JP2005282551A - Electric compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase a cooling efficiency by efficiently transmitting the cool heat of a refrigerant gas sucked into a housing in an electric compressor. <P>SOLUTION: A control housing 14 is formed at the upper part of the housing 11 storing a compression part 12 and an electric motor 13 by demarcating from a low-pressure chamber 28 through a partition wall 27, and a motor drive circuit 15 is installed in the control chamber 14 on the partition wall 27 so that a power substrate 15a can close a housing opening part 29. Thus, the refrigerant gas sucked into the low-pressure chamber 28 is brought into contact with the power substrate 15a through the housing opening part 29. , a refrigerant anchoring chamber 28 and a control chamber 29 are formed in the control housing 14, and an intake tube 30 is connected to one end part of the refrigerant anchoring chamber 28. A communication tube 56 communicating with a low pressure chamber 31 through the control chamber 29 is connected to the other end part. A motor drive circuit 15 drivingly controlling the electric motor 13 is stored in the control chamber 29. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric compressor, and in particular, is mounted on a vehicle and used for air conditioning control.

  In a general electric compressor, an electric motor is disposed at one end portion inside a hollow housing, and a scroll type compression mechanism is disposed at the other end portion. Are coupled to each other via a rotating shaft. That is, the electric motor is fixed by the rotor being fixed to the rotating shaft and the stator being press-fitted into the housing. The scroll compression mechanism includes a fixed scroll having a spiral wrap and a orbiting scroll having a spiral wrap, and the fixed scroll and the orbiting scroll are eccentric from each other by a predetermined distance, and 180 degrees. A plurality of compression chambers are formed by engaging the spiral wound wraps of the two while shifting the angle.

  Therefore, when the electric motor is driven, the orbiting scroll of the scroll type compression mechanism is driven through the rotating shaft, and the refrigerant gas is taken into the suction chamber in the housing, and this refrigerant gas is compressed between the spiral wraps. It is discharged after being compressed in the chamber.

  In such an electric compressor, a motor drive circuit for driving and controlling the electric motor is required, and this motor drive circuit is generally provided adjacent to the outside of the housing. In this case, the motor drive circuit is provided with a power transistor, a capacitor and the like constituting the inverter circuit on the substrate, and generates heat when energized, so that a cooling device is required.

  Conventionally, this motor drive circuit is cooled using a refrigerant gas sucked into the housing. As such a technique, for example, there is Patent Document 1 below. The electric compressor described in Patent Document 1 is provided with a casing on an upper side surface of a motor housing, an inverter circuit is accommodated in the casing, a power transistor and a capacitor are disposed in contact with the bottom surface, and flow through the motor housing. It is cooled by the suction refrigerant gas.

JP 2003-262187 A

  However, in general, the motor housing is made of an iron-based material, and the thermal conductivity is not so good. Therefore, like the conventional electric compressor described above, it is difficult to sufficiently cool the power transistor and the capacitor that generate heat in the casing through the upper wall by the refrigerant gas flowing inside the motor housing, and the cooling efficiency There is a problem that is not good.

  The present invention solves the above-mentioned problems, and provides an electric compressor that improves the cooling efficiency by efficiently transmitting the cooling heat of the refrigerant gas flowing in the housing to cool the motor drive circuit. For the purpose.

  In order to achieve the above object, an electric compressor according to a first aspect of the present invention includes a hollow housing, and a compression portion that is provided at one end of the housing and compresses refrigerant gas sucked into the housing. An electric motor provided at the other end of the housing for driving the compression unit, a control chamber provided at the other end of the housing and separated from the low pressure chamber, and a motor drive provided at the control chamber A circuit and an opening for contacting the refrigerant gas sucked into the low pressure chamber with a substrate of the motor drive circuit in the control chamber are provided.

  In the electric compressor according to the second aspect of the present invention, the opening is formed in a partition wall provided between the low pressure chamber and the control chamber, and a substrate of the motor drive circuit is formed from the control chamber side to the opening. It is characterized by being fixed to the partition wall so as to close the door.

