JP2017166347A - Reserve tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reserve tank which can suppress entrainment of air into a cooling liquid even when a circulation flow rate of the cooling liquid is increased in a cooling system.SOLUTION: A first flow-out port 16b and a second flow-out port 16c are arranged at a reserve tank 16. Then, the second flow-out port 16c is arranged so that a route length of a second circulation route FL2 becomes longer than a route length of a first circulation route FL1. By this constitution, a flow rate of a cooling liquid flowing in the first circulation route FL1 which is longer in the route length is suppressed, and accordingly, ruffling of liquid surfaces 28e, 28f, 28g and 28h in a tank body part 28 becomes small. As a result, even when a circulation flow rate of the cooling liquid is increased in a cooling system 10, the entrainment of air into the cooling liquid can be suppressed in the tank body part 28.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reserve tank used in a cooling system for cooling an object to be cooled.

  As a reserve tank of this type, for example, a reserve tank described in Patent Document 1 is conventionally known. The reserve tank described in Patent Document 1 constitutes a part of a cooling system in which a coolant circulates. The inside of the reserve tank of Patent Document 1 is partitioned by an internal partition wall in which a through hole is formed, and thereby, a plurality of liquid storage chambers for storing cooling liquid are formed in the reserve tank.

  And the reserve tank of patent document 1 has one inflow port and one outflow port. That is, the coolant flows into the reserve tank from one inlet, and the coolant in the reserve tank flows out from one outlet.

JP 2010-19157 A

  By the way, in order to improve the cooling capacity of the cooling system including the reserve tank, for example, the circulation flow rate of the cooling liquid in the cooling system is increased. In the reserve tank of Patent Document 1, when the circulating flow rate of the coolant is increased as described above, the liquid of the coolant in the reserve tank is caused by the resistance of the internal partition provided for separation of the coolant and air. The surface will wave. In addition, the coolant sucked from the reserve tank to the outlet is strongly sucked at a large flow rate. As a result, air such as bubbles generated in the reserve tank is sucked into the outlet together with the cooling liquid as the circulating flow rate of the cooling liquid increases.

  In short, in the reserve tank of Patent Document 1, the coolant entrains air as the circulating flow rate of the coolant increases, and the coolant entrained by the air flows to the pipe connected to the outlet of the reserve tank. Become. When the cooling liquid entrained with air circulates in the cooling system, the cooling efficiency of the cooling system decreases. As a result of detailed studies by the inventors, the above has been found.

  In view of the above points, the present invention provides a reserve tank that can suppress the entrainment of air into the liquid even if the circulation flow rate of the liquid (for example, the cooling liquid) increases in a circulation circuit including the reserve tank. For the purpose.

In order to achieve the above object, according to the first aspect of the present invention, the reserve tank comprises:
A tank body (28) for storing liquid;
An inlet part (30) formed with a tank inlet (16a) for allowing liquid to flow into the tank body part;
A first outlet (31) formed with a first tank outlet (16b) for allowing liquid to flow out of the tank body;
A second outlet (32) formed with a second tank outlet (16c) for allowing liquid to flow out of the tank body,
The second tank outlet is a second circulation path (the liquid flows from the tank inlet to the second tank outlet) than the path length of the first circulation path (FL1) from the tank inlet to the first tank outlet. FL2) is arranged such that the path length is shorter.

  As a result, the liquid that has entered the tank body from the tank inlet is divided into the first flow path and the second flow path. And the flow volume of the liquid which flows through the 1st distribution path | route with a longer path | route length is suppressed, and the ripple of the liquid level in a tank main-body part becomes small according to it. Furthermore, since there are a plurality of tank outlets, for example, the liquid flow rate per tank outlet becomes smaller than when there is no second tank outlet. In other words, the liquid is weakly sucked from the tank main body per tank outlet. As a result, even when the circulation flow rate of the liquid increases in the circulation circuit including the reserve tank, it is possible to suppress the air from being entrained in the liquid as compared with the reserve tank disclosed in Patent Document 1, for example.

  In addition, each code | symbol in the bracket | parenthesis described in a claim and this column is an example which shows a corresponding relationship with the specific content as described in embodiment mentioned later.

