JP2019086236A - Refrigerator desiccant and dryer - Google Patents
Refrigerator desiccant and dryer Download PDFInfo
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- JP2019086236A JP2019086236A JP2017215604A JP2017215604A JP2019086236A JP 2019086236 A JP2019086236 A JP 2019086236A JP 2017215604 A JP2017215604 A JP 2017215604A JP 2017215604 A JP2017215604 A JP 2017215604A JP 2019086236 A JP2019086236 A JP 2019086236A
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本発明は、冷凍サイクルシステムの冷媒中の水分を吸着する冷媒用乾燥剤及びその乾燥剤を含むドライヤに関し、特に、車両用の冷凍サイクルシステムの冷媒中の水分を吸着する冷媒用乾燥剤及びその乾燥剤を含むドライヤに関する。 The present invention relates to a desiccant for a refrigerant that adsorbs water in a refrigerant of a refrigeration cycle system and a dryer including the desiccant, and more particularly to a desiccant for a refrigerant that adsorbs water in a refrigerant of a refrigeration cycle system for a vehicle The present invention relates to a dryer containing a desiccant.
冷凍サイクルシステムは、コンプレッサー、コンデンサ、膨張弁およびエバポレータを中空管で連結して構成される。冷凍サイクルシステム中に水分が含まれていると、膨張弁の細孔で凍結して冷媒の流れを阻害する、または冷凍装置の機能部品を腐食させるおそれがある。このため、多くの冷凍サイクルシステム中には、袋体に冷媒用乾燥剤を充填したドライヤを、レシーバータンクあるいはヘッダタンクと呼ばれる金属容器等の中に配置し、冷媒中の水分を吸着除去している（例えば、特許文献１〜５参照）。冷媒用乾燥剤として、主に、冷媒を吸着せず水分のみを吸着できる合成ゼオライト、アルミナゲル、シリカゲル等が用いられている。 The refrigeration cycle system is configured by connecting a compressor, a condenser, an expansion valve, and an evaporator by hollow tubes. If water is contained in the refrigeration cycle system, it may freeze at the pores of the expansion valve to inhibit the flow of the refrigerant or corrode functional parts of the refrigeration system. For this reason, in many refrigeration cycle systems, a dryer in which a bag body is filled with a desiccant for refrigerant is disposed in a metal container or the like called a receiver tank or a header tank to adsorb and remove moisture in the refrigerant. (For example, refer patent documents 1-5). As the desiccant for the refrigerant, synthetic zeolite, alumina gel, silica gel or the like which can adsorb only water without adsorbing the refrigerant is mainly used.
しかしながら、袋体に冷媒用乾燥剤を充填したドライヤの場合、周囲の機器等により発生する振動等によって冷媒用乾燥剤同士が擦れ合って冷媒用乾燥剤が摩耗し、これにより発生した粉塵が袋体の通気性や通液性を悪くしたり、または、袋体から漏れ出してコンプレッサーの摺動面を損傷したり、膨張弁の細孔を閉塞させたりする恐れがある。そこで、本発明は、耐摩耗性を改善した冷媒用乾燥剤及びその冷媒用乾燥剤を含むドライヤを提供することを目的とする。 However, in the case of the dryer in which the bag body is filled with the refrigerant desiccant, the refrigerant desiccant rubs against each other due to vibration or the like generated by the surrounding equipment, etc., and the refrigerant desiccant wears. There is a risk of deteriorating the air permeability and liquid permeability of the body, or of leaking from the bag body to damage the sliding surface of the compressor, or block the pores of the expansion valve. Then, this invention aims at providing the dryer containing the desiccant for refrigerant | coolants which improved abrasion resistance, and the desiccant for refrigerant | coolant for the refrigerant | coolant.
袋体に冷媒用乾燥剤を充填したドライヤが使用される前は、冷凍サイクルシステムの冷媒液溜め容器内に冷媒用乾燥剤をそのまま充填していた。このため、冷媒用乾燥剤を充填するときに生ずる圧縮応力によって冷媒用乾燥剤が割れてしまうことを防ぐために、冷媒用乾燥剤に対して一定以上の機械的強度を要求していた。そして、袋体に冷媒用乾燥剤を充填して冷媒用乾燥剤を使用する場合も、冷凍サイクルシステムの冷媒液溜め容器内に冷媒用乾燥剤をそのまま充填していたときに要求されていた機械的強度を満たす冷媒用乾燥剤を使用していた。しかし、本発明者らは上記従来の課題を解決すべく鋭意検討した結果、袋体に冷媒用乾燥剤を充填したドライヤに冷媒用乾燥剤を使用する場合、粒度とその範囲をコントロールすることによって、冷凍サイクルシステムの冷媒液溜め容器内に冷媒用乾燥剤をそのまま充填していたときに要求されていたレベルまでは、冷媒用乾燥剤の機械的強度を向上させる必要がないことを見出した。さらに、過剰であった機械的強度を最適量の機械的強度にすることによって、冷媒用乾燥剤の耐摩耗性をさらに改善できることを見出し、本発明を完成させた。 Before the dryer in which the bag body is filled with the refrigerant desiccant is used, the refrigerant desiccant is filled in the refrigerant liquid storage container of the refrigeration cycle system as it is. For this reason, in order to prevent the refrigerant desiccant from cracking due to compression stress generated when the refrigerant desiccant is filled, the refrigerant desiccant is required to have a mechanical strength of a certain level or more. And, even when the bag body is filled with the refrigerant desiccant and the refrigerant desiccant is used, the machine is required when the refrigerant desiccant is filled in the refrigerant liquid storage container of the refrigeration cycle system as it is. Used a refrigerant desiccant that meets the target strength. However, as a result of intensive studies to solve the above-mentioned conventional problems, the present inventors control the particle size and the range thereof when using the desiccant for refrigerant in the dryer in which the bag body is filled with the desiccant for refrigerant. It has been found that it is not necessary to improve the mechanical strength of the desiccant for refrigerant to the level required when the refrigerant desiccant for the refrigerant cycle was filled as it was in the refrigerant liquid storage container of the refrigeration cycle system. Furthermore, the inventors found that the abrasion resistance of the refrigerant desiccant can be further improved by making the mechanical strength that is excessive into an optimal amount of mechanical strength, and completed the present invention.
