JP2003336933A - Flooded-double tube evaporator and ammonia absorption refrigerating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flooded-double tube evaporator capable of suppressing the rise of moisture density in refrigerant solution by efficiently taking out the refrigerant solution with a high moisture density from the inside of a refrigerant liquid chamber 16 while preventing a convection mixing on the axial inside front and rear sides of the tubular refrigerant liquid chamber 16. <P>SOLUTION: The refrigerant liquid in refrigerant vapor evaporated from the refrigerant solution in the refrigerant liquid chamber 6 is releasably collected in a vapor-liquid separator 21 and returned to the inside of the refrigerant liquid chamber 16 through a refrigerant liquid feed pipe 18. A refrigerant solution feed port 19 is provided at the axial one end part of the outer tube 14, and a refrigerant vapor outlet 24 for discharging the refrigerant vapor and a refrigerant solution outlet 20 for taking out the refrigerant solution are provided the end part of the vapor-liquid separator 21 on the same side as the axial other end of the outer tube. The refrigerant solution and refrigerant vapor are allowed to flow in the refrigerant liquid chamber 16 and the vapor-liquid separator 21 along the axial direction of the tube. A partition body 15 for axially partitioning at least an upper side portion in the refrigerant liquid chamber 16 into front and rear parts and a dam-like member 26 for axially partitioning the bottom side portion of the vapor-liquid separator 21 into front and rear parts are installed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner-outer double cylinder having an outer cylinder and an inner cylinder, the cylinder axis direction of which is horizontal.
A liquid-filled double-tube evaporator formed in a refrigerant liquid chamber in which a refrigerant solution flows between an outer cylinder and an inner cylinder, and in a cooling medium chamber in which a medium to be cooled flows in an inner cylinder, and the full liquid The present invention relates to an ammonia absorption refrigerator having a double-tube evaporator.

[0002]

2. Description of the Related Art First, the above-mentioned ammonia absorption refrigerator is
This is an absorption refrigerator using an aqueous ammonia solution as a working medium, and a general refrigeration cycle thereof will be described with reference to FIG. 9. Evaporation pressure Pe (eg 0.29MP
Ammonia vapor evaporated in the evaporator 1 under aat-10 ° C) is absorbed in the aqueous ammonia solution in the absorber 2 so as to be maintained at the evaporation pressure Pe. Absorption heat generated at that time is released to outside by cooling water or the like. The concentrated solution generated by absorbing the ammonia vapor (solution in which the ammonia concentration is increased by absorbing ammonia) is increased in pressure by the solution pump 9, and after heat recovery via the solution heat exchanger 8,
It is sent to the rectifier 4. Then, the concentrated solution flowing down to the generator 3 has a condensation pressure Pc (for example, 1.55 MPaG at).
It is heated by an external heat source vapor or the like at 40 ° C.) to generate ammonia vapor. However, since the boiling point difference between ammonia and water is not so large, the generator 3 produces ammonia vapor containing water. This ammonia vapor enters the rectifier 4 and the partial condenser 5, and a part of the refrigerant solution generated in the condenser 6 is returned to the partial condenser 5 by the reflux pump 10 to supercool the vapor by self-evaporation. The water is condensed to remove the water in the steam. Then, it is purified to a high-concentration (high-purity) ammonia vapor (for example, 99.8% or more) as shown in FIG. 2 and sent to the condenser 6, where it is liquefied by cooling with cooling water or the like to form an ammonia solution. (Refrigerant solution).

The refrigerant solution passes through the expansion valve 7 and enters the evaporator 1 through the refrigerant solution supply port 19 and evaporates by removing heat from the medium to be cooled (for example, brine) flowing from the brine inlet 22 and then evaporated ammonia. The vapor is absorbed in a rare solution sprayed in the absorber 2 (a solution in which ammonia is partially evaporated in the generator 3 to reduce the ammonia concentration). At this time, since the water contained in the refrigerant solution is less likely to evaporate than the ammonia, the water concentration in the refrigerant solution in the evaporator 1 is increased and the boiling point (evaporation temperature) is increased as shown in FIG. Occurs. FIG. 3 shows the rise of the evaporation temperature under each condition in which the evaporation temperature of the refrigerant is changed by changing the evaporation pressure. Before entering the evaporator 1, the refrigerant solution is passed through the subcooler 11 for recovering the cold heat of the ammonia vapor discharged from the evaporator 1 and the bleed heat exchanger 12B to be cooled.

