JP2023106003A - Scroll type electric compressor - Google Patents

Abstract

To reduce noise caused by vibrations that a scroll type electric compressor generates while making the scroll type electric compressor compact.SOLUTION: A fixed scroll 25 is fixed to a bearing housing 13 by respective fixing bolts 51 penetrating a flange part 19 to be threadedly engaged with the fixed scroll 25. The fixed scroll 25 therefore hardly vibrates. First intake ports 37, through bolts 52, and the fixing bolts 51 are arranged at the flange part 19, side by side, in a circumferential direction of a rotary shaft 15. Consequently, there is no need to shift the arrangement positions of the respective first intake ports 37 and the respective through bolts 52, for example, from the existent positions outward in radial directions of the rotary shaft 15 so as to secure arrangement spaces for the respective fixing bolts 51.SELECTED DRAWING: Figure 1

Description

The present invention relates to a scroll electric compressor.

For example, as disclosed in Patent Literature 1, a scroll electric compressor includes a rotating shaft and an electric motor. The electric motor rotates the rotating shaft. A scroll electric compressor includes an orbiting scroll and a fixed scroll. The orbiting scroll revolves along with the rotation of the rotating shaft. The fixed scroll defines a compression chamber together with the orbiting scroll.

A scroll electric compressor includes a shaft support housing, a motor housing, and a discharge housing. The shaft support housing rotatably supports the rotating shaft. The motor housing defines a motor chamber together with the journal housing. The motor chamber receives fluid from the outside while housing the electric motor. A discharge housing accommodates a fixed scroll. The discharge housing defines a discharge chamber together with the fixed scroll. The fluid compressed in the compression chamber is discharged into the discharge chamber. For example, as disclosed in Patent Document 1, the discharge housing, the shaft support housing, and the motor housing are integrally fastened with through bolts.

JP 2019-178676 A

By the way, in such a scroll type electric compressor, it is desired to reduce noise associated with vibration generated from the scroll type electric compressor. Further, in the scroll type electric compressor, it is also desired to reduce the size of the scroll type electric compressor.

A scroll-type electric compressor that solves the above problems includes a rotating shaft, an electric motor that rotates the rotating shaft, an orbiting scroll that revolves as the rotating shaft rotates, and a fixed scroll that defines a compression chamber together with the orbiting scroll. a shaft housing that rotatably supports the rotating shaft; a motor housing that houses the electric motor and defines a motor chamber into which fluid is sucked from the outside together with the shaft housing; a discharge housing defining, together with the fixed scroll, a discharge chamber into which the fluid compressed in the compression chamber is discharged, wherein the motor housing, the shaft support housing, and the discharge housing are integrally fastened by through bolts. In the scroll type electric compressor, the axial support housing has an annular flange portion through which the through-bolt penetrates and is sandwiched between the motor housing and the discharge housing, and the flange portion includes: A suction port is formed to guide the fluid in the motor chamber to the compression chamber, and the fixed scroll is fixed to the shaft support housing by a fixing bolt that passes through the flange portion and is screwed into the fixed scroll. The suction port, the through bolt, and the fixing bolt are arranged side by side in the circumferential direction of the rotating shaft at the flange portion.

According to this, the fixed scroll is fixed to the shaft support housing by a fixing bolt that passes through the flange portion and is screwed onto the fixed scroll. Therefore, it becomes difficult for the fixed scroll to vibrate. Therefore, it is possible to reduce noise caused by vibrations generated from the scroll type electric compressor.

Also, the intake port, the through bolt, and the fixing bolt are arranged side by side in the circumferential direction of the rotating shaft in the flange portion. Therefore, it is not necessary to change the design, for example, to shift the position of the intake port or the through bolt from the existing position to the outside in the radial direction of the rotating shaft in order to secure the space for arranging the fixing bolt. As a result, it is possible to reduce the noise associated with the vibration generated from the scroll type electric compressor while achieving the downsizing of the scroll type electric compressor.

In the above scroll type electric compressor, the motor housing and the discharge housing preferably have mounting legs to be mounted on a mounting target, and the shaft support housing does not have the mounting legs.

According to this, the fixed scroll is not fixed to the motor housing and the discharge housing having the mounting legs, but is fixed to the shaft support housing which does not have the mounting legs. It is difficult to transmit to the mounting object via the legs. Therefore, it is possible to reduce the vibration transmitted from the scroll type electric compressor to the mounting object.

