JPH01217150A - Heat exchanging device and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a local overheating of a coolant by a method wherein a thermal conducting partition wall cylinder having a combustion chamber diverged from a lower end of a parallel approaching plane and a coolant passage member having a vertical passage at an outer surface of the thermal conducting partition wall cylinder are provided. CONSTITUTION:Liquid coolant passed through a coolant inlet pipe 19 and entered inlet header pipes 14 and 14 is dispersed from a lower part of a coolant passage member 12 into several vertical passages 13. A thermal conducting partition wall cylinder 10 may absorb heat of combustion discharged gas passing from a combustion chamber 21 through a thermal conducting fin 16 at a parallel approaching surface 11 where the thermal conducting fin 16 is arranged and heat the coolant in the vertical passage 13 of the coolant passage member 12 thermally connected from a lower part near an inlet header pipe 14. The heated liquid coolant may start to vaparize and evaporate to become a gas-liquid two phase state in the liquid, it may ascend within the passage 13 from downward to upward directions,. flow into an outlet header pipe 15 and then flow out of a coolant outlet pipe 20 toward a radiator. An effect of agitation and disturbance of flow is generated by such an ascending flow so as to prevent an abnormal local overheating of the coolant.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application - The present invention relates to a heat exchange device that heats a refrigerant or the like using high-temperature combustion gas using gas, oil, or the like as a heat source.

BACKGROUND ART A refrigerant heating machine as shown in Fig. 4 uses a refrigerant as the fluid to be heated and heats it with combustion gas to evaporate the liquid refrigerant and transport heat by latent heat to perform heating. . In this system, a heat exchange device 1 containing a refrigerant heated by the combustion gas of a burner 1a and a radiator 2 are connected by a sealed pipe 3, and a refrigerant is forcibly transferred by a refrigerant transfer device 4 installed in the sealed pipe 3. It is something that circulates. FIG. 5 shows a conventional example of the heat exchanger 1 (JP-A-59-'+
Publication No. 07167) A plurality of fins 5 are provided on the cylindrical inner circumferential surface extending in the horizontal direction, and a pipe holding portion 6 is provided on the outer circumferential surface in the axial direction.
and a pipe 7 through which the refrigerant flows, and the combustion gas from the burner part 8 flows horizontally and laterally to the cylindrical inner surface 9 and flows through the horizontal pipe 7 sent by the refrigerant conveyor 4. It heats the refrigerant.

Problems to be Solved by the Invention The above-mentioned heating system requires external power to move the refrigerant at high speed, and it is effective to eliminate the external power for transporting the refrigerant and transport heat without power in order to reduce running costs during heating operation. . When performing refrigerant heating and heating by non-powered conveyance, the natural circulation force due to the buoyancy of the gaseous refrigerant generated when the liquid refrigerant is heated is important. However, in the configuration of the conventional heat exchange device 1 shown in FIG. 5, the refrigerant flows in the pipe 7 extending horizontally and laterally, so that the gas component of the refrigerant that is heated and in a gas-liquid two-phase mixed state can smoothly exit. Since the refrigerant does not flow toward the refrigerant, it may stagnate and cause localized abnormal overheating, leading to equipment reliability problems such as thermal decomposition of the refrigerant or abnormal temperature rise of the equipment. On the other hand, since the combustion exhaust gas radiates heat near its outlet and becomes low temperature, there is a fear that moisture in the combustion exhaust gas may condense and condense on the cylindrical inner surface of the heat exchanger 1, leading to corrosion and the like.

The present invention solves the problems of the conventional example, and aims to ensure smooth flow of refrigerant and prevent corrosion of the heat exchanger.

Means for Solving the Problems In order to solve the above problems, the heat exchange device of the present invention has a combustion gas exhaust chamber in the upper part, a parallel approach surface in the lower part, and a combustion chamber that spreads out from the lower end of the parallel approach surface. A refrigerant passage member having a vertical passage is disposed on the outer surface of the heat transfer partition tube having a chamber, a large number of heat transfer fins are provided between the parallel approach surfaces, and the exhaust chamber of the heat transfer partition tube is combusted by all means. The structure includes an exhaust connection port for the exhaust gas outlet.

