JP3820713B2 - Method for manufacturing adsorption core of adsorption refrigeration system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an adsorption core of an adsorption refrigeration apparatus that utilizes adsorption and desorption of a refrigerant such as water by cooling and heating an adsorbent.
[0002]
[Prior art]
The adsorption core of the adsorption refrigeration apparatus is generally cooled and heated by a heat exchange member having a tube through which a heating fluid or a cooling fluid (heat exchange fluid) flows and a surface of the heat exchange member. And a large number of particulate adsorbents that can adsorb and desorb the gaseous refrigerant.
[0003]
The applicant has previously proposed a method described in Japanese Patent Application No. 9-164655 as a method for manufacturing an adsorbent module used for an adsorption core or the like of such an adsorption refrigeration apparatus. This manufacturing method is shown in FIG.
The heat exchange member 80 includes header tanks 72 and 74, tubes 76, and heat transfer fins 78, and has a rectangular shape. The adsorbent 70, which is substantially saturated by adsorbing water into the pores, is filled from the one surface 81 side of the heat exchange member 80 (see FIG. 7A). Subsequently, after the adhesive solution P _{0 obtained} by diluting the adhesive with water is further filled in the heat exchange member 80 (see FIG. 7B), the adhesive core 90 is heated and bonded in the thermostatic bath 82, Finalize.
[0004]
As a result, the inflow of the adhesive solution P ₀ into the pores of the adsorbent 70 is prevented by the water existing in the pores in advance, and the presence of the adhesive into the pores of the adsorbent 70 is suppressed after heat bonding. An adsorbent module is obtained.
[0005]
[Problems to be solved by the invention]
However, in the above manufacturing method, adhesion of the adhesive to the pores inside the adsorbent 70 particles can be suppressed. However, since the adhesive solution P ₀ is poured after the adsorbent 70 is filled, the adhesive is composed of the adsorbent 70 particles. Adsorption and desorption performance is hindered because it is attached to and coated on the surface other than the adhesion site.
[0006]
Further, in order to prevent the above-mentioned problem, the present applicant applied the adhesive to the surface of the tube, fin, that is, the surface of the heat exchange member in advance to prevent the coating of the surface of the adsorbent particles of the adhesive. Attempts were made to fill the adsorbent. However, when the adsorbent is added, the adsorbent adheres to the tubes and fins near the surface layer of the heat exchange member (for example, the surface 81 side of the heat exchange member 80 in FIG. 7), causing clogging. It has been found that the problem of not being filled occurs.
[0007]
As a method of applying the adhesive to the member to which the adsorbent is to be bonded, there is a method described in JP-A-48-72088. This is because a flat fleece (fiber) layer to which the adsorbent is bonded is pre-applied with an adhesive and dried to leave a little stickiness, and then the adsorbent particles are sprayed and subjected to treatment such as pressure heating. And adhere.
However, this method uses a flat fleece (fiber) layer, and when applied to the manufacturing method of the adsorption core, there is a problem that the inside is not sufficiently filled due to the stickiness remaining in the adhesive. .
[0008]
The present invention has been made in view of the above points, and provides an adsorption core manufacturing method for an adsorption refrigeration apparatus that realizes an adsorption core excellent in adsorption / desorption performance while enabling good filling of an adsorbent. Objective.
[0009]
[Means for Solving the Problems]
In the method of applying the adhesive to the surface of the heat exchange member in advance, then pouring the adsorbent, and adhering the adsorbent to the surface portion of the heat exchange member, the applicant of the present invention, when pouring the adsorbent, We paid attention to temporarily removing the adhesive strength of the adhesive so that the adsorbent does not stick to the adhesive.
[0010]
That is, according to the first aspect of the present invention, in the manufacturing method for manufacturing the adsorption core (11, 12) of the adsorption refrigeration apparatus, the application step of applying the adhesive to the surface of the heat exchange member (30), and the bonding An adhesive force suppressing step for temporarily eliminating the adhesive force of the agent, a filling step for filling the heat exchange member (30) with the adsorbent (50) in a state where the adhesive force of the adhesive is temporarily lost, and an adhesive agent And an adhering step of adhering the adsorbent (50) to the surface of the heat exchange member (30).