本発明は、下記［１］〜［９］を要旨とする。
［１］冷凍サイクルシステムの冷媒中の水分を吸着する粒状の冷媒用乾燥剤であって、平均粒径が０．６〜２．５ｍｍであり、粒径の範囲が０．５５ｍｍ以下である冷媒用乾燥剤。
［２］粒径の範囲が０．４０ｍｍ以下である上記［１］に記載の冷媒用乾燥剤。
［３］平均粒径が０．６〜２．３ｍｍである上記［１］または［２］に記載の冷媒用乾燥剤。
［４］粒径の範囲が０．１０ｍｍ以上である上記［１］〜［３］のいずれか１つに記載の冷媒用乾燥剤。
［５］平均粒径が０．７〜２．２ｍｍであり、粒径の範囲が０．２５〜０．５１ｍｍである上記［１］に記載の冷媒用乾燥剤。
［６］合成ゼオライトの造粒物である上記［１］〜［５］のいずれか１つに記載の冷媒用乾燥剤。
［７］合成ゼオライトが、３Ａ型合成ゼオライトまたは４Ａ型合成ゼオライトである上記［６］に記載の冷媒用乾燥剤
［８］冷凍サイクルシステムが車両用の冷凍サイクルシステムである上記１〜７のいずれか１項に記載の冷媒用乾燥剤。
［９］上記［１］〜［８］のいずれか１つに記載の冷媒用乾燥剤と、冷媒用乾燥剤を収容する袋体とを含むドライヤ。
This indication makes the following [1]-[9] a summary.
[1] A granular desiccant for a refrigerant which adsorbs moisture in the refrigerant of a refrigeration cycle system, the refrigerant having an average particle diameter of 0.6 to 2.5 mm and a particle diameter range of 0.55 mm or less For desiccant.
[2] The desiccant for refrigerant according to the above [1], wherein the range of the particle size is 0.40 mm or less.
[3] The desiccant for refrigerant | coolant as described in said [1] or [2] whose average particle diameter is 0.6-2.3 mm.
[4] The desiccant for a refrigerant according to any one of the above [1] to [3], wherein the range of the particle size is 0.10 mm or more.
[5] The desiccant for a refrigerant according to the above [1], which has an average particle diameter of 0.7 to 2.2 mm and a particle diameter range of 0.25 to 0.51 mm.
[6] The desiccant for a refrigerant according to any one of the above [1] to [5], which is a granulated product of synthetic zeolite.
[7] The desiccant for refrigerant according to the above [6], wherein the synthetic zeolite is 3A type synthetic zeolite or 4A type synthetic zeolite [8] any one of the above 1 to 7 wherein the refrigeration cycle system is a refrigeration cycle system for vehicles The desiccant for refrigerant | coolant of any one of-.
[9] A dryer comprising the refrigerant desiccant according to any one of the above [1] to [8], and a bag containing the refrigerant desiccant.
本発明によれば、耐摩耗性を改善した冷媒用乾燥剤及びその冷媒用乾燥剤を含むドライヤを提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the dryer containing the desiccant for refrigerant | coolants which improved abrasion resistance, and the desiccant for refrigerant | coolant can be provided.
［冷媒用乾燥剤］
本発明は、冷凍サイクルシステムの冷媒中の水分を吸着する粒状の冷媒用乾燥剤であって、平均粒径が０．６〜２．５ｍｍであり、粒径の範囲が０．４ｍｍ以下である。以下、本発明の冷媒用乾燥剤を詳細に説明する。
（冷凍サイクルシステム）
本発明の冷媒用乾燥剤は、冷凍サイクルシステムの冷媒中の水分を吸着するものである。上述したように冷凍サイクルシステムは、例えば、コンプレッサー、コンデンサ、膨張弁及びエバポレータを中空管で連結して構成され、蒸発、圧縮、凝縮及び膨張の一連の工程を行う。冷凍サイクルシステムには、例えば、冷媒液を一時貯蔵するレシーバータンクあるいはヘッダタンクと呼ばれる金属容器が設けられる。その中に、本発明の冷媒用乾燥剤を袋体に充填して作製されたドライヤを配置することにより、本発明の冷媒用乾燥剤が冷媒中の水分を吸着し、冷媒から水分が除去される。また、中空管の途中にレシーバタンクを設けることによって、本発明の冷媒用乾燥剤に冷媒中の水分を吸着させるようにしてもよい。
[Drier for refrigerant]
The present invention is a particulate refrigerant desiccant for adsorbing moisture in refrigerant in a refrigeration cycle system, having an average particle diameter of 0.6 to 2.5 mm and a particle diameter range of 0.4 mm or less . Hereinafter, the desiccant for refrigerant | coolant of this invention is demonstrated in detail.
