JP2017101573A - Cooling liquid tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain air bubbles from flowing into a circulation flow passage.SOLUTION: A reservoir tank 11 provided in a circulation flow passage through which cooling liquid flows includes: a tank body 28 having an inlet 26 and an outlet 27 connected to the circulation flow passage so that the cooling liquid flowing through the circulation flow passage flows therethrough; and a plurality of partition plates 30, 40, 50 and 60 provided in the tank body 28 so as to define a plurality of cooling liquid chambers, and forming an opening which communicates the cooling liquid chambers with each another. The partition plates 30-60 include the first partition plate 30 defining the cooling liquid chamber to which the inlet 26 is opened, and the second partition plate 60 defining the cooling liquid chamber to which the outlet 27 is opened. An opening area ratio of the opening to the first partition plate 30 is higher than an opening area ratio of the opening to the second partition plate 60.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coolant tank provided in a circulation channel through which coolant circulates.

  For example, a vehicle such as an automobile is equipped with a cooling system that circulates a coolant to cool the heat generating components in order to cool the heat generating components such as an engine, a motor generator, and an inverter. This cooling system includes a water pump that pumps the coolant, a radiator that dissipates the coolant, a coolant tank that stores the coolant, a circulation channel that connects these components, and the like (see Patent Document 1). .

JP 2014-206115 A

  By the way, as described in Patent Document 1, when a coolant tank is installed on the circulation channel, there is a possibility that bubbles may be mixed into the circulation channel. For example, when the flow rate of the coolant is increased to ensure the cooling performance, the coolant is vigorously stirred in the coolant tank, and bubbles are taken into the coolant in the coolant tank. There is a risk that bubbles may flow into the circulation channel from the coolant tank. Since such inflow of bubbles is a factor that degrades the performance of the cooling system, it is required to suppress the inflow of bubbles into the circulation channel.

  An object of the present invention is to suppress the inflow of bubbles to the circulation channel.

  The cooling liquid tank of the present invention is a cooling liquid tank provided in a circulation flow path through which the cooling liquid circulates, and includes an inlet and an outlet connected to the circulation flow path, through which the cooling liquid flowing through the circulation flow path passes. And a plurality of partition plates provided in the tank body to partition a plurality of cooling liquid chambers and to form openings for communicating the plurality of cooling liquid chambers with each other. The partition plate includes a first partition plate that partitions the coolant chamber that the inlet opens, and a second partition plate that partitions the coolant chamber that the outlet opens, and occupies the first partition plate. The opening area ratio of the opening is higher than the opening area ratio of the opening that occupies the second partition plate.

  According to the present invention, the plurality of partition plates include a first partition plate that partitions the coolant chamber in which the inlet opens, and a second partition plate that partitions in the coolant chamber in which the outlet opens, and the first partition The opening area ratio of the opening occupying the plate is higher than the opening area ratio of the opening occupying the second partition plate. Thereby, entrainment of bubbles in the coolant can be suppressed, and inflow of bubbles into the circulation channel can be suppressed.

It is the schematic which shows the structure of the cooling system mounted in vehicles, such as an electric vehicle. (A) is a perspective view which shows a reservoir tank, (b) is a disassembled perspective view which shows a reservoir tank. It is sectional drawing which shows the internal structure of a reservoir tank. (A)-(d) is a front view which shows a partition plate. (A) is a figure which shows the total area of a lower side board part, (b) is a figure which shows the opening area of an opening part. (A)-(d) is a front view which shows a partition plate. It is explanatory drawing which shows the flow condition of the cooling fluid in a reservoir tank. It is explanatory drawing which shows the flow condition of the cooling fluid in a reservoir tank as a comparative example. (A) is sectional drawing which shows the reservoir tank (cooling liquid tank) which is other embodiment of this invention, (b) is a front view which shows the partition plate accommodated in the tank main body of a reservoir tank.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a cooling system 10 mounted on a vehicle such as an electric vehicle. The illustrated cooling system 10 is provided with a reservoir tank (coolant tank) 11 according to an embodiment of the present invention. In FIG. 1, white arrows indicate the flow direction of the coolant C.

