JP2005282550A - 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 fixed to the upper part of the body housing 11 storing a compression part 12 and an electric motor 13, 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 compressor described in Patent Document 1 is integrally provided with a unit housing that accommodates an inverter that controls an electric motor outside the machine body, and passes through a cylinder body through which the suction refrigerant passes. A switching element, which is a highly heat-generating component, is attached to the outer periphery of the body, and the switching element is cooled by a suction refrigerant flowing through the cylinder.

JP 2002-161859 A

  However, in the above-described conventional compressor, the switching element is attached to the outer periphery of the cylinder through the unit housing that houses the inverter, and the switching element is cooled by the suction refrigerant flowing through the cylinder, The cooling area of the switching element by the cylinder is narrow, and the switching element cannot be sufficiently cooled. There are a plurality of parts constituting the inverter other than the switching element, and these parts cannot be cooled.

  The present invention solves the above-described problems, and an object of the present invention is to provide an electric compressor that improves the cooling efficiency by efficiently transmitting the cooling heat of the refrigerant gas sucked into the housing. .

  In order to achieve the above object, an electric compressor according to a first aspect of the present invention includes a housing having a hollow shape, 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 on the other end side of the housing for driving the compression unit, a refrigerant mooring chamber provided on the other end side of the housing, and a refrigerant suction portion provided on one end of the refrigerant mooring chamber And a refrigerant passage communicating the other end of the refrigerant mooring chamber and the low pressure chamber of the housing.

  In the electric compressor according to the second aspect of the present invention, a control chamber is provided between the refrigerant mooring chamber and the low pressure chamber, and a motor drive circuit for driving and controlling the electric motor is provided in the control chamber. It is said.

  In the electric compressor according to a third aspect of the invention, the motor drive circuit has a plurality of metal substrates, and a metal substrate having a large calorific value among the metal substrates is fixed to the refrigerant mooring chamber side. Yes.

  According to a fourth aspect of the present invention, the motor drive 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 fixed to the refrigerant mooring chamber side. The control board is fixed to the low-pressure chamber side.

  In an electric compressor according to a fifth aspect of the present invention, the refrigerant passage is provided so as to penetrate the control chamber.

  In the electric compressor according to a sixth aspect of the invention, the electric motor is disposed in the low pressure chamber, and an output terminal from the motor drive circuit provided in the control chamber passes through the low pressure chamber and is connected to the electric motor. It is characterized by that.

  The electric compressor according to a seventh aspect of the invention is characterized in that a flow passage area of the refrigerant mooring chamber is set larger than flow passage areas of the refrigerant suction portion and the refrigerant passage.

  According to the electric compressor of the first aspect of the present invention, the refrigerant mooring chamber is provided on the other end side of the main body housing that accommodates the compression portion and the electric motor, and the refrigerant suction portion is provided at one end of the refrigerant mooring chamber. Since the other end of the mooring chamber and the low pressure chamber of the housing are communicated by the refrigerant passage, the refrigerant gas enters the refrigerant mooring chamber from the refrigerant suction portion, and flows through the refrigerant mooring chamber properly, and then passes through the refrigerant passage. The refrigerant gas is sucked into the chamber, and the stagnation of the refrigerant gas in the refrigerant mooring chamber can be eliminated. When a member to be cooled is disposed in the vicinity of the refrigerant mooring chamber, the cooling heat of the refrigerant gas is supplied to the member to be cooled. It is possible to transmit efficiently and to improve the cooling efficiency.

  According to the electric compressor of the second aspect of the present invention, the control chamber is provided between the refrigerant mooring chamber and the low pressure chamber, and the motor driving circuit for driving and controlling the electric motor is provided in the control chamber. The cooling heat of the refrigerant gas flowing in the low pressure chamber is transmitted to the motor drive circuit of the control chamber, and this motor drive circuit can be efficiently cooled.

  According to the electric compressor of the third aspect of the present invention, the motor drive circuit is constituted by a plurality of metal substrates, and among these metal substrates, the metal substrate having a large heat generation amount is fixed to the refrigerant mooring chamber side. Many metal substrates can be effectively cooled by a relatively low-temperature refrigerant gas flowing through the refrigerant mooring chamber.

  According to the electric compressor of the invention of claim 4, 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 fixed to the refrigerant mooring chamber side. Since the control board is fixed to the low pressure chamber side, the power board with a large amount of heat generation is cooled by a relatively low temperature refrigerant gas flowing through the refrigerant mooring chamber, and the control board with a small amount of heat generation is cooled by the refrigerant gas flowing through the low pressure chamber. Thus, heat generation in the control room can be efficiently suppressed.

