JP2019198175A - Cooling system of power conversion device - Google Patents

Abstract

To provide a cooling system of a power conversion device capable of downsizing and reducing cost.SOLUTION: A cooling system of an inverter (power conversion device) INV connected to a motor M has first to third oil passages 101, 102, and 103 which drip oil as insulation coolant cycled inside the motor M from an upper part of a second bus bar 72 and a third bus bar 73 wired within an inverter housing 40 to each of the bus bars 72 and 73, and recover the oil from the inverter housing 40 to a motor housing 50.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a cooling system for a power conversion device.

2. Description of the Related Art Conventionally, a power converter that cools a bus bar that is a heat generating portion has been proposed (see, for example, Patent Document 1).
Patent Document 1 includes a cooling wall in which a part of the cooling water flowing through the cooling water circulation part is circulated inside the element housing part, and along this cooling wall, a bus bar connected to the reactor is arranged, The heat of the bus bar is dissipated by the cooling wall of the metal case.

JP-A-2015-177585

  In the above prior art, since the bus bar is pressed against the water jacket of the metal case to cool it, an insulating material is required between the bus bar and the water jacket, and an extra cost is required for the insulating material. In addition, since the structure between the reactor and the smoothing capacitor is thermally shut off by the cooling wall, a space is required in the power converter, and the bus bar also bypasses the cooling wall, and In order to follow the cooling wall, a space for the cooling wall and a length of the bus bar are required.

  The present invention has been made paying attention to the above problem, and an object of the present invention is to provide a cooling system for a power conversion device that can be reduced in size and cost.

In order to achieve the above-described object, a cooling system for a power conversion device of the present disclosure includes:
Insulating refrigerant flow inside the motor can be dropped onto the bus bar from above the bus bar routed inside the casing of the power conversion device, and can be recovered from the inside of the casing to the motor housing. A cooling system for a power conversion device including a road is provided.

  In the cooling system for the power conversion device of the present disclosure, it is possible to reduce the size and the cost.

1 is an overall view showing an outline of an entire cooling system A of a power conversion device according to a first embodiment. It is structure explanatory drawing which shows the outline of the cooling structure in the inverter INV of the cooling system A of the power converter device of Embodiment 1. FIG. It is a perspective view in the state where a part of water jacket 42 showing water jacket inner oil passage 30a provided in water jacket 42 of cooling system A of the power converter of Embodiment 1 was cut. It is a perspective view which shows the principal part of the cooling system A of the power converter device of Embodiment 1. FIG. It is sectional drawing which shows the 1st oil flow path 101 which cools the 2nd bus bar 72 in the cooling system A of the power converter device of Embodiment 1, and shows the cross section in the position of the S4B-S4B line | wire of FIG. 4A. FIG. 4B also serves as a cross-sectional view showing the second oil passage 102. 6 is a cross-sectional view showing a third oil passage 103 that cools the third bus bar 73 in the cooling system A of the power conversion device according to Embodiment 1. FIG. It is a perspective view which shows the bus bar used for the cooling system of the power converter device of Embodiment 2. FIG. It is a perspective view which shows the other bus bar used for the cooling system of the power converter device of Embodiment 2. FIG. FIG. 6 is a cross-sectional view showing a first oil passage 101 that is a main part of a cooling system for a power conversion device according to a third embodiment. FIG. 6 also serves as a cross-sectional view showing the second oil passage 102. FIG. 10 is a perspective view showing second bus bars 272 and 272 and a flow path forming member 490 in the cooling system for the power conversion device according to the fourth embodiment. FIG. 7C is a cross-sectional view showing a first oil flow path 401 in the cooling system for the power conversion device according to the fourth embodiment, and shows a cross section at the position of line S7B-S7B in FIG. 7A. It is a perspective view which shows the 2nd bus bars 572 (a) and 572 (b) and the flow-path formation member 590 in the cooling system of the power converter device of Embodiment 5. FIG. It is sectional drawing which shows the 1st oil flow path 501 in the cooling system of the power converter device of Embodiment 5, and shows the cross section in the position of the S8BC-S8BC line | wire of FIG. 8A. FIG. 10 is a cross-sectional view showing a modification of the cooling system for the power conversion device according to the fifth embodiment. It is a perspective view which shows the 2nd bus bars 72 and 72 and the flow-path formation member 690 in the cooling system of the power converter device of Embodiment 6. FIG. 9C is a cross-sectional view showing a first oil flow path 601 in the cooling system for a power conversion device according to Embodiment 6, and shows a cross section at the position of line S9B-S9B in FIG. 9A. FIG. FIG. 38 is a perspective view showing second bus bars 72 (a) and 72 (b) and a flow path forming member 790 in the cooling system for the power conversion device according to the seventh embodiment. FIG. 10C is a cross-sectional view showing a first oil flow path 701 in the cooling system for the power conversion device according to the seventh embodiment, and shows a cross section taken along the line S10B-S10B in FIG. 10A. FIG. 29 is a perspective view showing second bus bars 872 (a) and 872 (b) and a flow path forming member 890 in the cooling system for the power conversion device according to the eighth embodiment. FIG. 18B is a cross-sectional view showing a first oil flow path 801 in the cooling system for the power conversion device according to the eighth embodiment, and shows a cross section taken along the line S11B-S11B in FIG. 11A.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
First, based on FIG. 1, the cooling system A (hereinafter simply referred to as the cooling system A) of the power conversion device according to the first embodiment will be described.

