JPH07237435A - Hot water circulation type heating device - Google Patents

Abstract

PURPOSE:To provide a hot water circulation type heating device which can lessen unevenness in the temperature of a radiator, even when the flow rate of the hot water supplied to the radiator is little, by means of a simple device of a low cost. CONSTITUTION:A water supply pipeline 4 for supplying hot water to a radiator 3 and a return pipeline 5 for sending cooled warm water from the radiator 3 are formed into such a double tube structure that one pipe is inserted into the other pipe so that heat can be exchanged between both the warm water passing through the pipelines 4 and 5, and the warm water inlet port 77 and outlet port 78 of the radiator 3 are also formed into a double cylindrical structure corresponding to the water supply pipeline 4 and return pipeline 5, and the water supply pipeline 4 and return pipeline 5 of a double tube structure are connected to the warm water inlet port 77 and outlet port 78 of the double cylindrical structured radiator 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water circulation type heating device, such as a heating device for automobiles, in which a radiator is connected in the middle of a conduit for circulating hot water.

[0002]

2. Description of the Related Art In recent years, a so-called air mix system is used in a heating system for an automobile, in which the heating capacity is controlled by controlling the flow rate of air flowing through the radiator without controlling the flow rate of hot water flowing through the radiator. It is the mainstream.

However, in this method, the flow of air flowing through the radiator and the flow of air bypassing the radiator are controlled by a large mix door, so that it is necessary to secure a space necessary for the mix door to rotate. The disadvantage is that the device takes up a large space.

On the other hand, if the method of controlling the heating capacity by controlling the flow rate of hot water passing through the radiator is adopted, the apparatus can be made much smaller than the air mix method.

In such a hot water circulation type heating device,
When the flow rate of hot water is reduced to reduce the heating capacity, only the hot water inlet part of the radiator has a high temperature, and when it goes a little inside, the water temperature drops sharply.

[0006] Such temperature unevenness becomes extreme as the heat exchanging performance of the radiator becomes better. However, in a heating system for an automobile or the like, air is blown out into a vehicle compartment from a plurality of outlets at the same time. If there is uneven temperature on the surface of the radiator, there will be a difference in the temperature of the air discharged from each outlet.

Therefore, conventionally, for example, Japanese Patent Laid-Open No. 5-2212 is used.
As shown in No. 34, a forced circulation pipe line was provided in which a part of the water discharged from the hot water outlet of the radiator was directly returned to the hot water inlet of the radiator and fed again into the radiator.

By forcibly circulating a part of the water in such a manner, even when the flow rate of the hot water sent from the engine side to the radiator is small, a certain amount or more of hot water flows in the radiator, and It is possible to suppress the occurrence of uneven temperature.

[0009]

However, in order to provide such a forced circulation line, a pump for forced circulation is indispensable, and a check valve or the like is also attached. Therefore, the manufacturing cost such as the component cost and the assembly cost is considerably increased, and there is a problem that it is difficult to put it into practical use in terms of cost.

Therefore, an object of the present invention is to provide a hot water circulation type heating device capable of reducing the temperature unevenness of the radiator even when the flow rate of the hot water sent to the radiator is small, by means of a simple and inexpensive device. And

[0011]

In order to achieve the above object, the hot water circulation type heating device of the present invention has a radiator connected in the middle of a pipe for circulating the hot water, and the hot water passing through the radiator is connected. In a hot water circulation heating device configured to control heating capacity by changing the flow rate, a water supply pipe line for sending hot hot water to the radiator and a return pipe line for sending cold hot water from the radiator. , One of which is formed in a double pipe structure surrounding the other so that heat is exchanged between the hot water passing through both pipes, and the hot water inlet and the hot water outlet of the radiator are double pipe structure. In the double cylinder structure corresponding to the above water supply pipe and return pipe, the water supply pipe and the return pipe having the double pipe structure are connected to the hot water inlet and the hot water outlet of the radiator having the double cylinder structure. A hot water circulation type heating device characterized by the above.

