JPH10170504A - Measuring apparatus for contaminant in oil, and refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the accuracy and the convenience of such a measuring apparatus that quantitatively evaluates a contaminant dissolved in a refrigerator oil. SOLUTION: The inside of a system is vacuum-evacuated, a refrigerator oil, in which a contaminant is dissolved, is then poured into a sample container 11, and a refrigerant is poured into the sample container 11 while it is being pressurized or cooled. Then, a valve 15 and a valve 16 are opened, and the sample container 11, a filter holder 12 and a collection container 13 are connected directly. Then, when the collection container 13 is cooled by a cooling device 14, a mixed solution of the refrigerator oil and the refrigerant is passed through a filter inside the filter holder 12 so as to be collected in the collection container 13. On the basis of a change in the weight of the filter holder 12 or the filter held inside the filter holder 12 before and after a test, a contaminant which is precipitated in the mixed solution of the refrigerator oil and the refrigerant can be evaluated quantitatively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerating machine oil and a refrigerating cycle for a refrigerator, a home air conditioner, an automobile air conditioner, and the like.

[0002]

2. Description of the Related Art At present, replacement of refrigerant in a refrigeration cycle is being promoted from the viewpoint of protection of the ozone layer. In this process, when changing from a conventional chlorine-containing refrigerant to a chlorine-free hydrofluorocarbon (hereinafter referred to as HFC) -based alternative refrigerant, esters, ethers, and carbonates are mainly used to ensure compatibility with the refrigerant. Refrigeration oil is used.

However, long-chain fatty acids, fatty acid metal salts and the like, or oligomers of organic materials and rubbers, contained in piping processing oil and rust preventives, are somewhat present in refrigerating machine oils mainly composed of esters, ethers and carbonates. Dissolves but HF
The solubility of the C-based refrigerant in the condensate is very low.

Accordingly, in a compressor or the like of a refrigeration cycle where the temperature is relatively high, the above-mentioned fatty acids, fatty acid metal salts, oligomers and the like are dissolved in the refrigeration oil and circulated in the refrigeration cycle together with the refrigeration oil. There is a concern that the fatty acids, fatty acid metal salts, oligomers and the like may precipitate and contaminate the system in the condenser or the capillary portion which is an expanded pore, and in the worst case, block the cycle piping.

Therefore, in order to reduce or remove the contaminants such as the fatty acids, fatty acid metal salts, and oligomers contained in the compressor of the refrigeration cycle, etc. It has become important to quantitatively evaluate the dissolved contaminants, and the amount of the contaminants dissolved in the refrigerating machine oil has been evaluated using the degree of contamination or the degree of blockage of the inner wall of the refrigeration cycle piping.

[0006] Conventionally, the quantitative determination of contaminants in refrigerating machine oil has been performed using a measuring apparatus disclosed in Japanese Patent Application Laid-Open No. 8-136531, or a measuring method similar thereto.

Hereinafter, features of the conventional measuring device will be described. It has a high-pressure pump that sends the liquid phase of the sample container holding the mixed solution of the refrigerator oil and the refrigerant at a constant volume velocity,
A refrigerant is added to the refrigerating machine oil while pressurizing in the sample container to precipitate contaminants dissolved in the refrigerating machine oil. As a result, the liquid phase composed of the liquid refrigerant, the refrigerating machine oil, and the deposited contaminants is sent to the capillary by a high-pressure pump.

At this time, the pressure at the inlet side of the capillary is measured by a pressure gauge, and when the amount of contaminants attached to the capillary increases, the flow path resistance increases and the value of the pressure gauge increases. The amount of contaminants is evaluated based on the degree of the increase in pressure.

In this method, only the amount of contaminants precipitated when a refrigerant is added to the refrigerating machine oil is evaluated, and components that are still dissolved even after the addition of the refrigerant are not evaluated. This is because in the actual refrigeration cycle, the latter dissolved component has no actual harm to the dirt or blockage of the pipe, so it is more similar to the actual phenomenon to evaluate only the amount of contaminants precipitated when the refrigerant is added. It is because it is considered.

