JPH0688688A - Heat accumulating apparatus - Google Patents

Abstract

PURPOSE:To reduce a heat loss in a heat accumulating apparatus for waste heat in an internal combustion engine by a method wherein a heat transfer medium supplying conduit and a heat transfer medium discharging conduit are formed by ceramic material. CONSTITUTION:An inner casing 51 is arranged to wind around a core 40 of a heat accumulating device. An outer casing 50 is installed in a spaced apart relation with an outside part of the inner casing 51. A thermal insulating region 41 is formed between the inner casing 51 and the outer casing 50. A heat transfer medium supplying conduit 17 for feeding the heat transfer medium and a heat transfer medium discharging conduit 18 for discharging heat transfer medium against the heat accumulating core 40 are arranged within the inner easing 51 and passed through the outer casing 50 to project outwardly. The discharging conduit 18 is constructed by a metallic pipe 61 closely fitted and fixed to an inner circumferential surface of a fixing hole of the inner easing 51, a metallic bellows pipe 62 at a thermal insulated region 41, and a ceramic pipe 60 connected to the metallic bellows 62, closely fitted and fixed to an inner circumferential surface of a fixing hole of the outer casing 50. The supplying conduit 17 is also similarly constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage device for storing waste heat of an internal combustion engine and using it for preheating at the time of starting or for heating the inside of a vehicle. More specifically, the present invention relates to a heat storage core for storing a heat storage agent and an outer container. And a structure of a heat transfer medium supply and discharge conduit in a heat storage device comprising

[0002]

2. Description of the Related Art In an internal combustion engine such as an automobile engine, about one third of the combustion energy of gasoline is used as a driving force,
Normally, about two-thirds of energy is not used effectively and is wasted as waste heat. Therefore, a part of this waste heat is stored as heat storage through a cooling medium of the engine, and this heat is stored as needed, for example, during the winter period, when heating the vehicle interior before starting the engine and by preheating the engine intake part. A heat storage device has been proposed for effective use for improvement.

The principle of the heat storage device is that the heat of the cooling liquid (heat transfer medium) for cooling the combustion heat in the engine is a heat storage agent, that is, the specific heat of the solid phase and the liquid phase is large, and the heat transfer during cooling is performed. It stores heat in a material that undergoes a phase transition from a solid phase to a liquid phase within the medium temperature range and has a large phase transition heat. At the time of heat storage, the heat storage agent absorbs the heat of the heat transfer medium, transitions from the solid phase to the liquid phase, and further rises to the temperature of the heat transfer medium. The heat storage agent in this heated state is stored in an adiabatic state, and when the engine is started, etc., the heat of the heat storage agent itself and the transfer heat released when the heat storage agent transitions from the liquid phase to the solid phase are released. It is used via a heat transfer medium.

In a conventional heat storage device, an inner casing surrounding a regenerator core (core portion) containing a heat storage agent, an outer container surrounding the inner casing with a space, an inner casing and an outer container are provided. And a heat insulating section between the two, and a structure in which a supply conduit and a discharge conduit for a heat transfer medium carrying heat are led to the inner casing.

In the heat storage device, it is required that the heat storage state does not lose heat as much as possible. On the other hand, heat loss during heat storage of the heat storage device is mainly caused by heat dissipation from the supply conduit and discharge conduit portions of the heat transfer medium made of a metal pipe. Therefore, an object of the present invention is to provide an apparatus in which the heat loss from the metal supply conduit and discharge conduit portions of the heat transfer medium in the heat storage device is minimized.

[0006]

The present inventors have solved the above problems by using a ceramic material for the supply conduit and the exhaust conduit of the heat transfer medium in the heat storage device. Further, the inventors of the present invention use part of the heat transfer medium supply conduit and discharge conduit as a bellows tube to reduce heat loss and reduce vibration of the inner casing of the heat storage device due to vibration of the vehicle body when mounted on an automobile or the like. Was successful.

