JP6204867B2 - Electric compressor - Google Patents

Description

  The present invention relates to an electric compressor including an electric circuit.

  Conventionally, Patent Document 1 discloses an electric compressor including an inverter (electric circuit) that supplies electric power to an electric motor. More specifically, the electric compressor of Patent Document 1 includes a compression mechanism that compresses and discharges a fluid, and a housing that houses an electric motor that outputs a rotational driving force that drives the compression mechanism. A flat mounting surface is formed on the outer peripheral side, and an inverter is mounted on this mounting surface.

  Furthermore, some structural members such as electric elements constituting this type of inverter are accompanied by heat generation during operation. Therefore, in the electric compressor of Patent Document 1, heat exchange between the constituent member of the inverter that generates heat during operation and the suction fluid of the compression mechanism that is relatively low in the housing is possible. The constituent members of the inverter are attached to the attachment surface. Thereby, the temperature rise of a structural member is suppressed and it is going to improve the reliability of an inverter.

Japanese Patent No. 3744522

  By the way, the inverter is configured by a plurality of types of constituent members, and generally, the plurality of types of constituent members are formed in different shapes. On the other hand, in the electric compressor of patent document 1, since the attachment surface is formed in a flat surface shape, when the inverter is attached to the housing, there is a protrusion dimension that the inverter protrudes from the attachment surface to the outside of the housing. , It is determined by the dimension of the largest physique among the constituent members.

  For this reason, like the electric compressor of patent document 1, when the structural member of an inverter is attached to the attachment surface formed in the flat surface shape, the thing of a comparatively big physique is used for one of the structural members of an inverter. If it is included, it is difficult to reduce the size of the compressor as a whole.

  On the other hand, there can be considered a means for attaching a stepped portion or the like on the mounting surface to attach a constituent member having a large physique to the recessed portion. However, if such a stepped portion or the like is provided, the suction fluid passage for allowing the suction fluid to flow is provided. This may lead to complication or reduction in the cross-sectional area of the suction fluid passage, and the constituent members may not be sufficiently cooled.

  In view of the above points, an object of the present invention is to reduce the size of an electric compressor including an electric circuit and to sufficiently cool constituent members of the electric circuit.

The present invention has been devised to achieve the above object. In the invention described in claim 1, the compression mechanism (20) for compressing and discharging the fluid and the rotation for driving the compression mechanism (20) are provided. An electric motor (30) that outputs a driving force, a housing (10) that houses the compression mechanism (20) and the electric motor (30), and an electric power that is fixed to the housing (10) and is supplied to the electric motor (30) An electric compressor comprising an electric circuit (40),
The housing (10) has a partition member (12) that partitions a motor housing space (10a) in which the electric motor (30) is housed and an electric circuit placement space (10b) in which the electric circuit (40) is placed. ,
An attachment surface (12b) to which at least a part of the constituent members (IG, C, H) constituting the electric circuit (40) is attached is formed on the electric circuit arrangement space (10b) side of the partition member (12). And
On the mounting surface (12b), a stepped portion (12c) protruding toward the electric circuit (40) is formed,
A first suction space (S1) into which the suction fluid sucked into the compression mechanism (20) flows is formed on the electric circuit arrangement space (10b) side inside the stepped portion (12c) .
The step portion (12c) closes the first suction space (S1) from the electric circuit arrangement space (10b) side and at least part of the constituent members (IG, C, H) constituting the electric circuit (40). Is attached a first lid member (14) arranged in contact with,
Further, the partition member (12) has a second lid member (S2) which is disposed in the motor housing space (10a) and forms a second suction space (S2) for allowing suction fluid to flow between the partition member (12). 13a) is attached,
The second suction space (S2) communicates with the suction port (13d) side of the compression mechanism (20),
Inside the compartment member (12) features a first suction space (S1) and the second suction space (S2) and Tei Ru electric compressor is sucked fluid communication path for communicating (X) is formed a.

  According to this, the component (IG) of the electric circuit (40) arranged so as to come into contact with the first lid member (14) and the suction fluid in the first suction space (S1) having a relatively low temperature. It is possible to cool the constituent member (IG) of the electric circuit (40) disposed so as to be in contact with the first lid member (14) through heat exchange via the first lid member (14).

  Here, “at least a part of the constituent members (IG, H, C)” described in the claims is not limited to the meaning of at least a part of the constituent members, and there are a plurality of electric circuits (40). When it is constituted by the constituent members (IG, C, H), the meaning of at least one constituent member (IG) among the plurality of constituent members (IG, C, H) is also included.

  Further, when the electric circuit (40) is constituted by a plurality of constituent members (IG, C, H), the remaining configuration other than the constituent members arranged so as to contact the first lid member (14) The members (C, H) can be disposed close to the partition member (12).

At this time, since the stepped portion (12c) is formed on the mounting surface (12b) of the partition member (12) , the component member (IG... H) of the electric circuit (40) having a relatively small physique is used. 1 It arrange | positions so that a cover member (14) may be contacted, and it arrange | positions the thing with comparatively big physique among component members (IG ... H) close to the division member (12) side, thereby housing the electric circuit (40) When fixed to (10), it is possible to suppress an increase in the size of the electric circuit (40) protruding outside the housing (10).

