JPH09229574A - Heat exchanger for heating refrigerant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient heat exchanger for heating refrigerant in a low cost by a method wherein a pipe for flowing refrigerant is wound around a cylinder provided with fins at its inner surface. SOLUTION: A pipe 2 is wound on a circumference of an outer periphery of a cylinder 1 provided with some fins at its inner side. The cylinder 1 and the pipe 2 are used for transferring heat through metallic contact. In this case, the cylinder 1 is made such that some fins are integrally formed by metallic drawn material such as aluminum at its inner side. In addition, refrigerant inlet side of the pipe 2 is arranged at an inlet port side for combustion gas. Such a quite simple structure causes the U-bent parts of the pipe to be connected and all the cylinder and pipe to be contacted to each other, resulting in that no useless state may occur in a heat transfer. In addition, a heat exchanger for heating refrigerant can be formed simply by using metallic drawn material such as aluminum which can be integrally formed with the inner side fins and at the same time the device is integrally formed with inner side fins to cause its heat transfer to be made well. Further, a heat transfer efficiency can be improved and at the same time it is possible to reduce an abnormal super-heating of the refrigerant at the refrigerant outlet port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating a refrigerant for exchanging heat with combustion gas to heat a refrigerant.

[0002]

2. Description of the Related Art In recent years, air conditioners equipped with a refrigerant heating device have been put to practical use.

A conventional example of an air conditioner equipped with the above-described refrigerant heating device will be described below with reference to the drawings.

FIG. 17 shows a conventional heat exchanger for heating a refrigerant. In the figure, reference numeral 1 is a cylinder which forms a combustion chamber and at the same time supports a pipe 2 for flowing a refrigerant and which has fins on its inner surface for transmitting heat to the pipe 2. The pipe 2 for passing the refrigerant is arranged on the surface of the cylinder 1 in the direction of the flow of the combustion gas. Also, the cylinder 1
In general, the tube 2 and the tube 2 are deformed to improve the contact by deforming the tube 2 or the tube 1 in order to improve heat conduction. When burned with heat, the heat of the generated combustion gas is transmitted to the pipe 2 through the fins inside the cylinder 1.

[0005]

However, in the refrigerant heat exchanger configured as described above, the refrigerant alternately passes between the upstream side and the downstream side of the combustion gas, so that the heat transfer efficiency is poor. Also,
This requires a man-hour for deforming the pipe in order to improve the heat transfer, which is costly. Further, although a U-bend portion is required for connecting the pipe, it has no effect on heat absorption and is wasteful.

In view of the above problems, the present invention provides a low-cost and efficient heat exchanger for heating a refrigerant.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention comprises a tube having a fin on its inner surface, around which a pipe for flowing a refrigerant is wound.

It is effective to use a metal drawing material such as aluminum for the cylinder.

Further, it is preferable to wind a pipe through which the refrigerant flows from the upstream side of combustion. Further, a flat tube such as an elliptic tube may be used as the tube through which the refrigerant flows.

Further, a circular tube can be forcibly flattened and wound as a tube through which the refrigerant flows. Further, it is preferable that the cylinder and the pipe through which the refrigerant flows are brought into close contact with each other with solder or the like.

Further, it is preferable that the groove is spirally formed on the aluminum metal tube, and the tube is wound along the spiral groove.

Further, it is preferable to wind a pipe through which a coolant flows around a flat plate having fins formed therein and shaped into a cylinder.

It is preferable that a flat plate longer than the flat plate is bonded to the flat plate by welding or the like to form a cylindrical shape, and a pipe through which a refrigerant flows is wound around the flat plate.

Further, it is preferable to fix the pipe portion of the heat exchanger through which the refrigerant flows so as to be covered with a metal pipe pressing metal fitting such as an iron plate.

Further, it is preferable to fix the pipe with an iron plate or the like with a heat insulating material sandwiched therebetween. Also, the tube is provided with several protrusions in the longitudinal direction,
It is advisable to wrap the tube and attach it with solder.

Further, the tube is provided with a plurality of protrusions in the longitudinal direction,
It is advisable to wind the pipes at an appropriate interval and close them with solder or the like.