  This cooling system A cools an inverter (power converter) INV used for driving a motor M by using an oil oil used for lubricating and cooling the motor M as an insulating refrigerant, and includes a heat exchanger 10 and a pump. 20. A refrigerant circulation path 30 is provided.

  As the motor M and the inverter INV, for example, those mounted as a vehicle drive source can be used. The inverter INV is integrally provided on the upper side of the motor M.

  The refrigerant circulation path 30 is a flow path from the discharge section 21 of the pump 20 to the inverter INV and the motor M in this order, and then to the suction section 22 of the pump 20 through the heat exchanger 10. An oil supply port 31, an oil recovery port 32, and a discharge port 33 are provided in the middle of the refrigerant circulation path 30.

The oil supply port 31 is an opening that is provided in the inverter housing 40 (see FIG. 2) that forms the outline of the inverter INV, and supplies oil oil (see FIG. 2) to the inside of the inverter INV.
The oil recovery port 32 is an opening that is provided in the motor housing 50 that forms the outline of the motor M, and that recovers the oil oil supplied to the inside of the inverter INV to the inside of the motor M.
The discharge port 33 is an opening that is provided in the motor housing 50 and discharges oil oil inside the motor M to the heat exchanger 10 outside the motor M.

  The heat exchanger 10 exchanges heat of the oil oil with cooling water of the second cooling system B described later. In addition, as the heat exchanger 10, you may use what dissipates the heat of oil in air | atmosphere.

Further, the motor M and the inverter INV are provided with a second cooling system B using cooling water in parallel with the cooling system A of the first embodiment.
Since the second cooling system B is not intended to be the gist of the present disclosure, in brief, the second cooling system B includes the cooling water circulation paths 1 and 2. In these cooling water circulation paths 1 and 2, cooling water is circulated by a pump (not shown), and cooling of the inverter INV and the motor M and heat exchange (cooling) with oil in the heat exchanger 10 are performed.

(Cooling structure in inverter)
Next, a cooling structure in the inverter INV of the cooling system A will be described.
FIG. 2 is a structural explanatory diagram showing an outline of a cooling structure in the inverter INV of the cooling system A.

As described above, the inverter INV is integrally provided on the upper side of the motor M.
The inverter housing 40 that forms the outline of the inverter INV is provided so as to cover the upper surface of the motor housing 50 that forms the outline of the motor M, and an inverter accommodation space 41 is formed adjacent to the upper surface of the motor housing 50. .

The inverter INV includes a smoothing capacitor 61 and a power module 62.
A first bus bar 71 and a second bus bar 72 are connected to the smoothing capacitor 61. The first bus bar 71 connects a smoothing capacitor 61 and an external power source (not shown) as a PN terminal. The second bus bar 72 connects the smoothing capacitor 61 and the power module 62.
Further, the power module 62 is connected to a coil (not shown) of the motor M via the third bus bar 73. A current sensor 63 is provided in the middle of the third bus bar 73.

  A water jacket 42 is provided in a part of the inverter housing 40. The water jacket 42 is formed with water passages 1a and 1b that form a part of the cooling water circulation passage 1 described above. The smoothing capacitor 61 and the power module 62 are cooled by the water jacket 42.

  The inverter INV generates heat in the smoothing capacitor 61, the second bus bar 72, and the third bus bar 73 during operation, and the heat generation portions are referred to as heat generation portions 81, 82, 83. Note that a plurality of bus bars 71, 72, 73 are arranged in the horizontal direction.

The cooling system A of the first embodiment cools the second bus bar 72 and the third bus bar 73, that is, the heat generating parts 82 and 83.
The cooling system A has a structure in which the oil oil inside the motor M is pumped out and dropped from above the second bus bar 72 and the third bus bar 73, the bus bars 72 and 73 are cooled, and collected in the motor housing 50. ing.

  Therefore, as shown in FIG. 3, the water jacket 42 is formed with a water jacket internal oil passage 30 a that forms a part of the refrigerant circulation passage 30. The water jacket inner oil passage 30a is provided along one or both of the water passage 1a and the water passage 1b of the water jacket 42 in order to improve heat exchange with the cooling water of the water jacket 42.