[0011]
Thereby, the adsorbent (50) is filled into the heat exchange member (30) in a state where the adhesive force of the adhesive is temporarily lost in the filling step, so that the adsorbent (50) is applied to the surface of the heat exchange member (30). Clogging at the surface layer of the heat exchange member (30) can be prevented without being bonded, and the heat exchange member (30) can be satisfactorily filled.
Further, after the adsorbent (50) is filled, the adhesive strength of the adhesive is restored and the adsorbent (50) is adhered to the surface of the heat exchange member (30). Both can be bonded by interposing only with the adsorbent (50), and the adhesive does not adhere to the surface other than the adhering portion of the adsorbent particles, and can exhibit good adsorption / desorption performance.
[0012]
Therefore, it is possible to provide a method for manufacturing an adsorption core of an adsorption refrigeration apparatus that realizes an adsorption core excellent in adsorption / desorption performance while allowing good filling of the adsorbent.
Here, the manufacturing method according to claim 1 can be performed as in the inventions according to claim 2 and claim 3.
That is, the invention according to claim 2 is characterized in that, in the adhesive force suppressing step, the applied adhesive is dried to temporarily lose the adhesive force, and in the adhesive step, the adhesive that temporarily lost the adhesive force is removed. Wetting with a solvent activates the adhesive and restores the adhesive strength.
[0013]
Further, in the invention described in claim 3, in the application step, the adhesive is applied to the surface of the heat exchange member (30) as an adhesive solution diluted with water, and the applied adhesive solution is frozen in the adhesive force suppression step. The adhesive strength is temporarily lost, and in the bonding step, the frozen adhesive solution is thawed to activate the adhesive and restore the adhesive strength.
[0014]
According to the invention of claim 4, in the manufacturing method for manufacturing the adsorption core (11, 12) of the adsorption refrigeration apparatus, the film (F) made of the adhesive in a state where the adhesive force is temporarily lost. Adhesion by restoring the adhesive force of the affixed film (F) and the film affixing step of coating the surface of the heat exchange member (30), the filling step of filling the adsorbent (50) in the heat exchange member (30) A bonding step of bonding the agent (50) to the surface of the heat exchange member (30).
[0015]
In the present invention, the film pasting step also serves as the coating step and the adhesive force suppression step according to claim 1, and the method for producing the adsorption core of the adsorption refrigeration apparatus having the same effect as the production method according to claim 1. Can be provided.
Here, as said film (F), the film which consists of a thermosetting adhesive which stopped reaction at the B stage can be used.
[0016]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment description later mentioned.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments shown in the drawings will be described below.
(First embodiment)
In the present embodiment, the present invention is described as being applied to the first and second adsorption cores 11 and 12 of the adsorption refrigeration apparatus 1 as shown in FIG. These adsorption cores 11 and 12 are accommodated in sealed containers 14 and 15, respectively, and the sealed containers 14 and 15 are provided with inlet / outlet portions 16 and 17 for a gaseous refrigerant (in this embodiment, water vapor).
[0018]
These inlet / outlet portions 16 and 17 are connected to three-way switching valves 18 and 19. Between the three-way switching valves 18 and 19, a condenser 20 for liquefying the refrigerant, gas-liquid separation of the refrigerant, and liquid refrigerant A receiver 21 that performs temporary storage, a pump 22 that sends liquid refrigerant, and an evaporator 23 that vaporizes the liquid refrigerant and exchanges heat with the outside air are connected in series to form a refrigerant circuit 25. In the refrigerant circuit 25, a required amount of refrigerant (adsorbing substance), for example, water is enclosed in this embodiment.
[0019]
Next, the structure of the adsorption cores 11 and 12 will be described in detail with reference to FIG. The adsorption cores 11 and 12 are constituted by a heat exchanger (heat exchange member) 30 and a large number of particulate adsorbents 50 bonded to the surface of the heat exchanger 30. 2A is a perspective view illustrating the entire configuration of the adsorption cores 11 and 12, and FIG. 2B is a schematic diagram illustrating an adhesion state between the heat exchanger 30 and the particles K of the adsorbent 50. FIG.