Further, a flow rate adjusting valve for adjusting the flow rate of the hot water passing through the radiator is provided in the middle of the pipeline upstream of the radiator, and the flow rate adjusting valve is hot to the radiator. The hot water outlet for sending out the hot water and the hot water inlet for receiving the cooled hot water sent from the radiator are formed in a double tube structure, and the water supply pipe line of the double pipe structure and the return pipe are formed therein. The pipeline may be connected.

[0013]

[Operation] The water supply pipe and the return pipe formed in the double pipe structure are
By connecting to the hot water inlet / outlet on the radiator side formed in the double cylinder structure, heat is exchanged between the hot hot water in the water supply pipe and the cold hot water in the return pipe.

As a result, the hot water in the water supply pipe is cooled and the temperature at the time of entering the radiator is lowered. On the other hand, the minimum temperature of the radiator is almost the same as the ambient temperature, and it hardly fluctuates. Therefore, the temperature unevenness of the radiator becomes smaller as the inlet temperature decreases.

[0015]

Embodiments will be described with reference to the drawings. In FIG. 1, reference numeral 1 is an automobile engine, 2 is a radiator, and 3 is a radiator in the passenger compartment.

Hot water, which is engine cooling water, is sent from the engine 1 to the radiator 2 and the radiator 3 through a water supply conduit 4 and returned to the engine 1 through a return conduit 5. 6
Is a circulation pump for circulating the engine cooling water in this way, and is driven by the engine 1.

With this structure, warm water warmed by cooling the engine 1 (generally, about 8 degrees Celsius) is used.
2 degrees) to the radiator 3 and a fan (not shown) for passing air through the radiator 3 is rotated to radiate heat to the passenger compartment for heating. The temperature of the hot water is lowered by passing through the radiator 3.

A flow rate adjusting valve 20 for adjusting the flow rate of hot water flowing from the engine 1 to the radiator 3 is inserted in the middle of the water supply pipe 4 extending from the engine 1 to the radiator 3. By adjusting the flow rate here, the heat radiation amount (heating capacity) of the radiator 3 is controlled.

The flow rate adjusting valve 20 is a solenoid drive valve which is opened and closed by the electromagnetic force of the solenoid 30 to adjust the opening. Reference numeral 31 is the electromagnetic coil. A cross-sectional shape is provided between the upstream side water supply conduit 4a for allowing hot water to flow into the flow rate adjusting valve 20 from the engine 1 and the downstream side water supplying conduit 4b for causing hot water to flow out from the flow rate adjusting valve 20 toward the radiator 3. A circular first valve seat 21 is formed.

The upstream side water supply conduit 4a and the return conduit 5 communicate with each other via a second valve seat 22 having the same shape and size as the first valve seat 21. The flow rate adjusting valve 20 includes a tapered first valve portion 201 that faces the first valve seat 21 from the downstream side, and a second valve seat that is formed symmetrically with the first valve portion 201 from the return pipe line 5 side. The second valve portion 202 facing 22 is integrally formed with a connecting rod 203 thinner than the second valve portion 202.

With such a configuration, the first valve portion 201
The differential pressure (P1-P2) between the water pressure (P1) in the upstream side water supply conduit 4a and the water pressure (P2) in the downstream side water supply conduit 4b acts on the second valve portion 202, The differential pressure (P1-P3) between the water pressure (P1) in the upstream water supply conduit 4a and the water pressure (P3) in the return conduit 5 acts in the opposite direction to the first valve portion 201.

Further, as described above, the first and second valve seats 2
Since the first and second valve portions 201 and 22 have the same size,
The effective pressure receiving areas of 02 are equal. Therefore, the water pressure (P1) in the upstream water supply conduit 4a is canceled by the first valve portion 201 and the second valve portion 202, and the flow control valve 20 has the water pressure (P1) in the downstream water supply conduit 4b ( Only the pressure difference (P2-P3) between P2) and the water pressure (P3) in the return line 5 acts.