  In an electric compressor according to a third aspect of the present invention, a seal member is interposed on a contact surface between the substrate and the partition wall, and the substrate is pressed and supported by the partition wall by an urging means.

  The electric compressor according to a fourth aspect of the invention is characterized in that the urging means is constituted by a U-shaped input terminal for supplying electric power to the motor drive circuit from the outside.

  In an electric compressor according to a fifth aspect of the present invention, the input terminal is a pair of metal bars, and is disposed in the control chamber in a reverse direction so as to face the left and right.

  In the electric compressor according to a sixth aspect of the invention, the motor drive circuit has a power board on which a power element is mounted and a control board on which a small power element is mounted, and the power board is on the low pressure chamber side in the control chamber. The control board is mounted on the wall surface of the control chamber facing the power board, and the U-shaped input terminal is elastically mounted between the power board and the control board, so that the external The power board can be supplied to the power board and the control board, and the power board can be pressed against the partition wall to close the opening.

  The electric compressor according to claim 7 is characterized in that the control chamber can be sealed by fixing a cover to the other end opening of the housing, and the control board is mounted on the inner surface of the cover. Yes.

  In an electric compressor according to an eighth aspect of the present invention, an end of the input terminal penetrates the cover and protrudes to the outside, and is fixed to a terminal block formed integrally with the cover.

  According to the electric compressor of the first aspect of the present invention, the control chamber is provided in the housing for accommodating the compression portion and the electric motor so as to be separated from the low pressure chamber, the motor drive circuit is provided in the control chamber, and the suction is sucked into the low pressure chamber. Since the opening for contacting the refrigerant gas with the substrate of the motor drive circuit is provided, the refrigerant gas sucked into the low pressure chamber comes into contact with the substrate of the motor drive circuit in the control chamber, so that the cooling heat of the refrigerant gas is generated by the motor drive circuit. The cooling efficiency can be improved by efficiently cooling the motor drive circuit.

  According to the electric compressor of the second aspect of the present invention, the opening is formed in the partition wall provided between the low pressure chamber and the control chamber so that the substrate of the motor drive circuit closes the opening from the control chamber side. Since the refrigerant gas can be easily brought into contact with the substrate of the motor drive circuit, the low-pressure chamber and the control chamber can be easily partitioned by this substrate.

  According to the electric compressor of the invention of claim 3, the sealing member is interposed on the contact surface between the substrate and the partition wall, and the substrate is pressed and supported by the partition wall by the biasing means. It is pressed against the partition wall via the seal member by the force, and the leakage of the refrigerant gas from the low pressure chamber can be reliably prevented by reliably partitioning the low pressure chamber and the control chamber.

  According to the electric compressor of the invention of claim 4, the urging means is constituted by the U-shaped input terminal for supplying electric power to the motor drive circuit from the outside, so the urging means and the input terminal are shared. Thus, it is possible to reduce the size and the cost, and it is possible to accommodate the input terminal in a narrow space by making the input terminal U-shaped and exerting the urging force.

  According to the electric compressor of the invention of claim 5, since the input terminals are a pair of metal bars and are disposed in the control chamber in opposite directions facing the left and right, the urging force of each input terminal is applied to the substrate of the motor drive circuit. The substrate can be made to act evenly in the horizontal direction, and the substrate can be stably pressed against the partition wall without a gap.

  According to the electric compressor of the invention of claim 6, the motor drive circuit is constituted by the power board on which the power element is mounted and the control board on which the small power element is mounted, and the power board is placed on the low pressure chamber side in the control room. The control board is mounted on the wall of the control chamber facing the power board, and the U-shaped input terminal is mounted between the power board and the control board, so that external power can be supplied to the power board and the power board. The power board can be supplied to the control board, and the power board is pressed and supported by the partition wall so that the opening can be closed, so that a plurality of boards constituting the motor drive circuit can be efficiently arranged in the control chamber. The power substrate can be easily pressed against the partition wall by the elastic force of the input terminal to close the opening, and the device can be simplified and miniaturized.