When the boiling point of the refrigerant solution rises, the difference between the temperature of the medium to be cooled (brine) and the evaporation temperature of the refrigerant decreases, the heat exchange amount of the evaporator 1 decreases, and a predetermined amount is set at the brine outlet 23. The brine outlet temperature cannot be obtained. Therefore, the ammonia concentration of the refrigerant solution in the evaporator 1 is changed to the ammonia concentration of the refrigerant solution from the condenser 6 (for example, 99.
8%), the boiling point increase can be suppressed to about 1 ° C., specifically, 96 to 97% (see FIG. 3). That is, it is necessary to remove the same amount of water as the water in the refrigerant solution sent from the condenser 6.
However, it is impossible to remove only water, so
Refrigerant solution containing water (ammonia concentration 96-97%)
Is used as a bleed, and 4 to 5% of the refrigerant circulation amount (the amount of the refrigerant solution sent from the condenser 6) is taken out from the evaporator 1.

In order to efficiently remove the water content in the refrigerant solution, it is necessary to take out the refrigerant solution at the position where the water content in the refrigerant solution is the highest. Therefore, brine entrance 2
In the vicinity of 2, the temperature difference between the brine and the refrigerant solution is large, that is, the heat flakes are large and the evaporation is active, and the water concentration in the refrigerant solution tends to be the highest.
Further, by making the flow of the refrigerant solution in the refrigerant liquid chamber in one direction, the water concentration gradually increases as the refrigerant solution flows, so that the flow directions of the refrigerant solution and the brine are opposite to each other along the cylinder axis direction. The brine exit 23
The coolant solution supply port 19 is disposed on the side, and the bleed outlet 20B is provided on the side of the brine inlet 22.
The high-moisture-concentration refrigerant solution taken out through the bleed outlet 20B is transferred to the evaporator 1 through the bleed heat exchanger 12B.
After being cooled and recovered by the refrigerant solution before entering, it is sent to the absorber 2.

Although not an ammonia absorption refrigerator, in the field of ammonia compression refrigerator, in order to prevent carry-over of an unevaporated refrigerant solution at the time of evaporation of the refrigerant from the evaporator, A technique is known in which an accumulator (gas-liquid separator) is connected to the upper side to separate and collect the refrigerant liquid from the flow of the refrigerant vapor and return it to the refrigerant liquid chamber of the evaporator.

[0007]

However, in the conventional liquid-filled double-tube evaporator, when the refrigerant solution flows in the refrigerant liquid chamber along the cylinder axis direction, and the water concentration gradually increases due to the evaporation of the refrigerant. In addition, due to the convective mixing of the refrigerant solution before and after the flow along the cylinder axis direction due to the bubbles of the refrigerant vapor generated by the evaporation of the refrigerant, the refrigerant solution on the downstream side in the cylinder axis direction where the water concentration becomes high The refrigerant solution on the side tended to be mixed and uniform before and after in the cylinder axis direction. As a result, there is a problem that the refrigerant solution having a high water content cannot be efficiently taken out from the downstream side in the cylinder axis direction.

The present invention has been made in view of the above circumstances, and a first object thereof is to efficiently take out a refrigerant solution having a high water content from the refrigerant liquid chamber to increase the water content in the refrigerant solution. To provide a full-filling double-tube evaporator that can be suppressed, and a full-filling double-tube evaporator that achieves the above object while suppressing carryover of an unevaporated refrigerant solution. Is. A second object of the present invention is to provide an ammonia absorption refrigerator that is equipped with the above-mentioned liquid-filled double-tube evaporator and can maintain a good refrigerating capacity.

[0009]

A first characteristic constitution of a full-filled double-tube type evaporator according to the present invention for achieving the above first object is, as described in claim 1, A refrigerant solution supply port for the refrigerant liquid chamber is provided at one end of the cylinder in the cylinder axis direction, and the other end of the outer cylinder in the cylinder axis direction is a refrigerant vapor evaporated from a refrigerant solution in the refrigerant liquid chamber outside the refrigerant liquid chamber. A refrigerant vapor outlet to be discharged, and a refrigerant solution outlet for taking out the refrigerant solution in the refrigerant liquid chamber to the outside of the refrigerant liquid chamber, while flowing the refrigerant solution and the refrigerant vapor in the refrigerant liquid chamber along the cylinder axis direction, A partition body is provided to partition at least the upper side portion of the refrigerant liquid chamber into front and rear along the cylinder axis direction.

