JP2006003034A - Method of manufacturing cold storage capsule - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safe manufacturing method free from firing, of a cold storage capsule capable of inexpensively manufacturing the cold storage capsule by maximizing a volume ratio of a enclosed capacity of a cold storage material with respect to a size of the cold storage capsule, and encapsulating the cold storage material having inflammability such as paraffin, by welding or the like. <P>SOLUTION: A cylindrical tube is cut, both end parts of the tube are drawn, then one end is welded to close its opening, a cold storage agent is poured from an opening part of the other end, and then the end part is closed by caulking, and then welded. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a regenerator capsule that is a part of a regenerator used in an air conditioner.

There are two general types of regenerators (heaters) used in air conditioners: a shell and tube method and a capsule method. The capsule method is said to have better charging efficiency of the regenerator material than the shell and tube method, and the capsule method is often used when installed in a relatively narrow space.
As an example of an air conditioner in which a regenerator needs to be installed in a narrow space, a technique for maintaining comfort in a vehicle by operating an air conditioner of an automobile (vehicle) has been studied. During cooling, a compressor (compressor) that is directly connected to the engine rotation is operated, and high-pressure gaseous refrigerant such as chlorofluorocarbon is sent to the condenser and liquefied by the outside air. Sent. In the evaporator, air cooled by the latent heat of vaporization of the refrigerant is sent into the room and air conditioning in the vehicle is performed. During heating, the refrigerant passes through the same path as described above, but in the evaporator, the air is dehumidified by the latent heat of vaporization of the refrigerant, and the temperature of the air is adjusted by the heater to perform vehicle interior air conditioning.

If a regenerator is installed in front of the evaporator in the refrigerant heat cycle of this general vehicle air conditioner, the refrigerant is circulated by the compressor during operation of the vehicle. Cold energy is stored. An example of the system in this case is shown in FIG. In FIG. 9, 31 is an engine, 32 is a compressor, 33 is a condenser, 34 is an electric valve, 35 is a regenerator, 36 is a centrifugal electric pump, 37 is a three-way valve, 38 is an evaporator, 39 is outside air or inside air, And 40 indicate cold air, respectively. In addition, the solid line arrows indicate the refrigerant flow during normal operation, and the dotted line arrows indicate the refrigerant flow when using the regenerator. When the compressor 32 is stopped when the vehicle engine 31 is stopped, the refrigerant is circulated between the regenerator 35 and the evaporator 38 by the centrifugal electric pump 36 or the like. In-vehicle air conditioning can be performed even when the engine is stopped instead of the condenser during operation by the amount of heat stored in the regenerator 35.
Examples of using a regenerator for an air conditioner installed in such a small space include those described in Patent Documents 1 to 5, for example. In a regenerator (heat) device using a regenerator capsule, a regenerator (heat) material is enclosed in a capsule whose inside is sealed. When storing cold heat, the cold storage material is cooled from the outside of the capsule by a cold fluid whose temperature is below the melting point, and the cold storage material itself solidifies and stores the cold energy of the latent heat of the stored cold storage material, which requires cold heat. Then, the fluid to be cooled is caused to flow outside the capsule, and the fluid to be cooled is cooled by the movement of latent heat due to the melting of the cold storage material inside the capsule. In the air conditioning equipment, the fluid to be cooled is a refrigerant (generally a lot of chlorofluorocarbons), and when the cold storage heat is used, the refrigerant is condensed (phase change) outside the cold storage capsule. In addition, when the thermal energy is stored and used as the heat accumulator, the reverse is performed, and when the stored heat is utilized, the refrigerant that is the fluid to be heated is evaporated (phase change) from the liquid.