It is the figure which showed schematic structure of the cooling system containing the reserve tank of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank of a 1st and 2nd reference example, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment. It is the figure which showed schematic structure of the cooling system of the 1st reference example, Comprising: It is a figure corresponded in FIG. 1 of 1st Embodiment. It is the figure which showed schematic structure of the cooling system of the 2nd reference example, Comprising: It is a figure corresponded in FIG. 1 of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank of 2nd Embodiment, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank of 3rd Embodiment, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank in the 1st modification of 1st Embodiment, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank in the 2nd modification of 1st Embodiment, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment. It is sectional drawing which showed the internal structure of the reserve tank in the 3rd modification of 1st Embodiment, Comprising: It is a figure corresponded in FIG. 2 of 1st Embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
FIG. 1 is a diagram showing a schematic configuration of a cooling system 10 including a reserve tank 16 of the present embodiment. As shown in FIG. 1, the cooling liquid circulates in the cooling system 10, and the cooling system 10 cools the cooling target 22 with the cooling liquid. That is, the cooling liquid circulating through the cooling system 10 is a liquid for cooling the cooling target 22 such as a vehicle engine. The cooling system 10 is mounted on a vehicle, for example. In FIG. 1, arrows along the connecting pipes 181, 182, 183, 184 or the bypass pipe 185 indicate the flow of the coolant in each pipe.

  The cooling system 10 includes a water pump 12, a radiator 14 that is a radiator, a reserve tank 16, a plurality of connection pipes 181, 182, 183, 184, and a bypass pipe 185.

  The first connection pipe 181 connects the discharge port 12 b of the water pump 12 and the coolant inlet 22 a of the cooling target 22, and the second connection pipe 182 is the coolant outlet 22 b of the cooling target 22 and the coolant inlet of the radiator 14. 14a. The third connection pipe 183 connects the coolant outlet 14 b of the radiator 14 and the tank inlet 16 a of the reserve tank 16, and the fourth connection pipe 184 connects the first tank outlet 16 b of the reserve tank 16 and the water pump 12. The suction port 12a is connected. The bypass pipe 185 connects the second tank outlet 16 c of the reserve tank 16 in the middle of the fourth connection pipe 184.

  The water pump 12 has a suction port 12a and a discharge port 12b. The water pump 12 sucks the cooling liquid from the suction port 12a and discharges the sucked cooling liquid from the discharge port 12b.

  The cooling liquid discharged from the discharge port 12 b of the water pump 12 flows to the cooling liquid inlet 22 a of the cooling target 22 through the first connection pipe 181. The cooling liquid flows into the cooling target 22 from the cooling liquid inlet 22a, flows through the cooling target 22, and cools the cooling target 22. Then, the coolant flows from the coolant outlet 22 b of the cooling target 22 to the coolant inlet 14 a of the radiator 14 through the second connection pipe 182.

  The radiator 14 causes heat exchange between the coolant and the air flowing in from the coolant inlet 14a of the radiator 14 and thereby dissipates heat from the coolant. Then, the radiator 14 causes the coolant after the heat dissipation to flow out from the coolant outlet 14b of the radiator 14. The coolant that has flowed out of the coolant outlet 14 b flows to the tank inlet 16 a of the reserve tank 16 through the third connection pipe 183.

  The coolant flowing into the reserve tank 16 from the tank inlet 16a flows out from each of the first tank outlet 16b and the second tank outlet 16c. The coolant that has flowed out of the first tank outlet 16b flows to the inlet 12a of the water pump 12 through the fourth connection pipe 184. At the same time, the coolant flowing out from the second tank outlet 16c flows in the middle of the fourth connecting pipe 184, and merges with the coolant flowing out from the first tank outlet 16b to the suction port 12a of the water pump 12. Flowing.

  FIG. 2 is a cross-sectional view showing the internal structure of the reserve tank 16. FIG. 2 shows a state in which the coolant flows in the reserve tank 16 by the operation of the water pump 12 and the coolant is stored in the reserve tank 16. An arrow DR1 in FIG. 2 indicates the vertical direction DR1 of the reserve tank 16.

