JP2979379B2 - Absorption refrigerator heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a heat exchanger used for an evaporator, an absorber, a condenser, a low-temperature regenerator and the like in an absorption refrigerator, and more particularly to an improvement in heat exchange performance and an apparatus for the same. The present invention relates to a heat exchanger of an absorption refrigerator suitable for downsizing.

[0002]

2. Description of the Related Art Such a conventional heat exchanger of an absorption refrigerator has been described in, for example, JP-A-6-42837.

FIGS. 4, 5 and 6 show an example of a heat exchanger portion in a heat exchanger of a conventional absorption refrigerator. The heat exchanger shown in FIG. 4 is a cell and coil type heat exchanger.

[0004] In the cell and coil type heat exchanger, the refrigerant liquid 6 sprayed from below a plurality of droplets in the dripper 7 falls on the coiled pipe 8. Then, as shown by an arrow in FIG. 4, the refrigerant liquid 6 flowing on the surface of the coiled pipe 8 evaporates, so that heat of the circulating water flowing in the coiled pipe 8 is taken away. That is, the refrigerant liquid 6 sprayed from below the plurality of droplets in the dripper 7
It gradually evaporates while flowing down on the surface of.

Here, for example, at a position 8a on the surface of the coiled pipe 8 in FIG. 4, a portion where the refrigerant liquid 6 does not flow partially occurs, that is, the refrigerant liquid 6 is formed on the surface of the coiled pipe 8. It is considered that a drift has occurred in the flow of No. 6.

However, the refrigerant liquid 6 is supplied to the position 8a from another portion on the surface of the coiled pipe 8 as indicated by an arrow in the figure.

In the cell-and-tube heat exchanger shown in FIG. 5, the refrigerant liquid 6 flowing on the surfaces of the plurality of tubes 9 evaporates as indicated by arrows in FIG. Take away the heat of the circulating water flowing inside.

Then, for example, at a position 9a on the surface of the tube 9 in FIG.
Even if there is a portion where the gas does not flow, the coolant liquid 6 is supplied to the position 9a from another portion on the surface of the tube 9 as indicated by an arrow in the figure.

On the other hand, the bellows plate type heat exchanger shown in FIG. 6 uses a corrugated bellows plate 3 whose heat transfer surface is processed by continuously bending a thin plate. Then, circulating water is circulated through a chamber formed by using one surface of the bellows plate 3, and the refrigerant liquid 6 is formed on the other surface of the bellows plate 3.
Flow. Then, the circulating water is cooled using the heat of vaporization of the refrigerant liquid 6.

[0010] The bellows plate type heat exchanger thus constructed has a corrugated plate-like heat transfer surface, and thus has a lower heat-exchange capacity than the cell-and-coil type heat exchanger and the cell-and-tube type heat exchanger. The heat transfer surface area can be increased in a limited space, and an evaporator, an absorber and the like having a high heat exchange rate can be provided.

[0011]

However, in the above-mentioned conventional heat exchanger of the bellows plate type, the bellows plate 3
The refrigerant liquid 6 is dropped from the distribution dropping portion of the refrigerant liquid 6 provided above the heat transfer surface to each heat transfer surface divided by each curved surface of the bellows plate 3, and one heat transfer surface to another heat transfer surface. Since the coolant liquid 6 hardly flows into the surface, there is a problem that a portion 3x where the coolant liquid 6 does not flow easily occurs in the bellows plate 3.

That is, the refrigerant liquid 6 dropped from the position above the bellows plate 3 gradually evaporates in the process of flowing down the heat transfer surface of the bellows plate 3, so that the lower the heat transfer surface, the more the refrigerant liquid 6 The liquid 6 tends to drift.

[0013] Even if there is a part where the refrigerant liquid 6 does not flow due to a drift on the heat transfer surface, the refrigerant liquid 6 is not supplied to the other part from the other heat transfer surface. In this case, the effective utilization rate of the heat transfer surface in the whole was lowered, and the heat exchange performance was lowered.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat exchanger for an absorption refrigerator capable of reducing the occurrence of drift of refrigerant liquid or the like in a bellows plate type heat exchanger.

