JP2006183943A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the efficiency of heat transfer between a heat medium and a heat storage material in an accumulator. <P>SOLUTION: The interior of a heat storage container 41 having a heat insulating function using a vacuum part 44 is divided into a first chamber 46 and a second chamber 47 by a partition member 45. A plurality of heat transfer members 48 are provided across the first chamber 46 and the second chamber 47 in such a manner as to penetrate the partition member 45. An opening 41a in the heat storage container 41 is closed by a cap 51. A water pipe 53 and a distributing pipe 54 for feeding engine cooling water to the first chamber 46 are provided. The second chamber 47 is filled with the heat storage material 49. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat storage device that stores heat of a heat medium such as cooling water or oil.

  In a general water-cooled engine, a water jacket is provided in the engine as a cooling water passage, and the engine cooling water is circulated through the water jacket so that the entire engine is uniformly cooled. However, when the engine is cold-started, the low-temperature engine coolant circulates through the water jacket, and the engine cannot be warmed up early. In this case, the wall temperature of the intake port of the engine, the combustion chamber, and the like is lowered, so that the fuel is difficult to atomize, and the startability and exhaust emission are deteriorated.

  Therefore, conventionally, in a water-cooled engine, the heat of the engine cooling water is temporarily stored in the heat storage tank, and when the engine is cold started, the hot engine cooling water in the heat storage tank is transferred to the engine water jacket. A heat storage device has been proposed in which the engine is warmed up early by being circulated.

  In addition, as what heats engine oil or engine cooling water, there exist some which were described in the following patent document 1, for example. The “heat storage device” described in the following Patent Document 1 is provided with an engine oil (engine) that is provided with a latent heat heat storage material of a latent heat of fusion type through a passage around a container in which a salt hydrate heat storage material is accommodated. When the temperature drops after the salt hydrate heat storage material stores the heat of the cooling water, the latent heat of fusion stored in the heat insulation heat storage material is gradually released, and the temperature drop of the salt hydrate heat storage material is suppressed. is there.

JP-A-6-050121

  In patent document 1 mentioned above, while the heat | fever of the high temperature engine oil (engine cooling water) which flows through a channel | path is transmitted to a salt hydrate heat storage material through a container, and is heat-stored, the heat stored by the salt hydrate heat storage material Is transmitted to the low-temperature engine oil (engine cooling water) flowing through the passage through the container and heated. Therefore, the amount of heat transfer per hour is not sufficient, the engine oil (engine cooling water) cannot be heated, that is, the engine cannot be warmed up in a short time, and the engine startability and exhaust emission are sufficiently improved. I can't.

  This invention is for solving such a problem, Comprising: It aims at providing the thermal storage apparatus aiming at the improvement of the heat transfer efficiency between a thermal medium and a thermal storage material.

  In order to solve the above-described problems and achieve the object, a heat storage device of the present invention includes a heat storage container having a heat insulation function, a partition member that partitions the heat storage container into a first chamber and a second chamber, A heat medium supply unit for supplying a heat medium to one chamber; a heat medium discharge unit for discharging the heat medium from the first chamber; a heat storage material filled in the second chamber; And a heat transfer member provided over the first chamber and the second chamber.

  Further, in the heat storage device of the present invention, the heat transfer member is branched from the main line portion, and a main line portion in which an intermediate portion is supported by the partition member and each end portion is located in the first chamber and the second chamber. And a double-wire portion extending to the first chamber and the second chamber.

  In the heat storage device of the present invention, the heat transfer member is made of carbon fiber.

  The heat storage device of the present invention is characterized in that a heat insulating material is additionally provided in the partition member.

  In the heat storage device of the present invention, the heat storage container is formed with an opening having substantially the same diameter as the inner diameter at one end, and the partition member supporting the heat transfer member is inserted from the opening to A cap that is fitted and fixed at a predetermined position and in which the heat medium supply unit and the heat medium discharge unit are formed is fixed to the opening.

