JPH072764U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Object] To provide a heat exchange device capable of efficiently exchanging a large amount of fluid with heat and simplifying the structure. [Structure] A heat exchange passage 10 is arranged inside a heat exchange container for supplying and discharging liquefied nitrogen as a heat transfer medium. In the heat exchange channel 10, the annular pipes 18 are arranged in a plurality of rows, and the communicating pipes 1 are arranged at a plurality of positions where the adjacent annular pipes 18 are displaced in the circumferential direction.
9, and the tanks 20 and 2 are connected to the supply port side and the discharge port side.
Connect 1 The supply pipe 11 is connected to the tank 20, and the discharge pipe 12 is connected to the tank 21. Since the positions of the inflow port and the outflow port in each annular pipe 18 are displaced in the circumferential direction, the fluid flows in a turbulent state while repeatedly colliding with the wall surface of the heat exchange channel 10, and is greatly affected by the temperature of the wall surface. To do so.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a heat exchange device.

[0002]

[Prior art]

 Conventionally, nitrogen, oxygen, argon, and other gases are liquefied and stored in an ultra-low temperature storage tank, and when used, the stored liquefied gas is guided to an evaporator and evaporated at atmospheric temperature or hot water. And gasify it.

However, conventionally, the cold heat of the liquefied gas is not effectively used, and it is made useless. In order to effectively use this cold heat to cool a gas such as air, nitrogen, oxygen, argon, hydrogen, or a fluid such as a mixed gas of liquid and gas, a heat exchanger is interposed between the ultra-low temperature storage tank and the evaporator. It is possible to make it.

As the conventional heat exchanger, various configurations such as a coil type, a double pipe type, a water injection type, a sleeve type, and a finned multi-pipe type are known.

[0005]

[Problems to be solved by the device]

 However, in the conventional heat exchanger as described above, the fluid to be cooled regularly flows in the pipe and the influence of the temperature received from the wall surface of the pipe is small, so that the cooling effect is poor. Therefore, if the downstream side is throttled like an expansion valve to enhance the cooling effect, a large amount of fluid cannot be cooled. Therefore, the conventional heat exchanger has a problem that it cannot be used when a large amount of fluid of a constant temperature is required to be secured.

The present invention solves the above-mentioned conventional problems, and can efficiently heat-exchange a large amount of fluid without narrowing down the fluid, and therefore a large amount of constant pressure and constant temperature. The heat exchange fluid can be obtained for convenience of use, and the configuration can be simplified. Therefore, failure can be eliminated and cost can be reduced. It is an object of the present invention to provide a heat exchange device that can be used.

[0007]

[Means for Solving the Problems]

 The technical means of the present invention for achieving the above-mentioned object is a heat exchange container to which a heat transfer medium is supplied and discharged, and a plurality of heat exchange containers arranged in parallel in the heat exchange container in a circumferential direction communicating in the circumferential direction. A heat exchange flow passage having a communication flow passage that communicates a plurality of locations between these flow passages in the circumferential direction so that the positions of the inlet and the outlet in each circumferential flow passage are displaced in the circumferential direction; The container is provided with a fluid supply passage and a fluid discharge passage that are inserted into the container and communicate with the heat exchange passage.

Further, in the above technical means, it is preferable that the heat exchange flow path has a tank on the supply port side and a tank on the discharge port side, and that each tank communicates the supply path and the discharge path.

[0009]

[Action]

 According to the present invention configured as described above, when the heat exchange container is filled with the heat transfer medium and the fluid for heat exchange is supplied from the supply passage to the heat exchange passage, the heat exchange passage is supplied with heat. The generated fluid flows through the circumferential flow passages, which are arranged in parallel, and the communication flow passages that connect these fluids, but the positions of the inlet and outlet in the circumferential flow passages are displaced in the circumferential direction. , The fluid repeatedly collides with the wall surface of the heat exchange flow path and forms a turbulent flow, during which the heat of the heat transfer medium can be removed, and the fluid after heat exchange is discharged to the outside of the heat exchange container through the discharge path. can do. In this way, the fluid is subjected to turbulent flow while repeatedly colliding against the wall surface of the heat exchange flow path, and the fluid is greatly affected by the temperature of the wall surface. Since the fluid sent from the channel is dispersed under the same conditions, a large amount of fluid can be efficiently heat-exchanged without narrowing the fluid. In addition, since the heat exchange flow path can be configured by connecting the flow paths, the structure can be simplified.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a main part showing a heat exchange device according to an embodiment of the present invention, and FIG. 2 is a schematic system diagram showing an example of use in which the heat exchange device is incorporated between a liquid nitrogen ultra-low temperature storage tank and an evaporator. Is.

