JPH1071840A - Insulation tank - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent mixing of cold water and hot water in a heat retention tank. SOLUTION: A storage part 22 is divided into two parts by a flange part 57a, and comprises a storage part 22a and a storage part 22b. A communication hole 100 is formed in the flange portion 57a. When the engine is started, the cold water flows into the storage section 22a and mixes with the warm water in the storage section 22a.
Flow into b. The warm water in the storage section 22b flows out of the heat retaining tank 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated tank, and more particularly to a method for quickly warming up an engine by supplying high-temperature engine cooling water to the engine or for supplying high-temperature engine cooling water to a vehicle heating system. The present invention relates to a heat retention tank used for heating a vehicle interior immediately by supplying the heater core to the heater core.

[0002]

2. Description of the Related Art Conventionally, as a structure of a heat retaining tank, there is a structure described in Japanese Patent Application Laid-Open No. 7-164864. A warm water inlet for taking in warm water and a warm water discharge pipe for supplying warm water taken in from the warm water inlet to a heater core of a vehicle heating device are provided at a lowermost portion of the heat retaining tank. One end on the upstream side of the hot water discharge pipe is configured to open to an upper part in the heat retaining tank, and the other end is located at a lower part of the heat retaining tank as described above.

[0003] For example, when the vehicle is parked for a long time in winter and the engine cooling water is completely cooled, and the vehicle heating device performs immediate heating, the pump built in the engine is driven to cool the vehicle. The cooled cooling water flows into the lower part of the heat retention tank from the hot water inlet, and the high temperature hot water in the heat retention tank is pushed upward by the flowed cooling water and flows into the hot water discharge pipe. It is designed to flow in.

When the high-temperature cooling water in the heat-retaining tank is pushed out by flowing the cooling water thus cooled, when the high-temperature cooling water is mixed with the low-temperature cooling water, the heater core is discharged from the hot water discharge pipe. The temperature of the hot water flowing into the furnace decreases, and sufficient immediate heating cannot be performed. Therefore, a cold / hot water mixing prevention plate is provided at a lower portion in the heat retaining tank so that the cooled cooling water flowing from the hot water inlet does not mix with the high-temperature cooling water as much as possible.

[0005]

However, as a result of investigations by the present inventors, the flow rate (flow rate) of the cooled cooling water flowing into the heat retaining tank is increased. For example, the rotation speed of a pump built in the engine is high. At times, it has been found that the hot water mixing prevention plate cannot sufficiently prevent the mixing of cold water and hot water due to forced convection.

Accordingly, an object of the present invention is to provide a heat retention tank that can further prevent mixing of cold water and hot water.

[0007]

According to the present invention, in order to solve the above-mentioned problems, according to the first to fifth aspects of the present invention, the inflow passage (24) is provided in the storage portions (22a, 22b) of the heat retaining tank. ) Between the mouth and the outflow channel (56, 57)
A partition wall (57a) is provided so as to partition the storage portions (22a, 22b) into a plurality, and the partition wall (57a) is provided.
Is characterized in that a plurality of communication holes (100) communicating between the storage portions (22a, 22b) partitioned into a plurality are formed.

Accordingly, even if the flow rate (flow rate) of the cold water flowing into the storage section from the inflow channel (24) increases, the storage section located on the inflow channel (24) side among the plurality of storage sections. The cold water and the hot water are mixed by forced convection, but the cold water does not directly flow into the reservoir located on the outflow channel side but flows through the communication hole (100) formed in the partition wall. The forced convection can be suppressed in the outlet storage section. As a result, the temperature of the hot water flowing out of the heat retaining tank can be increased.

The definition of the partition wall in the present invention is as follows.
When the cold water flows from the inflow channel into the storage section, the cooling water in the storage section only needs to pass through the communication hole formed in the partition wall, and the space between the partition wall and the inner surface of the heat retaining tank is sufficient. May be opened. In the invention according to the third aspect, a plurality of communication holes (100) are provided in each of the communication holes (100) and the storage portion (22) of the inflow channel (24).
a, the longer the flow path length with the outlet to 22b),
The feature is that the opening area is large.

Thus, the flow rate of the cold water after passing through the plurality of communication holes can be made uniform, and the cold water in the reservoir on the outflow channel side (the cold water flowing in from the inlet and the reservoir in the inlet side) can be reduced. And hot water in the reservoir on the outflow channel side can suppress forced convection.
As a result, the temperature of the hot water flowing out of the heat retaining tank can be further increased.

Further, the invention according to claim 5 is characterized in that the opening area ratio of the plurality of communication holes (100) formed in the partition wall (57a) is set to 30 to 45%. . As a result, the temperature of the hot water stored in the storage section can be kept as low as possible for a long time.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) An embodiment of the present invention shown in the drawings will be described below. A case where the heat retention tank according to the present embodiment is used as a heat retention device of a vehicle heating type heating device will be described.