  According to the heat storage device of the present invention, the inside of the heat storage container having a heat insulating function is partitioned into the first chamber and the second chamber by the partition member, and the heat medium supply unit and the heat medium discharge unit are provided in the first chamber, Since the two chambers are filled with the heat storage material and the heat transfer member is provided across the first chamber and the second chamber through the partition member, the high-temperature heat medium supplied from the heat medium supply unit to the first chamber of the heat storage container The heat is transferred to the heat storage material in the second chamber by the heat transfer member and stored, while the heat stored in the heat storage material is transferred to the low-temperature heat medium in the first chamber by the heat transfer member. The heat medium becomes high temperature and the heat medium is discharged from the heat medium discharge part to the outside of the heat storage container, and by using a heat transfer member that directly contacts the heat medium and the heat storage material, the heat storage amount and the heat dissipation amount can be reduced. It is possible to increase the heat transfer efficiency between the heat medium and the heat storage material.

  Below, the Example of the thermal storage apparatus which concerns on this invention is described in detail based on drawing. Note that the present invention is not limited to the embodiments.

  1 is a cross-sectional view of a heat storage device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1, and FIG. 3 is an engine during operation of the heat storage device of this embodiment. FIG. 4 is a schematic diagram showing an engine cooling device to which the heat storage device of this embodiment is applied.

  The vehicle of the present embodiment is a hybrid vehicle having a power train that uses a combination of two types of power sources, a gasoline engine and an electric motor. Therefore, when the ignition key switch is turned on, if the temperature of the engine coolant is below a predetermined temperature, the engine starts, and when starting or running at low speed, the engine is stopped and the vehicle is driven by an electric motor. The vehicle is driven by the engine or the electric motor, and is controlled to run by the engine and the electric motor when the load is high.

  First, an engine cooling device mounted on the hybrid vehicle described above will be described. In the engine cooling apparatus to which the heat storage device of this embodiment is applied, as shown in FIG. 4, the engine 11 is a water-cooled in-line four-cylinder engine, and is configured by a cylinder head 13 being fastened to the upper part of a cylinder block 12. In the cylinder block 12, four cylinders 14 are formed in series. The cylinder block 12 is formed with a water jacket 15 positioned around each cylinder 14, while the cylinder head 13 is also provided with a water jacket 15 so as to avoid intake ports and intake ports (not shown). A water jacket 16 connected to the jacket 15 is formed.

  A mechanical water pump 17 driven by the engine 11 is mounted on the inlet side of the water jacket 15 of the cylinder block 12, and a thermostat valve 18 is mounted on the suction side of the water pump 17. Therefore, the engine coolant can be supplied to the water jackets 15 and 16 of the cylinder block 12 and the cylinder head 13 and circulated by the water pump 17.

  A proximal end portion of the first cooling water circulation passage 19 is connected to the outlet side of the water jacket 16 of the cylinder head 13, and a distal end portion of the first cooling water circulation passage 19 is connected to the radiator 20. The thermostat valve 18 is connected via the second cooling water circulation passage 21. A reservoir tank 23 is connected to the radiator 20 via a connecting passage 22. A proximal end portion of the bypass passage 24 is connected to the outlet side of the water jacket 16, and a distal end portion of the bypass passage 24 is connected to the thermostat valve 18. Further, a proximal end portion of the first heater passage 25 is connected to the outlet side of the water jacket 16, and a distal end portion of the first heater passage 25 is connected to the heater core 26, and the heater core 26 is connected to the second heater passage 25. 27 is connected to the thermostat valve 18.

  The thermostat valve 18 opens and closes according to the temperature of the engine coolant. A temperature sensor 28 that detects the temperature of the engine coolant flowing in the engine 11 is provided at the outlet of the water jacket 16 of the cylinder head 13. Is provided. Accordingly, when the temperature of the engine coolant detected by the temperature sensor 28 is equal to or lower than a predetermined temperature, such as immediately after the engine 11 is started at the thermostat valve 18, the thermostat valve 18 communicates with the bypass passage 24 and after a predetermined time has elapsed since the start of the engine 11. When the temperature of the engine cooling water is higher than a predetermined temperature, the engine cooling water communicates with the second cooling water circulation passage 21.