As shown in FIG. 2, the ultra low temperature storage tank 1 can store liquefied nitrogen at −196 ° C., and the bottom of the ultra low temperature storage tank 1 is at the bottom of the heat exchange container 3 of the heat exchange device 2 of the present invention. A pipe 5 communicates with each other, and a valve 5 is provided in the middle of the pipe 4. The upper part of the heat exchange container 3 is connected to the inlet of the evaporator 6 by a pipe 8, and the outlet of the evaporator 6 is connected to a supply pipe 9. A heat exchange flow passage 10 is arranged in the heat exchange container 3 of the heat exchange device 2 as described later, and the dry air supply pipe 11 and the exhaust pipe inserted into the heat exchange container 3 are arranged in the heat exchange flow passage 10. 12 is communicated with. Valves 13 and 14 are provided in the middle of the supply pipe 11 and the discharge pipe 12, and the discharge pipe 12 is connected to the tank 15. A plurality of supply pipes 16 communicate with the tank 15, and a valve 17 is provided in the middle of each supply pipe 16.

As shown in FIG. 1, the heat exchange flow passage 10 includes an annular pipe 18 which is a circumferential flow passage and which communicates in the circumferential direction, a communication pipe 19 which is a communication flow passage, a tank 20 on the supply port side, It consists of a tank 21 on the outlet side. The annular pipes 18 are arranged in a plurality of rows (five rows in the illustrated example) in parallel so as to have a desired space in the vertical direction around the vertical axis, and the adjacent annular pipes 18 are connected in the vertical direction at a plurality of locations. 19 communicate with each other. The communication pipes 19 in the upper and lower rows are alternately displaced in the circumferential direction and are arranged at substantially equal intervals, so that the positions of the inflow port and the outflow port of the annular pipes 18 in each row are circumferentially alternated. The inlets and outlets are offset so that they do not face each other on a straight line. A tank 20 on the supply port side and a tank 21 on the discharge port side are arranged in the lower inner side and the upper inner side of the annular pipes 18 in a plurality of rows. The tanks 21 on the outlet side are communicated with each other by the communication pipes 22 arranged radially, and the upper end of the tank 21 on the discharge port side is communicated with the communication pipes 23 arranged radially. The supply pipe 11 is connected to the bottom of the tank 20 on the supply port side, and the discharge pipe 12 is connected to the bottom of the tank 21 on the discharge port side.

The heat exchange container 3, the annular pipe 18, the communication pipe 19, the tanks 20 and 21, the communication pipes 22 and 23, the supply pipe 11 and the discharge pipe 12 which constitute the heat exchange flow path 10 withstand low temperatures. It is made of a material such as stainless steel or copper.

The operation of the above configuration will be described below. Liquefied nitrogen, which is a heat transfer medium, is supplied from the ultra-low temperature storage tank 1 into the heat exchange container 3 of the heat exchange device 2 by a pipe 4 and filled therein. A heat insulating material 7 is applied to the container 3 to prevent freezing. In this state, dry air for cooling by heat exchange is supplied from the supply pipe 11 to the supply port side tank 20 of the heat exchange passage 10 immersed in liquefied nitrogen. The dry air supplied into the tank 20 flows into the lowermost annular pipe 18 through the communication pipe 22, and from the lowermost annular pipe 18 through the communication pipe 19 into the upper annular pipe 18. To do. The dry air sequentially flows into the upper annular pipe 18 through the communication pipe 19, and then flows from the uppermost annular pipe 18 through the communication pipe 23 into the tank 21 on the outlet side. In this way, while the dry air flows, in each of the pipes 18, 19, 22, 23 and the tanks 20 and 21, the cold heat of the liquefied nitrogen, which is the refrigerant, is taken from the wall surfaces of the pipes 18, 19, 22, 23 and the tanks 20 and 21 to be cooled. At this time, when the dry air flows into the lowermost annular pipe 18 from the communication pipe 22, it collides with the wall surface of the annular pipe 18, and as described above, the position of the inlet in the annular pipe 18 in each row is in the circumferential direction. Since the inlet and outlet are set so that they do not face each other on a straight line, when dry air flows into the annular pipe 18 from the communicating pipe 19, it collides with the wall surface of the annular pipe 18 and Further, similarly, it inflows from the adjacent communication pipe 19 and collides with the dry air separated by colliding with the wall surface of the annular pipe 18 and becomes a turbulent flow to sequentially flow to the uppermost annular pipe 18. In this way, the dry air repeatedly collides with the wall surface and flows in a turbulent state in which the temperature of the wall surface greatly affects the dry air sent from the communication pipe 19 of each line in each annular pipe 18. Since dry air does not flow only in a certain line and is dispersed under the condition, it is possible to efficiently remove the cold heat from the liquefied nitrogen. The same applies when the supply pipe 11 has an adverse effect on the exhaust pipe and the exhaust pipe 12 has an adverse effect on the supply pipe.

The dry air cooled by the heat exchange flows out of the tank 21 through the exhaust pipe 12 to the tank 15, where it can be distributed to desired use sites by the plurality of supply pipes 16. At each site of use, the temperature can be adjusted to an appropriate temperature by mixing with normal temperature air before use. On the other hand, the liquefied nitrogen deprived of cold heat by the heat exchange is guided to the evaporator 6 by the pipe 8 and evaporated at atmospheric temperature or hot water to become nitrogen gas. The nitrogen gas thus obtained can be supplied to a desired site of use through the supply pipe 9.