Further, it is preferable that a pipe for flowing the refrigerant in the heat exchanger, which is smaller than the outer diameter of the cylinder and is wound into a coil, is fixed to the cylinder by utilizing the spring effect.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the invention according to claim 1 is compact and low in cost by winding a pipe through which a coolant flows around a cylinder having fins on its inner surface.

In the invention according to claim 2, the inner fin can be formed very easily by using a metal drawing material such as aluminum.

In the invention according to claim 3, an efficient heat exchanger can be obtained by winding a pipe through which the refrigerant flows from the upstream side of combustion.

In the invention according to claim 4, a flat tube such as an elliptic tube is used as a tube through which the refrigerant flows so that the contact area between the tube and the tube can be expanded and the heat exchange rate can be improved. Is.

In the invention according to claim 5, a circular tube is forcedly flattened and wound as a refrigerant flow tube,
While using a low-cost round tube, the same heat exchange rate as when using a flat tube can be obtained.

In the invention according to claim 6, the fixing and the heat transfer coefficient can be improved by bringing the cylinder and the pipe through which the refrigerant flows into close contact with each other with solder or the like.

The invention according to claim 7 uses a normal round tube by spirally forming a groove in a metal tube such as aluminum and winding the tube along the spiral groove, It is possible to improve fixing and heat transfer coefficient.

The invention according to claim 8 uses a copper plate having good heat conduction and a stainless plate having good corrosion resistance by winding a pipe through which a refrigerant is flown around a flat plate with fins formed into a cylindrical shape. It is possible.

In the invention according to claim 9, the flat plate longer than the flat plate is bonded to the flat plate by welding or the like in a wave shape is shaped into a cylinder, and a pipe through which a refrigerant flows is wound, so that the cost can be reduced. It is possible.

In the invention according to claim 10, the pipe portion for flowing the refrigerant of the heat exchanger is fixed so as to be covered with an iron plate or the like, so that it can be simply and surely fixed without requiring a special fixing metal fitting. .

Further, the invention according to claim 11 can improve the thermal efficiency by fixing the pipe with an iron plate or the like with a heat insulating material interposed therebetween.

According to the twelfth aspect of the present invention, by providing several protrusions in the longitudinal direction on the cylinder and winding the pipes and closely contacting them with solder, the flow of the solder between the pipes and the pipe is improved, and work efficiency is improved. It will improve.

According to the thirteenth aspect of the present invention, the tube is provided with a plurality of protrusions in the longitudinal direction, and the pipe is wound around at an appropriate interval and tightly adhered with solder, so that the entire pipe is evenly soldered and work is performed. It can improve sexuality and aesthetics.

Further, in the invention according to claim 14, a pipe for flowing a refrigerant in a heat exchanger is wound smaller than the outer diameter of the cylinder and is coiled to be fixed to the cylinder by utilizing a spring effect. It improves the performance and eliminates the need for special fixing brackets.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heat exchanger for heating a refrigerant according to an embodiment of the present invention will be described with reference to the drawings. In the figure, the same components as those of the conventional example are denoted by the same reference numerals, and description thereof is omitted.

Example 1 Example 1 of the present invention will be described with reference to FIG. 1 is a heat exchanger for heating a refrigerant according to a first embodiment of the present invention. Tube 1 with fins inside tube 2
The outer circumference of is wrapped around the circumference. The cylinder 1 and the tube 2 perform heat transfer by metal contact. Due to this very simple structure, the connection of the U-bend part of the pipe 2 and the pipe 1 and the pipe 2
Since all of them contact each other, there is no waste in heat transfer.

(Second Embodiment) Next, a second embodiment of the present invention will be described. The cylinder 1 shown in FIG. 1 is integrally formed with a fin on the inside by a metal drawing material such as aluminum. In this way, by using a metal drawing material such as aluminum that can be integrally molded with the inner fin, it is possible to easily mold the heat exchanger for heating the refrigerant and improve heat conduction because it is integrally molded with the inner fin. It is a thing.