Hereinafter, the schematic configuration of the warming type heating apparatus for a vehicle will be described, and then the warming tank according to the present embodiment will be described in detail. FIG. 1 shows a cooling circuit 1 (a circuit surrounded by a two-dot chain line) of a water-cooled engine and a hot water circuit 2 (a circuit surrounded by a one-dot chain line) of an insulated heating device for a vehicle. 3
Is a water-cooled engine for vehicles, and 4 is a water-cooled engine 3
This is a water pump that circulates warm water (cooling water).
Part of the hot water that has taken the heat of the water-cooled engine 3 flows into the above-described cooling circuit 1 of the water-cooled engine, and the other hot water flows into the hot water circuit 2 of the insulated heating device for the vehicle.

Reference numeral 5 denotes a radiator that serves as a cooling unit for cooling the hot water (cooling water) of the water-cooled engine 3 in the cooling circuit 1 for the water-cooled engine. Further, the cooling circuit 1 is provided with a bypass circuit 7 for bypassing the hot water circuit 6 flowing through the radiator 5.
It is controlled by a thermostat 8. Incidentally, the switching between the two hot water circuits is usually controlled so that the hot water temperature flows to the radiator 5 when the hot water temperature is 80 ° C. or higher.
If the temperature is not more than ° C., it is controlled to flow to the bypass circuit 7.

On the other hand, in the hot water circuit 2 of the insulated heating device for a vehicle, a hot water tank 9 for keeping hot water (heat storage) is provided downstream of the hot water of the water-cooled engine 3, and the hot water tank 9 is bypassed. A bypass circuit 10 is provided. A three-way valve portion 11 for switching between an inflow circuit 10a (inflow passage (24)) flowing into the heat retaining tank portion 9 and a bypass circuit 10 is provided at a branch point between the two hot water circuits. The three-way valve portion 11 has a switching function of the hot water circuit and also has a flow rate adjusting mechanism. In addition,
In the present embodiment, the heat retaining tank 9 and the three-way valve 11 are assembled integrally, and hereinafter, the assembly of the two is referred to as the heat retaining tank 40. Reference numeral 10b denotes an outflow circuit (outflow channel) through which hot water flows out of the heat retaining tank unit 9.

When the insulated heating device for a vehicle according to the present embodiment is installed in a vehicle, the insulated tank 40 is installed in the interior of the engine room. A heater core 12 serving as a heating means for the vehicle interior is provided on the downstream side of the warm water in the heat retaining tank 40, and the hot air heated by the heater core 12 is blown into the vehicle interior by a blower 13 through a duct (not shown). Is done. In addition, heater core 1
On the hot water inflow side of No. 2, a two-way valve 15 for opening and closing a hot water circuit 14 for hot water flowing into the heater core 12 is provided. The two-way valve 15 is controlled so as to close the hot water circuit 14 in order to suppress the radiant heat from the heater core 12 when the heating is not used in summer or the like.

On the upstream side of the two-way valve 15 with hot water,
A bypass circuit 16 that bypasses the hot water circuit 14 flowing through the heater core 12 is provided. And the hot water circuit 1
Downstream of the bypass circuit 4 and the bypass circuit 16 are connected to the water pump 4 to form a hot water circuit 2 of the insulated heating device for a vehicle. Next, with respect to the heat retaining tank section 9 of the heat retaining tank 40,
This will be described with reference to FIG.

In FIG. 2, reference numeral 21 denotes an inner tank made of a material having excellent corrosion resistance (in this embodiment, SUS304).
The cup-shaped tank is formed in a capsule shape by welding to each other at its opening. Then, the inner space 22 of the inner tank 21 thus formed is formed.
However, the storage unit stores hot water discharged from the water-cooled engine 3 (22 is a storage unit). Incidentally, in this embodiment, the major axis is about 335 mm, the minor axis is about 125 mm, and the capacity is
It is about 3 liters.

At the longitudinal end of the inner tank 21, one opening 23 is provided. As shown in FIG. 2, one side of a pipe 24 through which hot water flows into the reservoir 22 is formed. , Are welded to the inner tank 21. The pipe 24 is made of a material having excellent corrosion resistance (in this embodiment, SU
S304, thickness 0.5 mm. Note that hatching is omitted in FIG. ), The other end side opening,
It is welded to an opening 25 of an outer tank 26 to be described later, and the pipe 24 allows the storage 22 in the inner tank 21 to communicate with the outside of the heat retaining tank 9.