  As shown in FIG. 1, the cooling system 10 includes a reservoir tank 11 that stores the coolant C, a water pump 12 that pumps the coolant C, a motor generator 13 that is a heat generating component, and a radiator that cools the coolant C by heat exchange. 14 and an inverter 15 which is a heat generating component. A water pump 12 is connected to the reservoir tank 11 via a pipe 20, and a motor generator 13 is connected to the water pump 12 via a pipe 21. Further, a radiator 14 is connected to the motor generator 13 via a pipe 22, and an inverter 15 is connected to the radiator 14 via a pipe 23. Further, the reservoir tank 11 is connected to the inverter 15 via a pipe 24. As described above, the cooling system 10 is provided with the circulation flow path 25 including the plurality of pipes 20 to 24, and the cooling system 10 has a structure for circulating the coolant C along the circulation flow path 25. . The motor generator 13 and the inverter 15 are formed with a water jacket (not shown) through which the coolant C flows.

  The coolant C stored in the reservoir tank 11 is supplied to the motor generator 13 via the water pump 12, and is supplied to the radiator 14 after cooling the motor generator 13. Then, the coolant C cooled by the radiator 14 is supplied to the reservoir tank 11 again after the inverter 15 is cooled. Thus, the motor generator 13 and the inverter 15 can be cooled by driving the water pump 12 and circulating the coolant C. At this time, the coolant C circulating through the cooling system 10 circulates while passing through the reservoir tank 11. In the illustrated example, the motor generator 13 that is a heat generating component is provided on the upstream side of the radiator 14, and the inverter 15 that is a heat generating component is provided on the downstream side of the radiator 14. However, the present invention is limited to this. There is no. For example, the heat generating component may be provided only on the downstream side of the radiator 14, or the heat generating component may be provided only on the upstream side of the radiator 14.

[Reservoir tank structure]
The structure of the reservoir tank 11 provided on the circulation channel 25 will be described. FIG. 2A is a perspective view showing the reservoir tank 11, and FIG. 2B is an exploded perspective view showing the reservoir tank 11. FIG. 3 is a cross-sectional view showing the internal structure of the reservoir tank 11.

  As shown in FIGS. 2 and 3, the reservoir tank 11 includes a tank body 28 including an inlet 26 and an outlet 27 connected to the circulation channel 25, and a plurality of partition plates 30 and 40 accommodated in the tank body 28. , 50, 60. The tank main body 28 includes a lower main body portion 28a in which the inlet 26 and the outlet 27 are formed, and an upper main body portion 28b that is joined to the lower main body portion 28a and in which an injection port 29 is formed. As described above, a plurality of partition plates 30 to 60 are accommodated in the tank body 28, and a plurality of coolant chambers 70 to 74 are partitioned in the tank body 28 by these partition plates 30 to 60. . That is, the coolant chamber 70 is partitioned by the partition plate 30, and the coolant chamber 71 is partitioned by the partition plates 30 and 40. Further, the coolant chamber 72 is partitioned by the partition plates 40, 50, the coolant chamber 73 is partitioned by the partition plates 50, 60, and the coolant chamber 74 is partitioned by the partition plate 60.

[Partition plate structure]
The structure of the partition plates 30 to 60 accommodated in the tank body 28 will be described. 4A to 4D are front views showing the partition plates 30 to 60. FIG. As shown in FIGS. 4A to 4D, the partition plates 30 to 60 have lower plate portions 31, 41, 51, 61 below the liquid level height X and above the liquid level height X. Upper plate portions 32, 42, 52, 62. The lower plate portions 31 to 61 of the partition plates 30 to 60 are portions that come into contact with the coolant C in the reservoir tank 11, and the upper plate portions 32 to 62 of the partition plates 30 to 60 are exposed to air in the reservoir tank 11. It is the part to touch. Further, the liquid level height X which is the boundary between the lower plate portions 31 to 61 and the upper plate portions 32 to 62 is the liquid level height of the coolant C stored in the reservoir tank 11 and is shown in the reservoir tank 11. It is set within the range between the upper limit position H and the lower limit position L.

