JPH074789A - Filter for removing impurity refrigerating cycle using refrigerant of hfc series - Google Patents

Abstract

PURPOSE:To adsorb and remove foreign materials and thereby to enable stable operation of a refrigerating cycle for a long period by constructing integrally a baked material of which the main constituent is activated carbon and a baked material of which the main constituents are activated alumina and synthetic zeolite. CONSTITUTION:A structure body 2 which is prepared by sintering activated carbon by using an appropriate binder and of which the gas permeation resistance is small and a structure body 3 which is prepared by sintering a mixture of activated alumina and synthetic zeolite by using an appropriate binder and of which the gas permeation resistance is small are combined with each other properly and they are provided in a refrigerating cycle by using components such as steel cases 4 and 5. As the result, contamination constituents produced from friction and abrasion of sliding components at the time of the use of a lubricating oil of ester series in a refrigerating cycle can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impurity removal filter in a refrigeration cycle using an HFC refrigerant (a chlorofluorocarbon called "new alternative substance"). The present invention relates to an impurity removal filter that adsorbs and removes foreign matter generated due to friction and wear of sliding parts inside a compressor and enables stable operation of a refrigeration cycle over a long period of time.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a refrigeration cycle. 11 is a compressor, 12 is a condenser, 13 is a dryer, 14 is a filter containing activated carbon, 15 is an expansion valve, 16 is an evaporator,
17 is an accumulator. The arrow indicates the flow direction of the refrigerant. The refrigeration cycle using CFC refrigerant (specified CFC) has a history of about 30 years, and efforts have been made to improve it to the high quality level of today's reliability, durability, etc., but HFC refrigerant is used. The refrigeration cycle described above has a problem that the lubricity tends to be lower than that of a refrigeration cycle using a conventional CFC or HCFC refrigerant (designated CFC), which is a problem.

The problems that are likely to occur in the refrigeration system include increased friction and wear in the compressor, increased oil temperature,
There is a rise in discharge temperature, accumulation of dirt components, poor heat dissipation in the condenser, vibration in the dryer, insufficient strength due to an increase in the amount of water adsorbed, precipitation of fatty acid iron salts in the expansion valve, precipitation of dirt components, and in the evaporator. Deposition of dirt components of the assembly processing oil, deposition of elution components of organic materials, and deposition of elution components (oligomer components) of organic materials in the return pipe. Measures to prevent these are to improve the lubricity by changing the lubricating oil and sliding material, to grasp the control limit of the operating temperature of the refrigeration cycle, to control the contamination components (purity, moisture, solvent, assembly processing oil, Oxygen, elution components of organic materials, stability of oil additives, etc.) and wear powder of the desiccant itself causes wear of sliding parts, so the strength of the desiccant is controlled, but sufficient effect I couldn't name it.

There are various possible causes for this, but the ester-based lubricating oil used in combination with the HFC-based refrigerant is not sufficiently effective as an extreme pressure agent, and friction and friction of sliding parts inside the compressor are
The temperature tends to rise due to abrasion, sludge components (dust) are likely to occur due to abrasion, and the chlorine component and iron oxide tend to decompose them. Less hydrolyzable than conventional ester-based lubricating oil, high lubricity, and economical economical lubricating oil has not yet been obtained. It is a major problem to suppress friction and wear of sliding parts when using ester-based lubricating oil to reduce temperature rise, suppress generation of sludge component due to wear, and remove chlorine component. In order to minimize these problems, the filter 14 made of a sintered body of activated carbon having the structure shown in FIG. 2 is arranged in the refrigeration cycle using the HFC refrigerant. 2 is a sintered body of activated carbon, 4 and 5 are steel cases, 6 is a leaf spring, 7 is a SPCC material, 8 is a heat resistant adhesive,
Reference numeral 9 is a wire net, and 10 is a packing made of glass wool / alumina wool. The arrow indicates the flow direction of the refrigerant.

[0005]

However, in the conventional filter, in the durability evaluation of the refrigeration cycle using the HFC refrigerant, a deposit such as a fluctuation of the flow resistance is generated at the outlet side of the capillary tube, and the HFC system is used. It has been found that the function as an impurity removal filter in the refrigeration cycle using a refrigerant is not sufficient. As a result of the component evaluation of the deposit, metal soap, insoluble component of rust preventive agent, polymerized component of ester oil, abrasion powder generated by friction and abrasion of sliding parts, extract of organic material, etc. were detected. Therefore, in order to stably operate the refrigeration cycle for a long period of time, deposits that cause fluctuations in the flow resistance at the outlet side of the capillary tube are prevented in advance, and these sources are reduced, and the generated components are eliminated. Must be removed sufficiently. INDUSTRIAL APPLICABILITY The present invention, when installed and used in a refrigeration cycle, adsorbs and removes foreign matter generated due to friction and wear of sliding parts inside a compressor and operates the refrigeration cycle stably for a long time. An object of the present invention is to provide an impurity removal filter that enables the following.

