JP3409922B2 - Refrigeration equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression type refrigerating apparatus having an expansion mechanism portion in a refrigerant circulation path for maintaining a pressure difference between a compressor and a condenser and an evaporator.

[0002]

2. Description of the Related Art Generally, in a compression type refrigerating apparatus having a compressor, a condenser and an evaporator, a capillary tube (hereinafter referred to as "expansion mechanism") is used as an expansion mechanism for maintaining a pressure difference between a high pressure section (compressor, condenser) and a low pressure section (evaporator). , Simply referred to as a capillary) or an expansion valve. That is, in this capillary or expansion valve, the refrigerant liquefied by the condenser is depressurized.
The capillary is a thin tube having a diameter of 2 mm or less and a length of several 10 cm to 2 m. Further, a pipe having an inner diameter of 6 mm is usually used in front of the expansion mechanism in the flow direction of the refrigerant, and is connected to the condenser.

Further, as a constituent material of the refrigerant circulation path of the refrigerating apparatus, a conductor having good electric and thermal conductivity and excellent workability, for example, copper, iron or aluminum is often used. In particular, many copper pipes are used in the refrigerant circulation path other than the compressor, and copper is usually used in the piping from the condenser to the expansion mechanism.
Moreover, the whole is normally electrically grounded.

In such a refrigeration system, the refrigerant and the refrigerating machine oil circulate at high speed during operation.

By the way, the refrigerating apparatus contains a small amount of water, cleaning agent residue, rust inhibitor residue, etc. in addition to the refrigerant and the refrigerating machine oil. Copper dissolves. A part of the dissolved copper ions is converted into metallic copper again by the reducing action with the iron part of the compressor, etc., and fine copper particles are generated. Then, these copper fine particles adhere to the capillaries or the inner wall of the expansion valve while circulating in the refrigeration system. Since the capillaries are thin tubes with a diameter of 2 mm or less, even if the amount of copper fine particles that adhere and grow as described above is very small, it will cause a significant refrigerant flow resistance, reducing the circulation speed of the refrigerant and refrigerating machine oil, and reducing the entire refrigeration system. It becomes a factor that causes deterioration of the cooling capacity. Further, since the expansion valve opens and closes in accordance with the pressure difference, it is possible to deal with foreign matter adhesion to some extent, but since it is a thin portion, foreign matter adhesion is still not preferable.

[0006] Further, as the use of alternative CFCs and the change of refrigerating machine oil due to the use of CFCs are being promoted toward the complete abolition of CFCs, the residue of the solution such as the cutting oil used during the material processing of the refrigerating apparatus and the refrigerating machine oil are hydrated. The decomposed components may react with each other to generate organic foreign matter. When this foreign substance adheres to the capillary or the inner wall of the expansion valve, it may cause a refrigerant flow resistance and reduce the cooling capacity like the above-mentioned metallic copper particles.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and prevents deposits on the expansion mechanism,
An object of the present invention is to provide a refrigeration system capable of suppressing a decrease in the refrigerant flow rate in the expansion mechanism section.

[0008]

In order to achieve the above object, in a refrigerating apparatus according to the present invention, an expansion mechanism portion provided in a refrigerant circulation path for maintaining a pressure difference between a compressor and a condenser and an evaporator is provided. It is characterized in that it is electrically insulated from other parts constituting the refrigerant circulation path. Further, the other circulation path of the expansion mechanism section is preferably grounded. Further, the expansion mechanism section can be made of an electrically defective conductor.

Further, according to the present invention, in a refrigerating apparatus having an expansion mechanism portion in a refrigerant circulation path for maintaining a pressure difference between a compressor and a condenser, and an evaporator, an inner wall surface of an appropriately set portion of the refrigerant circulation path is It is characterized in that a capturing means for capturing a minute object generated in the refrigerant circulation path is provided.

The trapping means may be provided with an uneven portion, or gold, silver, platinum,
It is also possible to provide a portion containing at least one of the palladium. Further, it is preferable that the capturing means is provided in a refrigerant circulation path in the condenser or a refrigerant circulation path between the condenser and the expansion mechanism section. Further, as the capturing means, a portion containing at least one of gold, silver, platinum, and palladium may be provided in a bent portion in which the refrigerant circulation path is bent by 60 ° or more.