[0020]
The heat exchanger 30 includes header tanks 31 and 32 at both ends, and a plurality of plate-like tubes 33 through which heat exchange fluid flows are arranged in parallel at a predetermined distance between the header tanks 31 and 32. ing. Corrugated fins (heat transfer fins) 34 are fixed between the tubes 33 by brazing, welding, or adhesion. In the present embodiment, the fin arrangement interval L of the fins 34 is about 1.6 mm (about 3.2 mm for the fin pitch 2L).
[0021]
The header tanks 31 and 32 are made of a material excellent in moldability, for example, resin, aluminum, copper, etc., and the tubes 33 and the fins 34 are made of a material excellent in heat conduction, for example, aluminum or copper.
Then, in order of the header tank 31 on the inlet side, the tube 33, and the header tank 31 on the outlet side, a cooling fluid (for example, a relatively low temperature fluid from the outdoor heat exchanger, a heat exchange fluid in the claims) or a heating fluid (for example, Engine cooling water, a heat exchange fluid as defined in the claims) flows.
[0022]
A large number of particulate adsorbents 50 are filled in gaps formed by the tubes 33 and the fins 34. As shown in FIG. 2 (b), each particle of the adsorbent 50 is adhered and fixed to only the surfaces of the tube 33 and the fin 34 (parts indicated by black circles in the figure) with an adhesive, and each particle other than the part to be attached. There is no adhesive on the surface.
As is well known, the adsorbent 50 adsorbs an adsorbing substance (for example, water vapor, an alcohol aqueous solution, or a chlorofluorocarbon refrigerant) with a high capacity in a cooled state, and the adsorbing capacity gradually decreases with the adsorption of the adsorbing substance. By being in a heated state, it has the property of desorbing the adsorbed substance adsorbed and regenerating the adsorption capacity.
[0023]
Therefore, the adsorbent 50 performs heat exchange with the heat exchange fluid flowing through the tube 33 by heat conduction through the tube 33 and the fin 34, and adsorbs the gaseous refrigerant (water vapor in the present embodiment) by being cooled, The gaseous refrigerant can be desorbed by being heated.
In such a configuration, the first and second adsorption cores 11 and 12 are controlled by a control device such as a microcomputer (not shown) so that when one is on the desorption side for desorbing the gaseous refrigerant (water vapor), the other is the evaporator. It is comprised so that it can switch alternately so that it may become the adsorption | suction side which adsorb | sucks the gaseous refrigerant from 23.
[0024]
Specifically, in FIG. 1, when the first adsorption core 11 is used as the desorption side and the second adsorption core 12 is used as the adsorption side, the three-way switching valves 18 and 19 are set to the solid line position in FIG. The inlet / outlet part 16 and the condenser 20 of the closed container 14 on the 11th side are in communication with each other, and the inlet / outlet part 17 of the closed container 15 on the adsorption core 12 side and the evaporator 23 are in communication. Moreover, a heating fluid is supplied to the adsorption core 11 side, and a cooling fluid is supplied to the adsorption core 12 side.
[0025]
Further, when the first adsorption core 11 is used as the adsorption side and the second adsorption core 12 is used as the desorption side, the three-way switching valves 18 and 19 are set to the dotted line positions in FIG. The inlet / outlet part 16 and the evaporator 23 are in communication with each other, and the inlet / outlet part 17 of the sealed container 15 on the adsorption core 12 side and the condenser 20 are in communication with each other. Further, a cooling fluid is supplied to the adsorption core 11 side, and a heating fluid is supplied to the adsorption core 12 side.
[0026]
Next, a method for manufacturing the adsorption core of the adsorption refrigeration apparatus will be described. FIG. 3 is a process diagram (flow chart) of the manufacturing method of the present embodiment, and FIG. 4 is an explanatory diagram for explaining the manufacturing method of the present embodiment. In this embodiment, the adsorbent 50 is bonded and filled in the heat exchanger 30 using a thermoplastic adhesive.