In the scroll electric compressor, the fixing bolt may be positioned between the mounting leg and the rotating shaft in the radial direction of the rotating shaft when viewed from the axial direction of the rotating shaft.
According to this, the fixing bolt is arranged on the vibration transmission path through which the vibration generated from the rotating shaft reaches the mounting leg. Since the portion where the fixed scroll and the shaft support housing are fixed by the fixing bolt has high rigidity, it is difficult for vibration from the rotating shaft to be transmitted to the mounting leg. Therefore, it is possible to further facilitate reduction of vibration transmitted from the scroll type electric compressor to the mounting object.

According to the present invention, it is possible to reduce the noise associated with the vibration generated from the scroll type electric compressor while reducing the size of the scroll type electric compressor.

1 is a cross-sectional view of a scroll electric compressor according to an embodiment; FIG. It is a sectional view of a scroll type electric compressor. FIG. 3 is a cross-sectional view showing an enlarged part of the scroll electric compressor. FIG. 4 is a cross-sectional view showing an assembly in which a fixed scroll, an orbiting scroll, a journal housing, and a rotating shaft are integrated;

An embodiment embodying a scroll type electric compressor will be described below with reference to FIGS. 1 to 4. FIG. The scroll type electric compressor of this embodiment is used, for example, in a vehicle air conditioner.
(Overall Configuration of Scroll-type Electric Compressor 10)
As shown in FIG. 1 , the scroll electric compressor 10 has a tubular housing 11 . The housing 11 has a motor housing 12 , a shaft housing 13 and a discharge housing 14 . Accordingly, the scroll electric compressor 10 includes a motor housing 12 , a shaft support housing 13 and a discharge housing 14 . The motor housing 12, the journal housing 13, and the discharge housing 14 are made of metal material, for example, aluminum. The scroll electric compressor 10 also includes a rotating shaft 15 . The rotating shaft 15 is accommodated within the housing 11 .

(Regarding the motor housing 12)
The motor housing 12 has a plate-like end wall 12a and a cylindrical peripheral wall 12b. The peripheral wall 12b extends cylindrically from the outer peripheral portion of the end wall 12a. The axial direction of the peripheral wall 12 b coincides with the axial direction of the rotating shaft 15 . A plurality of female screw holes 12c are formed in the open end of the peripheral wall 12b. The plurality of female screw holes 12c are arranged side by side at predetermined intervals in the circumferential direction of the peripheral wall 12b. In addition, in FIG. 1, only one female screw hole 12c is illustrated for convenience of explanation. The motor housing 12 also has an intake port 12h for sucking refrigerant gas as a fluid from the outside. The suction port 12h is formed in a portion of the peripheral wall 12b located on the end wall 12a side. The suction port 12h communicates the inside and outside of the motor housing 12 with each other.

A cylindrical boss portion 12d protrudes from the inner surface of the end wall 12a. A first end, which is one end in the axial direction of the rotating shaft 15, is inserted into the boss portion 12d. A rolling bearing 16 is provided between the inner peripheral surface of the boss portion 12 d and the outer peripheral surface of the first end of the rotating shaft 15 . A first end of the rotary shaft 15 is rotatably supported by the motor housing 12 via a rolling bearing 16 .

(Regarding the shaft support housing 13)
The pivot housing 13 has a plate-like end wall 17 and a cylindrical peripheral wall 18 . The peripheral wall 18 extends cylindrically from the outer peripheral portion of the end wall 17 . The axial direction of the peripheral wall 18 coincides with the axial direction of the rotating shaft 15 . The shaft support housing 13 also has an annular flange portion 19 . The flange portion 19 extends radially outward of the rotating shaft 15 from the end portion of the outer peripheral surface of the peripheral wall 18 opposite to the end wall 17 . The outer peripheral portion of the flange portion 19 faces the open end of the peripheral wall 12 b of the motor housing 12 in the axial direction of the rotating shaft 15 .

As shown in FIG. 2, a plurality of bolt insertion holes 19a are formed in the outer peripheral portion of the flange portion 19. As shown in FIG. The plurality of bolt insertion holes 19a are arranged side by side at predetermined intervals in the circumferential direction of the rotating shaft 15 . Each bolt insertion hole 19a penetrates the flange portion 19 in the thickness direction. As shown in FIG. 1, each bolt insertion hole 19a of the flange portion 19 communicates with each female screw hole 12c of the motor housing 12, respectively.

A motor chamber 20 is formed in the housing 11 . The motor housing 12 and the shaft support housing 13 define a motor chamber 20 . Therefore, the motor housing 12 partitions the motor chamber 20 together with the shaft housing 13 . Refrigerant gas is sucked into the motor chamber 20 from the suction port 12h.