  The reserve tank 16 has a gas-liquid separation function for separating air mixed in the coolant circulating through the cooling system 10 from the coolant. Further, the reserve tank 16 plays a role of absorbing the increase and decrease of the volume according to the temperature change of the coolant.

  Specifically, as shown in FIG. 2, the reserve tank 16 includes a tank body portion 28, an inlet portion 30, a first outlet portion 31, a second outlet portion 32, and a pressure adjusting cap 34. The tank main body portion 28, the inlet portion 30, the first outlet portion 31, and the second outlet portion 32 are integrally formed, for example, and are made of a resin such as polypropylene.

  The inside of the tank body 28 is hollow, and the tank body 28 stores the coolant in the tank body 28. Specifically, the tank main body portion 28 has a plurality of internal partition walls 281, 282, and 283, and the plurality of internal partition walls 281, 282, and 283 have a plurality of liquid storage reservoirs that store the coolant in the tank main body portion 28. The chambers 28a, 28b, 28c and 28d are partitioned. For example, the plurality of liquid storage chambers 28a, 28b, 28c, and 28d are arranged side by side in the horizontal direction.

  The total amount of the coolant circulating through the cooling system 10 is, for example, the liquid level 28e, 28f, 28g in each of the plurality of liquid storage chambers 28a, 28b, 28c, 28d without the reserve tank 16 being filled with the coolant. , 28h are adjusted.

  The plurality of internal partition walls 281, 282, and 283 are all formed integrally with the outer shell 284 of the tank body 28. Therefore, both the outer shell 284 and the inner partition walls 281, 282, and 283 of the tank body 28 are made of resin such as polypropylene.

  In addition, communication paths 281a, 282a, and 283a are formed in the plurality of internal partition walls 281, 282, and 283, respectively. The communication passages 281a, 282a, and 283a are through holes that allow the coolant to pass therethrough.

  Therefore, the first liquid storage chamber 28a and the second liquid storage chamber 28b adjacent to each other with the first internal partition wall 281 interposed therebetween are connected to each other through the first communication path 281a. The second liquid storage chamber 28b and the third liquid storage chamber 28c adjacent to each other with the second internal partition wall 282 interposed therebetween are connected to each other through the second communication path 282a. The third liquid storage chamber 28c and the fourth liquid storage chamber 28d adjacent to each other across the third internal partition wall 283 are connected to each other through the third communication path 283a. In short, the plurality of liquid storage chambers 28a, 28b, 28c, and 28d are connected to each other via the plurality of communication paths 281a, 282a, and 283a.

  The pressure adjusting cap 34 is attached to the tank body 28 and adjusts the air pressure in the tank body 28.

  The inlet portion 30, the first outlet portion 31, and the second outlet portion 32 are all formed in a pipe shape, for example. A tank inlet 16 a through which the coolant flows into the tank main body 28 is formed in the inlet 30. Specifically, the tank inlet 16 a is connected to the first liquid storage chamber 28 a, and allows the coolant to flow into the first liquid storage chamber 28 a in the tank body 28.

  Further, a first tank outlet 16 b that allows the coolant to flow out from the tank body 28 is formed in the first outlet 31. Specifically, the first tank outlet 16b is connected to the fourth liquid storage chamber 28d, and the coolant flows out from the fourth liquid storage chamber 28d in the tank main body 28.

  Further, a second tank outlet 16 c that allows the coolant to flow out from the tank body 28 is formed in the second outlet 32. The second tank outlet 16c is an outlet provided separately from the first tank outlet 16b. Specifically, the second tank outlet 16c is connected to the first liquid storage chamber 28a, and allows the coolant to flow out from the first liquid storage chamber 28a in the tank main body 28. For example, the second tank outlet 16c is connected to the side surface of the first liquid storage chamber 28a with respect to the first liquid storage chamber 28a.