  According to the electric compressor of the fifth aspect of the present invention, since the refrigerant passage is provided so as to penetrate the control chamber, there is no projecting object to the outside of the housing, and the mountability to a vehicle or the like can be improved.

  According to the electric compressor of the sixth aspect of the invention, the electric motor is disposed in the low pressure chamber, and the output terminal is passed through the low pressure chamber from the motor drive circuit of the control chamber and connected to the electric motor. The electric motor can be cooled by the refrigerant gas sucked into the low-pressure chamber, and the connection between the motor drive circuit and the electric motor can be easily routed.

  According to the electric compressor of the seventh aspect of the invention, since the flow passage area of the refrigerant mooring chamber is set larger than the flow passage areas of the refrigerant suction portion and the refrigerant passage, the flow of the refrigerant gas in the refrigerant mooring chamber is stagnated. The cooling efficiency can be further improved by enlarging the contact area between the refrigerant gas and the inner surface of the refrigerant mooring chamber.

  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.

  FIG. 1 is a cross-sectional view illustrating an overall configuration of a scroll compressor to which an electric compressor according to Embodiment 1 of the present invention is applied, and FIG. 2 is a plan view of the scroll compressor according to Embodiment 1.

  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 FIG. 1, the scroll compressor includes a main body housing 11 having a hollow shape, a compression section 12 accommodated in the main body housing 11, an electric motor 13 for driving the compression section 12, and a main body. A control housing 14 having a hollow shape fixed to the upper portion of the housing 11 and a motor drive circuit 15 accommodated in the control housing 14 are provided.

  The main body housing 11 is disposed vertically and is formed as a substantially cylindrical sealed container that wraps the entire scroll compressor, and is configured by assembling a plurality of members (not shown). The electric motor 13 accommodated in the main body housing 11 is provided with a rotor 22 with 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 main body housing 11, and the lower end portion is rotated by a bearing portion 26 of a frame 25 fixed to the lower inner surface of the main body housing 11. It is supported freely.

  The control housing 14 having a hollow shape is fixed to the upper end portion of the main body housing 11 with fastening bolts, and a horizontal partition wall 27 is provided inside, so that a refrigerant mooring chamber 28 is formed on the upper side, and the lower side A control chamber 29 is formed. The refrigerant mooring chamber 28 is a passage having an elliptical shape in plan view, and is provided in one end portion so that a suction pipe (refrigerant suction portion) 30 penetrates from above, and a lower control chamber 29 in the other end portion. In addition, a communication pipe (refrigerant passage) 32 penetrating the upper wall 11a of the main body housing 11 and communicating with the low pressure chamber 31 is provided.

  On the other hand, the control chamber 29 is a space having a circular shape in plan view, and houses a motor drive circuit 15 that controls the drive of the electric motor 13 and the like. 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 29, the power board 15a is fixed to the lower surface of the partition wall 27 on the refrigerant mooring chamber 28 side, while the control board 15b is fixed to the upper surface of the upper wall 11a of the housing 11 on the low pressure chamber 31 side. Yes.

  In this case, the flow passage area of the refrigerant mooring chamber 28 is set to be larger than the flow passage areas of the suction pipe 30 and the communication pipe 32, and the refrigerant gas flows slowly from the suction pipe 30 into the refrigerant mooring chamber 28 and communicates. The air is sucked into the low pressure chamber 31 through the pipe 32, and at this time, the control housing 14 itself is cooled. Therefore, the refrigerant gas has higher cooling efficiency on the upstream side, that is, on the refrigerant mooring chamber 28 side than on the low pressure chamber 31 side, and by fixing the power substrate 15a having a large calorific value on the refrigerant mooring chamber 28 side, It is designed to cool properly. Therefore, the control housing 14 is formed of a material having a relatively high thermal conductivity. Specifically, it is desirable that the main body housing 11 is made of iron and the control housing 14 is made of copper or aluminum. It is not limited to this material.