[0011]

The copper oxide on the surface of the copper tube, which is generally used in the refrigerant circulation path of the refrigerating machine, is dissolved during the operation of the refrigerating machine and is carried as copper ions together with the refrigerant and the refrigerating machine oil.
The copper ions are reduced to iron copper particles of the compressor and ferrous chloride (FeCl ₂ ) produced by dissolving iron with hydrochloric acid to form metallic copper fine particles. Immediately after reduction, the fine copper particles have an active surface and are easily attached to the metal, but they are slightly positively charged due to insufficient reduction and a partial reoxidation phenomenon, and are easily attached to lower potential portions. . On the other hand, when the refrigerant expands at high speed while expanding, the refrigerant is negatively charged and the expansion mechanism is positively charged. Therefore, if only the expansion mechanism is electrically insulated and the refrigeration system is operated, the expansion mechanism is kept at a positive potential, and the copper fine particles are difficult to adhere to the expansion mechanism, and adhere to parts other than the expansion mechanism. Therefore, it is possible to effectively suppress the decrease in the flow rate of the refrigerant in the expansion mechanism section. In addition, even if the copper fine particles adhere to a portion other than the expansion mechanism portion in this way,
Since the deposits are extremely small, if it is a pipe part with a diameter of 5 mm or more,
Even if it adheres to some extent, it causes almost no problem.

Further, by grounding the portion other than the expansion mechanism portion, the potential difference between the copper fine particles and the portion other than the expansion mechanism portion becomes larger, further promoting the adhesion of the copper fine particles to the portion other than the expansion mechanism portion. The generation of deposits on the expansion mechanism can be reduced, which is more effective.

Further, by subjecting the inner wall surface of the appropriately set portion of the refrigerant circulation path to uneven processing, the surface area of the processed uneven portion is increased, and contact with fine particles such as copper fine particles is prevented. Since opportunities are increased and it is possible to easily attach minute substances such as copper fine particles, it is possible to prevent the generation of the attached substances on the expansion mechanism section.

Further, by providing a portion containing at least one of gold, silver, platinum, and palladium, for example, by plating of these metals, etc. on the inner wall surface of an appropriately set portion of the refrigerant circulation path, the precious metal can be removed. Part not provided,
In particular, it is possible to suppress the adhesion of copper fine particles to the thin expansion mechanism section. That is, the copper fine particles generated by reduction as described above are rich in surface activity,
The copper refrigerant circulation path not provided with the noble metal is inferior in the bondability with the copper fine particles due to the surface being oxidized in the air, whereas the noble metal is difficult to be oxidized and the copper state is easily maintained as the copper fine particles. Easy to join. Therefore, the copper fine particles can be efficiently captured in the portion coated with the noble metal, and the adhesion to the expansion mechanism can be reduced.

Here, the concavo-convex portion itself and the deposits adhered to the concavo-convex portion or the portion containing the noble metal have little influence on the flow velocity of the refrigerant. In particular, even if an adhering substance is generated on the convex portion, this adhering substance only forms a part of the convex portion that works like a bank, and therefore has little influence on the flow velocity of the refrigerant.

Further, the uneven portion or the portion containing the noble metal usually has an inner diameter of about 6 mm and has an inner diameter considerably larger than that of the capillary portion. Since it is provided on the inner wall surface of the refrigerant circulation path, that is, the refrigerant circulation path in front of the capillary portion, it is possible to easily form the concave-convex portion and the portion containing the precious metal such as plating.

Further, by providing a portion containing at least one of gold, silver, platinum, and palladium in the bent portion where the refrigerant circulation path is bent by 60 ° or more, the flow of the refrigerant in the refrigerant circulation path can be improved. The direction is changed more than 60 degrees,
The copper fine particles collide with the inner wall surface of the bent portion where the noble metal is provided, and are captured more efficiently. That is, the flow velocity of the refrigerant is not so high in front of the expansion mechanism, but the collision velocity is increased by bending the passage so that the collision angle of the copper fine particles is 60 ° or more, preferably near 90 °, so that the copper fine particles are It can be captured efficiently.

[0018]

Embodiments of the present invention will be described below with reference to the drawings and tables.

[Embodiment 1] As shown in FIG. 1, a refrigerating apparatus 1 constituted by connecting a compressor 2, a condenser 4, a capillary portion 6, and an evaporator 8 was used. In addition, the arrow shown in FIG. 1 shows the flow direction of the refrigerant.