However, the differential pressure (P2-P3) is extremely small, for example, about several tens of grams in a hot water circulation type heating device for automobiles, and can be almost ignored. Water pressure has almost no effect on the opening.

As a result, the first valve portion 201 opens and closes in accordance with the current value supplied to the electromagnetic coil 31 of the solenoid 30 (in this embodiment, the valve closing degree is proportional to the current value), and the current value It is possible to obtain a portion in which the flow rate and the flow rate are regularly correlated in a considerably wide range (for example, a flow rate range of 1:10).

The solenoid 30 is arranged so as to face the back surface of the second valve portion 202 of the flow rate adjusting valve 20 with the return pipe 5 interposed therebetween, and the solenoid 30 and the second movable iron core 34 of the solenoid 30 are provided.
A thin rod 35 is provided across the return line 5 between the valve section 202 and the back surface of the valve section 202.

A weak compression coil spring 24 for urging the flow rate adjusting valve 20 in the closing direction is provided on the downstream water supply line 4b side.
Is provided on the solenoid 30 side, and a strong compression coil spring 36 that urges the movable iron core 34 in the opposite direction is provided on the solenoid 30 side.

Therefore, when the electromagnetic coil 31 of the solenoid 30 is not energized, both compression coil springs 2
The first valve portion 201 of the flow rate adjusting valve 20 is fully opened and the second valve portion 202 is fully opened due to the difference in the biasing forces of 4, 36.

When the electromagnetic coil 31 of the solenoid 30 is energized, the movable iron core 34 is attracted to the electromagnetic coil 31 side and attracted, and the flow rate adjusting valve 20 moves in the closing direction.

In this way, the openings of the first and second valve portions 201, 202 of the flow rate adjusting valve 20 are adjusted, and the radiator 3
The flow rate of the hot water sent to is controlled, but at that time, the water pressure of the hot water has almost no effect on the opening adjustment as described above.

Therefore, the opening degree of the flow rate adjusting valve 20 depends on the biasing force of the two compression coil springs 24 and 36 and the solenoid 3
Solenoid 3 is determined by the balance with the suction force of 0.
Depending on the value of the current flowing to the electromagnetic coil 31 of 0, the radiator 3
It is possible to control the flow rate of hot water sent to the. At that time, since the effective pressure receiving areas of both valve portions 201 and 202 are equal, the hot water pressure does not influence the opening adjustment of the flow rate adjusting valve 20.

Further, the amount of warm water flowing from the upstream side water supply conduit 4a to the downstream side water supply conduit 4b through the first valve portion 201 and the upstream water supply conduit 4a through the second valve portion 202. It is almost inversely proportional to the amount of water flowing through the return pipe 5, and the sum of its flow rates hardly changes.

Therefore, the first valve portion 201 is in the closing direction, and the differential pressure (P1-P3) between the water pressure (P1) in the upstream water supply conduit 4a and the water pressure (P3) in the return conduit 5 is established. Is about to increase, the second valve portion 202 opens and the flow rate of hot water from the upstream water supply conduit 4a to the return conduit 5 increases.
The water pressure (P1) in the upstream water supply conduit 4a decreases, and the differential pressure (P1-P3) does not increase. Thereby, the pumping capacity of the circulation pump 6 can be secured.

In the range where the opening degree of the first valve portion 201 is not extremely small, the electromagnetic coil 31 of the solenoid 30 is
It is possible to control the flow rate proportionally by changing the current value supplied to the.

In a range where the opening of the first valve portion 201 is small, it is preferable to control the flow rate by supplying a pulse current to the electromagnetic coil 31 and changing the pulse width thereof. By doing so, accurate flow rate control can be performed over a wide range.

Between the flow control valve 20 and the radiator 3, the water supply conduit 4 and the return conduit 5 are formed in a double pipe structure in which the return conduit 5 surrounds the water supply conduit 4. , Both pipelines 4, 5
Heat is exchanged between the hot water inside.

