JP2004116822A - Solution spraying structure of multiplate type heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solution spraying structure of a multiplate type heat exchanger for uniformly spraying a solution, and improving heat exchange efficiency while restraining cost. <P>SOLUTION: In this multiplate type heat exchanger, elements 4 formed by mutually superposing two plate-like bodies 5 and 6 of applying recess-projection work to both surfaces, are superposed in a plurality between a pair of rectangular side plates 2 and 3, and an element inside space 7 inside of the respective elements 4 is formed as a passage for passing one of a heat transfer medium, and an element outside space 8 between the respective elements is formed as a passage for passing the other solution medium. Upper end recessed parts 4a are formed by upwardly extending both ends of an upper end horizontal part having a maximum width of the respective elements 4, and the upper end recessed parts 4a of the respective elements 4 are mutually watertightly joined, and an upper part of the rectangular side plates 2 and 3 and the upper end recessed parts 4a of the outermost side both elements 4 are watertightly joined. An upward opening solution medium storage tank 12 is formed of the respective upper end recessed parts 4a and the upper part of a pair of side plates 2 and 3, and communicating holes 13 and 14 for communicating with the element outside space 8 from the storage tank 12 are arranged in a plurality of rows in the plate-like bodies 5 and 6 for forming the upper end recessed parts 4a. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a multi-plate heat exchanger, and more particularly, to a structure for spraying a solution medium.
[0002]
[Prior art]
As a structure for dispersing a solution medium in a conventional multi-plate heat exchanger, there is an example filed by the same applicant earlier (see Patent Document 1).
[0003]
[Patent Document 1]
JP-A-10-206063 (
[0018]
[0029]
[0034]
(FIGS. 7 and 9)
[0004]
In one embodiment of Patent Document 1, the upper ends of two plate-like members forming an element form an open groove-shaped medium passage, and communication holes are provided at equal intervals in the plate-like body of the medium passage. Each nozzle faces a medium supply pipe arranged above each of the medium passages of each element.
[0005]
The solution medium dropping from each nozzle through the medium supply pipe falls into each medium passage, flows through the medium passage, flows out of the communication port into the outside space of the element, and exchanges heat with the medium in the inside space of the element.
[0006]
In another embodiment of Patent Document 1, a medium passage having a closed cross section is formed instead of a groove having an open upper end of two plate-like members forming the element, and a communication port is formed in the medium passage. It is lined up.
[0007]
The solution medium supplied to the medium passage having the closed cross section flows out of the communication port into the external space of the element and exchanges heat with the medium in the internal space of the element.
[0008]
[Problems to be solved by the invention]
In the case of the former embodiment of Patent Document 1, it is necessary to provide a nozzle positioned with high dimensional accuracy corresponding to each medium passage, which increases the cost, and the space outside the element from the communication port in the process of flowing the solution medium through the medium passage. Therefore, the amount of the solution medium flowing out of the communication port differs between the upstream side and the downstream side of the medium passage, and it is difficult to uniformly spray the solution.
[0009]
In the latter embodiment of Patent Document 1, in order to spray a uniform and appropriate amount of the solution from the communication ports arranged in the medium passage having a closed cross section, the pressure of the solution supplied to the medium passage is always kept constant. This must be maintained, and equipment for that purpose is required, resulting in high costs.
[0010]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a solution spraying structure of a multi-plate heat exchanger that enables uniform solution spraying while suppressing costs and improves heat exchange efficiency.
[0011]
Means for Solving the Problems and Functions and Effects
In order to achieve the above object, the invention according to claim 1 includes a plurality of elements each formed by laminating two plate-like bodies having irregularities on both surfaces thereof between a pair of rectangular side plates, In the multi-plate heat exchanger, the internal space inside each element is a passage for passing one of the heat transfer media, and the external space between the elements is a passage for passing the other solution medium. Both ends of the upper end horizontal portion having the maximum width of each element are extended upward to form an upper end recess, and the upper end recesses of the respective elements are joined to each other in a watertight manner, and both the upper part of the rectangular side plate and the outermost elements The upper concave portion is joined in a watertight manner, and a storage tank for the solution medium which is opened upward by the upper portions of the upper concave portions and the pair of side plates is formed, and the plate-like body forming the upper concave portion is formed from the storage tank. Multiple communication holes communicating with the space outside the element It was arrayed by solution sprayed structure of the multi-plate type heat exchanger.