(Refrigeration cycle system)
The desiccant for refrigerant | coolant of this invention adsorb | sucks the water | moisture content in the refrigerant | coolant of a refrigerating cycle system. As described above, the refrigeration cycle system is configured, for example, by connecting a compressor, a condenser, an expansion valve, and an evaporator by hollow tubes, and performs a series of steps of evaporation, compression, condensation, and expansion. The refrigeration cycle system is provided with, for example, a metal container called a receiver tank or a header tank for temporarily storing the refrigerant liquid. The desiccant for refrigerant of the present invention adsorbs the moisture in the refrigerant, and the moisture is removed from the refrigerant by disposing the drier manufactured by filling the desiccant for refrigerant of the present invention in the bag. Ru. Further, by providing a receiver tank in the middle of the hollow tube, the refrigerant desiccant of the present invention may be made to adsorb the moisture in the refrigerant.
本発明の冷媒用乾燥剤は、耐摩耗性が良好であるので、振動が起こりやすい用途に対して、より好適に用いられる。例えば、本発明の冷媒用乾燥剤は、車両用の冷凍サイクルシステムに特に好適に用いることができる。車両用の冷凍サイクルシステムでは、車両自体の振動も冷媒用乾燥剤に加わるので、車両用の冷凍サイクルシステムに用いる冷媒用乾燥剤には優れた耐摩耗性が要求される。このため、耐摩耗性に優れた本発明の冷媒用乾燥剤は、冷凍サイクルシステムの用途の中でも、特に車両用の冷凍サイクルシステムの用途に好適である。 Since the refrigerant desiccant of the present invention has good abrasion resistance, it is more suitably used for applications in which vibration tends to occur. For example, the refrigerant desiccant of the present invention can be particularly suitably used in a refrigeration cycle system for vehicles. In a vehicle refrigeration cycle system, vibration of the vehicle itself is also added to the refrigerant desiccant, so that the refrigerant desiccant used in the vehicle refrigeration cycle system is required to have excellent wear resistance. For this reason, the desiccant for refrigerant | coolant of this invention excellent in abrasion resistance is suitable for the use of the refrigerating cycle system especially for vehicles among the uses of a refrigerating cycle system.
（形状）
本発明の冷媒用乾燥剤は、粒状の乾燥剤である。本発明の冷媒用乾燥剤は、例えば転動造粒法によって作製される。具体的には、例えば次のようにして本発明の冷媒用乾燥剤を作製することができる。原料に水及びバインダを加えた後、混練機を用いて混練し、転動式造粒機に投入して、球形化する。その後、得られた球形物を乾燥し、焼成して、本発明の冷媒用乾燥剤が得られる。
(shape)
The desiccant for refrigerant | coolant of this invention is a granular desiccant. The desiccant for refrigerant | coolant of this invention is produced by the rolling granulation method, for example. Specifically, for example, the refrigerant desiccant of the present invention can be produced as follows. After water and a binder are added to the raw material, the mixture is kneaded using a kneader, charged into a rolling granulator, and made into a sphere. Thereafter, the obtained spheres are dried and fired to obtain the refrigerant desiccant of the present invention.
（平均粒径）
本発明の冷媒用乾燥剤の平均粒径は、０．６〜２．５ｍｍであり、好ましくは０．６〜２．３ｍｍであり、より好ましくは０．７〜２．２ｍｍである。冷媒用乾燥剤の平均粒径が０．６ｍｍ未満であると、冷媒用乾燥剤の製造の際、冷媒用乾燥剤に付着するダスト（粉塵）が増え、冷媒用乾燥剤を充填するときに発生するダスト量が多くなる。また、冷媒用乾燥剤の平均粒径が０．６ｍｍ未満であると、冷媒用乾燥剤の機械的強度が低くなりすぎてしまう。さらに、冷媒用乾燥剤の平均粒径が０．６ｍｍ未満であると、静電気の影響を受け、冷媒用乾燥剤を収容する袋体の袋とじ部分における冷媒用乾燥剤の噛み込みが多くなる。なお、冷媒用乾燥剤を収容する袋体の袋とじ部分における冷媒用乾燥剤の噛み込みを避けるために充填速度を遅くすると、冷媒用乾燥剤の吸着水分量が増え、冷媒用乾燥剤の有効水分吸着能力が低下し、冷媒用乾燥剤を袋体に収容して作製したドライヤの水分除去効果が小さくなる。また、冷媒用乾燥剤の平均粒径が０．６ｍｍ未満であると、冷媒用乾燥剤を収容する袋体として不織布を用いた場合、不織布の隙間から冷媒用乾燥剤が漏れ出る場合がある。一方、冷媒用乾燥剤の平均粒径が２．５ｍｍよりも大きいと、冷媒用乾燥剤の耐摩耗性が悪くなる。
(Average particle size)
The average particle diameter of the desiccant for refrigerant | coolant of this invention is 0.6-2.5 mm, Preferably it is 0.6-2.3 mm, More preferably, it is 0.7-2.2 mm. When the average particle size of the desiccant for refrigerant is less than 0.6 mm, dust (dust) attached to the desiccant for refrigerant increases during the production of the refrigerant desiccant, and it occurs when the refrigerant desiccant is filled Amount of dust to be In addition, when the average particle size of the refrigerant desiccant is less than 0.6 mm, the mechanical strength of the refrigerant desiccant becomes too low. Furthermore, when the average particle diameter of the refrigerant desiccant is less than 0.6 mm, the refrigerant desiccant is affected by static electricity, and biting of the refrigerant desiccant in the bag portion of the bag containing the refrigerant desiccant increases. In addition, if the filling speed is reduced to avoid the biting of the refrigerant desiccant in the bag binding portion of the bag containing the refrigerant desiccant, the amount of adsorbed water of the refrigerant desiccant increases, and the effectiveness of the refrigerant desiccant is increased. The water adsorption capacity decreases, and the water removal effect of the dryer manufactured by storing the refrigerant desiccant in the bag decreases. When the average particle diameter of the refrigerant desiccant is less than 0.6 mm, when the nonwoven fabric is used as a bag containing the refrigerant desiccant, the refrigerant desiccant may leak from the gap of the nonwoven fabric. On the other hand, when the average particle diameter of the refrigerant desiccant is larger than 2.5 mm, the abrasion resistance of the refrigerant desiccant is deteriorated.