The capillary portion 6 has an inner diameter of 1.5 m.
As shown in FIG. 2, the copper pipe of m was connected to the copper pipes 10 and 12 on the respective sides of the condenser 4 and the evaporator 8.

This connection will be described in detail with reference to FIG. 3, which is an enlarged view of the connecting portion between the capillary portion 6 and the pipe 10 shown in FIG. The capillary portion 6 is provided with a nut 14, an O-ring 16, an insulating material 1 with respect to one end portion of the pipe 10 having a pipe diameter larger than the pipe diameter of the capillary portion 6.
8 to be electrically insulated. That is, the nut 14 connected to the end of the capillary portion 6 via the insulating material 18 was screwed into the portion threaded on the outer periphery of the end of the pipe 10 to make the connection. Where the nut 1
On the inner side of 4, an O-ring 16 is provided between the end of the pipe 10 on the side of the capillary 6 and the end of the capillary 6 on the side of the pipe 10. In this way, the pipe 10 and the capillary portion 6 are connected to each other while being electrically insulated and kept airtight. The capillary section 6 and the pipe 12
Since the connection part with is also connected as shown in Fig. 3,
Description of this part is omitted. In this way, the refrigerating device in which the capillary portion 6 is insulated is constructed.

In the refrigerating apparatus manufactured according to this Example 1, HCFC22 was used as a refrigerant, and naphthenic mineral oil (SUNISO 4GSD of Nippon San Oil Co., Ltd.) was used as a refrigerating machine oil while adding dilute hydrochloric acid to the refrigerating machine oil for acceleration. 5,
A driving experiment of 00 hours was conducted. Then, the change rate of the flow rate of the capillary portion after 500 hours was examined, the device was disassembled, and the state of copper fine particles adhering to the inner wall of the capillary portion was examined. The results are shown in Table 1. This Table 1 and Tables 2 and 3 given later
In the above, the change in the flow rate of the capillary portion represents the change rate of the value of the capillary flow rate after the operating time of 500 hours with respect to the initial value of the capillary flow rate, and the minus (-) shown in Table 1 indicates the decrease of the flow rate.

[Embodiment 2] A refrigerating apparatus was constructed in the same manner as in Embodiment 1 except that the portion other than the capillary portion 6 was grounded while the capillary portion 6 was insulated. Obtained. The results are shown in Table 1.

[Example 3] Experimental results were obtained in the same manner as in Example 2 except that alumina was used as the material of the capillary portion 6. However, unlike the first or second embodiment, the insulating material 18 was not used in the connection portion between the capillary portion 6 and the pipes 10 and 12. When the capillary part is made of alumina, the hardness of the capillary part is higher than that of copper, so
The position of the connecting portion with the pipes 10 and 12 was adjusted so as to draw a gentle arc. The results are shown in Table 1.

COMPARATIVE EXAMPLE 1 Except that the refrigeration system based on the conventional technique in which the capillary portion was connected by brazing and the capillary portion was electrically connected integrally with other portions, the refrigeration apparatus of the conventional technique was constructed. Experimental results were obtained in the same manner. The results are shown in Table 1.
Shown in.

[Embodiment 4] HFC134a as a refrigerant,
Experimental results were obtained in the same manner as in Example 2 except that a fatty acid ester oil was used as a refrigerator oil and water and triethanolamine were added for acceleration. The results are shown in Table 1.

[Comparative Example 2] HFC134a as a refrigerant,
Experimental results were obtained in the same manner as Comparative Example 1 except that a fatty acid ester oil was used as the refrigerator oil and water and triethanolamine were added for acceleration. The results are shown in Table 1.

[0028]

[Table 1] As is clear from the results shown in Table 1, by electrically insulating the capillary part from other parts (Example 1),
It can be seen that the adhesion of copper particles to the capillary portion can be significantly reduced and the decrease in the flow rate of the capillary can be significantly improved, as compared with the conventional technique (Comparative Example 1) in which insulation is not performed. In addition, it is better by electrically insulating the capillary portion and grounding the portion other than the capillary portion (Examples 2 and 4), or by configuring the capillary portion with alumina which is an electrically defective conductor (Example 3). The results were obtained. In addition, water and triethanolamine were added to the refrigerating machine oil, and HFC was used as a refrigerant.
134a, when a fatty acid ester oil is used as the refrigerating machine oil (Example 4), dilute hydrochloric acid is added to the refrigerating machine oil, and HCFC22 is used as the refrigerant, and mineral oil is used as the refrigerating machine oil (Examples 1 to 3). Good results have been obtained.