Example 3 Next, Example 3 of the present invention will be described. In FIG. 2, the refrigerant inlet side of the pipe 2 is arranged on the combustion gas inlet side. That is, by the heat exchange between the low temperature portion of the inlet of the refrigerant and the high temperature portion of the combustion gas, and the low temperature portion of the exhaust side of the combustion gas and the outlet side of the refrigerant, the heat transfer efficiency is improved and at the same time, the abnormal overheating of the refrigerant at the refrigerant outlet is achieved. Can be reduced.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described. In FIG. 3, a pipe 2 for flowing a refrigerant to be wound around a cylinder 1
By using a flat tube, the contact area between the tube 1 and the tube 2 is increased and the heat transfer coefficient is increased.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described. In FIG. 4, 4 is a die for deforming the tube 2. As shown in the figure, a circular tube 2 is wound around a cylinder 1 through a die 4 so that the circular tube 2 is forcibly deformed and closely attached. Therefore, the same effect can be obtained without using a special tube such as a flat tube, so that the cost can be reduced.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described. In FIG. 5, the heat transfer coefficient between the cylinder 1 and the tube 2 is improved by filling the gap between the cylinder 1 and the tube 2 with an adhesive agent 5 such as solder to improve the heat transfer coefficient between the cylinder 1 and the tube 2, thereby providing a compact and low-cost refrigerant A heat exchanger can be provided.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described. In FIG. 6, reference numeral 6 denotes a groove formed on the circumference of the cylinder 1 so as to spirally arrange the tubes 2 at appropriate intervals. In the present invention, the tube 2 is wound around the tube 1 along the groove 6. Groove 6
With this, the position of the tube 2 can be fixed, and at the same time, the contact area with the tube 1 can be increased, so that the heat transfer coefficient between the tube 1 and the tube 2 can be improved.

(Embodiment 8) Next, an embodiment 8 of the invention will be described. In FIGS. 7 and 8, the fins 8 are provided on the copper or iron flat plate 7.
Is formed by welding or the like. The flat plate 7 with the fins 8 is formed by rounding the fins 8 inside and winding the tube 2 around the outer circumference. Compared with the above-mentioned molded product of the drawing material, the cylinder 1 constituted by the flat plate 7 does not require a mold and can be manufactured at a low cost, and the choice of materials such as a copper plate having good heat conduction and stainless steel having excellent corrosion resistance is increased. . Moreover, since the interval and height of the fins 8 can be freely selected, a heat exchanger suitable for the purpose can be provided.

(Ninth Embodiment) Next, a ninth embodiment of the present invention will be described. In FIGS. 9 and 10, 9 is a flat plate that is slightly larger than the small flat plate 10. The large flat plate 9 is deformed into a wave shape and adhered to the small flat plate 10 by welding or the like, and the corrugated plate side is formed into a round shape, and the tube 2 is wound around the outer circumference. Since the cylinder 1 of this configuration is easier to weld the fins as compared with the above-described one in which the flat plate with fins is formed,
Furthermore, it is possible to manufacture a heat exchanger for heating the refrigerant at a lower cost.

(Tenth Embodiment) Next, a tenth embodiment of the present invention will be described. In FIG. 11, reference numeral 11 is a pipe pressing fitting for fixing the pipe 2 so as to cover it. FIG. 12 is a sectional view of the heat exchanger of the present invention. When the tube 2 is fixed by the tube holding metal fitting 11, the tube 1 and the tube 2 are surely brought into contact with each other and the heat transfer coefficient is improved.

(Eleventh Embodiment) Next, an eleventh embodiment of the present invention will be described. FIG. 13 is a cross-sectional view of the heat exchanger of the present invention, and 12 is a heat insulating material formed so as to enclose the pipe 2. By using this heat insulating material 12, the heat leaked from the outside of the tube 2 to the outside can be prevented, so that the heat absorption efficiency of the tube 2 is improved.

(Embodiment 12) Next, Embodiment 12 of the present invention will be described. In FIG. 14, several protrusions 13 are arranged on the circumference of the cylinder 1. The protrusion 13 can be attached to the outer periphery of the cylinder 1 by welding or by integral molding.
By winding the tube 2 around the tube 1 provided with the protruding portion 13, a uniform gap can be formed between the tube 1 and the tube 2. By making it easy for the gap to flow with solder, the soldering of the cylinder 1 and the pipe 2 can be surely speeded up.