[0010]

However, in the above-mentioned conventional configuration, the degree of pressure increase varies depending on the distribution of the adhesion in the capillary, and the accuracy of quantification of contaminants dissolved in refrigerating machine oil cannot be sufficiently obtained. In addition, contaminants adhered to portions other than the capillaries, and it was necessary to clean or replace the device parts every measurement.

Therefore, it has been desired to accurately and simply measure the amount of contaminants dissolved in the refrigerating machine oil in a state where the contaminants are precipitated by condensation of the refrigerant. In addition, if a measuring device that is accurate and easily replaceable with a component can be mounted on an actual refrigeration cycle, maintenance time can be optimized in a large-sized air conditioner or the like.

An object of the present invention is to improve the accuracy and convenience of such a measuring device for quantitatively evaluating contaminants dissolved in refrigerating machine oil.

[0013]

Accordingly, a measuring device of the present invention is a measuring device for quantitatively evaluating a contaminant dissolved in refrigerating machine oil, comprising: a sample container for storing a mixed solution of refrigerating machine oil and refrigerant; It comprises a filter holder holding a filter inside and connected to the container, and a collection container connected to the filter holder.

According to the present invention, the contaminants are recovered on the filter by diluting the refrigerating machine oil in which the contaminants are dissolved with the refrigerant to precipitate the contaminants, and then filtering in a closed system. The accuracy of the measurement can be improved by directly quantifying the weight of the contaminant, and it can be reused only by replacing the filter or the filter holder, thereby improving the convenience of measurement.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a sample container for storing a mixed solution of refrigerating machine oil and a refrigerant, a filter holder holding a filter inside and connected to the container, This is a measuring device consisting of a collection container connected to a filter holder.After diluting the refrigerating machine oil in which the contaminant is dissolved with a refrigerant to precipitate the contaminant, the contaminant is filtered in a closed system and filtered. And the weight of the contaminant can be directly evaluated by measuring the weight of the filter or the filter holder before and after the test.

The invention according to claim 2 has a pore diameter of 0.1 to 0.1.
A 3 μm filter, a pair of metallic meshes installed to sandwich the filter, a seal ring that seals the flow path of the filter and is installed to sandwich the mesh, the filter, the mesh, and the 2. The measuring device according to claim 1, further comprising a filter holder comprising a pressure-resistant container holding the seal ring therein, wherein the filter has a separate weight to reduce the filter's own weight and more accurately perform quantitative evaluation of pollutants. It has the effect that it can be performed.

According to a third aspect of the present invention, there is provided a mesh-shaped synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body.
The measurement device according to claim 1, wherein a filter holder including the body and a pressure vessel made of a copper tube that holds the filter inside is provided, and the holding pores of the filter are simplified,
In addition, since the filter holder is made of a synthetic resin, the entire filtering unit can be reduced in weight and cost. As a result, by measuring the weight of the entire filtering unit, it is possible to quantitatively evaluate the contaminants, and to dispose the entire filtering unit to simplify the measurement.

According to a fourth aspect of the present invention, there is provided a net-like synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body,
The measurement device according to claim 1, wherein a filter holder including the body and a pressure vessel made of a copper tube that holds the filter inside is provided, and a holding mechanism of the filter is simplified.
In addition, since the filter and the filter holder have a tubular structure, the filter holder can be made of a copper tube, and the entire filtering unit can be reduced in weight and cost while maintaining high pressure resistance. As a result, it is possible to quantitatively evaluate the contaminants by measuring the weight of the entire filtering unit, to make the entire filtering unit disposable to simplify the measurement, and to use a refrigerant having a high condensing pressure. Having.

According to a fifth aspect of the present invention, a compressor, a condenser, a filter holder holding a filter therein and connected to the container, an expansion mechanism, and an evaporator are connected in a ring shape, A refrigeration cycle comprising a sight glass attached to a filter holder, a refrigerant mainly composed of hydrofluorocarbon, and a refrigerating machine oil which mutually dissolves in the refrigerant, and removes contaminants dissolved in the refrigerating machine oil with a filter. By observing the degree of contamination, the maintenance time of the refrigeration cycle can be optimized, and the effect of preventing contamination and blockage in the cycle piping can be obtained.