That is, according to the present invention, 1) an inner casing 51 surrounding the heat storage core 40,
An outer casing 50 surrounding the inner casing 51 at intervals, a heat insulating region 41 between the inner casing 51 and the outer casing 50, a heat transfer medium supply conduit 17 and a heat transfer medium guided conduit 18 to the heat storage core 40. In the heat storage device 1 provided with, the supply conduit 17 and the discharge conduit 1
8 is made of a ceramic material, and a heat storage device,

2) An inner casing 51 surrounding the heat accumulator core 40, an outer casing 50 surrounding the inner casing 51 with a space, a heat insulating region 41 between the inner casing 51 and the outer casing 50, and a heat accumulator. In the heat storage device 1 including a supply conduit 17 and a discharge conduit 18 for a heat transfer medium guided to a core 40, a metal pipe in which the supply conduit 17 and the discharge conduit 18 are adhered and fixed to an inner peripheral surface of a mounting hole of a heat storage core exterior. The outer casing 5 is connected to the metal bellows tube portion 62 and the metal bellows tube portion 61 of the 61 part and the heat insulating area 41 part.
The heat storage device is characterized by comprising a ceramic material tube 60 portion that is closely fixed to the inner peripheral surface of the mounting hole of No. 0.

The present invention will be described below with reference to the drawings showing the embodiments. 1 is a partially cutaway perspective view showing an outline of a heat storage device according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is an enlarged view of part B of FIG. Is. In this device, a rectangular regenerator core 40 housed in an inner casing 51 is surrounded by an outer casing 50 so that the regenerator core 40
The region 41 between the outer casing 50 and the outer casing 50 is kept in an adiabatic state (usually vacuum) in order to minimize the loss of accumulated heat.

FIG. 4 is a partially enlarged perspective view of an example of the heat storage block 38 constituting the heat storage core, and FIG. 5 is a view of FIG. 4 seen from the direction of arrow 8. The heat storage core 40 is a heat storage block 3 made of a metal material such as aluminum having good heat conduction.
It is assembled in 8. The heat storage block 38 is provided with a plurality of heat storage agent accommodating portions 5 sandwiched by a plurality of heat transfer medium passages 2, and the heat storage agent accommodating portion 5 has corrugated plates (fins) used for heat conduction on its outer wall surface. Are fixed (thermally bonded). In the cavity 6 of the heat storage agent accommodation part 5, the heat storage agent 7 which is transformed from a solid phase to a liquid phase in a specific temperature range and then crystallizes again when releasing the stored heat to return to a solid state is enclosed and stored. Has been done.

The heat storage block 38 has a rectangular shape in which the flat plate-shaped groove portions 2 serving as four heat transfer medium passages sandwich the hollow portion 6 for accommodating the heat storage agent. The cavity 6 for accommodating the heat storage agent is closed in the direction of the arrow 8, and the heat transfer medium passage 2 is divided into fine grooves 4 by a sheet metal 9 having a tubular shape and a corrugated cross section. There is. In the example shown in FIG. 5, the narrow groove 4 has a substantially trapezoidal cross section.

The cavity 6 closed between the heat transfer medium passages (grooves) 2 is shown with the upper side opened in FIG. 4, but the cavity 6 is a corrugated plate 12 which is a member for heat transfer. Is divided into a large number of grooves, and the space between the cavities 6 is kept constant. The sheet metal 9 is made of the same metal material as the groove portion 2 of the heat transfer medium passage, such as aluminum. The corrugated sheet metal 9 is easy to process, a large heat conduction area can be obtained, and the corrugated plate 9 is fixed to the wall surface of the groove portion 2 at the contact point 10 to form a good thermal bond between the two. ing.

FIG. 6 shows the heat storage block 38 as viewed from the direction of the upper portion (arrow) 11 of FIG. Similar to the passage (groove) 2 for the heat transfer medium, the hollow portion 6 for accommodating the heat storage agent 7 is divided by a corrugated sheet metal 12 into a U-shaped cross section. The corrugated plate 12 is made of the same aluminum material as the groove portion 2, and the corrugated plate 12 is fixed to the outer wall surface of the heat transfer medium passage 2 by welding or the like at the contact point 13 so that heat transfer is effectively performed.

