JPH0829077A - Laminated plate type heat exchanger - Google Patents

Abstract

PURPOSE:To prevent the thermal stress from occurrence by a method wherein a manifold mounted on one side of a laminated body in the laminating direction is attached to a pressure vessel and a manifold mounted on the other side is connected to the pressure vessel via bellows and elastic members. CONSTITUTION:A manifold 4b that is opposite to a manifold 4a is attached to the upper end of a laminated body 1 and connected to a header 20, which is welded to a pressure vessel 5, via metallic bellows 21 and coil springs 22 as elastic members. Two fluid flow paths 23 and 24 are isolated from each other by the metallic bellows 21 that expand and contract in the laminating direction together with the coil springs 22, so that high-temperature fluid H and low-temperature fluid L are prevented from mixing cup. Event when a difference in thermal shrinkage arises between the pressure vessel 5 and the laminated body 1 because temperature drops and the lengths in the laminating direction change, a thermal stress does not occurs on the laminate body 1 as the difference is absorbed by the expansion or contraction of the bellows 21 and the coil springs 22. Therefore, bonded parts between perforated heat transfer plates and heat-insulating plates do not come apart, so that helium gas can be prevented from leaking.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to helium liquefaction /
The present invention relates to a laminated plate heat exchanger applied to cryogenic equipment such as refrigeration equipment.

[0002]

2. Description of the Related Art FIG. 2 shows an example of a conventional laminated plate heat exchanger.

In the figure, 1 is a laminated body in which a porous heat transfer plate 12 as a heat transfer plate, which will be described later, and a heat insulating plate 11 are alternately bonded via an adhesive sheet 13, and 2 is a high temperature fluid provided in the laminated body 1. 7 is a high-temperature channel for passing through 7, 3 is a low-temperature channel for passing a low-temperature fluid 8 provided in the laminated body 1, 4 is joined to both ends of the laminated body 1 in the laminating direction, A header for distributing the high-temperature fluid H and the low-temperature fluid L to the flow path 3, respectively. From the inlet 7 and the outlet 8 provided in the header 4, the high-temperature fluid H and the low-temperature fluid H are supplied as indicated by arrows in the figure. The fluid L flows into and out of the high temperature passage 2 and the low temperature passage 3 of the laminated body 1, respectively. 5 is a laminated body 1 and a header 4
Is a pressure vessel made of stainless steel or the like for accommodating and holding the inner surface of the header 4 and the inner surface of the pressure vessel. Reference numeral 6 denotes a mandrel for aligning the porous heat transfer plate 12 and the heat insulating plate 11 when the laminated body 1 is assembled.

FIG. 3 shows the structure of the laminated body 1 shown in FIG. Reference numeral 11 is a heat insulating plate in which a high temperature flow path 2 and a low temperature flow path 3 are respectively formed, and normally, high heat insulating FRP (fiber reinforced plastic) or the like is used. Reference numeral 12 denotes a porous heat transfer plate as a heat transfer plate having a large number of minute holes formed therein, and is made of aluminum or the like having a good heat transfer property. The heat insulating plate 11 and the porous heat transfer plate 12 are alternately bonded via the plastic adhesive sheet 13.

The high temperature fluid H and the low temperature fluid L exchange heat through the porous heat transfer plate 12 when passing through the high temperature channel 2 and the low temperature channel 3, respectively. Further, the heat transfer in the stacking direction is blocked by the function of the heat insulating plates 11 alternately stacked with the porous heat transfer plates 12.

However, in the laminated plate heat exchanger thus constructed, the thermal expansion coefficients of the pressure vessel 5 and the laminated body 1 are generally different, so that a large thermal stress is generated in the laminated body 1 when cooled. However, there is a problem that the bonded portion of the laminated body 1 is peeled off, and gas leakage of high-pressure helium gas or the like flowing in the high-temperature flow path 2 may occur.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the conventional laminated plate heat exchanger, so that even if there is a great difference in the coefficient of thermal expansion between the pressure vessel and the laminated body, the laminated body It is an object of the present invention to provide a laminated plate type heat exchanger in which peeling of a laminated body does not occur and a gas leak due to the peeling does not occur without generating a large stress.

[0008]

Therefore, the laminated plate heat exchanger of the present invention has the following means. (1) A manifold joined to one side of the laminated body in the laminating direction is fixed to the pressure vessel by welding or the like, and a manifold joined to the other side of the laminated body in the laminating direction is pressure vessel via a bellows and an elastic material. Joined to.

Another laminated plate heat exchanger of the present invention is
In addition to the means of (1) above, the following means were adopted. (2) A fluid passage is formed between the manifold and the pressure vessel by the bellows interposed between the manifold joined to the other side of the laminated body in the laminating direction and the pressure vessel, and the fluid passage is formed in the laminating direction of the laminated body. Separate the flowing fluids from each other,
A passage was made between the manifold and the pressure vessel.

[0010]

The laminated plate type heat exchanger of the present invention has the above-mentioned means (1). (1) The difference in heat shrinkage between the pressure vessel and the laminated body in the laminating direction is the difference between the manifold on the other side of the laminated body and the pressure vessel. Since it is absorbed by the contraction of the bellows installed between and the coil spring,
Thermal stress is not applied to the laminated body, and leakage of gas due to peeling of the adhesive portion of the laminated body can be prevented.

