KR100518619B1 - evaporator - Google Patents

Abstract

The present invention is to improve the evaporation efficiency of the evaporator, when water is accumulated in the drip tray 44, water is pushed out from the plurality of scattering holes 44a and is distributed approximately evenly around the entire upper portion of the cold water pipe 41. Scattered water flows down and at the same time a portion of it is spirally guided by the coil 48. At that time, since water convections and the whole water contacts the cold water pipe 41, heat transfer property improves. In this way, water flows through the entire outer surface of the cold water pipe 41, and also spreads to the vicinity by the grooved pipe so that the water evaporates in the entire outer surface area.

Description

evaporator

The present invention relates to an evaporator having a structure in which a liquid refrigerant is dispersed on an outer surface of a cylinder vertically installed.

Background Art Conventionally, an evaporator having a structure that cools a liquid flowing in a tube by dispersing and evaporating a liquid refrigerant on an outer surface of a tube vertically installed is known. In such a structure, the evaporator can be made compact because the evaporation area of the liquid refrigerant can be widened with respect to the size of the evaporator.

However, when the liquid refrigerant is not scattered all over the outer surface of the tube and scattered in part, the evaporation area cannot be effectively used, and sufficient performance cannot be obtained. It is known to spray liquid refrigerant to the outside of the tube by spraying to prevent such a bias, but the configuration is complicated, such as the need for a pump to obtain the partial output from the spray, and thus the size of the equipment is increased or the cost is increased. There is a problem.

In addition, since the pipe is installed vertically, the liquid refrigerant scattered on the outer surface of the pipe flows directly down, so that the time to flow down is short, and the liquid refrigerant does not evaporate sufficiently, so that sufficient performance is not obtained. There was this. Therefore, although the structure using the grooved pipe which provided the groove | channel in the longitudinal direction on the whole outer surface of a pipe is known, it spreads only in the vicinity of the part through which a liquid refrigerant flows, and sufficient effect cannot be acquired.

The evaporator of this invention aims at solving the said subject and improving the evaporation efficiency of an evaporator.

Evaporator of claim 1 of the present invention to solve the above problems

In the evaporator which is installed in the absorption air conditioner and spreads and evaporates the liquid refrigerant on the outer surface of the cylinder vertically installed, and cooling the liquid flowing in the cylinder,

A coil wound in a spiral shape is mounted on the outer surface of the cylinder, and the scattered liquid refrigerant flows in a spiral shape along the coil.

Evaporator of claim 2 of the present invention to solve the above problems

In the evaporator which is installed in the absorption air conditioner and spreads and evaporates the liquid refrigerant on the outer surface of the cylinder vertically installed, and cooling the liquid flowing in the cylinder,

A retention means for coagulating the liquid refrigerant at the upper outer periphery of the cylinder,

The said holding means is made to have the bottom surface provided with the some scattering hole evenly along the outer periphery of the said cylinder.

The evaporator of Claim 1 of this invention which has the said structure spreads and evaporates a liquid refrigerant on the outer surface of the cylinder installed perpendicularly, and cools the liquid which flows in a cylinder. By mounting the spiral wound coil on the outer surface of the cylinder, the dispersed liquid refrigerant flows in a spiral shape along the coil, so that the outer surface of the pipe can be effectively used and the time to flow down can be extended. can do.

The evaporator of the second aspect of the present invention having the above constitution has a holding means for agglomerating the liquid refrigerant in the upper outer circumference of the cylinder, and the bottom surface is provided with a plurality of scattering holes evenly along the outer circumference of the cylinder. The accumulated liquid refrigerant can flow substantially uniformly around the entire cylinder from the scattering hole.

(Example)

EMBODIMENT OF THE INVENTION In order to make clear the structure and operation | movement of this invention demonstrated above, preferable Example of the evaporator of this invention is described below.