A circular insertion hole 17 a is formed in the central portion of the end wall 17 . The insertion hole 17a penetrates the end wall 17 in the thickness direction. The rotary shaft 15 is inserted through the insertion hole 17a. An end surface 15 e located on the second end side, which is the other end in the axial direction of the rotating shaft 15 , is located inside the peripheral wall 18 . A rolling bearing 21 is provided between the inner peripheral surface of the peripheral wall 18 and the outer peripheral surface of the rotating shaft 15 . The rotating shaft 15 is rotatably supported by the shaft support housing 13 via a rolling bearing 21 . Therefore, the shaft support housing 13 rotatably supports the rotating shaft 15 . The rotating shaft 15 is rotatably supported by the housing 11 .

(Regarding electric motor 22)
The scroll electric compressor 10 has an electric motor 22 . The electric motor 22 is housed within the motor chamber 20 . Accordingly, the motor chamber 20 accommodates the electric motor 22 . The motor housing 12 accommodates the electric motor 22 and, together with the shaft support housing 13 , defines a motor chamber 20 into which refrigerant gas is sucked from the outside. The electric motor 22 includes a tubular stator 23 and a tubular rotor 24 . The rotor 24 is arranged inside the stator 23 . The rotor 24 rotates integrally with the rotating shaft 15 . Stator 23 surrounds rotor 24 . The rotor 24 has a rotor core 24a fixed to the rotating shaft 15 and a plurality of permanent magnets (not shown) provided on the rotor core 24a. The stator 23 has a cylindrical stator core 23a and a motor coil 23b. The stator core 23 a is fixed to the inner peripheral surface of the peripheral wall 12 b of the motor housing 12 . The motor coil 23b is wound around the stator core 23a.

(About drive circuit 45)
The scroll electric compressor 10 has a drive circuit 45 . The drive circuit 45 is housed inside the inverter cover 46 . The inverter cover 46 is attached to the end wall 12 a of the motor housing 12 . The drive circuit 45 is attached to the end wall 12a so as to be cooled by the refrigerant gas in the motor chamber 20. As shown in FIG. The drive circuit 45 may be attached to the peripheral wall 12b so as to be cooled similarly. Electric power controlled by the drive circuit 45 is supplied to the motor coil 23 b to rotate the rotor 24 , and the rotating shaft 15 rotates together with the rotor 24 . Therefore, the electric motor 22 rotates the rotating shaft 15 .

(Regarding the discharge housing 14)
The discharge housing 14 has a plate-like end wall 14a and a cylindrical peripheral wall 14b. The peripheral wall 14b extends cylindrically from the outer peripheral portion of the end wall 14a. The axial direction of the peripheral wall 14 b coincides with the axial direction of the rotating shaft 15 . The open end of the peripheral wall 14 b faces the outer peripheral portion of the flange portion 19 in the axial direction of the rotating shaft 15 . Bolt insertion holes 14c communicating with the bolt insertion holes 19a of the flange portion 19 are formed in the peripheral wall 14b.

(Regarding the first mounting leg 12f and the second mounting leg 14f)
The scroll type electric compressor 10 includes a first mounting leg 12f as a mounting leg. The two first mounting legs 12f protrude from the outer peripheral surface of the peripheral wall 12b of the motor housing 12. As shown in FIG. Each first mounting leg 12f is cylindrical. The scroll type electric compressor 10 includes a second mounting leg 14f as a mounting leg. Two second mounting legs 14 f are projected from the outer peripheral surface of the peripheral wall 14 b of the discharge housing 14 . Each second mounting leg 14f is cylindrical.

The scroll-type electric compressor 10 is attached to the vehicle body 60 by screwing bolts (not shown) passing through the insides of the first attachment legs 12f and the second attachment legs 14f to the vehicle body 60 to which the scroll type electric compressor 10 is attached. ing. Therefore, the motor housing 12 and the discharge housing 14 have mounting legs to be mounted on the mounting target, and the pivot housing 13 does not have mounting legs.

(Regarding fixed scroll 25 and orbiting scroll 26)
The scroll electric compressor 10 includes a compression mechanism C1. The compression mechanism C<b>1 has a fixed scroll 25 and an orbiting scroll 26 . Therefore, the scroll electric compressor 10 includes the orbiting scroll 26 and the fixed scroll 25 . The orbiting scroll 26 revolves around the fixed scroll 25 as the rotating shaft 15 rotates. The fixed scroll 25 and the orbiting scroll 26 are arranged inside the peripheral wall 14 b of the discharge housing 14 . Therefore, the peripheral wall 14 b of the discharge housing 14 surrounds the fixed scroll 25 . The discharge housing 14 also accommodates a fixed scroll 25 . The fixed scroll 25 is positioned closer to the end wall 14 a of the discharge housing 14 than the orbiting scroll 26 in the axial direction of the rotating shaft 15 .