[0012]
When the solution medium is stored in the storage tank formed by each upper concave part and the upper part of the pair of side plates, a uniform and appropriate amount of the solution medium can be easily discharged from each communication hole into the outer space of the element, thereby improving the heat exchange efficiency. Can be done.
[0013]
A storage tank is formed by each element and a pair of side plates, and a means for supplying a solution to the storage tank may have a simple structure without requiring a special pipe or the like requiring dimensional accuracy, and cost reduction may be achieved. it can.
[0014]
According to a second aspect of the present invention, in the solution spraying structure of the multi-plate heat exchanger according to the first aspect, the upper end recess of each element forms a groove shape in which ends of a pair of plate-like bodies are open to each other, The communication holes are provided in a plurality of rows at a portion of the pair of plate-like bodies forming a groove.
[0015]
The solution medium stored in the storage tank can uniformly flow out to the space outside the element through the plurality of groove-shaped communication holes forming the bottom of the storage tank, and the heat exchange efficiency can be improved.
[0016]
A plurality of grooves formed in the upper concave portion of each element are joined to form a storage tank, and it is not necessary to supply a solution medium to each groove, and it is sufficient to supply the solution medium to the storage tank formed as a whole. The supply means is simple and the cost can be reduced.
[0017]
According to a third aspect of the present invention, in the solution spraying structure of the multi-plate type heat exchanger according to the first aspect, the upper end recesses of the respective elements bulge in the direction in which the ends of the pair of plate-like bodies are separated from each other. A closed cross-sectional shape that forms a communication space is formed, and the communication hole has a plurality of rows of upper communication holes that communicate the communication space of the plate-shaped body that forms the communication space with an upper storage portion and the lower outside of the element. It is characterized by comprising a plurality of rows of lower communication holes communicating with the space.
[0018]
The solution medium stored in the storage tank flows into the communication space of the upper end recess of each element through the upper communication holes arranged in a plurality of rows in the upper end recess forming the bottom of the storage tank, and further from the communication space, a plurality of lower sides. As a result, the solution flows out to the space outside the element via the communication hole, so that the solution medium can uniformly flow out to the space outside the element without being affected by a change in the storage amount of the solution medium, and the heat exchange efficiency can be kept high.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment according to the present invention will be described below with reference to FIGS.
The heat exchanger according to the present embodiment is applied to an evaporator 1 of an absorption refrigerator, and a perspective view of the evaporator 1 is shown in FIG.
[0020]
A plurality of substantially vertically rectangular elements 4 are sandwiched between a pair of vertically rectangular side plates 2 and 3 in a state of being sequentially superposed.
Each element 4 is configured by laminating a pair of plate-like bodies 5 and 6, and the plate-like bodies 5 and 6 are formed with irregularities on both surfaces by press working (see FIGS. 2 and 3).
[0021]
The plate-like bodies 5 and 6 are superimposed on each other, and their peripheral edges are joined in a water-tight manner by brazing, and as shown in the longitudinal sectional view of FIG. An in-element space 7 is formed where they come into contact with each other when they approach each other and are separated from each other.
[0022]
An extra-element space 8 is naturally formed between each element 4 and between the element 4 and the plate-like bodies 5 and 6.
[0023]
Each element 4 has a U-shaped upper concave portion 4a formed by extending both ends of an upper horizontal portion upward and opening upward. The upper concave portion 4a of the present embodiment is formed by a pair of plate-shaped members 5, 6. Have a closed cross-sectional shape which bulges in the direction away from each other and forms a communication space 9 inside (see FIG. 3).
[0024]
The upper concave portion 4a having the communication space 9 has the maximum width of the element 4, and the upper concave portions 4a come into contact with each other when the elements 4 are sequentially overlapped, and are joined to each other in a watertight manner by brazing.
[0025]
Circular holes are respectively formed at upper and lower portions of the pair of plate-like bodies 5 and 6 so as to face each other, and the circular holes of each element 4 are connected to form common communication passages 10 and 11. Reference numeral 11 communicates with each element space 7.
[0026]
The side plates 2 and 3 are respectively applied to both sides of the element 4 thus superimposed, and circular holes formed on the upper and lower sides of the side plates 2 and 3 are connected to the communication paths 10 and 11, and the vertically long side plates 2 and 3 are connected. And the upper end recesses 4a of the outermost elements 4 and 4 are joined in a watertight manner by brazing.
