JPH05701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heat exchanger that can be suitably used in a He liquefier or the like.

[Prior Art] In equipment that uses deep cooling, such as a He liquefier using a Claude cycle, the heat exchanger occupies a large proportion of the equipment volume. Therefore, there was a problem that the entire device could not be made compact unless the heat exchanger was made smaller. However, simply reducing the size of the heat exchanger causes the disadvantage that heat exchange efficiency decreases and heat intrusion from the normal temperature range to the low temperature range increases. Therefore, it has not been easy to make this type of device more compact.

By the way, in recent years, as shown in Fig. 7, a heat insulating spacer c in the form of a frame having a transparent window a for a high-pressure path and a transparent window b for a low-pressure path, and a copper plate having a large number of ventilation holes d have been developed. A so-called stacked heat exchanger of a type in which exchange elements e are alternately stacked in the flow direction has been prototyped for practical use, and these problems are being solved.

[Problems to be solved by the invention] However, the above-mentioned vertically laminated heat exchanger requires a large number of heat exchange elements e having a large number of ventilation holes d to be stacked on top of each other, which requires processing and processing. It takes time to assemble.

Moreover, since the bonding surfaces between each heat exchange element e and each heat insulating spacer c are distributed in the thickness direction, when using epoxy resin prepreg etc. for bonding, it is difficult to control the bonding pressure and temperature. be.

Furthermore, in the case shown in the figure, the flow path rapidly narrows along the flow direction at the heat exchange element e and rapidly widens at the heat insulating spacer c, which is a repeated change, so the flow path resistance increases significantly and the heat exchange There is also the disadvantage that energy loss within the vessel is large, resulting in the generation of a non-negligible amount of heat.

In order to eliminate this inconvenience, the present inventor installed a heat insulating wall between the pair of outer panels, which is made by laminating heat insulating sheets made of epoxy resin prepreg in a direction perpendicular to the flow and gluing them together. A fluid passage is formed between each of these heat insulating walls, and a plurality of heat exchange plates that cross each of these fluid passages are intermittently arranged between the heat insulating sheets, and the heat exchange plate We have devised a horizontally laminated heat exchanger, which was still novel at the time of filing of the present invention and is a thin plate-shaped heat exchanger whose directional dimension is larger than its thickness dimension.

However, with such a configuration, the fluid flows approximately parallel to the heat exchange surfaces on both sides of the heat exchange plate, so depending on the flow velocity, a laminar flow boundary may occur near the heat exchange surfaces. Layers may develop. As a result, heat exchange between the successively flowing new fluid and the heat exchange plate is not performed sufficiently, resulting in a problem that heat exchange efficiency is reduced. Such inconvenience can be solved by reducing the width dimension of each heat exchange plate in the fluid flow direction, but in this case, it becomes necessary to increase the number of heat exchange plates. A problem arises in that assembly becomes troublesome.

The present invention aims to solve the above-mentioned problems all at once with a simple configuration.

[Means for Solving the Problems] In order to achieve the above object, the present invention has a heat insulating wall made by laminating and bonding heat insulating sheets made of epoxy resin prepreg in a direction perpendicular to the flow. A plurality of independent fluid passages are formed between each heat insulating wall, and a plurality of heat exchange plates are intermittently arranged between the heat insulating sheets to cross each of these fluid passages, and the heat exchange plates are , assuming a new horizontally laminated type heat exchanger, which is a thin plate-like material whose dimension in the flow direction is larger than its thickness,
The present invention is characterized in that flow disturbance elements for preventing the development of a laminar boundary layer near the heat exchange plate are provided on both sides in the thickness direction of the portion of the heat exchange plate exposed to each of the fluid passages.

[Function] With this kind of configuration, the heat exchange plates are thin plates whose dimension in the flow direction is larger than their thickness, so it is not necessary to arrange the heat exchange plates relatively densely. In this case, the heat transfer area can be increased.

Moreover, the heat exchanger plates are placed intermittently to intersect with the heat insulating wall, which is continuous along the flow path, effectively suppressing heat intrusion in the direction of the flow path. can do.

Furthermore, since there is no part in the flow path surrounded by the heat insulating wall and the heat exchange plate where the cross-sectional area of the flow path rapidly expands or contracts along the flow direction, the flow path resistance may be significantly increased. This eliminates energy loss and heat generation caused by this.

Furthermore, since members are not laminated in the direction along the flow path, it is possible to reduce the thickness of the laminated layers.

In other words, the configuration shown in FIG.
In order to lengthen the flow path, it is necessary to correspondingly increase the number of laminated layers of heat exchange elements, heat insulating spacers, and adhesive epoxy resin prepreg interposed between them. There is no relationship between the number of layers and the length of the flow path. In other words, the number of laminated heat insulating sheets is related only to the opening size of the flow path, and the laminated thickness can be made relatively small without sacrificing heat exchange performance.