  According to the electric compressor of the seventh aspect of the invention, since the control chamber can be sealed by fixing the cover to the other end opening of the housing, and the control board is mounted on the inner surface of the cover, the power board, the control board, Assembling properties such as input terminals can be improved.

  According to the electric compressor of the eighth aspect of the invention, the end of the input terminal penetrates the cover and protrudes to the outside, and is fixed to the terminal block integrally formed with the cover. Therefore, the wiring to the input terminal can be easily performed and the external radiation of the input terminal can be made possible.

  Exemplary embodiments of an electric compressor according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  1 is a cross-sectional view illustrating an overall configuration of a scroll compressor to which an electric compressor according to a first embodiment of the present invention is applied, FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and FIG. It is a perspective view of the input terminal in the scroll compressor of.

  The scroll type compressor as the electric compressor of the first embodiment is mainly used for compressing the refrigerant gas of the vehicle air conditioner. As shown in FIGS. 1 and 2, the scroll compressor includes a hollow housing 11, a compression portion 12 accommodated in the housing 11, an electric motor 13 that drives the compression portion 12, The housing 11 includes a control chamber 14 that is partitioned from the compression unit 12 and the electric motor 13, and a motor drive circuit 15 that is accommodated in the control chamber 14.

  The housing 11 is arranged vertically and is formed as a substantially cylindrical sealed container that encloses the entire scroll compressor, and is configured by assembling a plurality of members (not shown). The electric motor 13 accommodated in the housing 11 is provided with a rotor 22 having a predetermined gap inside a stator 21 formed in a ring shape, and a rotating shaft 23 passes through a central portion of the rotor 22. The upper end portion of the rotating shaft 23 is rotatably supported by a bearing 24 fixed to the upper inner surface of the housing 11, and the lower end portion is rotatable by a bearing portion 26 of a frame 25 fixed to the lower inner surface of the housing 11. It is supported.

  A control chamber 14 is defined separately from the low-pressure chamber 28 in which the electric motor 13 is accommodated by integrally forming a ring-shaped partition wall 27 on the inner peripheral surface of the upper end portion of the housing 11. A housing opening 29 is formed inside the partition wall 27 to communicate the chambers 28 and 14. A suction pipe 30 communicating from the outside toward the low pressure chamber 28 is provided on the upper side wall of the housing 11. The refrigerant gas sucked into the low pressure chamber 28 of the housing 11 from the suction pipe 30 is sent downward. Thus, the electric motor 13 can be cooled.

  On the other hand, the control chamber 14 is a space having a circular shape in plan view, and a cover 31 having a disk shape with an open upper end is fixed by a fastening bolt 32, and the electric motor 13 and the like are driven and controlled inside. A motor drive circuit 15 is accommodated. The motor drive circuit 15 includes a power board 15a to which a power element having a large amount of heat generation such as a plurality of power transistors is attached and a control board 15b to which a small power element having a small amount of heat generation is attached. ing. In the control chamber 14, the power board 15a is mounted on the upper surface of the partition wall 27 on the low-pressure chamber 28 side, while the control board 15b is mounted on the wall surface facing the power board 15a, that is, the inner surface of the cover 31. Has been.

  In this case, the power board 15 a is mounted so that the lower surface thereof is in close contact with the upper surface of the partition wall 27, thereby closing the housing opening 30, and the power board 15 a has an outer peripheral portion on the inner peripheral surface of the control chamber 14. It is a magnitude | size which fits, and positioning is made by the horizontal direction of the power board 15a by this. Further, an O-ring 33 as a seal member is interposed between the power board 15a and the partition wall 27, and the housing opening 30 is reliably closed by the close contact between the both without gaps.