なお、冷凍サイクルシステムの冷媒液溜め容器内に冷媒用乾燥剤をそのまま充填する場合は、冷媒用乾燥剤を充填するときに生ずる圧縮応力によって冷媒用乾燥剤が割れてしまうことを防ぐための機械的強度を確保するために、冷媒用乾燥剤の平均粒径を２．５ｍｍよりも大きくする必要があった。しかし、上述したように、本発明者らは、袋体に冷媒用乾燥剤を充填したドライヤに冷媒用乾燥剤を使用する場合、冷凍サイクルシステムの冷媒液溜め容器内に冷媒用乾燥剤をそのまま充填していたときに要求されていた機械的強度まで冷媒用乾燥剤の機械的強度を向上させる必要がないことを見出したため、冷媒用乾燥剤の平均粒径を、２．５ｍｍ以下とすることができた。 When the refrigerant desiccant is filled in the refrigerant liquid storage container of the refrigeration cycle system as it is, a machine for preventing the refrigerant desiccant from cracking due to compression stress generated when the refrigerant desiccant is filled. In order to ensure the target strength, it is necessary to make the average particle size of the refrigerant desiccant larger than 2.5 mm. However, as described above, when using the desiccant for refrigerant in the dryer in which the bag body is filled with the desiccant for refrigerant, as described above, the desiccant for refrigerant in the refrigerant liquid storage container of the refrigeration cycle system is left as it is The average particle diameter of the refrigerant desiccant should be 2.5 mm or less, because it was found that there was no need to improve the mechanical strength of the refrigerant desiccant to the mechanical strength required when it was being filled. It was possible.
（粒径の範囲）
本発明の冷媒用乾燥剤の粒径の範囲は、０．５５ｍｍ以下であり、好ましくは０．４０ｍｍ以下であり、より好ましくは０．３０ｍｍ以下である。冷媒用乾燥剤の粒径の範囲が０．５５ｍｍよりも大きいと、冷媒用乾燥剤の耐摩耗性が悪くなる。なお、冷媒用乾燥剤の粒径の範囲とは、冷媒用乾燥剤の粒径の最大値を冷媒用乾燥剤の粒径の最小値で引き算した値である。また、本発明の冷媒用乾燥剤の粒径の範囲の下限値は、特に限定されないが、例えば、好ましくは０．１０ｍｍであり、より好ましくは０．２０ｍｍである。
(Range of particle size)
The range of the particle size of the desiccant for a refrigerant of the present invention is 0.55 mm or less, preferably 0.40 mm or less, and more preferably 0.30 mm or less. When the range of the particle size of the desiccant for refrigerant is larger than 0.55 mm, the abrasion resistance of the desiccant for refrigerant becomes worse. The range of the particle size of the desiccant for refrigerant is a value obtained by subtracting the maximum value of the particle size of the desiccant for refrigerant by the minimum value of the particle size of the desiccant for refrigerant. The lower limit of the range of the particle size of the refrigerant desiccant of the present invention is not particularly limited, but is preferably 0.10 mm, more preferably 0.20 mm.
冷媒用乾燥剤の耐摩耗性をさらに改善するという観点から、本発明の冷媒用乾燥剤の平均粒径は好ましくは１．０〜２．０ｍｍであり、より好ましくは１．２〜１．７ｍｍである。また、冷媒用乾燥剤の機械的強度をより高くするという観点から、本発明の冷媒用乾燥剤の冷媒用乾燥剤の平均粒径は好ましくは２．０〜２．５ｍｍである。 From the viewpoint of further improving the abrasion resistance of the refrigerant desiccant, the average particle diameter of the refrigerant desiccant of the present invention is preferably 1.0 to 2.0 mm, more preferably 1.2 to 1.7 mm. It is. Further, from the viewpoint of further increasing the mechanical strength of the desiccant for refrigerant, the average particle diameter of the desiccant for refrigerant of the desiccant for refrigerant of the present invention is preferably 2.0 to 2.5 mm.
上述したように、本発明の冷媒用乾燥剤は、転動式造粒法等の造粒法により作製することができる。本造粒法を使用すれば、造粒物の粒径を容易に制御できるとともに、形状や粒径の比較的そろった造粒物を作製することができる。したがって、上述の平均粒径や粒径の範囲を有する冷媒用乾燥剤を造粒法等の方法によって作製することは可能である。また、冷媒用乾燥剤を篩などで分級することによって、上述の平均粒径や粒径の範囲を有する冷媒用乾燥剤を作製してもよい。 As mentioned above, the desiccant for refrigerant | coolant of this invention can be produced by granulation methods, such as a rolling granulation method. By using the present granulation method, it is possible to easily control the particle size of the granulated product and to produce a granulated product having a relatively uniform shape and particle size. Therefore, it is possible to produce the desiccant for refrigerant | coolant which has the above-mentioned average particle diameter and the range of particle diameter by methods, such as the granulation method. Moreover, you may produce the desiccant for refrigerant | coolants which has the range of the above-mentioned average particle diameter or a particle size by classifying the desiccant for refrigerant | coolants with a sieve etc.