  The engine 11 stores heat of the high-temperature engine cooling water when the engine cooling water is high temperature, and heats the low-temperature engine cooling water by the stored heat when the engine cooling water is low temperature. A heat storage device is provided. Here, the heat storage device of the present embodiment will be described in detail.

  That is, in the heat storage device of this embodiment, a preheating passage 29 is provided so as to bypass the heater core 26 by connecting the middle portion of the first heater passage 25 and the middle portion of the second heater passage 27. 29 is provided with a heat storage tank 30. A switching valve 31 is provided at the connecting portion between the first heater passage 25 and the preheating passage 29, and an electric water pump 32 is provided on the preheating passage 29 on the second heater passage 27 side.

  In this heat storage tank 30, as shown in FIG.1 and FIG.2, the heat storage container 41 superposes | stacks the outer container 42 and the inner container 43 with a predetermined clearance gap, and the edge part is being fixed by welding. By making the vacuum part 44 between 42 and the inner container 43, it has a heat insulation function. And this heat storage container 41 is formed so that the opening part 41a is formed in one end part, and it becomes the same diameter from this opening part 41a to the inside.

  Inside the heat storage container 41, a partition member 45 is fixed at an intermediate portion in the longitudinal direction, so that the inside is partitioned into a first chamber 46 and a second chamber 47, and a plurality of heat transfer members 48 are divided into the partition members. By passing through 45, each heat transfer member is provided across the first chamber 46 and the second chamber 47. The heat transfer member 48 is made of carbon fiber, and is composed of a main line portion 48a and a plurality of multiple wire portions 48b. The main line portion 48 a has a predetermined thickness, an intermediate portion is supported by the partition member 45, and respective end portions are located in the first chamber 46 and the second chamber 47. The double line portion 48b is narrower than the main line portion 48a, and is branched from the main line portion 48a so as to extend to the sides of the first chamber 46 and the second chamber 47.

  The second chamber 47 is filled with a heat storage material 49 and sealed in the heat storage container 41 by a partition member 45. This heat storage material 49 is a latent heat storage material capable of storing a larger amount of heat than engine cooling water. In addition, a heat insulating material 50 is provided on the first chamber 46 side of the partition member 45, and has a heat retaining effect on the heat storage material 49 in the second chamber 47.

  On the other hand, engine coolant (heat medium) can be supplied to and discharged from the first chamber 46, and a urethane cap 51 is fitted via an O-ring 52 so as to close the opening 41 a of the heat storage container 41. ing. A water supply pipe (heat medium supply unit) 53 for supplying engine cooling water from the outside to the first chamber 46 is mounted on the cap 52 and a water distribution pipe for discharging engine cooling water from the first chamber 47 to the outside. A (heat medium discharge unit) 54 is mounted. The water supply pipe 53 has a plurality of water supply openings 53 a formed at one end and is inserted into the first chamber 46. On the other hand, the water distribution pipe 54 has a plurality of drain openings 54 a formed at one end thereof and is inserted into the first chamber 46. The other end of the water supply pipe 53 is connected to the water pump 32 side in the preheating passage 29 (see FIG. 4), and the other end of the water distribution pipe 54 is connected to the switching valve 31 in the preheating passage 29 (see FIG. 4). )

  The heat storage container 41 is formed so as to have the same diameter from the opening 41a to the inside. First, a predetermined amount of the heat storage material 49 is filled therein, and in this state, the plurality of heat transfer members 48 penetrate. The partition member 45 and the heat insulating material 50 are inserted into the heat storage container 41 through the opening 41a and fitted to the inner peripheral surface, and the partition member 45 and the heat insulating material 50 are welded to the heat storage container 41 at a predetermined position. Fix it. Finally, a cap 51 fitted with a water supply pipe 53 and a water distribution pipe 54 is fitted into the opening 41 a of the heat storage container 41 via an O-ring 52. In this way, the heat storage tank 30 is manufactured.