Examples of the cold storage (heat) capsules that show improved examples for improving the heat exchange characteristics include those described in Patent Documents 6 to 7. These known documents disclose improvement techniques such as attaching an internal fin to the portion where the cold storage (heat) agent and the capsule wall surface are in contact with each other, in particular, in order to enhance the heat exchange characteristics of the cylindrical cold storage (heat) capsule. It is. FIG. 8 is an explanatory diagram of an example of a regenerative heat capsule shape in which fins are attached to the inner surface. (A) is an external view of a cool storage heat capsule, and the dotted line has shown the internal fin. (B) shows sectional drawing of a cool storage heat capsule. (C) is a detailed explanatory view of the fin portion. Where D is the capsule outer diameter, d is the capsule inner diameter, h is the fin height, t is the capsule thickness, α is the apex angle of the fin, Rft is the radius of curvature of the fin tip, and Rfb is the radius of curvature of the fin bottom. Each is shown.
JP 2003-285634 A Japanese Patent Laid-Open No. 6-211036 Japanese Unexamined Patent Publication No. 7-76208 JP 2000-313226 A JP 2001-287539 A Japanese Patent Laid-Open No. 11-270975 JP 55-56597

  When a capsule type regenerator is applied to an air conditioner that needs to be installed in a small space represented by the vehicle as described above, the size (volume) of the regenerator heat capsule is enclosed inside. It is necessary to increase the amount of cold storage material as much as possible. The regenerator used in the air conditioner is an auxiliary device installed for the purpose of reducing driving force energy in the heat cycle of the air conditioner. Therefore, it must be supplied inexpensively.

As a regenerator material using latent heat, it is well known that water is inexpensive and has large latent heat. Therefore, it is often used as a cold storage material. However, water cannot change the phase change temperature (melting point) unless a large pressure is changed, and if the operating temperature of CFC, a general refrigerant, is not adjusted to a temperature that can use the latent heat of water, the regenerator There is a problem that does not fulfill the function. Therefore, paraffin having a melting point (freezing point) that can use latent heat at about 1 to 30 ° C. is often used as a cold storage material. However, since paraffin is flammable, it must be handled with care.
Conventionally, in the manufacture of a cold-storage capsule, a method of welding the end of the capsule after enclosing the paraffin has been taken. However, since paraffin adheres to the welded portion, there is a danger that the paraffin may ignite during welding and a fire may occur.

Furthermore, the regenerator used in the vehicle air conditioner is an auxiliary device that is not originally required when the vehicle engine performs air conditioning while the vehicle engine is in operation, and it is important that the regenerator is small or lightweight. For this reason, it is recognized that it is effective to reduce the size and weight of the regenerator (heat) by using the regenerator (heat) capsule disclosed in Patent Document 6 and Patent Document 7, but such a complicated shape. In order to realize such a cold storage (heat) capsule having a low temperature and a safe manufacturing process that improves the above-described problems, it is indispensable.
As described above, there are many known examples of regenerators of the regenerator capsule type that are proposed as effective for improving the efficiency of vehicle air conditioners and the like. There are many problems.

  The object of the present invention is to provide a method for producing a cold-storage capsule that solves the above-mentioned conventional problems. Specifically, it is to provide a method that can be manufactured at a low cost so that the volume ratio of the amount of the regenerator material to be encapsulated is as large as possible with respect to the size of the regenerator heat capsule. It is another object of the present invention to provide a safe manufacturing method that does not ignite even a cold-storage heat capsule that encloses a flammable cold-storage material such as paraffin by welding or the like. Furthermore, it is to provide a manufacturing method capable of manufacturing a plurality of cold storage heat capsules in one step and reducing the manufacturing cost.