The invention according to claim 6 is characterized in that the pore size is 0.1 to 0.1.
A 3 μm filter, a pair of metal meshes installed to sandwich the filter, a seal ring sealed to seal the flow path of the filter and sandwich the mesh, the filter, the mesh and the The refrigeration cycle according to claim 5, further comprising a filter holder including a pressure-resistant container holding a seal ring therein and a sight glass attached to an inlet side of the pressure-resistant container, wherein contaminants dissolved in the refrigerating machine oil are removed. By observing the degree of contamination of the filter while removing it with a filter, the maintenance timing of the refrigeration cycle can be optimized and contamination and blockage in the cycle piping can be prevented.Maintenance can be achieved by using a separate filter. It has the effect of being cheap.

According to a seventh aspect of the present invention, there is provided a net-like synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body,
6. The refrigerating cycle according to claim 5, wherein a filter holder comprising a pressure vessel for holding the body and the filter inside, and a sight glass attached to an inlet side of the pressure vessel is disposed. By observing the degree of contamination of the filter while removing the contaminants with a filter, the maintenance time of the refrigeration cycle can be optimized, preventing contamination and blockage in the cycle piping, and making the filter three-dimensional by using a three-dimensional filter. Is increased to extend the life of the filter.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a cycle diagram of a measuring apparatus of the present invention for quantifying contaminants in refrigerating machine oil. In FIG. 1, 11 is a transparent sample container for holding a mixed solution of refrigerating machine oil and refrigerant, 12 is a filter holder for holding a filter (not shown) inside, and 13 is a collection for collecting a mixed solution that has passed through the filter holder 12. The container 14 is a cooling device for cooling the collection container 13.

Next, the operation will be described. After the inside of the system is evacuated, the refrigerating machine oil in which the contaminant is dissolved is injected into the sample container 11, and the refrigerant is injected into the sample container 11 while applying pressure or cooling. At this time, the injection amounts of the refrigerating machine oil and the refrigerant can be confirmed by estimating the volume (not shown) cut into the sample container.

When it is observed that the contaminants separated in the sample container 11 adhere or settle in the container, the mixed solution in the sample container 11 may be stirred using ultrasonic waves or the like.

Next, the valves 15 and 16 are opened, and the sample container 11, the filter holder 12, and the collection container 13 are directly connected.

When the collection container 13 is cooled by the cooling device 14, the evaporation pressure of the refrigerant in the collection container 13 becomes smaller than the evaporation pressure of the refrigerant in the sample container 11 due to the temperature difference between the sample container 11 and the collection container 13. Then, the mixed solution of the refrigerating machine oil and the refrigerant passes through the filter in the filter holder 12 and is collected in the collection container 13.

At this time, it is better to keep the sample container 11 and the filter holder 12 at room temperature and cool only the recovery container 13 so that the ratio of the refrigerating machine oil and the refrigerant in the mixed solution does not change as much as possible. Therefore, the sample container 11, the filter holder 12, and the collection container 13 need to have pressure resistance at least about the vapor pressure of the refrigerant at room temperature.

After a fixed amount of the mixed solution of the refrigerating machine oil and the refrigerant is collected in the collecting container 13, the valve 15 is closed, and the mixed solution remaining in the filter holder 12 is collected in the collecting container 13. Next, the valve 16 is closed and the filter holder 12 is separated from the apparatus. Then, from the weight change of the filter holder 12 or the filter held in the filter holder 12 before and after the test, the contaminants precipitated in the mixed solution of the refrigerating machine oil and the refrigerant can be quantified.

As described above, in the first embodiment, the weight of the contaminant dissolved in the refrigerating machine oil and precipitated when the refrigerant is mixed can be directly measured, and the measurement accuracy can be improved.

(Embodiment 2) FIG. 2 is a developed view of a filter holder used in the measuring apparatus of the present invention for quantifying contaminants in refrigerating machine oil. The configuration and operation of the measuring apparatus of the present invention are the same as those of the first embodiment shown in FIG. In FIG. 2, reference numeral 20 denotes a filter holder, 21 denotes a pore diameter of 0.3 μm.
The membrane filter 22 is a membrane filter 21
A pair of metal meshes for reinforcing the strength of the seal, a pair of seal rings for maintaining a pressure resistance in the flow path, 24 and 2
Reference numerals 5 and 26 denote an upper lid and a case a and a case b which form an outer box of the filter holder 20 as a set.