[0006]

Means for Solving the Problems As a result of repeated studies to solve the above problems, the present inventors have found that a fired product containing activated carbon as a main component and a fired product containing activated alumina and synthetic zeolite as a main component. It has been found that the above problems can be solved by using a filter having a simple structure integrally configured, and the present invention has been completed.

The invention according to claim 1 of the present invention is a calcined product containing activated carbon as a main component and a calcined product containing active alumina and synthetic zeolite as main components, which are used by being arranged in a refrigeration cycle using an HFC refrigerant. It is a filter for removing impurities in a refrigeration cycle using an HFC-based refrigerant, which is characterized in that

The invention according to claim 2 of the present invention is characterized in that a calcined product containing activated carbon as a main component and a calcined product containing activated alumina and synthetic zeolite as a main component are integrally molded. Is a filter for removing impurities in the refrigeration cycle using the HFC refrigerant.

[0009]

1 is a cross-sectional explanatory view of an impurity removing filter 1 showing an example of the present invention. 2 is a sintered body of activated carbon, 3 is a fired body containing activated alumina and synthetic zeolite as main components, 4 and 5 are steel cases, 6 is a leaf spring, and 7 is SPC.
C material, 8 is a heat resistant adhesive, 9 is a wire mesh (net), and 10 is a packing made of glass wool / alumina wool. The arrow indicates the flow direction of the refrigerant.

The impurity removing filter 1 is composed of a structure 3 having a low gas permeation resistance obtained by sintering a mixture of activated alumina and synthetic zeolite with a suitable binder, and a gas permeation resistance obtained by sintering activated carbon with an appropriate binder. Although it has a configuration in which a small number of structures 2 are appropriately combined,
As another embodiment of the impurity removal filter 1 of the present invention, there can be mentioned one having a structure having a low gas permeation resistance, which is obtained by sintering a mixture of activated carbon, activated alumina and synthetic zeolite using a suitable binder.

The activated carbon, activated alumina, synthetic zeolite, binder and the like used in the present invention are not particularly limited, and for example, commercially available ones can be used in appropriate combination.

By installing the impurity removal filter 1 of the present invention in a refrigeration cycle using an HFC refrigerant and using it as an auxiliary component for ensuring the durability of the refrigeration cycle, a small amount of chlorine component remaining during component cleaning is adsorbed. Can be removed. A small amount of rust preventive agent component remaining during parts cleaning, which is not a problem because it dissolves in conventional CFC and HCFC lubricating oils, is accumulated on the low temperature side of the refrigeration cycle and in the part where the flow rate of the refrigerant has decreased, It becomes a flow resistance, and ultimately it can prevent falling into poor cooling. Polymerization products generated by friction and wear of sliding parts inside the compressor can be adsorbed and removed. The fluctuation of the flow resistance of the capillary tube can be controlled to the minimum. It is economical because it is a filter with a simple structure integrally formed in one case. As a result, it becomes possible to stably operate the HFC-based refrigerant use refrigeration cycle for a long period of time.

[0013]

EXAMPLES Hereinafter, the contents of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these contents. (Manufacturing Example of Impurity Removal Filter of the Present Invention) (A) (Manufacture of Fired Product Containing Activated Carbon as Main Component) (1) Activated carbon having a mesh of 30 to 60 is used, and an inert gas component which does not lead to environmental destruction, For example, carbon dioxide, HFC134a, etc. are preferably adsorbed in advance to lose the activity. In addition, activated carbon before activation may be used. (2) There are various types of binders such as organic materials and inorganic materials. As an example, an example of using an organic material will be given. Removal filters can be manufactured. As the organic binder, a material having HFC resistance is preferable, and examples thereof include epoxyphenol-modified varnish, phenolepoxy-modified varnish, and acrylic varnish. When the binder is mixed with activated carbon and molded, the tackiness (including thixotropy) of the binder has a great influence on the workability, and therefore the binder is preferably selected and used in consideration of the workability as well. The binder concentration with respect to the activated carbon is not particularly limited, but it is preferable to use a solid content of about 20 to 30% by weight.