  Further, the remaining constituent members (C, H) other than the constituent members arranged so as to be in contact with the first lid member (14) are arranged so as to be in contact with the dividing member (12). Through (12), it is possible to cool by exchanging heat with the suction fluid in the second suction space (S2) that is relatively low in temperature.

  Of course, among the remaining components (C, H), those that do not reach a high temperature during operation need not be brought into contact with the partition member (12). In such a case, since the second suction space (S2) is formed, the remaining constituent members (C, H) are heated by the heat of the refrigerant in the motor housing space (10a) that becomes relatively high in temperature. Can be suppressed.

  Furthermore, the shape of the second suction space (S2) formed between the partition member (12) and the second lid member (13a) can be easily changed by changing the shape of the second lid member (13a). can do. Therefore, the shape of the space formed between the partition member (12) and the second lid member (13a) is set to cool the remaining constituent members (C, H) or the remaining constituent members (C, H). ) Can be made to have an appropriate shape to suppress heating.

  That is, according to the invention described in this claim, in the electric compressor provided with the electric circuit (40), the size of the physique is reduced, and the constituent members (IG ... H) of the electric circuit (40) are sufficiently provided. It is possible to achieve both cooling.

  Here, the electric circuit arrangement space (10b) described in the claims is limited to a sealed space as long as the constituent members (IG... H) of the electric circuit (40) are arranged. Instead, it may be a space communicating with the outside air. That is, the electric circuit arrangement space (10b) may be defined as “the external space of the housing (10) in which the electric circuit (40) is arranged”.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is an axial sectional view of the compressor of a 1st embodiment. It is II-II sectional drawing of FIG. It is III-III sectional drawing of FIG. It is IV-IV sectional drawing of FIG. It is explanatory drawing for demonstrating the operating state of the compressor of 1st Embodiment. It is sectional drawing corresponding to FIG. 3 in 2nd Embodiment.

(First embodiment)
1st Embodiment of this invention is described using FIGS. The electric compressor 1 of the present embodiment is applied to a vapor compression refrigeration cycle that cools blown air that is blown into a vehicle interior by a vehicle air conditioner. Furthermore, the electric compressor 1 of the present embodiment fulfills a function of compressing and discharging a refrigerant that is a fluid in this refrigeration cycle.

  In the refrigeration cycle of the present embodiment, an HFC refrigerant (specifically, R134a) is adopted as the refrigerant, and a subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the critical pressure of the refrigerant is configured. . Of course, an HFO refrigerant (for example, R1234yf) or the like may be adopted as the refrigerant. Further, the refrigerant is mixed with refrigerating machine oil for lubricating the sliding portion in the electric compressor 1, and a part of the refrigerating machine oil circulates in the cycle together with the refrigerant.

  As shown in FIGS. 1 to 4, the electric compressor 1 includes a housing 10, a compression mechanism 20, an electric motor 30, an inverter 40, and the like. In addition, in FIG. 1, the site | part shown by the cross-section instruction | indication line II of FIGS.

  The compression mechanism 20 draws in refrigerant, compresses it, and discharges it. The electric motor 30 outputs a rotational driving force that drives the compression mechanism 20. The housing 10 forms an outer shell of the electric compressor 1 and houses the compression mechanism 20 and the electric motor 30 therein. The inverter 40 is an electric circuit that is disposed outside the housing 10 and supplies electric power to the electric motor 30.

  More specifically, the housing 10 is configured by combining a plurality of metal members such as the main housing 11, the sub-housing 12, the shaft forming member 13, and the like, and a sealed container structure that forms a substantially cylindrical space therein. belongs to.

  The main housing 11 is formed in a bottomed cylindrical shape (cup shape), and forms a motor accommodating space 10a for accommodating the compression mechanism 20, the electric motor 30 and the like therein. As shown in FIG. 1, a discharge port 11 a that discharges the high-pressure refrigerant pressurized by the compression mechanism 20 to the outside of the housing 10 is formed on the cylindrical side surface of the main housing 11. The discharge port 11a is connected to the refrigerant inlet side of a condenser that radiates high-pressure refrigerant in the refrigeration cycle.

  The sub-housing 12 is formed in a substantially disc shape (substantially cylindrical shape) and is disposed so as to close the opening of the main housing 11. Further, at least a part of the surface of the sub housing 12 opposite to the main housing 11 side constitutes an attachment surface 12b to which the constituent members of the inverter 40 are attached.

  Therefore, the sub housing 12, the motor housing space 10a, and the electric circuit arrangement space 10b in which the constituent members of the inverter 40 are arranged are partitioned. The electric circuit arrangement space 10b is a space formed between the sub housing 12 and a cover 40a described later. This space does not necessarily need to be a sealed space, but may be an external space of the housing 10 communicating with the outside air.

  As shown in FIGS. 1 and 2, a suction port 12 a for sucking low-pressure refrigerant from the outside of the housing 10 is formed on the outer peripheral side surface of the sub-housing 12. This suction port 12a is connected to the refrigerant outlet side of the evaporator that evaporates the low-pressure refrigerant in the refrigeration cycle. Further, a cylindrical step 12 c that protrudes toward the inverter 40 is formed on the mounting surface 12 b of the sub-housing 12.