The adsorbent 50 has a particle size of about ½ of the arrangement interval L of the fins 34 (about ¼ of the fin pitch 2L). Thereby, the adsorbent 50 always comes into contact with the fins 34. Further, a heat exchanger 30 in which the header tanks 31 and 32, the tubes 33 and the fins 34 are assembled is prepared by brazing, welding, adhesion, or the like.
[0027]
First, in the application step S1, an adhesive is applied to the surface of the heat exchanger 30. An adhesive solution R0 obtained by diluting (for example, 50% solution) a thermoplastic adhesive (for example, nylon or polyester) with an organic solvent (for example, methyl ethyl ketone, alcohol or the like) is used as the heat exchanger 30, that is, the tube 33 and the fin 34. Is uniformly applied to the surface (see FIG. 4A). At this time, a thin film is formed on the surfaces of the tubes 33 and the fins 34 by air blow or the like so that the adhesive does not accumulate in the gaps between the fins 34.
[0028]
Next, in the adhesive force deterrent step S2, the applied adhesive is dried to remove the solvent and temporarily eliminate the adhesive force. For example, it is dried at room temperature for about 10 minutes to eliminate the adhesive force (viscosity) of the adhesive.
Subsequently, in the filling step S3, in the heat exchanger 30, the surface on the side opposite to the surface on the inlet side through which the adsorbent 50 is poured is closed with a plate member (not shown) or the like. Then, with the adhesive force of the adhesive temporarily lost, the adsorbent 50 is filled into the gaps between the fins 34 of the heat exchanger 30 so as to flow from the one surface 30a side (see FIG. 4B).
[0029]
At this time, since there is no adhesive force (viscosity) in the adhesive, the adsorbent 50 smoothly enters and fills in the vicinity of the one surface 30a of the heat exchanger 30 without adhering to the tube 33 and the fin 34. it can.
Next, in the bonding step S4, an organic solvent R1 (same as the solvent that made the bonding solution R0) R1 that allows the surface of the adhesive that has temporarily lost the bonding force to be wetted is poured to activate the adhesive and increase the bonding strength. Restored (see FIG. 4C). Then, for example, it is heated at 150 ° C. for about 5 minutes to be completely bonded. Thus, the adsorption cores 11 and 12 in which the adsorbent 50 is bonded only on the surface of the heat exchanger 30 are completed.
[0030]
Thus, in this embodiment, since it fills in the said filling process S3 in the state which lost the adhesive force temporarily, it adsorb | sucks to the inlet side (near one surface 30a) into which the adsorbent 50 is poured in the heat exchanger 30. The agent 50 will not adhere and become clogged.
Further, the adsorbent 50 is adhered only on the surface of the heat exchanger 30, and the surface area of each particle can be effectively utilized without any adhesive remaining on the surface other than the adhesion site in each particle of the adhesive 50. Since sufficient water can be adsorbed and desorbed, sufficient adsorption and desorption performance can be obtained.
[0031]
Further, since the adsorbent 50 having a particle diameter of about ½ of the arrangement interval L of the fins 34 is used, the adsorbent 50 is always in contact with the fins 34 as shown in FIG. In addition, the gap between the tube 33 and the fin 34 is filled evenly, and heat transfer between the adsorbent 50 and the heat exchanger 30 can be improved.
Further, as shown in FIG. 2 (b), since the adsorbent 50 always comes into contact with the fins 34, the adsorbent 50 has a shape in which each particle supports each other even at a portion other than the adhesion site, and the adsorbent 50 is supplied to the heat exchanger 30. The degree of fixation of the adsorbent 50 is further improved.
[0032]
(Second Embodiment)
In the first embodiment, the adhesive is dissolved in an organic solvent as the adhesive solution R0 in the coating step S1, but the second embodiment provides a manufacturing method using an adhesive that uses water as the solvent. . Hereinafter, with reference to the process diagram of FIG. 3, portions different from those of the first embodiment in each of the steps S <b> 1 to S <b> 4 will be described.
[0033]
First, in the application step S1, an adhesive solution R0 obtained by diluting an adhesive (for example, vinyl acetate) with water (for example, a 10% aqueous solution) is uniformly applied to the surface of the heat exchanger 30 (see FIG. 4A). . Similar to the first embodiment, a thin film is formed on the surface of the heat exchanger 30 by air blow or the like.