(Embodiment 13) Next, Embodiment 13 of the present invention will be described. In FIG. 15, the tube 2 is wound around the cylinder 1 having the protrusions 13 at an appropriate interval 14.
By doing so, when soldering, the solder is surely attached to the entire surface of the pipe 2 to improve corrosion resistance and aesthetics.

(Embodiment 14) Next, Embodiment 14 of the present invention will be described. According to the present invention, as shown in FIG. 16, a tube 2 having a winding dimension smaller than the outer diameter of the tube 1 and formed into a coil is inserted into the tube 1 while being unwound. Therefore, tube 2
Is fixed to the cylinder 1 by its spring back. In this way, it can be fixed without the need for special fixing metal fittings.

[0047]

As is apparent from the above description, the present invention is compact and low in cost by wrapping a pipe through which a refrigerant flows around a cylinder having fins on its inner surface.

The inner fin can be formed very easily by using a metal drawing material such as aluminum.

Further, by winding the pipe for flowing the refrigerant from the upstream side of combustion, an efficient heat exchanger can be obtained.

Further, by using a flat tube such as an elliptic tube as the tube through which the refrigerant flows, the contact area between the tube and the tube is expanded and the heat exchange rate is improved.

Further, by forcibly flattening and winding a circular tube as a refrigerant flow tube, it is possible to obtain the same heat exchange rate as when using a flat tube while using a low-cost round tube. is there.

Further, by fixing the space between the cylinder and the pipe through which the coolant flows with an adhesive such as solder, the fixing and the heat transfer coefficient can be improved.

Further, a groove is spirally formed on a metal tube such as aluminum, and the tube is wound along the spiral groove to improve fixing and heat transfer coefficient while using an ordinary round tube. Is possible.

Further, by winding a pipe through which a coolant flows around a flat plate with fins formed into a cylindrical shape,
It is possible to use a copper plate having good thermal conductivity or a stainless plate having good corrosion resistance.

Further, the cost can be reduced by shaping a tubular plate into which a flat plate larger than the small flat plate is bonded by welding or the like to a small flat plate and winding a pipe through which a refrigerant flows. .

Further, by fixing the pipe portion of the heat exchanger through which the refrigerant flows so as to be covered with an iron plate or the like, it is possible to simply and surely fix without the need for a special fixing metal fitting.

Further, the heat efficiency can be improved by fixing the tube with an iron plate or the like with a heat insulating material interposed therebetween.

Further, the tube is provided with a plurality of protrusions in the longitudinal direction,
By winding the pipe and closely contacting the solder, the flow of the solder between the cylinder and the pipe is improved, and the work efficiency is improved.

Further, the tube is provided with a plurality of protrusions in the longitudinal direction,
By wrapping the pipes at appropriate intervals and closely contacting them with solder, etc., the solder is evenly spread over the entire pipe, improving workability and aesthetics.

Further, a pipe in which a refrigerant flowing in the heat exchanger is wound smaller than the outer diameter of the cylinder and wound into a coil is fixed to the cylinder by utilizing the spring effect. It is unnecessary.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a heat exchanger for heating a refrigerant according to first and second embodiments of the present invention.

FIG. 2 is a perspective view of an essential part of a heat exchanger for heating a refrigerant according to a third embodiment of the present invention.

FIG. 3 is a perspective view of a main part of a heat exchanger for heating a refrigerant according to a fourth embodiment of the present invention.

FIG. 4 is a schematic view showing the production of a heat exchanger for heating a refrigerant in a fifth embodiment of the present invention.

FIG. 5 is a fragmentary sectional view of a heat exchanger for heating a refrigerant according to a sixth embodiment of the present invention.

FIG. 6 is a sectional view of a heat exchanger for heating a refrigerant according to a seventh embodiment of the present invention.

FIG. 7 is a development view of a cylinder of a heat exchanger for heating a refrigerant according to an eighth embodiment of the present invention.