  The low-pressure refrigerant sucked into the compression mechanism 20 from the suction port 12a is caused to flow into the sub-housing 12 and inside the step portion 12c positioned closer to the electric circuit arrangement space 10b than the motor housing space 10a. A first suction space S1 is formed.

  The open end of the stepped portion 12c is closed by the lid member 14. The lid member 14 includes a flat lid portion 14a and fins 14b that protrude from the lid portion 14a into the first suction space S1. Moreover, the surface on the opposite side of the surface in which the fin 14b was formed among the cover parts 14a comprises the attachment surface 14c to which the structural member of the inverter 40 is attached.

  As shown in FIG. 1, the shaft forming member 13 has a plate-like flat plate portion 13a and a substantially cylindrical shaft portion 13b, and is disposed in the motor housing space 10a. Further, the flat plate portion 13 a of the shaft forming member 13 is attached to the sub housing 12. As shown in FIGS. 1 and 3, a concave portion 13 c that is recessed toward the shaft portion 13 b is formed on the surface of the flat plate portion 13 a on the sub-housing 12 side.

  As a result, a second suction space S <b> 2 is formed between the sub-housing 12 and the flat plate portion 13 a of the shaft forming member 13 and into which the low-pressure refrigerant (suction fluid) sucked into the compression mechanism 20 from the suction port 12 a flows. Yes.

  Further, the second suction space S2 and the suction port 13d side of the compression mechanism 20 are communicated with each other inside the shaft portion 13b of the shaft forming member 13, so that the second suction space S2 is directed to the suction port 13d side of the compression mechanism 20. A communication path 13e that guides the low-pressure refrigerant is formed. Inside the sub-housing 12, an intake refrigerant communication path (intake fluid communication path) X that connects the first suction space S1 and the second suction space S2 is formed.

  Further, since the step portion 12c is formed in the sub housing 12, as shown in FIG. 1, when viewed from the direction perpendicular to the rotation axis of the electric motor 30, the mounting surface of the lid member 14 and the shaft forming member The mounting surfaces of the 13 flat plate portions 13a are displaced in the axial direction of the rotating shaft, and are formed in a shape having a step.

  As is clear from the above description, in the present embodiment, the partition member described in the claims is constituted by the sub-housing 12, and the first lid member 14 described in the claims is formed by the lid member 14. The 2nd cover member comprised and described in the claim by the flat plate part 13a of the shaft formation member is comprised. Of course, the sub-housing 12 as the partition member and the lid member 14 as the first lid member may be integrally formed as a single member.

  In the present embodiment, the sub-housing 12 and the lid member 14 are made of a metal (specifically, an aluminum alloy) having excellent heat transfer properties. Thereby, heat transfer between the constituent members of the inverter 40 attached to the attachment surfaces 12b and 14c of the sub housing 12 and the lid member 14 and the low-pressure refrigerant in the first and second suction spaces S1 and S2 is possible. It has become.

  Further, the fins 14b of the lid member 14 promote heat exchange between the constituent members of the inverter 40 disposed so as to contact the mounting surface 14c of the lid portion 14a of the lid member 14 and the low-pressure refrigerant in the first suction space S1. It serves as a heat exchange promoting member.

  Further, the suction port 12a of the present embodiment communicates with the first suction space S1 formed in the stepped portion 12c of the suction space. The first suction space S1 communicates with the second suction space S2 formed between the sub housing 12 and the shaft forming member 13 via the suction refrigerant communication path X.

  Therefore, the low-pressure refrigerant that has flowed into the housing 10 from the suction port 12a enters the housing 10 of the present embodiment into the first suction space S1, the suction refrigerant communication path X, the second suction space S2, and the shaft portion 13b. Fluid passage P1 flowing in the order of the communication path 13e → the suction port 13d of the compression mechanism 20 (thick solid line arrow P11 in FIG. 2 → thick solid line arrow P12 in FIG. 1 → thick solid line arrow P13 in FIG. 3 → thick solid line arrow in FIG. 1) A refrigerant flow path (flowing refrigerant) is formed in the order of P14.

  A guide member 13f that changes the flow direction of the low-pressure refrigerant that has flowed from the first suction space S1 into the second suction space S2 is disposed inside the recess 13c of the flat plate portion 13a. In the present embodiment, as shown in FIG. 3, the guide member 13 f causes the low-pressure refrigerant to flow around the axis of the shaft portion 13 b along the inner peripheral side surface of the main housing 11.

  For this reason, the second suction space S2 of the present embodiment is formed in a substantially semicircular shape extending in the radial direction when viewed from the axial direction of the shaft portion 13b, and is halved in the radial sectional area of the housing 10. It is formed so as to occupy an area of about 1.

  Next, the electric motor 30 has a stator 31 as a stator. The stator 31 includes a stator core 31 a made of a magnetic material, and a stator coil 31 b wound around the stator core 31 a, and is fixed to the inner peripheral surface of the cylindrical side surface of the main housing 11.

  When electric power is supplied from the inverter 40 to the stator coil 31b, a rotating magnetic field that rotates the cylinder rotor 21a disposed on the inner peripheral side of the stator coil 31b is generated. As shown in FIG. 4, the cylinder rotor 21 a is a metal cylindrical member that includes a plurality (eight in this embodiment) of permanent magnets 32, and serves as a rotor of the electric motor 30. While fulfilling a function, it constitutes a part of the cylinder 21 of the compression mechanism 20.