  Here, the liquid storage chamber to which the second tank outlet 16c is connected among the plurality of liquid storage chambers 28a, 28b, 28c, and 28d is referred to as a specific liquid storage chamber 28x. Of the first tank outlet 16b and the plurality of communication passages 281a, 282a, and 283a, an inlet through which the coolant flows into the specific liquid storage chamber 28x is referred to as a specific inlet 28y, and from the specific liquid storage chamber 28x. The outlet from which the cooling liquid flows out is referred to as a specific outlet 28z.

  Then, in this embodiment, the first liquid storage chamber 28a corresponds to the specific liquid storage chamber 28x, the tank inlet 16a corresponds to the specific inlet 28y, and the first communication passage 281a corresponds to the specific outlet 28z.

  As shown in FIG. 2, in the reserve tank 16, the second tank outlet 16c communicates with the specific liquid storage chamber 28x below the specific outlet 28z. In other words, the second tank outlet 16c communicates with the first liquid storage chamber 28a below the first communication passage 281a. The vertical relationship between the second tank outlet 16c and the first communication path 281a is, for example, the upper end of the connection ends of the second tank outlet 16c and the first communication path 281a with respect to the first liquid storage chamber 28a. It is judged by comparing each other. That is, the upper ends of the connection ends are compared with each other, and the connection end of the second tank outlet 16c is lower than the connection end of the first communication passage 281a.

  Thereby, in the 1st liquid storage chamber 28a, the liquid flow which goes to the 2nd tank outflow port 16c from the tank inflow port 16a is located below the liquid flow which goes to the 1st communicating path 281a from the tank inflow port 16a. Become.

  Further, in the reserve tank 16, the second tank outlet 16c communicates with the specific liquid storage chamber 28x below the specific inlet 28y. In other words, the second tank outlet 16c communicates with the first liquid storage chamber 28a below the tank inlet 16a. The vertical relationship between the second tank outlet 16c and the tank inlet 16a is such that, for example, the upper ends of the connection ends of the second tank outlet 16c and the tank inlet 16a with respect to the first liquid storage chamber 28a are connected to each other. It is judged by comparison. That is, comparing the upper ends of the connection ends, the connection end of the second tank outlet 16c is lower than the connection end of the tank inlet 16a.

  Thereby, in the 1st liquid storage chamber 28a, the liquid flow which goes to the 2nd tank outflow port 16c from the tank inflow port 16a becomes downward. That is, the liquid flow is opposite to the bubbles moving upward in the cooling liquid.

  As can be seen from FIG. 2, the second tank outlet 16c is arranged such that the path length of the second circulation path FL2 is shorter than the path length of the first circulation path FL1. The first flow path FL1 is a flow path in the tank main body 28 from which the coolant flows from the tank inlet 16a to the first tank outlet 16b. The second flow path FL2 is a flow path in the tank main body 28 from which the coolant flows from the tank inlet 16a to the second tank outlet 16c.

  Further, in the first flow path FL1, the plurality of liquid storage chambers 28a, 28b, 28c, and 28d are arranged from the upstream side of the first flow path FL1 to the first liquid storage chamber 28a, the second liquid storage chamber 28b, and the third storage tank. The liquid chamber 28c and the fourth liquid storage chamber 28d are connected in series in this order. Therefore, the number of communication paths 281a, 282a, and 283a through which the coolant flowing through the first flow path FL1 passes is three. On the other hand, the number of communication paths 281a, 282a, 283a through which the coolant flowing through the second flow path FL2 passes is zero. That is, in the reserve tank 16 of the present embodiment, the number of communication paths 281a, 282a, 283a through which the coolant flowing through the second circulation path FL2 passes is the number of communication paths 281a, 282a, through which the coolant flowing through the first circulation path FL1 passes. Less than the number of 283a.

  Next, in order to explain the effect produced by the reserve tank 16 of the present embodiment, a generally known reserve tank 91 as a first reference example and a cooling system 90 including the reserve tank 91 will be described. A reserve tank 91 as a first reference example is configured as shown in FIG. 3, and a cooling system 90 including the reserve tank 91 is configured as shown in FIG.

