating tube so as to cover the outer periphery of the metal terminal. The electric compressor according to claim 1 or 2, wherein the cover is divided into two parts, and the second insertion hole is formed by combining the covers.