[Embodiment 5] In the refrigerating apparatus 1 shown in FIG. 1, on the inner wall surface of the refrigerant circulation path 22 having an inner diameter of 6 mm, which is provided upstream of the capillary portion 6, 10 from the front of the capillary portion are provided.
cm, so that the surface becomes rough as shown in FIG.
Concavo-convex processing was performed using a steel brush. After that, HCFC22 was used as a refrigerant, and naphthenic mineral oil (Suniso 4GSD) was used as a refrigerating machine oil, and an operation test for 800 hours was performed. Before and after the operation test, the change in the flow rate of the capillary portion described in Example 1 was examined, and after the operation test, the device was disassembled to examine the adhesion state to the inner wall of the capillary portion. The results are shown in Table 2.

[Embodiment 6] As shown in FIGS. 5, 6 and 7, on the inner wall surface of the refrigerant circulation path 22 at the same position as in Embodiment 5, the side surface and the refrigerant circulation are at a height of 0.6 mm. Route 22
Tests were performed in the same manner as in Example 5 except that triangular prism-shaped protrusions 24 that were in contact with the inner wall surface were formed at 20 locations at 15 mm intervals, and experimental results were obtained. The results are shown in Table 2.

Here, in the protruding portion 24, as shown in FIG. 7, a surface 24a which is located on the upstream side of the protruding portion 24 and is erected so as to be opposed to the direction of the flow of the refrigerant shown by the arrow in the figure. And the inner wall surface of the refrigerant circulation path 22 form an angle x of 90 °, and the inclination of the downstream side of the protrusion 24 shown by y in the figure is 40 degrees.
It is ゜.

The angle x does not have to be 90 °,
An angle of 30 ° or more and 90 ° or less and close to 90 ° is desirable.
If x is less than 30 °, the collision angle of foreign matter is small and it is difficult to adhere. The inclination y is preferably less than 90 °.

[Embodiment 7] A ring shape having a height of 0.5 mm is formed by cutting as shown in FIGS. 8 and 9 over the inner wall surface of the refrigerant circulation path 22 at the same position as in Embodiment 5 for 10 cm. A test was conducted in the same manner as in Example 5 except that the protrusions 26 were formed at intervals of 3 mm, and experimental results were obtained. The results are shown in Table 2.

[Embodiment 8] As shown in FIG. 10, a spiral recess 28 having a depth of 0.6 mm and a depth of 2 mm was formed on the inner wall surface of the refrigerant circulation path 22 at the same position as in Embodiment 5 for 10 cm.
Tests were conducted in the same manner as in Example 5 except that the layers were formed at intervals, and experimental results were obtained. The results are shown in Table 2.

[Comparative Example 3] A test was conducted in the same manner as in Example 5 except that a refrigerating apparatus in which no processing was performed was prepared in the refrigerant circulation path based on the conventional technique, measurement of flow rate change and capillary portion. The inner wall was observed. The results are shown in Table 2.

[0036]

[Table 2] As is clear from Table 2, no matter how the unevenness is processed,
As compared with Comparative Example 3, the amount of adhesion to the inner wall of the capillary portion could be greatly reduced, and the change in the flow rate of the capillary portion could be greatly improved.
In particular, in Example 5, the morphological observation of the uneven surface formed on the inner wall of the refrigerant circulation path was performed, but only a few μm of foreign matter was observed to be admitted at a thick place.

There is no particular limitation on the position where the concavo-convex process is performed. However, it is preferable to perform the concavo-convex process before the capillary part, and in this case, it is desirable to perform the process within 20 cm before the capillary part.

[Embodiment 9] In the refrigerating apparatus 1 shown in FIG. 1, a copper tube having an inner diameter of 1.5 mm is used as the capillary portion 6, and a copper tube having an inner diameter of 6 mm for connecting between the condenser 4 and the capillary portion 6. A part of the inner surface of the copper tube was plated with gold having a thickness of 1 μm along the length direction of the copper tube by 5 cm.
Gold plating was performed in an alkali cyanide bath. HC as refrigerant
FC22, naphthenic mineral oil as refrigerating machine oil (Suniso 4G
SD) was used, dilute hydrochloric acid was added to the refrigerating machine oil, and an operation test for 700 hours was performed. While checking the flow rate change of the capillary part before and after the operation test, after the operation test,
After dismantling, the state of foreign matter adhered to the inner wall of the capillary part was examined.
The results are shown in Table 3.