  Further, an input terminal 33 is wired from the outside through the side wall of the control housing 14 in the control chamber 29, and a battery (not shown) is connected to the base end, while the tip is connected to the power board 15a. After that, it is bent into a U shape and connected to the control board 15b. The output terminal 34 is connected to the power board 15 a at the base end portion, and the distal end portion extends through the upper wall 11 a of the housing 11 to the low pressure chamber 31 and is connected to the electric motor 13. In this case, the output terminal 34 extends to the low pressure chamber 31 and is directly cooled by the refrigerant gas, so that the power board 15a and the control board 15b are cooled as a heat transfer body of a predetermined thickness, for example, a copper bar. It may be possible. In this case, the surface of the output terminal 33 may be covered with an epoxy resin, varnish, glass or the like as an insulator in order to prevent electric leakage.

  Accordingly, when the refrigerant gas flows from the suction pipe 30 through the refrigerant mooring chamber 28, the power substrate 15 a in close contact with the refrigerant mooring chamber 28 can be cooled, and then sucked into the low pressure chamber 31 from the communication pipe 32. Thus, the control board 15b in close contact with the low-pressure chamber 31 can be cooled, and further, the refrigerant gas taken into the main body housing 11 is sent downward to cool the electric motor 13 and the control board 15b. be able to.

  The compression unit 12 accommodated in the lower part of the main body housing 11 is a scroll type compression mechanism that compresses the refrigerant gas absorbed in the low pressure chamber 31 and includes a fixed scroll 35 and a turning scroll 36. ing. The fixed scroll 35 is fitted to the inner peripheral surface of the main body housing 11 and fixed by fastening bolts, and has a disk-shaped disk 35a and a spiral wrap 35b formed on one surface of the disk 35a. doing.

  The orbiting scroll 36 has a disk-shaped disk 36a and a spiral wrap 36b formed on one surface of the disk 36a. The spiral scroll wrap 36 a of the orbiting scroll 36 is combined with the spiral scroll wrap 35 b of the fixed scroll 35.

  A boss 36c is formed on the surface of the orbiting scroll 36 opposite to the disk 36a. On the other hand, an eccentric shaft 37 is provided at a position eccentric to the lower end of the rotary shaft 23 by a predetermined amount, and this eccentric shaft 37 is rotatably supported by a boss 36c via a drive bush 38 and a bearing 39. . As a result, the orbiting scroll 36 can revolve by the rotation of the rotating shaft 23. Further, a rotation prevention mechanism 40 is interposed between the main body housing 11 and the disk 36a, and the orbiting scroll 36 is capable of revolving orbiting while preventing rotation.

  A refrigerant gas passage 41 penetrating along the axial direction is formed in the inner surface of the main body housing 11 at the outer peripheral portions of the frame 25 and the fixed scroll 35, and one end portion of the refrigerant gas passage 41 communicates with the low pressure chamber 31. doing. In addition, a suction chamber 42 is formed between the main body housing 11 and the fixed scroll 35, and a high-pressure chamber 43 is provided between the wraps 35 b and 36 b at the fitting portion between the fixed scroll 35 and the orbiting scroll 36. Is formed. The other end of the refrigerant gas passage 41 communicates with the suction chamber 42, and the suction chamber 42 communicates with the high-pressure chamber 43.

  Further, a discharge chamber 44 is formed in the fixed scroll 35, and the high-pressure chamber 43 and the discharge chamber 44 communicate with each other via a discharge port 45, and the discharge port 45 can be opened and closed by a discharge valve 46. ing. The discharge chamber 44 is provided with a discharge pipe 47 penetrating outside through the main body housing 11.

  The refrigerant gas sucked into the main body housing 11 is a lubricating mist-containing gas in which lubricating oil for lubricating each part in the main body housing 11 is contained in a mist form, and is compressed into a liquid state. The lubricating oil is stored in the lower part of the main body 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 36 is driven through the rotating shaft 23, the eccentric shaft 37, and the like, and the orbiting scroll 36 revolves on the revolution track while being prevented from rotating by the rotation preventing mechanism 40. Then, the low pressure chamber 31 is in a negative pressure state, and low-temperature refrigerant gas is sucked into the low pressure chamber 31 of the main body housing 11 from the suction pipe 30 through the refrigerant mooring chamber 38 and the communication pipe 32, and in this low pressure chamber 31, the electric motor 13 The refrigerant descends while cooling, passes through the refrigerant gas passage 41, and is sucked into the high-pressure chamber 43 through the suction chamber 42.