FIG. 7 shows the water temperature in the water supply conduit 4, the return conduit 5 and the radiator 3 with the horizontal axis representing the position. As shown in FIG. 7, heat exchange between the hot water in the water supply conduit 4 and the hot water in the return conduit 5 cools the hot water in the water supply conduit 4 and causes the radiator 3 to cool. The temperature when entering is greatly reduced. On the other hand, the minimum temperature of the radiator 3 is almost the same as the ambient temperature and hardly changes.

As a result, if there is no heat exchange, a large temperature unevenness occurs in the radiator 3 as indicated by A, but a small temperature unevenness occurs as indicated by B by performing heat exchange. The broken line shows the case where there is no heat exchange.

Returning to FIG. 1, the water supply pipe 51 forming the water supply pipe 4 in the double pipe portion is formed of a metal pipe having a high thermal conductivity such as copper, aluminum or brass.

On the other hand, the return pipe 52 forming the return pipe line 5
Is made of a tube made of nylon, polyurethane or other flexible synthetic resin. Both tubes 51,5
2 can be formed by bending according to the pipe passage.

In this case, the return pipe 52 may be formed in a simple tube shape, but, for example, as shown in FIG. 2, a constant space is secured between the return pipe 52 and the inner water supply pipe 51. A plurality of ribs 53 may be provided so as to project radially inward.

The water supply pipe 51 and the return pipe 52 may be made of materials other than the above-mentioned materials.
When it is formed of the same synthetic resin material as nylon, for example, both tubes 51 and 52 and the rib 53 may be integrally formed as shown in FIG. If both pipes 51 and 52 are integrally molded in this way, they can be manufactured at a very low cost.

Returning to FIG. 1 again, in this embodiment, both ends of the water supply pipe 51 and the return pipe 52 have almost the same structure, and the connecting pipes 55 made of plastic are watertight at both ends of the return pipe 52. It is connected by adhesive.

The connecting cylinder 55 has a central ring 57 supported by radial ribs 56 as shown in FIG. 4 in the vicinity of the central portion thereof, and a water pipe 51 as shown in FIG. It has been inserted. It should be noted that the whole may be formed in an elliptical cross section.

On the water pipe 51, beads 58, 59 projecting outward slightly at a position immediately out of the center wheel 57.
Is formed, and the center wheels 57, 57 at both ends are sandwiched between the two beads 58, 59 and are fixed.

However, on the connection side with the radiator 3, as shown in FIG. 5, a large bead 59 is formed over the entire circumference to abut on the center wheel 57 before assembly, but the flow rate adjusting valve 20 On the connection side with, as shown in FIG.
After passing the water pipe 51 through the center wheel 57 during assembly, a small bead 58 is partially formed at a position in contact with the outside of the center wheel 57, and the backup ring 61 engaged therewith contacts the center wheel 57. Touching.

On the side of the flow control valve 20 to which such a double pipe is connected, as shown in FIG. 1, the hot water outlet 41 of the water supply pipe line 4 and the hot water inlet 42 of the return pipe line 5 are doubled. It is formed in a double cylinder structure corresponding to the water supply pipe 51 and the return pipe 52 of the pipe structure, the protruding end of the water supply pipe 51 is inserted into the inner hot water outlet 41, and the connecting pipe 55 of the connecting pipe 55 is connected to the outer hot water inlet 42. The outer peripheral tip is inserted.

Sealing O-rings 63 and 64 are attached to both the inner and outer fitting portions, and the inner O-ring 63 is pressed by a backup ring 65 as shown in FIG. 64 is pressed by the connecting tube 55.

After the connected state as described above, the flange portions 66, which are provided at the outer peripheral end portions of the both to be connected, are projected.
The connection state is fixed by sandwiching and fixing 67 with a so-called quick fastener 68 made of a leaf spring material that can be elastically opened and closed.

The radiator 3 has an inlet chamber 71 and an outlet chamber 7 inside.
It is divided into two parts, and a large number of thin water supply tubes 73 and 74 are arranged in parallel so as to communicate with the respective chambers 71 and 72, and fins 75 for heat dissipation are attached between the water supply tubes 73 and 74. .