なお、市販されているビーズ形状の乾燥剤の粒径の範囲は、例えば、４×８のサイズのもの（４〜８Ｍｅｓｈ（Ｍｅｓｈ：ＡＳＴＭ規格））では約２．４ｍｍであり、８×１２のサイズのもの（８〜１２Ｍｅｓｈ（Ｍｅｓｈ：ＡＳＴＭ規格））では約０．７ｍｍであり、１６×３０のもの（１６〜３０Ｍｅｓｈ（Ｍｅｓｈ：ＡＳＴＭ規格））では約０．６ｍｍである。したがって、本発明の冷媒用乾燥剤の粒径の範囲は、市販されているものに比べると極めて狭いといえる。 The particle size of the commercially available bead-shaped desiccant is, for example, about 2.4 mm for 4 × 8 size (4 to 8 Mesh (Mesh: ASTM standard)), and 8 × 12 The size (about 8 to 12 mesh (Mesh: ASTM standard)) is about 0.7 mm, and the size of 16 × 30 (16 to 30 mesh (Mesh: ASTM standard)) is about 0.6 mm. Therefore, it can be said that the range of the particle size of the desiccant for refrigerants of the present invention is extremely narrow as compared to those commercially available.
（水分吸着能力）
本発明の冷媒用乾燥剤における６０℃の温度及び５０ｐｐｍの水分濃度の環境下における水分吸着能力は、好ましくは１０ｇ／１００ｇ以上であり、より好ましくは１４ｇ／１００ｇ以上であり、さらに好ましくは１５ｇ／１００ｇ以上である。冷媒用乾燥剤の水分吸着能力が１０ｇ／１００ｇ以上であると、冷媒から水分を十分に除去することができる。なお、６０℃の温度及び５０ｐｐｍの水分濃度の環境下における水分吸着能力は、以下のように測定する。
耐熱密閉容器の中に冷媒と冷媒用乾燥剤を入れ、さらに冷媒に対して５０質量ｐｐｍの水分を入れ、６０℃で２週間程度保持する。保持終了後、６０℃に加温した乾燥機の中で別のカラムに冷媒を分取する。分取した冷媒の重量（Ｗ１）を測定した後、この冷媒を全てカールフィッシャー装置に導入し、水分量（Ｗ２）を測定する。そして、式（１）より冷媒の水分量を計算する。
式（１）：冷媒の水分量（ｐｐｍ）＝Ｗ２／Ｗ１×１，０００，０００
次に冷媒用乾燥剤の重量（Ｗ３）を測定した後、冷媒用乾燥剤を水分気化装置で６００℃まで加熱することで冷媒用乾燥剤に吸着した水分を脱着し、窒素ガスとともに水分を捕集する。
これらを全てカールフィッシャー装置に導入し、水分量（Ｗ４）を測定する。そして、式（２）より冷媒用乾燥剤の水分量を計算する。そして、この冷媒用乾燥剤の水分量を冷媒用乾燥剤の水分吸着能力とする。
式（２）： 乾燥剤の水分量（ｇ／１００ｇ）＝Ｗ４／（Ｗ３−Ｗ４）×１００
(Water adsorption capacity)
The water adsorption capacity of the desiccant for a refrigerant of the present invention at a temperature of 60 ° C. and a water concentration of 50 ppm is preferably 10 g / 100 g or more, more preferably 14 g / 100 g or more, and still more preferably 15 g / g. It is 100g or more. When the water adsorption capacity of the refrigerant desiccant is 10 g / 100 g or more, water can be sufficiently removed from the refrigerant. The water adsorption capacity under the environment of a temperature of 60 ° C. and a water concentration of 50 ppm is measured as follows.
The refrigerant and the desiccant for refrigerant are placed in a heat-resistant closed container, and 50 mass ppm of water is further added to the refrigerant, and kept at 60 ° C. for about 2 weeks. After the holding, the refrigerant is separated into another column in a dryer heated to 60 ° C. After measuring the weight (W1) of the separated refrigerant, all the refrigerant is introduced into the Karl Fischer apparatus, and the water content (W2) is measured. Then, the moisture content of the refrigerant is calculated from equation (1).
Formula (1): Moisture content of refrigerant (ppm) = W2 / W1 × 1,000,000
Next, the weight (W3) of the refrigerant desiccant is measured, and the refrigerant desiccant is heated to 600 ° C. by the water vaporizer to desorb the water adsorbed to the refrigerant desiccant, thereby capturing the water together with the nitrogen gas. Collect.
All of them are introduced into a Karl Fischer apparatus, and the water content (W4) is measured. And the moisture content of the desiccant for refrigerant | coolants is calculated from Formula (2). And let the moisture content of this desiccant for refrigerant | coolant be the moisture adsorption capacity of the desiccant for refrigerant | coolant.