The inner diameter of the pipe 24 is
1, and the length of the pipe 24 in the longitudinal direction is larger than the inner diameter of the pipe 24. The inner diameter of the pipe 24 of this embodiment is about 20
mm and its longitudinal dimension is about 40 mm.
Further, the entire outside of the inner tank 21 is made of a material having a predetermined mechanical strength (in this embodiment, SUS304, thickness of 0.1 mm).
5 mm), which are welded together at a joint 27 on the side of the opening 25. Further, like the inner tank 21, the outer tank 26 is manufactured by welding cup-shaped tanks together at the opening thereof.

The two tanks have a predetermined gap (about 5 mm in this embodiment), and this gap is almost in a vacuum state. Therefore, the heat retention tank unit 9
This gap forms a heat insulating structure. Further, a material having a predetermined mechanical strength (in this embodiment, SUS304, thickness 0.5 m) is provided on the opening 25 side of the outer tank 26.
m. In this drawing, hatching is omitted. )
The mounting 27a is welded.

The projecting portion 9a of the heat retaining tank 9 is
The valve housing 41 of the three-way valve portion 11 is covered with a heat insulating cover portion 41a integrally formed with the valve housing 41. The valve housing 41 is made of a resin having a low thermal conductivity (for example, nylon 66, polycarbonate, or the like). An O-ring 28 (seal material) made of nitrile rubber for securing the sealing property is arranged at the fitting portion between the valve housing 41 and the heat retaining tank portion 9 at the joint portion 27 and the base of the protruding portion 9a. The heat retaining tank 9 and the three-way valve 11 are
It is assembled with a bolt (not shown) to a flange formed on the heat-insulating cover 41a via 7a.

Next, the three-way valve section 11 will be described with reference to FIG. Reference numeral 42 denotes a hot water inlet for guiding hot water into the heat retaining tank 40, and reference numeral 43 denotes a hot water outlet for flowing hot water stored in the heat retaining tank 40. And hot water outflow entrance 4
A housing cover 44 forming the inflow circuit 10a is attached to the valve housing 41 via an O-ring 41a with a bolt (not shown) at the end of the valve housing 41 without the components 2 and 43. At the opposite end of the valve housing 41, a housing cover 45 forming the bypass circuit 10 is attached to the valve housing 41 via an O-ring 41a with a bolt (not shown).

At the substantially center of the valve housing 41, there is formed a hollow cylindrical communication chamber 46 that forms the inflow circuit 10a, the bypass circuit 10, and the hot water branch. On the inflow circuit 10a side in the center of the communication chamber 46, there is formed a valve seat 47 extending over the entire inner periphery of the communication chamber 46, and the valve port 4 formed by the valve seat 47 is formed.
An orifice valve 48 (valve element) made of resin is provided on the inflow circuit 10a side of 7a to adjust the flow rate of hot water flowing through the inflow circuit 10a.
Is arranged. An annular sealing material (for example, nitrile rubber) 4 is provided on the contact surface between the orifice valve 48 and the valve seat 47.
8a is adhered to the orifice valve 48.

Then, at the center of the orifice valve 48,
An orifice 48b penetrating the orifice valve 48 and communicating with the inflow circuit 10a is provided in parallel with the communication chamber 46, and has a hole diameter of about 4 mm in this embodiment. ) Is larger than the orifice hole diameter (about 2 mm in this embodiment) on the valve seat 47 side.

A guide post 49 for guiding the sliding of the orifice valve 48 is provided at the intersection of the extension of the center line of the orifice 48b and the housing cover 44. , As shown in FIG.
A groove 49c is provided. This groove depth is equal to orifice 4
8b with the guide post 49 inserted, the orifice 48
The depth is such that the flow rate of the hot water flowing through “a” satisfies the predetermined flow rate.

The inflow circuit 10a of the orifice valve 48
A groove 48c is provided in the outer edge on the side to improve the seating of the return spring 50 of the orifice valve 48. For the same reason, the portion 44a of the housing cover 44 where the end of the spring 50 is located is formed concavely. In the communication chamber 46 on the side of the bypass circuit 10, a thermostat 51 (temperature-sensitive valve element) serving as a temperature-sensitive valve element of the bypass circuit is arranged. 52 is a thermostat 51
The metal casing has an opening at the side and both ends. Among these openings, a resin convex portion 52b is provided at the center of the opening 52a on the bypass circuit 10 side, and the convex portion 52b is hollow with its convex tip closed. It has become. The bypass circuit 10 in the communication chamber 46 is formed by the opening 52a and the opening on the side surface of the casing 52, and the opening and closing of the bypass circuit 10 is controlled by opening and closing the opening 52a. .