1 is a schematic configuration diagram of an absorption type air conditioner as an embodiment of the present invention. This absorption air conditioner is a low concentration lithium bromide aqueous solution (hereinafter referred to simply as a low concentration solution, a medium concentration solution, and a high concentration solution) depending on the concentration of lithium bromide flowing through the fin tube type heat exchanger 10a by the combustion heat of the burner 1. A medium concentration solution flowing through the first hot-liquid regenerator 10 for heating and the first gas-liquid separator 11 for separating the low-concentration solution heated by the high temperature regenerator 10 into water vapor and a medium concentration solution and the fin tube type heat exchanger 20a A low temperature regenerator 20 for reheating by water vapor from the first gas liquid separator 11, a second gas liquid separator 21 for separating the intermediate concentration solution heated by the low temperature regenerator 20 into water vapor and a high concentration solution, and The condenser 30 which cools and liquefies the water vapor from the two-gas liquid separator 21, and the double pipe part 40 which integrally formed the evaporator and the absorber are provided.

Although not shown, a fan for blowing air to the condenser 30 and the double pipe portion 40 is provided.

The high temperature regenerator 10 and the low temperature regenerator 20 are instantaneous heating methods for heating the lithium bromide solution flowing through the fin tube type heat exchangers 10a and 20a, respectively, to reduce the amount of lithium bromide solution required in the device compared to the boiler method. Therefore, the thermal efficiency at the time of heating a solution is good, and the start-up time of operation start is quick.

The condenser 30 is formed by erecting a plurality of cylindrical pipes each having a vertical and horizontal groove formed vertically on the entire inner surface thereof, and installing fins on the outside thereof. The grooves on the inner surface increase the surface area in the condenser 30, and the water vapor can be efficiently cooled by the blowing from the fan.

As shown in FIG. 2, the double pipe part 40 is formed by the cold water pipe 41 which circulates the refrigerant | coolant (water in this embodiment) of the indoor unit not shown, and the exterior 42 formed in the outer side of the cold water pipe 41. As shown in FIG. Is formed. An evaporative absorption chamber 43 is formed between the cold water pipe 41 and the exterior 42. An annular drip tray 44 is installed on the outer surface of the cold water pipe 41 of the evaporation absorption chamber 43, and an upper portion of the water dispersion for dropping water sent from the condenser 30 and the low temperature regenerator 20 to the bottom. The nozzle 45 is installed.

As shown in FIG. 3, the some spread hole 44a which penetrates the bottom surface is equally provided along the outer periphery of the cold water pipe 41 in the bottom surface of the drip tray 44. As shown in FIG. In the case of a small amount of water, the dispersion hole 44a is large enough not to flow downward due to the surface tension of the water itself, and the water is pushed out by the water pressure as the water level in the drip tray 44 increases. Therefore, while the quantity of the water which flowed out from the scattering hole 44a can be stabilized substantially, it can flow about evenly from all the scattering holes 44a. In addition, the grooved pipe in which the groove | channel of the longitudinal direction was formed in the whole outer surface is used for the part in the evaporative absorption chamber 43 of the cold water pipe 41. As shown in FIG. The use of grooved pipes makes it easier for water to penetrate the outer surface, slowing down the flow rate and spreading easily. In addition, the outer periphery of the coil 48 wound in a spiral is mounted to contact the outer surface of the cold water pipe (41). The coil 48 guides a part of the water scattered from the spray hole 44a in a spiral shape, makes effective use of the outer surface of the cold water pipe 41, and further lengthens the time until reaching the bottom. To make sure the water is evaporated.