However, in order to form a heat insulating wall by adhering laminated epoxy resin prepreg heat insulating sheets to each other, it is necessary to apply pressure in the thickness direction while heating the laminated heat insulating sheets, but the laminated thickness is small. This allows each part to be compressed relatively uniformly without causing deformation when pressurized, and even if a general heating method of heating from above and below is adopted, each epoxy resin prepreg can be compressed at a relatively uniform temperature. makes it easier to heat. Therefore, it is possible to maximize the adhesion performance of the epoxy resin prepreg, and it is possible to relatively easily manufacture a high-performance heat exchanger with little gas leakage between channels.

Furthermore, since flow disturbance elements are provided on both sides in the thickness direction of the heat exchange plate that crosses each of the fluid passages, the development of a laminar boundary layer near the heat exchange surface of each heat exchange plate is prevented, The chances of contact between the heat exchange plate and the fluid flowing along the heat exchange surface of the heat exchange plate are substantially increased, and the heat exchange efficiency is improved.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, this heat exchanger has five heat insulating walls 3 _{1 to 3} between outer plates 1 and 2 made of thin stainless steel plates.
3 ₅ are arranged in parallel to _form low pressure fluid passages 4 ₁ and 4 2 between the heat insulating walls 3 ₁ and 3 ₂ and between the heat insulating walls 3 ₃ and 3 ₄ , respectively. High-pressure fluid passages 5 1 and 5 2 are provided between the walls 3 ₂ and 3 ₃ and between the heat insulating walls _{3 4} and 3 _{5 ,} respectively. A plurality of heat exchange plates 6 are provided to cross each of the fluid passages 4 ₁ , 4 ₂ , 5 ₁ , 5 ₂ .

To be more specific, the heat exchange plate 6 is a rectangular thin copper plate having a thickness of, for example, about 0.05 to 0.1 mm. On the other hand, the insulation walls 3 ₁ to 3 ₅
For example, a plurality of heat-insulating sheets 7 made of epoxy resin prepreg with a thickness of about 0.3 to 0.5 mm are laminated, and a part of the heat exchange plate 6 is sandwiched between these heat-insulating sheets 7. That is, a heat insulating sheet 7 is laid in the area where each of the heat insulating walls 3 ₁ to 3 ₅ is to be formed, and a plurality of heat exchange plates 6 are intermittently arranged on the heat exchange plates 6 at predetermined intervals in the longitudinal direction of the heat insulating sheet 7. let After that, a second heat-insulating sheet 7 is superposed on each heat-insulating sheet 7 via the heat-exchange plate 6, and a plurality of heat-exchange plates 6 are placed on top of the heat-exchange plate 6. They are arranged intermittently in a staggered arrangement. Next, a third heat-insulating sheet 7 is superposed on each heat-insulating sheet 7 via the heat-exchanging plate 6, and a plurality of heat-exchanging plates 6 are placed on the heat-exchanging plate 6. They are arranged intermittently in a staggered arrangement. The above operation is repeated multiple times to stack the necessary number of heat insulating sheets 7 and heat exchange plates 6. Then, the laminate is pressurized from above and below through the outer panels 1 and 2 by a press or the like, and heat is applied, and this state is maintained for a certain period of time to bond and harden the heat insulating sheet 7, thereby forming a heat exchanger. obtain. The prepreg constituting the heat insulating sheet 7 is made by impregnating reinforcing fibers such as glass fibers with epoxy resin, and the epoxy resin is not completely cured when laminated.

In such a heat exchanger, slits 8, which serve as flow disturbance elements, are provided on both sides of the heat exchange plate 6 in the thickness direction at the portions exposed to the respective fluid passages 4 ₁ , 4 ₂ , _{5 1} , 5 2 . The slits 8 are for preventing the development of a laminar boundary layer in the vicinity of the heat exchange surfaces 6a and 6b of the heat exchange plate 6.
As shown in FIG. 3, each of the fluid passages 4
Two holes are perforated perpendicularly to the flow at locations corresponding _{to 1} , 4 ₂ , 5 1 , and 5 ₂ .