  Therefore, a part of the back surface of the power board 15a is exposed to the low pressure chamber 28 through the housing opening 30, and the refrigerant gas sucked into the low pressure chamber 28 from the suction pipe 30 comes into contact with the power board 15a. The power board 15a can be directly cooled.

  Further, in the control chamber 14, a pair of input terminals 34 and 35 are disposed on the left and right sides and in opposite directions, located between the power board 15a and the control board 15b. The input terminals 34 and 35 are made of copper, and as shown in detail in FIG. 3, the laterally U-shaped pressing portions 34a and 35a, and the end portions of the pressing portions 34a and 35a are bent upward. It consists of parts 34b and 35b. In the control chamber 14, the input terminals 34 and 35 are mechanically and electrically connected to the lower surfaces of the pressing portions 34a and 35a in contact with the power substrate 15a, and the upper surfaces of the pressing portions 34a and 35a are connected to the control substrate 15b. They are in contact with each other and are mechanically and electrically connected, and the connecting portions 34 b and 35 b penetrate the cover 31 and protrude to the outside, and are fixed to terminal blocks 31 a and 31 b formed integrally with the cover 31.

  A battery (not shown) is connected to the connection portions 34b and 35b of the input terminals 34 and 35. Further, one end of the output terminal 36 is connected to the power board 15 a, and the other end is extended to the low pressure chamber 28 and connected to the electric motor 13 via the connection line 37. In this case, since the input terminal 36 is made of copper (or aluminum) having a high thermal conductivity, the cooling heat of the power board 15a can be transmitted to the control board 15b to be cooled. Further, a capacitor 38 may be mounted between the power board 15a and the control board 15b.

  Accordingly, since the U-shaped input terminals 34 and 35 are arranged with elastic force between the power board 15a and the control board 15b in the control chamber 14, this elastic force acts on the power board 15a. The power board 15a is in close contact with the O-ring 33 without any gap, and the housing opening 30 is reliably closed, so that leakage of the refrigerant gas from the low pressure chamber 28 to the control chamber 14 is reliably prevented. Therefore, the refrigerant gas sucked into the low pressure chamber 28 from the suction pipe 30 can be cooled by directly contacting the back surface of the power board 15a exposed to the low pressure chamber 28 side.

  On the other hand, the compression unit 12 accommodated in the lower part of the housing 11 is a scroll type compression mechanism that compresses the refrigerant gas absorbed in the low pressure chamber 28, and includes a fixed scroll 39 and a turning scroll 40. Has been. The fixed scroll 39 is fitted to the inner peripheral surface of the housing 11 and fixed by a fastening bolt, and includes a disk-shaped disk 39a and a spiral wrap 39b formed on one surface of the disk 39a. ing.

  The orbiting scroll 40 has a disk-shaped disk 40a and a spiral wrap 40b formed on one surface of the disk 40a. The spiral scroll wrap 39 a of the orbiting scroll 40 is combined with the spiral scroll wrap 39 b of the fixed scroll 39 so as to be engaged with each other.

  A boss 40c is formed on the opposite surface of the orbiting scroll 40 to the disk 40a. On the other hand, an eccentric shaft 41 is provided at a position eccentric to the lower end portion of the rotary shaft 23 by a predetermined amount, and this eccentric shaft 41 is rotatably supported by the boss 40 c via the drive bush 42 and the bearing 43. . As a result, the orbiting scroll 40 can revolve by the rotation of the rotating shaft 23. Further, a rotation prevention mechanism 44 is interposed between the housing 11 and the disk 40a, and the orbiting scroll 40 is capable of revolving orbiting while preventing rotation.

  A refrigerant gas passage 45 penetrating along the axial direction is formed in the inner surface of the housing 11 in the outer peripheral portions of the frame 25 and the fixed scroll 39, and one end portion of the refrigerant gas passage 45 communicates with the low pressure chamber 28. ing. A suction chamber 46 is formed between the housing 11 and the fixed scroll 39, and a high-pressure chamber 47 is formed between the wraps 39 b and 40 b at the fitting portion between the fixed scroll 39 and the orbiting scroll 40. Has been. The other end of the refrigerant gas passage 45 communicates with the suction chamber 46, and the suction chamber 46 communicates with the high pressure chamber 47.