In the second characteristic construction, as described in claim 2, a gas-liquid separator for separating and recovering the refrigerant liquid in the refrigerant vapor evaporated from the refrigerant solution in the refrigerant liquid chamber is provided in the outer cylinder. A refrigerant liquid transfer pipe that is arranged at the upper portion and that returns the recovered refrigerant liquid discharged from the refrigerant liquid discharge port at the bottom of the gas-liquid separator to the refrigerant liquid chamber is provided, and one end portion in the cylinder axis direction of the outer cylinder A refrigerant solution supply port for the refrigerant liquid chamber,
At the end of the gas-liquid separator on the same side as the other end in the cylinder axis direction of the outer cylinder, a refrigerant vapor outlet for discharging the refrigerant vapor in the gas-liquid separator to the outside of the gas-liquid separator, and A refrigerant solution outlet for extracting the refrigerant solution in the gas-liquid separator to the outside of the gas-liquid separator is provided, and the refrigerant solution and the refrigerant vapor flow along the cylinder axis direction in the refrigerant liquid chamber and the gas-liquid separator. Together with a partition body that partitions at least the upper side portion of the refrigerant liquid chamber back and forth along the cylinder axis direction, a weir-like member that partitions the bottom side portion of the gas-liquid separator back and forth along the cylinder axis direction, It is located at the bottom of the gas-liquid separator between the refrigerant liquid outlet and the refrigerant solution outlet.

The third characteristic configuration is, in addition to the second characteristic configuration, as described in claim 3, in which the refrigerant solution before flowing into the refrigerant solution supply port is caused to flow to separate the gas-liquid. A heat exchanger for exchanging heat with the refrigerant solution in the container is provided near the refrigerant solution outlet in the gas-liquid separator.

As described in claim 4, the fourth characteristic construction is characterized in that, in addition to any one of the first to third characteristic constructions, the refrigerant solution and the cooling medium are arranged along the cylinder axis direction. While flowing in the opposite direction, the refrigerant solution supply port is arranged at the end portion in the cylinder axis direction where the outlet of the medium to be cooled from the cooling medium chamber is installed, and the refrigerant solution outlet is cooled to the cooling medium chamber. It is located at the end in the cylinder axial direction where the medium inlet is installed.

As for the characteristic constitution of the ammonia absorption refrigerator according to the present invention for achieving the above second object, as described in claim 4, the full liquid of any one of the above first to third characteristic constitution It is equipped with a double-tube evaporator.

The operation and effect will be described below. According to the first characteristic configuration of the liquid-filled double-tube evaporator according to the present invention, in the inner and outer double cylinders in which the cylinder axis direction is horizontally horizontal,
The refrigerant solution supplied to the refrigerant liquid chamber formed between the outer cylinder and the inner cylinder from the refrigerant solution supply port provided at one end in the cylinder axis direction of the outer cylinder is the outer cylinder along the cylinder axis direction in the refrigerant liquid chamber. When flowing toward the refrigerant solution outlet provided at the other end in the cylinder axis direction of the, the heat is taken from the cooling medium flowing through the cooling medium chamber formed inside the inner cylinder to remove the refrigerant vapor from the refrigerant solution in the refrigerant liquid chamber. Evaporates,
As the water concentration in the refrigerant solution increases, the generated refrigerant vapor rises and the upper part of the refrigerant liquid chamber is directed along the cylinder axis direction to the refrigerant vapor outlet provided at the other end of the outer cylinder in the cylinder axis direction. However, the partition body partitioning at least the upper portion of the refrigerant liquid chamber in the cylinder axial direction to prevent the refrigerant vapor from moving in the cylinder axial direction. Then, at the other end of the outer cylinder in the cylinder axis direction, the refrigerant vapor is discharged from the refrigerant vapor outlet to the outside of the refrigerant liquid chamber, and the refrigerant solution having a high water content is taken out of the refrigerant liquid chamber from the refrigerant solution outlet. .

That is, since the partition body partitioning at least the upper portion of the refrigerant liquid chamber can prevent the refrigerant vapor from moving in the cylinder axis direction before and after, the water concentration in the cylinder axis direction before and after the refrigerant vapor moves. Convective mixing of a high-refrigerant solution and a low-water-concentration refrigerant solution is suppressed, the high-water-concentration state of the refrigerant solution on the other end side in the cylinder axis direction is maintained, and the refrigerant solution collection provided on the other end in the cylinder axis direction It is possible to efficiently take out the refrigerant solution having a high water concentration from the outlet. Therefore,
It is possible to prevent convective mixing of the refrigerant solution before and after in the cylinder axis direction, to efficiently take out the refrigerant solution having a high water content from the refrigerant liquid chamber, and to suppress the increase of the water concentration in the refrigerant solution. A heavy-tube evaporator is provided.