An o-ring 27 seals between the upper lid 24 and the case a 25, a sight glass 28 attached to the upper lid 24, a lid 29 for fixing the sight glass 28, 30
Is a connection port on the inlet side, and 31 is a connection port on the outlet side.

The outer case of the filter holder 20 is formed of an upper lid 24 and a pressure-resistant container of a case a25 and a case b26, and has a structure capable of withstanding the condensing pressure of the refrigerant, so that the liquid refrigerant can pass at room temperature.

Further, the membrane filter 21 has a fine structure with a pore diameter of 0.3 μm, and can filter almost all precipitates of contaminants contained in the refrigerating machine oil. It can withstand the differential pressure generated during filtration.

Further, one surface of the membrane filter 21 can be confirmed from the outside through the sight glass 28.

Next, the operation will be described. After measuring the weight of the membrane filter 21, the case a 25, the case b 26, and the lid 29 are tightened and sealed with the configuration shown in FIG. 2 to form the filter holder 20. Next, this filter holder 20 is mounted on the measuring device described in the first embodiment, and the mixed solution of the refrigerating machine oil and the refrigerant is allowed to pass therethrough.

At this time, when the mixed solution flows in from the connection port 30 and flows out from the connection port 31, contaminants adhere to the upper lid 24 side of the membrane filter 21 and are confirmed from outside through the sight glass 28. be able to. Then, from the weight change of the membrane filter 21 before and after the test, the contaminants precipitated in the mixed solution of the refrigerator oil and the refrigerant can be quantified.

As described above, in the second embodiment, the weight of contaminants dissolved in refrigerating machine oil and precipitated during mixing of a refrigerant can be directly measured.
The weight of the filter is small, and the quantitative evaluation of pollutants can be performed more precisely.

The filter holder according to the second embodiment uses a membrane filter having a pore diameter of 0.3 μm. However, in order to completely remove deposited contaminants, a pore diameter of 0.1 to 0.1 μm is used.
A 3.0 μm filter may be used. Pore diameter 0.1μ
If it is smaller than m, the filtration resistance may be excessive, and if it is larger than 3.0 μm, some contaminants may be permeated.

(Embodiment 3) FIG. 3 is a sectional view of a filter holder used in the measuring apparatus of the present invention for quantifying contaminants in refrigerating machine oil. The configuration and operation of the measuring apparatus of the present invention are the same as those of the first embodiment shown in FIG.

In FIG. 3, reference numeral 40 denotes a filter holder,
1 is a membrane filter having a pore diameter of 0.3 μm, 42 is a membrane filter 41 welded to the membrane filter 41.
A synthetic resin mesh that reinforces the strength of the mesh; 43, a lid that closes the flow path on the upper surface of the mesh 42; 44, a synthetic resin case; 45, an o-ring that seals the mesh 42 to the case 44; An inlet-side connection port 47 welded and connected to the case 44 is an outlet-side connection port formed by molding a part of the case 44.

Case 4 as an outer box of filter holder 40
Reference numeral 4 denotes a pressure-resistant container made of a synthetic resin, which has a structure capable of withstanding the condensing pressure of the refrigerant of 5 to 6 atm, and can pass the liquid refrigerant at room temperature.

Further, the membrane filter 41 has a fine structure with a pore diameter of 0.3 μm, can filter almost all precipitates of contaminants contained in the refrigerating machine oil, and is reinforced by a welded mesh 42. And can withstand the differential pressure generated during filtration.

Next, the operation will be described. A filter portion including a membrane filter 41, a mesh 42 and an o-ring 45 is inserted into a case 44 having a connection port 47 formed by injection molding, and fixed at a predetermined position. Next, the connection port 46 is welded to one end of the case 44 and connected.