  That is, in the compressor 1 of the present embodiment, the rotor of the electric motor 30 and a part of the cylinder 21 of the compression mechanism 20 (specifically, the cylinder rotor 21a constituting the cylindrical member) are integrally configured. Yes. Of course, the rotor of the electric motor 30 and the cylinder 21 of the compression mechanism 20 may be configured as separate members and integrated by means such as press-fitting.

  Next, the compression mechanism 20 will be described. The compression mechanism 20 of the present embodiment is a cylinder rotation type compression that rotates a cylinder 21 that is a bottomed cylindrical member having a compression chamber V formed therein around a shaft portion 13b that is a central axis fixed to the housing 10. It is configured as a mechanism. Specifically, the compression mechanism 20 includes an inner rotor 22, a vane 23, and the like in addition to the cylinder 21 and the shaft portion 13b.

  The inner rotor 22 is a columnar member that is accommodated in the cylinder 21 and extends in the axial direction of the rotation shaft of the cylinder 21. The vane 23 is a partition member that is disposed inside the cylinder 21 and divides the compression chamber V. Moreover, the shaft part 13b supports the cylinder 21 and the inner rotor 22 rotatably.

  That is, in this embodiment, a part of the compression mechanism 20 (specifically, the shaft portion 13b) is integrally formed with the shaft forming member 13 (housing 10). Of course, the flat plate portion 13a and the shaft portion 13b of the shaft forming member 13 may be configured as separate members and integrated by means such as press-fitting.

  The cylinder 21 includes a cylinder rotor 21a that is the above-described cylindrical member, and first and second side plates 21b and 21c that are closing members that close the axial ends of the cylinder rotor 21a. In the present embodiment, the closing member disposed on the bottom surface side of the main housing 11 is referred to as a first side plate 21b, and the closing member disposed on the sub housing 12 side is referred to as a second side plate 21c.

  The first and second side plates 21b and 21c each have a disc-shaped portion that extends in a direction substantially perpendicular to the rotation axis of the cylinder 21, and a boss portion that is disposed at the center of the disc-shaped portion and projects in the axial direction. Have. Furthermore, a through-hole penetrating the front and back of the first and second side plates 21b and 21c is formed in the boss portion.

  A bearing mechanism (not shown) is disposed in each of these through holes, and the cylinder 21 is rotatably supported with respect to the shaft portion 13b by inserting the bearing mechanism into the shaft portion 13b. Further, the distal end portion of the shaft portion 13 b is fixed to the bottom surface of the main housing 11. Therefore, the shaft portion 13 b does not rotate with respect to the housing 10.

  As described above, the shaft portion 13b is formed in a substantially cylindrical shape, and an eccentric portion 13g that is eccentric with respect to the rotation center C1 of the cylinder 21 is provided at the center portion in the axial direction. The inner rotor 22 is rotatably supported by the eccentric portion 13g via a bearing mechanism. Therefore, the rotation center C2 of the inner rotor 22 is eccentric with respect to the rotation center C1 of the cylinder 21, as shown in FIG.

  The suction port 13d of the compression mechanism 20 formed in the shaft portion 13b extends in the radial direction of the shaft portion 13b and is formed to communicate the communication path 13e and the outer peripheral side of the eccentric portion 13g. Further, a plurality (two in this embodiment) of inlets 13d are formed.

  The inner rotor 22 is formed in a substantially cylindrical shape, and the axial length of the inner rotor 22 is the axial length of the eccentric portion 13g of the shaft portion 13b and the axis of the substantially cylindrical space formed inside the cylinder 21. It is formed in a dimension equivalent to the direction length. The outer diameter of the inner rotor 22 is smaller than the inner diameter of the cylindrical space formed inside the cylinder 21.

  That is, when the outer diameter of the inner rotor 22 is viewed from the axial direction of the rotating shaft of the cylinder 21, as shown in FIG. 4, the outer peripheral wall surface of the inner rotor 22 and the inner peripheral wall surface of the cylinder 21 (specifically, the cylinder The inner circumferential wall of the rotor 21a is set to come into contact at one contact point C3.

  A groove 22a that is recessed toward the inner periphery over the entire area in the axial direction is formed on the outer peripheral wall surface of the inner rotor 22, and a vane 23 is slidably fitted in the groove 22a. Further, an inner rotor side suction hole 22b that connects the inner peripheral side and the outer peripheral side is formed on the cylindrical side surface of the inner rotor 22.

  The vane 23 is formed of a plate-like member, and the axial length of the vane 23 is approximately the same as the axial length of the inner rotor 22. Further, a hinge portion 23a is formed on the outer peripheral side end portion of the vane 23, and this hinge portion 23a is swingably supported on the inner peripheral wall surface of the cylinder rotor 21a.

  Therefore, in the compression mechanism 20 of the present embodiment, the compression chamber V is formed by the space surrounded by the inner peripheral wall surface of the cylinder 21, the outer peripheral wall surface of the inner rotor 22, and the plate surface of the vane 23. The high-pressure refrigerant compressed in the compression chamber V flows into the internal space of the housing 10 from the first and second discharge ports 21d and 21e formed in the first and second side plates 21b and 21c, respectively. It discharges from the discharge port 11a formed in this.