Similarly, an annular solution receiving plate 46 is provided on the inner surface of the outer surface 42 of the evaporation absorption chamber 43, and the high concentration solution separated by the second gas-liquid separator 21 is disposed on the upper surface of the evaporation absorption chamber 43. The solution dispersion nozzle 47 dropping to () is installed. In addition, a plurality of scattering holes 46a penetrating the bottom surface of the solution receiving plate 46 are evenly provided along the inner surface of the outer surface 42. In addition, the inner surface of the outer surface 42 is roughly processed by shot blasting or the like. By roughening the surface as described above, the solution is easily penetrated to slow down the flow rate and to be easily spread. In addition, the lasing net 49 rounded in a cylindrical shape is inserted in contact with the inner surface 42 and spreads the scattered high concentration solution from side to side and increases liquid retention.

The solution circulation path 50 from the evaporation absorption chamber 43 to the high temperature regenerator 10 includes a circulation pump 51 for circulating the low concentration solution to the high temperature regenerator 10, and a high concentration solution sent from the second gas-liquid separator 21; The low temperature heat exchanger 52 for heat exchange and the high temperature heat exchanger 53 for heat exchange with the intermediate concentration solution sent from the first gas-liquid separator 11 are provided.

Overflow tubes 60 and 70 are provided in the first gas-liquid separator 11 and the second gas-liquid separator 21, respectively, and are connected to the solution circulation path 50. The overflow pipes 60 and 70 are provided with thermal valves 61 and 71 which close the flow paths when the solution temperature in each gas-liquid separator 11 or 21 becomes above a predetermined temperature.

Next, the operation of this absorption air conditioner will be described. When the low concentration solution flowing in the fin tube type heat exchanger 10a in the high temperature regenerator 10 is heated by the heat of combustion of the burner 1, the first gas-liquid separator 11 separates water vapor and an intermediate concentration solution. The separated intermediate concentration solution is lowered in the high temperature heat exchanger (53), and then supplied to the low temperature regenerator (20), and by water vapor from the first gas-liquid separator (11) when flowing in the fin tube type heat exchanger (20a). It is reheated and separated in the second gas-liquid separator 21 into water vapor and a high concentration solution. After the high concentration solution is cooled in the low temperature heat exchanger 52, the concentrated solution is dropped from the solution spread nozzle 47 to the solution dish plate 46 and is separated from the plurality of dispersion holes 46a provided in the solution dish plate 46. It is scattered along the inner surface of 42). Scattered high concentration solution is spread throughout the inner surface by the lass (49).

In addition, the water vapor is cooled by condensation from the fan (not shown) in the condenser 30, condensed into water, and is dropped from the water dispersion nozzle 45 to the drip tray 44 together with the water condensed in the low temperature regenerator 20. Is lowered. And when water collects in the drip tray 44, water is pushed out from the some dispersion | distribution hole 44a, and it spreads about the whole periphery of the cold water pipe 41 uniformly. Scattered water flows down and a portion of it is spirally guided by the coil 48. At that time, since water convections and the whole water contacts the cold water pipe 41, heat transfer property improves. Thus, water flows to the whole outer surface of the cold water pipe 41, and spreads also in the vicinity by the grooved pipe, and the whole outer surface can be utilized effectively.

The water corresponding to the evaporation heat is taken away from the circulating water flowing through the cold water pipe 41 by the evaporated water and cooled. In the indoor unit, the cooling operation is performed by the circulation water circulated to the cold water pipe 41. In addition, the vaporized water vapor is immediately absorbed by the high concentration solution of the inner surface 42. At this time, the concentrated solution generates heat of absorption on the inner surface of the outer surface 42, but is cooled by blowing from a fan (not shown). The high concentration solution absorbs water vapor to become a low concentration solution, and is sent to the low temperature heat exchanger 52 and the high temperature heat exchanger 53 by the circulation pump 51 to raise the temperature, and then heated by the high temperature regenerator 10.

As described above, according to the absorption type air conditioner of this embodiment, the following effects are obtained.

1. Since the evaporation area of water can be widened by spreading water from the plurality of spray holes 44a evenly provided along the outer circumference of the cold water pipe 41, the evaporation efficiency can be increased. In addition, since the water is pushed out by the accumulation of water, the amount of water flowing out of the scattering holes 44a can be substantially stabilized, and the water can flow approximately evenly from the entire scattering holes 44a, so that stable performance can be obtained. . Moreover, since it can implement | achieve with a simple structure, cost can be reduced.