  Accordingly, when the high-temperature engine cooling water is supplied to the water supply pipe 53, the engine cooling water is supplied from the water supply opening 53a to the first chamber 46 of the heat storage container 41. At this time, a large amount of heat is generated from the high-temperature engine cooling water. The heat transfer member 48 transmits the heat to the heat storage material 49 of the second chamber 47, and the heat storage material 49 can efficiently store heat. Then, the engine cooling water exchanged in the first chamber 46 enters the water distribution pipe 54 through the drain opening 54 a and is discharged to the outside through the water distribution pipe 54. On the other hand, when low-temperature engine cooling water is supplied to the water supply pipe 53, such as when the engine 11 is started, the engine cooling water is supplied from the water supply opening 53a to the first chamber 46 of the heat storage container 41. The heat stored in the heat storage material 49 in the chamber 47 is transmitted to the low-temperature engine cooling water in the first chamber 46 by the multiple heat transfer members 48, so that the engine cooling water can be efficiently heated. The engine coolant that has become hot due to heat exchange in the first chamber 46 enters the water distribution pipe 54 through the drain opening 54 a and is discharged to the outside through the water distribution pipe 54.

  Here, control of the engine cooling device to which the heat storage device of the present embodiment is applied will be described. As shown in FIG. 4, when the engine 11 is warmed up, the temperature of the engine cooling water is higher than a predetermined temperature, and the thermostat valve 18 connects the second cooling water circulation passage 21 and the second heater passage 27 to the water jacket. It communicates with the 15 and 16 side. Accordingly, the engine coolant is supplied from the water jacket 15 of the cylinder block 12 to the water jacket 16 of the cylinder head 13 by the water pump 17 as shown by the solid line in FIG. The high-temperature engine cooling water discharged from the water jacket 16 of the cylinder head 13 is circulated from the first cooling water circulation passage 19 to the radiator 20 and cooled there. Further, the high-temperature engine cooling water discharged from the water jacket 16 of the cylinder head 13 is circulated from the first heater passage 25 to the heater core 26 and contributes to heating.

  Further, by driving the water pump 32 mounted in the preheating passage 29, high-temperature engine cooling water is circulated in the heat storage tank 30. Then, as shown in FIG. 1, the high-temperature engine cooling water is supplied to the first chamber 46 of the heat storage container 41 through the water supply pipe 53, and the heat of the high-temperature engine cooling water is supplied to the second chamber 47 by the multiple heat transfer members 48. The heat storage material 49 is transmitted to and stored in the heat storage material 49. Therefore, after the engine 11 is stopped, a large amount of heat is stored in the heat storage material 49 in the heat storage tank 30 even if the engine coolant in the water jackets 15 and 16 has a low temperature.

  When the driver turns on the ignition key switch to start the engine 11, if the temperature of the engine coolant in the water jacket 16 detected by the water temperature sensor 28 is equal to or lower than a predetermined temperature, the engine 11 is started. Before starting, preheat the engine coolant.

  That is, the water pump 32 attached to the preheating passage 29 is driven, and the passage on the water jacket 16 side of the cylinder head 13 in the first heater passage 25 and the preheating passage 29 are communicated with each other by the switching valve 31. As shown by the dotted line, the high-temperature engine coolant in the heat storage tank 30 is circulated to the water jacket 16 of the cylinder head 13 through the preheating passage 29 and the first heater passage 25. In this case, the low-temperature cooling water is supplied into the heat storage tank 30 by driving the water pump 32, so that the high-temperature engine cooling water in the heat storage tank 30 is sent to the preheating passage 29 as shown in FIG. The low-temperature cooling water supplied to the first chamber 46 of the heat storage container 41 receives heat from the heat storage material 49 of the second chamber 47 via a large number of heat transfer members 48 and is sent out at a high temperature.