On the central axis of the casing 52, a wax box 53 serving as a temperature-sensitive operating member is disposed so as to be slidable in the axial direction of the communication chamber 46. Is provided with a flange portion 53a. The flange 53a is pressed against the opening 52a via a return spring 54, and the opening 52a is opened and closed by the wax box 5.
3 is controlled by sliding.

The wax box 53 is filled with a wax having a predetermined melting point (about 40 ° C. in this embodiment), and a shaft 55 that moves according to a change in the volume of the wax is slidable. It is stored in a wax box 53. One end of the shaft 55 is inserted inside the above-mentioned convex portion 52b, and the wax box 532 is expanded by the volume expansion of the wax.
Move to a side.

On the inflow circuit 10a side of the casing 52,
A folded portion 52b is formed on the inside thereof, and the above-described spring 54 is disposed between the flange portion 53a and the folded portion 52c. By the way, the inflow circuit 10a communicates with the opening 25, and as shown in FIG. 2, an outflow pipe 56 for leading out hot water stored in the heat retaining tank 40 is formed integrally with the valve housing 41. The outflow pipe 56 is disposed substantially concentrically with the pipe 24, and a gap between the pipe 24 and the outflow pipe 56 forms a part of the inflow circuit 10 a communicating with the heat retaining tank 40. In addition, the bypass circuit 10 and the outflow pipe 56 communicate with each other at the side of the outflow pipe 56 to form the bypass circuit 10. The outflow pipe 56
Is a part of the outflow circuit 10b.

Then, as shown in FIG.
6, an inner pipe 57 made of a resin (Teflon in this embodiment) having a low thermal conductivity for flowing out of the upper-side hot water stored in the heat retaining tank 40 is provided at the inner end of the heat retaining tank 40. It is pressed into the outflow pipe 56. A flange portion 57a is integrally formed at the end of the press-fit portion of the inner pipe 57, and the flange surface of the flange portion 57a is horizontal when the heat retaining tank 40 is mounted on the vehicle. . The flange portion 57a has a shape along the inner peripheral shape of the inner tank 21 as shown in FIG.
The inner pipe 57 is formed in a disk shape, and the outflow pipe 5
6, the outer peripheral end of the flange portion 57 a comes into contact with the inner surface of the inner tank 21.

As a result, the flange portion 57a serves as a partition wall for dividing the storage portion 22 into two in the vertical direction as shown in FIG. And this flange portion 57
By a, the storage section 22 is partitioned into a lower storage section 22a located on the pipe 24 side and an upper storage section 22b located on the inflow port 58 side of the inner pipe 57. That is, the flange portion 57 a partitions the storage portion 22 into two portions between the pipe 24 and the inflow port 58 of the inner pipe 57 in the storage portion 22. As shown in FIG. 2, a plurality of communication holes 100 are formed in the flange portion 57a to communicate the storage portion 22a and the storage portion 22b.

FIG. 4 is a top view of the flange portion 57a viewed from above in FIG. The flange portion 57a
It has a circular shape as shown in the figure, and has an outer diameter of 110 mm in this embodiment. The communication holes 100 are formed in a circular cross section, and are arranged linearly along the radial direction of the flange portion 57a from the inner pipe 57 located at the center of the flange portion 57a as shown in the figure. Is formed. When the communication holes 100 are, for example, communication holes 100 arranged in one direction in the radial direction of the flange portion 57a, the communication holes 100 of the communication hole group 100a have an inner diameter of the flange portion 57a. The opening area increases from the side toward the outer diameter side.

In this embodiment, the communication hole group 100a
Is composed of seven communication holes 100, the inner diameter is 2 mm, the fifth is 2.5 mm, and the remaining two are 3 mm in order from the inner diameter side to the outer diameter side of the flange portion 57a. . In the present embodiment, such a communication hole group 100a is formed along the entire circumference of the flange portion 57a in the circumferential direction. Thus, the communication hole 100 is formed radially around the outflow pipe 57 in the flange portion 57a.

Also, as shown in FIG.
The communication hole 100 is not formed in the innermost portion of the storage portion 22a, and serves as a reduction portion 57b that reduces the flow rate of the hot water flowing into the storage portion 22a from the inflow port 24a of the inflow pipe 24. In other words, as shown in FIG. 2, when the inner pipe 57 is pressed into the outflow pipe 56, the speed reduction portion 57 b is located just above the inflow port 24 a of the inflow pipe 24. In this state, the flow path length between the plurality of communication holes 100 having different opening areas and the inflow port 24a is naturally different, and becomes longer from the inner diameter side to the outer diameter side of the flange portion 57a. In the present embodiment, the communication holes 10
0 and the flow path length between the inflow port 24a and the communication hole 1
00 has an enlarged opening area.