Another laminated plate heat exchanger of the present invention is
By means of the above (2), in addition to the above (1), (2) the manifold on the other side of the laminated body, which is provided to absorb thermal contraction and whose distance from the pressure vessel varies, and the pressure vessel are provided. The formation of the fluid passage is facilitated, the mixing of the high temperature fluid and the low temperature fluid in this portion can be completely prevented, and the leakage of gas can be surely prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a laminated plate heat exchanger of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the laminated plate heat exchanger of the present invention. The laminated body 1, the pressure vessel 5 and the like shown in FIGS. 2 and 3 in the present embodiment and those having the same reference numerals are the same as those in the conventional example, unless otherwise required for the description of the present embodiment. , Description is omitted. Further, 4a is the same as the manifold 4 shown in the conventional example, and is joined to the lower end of the laminated body 1 and the side portion thereof is provided with the pressure vessel 5
It is fixed by means such as welding.

Reference numeral 4b is a manifold joined to the upper end of the laminated body 1 on the side opposite to the manifold 4a, and is connected via a header 20 welded to the pressure vessel 5 to a bellows 21 and a coil spring 22 as an elastic material. There is. When connecting the manifold 4b and the header 20, the coil spring 22 is interposed between the lower end surface of the header 20 and the upper end surface of the manifold 4b in a compressed state. Therefore, the laminated body 1 is constantly pressed in the laminating direction by the reaction force of the coil spring 22, and even if the entire heat exchanger vibrates due to some external force, the laminated body 1 receives a harmful force such that the adhesion of the laminated body 1 is peeled off. There is no.

Further, 23 is a high temperature fluid flow passage space formed between the header 20 and the manifold 4b for flowing the high temperature fluid H from the inflow port 7 to the high temperature flow passage 2 of the laminate 1, and 24 is similarly laminated. The low temperature fluid from the low temperature flow path 3 of the body 1 is attached to the header 2
It is a low temperature fluid flow path space formed between the header 20 and the manifold 4b for flowing to the discharge port 8 provided at 0.

These two fluid flow passage spaces 23, 24 are
Two fluid passage spaces 2 are separated from each other by a metal bellows 21 that expands and contracts in the stacking direction together with a coil spring 22.
Mixing of the high-temperature fluid H and the low-temperature fluid L flowing through 3, 24 is prevented.

Since the laminated plate heat exchanger of this embodiment is constructed as described above, it is used in a helium liquefaction / refrigeration system or the like, the temperature is lowered, and the length in each laminating direction is changed. Even if a difference in thermal contraction occurs between the pressure container 5 and the laminated body 1, this difference is absorbed by contraction or extension of the bellows 21 and the coil spring 22, so that no thermal stress is generated in the laminated body 1. Therefore, the porous heat transfer plate 12 of the laminated body 1
The adhesive portion of the heat insulating plate 11 will not be peeled off, and helium gas or the like flowing in the high temperature flow path 2 can be prevented from flowing out of the container.

Further, even if the gap between the header 20 fixed to the pressure vessel 5 and the manifold 4b joined to the laminated body 1 varies due to the difference in heat shrinkage between the pressure vessel 5 and the laminated body 1, the high temperature fluid Fluid flow space 23 in which H flows and low temperature fluid L
Since the fluid passage space 24 in which the fluid flows is completely isolated by the bellows 21, the two fluids are not mixed with each other, and further gas leakage can be completely prevented.

In the above embodiment, the case where two kinds of fluids are supplied to the laminated plate heat exchanger is shown, but the present invention is not limited to such an embodiment, and three kinds or more. It can also be applied to a laminated plate heat exchanger in which the above fluid is flowed.

Also, an example of the coil spring as the elastic material is shown, but this is also one which can absorb the variation in the gap between the header 20 and the manifold 4b and can always apply the load in the stacking direction of the stack. Other elastic materials may be used.

[0021]

As described above, according to the laminated plate type heat exchanger of the present invention, due to the constitution described in claim 1, (1) the laminated body which has been a problem in the conventional heat exchanger. Since it is possible to prevent the generation of thermal stress due to the difference in heat shrinkage of the pressure vessel, it is possible to provide a highly efficient heat exchanger without gas leakage due to peeling of the laminate.

Further, according to the laminated plate type heat exchanger of the present invention, according to the constitution described in claim 2, (2) the heat shrinkage ratio of the laminated body and that of the pressure vessel are varied,
Facilitates the formation of fluid passages between the stack and the pressure vessel,
Further, it is possible to prevent mixing of a plurality of fluids flowing through the passages in the laminated body at this portion and also to prevent gas leakage.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a laminated plate heat exchanger of the present invention,

FIG. 2 is a sectional view showing a conventional laminated plate heat exchanger,

FIG. 3 is a perspective view showing a structure of a laminated body of a laminated plate heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 High temperature channel 3 Low temperature channel 4 Header 4a Manifold on one side in the stacking direction 4b Manifold on the other side in the stacking direction 5 Pressure vessel 6 Mandrel 7 Inflow port 8 Discharge port 11 Insulation plate 12 Porous heat transfer as heat transfer plate Plate 13 Adhesive Sheet 20 Header 21 Bellows 22 Coil Spring as Elastic Material 23 High Temperature Fluid Flow Path Space 24 Low Temperature Fluid Flow Path Space

Claims (2)

[Claims] 1. A fluid body flowing through the fluid passage, wherein a laminated body in which a plurality of heat transfer plates and heat insulating plates are alternately laminated is accommodated in a pressure vessel, and a plurality of fluid passages are formed in a laminating direction of the laminated body. In a laminated plate heat exchanger for exchanging heat between the laminated body, a manifold joined to one side of the laminated body in the laminating direction is fixed to the pressure vessel, and a manifold joined to the other side of the laminated body is interposed with a bellows and an elastic material. A laminated plate heat exchanger characterized by being mounted and joined to the pressure vessel. 2. The laminated plate heat exchanger according to claim 1, wherein at least one of the fluid passages of a plurality of systems is separated from the other fluid passages by the bellows.