  A plurality of openings 33 to 63 penetrating in the thickness direction are formed in the lower plate portions 31 to 61 of the partition plates 30 to 60. Accordingly, as shown in FIG. 3, in the coolant layer below the liquid level height X, the coolant chambers 70 and 71 communicate with each other through the opening 33 of the partition plate 30, and the opening of the partition plate 40. The coolant chambers 71 and 72 communicate with each other through 43. The coolant chambers 72 and 73 communicate with each other via the opening 53 of the partition plate 50, and the coolant chambers 73 and 74 communicate with each other via the opening 63 of the partition plate 60. With such a configuration, the cooling liquid C flowing into the reservoir tank 11 passes through the openings 33 to 63 of the partition plates 30 to 60, and the cooling liquid chamber 70, the cooling liquid chamber 71, the cooling liquid chamber 72, the cooling liquid The chamber 73 and the coolant chamber 74 are moved in this order.

  Moreover, as shown to Fig.4 (a)-(d), the through-holes 34, 44, 54, and 64 penetrated in the thickness direction are formed in the upper side plate parts 32-62 of the partition plates 30-60. As a result, as shown in FIG. 3, even in the air layer above the liquid level height X, the coolant chambers 70 and 71 communicate with each other through the through hole 34 of the partition plate 30, and the through hole of the partition plate 40. The coolant chambers 71 and 72 communicate with each other through 44. The coolant chambers 72 and 73 communicate with each other through the through hole 54 of the partition plate 50, and the coolant chambers 73 and 74 communicate with each other through the through hole 64 of the partition plate 60.

[Opening area ratio]
The opening area ratio of the openings 33 to 63 occupying the partition plates 30 to 60 will be described. FIG. 5A is a diagram showing the total area of the lower plate portion 31, and FIG. 5B is a diagram showing the opening area of the opening 33.

  First, the opening area ratio of the openings 33 to 63 occupying the partition plates 30 to 60 (hereinafter abbreviated as the opening area ratio of the partition plates) is the opening 33 to occupying the total area of the lower plate portions 31 to 61. The ratio of the opening area of 63. Here, the opening area ratio will be described by taking the partition plate 30 as an example. As shown by cross hatching in FIG. 5A, the total area α of the lower plate portion 31 used for calculating the opening area ratio is the entire area of the lower plate portion 31 including the opening 33. Further, as shown by cross-hatching in FIG. 5B, the opening area β of the opening 33 used for calculating the opening area ratio is the opening area of all the openings 33 formed in the lower plate portion 31. The total opening area. That is, as the opening area ratio of the partition plate 30 is higher, the opening area of the opening portion 33 occupying the total area of the lower plate portion 31 is increased, so that the flow path resistance of the partition plate 30 is reduced and the coolant C easily flows. Is meant to be. On the other hand, as the opening area ratio of the partition plate 30 is lower, the opening area of the opening 33 occupying the total area of the lower plate portion 31 is reduced, so that the flow path resistance of the partition plate 30 is increased and the coolant C hardly flows. Is meant to be.

  Here, as shown to Fig.4 (a)-(d), the opening area ratio of the partition plates 30-60 is set low in order of the partition plate 30, the partition plate 40, the partition plate 50, and the partition plate 60. FIG. . That is, the opening area ratio of the partition plate 30 is set higher than the opening area ratio of the partition plate 40. The opening area ratio of the partition plate 40 is set higher than the opening area ratio of the partition plate 50, and the opening area ratio of the partition plate 50 is set higher than the opening area ratio of the partition plate 60. That is, the opening area ratio of the partition plate (first partition plate) 30 that partitions the coolant chamber 70 where the inlet 26 opens is the partition plate (second partition plate) 60 that partitions the coolant chamber 74 where the outlet 27 opens. Is set higher than the opening area ratio. In this way, by setting the opening area ratio of the partition plates 30 to 60, the flow path resistance of the partition plates 30 to 60 is gradually increased from the upstream inlet 26 side to the downstream outlet 27 side. ing. Thus, the pressure loss when the coolant C passes through the partition plates 30 to 60 from the inlet 26 side to the outlet 27 side is set to gradually increase.