  Further, a discharge chamber 48 is formed in the fixed scroll 39, and the high pressure chamber 47 and the discharge chamber 48 communicate with each other via a discharge port 49, and the discharge port 49 can be opened and closed by a discharge valve 50. ing. The discharge chamber 48 is provided with a discharge pipe 51 that passes through the housing 11 to the outside.

  The refrigerant gas sucked into the housing 11 is a lubricating mist-containing gas in which lubricating oil for lubricating each part in the housing 11 is contained in a mist form, and is compressed into a liquid state. The oil is stored in the lower part of the housing 11 through an oil passage (not shown).

  Here, the operation of the scroll compressor of this embodiment described above will be described.

  When the electric motor 13 is driven, the orbiting scroll 40 is driven through the rotating shaft 23, the eccentric shaft 41, and the like, and the orbiting scroll 40 revolves on the revolution track while being prevented from rotating by the rotation preventing mechanism 44. Then, the low-pressure chamber 28 is in a negative pressure state, and low-temperature refrigerant gas is sucked into the low-pressure chamber 28 of the housing 11 from the suction pipe 30 and descends while cooling the electric motor 13 in the low-pressure chamber 28. Then, it is sucked into the high pressure chamber 47 through the suction chamber 46.

  When the orbiting scroll 40 is turned, the high pressure chamber 47 is gradually narrowed accordingly, and the refrigerant gas inside reaches the center while being compressed, and is discharged to the discharge chamber 48 through the discharge port 49. The discharge valve 50 opens and closes due to the differential pressure between the high pressure chamber 47 and the discharge chamber 48. That is, when the pressure of the refrigerant gas in the high pressure chamber 47 becomes higher than the pressure in the discharge chamber 48, the discharge valve 50 is pushed open and the refrigerant gas flows out into the discharge chamber 48. Thereafter, the refrigerant gas is discharged from the discharge chamber 48 through the discharge pipe 51 to the outside.

  At this time, electric power is supplied from an external battery through the input terminals 34 and 35 to the control board 15b and the power board 15a constituting the motor drive circuit 15 in this order, and further from the motor drive circuit 15 through the output terminal 36 and the connection line 37. The motor drive circuit 15 supplied to the current motor 13 and housed in the control chamber 14, in particular, the power board 15 a generates heat. However, since a part of the power board 15a is exposed from the housing opening 29 to the low-pressure chamber 28 side, the low-temperature refrigerant gas contacts the power board 15a and directly cools. Therefore, the power board 15a is deprived of the generated heat by the refrigerant gas, and the temperature rise can be suppressed.

  As described above, in the scroll compressor according to the first embodiment, the control chamber 14 is provided by being partitioned from the low pressure chamber 28 by the partition wall 27 on the upper portion of the housing 11 that accommodates the compression portion 12 and the electric motor 13. 14, the motor drive circuit 15 is provided, and the power board 15a is mounted on the partition wall 27 so as to close the housing opening 29, so that the refrigerant gas sucked into the low pressure chamber 28 is passed through the housing opening 29 to the power board 15a. I try to contact them.

  Accordingly, a part of the power board 15a constituting the motor drive circuit 15 is exposed to the low pressure chamber 28 from the housing opening 29, and the low-temperature refrigerant sucked into the low pressure chamber 28 of the housing 11 during the operation of the compressor. By directly cooling the gas in contact with the heat generating power board 15a, the temperature rise is suppressed, so that the motor drive circuit 15 can be efficiently cooled and the cooling efficiency can be improved. As a result, by improving the cooling efficiency of the motor drive circuit 15, it is not necessary to provide a separate cooling device, and the entire device can be reduced in size and cost, or the operating efficiency can be improved.