FIG. 5 is an enlarged view of a portion B of the heat retaining tank 40. A rectangular hot water inflow / outflow 58 is provided on the pipe peripheral surface of the inner pipe 57 on the side of the inner pipe 57 opposite the flange portion 57a. A stainless steel support pin 60 serving as a support member for the inner pipe 57 is provided in an opening 59 at the end of the pipe.
It is welded to the inner tank 21. And the support pin 6
A stainless steel quake-resistant pin 61 is welded to the outer tank 26 corresponding to the portion where 0 is welded. The surface of the pin portion of the quake-resistant pin 61 is made of ceramics in order to reduce the amount of heat transfer. Coated.

An L-shaped stainless steel anti-seismic spacer 62 for supporting the inner tank 21 is welded to the outside of the inner tank 21. The contact portion between the anti-seismic spacer 62 and the anti-seismic pin 61 is formed in a hemispherical shape. Once formed, they are in point contact. Next, the thermostat 5 of the three-way valve 11
After describing the operation of No. 1, the operation of the hot water circuit 2 and the warming tank 40 of the vehicle warming type heating device shown in FIG. 1 will be described.

When the temperature of the hot water in the communication chamber 46 becomes high (40 ° C. or more in the present embodiment), the wax in the wax box 53 expands, and accordingly, the wax box 53 moves to the orifice valve 48 side. Since the opening is started, the opening 52a is opened, and the bypass circuit 10 starts to communicate.
Then, when the wax box 53 is further moved, the wax box 53 starts to contact the central portion of the orifice valve 48, so that the orifice 48b is closed. Hereinafter, the hot water circuit flowing through the orifice 48b and into the heat retaining tank 40 is referred to as the orifice circuit 10b. Further, when the orifice valve 48 moves to the wax box 53, the orifice valve 48 starts to move. Therefore, the valve port 47a starts to open, and the inflow circuit 10a starts to communicate. The orifice circuit 10
b, as is apparent from FIG.
Until the orifice 48b is closed.
9c.

Next, the operation of the insulated heating system for a vehicle will be described with reference to FIG. 1. Immediate heating mode The hot water temperature immediately after the engine starts is low (in this embodiment, 4
When the temperature is lower than 0 ° C.), since the low-temperature water flows in, the thermostat 51 does not operate as described above, so that the bypass circuit 10 is kept closed. For this reason, the low-temperature water passes through the orifice circuit 10b,
0, and the same amount of high-temperature water (about 1 liter / min in this embodiment) as the low-temperature water flowing into the heat-retaining tank 40 and stored in the heat-retaining tank flows into the heater core 12. Perform immediate heating.

2. Hot water bypass mode Then, the temperature of the hot water rises (40 ° C. or more in this embodiment).
Then, since the thermostat 51 starts to operate, the bypass circuit 10 starts to open. And the orifice circuit 10
b is closed, the supply of hot water from the heat retention tank 40 to the heater core 12 is stopped, and the hot water whose temperature has risen from the water-cooled engine 3 flows directly into the heater core 12 through the bypass circuit 10.

3. Heat storage mode When the hot water temperature further rises, the orifice valve 4
8 moves and the inflow circuit 10a opens. Thereby, the hot water flows into both the bypass circuit 10 and the inflow circuit 10a, and supplies the hot water to both the inside of the heat retaining tank 40 and the heater core 12. Incidentally, the amount of hot water supplied at this time is about 6 liter / min in this embodiment.

Next, the features of this embodiment will be described. The joint 2 between the outer tank opening 25 and the pipe 24 occupying the largest proportion of the total heat release from the heat retaining tank 40 to the atmosphere.
7 and the outer tank opening 25 are covered with a heat insulating cover portion 41a made of resin having a low thermal conductivity, so that the joint portion 27 and the opening 25 are directly exposed to the atmosphere as compared with a heat retaining tank. In addition, the amount of heat radiation to the atmosphere can be reduced. Therefore, the heat retention capacity can be improved. Further, since the heat insulating cover portion 41a is integrally formed with the valve housing 41, the number of components is reduced, so that the manufacturing cost of the heat retaining tank 40 can be reduced.

Since the opening and closing of the bypass passage 10 and the inflow circuit 10a can be controlled by one wax box 53, the number of parts constituting the valve mechanism can be reduced, and the valve mechanism can be formed at low cost. . Also,
Since the orifice 48b is provided in the orifice 48, the orifice valve 48 is directly moved to
The aperture ratio can be finely adjusted more easily than the one in which the aperture ratio of a is finely adjusted. Therefore, the valve mechanism can be configured at lower cost.