[0015]

Means for Solving the Problems A heat exchanger for an absorption refrigerator according to the present invention is a corrugated plate formed by continuously bending a thin plate.
Bellows placed with the extending directions of the mountain-like peaks and valleys approximately vertical
Rate and the serpentine arranged substantially at the upper end of the bellows plate.
Put the first liquid (refrigerant liquid or solution) on one plate surface of the belly plate
A first distributor that flows down, and the other of the bellows plates
The second liquid (circulating water or cooling water)
Exchanger of an absorption refrigerator for exchanging heat between the liquid and the second liquid
In the shape corresponding to the corrugated plate shape of the bellows plate
The comb-shaped thin plate formed by cutting into the
The shape surface and the corrugated plate surface of the bellows plate are brought into close contact with each other,
And the longitudinal direction is the direction in which the peaks and valleys of the bellows plate extend.
Perpendicular to the bellows plate in the vertical middle position
A second distributor provided is disposed, and the second distributor is provided.
The edge along the longitudinal direction of the base is bent upward
And cut into a portion of the thin plate in contact with the bellows plate.
It is characterized in that a notch is formed. This
The first liquid flowing down the surface of the bellows plate is
It is intercepted by the thin plate of the two distributors and is temporarily stored on it.
The pooled first liquid is removed from the notch again
It flows down.

[0016]

Further, in the heat exchanger of the absorption refrigerator of the present invention, it is preferable that a plurality of second distributors are arranged at a vertically intermediate position on the bellows plate.

[0018]

In the heat exchanger of the absorption refrigerator according to the present invention, the means for circulating the cooling water or the like circulates the cooling water or the like in a heat exchange chamber formed using one surface of the bellows plate.

On the other hand, a refrigerant liquid or solution is supplied to the first distributor. After the refrigerant liquid or the like is once stored in the first distributor, it flows out to a substantially upper end position on the plate surface of the bellows plate. At this time, the refrigerant liquid or the like flows out to each heat transfer surface divided by each curved surface of the bellows plate.

The refrigerant liquid and the like flowing out to the respective heat transfer surfaces of the bellows plate 3 gradually evaporate while flowing down the surfaces of the respective heat transfer surfaces.

By the vaporization of the refrigerant liquid and the like, heat of the circulating water and the like on the opposite side of the bellows plate is taken away, and the temperature of the circulating water and the like decreases.

Here, the refrigerant liquid flowing down on each heat transfer surface divided by each curved surface of the bellows plate is:
Since the gas gradually evaporates while flowing down, a portion where the refrigerant liquid or the like does not flow is likely to be generated as it goes to the lower surface of the bellows plate.

In the process in which the refrigerant liquid or the like flows down the bellows plate, almost no refrigerant liquid or the like flows from one heat transfer surface to the other heat transfer surface. Cause.

However, in the heat exchanger of the absorption refrigerator,
The occurrence of a portion where the refrigerant liquid or the like does not flow due to the function of the second distributor is reduced.

That is, after leaving the first distributor, the refrigerant liquid or the like flowing down each heat transfer surface is once again stored by the second distributor. Then, the refrigerant liquid and the like stored in the second distributor flow down from the notch to each heat transfer surface at a substantially intermediate position in the vertical direction of the bellows plate.

Thus, the refrigerant liquid and the like flowing down each heat transfer surface are uniformly distributed again to each heat transfer surface by the second distributor, so that the heat transfer surfaces are uniformly distributed from the upper surface to the lower surface. And the like.

As a result, the heat exchanger of the absorption refrigerator can reduce the occurrence of drift of the refrigerant liquid and the like in the bellows plate, and can effectively utilize the entire heat transfer surface of the bellows plate. Since the heat transfer performance can be improved and the size of the bellows plate can be reduced, the absorption refrigerator can be made more compact.

[0028]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a heat exchanger of an absorption refrigerator according to an embodiment of the present invention. FIG. 2 is a perspective view showing a main part of the heat exchanger shown in FIG.

The heat exchanger of the present absorption refrigerator is a corrugated plate-shaped member formed by continuous bending of a thin plate, the bellows plate 3 of which the plate surface is disposed substantially vertically, and a bellows plate 3 above the bellows plate 3. And a means for circulating the circulating water 11 through a chamber formed by using one surface of the bellows plate 3 to flow the refrigerant liquid 6 to a substantially upper end position on the plate surface of the bellows plate 3. Have.

Here, the first distributor 1 includes a bellows plate 3
A function of flowing the refrigerant liquid 6 to the other surface, ie, a surface which is not in contact with the circulating water 11, for example, the notches 4a,
b, 4c.

Further, the heat exchanger of the absorption refrigerator has a second distributor 2 disposed at an intermediate position in the vertical direction on the bellows plate 3, as shown in FIGS.
Here, the vertical intermediate position in the bellows plate 3 is, as shown in FIGS. 1 and 2, excluding the vicinity of the upper end and the lower end in the direction of the peak or valley of the corrugated plate shape of the bellows plate 3. This is the position near the center.