According to the second characteristic configuration, in the inner-outer double cylinder having the cylinder axis direction in the horizontal lateral direction, the outer cylinder and the inner cylinder are connected from the refrigerant solution supply port provided at one end of the outer cylinder in the cylinder axis direction. The refrigerant solution supplied to the refrigerant liquid chamber formed between the gas and liquid is disposed in the refrigerant liquid chamber along the cylinder axis direction on the upper side of the refrigerant liquid chamber on the same side as the other end in the cylinder axis direction of the outer cylinder. When flowing toward the refrigerant solution outlet provided at the end of the container, heat is taken from the cooling medium flowing through the cooling medium chamber formed inside the inner cylinder to evaporate the refrigerant vapor from the refrigerant solution in the refrigerant liquid chamber. , The concentration of water in the refrigerant solution increases, the generated refrigerant vapor rises, and the refrigerant vapor outlet along the axial direction in the upper part of the refrigerant liquid chamber and the gas-liquid separator in the upper part of the refrigerant liquid chamber. Flow toward the inside of the refrigerant vapor inside the refrigerant liquid chamber in the vapor-liquid separator. Refrigerant liquid is separated and recovered, recovered refrigerant liquid discharged from the refrigerant liquid outlet of the bottom of the gas-liquid separator is returned to the refrigerant liquid chamber by the refrigerant liquid flow pipe. Further, by a partition body that partitions at least the upper side portion of the refrigerant liquid chamber back and forth along the cylinder axis direction, movement of the refrigerant vapor flowing through the upper side portion of the refrigerant liquid chamber in the front and rear direction along the cylinder axis direction is prevented, and , The refrigerant of the recovered refrigerant liquid flowing through the bottom side portion of the gas-liquid separator by the weir-shaped member provided between the refrigerant liquid outlet at the bottom of the gas-liquid separator and the refrigerant solution outlet at the end of the gas-liquid separator Movement to the solution outlet is blocked. Then, at the end on the same side as the other end in the cylinder axis direction of the outer cylinder of the gas-liquid separator, while the refrigerant vapor is discharged from the refrigerant vapor outlet to the outside of the gas-liquid separator, the refrigerant solution having a high water content is It is taken out of the gas-liquid separator from the refrigerant solution outlet.

That is, the gas-liquid separator and the refrigerant liquid transfer pipe separate and collect the refrigerant liquid in the refrigerant vapor evaporated from the refrigerant solution in the refrigerant liquid chamber and return it to the refrigerant liquid chamber, so that the carry-over of the refrigerant solution is achieved. Suppressed. At the same time, the partition body that partitions at least the upper side portion of the refrigerant liquid chamber prevents the refrigerant vapor from moving in the front-rear direction along the cylinder axis direction, and the weir-shaped member provided at the bottom of the gas-liquid separator separates the gas-liquid separator. Since the movement of the recovered refrigerant liquid flowing through the bottom side portion of the to the refrigerant solution outlet is blocked, the refrigerant solution and the water concentration in the refrigerant liquid chamber and in the gas-liquid separator are high before and after the cylinder axis direction. Convective mixing with a low refrigerant solution is suppressed, and the state in which the moisture concentration of the refrigerant solution in the gas-liquid separator on the same end side as the other end in the cylinder axis direction is high is maintained, and at the end of the gas-liquid separator. It is possible to efficiently take out the refrigerant solution having a high water concentration from the provided refrigerant solution outlet. Therefore, while suppressing carryover of the unevaporated refrigerant solution, preventing convective mixing of the refrigerant solution and the refrigerant vapor before and after in the cylinder axis direction, efficiently takes out the refrigerant solution having a high water concentration from the refrigerant liquid chamber, Provided is a liquid-filled double-tube evaporator capable of suppressing an increase in water concentration in a solution.

According to the third characteristic configuration, the refrigerant solution before flowing into the refrigerant solution supply port flows into the heat exchanger provided in the gas-liquid separator near the refrigerant solution outlet. And exchanges heat with the refrigerant solution in the gas-liquid separator. That is, by sufficiently cooling the refrigerant solution before flowing into the refrigerant solution supply port by the cold heat of the refrigerant solution in the gas-liquid separator,
While suppressing flashing, etc., the cooling capacity of the evaporator can be increased by increasing the enthalpy difference between the inlet and outlet of the refrigerant liquid chamber, while the heat held by the refrigerant solution before flowing into the refrigerant solution supply port The refrigerant in the refrigerant solution in the gas-liquid separator can be evaporated, and since the heat exchanger is incorporated in the gas-liquid separator, compared to the case where a heat exchanger is provided outside the gas-liquid separator, The device is made compact.
Therefore, it is possible to provide a liquid-filled double-tube evaporator capable of increasing the heat utilization efficiency while avoiding the complication of the device configuration.