The greatest feature of this embodiment lies in the flange portion 57a of the inner pipe 57. That is,
In the immediate heating mode, when the engine 3 starts, the water pump 3 is driven, and the low-temperature water having a low hot water temperature (in this embodiment, less than 40 ° C.)
It flows into 4. When the flow rate of the low-temperature water (also referred to as the flow rate) is high, for example, when the rotation speed of the engine 3 is high and the rotation speed of the pump 4 is high, the forced convection in the storage section 22 causes the convection convection from the outflow pipe 56 as described above. The temperature of the hot water flowing out of the heat retaining tank 9 will decrease.

The reason for this is that when the rotation speed of the pump 4 becomes high, a large amount of low-temperature water flows into the inflow pipe 24 and the temperature of the hot water flowing out of the heat-retaining tank 9 decreases. The portion 57a also functions to increase water flow resistance so that low-temperature water does not flow into the heat retaining tank 9. Then, the low-temperature water flows from the inflow port 24a of the inflow pipe 24 into the storage section 22b. The low-temperature water flows so as to hit the deceleration section 57b located above the inflow port 24a. The flow rate decreases.

The low-temperature water flows into the communication hole 100 while being mixed with the high-temperature water in the storage section 22a. Here, the low-temperature water (actually, a mixture of low-temperature water and high-temperature water, hereinafter referred to as mixed water) is supplied to communication holes 100 having different opening areas.
Is used to adjust the flow velocity. Specifically, in the present embodiment, as shown in FIG. 2, the flow path length between the inflow port 24 a of the pipe 24, which is the hot water inlet opening to the storage section 22, and each communication hole 100 is different. By increasing the opening area of the communication hole 100 as the flow path length increases, the communication hole 1
When the water flows into the storage portion 22a after passing through 00, the flow rate of the cold and hot water flowing into the storage portion 22a from all the communication holes 100 is made substantially uniform.

For example, assuming that the opening areas of the communication holes 100 are all the same, the flow velocity of the mixed water flowing into the storage portion 22b from the communication hole 100 located on the inner diameter side of the flange portion 57a is It is higher than that of the communication hole 100 located. As a result, the forced convection easily occurs in the storage section 22b due to the high-speed cold and hot water, and the temperature of the hot water in the storage section 22b decreases in a short time. There is a problem that can not be obtained.

Therefore, in the present embodiment, as described above, by making the flow velocity of the cold water flowing from all the communication holes 100 into the storage portion 22b uniform, forced convection in the storage portion 22b is prevented as much as possible. It is. And FIG.
Fig. 2 shows experimental data studied by the present inventors. The non-mixing ratio indicates the degree of mixing of the cold water and the hot water in the storage unit 22 when the cooled cold water flows into the storage unit 22 in the immediate effect heating mode. Percent means that cold and hot water are not mixed at all. Also, the non-mixing ratio, which is the vertical axis, is
It can also be considered as the temperature of hot water supplied to the heater core from the heat retaining tank 40 in the immediate effect heating mode.

The experimental conditions were as follows: the temperature of the hot water in the storage section 22 was 80 ° C., the temperature of the cold water flowing into the storage section 22 was 20 ° C.
The flow rate into the storage section 22 is about 1 liter / min.
And strictly speaking, the non-mixing ratio in the present embodiment is:
The temperature of the hot water flowing out of the storage unit 22 hardly decreases, and can be effectively used for immediate heating 75. It can be said that the effective heating capacity is how long the warm water of C or more can be continuously flowed.

As can be seen from FIG. 6, the non-mixing ratio in the conventional apparatus is not so different from that in the present embodiment at about 1 liter / min where the flow rate (also referred to as flow velocity) into the heat retaining tank 40 is small. However, as the inflow rate increases,
Although the non-mixing rate is reduced in the conventional one, the high non-mixing rate can be maintained in the embodiment according to the present invention, though slightly reduced.

The experimental conditions were as follows: the temperature of the hot water in the storage section 22 was 88 ° C., the temperature of the cold water flowing into the storage section 22 was 25 ° C., and the flow rate of the inflow was about 6 l / min. Therefore, the temperature of the hot water flowing out of the storage section 22 was 65 ° C., whereas the temperature of the hot water flowing out of the storage section 22 was 84 ° C. in the present embodiment. According to the study by the present inventors, it has been found that the non-mixing ratio is greatly affected by the opening area ratio of the plurality of communication holes 100 formed in the flange portion 57a. This experimental data is shown in FIG.
Shown in The experimental conditions were as follows: hot water temperature 8 in storage section 22;
The temperature of the cold water flowing into the storage unit 22 is 0 ° C., the flow rate of the cold water flowing into the storage unit 22 is about 1 liter / min.

As can be seen from the graph, when the inflow rate into the storage section 22 is small, the non-mixing ratio can be set to a high value of 90% or more by setting the opening area ratio between 30% and 45%. It turns out to be good. Thereby, the hot water can be sent to the heater core 12 for a long time without lowering the temperature of the hot water in the storage section 22 as much as possible,
The immediate heating mode can be set for a long time while giving the occupant a feeling of heating.