The fixed scroll 25 has a fixed base plate 25a, a fixed spiral wall 25b, and a fixed outer peripheral wall 25c. The fixed substrate 25a is disc-shaped. A discharge port 25h is formed in the center of the fixed substrate 25a. The discharge port 25h is circular. The discharge port 25h passes through the fixed substrate 25a in the thickness direction. The fixed spiral wall 25b rises from the fixed base plate 25a toward the side opposite to the end wall 14a. The fixed outer peripheral wall 25c rises in a cylindrical shape from the outer peripheral portion of the fixed substrate 25a. The fixed outer peripheral wall 25c surrounds the fixed spiral wall 25b. The open end face of the fixed outer peripheral wall 25c is located on the side opposite to the fixed substrate 25a with respect to the tip end face of the fixed spiral wall 25b.

A plurality of fixing bolt female screw holes 25e are formed in the open end face of the fixed outer peripheral wall 25c. The plurality of fixing bolt female screw holes 25e are arranged side by side at predetermined intervals in the circumferential direction of the rotating shaft 15 . Note that FIG. 1 shows only one fixing bolt female screw hole 25e for convenience of explanation.

The orbiting scroll 26 has an orbiting base plate 26a and an orbiting spiral wall 26b. The turning base plate 26a is disk-shaped. The swivel board 26a faces the fixed board 25a. The swirling spiral wall 26b rises from the swirling base plate 26a toward the fixed base plate 25a. The swirling spiral wall 26b meshes with the fixed spiral wall 25b. The swirling spiral wall 26b is positioned inside the fixed outer peripheral wall 25c. The turning spiral wall 26b revolves inside the fixed outer peripheral wall 25c. The tip surface of the fixed spiral wall 25b is in contact with the swirl base plate 26a, and the tip surface of the swirl spiral wall 26b is in contact with the fixed base plate 25a. A compression chamber 27 for compressing the refrigerant gas is defined by the fixed base plate 25a, the fixed spiral wall 25b, the swirling base plate 26a, and the swirling spiral wall 26b. Therefore, the fixed scroll 25 partitions the compression chamber 27 together with the orbiting scroll 26 .

The turning base plate 26a has a cylindrical boss portion 26c. The boss portion 26c protrudes from an end face 26e of the turning board 26a on the side opposite to the fixed board 25a. The axial direction of the boss portion 26 c coincides with the axial direction of the rotating shaft 15 . Further, the turning board 26a has a plurality of grooves 26d. A plurality of grooves 26d are formed around the bosses 26c on the end surface 26e of the turning base plate 26a. The plurality of grooves 26 d are arranged at predetermined intervals in the circumferential direction of the rotating shaft 15 . An annular ring member 28 is fitted in each groove 26d. A pin 29 is inserted into each ring member 28 . Each pin 29 protrudes from an end face 13e of the shaft support housing 13 on the discharge housing 14 side.

The scroll electric compressor 10 includes a valve mechanism 25v. The valve mechanism 25v is attached to the surface of the fixed substrate 25a opposite to the orbiting scroll 26. As shown in FIG. The valve mechanism 25v is configured to open and close the discharge port 25h.

The scroll electric compressor 10 has an elastic plate 30 . The elastic plate 30 is annular. The elastic plate 30 is sandwiched between the end face 13e of the shaft support housing 13 and the open end face of the fixed outer peripheral wall 25c. The elastic plate 30 always presses the orbiting scroll 26 toward the fixed scroll 25 .

A plurality of positioning recesses 25d are formed in the open end face of the fixed outer peripheral wall 25c. An end surface 13e of the shaft support housing 13 is provided with a positioning pin 13f that is inserted into each positioning recess 25d. Each positioning pin 13f penetrates the elastic plate 30 and is inserted into each positioning recess 25d. The fixed scroll 25 is restricted from rotating about the axis L1 of the rotary shaft 15 inside the peripheral wall 14b of the discharge housing 14 by inserting the positioning pins 13f into the positioning recesses 25d. , are positioned with respect to the pivot housing 13 .

(Regarding the eccentric shaft 31)
The scroll electric compressor 10 has an eccentric shaft 31 . The eccentric shaft 31 protrudes toward the orbiting scroll 26 from a position eccentric with respect to the axis L1 of the rotating shaft 15 on the end surface 15 e of the rotating shaft 15 . The eccentric shaft 31 is integrally formed with the rotary shaft 15 . The axial direction of the eccentric shaft 31 coincides with the axial direction of the rotating shaft 15 . The eccentric shaft 31 is inserted into the boss portion 26c.