  Only the electric water pump 32 of the preheating passage 29 is driven and the mechanical water pump 17 of the engine 11 is stopped, so that the water pump 32, the heat storage tank 30, the preheating passage 29, and the first heater passage are provided. 25, the engine water coolant flows in the order of the water jacket 16, the water jacket 15, the water pump 17, the thermostat valve 18, the second heater passage 27, and the water pump 32. Therefore, the high-temperature engine coolant is circulated through the water jackets 15 and 16 of the engine 11 before starting, and the engine 11 can be heated in advance.

  Thereafter, when the engine 11 is started, the driving of the water pump 32 is stopped, and the flow of the first heater passage 25 from the water jacket 16 side of the cylinder head 13 to the heater core 26 side is enabled by the switching valve 31. The valve 18 is in communication with the bypass passage 24. Then, the engine coolant flows in the order of the water pump 17, the water jacket 15, the water jacket 16, the bypass passage 24, the thermostat valve 18, and the water pump 17 as indicated by a solid line in FIG. 4. In this case, the engine 11 is preheated by circulating high-temperature engine cooling water heated by the heat storage tank 30 in each passage, and warming up of the engine 11 can be promoted.

  In FIG. 3, the glass showing the temperature change of engine cooling water when the engine 11 by the heat storage tank 30 of a present Example is preheated is shown. As can be seen from the graph of FIG. 3, in the heat storage tank 30 of the present embodiment having the heat transfer member 48, the temperature of the engine coolant supplied to the engine 11 gradually decreases after the preheating is started. However, in the conventional heat storage tank that does not have the heat transfer member 48, the temperature of the engine cooling water supplied to the engine 11 after the preheating is started rapidly decreases in a short time.

  As described above, in the heat storage device of the present embodiment, the interior of the heat storage container 41 having a heat insulating function is partitioned by the vacuum part 44 into the first chamber 46 and the second chamber 47 by the partition member 45, and a plurality of heat transmissions are performed. A member 48 is provided through the partitioning member 45 so as to extend over the first chamber 46 and the second chamber 47, and the opening 41 a of the heat storage container 41 is closed by the cap 51, and the engine cooling water supply pipe 53 and the distribution to the first chamber 46 are arranged. While the water pipe 54 is provided, the second chamber 47 is filled with a heat storage material 49.

  Therefore, the heat of the high-temperature engine cooling water supplied from the water supply unit 53 to the first chamber 46 of the heat storage container 41 is transmitted to the heat storage material 49 of the second chamber 47 by the plurality of heat transfer members 48 to store heat. On the other hand, the heat stored in the heat storage material 49 can be transmitted to the low-temperature heat medium in the first chamber 46 by each heat transfer member 48 to heat it, and directly to the engine coolant and the heat storage material 49. By using the heat transfer member 48 in contact, the heat storage amount and the heat release amount can be increased, and the heat transfer efficiency between the engine coolant and the heat storage material 49 can be improved.

  As a result, the heat of the engine cooling water after the engine 11 is warmed up is stored in the heat storage tank 30, and the engine cooling water is heated by the heat stored in the heat storage tank 30 before the engine is started. Warming up the engine 11 can be promoted by sending it to The engine startability and exhaust emission can be improved by warming up the engine in a short time.

  Moreover, since the heat transfer member 49 is made of carbon fiber, the heat transfer efficiency can be increased, and the workability can be improved. In addition, since the heat transfer member 48 includes the main line portion 48a and the multiple wire portions 48b, the heat transfer area can be expanded, and the heat transfer efficiency can also be improved in this respect.