  Returning to FIG. 2, the inverter INV includes a first oil passage 101 for cooling the second bus bar 72 and a cooling member for the third bus bar 73 between the oil passage 30 a in the water jacket and the motor housing 50. A second oil channel 102 and a third oil channel 103 are formed. Note that only one of the second oil passage 102 and the third oil passage 103 may be formed.

  As shown in FIG. 2, an oil supply port 31 a for dropping (supplying) oil oil to the second bus bar 72 is opened in the water jacket inner oil passage 30 a as shown in FIG. 2. Further, oil supply ports 31 b and 31 c for dropping (supplying) oil oil to the third bus bar 73 are opened above the third bus bar 73.

  The oil supply ports 31a, 31b, 31c shown in FIG. 2 correspond to the oil supply port 31 shown in FIG.

Oil recovery ports 32 a, 32 b, and 32 c for recovering oil oil dropped into the inverter housing space 41 inside the motor housing 50 are opened at the lower part of the inverter housing space 41 and at the upper part of the motor housing 50. ing. Each oil recovery port 32a, 32b, 32c is disposed substantially opposite to the oil supply port 31a, 31b, 31c in the vertical direction.
Note that the oil recovery ports 32a, 32b, and 32c shown in FIG. 2 correspond to the oil recovery port 32 shown in FIG. Further, when one of the second oil passage 102 and the third oil passage 103 is used, either one of the oil supply ports 31b and 31c and the oil recovery ports 32b and 32c corresponds to this. It is good.

(Structure of oil flow path)
Next, each oil flow path 101,102,103 as an insulating refrigerant flow path mentioned above is demonstrated.
First, the first oil flow path 101 that drops oil from the oil supply port 31a to the second bus bar 72 and collects it at the oil recovery port 32a will be described with reference to FIGS. 4A and 4B.

  FIG. 4A is a perspective view showing the housing 61a of the smoothing capacitor 61 and the two second bus bars 72 extending from the housing 61a to the power module 62 (see FIG. 2) (not shown) in the inverter INV.

  The two second bus bars 72, 72 are fitted with flow path forming members 90, 90, respectively. This flow path forming member 90 drops oil oil from the oil supply port 31a to the second bus bar 72 and collects it in the oil recovery port 32a of the motor housing 50 inside the inverter housing 40 as shown in FIG. 4B. 1 oil channel 101 is formed.

  The flow path forming member 90 is formed in a cylindrical shape extending vertically, and in order from the top, a cylindrical upper cylindrical portion 91, a square cylindrical bus bar mounting cylindrical portion 92, and a cylindrical lower cylindrical portion 93. And are integrally formed continuously. The flow path forming member 90 can be formed of, for example, a resin, and may be formed integrally with the housing 61a of the smoothing capacitor 61 or may be formed separately.

  An oil supply pipe 33 a that is continuously dropped from the water jacket internal oil passage 30 a of the water jacket 42 and includes the oil supply port 31 a is inserted into the upper cylindrical portion 91 of the flow path forming member 90.

  The bus bar mounting cylinder 92 has a rectangular cylindrical shape with four sides having dimensions larger than the diameters of the upper and lower cylinders 91 and 93, and has an upper wall 92a and a bottom wall 92b. . The upper cylindrical portion 91 and the lower cylindrical portion 93 are integrally and coaxially coupled to the upper wall 92a and the bottom wall 92b to form a first oil passage 101 that is continuous in the vertical direction.

  Further, the second bus bar 72 passes through the bus bar mounting cylinder portion 92 in the extending direction of the second bus bar 72 (the direction of the arrow ABE in FIG. 4A). And in the space part 94 formed in the inside of the bus bar mounting cylinder part 92, it is a space | interval in the up-down direction and the width direction (arrow ABW of FIG. 4B) of the 2nd bus bar 72 between the inner periphery and the 2nd bus bar 72. And an oil oil flow path is secured.

  In the second bus bar 72, a plurality of through holes 72 a penetrating in the vertical direction are opened in a portion disposed inside the bus bar mounting cylinder portion 92. Further, when the flow path forming member 90 is molded, the sealing performance between the second bus bar 72 and the bus bar mounting cylinder portion 92 can be secured by insert molding of the second bus bar 72.

  The lower cylindrical portion 93 is suspended from the bottom wall 92 b of the bus bar mounting cylindrical portion 92, and the lower end portion is inserted into the oil recovery port 32 a opened in the motor housing 50.

  Therefore, the oil supplied from the oil supply port 31a communicated with the water jacket internal oil passage 30a is secondly passed through the upper cylindrical portion 91 by the first oil passage 101 formed by the passage forming member 90. It is dropped on the bus bar 72. Then, it travels along the outer periphery of the second bus bar 72 and the through hole 72 a, drops downward from the second bus bar 72, passes through the lower cylindrical portion 93, and drops into the motor housing 50 from the oil recovery port 32 a.