After the weight of the filter holder 40 is measured, the filter holder 40 is mounted on the measuring device described in the first embodiment, and the mixed solution of the refrigerating machine oil and the refrigerant is allowed to pass therethrough. At this time, when the mixed solution flows in from the connection port 46 and flows out from the connection port 47, the contaminant adheres to the membrane filter 41.

Then, from the weight change of the filter holder 40 before and after the test, the contaminants precipitated in the mixed solution of the refrigerating machine oil and the refrigerant can be quantified.

As described above, in the third embodiment, the filter holding mechanism is simplified, and the filter holder is made of synthetic resin, so that the entire filtering unit can be reduced in weight and cost. As a result, by measuring the weight of the entire filtering unit, it is possible to quantitatively evaluate the pollutants,
The entire filtering unit can be disposable to simplify the measurement.

The filter holder according to the third embodiment uses a membrane filter having a pore diameter of 0.3 μm. However, in order to completely remove deposited contaminants, a pore diameter of 0.1 to 0.1 μm is used.
A 3.0 μm filter may be used. Pore diameter 0.1μ
If it is smaller than m, the filtration resistance may be excessive, and if it is larger than 3.0 μm, some contaminants may be permeated.

(Embodiment 4) FIG. 4 is a cross-sectional view of a filter holder used in the measuring device of the present invention for quantifying contaminants in refrigerating machine oil. The configuration and operation of the measuring apparatus of the present invention are the same as those of the first embodiment shown in FIG.

In FIG. 4, reference numeral 50 denotes a filter holder,
1 is a membrane filter having a pore diameter of 0.3 μm, and 52 is a membrane filter 51 welded to the membrane filter 51.
53 is a lid made of synthetic resin for reinforcing the strength of the mesh, 53 is a lid for closing the flow path on the upper surface of the mesh 52, 54 is a copper tube case, 5
5 is an o-ring that is fixed to the case 54 while sealing the mesh 52, 56 is a connection port on the inlet side connected to the case 54 by welding, and 57 is an outlet side formed by molding a part of the case 54. It is a connection port.

Case 5 which is an outer box of the filter holder 50
Reference numeral 4 denotes a pressure-resistant container made of a copper tube, which has a structure capable of withstanding the condensing pressure of the refrigerant of 20 to 30 atm, and can pass the liquid refrigerant at room temperature. Further, the membrane filter 51 has a fine structure with a pore diameter of 0.3 μm, is capable of filtering almost all precipitates of contaminants contained in the refrigerating machine oil, and is capable of filtering the deposited mesh 5.
2 to withstand the differential pressure generated during filtration.

Next, the operation will be described. A filter portion including a membrane filter 51, a mesh 52, and an o-ring 55 is inserted into a case 54 in which a connection port 57 is formed by drawing a copper tube, and fixed at a predetermined position. Next, the connection port 56 is connected to one end of the case 54 by welding.

After the weight of the filter holder 50 is measured, the filter holder 50 is mounted on the measuring device described in the first embodiment, and the mixed solution of the refrigerating machine oil and the refrigerant is allowed to pass therethrough. At this time, when the mixed solution flows in from the connection port 56 and flows out from the connection port 57, the contaminants adhere to the membrane filter 51. Then, from the weight change of the filter holder 50 before and after the test,
The contaminants precipitated in the mixed solution of the refrigerator oil and the refrigerant can be quantified.

As described above, in the fourth embodiment, the filter holding mechanism is simplified, and the filter holder and the filter holder are formed in a cylindrical structure, so that the filter holder can be made of a copper tube, and a high pressure resistance is achieved. The entire filtering unit can be made lightweight and inexpensive while maintaining it.

As a result, it is possible to quantitatively evaluate the pollutants by measuring the weight of the entire filtering section, to make the entire filtering section disposable and to simplify the measurement, and to use a refrigerant having a high condensing pressure. it can.

The filter holder according to the fourth embodiment uses a membrane filter having a pore diameter of 0.3 μm. However, in order to completely remove deposited contaminants, a pore diameter of 0.1 to 0.1 μm is used.
A 3.0 μm filter may be used. Pore diameter 0.1μ
If it is smaller than m, the filtration resistance may be excessive, and if it is larger than 3.0 μm, some contaminants may be permeated.