In the inner part of the radiator 3 (not shown), the inlet chamber 71 side and the outlet chamber 72 side are gathered together. Therefore, the hot water that has entered the inlet chamber 71 and sent through the inside of the water supply tube 73 on the outgoing side changes its direction and is sent to the outlet chamber 72 through the water tube 74 on the return side. It should be noted that although packings for preventing water leakage are provided in each connection portion, their illustration is omitted.

The hot water inlet 77 and the hot water outlet 78 of the radiator 3 have the same structure as the connecting portion of the flow rate adjusting valve 20, and correspond to the double pipe water supply pipe 51 and the return pipe 52.
It has a double cylinder structure with a circular or elliptical cross section. Then, the projecting end of the water supply pipe 51 is fitted into the inner hot water inlet 77, and the outer peripheral tip of the connection tube 55 is fitted into the outer hot water outlet 78.

An O-ring 8 for sealing is provided on both the inner and outer fitting parts.
1, 82 are attached, the inner O-ring 81 is pressed by the backup ring 83 interposed between the bead 59, and the outer O-ring 82 is pressed by the connecting tube 55.

The connecting tube 55 and the radiator 3 are adjacent to each other, and flange portions 85 and 86 are provided so as to project at the outer peripheral ends of the two.
The connection state is fixed by sandwiching and fixing with a so-called quick fastener 87.

The present invention is not limited to the above-mentioned embodiment, and for example, the concrete structure of the connecting portion of the double pipe and the double cylinder may have another structure, and the water supply pipe 51 and the return pipe. 52 may have a connecting structure of the double pipe and the double cylinder as described above only for the radiator 3, and the other ends of the two pipes 51, 52 may be separated from each other and connected to each other.

[0055]

According to the present invention, due to heat exchange in the hot water circulation pipe, the temperature of the hot water entering the radiator from the water supply pipe is lowered as the flow rate of the hot water is smaller, and the temperature unevenness in the radiator is reduced. can do. Moreover, since the heat taken there is given to the return conduit side of the circulation conduit, there is almost no heat loss.

The structure required for that purpose is only to provide a double pipe for heat exchange between the water supply pipe line and the return pipe line, and the connection between the pipe and the radiator can be extremely easily performed. Therefore, the device can be constructed at a very low manufacturing cost.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an embodiment.

FIG. 2 is a partial cross-sectional view of an example.

FIG. 3 is a partial cross-sectional view of an example.

FIG. 4 is a partial cross-sectional view of an example.

FIG. 5 is a partial cross-sectional view of an example.

FIG. 6 is a partial cross-sectional view of an example.

FIG. 7 is a temperature characteristic diagram of hot water according to an example.

[Explanation of symbols]

 3 Radiator 4 Water supply pipe 5 Return pipe 51 Water supply pipe 52 Return pipe 77 Hot water inlet 78 Hot water outlet

Claims (2)

[Claims] 1. A hot water circulation type heating device in which a radiator is connected in the middle of a pipe for circulating hot water to control the heating capacity by changing the flow rate of hot water passing through the radiator. A water supply line for sending hot hot water to the container and a return line for sending cold hot water from the radiator,
One is formed in a double pipe structure surrounding the other so that heat is exchanged between the hot water passing through both pipes, and the hot water inlet and the hot water outlet of the radiator are of the double pipe structure. The water pipe and the return pipe are formed in a double cylinder structure, and the double pipe water supply pipe and the return pipe are connected to the hot water inlet and the hot water outlet of the double pipe radiator. A hot water circulation type heating device. 2. A flow rate adjusting valve for adjusting the flow rate of hot water passing through said radiator is provided in the middle of a pipe line upstream of said radiator, and said flow rate adjusting valve is hot to said radiator. The hot water outlet for sending out the hot water and the hot water inlet for receiving the cooled hot water sent from the radiator are formed in a double tube structure, and the water supply pipe line of the double pipe structure and the return pipe are formed therein. The hot water circulation heating device according to claim 1, wherein a pipeline is connected.