  The first and second discharge ports 21d and 21e are arranged so as to overlap each other when viewed from the axial direction of the shaft portion 13b. Further, the refrigerant flowing out from the first and second discharge ports 21d and 21e to the internal space of the housing 10 through the first and second discharge ports 21d and 21e is respectively supplied to the first and second side plates 21b and 21c. Thus, first and second discharge valves 25a and 25b made of reed valves that suppress backflow to the compression chamber V are disposed.

  Here, since the compression mechanism 20 of this embodiment is configured as a cylinder rotation type compression mechanism, as the cylinder 21 rotates, the positions of the first and second discharge ports 21d and 21e also move around the shaft portion 13b. Displace. Further, in the cylinder rotation type compression mechanism, when the predetermined rotation angle is reached, the refrigerant in the compression chamber V is increased in pressure, and the first and second discharge valves 25a and 25b are opened.

  Therefore, in the present embodiment, when viewed from the axial direction of the shaft portion 13b, the first and second discharge ports 21d and 21e are within a range where they overlap with at least one of the first suction space S1 and the second suction space S2. The compression mechanism 20 is arranged so that the second discharge valve 25b closes the second discharge port 21e.

  In other words, in the compression mechanism 20 of the present embodiment, when viewed from the axial direction of the shaft portion 13b, at least the second discharge port 21e formed in the second side plate 21c has the first suction space S1 and the second suction space. The second discharge valve 25b is disposed so as to open the second discharge port 21e when displaced to a range where it does not overlap with S2.

  Next, the inverter 40 includes a semiconductor power element (IGBT) IG that outputs electric power to the electric motor 30, a control board that controls the operation of the semiconductor power element IG, a capacitor C for attenuating electrical noise, a coil H, It has components such as a sealed terminal (hermetic seal terminal) HC that forms an electrical connection with the electric motor 30.

  Among these components, the semiconductor power element IG, the capacitor C, the coil H, and the like are accompanied by heat generation because electrical loss occurs during operation. Therefore, in this embodiment, the semiconductor power element IG and the like are attached so as to contact the attachment surface 14c of the lid member 14, and the capacitor C, the coil H, and the like are attached so as to contact the attachment surface 12b of the sub housing 12.

  On the other hand, since the sealing terminal HC does not generate a large amount of heat during operation, when viewed from the axial direction of the shaft portion 13b of the mounting surface 12b of the sub-housing 12, the first suction space S1 and the second suction space. It arrange | positions in the range which does not superpose | polymerize with S2. That is, the second discharge valve 25b described above is disposed so as to open the second discharge port 21e when displaced to a position where it overlaps with the sealing terminal HC when viewed from the axial direction of the shaft portion 13b.

  Further, as shown in FIG. 1, a metal cover 40 a that covers and protects the constituent members constituting the inverter 40 from the outer peripheral side is attached to the housing 10. As described above, the electric circuit arrangement space 10b is formed inside the cover 40a.

  Next, operation | movement of the compressor 1 of this embodiment is demonstrated using FIG. FIG. 5 shows the change of the compression chamber V accompanying the rotation of the cylinder 21. The compression chamber V shown in FIG. 5 schematically shows the compression chamber V in the same cross section as FIG. .

  Further, in FIG. 5, in order to clarify the operation mode of the compressor 1, the change in the compression chamber V while the cylinder 21 rotates twice, that is, while the rotation angle θ of the cylinder 21 changes from 0 ° to 720 °. Is shown. Further, in FIG. 5, the rotation directions of the cylinder 21 and the inner rotor 22 are indicated by thick solid arrows.

  First, when the rotation angle θ is 0 °, the contact point C3 and the hinge part 23a side of the vane 23 coincide with each other, and almost the entire area of the vane 23 is accommodated in the groove part 22a of the inner rotor 22. . Further, at the rotation angle θ = 0 °, the state immediately before the communication between the inner rotor side suction hole 22b and the compression chamber V is cut off, and the volume of the compression chamber V indicated by the point hatching is the maximum volume. .

  When the rotation angle θ increases, the hinge portion 23a of the vane 23 moves away from the contact point C3, and the inner rotor 22 rotates together with the vane 23. As a result, communication between the inner rotor side suction hole 22b and the compression chamber V indicated by point hatching is blocked. Further, as shown in FIG. 5, as the rotation angle θ increases from 90 ° → 180 ° → 270 °, the volume of the compression chamber V indicated by the point hatching is reduced.

  As a result, the refrigerant pressure in the compression chamber V rises, and the refrigerant pressure in the compression chamber V is determined according to the refrigerant pressure in the internal space of the housing 10. The valve opening pressures of the first and second discharge valves 25 a and 25 b are determined. The first and second discharge valves 25a and 25b open, and the refrigerant in the compression chamber V flows into the internal space of the housing 10. The high-pressure refrigerant that has flowed into the internal space of the housing 10 is discharged from the discharge port 11 a of the housing 10.

  When the rotation angle θ reaches 360 °, the volume of the compression chamber V that has been in the compression process becomes 0, and the state is the same as when the rotation angle θ is 0 °.