Next, in the adhesive force suppression step S2, the heat exchanger 30 to which the adhesive solution R0 is applied is frozen at, for example, 0 ° C. or less for about 1 hour, so that the adhesive solution R0 is frozen and the adhesive force (viscosity) is temporarily increased. Eliminate. In the case of an adhesive that uses water as a solvent, the adhesive strength is not restored when the solvent is removed by drying, as in the first embodiment, so that the method of freezing is used.
[0034]
Subsequently, in the filling step S3, the adsorbent 50 is filled into the heat exchanger 30 in the same manner as described above (see FIG. 4B). At this time, since the adhesive does not have an adhesive force (viscosity), the adsorbent 50 can be smoothly filled to the back of the heat exchanger 30 without being clogged and sufficiently filled.
Next, in the bonding step S4, the heat exchanger 30 and the adsorbent 50 used in the filling step S3 are heated at, for example, 70 ° C. for 30 minutes to thaw the frozen adhesive solution to activate the adhesive. Revive the adhesive strength. Then, for example, the film is completely bonded by heating at 90 ° C. for about 1 hour. Thus, the adsorption cores 11 and 12 in which the adsorbent 50 is bonded only on the surface of the heat exchanger 30 are completed.
[0035]
The adsorption cores 11 and 12 manufactured in the present embodiment also have the same effects as those manufactured in the first embodiment.
(Third embodiment)
In the third embodiment, the coating step S1 and the adhesive force suppression step S2 in the first and second embodiments are simultaneously performed by a step of coating the fin 34 with a thermoplastic film in advance (film pasting step). . FIG. 5 is a process diagram (flow chart) of the manufacturing method of the present embodiment, and FIG. 6 is an explanatory diagram for explaining the manufacturing method of the present embodiment. Hereinafter, parts different from the above embodiments will be mainly described.
[0036]
First, in the film sticking step S5, the heat exchanger 30 without the fins 34, that is, the member 300 in which the header tanks 31, 32 and the tube 33 are assembled by brazing, welding, bonding, or the like is prepared. On the other hand, a film F made of an adhesive that temporarily loses the adhesive force is coated on the surface of the fin 34 by pressure bonding in advance (see FIG. 6A).
[0037]
Here, as the film F, for example, a film made of a thermoplastic adhesive such as nylon or polyester, or a film cured with a B stage in a thermosetting adhesive such as an epoxy (semi-cure type) Can be used.
Next, in the filling step S3, as in the first and second embodiments, the adsorbent 50 is filled into the heat exchanger 30 (see FIG. 6B). At this time, since there is no adhesive force (viscosity) in the film F, the adsorbent 50 can be smoothly filled to the back of the heat exchanger 30 without being clogged and sufficiently filled.
[0038]
Subsequently, in the bonding step S <b> 4, the adhesive force of the attached film F is restored and the adsorbent 50 is bonded to the surface of the fin 34. Here, in both cases, the film made of the thermoplastic adhesive and the film using the thermosetting adhesive are heated to adhere the adsorbent 50. At this time, due to the adhesive force of the film F, the fin 34 and the tube 33 can be bonded simultaneously.
[0039]
In this way, the adsorption cores 11 and 12 in which the adsorbent 50 is adhered only on the surface of the fin 34 are completed. The adsorption cores 11 and 12 manufactured in the present embodiment also have the same effects as those manufactured in the first and second embodiments.
(Other embodiments)
In each of the above embodiments, the fin 34 is a corrugated fin, but the fin shape is not limited to this. For example, it may be a plate fin.
[0040]
The heat exchanger 30 may be a tube-only type without fins instead of a tube-fin type. In that case, a plurality of tubes are arranged at a predetermined interval, and the arrangement gap is filled with an adsorbent, or one tube is arranged U-turns a plurality of times at a predetermined interval, and the arrangement gap is It can be made to be filled with an adsorbent.
[0041]
In any case, if the particle size of the adsorbent is about ½ of the fin or plate arrangement interval, each particle of the adsorbent is always in contact with the fin or plate, and each particle is also in contact with each other. The above-mentioned good heat transfer and improvement of the fixing degree can be achieved.