Further, in this embodiment, it is assumed that, in addition to the immediate heating mode for the high-temperature water stored in the heat retaining tank 40, an immediate warm-up mode for immediately warming up the engine is added. Specifically, a quick-acting warm-up switch (not shown) is provided in the vehicle compartment, and when this quick-acting warm-up switch is turned on, the two-way valve 15 closes the flow path to the heater core 12. Then, the high-temperature water stored in the storage unit 22 is:
The gas flows into the engine 3 through the bypass circuit 16 bypassing the heater core 12. In this case, the engine 3
Is not so high, so that the hot water does not flow to the radiator 5 by the thermostat 8.

Therefore, even when the engine 3 is immediately warmed up by the heat retaining tank 40 of the present embodiment, the engine is sufficiently warmed up without lowering the temperature of the hot water flowing out of the storage section 22 as described above. can do. FIG. 8 shows experimental data obtained when the inventors used the heat retaining tank 40 in the present embodiment in the immediate warm-up mode. The experimental conditions were as follows: the temperature of the hot water in the storage section 22 was 88 ° C. in a state where the vehicle was left in the 0 ° C. atmosphere for a long time (for example, 24 hours). The initial cold water temperature flowing into the storage unit 22 was also 0 ° C., and the flow rate into the storage unit 22 was about 6 liter / min.

Under these conditions, the temperature of the hot water flowing out of the storage section 22 of the heat retaining tank 40 of the present embodiment is 84 ° C., and 65 ° C. in the conventional case. It has excellent effects of 2.5% fuel consumption and 24% emission reduction. Note that the emission refers to harmful substances (such as nitrogen oxides) contained in the exhaust gas discharged from the engine.

That is, in the present embodiment, since the cold water flowing into the storage portion 22a does not directly flow into the storage portion 22b but flows through the communication hole 100 of the flange portion 57a, forced convection flows in the storage portion 22b. Since it is unlikely to occur, the hot water in the storage section 22b can be allowed to flow into the outflow pipe 56 without substantially lowering the temperature. Therefore, in the immediate heating mode, the heating capacity can be sufficiently maintained for a long time.

In the present embodiment, the diffusion of heat in the storage section 22 can be suppressed by such a flange portion 57a, and the heat retention of the heat retention tank 40 can be improved. In the present embodiment, the hot water flows into and out of the inner tank 21 through the pipe 24 and the outflow pipe 56 arranged concentrically with the pipe 24.
Independent openings for inflow etc.
The amount of heat released to the atmosphere can be reduced as compared with the case where the heat sink is provided.

Also, since the valve housing 41 is disposed so as to cover the entire outside of the projection 9a, the O-ring 28
Can be arranged outside the outer tank 26 of the protruding portion 9a. Therefore, compared with the case where the O-ring 28 is arranged inside the pipe 24, it is possible to ensure a large effective cross section through which hot water flows without increasing the inner diameter of the pipe 24. Therefore, the outflow / inflow resistance of the hot water can be reduced, so that the time for filling the warming tank 40 with the hot water can be shortened.

(Second Embodiment) In the first embodiment,
The three-way valve portion 11 was formed integrally with the heat retaining tank portion 9, and this three-way valve portion 11 had a function of switching the hot water circuit and also functioning as a flow rate adjusting mechanism. However, the present invention can be applied even without such a three-way valve portion 11. FIG. 9 shows the heat retaining tank section 9 in the present embodiment. Note that FIG.
, Those that perform the same functions as in the first embodiment are denoted by the same reference numerals.

In this embodiment, there is no bypass circuit 10 because there is no three-way valve portion 11 in the first embodiment. Therefore, the inflow / outflow ports that lead to the warming tank section 9 in the present embodiment are only the warm water inlet 42 that guides warm water into the warming tank 40 and the warm water outlet 43 that flows out warm water stored in the warming tank 40. . Then, when this heat retention tank 9 is applied to FIG. 1, if the water pump 4 is driven irrespective of the temperature of the hot water flowing into the heat retention tank 9, warm water always flows from the warm water inlet 42 to the storage part 22, The hot water in the storage section 22 flows out of the hot water outlet 43 and flows to the heater core 12. The heat retention tank 9 of the present invention can be applied to such a case.

(Other Example) In the above embodiment, the pipe 24
And the outflow pipe 56 are concentrically arranged to form a double pipe structure. However, the pipe 24 and the outflow pipe 56 may be formed separately. Further, in the above-described embodiment, the hot water is caused to flow in and out from below the storage section 22. However, the flow of the hot water and the flow of the hot water may be performed from anywhere in the storage section 22.