(Regarding balance weight 32 and bush 33)
The scroll electric compressor 10 includes a balance weight 32 and bushes 33 . The bush 33 is fitted on the outer peripheral surface of the eccentric shaft 31 . The balance weight 32 is integrated with the bush 33 . The balance weight 32 is integrally formed with the bush 33 . The balance weight 32 is housed within the peripheral wall 18 of the pivot housing 13 . The orbiting scroll 26 is supported by the eccentric shaft 31 via a bush 33 and a rolling bearing 34 so as to be rotatable relative to the eccentric shaft 31 .

Rotation of the rotating shaft 15 is transmitted to the orbiting scroll 26 via the eccentric shaft 31, the bush 33, and the rolling bearing 34, and the orbiting scroll 26 rotates. The contact between each pin 29 and the inner peripheral surface of each ring member 28 prevents rotation of the orbiting scroll 26 and allows only orbital motion of the orbiting scroll 26 . As a result, the orbiting scroll 26 revolves while the orbiting spiral wall 26b is in contact with the fixed spiral wall 25b, and the volume of the compression chamber 27 is reduced, thereby compressing the refrigerant gas. The orbiting scroll 26 revolves inside the fixed outer peripheral wall 25c as the rotating shaft 15 rotates. The balance weight 32 reduces the unbalance amount of the orbiting scroll 26 by canceling the centrifugal force acting on the orbiting scroll 26 when the orbiting scroll 26 revolves.

(Regarding suction passage 35)
The scroll electric compressor 10 has an intake passage 35 . The intake passage 35 is formed by a first groove 36 , a first intake port 37 , a second groove 38 and a second intake port 39 . A plurality of first grooves 36 are formed in a part of the inner peripheral surface of the peripheral wall 12 b of the motor housing 12 . Each first groove 36 opens at the open end of the peripheral wall 12b.

As shown in FIG. 2 , a plurality of first intake ports 37 are formed on the outer peripheral portion of the flange portion 19 of the pivot housing 13 . Each first suction port 37 is a hole that curves and extends in an arc shape in the circumferential direction of the rotating shaft 15 . The plurality of first suction ports 37 are arranged side by side at predetermined intervals in the circumferential direction of the rotating shaft 15 . Each first intake port 37 is arranged side by side with each bolt insertion hole 19 a in the circumferential direction of the rotating shaft 15 . As shown in FIG. 1 , each first intake port 37 communicates with each first groove 36 . Each first suction port 37 penetrates the flange portion 19 in the thickness direction.

A plurality of second grooves 38 are formed in a part of the inner peripheral surface of the peripheral wall 14 b of the discharge housing 14 . Each second groove 38 communicates with each first suction port 37 . A plurality of second suction ports 39 are formed in the fixed outer peripheral wall 25 c of the fixed scroll 25 . Each second suction port 39 communicates with each second groove 38 . Each second suction port 39 passes through the fixed outer peripheral wall 25c in the thickness direction. In FIG. 1, for convenience of illustration, one each of the first groove 36, the first suction port 37, the second groove 38, and the second suction port 39 is illustrated.

Refrigerant gas in the motor chamber 20 passes through each first groove 36 , each first intake port 37 , each second groove 38 and each second intake port 39 and is sucked into the compression chamber 27 . A space inside each second groove 38 is a suction chamber S1. The suction chamber S<b>1 is defined by the shaft support housing 13 , the discharge housing 14 and the fixed scroll 25 . Therefore, the suction passage 35 draws the refrigerant gas in the motor chamber 20 into the compression chamber 27 . Accordingly, first suction ports 37 are formed in the flange portion 19 as suction ports for guiding the refrigerant gas in the motor chamber 20 to the compression chamber 27 . Refrigerant gas sucked into the compression chamber 27 is compressed in the compression chamber 27 by the orbital motion of the orbiting scroll 26 . It can also be said that the first suction port 37 communicates the suction chamber S<b>1 and the motor chamber 20 .

(Regarding discharge chamber 40)
The scroll electric compressor 10 has a discharge chamber 40 . The discharge chamber 40 is defined within the housing 11 . The discharge chamber 40 is defined by the end wall 14 a of the discharge housing 14 and the fixed substrate 25 a of the fixed scroll 25 . Therefore, the discharge housing 14 accommodates the fixed scroll 25 and partitions the discharge chamber 40 together with the fixed scroll 25 . The discharge chamber 40 communicates with the discharge port 25h. Refrigerant gas compressed in the compression chamber 27 is discharged into the discharge chamber 40 through the discharge port 25h.