Therefore, when the oil contacts with the second bus bar 72, the heat is exchanged with the second bus bar 72 to cool the heat generating portion 82 (see FIG. 2), and then the oil is collected in the motor housing 50.
A part of the oil inside the motor M collected in the motor housing 50 is sucked by the pump 20 and is radiated in the heat exchanger 10 on the way, and then supplied to the inverter INV. Therefore, the oil oil circulates between the inverter INV and the motor M as described above.

  Next, the second oil passage 102 and the third oil passage 103 formed at the position of the third bus bar 73 will be described. As described above, either one of the oil flow paths 102 and 103 is basically provided, but both may be provided.

  The second oil flow path 102 can be formed using a configuration similar to the structure shown in FIGS. 4A and 4B. The difference from the first oil flow path 101 is that, in FIG. 4A, the flow path forming member 90 is provided adjacent to the housing 61a of the smoothing capacitor 61. A forming member 90 is provided adjacent to the housing of the power module 62. As described above, the second oil flow path 102 is formed by using the flow path forming member 90 described above, and illustration and detailed description thereof are omitted.

Next, the 3rd oil flow path 103 is demonstrated based on FIG. 4C.
The third oil passage 103 differs from the first and second oil passages 101 and 102 in that the third bus bar 73 is bent downward inside the second passage forming member 190. This is a point that extends into the motor housing 50 along the third oil passage 103.

  The second flow path forming member 190 includes a cylindrical upper cylindrical portion 191, a square cylindrical bus bar mounting cylindrical portion 192, and a cylindrical lower cylindrical portion 193 that are integrated continuously from the top. Is formed. And the upper cylindrical part 191 is arrange | positioned in the downward direction substantially coaxially with the oil supply port 31c opened to the oil path 30a in the water jacket. Further, the lower cylindrical portion 193 is inserted into the oil recovery port 32 c opened in the motor housing 50.

  The third bus bar 73 penetrates from the outside to the inside of the bus bar mounting cylinder 192, is bent downward at the position of the bus bar mounting cylinder 192, and extends to the inside of the motor housing 50. The third bus bar 73 is also formed with a plurality of through holes 73a.

Accordingly, the oil oil supplied from the oil supply port 31 c communicated with the water jacket internal oil passage 30 a is dropped onto the third bus bar 73 through the upper cylindrical portion 191 of the flow path forming member 190. The oil oil is dropped through the third bus bar 73 or dropped from the third bus bar 73 and passes through the lower cylindrical portion 193 and is lowered into the motor housing 50.
Therefore, the oil oil is collected in the motor housing 50 after heat exchange with the third bus bar 73 to cool the heat generating portion 83 (see FIG. 2) at the time of contact with the third bus bar 73.

(Operation of Embodiment 1)
In the first embodiment, as shown in FIG. 1, the cooling water is circulated by the second cooling system B and the water jacket 42 shown in FIG. ) And the power module 62 are cooled.

  Here, the cooling by the second cooling system B will be described. The heat of the heat generating portion 81 in the smoothing condenser 61 is cooled by the water channel 1a of the water jacket 42, and is transmitted through the second bus bar 72 and the power module 62 to the water channel. Cooled by 1b.

Further, the heat of the heat generating portion 82 in the second bus bar 72 is cooled by the water channel 1 b of the water jacket 42 through the power module 62.
Further, the heat in the heat generating portion 83 of the third bus bar 73 is cooled from the third bus bar 73 through the power module 62 by the water channel 1 b of the water jacket 42.

Further, in the first embodiment, the first cooling system A cools the second bus bar 72 and the third bus bar 73 as the heat generating portions 82 and 83 shown in FIG.
That is, in the first cooling system A, oil oil, which is an insulating refrigerant, is dropped from the oil supply ports 31a, 31b, 31c formed in the water jacket 42 to the second bus bar 72 and the third bus bar 73, so that both bus bars. 72 and 73 are cooled.

The oil oil dropped on both bus bars 72 and 73 is recovered into the motor housing 50 from the oil recovery ports 32a, 32b, and 32c of the motor housing 50.
The oil oil is used for lubrication and cooling of the motor M. The oil oil is circulated in the motor M, and a part of the oil oil is circulated in the cooling system A to cool both the bus bars 72 and 73. Used for.

  Further, in the cooling system A, the heat exchanger 10 is provided in the refrigerant circulation path 30 that circulates the oil oil, and a water jacket internal oil path 30 a that passes through the water jacket 42 is provided in a part of the refrigerant circulation path 30. . For this reason, the oil oil before being dropped onto both bus bars 72 and 73 can be cooled by the heat exchanger 10 and the water jacket 42, and the cooling performance is higher than that when the oil oil inside the motor M is dropped as it is. Can be obtained.