[Example 10] Experimental results were obtained in the same manner as in Example 9 except that silver was used instead of gold, and plating was performed in an alkali cyanide bath to a thickness of 3 to 6 µm. The results are shown in Table 3.

[Example 11] Experimental results were obtained in the same manner as in Example 9 except that platinum was used instead of gold, and plating was performed in a diamino platinum nitrite platinum bath to a thickness of 1 µm. The results are shown in Table 3.

[Example 12] Experimental results were obtained in the same manner as in Example 9 except that palladium was used instead of gold, and plating was performed in a diaminonitrite bath in a thickness of 1 µm. The results are shown in Table 3.

[Embodiment 13] A bent portion 34 bent at an angle of 80 ° is provided between the condenser 4 and the capillary portion 6 as shown in FIG. 11, and the inner surface of the bent portion 34 is plated with gold 32. Experimental results were obtained in the same manner as in Example 9 except that The results are shown in Table 3.

[Embodiment 14] HFC134 as a refrigerant
a, a fatty acid ester oil is used as the refrigerating machine oil, and as shown in FIG.
Experimental results were obtained in the same manner as in Example 9 except that the inner wall surface of the bent portion was plated with gold 38. The results are shown in Table 3.
Shown in.

[Comparative Example 4] Example 9 was repeated except that a refrigerating apparatus based on the conventional technique which was not plated at all was constructed.
Experimental results were obtained in the same manner as. The results are shown in Table 3.

[0045]

[Table 3] As is clear from Table 3, in any plating using noble metal (Examples 9 to 12), the amount of adhesion to the inner wall of the capillary portion can be significantly reduced as compared with Comparative Example 4, and the flow rate of the capillary portion changes. Was also greatly improved. The test results obtained by plating the bent portion (Example 14) were better than those obtained by plating the straight pipe portion. Also, in the test in which the U-shaped pipe portion of the capacitor was plated (Example 14), the same good results as those obtained by plating the linear pipe portion were obtained.

[0046]

As described above in detail, in the refrigerating apparatus according to the present invention, the expansion mechanism section is electrically insulated from the section other than the expansion mechanism section which constitutes the refrigerant circulation path. It is possible to prevent the copper fine particles generated in the circulation path from adhering to the expansion mechanism section, suppress the decrease in the refrigerant flow rate in the expansion mechanism section, and it is difficult for the performance of the refrigeration function to deteriorate even during long-term operation. can do.

Further, by grounding the refrigerant circulation path other than the insulated expansion mechanism part, it is possible to more reliably suppress the adhesion of the copper fine particles to the expansion mechanism part.

In addition, the inner wall surface of a portion of the refrigerant circulation path that is appropriately set is provided with an uneven portion, gold,
Since a trapping means composed of a portion containing at least one of silver, platinum, and palladium is provided so as to trap and adhere the fine particles generated in the refrigerant circulation path, fine particles such as copper fine particles to the expansion mechanism section. It is possible to prevent the adherence of the refrigerant and suppress the decrease in the flow rate of the refrigerant in the expansion mechanism section.

Further, the uneven portion or the portion containing the noble metal usually has an inner diameter of about 6 mm and has an inner diameter considerably larger than that of the capillary portion, or the inner wall surface of the refrigerant circulation path in the condenser, or between the condenser and the expansion mechanism portion. Since it is provided on the inner wall surface of the coolant circulation path, it is possible to easily perform the uneven processing and the formation of a portion containing a precious metal such as plating.

Further, the noble metal is provided in the copper fine particles by providing a portion containing at least one of gold, silver, platinum and palladium in a bent portion in which the refrigerant circulation path is bent by 60 ° or more. It collides with the inner wall surface of the bent portion and is more efficiently captured.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a refrigerating apparatus according to the present invention.

FIG. 2 is a diagram showing a connection between a capillary portion and other portions according to Examples 1 to 4 of the present invention.

FIG. 3 is a partially enlarged cross-sectional view of a connecting portion shown in FIG.