  That is, as shown in FIGS. 3 and 4, the reserve tank 91 of the first reference example does not have the second outlet portion 32 and the second tank outlet 16 c in comparison with the reserve tank 16 of the present embodiment. ing. Therefore, the cooling system 90 of the first reference example does not have the bypass pipe 185 as compared with the cooling system 10 of the present embodiment.

  In order to improve the cooling capacity in such a cooling system 90, for example, the circulating flow rate of the coolant in the cooling system 90 is increased. However, in the reserve tank 91 of the first reference example, the outlet for allowing the coolant to flow out is only the first tank outlet 16b, in short, only one. Therefore, when the circulating flow rate of the cooling liquid is increased, the internal partition walls 281, 282, and 283 provided for separating the cooling liquid and air in the reserve tank 91 as shown in FIG. Due to the resistance, the liquid levels 28e, 28f, 28g, and 28h of the cooling liquid undulate. In addition, the coolant sucked from the tank main body 28 of the reserve tank 91 into the first tank outlet 16b is strongly sucked at a large flow rate. As a result, in the reserve tank 91 of the first reference example, air such as bubbles generated in the tank main body portion 28 along with the increase in the circulating flow rate of the cooling liquid flows from the first tank outlet 16b together with the cooling liquid. It will be sucked into the 4-connection pipe 184.

  In short, in the reserve tank 91 of the first reference example, the cooling liquid entrains the air as the circulating flow rate of the cooling liquid increases, and the cooling liquid entraining the air is connected to the first tank outlet 16b. It is easy to flow to the 4 connecting pipe 184. When the cooling liquid entrained with air circulates in the cooling system 90, the cooling efficiency of the cooling system 90 decreases.

  As a countermeasure against the first reference example, in order to prevent air from being entrained in the coolant in the reserve tank 91, the reserve tank 91 is left as it is, and a bypass circuit is provided in the cooling system 93 to provide a coolant in the reserve tank 91. It is conceivable to reduce the flow rate.

  A specific example of this is a second reference example that is not yet known. That is, the cooling system 93 of the second reference example has the reserve tank 91 of FIG. 3 as it is. And the cooling system 93 is provided with the bypass pipe 94 which comprises a bypass circuit as shown in FIG. 5 compared with the cooling system 90 of a 1st reference example. Unlike the bypass pipe 185 in FIG. 1, the bypass pipe 94 connects the middle of the third connection pipe 183 to the middle of the fourth connection pipe 184.

  According to the second reference example, the air entrainment in the reserve tank 91 generated in the first reference example is reduced. However, in the second reference example, the flow resistance of the bypass pipe 94 is much smaller than the flow resistance when the coolant passes through the reserve tank 91, so that most of the coolant that has flowed out of the radiator 14 is reserved in the reserve tank. It flows to the bypass pipe 94 instead of 91. As a result, the gas-liquid separation function of the reserve tank 91 is hardly exhibited in the cooling system 93. Therefore, in the cooling system 93 of the second reference example, when the coolant is exchanged in the market or the like, there is a situation in which the air can not be sufficiently removed from the coolant in the circulation circuit of the coolant 93. Occur.

  Based on this, the cooling system 10 and the reserve tank 16 of the present embodiment are configured as described above.

  According to the present embodiment, as shown in FIG. 2, the reserve tank 16 is provided with a first tank outlet 16b and a second tank outlet 16c. The second tank outlet 16c is arranged such that the path length of the second circulation path FL2 is shorter than the path length of the first circulation path FL1. As a result, the coolant that has entered the tank body 28 from the tank inlet 16a is divided into the first flow path FL1 and the second flow path FL2. Then, the flow rate of the coolant flowing through the first flow path FL1 having the longer path length is suppressed, and accordingly, the ripples of the liquid levels 28e, 28f, 28g, and 28h in the tank main body 28 are, for example, the first reference. It becomes smaller than the reserve tank 91 (see FIG. 3) of the example.

  Furthermore, since there are a plurality of tank outlets 16b and 16c, the flow rate of the coolant per tank outlet becomes smaller than that of the reserve tank 91 of the first reference example without the second tank outlet 16c, for example. In other words, the coolant is sucked weakly from the tank main body 28 per tank outlet. As a result, even if the circulating flow rate of the coolant in the cooling system 10 increases, for example, it is possible to suppress the entrainment of air into the coolant as compared with the reserve tank 91 of the first reference example.