The second distributor 2 has a function of temporarily storing the refrigerant liquid 6 flowing down the bellows plate 3 and flowing the collected refrigerant liquid 6 further downward in the bellows plate 3. .

The bellows plate 3 is provided in the second distributor 2.
Each heat transfer surface 3a, 3b, 3c divided by each curved surface in
Notches 5a, 5b,
5c are provided. Here, the refrigerant liquid 6 accumulated in the second distributor 2 is transferred from the notches 5 a, 5 b, 5 c to the respective heat transfer surfaces 3 a at a substantially intermediate position in the vertical direction of the bellows plate 3.
It flows down to 3b and 3c, respectively.

The second distributor 2 can be formed of, for example, a stainless steel thin plate.

On the other hand, the heat exchanger of the absorption refrigerator has at least one of a low-temperature regenerator, a condenser, an evaporator and an absorber in an absorption refrigerator having a structure as described below. Can be used as In this embodiment, a case will be described in which the heat exchanger of the absorption refrigerator is used as a heat exchanger in an evaporator.

The absorption refrigerator includes a high-temperature regenerator for heating the solution, a separator for separating the solution heated by the high-temperature regenerator into a refrigerant vapor and a primary concentrated solution, A low-temperature regenerator that is heated to make a concentrated solution, a condenser that liquefies the refrigerant vapor generated in the separator and the vapor generated in the low-temperature regenerator, and a refrigerant vapor that evaporates the refrigerant liquefied in the condenser. And an absorber for absorbing the refrigerant vapor generated in the evaporator into the concentrated solution flowing from the low-temperature regenerator, and means for guiding the dilute solution generated in the absorber to the high-temperature regenerator. It is a typical absorption refrigerator.

FIG. 3 is a view showing a second example of the heat exchanger shown in FIG.
It is the top view (a) and side view (b) which show an example of a distributor. As shown in the figure, the second distributor 2 is formed by bending a thin plate into an L-shape, and further cutting the thin plate into a plurality of shapes corresponding to peaks or valleys in the corrugated plate shape of the bellows plate 3, respectively, so-called comb shape. You are. In other words, the second distribution
The container 2 is formed by cutting the edge along the longitudinal direction of the comb-shaped base of the thin plate.
It is formed by bending upward.

[0039] Then, as shown in FIGS. 1 and 2, with respect to peaks or troughs in the direction of the mountain in the corrugated shape of the bellows plate 3, the longitudinal direction of the second distributor 2 is Ryakujika exchange, and, The corrugated plate surface of the bellows plate 3 and the comb-shaped surface of the second distributor 2 are brought into close contact with each other to form a vessel for temporarily storing the refrigerant liquid 6.
that's all

Further, the second distributor 2 is provided with a plurality of notches 5a, 5b, 5c as shown in FIGS. Since the plurality of notches 5a, 5b, and 5c are not in close contact with the corrugated plate surface of the bellows plate 3, respectively, the coolant liquid 6
Flows out to the corrugated surface of the bellows plate 3 below.

Next, the operation of the heat exchanger of the absorption refrigerator will be described. First, the circulating water 11 is circulated through a chamber formed by one surface of the bellows plate 3 and the body case of the heat exchanger 10 and the like.

On the other hand, the first distributor 1 is supplied with the refrigerant liquid 6. After being temporarily stored in the first distributor 1, the refrigerant liquid 6 flows out to a substantially upper end position A on the plate surface of the bellows plate 3. At this time, the refrigerant liquid 6 is divided into the heat transfer surfaces 3a, 3b,
3c.

Each heat transfer surface 3a, 3 in the bellows plate 3
The refrigerant liquid 6 flowing out to b and 3c evaporates gradually while flowing down the surfaces of the heat transfer surfaces 3a, 3b and 3c.

By the vaporization of the refrigerant liquid 6, the heat of the circulating water 11 on the opposite side of the bellows plate 3 is taken away, and the temperature of the circulating water decreases.

Here, the refrigerant liquid 6 flowing down on each of the heat transfer surfaces 3a, 3b, 3c divided by each curved surface of the bellows plate 3 gradually evaporates while flowing down, as shown in FIG. The lower the lower surface of the bellows plate 3, the more likely the portion 3x into which the refrigerant liquid 6 does not flow.