[0027]
That is, the storage tank 12 is opened upward so that the upper portions of the side plates 2 and 3 close the upper and lower sides of the U-shaped groove which is formed by superimposing the upper end recesses 4a of the plurality of elements 4 sequentially. Is formed.
[0028]
A plurality of circular upper communication holes 13 for communicating the upper storage tank 12 and the communication space 9 are provided in a plurality of rows at portions of the upper concave portions 4a of the plate-like bodies 5 and 6 forming the communication space 9, and the communication space is formed. Plural rows of circular lower communication holes 14 communicating the element 9 and the lower extra-element space 8 are provided.
[0029]
Therefore, the storage tank 12 communicates with the extra-element space 8 via the communication space 9 through the upper communication hole 13 and the lower communication hole 14.
The communication holes 13 and 14 may be oblong holes that are horizontally long.
[0030]
As shown in FIG. 1, a refrigerant is supplied to the storage tank 12 of the present evaporator 1 configured as described above through a simple supply pipe 15 and stored in the storage tank 12.
On the other hand, water flows into the lower communication path 11 and flows out of the upper communication path 10 around the in-element space 7 of each element 4.
In some cases, conversely, the fluid may flow from the upper communication path 10 and flow out of the lower communication path 11.
[0031]
The refrigerant stored in the storage tank 12 flows into the communication space 9 of each upper end recess 4a through the upper communication holes 13 provided in a plurality of rows in the upper end recess 4a of each element 4 constituting the bottom portion, and further flows into each communication space. From 9 through a plurality of lower communication holes 14, it is discharged and dispersed into the element outer space 8.
[0032]
The refrigerant is once stored in the storage tank 12 and the communication space 9, and is evenly sprayed from the lower communication holes 14, which are uniformly arranged at the same height, with equal pressure to the outer space 8. .
[0033]
In particular, the more the number of the lower communication holes 14 is better for the uniform spraying of the refrigerant, the more the number of the lower communication holes 14 is. There is a limit.
[0034]
In the case of the present evaporator 1, the depth to the lower communication hole 14 of the refrigerant stored in the storage tank 12 including the communication space 9 is h (m), and the flow velocity of the refrigerant flowing out from the lower communication hole 14 is v (m). / S) and the gravitational acceleration is g (m / s ² ),
h = C1 · (v ² / 2g) ▲ 1
Where C1 is a loss coefficient relating to flow resistance and is a value larger than 1.0.
[0035]
Assuming that the amount of refrigerant supplied by the supply pipe 15 is Q (m ³ / s), the cross-sectional area of one of the lower communication holes 14 is A (m ² ), and the number of the lower communication holes 14 is x.
Q = v · A · x ……… ▲ 2 ▼
From the equation (2) and the equation (1), x = Q / (A · (2 · g · h / C1) ^1/2 ) (3)
Is led.
However, since A is clogged by a precipitate or the like, it is necessary to set the minimum diameter to 1.0 to 0.5 mm.
[0036]
As can be seen from equation (3), if the loss coefficient C1 is increased, the number x of the lower communication holes 14 can be increased within the limit of the minimum diameter, and the evaporator 1 is located at the bottom of the storage tank 12. Has an upper communication hole 13, and the presence of the upper communication hole 13 increases the flow resistance and increases the loss coefficient C1.
[0037]
Therefore, as the loss coefficient C1 is larger, the number x of the lower communication holes 14 can be increased, and the number of the lower communication holes 14 is evenly and uniformly distributed from the large number of lower communication holes 14 to the external space 8.
Even if the coolant supply amount Q is slightly reduced, if the depth h to the lower communication hole 14 of the coolant is ensured to some extent, the coolant is evenly dispersed, and the coolant supply amount Q is not significantly affected by the fluctuation.
[0038]
In this way, the refrigerant uniformly dispersed in the element outer space 8 evaporates, and the water flowing around the element inner space 7 can be cooled by the latent heat of the evaporation without causing a local deviation, and heat can be efficiently exchanged. It is discharged from the communication passage 10 as cold water.
[0039]
The storage tank 12 of the present evaporator 1 is formed by the upper end recess 4a of each element 4 and the side plates 2 and 3, and does not require any special member, so that the cost can be reduced.