FIG. 8 is a perspective view of a heat exchanger for heating a refrigerant according to an eighth embodiment of the present invention.

FIG. 9 is a development view of a cylinder of a heat exchanger for heating a refrigerant according to a ninth embodiment of the present invention.

FIG. 10 is a perspective view of a heat exchanger for heating a refrigerant according to a ninth embodiment of the present invention.

FIG. 11 is a perspective view of a heat exchanger for heating a refrigerant according to a tenth embodiment of the present invention.

FIG. 12 is a sectional view of a heat exchanger for heating a refrigerant according to a tenth embodiment of the present invention.

FIG. 13 is a cross-sectional view of a heat exchanger for heating a refrigerant according to an eleventh embodiment of the present invention.

FIG. 14 is a perspective view of a heat exchanger for heating a refrigerant according to a twelfth embodiment of the present invention.

FIG. 15 is a perspective view of a heat exchanger for heating a refrigerant according to a thirteenth embodiment of the present invention.

FIG. 16 is an assembly explanatory view of a refrigerant heating heat exchanger according to a fourteenth embodiment of the present invention.

FIG. 17 is a perspective view of a conventional refrigerant heating heat exchanger.

[Explanation of symbols]

 1 Cylinder 2 Tube 3 Burner Part 4 Die 5 Adhesive 6 Groove 7 Flat Plate 8 Fin 9 Large Flat Plate 10 Small Flat Plate 11 Pipe Pressing Metal Fitting 12 Heat Insulation Material 13 Projection 14 Spacing

Claims (14)

[Claims] 1. A heat exchanger for heating a refrigerant in which a pipe for flowing a refrigerant is wound around a cylinder having fins on its inner surface. 2. The heat exchanger for heating a refrigerant according to claim 1, wherein the cylinder is made of a metal drawing material such as aluminum. 3. The heat exchanger for heating a refrigerant according to claim 1, wherein a pipe for flowing the refrigerant is wound from an upstream side of combustion. 4. The heat exchanger for heating a refrigerant according to claim 1, wherein a flat tube such as an elliptic tube is used as a tube for flowing the refrigerant. 5. The heat exchanger for heating a refrigerant according to claim 1, wherein a tube through which the refrigerant flows is forcibly flattened and wound. 6. The heat exchanger for heating a refrigerant according to claim 1, wherein an adhesive such as solder is adhered between the cylinder and the tube through which the refrigerant flows. 7. The heat exchanger for heating a refrigerant according to claim 1, wherein a groove is spirally formed in an aluminum metal cylinder, and a tube is wound along the spiral groove. 8. A tube in which a refrigerant is flown is wound around a tube formed by shaping a flat plate with fins into a tubular shape.
The heat exchanger for heating the refrigerant according to any one of 1. 9. The refrigerant according to claim 1, wherein a small flat plate having a plate larger than the small flat plate bonded in a wave shape is shaped into a cylinder, and a pipe for flowing a refrigerant is wound around the cylinder. Heat exchanger for heating. 10. The heat exchanger for heating a refrigerant according to claim 1, wherein a pipe portion of the heat exchanger through which the refrigerant flows is fixed so as to be covered with a pipe holding metal member made of a metal such as an iron plate. 11. The heat exchanger according to claim 1, wherein the pipe portion through which the refrigerant flows is fixed by a metal such as an iron plate with a heat insulating material interposed therebetween.
The heat exchanger for heating the refrigerant according to any one of 1. 12. The heat exchanger for heating a refrigerant according to claim 1, wherein several projections are provided on the cylinder in the longitudinal direction, and the tubes are wound around and closely attached by solder. 13. The heat exchanger for heating a refrigerant according to claim 1, wherein the tube is provided with a plurality of projections in the longitudinal direction, and the tubes are wound at an appropriate interval and closely attached by solder. 14. The refrigerant heating according to any one of claims 1 to 13, wherein a pipe for flowing the refrigerant in the heat exchanger is wound smaller than the outer diameter of the cylinder and formed into a coil shape, which is fixed to the cylinder by utilizing the spring effect. Heat exchanger.