JPH0614773U - Laminated plate heat exchanger - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a laminated plate heat exchanger that does not require a radiant heat shield plate when used in a refrigeration system. [Structure] The present invention is a laminated plate type heat exchanger in which two systems of fluid passages are formed in a stacking direction in a stacking body in which a plurality of porous heat transfer plates and heat insulating plates are alternately stacked. And a device having a relatively low temperature with respect to the laminated plate heat exchanger provided in the cavity. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a laminated plate heat exchanger used in a He liquefaction device or the like.

[0002]

[Prior art]

 FIG. 4 shows an example of a conventional laminated plate heat exchanger. 1 is a laminated body in which porous heat transfer plates (made of aluminum, etc.) and heat insulating plates (made of FRP, etc.) are alternately adhered via adhesive sheets; 2 is a high-temperature channel for passing the high temperature fluid provided in the laminated body 1. Reference numeral 3 is a low temperature passage for passing a low temperature fluid, 4 is a header for distributing a high temperature fluid and a low temperature fluid to the high temperature fluid passage 2 and the low temperature fluid passage 3, respectively. Low temperature fluid and high temperature fluid flow in and out. Reference numeral 5 denotes an outer shell made of stainless steel or the like for holding the laminated body 1 and the header 4, and 6 denotes a mandrel for aligning the heat transfer plate and the heat insulating plate when the laminated body 1 is assembled.

FIG. 5 shows the structure of the laminated body 1 of 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 formed, and usually FRP or the like having a high heat insulating property is used. Reference numeral 12 is 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 heat transfer plate 12 are alternately bonded via the adhesive sheet 13.

The high temperature fluid and the low temperature fluid pass through the high temperature channel 2 and the low temperature channel 3, respectively, and exchange heat with each other via the heat transfer plate 12. Further, the heat transfer in the stacking direction is blocked by the function of the heat insulating plates 11 alternately stacked with the heat transfer plates 12.

FIG. 6 shows an example of a He liquefaction / refrigeration system using the conventional laminated plate heat exchanger shown in FIG. This He liquefaction / refrigeration system consists of a JT (Joule-Thomson) cycle and a regenerator type small refrigerator. Reference numerals 20, 21, and 22 are the first heat exchanger, the third heat exchanger, and the fifth heat exchanger of the JT cycle, which are high-temperature and high-pressure He gas compressed by the He compressor 29 and low-temperature, low-pressure He gas. Heat exchange with the return gas. As the first heat exchanger 20, the third heat exchanger 21, and the fifth heat exchanger 22, conventional laminated plate heat exchangers are used. Reference numerals 23 and 24 respectively denote a second heat exchanger and a fourth heat exchanger of the JT cycle, which are high temperature and high pressure helium gas on the JT cycle side and a cold generation part 32 of the regenerator type small refrigerator 30. Heat exchange with 33. Reference numeral 25 is a J-T valve, and the first heat exchanger 20, the third heat exchanger 21, the fifth heat exchanger 22, the second heat exchanger 23, and the fourth heat exchanger are provided before reaching the inlet of this valve. The high-pressure He gas precooled at 24 is cooled to the liquefaction temperature by performing adiabatic expansion through the pores provided in this valve, and all or part of it is liquefied. Reference numeral 26 is a pipe for guiding the liquefied He to the outside of the vacuum container 34, 27 is a pipe for guiding the He gas after cooling the object to be cooled from the outside of the vacuum container 34 to the internal JT cycle, 28 Is a transfer tube for transferring liquid He and returning He gas between the He liquefying / refrigerating apparatus and the object to be cooled. Reference numeral 29 is a JT cycle He compressor. An impurity separator for separating oil and the like mixed in He gas is also included here (not shown). Reference numeral 30 denotes a regenerator type small refrigerator, for example, a GM (Gifford-McMahon) cycle or a reverse Stirling cycle is used. The high-pressure helium gas on the JT cycle side is cooled by the cold generation sections 32 and 33 of the regenerator type small refrigerator / freezer 30. Reference numeral 31 is a He compressor for the regenerator type small refrigerator 30. Like the He compressor 29 for the JT cycle, the He compressor 31 also includes an impurity separator (not shown). Reference numeral 34 denotes a vacuum heat insulating container, which keeps the inside vacuum to insulate heat entering from the outside. Reference numeral 35 is a radiant heat shield plate (made of copper or the like), which is in good thermal contact with the cold generation part 32 and is cooled to, for example, a temperature of about 70K. The radiant heat shield 35 radiates heat from the vacuum heat insulating container 34 and the like to the devices having relatively low temperatures such as the third heat exchanger 21, the fifth heat exchanger 22, the fourth heat exchanger 24, and the J-T valve 25. To reduce.

[0006]

[Problems to be solved by the device]

 The He liquefaction / refrigeration system using the conventional laminated plate heat exchanger has the following problems to be solved.

That is, in the He liquefaction / refrigeration system using the conventional laminated plate heat exchanger, it is necessary to install the radiant heat shield plate 35 made of copper or the like in order to reduce the radiant heat entering from the room temperature part to the low temperature part. However, there is a problem that the cost and weight increase.

In order to solve the above problems, the present invention provides a refrigeration system in which a cavity is provided in the inner stacking direction, and another heat exchanger or a JT valve, which has a relatively low temperature, can be installed in the cavity. An object of the present invention is to provide a laminated plate heat exchanger that does not require a radiant heat shield plate.