In the above embodiment, the flange 57
Although a is formed integrally with the inner pipe 57, for example, a flange portion 57a may be formed separately, and may be joined to the inner surface of the inner tank 22 by welding or the like. Further, in the above-described embodiment, the flange portion 57a is in contact with the inner surface of the inner tank 21, but a gap may be opened between the inner surface and the flange portion 57a. That is, in the present invention, the flange portion 57a having the communication hole 100 that is sufficiently larger than the opening area of the outlet 24a of the pipe 24 is provided.
What is necessary is just to be able to pass through the communication hole 100 and flow into the storage section 22b when the hot water flows into the storage section 22b from a.

The flange 57a may be a punched metal having a constant opening area of a hole (communication hole), such as a punched metal. Further, in the above embodiment, a plurality of flange portions 57a may be provided to partition the storage portion 22 into three or more. Furthermore, the heat retention tank according to the present invention can be used not only as a heat retention tank for a hot water heating device, but also as a heat source for warming up the engine immediately after starting the engine, such as engine oil, transmission oil, or automatic transmission oil.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cooling circuit 1 and a hot water circuit 2 according to a first embodiment of the present invention.

FIG. 2 is a detailed view of a heat retaining tank 9 in the first embodiment.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a detailed view of a flange portion 57a in the embodiment.

FIG. 5 is a detailed view of a heat retaining tank 9 in the first embodiment.

FIG. 6 is a diagram illustrating a relationship between an inflow flow rate and a non-mixing ratio in the first embodiment.

FIG. 7 is a diagram showing a relationship between an aperture ratio and a non-mixing ratio in the first embodiment.

FIG. 8 is a diagram showing a relationship between hot water temperature, fuel efficiency improvement and emission reduction in the first embodiment.

FIG. 9 is a view showing a heat retaining tank 9 according to a second embodiment of the present invention.

[Explanation of symbols]

9: thermal insulation tank, 22a, 22b: storage section, 24: pipe, 56: outflow pipe, 57: inner pipe, 57a: flange section, 100: communication hole

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Sugi Hikari 1-1-1, Showa-cho, Kariya, Aichi Prefecture Nippon Denso Co., Ltd.

Claims (5)

[Claims] An insulated heat retaining tank (9) having a storage portion (22a, 22b) for storing engine cooling water therein, wherein the heat retention tank (9) includes the storage portion (22a, 22b). An inflow passage (24) through which the engine cooling water flows, and an inflow passage of the engine cooling water from the inflow passage (24) into the reservoirs (22a, 22b). , 22b) having an outflow channel (56, 57) through which the engine cooling water flows out of the heat retention tank, and having the inflow channel (2) in the storage section (22a, 22b).
A partition wall (57a) is provided between the outflow channel (56) and the outflow channel (56) so as to partition the storage section (22a, 22b) into a plurality of sections. A plurality of communication holes (10) communicating between the storage portions (22a, 22b) partitioned into a plurality of portions.
0) is formed. 2. A heat insulating tank having a heat insulating structure having storage portions (22a, 22b) for storing engine cooling water therein, wherein the storage tank is provided below the storage portions (22a, 22b) in the direction of gravity. An inflow channel (24) through which the engine cooling water flows into the storage portions (22a, 22b); and an inflow channel (2) in the storage portion (22a, 22b).
4) is provided above in the direction of gravity, and
From 4), the engine cooling water is stored in the storage portions (22a, 2a,
2b), the storage portions (22a, 22a)
b) outflow channels (56, 57) through which the engine cooling water in the b) flows out of the heat retention tank, and the storage portion (22) in the storage portions (22a, 22b).
a, 22b) between the inlet of the inflow channel (24) and the outflow channel (56, 57).
a, 22b) is provided with a plurality of communication holes (10) communicating between the storage sections (22a, 22b) partitioned into a plurality of partitions (57a).
0) is formed. 3. The plurality of communication holes (100) are provided in each of the communication holes (100) and the storage portion (2) of the inflow channel (24).
3. The heat retention tank according to claim 1, wherein the opening area increases as the flow path length with the outlet (24 a) to the outlets (2 a, 22 b) increases. 4. 4. The outflow channel (56, 57) is constituted by a pipe-shaped hot water discharge pipe provided in the storage section (22a, 22b). The hot water discharge pipe is provided at an outer peripheral portion of the hot water discharge pipe, and the inflow channel (24) and the outflow channel (56) have a double pipe structure. Insulation tank according to any one of the above. 5. An opening area ratio of the plurality of communication holes (100) formed in the partition wall (57a) is 30-4.
The heat retention tank according to any one of claims 1 to 4, wherein the temperature is set to 5%.