The present invention
(1) After cutting the tubular tube and drawing both ends, weld one end to close the mouth, inject cold storage heat material from the opening at the other end, and then close the end by caulking A method for producing a regenerative heat capsule characterized by welding its end after being performed,
(2) Cut the tubular tube, reduce the diameter of both ends according to the inner shape and height of the cap having the same outer shape as the tube, join one end with the cap, and then cool storage heat material And the other end is welded with another cap having the same outer shape as the pipe,
(3) The tubular tube is cut, and a plurality of tubes having an outer diameter smaller than the inner diameter of the tubular tube are inserted, and at the same time, a cold storage heat material is injected from the inside of the inserted tube. Manufacturing method of cold storage heat capsule,
(4) After cutting the tubular tube and closing one end of the tube by caulking, the end is welded and the other end is matched to the inner shape and height of the cap having the same outer shape as the tube. A method for producing a regenerative thermal capsule, characterized in that the diameter is reduced by an amount, the cap is joined, and the cap is closed
(5) One end of the tube is closed by brazing or welding to a plate or cap-shaped connector corresponding to the closed portion of the end of the regenerative heat capsule composed of a plurality of tubes, and cold storage is performed from the other end of the tube A method for producing a regenerative heat capsule, comprising injecting a heat material, and then closing the other end of the tube by brazing or welding to a plate-like or cap-shaped connecting body corresponding to a closed portion of the end of the regenerative heat capsule ,
(6) A tube is manufactured while injecting a regenerative heat material at the same speed as the extrusion speed at which the tube is formed by extrusion, and the tube is crushed from the outer surface of the tube, and the end is mechanically closed and cut. A method for producing a regenerative heat capsule characterized by welding portions;
(7) It is characterized in that a tube is manufactured while injecting a cold storage heat material at the same speed as the extrusion speed for forming the tube, compressing and closing the side of the tube, then cutting, and then welding the closed portion. A method for producing a cold-storage capsule,
(8) The material used as the base material of the capsule is formed into a hollow container with one end in the longitudinal direction closed by extrusion, a cold storage heat material is injected from the opening, and then the opening is closed by brazing or welding. A method for producing a cold-storage capsule, characterized by:
(9) In the method for manufacturing a regenerator capsule according to any one of (1) to (7), the end of the regenerator heat capsule has a melting point lower than the melting point of the capsule base material. In the method for manufacturing a regenerator heat capsule characterized by closing using a brazing material and the method for manufacturing a regenerator heat capsule described in (10) and (9), when closing the end of the regenerator heat capsule An object of the present invention is to provide a method for manufacturing a cold-storage capsule, characterized by applying ultrasonic waves to a base material and soldering.

  According to the manufacturing method of the present invention, it is possible to make the volume ratio of the enclosed amount of the regenerator material as large as possible with respect to the size of the regenerator heat capsule. Also, a cold storage heat capsule that encloses a flammable cold storage material such as paraffin by welding or the like can provide a safe manufacturing method so as not to ignite. Furthermore, the manufacturing cost can be reduced by providing equipment capable of manufacturing a plurality of cold storage heat capsules in one step. As a result, it is possible to provide a regenerator and heat exchanger attached to an air conditioner for high efficiency at a low cost, thereby promoting practical use and spread.

  Hereinafter, although the preferable embodiment of the manufacturing method of the cool storage heat capsule of this invention is described in detail, this invention is not limited to this.

First, the manufacturing process according to the first embodiment is shown in FIG. Here, a cylindrical tube such as a metal tube is cut by a conventional method to form a capsule original tube 1 (a). Next, after the A end 2 and the B end 3 are drawn by a conventional method (b), only the B end 3 is welded to close the mouth (c). At this time, the other end A end 2 is an opening in which the mouth of the end is opened only by a half as shown in (d) and (e). In addition, (e) is the enlarged view which looked at A edge part 2 from upper direction. Next, the regenerator material 4 such as paraffin or the like is injected from the opening of the A end portion 2 using a syringe (f), and the end portion is closed by caulking by a conventional method (g and h). In addition, (h) is the enlarged view which looked at the A edge part 2 at this time from the upper direction. Finally, the A end 2 is welded by a conventional method.
According to this method, since there is a difference from the conventional welding only method, there is a risk of igniting even if a flammable regenerator material (paraffin) is injected, since mechanical sealing is performed and then final welding is performed. Absent. In addition, since the capsule is produced by deforming the capsule original tube without using a new material for the processing of the capsule end, the material cost itself can be only the original tube of the capsule, so that it can be manufactured at low cost. In addition, although the case where the capsule outer shape is a cylindrical shape is shown in the example, the shape is not limited to this, and the same applies to a polygonal column shape.