(Embodiment 5) FIG. 5 is a diagram of a refrigeration cycle of the present invention having a function of evaluating the amount of contaminants in refrigeration oil. In FIG. 5, 61 is a compressor, 62 is a condenser, 63 is a filter holder for holding a filter (not shown) inside, 64 is a sight glass mounted on the inlet side of the filter holder 63, and 65 is an expanded pore. A capillary 66 is an evaporator.

Next, the operation will be described. The refrigerant compressed by the compressor 61 condenses and liquefies while radiating heat in the condenser 62. This liquid refrigerant is filtered by the filter holder 63,
The pressure is reduced by the capillary 65. The decompressed liquid refrigerant evaporates and evaporates while absorbing heat in the evaporator 66 and returns to the compressor 61 again.

At this time, the refrigerating machine oil used for lubricating the mechanical part (not shown) of the compressor 61 includes a long-chain fatty acid or fatty acid metal salt contained in piping oil or a rust preventive, or an organic material. The contaminants such as rubber and rubber oligomer are dissolved and stay inside the compressor 61. A very small part of the refrigerating machine oil is discharged from the compressor 61 together with the refrigerant to lubricate the inside of the refrigerating cycle.

Then, a small amount of refrigerating machine oil and liquid refrigerant are mixed in the condenser 62, and contaminants dissolved in the refrigerating machine oil are deposited. The mixture of the mixed solution of the refrigerating machine oil and the liquid refrigerant and the contaminant is filtered by the filter holder 63, and only the mixed solution permeates.

The contaminants separated on the filter by the filter holder 63 can be observed on the sight glass 64. Therefore, even when the amount of contaminants contained in the refrigeration cycle is different or the amount of contaminants taken into the refrigerating machine oil changes depending on the operation state, the amount of contaminants separated on the filter cannot be constant. For example, maintenance such as filter replacement can be performed. In addition, the structure is such that contaminants do not easily deposit on the capillary 65 or the evaporator 66, so that maintenance can be simplified.

As described above, in the fifth embodiment, the maintenance time of the refrigeration cycle can be optimized by observing the degree of contamination of the filter while removing the contaminants dissolved in the refrigerating machine oil by the filter. Contamination and blockage can be prevented.

(Embodiment 6) FIG. 6 is a development view of a filter holder part of a refrigeration cycle of the present invention having a function of evaluating the amount of contaminants in refrigeration oil. The configuration and operation of the refrigeration cycle of the present invention are the same as those of the fifth embodiment shown in FIG.

In FIG. 6, 70 is a filter holder, 7
1 is a membrane filter having a pore diameter of 0.3 μm, 72 is a pair of metal meshes for reinforcing the strength of the membrane filter 71, 73 is a pair of seal rings for maintaining pressure resistance in the flow path, and 74, 75, and 76 are one pair. An upper cover and a case a, a case b,
77 is an o-ring for sealing between the upper lid 74 and the case a75, 78 is a sight glass attached to the upper lid 74, 7
9 is a lid for fixing the sight glass 78, 80 is a connection port on the entrance side, and 81 is a connection port on the exit side.

The outer box of the filter holder 70 is formed of a pressure-resistant container having an upper lid 74 and a case a75 and a case b76, and has a structure that can withstand the condensation pressure of the refrigerant, and can pass the liquid refrigerant at room temperature.

The membrane filter 71 has a fine structure with a pore diameter of 0.3 μm, and can filter out almost all the precipitates of contaminants contained in the refrigerating machine oil. It can withstand the differential pressure generated during filtration. In addition, one surface of the membrane filter 71 can be confirmed from the outside through the sight glass 78.

The next operation will be described. After measuring the weight of the membrane filter 71, the case a75, the case b76, and the lid 79 are tightened and sealed with the configuration shown in FIG.

Next, the filter holder 70 is mounted on the refrigeration cycle described in the fifth embodiment and operated. At this time, when the mixed solution flows in from the connection port 80 and flows out from the connection port 81, the contaminant adheres to the upper lid 74 of the membrane filter 71 and can be observed from the outside through the sight glass 78.