Effect of the present invention With the above-described configuration, the refrigerant in the vertical passage is sufficiently heated by the heat transfer fins provided on the parallel approach surfaces, and the generation of bubbles in the refrigerant is gradually promoted from the lower position, thereby suppressing the natural circulation force due to the rise in air level. The purpose of this is to ensure that non-powered heat transfer is performed and to obtain a highly reliable system that does not cause thermal decomposition of the refrigerant. On the other hand, the flared combustion chamber of the heat transfer bulkhead eliminates stagnation of exhaust gas and prevents partial overheating.
In addition, moisture condensation in the combustion exhaust gas flows through the inclined wall of the heat transfer partition tube forming the flared combustion chamber and flows out through a hole in the burner case, causing corrosion and corrosion of the heat exchange device.
Deterioration is prevented and durability is greatly improved.

EXAMPLES Hereinafter, examples of the present invention will be described and explained based on the accompanying drawings. In FIGS. 1, 2, and 3, reference numeral 10 includes a cylindrical exhaust chamber 17 in the upper part, a pair of parallel approach parts 11 facing each other with a constant interval in the lower part, and the parallel approach part 11 in the lower part. This is a heat transfer partition cylinder having a combustion chamber 21 that widens toward the bottom. 1
Reference numeral 2 denotes a flat refrigerant passage member thermally joined to the outer surface of the heat transfer partition cylinder 10, in which a large number of vertical passages 13 are independently provided. Reference numeral 14 indicates an inlet header pipe provided at the lower end of the refrigerant passage member 12, and reference numeral 15 indicates an outlet header pipe provided at the upper end of the refrigerant passage member 12.The inlet header pipe 14 and the outlet header pipe 15 are provided in pairs on the left and right sides, respectively. They are communicated by a passage 13 in the direction. Reference numeral 16 denotes a heat transfer fin provided so as to be in thermal contact with the inside (between) the pair of parallel approach surfaces 11 . 18 is a cylindrical exhaust chamber 17
This is the exhaust gas connection port where the exhaust gas flows out. 19 is a refrigerant inlet pipe connected to the inlet header pipe 14.14, and 2o is a refrigerant outlet pipe connected to the outlet header pipe 15.15. 2
2 is a burner case configured to cover the burner part 23, and holes 26 are provided at both corners of the bottom for allowing condensed water to flow out to the outside.
This is provided. Further, it is attached to the lower opening edge of the heat transfer partition cylinder 10 via a seal packing 25. Reference numeral 24 denotes a heat shield plate attached to the heat transfer partition cylinder 10 for the purpose of heat shielding, and is attached to the burner section.

In the above configuration, the liquid refrigerant entering the inlet header pipe 14 . °
The heat transfer partition cylinder 10 absorbs the heat of the combustion exhaust gas passing through the heat transfer fins 16 from the combustion chamber 21 at the parallel approach surface 11 where the heat transfer fins 16 are provided, and connects the refrigerant passage member 12 thermally. The refrigerant in the vertical passage 13 is sufficiently heated from the lower part near the inlet header pipe 14. The heated liquid refrigerant then begins to evaporate and enters a gas-liquid two-phase state in which bubbles are generated in the liquid. The generated air bubbles rise from below to above within the vertical passage 13 due to the buoyancy effect, creating a strong natural circulation force and transporting the refrigerant to the upper part of the passage 13 along with the liquid refrigerant that has not yet vaporized. A bubble pumping action occurs. The refrigerant that has reached the upper end of the passage 1a flows into the outlet header pipe 15 and passes through the refrigerant outlet pipe 20 to the radiator (
(not shown).

By heating from the bottom to the top of the vertical passage 13 in this way, the natural circulation force is increased, and the upward flow creates a stirring turbulent flow effect to prevent local abnormal overheating of the refrigerant, thereby reducing the heat of the refrigerant. Reliability can be improved by preventing disassembly or abnormal temperature rise of equipment.