(3) Inactive activated carbon and varnish are mixed and the surface of the activated carbon is coated with varnish. (4) Next, this mixture is put into a mold and molded by a press molding machine. The press molding is to reduce the pressure loss when used as an impurity removal filter as much as possible, and to remove the impurities (core, shape, size,
It is important to optimize so that the structure) can be obtained. The pressure loss during the refrigeration cycle was reduced to 0.
It is preferable to control it to 05 kg / mm ² or less.

(5) After that, baking and dehydration treatments are performed. If the calcination is carried out all at once at the calcination temperature, the sticking strength may be significantly reduced. Therefore, for example, it is preferable to gradually increase the temperature from a low temperature to evaporate the solvent and perform the calcination as described below. It should be noted that if the air is trapped during the treatment at a low temperature, the activated carbon will burn and the sticking force tends to decrease. 120 ° C x 1hr, 140 ° C x 1hr, 150 ° C x 3h
r, 170 ° C. × 3 hr. In this process, by releasing an inert gas such as carbon dioxide adsorbed on the activated carbon, cracks are generated in the varnish film coated on the surface of the activated carbon, and activation is performed without lowering the adsorption performance of the activated carbon. be able to.

(B) (Production of Fired Product Containing Activated Alumina and Synthetic Zeolite) The fired product containing activated alumina and synthetic zeolite as a main component has been used for about 25 years. The outline of the manufacturing process is shown. (1) Activated alumina and synthetic zeolite (for example, molecular sieve) having 30 to 60 mesh are used. (2) For example, 7 parts by weight of activated alumina, 3 parts by weight of synthetic zeolite, and a polymerized aluminum phosphate-based binder are mixed in an appropriate ratio of about 20 to 30% by weight. (3) Next, this mixture is put into a mold and molded by a press molding machine. The above-mentioned caution is necessary for press molding. (4) After that, baking and dehydration treatments are performed. As for the firing conditions, the above cautions are necessary.

(C) Using the thus-produced fired product containing activated carbon as a main component and the fired product containing activated alumina and synthetic zeolite as a main component, as shown in FIG.
The impurities removal filter of the present invention was made using parts such as steel cases 4 and 5. As a result of arranging and using this impurity removal filter in the refrigeration cycle using the HFC-based refrigerant shown in FIG. 3, it was possible to operate stably for a long period of time.

[0018]

EFFECT OF THE INVENTION The present invention comprises removal of impurities in a refrigeration cycle using an HFC-based refrigerant, which is characterized by comprising a calcined product containing activated carbon as a main component and a calcined product containing activated alumina and synthetic zeolite as a main component. It is a filter that can be used by arranging it in the refrigeration cycle to reduce the contamination components generated from friction and wear of the sliding parts when using ester-based lubricating oil in the refrigeration cycle. Abrasion can be reduced, the generation of polymer components of metallic soap and ester oil can be suppressed, and adsorption can be removed
Adsorbs and removes organic material extracts, adsorbs and removes insoluble components such as rust preventives for assembled processed parts, reduces the flow rate / damage relationship of the desiccant, and wears sliding parts due to desiccant wear powder Therefore, the refrigeration cycle can be stably operated over a long period of time. The impurity removal filter of the present invention is economical because it has a simple structure, and has high industrial utility value because it has a large effect as described above.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of an impurity removal filter of the present invention.

FIG. 2 is a cross-sectional explanatory view of a conventional impurity removal filter.

FIG. 3 is an explanatory diagram of a refrigeration cycle.

[Explanation of symbols]

1 Impurity Removal Filter 2 Sintered Body of Activated Carbon 3 Fired Body Consisting of Activated Alumina and Synthetic Zeolite 4, 5 Steel Case 6 Leaf Spring 7 SPCC Material 8 Heat Resistant Adhesive 9 Wire Mesh 10 Packing 11 Compressor 12 Condenser 13 Dryer 14 Activated carbon filter 15 Expansion valve 16 Evaporator 17 Accumulator

Claims (2)

[Claims] 1. A fired product containing activated carbon as a main component and a fired product containing active alumina and synthetic zeolite as main components, which are used by being arranged in a refrigeration cycle using an HFC-based refrigerant. Characteristic filter for removing impurities in refrigeration cycle using HFC refrigerant. 2. The HF according to claim 1, wherein the fired product containing activated carbon as a main component and the fired product containing activated alumina and synthetic zeolite as a main component are integrally molded.
Impurity removal filter in refrigeration cycle using C refrigerant.