  In the control chamber 14, the power board 15a constituting the motor drive circuit 15 is mounted on the low pressure chamber 28 side and directly cooled by the refrigerant gas, and the control board 15b mounted on the cover 31 is made of copper having high thermal conductivity. The input terminals 34 and 35 are connected. Therefore, the cooling heat of the low-temperature refrigerant gas transmitted to the power board 15a is transmitted to the control board 15b via the input terminals 34 and 35 to be cooled, and the motor drive circuit 15 is efficiently cooled by the refrigerant gas. can do.

  Further, in the control chamber 14, U-shaped input terminals 34 and 35 are arranged with elasticity between the power board 15a and the control board 15b. Therefore, the power board 15a is brought into close contact with the partition wall 27 via the O-ring 33 by the elastic force of the input terminals 34 and 35, and closes the housing opening 30. Leakage of the refrigerant gas can be reliably prevented. In this case, U-shaped input terminals 34 and 35 are applied as urging means for pressing the power board 15a against the partition wall 27, so that the members can be shared and accommodated in a narrow space. This can contribute to downsizing and cost reduction. The input terminals 34 and 35 are disposed opposite to each other in the opposite direction so that the elastic force can be applied to the power board 15a evenly in the horizontal direction. Can be supported.

  Further, the connection portions 34 b and 35 b of the input terminals 34 and 35 penetrate the cover 31 and protrude to the outside, and are fixed to terminal blocks 31 a and 31 b formed integrally with the cover 31. Therefore, the connection portions 34b and 35b of the input terminals 34 and 35 can be stably supported, the wiring can be easily connected, and the connection portions 34b and 35b are exposed to the outside. A heat radiation effect such as 15b can be expected.

  FIG. 4 is a cross-sectional view of a main part of a scroll compressor to which the electric compressor according to the second embodiment of the present invention is applied. In addition, the same code | symbol is attached | subjected to the member which has the same function as what was demonstrated in the Example mentioned above, and the overlapping description is abbreviate | omitted.

  In the scroll type compressor as the electric compressor of the second embodiment, as shown in FIG. 4, the power board 15 a is fixed to the partition wall 27 on the low pressure chamber 28 side by the fastening bolt 61 in the control chamber 14. The housing opening 30 is closed, and a sealing member (for example, an O-ring) 62 is interposed between the power board 15a and the partition wall 27. Therefore, the back surface of the power board 15 a is exposed to the low pressure chamber 28 through the housing opening 30, and can be directly cooled by the refrigerant gas sucked into the low pressure chamber 28.

  Further, the sealing member 62 is interposed between the power board 15a and the partition wall 27, so that the housing opening 30 is reliably closed. In this case, the material and hardness of the sealing member 62 are not limited. By adjusting the height, the height position of the power board 15a can be adjusted. That is, a copper connection bar 64 is fixed to the power board 15 a via the terminal 63 by the fastening bolt 65, and the connection bar 64 is electrically connected to the capacitor 66. Therefore, by adjusting the material and hardness of the seal member 62, the elastic force changes, the height position of the power board 15a is adjusted, and the connection state between the terminal 63 and the connection bar 64 can be stabilized. . As the seal member, silicon rubber, fluorine rubber, hydrogenated nitrile rubber or the like is desirable.

  In each of the above-described embodiments, the U-shaped input terminals 34 and 35 are arranged with elasticity between the power board 15a and the control board 15b. However, the power board 15a and the control board 15b are separated from each other. The wall 27 and the cover 31 may be in a free state, temporarily fixed, or fixed. The urging member is not limited to the input terminals 34 and 35, and may be a compression spring, a leaf spring, a rubber member or the like stretched between the power board 15a fixed to the partition wall 27 or the cover 31 and the control board 15b. There may be.