With such a configuration, the low pressure gas L flowing through the low pressure fluid passages 4 ₁ and 4 ₂ and the high pressure gas H flowing in the opposite direction through the high pressure fluid passages 5 ₁ and 5 ₂ are Heat exchange will be performed via the exchange plate 6. In this case, since the slits 8 are provided in the portions of the heat exchange plates 6 exposed to the respective fluid passages 4 ₁ , 4 ₂ , 5 ₁ , 5 ₂ , the flow of the gases H and L is controlled by the slits 8. Disturbances such as vortices are generated and the development of a laminar boundary layer is prevented. That is,
When such a heat exchange plate m without slits 8 is used, a laminar boundary layer p is generated and developed near the heat exchange surface n of the heat exchange plate m, as shown in FIG. There is. Therefore, if the use is continued under such flow velocity conditions, the gases H and L will mainly flow outside the laminar boundary layer p, and the heat exchange efficiency will deteriorate significantly. In contrast, the device of the present invention can prevent the development of such a laminar boundary layer p by the slit 8, so even when used under the same conditions, the heat exchange efficiency can be greatly improved. It becomes possible to improve the performance. Therefore, with such a structure, high heat exchange efficiency can be maintained even if a heat exchange plate 6 having a relatively large width in the flow direction is used. Therefore, the number of heat exchange plates 6 used can be reduced without deteriorating performance, and manufacturing can be simplified.

Also, this one has fluid passages 4 ₁ , 4 ₂ , 5 ₁ , 5 ₂
Continuing along are the insulation walls 3 ₁ to 3 ₅ and the outer panels 1 and 2 made of stainless steel with low thermal conductivity.
only, and the heat exchange plate 6 is the heat insulating wall 3 ₁
They are arranged intermittently so as to intersect with ~ ₃₅ . Therefore, heat intrusion in the direction along the fluid passages 4 ₁ , 4 ₂ , 5 ₁ , 5 ₂ can be effectively suppressed.

Further, fluid passages 4 ₁ , 4 ₂ , 5 1 , 5 ₂ are surrounded by heat insulating walls 3 ₁ to 3 ₅ and heat exchange plates 6 _.
Since there is no part where the cross-sectional area of the flow path suddenly expands or contracts along the flow direction, the flow path resistance does not increase significantly, and energy loss and heat generation due to this are prevented.

Moreover, this heat exchanger includes fluid passages 4 ₁ , 4 ₂ , 5
Since the members are not stacked in the direction along the lines ₁ and 5 ₂ , it is possible to reduce the stacking thickness. Therefore, heating when bonding the laminated heat insulating sheets 7 to each other and the heat insulating sheets 7 and the heat exchange plate 6 becomes easy. In other words, with this type of device, it is easy to uniformly heat and pressurize each part, making it possible to maximize the adhesive performance of the prepreg, and creating a high-performance heat exchanger with no gas leaks. can be manufactured relatively easily.

Note that the flow disturbance elements provided on the heat exchange plate are of course not limited to those of the embodiments described above, and may be of the type shown in FIG. 4 or FIG. 5, for example. That is, the flow disturbance element 18 shown in FIG. 4 is in the form of a groove, and is provided at the same position as the slit. Also,
The flow disturbance element 28 shown in FIG. 5 is in the form of a protrusion that is perpendicular to the flow. Various modifications can be made to the flow-disturbing elements without departing from the spirit of the present invention, such as changing the number or position or selecting other shapes.

[Effects of the invention] Since the present invention has the above-described configuration, it is possible to prevent the development of a laminar boundary layer that occurs near the heat exchange plate and maintain high heat exchange efficiency. It is possible to effectively suppress heat intrusion in the direction along the heat exchanger, the structure is simple and easy to manufacture, and energy loss and heat generation inside the heat exchanger are reduced. Accordingly, it is possible to provide a horizontally laminated heat exchanger.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being a partially cutaway perspective view, Figure 2 being a perspective view showing a heat exchange plate, and Figure 3 being the same as in Figure 2.
FIG. 3 is an enlarged cross-sectional view taken along the line. Figures 4 and 5
The figures are a sectional view equivalent to FIG. 3 showing another embodiment of the present invention, and FIG. 6 is a sectional view equivalent to FIG. 3 showing a comparative example. FIG. 7 is a perspective view showing a conventional example. 1, 2...Exterior panel, _31-35 ...Insulating _wall , ₄₁ ,
4 ₂ , 5 ₁ , 5 ₂ ... fluid passage, 6 ... heat exchange plate, 7 ... heat insulation sheet, 8 ... flow disturbance element (slit), 18, 28 ... flow disturbance element.

Claims (1)

[Scope of utility model registration request] Insulating walls made by laminating and bonding epoxy resin prepreg insulation sheets in a direction perpendicular to the flow are installed in parallel to form multiple independent fluid passages between each of these insulation walls, and each of these fluid passages is crossed. A heat exchanger in which a plurality of heat exchange plates are intermittently arranged between the heat insulating sheets, and the heat exchange plates are in the form of a thin plate whose flow direction dimension is larger than its thickness dimension. It is characterized in that flow disturbance elements for preventing the development of a laminar boundary layer near the heat exchange plate are provided on both sides in the thickness direction of the portion of the heat exchange plate exposed to each of the fluid passages. A horizontally stacked heat exchanger.