The manufacturing process according to the second embodiment is shown in FIG. Here, a cylindrical tube is cut by a conventional method to form a capsule original tube 1 (a). Thereafter, both ends of the A end portion 2 and the B end portion 3 are reduced in diameter by a conventional method by an amount corresponding to the inner shape and height of the cap 5 having the same outer shape as the capsule original tube 1 (b), The cap 5 is joined to the end 3 (c). Next, cold storage material 4 such as paraffin is poured from the opening of the A end 2 (d), and the A end 2 is welded by a conventional method with a cap 5 attached. The cap 5 is preferably made of the same material as the capsule original tube 1.
When the capsule end is welded by caulking, the regenerator heat material cannot be enclosed in the capsule end, and the filling rate of the regenerator heat material may decrease with respect to the capsule volume size. In the second embodiment, Since the regenerator material can be enclosed up to the capsule end, the filling rate of the regenerator material can be increased. In addition, since a flammable regenerator material (paraffin) is injected from a wide opening, the regenerator material hardly adheres to the surface to which the cap is welded, and there is little risk of ignition during welding. Since the outer diameter (outer shape) of the cap is the same as the outer diameter (outer shape) of the metal tube that is the original tube of the regenerator heat capsule, a gap may be generated even if this capsule is arranged in the regenerator. No, the capsules can be arranged efficiently when manufacturing the regenerator. Note that FIG. 2 shows a case where the capsule outer shape is a cylindrical shape, but the same applies to a polygonal column shape as in the first embodiment.

A manufacturing process according to the third embodiment is shown in FIG. Here, a cylindrical tube is cut by a conventional method to form a capsule original tube 1 (a). Next, one end of the capsule raw tube 1 is welded by a conventional method (b). Next, a plurality of internal metal tubes 8 having an outer diameter smaller than the inner diameter of the capsule original tube 1 are inserted (preferably press-fitted), and a regenerator material is injected into the inner metal tube 8 by a syringe 7 or the like (c ). (D) shows a state in which the internal metal tube represented by the dotted line is completely inserted into the capsule original tube 1. Finally, the lower one end 6 of the original capsule 1 that has been opened is welded by a conventional method (e). Closing of the upper opening is performed by caulking, or by applying a cap and then welding one end 6.
When a flammable cold storage material is injected with a syringe, the cold storage material remaining at the tip of the needle of the syringe slightly adheres to the surface to be welded when the syringe is pulled out, and there is a risk of ignition during welding. On the other hand, in this third embodiment, even if the paraffin remaining on the syringe needle adheres to the pipe, it does not adhere to the weld surface of the metal pipe to be welded, so the risk of ignition is reduced. . Moreover, since the press-fitted inner tube can obtain the same effect as providing the fins on the inner surface of the capsule, it is useful for reducing the number of capsules used in the entire regenerator. In addition, although the thing which deform | transforms the metal pipe which is an original pipe | tube is described in the illustration, it is the same also when using the cap which is a 2nd embodiment for pipe | tube end enclosure.

  In the first to third embodiments, even if the same closing method is not used for closing both ends, in the manufacturing process, one end is carried out by caulking and welding, and the other end is joined by a cap. There is no problem (fourth embodiment).

A manufacturing process according to the fifth embodiment is shown in FIG. Here, one end of the tube 1 is brazed or welded to a cap-shaped connecting body 9 having a shape corresponding to the closed portion at the end of the capsule original tube 1 composed of a plurality of metal tubes by a conventional method (a). . In addition, (b) is a top view of the coupling body of a cap. The cold storage heat material 4 is injected from the other end (c), and then one end of the tube 1 is brazed or welded to the cap-shaped connecting body 9 (d) and closed (e).
If the fifth embodiment is used, a plurality of capsules manufactured by the manufacturing method of the second embodiment can be manufactured at a time, which is effective in reducing the cost in the manufacturing process.