According to the fourth characteristic configuration, the medium to be cooled from the cooling medium chamber is supplied to the refrigerant liquid chamber from the refrigerant solution supply port arranged at the end portion in the cylinder axis direction where the outlet is arranged. Refrigerant solution flows out along the cylinder axis direction and is taken out of the refrigerant liquid chamber from the refrigerant solution outlet arranged at the cylinder axis direction end where the inlet of the cooled medium to the cooling medium chamber is arranged, while, The cooled medium that has flowed into the cooling medium chamber from the inlet of the cooled medium flows in the direction opposite to the flow of the refrigerant solution in the refrigerant liquid chamber along the cylinder axis direction and flows out from the outlet of the cooled medium. To do. That is, when the refrigerant solution flows in the refrigerant liquid chamber along the cylinder axis direction, the refrigerant is evaporated by the heat taken from the cooled medium in the cooling medium chamber and the moisture concentration becomes higher as it approaches the refrigerant solution outlet, It is possible to efficiently take out the refrigerant liquid having a high water concentration from the refrigerant solution outlet, while the evaporation temperature of the refrigerant solution rises as the water concentration increases. Since the lower the temperature is, the lower the temperature is, the better the cooled cooling medium flows out from the outlet of the cooling medium located at the same end in the cylinder axis direction as the refrigerant solution supply port. Therefore,
Provided is a liquid-filled double-tube evaporator capable of enhancing a cooling effect on a medium to be cooled while suppressing an increase in water concentration in a refrigerant solution.

According to the characteristic constitution of the ammonia absorption refrigerator according to the present invention, the liquid-filled double-tube type evaporator of any one of the above-mentioned first to fourth characteristic constitutions is used for the ammonia liquid containing water. It is used as an evaporator that evaporates to cool the medium to be cooled. That is, the boiling point difference between ammonia and water is small, and the ammonia liquid as a refrigerant solution supplied to the evaporator contains water. However, the liquid-filled double pipe of any one of the first to fourth features described above. By using the evaporator of the formula, it is possible to efficiently take out a refrigerant solution having a high water concentration from the refrigerant liquid chamber and suppress an increase in the water concentration in the refrigerant solution. By using the liquid-filled double-tube evaporator having the characteristic configuration described in (3) above, it is possible to suppress carryover of the non-evaporated ammonia solution due to ammonia vapor, and further, to achieve the third or fourth characteristic configuration described above. By using the liquid double tube evaporator, it is possible to improve the heat utilization efficiency while avoiding the complication of the device configuration.
By using the liquid-filled double-tube evaporator having the fourth characteristic configuration, it is possible to enhance the cooling effect on the medium to be cooled due to the evaporation of ammonia. Therefore, the increase of the water concentration in the ammonia solution is suppressed, the carryover of the non-evaporated ammonia solution is suppressed, the efficiency of heat utilization is improved while avoiding the complication of the device configuration, and the cooling of the medium to be cooled is further suppressed. Provided is an ammonia absorption refrigerator that can maintain a good refrigerating capacity by using a liquid-filled double-tube evaporator that can enhance the effect.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION First to second embodiments of a liquid-filled double-tube type evaporator according to the present invention will be described with reference to a case where an ammonia absorption refrigerator is equipped. The basic configuration of the ammonia absorption refrigerator has already been described with reference to FIGS. 9, 2 and 3, and thus redundant description will be omitted below.

[First Embodiment] As shown in FIGS. 1, 4 and 5, in the first embodiment, a liquid-filled double-tube evaporator 1 is used.
Is an inner-outer double cylinder composed of an outer cylinder 13 and an inner cylinder 14 and having a cylinder axis direction that is horizontally horizontal. In the refrigerant liquid chamber 16 in which an aqueous ammonia solution as a refrigerant solution flows between the outer cylinder 13 and the inner cylinder 14. The inside of the inner cylinder 13 is formed in a cooling medium chamber 17 in which brine as a medium to be cooled flows. In addition,
The outer cylinder 13 and the inner cylinder 14 are formed into a cylinder. Further, an accumulator 21 as a gas-liquid separator that separates and collects the refrigerant liquid in the refrigerant vapor that has evaporated from the refrigerant solution in the refrigerant liquid chamber 16 is arranged in the upper part of the outer cylinder 13, and the bottom part in the accumulator 21 is arranged. Refrigerant liquid discharge port 25
A refrigerant liquid transfer pipe 18 for returning the recovered refrigerant liquid discharged from the inside of the refrigerant liquid chamber 16 is provided. The refrigerant liquid chamber 16
The upper side of the accumulator 21 and the accumulator 21 are communicatively connected by three communicating pipes 21A arranged at intervals along the cylinder axis direction.