FIG. 7 is a perspective view of an example of the heat transfer medium container (heat accumulator) 14 used as the inner casing 51 in the present invention. The two heat storage blocks are arranged in direct contact with each other and arranged around the surface. It consists of a combination of heat storage blocks that are welded and airtight from the outside. Since the heat storage block 38 has a quadrangular shape, the heat storage unit 14 in which the heat storage block 38 is combined, and hence the heat storage device, also has a quadrangular shape, which is convenient for being incorporated in an automobile having a limited space. Before closing, the cavity 6 is filled with a heated liquid heat storage agent. In the heat transfer medium container 14 of this example, the heat transfer medium flows in the narrow groove 4 of the passage 2. Heat transfer medium reservoirs 15 and 16 are provided at both ends of the heat transfer medium container 14, that is, at the inlet and outlet sides and the opposite side.

In the device of the present invention shown in FIG. 1, the inner casing 5
Three heat storage blocks 38 in which the heat storage agent 7 is vertically filled in 1 are stacked and placed, and the heat transfer medium from the introduction pipe 17 is provided with 12 passages from the storage portion 15 as indicated by arrows. Is discharged from the discharge pipe 18 via the reservoir section 16. As shown in FIG. 7, a switching valve 19 is attached to the introduction pipe 17, and using this, a cooling water (heat transfer medium) introduction pipe 20 that enters from the cooling system of the engine is connected to the pipe 21 side for the heating application system. Can be switched to.

Similarly, the outlet 18 is also provided with a switching valve 22, which can be used to switch the heat transfer medium outlet 23 from the engine cooling system to the application system tube 24. When the engine cooling system is connected in a circulating state, that is, when the high-temperature heat transfer medium is flown into the heat storage block, heat is transferred to the heat storage agent 7 contained in the cavity 6, and the heat storage agent 7 is changed from solid to liquid. The heat that changes and is transferred at the same time is stored.

Heat transfer medium supply conduit 17 and discharge conduit 18
As shown in FIG. 3 (only the discharge conduit portion is shown, the supply conduit portion is also the same), the heat storage core outer casing (inner casing) 51 and the outer casing 5 made of metal such as aluminum material.
No. 0, brazing 52, 52a on the inner peripheral surface of each mounting hole
It is fixed tightly by. Here, as the ceramic material used for the supply conduit and the discharge conduit, among the ceramics, 2MgO · 2Al ₂ O ₃ · 5S, which has a good heat insulating property, is used.
iO ₂ type cordierite ceramic and 3Al ₂ O ₃
・ 2SiO ₂ type mullite ceramic is preferable.

[0018] Such a ceramic pipe is, for example,
To braze the mounting holes of the inner and outer casings made of aluminum material, use BA 4047 described on JIS Z 3263 (aluminum alloy brazing and brazing sheet) on the outer peripheral surface corresponding to the mounting holes of the ceramic pipe. Al-Si type brazing material is applied and the pipe is set in the mounting hole and heated to 580 to 605 ° C for brazing, or a flare-shaped flare is formed near the mounting holes of the inner casing and the outer casing. This can be performed by providing a recess, setting a ring-shaped brazing material in the recess, and then attaching a pipe and heating at a high temperature.

FIG. 8 shows another embodiment of the present invention, which is shown in FIG.
FIG. 4 is a partially enlarged cross-sectional view showing a configuration of a discharge conduit portion (the same applies to a supply conduit portion) corresponding to FIG. 3 of the apparatus of FIG. In addition,
In FIG. 8, the brazing part is omitted in order to simplify the drawing. In this example, the supply conduit 17 and the discharge conduit 1
8 is composed of a metal tube 61 of aluminum or the like, a bellows tube 62 and a ceramic tube 60, and the metal tube 61 is closely fixed to the inner peripheral surface of the mounting hole of the heat accumulator core exterior (inner casing) 51. The bellows tube portion 62 is located in the heat insulating region 41, and the ceramic tube 60 is closely fixed to the inner peripheral surface of the mounting hole of the outer casing 50. In this example, the metal tube portion and the bellows tube may be integrally formed, or separate tubes may be joined by welding.