Formula (2): Moisture content of desiccant (g / 100 g) = W4 / (W3-W4) × 100
（冷媒用乾燥剤の材質）
本発明の冷媒用乾燥剤は、好ましくは親水性の合成ゼオライトの造粒物である。上記合成ゼオライトの細孔径は、対象とする冷媒の有効分子半径よりも小さいことが望ましく、その中でより水分吸着容量が高いゼオライトが好ましい。よって、有効分子半径が０．４ｎｍ未満の冷媒に対しては３Ａ型合成ゼオライトが好ましく、０．４ｎｍ以上０．９ｎｍ未満の冷媒に対しては４Ａ型合成ゼオライトが好ましく、０．９ｎｍ以上の冷媒に対しては１３Ｘ型合成ゼオライトが好ましい。なお、３Ａ型合成ゼオライトは、交換カチオンとしてＫ＋を有する立方晶系の合成ゼオライトであり、細孔径が約０．３ｎｍである。一方、４Ａ型合成ゼオライトは、交換カチオンとしてＮａ＋を有する立方晶系の合成ゼオライトであり、細孔径が約０．４ｎｍである。１３Ｘ型合成ゼオライトは、交換カチオンとしてＮａ＋を有する立方晶系の合成ゼオライトであり、細孔径が約０．９ｎｍである。
(Material of desiccant for refrigerant)
The desiccant for a refrigerant of the present invention is preferably a granulated product of a hydrophilic synthetic zeolite. The pore diameter of the synthetic zeolite is desirably smaller than the effective molecular radius of the target refrigerant, and among them, zeolite having a higher water adsorption capacity is preferable. Therefore, 3A-type synthetic zeolite is preferable for refrigerants having an effective molecular radius of less than 0.4 nm, and 4A-type synthetic zeolite is preferable for refrigerants of 0.4 nm or more and less than 0.9 nm, and 0.9 nm or more For these, 13X type synthetic zeolite is preferred. The 3A-type synthetic zeolite is a cubic synthetic zeolite having K + as an exchange cation, and has a pore diameter of about 0.3 nm. On the other hand, 4A-type synthetic zeolite is a cubic synthetic zeolite having Na + as an exchange cation, and has a pore diameter of about 0.4 nm. The 13X-type synthetic zeolite is a cubic synthetic zeolite having Na + as an exchange cation, and has a pore size of about 0.9 nm.
（冷媒）
本発明の冷媒用乾燥剤が使用される冷媒は、例えば、ハイドロフルオロカーボンであり、ハイドロフルオロカーボンとしては、例えば、１，１，１，２−テトラフルオロエタン（Ｒ１３４ａ）、ジフルオロメタン（Ｒ３２）、ペンタフルオロエタン（Ｒ１２５）、１，１，１−トリフルオロエタン（Ｒ１４３ａ）等が挙げられる。
(Refrigerant)
The refrigerant in which the refrigerant desiccant of the present invention is used is, for example, a hydrofluorocarbon, and as the hydrofluorocarbon, for example, 1,1,1,2-tetrafluoroethane (R134a), difluoromethane (R32), penta Fluoroethane (R125), 1,1,1-trifluoroethane (R143a), etc. are mentioned.
［ドライヤ］
本発明のドライヤは、本発明の冷媒用乾燥剤と、冷媒用乾燥剤を収容する袋体とを含む。これにより、ドライヤが外部から振動を受けても、ドライヤに含まれる冷媒用乾燥剤が摩耗することにより、発生した粉塵が袋体の通気性や通液性を悪くしたり、または、袋体から漏れ出してコンプレッサーの摺動面を損傷したり、膨張弁の細孔を閉塞させたりすることを抑制することができる。
[Dryer]
The dryer of the present invention includes the desiccant for refrigerant of the present invention and a bag containing the desiccant for refrigerant. As a result, even if the dryer receives vibration from the outside, the generated desiccant deteriorates the air permeability and liquid permeability of the bag body by abrasion of the refrigerant desiccant contained in the dryer, or from the bag body It is possible to prevent leakage and damage to the sliding surface of the compressor or blocking the pores of the expansion valve.
本発明のドライヤに用いる袋体としては、例えば、通液性及び通気性を有する、金網の袋、パンチメタルの袋、合成樹脂製のフェルト材の袋、合成樹脂製のメッシュ材の袋、不織布の袋及び織布の袋等が挙げられる。本発明のドライヤに用いる好ましい袋体は、不織布の袋である。 As a bag body used for the dryer of the present invention, for example, a bag of metal mesh, a bag of punched metal, a bag of felt made of synthetic resin, a bag of mesh made of synthetic resin, non-woven fabric having liquid permeability and air permeability. And bags of woven fabric and the like. A preferred bag for use in the dryer of the present invention is a non-woven bag.
以下、実施例に基づいて本発明を説明するが、本発明は実施例により制限されるものではない。 Hereinafter, the present invention will be described based on examples, but the present invention is not limited by the examples.
［実施例及び比較例の乾燥剤の評価］
実施例及び比較例の乾燥剤に対して以下の評価を実施した。
[Evaluation of Desiccant of Examples and Comparative Examples]
The following evaluation was implemented with respect to the desiccant of an Example and a comparative example.
（平均粒径）
試験用篩をロータップ試験機にセットし、採取した乾燥剤を篩い分けした。そして、各篩の網上残留分をパーセントで算出した。目開きの小さい篩から各篩の網上残留分を積算し、積算したパーセントが５０質量％となる篩の目開きを平均粒径とした。
(Average particle size)
The test sieve was set in a low tap tester, and the collected desiccant was sieved. And the remnant amount on the net of each sieve was calculated in percentage. The residual on the net of each sieve was integrated from the sieve with a small aperture, and the mesh diameter of the sieve which the integrated percentage becomes 50 mass% was made into the average particle diameter.
（粒径の範囲）
実施例及び比較例の乾燥剤調製に使用した標準篩の目開きの範囲を、粒径の範囲とした。
(Range of particle size)
The range of the openings of the standard sieves used for the preparation of the desiccant of the examples and comparative examples was taken as the range of the particle size.
（ダスト値）
一定量（５００ｍｌ）の乾燥剤を秤量し、光錯乱法ダストメーターにて試料投入口より試料を投入し、ブランクとの透過度の差をダスト値とした。
(Dust value)
A fixed amount (500 ml) of the desiccant was weighed, a sample was introduced from the sample inlet with a light scattering dust meter, and the difference in transmittance from the blank was taken as the dust value.