  When the orbiting scroll 36 is turned, the high pressure chamber 43 is gradually narrowed accordingly, and the refrigerant gas inside reaches the center while being compressed, and is discharged to the discharge chamber 44 through the discharge port 45. The discharge valve 46 opens and closes due to the differential pressure between the high pressure chamber 43 and the discharge chamber 44. That is, when the pressure of the refrigerant gas in the high-pressure chamber 43 becomes higher than the pressure in the discharge chamber 44, the discharge valve 46 is pushed open and the refrigerant gas flows out into the discharge chamber 44. Thereafter, the refrigerant gas is discharged from the discharge chamber 44 through the discharge pipe 47 to the outside.

  At this time, electric power is supplied from an external battery to the motor drive circuit 15 through the input terminal 33, and further supplied from the motor drive circuit 15 to the current motor 13 through the output terminal 34, and the motor housed in the control chamber 29. The power board 15a and the control board 15b as the drive circuit 15 generate heat. However, since the power substrate 15a is fixed to the refrigerant mooring chamber 28 side, when the low-temperature refrigerant gas flows through the refrigerant mooring chamber 28, the refrigerant gas cools the power substrate 15a via the refrigerant mooring chamber 28. To do. Further, since the control board 15b is fixed to the low-pressure chamber 31 side, when the low-temperature refrigerant gas flows through the low-pressure chamber 31, the refrigerant gas cools the power board 15a via the refrigerant mooring chamber 28. Therefore, the generated heat is deprived from each of the substrates 15a and 15b 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 housing 14 is fixed to the upper portion of the main body housing 11 that accommodates the compression portion 12 and the electric motor 13, and the refrigerant mooring chamber 28 and the control in the control housing 14. The chamber 29 is provided, the suction pipe 30 is provided at one end of the refrigerant mooring chamber 28, and the communication pipe 56 that passes through the control chamber 29 and communicates with the low-pressure chamber 31 is provided at the other end. A motor drive circuit 15 for controlling the drive of the above is accommodated.

  Therefore, when the low-temperature refrigerant gas sucked into the control housing 14 flows through the refrigerant mooring chamber 28 during the operation of the compressor, the cooling is performed from the wall surface of the refrigerant mooring chamber 28 to the control chamber 29. By cooling the power board 15a and the control board 15b as the motor drive circuit 15 that is transmitted to and generates heat, the temperature rise is suppressed, and the motor drive circuit 15 is efficiently cooled and the cooling efficiency is improved. can do. At this time, the refrigerant mooring chamber 28 has a flow passage area larger than the flow passage area of the suction pipe 30 and the communication pipe 32, and the refrigerant gas slowly flows at a low flow rate in the refrigerant mooring chamber. The cooling efficiency of the refrigerant mooring chamber 28 is improved, and the motor drive circuit 15 of the control chamber 29 can be reliably cooled. As a result, by improving the cooling efficiency, it is possible to reduce the size and cost of the entire apparatus or improve the operation efficiency.

  In the control chamber 29, the power board 15a constituting the motor drive circuit 15 is fixed to the lower surface of the partition wall 27 on the refrigerant mooring chamber 28 side, and the control board 15b is fixed on the upper wall 11a of the housing 11 on the low pressure chamber 31 side. It is fixed on the top surface. Accordingly, the low-temperature refrigerant gas cools the power board 15a via the refrigerant mooring chamber 28 on the upstream side thereof, and cools the control board 15b via the low-pressure chamber 31 on the downstream side thereof. Since the power board 15a that generates a large amount of heat is cooled on a certain upstream side, the motor drive circuit 15 can be efficiently cooled by the refrigerant gas.

  Further, since the control chamber 29 is disposed between the refrigerant mooring chamber 28 and the low pressure chamber 31, it can be cooled by the refrigerant gas from above and below the control chamber 29, and a motor drive circuit accommodated in the control chamber 29. 15 can be efficiently cooled. Further, a communication pipe 32 that communicates between the refrigerant mooring chamber 28 and the low pressure chamber 31 is provided so as to penetrate the control chamber 29, and the control chamber 29 can be cooled even by refrigerant gas passing through the communication pipe 32, The cooling efficiency can be further improved. In this case, the communication pipe 32 may be lengthened or bent in the control chamber 39 to increase the cooling area. The arrangement structure of the communication pipe 32 may be changed to increase the contact area of the refrigerant gas. By changing, the heat capacity can be adjusted.

  FIG. 3 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.

  As shown in FIG. 3, the scroll compressor as the electric compressor according to the second embodiment includes a control housing 51 having a hollow shape fixed to the upper side surface of the main body housing 11 that houses the compression unit 12 and the electric motor 13. And a motor drive circuit 15 accommodated in the control housing 51.

