JPS6125992B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention is an absorption refrigerator using Freon as a refrigerant.
This relates to a forced circulation generator using a solution pump.

In the generator of a conventional fluorocarbon absorption refrigerator, the combustion device is placed at the bottom, and the flame is directed upward, creating a flow parallel to the solution flowing into the heating tube. In addition, a 2- to 3-pass pipe is configured for a plurality of combustion devices.
The former has a poor heat transfer coefficient due to parallel flow, and also has poor workability with service personnel because the combustion device is placed below. The latter uses multiple combustion devices to control capacity, so the control device is expensive, and the combustion devices are large and have two or three passages of heating tubes, which causes problems such as poor solution distribution. There are drawbacks.

The present invention aims at improving the heat transfer coefficient of the generator.

In order to achieve the above object, the present invention inserts a coiled heating tube whose upper part is almost in close contact with the cylinder forming the combustion chamber and whose lower part has an appropriate gap,
A combustion gas passage is formed from the center of the coiled heating tube through the gap to communicate between the cylinder inner wall and the coiled heating tube, and a flame is emitted downward to the center of the coiled heating tube. A combustion device is disposed at the upper end of the cylinder, a chimney is provided on the outer wall of the upper part of the cylinder, a plurality of fins are provided on the outer periphery of the coiled heating tube, the fluid inlet of the heating tube is located at the lower end of the cylinder, and the outlet is located at the lower end of the cylinder. is provided at the upper end of the cylinder, and the fluid passage connected to the fluid inlet is brought into contact with the bottom plate of the cylinder in a heat exchange manner.

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a combustion device disposed above that heats a heating tube 8 to produce a high-temperature concentrated liquid 4 (a solution with high refrigerant concentration) at the outlet. The heating tube 8 is wound into a coil and is in close contact with the heat transfer fins 13. The heat transfer fins 13 are composed of gap fins 14 and contact fins 17 as shown in FIG.
Closely connected to 5. Headers 5, 6 and cooling pipe 7
The purpose of the cooling device constructed as shown in FIG. 3 is to cool the heating plate 12 heated by the radiant heat of the flame 2. The inlet concentration 3 is preheated in the cooling tube 7 section, heated in the heating tube 8, and becomes the outlet high temperature concentrated liquid 4, which is circulated. On the other hand, the combustion gas 9 is heat exchanged on the flame 2 side of the heating tube 8, and in this part becomes a flow opposite to the solution flow, and heat is exchanged by radiant heat transfer and convective heat transfer.
Further, the gas passes between the gap fins 14 and exchanges heat by convection heat transfer at the heat transfer fins 13, becomes the heat exchange gas 10, becomes the exhaust gas 11, and is discharged from the chimney 16. The combustion device 1 is designed to be able to change the amount of fuel and air in several stages, whereas the heating tube 8 is
Since it is a passage, there is no need to worry about the solution flowing unevenly even during full load or volume control. Also, since the combustion device is located at the top, it is easy to service. Furthermore, the flame 2 side of the heating tube 8 and the heat transfer fin 1
Heat transfer occurs on both sides of the third side, resulting in counterflow and improved heat transfer performance. Furthermore, since there is only one combustion device, it is possible to reduce the size and cost.

Since the present invention is configured as described above, the heat transfer coefficient of the generator is improved.

[Brief explanation of the drawing]

FIG. 1a is a plan view of the present invention, FIG. 1b is a longitudinal sectional view, FIG. 2 is a plan view of a heat transfer fin, and FIG. 3 is a plan view of a cooling pipe. 1... Combustion device, 2... Flame, 3... Inlet concentrated liquid, 4... Outlet high temperature concentrated liquid, 5... Left header, 6...
...Right header, 7...Cooling pipe, 8...Heating pipe, 9...
... Combustion gas, 10 ... Heat exchange gas, 11 ... Exhaust gas, 12 ... Superheating plate, 13 ... Heat transfer fin, 1
4...Gap fin, 15...Outer cylinder, 16...Chimney, 17...Close fin.

Claims (1)

[Claims] 1. A heating tube wound into a coil is inserted into the cylinder that forms the combustion chamber, and the upper part is almost in close contact with the lower part with an appropriate gap. A combustion device is disposed at the upper end of the cylinder to form a combustion gas passage communicating with the coiled heating tube and emit flame downward into the center of the coiled heating tube, and a chimney is provided on the outer wall of the upper part of the cylinder. A plurality of fins are provided on the outer periphery of the coiled heating tube, a fluid inlet of the heating tube is provided at the bottom end of the tube, an outlet is provided at the top end of the tube, and a fluid passage connected to the fluid inlet is provided in the tube. A generator for an absorption chiller that is in contact with the bottom plate of the generator in a heat exchange manner.