Therefore, even when the amount of contaminants contained in the refrigeration cycle is different or when the amount of contaminants taken into the refrigerating machine oil changes depending on the operation state, the amount of contaminants separated on the filter is constant. When the amount becomes sufficient, maintenance such as filter replacement can be performed.

Further, the structure is such that contaminants do not easily accumulate on the capillary 65 or the evaporator 66, so that maintenance can be simplified. Further, by measuring the weight of the membrane filter 71 collected during maintenance, contaminants can be quantified and abnormal phenomena can be identified.

As described above, in the sixth embodiment, by observing the degree of fouling of the filter while removing the contaminants dissolved in the refrigerating machine oil by the filter, the maintenance time of the refrigerating cycle can be optimized and the cycle time in the cycle piping can be improved. Pollution and blockage can be prevented, and abnormal phenomena can be identified by quantifying contaminants.

Although the filter holder according to the sixth embodiment uses a membrane filter having a pore diameter of 0.3 μm, a pore diameter of 0.1 to 0.1 μm is required to completely remove deposited contaminants.
A 3.0 μm filter may be used. Pore diameter 0.1μ
If it is smaller than m, the filtration resistance may be excessive, and if it is larger than 3.0 μm, some contaminants may be permeated.

(Embodiment 7) FIG. 7 is a sectional view of a filter holder part of a refrigeration cycle of the present invention having a function of evaluating the amount of contaminants in refrigeration oil. The configuration and operation of the refrigeration cycle of the present invention, except for the filter holder,
Since this is the same as Embodiment 5 shown in FIG. 5, the description will be omitted.

In FIG. 7, reference numeral 90 denotes a filter holder;
1 is a membrane filter having a pore diameter of 0.3 μm, 92 is a membrane filter 91 welded to a membrane filter 91.
A mesh made of a synthetic resin for reinforcing the strength of the filter, 93 is a lid for closing the flow path on the lower surface of the mesh 92, 94 and 95 are a pair of cases a and b forming an outer box of the filter holder 90, and 96 is a case a94. A seal ring 97 seals between the case b95, 97 is a sight glass attached to the case b95, 98 is a lid for fixing the sight glass 97, 99 is a connection port on the inlet side, and 100 is a connection port on the outlet side.

The case a94 and the case b95 are fastened by bolts (not shown), and have a structure that withstands the condensing pressure of the refrigerant, so that the liquid refrigerant can pass at room temperature. The membrane filter 91 has a pore diameter of 0.3 μm.
And can filter out almost all the precipitates of contaminants contained in the refrigerating machine oil, and can withstand the differential pressure generated at the time of filtration by being reinforced by the welded mesh 92.

Further, the mesh 92 is screwed and fixed to the case a94, and the differential pressure generated at the time of filtration can be sealed by the screw portion. Further, the outer peripheral surface of the membrane filter 91 can be confirmed from the outside through the sight glass 97.

Next, the operation will be described. After measuring the weight of the membrane filter 91, the membrane filter 91 is fixed in the filter holder 90 with the configuration shown in FIG. 7, and the filter holder 90 is mounted on the refrigeration cycle described in the fifth embodiment for operation. At this time, when the mixed solution flows in from the connection port 99 and flows out from the connection port 100, the contaminant adheres to the upper cover on the outer peripheral surface of the membrane filter 81 and can be observed from the outside through the sight glass 97.

Therefore, even when the amount of contaminants contained in the refrigeration cycle is different or the amount of contaminants taken into the refrigerating machine oil changes depending on the operation state, the amount of contaminants separated on the filter is constant. When the amount becomes sufficient, maintenance such as filter replacement can be performed. In addition, the structure is such that contaminants do not easily deposit on the capillary 65 or the evaporator 66, so that maintenance can be simplified.

Further, if the weight of the membrane filter 91 collected during maintenance is measured, contaminants can be quantified, and the abnormal state can be determined. Further, by making the membrane filter 91 have a three-dimensional structure, the surface area can be increased, and the life can be extended.