A manufacturing process according to the sixth embodiment is shown in FIG. Here, the tubular body 18a is manufactured while injecting the cold storage heat material at the same speed as the extrusion speed for forming the tubular body 18a by extrusion (a), and the tube is crushed with a roller or the like from the outer surface of the tube to end the end portion. Is mechanically closed and cut (b), then the capsule end is mechanically closed (c) and finally the closed part is welded (d). In FIG. 5, 11 is a material (metal wire), 12 and 13 are rollers, 14 is an extrusion die, 15 is a cold storage material, 16 is a movable cold storage material injection machine, 17 is a rotary roller crusher, and 18a is Tubular body, 18 is a capsule tube, 19 is a mechanically encapsulated capsule end, and 20 is a welded capsule end.
In the sixth embodiment, the step of enclosing the regenerator material inside the capsule can be performed simultaneously with the manufacturing process of the tube material that is the prototype of the capsule. That is, the regenerative heat capsule is manufactured almost simultaneously with the manufacturing time of the capsule prototype tube material, and continuous mass production becomes possible. As a result, significant cost reduction can be achieved.

A manufacturing process according to the seventh embodiment is shown in FIG. Here, the tubular body is manufactured while injecting the cold storage heat material at the same speed as the extrusion speed for forming the tubular body by extrusion (a), and the tube side surface of the cold storage heat capsule is compressed and closed and then cut (b). Then, the closed portion is welded (c). The reference numerals in the respective drawings are the same as those in FIG.
The seventh embodiment is an improvement in which a plurality of cold storage capsule production equipment according to the sixth embodiment can be processed simultaneously. The mass production speed is improved as compared with the sixth embodiment, and the cost can be further reduced.

The manufacturing process according to the eighth embodiment is shown in FIG. Here, the material 21 that becomes the base material of the capsule is extruded by the arrow method (a), and the container 22 is closed at one end in the hollow longitudinal direction. The cold storage material 23 is injected from the opening of the container 22, and then the opening is closed by brazing or welding to form the closing portion 24 (c).
In the eighth embodiment, one of the end portions of the capsule is already closed in the extrusion stage by the extrusion of the capsule base material, and the end closed portion after the injection of the regenerative heat storage agent is the first to seventh embodiments. There is an advantage that only one place is required. As a result, there is an effect such as cost reduction by reducing the number of welds.

  The ninth embodiment relates to an end welding method. In the first to seventh embodiments, the capsule end portion is closed by applying a welding method when the base material of the regenerative heat capsule is a metal. At this time, the welding method may be a method such as TIG welding. However, in the manufacturing method in which, for example, aluminum is used for the capsule base material and the capsule end is closed by TIG welding, the following problems may occur. TIG welding is a method in which aluminum, which is a base material, is melted and welded. Therefore, the welded portion rises to a temperature equal to or higher than the melting point of aluminum, and fire due to welding is generated. And since a base material is melt | dissolved by welding, there exists a danger that the paraffin which is a cold storage thermal agent which became high temperature will ignite. Therefore, if the end of the capsule is closed with a brazing material or solder having a melting point equal to or lower than the melting point of the base material of the capsule, the possibility of flamming paraffin, which is a flammable regenerator, can be reduced. The capsule end closing after the paraffin injection is first mechanically closed by crimping or the like, and the portion is brazed or soldered to produce a cold storage capsule. If the capsule base material, such as TIG welding, is melted, there is a risk that even if TIG welding is performed after mechanical closure, the base material itself will melt and the internal cold storage material will come out. is there. Therefore, in the ninth embodiment, the end of the cold storage heat capsule is closed using solder or brazing material having a melting point lower than the melting point of the capsule base material.

  The tenth embodiment will be described. When soldering is performed in the ninth embodiment, solder that does not contain lead is required due to recent environmental problems. However, since Pb-free solder has poor wettability, it is necessary to use it after removing the oxide film on the surface of the base material such as flux. Therefore, after the soldering process, a process for cleaning the residual flux is also required, which increases the manufacturing cost. In order to eliminate this cleaning step, an ultrasonic soldering technique that can remove the surface oxide film of the capsule base material by a method other than flux is effective. This technique has been conventionally used as a technique for welding aluminum or the like. By using this technique when closing the end of the cold-storage capsule, the flux cleaning step can be omitted. In addition, since soldering is used, even if a metal such as aluminum is used as the base material of the capsule, it can be closed at a temperature lower than the melting point of the base material, so that there is no problem that the base material melts and paraffin comes out from the inside when soldering. Therefore, as a tenth embodiment, ultrasonic waves are applied to the base material and soldered when the end of the regenerator heat capsule is closed.