[0009]

[Means for Solving the Problems]

 As a solution to the above problems, the present invention provides a laminated plate heat exchanger in which two fluid passages are formed in the stacking direction in a laminated body in which a plurality of porous heat transfer plates and heat insulating plates are alternately stacked. Laminating plate type heat exchanger characterized by comprising a cavity provided so as to communicate with each other in a direction and a device having a relatively low temperature relative to the laminating plate type heat exchanger provided in the cavity. It is intended to provide an exchange.

[0010]

[Action]

 Since the present invention is constructed as described above, it has the following effects.

That is, in the He liquefaction / refrigerator using the laminated plate heat exchanger according to the present invention, other devices communicating with each other in the stacking direction and having a relatively low temperature in the internal space, such as a heat exchanger and a J-T. Since the valves are installed, the laminated plate heat exchanger itself also has a function as a radiant heat shield, and radiant heat to the devices installed in the internal space can be reduced. Therefore, it is not necessary to separately provide a radiant heat shield plate made of copper or the like.

[0012]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. The same components or components having the same function as those of the conventional example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

FIG. 1 is a partially cutaway perspective view of the laminated plate heat exchanger of the present embodiment (however, internal equipment is omitted), and FIG. 2 is a diagram showing the laminated body 1 of FIG. FIG. 3 is a plan view of the heat insulating plate 11 and the porous heat transfer plate 12, in which (a) is each of the heat insulating plate 11 and (b) is the view of the porous heat transfer plate 12, and FIG. 3 is the laminated plate heat exchanger of FIG. FIG. 3 is a vertical cross-sectional view of the He liquefaction / refrigeration device that has been used.

In FIG. 1, the laminated body 1, the high temperature fluid passage 2, the low temperature fluid passage 3, the header 4 and the outer shell 5 are the same as those in the conventional example shown in FIG. Reference numeral 7 denotes a relatively large-diameter space which is communicated in the center of the laminated body 1 and the header 4 in the laminating direction, and other heat exchangers, JT valves, etc. are installed in this space 7.

In FIG. 2, reference numeral 11 denotes a heat insulating plate constituting the laminate 1, which is made of FRP as in the conventional case, and 12 is a porous heat transfer plate made of aluminum as in the conventional case. The laminated body 1 is configured by joining the heat insulating plate 11 and the porous heat transfer plate 12 with an adhesive (not shown). In order to form the space 7 in FIG. 1, the heat insulating plate 11 and the porous heat transfer plate 12 are provided with a circular hollow 36 near the center thereof.

As described above, FIG. 3 is a diagram of a He liquefaction / refrigeration system using the laminated plate heat exchanger shown in FIG. 1. The laminated plate heat exchanger has a different aspect ratio depending on the application. , First heat exchanger 20 and the like. The functions of the respective devices in FIG. 3 are exactly the same as those in the conventional example shown in FIG. That is, in the present embodiment, the JT valve 25 and the fifth heat exchanger 22, which have the lowest temperature among the constituent devices of the present He liquefaction / refrigerator, are installed near the center of the device so as to surround them. A third heat exchanger 21 is installed, and the first heat exchanger 20 having the highest temperature is installed at the outermost part so as to surround the third heat exchanger 21. Further, cover plates made of copper or the like (not shown) are installed on the upper and lower surfaces of the first heat exchanger 20 and the third heat exchanger 21 in the figure so as to close the cavities.

In the present He liquefaction / refrigeration system, the first heat exchanger 20 is cooled from room temperature to a temperature of about 70 K, and the radiant heat to the third heat exchanger 21 and the second heat exchanger 23 installed inside the first heat exchanger 20 is cooled. Shield. Further, the third heat exchanger 21 is cooled to a temperature of about 60K to 20K, and the radiant heat to the fifth heat exchanger 22, the fourth heat exchanger 24 and the J-T valve 25 installed inside the third heat exchanger 21 is shielded. To do.

Therefore, there is an advantage that the radiant heat shield plate 35 as shown in FIG. 6 of the conventional example is not required, the weight is reduced, and the cost is reduced.

[0019]

[Effect of device]

 Since the present invention is configured as described above, it has the following effects.

That is, in the He liquefaction / refrigerator using the laminated plate heat exchanger according to the present invention, radiant heat can be reduced without separately providing a radiant heat shield plate made of copper or the like, so that cost and weight can be reduced. There is an effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a laminated plate heat exchanger according to an embodiment of the present invention,

FIG. 2 is a plan view of a constituent material of the laminated body shown in FIG. 1, where (a) is a heat insulating plate and (b) is a porous heat transfer plate;

FIG. 3 He using the laminated plate heat exchanger of the above embodiment
Liquefaction / refrigerator vertical section,

FIG. 4 is a perspective view of a conventional laminated plate heat exchanger,

FIG. 5 is an exploded perspective view showing the structure of a conventional laminated body,

FIG. 6 He liquefaction / using a conventional laminated plate heat exchanger
It is a longitudinal cross-sectional view of a refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated body 2 High temperature fluid passage 3 Low temperature fluid passage 4 Header 5 Outer shell 7 Space 11 Heat insulating plate 12 Porous heat transfer plate 20 1st heat exchanger 21 3rd heat exchanger 22 5th heat exchanger 23 2nd heat exchanger 24 4th heat exchanger 25 J-T valve 26, 27 Piping 28 Transfer tube 29 He compressor 30 Regenerator type small refrigerator 31 He compressor 32, 33 Cold generation part 34 Vacuum insulation container 36 Hollowing

Claims (1)

[Scope of utility model registration request] 1. A laminated plate type heat exchanger in which two systems of fluid passages are formed in a laminating direction in a laminated body in which a plurality of porous heat transfer plates and heat insulating plates are alternately laminated are provided so as to communicate with each other in the laminating direction. And a device having a relatively low temperature with respect to the laminated plate heat exchanger provided in the cavity.