[0040]
In addition, the means for supplying the solution to the storage tank does not require a special pipe requiring dimensional accuracy, and a simple supply pipe 15 can be used, so that the cost can be reduced.
[0041]
Furthermore, the flow rate of the refrigerant sprayed from the lower communication hole 14 to the external space 8 can be freely adjusted by the number and size of the lower communication holes 14.
[0042]
Next, an evaporator 31 according to another embodiment will be described with reference to FIG.
The evaporator 31 basically has the same structure as the evaporator 1 and is composed of side plates 32 and 33 having substantially the same shape, and a plurality of stacked elements 34 sandwiched therebetween. A pair of plate-like bodies 35 and 36 are overlapped to form a space 37 inside the element and a space 38 outside the element.
[0043]
Only the upper end recess 34a of the element 34 is different from that of the evaporator 1.
That is, the upper end recess 34a forms a groove 39 in which the ends of the pair of plate-like bodies 35 and 36 are open to each other.
[0044]
The upper concave portion 34a in which the groove 39 is formed is joined in a water-tight manner by brazing sequentially, and forms a storage tank 42 together with the pair of side plates 32 and 33.
A plurality of communication holes 43 are arranged in a row at portions of the pair of plate-like bodies 35 and 36 where the groove 39 is formed.
[0045]
The refrigerant stored in the storage tank 42 flows out uniformly into the external space 38 through a plurality of communication holes 43 uniformly and uniformly arranged at the same height of each groove 39 forming the bottom of the storage tank 42. Thus, the water flowing around the element inner space 37 can be cooled by the latent heat of the evaporation of the refrigerant uniformly dispersed in the element outer space 38 without causing local deviation, and heat exchange can be performed efficiently.
[0046]
The groove 39 of the upper concave portion 34a of each element 34 is more simplified, and the manufacturing cost can be reduced.
[0047]
In the above embodiment, the present invention is applied to the evaporator. However, the present invention can be applied to an absorber other than the evaporator or a heat exchanger involving spraying of a solution medium.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of an evaporator according to one embodiment of the present invention.
FIG. 2 is an upper front view of the evaporator without a side plate.
FIG. 3 is a sectional view taken along line III-III in FIG. 2;
FIG. 4 is a sectional view of an evaporator according to another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Evaporator, 2, 3 ... Side plate, 4 ... Element, 4a ... Upper end recessed part, 5, 6 ... Plate-shaped body, 7 ... Element inside space, 8 ... Element outside space, 9 ... Communication space, 10, 11 ... Connection Passage, 12: storage tank, 13: upper communication hole, 14: lower communication hole, 15: supply pipe, 31: evaporator, 32, 33: side plate, 34: element, 34a: upper end recess, 35, 36: plate Reference numeral, 37: element internal space, 38: element external space, 39: groove shape, 42: storage tank, 43: communication hole.

Claims (3)

A plurality of elements formed by laminating two plate-like bodies having irregularities on both sides are laminated between a pair of rectangular side plates, and one of the heat transfer media passes through a space inside the element inside each element. In the multi-plate heat exchanger as a passage for passing the outside solution space between each device as a passage for passing the other solution medium,
Both ends of the upper end horizontal portion having the maximum width of each element are extended upward to form an upper end recess,
The upper end concave portions of the respective elements are joined to each other in a watertight manner,
The upper portion of the rectangular side plate and the upper end recesses of the outermost elements are joined in a watertight manner,
A storage tank for a solution medium that is opened upward by the upper end recesses and the upper portions of the pair of side plates is formed,
A solution spraying structure for a multi-plate heat exchanger, wherein a plurality of rows of communication holes communicating from the storage tank to the outside space of the element are provided in a plate-like body forming the upper end recess. The upper end recess of each of the elements forms a groove shape in which the ends of the pair of plate-like bodies are open to each other,
The solution spray structure for a multi-plate heat exchanger according to claim 1, wherein the communication holes are provided in a plurality of rows at a portion of the pair of plate-like bodies that form the groove. The upper end concave portion of each of the elements has a closed cross-sectional shape in which the ends of the pair of plate-like bodies bulge away from each other to form a communication space inside,
The communication holes are formed of a plurality of upper communication holes that communicate the communication space of the plate-shaped body that forms the communication space with the upper storage portion and a plurality of lower communication holes that communicate with the lower outer space of the element. The solution spraying structure for a multi-plate heat exchanger according to claim 1, comprising a communication hole.

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