(Regarding the discharge port 14h)
The discharge housing 14 has a discharge port 14h. The discharge port 14 h discharges refrigerant gas to the outside of the discharge housing 14 . The discharge port 14 h is formed in the end wall 14 a of the discharge housing 14 . The discharge port 14h and the suction port 12h are connected via an external refrigerant circuit (not shown). Although illustration is omitted, the external refrigerant circuit has a condenser, an expansion valve, and an evaporator. The scroll type electric compressor 10 constitutes a vehicle air conditioner together with an external refrigerant circuit.

(Regarding the fixing bolt insertion hole 13h)
As shown in FIGS. 2 and 3, the pivot housing 13 has a plurality of fixing bolt insertion holes 13h. Each fixing bolt insertion hole 13 h penetrates the flange portion 19 of the shaft support housing 13 . The fixing bolt insertion holes 13h are arranged at predetermined intervals in the circumferential direction of the rotating shaft 15, respectively. The first suction ports 37, the bolt insertion holes 19a, and the fixing bolt insertion holes 13h are arranged side by side in the circumferential direction of the rotary shaft 15. As shown in FIG.

(Regarding the fixing bolt 51)
The scroll electric compressor 10 has a plurality of fixing bolts 51 . Each fixing bolt 51 passes through the flange portion 19 of the shaft support housing 13 and is screwed to the fixed scroll 25 . Specifically, each fixing bolt 51 passes through each fixing bolt insertion hole 13h and is screwed into each fixing bolt female screw hole 25e. Therefore, the fixed scroll 25 is fixed to the pivot housing 13 by a plurality of fixing bolts 51. As shown in FIG.

(Regarding the first gasket 41)
As shown in FIG. 3 , the scroll electric compressor 10 has an annular first gasket 41 . The first gasket 41 is interposed between the end wall 14 a of the discharge housing 14 and the fixed substrate 25 a of the fixed scroll 25 . The first gasket 41 is a metal thin plate. The outer peripheral portion of the first gasket 41 extends along the outer peripheral portion of the fixed substrate 25a. The first gasket 41 seals between the end wall 14 a of the discharge housing 14 and the fixed substrate 25 a of the fixed scroll 25 . The first gasket 41 prevents leakage of the refrigerant gas discharged into the discharge chamber 40 from the discharge chamber 40 .

(Regarding the second gasket 42)
The scroll electric compressor 10 includes an annular second gasket 42 . The second gasket 42 is interposed between the peripheral wall 14 b of the discharge housing 14 and the flange portion 19 of the pivot housing 13 . The second gasket 42 is a metal thin plate. The second gasket 42 seals between the peripheral wall 14 b of the discharge housing 14 and the flange portion 19 of the pivot housing 13 . The second gasket 42 has a bead portion 42a. The bead portion 42a is annular. The bead portion 42a is a portion of the second gasket 42 that curves in the thickness direction. The bead portion 42 a is elastically deformable between the peripheral wall 14 b of the discharge housing 14 and the flange portion 19 of the pivot housing 13 .

(Regarding the third gasket 43)
The scroll electric compressor 10 has an annular third gasket 43 . The third gasket 43 is interposed between the flange portion 19 of the shaft support housing 13 and the peripheral wall 12b of the motor housing 12 . The third gasket 43 is a metal thin plate. The third gasket 43 seals between the flange portion 19 of the shaft support housing 13 and the peripheral wall 12b of the motor housing 12 . The third gasket 43 has a bead portion 43a. The bead portion 43a is annular. The bead portion 43a is a portion of the third gasket 43 that curves in the thickness direction. The bead portion 43 a is elastically deformable between the flange portion 19 of the shaft support housing 13 and the peripheral wall 12 b of the motor housing 12 .

(Regarding through bolt 52)
The scroll electric compressor 10 has a plurality of through bolts 52 . Each through bolt 52 passes through each bolt insertion hole 14c, 19a and is screwed into each female screw hole 12c. Therefore, the through-bolt 52 is threaded into the motor housing 12 through the peripheral wall 14 b of the discharge housing 14 and the shaft housing 13 . The motor housing 12 , the shaft support housing 13 and the discharge housing 14 are integrally fastened by through bolts 52 . A through bolt 52 passes through the flange portion 19 , and the flange portion 19 is held between the motor housing 12 and the peripheral wall 14 b of the discharge housing 14 . The discharge housing 14 , the shaft support housing 13 , and the motor housing 12 are arranged in the axial direction of the rotating shaft 15 with the shaft support housing 13 sandwiched between the peripheral wall 14 b and the motor housing 12 by the axial force of the through bolt 52 . They are fixed together in sequence. Therefore, the motor housing 12, the shaft housing 13, and the discharge housing 14 are arranged side by side in the axial direction of the rotating shaft 15 in this order.