In the seventh embodiment, as in the case of an abnormality, the maintenance time of the refrigeration cycle can be optimized by observing the degree of contamination of the filter while removing the contaminants dissolved in the refrigerating machine oil by the filter. Pollution and blockage can be prevented, and abnormal phenomena can be identified by quantifying contaminants. Further, the life of the filter can be extended by forming the filter into a three-dimensional structure.

The filter holder of the seventh embodiment uses a membrane filter having a pore diameter of 0.3 μm. However, in order to completely remove the deposited contaminants, a pore diameter of 0.1 to 0.1 μm is used.
A 3.0 μm filter may be used. Pore diameter 0.1μ
If it is smaller than m, the filtration resistance may be excessive, and if it is larger than 3.0 μm, some contaminants may be permeated.

[0081]

As described above, according to the present invention, the contaminants are filtered on the filter by diluting the refrigerating machine oil in which the contaminants are dissolved with the refrigerant to precipitate the contaminants, and filtering in a closed system. In this way, the weight of the contaminant can be directly quantified to improve the accuracy, and the filter can be reused only by replacing the filter or the filter holder, thereby improving the convenience of measurement. Further, by installing the filter holder in an actual refrigeration cycle and observing the contaminants collected on the filter, an effect is obtained that the maintenance time can be optimized in a large-sized air conditioner or the like.

[Brief description of the drawings]

FIG. 1 is a cycle diagram of a measuring device according to a first embodiment of the present invention.

FIG. 2 is an exploded view of a filter holder of the measuring device according to the second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a filter holder of a measuring device according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a filter holder of a measuring device according to a fourth embodiment of the present invention.

FIG. 5 is a diagram of a refrigeration cycle showing a fifth embodiment of the present invention.

FIG. 6 is an exploded view of a filter holder part of a refrigeration cycle showing a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a filter holder of a refrigeration cycle according to a sixth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Sample container 12 Filter holder 13 Recovery container 20 Filter holder 21 Membrane filter 22 Mesh 61 Compressor 62 Condenser 63 Filter holder 64 Sight glass 65 Capillary 66 Evaporator

Claims (7)

[Claims] 1. A measuring device for quantitatively evaluating a contaminant dissolved in a refrigerating machine oil, comprising: a sample container for storing a mixed solution of a refrigerating machine oil and a refrigerant; and a filter inside which is connected to the container. A measuring device comprising a filter holder and a collection container connected to the filter holder. 2. A filter having a pore diameter of 0.1 to 3 μm, a pair of metal meshes provided so as to sandwich the filter, and a filter arranged to seal the inside of the flow path of the filter and sandwich the mesh. The measurement device according to claim 1, further comprising a filter holder including a seal ring, and a pressure-resistant container that holds the filter, the mesh, and the seal ring therein. 3. A mesh-shaped synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body, and holding the body and the filter inside. 2. A measuring apparatus according to claim 1, further comprising a filter holder comprising a pressure-resistant container made of synthetic resin. 4. A cylindrical synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body, and holding the body and the filter inside. 2. The measuring apparatus according to claim 1, further comprising a filter holder comprising a pressure vessel made of a copper pipe. 5. A site attached to the filter holder, wherein the compressor, the condenser, the filter holder holding the filter therein and connected to the container, the expansion pores, and the evaporator are connected in a ring shape. A refrigeration cycle comprising a glass, a refrigerant mainly composed of hydrofluorocarbon, and a refrigerating machine oil mutually soluble in the refrigerant. 6. A filter having a pore diameter of 0.1 to 3 μm, a pair of metal meshes provided so as to sandwich the filter, and a filter arranged to seal the inside of a flow path of the filter and sandwich the mesh. 6. The refrigeration cycle according to claim 5, further comprising a filter ring comprising a seal ring, a pressure-resistant container holding the filter, the mesh, and the seal ring therein, and a sight glass attached to an inlet side of the pressure-resistant container. . 7. A mesh-shaped synthetic resin body molded into a cylindrical shape, a filter having a pore diameter of 0.1 to 3 μm welded to an outer peripheral surface of the body, and the body and the filter are held inside. 6. The refrigeration cycle according to claim 5, further comprising a filter holder including a pressure vessel to be used and a sight glass attached to an inlet side of the pressure vessel.