  Subsequently, as the rotation angle θ increases from 360 °, the volume of the compression chamber V indicated by point hatching communicating with the inner rotor side suction hole 22b increases. Further, as the rotation angle θ increases in the order of 450 ° → 540 ° → 630 °, the volume of the compression chamber V indicated by point hatching gradually increases.

  As a result, the low-pressure refrigerant sucked from the suction port 12a of the housing 10 is sucked into the compression chamber V indicated by point hatching, and when the rotation angle θ reaches 720 °, the compression chamber V that has been in the suction process has the maximum volume. Become.

  In FIG. 5, the change in the compression chamber V while the rotation angle θ changes from 0 ° to 720 ° is described in order to clearly explain the operation mode of the compressor 1 of the present embodiment. Is the refrigerant compression process explained when the rotation angle θ changes from 0 ° to 360 ° and the refrigerant suction process explained when the rotation angle θ changes from 360 ° to 720 °. At the same time.

  As described above, in the compressor 1 of the present embodiment, the refrigerant (fluid) can be sucked, compressed, and discharged in the refrigeration cycle.

  Furthermore, according to the compressor 1 of the present embodiment, the sub-housing 12 and the lid member 14 are formed of a metal having excellent heat conductivity, so that the inverter is attached to the attachment surfaces 12b and 14c of the sub-housing 12 and the lid member 14. Heat transfer between the 40 constituent members IG, C, H and the low-pressure refrigerant in the first and second suction spaces S1, S2 is enabled.

  Therefore, the constituent members IG, C, and H of the inverter 40 attached to the attachment surfaces 12b and 14c can be cooled by the low-pressure refrigerant in the first and second suction spaces S1 and S2 that have a relatively low temperature.

  That is, heat exchange is performed between the semiconductor power element IG and the like of the inverter 40 disposed so as to be in contact with the mounting surface 14c of the lid member 14 and the suction fluid in the relatively low temperature first suction space S1 through the lid member 14. Thus, the semiconductor power element IG and the like can be cooled. Further, the capacitor C, the coil H, etc. of the inverter 40 arranged so as to contact the mounting surface 12b of the sub housing 12 and the suction fluid in the relatively low temperature second suction space S2 are heated via the sub housing 12. The capacitor C and the coil H can be cooled by replacing them.

  At this time, since the sub-housing 12 is formed in a shape having a step, the semiconductor power element IG having a relatively small physique among the constituent members is arranged so as to contact the mounting surface 14c of the lid member 14, and the constituent members are arranged. The capacitor C and the coil H, which are relatively large in size, are arranged so as to be in contact with the mounting surface 12b of the sub-housing 12, thereby suppressing the expansion of the dimension that protrudes outside the housing 10 as a whole of the inverter 40. it can.

  Further, the shape of the second suction space S2 formed between the sub housing 12 and the flat plate portion 13a of the shaft forming member 13 changes the shapes of the flat plate portion 13a of the shaft forming member 13 and the concave portion 13c of the flat plate portion 13a. Can be easily changed. Therefore, the shape of the second suction space S2 can be set to a shape necessary for sufficiently cooling the constituent members C and H attached to the attachment surface 12b of the sub housing 12.

  Specifically, the flow direction of the fluid from the suction port 12a toward the suction port 13d of the compression mechanism 20 is changed by disposing the guide member 13f inside the concave portion 13c of the flat plate portion 13a. Thus, when viewed from the axial direction of the shaft portion 13b, the second suction space S2 has a substantially semicircular shape that expands in the radial direction so that the plurality of capacitors C, coils H, and the like can be sufficiently cooled. 2 The range that can be cooled by the low-pressure refrigerant in the suction space S2 is expanded.

  That is, according to the compressor 1 of the present embodiment, in the electric compressor including the electric circuit (inverter 40), the physique is reduced in size, and the constituent members IG, C, and H of the electric circuit are sufficiently cooled. It is possible to achieve both.

Further, in the compressor 1 of the present embodiment, the low-pressure refrigerant sucked from the suction port 12a is caused to flow in the order of the first suction space S1, the suction refrigerant communication path X, the second suction space S2, and the suction port 13d of the compression mechanism 20. I have to. Therefore, the semiconductor power element IG having a relatively large calorific value is cooled by the low-pressure refrigerant in the first suction space S1, and the capacitor C and the coil H are cooled by the low-pressure refrigerant after the semiconductor power element IG in the second suction space S2 is cooled. Can be cooled.

  Moreover, in the compressor 1 of this embodiment, since the cylinder rotation type compression mechanism is employ | adopted as the compression mechanism 20, a compression mechanism can be arrange | positioned at the inner peripheral side of the electric motor 30, and the compressor 1 is further improved. The overall size can be reduced.

  Further, in the cylinder rotation type compression mechanism, since the shaft portion 13b is fixed to the housing 10, the rotation speed during normal operation of the cylinder 21 of the compression mechanism 20 is set to a relatively high rotation speed (for example, 5000 rpm or more). However, the cylinder 21 can be stably rotated. Therefore, the maximum volume of the compression chamber V can be set to a relatively small volume, and the size of the compressor 1 as a whole can be further effectively reduced.