Whereas liquefied nitrogen is directly supplied to the evaporator 6 as in the conventional case, if it is supplied to the evaporator 6 after being used for heat exchange by the heat exchange device 2 of the embodiment of the present invention. Since the temperature of the liquid nitrogen is rising, the evaporation efficiency of the evaporator 6 can be improved.

As described above, according to the above-described embodiment, since a large amount of dry air can be efficiently heat-exchanged without narrowing down the dry air, a large amount of dry air cooled to a constant temperature can be obtained. You can Further, since the dry air is temporarily stored from the supply pipe 11 to the tank 20 on the supply port side, the dry air can be supplied to the communication pipe 19 of each line at a constant pressure and a constant flow rate. Further, since the dry air after being cooled to a constant temperature from the communication pipe 19 of each line is temporarily stored in the tank 21 on the outlet side, the dry air after cooling should be supplied to the site of use at a constant pressure and a constant flow rate. You can By increasing the diameter, area and length of the annular pipe 18, the communication pipe 19 and the like and the volumes of the tanks 20 and 21, the dry air to be cooled can be easily increased.

In the above embodiment, the tubes 18, 19, 11, 12 having a circular cross section are used for the circumferential flow passage, the communication flow passage, the supply passage, the discharge passage, etc. Good. Further, the circumferential flow path is not limited to the annular shape, and may be a rectangular shape, and the communication pipes 19 may not be arranged at equal intervals. In addition to liquefied nitrogen, a refrigerant such as liquefied oxygen or liquefied argon can be used as the heat transfer medium, and a heat medium can be used for the purpose of raising the temperature and heat exchange can be performed. As the fluid to be used, not only dry air but also gases such as nitrogen, oxygen, hydrogen, argon and natural gas, and a mixed gas of liquid and gas can be used. Further, the annular pipes 18, which are the circumferential flow passages, may be arranged in a plurality of rows in parallel in the lateral direction around the horizontal axis. In addition, the present invention can be modified in various ways without departing from the basic technical idea thereof.

[0019]

[Effect of device]

 As described above, according to the present invention, when the heat exchange container is filled with the heat transfer medium and the fluid for heat exchange is supplied from the supply passage to the heat exchange passage, the supplied fluid is supplied in the heat exchange passage. Flow through the circumferential flow passages arranged in parallel with each other and the communication flow passages that connect them, but since the positions of the inlet and the outlet in the circumferential flow passages are displaced in the circumferential direction, the fluid is While repeatedly colliding with the wall surface of the heat exchange flow path, it forms a turbulent flow, during which the heat of the heat transfer medium can be removed, and the fluid after heat exchange must be discharged to the outside of the heat exchange container through the discharge path. You can By repeatedly colliding the fluid with the wall surface of the heat exchange flow path and flowing it in a turbulent state, the fluid is greatly affected by the temperature of the wall surface, and moreover, each communication is made in each circumferential flow path. Since the fluid sent from the flow path is distributed under the same conditions without flowing through a specific communication path, a large amount of fluid can be efficiently heat-exchanged without narrowing down the fluid. it can. Therefore, it is possible to obtain a large amount of the heat exchange fluid at a constant temperature, which facilitates its use. Further, since the heat exchange flow path can be formed by connecting the flow paths, the structure can be simplified. Therefore, the failure can be eliminated and the cost can be reduced.

Further, the heat exchange flow path has tanks on the supply port side and the discharge port side, and by connecting the supply passage and the discharge passage to each tank, the fluid is once transferred from the supply passage to the tank on the supply inlet side. The fluid can be stored and supplied to the communication channels of each line at a constant pressure and a constant flow rate, and the fluid that has undergone heat exchange from the communication channels of each line to a constant temperature is temporarily stored in the tank on the exhaust port side. Since it can be stored and supplied to the site of use at a constant pressure and a constant flow rate, it can be used more stably.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part of a heat exchange device according to an embodiment of the present invention.

FIG. 2 is a schematic system diagram showing a usage example in which the same heat exchange device is incorporated between a liquefied nitrogen ultra-low temperature storage tank and an evaporator.

[Explanation of symbols]

 2 heat exchange device 3 heat exchange container 10 heat exchange flow passage 11 supply pipe 12 discharge pipe 18 annular pipe (circumferential flow passage) 19 communication pipe 20 tank on supply side 21 tank on discharge side

Claims (2)

[Scope of utility model registration request] 1. A heat exchange container in which a heat transfer medium is supplied and discharged, a plurality of circumferential flow passages arranged in parallel in the heat exchange container and communicating in the circumferential direction, and between these circumferential flow passages. A heat exchange flow path having a communication flow path in which a plurality of locations communicate with each other so that the positions of the inlet and the outlet in each circumferential flow path are displaced in the circumferential direction, and the heat exchange container is inserted into the heat exchange flow path. A heat exchange device having a fluid supply path and a fluid discharge path that are in communication with each other. 2. The heat exchange device according to claim 1, wherein the heat exchange passage has tanks on the supply port side and the discharge port side, and the supply passage and the discharge passage communicate with each tank.