[Opening position]
The positions of the openings 33 to 63 formed in the partition plates 30 to 60 will be described. 6A to 6D are front views showing the partition plates 30 to 60. FIG. 6A and 6B, among the plurality of openings 33 formed in the partition plate 30, the center Pa of the opening 33x and the plurality of openings 43 formed in the partition plate 40. It is separated from the center Pb of the opening 43x at a predetermined interval a1 in the height direction. 6B and 6C, among the plurality of openings 43 formed in the partition plate 40, the center Pb of the opening 43 x and the plurality of openings 53 formed in the partition plate 50. It is separated from the center Pc of the opening 53x at a predetermined interval a2 in the height direction. 6C and 6D, among the plurality of openings 53 formed in the partition plate 50, the center Pc of the opening 53 x and the plurality of openings 63 formed in the partition plate 60. It is separated from the center Pd of the opening 63x by a predetermined interval a3 in the height direction.

  That is, in the pair of partition plates facing each other, the center of at least one of the plurality of first openings formed in one of the partition plates is the center of the plurality of second openings formed in the other of the partition plates. It is off. For example, in the pair of partition plates 40 and 50 facing each other, the center of at least one of the plurality of first openings 43 (53) formed in one of the partition plates 40 and 50 is the partition plate 40 or 50. It has shifted | deviated from the center of several 2nd opening part 53 (43) formed in the other. Thus, by shifting at least a part of the openings facing each other, it is possible to prevent the coolant C flowing from the inlet 26 from flowing straight as it is. That is, the coolant C can be brought into contact with the wall surfaces of the partition plates 30 to 60, and the flow direction of the coolant C can be dispersed. In the illustrated example, in the pair of partition plates facing each other, the centers of some of the openings facing each other are the same, but the present invention is not limited to this, and the centers of all the openings facing each other May be shifted.

[Flow status in reservoir tank]
Subsequently, the flow state of the coolant C in the reservoir tank 11 will be described. FIG. 7 is an explanatory diagram showing the flow state of the coolant C in the reservoir tank 11. In FIG. 7, the arrow indicates the flow direction of the coolant C.

  As described above, the plurality of partition plates 30 to 60 are accommodated in the tank body 28. Thereby, whenever the cooling fluid C passes the partition plates 30-60, the flow rate of the cooling fluid C can be reduced in steps, and the flow velocity distribution of the cooling fluid C can be dispersed. That is, since a rapid change in the flow rate of the cooling liquid C can be suppressed, as shown in FIG. Entrainment can be suppressed.

  In addition, the opening area ratio of the partition plate 30 that partitions the coolant chamber 70 where the inlet 26 opens is set higher than the opening area ratio of the partition plate 60 that partitions the coolant chamber 74 where the outlet 27 opens. Thus, the coolant C can be quickly moved from the coolant chamber 70 to the coolant chamber 71 by reducing the flow path resistance of the partition plate 30 provided on the upstream side. Thereby, since the liquid level of the cooling liquid C can be stabilized in the cooling liquid chamber 70 into which the cooling liquid C flows vigorously, entrainment of bubbles in the cooling liquid C can be suppressed. Furthermore, the coolant C can be moved slowly from the coolant chamber 73 to the coolant chamber 74 by increasing the flow path resistance of the partition plate 60 provided on the downstream side. Thereby, in the cooling liquid chamber 74 that supplies the cooling liquid C to the outlet 27, the liquid level of the cooling liquid C can be stabilized and the entrainment of bubbles can be suppressed, and the inflow of bubbles from the outlet 27 to the circulation channel 25 can be prevented. Can be suppressed.