FIG. 4 is a partial cross-sectional view showing a concavo-convex surface provided in a refrigerant circulation path according to Embodiment 5 of the present invention.

FIG. 5 is a partial perspective view showing a protruding portion provided in a refrigerant circulation path according to Embodiment 6 of the present invention.

6 is a cross-sectional view of the refrigerant circulation path shown in FIG.

FIG. 7 is an enlarged explanatory view of a protrusion shown in FIG.

FIG. 8 is a partial cross-sectional view showing a protruding portion provided in a refrigerant circulation path according to Embodiment 7 of the present invention.

9 is a perspective view of the refrigerant circulation path shown in FIG. 8 taken along the arrangement direction thereof and cut at a central portion thereof.

FIG. 10 is a perspective view taken along a center portion of a refrigerant circulation path along a disposition direction of the refrigerant circulation path in order to show a protrusion provided in the refrigerant circulation path according to an eighth embodiment of the present invention.

FIG. 11 is a partial cross-sectional view showing a bent portion according to Embodiment 13 of the present invention.

FIG. 12 is a partial cross-sectional view showing a U-shaped tube according to Embodiment 14 of the present invention.

[Explanation of symbols]

2 compressor 4 evaporator 6 Capillary part 8 capacitors 10, 12 piping 14 nuts 16 O-ring 18 insulation 22 Refrigerant circulation path 24, 26, 28 Projection 32,38 gold plating 34 Bend 36 condenser U-tube

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakatsu Sato 1 Komukai Toshiba-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Research & Development Center Co., Ltd. (72) Inventor Katsu Hayashi Komukai-shi, Kawasaki-shi, Kanagawa 1 Incorporated Toshiba Research and Development Center (72) Inventor Shinichi Nakamura Komukai-cho, Komachi, Kawasaki-shi, Kanagawa 1 Incorporated Toshiba Research and Development Center (72) Inventor Motoo Yabuki Komukai, Kawasaki-shi, Kanagawa Toshiba Town 1 Co., Ltd. Toshiba Research & Development Center (72) Inventor Toshio Sakai 1 Komukai Toshiba Town, Komukai-ku, Kawasaki City, Kanagawa Prefecture Toshiba Research & Development Center (56) Reference JP-A-4-120187 (JP, A) ) JP-A 5-164434 (JP, A) JP-A 58-104478 (JP, A) JP-A 56-113967 (JP, A) JP-A 50-36388 (JP, A) Open 61-178169 (JP, U) Open 63-161013 (JP, U) Open 61-153877 (JP, U) Open 60-182679 (JP, U) Open 63-108058 ( JP, U) Actual Kaihei 3-105993 (JP, U) Actual public Sho 47-11959 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F25B 47/00 F25B 43/00 F25B 41/06

Claims (6)

(57) [Claims] And 1. A compressor, disposed in the refrigerant circulation path through the compressor
Bei a capacitor and an evaporator, and the condenser and the expansion mechanism part provided in the refrigerant circulation path in order to maintain the pressure difference between the evaporator
For example, the expansion mechanism part is partially electrically insulated constituting the refrigerant circulation path other than the expansion mechanism, the refrigerant circulating through
The refrigerating apparatus is characterized in that it is grounded except for the expansion mechanism section constituting the passage . 2. The refrigerating apparatus according to claim 1 , wherein the expansion mechanism section includes an electrically defective conductor. 3. A compressor and a refrigerant circulation path that passes through the compressor.
Bei a capacitor and an evaporator, and the condenser and the expansion mechanism part provided in the refrigerant circulation path in order to maintain the pressure difference between the evaporator
For example, the inner wall surface of a portion is appropriately set in the refrigerant circulation path, before
Adhering capture fine materials generated in serial the refrigerant circulation path
Contains at least one of gold, silver, platinum, and palladium
A refrigerating apparatus comprising a capture means having a hollow portion . 4. The refrigerating apparatus according to claim 3 , wherein the trapping unit has a portion on which uneven processing is performed. Wherein said trapping means is frozen according to claim 3 or 4, characterized in that provided a refrigerant circulation path in the capacitor, or from the condenser to the refrigerant circulation path between reaching the expansion mechanism section apparatus. 6. The capturing means is configured to connect the refrigerant circulation path to
The refrigerating apparatus according to claim 3, wherein the refrigerating apparatus is provided in a bent portion that is bent by 0 ° or more.