A refrigerant solution supply port 19 for the refrigerant liquid chamber 16 is provided at one end of the outer cylinder 13 in the cylinder axis direction, and at the end of the accumulator 21 on the same side as the other end of the outer cylinder 13 in the cylinder axis direction. , A refrigerant vapor outlet 24 for discharging the refrigerant vapor in the accumulator 21 to the outside of the accumulator 21, and a refrigerant solution outlet 20 for taking out the refrigerant solution in the accumulator 21 to the outside of the accumulator 21 are provided in the refrigerant liquid chamber 16 and the inside. In the accumulator 21, a refrigerant solution (ammonia solution) and a refrigerant vapor (ammonia vapor) are caused to flow along the cylinder axis direction, and at least an upper part of the refrigerant liquid chamber 16 is partitioned into front and rear along the cylinder axis direction. And a weir-like member 26 for partitioning the bottom side portion of the accumulator 21 back and forth along the cylinder axis direction.
Is provided at the bottom of the accumulator 21 between the refrigerant liquid outlet 25 and the refrigerant solution outlet 20. In addition,
The partition body 15 has a doughnut-shaped refrigerant liquid chamber 16 in cross section.
The plate body is erected so as to cover not only the upper portion of the refrigerant liquid chamber 16 but also the central portion of the refrigerant liquid chamber 16.

With the above arrangement, the refrigerant vapor generated by the refrigerant solution in the refrigerant liquid chamber 16 absorbing the heat of the brine in the cooling medium chamber 17 and evaporating rises to the upper side portion in the refrigerant liquid chamber 16. When flowing, the partition body 15 prevents movement in the front-rear direction along the cylinder axis direction, and suppresses convective mixing of the refrigerant solution. Then, while the refrigerant vapor flows into the accumulator 21 located in the upper portion of the refrigerant liquid chamber, in the lower side portion of the refrigerant liquid chamber 16, the refrigerant solution in which the refrigerant vapor has evaporated and the water concentration has increased becomes in the cylinder axis direction. Flowing along.

When the refrigerant vapor flowing into the accumulator 21 flows along the cylinder axis direction, the refrigerant liquid in the vapor is separated and recovered and flows down to the bottom of the accumulator 21,
The bottom side portion of the accumulator 21 flows along the cylinder axis direction. At this time, the separated and collected refrigerant liquid is dammed by the dam member 26 and discharged from the refrigerant liquid discharge port 25. Is also prevented from flowing to the refrigerant solution outlet 20 located on the rear side. As a result, the refrigerant solution having a high water content that flows through the lower portion of the refrigerant liquid chamber 16 rises to the position of the refrigerant solution outlet 20 of the accumulator 21. Thus, the refrigerant solution having a high water concentration can be efficiently taken out.

Further, the refrigerant solution (ammonia solution) in the refrigerant liquid chamber 16 and the medium to be cooled (brine) in the cooling medium chamber 17 flow in opposite directions along the cylinder axis direction, and the refrigerant solution supply port 19 is the cooling medium chamber 17
Is arranged at the end in the cylinder axis direction where the outlet 23 for the medium to be cooled is installed, and the refrigerant solution outlet 20 is arranged at the end in the cylinder axis where the inlet 22 for the medium to be cooled to the cooling medium chamber 17 is installed. It is located in the section. The refrigerant solution (ammonia solution) in the refrigerant liquid chamber 16 and the cooled medium (brine) in the cooling medium chamber 17 flow in the opposite direction (counterflow) in the same direction (parallel). FIG. 6 shows the temperature distribution of each liquid in the case of the comparative example flowing in a flow). The cooling effect on the medium to be cooled (brine) will be described based on FIG. In the case of the counter flow shown in FIG.
The outlet temperature of the medium to be cooled (brine) becomes higher than the temperature of the inlet port of the refrigerant solution (ammonia solution) by the cooling temperature difference (pitch point), and in the case of the parallel flow in FIG. The outlet temperature of the medium (brine) is higher than the outlet temperature of the refrigerant solution (ammonia solution) by the cooling temperature difference (pitch point), but as described above,
Since the outlet temperature of the refrigerant solution (ammonia solution) becomes higher as the water concentration rises compared to the supply port temperature, the outlet temperature of the medium to be cooled (brine) becomes lower in the case of the counter flow, and the cooled target becomes cooler. It can be seen that the cooling effect on the medium (brine) is high.

Further, the refrigerant solution before flowing into the refrigerant solution supply port 19 is caused to flow therethrough, and the accumulator 21.
A heat exchanger (hereinafter, referred to as a bleed heat exchanger) 12 for exchanging heat with the refrigerant solution therein is provided in the accumulator 21 near the refrigerant solution outlet 20. In other words, this bleed heat exchanger 12 has the accumulator 21.
Built in, the device is compactly constructed.