  Further, in the compression mechanism 20 of the present embodiment, when the first and second discharge ports 21d and 21e formed in the first and second side plates 21b and 21c, respectively, are viewed from the axial direction of the shaft portion 13b, They are arranged to polymerize with each other. Therefore, the refrigerant can be discharged from both the discharge ports 21d and 21e at the same timing.

  Thereby, the pressure in the internal space of the housing 10 can be made uniform, and the cylinder 21 can be prevented from receiving an unnecessary eccentric load due to the refrigerant pressure distribution in the internal space of the housing 10.

  Further, in the compressor 1 of the present embodiment, when viewed from the axial direction of the shaft portion 13b, at least the second discharge port 21e formed in the second side plate is connected to the first suction space S1 and the second suction space S2. In the overlapping range, the compression mechanism 20 is arranged so that the second discharge valve 25b closes the second discharge port 21e.

  Therefore, it is possible to prevent the low-pressure refrigerant in the first and second suction spaces S1 and S2 from being heated by the high-temperature and high-pressure refrigerant discharged from the second discharge port 21e, and the components IG, C, and H can be efficiently used. Cooling can be performed.

(Second Embodiment)
This embodiment demonstrates the example which changed the shape of the guide member 13f of the shaft formation member 13 with respect to 1st Embodiment, as shown in FIG. FIG. 6 is a cross-sectional view corresponding to FIG. 3 of the first embodiment, and the same or equivalent parts as in the first embodiment are denoted by the same reference numerals. In the present embodiment, the fluid flow path P1 described in the first embodiment is referred to as a first fluid flow path P1 for clarity of explanation.

  Specifically, in the present embodiment, by changing the shape of the guide member 13f of the shaft forming member 13, in addition to the first fluid flow path P1, the first suction space S1 → the suction refrigerant communication path X → the bypass path. 13h → second fluid flow path P2 flowing in the order of the communication passage 13e in the shaft portion 13b → the suction port 13d of the compression mechanism 20 (thick solid arrow P11 in FIG. 2 → thick solid arrow P12 in FIG. 1 → thick broken arrow in FIG. 6) A refrigerant flow path is formed in which the refrigerant flows in the order of P23 → thick solid arrow P14 in FIG.

  That is, the second fluid flow path P2 is a fluid passage through which the low-pressure refrigerant flows to the suction port 13d side of the compression mechanism 20 while bypassing the second suction space S2. Other configurations are the same as those of the first embodiment. Therefore, also in the compressor 1 of this embodiment, the size reduction effect of the compressor 1 similar to 1st Embodiment can be acquired.

  Further, in the present embodiment, since the second fluid flow path P2 is formed, the flow rate of the low-pressure refrigerant flowing into the second suction space S2 is reduced compared to the case where the second fluid flow path P2 is not formed. Can be made. Thereby, while being able to suppress that the structural members C and H of the inverter 40 are unnecessarily cooled, it is possible to suppress an increase in density due to an unnecessary temperature increase of the refrigerant sucked into the compression mechanism 20, The volumetric efficiency of the compressor 1 can be improved.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows without departing from the spirit of the present invention.

  (1) In the above-described embodiment, the example in which the electric compressor 1 according to the present invention is applied to the refrigeration cycle (vehicle refrigeration cycle apparatus) of the vehicle air conditioner has been described. However, the electric compressor 1 according to the present invention is described. The application of is not limited to this. That is, the electric compressor 1 according to the present invention can be applied to a wide range of uses as a compressor that compresses various fluids.

  (2) In the above-described embodiment, the example in which the constituent members IG, C, and H of the inverter 40 are attached to the attachment surface 12b on the sub housing 12 side and the attachment surface 14c on the lid member 14 side has been described. You may attach not only to the surface 12b and 13c but the side surface of the level | step-difference part 12c.

  (3) In the second embodiment described above, the second fluid flow path P2 has been described in which the low-pressure refrigerant sucked from the suction port 12a flows around the second suction space S2, but this is the second fluid flow path P2. It is not limited to. That is, the second fluid flow path P2 may be formed so that the low-pressure refrigerant sucked from the suction port 12a flows around the first suction space S1, or the first suction space S1 and the second suction space. You may form so that both of S2 may be detoured and flowed.

  (4) In the above-described embodiment, the example in which the cylinder rotation type compression mechanism is employed as the compression mechanism 20 has been described. However, the configuration of the compression mechanism 20 is not limited thereto. For example, as the compression mechanism 20, a scroll type compression mechanism, a rolling piston type compression mechanism, a vane type compression mechanism, or the like may be employed.

  Moreover, when employ | adopting a cylinder rotation type compression mechanism, the quantity of the vane 23 and the position of the hinge part 23a may be changed with respect to the compression mechanism 20 of the above-mentioned embodiment. Further, this is a cylinder rotary type compression mechanism that eliminates the hinge part of the vane and fixes the inner rotor to the shaft or the housing and rotates the cylinder with respect to the inner rotor to displace the vane to change the volume of the compression chamber. May be.