  Furthermore, by forming the heat storage container 41 so as to have the same diameter from the opening 41a to the inside, after the plurality of heat transfer members 48 are supported by the partition member 45 and the heat insulating material 50, the heat storage container 41 is formed from the opening 41a. By inserting and fitting in the heat storage container 41, the heat transfer member 48 can be easily arrange | positioned in the heat storage container 41, and assembly | attachment property can be improved and work cost can be reduced.

  In the above-described embodiment, the heat transfer member 48 is made of carbon fiber. However, the heat transfer member 48 is not limited to this embodiment, and instead of carbon fiber as having high heat transfer efficiency, for example, it may be made of copper. Good. In addition, the transmission member 48 is configured by branching the double wire portion 48b from the main wire portion 48a. However, the shape is not limited to the embodiment, and the main wire portion penetrates a plurality of double wire portions forming a spider web shape. You may make it comprise.

  Further, in this embodiment, the heat storage tank 30 is mounted on the vehicle in a horizontal state, but it may be mounted in a standing state with the heat storage material 49 side as the upper side. In this case, the engine cooling on the water supply pipe 53 and the water distribution pipe 54 side is possible. Since the temperature of water becomes low, the heat storage efficiency is further improved.

  In this embodiment, the heat storage device of the present invention is applied to preheat engine cooling water in a hybrid vehicle. However, the present invention can also be applied to a device that preheats engine cooling water in a vehicle having only the engine as a power train. In this case, preheating may be started by unlocking the door lock or opening the door. In addition, the engine cooling water is preheated using the heat storage device of the present invention as a heat medium, but engine oil, mission oil, etc. can be preheated, and can be used not only in the engine but also in other fields. it can.

  As described above, the heat storage device according to the present invention is intended to improve heat transfer efficiency by providing a heat transfer member over the heat medium and the heat storage material partitioned in the heat storage container. It is useful when applied to a heat storage device that stores heat of a heat medium such as oil.

It is sectional drawing of the thermal storage apparatus which concerns on one Example of this invention. It is sectional drawing along the II-II line of FIG. It is a graph showing the temperature change of the engine cooling water at the time of the action | operation of the thermal storage apparatus of a present Example. It is the schematic showing the cooling device of the engine to which the heat storage apparatus of a present Example was applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Engine 12 Cylinder block 13 Cylinder head 15, 16 Water jacket 17 Water pump 18 Thermostat valve 20 Radiator 24 Bypass passage 25 1st heater passage 26 Heater core 27 2nd heater passage 28 Temperature sensor 29 Preheating passage 30 Heat storage tank 31 Switching valve 32 Water Pump 41 Heat storage container 45 Partition member 46 First chamber 47 Second chamber 48 Heat transfer member 48a Main line portion 48b Double wire portion 49 Heat storage material 50 Heat insulation material 51 Cap 53 Water supply pipe (heat medium supply section)
54 Water distribution pipe (heat medium discharge part)

Claims (5)

  A heat storage container having a heat insulation function, a partition member that divides the heat storage container into a first chamber and a second chamber, a heat medium supply unit that supplies a heat medium to the first chamber, and a heat medium from the first chamber A heat medium discharge portion for discharging the heat storage material, a heat storage material filled in the second chamber, and a heat transfer member provided through the partition member and extending over the first chamber and the second chamber. A heat storage device.   2. The heat storage device according to claim 1, wherein the heat transfer member is branched from the main line portion, a main line portion in which an intermediate portion is supported by the partition member and each end portion is positioned in the first chamber and the second chamber. And a double wire portion extending to the first chamber and the second chamber.   The heat storage device according to claim 1, wherein the heat transfer member is made of carbon fiber.   The heat storage device according to claim 1, wherein a heat insulating material is additionally provided on the partition member.   2. The heat storage device according to claim 1, wherein the heat storage container has an opening formed at one end substantially the same diameter as the inner diameter, and the partition member supporting the heat transfer member is inserted through the opening. A heat storage device characterized by being fitted and fixed at a predetermined position on a peripheral surface, and a cap on which the heat medium supply unit and the heat medium discharge unit are formed fixed to the opening.

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