  A control housing 51 having a hollow shape is fixed to the upper side surface of the main body housing 11 arranged vertically by fastening bolts, and a vertical partition wall 52 is provided inside, so that the refrigerant mooring chamber 53 is provided outside. The control chamber 54 is formed inside, that is, on the main body housing 11 side. The refrigerant mooring chamber 53 is a passage that is vertically long in a side view, and is provided at the lower end portion so that a suction pipe (refrigerant suction portion) 55 penetrates from the outside. The control chamber 54 and the main body housing are provided at the upper end portion. 11 is provided with a communication pipe (refrigerant passage) 56 that communicates with the low-pressure chamber 31 through the side wall 11b of the eleventh side.

  On the other hand, the control chamber 54 is a space having a rectangular shape when viewed from the side, and houses a motor drive circuit 15 that controls the drive of the electric motor 13 and the like. That is, in the control chamber 54, the power board 15a is fixed to the wall surface of the partition wall 52 on the refrigerant mooring chamber 53 side, while the control board 15b is fixed to the side wall 11b of the housing 11 on the low pressure chamber 31 side. An input terminal 57 is wired in the control chamber 54, and ends thereof are connected to the power board 15a and the control board 15b. The output terminal 58 has a proximal end connected to the power board 15 a and a distal end extending through the side wall 11 b of the housing 11 to the low pressure chamber 31 and connected to the electric motor 13.

  In this case, the refrigerant gas flows from the suction pipe 55 into the refrigerant mooring chamber 53 and flows through the communication pipe 56 and is sucked into the low-pressure chamber 31. The power board 15a having a large heat generation amount can be cooled through the mooring chamber 53. Therefore, it is desirable to form the control housing 51 with a material having high thermal conductivity such as copper or aluminum. Further, since the output terminal 57 is also extended to the low pressure chamber 31 and cooled, it is desirable that the output terminal 57 be made of a material such as copper or aluminum having a high thermal conductivity, like the control housing 51.

  Accordingly, when the refrigerant gas flows through the refrigerant mooring chamber 53 from the suction pipe 55, the power board 15 a in close contact with the refrigerant mooring chamber 53 can be cooled, and thereafter, sucked into the low pressure chamber 31 from the communication pipe 56. Thus, the control board 15b in close contact with the low pressure chamber 31 can be cooled, and further, the refrigerant gas taken into the main body housing 11 is sent downward, whereby the electric motor 13 can be cooled.

  As described above, in the scroll compressor according to the second embodiment, the control housing 51 is fixed to the side portion of the main body housing 11 that accommodates the compression portion 12 and the electric motor 13, and the refrigerant mooring chamber 53 and the control housing 51 are provided in the control housing 51. A control chamber 54 is provided, a suction pipe 55 is provided at the lower end portion of the refrigerant mooring chamber 53, and a communication pipe 56 that penetrates the control chamber 29 and communicates with the low pressure chamber 31 is provided at the upper end portion. A motor drive circuit 15 for controlling the drive of the above is accommodated.

  Therefore, during operation of the compressor, the low-temperature refrigerant gas flows through the refrigerant mooring chamber 53 and cools the surroundings, and then is sucked into the low-pressure chamber 31 through the communication pipe 56. The cooling heat is transmitted from the wall surface to the control chamber 54 to cool the power board 15a and the control board 15b, and the motor drive circuit 15 can be efficiently cooled to suppress the temperature rise. As a result, by improving the cooling efficiency, it is possible to reduce the size and cost of the apparatus or improve the operation efficiency.

  Further, the control housing 51 is fixed to the side portion of the main body housing 11, and the refrigerant mooring chamber 53 and the control chamber 54 are provided therein, so that the height of the entire compressor can be kept low, so that it can be mounted on a vehicle or the like. Can be improved. Further, the refrigerant gas is sucked from the refrigerant mooring chamber 53 into the low pressure chamber 31 along the radial direction of the electric motor 13, and the refrigerant gas can be uniformly fed to the electric motor 13 to be cooled.

  In each of the above-described embodiments, the refrigerant mooring chambers 28 and 53 and the control chambers 29 and 54 are formed in the control housings 14 and 51, and the control chambers 29 and 54 penetrate from the refrigerant mooring chambers 28 and 53 to the low pressure. Although the communication pipes 32 and 56 communicating with the chamber 31 are provided, the present invention is not limited to this structure, and a refrigerant passage is integrally formed in the control housing so as not to penetrate the control chamber, or control is performed outside the control housing. A communication pipe may be provided so as to bypass the chamber.