  Further, as described above, in the pair of partition plates facing each other, the center of at least one of the plurality of first openings formed in one of the partition plates is the plurality of second plates formed in the other of the partition plates. 2 Deviation from the center of the opening. Thus, by shifting at least a part of the openings facing each other, the coolant C flowing from the inlet 26 can be prevented from flowing linearly as it is. Thereby, as shown in FIG. 7, when the coolant C flows from the inlet 26 to the outlet 27, the coolant C can be brought into contact with the wall surfaces of the partition plates 30 to 60, and the flow direction of the coolant C is dispersed. Can be made. In this way, by dispersing the flow direction of the coolant C, the flow velocity can be reduced stepwise, so that entrainment of bubbles in the coolant C can be suppressed. In addition, since the cooling liquid C comes into contact with the wall surfaces of the partition plates 30 to 60 and the flow direction is dispersed vertically, even if the cooling liquid C contains bubbles, the bubbles can be guided upward. Therefore, the gas-liquid separation property in the reservoir tank 11 can be improved.

  Here, FIG. 8 is an explanatory diagram showing a flow state of the coolant C in the reservoir tank 100 as a comparative example. In FIG. 8, the arrow indicates the flow direction of the coolant C. As shown in FIG. 8, when the partition plate is not accommodated in the reservoir tank 100, the coolant C flowing from the inlet 101 moves linearly toward the wall surface of the reservoir tank 100 without greatly decelerating. . Then, since the coolant C is dammed to the wall surface of the reservoir tank 100, the coolant C is largely divided up and down along the wall surface. Thus, damming the cooling liquid C on the wall surface is a factor that causes the liquid level of the cooling liquid C to be violated, and thus has been a factor that entrains the bubbles A into the cooling liquid C. Such entrainment of the bubbles A into the coolant C is a factor that causes the bubbles A to be discharged from the outlet 102. However, by using the reservoir tank 11 of the embodiment as described above, Entrainment can be suppressed and the inflow of bubbles to the circulation channel 25 can be suppressed.

  Further, in the reservoir tank 11 of the embodiment, the upper side plates 32 to 62 of the partition plates 30 to 60 are brought into contact with the inner surface of the tank main body 28. Thereby, even if acceleration acts on the cooling liquid C in the reservoir tank 11 due to acceleration / deceleration of the electric vehicle, the cooling liquid C gets over the partition plates 30-60 and the cooling liquid chambers 70-74. The movement and entrainment of bubbles can be suppressed without moving between them. Furthermore, since the through holes 34 to 64 are formed in the upper plate portions 32 to 62 of the partition plates 30 to 60, the air separated from the cooling liquid C in each of the cooling liquid chambers 70 to 74 is transferred to each cooling liquid chamber 70. It moves to the injection port 29 through the through holes 34 to 64 without staying at -74, and is discharged to the outside through a discharge path (not shown) communicating with the injection port 29.

  An inlet 26 is formed on the side surface 28 c of the tank body 28, and an outlet 27 is formed on the bottom surface 28 d of the tank body 28. Thus, by arranging the inlet 26 and the outlet 27 without facing each other, the inflow of bubbles to the outlet 27 can be prevented. In addition, an outlet 27 is provided below the inlet 26, and from this point, air bubbles can be prevented from flowing into the outlet 27. Further, since the outlet 27 is formed on the bottom surface 28d of the tank body 28, the coolant C is guided from the outlet 27 to the water pump 12 directly below. Thereby, even when the coolant C is injected into the empty reservoir tank 11, air can be easily discharged from the pipe 20 connecting the reservoir tank 11 and the water pump 12.