The fixed scroll 25 and the journal housing 13 are sandwiched between the end wall 14 a of the discharge housing 14 and the peripheral wall 12 b of the motor housing 12 . At this time, the bead portion 42a of the second gasket 42 and the bead portion 42a of the third gasket 43 are each elastically deformed, so that the dimensional tolerance between the end wall 14a of the discharge housing 14 and the peripheral wall 12b of the motor housing 12 is absorbed. It is Therefore, transmission of the axial force of the through-bolt 52 from the end wall 14a of the discharge housing 14 to the peripheral wall 12b of the motor housing 12 via the fixed scroll 25 and the shaft support housing 13 is ensured. As a result, the motor housing 12 , the shaft support housing 13 and the discharge housing 14 are firmly integrated by the axial force of the through bolts 52 .

(Positional relationship among first suction port 37, through bolt 52, and fixing bolt 51)
As shown in FIG. 2 , each first intake port 37 , each through bolt 52 , and each fixing bolt 51 are arranged side by side in the circumferential direction of the rotating shaft 15 on the flange portion 19 . A portion of each fixing bolt 51 overlaps each first intake port 37 and each through bolt 52 in the circumferential direction of the rotating shaft 15 . One of the plurality of fixing bolts 51 is positioned between the second mounting leg 14 f and the rotating shaft 15 in the radial direction of the rotating shaft 15 when viewed from the axial direction of the rotating shaft 15 .

(action)
Next, the operation of this embodiment will be described.
A fixed scroll 25 is fixed to the journal housing 13 by a fixing bolt 51 . Therefore, it becomes difficult for the fixed scroll 25 to vibrate. Therefore, noise caused by vibration generated from the scroll type electric compressor 10 is reduced. Further, the fixed scroll 25 is not fixed to the motor housing 12 having the first mounting leg 12f and the discharge housing 14 having the second mounting leg 14f, but is fixed to the shaft support housing 13 having no mounting leg. . Therefore, vibration generated from the fixed scroll 25 is less likely to be transmitted to the vehicle body 60 to which it is attached via the first mounting leg 12f and the second mounting leg 14f. Furthermore, one of the plurality of fixing bolts 51 is positioned between the second mounting leg 14 f and the rotating shaft 15 in the radial direction of the rotating shaft 15 when viewed from the axial direction of the rotating shaft 15 . . Therefore, the fixing bolt 51 is arranged on the vibration transmission path through which the vibration generated from the rotating shaft 15 reaches the second mounting leg 14f. A portion where the fixed scroll 25 and the axial support housing 13 are fixed by the fixing bolt 51 has high rigidity. Therefore, vibration from the rotating shaft 15 is less likely to be transmitted to the second mounting leg 14f.

As shown in FIG. 4, by fixing the fixed scroll 25 to the axial support housing 13 with each fixing bolt 51, an assembly in which the fixed scroll 25, the orbiting scroll 26, the axial support housing 13, and the rotating shaft 15 are integrated is assembled. is configured. As a result, it is possible to adjust the balance of the vibration caused by the rotation of the rotary shaft 15 by using the through bolts 52 before the motor housing 12, the shaft housing 13, and the discharge housing 14 are integrated. .

(effect)
The following effects can be obtained in the above embodiment.
(1) The fixed scroll 25 is fixed to the shaft support housing 13 by fixing bolts 51 that pass through the flange portion 19 and are screwed onto the fixed scroll 25 . Therefore, the fixed scroll 25 is less likely to vibrate than, for example, when the fixed scroll 25 is simply sandwiched between the discharge housing 14 and the pivot housing 13 . Therefore, noise accompanying vibration generated from the scroll type electric compressor 10 can be reduced.

Each first intake port 37 , each through bolt 52 , and each fixing bolt 51 are arranged side by side in the circumferential direction of the rotating shaft 15 on the flange portion 19 . Therefore, in order to secure the space for arranging the fixing bolts 51, it is necessary to change the design such that the arrangement positions of the first intake ports 37 and the through bolts 52 are shifted from the existing positions to the outside in the radial direction of the rotating shaft 15, for example. No need to do it. As a result, it is possible to reduce the noise associated with the vibration generated from the scroll type electric compressor 10 while reducing the size of the scroll type electric compressor 10 .

(2) The fixed scroll 25 is not fixed to the motor housing 12 having the first mounting leg 12f and the discharge housing 14 having the second mounting leg 14f, but is fixed to the shaft support housing 13 having no mounting leg. ing. Therefore, vibration generated from the fixed scroll 25 is less likely to be transmitted to the vehicle body 60 to which it is attached via the first mounting leg 12f and the second mounting leg 14f. Therefore, vibration transmitted from the scroll type electric compressor 10 to the vehicle body 60 can be reduced.