  In the present embodiment, since the second tank outlet 16c is connected to the first liquid storage chamber 28a, unlike the second reference example (see FIG. 5), all the coolant flowing out of the radiator 14 is reserved. The tank 16 once flows into the tank body 28 of the reserve tank 16 without bypassing the tank 16. Then, after the coolant flows into the tank body 28, the coolant flows separately into the first flow path FL1 and the second flow path FL2.

  Therefore, the flow rate of the coolant flowing through the first flow path FL1 can be made large enough to sufficiently exhibit the gas-liquid separation function of the reserve tank 16. Accordingly, it is possible to avoid a situation in which the air cannot be sufficiently removed from the cooling system 10.

  Further, according to the present embodiment, as shown in FIGS. 1 and 2, the coolant flowing to the bypass pipe 185 flows to the bypass pipe 185 after entering the first liquid storage chamber 28a of the reserve tank 16, so It is possible to perform air bleeding not only in the first distribution path FL1 but also in the second distribution path FL2.

  Further, according to the present embodiment, the number of communication paths 281a, 282a, 283a through which the coolant flowing through the second circulation path FL2 of the reserve tank 16 passes is the number of communication paths 281a through which the coolant flowing through the first circulation path FL1 passes. Less than the number of 282a and 283a. Also by this, as described above, the undulation of the liquid level in the tank main body 28 is reduced, and the flow rate of the cooling liquid per tank outlet is reduced. Therefore, even if the circulating flow rate of the cooling liquid in the cooling system 10 is increased, it is possible to suppress the entrainment of air into the cooling liquid as compared with the reserve tank 91 of the first reference example, for example.

  Further, according to the present embodiment, in the reserve tank 16, the second tank outlet 16c communicates with the specific liquid storage chamber 28x below the specific outlet 28z. Accordingly, since the air in the coolant is directed upward, most of the air mixed in the coolant flows along the first flow path FL1 instead of the second flow path FL2. Further, since the first distribution path FL1 has a long path length, the gas-liquid separation function is higher than that of the second distribution path FL2. From these points, for example, contrary to the present embodiment, the second tank outlet 16c is in communication with the specific liquid storage chamber 28x above the specific outlet 28z, compared with the case where the air to the cooling liquid is present. It is possible to further suppress the entrainment.

  Further, according to the present embodiment, in the reserve tank 16, the second tank outlet 16c communicates with the specific liquid storage chamber 28x below the specific inlet 28y. Accordingly, the flow of the coolant from the tank inlet 16a toward the second tank outlet 16c is downward in the specific liquid storage chamber 28x. That is, the flow of the coolant is opposite to air (for example, bubbles) that moves upward in the coolant. Thereby, it is possible to enhance the effect of suppressing the entrainment of air into the coolant.

  Further, according to the present embodiment, since the tank outlets 16b and 16c are larger than in the first reference example, the flow rate of the coolant in the tank main body portion 28 is decreased. Therefore, it is possible to suppress the water flow resistance of the reserve tank 16. In other words, the effect of increasing the flow rate of the coolant circulating through the cooling system 10 can be obtained without changing the capacity of the water pump 12.

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, differences from the first embodiment will be mainly described. Further, the same or equivalent parts as those of the above-described embodiment will be described by omitting or simplifying them. The same applies to a third embodiment described later.

  FIG. 6 is a cross-sectional view showing the internal structure of the reserve tank 16 of the present embodiment, and corresponds to FIG. 2 of the first embodiment. As shown in FIG. 6, in the reserve tank 16 of the present embodiment, the second tank outlet 16c is connected to the bottom surface of the first liquid storage chamber 28a with respect to the first liquid storage chamber 28a. This embodiment is different from the first embodiment in this point.

  In the present embodiment, the effects produced from the configuration common to the first embodiment described above can be obtained as in the first embodiment.