(Effect of Embodiment 1)
(1) The cooling system A of the power conversion device according to the first embodiment is
A cooling system A of an inverter INV connected to a motor M,
An oil oil as an insulating refrigerant circulated inside the motor M;
Oil oil inside the motor M can be dropped onto the bus bars 72 and 73 from above the second bus bar 72 and the third bus bar 73 arranged in the inverter housing 40, and the motor M First to third oil flow paths 101, 102, 103 formed retrievably in the motor housing 50 forming the outer shell;
Is provided.
In this way, the oil oil having insulating properties is directly dropped onto the bus bars 72 and 73 to cool them, so that each bus bar 72 and 73 is compared with the case where the bus bars 72 and 73 are placed along the water jacket 42 and the like. The shapes of 72 and 73 can be simplified and downsized. In addition, an insulator that insulates each bus bar 72, 73 from the water jacket 42 or the like is not required, and the cost can be reduced.
In addition, since each bus bar 72, 73 is directly cooled by the oil oil as a refrigerant without interposing a solid (water jacket 42) with respect to the refrigerant as in the case where the bus bars 72, 73 are placed along the water jacket 42, indirect Cooling performance is also superior compared to solid heat propagation.

(2) The cooling system A of the power conversion device according to the first embodiment is
Each oil flow path 101-103 is provided with the water jacket internal oil path 30a formed in the inverter INV and formed through the water jacket 42 through which the cooling water is circulated.
Therefore, the cooling performance of the bus bars 72 and 73 can be improved by cooling the oil oil in the water jacket 42.

(3) The cooling system A of the power conversion device according to the first embodiment is
Oil supply ports 31 a, 31 b, and 31 c are provided in the water jacket internal oil passage 30 a through which oil oil can be dropped from the position above the bus bars 72 and 73 toward the bus bars 72 and 73.
Therefore, the oil oil can be supplied to each of the bus bars 72 and 73 by using gravity to perform cooling.
Therefore, the number of parts can be reduced, the size can be reduced, and the cost can be reduced, as compared with the case where an oil oil is sent to each of the bus bars 72 and 73 inside the inverter INV.

(4) The cooling system A of the power conversion device according to the first embodiment is
Each bus bar 72, 73 includes through holes 72a, 73a penetrating the bus bars 72, 73.
Therefore, the contact area between the oil oil and the bus bars 72 and 73 is increased, and the cooling performance of the bus bars 72 and 73 is improved as compared with the case where the through holes 72a and 73a are not provided. In addition, the oil oil in the motor housing 50 can be collected smoothly.

(5) The cooling system A of the power conversion device according to the first embodiment is
The first oil passage 101 (second oil passage 102) is formed at the oil supply port 31 a (31 b) formed in the upper portion of the inverter housing 40 and the lower portion of the inverter housing 40 and is connected to the motor housing 50. A flow path forming member 90 disposed between the oil recovery port 32a (32b) and
The second bus bar 72 passes through the flow path forming member 90.
Therefore, the flow path forming member 90 can prevent the oil oil dropped on the second bus bar 72 from scattering to other parts of the inverter INV.

(6) The cooling system A for the power conversion device according to the first embodiment includes:
The third oil flow path 103 is a flow disposed between an oil supply port 31 c formed in the upper portion of the inverter housing 40 and an oil recovery port 32 c formed in the lower portion of the inverter housing 40 and connected to the motor housing 50. A path forming member 190,
The third bus bar 73 penetrates from the outside to the inside of the flow path forming member 190 and is routed from the inside of the flow path forming member 190 to the inside of the motor housing 50 through the oil recovery port 32c.
Therefore, similarly to (5) above, the flow path forming member 190 can prevent the oil oil dropped on the third bus bar 73 from scattering to other parts of the inverter INV. Further, the oil oil dropped on the third bus bar 73 is dropped and collected on the motor housing 50 through the third bus bar 73, so that the oil oil can be collected more smoothly.

(7) The cooling system A of the power conversion device according to the first embodiment is
The inverter housing 40 is arranged on the upper side of the motor housing 50.
Therefore, the oil supplied to the inverter INV can be collected inside the motor housing 50 using gravity, so that the structure can be simplified and the cost can be reduced.

(Other embodiments)
Below, the cooling system of the power converter device of other embodiment is demonstrated. In the description of the cooling system of the power conversion device according to another embodiment, common components are denoted by common reference numerals and description thereof is omitted.

(Embodiment 2)
Next, based on FIG. 5A and FIG. 5B, the cooling system of the power converter of Embodiment 2 is demonstrated.
5A and 5B show a bus bar 271 and a bus bar 272 that are modifications of the second bus bar 72 and the third bus bar 73 shown in the first embodiment.
These bus bars 271 and 272 are formed in a bowl shape capable of temporarily storing oil oil dropped from above.