As described above, the present invention can be summarized as an adsorption refrigeration apparatus including a heat exchange member having a tube through which a heat exchange fluid flows and a large number of particulate adsorbents bonded to the surface of the heat exchange member. In the manufacturing method of the adsorption core, after the adhesive is applied to the surface of the heat exchange member and the adhesive force of the adhesive is temporarily lost, the adsorbent is filled in the heat exchange member, and then the adhesive strength of the adhesive The adsorption core of the adsorption refrigeration apparatus in which the adsorbent is adhered to the surface of the heat exchange member by reviving the above is provided.
[Brief description of the drawings]
FIG. 1 is a schematic overall configuration diagram of an adsorption refrigeration apparatus.
2A is a perspective view of an adsorption core of an adsorption refrigeration apparatus according to the present invention, and FIG. 2B is a schematic diagram showing an adhesion state between a heat exchanger and adsorbent particles.
FIG. 3 is a process diagram of a manufacturing method according to first and second embodiments of the present invention.
FIG. 4 is an explanatory view explaining the manufacturing method of the first and second embodiments.
FIG. 5 is a process diagram of a manufacturing method according to a third embodiment of the present invention.
FIG. 6 is an explanatory diagram for explaining the manufacturing method of the third embodiment.
FIG. 7 is an explanatory view showing a method for manufacturing an adsorption core of the adsorption refrigeration apparatus of the prior application.
[Explanation of symbols]
11, 12 ... Adsorption core, 30 ... Heat exchanger, 33 ... Tube, 50 ... Adsorbent,
F ... Film.

Claims (5)

A heat exchange member (30) having a tube (33) through which a heat exchange fluid flows, and a gas refrigerant adsorbed and desorbed by being bonded to the surface of the heat exchange member (30) and being cooled and heated by the heat exchange fluid. A production method for producing an adsorption core (11, 12) of an adsorption refrigeration apparatus comprising a plurality of particulate adsorbents (50),
An application step of applying an adhesive to the surface of the heat exchange member (30);
An adhesive force suppressing step of temporarily eliminating the adhesive force of the adhesive;
A filling step of filling the heat exchange member (30) with the adsorbent (50) in a state where the adhesive force of the adhesive is temporarily lost;
A method for producing an adsorption core of an adsorption refrigeration apparatus, comprising: an adhesion step of restoring the adhesive force of the adhesive and adhering the adsorbent (50) to the surface of the heat exchange member (30). In the adhesive force suppression step, the applied adhesive is dried to temporarily remove the adhesive force,
2. The adsorption refrigeration apparatus according to claim 1, wherein, in the bonding step, the adhesive that has temporarily lost the adhesive force is wetted with a solvent to activate the adhesive and restore the adhesive force. Manufacturing method of adsorption core. In the application step, the adhesive is applied to the surface of the heat exchange member (30) as an adhesive solution diluted with water,
In the adhesive force suppression step, the adhesive force is temporarily lost by freezing the applied adhesive solution,
2. The method of manufacturing an adsorption core of an adsorption refrigeration apparatus according to claim 1, wherein, in the adhesion step, the adhesive is activated by thawing the frozen adhesion solution to restore the adhesive force. 3. A heat exchange member (30) having a tube (33) through which a heat exchange fluid flows, and a gas refrigerant adsorbed and desorbed by being bonded to the surface of the heat exchange member (30) and being cooled and heated by the heat exchange fluid. A production method for producing an adsorption core (11, 12) of an adsorption refrigeration apparatus comprising a plurality of particulate adsorbents (50),
A film application step of coating the surface of the heat exchange member (30) with a film (F) made of an adhesive in a state where the adhesive force is temporarily lost;
A filling step of filling the adsorbent (50) into the heat exchange member (30);
Adsorption of the adsorption refrigeration apparatus comprising: an adhesion step of restoring the adhesive force of the attached film (F) to adhere the adsorbent (50) to the surface of the heat exchange member (30) Core manufacturing method. The method for producing an adsorption core of an adsorption refrigeration apparatus according to claim 4, wherein a film made of a thermosetting adhesive whose reaction is stopped at a B stage is used as the film (F).

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