(Third embodiment)
Next, a third embodiment will be described. In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 7 is a cross-sectional view showing the internal structure of the reserve tank 16 of the present embodiment, and corresponds to FIG. 2 of the first embodiment. As shown in FIG. 7, in the reserve tank 16 of the present embodiment, the second tank outlet 16c is connected to the second liquid storage chamber 28b instead of the first liquid storage chamber 28a. This embodiment is different from the first embodiment in this point.

  Accordingly, in the present embodiment, the second liquid storage chamber 28b corresponds to the specific liquid storage chamber 28x, the first communication path 281a corresponds to the specific inflow port 28y, and the second communication path 282a corresponds to the specific outflow port 28z. .

  In the reserve tank 16, the second tank outlet 16c communicates with the specific liquid storage chamber 28x below the specific outlet 28z, and the second tank outlet 16c is more than the specific inlet 28y. The point that it communicates with the specific liquid storage chamber 28x on the lower side is the same as that of the first embodiment in this embodiment.

  In the present embodiment, the effects produced from the configuration common to the first embodiment described above can be obtained as in the first embodiment.

(Other embodiments)
(1) In each of the embodiments described above, the tank body 28 has three internal partition walls 281, 282, 283, but the number of the internal partition walls 281, 282, 283 is not limited. For example, the inner partition walls 281, 282, and 283 may be omitted, or one, two, or four or more.

  Further, the number of communication passages 281a, 282a, 283a formed in the internal partition walls 281, 282, 283 is not limited. For example, if there are no internal partition walls 281, 282, 283, there are no communication paths 281a, 282a, 283a. If the number of the internal partition walls 281, 282, and 283 is four, four or more communication paths 281 a, 282 a, and 283 a are provided. When there are no internal partition walls 281, 282, 283, the liquid storage chambers 28a, 28b, 28c, 28d become one.

  (2) In each of the above-described embodiments, the tank body 28 has a rectangular parallelepiped shape as shown in FIG. 2, for example, but the shape of the tank body 28 is not limited. Even if the tank body 28 has a shape different from that of the first embodiment, the same effect as that of the first embodiment can be obtained.

  For example, the tank body 28 of the reserve tank 16 may have a circular cross section as shown in FIG. Alternatively, the tank body 28 may have a trapezoidal cross section as shown in FIG.

  (3) In each embodiment described above, the reserve tank 16 is provided with two tank outlets 16b and 16c, but the number of tank outlets 16b and 16c may be three or more. For example, the reserve tank 16 may be configured as shown in FIG.

  In the reserve tank 16 of FIG. 10, in addition to the first tank outlet 16b and the second tank outlet 16c, a third tank outlet 16d for allowing the coolant to flow out from the tank body 28 is provided. The third tank outlet 16d is formed in the third outlet 36 of the reserve tank 16, and is connected to the first liquid storage chamber 28a. When three or more tank outlets 16b, 16c, and 16d are provided in the reserve tank 16 as shown in FIG. 10, the effect of suppressing the air from entering the coolant in the tank main body 28 correspondingly. You can get bigger.

  In the reserve tank 16 of FIG. 10, one of the two outlets 16c and 16d connected to the first liquid storage chamber 28a is handled as the second tank outlet, and the other is handled as the third tank outlet. It only has to be. That is, any of the two outlets 16c and 16d may be handled as the second tank outlet.

  (4) In each of the above-described embodiments, the plurality of liquid storage chambers 28a, 28b, 28c, 28d of the reserve tank 16 are formed by partitioning the tank body 28 into a plurality of internal partition walls 281, 282, 283. Yes. In this regard, the plurality of liquid storage chambers 28a, 28b, 28c, 28d may be formed without depending on the internal partition walls 281, 282, 283.

  For example, the tank body 28 of the reserve tank 16 may be composed of a plurality of small tanks, and the liquid storage chambers 28a, 28b, 28c, 28d may be formed in the individual small tanks. In this case, since there are no internal partition walls 281, 282, 283, the communication paths 281a, 282a, 283a connecting the liquid storage chambers 28a, 28b, 28c, 28d are formed by, for example, a piping member.