（摩耗減少量）
飽和吸湿させた実施例１〜５及び比較例１〜５の乾燥剤を秤量した（Ｗ５（ｇ））。次にガラス瓶にサンプルを充填し、イオン交換水をガラス瓶の首まで注ぎ、液が漏れないようにしっかり蓋をした。そのガラス瓶を振とう機にセットし振とうした。なお、振とうの回転数は７００±３０ｒｐｍ、振動時間は３０分とした。
振とう後、ガラス瓶を取り外し、水と一緒にサンプルを７μｍ目開きのろ紙フィルターを通して濾過、洗浄し、乾燥剤より発生した摩耗粉を含む濾液を予め秤量したビーカー（Ｗ６（ｇ））に採取した。次に２００℃の乾燥器で恒量になるまで、濾液を蒸発乾固した。ビーカーをデシケーター中で室温まで冷却した後、再度秤量した（Ｗ７（ｇ））。
次式（３）により摩耗減少量を算出した。
式（３）： 摩耗減少量（ｗｔ％）= {（Ｗ７−Ｗ６）／Ｗ５}×１００
なお、乾燥剤の摩耗減少量が小さいほど、その乾燥剤は摩耗していないことになるので、乾燥剤の摩耗減少量が小さいほど、その乾燥剤の耐摩耗性は高いことになる。
(Amount of wear reduction)
The desiccants of Examples 1 to 5 and Comparative Examples 1 to 5 saturated with moisture absorption were weighed (W5 (g)). Next, the glass bottle was filled with the sample, ion exchange water was poured to the neck of the glass bottle, and the lid was tightly closed so that the liquid would not leak. The glass bottle was set in a shaker and shaken. The rotation speed of shaking was 700 ± 30 rpm, and the vibration time was 30 minutes.
After shaking, the glass bottle was removed, the sample was washed with water through a 7 μm filter paper filter, washed, and the filtrate containing the abrasion powder generated from the desiccant was collected in a pre-weighed beaker (W6 (g)) . The filtrate was then evaporated to dryness to constant weight in a dryer at 200 ° C. After the beaker was cooled to room temperature in a desiccator, it was weighed again (W7 (g)).
The amount of wear reduction was calculated by the following equation (3).
Formula (3): Wear reduction amount (wt%) = {(W7-W6) / W5} x 100
The smaller the amount of decrease in the abrasion loss of the desiccant, the less the abrasion of the desiccant is. Therefore, the smaller the reduction in the amount of abrasion of the desiccant, the higher the abrasion resistance of the desiccant.
（機械的強度）
飽和吸湿させた実施例１〜５及び比較例１〜５の乾燥剤をそれぞれ２５粒選び、木屋式強度計にて機械的強度を測定した。１ｋｇ／秒の速度で荷重を掛け、乾燥剤が割れた荷重を記録した。
(Mechanical strength)
Twenty-five grains of each of the desiccants of Examples 1 to 5 and Comparative Examples 1 to 5 which had been saturated with moisture absorption were selected, and the mechanical strength was measured with a Kiya type intensity meter. The load was applied at a rate of 1 kg / s and the load at which the desiccant broke was recorded.
［実施例及び比較例の乾燥剤の作製］
実施例１〜５の乾燥剤及び比較例１〜５の乾燥剤を以下のようにして用意した。
[Preparation of Desiccant of Examples and Comparative Examples]
The desiccant of Examples 1-5 and the desiccant of Comparative Examples 1-5 were prepared as follows.
（実施例１）
標準篩＃１６（目開き１．１９ｍｍ）及び標準篩＃１２（目開き１．７０ｍｍ）を用いて、市販されているビーズ形状の３Ａ型合成ゼオライトを篩分し、標準篩＃１６と標準篩＃１２との間の３Ａ型合成ゼオライトを５００ｇ用意した。この３Ａ型合成ゼオライトを実施例１の乾燥剤とした。
（実施例２）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃１０（目開き２．００ｍｍ）及び標準篩＃８（目開き２．３８ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で実施例２の乾燥剤を用意した。
（実施例３）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃３０（目開き０．５９ｍｍ）及び標準篩＃２０（目開き０．８４ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で実施例３の乾燥剤を用意した。
（実施例４）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃１４（目開き１．４１ｍｍ）及び標準篩＃１２（目開き１．６８ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で実施例４の乾燥剤を用意した。
（実施例５）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃２０（目開き０．８４ｍｍ）及び標準篩＃１６（目開き１．１９ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で実施例５の乾燥剤を用意した。
Example 1
A commercially available bead-shaped 3A-type synthetic zeolite is sieved using standard sieve # 16 (mesh size 1.19 mm) and standard sieve # 12 (mesh size 1.70 mm), and standard sieve # 16 and standard sieve 500 g of type 3A synthetic zeolite between # 12 and # 12 was prepared. This 3A type synthetic zeolite was used as the desiccant of Example 1.
(Example 2)
Example 1 except using standard sieve # 10 (open 2.00 mm) and standard sieve # 8 (open 2.38 mm) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Example 2 was prepared in the same manner as in.
(Example 3)
Example 1 except using standard sieve # 30 (aperture 0.59 mm) and standard sieve # 20 (aperture 0.84 mm) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Example 3 was prepared in the same manner as in.
(Example 4)
Example 1 except using standard sieve # 14 (1.41 mm in mesh) and standard sieve # 12 (1.68 mm in mesh) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Example 4 was prepared in the same manner as in.
(Example 5)
Example 1 except using standard sieve # 20 (0.84 mm aperture) and standard sieve # 16 (1.19 mm aperture) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Example 5 was prepared in the same manner as in.