In the process in which the refrigerant liquid 6 flows down the bellows plate 3, the refrigerant liquid 6 hardly flows from one heat transfer surface to another heat transfer surface, and the portion 3x where the refrigerant liquid 6 does not flow is formed. Cause.

However, in the heat exchanger of the absorption refrigerator,
The operation of the second distributor 2 reduces the generation of the portion 3x into which the refrigerant liquid 6 does not flow.

That is, after leaving the first distributor 1, the refrigerant liquid 6 flowing down on each of the heat transfer surfaces 3 a, 3 b, 3 c is
It is once again stored by the distributor 2. Then, the refrigerant liquid 6 accumulated in the second distributor 2 flows down from the notches 5 a, 5 b, 5 c to the heat transfer surfaces 3 a, 3 b, 3 c at a substantially middle position in the vertical direction of the bellows plate 3.

As a result, the refrigerant liquid 6 flowing down the heat transfer surfaces 3a, 3b, 3c is again uniformly distributed to the heat transfer surfaces 3a, 3b, 3c by the second distributor 2. The refrigerant liquid 6 flows uniformly from the upper surface to the lower surface of the heat transfer surface.

Thus, the heat exchanger of the absorption refrigerator can reduce the occurrence of the drift of the refrigerant liquid in the bellows plate 3 and can effectively use the entire heat transfer surface of the bellows plate 3. Since the heat transfer performance can be improved and the size of the bellows plate 3 can be reduced, the absorption refrigerator can be made more compact.

In the heat exchanger of the absorption refrigerator according to the present embodiment, one second distributor 2 is disposed at an intermediate position in the vertical direction on the bellows plate 3, but the present invention is not limited to this. Instead, for example, a plurality of second distributors 2 may be provided at an intermediate position in the vertical direction on the bellows plate 3.

[0052]

As described above, according to the present invention, since the second distributor is provided on the bellows plate, it is possible to reduce the occurrence of uneven flow of the refrigerant liquid in the bellows plate, and to reduce the heat transfer performance of the bellows plate. And a heat exchanger of an absorption refrigerator having high heat exchange performance can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a heat exchanger of an absorption refrigerator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a main part of the heat exchanger shown in FIG.

FIG. 3 is a plan view (a) and a side view (b) showing an example of a second distributor in the heat exchanger shown in FIG.

FIG. 4 is an explanatory view showing a cell and coil system in a heat exchanger of a conventional absorption refrigerator.

FIG. 5 is an explanatory view showing a cell-and-tube system in a heat exchanger of a conventional absorption refrigerator.

FIG. 6 is an explanatory view showing a bellows plate system in a heat exchanger of a conventional absorption refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st distributor 2 2nd distributor 3 Bellows plate 3a, 3b, 3c Heat transfer surface 4a, 4b, 4c Notch 5a, 5b Notch 6 Refrigerant liquid 7 Dripper 8 Coiled pipe 9 Tube 10 Heat exchanger 11 Circulation water

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Onishi 1370 Koyasu-cho, Hamamatsu-shi, Shizuoka Prefecture Inside Yazaki Corporation (56) References JP-A-6-147696 (JP, A) JP-A-4-30964 (JP) , A) Fully open 1987-77766 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25B 37/00 F25B 33/00 F25B 39/02 F25B 39/04

Claims (2)

(57) [Claims] 1. A corrugated plate formed by continuously bending a thin plate
Bellows placed with the extending directions of the mountain-like peaks and valleys approximately vertical
Rate and the serpentine arranged substantially at the upper end of the bellows plate.
A first distributor for flowing a first liquid onto one plate surface of a belly plate
And the second liquid is applied to the other plate surface side of the bellows plate.
Absorption refrigeration for flowing heat and exchanging heat between the first and second liquids
In the heat exchanger of the machine, the corrugated plate
Comb-shaped thin plate cut into the corresponding shape
With the comb-shaped surface of the thin plate and the corrugated plate surface of the bellows plate
And the longitudinal direction with the peak of the bellows plate
Perpendicular to the direction in which the valley extends, perpendicular to the bellows plate
The second distributor provided at the intermediate position in the direction
The edge along the longitudinal direction of the comb-shaped base of the thin plate
The bellows plate of the thin plate bent upwards
A heat exchanger for an absorption refrigerator, wherein a notch is formed in a portion in contact with the heat exchanger. 2. The heat exchanger for an absorption refrigerator according to claim 1, wherein the second distributor is provided in a direction perpendicular to the bellows plate.
A heat exchanger for an absorption refrigerator, wherein a plurality of heat exchangers are arranged.