[Other embodiments]
In the reservoir tank 11 described above, four partition plates 30 to 60 are accommodated in the tank main body 28, but the present invention is not limited to this, and the tank main body 28 accommodates two or more partition plates. Just do it. FIG. 9A is a sectional view showing a reservoir tank (coolant tank) 80 according to another embodiment of the present invention, and FIG. 9B is a partition plate accommodated in the tank body 81 of the reservoir tank 80. It is a front view which shows 90a, 90b. In FIG. 9, members and parts similar to those shown in FIGS. 3 and 4 are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 9A, the tank body 81 of the reservoir tank 80 accommodates two partition plates 90a and 90b. A plurality of coolant chambers 82 to 84 are partitioned in the tank body 81 by these partition plates 90a and 90b. That is, the coolant chamber 82 is partitioned by the partition plate 90a, the coolant chamber 83 is partitioned by the partition plates 90a and 90b, and the coolant chamber 84 is partitioned by the partition plate 90b. Moreover, as shown in FIG.9 (b), several opening part 93a, 93b penetrated in the thickness direction is formed in the lower plate part 91a, 91b of the partition plates 90a, 90b. Accordingly, as shown in FIG. 9A, in the coolant layer below the liquid level height X, the coolant chambers 82 and 83 communicate with each other through the opening 93a of the partition plate 90a, and the partition plate 90b. The coolant chambers 83 and 84 communicate with each other through the opening 93b. With such a configuration, the coolant C flowing into the reservoir tank 80 moves in the order of the coolant chamber 82, the coolant chamber 83, and the coolant chamber 84 while passing through the openings 93a and 93b of the partition plates 90a and 90b. To do.

  As shown in FIG. 9B, the opening area ratio of the partition plates 90a and 90b is set to be lower in the order of the partition plate 90a and the partition plate 90b. That is, the opening area ratio of the partition plate (first partition plate) 90a that partitions the coolant chamber 82 where the inlet 26 opens is equal to the partition plate (second partition plate) 90b that partitions the coolant chamber 84 where the outlet 27 opens. Is set higher than the opening area ratio. The center Pe of the opening 93e among the plurality of openings 93a formed in the partition plate 90a and the center Pf of the opening 93f among the plurality of openings 93b formed in the partition plate 90b are in the height direction. At a predetermined interval a4. That is, in the pair of partition plates 90a and 90b facing each other, at least one of the centers of the plurality of first openings 93a (93b) formed on one of the partition plates 90a and 90b is the center of the partition plates 90a and 90b. It has shifted | deviated from the center of several 2nd opening part 93b (93a) formed in the other.

  Thus, even when the two partition plates 90a and 90b are accommodated in the tank body 81 of the reservoir tank 80, the same effect as that of the reservoir tank 11 described above can be obtained. That is, since the flow rate of the cooling liquid C can be lowered stepwise, the entrainment of bubbles in the cooling liquid C can be suppressed without causing the liquid levels of the respective cooling liquid chambers 82 to 84 to be greatly violated.

  The opening area ratio of the partition plate 90a provided on the inlet 26 side is set higher than the opening area ratio of the partition plate 90b provided on the outlet 27 side. Thus, the coolant C can be quickly moved from the coolant chamber 82 to the coolant chamber 83 by reducing the flow path resistance of the partition plate 90 a provided on the upstream side. Thereby, since the liquid level of the cooling liquid C can be stabilized in the cooling liquid chamber 82 into which the cooling liquid C flows vigorously, entrainment of bubbles in the cooling liquid C can be suppressed. Furthermore, the coolant C can be moved slowly from the coolant chamber 83 to the coolant chamber 84 by increasing the flow path resistance of the partition plate 90 b provided on the downstream side. Thereby, in the cooling liquid chamber 84 for supplying the cooling liquid C to the outlet 27, the liquid level of the cooling liquid C can be stabilized and the entrainment of bubbles can be suppressed, and the inflow of bubbles from the outlet 27 to the circulation channel 25 can be prevented. Can be suppressed.

  In addition, as described above, in the pair of partition plates 90a and 90b facing each other, the center of at least one of the plurality of first openings 93a (93b) formed on one of the partition plates 90a and 90b is a partition. It has shifted | deviated from the center of several 2nd opening part 93b (93a) formed in the other of board 90a, 90b. Thus, by shifting at least a part of the openings 93a and 93b facing each other, it is possible to prevent the coolant C flowing from the inlet 26 from flowing linearly as it is. Thereby, when the coolant C flows from the inlet 26 to the outlet 27, the coolant C can be brought into contact with the wall surfaces of the partition plates 90a and 90b, and the flow direction of the coolant C can be dispersed. In this way, by dispersing the flow direction of the coolant C, the flow velocity can be reduced stepwise, so that entrainment of bubbles in the coolant C can be suppressed.