  In each embodiment, the refrigerant mooring chambers 28 and 53, the control chambers 29 and 54, and the low pressure chamber 31 are provided in parallel. However, by providing the refrigerant mooring chamber so as to surround the control chambers 29 and 54, both The contact area may be increased to improve the cooling efficiency. In this case, a refrigerant passage that directly connects the refrigerant mooring chambers 28 and 53 and the low pressure chamber 31 may be provided. The shape of the refrigerant mooring chambers 28 and 53 is not limited to a linear space, and may be a bent space, a spiral space, or a simple large space. A refrigerant suction portion is provided at one end and a low pressure is provided at the other end. The number of the refrigerant mooring chambers is not limited to one, and a plurality of refrigerant passages may be provided.

  Further, the motor drive circuit 15 is composed of the power board 15a and the control board 15b, the power board 15a is provided on the refrigerant mooring chambers 28 and 53 side, and the control board 15b is provided on the low pressure chamber 31 side. Instead, it may be set as appropriate according to the configuration of the electric compressor.

  Further, the control housings 14 and 51 are provided separately from the main body housing 11 and the refrigerant mooring chambers 28 and 53 are formed therein. However, the main body housing and the control housing are provided integrally to form a low pressure chamber and a refrigerant mooring chamber inside. May be. In addition, the control chambers 29 and 54 are formed between the refrigerant mooring chambers 28 and 53 and the low pressure chamber 31 to store the motor drive circuit 15, but instead of the control chamber, a storage chamber for storing members to be cooled is provided. May be.

  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. Moreover, although it demonstrated as a vertical type electric compressor, a horizontal type may be sufficient and it should just be set as the structure where refrigerant | coolant gas is suck | inhaled by the low pressure chamber through a refrigerant | coolant anchoring chamber.

  The electric compressor according to the present invention is provided with a refrigerant mooring chamber on the other end side of the housing, and the refrigerant gas is sucked into the low pressure chamber after passing through the mooring chamber, thereby improving the cooling efficiency. Yes, it can be applied to any kind of electric compressor.

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. 1 is a plan view of a scroll compressor according to Embodiment 1. FIG. It is a principal part longitudinal cross-sectional view of the scroll compressor to which the electric compressor based on Example 2 of this invention was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Housing 12 Compression part 13 Electric motor 14,51 Control housing 15 Motor drive circuit 15a Power board 15b Control board 28,53 Refrigerant mooring chamber 29,54 Control room 30,55 Suction pipe (refrigerant suction part)
31 Low pressure chamber 32, 56 Communication pipe (refrigerant passage)
33,57 Input terminal 34,58 Output terminal 42 Suction chamber 43 High pressure chamber 44 Discharge chamber

Claims (7)

  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 refrigerant mooring chamber provided at the other end of the housing, a refrigerant suction portion provided at one end of the refrigerant mooring chamber, and the other end of the refrigerant mooring chamber and the low pressure chamber of the housing. An electric compressor characterized by comprising a refrigerant passage.   2. The electric compressor according to claim 1, wherein a control chamber is provided between the refrigerant mooring chamber and the low pressure chamber, and a motor drive circuit for driving and controlling the electric motor is provided in the control chamber. Electric compressor to do.   3. The electric compressor according to claim 2, wherein the motor drive circuit includes a plurality of metal substrates, and a metal substrate having a large calorific value among the metal substrates is fixed to the refrigerant mooring chamber side. Electric compressor.   4. The electric compressor according to claim 2, wherein the motor drive 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 located on the refrigerant mooring chamber side. An electric compressor which is fixed and the control board is fixed to the low-pressure chamber side.   5. The electric compressor according to claim 2, wherein the refrigerant passage is provided through the control chamber. 6.   6. The electric compressor according to claim 2, wherein the electric motor is disposed in the low-pressure chamber, and an output terminal passes through the low-pressure chamber from the motor drive circuit provided in the control chamber. And an electric compressor connected to the electric motor.   The electric compressor according to any one of claims 1 to 6, wherein a flow passage area of the refrigerant mooring chamber is set larger than flow passage areas of the refrigerant suction portion and the refrigerant passage. Electric compressor.

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