A method of closely fixing the metal tube portion to the mounting hole of the inner casing and a method of closely fixing the ceramic tube portion to the mounting hole of the outer casing are performed by the same brazing method as in the embodiment of FIG. You can do it. According to this example, part of the supply conduit and the discharge conduit (the portion of the heat insulating region) is connected to the ceramic tube as a bellows tube, so not only the heat loss is reduced but also the vibration of the outer container is absorbed by the bellows tube. Vibration of the inner container (heat storage core) is reduced, and deformation and damage of the inner container are prevented.

FIG. 9 is a perspective view of the heat storage device showing the mounting positions of the preferable supply conduit and discharge conduit according to the present invention.
That is, in the heat storage device in which the heat storage core part is thermally insulated with the vacuum region interposed, the temperature of the heat storage agent becomes higher toward the upper region in the stationary state during heat storage.
7 and the discharge conduit 18 are provided in the lower part where the temperature of the heat storage agent is low to further reduce heat loss.

[0022]

According to the present invention, the supply conduit and the exhaust conduit of the heat transfer medium, which are the main parts that generate heat loss during heat storage in the heat storage device, are made of ceramic material, and the heat loss from these parts. Is reduced.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a schematic configuration of a heat storage device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of portion B in FIG.

FIG. 4 is a heat storage block 1 used in the heat storage device of the present invention.
It is a partial expansion perspective view of an example.

5 is a view of the heat storage block of FIG. 4 viewed from the direction of arrow 8. FIG.

FIG. 6 is a view of the heat storage block of FIG. 4 viewed from a direction of an upper portion (arrow) 11.

FIG. 7: Heat transfer medium container 1 in which two heat storage blocks are combined
4 is a perspective view showing a schematic configuration of FIG.

FIG. 8 is a partial enlarged cross-sectional view showing the structure of a discharge conduit section (supply conduit section) according to another embodiment of the present invention.

FIG. 9 is a perspective view of the heat storage device showing the mounting positions of the preferable supply conduit and discharge conduit according to the present invention.

[Explanation of symbols]

 1 Heat Storage Device 2 Heat Transfer Medium Passage 5 Heat Storage Agent Housing 6 Cavity 7 Heat Storage Agent 15, 16 Heat Transfer Medium Storage 17 Supply Pipe 18 Discharge Pipe 38 Heat Storage Block 40 Heat Storage Core 41 Heat Insulation Area 50 Outer Casing 51 Inner Casing 52 , 52a Brazing 60 Ceramic material pipe 61 Metal pipe 62 Metal bellows pipe

Claims (2)

[Claims] 1. An inner casing 51 surrounding a regenerator core 40, an outer casing 50 surrounding the inner casing 51 with a space, a heat insulating region 41 between the inner casing 51 and the outer casing 50, and a regenerator. Core 4
Supply conduit 17 and discharge conduit 1 for the heat transfer medium guided to 0
In the heat storage device 1 including the heat storage device 8, the supply pipe 17 and the discharge pipe 18 are made of a ceramic material. 2. An inner casing 51 surrounding the regenerator core 40, an outer casing 50 surrounding the inner casing 51 at a distance, a heat insulating region 41 between the inner casing 51 and the outer casing 50, and a regenerator. Core 4
Supply conduit 17 and discharge conduit 1 for the heat transfer medium guided to 0
In the heat storage device 1 including the metal pipe 61, the supply pipe 17 and the discharge pipe 18 are closely fixed to the inner peripheral surface of the mounting hole of the heat storage core exterior, and the metal bellows pipe 62 of the heat insulation region 41 and Outer casing 50 connected to the metal bellows
Ceramic material tube 6 closely attached to the inner peripheral surface of the mounting hole of
A heat storage device comprising 0 parts.