(3) One of the plurality of fixing bolts 51 is positioned between the second mounting leg 14f and the rotating shaft 15 in the radial direction of the rotating shaft 15 when viewed from the axial direction of the rotating shaft 15. there is According to this, the fixing bolt 51 is arranged on the vibration transmission path through which the vibration generated from the rotating shaft 15 reaches the second mounting leg 14f. Since the portion where the fixed scroll 25 and the axial support housing 13 are fixed by the fixing bolt 51 has high rigidity, vibration from the rotating shaft 15 is hardly transmitted to the second mounting leg 14f. Therefore, the vibration transmitted from the scroll electric compressor 10 to the vehicle body 60 can be further reduced.

(4) By fixing the fixed scroll 25 to the axial support housing 13 with each fixing bolt 51, an assembly in which the fixed scroll 25, the orbiting scroll 26, the axial support housing 13, and the rotating shaft 15 are integrated is constructed. . According to this, the through-bolts 52 allow balance adjustment of vibration accompanying the rotation of the rotary shaft 15 before the motor housing 12 , the shaft housing 13 , and the discharge housing 14 are integrated.

(Change example)
It should be noted that the above embodiment can be implemented with the following modifications. The above embodiments and the following modifications can be combined with each other within a technically consistent range.

O In the embodiment, the pivot housing 13 may have mounting legs to be mounted on the vehicle body 60 .
○ In the embodiment, each fixing bolt 51 is positioned between the first mounting leg 12f or the second mounting leg 14f and the rotating shaft 15 in the radial direction of the rotating shaft 15 when viewed from the axial direction of the rotating shaft 15. You don't have to.

(circle) in embodiment, the arrangement position of the 1st mounting leg 12f and the arrangement position of the 2nd mounting leg 14f can be changed suitably. Moreover, the number of the first mounting legs 12f and the number of the second mounting legs 14f can be changed as appropriate.

(circle) in embodiment, the number of the fixing bolts 51 can be changed suitably.
(circle) in embodiment, the scroll type electric compressor 10 was used for the vehicle air conditioner, but it is not restricted to this. For example, the scroll-type electric compressor 10 may be mounted on a fuel cell vehicle and compress air as a fluid to be supplied to the fuel cell by means of the compression mechanism C1.

(circle) in embodiment, the attachment object to which the 1st attachment leg 12f and the 2nd attachment leg 14f are attached is not restricted to the vehicle body 60. As shown in FIG. In short, the object to which the first mounting leg 12f and the second mounting leg 14f are mounted is appropriately changed, such as the engine of the vehicle, according to the application of the scroll type electric compressor 10 .

DESCRIPTION OF SYMBOLS 10... Scroll type electric compressor 12... Motor housing 12f... First mounting leg as a mounting leg 13... Pivot housing 14... Discharge housing 14f... Second mounting leg as a mounting leg 15... Rotary shaft , 19... Flange portion 20... Motor chamber 22... Electric motor 25... Fixed scroll 26... Revolving scroll 27... Compression chamber 37... First intake port as an intake port 40... Discharge chamber 51... Fixed Bolt 52...Through bolt 60...Car body to be mounted.

Claims (3)

a rotating shaft;
an electric motor that rotates the rotating shaft;
an orbiting scroll that revolves along with the rotation of the rotating shaft;
a fixed scroll defining a compression chamber together with the orbiting scroll;
a shaft support housing that rotatably supports the rotating shaft;
a motor housing that houses the electric motor and defines, together with the shaft housing, a motor chamber into which fluid is sucked from the outside;
a discharge housing that accommodates the fixed scroll and partitions a discharge chamber into which the fluid compressed in the compression chamber is discharged together with the fixed scroll;
A scroll electric compressor in which the motor housing, the shaft support housing, and the discharge housing are integrally fastened by through bolts,
The shaft support housing has an annular flange portion through which the through-bolt penetrates and which is sandwiched between the motor housing and the discharge housing,
The flange portion is formed with a suction port for guiding the fluid in the motor chamber to the compression chamber,
The fixed scroll is fixed to the shaft support housing by a fixing bolt that passes through the flange portion and is screwed into the fixed scroll,
A scroll electric compressor, wherein the suction port, the through bolt, and the fixing bolt are arranged side by side in the circumferential direction of the rotating shaft in the flange portion. 2. The scroll type electric motor according to claim 1, wherein the motor housing and the discharge housing have mounting legs to be mounted on a mounting target, and the pivot housing does not have the mounting legs. compressor. 3. The fixing bolt according to claim 2, wherein the fixing bolt is positioned between the mounting leg and the rotating shaft in the radial direction of the rotating shaft when viewed from the axial direction of the rotating shaft. Scroll type electric compressor.

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