  The bus bar 271 shown in FIG. 5A is formed in a substantially U-shaped cross section including a groove portion 271c surrounded by a bottom wall 271a and a pair of flange portions 271b raised from both ends in the width direction of the bottom wall 271a. .

Accordingly, the oil oil dropped from the oil supply port 31 is temporarily stored in the groove portion 271c of the bus bar 271 and the oil oil overflowing from both flange portions 271b is dropped and collected inside the motor housing 50.
Therefore, the oil oil dropped on the bus bar 271 is not easily scattered. In addition, since the oil oil is temporarily stored in the groove portion 271c in the bus bar 271, heat exchange between the oil oil and the bus bar 271 can be reliably performed, and the contact area of the bus bar 271 with the oil oil is increased. This also improves the heat exchange performance (cooling performance).

  The bus bar 272 shown in FIG. 5B is formed in a substantially V-shaped cross section by a pair of side walls 272a and 272a, and a groove 272c sandwiched between the side walls 272a and 272a is formed.

  Therefore, in the bus bar 272, the dropped oil oil is not easily scattered. In addition, since the oil oil is temporarily stored in the groove portion 272c, the bus bar 272 can surely exchange heat between the oil oil and the bus bar 272, and the contact area between the bus bar 272 and the oil oil is increased. This also improves the heat exchange performance (cooling performance).

(2-1) The cooling system for the power conversion device according to the second embodiment is:
The bus bars 271 and 272 include groove portions 271c and 272c that can store the coolant supplied from the upper oil supply port 31.

  Therefore, the oil oil dropped on the bus bars 271 and 272 is not easily scattered. In addition, since the oil oil is temporarily stored in the groove portions 271c and 272c, the bus bars 271 and 272 can surely perform heat exchange with the oil oil, and can also increase the contact area with the oil oil. Heat exchange performance (cooling performance) is improved.

(Embodiment 3)
Next, a cooling system for the power conversion device according to the third embodiment shown in FIG. 6 will be described.
The third embodiment is an example in which the flow path forming member 390 is formed integrally with the water jacket 342 that forms the water path in the water jacket 30a, and FIG. 6 shows a portion where the first oil flow path 101 is formed. . Further, as described in the first embodiment, although not shown, the flow path forming member 390 can be integrally formed with the housing 61a of the converter 60.

  The flow path forming member 390 includes an upper cylindrical portion 391, a bus bar mounting cylindrical portion 92, and a lower cylindrical portion 93 similar to the flow path forming member 90 shown in the first embodiment. The upper cylindrical portion 291 is integrally coupled with the water jacket 342.

(3-1) The cooling system for the power conversion device according to the third embodiment is
Since the flow path forming member 390 is formed integrally with the water jacket 342, the number of parts can be reduced and the cost can be reduced.

(Embodiment 4)
Next, a cooling system for the power conversion device according to the fourth embodiment shown in FIGS. 7A and 7B will be described.

The fourth embodiment is an example in which the flow path forming member 490 is formed so that the oil flow path 401 passes through the two second bus bars 72 (a) and 72 (b).
The flow path forming member 490 includes an upper cylindrical portion 491, a bus bar mounting cylindrical portion 492, and a lower cylindrical portion 493. The upper cylindrical portion 491 is disposed above one second bus bar 72 (a), and an oil supply port 31a (not shown) is disposed above the upper cylindrical portion 491.

  As shown in FIG. 7A and FIG. 7B, the bus bar mounting cylinder portion 492 is formed across the two second bus bars 72 and 72. In other words, the space 494 formed by the bus bar mounting cylinder 492 has a width that can accommodate the two second bus bars 72 (a) and 72 (b), as shown in FIG. 7B.

  The lower cylindrical portion 493 is disposed below the other second bus bar 72 (b). The space portion 494 is illustrated with a sufficient space in the vertical direction with respect to both the second bus bars 72 (a) and 72 (b) in the figure, but in actuality, both the second bus bars are illustrated. 72 (a) and 72 (b) are dimensioned to be surely immersed in the oil oil.

  In the fourth embodiment, the oil oil supplied through the upper cylindrical portion 491 passes through the two second bus bars 72 and 72 in the space portion 494 of the bus bar mounting cylinder portion 492 and passes through the lower cylindrical portion. It passes through 493 and is collected in the motor housing 50 (see FIG. 2).

(4-1) The cooling system for the power conversion device according to the fourth embodiment is:
The flow path forming member 490 forms an oil flow path 401 that passes through the two second bus bars 72 (a) and 72 (b).
Therefore, it is possible to reduce the cost by reducing the number of parts.