  As shown in FIG. 9A, in the reservoir tank 80, the upper plate portions 92 a and 92 b of the partition plates 90 a and 90 b are brought into contact with the inner surface of the tank main body 81. Thereby, even when acceleration acts on the cooling liquid C in the reservoir tank 80 due to acceleration / deceleration of the electric vehicle, the cooling liquid C gets over the partition plates 90a and 90b and the cooling liquid chambers 82 to 84. The movement and entrainment of bubbles can be suppressed without moving between them. Further, through holes 94a and 94b are formed in the upper plate portions 92a and 92b of the partition plates 90a and 90b. For this reason, the air separated from the cooling liquid C in each of the cooling liquid chambers 82 and 83 does not stay in each of the cooling liquid chambers 82 and 83 but moves to the injection port 29 through the through holes 94a and 94b. Is discharged to the outside through a discharge route (not shown).

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. In the above description, the motor generator 13 and the inverter 15 are cited as the heat generating components for cooling, but are not limited thereto. For example, the present invention may be applied to a cooling system that cools an engine, or the present invention may be applied to a cooling system that cools heat-generating parts other than automobile parts. In the above description, a plurality of openings 33, 43, 53, 63, 93a, 93b are formed for the respective partition plates 30, 40, 50, 60, 90a, 90b. However, one opening may be formed for each partition plate.

11 Reservoir tank (coolant tank)
25 Circulating channel 26 Inlet 27 Outlet 28 Tank body 30 Partition plate (first partition plate)
31 Lower plate 32 Upper plate 33, 33x Opening (first opening, second opening)
34 Through-hole 40 Partition plate 41 Lower plate portion 42 Upper plate portion 43, 43x Opening portion (first opening portion, second opening portion)
44 Through-hole 50 Partition plate 51 Lower plate portion 52 Upper plate portion 53, 53x Opening portion (first opening portion, second opening portion)
54 Through hole 60 Partition plate (second partition plate)
61 Lower plate 62 Upper plate 63, 63x Opening (first opening, second opening)
64 Through holes 70 to 74 Coolant chamber 80 Reservoir tank (coolant tank)
81 Tank body 82 to 84 Coolant chamber 90a Partition plate (first partition plate)
91a Lower plate portion 92a Upper plate portions 93a, 93e Openings (first opening, second opening)
94a Through hole 90b Partition plate (second partition plate)
91b Lower plate portion 92b Upper plate portions 93b, 93f Openings (first opening, second opening)
94b Through-hole C Cooling liquid X Liquid level height Pa to Pf Center

Claims (4)

A coolant tank provided in a circulation channel through which the coolant circulates,
A tank body comprising an inlet and an outlet connected to the circulation flow path, through which a coolant flowing through the circulation flow path passes;
A plurality of partition plates provided in the tank body to partition a plurality of cooling liquid chambers and formed with openings for communicating the plurality of cooling liquid chambers;
Have
The plurality of partition plates include a first partition plate that partitions a coolant chamber in which the inlet opens, and a second partition plate that partitions in a coolant chamber in which the outlet opens,
The coolant tank, wherein an opening area ratio of the opening occupying the first partition plate is higher than an opening area ratio of the opening occupying the second partition plate. The coolant tank according to claim 1, wherein
The plurality of partition plates include a lower plate portion below the liquid level height,
The said opening area ratio is a coolant tank which is a ratio of the opening area of the said opening part which occupies for the total area of the said lower side board part. The coolant tank according to claim 1 or 2,
The plurality of partition plates include a pair of partition plates facing each other,
A plurality of first openings are formed as the openings in one of the pair of partition plates,
A plurality of second openings are formed as the openings on the other of the pair of partition plates,
The coolant tank, wherein the center of at least one of the plurality of first openings is shifted from the center of the plurality of second openings. In the cooling fluid tank according to any one of claims 1 to 3,
The plurality of partition plates include an upper plate portion above the liquid level height,
A coolant tank in which a through hole is formed in the upper plate portion.

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