However, as shown in FIG. 7, an independent bleed heat exchanger 12A is provided outside the accumulator 21 without incorporating the bleed heat exchanger into the accumulator 21.
May be provided as.

[Second Embodiment] In the second embodiment,
The liquid-filled double-tube evaporator 1 has the same configuration as that of the first embodiment, except that the vapor-liquid separator (accumulator) 21 and the refrigerant liquid transfer pipe 18 are not provided. Less than,
The difference will be described. As shown in FIG. 8, a refrigerant solution supply port 19 for the refrigerant liquid chamber 16 is provided at one end of the outer cylinder 13 in the cylinder axis direction, and the inside of the refrigerant liquid chamber 16 is provided at the other end of the outer cylinder 13 in the cylinder axis direction. Refrigerant vapor outlet 24A for discharging the refrigerant vapor evaporated from the refrigerant solution to the outside of the refrigerant liquid chamber 16, and
A coolant solution outlet 20A for extracting the coolant solution in the coolant liquid chamber 16 to the outside of the coolant liquid chamber 16 is provided, and the coolant solution (ammonia solution) and the coolant vapor (ammonia vapor) in the coolant liquid chamber 16 in the cylinder axis direction. A partition body 1 that flows along the above-described structure and partitions at least an upper side portion (in the figure, an upper side portion and a central portion) in the refrigerant liquid chamber 16 into front and rear along the cylinder axis direction.
5A is provided. In addition, above the partition body 15A of the refrigerant liquid chamber 16, a vapor passage 27 communicating with the cylinder axis direction is provided.
Are formed.

With the above structure, the refrigerant solution generated in the refrigerant liquid chamber 16 takes away the heat of the brine in the cooling medium chamber 17 to evaporate, and the generated refrigerant vapor rises to the upper portion of the refrigerant liquid chamber 16. When flowing, the partition body 15 prevents movement in the front-rear direction along the cylinder axis direction, and suppresses convective mixing of the refrigerant solution. Then, the refrigerant vapor flows through the vapor passage 27 formed in the upper portion of the refrigerant liquid chamber to the refrigerant vapor outlet 24A. on the other hand,
In the lower portion of the refrigerant liquid chamber 16, the refrigerant solution in which the refrigerant vapor is evaporated and the water concentration is increased flows along the cylinder axis direction, and the refrigerant solution in which the water concentration is increased is discharged from the refrigerant solution outlet 20A. It can be taken out efficiently. Although not shown, the refrigerant vapor discharged from the refrigerant vapor outlet 24A and the refrigerant solution taken out from the refrigerant solution outlet 20A are similar to the path shown in FIG. To the absorber 2 via the bleed heat exchanger 12A.

[Other Embodiment] Next, another embodiment of the liquid-filled double-tube evaporator according to the present invention will be described. In the first and second embodiments described above, the outer cylinder 1 forming the inner and outer double cylinders.
3 and the inner cylinder 14 are formed into a cylinder, the outer cylinder 13 and the inner cylinder 1
4 can be formed in various tubular shapes other than a cylinder.

In the first and second embodiments, only one partition body 15, 15A provided in the refrigerant liquid chamber 16 is provided. However, a plurality of partition bodies 15 and 15A are arranged at intervals along the cylinder axis direction. Good.

The liquid-filled double-tube evaporator according to the present invention is used as an evaporator of an absorption refrigerating machine other than the ammonia absorption refrigerating machine using the aqueous ammonia solution described in the above embodiment as a working medium. May be.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a refrigeration cycle of an ammonia absorption refrigerator according to a first embodiment.

FIG. 2 is a graph showing the relationship between rectification temperature and ammonia concentration.

FIG. 3 is a graph showing the relationship between the water concentration in the ammonia solution and the rise in evaporation temperature.

FIG. 4 is a front view showing the structure of a liquid-filled double-tube evaporator according to the first embodiment.

FIG. 5 is a side sectional view showing the structure of a liquid-filled double-tube evaporator according to the first embodiment.

FIG. 6 is a view showing a liquid flow and a liquid temperature distribution in a full-fill double-tube evaporator.

FIG. 7 is a front view showing a modified example of the liquid-filled double-tube evaporator according to the first embodiment.

FIG. 8 is a front view and a side cross-sectional view showing the structure of a liquid-filled double-tube evaporator according to a second embodiment.

FIG. 9 is a diagram for explaining a refrigeration cycle of a conventional ammonia absorption refrigerator.