In addition, moisture condensation in the combustion exhaust gas is caused by the combustion chamber 21, which is flared at the end.
The dew water flows into the burner case 22 through the inclined wall of the heat transfer partition tube 10 that forms the dew condensation water, and then flows out through the hole 26 provided at the negative part through which the condensed water flows out to the outside, which affects the durability of the heat exchange device. does not affect

Further, the refrigerant passage member 12 is made of a multi-hole flat extruded tube made of aluminum with many holes inside, and the heat transfer fins 16 are made of belt-shaped aluminum plates bent into a corrugated, rectangular or trapezoidal shape. Thermal partition cylinder 10 is processed as a plating sheet in which the front and back sides of an aluminum core material are clad in advance with brazing material, and aluminum heat transfer fins 16 are provided on the inner and outer surfaces of the heat transfer partition cylinder 10 using this material. Then, the refrigerant passage member 12, which is a multi-hole flat extruded tube made of aluminum, is assembled, and at the same time, a part of the refrigerant passage member 12 is brazed to be thermally joined. Therefore, it is possible to put into practical use a lightweight and low-cost heat exchanger that has no contact thermal resistance and has excellent heat transfer performance.

Effects of the Invention As described above, the heat exchange device of the present invention includes a heat transfer partition cylinder having an exhaust chamber at the upper part, a parallel approach surface at the lower part, and a combustion chamber which widens from the lower end of the parallel approach surface; Since heat transfer fins are provided between the approaching surfaces and a refrigerant passage member having a vertical passage is disposed on the outer surface of the heat transfer partition cylinder, the following effects can be expected.

(1) Since the refrigerant is heated from the bottom of the passage, the bubble pump action can be strengthened, and the upward flow of the generated bubbles stirs the flow, creating a turbulent flow effect that prevents local overheating of the refrigerant and abnormal temperature rises in equipment, making it reliable. You can improve your sexuality.

(2) Non-powered heat transfer is possible due to the bubble pump action of the rising bubble flow, making it possible to provide heating at low running costs.

(3) Since the heat transfer bulkhead tube has a combustion chamber that widens toward the end, moisture condensation in the combustion exhaust gas flows through the inclined wall of the heat transfer bulkhead tube and flows out through a hole provided in a part of the burner case. Therefore, corrosion and deterioration of the heat exchange device can be prevented, and the durability of the container can be greatly improved.

(4) Heat transfer fins and heat transfer bulkhead tubes made of clad material
Since the refrigerant passage members are integrated by brazing, contact thermal resistance is low and heat transfer performance is excellent.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a heat exchange device showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line AA of the refrigerant passage member, FIG. The figure is a circuit diagram of a conventional refrigerant heater, and FIG. 5 is an external perspective view of a conventional heat exchanger. 10...Heat transfer partition cylinder, 11...Parallel approach part, 12...Refrigerant passage member, 13...
・Refrigerant passage, 16...Heat transfer fin, 17...
...Exhaust chamber, 18...Exhaust gas connection port 1.2
1... Combustion chamber, 22... Burner case, 23... Burner section. Name of agent: Patent attorney Toshio Nakao and 1 other person
---Iun Benru 3-1 No. 4-Pana rhyme 1112 Figure W! Figure 13

Claims (3)

[Claims] (1) A transmission having a cylindrical exhaust chamber in the upper part, parallel approach surfaces facing each other at a constant interval in the lower part, and a combustion chamber that gradually widens from the lower end of the parallel approach surface. A heat exchange device comprising a heat transfer partition tube, a refrigerant passage member having a vertical passage provided on the outer surface of the heat transfer partition tube, and heat transfer fins provided between parallel approaching surfaces of the heat transfer partition tube. . (2) A heat exchange device that is attached to the lower end of a heat transfer partition tube and has a hole in the bottom of a burner case that houses a burner section. (3) The refrigerant passage member is an extruded aluminum multi-hole flat extruded tube with many holes inside, the heat transfer fin is an aluminum plate bent into a corrugated, rectangular or trapezoidal shape, and the heat transfer partition tube has brazing material on the front and back surfaces. A method for producing a heat exchange device, in which a clad aluminum plate is used, the heat transfer fins are sandwiched between heat transfer partition cylinders, and a refrigerant passage member is brought into contact with the outer surface of the heat transfer partition cylinder to be heated and brazed.