  (5) In the above-described embodiment, the example in which the first and second discharge ports 21d and 21e are provided in both the first and second side plates 21b and 21c has been described, but either one may be eliminated. . When the first discharge port 21d on the first side plate 21b side is abolished, the second discharge port 21e has the first and second portions when viewed from the axial direction of the shaft portion 13b, as in the first embodiment. The compression mechanism 20 may be disposed so that the second discharge valve 25b closes the second discharge port 21e in a range where it overlaps with the suction spaces S1 and S2.

  (6) In the above-described embodiment, not only the semiconductor power element IG but also the capacitor C and the coil H have been described as generating heat during operation. However, the capacitor C and the coil H do not generate large heat during operation. There are also things. Furthermore, the constituent members of the inverter 40 that do not generate a large amount of heat during operation do not necessarily have to be attached so as to contact the attachment surface 12b of the sub-housing 12.

  In such a case, since the second suction space S2 is formed, the constituent members of the inverter 40 that do not generate heat during operation are heated by the heat of the refrigerant in the motor housing space 10a that is relatively hot. Can be suppressed.

DESCRIPTION OF SYMBOLS 10 Housing 10a Motor accommodation space 10b Electric circuit arrangement | positioning space 12 Subhousing 13a Flat plate part 14 of shaft formation member Closure member 20 Compression mechanism 30 Electric motor 40 Inverter S1, S2 1st, 2nd suction space IG, C, H (Semiconductor power elements, capacitors, coils)

Claims (8)

A compression mechanism (20) for compressing and discharging the fluid;
An electric motor (30) for outputting a rotational driving force for driving the compression mechanism (20);
A housing (10) that houses the compression mechanism (20) and the electric motor (30);
An electric circuit (40) fixed to the housing (10) and supplying electric power to the electric motor (30),
The housing (10) is a partition member (12) that partitions a motor housing space (10a) in which the electric motor (30) is housed and an electric circuit placement space (10b) in which the electric circuit (40) is placed. Have
On the electric circuit arrangement space (10b) side of the partition member (12), there is an attachment surface (12b) to which at least a part of the constituent members (IG, C, H) constituting the electric circuit (40) is attached. Formed,
On the mounting surface (12b), a stepped portion (12c) protruding toward the electric circuit (40) is formed,
A first suction space (S1) into which the suction fluid sucked into the compression mechanism (20) flows is formed inside the step portion (12c) and on the electric circuit arrangement space (10b) side. ,
The step portion (12c) includes the structural members (IG, C, H) that close the first suction space (S1) from the electric circuit arrangement space (10b) side and constitute the electric circuit (40). A first lid member (14) is attached, at least a part of which is disposed in contact;
The front Symbol partitioning member (12), the said forming the second suction space for flowing the inlet fluid (S2) between said partition member is disposed in the motor housing space (10a) within the (12) 2 A lid member (13a) is attached,
The second suction space (S2) communicates with the suction port (13d) side of the compression mechanism (20),
Electric said inside the compartment member (12) is characterized by the Tei Rukoto sucked fluid communication path (X) is formed first communicating with the suction space (S1) and second suction space (S2) Compressor. The electric compression according to claim 1, wherein at least a part of the constituent members (C, H) constituting the electric circuit (40) is attached so as to be in contact with the attachment surface (12b). Machine. The second suction space (S2) includes the electric circuit (40) attached so as to come into contact with the attachment surface (12b) when viewed from a direction perpendicular to the rotation axis of the electric motor (30). The electric compressor according to claim 2, wherein the electric compressor is formed so as to be polymerized with at least a part of the constituent members (C, H). Inside the housing (10), the suction fluid flows into the suction port of the first suction space (S1) → the suction fluid communication path (X) → the second suction space (S2) → the compression mechanism (20). The electric compressor according to any one of claims 1 to 3 , wherein a fluid flow path (P1) that flows in the order of (13d) is formed. Inside the housing (10), the suction fluid flows into the suction port of the first suction space (S1) → the suction fluid communication path (X) → the second suction space (S2) → the compression mechanism (20). the first fluid flow path to flow in the order of (13d) (P1), as well as the suction fluid, to bypass at least a portion of the pre-Symbol second suction space (S2) with respect to the first fluid flow path (P1) The electric compressor according to any one of claims 1 to 3, wherein a second fluid flow path (P2) that flows to the suction port (13d) is formed. The housing (10) is formed with a suction port (12a) for sucking fluid that is sucked into the compression mechanism (20) from the outside.
Inside the second suction space (S2), a guide member (13f) that changes the flow direction of the fluid from the suction port (12a) toward the suction port (13d) of the compression mechanism (20) is disposed. electric compressor according to any one of claims 1 to 5, characterized in that there. The compression mechanism is a cylinder rotation type compression mechanism (20) that rotates a bottomed cylindrical member (21) in which a compression chamber (V) for compressing a fluid is formed around the rotation axis. The electric compressor according to any one of claims 1 to 6 . The bottomed cylindrical member (21) is provided with a discharge port (21e) for discharging the high-pressure fluid compressed in the compression chamber (V),
The cylinder rotary compression mechanism (20) has a discharge valve (25b) for opening and closing the discharge port (21e),
When the discharge valve (25b) is viewed from the axial direction of the central axis, the discharge port (21e) overlaps with at least a part of the first suction space (S1) and the second suction space (S2). The electric compressor according to claim 7 , wherein the discharge port (21 e) is closed within a range to be performed.

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