（比較例１）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃７０（目開き０．２１ｍｍ）及び標準篩＃２０（目開き０．８４ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で比較例１の乾燥剤を用意した。
（比較例２）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃８（目開き２．３８ｍｍ）及び標準篩＃７（目開き２．８３ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で比較例２の乾燥剤を用意した。
（比較例３）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃４０（目開き０．４２ｍｍ）及び標準篩＃２５（目開き０．７１ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で比較例３の乾燥剤を用意した。
（比較例４）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃８（目開き２．３８ｍｍ）及び標準篩＃７（目開き２．８３ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で比較例４の乾燥剤を用意した。
（比較例５）
標準篩＃１６及び標準篩＃１２の代わりに、標準篩＃１６（目開き１．１９ｍｍ）及び標準篩＃１０（目開き２．００ｍｍ）を用いて篩分を行った以外は、実施例１と同様な方法で比較例５の乾燥剤を用意した。
(Comparative example 1)
Example 1 except using standard sieve # 70 (0.21 mm mesh) and standard sieve # 20 (0.84 mm mesh) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Comparative Example 1 was prepared in the same manner as in the above.
(Comparative example 2)
Example 1 except that sieving was performed using standard sieve # 8 (2.38 mm aperture) and standard sieve # 7 (2.83 mm aperture) instead of standard sieve # 16 and standard sieve # 12. The desiccant of Comparative Example 2 was prepared in the same manner as in the above.
(Comparative example 3)
Example 1 was carried out except using standard sieve # 40 (opening 0.42 mm) and standard sieve # 25 (opening 0.71 mm) instead of standard sieve # 16 and standard sieve # 12. The desiccant of Comparative Example 3 was prepared in the same manner as in the above.
(Comparative example 4)
Example 1 except that sieving was performed using standard sieve # 8 (2.38 mm aperture) and standard sieve # 7 (2.83 mm aperture) instead of standard sieve # 16 and standard sieve # 12. The desiccant of Comparative Example 4 was prepared in the same manner as in the above.
(Comparative example 5)
Example 1 except using standard sieve # 16 (1.19 mm mesh) and standard sieve # 10 (2.00 mm mesh) instead of standard sieve # 16 and standard sieve # 12 The desiccant of Comparative Example 5 was prepared in the same manner as in the above.
［評価結果］
実施例１〜５及び比較例１〜５の乾燥剤の平均粒径、粒径の範囲、ダスト量、摩耗減少量及び機械的強度の評価結果を以下の表１に示す。
[Evaluation results]
The evaluation results of the average particle diameter, the range of particle diameter, the amount of dust, the amount of reduction in wear, and the mechanical strength of the desiccants of Examples 1 to 5 and Comparative Examples 1 to 5 are shown in Table 1 below.
図１に示すように、平均粒径が０．６〜２．５ｍｍの本発明の範囲とすることで、摩耗減少量を０．７（ｗｔ％）以下に抑制することができる。 As shown in FIG. 1, the wear reduction amount can be suppressed to 0.7 (wt%) or less by setting the average particle diameter in the range of 0.6 to 2.5 mm according to the present invention.
実施例１〜５及び比較例１〜５の結果より、乾燥剤の平均粒径が０．６〜２．５ｍｍであり、粒径の範囲が０．５５ｍｍ以下であると、ダスト量が小さく、摩耗減少量が小さく、冷媒用乾燥剤と冷媒用乾燥剤を収容する袋体とを含むドライヤとして使用するのに十分な機械的強度を有する乾燥剤を得られることがわかった。 From the results of Examples 1 to 5 and Comparative Examples 1 to 5, when the average particle diameter of the desiccant is 0.6 to 2.5 mm and the range of the particle diameter is 0.55 mm or less, the dust amount is small, It has been found that it is possible to obtain a desiccant which has a small amount of wear reduction and which has a mechanical strength sufficient for use as a dryer including a desiccant for refrigerant and a bag containing a desiccant for refrigerant.
本発明の冷媒用乾燥剤は耐摩耗性に優れ、充填時のダストや静電気の発生、乾燥剤の噛み込み、充填時の乾燥剤の摩耗等の種々のトラブルが低減されるため、袋体に冷媒用乾燥剤を充填する作業を自動で行う自動化対応にも好適である。 The desiccant for refrigerant of the present invention is excellent in abrasion resistance, and various problems such as generation of dust and static electricity at the time of filling, biting of the desiccant, abrasion of the desiccant at the time of filling and the like are reduced. It is suitable also for automation corresponding to the operation of automatically filling the refrigerant desiccant.
Claims (9)
平均粒径が０．６〜２．５ｍｍであり、
粒径の範囲が０．５５ｍｍ以下である冷媒用乾燥剤。 A particulate refrigerant desiccant for adsorbing moisture in refrigerant of a refrigeration cycle system, comprising:
The average particle size is 0.6 to 2.5 mm,
Desiccant for refrigerants having a particle size range of 0.55 mm or less.
粒径の範囲が０．２５〜０．５１ｍｍである請求項１に記載の冷媒用乾燥剤。 Average particle size is 0.7 to 2.2 mm,
The desiccant for refrigerant | coolant of Claim 1 which is a range of 0.25-0.51 mm of particle sizes.
該冷媒用乾燥剤を収容する袋体とを含むドライヤ。 The desiccant for refrigerant | coolant of any one of Claims 1-8,
And a bag containing the refrigerant desiccant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017215604A JP2019086236A (en) | 2017-11-08 | 2017-11-08 | Refrigerator desiccant and dryer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017215604A JP2019086236A (en) | 2017-11-08 | 2017-11-08 | Refrigerator desiccant and dryer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2019086236A true JP2019086236A (en) | 2019-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2017215604A Pending JP2019086236A (en) | 2017-11-08 | 2017-11-08 | Refrigerator desiccant and dryer |
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| Country | Link |
|---|---|
| JP (1) | JP2019086236A (en) |
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2017
- 2017-11-08 JP JP2017215604A patent/JP2019086236A/en active Pending
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