[Explanation of symbols]

12 heat exchanger 13 outer cylinder 14 Inner cylinder 15 partitions 15A partition 16 Refrigerant liquid chamber 17 Coolant chamber 19 Refrigerant solution supply port 18 Refrigerant liquid transfer pipe 20 Refrigerant solution outlet 20A refrigerant solution outlet 21 gas-liquid separator 22 Coolant inlet 23 Coolant outlet 24 Refrigerant vapor outlet 24A refrigerant vapor outlet 25 Refrigerant liquid outlet 26 Weir member

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshihiko Tanaka             1 of 600 Kuse-Denjo-cho, Minami-ku, Kyoto-shi, Kyoto Prefecture               Takuma Kyoto Factory F-term (reference) 3L093 BB01 LL05 MM02                 3L103 AA37 BB33 CC18 DD08 DD38

Claims (5)

[Claims] 1. In an inner-outer double cylinder composed of an outer cylinder and an inner cylinder, the cylinder axis direction of which is horizontally horizontal, a refrigerant liquid chamber in which a refrigerant solution flows between the outer cylinder and the inner cylinder, and the inside of the inner cylinder A full-liquid double-tube evaporator formed in each of the cooling medium chambers through which the medium to be cooled flows, wherein a refrigerant solution supply port for the refrigerant liquid chamber is provided at one end of the outer cylinder in the cylinder axis direction, At the other end in the cylinder axis direction, a refrigerant vapor outlet for discharging the refrigerant vapor evaporated from the refrigerant solution in the refrigerant liquid chamber to the outside of the refrigerant liquid chamber, and a refrigerant for taking out the refrigerant solution in the refrigerant liquid chamber to the outside of the refrigerant liquid chamber. A solution outlet is provided to allow a refrigerant solution and a refrigerant vapor to flow in the refrigerant liquid chamber along the cylinder axis direction, and a partition body for partitioning at least the upper side portion of the refrigerant liquid chamber back and forth along the cylinder axis direction is provided. Full-filled double-tube evaporator. 2. In an inner-outer double cylinder composed of an outer cylinder and an inner cylinder whose cylinder axis direction is horizontally horizontal, a refrigerant liquid chamber in which a refrigerant solution flows between the outer cylinder and the inner cylinder, and the inside of the inner cylinder are A full-liquid double-tube evaporator formed in each of the cooling medium chambers through which the medium to be cooled flows, and a gas-liquid separator that separates and collects the refrigerant liquid in the refrigerant vapor evaporated from the refrigerant solution in the refrigerant liquid chamber. And a refrigerant liquid transfer pipe for returning the recovered refrigerant liquid discharged from the refrigerant liquid discharge port at the bottom of the gas-liquid separator to the refrigerant liquid chamber, while the container is disposed on the upper portion of the outer cylinder, the outer cylinder The one end portion of the gas-liquid separator on the same side as the other end portion of the outer cylinder in the cylinder axis direction is provided with a refrigerant solution supply port for the refrigerant liquid chamber at one end portion in the cylinder liquid direction of the inside of the gas-liquid separator. A refrigerant vapor outlet for discharging refrigerant vapor to the outside of the gas-liquid separator, and
Providing a refrigerant solution outlet for taking out the refrigerant solution in the gas-liquid separator to the outside of the gas-liquid separator, the refrigerant solution and the refrigerant vapor in the refrigerant liquid chamber and in the gas-liquid separator along the cylinder axis direction. While flowing, a partitioning body that partitions at least the upper side portion of the refrigerant liquid chamber back and forth along the cylinder axis direction is provided, and a weir-like member that partitions the bottom side portion of the gas-liquid separator forward and backward along the cylinder axis direction. A full-liquid double-tube evaporator provided at the bottom of the gas-liquid separator between the refrigerant liquid outlet and the refrigerant solution outlet. 3. A heat exchanger that allows the refrigerant solution before flowing into the refrigerant solution supply port to flow therethrough to exchange heat with the refrigerant solution in the gas-liquid separator is used as the refrigerant solution in the gas-liquid separator. The liquid-filled double-tube evaporator according to claim 2, which is provided in the vicinity of the outlet. 4. A cylinder shaft in which the refrigerant solution and the medium to be cooled are caused to flow in opposite directions along a cylinder axis direction, and the refrigerant solution supply port is provided with an outlet for the medium to be cooled from the cooling medium chamber. It is arranged at the end portion in the direction of the cylinder, and the refrigerant solution outlet is arranged at the end portion in the cylinder axis direction where the inlet of the medium to be cooled to the cooling medium chamber is arranged. Liquid double-tube evaporator. 5. An ammonia absorption refrigerator comprising the liquid-filled double-tube evaporator according to any one of claims 1 to 4.