(Embodiment 5)
Next, the cooling system for the power conversion device according to the fifth embodiment shown in FIGS. 8A, 8B, and 8C will be described.
The fifth embodiment is an example in which two second bus bars 572 (a) and 572 (b) are juxtaposed vertically and penetrated through one flow path forming member 590.

The flow path forming member 590 includes an upper cylindrical part 591, a bus bar mounting cylinder part 592, and a lower cylindrical part 593, and forms an oil flow path 501.
Similar to the first embodiment, the upper cylindrical portion 591 and the lower cylindrical portion 593 are arranged substantially coaxially in the vertical direction.

  The bus bar mounting cylinder portion 592 is formed to have a larger size in the vertical direction than in the first embodiment, and the second bus bars 572 (a) and 572 (b) arranged in parallel above and below are penetrated.

  FIG. 8B is an example in which the through holes 72a of the second bus bars 572 (a) and 572 (b) are provided substantially coaxially in the vertical direction, and FIG. 8C is illustrated in FIG. This is an example of arrangement.

  Therefore, the two second bus bars 572 (a) and 572 (b) can be cooled by one flow path forming member 590, and the number of parts can be reduced to reduce the cost. In addition, the inductance can be reduced by forming the reciprocating circuit by arranging the second bus bars 572 (a) and 572 (b) side by side.

(5-1) The cooling system for the power conversion device according to the fifth embodiment is:
The second bus bars 572 (a) and 572 (b) arranged in parallel above and below were passed through one flow path forming member 590.
Therefore, it is possible to reduce the number of parts and reduce the cost, and it is possible to reduce the inductance.

(Embodiment 6)
Next, the cooling system for the power conversion device according to the sixth embodiment shown in FIGS. 9A and 9B will be described.
The sixth embodiment is a modification of the first embodiment, and is an example in which the flow path forming member 690 is formed by performing outsert resin molding on the second bus bar 72.

The flow path forming member 690 includes an upper cylindrical part 691, a bus bar mounting cylinder part 692, and a lower cylindrical part 693, and forms an oil flow path 601.
Similar to the first embodiment, the upper cylindrical portion 691 and the lower cylindrical portion 693 are arranged substantially coaxially in the vertical direction.

  The bus bar mounting cylinder portion 692 has an upper surface side cylinder portion 692a formed in a substantially inverted U-shaped cross section on the upper surface of the second bus bar 72, and a substantially U-shaped cross section on the lower surface of the second bus bar 72. It is formed by the cylinder part 692a and the lower surface side cylinder part 692b formed vertically symmetrical.

  Therefore, the second bus bar 72 is cooled by the oil oil dropped through the oil flow path 601. Other functions and effects are the same as those of the first embodiment.

(Embodiment 7)
Next, a cooling system for the power conversion device according to the seventh embodiment shown in FIGS. 10A and 10B will be described.
The seventh embodiment is a modification of the fourth embodiment, and the flow path forming member 790 is formed by performing outsert resin molding on the two second bus bars 72 (a) and 72 (b). This is an example.

  The flow path forming member 790 includes an upper cylindrical part 791, a bus bar mounting cylinder part 792, and a lower cylindrical part 793, and forms an oil flow path 701.

  Similarly to the fourth embodiment, the upper cylindrical portion 791 is provided at an upper position of one second bus bar 72 (a), and the lower cylindrical portion 793 is disposed at a lower position of the other second bus bar 72 (b). Has been placed.

  The bus bar mounting cylinder portion 792 is formed across a part of the upper surface and the lower surface of both the second bus bars 72 (a) and 72 (b).

  Accordingly, both the second bus bars 72 (a) and 72 (b) are cooled by the oil oil dropped through the oil flow path 701, as in the fourth embodiment.

(Embodiment 8)
Next, a cooling system for the power conversion device according to the eighth embodiment shown in FIGS. 11A and 11B will be described.
The eighth embodiment is a modification of the fifth embodiment, in which the flow path forming member 890 is replaced with an outsert resin with respect to the two second bus bars 872 (a) and 872 (b) arranged vertically. This is an example formed by molding.

  The flow path forming member 890 includes an upper cylindrical part 891, a bus bar mounting cylinder part 892, and a lower cylindrical part 893, and forms an oil flow path 801.

The bus bar mounting cylinder part 892 is formed by an upper surface side cylinder part 892a, an intermediate cylinder part 892b, and a lower surface side cylinder part 892c.
The upper surface side cylindrical portion 892a is formed in a substantially inverted U-shaped cross section on the upper surface of the second bus bar 872 (a). The intermediate cylinder part 892b is provided in a cylindrical shape between the lower surface of the second bus bar 872 (a) and the upper surface of the second bus bar 872 (b). The lower surface side cylinder portion 892c is formed in a substantially U-shaped cross section on the lower surface of the second bus bar 872 (b).