  The present invention is not limited to the above-described embodiment, and includes various modifications and modifications within an equivalent range. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case. In each of the above embodiments, when referring to the material, shape, positional relationship, etc. of the constituent elements, etc., unless otherwise specified, or in principle limited to a specific material, shape, positional relationship, etc. The material, shape, positional relationship, etc. are not limited.

(Summary)
According to the first aspect shown in part or all of each of the above embodiments, the second tank outlet is longer than the path length of the first flow path from the tank inlet to the first tank outlet. The liquid is arranged so that the path length of the second flow path from the tank inlet to the second tank outlet is shorter.

  According to the second aspect, the plurality of liquid storage chambers are connected to each other via one or a plurality of communication paths. The number of communication paths through which the liquid flowing through the second flow path passes is smaller than the number of communication paths through which the liquid flowing through the first flow path passes. As a result, as in the first aspect, the undulation of the liquid level in the tank main body is reduced, and the liquid flow rate per tank outlet is reduced. Therefore, even when the circulation flow rate of the liquid increases in the circulation circuit including the reserve tank, it is possible to suppress the entrainment of air into the liquid as compared with, for example, the reserve tank of Patent Document 1.

  According to the third aspect, the second tank outlet is connected to a specific liquid storage chamber that is one of a plurality of liquid storage chambers. The second tank outlet is in communication with the specific storage chamber below the specific outlet through which the liquid flows out from the specific storage chamber in the first tank outlet and the communication path. Therefore, since the air in the liquid moves upward, most of the air mixed in the liquid flows along the first circulation path instead of the second circulation path. Moreover, since the path length is long in the first distribution path, the gas-liquid separation function is higher than that in the second distribution path. From these points, conversely, for example, it is possible to further suppress the entrainment of air into the liquid as compared with the case where the second tank outlet is in communication with the specific storage chamber above the specific outlet. is there.

  Further, according to the fourth aspect, the second tank outlet is located below the specific inlet that allows the liquid to flow into the specific reservoir in the tank inlet and the communication path. Communicate. Therefore, the liquid flow from the tank inlet to the second tank outlet is downward in the specific liquid storage chamber. That is, the liquid flow is opposite to air (for example, bubbles) moving upward in the liquid. Thereby, it is possible to enhance the effect of suppressing the entrainment of air into the liquid.

16 reserve tank 16a tank inlet 16b first tank outlet 16c second tank outlet 28 tank body part 30 inlet part 31 first outlet part 32 second outlet part FL1 first flow path FL2 second flow path

Claims (4)

A tank body (28) for storing liquid;
An inlet part (30) formed with a tank inlet (16a) for allowing the liquid to flow into the tank body part;
A first outlet part (31) formed with a first tank outlet (16b) for allowing the liquid to flow out of the tank body part;
A second outlet (32) formed with a second tank outlet (16c) for allowing the liquid to flow out of the tank body,
The second tank outlet is configured such that the liquid flows from the tank inlet to the second tank outlet more than a path length of a first flow path (FL1) from the tank inlet to the first tank outlet. The reserve tank arrange | positioned so that the path | route length of the 2nd distribution path (FL2) leading to may become short. A plurality of liquid storage chambers (28a, 28b, 28c, 28d) for storing the liquid and one or a plurality of communication paths (281a, 282a, 283a) are formed in the tank main body portion,
The plurality of liquid storage chambers are connected to each other via the one or more communication paths,
2. The reserve tank according to claim 1, wherein the number of the communication paths through which the liquid flowing through the second flow path passes is smaller than the number of the communication paths through which the liquid flowing through the first flow path passes.   The second tank outlet is connected to a specific liquid storage chamber (28x) that is one of the plurality of liquid storage chambers, and the specific liquid storage chamber of the first tank outlet and the communication path. The reserve tank according to claim 2, wherein the reserve tank communicates with the specific liquid storage chamber below a specific outlet (28z) through which the liquid flows out from the tank.   The second tank outlet communicates with the specific liquid storage chamber below a specific inlet (28y) through which the liquid flows into the specific liquid storage chamber in the tank inlet and the communication path. The reserve tank according to claim 3.

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