  Further, the power board 15a is attached to the partition wall 27 so as to close the housing opening 29, so that a part of the back surface of the power board 15a is exposed to the low pressure chamber 28. A convex portion may be formed and fitted into the housing opening 29, or the convex portion of the power board 15a may be positively projected toward the low pressure chamber 28 side.

  In addition, the motor drive circuit 15 includes the power board 15a and the control board 15b, and the power board 15a is mounted on the low pressure chamber 28 side and the control board 15b is mounted on the cover 31 side. If the mounting space of the chamber 14 is sufficient, the power board 15a and the control board 15b may be mounted on the low pressure chamber 28 side, and may be set as appropriate according to the configuration of the electric compressor.

  In each of the above-described embodiments, the electric compressor has been described as a scroll compressor. However, the configuration of the compression unit is not limited to this structure. Further, although described as a vertical type electric compressor, it may be a horizontal type and has a structure in which a part of the substrate of the motor drive circuit 15 provided in the control chamber is exposed to the low pressure chamber 28 side so that the refrigerant gas can contact it. I just need it.

  The electric compressor according to the present invention is such that a part of the motor drive circuit accommodated in the control chamber is exposed to the low pressure chamber and directly cooled by the refrigerant gas, thereby improving the cooling efficiency. This type of electric compressor can also be applied.

It is sectional drawing showing the whole structure of the scroll compressor to which the electric compressor which concerns on Example 1 of this invention was applied. It is II-II sectional drawing of FIG. It is a perspective view of the input terminal in the scroll compressor of Example 1. FIG. It is principal part sectional drawing of the scroll compressor to which the electric compressor which concerns on Example 2 of this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Housing 12 Compression part 13 Electric motor 14 Control chamber 15 Motor drive circuit 15a Power board 15b Control board 27 Partition wall 28 Low pressure chamber 29 Housing opening 30 Suction pipe 31 Cover 33 O-ring (seal member)
34, 35 Input terminal 46 Suction chamber 47 High pressure chamber 48 Discharge chamber

Claims (8)

  A hollow housing, a compression part that is provided on one end side of the housing and compresses the refrigerant gas sucked into the housing, and an electric motor that is provided on the other end side of the housing and drives the compression part A control chamber provided at the other end of the housing and separated from the low-pressure chamber, a motor drive circuit provided in the control chamber, and a refrigerant gas sucked into the low-pressure chamber in the motor of the control chamber An electric compressor comprising an opening for contacting a substrate of a drive circuit.   2. The electric compressor according to claim 1, wherein the opening is formed in a partition wall provided between the low pressure chamber and the control chamber, and a substrate of the motor drive circuit is configured to open the opening from the control chamber side. An electric compressor characterized by being fixed to the partition wall so as to be closed.   3. The electric compressor according to claim 2, wherein a sealing member is interposed on a contact surface between the substrate and the partition wall, and the substrate is pressed and supported by the partition wall by an urging means. Machine.   4. The electric compressor according to claim 3, wherein the biasing means is configured by a U-shaped input terminal for supplying electric power to the motor drive circuit from the outside.   4. The electric compressor according to claim 3, wherein the input terminal is a pair of metal bars, and is disposed in the control chamber in opposite directions facing left and right.   2. The electric compressor according to claim 1, wherein the motor driving circuit includes a power board on which a power element is mounted and a control board on which a small power element is mounted, and the power board is disposed on a low pressure chamber side in the control chamber. The control board is mounted on the wall surface of the control chamber facing the power board, and an input terminal having a U shape is elastically mounted between the power board and the control board, so that the control board is externally provided. The electric compressor can supply the power to the power board and the control board, and can press and support the power board against the partition wall to close the opening.   7. The electric compressor according to claim 6, wherein the control chamber can be sealed by fixing a cover to the other end opening of the housing, and the control board is mounted on an inner surface of the cover. Electric compressor.   8. The electric compressor according to claim 7, wherein an end portion of the input terminal penetrates the cover and protrudes to the outside, and is fixed to a terminal block integrally formed with the cover.

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