  Therefore, the two second bus bars 872 (a) and 872 (b) can be cooled by one flow path forming member 890, and the number of parts can be reduced to reduce the cost. In addition, the inductance can be reduced by forming the reciprocating circuit by arranging the second bus bars 872 (a) and 872 (b) side by side.

  As mentioned above, although the cooling system of the power converter device of this indication was demonstrated based on embodiment, it is not restricted to this embodiment about concrete structure, The summary of the invention which concerns on each claim of a claim Design changes and additions are permitted as long as they do not deviate from.

  For example, in the embodiment, the motor and the inverter are arranged in parallel up and down. In this structure, oil (insulating refrigerant) can be collected from the inverter to the motor by using gravity, but the positional relationship between the motor and the inverter is not limited to this. For example, the motor and the inverter may be adjacent to each other in a direction different from the vertical direction such as the horizontal direction, or may be arranged separately. In other words, when equipped with a pump that sucks oil collected in the lower part of the inverter and feeds it into the motor, the motor and the inverter are arranged adjacent to each other in a direction different from the vertical direction, or both are arranged apart from each other. can do.

  The flow path forming member is not limited to the shape shown in the embodiment as long as it can form a flow path in which an insulating fluid is dropped onto the bus bar and dropped from the bus bar. For example, even when a single bus bar is cooled, as shown in the seventh embodiment, it is possible to adopt a structure in which the upper cylindrical portion and the lower cylindrical portion are not arranged coaxially. Further, the shape is not limited to a cylindrical shape, and it can be formed in other tubular shapes or a bowl shape.

30a: Oil passage in water jacket (flow passage in water jacket)
31: Oil supply port (refrigerant supply port)
31a: Oil supply port (refrigerant supply port)
31b: Oil supply port (refrigerant supply port)
31c: Oil supply port (refrigerant supply port)
32: Oil recovery port (refrigerant recovery port)
32a: Oil recovery port (refrigerant recovery port)
32b: Oil recovery port (refrigerant recovery port)
32c: Oil recovery port (refrigerant recovery port)
40: Inverter housing (housing)
42: Water jacket 50: Motor housing 72: Second bus bar 72a: Through hole 73: Third bus bar 73a: Through hole 90: Channel forming member 101: First oil channel (insulating refrigerant channel)
102: second oil flow path (insulating refrigerant flow path)
103: Third oil flow path (insulating refrigerant flow path)
190: 2nd flow path formation member A: 1st cooling system (cooling system of the power converter device of Embodiment 1)
INV: Inverter (power converter)
M: Motor oil: Oil (insulating refrigerant)

Claims (8)

A cooling system for a power converter connected to a motor,
An insulating refrigerant circulated inside the motor;
The insulating refrigerant inside the motor can be dropped onto the bus bar from above the bus bar routed inside the casing of the power conversion device, and the outer casing of the motor is formed from the inside of the casing. An insulative refrigerant flow path formed retrievably in the motor housing;
A cooling system for a power conversion device. In the cooling system of the power converter device according to claim 1,
The cooling system for a power conversion apparatus, wherein the insulating refrigerant flow path includes a water jacket internal flow path that is provided in the power conversion apparatus and formed through a water jacket through which cooling water is circulated. In the cooling system of the power converter device according to claim 2,
The cooling system for a power conversion device, wherein the water jacket internal flow path is provided with a refrigerant supply port through which the insulating refrigerant can be dropped from an upper position of the bus bar toward the bus bar. In the cooling system of the power converter device of any one of Claims 1-3,
The said bus bar is a cooling system of a power converter device provided with the through-hole which penetrated this bus bar. In the cooling system of the power converter device of any one of Claims 1-4,
The said bus bar is a cooling system of the power converter device currently formed in the bowl shape which can store the said insulating refrigerant dripped from upper direction. In the cooling system of the power converter device of any one of Claims 1-5,
The insulating refrigerant flow path is a flow path forming member disposed between a refrigerant supply port formed in the upper part of the casing and a refrigerant recovery port formed in the lower part of the casing and connected to the motor housing. With
The said bus bar is a cooling system of the power converter device provided through the said flow-path formation member. In the cooling system of the power converter device of any one of Claims 1-5,
The insulating refrigerant flow path is a flow path forming member disposed between a refrigerant supply port formed in the upper part of the casing and a refrigerant recovery port formed in the lower part of the casing and connected to the motor housing. With
The cooling system of the power conversion device, wherein the bus bar is penetrated from the outside to the inside of the flow path forming member, and is routed in the motor housing from the inside of the flow path forming member through the refrigerant recovery port. . In the cooling system of the power converter device of any one of Claims 1-5,
The said housing | casing is a cooling system of the power converter device arranged in parallel with the said motor housing.