2. The evaporation is effected by guiding a part of the water scattered from the spray hole 44a by the coil 48 in a spiral shape, and effectively using the outer surface of the cold water pipe 41, and further increasing the time to reach the bottom. It can raise efficiency. Moreover, since the coil 48 can be realized by the simple structure of providing it to the outer surface of the cold water pipe 41, cost can be reduced.

3. The structure can be simplified by the simple structure of performing evaporation and absorption in the evaporative absorption chamber 43 formed between the cold water pipe 41 and the exterior 42, so that the weight of the device can be reduced. And cost can be reduced. In addition, since the vapor is absorbed by the high concentration solution smoothly by the evaporation and absorption in the surfaces facing each other in the evaporation absorption chamber 43, the cold water pipe 41 is cooled again from the periphery, so that the efficiency is good.

4. Since the high temperature regenerator 10 and the low temperature regenerator 20 are instantaneous heating by fin tube type heat exchangers 10a and 20a, respectively, the amount of lithium bromide solution required in the apparatus can be reduced compared to the boiler type. The startup time of the start can be shortened and the weight of the instrument can be reduced. Moreover, the thermal efficiency at the time of heating a solution by a fin tube type heat exchanger is good.

Hereinafter, embodiments of the present invention have been described, but the present invention can be embodied in various forms without departing from the spirit and scope of the present invention.

For example, although the present embodiment has been described using a cooling device, for example, a cooling and heating device may be used in which heating operation is performed by converting a scattered portion of a high concentration solution and water.

In addition, although the grooved pipe was used for the cold water pipe 41 in this embodiment, it is not limited to this, For example, a smooth pipe may be used.

The evaporator is not limited to the double tube structure in which the absorber is integrated, and the evaporator can be applied as long as the evaporator is configured to disperse and evaporate the liquid refrigerant along the outer surface of the cylinder vertically installed, and to cool the liquid flowing in the cylinder.

The refrigerant and the absorbing liquid are not limited to water and lithium bromide.

As described above, according to the evaporator of the first aspect of the present invention, the evaporation efficiency of the liquid refrigerant can be increased by making effective use of the outer surface of the pipe and extending the time until the liquid refrigerant flows down. Can be raised. Moreover, since a simple structure which mounts a coil can reduce cost.

Moreover, according to the evaporator of Claim 2 of this invention, since the evaporation efficiency of a liquid refrigerant can be made high by flowing a liquid refrigerant substantially uniformly around the cylinder, cooling performance can be made high. Moreover, since it is a simple structure, cost can be reduced.

1 is a schematic configuration diagram of an absorption type air conditioner as an embodiment;

2 is a cross-sectional view of the double pipe portion,

3 is a perspective view of a cold water pipe.

※ Explanation of symbols for main parts of drawing

10: high temperature regenerator 20: low temperature regenerator

30: condenser 40: double pipe

41: cold water pipe 42: appearance

43: evaporation absorption chamber 44: drip tray

44a: scatter hole 48: coil

Claims (2)

In the evaporator which is installed in the absorption air conditioner and spreads and evaporates the liquid refrigerant on the outer surface of the vertically installed cylinder, and cools the liquid flowing in the cylinder, And a coil wound in a spiral shape on the outer surface of the cylinder and flowing the dispersed liquid refrigerant in a spiral shape along the coil. In the evaporator installed in the absorption air conditioner, the evaporator for dispersing and evaporating the liquid refrigerant on the outer surface of the vertically installed cylinder, and cooling the liquid flowing in the cylinder, A retention means for holding the liquid refrigerant around the upper outer periphery of the cylinder, And the retention means has a plurality of scattering holes on the bottom surface evenly along the outer circumference of the cylinder.