It is explanatory drawing of the 1st embodiment of this invention. It is explanatory drawing of the 2nd embodiment of this invention. It is explanatory drawing of the 3rd embodiment of this invention. It is explanatory drawing of the 5th embodiment of this invention. It is explanatory drawing of the 6th embodiment of this invention. It is explanatory drawing of the 7th embodiment of this invention. It is explanatory drawing of the 8th embodiment of this invention. It is explanatory drawing of an example of a cool storage heat | fever capsule shape. It is explanatory drawing of the system example of the vehicle air conditioner which uses a cool storage heat | fever.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Capsule original pipe | tube 2 A edge part 3 B edge part 4 Cold storage heat material 5 Cap 6 Single-end part 7 Syringe 8 Internal metal pipe 9 Cap-shaped coupling body 11 Strand 12 Roller 13 Roller 14 Extrusion die 15 Cold storage heat material 16 Movable type Cold storage heat material injection machine 17 Rotating roller crusher 18a Tubular body 18 Capsule tube 19 Mechanically sealed capsule end 20 Welded capsule end 21 Base material 22 Container 23 Cold storage thermal material 24 Closed part 31 Engine 32 Compressor 33 Condenser 34 Electric valve 35 Regenerator 36 Centrifugal electric pump 37 Three-way valve 38 Evaporator 39 Outside air or inside air 40 Cold air

Claims (10)

  After cutting the tubular tube and drawing both ends, after welding one end and closing the mouth, injecting cold storage heat agent from the opening at the other end, and then closing the end by caulking And the manufacturing method of the cool storage heat | fever capsule characterized by welding the edge part.   Cut the tubular tube, reduce the diameter of both ends by the amount corresponding to the inner shape and height of the cap having the same outer shape as the tube, join one end with the cap, and then inject the regenerative heat material And the other end is welded with another cap having the same outer shape as the tube, a method for producing a regenerative thermal capsule.   A cold storage heat capsule characterized by cutting a cylindrical tube and inserting a plurality of tubes having an outer diameter smaller than the inner diameter of the cylindrical tube and simultaneously injecting a cold storage heat material from the inside of the inserted tube Manufacturing method.   Cut the tubular tube, close one end of the tube by caulking, weld the end, and match the other end to the inner shape and height of the cap that has the same outer shape as the tube A method for producing a cold-storage capsule, wherein the cap is connected with a reduced diameter, and the cap is closed.   One end of the tube is closed by brazing or welding to a plate or cap-shaped connector corresponding to the closed portion of the end of the regenerative heat capsule consisting of a plurality of tubes, and the regenerative heat material is applied from the other end of the tube. A method for producing a regenerative heat capsule, characterized in that the other end of the pipe is closed by brazing or welding to a plate material or a cap-shaped connecting body corresponding to the closed portion of the end of the regenerative heat capsule.   The tube is manufactured while injecting cold storage heat at the same speed as the extrusion speed at which the tube is formed by extrusion. The tube is crushed from the outer surface of the tube, the end is mechanically closed and cut, and then the closed portion is welded A method for manufacturing a cold-storage capsule, characterized by:   Cold storage heat characterized by producing a tube while injecting a regenerative heat storage material at the same speed as the extrusion speed for forming the tube, compressing and closing the side of the tube, then cutting, and then welding the closed portion Capsule manufacturing method.   Capsule base material is made into a hollow container with one end in the longitudinal direction closed by extrusion, cold storage heat material is injected from the opening, and then the opening is closed by brazing or welding. A method for producing a cold-storage capsule, which is characterized.   In the manufacturing method of the capsule for regenerators of any one of Claims 1-7, the solder | pewter or brazing material which has melting | fusing point lower than melting | fusing point of a capsule base material is used for the closure of the edge part of a cool storage heat | fever capsule. The method for producing a cold-storage capsule is characterized by being closed.   10. The method for manufacturing a regenerative heat capsule according to claim 9, wherein when the end of the regenerative heat capsule is closed, an ultrasonic wave is applied to the base material and soldered.

Images